EP1987167A1 - Process for fatliquoring leather - Google Patents
Process for fatliquoring leatherInfo
- Publication number
- EP1987167A1 EP1987167A1 EP07703213A EP07703213A EP1987167A1 EP 1987167 A1 EP1987167 A1 EP 1987167A1 EP 07703213 A EP07703213 A EP 07703213A EP 07703213 A EP07703213 A EP 07703213A EP 1987167 A1 EP1987167 A1 EP 1987167A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- skin
- fat
- leather
- oil
- carbon dioxide
- 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.)
- Granted
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
- C14C9/00—Impregnating leather for preserving, waterproofing, making resistant to heat or similar purposes
- C14C9/02—Impregnating leather for preserving, waterproofing, making resistant to heat or similar purposes using fatty or oily materials, e.g. fat liquoring
Definitions
- the invention relates to a method for the treatment of animal hides, wherein an oil, fat or polymer is applied to the skin and the skin is treated in a compressed gas.
- animal hides Animal skins, leather, skins or furs are subjected to various treatment steps in order to preserve them and to produce certain properties.
- animal hides of all kinds, in particular leather, fur and furs are generally referred to below as animal hides.
- the animal's skin is treated with water-insoluble fats for extra suppleness.
- the incorporation of the fat takes place either mechanically or by impregnation in an aqueous liquor.
- fat is added to the skin in an amount equivalent to about 30% or often 50% of the skin weight.
- the object of the present invention is to provide an improved process for the fatliquoring of animal hides.
- This object is achieved by a method of the type mentioned above, wherein the applied to the skin or on the coat amount of oil, fat or polymer less than 20%, preferably less than 15%, more preferably less than 10% by weight Skin or coat.
- an oil, fat or polymer is first applied to the animal's skin. Subsequently, the greased skin is treated in a compressed gas, in particular carbon dioxide.
- a compressed gas in particular carbon dioxide.
- the fat and oil dosage is limited to less than 15%, more preferably less than 10% of the weight of the skin to be treated.
- the fat, oil or polymer is sprayed on the animal's skin. It is particularly favorable if the skin is circulated or rotated during the spraying in order to achieve a uniform application of the fat, oil or polymer.
- the pressurization in a compressed gas is also part of the present invention possible impregnation techniques, but it is often commercially useful to use the expensive pressure vessels only for subsequent degreasing.
- the fat, oil or polymer is left for a time, e.g. 15 to 60 minutes into the skin.
- a time e.g. 15 to 60 minutes into the skin.
- the oil or polymer is massaged into the skin, on the other hand, the elastic properties of the coat or leather are improved by the mechanical processing.
- noble furs generally longer exposure times of, for example, up to one hour, preferably also with simultaneous movement of the precious furs, provided.
- animal skins of all kinds in particular leather, skins and furs, are generally referred to as animal skins.
- the invention is generally applicable to the leather sector, for example for processing or treating sheep, fox or reindeer skins or leathers.
- the method according to the invention is particularly suitable for the treatment of hides in which the hair coat is to be obtained.
- the invention brings technical, qualitative and commercial benefits.
- Essential to the invention is the subsequent treatment of the skin in a compressed gas.
- a treatment in compressed carbon dioxide at a pressure between 20 and 300 bar, preferably at a pressure between 20 and 100 bar, in particular in liquid carbon dioxide at a pressure between 20 and 70 bar has proved to be favorable.
- the treatment takes place in subcritical carbon dioxide, more preferably at a pressure of less than 70 bar and a temperature below 25 0 C instead.
- supercritical carbon dioxide can also be used as a cleaning and degreasing medium.
- Subcritical carbon dioxide has the advantage that the cleaning machines can be made simpler and cheaper than those for supercritical applications that are designed for significantly higher pressures.
- designed for the use of subcritical carbon dioxide machines are already commercially available for the chemical cleaning of textiles with carbon dioxide and must be modified only slightly for use according to the invention in the leather and fur area. Due to the lower process pressures compared to supercritical degreasing decompression can be done faster after degreasing. In this case, in particular, a sudden evaporation of carbon dioxide present in the leather or hide is avoided, which otherwise brings with it the risk of mechanical damage to the leather or fur.
- the treatment in the compressed gas serves on the one hand the even distribution of fat or oil in the animal skin, on the other hand to remove excess fat.
- Treatment of animal skin in subcritical carbon dioxide optimally fulfills both of these tasks.
- the removal of excess fat with subcritical carbon dioxide is slow, so that during washing, the fat is evenly distributed over the entire surface of the animal's skin.
- the skin, coat or leather is treated with the compressed gas in at least two, preferably three to five, successive steps.
- the greased leather is washed in a first batch with liquid carbon dioxide.
- the grease previously applied to the leather partially dissolves in the carbon dioxide.
- Part of the fat is then dumped back to untreated areas of the leather. In this way, the fat is evenly distributed over the whole leather.
- the leather is circulated in the carbon dioxide bath.
- the liquid carbon dioxide and the fat dissolved therein are drawn off, fresh carbon dioxide is supplied to the leather and a second treatment step is carried out. Often, three to five such cleaning steps make sense.
- the compressed with compressed gas in the above example, the liquid carbon dioxide, subjected to distillation in order then to be able to be transferred again in a purified state in a reservoir.
