EP1598115B1 - Appareil de couchage par rideau - Google Patents

Appareil de couchage par rideau Download PDF

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Publication number
EP1598115B1
EP1598115B1 EP05103793A EP05103793A EP1598115B1 EP 1598115 B1 EP1598115 B1 EP 1598115B1 EP 05103793 A EP05103793 A EP 05103793A EP 05103793 A EP05103793 A EP 05103793A EP 1598115 B1 EP1598115 B1 EP 1598115B1
Authority
EP
European Patent Office
Prior art keywords
coating
curtain
slot
web
coating color
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.)
Not-in-force
Application number
EP05103793A
Other languages
German (de)
English (en)
Other versions
EP1598115A3 (fr
EP1598115A2 (fr
Inventor
Hirofumi Morita
Akio Hirano
Hiroyuki Kohno
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.)
Voith Patent GmbH
Original Assignee
Voith Patent GmbH
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Filing date
Publication date
Application filed by Voith Patent GmbH filed Critical Voith Patent GmbH
Publication of EP1598115A2 publication Critical patent/EP1598115A2/fr
Publication of EP1598115A3 publication Critical patent/EP1598115A3/fr
Application granted granted Critical
Publication of EP1598115B1 publication Critical patent/EP1598115B1/fr
Not-in-force 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
    • B05C5/005—Curtain coaters

