IMPROVEMENTS IN APPARATUS FOR STRAINING PAPER PULP
Year: 1880

page_text: LETTERS PATENT to Andrew Paisley, of the Clyde Paper Mills, in the County
of Lanark, North Britain, Engineer, for an Invention of "IMPROVEMENTS IN
APPARATUS FOR STRAINING PAPER PULP."
PROVISIONAL SPECIFICATION left by the said Andrew Paisley at the Office
of the Commissioners of Patents on the 10th December 1880.
ANDREW PAISLEY, of Clyde Paper Mills, in the County of Lanark, North
Britain, Engineer. "IMPROVEMENTS IN APPARATUS FOR STRAINING PAPER PULP."
This Invention relates to improvements in the suction apparatus employed in
combination with the strainer, whether it be a revolving or a stationary strainer,
for straining paper pulp.
In the said suction apparatus, constructed according to this Invention, a tube
extends from the driving end of the strainer frame to near the other end thereof.
At each air space there is secured to the said tube a cup-like flange, partly of
conical form, the smaller end of the conical part being secured to the tube. At the
wider end of the conical cup is a portion of cylindrical form turned to fit and slide
easily in a corresponding cylindrical piece or plate fitted and held stationary to the
frame of the strainer. Upon the outer edge of this stationary piece or plate, and
also around the exterior of the wider end of the conical cup, are flanges to which is
attached a circular strip or ring of elastic medium, which may consist of india
rubber, or any other flexible material, the said strip or ring having one of its sides
attached to the flange on the cone, and the other to the flange on the cylindrical
piece fastened to the strainer frame or division, so that in cross section the said
flexible material is of a bow or horse shoe shape. The said elastic material is fixed
to the flanges by being pinched between confining plates and the said flanges, so
avoiding the necessity of making holes in the elastic medium.
At the part of the air tube which passes through the central hole of the cylindrical
piece, held fastened to the frame of the strainer as aforesaid, a flexible strip or ring
is connected by being pinched on one side between a flange and plate on the tube,
and on the other side between a similar flange and plate around the orifice of the
said cylindrical piece. Or this flexible ring may be of the same bow or horse shoe

page_text: form hereinbefore described with regard to the flexible joint of the conical cup
piece, in which case the cylindrical piece affixed to the strainer frame is provided
with a sleeve carrying the attachment for the one side of the flexible ring, the air
tube sliding in the said sleeve.
In a strainer provided with apparatus constructed according to this Invention,
there is great freedom from tear and wear, and economy of driving power, and also
a much larger quantity of pulp can be strained in a given time under the same
circumstances than can be strained by the system at present in use.
SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said Andrew Paisley in the Great Seal Patent Office on the 10th June
1881.
ANDREW PAISLEY, of the Clyde Paper Mills, in the County of Lanark, North
Britain, Engineer. "IMPROVEMENTS IN APPARATUS FOR STRAINING PAPER PULP."
My said Invention relates to improvements in apparatus for straining paper-pulp,
and has reference to the suction apparatus employed in combination with the
strainer, whether it be a revolving or a stationary strainer, for straining paper pulp.
The said Invention has for its object to so construct the apparatus as to economize
driving power, to reduce wear and tear, and to enable a much larger quantity of
pulp to be strained in a given time under the same circumstances than can be
obtained by the apparatus at present in use.
And in order that my Invention may be properly understood, I now proceed
more particularly to set forth the system, mode, or manner in or under which the
same is or may be used or practically carried into effect, reference being had to the
accompanying Drawings and to the letters and figures marked thereon, that is
to say :-
Figure 1 represents in longitudinal section a revolving paper pulp straining
apparatus provided with suction apparatus constructed according to my said
Invention; Figure 2 is a section of the same taken on the line x, y, Figure 1 ;
Figure 3 represents separately certain parts of the apparatus and a modification as
hereinafter described.
The revolving strainer A is supported in bearings at the sides b, b, of the vat or
receptacle B for the unstrained paper pulp, the said strainer receiving rotation in
any convenient or ordinary manner from a suitable motor. As the revolving
motion of the strainer and also the to and fro motion given to the tube or shaft C,
are or may be effected in the ordinary manner and by the ordinary mechanism, it
is unnecessary to describe these particulars. The tube or hollow shaft C extends
from the driving end of the strainer to near the opposite end thereof, and carries
the suction apparatus constructed according to my Invention. At intervals on the
said tube or shaft C, that is to say, at each air space, there is secured to the said
tube or shaft C a cup-like flange or conical disc E, the smaller end of the conical

