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Glass cutting machines come in three main types: glass cutting production lines, glass cutting and loading integrated machines, and glass cutting tables.Glass cutting production lines are highly automated systems, capable of handling large - scale production tasks. They integrate multiple processes including glass feeding, cutting, and sometimes even edge - processing, enabling continuous and efficient operation, which is ideal for mass - production factories.Glass cutting and loading integrated machines combine the functions of glass loading and cutting. They can automatically pick up glass sheets from the storage area and perform cutting operations, reducing labor intensity and improving production efficiency. These machines are suitable for medium - sized enterprises that aim to enhance automation while saving space.Glass cutting tables are more basic and flexible tools. They are usually semi - automated or manually operated, mainly providing a stable platform for cutting glass. They are cost - effective and easy to operate, making them a good choice for small - scale workshops or for handling small - batch, customized cutting tasks.

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The first critical step in molecular sieve processing is creating precise access points for filler injection—without compromising the structural integrity of the target component (e.g., hollow glass aluminum spacers, adsorption towers, or catalyst reactors). The all-in-one automatic filler’s punching module is engineered to address this challenge through advanced mechanical design and intelligent control systems.Unlike manual punching, which often results in irregular hole sizes, burr formation, or material deformation, the automated punching mechanism leverages servo-driven actuators and precision tooling to deliver consistent, repeatable results. For instance, in hollow glass production, the system targets aluminum spacers (6–24mm in width) with punch diameters calibrated to match molecular sieve particle sizes (0.5–0.8mm), ensuring unobstructed filler flow while minimizing post-processing debris. The punching process is synchronized with component positioning systems, which use optical sensors to align the punch with pre-programmed coordinates—eliminating human error and ensuring hole placement accuracy within ±0.1mm.Notably, the module’s adaptability is a key strength. It accommodates diverse component geometries, from straight aluminum strips to custom-bent frames (square, rectangular,弓形, or rounded-corner designs) and cylindrical adsorption towers, making it suitable for multiple industrial sectors . Advanced models also feature adjustable punch depth and force control, preventing material damage while maintaining structural integrity—a critical consideration for thin-walled components or high-pressure applications like gas separation reactors.

Glass Tempering Furnace: Principles, Technology, Applications and Industrial Development

Abstract

Glass tempering furnace, as a core thermal processing equipment in the modern glass deep-processing industry, plays an irreplaceable role in transforming ordinary float glass, sheet glass and other flat glass products into tempered glass with high mechanical strength, thermal stability and safety performance. This paper systematically elaborates on the fundamental working principles, structural composition, classification characteristics, processing technology, application scenarios, performance advantages and existing challenges of glass tempering furnaces. Combined with the latest technological innovations and market development trends in the global glass industry, it also prospects the future development direction of glass tempering furnace equipment, aiming to provide a comprehensive and in-depth reference for industrial practitioners, engineering technicians and relevant research scholars.

1. Introduction

With the rapid advancement of global construction, automotive, home appliance, electronic information and new energy industries, the demand for high-performance safety glass has shown a sustained growth trend. Tempered glass, known as "safety glass", has become one of the most widely used functional glass products in modern industrial and civil fields due to its outstanding characteristics such as 3-5 times higher impact resistance than ordinary glass, excellent thermal shock resistance, and harmless small granular fragments when broken. The core equipment for achieving the glass tempering process is the glass tempering furnace, which integrates multiple disciplines including mechanical engineering, thermal engineering, automation control, material science and electrical engineering.

Since the birth of the first industrialized glass tempering furnace in the mid-20th century, the equipment has undergone continuous technological iteration and structural optimization. From the initial vertical tempering furnaces to the widely used horizontal convection tempering furnaces today, and from the single small-scale processing equipment to the large-scale, intelligent, energy-saving and high-efficiency production lines, glass tempering furnaces have gradually evolved into a highly specialized and standardized industrial equipment category. In the global glass deep-processing industry chain, the performance level of glass tempering furnaces directly determines the quality, production efficiency and cost control of tempered glass products, and is a key link that affects the core competitiveness of glass processing enterprises. This paper will conduct an all-round and multi-angle analysis of glass tempering furnaces, starting from their basic theoretical basis, and extending to practical applications and future development.

2. Fundamental Principles of Glass Tempering

Before analyzing the structure and working process of glass tempering furnaces, it is essential to clarify the physical and chemical principles behind the glass tempering process, which is the theoretical cornerstone for the design and operation of glass tempering furnaces. Glass tempering, also referred to as glass toughening, is a physical heat treatment method that changes the internal stress state and mechanical properties of glass without altering its chemical composition.

2.1 Thermal Tempering Principle

The vast majority of commercial glass tempering furnaces adopt the thermal tempering process, whose core principle is based on the rapid cooling of heated glass to form a uniform compressive stress layer on the surface and a tensile stress layer inside the glass. Specifically, ordinary flat glass is heated in a tempering furnace to a temperature close to its softening point (generally between 600°C and 650°C, varying slightly with glass composition and thickness), at which the glass internal molecular structure is in a state of high activity and the internal stress is completely eliminated. Subsequently, the heated glass is quickly transferred to the cooling zone of the tempering furnace, where high-speed and uniform cold air is blown onto both sides of the glass surface through a specially designed air grid system.

Due to the rapid cooling rate, the glass surface layer solidifies and contracts first, forming a rigid compressive stress layer, while the internal glass is still in a high-temperature plastic state and continues to cool and contract. As the internal glass gradually cools to room temperature, its shrinkage is constrained by the already solidified surface layer, resulting in a stable tensile stress inside the glass and a compressive stress on the surface. This stress distribution endows tempered glass with exceptional mechanical properties: when subjected to external impact or bending force, the surface compressive stress can offset most of the external tensile stress, significantly improving the glass's impact resistance and bending strength. Moreover, when the tempered glass is broken by an external force exceeding its bearing limit, the internal tensile stress is released instantaneously, causing the glass to break into numerous small obtuse-angle particles, avoiding sharp fragments that cause harm to the human body, thus achieving the safety performance of tempered glass.

