JP2006194546A - Continuously decompressed drying method and apparatus - Google Patents

Continuously decompressed drying method and apparatus Download PDF

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JP2006194546A
JP2006194546A JP2005008449A JP2005008449A JP2006194546A JP 2006194546 A JP2006194546 A JP 2006194546A JP 2005008449 A JP2005008449 A JP 2005008449A JP 2005008449 A JP2005008449 A JP 2005008449A JP 2006194546 A JP2006194546 A JP 2006194546A
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web
drying
coating film
main body
drying apparatus
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Hiroshi Yoshiba
洋 吉羽
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Dai Nippon Printing Co Ltd
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Dai Nippon Printing Co Ltd
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<P>PROBLEM TO BE SOLVED: To provide a drying method and apparatus capable of drying a coating film of a continuously running web at high speed and with high accuracy without using thermal energy. <P>SOLUTION: The web 2 formed with a liquid coating film by application with the coating film side placed on the top side is allowed to horizontally and continuously pass through the inside of a plurality of drying chambers 9, 10, 11 formed in a dryer body 3. The drying chambers are held in a decompressed state to apply negative pressure to the coating film. A solvent in the coating film is thereby evaporated without heating. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

本発明は、紙、樹脂フィルム、金属箔などの連続状のウェブに印刷またはコーティングによりインキや塗料等を塗布して形成した液状の塗膜を乾燥する技術分野に属する。   The present invention belongs to the technical field of drying a liquid coating film formed by applying ink or paint on a continuous web such as paper, resin film, metal foil or the like by printing or coating.

従来、連続状のウェブにインキ、塗料等を塗布して形成した液状の塗膜の乾燥には、一般的に、（１）ウェブを走行させ、そのウェブに乾燥用の熱風等の気流をほぼ直角方向に吹き付ける衝突流乾燥方式（例えば、特開２００４−１４１７５９号公報参照）、（２）ウェブを走行させ、そのウェブを赤外線ヒータで加熱する赤外線乾燥方式、（３）ウェブを走行させ、そのウェブに乾燥用の熱風等の気流をほぼ平行に流す並行流乾燥方式、（４）ウェブを加熱したドラムの外周面に接触させて乾燥するドラム乾燥方式が用いられており、高いエネルギー効率により高速乾燥を行いたい場合には（１）の衝突流乾燥方式が用いられている。また、高精度（均一）に乾燥を行いたい場合には、塗膜に気流を直接衝突させない（２）赤外線乾燥方式又は（３）並行流乾燥方式が用いられている。
特開２００４−１４１７５９号公報 Conventionally, in order to dry a liquid coating film formed by applying ink, paint, etc. to a continuous web, generally, (1) the web is run, and an air current such as hot air for drying is applied to the web. Collision flow drying method that blows in a right angle direction (see, for example, Japanese Patent Application Laid-Open No. 2004-141759), (2) Infrared drying method in which the web is run and the web is heated by an infrared heater, (3) The web is run, A parallel-flow drying method in which an air flow such as hot air for drying is applied in parallel to the web, and (4) a drum drying method in which the web is dried by bringing it into contact with the outer peripheral surface of the heated drum. When drying is desired, the collision flow drying method (1) is used. Further, when it is desired to perform drying with high accuracy (uniform), (2) an infrared drying method or (3) a parallel flow drying method in which an airflow is not directly collided with the coating film is used.
JP 2004-141759 A

高速乾燥に適した衝突流乾燥方式の場合、高速の衝突流を液状の塗膜に与え、塗膜上面に形成されている境界層を破壊し、かつ蒸発した溶媒を速やかに取り除くことにより乾燥を行っている。しかしこの方式では、高速の衝突流を発生させるために大量の熱エネルギーを使い、ランニングコストが高くなる。また、熱効率の向上を考慮し、給排気の循環を行うが、効率や安全面から溶媒濃度を適正に保つ必要があり、そのための測定器等設置にコストがかかるといった問題がある。   In the case of a collision flow drying method suitable for high-speed drying, drying is performed by applying a high-speed collision flow to the liquid coating film, destroying the boundary layer formed on the top surface of the coating film, and quickly removing the evaporated solvent. Is going. However, this method uses a large amount of heat energy to generate a high-speed collision flow, which increases the running cost. In consideration of improvement in thermal efficiency, supply and exhaust are circulated. However, there is a problem that it is necessary to keep the solvent concentration appropriate in terms of efficiency and safety, and installation of a measuring instrument for that purpose is costly.

高精度乾燥に適した赤外線乾燥方式の場合、高価な赤外線ヒータを必要とするため設備コストが一般的に高くなる傾向がある。また、並行流乾燥方式の場合には、ウェブに沿わせて給気を行うために層流を発生する必要があり、この際にも設備コストが高くなるとともに、装置サイズ（長さ）も大きくなる傾向があるといった問題がある。   In the case of an infrared drying method suitable for high-precision drying, an expensive infrared heater is required, so that the equipment cost generally tends to be high. In the case of the parallel flow drying method, it is necessary to generate a laminar flow in order to supply air along the web. In this case as well, the equipment cost is increased and the apparatus size (length) is also increased. There is a problem that tends to be.

