Problem & Solution

Practical answers to common plastic material challenges

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HDPE film poor opening

Opening is controlled by three controls: additives + tension + temperature.

Extrusion & Post HDPE; film; opening; blocking; slip agent

HDPE blown film thickness deviation

Transverse thickness goes back to the die lip and air ring.

Extrusion & Post HDPE; blown film; thickness deviation; die lip; air ring

HDPE blown film bubble instability

Stable bubble = stable extrusion + uniform air ring + quiet environment.

Extrusion & Post HDPE; blown film; bubble instability; air ring; extrusion fluctuation

HDPE film gel (fisheye)

Extrusion & Post HDPE; blown film; gel; fisheye; plasticization

HDPE extrusion screw slipping

For discharge pulsation, first check the feed section temperature and feeding.

Extrusion & Post HDPE; screw slipping; feed section; bridging; plasticization fluctuation

HDPE pipe outer surface roughness

Surface roughness: check temperature, raw material, and cleanliness.

Extrusion & Post HDPE; pipe; surface roughness; temperature; regrind

HDPE pipe ovality out of tolerance

Ovality = a synchronization problem of sizing + cooling + haul-off.

Extrusion & Post HDPE; pipe; ovality; vacuum sizing; haul-off

EVA film printing adhesion

Extrusion & Post EVA; film; printing; adhesion; corona; dyne value

EVA cable compound extrusion surface

Extrusion & Post EVA; cable compound; extrusion; surface; gel; plasticization

EVA film blocking

Extrusion & Post EVA; film; blocking; anti-blocking agent; cooling; tension

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