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Problem & Solution

Practical answers to common plastic material challenges

11636 questions
Q
Flatness out of tolerance of random copolymer polypropylene injection molded products
Q
Product deformation caused by unbalanced ejection of random copolymer polypropylene injection mold
Q
Large weight fluctuation of random copolymer polypropylene injection molded products
Q
Product defects caused by excessive moisture content in random copolymer polypropylene raw material
Q
Insufficient impact strength of random copolymer polypropylene injection molded products
Q
Roundness out of tolerance of random copolymer polypropylene injection molded products
A
Roundness out of tolerance is caused by non-uniform shrinkage and needs to be improved from three aspects: cooling symmetry, gate design and wall thickness uniformity.
Injection Molding roundness out of toleranceanisotropic shrinkageuniform coolinggate positionuniform wall thickness
Q
Processing difficulties caused by melt flow rate mismatch of random copolymer polypropylene raw material
A
MFR mismatch needs to be solved by selecting suitable grades and adjusting process parameters; the key is to establish an incoming material MFR testing system.
Injection Molding melt flow rategrade selectionincoming material testingprocess adjustmentraw material mixing
Q
Environmental stress cracking appearing in random copolymer polypropylene injection molded products
Q
Stress whitening appearing near the gate of random copolymer polypropylene injection molded products
Q
Dimensions of random copolymer polypropylene injection molded products continue to change after demolding
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