Improvements in Apparatus suitable for Straining Paper Pulp.
Year: 1899

page_text: Date of Application, 23rd Oct., 1899
Complete Specification Left, 21st July, 1900-Accepted, 20th Oct., 1900
PROVISIONAL SPECIFICATION.
Improvements in Apparatus suitable for Straining Paper Pulp.
I, JAMES WILSON, of 81, The Grove, St. Ann's Hill, Wandsworth, in the County
of Surrey, Engineer, do hereby declare the nature of this invention to be as
follows:-
According to this invention two straining plates are employed inclining down-
wards towards a channel situated between them. Pulp is supplied to the upper
side of one or other of the plates from an inlet common to both. There are two
valves on the inlet which direct the flow respectively to the two plates being
operated by a rocking shaft in such manner that when one is open the other is
closed. Two sluices are provided one along the lower side of each of the plates
and these sluices are also worked by the rocking shaft in such manner that the
sluice at the bottom of each plate is raised immediately the pulp is supplied to it
and is lowered when the supply is cut off.
The action is as follows:-When the supply is cut off from one of the plates
the liquid drains through it leaving the dirt, long pieces of fibre &c. which
cannot pass through comparatively dry and when the supply is turned on again
these are washed off the plates by the rush of liquid into the central trough.
Dated this 23rd day of October 1899.
Improvements in Apparatus suitable for Straining Paper Pulp.
I, JAMES WILSON, of 81, The Grove, St. Ann's Hill, Wandsworth, in the County
of Surrey, Engineer, 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:-
According to this invention two straining plates are employed either horizontal
or inclining downwards towards a channel situated between them. Pulp is
supplied to the upper side of one or other of the plates from an inlet common
to both. There are two valves on the inlet which direct the flow respectively to
the two plates, being operated by a rocking shaft in such manner that when one
is open the other is closed. Two sluices are provided one along the lower side
of each of the plates and these sluices are also worked by a rocking shaft in such
manner that the sluice at the bottom of each plate is raised immediately the
pulp is supplied to it and is then again lowered.
The action is as follows:-When the supply is cut off from one of the plates

page_text: the liquid drains through it leaving the dirt, long pieces of fibre &c. which cannot
pass through comparatively dry and when the supply is turned on again these
are washed off the plates by the rush of liquid into the central trough.
Figure 1 is a side elevation partly in section of the apparatus and Figure 2
is a plan. In these figures the right hand portion is broken away but it is in all
respects similar to the left hand portion.
a are strainer plates of ordinary construction. are channels supplying pulp
to tanks c. are sluices at the upper ends of the plates, and e are sluices at
their lower ends. f is a channel between the plates a. g is a toothed wheel
(omitted from Figure 1) which is driven in any convenient manner and has fixed
to it two cams and j. are rollers carried by rodsk and working in the cam h.
The rods are pivotted to the arms on the rocking shaft to which are also
fixed arms from which the sluices d are suspended. m¹ are rollers carried by
the rods m which are forked at one end and work on a fixed stud n and whose
other ends are pivotted to arms of on rocking shafts o to which are also fixed
arms from which the sluices e are suspended.
When the parts are in the position shown both sluices e and the left hand
sluice are down whilst the right hand sluice d is up. Pulp is therefore being
supplied to the right hand plate a but not to the left hand plate, the pulp flowing
towards it being retained in the tank e by the sluice d. As the cams revolve in
the direction of the arrow Figure 1 the left hand sluice e will first open and almost
immediately afterwards the left hand sluice will open and remain open liberating
the pulp which has collected in the left hand tank c which rushing along the left
hand plate a sweeps the dirt on it into the channel f. The left hand sluice e
then closes and remains closed. After a little less than half a revolution the right
hand sluice d closes and pulp collects in the right hand tank e, the right hand
sluice e opens. the right hand sluice d opens and remains open and the right
hand sluice e closed and remains closed and so on.
Although I have described a pair of plates a it will be understood that the
invention is equally applicable to a single plate or a number of plates. The
plates a may also be inclined instead of horizontal.
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:-
1. The combination of a strainer plate, means for supplying pulp to the plate
and a sluice at each end of the plate.
2. The combination of a strainer plate, means for supplying pulp to the plate,
a sluice at each end of the plate, the sluice at the inlet end being usually open
and the sluice at the other end being usually closed, and means for operating
the sluice whereby periodically the sluice at the inlet end is first closed, then
the sluice at the other end is opened, the sluice at the inlet end is next opened
and lastly the sluice at the other end is closed.
3. The combination of a strainer plate, a tank, means for continuously supply-
ing pulp to the tank, a sluice between the tank and the plate and a second sluice
at the other end of the plate.
4. The combination of a strainer plate, a tank, means for continuously supply-
ing pulp to the tank, a sluice between the tank and the plate, a second sluice at
the other end of the plate the first sluice being usually open and the second sluice
being usually closed and means for operating the sluices whereby periodically
the first sluice is closed, then the second sluice is opened, the first sluice is next
opened and lastly the second sluice is closed.
Dated this 16th day of July 1900.