In the process of panel furniture production, the selection and use of edge hot melt adhesive suitable for the specific situation of each furniture factory, not only can improve the quality and grade of panel furniture, but also can improve production efficiency, reduce the difficulty of panel renovation, and reduce the labor intensity of workers. Qingdao Xicheng Woodworking machinery has long been engaged in the technology and market work of woodworking and furniture adhesives, and the following is the panel furniture with edge sealing The selection and use of hot melt adhesive, put forward some experience and experience, hope to be helpful to the improvement of China’s panel furniture production level

Edge Banding Machine

Edgebanding Hot-MeltAdhesive (EDgebanding hot-meltadhesive) is a kind of adhesive specially used for the edge sealing of artificial sheets. It is a solvent-free thermoplastic adhesive. When the hot melt adhesive is heated to a certain temperature, that is, from solid to molten state, when it is coated to the surface of the wood-based panel substrate or edge sealing material, it is cooled into a solid state, and the edge sealing material and the substrate are bonded together. The selection and use of edge sealing hot melt adhesive must pay attention to the following aspects:

Base material for edge sealing hot melt adhesive

Edge sealing hot melt adhesives can be divided into three categories according to the base material:

  • EVA (ethylene-vinyl acetate copolymer) base material hot melt adhesive, this hot melt adhesive can be divided into two categories: filler and filler-free. The use of EVA as the base material is the most common edge sealing hot melt adhesive production technology, its main limitation is poor heat resistance. The ambient temperature of the panel furniture sealed with EVA hot melt adhesive cannot be higher than 120°c;
  • POL YAMIDE(polyamine) base material hot melt adhesive, this hot melt adhesive has good heat resistance and fast curing characteristics, the main disadvantage is expensive.
  • HMPU(polyurethane) base material hot melt adhesive, it is the best kind of hot melt adhesive, is the guarantee of high quality sheet edge sealing. It is expensive and requires special methods of use.

Viscosity of edge sealing hot melt adhesive

The viscosity of edge sealing hot melt adhesive can not directly reflect the performance of the adhesive. Under normal circumstances, the higher the viscosity of the edge sealing hot melt adhesive, the better its initial adhesive strength, but the worse the coating performance. Low viscosity hot melt adhesive has smaller amount of glue and better wettability. Some hot melt adhesives with low viscosity and fast curing speed may also have high initial adhesive strength.

For the poor quality particleboard, the edge sealing needs to choose a hot melt adhesive with higher viscosity, this is because the high viscosity hot melt adhesive has poor fluidity, and it is not as easy to enter the pores of the edge of the particleboard as the low viscosity hot melt adhesive, so that the hot melt adhesive can be fully coated on the edge of the plate.

Density of edge sealing hot melt adhesive

The density of edge sealing hot melt adhesive is generally 0.95-1.6g/cm3, and the size of its density depends on the amount of filler (the more the filler, the greater the density). Because a certain coating area is required when the plate is sealed, the unit length coating amount of filler free hot melt adhesive with small density is less than that of filler hot melt adhesive. And because of the good bonding performance of filler-free hot melt adhesive, it is possible to achieve the same edge sealing effect, and the use of filler-free hot melt adhesive is less than that of filler hot melt adhesive. In order to reduce the amount of glue, the edge sealing machine must have a good gluing system.

The softening point of the edge sealing hot melt adhesive and the softening point of the use temperature are indicators of the heat resistance of the edge sealing hot melt adhesive. The higher the softening point, the less easily the edge sealing hot melt adhesive melts. At the same time, the softening point is also an important aspect of measuring the temperature resistance of panel furniture. In Europe, there has been a set of testing methods for the heat resistance of sheet edge sealing, and standards for the heat resistance of panel furniture have also been proposed. France, Germany and Italy and other countries have not large-scale production of low softening point sealing hot melt adhesive, but domestic manufacturers (including Taiwan manufacturers) still produce and supply to the domestic market, because domestic furniture manufacturers and consumers currently do not pay enough attention to the heat resistance of panel furniture, especially kitchen furniture. The softening point range of EVA hot melt adhesive is generally between 90 and 135C. The use temperature of the edge sealing hot melt adhesive refers to the temperature of the coating roller of the edge sealing machine, and only at this temperature can the hot melt adhesive achieve the best adhesive strength. The temperature displayed on some edge banding machines has a considerable error with the actual temperature, so it is necessary to regularly check the temperature of the machine. The temperature of the edge banding machine is too high, and the glue will be charred and smoking: too low, and the adhesive strength will be reduced.

The opening time of the edge sealing hot melt adhesive and the feed speed of the edge sealing machine

The opening time of edge sealing hot melt adhesive refers to a period of time before the edge sealing machine begins to glue and presses the edge tape to the substrate, and the opening time varies with the different types of adhesive. The feed speed and opening time of the edge banding machine are closely related, and both are very important in the selection and use of hot melt adhesive. The fast feeding edge banding machine must choose a hot melt adhesive with a short opening time, and on the contrary, choose a hot melt adhesive with a long opening time.