US1982586A - Chrome tanning process - Google Patents

Chrome tanning process Download PDF

Info

Publication number
US1982586A
US1982586A US173217A US17321727A US1982586A US 1982586 A US1982586 A US 1982586A US 173217 A US173217 A US 173217A US 17321727 A US17321727 A US 17321727A US 1982586 A US1982586 A US 1982586A
Authority
US
United States
Prior art keywords
hide
leather
tanning
pretanning
chrome tanning
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
Application number
US173217A
Inventor
Jessie M Vogel
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
EDWIN B H TOWER JR
Original Assignee
EDWIN B H TOWER JR
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by EDWIN B H TOWER JR filed Critical EDWIN B H TOWER JR
Priority to US173217A priority Critical patent/US1982586A/en
Application granted granted Critical
Publication of US1982586A publication Critical patent/US1982586A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

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
    • C14C3/28—Multi-step processes

Definitions

  • the present invention relates to a chrome taming process for converting a skin or hide into leather.
  • the skin or hide is first softened and cleansed and then its flesh and hair are removed.
  • the skin or hide is treated with lime to loosen its hair and thereby facilitate the removal thereof.
  • the skin or hide After the skin or hide has had its hair removed, it is treated with acid or bate to remove at least its surface lime, and then it is pickled in acid and salt to bring it into condition for chrome tanning.
  • the present invention has for its object to shorten the time required to prepare the skin or hide for chrome tanning and to convert it into leather by chrome tanning.
  • Another object is to set and fix the tannable substance in the skin or hide at a rapid rate upon commencing the tanning thereof.
  • Another object is to retain in the skin or hide for conversion into leather tannable substance before lost in deliming and pickling the skin or hide.
  • Another object is to lessen the loss of tannable substance from the hide in preparing it for tanning and in commencing the tanning thereof.
  • Another object is to obviate pickling the skin or hide before commencing the chrome tanning thereof.
  • Another object is to increase by weight and area the leather yielded from a skin or hide.
  • Another object is to provide plump and fine grained leather.
  • Another object is to provide an expeditious and economical chrome tanning process.
  • the skin or hide after its flesh and hair have been removed and its surface has been delimed is subjected to pretanning in a pretanning liquor containing a mixture of aldehyde, mineral acid, and salt until its tannable substance is set and fixed and conversion thereof into leather commences, and then the skin or hide thus pretanned is subjected to final tanning in chrome tanning liquor until it is converted into leather.
  • the skin or hide need only be surface delimed before commencing the pretanning thereof as the pretanning liquor will remove the remaining lime and place the hide in condition for chrome tanning.
  • the pretanning liquor by which the pretanning of the hide is effected is a mixture of an aidehyde, for instance, formaldehyde, such as is ordinarily employed as a tanning agent, sulphuric as acid, neutral salt, and chromic oxide salt.
  • an aidehyde for instance, formaldehyde, such as is ordinarily employed as a tanning agent, sulphuric as acid, neutral salt, and chromic oxide salt.
  • the essential ingredients or constituents of the pretanning liquor are the aldehyde and the acid.
  • pretanning liquor is a mixture of its ingredients or constituents
  • the quantities and proportons of these ingredients or constituents may be varied through a wide range.
  • the effect of the pretanning liquor upon the hide is the resultant effect of the individual action of each of its ingredients or constituents.
  • the formaldehyde is a tanning agent which fixes and sets the tannable substance in the hide at a rapid rate to lessen the loss thereof from the hide, and it further acts upon the tannable substance in the hide to commence conversion thereof into leather.
  • the lime remaining in the hide after it has been surface delimed is neutralized and dissolved by the sulphuric acid and then eliminated from the hide into the pretanning liquor.
  • the sulphuric acid in the pretanning liquor keeps the hide in condition for the formaldehyde and chromic oxide salt to readily diffuse into the hide and throughout the interior thereof.
  • the chromium or chromic oxide salt is a chrome tanning agent, it commences the chrome tanning in the pretanning of the hide.
  • the sulphuric acid tends to plump and swell the hide, but this effect is counteracted by the neutral salt and also the chromic oxide salt.
  • the pretanning is discontinued and then the hide is subjected to final tanning in a chrome tanning liquor in the ordinary way until it is converted into leather.
  • the time required for the pretanning is of the order of from one-half to three hours.
  • the chrome tanning may commence immediately after the pretanning and the time required therefor is of the order of from two to ten hours.
  • the entire tanning of the skin or hide from the commencement of the pretanning to the completion of the final chrome tanning for ordinary skins or hides will not take more than about six hours performed in a drum or more than about sixteen hours performed in a paddle.
  • the primary ingredients or constituents in the pretanning compound and liquor are formaldehyde, or other water soluble aldehyde, and sulphuric or other suitable acid, and the salt or salts employed therein may be varied.
  • the herein set forth chrome tanning process comprising removing the flesh and hair from the hide and deliming its surface, then pretanning the hide in a mixture of aldehyde, acid, salt, and chromic oxide salt, and any products of reaction thereof, to commence converting it into leather and thereafter completing the tanning of the hide in chrome tanning liquor.
  • chrome tanning process comprising removing the flesh and hair from the hide and deliming its surface, then pretanning the hide in a mixture of aldehyde, mineral acid, salt, and chromic oxide salt, and any products of reaction thereof, to commence converting it into leather and thereafter completing the tanning of the hide in chrome tanning liquor.
  • the herein set forth chrome tanning process comprising removing the flesh and hair from the hide and deliming its surface, then pretanning the hide in a mixture of aldehyde, sulphuric acid, salt, and chromic oxide salt, and any products of reaction thereof, to commence converting it into leather and then completing the tanning of the hide in chrome taming liquor.
  • the herein set forth chrome tanning process in which the hide after th flesh and hair have been removed therefrom and it has been surface 'delimed is subjected to a pretanning liquor containing a mixture of formaldehyde, sulphuric acid, salt, and chromic oxide salt, and any products of reaction thereof, until its tannable substance isset and fixed and c nversion thereof into leather commences, and thereafter the hide thus pretanned is subjected to final tanning in chrome tanning liquor to complete converting its tannable substance into leather.
  • a chrome tanning process in which the hide after its flesh and hair have been removed is subjected to pretanning in a mixture of chromic oxide salt, sulphuric acid, and aldehyde, and any products of reaction thereof, to set and fix its tannable substance and commence conversion thereof into leather, and thereafter the hide thus pretanned is subjected to final tanning in chrome tanning liquor to complete converting it into leather.
  • the herein set forth chrome tanning process in which the hide after its flesh and hair have been removed is subjected to pretanning in a mixture of formaldehyde, sulphuric acid, and chromic oxide salt, and any products of reaction thereof, until its tannable substance is set and fixed and conversion thereof into leather commences, and thereafter the hide thus pretanned is subjected to final tanning in chrome tanning liquor to complete converting it into leather.
  • the herein set forth chrome tanning process in which the hide after its flesh and hair have been removed is subjected to a pretanning liquor containing a mixture of formaldehyde, sulphuric.
  • a chrome tanning process in which the hide after it has been limed and unhaired and then surface delimed, is subjected to a pretanning liquor containing a mixture of formaldehyde, sulphuric acid, chromic oxide salt, and neutral salt, and any products of reaction thereof, and thereafter the hide thus pretanned is subjected to final tanning inchrome tanning liquor to convert its tannable substance into leather.

