Use of Sulphite Cellulose Extract as a Tanning Material Page: 315
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Bou e ] Sulphide Cellulose for Tanning 315
clean dry cloth in order that surplus water might be absorbed, after
which it was dried in a dark room. When dry the skiver was sammied
in damp sawdust for three or four hours, removed, thoroughly
staked and trimmed.
By this procedure excellent samples of tanned leather were secured
with all the sulphite cellulose extracts, which were soft, pliable, and
light in color. In addition, samples were prepared using blends of
sulphite cellulose extracts and other tanning materials to show the
effect of their use in blends upon the color.
These color-test experiments were interpreted as showing that sul-
phite cellulose extracts would be satisfactory for tanning in so far as
their effect on the color of the leather is concerned and that their use
in blends with certain other tanning materials would have a bene-
ficial and brightening effect on the color of the leather produced. The
results of the color tests are illustrated in Figure 1 with samples of
tanned sheepskin skivers. The light color characteristic of the sul-
phite cellulose extracts is evident. It will also be noted that by
blending sulphite cellulose extracts with materials such as quebracho
and cutch the red color of the latter is moderated. Blends with
chestnut wood extract show a marked brightening of the color.
(b) HIDE-POWDER TESTS.-Wilson and Kern3 have devised a
method for determining the tannin content of tanning materials which,
in general, gives lower results than those obtained with the A. L. C. A.
method. In this method the solution of tanning material is first freed
from tannin by shaking with hide powder and then the hide powder
is freed from nontannins by prolonged and drastic washing. A modi-
fication of this method was used in determining the comparative
tanning values of sulphite cellulose and several vegetable extracts.
A solution of the materials to be tested was filtered to remove insolu-
bles and the filtrate made up to contain 40 g of soluble solids to 600 cc
of solution. Twenty grams of dry hide powder were swollen in 150
cc of distilled water, and to this 600 cc of the prepared tanning liquor
was added. The sample was then tanned in the shaking machine
(fig. 2) for 7 hours, allowed to stand overnight and again shaken for
5 hours. The total time of contact between the hide powder and
tanning liquor was 29 hours.
The tanned hide powder was then squeezed in a linen bag and
washed by percolation until the wash water gave a negative test for
tannin with gelatin-salt solution. Further washing was done until
the nontannins, not fixed by the hide powder, were removed, as indi-
cated by the ferric-chloride test. The tanned hide powder was
squeezed free of excess water, dried under room conditions, and placed
a The Chemistry of Leather Manufacture, pp. 215-231 (The Chemical Catalog Co., New York; 1923).
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Wallace, E. L. & Bowker, Roy Clement. Use of Sulphite Cellulose Extract as a Tanning Material, report, November 1, 1926; Washington D.C.. (https://digital.library.unt.edu/ark:/67531/metadc66515/m1/7/: accessed April 17, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.