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  • the molds of injection     [2014-01-03]

    Mold Mold or die are the common terms used to describe the tool used to produce plastic parts in molding. Since molds have been expensive to manufacture, they were usually only used in mass production where thousands of parts were being produced. Typical molds are constructed from hardened steel, pre-hardened steel, aluminum, and/or beryllium-copper alloy.[12]:176 The choice of material to build a mold from is primarily one of economics; in general, steel molds cost more to construct, but their longer lifespan will offset the higher initial cost over a higher number of parts mad...

  • the equipment of the mold     [2014-01-03]

    Equipment Paper clip mold opened in molding machine; the nozzle is visible at right Main article: Injection molding machine Injection molding machines consist of a material hopper, an injection ram or screw-type plunger, and a heating unit.[1]:240 They are also known as presses, they hold the molds in which the components are shaped. Presses are rated by tonnage, which expresses the amount of clamping force that the machine can exert. This force keeps the mold closed during the injection process. Tonnage can vary from less than 5 tons to over 9...

  • the design of the injection mold     [2014-01-03]

        Injection molding utilizes a ram or screw-type plunger to force molten plastic material into a mold cavity; this solidifies into a shape that has conformed to the contour of the mold. It is most commonly used to process both thermoplastic and thermosetting polymers, with the former being considerably more prolific in terms of annual material volumes processed.[2]:1–3 Thermoplastics are prevalent due to characteristics which make them highly suitable for injection molding, such as the ease with which they may be recycled, their versatility allowing them to be used in ...

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