US929552A - Leather-dressing process. - Google Patents

Description

UNITED snares. PA NT ()FFICE.

GEORGE W. OHILDS, OF NEW YORIQ N. Y.

LEATHER-DRESSING PROCESS Specification of Letters Patent.

Patented m 2?, 190,9.

Application filed September 24, 1907. Serial No. $94,304:.

To all whom it 'rrta'y concern:

Be it known that I, GEORGE V. Cl-IILDS. of New York city, in the county and State of New York, have invented a certain new and useful Improvementin Leather-Dressing Processes, whereof the following is a specification. v

My invention is particularly applicable to the manufacture of leather, such as sole leather, which it is desired shall attain the greatest degree of solidity possible with the necessary degree ot'fiexibility. All processes for making such leather have heretofore involved two stages :First, the hides are subjected to the act-ion of a liquor con1pr1s1ng active tannic material until combined with all of the tannin with winch they are capable of combining,- and, second, theleather thus tanned'is then subjected to a loading process wh' h usually consists in impregnating the lea herwith concentrated bark extract.

It isthe object of my invention to impregnate the hides contempm)raneously with an ac-' tive'tannic material and with an inert (nontannic) loading material, so that the re ,quired effect is produced in much less time than if said materials were applied shecee sively as heretofore, and said inert loading material being less costly than the active tannie material heretofore employed for loading purposes, the cost of the dressed leather is correspondingly less than hereto fore. f The process herein contemplated is applied to the hides after they have been' plun'iped with a tannin liquor, until they are colored through, and 155 preferably continued until they have absorbed all o f the ldressing 'which it is possible for [them to absorb. Dressing ofthe desired character may be conveniently formed by mixing sapped or exhausting tanning liquor, prefer:

ably free from n'llneral impurities and containing a high percentage of inert solid matter, wlth fresh tanning liquor or bark extract containing active tannic material, and thenconcentrating the mixture until it is from 1.05 to L3 specific gravity, as described and claimed in Letters Patentof the United States #882,490, granted to lne March 17, 1908. Said dressing may be HilllZLtl as fo1- lows :Hides which have been plumped i'n vats with any suitable tanning solution until they are colored through, are, placed in a rotary drum, and'said dressing,preferably heated,introduced to said drum, conveniently through a ihollow axle or trunnion thereof, and the revolutlon of said drum continued until said dressing is absorbed by the hides.

The hide substance having then combined with allotthe tanninwith which it w ll combine, and the pores of the leather being tilled wltli said dressing; when'dried, the residue. of the dressmg 1n the leather not only renders the latter more solid than f it had not been impregnated with sald dressing, but also adds materially to itsfinal weight; It'may be observed thatif said,

dressing were of-lcss specific gravity,'there would not be SUH'lClQIll; sohd resldue thereof when the leather Its-dried to obtain the result desired. Moreover,-if'said dressing were of agreater specific gravity it would not be absorbed by the leather. Leather treated as last described, may then be bleached, oiled, dried,dampened, and rolled in the usual manner.

I do not desire to limit mysclfto all of the details oit procedure above enumerated,

, 2; The process for treating leather after a it has been tanned, which consists-in impregnating the leather with a liquid dressing of from 1.05 to 1.8 specific gravity containing inert'solid niatterresidue of waste tanning liquor mixed with active tannic material,- and, While the leather is still moist from the tanning); process. r

3. The process for treating leather'after it has been tanned, which consists in impreg nating the leather with a liquid dressing of from 1.05 to 1.3 specific .g'ravity, heated signed my name at New York city, Ni Y2 above fltlnOSIJllQlJllC temperaure, and containthis the thirteenth dayof September 1907. in inert solid matter resi no of waste' tan- 1 9 niiig liquor mixed with active tannin 1iquor, (ILURUL CHILDS 5 and, while the leather is still moist rom the Vitnesses:

tanning process. I'I-ENRY W. HEALY,

in testimony whereof I have hereuntxx JNO. P. ANDERSON.

It is hereby certifie'd that in Letters Patent No. 929,552,'granted July 21, 1909, upon the application of George W. Childs, 61 New York, N. Y., for an improvementin Leather-Dressing Prodessesflpn error ppears in the printed specification requiring correction, as follows: In line 42, page 1, a word exhausting should read exhausted; and that the said Letters Patent should read with this correction therbin that the same may conform to the record hf 'the e in the Patient Ofice.

Signed and sealed this 10th day of Adguat; A. D., 1909.

F. A. TENNANT,

Acting Commim'ongr of Patents.