Problem & Solution

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

Q

Uneven surface gloss of random copolymer polypropylene injection molded products (variant: strengthened measures)

A

Uneven gloss reflects inconsistencies in mold surface condition and melt flow and needs to be improved from three aspects: mold polishing, temperature uniformity and injection process. In different production scenarios, targeted preventive measures need to be taken.

Injection Molding uneven glossmold polishingtemperature uniformityinjection speedcooling system

Q

Weld lines appearing in random copolymer polypropylene injection molded products (variant: strengthened measures)

A

Weld lines are a manifestation of poor fusion of merging melt streams; melt fusion quality is improved by increasing melt temperature, injection speed and mold temperature. In different production scenarios, targeted preventive measures need to be taken.

Injection Molding weld linemelt merginginjection speedmold temperaturegate design

Q

Bubbles/voids appearing on the surface of random copolymer polypropylene injection molded products (variant: strengthened measures)

A

Bubbles and voids are mainly caused by moisture vaporization, gas entrainment or insufficient shrinkage compensation and need to be systematically solved from raw '2079851475616104451, injection process and holding pressure parameters. In different production scenarios, targeted preventive measur...

Material Drying bubblesvoidsraw '2079851475616104451holding pressuremulti-stage injection

Q

Warpage deformation appearing in random copolymer polypropylene injection molded products (variant: strengthened measures)

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. In different production scenarios, targeted preventive measures ...

Injection Molding warpage deformationcrystallization shrinkagemold temperature uniformityuniform wall thicknesscooling time

Q

Silver streaks/material flowers appearing on the surface of random copolymer polypropylene injection molded products (variant: strengthened measures)

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

Material Drying silver streakmaterial flowerraw '2079851475616104451thermal degradationmold venting

Q

Sink marks appearing at thick-wall areas of random copolymer polypropylene injection molded products (variant: strengthened measures)

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. In different pro...

Injection Molding sink markholding pressurecrystallization shrinkagegate designuniform wall thickness

Q

Pressure resistance test failure of homopolymer polypropylene pipes

A

Pressure test failure is caused by insufficient wall thickness, material degradation, or internal defects; it needs to be systematically solved from process and material quality.

Processing Machinery pressure resistance testpipe wall thicknessmaterial degradationcrystallinityplasticizing quality

Q

Film blocking/poor anti-blocking of homopolymer polypropylene film

A

Film blocking is caused by surface tension and temperature; it needs to be solved by adding anti-blocking agents and controlling winding conditions.

Extrusion & Post film blockinganti-blocking agentwinding temperaturewinding tensionslip agent

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