Extrusion & Post
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Flow marks on PETG extruded sheet
Problem Phenomenon
Flow line marks along the extrusion direction appear on the sheet surface.
Cause Analysis
The melt flow in the die head is uneven, the die head flow channel design has dead corners, and the extrusion temperature is uneven.
Solution
Optimize the die head flow channel design; balance the heating; increase the processing temperature to reduce the viscosity.
Key Takeaway
PETG sheet flow marks point to die head flow channel design problems.
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