EP2284315B1 - Vorhang-Auftragswerk - Google Patents

Vorhang-Auftragswerk Download PDF

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Publication number
EP2284315B1
EP2284315B1 EP10007598A EP10007598A EP2284315B1 EP 2284315 B1 EP2284315 B1 EP 2284315B1 EP 10007598 A EP10007598 A EP 10007598A EP 10007598 A EP10007598 A EP 10007598A EP 2284315 B1 EP2284315 B1 EP 2284315B1
Authority
EP
European Patent Office
Prior art keywords
curtain coater
guide channels
coater according
curtain
flow
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.)
Active
Application number
EP10007598A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP2284315A1 (de
Inventor
Eduard Dr. Davydenko
Andreas Pesch
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.)
Andritz Kuesters GmbH
Original Assignee
Andritz Kuesters GmbH
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 Andritz Kuesters GmbH filed Critical Andritz Kuesters GmbH
Priority to PL10007598T priority Critical patent/PL2284315T3/pl
Publication of EP2284315A1 publication Critical patent/EP2284315A1/de
Application granted granted Critical
Publication of EP2284315B1 publication Critical patent/EP2284315B1/de
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • 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
    • B05C11/00—Component parts, details or accessories not specifically provided for in groups B05C1/00 - B05C9/00
    • B05C11/10—Storage, supply or control of liquid or other fluent material; Recovery of excess liquid or other fluent material
    • B05C11/1002—Means for controlling supply, i.e. flow or pressure, of liquid or other fluent material to the applying apparatus, e.g. valves

