EP2082811A2 - Dispositif d'application à rideaux à couches multiples - Google Patents

Dispositif d'application à rideaux à couches multiples Download PDF

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Publication number
EP2082811A2
EP2082811A2 EP09150999A EP09150999A EP2082811A2 EP 2082811 A2 EP2082811 A2 EP 2082811A2 EP 09150999 A EP09150999 A EP 09150999A EP 09150999 A EP09150999 A EP 09150999A EP 2082811 A2 EP2082811 A2 EP 2082811A2
Authority
EP
European Patent Office
Prior art keywords
web
box
blow
chamber
air
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Withdrawn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
EP09150999A
Other languages
German (de)
English (en)
Other versions
EP2082811A3 (fr
Inventor
Akio Hirano
Hiroyuki Kohno
Tadashi Sasa
Toshihiro Katano
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 EP2082811A2 publication Critical patent/EP2082811A2/fr
Publication of EP2082811A3 publication Critical patent/EP2082811A3/fr
Withdrawn legal-status Critical Current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
    • B05C5/005—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
    • 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
    • B05C5/0245—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 for applying liquid or other fluent material to a moving work of indefinite length, e.g. to a moving web
    • 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
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H23/00—Processes or apparatus for adding material to the pulp or to the paper
    • D21H23/02—Processes or apparatus for adding material to the pulp or to the paper characterised by the manner in which substances are added
    • D21H23/22—Addition to the formed paper
    • D21H23/46—Pouring or allowing the fluid to flow in a continuous stream on to the surface, the entire stream being carried away by the paper
    • D21H23/48—Curtain coaters

