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

On the basis of the development of the packaging industry, the packaging of goods has also undergone corresponding development. From simple paper packaging to single-layer plastic film packaging, to the widespread use of composite materials. Composite films have developed rapidly due to their ability to provide moisture retention, aroma retention, aesthetics, freshness, light resistance, penetration resistance, and extended shelf life to the contents of packaging.

復(fù)合塑料包裝袋比傳統(tǒng)包裝袋實(shí)用性要更好一些，防水性、耐熱性都要遠(yuǎn)遠(yuǎn)超過(guò)普通包裝袋。下面就讓我們來(lái)看看濟(jì)南復(fù)合塑料袋的組成材料有什么吧。

Composite plastic packaging bags are more practical than traditional packaging bags, and their waterproofing and heat resistance far exceed those of ordinary packaging bags. Let's take a look at the composition materials of Jinan composite plastic bags.

復(fù)合塑料包裝袋是由兩種或兩種以上塑料原材料，經(jīng)過(guò)一次或多次復(fù)合工藝而組合在一起，從而構(gòu)成具有特定功能的塑料復(fù)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(yīng)性、耐滲透性、良好的熱封性，以及透明性、開(kāi)口性等功能，如LDPE、LLDPE、MLLDPE、CPP、VMCPP、EVA、EAA、E-MAA、EMA、EBA等。

Composite plastic packaging bags are plastic composite bags that are composed of two or more plastic raw materials and are combined through one or more composite processes to form a specific functional plastic composite bag. Generally, it can be divided into base layer, functional layer, and heat sealing layer. The grassroots mainly plays a role in aesthetics, printing, and moisture resistance. Such as BOPP, BOPET, BOPA, MT, KOP, KPET, etc; The functional layer mainly plays a role in blocking and avoiding light, such as VMPET, AL, EVOH, PVDC, etc; The heat sealing layer is in direct contact with packaging materials, providing adaptability, permeability resistance, good heat sealing performance, as well as transparency and opening properties, such as LDPE, LLDPE, MLLDPE, CPP, VMCPP, EVA, EAA, E-MAA, EMA, EBA, etc.

復(fù)合塑料包裝袋所牽涉的原材料種類較多，性質(zhì)各異，哪些塑料材料可以結(jié)合或不能結(jié)合，用什么東西黏合等，問(wèn)題比較多而復(fù)雜，所以必須對(duì)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：

Composite plastic packaging bags involve a wide range of raw materials with varying properties, including which plastic materials can or cannot be combined, and what to use for bonding. There are many and complex issues, so it is necessary to carefully select the raw materials for plastic bags in order to achieve the desired results. The recommended principles for selection are as follows:

A、明確包裝對(duì)象和要求;

A. Clarify packaging objects 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(dāng)?shù)恼澈蟿┗驅(qū)雍显稀?/div>