The following methods can be adopted:
① Carry out pre-drying treatment.
For example, a polycarbonate sheet with a thickness of 0.5mm should be dried for 1-2h at a temperature of 125-130, a sheet with a thickness of 3mm should be dried for 6-7h; a sheet with a thickness of 3mm should be dried for 1-2h at a temperature of 80-90 , And it should be thermoformed immediately after drying.
② Pre-heat treatment.
③ Change the heating method to double-sided heating.
Especially when the thickness of the sheet is more than 2mm, double-sided heating must be adopted.
④ Do not open the moisture-proof packaging of the sheet prematurely.
It should be unpacked and molded immediately before thermoforming.
