Professional Butyl Extruder

Butyl Coating Machine: Core Equipment for Precision Sealing in Modern Insulating Glass Manufacturing

Abstract

In the global push for energy-efficient buildings and high-performance architectural and automotive glass, insulating glass (IG) has become a cornerstone material, with its thermal insulation, soundproofing, and durability directly dependent on the quality of edge sealing. The butyl coating machine, as a critical piece of automated equipment in the IG production line, is specifically designed for the uniform, continuous application of hot-melt butyl rubber—an essential primary sealant for insulating glass spacers. This article explores the working principle, technical characteristics, core advantages, application scenarios, and development trends of butyl coating machines, demonstrating their indispensable role in ensuring the long-term reliability, production efficiency, and cost-effectiveness of modern insulating glass manufacturing.

1. Introduction

The global demand for energy-saving and environmentally friendly building materials has surged in recent years, driven by stringent carbon neutrality policies and the rapid development of green construction. Insulating glass, composed of two or more glass panes separated by a spacer frame and sealed with dual-layer sealants (primary butyl rubber and secondary polysulfide/silicone sealant), has emerged as the preferred choice for modern commercial and residential buildings, automotive windows, and aerospace components. The primary seal—hot-melt butyl rubber—acts as the first line of defense against moisture penetration, gas leakage, and spacer corrosion, directly determining the service life and performance stability of insulating glass.

Traditional manual or semi-automatic butyl coating methods suffer from inherent flaws such as uneven glue application, inconsistent thickness, low efficiency, and high material waste, which severely compromise the quality of insulating glass and increase production costs. In contrast, modern butyl coating machines integrate advanced PLC control systems, servo-driven precision mechanisms, and intelligent temperature control technology, enabling fully automated, high-precision, and continuous butyl rubber coating. As the "heart" of the insulating glass primary sealing process, butyl coating machines have become an irreplaceable core equipment for manufacturers seeking to upgrade production lines, improve product quality, and enhance market competitiveness.

2. Working Principle and Core Components of Butyl Coating Machine

2.1 Basic Working Principle

Butyl coating machines operate on the principle of hot-melt extrusion and precision coating. Solid or semi-solid hot-melt butyl rubber is first heated to a molten state (typically 110–150°C) in a temperature-controlled heating system, then pressurized and delivered to a precision coating nozzle via a screw or piston extrusion mechanism. The spacer frame (aluminum, warm-edge, or composite spacer) is fed through the machine’s transmission system at a constant speed, and the molten butyl rubber is extruded uniformly onto the two sides of the spacer frame in a continuous, bead-like form. The machine’s control system real-time adjusts extrusion pressure, coating speed, and glue bead thickness to ensure consistent coating quality across different spacer sizes and types. After coating, the spacer is cooled slightly to maintain the shape of the butyl rubber bead, ready for the subsequent glass bonding and secondary sealing processes.

2.2 Core Components and Functions

A high-performance butyl coating machine comprises several key modules, each contributing to its precision and reliability:

2.2.1 Heating and Melting System

This system consists of a heating barrel, temperature sensors, and a digital temperature controller. The heating barrel is equipped with multi-zone electric heating elements and thermal insulation layers to ensure uniform heating of butyl rubber, preventing local overheating (which causes glue degradation) or insufficient melting (which leads to poor fluidity). High-precision temperature sensors (±1°C accuracy) monitor the melting temperature in real time, with the controller automatically adjusting heating power to maintain a stable molten state—critical for consistent extrusion and coating quality.

2.2.2 Extrusion Mechanism

The extrusion mechanism is the core of the butyl coating machine, available in two main types: screw extrusion and piston extrusion.


Screw extrusion: Features a precision-ground screw with a variable pitch design, which pushes molten butyl rubber forward through rotation, ensuring stable and continuous extrusion. It is suitable for high-volume, continuous production lines and can handle a wide range of butyl rubber viscosities.
Piston extrusion: Uses a hydraulic or pneumatic piston to pressurize and extrude molten glue, offering higher extrusion pressure and more precise glue volume control. It is ideal for small-batch, customized production or coating narrow-width spacers, with minimal glue residue and waste.


Modern high-end models often adopt servo-driven screw extrusion, combining the advantages of continuous production and precision control, with extrusion pressure adjustable from 0.5 to 20 MPa to meet diverse coating requirements.

