JP2007125464A - Coating apparatus and coating method - Google Patents

Coating apparatus and coating method Download PDF

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JP2007125464A
JP2007125464A JP2005318582A JP2005318582A JP2007125464A JP 2007125464 A JP2007125464 A JP 2007125464A JP 2005318582 A JP2005318582 A JP 2005318582A JP 2005318582 A JP2005318582 A JP 2005318582A JP 2007125464 A JP2007125464 A JP 2007125464A
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curtain
web
paint
width
coating
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JP4902984B2 (en
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Takeo Nakazawa
武雄 中澤
Tadashi Sasa
忠 佐々
Toshio Hirano
利夫 平野
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Voith Patent GmbH
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Voith Paper Patent GmbH
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Priority to JP2005318582A priority Critical patent/JP4902984B2/en
Priority to DE502006004846T priority patent/DE502006004846D1/en
Priority to AT06122981T priority patent/ATE442913T1/en
Priority to EP06122981A priority patent/EP1782891B1/en
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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
    • B05C5/005—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

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  • Coating Apparatus (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Paper (AREA)
  • Registering, Tensioning, Guiding Webs, And Rollers Therefor (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To provide a two-layer curtain coating apparatus adaptable to the meandering of a web w. <P>SOLUTION: The coating apparatus is provided with: two curtain heads 1a, 1b from each of which a coating material is jetted downward; and a guide sheet 2 on which two coating material layers are formed by successively layering the coating material to be jetted from each of two curtain heads 1a, 1b and from the curtain guide part 2b of which two coating material layers are transferred onto the surface of the web w as coating material curtains ca, cb. The curtain heads 1a, 1b are allowed to be shifted to the width direction of the web. The width of the coating material to be jetted from the curtain head 1a is made wider than the width of the web w and that of the coating material to be jetted from the curtain head 1b is made narrower than the width of the web. A meandering detection sensor 6 is arranged for detecting the meandering of the web. The positions of the curtain heads 1a, 1b in the width direction of the web are controlled respectively to be adjusted to the meandering of the web w according to a signal from the meandering detection sensor 6. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

本発明は、塗工装置および塗工方法に係り、特に２層のカーテン塗工を行う塗工装置および塗工方法に関するものである。     The present invention relates to a coating apparatus and a coating method, and more particularly to a coating apparatus and a coating method for performing two-layer curtain coating.

