JP4705712B2 - Coating liquid application equipment - Google Patents

Coating liquid application equipment Download PDF

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Publication number
JP4705712B2
JP4705712B2 JP2000245811A JP2000245811A JP4705712B2 JP 4705712 B2 JP4705712 B2 JP 4705712B2 JP 2000245811 A JP2000245811 A JP 2000245811A JP 2000245811 A JP2000245811 A JP 2000245811A JP 4705712 B2 JP4705712 B2 JP 4705712B2
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coating liquid
coating
roll
chamber
peripheral surface
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JP2002059052A (en
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保昌 富永
孝洋 水野
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Fuji Kikai Kogyo Co Ltd
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Fuji Kikai Kogyo Co Ltd
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Description

【０００１】
【発明の属する技術分野】
本発明は、塗工液が充填されるキャビティが周面に形成されたグラビア塗布ロールを使用して樹脂フィルムまたは紙等からなるシート材の表面に塗工液を塗布する塗工液の塗布装置に関するものである。
【０００２】
【従来の技術】
従来、例えば特開２０００−８４４５３号公報に示されるように、シート材の表面に塗工液を塗布する塗布ロールと、その周面に沿って設置された密閉型のチャンバと、このチャンバに塗工液を供給する塗工液供給手段とを備え、上記チャンバにより塗布ロール（版胴）に供給された塗工液を上記シート材に転写して塗布することが行われている。
【０００３】
【発明が解決しようとする課題】
上記のように密閉型のチャンバを使用して塗布ロールに塗工液を供給するように構成した場合には、上記塗工液が周囲に飛散することに起因した環境の悪化を生じることなく、上記シート材に対して塗工液を効率よく塗布することができるという利点がある。しかし、上記塗布ロールの周面にチャンバから塗工液を供給する際に、気泡が混入されることを完全には防止することができず、この気泡が上記塗工液とともにシート材に転写されて、この塗工液層にピンホールが生成されることが避けられない。特に、水溶性の塗工液を使用した場合には、塗工液中に気泡が発生し易いために、上記シート材に塗布された塗工液層にピンホールが生成され易いという問題がある。
【０００４】
上記シート材に塗布された塗工液層にピンホールが生成されると、塗布面の外観が悪化して品質が低下するとともに、この塗布面がバリヤー性（気密性）を必要とする場合に、このバリヤー性を維持することができなくなる。このため、上記塗布ロールの回転速度を低下させて塗布ロールに対する塗工液の接触時間を長くすることにより、上記塗布ロールの周面に気泡を有する塗工液層が形成されるのを防ぐことが行われているが、このように構成した場合には、上記塗工液の塗布速度が遅くなるという問題があった。
【０００５】
本発明は、上記の点に鑑みてなされたものであり、塗工液の塗布速度を遅くすることなく、シート材に塗布された塗工液層にピンホールが生成されるのを効果的に防止して高品質の塗布面を形成することができる塗工液の塗布装置を提供することを目的としている。
【０００６】
【課題を解決するための手段】
請求項１に係る発明は、シート材の表面に塗布される塗工液が充填されるキャビティが周面に形成されたグラビア塗布ロールと、このグラビア塗布ロールの周面に沿ってその回転方向の上流側および下流側に設置された第１，第２塗工液チャンバと、各塗工液チャンバに塗工液を供給する塗工液供給手段とを備え、上記各塗工液チャンバに、塗布ロールの周面の一部に対向する塗工液溜まりを形成し、かつその回転方向の上流側部をシールするシール部材を設けるとともに、その下流側部に上記塗布ロールに付着した余分な塗工液を除去するドクター刃を設けることにより、上記各塗工液チャンバの内部を密閉状態とし、かつ上記塗布ロールの回転方向上流側に配設された第１塗工液チャンバから塗布ロールに塗工液を密閉状態で供給した後、この塗布ロール上の塗工液を、上記塗布ロールの回転方向下流側に配設された第２塗工液チャンバから供給された塗工液と密閉状態で置換するように構成したものである。
【０００７】
