Introduction to PE, PO, PP, PVC, OPP, CPE plastic bags, powder-free and easy to open

With the rapid development of the plastic packaging bag industry and innovations in production technology and equipment, the raw materials for plastic packaging bags are constantly increasing, such as PE, PO, PP, and PVC. So, what are the differences between plastic packaging bags made of different materials? What industries are they suitable for? What are the advantages of each material? Today, Shunxingyuan Packaging, a professional flexible packaging manufacturer, will give you a detailed analysis of the differences between PE, PO, PP, PVC, OPP, and CPE plastic bags, and recommend various easy-to-open, powder-free plastic bags.

PE plastic bags: Made from ethylene through polymerization, polyethylene is a high-molecular organic compound and is internationally recognized as the best material for contact applications. It is non-toxic, odorless, and tasteless, meeting food packaging hygiene standards. Polyethylene film is lightweight and transparent, with properties such as moisture resistance, oxygen resistance, acid resistance, alkali resistance, moderate airtightness, and excellent heat sealing. It is one of the most widely used plastic packaging bags, extensively used for clothing bags, hardware bags, etc. The bag body is relatively soft, but the transparency is not as high as other materials, appearing somewhat hazy. It has good tensile strength and is not easily torn.

PO plastic bags: Made from high-density polyethylene (HDPE) by blow molding, they are non-toxic, have a waxy feel, and possess excellent low-temperature resistance (minimum operating temperature can reach -70～-100℃). They have good chemical stability, resisting corrosion from most acids and alkalis (except oxidizing acids). At room temperature, they are insoluble in common solvents and have low water absorption and excellent electrical insulation properties; however, polyethylene is sensitive to environmental stress (chemical and mechanical action) and has poor heat aging resistance. The properties of high-density polyethylene vary depending on the type, mainly determined by the molecular structure and density. Different production methods can yield products with different densities (0.91～0.96g／cm3). Polyethylene can be processed using general thermoplastic molding methods. The bag body is relatively brittle, the transparency is not high, appearing even hazier than PE material, with a slightly translucent white color, and the tensile strength is not very good.

PP plastic bags: Commonly known as "hundred-fold bags," polypropylene is a representative of poly-α-olefins, a thermoplastic resin produced by the polymerization of propylene (CH2=CH-CH3). Depending on the initiator and polymerization process, polypropylene can be divided into three configurations: isotactic polypropylene, atactic polypropylene, and syndiotactic polypropylene. Isotactic polypropylene easily forms a crystalline state with a crystallinity of over 95%, and a molecular weight between 80,000 and 150,000, giving it good heat and solvent resistance. Atactic polypropylene is an amorphous, slightly sticky white waxy substance at room temperature, with a low molecular weight (3,000-10,000), irregular structure, and lack of cohesion, resulting in limited applications. The bag body is relatively hard, but the transparency is relatively high and clear. The tensile strength is not very good, and it is easily torn.

PVC plastic bags: Polyvinyl chloride, with added components to enhance its heat resistance, toughness, and ductility. The top layer of this surface film is paint, the main component in the middle is polyvinyl chloride, and the bottom layer is a back-coating adhesive. It is a widely used and popular synthetic material in the world today. Among materials that can produce three-dimensional surface films, PVC is the most suitable. The bag body can be soft or hard, depending on customer requirements. Transparency can also be customized, as there are super-transparent, ordinary, and frosted materials. It has good tensile strength, is not easily torn, and is not easily broken because the two layers of material are die-cut together.

OPP plastic bags: They offer the best and highest transparency, being the most bright and clear, with the function of dust prevention and enhancing the value of the packaged product. In sales, they can fully display the products inside, so OPP plastic bags are usually used as the outer packaging for product sales, providing both protection and aesthetic appeal. They are widely used in jewelry, jade, stationery, toys, tableware, kitchen utensils, clothing, and other fields. The bag body is the most brittle, with the highest transparency, but insufficient tensile strength, making it the easiest to tear, and the printing is most prone to color fading.

CPE plastic bags are commonly used for packaging clothing and electronic products, such as tablet computers, mobile phones, and handheld game consoles. These bags have a matte and smooth surface on both sides, providing a comfortable and soft feel, suitable for high-end packaging.

The above plastic bags have been widely used in the clothing, hardware, and electronics industries. There are various types of plastic bags on the market, each with different design concepts to meet the needs of different customers. However, although these plastic bags can generally meet customer requirements, due to their formulation and manufacturing processes, most plastic bags have problems such as powder residue, difficulty in opening, and poor transparency.

Shunxingyuan Packaging, a professional flexible packaging manufacturer, has successfully made its various plastic bags possess the industry advantages of high transparency, powder-free, and easy opening through adjusting the raw material formula and reasonably optimizing the production process after multiple batch experiments. Furthermore, the various plastic bags produced by Shunxingyuan Packaging appear pure without any impurities, wrinkles, or stains, and the surface feels smooth, delicate, and has ultra-high toughness. In addition, Shunxingyuan Packaging's adhesive zipper bag production process is more advanced, with fine quality control to meet high-efficiency production.

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