When we usually buy food or clothes and other products, we often find that after we open it, there is still a place to pull it. This is a self-supporting zipper bag. It is easy to pull up to ensure the preservation of food.
Composition of self-supporting zipper bag
✦ Polyethylene (PE) Polyethylene is a high molecular polymer of ethylene, a thermoplastic, polyethylene is a milky white waxy solid, lighter than water, softer, good water resistance, low temperature resistance, odorless, non-toxic , according to its density. It can be divided into high-density, medium-density, low-density polyethylene, and linear low-density polyethylene.
✦ 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 corrosion resistance, moisture resistance The properties are very good; the impact resistance value is large above room temperature, the raw materials of polypropylene are widely sourced, the price is cheap, and the performance is widely adaptable.
It is widely used in the food industry, and is mostly used to make films and composite films. It has good transparency and surface gloss, and can withstand a temperature of 120 degrees. It can be made into packaging boxes, blown into plastic bottles, and can be made into certain fillers by adding some fillers. some machine parts etc.
✦ Polystyrene (PS) Polystyrene is a colorless, transparent, non-extensible thermoplastic; non-toxic, tasteless, odorless, good coloring, moisture permeability is greater than polyethylene, low moisture absorption, stable size , has good luster; good processing performance and 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; effective for alcohol organic solvents and mineral oil Good tolerance, acid and alkali resistance are also very good.
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; the shrinkage rate can reach 60-70, which is a good material for shrink packaging.
The above is the explanation about what material the self-supporting zipper bag is made of. After reading the introduction of the self-supporting zipper bag, I hope it will be helpful to everyone.
