WO2018087786A1 - Procédé pour permettre la réalisation d'une impression sur une couche de cuir - Google Patents

Procédé pour permettre la réalisation d'une impression sur une couche de cuir Download PDF

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Publication number
WO2018087786A1
WO2018087786A1 PCT/IT2016/000266 IT2016000266W WO2018087786A1 WO 2018087786 A1 WO2018087786 A1 WO 2018087786A1 IT 2016000266 W IT2016000266 W IT 2016000266W WO 2018087786 A1 WO2018087786 A1 WO 2018087786A1
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WO
WIPO (PCT)
Prior art keywords
leather
design
sheet
accordance
laser
Prior art date
Application number
PCT/IT2016/000266
Other languages
English (en)
Inventor
Filippo MACCHIA
Original Assignee
Ballanza S.R.L.
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
Application filed by Ballanza S.R.L. filed Critical Ballanza S.R.L.
Priority to PCT/IT2016/000266 priority Critical patent/WO2018087786A1/fr
Publication of WO2018087786A1 publication Critical patent/WO2018087786A1/fr

Links

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

  • This present invention relates to the technical field of leather manufacturing.
  • the invention relates to an innovative method that enables long-lasting printing on sheets of leather.
  • the outer surface of the leather which is referred to as the "grain" in technical jargon, is particularly smooth, impermeable and oily. These external properties of the leather can be attributable to various reasons including, for example, the processing the leather undergoes in order to create the final product.
  • the scope of this invention is therefore to provide a method for printing or creating a coloured design, if you prefer, on a sheet of leather in a way that resolves the aforementioned technical problems.
  • the aim of this invention is to provide a process that is functional and provides a final product, i.e. the design on the leather, that is long lasting and does not crack when subjected to traction.
  • This method includes the following phases:
  • the technical properties of the underlying layer that is revealed are very different from those of the surface level (referred to as the “grain” in technical jargon) .
  • this underlying layer is not smooth and oily like the external layer, and therefore absorbs the colour much better.
  • the thickness of the layer removed is a criterion that can be varied as needed, depending on the requirements and the desired effect.
  • the indent that is formed when material is removed even becomes imperceptible to the touch as it is actually filled with the colouring itself.
  • the removal of the layer using the laser is preferably preceded by the application of a protective layer over a predetermined area of the sheet of leather, preferably the entire sheet of leather, containing at least the area intended to be lasered and the surrounding area.
  • a light-coloured colouring preferably white
  • a light-coloured colouring preferably white
  • the light colour for example white, creates a neutral base upon which the colours are more intensified, thus preventing unexpected changes to the colour applied. This is because the colour of the leather revealed is particularly dark and may change the actual tone of the colour later applied, thereby creating a final effect that is different from what was intended.
  • FIG. 9 outlines, by comparison, a design to be created using the laser machine that differs from the one to be completed with colouring on the printing machine, in such a way that the electronic files of the two designs are preferably two separate files;
  • Figure 10 shows a summary flow chart.
  • Figure 1 with the number 1, represents a generic sheet of leather whose rectangular shape shown in the illustration is clearly not meant to be limitative.
  • the sheet of leather could be of any size or, obviously, any thickness.
  • Figure 1 depicts a design (specifically of a snake) that you may wish to create on the same sheet.
  • the design is shown in thin lines as during this stage, as outlined below, it has not yet been transferred to the sheet of leather; it is shown in Figure 1 solely to provide an idea of the type of design you may want to create and its position on the sheet.
  • the design can be any shape and size and can depict anything, for example a flower, object or animal.
  • the snake is solely illustrative and not limitative.
  • the protective layer could be a simple paper tape, such as those used in the stationer's or the adhesive ones used for car body repairs.
  • This paper tape is schematically shown in Figure 2 in the form of a roll .
  • the protective sheet must therefore have certain impermeable properties in order to prevent the paint product applied from penetrating and being deposited on the surface of the sheet of leather being protected.
  • Paper tape meets these requirements well and can also be easily removed at the end of the process without leaving any residue.
