EP3749788B1 - Installation industrielle de foulage de cuirs - Google Patents

Installation industrielle de foulage de cuirs Download PDF

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Publication number
EP3749788B1
EP3749788B1 EP19707472.7A EP19707472A EP3749788B1 EP 3749788 B1 EP3749788 B1 EP 3749788B1 EP 19707472 A EP19707472 A EP 19707472A EP 3749788 B1 EP3749788 B1 EP 3749788B1
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EP
European Patent Office
Prior art keywords
hollow body
conveyor belt
leathers
plant
previous
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EP19707472.7A
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German (de)
English (en)
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EP3749788A1 (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
    • C14B1/44—Mechanical treatment of leather surfaces
    • 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
    • C14B17/00—Details of apparatus or machines for manufacturing or treating skins, hides, leather, or furs
    • 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
    • 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 an industrial plant for milling tannery leathers, or similar flexible and special laminar surfaces (imitation leather, ennobled leather and so on).
  • milling refers to the treatment of leathers in a watertight machine, known as “drum”, which is performed both to prepare the leather itself for tanning, dyeing o greasing and to subject them to the actual tanning, dyeing or greasing processes.
  • the milling is a mechanical process which is carried out on any type of special fabric - in general, animal leathers - in order to give the product the appearance of aging or wrinkling, to make it softer and to eliminate any folds present and, therefore, to prepare it for the subsequent stages of processing.
  • the material is, indeed, subjected to mechanical action due to its rolling inside the hollow cylindrical (often perforated) basket or barrel that constitutes the main part of the machine (or drum) and which operates by rotating around a generally horizontal transverse axis.
  • the product is cooled by circulation of cold air inside the cylindrical barrel which constitutes the main component of the drum.
  • an industrial plant for milling leathers - to be submitted for example to a simple fulling operation (word, the latter, commonly used in the tannery sector to indicate that processing - dry or through chemical products allowing to get special fashion effects on the leather - of the leather which provides for its softening by means of mechanical shaking inside the cylindrical barrel of the drum, under controlled temperature and humidity conditions)
  • a fulling drum which, in turn, includes a hollow, usually cylindrical, body, made for instance of wood, stainless steel or polypropylene and suitable to be rotated around a symmetry axis by motorization means and inside which the leathers to be treated are received.
  • the hollow body arranged horizontally is supported by a hollow shaft, placed on supporting members (such as typically ball or roller bearings) which allow it to rotate under the action impressed by the motorization means; the cavity in the shaft allows to introduce into the cylindrical body the water and the substances necessary for the tanning and the escape of the gases that are formed during the process.
  • supporting members such as typically ball or roller bearings
  • the hollow shaft is provided, at one of its ends, with a toothed crown which, by means of a pinion, is moved by the motorization means which cause the rotation of the cylindrical hollow body.
  • the inner surface of the hollow body is provided with protruding ribs (pegs, nervations, rounded blades) which increase the movement of the leathers when the cylindrical hollow body of the drum rotates around the symmetry axis.
  • protruding ribs pegs, nervations, rounded blades
  • the hollow (preferably cylindrical, as said) body of the drum presents a through opening for the introduction and extraction of the material, at which a water-tight revolving shutter (or door) is installed.
  • the through opening is opened manually, after stopping the drum rotation, while in the highly automated drums, normally called “automatic discharge” ones, the movement of the revolving shutter to open the through opening is impressed by automatic actuation devices (such as pneumatic actuators, electric motors or of other type), without the intervention of the operator and without stopping the drum rotation: in this way the leathers come out of the hollow body of the drum while it is rotating around the symmetry axis.
  • automatic actuation devices such as pneumatic actuators, electric motors or of other type
  • a central processing and control unit available to the user who schedules its operation, controls operation of the aforesaid automatic actuation devices and, in return, the movement of the shutter.
  • Suitable actuation means therefore, selectively and automatically place the shaped shutter between a first position, in which it completely and perfectly hermetically closes the through opening, and a second position in which the shaped shutter at least partly opens the through opening in order to allow the load in the inner volume of the hollow body of the leathers to be treated and/or the discharge from the inner volume of the hollow body of the leathers treated.
  • the shutter is opened in pre-set or steadily adjustable middle positions.
  • a typical industrial plant for milling tannery leathers of the type with automatic discharge of the prior art also includes a motorized conveyor belt (or tape), facing and underlying the hollow body of the drum: this conveyor belt receives the leathers just treated in the hollow body, from which they come by fall - automatic or favoured by the hand action of one or two operators -, when the shaped shutter takes the second position, and conveys the leathers treated far away from the hollow body.
  • This plant design has been consolidated for years in the leather tanning sector, allowing a more or less efficient management of the leathers discharge phase from the hollow body of the drum where they have just been subjected to a milling cycle.
