JPH078888A - Coating method - Google Patents
Coating methodInfo
- Publication number
- JPH078888A JPH078888A JP15928093A JP15928093A JPH078888A JP H078888 A JPH078888 A JP H078888A JP 15928093 A JP15928093 A JP 15928093A JP 15928093 A JP15928093 A JP 15928093A JP H078888 A JPH078888 A JP H078888A
- Authority
- JP
- Japan
- Prior art keywords
- web
- coating
- organic solvent
- air
- coating film
- 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.)
- Granted
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05C5/00—Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work
- B05C5/02—Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work the liquid or other fluent material being discharged through an outlet orifice by pressure, e.g. from an outlet device in contact or almost in contact, with the work
- B05C5/0245—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
Landscapes
- Application Of Or Painting With Fluid Materials (AREA)
- Coating Apparatus (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は鋼帯等の帯状体（ウエ
ブ）の表面に連続的に塗膜を形成する塗装方法、特にス
リット状のノズルによって塗膜を形成する塗装方法に関
する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coating method for continuously forming a coating film on the surface of a strip (web) such as a steel strip, and more particularly to a coating method for forming a coating film with a slit nozzle.
【０００２】[0002]
【従来の技術】従来のスリット状ノズルコータでは、被
塗工物である帯状体（以下、「ウエブ」という）が同伴
してくる空気が塗膜下に巻込まれて塗膜に気泡状の欠陥
をもたらすために、特開昭６２−１８６９６６号公報及
び特開昭４８−３２９２３号公報に示されるような対策
が講じられていた。即ち、たとえば特開昭６２−１８６
９６６号公報においては、図７に示すように、塗料の溶
剤に吸収され易い、例えばＣＯ2 ガス等の気体を塗布直
前に空気と置換している。即ち、図７において、１０１
は被塗工物であるウエブ、１０２はハックアップロー
ル、１０３はスリットノズル、１０４は塗料供給用ポン
プ、１０５は塗料、１０６はスリットノズル１０３から
吹出される生塗膜、１０７はウエブ１０１に塗装後の塗
膜、１０８は減圧室、１０９はＣＯ2 ガス等の空気置換
用気体を供給するガスノズル、１１０は減圧用ポンプを
それぞれ示す。2. Description of the Related Art In a conventional slit-shaped nozzle coater, air entrained by a belt-shaped body (hereinafter referred to as "web"), which is an object to be coated, is entrapped under the coating film to cause bubble-like defects in the coating film. In order to bring about this, measures as shown in JP-A-62-186966 and JP-A-48-32923 have been taken. That is, for example, JP-A-62-186
In Japanese Patent No. 966, as shown in FIG. 7, a gas such as CO 2 gas, which is easily absorbed by the solvent of the paint, is replaced with air immediately before coating. That is, in FIG.
Is a web to be coated, 102 is a hack-up roll, 103 is a slit nozzle, 104 is a paint supply pump, 105 is paint, 106 is a raw coating film blown out from the slit nozzle 103, and 107 is the web 101. The subsequent coating film, 108 is a decompression chamber, 109 is a gas nozzle for supplying a gas for air replacement such as CO 2 gas, and 110 is a decompression pump.
【０００３】図において、ウエブ１０１に同伴されてく
る空気層を減圧室１０８により、ある程度剥離させたの
ち、生塗膜１０６に吸収され易いＣＯ2 ガス等の気体を
ガスノズル１０９から吹出して、生塗膜１０６のウエブ
１０１への接触部１１１では、このＣＯ2 ガス等の供給
気体で空気層を置換するようにしている。In the figure, the air layer entrained in the web 101 is peeled to some extent by the decompression chamber 108, and then a gas such as CO 2 gas, which is easily absorbed by the raw coating film 106, is blown out from the gas nozzle 109, and the raw coating is performed. At the contact portion 111 of the membrane 106 to the web 101, the air layer is replaced with the supplied gas such as CO 2 gas.
【０００４】[0004]
【発明が解決しようとする課題】上記従来のウエブの塗
装方法には解決すべき次の課題があった。The conventional web coating method described above has the following problems to be solved.
【０００５】即ち、特開昭６２−１８６９６６号公報の
方法においては上述の通り走行してくるウエブに同伴さ
れる空気の塗膜への巻込み現象を防止するために、塗料
の溶剤に吸収され易い気体（例えばＣＯ2 ガス）によっ
て同伴空気を置換しているが、この置換気体も気相層厚
にして約１０μｍ程度は塗膜下に巻込まれることになる
ので、塗膜厚が薄い場合には、塗膜中の溶剤に吸収しき
れないで、一部は残留して気泡欠陥を生ずるという問題
がある。That is, in the method disclosed in JP-A-62-186966, in order to prevent the air entrained in the traveling web from being entrained in the coating film as described above, it is absorbed in the solvent of the coating material. The entrained air is replaced by an easy gas (for example, CO 2 gas), but this replacement gas is also entrained under the coating film in a gas phase layer thickness of about 10 μm, so when the coating film thickness is thin. Has a problem that it cannot be completely absorbed by the solvent in the coating film, and a part thereof remains to cause a bubble defect.