Definitions

  • the invention relates to a curtain coating with a coating head from which a coating color from a slit provided on the slot from above on a running underneath web, in particular paper or cardboard, falls and forms a coating curtain, which on one side of the aforementioned path arrives.
  • Coated papers such as catalogs, leaflets, thermal papers or automatically canceled tickets are made by applying a coating to the surface of a sheet of raw paper.
  • Machines for applying these coating colors are generally referred to as brushing machines, and those coating units which apply coating color to this web from a position above the web, which consists, for example, of paper or cardboard, are referred to as curtain coater.
  • the paint on the curtain head body 101 is delivered from the curtain coater 100 from above with respect to the conveyed web (not shown) so as to be perpendicular to the paper plane in FIG Fig. 6 (a) forms a curtain tc.
  • tc occurs at a low flow rate (from 6 to 7 l / min / m width and less) the problem on that, as in Fig. 6 (b) shown, due to the inwardly acting surface tension, the edge regions ce of the curtain tc are drawn inwards, whereby the curtain tc of the coating color t becomes unstable.
  • curtain coaters 200 at the two ends of the (not shown) slot, which is the discharge opening for the coating color in the head body body 201, guide rods gb or plates provided. With the aid of these devices, the curtain tc formed by the coating color t is guided and the destabilization of the curtain tc is avoided.
  • curtain coating units 100 in those instances where the flow rate of the dispensed coating paint t is low, there is generally the problem that the edge portions ce of the curtain tc are drawn inwardly, destabilizing the curtain tc of the coating color t leads.
  • the coating color t must always flow with a certain minimum flow rate, so that this deficiency can be eliminated. This results in the disadvantage that actually unnecessary coating color t is consumed.
  • the curtain coating unit 200 equipped with guide rods or plates also causes coating color t to adhere to the guide rods gb or plates and solidify there after drying. As a result, the curtain tc in disorder and the leadership functionality is lost.
  • guide rods gb or plates also have the disadvantage that they or the like in the execution of maintenance. to disturb. They thus lead to a decline in labor productivity.
  • the slot also forms at least one adjacent to the web surface, or outside the width of the web falling curtain part, wherein the slot in the area outside the web surface or the web width is at least partially formed wider than the slot, the remaining or actual curtain on the Railway surface gives off.
  • the invention thus enables good coating performance at a reduced coating color flow rate.
  • the slot is formed on the coating head so that at least one of its two edge-side ends is formed wider than the remaining part of the slot. This allows to reduce the width of the curtain coating.
  • An expedient embodiment of the inventive curtain coating unit is that the wider part of the slot has a width dimension, which is at least twice the width dimension of the remaining slot which is responsible for hitting the web is.
  • the flow rate of the coating exceeds a certain necessary level, so that the force acting in the curtain discharge direction increases and an even more stable coating color curtain is obtained.
  • the at least one wider slot has the shape of a rectangle, circle, oval or the like at the edge end.
  • the coating head is made up of two bodies, the widened slot being incorporated only in one body or in both bodies.
  • the coating head is thus easier to produce.
  • the curtain coating machine can be further designed by the widened slot at a certain distance from at least one edge end of the coating head or its body is arranged. He therefore does not need to be located at the extreme end, but may also be positioned at other locations outside the web width.
  • the curtain coating 1 of this first embodiment is, as in FIG Fig. 1 (a) shown to a device which applies to the surface of a base paper web 2 a coating color t, wherein the web 2 is conveyed at a speed of 100 to 2000 m / min in the direction indicated by ⁇ arrow.
  • Fig. 1 (b) shows a view of in Fig. 1 (a)
  • the curtain coater 1 dispenses a coating color t which is supplied via a coating ink supply inlet tk to the chamber of a coating head 3 discussed in more detail below, via a slot s1 and the wider slits s2 in the form of a curtain tc on the upper side of the conveyed web 2.
  • coating curtain part (inner part) tc1 and tc2 are called edge-side curtain part.
  • a coating color layer is formed in a predetermined thickness of, for example, 10 to 50 microns on the top of the web 2.
