Problem & Solution

Practical answers to common plastic material challenges

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Unstable dimensions in PVA extrusion

Extrusion & Post PVA extrusion dimensional stability feeding control temperature PID haul-off synchronization

Die drool and carbon deposits at PVA extrusion die

Extrusion & Post PVA extrusion die carbon deposit PE flushing residence zone thermal oxidation

Delamination of PVA blended with incompatible resin

Extrusion & Post PVA blend delamination polarity difference PVA-g-MAH reactive compatibilization interfacial bonding

Connected pellets in PVA extrusion pelletizing

Extrusion & Post PVA pelletizing connected pellets pelletizing water temperature cutter speed elastic recovery

Melt fracture in PVA extrusion

Extrusion & Post PVA extrusion melt fracture elastic recovery die L/D extrusion rate

Internal delamination cracking of PU

Extrusion & Post PU internal delamination interfacial bonding compatibilizer uniform cooling

Snakeskin pattern on PU surface

Extrusion & Post PU snakeskin pattern extrusion temperature elastic recovery die temperature control

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

Large dimensional change of PU with temperature

Extrusion & Post PU dimensional temperature sensitivity thermal expansion coefficient rigid filler annealing treatment

Material overflow at PU vacuum section

Overflow is caused by low melt viscosity; temperature reduction and baffle are key

Extrusion & Post PU vacuum section overflow melt viscosity temperature reduction vent baffle

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