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Random copolymer polypropylene pipe special material (Nordic standard） extruded products excessive shrinkage rate

Excessive shrinkage rate is caused by high crystallinity or high temperature, and needs to be solved by controlling temperature and cooling rate.

Extrusion & Post shrinkage ratecrystallinitymelt temperaturecooling ratehaul-off speed

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Random copolymer polypropylene pipe special material (Nordic standard） pipe longitudinal reversion rate exceeding standard

Excessive reversion rate is caused by large internal stress or excessive orientation, and needs to be solved from temperature control, cooling rate and haul-off speed.

Extrusion & Post longitudinal reversion rateinternal stresscooling ratehaul-off speedmolecular orientation

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Random copolymer polypropylene pipe special material (Nordic standard） PPR pipe cyclic pressure fatigue failure

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

Extrusion & Post fatigue failurePPRstress concentrationinner wall qualityweld bead

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Random copolymer polypropylene pipe special material (Nordic standard） PPR pipe thermal aging performance substandard

Substandard thermal aging performance is caused by an insufficient antioxidant system, and needs to be solved from formulation and processing temperature control.

Extrusion & Post thermal agingantioxidantPPRoxidation induction timeextrusion temperature

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Random copolymer polypropylene pipe special material (Nordic standard） extruded pipe uneven wall thickness

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

Extrusion & Post uneven wall thicknessdie concentricitytemperature uniformityhaul-off stabilitysizing sleeve

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Random copolymer polypropylene pipe special material (Nordic standard） PPR pipe insufficient long-term hydrostatic strength

Insufficient long-term hydrostatic strength is caused by material selection and processing quality, requiring comprehensive control from raw material, process and welding.

Extrusion & Post hydrostatic strengthPPRmolecular weightpipe wall thicknesscrystallinity

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Random copolymer polypropylene pipe special material (Nordic standard） extrusion raw material melt flow rate mismatch

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

Extrusion & Post melt flow rategrade selectionextrusion gradeprocess adjustmentbatch testing

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Random copolymer polypropylene pipe special material (Nordic standard） extruded products surface bamboo marks/melt fracture

Melt fracture is flow instability caused by the extrusion speed exceeding the critical value, requiring reduced speed, increased temperature and optimized die design.

Extrusion & Post melt fracturebamboo markscritical shear ratedie temperatureextrusion speed

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Random copolymer polypropylene pipe special material (Nordic standard） extruded products surface sharkskin marks

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

Extrusion & Post sharkskinmelt fracturedie temperatureextrusion speeddie polishing

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Random copolymer polypropylene pipe special material (Nordic standard） extruded pipe bending deformation（Variant: Mass Production Scenario）

Pipe bending is caused by non-uniform cooling or haul-off eccentricity, and needs to be solved from cooling uniformity and equipment alignment.Targeted preventive measures need to be taken in different production scenarios.

Extrusion & Post pipe bendinguneven coolinghaul-off alignmentwall thickness uniformitystraightness

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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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