Definitions

  • the present invention relates to a multiple curtain coating device for applying a first coating layer and a second application layer liquid or pasty coating medium on a moving in the web direction fibrous web, comprising at least two successively arranged curtain applicator heads, each of which the respective application medium as substantially gravity-related moving curtain emits to the fibrous web, wherein on the transport path of the fibrous web before the first gun an air boundary layer fighting device is arranged.
  • Printing paper for example for catalogs and coated paper, which i.a. for pressure-sensitive paper or thermal paper is prepared by applying a coating to the surface of the web with a coater and then drying it.
  • These coating machines, with which the coating takes place, are called commissioned works.
  • conventional applicators operate with squeegee elements, e.g. a small round bar, or air knives, with which a re-dosing of the previously applied in excess medium occurs.
  • squeegee elements e.g. a small round bar, or air knives
  • curtain coating applicators have been used because, in contrast to the conventional Nachdosiermethoden have no wearing parts such as doctor elements and also have the advantage that the maintenance is simple, that they need no surplus of order, simply and with work with high accuracy and that the operability and high quality, for example, for a top coat (contour coat) is high.
  • a curtain coater which provides an air boundary layer fighting device to combat with the high-speed rail with registered air boundary layer.
  • This control device is arranged in the running direction of the fibrous web in front of the curtain applicator.
  • This air boundary layer control or attenuation device comprises a blowing device and a suction device, wherein the blowing device is arranged in the running direction of the fibrous web in front of the commissioned work and generates a directed against the direction of airflow and wherein the suction device is arranged in the running direction of the fibrous web in front of the blowing device and at least Aspirates a portion of the air stream discharged from the blowing device and at least a portion of the entrained by the fibrous web air boundary layer.
  • the above-described air boundary layer control apparatus is easily applicable to ordinary curtain coaters using a head for discharging a single coating medium for only a single coating layer. However, if it is used for multiple curtain coater using two or three and more heads and applying two or three and more coats simultaneously, it is possible to use it for the upstream head it is not easy to use, but if the surface of the web which has been coated with the upstream head is further coated with the downstream head, it is not possible to eliminate the entrained entrained air therebetween.
  • a multi-coating device is known.
  • an air boundary layer fighting device is arranged between the two dispensing nozzles, which belong to a single gun.
  • a blocking plate is arranged between the two dispensing nozzles, which belong to a single gun.
  • the distance of the blocking plate to the surface of the web is about 5 to 10mm. This also makes it possible that flowing air boundary layers build again.
  • the object of the invention is therefore to provide a multiple curtain coater in which the disadvantages of the prior art do not occur.
  • the object is achieved in that a further Gutgrenz Anlagenbelampfungs till is provided, which is arranged between an upstream application head and a downstream application head.
  • the air entrained with the high-speed web can be reliably removed.
  • the entrained air does not adversely affect the first applied coating layer.
  • the next curtain remains undamaged on the surface of the web.
  • the additional air boundary layer fighting means consists of a cylindrical blowing chamber which is easy to manufacture. This blow chamber with a circular outer circumference is connected to a compressed air supply.
  • the additional air boundary layer fighting device also consists of a box-shaped blow box, which connects in the downstream direction of the blow chamber and also from a suction box, which is arranged in the upstream direction immediately in front of the puffer chamber.
  • the blow chamber, the blow box and the suction box extend as well as the guns with the delivered curtains in the transverse direction or direction machine width (ie perpendicular to the machine longitudinal direction).
  • the blast chamber and the blow box are advantageously connected to one another via passage openings.
  • the blow box is also divided into an upper box and a lower box.
  • Upper and lower boxes are separated from each other by means of a dividing wall, wherein passage openings for the blowing air coming from the blow chamber are likewise located in this dividing wall.
  • the lower box has a bottom whose free end with the adjacent blow chamber, ie between the said bottom and the outer periphery of the blow chamber is a Beerabsperrdüse. From this Heilabsperrdüse the blown air passes as counter air down towards the web surface and substantially opposite to the web running direction.
  • the Heilabsperrdüse can be configured very advantageous by the cylindrical blowing chamber has a bevel on its outer periphery. This is a relatively long Heilabsperrdüse which exists between this beveled, flat surface and the bottom of the lower Blasbox and acts as described above.
  • a downstream guide plate which is still below the bottom of the lower Blasbox attached to the lower part of the blow box.
  • This guide plate extends in the downward direction of movement of the web and also forms only a very narrow gap to the top of the coated web.
