Year: 1898

page_text: Date of Application, 15th Jan., 1898
Complete Specification Left, 14th Nov., 1893-Accepted, 17th Dec., 1898
I, CHARLES DUDLEY MARSHALL, of the Firm of T. J. Marshall & Co., of
Campbell Works, Stoke Newington, in the County of London, Paper Makers'
Engineers and Dandy Roll Makers, do hereby declare the nature of this inven
tion to be as follows:-
My invention relates to dandy rolls and comprises the improvements hereinafter
set forth.
In dandy rolls as at present constructed the outer covering, as well as the backing
or body and other metallic portions thereof, are liable to corrosion from the
presence of acid or similar substances in the pulp under treatment or from the
necessary use of such acid or other strong solution when cleansing the roll.
One object of my said invention is to prevent this corrosion and thus to render
the life of the rolls longer than heretofore. My said invention also comprises an
improved method of securing together without soldering, or in combination with
such means, the various parts of which the said rolls are built up, and of fixing
to the wire-gauze, or other outer coverings of the said rolls, the requisite metal
device intended to form the water-mark on the paper.
As is well known, as at present constructed, dandy rolls consist mainly of an
outer cylindrical covering of wire, wire gauze or longitudinally or helically laid
wires forming wove, laid, or spiral laid rolls; a foundation body or backing to
support the same; and an inner or central spindle or other means by which the
said outer covering and foundation is sufficiently supported. The foundation,
body, or backing is formed of a number of helically wound or crossed wires, some
or all of the junctions or crossing places of the said wires being secured by
soldering, sewing or the like.
According to my said invention I subject the above mentioned foundation, body,
or backing to an electro-deposition of some suitable non-corrosive metal, such as
copper, nickel, brass, silver or other suitable metal which will render the wire,
or metal rods, or tubes of which the said roll is built up, proof against the action
of the acid, or practically so. I may subject the foundation, body, or backing to
this electro-deposition of non-corrosive metal either after it has been built up, and
the parts fixed together by soldering, or before such soldering has been effected,
in which latter case the component parts may first be temporarily secured together
in any convenient manner, and the electro-deposition may in that case likewise
form the means for securing the wires or their equivalents one to another and
enabling soldering or sewing to be dispensed with.
For the purpose of preventing or mitigating corrosion or damage I may like-
wise form a similar electro-deposition of some suitable non-corrosive metal upon
the wire gauze or other substance forming the outer covering of the dandy roll.
This electro-deposition is effected either before or after the said outer covering is
placed in position upon the roll, and in the latter case the said electro-deposition

page_text: will serve to secure the said covering in position, and in some instances, moreover,
I dispense with the wire stitching by means of which the abutting or adjacent
edges of the said covering are secured together, so as to form the necessary cylin-
drical outer covering, and I form such attachment by means of the said
electro-deposition, the edges of the cover being temporarily secured together in
any suitable manner.
When it is desired to affix to the outer covering a suitable device to form a
water mark on the paper, the said device or lettering is likewise placed in position,
and temporarily secured by a non-metallic cord or otherwise, before the electro-
deposition of non-corrosive metal is effected, and is thus permanently fixed to the
said cover by the said electro-deposition.
To allow for the decrease in the size of the meshes or interstices of the cover
that will be caused by the above mentioned electro-deposition of non-corrosive
metal, I employ wire-gauze of a mesh coarser in proportion to the thickness of
the coat of metal that is to be so deposited thereon or in the case of laid rolls the
parallel wires forming the cover are placed somewhat farther apart than they
would otherwise have been or are formed of thinner wire.
Doted the 11 1
1000
Improvements relating to Dandy Rolls.
I, CHARLES DUDLEY MARSILALL, of the Firm of T. J. Marshall & Co., of
Campbell Works, Stoke Newington, in the County of London, Paper Makers'
Engineers and Dandy Roll Makers, do hereby declare the nature of this inven-
tion and in what manner the same is to be performed, to be particularly described
and ascertained in and by the following statement:-
My invention relates to dandy rolls and comprises the improvements hereinafter
set forth.
In dandy rolls as at present constructed the outer covering, as well as the backing
or body and other metallic portions thereof, are liable to corrosion from the
presence of acid or similar substances in the pulp under treatment or from the
necessary use of such acid or other strong chemical solution when cleansing the roll.
One object of my said invention is to prevent this corrosion of the component
parts and thus to render the life of the rolls longer than heretofore. My said
invention also comprises an improved method of securing together without solder-
ing, or in combination with such means, the component parts of which the said
rolls are built up, and of fixing to the wire-gauze, or other outer coverings of the
said rolls, the requisite metal devices intended to form the watermark on the paper.
In the accompanying drawings, which illustrate my invention,
Figure 1 is an elevation of part of a dandy roll, the various layers of its com-
ponent parts being stripped off at different points so as to more clearly show its
construction, and those parts lying behind being omitted to prevent confusion.
Figure 2 is a transverse section on the line -, Figure 1, and
Figure 3 is an elevation of part of a dandy roll having a different outer covering
and showing part of the water-marking device in position thereon.
As is well known, dandy rolls, as at present constructed, consist mainly of an
outer cylindrical covering of wire gauze, as shown at h in Figure 1, or helically
laid wires, or longitudinally laid wires as shown in Figure 3 forming wove, spiral

