EP3601622A1 - Improved drum for the milling treatment of leathers - Google Patents
Improved drum for the milling treatment of leathersInfo
- Publication number
- EP3601622A1 EP3601622A1 EP17823216.1A EP17823216A EP3601622A1 EP 3601622 A1 EP3601622 A1 EP 3601622A1 EP 17823216 A EP17823216 A EP 17823216A EP 3601622 A1 EP3601622 A1 EP 3601622A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- hollow body
- leathers
- drum
- air
- outer casing
- 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
Links
- 238000003801 milling Methods 0.000 title claims abstract description 44
- 230000003750 conditioning effect Effects 0.000 claims abstract description 34
- 238000010438 heat treatment Methods 0.000 claims abstract description 23
- 239000012530 fluid Substances 0.000 claims abstract description 6
- 239000004020 conductor Substances 0.000 claims abstract description 3
- 239000000463 material Substances 0.000 claims description 10
- 238000012545 processing Methods 0.000 claims description 9
- 239000011248 coating agent Substances 0.000 claims description 6
- 238000000576 coating method Methods 0.000 claims description 6
- 239000004698 Polyethylene Substances 0.000 claims description 4
- 229920000573 polyethylene Polymers 0.000 claims description 4
- 239000007769 metal material Substances 0.000 claims description 3
- -1 polyethylene Polymers 0.000 claims description 3
- 238000011144 upstream manufacturing Methods 0.000 claims description 3
- 230000001419 dependent effect Effects 0.000 claims description 2
- 238000001914 filtration Methods 0.000 claims description 2
- 239000004033 plastic Substances 0.000 claims description 2
- 229920003023 plastic Polymers 0.000 claims description 2
- 239000004814 polyurethane Substances 0.000 claims description 2
- 239000000843 powder Substances 0.000 claims description 2
- 239000002023 wood Substances 0.000 claims description 2
- 230000000284 resting effect Effects 0.000 abstract 1
- 230000008901 benefit Effects 0.000 description 7
- 230000007246 mechanism Effects 0.000 description 7
- 238000004519 manufacturing process Methods 0.000 description 4
- 238000010276 construction Methods 0.000 description 3
- 238000009434 installation Methods 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 230000002860 competitive effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000010985 leather Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- 239000004743 Polypropylene Substances 0.000 description 1
- 230000004913 activation Effects 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 230000000670 limiting effect Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000013021 overheating Methods 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000010992 reflux Methods 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
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
- C14B1/40—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.
- 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.
- FIG. 1 is a schematic and simplified top plan view of the improved drum of the invention, in an operative condition
- figure 2 is an enlargement of a constructive assembly of figure 1;
- figure 3 is another enlargement of the constructive assembly of figure 1;
- figure 4 is an enlarged detail of figure 3.
- 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:
- bearing frame generically numbered with 2 and only partly visible (not contributing to the innovative technical concept underlying the current invention), suitable to rest on a reference surface (not shown) of an industrial factory;
- a movable hollow body 3 coupled with the bearing frame 2 and made of at least partly thermally conductive material (for instance stainless steel), suitable to receive in its inner volume 4 the leathers to be treated by milling;
- thermally conductive material for instance stainless steel
- - motorization means not represented for the sake of exposition convenience, operatively connected (or keyed) with the movable hollow body 3 in such a way as to place it in rotation around a linear axis X when the leathers must be treated in the inner volume 4 of the hollow body 3;
- an outer casing 5 coupled with the bearing frame 2 and completely surrounding the movable hollow body 3 with which it defines an annular space (or peripheral chamber) 6 which presents dimensions in width depending on the overall dimensions of the improved drum 1, generally not more than 20 ⁇ 25 cm.
- the improved drum 1 comprises a conditioning circuit, in the whole signaled with 7, cooperating with the movable hollow body 3 through air Ai 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 Ai 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 A2 independent and distinct from the air Ai 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 Ai 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:
- first heating means indicated as a whole with 13, arranged between the first diverter valve 12 and the movable hollow body 3.
