EP1593748A1 - Maschine zum Zurichten von Leder - Google Patents

Maschine zum Zurichten von Leder Download PDF

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Publication number
EP1593748A1
EP1593748A1 EP05103779A EP05103779A EP1593748A1 EP 1593748 A1 EP1593748 A1 EP 1593748A1 EP 05103779 A EP05103779 A EP 05103779A EP 05103779 A EP05103779 A EP 05103779A EP 1593748 A1 EP1593748 A1 EP 1593748A1
Authority
EP
European Patent Office
Prior art keywords
machine
hides
aperture
outlet section
covering product
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Withdrawn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
EP05103779A
Other languages
English (en)
French (fr)
Inventor
Giovanni Bergozza
Maurizio Massignani
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.)
Bergi SpA
Original Assignee
Bergi SpA
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 Bergi SpA filed Critical Bergi SpA
Publication of EP1593748A1 publication Critical patent/EP1593748A1/de
Withdrawn legal-status Critical Current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
    • C14C15/00—Apparatus for chemical treatment or washing of hides, skins, or leather

Definitions

  • the present invention concerns a machine for finishing hides, used in the field of tanning.
  • the machine serves to deposit covering products on a hide, such as for example pigments, resins, oils, paraffin, glues or other.
  • the finishing machine according to the invention comprises one or more nozzles, substantially oblong in shape, whose outlet aperture has a gap with a selectively variable section, width and/or length, so as to precisely regulate the width of the spraying and the quantity of covering product to be deposited on the hide.
  • the hides In the field of industrial tanning it is known to subject the hides to at least a step of surface covering, also known as the finishing step, wherein covering products such as for example pigments, resins, oils, paraffin, glues or other are deposited on one side of the hide.
  • covering products such as for example pigments, resins, oils, paraffin, glues or other are deposited on one side of the hide.
  • This finishing step allows to improve the characteristics of the treated surface of the hide, giving it a first personalized appearance.
  • finishing step is normally performed either with a first type of machine that uses spraying pistols or nozzles, mounted on a rotary turntable, or provided with alternate motion, or with a second type of machine that uses incised rollers.
  • finishing machines of the first type for example like those disclosed in DE-C-822060, GB-A-822,669 and DE-A-2522184 use a transport device that makes the hides pass under the spraying nozzles.
  • This first type of machine allows to obtain a satisfactory result in terms of quality, but with a great waste of the covering product since, indicatively, only about 60% of the product sprayed remains on the hide, whereas the remaining 40% is deposited not on the hide, or bounces off the hide and is then sucked in.
  • this first machine is very bulky, and requires a great deal of space available.
  • Another disadvantage of the first type of machine is the need for frequent maintenance interventions, which entails an increase in the management costs.
  • a further disadvantage of the first type of machine is that, due to the rotation of the nozzles, the covering product is deposited in a circular manner, with consequent superimposition of the product as the passes follow each other. This disadvantage causes an irregular distribution of the product on the hide.
  • the machine of the second type provides that the hide is arranged on a rubber carpet, to be transported into correspondence with an incised roller, which is impregnated with the covering product, and which deposits said product on the hide through contact.
  • the second type of machine does not allow to obtain optimum results in terms of quality since, if the thickness of the hide is not perfectly homogeneous, in some areas there is a greater deposit of product, whereas in other areas there may even be no product deposited at all. If the hides are very soft, there is then the considerable difficulty of introducing them into this machine because, in order to function, the roller has to rotate in the direction opposite the direction in which the hide advances, causing the hide to be rejected and causing it to curl or roll.
  • Purpose of the present invention is to achieve a machine for finishing hides which allows to deposit on them a covering product in an optimum manner, that is, without great waste of product, and guaranteeing a uniform deposit over the whole surface of the hide.
  • Another purpose of the present invention is to achieve a machine for finishing hides that is of limited bulk, and that can deposit said covering product substantially on all types of hides, even very soft ones.
  • a machine for finishing hides comprises at least a finishing chamber inside which the hides are made to pass, in a lying position, and at least a depositing device arranged inside the finishing chamber.
  • the depositing device is in a fixed position with respect to said finishing chamber and is able to deposit a desired quantity of a covering product on the hides.
  • the depositing device is arranged above the hides.
  • said depositing device has a substantially oblong shape and comprises longitudinally a two-dimensional aperture associated with means able to define a desired outlet section for the covering product.
  • said aperture can be linear, or have a shape with one or more radiuses of curvature, also with opposed focuses.
