Problema e solução

Respostas práticas para os desafios comuns dos materiais plásticos

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Q

HDPE film gel particles and fisheyes

A

Gel particles are the most common appearance defect of film; the three lines of defense of filtration, mixing and cleanliness are all indispensable.; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence

Extrusion & Post HDPE; film; gel particle; fisheye; screen; mixing

Q

HDPE pipe dimensional instability

A

Dimensional stability depends on the dual stability of temperature and haul-off; melt pressure monitoring is a direct window into discharge stability.; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence

Extrusion & Post HDPE; pipe; dimension; fluctuation; temperature; haul-off

Q

HDPE pipe screw wear and output decline

A

Screw wear is a chronic performance decline; melt pressure and output trend monitoring can provide early warning and avoid sudden quality accidents.; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence

Extrusion & Post HDPE; pipe; screw wear; output; melt pressure; monitoring

Q

HDPE pipe haul-off skew deformation

A

Haul-off alignment is the foundation of pipe straightness; the deviation direction is the direction of deviation, and full-line laser alignment is an efficient troubleshooting means.; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence

Extrusion & Post HDPE; pipe; haul-off; centerline; deformation; alignment

Q

HDPE pipe outer diameter out of tolerance

A

Outer diameter control relies on the linkage of the three elements: vacuum degree, haul-off speed, and sizing sleeve; for outer diameter drift, first check sizing sleeve wear, then check the stability of vacuum and haul-off.; after confirming effectiveness, fix the parameters and practices into t...

Extrusion & Post HDPE; pipe; outer diameter; out of tolerance; vacuum degree; sizing sleeve

Q

HDPE pipe inner wall chatter rings

A

Inner wall chatter rings are a typical manifestation of coordination problems between vacuum sizing and haul-off; checking item by item in the order of water outlet, vacuum, seal, and haul-off usually locates and eliminates it quickly.

Extrusion & Post HDPE; pipe; inner wall; chatter ring; vacuum sizing; haul-off

Q

HDPE extrusion screen clogs quickly

A

For fast screen clogging, first check the cleanliness of the material source.

Extrusion & Post HDPE; extrusion; screen; clogging; impurities

Q

HDPE film poor corona treatment

A

Corona effect = power + cleanliness + timeliness.

Extrusion & Post HDPE; film; corona; printing adhesion; slip agent

Q

HDPE extrusion head pressure fluctuation

A

Tracing pressure fluctuation: material, screw, screen, temperature.

Extrusion & Post HDPE; extrusion; pressure fluctuation; feeding; screen

Q

HDPE extrusion sheet melt fracture

A

Exit roughness = raise temperature, reduce speed, add aid.

Extrusion & Post HDPE; extrusion; melt fracture; die; PPA

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