【０００６】又、特開昭４８−３２９２３号公報の方法
においては、水又は溶剤の蒸気と空気との混合ガスをウ
エブの塗工面に吹き付けてその表面に水又は溶剤を凝縮
し、塗料との濡れ性を改善することによって、空気巻込
みによる気泡欠陥を生じ難くしているが、同伴空気の置
換を水又は溶剤の蒸気と空気との混合ガスにて行ってい
るので、水又は溶剤蒸気が凝縮する際に、空気を巻込む
危険性があり、塗膜の空気泡巻込みによる欠陥を生ずる
危険性がある。Further, in the method of Japanese Patent Laid-Open No. 48-32923, a mixed gas of water or solvent vapor and air is sprayed onto the coated surface of the web to condense the water or solvent on the coated surface to form a paint. By improving the wettability, bubble defects due to air entrapment are less likely to occur, but since the entrained air is replaced by a mixed gas of water or solvent vapor and air, water or solvent vapor When condensing, there is the risk of entraining air and the risk of defects due to entrainment of air bubbles in the coating.
【０００７】又、同公報においては、ウエブ上に凝縮さ
せる液膜厚を調整するために、ウエブの温度、蒸発用の
液温及び吸引空気の温度の各々を調整しているが、３種
類の温度を調整せねばならぬので、作業が繁雑になると
いう問題がある。Further, in the publication, in order to adjust the liquid film thickness to be condensed on the web, each of the temperature of the web, the temperature of the liquid for evaporation and the temperature of the sucked air is adjusted. Since the temperature has to be adjusted, there is a problem that the work becomes complicated.
【０００８】本発明は上記不具合を解消するため、帯状
体塗装部の空気を殆ど完全に駆除して後、塗装する塗装
方法を提供することを目的とする。In order to solve the above problems, it is an object of the present invention to provide a coating method in which the air in the coated portion of the belt-shaped body is almost completely extinguished and then coating is performed.
【０００９】[0009]
【課題を解決するための手段】本発明は上記課題の解決
手段として次の（１），（２）に記載の塗装方法を提供
しようとするものである。The present invention is intended to provide a coating method described in the following (1) and (2) as a means for solving the above problems.
【００１０】（１）連続走行する帯状体の表面にノズル
を対向配置させ、帯状体の幅方向に延びて開口した該ノ
ズルのスリットより流出する塗布液を帯状体の表面に任
意厚みで塗布する塗装方法において、前記ノズルの帯状
体走行方向の上流側に帯状体の表面に対して、有機溶剤
の混合蒸気を接触、凝縮させたのち上記ノズルにより塗
布することを特徴とする塗装方法。(1) The nozzles are arranged opposite to each other on the surface of the continuously running band, and the coating liquid flowing out from the slit of the nozzle which extends in the width direction of the band and is opened is applied to the surface of the band with an arbitrary thickness. In the coating method, a mixed vapor of an organic solvent is brought into contact with and condensed on the surface of the belt on the upstream side of the nozzle in the traveling direction of the belt, and then the coating is performed by the nozzle.
【００１１】（２）上記（１）記載の塗装方法におい
て、帯状体に有機溶剤を接触させる部位の更に上流側で
帯状体の随伴する空気層を吸引手段により吸引すること
を特徴とする塗装方法。(2) In the coating method according to the above (1), the air layer accompanying the strip is sucked by a suction means further upstream of the portion where the strip is brought into contact with the organic solvent. .
【００１２】[0012]
【作用】本発明は上記のように構成されるので次の作用
を有する。Since the present invention is constructed as described above, it has the following actions.
【００１３】（１）上記（１）の構成にあっては、帯状
体に塗布液を塗布するノズルの帯状体走行方向の上流側
に、帯状体の表面に対して有機溶剤の混合蒸気を接触、
凝縮させたのち、上記ノズルによって塗装を行なうの
で、２種類以上の有機溶剤の混合ガス（蒸気）が帯状体
の塗装面に予め凝縮、液膜を形成し、塗布液と帯状体と
の濡れ性を高め、空気を駆逐すると共に、自からも気体
として残らないので、塗膜に気泡が混入しない。(1) In the structure of (1), the mixed vapor of the organic solvent is brought into contact with the surface of the strip at the upstream side of the nozzle for applying the coating liquid to the strip in the running direction of the strip. ,
After condensation, coating is performed with the above nozzle, so a mixed gas (vapor) of two or more kinds of organic solvents is condensed in advance on the coating surface of the strip to form a liquid film, and the wettability between the coating liquid and the strip is high. The air is eliminated, and air is not left as a gas by itself, so no bubbles are mixed into the coating film.
【００１４】（２）上記（２）の構成にあっては上記
（１）の構成に加え、帯状体の有機溶剤の混合ガスを接
触させる部位の更に上流側で、帯状体の随伴する空気層
を吸引手段により吸引するので、上記（１）の作用に加
え、塗膜に気泡の混入する機会が一層減る。(2) In the configuration of (2) above, in addition to the configuration of (1) above, an air layer entrained by the strip is further provided upstream of the portion of the strip contacting the mixed gas of the organic solvent. Since air is sucked by the suction means, in addition to the effect of (1) above, the chance that air bubbles are mixed in the coating film is further reduced.
