Improvements in Paper-machines.
Year: 1893

page_text: Date of Application, 5th Apr., 1893-Accepted, 6th May, 1893
COMPLETE SPECIFICATION.
Improvements in Paper-machines.
I, PETER JENSEN of 77 Chancery Lane London Chartered Patent Agent
do hereby declare the nature of this invention, (a communication to me from
abroad by Carl Eichhorn of Fockendorf near Treben, in Sachsen-Altenburg,
Germany, Manager of the Paper-manufactory at Fockendorf) and in what manner
the same is to be performed to be particularly described and ascertained in
and by the following statement :-
In paper machines of usual construction it has often been felt as an inconvenience
and trouble, that it was not feasible when using an endless wire-gauze band of a
given fineness and for a pulp of a given quality to produce more than one single
thickness of paper and this usually but at a low speed.
To work paper of greater thickness on such machines it was hitherto necessary to
use an endless band of coarser wire-gauze and in addition other devices, which bad
to be removed when it was required to make finer sorts of paper, causing thereby
expenses, labour and loss of time.
The improvement as described hereinafter has for its object the production of
papers of different thickness by means of an endless wire-gauze band of an average
constant fineness and the increasing of the speed of the machine so as to obtain a
considerably increased production even when making use of smeary pulps, which
heretofore could not be employed.
Moreover this invention, employing the new arrangements, in opposition to all
the existing ones, which are so complicated and not reliable in action, easily
overcomes the difficulty of manufacturing double papers and papers and card boards
of two colours, with the least possible expense and loss of time, when changing from
the manufacture of ordinary papers to the manufacture of the said other sorts
of paper.
In the accompanying drawing:
:-
Figure is a diagram showing the general arrangement of a paper-machine.
A are the couching-rolls, B is the front-roller, C are the guide-rollers of the endless
wire-gauze band; some of these guide-rollers are adjustable in the vertical direction
in order to give the endless band the proper tension; D' D2 D3 are well known
suction-apparatus; E is a levelling-roller being vertically adjustable and F is an
auxiliary levelling-roller also adjustable in the vertical direction; G is an ordinary
dandy-roll or wire-gauze drum, having flanges at the ends and held in position by
means of four bearing- and guide-rollers; H is a pulp-supply-box, which is only
used for double and double coloured papers.
Ordinary papers of suitable pulp and desired thickness may be manufactured as
usually; for this purpose the endless wire-gauze band is in position 1 shown by dotted
lines on the drawing, the roller E having been lowered and F withdrawn.
working conditions are then the same as for an ordinary paper-machine.
The
For manufacturing at a greater speed and for producing paper of greater
thickness, first the tension of the wire-gauze band is diminished by releasing the
adjustable guide-rollers C, then the levelling roller E is put in its upper position
and the auxiliary roller F is so placed that the wire-gauze band or belt supported
by the last two rollers ascends. A proper tension is then given to the wire-gauze
belt again by operating the adjustable guide-rollers C.
The dandy-roll G acts as a couching-roll so that a faultless and uncrushed paper
with first-rate transparency is delivered from the wire-gauze belt to the upper
couching-roll A, which in consequence of the elevated position of the roller E
touches the paper with a greater part of its cylindrical surface securing thereby a
much better couching effect. For manufacturing card boards and the like it is
preferable to lower a little the levelling-rollers E and F, for instance into the

page_text: position 2 shown by dotted lines, so as to prevent the formation of folds or the like
in the paper, passing around the upper couching roll.
For producing double layer-papers or double coloured papers the pulp-supply-
box H is to be fixed upon the frame of the dandy-roll so that the liquid pulp can
flow in a continuous current upon the dandy-roll, whereby water is drained off and
a reliable couching of the pulp forming the second layer of the paper is effected.
A delivery-gutter arranged inside the dandy-roll or wire-gauze drum and provided
with adjustable wings collects the water having passed through the walls of the
dandy-roll and delivers it at one end of this roll, securing thereby a quick drying
of the pulp or paper.
Figures 2 and 2B show also diagrams of a paper-machine wherein the principle
of the invention is employed twice.
According to Figure 2^, two dandy rolls G and G2 are arranged also two
auxiliary levelling rollers F and F. The pulp-supply-box H for paper with
double layers or for double coloured paper is always to be mounted above the
dandy roll G. The cleaning of the dandy-roll G' is best done by means of a soft
cleaning roller J with scraper K and pulp-gutter L.
According to Figure 2B, a second sieve-belt of wire-gauze is passing around the
second dandy-roll G. This upper sieve runs over a front roller B³, a levelling
roller N, register-rolls r, suction apparatus D, regulating roll R and tension
roller S and is moreover provided with pulp-supply-box H and adjustable skimmers
and size-laths.
This upper sieve however, does not surround the upper couching-roller as it has
been the case for upper sieves hitherto in use.
The advantages of this improved arrangement are evident. It allows a quicker
working and the producing of a thicker paper with an excellent appearance and
regularity in a higher degree than with the simple arrangement, because it affords
a double energetic couching and pressing out of the water upward and downward
as well as a favourable ascending motion of the endless wire gauze belt, caused
twice by means of the rollers F and F and E.
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
First. In a paper-machine the combination with the endless wire-gauze belt of
adjustable levelling rollers E and F placed in front of the couching rolls and
adapted to cause an ascending motion of the endless belt substantially as described.
Second. In a paper-machine the combination with the endless wire-gauze belt of
adjustable levelling rollers E and F placed in front of the couching rolls and
adapted to cause an ascending motion of the endless belt of a dandy-roll G
supported in roller-bearings and provided with a gutter having adjustable wings
and of a pulp-supply box H arranged above the dandy roll, substantially as and
for the purpose specified.
Third. In a paper-machine the combination with the endless wire-gauze belt of
adjustable levelling-rollers E, F and F2, of dandy-rolls G1, G2, of a pulp-supply-
box H and of a cleaning roller J with scraper K and pulp-gutter L, substantially
as set forth.
Fourth. In a paper-machine the combination with the endless wire-gauze belt of
adjustable levelling rollers E, F and F of dandy rolls G1, G2, of an endless upper
sieve passing round the dandy roll G2, and being guided and supported by suitable
guide- and tension-rollers, of a pulp supply-box H and of a cleaning roller J with
scraper K and pulp gutter L substantially as and for the purpose described.
Dated this 5th da
11002
JENSEN & SON,
77, Chancery Lane, London, W.C., Patent Agents.