本発明はかかる問題点に鑑みてなされたもので、熱エネルギーを使用することなく乾燥を行うことでランニングコストの削減を行うことができ、更に、設備コストを削減すると共に装置サイズ（長さ）も短縮でき、しかも高速乾燥、高精度乾燥を可能とする乾燥方法及び装置を提供することを課題とする。   The present invention has been made in view of such problems, and it is possible to reduce running costs by performing drying without using heat energy, and further reduce equipment costs and apparatus size (length). It is an object of the present invention to provide a drying method and apparatus capable of shortening the speed and drying at high speed and high accuracy.

上記課題を解決すべくなされた本発明は、液状の塗膜の溶媒を蒸発させるために熱エネルギーを使用せず、減圧を利用したものである。すなわち、本願請求項１に係る発明は、塗布により連続状のウェブの表面に形成した液状の塗膜を乾燥する方法であって、前記ウェブを連続的に、減圧状態に保持している空間内を通過させ、前記液状の塗膜に含まれている溶媒を蒸発させることを特徴とする連続式減圧乾燥方法である。   The present invention, which has been made to solve the above-mentioned problems, uses reduced pressure without using thermal energy to evaporate the solvent of the liquid coating film. That is, the invention according to claim 1 of the present application is a method for drying a liquid coating film formed on the surface of a continuous web by coating, wherein the web is continuously held in a reduced pressure state. Is passed, and the solvent contained in the liquid coating film is evaporated.

また、本願請求項２に係る発明は、塗布により連続状のウェブの表面に形成した液状の塗膜を乾燥する装置であって、前記ウェブが水平に通り抜けることができるように配置されたウェブ入口及びウェブ出口を有し、該ウェブ入口とウェブ出口の間を走行中のウェブを取り囲む空間を形成する乾燥装置本体と、該乾燥装置本体内の、前記ウェブを取り囲む空間の少なくとも一部領域を減圧状態に保持するよう前記乾燥装置本体に接続された減圧手段と、前記乾燥装置本体を、前記ウェブが水平に且つ連続的に通過するように前記ウェブを案内する手段を有することを特徴とする連続式減圧乾燥装置である。   Further, the invention according to claim 2 of the present application is an apparatus for drying a liquid coating film formed on the surface of a continuous web by coating, and the web inlet arranged so that the web can pass horizontally. A drying apparatus main body having a web outlet and forming a space surrounding the web running between the web inlet and the web outlet, and at least a partial area of the space surrounding the web in the drying apparatus main body is decompressed Continuously comprising pressure reducing means connected to the drying apparatus main body so as to maintain the state, and means for guiding the web so that the web passes horizontally and continuously through the drying apparatus main body. This is a vacuum drying apparatus.

請求項３に係る発明は、上記した請求項２に記載の連続式減圧乾燥装置において、前記乾燥装置本体内を、隔壁によって、ウェブの走行方向に関して３個以上の乾燥室に分割し、前記減圧手段で、前記乾燥室内の減圧度をウェブ入口から徐々に上げ、次いでウェブ出口側に向かい徐々に下げるように前記乾燥装置本体内を減圧する構成としたものである。   The invention according to claim 3 is the continuous reduced pressure drying apparatus according to claim 2, wherein the inside of the drying apparatus is divided into three or more drying chambers in the web running direction by a partition wall, In this configuration, the inside of the drying apparatus body is decompressed so that the degree of decompression in the drying chamber is gradually increased from the web inlet and then gradually decreased toward the web outlet.

請求項４に係る発明は、上記した請求項２又は３記載の連続式減圧乾燥装置において、前記乾燥装置本体内のウェブ入口に隣接した領域及びウェブ出口に隣接した領域のそれぞれに、隔壁によって、前記減圧手段に連結されて減圧されている領域から分離された圧力調整室を形成したものである。   The invention according to claim 4 is the continuous reduced-pressure drying apparatus according to claim 2 or 3, wherein a partition wall is provided in each of the region adjacent to the web inlet and the region adjacent to the web outlet in the drying device body. A pressure regulating chamber is formed which is connected to the decompression means and is separated from the decompressed region.

請求項５に係る発明は、上記した請求項２から４のいずれか１項記載の連続式減圧乾燥装置において、前記乾燥装置本体のウェブ入口に乾燥装置本体内への外気の侵入を防ぐため、ウェブをはさむように２個のロールを設け、更に前記ウェブの液状の塗膜に接触する側のロールをウェブ走行方向とは逆方向に回転させ、該ロールの上流側のウェブ表面の塗膜を該ロールを通り抜けたウェブ表面に転写する構成としたものである。   The invention according to claim 5 is the continuous vacuum drying apparatus according to any one of claims 2 to 4 described above, in order to prevent the outside air from entering the drying apparatus main body at the web inlet of the drying apparatus main body. Two rolls are provided so as to sandwich the web, and further, the roll on the side contacting the liquid coating film of the web is rotated in the direction opposite to the web running direction, and the coating film on the web surface on the upstream side of the roll is formed. The web is transferred onto the web surface that has passed through the roll.

請求項６に係る発明は、上記した請求項５記載の連続式減圧乾燥装置において、前記ウェブ入口に設けられている転写用のロールの表面に形成される塗膜の乾燥を防止するよう、前記ウェブ入口側の圧力調整室に溶媒蒸気を噴射する溶媒噴射手段を設けたものである。   The invention according to claim 6 is the continuous vacuum drying apparatus according to claim 5, wherein the coating film formed on the surface of the transfer roll provided at the web inlet is prevented from being dried. Solvent injection means for injecting solvent vapor is provided in the pressure adjustment chamber on the web inlet side.

