EP0138808A1 - Procede de tannage de peaux de poissons - Google Patents

Procede de tannage de peaux de poissons

Info

Publication number
EP0138808A1
EP0138808A1 EP83901649A EP83901649A EP0138808A1 EP 0138808 A1 EP0138808 A1 EP 0138808A1 EP 83901649 A EP83901649 A EP 83901649A EP 83901649 A EP83901649 A EP 83901649A EP 0138808 A1 EP0138808 A1 EP 0138808A1
Authority
EP
European Patent Office
Prior art keywords
skins
tanning
fish
process according
salt
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.)
Withdrawn
Application number
EP83901649A
Other languages
German (de)
English (en)
Other versions
EP0138808A4 (fr
Inventor
Norberto Omar Suner-Rego
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of EP0138808A1 publication Critical patent/EP0138808A1/fr
Publication of EP0138808A4 publication Critical patent/EP0138808A4/fr
Withdrawn legal-status Critical Current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
    • C14C13/00—Manufacture of special kinds or leather, e.g. vellum

Definitions

  • the present invention relates to the tanning of fish skins.
  • Patent 2,633,730 the skins were treated with a pancreatic enzyme and then tanned with a vegetable extract, a syntan or after pickling and bleaching with a chrome tan. It is suggested that ' a combination of tannages, for example formaldehyde and chrome combinations may be used. French
  • Patent 729,942 abstracted in Chemical Abstracts volume 27 at column 439 8 described the tanning of fish skins with 1 synthetic tanning agents and then with vegetable tanning agents or a mixture of the two followed by chrome tanning.
  • a process for the production of tanned fish skins which com ⁇ prises a) contacting dry fish skins with an aqueous solution of a neutral salt said solution having a pH ad- justed into the range 1.5 to 3.5. b) subjecting said fish skins to a two step tanning operation wherein after the first stage said skins are washed at a temperature of not more than 35°C. and the second tanning step is carried out using a more ⁇ on- centrated solution then the first stage at a temperature of not less than 35°C. and c) washing the tanned skins and treating them in an aqueous bath with an anionic grease and then an oil and then with an alkali metal salt of a weak organic acid followed by an alkali to raise the pH to at least 6.
  • Fish for use in the present invention are those which do not have scales with a diameter of more than one inch which overlap to prevent penetration by the treating chemicals.
  • the process of the invention can be used for the treatment of shark skin, it finds more parti ⁇ cular use in the treatment of skins which have not hitherto 5 been treatable to produce high quality products, namely those of the teleost fishes.
  • Suitable fish skins for treat ⁇ ment in the process of the present invention include those of the order Apodes (eels) and Percomorphi. More parti ⁇ cularly of use on fish of the suborders Percoidea (such as 0 croakers) , Scombroidea (such as tuna and marlin) and
  • Ophidioidea such as cush eels
  • Other useful fish include: bonito, blackfish, grouper, redfish, swordfish, etc.
  • the fish skins may be dried in any convenient way.
  • One use- 5 ful drying technique is to place raw fish skins on trays and cover them with common salt for a period of many hours, for example 24 hours and then hang the skins for completion of the drying.
  • the skins may be immersed in a strong solution of common salt for say 10 to 18 hours * 0 and then hung for drying.
  • Another possibility is simply to expose the skins to fresh air or to keep them in a warm environment (but keeping the temperature below 30°C).
  • the skins are treated with an aqueous solution 5 of a neutral salt such as sodium sulfate or sodium chloride at ambient temperature.
  • the solution used has its pH adjusted into the range 1.5 to 3.5 by addition of the necessary amount of acid before being contacted with the fish skins.
  • Any suitable acid may be employed. However, 0 the use of an organic acid is normally to be preferred since it minimizes the risk of swelling of the skins. How ⁇ ever, if desired, one may employ an inorganic acid and if necessary a retarder to control swelling.
  • formic acid to be particularly useful, for example in an amount of 0.05 to 0.5 percent by volume depending upon the exact native of the salt employed.
  • the salt solution itself is of a concentration of from
  • OMPI "100 to 250 grams per liter. I have often found it con ⁇ venient to use from 2 to 6 liters of aqueous salt solu ⁇ tion per kilogram of fish skins. Typically, the skins are contacted with the aqueous salt solution for from 8 to 20 hours during which time a rise in pH may occur. The final pH should be in the range 2 to 4. In this stage, any scales on the fish are removable.
  • a combination of a chromic salt such as chromic sulfate and a syntan for example those based on phenol sulfone condensation products.
  • a syntan tanning agent may be employed, however, in ⁇ cluding formaldehyde condensates with aromatic sulfonates such as naphthalene sulfonates and phenol sulfonates. Indeed in suitable cases tanning may be carried out using only a chromic salt or only a phenolic tanning agent.
  • the actual tanning operation is carried out in two steps.
  • the skins are typically con ⁇ tacted with the tanning solution at ambient temperature for a period of from 15 to 36 hours.
