EP0575632B1 - Process for tanning fish skins - Google Patents
Process for tanning fish skins Download PDFInfo
- Publication number
- EP0575632B1 EP0575632B1 EP92108180A EP92108180A EP0575632B1 EP 0575632 B1 EP0575632 B1 EP 0575632B1 EP 92108180 A EP92108180 A EP 92108180A EP 92108180 A EP92108180 A EP 92108180A EP 0575632 B1 EP0575632 B1 EP 0575632B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- water
- weight
- rpm
- tanning
- add
- 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
Links
- 241000251468 Actinopterygii Species 0.000 title claims abstract description 10
- 238000000034 method Methods 0.000 title claims description 27
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 66
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims abstract description 28
- 239000003925 fat Substances 0.000 claims abstract description 16
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims abstract description 12
- GRWVQDDAKZFPFI-UHFFFAOYSA-H chromium(III) sulfate Chemical compound [Cr+3].[Cr+3].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O GRWVQDDAKZFPFI-UHFFFAOYSA-H 0.000 claims abstract description 9
- 150000003839 salts Chemical class 0.000 claims abstract description 7
- 239000000417 fungicide Substances 0.000 claims abstract description 6
- 239000003619 algicide Substances 0.000 claims abstract description 5
- 230000000855 fungicidal effect Effects 0.000 claims abstract description 5
- 239000000344 soap Substances 0.000 claims abstract description 5
- WGLPBDUCMAPZCE-UHFFFAOYSA-N Trioxochromium Chemical compound O=[Cr](=O)=O WGLPBDUCMAPZCE-UHFFFAOYSA-N 0.000 claims abstract description 4
- 229910000423 chromium oxide Inorganic materials 0.000 claims abstract description 4
- 230000003472 neutralizing effect Effects 0.000 claims abstract description 3
- 239000003795 chemical substances by application Substances 0.000 claims description 9
- 238000005554 pickling Methods 0.000 claims 3
- 230000035484 reaction time Effects 0.000 claims 2
- 239000000203 mixture Substances 0.000 claims 1
- 239000007788 liquid Substances 0.000 abstract description 8
- 229910052804 chromium Inorganic materials 0.000 abstract description 7
- 239000011651 chromium Substances 0.000 abstract description 7
- 235000018553 tannin Nutrition 0.000 abstract description 5
- 229920001864 tannin Polymers 0.000 abstract description 5
- 239000001648 tannin Substances 0.000 abstract description 5
- 239000000843 powder Substances 0.000 abstract description 3
- 229930195733 hydrocarbon Natural products 0.000 abstract description 2
- 150000002430 hydrocarbons Chemical class 0.000 abstract description 2
- 239000001117 sulphuric acid Substances 0.000 abstract description 2
- 235000011149 sulphuric acid Nutrition 0.000 abstract 1
- 208000012886 Vertigo Diseases 0.000 description 10
- LLEMOWNGBBNAJR-UHFFFAOYSA-N biphenyl-2-ol Chemical compound OC1=CC=CC=C1C1=CC=CC=C1 LLEMOWNGBBNAJR-UHFFFAOYSA-N 0.000 description 4
- 229960002836 biphenylol Drugs 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 239000002351 wastewater Substances 0.000 description 4
- 239000010985 leather Substances 0.000 description 3
- 241001136792 Alle Species 0.000 description 2
- 241000283690 Bos taurus Species 0.000 description 1
- 241000283707 Capra Species 0.000 description 1
- 241000270322 Lepidosauria Species 0.000 description 1
- 230000002421 anti-septic effect Effects 0.000 description 1
- 229940064004 antiseptic throat preparations Drugs 0.000 description 1
- 235000015278 beef Nutrition 0.000 description 1
- 230000000536 complexating effect Effects 0.000 description 1
- 238000004043 dyeing Methods 0.000 description 1
- 238000006386 neutralization reaction Methods 0.000 description 1
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
-
- 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 invention relates to a method for tanning fish skins according to the preamble of patent claim 1.
