EP2935631A1 - Method and apparatus for drying hides during the finishing process - Google Patents

Method and apparatus for drying hides during the finishing process

Info

Publication number
EP2935631A1
EP2935631A1 EP12829162.2A EP12829162A EP2935631A1 EP 2935631 A1 EP2935631 A1 EP 2935631A1 EP 12829162 A EP12829162 A EP 12829162A EP 2935631 A1 EP2935631 A1 EP 2935631A1
Authority
EP
European Patent Office
Prior art keywords
hides
layer
finishing
drying
liquid
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.)
Granted
Application number
EP12829162.2A
Other languages
German (de)
French (fr)
Other versions
EP2935631B1 (en
Inventor
Antonio Polato
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.)
Officine Di Cartigliano SpA
Original Assignee
Officine Di Cartigliano 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 Officine Di Cartigliano SpA filed Critical Officine Di Cartigliano SpA
Publication of EP2935631A1 publication Critical patent/EP2935631A1/en
Application granted granted Critical
Publication of EP2935631B1 publication Critical patent/EP2935631B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • C14B1/58—Drying
    • 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
    • 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
    • C14B2700/00—Mechanical treatment or processing of skins, hides or leather in general; Pelt-shearing machines; Making driving belts; Machines for splitting intestines
    • C14B2700/07—Leather tensioning or stretching frames; Stretching-machines; Setting-out boards; Pasting boards; Fastening devices; Drying of leather

