Problem & Solution

Q

Random copolymer polypropylene pipe special material (Nordic standard） extruded products excessive shrinkage rate（Variant: Mass Production Scenario）

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） extrusion process unstable output/surging（Variant: Strengthened Measures）

A

Unstable output is caused by unstable solids conveying, requiring optimization of barrel temperature and the feeding system.Targeted preventive measures need to be taken in different production scenarios.

Extrusion & Post unstable outputsurgingsolids conveyinghopper bridgingscrew speed

Q

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

A

Dimensional fluctuation is caused by unstable extrusion or hauling, requiring systematic stabilization of all process parameters.Targeted preventive measures need to be taken in different production scenarios.

Extrusion & Post dimensional fluctuationscrew speedhaul-off speedtemperature stabilityuniform feeding

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 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） 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） 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

Q

Random copolymer polypropylene pipe special material (Nordic standard） PPR pipe thermal aging performance substandard（Variant: Strengthened Measures）

A

Substandard thermal aging performance is caused by an insufficient antioxidant system, and needs to be solved from formulation and processing temperature control.Targeted preventive measures need to be taken in different production scenarios.

Extrusion & Post thermal agingantioxidantPPRoxidation induction timeextrusion temperature

Q

Random copolymer polypropylene pipe special material (Nordic standard） extruded pipe uneven wall thickness（Variant: Mass Production Scenario）

A

Uneven wall thickness is caused by uneven die gap or uneven temperature, and needs to be solved from mold precision and temperature uniformity.Targeted preventive measures need to be taken in different production scenarios.

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

Q

Random copolymer polypropylene pipe special material (Nordic standard） extruded pipe uneven wall thickness（Variant: Strengthened Measures）

A

Uneven wall thickness is caused by uneven die gap or uneven temperature, and needs to be solved from mold precision and temperature uniformity.Targeted preventive measures need to be taken in different production scenarios.

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

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