Improvements in Paper Pulp Beating Engines.
Year: 1890

page_text: Date of Application, 25th Nov., 1890
Complete Specification Left, 25th Sept., 1891-Accepted, 31st Oct.. 1891
PROVISIONAL SPECIFICATION.
Improvements in Paper Pulp Beating Engines.
I ALBERT EDWIN REED of Devonshire House Pelham Road Gravesend in
the County of Kent Paper Maker do hereby declare the nature of this invention
to be as follows:-
The object of my invention is to provide a paper pulp beating engine which
whilst requiring less power to operate it will more effectually mix and operate
upon the materials treated than is the case with beating engines as hitherto
constructed.
According to my invention I combine with the engine in the line of travel of
the materials treated a centrifugal pump or forcing device by which the materials
after being operated upon by the roll or rolls and passing through the trough or
channel are pumped or returned to the roll or rolls and so on continuously whilst the
engine is in operation. The roll (or each roll) not having to perform the function
of a lifter may have its ribs or bars but slightly projecting and closer together
than usual so that between them there are not the considerable spaces which in.
ordinary engines prevent much of the materials being properly acted upon.
There may be combined with the engine a passage for the delivery of the
prepared pulp to the stuff chests of the paper making machines so that when the
charge has been properly treated the passage by which the pump delivers back to
the roll or rolls of the beater can be closed and the passage to the said stuff chests
be opened so that the prepared pulp is pumped therethrough.
Dated this 25th day of November 1890.
J. H. JOHNSON & Co.,
47, Lincoln's Inn Fields, London, W.C.
COMPLETE SPECIFICATION.
Improvements in Paper Pulp Beating Engines.
| ALBERT EDWIN REED of Devonshire House, Pelham Road, Gravesend in
the County of Kent, Paper Maker 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 object of my invention is to provide a paper pulp beating engine which
whilst requiring less power to operate it, will more effectually mix and operate
upon the materials treated than is the case with beating engines as hitherto
constructed.
According to my invention I combine with the engine in the line of travel of the
materials treated and directly connected to the trough of the engine a centrifugal
pump or forcing device by which the materials after being operated upon by the
beater roll or rolls and passing through the trough or channel are pumped or returned
to the roll or rolls and so on continuously until the pulp is sufficiently prepared.
The roll (or each roll) is arranged as hereinafter described so that it does not
rotate in any considerable depth of pulp and has not therefore to perform the
function of a lifter and propeller and consequently may have its ribs or bars but
slightly projecting and closer together than usual so that between them there are
not the considerable spaces which in ordinary engines prevent much of the materials
being properly acted upon.
There may be combined with the engine a passage for the delivery of the
prepared pulp to the stuff chests of the paper making machines so that when

