EP4273270A1 - Station de prétraitement au plasma du cuir, et système de traitement du cuir comprenant une telle station et procédé de traitement de celui-ci - Google Patents

Station de prétraitement au plasma du cuir, et système de traitement du cuir comprenant une telle station et procédé de traitement de celui-ci Download PDF

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Publication number
EP4273270A1
EP4273270A1 EP23170019.6A EP23170019A EP4273270A1 EP 4273270 A1 EP4273270 A1 EP 4273270A1 EP 23170019 A EP23170019 A EP 23170019A EP 4273270 A1 EP4273270 A1 EP 4273270A1
Authority
EP
European Patent Office
Prior art keywords
leather
station
treatment
axis
advancement
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.)
Pending
Application number
EP23170019.6A
Other languages
German (de)
English (en)
Inventor
Giorgio TODESCO
Paolo TODESCO
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.)
Todesco Srl
Original Assignee
Todesco Srl
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 Todesco Srl filed Critical Todesco Srl
Publication of EP4273270A1 publication Critical patent/EP4273270A1/fr
Pending legal-status Critical Current

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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
    • 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
    • C14C15/00—Apparatus for chemical treatment or washing of hides, skins, or leather
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06P—DYEING OR PRINTING TEXTILES; DYEING LEATHER, FURS OR SOLID MACROMOLECULAR SUBSTANCES IN ANY FORM
    • D06P3/00—Special processes of dyeing or printing textiles, or dyeing leather, furs, or solid macromolecular substances in any form, classified according to the material treated
    • D06P3/02—Material containing basic nitrogen
    • D06P3/04—Material containing basic nitrogen containing amide groups
    • D06P3/32—Material containing basic nitrogen containing amide groups leather skins
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06P—DYEING OR PRINTING TEXTILES; DYEING LEATHER, FURS OR SOLID MACROMOLECULAR SUBSTANCES IN ANY FORM
    • D06P5/00—Other features in dyeing or printing textiles, or dyeing leather, furs, or solid macromolecular substances in any form
    • D06P5/20—Physical treatments affecting dyeing, e.g. ultrasonic or electric
    • D06P5/2011—Application of vibrations, pulses or waves for non-thermic purposes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B13/00—Machines or plants for applying liquids or other fluent materials to surfaces of objects or other work by spraying, not covered by groups B05B1/00 - B05B11/00
    • B05B13/02—Means for supporting work; Arrangement or mounting of spray heads; Adaptation or arrangement of means for feeding work
    • B05B13/04—Means for supporting work; Arrangement or mounting of spray heads; Adaptation or arrangement of means for feeding work the spray heads being moved during spraying operation
    • B05B13/0463—Installation or apparatus for applying liquid or other fluent material to moving work of indefinite length
    • B05B13/0484—Installation or apparatus for applying liquid or other fluent material to moving work of indefinite length with spray heads having a circular motion, e.g. being attached to a rotating supporting element
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06B—TREATING TEXTILE MATERIALS USING LIQUIDS, GASES OR VAPOURS
    • D06B13/00—Treatment of textile materials with liquids, gases or vapours with aid of vibration
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05H—PLASMA TECHNIQUE; PRODUCTION OF ACCELERATED ELECTRICALLY-CHARGED PARTICLES OR OF NEUTRONS; PRODUCTION OR ACCELERATION OF NEUTRAL MOLECULAR OR ATOMIC BEAMS
    • H05H2245/00—Applications of plasma devices
    • H05H2245/40—Surface treatments
    • H05H2245/42—Coating or etching of large items