カタログなどに用いられる印刷用紙、感圧紙、感熱紙などの塗工紙はコータによって原紙であるウェブ（基材）上に塗料を塗布後、乾燥して生産される。このように塗料の塗布を行う機械を塗工機と称している。従来このような塗工機は、ウェブ上に過剰な塗料を一度塗った後に、ブレードや小径のロッドなどで掻き落したり、エアナイフによって吹き飛ばしたりして計量（メータリング）するポストメータリング方式を採用したブレードコータ、ロッドコータ、エアナイフコータなどが主流であった。しかしこのようなポストメータリング方式による塗工では、塗料をウェブに塗布するときの液圧やブレードなどの押付力などにより、塗料がウェブに多く浸透することや、ブレードやロッドなどの磨耗によるメンテナンス費用が高いということなどの問題がある。
そこで近年、走行するウェブ上にカーテンヘッド（塗料のカーテン膜を作るノズル付チャンバー）から塗料のカーテン膜を噴出しウェブ上に塗工するカーテンコータが広く採用されるようになってきた。カーテンコータは写真の印画紙などの分野では古くから用いられてきたが、高速時の空気の巻き込み、塗料に混入した泡、機械的精度不足による塗料カーテン膜の不安定さ等により塗工が安定しなかったため製紙業界では利用されていなかった。
本願出願人はこれらの問題を解決しカーテン塗工技術を安定技術として開発し、既に多数のカーテン塗工機を全世界に供給している。カーテン塗工機は従来のポストメータリング方式の塗工機と異なり、ブレードやロッドなどの消耗品が無いのでメンテナンスが楽である、塗工量を容易に精度高く調節できる、操作性がよい、輪郭塗工（Contour Coat）のため表面性改善の効果が高い、などの特長がある。
このようなカーテン塗工技術を用いて２層以上の塗料をウェブ上に塗工することが求められることがある。図４はかかる２層式カーテンコータの要部断面図である。図に示すように、矢印方向に搬送されるウェブｗに対して、上方のカーテンヘッドａ、ｂから塗料ｔａ、ｔｂを噴出し塗料カーテンｃａ、ｃｂを形成し、ウェブｗ面上に２層の塗工層ｓａ、ｓｂを形成する。
ところでこのようなカーテン式の塗工装置においては、ウェブｗの搬送される速度が低速（たとえば、１２０ｍ／ｍｉｎ）である写真のフィルムなどの場合には、塗料カーテンｃａ、ｃｂの落下速度とフィルムの搬送速度に大差が無いため、塗工層ｓａはフィルム面上に第１層として正常に形成され、塗工層ｓｂは第１層の塗工層ｓａ面上に第２層として正常に形成される。
しかしながら、このカーテン式の塗工装置を、紙材であるウェブｗに適用した場合には、ウェブｗの搬送速度が、３００〜１８００ｍ／ｍｉｎと高速であり、塗料カーテンｃａ、ｃｂの落下速度は１８０ｍ／ｍｉｎ程度であるため大きな速度差がある。この場合、塗料カーテンｃａはウェブｗ面上にウエット オン ドライ状態で到達するので、その間の摩擦係数が十分大きく、ウェブｗ面上に一様に引き伸ばされ、ムラのない一様な塗工層ｓａが第１層として正常に形成される。一方、塗料カーテンｃｂは第１層の塗工層ｓａ面上にウエット オン ウエット状態で到達するので、その間の摩擦係数が小さく、すべりが発生し、第１層の塗工層ｓａ面上でうまく引き伸ばされずにムラを生じ、第２層の塗工層ｓｂは正常に形成されない場合がある。
２層以上の塗料をウェブ上に塗工する他の方法が知られている。図５は特許文献１に開示された２層式の塗工装置の断面図である。図に示すように、２層式のカーテンヘッドｃから塗料ｔａ、ｔｂを噴出し、重なり合った２層の塗料カーテンｃａ、ｃｂを形成し、図４と同様に走行するウェブｗ面上に２層の塗工層ｓａ、ｓｂを形成する。この場合に２層の塗料カーテンｃａ、ｃｂはウェブｗ面上にウエット オン ドライ状態で到達するので、その間の摩擦係数が十分大きく、ウェブｗ面上に一様に引き伸ばされ、ムラのない一様な塗工層ｓａ、ｓｂを形成する。
特許文献１によれば、２つの塗料ｔａ、ｔｂの組成が異なる場合、塗料カーテンの１つの層ｃａの幅はウェブｗの幅よりも広く、塗料カーテンの他の層ｃｂの幅はウェブｗの幅よりも狭くウェブｗを溢れ出ない幅になっている。これにより、ウェブｗの縁から溢れ出る液膜（塗料カーテン）ｃａは単一層であるため、この溢れ出る塗料ｔａを回収し、同一組成の層の液供給原料中に再循環することができる。なお、塗料カーテンは自由落下中に表面張力によって幅が縮小する。このためウェブｗへ塗工する場合、カーテンの幅がウェブの幅と同等あるいはウェブの幅より狭い場合、ウェブの表面に塗工された塗工層の厚さは幅方向端部において厚くなる傾向があり、塗工層の厚さの均一性が保てない。そのため、カーテンの幅をウェブの幅より広くして、カーテンの一部をウェブから溢れさせ塗工層の厚さの均一性を保つようにする。
以上説明した特許文献１に開示された塗工装置において、ウェブｗへの塗工中には塗料の回収にはなんら問題ない。しかし、運転開始の準備段階に問題が発生する。すなわち、一般に、塗工を始める前には、安定した塗料カーテンを形成するまで、ウェブを走行させないで、カーテンヘッドに塗料を供給し、しばらくの間塗料を噴出させておく。この間２つの塗料が混じり合うため、塗料を回収することができない。一方、図４に示す塗工装置においてはこのような問題はない。
本願出願人は上記２つの２層式カーテンコータの問題点を解決し、かつ、それぞれの長所を生かすため、鋭意研究をして新たな塗工装置を開発し、先に特許出願を行った（特願２００５−７１２１８（未公開））。
図６および図７は上記出願に開示された図面であり、図６（A）は上記塗工装置の部分側断面図、図６（Ｂ）は図６（A）のＢ矢視図である。図７（A）は上記塗工装置の操業中の部分側面図、図７（Ｂ）は運転準備中の部分側面図である。これらの図において、図４を用いて説明した２層式カーテンコータと同様の部分には同一の符号を付している。図６
（A）に示すように、上記出願発明の２層式カーテンコータは塗料ｔａ、ｔｂをそれぞれ下方に向け噴出させる２個のカーテンヘッド１ａ、１ｂと、前記２個のカーテンヘッド１ａ、１ｂからそれぞれ順次斜面２ａに向かって噴出される塗料ｔａ、ｔｂを、該斜面２ａ上を移動させるに伴い順番に積層して２層の塗料層を形成し、該斜面２ａの下端部の下向きのカーテンガイド部２ｂから該塗料層を塗料カーテンｃａ、ｃｂとしてウェブｗ面上に移行させるガイドシート２とを有している。このようにして走行するウェブｗ面上に２層の塗工層ｓａ、ｓｂを形成する。図６（Ｂ）に示すように、塗料カーテンｃａの幅はウェブｗの幅よりも狭く、塗料カーテンｃｂの幅はウェブｗの幅よりも広い。３者の幅の関係がこのようになっているので、塗料ｔａと塗料ｔｂが異なる場合にも塗料の循環が問題なく行われる。また、ガイドシート２の幅は塗料カーテンｃｂの幅よりも広い。３はウェブｗの両端から溢れた部分の塗料カーテンｃｂを受けて、循環させるカラーパンである。
このような２層式カーテンコータにおいて、塗工を始める前に安定した塗料カーテンを形成させるために、通紙しない状態でそれぞれのカーテンヘッドからしばらくの間塗料を噴出させておく。また、塗工が完了した後、カーテンヘッド内や塗料の循環系統内を洗浄するため水廻しをする。それらのやり方について図７を用いて説明する。図７（Ａ）は塗工の操業中の塗工装置の部分側面図、図７（Ｂ）は塗工を始める前に塗料を噴出させている状態、または、塗工が完了した後水廻しをしている状態を示す塗工装置の部分側面図である。なお、図７（Ａ）は図６とほぼ同じなので説明を省略する。これらの図において、４ａはカーテンヘッド１ａの塗料噴出幅よりも広い幅を有し、カーテンヘッド１ａから噴出する塗料または水の全量を回収するカラーパンである。４ｂはカーテンヘッド１ｂの塗料噴出幅よりも広い幅を有し、カーテンヘッド１ｂから噴出する塗料または水の全量を回収するカラーパンである。図７（Ｂ）に示すように、塗工を始める前または塗工が完了した後にはカーテンヘッド１ａおよびカーテンヘッド１ｂはそれぞれ矢印に示す方向に移動し、塗料カーテンｃａ、ｃｂまたは水カーテンをカラーパン４ａ、４ｂで受けるようにする。なお、この例ではカーテンヘッド１ａおよびカーテンヘッド１ｂを移動しているが、カラーパン４ａ、４ｂを移動するようにしてもよい。
特公昭６２−４７０７５号公報 Coated paper such as printing paper, pressure-sensitive paper, and thermal paper used for catalogs and the like is produced by applying a paint onto a web (base material) that is a base paper by a coater and then drying. A machine for applying a paint in this way is called a coating machine. Conventionally, such a coating machine employs a post-metering method in which excessive paint is applied once on the web, and then scraped off with a blade or small-diameter rod or blown off with an air knife. Blade coaters, rod coaters, air knife coaters, etc. were the mainstream. However, in such post-metering coating, the paint penetrates the web a lot due to the hydraulic pressure when applying the paint to the web and the pressing force of the blade, etc., and maintenance due to wear of the blade and rod, etc. There are problems such as high costs.
