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Environmental Stress Cracking of High-Density Polyethylene Injection-Molded Products

Environmental stress cracking is the result of the synergistic action of internal stress and chemical media, and needs to be prevented from two aspects: reducing internal stress and avoiding contact with media.

Injection Molding environmental stress crackingresidual stressstress concentrationannealing treatmentchemical medium

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Stress Whitening Near the Gate of High-Density 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 whiteninggate shearmolecular orientationinjection speedgate size

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Continued Dimensional Change of High-Density Polyethylene Injection-Molded Products After Demolding

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

Injection Molding post-shrinkagecrystallinitydemolding temperatureannealing treatmentdimensional stability

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Crazing/Microcracks Appearing on the Surface of High-Density Polyethylene Injection-Molded Products

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 crazingmicrocrackinternal stressmolecular orientationdraft angle

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Color Unevenness/Color Difference of High-Density Polyethylene Injection-Molded Products

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

Injection Molding color differencecolor masterbatch dispersiontemperature stabilityback pressurescrew mixing

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Underfilling/Short Shot of High-Density Polyethylene Injection-Molded Products

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

Injection Molding short shotunderfillinginjection pressuremelt fluiditymold venting

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Flash/Burrs on High-Density Polyethylene Injection-Molded Products

Flash is a manifestation of a 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.

Extrusion & Post flashclamping forceinjection pressureparting linemold gap

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Flow Marks Appearing on the Surface of High-Density Polyethylene Injection-Molded Products

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

Injection Molding flow markinjection speedmold temperaturemelt frontmulti-stage injection

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Uneven Surface Gloss of High-Density Polyethylene Injection-Molded Products

Uneven gloss reflects the inconsistency of the 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 on High-Density Polyethylene Injection-Molded Products

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

Injection Molding weld linemelt convergenceinjection speedmold temperaturegate design

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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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