EP1124994A1 - Auxiliary for liming and loosening hairs of animal skins - Google Patents
Auxiliary for liming and loosening hairs of animal skinsInfo
- Publication number
- EP1124994A1 EP1124994A1 EP00940306A EP00940306A EP1124994A1 EP 1124994 A1 EP1124994 A1 EP 1124994A1 EP 00940306 A EP00940306 A EP 00940306A EP 00940306 A EP00940306 A EP 00940306A EP 1124994 A1 EP1124994 A1 EP 1124994A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- liming
- hair
- aid according
- aid
- skin
- 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
- C14C1/00—Chemical treatment prior to tanning
- C14C1/06—Facilitating unhairing, e.g. by painting, by liming
Definitions
- the object of the invention is an aid for skin disintegration and hair loosening, which is used in the manufacture of so-called liming of the untanned dermis, the so-called nakedness, freed of epidermis and subcutaneous connective tissue.
- the overall process of leather production consists of three main work steps, namely the water workshop, tanning and finishing.
- the salted and dried skin material is first returned to the hydrated state of the green skin by soaking. This is followed by treatment with alkaline hair loosening baths for the purpose of hair loosening and hair digestion. Hair loosening and skin disruption are generally carried out in a single process step, the liming. Fermentative loosening processes are also in use and processes in which the hair is completely destroyed by the action of keratolyzing agents. Swelling and alkaline reaction are finally eliminated by neutralization. In this state the skin is called "nakedness".
- Hair roots depend on whether the hair can be chemically destroyed or should be preserved. Are the Hair of less value, then chemical depilatory agents are applied directly to the hair side of the skin, the hair shafts being destroyed or at least more or less attacked.
- a sulphide-containing lime suspension is usually used for this. It is customary in industry to carry out this treatment (liming) in large vessels with movement.
- the lime suspension also affects the leather-forming skin substance. This change in the skin substance, the cremation, is very important for tanning. In order to obtain an optimal liming effect, you are often ready to take no account of hair preservation, even in cases where the hair could still be used well.
- the skin substance is primarily broken down by alkaline swelling, i.e. loosened up in their structure, which leads to greater porosity of the leather and to particular softness or speed, which e.g. is desirable for glove leather.
- alkaline swelling i.e. loosened up in their structure
- some accompanying proteins of the fibrillary connective tissue are removed.
- the duration and intensity of the liming can only be determined empirically, as the types of skin react very differently to the liming. Excessive swelling can result in "loose” or "trickling" scars, i.e.
- the uppermost layer of skin which contains hair root pores, emptied sweat glands and a branched blood vessel system, detaches from the underlying, compact fiber layer when the leather is bent and forms wrinkles.
- Ashes are understood to mean loosening of the hair and digestion of the skin, since they are often combined into one process. Most of the time, the two sub-processes overlap only partially, since one usually loosens or destroys the hair first and then unlocks the skin substance. As with hair loosening, many individual factors also work together in skin disruption.
- the liming chemicals are primarily intended to attack the keratin in the hair and epidermis without destroying the collagen in the skin.
- the keratin can be removed by reduction and hydrolysis.
- hydrolytically active bases are, for example, calcium hydroxide, hydrated lime [with 80 to 96% Ca (OH) 2 ] and sodium hydroxide solution.
- sodium sulfide, sodium hydrogen sulfide and calcium hydrogen sulfide have a reductive effect. The action of these substances also destroys the epidermis, so that this layer together with the hair can be easily lifted off with a blunt hair knife or by machine. Similar to depilators, sodium sulfide has a reducing effect on the sulfur-containing amino acids in keratin; then the quicklime can attack more easily and cause hydrolytic cleavage of the preceratins in the basal cell layer of the epidermis.
- the untanned dermis freed of epidermis and subcutaneous connective tissue, contains 60 to 80% water and fat when moist, the rest consists of approximately 98% collagen.
