Extrusion & Post
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PVC Profile Surface Streaks
Fenómeno del problema
Longitudinal light-dark streaks on profile surface, affecting appearance consistency, more obvious on co-extruded profiles.
Análisis de la causa
Periodic shedding of die buildup/exudates, die damage or uneven plasticization; unstable co-extrusion layer interface also shows streaks; streaks are the external manifestation of die condition and melt uniformity.
Solución
①Clean die buildup and foreign matter; ②Repair and polish die damaged areas; ③Improve plasticization quality, eliminate unplasticized particles; ④Check parameter matching of co-extrusion layers; ⑤Stabilize extrusion temperature and pressure.
Conclusión clave
PVC streaks = 'die condition + plasticization uniformity': buildup shedding, die damage, poor plasticization are the three sources; the regularity of streaks can infer whether it is periodic buildup or persistent damage.
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