2.2 Chemical Tempering Principle

In addition to thermal tempering, a small number of special glass tempering furnaces adopt the chemical tempering process, which is mainly applicable to thin glass (thickness <3mm) and special-shaped glass products that are not suitable for thermal tempering. The chemical tempering principle is to immerse the preheated glass in a molten salt bath containing alkali metal ions with a larger ionic radius at a temperature lower than the glass transition temperature, and realize the ion exchange between the glass surface and the molten salt through the diffusion of alkali metal ions in the glass network structure. For example, sodium ions (Na⁺) on the glass surface are replaced by potassium ions (K⁺) with a larger radius in the molten salt. The volume expansion caused by ion substitution forms a compressive stress layer on the glass surface, thereby improving the mechanical strength and thermal stability of the glass. Although chemical tempering has advantages in processing thin glass, its production cycle is long, the cost is high, and the compressive stress layer is relatively thin, so it is only used in specific industrial fields, and thermal tempering furnaces still dominate the mainstream market.

3. Structural Composition of Glass Tempering Furnace

A complete glass tempering furnace is a complex integrated system composed of multiple functional modules, each module cooperating closely to complete the continuous and stable tempering processing of glass. The typical horizontal glass tempering furnace, which is the most widely used in the industry, mainly includes the feeding system, heating furnace body, conveying system, cooling system, control system and auxiliary systems such as exhaust and dust removal. Each part has a clear functional positioning and precise design requirements.

3.1 Feeding System

The feeding system is the starting end of the glass tempering furnace, responsible for stably and accurately sending the original glass sheets to be processed into the heating furnace. It mainly consists of a loading table, a sheet separating device, a positioning mechanism and a conveying roller table. For automated production lines, the feeding system is often equipped with a robotic arm loading system, which can realize automatic sorting, positioning and feeding of glass sheets, reducing manual labor and improving production efficiency. The positioning mechanism ensures that each glass sheet enters the heating furnace at a fixed position and angle, avoiding deflection or overlapping that affects the heating uniformity. For large-format glass, the feeding system is designed with anti-deformation support structures to prevent the glass from bending or breaking during the feeding process due to its own weight.

3.2 Heating Furnace Body

The heating furnace body is the core component of the glass tempering furnace, where the glass is heated to the specified tempering temperature, and its performance directly determines the heating efficiency and temperature uniformity of the glass. The heating furnace body is generally a sealed box structure, composed of a furnace shell, a thermal insulation layer, a heating element, a temperature sensor and a furnace inner cavity.

The furnace shell is usually made of high-strength steel plates, with good structural rigidity to ensure the stability of the furnace body during long-term operation. The thermal insulation layer is filled with high-temperature resistant thermal insulation materials such as aluminum silicate fiber and ceramic fiber, which can effectively reduce heat loss, reduce energy consumption and ensure the temperature stability of the furnace inner cavity. The heating element is the heat source of the furnace body, mainly including resistance heating wires, ceramic heating plates and infrared radiation heating tubes. According to different heating methods, it can be divided into radiation heating and convection heating. Traditional tempering furnaces mainly adopt radiation heating, which relies on the infrared radiation emitted by the heating element to heat the glass; modern high-efficiency tempering furnaces add a forced convection system, which circulates the high-temperature gas in the furnace through a convection fan to achieve uniform heating of the glass surface, especially suitable for low-e coated glass and other coated glass products that are sensitive to temperature differences.

Temperature sensors (such as thermocouples) are evenly arranged in the furnace body to collect real-time temperature data of different zones in the furnace, and feed back to the control system to realize closed-loop control of the furnace temperature, ensuring that the temperature difference in the effective heating area is controlled within ±2°C, which is a prerequisite for ensuring the quality of tempered glass. In addition, the heating furnace body is divided into multiple independent temperature control zones according to the length and width, and the temperature of each zone can be adjusted independently to adapt to the heating requirements of glass with different thicknesses and sizes.

3.3 Conveying System

The conveying system runs through the entire glass tempering furnace, responsible for transporting the glass through the feeding area, heating area and cooling area at a controllable speed. It mainly adopts a ceramic roller conveying structure, because ceramic rollers have excellent high-temperature resistance, low thermal expansion coefficient and smooth surface, which will not scratch the glass surface and can maintain stable conveying performance at high temperatures up to 700°C.

The ceramic rollers are driven by a motor and a transmission system (such as a chain or a synchronous belt), and the conveying speed can be adjusted steplessly through the control system. For glass with different thicknesses, the conveying speed in the heating zone and the cooling zone is precisely matched: thicker glass requires a slower conveying speed in the heating zone to ensure sufficient heating time, while thinner glass needs a faster conveying speed to avoid overheating. In addition, the conveying system of high-end tempering furnaces is equipped with a roller speed synchronization control device to ensure that the glass is always in a horizontal and stable state during the conveying process, avoiding deflection or warping caused by inconsistent roller speeds.

3.4 Cooling System

The cooling system is the key module to realize the rapid cooling of the heated glass and form the internal stress of tempered glass, which is composed of an air compressor, an air storage tank, an air grid assembly and an air volume adjustment device. The air grid is the core component of the cooling system, which is divided into upper and lower air grids, arranged symmetrically on the upper and lower sides of the glass conveying path. The surface of the air grid is densely distributed with specially designed air nozzles, which can spray high-pressure and uniform cold air onto the glass surface.

The cooling system of a high-performance glass tempering furnace can realize stepless adjustment of air volume, air pressure and cooling speed according to the thickness, size and type of glass. For example, thick glass requires a relatively gentle cooling rate to avoid excessive temperature stress causing glass bursting, while thin glass needs a higher cooling rate to ensure the formation of effective compressive stress. In addition, the cooling system is equipped with an air circulation and filtration device, which can recycle the cold air after heat exchange, reduce the load of the air compressor and achieve energy saving. The uniformity of the air grid air supply is a key indicator to measure the performance of the cooling system, and uneven air supply will lead to uneven stress distribution of the tempered glass, resulting in quality problems such as glass warping, self-explosion and poor strength.

3.5 Automatic Control System

The automatic control system is the "brain" of the glass tempering furnace, integrating programmable logic controller (PLC), human-machine interface (HMI), temperature control module, speed control module and safety protection module. The control system realizes the automatic operation of the entire tempering process by presetting process parameters for different types of glass.

Operators only need to input glass parameters such as thickness, size and type on the human-machine interface, and the system will automatically match the optimal heating temperature, heating time, conveying speed, cooling air volume and other process parameters. The control system has functions such as real-time data monitoring, fault alarm, parameter storage and historical data query. It can monitor the operating status of each module of the furnace body in real time, and issue an alarm and take protective measures in time when abnormal conditions such as temperature overrun, roller jam, and air pressure abnormality occur. In addition, the intelligent control system of modern glass tempering furnaces is equipped with a network communication interface, which can realize remote monitoring, fault diagnosis and program upgrade, facilitating the management and maintenance of the production line by enterprises.

