Problem & Solution

Practical answers to common plastic material challenges

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HDPE pipe crystallization difference after sag

Material Analysis HDPE; pipe; crystallinity; cooling; thick wall; aging

HDPE pipe plasticization temperature too high

Molds & Tooling HDPE; pipe; plasticization temperature; degradation; mold core; screw

HDPE pipe roundness out of tolerance

Processing Machinery HDPE; pipe; roundness; ellipse; nozzle; sizing sleeve

HDPE pipe outer diameter out of tolerance

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

HDPE pipe inner wall chatter rings

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

HDPE injection molded product strength decline

Strength decline with normal appearance = a material history problem.

Material Drying HDPE; strength; regrind; degradation; weld line

HDPE pipe low welding strength

Weld strength = end face treatment + parameter standardization.

Molding Process HDPE; pipe; butt fusion welding; weld seam; end face

HDPE film slitting rough edge

For rough edge, check the blade, tension, and temperature.

Molding Process HDPE; film; slitting; rough edge; tension

HDPE injection molded product yellowing

Yellowing = heat history exceeding the standard.

Injection Molding HDPE; yellowing; degradation; melt temperature; antioxidant

HDPE film gel particles - black speck startup type

Startup black specks = a shutdown management problem.

Processing Machinery HDPE; film; black speck; startup; carbonization

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