In recent years, therefore, curtain coaters have been widely adopted in which a curtain film of a paint is ejected from a curtain head (a chamber with a nozzle for creating a curtain film of paint) onto the traveling web and applied onto the web. Curtain coaters have been used for a long time in fields such as photographic printing paper, but coating is stable due to air entrainment at high speed, bubbles mixed in paint, instability of paint curtain film due to insufficient mechanical accuracy, etc. Was not used in the paper industry.
The present applicant has solved these problems, developed curtain coating technology as a stable technology, and has already supplied a large number of curtain coating machines to the whole world. Unlike conventional post metering type coating machines, curtain coating machines are easy to maintain because there are no consumables such as blades and rods, and the coating amount can be easily adjusted with high accuracy, and operability is good. There are features such as high effect of surface property improvement due to contour coating.
It may be required to apply two or more layers of paint on the web using such curtain coating technology. FIG. 4 is a cross-sectional view of the main part of such a two-layer curtain coater. As shown in the figure, the paints ta and tb are ejected from the upper curtain heads a and b to the web w conveyed in the direction of the arrow to form the paint curtains ca and cb, and two layers are formed on the web w surface. The coating layers sa and sb are formed.
By the way, in such a curtain type coating apparatus, when the web w is conveyed at a low speed (for example, 120 m / min), such as a photographic film, the falling speed of the paint curtains ca and cb and the film The coating layer sa is normally formed as the first layer on the film surface and the coating layer sb is normally formed as the second layer on the surface of the first coating layer sa. Is done.
However, when this curtain type coating apparatus is applied to the web w which is a paper material, the conveyance speed of the web w is as high as 300 to 1800 m / min, and the falling speed of the paint curtains ca and cb is Since it is about 180 m / min, there is a large speed difference. In this case, since the paint curtain ca reaches the web w surface in a wet-on-dry state, the friction coefficient therebetween is sufficiently large and is uniformly stretched on the web w surface, and the uniform coating layer sa without any unevenness. Is normally formed as the first layer. On the other hand, since the paint curtain cb reaches the first coating layer sa surface in a wet-on-wet state, the friction coefficient therebetween is small, slipping occurs, and the first coating layer sa surface is fine. In some cases, the second coating layer sb is not formed normally due to unevenness without being stretched.
Other methods of applying two or more layers of paint on a web are known. FIG. 5 is a cross-sectional view of a two-layer coating apparatus disclosed in Patent Document 1. As shown in the figure, paints ta and tb are ejected from a two-layer curtain head c to form two overlapping paint curtains ca and cb, and two layers are formed on the surface of the web w running as in FIG. Coating layers sa and sb are formed. In this case, since the two-layer paint curtains ca and cb reach the web w surface in a wet-on-dry state, the coefficient of friction between them is sufficiently large and is uniformly stretched on the web w surface so that there is no unevenness. Coating layers sa and sb are formed.
According to Patent Document 1, when the compositions of the two paints ta and tb are different, the width of one layer ca of the paint curtain is wider than the width of the web w, and the width of the other layer cb of the paint curtain is that of the web w. The width is narrower than the width and does not overflow the web w. Thereby, since the liquid film (paint curtain) ca overflowing from the edge of the web w is a single layer, the overflowing paint ta can be collected and recycled into the liquid feedstock of the same composition layer. Note that the width of the paint curtain is reduced by the surface tension during free fall. For this reason, when coating on the web w, if the curtain width is equal to the web width or narrower than the web width, the thickness of the coating layer coated on the web surface tends to be thick at the end in the width direction. The uniformity of the coating layer thickness cannot be maintained. Therefore, the width of the curtain is made wider than the width of the web so that a part of the curtain overflows from the web and the thickness of the coating layer is kept uniform.
