1. Pre-drying. For example, the polycarbonate sheet with a thickness of 0.5mm should be dried at a temperature of 125-130~C for 1-2h, and a PVC sheet with a thickness of 3mm should be dried for 6-7h; the plastic sheet with a thickness of 3mm should be dried at a temperature of 80-90'E Under drying for 1-2h, and thermoforming should be carried out immediately after drying.
2. preheat treatment.
3. Change the heating method to two-sided heating, especially when the thickness of the sheet is above 2nan, two-sided heating must be adopted.
4. do not open the moisture-proof packaging of the sheet prematurely, it should be unpacked and formed immediately before thermoforming.
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