  • the depositing device includes deformation means able to modify in a desired manner the width of the outlet section.
  • closing means are included which selectively condition the length of the outlet section.
  • the closing means are also suitable to divide said two-dimensional aperture into two or more outlet sections.
  • the deformation means comprise one or more first actuator elements, such as for example mechanical, pneumatic or oil-dynamic means, arranged along the length of the aperture and able to act transversely with respect to the latter, in order to selectively bring at least a lateral edge of the aperture closer to the other edge, or distance it therefrom, so as to regulate the width of the outlet section, and hence the quantity of covering product.
  • first actuator elements such as for example mechanical, pneumatic or oil-dynamic means
  • the closing means comprise at least a shutter element able to act longitudinally on the aperture, so as to define at least a desired length of the outlet section of the covering product, according to the size and shape of the hide.
  • This solution allows to correlate, on each occasion, the width of the layer of covering product to the width of the hide, and hence to further limit the waste of said product.
  • both the actuator elements, and also the shutter elements can be provided in a single form of embodiment, so as to obtain a complete regulation of the outlet section of the depositing device.
  • the actuator elements and/or the closing elements are associated with control means and are managed automatically.
  • detection means cooperating with the hide passing through serve said control means.
  • the finishing machine according to the present invention has the following advantages: it is static, that is, it has no moving members; a very limited space is sufficient to install it; it does not need particular suction plants and relative filters; it guarantees a homogeneous deposit of the covering product even with hides of a non-uniform thickness; it does not entail any superimposition of the covering product on the hide; it has no disadvantages connected to dynamic effects of the deposition; it allows to work substantially any type of hide, even soft or very soft; and it has limited management costs.
  • a machine 10 for finishing hides 11 is of the type used in the field of tanning in order to deposit on a hide 11 a covering product, such as for example a pigment, a resin, an oil, a paraffin, a glue or other.
  • the machine 10 comprises a finishing chamber 16, a depositing device 12, a feed belt 13 and a suction member 15, arranged below the finishing chamber 16 and the feed belt 13 in order to suck in the possible fumes of the covering product which are generated during the deposition step.
  • the finishing machine 10 also comprises a filter device, of a known type and not shown in the drawings, for example a dry filter, positioned below the feed belt 13 between the finishing chamber 16 and the suction member 15.
  • a filter device of a known type and not shown in the drawings, for example a dry filter
  • the finishing chamber 16 comprises a box-like structure open downwards, inside which the depositing device 12 is arranged, advantageously in a fixed position. Moreover, the finishing chamber 16 comprises an inlet aperture 19, through which the hides 11 to be treated are fed, and an outlet aperture 20 through which the treated hides 11 are discharged.
  • the feed belt 13 is formed by a network or plurality of annular wires arranged parallel and separated from each other, and wound in a known manner around two movement cylinders 24 and 28, of which at least one is motorized, and defining a transit plane "P" for the hide 11.
  • the suction member 15 comprises a suction chamber 27 communicating with the finishing chamber 16, and provided inside with two lateral suction collectors 29 and 30. The latter are able to suck in the fumes that are generated during the spraying step, and then discharge them outside the finishing chamber 16.
  • the depositing device 12 (figs. 2, 3, 4, 5 and 6) is substantially oblong in shape, is attached inside the finishing chamber 16, transverse to the direction of feed of the hides 11, and comprises a tank 18 inside.
  • the covering product is introduced under pressure inside the tank 18, by means of measuring pumps of a substantially known type and not shown in the drawings.
  • the depositing device 12 is substantially shaped like a parallelepiped, with maximum size of about 300 mm in width, 300 mm in height, and 3560 mm in length.
  • the depositing device 12 comprises longitudinally an aperture 17, two-dimensional, substantially rectilinear and communicating with the tank 18.
  • the aperture 17 also faces towards the feed belt 13, so that its vertical median axis "X" is substantially orthogonal to the transit plane "P" of the hide 11, and has a determinate outlet section.
  • the pressure at which the covering product is introduced inside the tank 18 in fact entails that the covering product is extruded through the aperture 17, thus defining, over the whole length of the device 12, a layer of covering product which is deposited on the hides 11.
  • the aperture 17 can have a substantially curvilinear development, or mixed rectilinear and curvilinear.
  • the median axis "X" of the aperture 17 can be substantially inclined with respect to the transit plane "P" of the hide 11, for example about 30° towards the right, or towards the left, with respect to the orthogonal.
  • the depositing device 12 allows to deposit on the hide 11 a covering product with a basic weight varying from about 0 to about 5000 gr/m 2 .
