Re: PVA for gum printing

From: MARTINM <martinm@SoftHome.net>
Subject: Re: PVA for gum printing
Date: Wed, 08 Sep 2004 08:45:04 +0200

> One source classifies ESTAR as polyethylene terephthalate (PET) and
> the other one, probably more likely so, points out it was formed of
> unsaturated polyester (UP). The latter would be significantly
> different from PET.

Why do you say that?

Poly(ethylene terephthalate) is a polyester. Do you see the bond
between O of the terephthalate and carbon of the ethylene group?

As far as I know, all polyesters that are used as an emulsion
substrate are poly(ethylene terephthalate) and they all have the
coating difficulty you described. However, they are preferred because
of mechanical strength, dimensional stability, chemical stability,
archivalness, and what not.

You can find some of the polyester films that are available pre-subbed
with gelatin. One is from Grafix in their Duralar line. I am curious
about that product but I haven't got to try it myself yet.

--
Ryuji Suzuki
"You have to realize that junk is not the problem in and of itself.
Junk is the symptom, not the problem."
(Bob Dylan 1971; source: No Direction Home by Robert Shelton)