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Q

Burnt marks/burn spots appearing in random copolymer polypropylene injection molded products (variant: strengthened measures)

A

Burnt marks are the result of trapped air in the cavity being compressed and heated, causing material carbonization; the core solutions are improving venting and reducing injection speed. In different production scenarios, targeted preventive measures need to be taken.

Injection Molding burnt markburn spotmold ventinginjection speedtrapped air compression

Q

Warpage deformation appearing in random copolymer polypropylene injection molded products

A

Warpage deformation is a core challenge of crystalline material '2079851475616104452; its essence is internal stress caused by non-uniform shrinkage, requiring systematic control from multiple dimensions of design, process and mold.

Injection Molding warpage deformationcrystallization shrinkagemold temperature uniformityuniform wall thicknesscooling time

Q

Flatness out of tolerance of random copolymer polypropylene injection molded products (variant: strengthened measures)

A

Flatness out of tolerance is a manifestation of uneven shrinkage in large-area products and needs to be controlled by optimizing cooling, gates and product design for uniform shrinkage in all directions. In different production scenarios, targeted preventive measures need to be taken.

Injection Molding flatness out of toleranceuneven shrinkageuniform coolingmulti-point gatesymmetric reinforcing ribs

Q

Roundness out of tolerance of random copolymer polypropylene injection molded products (variant: strengthened measures)

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. In different production scenarios, targeted preventive measures need to be taken.

Injection Molding roundness out of toleranceanisotropic shrinkageuniform coolinggate positionuniform wall thickness

Q

Stress whitening appearing near the gate of random copolymer polypropylene injection molded products (variant: strengthened measures)

A

Gate stress whitening is caused by excessive shear stress and molecular orientation and is improved by enlarging the gate, reducing injection speed and increasing temperature. In different production scenarios, targeted preventive measures need to be taken.

Injection Molding stress whiteninggate shearmolecular orientationinjection speedgate size

Q

Cracking/micro-cracks appearing on the surface of random copolymer polypropylene injection molded products (variant: strengthened measures)

A

Micro-cracks are a manifestation of excessive residual internal stress and need to be prevented by optimizing temperature parameters, reducing internal stress and improving demolding conditions. In different production scenarios, targeted preventive measures need to be taken.

Injection Molding crackingmicro-cracksinternal stressmolecular orientationdraft angle

Q

Uneven color/color difference appearing in random copolymer polypropylene injection molded products (variant: strengthened measures)

A

Color difference is caused by uneven colorant dispersion or process parameter fluctuations and needs to be ensured from three aspects: mixing, plasticizing and temperature control. In different production scenarios, targeted preventive measures need to be taken.

Injection Molding color differencecolor masterbatch dispersiontemperature stabilityback pressurescrew mixing

Q

Underfill/short shot appearing in random copolymer polypropylene injection molded products (variant: strengthened measures)

A

Short shot is the result of insufficient melt fluidity or excessive filling resistance and needs to be solved by increasing temperature and pressure and improving the gating and venting system. In different production scenarios, targeted preventive measures need to be taken.

Injection Molding short shotunderfillinjection pressuremelt fluiditymold venting

Q

Sink marks appearing at thick-wall areas of random copolymer polypropylene injection molded products

A

Sink marks are a typical defect of crystalline material '2079851475616104452; the root cause is that local volume shrinkage is not effectively compensated, and they need to be solved coordinately from three aspects: holding pressure parameters, gate design and cooling conditions.

Injection Molding sink markholding pressurecrystallization shrinkagegate designuniform wall thickness

Q

Flow marks appearing on the surface of random copolymer polypropylene injection molded products (variant: strengthened measures)

A

Flow marks are a manifestation of an unstable melt flow front; the flow front is stabilized by increasing injection speed, mold temperature and melt temperature. In different production scenarios, targeted preventive measures need to be taken.

Injection Molding flow markinjection speedmold temperaturemelt frontmulti-stage injection

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