US291785A - T tivtttt - Google Patents
T tivtttt Download PDFInfo
- Publication number
- US291785A US291785A US291785DA US291785A US 291785 A US291785 A US 291785A US 291785D A US291785D A US 291785DA US 291785 A US291785 A US 291785A
- Authority
- US
- United States
- Prior art keywords
- skins
- bath
- hides
- acid
- sulphite
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 210000003491 Skin Anatomy 0.000 description 34
- LSNNMFCWUKXFEE-UHFFFAOYSA-L Sulphite Chemical compound [O-]S([O-])=O LSNNMFCWUKXFEE-UHFFFAOYSA-L 0.000 description 22
- 239000000243 solution Substances 0.000 description 22
- 239000002253 acid Substances 0.000 description 14
- 238000000034 method Methods 0.000 description 14
- 239000010985 leather Substances 0.000 description 10
- VEXZGXHMUGYJMC-UHFFFAOYSA-N HCl Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 8
- LSNNMFCWUKXFEE-UHFFFAOYSA-N sulfonic acid Chemical compound OS(O)=O LSNNMFCWUKXFEE-UHFFFAOYSA-N 0.000 description 6
- BVKZGUZCCUSVTD-UHFFFAOYSA-N Carbonic acid Chemical compound OC(O)=O BVKZGUZCCUSVTD-UHFFFAOYSA-N 0.000 description 4
- KMUONIBRACKNSN-UHFFFAOYSA-N Potassium dichromate Chemical compound [K+].[K+].[O-][Cr](=O)(=O)O[Cr]([O-])(=O)=O KMUONIBRACKNSN-UHFFFAOYSA-N 0.000 description 4
- 239000003086 colorant Substances 0.000 description 4
- SOCTUWSJJQCPFX-UHFFFAOYSA-N dichromate(2-) Chemical compound [O-][Cr](=O)(=O)O[Cr]([O-])(=O)=O SOCTUWSJJQCPFX-UHFFFAOYSA-N 0.000 description 4
- 229940072033 potash Drugs 0.000 description 4
- 235000015320 potassium carbonate Nutrition 0.000 description 4
- BWHMMNNQKKPAPP-UHFFFAOYSA-L potassium carbonate Substances [K+].[K+].[O-]C([O-])=O BWHMMNNQKKPAPP-UHFFFAOYSA-L 0.000 description 4
- KWYUFKZDYYNOTN-UHFFFAOYSA-M potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- VXMKYRQZQXVKGB-CWWHNZPOSA-N Tannin Chemical compound O([C@H]1[C@H]([C@@H]2OC(=O)C3=CC(O)=C(O)C(O)=C3C3=C(O)C(O)=C(O)C=C3C(=O)O[C@H]([C@H]2O)O1)O)C(=O)C1=CC(O)=C(O)C(O)=C1 VXMKYRQZQXVKGB-CWWHNZPOSA-N 0.000 description 2
- 239000007864 aqueous solution Substances 0.000 description 2
- 238000004043 dyeing Methods 0.000 description 2
- 230000002349 favourable Effects 0.000 description 2
- 238000002791 soaking Methods 0.000 description 2
- 235000018553 tannin Nutrition 0.000 description 2
- 229920001864 tannin Polymers 0.000 description 2
- 239000001648 tannin Substances 0.000 description 2
Classifications
-
- C—CHEMISTRY; METALLURGY
- C14—SKINS; HIDES; PELTS; LEATHER
- C14C—CHEMICAL TREATMENT OF HIDES, SKINS OR LEATHER, e.g. TANNING, IMPREGNATING, FINISHING; APPARATUS THEREFOR; COMPOSITIONS FOR TANNING
- C14C3/00—Tanning; Compositions for tanning
- C14C3/02—Chemical tanning
- C14C3/04—Mineral tanning
- C14C3/06—Mineral tanning using chromium compounds
Definitions
- This invention relates to a new process for treating hides or skins, said process consisting in subjecting said hides or skins to the action of a bath prepared from a metallic saltsuch as bichroma-te of potash-and of then treating the same with a bath containing sulphurous acid.
- the skins are done if small pieces cut from the thickest part thereof show that the solutions have entirely penetrated.
- the skins are then ready to be taken out of the solution, and, after the adhering liquor has run off, the skins are introduced into the second bath, which consists, by preference, of sulphite of soda dissolved in water, to which an acid sueh as hydrochloric acidshould be added, in order to set free the sulphurous acid.
- the hydrochloric acid or its substitute may be added to the bath in a free state or through the medium of skins previously pickled, such skins being impregnated with the proper acid.
- the solution may be strong or weak of sulphite, and the quantity of acid used at first may be less than requisite to exhaust the bath of the sulphite, and more acid may be added if the skins show that more is required, which is indicated by the color of the skins. ⁇ Vhon the skins are done, they show a whitish, bluish, or greenish color, according to the time they are kept in the sulphite bath. A skiver which first has been exposed to the action of the bichromate bath for fifteen minutes will be ready by re maining in the sulphite bath about twenty minutes. For thicker skins a proportionately longer time is required.