2.2.3 Precision Coating Nozzle

The coating nozzle is designed for uniform glue distribution and adaptability to different spacer specifications. Key features include:


Dual-side coating design: Simultaneously coats butyl rubber on both sides of the spacer frame, improving production efficiency by 50% compared to single-side coating.
Adjustable nozzle gap: The gap between the nozzle and spacer can be finely adjusted (0.1–3 mm) to control glue bead thickness (typically 0.5–2 mm) and width (2–10 mm), compatible with spacers of 6–27 mm width (the most common in insulating glass).
Anti-drip and anti-clogging design: Equipped with a pneumatic or electric glue cutoff valve to prevent glue dripping when the machine stops, and a self-cleaning function to remove residual butyl rubber and avoid nozzle clogging.
Curved surface adaptability: Some models feature a floating nozzle design, which can automatically adjust to the curvature of curved spacers (used in automotive or special-shaped insulating glass), ensuring uniform coating on non-linear surfaces.


2.2.4 Transmission and Positioning System

The transmission system uses a servo motor-driven roller chain or belt conveyor, with a speed range of 0–30 m/min (adjustable via the HMI). High-precision positioning sensors (photoelectric or proximity sensors) detect the position and length of the spacer, automatically starting and stopping the coating process to avoid glue waste on spacer ends. For multi-specification spacers, the system can store up to 50+ sets of parameter presets, enabling one-click switching between different production tasks and reducing setup time by over 80%.

2.2.5 PLC Control and Human-Machine Interface (HMI)

The core control system is based on a Siemens or Mitsubishi PLC, paired with a 7–10 inch touchscreen HMI for intuitive operation. Key functions include:


Real-time display of temperature, extrusion pressure, coating speed, and glue bead thickness.
One-key setting and storage of process parameters for different spacer types and glue formulas.
Fault self-diagnosis and alarm (e.g., over-temperature, low pressure, nozzle clogging), with troubleshooting prompts displayed on the HMI.
Remote monitoring and data export (via Ethernet or USB), supporting production data tracking and quality traceability—critical for compliance with international quality standards (e.g., CE, ASTM, GB/T 11944).


2.2.6 Safety and Auxiliary Systems

To ensure operational safety and equipment durability, butyl coating machines are equipped with:


Safety interlocks: Emergency stop buttons, safety doors, and protective covers that stop the machine immediately when opened, preventing operator contact with high-temperature components and moving parts.
Glue level detection: A sensor monitors the butyl rubber level in the melting barrel, triggering an alarm when the glue is low to avoid empty extrusion.
Cooling system: A forced air cooling or water cooling system cools the coated spacer slightly, maintaining the shape of the butyl rubber bead and preventing deformation during subsequent handling.


3. Technical Advantages of Modern Butyl Coating Machines

3.1 High Precision and Consistent Coating Quality

The most significant advantage of butyl coating machines is their ability to deliver uniform, bubble-free, and consistent butyl rubber coating—a critical requirement for insulating glass primary sealing. Unlike manual coating, which is prone to uneven thickness, gaps, or excess glue, the machine’s servo-driven extrusion and precision nozzle ensure that the glue bead has a consistent cross-section (width and thickness) along the entire length of the spacer (up to 6 m long). This eliminates moisture penetration paths and gas leakage points, significantly improving the insulating glass’s thermal insulation performance and service life (extending it from 5–10 years to 15–20 years or more). For high-value Low-E (low-emissivity) glass and multi-cavity insulating glass, the machine’s non-contact floating nozzle design avoids scratching the sensitive Low-E coating or damaging multi-layer spacers, ensuring product integrity.

3.2 High Production Efficiency and Cost Savings

Automated butyl coating machines drastically improve production efficiency compared to manual or semi-automatic methods. A standard high-speed model can coat spacers at a speed of up to 30 m/min, processing 800–1200 spacer frames per 8-hour shift—a 5–10 times increase in output compared to manual coating. The continuous extrusion design eliminates downtime for glue refilling (large-capacity melting barrels hold 5–20 kg of butyl rubber, reducing refilling frequency), and the one-click parameter switching reduces setup time for different spacer specifications from 30–60 minutes to 2–5 minutes.

In terms of cost savings, the machine’s precise glue volume control reduces butyl rubber waste by 30–50% compared to manual coating (excess glue is minimized, and no dripping or spillage occurs). Additionally, automation reduces labor costs: a single operator can manage 2–3 machines simultaneously, replacing 4–6 manual workers. Over the equipment’s 8–10 year service life, the savings in material and labor costs far outweigh the initial investment, delivering a rapid return on investment (ROI) for manufacturers.

3.3 Wide Compatibility and Versatility

Modern butyl coating machines are highly versatile, compatible with a wide range of spacer types and insulating glass products:


Spacer materials: Aluminum spacers (standard, bent, or welded), warm-edge spacers (stainless steel, composite, or foam), and special-shaped spacers (curved, angled, or multi-cavity).
Spacer specifications: Width 6–27 mm, thickness 0.3–1.2 mm, length up to 6 m, suitable for both small-sized residential glass and large-sized commercial curtain wall glass.
Butyl rubber types: Hot-melt butyl rubber of different viscosities (low, medium, high) and formulations (standard, anti-aging, or low-VOC), compatible with all major butyl rubber brands in the market.
Application scenarios: Flat insulating glass, curved insulating glass, triple-glazing, multi-cavity insulating glass, automotive glass, and solar photovoltaic glass.