page_text: laid, or laid rolls; a foundation body or backing to support the same as illustrated
by the parts a, b, c, and d in Figure 1; and in some cases an inner or central
spindle or other means (not shown in the drawings) by which the said outer cover-
ing and foundation is supported if it is not otherwise of sufficient strength.
The drawings depict one form of dandy roll which is built up (on a mandrel
which is not shown) of longitudinal members a. Around these is wound one or
more helices b upon which are placed a second layer of longitudinal members c
and which are in turn surrounded by one or more helices d wound in the opposite
direction. These parts are usually united to each other at every point of contact
and constitute the foundation body or backing of the roll. The roll after the
removal of the mandrel, is mounted upon end plates e provided with shoulders f
and gudgeons or journals and to which end plates the body is secured. Upon
this support the outer covering his secured, and such outer covering in turn has
secured to it the water-marking device i.
According to my said invention I subject the above mentioned foundation, body,
or backing to an electro-deposition or submit it to a bath of some suitable non-
corrosive metal, such as copper, nickel, brass, silver, or other suitable metal which
will render the wire, or metal rods, or tubes of which the said roll is built up,
proof against the action of the acid or chemicals used, or practically so.
I may
subject the foundation, body, or backing to this electro-deposition or like deposit
of non-corrosive metal either after it has been built up and the parts fixed together
by soldering and the parts removed from the mandrel or before such soldering has
been effected, in which latter case the component parts may first be temporarily
secured together in any convenient manner such for example as by non-metallic
cords or threads or by non-metallic gauge rings or clamps, and the clectro-deposi-
tion or like deposit may in that case likewise form the means for securing the
wires or their equivalents one to another and enabling soldering or sewing to be
entirely or partially dispensed with.
For the purpose of preventing or mitigating corrosion or damage I may like-
wise form a similar electro-deposition or like deposit of some suitable non-corrosive
metal upon the wire gauze or other substance forming the outer covering of the
dandy roll. This electro-deposition or like deposit is effected either before or
after the said outer covering is placed in position upon the roll and in the latter
case the said deposition will serve to secure the said covering in position, and in
some instances, moreover, I dispense with the wire stitching by means of which
the abutting or adjacent edges of the said covering are secured together, so as to
form the necessary cylindrical outer covering, and I form such attachment by
means of the said deposition, the edges of the cover being temporarily secured
together in any suitable manner.
When it is desired to affix to the outer covering a water-marking device, such
device is likewise placed in position, and temporarily secured by a non-metallic
cord or otherwise, before the deposition of non-corrosive metal if effected, and is
thus permanently fixed to the said cover by the said deposition.
To allow for the decrease in the size of the meshes or interstices of the cover that
will be caused by the above mentioned deposition of non-corrosive metal, I employ
wire-gauze of a mesh coarser and finer wire in proportion to the thickness of the
coat of metal that is to be so deposited thereon or in the case of laid rolls the
parallel wires forming the cover are placed somewhat farther apart than they
would otherwise have been or are formed of thinner wire.
Instead of depending solely upon the metallic deposition, the parts may in some
cases be united in addition at some or all of the points of junction by soldering in
the usual manner and the metallic deposition will in that case increase the
durability of the soldered junctions.
It will be obvious that each set of members, or the roll in its several stages of
building up, may be subjected to the said metallic deposition, that is to say by
more than one operation, or alternatively one such operation may serve for covering
and uniting the whole of such parts to each other.

page_text: Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed, I declare that what I
claim is
-
1. In the manufacture of a dandy roll, coating some or all of the component
parts with a deposit of non-corrosive metal substantially as set forth.
2. In the manufacture of a dandy roll, coating some or all of the component
parts with a deposit of non-corrosive metal serving as a protective medium against
the acids or other chemicals with which such rolls come into contact.
3. In the manufacture of a dandy roll, coating some or all of the component
parts with a deposit of non-corrosive metal serving as a means for uniting the
joints or increasing their durability.
4. In the manufacture of a dandy roll, coating some or all of the component
parts with a deposit of non-corrosive metal serving as a protective medium against
the acids or other chemicals with which such rolls come into contact, and as a
means for uniting the joints or increasing their durability.
5. In the manufacture of a dandy roll, coating some or all of the component
parts with a deposit of non-corrosive metal whilst such component parts are held
together by non-metallic threads or their equivalents substantially as set forth.
6. The dandy roll constructed substantially as described and illustrated in the
accompanying drawings.