EP4029611A1 - Maschine für die behandlung einer papiertrennbahn mit einer chemischen substanz zum auftragen auf ein leder. - Google Patents

Maschine für die behandlung einer papiertrennbahn mit einer chemischen substanz zum auftragen auf ein leder. Download PDF

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Publication number
EP4029611A1
EP4029611A1 EP22151610.7A EP22151610A EP4029611A1 EP 4029611 A1 EP4029611 A1 EP 4029611A1 EP 22151610 A EP22151610 A EP 22151610A EP 4029611 A1 EP4029611 A1 EP 4029611A1
Authority
EP
European Patent Office
Prior art keywords
reel
leather
casing
support
machine
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.)
Pending
Application number
EP22151610.7A
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English (en)
French (fr)
Inventor
Gianni Maitan
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.)
GE MA TA SpA
Original Assignee
GE MA TA 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 GE MA TA SpA filed Critical GE MA TA SpA
Publication of EP4029611A1 publication Critical patent/EP4029611A1/de
Pending legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C1/00—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating
    • B05C1/04—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating for applying liquid or other fluent material to work of indefinite length
    • B05C1/08—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating for applying liquid or other fluent material to work of indefinite length using a roller or other rotating member which contacts the work along a generating line
    • B05C1/0817—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating for applying liquid or other fluent material to work of indefinite length using a roller or other rotating member which contacts the work along a generating line characterised by means for removing partially liquid or other fluent material from the roller, e.g. scrapers
    • 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
    • C14B7/00—Special leathers and their manufacture
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D2203/00—Other substrates
    • B05D2203/24—Leather
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D2252/00—Sheets
    • B05D2252/04—Sheets of definite length in a continuous process
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06N—WALL, FLOOR, OR LIKE COVERING MATERIALS, e.g. LINOLEUM, OILCLOTH, ARTIFICIAL LEATHER, ROOFING FELT, CONSISTING OF A FIBROUS WEB COATED WITH A LAYER OF MACROMOLECULAR MATERIAL; FLEXIBLE SHEET MATERIAL NOT OTHERWISE PROVIDED FOR
    • D06N3/00—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof
    • D06N3/0086—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof characterised by the application technique
    • D06N3/0095—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof characterised by the application technique by inversion technique; by transfer processes
    • D06N3/0097—Release surface, e.g. separation sheets; Silicone papers

