Extrusion & Post
13 مشاهدة
PC annealing treatment specification
ظاهرة المشكلة
Product internal stress exceeds standard, transparent parts have optical distortion, and crack immediately after solvent wiping
تحليل الأسباب
Orientation stress frozen during molding is not released, and the product is in a metastable state; when encountering solvent, load, or temperature difference, stress release manifests as cracking; annealing can relax molecular chains back to stability
الحل
①Hot air circulation oven annealing at 110-130℃ for 2-4 hours, add 0.5 hour for every 1mm increase in thickness; ②Slow cooling after annealing ≤20℃/h; ③Annealing temperature takes 10-20℃ below the heat deflection temperature
الخلاصة الأساسية
Annealing is the standard post-treatment for PC to eliminate internal stress; temperature, time, and slow cooling three parameters are executed per specification, never fast-cool and waste previous efforts；After confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
هل كان هذا مفيدًا؟
0 شخص وجدوا هذا مفيدًا
شكرًا لك على ملاحظاتك!