PVC edge banding hot melt adhesive of choice
Edge hot melt adhesive (Edgebanding Hot-MeltAdhesive) is a class dedicated to the man-made adhesive sheet edge, it is a solvent-free thermoplastic rubber. Hot melt adhesive is heated to a certain temperature, that is, from solid state into a molten state, when the coating to the plywood substrate or the sealing surface, the cooling becomes solid, the sealing material and the substrate bonding together. On the edge of the selection and use of hot melt adhesive, must pay attention to the following aspects:
1, the edge-based hot melt adhesive material
(1) EVA (ethylene - vinyl acetate copolymer resin)-based hot melt adhesive material, which can be divided into a hot melt adhesive filler and without filler categories. The use of EVA as a base material is the most common hot melt edge production technology, its major limitation is the poor heat resistance. EVA hot melt adhesive edge of the plate with the use of furniture, ambient temperature must not exceed 120 ° C;
(2) POL YAMIDE (polyamide) base adhesives, hot melt adhesive that has good heat resistance and fast curing characteristics, the main drawback is expensive.
(3) HMPU (PU)-based hot melt adhesive material, it is the best performance of a class of hot melt adhesive, is a guarantee of high quality sheet metal edge. It is expensive, require special use.
2, the viscosity of hot melt adhesive sealing
Edge hot melt glue viscosity does not directly reflect the performance of good and bad. In general, the higher the viscosity of hot melt adhesive sealing, the initial adhesive strength, the better it is, but the coating performance worse. Low viscosity hot melt adhesive was smaller, and better wetting properties. Low viscosity, fast curing some of the hot melt adhesive, may also have a high initial adhesive strength. For the poor quality of the particleboard, edge the need to use a higher melt viscosity, it is because of the high viscosity of the melt flow is poor, unlike the low viscosity of the coating when hot melt as easily into the particleboard edge pores, so that hot melt adhesive applied to the full board edge.
3, the density of hot melt edge
Edge density of hot melt adhesive is generally 0.95-1.6g/cm 3, its density depends on the amount of filler (filler, the more the greater the density). As the plate edge, when the coating required to achieve a certain area, so no packing density of the hot melt adhesive per unit length is less than the amount of hot melt adhesive with filler. And because no filler hot melt adhesive properties better edge to achieve the same effect, without the use of hot melt adhesive filler filler than a hot melt adhesive is possible. To reduce the amount of glue, sealing machine must have a good coating system.
4, edge softening point of hot melt adhesive and the use of temperature
Edge softening point is that the heat resistance of hot melt index, the higher the softening point, the more difficult to melt hot melt edge. At the same time softening point temperature is also measured the performance of furniture is an important aspect. In Europe, for the heat resistance of sheet edge detection method has a set of furniture made of heat-resistant standards. France, Germany and Italy have no large-scale production of low softening point of hot melt adhesive edge, but the domestic manufacturers (including Taiwanese companies) are still produced and available to the domestic market because the current domestic furniture manufacturers and consumers of furniture , in particular, the heat resistance of the kitchen furniture, not enough attention. EVA hot melt adhesive softening point range is generally between 90-135 ℃.
Temperature hot melt adhesive is on the edge glue roller coating machine temperature, and only at this temperature, hot melt adhesive in order to achieve the best strength. Displayed on the unit in a number of edge temperature and actual temperature there is a large error, so the temperature of the machine regularly proofread. Edge banding machine, there would appear carbonized rubber, smoke phenomenon; too low, will make the adhesive strength decreased.
5, sealing the opening hours of hot melt adhesive and sealing machine feed rate
Edge refers to the opening hours of hot melt adhesive glue edge banding machine from the beginning to the edge attached to the substrate under pressure for some time before, opening hours with the different types of plastic and different. Edge machines and opening hours of the feed rate are closely related, both in the selection of hot melt adhesive
Selection and use are very important. Rapid feed edge banding machine must choose a short open time hot melt adhesive, on the contrary, the long hours of hot melt adhesive selected.
For most of the manual edge banding machine, due to manual workers, which requires the use of hot melt adhesive is open long enough, so that parts of the curved edge. Hot melt adhesive coating on the edge to bring the general, in order to ensure the quality of edge, edge banding machine have made manually using double-sided adhesive approach. Manual Edge Banding machine plastic tank temperature is controlled at 180 ℃ the following (Germany BRANDT Edge Banding Machine Manual can be heated to 200 ° C or more), so use with temperature below 180 ° C hot melt adhesive. If the seal on the manual sealing machine thin 0.2mm thick PVC edge banding below, then the use of hot melt adhesive temperature must be at 120 ° C or so.
For automatic or semi-automatic edge banding machine, due to the substrate and the edge of the paste through the adhesive and pressure, the soon to be on the edge of the cut ends, upper and lower trimming and polishing and other machining, edge banding to these processes withstand the mechanical cutting force, so they requested that a short open time hot melt adhesive and a high initial adhesive strength. Especially for the thicker edge material (such as the thick solid wood edge), the cutting force as big, if the initial hot melt adhesive strength is not enough, between the plate and edge band will be cracking. In general, the domestic use of automatic edge banding machine feed speed 8-25m/min between the use of hot melt adhesive sealing temperature about 200 ℃.