Definitions

  • the present invention relates to a machine for the treatment of a support tape of a chemical substance to be applied to a leather and in particular for the treatment of a release paper tape.
  • ennobling layer a surface coating layer known as an "ennobling layer” to the leather in order to improve its aesthetic and/or tactile characteristics.
  • ennobling layer a surface coating layer
  • the support tape is generally made of suitably treated paper, which in the tanning industry is defined as “release paper” and this term will also be indicated in the present description, regardless of whether it consists of paper or other material suitable for the purpose.
  • the release paper tape wound on a reel, is installed in a production line, where it is unwound to receive the chemical substance which will then be transferred to the leather and will form the ennobling layer.
  • a leather processing line A according to the state of the art (see fig. 1 ) can comprise:
  • the elements described here are generally positioned one after the other along the processing line A, and therefore have a horizontal footprint, in particular the X axis. This footprint is undesirable since it requires to have available large buildings, capable of housing leather processing lines.
  • Document CN 209 099 037 discloses a leather processing line, in which the device that separates the leather from the release paper (indicated with the number 20 is located upstream of the reel on which the release paper is wound (indicated with the number 25). This solution is not fully satisfactory as it requires, as mentioned, buildings capable of housing machine of considerable horizontal dimensions.
  • the purpose of the invention is to propose a machine for the treatment of a support tape for a chemical substance to be apply to a leather, which allows to overcome the drawbacks of the known solutions.
  • Another purpose of the invention is to propose a compact and space-saving machine.
  • Another object of the invention is to propose a machine that can be easily integrated into a production line.
  • Another purpose of the invention is to propose a machine which allows to reduce the length of a production line for leather.
  • Another purpose of the invention is to propose a machine that takes up little horizontal space.
  • Another purpose of the invention is to propose a machine which allows to replace a release paper tape in a simple and rapid way.
  • Another purpose of the invention is to propose a machine which allows to maintain a high productivity in a leather production line.
  • Another purpose of the invention is to propose a machine which allows the interruptions of the production line to be reduced to a minimum when it is necessary to replace the reels of release paper.
  • Another purpose of the invention is to propose a machine which allows to clean the release paper from processing residues.
  • Another purpose of the invention is to propose a machine which is highly automated.
  • Another purpose of the invention is to propose a machine which allows to rewind the release paper in a quick and orderly manner.
  • Another purpose of the invention is to propose a machine which allows to vary the processing, and in particular the nature of the ennobling layer deposited on the leather, in a quick and simple way.
  • Another object of the invention is to propose a machine which is comfortable and simple to use.
  • Another purpose of the invention is to propose a machine that can be used in a production line in which processing tests are performed.
  • Another purpose of the invention is to propose a machine which can be manufactured quickly and easily and with low costs.
  • Another purpose of the invention is to propose a machine which is alternative and/or improved with respect to the known solutions.
  • the term “footprint” means the size of the projection of a certain device/machine/object on a certain axis, i.e. the “footprint along the X axis” corresponds to the size of the projection of a device/machine/object on the X axis, the “footprint along the Y axis” corresponds to the size of the projection of a device/machine/object on the Y axis, the “footprint along the Z axis” corresponds to the size of the projection of a device/machine/object on the Z axis.
  • the present invention concerns a machine, indicated as a whole with the number 1, for the treatment of a laminar support 2, on which a chemical substance is spread to be applied to a leather 4.
  • the invention relates to a machine for treating a release paper tape 2.
  • release paper tape 2 here we mean an element configured to be associated with and support a chemical substance and/or a material, which must be deposited on the surface of a leather, in order to modify its surface characteristics.
  • said chemical substance can be a paint, or a glue, or a chemical substance suitable for making a coating on said leather 4, such as a resin, preferably polymeric, or a polyurethane-based substance.
  • the chemical substance can have a liquid and/or viscous consistency, which makes it difficult to use within a production line, and for this reason it is deposited and/or associated with the release paper.
  • Release paper 2 in particular, can have a series of reliefs and/or engravings on the surface intended to come into contact with the chemical substance - i.e. be of the "embossed" type - or it can be substantially smooth.
  • the release paper 2 is generally presented in the form of a tape wound in reel 3, which is here defined as the first reel 3.
  • each first reel 3 can contain about 1000m of release paper, or even up to 2000m.
  • the reels are wound around axes having the ends 3' protruding laterally, and in particular with respect to the Y axis, from the overall dimensions of the reel and configured to couple with corresponding supports present in the machine 1, and more particularly in the casing 1', in order to substantially keep the reels in position.
  • the machine 1 according to the invention can preferably be positioned at one end of a leather processing line 100 and in particular it can be positioned at the opposite end with respect to that of introduction of the leather 4.
  • the X axis means the axis parallel to the advancement line of the leather 4 and of the release paper 2 along the production line 100.
  • the positive direction of the X axis is the direction of the advancement of the leather 4, while the negative direction of the advancement of the release paper 2 not yet coupled to the leather, as will become clear later.
  • the Z axis is substantially perpendicular to the X axis and the Y axis.
  • the machine 1 comprises a casing and/or external frame 1' configured to contain, at least partially, the different components of the machine itself.
  • the first reel 3 can be positioned at a height higher than the height at which the advancement line 104 of the leather and/or the advancement line 102 of the release paper are placed, at least at the reel itself.
  • the first reel 3 can be configured to rotate around its own axis in an idle way or, alternatively, it can be motorized.
  • the release paper 2 can be unwound and sent to a first return roller 6, which diverts the release paper 2 towards a cutting and jointing device 8 configured to cut and join the release paper 2.