Some advanced models also feature a dual-nozzle design for coating multi-cavity spacers (e.g., 3-cavity or 4-cavity spacers used in ultra-high-performance insulating glass), enabling simultaneous coating of multiple glue lines and further expanding their application scope.

3.4 Enhanced Safety and Environmental Compliance

Butyl coating machines prioritize operator safety and environmental protection, addressing the drawbacks of manual coating:


Safety: By automating the high-temperature (110–150°C) coating process, the machine eliminates operator contact with molten butyl rubber and high-temperature components, reducing the risk of burns and repetitive motion injuries. Safety interlocks and emergency stop functions provide additional protection, complying with international safety standards (e.g., OSHA, CE).
Environmental protection: The closed melting and extrusion system minimizes the emission of volatile organic compounds (VOCs) from butyl rubber, improving the workshop air quality. The precise glue control reduces waste, and the self-cleaning nozzle design minimizes residual glue disposal—aligning with global environmental regulations and green manufacturing trends. Many models are also compatible with low-VOC and eco-friendly butyl rubber formulations, further reducing the environmental footprint of production.


3.5 Stable Performance and Low Maintenance

High-quality butyl coating machines are built with durable materials (stainless steel for the melting barrel, hardened alloy for the screw and nozzle, and industrial-grade servo motors) to ensure long-term stable operation under continuous production conditions. The key components have a service life of 50,000+ hours, and the modular design simplifies maintenance: wearing parts (e.g., nozzles, seals) can be replaced quickly, and routine maintenance (e.g., cleaning, lubrication) is minimal. The PLC control system’s fault self-diagnosis function reduces downtime by identifying and resolving issues promptly, ensuring uninterrupted production—critical for large-scale insulating glass manufacturing plants.

4. Application Scenarios of Butyl Coating Machines

4.1 Architectural Insulating Glass Manufacturing

The largest application area of butyl coating machines is the architectural insulating glass industry, covering residential windows, commercial curtain walls, office buildings, shopping malls, and green buildings. In high-rise buildings and energy-saving residential complexes, insulating glass with high-quality butyl rubber primary sealing provides excellent thermal insulation (U-value as low as 1.0 W/(m²·K)) and soundproofing (up to 35–40 dB), reducing heating and cooling costs by 30–50% compared to single-pane glass. Butyl coating machines enable mass production of standard and customized architectural insulating glass, meeting the demand for large-sized glass (up to 3 m × 6 m) used in modern curtain walls and ensuring consistent quality across thousands of units.

4.2 Automotive Glass Production

In the automotive industry, butyl coating machines are used to produce insulating glass for windshields, side windows, sunroofs, and rear windows of passenger cars, commercial vehicles, and new energy vehicles (NEVs). Automotive insulating glass requires not only thermal insulation and soundproofing but also resistance to extreme temperatures (-40°C to 85°C), vibration, and UV radiation. The machine’s precision coating ensures that the butyl rubber seal adheres firmly to the glass and spacer, preventing moisture from entering the glass cavity and causing fogging—critical for driving safety. For curved automotive glass, models with floating nozzles and curved spacer adaptability deliver uniform coating on non-linear surfaces, meeting the strict quality standards of automotive OEMs (e.g., Volkswagen, Toyota, Tesla).

4.3 Solar Photovoltaic (PV) Glass and Special Glass

With the rapid development of the solar energy industry, butyl coating machines are increasingly used in the production of PV insulating glass (used in solar panels and BIPV—building-integrated photovoltaics). PV glass requires a highly durable seal to protect the solar cells from moisture and corrosion, and the machine’s high-precision butyl coating provides a long-lasting primary seal, extending the service life of PV modules to 25+ years. Additionally, butyl coating machines are used in the production of special glass for aerospace, marine, and industrial applications, such as insulated glass for aircraft cabins, ship windows, and industrial furnace observation windows—where sealing reliability under extreme conditions is paramount.

4.4 Small and Medium-Sized Enterprises (SMEs) and Customized Production

Butyl coating machines are not only suitable for large-scale mass production lines but also for SMEs and customized glass manufacturers. Semi-automatic or compact models (with a small footprint and low investment) are ideal for SMEs producing small batches of customized insulating glass (e.g., for villas, specialty buildings, or automotive aftermarket). These models retain the core precision and efficiency advantages of full-automatic machines but with a lower price point and simpler operation, making advanced butyl coating technology accessible to a broader range of manufacturers. Refurbished butyl coating machines (from reputable brands) are also a cost-effective option for SMEs, offering the same performance as new equipment at 50–70% of the cost.