  • This gap between the downstream guide plate and the top of the web is between 0 and 5 mm, the lower value should be slightly greater than 0 (near 0), so that the web or the preceding application layer is not damaged by tying the guide plate.
  • the said gap between the downstream guide plate and web is a quiet area in which the wind - ie air speed is zero.
  • the pressure in the flow, so on the inlet or upstream side is lower than in the wake, ie less than at the drain or downstream side, so that no new entrained air is formed and the fluctuation of the curtain layer on the downstream gun not occurs.
  • downstream end of the downstream guide plate is brought as close as possible to the subsequent curtain, with a distance of 20 to 40 mm is provided.
  • the invention is further expediently formed by the suction box belonging to the additional air boundary layer removal device located at the upstream Side- arranged starting from the cylindrical Blashunt- and box-shaped, an upper and a lower suction box consists. Both suction boxes are spatially separated from each other by a partition wall with passage openings.
  • the upper suction box is connected to an exhaust device.
  • a guide plate is mounted similar to the blow box, which is upstream of the blow chamber. This guide plate also has a gap to the surface of the coated web, which is larger than the gap of the Blasbox guide plate, namely about 10mm wide.
  • an air intake opening is formed in a very simple manner, which sucks the flowing air boundary layers and transported up through the individual suction boxes or chambers and then emits to the outside, where they can not be disturbed.
  • the entrained air is not sufficiently sucked off, a part reverses and possibly influences the curtain layer of the upstream head, so that the above 10 mm are desirable.
  • the o.e. Air intake sucks the entrained air and the counter air, and the sucked air flows from the upper portion of the lower suction box in the upper suction box and is discharged to the outside.
  • the lower part of the suction box opens from the o.e. Air intake opening towards the top.
  • the upper suction box is divided into an upper chamber and a lower chamber. Both chambers are also separated from each other by a partition which has passage openings for the sucked in and to be removed air.
  • the fibrous web is guided over two spaced-apart support rollers, wherein the application heads are arranged in the free train of the fibrous web. This is with regard to an approximately planned overboard order, ie where the application medium or at least one curtain is to be applied wider than the web. Because there are no support elements in the order area (which may also be support bands) are present, the risk of contamination is lower.
  • a support roller is assigned to the same side of the web, which is also assigned to the support rollers present before and after the application area.
  • the support roller which has a small diameter, supports the high-speed fibrous web in the region of the additional air boundary layer removal device, ie on the underside. Likewise, adhesion of the web is prevented.
  • the entrained with the fast-running web air is reliably removed or sucked.
  • the counter air generated by the blow box is also controlled by the Coand Effect largely led along the outer surface of the blow chamber and then absorbed in the suction box, so that there is no strong blowing towards the surface of the web.
  • the angle of the counter air blown from the air shut-off nozzle to the surface of the web is between 3 and 20 degrees and the pressure in the blow box is at a transport speed of the web of about 1000 m / min at 200 mmAq, and at a transport speed the web of 1500 m / min between 250 and 300 mmAq.
  • FIG. 1 an air boundary layer control device 1 is shown, which will be discussed in more detail later. It can be seen a fibrous web w, which comes from below via a first support roller d and is deflected there in the horizontal direction. From the support roller d, the fibrous web w runs horizontally in accordance with the web running direction L as far as a further support roller k, from which the fibrous web passes to further treatment stations, not shown.
  • FIG. 1 a first air boundary layer removal device A is shown. This device A is located above the first support roller d and removes or fights with the high-speed fibrous web w (web speed about 1500m / min) entrained air boundary layer f.
  • an upstream application head 10a Assigned above the fibrous web w and the horizontal web section is an upstream application head 10a followed by a downstream applicator head 10b.
  • a support roller 11 is arranged which supports the web w, which moves at high speed, from below in the region of an air boundary layer control device 1 additionally arranged above the web w. This prevents the adherence of the web w.
  • FIG. 1 In the FIG. 1 is also a catch tray 12 installed behind each gun. These trays receive the curtain layer c during startup of the curtain coater, until the curtain layer c flowing from the applicator heads 10a, 10b is stable.
  • the web w is replaced by the upstream application head 10a with the first, i. coated lower layer 20.
  • the entrained air f newly built up after the first application is removed.
  • the web w is coated with the next layer 30 by the downstream application head 10b.
  • this layer 30 deposits on the lower layer 20 without intermediate drying. It is thus formed a double layer.
  • the web w is guided over the guide roller k and arrives at a drying device, not shown, or, as already mentioned, to further treatment devices, for example further coating devices or smoothing devices.
