What are the factors that affect the transparency of foldable bag composite film production process

　　What are the factors that affect the transparency of foldable bag composite film production process

　　A: the technology in question. A. oven temperature is too high or the import temperature gradient, the inlet temperature is too high, dry too fast, the glue layer on the surface of the solvent agile transpiration, surface crust, and then when the heat to deepen glue layer, coating solvent gasification below, a breakthrough film volcano vents that ring, a circle, also make the layer opacity. The B. composite rubber roller or blade faults, a little pressure, a neutral, transparent. Too much dust, C. in ambient air, dust glue PEB road blew in the air. Stick in the adhesive layer on the surface, combined with in the two film center, there are many small, composed of opaque. D. lack of glue, blank, with small air bubbles, a mottled or opaque, should check the amount of glue, make it meet and uniform. E. rubber roller or rollers clean development.

　　Two: nozzle bag adhesive selection. Adhesive its deep color; liquidity shortage of adhesive, flattening is poor, cannot fully spreading membrane.

　　Reason three: substrate. Surface tension is not high, moisture not glue on it, after a boring film is not uniform, one point one, commonly known as "pock marked face film".

　　Four: viscosity of adhesives. The adhesive has the close relation to the practice was moist and sticky material viscosity, low viscosity and good fluidity, is conducive to the practice of moisture.

　　Stuck to the substrate surface treatment. The appearance of any material with adsorption, in order to get the best bonding effect, any substrate surface are necessary for surface treatment. Soft packaging complex process, generally think that as long as the corona treatment on the substrate can be, in practice we should also include the appearance of cleanliness, surface roughness.

　　Five: internal stress. In the composite bonding process, the internal stress is one of important factors, bond strength and durability in the composite process, therefore, it is necessary to take effective measures to reduce the internal stress of the corresponding. But in the specific operation more difficult, it should use internal stress is small. The internal stress include reduced stress and heat stress.

　　Six: adhesive layer thickness. The thickness of the adhesive layer has a close relationship with the composite strength. The general rule is: to ensure that no shortage of adhesive strength with the circumstances, reduce the composite layer thickness increases. The layer is too thick or too thin, layer of bubble gum or lack of fault probability will be increased. Because the adhesive thickness, adhesive and the base material coefficient of thermal expansion is not the same, caused by thermal stress, resulting in the composite strength decrease, of course, the layer is too thin will be caused by lack of glue and the composite strength reduction.