3.6 Auxiliary Systems

In addition to the above core modules, the glass tempering furnace is also equipped with a series of auxiliary systems to ensure the stable operation of the equipment and compliance with environmental protection requirements. The exhaust gas treatment system is used to discharge the volatile gas and dust generated during the glass heating process, and purify the exhaust gas to meet environmental protection standards; the dust removal system collects the glass dust and impurities generated during the feeding and conveying process to keep the inside of the furnace clean; the cooling water circulation system is used to cool the motor, transmission system and electrical components of the equipment to prevent overheating damage; the safety protection system includes emergency stop buttons, safety doors, temperature and pressure overload protection, etc., to ensure the personal safety of operators and the safety of equipment.

4. Classification of Glass Tempering Furnaces

Glass tempering furnaces can be classified from multiple perspectives according to different structural forms, processing technologies, application scenarios and automation levels. The classification is conducive to the selection and application of equipment in different industrial fields. The main classification methods are as follows:

4.1 Classification by Structural Form

According to the conveying and processing structure, glass tempering furnaces are mainly divided into horizontal glass tempering furnaces and vertical glass tempering furnaces. Horizontal glass tempering furnaces adopt a horizontal conveying method, with glass lying flat on the ceramic roller table for heating and cooling. They have the advantages of large processing format, high production efficiency, good glass flatness, and suitability for mass production of various flat glass. They are the most widely used type in the market, covering almost all fields of tempered glass production. Vertical glass tempering furnaces adopt a vertical hanging conveying method, with glass vertically suspended and sent into the furnace for processing. They have a small floor area and are suitable for processing small and medium-sized glass and special-shaped glass, but their production efficiency is low and the processing format is limited, so they are only used in a small number of special processing scenarios.

4.2 Classification by Heating Method

According to the heating method of the furnace body, glass tempering furnaces are divided into radiation heating tempering furnaces and convection heating tempering furnaces. Radiation heating tempering furnaces rely on the infrared radiation of heating elements to heat glass, with a simple structure and low cost, suitable for processing ordinary clear float glass. However, the heating uniformity is relatively poor, and it is easy to cause uneven heating of coated glass, resulting in quality defects. Convection heating tempering furnaces add a forced convection circulation system on the basis of radiation heating, which uses high-temperature hot air to convectively heat the glass surface, greatly improving the heating uniformity and heating speed. They are especially suitable for processing low-e coated glass, solar coated glass, colored glass and other special glass products, and have become the mainstream development trend of modern tempering furnaces.

4.3 Classification by Processing Capacity and Scale

According to the processing capacity and production scale, glass tempering furnaces are divided into small and medium-sized laboratory tempering furnaces, medium-sized industrial production tempering furnaces and large-scale continuous production tempering furnaces. Small and medium-sized laboratory tempering furnaces are mainly used for glass tempering process research, product development and small-batch sample production, with small processing format, low power and flexible operation. Medium-sized industrial production tempering furnaces are suitable for small and medium-sized glass processing enterprises, with moderate processing capacity and cost, meeting the production needs of conventional tempered glass products. Large-scale continuous production tempering furnaces are designed for large glass processing groups, with ultra-large processing format, high-speed continuous production capacity, high degree of automation and intelligent integration, and can realize 24-hour uninterrupted production, suitable for large-scale orders in construction, automotive and other industries.

4.4 Classification by Process Purpose

According to different process purposes and processed glass types, glass tempering furnaces are also divided into flat glass tempering furnaces, bent glass tempering furnaces, laminated glass supporting tempering furnaces, and ultra-thin glass tempering furnaces. Among them, the bent glass tempering furnace is equipped with a bending mold and a bending control system in the heating zone, which can heat and bend the glass while tempering, producing curved tempered glass for automotive windshields, architectural curved curtain walls and other fields.

5. Glass Tempering Process Flow

The complete glass tempering process realized by the glass tempering furnace is a standardized and continuous operation flow, and each process link must be strictly controlled to ensure the quality of tempered glass. The standard process flow of the horizontal thermal glass tempering furnace is as follows:

5.1 Original Glass Preparation

Before entering the tempering furnace, the original glass sheets need to be cut, edged, polished and cleaned. Cutting is to cut the large-format original glass into the required size according to the design requirements; edging and polishing are to remove the sharp edges and burrs generated during cutting, because the micro-cracks on the glass edge will become the stress concentration point during the tempering process, leading to glass bursting; cleaning is to remove the oil, dust and impurities on the glass surface through a glass cleaning machine, avoiding the formation of spots or defects on the glass surface during heating and affecting the appearance quality of tempered glass.

5.2 Automatic Feeding

The cleaned and inspected qualified glass sheets are placed on the feeding table of the tempering furnace, and the feeding system positions and separates the glass sheets, then sends them into the heating furnace body one by one through the conveying roller table at a set speed. For automated production lines, this process is completed by a robotic arm without manual intervention.

5.3 High-Temperature Heating

The glass enters the heating furnace body and is conveyed forward slowly through the ceramic roller table. The heating element and convection system in the furnace heat the glass uniformly, and the temperature is raised to the tempering temperature (600-650°C) and maintained for a certain period of time. The heating time is determined by the glass thickness, type and furnace temperature: the thicker the glass, the longer the heating time required to ensure that the glass internal temperature reaches the softening state and the internal stress is completely eliminated. During the heating process, the control system monitors the furnace temperature in real time and adjusts the heating power to ensure temperature uniformity.

5.4 Rapid Cooling (Tempering)

After the heating is completed, the glass is quickly conveyed from the heating furnace to the cooling zone. The upper and lower air grids of the cooling system spray high-pressure uniform cold air onto the glass surface instantly, realizing rapid and uniform cooling. The cooling speed is precisely controlled according to the glass thickness, forming a stable compressive stress layer on the glass surface and a tensile stress layer inside, completing the tempering process. This link is the most critical step in determining the performance of tempered glass, and any deviation in cooling speed or uniformity will lead to unqualified product quality.

