济南塑料袋：影响包装袋透明度因素有哪些？
真空包装是我们生活中比较常见的气密性容器，那么我们都知道真空包装袋一般是呈透明状的，但也会由于各种因素导致透明度的质量。今天就由塑料包装厂的小编来为您讲一下有关影响真空包装袋透明度的因素都有哪些吧？
Vacuum packaging is a relatively common airtight container in our life, so we all know that vacuum packaging bags are generally transparent, but the quality of transparency can also be caused by various factors. Today, let's talk about the factors that affect the transparency of vacuum packaging bags?
一、配胶上的问题
1、 Problems in dispensing
不适当的配胶程序将导致主剂与固化剂不能充分混合均匀。可能产生“胶粒”现象。
Improper glue preparation procedure will lead to insufficient and uniform mixing of main agent and curing agent. "Glue particles" may occur.
二、胶黏剂本身颜色深
2、 The adhesive itself is dark
胶黏剂本身颜色太深，深黄色、黄红色，有时甚使酱油汤那样的暗红色，留在胶膜上也是相应的颜色。因此，在要求高透明度的场合下，要选用微黄色甚无色的高透明度的胶黏剂。
The color of the adhesive itself is too dark, dark yellow, yellow red, sometimes even dark red like soy sauce soup, which is also the corresponding color left on the film. Therefore, when high transparency is required, a yellowish or even colorless high transparency adhesive should be selected.
塑料袋
塑料袋
三、基材的透明度问题
3、 Transparency of substrate
内层基材表面呈现“鲨鱼皮”、“流道痕”、晶点等表观质量问题时，将严重影响复合产品的透明度。印刷时转移到非图文部分的雾状油墨版污，也明显影响复合膜的透明度。
The transparency of the composite product will be seriously affected when the surface of the inner substrate presents "shark skin", "runner mark", crystal point and other apparent quality problems. The haze ink contamination transferred to the non graphic part during printing also significantly affects the transparency of the composite film.
四、烘道温度设定不当
4、 Improper setting of drying tunnel temperature
一开始进入烘道时的温度太高，干燥太快，使胶液层表面的溶剂迅速蒸发，造成表面层胶液浓度的局部提高，表面结皮，当热量深入到胶液层内部后，皮膜下面的溶剂汽化，冲破胶膜，形成火山喷口那样的环状物，一圈一圈的，也使胶层不均匀，也称“橘皮状”。因此烘道温度自入口到出口处应逐步提高，由低到高，有一个梯度，让溶剂有秩序地连续地由内部向外部蒸发。另外，上胶量过大时，胶层在干燥过程中也相对容易产生上述胶层缺陷。
At the beginning, when entering the drying tunnel, the temperature is too high and the drying is too fast, which makes the solvent on the surface of the glue layer evaporate rapidly, resulting in a local increase in the glue concentration on the surface layer and skin formation on the surface. When the heat goes deep into the glue layer, the solvent under the film vaporizes and breaks the glue film, forming rings like volcanic vents. Circle by circle, it also makes the glue layer uneven, also known as "orange peel". Therefore, the temperature of the drying tunnel should be gradually increased from the inlet to the outlet, with a gradient from low to high, so that the solvent can evaporate from the inside to the outside in an orderly and continuous manner. In addition, when the glue amount is too large, the glue layer is relatively easy to produce the above glue layer defects during the drying process.
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