Processing Machinery
6 مشاهدة
TPU screw design low shear
ظاهرة المشكلة
Processing TPU with a general-purpose screw causes shear degradation leading to product discoloration and performance decline
تحليل الأسباب
TPU recommends a single-flighted three-zone screw with a compression ratio of 1:2 to 1:3; excessive shear causes local overheating and degradation of the melt; the check valve prevents backflow and avoids dead zone retention
الحل
①select a special screw with a low compression ratio of 1:2-1:3; ②equip a check valve to prevent backflow; ③avoid dead zones in the barrel and nozzle; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
الخلاصة الأساسية
The TPU screw is a low-shear special part; a 1:2-1:3 compression ratio plus a check valve protects the material from the hardware; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
هل كان هذا مفيدًا؟
0 شخص وجدوا هذا مفيدًا
شكرًا لك على ملاحظاتك!