真空包装袋在我们日常中使用频率是非常高的，很多的家庭都会采用真空包装袋来包装食品，以达到延长保质期的目的。真空袋的材质直接影响到其保鲜性能，接下来我们就来了解一下真空包装袋的材质及特点。

Vacuum packaging bags are frequently used in our daily life. Many families will use vacuum packaging bags to package food in order to prolong the shelf life. The material of vacuum bag directly affects its preservation performance. Next, let's learn about the material and characteristics of vacuum packaging bag.

聚酯是由多元醇和多元酸缩聚而得的聚合物总称。主要指聚对苯二甲酸乙二酯（PET），聚酯（PET）真空袋它是一种无色透明、有光泽的真空袋，是以聚对苯二甲酸乙二醇酯为原料，采用挤出法制成厚片，再经双向拉伸制成的真空袋材料。真空包装袋机械性能优良，刚性、硬度及韧性高，耐穿刺，耐摩擦，耐高温和低温，耐化学药品性、耐油性、气密性和保香性良好，是常用的阻透性复合真空袋基材之一。常用做蒸煮包装的外层材料，印刷性能较好。

Polyester is the general name of polymers obtained by polycondensation of polyols and polyacid. It mainly refers to polyethylene terephthalate (PET) and polyester (PET) vacuum bag. It is a colorless, transparent and shiny vacuum bag. It is a vacuum bag material made of polyethylene terephthalate as raw material by extrusion and biaxial stretching. Vacuum packaging bag has excellent mechanical properties, high rigidity, hardness and toughness, puncture resistance, friction resistance, high and low temperature resistance, chemical resistance, oil resistance, air tightness and fragrance retention. It is one of the commonly used base materials of barrier composite vacuum bag. It is commonly used as the outer material of cooking packaging, with good printing performance.

尼龙（PA）真空袋是一种非常坚韧的真空包装袋，透明性好，并具有良好的光泽，抗张强度、拉伸强度较高，还具有较好的耐热性、耐寒性、耐油性和耐有溶剂性，耐磨性、耐穿刺性优良，且比较柔软，阻氧性优良，适于包装硬性物品，例如油腻性食品、肉制品、油炸食品、真空包装食品、蒸煮食品等。在尼龙真空袋基础上可衍生出更高性能的尼龙复合袋和多层共挤真空袋。

Nylon (PA) vacuum bag is a very tough vacuum packaging bag with good transparency, good luster, high tensile strength and tensile strength, good heat resistance, cold resistance, oil resistance and solvent resistance, excellent wear resistance and puncture resistance, soft ratio and excellent oxygen resistance. It is suitable for packaging hard goods, such as greasy food, meat products Fried food, vacuum packaged food, steamed food, etc. On the basis of nylon vacuum bag, higher performance nylon composite bag and multi-layer coextrusion vacuum bag can be derived.

真空袋：聚乙烯（polyethylene ，简称PE）是乙烯经聚合制得的一种热塑性树脂。透明较尼龙的低，声音较脆，具有优良的阻气、阻油和保香性能。不适用高温与冷藏使用，较尼龙的要便宜一些。一般用于没有特殊要求的普通真空袋材质。

Vacuum bag: Polyethylene (PE) is a thermoplastic resin prepared by polymerization of ethylene. The transparency is lower than that of nylon, and the sound is crisp. It has excellent gas resistance, oil resistance and fragrance retention properties. It is not suitable for high temperature and cold storage. The price is cheaper than that of nylon. It is generally used for ordinary vacuum bag materials without special requirements.

铝塑复合真空包装袋（PET/AL/PE 或 PET/NY/AL/PE 或 PET/NY/AL/CPP），主要成分为铝箔，不透明，呈银白色，有反光泽，具有良好的阻隔性、热封性，遮旋光性、耐高温、耐低温、耐油性、保香性；柔软性等特点。适用于化学原料、医药中间体的防潮、避光、真空包装。多采用四层结构，具有良好的隔水、隔氧功能。铝箔真空袋在食品，电子，化工等行业中广泛使用。

Aluminum plastic composite vacuum packaging bag (PET / Al / PE or PET / NY / Al / PE or PET / NY / Al / CPP), mainly composed of aluminum foil, opaque, silvery white, anti gloss, good barrier, heat sealing, optical opacity, high temperature, low temperature, oil resistance and fragrance retention; Flexibility and other characteristics. It is suitable for moisture-proof, light proof and vacuum packaging of chemical raw materials and pharmaceutical intermediates. Four layer structure is adopted, which has good water and oxygen separation functions. Aluminum foil vacuum bag is widely used in food, electronics, chemical and other industries.

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