Improvements relating to Machines used in the Manufacture of Paper, Paper Pulp, and the like.
Year: 1899

page_text: Improvements relating to Machines used in the Manufacture of Paper,
Paper Pulp, and the like.
We, DAVID NOBLE BERTRAM and SAMUEL MILNE, both of St. Katherine's Works,
Sciennes, Edinburgh, Engineers, do hereby declare the nature of our said inven-
tion to be as follows:
This invention relates to and comprises improvements in the method of and
apparatus for producing a vacuum in the vacuum boxes used in the manufacture
of paper, paper pulp and the like, and has for its objects, first,-to improve the
vacuum. 2ndly, to so produce the vacuum that the vacuum boxes do not
require to be made absolutely air tight by packing,-3rdly, to ensure perfect
steadiness and continuity of suction and to entirely obviate the pulsation caused
by pumps, 4thly, to prevent waste of valuable liquids, and 5thly, to employ
apparatus which can be easily cleaned and renewed and which occupies very
little space.
For the purposes of our invention we employ an ejector of any suitable kind,
and mount it on the vacuum box, or on the pipe leading therefrom, so that it
will extract the water hom such vacuum box, and any air that may leak in.
Heretofore it has been usual when using an ejector for this purpose to operate
it either with steam or with fresh clean water. When operated by steam the
liquid extracted from the vacuum box is heated, which is objectionable, and the
consumption of steam is very considerable. When operated by clean water the
liquid from the vacuum box is so diluted that it is rendered unfit for reuse, and
if run away the dye, loading, etc., contained in the liquid is wasted.
According to our invention we operate the ejector with the same, or similar
liquid as that which is being extracted from the vacuum box or boxes, and
thus avoid both heating and diluting, or wasting of the liquid.
In one arrangement suitable for our purpose the liquid is delivered by the
ejector into a tank, and again passed through the ejector by a pump, a suitable
overflow being provided for the excess of liquor to flow away into a suitable
receptacle for reuse or otherwise as desired.
In another arrangement the ejector may be arranged to discharge into the
tank which receives the water from the wire of paper or pulp making machines,
and be circulated by a "back-water" pump to an over-head tank, from which
the ejector would receive its supply, or the liquid may be taken from the pipe
leading from the pump to the over-head tank.
An ejector may be used with each vacuum box, or one ejector with two or
more boxes.

page_text: Improvements relating to Machines used in the Manufacture of Paper,
Paper Pulp and the like.
We, DAVID NOBLE BERTRAM and SAMUEL MILNE, of St. Katherine's Works,
Sciennes, Edinburgh, Engineers, 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 to and comprises improvements in the method of and
apparatus for producing a vacuum in the vacuum boxes used in the manufacture
of paper, paper pulp and the like, and has for its object to improve the vacuum,
-to so produce the vacuum that the vacuum boxes do not require to be made
absolutely air tight by packing, to ensure perfect steadiness and continuity
of suction and entirely obviate the pulsation caused by pumps, to prevent waste
of valuable liquids and employ apparatus which can be easily cleaned and
renewed and which occupies very little space.
For the purposes of our invention we employ an ejector of any suitable kind,
and mount it on the vacuum box, or on the pipe leading therefrom, so that it
will extract the water from such vacuum box and any air that may leak in.
Heretofore it has been usual when using an ejector for this purpose to operate
it either with steam, or with fresh clean water. When operated by steam the
liquid extracted from the vacuum box is heated, which is objectionable, and the
consumption of steam is very considerable. When operated by clean water the
liquid from the vacuum box is so diluted that it is rendered unfit for reuse, and
if run away the dye, loading, etc., contained in the liquid, is wasted.
According to our invention we operate the ejector with the same or similar
liquid as that which is being extracted from the vacuum box or boxes, and thus
avoid both heating and diluting or wasting of the liquid.
In one arrangement suitable for our purpose the liquid is delivered by the
ejector into a tank, and again passed through the ejector by a pump, a suitable
overflow being provided for the excess of liquor to flow away into a suitable
receptacle for reuse, or otherwise, as desired.
"
In another arrangement the ejector may be arranged to discharge into the
tank which receives the water from the wire of the paper or pulp making machine,
technically called "back water," and the liquid be circulated by a "back-water
pump to an over-head tank (such as now used) from which the ejector would
receive its supply, or the liquid may be taken from the pipe leading from the
pump to the over-head tank.
An ejector may be used with each vacuum box, or one ejector with two or
more boxes.
In order that our said invention may be more readily understood we have
hereunto annexed a sheet of drawings in which Fig. 1 illustrates in elevation,
and Fig. 2 in plan, parts of a set of vacuum boxes of a paper making machine,
the pipes leading from such vacuum boxes, and our improved ejection and
circulating apparatus.
(a), (a), (a) are a set of vacuum boxes (b), (b), (b) the pipes leading from such
boxes and opening into a main pipe (c) common to all. Upon this latter is the
ejector (d). Connected with the ejector is the pipe (c) leading from a rotary
pump (f), the inlet pipe (g) of which dips down into a tank (h). The discharge
outlet () of the ejector lies immediately over the tank as illustrated.
The action is as follows:-At the start the tank is filled with a supply of the
liquid from the machine, sufficient to seal the end of the pipe (g). Motion is

page_text: then imparted to the pump (f) which then raises the liquid in the tank and
forces it, via pipe (e), through the ejector (d) which acting upon the interior of
the vacuum boxes through pipes (b) and (c) exhausts or extracts the liquid and
any air in such boxes, and delivers such liquid through the discharge outlet (i)
into the tank (h).
The action of the pump being continued the liquid thus drawn out of the
boxes and delivered into the tank furnishes the supply of liquid for continuing
the operation or ejection, the liquid circulating through the pump, ejector and
tank continuously.
The outlet orifice (j) allows for the overflow of the excess liquid into a suitable
receptacle for reuse or otherwise if desired.
The pump can also be used for elevating the "back-water" coming from the
machine into an overhead tank as shewn by dotted lines in Fig. 1, and such water
may be used for diluting the pulp or for working the ejector or for any other
part about the paper making machine, the overflow in this case being from the
overhead tank. By this arrangement one pump circulates the back-water and
produces the vacuum on the vacuum boxes.
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:-
1: Producing the vacuum in the vacuum boxes of machines used in the
manufacture of paper, paper pulp, and the like by extracting the liquid from
the vacuum boxes by an ejector, delivering such liquid into a tank, and using
the same liquid for operating the ejector, substantially as and for the purposes
set forth.
2. In combination with machines used in the manufacture of paper, paper pulp
and the like an ejector, a tank, or set of tanks, and a pump, substantially as
and for the purposes set forth.
3. Producing the vacuum in the vacuum boxes, and circulating the "back-
water for the dilution of the pulp in paper making machines, substantially as
set forth.
1
LT
10th
1000
DAVID NOBLE BERTRAM.
SAMUEL MILNE.
By John G. Wilson & Co..
Agents for the Applicants, 55, Market Street, Manchester.