Improvements in the Manufacture of Sensitized Paper suitable for Photographic Purposes.
Year: 1895

page_text: Date of Application, 20th Dec., 1895
Complete Specification Left, 19th Oct., 1896-Accepted, 19th Dec., 1896
PROVISIONAL DIEUITIVATION.
Improvements in the Manufacture of Sensitized Paper suitable for
Photographic Purposes.
I, WILLIAM FRIESE-GREENE of 39 King's Road, Chelsea in the County of
London, Photographer, do hereby declare the nature of this invention to be
as follows:-
Hitherto in the manufacture of sensitized paper it has been usual to take paper
of special make and to sensitize it by coating the surface with sensitizing materials.
such for example as solutions of silver, iron or platinum salts. This method of
sensitizing the paper is expensive and inconvenient inasmuch as it necessitates a
distinct operation.
Now according to my invention. I apply the sensitizing materials to the paper in
the course of its manufacture and preferably when in the state of pulp. The two
processes viz. the manufacture and the sensitizing of the paper are thus effected at
one and the same time instead of as heretofore at separate times. The parts of the
paper making and sensitizing machinery between the place where the sensitizing
materials are introduced and the place where the paper is wound on a drum or roll
should be enclosed and no light admitted except through red-covered or other non-
actinic openinge. And any parts of the machinery with which the pulp comes into
contact after the addition of the sensitizing materials should be made of substances.
which will not injuriously affect those materials.
When the sensitizing materials are introduced into the paper while this is in the
state of pulp I preferably add them just before the pulp is run upon the wire web.
or other "former," care being taken to thoroughly mix them with the pulp. If the
sensitizing materials are applied after the paper has "formed" and has become
more or less dry, they can be applied to the surface by a suitable spreader before-
the paper web reaches the winding up roll.
)
тргоѵошению 11 the manufacture of Sensitized Paper suitable for
Photographic Purposes.
I, WILLIAM FRIESE-GREENE of 39 King's Road, Chelsea in the County of
London, Photographer, do hereby declare the nature of this invention and in
what manner the same is to be performed, to be particularly described and
ascertained in and by the following statement :-
Hitherto in the manufacture of sensitized paper it has been usual to take paper
of special make and to sensitize it by coating the surface with sensitizing materials
ID_

page_text: such for example as solutions of silver, iron or platinum salts. This method of
sensitizing the paper is expensive and inconvenient inasmuch as it necessitates a
distinct operation.
Now according to my invention I apply the sensitizing materials to the paper in
the course of its manufacture. The two processes viz. :-the manufacture and the
sensitizing of the paper are thus effected at one and the same time instead of as
heretofore at separate times. The parts of the paper making and sensitizing
machinery between the place where the sensitizing materials are introduced and
the place where the finished paper is wound on a drum or roll should be enclosed
and no light admitted except through red covered or other non-actinic openings.
And any parts of the machinery with which the pulp or paper web comes into
contact after the addition of the sensitizing materials should be made of substances
which will not injuriously affect those materials.
The sensitizing materials may be introduced into the paper while this is in the
state of pulp and in this case I preferably add them just before the pulp is
run upon the wire web or other "former," care being taken to thoroughly mix them
with the pulp. I prefer however to apply the sensitizing materials after the paper
has "formed" and has become more or less dry or more correctly speaking when it
is still more or less moist. They can be applied to the surface by a suitable
spreader before the paper web reaches the winding up roll. This spreader may
conveniently be in the form of a rotating roller partly immersed in a trough
containing the sensitizing materials; the "formed" web is caused to travel over
the upper surface of this roller and is kept in contact therewith by an upper guide
roller so that the spreading roller as it rotates becomes coated with the sensitizing
materials and transfers them to or spreads them upon the paper. In order to
ensure more uniformity in the distribution one or more other rollers may be placed
between the above described spreading roller and the paper, like the inking rollers
of a printing machine.
If it be required to apply the sensitizing materials to both surfaces of a "formed"
and still more or less moist web it may first have them applied to one surface in the
manner above explained and then the web may be reversed so as to bring the other
surface to the bottom and this surface may then have the sensitizing materials
applied to it by a similar arrangement of rollers. Or when both sides of the
moist paper web are to have the sensitizing materials applied to them it may be
-caused to travel by means of guide rollers through the sensitizing materials in a
trough.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed, I declare that what I
claim is:-
1. The mode of manufacturing sensitized paper suitable for photographic
purposes which consists in applying the sensitizing materials to paper in the course
of its manufacture from the pulp into the dry web substantially as herein before
described whereby the two processes of manufacturing the paper and sensitizing it
-are effected at one and the same time.
2. The addition of sensitizing materials to paper pulp preparatory to the pulp
being run upon the wire web or other "former” substantially as and for the
purpose herein before described.
"
3. The application of sensitizing materials to a paper web after it has "formed
but when it is still moist, substantially as and for the purpose hereinbefore
-described.
J. C. MEWBURN & ELLIS,
55 and 56 Chancery Lane, London, Chartered Patent Agents.