US1551000A - Tanning process - Google Patents

Description

Tamimmaiica MODIFt- Ali er TEXTILES & HBERS, i

Patented Au 25, 1925.

UNITED STATES PATENT OFFICE.

HUGH YOUNG, 0F CHRISTINE, TEXAS.

TANNING PROCESS.

No Drawing.

To all whom it may concern:

Be it known that HUGH YOUNG, a citizen of the United States, residing at Christine, in the county of Atascosa and State of Texas, has invented certain new and useful Improvements in Tanning Processes, of which the following is a specification.

This invention relates to the process of treating leather, and more particularly to a process for tanning the same.

The principal object of the present invention resides in a process for tanning leather whereby the hides which are subjected to the treatment with the various .ingredients will enable a hide to be tanned and finished in a minimum amount of time and in a manner which will efficiently provide for the removal of any loose flesh from the hide, leaving the same in a perfect condition for use. i

Another important object of the invention is to provide a tanning process whereby the leather treated will possess all of the essential qualities such as strength, pliability,

'etc., thus producing a finished hide which will meet all of the tests to which it may be subjected.

My process may be briefly stated as follows The first step in the process consists of soaking the hide in soft Water until the same becomes very pliable; secondly, the loose flesh on the hide is removed therefrom. The third step consists in placing the hide into lime water as follows :into a sufficient quantity of water to cover the hide, slack lime is added until a milky liquid is formed. The hide is left in the lime water for a period of from four to twenty-four hours, during which time the hide is aired for a period of approximately five minutes three or four times a day. The purpose of allowing the hide to remain in the lime water for so long a time is to permit the hair 011 the hide to slip therefrom.

The fourth step of my process resides in removing the hair from the hide after the same has been taken out of the lime water and the next step is to again place the hide with the hair removed therefrom into a receptacle or tank containing clear or running water. This step is taken in order to remove the lime from the hide and it sometimes is necessary for this particular undertaking to require anywhere from twentyfour to forty-eight hours. It is to be under- Application filed November 6, 1923. Serial No. 673,161.

stood that the water will be changed three or four times during this time if the hide is not placed into a tank of running water but only in a tank containing still clear water.

However the time necessary it will take to remove all of the lime from the hide will not necessarily have to be two days for the reason that the hide may be examined for determining whether or not there is any lime left therein by pressing the hide and if a dent is left it may be readily under stood that all of the lime has been removed.

The hide is now ready to be placed into a vat or tank containing the tanning mixture, the latter consisting of terra japonica and pulverized alum in the proportions hereinafter designated. The tanning mixture consisting of the above mentioned chemicals is dissolved in hot Water. The hide is then dipped into the ooze formed by. the tanning mixture in the hot water after the ooze has been cooled. The hide is aired three or four times until colored.

After the hide has been left in the vat wherein is placed the tanning mixture for the desirable length of time, the same is removed and the hide side is then peltedthat is, the flesh of the animal left on the hide after skinning is removed. The grain side of the hide is then slicked. The next step consists in oiling both sides with fish oil and allowing the treated hide to be dried in the shade.

In treating the hides with the tanning mixture, if the hide is dry, the same may be soaked in salt water until perfectly soft. The pelt side of the hide is then covered with pulverized alum after which the hide is folded up and laid away for a period of approximately two days or longer, depending on the size and weight of the hide. The terra japonica of'1 lbs. to 5 lbs. according to the size and thickness of the hide is then dissolved in the water and the hide is placed in the ooze formed thereby and left therein from two to ten days.

For calf, sheep and all other hides about the same size, mix 1 lbs. of terra japonica and lb. of powdered alum. The hide of this character is left in the tanning mixture of the above proportions for a period of from one to two days.

For one to two year old hides, 3 lbs. of terra japonica and 1 lb. of powdered alum is used and the hide in this instance is left to be treated in the mixture [or a period from three to five days.

For cow 0r ox hides, 5 to 8 lbs. of terra japonica and l to 2 lbs. of pulverized alum accordingto the size and thickness of the hide are used and the hide is left in the ooze from 5 to 12 days in this case.

It is sometimes desirable to color the hide and in the following paragraph I have described the manner in which the leather will be subjected to various ingredients hereinafter more fully set forth, whereby a flesh color will be obtained.

To 1 quart of ooze, 2 tablespoonsful of lamp black and 1 tablespoonsful of copperas is added, the ingredients are then placed in a rustic pot with old rusty iron placed therein and boiled. The hide is treated with the above ingredients and whereupon a flesh color will be obtained.

The hide or stretch is worked out while damp. For 100 lbs. of green hides or wet soaked flint hides the following amount of oil and tallow are used :To 1 gallon of Water and dissolved therein is added one pint sulphonated oil, 3 lbs. of tallow, 1 lb. of parafline, and pint neatsfoot oil.

It will thus be seen from the foregoing description that a tanning process for the treatment of leather has been provided which Will efficiently and easily permit the hides treated therewith to be tanned in a comparatively short while and furthermore obviate the necessity of having to employ numerous chemicals and the necessity of a number of steps in the treatment thereof in order to obtain the desired results.

Having thus described my invention, what I claim is 1. The process of treating leather consisting in subjecting the hide to a tanning mixture of terra a-ponica, pulverized alum and water.

2. The process of treating leather consisting in subjecting the hide to a tanning mixture composed of terra japonica 1 pounds, pulverized alum pound, and a quantity of water and leaving the hide therein for a number of days, the hide being removed from the mixture for airing purposes from time to time.

In testimony whereof I aflix my signature.

his HUGH YOUNG.

mark