Polyvinyl Butyral PVB interlayer film Vacuuming exhausting air
This method is specially for laminating uneven glass with pvb interlayer film, such as automobile windshield glass, bending glass.
Put the prelaminated glass into a vacuum bag or put vacuum rubber ring to seal the glass, then start the vacuum pump.
The procudure is divided into two steps: cold vacuuming period and hot vacuuming period. In the cold vacuuming period, the temperature is about 25 degrees and holding time about 15 minutes, and the negative pressure should be at least 0.8 bar. In the hot vacuuming period, temperature is about 80-110degrees, and holding time about 30 minutes.
And the most suitable temperature and time of hot vacuuming exhausting air depends on the machine and producing speed.The transparency of the laminated glass is better if it’s made of the hot vacuuming exhausting air method.
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