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Dimensional fluctuation of general-purpose polyethylene extruded products

Dimensional fluctuation is caused by unstable extrusion or haul-off, and each process parameter needs to be systematically stabilized.

Extrusion & Post dimensional fluctuation screw speed haul-off speed temperature stability uniform feeding

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Cyclic pressure fatigue failure of general-purpose polyethylene PPR pipes

Fatigue failure is caused by internal defects and stress concentration, and needs to be improved from three aspects: pipe inner wall quality, welding quality, and material toughness.

Extrusion & Post fatigue failure PPR stress concentration inner wall quality welding bead

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Thermal aging performance of general-purpose polyethylene PPR pipes not up to standard

Thermal aging performance not up to standard is caused by insufficient antioxidant system, and needs to be solved from formulation and processing temperature control.

Extrusion & Post thermal aging antioxidant PPR oxidation induction time extrusion temperature

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Melt flow rate mismatch of raw materials for general-purpose polyethylene extrusion

MFR mismatch needs to be solved by selecting suitable grades and adjusting temperature parameters.

Extrusion & Post melt flow rate grade selection extrusion grade process adjustment batch inspection

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Uneven wall thickness of general-purpose polyethylene extruded pipes

Uneven wall thickness is caused by uneven die gap or uneven temperature, and needs to be solved from mold accuracy and temperature uniformity.

Extrusion & Post uneven wall thickness die concentricity uniform temperature stable haul-off sizing sleeve

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Insufficient long-term hydrostatic strength of general-purpose polyethylene PPR pipes

Insufficient long-term hydrostatic strength is caused by material selection and processing quality, and needs to be comprehensively controlled from raw materials, processes, and welding.

Extrusion & Post hydrostatic strength PPR molecular weight pipe wall thickness crystallinity

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Sharkskin appears on the surface of general-purpose polyethylene extruded products

Sharkskin is the result of stick-slip flow of the melt at the die exit, and is improved by raising the die temperature and reducing the extrusion speed.

Extrusion & Post sharkskin melt fracture die temperature extrusion speed die polishing

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Bamboo pattern/melt fracture appears on the surface of general-purpose polyethylene extruded products

Melt fracture is flow instability caused by the extrusion speed exceeding the critical value, and it is necessary to reduce the speed, raise the temperature, and optimize the die design.

Extrusion & Post melt fracture bamboo pattern critical shear rate die temperature extrusion speed

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Dimensions of general-purpose polyethylene injection molded products too small, below the lower limit

Undersized dimensions are caused by excessive shrinkage, and the shrinkage rate needs to be controlled by strengthening the holding pressure, lowering the temperature, and extending the cooling time.

Extrusion & Post undersized dimension excessive shrinkage insufficient holding pressure post-shrinkage gate freezing

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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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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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