Injection Mould Parts

The parts of injection mould are divided into the following categories based on their different functions.

Forming part: The forming parts consist of the punch (also know as the core ), the cavity plate ( also known as the cavity ), inlay and insert. When the whole mould is closed, a cavity is established. In the mould, the cavity is produced by fixed half of a mould and punch.

Feed system: The feed system refers to the passage-way through which the molten plastic passes from the nozzle of the injection machine into mold cavity. It consists of four parts: sprue, runner, gate and cold-slug well.

Ejecting mechanism: The ejecting mechanism means the equipment push-off plastic part from mould after parting. In the mould, the ejecting mechanism consists together of ejector plate and ejector retainer plate, and sprue puller pin, and ejector guide pillar, and ejector guide bush, and ejector pin, and return pin.

Temperature adjustable system: In order to meet the demand on temperature of the mould in the injection technology, the temperature of the mould must be controlled, so a temperature adjustment system is normally installed for cooling or heating the mould. The cooling system is generally realized through the cooling channel on the mold. The heating system consists of the heating elements inside or around the mould.

Exhaust and overflowing system: In order to exhaust gases inside the cavity in the process of injection and forming, an exhaust and overflowing system mush be set up. Gases can be exhausted by the parting line, by air vent purposefully made on the parting line, or through the fit clearance between the ejector pin or core and the mould plate.

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