EP0757724B1 - Verfahren zur erzeugung von reliefmustern auf leder oder dergleichem - Google Patents

Verfahren zur erzeugung von reliefmustern auf leder oder dergleichem Download PDF

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Publication number
EP0757724B1
EP0757724B1 EP95918640A EP95918640A EP0757724B1 EP 0757724 B1 EP0757724 B1 EP 0757724B1 EP 95918640 A EP95918640 A EP 95918640A EP 95918640 A EP95918640 A EP 95918640A EP 0757724 B1 EP0757724 B1 EP 0757724B1
Authority
EP
European Patent Office
Prior art keywords
leather
sheet
press
relief
thermo
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
EP95918640A
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English (en)
French (fr)
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EP0757724A1 (de
Inventor
Jean-Pierre Breal
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Individual
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Individual
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Classifications

    • 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
    • C14B1/00—Manufacture of leather; Machines or devices therefor
    • C14B1/44—Mechanical treatment of leather surfaces
    • C14B1/56—Ornamenting, producing designs, embossing

Definitions

  • the present invention relates to a method of production of relief patterns on leather or any other material of a similar nature, such as imitation leather, plastic, etc ...
  • this process consists of heating and compressing in a press a multi-layer assembly comprising a leather sheet, a thermoformable material and possibly a sheet of protection, the leather sheet being placed against a press plate whose surface has parts in hollow inside which the leather is repelled by the thermoformable material when the multilayer assembly is hot compressed.
  • the leather sheet that is placed against the etched surface is softened by heat, then pushed back into the recessed parts of the engraved surface by the thermoformable material which "flows" in a plane parallel to the press plate between the parties in relief and the hollow parts thereof.
  • the process illustrated in the aforementioned document allows on the one hand to use additional sheets of leather thinner than those used in the process old press stamping and secondly reduce the compression force exerted by the press, which allows reduce raw material and tool costs.
  • the pressure exerted by the thermoformable material on the leather sheet is never perfectly regular and is found to be significantly lower in contour zones of the relief patterns produced, which leads to a relative imprecision in the formation of these contours.
  • This imprecision in highlighting the sheet of leather can be extremely penalizing, in particular if you want to print a design on the leather monochrome or polychrome in correspondence with the motif in relief made.
  • the object of the present invention is to remedy to these drawbacks by proposing a method of making very fine relief patterns on leather or similar, even if the leather sheet concerned is very slim.
  • step a) the glue thermoformable provided for in step a) is associated with an agent thermo-expansive and that, in step c), the temperature and the pressure are chosen so that the intermediate layer deforms plastically by swelling through the action of the heat-expanding agent to repel the sheet of leather in the recessed parts of the engraved surface.
  • the sheet of leather that is placed against the etched surface is softened by heat, then pushed back into the recessed parts of the engraved surface by the intermediate layer which, placed between the sheet of leather and protective sheet, swells under the effect of heat thanks to its thermo-expansive agent to repel evenly the leather sheet inside the parts hollow.
  • the distribution of the pressure exerted by the middle layer on the leather sheet is perfectly regular, so that the leather sheet hugs faithfully the recessed and raised parts of the surface engraved, especially in the angular contour areas of this one.
  • thermoformable adhesive is a glue based on polyurethane or acrylic polymer in phase aqueous or solvent.
  • the heat-expanding agent includes explosive gas micro-balls, for example micro-balls of air.
  • the heating temperature during step C) is at least equal to 140 ° C., and preferably of around 150 ° C.
  • the engraved surface against which is applied the leather sheet is advantageously made on a copper plate attached to one of the trays of the hurry.
  • a copper plate allows achieve good precision etching and therefore obtain an embossed pattern of optimum finesse.
  • a sheet of silicone paper bearing a drawing intended to be transferred to the sheet between the leather sheet and the surface engraved is engraved.
  • the process for producing relief patterns on leather or the like according to the invention comprises different steps described below with reference to the figures.
