Extrusion & Post
13 مشاهدة
PVDF Weld Line Weak Strength
ظاهرة المشكلة
【Problem phenomenon】Multi-gate PVDF products crack at the weld line, and pressure tests leak from the weld line
تحليل الأسباب
When two melt fronts converge, insufficient molecular entanglement forms a weak interface, and the solidified film at the front of semi-crystalline materials further hinders fusion; in-die confluence in extrusion similarly produces in-die weld lines
الحل
Increase melt temperature, mold temperature, and holding pressure to promote fusion; change multi-gate to single gate or adjust positions so the weld line avoids pressure-bearing areas; lengthen the mixing section after confluence in the extrusion die to increase molecular entanglement
الخلاصة الأساسية
PVDF weld lines rely on temperature to promote fusion plus structural avoidance; pressure-bearing parts must be checked at weld positions; 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!