EP1861207B1 - Auftragsvorrichtung - Google Patents

Auftragsvorrichtung Download PDF

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Publication number
EP1861207B1
EP1861207B1 EP06707828A EP06707828A EP1861207B1 EP 1861207 B1 EP1861207 B1 EP 1861207B1 EP 06707828 A EP06707828 A EP 06707828A EP 06707828 A EP06707828 A EP 06707828A EP 1861207 B1 EP1861207 B1 EP 1861207B1
Authority
EP
European Patent Office
Prior art keywords
curtain
color
colour
coating
heads
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
EP06707828A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP1861207A1 (de
Inventor
Hirofumi Morita
Takeo Nakazawa
Junichi Ito
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
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 Voith Patent GmbH filed Critical Voith Patent GmbH
Publication of EP1861207A1 publication Critical patent/EP1861207A1/de
Application granted granted Critical
Publication of EP1861207B1 publication Critical patent/EP1861207B1/de
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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    • 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
    • B05C5/007—Slide-hopper coaters, i.e. apparatus in which the liquid or other fluent material flows freely on an inclined surface before contacting the work
    • B05C5/008—Slide-hopper curtain coaters
    • 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
    • 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
    • B05C9/00—Apparatus or plant for applying liquid or other fluent material to surfaces by means not covered by any preceding group, or in which the means of applying the liquid or other fluent material is not important
    • B05C9/06—Apparatus or plant for applying liquid or other fluent material to surfaces by means not covered by any preceding group, or in which the means of applying the liquid or other fluent material is not important for applying two different liquids or other fluent materials, or the same liquid or other fluent material twice, to the same side of the work