上記構成によれば、塗布ロールの回転方向上流側に配設された第１塗工液チャンバから塗布ロールの周面に塗工液が供給される際に、この塗工液に気泡が混入された場合においても、この塗工液が、塗布ロールの回転方向下流側に配設された第２塗工液チャンバから供給された塗工液と置換されることにより、上記塗布ロールの周面に気泡のない塗工液層が形成され、この塗工液層がシート材に転写されて塗布されることになる。
【０００８】
【発明の実施の形態】
図１および図２は、本発明に係る塗工液の塗布装置の実施形態を示している。この塗布装置は、シート材１の表面に接触して塗工液を塗布する塗布ロール２と、この塗布ロール２の周面に上記シート材１の表面を圧接させる圧胴３と、上記塗布ロール２の周面に沿って相対向して設置された第１，第２塗工液チャンバ４，５と、この第１塗工液チャンバ４に塗工液を供給する第１塗工液供給手段６と、上記第２塗工液チャンバ５に塗工液を供給する第２塗工液供給手段７とを備えている。
【０００９】
上記塗布ロール２は、シート材の表面に塗布される塗工液が充填されるキャビティが周面に形成されたグラビア塗布ロールからなり、図の反時計方向に駆動されることにより、シート材１の搬送方向に沿って回転するように構成されている。上記塗工液チャンバ４，５は、図２に示すように、それぞれ上記塗布ロール２の周面に対向するように開口した空間部からなる塗工液溜まり８が形成されたチャンバ本体９を有している。
【００１０】
上記両塗工液チャンバ４，５のうち、塗布ロール２の回転方向上流側に位置する第１塗工液チャンバ４のチャンバ本体９の前面下端部、つまり上記塗布ロール２の回転方向の下流側部には、ステンレス鋼板等からなるドクター刃１０が、チャンバ本体９の長さ方向に延びる固定部材１１により固定されている。また、上記チャンバ本体９の前面上端部、つまり上記塗布ロール２の回転方向の上流側部には、鋼板材またはプラスチック板等からなるシールプレート１２が、チャンバ本体９の長さ方向に延びる固定部材１３により固定されている。
【００１１】
また、上記塗布ロール２の回転方向下流側に位置する第２塗工液チャンバ５のチャンバ本体９の前面上端部、つまり上記塗布ロール２の回転方向の下流側部には、ステンレス鋼板等からなるドクター刃１０が、チャンバ本体９の長さ方向に延びる固定部材１１により固定されている。また、上記チャンバ本体９の前面下端部、つまり上記塗布ロール２の回転方向の上流側部には、鋼板材またはプラスチック板等からなるシールプレート１２が、チャンバ本体９の長さ方向に延びる固定部材１３により固定されている。
【００１２】
そして、上記ドクター刃１０およびシールプレート１２の先端部が、上記塗布ロール２の周面に圧接されることにより、上記塗工液溜まり８の前面部上下が上記ドクター刃１０およびシールプレート１２によりシールされて上記塗工液溜まり８が密閉状態となるように構成されるとともに、上記塗布ロール２が回転に応じて、その周面に付着した余分な塗工液が上記ドクター刃１０により掻き取られるように構成されている。
【００１３】
上記第１，第２塗工液供給手段６，７は、それぞれ印刷用のインキ等からなる塗工液が収容された元タンク１４と、この元タンク１４内の塗工液を吸引して上記チャンバ本体９の下部に給送する第１給送ポンプ１５を備えた塗工液供給パイプ１６と、上記チャンバ本体９の上部から排出された塗工液溜まり８内の塗工液を上記元タンク１４に戻すリターンパイプ１８とを備えている（図１参照）。
【００１４】
上記構成において第１，第２塗工液供給手段６，７の第１給送ポンプ１５を作動させることにより、元タンク１４内に収容された塗工液を、上記第１，第２塗工液チャンバ４，５の塗工液溜まり８内にそれぞれ供給しつつ、上記塗布ロール２を回転駆動する。この結果、上記第１塗工液チャンバ４に設けられた塗工液溜まり８内の塗工液が塗布ロール２の周面に接触して密閉状態で供給されるとともに、この塗布ロール２の周面に付着した余分な塗工液が上記ドクター刃１０によって除去された後、上記塗布ロール２の回転に応じて第２塗工液チャンバ５の設置部に搬送される。
【００１５】
そして、上記第１塗工液チャンバ４から塗布ロール２の周面に供給された塗工液が、上記第２塗工液チャンバ５から密閉状態で供給された塗工液と置換されるとともに、塗布ロール２の周面に付着した余分な塗工液が上記ドクター刃１０によって除去された後、上記第２塗工液チャンバ５から塗布ロール２の周面に供給された塗工液が、上記シート材１と塗布ロール２との当接部において、このシート材１の表面に転写されて塗布される。
【００１６】
上記のように塗布ロール２の周面に沿って上記塗工液溜まり８とドクター刃１０とを有する第１，第２塗工液チャンバ４，５を設置し、第１，第２塗工液供給手段６，７から上記第１，第２塗工液チャンバ４，５にそれぞれ塗工液を供給することにより、上記塗布ロール２の回転方向上流側に配設された第１塗工液チャンバ４から塗布ロール２に塗工液を密閉状態で供給した後、この塗布ロール２上の塗工液を、上記塗布ロール２の回転方向下流側に配設された第２塗工液チャンバ５から供給された塗工液と密閉状態で置換するように構成したため、塗工液の塗布速度を遅くすることなく、上記シート材１の表面に塗布された塗工液層にピンホールが生成されるのを効果的に防止して高品質の塗布面を形成することができる。
【００１７】
