EP2149399A1 - Auftragskopf - Google Patents

Auftragskopf Download PDF

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Publication number
EP2149399A1
EP2149399A1 EP09166926A EP09166926A EP2149399A1 EP 2149399 A1 EP2149399 A1 EP 2149399A1 EP 09166926 A EP09166926 A EP 09166926A EP 09166926 A EP09166926 A EP 09166926A EP 2149399 A1 EP2149399 A1 EP 2149399A1
Authority
EP
European Patent Office
Prior art keywords
coating head
head according
jet coating
jet
lips
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.)
Withdrawn
Application number
EP09166926A
Other languages
English (en)
French (fr)
Inventor
Giancarlo Barazzuol
Luca Camedda
Manila Chieruzzi
Alessandro Mario Ferrario
Paolo Fino
Laura Fuso
Attilio Gondolo
José Maria Kenny
Antonio Stefani
Andrea Terenzi
Massimo Zambon
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.)
Comecart Costruzioni Meccaniche Cartiere SpA
Original Assignee
Comecart Costruzioni Meccaniche Cartiere 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 Comecart Costruzioni Meccaniche Cartiere SpA filed Critical Comecart Costruzioni Meccaniche Cartiere SpA
Publication of EP2149399A1 publication Critical patent/EP2149399A1/de
Withdrawn legal-status Critical Current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
    • B05C5/00—Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work
    • B05C5/02—Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work the liquid or other fluent material being discharged through an outlet orifice by pressure, e.g. from an outlet device in contact or almost in contact, with the work
    • B05C5/0254—Coating heads with slot-shaped outlet

