塑料袋复合材料的基本结构有哪些？

来源：/ 日期：2023-12-28

一般来说，复合包装材料的外层材料应当是熔点较高，耐热性能好，不易划伤、磨毛，印刷性能好，光学性能好的材料，常采用的有纸、铝箔、玻璃纸、聚碳酸酯、尼龙、聚酯、聚丙烯等。

Generally speaking, the outer layer material of composite packaging materials should be a material with high melting point, good heat resistance, not easy to scratch or grind, good printing performance, and good optical performance. Commonly used materials include paper, aluminum foil, fiberglass, polycarbonate, nylon, polyester, polypropylene, etc.

内层材料应当具有热封性、粘合性好、无味、、耐油、耐水、耐化学品等性能，如聚丙烯、聚乙烯、聚偏二氯乙烯等耐热塑料材料。

The inner layer material should have properties such as heat sealing, good adhesion, odorless, non-toxic, oil resistant, water resistant, and chemical resistant, such as heat-resistant plastic materials such as polypropylene, polyethylene, and polyvinylidene chloride.

三层以上复合材料的中层通常采用阻隔气体与水分及遮敝光线等性能好且机械强度高的材料，如铝箔、聚偏二氯乙烯、玻璃纸、纸、聚乙烯等。

The middle layer of composite materials with three or more layers usually uses materials with good performance and high mechanical strength, such as aluminum foil, polyvinylidene chloride, glass paper, paper, polyethylene, etc., to block gas and moisture, and to block light.

层与层之间则涂有粘合剂用于粘合。一般外层与中层材料之间使用溶剂型热固性聚氨酯粘合剂，内层与中层之间使用改性聚丙烯乳液粘合剂或用特殊改性的含羰基丙烯共同树脂等。外层用粘合剂要求粘合强度高、工艺简单、成本低；内层用粘合剂要求耐高温、剥离强度高、、无味，不影响食品的营养成分，能很好保持食品的色香味。

Adhesive is applied between layers for bonding. Generally, solvent based thermosetting polyurethane adhesive is used between the outer layer and the middle layer, and modified polypropylene lotion adhesive or specially modified carbonyl propylene containing common resin is used between the inner layer and the middle layer. The adhesive used for the outer layer requires high bonding strength, simple process, and low cost; The adhesive used for the inner layer requires high temperature resistance, high peel strength, non-toxic, odorless, and does not affect the nutritional content of the food, which can effectively maintain the color, aroma, and taste of the food.