What is PUR hot melt adhesive compound machine? Definition of PUR hot melt adhesive compound machine: PUR hot melt adhesive compound machine is a polymer that does not require solvents, does not contain moisture, and is 100% solid meltable. It is solid at room temperature and heated to a certain extent. It becomes a liquid adhesive that can flow and has a certain viscosity, and the PUR hot melt adhesive is coated on the substrate, and then another substrate is combined with the glued substrate. PUR (Polyurethane Reactive) is called moisture curing reactive polyurethane hot melt adhesive in Chinese, also known as moisture curing reactive polyurethane hot melt adhesive laminating machine, or PUR hot melt adhesive coating laminating machine.
PUR hot-melt adhesive composite machine does not need drying equipment due to this process, and has low energy consumption: it does not contain solvents (hot-melt adhesive is 100% solid content) and pollution-free, and operators will not be exposed to a large amount of residual glue due to cleaning. formaldehyde. Compared with the traditional solvent-based (oil glue) and water-soluble adhesives, it effectively solves the inherent disadvantages of the traditional process, and is an ideal production tool for the replacement of the composite machine industry.
Solvent-based and water-based adhesives require an oven (or may need to renovate the existing oven) when curing, and take up more plant space, while increasing the energy consumption of the plant, generating more wastewater and sludge, and production operations. The requirements are stricter, and the disadvantage of solvent glue is obvious, that is, it is very unfriendly to the environment (most of the solvents are harmful). Solvent-based adhesives pollute the environment very seriously. With the improvement of people’s environmental awareness and the establishment and improvement of related laws, the application of solvent-based adhesives is declining at a certain rate every year. Water-based glue has disadvantages such as poor water resistance, poor electrical properties, long drying time, and high energy consumption. Its application is also declining at a certain rate every year. PUR hot-melt adhesive has the advantages of stable performance, high raw material utilization rate, fast production speed, high yield, small equipment footprint and small investment, and has a tendency to gradually replace solvent-based adhesives.
Suzhou REHOW Machinery Co., Ltd. is a professional PUR hot-melt adhesive compound machine, PUR hot-melt adhesive coating compound machine, hot-melt adhesive compound machine, hot-melt adhesive coating compound machine, hot-melt adhesive film compound machine, cow split leather super Fiber composite machine (leather paste microfiber composite machine) and other mechanical equipment R & D and manufacturing enterprises, relying on scientific and technological progress, the company has established and improved product research and development, production and installation, testing and sales, maintenance service system, and its products are favored by the market.
Equipment and working principle
PUR hot melt adhesive compound machine equipment and the working principle of each component
PUR hot melt adhesive machine (abbreviation: PUR hot melt adhesive machine) equipment: it is a kind of solid PUR hot melt adhesive that can be melted, and the melted glue that becomes liquid is transported to the glue coating device through the pressure device to the substrate. Apply coating. It is an electromechanical device integrating precise temperature control function, fluid pressurized conveying function and extrusion coating function. It also has the function of automatic control and automatic tracking of production line speed.
Host: with heating and heat preservation, glue melting, glue output, glue pressure control, primary filtration and other functions. The temperature of the host should be controlled at 5-10 degrees higher than the melting point of the glue, so that it has a certain fluidity and pressure Control is more accurate.
Throat: It has the functions of heating and heat preservation, diverting glue, and outputting liquid hot melt glue from the host to the gun holder module. The temperature can be kept at a temperature slightly higher than the melting point of the glue.
Gun seat: It has the function of heating and heat preservation, secondary filtration, and conveying the glue to the gun body, and heating the compressed air as needed. The temperature can be increased appropriately according to the glue spraying effect. Make the fluidity of the glue better.
Gun body: It has the function of opening and closing the glue, and is equipped with various nozzles and scrapers according to the needs to meet the needs of users. There are spiral spray guns, coating scraping guns, fiber spray guns, Z-shaped spray guns, point guns, etc. wait.
Automatic compensation control system: with output signal to control the solenoid valve, the compressed air controlled by the solenoid valve drives the work of the gun body to control the opening and closing of the glue. And output 0-10V DC voltage to control the inverter to drive the motor to rotate. The output voltage is directly proportional to the speed of the production line being tested. Glue position, glue breaking length and tracking voltage can be adjusted online. Devices that detect the speed of the production line include proximity switches, rotary encoders, etc.
PUR hot-melt adhesives are collectively referred to in the industry. In fact, there are many types of hot-melt adhesives, including EVA, PA, PES, PUR, pressure-sensitive adhesive hot-melt adhesives, and so on.
PUR hot melt adhesive characteristics
The main component of PUR hot melt adhesive is isocyanate-terminated polyurethane prepolymer. The adhesiveness and toughness (elasticity) of PUR can be adjusted, and it has excellent bonding strength, temperature resistance, chemical corrosion resistance and aging resistance.