  • the design can then be created.
  • This design is created using incisions, or by removing material if you prefer, using a Laser 100 machine that emits a laser beam that burns the leather in the targeted zone.
  • the laser is already widely used for other purposes within the field of leather production, for example to create holes in leather according to a predetermined pattern .
  • the machine interfaces with, or is itself equipped with, a computer that acquires a design in electronic form, usually in a CAD format such as ".DXF", to reproduce.
  • a computer that acquires a design in electronic form, usually in a CAD format such as ".DXF", to reproduce.
  • Figure 3 actually shows an example design of a snake that is encoded according to this type of CAD electronic file (or another design software) .
  • this laser beam is moved according to the CAD design inputted into the memory and accurately reproduces the design by making incisions on the leather itself, or by removing an equivalent area.
  • Figure 4 shows the CAD design uploaded to the machine 100 that emits a laser 101 onto sheet 1, laid down on the work surface 102.
  • the system obtains the initial reference coordinates for a launch that positions the laser beam correctly over the sheet.
  • the thickness of the removed layer may vary from a tenth of a millimetre to more, but in any case, must be thinner than the total thickness of the leather being processed. To this effect, this method does not involve through holes being created, but rather a bas-relief design that reveals the underlying layer of the leather, referred to as the "flesh" in technical jargon.
  • section B-B of Figure 7 shows the depth of the incision that actually creates the bas-relief that reveals layer 3, in relation to surface 4.
  • Figure 5 actually shows the snake created by removing a layer of leather in the area marked by the perimeter of the snake itself, thus creating a groove in the shape of a snake.
  • the depth can vary within the design being created.
  • Revealing the underlying layer of the leather ensures that the colour that is then applied is able to fully take as the properties of this underlying layer are very different from those of the leather's external surface .
  • the laser beam will burn the local area, including the tape, overall causing a sort of local incineration of both the tape and the leather to the desired depth.
  • This operation can be completed in various ways, for example by placing the sheet being processed in a sandblasting machine that blasts the sheet with jets of air and grains of sand in order to efficiently clean the surfaces of any residue.
  • the next phase sees the application of a light paint, preferably white, on the lasered area of incision.
  • the protective tape applied previously comes into play as it protects the areas outside of the lasered area from this paint, ensuring that once the tape is removed these areas are intact and are not accidentally marked by the paint applied.
  • a digital printer 200 such as those used to print on T-shirts, for example, is used .
  • the advantage of using a digital printer is that they distribute the colours in line with a predefined programme using an electronic design, in this case usually a ".tif" CAD design.
  • the electronic designs used in the laser machine and in the printer are generally two distinct and separate electronic designs.
  • the sheet of leather is inserted into the printer, which sprays the colour according to the predefined programme within the areas removed and delineated by the electronic design, therefore directly onto the "flesh” that depicts the design (surface 3 of Figure 7) and leaving the “grain” intact (surface 4 of Figure 7) .
  • the light or white colour that was previously applied creates a neutral base on the "flesh", which is generally dark in colour, ensuring that the tone of the colours sprayed is not changed by a dark background.
  • the light or white colour can be applied using either a spraying machine or a brush.
  • the paint will not crack when the leather is subject to traction, and using a digital printer facilitates the production of a high number of items with a high level of reproducibility.
  • a stiffening sheet on the sheet of leather being processed, on the opposite side to the surface on which the bas-relief is being created.
  • This sheet limits the buckling of the surface of the leather being processed, enabling the sheet to stay as straight and flat as possible.
  • the quality of the design and colouring is clearly optimised as the processed surface is kept perfectly flat.
  • the final figure shows a flow chart that summarises the invention's phases.
  • the diagram shows the preparation phase of the electronic design for the laser machine, as well as the design for the printer.
  • Leather is intended to refer to all materials derived from animal hide, also including sole leather.

