Improvements in or relating to the Manufacture of Paper.
Year: 1898

page_text: Date of Application, 2nd Apr., 1898
Complete Specification Loft 31st Aug 1808 Accented 15th not
1808
PROVISIONAL SPECIFICATION.
Improvements in or relating to the Manufacture of Paper.
I, WALTER KNOWLES TROTMAN, of 76, Foulden Road, Stoke Newington, in
the County of Middlesex, Engineer, do hereby declare the nature of this inven-
tion to be as follows:-
-
This invention relates to the manufacture of paper and has for its object
to cause both sides of the paper to have the same surface, the underside being
softened, with water size gum or the like to enable the wire marks to be taken
out by the pressure of the calender rolls.
According to this invention the paper may be treated on its upper surface
in the ordinary manner, but to enable the under surface to be similarly treated
I cause the paper to pass over or above a specially arranged and constructed
dandy-roll. This dandy-roll comprises a rotatable cylinder of wire gauze or
similar material, having a tube running axially through it, and partially im-
mersed in a trough containing water, size, gum, or other substances in solution,
with which the paper is to be treated. A series of jets projecting from the upper
side of the axial tube enables steam or air to be driven through the wire cylinder
so as to transfer the liquid, retained in the meshes of the wire, or similar
material as the cylinder rotates, against the under surface of the paper.
It will be seen that the amount of surfacing liquid applied to the paper can
be regulated by adjusting the speed of rotation of the wire cylinder, more liquid
being carried up as the speed of rotation is increased, or by the varying pressure
of air or steam.
The improved dandy-roll is preferably situated beneath the paper web as it
passes from the cooling to the calendering rolls.
The cylinder may be driven by suitable mechanism and the bearings upon the
steam or air tube on which the roll rotates may be constructed as found most
convenient.
The wire gauze or other material employed on the rotary cylinder may be
mounted upon some form of frame such as is usually employed for this purpose.
Dated this 28th day of March 1898.
BOULT & WADE,
Agents for the Applicant.
Improvements in or relating to the Manufacture of Paper.
I, WALTER KNOWLES TROTMAN, of 76, Foulden Road, Stoke Newington, in
the County of Middlesex, Engineer, do hereby declare the nature of this inven-
[Price 8d.]

page_text: tion and in what manner the same is to be performed. to be particularly
described and ascertained in and by the following statement;-
This invention relates to the manufacture of paper and has for its object
to cause both sides of the paper to have the same surface, the underside being
softened with water, size, gum or the like to enable the wire marks to be taken
out by the pressure of the calender rolls.
According to this invention the paper may be treated on its upper surface in
the ordinary manner, but to enable the under surface to be similarly treated I
cause the paper to pass over or above a specially arranged and constructed
damping-roll. This damping-roll comprises a rotatable cylinder of wire gauze
or similar material, having a tube running axially through it, and partially
immersed in a trough containing water, size, gum or other substances in solution,
with which the paper is to be treated. A series of jets projecting from the
upper side of the axial tube enables steam or air to be driven through the wire
cylinder so as to transfer the liquid, retained in the meshes of the wire on to
the under surface of the paper as the cylinder rotates.
It will be seen that the amount of surfacing liquid applied to the paper can
be regulated by adjusting the speed of rotation of the wire cylinder, more liquid
being carried up as the speed of rotation is increased, or by varying the pressure
of air or steam.
The improved damping-roll is preferably situated beneath the paper web as it
passes from the cooling to the calendering rolls.
The cylinder may be driven by suitable mechanism and the bearings upon the
steam or air tube on which the roll rotates may be constructed as found most
convenient.
The wire gauze or other material employed on the rotary cylinder may be
mounted upon some form of frame such as is usually employed for this purpose.
In the accompanying drawings,
Figure 1 is an elevation partly in section of the improved damping apparatus,
Figure 2 is an elevation partly broken away of the damping roll.
Like letters indicate like parts throughout the drawings.
Within the
The paper A on leaving the cooling roll B is led over rollers C C¹ and thence
to the calendering rolls D, D', 12. Between the rolls C C and the calendering
rolls is situated a trough E carried upon some suitable form of bracket E¹. The
trough contains a liquid F which may be water, size, gum or other substance
or substances in solution with which the paper is to be treated.
trough a cylinder G of wire gauze is carried in bearings so situated that the
cylinder is partly immersed in the liquid F contained in the trough E.
The cylinder G is rotated by band or other gear connected to some rotating part
of the paper-making mechanism. In the example illustrated a band H passes
round a pulley on the spindle of the roll C¹ and round a second pulley on the
spindle of the cylinder G.
Running axially through the cylinder G is a pipe J from which projects a
series of nozzles J1, the orifices of the latter being situated a short distance from
the inner surface of the wire gauze circumference of the cylinder G. Steam.
or air is led through the pipe J2 through the centre of one of the journals G¹
of the cylinder G to the pipe J. The steam or air issuing from the nozzles J¹
transfers the liquid retained in the meshes of the wire of the cylinder G on to the
under surface of the paper A which passes above it.
As a means of regulating the blast from the nozzles J¹, a pipe may be carried
from the end of the tube J opposite to that at which the steam or air is admitted.
This pipe J³ is smaller than the pipe J2 and may be left open or be more or less
closed by means of a cock, which thus allows the pressure within the tube J to
be varied.
The gearing for bringing about the rotation of the cylinder G may be so
arranged that the speed of the latter can be varied in order to vary the quantity

page_text: of liquid carried round by the cylinder as it rotates and consequently the quan-
tity of liquid transferred to the under surface of the paper.
Having now particularly described and ascertained the nature of the said
invention and in what manner the same is to be performed I declare that what
I claim is:-
1. In the manufacture of paper a rotatable wire gauze or similar cylinder
partially immersed in a liquid and having nozzles within the cylinder through
which steam or air is forced for the purpose of transferring to the surface of the
paper the liquid retained in the meshes of the wire.
2. In the manufacture of paper the combination with a rotatable wire gauze
or similar cylinder of nozzles within the cylinder through which steam or air
can be forced against the inner surface of the cylinder substantially as described.
3. The complete paper damping apparatus substantially as described and illus-
trated in Figure 1 of the accompanying drawings.
4. The paper damping roll substantially as described and illustrated in
Figure 2 of the accompanying drawings.