請求項７に係る発明は、上記した請求項６記載の連続式減圧乾燥装置において、前記乾燥装置本体内で蒸発した溶媒を回収し、その一部を前記溶媒噴射手段に供給する手段を設けたものである。   The invention according to claim 7 is the continuous reduced-pressure drying apparatus according to claim 6, further comprising means for recovering the solvent evaporated in the drying apparatus body and supplying a part thereof to the solvent injection means. Is.

請求項８に係る発明は、上記した請求項６又は７記載の連続式減圧乾燥装置において、前記ウェブ入口側の圧力調整室内が爆発下限界を越えないよう、該圧力調整室に不活性ガスを送り込む不活性ガス供給手段を設けたものである。   The invention according to claim 8 is the continuous vacuum drying apparatus according to claim 6 or 7, wherein an inert gas is supplied to the pressure adjusting chamber so that the pressure adjusting chamber on the web inlet side does not exceed the lower explosion limit. An inert gas supply means for feeding is provided.

請求項９に係る発明は、上記した請求項２から８のいずれか１項記載の連続式減圧乾燥装置において、前記乾燥装置本体のウェブ出口に乾燥装置本体内への外気の侵入を防ぐため、ウェブをはさむように２個のロールを設けたものである。   The invention according to claim 9 is the continuous reduced-pressure drying apparatus according to any one of claims 2 to 8, in order to prevent intrusion of outside air into the drying apparatus body at the web outlet of the drying apparatus body. Two rolls are provided so as to sandwich the web.

本発明の乾燥方法及び装置では、液状の塗膜を形成したウェブを連続的に走行させながら減圧雰囲気中を通過させる構成としたことで、熱エネルギーを使用することなく高速乾燥が可能となり、ランニングコストを削減できると共に設備コストも削減でき、更に装置サイズ（長さ）も従来の乾燥方式に比べて短縮することが可能となる。更に、本発明では気流を液状の塗膜に吹き付けることがないので、塗膜を乱すことがなく、高精度乾燥を高効率で行うことができ、特に、請求項３に係る発明の装置では、ウェブが徐々に減圧度が高くなる乾燥室内を通過するので、液状の塗膜に作用する負圧が徐々に大きくなり、このため、塗膜内の溶媒を突沸させることなく敏速に蒸発させることができ、一層高精度の乾燥を行うことができる。   In the drying method and apparatus of the present invention, the web in which the liquid coating film is formed is configured to pass through the reduced-pressure atmosphere while continuously running, thereby enabling high-speed drying without using heat energy and running. The cost can be reduced and the equipment cost can be reduced, and the apparatus size (length) can be reduced as compared with the conventional drying method. Furthermore, in the present invention, since the air current is not sprayed on the liquid coating film, the coating film is not disturbed, and high-precision drying can be performed with high efficiency. In particular, in the apparatus of the invention according to claim 3, Since the web passes through the drying chamber where the degree of decompression gradually increases, the negative pressure acting on the liquid coating gradually increases, so that the solvent in the coating can be evaporated quickly without causing sudden boiling. And more accurate drying can be performed.

図１は本発明の好適な実施の形態に係る連続式減圧乾燥装置の概略構成図、図２はその乾燥装置におけるウェブ入口領域を示す概略断面図である。全体を参照符号１で示す連続式減圧乾燥装置は、塗布により連続状のウェブ２の表面に形成した液状の塗膜を乾燥するための装置であり、そのウェブ２が水平に通り抜けることができるように配置されたウェブ入口４及びウェブ出口５を有し、そのウェブ入口４とウェブ出口５の間を走行中のウェブを取り囲む空間を形成する乾燥装置本体３を備えている。この乾燥装置本体３の内部は、複数の隔壁７により、ウェブ入口４側から第一圧力調整室８、第一乾燥室９、第二乾燥室１０、第三乾燥室１１、第二圧力調整室１２に分割されている。   FIG. 1 is a schematic configuration diagram of a continuous vacuum drying apparatus according to a preferred embodiment of the present invention, and FIG. 2 is a schematic cross-sectional view showing a web inlet region in the drying apparatus. The continuous vacuum drying apparatus denoted as a whole by reference numeral 1 is an apparatus for drying a liquid coating film formed on the surface of a continuous web 2 by coating so that the web 2 can pass horizontally. A web inlet 4 and a web outlet 5 arranged between the web inlet 4 and the web outlet 5, and a drying device main body 3 forming a space surrounding the running web. The interior of the drying apparatus main body 3 includes a plurality of partition walls 7 from the web inlet 4 side to the first pressure adjusting chamber 8, the first drying chamber 9, the second drying chamber 10, the third drying chamber 11, and the second pressure adjusting chamber. It is divided into 12.

