How to Process Laminated Glass with EVA Film Interlayer
How Do You Process Laminated Glass with EVA Film?
1)Processing the Laminated Glass with EVA Film is different from the
laminating with PVB Film.
Different in Oven: Laminating with PVB Film you need autoclave;
laminating with EVA Film you need a simple oven: one-step laminating
oven which is simpler and easier to process, and less cost to install.
2)Install the ONE-Step of vacuum laminating Oven
Make sure the silicone vacuuming bag is great, and the heating is even
inside the oven.
3)Combine the pre-laminated glass
Normal the combination is :GLASS+EVA FILM+GLASS
Cut the extra EVA Film gently.
Solid the pre-laminated glass with high-temperature tape
4) Put the pre-laminated glass inside silicone vacuum bag
Seal the silicone vacuum bag.
Start vacuum pump, double check the vacuuming is working well, and the
value of vacuum pump reaches the requirement.
5)Heating in two temperature stages
Normally, the heating will be set in two stage:
Low temperature stage: 60 degrees C for 15 minutes
High temperature stage:130 degrees C for 40 minutes
6)Do NOT stop vacuuming after the laminated glass is cool as room temperature
Don’t stop vacuuming until the laminated glass is cool to the room
temperature, Or the bubbles will come out inside the laminated glass.
Preparation for Glass Lamination with EVA Film
Preparation for Lamination:
1)Cut the glass as the size you want, and use Glass Edging Machines to
shape the edges of the glasses, which will avoid the glasses hurt the
silicon vacuum bag.
2)Use the purified water, deionized water, industrial alcohol or
Ethanol to clean the glasses, then use the clean hot wind to dry the
glasses. Make sure no black spot, water mark, finger print etc on the
glasses.
Pre-Laminating:
1)Put the EVA FILM on the bottom glass, make sure the EVA Film is
plain, then put the other glass on the EVA Film, then use the
high-temperature-resistance tape to solid the pre-laminated glass.
2)Cut the extra EVA FILM that outside the pre-laminated glass. Don’t
pull the EVA Film hard to avoid the remove of the EVA Film. Cutting
out the extra EVA Film can void the extra EVA Film melting and sealing
the edges of the laminating glass and hold back vacuuming.
3)When you put the pre-laminated glass in the silicon bag, make sure
that each pre-laminated glass is 3-5cm away from each other to help
vacuuming.
4)To help vacuuming, you can also put the wooden bar around the
silicon bag to help vacuuming.
Notes: if you seal the pre-laminated glass totally with tape, you need
to make some small holes on the tapes to help vacuuming.
Heating Procedures of Laminating Glass with EVA Film
1)Before the silicon bag shelf being pushed into the oven, start the
vacuum pump to vacuuming for 3-5five mins. Check whether the silicon
bag is leaking or not. And the vacuum value should at least be
0.095Mpa.
2)Push the silicon bag shelf into the oven, then set the parameters of
temperature and time. Following two STAGE heating temperature and
time. The low temperature stage is 60degress C and 15mins. And the
high temperature stage is 130 degree C and 40 mins (notes:following
the instructions that the EVA FILM MANUFACTURERS give to you, the
parameters maybe different for different manufacturers). Because it
takes time for the heat transfer through the silicon bag, so the
temperature the detector gets may be different from the real
temperature of the laminated glass.
3)Stop heating. Wait till the temperature is lower than 75 degrees,
then open the oven door and pull out the silicon shelf to help
cooling. But don’t open the silicon bag or let cold water touch the
laminated glass.
4)After the temperature is lower than 45 degree, now you can open the
silicon bag and check the laminated glass.
Processing Temperature and Time for Laminating Glass with EVA FILM
First I would to say that no fixed standard value for the processing
parameters, because different EVA film manufacturer have different
formula for the EVA FILM, and different glass laminating machine
manufacturer have different property for the machine.What’s more, the
weather and moisture is different in different regions, which also
would affect the processing parameters. So there is no fixed standard
value for the processing temperature and time for laminating glass
with EVA FILM.
But I can tell you some general rules of the processing parameters for
laminating glass with EVA FILM.
1) Indoor EVA FILM (like 110 degrees C) need lower temperature for
laminating than outdoor EVA FILM (130 degrees C).
2) If you laminating thicker glass with more layers of EVA FILM, then
the keeping time should be longer, for example if 5mmglass+0.38mm EVA
FILM +5mm glass is 130 degree and 40 min, then 10mm glass+2layer EVA
FILM +10mm glass should be 130 degree and 55mins.
