An injection moulding process for making parts using a polypropylene composition comprising calcium carbonate

摘要

An injection moulding process for making parts, comprising the steps of: providing molten polypropylene composition comprising particulate CaCO 3 and additive; injecting said polypropylene composition into a mould to form said part; cooling said polypropylene composition to solidify it; ejecting said part from the mould; preparing the mould for moulding the next part; wherein the time of the cooling step is shortened by at least 1.5% compared to said process using a reference polypropylene composition substantially free of CaCO 3 .