IMPROVEMENTS IN APPARATUS FOR STRAINING PAPER PULP, TO BE APPLIED TO PAPER MAKING MACHINES
Year: 1881

page_text: LETTERS PATENT to Daniel Bentley, of Church Road, St. Anne's on the Sea,
in the County of Lancaster, Gentleman, for an Invention of "IMPROVEMENTS
IN APPARATUS FOR STRAINING PAPER PULP, TO BE APPLIED TO PAPER
MAKING MACHINES."
PROVISIONAL SPECIFICATION left by the said Daniel Bentley at the
Office of the Commissioners of Patents on the 4th January 1881.
DANIEL BENTLEY, of Church Road, St. Anne's on the Sea, in the County of
Lancaster, Gentleman. "IMPROVEMENTS IN APPARATUS FOR STRAINING PAPER
PULP, TO BE APPLIED TO PAPER MAKING MACHINES."
This apparatus consists of a cylindrical, square, or polygonal cage mounted on a
shaft and placed in a vertical, diagonal, or horizontal position, and rotated by
means of a pulley or suitable gearing.
The bottom or one end of the cylinder or cage is made solid, and secured to the
driving shaft; the opposite end of the cylinder is open, to admit the pulp to be
strained; and the sides or cylinder proper constitutes the straining surface, and is
made of brass or other straining plates similar to the straining plates in ordinary
use. Within the revolving cage is placed a metal obstructor or deflector, the object
of which is to throw the liquid pulp against the internal surface of the revolving
cage in order to prevent the caking or felting of the pulp against the straining
plate surface.
I also may accomplish this object by means of a jogging cam or wheel applied
in such a manner that the whole of the revolving cage has a vibratory motion
given it.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed
by the said Daniel Bentley in the Great Seal Patent Office on the 1st July
1881.
DANIEL BENTLEY, of Church Road, St. Anne's on the Sea, in the County of
Lancaster, Gentleman. "IMPROVEMENTS IN APPARATUS FOR STRAINING PAPER
PULP, TO BE APPLIED TO PAPER MAKING MACHINES."
My said Invention relates to the use for straining paper pulp of a cylindrical,
square, or polygonal cage mounted on a shaft and placed in a vertical, diagonal, or
horizontal position, and rotated by means of a pulley or suitable gearing.
The bottom or one end of the cylinder or cage is made solid, and secured to the
driving shaft; the opposite end of the cylinder is open, to admit the pulp to be
strained; and the sides or cylinder proper constitutes the straining surface, and
may be made of brass or other straining plates similar to the straining plates in
ordinary use. Within the revolving cage is placed a metal obstructor or deflector,
the object of which is to throw 'the pulp against the internal surface of the revolving
cage, in order to prevent the caking or felting of the pulp against the straining
plate surface.
And in order that my said Invention may be fully understood, I shall now
proceed more particularly to describe the same, and for that purpose shall refer to
the accompanying Drawing, which represents a sectional elevation of an apparatus
for straining pulp constructed according to my said Invention.
A is a cylindrical cage fast on a shaft B, which is mounted in suitable bearings
a, a, supported by the frame C, and carries a friction plate b for receiving motion
by means of a friction roll c, horizontal shaft d, and pulley e from any suitable
prime mover. The bottom of the cage is made solid, with the exception that an
orifice or orifices are provided at h, and the top is open to admit the pulp to be
strained, and which is introduced by a pipe or conduit g, whilst the sides e, e, of
the cage are formed by a material similar to that of which pulp straining surfaces
are usually composed, and constitute the straining surface. By adjusting by means
of the screw the position of the friction roll c relatively to the friction plate b,
the speed of the revolving cage may be regulated to suit the quality or volume of
pulp requiring to be strained.
In the operation of the apparatus the pulp admitted into the interior of the
revolving cage is strained under the centrifugal action produced; the fine pulp
passes through the interstices of the cage, and is received into a cistern E
surrounding the cage, and carried upon the frame C, from which cistern the fine
pulp is conducted by a pipe k¹ to the breast vat of the. paper machine, whilst the
knots and extraneous matters retained in the interior of the cage escape therefrom
through the orifice or orifices h, and may be passed through an auxiliary flat
strainer, by which any effluent pulp which they may contain is separated.
I also employ an obstructor, deflector, or deflectors D, D, supported within the
revolving cage A so as to project the pulp against the internal surface of the
revolving cage, and thus prevent the caking or felting of the pulp against
the straining plate surface." The deflectors are carried by a cross beam i, which
also supports the pipe or conduit g conveying the pulp to the revolving cage.
It is preferred to make the cage of brass; the cylinder, forming one casting, is
bored inside, turned outside; and the slits for straining are cut by means of
grooving saws, the cylinder being fastened by screws to the bottom plate of the
strainer cage. In the case however of apparatus of large dimensions the straining
cylinder may be constructed in parts secured together in any suitable manner.
Having now described and particularly ascertained the nature of my said

page_text: Invention, and the manner in which the same is or may be used or carried into
effect, I would observe in conclusion that what I consider to be novel and original,
and therefore claim as the Invention secured to me by the hereinbefore in part
recited Letters Patent is,-
First. The employment of a centrifugal cage for straining paper pulp, substantially
as herein before described.
Second. The combination with a centrifugal cage of an obstructor, deflector, or
deflectors, substantially as and for the purposes hereinbefore described.
In witness whereof, I, the said Daniel Bentley, have to this my Specification
set my hand and seal, this Twenty eighth day of June, One thousand eight
hundred and eighty one.
DANIEL BENTLEY. (L.S.)