  • Such a management of the discharge of the leathers from the drum - especially while it is kept in rotation - is in any case widely improvable and to perfect, in consideration of the fact that, at present, the leathers falling on the motorized conveyor belt are not efficiently and promptly processed by the belt itself, in the sense that they are not so quickly conveyed to the end of the conveyor belt which is placed frontally to the hollow body of the rotatable drum and is accessible by the operators: in practice, this end of the conveyor belt is opposed to that one below the hollow body and closer to the through opening of the hollow body from which the leathers come out while it rotates around the horizontal symmetry axis.
  • an auxiliary slide is mounted, placed above the conveyor belt and side-by-side to the hollow body of the drum and whose function is to ease the rapid, guided and gentle passage of the leathers from the hollow body to the conveyor belt.
  • the auxiliary slide is arranged next to the hollow body along an oblique direction defining with the direction defined by the conveyor belt below it an angle of not less than 90°, at the structural discontinuity zone between the auxiliary slide and the conveyor belt.
  • This general situation causes a relevant disadvantage consisting in that, currently, some (if not many) of the leathers, already exiting from the hollow body of the rotating drum, progressively and however minimally pile up on the conveyor belt at such a structural discontinuity zone between the auxiliary slide and the conveyor belt (especially if it defines an angle of about 90°), with the concrete risk that their accumulation on the conveyor belt increases until it comes into contact and rub against the outer wall of the hollow body, with all the notable disadvantages and dangers that this entails (damage to part of the leathers with consequent their derating, involuntary collection of the leathers from the conveyor belt by the rotatable drum, leaking of the leathers from the conveyor belt and their accidental impact or inclusion in the geared motor-belts towing system of the drum, under stress functioning of the rotatable drum and consequent dangers for the operator).
  • primary purpose of the invention is to provide an industrial plant (or group of equipment) for milling tannery leathers that avoids or at least considerably reduces with respect to the prior art the risk of accumulation of leathers on the conveyor belt underlying the hollow body of the drum from which they come out while it is rotating.
  • main purpose of the invention is to devise an industrial plant for milling tannery leathers allowing a conveyance towards the collection station of the leathers, coming out from a rotating drum inside which they've just been treated, more effective and faster than what is offered by equivalent plants of known type.
  • the industrial plant for milling tannery leathers of the invention avoids and in any case certainly limits considerably with respect to the plants of the current state of the art the risk that the leathers falling from the hollow body of the rotatable drum dangerously accumulate or pile up on the underlying conveyor belt.
  • the industrial plant for milling tannery leathers of the present invention eases the conveyance towards the collection station (where the operator or operators are placed) of the leathers falling from the hollow body of the rotatable drum of the automatic discharge type.
  • the industrial plant for milling tannery leathers of the current invention limits risks of damage (and of degrading if not of destination to waste) of the leathers, by avoiding their contact with the outer wall of the drum hollow body.
  • the risks for the operator and for the machinery - in particular the rotatable drum and the geared motor-belts towing system associated therewith - are drastically limited by the industrial plant of the current invention, compared to what negatively happens in the known technique.
  • the industrial plant for milling tannery leathers shortens the time of discharging the leathers from the rotatable drum to the conveyor belt with respect to the current state of the art, since, thanks to the avoidance - through the curved profile of the conveyor belt - the accumulation of the leathers in a certain zone of the conveyor belt itself, it is still possible to foresee, with respect to the similar existing plants, less stoppages of the rotation of the hollow body of the drum and less cycles of movement of the shaped shutter for open and close the through opening of such a hollow body.
  • the innovative technical concept underlying the invention can also be extended to industrial plants for milling tannery leathers yet existing and/or operative in the tanning field, by replacing the existing conveyor belts and even the auxiliary slide with the conveyor belt having an at least partly curved profile with concavity facing towards the outer wall of the hollow body of the rotatable drum.
  • the industrial plant (or group of equipment or machinery) for milling tannery leathers of the invention is illustrated in an example manner in a first embodiment thereof in figure 1 , where it is globally numbered with 1.
  • the industrial plant 1 for milling leathers comprises:
  • the conveyor belt 8 in transversal section made in the longitudinal direction of the conveyor belt 8, the conveyor belt 8 itself presents a curved profile 8' having concavity facing towards the hollow body 4 (in this case, this concavity affects almost the entire longitudinal development of the conveyor belt 8), at least in the linear portion L of the conveyor belt 8 onto which the just treated leathers fall from the hollow body 4 of the rotatable drum 3 through said through opening 5.
  • the linear portion L of the curved profile 8' of the conveyor belt 8 is underlying the hollow body 4 and faces the through opening 5 when the latter takes the spatial position which allows the leaking of the leathers from the inner volume 7 of the hollow body 4.