Definitions

  • the invention relates to a curtain applicator for dispensing liquid or pasty application medium in the form of a substantially gravity-related moving curtain or veil on a moving surface, in particular of paper or cardboard.
  • Such a curtain coating unit comprises a nozzle chamber, which is supplied to the application medium via a supply line, and which emits the application medium through an outlet opening as a curtain or veil.
  • the curtain applicator is located at a distance from the substrate, resulting in the advantage of contactless application.
  • a distributor system with two chambers the so-called side-fed dual cavity die
  • the coating composition is passed through a first distribution chamber gap into a second distribution chamber.
  • the distributor chamber gap must produce a high flow resistance.
  • the resulting pressure in the first distribution chamber is significantly greater than the transverse pressure loss in the flow direction.
  • the pressure differences in the flow direction of the first distribution chamber are very small compared to the total pressure in the first distribution chamber.
  • the pressure distribution and thus the distribution of the volumetric flow density over the distributor chamber gap are thereby approximately uniform with large variations of the volumetric flows and the material parameters.
  • the remaining deviations are compensated in the second distribution chamber.
  • the distribution chamber gap must be made in small dimensions, which are in the range of 200 to 500 microns.
  • the volume flow deviations over the outlet width must not exceed a range of 1 to 2%.
  • the flat parts forming the distribution chamber gap must be made with a deviation from the parallelism in a range of ⁇ 1 to 3 microns.
  • the length of the distributor chamber gap is usually 20 to 40 mm.
  • the production cost of flat parts in such dimensions with the required precision, especially for large outlet widths of 10 to 12 m, is very large and associated with considerable costs.
  • a curtain applicator in which the nozzle body consists of two wall-shaped parts which have a desired working width corresponding length.
  • a longitudinal groove is incorporated, which forms a distribution chamber after the joining of the two parts.
  • To the distribution chamber an over the working width extending discharge channel is connected, from which the coating color emerges.
  • the flow conditions in the distribution chamber are influenced by the supplied volume flows.
  • At least two supply channels are connected to the distribution chamber, each having a device for adjusting the supplied volume flow of coating color.
  • a device for adjusting the supplied volume flow of coating color Preferably Schlauchklemm- or diaphragm valves are used for the flow adjustment.
  • the volume flows of each feed channel are therefore set separately.
  • a second distributor chamber is arranged between the distributor chamber and the outlet channel. Between the then first distribution chamber and the second distribution chamber is an additional flow channel. adversely again is the requirement of additional actuators for the cross profile adjustment. The associated cost is therefore large.
  • a slot die or a cascade die may be used.
  • a slot die also referred to as slot die
  • a single-layer curtain applicator the curtain forms directly at the exit from the die gap.
  • Curtain applicators with a slot nozzle are for example off DE-A1-197 16 647 known.
  • the object of the invention is therefore to provide a curtain applicator, which ensures a high uniformity of the distribution of a coating medium over an outlet width and is inexpensive to produce.
  • a flow gap is replaced by a plurality of guide channels.
  • Each guide channel comprises a pipe section, which is preferably a part with a circular cross section, and a downstream extension of the channel flow, the so-called diffuser of the guide channel.
  • the guide channels produce an approximately equal flow resistance as a flow gap.
  • the plurality of guide channels replace a flow gap between two distribution chambers.
  • a first and a second distribution chamber are then arranged one behind the other in the flow direction, and between them extends an additional flow gap, which is replaced according to the invention by a plurality of guide channels.
  • the pipe sections of the guide channels are preferably produced and used as turned parts in a simple manner. Elaborate high-precision flat machine width or output-width parts can be replaced by turned parts.
  • the invention relates to a curtain applicator for dispensing application medium in the form of a substantially gravitationally moving curtain to a moving paper or board web.
  • FIG. 1 and Fig. 2 show the curtain applicator according to the prior art to a nozzle body having a first, along a feed width extending manifold chamber 1.
  • This distribution chamber 1 is supplied via at least one supply line (not shown), the application medium.
  • the flow direction S of the application medium to be supplied can start from one end of the distribution chamber 1, as shown in FIG Fig. 1 is shown.
  • the nozzle body further comprises a second distribution chamber 3, which emits the application medium via a discharge gap 4 as a curtain. Between the first 1 and second distribution chamber 3, an additional flow channel 2 is provided, which is designed as a flow gap.
  • the flow direction S is perpendicular to the transverse direction of the curtain applicator.
