Problem & Solution

Q

Random copolymer polypropylene pipe special material (Nordic standard） pipe longitudinal reversion rate exceeding standard（Variant: Mass Production Scenario）

A

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

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

Q

Random copolymer polypropylene pipe special material (Nordic standard） extruded products inner wall roughness（Variant: Mass Production Scenario）

A

Inner wall roughness is caused by low mandrel temperature or poor surface condition, and needs to be solved from temperature control and mold maintenance.Targeted preventive measures need to be taken in different production scenarios.

Processing Machinery inner wall roughnessmandrel temperaturemandrel polishingmelt temperatureplasticization quality

Q

Random copolymer polypropylene pipe special material (Nordic standard） extruded products excessive shrinkage rate（Variant: Strengthened Measures）

A

Excessive shrinkage rate is caused by high crystallinity or high temperature, and needs to be solved by controlling temperature and cooling rate.Targeted preventive measures need to be taken in different production scenarios.

Extrusion & Post shrinkage ratecrystallinitymelt temperaturecooling ratehaul-off speed

Q

Random copolymer polypropylene pipe special material (Nordic standard） extruded products degradation discoloration（Variant: Mass Production Scenario）

A

Degradation discoloration is caused by overheating or excessive shear, and needs to be prevented from three aspects: temperature control, rotational speed and material selection.Targeted preventive measures need to be taken in different production scenarios.

Processing Machinery degradation discolorationthermal degradationscrew speedresidence timeantioxidant

Q

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

A

A lusterless surface is caused by low die temperature or too fast cooling, requiring increased die temperature and slowed cooling.Targeted preventive measures need to be taken in different production scenarios.

Processing Machinery lusterlessdie temperaturecooling ratedie polishingmelt temperature

Q

Random copolymer polypropylene pipe special material (Nordic standard） Random copolymer polypropylene pipe special material (Nordic standard） improper production environment control during processing（Variant: Strengthened Measures）

A

The production environment is an important factor affecting processing quality, requiring the establishment of a sound environmental control system.Targeted preventive measures need to be taken in different production scenarios.

Material Drying environmental controlworkshop temperaturehumiditycooling water temperatureprocess stability

Q

Random copolymer polypropylene pipe special material (Nordic standard） pipe longitudinal reversion rate exceeding standard（Variant: Strengthened Measures）

A

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

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

Q

Random copolymer polypropylene pipe special material (Nordic standard） extruded products inner wall roughness（Variant: Strengthened Measures）

A

Inner wall roughness is caused by low mandrel temperature or poor surface condition, and needs to be solved from temperature control and mold maintenance.Targeted preventive measures need to be taken in different production scenarios.

Processing Machinery inner wall roughnessmandrel temperaturemandrel polishingmelt temperatureplasticization quality

Q

Random copolymer polypropylene pipe special material (Nordic standard） extruded products degradation discoloration（Variant: Strengthened Measures）

A

Degradation discoloration is caused by overheating or excessive shear, and needs to be prevented from three aspects: temperature control, rotational speed and material selection.Targeted preventive measures need to be taken in different production scenarios.

Processing Machinery degradation discolorationthermal degradationscrew speedresidence timeantioxidant

Q

Random copolymer polypropylene pipe special material (Nordic standard） PPR pipe cyclic pressure fatigue failure（Variant: Strengthened Measures）

A

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

Extrusion & Post fatigue failurePPRstress concentrationinner wall qualityweld bead

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