EP3601622B1 - Tambour amélioré pour le traitement de cuirs par foulage - Google Patents

Tambour amélioré pour le traitement de cuirs par foulage Download PDF

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Publication number
EP3601622B1
EP3601622B1 EP17823216.1A EP17823216A EP3601622B1 EP 3601622 B1 EP3601622 B1 EP 3601622B1 EP 17823216 A EP17823216 A EP 17823216A EP 3601622 B1 EP3601622 B1 EP 3601622B1
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EP
European Patent Office
Prior art keywords
hollow body
leathers
drum
air
outer casing
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EP17823216.1A
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German (de)
English (en)
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EP3601622A1 (fr
Inventor
Antonio Galiotto
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Erretre SpA
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Erretre SpA
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    • 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
    • C14B1/40—Softening or making skins or leather supple, e.g. by staking, boarding, or crippling machines, by dry mills
    • 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
    • C14B3/00—Milling leather

Definitions

  • the present invention generically concerns a leather processing machine such as an improved drum for the milling treatment of leathers in the tanning industry.
  • the material is, indeed, subjected to mechanical action due to its rolling inside the cylindrical (often punched) body which constitutes the main part of the machine (or drum) and which works by rotating around a generally horizontal transverse axis of the type described for instance in US1,623,943 A and EP0960948 A1 .
  • the product is cooled by means of circulation of cold air.
  • the milling cycle to which the leathers are subjected inside the cylindrical body of a tannery drum is made according to a determined "recipe" which is essentially composed of pre-established temperature and humidity conditions, cylindrical body rotation speed imparted by appropriate motorization means operatively connected with it, type and quantity of leathers treated inside the drum and time duration of the milling cycle.
  • Such a “recipe” allows to get, in a general and hypothetical way, the desired and expected level of softness for the dry leathers processed in a milling cycle.
  • a drum is a processing equipment which, by rotating, softens the leathers using a centrifugal force: the leathers are softened inside the rotating hollow body (drum) where they are contained by means of rectangular or trapezoidal deflectors (or blades) uniformly distributed on the inner wall of the hollow body itself.
  • a tannery milling drum includes two types of structure, a first one of which provides that the rotating hollow body which contains the leathers is circular, while a second one provides that the aforesaid rotating hollow body is octagonal.
  • a tannery drum having the particular constructive conception described in the patent publication CN203247270 (U ) have tried to remedy to some extent to these drawbacks providing, in a nutshell, for the insertion of a heating mechanism between the movable hollow body of the drum, placed in rotation by motorization means about the linear axis when the leathers must be treated in its inner volume, and an outer casing which surrounds the movable hollow body in such a way as to define an annular space in which the heating mechanism is precisely housed which operates by irradiation on the structure of the rotating hollow body and, in return, on the leathers to be milled, contributing to their treatment actuated by means of hot or cold air blown inside the hollow body itself.
  • the heating mechanism installed in the drum referred to in the prior document CN203247270 (U ) negatively teaches in the opposite direction to the need, often stringent and relevant for the final quality of the leathers, to dissipate the heat that the leathers themselves generate on the rotating cylindrical hollow body while subjected to milling.
  • a second drawback of the drum described in the prior art document CN203247270 (U ) is related to its complexity of construction and assembly, given the particular type and specific location of the heating mechanism provided by it, increased by the fact that the latter must be designed keeping in mind that it is integral with the hollow body which, during operation, rotates.
  • a last but not least drawback of the prior art closest to the invention constituted as said by the prior art document CN203247270 (U ) is linked to the need to adopt suitable and onerous constructive safety measures for managing the electrical powers deriving from the installation of a heating mechanism in an inner compartment - the annular space formed by the outer casing and the inner hollow body - of a drum where heat develops.
  • the present invention seeks to remedy them.
  • main purpose of the invention is to provide an improved drum for the milling treatment of leathers which allows to keep substantially at a given predetermined temperature, during the entire milling treatment, the inner hollow body which contains the leathers being processed.
  • primary purpose of the present invention is to implement an improved drum for the milling treatment of leathers which, contrary to what happens in the equivalent drums of known type, allows to manage, dissipating it, the heat developed by the moving leathers inside the rotating hollow body, during the milling cycle.