Definitions

  • the present invention relates to a jet coating head for coating sheet paper, film, metal or similar.
  • the present invention relates to a jet coating head for surface coating a paper strip.
  • Commonly used papermaking machines normally feature a coating device for liquid coating a surface of a paper strip to improve the appearance and print quality of the paper.
  • a typical coating device as described, for example, in EP0403845 , comprises a jet coating head for applying the coating liquid to one surface of the paper strip, as the strip is fed with the opposite surface resting on a rotating supporting roller.
  • the jet coating head extends along a longitudinal axis parallel to the axis of the supporting roller, and defines an inner chamber, which receives the pressurized coating liquid from one or more lateral inlets, and distributes the coating liquid over an axial length at least equal to the width of the strip.
  • the coating liquid issues from the chamber through a longitudinal slit defined by two facing lips, and is fed onto the surface of the strip to form a coating over the whole width of the strip.
  • the outlet of the longitudinal slit faces upwards, so the jet coating head is commonly known as a coating "fountain”.
  • the coating device Downstream from the jet coating head in the travelling direction of the paper strip, the coating device also comprises a scraper blade for removing surplus liquid applied to the strip and so achieve an evenly thick coating.
  • the jet coating head is normally made of stainless steel, which has several drawbacks.
  • the jet coating head is particularly heavy and therefore difficult to handle for assembly and/or maintenance.
  • the handling problem is further compounded by the size of the jet coating head, which, having to be at least as long as the width of the strip, may be several metres in length.
  • the longitudinal slit the coating liquid comes out of is not exactly straight, and the distance between the lips is not stable or constant over the whole width of the paper strip, due to thermal expansion of the material the jet coating head is made of, and flexural deformation caused by the weight of the head itself.
  • a coating liquid jet coating head as claimed in Claim 1.
  • FIG. 1 shows a schematic section of a preferred embodiment of the coating liquid jet coating head according to the present invention.
  • Number 10 in Figure 1 indicates as a whole a jet coating head for applying a coating liquid 4 to one surface of a paper strip 3, as paper strip 3 is fed with the opposite surface resting on a supporting roller 2 rotating about its own axis.
  • the axis of supporting roller 2 is not shown, and is perpendicular to the Figure 1 plane.
  • Jet coating head 10 is fixed to supporting flanges not shown, extends along a longitudinal axis 31 parallel to the axis of supporting roller 2, and has a cross section of constant shape and size along substantially its whole length.
  • Jet coating head 10 comprises one or more bodies, e.g. two bodies 11, 12, having respective opposite surfaces 23, 24 defining a chamber 5.
  • Chamber 5 receives the pressurized coating liquid 4 from one or more lateral inlets (not shown) at the axial ends of jet coating head 10, and defines a manifold elongated along longitudinal axis 31 to a length at least equal to the width of paper strip 3.
  • Bodies 11, 12 comprise respective portions 32, 33 having surfaces 34, 35 contacting each other to fluidtight seal the whole length of chamber 5, and are fixed to each other by appropriate fasteners, e.g. bolts or screws 38 holding together portions 32, 33.
  • bodies 11, 12 have respective lips 13, 14. Lips 13, 14 have respective faces 15, 16 spaced apart to define a longitudinal slit 17, and are fixed to bodies 11, 12 in fixed positions, but which can be adjusted to adjust the distance between faces 15, 16.
  • Slit 17 extends to a length at least equal to the width of paper strip 3, extends in cross section in a substantially straight direction radial with respect to longitudinal axis 31, and connects chamber 5 to the outside to feed coating liquid 4 onto paper strip 3 and form a coating 6 over the full width of the strip.
  • a scraper blade 7 is fitted to a support 8 downstream from jet coating head 10 in the travelling direction of paper strip 3, and serves to remove surplus liquid applied to the strip and so obtain an evenly thick coating 6.
  • bodies 11, 12 are made at least partly of composite polymer-matrix material.
  • bodies 11, 12 have respective "sandwich” structures. That is, bodies 11, 12 comprise respective shells or skins 18, 19 made of composite polymer-matrix material; and respective cores 20, 21 made of foam material and encased completely in shells 18, 19 along the periphery shown in cross section.
  • Polymer-matrix composite material is intended here to mean a material comprising a polymer phase, in which a number of fibres are embedded.
  • Epoxy or vinylester or polyester resins may be used as the polymer phase.
  • the polymer phase preferably comprises an epoxy resin with a vitreous transition temperature T g of over 70°C, which is higher than the operating temperature of jet coating head 10.
  • Epoxy resin has the major advantage of enabling the above vitreous transition temperature to be achieved without recourse to painstaking post-curing treatments, and is also highly compatible with carbon fibres.
  • the resin known by the trade name ELANTAS EC 57 - K31 may be used.
  • the fibres embedded in the polymer phase may be carbon, Kevlar®, glass or basalt fibres, or hybrid strengtheners of combinations of these.
  • the fibres are preferably continuous carbon fibres of a length ranging between a few centimetres and the whole length of the coating head or, if this comprises a number of connected modules, the whole length of each component module.
  • the quantity of fibres used conveniently equals over 45% by volume of the total volume of composite polymer-matrix material.
  • Shells 18, 19 preferably comprise a number of superimposed layers of continuous fibres within the polymer matrix.
