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Stress whitening appears near the gate of general-purpose polyethylene injection molded products

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.

Injection Molding stress whitening gate shear molecular orientation injection speed gate size

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Dimensions of general-purpose polyethylene injection molded products continue to change after demolding

Post-shrinkage is an inherent characteristic of crystalline materials, and dimensional stability is ensured through sufficient cooling, annealing treatment, and environmental control.

Injection Molding post-shrinkage crystallinity demolding temperature annealing treatment dimensional stability

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General-purpose polyethylene injection molded products surface cracking/microcracks

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.

Injection Molding crackingmicrocracksinternal stressmolecular orientationdraft angle

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General-purpose polyethylene injection molded products uneven color/color difference

Color difference is caused by uneven colorant dispersion or process parameter fluctuations, requiring consistency assurance from three aspects: mixing, plasticization and temperature control.

Injection Molding color differencecolor masterbatch dispersiontemperature stabilityback pressurescrew mixing

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General-purpose polyethylene injection molded products underfill/short shot

Short shot is the result of insufficient melt flowability or excessive filling resistance, and needs to be solved by increasing temperature, pressure and improving the gate and venting system.

Injection Molding short shotunderfillinjection pressuremelt flowabilitymold venting

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General-purpose polyethylene injection molded products flash/burrs

Flash is a manifestation of mismatch between mold clamping force and injection pressure, requiring control from three aspects: clamping force, injection pressure and mold precision.

Extrusion & Post flashclamping forceinjection pressureparting linemold gap

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General-purpose polyethylene injection molded products surface flow marks

Flow marks are a manifestation of an unstable melt flow front, stabilizing the flow front by increasing injection speed, mold temperature and melt temperature.

Injection Molding flow marksinjection speedmold temperaturemelt frontmulti-stage injection

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General-purpose polyethylene injection molded products uneven surface gloss

Uneven gloss reflects inconsistency between the mold surface state and melt flow, and needs improvement from three aspects: mold polishing, temperature uniformity and injection process.

Injection Molding uneven glossmold polishingtemperature uniformityinjection speedcooling system

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General-purpose polyethylene injection molded products weld lines

Weld lines are a manifestation of poor melt convergence and fusion, improving melt fusion quality by increasing melt temperature, injection speed and mold temperature.

Injection Molding weld linemelt convergenceinjection speedmold temperaturegate design

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General-purpose polyethylene injection molded products surface bubbles/voids

Bubbles and voids are mainly caused by moisture vaporization, gas entrainment or insufficient feeding, 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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