EP0331214B1 - Cuirs fendus ou matériaux à base de fibres de cuirs - Google Patents

Cuirs fendus ou matériaux à base de fibres de cuirs Download PDF

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Publication number
EP0331214B1
EP0331214B1 EP89109131A EP89109131A EP0331214B1 EP 0331214 B1 EP0331214 B1 EP 0331214B1 EP 89109131 A EP89109131 A EP 89109131A EP 89109131 A EP89109131 A EP 89109131A EP 0331214 B1 EP0331214 B1 EP 0331214B1
Authority
EP
European Patent Office
Prior art keywords
leather
layer
split leather
finish
split
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
Application number
EP89109131A
Other languages
German (de)
English (en)
Other versions
EP0331214A3 (en
EP0331214A2 (fr
Inventor
Philipp Schaeffer
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.)
JH Benecke GmbH
Original Assignee
JH Benecke GmbH
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 DE19843436751 external-priority patent/DE3436751A1/de
Application filed by JH Benecke GmbH filed Critical JH Benecke GmbH
Priority to EP89109131A priority Critical patent/EP0331214B1/fr
Publication of EP0331214A2 publication Critical patent/EP0331214A2/fr
Publication of EP0331214A3 publication Critical patent/EP0331214A3/de
Application granted granted Critical
Publication of EP0331214B1 publication Critical patent/EP0331214B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D1/00—Processes for applying liquids or other fluent materials
    • B05D1/28—Processes for applying liquids or other fluent materials performed by transfer from the surfaces of elements carrying the liquid or other fluent material, e.g. brushes, pads, rollers
    • B05D1/286—Processes for applying liquids or other fluent materials performed by transfer from the surfaces of elements carrying the liquid or other fluent material, e.g. brushes, pads, rollers using a temporary backing to which the coating has been applied
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
    • B05D7/12—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials to leather
    • 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
    • C14B7/02—Composite leathers

