The pretreatment of different thermoplastic resins before molding is also different. For example, PP, PE, PS granular resin can be directly injection molded and extruded into products; sometimes it is necessary to add masterbatch and various functional masterbatch (such as anti-fog masterbatch). And weeding masterbatch, etc.), calcium plastic filled masterbatch and other masterbatch.
Some water absorbing resin pellets need to be dried before being formed to remove adsorbed moisture, such as Pa resin. Some powdered resins require pretreatment of seven steps: formulation design, drying, screening, refining, kneading, plasticizing, and granulation before molding. Of course, some only pass through three of them, such as compounding, kneading and granulation.
Although the pretreatment before the molding of the recycled material can be used for the pretreatment before the original resin molding, the pretreatment before molding is different for the preparation of different products for different kinds of recycled materials and the same kind of recycled materials.
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