Definitions

  • the present invention relates to an application device for applying coating medium, for example paint in multiple layers on a running web surface.
  • curtain coaters pre-dosing applicators
  • colors ta, tb are applied to the surface of the web w by the colors ta, tb are discharged from the upper curtain heads 101 a, 101 b in a direction running in the direction of the arrow w to form color curtains ca, cb ,
  • the color ta as a first layer becomes the film surface and the color tb as a second layer applied to the paint applied to the film surface ta. There is little difference between the falling speed of the colors ta, tb and the running speed of the film.
  • the running speed of the web is high, 300 to 1800 m / min (5 to 60 m / sec) and the falling speed of the colors ta, tb is 3 m / sec, which is a speed difference between the two speeds on the order of 20 times.
  • the color ta applied as the first layer to the web w may be uniformly drawn over the area of the web w and normally applied without the formation of coating unevenness such as staining.
  • curtain coating methods generally require the formation of independent color curtains, when performing low speed coatings, curtains may be formed that become unstable are and tear easily. As a result, no normal coating can be achieved.
  • both the underlying and over-coated layers are slightly affected due to the thin film thickness of the inks used in the application process. This leads to a roughening of the coated surface.
  • the application of ink to the unused heads must be stopped upon completion of the application. If the ink supply to the unused heads is not stopped, mixing of the colors will occur when the apparatus is operated, whereby the colors can not be recovered independently.
  • the application when the paint is stopped to any of the heads, the application must be stopped and the heads cleaned. As used in this cleaning process If cleaning water flushes through the other heads during operation, all other heads must be stopped and cleaned simultaneously when the paint is stopped on any of the heads.
  • the slidable nozzle multi-layer coating method has problems in that color mixing occurs, the regulation of the colors of each layer is difficult, and all heads must be cleaned when changing the application. In addition, the process for starting and stopping the application is difficult.
  • the object of the present invention is to provide an applicator device which prevents formation of coating defects, such as staining, in the formation of plural layers of paint on a web surface and, moreover, produces coatings according to the liquid properties of the colors and recovery of excess paint is guaranteed.
  • the beam guiding part comprises a pair of wedge-shaped guide members which increase towards the downstream side, the spacing between them being the same dimension as the width of the paint used in the coating, the paint flowing between the pair of guide members being painted the web surface is usable and the color flowing along the outside of the pair of guide members color is recoverable.
  • the beam guiding part is arranged in the uppermost upstream curtain head.
  • the beam guiding part has a paint guide part for guiding the paint discharged from the curtain head to the guide surface inclination and a recovery guide part located adjacent to the paint guide part and in a different direction therefrom, and for redirecting the flow of excess paint. serves, exists.
  • An advantageous embodiment of the device is that a container is provided for collecting the discharged color from the curtain heads of the plurality of curtain heads, which are not used in the coating.
  • a circulation means is provided for recirculating the paint collected from the container to the curtain heads.
  • the applicator device of the present invention also includes a supply means for supplying water or the like to the curtain heads of the plurality of curtain heads which are not used in coating.
  • the apparatus also includes a container for catching water discharged from the curtain heads and the like, and a circulation means for recirculating the water caught by the container and the like to the curtain heads.
  • the applicator device according to the invention can also be designed such that a curtain delivered from a curtain head is larger or wider than the web or else smaller or narrower than the web.
  • all delivered curtains can have the same width.
  • the curtain delivered from a downstream curtain head is wider than the width of the sheet and the curtain from the adjacent upstream curtain head is narrower than the width of the sheet.
  • the second medium that is, that from the upstream curtain head medium is completely taken from the first medium (starting from the downstream curtain head).
  • the paint flowing in contact with the slope of the guide surface can be guided to flow smoothly over the guide surface slope and prevent coating defects.
  • curtain heads can be switched specifically during commissioning operation.
  • the curtain heads and pipes, etc. can be cleaned well by the circulation of water and the like.
  • FIG. 1 shows a schematic cross section of an applicator 1, in which the present invention is applied.
  • the path of a web w to be coated w in the direction of an arrow ⁇ (or an arrow ⁇ ) with different colors t1, t2, t3, t4 is shown on one side of the web w.
  • Four applied layers are formed.
  • FIG. 1 For example, where four applied layers are used, two, three or five or more layers may be used.
  • any height between the above-described curtain heads 21, 22, 23, 24 and the guide surface 3, as well as the distance between these curtain heads and the angle of these curtain heads is adjustable.
  • curtain heads 21, 22, 23, 24 are normally the same width (in the vertical direction in FIG. 1 ), these widths can also be changed in advance.
