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Molding in the production of plastic products The key link in plastic processing. Various forms of plastics (powders, pellets, solutions or dispersions) are made into products or blanks of the desired shape. There are as many as thirty kinds of molding methods. Its choice is mainly determined by the type of plastic (thermoplastic or thermosetting), the initial form, and the shape and size of the product. The commonly used methods for plastic processing of thermoplastics include extrusion, injection molding, calendering, blow molding and thermoforming. Plastic processing of thermoset plastics generally uses compression molding, transfer molding, and injection molding. Laminating, molding, and thermoforming are forming plastics on a flat surface. The above-mentioned plastic processing methods can be used for rubber processing. In addition, there are castings using liquid monomers or polymers as raw materials. Among these methods, extrusion and injection molding are most used, and they are also the most basic molding methods.
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