In daily life, composite packaging bags can be seen everywhere. The packaging bags used to hold snacks, candy and biscuits are all packed with composite plastic bags. Many food manufacturers often have the reason that the bags are separated into layers when using composite bags. Today, I'll help you to analyze why these bags have the phenomenon of separation.

一：材料不行引起的離層

1： Separation layer caused by material failure

很多生產廠家以為所有袋子的材料都是一樣的，其實不是這樣的，對于產品的不同特性要求包裝袋的材料是不一樣的，有些產品油份大，有些產品需要進行高溫處理，有些產品需要低溫冷藏，所以袋子的材料選用不對造成的離層是很普遍發生的。

Many manufacturers think that the materials of all bags are the same. In fact, they are not. For different characteristics of products, the materials of packaging bags are different. Some products are rich in oil, some products need high temperature treatment, and some products need low temperature refrigeration. Therefore, the separation layer caused by improper selection of bag materials is very common.
 

二：復合技術不過關引起的離層

2： Separation layer caused by unqualified composite technology

復合塑料袋就是把二層以上的材料組合在一起做成的包裝袋，我們稱為：復合袋。這些材料都是通過特殊的工藝把這些材料粘合在一起的，如果技術不過關，在復合的過程中膠水用的多或者少都會影響到以后袋子的離層情況。

Composite plastic bag is the packaging bag made by combining more than two layers of materials. We call it composite bag. These materials are bonded together by special technology. If the technology is not up to standard, more or less glue will affect the separation of the bag in the future.

三：復合后熟化時間不夠

3： The curing time after compounding is not enough

復合袋復合過后需要把復合好的材料放到一個恒溫50度的一個環境去進行烘烤，烘烤的時間要達到48個小時，烘烤的目的就是為了把復合過程中的膠水烘烤干。有些生產廠家為了減少生產的時間，烘烤的時候不到就提前拿出來做袋子了，這樣的袋子在過一段時間以后袋子一定會出現離層的情況的。

After the composite bag is compounded, the composite material needs to be baked in an environment with a constant temperature of 50 degrees. The baking time needs to reach 48 hours. The purpose of baking is to dry the glue in the process of compounding. In order to reduce the production time, some manufacturers take out the bags in advance before baking. After a period of time, the bags will be separated.