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Random copolymer polypropylene pipe special material (Nordic standard） pipe inner and outer wall roughness

Pipe wall roughness is caused by low mold temperature or poor surface condition, and needs to be solved from temperature control and mold maintenance.

Material Drying pipe wall roughnessdie temperaturemandrel temperaturemold polishingsizing sleeve

Random copolymer polypropylene pipe special material (Nordic standard） pipe pressure resistance test unqualified

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.

Processing Machinery pressure resistance testpipe wall thicknessmaterial degradationcrystallinityplasticization quality

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

Haul-off speed mismatch needs to be solved by precisely adjusting haul-off parameters and ensuring stable hauling.

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

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

PE temperature window optimization needs to be advanced from two aspects: systematic experiments and experience accumulation.

Processing Machinery temperature optimizationPE gradeDOEprocess parameterstemperature database

Random copolymer polypropylene pipe special material (Nordic standard） extruder frequent screen change/short filter screen life

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.

Processing Machinery filter screenimpuritiescarbidesbarrel temperaturescreen change frequency

Random copolymer polypropylene pipe special material (Nordic standard） extrusion process unstable output/surging

Unstable output is caused by unstable solids conveying, requiring optimization of barrel temperature and the feeding system.

Extrusion & Post unstable outputsurgingsolids conveyinghopper bridgingscrew speed

Random copolymer polypropylene pipe special material (Nordic standard） extruded products dimensional fluctuation

Dimensional fluctuation is caused by unstable extrusion or hauling, requiring systematic stabilization of all process parameters.

Extrusion & Post dimensional fluctuationscrew speedhaul-off speedtemperature stabilityuniform feeding

Random copolymer polypropylene pipe special material (Nordic standard） extruded products excessive shrinkage rate

Excessive shrinkage rate 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

Random copolymer polypropylene pipe special material (Nordic standard） extruded products surface lusterless

A lusterless surface is caused by low die temperature or too fast cooling, requiring increased die temperature and slowed cooling.

Material Analysis lusterlessdie temperaturecooling ratedie polishingmelt temperature

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

The production environment is an important factor affecting processing quality, requiring the establishment of a sound environmental control system.

Material Drying environmental controlworkshop temperaturehumiditycooling water temperatureprocess stability

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