Material Drying
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PMMA Sheet Hot Bending Bubbles
Fenómeno del problema
After hot bending, bubbles appear in the bending area of the sheet, and transparency is locally lost
Análisis de la causa
The hot bending temperature is too high or the sheet has absorbed moisture; during heating, the moisture vaporizes or the material locally overheats and decomposes to produce gas; the risk is significant when 3mm sheets have not been dried for more than 12 hours
Solución
①Dry the sheet at 80-90℃, at least 12 hours for 3mm sheets; ②lower the hot bending heating temperature and control the time; ③step cooling after hot bending to release stress
Conclusión clave
Hot bending bubbles are a dual loss of control of moisture and temperature; doubling the pre-drying time according to thickness is the fundamental way to prevent bubbles; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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