第一乾燥室９、第二乾燥室１０、第三乾燥室１１は通過するウェブ２に減圧を作用させて液状の塗膜から溶媒を蒸発、除去するためのものである。各乾燥室９〜１１には吸引口１４が設けられ、その吸引口１４には溶媒回収装置１５を介してブロワー等の減圧手段１６が接続され、乾燥室９〜１１内を吸引して所望の減圧度に減圧することができるようにしている。乾燥室９〜１１の減圧度は、後述するように、中央の乾燥室１０が最も高く（絶対圧力が低くなる）ように設定される。第一圧力調整室８は、外気と第一乾燥室９の圧力差が大きくなって外気の侵入量が多くなるのを防ぐため、及び、ウェブ入口４に設けたロール２２（詳細は後述）の上面で高速の気流が発生するのを防ぐために設けたものである。また、第二圧力調整室１２も、外気と第三乾燥室１１の圧力差が大きくなって外気の侵入量が多くなるのを防ぐために設けたものである。各圧力調整室８、１２にはそれぞれ給排気口１８が設けられ、その給排気口１８には給排気手段１９が接続され、圧力調整室８、１２を給気又は排気して所望の減圧度に調整するようになっている。   The first drying chamber 9, the second drying chamber 10, and the third drying chamber 11 are for evaporating and removing the solvent from the liquid coating film by applying a reduced pressure to the passing web 2. Each of the drying chambers 9 to 11 is provided with a suction port 14, and a decompression means 16 such as a blower is connected to the suction port 14 via a solvent recovery device 15, and the inside of the drying chambers 9 to 11 is sucked to obtain a desired The pressure can be reduced at a reduced pressure level. The degree of decompression of the drying chambers 9 to 11 is set so that the central drying chamber 10 is the highest (the absolute pressure decreases), as will be described later. The first pressure adjusting chamber 8 is used to prevent the pressure difference between the outside air and the first drying chamber 9 from increasing and the amount of intruding outside air from increasing, and the roll 22 provided at the web inlet 4 (details will be described later). This is provided to prevent high-speed airflow from occurring on the upper surface. The second pressure adjusting chamber 12 is also provided in order to prevent the pressure difference between the outside air and the third drying chamber 11 from becoming large and increasing the amount of intruding outside air. The pressure adjusting chambers 8 and 12 are each provided with an air supply / exhaust port 18, and an air supply / exhaust means 19 is connected to the air supply / exhaust port 18 to supply or exhaust the pressure adjusting chambers 8 and 12 to a desired degree of pressure reduction. It is supposed to adjust to.

ウェブ入口４には、乾燥装置本体３内への外気の侵入を防ぐため、ウェブをはさむように２個のロール２１、２２が設けられている。図３に拡大して示すように、下側のロール２１は走行中のウェブ２と同方向に回転（ウェブ１と接触する部分が同方向となるように回転）するように駆動されている。一方、上側のロール２２すなわちウェブ２の上面に形成している液状の塗膜２４に接する側のロール２２は、ウェブ２の走行方向とは逆方向に回転するように駆動されている。これは、ロール２２の上流側のウェブ表面の液状の塗膜２４を一旦、ロール２２の表面に保持し、次いでロール２２を通り抜けたウェブ２の表面に転写させるためである。このようにロール２２を転写用のロールとして作用させ、ロール２２の上流、下流間で液膜の転写を行うことで、ロール２２を通り過ぎたウェブ２の表面に平滑な表面の塗膜２４を再度形成でき、従って、ウェブ２を、塗膜２４の表面を乱すことなく、乾燥装置本体３内に送り込むことができる。ロール２１、２２と、その上下に位置する乾燥装置本体の壁３ａの間隔は、外気の侵入を防止するため極力小さく選定するが、上側のロール２２と壁３ａの間隔は、あまり小さくすると、その部分を通って圧力調整室８に吸い込まれる気流の速度が大きくなり、その気流によってロール２２の表面の塗膜の乱れが大きくなるので、適度に広くしておく。なお、ロール２２の表面に形成される塗膜は、その表面が多少乱れていても、ウェブ２に転写した際に塗膜表面が平滑となるので、多少の乱れは許容でき、このため、ロール２２と壁３ａの間隔は、ロール２２を用いない場合におけるウェブ２と壁３ａとの間隔に比べてかなり小さくすることが可能であり、外気の侵入を効果的に防止できる。   The web entrance 4 is provided with two rolls 21 and 22 so as to sandwich the web in order to prevent the outside air from entering the drying apparatus main body 3. As shown in FIG. 3 in an enlarged manner, the lower roll 21 is driven to rotate in the same direction as the running web 2 (rotate so that the portion in contact with the web 1 is in the same direction). On the other hand, the upper roll 22, that is, the roll 22 on the side in contact with the liquid coating film 24 formed on the upper surface of the web 2 is driven to rotate in the direction opposite to the traveling direction of the web 2. This is because the liquid coating film 24 on the web surface upstream of the roll 22 is temporarily held on the surface of the roll 22 and then transferred to the surface of the web 2 passing through the roll 22. In this way, the roll 22 acts as a transfer roll, and by transferring the liquid film between the upstream and downstream of the roll 22, the coating film 24 with a smooth surface is again applied to the surface of the web 2 that has passed the roll 22. Therefore, the web 2 can be fed into the drying apparatus main body 3 without disturbing the surface of the coating film 24. The distance between the rolls 21 and 22 and the wall 3a of the drying apparatus main body positioned above and below the rolls 21 and 22 is selected to be as small as possible in order to prevent the intrusion of outside air. Since the speed of the airflow sucked into the pressure adjusting chamber 8 through the portion increases and the airflow increases the disturbance of the coating film on the surface of the roll 22, it is appropriately widened. It should be noted that the coating film formed on the surface of the roll 22 has a smooth surface when transferred to the web 2 even if the surface is somewhat disturbed. The distance between the wall 22 and the wall 3a can be made considerably smaller than the distance between the web 2 and the wall 3a when the roll 22 is not used, and the outside air can be effectively prevented from entering.