  • a device for separating the coating liquids between the outlets of the curtain heads 21, 22, 23, 24 and the farthest downstream end of the guide surface 3 is provided, through which the excess of the colors t1 , t1, t3 and t3 are recovered and the colors t1 t2, t3 t4 are applied as required in layers on the web w.
  • the web described above is moved in the direction of arrow ⁇ at a speed of, for example, 1200 m / min (20 m / sec).
  • the colors t1, t2, t3, t4 flowing in the laminated layers on the slope 3s pass from a curtain guide part 3g in the form of a color curtain tc onto the surface of the web w.
  • the curtain guide member 3g is continuously connected to the end portion of the inclination 3s of the guide surface 3.
  • the falling color curtain tc has, for example, a speed of 3 to 5 m / sec.
  • the curtain heads 21, 22, 23, 24 described above include collectors 21h, 22h, 23h, 24h.
  • the colors t1, t2, t3, t4 are supplied to each of the accumulators 21h, 22h, 23h, 24h at a prescribed pressure imparted either by respective pumps (not shown in the drawing) or another air pressure method.
  • the colors t1, t2, t3, t4 flow through nozzles 21n, 22n, 23n and 24n, respectively, so as to produce a film thickness of 50 to 300 ⁇ m at a speed of 1 to 5 m / sec.
  • the guide surface 3 described above is made of, for example, a stainless steel plate or a resin surface having a surface roughness of at most Ra 0.4.
  • the guide surface 3 is, as in the enlarged view of FIG. 2 (a) represented, arranged under each head.
  • the first curtain head 21 - see illustration in FIG. 2 (b) -
  • the first curtain head 21 and the guide surface 3 is sometimes in direct contact.
  • the range of a distance s between the curtain heads and the guide surface 3 is between 0.1 and 100 mm.
  • the downward-facing curtain guide member 3g is formed at the downstream end-part slope 3s directly under the nozzle 24n of the fourth curtain head 24 to the web w.
  • an inclination angle 3 ⁇ whose cardinal point is the end of the inclination 3s of the guide surface 3 is adjustable between about 15 and 60 ° and is set to 30 ° in this device. It should be noted that the inclination angle 3 ⁇ of the inclination 3s of the guide surface 3 is arbitrarily set.
  • the guide surface 3 of this embodiment describes a curved line in side view, it may be formed as a straight line.
  • FIG. 3 a shows a schematic view in the width direction.
  • the distance s between the curtain heads 21, 22, 23, 24 and the guide surface 3 is not adequate, there will be a loss of continuity of the colors t1, t2, t3, t4 and a loss of continuity of the color curtains tc1, tc2, tc3 and tc4, thereby hindering the generation of a uniform film pressure flow.
  • the distance s to be chosen depends on the color properties.
  • the color t1 discharged from the nozzle of the curtain head forms a color projection t1 a upon touching the inclination of the guide surface 3, hindering the generation of uniform film thickness flow along the inclination 3s.
  • the distance s between the curtain heads 21, 22, 23, 24 and the surface 3 corresponding to the color characteristics is set in a range of 0.1 mm to 100 mm. Or it can, as in FIG. 2 b shown, a uniform film thickness flow along the inclination 3s of the guide surface 3 are generated.
  • a beam guiding part 3f in the vicinity of the jet of the nozzle 21n for smoothly guiding the discharged paint t1 to the inclination 3s of the guide face 3, a normal coating is achieved.
  • beam guide parts 3f1, 3f2 and 3f3 in the second curtain head 22, third curtain head 23 and fourth curtain head 24 can be arranged. In these cases, they are made separately from the guide surface 3.
  • the beam guiding part 3f (see FIG. 2 b in the present embodiment) as an integral part of the guide surface 3, it may also be separate from the guide surface 3. Depending on which part is to be used, depending on the liquid properties of the paints and the dispensing conditions, etc., it is decided appropriately.
  • FIG. 4 a is a schematic enlarged view of the third curtain head 23 and the fourth curtain head 24 of FIG. 1
  • FIG. 4 b is a schematic view in the direction of arrow A of (a) thereof.
  • the color layers are formed by laminating the color t3 discharged from the third curtain head 23 and the color t4 output from the fourth curtain head 24 to the other colors t1, t2 on the slope 3s of the guide surface 3. From the color layers t1, t2, t3, t4, a color curtain tc reaches the surface of the web from the end part of the inclination 3s of the guide surface 3 or through the continuous curtain guide part 3g.
  • FIG. 5 Fig. 15 is a diagrammatically enlarged perspective view illustrating the curtain guide member 3g used in the application step.
  • the width of the color curtain tc41 discharged from the fourth curtain head 24 (see FIG. 1 ) be great.
  • the color t3 discharged from the third curtain head 23 is discharged with the width of the nozzle 23n set to a width bt3 which is narrower than the width bt4 of the color curtain tc42 of the color t4 and the width bw of the web w.
  • the color t2 discharged from the second curtain head 22 is delivered with the width of the nozzle 22n set to a width bt2 which is narrower than the width bt3 of the color curtain tc32 of the color t3.
  • the first curtain head 21 discharged color t1 having a width bt1 which is narrower than the width bt2 of the color curtain tc22 of the color t2.
  • the width bt2 of the color t2 on each side is set 10 mm narrower than the width bt3 of the color t3, and the width bt1 of the color t1 is set 10 mm narrower on each side than the width bt2 of the color t2 ,
  • the color layers of the color layers flowing along the slope 3s of the guide surface 3, discharged from the downstream side curtain heads, are wider than the color layers discharged from the adjacent upstream side curtain heads and cover the two side edges of the color layers.
  • the side edge end portions of the color layers do not overlap and, moreover, are controlled by adjacent colors of the upper layer discharged from downstream side curtain heads, the color layers are stable. As a result, a normal coating of the web w can be achieved.
