Prepressing and air expelling when laminating glass with POLYVINYL BUTYRAL PVB FILM

Prepressing and air expelling when laminating glass with POLYVINYL
BUTYRAL PVB FILM
Purpose:
To get rid of the air leaving between the glass and the film
To pre-combine the glass and the film before it’s put into the autoclave
To seal up the edge in order to avoid the air permeating into the
laminated glass again.

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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