- a method for tanning fish skins is known from WO-A-8 43 718.
- the invention has for its object to provide a tanning process in which the chromium residues in the waste water are reduced.
- the leather is now finished using the usual technique. They need to be colored and trimmed.
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Treatment And Processing Of Natural Fur Or Leather (AREA)
- Detergent Compositions (AREA)
Abstract
Description
Die Erfindung betrifft ein Verfahren zur Gerbung von Fischhäuten gemäß dem Oberbegriff des Patentanspruchs 1.The invention relates to a method for tanning fish skins according to the preamble of patent claim 1.
Ein Verfahren zur Gerbung von Fischhäuten ist aus der WO-A-8 43 718 bekannt.A method for tanning fish skins is known from WO-A-8 43 718.
Die Firmendruckschriften: "Baychrom C-Verfahren: Chromgerbung mit hoher Flottenauszehrung" und "Baychrom C-Verfahren: Chromgerbung und Chromnachgerbung mit hoher Flottenauszehrung" betreffen Chromgerbungsverfahren für Rindblößen.The company publications: "Baychrom C process: chrome tanning with high liquor consumption" and "Baychrom C process: chrome tanning and chrome retanning with high liquor consumption" relate to chrome tanning processes for beef.
Bisher bekannte Gerbverfahren für Fischhäute haben den Nachteil, daß das Abwasser mit hohen Chromrückständen aus dem Chromgerbschritt belastet ist.Previously known tanning processes for fish skins have the disadvantage that the waste water is contaminated with high chrome residues from the chrome tanning step.
Demgegenüber liegt der Erfindung die Aufgabe zugrunde, ein Gerbverfahren zu schaffen, bei dem die Chromrückstände im Abwasser verringert sind.In contrast, the invention has for its object to provide a tanning process in which the chromium residues in the waste water are reduced.
Diese Aufgabe wird durch die Merkmale des Patentanspruchs 1 gelöst.This object is achieved by the features of patent claim 1.
Um von Fischhäuten Leder herzustellen, gehe man folgendermaßen vor:
- A, Den Fisch maschinell oder von Hand abziehen und die Haut wiegen.
- B, Die Häute mit reichlich Salz in Kisten oder andere Behälter füllen.
- C, Die Häute so abgezogen und konserviert in Gerbefässer füllen, und fließendes Wasser einlassen. Die Wassermenge kann variieren zwischen 50% und 90% vom Gewicht der Häute. Empfehlenswert sind 90 % Wasser. Dann fügt man eine biologisch abbaubare Seife hinzu. Der prozentuelle Anteil kann zwischen 0,5 % und 5 % liegen. Wir empfehlen 1 % Baymol® A von Bayer. Nun kann das Faß bei einer Umdrehungszahl von 0,5 bis zu 5 Umdrehungen pro Minute in Rotation gesetzt werden, empfehlenswert ist 1 Umdrehung pro Minute. Die Zeit der Rotation kann zwischen 1 Std. und 2 Std. liegen, empfehlenswert ist 1Std. 10 Min.
- D, Wasser ablassen!
- E, Fließendes Wasser einfüllen. Die Wassermenge liegt zwischen 30 % und 150 % vom Ausganosgewicht der Häute, wir empfehlen 70 % Wasser. Dann geben wir die Menge Salz zu, daß BE (Beaumé) 7/7,5 Grade entstehen. Das Gerbefaß in Bewegung setzen bei 1 Umdrehung pro Minute.