  • the curved profile 8' of the conveyor belt 8 which has the concavity facing towards the outer wall 4a of the hollow body 4 substantially coincides with the entire longitudinal development of the conveyor belt 8, net of what will be seen shortly.
  • the curved profile 8' of the conveyor belt (or tape) 8 departs from a first end 8a arranged substantially near a point in the space A at the height of which the treated leathers project outwardly from the through opening 5 (shaped shutter 6 in the aforementioned second position) or start coming out from the hollow body 4 through the through opening 5 itself.
  • the first end 8a of the conveyor belt 8 is located just beyond the height of the horizontal hollow shaft (not shown for the sake of simplicity) which supports the hollow body 4 and, in essence, little beyond the symmetry axis X of the latter.
  • the curved profile 8' of the conveyor belt 8 faithfully follows the profile 4' of the hollow body 4 from which it is separated by a prefixed distance D which preferably, remains constant along substantially the entire longitudinal development of the curved profile 8' of the conveyor belt 8 (which, as said, almost coincides with the entire longitudinal development of the conveyor belt 8) remains constant along substantially the whole longitudinal development.
  • a prefixed distance D - which creates a gap between the hollow body 4 of the rotatable drum 3 and the conveyor belt 8 - presents a value between 30 cm and 150 cm and, preferably, is equal to 40 cm or 50 cm.
  • the curvature radius of the curved profile 8' of the conveyor belt 8 depends on the curvature radius of the hollow body 4, in the case - as that one described herein purely by preferred way - in which it is cylindrical.
  • both the upper surface 8c and the lower surface 8d of the conveyor belt 8 present, in this case, preferably but not exclusively, the same profile, so that the upper surface 8c is concave and the lower surface 8d is convex.
  • the curved profile 8' of the conveyor belt 8 extends for a length equal to at least the maximum width dimension T of the hollow body 4, as well illustrated in figure 1 .
  • such a maximum width dimension T corresponds to a diameter since, as said, the hollow body 4 is, in a preferred but not exclusive way, cylindrical.
  • the conveyor belt 8 preferably surrounds almost half the perimeter (perimeter which in this case is constituted by a circumference) of the hollow body 4, ensuring effective sliding and conveying towards the collection station of the leathers when they fall on it.
  • the conveyor belt 8 presents:
  • the conveyor belt 8 comprises a horizontal end section of collection 9 at the second end 8b to which the treated leathers are conveyed in order to make them available to an operator P ready to pick them up and allocate them for the partial storage.
  • the conveyor belt 8 has a transverse development, orthogonal to the longitudinal development, at least partly greater than the maximum width dimension of the through opening 5 of the hollow body 4: generally, such a transversal development of the conveyor belt 8 normally has a value equal to the maximum width dimension T of the hollow body 4 and in any case never less than the maximum width dimension of the through opening 5 which, generally, coincides with a length since the through opening 5 itself has, preferably, a rectangular profile with base parallel to the symmetry axis X of the hollow body 4.
  • the construction composition of the conveyor belt 8 is of the type per se known in the field, providing a continuous and very regular support plane, movable around end rollers and made of plastic material, such as PVC, polyurethane or silicone polymers.
  • the conveyor belt 8 is also, for the most part, interposed between the support framework 2 and the hollow body 4 of the rotatable drum 3, in order to reduce the impact of its overall dimensions as much as possible.
  • actuation means comprise any of the linear actuation systems selected from the group consisting of pneumatic actuators, hydraulic actuators, electric motors and/or similar and are operatively connected with a central processing and control unit (not illustrated) available to the operator P which, by activating the actuation means, determines the automatic passage of the shaped shutter 6 from the first position to the second position and vice versa.
  • FIG. 2 shows a possible embodiment of the invention where the industrial plant for milling tannery leathers, now globally indicated with 50, differs from that one yet described, indicated with 1 and shown in figure 1 , for including also guide means, in the form in this case of an auxiliary slide 58 coupled with the support framework 51 and arranged above a first end 57a of the conveyor belt (or tape) 57 forming its structural continuation, since the auxiliary slide 58 is provided with a first face 58a, facing towards the hollow body 53 of the rotating drum 52, at least partly concave. More specifically and preferably, a lower portion 58b of the auxiliary slide 58 surmounts or overlaps the conveyor belt 57 at the first end 57a closest to the point of fall of the leathers on the conveyor belt 57.
  • the leathers progressively exit from the through opening 5 of the hollow body 4 of the rotatable drum 3 at each rotation of the hollow body 4 around the symmetry axis X: they fall on the underlying linear portion L of the curved profile 8' of the conveyor belt 8 and are by this conveyed to the horizontal end section of collection 9 where the operator P picks them up and orders them according to the processing requirements downstream the industrial plant for milling leathers 1 of the invention.
  • the curved profile could have concavity facing towards the hollow body of the rotatable drum only in the linear portion of the conveyor belt on which the leathers in exit of the hollow body fall, or in a length of the conveyor belt greater than such a linear portion but lower than the whole longitudinal development of the conveyor belt itself.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Treatment And Processing Of Natural Fur Or Leather (AREA)