  • FIG. 2 is the in FIG. 1 illustrated with marked air boundary layer fighting device 1.
  • This air boundary layer fighting device 1 consists of a preferably cylindrical blast chamber 2, which is connected to a compressed air supply 13 and extends horizontally in the machine width direction, ie in the transverse direction QD.
  • the transverse direction is perpendicular to the machine longitudinal direction MD.
  • machine By the term “machine” is meant by the way a pulp manufacturing and / or finishing machine. In this machine either a coating machine containing the curtain applicator is integrated online or offline.
  • the above-mentioned air boundary layer fighting device 1 is very compact and also consists of a Blasbox 3. It is seen in the running direction of the fibrous web w, the blowing chamber 2 immediately downstream, so arranged on the downstream side.
  • a series of passage openings 7a are incorporated, so that a passage of blowing air from the blow chamber 2 passes into the blow box.
  • the blow box 3 is divided into a top box 3a and a bottom box 3b by a partition wall 3d, and is formed in the form of an "E" when viewed from the side.
  • the partition wall 3d also has passage openings, which are designated by 7b.
  • through openings 7a and 7b are used in the direction of the machine width round holes or slots. For example, punched metal can be used. This also applies to other passage openings, which will be described later.
  • the lower Blasbox 3b has a bottom 3c, which is directed obliquely downward in the direction of the blow chamber 2.
  • the free end of this slope of the bottom 3c forms with a flattened, flat surface 2a on the outer periphery of the blowing chamber 2, which face each other, a Beerabsperrdüse 8.
  • This Beerabsperrdüse 8 blows down and opposite to the web running direction counter air m.
  • the counter air m is through the known Coand Effect largely led along the outer surface of the blow chamber 2 and then absorbed in a suction box 4 to be described later, so that there is no strong blowing toward the surface of the web w.
  • this counter-air m is absorbed by a suction box 4 and then discharged to the outside, where the air can no longer disturb the coating process.
  • the outer surface of the blow box 3 extends over a flat surface 3e at the upper part and over a bevel 3f directed downwards in the direction of movement of the web w.
  • a short vertical surface is present.
  • a downstream guide plate 9 is attached between the lower end of the slope 3f and the lower end of the bottom 3c of the inner part of the blow box.
  • a narrow gap s1 of 0 to 5 mm is formed between the downstream guide plate 9 and the web w. It is desirable to bring the end of the downstream guide plate 9 as close as possible to the subsequent curtain cb delivered by the curtain head 10b, with a distance a1 of 20 to 40 mm being advantageous.
  • the specification of the lower limit value with 0 for the narrow gap s1 invariably means close, that is slightly greater than zero.
  • a1 0, there is a contact of the guide plate 9 with the fibrous web w, which is rather undesirable.
  • the air boundary layer fighting device 1 also has the above-mentioned suction box 4, which is the blow chamber 2 upstream or disposed on the upstream side.
  • the suction box 4 is an approximately square box and also extends like the blow chamber 2, the blow box 3 and the applicator heads 10a, 10b and trays 12 and the air boundary layer removal device A across the machine width, ie in the transverse direction QD.
  • the suction box 4 consists of an upper suction box 4a and a lower suction box 4b.
  • the upper suction box 4 a is connected to an exhaust device 14. Both suction boxes 4a and 4b are separated from each other by means of a partition 4f.
  • the partition contains as well as the partitions of the Blasbox 3 through openings 7c, which ensure the passage of the sucked air here.
  • the upper suction box 4a is divided by a horizontal partition 4e into an upper chamber 4c and a lower chamber 4d.
  • the partition wall 4e again has passage openings, which are designated by 7d.
  • the upper chamber 4 c is connected to the exhaust device 14.
  • upstream guide plate 5 At the lower part of the lower suction box 4b of the blowing chamber upstream guide plate 5 is attached.
  • This guide plate 9 has a gap s2 to the surface of the coated web w.
  • the end guide plate 5 connects to an upwardly directed slope 4g. Its upper end in turn follows a vertical surface 4h. Between the free end of the upstream guide plate 5 and the outer surface of the blow chamber 2, a narrow air intake opening 6 is formed.
  • Said gap s2 between the upstream guide plate 5 and the surface of the web w is about 10 mm. If this gap were narrower, the entrained air f would not be sufficiently extracted. One part would reverse and possibly negatively affect the first curtain layer ca in its fall path.
  • the air intake opening 6 sucks the entrained air f and also the counter air m, whereby the sucked air flows through the passage openings of the suction box 4b in the upper suction box 4a and is discharged to the outside.
  • the lower part of the suction box 4b opens from the. Air intake 6 upwards.
  • the passage openings 7a to 7d present in the blow box and in the suction box are adjustable in their size or flow rate in the manner of a blind.
  • the present invention is not limited only to design of embodiments as described above, but also various changes are possible within a framework in which the main contents of the invention are not violated.
  • two or more may also be added.
  • the Blashunt 2 is cylindrical, but it may also be rectangular and only at the lower end have a round bottom.