Description

Patented Nov. 27, 1934 UNITED STATES PATENT OFFICE CHROME TANNING PROCESS waukee. Wis.
No Drawing. Application March 5, 1927, Serial No. 173,217
10 Claims.
The present invention relates to a chrome taming process for converting a skin or hide into leather.
According to the ordinary chrome tanning process, the skin or hide is first softened and cleansed and then its flesh and hair are removed.
The skin or hide is treated with lime to loosen its hair and thereby facilitate the removal thereof.
After the skin or hide has had its hair removed, it is treated with acid or bate to remove at least its surface lime, and then it is pickled in acid and salt to bring it into condition for chrome tanning.
The present invention has for its object to shorten the time required to prepare the skin or hide for chrome tanning and to convert it into leather by chrome tanning.
Another object is to set and fix the tannable substance in the skin or hide at a rapid rate upon commencing the tanning thereof.
Another object is to retain in the skin or hide for conversion into leather tannable substance before lost in deliming and pickling the skin or hide.
Another object is to lessen the loss of tannable substance from the hide in preparing it for tanning and in commencing the tanning thereof.
Another object is to obviate pickling the skin or hide before commencing the chrome tanning thereof.
Another object is to increase by weight and area the leather yielded from a skin or hide.
Another object is to provide plump and fine grained leather.
Another object is to provide an expeditious and economical chrome tanning process.
According to the present invention as it has been performed in practice, the skin or hide after its flesh and hair have been removed and its surface has been delimed, is subjected to pretanning in a pretanning liquor containing a mixture of aldehyde, mineral acid, and salt until its tannable substance is set and fixed and conversion thereof into leather commences, and then the skin or hide thus pretanned is subjected to final tanning in chrome tanning liquor until it is converted into leather.
The skin or hide need only be surface delimed before commencing the pretanning thereof as the pretanning liquor will remove the remaining lime and place the hide in condition for chrome tanning.
In order to further explain the invention, an example thereof as it is ordinarily performed in practice will now be explained.
The skin or hide, after it has been limed and its hair has been removed, is surface delimed by a deliming agent and then subjected to pretannage until its tannable substance is fixed or set and conversion thereof into leather com- 00 mences.
The pretanning liquor by which the pretanning of the hide is effected is a mixture of an aidehyde, for instance, formaldehyde, such as is ordinarily employed as a tanning agent, sulphuric as acid, neutral salt, and chromic oxide salt.
The essential ingredients or constituents of the pretanning liquor are the aldehyde and the acid.
As the pretanning liquor is a mixture of its ingredients or constituents, the quantities and proportons of these ingredients or constituents may be varied through a wide range.
The effect of the pretanning liquor upon the hide is the resultant effect of the individual action of each of its ingredients or constituents.
The formaldehyde is a tanning agent which fixes and sets the tannable substance in the hide at a rapid rate to lessen the loss thereof from the hide, and it further acts upon the tannable substance in the hide to commence conversion thereof into leather. I
The lime remaining in the hide after it has been surface delimed is neutralized and dissolved by the sulphuric acid and then eliminated from the hide into the pretanning liquor.
If the formaldehyde were in a neutral or alkaline condition, it would tend to surface harden the hide by its astringent action thereon, and that would impede the diffusion of theformaldehyde into the hide and the initial and final tanning of the interior of the hide.
The sulphuric acid in the pretanning liquor keeps the hide in condition for the formaldehyde and chromic oxide salt to readily diffuse into the hide and throughout the interior thereof.
When the hide has been pretanned in the pretanning liquor, it is in condition for the final chrome tanning liquor to readily diffuse into its interior and thereby convert it throughout into leather, v
As the chromium or chromic oxide salt is a chrome tanning agent, it commences the chrome tanning in the pretanning of the hide.
The sulphuric acid tends to plump and swell the hide, but this effect is counteracted by the neutral salt and also the chromic oxide salt.
As the hide is only surface delimed before commencing the pretanning thereof, tannable substance before lost in deliming and pickling the n hide is retained in the hide and converted into leather.
When the hide has had its tannable substance fixed and set and conversion thereof into leather has commenced, the pretanning is discontinued and then the hide is subjected to final tanning in a chrome tanning liquor in the ordinary way until it is converted into leather.
The time required for the pretanning is of the order of from one-half to three hours.
