Einar® mould release solutions for polypropylene (PP) • Einar® 201 is a food-approved general purpose mould release for most PP injection moulding applications • Einar® 201 offers excellent performance across all PP polymer grades Application background An efficient mould release agent will guarantee smooth release of parts in an injection moulding process and secure consistent operation and a reduction of cycle times. A mould release agent will lubricate the interface between polymer and mould during each injection moulding cycle and it is therefore of vital importance that the additive can be dosed at an optimum concentration where there is enough of a lubricant effect for efficient release but not too much to leave deposits or residue that may result in defective parts or clocking of the moulds venting system. . Polypropylene is a semi-crystalline polymer and will exhibit some shrinkage when the resin solidifies and the effect of shrinkage will often require mould release additives for lubrication and efficient release of moulded parts. Shrinkage may also cause nesting problems of stacked parts and a secondary effect of an efficient mould release additive is to have good de-nesting properties that allows stacked parts to be easily separated.
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