Plastic processing technology
Compression molding is also called compression molding or compression molding. Compression molding is mainly used for the molding of thermosetting plastics such as phenolic resin, urea-formaldehyde resin, and unsaturated polyester resin.
Calendering is to process the resin and various additives through the gap between two or more calender rolls of the calender, which turn in opposite directions, after the expected treatment (kneading, filtration, etc.) into a film or sheet, and then peel it off from the calender roll. , A molding method that is cooled and shaped. Calendering is a molding method mainly used for polyvinyl chloride resin, which can produce films, sheets, plates, artificial leather, floor tiles and other products.
The process of adding appropriate foaming agents to foaming materials (PVC, PE, PS, etc.) to make plastics have a microporous structure. Almost all thermosetting and thermoplastic plastics can be made into foam. According to the cell structure, it is divided into open-cell foam (most of the pores are connected to each other) and closed-cell foam (most of the pores are separated from each other). This is mainly due to the manufacturing method (divided into chemical foaming, physical foaming) And mechanical foaming).