【００１５】[0015]
【実施例】本発明の方法の第１、第２実施例を図１〜図
６により説明する。なお、従来例ないしは先の実施例に
用いた装置と同様の装置及び部材には同符号を付し、必
要ある場合を除き、説明を省略する。また、先の実施例
と同様の方法についても、必要ある場合を除き説明を省
略する。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The first and second embodiments of the method of the present invention will be described with reference to FIGS. The same devices and members as those used in the conventional example or the previous embodiment are designated by the same reference numerals, and the description thereof will be omitted unless necessary. The description of the method similar to that of the previous embodiment will be omitted unless it is necessary.
【００１６】（第１実施例）請求項１発明の塗装方法に
係る第１実施例を図１〜図３により説明する。(First Embodiment) A first embodiment of the coating method of the first aspect of the present invention will be described with reference to FIGS.
【００１７】図１は本実施例の方法に用いるウエブ（鋼
帯：帯状体）表面に塗装を施す塗装装置の模式的側断面
図、図２は図１のスリットノズル３、有機溶剤ガス供給
室７近傍の拡大図、図３は本実施例に用いる各有機溶剤
の蒸気圧線図である。FIG. 1 is a schematic side sectional view of a coating apparatus for coating the surface of a web (steel strip: strip) used in the method of this embodiment, and FIG. 2 is a slit nozzle 3 of FIG. 1 and an organic solvent gas supply chamber. 7 is an enlarged view of the vicinity of FIG. 7, and FIG. 3 is a vapor pressure diagram of each organic solvent used in this example.
【００１８】図１、図２において、１は被塗工物のウエ
ブ（帯状体）、２はウエブ１が塗工時に平坦である必要
から、この平坦度を確保するためのバックアップロー
ル、３はウエブ１に塗料液４を塗布するスリットノズ
ル、４は有機溶剤等を含有する塗装用の塗料液、５はス
リットノズル３から吐出される生塗膜、６はウエブ１に
塗装後、生塗膜５が固化した塗膜、７は混合された有機
溶剤１２，１３の混合ガスをウエブ１に接触させるため
の有機溶剤ガス供給室、７ａは有機溶剤ガス供給室７の
壁、８は有機溶剤ガス供給室７に有機溶剤混合ガスを供
給するノズル、９は配管、１０，１１は有機溶剤１２，
１３をそれぞれ格納するためのタンク、１２，１３は有
機溶剤ガス供給室７に供給され、ウエブ１に接触して凝
縮する各有機溶剤、１４，１５はそれぞれのタンク１
０，１１を加熱するためのヒータ、１６は配管、１７は
それぞれの有機溶剤１２，１３のガスを混合するための
ガス混合器、２５は壁７ａ等に有機溶剤１２，１３のガ
スが凝縮しないためのヒータ、２７は有機溶剤１２，１
３の薄膜である。In FIGS. 1 and 2, 1 is a web (strip) of the article to be coated, 2 is a backup roll for ensuring the flatness because the web 1 needs to be flat at the time of coating, and 3 is Slit nozzle for applying the coating liquid 4 to the web 1, 4 is a coating liquid for coating containing an organic solvent, 5 is a raw coating film discharged from the slit nozzle 3, 6 is a raw coating film after coating the web 1. 5 is a solidified coating film, 7 is an organic solvent gas supply chamber for bringing the mixed gas of the mixed organic solvents 12 and 13 into contact with the web 1, 7a is a wall of the organic solvent gas supply chamber 7, and 8 is an organic solvent gas A nozzle for supplying an organic solvent mixed gas to the supply chamber 7, 9 is a pipe, 10 and 11 are organic solvents 12,
Tanks for storing 13 respectively, 12 and 13 are supplied to the organic solvent gas supply chamber 7, and are organic solvents that contact the web 1 and condense, and 14 and 15 are respective tanks 1.
A heater for heating 0 and 11, 16 is a pipe, 17 is a gas mixer for mixing the gases of the respective organic solvents 12 and 13, and 25 is the gas of the organic solvents 12 and 13 does not condense on the wall 7a or the like. Heater 27 for organic solvent 12, 1
3 is a thin film.
【００１９】次に、以上のような構成の塗装装置を用い
て塗装する場合の第１実施例の塗装方法について説明す
る。Next, the coating method of the first embodiment when coating is performed using the coating apparatus having the above-mentioned structure will be described.
