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Cracking/micro-cracks appearing on the surface of random copolymer polypropylene injection molded products

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.

Injection Molding crackingmicro-cracksinternal stressmolecular orientationdraft angle

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Uneven color/color difference appearing in random copolymer polypropylene injection molded products

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.

Injection Molding color differencecolor masterbatch dispersiontemperature stabilityback pressurescrew mixing

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Underfill/short shot appearing in random copolymer polypropylene injection molded products

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.

Injection Molding short shotunderfillinjection pressuremelt fluiditymold venting

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Flash/burrs appearing in random copolymer polypropylene injection molded products

Flash is a manifestation of mismatch between mold clamping force and injection pressure and needs to be controlled from three aspects: clamping force, injection pressure and mold precision.

Extrusion & Post flashclamping forceinjection pressureparting linemold gap

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Flow marks appearing on the surface of random copolymer polypropylene injection molded products

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.

Injection Molding flow markinjection speedmold temperaturemelt frontmulti-stage injection

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Uneven surface gloss of random copolymer polypropylene injection molded products

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.

Injection Molding uneven glossmold polishingtemperature uniformityinjection speedcooling system

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Weld lines appearing in random copolymer polypropylene injection molded products

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.

Injection Molding weld linemelt merginginjection speedmold temperaturegate design

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Dimensions of random copolymer polypropylene injection molded products too small, below the lower limit (variant: strengthened measures)

Undersized dimensions are caused by excessive shrinkage and need to be controlled by strengthening holding pressure, lowering temperature and extending cooling time. In different production scenarios, targeted preventive measures need to be taken.

Extrusion & Post undersized dimensionsexcessive shrinkageinsufficient holding pressurepost-shrinkagegate freezing

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

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

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Bubbles/voids appearing on the surface of random copolymer polypropylene injection molded products

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.

Material Drying bubblesvoidsraw '2079851475616104451holding pressuremulti-stage injection

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Tüm Konular 11636 Material Drying 1439 Injection Molding 1506 Molding Process 740 Molds & Tooling 1506 Processing Machinery 2025 Extrusion & Post 2239 Blow Molding 315 Thermoforming 141 Material Analysis 1343 Production & Quality 382

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