  • the aperture 17 is defined laterally by two edges 21 and 22, elastically deformable, at the sides of which a plurality of fluid-dynamic actuators 23 are arranged (figs. 2 and 3).
  • the fluid-dynamic actuators 23 are arranged at regular distances from each other along the length of the respective edge 21 or 22, and are able to act transversely from opposite sides against the latter, so as to selectively vary the width of the outlet section of the aperture 17, and hence the quantity of covering product.
  • the thickness of the layer of covering product can be regulated dynamically, even during the deposition steps, according to the type of hide 11 to be finished, the desired effect to be obtained, or the particular technical specifications of the covering product used.
  • sliding pegs 25 can be provided, moved linearly by an eccentric shaft 26, rotary, and each one able to act transversely against the relative edge 21 or 22, in order to selectively regulate the width of the outlet section. In this way it is possible to regulate the thickness of the layer of covering product deposited.
  • the eccentric shaft 26 is actuated by a drive member, of a known type and not shown in the drawings.
  • a determinate travel of the sliding peg 25 corresponds to every angle of rotation of the eccentric shaft 26, so as to reciprocally bring together or separate the edges 21 and 22.
  • the regulation of the width thus performed is very precise, and allows to define a determinate width of the outlet section, and hence the quantity of covering product.
  • two shutters 31 are provided longitudinally to the aperture 17, each one comprising a shutter blade 32 and a linear actuator 33.
  • the shutters 31 are thus able to act longitudinally with respect to the aperture 17, so as to selectively vary the length of the outlet section, and hence the width of the layer of covering product deposited.
  • the variation in length can also be performed dynamically during the deposition steps, so as to modify the lateral dimensions of the layer of covering product, according to the shape of the hide 11 to be worked.
  • the shutters 31 can divide the aperture 17 into two or more outlet sections.
  • the shutters 31 can vary the length of the aperture 17 taking it from a minimum of about 300 mm to a maximum of about 3400 mm.
  • the blade 32 is elastic and assembled able to slide outside the tank 18. This sliding assembly of the blade 32 is achieved by means of a pair of sliding seatings 36 made on the respective edges 21 and 22, inside which the lateral ends of the blade 32 are able to slide. The elasticity of the blade 32 allows to close the aperture 17 in sealed manner.
  • the blade 32 is assembled able to slide inside the tank 18 and has a substantially V-shaped transverse section.
  • This sliding assembly of the blade 32 is achieved by means of a pair of sliding seatings 37 made inside the tank 18, inside which the lateral ends of the blade 32 are able to slide.
  • the sealed closure effected by the blade 32 is guaranteed by the pressure towards the aperture 17 exerted by the covering product present inside the tank 18.
  • the finishing machine 10 also comprises a command and control unit 35 (fig. 1), able to manage the fluid-dynamic actuators 23, or the eccentric shafts 26, and the shutters 31, so as to coordinate automatically the variations in width and in length of the outlet section of the aperture 17.
  • a command and control unit 35 (fig. 1), able to manage the fluid-dynamic actuators 23, or the eccentric shafts 26, and the shutters 31, so as to coordinate automatically the variations in width and in length of the outlet section of the aperture 17.
  • the command and control unit 35 is served by a plurality of sensors 34 (figs. 1, 3 and 5), such as for example a TV camera, a presence sensor or others, arranged inside the finishing chamber 16 and able to detect, for example, the presence or absence of the hide 11, the shape thereof, its type, and other desired parameters.
  • sensors 34 such as for example a TV camera, a presence sensor or others, arranged inside the finishing chamber 16 and able to detect, for example, the presence or absence of the hide 11, the shape thereof, its type, and other desired parameters.
  • the covering product is therefore deposited on the hide 11 automatically, without excessive waste and uniformly over its whole surface.
  • the finishing machine 10 as described heretofore functions as follows.
  • First of all a first hide 11 to be treated is positioned on the feed belt 13, which makes it pass inside the finishing chamber 16.
  • the depositing device 12 is activated, so that the covering product is deposited on the hide 11.
  • command and control unit 35 commands the fluid-dynamic actuators 23, or the eccentric shafts 26, and the shutters 31 so as to automatically vary the outlet section of the covering product.
  • the covering product Once the covering product has been deposited on the hide 11, the latter is discharged outside the finishing chamber 16, to be sent to subsequent drying and storage steps.
  • both the fluid-dynamic actuators 23, and the sliding pegs 25 with the relative eccentric shafts 26 are provided in a single embodiment.
  • magnetic deformation means can be provided, able to vary the width of the outlet section, and hence the quantity of product deposited on the hides 11.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Treatment Of Fiber Materials (AREA)
EP05103779A 2004-05-07 2005-05-05 Maschine zum Zurichten von Leder Withdrawn EP1593748A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITUD20040090 ITUD20040090A1 (it) 2004-05-07 2004-05-07 Macchina per la rifinizione di pelli
ITUD20040090 2004-05-07

