China Plastic Molding


Gas-assisted Injection Molding

Gas-assisted injection molding is in use and being developed worldwide. This process is developed for the production of hollow plastic parts with separate internal channels. It is unique because it combines the advantages of conventional injection molding and blow molding while differing from both. Gas-assisted injection moulding offers a cost effective means of producing large, smooth surfaced and rigid parts using lower clamping pressure with little or no finishing. By introducing the gas before complete filling, numerous problems such as warpage, sink marks, and high filling pressure are mostly overcome.

In comparison with conventional injection molding, the gas-assisted process is more critical in terms of process control, especially for multi-cavity applications. The quality of the part is determined by both tool and process variables such as degree of under-fill, gas injection condition, and mold temperature, thus indicating the importance of process control. The process is attracting many molders due to the demand for highly automated production of gas-assisted injection molded parts.

The gas-assisted injection moulding process is most rapidly growing field with considerable work going on in the field of controls and the process development. Research interest is drawn towards the development of new gas injection units, the study of the process variables, the efficiency the production process, and advantages offered by the new process.

The standard gas-assisted injection moulding process can be divided into four partial steps:

• A stage of melt injection
• The gas inlet phase
• The gas holding pressure phase
• A gas return for recycling or a gas release to atmosphere

Advantages of the gas-assisted injection moulding process

• Reducing stress and warpage
• Elimination of sink marks
• Smooth surface
• Reduced clamp tonnage
• Elimination of external runners
• Permitting different wall thickness
• Cycle time reduction
• Resin saving


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