EP1511809A1 - Corps moule en trois dimensions muni d'une surface de type cuir - Google Patents

Corps moule en trois dimensions muni d'une surface de type cuir

Info

Publication number
EP1511809A1
EP1511809A1 EP03732488A EP03732488A EP1511809A1 EP 1511809 A1 EP1511809 A1 EP 1511809A1 EP 03732488 A EP03732488 A EP 03732488A EP 03732488 A EP03732488 A EP 03732488A EP 1511809 A1 EP1511809 A1 EP 1511809A1
Authority
EP
European Patent Office
Prior art keywords
leather
fibers
pulp
weight
fiber
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Withdrawn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
EP03732488A
Other languages
German (de)
English (en)
Inventor
Christian KÖTTER
Martin Mangold
Reimund Piatkowski
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.)
HP Chemie Pelzer Research and Development Ltd
Original Assignee
HP Chemie Pelzer Research and Development Ltd
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
Priority claimed from DE10248381A external-priority patent/DE10248381A1/de
Application filed by HP Chemie Pelzer Research and Development Ltd filed Critical HP Chemie Pelzer Research and Development Ltd
Publication of EP1511809A1 publication Critical patent/EP1511809A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L89/00—Compositions of proteins; Compositions of derivatives thereof
    • C08L89/04—Products derived from waste materials, e.g. horn, hoof or hair
    • C08L89/06—Products derived from waste materials, e.g. horn, hoof or hair derived from leather or skin, e.g. gelatin
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L7/00—Compositions of natural rubber
    • C08L7/02—Latex
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/4935—Impregnated naturally solid product [e.g., leather, stone, etc.]

