US1777836A - Treating of animal-skin products - Google Patents

Description

Patented Oct. 7, 1930 uurrsu srA'rss' ANTONIO rnnnnrrnor MILAN, man nssreuon r soom'rA mvnnzrournnnvn'rrr nuonmn 'ronmo, or roam, rrnmr Y Y Y resume or "Airman-emu rnonoo'rs in Drawing. ori inal application filed May 24, 1929, Serial no. aearso, and in mi 'm 14, me. Divided. and. this application filed l 'uly 15,1980. Serial No. 468,126.

'This invention relates to a process of treat-.

. ing animal skin materials or animal skin products, as distinguished from the treatment of wool, hair etc., and has for oneof its objects the prov sion ofa process adapted for utilizing scraps and cuttings from vegetable tanned hides whereby such materials may beconverted into a useful and valuable,

product which in appearance, fibrous texture and flexibility resembles natural leather.

It will be appreciated that my invention is of'great economical value in that it salvages' or utilizes material which heretofore generally has been converted into glues or tertilizers or simply thrown'away.

In the practice of my invention the vegetable tanned fibers of the material being treated are intimately Y admixed with an a ueous medium until athin flowing slurry o the fibers in aqueous suspension is obtained. The proportion-of a ueous medium to the material e large so as to obtain mass or slurry. Y

To this slurry Ijadd a mineraltanning agent having a chrome base such'as chromine e desired thin flowing Y or other tanning agent containing chromium,

followed .by the addition of a neutralizin agent suchas bicarbonate of. soda, borate o 80 sodium, etc., .a suitable fiber lubricant or grease such as an oil or grease which is emuln sifiable in watena 'sulfurated oil for example, a suitable binding material containing a water insoluble binder, the bindina ma-' as terial being misciblewith water prior to the coagulation of the binder. such as india rubber latex gutta percha latex, balata latex. or the liire, as o tained from the trees or lants and which may have been preserved 40 y ammonia'or any other suitable alkaline preserving material. A synthetic latex or other binding material containing: a water insoluble binder and which is in suitable condition for incorporation in the slurry may be substituted for the latices above mentioned.

I also add a preservative for the binding material, which preservative may take the form of vegetable tannin. Among the vege- 5 table tannins I preferably employ those of substantial thickness. I find also that if soinghtreate is necessarily PATENT orrics sumac.

Inasmuch as the li uid of the slurry must be abstracted in the urther practice of'my process I add to the slurry a material suc as commercial sodiumchloride, the addition of this material promoting ,the abstracting of the liquid of the slurry and beinghof material advantage in the making of s eets of the pyrogallic series, more particularly so dium chloride is added directly after the latex and before abstracting the liquid, the

process and resulting product are materially 1mXroved. Y 7

fter the above steps, the slurry is caused to flow upon a finely perforated sup ort such as a wire gauze and the liquid of t e slurry abstracted so that a sheet of fibers is obtained with the fibers disposed in felted relation. The material thus obtained is then rolled and pressed and subjected to the usual finishing operations employed in thefinish in of natural leathers.

it is to be understood that the amount 0 sodium chloride employed will vary depending upon the material being treated and also depending upon the separation or the abstracting of'the liquid of the slurry that is desired in the production of a sheet-like fibrous mass. Y

I find in the practice of my inventionthat some care must be exercised not to allow coagulation of the binder employed to pro ceed to a'detrimental'degree before abstractins; the liquid of the slurry, inasmuch as such detrimental coagulation renders further rocessi-ng and the properties of the finished product unsatisfactory. For example, when employing latex as a binding material I profor to abstract the liquid of the slurry within an hour of the addition of the binding mate-' rial to the slurry. Y

This application is a division of. my copending application Serial No. 365,780, filed Mav 24,1929.

What I claim is a 1. The process which comprises adding a tanning agent and a grease to a flowing aqueous slurry containing the fibrous portions of vegetable tanned animal skin products in suspension, adding a water insoluble binder and a preservative therefor, and abstracting the liquid of the slurry.

2. The process which comprises adding a grease, a mineral tanning agent and a neutralizing agent to a flowmg aqueous slurry containing the fibrous portlons of vegetable tanned animal skin products in "suspension, adding latex, and abstracting the liquid of the slurry.

3. The'process which comprises adding a tanning agent and a grease to a flowing aqueous slurry containing the fibrous portions of vegetable tanned animal skin products in suspension, adding a water insoluble binder, a preservative therefor and sodium chloride, and abstracting the liquid of the slurr 4. The process which comprises adiling a grease, a mineral tanning agent and a neutralizing agent to a fiowmg aqueous slurry containing the fibrous portions of vegetable tanned animal skin products in suspension, adding latex and sodium chloride to the slurry, and abstracting the liquid of the slurry.

This specification signed this 21st day of June, 1930.

ANTONIO FERRETTI.