【００２０】被塗工物のウエブ１は、その表面に空気層
を随伴した状態でバックアップロール２に巻付けられ
て、有機溶剤ガス供給室７に入る。有機溶剤ガス供給室
７内には、上述の通り２種類の有機溶剤１２，１３から
成る混合ガスがガス供給用のノズル８から供給されてお
り、ウエブ１の表面に、この混合ガスが接触することに
より、有機溶剤１２，１３が凝縮し、図２に示す有機溶
剤１２，１３の薄膜２７をウエブ１表面に形成する。こ
の有機溶剤１２，１３の薄膜２７を形成することによ
り、スリットノズル３から供給される生塗膜５はウエブ
１との濡れ性を良好に維持できるので、空気を巻込むこ
となく塗膜６をウエブ１上に形成することができる。The web 1 of the article to be coated is wound around the backup roll 2 with its surface accompanied by an air layer, and enters the organic solvent gas supply chamber 7. In the organic solvent gas supply chamber 7, a mixed gas composed of two kinds of organic solvents 12 and 13 is supplied from the nozzle 8 for gas supply as described above, and the mixed gas comes into contact with the surface of the web 1. As a result, the organic solvents 12 and 13 are condensed, and the thin film 27 of the organic solvents 12 and 13 shown in FIG. 2 is formed on the surface of the web 1. By forming the thin film 27 of the organic solvents 12 and 13, the raw coating film 5 supplied from the slit nozzle 3 can maintain good wettability with the web 1, so that the coating film 6 can be formed without involving air. It can be formed on the web 1.
【００２１】ところで、塗工前にウエブ１上に形成する
有機溶剤１２，１３の薄膜２７の膜厚は重要で、０．１
〜１０μｍが適切である。１０μｍ以上になると、溶剤
の損失が大となり、又図示しない乾燥炉の負荷が大とな
る。逆に、０．１μｍ以下であると、局所的にウエブ１
に薄膜２７が付着していない個所が存在することが実験
的に判明している。By the way, the thickness of the thin film 27 of the organic solvents 12 and 13 formed on the web 1 before coating is important.
10 μm is suitable. If it is 10 μm or more, the loss of the solvent becomes large, and the load of the drying furnace (not shown) becomes large. On the contrary, when the thickness is 0.1 μm or less, the web 1 is locally
It has been experimentally found that there is a portion where the thin film 27 is not attached.
【００２２】従って、０．１〜１０μｍの有機溶剤１
２，１３の凝縮した薄膜２７を安定して得るには、事前
にウエブ１の表面温度を測定し、このウエブ１温度に見
合うように有機溶剤１２，１３の混合ガスの組成を調整
することにより、初めて可能となる。Therefore, 0.1 to 10 μm of organic solvent 1
In order to obtain the condensed thin film 27 of 2 and 13 stably, the surface temperature of the web 1 is measured in advance, and the composition of the mixed gas of the organic solvents 12 and 13 is adjusted to match the temperature of the web 1. , Will be possible for the first time.
【００２３】例えば、２種類の有機溶剤１２，１３とし
てアセトンとトルエンを使用する場合には有機溶剤１２
としてアセトンを、有機溶剤１３としてトルエンをそれ
ぞれタンク１０及びタンク１１に格納しておき、ヒータ
１４及びヒータ１５をそれぞれ調整することにより、両
有機溶剤１２，１３で構成する混合ガスの組成を変え
る。For example, when acetone and toluene are used as the two kinds of organic solvents 12 and 13, the organic solvent 12 is used.
As acetone and toluene as the organic solvent 13 are stored in the tank 10 and the tank 11, respectively, and the heater 14 and the heater 15 are adjusted, respectively, to change the composition of the mixed gas composed of the both organic solvents 12 and 13.
【００２４】即ち、図３に示すように、アセトンは蒸気
圧が高く、トルエンは蒸気圧が低いので、ウエブ１の表
面温度が基準よりも高い場合には、図１のヒータ１４へ
のインプットを低減し、ヒータ１５へのインプットを増
加することにより、混合ガス中のトルエン成分を増大
し、基準温度の場合と同じ凝縮膜厚を得ることができ
る。又、逆にウエブ１の表面温度が基準よりも低い場合
には、ヒータ１４へのインプットを増加し、ヒータ１５
へのインプットを低減することにより、混合ガス中のア
セトン成分を増大して、基準温度の場合と同じ凝縮膜厚
を得ることができる。That is, as shown in FIG. 3, acetone has a high vapor pressure and toluene has a low vapor pressure. Therefore, when the surface temperature of the web 1 is higher than the reference, the input to the heater 14 of FIG. By decreasing and increasing the input to the heater 15, the toluene component in the mixed gas can be increased and the same condensed film thickness as in the case of the reference temperature can be obtained. On the contrary, when the surface temperature of the web 1 is lower than the reference, the input to the heater 14 is increased and the heater 15
By reducing the input to, it is possible to increase the acetone content in the mixed gas and obtain the same condensed film thickness as at the reference temperature.
【００２５】尚、配管９，１６、混合ガス供給用のノズ
ル８及び有機溶剤ガス供給室７を構成する壁７ａ及びス
リットノズル３の面に、有機溶剤１２，１３の混合ガス
が凝縮しないように、それらを約１００℃以上に加熱し
ておく必要がある。ヒータ２５は、そのために用いる。It should be noted that the mixed gas of the organic solvents 12 and 13 is prevented from condensing on the surfaces of the pipes 9 and 16, the nozzle 8 for supplying the mixed gas, the wall 7a constituting the organic solvent gas supply chamber 7 and the slit nozzle 3. , It is necessary to heat them to about 100 ° C. or higher. The heater 25 is used for that purpose.
