WO2005040431A1 - Beschichtung von leder mittels einer kunststoffdispersion - Google Patents
Beschichtung von leder mittels einer kunststoffdispersion Download PDFInfo
- Publication number
- WO2005040431A1 WO2005040431A1 PCT/EP2004/011689 EP2004011689W WO2005040431A1 WO 2005040431 A1 WO2005040431 A1 WO 2005040431A1 EP 2004011689 W EP2004011689 W EP 2004011689W WO 2005040431 A1 WO2005040431 A1 WO 2005040431A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- leather
- grain
- plastic
- grain layer
- compact particles
- Prior art date
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
- C14C11/00—Surface finishing of leather
-
- 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
- C14C11/00—Surface finishing of leather
- C14C11/003—Surface finishing of leather using macromolecular compounds
-
- C—CHEMISTRY; METALLURGY
- C14—SKINS; HIDES; PELTS; LEATHER
- C14B—MECHANICAL TREATMENT OR PROCESSING OF SKINS, HIDES OR LEATHER IN GENERAL; PELT-SHEARING MACHINES; INTESTINE-SPLITTING MACHINES
- C14B7/00—Special leathers and their manufacture
Definitions
- the invention relates to a method for eliminating imperfections in the grain layer of a full-grain leather, in particular cowhide leather, a plastic compound eliminating these being applied to the imperfections.
- the invention further relates to a full-grain leather, in particular cowhide, in which the imperfections in the grain layer are eliminated.
- the grain layer of full-grain leather in particular cowhide leather, often has defects, caused, for example, by hedge cracks, barbed wire injuries, insect bites or the like, which are only present in individual places, at most on an area of 10%, of the leather skin, but nevertheless this leather skin make it less valuable.
- Such leathers are therefore converted into so-called corrected grain leathers by filling in the flaws and then sanding down the grain layer, but these have a lower value and can only be marketed at a substantial discount.
- This foamed plastic layer must have a thickness such that it fills the negative whale nappa structure on the surface of the roller or plate, so that for this reason a leather treated in this way can no longer be called genuine leather, since the whale nappa effect is achieved by embossing.
- the object of the present invention is to create a method by means of which defects in the grain layer of a full-grain leather, in particular cowhide leather, can be eliminated, so that the existing damage to the grain layer is no longer noticeable, but without the disadvantages of known methods occur, after which very thin finishes can also be applied, so that such leather can be referred to as genuine leather.
- the method according to the invention is intended to fill in the imperfections in the grain layer, which are generally formed by depressions, in such a way that the filling compound does not fall out even when the leather is subjected to permanent bending stress, and furthermore that the filling compound does not fall after it has solidified shrinks that it is waterproof and that it mainly only cleans up the imperfections and does not cover the entire surface of the scar layer or only with a very small thickness.
- the invention proposes that an aqueous, optionally slightly foamed, plastic dispersion, which contains the smallest compact particles, is pressed into the defects and then the leather is dried, whereupon the grain layer is subjected to a pressure and heat treatment, which results in the compact particles are formed in the solidified plastic dispersion at least partially hollow microspheres.
- the process according to the invention does not use a pasty filler, but rather an aqueous plastic dispersion to fill in the flaws, the adhesion to the flaws is significantly improved, the compact particles expanding to form the hollow microspheres as a result of the pressure and heat treatment, and thereby Overpressure arises, so that the plastic mass that arises after drying at the flaws firmly connects to the surface of the flaws and in particular to the borders of the depressions forming the flaws and withstands any bending stress.
- the hollow microspheres in the len provided surface of the grain layer, formed from the solidified plastic dispersion plastic mass are at least largely destroyed by the pressure and heat treatment or can not form at all, so that a maximum of a plastic layer, the thickness of which is usually not measurable, arises at these points in any case is thinner than 60 ⁇ m.
- the plastic dispersion is pressed into the imperfections by means of an application roller, preferably in opposite directions, optionally having a finely structured surface, so that the plastic dispersion is applied with a doctor blade in a thickness that is very low outside of the imperfections.
- the pressure and heat treatment is effected according to the invention by a pressure roller which contacts the scar layer and is heated to a temperature of at least 100 ° C., preferably between 120 ° C. and 180 ° C., by means of which the at least partially solidified plastic dispersion is pressed firmly into the defects and the compact particles expand to form the hollow microspheres in the solidified plastic dispersion.
- the surface of the pressure roller can be smooth.
- the pressure roller preferably has a finely structured surface, such as can be achieved, for example, by sandblasting, as a result of which the surface of the plastic mass filling the defects also has such a structure.
- compact particles with a size of less than 10 ⁇ m, preferably less than 7 ⁇ m, are used in an amount between 15 g and 60 g, based on 1 kg of a 40% plastic dispersion, and made of a thermoplastic Are made of plastic and contain a liquid blowing agent.
- a complete filling of the wells forming the defects is ensured with the plastic mass formed from the plastic dispersion and an intimate connection thereof with the surface of the wells is ensured.