Während sich das Faß dreht, schüttet man durch die Eingießöffnung in Wasser verdünnte Schwefelsäure, im Verhältnis 1 zu 20 zu, und zwar 0,8 % vom Gewicht der Häute, auf jeden Fall soviel, daß der PH-Wert 2,8 erreicht. Die Zeit der Rotation hängt davon ab, bis der oben genannte PH-Wert erreicht ist. Sie ist variabel zwischen 1 Std. und 1 1/2 Std. Erinnern wir uns daran, daß die Umdrehungszahl bei 1 Umdrehung pro Minute liegt. - F, Nachdem dieser PH Wert erreicht ist, fahren wir mit dem Chromprozess fort. Das verwendete Chrom wird von der Haut fast vollkommen aufgenommen, deshalb ist der Prozess extrem ökologisch, im Vergleich zu jeder anderen Technologie. Jede andere Chromgerbung, die für Rind- Ziege- oder Reptilleder, oder irgend ein anderes patentiertes Verfahren zur Gerbung von Fischhaut, läßt einen ungenutzten Rest von mindestens 30 % (dreißig) Chromgerbemitteln im Abwasser zurück, während bei unserem Verfahren nur 2 % (zwei) Chromrückstände im Abwasser verbleiben. Es ist offensichtlich, welcher enorme Fortschritt durch unsere Technologie garantiert wird. Das Haus Bayer Leverkusen, nennt diesen Chromgerbungsprozess Baychrom®C (siehe Anlage). Wir benutzen dieses Verfahren zum Gerben von Fischhäuten, vervollständigt mit weiteren Vorgängen, sowie Fungiziden/Algiziden (Antiseptiken) und Fettungsprodukten.
- F1, Wir füllen in das Gerbfaß einen Chromgerbstoff in Pulverform, auf der Basis von Chromsulfat. Der Anteil der hinzugegeben werden muß, liegt bei 1 % und 2,5 %, empfehlenswert sind 2,5 %. Wir lassen das Ganze zwischen 30 Minuten und 10 Std. drehen, empfehlenswert sind 3 Std. Die Umdrehungszahl bleibt bei 1 Umdrehung pro Minute. Wir verwenden Baychrom® A von Bayer.
- F2, Nach dieser Zeit geben wir in das Gerbfaß ein Fungizid/ Algizid, und zwar zu einem Anteil von 0,1 % und 2 %, wir verwenden 0,5 %, verdünnt mit Wasser und weiteren 2,5 % Baychrom® A. Das Fungizid das wir verwenden, heißt Preventol® CR von Bayer. Alles zusammen muß nun weitere 3 Stunden rotieren, bei einer Umdrehungszahl von 1 Umdrehung pro Minute.
- F3,Nun fügen wir einen Chromoxydhaltigen Gerbstoff von 7,2 % bei. Wir geben zwischen 1 % und 10 % dazu, empfehlenswert sind 4 %. Die Flüssigkeit bleibt mindestens 2 Std. höchstens 20 Std. im Faß, empfehlenswert sind 4 Std. Die Umdrehungen werden nun auf 3 Umdrehungen pro Minute erhöht. Das Chrom das wir verwenden heißt Baychrom® CH von Bayer.
- F4, Nun geben wir ein synthetisches Fett in das Faß. Die Menge liegt zwischen 1 % und 15%, empfehlenswert sind 5 %. Wir empfehlen Coripol® DX 1202 von Bayer.
- Nach 5 Minuten!
- F5, Man fügt eine Menge Wasser bei, welche zwischen 10 % und 300 % liegt, empfehlenswert sind 100 % Wasser. Die Wassertemperatur sollte zwischen 25°C und 70°C liegen, wir raten 45°C. Nun erhöhen wir die Umdrehungen auf 5 bis 7 Umdrehungen pro Minute. Der Zeitraum der Rotation beträgt nunmehr 12 - 18 Stunden.
- G, Die Flüssigkeit wird abgelassen.
- H, Man fülle zwischen 50 % und 400 % Wasser ins Gerbfass, empfehlenswert sind 200 % Wasser vom Ausgangsgewicht, bei einer Temperatur, die zwischen 30°C und 80°C liegt, idealerweise 50°C. Dann geben wir einen neutralisierenden Nachgerbstoff zu, welcher die komplexierenden Bestandteile fixieren soll, das im Produkt enthaltene Chrom. Wir verwenden Blancorol® RC - (CF). Davon geben wir zwischen 1 % und 10 % bei, emofehlenswert sind 5 %, oder jedenfalls die Menge, daß nach einer Stunde der PH Wert bei 6 liegt. PH=6 In dieser Fase erhöhen wir auf 10 Umdrehungen pro Minute.
