Use of Sulphite Cellulose Extract as a Tanning Material Page: 316
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316 Technologic Papers of the Bureau of Standards IVol. t
in bottles for analysis. Moisture, ash, petroleum ether extract, and
nitrogen were determined by the usual methods used for leather
analysis. The combined tannin was taken as the difference between
100 and the sum of the hide substance (NX 5.62), ash, moisture, and
fats. The results of the experiments will be found in Table 3.
TABLE 3.-Analyses of tanned hide powders
Petro- Hide Com-
Hide powder tanned with- Water Insolu leu sub- tannin
ble ash ether stance,
extract N.62 by dif-
ference
Per cent Per cent Per cent Per cent Per cent
Do.2 -.. . . . . . . . 12. 05 .13 .33 55. 49 32. 00
Quebracho Ord 1. -............-............... 14. 80 .20 .35 54. 55 30. 10
Do.2----------------------------------------.. 14. 66 .16 .28 54. 53 30. 37
Oak Bark 1-_ 14.00 .30 .32 54.34 31.04
Do.____________ _________ ______15. 78 .22 .20 53. 68 30. 12
Cutch .. 16. 00 .18 .26 54. 53 29. 03
Do.2 . ...14.85 .23 .32 55. 80 28. 80
Sulphite No. 1 1 -------------------------------------- 13.25 .26 .22 64. 37 21.90
Do............................................... 14. 25 .31 .30 63. 94 21.20
Sulphite No. 21 .. ..._____________________________________ ...12. 65 .29 .20 64.16 22. 70
D o.2 .._... .... .... ...._ _.. ...... __ . .. . ... 14. 60 .18 .24 62. 88 22. 10
Sulphite No. 4 1 . 13.67 .32 .18 62. 83 23. 00
Do2.............................................. i 13.45 .34 .24 63. 59 22. 58
1 First series of experiments. 2 Series of check experiments.
The Ph value for all tanning solutions was adjusted to 3.5. These
tests show that, with solutions of the same acidity and soluble solids
contents hide powder will fix from 70 to 75 per cent as much material
from sulphite cellulose extracts as it will from the ordinary vegetable
extracts, the time factor being constant. The experiments also
show that the material fixed by hide powder from the sulphite
cellulose extracts is so firmly held as to resist long washing with
water at ordinary temperatures.
(c) BLENDS WITH VEGETABLE EXTRACTs.-The effect of blending
sulphite cellulose extracts with ordinary vegetable extracts was
studied in order to determine whether the tannin content in the
blended extract would show that an equal substitution could be made
on the basis of tannin content. Samples of powdered chestnut wood,
quebracho, and cutch were prepared and passed through a 60-mesh
sieve in order to secure uniform samples. These, together with a
sample of sulphite cellulose extract No. 2, were analyzed for total
solids, soluble solids, insolubles, nontannins and tannins, all solutions
being adjusted to Ph 3.5 before analysis. Solutions were then made
up of quebracho, chestnut wood, and cutch containing one-third
sulphite cellulose extract on the basis of tannin content. The
blended solutions were then analyzed (A. L. C. A. method) and the
results obtained compared with the calculated values for the analysis.
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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/m1/8/?rotate=270: accessed April 23, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.