Problem & Solution

Practical answers to common plastic material challenges

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Difficult PVA purging

Processing Machinery PVAdifficult purgingadhesionPE flushingdedicated purging compound

PVA material changeover residue

Processing Machinery PVAchangeover residuepurging materialscrew disassemblydead zone cleaning

Fast PVA UV aging

Fast UV aging is caused by photo-oxidation; UV absorber and HALS are the key

Material Analysis PVAUV agingUV absorberHALSradical scavenging

Unstable PVA shrinkage rate

Material Analysis PVAshrinkage ratebatch differencetemperature control stabilitycrystallization consistency

Coarse internal crystallization of PVA

Molding Process PVAcoarse crystallizationspherulite refinementnucleating agentcooling rate

Unstable weight of PVA injection molded products

Product weight stability depends on shot volume precision and holding consistency

Injection Molding PVA injectionweight fluctuationshot volumeholding consistencyV/P switchover

Poor PVA weather resistance

Material Analysis PVAweather resistanceUV absorberHALSphoto-oxidation

PVA extruded pipe ovality exceeds standard

Extrusion & Post PVA pipeovalityannular coolingvacuum sizinguniform haul-off

Large current fluctuation of PVA extruder

Extrusion & Post PVA extrusioncurrent fluctuationtemperature control precisionscrew designfeeding stability

PVA extruded film has gel particles

Extrusion & Post PVA filmgel particlemelting temperaturemixing sectionhigh molecular weight component

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