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Random copolymer polypropylene pipe special material (Nordic standard） Random copolymer polypropylene pipe special material (Nordic standard） defects caused by insufficient drying before processing（Variant: Strengthened Measures）

Insufficient drying is a common root cause of processing defects, requiring the establishment of a sound drying system and moisture content testing system.Targeted preventive measures need to be taken in different production scenarios.

Material Drying raw '2079851475616104451moisture contentsilver streaksbubblesdehumidifying drying

Random copolymer polypropylene pipe special material (Nordic standard） PPR pipe welded joint leakage（Variant: Strengthened Measures）

PPR welded joint leakage is caused by improper welding parameters or welding surface contamination, requiring strict control of welding temperature, time and cleanliness.Targeted preventive measures need to be taken in different production scenarios.

Processing Machinery PPR weldinghot-melt weldingwelding temperaturewelding timefitting matching

Random copolymer polypropylene pipe special material (Nordic standard） Random copolymer polypropylene pipe special material (Nordic standard） improper processing temperature window selection（Variant: Strengthened Measures）

Temperature window selection is the foundation of processing, and needs to be set reasonably according to material characteristics and actual operating experience.Targeted preventive measures need to be taken in different production scenarios.

Processing Machinery processing temperaturetemperature windowplasticization qualitymaterial degradationtemperature calibration

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 cut end face uneven

Uneven cut end faces are caused by tool wear or improper cutting parameters, requiring tool maintenance and cutting process optimization.

Processing Machinery cut end facecutting toolcutting speedpipe coolingcutting machine calibration

Random copolymer polypropylene extruder cooling system efficiency decline

The decline in cooling efficiency is caused by insufficient water volume or excessive water temperature, requiring improvement of the cooling system and control of water temperature.

Production & Quality cooling efficiencycooling water flowcooling water temperaturewater channel scalingcooling water tank

Random copolymer polypropylene extruder sizing device failure

Sizing device failure needs to be solved from three aspects: vacuum system, cooling system and mold precision.

Molding Process sizing devicevacuum degreesizing sleeve wearcooling watermold concentricity

Random copolymer polypropylene extruder die head runner design unreasonable

The die head runner design needs to ensure uniform melt distribution and no stagnant material; if necessary, redesign the die head.

Molds & Tooling die head runneruniform flow velocityland sectionrunner dead cornertemperature uniformity

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

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