Plastics processing steps

History plastic processing, with the development of synthetic resin and developed, it is the development of plastic machinery and promote each other. Many plastics processing technology, the Department of borrowed rubber, metal and ceramic processing. Plastic processing history can be traced back to the 1890s, celluloid after the birth, because of its flammability, only with lumps molded into the legal system, and then machined into a film, sheet thermoforming process available. This is the earliest plastics processing. Casting, with the advent of the phenolic resin successful research; injection molding began in the 1920s, for the processing of cellulose acetate and polystyrene; mid-1930s, the successful development of flexible PVC extrusion molding, for plastics the advent of a single screw extruder accordingly; 1938 twin-screw extruder is also put into production. The early 1940s, the system out of polyurethane foam, polyethylene blow molding techniques for the production of hollow products. 1952 advent reciprocating screw injection machine, the injection molding technology into a new stage. 60 to 70 years, newly developed plastics processing technologies: a new variety of reinforced plastic molding methods, such as winding, pultrusion, sheet molding, reaction injection molding, structural foam molding, profile extrusion molding, sheet solid phase as well as co-extrusion molding, co-injection and so on. In the 1980s, plastic processing toward efficient, high-speed, high-precision, energy saving, large-scale or ultra-small, ultra-thin and other direction, entered the field of computer technology, the entire plastics processing technology to a new level.impact modifier
Ingredients of the raw materials used in plastics processing, in addition to the polymer, in general, also adding various plastic additives (such as stabilizers, plasticizers, colorants, lubricants, reinforcing agents and fillers, etc.) to improve the molding process and products of performance or reduce the cost of products. Additives are mixed with the polymer, dispersed as powder, also known as dry mixture. Sometimes need the mastication powder processed into pellets. This powder and pellets collectively with the material or molded plastic.
Molded plastic processing key. The various forms of plastic (powder, granules, a solution or dispersion) into a desired shape of the article or the blanks. Up to thirty different molding methods. It is mainly determined by the choice of the type of plastic (thermoplastic or thermosetting), the initial shape, and the shape and size of products. Common thermoplastic processing methods are extrusion, injection molding, calendering, blow molding and thermoforming, thermosetting plastics are generally used processing molding, transfer molding, and injection molding. Laminating, molding and thermoforming are in the plane of the plastic molding. The plastics processing methods can be used for rubber processing. In addition, a liquid monomer or a polymer such as a casting material. In these methods, extrusion and injection molding to the most, is the most basic molding method.Metal stearate