Improvements in and relating to Paper Marking Rollers.
Year: 1894

page_text: Date of Application, 16th July, 1894-Accepted, 18th Aug., 1894
Improvements in and relating to Paper Marking Rollers.
I, ROBERT BROWN of No. 5 Valleyfield Road, Penicuick, in the County of
Midlothian, North Britain, Paper Maker, do hereby declare the nature of this
to be performed, to be particularly
vention and in what manner the same
escribed and ascertained in and by the following statement:-
This invention relates to those rollers of paper making machines which produce
he longitudinal and transverse lines and water or other marks upon the paper, and
as for its objects ;-
it in the marks made by the said rollers upon the
vention and in what manner the
escribed and ascertained in and by the following statement :-
This invention relates to those rollers of paper making machines which produce
he longitudinal and transverse lines and water or other marks upon the paper, and
as for its objects ;-
1st To obtain greater uniformity in the marka made by the said rollers upon the
paper;
2nd To prevent the rollers becoming choked with the pulp;
3rd To diminish the time required for cleaning the said rollers from pulp;
4th To prevent waste of paper pulp;
5th To prevent the fibre of the pulp from being disintegrated ;
6th To keep the colour equal on each side of the paper;
7th To enable the webb of paper to be cut up to better advantage;
8th To enable the machine to be driven at a greater speed than has been possible
hitherto;
9th To increase the strength and durability of such rollers.
The rollers which are in common use for making the said marks upon paper
during its manufacture are technically called "dandy rolls" and consist of a
skeleton roller frame covered with wirework which is fitted upon the said frame.
Whereas the ordinary "dandy roll" has only one wire cover this improved roller
66 wove cover
has two. A foundation sheet of wire gauze, technically called a
is in this invention first fitted upon the skeleton frame.
"
"
For a "laid-line" roller this gauze foundation is made with a wider mesh than
the ordinary "wove cover. A single wire is next fitted spirally around the roll
from one end of it to the other and fastened thereon for the purpose of producing.
what is called "laid-lines." The pitch of this spiral is (in each coil) equal
to two at least of the underlying meshes of wove cover which form a groove
or bed for the spiral wire to repose in and thus keep it firmly in the desired
position.
"
The said "wove cover is made close or open in its meshes to adapt it for
producing the required number of threads to the inch of the "laid-line" wire which
is fitted upon it as just described.
"
"
upon the
Upon the top of this spiral coil for producing the "laid-lines
paper the "line-mark wires are fitted transversley thereto from end to end of
the roller so as to produce these straight lines across the webb of the paper;
the "laid-lines" produced by the spiral coil run the lengthway of the webb and not
across it.
"
By this method of arranging upon the rollers the wires which produce the "laid "
and "line-marks upon the paper, (which method is the exact opposite of that
ordinarily adopted), the webb of paper can be cut up into sheets with less waste
than has been possible hitherto.
This double cover upon the skeleton frame has the effect when in use, because of
the closeness of its perforations, of preventing the liquid pulp working through
the cover into the interior of the roll thus preventing waste of pulp and the
time often consumed in cleaning it out of the roll; it also enables the machine

page_text: to be driven at a greater speed than ordinarily found. possible as it presses
down the pulp and does not lift it up by its imprisonment in the meshes, or
I sintegrate it.
The density of these double covers serves also to keep more of the water upon
the face of the pulp and prevents its fibre from being opened up so much as it is
with the ordinary single covered roller.
water
It has been found in working out this invention that the closeness of the
perforations in this double cover for "laid dandy" rolls produces a more distinct
and "line-mark," also a greater equality in the "laid "lines and of the
colour upon each side of the paper, owing to the greater compression of the pulp
by means of this densely perforated and rigidly firm wire covering.
It compresses the colour and pulp upon the outer surfaces of the sheet: the
pulp cannot readily penetrate through the minute perforations of this double
cover.
"
"
The covers of marking or "dandy" rolls for producing "wove" papers are, in
accordance with this invention, also made with two coverings of wire gauze for the
aforesaid purposes instead of one cover only. One of these " Wove covers is fixed
upon the other and both are united to the skeleton frame. This double "wove
cover is stronger and more durable than a single one, it prevents the disintegration
of the pulp or its imprisonment in the meshes, it makes the colouring more dense
upon the outer surfaces of the paper, marks the paper more regularly because of
its unyielding rigidity and enables the machine to be driven at a greater speed than
can be effected when using a single cover for the roller.
This arrangement of wires and wire covers for producing "laid-line" and other
marks upon paper is designed for application to rolls at present in use as well as to
newly constructed ones.
The duplication of the cover, two instead of one upon each roller increases its
strength and durability.
My invention will be better understood if reference is made to the accompanying
drawings in which :-
Figure 1 is a fragmentary, longitudinal view of a "dandy roll" constructed
according to my invention; the extremities only of the roll are shewn for
convenience of illustration.
Figure 2 is an end view of the same roll.
The parts marked A represent the frame of the "dandy roll" constructed in any
ordinary manner, B is the "wove" cover, C the spirally coiled wire for producing
the "laid" line and D the transverse wires for producing the "line-marks
before described.
37
as
I am aware that paper marking rollers have been made prior to my invention
which have been covered with wire gauze for producing "wove" marks, also that
"laid" lines and other "line-marks" and what are commonly called "water
marks" have been produced by wire covers put upon the skeleton frames of "dandy
rolls, it will therefore be understood that I do not claim these things broadly as my
invention.
"
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 :-
1st. In a paper making machine the combination therewith of a paper marking
roller having a double wire cover all substantially as herein described and drawn
or any mere modification thereof for the purposes specified.
"
2nd. In the marking roller of a paper making machine the combination there-
with of a "wove" or gauze wire foundation cover and a superincumbent "laid
wire cover fitted thereon all substantially as herein described and drawn or any
mere modification thereof for the purposes specified.
3rd. In the marking or 66
dandy "roll of a paper making machine, the com-
bination therewith of a foundation cover of wire gauze B, a spiral coiled wire C

page_text: fitted upon the gauze B and the transverse wires D fitted upou the spiral wire C
all substantially as herein described and drawn for the purposes specified.
4th. In a paper making machine the general arrangement and combination
of parts constituting the improved marking or "dandy" roll, shewn in the annexed
drawings and substantially as herein described for the purposes specified.
Dated this Tenth day of July 1894.
JOSEPH
LOCKWOOD,
263, Argyle Street, Glasgow, Agent for the Applicant.