  • this curtain coating 1 is that the thickness m c1 for the inner part of the coating color curtain tc1 above the top of the web 2 0.3 mm are specified, while the thickness m c2 of the edge coating curtain parts tc2, which forms part of Show paint curtain next to the top of the web 2, 1 to 3 mm are given.
  • higher flow rates are achieved in the coating color curtain parts tc2 at the two side edges than in the inner part of the coating color curtain tc1.
  • a resistance to the surface tension acting with orientation inwards on the marginal coating color curtain parts tc2 is built up and thus a stabilization of the coating color curtain tc is achieved.
  • This feature makes it possible for the curtain coater 1 to provide a given application performance with a given coating color amount t at a low flow rate.
  • the coating color t delivered from the slits s1 and s2 provided on the coating head 3 forms the coating color curtains tc1 and tc2 and is then applied in a predetermined thickness to the upper side of the web 2.
  • the collected coating color t is returned to a tank, not shown, and recycled together with newly supplied coating color t with a predetermined pressure by means of a pump. After defoaming, filtration and the like, it is then passed over the coating ink supply inlet tk of the chamber 3c (see. Fig. 2 (a) which has a cross section along the straight line BB in Fig. 1 (b) shows) of the coating head 3 supplied.
  • the coating color t conducted into the chamber 3c is discharged to the top of the web 2 for coating the top of the web 2 through the slots s1, s2 in the form of curtains tc1, tc2.
  • the brush shows how Fig. 1 (b) a body [3b], bilateral gaskets 3p sealing the body 3b and thus preventing leakage of the coating color t, and double-sided coating end plates 3e holding the gaskets 3p closely adjacent to the body 3b.
  • the slit s1 serves to form the inner coating color curtain tc1 and is provided on the coating head body 3b1, 3b2 with a width dimension m s1 of 0.3 mm, the slits s2 are again provided with a width m s21 of 1 to 3 mm at the seals 3p and serve to form the two marginal coating color curtain parts tc2.
  • a width m s1 0.3 mm for slit s1 and a width m s21 of at least 0.6 mm for slit s2 is preferred. In particular values of 1 to 3 mm have proven to be ideal.
  • the width dimension m s1 of slot s1 was selected as the width dimension m s1 of slot s1, but it is possible to specify values of 0.2 to 0.5 mm as the width dimension m s1 instead.
  • the width dimensions m s1 and m s21 for slit s1 and slit s2, respectively, can be suitably selected according to the coating conditions, such as the thickness of the coating color layer to be applied to the web 2.
  • the coating head body 3b has, as in Figs. 2 (a) and 2 (c) a first brush body 3b1 and a second brush body 3b2, which together form the body 3 and a coating head 3, respectively, and a first lip 311 and a second lip 312 received in the first and second brush bodies 3b1, 3b2, respectively, for adjustment serve the width of the slot s1.
  • the first and second spreader bodies 3b1, 3b2 are made of stainless steel, for example, as shown in FIG Fig. 1 (b) and Fig. 2 (c) 3, cutouts forming the chamber 3c of defined geometry and each side portion of the slit s1 having the predetermined width of 0.3 mm are formed in an elongated shape so as to be the width of the web 2 of 1 to 10 m or wider.
  • the lips 311, 312 are made of stainless steel, for example. In them a hole is drilled through which forms part of the 0.3 mm wide slot s1, as in Fig. 2 (a) shown by a (not shown) screw for adjusting and adjusting the width of the slot s1 is guided.
  • the seals 3p are in Fig. 2 (b) , a cross section along the straight line CC in Fig. 1 (b) , shown. These are, for example, components made of rubber or rubber, for example butadiene rubber.
  • a hole 3p1 corresponding to the chamber 3c in the coating head body 3b is formed in the gaskets.
  • the coating color t passes through Slot s2 flows at a higher flow rate than through slot s1. Accordingly, the coating color curtain tc2, tc2 discharged from slit s2 is thicker than the coating color curtain tc1 discharged from slit s1.
  • the wider portion s21 of the slit s2 provided in the gasket 3p may be formed inwardly from the slit opening s2k over part of the entire length of the slit s2, but may be formed over the entire length of the slit s2 as it extends from the slit opening is shaped inside.
  • a flow rate of 7.4 l / min / m was previously required to achieve a given coating performance, as has been verified by adjusting the slot s1, (which defines the inside coating color curtain tc1 above the top of the web 2) and the width of the web corresponds to 2), to a width m s1 of 0.3 mm and adjusting the slits s2, which form the edge coating color curtain tc2 next to the top of the web 2 (ie outside the web width), to a width m s21 of 3 mm, a reduction of the coating color flow rate to 5.4 l / min / m can be achieved.
  • the invention thus enables a curtain coating unit that provides a stable coating color curtain at high coating rates and works with low coating color flow rates.