Definitions

  • the present invention generally finds application in the field of tanning and nonwoven (imitation leather) fabrics, and particularly relates to a method of forming crust leather by drying, during the finishing process.
  • the invention in another aspect, relates to an apparatus for drying hides (crust) that uses the method.
  • the dried hides undergo a process typically known as finishing, whereby such defects are removed or made less visible, for better use of the hides.
  • Finishing may be a mechanical or chemical process.
  • chemical finishing which is the one of interest herein, the hides are coated with generally liquid products, which are designed to form a grain side layer that may have various thicknesses or be elastic or tough according to the type of finishing and leather.
  • the finishing products may be selected, for instance, from the group of synthetic (acrylic, butadiene, polyurethane) resins or natural binders (caseins, albumins, protein-based film-forming agents, based on modified cellulose) possibly added with pigments, dyes, opacifiers, polishing agents, various auxiliary additives. These products are mixed with 20% to 40%, preferably 25% to 30% water, based on the total mass. The aqueous solution is deposited on the grain side of the hides and forms a film that is designed to intimately bind with the fibers, to become integral with the hide.
  • the hide contacts the product-wetted roller and is supported by an opposed conveying roller. This will optimize the finishing process. A continuous, uniform and easily adjustable coating is obtained.
  • a further layer of a fixing agent is typically deposited, for stabilization and preservation of the underlying finishing layer.
  • This layer of fixing agent should also undergo drying in a hot air tunnel as described above.
  • the drying process has been typically carried out to date using an oven or a tunnel operating with infrared rays, catalytic gas and more often with hot air.
  • FIG. 1 shows a typical finishing plant R comprising two spray units R1 with two air drying tunnels T1 , T2 downstream therefrom, between the two paint and fixing agent coating stations, and upstream from a chiller C and a staker K for imparting softness to the hides again.
  • Hot air is conveyed into the tunnels T1 , T2, using high-capacity compressors and blowers, with a capacity of thousands of cubic meters/hour.
  • the drying temperatures in these apparatus generally range from 80 °C to 1 20 °C.
  • a further drawback is that after the deposition of the finishing layer, the dried hides have a hot surface and cannot be easily handled and stacked. Therefore, completely dried hides shall be typically cooled using a cooling device, such as a cold air chiller, which has high power consumption.
  • any shrinking effect of the hot drying process will cause unevenness and some skrinkage in the hides, thereby leading to a significant reduction of the useful leather area, and to a reduction of the final inherent value of the treated hides.
  • a further object of the invention is to provide a drying method that has a lower power consumption and minimizes the costs of the final product.
  • Yet another object is to devise a drying method performed during finishing that does not harden hides and maintains the hand of the treated hides.
  • drying and the whole finishing process will have very low running costs.
  • power consumption will be about 1 electric kW per liter of extracted water.
  • hides will be heated to temperatures not exceeding 30 °.
  • drying process will be substantially uniform and require very little moisture extraction, thereby avoiding the infiltration of dust and other foreign matter.
  • the invention relates to a plant for drying hides being finished, as defined in claim 7.
  • FIG. 1 is a general view of a prior art finishing plant using hot air drying tunnels
  • FIG. 2 is a perspective view of a finishing plant which incorporates drying apparatus of the invention ;
  • FIG. 3 shows a side view of a detail of FIG. 2 in an enlarged scale
  • FIG. 4 is a partially broken-away side view of the apparatus of FIG. 3;
  • FIG. 6 shows a block diagram of the drying method of the invention.
  • the drying plant of the invention is designed to be part of a plant for finishing crust hides P, generally referenced R.
  • the finishing plant R comprises, as is known in the art, a first finishing unit R1 , for depositing a first layer or film S' of a liquid finishing product on a surface of the hides P, on the grain side or the flesh side.
  • the finishing unit R1 may be of spray, roller or curtain coating type, as is known per se and not included in the scope of the present invention, for spraying or spreading the finishing solution on one face of the hides P being treated.
  • the rate of the fixing solution will range from 2 to 1 5 g/inch 2 .
  • the moving transfer surface 5 may consist of a belt conveyor or annular wires subtended by end rollers 6, 7, one of which is motorized, for automatic feeding of the hides P.
  • An electromagnetic wave irradiator irradiating waves in the RF range, generally referenced 8, is placed in the shielding tunnel 2 and is designed to irradiate the surface of the hides P to be dried.
  • the irradiator 8 essentially comprises a series of upper electrodes 9 and a series of lower electrodes 1 0 located on each side of the belt conveyor 5 to irradiate the opposite surfaces of the hides P.
  • the upper electrodes 9 and the lower electrodes 1 0 have such a size as to ensure substantially complete drying of the first finishing layer S'.
  • the irradiator 8 will be adjusted to ensure extraction of at least an amount of liquid ranging from 5 to 20 g/inch 2 .
  • a second drying apparatus 1 ' substantially identical to the first 1 is located downstream from the second finishing unit R2, and is adjusted to ensure extraction of at least an amount of liquid ranging from 3 to 30 g/inch 2 .
  • the finishing liquids are known to be aqueous solutions of organic and pigmenting products, representing about 20% to 40%, preferably about 25% to 30% based on the total weight of the solution.
  • the organic component of the finishing layer deposited on the hide is almost instantaneously dried and cross-linked, and forms some sort of impermeable film on the grain side. Therefore, the interfibrillar water molecules cannot come out of the grain side, due to the presence of the impermeable film, and are forced to penetrate the leather fibers in the downward direction, to come out of the flesh side, where not impermeable barrier exists. Such penetration actually provides a one-way pumping effect toward the side opposite to the finishing side.
  • Such one-way pumping of water molecules was surprisingly found to open out the fibers and to impart superior softness to the hide, as well as a hand that avoids crutch staking.
  • the overall power consumption will be about 1 electric kW per liter of extracted water.
  • the method comprises at least one step a) of substantially evenly applying a first layer S' of a finishing product solution on one surface of the hides.
  • This step is followed by at least one second step c) of evenly distributing a second layer S" of a liquid fixing agent on the first layer S', for stabilizing and protecting the first layer S'.
  • the drying method comprises, after each of the steps a) of applying the first layer S' and b) of distributing the second layer S", a first step b) and a second step d) of irradiating the wet portion of the hides P with an alternating electromagnetic field whose frequency is within the RF range, for substantially complete drying of said first and said second layers.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Organic Chemistry (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)
  • Drying Of Solid Materials (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
  • Coloring (AREA)