Definitions

  • the present invention generally relates to the technical field of methods for processing animal leather or leather of animal origin or at least partially synthetic leather and in particular it relates to processes subsequent to tanning, for example in refining processes. Therefore, the present invention relates to a station for the plasma pre-treatment of leather, as well as a system for processing leather which includes such station and a method for processing the latter.
  • the expression “hide” or “leather” is used to indicate any layer, whether it be grain, crust or sub-crust, of the leather of an animal, in particular of a bovine, but also of sheep/goats, exotic, fur, wild animals or others.
  • the expression “a leather” or “the leather” is used to indicate at least one part of the leather of a single animal, which may therefore be of any shape.
  • the leather may be whole leather, half leather, shoulders, hunch, back, hips, rear or front parts of the body.
  • animal leather or leather of animal origin is used to indicate the so-called “genuine leather”, the so-called “leatherette” or “faux leather” or other similar composite products containing animal leather.
  • the expression "diffuse coating” is used to indicate deposition of one or more layers of dye coating in a diffused and homogeneous manner on the leather, by spraying using appropriate nozzles or guns or using roller machines, spreading machines or buffer machines.
  • the expression "preparation” or derivatives thereof is used to indicate the provision of an element of interest to a process step of interest, thus including any preventive treatment aimed at the optimal execution of the step of interest, from simple collection and possible storage to heat and/or chemical and/or physical pre-treatments and the like.
  • pre-treatment or derivatives relating to an animal leather or leather of animal origin or at least partially synthetic leather, is used to indicate the preliminary treatment carried out thereon before the subsequent and more important processing stages are carried out.
  • the expression "torch” or the like is used to indicate a device which generates a direct flow of plasma from a nozzle following the application of an appropriate potential difference between two electrodes.
  • contact angle is used to indicate the thermodynamic quantity to determine the wettability of a surface, defined by the angle comprised between the direction of the solid-liquid tension and the direction of the liquidvapour tension, tangent to the outer surface of the drop, with the vertex in the liquid-solid-vapour three-phase point, according to the UNI EN 828:2013 standard.
  • the expression "cold plasma” or derivatives is used to indicate a type of plasma in which the electrons are not in thermodynamic equilibrium with the other species, given that they are characterised by a much higher temperature with respect to that of the heavier species (ions and neutral species).
  • the energy of the electrons may be described by using probability distribution functions, such as for example Maxwell or Druyvesteyn distributions.
  • Plants for processing leather which include - in succession - several stations, including a station for the diffuse coating animal leather, are known.
  • the leather is loaded at the inlet of the system and transported using conveyors in series which move it along the subsequent processing stations.
  • the impermeability of leather together with the diffuse coating treatment lead to a surface deposition of paint, entailing a high use of the latter and a consistent stationing of the leather in the coating station given that there are required multiple passes on the same leather portion in order to create a complete and uniform spreading thereof.
  • An object of the present invention is to at least partly overcome the drawbacks illustrated above by providing a particularly functional station for the pre-treatment of leather.
  • a further object of the present invention is to provide a station which allows a coating of the leather with low amount of paint.
  • Another object of the present invention is to provide a station which allows a coating of the leather with significant saving of time.
  • Another object of the present invention is to provide a system for processing leather that is highly functional.
  • Another object of the invention is to provide a method for processing leather that is particularly quick.
  • the system I may therefore comprise one or more processing stations for carrying out one or more processing operations subsequent to tanning, such as for example fleshing , breaking, shaving, dyeing, greasing, desiccation (or drying), possibly staking and/or nailing, refining, stretching, pressing and/or measuring.
  • tanning such as for example fleshing , breaking, shaving, dyeing, greasing, desiccation (or drying), possibly staking and/or nailing, refining, stretching, pressing and/or measuring.
  • the system I may have an inlet IN for the leather P to be processed and an outlet OUT for the processed leather P.
  • the leather P may be moved between consecutive stations by means of appropriate advancement means.
  • the advancement means may include one or more conveyors in series and, consecutive thereto, means for unloading and/or loading the leather, for example one or more rollers arranged between a pair of stations.
  • the conveyors may for example be wire or slat conveyors or any other appropriate technology, known in the industry.
  • the advancement means may include all means which allow to move and advance the leather P between the inlet of a first station and the inlet of a second and subsequent station.
  • the advancement means may be defined by one or more conveyors in series and the consecutive rollers which allow the unloading and the subsequent loading of the leather towards the inlet of the subsequent station.
  • the advancement means may be defined by a single conveyor movable between consecutive stations.
  • the system I may include a pre-treatment station PT of the leather P having an inlet IPT and an outlet UPT.
  • the inlet IPT may correspond with the inlet IN of the system I .
  • the system I may include a diffuse coating station SV with an inlet ISV consecutive to the outlet UPT and an outlet USV.
  • the diffuse coating station SV may include a plurality of nozzles rotating around an axis Z perpendicular to the plane defined by the conveyors and cyclically passing through the surface of the leather P.
  • system I may include a station PA for curing the paint consecutive to the diffuse coating station SV and other potential processing stations without departing from the scope of protection of the attached claims.
  • the pre-treatment station PT may include a conveyor 21 of the type described above, which may extend between the inlet IPT and the outlet UPT of the station PT.
  • the conveyor 21 may define an axis Y which may coincide with the advancement direction thereof.
  • the conveyor 21 may have a width Ia21 along a direction perpendicular to the axis Y , for example measuring 70 - 380 cm.
  • inlet UPT and the outlet ISV there may be present special rollers to allow the unloading of the pre-treated leather P and the loading thereof towards the coating station SV.
  • the conveyor 21 and the rollers may define means 20 for advancing the leather P.
  • advancement means 20 may be defined solely by the conveyor 21 without departing from the scope of protection of the attached claims.
  • advancement means 20 may advance along the axis Y so as to move the leather P along a direction defined by the latter.
  • the station PT may include plasma generation means 10.
  • the conveyor 21 may be arranged above the conveyor 21 so as to at least partially face the advancement means 20, for example should the latter also include possible subsequent loading/unloading means.
