The plastic enters the plastic extruder through the feeding system. Thermoplastic sheets (such as HDPE, PP, etc.) are extruded. The prefabricated sheets (such as HDPE or PP) are heated to a softening temperature of 100°C-250°C by an electric heating plate or infrared heater to ensure that the material is evenly heated. Then, the softened sheet is placed between the molds. The plastic pallet molding machine applies high pressure of 10-50 MPa to make the sheet fit the mould shape. The mold is usually made of high-strength steel or aluminum alloy and is designed with the pallet's reinforcement ribs and structural features to ensure the finished product's precise shape. After the pressing, the pallet is hardened and shaped in the mold by natural or water cooling/air cooling. Then, the de-mould and the finished product are obtained.

This process is a compression molding process with very low requirements for raw materials and their impurities. It is suitable for a wide variety of raw materials, and does not require cleaning and filtering or granulation. It only needs to sort the recycled waste plastic from the large metal particles. After sorting, the waste metal can be recycled. Other plastics can also be made into products directly. Therefore, compression molding can reduce energy consumption, does not discharge wastewater and impurities, and is energy-saving and environmentally friendly.

After the finished product is demoulded, the tray needs to be trimmed to remove excess materials, and the dimensional accuracy, surface quality and mechanical properties are tested to ensure quality. The entire hot pressing process is efficient and has a high utilization rate of raw materials. The scraps can be recycled and reused, which reduces production costs.