The chrome tanning may commence immediately after the pretanning and the time required therefor is of the order of from two to ten hours.
The entire tanning of the skin or hide from the commencement of the pretanning to the completion of the final chrome tanning for ordinary skins or hides will not take more than about six hours performed in a drum or more than about sixteen hours performed in a paddle.
The primary ingredients or constituents in the pretanning compound and liquor are formaldehyde, or other water soluble aldehyde, and sulphuric or other suitable acid, and the salt or salts employed therein may be varied.
The process set forth herein may be modified in various ways without departing from the invention and the principles thereof as defined in the claims hereinafter.
The invention set forth in the foregoing specification is hereby claimed as follows:
1. The chrome tanning process herein set forth in which the hide after having its flesh and hair removed is tanned into leather by subjecting it to pretanning in a mixture of aldehyde, acid, and salt until conversion thereof into leather commences and then to final tanning in chrome tanning liquor until it is converted into chrome tanned leather.
2. The chrome tanning process herein set forth in which the hide after having its flesh and hair removed is tanned into leather by subjecting it to pretanning in a mixture of formaldehyde, acid, and salt until conversion thereof into leather commences and then to final tanning in chrome tanning liquor until it is converted into chrome tanned leather.
3. The herein set forth chrome tanning process, comprising removing the flesh and hair from the hide and deliming its surface, then pretanning the hide in a mixture of aldehyde, acid, salt, and chromic oxide salt, and any products of reaction thereof, to commence converting it into leather and thereafter completing the tanning of the hide in chrome tanning liquor.
4. The herein set forth chrome tanning process, comprising removing the flesh and hair from the hide and deliming its surface, then pretanning the hide in a mixture of aldehyde, mineral acid, salt, and chromic oxide salt, and any products of reaction thereof, to commence converting it into leather and thereafter completing the tanning of the hide in chrome tanning liquor.
5. The herein set forth chrome tanning process, comprising removing the flesh and hair from the hide and deliming its surface, then pretanning the hide in a mixture of aldehyde, sulphuric acid, salt, and chromic oxide salt, and any products of reaction thereof, to commence converting it into leather and then completing the tanning of the hide in chrome taming liquor.
6. The herein set forth chrome tanning process in which the hide after th flesh and hair have been removed therefrom and it has been surface 'delimed is subjected to a pretanning liquor containing a mixture of formaldehyde, sulphuric acid, salt, and chromic oxide salt, and any products of reaction thereof, until its tannable substance isset and fixed and c nversion thereof into leather commences, and thereafter the hide thus pretanned is subjected to final tanning in chrome tanning liquor to complete converting its tannable substance into leather.
7. A chrome tanning process in which the hide after its flesh and hair have been removed is subjected to pretanning in a mixture of chromic oxide salt, sulphuric acid, and aldehyde, and any products of reaction thereof, to set and fix its tannable substance and commence conversion thereof into leather, and thereafter the hide thus pretanned is subjected to final tanning in chrome tanning liquor to complete converting it into leather.
8. The herein set forth chrome tanning process in which the hide after its flesh and hair have been removed is subjected to pretanning in a mixture of formaldehyde, sulphuric acid, and chromic oxide salt, and any products of reaction thereof, until its tannable substance is set and fixed and conversion thereof into leather commences, and thereafter the hide thus pretanned is subjected to final tanning in chrome tanning liquor to complete converting it into leather.
9. The herein set forth chrome tanning process in which the hide after its flesh and hair have been removed is subjected to a pretanning liquor containing a mixture of formaldehyde, sulphuric.
acid, chromic oxide salt, and neutral salt, and any products of reaction thereof, until its tannable substance is 'set and fixed and conversion thereof into leather commences, and thereafter the hide thus pretanned is subjected to final tanning in chrome tanning liquor to complete converting its tannable substance into leather.
10. A chrome tanning process in which the hide after it has been limed and unhaired and then surface delimed, is subjected to a pretanning liquor containing a mixture of formaldehyde, sulphuric acid, chromic oxide salt, and neutral salt, and any products of reaction thereof, and thereafter the hide thus pretanned is subjected to final tanning inchrome tanning liquor to convert its tannable substance into leather.
FREDERICK A. VOGEL.
US173217A 1927-03-05 1927-03-05 Chrome tanning process Expired - Lifetime US1982586A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US173217A US1982586A (en) 1927-03-05 1927-03-05 Chrome tanning process