- Compact particles are expediently used which expand at a temperature below 120 ° C., preferably below 80 ° C. At such temperatures, no pronounced spatial structure is formed on the undamaged surface of the grain layer by a plastic dispersion that may have been applied there after it has solidified.
- disruptive hollow microspheres can be eliminated or their formation can be prevented at all by a mixture of water and solvent, for example 90 parts water, according to the invention on the solidified plastic dispersion and 10 parts of solvent, in particular ethyl acetate, preferably sprayed on, followed by pressure and heat treatment.
- the hollow microspheres which are then in a moist state, then collapse in the presence of a small amount of solvent even at temperatures below 65 ° C. and at a pressure of less than 0.5 kg / cm or they are not formed at all.
- pigmented compact particles are expediently used, the color of which corresponds to that of the grain layer and / or the plastic dispersion.
- a full-grain leather, in particular cowhide, which has partial flaws on its grain layer, which are corrected by a plastic filling compound, is characterized in accordance with the invention in that the plastic filling compound consists of a solidified, aqueous plastic dispersion containing hollow microspheres formed by the supply of heat, which consists of Applying is pressed into the imperfections.
- the formation of the hollow microspheres is preferably stronger in the area adjacent to the surface of the scar layer than in the area farther away from this surface, which has the advantage that, after pressure relief, the solidified plastic dispersion containing hollow microspheres does not expand over the surface of the scar layer.
- This plastic dispersion contains compact particles made of a thermoplastic copolymer, from which hollow microspheres are formed by the application of heat
- the aqueous plastic dispersion is applied to the surface 4 of the grain layer 2 by means of an application roller which is finely structured on its surface, with means which the aqueous plastic dispersion is brushed into the recesses like with a squeegee. Subsequently, the leather with the applied plastic dispersion is dried and it is 4 the grain layer 2 subjected to the surface by means of a heated to a temperature between 120 ° C and 180 C C pressure roller of a pressure and heat treatment. The compact particles expand, so that a small plastic hollow mass 5 containing hollow microspheres 5 is formed in the recesses, which is pressed firmly into the recesses by the pressure exerted and connects intimately to the edges of the recesses.
- the hollow microspheres mainly form only in the area 4 adjacent to the surface 4 of the depressions forming the defects 3 , whereas there is less training in the lower areas or the compact particles do not expand at all.
- a suitable pressure but above all by choosing a suitable temperature of the pressure roller and the dwell time thereof on the surface 4
- hollow microspheres are formed only to a depth of 0.12 mm. Nevertheless, the depressions are completely filled by the solidified plastic dispersion.
- the dwell time is halved, and the formation of the hollow microspheres as a result of the heat is then prevented in those areas where there are no defects 3.
- the formation of the hollow microspheres is prevented at all by the applied pressure, or already formed hollow microspheres are pressed together in such a way that, if at all, only a non-disturbing plastic coating of barely measurable thickness is created which does not affect the grain of the leather.
- Hollow microspheres for example, in a plastic coating in these areas can also be eliminated by spraying a mixture of about 90 parts of water and 10 parts of solvent, for example ethylene acetate, and then subjecting these areas to pressure and heat treatment. In this moist state, the hollow microspheres then collapse even at temperatures below 65 ° C. at a pressure of less than 0.5 kg / cm 2 , so that in this process the hollow microspheres collapse or are not formed at all.
- solvent for example ethylene acetate
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Treatment And Processing Of Natural Fur Or Leather (AREA)
- Synthetic Leather, Interior Materials Or Flexible Sheet Materials (AREA)
- Manufacture Of Porous Articles, And Recovery And Treatment Of Waste Products (AREA)
- Compositions Of Macromolecular Compounds (AREA)
- Application Of Or Painting With Fluid Materials (AREA)
Abstract
Description
Claims
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
BRPI0415512-2A BRPI0415512B1 (pt) | 2003-10-20 | 2004-10-16 | Processo para eliminar os defeitos em uma camada de grão de um couro totalmente granoso, e, couro totalmente granoso |
