Problem & Solution

Practical answers to common plastic material challenges

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Internal unmelted particles of PU

Processing Machinery PU unmelted particles plasticizing capacity processing temperature screw mixing

Poor chemical resistance of PU

Material Analysis PU chemical resistance chemical attack slight crosslinking surface coating

Strong odor in PU processing

Material Analysis PU processing odor volatiles ventilation and exhaust temperature control

Large fluctuation of PU impact strength

Molding Process PU impact fluctuation dispersed phase particle size nucleating agent processing stability

Large creep deformation of PU

Large creep is caused by elastomer nature; slight crosslinking and rigid filler are key

Material Analysis PU creep slight crosslinking high molecular weight rigid filler

Insufficient tensile strength of PU

Material Analysis PU tensile strength molecular weight coupling agent orientation control

Internal shrinkage voids of PU

Molds & Tooling PU shrinkage void thick wall holding time gate freezing

Bubbles in PU elastomer casting

PU casting bubbles are caused by insufficient degassing; vacuum degassing is key

Material Analysis PU casting bubbles vacuum degassing casting temperature mixing degassing

PU processing temperature fluctuation

Molding Process PU temperature fluctuation PID tuning heater band thermocouple

PU screw slipping

Screw slipping is caused by premature melting; cooling the feed section is key

Extrusion & Post PU screw slipping feed section temperature premature melting flight deepening

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