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Polyethylene bottles and polyethylene classification

Carrie Apr 07,2019 Share this post:

Polyethylene bottles refer to medicinal plastic bottles produced from polyethylene as the main raw material. Polyethylene (PE) is a thermoplastic resin obtained by polymerizing ethylene. Industrially, copolymers of ethylene and a small amount of an α-olefin are also included. Polyethylene is odorless, non-toxic, feels like wax, has excellent low temperature resistance (minimum use temperature can reach -100~-70 °C), good chemical stability, and can resist most acid and alkali corrosion (not resistant to oxidation) Nature of acid). It is insoluble in common solvents at room temperature, has low water absorption and excellent electrical insulation.

Polyethylene bottles

Polyethylene is classified into high density polyethylene, low density polyethylene and linear low density polyethylene depending on the polymerization method, molecular weight and chain structure. Low-density polyethylene (LOW DENSITY POLYETHYLENE, LDPE) is commonly known as high-pressure polyethylene. Due to its low density and softest material, it is mainly used in plastic bags and agricultural films. High-density polyethylene (HIGH DENSITY POLYETHYLENE, HDPE) is commonly known as low-pressure polyethylene. Compared with LDPE and LLDPE, it has high temperature resistance, oil resistance, vapor permeability and environmental stress crack resistance. In addition, electrical insulation and resistance Excellent impact and cold resistance, mainly used in blow molding, injection molding and other fields. LINEAR LOW DENSITY POLYETHYLENE (LLDPE) is a copolymer of ethylene and a small amount of a high-grade α-olefin polymerized in the presence of a catalyst. The appearance of LLDPE is similar to that of LDPE, and its transparency is poor. However, it has good surface gloss, low temperature toughness, high modulus, resistance to bending and stress cracking, and good impact strength at low temperatures.

High-density polyethylene materials in polyethylene bottles are widely used in packaging containers for oral solids, capsules, tablets and the like. Low-density polyethylene is mainly used for relatively soft packaging materials such as eye drops bottles and infusion bags.

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