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How to Reduce the Linear Shrinkage in Polypropylene Moulding
To reduce linear shrinkage in polypropylene molding, raise holding pressure and hold until the gate freezes, run a colder mold and give the part more cooling time; when the press settings run out, move to a glass- or talc-filled compound or a copolymer grade. Unfilled polypropylene shrinks about 1–2 % in the mold, depending on…
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