Improvements in the Manufacture and Production of Sheets, or Boards, for use in Copying Letters and the like in Copying Presses
Year: 1897

page_text: Date of Application, 21st Sept., 1897
Complete Specification Left, 29th Sept., 1897-Accepted, 20th Nov., 1897
PROVISIONAL SPECIFICATION.
Improvements in the Manufacture and Production of Sheets, or
Boards, for use in Copying Letters and the like in Copying
Presses
I GILBERT JOHNSON WILDRIDGE, of Moffat Paper Mills, Airdrie, North Britain,
Paper Maker, do hereby declare the nature of this Invention to be as follows:
_
This invention has for its object to make copying sheets, or boards, which are
economical in cost, efficient in use, and by the use of which impressions from
letters, or the like, can be taken in the copying press without the ink, which may
pass through the copying paper and be received on the said sheets, or boards,
formin, a readable impression of the letter, or the like, which has been copied.
According to this Invention the paper making materials are boiled and steamed,
so that they become softened, the steaming being preferably effected by injecting
steam upwards through the materials. The materials are divided, or cut, in such a
manner that the fibres are left long, and they are acted upon by a beater, and
formed into a pulp. The product is to be of a colour resembling the colour of
ordinary writing ink, or such as ordinary writing ink will not form a readable.
mark upon. This is best effected by making the pulp from black rags as then the
colour is fast. It can be done by adding colour to the pulp but then the colour is
apt to wash out when the sheets or boards are wetted. The pulp thus treated is
then put into a vat in which revolves a wire-work drum, and a vacuum is created
by withdrawing air from the drum, which causes pulp from the vat to adhere to
the drum, either in a layer of the requisite thickness, or of only a part of the
thickness of the sheets, or boards, required. In the latter case several layers
formed as described are pressed together, the several layers being preferably made
from separate vats with drums as described, the pulp being caused to flow into the
several vats and being removed from the drums on bands, so that the fibres of the
several layers are crossed relatively to each other.
Dated this 21st day of September 1897
JOHNSONS & WILLCOX,
47 Lincoln's Inn Fields, London, W.C., Agents.
Improvements in the Manufacture and Production of Sheets, or
Boards, for use in Copying Letters and the like in Copying
Presses.
I, GILBERT JOHNSON WILDRIDGE of Caldercruix Paper Mills, Caldercruix and of
Moffat Paper Mills, Airdrie, both in North Britain, Paper Maker, do hereby

page_text: 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:-
This Invention has for its object to make copying sheets, or boards, which are
economical in' cost, efficient in use, and by the use of which impressions from letters
or the like, can be taken in the copying press, without the ink, which may pass
through the copying paper and be received on the said sheets, or boards, forming
a readable impression of the letter, or the like, which has been copied.
According to this Invention the paper making materials are boiled and steamed,
so that they become softened, the steaming being preferably effected by injecting
steam upwards through the materials. The materials are divided or cut, in such
a manner that the fibres are left long, and they are acted upon by a beater and
formed into a pulp. The product is to be of a colour resembling the colour of
ordinary writing ink, or such as ordinary writing ink will not form a readable
mark upon. This is best effected by making the pulp from black rags as then the
colour is fast. It can be done by adding colour to the pulp but then the colour
is difficult to fix and if not properly fixed it is apt to wash out when the sheets or
boards, are wetted. The pulp thus treated is then put into a vat in which revolves a
wire work drum, and a vacuum is created by withdrawing air from the drum,
which causes pulp from the vat to
adhere to the drum either in a
layer of the requisite thickness, or of only a part of the thickness of the
sheets, or boards, required. In the latter case several layers formed as described
are pressed together, the several layers being preferably made from separate
vats with drums as described, the pulp being caused to flow into the several vats
and being removed from the drums on bands, so that the fibres of the several
layers are crossed relatively to each other.
Having now particularly described and ascertained the nature of this Invention
and in what manner the same is to be performed I declare that what I claim
is:-
1. The manufacture and production of copying sheets or boards from paper
making materials so that the produced copying sheets or boards are of such colour
as will not take a readable impression of the letters or the like copied.
2. The manufacture of copying sheets or boards in the manner herein before
described.
.
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