  • the conveyor 21 may include a progressive planar advancement portion 210 of the leather P and the plasma generation means 10 may be positioned above the latter.
  • the progressive planar advancement portion 210 may be that conveyor portion 21 which may be in contact with the leather P so as to support it and allow the advancement thereof.
  • the plasma generation means 10 may include one or more torches 12 which generate a laminar plasma discharge along an axis X incident with respect to the axis Y .
  • the axes X and Y may be perpendicular to each other.
  • Such plasma laminar discharge may therefore act on at least one portion of the leather P.
  • the one or more torches 12 may be integrally joined with the support structure of the system I so as to remain fixed in particular during the pre-treatment of the leather P.
  • the one or more torches 12 may be movable along the axis Y without departing from the scope of protection of the attached claims.
  • the plasma generation means 10 may include a torch 12 with a pair of electrodes 11 facing each other through which there will flow the gas selected for generating plasma, in a per se known manner.
  • the electrodes 11 may both face the conveyor 21, even more specifically, the progressive planar advancement portion 210, on the same side.
  • both the electrodes 11 may be positioned above the conveyor 21, as well as the progressive planar advancement portion 210.
  • the electrodes 11 may be metallic and flat and they may each have a length Iu11 measured along the axis X measuring 60 - 100 cm, preferably 70 - 90 cm.
  • the length Iu11 may be equal to or greater than the width Ia21 so that the plasma discharge extends over the entire width of the conveyor 21.
  • the length Iu11 may be greater than the width Ia21, while should the axes Y and X be perpendicular to each other, the length Iu11 may be equal to the width Ia21.
  • the distance between the outlet of the torch 12 and the conveyor 21 may have a size d for example measuring 1-20 mm, more preferably 5-15 mm, so as to allow to obtain a matching length between the laminar plasma discharge and the length Iu11, in a per se known manner.
  • the plasma generation means 10 may include a plurality of torches 12, each with a pair of electrodes 11 facing each other, positioned consecutively in series along the axis X.
  • both the electrodes 11 of each torch 12 may be facing the conveyor 21, as well as the progressive planar advancement portion 210, on the same side.
  • both the electrodes 11 of each torch 12 may be positioned above the conveyor 21, as well as above the progressive planar advancement portion 210.
  • the electrodes 11 may be metallic and flat and they may each have a length Iu11 measured along the axis X measuring 60 - 100 cm, preferably 70 - 90 cm.
  • the succession of electrodes 11 of the plurality of torches 12 may have an overall length IuS11 along the axis X with size equal to or greater than the width Ia21, so that the plasma discharge extends over the entire width of the conveyor 21 to act on the entire surface of the leather P.
  • the length IuS11 may be greater than the width Ia21, while should the axes Y and X be perpendicular to each other, the length IuS11 may be equal to the width Ia21.
  • the conveyor 21 may have a width Ia21 equal to 380 cm and the plasma generation means 10 may include a series of several torches 12 each with a pair of electrodes 11 having length Iu11 such that the overall length IuS11 is equal to 380 cm.
  • the laminar plasma discharge may have a length corresponding to the length IuS11.
  • the distance between the outlet of the torches 12 and the conveyor 21 may measure d for example 1-20 mm, more preferably 5-15 mm, so as to allow a matching length between the laminar plasma discharge and the length IuS11, in a per se known manner.
  • the plasma generation means 10 may include a succession of torches 12 or a series of torches 12 positioned parallel along the axis Y .
  • the pre-treatment station PT may include an apparatus 1 which comprises - in a single structure - the plasma generation means 10 and the advancement means 20, as particularly shown in FIGS. 3 , 4 and 5 .
  • the plasma may be generated by applying - to the electrodes 11 - a power density amounting to about 30 - 250 W/cm, more preferably amounting to 100 - 200 W/cm.
  • the advancement means 20, specifically the conveyor 21, may have a speed of 1-12 m/min.
  • such power density and advancement speed values may allow to act on the leather P so as to create a temporary permeability on the portion thereof treated with the plasma to optimise the subsequent coating in the station SV.
  • the plasma pre-treatment will allow to increase the penetration and the absorption of the paint, with an ensuing reduced amount of paint required and lesser stationing in the coating station so as to obtain a uniform spreading on the entire surface of the leather P.
  • the selected gas may be compressed air so as to reduce costs
  • plasma may be generated starting from any other gas without departing from the scope of protection of the attached claims.
  • the contact angle measured on the pre-treated and coated leather P at the outlet USV may be 35° - 75°, more preferably 40° - 65° according to the UNI EN 828:2013 standard and any updates of such regulation subsequent to the date of filing of the present document.
  • the coating station SV may include advancement means 30 which include a conveyor 31.
  • the advancement means 20 and 30 may be consecutive with respect to each other so as to allow a continuous advancement of the leather P, as well as a continuous processing of the latter.
  • the conveyor 21 and the conveyor 31 may define a single conveyor 2131, should there not be interposed means for loading and/or unloading the leather in particular between the pre-treatment station PT and the coating station SV.
  • the latter may be loaded at the inlet IN of the system I , that is - in this case - at the inlet IPT of the pre-treatment station PT.
  • the leather P may also be moved between the inlet IPT and the outlet OUT passing through the pre-treatment station PT and the coating station SV so as to allow the plasma treatment and the subsequent coating.
  • coated leather P may pass through the curing station PA for fixing the paint and through possible subsequent additional processing stations.
  • a pre-treatment station PT as described above and which can be used in any system I as described above, therefore comprising a diffuse coating station SV consecutive to the pre-treatment station PT.
  • a such pre-treatment station PT may allow to create a temporary permeability to the leather to be coated so as to reduce the amount of paint required, as well as the overall processing thereof.
  • the present invention may include various parts and/or similar or identical elements. Unless otherwise specified, similar or identical parts and/or elements will be indicated using a single reference number, it being clear that the described technical characteristics are common to all similar or identical parts and/or elements.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Textile Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Treatment And Processing Of Natural Fur Or Leather (AREA)
EP23170019.6A 2022-04-29 2023-04-26 Station de prétraitement au plasma du cuir, et système de traitement du cuir comprenant une telle station et procédé de traitement de celui-ci Pending EP4273270A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT102022000008696A IT202200008696A1 (it) 2022-04-29 2022-04-29 Stazione per il pretrattamento al plasma di pelli, nonche’ sistema per la lavorazione di pelli che include tale stazione e metodo per la lavorazione di queste ultime

