Injection moulding is a manufacturing process for producing parts by injecting material into a mould. Injection moulding can beperformed with a host of materials, including metals, (for which the process is called diecasting), glasses, elastomers, confections, and most comonly thermoplastic and thermosetting polymers.
The process uses large injection molding machines, which advance the resins through six major processes to produce everything from computer parts to plastic Halloween spiders. Although this machine is a complex piece of equipment, it consists of two basic elements: the injection unit and the clamping unit. The process starts with a mold, which is clamped under pressure to accommodate the injection and cooling process. Then, pelletized resins are fed into the machine, followed by the appropriate colorants. The resins then fall into an injection barrel, where they are heated to a melting point, and then injected into the mold through either a screw or ramming device.
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