复合包装袋的主要生产工艺

来源：/ 日期：2024-03-13

复合包装袋的基本制备工艺是：印刷、复合、分切、制袋四个步骤，其中复合和制袋两道工序是影响终成品使用性能的关键工艺。

The basic preparation process of composite packaging bags includes four steps: printing, lamination, slitting, and bag making. Among them, lamination and bag making are the key processes that affect the performance of the final product.

复合工艺

Composite process

设计产品的包装工艺时，除了对各种基材的正确选择外，对复合用黏合剂的选择也关重要，要根据产品的用途、构成、后加工条件、质量要求品质等进行选择。如选错胶粘剂，无论复合加工技术多么完善，也会引起粘结不良、以及后加工中的粘结力低下、复合不牢、漏液、破袋等故障的发生。

When designing the packaging process of a product, in addition to the correct selection of various substrates, the selection of composite adhesives is also crucial. The selection should be based on the use, composition, post-processing conditions, quality requirements, and other factors of the product. If the wrong adhesive is selected, no matter how perfect the composite processing technology is, it can also cause poor bonding, as well as low bonding force, weak bonding, liquid leakage, bag breakage and other faults in post processing.

对日化软包装用胶粘剂的选择要考虑多种因素，一般来说， 作为复合胶应满足下条件：

The selection of adhesive for daily chemical flexible packaging should consider multiple factors. Generally speaking, as a composite adhesive, the following conditions should be met:

①；

① Non toxic;

②包装液体后无有害萃取物出现；

② No harmful extracts appear after packaging the liquid;

③适用食品贮存的温度要求；

③ Applicable temperature requirements for food storage;

④耐候性好，不发黄起泡，不粉化脱层；

④ Good weather resistance, no yellowing or foaming, no powdering or delamination;

⑤耐油、香精、醋和酒精；

⑤ Resistant to oil, essence, vinegar and alcohol;

⑥不侵蚀印刷图案油墨，并对油墨有较高亲和力。

⑥ It does not corrode printing pattern ink and has a high affinity for ink.

另外柔软性、可操作性、粘力持久性、抗介质侵蚀性和卫生性等也是不容忽视的。就抗介质侵蚀性而言，内容物中含有香辛料，醇、水、糖、脂肪酸等，其特性各异，极有可能透过复合膜内层渗入胶层，引起腐蚀破坏作用，导致包装袋脱层、破裂以致失效。为此，胶粘剂必须具有抵御上述物质侵蚀的能力，始终保持足够的黏接剥离强度。

In addition, softness, operability, durability of adhesion, resistance to medium erosion, and hygiene and safety cannot be ignored. In terms of resistance to medium erosion, the contents contain spices, alcohols, water, sugars, fatty acids, etc., which have different characteristics and are highly likely to penetrate into the adhesive layer through the inner layer of the composite film, causing corrosion and damage, leading to delamination, rupture, and failure of the packaging bag. Therefore, the adhesive must have the ability to resist the erosion of the above-mentioned substances and always maintain sufficient adhesive peel strength.

塑料薄膜复合加工方式有干式复合法、湿式复合法、挤出复合法、热熔复合法和共挤出复合法等几种。

There are several methods for plastic film composite processing, including dry composite, wet composite, extrusion composite, hot melt composite, and co extrusion composite.

干式复合

Dry composite

干式复合法是塑料包装复合中常用的方法。在一定温度、张力和速度等条件下，在基材上均匀涂布一层溶剂型胶粘剂（有单组分热熔型胶粘剂或双组分反应型胶粘剂），经过覆膜机的烘道（分3个区域：蒸发区、硬化区和排除异味区）让溶剂挥发干燥，再经热压辊，在热压状态下与第二基材（塑料薄膜、纸或铝箔）粘合成复合膜。

Dry lamination method is a commonly used method in plastic packaging lamination. Under certain conditions such as temperature, tension, and speed, a layer of solvent based adhesive (including single component hot melt adhesive or two-component reactive adhesive) is uniformly coated on the first substrate. The solvent is evaporated and dried through the drying path of the laminating machine (divided into three areas: evaporation zone, hardening zone, and odor elimination zone), and then bonded to the second substrate (plastic film, paper, or aluminum foil) in a hot pressing state by a hot pressing roller to form a composite film.

干式复合可以复合任意种类的薄膜，能大限度地根据内容物的不同，按目的要求做成高性能的包装材料。因此，在包装方面，特别是在日化包装方面得到了较大的发展。

Dry composite can be used to composite any type of film, and can be made into high-performance packaging materials according to the specific requirements of the content. Therefore, there has been significant development in packaging, especially in daily chemical packaging.

湿式复合

Wet composite

湿式复合法是在复合基材（塑料薄膜、铝箔）表面涂布一层胶粘剂，在胶粘剂未干的状况下，通过压辊与其他材料（纸、玻璃纸）复合，再经过烘箱干燥成为复合薄膜。

Wet composite method is to apply a layer of adhesive on the surface of the composite substrate (plastic film, aluminum foil), and then combine it with other materials (paper, glass paper) through a pressure roller before drying in an oven to form a composite film.

湿式复合法工艺操作简单、用胶粘剂少、成本低、复合效率高，并且不含残留溶剂。

The wet composite method has the advantages of simple operation, minimal use of adhesives, low cost, high composite efficiency, and no residual solvents.

湿式复合所用的覆膜机及工作原理与干式复合法基本相同，所不同的是基材涂胶后，先与第二基材碾压复合后，再经烘箱干燥。湿式复合工艺较为简单，黏合剂用量少，复合速度快，复合产品不含残留溶剂，对环境的污染较少。

The laminating machine and working principle used in wet lamination are basically the same as those used in dry lamination. The difference is that after the first substrate is coated with glue, it is first rolled and laminated with the second substrate, and then dried in an oven. The wet composite process is relatively simple, with a small amount of adhesive used, fast composite speed, and composite products that do not contain residual solvents, resulting in less environmental pollution.

挤出复合

Extrusion composite

挤出复合是复合工艺常见的一种方法，它是用热塑性树脂作为原料，树脂加热熔融进入模具，由模口流出片状固化的薄膜后，立即与另一种或两种薄膜复合在一起，然后冷却固化。

Extrusion composite is a common method of composite technology, which uses thermoplastic resin as the raw material. The resin is heated and melted into the mold, and after the solidified film flows out of the mold mouth, it is immediately combined with another or two films, and then cooled and cured.

多层共挤出复合是将多种不同性能的塑料树脂通过多以挤出机共挤，进入模具复合成膜。

Multi layer co extrusion composite is the process of co extruding multiple plastic resins with different properties into a mold to form a film.

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