  • the application areas of curtain coating systems can be expanded and universal application areas for curtain coating systems can be developed.
  • FIG. 3 (a) and 3 (b) An enlarged view of the underside of the coating head 23 in Fig. 3 (a) instead of forming slits in the seals 23p, 23p, instead a slit 2s1 and wider slits 2s2 are provided exclusively in the slug body 23b.
  • an in-side coating color curtain 2tc1 is formed over the top of the web 22 by dispensing coating color t through the slit 2s1 provided in the coating head body 23b, and the high-rate edge coating paint curtains 2tc2, 2tc2 adjacent to the top surface of the web 22 become partially through Dispensing of coating color t formed by the slots 2s2, 2s2. This achieves a stabilization of the coating color curtains 2tc1 and 2tc2 and ensures the achievement of predetermined coating rates.
  • this curtain coating 21 as in FIGS. 3 (a) and 3 (c) , a cross section along the straight line DD of the coating head 23 in FIG Fig. 3 (a) to form the inside paint curtain 2tc1, there is formed a chamber 23c for supplying the first coat body 23b1 and the second coat body 23b2 with coating paint t and a slit 2s1 adjoining the chamber 23c and having a width dimension m s1 .
  • first and second coating head bodies 23b1, 23b2 are respectively provided a first and second lip 2311, 2312, at least one or both of which are adjustably held by a setting screw.
  • the slit 2s1 is formed so as to be connected to the first swab body 23b1 and the second swab body 23b2.
  • a first and a second lip 2311 and 2312 are provided, which are held adjustable by means of adjusting screws.
  • the slit 2s22 is formed so as to be connected to the first swab body 23b1 and the second swab body 23b2.
  • a slit 2s21 is provided which widens toward the first lip 2311 and has a width dimension m s21 which is larger than the width of slit 2s22.
  • width dimension m s1 of slit 2s1, over which the inside-side coating curtain part 2tc1 is formed is 0.3 mm
  • width dimension m s2 for the slits 2s2, over which the edge-side coating color curtain parts 2tc2 are formed at least 0.6 mm must be selected, however, it is preferably selected in a range of 1 to 3 mm.
  • Embodiment 2 By the features of Embodiment 2, the same advantages as described in Embodiment 1 are obtained.
  • Embodiment 2 In the following, two variations of Embodiment 2 will be described with reference to FIG Fig. 4 explained.
  • Embodiment 2 as in FIG Fig. 3 (b) shown in the extension of the slots 2s2, which form the edge-side coating curtain parts 2tc2, only an extension on the first Coating head body 23b1 made.
  • the slits 2s2' are instead provided so that, as in FIG Fig. 4 (a) , a drawing of the underside shown, their ends in each case by the same amount m3 in the first and second coat head body 23b1 ', 23b2' into expand.
  • the slits 2s2 ' are also arranged symmetrically to the plane in which the first swab body 23b1' adjoins the second swab body 23b2.
  • the slots can also be arranged asymmetrically to each other.
  • the wider slots 2s2 “must therefore not necessarily be formed at the two extreme ends of the coating color curtain, but can also be provided widened at other locations.
  • the widened slots can thus be positioned at the coating head so that their position is outside the top of the web 2 and destabilization of the curtain is avoided (cf. Fig. 1 (b) . Fig. 3 (a) ).
  • the position of the widened slots is thus by no means limited to a particular position.
  • the material in which the widened slots are provided can be chosen arbitrarily, for example, they can be provided widened slots on both the first and on the second coating head body, also they can, as in Example 1, in the coating head body seal or otherwise provided in that they connect both to the brush body and its seal.
  • FIG. 5 (a) As a cross section of the widened slots, a four-edged cross-section was shown in the embodiments 1 and 2, the in Fig. 3 (b)
  • shown cross-section of slot 2s2 can also, as in Fig. 5 (a) shown, run around
  • the in Fig. 4 (a) shown cross section of slot 2s2 ' As in Fig. 5 (b) shown, also run around.
  • the cross-section of the widened slots s2, 2s2, etc. may also take on a different shape, such as an ellipse or an oval or other shape, other than the four-edged or round shape shown in the embodiments, as long as it is ensured that the slot has a width in which the thickness of the curtain formed is at least twice the thickness of the curtain formed by the inner slit part s1, 2s1, etc.
  • Examples of application of the invention are brushes for painting cardboard and papers for calendars, catalogs, leaflets, thermal paper or pressure-sensitive paper, and brushes for one-sided coating of automatically debitable tickets with a magnetic coating color. As long as it concerns Streichwerke that apply a coating color on webs, the application possibilities of the invention are no limits.