Definitions

  • the invention relates to a process for the production of three-dimensional molded skins with a leather-like surface and the molded articles obtainable by this process.
  • the main component of leather fiber is the leather fiber ground from leather residues.
  • polymeric binders such as natural latex, polyacrylates, polyvinyl acetates as well as their copolymers and various additives.
  • the properties are determined by the type of production, the density and above all by the components - leather fiber and binder. Since the effect of leather fiber is paramount, you can say that leather fiber not only looks like leather, but also smells and feels like it. In contrast to leather, the properties are more uniform due to the usual production as sheet goods. Until the end of the 1950s, leather fiber was still manufactured by hand in so-called sieve boxes, so in the 1960s and 1970s most companies switched to continuous production on modified Fourdrinier machines, as is known from the paper industry.
  • leather waste is known from "Ulimann's Encyclopedia of Industrial Chemistry", 4th ed. Vol. 16, p. 174. After this, leather waste can be shredded and then processed into leather fiber materials. This includes single-layer fabrics made of leather fibers and binders. Thereafter, the leather fiber materials are used for baggage goods, but above all in shoe manufacture and for technical leather seals.
  • the leather waste is, for example, fiberized wet or dry in beating mills or wet in toothed disk mills and refiners or also in grinding hollands, the fibers having a length of 0.1 to 15 mm.
  • Binder Water-insoluble, in particular natural or artificial rubber latexes and dispersions of acrylic ester, vinyl ester and isobutylene polymers and copolymers have proven successful as binders.
  • the amount of binder is between 8 and 40%.
  • leather fiber materials with higher proportions (20 to 30%) of water-insoluble binders the character of the binder predominates.
  • the fiber character predominates; these materials are more absorbent and leather-like.
  • DE 34 17 369 C2 discloses a method for producing an injection-moldable composite material in which a polyester-cotton mixed fiber from waste material is fused with a polyolefin.
  • the material produced in this way lacks sufficient water absorption as well as the leather-typical grip properties.
  • WO 94/02300 describes molded parts with leather-like surface properties in the automotive sector, comprising a thermoplastic or elastic thermosetting plastic and ground leather waste in an amount of up to 95% by weight, based on the molded part.
  • the object of the present invention is to provide a method for the direct production of three-dimensional shaped articles from leather fiber materials.
  • the aforementioned object is achieved by a process for producing three-dimensional molded skins with a leather-like surface, which is characterized in that the porous surface of a suction tool with the geometry of the three-dimensional molded body is introduced into a pulp containing leather fibers, suspending agents and binders on the surface of the suction tool by applying a vacuum in the suction tool to deposit the pulp leather fibers in a desired layer thickness, then feed the surface of the suction tool to a pressing tool and compress the leather fiber layer, optionally profiling the surface and, if necessary, partially or completely drying and providing the leather fiber surface with a surface finish.
  • the main raw material is leather fibers. They are divided primarily according to the Gerbart. The focus is on chrome tanning (wet blue) and vegetable tanning, and more recently also glutardialdehyde tanning (wet white).
  • chrome-tanned fibers represent the largest fraction. They are obtained, for example, from the tanneries in the form of chrome shavings.
  • a cowhide is unevenly thick, usually 4 to 5 mm, the desired leather should usually be 1 to 1.5 mm thick. So you want to split the skin into several layers and then level them with a rotating knife. This is not untanned because it is too flexible. Fully tanned, it is too expensive because then a large part of the chemicals used for tanning are lost again with the shavings. That is why the skin is only pre-tanned before folding and you get a preliminary stage of the leather, the wet blue and the shavings. This means that the shavings must be tanned, greased and colored in the same way as the tanner's process. Since chrome-tanned leather is generally particularly soft and flexible, particularly soft leather fiber material can also be produced from chrome shavings.
  • Vegetable-tanned shavings are mainly obtained in the form of lead frames, which remain after the shoe soles have been punched. Such leathers are fully tanned, very strong, but also very rigid. The ideal raw material for parts that need to maintain good shape. If, on the other hand, suppleness is required, a greater effort must be made in the formulation. Nevertheless, vegetable tanning is particularly interesting for automotive interior trim because, unlike chrome tanning, it enables less shrinkage when exposed to high temperatures. In addition, the embossability is significantly better than with leather fiber from chrome-tanned chips.
  • Glutardialdehyde tanning is mostly used in combination with other devices and provides chrome-free leather with good heat shrinking behavior.
  • the corresponding shavings are even weaker than the chrome shavings.
  • the production of leather fiber from wet white shavings is relatively complex, the softness that we are used to from chrome rebate shavings has not been achieved so far.
  • non-collagen fibers such as cellulose
  • Cotton or plastic fibers such as polyamide fibers can have advantages such as increasing production speed or improving mechanical ones Properties cause, but these mostly longer fibers often cause problems regarding the surface smoothness after coating.
  • the leather characteristics decrease significantly with increasing foreign fiber content. Nevertheless, the present invention also includes the use of these foreign fibers
  • the production of leather fiber is similar to that of paper.
