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Large weight fluctuation of general-purpose polyethylene injection molded products

Weight fluctuation is caused by unstable plasticization and metering, and needs to be solved from the screw non-return ring, temperature control, and hydraulic system stability.

Injection Molding weight fluctuation non-return ring stable plasticization temperature control metering accuracy

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Roundness out of tolerance of general-purpose polyethylene injection molded products

Roundness out of tolerance is caused by non-uniform shrinkage, and needs to be improved from three aspects: cooling symmetry, gate design, and wall thickness uniformity.

Injection Molding roundness out of tolerance anisotropic shrinkage uniform cooling gate position uniform wall thickness

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Mismatch of the melt flow rate of general-purpose polyethylene raw material causing processing difficulties

MFR mismatch needs to be solved by selecting suitable grades and adjusting process parameters, and the key is to establish an incoming material MFR inspection system.

Injection Molding melt flow rate grade selection incoming material inspection process adjustment raw material mixing

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Environmental stress cracking appears in general-purpose 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 both aspects of reducing internal stress and avoiding contact with media.

Injection Molding environmental stress cracking residual stress stress concentration annealing treatment chemical medium

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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 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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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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