5.5 Unloading and Quality Inspection

The tempered glass after cooling is conveyed to the unloading table by the conveying system, and the operator or automatic inspection equipment conducts quality inspection on the tempered glass. The inspection items include appearance quality (no scratches, spots, bubbles, etc.), dimensional accuracy, flatness, stress distribution, and impact resistance. Qualified products are packaged and stored, while unqualified products are screened out for reprocessing or scrap treatment.

6. Application Fields of Tempered Glass Produced by Tempering Furnaces

Tempered glass produced by professional glass tempering furnaces has excellent performance and is widely used in various fields of the national economy, covering construction, automotive, home appliances, electronics, new energy, aerospace and other industries, and its application scope is still expanding with the development of technology.

6.1 Architectural Decoration Field

The architectural field is the largest consumer market for tempered glass. Tempered glass is widely used in building curtain walls, interior partition walls, doors and windows, shower rooms, floor glass, railings and ceilings. In high-rise buildings, tempered glass curtain walls not only have a beautiful and modern appearance, but also can withstand strong wind pressure and external impact, ensuring the safety of the building. In interior decoration, tempered glass partitions and doors and windows have good light transmittance and safety performance, improving the space utilization rate and aesthetic feeling of the building. In addition, laminated tempered glass and insulating tempered glass processed on the basis of tempered glass are also widely used in building energy-saving and sound insulation projects.

6.2 Automotive Industry

The automotive industry has extremely strict requirements on glass safety and performance, and almost all automotive glass (except for individual small decorative glasses) is tempered glass or laminated tempered glass produced by tempering furnaces. Automotive front windshields generally adopt laminated tempered glass, which can maintain integrity even when broken, avoiding fragments from hurting passengers; automotive side windows and rear windshields adopt single-piece tempered glass, which can be quickly broken into small particles in case of accidents, facilitating passenger escape. In addition, automotive sunroofs, rearview mirror glasses and instrument panel protective glasses also use high-quality tempered glass processed by precision tempering furnaces.

6.3 Home Appliance and Electronic Products

In the home appliance industry, tempered glass is used in the door panels of refrigerators, ovens, microwave ovens, the panels of induction cookers, the shells of washing machines, and the screens of televisions. The high thermal stability of tempered glass can adapt to the high-temperature working environment of kitchen appliances, and its high strength can resist collision and scratch during use. In the electronic information industry, with the popularization of smart phones, tablet computers, liquid crystal displays and other products, ultra-thin tempered glass processed by chemical or special thermal tempering furnaces is used as the protective screen of electronic products, with high hardness, scratch resistance and impact resistance, protecting the display screen from damage.

6.4 New Energy and Solar Energy Industry

With the rapid development of the global new energy industry, tempered glass has become an important component of solar photovoltaic modules and solar thermal collectors. Solar tempered glass produced by special tempering furnaces has high light transmittance, low iron content, excellent weather resistance and mechanical strength, which can protect the solar cells inside the module from wind, sand, hail and other external impacts, and ensure the long-term stable operation of photovoltaic power generation systems. The demand for solar tempered glass is growing rapidly with the large-scale application of photovoltaic power generation, which has put forward higher requirements for the performance of glass tempering furnaces.

6.5 Other Special Fields

In addition to the above fields, tempered glass is also used in aerospace, marine engineering, medical equipment, furniture manufacturing and other fields. For example, the cockpit glass of aircraft, the observation window of ships, the protective cover of medical equipment, and the glass tabletop of high-end furniture all use high-performance tempered glass processed by professional tempering furnaces, meeting the special performance requirements of different industries.

7. Advantages and Existing Challenges of Modern Glass Tempering Furnaces

7.1 Core Advantages

Modern glass tempering furnaces, after continuous technological innovation and optimization, present significant advantages in terms of performance, efficiency and energy saving compared with traditional equipment. Firstly, high degree of automation and intelligence reduces the dependence on manual operation, improves production efficiency and product stability, and reduces the defective rate caused by human factors. Secondly, excellent heating uniformity and cooling precision ensure that the tempered glass has uniform stress distribution, high flatness and stable mechanical properties, adapting to the processing of high-end coated glass and special glass. Thirdly, energy-saving and environmental protection performance is significantly improved through the optimization of thermal insulation structure, the application of convection heating technology and the recovery of waste heat, reducing energy consumption per unit product and meeting the national dual-carbon policy requirements. Fourthly, large-scale and multi-functional processing capacity meets the market demand for large-format, special-shaped and diversified tempered glass products, expanding the application scope of tempered glass.

7.2 Existing Challenges

Despite the rapid development of glass tempering furnace technology, there are still some challenges in the industrial application process. Firstly, the problem of self-explosion of tempered glass has not been completely solved. The self-explosion is mainly caused by the nickel sulfide inclusions inside the glass and the uneven stress distribution during the tempering process. Although the homogenization treatment furnace can reduce the self-explosion rate, it increases the production cost and process flow. Secondly, the processing of ultra-thin and ultra-thick glass still has technical bottlenecks. Ultra-thin glass (thickness <2mm) is easy to warp and break during the tempering process, while ultra-thick glass (thickness >25mm) has low heating efficiency and difficult control of cooling stress, requiring further research and development of specialized tempering furnace technology. Thirdly, the high cost of high-end intelligent tempering furnaces limits the popularization and application of small and medium-sized enterprises, and the technical gap between domestic and international high-end equipment still exists in some core components and control systems. Fourthly, the energy consumption and environmental protection requirements are becoming increasingly stringent, and the traditional tempering furnace energy-saving technology still has room for improvement, requiring the research and development of more efficient heating and cooling technologies to reduce carbon emissions.

8. Future Development Trends of Glass Tempering Furnaces

Driven by technological progress, market demand and policy guidance, the global glass tempering furnace industry will present the following development trends in the future:

8.1 Intelligent and Digital Upgrading

The future glass tempering furnaces will develop towards higher intelligence and digitization, integrating technologies such as artificial intelligence, big data analysis and the Internet of Things. The equipment will realize automatic optimization of process parameters, real-time online monitoring of glass quality, predictive maintenance of equipment faults and remote intelligent management. Through the collection and analysis of production data, the system can automatically adjust the heating, cooling and conveying parameters according to the production status, further improving product quality and production efficiency, and realizing the intelligent manufacturing of the glass tempering production line.

