As manufacturers have increasing requirements for high-quality furniture and production efficiency, many furniture manufacturers will encounter the problem of choosing PUR edge banding hot melt adhesive during the transformation process. This article will share the nature and practical applications of Pur hot melt adhesive, which I believe will enlighten everyone in the future when choosing Pur edge banding hot melt adhesive.
What is PUR hot melt adhesive
Pur hot melt adhesive is the abbreviation of Polyurethane Reactive hot melt adhesive. The bonding principle of PUR hot melt adhesive is to quickly cool after heating and melting to provide a certain physical initial strength; later, it gradually reacts chemically with water in the air for about 3-5 days and obtains extremely strong final strength. The whole process is an irreversible chemical reaction. After curing, it will not melt when heated again. Pur hot melt adhesive has excellent bonding properties and is widely used in furniture manufacturing, wood processing, packaging, books, automobiles, textiles, and other fields.
How does Pur adhesive react
Pur hot melt adhesive has chemically active urethane groups (NHCOO) or isocyanate groups (NCO) in its molecular structure. When the glue is melted by heating, it comes into contact with materials containing active hydrogen (H) such as wood, leather, paper, ceramics, glass, metal, etc., and then reacts chemically with water in the air to generate high-molecular polymers with high cohesion, thereby producing excellent bonding strength.
What is Pur edge banding hot melt adhesive
Pur edge banding hot melt adhesive is used for edge banding in furniture, cabinets, doors, windows, etc., specifically for bonding edge banding strips such as PVC, ABS, PET, acrylic, and veneer to the edges of particleboard, medium fiberboard, plywood, and aluminum honeycomb panels. Sticking edge banding strips to the edges of panels is beneficial to the overall aesthetics of the furniture, and prevents water in the air from entering the panels, thus protecting the furniture.
Why furniture manufacturers choose to use Pur edge banding hot melt adhesive
As consumers have higher and higher requirements for furniture quality, the glue line thickness, tensile force value and water resistance at the edge banding of furniture are key indicators of product quality.
Compared with traditional hot melt adhesive, Pur edge banding hot melt adhesive has excellent bonding strength with a small amount of adhesive, which can make the furniture almost without glue lines. The pur adhesive bonding process will undergo an irreversible chemical reaction, so the final bonding strength is more than 2 times greater than traditional adhesive. After the glue cools, it produces a water-proof glue layer, so excellent water resistance is one of the characteristics of Pur hot melt adhesive. It is precisely the three advantages of Pur edge banding hot melt adhesive mentioned above that have led more and more furniture manufacturers to choose to use Pur edge banding hot melt adhesive.
What are the advantages of Pur edge banding hot melt adhesive
High bonding strength
After being melted by a heating device, traditional hot melt adhesive only undergoes a physical reaction. When the temperature rises again, it can solidify again. However, Pur adhesive not only undergoes a physical reaction, but also gradually undergoes a cross-linking chemical reaction with water in the air, thereby producing a stronger bonding strength. When the temperature rises again, Pur hot melt adhesive cannot solidify again. The bonding strength of Pur edge banding hot melt adhesive is more than 2 times higher than that of traditional hot melt adhesive.
Low glue application amount
Under the same bonding material, width, thickness, and other conditions, the amount of glue required for furniture edge banding to achieve the same bonding effect is less than half of that of traditional hot melt adhesive.
No glue line
Pur edge-banding hot melt adhesive can have extremely strong bonding strength with a very small amount of adhesive. Compared with traditional hot melt adhesive, PUR hot melt adhesive can achieve the effect of no glue line, greatly improving the aesthetics of furniture.
Safety and environmental protection
The PUR edge banding hot melt adhesive does not contain any organic solvents in its ingredient list and will not release harmful gases during use. It meets the environmental protection requirements of furniture production and is deeply loved by sellers and furniture manufacturers.
Strong waterproof ability
After the PUR edge banding hot melt adhesive is completely cured, it will no longer react with water, and the adhesive film has a certain waterproof ability. During the use of furniture, it can prevent water in the air from entering the board, which is particularly suitable for use in high-humidity places such as toilets and balconies.
Good weather resistance
PUR edge banding hot melt adhesive has excellent high and low-temperature resistance, corrosion resistance, durability, etc. It can remain stable in the temperature range of -40 to 150°C and will not react secondary at high temperatures. It is particularly suitable for furniture and panels that need to withstand extreme temperature changes.
In summary, Pur edge banding hot melt adhesive has the advantages of high bonding strength, low glue application, no glue line, safety, and environmental protection, strong waterproof ability, good weather resistance, etc. It is precisely because of these advantages that Pur hot melt adhesive is increasingly favored by furniture manufacturing factories and has become a new trend in the use of glue in the woodworking industry.