すなわち、上記塗布ロール２の周面には、塗工液が充填されるキャビティが形成され、このキャビティ内に充填された塗工液が上記塗布部においてシート材１に転写されることにより、上記キャビティに所定の空隙が形成されるとともに、この空隙内に多量の空気が充填された状態で、上記第１塗工液チャンバ４の設置部に搬送されるため、この第１塗工液チャンバ４から上記キャビティ内に塗工液を密閉状態で供給した場合においても、この塗工液中に上記空気が巻き込まれて気泡が発生する。しかし、上記塗工液によって塗布ロール２のキャビティが覆われた状態で、第２塗工液チャンバ５の設置部に搬送されるため、この第２塗工液チャンバ５から密閉状態で供給された塗工液と、上記キャビティ内の塗工液とが置換される際に空気が巻き込まれることはなく、上記塗布ロール２の周面に気泡のない塗工液層が形成されることになる。
【００１８】
したがって、上記シート材１の搬送速度を２００ｍ／分程度の高速に設定し、かつ気泡の発生し易い水溶性の塗工液を使用した場合においても、上記塗布ロール２からシート材１の表面に転写された塗工液層にピンホールが生成されるのを効果的に防止することができ、塗布ムラのない高品質の塗布面を迅速に形成することができるとともに、塗工液の塗布面にバリヤー性が必要とされる場合に、これを確保することができるという利点がある。
【００１９】
また、上記実施形態では、塗布ロール２の回転方向上流側に配設された第１塗工液チャンバ４に塗工液を供給する第１塗工液供給手段６と、上記塗布ロール２の回転方向下流側に配設された第２塗工液チャンバ５に塗工液を供給する第２塗工液供給手段７とを、それぞれ独立して形成したため、上記シート材１に対する塗工液の塗布部において塗布ロール２の周面に付着したゴミ等が上記第２塗工液チャンバ５内に混入すること等を効果的に防止し、上記第２塗工液供給手段７を介して第２塗工液チャンバ５に供給される塗工液を、常に清浄な状態に維持できるという利点がある。
【００２０】
なお、上記実施形態では、塗布ロール２がシート材１の搬送方向に沿って回転するナチュラルタイプのグラビア印刷機またはコーティング機に本発明を適用した例について説明したが、上記塗布ロール２がシート材１の搬送方向と逆方向に回転するリバースタイプのグラビア印刷機等についても、本発明に係る塗工液の塗布装置を適用可能である。また、上記塗布ロールの回転方向上流側に配設された第１塗工液チャンバと塗布ロールの回転方向下流側に配設された第２塗工液チャンバとを備えた構造において、上記塗工液チャンバ４，５の個数は、二個に限られず、三個以上であってもよい。
【００２１】
【発明の効果】
以上説明したように、本発明は、シート材の表面に塗布される塗工液が充填されるキャビティが周面に形成されたグラビア塗布ロールと、このグラビア塗布ロールの周面に沿ってその回転方向の上流側および下流側に設置された第１，第２塗工液チャンバと、各塗工液チャンバに塗工液を供給する塗工液供給手段とを備え、上記各塗工液チャンバに、塗布ロールの周面の一部に対向する塗工液溜まりを形成し、かつその回転方向の上流側部をシールするシール部材を設けるとともに、その下流側部に上記塗布ロールに付着した余分な塗工液を除去するドクター刃を設けることにより、上記各塗工液チャンバの内部を密閉状態とし、かつ上記塗布ロールの回転方向上流側に配設された第１塗工液チャンバから塗布ロールに塗工液を密閉状態で供給した後、この塗布ロール上の塗工液を、上記塗布ロールの回転方向下流側に配設された第２塗工液チャンバから供給された塗工液と密閉状態で置換するように構成したため、上記塗布ロールの回転方向上流側に設置された第１塗工液チャンバから塗布ロールの周面に供給された塗工液中に気泡が混入されたとしても、この気泡を有する塗工液を、上記塗布ロールの回転方向下流側に設置された第２塗工液チャンバから密閉状態で供給された塗工液と置換することにより、塗布ロールの周面に気泡のない塗工液層を形成することができる。
【００２２】
したがって、気泡の発生し易い水溶性の塗工液を使用した場合でも、その塗布速度を遅くする等の手段を講じることなく、上記シート材に塗布された塗工液層にピンホールが生成されるのを効果的に防止し、塗布ムラのない高品質の塗布面を迅速に形成できるとともに、塗工液の塗布面にバリヤー性が必要とされる場合に、これを適正に確保できるという利点がある。
【図面の簡単な説明】
【図１】 本発明に係る塗工液の塗布装置の実施形態を示す説明図である。
【図２】 塗工液チャンバの具体的構成を示す側面前面図である。
【符号の説明】
１ シート材
２ 塗布ロール
４ 第１塗工液チャンバ
５ 第２塗工液チャンバ
６，７ 塗工液供給手段
８ 塗工液溜まり
１０ ドクター刃[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a coating liquid coating apparatus for coating a coating liquid on the surface of a sheet material made of a resin film or paper or the like using a gravure coating roll having a cavity filled with the coating liquid formed on the peripheral surface. It is about.
[0002]
[Prior art]