  • a concentration of 0.018 to 0.032 grams per liter will normally be employ ⁇ ed.
  • This combination of chromic sulphate and a syntan agent comes previously combined by a different chemical companies, under several names and marks so that is not necessary to mix separate ingredients during our process.
  • the skins are washed with water at a temperature of no more than 35°C, often typically no more than 30°C. So far as I am aware, there has been no previous suggestion to use a combination of a chromic salt and a syntan for the tanning of fish skins.
  • the second tanning step is desirably carried out with the same tanning agent as is used in the first of these steps. It is, however, employed at a higher con ⁇ centration and the initial temperature of the bath used is at least 35°C, often typically at least 50°C. During the second stage, the temperature is normally held in the range 40 to 50°C. When using a combination, a chromic salt and a syntan in this stage, the concentration of the chromic salt and syntan is typically in the range 0.050 to 0.090 grams/liters.
  • the skins are treated in this stage for a period of from 2 to 4 hours.
  • synthetic resins such as acrylics, phenolics and aromatics
  • aniline dyes at a concentration of 0.030 to 0.070 grams -of aniline in an aqueous bath at a tempera ⁇ ture above about 30°C. when used in the presence of a dilute acid, for example 3 to 6 percent formic acid to be particularly useful for this purpose.
  • the final portion of my process involves treat- ment of the skins in an aqueous bath at a temperature above 30°C, for example 35 to 40°C. Typically from 1 to 3.5 liters of water are used per kilogram of skins.
  • the bath used for the dyeing stage may be employed.
  • an anionic greasing agent such as a sulfated or sulfited grease
  • an alkali metal salt of an organic acid normally a weak acid such as formic acid, for example sodium formate.
  • this salt is added in an amount of 0.003 to 0.006 grams per kilogram of fish skins. If desired, the treatment with the salt may be repeated after 5 to 10. minutes. Finally, an alkaline material such as sodium bicarbonate should be added to the bath to act as a pH modifier gradually to raise the pH to above about 6 typi ⁇ cally 6.5 to 7. I have found it useful to add such an alkali in three batches, each separated by about 5 to 15 minutes, typically adding from 0.003 to 0.006 grams of sodium bicarbonate per kilogram of fish skins in each batch.
  • the skins should remain in a bath of tap water for 15 to 40 minutes and then removed and dried.
  • This formula is for tanning each 1.000 grams of raw skin.
  • PHASE I Three liters of tap water b) 0.200 grams of common salt or sodium sulphate c) 7-8.5 cc of formic acid at 85% concentration, or any other organic or inorganic acid d) Formic acid must be dissolved in a 1 by 10 proportion with water e) The combination of all elements before putting the raw skins in, must have a pH from 2.5 to a maximum of 3 f) Leave the skins to rest in the solution 15 hours. The pH must result from a minimum of 3 to a maximum of 3.5 -7-
  • PHASE III Three liters- of tap water b) 0.025 grams of TANESCO H (or a combination of chromium salt and condensed sulphonic aromatic acid) per each liter of water c) Leave skins to rest 45 hours in the bath d) Afterwards the skins must be washed in motion water be ⁇ tween 30 to 35 minutes, at a temperature of 35 Celcius degrees PHASE IV a) Two liters of tap water at 35 Celcius degrees b) 0.070 grams of TANESCO H c) Leave skins for 4 hours on a motion bath d) Wash skins in tap water no more than 30 minutes PHASE V a) Two liters of tap water at 40 Celcius degrees b) 0.100 grams of INVASOL 8100 (or other anionic greased agent or any kind of sulphate or sulphited grease) c)
  • This formula is for tanning each 1.000 grams of Genypterus raw skin.
  • PHASE I a) Three liters of -tap water b) 0.180 grams of common salt or sodium sulphate c) 7-8 cc of formic acid at 85% concentration, or any other organic or inorganic acid d) Formic acid must be dissolved in a 1 by 10 proportion with water e) The combination of all elements before putting the raw skins in, must have a pH of 2.5 f) Leave the skins to rest in the solution 15 hours. The pH must result 3
  • PHASE II Three-liters of tap water b) 0.025 grams of TANESCO H (or a combination of chromium salt and condensed sulphonic aromatic acid) per each liter of tap water c) Leave skins to rest 36 hours in the bath d) Afterwards the skins must be washed in tap water, be ⁇ tween 15 and 20 minutes, at a temperature of 30 Celcius degrees PHASE III a) Two liters of tap water at 50 Celcius degrees b) 0.070 grams of TANESCO H c) Leave skins for 3 hours on a motion bath d) Wash skins in tap water for 15 to 20 minutes PHASE IV a) Two liters of tap water at 35 Celcius degrees b) 0.0100 grams of INVASOL 8100 (or other anionic greased agent or any kind of sulphated or sulphited grease) c) 0.012 grams of INVASOL VR-12 (or other natural or synthetic oil without chemical alterations) .
  • the fish skins tanned in accordance with these examples may be finished in the same manner as is used in existing leather finishing processes.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Treatment And Processing Of Natural Fur Or Leather (AREA)
  • Meat, Egg Or Seafood Products (AREA)
  • Fish Paste Products (AREA)