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US173217A US1982586A (en) 1927-03-05 1927-03-05 Chrome tanning process

Publications (1)

Publication Number Publication Date
US1982586A true US1982586A (en) 1934-11-27

Family

ID=22631019

Family Applications (1)

Application Number Title Priority Date Filing Date
US173217A Expired - Lifetime US1982586A (en) 1927-03-05 1927-03-05 Chrome tanning process

Country Status (1)

Country Link
US (1) US1982586A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2707667A (en) * 1951-04-18 1955-05-03 Du Pont Tanning limed skins
US3254938A (en) * 1962-08-29 1966-06-07 Rodriguez Pedro Villa Leather tanning

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2707667A (en) * 1951-04-18 1955-05-03 Du Pont Tanning limed skins
US3254938A (en) * 1962-08-29 1966-06-07 Rodriguez Pedro Villa Leather tanning

Similar Documents

Publication Publication Date Title
JPS6365720B2 (en)
US3254938A (en) Leather tanning
US4039281A (en) Method for the preparation of leather and fur skins
US1982586A (en) Chrome tanning process
US7063728B2 (en) Process for making chrome tanned leathers
US4560384A (en) Process for tanning hides
JP7461874B2 (en) How to tan animal skins
US2150961A (en) Tanning
US2512708A (en) Resorcinol-aldehyde tanning product
US3114589A (en) Rapid tanning sole leather using polyoxysaccharide bisulfites
US1541819A (en) Method of and liquor for producing tanned leather
US411034A (en) Process of bating
US1909790A (en) Tanning process
GB2057497A (en) Tanning Process
US1587019A (en) Process of quick tannage by means of the one-bath method
EP0064761B1 (en) Pickling and tanning process and pickling composition
GB569385A (en) Improvements in or relating to methods of preparing leather and to leather prepared thereby
US3482925A (en) Process for the rapid tanning of leather
US2016559A (en) Tanning skins or hides
US1977226A (en) Method of tanning hides and skins
US2129748A (en) Process of tanning with aldehydes
RU2198933C1 (en) Offal treatment method
US3551089A (en) Ammonium zirconyl carbonate treatment of chrome-tanned leather
SU118231A2 (en) A method of tanning hard leather
US2987369A (en) Silica-gel free silica, zirconium sulfate, and sodium sulfate tanning agent