Abstract

A method of drying hides (P) during the finishing process. The finishing process comprises at least one first step a) of depositing a first layer (S') of liquid coating or finishing mixture on the hides (P), possibly followed by a second step c) of depositing a second layer of a fixing agent (S") on the first layer (S'). Drying comprises a first step b) of irradiating the first finishing layer (S') with an alternating electromagnetic field whose frequency is within the RF range, for substantially complete drying of the first layer (S'), followed by a second step d) of irradiating the second layer of fixing agent (S") deposited in said second deposition step c). An apparatus for drying hides (P) during the finishing process, which is designed to be located in a leather finishing plant (R) comprises a shielding tunnel (2), having therein a moving transfer surface (5) for feeding the hides in a predetermined direction (V) and an electromagnetic wave irradiator (8) for irradiating waves in the RF range, which is directed toward the surface of the hides (P) coated with the layers (S', S").

Description

METHOD AND APPARATUS FOR DRYING HIDES DURING THE FINISHING PROCESS
DESCRI PTION
Field of the invention
[001 ] The present invention generally finds application in the field of tanning and nonwoven (imitation leather) fabrics, and particularly relates to a method of forming crust leather by drying, during the finishing process.
[002] In another aspect, the invention relates to an apparatus for drying hides (crust) that uses the method.
Background art
[003] After the various tanning, re-tanning and dyeing treatments, hides are known to often exhibit surface defects that were naturally formed during the life of the animals (scratches due to goring, contact with barbed wire or thorns) or caused by poor leather preservation after flaying.
[004] In these cases, the dried hides (crust) undergo a process typically known as finishing, whereby such defects are removed or made less visible, for better use of the hides.
[005] Finishing may be a mechanical or chemical process. In chemical finishing, which is the one of interest herein, the hides are coated with generally liquid products, which are designed to form a grain side layer that may have various thicknesses or be elastic or tough according to the type of finishing and leather.
[006] The finishing products may be selected, for instance, from the group of synthetic (acrylic, butadiene, polyurethane) resins or natural binders (caseins, albumins, protein-based film-forming agents, based on modified cellulose) possibly added with pigments, dyes, opacifiers, polishing agents, various auxiliary additives. These products are mixed with 20% to 40%, preferably 25% to 30% water, based on the total mass. The aqueous solution is deposited on the grain side of the hides and forms a film that is designed to intimately bind with the fibers, to become integral with the hide.
[007] The finishing liquid may be applied essentially using three methods: spray, roller or curtain coating. [008] The spray coating method consists in applying finishing chemicals to the hide surface, in automatic spray lines where hides are laid on appropriate belt conveyors, and their surface is sprayed in tunnels or cabins by rotating or reciprocating guns (curtain coating machine).
[009] The roller coating method is carried out in a roller coating unit, with rollers designed to transfer the substances to the hide surface. Particularly, the unit has a metal roller with a given pattern engraved thereon, which is dipped in the finishing liquid bath, and a blade, which is used to limit the amount of liquid being transferred.
[0010] The hide contacts the product-wetted roller and is supported by an opposed conveying roller. This will optimize the finishing process. A continuous, uniform and easily adjustable coating is obtained.
[0011 ] In both cases, a further layer of a fixing agent is typically deposited, for stabilization and preservation of the underlying finishing layer. This layer of fixing agent should also undergo drying in a hot air tunnel as described above.
[0012] The drying process has been typically carried out to date using an oven or a tunnel operating with infrared rays, catalytic gas and more often with hot air.
[0013] FIG. 1 shows a typical finishing plant R comprising two spray units R1 with two air drying tunnels T1 , T2 downstream therefrom, between the two paint and fixing agent coating stations, and upstream from a chiller C and a staker K for imparting softness to the hides again. Hot air is conveyed into the tunnels T1 , T2, using high-capacity compressors and blowers, with a capacity of thousands of cubic meters/hour.
[0014] While this type of drying apparatus affords some effectiveness, it still has the drawback of carrying dust and impurities, which are deposited on the hides and integrated in their surface, thereby reducing the quality of the finished hides.
[0015] The drying temperatures in these apparatus generally range from 80 °C to 1 20 °C.
[0016] One drawback of these prior art methods and plants consists in that the production of high hot air flow rates requires considerable energy costs.
[0017] A further drawback is that after the deposition of the finishing layer, the dried hides have a hot surface and cannot be easily handled and stacked. Therefore, completely dried hides shall be typically cooled using a cooling device, such as a cold air chiller, which has high power consumption.
