PE heat shrink film is made of high-pressure polyethylene with appropriate additives through a single blow molding process. It is characterized by excellent toughness, high flexibility, good heat-sealing properties, strong impact resistance, high tear resistance, and resistance to breakage. Applications include pharmaceuticals, beverages, mineral water, beer, palletizing, building materials, metal products, dairy products, glass bottles, and other large equipment or items requiring packaging. The product can be processed into tubular film, L-folded film, and single sheets, as well as tubular bags, flat bags, and trapezoidal bags. Below, Tyst introduces relevant knowledge about PE shrink film formulations.
I. PE Shrink Film Formulation Analysis:
It is polymerized from ethylene and classified into high-density polyethylene (HDPE), medium-density polyethylene (MDPE), and low-density polyethylene (LDPE) based on density. LDPE is softer and mostly polymerized under high pressure. HDPE exhibits rigidity, hardness, and high mechanical strength, typically produced via low-pressure polymerization. HDPE can be used for containers, pipes, and high-frequency electrical insulation materials for radar and television. The most commonly used type is low-density (high-pressure) polyethylene. Polyethylene is wax-like with a smooth, waxy feel. When undyed, LDPE is transparent, while HDPE is opaque.
II. PE Shrink Film Raw Material Formulation:
Raw Material: Polyethylene.
Formulation: Polyethylene is a high polymer chain formed through the addition and polymerization of ethylene (CH2=CH2), consisting of repeating-CH2-units. The properties of polyethylene depend on its polymerization method. HDPE is produced via Ziegler-Natta polymerization under moderate pressure (15-30 atm) with organic compound catalysis, resulting in linear, long molecular chains with molecular weights reaching hundreds of thousands. LDPE, with a branched structure, is produced via free radical polymerization under high pressure (100-300 MPa), high temperature (190-210), and peroxide catalysis. The above formulation is for reference only. For a standard formulation, sample analysis is recommended.
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