What is called water assisted injection mould?

Water injection is similar of gas-assisted injection molding process of two steps: first step, cavity is completely melt filling;In the second step,inject water form the empty cavity.

Water injection mould generally more expensive than the gas-assisted mold, the reason is that different steel used in the manufacture of moulds.Water used in the injection mould steel higher quality (strong nickel plating layer or titanium nitride coating for the protection of water injection mold from corrosion is essential).

Points for water assisted mould making:
1.The design of the water injection equipment must satisfy the conditions of close to gas-assisted injection molding.
2.Drainage compared with exclusion of nitrogen is more complex, needs to be done by gravity and ventilation with compressed gas "discharge" of plastic parts.
3.In order to prevent corrosion, water must not be in contact with the mould surface.
4.Water injection to high water injection capacity to ensure uniform wall thickness distribution and high surface quality.

Written by Tina
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