Technical benefits

The use of the gas-Assisted injection moulding improves the quality of the product as it reduces the imperfections which seldom make the parts in semi-expanded plastic material difficult to finish or paint and enables a wider range of design solutions.

Furthermore by the use of the gas-Assisted Technology one can reduce the production costs, as it allows a reduction in the weight of the material, in the production cycles, in the assembly and energy costs. Mould investment costs are also reduced as such technology leads to a decrease in the press clamping force, a decrease in the mould wear and a cut of the mould construction costs, thanks to the use of aluminium.

Stage 1

Stage 2/3/4

Stage 5

Stage 1 - The plastic material is injected as a controlled short shot volume in the mould.

Stage 2 - The gas penetrates the material and further advances the mould melt front, displacing the molten plastic. The gas follows paths of least resistance, and therefore flows into thicker sections where the plastic is still molten.

Stage 3 - The gas penetration forms continuous hollow channels within the plastic and completes filling the mould cavity with plastic and gas (primary gas penetration).

Stage 4 - The gas inside goes on expanding radially and in length, applying pressure to the plastic whilst it cools and solidifies. The plastic part reduces its volume while it solidifies.



Stage 5 - The gas is exhausted before the mould opens and the moulded article is ejected.

The gas-assisted injection moulding can virtually operate on any injection moulding machine by the connection of the Gas Injection Phased Pressure Control equipment.

The gas may be injected into the plastic either directly into the mould cavity or into the moulding machine nozzle.

CASE HISTORY