  • the leather residues are dry comminuted, for example, in a cutting mill and then wet-ground to the desired fiber length, preferably 0.1 to 15 mm, in particular 0.2 to 3 mm.
  • the fatliquor is of particular importance.
  • the fat-water emulsion must be stabilized so that the fat is completely absorbed onto the leather fiber and penetrates into the capillary spaces.
  • the degree of flocculation is also determined by the fatliquor. If the fibers floc too fine, you get an excellent molded body and thus an excellent surface, but the leather fiber material becomes too hard. Too coarse flocculation results in good softness, but not enough cohesion of the fibers and therefore poor strength. It goes without saying that the fat should be low in fogging.
  • the binder in the pulp to be used according to the invention preferably consists of thermoplastic and / or thermosetting material and is in particular selected from natural rubber, polyurethanes, polyacrylates, dispersions of acrylic esters, vinyl esters and isobutylene polymers and copolymers or a vinyl acetate.
  • the pulp contains the aforementioned binder, for example in an amount of 10 to 50% by weight, in particular in an amount of 15 to 30% by weight.
  • the binder is preferably added as a latex. Latex is made up of tiny polymer particles suspended in water. In order to keep such a suspension stable, the latex particles are usually electrically charged on the surface. As a result, they repel each other; agglomeration and failures are prevented. If the leather fibers now have a charge opposite the latex particles, they coagulate directly on the fiber. By optimally setting the charge ratios, it is possible to use very large quantities of binder without this affecting the sewage treatment plant.
  • the porous surface of a suction tool - which can have both a positive and a negative shape - with the geometry of the three-dimensional shaped body is introduced into the pulp thus obtained.
  • the leather fibers are deposited in a desired layer thickness on the surface of the suction tool.
  • the suction tool with the leather fibers adhering to the surface is fed to a pressing tool and the leather fiber layer is dewatered and compacted, optionally profiled on the surface, thereby partially or completely dried in a separate step, if necessary and provided with a surface preparation. Then the surface can be smoothed with satin and sanding.
  • the porous surface of a sintered powder metal, a ceramic, a metal foam, a plastic foam or a sieve is particularly preferably used for producing the shaped body.
  • This porous surface has the geometry of the three-dimensional shaped body, for example an armrest or a dashboard of a motor vehicle.
  • an aqueous pulp is particularly preferably used according to the invention.
  • a pulp which contains leather fibers in an amount of 0.1 to 10% by weight, in particular in an amount of 0.5 to 2% by weight.
  • the desired surface properties of the molded parts to be produced can be produced by known methods of stamping, grinding, plasma treatment, corona treatment, by sandblasting or shot peening.
  • the method according to the invention is particularly preferably such that the leather fibers are applied in a dry layer thickness of 0.1 to 6 mm, in particular 0.1 to 2 mm, particularly 0.3 to 0.6 mm. It is obvious to the person skilled in the art that the leather fibers must be applied in a higher density when moist from the leather fiber pulp shrink them a lot after drying.
  • dry layer thickness naturally encompasses moldings which still have a low residual moisture content of approximately 15-30%, for example, after they have been dried at 70 ° C. for 2 minutes.
  • the binder forms a film during drying.
  • the binder can be polymerized, polycondensed and / or crosslinked.
  • the collagen fibers are naturally also crosslinked with one another by the binder, if appropriate also existing foreign fibers.
  • thermoplastic and / or thermosetting plastic materials For the production of moldings with a complicated geometry, it is possible to use a pressing tool with movable slides to form undercuts. This is a technique, in particular in the automotive sector, for the production of corresponding molded articles from thermoplastic and / or thermosetting plastic materials.
  • the finish can be applied to the dried leather fiber layer in a manner known per se.
  • brushing or spraying onto the leather fiber layer after drying and / or the pressing tool surface before compacting is appropriate.
  • the shaped bodies with a leather-like surface particularly preferably comprise furniture, clothing, accessories, system parts, facings and claddings, in particular for the vehicle sector.
  • the vehicle area floor linings, trunk linings,
  • Roof linings, dashboard linings, switches, gear lever handles, door handles and / or steering wheel covers are just as suitable as seat cushions, seat backrests or hat racks etc.
  • the leather fibers can be used wherever the optical properties play an important role. However, a sound-absorbing effect is also important.
  • aqueous leather fiber pulp with leather fibers with an average fiber length of 1 mm and a solids content of 2% and an addition of 20% fat based on the dry fiber was mixed with the usual tanning agent and aluminum sulfate. This pulp was placed in a 1000 ml beaker. 30 g of commercially available natural latex with a solids content of 3% were added. Immediately after the latex addition, mixing was carried out for 2 minutes.
  • a replica of a dashboard was immersed in the leather fiber pulp prepared according to (a).
  • the replica of the dashboard consisted of a porous ceramic body with an average pore size of 0.02 mm.
  • the surface not immersed in the pulp was not porous.
  • the molded body was pulled out of the leather fiber pulp while maintaining the negative pressure.
  • the dashboard replica was then transferred to a pressing tool and the separated leather fiber coating was vacuumed dry.
  • the exposed surface of the leather fibers was then provided and pressed in a manner known per se with a finish made of PU or other substances known from the leather industry.

