Extrusion & Post
12 مشاهدة
PMMA Extruded Sheet Stress Streaks
ظاهرة المشكلة
Sheets show stress streaks under polarized light, and crack along the streaks during hot bending or engraving.
تحليل الأسباب
Mismatched extrusion haul-off and cooling freezes orientation stress in the sheet; too-low roll temperature and too-fast haul-off both increase residual stress.; During on-site troubleshooting, verify item by item according to this mechanism to avoid blindly adjusting the machine based on experience alone.
الحل
①Optimize three-roll temperature matching; ②reduce haul-off stress; ③anneal sheets; ④test stress distribution before processing.; After adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability.
الخلاصة الأساسية
The internal stress of extruded sheets affects secondary processing safety; stress testing and annealing are necessary preparations before further processing.; After confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence.
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