Pre-pressing Pre-laminated Glass with Polyvinyl Butyral PVB film
• If the air is not expelled completely:
• Bubbles may ap...
CNCGLASS PVB FILM
Pre-pressing Pre-laminated Glass with Polyvinyl Butyral PVB film
• Air expelling, prepressing and edge sealing when making...
Pre-pressing Pre-laminated Glass with Polyvinyl Butyral PVB film
• Combining room:
• The first oven's temperature:
• the p...
Pre-pressing Pre-laminated Glass with Polyvinyl Butyral PVB film
• Conditions for prepressing and expelling air when lamin...
Pre-pressing Pre-laminated Glass with Polyvinyl Butyral PVB film
• Vacuuming way on the curved laminating layer:
• Vacuum ...
Pre-pressing Pre-laminated Glass with Polyvinyl Butyral PVB film
• Air expelling when laminating safety glass with PVB Fil...
CNCGLASS PVB FILM
CNCGLASS PVB FILM
• All rights reserved by
• CNC GLASS INTERLAYER TECH WWW.CNCGLASS.COM
• CNC@CNCGLASS.COM BENEXT77@GMAIL....
CNCGLASS PVB FILM
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Pre pressing pre-laminated glass with polyvinyl butyral pvb film

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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.

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Pre pressing pre-laminated glass with polyvinyl butyral pvb film

  1. 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. 2. CNCGLASS PVB FILM
  3. 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. 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. 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. 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. 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. 8. CNCGLASS PVB FILM
  9. 9. CNCGLASS PVB FILM • All rights reserved by • CNC GLASS INTERLAYER TECH WWW.CNCGLASS.COM • CNC@CNCGLASS.COM BENEXT77@GMAIL.COM • 008615013829504 Skype: CNEXT365 Wechat: WECAN365 Line: CNCGLASS • EVA film for laminated glass, PVB film, PDLC smart galss film, Glass hardware,
  10. 10. CNCGLASS PVB FILM

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