Improvements in the Manufacture of Leather suitable for Gloves.
Year: 1897

page_text: PROVISIONAL SPECIFICATION.
Improvements in the Manufacture of Leather suitable for Gloves.
I, ALOIS CHIBA, of No. 91, Abertham, near Carlsbad, Bohemia, Glove Manu-
facturer, do hereby declare the nature of this invention to be as follows:-
This invention relates to kid or Chairleder suitable for gloves and to a process
for the manufacture thereof. Gloves made of kid or Chairleder (hereinafter
referred to as leather) according to this invention differ from those known hereto-
fore in that they are not only more durable but, in particular, are not affected by
cold or warm water, either in respect of their durability or, especially, in respect
of their colour.
The glove-leather, both white and coloured, forming the subject of this invention,
has thus, as compared with that hitherto employed, the particular advantage that
it can be treated, for cleaning purposes, simply with water and neutral soap, with-
out injuriously affecting its quality, whereas the leathers hitherto known could
only be cleaned by means of benzine, which operation spoiled not only the quality,
but also the colour of the leather.
The new glove-leather differs essentially from the known leathers, in that it is
subjected to a subsequent tanning with chrome before it is subjected to the dyeing
process.
"
The process for the manufacture of such kid or Chair" glove leathers is in
general as follows:-
After the leather has been thoroughly tanned or tawed with alum, it is allowed
to remain for about 4 to 6 weeks in order to allow the alum to act with the greatest
possible effect upon the leather. On the expiration of this period, the leather is
scraped, brushed, or ausbroschiert in warm water of about 25° Celsius, with the
result that all the constituents or particles that have not been absorbed by the
leather--such as the excess flour, the excess alum, the unconsumed egg-oil, etc.-
are completely washed out. After the leather has been washed clean as far as is
possible by this means, it is tanned or tawed with a chrome fluid, the composition of
which is hereinafter specified. It may, however, be now stated that the proportion
of the chrome fluid to the weight of the leather is most important for the success
of the process.
The composition and mode of preparation of the chrome fluid may be as
follows:-
A solution of the highest possible degree of concentration of hydrated oxide of
chromium in hydrochloric acid is mixed with soda lye, until the solution is neutral,
and a precipitate is formed. This highly concentrated solution of oxychloride of
chromium is suitably diluted--preferably to a density of 22° (measured with a
Baume's areometer at 15° Celsius).
3 litres of this fluid are now added to a quantity of 100 pieces of leather or
skins; these represent in the alum-tawed stated about a weight of 25 kilogs,
inclusive of the excess of alum, flour, etc. To these 3 litres there is added a
further quantity of 30 litres of water, and then the skins are treated with this

page_text: liquid (3 litres of chrome fluid with 30 litres of water) in a fulling vat, for 25 to
30 minutes. The result of this is to cause the white cross-section of the leather
(which cross section has been white up till then) to assume a décided bright green
colouring. After this said subsequent tanning, the skins are treated during a
further full hour with the least possible addition of water in the fulling vat,
together with 4 litres of yellow of egg (10 % of contained salt) to 100 skins
(25 kilogs. in weight). This has for object to moderate as far as possible the
strain" produced on the leather by the chrome-tanning operation.
By this process the glove-leather subjected thereto is rendered more durable
and capable of being washed, because the subsequent tanning with chrome renders
the skins proof against cold and warm water.
Consequently with this process, leather is produced which will neither become
soiled so readily as ordinary glove-leather, nor lose its colour, when subjected
to a washing-operation.
Improvements in the manufacture of Leather suitable for Coves.
I, ALOIS CHIBA, of No. 91, Abertham, near Carlsbad, Bohemia, Glove Manu-
facturer, 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 kid or Chairleder suitable for gloves and to a process
for the manufacture thereof. Gloves made of kid or Chairleder (hereinafter
referred to as leather) according to this invention differ from those known heretofore
in that they are not only more durable, but, in particular, are
affected by cold or warm water, either in respect of their durability or,
as is particularly important in respect of their colour.
not
The glove-leather forming the subject of this invention, has thus, as compared
with that hitherto employed, the particular advantage that it can be treated, for
cleaning-purposes, simply with water and neutral soap, without injuriously affecting
its quality, whereas the leathers hitherto known could only be cleaned by means
of benzine, which injuriously affected not only the quality, but also the colour of
the leather.
The new glove-leather differs essentially from the known leathers, in that it is
subjected to a subsequent tanning with chrome before it is subjected to the dye-
ing-process.
The process for the manufacture of such kid or "Chair" glove leathers is in
general as follows:-
-
After the leather has been thoroughly tanned or tawed with alum, it is allowed to
remain for about 4 to 6 weeks in order to allow the alum to act with the greatest
possible effect upon the leather. On the expiration of this period, the leather is
in warm water at a temperature of about 25° Celsius, with the result that all the
constituents or particles that have not been absorbed by the leather--such as the
excess flour, the excess alum, the unconsumed egg-oil, etc.-are completely washed
out. After the leather has been washed clean as far as is possible by this means,
it is tanned or tawed with a chrome fluid, the composition of which is hereinafter
specified. It may, however, be now stated that the proportion of the chrome fluid
to the weight of the leather is most important for the success of the process.

page_text: The composition and mode of preparation of the chrome fluid may be as
follows:-
A solution of the highest possible degree of concentration of hydrated oxide of
chromium in hydrochloric acid is mixed with soda lye, until the solution is neutral
and a precipitate is formed. This highly concentrated solution of oxychloride
of chromium is suitably diluted--preferably to a density of 22° (measured with
a Baume's areometer at 15° Celsius).
3 litres of this fluid are now added to a quantity of 100 skins; these represent
in the alum-tawed state about a weight of 25 kilogs., inclusive of the excess of
alum, flour, etc. To these 3 litres there is added a further quantity of 30 litres
of water, and then the skins are treated with this liquid (3 litres of chrome fluid
with 30 litres of water) in a fulling vat, for 25 to 30 minutes. The result of this
is to cause the hitherto white cross-section of the leather to assume a decidedly
bright-green colouring. After this supplementary tanning or tawing, the skins
are treated during a further full hour with the least possible addition of water
in the fulling vat, together with 4 litres of yellow of egg (10% of contained salt)
to 100 skins (25 kilogs. in weight). This has for object to moderate as far as
possible the exertion produced on the leather by the chrome tanning or tawing.
By this process the glove-leather subjected thereto is rendered more durable
and capable of being washed, because the supplementary tanning or tawing with
chrome renders the skins proof against cold and warm water.
Consequently with this process, leather is produced which will neither become
soiled so readily as ordinary glove-leather, nor lose its colour when subjected to
washing.
Having now particularly described and ascertained the nature of the said
invention and in what manner the same is to be performed I declare that what I
claim is:-
1. Glove-leather that has been rendered more durable and rendered proof to
washing as regards quality and colour by a supplementary chrome tanning or
tawing.
2. Subjecting thoroughly alum-tawed leather to a supplementary tanning or
tawing with a solution composed of chromium oxychloride in water for the purpose
of rendering the leather capable of being washed in cold or warm water without
suffering in quality or colour.
21
ሰበ
Naomba 1907
F. WISE HOWORTH,
46, Lincoln's Inn Fields, London, W.C., Agent for the Applicant.