Composite bags what is the cause of the transparency is not good? Please see the answer!

Part of the composite bags will be very high to the requirement of transparency, but in the composite processing of plastic film, packaging bags often there will be no problems such as transparency. Then, the impact of composite bags what is the cause of the transparency? Today, the professional manufacturer of flexible packaging packaging is based on the experience to interpret composite bags transparency owe good reasons and treatment scheme. A, choice of adhesive and color with deeper colour or wrong itself such as adhesives and lack of liquidity, flow leveling function is poor, can't fully spread out in composite membrane. Generally the main rubber solid content and the higher the liquidity, the better, to spread out on the thin film. Overall, 75% of the glue is better than 50% transparent effect, 50% of the rubber is better than that of 40% or 35% of the rubber. Fit on high demand for transparency film, with 50% and 40% of the rubber compound is difficult to reach requirements. Second, composite technology problems on the primary machine drying temperature is too high, monotonous too fine adhesive solvent liquid surface active swing ( Steam) Hair, adhesive solution early appearance crust, and then after the internal heat to deepen to the adhesive solution layer, the film below solvent gasification, when the gas film break skin like volcanic gush, the circular ring, rubber not transparent. Second assumption fit dandy roll or scraper has faults, a pressure point false, constitute a space, will constitute a fit after the film is not transparent. Involved in the work environment here too much dust in the air, after the glue drying sucked through the hot air also has the dust in the tiny, sticking to the sub appearance or composite center sandwiched between two layers of basement membrane, the dust of the many opaque or transparent. Processing method: closed compound on the plastic parts, drying tunnel inlet with high mesh filter, blocking dust sucked into ( Is clear in the bake, hot air dust) 。 Other, there is no fair exhibition rubber roller or rubber roller is not clean, will make the composite membrane after not bright, or composite glue quantity is lack, uneven coating has a blank space, with the tiny bubbles and hearing the spotted or opaque. Checking and adjusting the gluing quantity, processing way: to make it on foot and uniform coating, constitute a common & other; Pockmarked face film & other; 。 Three, other problems demand note is not hot blast temperature of the composite, the hot melt glue part failed to melt, cooling roller temperature is too high, can't abrupt cooling can constitute a poor fit film transparency. Processing: hot blast temperature is not less than 70 degrees, hot melt of the colloid began to melt when the temperature reached 65 degrees, melts is not only the transparency, and compound healthy and vigorous degree also increased. Cooling roll to use chilled or frozen water circulation cooling, cooling the faster, the transparency, the better, composite film flatness, the better, healthy and vigorous degree, the better.