  • the layers may be of two types, used singly or combined : layers of one-way fibres, e.g. parallel to axis 31; and woven layers.
  • the fibres in the superimposed layers are conveniently oriented in various directions with respect to longitudinal axis 31, to achieve the necessary mechanical strength in all possible stress directions.
  • shells 18, 19 can be obtained with a Young's modulus of over 30 GPa, over 30 MPa tensile strength, and less than 3% extensibility.
  • shells 18, 19 can be achieved with a modulus of over 5 GPa and flexural strength of over 250 MPa.
  • Cores 20, 21 may be made of polyurethane, PET, polystyrene or PVC foam, or other commonly used sandwich structure cores may be used.
  • cores 20, 21 are made of closed-cell polyurethane foam, such as the foam known by the trade name Strategic Cell h80.
  • Lips 13, 14 are made from the same composite polymer-matrix materials described above for shells 18, 19.
  • the reinforcing fibres are one-way, are arranged in layers, and are oriented in different directions with respect to longitudinal axis 31 to achieve rigidity and dimensional stability of the distance between faces 15, 16.
  • lips 13, 14 may be made of steel with a solid structure, as in known technology : the smaller thickness of lips 13, 14 with respect to bodies 11, 12 and, possibly, the presence of threaded inserts for assembling and adjusting the distance between lips 13, 14, make a solid structure preferable.
  • lips 13, 14 may also have a sandwich structure identical to that of bodies 11, 12, i.e. comprise respective shells and cores made of the materials described above with reference to bodies 11, 12.
  • lips 13, 14 form one piece with bodies 11, 12, i.e. the composite polymer-matrix materials of bodies 11, 12 and lips 13, 14 are seamless.
  • Coating liquid 4 deposited on paper strip 3 is erosive both by nature and due to the outflow speed from chamber 5 and, especially, through slit 17.
  • surfaces 23 and 24 and/or faces 15 and 16 are protected with a corrosion-resistant surface coating (in particular, more corrosion-resistant than the composite polymer-matrix material).
  • the coating of chamber 5 and/or slit 17 comprises a gel phase with a filler of ceramic, e.g. alumina, particles.
  • a filler of ceramic e.g. alumina, particles.
  • the coating is applied directly to the shell surfaces and lip faces during the composite polymer-matrix material production process.
  • the coating comprises plasma-deposited amorphous (diamond-like) carbon or alumina
  • the coating comprises epoxy resins with a filler of fullerene-type nanoparticles of over Shore 80 surface hardness.
  • the coating of faces 15, 16 and surfaces 23, 24 is preferably a gel with a ceramic particle filler, e.g. an epoxy gel with a filler of preferably over 10% by weight of alumina particles ranging in average size between a few nanometres and hundreds of microns.
  • a ceramic particle filler e.g. an epoxy gel with a filler of preferably over 10% by weight of alumina particles ranging in average size between a few nanometres and hundreds of microns.
  • the surface coating is particularly advantageous where the flow speed of coating liquid 4 is fastest, i.e. at faces 15, 16 of lips 13, 14.
  • the composite polymer-matrix material shells are made using so-called "liquid molding” techniques. Once formed, the sandwich structure undergoes a temperature-activated curing cycle. And, finally, post-curing treatment is performed to raise the vitreous transition temperature T g of the composite polymer-matrix material resin to over 70°C.
  • lips 13, 14 are fixed to bodies 11, 12, and jet coating head 10 is fixed to the supporting flanges using threaded fasteners, by embedding threaded inserts, e.g. threaded bushings, in the composite polymer-matrix material.
  • the inserts may be embedded directly at the laminating stage of the composite polymer-matrix material production process, or later by inserting the inserts inside holes and fixing them with adhesives or the composite polymer-matrix material resin itself.
  • the holes are formed directly at the laminating stage or after forming the sandwich structures, by numerical-control machining.
  • jet coating head 10 comprises a number of modules made separately, placed together along longitudinal axis 31 to ensure fluidtight sealing along chamber 5 and slit 17, and fixed to one another using adhesive and/or mechanical fastening devices.
  • jet coating head 10 as a whole has superior mechanical properties, particularly in terms of flexural strength, is lightweight, and has a low coefficient of thermal expansion, by virtue of the properties of the composite polymer-matrix material and, in particular, of the sandwich structure of bodies 11, 12.
  • the rigidity of the composite polymer-matrix material in fact, is combined with a density of less than 2 kg/dm 3 , i.e. less than a quarter of that of steel normally used in this application.
  • the composite material of epoxy resin and carbon fibres has a high degree of corrosion resistance and dimensional stability, by virtue of the low thermal expansion of the carbon fibres.
  • foam with a density of less than 0.25 kg/dm 3 , for the core also aids in reducing the overall specific weight of the sandwich structure of bodies 11, 12.
  • jet coating head 10 as a whole substantially depend on the thickness of shells 18, 19, which is preferably over 2 mm.
  • jet coating head 10 is highly resistant to bending stress, without recourse to complicated temperature regulating systems.
  • a jet coating head in accordance with the invention has been designed with the following characteristics:
  • Maximum deformation of the above jet coating head is less than 0.2 mm, determined by finite-element analysis.
  • jet coating head 10 as described herein without, however, departing from the scope of the present invention as defined in the accompanying Claims.
  • jet coating head 10 may have a differently shaped and/or proportioned cross section from that shown by way of example; and/or lips 13, 14 may comprise metering appendixes or devices at the outlet of slit 17.