[0018] Another drawback is that high temperature drying processes are not uniform and tend to alter the "hand" of leather, i.e. make it more rigid and less soft than they were in the unfinished state.
[0019] Finally, any shrinking effect of the hot drying process will cause unevenness and some skrinkage in the hides, thereby leading to a significant reduction of the useful leather area, and to a reduction of the final inherent value of the treated hides.
Disclosure of the invention
[0020] The object of the present invention is to obviate or at least alleviate the above drawbacks, by providing a method and an apparatus for drying crust hides during finishing, that is highly efficient and relatively cost- effective.
[0021 ] Another object of the invention is to provide a drying method that uses a lower temperature than prior art drying methods.
[0022] A further object of the invention is to provide a drying method that has a lower power consumption and minimizes the costs of the final product.
[0023] Another object of the invention is to provide a drying method performed after finishing that maintains the useful area of the finished hides substantially unaltered.
[0024] Yet another object is to devise a drying method performed during finishing that does not harden hides and maintains the hand of the treated hides.
[0025] These and other objects, as better explained hereafter, are fulfilled by a method of drying hides being treated during the finishing process, as defined in claim 1 .
With this combination of features, drying and the whole finishing process will have very low running costs. Particularly, power consumption will be about 1 electric kW per liter of extracted water.
[0026] Advantageously, with the drying method of the invention, hides will be heated to temperatures not exceeding 30 °.
[0027] Furthermore, the drying process will be substantially uniform and require very little moisture extraction, thereby avoiding the infiltration of dust and other foreign matter.
[0028] Also, no cooling will be required downstream from drying, which will avoid the need for expensive cooling units, having high power consumption.
[0029] Finally, the hides will keep their hand unaltered with no significant loss of useful area.
[0030] In a further aspect, the invention relates to a plant for drying hides being finished, as defined in claim 7.
[0031 ] Advantageous embodiments of the invention are defined in accordance with the dependent claims.
Brief description of the drawings
[0032] Further features and advantages of the invention will become more apparent from the detailed description of a few preferred, non-exclusive embodiments of a method and plant of the invention, which are described as non-limiting examples with the help with the accompanying drawings in which :
[0033] FIG. 1 is a general view of a prior art finishing plant using hot air drying tunnels;
[0034] FIG. 2 is a perspective view of a finishing plant which incorporates drying apparatus of the invention ;
[0035] Fig. 3 shows a side view of a detail of FIG. 2 in an enlarged scale;
[0036] FIG. 4 is a partially broken-away side view of the apparatus of FIG. 3;
[0037] FIG. 5 is a front view of the apparatus of FIG. 3;
[0038] FIG. 6 shows a block diagram of the drying method of the invention.
Detailed description of a preferred embodiment
[0039] Referring to the above figures, the drying plant of the invention, generally designated by numeral 1 , is designed to be part of a plant for finishing crust hides P, generally referenced R.
[0040] The finishing plant R comprises, as is known in the art, a first finishing unit R1 , for depositing a first layer or film S' of a liquid finishing product on a surface of the hides P, on the grain side or the flesh side.
[0041 ] Namely, the first finishing unit R1 has an inlet section I for the hides P to be treated and an outlet section O for the treated hides.
[0042] A moving transfer surface, not shown, is interposed between the inlet I and the outlet O, for automatically and continuously feeding the hides P in a predetermined direction V.
[0043] The finishing unit R1 may be of spray, roller or curtain coating type, as is known per se and not included in the scope of the present invention, for spraying or spreading the finishing solution on one face of the hides P being treated.
[0044] Thus, the rate of the finishing solution will range from 3 to 30 g/inch2.
[0045] In such plant, a second finishing unit R2 is provided, substantially identical to the first, for uniform application of a second layer S" of a liquid product on the first layer S', for stabilizing and protecting said first layer.
Here, the rate of the fixing solution will range from 2 to 1 5 g/inch2.
[0046] According to the invention, a first drying apparatus 1 of the invention is placed downstream from the first finishing unit R1 , and has a frame that supports a shielding tunnel 2 having an inlet 3 and an outlet 4.
[0047] A moving transfer surface 5 slides in the tunnel 2, for feeding hides lying thereon in the direction V.
[0048] Conveniently, the moving transfer surface 5 may consist of a belt conveyor or annular wires subtended by end rollers 6, 7, one of which is motorized, for automatic feeding of the hides P.