Definitions

  • the invention relates to a split leather provided with a finish or a leather fiber material provided with a finish which has depressions and projecting fibers on at least the side provided with the finish, the finish consisting of at least two interconnected layers, of which the The inner, essentially non-thermoplastic layer immediately adjacent to the split leather or leather fiber material is formed from a crosslinkable, preferably polyurethane-containing, plastic dispersion, has a pore or foam structure that absorbs protruding fibers and is preferably thicker than the outer, structured surface Layer consisting of a polyurethane-containing plastic material, optionally a polymer solution.
  • split leather with a finish which has a structured surface, for example a surface structured like a leather grain.
  • a liquid, wet, the dressing-forming mass is applied directly to the top of the split leather, for example by pouring, brushing, plushing, spraying, printing, or by means of a roller application machine and solidifying by drying.
  • the finished split leather In order for the finish to be given a leather-grain-like structured surface, the finished split leather must be embossed in this known method after the liquid dressing composition has dried or after the finish has solidified.
  • This split leather is embossed in an embossing press under the action of heat at very high pressure. This undesirably changes the structure of the split leather and the finish.
  • the trimmed split leather not only becomes thinner, but also harder and stiffer.
  • the existing water vapor permeability of the dressing is reduced or destroyed because the pores present in the dressing are closed or destroyed again during embossing under heat and pressure.
  • thermoplastic materials can be used for the preparation of the dressing, which are deformable under heat and pressure, since otherwise a subsequent stamping of the structured surface in the solidified dressing is not possible.
  • thermoplastics have poorer properties on as not or essentially not thermoplastic.
  • Another disadvantage is that the embossing of the structured surface takes place in a separate work process, i.e. the finished split leather must be treated further, that is, as a rule, inserted manually into an embossing press.
  • a finished split leather in which the finish consists of two layers, namely an inner layer immediately adjacent to the split leather, in which the fibers projecting from the split leather are anchored, and an outer one structured surface layer.
  • a polymer solution containing polyurethane to a structured base made of silicone rubber, which forms the outer layer after it has solidified.
  • a cross-linkable, preferably polyurethane-containing plastic dispersion is then applied to the side of the split leather that has the protruding fibers, whereupon the split leather with the applied plastic dispersion is turned over and placed on the already solidified outer layer on the base. After solidification, the plastic dispersion forms an essentially non-thermoplastic inner layer which has a pore or foam structure and which absorbs the protruding fibers.
  • the structuring of the surface of the outer layer is formed by the correspondingly structured base, so that no subsequent embossing of the finished split leather is required to produce the desired appearance of the surface.
  • the split leather produced in this way provided with a finish, is therefore soft, supple and comes closest in its appearance and properties to the full-grain leather.
  • the present invention has for its object to further improve such split leather or a leather fiber material provided with a finish, in particular with regard to the desired water vapor permeability, tear resistance and tensile strength.
  • the invention proposes that the outer, essentially non-thermoplastic layer is formed from a crosslinkable dispersion or solution, and that in at least one layer, for example a textile material or a non-woven material with a basis weight below 80 g / m2 existing, reinforcement insert is arranged, the gap leather or the leather fiber material together with the dressing has a water vapor permeability of more than 0.3 mg / cm2 h.
  • the arrangement of the reinforcing insert increases the water vapor permeability of the finish in the desired manner, so that the split leather according to the invention, provided with a finish, or the leather fiber material according to the invention has a water vapor permeability of more than 0.3 mg / cm 2 h.
  • This water vapor permeability is measured in accordance with JUP 15, this is the European test specification for water vapor permeability in leather.
  • the reinforcing insert acts as a reinforcement, prevents excessive expansion and thus destruction of the finish due to tensile stress, and increases the tear resistance, so that split leather or leather fiber materials of lower quality, in particular low tear resistance, can also be used.
  • the reinforcing insert prevents the structure of the same from being undesirably apparent when stretched on the dressing when split leather or leather fiber materials with an uneven surface are used.
  • aqueous plastic dispersion is understood to mean highly polymeric plastics which contain water or are dispersed in water and which form films by removing the water, for example by evaporation, preferably with the supply of heat.
  • plastic solution is understood to mean high-polymer plastics dissolved in a solvent which, when sprayed or brushed on, form films which solidify as a result of solvent removal, for example by evaporation of the solvent.
  • the inner layer or the like compared to the split leather. and to be color neutral with respect to the outer layer and to embed pigments and / or dyes in the outer layer which determine the color of the finish.
  • the color-neutral inner layer can have a milky appearance, for example. This has the advantage that if the color of the dressing is to be changed, only the aqueous plastic dispersion or liquid plastic solution forming the outer layer has to be replaced by another one or the Application device for this plastic dispersion or plastic solution must be replaced.
  • the color-neutral design of the inner layer further ensures that an existing coloring of the leather, which is provided with the finish, is not visible on the top of the finish, even if heavily colored leather is used.
  • the inner layer has a pore or foam structure which has the required softness and suppleness of the split leather or the like provided with a finish. guaranteed.
  • the outer layer on the other hand, has to be harder to withstand mechanical loads.
  • the inner layer therefore expediently has a density between 0.6 and 0.8 and the outer layer has a density between 0.82 and 1.24.
  • the inner layer is thicker than the outer layer.
  • the inner layer then securely picks up all the fibers protruding from the leather and fills all the depressions in the leather, so it is then not necessary for the outer layer, which is preferably provided with the pigmentation, to be very thick.
  • the thickness of the inner layer is expediently more than 0.11 mm, preferably more than 0.21 mm, whereas the thickness of the outer layer is less than 0.16 mm, preferably less than 0.10 mm.
  • hollow microspheres with a diameter of 0.008 to 0.10 mm can be embedded at least in this inner layer, the thin shell of which consists of thermoplastic material, preferably of vinylidene chloride copolymer.
  • thermoplastic material preferably of vinylidene chloride copolymer.
  • Such hollow microspheres are known per se. Optimal results are achieved if the inner layer contains more than 8 vol .-% hollow microspheres.
  • an additional thin finish layer for example a layer which influences the gloss or the color, can be arranged on this surface.
  • This additional layer does not in itself form a direct component of the dressing, which is only made up of two layers, and the thickness of this additional finishing layer which is only applied later is therefore also not to be attributed to the thickness of the dressing.