塗膜の溶媒として乾燥が速い溶媒（特に溶剤）を用いた場合、転写用のロール２２の表面で塗膜２４が乾燥し、粘度が増加して転写後の塗膜２４の表面を乱す恐れがある。そこで、この実施の形態では、図１、図２に示すように、第一圧力調整室８には、ウェブ入口に設けられている転写用のロール２２の表面の塗膜が乾燥するのを防止するため、第一圧力調整室８内に溶媒蒸気を噴射する溶媒噴射手段２６が設けられている。なお、乾燥の遅い溶媒を用いる場合には、溶媒噴射手段２６は省略してもよい。溶媒噴射手段２６に供給する溶媒は、新しい溶媒としてもよいが、この実施の形態では、乾燥装置本体３内で蒸発した溶媒を溶媒回収装置１５で回収し、その一部を配管２７及びポンプ２８によって溶媒噴射手段２６に供給する構成としている。これにより、溶媒消費量を削減できる。   When a fast-drying solvent (especially a solvent) is used as the solvent for the coating film, the coating film 24 may be dried on the surface of the transfer roll 22, and the viscosity may increase to disturb the surface of the coating film 24 after transfer. is there. Therefore, in this embodiment, as shown in FIGS. 1 and 2, the first pressure adjusting chamber 8 prevents the coating film on the surface of the transfer roll 22 provided at the web inlet from drying. For this purpose, solvent injection means 26 for injecting solvent vapor is provided in the first pressure adjustment chamber 8. In addition, when using a slow-drying solvent, the solvent injection means 26 may be omitted. The solvent supplied to the solvent ejecting means 26 may be a new solvent. In this embodiment, the solvent evaporated in the drying apparatus main body 3 is recovered by the solvent recovery apparatus 15, and a part thereof is connected to the pipe 27 and the pump 28. The solvent is supplied to the solvent ejecting means 26. Thereby, solvent consumption can be reduced.

溶媒として溶剤を用いた場合、溶媒噴射手段２６によって第一圧力調整室８内に溶剤を噴射すると、室内の溶剤濃度が上昇して爆発下限界を越えて爆発の恐れが生じることがある。そこで、これを防ぐため、第一圧力調整室８には、該圧力調整室内が爆発下限界を越えないよう、該圧力調整室に窒素等の不活性ガスを送り込む不活性ガス供給手段２９を設けている。なお、爆発の恐れがない場合には、不活性ガス供給手段２９は省略してもよい。   When a solvent is used as the solvent, if the solvent is ejected into the first pressure adjusting chamber 8 by the solvent ejecting means 26, the concentration of the solvent in the chamber may increase and the explosion limit may be exceeded. Therefore, in order to prevent this, the first pressure regulation chamber 8 is provided with an inert gas supply means 29 for sending an inert gas such as nitrogen into the pressure regulation chamber so that the pressure regulation chamber does not exceed the lower explosion limit. ing. If there is no risk of explosion, the inert gas supply means 29 may be omitted.

図１において、ウェブ出口５には、乾燥装置本体内への外気の侵入を防ぐため、ウェブ２をはさむように２個のロール３１、３２が設けられている。このロール３１、３２はウェブ２の走行方向と同方向に回転するように設けられており、ウェブ２の搬送を安定させる作用も果たしている。   In FIG. 1, the web outlet 5 is provided with two rolls 31 and 32 so as to sandwich the web 2 in order to prevent the outside air from entering the drying apparatus main body. These rolls 31 and 32 are provided so as to rotate in the same direction as the traveling direction of the web 2, and also serve to stabilize the conveyance of the web 2.

乾燥装置本体３内には、ウェブ２が液状の塗膜を上側として水平に且つ連続的に通過するように案内する手段として複数のロール３５が設けられている。   A plurality of rolls 35 are provided in the drying apparatus main body 3 as means for guiding the web 2 to pass horizontally and continuously with the liquid coating film as the upper side.

次に、上記構成の乾燥装置１による乾燥動作を説明する。乾燥装置本体３内に形成されている第一圧力調整室８、第一乾燥室９、第二乾燥室１０、第三乾燥室１１、第二圧力調整室１２は、それぞれ、減圧手段１６及び給排気手段１９により所定の減圧度に調整されている。ここで、第一圧力調整室８、第一乾燥室９、第二乾燥室１０、第三乾燥室１１、第二圧力調整室１２のそれぞれの減圧度はウェブ入口４から徐々に上昇し、中央の第二乾燥室１０で最高となり、その後、ウェブ出口５に向かって徐々に低下するように設定されている。すなわち、第一圧力調整室８の減圧度をＱ1 、第一乾燥室９の減圧度をＰ1 、第二乾燥室１０の減圧度をＰ2 、第三乾燥室１1 の減圧度をＰ3 、第二圧力調整室８の減圧度をＱ2 とすると、
外気＜Ｑ1 ＜Ｐ1 ＜ Ｐ2 ＞Ｐ3 ＞Ｑ2 ＞外気
となるように設定している。 Next, the drying operation by the drying apparatus 1 having the above configuration will be described. The first pressure regulating chamber 8, the first drying chamber 9, the second drying chamber 10, the third drying chamber 11, and the second pressure regulating chamber 12 formed in the drying apparatus main body 3 are respectively provided with a decompression means 16 and a supply unit. The pressure is reduced to a predetermined degree by the exhaust means 19. Here, the degree of decompression of each of the first pressure adjusting chamber 8, the first drying chamber 9, the second drying chamber 10, the third drying chamber 11, and the second pressure adjusting chamber 12 gradually increases from the web inlet 4, It becomes the highest in the second drying chamber 10, and then gradually decreases toward the web outlet 5. That, Q 1 a decompression degree of the first pressure regulating chamber 8, P 1 degree of vacuum of the first drying chamber 9, the pressure reduction degree in the second drying chamber 10 P 2, the third drying chamber 1 1 of the decompression degree P 3, the degree of reduced pressure in the second pressure regulating chambers 8 and Q 2,
It is set to be outside air <Q 1 <P 1 < P 2 > P 3 > Q 2 > outside air.

