Bubbles Because Of Bad Vacuuming, EVA Laminated Glass Safety Glazing Case Study and Solutions By Peter Lin
Summary:
The bubbles of laminated glass with EVA interlayer film happened because of bad vacuuming, and the bad vacuuming was because the vacuum pump was completely choked.
The solutions is to clean the vacuum pump and renew it.
Dear Peter
We really suffer with the wastes in laminating glass with EVA interlayer film. Every week we recycle a big volume of laminating glass because of the bubble problem.
Most of them are Tempered glasses. However we can’t understand why some of laminated glass come up with good lamination in the end of the laminating cycle but some of them wrinkled and bubbles between two glasses. We use 0.76EVA+0.38EVA for tempered glass and never single 0.38EVA interlayer film.
We don’t understand the reason of this problem. In attachment I send you the images of the bubbled laminated glass we got last 2-3 cycle.
The heating process is like below :
30 minutes till 60 C
15 minutes stay in 60 C
45 minutes till 133 C
70 minutes stay in 133 C
Then cooling and keep vacuuming till 30 C
Can you suggest us where the problem could be.
Best Regards
Glazing E
Following are the photos of the failed laminated glass with bubbles:
Dear Glazier E
Our first analysis is: The vacuuming system is not strong enough. According the photos of laminated glass you sent to us, the bubbles area was big and gathered in one place, and close to edges, because the vacuuming is not strong enough to vacuuming them out. Please check your vacuuming value and the vacuum pump to see if it’s working well.
And we need to ask you some more questions to analyze the situation:
It’s the bubbles close to the position of the heating pipe of the oven?
Is the heating of the oven not well-distributed?
How many combinations of pre-laminated glass was put in each silicone vacuum bag?
Dear Peter
Here is the answer:
The vacuum indicates the minimum on the scale.
There are wrinkles mostly and they are close to the edges. You are right .
We will check the rotation of the air pumps.
We put mostly the two couple of laminated glasses on top each other. I mean in one floor two levels (6+0.76+6) to the top (6+0.76 + 6).
Soon anther email came from the Glazier E.
Dear Peter
Thank you very much for your kind assistance. We really appreciate it highly and we are really happy of cooperation with you.
We checked the vacuum pump and the Filter was completely choked. Today we cleaned it and will load some glasses in order to control the process. Now the problem is well solved.
Thank you for your professional help.
Dear Glazier E
You are welcome.
Peter Lin
Mail: cnc@cncglass.com benext77@hotmail.com
Skype: Cnext365
CNC Glass Interlayer
www.cncglass.com www.c-n-c.com
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