  • the textured surface of the outer layer can, if desired, have a leather grain-like appearance or the appearance of a fine-sanded one have full-grain leather, in the latter case there is a velor effect.
  • a further improvement in water vapor permeability and an increase in the softness and suppleness of the split leather or the like provided with a finish. can be achieved by at least the outer layer of the finest cellulose particles or heat sensitive substances, e.g. Polyvinyl methyl ether, preferably in an amount of less than 6 wt .-%, based on the solids content of the aqueous plastic dispersion or liquid plastic solution.
  • Polyvinyl methyl ether is soluble in cold water, but coagulates when heated, which results in the desired improvement in the foam structure and thus in the water vapor permeability of the dressing.
  • the split leather 13 is provided on one side with a finish 14 which consists of an inner layer 14a which completely absorbs the fibers 17 protruding from the split leather 13 and an outer layer 14b which is provided with a structure on its surface and therefore has a leather-like appearance. Hollow microspheres 15 are embedded in the inner layer 14a, through which this inner layer contains a pore or foam structure.
  • the inner layer 14a is also color neutral and contains no pigments or dyes.
  • the outer layer 14b which is considerably thinner than the inner layer 14a, does not have hollow microspheres, but instead has such a proportion of pigments or dyes that the coloring of the finish is determined thereby.
  • a reinforcement insert (not shown) is arranged in at least one layer 14a or 14b and consists, for example, of a textile material or of a nonwoven material with a weight per unit area of less than 80 g / m 2.
  • This reinforcing insert increases the water vapor permeability of the finished split leather, improves the tensile and tear strength of the finished split leather and prevents the troubled, finished top of the split leather from becoming visible on the surface of the finish when stretched.
  • a split leather prepared according to the invention which is comparable in its appearance and properties to a full-grain natural leather of the same type and thickness, is produced as follows:
  • a two-layer silicone base which is reinforced by means of an asbestos fabric insert, is placed on an assembly line and heated to about 85 ° C. on this assembly line by means of infrared rays.
  • the silicone pad has a size of 2.4 m2 and a thickness of approx. 3 mm.
  • An aqueous dispersion containing approximately 45% solids is applied to the approximately 85 ° C silicone base by pouring.
  • the dispersion contains approx. 40% polyurethane and approx. 5% white pigment and has a viscosity of approx. 60 seconds (the viscosity is determined in the Ford cup with a 4 mm nozzle).
  • the wet dispersion is applied to the warm base in a thickness of approximately 0.11 mm, the thickening and subsequent solidification of this dispersion taking place immediately after striking the base by water evaporation.
  • the base has a structured top side, so that when this layer containing the pigment solidifies, the scar structure of the dressing that is later visible forms at the same time.
  • the solidified outer layer has a thickness of approx. 0.06 mm.
  • the polyurethane dispersion forms a film with a hardness of approx. 90 Shore A.
  • the base moves on a conveyor belt at a speed of 4.5 m / min. 8 meters after pouring on the dispersion containing the pigment, split leather, to which an aqueous plastic dispersion had previously been applied, is placed with the wet side on the pre-dried layer of the base containing the pigment.
  • the split leather has a size of approx. 1.3 m2 and a thickness of 1.4 mm and has a bright chrome-green color.
  • the dispersion applied to the split leather is a polyurethane dispersion that contains approx. 62% solids. These solids essentially consist of 50% polyurethane and 10% hollow microspheres as well as a thickener.
  • the aqueous dispersion has a viscosity of approx. 280 seconds (measured in a Ford cup with a 4 mm nozzle) and dries to a film with a hardness of approx. 65 Shore A and a density of approx. 0.78.
  • the relatively viscous dispersion was applied to the split leather by means of a roller which rotates in the opposite direction to the direction of movement of the leather, so that the dispersion underneath Exploitation of the shear forces is massaged into the leather and essentially fills all cavities between the protruding fibers. Due to the different lengths of the protruding fibers of the leather, the layer thickness cannot be determined.
  • the application weight of the wet dispersion was approx. 240 g / m2.
  • the leather After the leather is placed on the solidified pigment layer on the base, this leather is pressed onto the base by a soft, elastic roller covered with silicone, whereby any air pockets between the pigment layer and the wet plastic dispersion applied to the leather can escape.
  • the leather provided with the dressing and placed on the base is brought together with the base into a warm vacuum device which is provided with a membrane, a vacuum being generated below the membrane, so that the membrane lowers and against the Leather presses.
  • the membrane adapts to the contours of the leather and presses it onto the base.
  • the gases and water vapors generated by the heating of the vacuum device are extracted via the vacuum line.
  • the finished leather can be removed from the vacuum device. During this time, the vacuum device has moved on, so that continuous production takes place.
  • a split leather with a grained, particularly abrasion-resistant finish is produced as follows:
  • a highly viscous polyurethane solution in a layer thickness of approx. 0.13 mm is applied to a paper carrier with a negative grain structure and a surface finish that enables a solidified polyurethane film to be removed.
  • the polyurethane solution essentially contains 38% polyurethane and 3% brown pigment as solids.
  • the solution dries to a film with a density of approx. 1.05, which then has a hardness of approx. 98 Shore A.
  • This pigment layer is prefabricated on the paper base, so the paper base can be kept in stock together with the pigment layer until it is used.
  • the paper carrier In the manufacture of the preparation of a split leather, the paper carrier is placed on a base, for example a conveyor belt, and moves in the direction of the transfer point of the leather provided with the wet plastic dispersion, where the leather with its wet side is placed on the pigment layer of the paper support.
  • the aqueous plastic dispersion applied to the leather is pigment-free and has a milky appearance.
  • the paper web with the leather placed on it then runs under the application device for applying the aqueous plastic dispersion onto the leather to a pair of rollers, where it is pressed on.
  • composition and amount of the aqueous dispersion layer applied to the leather corresponds to that in Example 1.
  • the paper base with the split leather on it is taken over by a heated endless steel belt, which has a length of more than 12 meters and a width of more than 1.2 meters, and is transported through it in such a way that in those places where the leather lies on the paper web, a rubber cover acting as a membrane with a sealing frame and a valve-provided opening for connection to a vacuum source is placed on the leather so that it covers the leather. Then the air is sucked out below the rubber cover, so that the membrane presses against the leather due to the resulting negative pressure and presses the leather onto the paper or onto the steel band.
  • the steel strip is heated to a temperature between 70 and 140 ° C by illuminating the underside of the steel strip using infrared radiators.
  • the valve is opened 60 seconds after the vacuum is applied and the rubber cover takes on its original shape due to its elastic properties. After removing the rubber cover, the finished leather can be peeled off the paper.
  • the longitudinal and transverse grooves provided in the rubber cover ensure that the gases and water vapor can escape from the leather even when the membrane is pressed onto the leather by the vacuum.