  • a first step is to make a set 1 multilayer comprising a sheet of leather 3, a protective sheet 5 and an intermediate layer 6 arranged between sheets 3 and 5 and comprising an adhesive thermo-formable associated with a thermo-expanding agent.
  • the leather used for sheet 3 is leather thin, between 0.6 and 1mm thick, having undergone preferably chrome tanning and retanning, followed by filling with oil and, optionally, a dyeing.
  • the protective sheet 5 can be formed by a strong linen type canvas, cotton, acetate or triacetate, or be made up of a sheet of leather. Linen in particular constitutes a noble support suitable for leather and very resistant to heat and aging. For optimum flexibility, especially in the area of clothing, we prefer a mesh fabric.
  • thermoformable glue used in the constitution of the intermediate layer 6 provides a connection between sheets 3 and 5 and can be hot molded.
  • This glue can be constituted by a thermo-glue cold printed on the canvas 5 such as a base adhesive polyurethane or acrylic polymer in aqueous phase or solvent. You can also use solvent such as polyamide plastisoles, commonly used in the field of textiles. She is mingled with a heat-expanding agent such as gas micro-beads explosives.
  • the multilayer assembly thus produced is placed in a press having a tray upper 7 heated against which the canvas is applied 5 and a lower plate 8 covered with a thickness of silicone foam 9 forming a support for a plate 10 with an engraved upper surface 11.
  • the assembly multilayer 1 is arranged so that the sheet of leather 3 is applied against the engraved surface 11 of the plate 10.
  • the etching of this surface is previously made so that the recessed portions 13 of this surface correspond to the raised parts of the pattern that we want to get on the leather sheet.
  • the plate 10 is preferably made of copper, the material best suited for making engravings and allowing the obtaining of a motif of a optimal finesse.
  • This plate can be made by a traditional print system in which a drawing is made by the artist directly on the plate with a protective varnish (or possibly by photoengraving), the plate then being hollowed out by immersion in an agent attacking agent, such as iron perchloride or acid nitric. The depth of the hollows is made according to that of the desired reliefs on the leather.
  • the press used in the context of the invention can be a simple transfer press of the type of those used in screen printing, adjustable in temperature, heating and pressure. Such a press is directly commercially available and low cost.
  • a third step is to compress hot the multilayer assembly 1 in the press, as illustrated by Figure 4.
  • the leather sheet 3, which is placed against the etched surface 11, is softened by the heat and water vapor from the mixture, and is pushed back into the recessed parts 13 of the etched surface 11, under the effect dynamics of the swelling of the thermo-expanding agent.
  • the press force exerted by the press is very low next to that required for conventional stamping and even compared to that necessary for the implementation of the known process using a thermoformable material without thermo-expanding agent.
  • the thermo-expanding agent used in the process of the invention exercises by itself and uniformly a pressure which repels the leaf of leather against the engraved surface. We thus obtain a leather sheet with very fine relief patterns, the raised parts having a drawn outline of very clearly.
  • the heating temperature can theoretically vary between 100 ° C and 200 ° C, but will most often be at less than 140 ° C, a minimum heating time being necessary to allow complete transmission of the heat to the multilayer assembly 1. Time and heating temperature depends on the type of glue thermo-formable and thermo-expanding agent used, leather and the nature of the plate 10. In practice, for a 1mm thick leather sheet placed between a copper plate, a material that conducts well heat, and a polyurethane adhesive containing an agent thermo-expansive of the micro-ball type of explosive gases, the heating temperature is around 150 ° C with a hold for one minute.
  • a final step is to identify press and allow the relief assembly to cool as well got.
  • the fabric 5 gives the multilayer assembly 1 a capacity of resistance to stretching to avoid elongation of this set which would cause a mitigation of landforms.
  • the final product obtained although having was made from a sheet of weak leather thickness, i.e. low cost, has the appearance thick leather, both tactile than at the level of its mechanical behavior.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Treatment And Processing Of Natural Fur Or Leather (AREA)
  • Laminated Bodies (AREA)
  • Synthetic Leather, Interior Materials Or Flexible Sheet Materials (AREA)