  • the aforesaid purposes are achieved by means of an improved drum for the milling treatment of leathers according to the attached claim 1, as hereinafter referred for the sake of brevity of exposure.
  • the improved drum for the milling treatment of leathers of the invention allows to control and keep substantially constant, during the entire milling treatment, the internal and external temperature (and therefore also the humidity) of the rotating inner hollow body which contains the leathers being processed.
  • the drum of the invention includes in particular a conditioning circuit cooperating with the movable hollow body through air which the conditioning circuit itself conveys within the annular space at a given temperature, varied by adjustment means according to the contingent needs of treatment of the leathers inside the rotating hollow body, in such a manner that the outer wall of the hollow body is kept at a predefined temperature, deemed to be adequate for each phase of the treatment of the leathers in the hollow body.
  • the structural assembly formed by the outer casing and the movable hollow body defines a kind of heat exchanger in which the aforesaid air which is conveyed into the annular space and flows around the outer wall of the hollow body stands for a first one of the heat exchange fluids and is at least:
  • the improved drum for the milling treatment of leathers of the invention by means of appropriate adjustment of its specific and peculiar conditioning circuit, allows dissipation of the heat developed by the moving leathers inside the rotating hollow body, during the milling cycle, guaranteeing an optimal quality of the finished product at the end of the treatment, or at least certainly better than that one offered by equivalent drums of known type.
  • the improved drum of the invention achieves values of production efficiency and of overall quality in leathers greater than those ones of similar drums comparable to it, thanks to the temperature and humidity control it provides.
  • the improved drum for the milling treatment of leathers which is the subject of the present invention, presents a construction concept simpler than equivalent drums of know type, resulting in particular with respect to the latter easier to be assembled, to all the advantage of its production cost which is rather competitive, the manpower and raw materials used for its construction being equal.
  • the improved drum of the invention specifically and exclusively used for the milling treatment of leathers, is schematically and illustratively shown in figure 1 where it is globally numbered with 1.
  • such an improved drum 1 includes:
  • the improved drum 1 comprises a conditioning circuit, in the whole signaled with 7, cooperating with the movable hollow body 3 through air A 1 which the conditioning circuit 7 conveys inside the annular space 6 at a given temperature, varied by adjustment means (not indicated) depending on the contingent needs of treatment of the leathers inside the hollow body 3 in rotation, in such a manner that the outer wall 3a of the hollow body 3 is kept at a predefined temperature, deemed to be adequate for each phase of treatment of the leathers in the hollow body 3, and a structural assembly, as a whole indicated with 8, formed by the outer casing 5 and the movable hollow body 3, defines a heat exchanger in which the air A 1 is conveyed in the annular space 6 and flows around the outer wall 3a of the movable inner hollow body 3 represents a first one of the heat exchange fluids and is at least:
  • a second of the heat exchange fluids of the aforesaid heat exchanger defined by the structural assembly 8 consists of air A 2 independent and distinct from the air A 1 circulating in the annular space 6 and introduced into the inner volume 4 of the hollow body 3 by an auxiliary conditioning circuit, as a whole reported with 9 cooperating with the hollow body 3.
  • the outer casing 5 is made of any of the materials selected from the group consisting of wood, plastic material (such as typically polypropylene), metallic material and/or combinations thereof (traditional materials for these applications in the tanning sector), and substantially has a function of support and formation of the annular space (or peripheral chamber) 6.
  • the outer casing 5 comprises an inner insulating coating 10, fixed to the inner surface 5a of the outer casing 5 and facing the outer wall 3a of the inner hollow body 3 in such a way as to be contained in the annular space 6.
  • the inner insulating coating 10 is arranged on the entire inner surface 5a of the casing 5, both on the lateral sides 5b, 5c and on the side wall 5d.
  • the inner insulating coating 10 has a thickness of 4 cm and is made of any of the foamed materials selected from the group consisting of polyurethane (PU), polyethylene (PE) and/or the like and is coupled with the outer casing 5 through junction means of the type known per se to the person skilled in the art, for example adhesives substances, screws, bolts and/or similar.
  • PU polyurethane
  • PE polyethylene
  • outer casing of the improved drum of the invention will be advantageously and hopefully, though not necessarily, made of metallic material if, in the annular space, the inner insulating coating is provided which, especially in such a case, will properly perform the function of preventing the dispersion of heat through the metallic structure of the outer casing.
  • the outer casing 5 is movable integrally and synchronously with the hollow body 3, rotating around the linear axis X during the treatment of the leathers: this in order to increase the efficiency of the treatment itself ensuring a greater reflux of air A 1 in the annular space 6.