- Molasses is preferably used as the polysaccharide solution in the aid according to the invention.
- the use of molasses in leather processing is known per se. Molasses can be added to all operations in the water workshop. The addition of molasses when liming is particularly valuable, as it significantly improves the solubility of the hydrated lime in the liquor and thus improves skin disruption.
- molasses is generally preferred as a particularly inexpensive polysaccharide solution, other solutions containing water-soluble carbohydrates, e.g. Sugar solutions containing about 10 to 70% by weight sugar.
- the auxiliary is a mercaptocarboxylic acid or one of its salts, preferably thioglycolic acid.
- This Mercaptocarboxylic acid for Keratolytica is already known. It is mainly used in hair treatment, but also as a depilatory. Thioglycolates have also been used in the tannery to depilate hides, but have not achieved particularly great technical importance for this application.
- the auxiliary according to the invention also contains a mercapto alcohol, in particular mercaptoethanol in the form of its sodium alcoholate. It is characterized by a pronounced hair-loosening effect.
- the aid according to the invention leads to a significant improvement in the quality of the leather thus obtained.
- the skilled worker will notice that lighter pelts are obtained when the aid according to the invention is used, and an improvement in the range of leather qualities can thus be achieved.
- the aid mentioned results in particularly smooth pelts and thus the loss of surface area, which always occurs in leather production from a skin, is kept very low.
- the aid according to the invention causes a very high level of lime solubility, which is a prerequisite for particularly good skin digestion.
- the aid according to the invention brings with regard to the traditionally quite high environmental impact in leather production.
- the amount of inorganic sulfides or hydrosulfides to be used in liming can be considerably reduced, the removal of which from the waste water can be a considerable technical problem.
- the swelling of the skin which occurs during liming can be regulated more easily by the combination aid according to the invention than in the case of exclusive addition of sulfides or hydrogen sulfides.
- the aid according to the invention contains neither proteolytic nor lipolytic enzymes, the use of which has hitherto been regarded as largely the standard in liming.
- enzymes not only have the disadvantage of being relatively expensive, they also require strictly controlled process conditions in order to achieve optimal results. If the optimal temperature and pH conditions are not met when using enzymes to treat animal skins, the effects of the enzymes used are often inadequate, but sometimes too intense.
- the aid according to the invention can be further improved by adding hydrotropic substances.
- hydrotropic substances are substances whose addition improves the water solubility of another, poorly soluble substance. These include organic nitrogen compounds such as urea, thiourea, formamide, acetamide, N-methylacetamide and guanidine hydrochloride. But also organic sulfonic acids and carboxylic acids and their salts, e.g. Cumene sulfonate and even calcium chloride have hydrotropic effects. Hydrotropics work on proteins such as in the collagen structure of the skin, a splitting of the hydrogen bonds between the peptide chains and thus swelling, which facilitates the access of the keratinolytic active ingredients, but also that of the anionic or nonionic surfactants used for the fat solution.
- the auxiliary according to the invention is used in the process for skin disintegration and for loosening the hair of animal skins in addition to the commonly used alkalis, inorganic sulfides or hydrosulfides and anionic or nonionic surfactants in an aqueous solution, it usually being used in an amount of 0.1 to 5% by weight. -% is used.
- the process is generally at a pH above 11, preferably at a pH between 12 and 12.5 and at temperatures between 25 and 35 ° C for a period of 15 to 20 hours with temporary movement of the animal hides in the Liming drums used. With the paleness obtained from the raw skin by this process, particularly clean and light leather qualities can be produced, from which the hair roots are almost completely removed.
- the process is easy to control and gives excellent and consistent leather qualities.
- the environmental impact is significantly reduced since the wastewater obtained by the process according to the invention contains significantly fewer sulfides and no amines or other nitrogen-containing compounds. It is excellently suited for processing all kinds of hides, such as those of sheep, goats, pigs, but especially for processing beef hides.
