Improvements in Apparatus for Separating Iron from Paper Stock.
Year: 1891

page_text: COMPLETE SPECIFICATION.
[Communicated from abroad by BRADLEY D. RISING, of Mittineaque, Manu-
facturer, and CHARLES HENRY ATKINS, of Palmer, Salesman, both in the
County of Hampden, State of Massachusetts, United States of America.]
Improvements in Apparatus for Separating Iron from Paper Stock.
I, HENRY HARRIS LAKE, of the firm of Haseltine Lake & Co., Patent Agents,
45 Southampton Buildings in the County of Middlesex, 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 :—
This invention relates especially to the manner of employing or using in the
manufacture of paper, a magnet as a separating device in connection with the
trough through which the paper pulp passes from the pulp vats of the pulping
engines to the paper making machine.
My invention is designed to improve the construction of the apparatus of the
kind or class in which the bottom of the trough is provided with depressions or
riffles extending across it from side to side which riffles are filled with mercury, and
in which the magnet is arranged below the bottom of the trough and not extending
across its whole width.
According to the present invention I dispense with the depressions or riffles, in
the bottom of the trough and with the use of mercury and I apply to the upper
surface of the bottom of the trough one or more metal bars which extend across
the same from side to side, and which are connected with a magnet or magnets
beneath the trough and which extend practically the full width of the trough.
These bars being thus magnetized serve two purposes, first, to form riffles upon the
upper surface of the bottom of the trough, and, second, to make a continuous
magnetic field across the trough from side to side, above its bottom and against and
over which the pulp flows, so that all portions of the pulp are brought within the
field of attraction of this magnetized bar or bars. I prefer as a rule to employ two
of these bars and one magnet.
In the accompanying drawings,
Figure 1 represents a view in longitudinal section of a part of the trough and of
the magnetized cross bars upon the upper surface of the bottom of the trough and
the magnet in side elevation.
Figure 2 is a plan view of the bottom of the trough and of the bars.
Figure 3 is a view in section across the trough from side to side and of the
magnet.
Figures 4 and 5 illustrate modified forms of the device to which reference is
hereinafter made.
In the drawings A represents the trough through which the pulp passes from the
pulp engine to the paper making machine. The trough which is necessarily water-
tight, is inclined and the pulp flows by gravity through it.
The bottom of the trough is preferably composed of copper. Extending
across the trough from side to side and resting upon the bottom a are two bars b,
of metal, preferably soft iron. These bars are placed over a magnet B below the
bottom a of the trough and extend across the same from side to side, and in fact
form the poles of the magnet. The magnet is represented as constructed in the
following manner, viz.: from two bars 2 of soft iron, extending the full width of
the trough and mounted upon a cast-iron block or yoke-piece ³. There is inter-
posed between each of the bars 2, and the block or yoke-piece ³ a thin bar
iron.
of
The bars are wound lengthwise with wire 6, to form long, narrow coils,
and upon the upper edge of each har and the coil about it is placed a piece 66 of
sheet brass. This provides a long magnet extending from one side of the trough
LPrins G21

page_text: to the other.
It is so secured in place as to bring its poles below the bars b, above
the bottom of the trough, and it is connected with a dynamo machine or other
source of electric energy.
I would say, however that I do not confine my invention to this especial manner
of magnetizing the cross bars b, although I consider it a very desirable way of so
doing, and may use as many of the cross bars above the bottom of the trough as
may be desired, although as a rule I consider that two are sufficient.
In operation the pulp flowing through the trough is opposed by the cross-bars
and caused to flow over the same and its course is thereby interrupted, the pulp
caused to be broken up to such an extent that practically all portions thereof are
brought into close contact with the bars, either by striking against them or in
passing in thin sheets over them, so that all sections of the pulp are brought within
the field of attraction of the magnetized bars and the iron particles are thereby
attracted and drawn from the pulp and held by the bars.
It will be understood that the bars, instead of being made plain, that is, of
uniform vertical extent, as in Figure 3, may be provided with rectangular depres-
sions or notches, as in Figure 4. In Figure 5 we have shown instead of one long
magnet extending the width of the trough, a series of independent magnets the
cores of which are extended through the bottom of the trough and sufficiently above
it to form a series of interrupting bars or projections which interrupt the flow of
the pulp, separate it, and which are also magnetized.
Having now particularly described and ascertained the nature of this inven-
tion and in what manner the same is to be performed as communicated to me by
my foreign correspondents I declare that what I claim is :-
1. In an apparatus of the character specified, the combination with the conveying-
trough, of the magnetized bar or bars b, within the trough and resting upon and
extending across the bottom of the same, from side to side, and constituting rifles-
like obstructions against and over which the pulp flows, as and for the purposes set.
forth.
2. The combination with the inclined trough, having the bottom a as set forth,
of the overlying bar or bars extending across the bottom of the trough from side
to side thereof, and the electro magnet B below the bottom of the trough and
serving to magnetize the bar or bars within it, substantially as described.
3. The combination with the bottom a of the inclined trough A, of the metallic
bar or bars upon such bottom, and the magnet B comprising the block or yoke-
piece and the long bars extending practically across the trough, wound with
wire, mounted upon the yoke-piece ³, connected with the bar or bars 6 and
adapted to be connected with an electric generator, substantially as and for the
purposes specified.
4. The combination with a pulp-conveying trough, and with magnetizable bars
within the same, energizing coils located beneath the trough, and adapted to be
connected with a source of electricity, substantially as described and shown.
Dated this 23rd day of June 1801
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London, W.C., Agents for the Applicant.