⒈PUR hot melt adhesive is solid, when heated to a certain extent, it melts into a liquid and spreads it on the substrate, and it will not melt again after curing.
2. Moisture curing, no drying process, fast and energy-saving; the adhesive layer has certain flexibility, hardness, and certain toughness.
3. Excellent initial strength, but also has the function of cross-linking and curing, and the final bonding strength is higher;
4. Single-component type, easy for industrial automation and mechanized operation, high production efficiency.
5. Because the product itself is solid, it is convenient for packaging, transportation and storage.
6. Does not contain any organic solvents, 100% solid content, non-polluting, non-toxic, green and environmentally friendly.
7. Excellent heat resistance, water resistance, chemical resistance, durability, etc.
8. And the advantages of simple production process, high added value, high viscosity and high speed, etc.
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9. Hot-melt adhesive has stable performance, high raw material utilization rate, fast production speed and high yield.
10. The equipment occupies a small area and has the advantages of small investment.
PUR hot-melt adhesive compound machine equipment uses 100% solid hot-melt adhesive that does not contain pollution-producing ingredients. After being heated into a liquid state, it is evenly and regularly coated on the surface of the work to achieve the purpose of bonding. According to different processing objects, different coating forms such as dispensing, spraying, rolling, and fiber coating can be selected. Due to the simple operation of the equipment, reliable and fast bonding, high processing efficiency, and uniform coating with small glue consumption, no pollution to the environment, and in line with current environmental protection requirements, it is used in shoemaking, packaging, leather goods, paper boxes, accessories, building materials, etc. , Sports equipment, sanitary products, toys, electronics, electrical appliances, leather, furniture and other industries are increasingly selected as supporting production equipment.
Cleaning method Coating blade cleaning: After the equipment is heated, wipe it with dry gauze.
Roller shaft cleaning: use a clean dry gauze dipped in 75% alcohol to wipe the stainless steel roller shaft. If there is glue on the surface, use a dry gauze dipped in 1620 solvent/ethyl acetate solvent to wipe;
The glue on the surface of the rubber roller shaft must not be treated with organic solvents, so as not to damage the rubber roller shaft, it should be removed with strong viscous curing glue.
The outer surface of the equipment; cleaning method: wipe with a clean dry gauze dipped in 75% alcohol.
Batch change cleaning: PUR hot melt adhesive compound machine glue box and hose cleaning (applicable to changing the glue model and coating method): empty the original glue and add 2~3Kg of new glue, heat until completely melted, and then empty it completely. Then add a new type of glue, and drain at least 1Kg after it is completely melted to start formal production.
Coating head cleaning (applicable to changing glue models and coating methods): Wipe with dry gauze after the equipment is heated.
Coating and compounding roller shaft: Use a clean dry gauze to wipe the dust on the surface. If there is glue on the surface, do not use organic solvents to treat it, so as not to damage the rubber roller shaft. It should be removed with a strong curing adhesive.
Cleaning of the corona device: After confirming that the power is turned off, wipe it with a clean dry gauze dipped in 75% alcohol.
Cleaning of PUR hot melt adhesive laminating machine in non-fixed cycle: When the coating method and glue type grade are changed, the coating head of the PUR hot melt adhesive laminating machine must be cleaned. When cleaning, the coating head must be removed before the glue is solidified, and dry gauze should be used. Wipe the applicator tip clean with solvent. During the production process, the overflowing glue must be wiped off with a clean gauze when the equipment is shut down and turned on. Clean the filter screen of the glue box of the PUR hot melt adhesive compound machine for half a month. PUR hot melt adhesive compound machine coating head filter cleaning. If the production is stopped for more than one month, all coating equipment must be cleaned according to the above-mentioned content and requirements of daily, before and after batch change, half a month and non-fixed cycle cleaning before they can be put into use; After the original glue is emptied, about 30Kg of white mineral oil must be added to dissolve the residual glue. After emptying, about 30Kg of white mineral oil must be added to dissolve again, and it must be completely emptied before use.
Use and Daily Maintenance
1. Safety matters during installation of PUR hot melt adhesive compound machine
1. When installing the PUR hot melt adhesive compound machine, a correct and effective grounding wire must be connected. Any equipment that uses high voltage electricity needs to have a grounding wire. When the grounding wire is not used, any PUR hot melt adhesive compound machine has insulator protection components, which may still form a voltage conductor and cause the risk of electric shock.
2. According to the load required by the PUR hot-melt adhesive compound machine and its auxiliary peripheral equipment, check whether the power cord used and the insulation protection meet the regulations. The load of the wire must be higher than the rated power of the PUR hot-melt adhesive compound machine.
