Problem & Solution

Practical answers to common plastic material challenges

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HDPE '2079851475616104457 parison bubbles

For parison bubbles, check water first, then wear and regrind.

Material Drying HDPE; '2079851475616104457; bubbles; moisture; screw wear

HDPE '2079851475616104457 parison streaks

Streaks are investigated along three lines: pressure, regrind, and moisture.

Material Drying HDPE; '2079851475616104457; streaks; back pressure; moisture

HDPE '2079851475616104457 container melt fracture

For rough parison, first adjust the pressure-temperature combination.

Blow Molding HDPE; '2079851475616104457; melt fracture; sharkskin; regrind

HDPE '2079851475616104457 container excessive shrinkage

HDPE '2079851475616104457 shrinkage = temperature and blowing energy management.

Blow Molding HDPE; '2079851475616104457; shrinkage; mold temperature; blowing pressure

HDPE '2079851475616104457 parison die lines (Die Lines)

For parison line marks, clean the die first, then check the material.

Blow Molding HDPE; '2079851475616104457; die lines; die; buildup

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 black specks and impurities

Processing Machinery HDPE; pipe; black speck; carbonization; contamination

HDPE pipe outer surface roughness

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

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

HDPE pipe wall thickness unevenness

Molds & Tooling HDPE; pipe; wall thickness; unevenness; mold; thickness measurement

HDPE pipe ovality out of tolerance

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

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

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