How to choose the hot melt adhesive for the special adhesive for PVC edge banding?

Sealing Edge Hot Melt Adhesive (edgebanding hot-meltadhesive) is a kind of adhesive which is specially used for man-made plate sealing, it is a kind of solventless thermoplastic adhesive. When hot melts are heated to a certain temperature, that is, from solid state to molten state, dangtu cloth to wood-based panel substrate or sealing material surface, cooling into solid, sealing material and substrate bonding. For the selection and use of edge hot melt Adhesives, the following aspects must be noted:First, sealing edge Hot Melt Adhesive base Material(1) EVA (Ethylene-vinyl acetate copolymer resin) base material Hot melt adhesive, this kind of hot melts can be divided into filler and no filler two kinds. Using Eva as the base material is the most common hot-melt adhesive production technology, its main limitation is poor heat resistance. The use environment temperature of the panel furniture with Eva Hot melt adhesive Sealing edge can not be higher than 120°c;(2) POL yamide (polyamide) base material Hot melt adhesive, this kind of hot melts has the very good heat resistance performance and the fast curing characteristic, the main disadvantage is the expensive price.
　　(3) Hmpu (polyurethane) base material hot melts, it is the best performance of a class of hot melts, high quality plate edge guarantee. It is expensive and requires a special method of use.
　　Second, sealing edge hot melt Adhesive ViscosityThe viscosity of the sealing edge Hot melt adhesive does not directly reflect the performance of the adhesive. Under normal circumstances, the higher the viscosity of the edge hot melt adhesive, the better the initial adhesion strength, but the worse the coating performance. Low viscosity Hot Melt adhesive has a small amount of gelatinize and better wetting performance. Some of the viscosity of low curing speed of hot melts, also may have a high initial adhesion strength. For poor quality particleboard, sealing edge need to choose a higher viscosity of hot melts, this is because of high viscosity of hot melts fluidity, gelatinize is not like the low viscosity of the hot melts as easy to enter the edge of the pores of the particleboard, so that hot melts can be fully coated on the edge of the plate.
　　The density of the sealing edge Hot Melt AdhesiveThe density of the edge hot melt adhesive is generally in 0.95-1.6G/CM 3, and its density depends on the amount of filler (the more the filler, the greater the density). As a result of the plate sealing edge required to reach a certain area of gelatinize, so the density of small fillers without filler hot melts the length of the glue is less than the filler hot melt adhesive. And because there is no filler hot melts adhesive performance is good, achieve the same edge effect, no filler hot melts use less than filler hot melts is possible. To reduce the amount of gelatinize, the edge banding machine must have a good coating system.
　　IV. The softening point and the use temperature of the sealing edge Hot Melt AdhesiveThe softening point is the index of heat-resisting performance of the sealing edge, the higher the softening point, the less melting of the sealing edge hot melt adhesive. At the same time, softening point is also an important aspect to measure the temperature-resisting performance of panel furniture. In Europe, for the plate edge of the heat-resistant performance has a set of testing methods, plate furniture heat resistance also put forward the standard. France, Germany and Italy have not large-scale production of low softening point of the edge of hot melts, but domestic manufacturers (including Taiwan manufacturers) still produce and provide to the domestic market, because domestic furniture manufacturers and consumers at present on the plate furniture, especially the heat-resistant performance of kitchen furniture not enough attention. The softening point range of Eva Hot melt adhesive is generally between 90-135 ℃.
　　Hot melts the use of temperature refers to the edge of the coating roller glue on the temperature, only at this temperature, hot melts to achieve the best adhesive strength. At some edge of the machine to show the temperature and the actual temperature has a considerable error, so to regularly proofread the temperature of the machine. The sealing machine temperature is too high, will make the rubber appear carbonization, smoke phenomenon, too low, will make the adhesive strength drop.
　　V. Opening time of edge hot melt adhesives and feeding speed of edge banding machineThe opening time of the edge hot melt adhesive is the time when the edge sealing machine starts from the gelatinize to the sealing edge to the base material, and the opening time varies with the gum species. The feeding speed and opening time of the edge-banding machine are closely related, and the two are selected in hot Melt adhesivesSelection and use are very important. The fast-feeding machine must choose the hot melts with short opening time, and conversely, the hot melts with long opening time.
　　For most manual banding machines, due to manual operation of the workers, it requires that the opening time of the hot melts be long enough to seal the edges of the bending parts. Hot melts general coating in the edge banding, in order to ensure the quality of sealing edge, domestic manual edge banding machine also has a double-sided coating method. Manual sealing Machine Rubber pot temperature is generally controlled under 180 ℃ (Germany Brandt manual edge sealing machine can be heated to 200°c above), so use the temperature under the 180°c of hot melts. If the manual sealing machine is sealed with a thin PVC edge under 0.2mm thickness, the use temperature of the hot melt adhesive must be around 120°c.
　　For automatic or semi-automatic edge banding machine, because the base material and sealing strip after the gelatinize and press paste, the end of the edge of the sealing strip will be truncated, up and down trimming and polishing machine processing, the process of sealing the edge to withstand mechanical cutting force, so hot melts have a shorter opening time and high initial adhesion strength. Especially for thicker edge sealing material (such as thick solid wood sidebar), because of the cutting force is very large, if the initial adhesion strength of hot melts is not enough, the plate and banding will crack between. In general, the domestic use of automatic edge-banding machine feeding speed between the 8-25m/min, sealing edge Hot melt adhesive temperature at about 200 ℃.