Publications (1)

Publication Number Publication Date
EP4273270A1 true EP4273270A1 (fr) 2023-11-08

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Family Applications (1)

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EP23170019.6A Pending EP4273270A1 (fr) 2022-04-29 2023-04-26 Station de prétraitement au plasma du cuir, et système de traitement du cuir comprenant une telle station et procédé de traitement de celui-ci

Country Status (2)

Country Link
EP (1) EP4273270A1 (fr)
IT (1) IT202200008696A1 (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20030039405A (ko) * 2001-11-13 2003-05-22 이규용 천연피혁개질 플라즈마장치 그리고 플라즈마로 처리한천연피혁 및 그 처리방법
EP2189544A1 (fr) * 2008-11-25 2010-05-26 Erretre S.p.A. Dispositif pour le traitement du cuir et procédé correspondant
WO2017098380A1 (fr) * 2015-12-11 2017-06-15 Ms Printing Solutions S.R.L. Installation pour imprimer, particulièrement pour imprimer numériquement, un matériau fibreux en feuille et procédé d'impression, particulièrement d'impression numérique, sur ledit matériau fibreux en feuille
US20190270320A1 (en) * 2016-11-14 2019-09-05 Agfa Nv Printing device with conveyor belt

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20030039405A (ko) * 2001-11-13 2003-05-22 이규용 천연피혁개질 플라즈마장치 그리고 플라즈마로 처리한천연피혁 및 그 처리방법
EP2189544A1 (fr) * 2008-11-25 2010-05-26 Erretre S.p.A. Dispositif pour le traitement du cuir et procédé correspondant
WO2017098380A1 (fr) * 2015-12-11 2017-06-15 Ms Printing Solutions S.R.L. Installation pour imprimer, particulièrement pour imprimer numériquement, un matériau fibreux en feuille et procédé d'impression, particulièrement d'impression numérique, sur ledit matériau fibreux en feuille
US20190270320A1 (en) * 2016-11-14 2019-09-05 Agfa Nv Printing device with conveyor belt

Also Published As

Publication number Publication date
IT202200008696A1 (it) 2023-10-29

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