Is the plastic bag better of PVC or PE?

The progress of the plastic bag industry is obvious to all, and the update and iteration of production equipment and production technology cannot escape the eyes of the masses. The variety of raw materials for plastic bags is also increasing, and now there are PE, PVC, CPE, PO and other materials. So what is the difference between plastic bags produced by different materials? Which industries are they suitable for? And what are the advantages of each material? Below are the answers for you.

PE plastic bag is a high molecular organic compound formed by addition polymerization of ethylene. Polyethylene is recognized as the best material in the world for food contact. Non-toxic, tasteless, odorless, in line with food packaging hygiene standards. Polyethylene film, light and transparent, has the properties of moisture resistance, oxygen resistance, acid resistance, alkali resistance, general air tightness, and excellent heat sealability. It is one of the most widely used plastic bags for plastic packaging printing. The body of the bag is soft, but the transparency is not high enough for other materials, and it is relatively fuzzy. But the pull is good! 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 operating temperature can reach -70 ~ -100 ℃), good chemical stability, high resistance Most acid and alkali erosion (not resistant to acids with oxidizing properties, insoluble in common solvents at room temperature, low water absorption, and excellent electrical insulation performance; but polyethylene is very sensitive to environmental stress (chemical and mechanical effects), heat-resistant aging Poor properties. The properties of high-density polyethylene vary with the variety, mainly depending on the molecular structure and density. Different production methods can be used to obtain products with different densities (0.91 ~ 0.96g/cm3). Polyethylene can be formed by general thermoplastic molding methods. Processing. The bag body is brittle, the transparency is not high enough, it is more blurry than the PE material, it is a bit white, and the tensile force is not very good.

PP plastic bag, commonly known as: folded plastic. Polypropylene is a representative of polyα-olefin, a thermoplastic resin obtained by the polymerization of propylene, and its monomer is propylene CH2=CH-CH3. According to the different initiators and polymerization processes, polypropylene can be divided into three configurations: isotactic polypropylene, atactic polypropylene and syndiotactic polypropylene. 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, giving him good heat resistance and solvent resistance; at room temperature, atactic polypropylene is an amorphous, Micro-viscous white wax, low molecular weight, 3000-10000, irregular structure and lack of cohesion, less application. The bag body is hard, but the transparency is relatively high and clear, and the pulling force is not very good! Explosive mouth!

PVC plastic bags, polyvinyl chloride, plus ingredients to enhance its heat resistance, toughness, ductility, etc. The top layer of this surface film is lacquer, the main component in the middle is polyvinyl chloride, and the bottom layer is a back coating 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 can be soft or hard, and the material can be ordered according to the needs of the customer. The transparency can also be based on the needs. Because there are super transparent materials, ordinary materials and abrasive materials, the tension is good, and it is not easy to tear or explode. Mouth, because the two layers of material are beered together by a machine.

OPP plastic bags have the best, highest and most translucent transparency, which can prevent dust and improve the value of the packaged products. The products inside can be fully displayed during sales, so OPP plastic bags are usually used as outer packaging for commodity sales, which not only protects but also beautifies. Widely used in jewelry, jade, stationery, toys, tableware, kitchen utensils, clothing and other fields. The bag body is the most brittle, has the highest transparency, and has insufficient pulling force, but it is the most vulnerable to bursting. And printing is the easiest to decolorize.

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. This type of plastic bag is frosted, smooth on both sides, comfortable and soft to the touch, and has high-end packaging. It is a relatively expensive, More high-end, more luxurious packaging bags can be added