pre pressing pre-laminated glass with polyvinyl butyral pvb film
DESCRIPTION
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
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CNCGLASS PVB FILM