Generally by PEpolyethylene PPMade of polypropylene, food packaging bags. Synthetic resins are almost always used in plastics. Resin is the most important component in plastic, which acts as an adhesive and can bind other components of plastic into a whole. Although adding various additives can change the properties of plastics, resin is the fundamental factor that determines the type, performance and use of plastics.Chinese name:food bagForeign name :taker-bagMaterialPolyethylene, PVC, etc.colorMilky white translucent or colorless and transparentThe main material of the food bag is generally PEpolyethylene PPPolypropylene, Food bags are widely used in food packagingManufacturers of food bags must haveQScertificationSynthetic resinSynthetic resins are almost always used in plastics. Resin is the most important component in plastic, which acts as an adhesive and can bind other components of plastic into a whole. Although adding various additives can change the properties of plastics, resin is the fundamental factor that determines the type, performance and use of plastics. 【1】The types of resins commonly used in plastic decoration materials are:Polyethylene (PE), PVC (pvc), polystyrene (P.S.), phenolic (PF), urea-formaldehyde (UF), epoxy (EP), polyester (PR), Polyurethane (PU),Polymethylmethacrylate(PUMA), Silicone (Si)Wait.According to the changes that occur when heated, synthetic resins can be divided into thermoplastic resins and thermosetting resins.thermoplastic resinIt has the properties of softening by heating and hardening by cooling, and it does not react chemically. No matter how many times heating and cooling are repeated, it can maintain this property. All thermoplastic resins have a linear molecular structure. It includes all polymeric resins and partially condensed resins. Thermoplastic resins include: polyethylene, polyvinyl chloride, polystyrene, polyamide, polyoxymethylene, polycarbonate, polyphenylene ether, polysulfone, rubber, etc. The advantage of thermoplastic resin is that it is easy to process and shape, and has high mechanical energy. The disadvantage is poor heat resistance and rigidity.thermosetting resinAfter the resin is heated, it undergoes chemical changes and gradually hardens into shape. It will not soften or dissolve when heated again. The molecular structure of thermosetting resin is body shape, which includes most condensation resins. The advantages of thermosetting resin are high heat resistance and not easy to deform under pressure. Its disadvantage is poor mechanical properties. Thermosetting resins include phenolic, epoxy, amino, unsaturated polyester and silicone ether resins.Relevant knowledge expansion: What plastic bags can be used as food bags? (Which plastic bags can hold food)Relevant knowledge development:What is the safest material for food bagsPolyethylene is a typical thermoplastic, which is an odorless, tasteless, non-toxic, flammable white powder. FormedPEThe resins are extruded and granulated waxy granules with a milky white appearance. Its molecular weight is1just in caseloain the range of ten thousand. Molecular weight over10UHMWPEf UHMWPE3. The higher the molecular weight, the better its physical and mechanical properties, and the closer it is to the required level of engineering materials. However, the higher the molecular weight, the more difficult it is to process. The melting point of polyethylene is100-130C·It has excellent low temperature resistance. exist-60It can still maintain good mechanical properties at ℃, but the service temperature is80~110℃.