AN IMPROVED APPARATUS FOR AND METHOD OF TREATING WOOD AND OTHER SIMILAR FIBROUS SUBSTANCES FOR THE MANUFACTURE OF HALF STUFF and Paper.
Year: 1873

page_text: LETTERS PATENT to Carl Dietrich Julius Seitz, of Edinburgh, North
Britain, Analytical Chemist, for the Invention of "AN IMPROVED
APPARATUS FOR AND METHOD OF TREATING WOOD AND OTHER SIMILAR
FIBROUS SUBSTANCES FOR THE MANUFACTURE OF HALF STUFF and Paper.'
PROVISIONAL SPECIFICATION left by the said Carl Dietrich Julius
Seitz at the Office of the Commissioners of Patents, with his
Petition, on the 17th January 1873.
I, CARL DIETRICH JULIUS SEITZ, of Edinburgh, North Britain,
Analytical Chemist, do hereby declare the nature of the said Invention
for
"AN IMPROVED APPARATUS FOR AND METHOD OF TREATING WOOD AND OTHER
SIMILAR FIBROUS SUBSTANCES FOR THE MANUFACTURE OF HALF STUFF AND PAPER,"
to be as follows:
"
-
My Invention relates to an improved apparatus and system for the
treatment of wood and other similar fibrous substances or materials so
as to render it or them suitable alone or in combination for the manu-
facture of paper, and what is known in the paper trade as half stuff.
In Patent No. 3446, 19th November 1872, I describe my improved
apparatus for and method of boiling wood and other similar fibrous

page_text: substances by heating or superheating the caustic soda lyes in a separate
vessel from the wood boiler proper, and causing these hot lyes to circulate
by artificial means throughout the entire system of wood boiler proper,
pipes, and heater or superheater, drawing the cooler portions of the lycs
from the wood boiler, sending them to the heater, and in the same pro- 5
portion allowing the newly heated lyes from the heater to flow into the
wood boiler, thus ensuring a regular and constant circulation of lyes at
any required speed throughout the entire mass of the wood under treat-
ment during the whole time of boiling.
The objects of my present Invention are to cool down the whole 1
contents of the wood boiler proper and heater in the shortest possible
time after the boiling operation has been comploted so as to be able to
run off the waste or spent lyes without any inconvenience or loss of
fibre :-
To utilize the latent heat of the fluid contained in the whole apparatus 1
for heating water to boiling point for washing purposes:-
And lastly, to use this same system of artificial or forced circulation
for rinsing or washing the boiled fibres when still in the wood boiler
proper, thereby rendering them pure or almost pure previous to leaving
the boiler. For these purposes I introduce a second range of pipes 2
which I will call cooling pipes in distinction to the pipes which circulate
the heated lyes, and which I will call heating pipes communicating also
between heater, wood boiler, and circulating apparatus. I further pass
this cooling pipe on its way from wood boiler to heater through a tank
or trough of suitable dimensions which can be filled with water, connect 2
it to the circulating apparatus, and thence to the heater.
inside tank or trough I prefer in the form of a coil or coils.
connect the circulating apparatus with the tank or trough itself.
The pipe
Lastly, I
SPECIFICATION in pursuance of the conditions of the Letters Patent,
filed by the said Carl Dietrich Julius Scitz in the Great Seal 30
Patent Office on the 16th July 1873.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, CARL
DIETRICH JULIUS SEITZ, of Edinburgh, North Britain, Analytical
Chemist, send grecting.