  • the outer casing could constitute a fixed or movable component asynchronously with respect to the inner hollow body, at a different speed.
  • the movable inner hollow body 3 and the outer casing 5 are mutually coaxial and preferably have a cylindrical profile laterally closed by the respective lateral flanks 3b, 3c and 5b, 5c.
  • the conditioning circuit 7 is advantageously arranged outside the movable hollow body 3 and the outer casing 5 and is at least partly supported by the bearing frame 2 resulting extraneous to the rotation around the linear axis X.
  • This constructive arrangement allows the improved drum 1 of the present invention to be significantly different from the closest known art, constituted for example by the document CN203247270 (U ) in which the (pure) heating mechanism is contained into the interstitial space defined between the inner hollow body and the outer casing: indeed, the constructive solution associated with the invention allows greater safety both for the mechanical components and for the operators in factory with respect to the prior art, since the conditioning means 7 are released from the rotation of the inner hollow body 3 (and of the outer casing 5) during operation and are not affected by the high temperatures that develop in the structural assembly 8 and which, however, are advantageously managed by suitable adjustment of the operation of the conditioning means 7.
  • the installation of the conditioning circuit 7 outside not only of the inner hollow body 3 but also of the outer casing 5 allows the improved drum 1 to avoid the technical-constructive and plant engineering complications which can be found in the aforementioned closest prior art the (it should be considered the need to manage the installation and operation of transmission elements mounted in the annular space, as it happens in CN203247270 (U ), which from an the electric point of view place limitations and risks of manoeuvre).
  • the conditioning circuit 7 also presents the non-negligible advantage of being more easily subjected to inspection, maintenance, repair and/or replacement with respect to the current state of the art equivalent to it, with consequent further advantages both in terms of operator intervention and in economic terms.
  • figure 1 shows that the conditioning circuit 7 comprises in the specific case:
  • the conditioning circuit 7 defines a closed loop path in such a manner that the air A 1 introduced into the annular space 6 through an axial inlet 14 made in the outer casing 5 comes out from the annular space 6 through a axial outlet 15, clearly visible also in the attached figure 3 , made in the outer casing 5 and is recovered by the first fan 11.
  • the aforementioned adjustment means determine that the first heating means 13 are operated when the first diverting valve 12 is closed and inhibits the passage therethrough of air coming from the external environment at room temperature.
  • the adjustment means properly control the conditioning circuit 7, closing the heating means 11 and opening the exchange valve 12 to allow entry into the annular space 6 of colder air - at room temperature - able to cool the outer wall 3a of the hollow body 3.
  • the first heating means 13, such as for example at least one electrical resistance, are arranged upstream the axial inlet 14 made in the outer casing 5.
  • figure 1 illustrates that it preferably but not exclusively includes:
  • the auxiliary conditioning circuit 9 defines a closed-loop path in such a manner that the abovementioned air A 2 introduced into the hollow body 3 through an axial entry duct 19 made in the hollow body 3 comes out of the latter through an axial exit duct 20 made in the hollow body 3 and is recovered by the second fan 16.
  • the axial inlet 14 is arranged at the axial entry duct 19, while the axial outlet 15 is arranged at the axial exit duct 20, as it can be observed in figures 2 and 3 .
  • the auxiliary conditioning circuit 9 also includes filtering means, generally numbered with 21 and visible in figure 1 , interposed between the exit duct 20 and the second fan 16, suitable to restrain the powders present in the air A 2 coming from the hollow body 3 and in contact with the leathers while the latter were subjected to the milling treatment.
  • filtering means generally numbered with 21 and visible in figure 1 , interposed between the exit duct 20 and the second fan 16, suitable to restrain the powders present in the air A 2 coming from the hollow body 3 and in contact with the leathers while the latter were subjected to the milling treatment.
  • the motorization means, the conditioning circuit 7 and the adjustment means, as well as the auxiliary conditioning circuit 9, are electrically connected with a central processing and control unit (not shown) at the operator's availability in a location adjacent to the movable hollow body 3 and to the outer casing 5 associated therewith which manages its operation: in particular, the central processing and control unit manages the activation of the heating means 13 and of the exchange valve 12, according to the operating requirements in the inner volume 4 of the inner hollow body 3 necessary to obtain optimally softened leathers.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Manufacturing & Machinery (AREA)
  • Treatment And Processing Of Natural Fur Or Leather (AREA)
  • Treatment Of Fiber Materials (AREA)
  • Rolls And Other Rotary Bodies (AREA)