Claims (9)

  1. Verfahren zum Erzeugen von Reliefmustern auf Leder oder dergleichen, umfassend die folgenden Schritte:
    a) man erzeugt eine Mehrlagenanordnung (1) mit einer Lederbahn (3) oder dergleichen, einer Schutzfolie (5) und einer Zwischenschicht (6), die zwischen diesen Lagen angeordnet ist und einen warmverformbaren Klebstoff trägt,
    b) die so angeordnete Mehrlagenanordnung (1) wird in eine Presse eingelegt, deren eine Platte eine gravierte Fläche (11) hat, an der die Lederbahn (3) der Anordnung anliegt, wobei die Gravur dieser Fläche vorher entsprechend dem gewünschten Muster so hergestellt wurde, daß die hohlen Abschnitte (13) der gravierten Fläche (11) den Abschnitten des auf der Lederbahn (3) zu erzeugenden Reliefmusters entsprechen,
    c) die Mehrlagenanordnung (1) wird in der Presse erwärmt und gepreßt,
    d) die so erhaltene, mit Relief versehene Anordnung wird aus der Presse genommen,
    dadurch gekennzeichnet, daß der in Schritt a) vorgesehene warmverformbare Klebstoff mit einem warmexpandierenden Stoff verbunden ist und daß während des Schrittes c) die Temperatur und der Druck so gewählt werden, daß die Zwischenschicht (6) sich plastisch verformt und sich dabei unter der Wirkung des warmexpandierenden Stoffes ausdehnt, um die Lederbahn (3) in die hohlen Abschnitte (13) der gravierten Fläche (11) zu drücken.
  2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß der warmverformbare Klebstoff (6) ein Klebstoff auf der Basis eines Polyurethanpolymers oder Acrylpolymers ist, das in wässriger Phase oder als Lösung vorliegt.
  3. Verfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß der warmexpandierende Stoff explosive Gasmikrokügelchen enthält.
  4. Verfahren nach einem der vorangegangenen Ansprüche, dadurch gekennzeichnet, daß die Heiztemperatur während des Schrittes c) mindestens 140° C und vorzugsweise in der Größenordnung von 150° C beträgt.
  5. Verfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß die gravierte Fläche (11), an welcher die Lederbahn (3) anliegt, an einer Kupferplatte (10) ausgebildet ist, die an einer der Platten der Presse befestigt ist.
  6. Verfahren nach einem der vorangegangenen Ansprüche, dadurch gekennzeichnet, daß ein Blatt aus Silikonpapier mit der auf die Lederbahn (3) zu übertragenden Zeichnung zwischen der Lederbahn (3) und der gravierten Fläche (11) angeordnet wird.
  7. Verfahren nach einem der vorangegangenen Ansprüche, dadurch gekennzeichnet, daß die Presse eine Übertragungspresse ist, wie sie beim Siebdruck verwendet wird.
  8. Verfahren nach einem der vorangegangenen Ansprüche, dadurch gekennzeichnet, daß die Schutzfolie (5) von einem Leinentuch gebildet ist.
  9. Verfahren nach einem der Ansprüche 1 bis 7, dadurch gekennzeichnet, daß die Schutzfolie (5) von einer Lederbahn gebildet ist.
EP95918640A 1994-04-27 1995-04-25 Verfahren zur erzeugung von reliefmustern auf leder oder dergleichem Expired - Lifetime EP0757724B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR9405099 1994-04-27
FR9405099A FR2719317B1 (fr) 1994-04-27 1994-04-27 Procédé de réalisation de motifs en relief sur du cuir ou analogue.
PCT/FR1995/000541 WO1995029262A1 (fr) 1994-04-27 1995-04-25 Procede de realisation de motifs en relief sur du cuir ou analogue

Publications (2)

Publication Number Publication Date
EP0757724A1 EP0757724A1 (de) 1997-02-12
EP0757724B1 true EP0757724B1 (de) 1998-04-08

Family

ID=9462572

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95918640A Expired - Lifetime EP0757724B1 (de) 1994-04-27 1995-04-25 Verfahren zur erzeugung von reliefmustern auf leder oder dergleichem

Country Status (5)

Country Link
EP (1) EP0757724B1 (de)
DE (1) DE69502018T2 (de)
ES (1) ES2116085T3 (de)
FR (1) FR2719317B1 (de)
WO (1) WO1995029262A1 (de)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2153280B1 (es) * 1998-06-05 2001-10-16 Bonete Irles Francisco Jose Procedimiento de formacion de apliques para calzado, confeccion, bolsos, marroquineria, juguetes y articulos similares.
DE102004039956A1 (de) * 2004-08-18 2006-02-23 Adam Opel Ag Verfahren zum Strukturieren von Materialien mittlerer Festigkeit
FR2881376B1 (fr) * 2005-02-02 2007-04-06 Jean Pierre Breal Procede d'impression d'un motif sur une surface imprimee d'un tel motif
CN112375852A (zh) * 2020-10-30 2021-02-19 娄底光华机械设备制造有限公司 一种机械领域的皮革自动挤压设备

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2652352A (en) * 1948-07-28 1953-09-15 Alan E Murray Process of making embossed article and product thereof
FR2236658A1 (en) * 1973-07-02 1975-02-07 Usm France Embossing flexible goods using thermoplastic layer - below (leather) surface, retaining original appearance and feel
IT1216316B (it) * 1986-08-01 1990-02-22 Nello Galvani Procedimento industriale per ottenere bassorilievi su pelle e/o tela jeans

Also Published As

Publication number Publication date
FR2719317B1 (fr) 1996-07-05
DE69502018D1 (de) 1998-05-14
FR2719317A1 (fr) 1995-11-03
ES2116085T3 (es) 1998-07-01
EP0757724A1 (de) 1997-02-12
DE69502018T2 (de) 1998-10-29
WO1995029262A1 (fr) 1995-11-02

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