Because more time is needed for the heat pass through the thicker
glass and more layer of EVA FILM.
3) The tempered glass laminating with EVA FILM needs longer keeping
time than the flat glass laminating with EVA FILM.
4) If the weather is colder in your region, then the keeping time
should be longer.
And it’s also different for different glass laminating machine,
because the heating part is different.
So :
1) If you change the EVA FILM supplier, maybe you have to adjusting
the processing parameters for laminating glass with EVA FILM.
2) If you buy a new EVA glass laminating machine, and the processing
parameters maybe different from your older one.
3) If the weather changes from different seasons, maybe you also need
to adjust the processing parameters for laminating glass with EVA
FILM.
4) Yes, every EVA FILM Manufacturers would offer you the processing
instructions or parameters for laminating glass with EVA FILM, but you
don’t have to follow them exactly. You should change some according to
your real situation.
Why Two Periods of Temperature for Laminating Glass with EVA FILM?
1)Low temperature period can help vacuuming, at this temperature the
EVA Film is still not melted, but the temperature is higher than room
temperature, the numerators of air would move faster, which is helpful
for the vacuuming. If vacuuming is not good, the bubbles would come
out the laminated glass.
2)If the moisture in your place is high, and maybe the EVA FILM has
already absorbed some moisture, the low temperature period would help
dry the EVA FILM before the EVA FILM start to melt, which can avoid
bubbles and be good for the adhesion of the EVA FILM.
3)If you wash the glass, and maybe the glasses are not dry enough, the
low temperature period can help dry the glasses.
For laminating with papers, if you print ink in the papers are not dry
enough, the low temperature period can help dry the print ink.
4)And also, after the low temperature period, the machine is stay hot
too, so temperature detector can measure a more correct temperature
closer to real temperature of the laminated glass.
Notes of Making Laminated Glass with EVA Interlayer Film
1).Glass is not a good conductor of heat, so please don’t laminate
different thickness of glasses at the same silicon bag. It’s more
easily for the thin laminated glass with EVA Interlayer Film to
transfer heat, so the keeping heating time at high temperature can be
shorter. And if the laminated glass is thicker, the keeping heating
time for the high temperature should be longer.
2).For the different thickness of the fabric or papers, the thickness
of EVA interlayer film should be different. For the thin and small
silk, the 0.25 thickness EVA interlayer film would be ok. For the
thicker and bigger silk or fabric, the thickness of EVA Interlayer
Film should be 0.38mm or more.
3).Normally, the EVA Interlayer Film is soften at 75 degree C and
start to react at about 100 degree C. And the EVA Interlayer Film
would be totally melted at about 115 degree C. Generally speaking,
when the detector gets the temperature of 120degree C, the real
temperature of EVA Interlayer Film gets 115 degree C.
4).The mobility of different thickness of EVA Interlayer Films is
different when being heated. The mobility of thicker EVA Interlayer
Film is more than the thinner EVA Interlayer Film. So please adjust
the time of high-temperature-period of different thickness EVA
Interlayer Film. If the high-temperature-period is too long, the
melted EVA Film Interlayer would leak from the laminated glass, which
will cause bubbles in the edges of laminated glass.
5).The quality of laminated glass is partly decided by the plainness
of the glasses. So please try to select the good plainness of flat
glass. If you are laminating with tempered glass, please use the
thicker EVA Film Interlayer. For the poor plainness glass, the
laminated glass may be broken when vacuuming or cause bubbles of
laminated glass.
China Ethylene-vinyl acetate EVA Interlayer Film Manufacturer for
Safety Architectural Laminated Glass.
China EVA Film for Smart Glass, Privacy Glass, LED Glass etc.
China Solar EVA Film for Solar Panel Encapsulation.
China Switchable Film for Privacy Glass, Smart Glass.
[
cnc@cncnext.com /
www.cncnext.com /
benext77@gmail.com /
benext77@hotmail.com) (
eva@evafilms.com /
www.evafilms.com ]
Sponsored by:
China Ucolin Glass Lamination Solution Experts:
-Silicone Vacuuming Bag for EVA Glass Laminating Machine/Privacy
Glass Laminating
-Silicone Rubber Sheet Manufacturer for Solar EVA Photovoltaic Panel
Encapsulation
(
uc@ucolin.com /
www.ucolin.com /
umewe360@gmail.com/
umewe360@hotmail.com)