Claims (14)

  1. Installation industrielle (1 ; 50) pour le foulage de cuirs comprenant :
    - un bâti de support (2; 51) approprié pour reposer sur une surface de référence (R) d'une usine industrielle ;
    - un tambour rotatif (3; 52) couplé audit bâti de support (2; 51) et comprenant un corps creux (4 ; 53) approprié pour recevoir les cuirs à traiter, définissant un axe de symétrie (X) autour duquel ledit corps creux (4 ; 53) est mis en rotation par des moyens de motorisation associés audit bâti de support (2 ; 51) et ayant une ouverture traversante (5 ; 54) au niveau de laquelle un obturateur profilé (6) est couplé de manière pivotante avec ledit corps creux (4 ; 53) et coopère avec des moyens d'actionnement appropriés pour le placer entre une première position, dans laquelle ledit obturateur profilé (6) ferme hermétiquement ladite ouverture traversante (5 ; 54), et une seconde position dans laquelle ledit obturateur profilé (6) ouvre au moins partiellement ladite ouverture traversante (5 ; 54) pour le chargement, dans le volume interne (7) dudit corps creux (4 ; 53), desdits cuirs à traiter et/ou le déchargement, à partir dudit volume interne (7) dudit corps creux (4 ; 53), desdits cuirs traités ;
    - une bande transporteuse motorisée (8 ; 57), au moins partiellement face et sous-jacente audit corps creux (4 ; 53) et qui :
    • reçoit lesdits cuirs traités, arrivant par chute à partir dudit corps creux (4 ; 53), lorsque ledit volet profilé (6) prend ladite seconde position ;
    • transporte lesdits cuirs traités à distance dudit corps creux (4 ; 53), caractérisée en ce que, dans une section transversale réalisée dans la direction de développement longitudinal de ladite bande transporteuse (8 ; 57), ladite bande transporteuse (8 ; 57) présente un profil incurvé (8') ayant une concavité faisant face audit corps creux (4 ; 53) au moins dans la partie linéaire (L) de ladite bande transporteuse (8 ; 57) sur laquelle lesdits cuirs traités chutent, sortant dudit corps creux (4 ; 53) dudit tambour rotatif (3 ; 52) à travers ladite ouverture traversante (5 ; 54).
  2. Installation (1 ; 50) selon la revendication 1), caractérisée en ce que ladite partie linéaire (L) dudit profil incurvé (8') de ladite bande transporteuse (8 ; 57) est sous-jacente audit corps creux (4 ; 53).
  3. Installation (1 ; 50) selon la revendication 1) ou 2), caractérisée en ce que ledit profil incurvé (8') de ladite bande transporteuse (8 ; 57) part d'une première extrémité (8a) disposée sensiblement près d'un point dans l'espace (A) à la hauteur duquel lesdits cuirs traités se projettent vers l'extérieur à partir de ladite ouverture traversante (5 ; 54) ou commencent à sortir dudit corps creux (4 ; 53) à travers ladite ouverture traversante (5 ; 54).
  4. Installation (1 ; 50) selon l'une quelconque des revendications précédentes, caractérisée en ce que ledit profil incurvé (8') de ladite bande transporteuse (8 ; 57) suit le profil (4') dudit corps creux (4 ; 53) duquel il est séparé par une distance préfixée (D) qui reste constante le long dudit profil incurvé (8') de ladite bande transporteuse (8 ; 57).
  5. Installation (1 ; 50) selon l'une quelconque des revendications précédentes, caractérisée en ce que ledit profil incurvé (8') de ladite bande transporteuse (8 ; 57) s'étend sur une longueur égale à au moins la dimension de largeur maximale (T) dudit corps creux (4 ; 53).
  6. Installation (1 ; 50) selon la revendication 5), caractérisée en ce que ladite dimension de largeur maximale (T) correspond à un diamètre lorsque ledit corps creux (4 ; 53) est cylindrique.