- I, Die Flüssigkeit wird abgelassen.
- L, Nun geben wir in das Gerbfaß zwischen 50 % und 500 % Wasser, empfehlenswert sind 200 % Wasser, welches eine Temperatur zwischen 30°C und 70°C haben soll, die ideale Wassertemperatur, liegt bei 50°C. Anschließend fügen wir eine Kombination von ausgewählten Naturfetten bei. Die Menge der Naturfette sollte zwischen 1 % und 30 % liegen, empfehlenswert sind 10 %.
- L, Jene werden vor dem Beimengen in Wasser aufgelöst, und zwar in dem Verhältnis 1 : 4, bei einer Wassertemperatur von 60°C. Wir verwenden Coripol® MB von Bayer. Dann fügen wir noch geradkettige Kohlenwasserstoffe bei, welche als synthetisches Fett identifiziert ist, und Chromopol® UFS (Bayer) heißt. Die beigefügte Menge liegt zwischen 1 % und 30 %, empfehlenswert sind 10 %. Alles zusammen muß sich zwischen 30 Minuten und 3 Stunden drehen. Empfehlenswert sind 2 Stunden.
- A, Peel off the fish mechanically or by hand and weigh the skin.
- B, Put the skins in boxes or other containers with plenty of salt.
- C, The skins removed and preserved in tanning vials, and let in running water. The amount of water can vary between 50% and 90% of the weight of the skins. 90% water is recommended. Then you add a biodegradable soap. The percentage can be between 0.5% and 5%. We recommend 1% Baymol® A from Bayer. Now the drum can be rotated at a speed of 0.5 to 5 revolutions per minute, 1 revolution per minute is recommended. The time of rotation can be between 1 hour and 2 hours, 1 hour is recommended. 10 min.
- D, drain water!
- E, pour running water. The amount of water is between 30% and 150% of the total weight of the skins, we recommend 70% water. Then we add the amount of salt to make B E (Beaumé) 7 / 7.5 degrees. Start the tanning drum at 1 revolution per minute.
While the barrel is rotating, sulfuric acid diluted in water in a ratio of 1 to 20 is poured in through the pouring opening, namely 0.8% of the weight of the skins, in any case so much that the pH value reaches 2.8. The time of rotation depends on until the above-mentioned pH value is reached. It is variable between 1 hour and 1 1/2 hours. Let us remember that the number of revolutions is 1 revolution per minute. - Q, After this pH is reached, we continue with the chrome process. The chromium used is almost completely absorbed by the skin, which is why the process is extremely ecological compared to any other technology. Any other chrome tanning process for cow, goat or reptile leather, or any other patented process for tanning fish skin, leaves an unused residue of at least 30% (thirty) chromium tanning agents in the wastewater, whereas in our process only 2% (two) Chromium residues remain in the waste water. It is obvious what enormous progress our technology guarantees. Bayer Leverkusen calls this chrome tanning process Baychrom®C (see attachment). We use this process for tanning fish skins, completed with further processes, as well as fungicides / algicides (antiseptics) and fat products.
- F 1 , We fill the tanning barrel with a chrome tanning agent in powder form, based on chromium sulfate. The percentage that has to be added is 1% and 2.5%, 2.5% is recommended. We let the whole thing spin between 30 minutes and 10 hours, 3 hours is recommended. The number of revolutions remains at 1 revolution per minute. We use Baychrom® A from Bayer.
- F 2 , After this time, we add a fungicide / algicide to the tanning drum, in a proportion of 0.1% and 2%, we use 0.5%, diluted with water and another 2.5% Baychrom® A. The fungicide we use is called Preventol® CR from Bayer. All of this must now rotate for a further 3 hours at a speed of 1 revolution per minute.
