Material composition of stand-up pouch zipper bag

Now more and more places are using self-supporting zipper bags, especially for food, such as dried fruit packaging bags, laundry detergent self-supporting bags, etc. So what materials are mainly used for self-supporting zipper bags? 1. Polyethylene (PE) Polyethylene is a high molecular polymer of ethylene and is a thermoplastic. Polyethylene is a milky white waxy solid, which is lighter than water, softer, good in water resistance, low temperature resistance, odorless and non-toxic. Poison, by 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, odorless, high transparency, mechanical properties, surface strength, friction resistance, chemical resistance, The moisture resistance is very good; the impact resistance value is large when the temperature is above room temperature, the raw material of polypropylene is widely sourced, the price is cheap, and the performance adaptability is wide. Widely used in the food industry, mostly used to make films and composite films, with good transparency and surface gloss, and can withstand temperatures of 120 degrees; it can be made into packaging boxes, blow molded into plastic bottles, and some fillers can be added to make certain some machine parts, etc. 3. Polystyrene (PS) Polystyrene is a colorless, transparent, non-ductile thermoplastic; non-toxic, odorless, odorless, good in coloring, and its moisture permeability is greater than that of polyethylene, its moisture absorption is very low, and its size Stable, with good gloss; good processing performance, low cost; mechanical properties increase with the increase of molecular weight; low temperature resistance, can withstand—Low temperature of 40 °C; good indoor aging resistance; good resistance to alcohol organic solvents and mineral oils, and good acid and alkali resistance. Due to its superior performance, low price and wide application, polystyrene can be made into films and containers, and is widely used in the food industry; its shrinkage rate can reach 60-70, and it is a good material for shrink packaging.
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