- the same after having been Withdrawn from the second or sulphite loath, shall be returned to the bichromatebath, which imparts to them a brownish color and leaves them in a favorable condition to be colored black.
- the leather coming from the sulphite bath is especially adapted for light and also for dark colors, and by proper dyeing methods better and brighter colors can be produced than on leather done by tannin. After the leather is done in the manner above de-' scribed, it may be colored, soaped, and greased in the usual way.
- Leather can also be made by reversing the operation and first soaking the hides in a sulphite bath, and then exposing them to the action of the bichromate bath. By using the baths described at a heat of about 80 Fahr enheit the process will be done in a shorter time than if the baths are used cold.
- Tawed leather made by myprocess is very strong, soft, and elastic, and my process is applicable to hides or skins of every description.
- I can use other sulphites or bisulphites in presence of an acid or an aqueous solution of sulphurous acid.
Description
NlTE TATES ATENT FFIQE.
AUGUSTUS SCHULTZ, OF NEW YORK, N. Y.
TAWING HIDES AND SKINS.
SPECIFICATION forming part of Letters Patent No. 291,785, dated January 8, 1884,
Application filed July 18, 1883. (No specimens.)
To all whom it may concern:
Be it known that I, AUeUs'rUs SoHULTZ, a citizen of the United States, residing at New York, in the county and State of New York, have invented new and useful Improvements in Tawing Hides and Skins, of which the following is a specification.
This invention relates to a new process for treating hides or skins, said process consisting in subjecting said hides or skins to the action of a bath prepared from a metallic saltsuch as bichroma-te of potash-and of then treating the same with a bath containing sulphurous acid.
In carrying out my process I unhair the raw hides and prepare them in the same manner in which they are made ready for tanning. If the hides have not been pickled, I subject them to the action of a bath of bichromate of potash in an acid, such as hydrochloric acid 5 or, if the hides have been pickled, they may be treated in a solution of biohromate of potash in water without the addition of an acid. In this solution the hides are left for a longer or shorter time, according to their thickness and to the strength of the solution employed. A skiver or the face of a sheepskin can be done in a strong solution, as above described, in about fifteen minutes, while a full skin roan would require in the same solution about one hour. I call the solution weak if it contains five per cent. or less of the weight of the skins of bichromate of potash, and I call the solution strong if it contains more than five per cent. of bichrom'ate of potash. The skins are done if small pieces cut from the thickest part thereof show that the solutions have entirely penetrated. The skins are then ready to be taken out of the solution, and, after the adhering liquor has run off, the skins are introduced into the second bath, which consists, by preference, of sulphite of soda dissolved in water, to which an acid sueh as hydrochloric acidshould be added, in order to set free the sulphurous acid. The hydrochloric acid or its substitute may be added to the bath in a free state or through the medium of skins previously pickled, such skins being impregnated with the proper acid. The solution may be strong or weak of sulphite, and the quantity of acid used at first may be less than requisite to exhaust the bath of the sulphite, and more acid may be added if the skins show that more is required, which is indicated by the color of the skins. \Vhon the skins are done, they show a whitish, bluish, or greenish color, according to the time they are kept in the sulphite bath. A skiver which first has been exposed to the action of the bichromate bath for fifteen minutes will be ready by re maining in the sulphite bath about twenty minutes. For thicker skins a proportionately longer time is required.
For some skinssuch as calf or steer skinsit is desirable that the same, after having been Withdrawn from the second or sulphite loath, shall be returned to the bichromatebath, which imparts to them a brownish color and leaves them in a favorable condition to be colored black. The leather coming from the sulphite bath is especially adapted for light and also for dark colors, and by proper dyeing methods better and brighter colors can be produced than on leather done by tannin. After the leather is done in the manner above de-' scribed, it may be colored, soaped, and greased in the usual way.
Leather can also be made by reversing the operation and first soaking the hides in a sulphite bath, and then exposing them to the action of the bichromate bath. By using the baths described at a heat of about 80 Fahr enheit the process will be done in a shorter time than if the baths are used cold. Tawed leather made by myprocess is very strong, soft, and elastic, and my process is applicable to hides or skins of every description.
Instead of using sulphite of soda, I can use other sulphites or bisulphites in presence of an acid or an aqueous solution of sulphurous acid.
\Vhat I claim as new, and desire to secure by Letters Patent, is
The withiadescribed process for tawing hides and skins, said process consisting in subjecting the hides or skins to the action of a bath prepared from a metallic salt-such as bichrornate of potash-and then to the action of abath capable of evolving sulphurous acidsuch as a solution of sulphite of soda-4n pres ence of another acid-such as hydrochloric acidsubstantially as described.
In testimony whereof I have hereunto set my hand and seal in the presence of two subscribing witnesses.
AUGUSTUS SCHULTZ.
\Vitnesses:
W. Hwrr, E. F. .lhsrnnnusen.
Publications (1)
Publication Number | Publication Date |
---|---|
US291785A true US291785A (en) | 1884-01-08 |
Family
ID=2360972
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US291785D Expired - Lifetime US291785A (en) | T tivtttt |
Country Status (1)
Country | Link |
---|---|
US (1) | US291785A (en) |
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0
- US US291785D patent/US291785A/en not_active Expired - Lifetime
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