【００２６】前述の例は有機溶剤の混合蒸気としてアセ
トンとトルエンとから成る場合であるが、混合蒸気とし
てアセトン、トルエン及びキシレンのように３種類の有
機溶剤から成る混合蒸気を使用しても同じような作用、
効果が得られる。The above-mentioned example is a case where acetone and toluene are used as the mixed vapor of the organic solvent, but the same applies even when a mixed vapor composed of three kinds of organic solvents such as acetone, toluene and xylene is used as the mixed vapor. Like action,
The effect is obtained.
【００２７】（第２実施例）請求項２発明の塗装方法に
係る第２実施例を図４〜図６により説明する。(Second Embodiment) A second embodiment of the coating method of the second aspect of the present invention will be described with reference to FIGS.
【００２８】図４は本実施例の方法に用いる塗装装置の
模式的側断面図、図５は図４の有機溶剤ガス供給室７、
空気吸引室１８近傍の拡大図、図６は本実施例に用いる
各有機溶剤の蒸気圧線図である。FIG. 4 is a schematic side sectional view of a coating apparatus used in the method of this embodiment, and FIG. 5 is an organic solvent gas supply chamber 7 of FIG.
FIG. 6 is an enlarged view of the vicinity of the air suction chamber 18, and FIG. 6 is a vapor pressure diagram of each organic solvent used in this embodiment.
【００２９】図４、図５において、１８はウエブ１の走
行方向より見て、有機溶剤ガス供給室７の上流側に、そ
の下部がウエブ１に近接するよう設けられた空気吸引
室、１９は減圧用ポンプ２０に連通して空気吸引室１８
から空気を吸出すための空気吸引口、２０は空気吸引室
１８を負圧にして、ウエブ１が随伴するその表面の空気
層を吸引し去るための減圧用ポンプ、２１は有機溶剤２
２を溶れるためのタンク、２２は他の有機溶剤１２，１
３と共に混合ガスを作るための有機溶剤、２３はタンク
２１の底部に付設され、有機溶剤２２を暖めて、その蒸
気化を適切に促進するためのヒータ、２６は模式的に示
した、ウエブ１の随伴空気層流、２８は模式的に示した
有機溶剤混合ガス流である。その他の構成は第１実施例
に係る図１、図２と同様である。In FIGS. 4 and 5, reference numeral 18 denotes an air suction chamber provided upstream of the organic solvent gas supply chamber 7 as viewed from the traveling direction of the web 1, and a lower portion thereof is close to the web 1; Air suction chamber 18 communicating with decompression pump 20
An air suction port for sucking air from the device, 20 a negative pressure in the air suction chamber 18, and a depressurizing pump for sucking away the air layer on the surface accompanied by the web 1 and 21 an organic solvent 2
2 is a tank for dissolving 2, 22 is another organic solvent 12, 1
An organic solvent for producing a mixed gas together with 3, 23 is attached to the bottom of the tank 21, a heater for warming the organic solvent 22 and appropriately promoting its vaporization, and 26 is a schematic view of the web 1 And 28 is an organic solvent mixed gas flow schematically shown. Other configurations are similar to those of FIGS. 1 and 2 according to the first embodiment.
【００３０】即ち、第２実施例の場合は、有機溶剤ガス
供給室７の上流側に空気吸引室１８を設けた点、混合蒸
気の有機溶剤として３種類を用いる点が第１実施例と異
なる。That is, the second embodiment is different from the first embodiment in that an air suction chamber 18 is provided on the upstream side of the organic solvent gas supply chamber 7 and that three kinds of organic solvents for mixed vapor are used. .
【００３１】次に、以上のような構成の塗装装置を用い
て塗装する場合の第２実施例の塗装方法について説明す
る。Next, the coating method of the second embodiment in the case of coating using the coating apparatus having the above construction will be described.
【００３２】被塗工物のウエブ１は空気吸引室１８下を
通過することにより、その表面に随伴している空気層の
大部分を随伴空気層流２６の向きに吸引され剥離され
る。When the web 1 of the article to be coated passes under the air suction chamber 18, most of the air layer entrained on the surface of the web 1 is aspirated in the direction of the entrained air laminar flow 26 and separated.
【００３３】次いでウエブ１は有機溶剤ガス供給室７下
を通過することにより、その表面に極く少量残留する随
伴空気を有機溶剤１２，１３，２２の混合ガスにより完
全に置換される。この置換メカニズムは有機溶剤ガス供
給室７から壁７ａを介して空気吸引室１８に向って高速
で流れてくる有機溶剤混合ガス流２８によって残留空気
層が完全に剥離された状態となり、次いで、完全に有機
溶剤１２，１３，２２の混合ガスのみから成る有機溶剤
ガス供給室７に入るので、ウエブ１の表面には有機溶剤
１２，１３，２２の混合ガスのみが存在することとな
る。Next, the web 1 passes under the organic solvent gas supply chamber 7 to completely replace the small amount of the associated air remaining on the surface thereof with the mixed gas of the organic solvents 12, 13, 22. This replacement mechanism is such that the residual air layer is completely separated by the organic solvent mixed gas flow 28 flowing from the organic solvent gas supply chamber 7 through the wall 7a toward the air suction chamber 18 at a high speed, and then the complete removal is completed. Since the gas enters the organic solvent gas supply chamber 7 which is composed of only the mixed gas of the organic solvents 12, 13, and 22, only the mixed gas of the organic solvents 12, 13, and 22 exists on the surface of the web 1.