乾燥すべき液状の塗膜を形成したウェブ２は、塗膜を上面側として水平に搬送されてきて、ウェブ入口４から乾燥装置本体３内に入る。この際、ウェブ２はロール２１、２２で案内されているためばたつくことなく走行し、且つ液状の塗膜は転写用のロール２２で転写されることで塗膜面を乱すことがなく、従って、ウェブ２は上面の塗膜を乱すことなく第一圧力調整室８内に入る。また、第一圧力調整室８内には、溶媒噴射手段２６によって溶媒蒸気が噴射されているので、転写用のロール２２の表面にある塗膜の乾燥が防止され、この点からも塗膜面の乱れが防止される。更に、第一圧力調整室８内は、減圧状態には保たれているが、その減圧度は低く設定されているので、ウェブ入口４から外気が高速で流れ込むということがなく、この点からも塗膜面の乱れが防止される。なお、第一圧力調整室８内には不活性ガス供給手段２９により不活性ガスが供給されているので、爆発性の溶剤を用いた場合でも、第一圧力調整室８内は爆発下限界を超えることがなく、安全である。   The web 2 on which the liquid coating film to be dried is formed is transported horizontally with the coating film as the upper surface side, and enters the drying apparatus main body 3 from the web inlet 4. At this time, since the web 2 is guided by the rolls 21 and 22, the web 2 runs without fluttering, and the liquid coating film is transferred by the transfer roll 22 so that the coating surface is not disturbed. The web 2 enters the first pressure adjusting chamber 8 without disturbing the coating film on the upper surface. Further, since the solvent vapor is sprayed into the first pressure adjusting chamber 8 by the solvent spraying means 26, the coating film on the surface of the transfer roll 22 is prevented from being dried. Disturbance is prevented. Furthermore, although the inside of the first pressure regulation chamber 8 is kept in a reduced pressure state, the degree of pressure reduction is set low, so that outside air does not flow from the web inlet 4 at a high speed. Disturbance of the coating surface is prevented. In addition, since inert gas is supplied into the first pressure adjustment chamber 8 by the inert gas supply means 29, even if an explosive solvent is used, the first pressure adjustment chamber 8 has a lower explosion limit. It does not exceed and is safe.

次に、ウェブ２は、第一圧力調整室８よりも高い減圧度に保持されている第一乾燥室９内に入り、この第一乾燥室９内で液状の塗膜から溶媒が蒸発、除去され、乾燥が行われる。ここで、第一乾燥室９内の減圧度としては、塗膜の溶媒が突沸しないように設定しておく。これにより、塗膜の表面を乱すことなく乾燥が行われる。次いで、ウェブ２は第一乾燥室９よりも更に高い減圧度に保持されている第二乾燥室１０内に入り、更に乾燥が進められる。第一乾燥室９及び第二乾燥室１０の減圧度及び長さは、ウェブ２が第二乾燥室１０を出るまでに全溶媒分量の８０％〜１００％程度を乾燥できるように定めるのが好ましい。   Next, the web 2 enters the first drying chamber 9 maintained at a higher degree of decompression than the first pressure adjusting chamber 8, and the solvent evaporates and removes from the liquid coating film in the first drying chamber 9. And drying is performed. Here, the degree of vacuum in the first drying chamber 9 is set so that the solvent of the coating film does not bump. Thereby, drying is performed without disturbing the surface of the coating film. Next, the web 2 enters the second drying chamber 10 that is maintained at a higher degree of vacuum than the first drying chamber 9, and further drying proceeds. The degree of vacuum and the length of the first drying chamber 9 and the second drying chamber 10 are preferably determined so that about 80% to 100% of the total solvent amount can be dried before the web 2 exits the second drying chamber 10. .

次に、ウェブ２は第三乾燥室１１に入り、第三乾燥室１１では、第二乾燥室１０では乾燥し切れなかった溶媒分を乾燥させる。第三乾燥室１１の減圧度は上記したように第二乾燥室１０より低く設定しており、全体のバランスを取る上からは、第一乾燥室９の減圧度と等しくすることが好ましい。その後、ウェブ２は、第二圧力調整室１２を通って外部に排出される。第二圧力調整室１２の減圧度も上記したように第三乾燥室１１より低く設定しており、全体のバランスを取る上からは、第一圧力調整室８の減圧度と等しくすることが好ましい。   Next, the web 2 enters the third drying chamber 11, and in the third drying chamber 11, the solvent that has not been completely dried in the second drying chamber 10 is dried. The degree of vacuum in the third drying chamber 11 is set lower than that in the second drying chamber 10 as described above, and is preferably equal to the degree of vacuum in the first drying chamber 9 in order to balance the whole. Thereafter, the web 2 is discharged to the outside through the second pressure adjusting chamber 12. The degree of decompression of the second pressure regulating chamber 12 is also set lower than that of the third drying chamber 11 as described above, and is preferably equal to the degree of decompression of the first pressure regulating chamber 8 in order to balance the whole. .