5. Development Trends of Butyl Coating Machines

5.1 Intelligentization and Digitalization

The future of butyl coating machines lies in intelligentization and digital transformation, driven by Industry 4.0 and smart manufacturing. Advanced models will integrate artificial intelligence (AI) and machine learning algorithms to optimize process parameters in real time: for example, automatically adjusting extrusion pressure and temperature based on butyl rubber viscosity changes (caused by temperature or batch differences) to maintain consistent coating quality. IoT (Internet of Things) connectivity will enable remote monitoring, predictive maintenance, and production data analysis—manufacturers can track machine performance, output, and quality from a central control room, and the system will predict component failures (e.g., screw wear, nozzle clogging) and schedule maintenance in advance, reducing unplanned downtime. Digital twin technology will also be applied, allowing manufacturers to simulate coating processes and optimize production lines before physical implementation.

5.2 High-Speed and High-Precision Upgrades

To meet the growing demand for large-scale and high-quality insulating glass, butyl coating machines will continue to evolve toward higher speed and precision. Future models will feature servo-driven systems with faster response times, increasing coating speed to 40–50 m/min while maintaining glue bead precision (±0.05 mm thickness tolerance). The extrusion mechanism will be optimized for higher pressure and more uniform glue distribution, enabling coating of ultra-narrow spacers (3–5 mm width) and ultra-thick glue beads (3–5 mm) for special applications. Additionally, 3D vision sensors will be integrated to detect spacer position and curvature in real time, enabling fully adaptive coating on complex-shaped spacers without manual adjustment.

5.3 Green and Eco-Friendly Design

Sustainability will be a core focus in the development of butyl coating machines, aligning with global carbon neutrality goals. Future models will feature energy-efficient heating systems (e.g., infrared heating or electromagnetic heating) that reduce energy consumption by 20–30% compared to traditional electric heating. The closed-loop glue recycling system will collect and reuse residual butyl rubber, further reducing material waste to less than 5%. Compatibility with bio-based butyl rubber (made from renewable resources) and low-VOC, zero-halogen formulations will be enhanced, making the production process more environmentally friendly. Additionally, the machine’s design will prioritize recyclable materials and modular components, reducing the environmental impact of manufacturing and disposal.

5.4 Integration with Automated Production Lines

Butyl coating machines will be more deeply integrated into fully automated insulating glass production lines, connecting with upstream spacer bending/welding machines, glass washing machines, and downstream glass bonding/secondary sealing robots. The entire production process—from spacer processing to final insulating glass assembly—will be automated, with seamless data exchange between machines via a central control system. This integration will eliminate manual handling, reduce production cycle time by 40–60%, and ensure 100% quality consistency across the entire production line. For example, the spacer bending machine will transmit spacer specifications to the butyl coating machine, which automatically adjusts parameters and starts coating; after coating, the spacer is automatically transferred to the glass bonding station, with no human intervention required.

6. Conclusion

As the core equipment for primary sealing in modern insulating glass manufacturing, the butyl coating machine plays a pivotal role in ensuring product quality, improving production efficiency, and reducing costs. Its technical advantages—high precision, high efficiency, wide compatibility, safety, and environmental protection—address the limitations of traditional coating methods, making it an indispensable tool for manufacturers seeking to meet the demand for energy-efficient, high-performance insulating glass.

With the ongoing development of the global green building and automotive industries, the demand for high-quality insulating glass will continue to grow, driving the continuous innovation of butyl coating machines toward intelligentization, high-speed, green, and integrated production. For insulating glass manufacturers, investing in a high-performance butyl coating machine is not only a practical upgrade for production lines but also a strategic decision to enhance market competitiveness, comply with international quality and environmental standards, and seize opportunities in the rapidly growing energy-saving glass market.

In the future, as technology advances, butyl coating machines will further evolve into smart, connected, and eco-friendly equipment, empowering the insulating glass industry to achieve higher levels of automation, efficiency, and sustainability—contributing to the global transition to a low-carbon, green economy.

References


GB/T 11944-2012, Insulating Glass for Buildings.
ASTM E2190-19, Standard Specification for Insulating Glass Units.
CE Marking Standards for Machinery (2006/42/EC).
International Energy Agency (IEA), Energy Efficiency Trends in Buildings, 2024.
Journal of Glass Technology, Vol. 65, No. 3, 2023: Advances in Insulating Glass Sealing Technology.
Automotive Engineering International, Vol. 28, No. 5, 2024: Sealing Solutions for Automotive Insulating Glass.

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.