在包裝工業(yè)發(fā)展的基礎上，物品的包裝也得到相應的發(fā)展。從簡單紙包裝，到單層塑料薄膜包裝，發(fā)展到復合材料的廣泛使用。復合膜能使包裝內含物具有保濕、保香、美觀、保鮮、避光、防滲透、延長貨架期等特點，因而得到迅猛發(fā)展。

On the basis of the development of packaging industry, the packaging of goods has also been developed accordingly. From simple paper packaging, to single-layer plastic film packaging, to the extensive use of composite materials. The composite film can make the contents of the package have the characteristics of moisturizing, fragrance preserving, beauty preserving, fresh-keeping, light avoiding, impermeability, and extending the shelf life, so it has developed rapidly.

 

復合塑料包裝袋比傳統(tǒng)包裝袋實用性要更好一些，防水性、耐熱性都要遠遠超過普通包裝袋。下面就讓我們來看看復合包裝袋的組成材料有什么吧。

 

Composite plastic packaging bags are more practical than traditional packaging bags, and their water resistance and heat resistance are far more than ordinary packaging bags. Now let's take a look at the constituent materials of composite packaging bags.

 

復合塑料包裝袋是由兩種或兩種以上塑料原材料，經過一次或多次復合工藝而組合在一起，從而構成具有特定功能的塑料復合袋。一般可分為基層、功能層和熱封層。基層主要起美觀、印刷、阻濕等作用。如BOPP、BOPET、BOPA、MT、KOP、KPET等;功能層主要起阻隔、避光等作用，如VMPET、AL、EVOH、PVDC等;熱封層與包裝物品直接接觸，起適應性、耐滲透性、良好的熱封性，以及透明性、開口性等功能，如LDPE、LLDPE、MLLDPE、CPP、VMCPP、EVA、EAA、E-MAA、EMA、EBA等。

 

Composite plastic packaging bag is a plastic composite bag with specific functions, which is composed of two or more plastic raw materials through one or more composite processes. Generally, it can be divided into base course, functional layer and heat sealing layer. The base course mainly plays the role of aesthetics, printing, moisture resistance, etc. Such as BOPP, BOPET, BOPA, MT, Kop, kpet, etc; The function layer is mainly used to block and avoid light, such as VMPET, Al, EVOH, PVDC, etc; The heat sealing layer is in direct contact with the packaging, which has the functions of adaptability, permeability resistance, good heat sealing, transparency, openness and so on, such as LDPE, LLDPE, mLLDPE, CPP, VMCPP, EVA, EAA, e-maa, EMA, EBA, etc.

復合塑料包裝袋所牽涉的原材料種類較多，性質各異，哪些塑料材料可以結合或不能結合，用什么東西黏合等，問題比較多而復雜，所以必須對塑膠袋原材料精心選擇，方能獲得理想的效果。選擇的原則如下：

 

There are many kinds of raw materials involved in composite plastic packaging bags, with different properties, which plastic materials can be combined or not, and what things are used to bond, etc. there are many and complex problems, so we must carefully select the raw materials of plastic bags in order to obtain the ideal effect. The recommended selection principles are as follows:

 

A、明確包裝對象和要求;

 

A. Specify the packaging object and requirements;

 

B、選用合適的塑料原材料和加工方法;

 

B. Select appropriate plastic raw materials and processing methods;

 

C、采用恰當?shù)恼澈蟿┗驅雍显稀?/div>