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.

TRANSCRIPT

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.

CNCGLASS PVB FILM

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

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.

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.

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

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

CNCGLASS PVB FILM

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,

CNCGLASS PVB FILM

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