Claims (15)

  1. Tambour (1) pour le traitement par foulage des cuirs comprenant :
    - un cadre porteur (2) adapté pour reposer sur une surface de référence d'une usine industrielle ;
    - un corps creux mobile (3), couplé audit cadre porteur (2) et constitué d'un matériau au moins partiellement thermoconducteur, adapté pour recevoir dans son volume intérieur (4) les cuirs à traiter par foulage ;
    - des moyens de motorisation reliés fonctionnellement audit corps creux mobile (3) de manière à le mettre en rotation autour d'un axe linéaire (X) lorsque lesdits cuirs doivent être traités dans ledit volume intérieur (4) dudit corps creux (3) ;
    - une enveloppe extérieure (5) couplée audit cadre porteur (2) et entourant ledit corps creux mobile (3) avec lequel elle définit un espace annulaire (6),
    caractérisé en ce qu'il comprend un circuit de conditionnement (7) coopérant avec ledit corps creux mobile (3) par l'intermédiaire d'air (A1) que ledit circuit de conditionnement (7) transporte à l'intérieur dudit espace annulaire (6) à une température donnée, varié par des moyens de réglage en fonction des besoins contingents de traitement desdits cuirs à l'intérieur dudit corps creux (3) en rotation, de telle manière que la paroi extérieure (3a) dudit corps creux (3) soit maintenue à une température prédéfinie, jugée adéquate pour chaque phase dudit traitement desdits cuirs dans ledit corps creux (3), et un ensemble structurel (8) formé par ladite enveloppe extérieure (5) et ledit corps creux mobile (3) définit un échangeur de chaleur dans lequel ledit air (A1) qui est transporté dans ledit espace annulaire (6) et s'écoule autour de ladite paroi extérieure (3a) dudit corps creux (3) représente un premier parmi des fluides d'échange de chaleur et est au moins :
    • chaud dans la phase initiale dudit traitement desdits cuirs dans ledit corps creux (3) en rotation, afin de contribuer au chauffage desdits cuirs dans ledit volume intérieur (4) dudit corps creux (3) ;
    • froid dans la phase avancée dudit traitement desdits cuirs afin de dissiper la chaleur en excès développée par friction par lesdits cuirs se déplaçant dans ledit volume intérieur (4) dudit corps creux (3).
  2. Tambour (1) selon la revendication 1), caractérisé en ce qu'un second parmi les fluides d'échange de chaleur dudit échangeur de chaleur défini par ledit ensemble structurel (8) est constitué par de l'air (A2) indépendant dudit air (A1) circulant dans ledit espace annulaire (6) et introduit dans ledit volume intérieur (4) dudit corps creux (3) par un circuit de conditionnement auxiliaire (9) coopérant avec ledit corps creux (3).
  3. Tambour (1) selon la revendication 1) ou 2), caractérisé en ce que ladite enveloppe extérieure (5) est constituée de l'un quelconque des matériaux choisis dans le groupe constitué par le bois, une matière plastique, une matière métallique et/ou leurs combinaisons.
  4. Tambour selon l'une quelconque des revendications précédentes, caractérisé en ce que ladite enveloppe extérieure (5) comprend un revêtement isolant intérieur (10), fixé à la surface intérieure (5a) de ladite enveloppe extérieure (5) et faisant face à ladite paroi extérieure (3a) dudit corps creux (3) de manière à être contenu dans ledit espace annulaire (6).
  5. Tambour (1) selon la revendication 4), caractérisé en ce que ledit revêtement isolant intérieur (10) est constitué de l'un quelconque des matériaux en mousse choisis dans le groupe constitué par le polyuréthane (PU), le polyéthylène (PE) et/ou des matériaux similaires.
  6. Tambour (1) selon l'une quelconque des revendications précédentes, caractérisé en ce que ladite enveloppe extérieure (5) est mobile d'un seul tenant avec ledit corps creux (3), en tournant autour dudit axe linéaire (X) pendant ledit traitement desdits cuirs.
  7. Tambour (1) selon l'une quelconque des revendications précédentes, caractérisé en ce que ledit corps creux mobile (3) et ladite enveloppe extérieure (5) sont mutuellement coaxiaux et ont un profil cylindrique.
  8. Tambour (1) selon l'une quelconque des revendications précédentes, caractérisé en ce que ledit circuit de conditionnement (7) est disposé à l'extérieur dudit corps creux mobile (3) et de ladite enveloppe extérieure (5) et est au moins partiellement supporté par ledit cadre porteur (2).