In the coating apparatus disclosed in Patent Document 1 described above, there is no problem in collecting the paint during coating on the web w. However, a problem occurs in the preparation stage for starting operation. That is, generally, before starting the coating, the paint is supplied to the curtain head without spraying the web until the stable paint curtain is formed, and the paint is ejected for a while. During this time, the two paints are mixed together, so that the paint cannot be recovered. On the other hand, there is no such problem in the coating apparatus shown in FIG.
In order to solve the problems of the above two-layer curtain coaters and to take advantage of the respective advantages, the applicant of the present application has intensively developed a new coating apparatus and filed a patent application first ( Japanese Patent Application No. 2005-71218 (unpublished).
6 and 7 are drawings disclosed in the above application, FIG. 6 (A) is a partial side sectional view of the coating apparatus, and FIG. 6 (B) is a view as seen from an arrow B in FIG. 6 (A). . FIG. 7 (A) is a partial side view during operation of the coating apparatus, and FIG. 7 (B) is a partial side view during operation preparation. In these drawings, the same reference numerals are given to the same parts as those of the two-layer curtain coater described with reference to FIG. FIG.
As shown in (A), the two-layer curtain coater of the above-mentioned invention of the application is composed of two curtain heads 1a and 1b for spraying paints ta and tb downward and the two curtain heads 1a and 1b, respectively. The coatings ta and tb sequentially ejected toward the inclined surface 2a are sequentially laminated as the surface of the inclined surface 2a is moved to form two coating layers, and the downward curtain guide portion at the lower end of the inclined surface 2a. 2b, and a guide sheet 2 for transferring the paint layer onto the web w surface as paint curtains ca and cb. In this way, two coating layers sa and sb are formed on the running web w surface. As shown in FIG. 6B, the width of the paint curtain ca is narrower than the width of the web w, and the width of the paint curtain cb is wider than the width of the web w. Since the relationship between the three widths is as described above, even when the paint ta and the paint tb are different, the circulation of the paint is performed without any problem. The width of the guide sheet 2 is wider than the width of the paint curtain cb. A color pan 3 receives and circulates the paint curtain cb overflowing from both ends of the web w.
In such a two-layer curtain coater, in order to form a stable paint curtain before starting coating, paint is ejected from each curtain head for a while without passing paper. In addition, after the coating is completed, the curtain head and the paint circulation system are washed with water. These methods will be described with reference to FIG. Fig. 7 (A) is a partial side view of the coating apparatus during coating operation, and Fig. 7 (B) is a state in which paint is ejected before starting coating, or watering is performed after coating is completed. It is a partial side view of the coating apparatus which shows the state which is doing. Note that FIG. 7A is substantially the same as FIG. In these figures, 4a is a color pan having a width wider than the paint ejection width of the curtain head 1a and collecting the entire amount of paint or water ejected from the curtain head 1a. Reference numeral 4b denotes a color pan having a width wider than the paint ejection width of the curtain head 1b and collecting the entire amount of paint or water ejected from the curtain head 1b. As shown in FIG. 7B, the curtain head 1a and the curtain head 1b move in the directions indicated by the arrows before the coating is started or after the coating is completed, and the paint curtains ca, cb or the water curtain are colored. Receive with bread 4a, 4b. In this example, the curtain head 1a and the curtain head 1b are moved, but the color pans 4a and 4b may be moved.
Japanese Patent Publication No.62-47075

