Vacuum packaging is a common airtight container in our life, so we all know that vacuum packaging bags are generally transparent, but also due to various factors lead to the quality of transparency. Today, Jinan plastic bags from the small series to tell you about the impact of the transparency of vacuum plastic bags what are the factors, right?

一、配膠上的問題

1、 Problems in dispensing

不適當的配膠程序將導致主劑與固化劑不能充分混合均勻?？赡墚a生“膠粒”現象。

Improper mixing procedure will lead to insufficient mixing of main agent and curing agent. May produce "colloidal particles" phenomenon.

二、膠黏劑本身顏色深

2、 The adhesive itself is dark in color

膠黏劑本身顏色太深，深黃色、黃紅色，有時甚至使醬油湯那樣的暗紅色，留在膠膜上也是相應的顏色。因此，在要求高透明度的場合下，要選用微黃色甚至無色的高透明度的膠黏劑。

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 on the adhesive film. Therefore, in the case of requiring high transparency, we should choose yellowish or even colorless high transparency adhesive.

三、基材的透明度問題

3、 Transparency of substrate

內層基材表面呈現“鯊魚皮”、“流道痕”、晶點等表觀質量問題時，將嚴重影響復合產品的透明度。印刷時轉移到非圖文部分的霧狀油墨版污，也明顯影響復合膜的透明度。

The transparency of composite products will be seriously affected when the surface of inner substrate presents some apparent quality problems, such as "shark skin", "runner mark", crystal point and so on. When printing, the haze ink stains transferred to non graphic parts also significantly affect the transparency of the composite film.

四、烘道溫度設定不當

4、 Improper setting of oven temperature

一開始進入烘道時的溫度太高，干燥太快，使膠液層表面的溶劑迅速蒸發，造成表面層膠液濃度的局部提高，表面結皮，當熱量深入到膠液層內部后，皮膜下面的溶劑汽化，沖破膠膜，形成火山噴口那樣的環狀物，一圈一圈的，也使膠層不均勻，也稱“橘皮狀”。

At the beginning, the temperature is too high and the drying speed is too fast when entering the drying channel, which makes the solvent on the surface of the glue layer evaporate rapidly, resulting in the local increase of the glue concentration on the surface layer and the surface crusting. When the heat goes deep into the inner part of the glue layer, the solvent under the film vaporizes, breaks through the glue film and forms a ring like a volcanic vent, which also makes the glue layer uneven, also known as "orange peel".

因此烘道溫度自入口到出口處應逐步提高，由低到高，有一個梯度，讓溶劑有秩序地連續地由內部向外部蒸發。另外，上膠量過大時，膠層在干燥過程中也相對容易產生上述膠層缺陷。

Therefore, the temperature of the drying channel should be gradually increased from the inlet to the outlet, with a gradient from low to high, so that the solvent can evaporate continuously from the inside to the outside orderly. In addition, when the amount of glue is too large, the adhesive layer is relatively easy to produce the above defects in the drying process.