  • FIG. 6 a is a schematic perspective view in the direction of arrow D in FIG. 1 a modified example for recovering the excess of the color used in the order is.
  • This example shows the dispensing of colors t3 and t4 using only a third curtain head 23 and a fourth curtain head 24.
  • FIG. 6 b a cross section along the line EE of FIG. 6 a, it is shown that in the application area the color t3 emitted from the third curtain head 23 forms a color curtain tc3 which flows downwards along the guide surface t3.
  • the color t4 discharged from the fourth curtain head 24 forms a color curtain tc4 flowing down along the guide surface 3, thereby forming a laminate film which flows along the inclination 3s of the guide surface 3.
  • the layered colors t3, t4 flow down from a curtain guide member 3g passing through the end portion of the slope 3s of the guide surface 3, fall on the surface of the web w, and coat it.
  • the excess color t3 from the third curtain head 23 can be recovered independently only by the color shells cp3, cp3.
  • the excess color t4 from the fourth curtain head 24 can be independently recovered by the color shells cp4, cp4 without mixing.
  • the excess color t3 from the third curtain head 23 can be recovered independently only by the color shells cp3, cp3.
  • the excess color t4 from the fourth curtain head 24 can be independently recovered without mixing by the color shells cp4, cp4.
  • a beam guiding part 3 f arranged in the vicinity of a nozzle 21 n of the first curtain head 21 is arranged.
  • the beam guiding part 3f is formed in the form of a block in which a middle color guide part 3fb of the width of the color t1 is used for guiding the paint t1h for the application.
  • recovery guide parts 3k for guiding the ink t1 to be recovered are present. The recovery guide parts 3k are separated and provided in different directions.
  • the application used color t1 As in FIG. 8 a , which is a cross section along the line BB of FIG. 7 is at its flow along the color guide part 3fb with the prescribed application width of the coating, that is, with the width of the color guide part 3fb out.
  • FIG. 8 c which is a cross section along the line CC of FIG FIG. 7 That is, the excess paint t1, which is not used for the coating, is guided in its flow along the recovery guide parts 3k to be caught and recovered by the paint cups cp.
  • the adjustment and positioning of the width of the ink to be applied t1 can be performed reliably and easily.
  • the excess color t1 can be recovered and used effectively.
  • FIG. 9 shows a second flow diverting apparatus B2 as a modified example of the first diverting apparatus B1.
  • a pair of (flow deflecting) guide members g1, g2 in a wedge shape gradually increasing toward the downstream side are provided in a beam guiding part 23f.
  • the beam guiding part 23 f is disposed in the vicinity of the nozzle 21 n of the first curtain head 21.
  • the width dimension gs between the guide members g1, g2 is set to the width dimension of the paint used for coating t1.
  • the ink t1 flows along the beam guiding part 23f. It is caused by the flow deflection guide members g1, g2 that the paint flows between them and is flow-deflected to a color t10.
  • the color t10 is meant for coating the the same width as the width dimension gs between the Flußumlenkungs exitsgliedern g1, g2 and the excess colors t11, t11, which flow along the outside of the Flußumlenkungs exitsglieder g1, g2 are used.
  • color recovery can be achieved by recovering the excessive colors t11, and the color t1 can be effectively utilized.
  • the color t1 applied as a first layer is first discharged from a nozzle 21n of a first curtain head 21 onto a beam guiding part 3f.
  • FIG. 7 shown first Flußumlenkungsvortechnisch B1 or in FIG. 9 shown flow deflection device B2, the width of the color used for the coating t1 to a prescribed width.
  • the excess paint t1 is flow-deflected so that it can be caught and recovered by paint shells cp.
  • the color t2 applied as the second layer becomes as in FIGS FIGS. 1 and 2 B shown, discharged from the nozzle 22n of the second curtain head 22 in a width bt2, which is greater than the width bt1 of the first layer of the color t1 (see FIG. 4 b) , for example, on each side by 10 mm wider than the width bt1 of the color t1, and will, as in the FIGS. 1 and 3 b shown applied to the first layer of color t1 flowing along the inclination 3s of the guide surface 3.
  • the color t3 applied as the third layer becomes, as in FIGS FIGS. 1 . 2 B and 4 b from the nozzle 23n of the third curtain head 23 having a width bt3 greater than the width bt2 of the second layer of color t2 (see FIG. 4 b) , for example, is wider on each side by 10 mm than the width bt2 of the ink applied to the second layer of the ink color t2, which flows along the inclination 3s of the guide surface 3.
  • the color t4 applied as the fourth layer becomes, as in FIGS FIGS. 1 . 2 B and 5 is discharged from the nozzle 24n of the fourth curtain head 24 having a width greater than the width bt3 of the third layer of the ink t3, and becomes, as in FIG. 4 b shown to form a width bt4 after contraction on the third layer of color t3, which flows along the inclination 3s of the guide surface 3.
  • the positional relationship between the tip end portion of the curtain head 22 and the first layer of the paint t1 flowing along the guide surface is set so that according to the liquid state of the colors t1, t2 by movement of the second curtain head 22 and the guide surface 3 etc. optimal conditions are created.
  • the third curtain head 23 and the fourth curtain head 24 can also be adjusted to provide optimum conditions by movement of the curtain head and the guide surface 3.
  • the colors t1, t2, t3, t4 flow along the inclination 3s of the guide surface 3, where they form four layers.
  • a color curtain tc is formed by gravity, which is applied to the surface of the web w, whereby one of 4 layers of colors t1, t2, t3, t4 existing Coating on the surface of the web w is achieved.