- Example 1 Hair-destroying treatment of cowhides in switches and limbers
- naupr.- soft 150% water 28 ° C
- the skin is then fleshed, split and subjected to normal processing.
- Example 2 Hair-preserving treatment of cowhides in switches and limbers
- the skin is then fleshed, split and subjected to normal processing.
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Treatment And Processing Of Natural Fur Or Leather (AREA)
- Cosmetics (AREA)
- Thermotherapy And Cooling Therapy Devices (AREA)
- Medicines Containing Material From Animals Or Micro-Organisms (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19933968 | 1999-07-20 | ||
DE19933968A DE19933968A1 (en) | 1999-07-20 | 1999-07-20 | Aid for skin disintegration and hair loosening of animal skins |
PCT/EP2000/005076 WO2001006020A1 (en) | 1999-07-20 | 2000-06-03 | Auxiliary for liming and loosening hairs of animal skins |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1124994A1 true EP1124994A1 (en) | 2001-08-22 |
EP1124994B1 EP1124994B1 (en) | 2004-03-17 |
Family
ID=7915401
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP00940306A Revoked EP1124994B1 (en) | 1999-07-20 | 2000-06-03 | Auxiliary for liming and loosening hairs of animal skins |
Country Status (11)
Country | Link |
---|---|
US (1) | US6689172B1 (en) |
EP (1) | EP1124994B1 (en) |
KR (1) | KR20010079687A (en) |
CN (1) | CN1242073C (en) |
AT (1) | ATE262043T1 (en) |
AU (1) | AU5528400A (en) |
BR (1) | BR0006176A (en) |
DE (2) | DE19933968A1 (en) |
ES (1) | ES2215677T3 (en) |
WO (1) | WO2001006020A1 (en) |
ZA (1) | ZA200007294B (en) |
Families Citing this family (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10221152B4 (en) * | 2002-05-13 | 2008-10-30 | Schill + Seilacher Ag | Process for producing clean pelts in the water workshop |
AR039980A1 (en) * | 2002-05-22 | 2005-03-09 | Basf Ag | PROCEDURE TO ELIMINATE CORNEAL SKIN OR SKIN SUBSTANCES |
US7162289B2 (en) * | 2002-09-27 | 2007-01-09 | Medtronic Minimed, Inc. | Method and apparatus for enhancing the integrity of an implantable sensor device |
CN102071268A (en) * | 2011-01-12 | 2011-05-25 | 宁波工程学院 | Dry hair-saving unhair treatment method of raw hide |
CN104711380B (en) * | 2015-04-07 | 2016-08-17 | 无极县星皓皮革制品有限公司 | A kind of enzymatic depilation auxiliary agent and preparation method thereof |
CN105132600B (en) * | 2015-08-21 | 2017-05-31 | 四川大学 | Modulin enzyme is to collagen in Animal Skin and the method for elastin laminin selectively acting |
CN110358874A (en) * | 2018-04-09 | 2019-10-22 | 徐州鸿丰高分子材料有限公司 | Hair-protection and hair-removing composition preparation and its guarantor's hair depilating method |
DE102018110284A1 (en) | 2018-04-27 | 2019-10-31 | Werner & Mertz Gmbh | Aqueous composition for dissolving hair and corresponding uses and methods |
US11700860B2 (en) | 2018-09-27 | 2023-07-18 | The United States Of America, As Represented By The Secretary Of Agriculture | Method to clean and decontaminate animal carcasses using alkaline thioglycolate-containing compound |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
YU36755B (en) * | 1971-11-17 | 1984-08-31 | Basf Ag | Process for the elimination of hairs from hides and furs |
DE2911401A1 (en) * | 1979-03-23 | 1980-10-02 | Roehm Gmbh | METHOD FOR ASHING BLEES FROM ANIMAL SKIN AND SKIN |
DE2917376C2 (en) | 1979-04-28 | 1987-03-26 | Röhm GmbH, 6100 Darmstadt | Enzymatic process for hair extraction and simultaneous skin disintegration |