  • a first return roller 6 can be positioned so that the release paper tape 2, in the path between the first reel 3 and the first deviating roller itself, is substantially vertical.
  • the cutting and jointing device 8 preferably comprises a cutting and jointing plane 9, configured to act as a support for the release paper tape 2 during the cutting and joining operations.
  • the cutting and jointing plane 9 can be substantially vertical or inclined with respect to the vertical.
  • the cutting and jointing device 8 can protrude horizontally with respect to the casing 1' of the machine 1, and substantially project over the processing line 100 of the leather 4, to which the machine 1 is associated. In this way it is easier for a user to move to the cutting and jointing plane 9 in order to cut the release paper tape 2. Conveniently, the cutting and jointing device 9 can therefore be displaced downstream with respect to the overall dimensions along the X axis of the first reel 3.
  • the cutting and jointing device 8 comprises an upstream stop 10 and a downstream stop 10' configured to stop in a stable and reversible way the advancement of the release paper tape 2.
  • the upstream stop 10 can comprise a stop element 14 configured to move in correspondence with the cutting and jointing plane 9, in order to cooperate with the latter in blocking the advancement of the release paper tape 2, and a handling element (not shown) configured to move said stop element between an active condition and an inactive condition.
  • the movement element can comprise a pneumatic or hydraulic cylinder.
  • the downstream stop 10' can preferably be substantially similar to the upstream stop 10, and therefore comprise a second movement element. Preferably the movement of the two stop elements 14 is independent.
  • the cutting and jointing device 8 can further comprise a cutting element (not shown) positioned between the two stops 10, 10' and configured to cut transversely the release paper tape 2 at a predefined position and/or selected by the user.
  • the cutting element can comprise a blade, for example positioned in correspondence with a slot obtained in the cutting and jointing plane 9.
  • the cutting element can be replaced by a user who manually cuts the release paper tape 2.
  • the cutting and jointing device 9 can be completely contained inside the casing 1'.
  • the cutting and jointing device can be only partially contained inside the casing 1', or it can be completely external with respect to the casing 1'.
  • the cutting and jointing device 8 can comprise a jointing element 18 configured to associate in a substantially stable manner two ends of the same release paper tape 2 or of two different release paper webs.
  • the jointing element 18 can be configured to associate the final end of a first release paper tape 2, for example the end of a finished and/or to be replaced tape and/or an end that has previously been cut by the cutting element, with the initial end of a second tape 2, for example of a tape to be started and/or of a tape that is substituted for the first.
  • the jointing element 18 can comprise an adhesive tape 20 which can be suitably moved by a third movement element 22 between a first position, in which it is substantially in contact with the ends of the release paper tapes 2, and a second position in which it is substantially separated or in any case not in contact with the release paper tapes 2.
  • the cutting and jointing plane 9 can end downstream with a second deflection roller 23, configured to direct the release paper tape 2 towards the subsequent components of the machine 1.
  • a third deflection roller 24 Downstream of the cutting and jointing device 8 there is a third deflection roller 24, which substantially defines the start of the transport line 102 for the release paper.
  • the third deflection roller 24 can be positioned so that the release paper tape 2 runs between the second deflaction roller 23 and the third deflection roller 24 substantially vertically, or in the direction substantially inclined with respect to the vertical, and preferably inclined in the negative direction of the X axis.
  • the release paper tape 2 leaves the machine 1 according to the invention and is transported by the advancement line 102 of the release paper through a plurality of further stations processing, better described below, up to station 106 where it is coupled with the leather 4.
  • the release paper tape 2 advances integrally with the leather 4 along their advancement line 104, until it re-enters the machine 1 according to the invention and, in particular, up to a fourth return roller 26, which directs it towards a detachment plane 28, where the leather 4 are separated from the release paper tape.
  • the separation can be carried out manually by an operator or in a mechanical and/or automated manner.
  • the detachment plane 28 is preferably oriented substantially vertically, or inclined with respect to the vertical.
  • the detachment plane 28 can be hinged to a pin 29 positioned at one of its ends, preferably at its upper end.
  • the detachment plane 28 can be made of aluminum, or sheet metal, or in any case it can be made in such a way as to have a limited weight, in order to be handled manually by an operator.
  • the detachment plane 28 can be moved by suitable mechanical and/or automatic movement means, such as a pneumatic or hydraulic cylinder, or a motor, preferably electric.
  • the detachment plane 28 can be contained at least partially, and preferably completely, inside the casing 1'.
  • the release paper tape 2 freed from the leather 4 is passed over a support cylinder 30, the function of which will become clear later, and subsequently through a straightening device 32, for example composed of a pair of rollers 34, 34' positioned so as to come into contact with the two opposite faces of the release paper tape 2, and configured to homogenize the tensions present on the two faces of the tape itself.
  • the support cylinder 30 can be located above the first reel 3, while the straightening device 32 can preferably be located substantially below the support cylinder 30 and in particular below the footprint along the axis X of the support cylinder 30.
  • the support cylinder 30 can be contained, preferably completely, inside the casing 1'.
  • the straightening device 32 can be contained, preferably completely, inside the casing 1'.
  • the tape is wound around a rotating axis supported at the ends by supports, similarly to the rotating axis of the first reel 3 and thus forms a second reel 36.
  • the portion of the rotation axis, on which the reel 36 is wound is only a part of the entire rotation axis, and in order to ensure correct winding of the reel itself, this can be of the self-centered type.
  • the second reel 36 can be mounted on a suitable centering device 37, configured to allow the release paper to be wound in a regular and orderly manner to form the reel.
  • said centering device 37 can comprise at least one element for recognizing the position of the release paper tape 2, for example a photocell coupled to a corresponding light source, or, more advantageously, at least two photocells (not shown) which can be positioned in correspondence of the two side edges of the release paper tape 2 and can be coupled to a same or to two light sources, configured to detect the position of the strip of release paper 2, and in particular its position along the Y axis.