  • Multilayer application on a surface of a web w can be accomplished using an arbitrary number of colors in this manner.
  • a beam guiding part 3f is provided only for the first layer of color t1
  • beam guiding parts may be arbitrarily arranged in any number of curtain heads., According to the liquid state of low-flow-rate colors, etc.
  • a web w on which several layers of the colors t1, t2, t3, t4 are applied, is used after one Drying step to form a paper product. At those locations where normal coating has not occurred, such as by staining occurring in its two lateral parts, these sites can be removed by cutting.
  • the supply and the stopping of ink to arbitrary curtain heads is possible, whereupon the color of a stopped curtain head falling into a paint cup can be made by using a pipe or a pump the like (not shown in the drawing), which serves as a circulating means, can be circulated.
  • the curtain heads 21, 22, 23, 24 can be switched during the implementation of the coating, whereupon the paint for the curtain heads not used in the application is collected by paint trays and circulated by a circulating means in the standby state, and moreover instead of color water from a special water pump or special water pipe forming a supply means (not shown in the drawing) flows to these curtain heads to clean them.
  • FIG. 12 exemplifies a schematic view of a coating implemented on the basis of any selection of the colors t2, t3, t4 using the curtain heads 22, 23, 24.
  • FIG. 10 a shows a lamination of the area of the web w which is coated in sequence by the color t2 from the second curtain head 22, the color t3 from the third curtain head 23 and the color t4 from the fourth curtain head 24.
  • the colors t2, t3, t4 are not caught and recirculated by the color cups (collection containers) cp21, cp31, cp41.
  • FIG. 10 b shows a lamination of the area of the web w which is coated in sequence by the color t2 from the second curtain head 22 and the color t4 from the fourth curtain head 24.
  • the third curtain head 23 has been moved to the standby position, and the color t3 from the third curtain head 23 is caught and circulated by the paint cup cp31, whereupon instead of the ink t3, water is circulated to clean it.
  • FIG. 10 c shows a case where one surface of the web w is laminated in order by the color t3 from the third curtain head 23 and the color t4 from the fourth curtain head 24.
  • the second curtain head 22 has been moved to the standby position, and the color t2 from the second curtain head 22 is caught and circulated by the paint cup cp21, whereupon instead of the ink t2, water is circulated to clean it.
  • FIG. 10 Fig. d shows the case where a surface of the web w is laminated in order by the color t2 from the second curtain head 22 and the color t3 from the third curtain head 23.
  • the fourth curtain head 24 has been moved to the standby position, and the ink t4 from the fourth curtain head 24 is collected and circulated by the ink cup cp41, and water is circulated to purify it instead of the ink t4.
  • the first layer of color t1 is stable because it flows along the inclination 3s through the beam guiding part 3f without forming a curtain.
  • the total film thickness of the color curtain tc falling down on the web surface 2 is made thicker and thus more stable. As a result, application at a low flow rate is possible and a color saving can be achieved.
  • the optimal spacing of the guide surface 3 from the article to be coated can also be set arbitrarily.
  • the application width of the color layers can moreover be adjusted in several layers on the inclination 3s of the guide surface 3 before they are formed. This width adjustment of the paint layers to be applied to the web w is easy. As a result, the job operation is easy.
  • the ink can be supplied and stopped to arbitrary curtain heads, and the curtain heads 21, 22, 23, and 24 can be switched during the coating, whereupon the color of the curtain heads not used in the application Color cups can be collected and circulated while waiting.
  • a circulation of water is possible for their purification.
  • the ink layer on the downstream side is wider than the ink layer on the upstream side.
  • the width of the downstream side may also be less than the width of the color layer on the upstream side, or the widths of all color layers may be the same.
  • an applicator for the curtain coating method for performing a multi-layer coating using a plurality of spreads or inks having improved freedom of choice of the individual layers can be provided.
  • the invention can be applied to applicators in the production of calendars, catalogs, pressure-sensitive paper, heat-sensitive paper, photographic film, or even for Applying on a magnetic material, such as on one side of automatic platform barrier cards.
EP06707828A 2005-03-14 2006-01-25 Auftragsvorrichtung Not-in-force EP1861207B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2005071218A JP4746894B2 (ja) 2005-03-14 2005-03-14 塗工装置
PCT/EP2006/050424 WO2006097376A1 (de) 2005-03-14 2006-01-25 Auftragsvorrichtung

Publications (2)

Publication Number Publication Date
EP1861207A1 EP1861207A1 (de) 2007-12-05
EP1861207B1 true EP1861207B1 (de) 2010-06-30

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP06707828A Not-in-force EP1861207B1 (de) 2005-03-14 2006-01-25 Auftragsvorrichtung

Country Status (7)

Country Link
US (1) US20080029024A1 (ja)
EP (1) EP1861207B1 (ja)
JP (1) JP4746894B2 (ja)
CN (1) CN101142032B (ja)
AT (1) ATE472377T1 (ja)
DE (1) DE502006007326D1 (ja)
WO (1) WO2006097376A1 (ja)

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DE502006007326D1 (de) 2010-08-12
CN101142032A (zh) 2008-03-12
US20080029024A1 (en) 2008-02-07
JP4746894B2 (ja) 2011-08-10
WO2006097376A1 (de) 2006-09-21
ATE472377T1 (de) 2010-07-15
JP2006247611A (ja) 2006-09-21
EP1861207A1 (de) 2007-12-05

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