以上説明した先の出願の２層式カーテンコータにおいて次のような問題がある。
すなわち、紙（ウェブ）の蛇行の問題がある。アンワインダに掛けられた紙の巻き取りロールから繰り出された紙に、繰り出した直後に塗工する場合にはほとんど蛇行の問題はない。しかし、紙の巻き取りロールから繰り出された紙に塗工し、それを一旦乾燥した後に、その上に塗工し、さらに乾燥させるような場合には、塗工した面が乾く前に固体を接触させることはできないので、紙に熱風を吹き付けて浮かせた状態で走行しつつ乾燥させるエアドライヤを使用することになるが、２度目の塗工のときには、紙は３０ｍｍ程度蛇行しながら走行する場合がある。その場合紙の端部が塗工されない状態で通過してしまうことになりかねない。
本発明は先の出願の発明のかかる問題点を解決し、改良するために案出されたものであり、紙の蛇行に対応することを目的とするものである。 The two-layer curtain coater of the previous application described above has the following problems.
That is, there is a problem of meandering of paper (web). There is almost no problem of meandering when the paper taken out from the paper take-up roll hung on the unwinder is applied immediately after being fed out. However, in the case where the paper is fed out from the paper take-up roll, and once dried, then coated on the paper and further dried, the solid is applied before the coated surface dries. Since it cannot be contacted, an air dryer that dries while hot air is blown on the paper and used for drying will be used. In the second coating, the paper may run while meandering about 30 mm. is there. In that case, the end of the paper may pass without being coated.
The present invention has been devised to solve and improve such problems of the invention of the previous application, and aims to cope with meandering of paper.

