Extrusion & Post
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Die marks/lines on random copolymer polypropylene pipe special material extruded products (Variant: strengthened measures)
Fenómeno do problema
Continuous lines or marks appear on the surface of the extrudate along the extrusion direction, with fixed positions.
Die marks affect the appearance of the product, and are especially obvious in transparent products and films.
In particular, extra attention is needed on the original basis, this problem is more prominent and needs key attention.
Análise das causas
（1）The die inner wall has scratches or damage
（2）Impurities or carbonized material accumulate in the die
（3）The die flow channel design is unreasonable, with stagnant areas
（4）The die joint is uneven
（5）The breaker plate or filter screen is broken, and impurities pass through
（6）On the original basis, extra attention is needed: process parameter fluctuations or equipment status changes have aggravated this problem
Solução
（1）Disassemble the mold and check the die inner wall, and grind and polish to repair scratches
（2）Clean the impurities and carbonized material in the die, using copper tools to avoid damage
（3）Optimize the die flow channel design to eliminate stagnant dead corners
（4）Grind the die joint flat to ensure no steps
（5）Replace the breaker plate and filter screen, and replace them regularly to prevent damage
（6）And strengthen process monitoring; on the original basis, extra attention is needed, with special attention to parameter stability
Conclusão principal
Die marks are caused by die inner wall damage or impurities, and the die condition needs to be cleaned and checked regularly.
In different production scenarios, targeted preventive measures need to be taken.
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