Aluminum-plastic plate surface blister is the core plate extrusion with granular, the average diameter of these melts to a certain extent, will be protruding the surface of the core plate, the composite will cause the plate surface bubble phenomenon. When we peel off the aluminum plate, we find that in the bubble around there are signs of poor adhesion, the reason for this is that the bubble in the roll-pressure compound, the air around the bubble can not be completely squeezed out and sandwiched in the middle of the plate layer, the very thin air layer blocked the full adhesion of the plate layer. These may be other impurities mixed with plastic particles, or they may be mixed with other plastic particles, the melting point of these plastics is far higher than polyethylene, in the screw can not be dissolved in the stainless steel wire mesh side, when the aggregation to a certain extent will cause the extrusion back pressure, so that the top broke the filter net was squeezed together to create a core Ban bubble. If the particle size of the melt is too large, it is possible to card in the die, so that the extruded core plate surface to form a deeper impression, but also the quality of the plate surface problems.
For the production of thin plastic sheet, the use of a certain number of multi-layer stainless steel wire mesh filter is necessary, for aluminum-plastic core plate can be far smaller than the thickness of a certain aperture plate filter will not cause wear-through phenomenon, generally can solve the problem of bubbling.