8.2 High Efficiency and Energy Saving Technology Innovation

Energy conservation and emission reduction will become the core research direction of glass tempering furnace technology. New heating technologies such as microwave heating, laser heating and high-efficiency infrared convection heating will be applied to tempering furnaces, improving heating efficiency and reducing energy consumption. At the same time, the waste heat recovery system will be further optimized, recovering the heat generated in the cooling and exhaust processes for preheating the original glass or heating the furnace body, realizing the recycling of energy. The research and development of low-emission and low-energy-consumption tempering furnace structures will also be accelerated to meet the global dual-carbon development goals.

8.3 Specialized and Diversified Product Development

Aiming at the demand for specialized tempered glass in different industries, glass tempering furnaces will develop towards specialization and diversification. Specialized tempering furnaces for ultra-thin electronic glass, ultra-thick architectural glass, curved large-format glass, high-temperature resistant solar glass and other products will be launched successively, meeting the personalized and high-end processing needs of the market. At the same time, the integration of tempering furnaces with other glass processing technologies (such as coating, laminating, engraving) will be realized, forming a one-stop glass deep-processing production line and improving the added value of products.

8.4 Green and Environmental Protection Development

In response to global environmental protection requirements, future glass tempering furnaces will adopt more green and environmentally friendly materials and processes, reducing the emission of volatile organic compounds, dust and noise. The closed-loop recycling of cooling water and exhaust gas will be fully realized, minimizing the impact of equipment production on the environment. In addition, the recyclable design of tempering furnace equipment will be strengthened, extending the service life of equipment and reducing the generation of industrial waste.

8.5 Internationalization of Core Technology and Localization of High-End Components

With the development of the global glass industry, the core technology of glass tempering furnaces will tend to be internationalized, and the technical exchanges and cooperation between countries will be more frequent. For domestic equipment manufacturers, accelerating the localization research and development of high-end core components (such as precision convection fans, high-performance temperature sensors, intelligent control systems) will break the foreign technology monopoly, reduce the production cost of high-end tempering furnaces, and improve the international competitiveness of domestic glass tempering furnace equipment.

9. Conclusion

Glass tempering furnace, as the core equipment of the glass deep-processing industry, has a pivotal position in promoting the development of the global glass industry and meeting the demand for high-performance safety glass in various fields. Through the analysis of its working principle, structural composition, classification, process flow, application fields and development trends, it can be seen that the glass tempering furnace industry is in a period of rapid technological innovation and structural optimization. With the continuous progress of materials science, mechanical engineering, automation control and other disciplines, and the continuous growth of market demand for high-end tempered glass, glass tempering furnaces will develop towards intelligence, high efficiency, energy saving, specialization and green environmental protection.

In the future, glass tempering furnace manufacturers need to increase R&D investment, break through key technical bottlenecks, optimize product performance, and meet the diversified and high-end needs of the market. At the same time, industry practitioners should strengthen technological exchanges and cooperation, promote the upgrading and transformation of the glass deep-processing industry, and make greater contributions to the development of construction, automotive, new energy, electronic information and other industries. With the continuous improvement of technology and the expansion of application fields, glass tempering furnaces will continue to play an important role in the global industrial system and promote the sustainable development of the safety glass industry.

How to Add Butyl Glue for Butyl Extruding Machine

1. Introduction

The butyl extruding machine is an indispensable core equipment in the manufacturing process of insulating glass, architectural door and window sealing, automotive glass assembly, and other industrial sealing applications. It is specially designed to melt solid or granular butyl glue into a uniform molten state through a precise heating system and extrude the glue stably through a screw propulsion mechanism, so as to complete the sealing and bonding of components. The operation of adding butyl glue is the most critical initial step in the entire working cycle of the butyl extruding machine, which directly determines the continuity of glue extrusion, the uniformity of glue output, the processing accuracy of sealing products, and the service life of the equipment. Improper glue adding operations, such as uncleaned glue barrels, uneven filling, improper preheating parameters, and poor sealing of the glue barrel cover, will lead to a series of problems including discontinuous glue extrusion, air bubbles in the glue, uneven glue output, blockage of the extrusion channel, and even mechanical failure of the equipment.

This article systematically elaborates on the standardized operation process of adding butyl glue for the butyl extruding machine, covering pre-operation preparation, equipment safety inspection, step-by-step operation procedures for different forms of butyl glue (solid strips and granular glue), post-operation treatment, safety operation specifications, common fault troubleshooting, and daily maintenance of the glue adding system. All contents are compiled in strict accordance with international industrial safety standards and equipment operation specifications, aiming to provide operators with a comprehensive and authoritative technical guide to ensure the safe, efficient, and high-quality completion of the butyl glue adding operation, and to lay a solid foundation for the stable operation of the butyl extruding machine and the qualified production of sealing products.

2. Pre-operation Preparation

Adequate and comprehensive pre-operation preparation is the prerequisite to ensure the smooth progress of the butyl glue adding operation and avoid potential risks. Operators must complete the preparation work in strict accordance with the following three dimensions: personnel, equipment, and materials.

2.1 Personnel Preparation and Professional Training

All operators engaged in the butyl glue adding operation must receive systematic professional training, including the structural composition of the butyl extruding machine, working principle, performance parameters of butyl glue, standard operating procedures, safety precautions, and emergency response plans. Only after passing the theoretical and practical assessments can they take up their posts independently. During the operation, operators must wear complete personal protective equipment (PPE) that meets industrial safety standards, including high-temperature and cut-resistant work clothes, heat-insulating and anti-slip gloves, anti-splash safety goggles, and steel-toe safety shoes. It is strictly forbidden to operate with loose cuffs, unbound long hair, or wearing metal jewelry such as rings, bracelets, and necklaces, so as to prevent entanglement with the rotating screw or scalding by high-temperature components of the equipment. In addition, a clear safety warning area should be divided around the equipment, and obvious warning signs such as "Non-operators Prohibited from Entering" and "High Temperature Danger" should be set up to avoid misoperation or accidental injury caused by irrelevant personnel approaching the operating area.

2.2 Equipment Safety and Functional Inspection

Before adding butyl glue, a comprehensive and detailed inspection of the butyl extruding machine must be carried out to ensure that all systems of the equipment are in normal working condition, covering the electrical system, heating system, mechanical structure, and control system.

