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Q

Dimensions of Block Copolymer Polypropylene Injection Molded Products Too Large Exceeding the Upper Limit (Variant: Strengthened Measures)

A

Oversized dimensions are mainly caused by insufficient shrinkage, and the actual shrinkage rate is controlled within the tolerance range by adjusting the holding pressure and temperature parameters. Targeted preventive measures need to be taken in different production scenarios.

Extrusion & Post oversized dimensionsholding pressureshrinkage ratemold temperaturedimension control

Q

Silver Streaks/Material Flowers Appearing on the Surface of Block Copolymer Polypropylene Injection Molded Products

A

Silver streaks are mainly caused by raw material moisture, thermal degradation, or poor venting, and need to be systematically investigated from three aspects: raw '2079851475616104451, temperature control, and mold venting.

Material Drying silver streakmaterial flowerraw '2079851475616104451thermal degradationmold venting

Q

Out-of-Tolerance Flatness of Block Copolymer Polypropylene Injection Molded Products (Variant: Strengthened Measures)

A

Out-of-tolerance flatness is a manifestation of uneven shrinkage of large-area products, and the shrinkage uniformity in all directions needs to be controlled by optimizing cooling, gating, and product design. Targeted preventive measures need to be taken in different production scenarios.

Injection Molding out-of-tolerance flatnessuneven shrinkageuniform coolingmulti-point gatesymmetric reinforcing ribs

Q

Out-of-Tolerance Roundness of Block Copolymer Polypropylene Injection Molded Products (Variant: Strengthened Measures)

A

Out-of-tolerance roundness is caused by non-uniform shrinkage, and needs to be improved from three aspects: cooling symmetry, gate design, and wall thickness uniformity. Targeted preventive measures need to be taken in different production scenarios.

Injection Molding out-of-tolerance roundnessanisotropic shrinkageuniform coolinggate positionuniform wall thickness

Q

Stress Whitening Near the Gate of Block 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 the injection speed, and increasing the temperature. Targeted preventive measures need to be taken in different production scenarios.

Injection Molding stress whiteninggate shearmolecular orientationinjection speedgate size

Q

Cracking/Microcracks Appearing on the Surface of Block Copolymer Polypropylene Injection Molded Products (Variant: Strengthened Measures)

A

Microcracks are a manifestation of excessive residual internal stress, and need to be prevented by optimizing temperature parameters, reducing internal stress, and improving demolding conditions. Targeted preventive measures need to be taken in different production scenarios.

Injection Molding crackingmicrocracksinternal stressmolecular orientationdemolding draft

Q

Uneven Color/Color Difference Appearing on Block Copolymer Polypropylene Injection Molded Products (Variant: Strengthened Measures)

A

Color difference is caused by uneven dispersion of the colorant or fluctuations in process parameters, and consistency needs to be ensured from three aspects: mixing, plasticization, and temperature control. Targeted preventive measures need to be taken in different production scenarios.

Injection Molding color differencecolor masterbatch dispersiontemperature stabilityback pressurescrew mixing

Q

Underfilling/Short Shot of Block Copolymer Polypropylene Injection Molded Products (Variant: Strengthened Measures)

A

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

Injection Molding short shotunderfillinginjection pressuremelt flowabilitymold venting

Q

Flash/Burrs Appearing on Block Copolymer Polypropylene Injection Molded Products (Variant: Strengthened Measures)

A

Flash is a manifestation of the mismatch between the mold clamping force and the injection pressure, and needs to be controlled from three aspects: clamping force, injection pressure, and mold precision. Targeted preventive measures need to be taken in different production scenarios.

Extrusion & Post flashclamping forceinjection pressureparting linemold gap

Q

Sink Marks at Thick-Walled Parts of Block Copolymer Polypropylene Injection Molded Products

A

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

Injection Molding sink markholding pressurecrystallization shrinkagegate designuniform wall thickness

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