【００３４】有機溶剤ガス供給室７の気相を構成する有
機溶剤１２，１３，２２の混合ガスは次のようにして作
られる。即ち、例えば有機溶剤１２，１３，２２として
アセトン、ベンゼン及びトルエンの３種類の有機溶剤１
２，１３，２２から成る混合ガスを作成する場合には、
これらの有機溶剤１２，１３，２２の温度−蒸気圧曲線
は図６のようであるので、それぞれの有機溶剤１２，１
３，２２の液を５０℃に加熱すればこれら３種類の混合
蒸気の圧力は７６０トール以上（約９３０トール）を示
すことになる。従って、有機溶剤１２としてアセトン、
１３としてベンゼン又、２２としてトルエンを選定し、
ヒータ１４，１５，２３にてそれぞれを５０℃に加熱し
ておけば配管１６内をこれらの有機溶剤１２，１３，２
２のガスが通過し、ガス混合器１７にて完全に混合され
たのち、配管９を介してノズル８から有機溶剤ガス供給
室７内に約９００トールの圧力で吹込まれる。The mixed gas of the organic solvents 12, 13, 22 which constitutes the gas phase of the organic solvent gas supply chamber 7 is produced as follows. That is, for example, as the organic solvent 12, 13, 22, three kinds of organic solvent 1 of acetone, benzene and toluene are used.
When creating a mixed gas consisting of 2, 13, and 22,
Since the temperature-vapor pressure curves of these organic solvents 12, 13, 22 are as shown in FIG. 6, the respective organic solvents 12, 1
When the liquids of Nos. 3 and 22 are heated to 50 ° C., the pressure of the mixed vapor of these three kinds will be 760 Torr or more (about 930 Torr). Therefore, acetone as the organic solvent 12,
Benzene as 13 and toluene as 22 are selected,
If the heaters 14, 15 and 23 are each heated to 50 ° C., the inside of the pipe 16 will be filled with these organic solvents 12, 13, 2
The second gas passes and is completely mixed in the gas mixer 17, and then is blown from the nozzle 8 into the organic solvent gas supply chamber 7 through the pipe 9 at a pressure of about 900 Torr.
【００３５】なお、有機溶剤ガス供給室７の壁７ａ及び
ウエブ１表面を約５０℃にしておけば、この有機溶剤１
２，１３，２２の混合ガスは凝縮することなくウエブ１
表面に付着したまま、生塗膜５の下面に入り込むが、こ
の生塗膜５がウエブ１に衝突する際の衝突圧によって、
ウエブ１表面の付着混合ガスは容易に液相に凝縮し、塗
膜６中の有機溶剤と同化し、ガス体としては全く残留す
ることはない。If the wall 7a of the organic solvent gas supply chamber 7 and the surface of the web 1 are kept at about 50 ° C., the organic solvent 1
The mixed gas of 2, 13, 22 does not condense on the web 1
Although it adheres to the surface and enters the lower surface of the raw coating film 5, due to the collision pressure when the raw coating film 5 collides with the web 1,
The adhering mixed gas on the surface of the web 1 easily condenses in the liquid phase, is assimilated with the organic solvent in the coating film 6, and does not remain at all as a gas body.
【００３６】本第２実施例では有機溶剤として１２，１
３，２２の３種類を用いたが、３種類に限定されるもの
ではなく、２種類でもよく、４種類以上であってもよ
い。また、用いられる有機溶剤も、アセトン、ベンゼ
ン、トルエンに限定されるものではない。In the second embodiment, the organic solvent is 12,1
Although three types of 3 and 22 are used, the number is not limited to three and may be two or four or more. Moreover, the organic solvent used is not limited to acetone, benzene, or toluene.
【００３７】以上の通り、第１実施例によればウエブ１
に塗料液４を吹き出すスリットノズル３の上流側に有機
溶剤ガス供給室７を設け、有機溶剤１２，１３の混合蒸
気をウエブ１に接触、凝縮させ、しかるのち、スリット
ノズル３から塗料液４を生塗膜５としてウエブ１に吹き
出し、密着塗布させて塗膜６を形成させるので、塗膜６
に空気の入り込む機会がなく、かつ、有機溶剤の混合蒸
気（ガス）は、従来のＣＯ2 ガス等と異なり、常温で凝
縮、液体となると共に塗料の有機溶剤と親和性を有する
ため、直ちに溶け合って気泡を生じることがないので、
塗膜６に空気泡、ガス気泡の巻き込まれる不具合が生じ
ないという利点がある。As described above, according to the first embodiment, the web 1
An organic solvent gas supply chamber 7 is provided on the upstream side of the slit nozzle 3 that blows out the coating liquid 4, and the mixed vapor of the organic solvents 12 and 13 is brought into contact with the web 1 to be condensed, and then the coating liquid 4 is discharged from the slit nozzle 3. Since the raw coating film 5 is blown onto the web 1 and is applied in close contact to form the coating film 6, the coating film 6 is formed.
