Improvements in and connected with the Manufacture of Multiple Pulp Papers.
Year: 1896

page_text: PROVISIONAL SPECIFICATION.
Improvements in and connected with the Manufacture of Multiple
Pulp Papers.
We, WILLIAM ARTHUR KERSHAW, Paper Manufacturer, and THE MEDWAY
PAPER MILLS COMPANY, LIMITED, both of The Medway Paper Mills, Maidstone,
in the County of Kent, do hereby declare the nature of this invention to be as
follows:-
The present invention relates to improvements in and connected with the
manufacture of multiple pulp papers, more particularly to that of what are known.
as real duplex and triplex pulp papers, on the paper making machine, out of a
corresponding number of different pulps, in one process, so as to give the paper an
appearance of being any colour and quality on one side, and an entirely different
colour and quality on the other side, and if necessary yet another colour and
quality in the centre of the sheet between the two outside surfaces, and yet be in
reality one sheet of finished paper.
The object of the invention is a method of combining the various pulps while in
a liquid or wet state, on the paper machine wire, before the couch roll, and to do so
in such a manner as to give the machine man complete control of the thickness,.
regularity and evenness of the web of any of the pulps to be combined, so that a
very thin or thick surface sheet can be put on perfectly evenly, and at will. This
may be done in various ways, but in practice one of the simplest is found to be the
following. A separate chest and agitator are supplied for each colour or quality
of pulp to be combined, over and above the chests for holding the ordinary pulp.
for the machine, which is run on to the wire in the ordinary way to form the
bottom sheet. Each extra supply chest has a separate service box and overflow
pipe with delivery sluice and water or back water supply for thinning the pulp as.
required, in the usual way, or according to any approved mode of supplying pulp
to a paper making machine. When the top sheet pulp is mixed to the proper
consistency from this chest, it is run down a pipe or shoot, into a narrow box
stretching across and above the wire cloth. This box has holes at regular intervals:
in the side of it, near the bottom, or a long slit and sluice for regulating the supply
through and down to another box used for equalising the flow for delivery on to
the lower sheet. Both these boxes have screws or wedges under them at each end,
the regulation of which helps much towards the even flow of pulp across the wire.
These boxes are supported at each end by standards from the frame bed plate or
ground on either side of the frame, and the bottom box is fitted with any
distributing slices and stops necessary for the regulation of the flow of the pulp,
which must be quite level when passing off the final lips on to the bottom web,
which forms the lower sheet. This is well accomplished by passing the top pulp
in this box under the bottom of an adjustable slice and over a fixed slice which
reaches the bottom of the box, placed rather close to the first slice, which however
is better if it can be moved horizontally as well as vertically, at the bottom of the
fixed slice on the other side. It falls on to a projecting lip, tapered down to stand
at rather more than a right angle with the fixed slice, or by any such convenient
method of delivery. The bottom of this box is brought down to within a short
distance of the web of paper pulp already on the wire, up or down to suit the

page_text: consistency and thickness of the surface sheet, and the lip is placed at or near the
middle of the first vacuum box, or elsewhere according to circumstances and
moreover the lip of this box is placed to give a delivery of the pulp towards the
ordinary slice of the paper machine, so that the flow of the top pulp is in an opposite
direction to the flow of the pulp for the bottom sheet, and thus the flow of the top
pulp over the bottom pulp, which has by this time lost some of its water, holds
back any surplus stuff, equalises it all over the web and rolls back any excess in
front of it by its very force which can be so regulated to suit. This delivery box
over the wire can he placed inside and over the deckle straps of the machine, which
may then with advantage be lengthened and reduced in thickness, or it can be
placed behind them, shortening them if too long by raising the carrying wheel on
the top so as to take up the slack.
The vacuum in the vacuum boxes draws the water from the two pulps at once
thus combining them.
The regulation of the flow of the top sheet pulp, the height of the delivery box
from the wire, with the angle it delivers the pulp down and the vacuum in the first
box give the regulation of the amount of pulp which is carried forward by the wire
as it passes along and forms a thick or thin upper sheet as required.
The double pulp sheet then passes over the second, third and if necessary fourth
vacuum box in succession and passes on to and under the couch roll and presses to
the dragging cylinders in the usual way.
In making triplex papers, a second delivery box would be placed behind the one
described in the most convenient place, and worked in a similar way to give the
desired result.
The novelty of the invention consists in turning the delivery box to face the
slice, making the force of the flow of the upper and lower pulps adverse to one
another and so regulate and level itself for the top surface and one another so as to
form any desired level and even thickness of surface after having passed the vacuum
boxes; and also in running the pulps themselves together instead of forming each
wet sheet by itself as in the old methods and then bringing them together at the
wet end of the machine.
Dated this 9th day of June 1896.
PHILLIPS & LEIGH,
Agents for the Applicants.
COMPLETE SPECIFICATION.
Improvements in and connected with the Manufacture of Multiple
Pulp Papers.
We, WILLIAM ARTHUR KERSHAW, Paper Manufacturer, and THE MEDWAY
PAPER MILLS COMPANY, LIMITED, both of The Medway Paper Mills, Maidstone,
in the County of Kent, 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 present invention relates to improvements in and connected with the
manufacture of multiple pulp papers, more particularly to that of what are known
as real duplex and triplex pulp papers, on the paper making machine, out of a
corresponding number of different pulps, in one process, so as to give the paper an
appearance of being any colour and quality on one side, and an entirely different
colour and quality on the other side, and if necessary yet another colour and quality
in the centre of the sheet between the two outside surfaces, and yet be in reality
one sheet of finished paper.
The object of the invention is a method of combining the various pulps while in