- the conditioning circuit 7 defines a closed loop path in such a manner that the air Ai 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. It is stated precisely that 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:
- a second fan 16 in contact with the external environment adjacent to the hollow body 3 and suitable for conveying air A2 into the inner volume 4 of the hollow body 3 itself; - a second diverter or exchange valve 17, placed downstream the second fan 16 considering the direction of flow of the air A2 at the input into the movable hollow body 3;
- the auxiliary conditioning circuit 9 defines a closed-loop path in such a manner that the abovementioned air A2 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. Furthermore, by observing figure 1, it is possible to state that also for the second heating means 18, comprising for example at least one electrical resistance, they are arranged upstream the axial entry duct 19 made in the hollow body 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 A2 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 A2 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.
Landscapes
- 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)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
IT102017000031928A IT201700031928A1 (en) | 2017-03-23 | 2017-03-23 | PERFECTED BOTTAL FOR THE TREATMENT OF BOTTALING OF THE SKINS |
PCT/IB2017/057604 WO2018172837A1 (en) | 2017-03-23 | 2017-12-04 | Improved drum for the milling treatment of leathers |
Publications (2)
Publication Number | Publication Date |
---|---|
EP3601622A1 true EP3601622A1 (en) | 2020-02-05 |
EP3601622B1 EP3601622B1 (en) | 2022-06-29 |
Family
ID=59521551
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP17823216.1A Active EP3601622B1 (en) | 2017-03-23 | 2017-12-04 | Improved drum for the milling treatment of leathers |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP3601622B1 (en) |
CN (1) | CN110402291B (en) |
BR (1) | BR112019019398B1 (en) |
IT (1) | IT201700031928A1 (en) |
WO (1) | WO2018172837A1 (en) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
IT201900016685A1 (en) * | 2019-09-19 | 2021-03-19 | Erretre Spa | METHOD OF EXECUTION OF A BOTTLING CYCLE OF LEATHER |
IT202000019624A1 (en) * | 2020-08-07 | 2022-02-07 | Erretre Spa | INDUSTRIAL LEATHER DRUMING PLANT WITH IMPROVED ENVIRONMENTAL IMPACT |
CN113862403A (en) * | 2021-11-10 | 2021-12-31 | 无锡市新达轻工机械有限公司 | Cold air type temperature and humidity control leather softening machine system |
Family Cites Families (5)
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 (en) * | 1998-05-27 | 1999-11-29 | Erretre Srl | FOLLONING, DYEING AND RECONNECTION BOTTLE |
ITVI20050041A1 (en) * | 2005-02-15 | 2006-08-16 | Erretre Spa | BOTTLE OF FOLLONING, DYEING AND RECONCIA |
CN203247270U (en) * | 2013-01-30 | 2013-10-23 | 温州致富皮业有限公司 | Casing structure of leather milling drum |
WO2015181691A1 (en) * | 2014-05-26 | 2015-12-03 | Cos.T.A. S.R.L. | Thermostatically controlled cylinder for heat treatments, method for making said cylinder and system comprising said cylinder |
-
2017
- 2017-03-23 IT IT102017000031928A patent/IT201700031928A1/en unknown
- 2017-12-04 WO PCT/IB2017/057604 patent/WO2018172837A1/en unknown
- 2017-12-04 EP EP17823216.1A patent/EP3601622B1/en active Active
- 2017-12-04 BR BR112019019398-7A patent/BR112019019398B1/en active IP Right Grant
- 2017-12-04 CN CN201780087938.3A patent/CN110402291B/en active Active
Also Published As
Publication number | Publication date |
---|---|
CN110402291B (en) | 2021-08-10 |
CN110402291A (en) | 2019-11-01 |
BR112019019398A2 (en) | 2020-04-14 |
EP3601622B1 (en) | 2022-06-29 |
BR112019019398B1 (en) | 2023-05-16 |
WO2018172837A1 (en) | 2018-09-27 |
IT201700031928A1 (en) | 2018-09-23 |
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