Improvements in Apparatus for Straining Paper Pulp.
Year: 1897

page_text: Date of Application, 21st Apr., 1897
Complete Specification Left, 19th Feb., 1898-Accepted, 19th Mar., 1898
PROVISIONAL SPECIFICATION.
Improvements in Apparatus for Straining Paper Pulp.
I, JOHN SMITH, of 1, Claxhengh Cottages, South Hylton, in the County of
Durham, Mechanical Engineer, do hereby declare the nature of this invention
to be as follows:-
:-
In the arrangement of vat generally used at present the horizontal strainer
plate is fixed to the sides or bottom of the vat, and which are or is separate from
the vibrating plate or disc. This vibrating plate receives an up and down motion
by means of a crank or other mechanism. The point between the vat and vibrating
plate or disc is kept tight in order to retain the pulp and this is effected by means
of a thin flat sheet or strip of india-rubber fixed to the vat and vibrating plate.
The movement of the vibrating plate causes alternately a partial vacuum and
compression in the part of the vat between it and the strainer plate, the result being
that the holes or slots in the strainer plate are kept open and clean. This form
of joint between the vibrating plate and the vat only lasts a short time and has
often to be renewed, therefore instead of using india-rubber of a flat section I use
a rubber band of a solid circular section, or a circular section with a hollow core, or a
pneumatic tube. A flange or rim of suitable form and having a recess to suit
the rubber band or tube is fixed to or in one piece with the vat. The vibrating
plate is also provided with a suitable surface for the band or tube. The band
or tube is inserted between the vibrating plate and the flange or rim, and having
certain amount of initial compression when the vibrating plate is farthest from
the strainer plate, will assume an elliptical form and thus keep the joint tight.
When the vibrating plate is nearest to the strainer plate the band or tube will
be still further compressed.
This form of joint is suitable for other forms of strainers.
Improvements in Apparatus for Straining Paper Pulp.
1. JOHN SMITH, of 1, Claxhengh Cottages, South Hylton, in the County of
Durham, Mechanical 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:-
In the arrangement of vat generally used at present the horizontal strainer

page_text: plate is fixed to the sides or bottom of the vat, and which are or is separate from
the vibrating plate or disc. This vibrating plate receives an up and down motion
by means of a crank or other mechanism. The joint between the vat and vibrating
piate or disc is kept tight in order to retain the pulp and this is effected by means
of a thin flat sheet or strip of india-rubber fixed to the vat and vibrating plate.
The movement of the vibrating plate causes alternately a partial vacuum and
compression in the part of the vat between it and the strainer plate, the result being
that the holes or slots in the strainer plate are kept open and clean. This form
of joint between the vibrating plate and the vat only lasts a short time and has
often to be renewed, therefore instead of using india-rubber of a flat section I use
a rubber of a solid circular section, or a circular section with a hollow core, or a
pneumatic tube. A flange or rim of suitable form and having a recess to suit
the rubber band or tube is fixed to or in one piece with the vat. The vibrating
plate is also provided with a suitable surface for the band or tube. The band
or tube is inserted between the vibrating plate and the flauge or rim, and having
a certain amount of initial compression when the vibrating plate is farthest from
the strainer plate, will assume an elliptical form and thus keep the joint tight.
When the vibrating plate is nearest to the strainer plate the band or tube will
be still further compressed.
This form of joint is suitable for other forms of strainers.
In addition to the method above described the arangement may be reversed,
that is the rim or flange fixed to or in one piece with the vat may be on the
underside of the tube or have the tube resting on it, and the surface on which the
tube rests may be recessed or plain. The vibrating plate will therefore rest or bear
on the tube and may have the surface in contact with the tube plain or recessed.
The vibrating plate may be in more than one piece to facilitate the insertion of the
tube in position. In this arrangement the band or tube should be slightly com-
pressed when the vibrating plate is nearest to the strainer plate or at its top
position, and will be still further compressed the further it is removed from this
position, or at its lowest position.
Referring to the drawings,
A is the vat, B strainer plate, C vibrating plate, C disconnectable part of
vibrating plate, D) flange of vat, E guide bracket for vibrating rod F. H tube.
Fig. 1 sectional elevation, Fig. 2 part plan of vat with strainer plate removed.
Having now particularly described and ascertained the nature of this invention
and in what manner the same is to be performed. I declare that what I
claim is:
In apparatus for straining paper, pulp, the rubber band, tube, or equivalent H.
The vat flange or equivalent D and disconnectable part C₁ of the vibrating plate,
all substantially as described and illustrated for the purposes set forth.
Bated this 10th day of February 1900
HERBERT HADDAN & Co.,
Agents to Applicant,
18, Buckingham Street, Strand, W.C., London.
HERBERT HADDAN & Co.,
Agents to Applicant,
18, Buckingham Street, Strand, W.C., London.