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The raw materials for LDPE shrink film primarily consist of LDPE resin pellets, which are derived from the polymerization of ethylene under controlled conditions. LDPE (Low-Density Polyethylene) is chosen for shrink film production due to its unique properties, including flexibility, transparency, and excellent shrinkage characteristics when exposed to heat. These pellets are melted down and extruded through a flat die to form a continuous film, which is then cooled and solidified into a thin sheet.
In addition to LDPE resin, various additives may be incorporated to enhance specific properties of the shrink film. These additives can include slip agents to reduce friction, anti-block additives to prevent the film from sticking together, and stabilizers to improve resistance to heat and UV radiation. The precise formulation of these additives depends on the intended application and desired performance characteristics of the shrink film.
Factors influencing LDPE shrink film prices include the cost of raw LDPE resin, additives used, manufacturing complexity, and market demand. Prices may fluctuate based on these factors and the competitive landscape among suppliers in the industry.
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