0731HOW TO MAKE PVB LAMINATED GLASS WITH PVB FILM POLYVINYL BUTYRAL(SECOND2-2)

HOW TO MAKE PVB LAMINATED GLASS WITH PVB FILM POLYVINYL BUTYRAL

HOW TO MAKE PVB LAMINATED GLASS WITH
PVB FILM POLYVINYL BUTYRAL(2-2)
BUTYRAL(2-2)
By Peter Shin
www.HelloGlass.com

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.
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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

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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(1)-Silicone Vacuuming Bag for EVA Glass Laminating Machine/Privacy Glass Laminating
(2)-Silicone Sheet for EVA Glass Laminating Machine
(3)-Silicone Bag for PVB Glass Laminating Auto-clave
(4)-Silicone Rubber Sheet for Solar Cell Module Laminating Machine
(5)-Silicone Sheet for Wood Door Vacuum Laminating Machine Vacuum Press Machine Vacuum
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Contact Us: uc@ucolin.com / www.ucolin.com
umewe360@gmail.com/ umewe360@hotmail.com


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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.

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℃
Filming Machine


Time: less than 25 minutes

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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

====================================
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Vacuum Filming Machine
=====================================

Autoclave when laminating safety glass with PVB interlayer film
Purpose:
Dissolves the residuary air inside the PVB film
Allows PVB film flows and combine with the glass
Obtain required performance and transparency

Basic condition and requirement:
Temperature and pressure can get increased simultaneously, but the pressure can not get
increased to quickly.
Pre-laminated Glass's constant temperature: 135-145℃
Pre-laminated Glass's pressure under constant temperature: 12-14 bar
Time for constant temperature and pressure: at least 20 minutes
Filming Machine


Temperature for releasing pressure: under 50℃

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Autoclave's working principle when laminating safety glass with Polyvinyl Butyral PVB film:
PVB film:
shapeless polymer
Appears adhesive under low temperature
Appears flowable under high temperature

Temperature: enable the PVB film to flow and get shaped permanently
Pressure: enhance the adhesion between PVB film and glass
Time: allows PVB film to become flowable

Notes: the thicker the glass, the longer time for the autoclave's cycle.

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Common problems for autoclave when laminating safety glass with Polyvinyl Butyral PVB
film
Filming Machine


=Pressure get increase too quickly: the PVB film stays cool inside the autoclave; and it will
cause the air running through if the glass edge was not sealed well or hot bending did not
go well.

=Pressure get increase too slowly: the air rest inside the PVB film will get expanding if the
temperature increases too fast, and becomes bubbles that will rift the glass edge.

=the time for constant temperature and pressure is too short:
The PVB film does not flow completely, and so it can not got contact with the glass
completely
The adhesion becomes worse;
The glass clearness will get reduced consequently

=the temperature is too high when releasing pressure:
The PVB film is still too hot and soft at the meantime;
The high pressure air get together inside the glass edge, and get saturation;
If the pressure reduce too suddenly, the air under high pressure will get expanded inside
the soft film and becomes bubbles;
The air under high pressure will diffuse from the glass center to the glass edge and later
becomes bubbles because the pressure in the edge is lower.

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Vacuum Filming Machine

Filming Machine

0731HOW TO MAKE PVB LAMINATED GLASS WITH PVB FILM POLYVINYL BUTYRAL(SECOND2-2)

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0731HOW TO MAKE PVB LAMINATED GLASS WITH PVB FILM POLYVINYL BUTYRAL(SECOND2-2)