Flat lamination pur adhesive is a pur hot melt adhesive specially developed for the composite lamination process of panels, similar to the “sandwich” multi-layer style. Pur hot melt adhesive is a moisture-curing reactive polyurethane hot melt adhesive. After heating, liquefaction, and cooling, it chemically reacts with water in the air to produce curing bonding force.
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Flat lamination pur adhesive is used to bond different materials on the surface of the board to improve the appearance and practicality of the board. Plane flat laminating pur adhesive is commonly used in furniture factories, door factories, decorative board factories, new material factories, wallboard factories, floor factories, etc.
Pur hot melt adhesive has good adhesion to materials with smooth surfaces, such as stainless steel, aluminum, leather, rubber, etc. At the same time, it can also form good adhesion to porous materials, such as wood, ceramics, foam, etc., and has a very wide range of uses. For bonding smooth and porous materials to each other, it can have a strong cohesive force, which is an extremely important advantage of Pur flat laminating adhesive.
The boards commonly bonded by flat lamination Pur adhesive include: MDF board, particle board, calcium silicate board, SPC board, plywood, melamine board, carbon crystal board, aluminum honeycomb board, acrylic board, fireproof board, etc.
Common veneer materials for flat laminated Pur adhesives include: PVC film, PET film, PE film, veneer, leather, paper, aluminum foil, etc.
Compared with EVA hot melt adhesive, water-based adhesive, and solvent-based adhesive, the advantages of flat laminating pur adhesive are:
100% solid content, high viscosity, easy to apply.
Fast setting time, the glue can solidify after a few minutes after being applied to the board.
Solvent-free, environmentally friendly to people and the social environment.
Can be used for materials that are difficult to bond, with high bonding strength.
Excellent water resistance, high and low-temperature resistance, and solvent resistance.
Pur hot melt adhesive is an environmentally friendly adhesive. Pur hot melt adhesive is a single-component, hot melt curing adhesive that does not contain organic solvents. The raw materials do not contain pollutants, and long-term contact will not harm the human body. It complies with ROHS and halogen-free testing standards. No harmful gases or residues will be generated during use. It is green, environmentally friendly and renewable, and meets international environmental standards.
Flat laminating pur hot melt adhesive is waterproof. After being heated at high temperature, Pur hot melt adhesive will react with water in the air to form a solid adhesive film protective layer, thereby preventing water from penetrating into the board. The excellent waterproof performance of Pur hot melt adhesive is due to the chemical reaction characteristics of the glue itself.
The waterproof performance of Pur hot melt adhesive is usually evaluated by soaking the board in water. Boards with good sealing performance can be immersed in water for more than 10 hours without abnormalities. Because of the excellent waterproof performance of Pur hot melt adhesive, the durability of the board in a humid environment is improved.
It should be emphasized that Pur hot melt adhesive waterproofing is different from Pur board waterproofing. Pur hot melt adhesive can be waterproof, but the board after Pur bonding needs to achieve a waterproof effect, which is crucial for the processing of the board. To achieve a waterproof effect on the board, it is necessary to ensure that the surface of the board after bonding is not damaged and the gap between the glue and the board is fully filled.
When using flat laminating pur adhesive, the glue needs to be heated to 130-150°C through a melting device, and then the glue is evenly and evenly applied to the surface of the board using a roller. Then, a pressure wheel is used to press the veneer material tightly onto the board to complete the bonding.
This problem may be caused by the following factors:
1. Board problems (board moisture content is too high, board surface is contaminated, board is uneven, board temperature is too low).
2. Glue has poor high and low-temperature resistance.
3. Wrong process parameter settings (uneven glue application, insufficient roller pressure, uneven roller pressure, insufficient open time).
4.The operating environment humidity and temperature are too low.
5. The expansion coefficient of the veneer material is very different.
This problem may be caused by the following factors:
1. Plate problems (plate bending or deformation, uneven plate surface).
2. Glue viscosity is too high or too low.
3. Wrong process parameter settings (gluing temperature and speed do not match, roller pressure is uneven, and the pressing open time is too long).
