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Use of Sulphite Cellulose Extract as a Tanning Material

By E. L. Wallace and R. C. Bowker
An investigation was conducted to determine the suitability of sulphite cellulose
extracts, derived from the waste liquors discharged from paper pulp mills, for
use in tanning hides for the manufacture of leather. The work included an anal-
ysis of various extracts for tannin content in comparison with vegetable tanning
materials. Information regarding the combination of the tannins in these extracts
with hide substance is presented, derived from actual tanning tests on both hide
powder and pieces of raw hide.
The results show that these extracts contain materials absorbable by hide pow-
der in quantities which compare favorably with the amounts found in the ordinary
vegetable tanning materials. Tanning tests on light skins show that the extracts
are satisfactory in so far as color is concerned. Tests with hide powder showed
that the materials in these extracts available for leather making are firmly held by
hide substance, and actual tanning experiments with hide pieces demonstrate that
they have a satisfactory tanning value, particularly when blended with other
vegetable extracts. The chemical, physical, and aging properties of the tanned
leathers compare favorably with those of leathers prepared without the use of
these extracts.
It is concluded that sulphite cellulose extracts are suitable for use in the actual
tanning processes, and that the tanner may benefit from their use to the extent
that they may be substituted for more costly materials. Their use also is of
direct advantage to the paper-pulp producer in that it will aid in solving the
waste-disposal problem.
I. Introduction_---------------------------------------- ------ 310
II. Purpose of the investigation_--__------------------ --------------310
III. Source of sulphite cellulose extract----------------------------- 311
IV. Methods and results_ --------------------------------------- 312
1. Analyses of sulphite cellulose extracts 3--------------------- 12
2. Tanning experiments ------------------------------- 314
(a) Color tests_-- __- -_____----------__ _ 314
(b) Hide-powder tests_- -__-____---------------- 315
(c) Blends with vegetable extracts-------------------- 316
(d) Pretanning experiments ------------------------- 317
(e) Tanning with blended liquors --------------------319
(f) Evaluation of tanned leather. --------------------- 320
3. Summary_-------- ---------------------------------- 321
V. Conclusion ---------------------------------------------- 321
33464-27 309

Wallace, E. L. & Bowker, Roy Clement. Use of Sulphite Cellulose Extract as a Tanning Material. Washington D.C.. UNT Digital Library. Accessed October 7, 2015.