上記目的を達成するため本発明の塗工装置は搬送されるウェブ面上に塗料を２層に塗布する塗工装置であって、任意の間隔をもって配設され、塗料をそれぞれ下方に向け噴出させる２個のカーテンヘッドと、前記２個のカーテンヘッドからそれぞれ順次斜面に向かって噴出される塗料を、該斜面上を移動させるに伴い順番に積層して２層の塗料層を形成し、該斜面の下端部の下向きのカーテンガイド部から該塗料層を塗料カーテンとしてウェブ面上に移行させるガイドシートと、ウェブへの塗工前にそれぞれのカーテンヘッドから噴出される全部の塗料を受けてそれぞれ別々に回収する塗料回収手段とを備えてなる塗工装置において、それぞれのカーテンヘッドはウェブの幅方向にシフト可能になっているとともに、一方のカーテンヘッドからの塗料の噴出幅はウェブの幅よりも大きくなっており、他方のカーテンヘッドからの塗料の噴出幅はウェブの幅よりも小さくなっており、ウェブの蛇行を検出する蛇行検出センサーを備え、両方のカーテンヘッドはともに蛇行検出センサーからの信号でウェブの蛇行に合わせて幅方向の位置が制御されるようになっている。
また、本発明の塗工方法は搬送されるウェブ面上に塗料を２層に塗布する塗工装置であって、任意の間隔をもって配設され、塗料をそれぞれ下方に向け噴出させる２個のカーテンヘッドと、前記２個のカーテンヘッドからそれぞれ順次斜面に向かって噴出される塗料を、該斜面上を移動させるに伴い順番に積層して２層の塗料層を形成し、該斜面の下端部の下向きのカーテンガイド部から該塗料層を塗料カーテンとしてウェブ面上に移行させるガイドシートと、ウェブへの塗工前にそれぞれのカーテンヘッドから噴出される全部の塗料を受けてそれぞれ別々に回収する塗料回収手段とを備えてなり、それぞれのカーテンヘッドはウェブの幅方向にシフト可能になっているとともに、一方のカーテンヘッドからの塗料の噴出幅はウェブの幅よりも大きくなっており、他方のカーテンヘッドからの塗料の噴出幅はウェブの幅よりも小さくなっており、ウェブの蛇行を検出する蛇行検出センサーを備えてなる塗工装置において、蛇行検出センサーからの信号でウェブの蛇行に合わせて両方のカーテンヘッドの幅方向の位置を制御する。
つぎに本発明の塗工装置および塗工方法についてその作用を説明する。（１）それぞれのカーテンヘッドはウェブの幅方向にシフト可能になっていて、蛇行検出センサーからの信号でウェブの蛇行に合わせて幅方向の位置を制御しているので、塗料カーテンとウェブの幅方向の相対的な位置は常に一定に保たれていて、紙の端部が塗工されない状態で通過してしまうようなことは起こらない。（２）２つのカーテンヘッドは別体になっており、それぞれのカーテンヘッドから噴出される全部の塗料を受けてそれぞれ別々に回収する塗料回収手段を有しているので、塗工前と塗工後の塗料の回収と水回しを問題なく行える。 In order to achieve the above object, a coating apparatus according to the present invention is a coating apparatus that coats two layers of paint on a web surface to be transported, and is disposed at an arbitrary interval to spray the paint downward. Two curtain heads and paints ejected sequentially from the two curtain heads toward the slope are sequentially laminated as the slope is moved to form two paint layers. The guide sheet for transferring the paint layer onto the web surface as a paint curtain from the downward curtain guide part of the lower end of the sheet, and all the paints ejected from each curtain head before coating on the web are received separately. In addition, each curtain head can be shifted in the width direction of the web, and one of the curtain heads The jet width of the paint is larger than the width of the web, the jet width of the paint from the other curtain head is smaller than the width of the web, and has a meander detection sensor that detects the meander of the web, both Both of the curtain heads are controlled in position in the width direction according to the meandering of the web by a signal from the meandering detection sensor.
Also, the coating method of the present invention is a coating apparatus for coating two layers of paint on the web surface to be conveyed, and is provided with two curtains that are arranged at an arbitrary interval and each sprays the paint downward. The head and the paints that are sequentially ejected from the two curtain heads toward the slope are sequentially laminated to form a two-layer paint layer as it moves on the slope. A guide sheet for transferring the paint layer as a paint curtain from the downward curtain guide portion onto the web surface, and a paint that receives all the paints ejected from the respective curtain heads before being applied to the web and collects them separately. Each curtain head is shiftable in the width direction of the web, and the jet width of the paint from one curtain head is larger than the width of the web. In the coating apparatus having a meandering detection sensor for detecting the meandering of the web, the jetting width of the paint from the other curtain head is smaller than the width of the web, and the signal from the meandering detection sensor Control the position of both curtain heads in the width direction according to the meandering of the web.
Next, the operation of the coating apparatus and the coating method of the present invention will be described. (1) Each curtain head can be shifted in the width direction of the web, and the position in the width direction is controlled in accordance with the meandering of the web by a signal from the meander detection sensor. The relative position of the direction is always kept constant, so that the end of the paper does not pass through without being coated. (2) The two curtain heads are separate bodies and have paint recovery means for receiving all the paints ejected from each curtain head and recovering them separately. It is possible to recover the paint later and water it without any problems.

