Extrusion & Post 8 views

PP Pipe Extrusion Inner Wall Ripples

Problem Phenomenon

Ripple-like undulations appear on the inner wall of PP-R pipes.

Cause Analysis

Uneven melt distribution between die and mandrel or pressure fluctuation; improper sizing sleeve cooling also causes inner wall defects.

Solution

①Check die head flow channels and spider; ②stabilize extrusion pressure; ③optimize sizing cooling; ④low-shear die head design to prevent degradation.

Key Takeaway

For inner wall ripples, check die head distribution and pressure stability.

PP-R;pipe;inner wall ripple;die head;sizing

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