What are the reasons for the poor transparency of vacuum packaging bags?

December 4, 2022

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What are the reasons for the poor transparency of vacuum packaging bags?The transparency of vacuum packaging bags is an important indicator to determine the visibility and clarity of the packaged goods, and it is particularly related to the display effect of the goods. Many plastic composite flexible packaging products require high transparency, using a large area of blank base film nylon andPEcompound, but in the dry compound process, sometimes the transparency of plastic compound flexible packaging is poor or reduced, and the quality requirements cannot be met, for example, the finished product is”foggy”,Appear”Little pockmark”,”Wavy fish scales”,”silk pattern”,”mushroom umbrella cloud”,”Dripping and splashing”Phenomena such as this affect the transparency of the composite product, and even make the composite product scrapped in severe cases. What is the reason for this? How to solve it? So in response to this kind of problem, today’s aluminum-plastic three-dimensional bag manufacturers use years of experience in bag making to discuss the problems and reasons for you:Reasons Affecting the Transparency of Vacuum Packaging Bagsone.The color of the adhesive itself is too dark, dark yellow, yellow red, and sometimes even dark red like soy sauce soup, which is also the corresponding color on the film. Therefore, where high transparency is required, a slightly yellow or even colorless high-transparency adhesive should be selected.two.Substrate transparency issues. The surface of the inner substrate presents”shark skin”,”runner marks”crystal point and other apparent quality problems will seriously affect the transparency of composite products. The foggy ink smear transferred to the non-graphic part during printing also significantly affects the transparency of the composite film.three.Problems with glue. Improper compounding procedures will lead to incomplete mixing of the main agent and curing agent. May produce”colloidal particles”Phenomenon.Four.Composite products have obvious appearance defects such as glue spots.five.The temperature of the drying tunnel is not set properly. When entering the drying tunnel at the beginning, the temperature is too high and the drying is too fast, so that the solvent on the surface of the glue layer evaporates rapidly, resulting in a local increase in the concentration of the glue on the surface, and skinning on the surface. When the heat penetrates into the inside of the glue layer, the skin film The solvent below vaporizes, breaks through the adhesive film, and forms a ring like a volcanic vent. Circle by circle, it also makes the adhesive layer uneven, also known as”orange peel”(Observed closely with the naked eye, it feels that the appearance of the composite film product is uneven like orange peel, hence the name orange peel), resulting in opacity. Therefore, the temperature of the drying tunnel should be gradually increased from the inlet to the outlet, and there is a gradient from low to high, so that the solvent can be evaporated from the inside to the outside in an orderly and continuous manner. In addition, when the amount of glue applied is too large, the above-mentioned glue layer defects are relatively easy to occur in the glue layer during the drying process.In short, the manufacturers of aluminum-plastic three-dimensional bags believe that there are many factors affecting the poor transparency of vacuum packaging bags. It is necessary to make judgments and solve them from the actual situation and appearance. To make a good product, we must start from many aspects, and take corresponding preventive measures in the absence of production.

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