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Random copolymer polypropylene pipe special material (Nordic standard） extrusion raw material melt flow rate mismatch（Variant: Mass Production Scenario）

MFR mismatch needs to be solved by selecting suitable grades and adjusting temperature parameters.Targeted preventive measures need to be taken in different production scenarios.

Extrusion & Post melt flow rategrade selectionextrusion gradeprocess adjustmentbatch testing

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

Insufficient long-term hydrostatic strength is caused by material selection and processing quality, requiring comprehensive control from raw material, process and welding.Targeted preventive measures need to be taken in different production scenarios.

Extrusion & Post hydrostatic strengthPPRmolecular weightpipe wall thicknesscrystallinity

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

MFR mismatch needs to be solved by selecting suitable grades and adjusting temperature parameters.Targeted preventive measures need to be taken in different production scenarios.

Extrusion & Post melt flow rategrade selectionextrusion gradeprocess adjustmentbatch testing

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

Melt fracture is flow instability caused by the extrusion speed exceeding the critical value, requiring reduced speed, increased temperature and optimized die design.Targeted preventive measures need to be taken in different production scenarios.

Extrusion & Post melt fracturebamboo markscritical shear ratedie temperatureextrusion speed

Random copolymer polypropylene pipe special material (Nordic standard） extruded products surface sharkskin marks（Variant: Strengthened Measures）

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.Targeted preventive measures need to be taken in different production scenarios.

Extrusion & Post sharkskinmelt fracturedie temperatureextrusion speeddie polishing

Random copolymer polypropylene pipe ovality exceeding standard

Excessive ovality is caused by uneven cooling or external force deformation, and needs to be solved from cooling uniformity and pipe storage.

Extrusion & Post ovalityuniform coolingsizing sleevehaul-off clampingpipe storage

Random copolymer polypropylene extruded pipe bending deformation

Pipe bending is caused by non-uniform cooling or haul-off eccentricity, and needs to be solved from cooling uniformity and equipment alignment.

Extrusion & Post pipe bendinguneven coolinghaul-off alignmentwall thickness uniformitystraightness

Random copolymer polypropylene extruded products die lines/lines

Die lines are caused by die inner wall damage or impurities, requiring regular cleaning and inspection of the die condition.

Extrusion & Post die linesdie scratchesimpurity cleaningrunner designfilter screen

Excessive shrinkage of random copolymer polypropylene extruded products

Excessive shrinkage 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

Longitudinal retraction rate of random copolymer polypropylene pipes exceeding standard

Excessive retraction 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 retraction rateinternal stresscooling ratehaul-off speedmolecular orientation

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