Low Pressure Moulding Tools

Low pressure moulding process makes products with a special surface layer of soft fabric which quite improves decoration and hand feeling. Normally components like map pocket framework, door panel garnish, ABC pillars,etc. are popularly required to make low pressure moulding tools.

(1) The goal of low-pressure injection molding is to bond the skin material with the plastic base material, eliminating the chance of peeling.

(2) The low pressure injection molding technique is more environmentally friendly since there is no glue application procedure required for the overmolding process.

(3) The internal structure of low-pressure double-layer injection molded components may be built freely, and the flexibility of surface modeling is larger than that of the overmolding technique, with clearer and more rigid modeling characteristics.

(4) Low-pressure injection molding eliminates the need for secondary cladding, increasing manufacturing efficiency.

(5) The handfeel and appearance of low-pressure injection molding items are excellent.

(6) Low pressure injection molding goods have a low injection pressure, which effectively protects the product's interior parts and has a low scrap rate.

(1) Part thickness design: surface layer material has a big influence to molten fluidity. Too thin causes short shot so to increase nozzles is necessary but tooling cost is also increased; Too thick increases material cost.

(2) Part edge design: after injection molding, there will be cover layer material remaining which needs post ultrasonic cutting or welding process. If the edge contour profile is too complicated, the production reject rate will go up.

(3) Part fracture surface design: in low pressure moulding tools, surface layer will be set smoothly and be pushed to the mould cavity by the core during mould close which bears stretching. Too deep part section will damage the cover so it should be double thought that the ratio of part surface radian to relative length should be smaller than that of elongation at break.

There should be submerged seal at mold moved side to prevent cover from slipping, the submerged seal and cut seal are determined by material type and thickness.

Cover fixing system

There is no structure movable for fixing of cover

Valve gate , product molded in core side and ejected at gate side.

The cover is plugged into mold cavity from upper of machine

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