  • the length l h and the height 2 h of the flow channel formed as a flow gap determine a flow resistance that is substantially equal in the transverse direction of the output width, since the flow gap is a continuous space.
  • the prerequisite for this, however, is a high degree of precision with regard to parallelism of the flow gap walls, so that the gap height 2 h remains the same over the gap length I h .
  • the problems set out in the background of the prior art occur in the production of the nozzle body, even if it is composed of two halves as usual.
  • FIG. 3 and FIG. 4 show the curtain applicator according to a first embodiment of the prior art differs in that the additional flow channel 2 is decomposed into a plurality of individual guide channels, the inlet side and along the feed width with spaced pipe sections 2.1 to the first distribution chamber. 1 connect.
  • the lengths and opening widths of the pipe sections 2.1 can be selected to equalize the flow resistance along the feed width.
  • the pipe sections 2.1 In the direction of flow S, the pipe sections 2.1 each pass into a diffuser 2.2 for merging the section streams of the guide channels on the outlet side.
  • a remaining partial height of the flow channel 3 may be formed in the form of a machine-wide flow gap to reunite the individual section streams from the individual guide channels, before the entry into the second distribution chamber 4 .
  • the second distribution chamber 4 is the application medium via a discharge gap 5 as a curtain.
  • the guide channels are preferably arranged in a base body 2.4 of the nozzle body.
  • the guide channels with pipe section 2.1 and 2.2 diffuser extending from the first distribution chamber 1 perpendicular to the transverse direction of the commissioned work, i. preferably perpendicular to the cross-machine direction (CD) of the moving paper or board web.
  • the guide channels are preferably arranged in a row for this purpose.
  • the flow resistances of the guide channels along the discharge width are substantially the same and are at least 1 mWS (9.81 kPa).
  • the pipe sections 2.1 of the guide channels preferably have a circular cross-section.
  • the first distribution chamber 1 can not have the same length over the feed width. With a supply of the application medium from one end, the distribution chamber 1 tapers towards the other end of the task opposite this task end. A homogenization of the volume flows is improved here if the lengths I r and / or the diameters of the pipe sections 2.1 and / or the distances x between each two guide channels along the outlet width are different. As Fig.
  • the number of guide channels per meter of the output width or outlet width is selectable. Preferably, the number of guide channels in the range between 10 and 33. To counteract edge currents, it is advantageous to make the distance x between the guide channels over the outlet width variable.
  • Fig. 5 to 7 show preferred details of a guide channel according to the invention.
  • the pipe sections 2.1 are preferably designed as exchangeable inserts. These inserts may have a chamfer on the inlet side and / or a rounding R.1.
  • the guide channels in the region of the outlet end on a web width b ⁇ 0.3 mm.
  • the guide channels can also have 2.2 rounded outlet ends at the respective diffuser.
  • the diffusers 2.2 preferably each inlet side a circular cross section, which merges into a rectangular cross section at the outlet.
  • the expansion angle ⁇ d of the flow-limiting walls of the diffusers 2.2 are preferably below 8 ° in order to avoid a backflow in the diffuser 2.2.
  • the gap height of the circular pipe section 2.1 of the guide channel is 2r 0 and a gap height of the diffuser 2.2 is denoted by 2H. It is advantageous if the diffuser 2.2 is designed so that an extension of the flow-limiting walls is provided.
  • Fig. 8 shows a schematic representation of the flow conditions in a guide channel with pipe section 2.1 and 2.2 diffuser.
  • the opening angle of the diffuser 2.2 is denoted by ⁇ d .
  • R denotes a radial distance.
  • the maximum flow velocity at a distance R is given as u max .
  • the diffuser 2.2 is preferably designed so that the velocity distribution of the diffuser flow has a high symmetry and a backflow is avoided. Due to the high viscosity of the coating and its relatively low velocity, this is a divergent Jeffery-Hamel flow.
  • the angle ⁇ d is preferably less than 25 °.
  • the flow-contacting parts of the curtain applicator are mechanically and chemically stressed. It is therefore advantageous to produce the guide channels or the replaceable inserts 2.1 and the base body 2.4, in which the diffuser 2.2 can be integrated, from stainless steels, for example from the following materials, such as molybdenum-free Cr-Ni steels, molybdenum-containing Cr-Ni. Steels or ferritic-austenitic duplex steels.
  • the base body may consist of a thermoplastic material.
  • the High-performance plastics such as PEI, PEEK, PPSU, PTFE, PVDF, POM according to DIN EN ISO 1043-1 as a material for producing the nozzle body, in particular of the base body 2.4.
  • the nozzle body described according to the invention can be used for a curtain coating by the slide-type method or a slot-type method.
  • Fig. 9 shows a second embodiment of the curtain applicator for dispensing order medium.
  • the nozzle body here has only a first, along a feed width extending manifold chamber 1 and a flow channel 2, which emits the application medium via the outlet gap 5 as a curtain.
  • the flow channel 2 is divided into a plurality of individual guide channels, as described above for the first embodiment. The above statements apply accordingly.