Abstract

Il est possible d'obtenir des peaux de poissons tannées de bonne qualité a) en mettant en contact des peaux de poissons sèches avec une solution aqueuse d'un sel neutre, le pH de ladite solution étant ajusté entre 1,5 et 3,5, b) en soumettant lesdites peaux de poissons à une opération de tannage en deux étapes, où, après ladite première étape de tannage, lesdites peaux sont lavées à une température n'excédant pas 35oC et où la seconde étape de tannage est exécutée en utilisant une solution plus concentrée que celle de la première étape de tannage à une température qui n'est pas inférieure à 35oC, et c) en lavant les peaux tannées et en les traitant dans un bain aqueux avec une graisse anionique, puis une huile, puis un sel de métal alcalin d'un acide organique faible, enfin un alcali afin d'élever le pH jusqu'à 6 au moins.
EP19830901649 1983-03-25 1983-03-25 Procede de tannage de peaux de poissons. Withdrawn EP0138808A4 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/US1983/000455 WO1984003718A1 (fr) 1983-03-25 1983-03-25 Procede de tannage de peaux de poissons

Publications (2)

Publication Number Publication Date
EP0138808A1 true EP0138808A1 (fr) 1985-05-02
EP0138808A4 EP0138808A4 (fr) 1985-08-20

Family

ID=22174945

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19830901649 Withdrawn EP0138808A4 (fr) 1983-03-25 1983-03-25 Procede de tannage de peaux de poissons.

Country Status (5)

Country Link
EP (1) EP0138808A4 (fr)
JP (1) JPS60500913A (fr)
DK (1) DK87084A (fr)
NO (1) NO844676L (fr)
WO (1) WO1984003718A1 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1190229B (it) * 1986-03-07 1988-02-16 Pellitt Srl Procedimento per la concia di pelle di pesce
EP0575632B1 (fr) * 1992-06-25 1996-09-04 Josowic, Ingrid Procédé de tannage des peaux de poisson
NO300192B1 (no) * 1995-08-07 1997-04-28 Sildolje & Sildemelind Forsk Fremgangsmate for kjoling og konservering av fisk samt produkt fra fisk behandlet ifolge fremgangsmaten
ATE259885T1 (de) * 1999-04-15 2004-03-15 Alexander Dr Harsanyi Verfahren zur lederherstellung aus fischhaut

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1256974A (en) * 1912-02-19 1918-02-19 Skind Fabriken Unicum Kr Bendixen P Bendixen And Company Process of tanning fish-skins.
GB165199A (en) * 1920-03-22 1921-06-22 Eugen Knudsen An improved process for tanning fish skins
US1725629A (en) * 1926-06-03 1929-08-20 Germain Rodolphe Adrien Process for the treatment of skins of animals containing calcified formations
GB278885A (en) * 1926-10-14 1927-10-20 Alfred Ehrenreich Improvements in and relating to processes for tanning shark skins and the products resulting therefrom
GB284197A (en) * 1927-01-24 1928-02-09 Alfred Ehrenreich Improvements in and relating to processes for the treatment of the skins of sharks and other fish of the same kind
FR729942A (fr) * 1931-03-26 1932-08-03 Tanneries Parisiennes Des Peau Procédé de tannage végétal, semi-chromé ou chromé de peaux de poissons de tousgenres
US2700590A (en) * 1950-02-15 1955-01-25 Pacific Lab Inc Process for preparing leather from teleost fishskins
US2633730A (en) * 1951-02-02 1953-04-07 Rose Henry Process of finishing fish skins

Also Published As

Publication number Publication date
JPS60500913A (ja) 1985-06-20
EP0138808A4 (fr) 1985-08-20
DK87084D0 (da) 1984-02-22
WO1984003718A1 (fr) 1984-09-27
DK87084A (da) 1984-11-08
NO844676L (no) 1984-11-23

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