- F 3 , Now we add a chromium oxide-containing tannin of 7.2%. We add between 1% and 10%, 4% is recommended. The liquid remains in the barrel for at least 2 hours, at most 20 hours, 4 hours is recommended. The revolutions are now increased to 3 revolutions per minute. The chrome we use is called Baychrom® CH from Bayer.
- F 4 , Now we put a synthetic fat in the barrel. The amount is between 1% and 15%, 5% is recommended. We recommend Coripol® DX 1202 from Bayer.
- After 5 minutes!
- F 5 , A lot of water is added, which is between 10% and 300%, 100% water is recommended. The water temperature should be between 25 ° C and 70 ° C, we recommend 45 ° C. Now we increase the revolutions to 5 to 7 revolutions per minute. The period of rotation is now 12-18 hours.
- G, the liquid is drained.
- H, Put between 50% and 400% water in the tanning drum, 200% water of the original weight is recommended, at a temperature between 30 ° C and 80 ° C, ideally 50 ° C. Then we add a neutralizing retanning agent, which is supposed to fix the complexing components, the chromium contained in the product. We use Blancorol® RC - (CF). We add between 1% and 10%, 5% is recommended, or in any case the amount that after one hour the pH value is 6. PH = 6 In this phase we increase to 10 revolutions per minute.
- I, the liquid is drained.
- L, Now we put in the tanning barrel between 50% and 500% water, we recommend 200% water, which should have a temperature between 30 ° C and 70 ° C, the ideal water temperature is 50 ° C. Then we add a combination of selected natural fats. The amount of natural fats should be between 1% and 30%, 10% is recommended.
- L, those are dissolved in water before mixing, in a ratio of 1: 4, at a water temperature of 60 ° C. We use Coripol® MB from Bayer. Then we add straight-chain hydrocarbons, which is identified as synthetic fat, and is called Chromopol® UFS (Bayer). The amount added is between 1% and 30%, 10% is recommended. Everything must turn between 30 minutes and 3 hours. 2 hours is recommended.
Die Fertigstellung der Leder erfolgt nun nach der üblichen Technik. Sie mussen gefärbt werden und zugerichtet.The leather is now finished using the usual technique. They need to be colored and trimmed.
- Häute
- 90 % Fließendes Wasser
- 1 % Baymol A
- 1 Std. 10 Min. im Faß Drehen, bei 1 Umdrehung Pro Minute
- Skins
- 90% running water
- 1% Baymol A
- 1 hour 10 minutes in the barrel, at 1 revolution per minute
- 70 % H2O70% H 2 O
- 10 % oder andere % Salz, bis zu BE(Beaumé) 7/7,510% or other% salt, up to B E (Beaumé) 7 / 7.5
- 0,8 % Schwefelsäure0.8% sulfuric acid
- 1 Std. 10 Min. im Faß drehen, bei 1 Umdrehung pro MinuteTurn the barrel for 1 hour 10 minutes at 1 revolution per minute
- 2,5 % Baychrom A
- 3 Std. Drehen, bei 1 Umdrehung pro Minute
- 0,2 % Preventol CR
- 2,5 % Baychrom A
- 3 Std. drehen, bei 1 Umdrehung pro Minute
- 4 % Baychrom CH
- 4 Std. drehen , bei 3 Umdrehungen pro Minute
- 5 % Coripol DX 1202
- 5 Minuten drehen, bei 3 Umdrehungen pro Minute
- 100 % H2O bei 45°C, 12 bis 18 Std Drehen, bei 5 Umdrehungen/Min.
- 2.5% Bay Chromium A
- 3 hours of rotation, at 1 revolution per minute
- 0.2% Preventol CR
- 2.5% Bay Chromium A
- Turn for 3 hours at 1 revolution per minute
- 4% Baychrom CH
- Rotate for 4 hours at 3 revolutions per minute
- 5% Coripol DX 1202
- Turn 5 minutes at 3 revolutions per minute
- 100% H 2 O at 45 ° C, turning for 12 to 18 hours, at 5 turns / min.