Landscapes

  • Coating Apparatus (AREA)
  • Paper (AREA)
  • Curtains And Furnishings For Windows Or Doors (AREA)

Claims (4)

  1. Appareil de couchage par rideau (1) avec une tête de couchage (3) à partir de laquelle une encre de couchage (t) tombe de haut en bas hors d'une fente (s1) prévue sur la tête de couchage (3) sur une bande (2) circulant en dessous de celle-ci, en particulier une bande de papier ou de carton, et forme un rideau d'encre de couchage (tc), qui arrive sur une face de la bande précitée (2), dans lequel la fente forme également au moins une partie de rideau tombant à côté de la surface de la bande ou à l'extérieur de la largeur de la bande, dans lequel la fente est formée au moins partiellement de manière plus large dans la région située à l'extérieur de la surface de la bande ou de la largeur de la bande que la fente qui délivre le rideau sur la surface de la bande, et la fente est formée sur la tête de couchage de telle manière qu'au moins une de ses extrémités du côté du bord (s2) soit formée de manière plus large que la partie restante (s1) de la fente, caractérisé en ce que la partie plus large de la fente (s2) présente une dimension de largeur qui vaut au moins le double de la dimension de largeur de la ou des autres fentes (s1).
  2. Appareil de couchage par rideau selon la revendication 1, caractérisé en ce que la fente plus large (s2) présente la forme d'un rectangle, d'un cercle, d'un ovale, ou analogue.
  3. Appareil de couchage par rideau selon la revendication 1 ou 2, caractérisé en ce que la tête de couchage (3) est composée de deux corps (3b1, 3b2, 23b1, 23b2), dans lequel la fente élargie (s2) n'est pratiquée que dans un corps ou dans les deux corps.
  4. Appareil de couchage par rideau selon l'une quelconque des revendications 1 à 3, caractérisé en ce que la fente élargie (s2) est disposée à une distance (m4) de l'extrémité du côté du bord de la tête de couchage (3) ou du ou des corps.
EP05103793A 2004-05-18 2005-05-09 Appareil de couchage par rideau Not-in-force EP1598115B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2004147611A JP4542816B2 (ja) 2004-05-18 2004-05-18 カーテン式コータ
JP2004147611 2004-05-18

Publications (3)

Publication Number Publication Date
EP1598115A2 EP1598115A2 (fr) 2005-11-23
EP1598115A3 EP1598115A3 (fr) 2008-06-18
EP1598115B1 true EP1598115B1 (fr) 2012-04-25

Family

ID=34939726

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05103793A Not-in-force EP1598115B1 (fr) 2004-05-18 2005-05-09 Appareil de couchage par rideau

Country Status (4)

Country Link
US (1) US7820247B2 (fr)
EP (1) EP1598115B1 (fr)
JP (1) JP4542816B2 (fr)
AT (1) ATE554861T1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20080178799A1 (en) * 2007-01-30 2008-07-31 Hiroyuki Kohno Two-layer curtain coater system
DE102007000778A1 (de) 2007-09-27 2009-04-02 Voith Patent Gmbh Auftragsvorrichtung und Verfahren zum Betreiben einer Auftragsvorrichtung
JP4905817B1 (ja) * 2010-12-15 2012-03-28 大阪シーリング印刷株式会社 カーテンコーター、塗工液誘導具

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3341354A (en) * 1964-03-11 1967-09-12 Continental Oil Co Curtain coating method and apparatus for applying a non-uniform liquid coating material to sheet stock
JPS532108A (en) * 1976-06-28 1978-01-10 Fuji Photo Film Co Ltd Method of producing pressure sensitixed copy sheets
JPS582466Y2 (ja) * 1978-05-30 1983-01-17 野田合板株式会社 カ−テン．フロ−．コ−タ
JP2558883Y2 (ja) * 1991-12-13 1998-01-14 石川島播磨重工業株式会社 塗工装置
JPH081061A (ja) 1994-06-17 1996-01-09 Mitsubishi Paper Mills Ltd カーテン塗布方法及びその装置
JP3257340B2 (ja) * 1995-05-24 2002-02-18 松下電器産業株式会社 液体塗布方法、液体塗布装置およびスリットノズル
JPH0938559A (ja) * 1995-07-31 1997-02-10 Mitsubishi Alum Co Ltd カーテンコーターヘッド
JPH10165869A (ja) * 1996-12-10 1998-06-23 Mitsubishi Paper Mills Ltd カーテン塗布装置及び塗布方法
JP2000051762A (ja) * 1998-08-12 2000-02-22 Toshiba Emi Ltd 現像ノズル
JP2004033867A (ja) * 2002-07-02 2004-02-05 Fujitsu Ltd カーテンコーターノズル

Also Published As

Publication number Publication date
EP1598115A3 (fr) 2008-06-18
EP1598115A2 (fr) 2005-11-23
JP2005329280A (ja) 2005-12-02
JP4542816B2 (ja) 2010-09-15
US7820247B2 (en) 2010-10-26
ATE554861T1 (de) 2012-05-15
US20050271825A1 (en) 2005-12-08

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