Vacuum packaging influence factors of transparency

A vacuum bags transparency reasons. With glue. Not appropriate with glue program will lead to the main agent and curing agent is not fully mixing. May produce & other; Colloidal particles & throughout; Phenomenon. two Adhesive itself color too deep, deep yellow, yellow, red, sometimes even make dark soy sauce soup, on the film and the corresponding color. In demanding situations of transparency, therefore, choose high micro yellow or colorless transparent glue adhesion agent. 3. The transparency of base material. The inner base material surface rendering & other; Sharkskin & throughout; 、“ Flow mark & throughout; And the apparent quality problems such as crystal point, will seriously affect the transparency of the composite products. Transfer to the graphic part when printing ink mist version of the dirt, also significantly influence the transparency of the composite membrane. Four. Bake, improper temperature setting. A began to enter the path when the temperature is too high, dry quickly, make the glue layer on the surface of the solvent evaporated quickly, causing surface glue solution concentration of local enhancement, surface crust, after the internal heat into the glue liquid layer, under the skin membrane solvent evaporation, break through the film, forming volcanic vents that ring, a circle, also make the rubber uneven, also called & other; Orange peel shape & throughout; ( Close observation with the naked eye, feel the appearance of the composite membrane products like orange peel uneven, so the orange peel shape) , causing the opaque. Therefore baked road from the entrance to the exit temperature should be gradually rise, from low to high, there is a gradient, let solvent in order to continuously from internal to external evaporation. In addition, when the glue, rubber in the drying process is relatively easy to produce the rubber cover defects. Five. Composite finished product has obvious glue spots appearance defects.