以上のようにして、ウェブ２の表面に形成している液状の塗膜が、それに作用する負圧によって、熱エネルギーを使用することなく敏速に乾燥され且つ塗膜表面を乱すこともない。換言すれば、上記構成の乾燥装置１によって高精度乾燥を高効率で行うことができ、また、乾燥装置本体３の長さ（ウェブパス長）を従来よりも短縮できる。   As described above, the liquid coating film formed on the surface of the web 2 is quickly dried without using heat energy and does not disturb the coating film surface due to the negative pressure acting on it. In other words, high-precision drying can be performed with high efficiency by the drying apparatus 1 having the above-described configuration, and the length (web path length) of the drying apparatus main body 3 can be shortened as compared with the prior art.

以上に本発明の好適な実施の形態を説明したが、本発明はこの実施の形態に限定されるものではなく、特許請求の範囲の記載範囲内で適宜変更可能である。例えば、上記した実施の形態では３室の乾燥室９、１０、１１を用いているが、より高精度に乾燥を行う必要がある場合には、更に多くの乾燥室に分割し、減圧度が更に細かく徐々に変化するようにしてもよい。その場合、全体の圧力バランスを取る上からは、乾燥室数を５室又は７室といったように奇数とし、中心の乾燥室が最も減圧度が高くなるようにすることが好ましい。更に、より精密にするため、圧力調整室を増やす方法をとってもよい。また、ラフな乾燥で良い場合には、乾燥室を１室のみとしてもよい。   The preferred embodiment of the present invention has been described above, but the present invention is not limited to this embodiment, and can be appropriately changed within the scope of the claims. For example, in the above-described embodiment, three drying chambers 9, 10, and 11 are used. However, when it is necessary to perform drying with higher precision, the drying chamber is divided into more drying chambers and the degree of vacuum is reduced. Further, it may be changed gradually and gradually. In that case, in order to balance the overall pressure, it is preferable that the number of drying chambers is an odd number such as five or seven chambers, and the central drying chamber has the highest degree of decompression. Furthermore, in order to make it more precise, a method of increasing the pressure adjustment chamber may be taken. When rough drying is sufficient, only one drying chamber may be provided.

本発明の連続式減圧乾燥装置は、任意の用途における連続状のウェブに形成した液状の塗膜の乾燥に使用可能であるが、高速乾燥、高精度乾燥が可能であることから、エレクトロニクス製品分野、光学製品分野、ディスプレイ製品分野などの製造工程において、基材に塗膜を形成して乾燥する際の乾燥装置に用いることが好ましい。   The continuous vacuum drying apparatus of the present invention can be used for drying a liquid coating film formed on a continuous web in any application, but it can be dried at high speed and with high precision. In a manufacturing process such as an optical product field or a display product field, it is preferably used for a drying apparatus when a coating film is formed on a substrate and dried.

本発明の好適な実施の形態に係る連続式減圧乾燥装置の概略構成図1 is a schematic configuration diagram of a continuous vacuum drying apparatus according to a preferred embodiment of the present invention. 図１に示す乾燥装置におけるウェブ入口領域を示す概略断面図Schematic sectional view showing a web entrance region in the drying apparatus shown in FIG. 図１に示す乾燥装置のウェブ入口に設けているロールを拡大して示す概略断面図1 is an enlarged schematic cross-sectional view showing a roll provided at the web entrance of the drying apparatus shown in FIG.

符号の説明Explanation of symbols

１ 連続式減圧乾燥装置
２ ウェブ
３ 乾燥装置本体
３ａ 壁
４ ウェブ入口
５ ウェブ出口
７ 隔壁
８ 第一圧力調整室
９ 第一乾燥室
１０ 第二乾燥室
１１ 第三乾燥室
１２ 第二圧力調整室
１４ 吸引口
１５ 溶媒回収装置
１６ 減圧手段
１８ 給排気口
１９ 給排気手段
２１、２２ ロール
２４ 塗膜
２６ 溶媒噴射手段
２７ 配管
２８ ポンプ
２９ 不活性ガス供給手段
３１、３２ ロール
３５ ロール DESCRIPTION OF SYMBOLS 1 Continuous reduced pressure dryer 2 Web 3 Dryer main body 3a Wall 4 Web inlet 5 Web outlet 7 Partition 8 First pressure adjustment chamber 9 First drying chamber 10 Second drying chamber 11 Third drying chamber 12 Second pressure adjustment chamber 14 Suction port 15 Solvent recovery device 16 Pressure reducing means 18 Air supply / exhaust port 19 Air supply / exhaust means 21 and 22 rolls 24 Coating film 26 Solvent injection means 27 Piping 28 Pump 29 Inert gas supply means 31 and 32 rolls 35 rolls

Claims (9)

