High-pressure Molding of PVB Interlayer Film
+Maintaining Pressure Stage:
The temperature and pressure are very important parameters for making laminated glass successfully. When the temperature and pressure reach to the setted point (like 120-140 degrees), pay attenthion to these two parameters carefully. If the temperature is lower than 130 degree, the pressure time should be longer.But if the temperature is lower than 120 degree, it’s not helpful to keep the pressure time longer. And the laminated glass may be not adhensive or not very strong. If the pressure is less than 1.2-1.4MPA, the time for pressure should be longer, but at the same time, the temperature should be 120-140 degrees. If the temperature is higher than 160 degree, the pvb interlayer film will turn yellow. And the laminated glass is failure.
+ Cooling with pressure stage
After the maintaining pressure stage, it’s time to cooling the laminated glass. Still maintain the pressure and open the cooling water to reduce the temperature. When the temperature reaches 45 degree, strat to reduce the pressure. When open the autoclave door, check the temperature of the laminated glass up and down, make sure the temperature of the laminated glass is even. Don’t reduce the pressure too early, otherwise the bubbles would apper on the edges of the laminated glass.
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