High-pressure polyethylene (LDPE) pellets are produced through a high-pressure polymerization process, which transforms ethylene gas into versatile plastic pellets. The production involves several key stages:

1. Ethylene Compression & Preheating

   • Ethylene gas is compressed to 1,500–3,000 bar and preheated to 150–300°C.

2. Polymerization

   • In tubular or autoclave reactors, free-radical polymerization converts ethylene into molten LDPE under controlled temperature and pressure.

3. Extrusion & Pelletizing

   • The polymer melt is extruded, cooled, and cut into uniform pellets (2–5 mm).

4. Additive Incorporation

   • Antioxidants or UV stabilizers may be blended for enhanced properties.

5. Packaging

   • Pellets are dried, screened, and packed for shipment.

This process yields LDPE pellets with excellent flexibility, ideal for films, coatings, and wood-plastic composites. Advanced automation ensures consistent quality while meeting environmental and safety standards.

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