Claims (10)

1. Cuir refendu (13) ou matière en fibres de cuir pourvue d'un revêtement (14) qui présente des enfoncements et des fibres en saillie, du moins sur la face pourvue du revêtement, le revêtement (14) se composant de deux couches (14a, 14b) reliées entre elles, parmi lesquelles la couche intérieure (14a), laquelle est immédiatement contiguë au cuir refendu (13) ou à la matière en fibres de cuir et n'est pas thermoplastique pour l'essentiel, est constituée par une dispersion réticulable de matière plastique contenant de préférence du polyuréthane, présente une structure poreuse ou en forme de mousse, respectivement, et reçoit les fibres en saillie (17) en étant de préférence plus épaisse que la couche extérieure (14b) qui présente une surface texturée et qui est constituée par une matière plastique contenant du polyuréthane, le cas échéant par une solution de polymère, caractérisé par le fait que la couche extérieure (14b), pour l'essentiel non thermoplastique, est constituée par une dispersion ou une solution réticulable, et par le fait qu'un renforcement intérieur, lequel est constitué par exemple par un matériau textile ou par un feutrage dont le poids par unité de surface est inférieur à 80 g/m², est disposé dans une couche (14a, 14b) au moins, le cuir refendu ou la matière en fibres de cuir, respectivement, présentant avec le revêtement une perméabilité à la vapeur d'eau supérieure à 0,3 mg/cm².h.
2. Cuir refendu ou similaire selon la revendication 1, caractérisé par le fait que la couche intérieure (14a) est réalisée en étant de couleur neutre par rapport au cuir refendu ou similaire (13) et par rapport à la couche extérieure (14b), et par le fait que des pigments et/ou des colorants qui déterminent la couleur du revêtement sont noyés dans la couche extérieure (14b).
3. Cuir refendu ou similaire selon la revendication 1, caractérisé par le fait que la couche intérieure (14a) présente une densité comprise entre 0,6 et 0,8.
4. Cuir refendu ou similaire selon la revendication 1, caractérisé par le fait que la couche extérieure (14b) présente une densité comprise entre 0,82 et 1,24.
5. Cuir refendu ou similaire selon la revendication 1, caractérisé par le fait que l'épaisseur de la couche intérieure (14a), avec les fibres (17) qui y sont noyées, s'élève à plus de 0,11 mm, et de préférence à plus de 0,21 mm.
6. Cuir refendu ou similaire selon la revendication 1, caractérisé par le fait que l'épaisseur de la couche extérieure (14b) s'élève à moins de 0,16 mm, et de préférence à moins de 0,10 mm.
7. Cuir refendu ou similaire selon l'une des revendications 1 à 6, caractérisé par le fait que des microbilles creuses d'un diamètre de 0,008 à 0,10 mm sont noyées au moins dans la couche intérieure (14a), leur enveloppe mince étant constituée par une matière thermoplastique, de préférence par un copolymère de chlorure de vinylidène.
8. Cuir refendu ou similaire selon l'une des revendications 1 à 7, caractérisé par le fait qu'une couche mince supplémentaire de finition, comme par exemple une couche qui influence le brillant ou la couleur, est disposée sur la surface de la couche extérieure (14b) qui est munie d'une texture.
9. Cuir refendu ou similaire selon l'une des revendications 1 à 8, caractérisé par le fait que la surface texturée (16) de la couche extérieure (14b) présente un aspect analogue à celui de la fleur de cuir ou l'aspect d'un cuir de pleine fleur finement poli.
10. Cuir refendu ou similaire selon l'une des revendications 1 à 9, caractérisé par le fait qu'au moins la couche extérieure (14b) contient de très fines particules de cellulose ou des substances sensibles à la chaleur, comme par exemple du polyvinylméthyléther.
EP89109131A 1984-10-06 1985-10-07 Cuirs fendus ou matériaux à base de fibres de cuirs Expired - Lifetime EP0331214B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP89109131A EP0331214B1 (fr) 1984-10-06 1985-10-07 Cuirs fendus ou matériaux à base de fibres de cuirs