Unlike conventional CO 2 gas, the mixed vapor (gas) of the organic solvent has no chance of entering air, and is condensed at room temperature to become a liquid and has an affinity with the organic solvent of the paint, so it immediately dissolves. Since it does not generate bubbles,
There is an advantage that air bubbles and gas bubbles are not caught in the coating film 6.
【００３８】また、第２実施例によれば、上記有機溶剤
ガス供給室７の更に上流側に空気吸引室１８を設け、ウ
エブ１が随伴して来る空気層を吸引して取去りながら下
流側の有機溶剤ガス供給室７の混合ガス雰囲気に晒すの
で、第１実施例の利点に加え、空気泡が塗膜６に巻き込
まれる機会が一層、低減するという利点がある。Further, according to the second embodiment, an air suction chamber 18 is provided further upstream of the organic solvent gas supply chamber 7 so that the air layer accompanied by the web 1 is sucked and removed to the downstream side. Since it is exposed to the mixed gas atmosphere in the organic solvent gas supply chamber 7, there is an advantage that the chance of air bubbles being caught in the coating film 6 is further reduced in addition to the advantage of the first embodiment.
【００３９】[0039]
【発明の効果】本発明は上記のように構成されるので次
の効果を有する。Since the present invention is constructed as described above, it has the following effects.
【００４０】（１）請求項１の発明にあっては帯状体に
塗布液を流出する部位の帯状体の移動の上流側に有機溶
剤の混合蒸気を接触、凝縮させるので、塗布液と帯状体
との濡れ性が向上し、空気泡の巻き込みが防止される。
従って気泡のない塗装面が得られる。(1) According to the first aspect of the invention, since the mixed vapor of the organic solvent is contacted and condensed on the upstream side of the movement of the strip-shaped body at the portion where the coating solution flows out to the strip-shaped body, the coating liquid and the strip-shaped body are condensed. Improves wettability with and prevents entrainment of air bubbles.
Therefore, a bubble-free coated surface is obtained.
【００４１】（２）請求項２の発明にあっては上記
（１）の有機溶剤の混合蒸気を接触させる帯状体の部位
の更に上流側に、帯状体が随伴する空気層を吸引する手
段を設けて、その空気層を吸引するので、塗装面に空気
の巻込まれる機会が一層減り、一層、気泡のない塗装面
が得られる。(2) In the invention of claim 2, a means for sucking the air layer accompanied by the strip is further provided on the upstream side of the portion of the strip contacting the mixed vapor of the organic solvent of the above (1). Since the air layer is provided and the air layer is sucked, the chance that air is entrained in the coated surface is further reduced, and a more bubble-free coated surface can be obtained.
【図１】本発明の第１実施例の方法に用いる塗装装置の
模式的側断面図、FIG. 1 is a schematic side sectional view of a coating apparatus used in the method of the first embodiment of the present invention,
【図２】図１の有機溶剤ガス供給室７近傍の拡大図、FIG. 2 is an enlarged view of the vicinity of the organic solvent gas supply chamber 7 of FIG.
【図３】第１実施例の方法に用いる各有機溶剤の蒸気圧
線図、FIG. 3 is a vapor pressure diagram of each organic solvent used in the method of the first embodiment,
【図４】本発明の第２実施例の方法に用いる塗装装置の
模式的側断面図、FIG. 4 is a schematic side sectional view of a coating apparatus used in the method of the second embodiment of the present invention,
【図５】図４の有機溶剤ガス供給室７及び空気吸引室１
８近傍の拡大図、5 is an organic solvent gas supply chamber 7 and an air suction chamber 1 of FIG.
Enlarged view of the vicinity of 8,
【図６】第２実施例の方法に用いる各有機溶剤の蒸気圧
線図、FIG. 6 is a vapor pressure diagram of each organic solvent used in the method of the second embodiment,
【図７】従来例の塗装方法に用いる塗装装置の模式的側
断面図である。FIG. 7 is a schematic side sectional view of a coating apparatus used in a conventional coating method.