First, inspect the electrical and pneumatic systems. Check the integrity of the power cord, plug, and socket of the equipment, confirm that there is no damage, aging, or exposed wires, and verify that the leakage protector and circuit breaker are in normal operating state. For butyl extruding machines equipped with pneumatic auxiliary devices, check the air pressure pipeline for air leakage, blockage, or water accumulation, adjust the working air pressure to the range of 0.4-0.6 MPa specified by the equipment, and drain the accumulated water in the air filter and air storage tank regularly to prevent moisture from affecting the pneumatic components. At the same time, test the sensitivity of the emergency stop button, start/stop switch, and parameter adjustment buttons on the control panel to ensure that all control functions can respond quickly and effectively in case of an emergency.

Second, focus on inspecting the heating system, which is the core to ensure the melting effect of butyl glue. Turn on the equipment power supply in advance, set the heating temperature of the glue barrel and extrusion die according to the type and performance parameters of the butyl glue (generally 80-120°C, subject to the glue manufacturer's instructions and equipment manual), and check the working state of the temperature controller, temperature sensor, and heating tube. Ensure that the temperature of each heating zone can be accurately controlled, stabilized within the set range, and free from temperature overshoot, insufficient heating, or temperature fluctuation, so as to avoid incomplete melting or thermal decomposition of butyl glue.

Third, inspect the glue barrel and extrusion mechanism. Open the glue barrel cover, check the inner wall of the glue barrel, extrusion screw, and glue outlet channel for residual solidified butyl glue, metal debris, dust, or other impurities. Check the surface of the extrusion screw for wear, deformation, or scratches, and confirm that the screw can rotate freely without jamming or abnormal noise. At the same time, check the sealing ring of the glue barrel cover for aging, cracking, deformation, or hardening, and replace it with a new sealing ring of the same model in time if it is damaged, so as to prevent glue leakage during the extrusion process.

Finally, inspect the auxiliary tools and collection devices. Prepare special glue loading tools, stainless steel scrapers, lint-free cleaning cloths, industrial alcohol, waste glue collection barrels, torque wrenches, and other auxiliary tools, and confirm that all tools are clean, intact, and free of impurities to avoid contaminating the butyl glue during the operation.

2.3 Material Selection and Preparation

The quality of butyl glue directly affects the sealing performance and extrusion stability of the final product, so the selection and preparation of butyl glue must be strictly controlled. Operators must select qualified butyl glue products that match the model of the butyl extruding machine, and check the production date, shelf life, appearance quality, and factory certification of the butyl glue before use. It is forbidden to use expired, deteriorated, damp, contaminated, or uncertified butyl glue. Solid butyl glue strips should be flat, uniform in texture, free of cracks, hard blocks, bubbles, and impurities; granular butyl glue should have uniform particle size, no agglomeration, moisture, or foreign matter.

In addition, calculate the amount of butyl glue to be added according to the effective capacity of the glue barrel of the butyl extruding machine and the actual production demand, and reserve a certain expansion space at the top of the glue barrel (generally 5-10 cm from the top of the glue barrel). This is to prevent the butyl glue from overflowing due to thermal expansion after being heated and melted, which will cause equipment pollution or safety hazards. At the same time, place the butyl glue in a dry, clean, and dust-free environment to avoid secondary contamination before use.

3. Standard Operation Steps for Adding Butyl Glue

The butyl glue adding operation must be carried out in strict accordance with the step-by-step standardized procedure, and each operation link must be implemented carefully to ensure the accuracy and safety of the process.

3.1 Equipment Shutdown and Safety Locking

Before opening the glue barrel cover for glue adding operation, the equipment must be completely shut down and locked to eliminate all potential safety risks. First, press the emergency stop button of the butyl extruding machine to cut off the power output of the equipment, then turn off the main power switch and air supply valve in sequence, and hang a prominent "No Operation, Maintenance in Progress" warning sign on the control panel to prevent other personnel from misstarting the equipment. Then, wait for the glue barrel, extrusion die, and heating pipeline to cool down naturally to a safe temperature below 40°C. For butyl extruding machines equipped with a quick cooling function, the cooling system can be turned on to accelerate the cooling process, so as to avoid scalding accidents caused by high-temperature components during the operation.

3.2 Opening the Glue Barrel Cover and Thorough Cleaning

Locate the locking device of the glue barrel cover, which is usually designed as a bolt lock, rotary lock, or quick-release lock. Loosen the locking nut or rotate the lock handle in the specified counterclockwise direction, and slowly remove the glue barrel cover and place it on a clean anti-slip mat to avoid contamination of the sealing surface. Next, carry out a thorough cleaning of the glue barrel and internal components: use a special stainless steel scraper to gently scrape off the residual solidified butyl glue on the inner wall of the glue barrel, the root of the extrusion screw, the glue outlet channel, and the check valve, and collect the scraped waste glue into a special sealed waste glue collection barrel. It is strictly forbidden to use hard metal tools such as steel brushes, screwdrivers, or angle grinders for scraping, so as not to scratch the inner wall of the glue barrel and the surface of the screw, which will affect the sealing performance and service life of the equipment.

After scraping off the residual glue, dip a clean lint-free cloth in industrial alcohol, wipe the inner wall of the glue barrel, the surface of the extrusion screw, the sealing surface of the glue barrel cover, and the filter screen repeatedly until there is no residual glue, impurities, or oil stains, and then let it air dry naturally. For the check valve and filter screen at the bottom of the glue barrel, remove them for separate cleaning, check for blockage, damage, or wear, and reinstall them after confirming that they are intact and clean, so as to ensure the smooth flow of the extrusion channel.

3.3 Adding Butyl Glue

The operation methods of adding solid butyl glue strips and granular butyl glue are slightly different, and operators should select the corresponding operation procedures according to the form of butyl glue used in actual production.

3.3.1 Adding Solid Butyl Glue Strips

Take the qualified solid butyl glue strips, and cut them into segments of 10-20 cm according to the inner diameter and depth of the glue barrel, ensuring that the cross-section of each glue strip is flat, free of cracks, burrs, or impurities. Then, put the cut butyl glue strips into the glue barrel one by one along the inner wall, and arrange them evenly around the extrusion screw in a circumferential direction. It is forbidden to throw the glue strips violently into the glue barrel, so as to avoid impact damage to the screw or the inner wall of the glue barrel. During the filling process, ensure that the glue strips are closely arranged without large gaps, and stop filling when reaching the reserved material level. After filling, use a special pressing tool to gently press the butyl glue strips layer by layer to eliminate internal gaps and ensure compact filling, which is conducive to the uniform melting and stable extrusion of butyl glue.