塗布により連続状のウェブの表面に形成した液状の塗膜を乾燥する方法であって、前記ウェブを連続的に、減圧状態に保持している空間内を通過させ、前記液状の塗膜に含まれている溶媒を蒸発させることを特徴とする連続式減圧乾燥方法。   A method of drying a liquid coating film formed on the surface of a continuous web by coating, wherein the web is continuously passed through a space maintained in a reduced pressure state and contained in the liquid coating film. A continuous vacuum drying method characterized by evaporating the solvent. 塗布により連続状のウェブの表面に形成した液状の塗膜を乾燥する装置であって、前記ウェブが水平に通り抜けることができるように配置されたウェブ入口及びウェブ出口を有し、該ウェブ入口とウェブ出口の間を走行中のウェブを取り囲む空間を形成する乾燥装置本体と、該乾燥装置本体内の、前記ウェブを取り囲む空間の少なくとも一部領域を減圧状態に保持するよう前記乾燥装置本体に接続された減圧手段と、前記乾燥装置本体を、前記ウェブが水平に且つ連続的に通過するように前記ウェブを案内する手段を有することを特徴とする連続式減圧乾燥装置。   An apparatus for drying a liquid coating film formed on the surface of a continuous web by coating, the web inlet having a web inlet and a web outlet arranged so that the web can pass horizontally, A drying device main body that forms a space that surrounds the running web between the web outlets, and at least a partial region of the space that surrounds the web in the drying device main body is connected to the drying device main body so as to maintain a reduced pressure state. And a means for guiding the web so that the web passes horizontally and continuously through the drying apparatus main body. 前記乾燥装置本体内が、隔壁によって、ウェブの走行方向に関して３個以上の乾燥室に分割されており、前記減圧手段が、前記乾燥室内の減圧度をウェブ入口から徐々に上げ、次いでウェブ出口側に向かい徐々に下げるように前記乾燥装置本体内を減圧する構成であることを特徴とする請求項２記載の連続式減圧乾燥装置。   The interior of the drying apparatus is divided into three or more drying chambers by a partition wall with respect to the running direction of the web, and the decompression means gradually increases the degree of decompression in the drying chamber from the web inlet, and then the web outlet side 3. The continuous vacuum drying apparatus according to claim 2, wherein the inside of the drying apparatus main body is depressurized so as to be gradually lowered toward the bottom. 前記乾燥装置本体内のウェブ入口に隣接した領域及びウェブ出口に隣接した領域のそれぞれに、隔壁によって、前記減圧手段に連結されて減圧されている領域から分離された圧力調整室が形成されていることを特徴とする請求項２又は３記載の連続式減圧乾燥装置。   In each of the region adjacent to the web inlet and the region adjacent to the web outlet in the drying apparatus main body, a pressure adjusting chamber is formed by a partition wall and separated from the pressure-reduced region connected to the pressure-reducing means. The continuous reduced-pressure drying apparatus according to claim 2 or 3, 前記乾燥装置本体のウェブ入口に乾燥装置本体内への外気の侵入を防ぐため、ウェブをはさむように２個のロールを設け、更に前記ウェブの液状の塗膜に接触する側のロールをウェブ走行方向とは逆方向に回転させ、該ロールの上流側のウェブ表面の塗膜を該ロールを通り抜けたウェブ表面に転写する構成としたことを特徴とする請求項２から４のいずれか１項記載の連続式減圧乾燥装置。   In order to prevent the outside air from entering the drying device main body at the web inlet of the drying device main body, two rolls are provided so as to sandwich the web, and the roll on the side of the web that contacts the liquid coating film is run on the web 5. The structure according to claim 2, wherein the film is rotated in a direction opposite to the direction, and the coating film on the web surface upstream of the roll is transferred to the web surface that has passed through the roll. Continuous vacuum drying equipment. 前記ウェブ入口に設けられている転写用のロールの表面に形成される塗膜の乾燥を防止するよう、前記ウェブ入口側の圧力調整室に溶媒蒸気を噴射する溶媒噴射手段を設けていることを特徴とする請求項５記載の連続式減圧乾燥装置。   In order to prevent drying of the coating film formed on the surface of the transfer roll provided at the web inlet, a solvent jetting means for jetting solvent vapor is provided in the pressure adjusting chamber on the web inlet side. 6. The continuous vacuum drying apparatus according to claim 5, wherein 前記乾燥装置本体内で蒸発した溶媒を回収し、その一部を前記溶媒噴射手段に供給する手段を有することを特徴とする請求項６記載の連続式減圧乾燥装置。   7. The continuous vacuum drying apparatus according to claim 6, further comprising means for collecting the solvent evaporated in the drying apparatus main body and supplying a part thereof to the solvent injection means. 前記ウェブ入口側の圧力調整室内が爆発下限界を越えないよう、該圧力調整室に不活性ガスを送り込む不活性ガス供給手段を設けていることを特徴とする請求項６又は７記載の連続式減圧乾燥装置。   The continuous type according to claim 6 or 7, further comprising an inert gas supply means for feeding an inert gas into the pressure regulation chamber so that the pressure regulation chamber on the web inlet side does not exceed a lower explosion limit. Vacuum drying equipment. 前記乾燥装置本体のウェブ出口に乾燥装置本体内への外気の侵入を防ぐため、ウェブをはさむように２個のロールを設けていることを特徴とする請求項２から８のいずれか１項記載の連続式減圧乾燥装置。   9. The roll according to claim 2, wherein two rolls are provided so as to sandwich the web in order to prevent the outside air from entering the drying apparatus main body at the web outlet of the drying apparatus main body. Continuous vacuum drying equipment.
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