page_text: a liquid or wet state, on the paper machine wire, before the couch roll, and to do.
so in such a manner as to give the machine man complete control of the thickness,.
regularity, and evenness of the web of any of the pulps to be combined, so that
webs of any thickness can be put in perfectly evenly, and at will.
There are many ways in which, and arrangements of apparatus by which, the
object above stated may be realised, and it is to be distinctly understood that the.
present invention does not impose any limit in this respect..
The accompanying figure is a longitudinal vertical section of one arrangement.
adapted to make a 2-pulp paper. The latter together with the way in which it is
used, is as simple and practicable a combination as any; and it is for that reason,
that it has been chosen for illustration and specification.
A separate chest and agitator are provided for each colour or quality of pulp to
be combined into the finished paper, over and above the chests for holding the
ordinary pulp for the machine. The last mentioned pulp is run on to the wire
cloth a in the ordinary way to form the bottom sheet.
Each extra supply chest has a separate service box and overflow pipe with
delivery sluice and water or back water supply for thinning the pulp as required,
either in the usual way or according to any approved mode of supplying pulp to a.
paper making machine.
When the top sheet pulp has been mixed to the proper consistency, it is run
down a pipe or shoot b, into a narrow box e standing across and above the wire
cloth a. There are holes c¹ at regular intervals in the front side of the box c,
near the bottom, for the pulp to flow through downwards into the box d. This
series of holes may be replaced by a slit, and both are provided, when necessary,
with a regulating slide. The box d stands immediately in front of the box c and
at a lower level. Its function is to equalise the flow of pulp for delivery on to
the bottom sheet already on the wire.
Both boxes c, d, are provided with screws or wedges under them at each end,
for regulating the level of the respective box, so as to facilitate the even flow of
pulp throughout the width of the wire a. Further, both the said boxes are
supported by standards from the machine bed plate or from the ground on each
side of the machine. In any case, each one is adjustable both horizontally and
vertically independently of the other.
The bottom of the box d stands only a short distance above the web of paper
pulp already on the wire a, up or down to suit the consistency and thickness of the
top sheet. The flow of the pulp off the final lip g on to the bottom web which
forms the lower sheet, must be quite level. To provide for this, the box d is fitted
with any distributing slices and stops necessary for the regulation of the flow of
the pulp.
e is such a slice and stop, and there is combined with it, a fixed slice f
standing up from a forward continuation of the bottom d' of the box d and near
to the latter. It is preferred that the slice and stop e should be adjustable both.
vertically and horizontally. g' is an additional fixed stop.
g is the final lip above mentioned. It is tapered down from the level of the
continuation above mentioned to an obtuse angle with it, and stands over the
middle of the first vacuum box h, or elsewhere, according to circumstances..
Morcover its position must be one that will enable it to give a delivery of the
pulp towards the ordinary slice of the paper machine, so that the flow of the top
pulp is in an opposite direction to the flow of the pulp for the bottom sheet. Thus
the flow of the top pulp over the bottom pulp which has by this time lost some of
its water, holds back any surplus stuff, equalises it all over the web, and rolls back
any excess in front of it by its very force, there being proper provision for the
regulation of the latter.
The delivery box d above described, may stand inside and over the deckle straps.
of the machine, and which are accordingly and advantageously lengthened and
reduced in thickuess. Or it may stand behind them, they being shortened if they
are then too long, by raising the carrying wheel on the top so as to take up the
Black.

page_text: The vacuum in the vacuum boxes draws the water from the two pulps at once
thus combining them.
The regulation of the flow of the top sheet pulp, the height of the delivery
box d from the wire a, with the angle it delivers the pulp down and the vacuum
in the first box h, give the regulation of the amount of pulp which is carried
forward by the said wire as it passes along and forms a thick or thin top sheet as
required.
The double pulp sheet then passes over the second box i, the third, and if
necessary the fourth, vacuum box, in succession; and passes on to and under the
couch roll and presses to the dragging cylinders in the usual way.
In making triplex papers, a second delivery box d would be placed behind the
one described, in the most convenient place; and worked in a similar way, to give
the desired result.
The novelty of the invention consists in turning the delivery box to face the
slice, feeding the pulp of an upper sheet in a direction opposed to that of the pulp
of a lower sheet, thereby regulating and levelling the delivery of pulp over the
latter, and in running the pulps themselves together with the assistance of one or
more vacuum boxes, instead of forming each wet sheet by itself as in the old
methods and then bringing them together at the wet end of the machine.
Having now particularly described and ascertained the nature of our said inven-
tion, and in what manner the same is to be performed, we declare that what we
claim is :-
The hereinbefore described improvements in and connected with the manufacture
of multiple pulp papers.
Dated this out de
1 1007
PHILLIPS & LEIGH,
No. 22 Southampton Buildings, Chancery Lane, London, W.C.,
Agents for the Applicants.