PE and CPE products and instructions |
| Release：2021/8/13 source： author： browse：821次 |
With the rapid development of plastic packaging bag industry, the innovation of production technology and production equipment. The varieties of raw materials for plastic bag production are also increasing, such as PE, Po, PP, PVC, etc. So what's the difference between plastic bags made of different materials? Which industries are they suitable for? And what are the advantages of each material? Today, xinchangsheng will give you a detailed analysis of the differences of plastic bag production materials.
PE plastic bag is a high molecular organic compound formed by adding and polymerizing ethylene. Polyethylene is recognized as the best material in contact with food in the world. It is non-toxic, tasteless and odorless, and meets the hygienic standard of food packaging. Polyethylene film, light and transparent, with moisture-proof, oxygen resistance, acid and alkali resistance, general air tightness, excellent heat sealing and other properties. It is one of the most used and widely used plastic bags for plastic packaging and printing. The bag body is soft, but the transparency is not enough. Other materials are high, so it is more covered. The tension is good! Non explosive mouth!
Po plastic bag, blow molded from high density polyethylene (HDPE), non-toxic, feels like wax, has excellent low temperature resistance (the minimum service temperature can reach - 70 ~ - 100 ℃), good chemical stability, can resist the erosion of most acids and bases (not resistant to acids with oxidation properties), is insoluble in general solvents at room temperature, has small water absorption and excellent electrical insulation performance; However, polyethylene is very sensitive to environmental stress (chemical and mechanical action) and has poor heat aging resistance. The properties of HDPE vary from variety to variety, mainly depending on molecular structure and density. The products with different densities (0.91 ~ 0.96g / cm3) can be obtained by different production methods. Polyethylene can be processed by the molding method of general thermoplastic plastics (see plastic processing). The bag body is brittle, the transparency is not high enough, and it is more covered than PE material. It is a little white, and the tension is not very good.
PP plastic bag, commonly known as: 100% discount plastic. Polypropylene is poly α- The representative of olefins is a thermoplastic resin prepared by polymerization of propylene. Its monomer is propylene CH2 = ch-ch3. According to different initiators and polymerization processes, polypropylene can be divided into isotactic polypropylene, random polypropylene and syndiotactic polypropylene. Isotactic polypropylene is easy to form crystalline state, with crystallinity of more than 95% and molecular weight of 80000-150000, giving it good heat and solvent resistance; Random polypropylene is an amorphous, slightly viscous white wax at room temperature, with low molecular weight, 3000-10000, irregular structure, lack of cohesion and less application. The bag body is hard, but the transparency is high and clear, and the tension is not very good! Explosive mouth!
PVC plastic bag, PVC, plus ingredients to enhance its heat resistance, toughness, ductility, etc. The top layer of the surface film is lacquer, the main component in the middle is polyvinyl chloride, and the bottom layer is the back coating adhesive. It is a popular and widely used synthetic material in the world. PVC is the most suitable material for producing three dimensional surface film. The bag body is soft and hard, and the materials can be ordered according to the needs of the guests. The transparency can also be based on the needs, because there are super transparent materials, ordinary materials and sanding materials, which have good tensile force and are not easy to tear or burst, because the two layers of materials are connected together by machine.
Opp plastic bag has the best transparency, the highest transparency and the most transparent. It plays a role in dustproof and improving the value of packaged products. The products inside can be fully displayed in sales, so OPP plastic bag products are usually used as external packaging for commodity sales, which plays both a protective role and a beautifying role. It is widely used in jewelry, jade, stationery, toys, tableware, kitchen utensils, clothing and other fields. The bag body is the most brittle, the transparency is the highest, the tension is not enough, but the mouth is the most explosive, and the printing is the easiest to decolorize
CPE plastic bag is the most commonly used packaging plastic bag for electronic products, such as iPad tablet computer, iPhone mobile phone, PSP handheld game console, etc. this kind of plastic bag is frosted, smooth on both sides, comfortable and soft to handle, and high-grade packaging. It is an expensive packaging bag that can be used for other products.
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