With the rapid development of the plastic packaging industry, the production technology and production equipment innovation. The variety of raw materials for plastic bags is also increasing, such as PE, PO, PP, PVC, etc. So what is the difference between plastic bags produced by different materials? Are they suitable for those industries? And what are the advantages of each material? Today, Xin Changsheng will give you a detailed analysis of the various differences in the production materials of plastic bags.
PE plastic bag is a high molecular organic compound obtained by adding ethylene. Polyethylene is recognized as the best material for food contact in the world. Non-toxic, odorless, odorless, in line with food packaging hygiene standards. Polyethylene film, light and transparent, with moisture, oxygen, acid, alkali, air tightness, heat sealing and other properties. It is one of the most widely used and widely used plastic bags for plastic packaging. The bag body is soft, but the transparency is not high. Other materials are high, and the tension is good! It is not easy to burst!
PO plastic bag, blow molded from high density polyethylene (HDPE), non-toxic, feels like wax, has excellent low temperature resistance (minimum use temperature can reach -70 ~ -100 °C), good chemical stability, high resistance Most acid and alkali corrosion (not resistant to oxidizing acids), insoluble in common solvents at room temperature, low water absorption, excellent electrical insulation properties; but polyethylene is very sensitive to environmental stress (chemical and mechanical), heat resistance Poor aging. The nature of high density polyethylene varies from species to species and depends primarily on molecular structure and density. Products of different densities (0.91 to 0.96 g/cm3) can be obtained by different production methods. Polyethylene can be processed by conventional thermoplastic molding methods (see plastic processing). The bag body is brittle, the transparency is not high enough, it is even more than the PE material, it is a little white, and the pulling force is not very good.
PP plastic bag, commonly known as: 100% plastic. Polypropylene is a representative of poly-α-olefin, a thermoplastic resin obtained by polymerizing propylene, and its monomer is propylene CH2=CH-CH3. Depending on the initiator and polymerization process, polypropylene can be classified into isotactic polypropylene and atactic polypropylene and syndiotactic polypropylene. The isotactic polypropylene is easy to form a crystalline state, the crystallinity is as high as 95% or more, and the molecular weight is between 80,000 and 150,000, which gives him good heat resistance and solvent resistance; the random polypropylene is amorphous at room temperature. The micro-band viscous white wax has a low molecular weight of 3,000-10,000, and the structure is irregular and lacks cohesion, and the application is less. The bag is hard, but the transparency is relatively high, clear, and the pulling force is not very good! Explosive!
PVC plastic bag, PVC, with added ingredients to enhance its heat resistance, toughness, and ductility. The uppermost layer of this surface film is lacquer, the main component in the middle is polyvinyl chloride, and the lowermost layer is a back-coated adhesive. It is a well-loved, popular and widely used synthetic material in the world today. Among the materials that can produce three-dimensional surface films, PVC is the most suitable material. The bag body is soft and hard. It can be ordered according to the needs of the guests. Transparency can also be used according to the requirements. Because there are ultra-transparent materials, common materials and sanding materials, the pulling force is good, it is not easy to be smashed, and it is not easy to explode. Mouth, because the two layers of material are machined together.
OPP plastic bag, the best transparency, highest, most translucent, dustproof, and enhance the value of the packaged product. In the sale can fully display the products inside, so OPP plastic bags products are usually used for the sale of goods packaging, both protection and beautification. Widely used in jewelry, jade, stationery, toys, tableware, kitchen utensils, clothing and other fields. The bag is the most brittle, with the highest transparency, insufficient pull, but the most explosive. And printing is the most easy to discolor.
CPE plastic bags are the most commonly used packaging plastic bags for electronic products, such as Ipad tablet computers, Iphone mobile phones, PSP handheld game consoles, etc. These plastic bags are frosted, smooth on both sides, comfortable and soft to the touch, high-grade packaging, and are relatively expensive. A more upscale, more luxurious bag for another product.
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