  9. Tambour (1) selon l'une quelconque des revendications précédentes, caractérisé en ce que ledit circuit de conditionnement (7) comprend :
    - un premier ventilateur (11) en contact avec l'environnement externe adjacent audit corps creux (3) et adapté pour transporter ledit air (A1) dans ledit espace annulaire (6) ;
    - une première vanne de dérivation ou d'échange (12), placée en aval dudit premier ventilateur (11) en considérant la direction d'écoulement dudit air (A1) à l'entrée dans ledit espace annulaire (6) ;
    - des premiers moyens de chauffage (13) disposés entre ladite première vanne de dérivation (12) et ledit corps creux mobile (3),
    ledit circuit de conditionnement (7) définissant un trajet en boucle fermée de telle manière que ledit air (A1) introduit dans ledit espace annulaire (6) par une entrée axiale (14) réalisée dans ladite enveloppe extérieure (5) sort dudit espace annulaire (6) par une sortie axiale (15) réalisée dans ladite enveloppe extérieure (5) et est récupéré par ledit premier ventilateur (11).
  10. Tambour (1) selon la revendication 9), caractérisé en ce que lesdits premiers moyens de chauffage (13) sont actionnés lorsque ladite première vanne de dérivation (12) est fermée et empêche le passage à travers elle de l'air provenant dudit environnement externe.
  11. Tambour (1) selon la revendication 9) ou 10), caractérisé en ce que lesdits premiers moyens de chauffage (13) sont disposés en amont de ladite entrée axiale (14) réalisée dans ladite enveloppe extérieure (5).
  12. Tambour (1) selon l'une quelconque des revendications de 2) à 11), caractérisé en ce que ledit circuit de conditionnement auxiliaire (9) inclut :
    - un second ventilateur (16) en contact avec l'environnement externe adjacent audit corps creux (3) et adapté pour transporter de l'air (A2) dans ledit volume intérieur (4) dudit corps creux (3) ;
    - une seconde vanne de dérivation ou d'échange (17), placée en aval dudit second ventilateur (16) en considérant la direction d'écoulement dudit air (A2) à l'entrée dans ledit corps creux mobile (3) ;
    - des seconds moyens de chauffage (18) disposés entre ladite seconde vanne de dérivation (17) et ledit corps creux mobile (3),
    ledit circuit de conditionnement auxiliaire (9) définissant un trajet en boucle fermée de telle manière que ledit air (A2) introduit dans ledit corps creux (3) par un conduit d'entrée axial (19) réalisé dans ledit corps creux (3) sort dudit corps creux (3) par un conduit de sortie axial (20) réalisé dans ledit corps creux (3) et est récupéré par ledit second ventilateur (16).
  13. Tambour (1) selon la revendication 12) lorsqu'elle dépend de la revendication 9), 10) ou 11), caractérisé en ce que ladite entrée axiale (14) est disposée au niveau dudit conduit d'entrée axial (19) et ladite sortie axiale (15) est disposée au niveau dudit conduit de sortie axial (20).
  14. Tambour (1) selon la revendication 12) ou 13), caractérisé en ce que ledit circuit de conditionnement auxiliaire (9) inclut des moyens de filtrage (21), interposés entre ledit conduit de sortie (20) et ledit second ventilateur (16), adaptés pour retenir les poudres présentes dans ledit air (A2) provenant dudit corps creux (3) dans lequel lesdits cuirs sont soumis audit traitement par foulage.
  15. Tambour (1) selon l'une quelconque des revendications précédentes, caractérisé en ce que lesdits moyens de motorisation, ledit circuit de conditionnement (7) et lesdits moyens de réglage sont reliés électriquement à une unité centrale de traitement et de commande à la disposition de l'opérateur qui gère leur fonctionnement.
EP17823216.1A 2017-03-23 2017-12-04 Tambour amélioré pour le traitement de cuirs par foulage Active EP3601622B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT102017000031928A IT201700031928A1 (it) 2017-03-23 2017-03-23 Bottale perfezionato per il trattamento di bottalatura delle pelli
PCT/IB2017/057604 WO2018172837A1 (fr) 2017-03-23 2017-12-04 Tambour amélioré pour le traitement de cuirs par foulage