  7. Installation (1 ; 50) selon l'une quelconque des revendications précédentes, caractérisée en ce que ladite bande transporteuse (8 ; 57) encercle presque la moitié du périmètre dudit corps creux (4 ; 53).
  8. Installation (1 ; 50) selon l'une quelconque des revendications précédentes, caractérisée en ce que ladite bande transporteuse (8 ; 57) présente :
    - une première extrémité (8a) placée latéralement près d'un premier point (S1) de la dimension de largeur horizontale maximale (T) dudit corps creux (4 ; 53) ;
    - une seconde extrémité (8b), opposée à ladite première extrémité (8a), placée près de la partie sous-jacente dudit corps creux (4 ; 53) et de la projection verticale sur ladite surface de référence (R) d'un second point (S2), opposé audit premier point (S1), de ladite dimension de largeur horizontale maximale (T) dudit corps creux (4 ; 53).
  9. Installation (1 ; 50) selon l'une quelconque des revendications précédentes, caractérisée en ce que ladite bande transporteuse (8 ; 57) comprend une section d'extrémité horizontale de collecte (9) à une extrémité (8b) vers laquelle lesdits cuirs traités sont transportés afin de les rendre disponibles pour un opérateur (P).
  10. Installation (1 ; 50) selon l'une quelconque des revendications précédentes, caractérisée en ce que ladite bande transporteuse (8 ; 57) possède un développement transversal, orthogonal à ladite extension longitudinale, au moins partiellement plus grand que la dimension de largeur maximale de ladite ouverture traversante (5 ; 54) dudit corps creux (4 ; 53).
  11. Installation (50) selon l'une quelconque des revendications précédentes, caractérisée en ce qu'elle comprend une goulotte auxiliaire (58), couplée audit bâti de support (2 ; 51) et agencée au-dessus d'une première extrémité (57a) de ladite bande transporteuse (57) qui constitue son prolongement structurel étant donné que ladite goulotte auxiliaire (58) est munie d'une première face (58a), faisant face vers ledit corps creux (53), au moins partiellement concave.
  12. Installation (50) selon la revendication 11), caractérisée en ce que la partie inférieure (58b) de ladite goulotte auxiliaire (58) surmonte ou chevauche ladite bande transporteuse (57) à ladite première extrémité (57a) au plus près du point de chute desdits cuirs sur ladite bande transporteuse (57).
  13. Installation (1 ; 50) selon l'une quelconque des revendications précédentes, caractérisée en ce que lesdits moyens d'actionnement comprennent l'un quelconque des systèmes d'actionnement linéaires sélectionnés parmi le groupe constitué des actionneurs pneumatiques, des actionneurs hydrauliques, des moteurs électriques et/ou similaires et sont reliés de manière opérationnelle à une unité centrale de traitement et de commande disponible pour l'opérateur (P) qui, par l'activation desdits moyens d'actionnement, détermine le passage automatique de ladite porte profilée (6) de ladite première position à ladite seconde position et vice versa.
  14. Installation (1 ; 50) selon l'une quelconque des revendications précédentes, caractérisée en ce que ledit obturateur profilé (6) passe de ladite première position à ladite seconde position tandis que ledit corps creux (4 ; 53) dudit tambour (3 ; 52) continue à tourner autour dudit axe de symétrie (X).
EP19707472.7A 2018-02-05 2019-01-30 Installation industrielle de foulage de cuirs Active EP3749788B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT201800002404A IT201800002404A1 (it) 2018-02-05 2018-02-05 Impianto industriale per la bottalatura di pelli
PCT/IB2019/050733 WO2019150268A1 (fr) 2018-02-05 2019-01-30 Installation industrielle de foulage de cuirs