- 200 % H2O bei 50°C
- 5 % Blancorol RC (CF)
- Im Faß drehen, bei 10 Umdrehungen pro Minuten
- 200% H 2 O at 50 ° C
- 5% Blancorol RC (CF)
- Turn in the barrel, at 10 revolutions per minute
- 200 % H2O bei 50°C
- 10 % Coripol MB
- 10 % Chromopol UFS
- 2 Std drehen im Faß, bei 10 Umdrehungen pro Minute
- 200% H 2 O at 50 ° C
- 10% Coripol MB
- 10% Chromopol UFS
- 2 hours in the barrel, at 10 revolutions per minute
Claims (8)
- Process for tanning fish skins comprising the steps:- pretreatment of the stripped and preserved skins with a mixture of water and soap,- pickling of the pretreated skins with water and salt until a BE value of 7 - 7.5 is reached and subsequent addition of diluted sulfuric acid until a pH value of 2.8 is reached,- chrome tanning of the skins by addition of a chrome tanning agent,- retanning of the skins with a neutralizing retanning agent and- greasing of the skins with natural fats and/or synthetic fats,characterized by a chrome tanning comprising the following steps:- a1) addition of 1 - 2.5 % by weight (in relation to the weight of the skins) of chromium sulfate;- a2) rotating the tanning drum for between 0.5 - 10 h at 1 rpm;- b1) addition of 0.1 - 2 % by weight of fungicide/algicide and 2 - 3 % by weight chromium sulfate;- b2) rotating the tanning drum for a further 2 - 5 h;- c1) adding 1 - 10 % by weight of tanning agent containing chromium oxide;- c2) rotating the tanning drum for between 2 to 20 h at 3 rpm;- d1) adding 1 - 15 % by weight of a synthetic fat and- d2) rotating the tanning drum for a further 2 - 15 min.
- A process according to Claim 1, characterized bye) the subsequent addition of 10 - 300 % by weight of water having a temperature between 25 and 70 °C andf) rotating the tanning drum for 12 - 18 h at 5 - 7 rpm.
- A process according to Claim 2, characterized in that 2.5 % by weight of chromium sulfate with a reaction time of 3 h in step a), 0.5 % by weight fungicide/algicide and 2.5 % chromium sulfate in step b), 4 % by weight tanning agent containing chromium oxide with a reaction time of 4 h in step c), 5 % by weight synthetic fat in step d) and 100 % by weight of water with a temperature of 45 °C in step e) are added.
- A process according to one of the preceding claims, characterized in that, in the pretreatment step, 50 - 90 % by weight of water and 0.5 - 5 % by weight of soap are added and the tanning drum is rotated for 1 - 2 h at 0.5 - 5 rpm.
- A process according to one of the preceding claims, characterized in that, in the pickling step, the water contained in the tanning drum is drained and subsequently 30 - 150 % by weight of water and salt are added until the BE value between 7 - 7.5 BE is reached, subsequently diluted sulfuric acid is added and the tanning drum is rotated for 1 - 1.5 h at 1 rpm until a pH value of 2.8 is reached.
- A process according to one of the preceding claims, characterized in that, in the retanning step, first the water is drained, subsequently 50 to 400 % by weight of water having a temperature of 30 - 80 °C and 1 - 10 % by weight of the retanning agent are added until a pH value of 6 is reached with the tanning drum being rotated at 10 rpm.
- A process according to one of the preceding claims, characterized in that, during the greasing of the skins, first the water is drained and then 50 - 500 % by weight of water having a temperature of 30 - 70 °C, 1 - 30 % by weight of natural fats, which are dissolved in 50 - 80 °C water, and 1 - 30 % by weight of synthetic fat are added and the tanning drum is rotated for 0.5 - 3 h.
- A process according to Claims 4 to 7, characterized in that, in the pretreatment step, 90 % by weight of water and 1 % by weight of soap are added and the tanning drum is rotated for 1 h 10 min at 1 rpm, that during the pickling step 70 % by weight of water and 0.8 % by weight of sulfuric acid, which is diluted at a ratio of 1:20, are added, that during the retanning 200 % by weight of water at 50 °C and 5 % retanning agent are added and that during the greasing 200 % by weight of water with 50 °C and 10 % natural fats, which were priorly dissolved in 60 °C water in a ratio of 1:4, and also 10 % by weight of synthetic fat are added and the tanning drum is rotated for 2 h.
