Raw materials used in the processing of Plastic Injection Parts, in addition to polymers, generally add different plastic additives (such as stabilizers, plasticizers, colorants, lubricants and fillers) to improve the molding process and product performance or Save the cost of the product. The additive and the polymer are mixed and uniformly dispersed into a powder, which is also referred to as a dry blend. Sometimes the powder needs to be processed into pellets by mastication. Such powders and pellets are collectively referred to as batch or molding compound.
Plastic molding is a key part of the processing of plastic injection parts. Different forms of plastic (powder, pellets, solution or dispersion) can be made into articles or blanks of the desired shape, and there are as many as thirty molding methods. Its choice depends mainly on the type of plastic (thermoplastic or thermoset), the starting form, and the shape and size of the product. Commonly used methods for processing thermoplastics include extrusion, injection molding, calendering, blow molding, and thermoforming. The thermosetting plastics are generally molded, transferred, and injection molded. The above 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 used in a large amount, and it is also a common molding method.
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