[0049] An electromagnetic wave irradiator, irradiating waves in the RF range, generally referenced 8, is placed in the shielding tunnel 2 and is designed to irradiate the surface of the hides P to be dried.
[0050] The irradiator 8 essentially comprises a series of upper electrodes 9 and a series of lower electrodes 1 0 located on each side of the belt conveyor 5 to irradiate the opposite surfaces of the hides P.
[0051 ] Suitably, the upper electrodes 9 and the lower electrodes 1 0 have such a size as to ensure substantially complete drying of the first finishing layer S'.
[0052] The electrodes 9, 1 0 are connected to a high frequency voltage and current generator 1 1 , as is known per se and within the reach of the skilled person, which is controlled by an inverter 1 2 or by mechanical electrode adjustment 1 2 located in a cabinet 1 3, which will allow control of the supply voltage and current to the electrodes of the irradiator 8.
[0053] Particularly, the irradiator 8 will be adjusted to ensure extraction of at least an amount of liquid ranging from 5 to 20 g/inch2.
[0054] Conveniently, a second drying apparatus 1 ', substantially identical to the first 1 is located downstream from the second finishing unit R2, and is adjusted to ensure extraction of at least an amount of liquid ranging from 3 to 30 g/inch2.
[0055] With this arrangement, the drying costs will be dramatically reduced as compared with those of currently available I R ray or hot air plants.
[0056] Since electromagnetic waves are irradiated at ambient temperature, with no additional heat application, the final temperature of hides does not exceed 40 °C, and is preferably lower than 30 °C.
[0057] The low temperature of dried hides will allow immediate handling and stacking thereof without allowing them to cool. Also, this will avoid the use of cold air chillers, which have high costs and maintenance requirements, downstream from the drying units.
[0058] Furthermore, the finishing liquids are known to be aqueous solutions of organic and pigmenting products, representing about 20% to 40%, preferably about 25% to 30% based on the total weight of the solution. The organic component of the finishing layer deposited on the hide is almost instantaneously dried and cross-linked, and forms some sort of impermeable film on the grain side. Therefore, the interfibrillar water molecules cannot come out of the grain side, due to the presence of the impermeable film, and are forced to penetrate the leather fibers in the downward direction, to come out of the flesh side, where not impermeable barrier exists. Such penetration actually provides a one-way pumping effect toward the side opposite to the finishing side. Such one-way pumping of water molecules was surprisingly found to open out the fibers and to impart superior softness to the hide, as well as a hand that avoids crutch staking.
[0059] Since no hot air is used, power consumption will be greatly reduced, due to the lack of blowers and heating steam. Furthermore, hides will not be contaminated with dust or foreign matters carried in the tunnel by the forced air supply.
[0060] The overall power consumption will be about 1 electric kW per liter of extracted water.
[0061 ] Also, the lack of strong thermal stresses at relatively high temperatures, up to 1 20 °C, will prevent hides from drying out or reduce their softness or hand feel.
[0062] Finally, but not less importantly, the lack of abrupt temperature changes as a whole and through the thickness of hides will prevent reductions of useful area of leather, which would involve a reduction of the inherent value and sale price of hides.
[0063] As a result, the drying apparatus 1 of the invention may be used with any existing finishing plant, using the belt conveyors 6 of the finishing plant as a moving transfer surface, and placing the pairs of electrodes of the first 12 and second 1 3 drying units on each side of the common belt conveyor 6.
[0064] FIG. 6 shows a block diagram of the drying method of the invention, when used with a per-se known finishing process.
[0065] The method comprises at least one step a) of substantially evenly applying a first layer S' of a finishing product solution on one surface of the hides.
[0066] This step is followed by at least one second step c) of evenly distributing a second layer S" of a liquid fixing agent on the first layer S', for stabilizing and protecting the first layer S'.
[0067] The drying method comprises, after each of the steps a) of applying the first layer S' and b) of distributing the second layer S", a first step b) and a second step d) of irradiating the wet portion of the hides P with an alternating electromagnetic field whose frequency is within the RF range, for substantially complete drying of said first and said second layers.
[0068] The method and plant of the invention are susceptible to a number of changes or variants, within the inventive concept disclosed in the appended claims. All the details thereof may be replaced by other technically equivalent parts, and the materials may vary depending on different needs, without departure from the scope of the invention.
[0069] While the method and plant have been described with particular reference to the accompanying figures, the numerals referred to in the disclosure and claims are only used for the sake of a better intelligibility of the invention and shall not be intended to limit the claimed scope in any manner.

