Preheating and exhaust of pvb film
After the glass and pvb interlayer film is combined, there are some air between the pvb interlayer film and the glasses. PVB Interlayer Film can dissolve some of air by itself, but not very much of it. To extrude the air out, here are the methods:
+hot roller extrude exhausting air
Hot roller exhausting air has many ways: single thermostat chamber with double rollers or double thermostat chanbers with double rollers.
Single thermostat chamber with double rollers: usually for laminating flat glass with pvb interlayer film. When prelaminated glass goes through the frist roller, most of air will be squeezed out. Then the prelaminated glass goes into the thermostat chamber to heat, then, go throug second roller to extrude exhaust after heating. At this most, air isolation and edge seal is finished at the same time, the pre-laminated glass looks prey translucent while the narrow erea around edge shows transparent.
The temperate control is very important, in order to expulsion of air and seal sides of prelaminated glass successfully, temperature should be kept about 70-80 degree after going through the second roller.
If you doesn’t find the prey translucent area after the second rolling, which means the glass temperature is too low. On the contrary, if the temperature is too high, edges of the prelaminated glass will be sealed too early, which will stop squeeze air out, then bubbles will appears in the laminated glass.
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