Artificial selection of hot melt adhesive sealing plate
Date：2019.12.23
Hot melt adhesive sealing (Edgebanding Hot-MeltAdhesive) are a class dedicated to the man-made sheet edge adhesive, which is a solvent-free thermoplastic rubber. Hot melt adhesive is heated to a certain temperature, i.e., change from a solid to a molten state, when applied to a substrate or sealing material surface plywood cooled into a solid, the sealing material and the substrate are bonded together. On the selection and use of hot melt adhesive sealing, must pay attention to the following aspects:
1, hot melt edge of the base material
Hot melt adhesive sealing by the base material can be divided into three categories:
(1) EVA (ethylene - vinyl acetate copolymer resin)-based hot melt adhesive material, which adhesive can be divided into two types of filler and no fillers. The use of EVA as the base material is the most common hot melt edge production technology, its major limitation is the poor heat resistance. EVA hot melt adhesive sealing with the furniture of the ambient temperature must not exceed 120 ℃;
(2) POLYAMIDE (polyamide) based hot melt adhesive material, which adhesive has good heat resistance and fast curing characteristics, the main drawback is expensive.
(3) HMPU (polyurethane) adhesive base 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, requires a special use.
2, the viscosity of hot melt adhesive sealing
The viscosity of hot melt adhesive sealing glue does not directly reflect the performance is good or bad. Generally, the higher the viscosity of melt sealing, the initial adhesive strength which is better, but worse coating properties. Low viscosity hot melt glue smaller, better wetting properties. Some low viscosity fast curing hot melt adhesive, there may be a high initial adhesive strength.
The poor quality of particleboard, sealing need to use high viscosity hot melt adhesive, it is because of the high melt viscosity, poor mobility, a low viscosity adhesive is not as easy to melt into the pores of the side portions Particleboard , so that the adhesive can be fully applied to the sheet edge.
3, the density of hot melt adhesive sealing
The density is generally in hot melt edge 0.95-1.6g/cm 3, the density depends on the number of filler (filler, the more the greater the density). As the panel edge gluing time required to achieve a certain area, so the density of unfilled hot melt glue unit length is less than the amount of a filler melt. And because no filler is preferably hot melt adhesive properties, to achieve the same sealing effect without the use of the filler is less than a hot melt adhesive packing is possible. To reduce the amount of adhesive, sealing machine must have a good coating system.
4, edge softening point and melt temperature
Softening point is a hot melt adhesive sealing heat resistance index, the higher softening point, the less likely melt adhesive edge. While also softening point temperature performance measure furniture is an important aspect. In Europe, the heat resistance of the sheet edge detection method has been set, the heat resistance of the furniture is made of the standard. France, Germany and Italy have been no large-scale production of low softening point of hot melt adhesive sealing, but the domestic manufacturers (including Taiwan manufacturers) are still produced and supplied to the domestic market because of the domestic furniture manufacturers and consumers are right furniture , especially the heat resistance of kitchen furniture is not enough attention. EVA hot melt adhesive softening point range is generally between 90-135 ℃.
The use of hot melt adhesive sealing temperature is the glue roller edge gluing machine temperature, and only at this temperature, the hot melt adhesive in order to achieve optimal strength. Displayed on the unit in a number of sealing temperature and the actual temperature has a large error, a proof temperature of the machine on a regular basis. High temperature sealing machine, glue will appear charring, smoke phenomenon; too low will make the adhesive strength.
5, the opening hours of hot melt edge banding machine and feed rate
The opening hours of hot melt adhesive sealing means sealing machine from the beginning to the Edge glue stick to the substrate with pressure for some time before, opening hours with the plastic types differ. Edge banding machine feed rate and opening hours are closely related, both in the selection and use of hot melt adhesives are very important. Rapid feed edge banding machine must choose a short opening hours of hot melt adhesive, and vice versa, then select long open time hot melt adhesive.
For most manual edge banding machine, the workers manually, which requires that the opening hours with hot long enough to bend parts at right edge. Hot melt adhesive coated on the Edge bring general, in order to ensure sealing quality, hand-made sealing machine which uses the double-sided adhesive approach. Manual sealing machine plastic cans temperature is controlled at below 180 ℃ (Germany BRANDT manual edge banding machine can be heated to above 200 ℃), so use temperature below 180 ℃ hot melt adhesive. If the manual sealing machine seal 0.2mm thick or less thin PVC, then the use of hot melt adhesive temperature must be at about 120 ℃.
For automatic or semi-automatic edge banding machine, edge banding tape through the substrate and the adhesive and pressed against the post, will soon be carried out on the edge with the tip cut off, top and bottom trimming and polishing machining, Edge with these processes to subjected to mechanical cutting force, it requires hot melt adhesive with short open time and high tack strength. Especially for thicker edge materials (such as thick solid wood edge strips), because the cutting force is large, if the hot melt adhesive tack strength is not enough, plates and sealing between bands will crack. In general, the domestic use automatic edge banding machine feed speed 8-25m/min between the use of hot melt adhesive sealing temperature of about 200 ℃.
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