3.3.2 Adding Granular Butyl Glue

Install a special feeding funnel at the mouth of the glue barrel to prevent the granular butyl glue from splashing during the pouring process and causing material waste or environmental pollution. Slowly pour the qualified granular butyl glue into the glue barrel through the funnel, and stir the glue particles appropriately with a clean plastic rod during the pouring process to ensure even distribution of the glue particles and avoid bridging, agglomeration, or local accumulation in the glue barrel. Control the filling amount strictly according to the scale line of the glue barrel, and stop adding when reaching the specified material level, with the same reserved expansion space as the solid butyl glue strips.

3.4 Installing the Glue Barrel Cover and Sealing Inspection

After the butyl glue is added, recheck the integrity and cleanliness of the sealing ring of the glue barrel cover, and apply a small amount of food-grade or equipment-specified high-temperature resistant lubricating oil on the surface of the sealing ring to enhance the sealing effect and facilitate the installation of the cover. Align the glue barrel cover with the flange of the glue barrel accurately, place it flat and slowly, and ensure that the sealing ring is completely embedded in the sealing groove without deviation, distortion, or falling off. Then, tighten the locking device of the glue barrel cover evenly and symmetrically in a diagonal sequence. For bolt-locked glue barrel covers, use a torque wrench to tighten each bolt to the specified torque value (subject to the equipment manual) to ensure uniform stress on the cover, good sealing performance, and avoid glue leakage caused by uneven tightening or insufficient torque.

After the installation is completed, conduct a preliminary sealing inspection: manually check the tightness of the glue barrel cover, confirm that there is no gap between the cover and the flange, and ensure that the sealing ring is in close contact with the sealing surface to lay a foundation for the subsequent preheating and extrusion test.

3.5 Preheating and Extrusion Test

Remove the warning sign on the control panel, turn on the main power supply and air supply valve of the equipment, and reset the emergency stop button to the normal state. Enter the parameter setting interface of the control panel, set the heating temperature of each zone of the glue barrel and extrusion die according to the process requirements, turn on the heating system, and start the preheating program. During the preheating process, observe the temperature change data displayed on the control panel in real time, and check whether the equipment has abnormal noise, glue leakage, temperature overshoot, or circuit failure. After the temperature of each heating zone is stable and reaches the set value, keep the temperature for 10-15 minutes to ensure that the butyl glue in the glue barrel is completely melted into a uniform fluid state with appropriate viscosity.

Then, set the extrusion speed of the screw to a low speed of 10-20 rpm for the extrusion test, observe the extrusion state of the butyl glue at the die outlet in real time, and check whether the extruded glue is continuous, uniform, free of air bubbles, impurities, broken strips, or glue leakage. If the extrusion test result is qualified, adjust the extrusion speed to the process required speed for formal production; if there is an abnormality such as discontinuous glue output, air bubbles, or uneven glue output, stop the machine immediately, cut off the power supply and air supply, and check the cause of the fault in combination with the troubleshooting methods, and conduct the extrusion test again after the fault is eliminated.

4. Post-operation Treatment and Record Keeping

Standardized post-operation treatment and complete record keeping are important links to ensure the traceability of the operation process and the long-term stable operation of the equipment.

First, clean the operation site in a timely manner after completing the glue adding and extrusion test. Collect the residual butyl glue, used cleaning cloths, industrial alcohol waste liquid, and other waste materials into designated sealed containers, and wipe the surface of the equipment, control panel, and surrounding ground with a clean cloth to keep the operation area clean and tidy, in line with industrial production environmental standards.

Second, recheck the operating state of the equipment: check the fastening state of the glue barrel cover, the working state of the heating system, the sealing condition of each interface, and the operation state of the extrusion screw, confirm that there is no glue leakage, abnormal noise, or potential failure, and ensure that the equipment can meet the requirements of formal production.

Third, make a detailed and accurate record in the equipment operation log, including the type and amount of butyl glue added, preheating temperature and holding time, extrusion test parameters, operation time, operator information, and abnormal conditions during the operation. This record is an important basis for subsequent production traceability, equipment maintenance, and fault analysis, and must be kept properly for future reference.

For butyl extruding machines that need to be shut down for a long time, after adding the butyl glue, the equipment should be preheated regularly (once every 3-5 days) to keep the butyl glue in a molten state, prevent the glue from solidifying and blocking the extrusion channel, and extend the service life of the equipment.

5. Safety Precautions During Glue Adding Operation

Safety is the top priority in the operation of industrial equipment, and operators must strictly abide by the following safety precautions during the butyl glue adding operation to avoid personal injury and equipment damage.

First, high-temperature safety protection. During the preheating and operation of the equipment, the surface temperature of the glue barrel, extrusion die, heating pipeline, and other components is very high, and it is strictly forbidden to touch these high-temperature components with bare hands or unprotected parts of the body to avoid high-temperature scalding. If scalding occurs accidentally, take first aid measures immediately (such as flushing with cold water) and seek medical attention in time.

Second, mechanical safety protection. During the operation of the extrusion screw, it is strictly forbidden to extend hands, arms, or any tools into the glue barrel, extrusion channel, or the rotating area of the screw to avoid mechanical entanglement, extrusion, or shear injury. If it is necessary to clean, inspect, or maintain the screw and other components, the equipment must be completely shut down, the power supply and air supply must be cut off, and the operation can be carried out only after the screw is completely stopped.

Third, electrical safety protection. Do not splash water, industrial alcohol, or other liquids on the control panel, motor, electrical components, and wiring of the equipment to prevent short circuit, electric shock, or equipment burnout. In case of electrical failure, the power supply must be cut off immediately, and professional electrical maintenance personnel shall be arranged for repair, and non-professionals shall not disassemble or repair the electrical system without authorization.

Fourth, material safety protection. Butyl glue is a chemical polymer material, and it is forbidden to ingest, inhale, or contact with eyes and mucous membranes for a long time. If the butyl glue splashes into the eyes accidentally, rinse with plenty of clean water immediately and seek medical attention in time. The waste butyl glue and cleaning waste liquid shall be disposed of in strict accordance with national environmental protection regulations, and shall not be discarded, discharged, or piled up at will to avoid environmental pollution.

Fifth, emergency response specifications. In case of emergencies such as equipment jamming, glue leakage, abnormal noise, power failure, or air failure during the glue adding or extrusion process, the operator must press the emergency stop button immediately, cut off the power supply and air supply at the same time, and then check and handle the fault after confirming the safety of the equipment and the surrounding environment. It is strictly forbidden to troubleshoot, clean, or maintain the equipment with the power on or the screw running.