  • the centering device 37 also comprises suitable handling means 37' configured to move the second reel 36 and/or the corresponding supports along the Y axis.
  • the second reel 36 can be completely included inside the casing 1'.
  • the centering device 37 can be completely included inside the casing 1'.
  • the second reel 36 can be positioned at a lower level than the first reel 3 and preferably in a lower staggered position with respect to the first reel 3. Furthermore, the second reel 36 can be advantageously positioned at a lower level than the support cylinder 30.
  • the machine 1 can comprise at least one pair of movable arms 38, and preferably two pairs of movable arms 38, each configured to move a corresponding reel 3, 36.
  • These movable arms 38 are configured to rotate around respective pins of articulation 35 between a first condition in which they are substantially horizontal, and a second condition in which they have an extremal portion 38' which is positioned at and/or near the ends 3', 36' of the shafts of the reels 3, 36, and a second extremal portion 38" which is positioned substantially higher - i.e. each movable arm 38 is in a substantially oblique position.
  • each pair of movable arms 38 is independent of the other, but at the same time is synchronized with that of the other movable arm 38 of the same pair.
  • each movable arm 38 can be moved by means of a suitable movement device 40, for example by means of a pneumatic or hydraulic cylinder, which causes its rotation between said first and said second condition around the respective pin 35.
  • the support cylinder 30 is configured to provide feedback to the release paper tape 2 when this is in correspondence with an apparatus 42 configured to carry out the removal of chemical product residues from the release paper tape itself.
  • the apparatus 42 in particular comprises at least one suitable first support 44 for a first material 46 configured to remove the first chemical substance from the release paper tape.
  • it can comprise a third reel 44 around which an adhesive tape 46 is rolled.
  • the third reel 44 can be associated with suitable braking devices (not shown) configured to reduce its rotation speed.
  • the apparatus 42 in particular comprises at least one suitable second support 48 for collecting the first material 46 once this has removed the first chemical substance from the release paper tape.
  • the apparatus 42 can be positioned in a position substantially above the support cylinder 30, and therefore in a position above the first reel 3.
  • the apparatus 42 can be positioned in a higher position than the second reel 36.
  • the first 3 and/or the second reel 36 and/or the support cylinder 30 can be positioned below the horizontal footprint, and in particular along the X axis, of the apparatus 42. Therefore, suitably, the apparatus 42 can be contained within inside of the casing 1'.
  • the adhesive tape 46 can be unwound from the third reel 44 through a return roller 49 to pass over a suitable cylinder and/or abutment plane 50.
  • the abutment cylinder 50 is positioned so that the adhesive tape 46, while passing in correspondence of its surface, substantially comes into contact with the release paper tape 2, which comes from the detachment plane 28.
  • the abutment cylinder 50 can be moved by suitable handling means (not shown), for example a pneumatic or hydraulic cylinder configured to maintain a predefined and/or user-set pressure between the adhesive tape 46 and the release paper tape 2 in order to allow the chemical to be removed from the release paper tape 2 by the adhesive tape 46.
  • the adhesive tape 46 is recovered from the second support 48, for example it is wound on the second reel 48.
  • the cylinder and/or abutment plane can be rubberized.
  • the machine 1 comprises a command and control unit (not shown) which controls at least one of the following:
  • command and control unit of the operation of the machine 1 according to the invention can coincide with the command and control unit of the operation of the leather production line 100 in which the machine 1 according to the invention is inserted.
  • the machine 1 can provide the first reel 3 and the cutting and jointing device 8 in an external position with respect to the casing 1', and preferably in an upstream position - i.e. in a position with lower X values - with respect to the casing 1'.
  • the second reel 3 can be positioned outside, that is, it does not have a cover casing. This makes it easier to replace the reel itself when necessary.
  • the first reel 3 can be separated from the casing 1' by a suitable platform 54 which allows the transit of an operator, in order to pick up the first reel when it is necessary to replace it.
  • said platform 54 can pass above the transport line 104 of the leather.
  • the movable arms 38, which support the second reel 36 can be configured to protrude from the casing 1', at least when they are in said second configuration, towards the upstream side - i.e. in the direction of the negative X. In this way it is possible to remove the second reel 36, when this becomes necessary, without having to rotate the detachment plane 28.
  • the rotation of the detachment plane 28 in fact requires cutting the release paper tape 2 in correspondence with the plane itself, at the in order to allow access to the second reel 36, and this is undesirable as it requires a considerable amount of release paper 2 to be wasted.
  • the user has direct access to the second reel 36, for example by means of a suitable opening obtained in the casing 1'.
  • the machine can have a horizontal footprint, and in particular along the X axis, at ground level of less than about 3.5 m, and preferably less than 1 m.
  • it can have a maximum horizontal dimension, and in particular along the X axis, lower than 1.5 m and more preferably lower than 1 m, while in the embodiment illustrated in figures 3a and 3b it can have a footprint, in particular along the X axis, of less than 3 m, more preferably less than 2.5 m.
  • the casing 1' can comprise at least partially, and preferably completely, inside at least the following components of the machine 1:
  • the casing 1' can also contain said first reel 3 and/or said cutting and jointing device 8, while in the embodiment represented in figures 3 and 4 the first reel 3 and/or said first return roller 6, and/or said cutting and jointing device 8, can be external with respect to the casing 1'.
  • the production line 100 which comprises the machine 1 according to the invention may comprise, preferably in order according to thedirection ascendingof the X axis:
  • the leather production line consists only of the stations listed here, preferably positioned in the order described here.
  • the line production 100 which comprises the machine 1 according to the invention may not comprise a traditional release paper accumulator.
  • the machine 1 according to the invention can be positioned downstream - i.e. at a higher value of X - with respect to the coating station.