１ ウエブ（帯状体） ２ バックアップロール ３ スリットノズル ４ 塗料液 ５ 生塗膜 ６ 塗膜 ７ 有機溶剤ガス供給室 ７ａ 壁 ８ ノズル ９ 配管 １０，１１ タンク １２，１３ 有機溶剤 １４，１５ ヒータ １６ 配管 １７ ガス混合器 １８ 空気吸引室 １９ 空気吸引口 ２０ 減圧用ポンプ ２１ タンク ２２ 有機溶剤 ２３，２５ ヒータ ２６ 随伴空気層流 ２７ 薄膜 ２８ 有機溶剤混合ガス流 1 Web (Strip) 2 Backup Roll 3 Slit Nozzle 4 Paint Liquid 5 Raw Coating 6 Coating 7 Organic Solvent Gas Supply Chamber 7a Wall 8 Nozzle 9 Piping 10, 11 Tank 12, 13 Organic Solvent 14, 15 Heater 16 Piping 17 Gas mixer 18 Air suction chamber 19 Air suction port 20 Decompression pump 21 Tank 22 Organic solvent 23, 25 Heater 26 Accompanying air laminar flow 27 Thin film 28 Organic solvent mixed gas flow
───────────────────────────────────────────────────── フロントページの続き (72)発明者 平井 悦郎 広島市西区観音新町四丁目６番22号 三菱 重工業株式会社広島研究所内 (72)発明者 杉原 正浩 広島市西区観音新町四丁目６番22号 三菱 重工業株式会社広島研究所内 (72)発明者 竹岡 康良 広島市西区観音新町四丁目６番22号 三菱 重工業株式会社広島研究所内 (72)発明者 能見 亮一 大阪市中央区北浜４丁目５番33号 住友金 属工業株式会社内 (72)発明者 野口 之彦 大阪市中央区北浜４丁目５番33号 住友金 属工業株式会社内 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Etsuro Hirai Etsuro Hirai 4-6-22 Kannon Shinmachi, Nishi-ku, Hiroshima City Mitsubishi Heavy Industries Ltd. Hiroshima Research Institute (72) Inventor Masahiro Sugihara 4-6-22 Kannon Shinmachi, Nishi-ku, Hiroshima Mitsubishi Heavy Industries Ltd. Hiroshima Research Laboratory (72) Inventor Yasuyoshi Takeoka 4-6-22 Kannon Shinmachi, Nishi-ku, Hiroshima City Mitsubishi Heavy Industries Ltd. Hiroshima Research Laboratory (72) Inventor Ryoichi Nomi 4-53 Kitahama, Chuo-ku, Osaka Sumitomo Metal Industries, Ltd. (72) Inventor Norihiko Noguchi 4-53, Kitahama, Chuo-ku, Osaka City Sumitomo Metal Industries, Ltd.
Claims (2)
向配置させ、帯状体の幅方向に延びて開口した該ノズル
のスリットより流出する塗布液を帯状体の表面に任意厚
みで塗布する塗装方法において、前記ノズルの帯状体走
行方向の上流側に帯状体の表面に対して、有機溶剤の混
合蒸気を接触、凝縮させたのち上記ノズルにより塗布す
ることを特徴とする塗装方法。1. A coating method in which a nozzle is arranged opposite to the surface of a continuously running strip, and a coating liquid flowing out from a slit of the nozzle which extends in the width direction of the strip and is opened is applied to the surface of the strip with an arbitrary thickness. In the method, a coating method is characterized in that a mixed vapor of an organic solvent is brought into contact with and condensed on the surface of the belt on the upstream side of the nozzle in the traveling direction of the belt, and then applied by the nozzle.
体に有機溶剤を接触させる部位の更に上流側で帯状体の
随伴する空気層を吸引手段により吸引することを特徴と
する塗装方法。2. The coating method according to claim 1, wherein an air layer accompanied by the band-shaped body is sucked by a suction means at an upstream side of a portion where the band-shaped body is brought into contact with the organic solvent.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15928093A JP3258456B2 (en) | 1993-06-29 | 1993-06-29 | Painting method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15928093A JP3258456B2 (en) | 1993-06-29 | 1993-06-29 | Painting method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH078888A true JPH078888A (en) | 1995-01-13 |
| JP3258456B2 JP3258456B2 (en) | 2002-02-18 |
Family
ID=15690348
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP15928093A Expired - Fee Related JP3258456B2 (en) | 1993-06-29 | 1993-06-29 | Painting method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3258456B2 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6524388B1 (en) * | 2000-04-03 | 2003-02-25 | Mitsubishi Heavy Industries, Ltd. | Coating apparatus with a rotatable backing rolling and method thereof |
| JP2003508190A (en) * | 1999-09-01 | 2003-03-04 | メッツォ ペーパー インコーポレイテッド | Curtain coating device and curtain coating method |
| WO2007108156A1 (en) * | 2006-03-16 | 2007-09-27 | Metso Paper, Inc. | Noncontact coater and papermaking machine equipped with the same |
-
1993
- 1993-06-29 JP JP15928093A patent/JP3258456B2/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003508190A (en) * | 1999-09-01 | 2003-03-04 | メッツォ ペーパー インコーポレイテッド | Curtain coating device and curtain coating method |
| US6524388B1 (en) * | 2000-04-03 | 2003-02-25 | Mitsubishi Heavy Industries, Ltd. | Coating apparatus with a rotatable backing rolling and method thereof |
| WO2007108156A1 (en) * | 2006-03-16 | 2007-09-27 | Metso Paper, Inc. | Noncontact coater and papermaking machine equipped with the same |
| JP2007245021A (en) * | 2006-03-16 | 2007-09-27 | Mitsubishi Heavy Ind Ltd | Non-contact coating apparatus and paper making machine provided with the same |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3258456B2 (en) | 2002-02-18 |
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