The key part of PVC plastic processing is molding. Various forms of PVC plastics, such as powder and granules, are made into various products of desired shape. There are more than thirty kinds of molding methods. The selection is mainly determined by the type of PVC plastic, thermoplastic or thermosetting, the initial shape and the shape and size of the products. The commonly used methods of processing thermoplastic PVC plastics are extrusion, injection molding, calendering, blow molding, etc.. The processing of thermosetting PVC plastics is usually mould pressing, transfer moulding and injection moulding.
In addition to polymers, PVC plastics processing raw materials are generally added to various PVC plastic additives such as stabilizer, plasticizer, colorant, lubricant, enhancer and filler to improve the performance of molding processes and products or to reduce the cost of products.
The assembly adopts bonding, welding and mechanical connection methods to make the PVC plastic parts assembled into complete products. For example, PVC profiles are assembled into PVC window frames and PVC doors after sawing, welding, drilling, and other steps.
The purpose of surface modification is to beautify the surface of PVC plastic products, usually including mechanical modification, that is, to use file, grinding, polishing and other processes to remove the edges and burrs on the parts, and to correct the size. Color, including coloring, printing and hot stamping; metal plating, including vacuum coating, electroplating and chemical silver plating. The hot stamping is to transfer the colored aluminum foil layer (or other pattern film) on the hot stamping film to the workpiece under heating and pressing. Many household appliances and building products, daily necessities, etc. are used to obtain metallic luster or wood patterns.