page_text: part being formed with a sleeve e, which is fitted on the tube C and is retained in
position by the nut e¹, which clamps the said sleeve of the conical cup against the
shoulder e formed on the tube as shewn. The wider end of the conical flange
disc or cup is formed with a portion e³ of cylindrical form, which is turned to
fit and slide easily in a corresponding cylindrical recessed piece or plate F, bolted
or otherwise held stationary to the arms a projecting from the frame of the
strainer. Upon the outer edge or periphery of the recessed plate F, and also.
around the exterior of the wider end of the conical cup E, are flanges e* and fƒ
respectively, to which is attached a circular strip or ring G of elastic medium, which
may consist of india rubber or any other flexible material, the said strip or ring
having its one side attached to the flange on the conical cup and its other side
attached to the flange on the recessed plate F, so that in cross section the said
flexible material is of a bow or horse shoe shape. The said flexible band is fixed
to the flanges by being clamped thereto by compressing plates es and screws e6, so
that the necessity of making holes in the band G is avoided. The stationary plate F
is formed with a central aperture f¹ through which the tube or shaft C passes, the
annular space between the said tube or shaft and the stationary plate F being closed
by a ring or strip H of india rubber or other flexible material, the said ring being
held securely without the necessity for making holes through it by its inner edge
being clamped by screws between flanges marked c on the tube C and at its outer
edge between a flange and plate c³, c³, around the orifice of the plate F as shewn.
The barrel piece F2 takes the place of the plate F in the apparatus at the one end of
the strainer. A modification in the form and arrangement of the apparatus is shewn
in section in Figure 3, which represents a portion of the shaft C, shewing one of
the conical or cup-like apparatus E in elevation and another in section. In this
modification of the said apparatus the ring G is of the same bow or horse shoe form
at that marked G in Figures 1 and 2, and a ring H2 of a corresponding bow or
horse-shoe form is substituted for the ring H, Figures 1 and 2. The stationary
plate F (which is connected to the strainer arms a, as explained with regard to the
plate F in Figures 1 and 2) is formed with a sleeve ƒ³ carrying the attachment for
the one side of the flexible ring H³, the tube C, to which the other side of the ring
is secured, sliding in the said sleeve. The said ring H2 is secured by flanges and
pinching or clamping plates and screws, essentially as herein before described with
reference to the other flexible rings.
In the end disc at X, as before explained, the flexible band H is dispensed with,
the barrel piece F2 being fastened to the end of the strainer.
When the machine is in operation the strainer is caused to revolve, and a
reciprocating motion is imparted to the tube or shaft C, whereby the conical cups E
are alternately urged forward and drawn back, the cylindrical portions es sliding
within the stationary plates F, thus producing a sucking action, whereby the pulp
within the tank or receptacle B is drawn through the slits of the plates of the
strainer. The flexible bands G and H (or H2), owing to their form, and the method
of their connection, yield readily, the vibration of the conical cups thus allowing
the sucking action to be produced with facility, the cone shape of the cups or
discs E greatly facilitating the action of the machine. The interiors of the said
cups are rendered water tight by the bands G and H, air being free to enter or
leave the said interiors in the ordinary manner through holes in the part of the
tube C, which pass through the interior of the said cups. The supply of unstrained
pulp to the vat A, and the delivery of strained pulp therefrom, are or may be provided
for by the ordinary arrangements adopted for these purposes, and require no
description.
Figure 4 represents in longitudinal vertical section, Figure 5 in end elevation,
and Figure 6 in plan, with a part of the strainer plates broken away, a stationary
or non-revolving paper strainer, to which is applied suction apparatus constructed
according to my Invention. The strainer A' may be of any ordinary construction.
As shewn in the Drawing it is supported upon the frames D, and consists of the
upper chamber a¹ separated from the lower chamber a² by the strainer plates a³.

page_text: In the lower chamber are the conical discs or cups E attached to it by horse-shoe
or bow flexible joints G, fastened by flanges and clamping plates and screws in a
manner essentially similar to that hereinbefore described with regard to Figures 1, 2,
and 3, the one side of the said bands being rigidly clamped to the edges of the cups,
and the other side of the said bands being clamped to the edges of the openings a
in the bottom of the lower chamber a². A vibrating motion is imparted to the said
cups through the connecting rods J, the upper extremities of which are secured to
the tops of the said cups, the lower extremities of said rods being connected to
cranks or eccentrics / carried by the horizontal shaft K, so that the shaft being
rotated or vibrated the conical cups or discs E are caused to rise and fall, and give
the necessary vacuum to strain the pulp. The conical cups E may be of any
suitable material, but preferably of brass, and I do not confine myself to the precise
mechanism shewn in the Drawings for communicating the requisite motion to the
said cup or cups. and strainer, as the said motion may be imparted thereto in any
convenient and well known manner.
Having now described and particularly ascertained the nature of my said
Invention, and the system, mode, or manner, in or under which the same is or may
be used or practically carried into effect, I would observe in conclusion that I do
not claim generally the use of pulsating dises for straining paper pulp in rotating
and stationary strainers, as I am aware that such discs have hitherto been employed
for this purpose, but 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 improvements in rotating strainers for straining paper-pulp, consisting
in constructing or arranging the suction apparatus thereof essentially as herein-
before described with reference to Figures 1, 2, and 3 of the accompanying
Drawings.
Secondly. The improvements in stationary strainers for straining paper-pulp,
consisting in constructing or arranging the suction apparatus thereof essentially
as herein before described with reference to Figures 4, 5, and 6 of the accompanying
Drawings.
Thirdly. The combination with and use in apparatus for straining paper-pulp,
whether the strainers thereof be revolving or stationary, of the conical or cup
shaped discs E, as and for the purpose hereinbefore described and illustrated in the
accompanying Drawings.
Fourthly. The combination with and use in apparatus for straining paper-pulp,
whether the strainers thereof be revolving or stationary, of the bow or horse-shoe
flexible bands forming joints between the discs and the non-pulsating parts of the
apparatus, as hereinbefore described with reference to the bands G and H².
In witness whereof, I, the said Andrew Paisley, have hereunto set my hand
and seal, this Twenty seventh day of May, in the year of our Lord One
thousand eight hundred and eighty one.
ANDREW PAISLEY. (L.S.)