page_text: the charge has been properly treated the passage by which the pump delivers
back to the roll or rolls of the beaters can be closed and the passage to the
said stuff' chests be opened so that the prepared pulp is pumped therethrough.
And in order that my invention may be fully understood I shall now proceed
more particularly to describe the same and for that purpose shall refer to the several
figures on the annexed drawings the same letters of reference indicating corre-
sponding parts in all the figures.
Figure 1 is a side elevation and Figure 2 a plan of a pulp beating apparatus
constructed according to my invention in which a centrifugal pump is employed for
circulating the pulp.
Figures 3 and 4 are transverse sections of the trough respectively taken on the
lines 1, 2 and 3, 4 of Figure 2.
Figures 5, 6 and 7 are respectively a side elevation, a plan, and a transverse
section (on the line 5, 6 of Figures 5 & 6) of a modified arrangement wherein a
screw propeller is employed instead of a pump for circulating the pulp.
Referring to Figures 1 and 2 A A2 is a tank or trough through which the pulp
is caused to circulate and in which it is operated on by the beater roll B. The
bottom of the part A of the trough or tank inclines downwards from the front end
where the roll B is situated to the opposite end a and the part at A³ also inclines
.downwards from the end a to the end b. The part A of the trough gradually
reduces in width from a to band at the end terminates in a neck C, which is
connected to the suction end c of a centrifugal pump D. The bottom of the
trough A A may be flat if desired but I prefer to make it, except just beneath
the roll B, concave and preferably semicircular so as to have no angles for the pulp
to collect in. This is shewn clearly in Figures 3 and 4.
The delivery pipe d of the pump is connected to the part A of the trough or tank
in front of the roll B and delivers the material into the tank through a flared or
widened passage so as to spread the pulp that it is efficiently distributed to the
roll B by running down thereto over the inclined surface a². The pulp after passing
under the roll, at once runs down the inclined bottom of the trough without accu-
mulating or rising to any considerable depth or having to be lifted by the roll
over any saddle or rising surface before it reaches the bottom of the trough.
A. branch e from the pipe d leads to the stuff' chest or receptacle and a three way
cock is provided at the junction of the branch e and the inlet passage to the
trough A so that by means of this cock the pulp pumped from the part A2 of the
trough may be directed into the part A to be further acted upon by the roll B or
when the pulp is sufficiently beaten the cock may be turned so as to direct the
pulp into the stuff chests by the branch pipe e. This arrangement allows of the
beating engine being placed on the same level as, or lower than, the stuff chests.
As the roll B has not to act as either a propeller or a lifter of the pulp the knives 4
thereon may be arranged at a much finer pitch than is the case with ordinary
beaters and so the roll can be driven with less motive power than usual. The roll
is mounted as usual in bearings y fitted to slide in guides bolted to the trough or
tank A and provided with screwed rods i and gearing for adjusting the roll. The
roll B may be driven from any suitable prime mover by a strap passing round the 4
pulley on the end of the shaft or axis of the roll and preferably situated
between the parts A and A2 of the trough. The pump D can be driven from
the same end of the axis of the roll by a strap passing round the pulleys q,
which are suitably proportioned to impart to the pump the desired speed relatively
to the speed of the roll B. By driving the pump direct from the axis of the roll B, 5
if the driving strap slips off the pulley p or the motion of the roll be otherwise
stopped the pump will also be stopped and thereby prevent the accumulation of
the pulp in front of the roll. The size of the pump and the speed of rotation
should be regulated according to the quantity of pulp being operated on and it has
been found in practice that for a beater capable of operating on five hundredweight 5
of pulp what is known as a six inch centrifugal pump (in which the diameter across
the vanes or blades is usually about 24 inches) is suitable. D is a washer drum

page_text: which may be of the usual construction mounted and worked in the usual manner.
is the usual emptying valve in the bottom of the trough A for the discharge of
the pulp but this is of course not necessary when the stuff' chests are at the same
level as or at a higher level than the pump and the discharge pipe e is used.
the wash out valve.
y
is
Instead of the centrifugal pump for circulating the pulp through the trough A A²
as hereinbefore described a screw propeller may be employed for the purpose
In
arranged and operated as illustrated in Figures 5, 6 and 7 of the drawings.
this arrangement the lower and discharge end of the trough A' is connected by
a tube or tubular passage d with the trough A just in front of the roll B. In this
tube or passage d fitted to rotate the screw propeller D driven from the axis of
the roll B (by a strap or band passing round the pulleys qr) at such a speed as
to cause the material to be fed to the roll as fast as it passes between the said roll
and the lower grinding surface, a constant circulation of the pulp through the
trough A A being thus maintained until the pump is sufficiently reduced. The
roll B is arranged relatively to the surfaces over which the pulp passes as described
with reference to Figures 1 and 2.
By means of apparatus constructed as hereinbefore described a complete mixing
of the pulp may be effected very rapidly and by reason of the teeth on the roll B
being of fine pitch the roll B serves as a combined beater and refiner, whilst the
apparatus is simple and inexpensive in construction and more compact than ordinary
machines of this kind and less motive power is required to drive it.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed I declare that what I
claim is :-
:-
1. The combination with a pulp beating engine of a centrifugal pump_attached
to the trough for causing a circulation of the pulp through the said trough
substantially as herein before described.
2. In a pulp beating engine the combination of a trough and a beater roll and a
centrifugal pump, or a propeller, for causing a circulation of the pulp through the
trough independently of the beater roll, the beater roll and the trough being
relatively arranged so that the pulp is fed downwards to the roll and passes away
from the roll along the trough in such manner that the roll does not work in any
considerable depth of pulp and has not to act as a lifter of the pulp all substantially
as hereinbefore described.
3. The combination and arrangement of parts constituting the pulp beating
engine herein before described and illustrated in Figures 1 and 2 of the accom-
panying drawings.
4. The combination and arrangement of parts constituting the pulp beating
engine hereinbefore described and illustrated in Figures 5, 6 and 7 of the
accompanying drawings.
D 11: azıl day of September 1891.
J. H. JOHNSON & CO.,
Agents.