A
Arthur Entlich
Kodak has changed their paper technology many times over the last few
years. I have at least three types here, and Ron Baird, from Kodak can
probably tell you which types are swellable polymer versus microporous.
In general, swellable polymer technology is not waterproof. The ink
will soak off the surface with a bit of hot water, because the polymer
remains water soluble.
To give you a bit more detail:
Microporous paper surfaces usually have a ceramic or plastic surface
which has microscopic holes which allow the ink to pass through. The
surface under it is usually a clay coating called kaolin which is the
same material in white porcelain and a mordant which is designed to lock
the ink into place in this material. Once the ink is dry, it tends to be
set in the lower layer, and the ink remains relatively waterproof.
However, since the surface if full of holes, energized ink molecules
(from UV light, or other chemical sources) can escape through those
holes, and do (thus the ink colors fade).
Swellable polymer is a coating of complex long chain tangled molecules.
Gelatin, egg white, and some soluble synthetic chemicals all are these
types of materials. When the ink hits these materials the liquid makes
the polymer swell which opens up some of the tangles and makes space,
where the ink colors fits. Then, the coating dries, and locks the
colorant into these tangled molecules, sealing them in.
The only major problem with this method is that the paper is slower
drying and may be vulnerable to damage when it leaves the printer.
Even when dry, the surface tends to be softer and more easily damaged
mechanically , and finally, it remains water soluble, so dampness and
fingerprints may damage it, and the ink may wash out of wet.
In general, you can determine a swellable polymer paper by wetting some
that is printed (it will ruin the print, so use scrap or a failed image)
and see if the surface becomes sticky, or even washes off in the water
the ink begins to run. You may be able to tell by wetting a finger and
touching a corner of a non-print area and see if it gets quite sticky.
If so, it is probably swellable polymer.
Art
years. I have at least three types here, and Ron Baird, from Kodak can
probably tell you which types are swellable polymer versus microporous.
In general, swellable polymer technology is not waterproof. The ink
will soak off the surface with a bit of hot water, because the polymer
remains water soluble.
To give you a bit more detail:
Microporous paper surfaces usually have a ceramic or plastic surface
which has microscopic holes which allow the ink to pass through. The
surface under it is usually a clay coating called kaolin which is the
same material in white porcelain and a mordant which is designed to lock
the ink into place in this material. Once the ink is dry, it tends to be
set in the lower layer, and the ink remains relatively waterproof.
However, since the surface if full of holes, energized ink molecules
(from UV light, or other chemical sources) can escape through those
holes, and do (thus the ink colors fade).
Swellable polymer is a coating of complex long chain tangled molecules.
Gelatin, egg white, and some soluble synthetic chemicals all are these
types of materials. When the ink hits these materials the liquid makes
the polymer swell which opens up some of the tangles and makes space,
where the ink colors fits. Then, the coating dries, and locks the
colorant into these tangled molecules, sealing them in.
The only major problem with this method is that the paper is slower
drying and may be vulnerable to damage when it leaves the printer.
Even when dry, the surface tends to be softer and more easily damaged
mechanically , and finally, it remains water soluble, so dampness and
fingerprints may damage it, and the ink may wash out of wet.
In general, you can determine a swellable polymer paper by wetting some
that is printed (it will ruin the print, so use scrap or a failed image)
and see if the surface becomes sticky, or even washes off in the water
the ink begins to run. You may be able to tell by wetting a finger and
touching a corner of a non-print area and see if it gets quite sticky.
If so, it is probably swellable polymer.
Art