Landscapes

  • Coating Apparatus (AREA)
  • Particle Formation And Scattering Control In Inkjet Printers (AREA)
EP09166926A 2008-07-31 2009-07-31 Auftragskopf Withdrawn EP2149399A1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
ITTO2008A000601A IT1393989B1 (it) 2008-07-31 2008-07-31 Testa di patinatura a getto

Publications (1)

Publication Number Publication Date
EP2149399A1 true EP2149399A1 (de) 2010-02-03

Family

ID=40717001

Family Applications (1)

Application Number Title Priority Date Filing Date
EP09166926A Withdrawn EP2149399A1 (de) 2008-07-31 2009-07-31 Auftragskopf

Country Status (3)

Country Link
EP (1) EP2149399A1 (de)
CN (1) CN101648176A (de)
IT (1) IT1393989B1 (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2013208511A (ja) * 2012-03-30 2013-10-10 Mitsubishi Materials Corp 塗布工具
CN113118006A (zh) * 2021-03-04 2021-07-16 南昌大学 一种狭缝涂头的表面处理方法
EP4245424A4 (de) * 2020-11-11 2024-05-22 Panasonic Intellectual Property Management Co., Ltd. Vorrichtung zur beschichtung einer elektrodenmischungsaufschlämmung

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT515673B1 (de) * 2014-05-07 2015-11-15 Haas Food Equipment Gmbh Wechselbarer Cremestreichkopf
CN110052365A (zh) * 2019-05-10 2019-07-26 北京派和科技股份有限公司 一种分体式喷嘴及采用该分体式喷嘴的点胶阀
CN110976226B (zh) * 2019-12-23 2021-12-17 深圳斯多福新材料科技有限公司 涂胶贴合一体机
CN112718399B (zh) * 2021-03-31 2021-08-06 江苏时代新能源科技有限公司 涂布组件及涂布装置

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0403845A2 (de) 1989-06-20 1990-12-27 Mitsubishi Jukogyo Kabushiki Kaisha Beschichtungsvorrichtung
US20010008118A1 (en) * 2000-01-14 2001-07-19 Richard Bernert Coating machine for direct or indirect coating of a material web
US6319316B1 (en) * 1998-02-17 2001-11-20 Fastar, Ltd. System and method for performing low contamination extrusion for microelectronics applications
WO2008141820A1 (de) * 2007-05-21 2008-11-27 Fmp Technology Gmbh Mundstück zum beschichten eines substrats mit einer flüssigkeit

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0403845A2 (de) 1989-06-20 1990-12-27 Mitsubishi Jukogyo Kabushiki Kaisha Beschichtungsvorrichtung
US6319316B1 (en) * 1998-02-17 2001-11-20 Fastar, Ltd. System and method for performing low contamination extrusion for microelectronics applications
US20010008118A1 (en) * 2000-01-14 2001-07-19 Richard Bernert Coating machine for direct or indirect coating of a material web
WO2008141820A1 (de) * 2007-05-21 2008-11-27 Fmp Technology Gmbh Mundstück zum beschichten eines substrats mit einer flüssigkeit

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2013208511A (ja) * 2012-03-30 2013-10-10 Mitsubishi Materials Corp 塗布工具
EP4245424A4 (de) * 2020-11-11 2024-05-22 Panasonic Intellectual Property Management Co., Ltd. Vorrichtung zur beschichtung einer elektrodenmischungsaufschlämmung
CN113118006A (zh) * 2021-03-04 2021-07-16 南昌大学 一种狭缝涂头的表面处理方法
CN113118006B (zh) * 2021-03-04 2023-01-31 南昌大学 一种狭缝涂头的表面处理方法

Also Published As

Publication number Publication date
CN101648176A (zh) 2010-02-17
ITTO20080601A1 (it) 2010-02-01
IT1393989B1 (it) 2012-05-17

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