Abstract

La présente invention concerne un procédé pour créer un motif sur une feuille de cuir, le procédé comprenant les étapes suivantes. Le motif est développé en utilisant un laser pour retirer une couche de surface du cuir, dont l'épaisseur retirée est plus mince que l'épaisseur globale de la feuille de cuir, de façon à révéler une couche sous-jacente du cuir illustrant le motif. La feuille de cuir est préparée dans une machine d'impression numérique qui applique une couleur ou une combinaison de couleurs prédéfinies sur la couche sous-jacente illustrant le motif. Avant que le motif ne soit créé par enlèvement de matière à l'aide d'un laser, une couche de protection est appliquée au moins sur une zone de la feuille de cuir comprenant la zone sur laquelle le motif est créé. Enfin, une coloration claire, de préférence blanche, est appliquée sur la couche de cuir révélée avant l'application de la coloration réelle.
PCT/IT2016/000266 2016-11-14 2016-11-14 Procédé pour permettre la réalisation d'une impression sur une couche de cuir WO2018087786A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/IT2016/000266 WO2018087786A1 (fr) 2016-11-14 2016-11-14 Procédé pour permettre la réalisation d'une impression sur une couche de cuir

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/IT2016/000266 WO2018087786A1 (fr) 2016-11-14 2016-11-14 Procédé pour permettre la réalisation d'une impression sur une couche de cuir

Publications (1)

Publication Number Publication Date
WO2018087786A1 true WO2018087786A1 (fr) 2018-05-17

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IT2016/000266 WO2018087786A1 (fr) 2016-11-14 2016-11-14 Procédé pour permettre la réalisation d'une impression sur une couche de cuir

Country Status (1)

Country Link
WO (1) WO2018087786A1 (fr)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4640529A (en) * 1985-09-16 1987-02-03 Katz Marcella M Flexible non-distortable handcraft sheet material and method of applying printed designs thereto
WO1991016458A1 (fr) * 1990-04-17 1991-10-31 Charron, Jean-Yves Procede et dispositif de realisation d'un dessin en couleur(s) sur un article en cuir
US6022383A (en) * 1994-02-04 2000-02-08 Canon Kabushiki Kaisha Processes for coloring leather by an ink-jet printing method using anionic coloring agents and cationic agents, and leather products obtained therewith
US6140602A (en) * 1997-04-29 2000-10-31 Technolines Llc Marking of fabrics and other materials using a laser
PT103463A (pt) * 2006-04-17 2007-10-31 Joao Matos Gabinete De Modelac Processo de ornamentação de peles através de gravação por laser combinado com pintura por transfer
WO2011019812A1 (fr) * 2009-08-11 2011-02-17 Echelon Laser Systems, Lp Élimination d'une odeur dégagée par la gravure au laser du cuir

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4640529A (en) * 1985-09-16 1987-02-03 Katz Marcella M Flexible non-distortable handcraft sheet material and method of applying printed designs thereto
WO1991016458A1 (fr) * 1990-04-17 1991-10-31 Charron, Jean-Yves Procede et dispositif de realisation d'un dessin en couleur(s) sur un article en cuir
US6022383A (en) * 1994-02-04 2000-02-08 Canon Kabushiki Kaisha Processes for coloring leather by an ink-jet printing method using anionic coloring agents and cationic agents, and leather products obtained therewith
US6140602A (en) * 1997-04-29 2000-10-31 Technolines Llc Marking of fabrics and other materials using a laser
PT103463A (pt) * 2006-04-17 2007-10-31 Joao Matos Gabinete De Modelac Processo de ornamentação de peles através de gravação por laser combinado com pintura por transfer
WO2011019812A1 (fr) * 2009-08-11 2011-02-17 Echelon Laser Systems, Lp Élimination d'une odeur dégagée par la gravure au laser du cuir

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