THE PRODUCT OF SLAG CALLED THEREOF
Year: 1880

page_text: LETTERS PATENT to Joseph Julius
Lancaster, for an Invention of
THE PRODUCT OF SLAG CALLED
THEREOF.
Sachs, of Manchester, in the County of
IMPROVEMENTS IN THE TREATMENT OF
SLACK WOOL, AND IN THE APPLICATION
PROVISIONAL SPECIFICATION left by the said Joseph Julius Sachs
at the Office of the Commissioners of Patents on the 19th November
1880.
"IMPROVE-
MENTS IN THE TREATMENT OF THE PRODUCT OF SLAG CALLED SLACK WOOL,
AND IN THE APPLICATION THEREOF.
JOSEPH JULIUS SACHS, of Manchester, in the County of Lancaster.
22
My Invention relates to the treatment of the product of slag known as slack
wool, and its utilization in the manufacture of papier mache, roofing and similar
felt, card and paste board and other papers, and for other similar purposes.
In carrying out my Invention render by any suitable means the slack-wool
more or less free from substances and constituents which are liable to interfere
with the uses mentioned above, the said substances consisting of globules, sand
grains, pieces of glass and slack, and stiffer fibres which are not capable of being
utilized.
In order to separate these impurities I use, for example, liquids such as water,
with or without an addition of acids, or alkalies, or salts, stir the slack-wool well
therein, and allow it to settle for, say, from a few minutes to half an hour. I then
filter the top layer of the water or liquid through suitable material or apparatus.
The fine elastic fibre remaining on the filter or in the apparatus is then
collected and pressed, when it will be found to be in a proper condition
for use for the above named purposes, in a manner similar to that in which paper
pulp, asbestos, and the like materials are employed.
Or pass a current of air, or other suitable gases, through the slack-wool,
and collect the lightest parts of it at the extreme end of the direction of the
current.
It should be understood that the result of the processes to which 1 subject the
slack wool is that the heavier parts of it as sand, globules, glass, and pieces of

page_text: slack remain at the bottom in the case of liquids, being used, or in case of gases
being used such heavier parts remain behind in the current, whilst the thinner,
more elastic, and lighter fibres come nearer to the top of the liquid or to the end of
the current, and are obtained as such either by filtering in the one case or collecting
in the other case.
The material thus obtained may be used for the manufacture of papier mache or
such like materials used in the arts for the manufacture of roofing felt, of packings
for engines, apparatus, and tubings, for the manufacture of card and paste boards
and papers, with or without the addition of other materials which may serve as
binding materials, such, for example, as glue, starch, alumina-resinate, gypsum,
soluble silicate of soda, cements, and the like:
I also use the material combined with other vegetable fibres, or with asbestos
and suitable powders, such as French chalk (steatite powder) and the like, for the
manufacture of the above named articles.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed
by the said Joseph Julius Sachs in the Great Seal Patent Office on the
13th. May 1881.
JOSEPH JULIUS SACHS, of Manchester, in the County of Lancaster: IMPROVE-
MENTS IN THE TREATMENT OF THE PRODUCT OF SLAG "CALLED SLACK WOOL,
AND IN THE APPLICATION THEREOF.
My said Invention relates to the treatment of the product of slag known as slack
wool, and its utilization in the manufacture of papier mache, roofing and similar
felt, card and paste board, and paper, and for other similar purposes.
In carrying out my said Invention I render the slack wool more or less free from
substances and constituents which are liable to interfere with the uses mentioned
above, the said substances consisting of globules, sand grains, pieces of glass and
slag; and the stiffer fibres which are not capable of being utilized.
In order to separate these impurities I use-liquids, such, for example, as water,
with or without an addition of acids, or alkalies, or salts. I have found that a
solution in water of hydrochloric acid or sulphuric acid, containing, say, from about
2 to 20 per cent. of acid is suitable for the purpose, the strength of the solution
being varied according to the degree of impurity of the slack wool under treatment;
or.I may use a solution of alkalies or salts in water, such, for example, as caustic
soda or potash, silicate of soda, or of potash or ammonia or zinc salt, or chloride of
sodium, the proportions being similar to those hereinbefore referred to in the case
of acids. I stir the slack wool well in the liquid and allow the whole to settle for
say, from a few minutes to half an hour; I then filter the top layer of the water or
liquid through suitable material or apparatus. The fine clastic fibre remaining on
the filter or in the apparatus is then collected and pressed, when it will be found to
be in a proper condition for use for the above named purposes in a manner similar
to that in which paper pulp. asbestos. and the like materials are employed. .
Or pass a current of air or other suitable gases through the slack wool and
collect the lightest parts of it at the extreme end of the direction of the current.
This modification of the Invention may be carried out in the manner illustrated
in the sectional diagram on the accompanying Sheet of Drawings. A is a closed
box or receptacle, into which the slack wool to be treated is introduced through a
door B; C is the nozzle of a bellows or blowing apparatus, and D is an outlet tube
which may terminate in any suitable receptacle. By the act of blowing on to the
slack wool contained in the receptacle A by means of the bellows or blowing
apparatus C, the thinner, more elastic, and lighter fibres are caused to ascend and
are conducted away by the tube D and thence collected, whilst the heavier parts
fall to or remain at the bottom of the receptacle, whence they may be removed
through the door B.
It should be understood that the result of the processes to which I subject the
slack wool is that the heavier parts of it as sand, globules, glass, and pieces of slag,
remain at the bottom in case of liquids being used, or in the case of gases being used
such heavier parts remain behind in the current. whilst the thinner, more elastic,
and lighter fibres come nearer to the top of the liquid or to the end of the current,
and are obtained as such either by filtering in the one case or collecting in the
other case. The material thus obtained may be used for the manufacture of papier
mache or such like materials used in the arts for the manufacture of roofing felt. of
packings for engines, apparatus, and tubing, for the manufacture of card and paste
boards and papers with or without the addition of other materials which may
serve as binding materials, such, for example, as glue, starch, alumina-resinate,
gypsum, soluble silicate of soda, cements, and the like.

page_text: I also use the material combined with vegetable fibres, or with asbestos, and
suitable powders, such as French chalk (steatite powder), and the like for the
manufacture of the above named articles, the relative proportions of the several
constituents being arranged as will be well understood according to the precise
effect which it is required to produce.
Having now described and particularly ascertained the nature of my said
Invention, and the manner in which the same is or may be used or carried into
effect, I would observe in conclusion that what I consider to be novel and original,
and therefore claim as the Invention secured to me by the hereinbefore in part
recited Letters Patent is,
The treatment of slackwool, substantially in the manner herein set forth, so
as to produce therefrom a material capable of being used either alone or in
conjunction with other substances, for the manufacture of papier mache and similar
. articles used in art, of packings for engines, apparatus, tubings, and the like, of
roofing and similar felt, of card and paste board and paper, all substantially as
. hereinbefore described.
In witness whereof, I, the said Joseph Julius Sachs, have to this my
Specification set my hand and seal, this Twelfth day of May, One thousand
eight hundred and eighty-one.
J. JULIUS SACHS. (L.S.)