With photographic RC papers, I believe that the consensus may be that there
is a resin coating on the bottom and the top of the paper substrata itself
with the emulsion layers on top of the top resin layer and another more
porous resin coating layer on top of the emulsion. Thus the paper itself is
protected from water and the chemicals while the emulsion is protected by a
different type of resin coating that enables the creation of surface
textures on it as well as protecting the emulsion layers from scratching and
abrasion. The earlier papers may have been handled differently with the
coatings encapsulating the only the paper substrata and not the emulsions or
on the top and bottom with no middle layer of resin coating.

With respect to inkjet papers, I would think that there may be a absorbent
layer between the substrata and a topmost layer which is also a type of
micropoureous layer, which serves to permit surface textures while allowing
the ink to be absorbed by the layer below and protected from being attacked
by air pollutants that might have a greater effect if the ink remained on
the surface or susceptible to running and dilution by moisture that might
come into contact with the inks if there weren't such protection. But the
topmost surface is not a sealant in the true sense of the word or else the
inks would not be able to penetrate it to get to the layer on which it
lives.

-----Original Message-----
From: owner-epson-inkjet@...
[mailto:owner-epson-inkjet@...]On Behalf Of Victor
Sent: Tuesday, June 12, 2001 10:08 AM
To: epson-inkjet@...
Subject: Re: Separating Prints from Glass


On Tue, 12 Jun 2001 10:42:57 +0200, you wrote:

> The resin coated photographic
>papers used polyethylene on the the front and back
>of the paper itself and the emulsion was then coated
>on the polyethylene again so no developer etc. entered the
>paper. Main problem was and is the adherence of the
>emulsion to the polyethylene.

Phil said, "I thought the (RC paper) resin coating was polyethylene." I
assumed
this meant the top layer was polyethylene. Now it sounds like you're saying
this
is actually a middle layer, with an emulsion layer on top. That may be true
for
photographic prints, but what about inkjet prints? Isn't it true that with
inkjet prints the layer that absorbs the ink is below some other layer? If
so,
what is the topmost layer made of? I thought that is what we were
discussing.
---------------------------
l i g h t s @ o n r . c o m
-
Turn off HTML mail features. Keep quoted material short. Use accurate
subject lines. http://www.leben.com/lists for list instructions.

-
Turn off HTML mail features. Keep quoted material short. Use accurate
subject lines. http://www.leben.com/lists for list instructions.