Combining room: • The first oven's temperature: • the pre-laminated glass may get crack if the temperature is too low • The pre-laminated glass edge will get sealed earlier than expected if the temperature is too high • The second oven's temperature: • If temperature is too low, the pre-laminated glass edge can not be sealed smoothly and the adhesion is not good; • If temperature is too high, bubbles will be produced.

1. Pre-pressing Pre-laminated Glass with Polyvinyl Butyral PVB film
• If the air is not expelled completely:
• Bubbles may appear;
• It may cause delamination;
• The laminated glass' thermal stability is not good;
• The glass may get cracked inside the autoclave.

2. CNCGLASS PVB FILM

3. Pre-pressing Pre-laminated Glass with Polyvinyl Butyral PVB film
• Air expelling, prepressing and edge sealing when making
PVB laminated glass
• Two ovens and two times of roll extrusion
• Clean the glass
• Temperature: 20-25℃, humidity:25%+/- 2%
• Prepressing oven
• Prepressing oven

4. Pre-pressing Pre-laminated Glass with Polyvinyl Butyral PVB film
• Combining room:
• The first oven's temperature:
• the pre-laminated glass may get crack if the temperature is
too low
• The pre-laminated glass edge will get sealed earlier than
expected if the temperature is too high
• The second oven's temperature:
• If temperature is too low, the pre-laminated glass edge can
not be sealed smoothly and the adhesion is not good;
• If temperature is too high, bubbles will be produced.

5. Pre-pressing Pre-laminated Glass with Polyvinyl Butyral PVB film
• Conditions for prepressing and expelling air when laminating
glass with PVB Film
• Roll extrusion way on the flat layer:
• The first roller: the glass surface temperature is about 35℃,
with pressure 5-7 bar; and the gap between two rollers is
about 10% smaller than the glass total thickness.
• The second roller: the glass surface temperature is 65-75℃，
with pressure 5-7bar; and the gap between two rollers is
15% -20% smaller than the glass total thickness.

6. Pre-pressing Pre-laminated Glass with Polyvinyl Butyral PVB film
• Vacuuming way on the curved laminating layer:
• Vacuum ring: silicone vacuum bag
• Cold pumping:
• Temperature : 20-30℃; 22℃ is suggested.
• Vacuum degree: 550 -660mm HG;
• Time: About 5-20 minutes.
• Heat pumping:
• Glass surface temperature: 95-105℃
• Time: less than 25 minutes

7. Pre-pressing Pre-laminated Glass with Polyvinyl Butyral PVB film
• Air expelling when laminating safety glass with PVB Film
• Factors affecting normal air expelling:
• Temperature required for glass is lower than 25℃, and for
PVB lower than 18 ℃。
• Cold pumping time is at least 5-20 minutes, with
temperature 22℃.
• Vacuum degree: absolute vacuum 80% (latm/100kPa)
• Vacuum ring's temperature: lower than 30 ℃. 20-25 ℃ is
recommended.
• Rheology and the grains on PVB Film's surface
• Glass's thickness
• Each glass is not matched very well to the other glass after
hot bending

8. CNCGLASS PVB FILM

9. CNCGLASS PVB FILM
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10. CNCGLASS PVB FILM