The technology and parameters of PVB intermediate film for producing glass clip:
Glass Cutting、Glass Cleaning and PVB film cutting
Properly cut the glass at prcise size
1.Checkglass surface and remove grease and dusts, clean the glass by tap water .    
2.Rinse the glass by deineralized water/softened water. Water quality <30μs.Water hardness<10ppm,temperature is 40-60℃.  
3.Air dry the glass and keep it away from pollution
4.Pvb film should be cut at size of bigger than 2-5mm extra than glass size

Lamination room---temperature in lamination room should be 20-25℃,the humidity should be 23%±2%,the dusts proof, keep the machinery tidy,workers should keep the tidy uniform,hat and grove to present pvb film from dusts, contaminates and hair  Lamination conditions:   
a.the glass surface temperature 20℃-30℃,the upmost should not over 40℃       b.the pvb film temperature 20℃-25℃
c.check again the pvb film and glass is tidy and the glass size properly match the pvb film size.

Pre-Pressure Exhaustion
Cool Pumping and heat pumping
a.vacuum exhaust---compression vacuum degree should be at 580-680mmHg,remperature at 20_25℃,pressure at -0.095 to -0.1mpa.It takes around 20 minutes in continuously cool pumping,while 30 minutes in Un-Continuously Cool Puming                                                                        
b.Thermo Vacuum---the glass surface temperature should be at 100℃-120℃.It takes 30-45 minutes,pressure should be at -0.095 to -0.1MPA.The glass can be taken out when the temperature decrease to 60-80℃

Rolling Exhaust:
a.First thermostal:The heated laminated glass surface temperature is 30-40℃,first roller,pressure is 0.2-0.5Mpa,roller distance is 15%-20% less than laminated glass thickness.  
b.Keep the thermostal temperature by continuous work.

High Pressure Formation
the temperature and press rising is at low speed during whole procedure. The procedure below for reference:
Raise the temperature and pressure: temperature rise to 60℃,pressure to 0.4MPA,pressure to 0.8MPA,temperature to 90℃ ,pressure to 1.0MPA,temperature to 135-140℃,rise the temperature to 1.05-1.28MPA,keep the temperature 30-60 minutes, keep the pressure freely decreasing the temperature to 90℃,
temperature decrease to 45-55℃,release air.



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