以上説明したように本発明の塗工装置および塗工方法は、紙が蛇行しても問題なく塗工できる、塗工前と塗工後の塗料の回収と水回しを問題なく行えるなどの優れた効果を有する。   As described above, the coating apparatus and the coating method of the present invention can be applied without any problem even if the paper meanders, and are excellent in that the coating can be collected and watered before and after coating without any problems. It has the effect.

以下本発明の１実施形態について図面を参照しつつ説明する。図１は本発明の塗工装置の側面図、図２は同じく平面図である。図３（Ａ）は塗工の操業中の塗工装置の部分側面図、図３（Ｂ）は塗工を始める前に塗料を噴出させている状態、または、塗工が完了した後水廻しをしている状態を示す塗工装置の部分側面図である。これらの図において、従来技術の説明のために使用した図４ないし図７で示されたものと同様の部分については同一の符号を使用している。
これらの図に示すように、本発明の塗工装置は搬送されるウェブｗ面上に塗料を２層に塗布する塗工装置である。任意の間隔をもって配設され、塗料をそれぞれ下方に向け噴出させる２個のカーテンヘッド１ａ、１ｂを有している。２はガイドシートであって、前記２個のカーテンヘッド１ａ、１ｂからそれぞれ順次斜面２ａに向かって噴出される塗料を、該斜面２ａ上を移動させるに伴い順番に積層して２層の塗料層を形成し、該斜面２ａの下端部の下向きのカーテンガイド部２ｂから該塗料層を塗料カーテンｃａ、ｃｂとしてウェブｗ面上に移行させている。
塗料カーテンｃａはウェブｗよりも広い幅を有しているので図３（Ａ）に示すようにウェブｗの両端から溢れ出た部分の塗料カーテンｃａはカラーパン３によって回収する。図３（Ｂ）に示すように、ウェブｗへの塗工前には、それぞれのカーテンヘッド１ａ、１ｂから噴出される全部の塗料を受けてそれぞれ別々に回収する塗料回収手段を備えている。塗料回収手段はカーテンヘッド１ａの塗料噴出幅よりも広い幅を有し、カーテンヘッド１ａから噴出する塗料または水の全量を回収するカラーパン４ａと、カーテンヘッド１ｂの塗料噴出幅よりも広い幅を有し、カーテンヘッド１ｂから噴出する塗料または水の全量を回収するカラーパン４ｂとを有してなり、カラーパン４ａ、４ｂで回収された塗料は図示しないポンプによってそれぞれの原料供給系統に戻される。図７（Ｂ）では運転準備段階の状態から運転段階に移るときにカーテンヘッド１ａ、１ｂをそれぞれ移動するものとして説明したが、図３（Ｂ）ではガイドシート２のみを移動することにした。
それぞれのカーテンヘッド１ａ、１ｂはウェブｗの幅方向にシフト可能になっている。すなわち、カーテンヘッド１ａ、１ｂはシフト部５を有している。シフト部５はレール５ａとレール５ａと係合する吊持部５ｂとを有し、アクチュエータ８によって駆動される。アクチュエータ８は油圧シリンダや電動シリンダなどがよい。カーテンヘッド１ａからの塗料の噴出幅はウェブｗの幅よりも大きくなっており、カーテンヘッド１ｂからの塗料の噴出幅はウェブｗの幅よりも小さくなっている。６はウェブｗの蛇行を検出する蛇行検出センサーである。蛇行検出センサー６はたとえばＣＣＤカメラを用いてウェブの一端の位置を検出するものであってもよい。
蛇行検出センサー６からの信号はコントローラ７に送られ、そこからの制御信号がカーテンヘッド１ａ、１ｂのアクチュエータ８ａ、８ｂに送られ、カーテンヘッド１ａ、１ｂをウェブの蛇行に合わせて幅方向の位置を制御するようになっている。
図２において、ウェブｗの中立位置は実線で示され、蛇行位置が点線で示されており、ｘは中立位置と蛇行位置との間の距離である。また、カーテンヘッド１ａ、１ｂの中立位置は実線で示され、アクチュエータ８ａ、８ｂによって移動した状態は点線で示されている。この移動量はｘに等しい。
次に本実施形態の作用を説明する。（１）それぞれのカーテンヘッド１ａ、１ｂはウェブｗの幅方向にシフト可能になっていて、蛇行検出センサー６からの信号でウェブの蛇行に合わせてウェブｗの幅方向の位置を制御しているので、塗料カーテンｃａ、ｃｂとウェブｗの幅方向の相対的な位置は常に一定に保たれていて、紙の端部が塗工されない状態で通過してしまうようなことは起こらない。（２）２つのカーテンヘッド１ａ、１ｂは別体になっており、それぞれのカーテンヘッド１ａ、１ｂから噴出される全部の塗料を受けてそれぞれ別々に回収する塗料回収手段４ａ、４ｂを有しているので、塗工前と塗工後の塗料の回収と水回しを問題なく行える。（３）カーテンヘッド１ａからの塗料の噴出幅はウェブｗの幅よりも大きくなっており、カーテンヘッド１ｂからの塗料の噴出幅はウェブｗの幅よりも小さくなっていて、塗料の全てがウェブｗ上に残るのでウェブｗの両端から溢れ出た部分の塗料カーテンｃａには塗料カーテンｃｂの１部が混入することはなく、２つのカーテンヘッドについて別々の塗料を使用しても問題なく回収できる。
本発明は、以上述べた実施形態に限定されるものではなく、本発明の要旨を逸脱しない範囲で種々の変更が可能である。たとえば、蛇行検出センサーはＣＣＤカメラであるとして説明したが光電管式等ほかの形式のものでもよい。 Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a side view of the coating apparatus of the present invention, and FIG. 2 is a plan view of the same. Fig. 3 (A) is a partial side view of the coating apparatus during the coating operation, and Fig. 3 (B) is a state in which the paint is sprayed before starting the coating, or after the coating is completed It is a partial side view of the coating apparatus which shows the state which is doing. In these drawings, the same reference numerals are used for the same parts as those shown in FIGS. 4 to 7 used for explaining the prior art.
As shown in these drawings, the coating apparatus of the present invention is a coating apparatus that applies paint in two layers on the web w surface to be conveyed. It has two curtain heads 1a and 1b which are arranged at an arbitrary interval and each sprays paint downward. Reference numeral 2 denotes a guide sheet, and two paint layers are formed by sequentially laminating paints sequentially ejected from the two curtain heads 1a and 1b toward the slope 2a as they move on the slope 2a. And the paint layer is transferred onto the surface of the web w as paint curtains ca and cb from the downward curtain guide part 2b of the lower end of the slope 2a.
Since the paint curtain ca has a wider width than the web w, the paint curtain ca overflowing from both ends of the web w is collected by the color pan 3 as shown in FIG. As shown in FIG. 3B, prior to coating on the web w, there is provided a paint collecting means for receiving all the paints ejected from the respective curtain heads 1a and 1b and collecting them separately. The paint recovery means has a width wider than the paint jet width of the curtain head 1a, and has a width wider than the paint jet width of the curtain head 1b and the color pan 4a for recovering the entire amount of paint or water jetted from the curtain head 1a. And a color pan 4b that collects the total amount of paint or water ejected from the curtain head 1b, and the paint collected by the color pans 4a and 4b is returned to the respective raw material supply systems by a pump (not shown). . In FIG. 7B, it has been described that the curtain heads 1a and 1b are moved when the operation preparation stage is shifted to the operation stage, but in FIG. 3B, only the guide sheet 2 is moved.
Each curtain head 1a, 1b can be shifted in the width direction of the web w. That is, the curtain heads 1 a and 1 b have the shift unit 5. The shift unit 5 includes a rail 5 a and a suspension unit 5 b that engages with the rail 5 a, and is driven by an actuator 8. The actuator 8 is preferably a hydraulic cylinder or an electric cylinder. The jet width of the paint from the curtain head 1a is larger than the width of the web w, and the jet width of the paint from the curtain head 1b is smaller than the width of the web w. A meandering detection sensor 6 detects the meandering of the web w. The meandering detection sensor 6 may detect the position of one end of the web using a CCD camera, for example.
A signal from the meandering detection sensor 6 is sent to the controller 7, and a control signal therefrom is sent to the actuators 8a and 8b of the curtain heads 1a and 1b. The curtain heads 1a and 1b are positioned in the width direction in accordance with the meandering of the web. Is to control.
In FIG. 2, the neutral position of the web w is indicated by a solid line, the meandering position is indicated by a dotted line, and x is the distance between the neutral position and the meandering position. The neutral positions of the curtain heads 1a and 1b are indicated by solid lines, and the states moved by the actuators 8a and 8b are indicated by dotted lines. This amount of movement is equal to x.
Next, the operation of this embodiment will be described. (1) Each curtain head 1a, 1b can be shifted in the width direction of the web w, and the position of the web w in the width direction is controlled by a signal from the meander detection sensor 6 according to the meandering of the web. Therefore, the relative positions of the paint curtains ca, cb and the web w in the width direction are always kept constant, and the paper edge does not pass through without being coated. (2) The two curtain heads 1a and 1b are separated from each other, and have paint collecting means 4a and 4b that receive all the paints ejected from the respective curtain heads 1a and 1b and collect them separately. As a result, the paint can be collected and watered before and after coating without any problems. (3) The jet width of the paint from the curtain head 1a is larger than the width of the web w, the jet width of the paint from the curtain head 1b is smaller than the width of the web w, and all of the paint is web. Part of the paint curtain cb does not enter the paint curtain ca overflowing from both ends of the web w because it remains on w, and even if different paints are used for the two curtain heads, they can be recovered without problems. .
The present invention is not limited to the embodiment described above, and various modifications can be made without departing from the gist of the present invention. For example, although the meandering detection sensor has been described as being a CCD camera, other types such as a phototube type may be used.

