Improvements in or relating to Paper-making Machines.
Year: 1895

page_text: Date of Application, 21st May, 1895
Complete Specification Left, 18th Feb., .1896-Accepted, 11th Apr., 189€
PROVISIONAL SPECIFICATION.
Improvements in or relating to Paper-making Machines.
I, CARL LUDWIG KURTZ, of Reutlingen, Empire of Germany, Manufacturer
of Metallic Cloth, do hereby declare the nature of this invention to be as
follows:-
The first-pressure rollers for paper-making-machines are intended to offer a solid
support, for the fine sieve-covering, which, besides great lightness and the utmost
possible sectional area, will also be completely able to resist deformation.
a
The customary form of the drainers is, at present, to have a stout woven wire
cover secured outside a cylindrical skeleton framing formed of longitudinal bars,
with wires laid on edge helically round the bars forming the carcase and soldered
thereto in grooves cut for the purpose. The preparation of the bars for the frame-
work, as well as the application and soldering of the wire-helices thereto requires
great expenditure of time, for which reason the cylinders, when thus manufactured,
are extremely costly; while another and different mode of construction, in which
the soldering of round wires on the smooth inner sides of the bars dispenses with
the cutting of the grooves in their outer-sides, leaves much to be desired in point
of security and strength, seeing that, after a little use, the wire helices break away
at the parts where they are soldered.
According to this invention, the draining cylinder is manufactured in quite
another fashion, the result being the attainment of an exceptionally strong and
above all a practically indestructible first-pressure roller.
In the first place, a cylindrical sheet-metal cover of the diameter of the roller, is
applied to a skeleton sieve-cylinder. To this end the spaces intervening between
the ribs are cut out to a certain depth in circular rings or, better still, in a helical
line, while if desired the ribs, through the form of the shaper or tool employed are
at the same time bevelled or rounded off at the outer edges.
The width of the grooves to be cut i.e., the distance between the ribs is at the
same time determined according to requirement.
After the cylinder has, in this manner, been furrowed over its entire length, the
complete penetration of the cylinder follows, by means of a new shaping-machine
with a deeper cutter, between small ridges or fillets with their upper surfaces
slightly depressed below the general surface-level of the cylinder, and which, in
the finished cylinder constitute the cross-connections or supports of the said ribs.
These ridges or fillets may extend through the entire length of the first-pressure
roller, straight and perpendicular to the ribs, or they may be directed in helical
lines or shifted a step forward for which purpose it is only necessary to suitably
operate the tool which cuts the opening between each pair of cross-supports or
fillets.
In the result, I obtain a first-pressure roller, which has no projecting inward
parts and consequently may be easily cleaned by a water-jet; and which, further,
owing to its being formed all in one piere, constitutes a skeleton frame, externally,
perfectly smooth and extremely strong, which, on that account, is far more easily
constructed, with relation to weight of material than any cylinders built-up of
various parts.
The mode of construction hereinbefore described is also easily applicable to the
manufacture of ribbed drainers, inasmuch as with a correspondingly narrowed

page_text: position of the ribs longitudinally upon the same only the wires forming the ribbed
marks in the paper need be directly soldered thereto.
Dated this 21st day of May 1895.
BOULT & WADE,
Agents for the Applicant.
Improvements in or relating to Paper-making Machines.
I, CARL LUDWIG KURTZ of Reutlingen, in the Empire of Germany,
Manufacturer of Metallic Cloth, 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 :-
The dandy-roll body for paper-making-machines is intended to offer a solid
support, for the fine sieve-covering, which support as well as being very light and
possessing the utmost possible free cross sectional area or passage-way should also
be well able to resist deformation.
The customary form of the rolls is, at present, a stout woven wire cover secured
outside a cylindrical skeleton framing formed of longitudinal-bars, with wires laid
on edge helically round the bars to form the body or carcase and soldered thereto
in grooves cut for the purpose. The preparation of the bars for the framework, as
well as the application and soldering of the wire-helices thereto requires a great
expenditure of time, for which reason the cylinders, when thus manufactured, are
extremely costly; while another and different mode of construction, in which the
soldering of round wires on the smooth bars dispenses with the cutting of the
grooves in them leaves much to be desired in point of security and strength, seeing
that, after a little use, the wire helices break away at the parts where they are
soldered.
According to this invention the rolls are manufactured in quite another fashion,
the result being the attainment of an exceptionally strong and above all a
practically indestructible roll.
In the accompanying drawings,
Figs. 1, 2 and 3 are elevations of portions of rolls constructed according to this
invention, and
Fig. 4 is a section of a portion of an improved roll, transverse to the axis
thereof.
In the first place, a sheet-metal cylinder of the diameter of the roll is converted
by cutting into a skeleton sieve. To this end in the full metallic sheet there are
cut to a certain depth grooves in circular rings or, better still, in a helical line
leaving ribs a, while if desired, the ribs, through the form of the cutter employed,
are at the same time bevelled or rounded off at the outer edges, as shown in the
bottom part of Fig. 1, which is in section.
The width of the grooves to be cut, and the form and dimensions of the ribs
between them are determined according to requirement.
After the roll has, in this manner, been furrowed over its entire length, the
complete penetration of the cylinder web between the ribs follows, by means of
another cutting-machine with a cutter, leaving untouched narrow webs c which lie
below the outermost surface of the cylinder (see Fig. 4), and which, in the finished
roll, constitute the cross-connections of it.
These webs c may, extend through the entire length of the dandy-roll, straight
and perpendicular to the ribs a as in Fig. or they may be directed at angle or in
helical lines (as in Fig. 2) or shifted relatively to each other as in Fig. 3, for which
purpose it is only necessary to suitably operate the tool which cuts the opening
between each pair of the webs.

page_text: In the result, I obtain a dandy-roll, which has no projecting inward parts and
consequently may be easily cleaned by a water-jet; and which, further, owing to
its being formed all in one piece, constitutes a skeleton frame, externally, perfectly
smooth and extremely strong, which, on that account is far more easily constructed,
with relation to weight of material, than any cylinders built up of various parts.
The mode of construction herein before described is easily applicable to the
manufacture of ribbed rolls inasmuch as with a correspondingly narrowed position
of the ribs a longitudinally upon the same, only the wires forming the ribbed marks
in the paper need be directly soldered thereto."
Having now particularly described and ascertained the nature of the said inven-
tion, and in what manner the same is to be performed, I declare that what I
claim is ;-
1. Dandy-rolls and other rolls for paper-machines or the frame of such rolls
formed by first cutting out to a certain depth the material in circles or in a helical
line leaving the ribs a and then cutting through the remainder of the material
between the ribs leaving untouched either in straight lines, or shifted in position
relatively to each other the cross-webs c between the ribs as shown in Figures 1 2
and 3 thus forming a connection between the several parts of the roll or frame
substantially as described.
2. The formation of ribbed-rolls by soldering wires directly upon the encircling
ribs a of such a roll or frame as is claimed in Claim 1.
Dated this 18th day of February 1896.
BOULT & WADE,
Agents for the Applicant.