Extrusion & Post
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Die marks/lines appearing on polyolefin plastomer extruded products (Variant: Enhanced Measures)
Fenómeno do problema
Continuous lines or marks appear on the extrudate surface along the extrusion direction, with fixed positions.
Die marks affect the product appearance and are particularly obvious in transparent products and films.
In particular, additional attention is needed on the original basis; this problem is more prominent and requires focused attention.
Análise das causas
（1）The die inner wall has scratches or damage
（2）Impurities or carbides accumulate in the die
（3）The die flow channel design is unreasonable, with stagnation zones
（4）The die joint is uneven
（5）The breaker plate or screen is damaged and impurities pass through
（6）On the original basis, additional attention is needed: fluctuations in process parameters or changes in equipment status have aggravated this problem
Solução
（1）Disassemble the mold and check the die inner wall; scratches need to be ground and polished for repair
（2）Clean the impurities and carbides in the die, using copper tools to avoid damage
（3）Optimize the die flow channel design to eliminate stagnation dead corners
（4）Grind the die joint flat to ensure no steps
（5）Replace the breaker plate and screen, and replace them regularly to prevent damage
（6）And strengthen process monitoring; on the original basis, additional attention is needed to pay special attention to parameter stability
Conclusão principal
Die marks are caused by damage to the die inner wall or impurities, and the die condition needs to be regularly cleaned and checked.
Targeted preventive measures need to be taken in different production scenarios.
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