US4631064A (en) * | 1982-06-01 | 1986-12-23 | The Proctor & Gamble Company | Depilatory compositions |
DE29503135U1 (en) * | 1995-02-24 | 1995-05-24 | Röhm GmbH, 64293 Darmstadt | Multifunctional leather processing agents |
-
1999
- 1999-07-20 DE DE19933968A patent/DE19933968A1/en not_active Withdrawn
-
2000
- 2000-06-03 KR KR1020017002410A patent/KR20010079687A/en not_active Application Discontinuation
- 2000-06-03 CN CNB008008876A patent/CN1242073C/en not_active Expired - Fee Related
- 2000-06-03 EP EP00940306A patent/EP1124994B1/en not_active Revoked
- 2000-06-03 AT AT00940306T patent/ATE262043T1/en not_active IP Right Cessation
- 2000-06-03 AU AU55284/00A patent/AU5528400A/en not_active Abandoned
- 2000-06-03 WO PCT/EP2000/005076 patent/WO2001006020A1/en not_active Application Discontinuation
- 2000-06-03 DE DE50005677T patent/DE50005677D1/en not_active Revoked
- 2000-06-03 ES ES00940306T patent/ES2215677T3/en not_active Expired - Lifetime
- 2000-06-03 BR BR0006176-0A patent/BR0006176A/en not_active Application Discontinuation
- 2000-06-30 US US09/786,907 patent/US6689172B1/en not_active Expired - Fee Related
- 2000-12-08 ZA ZA200007294A patent/ZA200007294B/en unknown
Non-Patent Citations (1)
Title |
---|
See references of WO0106020A1 * |
Also Published As
Publication number | Publication date |
---|---|
KR20010079687A (en) | 2001-08-22 |
ATE262043T1 (en) | 2004-04-15 |
DE19933968A1 (en) | 2001-01-25 |
CN1304455A (en) | 2001-07-18 |
CN1242073C (en) | 2006-02-15 |
BR0006176A (en) | 2001-04-17 |
AU5528400A (en) | 2001-02-05 |
ZA200007294B (en) | 2001-10-11 |
ES2215677T3 (en) | 2004-10-16 |
WO2001006020A1 (en) | 2001-01-25 |
US6689172B1 (en) | 2004-02-10 |
EP1124994B1 (en) | 2004-03-17 |
DE50005677D1 (en) | 2004-04-22 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
DD210078A5 (en) | PROCESS FOR THE ENVIRONMENTALLY FRIENDLY DISCHARGE OF RAW HOUSEHES | |
EP2421995B1 (en) | Method for tanning animal skins | |
DE2917376C2 (en) | Enzymatic process for hair extraction and simultaneous skin disintegration | |
EP1124994B1 (en) | Auxiliary for liming and loosening hairs of animal skins | |
EP0326059B1 (en) | Liming process for obtaining hair | |
DE3429047C2 (en) | ||
DE2404789B2 (en) | Process for the production of ready-to-tan pelts from animal hides and skins | |
DE3224881A1 (en) | METHOD FOR THE PRODUCTION OF HAIRY, STORAGE SKIN MATERIAL | |
DE2856320C2 (en) | ||
DE2911401C2 (en) | ||
DE2929844A1 (en) | SOFT METHOD | |
DE1230169B (en) | Process for the production of tanned bare | |
DE2301591C3 (en) | Process for the production of ready-to-tan pelts from animal hides and skins | |
DE3439490A1 (en) | MICROBIAL METHOD FOR OBTAINING BLANKS FROM ANIMAL SKIN | |
DE1233530B (en) | Process for the enzymatic depilation and / or dressing of skins and pelts | |
DE10221152B4 (en) | Process for producing clean pelts in the water workshop | |
DD284695A5 (en) | ENVIRONMENTALLY FRIENDLY PROCESS FOR SHEETING RAW ANIMAL SKIN AND SKIN | |
DE4332785A1 (en) | Improved enzyme-assisted liming process | |
DE2307603C3 (en) | ||
DE646721C (en) | Process for dehairing and shearing hides and skins | |
DE2301591B2 (en) | PROCESS FOR THE MANUFACTURING OF TANNED BLOES FROM ANIMAL SKIN AND FUR | |
DE10008770A1 (en) | Liming and depilating skins and pelts using a catoxidative-enzymatic treatment in which the softened and defleshed skins and pelts are treated in a reductive phase in alkaline medium | |
