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Nozzle blockage in general-purpose polyethylene '2079851475616104452

Nozzle blockage is caused by cold material solidification or impurities, and needs to be solved from nozzle temperature, cold slug well design, and raw material cleanliness.

Injection Molding nozzle blockage nozzle temperature cold material impurities alignment

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

Flatness out of tolerance is a manifestation of uneven shrinkage of large-area products, and it is necessary to control the uniformity of shrinkage in all directions by optimizing cooling, gates, and product design.

Injection Molding flatness out of tolerance uneven shrinkage uniform cooling multi-point gate symmetrical reinforcing ribs

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Dimensions of general-purpose polyethylene injection molded products too large, exceeding the upper limit

Oversized dimensions are mainly caused by insufficient shrinkage, and the actual shrinkage rate is controlled within the tolerance range by adjusting the holding pressure and temperature parameters.

Extrusion & Post oversized dimension holding pressure shrinkage rate mold temperature dimensional control

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Unbalanced ejection of general-purpose polyethylene injection mold causing product deformation

Unbalanced ejection is caused by the design of the ejector pin system or large demolding resistance, and the ejector pin layout and demolding conditions need to be optimized.

Injection Molding ejection deformation ejector pin balance draft angle ejection speed mold temperature

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Excessive moisture content of general-purpose polyethylene raw material causing product defects

Excessive moisture content of the raw material is solved by sufficient drying, and a sound drying and storage management system needs to be established.

Material Drying moisture content drying silver streak bubble moisture-proof storage

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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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Insufficient impact strength of general-purpose polyethylene injection molded products

Insufficient impact strength is usually caused by excessive internal stress or material degradation, and needs to be addressed from temperature parameters, drying, and regrind control.

Material Drying impact strength internal stress molecular orientation material degradation regrind control

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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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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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