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19843436751 DE3436751A1 (de) 1984-10-06 1984-10-06 Verfahren zum umdrehen eines spaltleders bei seiner zurichtung, sowie eine vorrichtung zum umdrehen eines spaltleders und ein nach dem verfahren zugerichtetes spaltleder
DE3436751 1984-10-06
EP89109131A EP0331214B1 (fr) 1984-10-06 1985-10-07 Cuirs fendus ou matériaux à base de fibres de cuirs

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
EP85890249.7 Division 1985-10-07

Publications (3)

Publication Number Publication Date
EP0331214A2 EP0331214A2 (fr) 1989-09-06
EP0331214A3 EP0331214A3 (en) 1989-09-13
EP0331214B1 true EP0331214B1 (fr) 1991-10-16

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Family Applications (1)

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EP89109131A Expired - Lifetime EP0331214B1 (fr) 1984-10-06 1985-10-07 Cuirs fendus ou matériaux à base de fibres de cuirs

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EP (1) EP0331214B1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102018203297B4 (de) 2018-03-06 2024-03-14 Adidas Ag Beschichtetes Schuhoberteil

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE1003652A3 (nl) * 1989-11-24 1992-05-12 Glorieux Hugo Albert Maurits Flexibele samenstelling op basis van een bindmiddel en ten minste een vulstof.
DE9405340U1 (de) * 1994-03-29 1994-05-26 Schaefer Philipp Mit einer Zurichtung versehenes Leder
WO1995034609A1 (fr) * 1994-06-14 1995-12-21 Gateway Technologies, Inc. Revetement pour tissus ayant la capacite d'absorber l'energie et procede de fabrication de ce revetement
AT4947U3 (de) * 2001-10-04 2002-06-25 Schaefer Philipp Vollnarbiges rindnappaleder und verfahren zur herstellung desselben
WO2007054987A1 (fr) * 2005-11-14 2007-05-18 Fabio Valle Cuir reflechissant et articles d'habillement, chaussures, accessoires, garnitures de cuir et produits globalement realises en cuir reflechissant
AT512135B1 (de) 2011-09-28 2013-12-15 Wollsdorf Leder Schmidt & Co Ges M B H Leder mit textil/vliesschicht auf der nabenseite
ITVI20120106A1 (it) * 2012-05-08 2013-11-09 Scamosceria Astico S P A Metodo per la finitura superficiale di pelli e similari e prodotto semilavorato ottenibile con il metodo
AT512998B1 (de) * 2012-05-29 2014-08-15 Wollsdorf Leder Schmidt & Co Ges M B H Herstellungsverfahren zur Herstellung von Leder mit zumindest einer Textil/Vliesschicht

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3229150C2 (de) * 1982-08-04 1986-04-10 Helmut 6780 Pirmasens Schaefer Verfahren und Vorrichtung zum Zurichten von Spaltleder
DE3309992A1 (de) * 1983-03-19 1984-09-20 Bayer Ag, 5090 Leverkusen Verfahren zum beschichten von (spalt)leder

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102018203297B4 (de) 2018-03-06 2024-03-14 Adidas Ag Beschichtetes Schuhoberteil

Also Published As

Publication number Publication date
EP0331214A3 (en) 1989-09-13
EP0331214A2 (fr) 1989-09-06

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