Case Study: White Pattern on the Corner of PDLC Smart Laminated Glass

Case Study: White Pattern on the Corner of PDLC Smart Laminated Glass
Peter Lin

Problems:
I have an important inquiry regarding the smart film.
I have laminated the smart film properly, i have done so several
times. The issue is that in the corners sometimes a pattern appears
that affects the film. Please see the images below of just one
example.
- Can you tell me why this happens and if you have encountered before?
- Could you please also tell me how i can avoid this from happening?
It happens in different methods of laminating the film, as you can see
this time (images) i put some tape on the corners to see if this would
avoid the issue. I have laminated the film before without the tape and
the same happens.
To note: the Film still works and turns on and off.


Analyze
1-The pattern may be EVA Film bubbles. In the corner, the smart film
is less plain, there are more gaps between the smart film and the
glass. So you can try to laminate with thicker EVA Film to make sure
there are enough melting Eva film to fulfill the gaps and extrude the
airs out.

2-If you confirm the pattern is not Eva film bubbles, then if you turn
on the smart film, the pattern stays the same, then the result is that
the corner of PDLC smart film is unglued.
As we all known, the PDLC film itself is a combined layers film. The
reason that cause the unglue of PDLC smart film may be when you
cutting the PDLC smart film, you cause the unglue.
And also it may be the seal materials(like taps) you use do harm to
the PDLC smart film. Please carefully choose the seal materials tapes
you use. Make sure they are compatible with the PDLC smart glass film.

3-The EVA Film may expand with heat and contract with cold. So after
lamination, when cooling smart laminated glass, the EVA FILM may
expand with heat and contract with cold, which may force the unglue of
PDLC smart film. So you should use the EVA Film that is eliminated the
internal strength. For details of this issue, please read our file<Why
Switchable Film Break When Laminating with Glass and EVA Interlayer
Film？>


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