page_text: WHEREAS Her most Excellent Majesty Queen Victoria, by Her
Letters Patent, bearing date the Seventeenth day of January, in the
year of our Lord One thousand eight hundred and seventy-three, in the
thirty-sixth year of Her reign, did, for Herself, Her heirs and successors,
give and grant unto me, the said Carl Dietrich Julius Seitz, Her special
licence that I, the said Carl Dietrich Julius Seitz, my executors, admi-
nistrators, and assigns, or such others as I, the said Carl Dietrich Julius
Seitz, 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 "AN
IMPROVED APPARATUS FOR AND METHOD OF TREATING WOOD AND OTHER SIMILAR
FIBROUS SUBSTANCES FOR THE MANUFACTURE OF HALF STUFF AND PAPER," upon
the condition (amongst others) that I, the said Carl Dietrich Julius Seitz,
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 performed, and cause the same to be filed in the Great Seal
Patent Office within six calendar months next and immediately after the
date of the said Letters Patent.
NOW KNOW YE, that I, the said Carl Dietrich Julius Seitz, do
hereby declare the nature of my said Invention, and in what manner the
same is to be performed, to be particularly described and ascertained in
and by the following statement thereof, reference being had to the
Drawing hereunto annexed, that is to say:—
My Invention relates to an improved apparatus and system for the
treatment of wood and other similar fibrous substances or materials so
as to render it or them suitable alone or in combination for the manu-
facture of paper, and what is known in the paper trade as half stuff.
In Patent No. 3446, 19 November 1872, I describe my improved
apparatus for and method of boiling wood and other similar fibrous
substances by heating or superheating the caustic soda lyes in a separate-
vessel from the wood boiler proper, and causing these hot lyes to circulate
by artificial means throughout the entire system of wood boiler proper,
pipes, and heater or superheater, drawing the cooler portions of the lyes
from the wood boiler, sending them to the heater, and in the same pro-

page_text: Firstly. To cool down the whole contents of the boiler proper в,
heater or superheater H, and pipes a, b, and c, in the shortest possible time
after the boiling operation has been completed so as to be able to run off
the waste or spent lyes without delay, inconvenience, or loss of fibre.
Secondly. To utilize the latent heat of the fluid contained in the whole
apparatus for heating water for washing or rinsing purposes.
Thirdly. To make use of this so obtained hot water for washing or
rinsing the boiled fibres whilst still in the boiler B, thereby rendering
them pure or almost pure previous to leaving the boiler.
For these purposes I introduce a cooling apparatus G, consisting of a
system of pipes d, d, passing through, or up and down, or round a tank
or trough T, which may be filled with water at will. This system of
pipes I connect at one end a to the circulating pump or apparatus P, at
the other end ẞ to the heater or superheater H, with valves or cocks for
connecting or disconnecting between; and lastly, I introduce a pipe e
from the tank or trough T itself to the circulating apparatus P, with tho
necessary valves or cocks for connection or shutting off.
The mode of working will now easily be understood. After the boiling
operation has been completed, and the application of heat to the heater
or superheater H has been discontinued, the necessary change of valves
or cocks is made in order to pin the system of pipes d, d, of the cooling
apparatus C to the entire system, shutting out pipe b. Now the cir-
culating apparatus or pump P is set in operation, passing the whole fluid
in the apparatus at any desired speed round and round, whereby the
latent heat of the fluid is given off in the cooler C, reducing the
temperature within the apparatus and at the same time increasing pro-
portionately the temperature of the water in the cooler C.
Having thus brought down the fluid within the apparatus to boiling
point or nearly so the blow off pipe or boiler B is opened, and the waste
or spent lyos are drained off. This being done the blow-off pipe is shut,
and the circulating pump P being then connected with the cooling tank
or trough T itself by means of pipe e it is made to pump the now hot
water out of the cooling tank or trough T into the boiler B, heater or
superheater H, and pipes a, b, c, and d; when quite full the circulating
pump or apparatus P is shut off from the tank or trough T itself, and
being set in motion rapidly circulates the hot water throughout the
entire system, washing or rinsing the materials under treatment. This
+

page_text: operation of washing or rinsing may be repeated or not at will. The
boiled fibres thus washed or rinsed are now ready for removal to the
breaking engines.
Having now described the nature of my said Invention and in what
manner the same is to be performed, I declare that I claim,―
First. The cooling apparatus and its connection with circulating pump
in the manner and for the purposes herein-before described.
Secondly. The use of the latent heat of the hot fluid within this
apparatus for heating water in the manner and for the purposes herein-
before described.
Thirdly. The use of this so heated water for washing or rinsing in the
manner and for the purposes herein-before described.
In witness whereof, I, the said Carl Dietrich Julius Seitz, have
hereunto set my hand and seal, this Fourteenth day of July One
thousand eight hundred and seventy-three.
T
ATTma