Injection mould

Plasticinjection mould is used for forming thermoset plastic products or thermoplasticity  plastic products.

Granulous or powdery plastic is fed by the hopper of an injection machine into a heated charging barrel, where it is heated and molten and is then driven and injected by the force plunger or thread institution into a closed mould through the front-end jet of the charging barrel. The molten plastic is then solidified under pressure through cooling ( for thermoset plastic) or heating ( for thermoplasticity plastic ), and it will take the shape the injection mould cavity produces. When the closed mould is opened, a plastic product is obtained. When open the mould and take out plastic products, a moulding period is completed. Such moulding technology is called injection moulding. Here are two injection moulds, single parting line injection mould (Fig 1) and double parting line injection mould (Fig 2).

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    Fig 1 Single parting line injection mould

    1-Ejector pin    2-Ejector retainer plate 3-Ejector guide bush 4-Ejector guide pillar

    5-Ejector plate 6-Sprue puller pin 7-Return pin  8-Support pin

    9-Guide pillar   10-Guide bush  11-Cavity plate of fixed half  12-Feed system

    13-Plastic part  14-Core 

    Fig 2 Double parting line injection mould

    a) Mould closing state      b) Mould opening state

    1-Mould base leg  2-Support plate  3-Punch-retainer plate  4-Stripper plate

    5-Guide pillar  6-Stop pin  7-Spring  8-Limit plate  9-Sprue bush

    10-Clamping plate of the fixed half  11-Middle plate  12-Ejection pin for guide pillar

    13-Ejection pin  14-Ejection retainer plate  15-Ejector plate