Publications (2)

Publication Number Publication Date
EP3749788A1 EP3749788A1 (fr) 2020-12-16
EP3749788B1 true EP3749788B1 (fr) 2021-11-17

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EP19707472.7A Active EP3749788B1 (fr) 2018-02-05 2019-01-30 Installation industrielle de foulage de cuirs

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EP (1) EP3749788B1 (fr)
CN (1) CN111971399B (fr)
BR (1) BR112020015843A2 (fr)
IT (1) IT201800002404A1 (fr)
WO (1) WO2019150268A1 (fr)

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* 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
CN115651993B (zh) * 2022-11-05 2023-08-15 江西兆丰皮业有限公司 一种牛头层防水磨砂皮革生产装置及方法

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US2282530A (en) * 1942-05-12 Apparatus fob cleaning and sorting
ES436896A1 (es) * 1975-04-17 1975-07-16 Cots Perfeccionamientos en bombos para el tratamiento de pieles.
CN2773088Y (zh) * 2005-03-01 2006-04-19 辛集巨龙皮革机械有限公司 不锈钢全自动摔软转鼓
CN204111770U (zh) * 2014-07-23 2015-01-21 南通思瑞机器制造有限公司 一种新型皮革处理用散皮机构
CN106435052A (zh) * 2016-12-20 2017-02-22 新昌县金裕装饰有限公司 一种环保且便于出料的皮革鞣制转笼

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CN111971399B (zh) 2022-03-18
IT201800002404A1 (it) 2019-08-05
EP3749788A1 (fr) 2020-12-16
CN111971399A (zh) 2020-11-20
WO2019150268A1 (fr) 2019-08-08
BR112020015843A2 (pt) 2020-12-08

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