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  • Coating Apparatus (AREA)
  • Paper (AREA)
EP09150999A 2008-01-22 2009-01-21 Dispositif d'application à rideaux à couches multiples Withdrawn EP2082811A3 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2008011583A JP5239011B2 (ja) 2008-01-22 2008-01-22 タンデム型カーテンコータのエアーカット装置

Publications (2)

Publication Number Publication Date
EP2082811A2 true EP2082811A2 (fr) 2009-07-29
EP2082811A3 EP2082811A3 (fr) 2012-05-30

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP09150999A Withdrawn EP2082811A3 (fr) 2008-01-22 2009-01-21 Dispositif d'application à rideaux à couches multiples

Country Status (2)

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EP (1) EP2082811A3 (fr)
JP (1) JP5239011B2 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009172470A (ja) * 2008-01-22 2009-08-06 Voith Patent Gmbh タンデム型カーテンコータのエアーカット装置
DE102010001616A1 (de) * 2010-02-05 2011-08-11 Voith Patent GmbH, 89522 Auftragsvorrichtung
WO2022133762A1 (fr) * 2020-12-23 2022-06-30 苏州沃蓝纺织科技有限公司 Dispositif de production de tissu revêtu présentant une épaisseur de revêtement uniforme

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1208917A2 (fr) 2000-11-22 2002-05-29 Voith Paper Patent GmbH Dispositif de revêtement par rideau
DE10125376A1 (de) 2000-03-14 2002-11-28 Voith Paper Patent Gmbh Auftragsvorrichtung
EP1538262A1 (fr) 2003-12-01 2005-06-08 Voith Paper Patent GmbH Installation de revetment double face

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63252575A (ja) * 1987-04-08 1988-10-19 Mitsubishi Paper Mills Ltd 塗布装置および塗布方法
JPH07246356A (ja) * 1994-03-09 1995-09-26 Mitsubishi Heavy Ind Ltd 被膜形成装置
JP4089007B2 (ja) * 1998-04-22 2008-05-21 株式会社Ｉｈｉ コーター装置
JP3625254B2 (ja) * 1998-12-11 2005-03-02 三菱製紙株式会社 塗布装置
JP4403632B2 (ja) * 2000-04-27 2010-01-27 株式会社Ｉｈｉ カーテンコータのエアーカット装置
DE102004062120A1 (de) * 2004-12-23 2006-07-13 Voith Paper Patent Gmbh Verfahren und Vorrichtung zum Behandeln einer laufenden Papier-, Karton- oder anderen Faserstoffbahn
JP5239011B2 (ja) * 2008-01-22 2013-07-17 ボイス パテント ゲーエムベーハー タンデム型カーテンコータのエアーカット装置

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10125376A1 (de) 2000-03-14 2002-11-28 Voith Paper Patent Gmbh Auftragsvorrichtung
EP1208917A2 (fr) 2000-11-22 2002-05-29 Voith Paper Patent GmbH Dispositif de revêtement par rideau
EP1538262A1 (fr) 2003-12-01 2005-06-08 Voith Paper Patent GmbH Installation de revetment double face

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009172470A (ja) * 2008-01-22 2009-08-06 Voith Patent Gmbh タンデム型カーテンコータのエアーカット装置
DE102010001616A1 (de) * 2010-02-05 2011-08-11 Voith Patent GmbH, 89522 Auftragsvorrichtung
WO2022133762A1 (fr) * 2020-12-23 2022-06-30 苏州沃蓝纺织科技有限公司 Dispositif de production de tissu revêtu présentant une épaisseur de revêtement uniforme

Also Published As

Publication number Publication date
JP2009172470A (ja) 2009-08-06
EP2082811A3 (fr) 2012-05-30
JP5239011B2 (ja) 2013-07-17

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