3. Make sure that the voltage connected to the PUR hot-melt adhesive compound machine from the outside world is consistent with the PUR hot-melt adhesive compound machine itself. For example, if the single-phase 220v voltage standard PUR hot-melt adhesive compound machine equipment uses 380V power supply, the PUR hot-melt adhesive will be damaged. Composite machine spraying equipment, such as single-phase 220v voltage standard PUR hot-melt adhesive compound machine equipment, if the power supply is lower than 220V, the equipment design performance cannot be achieved, and the PUR hot-melt adhesive compound machine may be damaged. When wiring, ensure that its power supply The line is correctly connected to the position of the external circuit breaker.
4. Make sure that the PUR hot-melt adhesive compound machine is operated at the specified voltage. If the voltage used is different from the specified voltage, it may cause the PUR hot-melt adhesive compound machine to be burned.
2. Safety matters during daily operation of PUR hot melt adhesive compound machine
1. Avoid operating the PUR hot melt adhesive compound machine around volatile and explosive raw materials or gases. Inflammable and explosive materials cannot be stored around the spraying equipment of the PUR hot melt adhesive compound machine.
2. Do not operate the PUR hot melt adhesive compound machine without proper protective devices, good insulators or good protective panels. Only professionally trained personnel can disassemble and repair the machine when maintenance is required.
3. Do not operate the PUR hot melt adhesive laminating machine in an environment where the temperature is lower than 0°C and the temperature is higher than 50°C.
4. Try to use it in places where there is no fast flowing air. Because when the hot-melt adhesive nozzle assembly is exposed to the fast-circulating air, the rapid cooling will affect the hot-melt adhesive flow of the nozzle assembly, and it is easy to cause stringing.
5. When adding hot melt adhesive, it should be added before there is at least one-third of the hot melt adhesive in the melt adhesive pot, so as to avoid adding glue when there is no hot melt adhesive in the hot melt adhesive pot, which will affect normal production.
6. The amount of supplementary glue shall not exceed 80% of the total volume of the hot melt glue pot.
3. Matters needing attention when using PUR hot melt adhesive compound machine
1. When operating the PUR hot-melt adhesive compound machine, do not place other sundries on the machine body or use it as a heightening device.
2. When moving or lifting the PUR hot-melt adhesive compound machine, only its base is allowed to be used as a moving point. Never use the plastic pot cover, electrical box door, and electrical components on the control panel of the PUR hot-melt adhesive compound machine. Or the joint on the insulation pipe is used as an auxiliary to lift the PUR hot melt adhesive compound machine. Abnormal handling will damage the PUR hot melt adhesive compound machine spraying equipment.
4. Safety matters during maintenance and repair of PUR hot melt adhesive compound machine spraying equipment
When maintaining and repairing the PUR hot melt adhesive compound machine, the following main safety precautions should be taken:
1. Before maintenance and repair of the PUR hot-melt adhesive compound machine, the power supply on the PUR hot-melt adhesive compound machine and the total power supply connected to the outside world must be cut off first, and no live operation is allowed.
2. When disassembling, maintaining and repairing, workers should not wear earrings, watches, necklaces, bracelets and other conductive decorations to prevent accidents.
3. Do not disassemble, check and adjust any parts on the PUR hot melt adhesive compound machine unless you have sufficient understanding of the performance of the equipment.
4. Do not disassemble and repair the PUR hot melt adhesive compound machine alone unless there are other people assisting, and in the event of an accident, mechanical damage or personal injury, immediate help or first aid can be given.
5. Only qualified personnel can perform maintenance work on the PUR hot melt adhesive compound machine.
6. In any case, do not touch the wire connectors that may be exposed to the outside world or other components that have wires connected and are not loose.
7. Before removing or moving the protective device on the PUR hot melt adhesive compound machine or replacing components, the power supply must be cut off first.
8. If possible, try to stand on the plastic blanket for maintenance and repair work. Never perform maintenance work on the PUR hot melt adhesive laminating machine with flooded floors or in very humid environments.
9. Safety gloves, goggles and long-sleeved overalls must be worn when maintaining and repairing the PUR hot-melt adhesive compound machine to avoid body parts being burned by high-temperature liquid hot-melt glue or burned by high-temperature component surfaces.
10. When loosening or installing the pressure joint, it must be confirmed that the pressure of the pressure source for the PUR hot melt adhesive compound machine has been reduced to zero.
11. When cleaning the PUR hot melt glue tank, avoid using fireworks or sharp hard tools to avoid scratching the Teflon non-stick coating inside the glue tank.
12. If air pressure or PUR hot melt adhesive compound machine leakage occurs, do not continue to use the PUR hot melt adhesive compound machine, first stop the PUR hot melt adhesive compound machine, cut off the power supply, and reduce the operating pressure to zero value and then overhaul.
Post time: May-11-2023