Publications (1)

Publication Number Publication Date
EP1593748A1 true EP1593748A1 (de) 2005-11-09

Family

ID=34939718

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05103779A Withdrawn EP1593748A1 (de) 2004-05-07 2005-05-05 Maschine zum Zurichten von Leder

Country Status (2)

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EP (1) EP1593748A1 (de)
IT (1) ITUD20040090A1 (de)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE822060C (de) * 1950-04-20 1951-11-22 Charvo Soc Verfahren und Vorrichtung zum selbsttaetigen Spritzen von Unterlagen, wie beispielsweise Haeuten, mit Fluessigkeiten, wie Farbloesungen, und deren Trocknung
GB822669A (en) * 1956-07-17 1959-10-28 Robert Douglas Price Methods for coating leather workpieces
US3587527A (en) * 1967-11-30 1971-06-28 Quinn & Co Inc K J Curtain coating apparatus
DE2522184A1 (de) * 1974-12-19 1976-07-01 Carpanese S P A Verfahren zur oberflaechenbehandlung von haeuten in gerbereien

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE822060C (de) * 1950-04-20 1951-11-22 Charvo Soc Verfahren und Vorrichtung zum selbsttaetigen Spritzen von Unterlagen, wie beispielsweise Haeuten, mit Fluessigkeiten, wie Farbloesungen, und deren Trocknung
GB822669A (en) * 1956-07-17 1959-10-28 Robert Douglas Price Methods for coating leather workpieces
US3587527A (en) * 1967-11-30 1971-06-28 Quinn & Co Inc K J Curtain coating apparatus
DE2522184A1 (de) * 1974-12-19 1976-07-01 Carpanese S P A Verfahren zur oberflaechenbehandlung von haeuten in gerbereien

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Publication number Publication date
ITUD20040090A1 (it) 2004-08-07

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