IMPROVEMENTS IN PULP STRAINERS
Year: 1885

page_text: We, CARL HEINRICH ROECKNER, and FRANK LIONEL ROECKNER, of N° 8
Tynemouth Place, Tynemouth, in the County of Northumberland, Paper Makers,
do hereby declare the nature of said invention for "IMPROVEMENTS IN PULP
STRAINERS" to be as follows:-
:-
These improvements consist in constructing boxes with one end open composed
of strainers fixed or to slide in or out, so as to be readily cleaned. One or more
fans are fixed in these boxes which are put in motion from the outside so as to
cause what is called the suction through the strainers.
One or a number of such boxes are fixed into a vat, the open ends discharging
the pulp which has passed through the strainers to the paper-machine and can be
so arranged that all the fans are worked from one shaft.
The vat may be divided into compartments, so that the stuff flows from one
to the other.
The boxes may also be formed of any shape, triangular, square circular or of
any number of sides and the strainers fitted to suit requirements. Instead of
boxes the strainers may be formed of tubes in which suitable slits or perforations
have been provided.
The tubes being closed at one end the strained pulp will be delivered to the
paper-machine from their open ends which may fit into a ring, so that when
cleaning is required they may be easily lifted out or in: the suction is also
provided inside these tubes by fans. The strainers in either case may, instead
of being stationary, be attached to the fans and oscillate with them, in which case
the open ends would have to be attached to the vat by an india-rubber or cloth
ring. Any number of these strainers may be fixed into vats, vertically, horizontally
or diagonally.
For the purpose of keeping the strainer plates washed from the outside we may
supply the stuff through a single acting plunger or other pump or let the stuff
pass through a bucket, which when filled discharges itself suddenly into the vat,
so as to keep the stuff in a waving agitation or this agitation may be effected by
mechanical means.

page_text: For cleaning the tube strainers, they will be so arranged as to work free, so that
being set in rapid motion by suitable mechanism the tubes will be cleaned by
centrifugal force.
Where large slits answer the purpose we may have the slits in the strainer
plates stamped instead of cutting them.
We also propose to make these strainers, of any external form, by covering the
framework with wire which may either be coiled round the strainer or fitted in
series of strips leaving such spaces open between the wires as desirable for stuff
to pass through.
We make boxes as above described without fans and give the box a fan like
or oscillating motion.
Dated this 30th day of Tune TQQE

page_text: We, CARL HEINRICH ROECKNER and FRANK LIONEL ROECKNER of No. 8,
Tynemouth Place, Tynemouth in the County of Northumberland, Paper Makers,
do hereby declare the nature of said invention and in what manner the same
is to be performed to be particularly described and ascertained in and by the
following statement:―
These improvements consist in constructing boxes, with one end or it may be
both ends open, forming the strainers, fixed, or to slide in or out, so as to be
readily cleaned. One or more fans are fitted in these boxes and are put in
motion from the outside so as to cause what is called the "suction " through the
strainers.
One or a number of such boxes are fixed into a vat, the open ends discharging
the pulp which has passed through the strainers to the paper-machine and can be
so arranged that all the fans are worked from one shaft.
The vat may be divided into compartments, so that the stuff flows from one to
the other.
These boxes forming the strainers may be of any shape, circular, like cylinders,
triangular, square or of any number of sides to suit requirements.
Instead of boxes the strainers may be formed of tubes in which suitable slits or
perforations have been provided.
The tubes will be preferably closed at one end and the strained pulp after
passing through them will be delivered to the paper-machine from their open ends
which may fit into a ring, so that when cleaning is required they may be easily
lifted out or in. The suction is provided inside these tubes by the fans which are
oscillated by suitable gear from the outside of vat. The strainers may, instead of
being stationary, be attached to the fans and oscillate with them, in which case
the open ends would have to be attached to the vat by an india-rubber or cloth
ring, or the strainers may oscillate whilst the fans are stationary. Any number
of these strainers may be fixed into vats, disposed vertically, horizontally or
diagonally.
For the purpose of keeping the strainers plates washed from the outside we may
supply the stuff through a single acting plunger or other pump or let the stuff
pass through a bucket, which when filled discharges itself suddenly into the vat,
so as to keep the stuff in a waving agitation or this agitation may be effected by
mechanical means on the vat itself.
For cleaning the strainers, they will be so arranged as to work freely so that
being set in rapid motion by suitable mechanism their perforated or slitted surfaces
will be cleaned by centrifugal force.
When large slits answer the purpose, we may have the slits in the strainer plates
stamped instead of cutting them.
DESCRIPTION OF DRAWINGS.
Our pulp strainer as we propose to carry out the invention is constructed in the
following manner.
In the vat A which receives the pulp to be strained are several tubes or

page_text: Inside of these are 2, 3 or more plates fff running the full length of the tube
fixed to the shafts S S S and to the sides of tubes, which serve as fans, besides
giving strength to the tubes.
The shafts S S S are carried in bearings at each end and have each one end
projecting through upon which are keyed levers, h h h which being connected to
a rod worked by an eccentric e at the end, gives an oscillating motion to the
tubes and fans.
Any number of tubes may be in the vat and may either work separately or
divided With several tubes it is preferable to have them arranged as shewn in
the drawing by division plate d, so that the accumulated "knots" etc. may flow
finally into the end compartment (which will form an auxiliary strainer) and may
there be mixed with more water so that the fine pulp still contained in the
stuff can flow away through the slits and the "knots" etc. be taken out when
necessary.
The tubes should be placed so far apart that a workman can get his hand
between.
The closed ends work free in the stuff, while the open ends run through india-
rubber sheet, or other material fitted so well to the tube, that the fibre can only
get through the slits of the tube to flow on to the paper-machine through the
channel at side by sluice v.
Having now particularly described and ascertained the nature of our said
invention and in what manner the same is to be performed, we declare that what
we claim is:-
1st The construction and application of pulp strainers in which the suction is
induced by oscillating fans (or blades acting as such) within square, cylindrical
or other shaped boxes-preferably oscillating with the fans-with perforated or
slitted surfaces disposed horizontally, vertically or diagonally in a vat containing
the pulp substantially as described and shewn.
2nd In such pulp strainers, instead of the boxes and the fans or blades oscillating
together, giving an oscillating movement to the boxes simultaneous with, but in
opposite, or the same direction, as the fans or blades, or giving such oscillating
movement to the boxes as to induce the suction, the fans or blades being stationary
or vice versa substantially as described.
3rd In such pulp strainers-or in other strainers where applicable-the intro-
duction of the pulp into the vat by buckets discharging intermittently, or equivalent
device so as to create waves tending to wash the strainer plates and keep the slits
or perforations open.
4th The combination of parts, comprising the vat containing the stuff-delivered
into it by such means as will keep it in wavy agitation-the cylindrical straining
boxes, oscillating with the fans or blades worked by gearing; the whole con-
stituting the pulp strainer according to the principle of our invention in the form
substantially as described and illustrated by drawings herewith.
Dated the 27th day of March 1886.