Claims

1 . A method of drying hides (P) during the finishing process, wherein the finishing process comprises at least one first step of a) applying a first layer (S') of a finishing liquid composition on a one surface of the hides, optionally followed by a second step c) of applying on said first layer (S') a second layer (S") of a fixing solution for protecting and stabilization of said first layer (S'), wherein the drying method comprises a first step b) of irradiating of said first finishing layer (S') with an electro-magnetic oscillating field with frequency comprised in the range of the radio-frequency (RF) to provide a substantially complete drying of said first layer (S').
2. Method as claimed in claim 1 , wherein a second step d) is provided for drying said second fixation layer (S") layered with said second application step c).
3. Method as claimed in claim 1 , wherein said first draying step b) and said second draying step d) are carried out on the hides (P) at ambient temperature without hot air flow in such a manner that the treated hides are maintained at temperature substantially lower than 30 °C.
4. Method as claimed in claim 1 , wherein said first irradiating step b) is carried out to polymerize almost instantaneously the organic component of said first layer (S') in such a manner to force the interfibrillar water molecules to come out of the leather side opposite to that of the application.
5. Method as claimed in claim 1 , wherein the specific energy of said oscillating electro-magnetic field in the RF range for each liter of vaporized liquid is between 0,5 and 2 KW/I.
6. An apparatus (1 ) for carrying out the drying of hides (P) according to one or more of the preceding claims, wherein the apparatus is designed to be located in a plant (R) for finishing hides, the apparatus comprising a shielding tunnel (2) internally of which are located a movable transfer surface (5) for advancement of the hides along a predetermined direction (V), a radiating antenna (8) for irradiating an electro-magnetic field in the RF range towards the hides (P) undergoing a finishing process.
7. Apparatus as claimed in claim 6, wherein said radiating antenna (8) for emitting electro-magnetic waves in the RF range comprises a series of upper electrodes (9) and a series of lower counter-electrodes (1 0) supplied by a generator of high frequency oscillating tension connected to a triode automatically controlled by an inverter (1 2) or manually adjusted.
8. Apparatus as claimed in claim 7, wherein said inverter (1 2) is adjusted to supply said radiating antenna (8) to dry a quantity of liquid at least comprised between 5 and 20 g/inch2.
9. Apparatus as claimed in claim 7, wherein said inverter (1 2) is adjusted to supply said radiating antenna (8) to dry a quantity of liquid at least comprised between 3 and 30 g/inch2.
1 0. A plant (R) for finishing dried crusted hides (P), comprising a first finishing unit (R1 ) for evenly applying on at least one surface of the hides (P) a first layer (S') a finishing liquid solution, a second finishing unit (R2) for evenly applying on said first layer (S') a second layer (S") of a liquid stabilization and protection liquid product, a first drying apparatus (1 ) downstream of said first finishing unit (R1 ) having a transfer mobile surface (5) for advancement of the hides (P) and an emitting antenna (8) for radiating electro-magnetic waves in the RF range directed towards the hide surface (P), wherein said first apparatus (1 ) is designed to dry in a substantially complete manner said first layer (S'), a second apparatus (1 ') substantially identical to the first one (1 ) and designed to dry in a substantially complete manner respectively said second layer (S").
1 1 . Plant as claimed in claim 10, wherein said first apparatus (1 ) and said second apparatus(1 ') are functionally independent form each other and are connected to respective generators of electro-magnetic oscillating fields with frequency proximate to 24 MHz and with specific power consumption comprised between 0,5 and 2 KW/I of dried liquid.
EP12829162.2A 2012-12-19 2012-12-28 Method and apparatus for drying hides during the finishing process Active EP2935631B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT000338A ITVI20120338A1 (en) 2012-12-19 2012-12-19 METHOD AND EQUIPMENT FOR SKIN DRYING DURING THE FINISHING PROCESS
PCT/IB2012/057798 WO2014096910A1 (en) 2012-12-19 2012-12-28 Method and apparatus for drying hides during the finishing process

