Improvements in Apparatus for Straining Pulp Used in the Manufacture of Paper.
Year: 1887

page_text: Date of Application, 11th May, 1887
Complete Left, 10th Feb., 1888
Complete Accepted, 23rd Mar., 1888
Improvements in Apparatus for Straining Pulp Used in the
Manufacture of Paper.
I GEORGE HIBBERT of 17 The Crescent Gateshead-on-Tyne Engineer in the
County of Durham do hereby declare the nature of this invention to be as follows :-
This Invention relates to improvements in flat strainers and apparatus connected
therewith to form a partial double vacuum and silent shake, and improved strainer
plates, with cleansing apparatus connected therewith for taking the strings from under
the bottom, and discharging them into a channel on one side of the vat. In carrying
out this Invention I place an oblong frame made of wood, brass, or other suitable
material, fitted with fine cut strainer plates. Near the bottom of the frame, the plates are
fixed at an angle, so that the knots or other impurities that are left on the surface of
the plates can be removed into a receiver at the lower end of the frame and let out by
a tap or valve.
The frame is placed in a box or vat made of cast iron, wood, or any suitable
material. The vat or box is made a few inches larger than the frame, which carries
the strainer plates, and round the outside of the frame and inside the vat or box, I fix
a flexible diaphragm to allow the frame to shake, and under the vat or box I fix one
or more flexible diaphragm's, and on a frame under the vat I fix a shaft, with crank's
or cam's on each end to work the diaphragm and give a shake motion to the frame.
One end of the frame inside the vat or box 1 fix on pivots. The other end is worked
by a crank or cant, to give a silent shake to the frame and on each side the frame I fix
brackets regulated with screws, to give a knock on the vat to help the pulp to pass
through the strainer plates.
's
The shake at one end of the frame will cause a partial vacum underneath the strainer
plates & at the same end I fix a spring or springs to bear the weight of the frame

page_text: and plates, so that it will take little power. The strainer plates I make with the
strengthening ribs on the top, so that the grooves on the bottom side, can be kept clear
of strings by a scraper, made of suitable material, and can be worked by rods under
the plates, while at work and made to discharge the strings at one side set apart for
them, so that they will not get into the strained pulp.
The vat or box can be made with loose pieces on each side, so that the frame can be
got up easily to clean.
The clean or strained stuff is taken out of the vat or box by a pipe or aperture at
a suitable level.
1 hin 10th 1 of 1487

page_text: COMPLETE SPECIFICATION.
Improvements in Apparatus for Straining Pulp Used in the
Manufacture of Paper.
I GEORGE HIBBERT of 17 The Crescent Gateshead on Tyne in the County of
Durham 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 :-
This invention relates to improvements in flat strainers, and apparatus connected
therewith, to form a partial double vacuum, and a silent shake, and improved strainer
plate, with cleansing apparatus connected therewith, for taking the strings from under
the plate, and dischargeing them into a channel on one side of the vat.
My said invention is illustrated in the accompanying drawings of which ;
Fig. 1 is a longitudinal vertical section, Fig. 2 is a transverse vertical section, and
Fig. 3 is a plan of a modification of my improved pulp strainer, Fig. 4 is a section of
plate showing the ribs on top side of plate, Fig. 5 is a section of plate showing
grooves on bottom side.
In carrying out this invention, I place an oblong frame A made of wood, brass, or
other suitable material, fitted with fine cut strainer plates a. A¹ is a receiver, and
discharges the pulp on plates a which are fixed at an angle so that knots or other
impurities that are left on the surface of the plates a, are discharged into receiver A
and pass out by pipe P. P' is a wash out pipe.
The frame A is placed in a box or vat B, made of cast iron, wood, or any suitable
material. The vat or box B is made a few inches larger than the frame A which
carries the strainer plates a, and round the sides of the frame A and inside the vat or
box B, I fix a flexible diaphragm C to allow the frame A to shake, and under the vat
or box B I fix one or more flexible diaphragms D and on the frame F¹ I fix a shaft F,
with cranks or cams R on each end of the shaft F to work the diaphragm D and give
a shake motion to the frame A. One end of the frame A 1 fix on pivots H¹ carried
by vat B. The other end of frame A is worked by a crank or cam R to give a silent
shake to the frame A. And on each side of frame A, I fix one or more brackets H,
regulated with screws, to give a knock on the vat B, to help the pulp to pass through
the strainer plates a. The shake at one end of the frame A will cause a partial
vacuum underneath the strainer plates a.
On one end of the frame A, I fix a spring or springs G to bear the weight of the
frame A and the plates a, so that it will take little power.
The strainer plates a, I make with straight ribs I, on the top, as shown in figure 4,
so that the grooves K, on the bottom side of plate a, as shown in fig. 5, can be kept
clean of strings, by scrapers C¹ made of suitable material, and can be worked by rods,
under the bottom side of plates a, while at work, and made to discharge the strings at
one side set apart for them so that they will not get into the strained pulp.

page_text: The vat or box B can be made with loose pieces B¹ on top side, to secure the
flexible diaphragm C to vat B, and so that the frame A can be got up easily to clean
out the vat B. The strained pulp is taken out of the vat or box B at the opening O
by a pipe or apparatus at a suitable level to the paper machine.
Having now described and particularly ascertained the nature of my said invention
and the manner of carrying it into practical effect which I desire to claim and
secure by Letters Patent, is,-
First. The combination and arrangement of apparatus whereby an amount of
vacuum is got for passing the pulp through the strainer plates.
Second. The combination of the jog, to assist the vacuum in passing the pulp
through the plates, and the arrangement under the plates for cleaning away the
strings.
Third. An improved form for making strainer plates, with ribs on the top side, so
that the fine slits in the plates, can be cut straight through the bottom side of plates,
as described and shown on Figures 4 and 5 of the appended drawings.
Dated this 9th day of February 1888