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  • What are the processes used to make plastic?

    Release time: 2023-12-01


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    The plastic machinery industry chain can be divided into three parts: upstream raw materials and parts, midstream plastic machinery manufacturing, and downstream market, of which 1) upstream raw materials and parts mainly include molds, hydraulic transmission systems, heating and cooling systems, digital control systems, etc. 2) The middle reaches are mainly for the production of injection molding machines, extruders, blow molding machines and other equipment; 3) The downstream is the application market including the automotive industry, household appliance industry, medical industry, packaging industry and construction industry.

    Plastic molding process is diverse, with the development of technology, plastic products are more and more complex, the molding process to seek higher and higher. The choice of molding process depends mainly on the type of plastic (thermoplastic/thermosetting), the starting state and the shape and size of the product. The commonly used methods for processing thermoplastics are injection molding, extrusion, blow molding, etc., and there are more than 30 kinds of molding methods. Among them, injection molding is one of the most common molding methods in plastic products at present, which can be generally divided into molding and die casting. Injection molding machines take thermoplastic/thermosetting plastics and mold them into various shapes. Extrusion molding refers to the action of plastic through the extruder cylinder and screw, the side is thermoplasticized, the side is pushed forward by the screw, and the various cross-section products or semi-products are continuously made through the machine head. Blow molding, also known as hollow blow molding, is a rapidly developing plastic processing method. A tubular plastic-shaped blank obtained by extrusion or injection molding of thermoplastic resin and placed hot (or heated to a softened state) in a split mold. After the mold is closed, compressed air is passed into the billet immediately, so that the plastic billet is blown and close to the inner wall of the mold. After cooling and demoulding, various hollow products are obtained.

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