Publications (2)

Publication Number Publication Date
EP3601622A1 EP3601622A1 (fr) 2020-02-05
EP3601622B1 true EP3601622B1 (fr) 2022-06-29

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EP17823216.1A Active EP3601622B1 (fr) 2017-03-23 2017-12-04 Tambour amélioré pour le traitement de cuirs par foulage

Country Status (5)

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EP (1) EP3601622B1 (fr)
CN (1) CN110402291B (fr)
BR (1) BR112019019398B1 (fr)
IT (1) IT201700031928A1 (fr)
WO (1) WO2018172837A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT201900016685A1 (it) * 2019-09-19 2021-03-19 Erretre Spa Metodo di esecuzione di un ciclo di bottalatura di pelli
IT202000019624A1 (it) * 2020-08-07 2022-02-07 Erretre Spa Impianto industriale di bottalatura di pelli a migliorato impatto ambientale
CN113862403A (zh) * 2021-11-10 2021-12-31 无锡市新达轻工机械有限公司 冷风型控温控湿皮革摔软机系统

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1623943A (en) * 1923-05-31 1927-04-05 George S Neeley Leather-treating process and apparatus for same
ITVI980107A1 (it) * 1998-05-27 1999-11-29 Erretre Srl Bottale di follonaggio, tintura e riconcia
ITVI20050041A1 (it) * 2005-02-15 2006-08-16 Erretre Spa Bottale di follonaggio, tintura e riconcia
CN203247270U (zh) * 2013-01-30 2013-10-23 温州致富皮业有限公司 皮革摔软转鼓的外壳结构
WO2015181691A1 (fr) * 2014-05-26 2015-12-03 Cos.T.A. S.R.L. Cylindre à commande thermostatique pour traitements thermiques, procédé de fabrication dudit cylindre et système comprenant ledit cylindre

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Publication number Publication date
EP3601622A1 (fr) 2020-02-05
WO2018172837A1 (fr) 2018-09-27
BR112019019398B1 (pt) 2023-05-16
IT201700031928A1 (it) 2018-09-23
CN110402291A (zh) 2019-11-01
CN110402291B (zh) 2021-08-10
BR112019019398A2 (pt) 2020-04-14

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