Landscapes

  • Coating Apparatus (AREA)
  • Formation And Processing Of Food Products (AREA)
  • Seal Device For Vehicle (AREA)
  • Massaging Devices (AREA)
  • Paper (AREA)
  • Polysaccharides And Polysaccharide Derivatives (AREA)
  • Saccharide Compounds (AREA)
EP10007598A 2009-08-10 2010-07-22 Vorhang-Auftragswerk Active EP2284315B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL10007598T PL2284315T3 (pl) 2009-08-10 2010-07-22 Powlekarka kurtynowa

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102009036853A DE102009036853B3 (de) 2009-08-10 2009-08-10 Vorhang-Auftragswerk

Publications (2)

Publication Number Publication Date
EP2284315A1 EP2284315A1 (de) 2011-02-16
EP2284315B1 true EP2284315B1 (de) 2012-01-04

Family

ID=42932662

Family Applications (1)

Application Number Title Priority Date Filing Date
EP10007598A Active EP2284315B1 (de) 2009-08-10 2010-07-22 Vorhang-Auftragswerk

Country Status (12)

Country Link
US (1) US20110030613A1 (pt)
EP (1) EP2284315B1 (pt)
JP (1) JP2011036856A (pt)
KR (1) KR20110016404A (pt)
CN (1) CN101992173A (pt)
AT (1) ATE540164T1 (pt)
BR (1) BRPI1002922A2 (pt)
CA (1) CA2710460A1 (pt)
DE (1) DE102009036853B3 (pt)
PL (1) PL2284315T3 (pt)
RU (1) RU2010133431A (pt)
ZA (1) ZA201005687B (pt)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2012179502A (ja) * 2011-02-28 2012-09-20 Nordson Corp スロットノズル組立体及びシム板
DE102011118053A1 (de) 2011-11-09 2013-05-23 Andritz Küsters Gmbh Vorhang-Auftragswerk
CN103706513B (zh) * 2012-09-28 2018-04-06 威亚光电子有限公司 用于将粘性材料层施加至基底上的作用元件、装置和方法
CN104722449A (zh) * 2015-04-09 2015-06-24 京东方科技集团股份有限公司 胶涂布头、涂胶设备及触控显示面板的制备方法
JP7377641B2 (ja) * 2019-07-31 2023-11-10 タツモ株式会社 塗布ノズル及び塗布装置
CN113171889B (zh) * 2021-04-27 2022-07-12 常州瑞择微电子科技有限公司 水帘喷头
CN114534993A (zh) * 2022-01-20 2022-05-27 安脉时代智能制造(宁德)有限公司 一种带有流量分配结构的涂布装置
EP4283039A1 (de) 2022-05-24 2023-11-29 Andritz Küsters GmbH Vorrichtung zum glätten und zum auftragen eines auftragsmediums

Family Cites Families (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4624213A (en) * 1985-08-27 1986-11-25 Armstrong World Industries, Inc. Curtain coating apparatus and method of use
FR2613642B1 (fr) * 1987-04-09 1990-12-21 Siderurgie Fse Inst Rech Dispositif de production d'un rideau de liquide
US5234330A (en) * 1991-06-14 1993-08-10 Eastman Kodak Company Dies
US5458836B1 (en) * 1994-03-11 1998-08-04 Du Pont Polymer extrusion die and use thereof
DE19716647A1 (de) * 1997-04-21 1998-10-22 Jagenberg Papiertech Gmbh Verfahren und Vorrichtung zum Auftragen einer Pigmentstreichfarbe auf eine Papier- oder Kartonbahn
DE19755625A1 (de) * 1997-12-15 1999-07-01 Jagenberg Papiertech Gmbh Schlitzdüse zum Beschichten von Materialbahnen, insbesondere Papier- oder Kartonbahnen mit Pigmentstreichfarbe
JP4200243B2 (ja) * 1998-03-25 2008-12-24 パナソニック株式会社 液体塗布装置
US6419747B1 (en) * 1999-02-26 2002-07-16 The Procter & Gamble Company Extrusion die
DE10057733A1 (de) * 2000-11-22 2002-05-23 Voith Paper Patent Gmbh Vorhang-Auftragsvorrichtung
US7329437B2 (en) * 2001-08-17 2008-02-12 Fujifilm Corporation Coating method and coating apparatus
DE10231276B4 (de) * 2002-07-10 2004-11-11 Mitsubishi Hitec Paper Flensburg Gmbh Beschichtungskopf
DE102007000782A1 (de) * 2007-09-27 2009-04-02 Voith Patent Gmbh Auftragsvorrichtung zum Auftragen wenigstens zweier Schichten auf eine Papier-, Karton- oder andere Faserstoffbahn
DE102008041423B4 (de) * 2008-08-21 2015-04-16 Fmp Technology Gmbh Fluid Measurements & Projects Beschichtungswerkzeug zum Auftragen eines Flüssigkeitsfilms auf ein Substrat

Also Published As

Publication number Publication date
JP2011036856A (ja) 2011-02-24
ZA201005687B (en) 2011-04-28
CN101992173A (zh) 2011-03-30
EP2284315A1 (de) 2011-02-16
ATE540164T1 (de) 2012-01-15
CA2710460A1 (en) 2011-02-10
RU2010133431A (ru) 2012-02-20
DE102009036853B3 (de) 2010-11-11
US20110030613A1 (en) 2011-02-10
PL2284315T3 (pl) 2012-06-29
KR20110016404A (ko) 2011-02-17
BRPI1002922A2 (pt) 2012-05-29

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