- a co-solvent for example from the group of alcohols, ketones, paraffins or esters, or another additive, including a fragrance, to effectively remove particularly stubbornly adhering substances.
- the skin is treated in the compressed gas until the weight of the skin is less than its weight before application of the oil, fat or polymer.
- Animal skin, leather or skins already contain fats naturally.
- these fats are partly washed out and replaced with the added, specifically selected fats or oils.
- the choice of these fats and oils can be made on the basis of their solubility in carbon dioxide, selecting an oil that is to remain at least partially in the leather based on its lower (compared to oils and fats naturally contained in the leather) solubility in carbon dioxide.
- the degreasing is carried out to advantage to such an extent that the hide or leather after degreasing is easier than in the untreated state before the fat was applied.
- the weight of the hide or leather after degreasing is at least 1% less than in the untreated state.
- a hand-dry mink fur has a relative weight of 100 after tanning.
- the mink fur is now greased according to the invention.
- between 5 and 15% of its weight in fats and oils is added to the mink fur.
- the total weight of the mink fur is then depending on the addition of fat between 105 and 115.
- the fur is cleaned and degreased in liquid carbon dioxide until its total weight is 93-97.
- oils, fats or polymers which are applied to the animal skin to be treated, the following substances or substance groups have proven: oxypropylated fatty alcohols and polypropylene glycol and mixtures thereof, fatty amino ethoxylates and propoxylates, polyhydroxy compounds, esters, derivatives of sugars, sorbitan esters, alkyl polyglycosides, glycerides, silicones, paraffin, polyethers and fluoro compounds.
- These substances lead to increased elasticity and tack of the leather or fur. This means a direct economic advantage for the leather or fur processor and an increased value for the end user.
- Time-consuming mechanical processing of the leather for introducing the fat can be omitted.
- the oil or fat is applied and then distributed during the treatment in the compressed gas on the leather or rock surface and, in particular when the leather or fur is circulated, incorporated into this.
Landscapes
- Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Treatment And Processing Of Natural Fur Or Leather (AREA)
- Cosmetics (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102006008190A DE102006008190A1 (en) | 2006-02-22 | 2006-02-22 | Procedure for the treatment of animal skin comprises applying oil, fat or polymer on the skin and treating the skin with a condensed gas |
PCT/EP2007/000884 WO2007096047A1 (en) | 2006-02-22 | 2007-02-01 | Process for fatliquoring leather |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1987167A1 true EP1987167A1 (en) | 2008-11-05 |
EP1987167B1 EP1987167B1 (en) | 2012-03-28 |
Family
ID=38050138
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP07703213A Not-in-force EP1987167B1 (en) | 2006-02-22 | 2007-02-01 | Process for fatliquoring leather |
Country Status (7)
Country | Link |
---|---|
EP (1) | EP1987167B1 (en) |
AT (1) | ATE551435T1 (en) |
DE (1) | DE102006008190A1 (en) |
ES (1) | ES2385667T3 (en) |
RU (1) | RU2401865C2 (en) |
UA (1) | UA91595C2 (en) |
WO (1) | WO2007096047A1 (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102009018232B8 (en) | 2009-04-21 | 2011-11-10 | Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. | Method of tanning animal skins |
DE102016000243A1 (en) * | 2016-01-12 | 2017-07-13 | Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. | Leather hydrophobization process and leather produced therewith |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6210200A (en) * | 1985-07-05 | 1987-01-19 | 松本 稔 | Production of leather impregnated with silicone rubber |
FR2696477B1 (en) * | 1992-10-02 | 1994-11-18 | Commissariat Energie Atomique | Process for the treatment of skins, leathers or sheet materials containing collagen with a dense fluid under pressure. |
DE19507572A1 (en) * | 1995-03-03 | 1996-09-12 | Helmut Geihsler | Process for dressing animal hides or skins |
US20050214464A1 (en) * | 2002-05-02 | 2005-09-29 | Takashi Moriyoshi | Material such as hide, skin, leather or fur for use in manufacturing leather product, leather product, method for preparing said material, and method for manufacturing leather product |
-
2006
- 2006-02-22 DE DE102006008190A patent/DE102006008190A1/en not_active Withdrawn
-
2007
- 2007-02-01 EP EP07703213A patent/EP1987167B1/en not_active Not-in-force
- 2007-02-01 WO PCT/EP2007/000884 patent/WO2007096047A1/en active Application Filing
- 2007-02-01 ES ES07703213T patent/ES2385667T3/en active Active
- 2007-02-01 AT AT07703213T patent/ATE551435T1/en active
- 2007-02-01 UA UAA200811369A patent/UA91595C2/en unknown
- 2007-02-01 RU RU2008137588/12A patent/RU2401865C2/en not_active IP Right Cessation
Non-Patent Citations (1)
Title |
---|
See references of WO2007096047A1 * |
Also Published As
Publication number | Publication date |
---|---|
RU2008137588A (en) | 2010-03-27 |
ES2385667T3 (en) | 2012-07-30 |
UA91595C2 (en) | 2010-08-10 |
RU2401865C2 (en) | 2010-10-20 |
WO2007096047A1 (en) | 2007-08-30 |
EP1987167B1 (en) | 2012-03-28 |
ATE551435T1 (en) | 2012-04-15 |
DE102006008190A1 (en) | 2007-08-23 |
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