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Large weight fluctuation of homopolymer polypropylene injection products

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

Injection Molding weight fluctuationnon-return ringplasticizing stabilitytemperature controlmetering accuracy

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Roundness out of tolerance of homopolymer polypropylene injection products

Out-of-tolerance roundness is caused by non-uniform shrinkage; it needs to be improved from cooling symmetry, gate design, and wall thickness uniformity.

Injection Molding roundness out of toleranceanisotropic shrinkagecooling uniformitygate positionwall thickness uniformity

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Processing difficulty caused by melt flow rate mismatch of homopolymer polypropylene raw material

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

Injection Molding melt flow rategrade selectionincoming material inspectionprocess adjustmentraw material mixing

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Environmental stress cracking of homopolymer polypropylene injection products

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

Injection Molding environmental stress crackingresidual stressstress concentrationannealing treatmentchemical media

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Stress whitening near the gate of homopolymer polypropylene injection products

Gate stress whitening is caused by excessive shear stress and molecular orientation; it is improved by enlarging the gate, reducing injection speed, and increasing temperature.

Injection Molding stress whiteninggate shearmolecular orientationinjection speedgate size

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Dimensions of homopolymer polypropylene injection products continue to change 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 on the surface of homopolymer polypropylene injection products

Microcracks are a manifestation of excessive residual internal stress; they need to be prevented by optimizing temperature parameters, reducing internal stress, and improving demolding conditions.

Injection Molding crazingmicrocracksinternal stressmolecular orientationdraft angle

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Uneven color/color difference of homopolymer polypropylene injection products

Color difference is caused by uneven colorant dispersion or process parameter fluctuation; consistency needs to be ensured from mixing, plasticizing, and temperature control.

Injection Molding color differencecolor masterbatch dispersiontemperature stabilityback pressurescrew mixing

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Underfill/short shot of homopolymer polypropylene injection products

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

Injection Molding short shotunderfillinjection pressuremelt flowabilitymold venting

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Flow marks on the surface of homopolymer polypropylene injection products

Flow marks are a manifestation of 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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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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