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DK92108180.8T DK0575632T3 (en) | 1992-06-25 | 1992-06-25 | |
DE59207060T DE59207060D1 (en) | 1992-06-25 | 1992-06-25 | Process for tanning fish hides |
ES92108180T ES2094844T3 (en) | 1992-06-25 | 1992-06-25 | PROCEDURE TO TREAT FISH SKINS. |
EP92108180A EP0575632B1 (en) | 1992-06-25 | 1992-06-25 | Process for tanning fish skins |
AT92108180T ATE142279T1 (en) | 1992-06-25 | 1992-06-25 | METHOD FOR TANNING FISH SKINS |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP92108180A EP0575632B1 (en) | 1992-06-25 | 1992-06-25 | Process for tanning fish skins |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0575632A1 EP0575632A1 (en) | 1993-12-29 |
EP0575632B1 true EP0575632B1 (en) | 1996-09-04 |
Family
ID=8209615
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP92108180A Expired - Lifetime EP0575632B1 (en) | 1992-06-25 | 1992-06-25 | Process for tanning fish skins |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP0575632B1 (en) |
AT (1) | ATE142279T1 (en) |
DE (1) | DE59207060D1 (en) |
DK (1) | DK0575632T3 (en) |
ES (1) | ES2094844T3 (en) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN1044820C (en) * | 1996-03-08 | 1999-08-25 | 徐国士 | Fish skin nontoxic tanning technology |
CN103436643B (en) * | 2013-06-07 | 2015-06-24 | 武汉工程大学 | Environment-friendly leather-producing process by using sturgeon skins |
FR3083805B1 (en) | 2018-07-12 | 2020-07-24 | Jean Marc Casteigt | PROCESS FOR TANNING A SMOKED SALMON SKIN AND TANNED SMOKED SALMON SKIN |
RU2704442C1 (en) * | 2018-09-11 | 2019-10-28 | Федеральное государственное бюджетное образовательное учреждение высшего образования "Воронежский государственный университет инженерных технологий" (ФГБОУ ВО "ВГУИТ") | Method for production of leather semi-product of all types of freshwater fish |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1984003718A1 (en) * | 1983-03-25 | 1984-09-27 | Suner Rego Norberto Omar | Process for tanning fish skins |
DE3534353A1 (en) * | 1985-09-26 | 1987-04-02 | Beck Bernardo Von | METHOD FOR PRODUCING FISH LEATHER |
IT1190229B (en) * | 1986-03-07 | 1988-02-16 | Pellitt Srl | FISH SKIN TANNING PROCEDURE |
-
1992
- 1992-06-25 ES ES92108180T patent/ES2094844T3/en not_active Expired - Lifetime
- 1992-06-25 DK DK92108180.8T patent/DK0575632T3/da active
- 1992-06-25 DE DE59207060T patent/DE59207060D1/en not_active Expired - Fee Related
- 1992-06-25 EP EP92108180A patent/EP0575632B1/en not_active Expired - Lifetime
- 1992-06-25 AT AT92108180T patent/ATE142279T1/en not_active IP Right Cessation
Non-Patent Citations (2)
Title |
---|
Prospekt der Firma Bayer: "Baychrom C-Verfahren: Chromgerbung mit hoher Flottenauszehrung". * |
Prospekt der Firma Bayer: "Baychrom C-Verfahren: Chromgerbung und Chromnachgerbung mit hoher Flottenauszehrung". * |
Also Published As
Publication number | Publication date |
---|---|
ES2094844T3 (en) | 1997-02-01 |
DK0575632T3 (en) | 1997-02-24 |
DE59207060D1 (en) | 1996-10-10 |
ATE142279T1 (en) | 1996-09-15 |
EP0575632A1 (en) | 1993-12-29 |
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