Injection Molding
4 görüntüleme
Severe internal stress birefringence in PET injection molded parts
Sorun Belirtisi
Transparent PET products show dense colored fringes under a polariscope, indicating a high internal stress level.
Neden Analizi
Fast filling speed causes high molecular chain orientation that is not fully relaxed; mold temperature is low; cooling rate is too fast.
Çözüm
Reduce injection speed; increase mold temperature to 140-160°C; extend cooling time; anneal to eliminate stress.
Temel Çıkarım
PET birefringence is the optical manifestation of internal stress, especially important for optical-grade PET.
Bu faydalı oldu mu?
0 kişi bunu faydalı buldu
Geri bildiriminiz için teşekkürler!