Improvements in and relating to Paper-making Machines..
Year: 1898

page_text: PROVISIONAL SPECIFICATION.
Improvements in and relating to Paper-making Machines..
I, BENNO SCHOELLER, of 70, Oberstrasse, Düren, Rheinland, in the German
Empire, Paper Manufacturer, do hereby declare the nature of this invention
to be as follows:-
The press-rolls heretofore generally employed in paper-making machines with
endless or long sieves or strainers of wire-cloth, felt and the like, do not permit
of working with high pressures on account of the strong adhesion of the said rolls
to the moist paper-material. Therefore only such material can be worked, the
adhesion of which to the press rolls is not so great.
In order to prevent a strong clinging or adhesion of the material to the press-
rolls, and to permit of the presses to be worked at a higher pressure and thus
better removing the water and working material which could not otherwise be so
worked on account of the strong adhesion to the presses during the passage
through them, the upper press-rolls are made of a crystalline kind of stone (such
as granite,. porphyry, syenite etc.) or of kinds of stone which are composed of
parts of varying hardness, such for example, as sandstone.
In carrying my said invention into practice, I preferably proceed as follows:-
The upper press-roll of the first press, beneath which passes the pressing felt, is
made of a crystalline kind of stone (granite, porphyry, syenite, etc.) or of kinds of
stone which are composed of parts of varying hardness, such for example, as
sandstone.
From such kinds of stone the remaining rollers of the paper-making machine
can be made.
The advantages of employing such kinds of stone for these press-rolls are as
follows: Small adhesion of the material to these rollers compared with the
rollers heretofore employed; capability of the presses being worked under a
higher pressure, and thus better removing the water from and working material
which otherwise, on account of its strong adhesion to the upper press-roller, would
not be adapted, to pass through the presses."
Moreover no bending of the press-rolls takes place at high pressure, since the
kinds, or varieties of stone employed are not elastic.
1*
D: YOUNG & Co.,
11 and 12, Southampton Buildings, London, W.C.,
Agents for the Applicant.

page_text: I, BENNO SCHOELLER, of 70, Oberstrasse, Düren, Rheinland, in the German
Empire, Paper Manufacturer, 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:-
With the upper press-rolls heretofore generally employed in Fourdrinier and
like paper-making machines with endless bands of wire-cloth, felt and the
like, the strong adhesion of the moist paper-material to these rolls involves many
disadvantages, to obviate which has been the aim of the paper-maker for a long
time.
Thus, for example, the press-roll which serves for removing the water from the
material on the sieve or wire of the machine, the so-called couch-roll, must in
most cases, be provided with a seamless felt or woollen jacket in order to permit
working therewith. In the remaining press-rolls, the pressure must be regulated
in accordance with the adhesion of the material, that is to say, the pressure must
remain below that at which adhesion takes place and thus only low pressures can
be employed which do not permit the moisture to be efficiently removed. For
this reason, the treatment of materials which adhere strongly to the press rolls
involves great difficulties, and under some circumstances is even impossible.
My invention obviates all these disadvantages and renders the felt or woollen
jacket on the couch-rolls unnecessary so that they can be provided with the same
kind of scraping-devices i.c. doctors," as the other press-rolls, and permits, even
with strongly adhesive materials, the employment of a high pressure for all the
wet presses.
According to my said invention, I make the upper press-rolls of Fourdrinier
and like paper-making-machines, including the couch-roll, of a crystalline kind
of stone (granite, porphyry, syenite) or of kinds of stone which are composed of
parts of varying hardness, for example, sandstone, or of artificial stones, the
compositions of which are of a like character to the before named kinds of
stone.
The drawing shows diagramatically a part of a Fourdrinier or like paper-making
machine with endless or long sieves or wires in which an upper press-roll of this
kind is shown as an example.
The upper press roll K, under which the pressing felt or sieve P of the
machine passes, is made of one of the above-mentioned kinds of natural or
artificial stone and is provided with a doctor $ for removing the material.
The advantages afforded by employing press-rolls of this kind are:-Less
adhesion of the material to these rolls as compared with the rolls heretofore
employed; capability of working the presses under a high pressure, and of thus
better removing the water from and working material which otherwise, on account
of its strong adhesion to the upper press-roll, would not be adapted to pass through
the presses, also the practicability of dispensing with the coating or jacket of felt
or the like on the couch-rolls, that is to say, these rolls can run bare and be
provided with "doctors."
Moreover there is no yielding or bending of the press-rolls at a high pressure,
since the stones are rigid.
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:
In paper-making machines with endless or long sieves of wire-cloth, felt and the

page_text: like, press-rolls composed of crystalline stone (such as granite, porphyry, syenite)
or of stone composed of parts of different degrees of hardness (for example,
sandstone) or of artificial stone the composition of which is of a similar character,
for the purpose of reducing the adhesion of the paper material and enabling
higher pressure to be used.
day of July 1.
D. YOUNG & Co.,
11 and 12, Southampton Buildings, London, W.C.,
Agents for the Applicant.