Improvements in Apparatus for the Manufacture of Paper Pulp.
Year: 1891

page_text: Date of Application, 16th May, 1891
Complete Specification Left. 15th Mar., 1892-Accepted, 14th May, 1892
PROVISIONAL SPECIFICATION.
Improvements in Apparatus for the Manufacture of Paper Pulp.
I, ALFRED SHELDON, of Wells, in the County of Somerset, Millwright and
Engineer, do hereby declare the nature of this invention to be as follows:-
The apparatus consists of a vat near the top of which is fixed a horizontal ring
armed on its upper side with blades or cutters. This ring is carried by arms
projecting inwards from the sides of the vat. Above the ring there is a revolving
dise whose under side is also armed with cutters. Below the ring there is an
elevating apparatus such as a cone containing an Archimedean screw, which may be
mounted upon the same vertical axis as the revolving disc, which is driven either
from above or below.
:-
The action of the apparatus is as follows:-
As the axis revolves the pulp is raised by the Archimedean screw through the
fixed ring to the underside of the disc and is forced out between the ring and the
lisc past the cutters and descends again around the periphery of the ring into
the vat to be again lifted by the Archimedean screw.
is kept up.
Thus a constant circulation
In some cases I aid the circulation by stirrers or a second screw in the lower part
of the vat or there may be a helical partition in the vat around the cone.
In place of driving the disc the ring may be driven or motion may be given to
both.
Dated this 16th day of Nov 1201
CARPMAEL & Co.,
Agents for the Applicant.
COMPLETE SPECIFICATION.
Improvements in Apparatus for the Manufacture of Paper Pulp.
1, ALFRED SHELDON, of Wells in the County of Somerset, Millwright and
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 :-
The apparatus consists of a vat near the top of which is fixed a horizontal ring
armed on its upper side with blades or cutters. Above the ring there is a revolving
disc whose under side is also armed with cutters.
As the axis revolves the pulp is raised through the fixed ring to the underside of
the disc and is forced out between the ring and the disc past the cutters and
descends again into the vat to be again lifted. Thus a constant circulation is
kept up.
I aid the circulation by a helical partition in the vat.
In order that the nature of my said invention may be fully understood and
readily carried into effect I will proceed to describe the drawings hereunto
annexed.

page_text: with water and the fibrous material to be reduced to pulp floating in the water. bis
an upright trunk in the centre of the vat and within the trunk is a hollow standard c.
d is a vertical axis passing up through the standard; it is driven by a belt passing
around the belt pulley d. e is a disc fixed upon the axis and in it there is a dove-
tail groove into which a series of steel cutters e' e' are set so that their cutting edges
are radial. are similar cutters set in a stationary ring supported by the
trunk b. At the lower part of the trunk there is an inlet aperture by which
the water and material from the vat enters the trunk. The floor 2 (Figures 3
and 4) of the trunk is inclined rising helically from the opening & to the line 3.
The object of this incline is to prevent the eddying of the liquid in the trunk. The
rotation of the disc e causes the liquid and material to ascend the trunk and to pass
outwards between the cutters all around and the fibre is pulped by the action of the
cutters. On escaping outwards from between the two rings of cutters the liquid
and material is received upon the deck g around which there is the snail like barrier
plate 4.
The plate leads the liquid and material to the periphery of the vat and to the
top of the deck which inclines slightly upwards from the cutters.
g
9
From the
top of the deck g there is a second incline down which the liquid returns into
the outer part of the vat. This incline is formed by the helical partition which
partly surrounds the trunk band which commencing at the level of the top g of the
deck descends to the bottom of the vat. The circulation of the liquid and
material may thus be traced down this incline i, around the vat until it passes
beneath the deck g and the partition, then it encounters the curved barrier plate
which conducts the liquid and material to the inlet ; it enters the trunk and
passes between the cutters as already described. The foot step for the axis d has
a screw upon it and it can be turned by gear to raise or lower the disc e to adjust
the distance between the teeth e and f.
It is not essential that the vat should be circular; it may be elongated the
circulation around the vat being directed by a partition.
The edges of the cutters e¹ and need not be horizontal; they may be disposed
ipon coned discs or surfaces.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed I declare that what I
claim is:
1. Pulping apparatus in which the liquid and material contained in a vat is
caused to enter a trunk therein, to ascend the said trunk and to pass out between two
rings armed with cutters; one of the said rings being upon a rotating vertical axis;
and in which apparatus also the liquid and material after it has passed between the
cutters is led back into the vat and around the same until it again reaches the
entrance to the trunk.
2. Pulping apparatus in accordance with the preceding claim, and in which
the circulation is aided by a helical partition passing partly around the trunk and
separating the stream leaving the cutters from the return flow entering again into
the trunk at its lower part.
Dated this 11th day of March 1892.
ALFRED SHELDON.