IMPROVE IN THE MANUFACTURE OF PAPER, AND IN MACHINERY EMPLOYED THEREIN
Year: 1864

page_text: LETTERS PATENT to William Ibotson, of Wraysbury, in the County
of Middlesex, Paper Manufacturer, for the Invention of "IMPROVE
IN THE MANUFACTURE OF PAPER, AND IN MACHINERY EMPLOYED
THEREIN."
Sealed the 80th August 1864, and dated the 3rd March 1864.
PROVISIONAL SPECIFICATION left by the said William Ibotson at the
Office of the Commissioners of Patents, with his Petition, on the
3rd March 1864.
I, WILLIAM IBOTSON, of Wraysbury, in the County of Middlesex, Paper
Manufacturer, do hereby declare the nature of the said Invention for
"IMPROVEMENTS IN THE MANUFACTURE OF PAPER AND IN MACHINERY EMPLOYED
THEREIN," to be as follows:-
My Invention relates to the knotter or strainer through which the pulp and
water pass on to the wire. As at present worked the slits in the knotter
plates become choked, and it is necessary at intervals to rake off or remove
those portions of the pulp and foreign matters which so choke the slits.
The effect of this raking is to force suddenly through the slits more stuff
than is proper, carrying with it more or less dirt, which injuriously affects that
portion of the paper, passing on to the wire while the raking off takes place.
Again, from the choking of the slits a great portion of the knotter plate does
not act properly.

page_text: Now my Invention consists, first, in keeping the surface of the knotter
plates clear or clearer than heretofore, and secondly in carrying off such
portions of the stuff as do not readily pass through the slits in the knotted
plates into a reservoir, from which it is returned to the reservoir, sand strainer,
or other apparatus, through or from which the knotter is supplied, or to the
knotter itself. I cause a flow along the ingoing surface of the knotter plates
in such manner that the matters which would accumulate on and choke
the slits therein are removed. I make one or more apertures in the
knotter in such position that the pulp and water will flow from the point at
which they are supplied to the knotter towards these apertures. So much of
the pulp and water as fails to pass through the slits in the knotter plates
is carried away from the knotter, and passes off through the apertures pro-
vided for that purpose into the reservoir.
SPECIFICATION in pursuance of the conditions of the Letters Patent, filed
by the said William Ibotson in the Great Seal Patent Office on the
3rd September 1864.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, WILLIAM
IBOTSON, of Wraysbury, in the County of Middlesex, Paper Manufacturer,
send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her Letters
Patent, bearing date the Third day of March, in the year of our Lord
One thousand eight hundred and sixty-four, in the twenty-seventh year of Her
reign, did, for Herself, Her heirs and successors, give and grant unto me, the
said William Ibotson, Her special licence that I, the said William Ibotson
my executors, administrators, and assigns, or such others as I, the said William
Ibotson, my executors, administrators, and assigns, should at any time agree
with, and no others, from time to time and at all times thereafter during the
term therein expressed, should and lawfully might make, use, exercise, and
vend, within the United Kingdom of Great Britain and Ireland, the Channel
Islands, and Isle of Man, an Invention for "IMPROVEMENTS IN THE MANU-
FACTURE OF PAPER, AND IN MACHINERY EMPLOYED THEREIN," upon the con-
dition (amongst others) that I, the said William Ibotson, my executors
or administrators, by an instrument in writing under my, or their, or one
of their hands and seals, should particularly describe and ascertain the
nature of the said Invention, and in what manner the same was to be per-
formed, and cause the same to be filed in the Great Seal Patent Office within

page_text: six calendar months next and immediately after the date of the said Letters
Patent.
NOW KNOW YE, that I, the said William Ibotson, do hereby declare the
nature of my said Invention, and in what manner the same is to be per-
formed, to be particularly described and ascertained in and by the following
statement thereof, that is to say:-
My Invention relates to the knotter or strainer through which the pulp
and water pass on to the wire. As at present worked the slits in the knotter
plates become choked, and it is necessary at intervals to rake off or remove
those portions of the pulp and foreign matters which so choke the slits. The
effect of this raking is to force suddenly through the slits more stuff than is
proper, carrying with it more or less dirt, which injuriously affects that portion
of the paper passing on to the wire, while the raking off takes place. Again,
from the choking of the slits a great portion of the knotter plate does not
act properly.
my
Now Invention consists in keeping the surface of the knotter plates
clear or clearer than heretofore by carrying off' such portions of the stuff as
do not readily pass through the slits in the knotter plates in manner hereafter
described. I make one or more openings in the back of the knotter if
worked by jog, or wherever may be most convenient if worked by suction,
and level with the upper surface of the plates, and I make similar openings
opposite to them in the box in which the knotter works. I connect the
openings in the knotter with the openings in the box by flexible tubing. Then
I deliver the "stuff" on to the knotter, so that there may be a flow as nearly
as possible over the whole surface of it towards the openings, through which a
portion passes carrying the dirt and knots with it, and this portion I return
to the machine together with the back water from the wire by the usual
means. By this process all settlement of dirt or stuff on the knotter plates is
prevented, and they do their work without raking or disturbance, con-
sequently with more regularity; they will also require less jog or suction, as
the case may be, thereby producing paper more regular in thickness and
cleaner than heretofore. Before returning the stuff and back water to the
machine they may be passed through an auxiliary knotter, by which the dirt
and knots will be arrested, and from which they may be removed without
disturbing the flow of stuff through the principal knotter on to the machine,
which may consequently be kept in action for any length of time without
being subject to the frequent irregularities caused by raking the knotter in
the ordinary way, and there is this further advantage that the back water
washes all the good fibre through the auxiliary knotter leaving only dirt and

page_text: knots, which may therefore be removed without any of the usual waste attending
the cleaning out of an ordinary knotter.
And having now described the nature of my said Invention, and in what
manner the same is to be performed, I declare that I claim, the employment
of knotters provided with one or more openings, in manner and for the
purpose herein-before described.
In witness whereof, I, the said William Ibotson, have hereunto set
my hand and seal, this Thirty-first day of August, One thousand
eight hundred and sixty-four.