IMPROVEMENTS IN THE MANUFACTURE OF PAPER PULP, AND IN APPARATUS THEREFOR
Year: 1878

page_text: PROVISIONAL SPECIFICATION left by Josef Brabletz at the Office of the
Commissioners of Patents on the 22nd May 1878.
JOSEF BRABLETZ, Civil Engineer, of Reichenau, Province of Lower Austria, in
the Empire of Austria. "IMPROVEMENTS IN THE MANUFACTURE OF PAPER PULP,
AND IN APPARATUS THEREFOR.”
"
This Invention relates to the production of pulp for making paper by treating
wood, which has been cut small and the bark removed, alternately with lixivium
or lye and steam, and at a gradually increasing temperature with suitable pressure.
The said Invention also comprises apparatus for carrying into effect the said
treatment.
In the accompanying Drawings Figures 1 and 2 represent the necessary apparatus
for carrying my said Invention into practice, which apparatus comprises two
cylindrical boilers C made of sheet iron, and constructed to open at top and bottom.
The upper openings are provided for filling the boilers, and the lower ones a,
Figure 2, for emptying thein. At the lower part of these two boilers is placed, as
shewn in Figure 2, a grating of cast iron 6 covered with a wire sieve, serving to
draw out the liquid by means of the tube c, whilst the solid matters are retained
upon the said sieve. Above these two boilers I provide two pipes f, g, as shewn in
Figures 2 and 4, by means of which steam or lixivium may be introduced into the
said boilers by opening the cocks h or i, Figure 2. There is also, as shewn in
Figures 2 and 4, a pipe k below, by means of which the two boilers may be
emptied by opening cocks Z.
The pipes o, g, for the lixivium or lye, Figures 1, 2, 3, and 4 are united at the
end to separate heating boilers, whence the lixivium may be brought into these
pipes and thence to the digesters or boilers C and to the circulating boiler D.
To the steam pipes ƒ and n, Figures 1, 2, 3, and 4 steam is brought from a
boiler, which steam may be conducted thence into the boilers C and circulating
boiler D. These two digesting boilers communicate by means of pipes d and e
with the circulating boiler D, Figures 1 and 2. The latter is provided at bottom
with an apparatus for heating by gas. This gas is produced by a generator, and is
conducted into the canal E, Figure 2, whence it passes by the tube m under the

page_text: circulating boiler, where it is burnt for heating the boiler. Above this circulating
boiler there are two pipes n, o, Figures 1, 2, and 3, by means of which steam and
lixivium may be introduced by opening the cocks p and g, Figures 1, 2, and 3.
The process is as follows, that is to say :-The two boilers or digesters C, Figures 1
and 2, having been closed up by means of the cover, after being filled with small
pieces of wood, from which the bark has been removed, hot lixivium is introduced
through the pipe g into the two boilers, and passes over the wood therein, the
cocks being opened until the said boilers are quite full. This lixivium has a
solvent action upon a part of the incrusting substances of the wood, at first upon
those parts which are most soluble, which action is allowed to continue for about
an hour. It is then forced into the circulating boiler D by introducing steam into
the boilers by means of opening the cocks h of the pipe f, and through the pipes c, d,
by opening the cocks and 8, Figures 1, 2, and 3. This having been done the two
boilers C, containing the wood are filled with steam, having a pressure of from
six to eight atmospheres, and a corresponding temperature.
The action of the steam has a very softening effect upon the wood, and a solvent
effect upon the incrusting substances; and this should be continued for some
time.
During this interval the lixivium in the circulating boiler D is heated by means
of the said gas apparatus underneath, and is then conducted into the boilers C,
filled with wood, pressing by means of the steam admitted on opening the cock g,
Figures 1 and 3, of the pipe n into the circulating boiler upon the lixivium, which
is thus forced through the pipe into the circulating boiler, and on opening
the cocks pand into the boilers C. The lixivium remains in these two boilers C, C,
for an hour, another part of the incrusting substances of the wood becoming dis-
solved during this time. This lixivium after having operated for some time upon
the wood is again introduced into the circulating boiler D, and the two boilers C
are full of steam, which acts again as at first during the time that the lixivium in
the circulating boiler D is again being heated. This action of the lixivium and of
the steam upon the wood in the boilers C is renewed three or four times, and all
the incrusting substances of the wood become finally dissolved under the action
of the lixivium, which is then drawn out through the pipe k by opening the cocks l,
Figures 2 and 4, and withdrawing the solid matter at a.
With this method of employing two cooking or digesting boilors C and one cir-
'culating boiler D, I can produce 500 kilogrammes of dry material each day; con-
sequently the production of 2,500 kilogrammes of material cach day would
necessitate the employment of five apparatuses of the kind above described, as
'shown in Figure 1, the lixivium and steam pipes being then arranged to serve the
whole, as seen in Figures 1, 3, and 4, at n, o, g, f, v, whence separate branch pipes
lead to the apparatuses.