本発明の塗工装置の側面図である。It is a side view of the coating apparatus of this invention. 本発明の塗工装置の平面図である。It is a top view of the coating device of the present invention. 本発明の塗工装置の部分側面であり、（Ａ）は塗工の操業中の状態を示し、（Ｂ）は塗工の準備中の状態を示している。It is the partial side surface of the coating apparatus of this invention, (A) shows the state in operation of coating, (B) has shown the state in preparation of coating. 従来の２層式カーテンコータの要部断面図である。It is principal part sectional drawing of the conventional 2 layer type curtain coater. 従来の２層式カーテンコータのカーテンヘッドの断面図である。It is sectional drawing of the curtain head of the conventional 2 layer type curtain coater. 先の出願の２層式カーテンコータの図面で、（Ａ）は要部断面図であり、（Ｂ）は（Ａ）のＢ矢視図である。In the drawing of the two-layer curtain coater of the previous application, FIG. 先の出願の塗工装置の部分側面であり、（Ａ）は塗工の操業中の状態を示し、（Ｂ）は塗工の準備中の状態を示している。It is the partial side surface of the coating apparatus of a previous application, (A) has shown the state in operation of coating, (B) has shown the state in preparation of coating.

符号の説明Explanation of symbols

１ａ カーテンヘッド
１ｂ カーテンヘッド
２ ガイドシート
４ａ 塗料回収手段（カラーパン）
４ｂ 塗料回収手段（カラーパン）
５ シフト部
６ 蛇行検出センサー
ｗ ウェブ（紙） 1a Curtain head 1b Curtain head 2 Guide sheet 4a Paint recovery means (color pan)
4b Paint recovery means (color pan)
5 Shift section 6 Meander detection sensor w Web (paper)

Claims (2)

搬送されるウェブ面上に塗料を２層に塗布する塗工装置であって、任意の間隔をもって配設され、塗料をそれぞれ下方に向け噴出させる２個のカーテンヘッドと、前記２個のカーテンヘッドからそれぞれ順次斜面に向かって噴出される塗料を、該斜面上を移動させるに伴い順番に積層して２層の塗料層を形成し、該斜面の下端部の下向きのカーテンガイド部から該塗料層を塗料カーテンとしてウェブ面上に移行させるガイドシートと、ウェブへの塗工前にそれぞれのカーテンヘッドから噴出される全部の塗料を受けてそれぞれ別々に回収する塗料回収手段とを備えてなる塗工装置において、それぞれのカーテンヘッドはウェブの幅方向にシフト可能になっているとともに、一方のカーテンヘッドからの塗料の噴出幅はウェブの幅よりも大きくなっており、他方のカーテンヘッドからの塗料の噴出幅はウェブの幅よりも小さくなっており、ウェブの蛇行を検出する蛇行検出センサーを備え、両方のカーテンヘッドはともに蛇行検出センサーからの信号でウェブの蛇行に合わせて幅方向の位置が制御されるようになっていることを特徴とする塗工装置。     A coating apparatus for applying paint in two layers on a web surface to be conveyed, two curtain heads arranged at an arbitrary interval and spraying the paint downward respectively, and the two curtain heads Each of the paints sequentially ejected toward the slope is sequentially laminated as the surface is moved to form two paint layers, and the paint layer is formed from the downwardly directed curtain guide portion of the slope. A coating sheet comprising a guide sheet for transferring the paint as a paint curtain onto the web surface, and a paint collecting means for receiving all the paints ejected from the respective curtain heads and collecting them separately before coating on the web In the apparatus, each curtain head can be shifted in the width direction of the web, and the jetting width of the paint from one curtain head is larger than the width of the web. The jet width of the paint from the other curtain head is smaller than the width of the web, and it has a meandering detection sensor that detects the meandering of the web. Both curtain heads are signals from the meandering detection sensor. A coating apparatus characterized in that the position in the width direction is controlled according to the meandering of the web. 搬送されるウェブ面上に塗料を２層に塗布する塗工装置であって、任意の間隔をもって配設され、塗料をそれぞれ下方に向け噴出させる２個のカーテンヘッドと、前記２個のカーテンヘッドからそれぞれ順次斜面に向かって噴出される塗料を、該斜面上を移動させるに伴い順番に積層して２層の塗料層を形成し、該斜面の下端部の下向きのカーテンガイド部から該塗料層を塗料カーテンとしてウェブ面上に移行させるガイドシートと、ウェブへの塗工前にそれぞれのカーテンヘッドから噴出される全部の塗料を受けてそれぞれ別々に回収する塗料回収手段とを備えてなり、それぞれのカーテンヘッドはウェブの幅方向にシフト可能になっているとともに、一方のカーテンヘッドからの塗料の噴出幅はウェブの幅よりも大きくなっており、他方のカーテンヘッドからの塗料の噴出幅はウェブの幅よりも小さくなっており、ウェブの蛇行を検出する蛇行検出センサーを備えてなる塗工装置において、蛇行検出センサーからの信号でウェブの蛇行に合わせて両方のカーテンヘッドの幅方向の位置を制御することを特徴とする塗工方法。     A coating apparatus for applying paint in two layers on a web surface to be conveyed, two curtain heads arranged at an arbitrary interval and spraying the paint downward respectively, and the two curtain heads Each of the paints sequentially ejected toward the slope is sequentially laminated as the surface is moved to form two paint layers, and the paint layer is formed from the downwardly directed curtain guide portion of the slope. A guide sheet for transferring the paint as a paint curtain onto the web surface, and a paint collecting means for receiving all the paint sprayed from each curtain head before coating on the web and collecting each separately. The curtain head can be shifted in the width direction of the web, and the jet width of the paint from one curtain head is larger than the width of the web, while the other The coating width of the paint from the curtain head is smaller than the width of the web. In the coating apparatus provided with the meandering detection sensor for detecting the meandering of the web, the signal from the meandering detection sensor matches the meandering of the web. A coating method characterized by controlling the position in the width direction of both curtain heads.
JP2005318582A 2005-11-01 2005-11-01 Coating apparatus and coating method Expired - Fee Related JP4902984B2 (en)

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JP2005318582A JP4902984B2 (en) 2005-11-01 2005-11-01 Coating apparatus and coating method
DE502006004846T DE502006004846D1 (en) 2005-11-01 2006-10-26 Method and device for at least two-layer application of coating color to the surface of a moving web, in particular paper or board web
AT06122981T ATE442913T1 (en) 2005-11-01 2006-10-26 METHOD AND DEVICE FOR AT LEAST TWO-LAYER APPLICATION OF PAINT PAINT TO THE SURFACE OF A RUNNING WEB, IN PARTICULAR A PAPER OR CARDBOARD WEB
EP06122981A EP1782891B1 (en) 2005-11-01 2006-10-26 Method of and apparatus for deposition of at least two layers of coating colour onto the surface of a moving web, in particular a paper or cardboard web

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JP4902984B2 (en) 2012-03-21
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