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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)
  • Replacement Of Web Rolls (AREA)
EP22151610.7A 2021-01-18 2022-01-14 Maschine für die behandlung einer papiertrennbahn mit einer chemischen substanz zum auftragen auf ein leder. Pending EP4029611A1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT202100000779 2021-01-18

Publications (1)

Publication Number Publication Date
EP4029611A1 true EP4029611A1 (de) 2022-07-20

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ID=75252728

Family Applications (1)

Application Number Title Priority Date Filing Date
EP22151610.7A Pending EP4029611A1 (de) 2021-01-18 2022-01-14 Maschine für die behandlung einer papiertrennbahn mit einer chemischen substanz zum auftragen auf ein leder.

Country Status (1)

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EP (1) EP4029611A1 (de)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0300335A1 (de) * 1987-07-22 1989-01-25 Cometa Engineering S.R.L. Verfahren zum Zurichten von Häuten, Leder und derartigen faserigen Substraten
EP2857110A1 (de) * 2012-06-04 2015-04-08 Nitto Denko Corporation Beschichtungsvorrichtung
WO2017203425A1 (en) * 2016-05-25 2017-11-30 Cos.T.A. S.R.L. Method for making a multilayer laminar product and system thereto
CN209099037U (zh) 2018-10-12 2019-07-12 浙江禾欣新材料有限公司 一种合成革用高效省空间熟化系统

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0300335A1 (de) * 1987-07-22 1989-01-25 Cometa Engineering S.R.L. Verfahren zum Zurichten von Häuten, Leder und derartigen faserigen Substraten
EP2857110A1 (de) * 2012-06-04 2015-04-08 Nitto Denko Corporation Beschichtungsvorrichtung
WO2017203425A1 (en) * 2016-05-25 2017-11-30 Cos.T.A. S.R.L. Method for making a multilayer laminar product and system thereto
CN209099037U (zh) 2018-10-12 2019-07-12 浙江禾欣新材料有限公司 一种合成革用高效省空间熟化系统

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