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What is the material composition of the self-supporting zipper bag

click:346 time:2022-10-20 edit:Hua Di's editor

When we buy food, clothes and other products, we often find that when we open them, there is another place to pull them. This is a self standing zipper bag. With it, we can easily pull them up before we finish eating food, so as to ensure the quality of food. Knowing the function of the self supporting zipper bag, do you know what material the self supporting zipper bag is made of? Will it affect our food? Let’s take a look.


1. Polyethylene (PE) is a high molecular polymer of ethylene and a thermoplastic plastic. Polyethylene is a milky white waxy solid, lighter than water, softer, water resistant, low temperature resistant, tasteless and non-toxic, according to its density. It can be divided into high-density, medium density, low-density polyethylene, and linear low-density polyethylene.


2. Polypropylene (PP) Polypropylene is a by-product of petroleum refining propylene, which is the smallest known plastic; Non-toxic, tasteless, high transparency, good mechanical properties, surface strength, friction resistance, chemical corrosion resistance, moisture resistance; When the temperature is above room temperature, the impact resistance value is large. Polypropylene has a wide range of raw materials, low price, and wide performance adaptability. It is widely used in the food industry. It is mainly used for making films and composite films. It has good transparency and surface luster, and can withstand 120 ℃ temperature; It can be made into packing boxes, blow molded into plastic bottles, and added with certain fillers to make certain machine parts.


3. Polystyrene (PS) Polystyrene is a colorless, transparent, non ductile thermoplastic; It is non-toxic, tasteless, odorless, with good colourability, higher moisture permeability than polyethylene, low moisture absorption, stable size, and good luster; Good processing performance and low cost; The mechanical properties increase with the increase of molecular weight; Low temperature resistance, can withstand – 40 ℃ low temperature; Good indoor aging resistance; It has good resistance to alcohol organic solvents, mineral oil, acid and alkali. Polystyrene is widely used in food industry due to its superior performance, low price and wide application; Shrinkage rate can reach 60~70, which is a good material for making shrink packaging.


It can be seen that the self-supporting zipper bag we usually use is very convenient for the storage of leftover food when we haven’t finished all the food. After reading the above content, do you know the material composition of the self-supporting zipper bag? I hope it will be helpful to you.


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