Producing LDPE shrink film involves a series of manufacturing processes designed to create a material that can shrink tightly around products when heated. Here's an overview of the typical steps involved:
Polymerization: The production process begins with the polymerization of ethylene monomers to form LDPE resin. This process involves the combination of ethylene gas with a catalyst under high pressure and temperature in a reactor. The resulting LDPE resin is a long-chain polymer with low density and excellent flexibility.
Extrusion: The LDPE shrink film manufacturers resin is then melted and extruded through a die to form a continuous film of the desired thickness. During extrusion, additives such as stabilizers, colorants, and processing aids may be incorporated into the LDPE resin to enhance its properties and performance.
Cooling: The extruded LDPE film is rapidly cooled using chilled rollers or water baths to solidify the material and maintain its shape.
Orientation: The cooled LDPE film may undergo orientation to align the polymer chains and enhance its mechanical properties. Orientation can be achieved through processes such as biaxial stretching or sequential stretching in different directions.
Heat Treatment: After orientation, the LDPE shrink film price is subjected to controlled heat treatment to relieve internal stresses and improve its shrinkage properties.
Slitting and Winding: The finished LDPE shrink film is slit into smaller rolls of the desired width and wound onto cores for storage and transportation.
Throughout the production process, quality control measures are implemented to ensure that the LDPE shrink film meets the required specifications for thickness, strength, clarity, and shrinkage performance.