What is the best adhesive for edge banding
Adhesives commonly used for furniture edge banding include EVA hot melt adhesive, PUR hot melt adhesive, water-based PVA adhesive, CA adhesive, neoprene adhesive, etc. The strength of EVA hot melt adhesive is not as good as that of PUR hot melt adhesive, the water-based PVC adhesive is not as water-resistant and strong as that of PUR hot melt adhesive, and the environmental protection, price, and production efficiency of CA adhesive and neoprene adhesive are not as good as those of PUR hot melt adhesive.
In summary, based on a comprehensive evaluation of price, environmental protection, strength, water resistance, production efficiency, etc., the best adhesive for edge banding is PUR edge banding hot melt adhesive.
How does PUR adhesive work
Place the PUR adhesive in a glue melting furnace, adjust the furnace to a suitable temperature (130-150°C), wait for the glue to melt, apply the glue to the wood or bonding material using a machine, and use a pressing wheel to press the wood and bonding material together. Place them in a moist place for 3-5 days to complete the bonding.
What color is Pur edge banding hot melt adhesive
Due to the characteristic of Pur hot melt adhesive without glue line, compared with traditional hot melt adhesive, conventional Pur edge banding hot melt adhesive only has two colors: transparent and white.
How to choose Pur edge banding hot melt adhesive
Type of board
Pur edge banding hot melt adhesive is the same as traditional hot melt adhesive. It can be used to seal the edges of wood materials such as medium-density fiberboard, multi-layer board, solid wood board, particle board, etc. You only need to consider the density of different boards and the permeability of glue. It should be noted that if you want to seal the edges of aluminum honeycomb panels, you need to use glue with better permeability and bonding strength. If you use ordinary Pur edge banding hot melt adhesive to bond aluminum honeycomb panels, it may fall off.
Types of edge banding
Pur edge banding hot melt adhesives have better material adaptability and bonding performance than other types of edge banding adhesives. It can bond conventional types such as PVC, ABS, acrylic, PET, paper, and solid wood. It should be noted that if the furniture manufacturing factory needs to bond edge banding of special materials, it needs to be tested in advance. If the test results are good, mass production can be carried out.
Types of machines
Based on the sol method, they can be divided into furnace type machines and platen type machines.
Furnace type machines: The heating part is a thick-walled circular sol furnace, usually made of aluminum alloy. The melting furnace is covered with a lid to isolate air from entering. When using, put a small package (2KG) of glue into the sol furnace to heat and melt it.
This type of machine is often used for small-scale and old machine reconstruction. It has average banding performance and is prone to air entering the melting furnace, causing the rubber hose to become clogged and damage the equipment. The market share of this type of machine is declining year by year.
Platen-type machine: The heating part is an aluminum alloy heating disc. When in use, the heating disc is pressed into the glue barrel from top to bottom, and the heating disc is located above the glue. When the heating disc is heated, only the glue on the top contacts the heating disc, causing the glue to reach the melting point. At this time, the lower part of the glue barrel is not heated, and only as much as needed is melted during production to prevent the glue from aging and deterioration due to long-term heating.
The platen press machines on the market are divided into two specifications, 5 gallons (20kg) and 55 gallons (200kg), according to the different capacities of the glue barrel. Excellent air isolation and aging resistance make the platen press machines occupy an increasingly higher share of the market.
Therefore, when furniture manufacturers choose Pur edge banding hot melt adhesive, they can choose glue based on the type of glue melting furnace and edge banding speed of the factory.
Ambient temperature
The best ambient temperature for using Pur edge banding hot melt adhesive is 15-25°C. When the ambient temperature is higher than 30°C or lower than 10°C, the open time and curing speed of the glue will be affected. When the conventional version of the glue is used at too high or too low a temperature, the edge banding strip is prone to fall off the board.
When the ambient temperature is lower than 5°C, the board and edge banding strips need to be heated, and the winter version of Pur edge banding hot melt adhesive should be used to increase the open time of the glue. On the contrary, when the ambient temperature is higher than 35°C, the temperature of the glue melting furnace can be appropriately lowered, and the summer version of Pur edge banding hot melt adhesive can be used to reduce the open time of the glue.
Price
The price of Pur edge-banding hot melt adhesive is 2-5 times higher than that of traditional hot melt adhesive, but the amount of adhesive applied is 2-3 times lower. In terms of comprehensive use cost, it is not much higher. It should be noted that some merchants use fake Pur glue to sell as real ones. The easiest way to distinguish is that the tensile strength of real Pur hot melt adhesive will gradually increase with the increase of curing time, which is about 3-5 days.
In summary, the main factors to consider when choosing Pur edge banding hot melt adhesive are: type of board, type of edge banding strip, type of machine, ambient temperature, price, etc. I believe this article will be helpful to furniture factories when choosing glue. As a Chinese manufacturer with more than 10 years of experience in Pur hot melt adhesive, Blue Rhino Adhesives can consult us if you have any questions when using glue.