Publications (2)

Publication Number Publication Date
EP2935631A1 true EP2935631A1 (en) 2015-10-28
EP2935631B1 EP2935631B1 (en) 2016-11-16

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Country Status (9)

Country Link
EP (1) EP2935631B1 (en)
KR (1) KR101940852B1 (en)
CN (1) CN105008552B (en)
BR (1) BR112015014689B1 (en)
ES (1) ES2613762T3 (en)
IT (1) ITVI20120338A1 (en)
MX (1) MX364843B (en)
PT (1) PT2935631T (en)
WO (1) WO2014096910A1 (en)

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RU2655770C1 (en) * 2017-04-24 2018-05-29 Государственное бюджетное образовательное учреждение высшего образования Нижегородский государственный инженерно-экономический университет (НГИЭУ) Super high frequency installation with portable cylindrical resonators for drying down and fur material continuously
RU2651593C1 (en) * 2017-04-24 2018-04-23 Государственное бюджетное образовательное учреждение высшего образования Нижегородский государственный инженерно-экономический университет (НГИЭУ) Aerodynamic dryer of down and fur raw material with the influence of electromagnetic field of super high frequency
RU2651594C1 (en) * 2017-04-25 2018-04-23 Государственное бюджетное образовательное учреждение высшего образования Нижегородский государственный инженерно-экономический университет (НГИЭУ) Microwave drier of down and fur raw materials of the rotor type
RU2655748C1 (en) * 2017-07-03 2018-05-29 Государственное бюджетное образовательное учреждение высшего образования Нижегородский государственный инженерно-экономический университет (НГИЭУ) Microwave installation providing fur separation from the skin of rabbit hides
IT201900025135A1 (en) * 2019-12-20 2021-06-20 Ge Ma Ta Spa DRYING TUNNEL OF THE CHEMICAL FILM DEPOSITED ON THE SKIN SURFACE IN THE PHASE OF FINISHING THE SKIN ITSELF AND A LEATHER FINISHING LINE THAT INCLUDES SAID DRYING TUNNEL
IT202000010873A1 (en) * 2020-05-13 2021-11-13 Todesco S R L METHOD, PLANT AND STATION FOR THE PROCESSING OF ANIMAL SKINS
CN116287483B (en) * 2023-03-23 2024-02-13 重庆能源职业学院 Drying equipment with reciprocating motion structure

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BR112015014689B1 (en) 2021-03-30
CN105008552A (en) 2015-10-28
MX364843B (en) 2019-05-08
ES2613762T3 (en) 2017-05-25
MX2015007924A (en) 2016-02-05
KR20150096512A (en) 2015-08-24
CN105008552B (en) 2017-08-22
EP2935631B1 (en) 2016-11-16
WO2014096910A1 (en) 2014-06-26
ITVI20120338A1 (en) 2014-06-20
KR101940852B1 (en) 2019-01-21
BR112015014689A2 (en) 2017-07-11

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