4. Equipment and operation abnormalities (uneven glue application, conveyor belt slippage causes misalignment of the plate and material).
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5. The difference between the operating environment temperature and humidity is large (such as low ambient temperature and high humidity, which causes internal stress on the plate surface and pulls the veneer material against each other).
6. The expansion coefficient of the plate and the veneer material are very different.
This problem may be caused by the following factors:
1. Pur adhesive is incompatible with veneer materials.
2. The moisture content of the board is too high.
3. The process parameters are set incorrectly (the sol temperature is set too low, and the pressing open time is too long).
4. The ambient temperature and humidity at the operating site are too low, and the glue cannot be cured.
1. Explain the boards and materials that need to be flat-laminated to the glue supplier.
2. Explain the lamination speed of the production line to the glue supplier to ensure that the development time of the glue can match the production process.
3. Communicate the ambient temperature and humidity of the operation site and provide the appropriate version of glue (conventional version, summer version, winter version).
4. Understand the glue supplier’s flat-laminated application experience, service level, product stability, environmental protection test report, etc.
5. The next step is the product price. But the lower the price, the better, which is related to the product performance and stability of the glue.
Industry Focus: In the core process of furniture panel manufacturing—precisely bonding decorative paper or PVC film to MDF (medium-density fibreboard), particleboard, and plywood substrates to achieve efficient production and perfect surface finishes—the choice of laminating processes is undergoing significant transformation. Recently, cold laminating technology (Cold Laminating) has gained traction in the industry due to its notable efficiency and cost advantages, posing a strong challenge to the traditional PUR (moisture-curing reactive polyurethane) hot-melt adhesive lamination process.
Core Advantages Drive Surge in Demand for Cold Laminating Machines
The core of cold laminating technology lies in its unique bonding mechanism that does not require high-temperature heating. This directly translates into multiple competitive advantages, perfectly aligning with the furniture manufacturing industry's urgent need to enhance efficiency and reduce costs:
1. Lightning-Fast Speed: By eliminating the need for hot-melt adhesive heating, melting, and cooling/curing time, cold laminating machines can achieve faster production cycles, significantly improving equipment utilisation rates and over all factory capacity.
2. Energy-saving pioneer: By completely eliminating the high energy consumption requirements of large heating devices (such as glue pots and rollers), cold laminating machines significantly reduce factory electricity costs, aligning with green manufacturing trends.
3. Cost optimiser: Not only do they save electricity, but cold laminating adhesives typically offer better price competitiveness, and the equipment requires relatively simple maintenance (no high-temperature component cleaning or hot melt adhesive carbonisation issues), resulting in significantly reduced overall operational costs.
4. Substrate-Friendly: Low-temperature operation (typically ≤60°C) avoids the risk of warping, deformation, or surface damage to heat-sensitive substrates (such as certain specially treated particleboard or thin MDF), expanding the range of applicable materials.
5. Environmental Improvement: Reducing high-temperature work areas helps improve the workshop working environment.
Cold Laminating vs. PUR: Key Process Comparison
Application focus: efficiently creating perfect surfaces
As industry practice emphasizes, cold laminating technology is particularly suited to the efficient production of furniture panels with high demands on decorative surface effects. By means of a precisely controlled pressure system, the cold laminator ensures a perfect fit between the decorative paper or PVC film and the substrate (MDF, chipboard, plywood) with no air bubbles, no wrinkles, high gloss or precise texture reproduction, and an excellent surface quality of the finished product.
Industry outlook: cold laminating to establish the mainstream position, PUR to hold on to high-end areas
Industry experts generally believe that the maturity and promotion of cold laminating technology is reshaping the furniture panel laminating market pattern. Its unparalleled efficiency, energy-saving features and comprehensive cost advantages, so that it has become a high-volume, standard and high-end furniture panel production process of choice, equipment purchasing enthusiasm continues to rise.
At the same time, PUR laminates, with their ultimate resistance (to heat, humidity and chemicals) due to their nearly irreversible chemical bonding, continue to have irreplaceable core value in the high-end segment where extreme durability is required(e.g., kitchen and bath furniture, lab countertops, outdoor furniture components).
Conclusion:
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