DE703853C (en) | Process for the production of skin blooms ready for tanning | |
DE3440750A1 (en) | Process for hide-digestion of large-animal hides and calf skins | |
MXPA01002872A (en) | Auxiliary for liming and loosening hairs of animal skins |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
17P | Request for examination filed |
Effective date: 20001208 |
|
AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE |
|
17Q | First examination report despatched |
Effective date: 20030318 |
|
GRAP | Despatch of communication of intention to grant a patent |
Free format text: ORIGINAL CODE: EPIDOSNIGR1 |
|
GRAS | Grant fee paid |
Free format text: ORIGINAL CODE: EPIDOSNIGR3 |
|
RIN1 | Information on inventor provided before grant (corrected) |
Inventor name: HEISE, MARTIN Inventor name: WOHLMUTH, PETER Inventor name: WICK, GERTRUD Inventor name: FEIGEL, THOMAS |
|
GRAA | (expected) grant |
Free format text: ORIGINAL CODE: 0009210 |
|
AK | Designated contracting states |
Kind code of ref document: B1 Designated state(s): AT DE ES GB IT |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: GB Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20040317 |
|
REG | Reference to a national code |
Ref country code: GB Ref legal event code: FG4D Free format text: NOT ENGLISH |
|
REG | Reference to a national code |
Ref country code: IE Ref legal event code: FG4D Free format text: GERMAN |
|
REF | Corresponds to: |
Ref document number: 50005677 Country of ref document: DE Date of ref document: 20040422 Kind code of ref document: P |
|
RAP2 | Party data changed (patent owner data changed or rights of a patent transferred) |
Owner name: TRUMPLER GMBH & CO. KG, CHEMISCHE FABRIK |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: AT Payment date: 20040611 Year of fee payment: 5 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: ES Payment date: 20040622 Year of fee payment: 5 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: DE Payment date: 20040826 Year of fee payment: 5 |
|
GBV | Gb: ep patent (uk) treated as always having been void in accordance with gb section 77(7)/1977 [no translation filed] |
Effective date: 20040317 |
|
REG | Reference to a national code |
Ref country code: ES Ref legal event code: FG2A Ref document number: 2215677 Country of ref document: ES Kind code of ref document: T3 |
|
REG | Reference to a national code |
Ref country code: IE Ref legal event code: FD4D |
|
PLBI | Opposition filed |
Free format text: ORIGINAL CODE: 0009260 |
|
PLBQ | Unpublished change to opponent data |
Free format text: ORIGINAL CODE: EPIDOS OPPO |
|
26 | Opposition filed |
Opponent name: TFL LEDERTECHNIK GMBH Effective date: 20041102 |
|
PLAX | Notice of opposition and request to file observation + time limit sent |
Free format text: ORIGINAL CODE: EPIDOSNOBS2 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: IT Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20050603 |
|
PLBB | Reply of patent proprietor to notice(s) of opposition received |
Free format text: ORIGINAL CODE: EPIDOSNOBS3 |
|
RDAF | Communication despatched that patent is revoked |
Free format text: ORIGINAL CODE: EPIDOSNREV1 |
|
RDAG | Patent revoked |
Free format text: ORIGINAL CODE: 0009271 |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: PATENT REVOKED |
|
27W | Patent revoked |
Effective date: 20050709 |