Landscapes

  • Health & Medical Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Dermatology (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Laminated Bodies (AREA)
  • Treatment And Processing Of Natural Fur Or Leather (AREA)
  • Synthetic Leather, Interior Materials Or Flexible Sheet Materials (AREA)
  • Vehicle Interior And Exterior Ornaments, Soundproofing, And Insulation (AREA)
  • Paper (AREA)

Abstract

L'invention concerne un procédé permettant de produire des peaux moulées en trois dimensions, munies d'une surface de type cuir, ainsi que des corps moulés obtenus selon ledit procédé.
EP03732488A 2002-06-01 2003-05-28 Corps moule en trois dimensions muni d'une surface de type cuir Withdrawn EP1511809A1 (fr)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
DE10224405 2002-06-01
DE10224405 2002-06-01
DE10248381 2002-10-17
DE10248381A DE10248381A1 (de) 2002-06-01 2002-10-17 Dreidimensionaler Formkörper mit lederartiger Oberfläche
PCT/EP2003/005615 WO2003102081A1 (fr) 2002-06-01 2003-05-28 Corps moule en trois dimensions muni d'une surface de type cuir

Publications (1)

Publication Number Publication Date
EP1511809A1 true EP1511809A1 (fr) 2005-03-09

Family

ID=29713123

Family Applications (1)

Application Number Title Priority Date Filing Date
EP03732488A Withdrawn EP1511809A1 (fr) 2002-06-01 2003-05-28 Corps moule en trois dimensions muni d'une surface de type cuir

Country Status (6)

Country Link
US (1) US20050202268A1 (fr)
EP (1) EP1511809A1 (fr)
JP (1) JP2005535792A (fr)
CN (1) CN1293145C (fr)
AU (1) AU2003238421A1 (fr)
WO (1) WO2003102081A1 (fr)

Families Citing this family (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102004039319B4 (de) * 2004-08-12 2010-02-18 MöllerTech GmbH Verfahren zum Herstellen einer lederartigen Oberfläche eines Artikels und Artikel
MX2008005226A (es) * 2005-10-20 2008-10-17 Dow Reichhold Specialty Latex Material mixto de cuero.
WO2011007184A2 (fr) 2009-07-17 2011-01-20 Carbon Fibre Preforms Ltd Matrice fibreuse et son procédé de fabrication
US8556319B2 (en) * 2009-08-28 2013-10-15 Johnson Controls Technology Company Laser etched trim
ITPG20100038A1 (it) * 2010-06-14 2011-12-15 Noonk S R L Prodotto a strati multipli derivato dal recupero e dalla compattazione di scampoli di pelle o scampoli di tessuto
US9481777B2 (en) 2012-03-30 2016-11-01 The Procter & Gamble Company Method of dewatering in a continuous high internal phase emulsion foam forming process
CN104608539B (zh) * 2014-12-25 2017-05-10 浙江池河科技有限公司 一种仿毛孔压花辊及其生产方法和应用
US11913166B2 (en) 2015-09-21 2024-02-27 Modern Meadow, Inc. Fiber reinforced tissue composites
ES2806990T3 (es) 2016-02-15 2021-02-19 Modern Meadow Inc Procedimiento para fabricar un material biofabricado que contiene fibrillas de colágeno
CN105922672A (zh) * 2016-05-14 2016-09-07 桐乡市辉欧皮草服饰有限公司 一种皮草面料
CN106351076B (zh) * 2016-08-29 2018-12-04 福建永盛皮革制品有限公司 一种利用含铬皮屑制作模塑品的方法
AU2018253595A1 (en) 2017-11-13 2019-05-30 Modern Meadow, Inc. Biofabricated leather articles having zonal properties
AU2020209847B2 (en) 2019-01-17 2024-10-17 Modern Meadow, Inc. Layered collagen materials and methods of making the same
DE102021119667A1 (de) * 2021-07-28 2023-02-02 Revoltech GmbH Verfahren zur Herstellung eines pflanzlichen textilen Flächengebildes
EP4230683A1 (fr) * 2022-02-18 2023-08-23 Salamander SPS GmbH & Co. KG Matière composite

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB360968A (en) * 1929-09-20 1931-11-16 Invenzioni Brevetti Anonima To Production of compound materials or fabrics from fibres
GB360371A (en) * 1929-09-20 1931-10-29 Invenzioni Brevetti Anonima To Improvements in or relating to the manufacture of sheet material from fibres produced from animal hides and skins
DE756874C (de) * 1939-03-26 1953-03-16 Degussa Verfahren zur Herstellung von Lederersatz
US3542910A (en) * 1966-11-25 1970-11-24 Collagen Corp Method of making fibrous sheet material
US4287252A (en) * 1979-09-28 1981-09-01 Serge Dimiter Reconstituted leather and method of manufacture
US4919189A (en) * 1987-09-21 1990-04-24 Ryobi Ltd. Method of forming as-cast holes by using cores, and apparatus for practicing the method
GB2215658A (en) * 1988-03-17 1989-09-27 Ford Motor Co Manufacture of foamed seat cushions
DE4223703A1 (de) * 1992-07-18 1994-01-20 H P Chemie Pelzer Res & Dev Formteile mit lederartigen Oberflächeneigenschaften

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO03102081A1 *

Also Published As

Publication number Publication date
CN1659236A (zh) 2005-08-24
AU2003238421A1 (en) 2003-12-19
CN1293145C (zh) 2007-01-03
JP2005535792A (ja) 2005-11-24
US20050202268A1 (en) 2005-09-15
WO2003102081A1 (fr) 2003-12-11

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