KR1020067009836A KR101161036B1 (ko) | 2003-10-20 | 2004-10-16 | 분산된 합성 수지로 가죽을 코팅하는 방법 |
US10/576,020 US20070074352A1 (en) | 2003-10-20 | 2004-10-16 | Method for coating leather with dispersed synthetic resin |
ES04790527T ES2426438T3 (es) | 2003-10-20 | 2004-10-16 | Revestimiento de cuero por medio de una dispersión plástica |
EP04790527.8A EP1678332B1 (de) | 2003-10-20 | 2004-10-16 | Beschichtung von leder mittels einer kunststoffdispersion |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
ATGM727/2003 | 2003-10-20 | ||
AT0072703U AT7186U1 (de) | 2003-10-20 | 2003-10-20 | Verfahren zur beseitigung von fehlstellen in der narbenschicht eines vollnarbigen leders, sowie leder, dessen fehlstellen in der narbenschicht beseitigt sind |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2005040431A1 true WO2005040431A1 (de) | 2005-05-06 |
Family
ID=31722022
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP2004/011689 WO2005040431A1 (de) | 2003-10-20 | 2004-10-16 | Beschichtung von leder mittels einer kunststoffdispersion |
Country Status (10)
Country | Link |
---|---|
US (1) | US20070074352A1 (de) |
EP (1) | EP1678332B1 (de) |
KR (1) | KR101161036B1 (de) |
CN (1) | CN1875119A (de) |
AR (1) | AR046423A1 (de) |
AT (1) | AT7186U1 (de) |
BR (1) | BRPI0415512B1 (de) |
DE (1) | DE20318311U1 (de) |
RU (1) | RU2370544C2 (de) |
WO (1) | WO2005040431A1 (de) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8697232B2 (en) * | 2006-02-20 | 2014-04-15 | Lanxess Deutschland Gmbh | Pressureless expansion by means of superheated steam |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
AT8680U1 (de) | 2006-04-05 | 2006-11-15 | Schaefer Philipp | Verfahren und vorrichtung zum aufbringen einer beschichtung auf die narbenseite eines leders |
CN102702982A (zh) * | 2012-05-24 | 2012-10-03 | 浙江东化实业有限公司 | 全粒面皮革抛光补伤膏 |
EP2829617A1 (de) * | 2013-07-26 | 2015-01-28 | TFL Ledertechnik GmbH | Verfahren zum Nachgerben von Leder |
IT202200011222A1 (it) | 2022-05-27 | 2023-11-27 | Lamberti Spa | Nobilitazione di pelli in crust |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3921145A1 (de) * | 1989-06-28 | 1991-01-10 | Basf Ag | Verfahren zum mattieren von lederoberflaechen |
CN1161377A (zh) * | 1997-01-31 | 1997-10-08 | 张淑文 | 聚丙烯酸酯类皮革修补剂的制备方法 |
EP1300474A1 (de) | 2001-10-04 | 2003-04-09 | Philipp Schaefer | Vollnarbiges Rindnappaleder und Verfahren zur Herstellung desselben |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
NZ208557A (en) * | 1983-06-22 | 1988-11-29 | Lubrizol Genetics Inc | Recombinant nif (nitrogen fixation) promoters - foreign structural gene combinations, plasmids, transformants and method of expressing the structural gene in plants |
-
2003
- 2003-10-20 AT AT0072703U patent/AT7186U1/de not_active IP Right Cessation
- 2003-11-26 DE DE20318311U patent/DE20318311U1/de not_active Expired - Lifetime
-
2004
- 2004-10-16 CN CNA2004800309560A patent/CN1875119A/zh active Pending
- 2004-10-16 BR BRPI0415512-2A patent/BRPI0415512B1/pt not_active IP Right Cessation
- 2004-10-16 US US10/576,020 patent/US20070074352A1/en not_active Abandoned
- 2004-10-16 EP EP04790527.8A patent/EP1678332B1/de not_active Not-in-force
- 2004-10-16 WO PCT/EP2004/011689 patent/WO2005040431A1/de active Search and Examination
- 2004-10-16 RU RU2006117192/12A patent/RU2370544C2/ru active
- 2004-10-16 KR KR1020067009836A patent/KR101161036B1/ko active IP Right Grant
- 2004-10-20 AR ARP040103792A patent/AR046423A1/es unknown
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3921145A1 (de) * | 1989-06-28 | 1991-01-10 | Basf Ag | Verfahren zum mattieren von lederoberflaechen |
CN1161377A (zh) * | 1997-01-31 | 1997-10-08 | 张淑文 | 聚丙烯酸酯类皮革修补剂的制备方法 |
EP1300474A1 (de) | 2001-10-04 | 2003-04-09 | Philipp Schaefer | Vollnarbiges Rindnappaleder und Verfahren zur Herstellung desselben |
Non-Patent Citations (1)
Title |
---|
DATABASE WPI Section Ch Week 200323, Derwent World Patents Index; Class A14, AN 2003-230297, XP002313663 * |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8697232B2 (en) * | 2006-02-20 | 2014-04-15 | Lanxess Deutschland Gmbh | Pressureless expansion by means of superheated steam |
Also Published As
Publication number | Publication date |
---|---|
BRPI0415512B1 (pt) | 2014-02-04 |
RU2370544C2 (ru) | 2009-10-20 |
RU2006117192A (ru) | 2007-12-10 |
EP1678332B1 (de) | 2013-08-14 |
AT7186U1 (de) | 2004-11-25 |
DE20318311U1 (de) | 2004-02-12 |
BRPI0415512A (pt) | 2006-12-12 |
CN1875119A (zh) | 2006-12-06 |
KR101161036B1 (ko) | 2012-06-28 |
KR20060127386A (ko) | 2006-12-12 |
AR046423A1 (es) | 2005-12-07 |
US20070074352A1 (en) | 2007-04-05 |
EP1678332A1 (de) | 2006-07-12 |
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