Improvements in Strainer Plates used in the Manufacture of Paper.
Year: 1895

page_text: Date of Application, 27th Nov., 1895-Accepted, 28th Dec., 1895
COMPLETE SPECIFICATION.
Improvements in Strainer Plates used in the Manufacture
of Paper.
We HENRY BURNETT WATSON, Engineer High Bridge Works, City and
County of Newcastle on Tyne, and JOHN STANLEY WATSON, Engineer, High
Bridge Works, City and County of Newcastle on Tyne, 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:-
Our invention relates to improvements in the ordinary rectangular strainer
plates used in the manufacture of paper, and is particularly suitable for use in
connection with oscillating strainers, in which a large amount of paper stuff is
caused to flow rapidly over the surface of the strainer plates fitted into same.
But strainer plates made according to our after described invention can be used
advantageously in any other strainers where our wellknown rectangular strainer
plates (Patent No. 262 January 28, 1859) have for years past been employed,
over which the paper pulp is caused to flow at right angles to the slits.
The strainer plates fitted in many forms of paper pulp strainers, but particularly
in oscillating paper pulp strainers, are at present arranged so that the paper stuff
is preferably caused to travel in a direction at right angles to the "slits," and as it
is imperative in suction strainers to have strengthening ribs on the underside of
such strainer plates, a certain amount of clean paper-stuff is wasted by its rapid
flow across these non-slitted strengthening bars, and its intermixture with the dirt
and other "stuff" rejected by the strainer plate slits.
Figure I is a plan of the uppermost or working side of a slitted strainer plate
after our new method.
Figure II is a plan of the underside of same.
Figure III is a sectional elevation of same.
According to our new invention we construct strainer plates so that the
strengthening bars A. A. A. A. Figure 1 do not run continuously across the plates,
but end at a mid tie-bar B. B from which to the opposite side similar strengthening
bars C. C secure the necessary rigidity of the complete plate for its work. The
advantage of this is, that when paper-stuff or other similar material is caused to
flow over a slitted strainer-plate in the direction shown by the arrows D. D. D. D. D,
such "stuff" is no longer able to avoid passing over the straining slits as it at
present does when the strengthening bars A. A. A. A extend uninterruptedly
across the plate.
Having now particularly described and ascertained the nature of our said inven-
tion, and in what manner the same is to be performed, we declare that what we
claim is,
Firstly. The arrangement of tie-bars or strengthening ribs of rectangular strainer
plates substantially in the manner described and shewn in the accompanying
drawings.
Secondly. The construction of rectangular strainer plates over which paper-pulp
is caused to flow at right angles to the allite on that a maximum

page_text: slit area is obtained with a greatly lessened amount of clean pulp or other similar
material passing across the plates and avoiding the straining-slits than heretofore.
Dated this 25th day of November 1895.
HENRY BURNETT WATSON.
JOHN STANLEY WATSON.