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Gas Assisted Injection Molding And Water Assisted Injection Molding Principle
- Dec 21, 2018 -

Gas-assisted injection molding (GAIM)

Forming principle:

Gas-assisted molding (GAIM) refers to the injection of high-pressure inert gas when the plastic is filled into the cavity (90%~99%). The gas pushes the molten plastic to continue filling the full cavity, and the gas pressure is used instead of the plastic pressure-holding process. An emerging injection molding technology.


Reduce residual stress and reduce warpage;

Eliminate the sag marks;

Reduce the clamping force;

Reduce the length of the flow channel;

Save material;

Shorten production cycle time;

Extend the life of the mold;

Reduce the mechanical loss of the injection molding machine;

It is applied to finished products with large thickness variations.

GAIM can be used to produce tubular and rod-shaped articles, sheet-like articles, and complex articles with varying thickness.

Water-assisted injection molding (WAIM)

Forming principle:

Water-assisted injection molding (WAIM) is an auxiliary injection molding technology developed on the basis of GAIM. Its principle and process are similar to GAIM. WAIM replaces GAIM's N2 with water as a medium for evacuating, penetrating the melt and transmitting pressure.

Features: WAIM has many advantages over GAIM

The thermal conductivity and heat capacity of water are much larger than N2, so the product cooling time is short, and the molding cycle can be shortened;

Water is cheaper than N2 and can be recycled;

The water is incompressible, the finger effect is not easy to occur, and the wall thickness of the product is relatively uniform;

The gas easily penetrates or dissolves into the melt to roughen the inner wall of the product, and bubbles are generated on the inner wall, and the water does not easily penetrate or dissolve into the melt, so that a product having a smooth inner wall can be obtained.