Reasons for having Bubbles when making laminated glass

Reasons for having Bubbles when making laminated glass

First situation:
The plainness of tempered glass is bad.

As you known, tempered glass is less plain than the flat glass.
So you should choose a company that produce better tempered glass.

Since the tempered glass' plainness is worse than flat glass,
you should use thicker EVA interlayer for the tempered glass.
Generally speaking, the tempered glass should be laminated with at least 0.76 mm thickness EVA interlayer.

Second situation:
If you laminate too many layers ‘pre-laminated glass’ in a silicone bag at one time,
the vacuuming would not work perfect and cause the bubbles.

If you laminated small pieces ‘pre-laminated glasses’ at the same time,
put the ‘pre–laminated glasses’ on the Teflon mesh ,
which will help vacuum,
and the Teflon mesh should cover the vacuum hole
to make sure the vacuum hole is not sealed by the silicone bag itself.

Third situation：
Check if the silicon bag is leaking.
Averagely speaking, a silicone bag can be used for 2 or more years.
But checking the silicone bag if your laminated glasses have bubbles.
Check if the sealing buckle of the edge of silicone bag is sealed perfectly
when processing laminated glass with EVA INTERLAYER.

Fourth situation:
It's too early to pull the laminating glass out of the oven,
The temperature of laminated glass is still very high
and the EVA INTERLAYER is still melting and reacting.
When the laminated glass is getting cold,
the melted EVA INTERLAYER is contracting,
and the EVA INTERLAYER can't fully fill the gap between two glasses,
so bubbles come out in edges.

Fifth situation:
It's too early to stop vacuuming.
And the cross link reaction of the EVA INTERLAYER is not totally finished and stable.
And also the silicone bag would suck some air back in to the bag,
which cause the bubbles.
So generally speaking, don't stop vacuuming
until the temperature of the laminated glass is lower than 45 degrees C or close to your room temperature.

Note that always remember to put the Teflon mesh on the vacuuming hole to make sure the vacuuming is not stopped by the laminated glass upon the hole.


Peter Lin
Mail: [email protected] [email protected]
Whatsapp: 0086 15013829504
CNC Glass Interlayer
www.cncglass.com www.c-n-c.com
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