6. Troubleshooting of Common Problems in Glue Adding Process

In the actual butyl glue adding operation, various faults may occur due to improper operation, material quality problems, equipment aging, or parameter setting errors. The following is a detailed analysis of the common faults, causes, and targeted solutions in the glue adding process:

6.1 Glue Leakage at the Glue Barrel Cover

Common Causes: Aging, damage, or improper installation of the sealing ring; uneven tightening or insufficient torque of the locking bolt; contamination of the sealing surface with impurities, glue residue, or scratches on the flange; deformation of the glue barrel cover or flange.

Solutions: Replace the sealing ring with a new one of the same model and specification; re-tighten the locking bolt with a torque wrench in a diagonal sequence to the specified torque value; clean the sealing surface thoroughly with industrial alcohol, and repair or replace the flange if there are scratches; replace the deformed glue barrel cover or flange in time.

6.2 Uneven Extrusion of Butyl Glue

Main Causes: Loose filling of butyl glue with large gaps or agglomeration; insufficient preheating temperature or short holding time, resulting in incomplete melting of the glue; wear, deformation, or blockage of the extrusion screw and filter screen; unstable extrusion speed or pressure.

Solutions: Reopen the glue barrel cover, compact the glue or break up the agglomerated glue to ensure uniform filling; increase the preheating temperature appropriately or extend the holding time to ensure complete melting of the butyl glue; check the wear of the screw, replace the seriously worn screw, and clean or replace the blocked filter screen; calibrate the extrusion speed and pressure control system to ensure stability.

6.3 Air Bubbles in the Extruded Butyl Glue

Causes: Moisture, impurities, or air trapped in the butyl glue; incomplete cleaning of the glue barrel, resulting in residual air in the channel; excessive preheating temperature, causing thermal decomposition of the butyl glue to produce gas; poor sealing of the glue barrel cover, leading to air intake.

Solutions: Use dry, impurity-free butyl glue, and vacuumize the glue barrel (for equipment with vacuum function) during glue adding to remove air; clean the glue barrel and extrusion channel thoroughly to eliminate residual air; adjust the preheating temperature to the process specified range to avoid glue decomposition; recheck and improve the sealing performance of the glue barrel cover.

6.4 Difficulty in Opening or Tightening the Glue Barrel Cover

Causes: Rusting, jamming, or lack of lubrication of the locking device; bonding of the sealing ring to the flange due to high-temperature melting of butyl glue; incorrect operation sequence or excessive force during operation.

Solutions: Apply anti-rust lubricating oil to the locking device, clean the rust and impurities, and ensure flexible rotation; cool the glue barrel completely to separate the bonded sealing ring and flange, and do not pry violently; operate strictly in accordance with the specified opening and tightening sequence, and use appropriate tools to apply force evenly.

6.5 Blockage of the Extrusion Channel

Causes: Use of unqualified butyl glue with hard blocks or impurities; incomplete preheating, resulting in solidification of local butyl glue; residual solidified glue in the channel not cleaned thoroughly; long-term shutdown without preheating, leading to glue solidification.

Solutions: Replace qualified butyl glue free of hard blocks and impurities; increase the preheating temperature and holding time to ensure complete melting of the glue; clean the extrusion channel, check valve, and filter screen thoroughly; preheat the equipment regularly during long-term shutdown to keep the glue in a molten state.

7. Daily Maintenance of the Glue Adding System

Regular and standardized maintenance of the glue adding system of the butyl extruding machine can effectively reduce the failure rate, extend the service life of the equipment, and ensure the stability of the glue adding and extrusion process. The maintenance work is divided into daily, weekly, monthly, and annual maintenance according to the cycle:

7.1 Daily Maintenance (Once per Shift)

Clean the glue barrel, extrusion screw, filter screen, and glue barrel cover after each shift to remove residual butyl glue and impurities; check the fastening state of the locking bolts and the integrity of the sealing ring; test the sensitivity of the emergency stop button and control buttons; record the operation status and abnormal conditions of the equipment in the maintenance log.

7.2 Weekly Maintenance (Once a Week)

Thoroughly clean the inside of the glue barrel and extrusion channel, check the wear of the extrusion screw and filter screen; calibrate the temperature control system to ensure the accuracy of the heating temperature; add lubricating oil or grease to the rotating parts such as the screw bearing; drain the accumulated water in the air filter and air storage tank of the pneumatic system.

7.3 Monthly Maintenance (Once a Month)

Check the aging degree of the sealing ring, heating tube, and power cord, and replace the aging parts in time; calibrate the pressure gauge and temperature sensor to ensure the accuracy of measurement data; inspect the working state of the motor and transmission mechanism, and eliminate abnormal noise and vibration; clean the control cabinet and remove dust to ensure the normal heat dissipation of electrical components.

7.4 Annual Maintenance (Once a Year)

Conduct a comprehensive disassembly and inspection of the glue adding system, replace all wearing parts such as the sealing ring, filter screen, and screw; replace the lubricating oil, hydraulic oil (if equipped), and filter element; conduct a comprehensive safety performance test of the equipment, including safety protection devices, grounding system, and overload protection; update the equipment maintenance file and record the maintenance content and results in detail.

8. Conclusion

The operation of adding butyl glue is a key link that runs through the use and maintenance of the butyl extruding machine, involving multiple dimensions such as personnel operation, equipment inspection, material control, parameter setting, and safety protection. Only by strictly abiding by the standardized operation procedures, doing a good job in pre-operation preparation, in-process standardized operation, and post-operation treatment and maintenance, and firmly establishing a safety first operation concept, can the stable operation of the butyl extruding machine be ensured, the quality of butyl glue extrusion be improved, potential safety and quality hazards be reduced, and the production efficiency and product qualification rate be effectively improved.

With the continuous development of the sealing industry and the continuous upgrading of equipment technology, the requirements for the operation skills and professional quality of operators are also getting higher and higher. Operators should continuously learn new technologies, new processes, and new standards, master the operation and maintenance skills of advanced butyl extruding machines, and adapt to the development needs of industrial production. At the same time, enterprises should strengthen the professional training and safety management of operators, formulate and improve standardized operation systems and maintenance systems, and promote the standardized, intelligent, and efficient development of the operation and maintenance of butyl extruding machines, so as to provide a strong guarantee for the high-quality development of the sealing processing industry.