Problem & Solution

Q

Random copolymer polypropylene pipe special material (Nordic standard） pipe pressure resistance test unqualified（Variant: Strengthened Measures）

A

Unqualified pressure resistance is caused by insufficient wall thickness, material degradation or internal defects, and needs to be systematically solved from process and material quality.Targeted preventive measures need to be taken in different production scenarios.

Processing Machinery pressure resistance testpipe wall thicknessmaterial degradationcrystallinityplasticization quality

Q

Random copolymer polypropylene pipe special material (Nordic standard） extruded products haul-off speed mismatch（Variant: Strengthened Measures）

A

Haul-off speed mismatch needs to be solved by precisely adjusting haul-off parameters and ensuring stable hauling.Targeted preventive measures need to be taken in different production scenarios.

Extrusion & Post haul-off speedspeed matchinghaul-off slippingclamping forcehaul-off control

Q

Random copolymer polypropylene pipe special material (Nordic standard） PE raw material wide temperature window causing process parameter optimization difficulty（Variant: Strengthened Measures）

A

PE temperature window optimization needs to be advanced from two aspects: systematic experiments and experience accumulation.Targeted preventive measures need to be taken in different production scenarios.

Processing Machinery temperature optimizationPE gradeDOEprocess parameterstemperature database

Q

Random copolymer polypropylene pipe special material (Nordic standard） extrusion process unstable output/surging（Variant: Mass Production Scenario）

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: Mass Production Scenario）

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） 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） extruder frequent screen change/short filter screen life（Variant: Strengthened Measures）

A

Frequent filter screen clogging is caused by raw material impurities or improper process, and needs to be solved from raw material management and temperature control.Targeted preventive measures need to be taken in different production scenarios.

Processing Machinery filter screenimpuritiescarbidesbarrel temperaturescreen change frequency

Q

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

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） 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

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