US1256974A - Process of tanning fish-skins. - Google Patents

Description

no STATES r-Arnn'r orrion KRISTIAN BENDIXEN, F COPENHAGEN, DENMARK, ASSIGNOR TO KRISTIAN BENDIXEN AND PETER BENDIXEN, COPARTNERS TRADING UNDER THE FIRM-NAME 0F SKIND- FABRIKEN UNICUM, KR. BENDIXEN, 1?. BENDIXEN AND COMPANY, OF COPENHAGEN,

DENMARK.

PROCESS OF TANNING FISI-LSKINS.

Patented Feb; 19, 1918.

Specification of Letters Patent.

No Drawing: Original application filed February 19,1912, Serial No. 678,473. Divided and this application filed May "7, 1917. Seria1-No..167 ,154.

all whom it may concern:

To v dung and kilogram Be it known that I, KRISTIAN BENDIXEN, chemical hating compound heated to a temsubject of the King of Denmark, and residperature of about 18 C.

' ing at Copenhagen, Denmark, have invented After hating the skins are first washed m a new and Improved Process of Tanning clean lukewarm water and then in a solution Fish-Skins, of which the following specifiof 3 liter of hydrochloric acid and 200 liters cation is a full disclosure. 7 of water.

This application is a division of my 00- The skins are then put mto a vat contampending case No. 678473 filed February 19, mg a mild dilute solution of conventional 1912 and the invention thereof relates to a tanning material (about 5 or 6 barkomprocess for tanning fish skins and the like, eter) towhich liquid a suitable tanning which process is particularly suitable for the material is added every third day until the skins of sharks, porpoises, whales, etc., as it skins are thoroughly tanned. v renders it'possible to utilize and work up As an alternative, after treatment inthe such skins and thereby render them availhydrochloric solution, the skins may e able as leather. laced in a mill with about 4: kilograms T he process is as follows of salt and 40 liters of water, and milled for The salted skins or hides are soaked in about 10 minutes and then treated with three twice daily.

water until they are rendered quite sharks; these are the slm'ns however being ment in sodium sulfid and arsenic is not abskins or hides are slaked lime, and in this solutionthey-are also fresh In the case of the skins of the stretched upon frames and dried. After this the spikes or scales are removed with a clean blunt scraper or tanners knife. The skins are next put into lukewarm water until they are rendered perfectly soft and are then worked over a beam.

tanning material; After this the skins are again milled for about 8 hours'and are then left for the night in the mill; milled again on the following day for about 2 hours, and then completely tanned.

The skins after being completely tanned are next put into a mill with pure lukewarm a ain.

They are next plunged. 'nto a depilatory. water until theyare entirely freed from-acid, and antiseptic solution of .ZOO-liters of water and are then milled for about 6 hours in a containing either a 'logram of sodium sulfid -m1ld relativel dllute solution (about 5 or or a kilogram of-white arsenic-or raw, re 6 barkometerg of sumach extract-and water. arsenic, or half a kilogram of each of these. After thisthey are colored and then smeared with oil and spread out, dried, damped and smoothed out, polished and bleached. Finally they are rubbed with one part of albumen and 10 parts of water or of skimmed milk to render the skins supple and to prepare them for coloring. They are then glazed and grained.

If the grain skins are placed for about 5 minutes in a lution of one liter of sulfuric acid and liters of water.

In this depilatory and antlseptic solution the skins are to remain for about three days, turned twice daily.

In the case of the skins of whales this treatsolutely necessary.

After the expiration of the three days, the put into a solution of 200 liters of water and a suitable quantity of left for about three days, being again turned as examples Oakwood 0r oak-bark, or extract of oakbark or various other extracts such as quebracho and extracts of gambier.

' Having now described the invention, what The skins are next put into a lime-neutralizing solution of 50 liters of water and '5- liter of hydrochloric acid of the requisite strength and are agitated-for about 5 mmutes in this solution to dissolve and remove as much as possible of such lime as would I claim and desire to secure, 1s

otherwise remain in the pores and interfere 1,. A processfor tanning fish skins and the with the pliability of the ultimate product 3 like consistihg in softening the skins, treatand are then bated in a bating mill containing them for about three days in a solution ing 100'liters of water, '5, bucket of poultry of products produced by chemical action beof any preferred solutions of graduated strength of chrome As tanning agents the following are given I does not come outclearly, the 7 tween water and arsenic-and sodium sulfid, such treatments, agitating the hides for a and then treating them for a further period short while in a solution of Water and hydroof about three days ina solution of water chloric acid, then bating them in a mill conand slaked lime. taining water, poultry dung and a chemical 2. A. process for tanning fish skins and the bating compound, and then washing them in a like consisting in softening the skins, treatpure lukewarm water andafterward with a ing them for about three days in a solution solution of hydrochloric acid and Water. produced by the chemical action vbetween 6. A process for tanning fish skins and the sodium sulfid Water and arsenic, then treatlike consist ng in softening the skins, treatmg them for a further period of about three mg them in a solution produced by the days in a-solution of Water and slaked lime, chemical action between sodium sulfid, Water turning the hides during such treatments, an arsenic, then depilating them, then bat and then agitating the hides in a solution of ing them and then milling with a suitable water and hydrochloric acid. solution of salt to which a suitable chrome f a process for tanning fish skins and the tanningmaterial is added; themilling being 1 like consisting 1n softenmg the skins, treatt en continued until the skins are fully poultry dung and a chemical bating com- 8. A process for tanning fish skins and the ing them in a solution of products produced tanned, substantially as described. by chemical action between water and arprocess for tanning fish skins and the, sonic and sodium-suliid, then treating them like consisting in softening the skins, treatbating them in a mill containing Water hing-material is added.

them in a solution of water andarsemc, then an arsenic, then treating them for a further sodium sulfid, Water and slaked lime, turnin ing the hides in a solution of water and hythe hides during such treatments, agitating drochloric acid, then hating the hides, then the hides in a solution of Water and hydrowashing them in pure lukewarm water and chloric acid, bating them, then removin afterward with a solution of hydrochloric tiem into pure lukewarm Water, and then acid and water, then into a solution of hydrochloric acid and skins are fully tanned ina mill containing a water. I suitable solution of'salt to which a suitable 5 A process for tanning fish skins andchrome tanning material is added, then freeconsisting in softening the skins, ing the hides from acid and treating them in treating them for aboutthree days in a solua solution of extract of sumach and water. tion of products produced by chemical action he foregoing s ecification signed at 00-, between Water and arsenic andsodium sulr -penhagen,i.Denmar thisl8th day of April, fid, then treating them for a further period 917. of about three days in ,a solution ofwater and slaked lime, turning the hides during KRISTIAN BENDIXEN-