Conventionally, as disclosed in, for example, Japanese Patent Application Laid-Open No. 2000-84453, a coating roll for coating a coating liquid on the surface of a sheet material, a sealed chamber installed along the peripheral surface, and a coating applied to the chamber. Coating liquid supply means for supplying a working liquid is provided, and the coating liquid supplied to the coating roll (plate cylinder) by the chamber is transferred to the sheet material and applied.
[0003]
[Problems to be solved by the invention]
When configured to supply the coating liquid to the coating roll using a sealed chamber as described above, without causing deterioration of the environment due to the coating liquid scattering around, There is an advantage that the coating liquid can be efficiently applied to the sheet material. However, when supplying the coating liquid from the chamber to the peripheral surface of the coating roll, it is not possible to completely prevent bubbles from being mixed, and the bubbles are transferred to the sheet material together with the coating liquid. Thus, it is inevitable that pinholes are generated in the coating liquid layer. In particular, when a water-soluble coating liquid is used, there is a problem that bubbles are easily generated in the coating liquid, so that pinholes are easily generated in the coating liquid layer applied to the sheet material. .
[0004]
When pinholes are generated in the coating liquid layer applied to the sheet material, the appearance of the coated surface deteriorates and the quality deteriorates, and the coated surface requires barrier properties (airtightness). This barrier property cannot be maintained. For this reason, by reducing the rotation speed of the coating roll and increasing the contact time of the coating liquid to the coating roll, it is possible to prevent the formation of a coating liquid layer having bubbles on the peripheral surface of the coating roll. However, in the case of such a configuration, there is a problem that the coating speed of the coating liquid becomes slow.
[0005]
The present invention has been made in view of the above points, and it is possible to effectively generate pinholes in the coating liquid layer applied to the sheet material without slowing down the coating speed of the coating liquid. An object of the present invention is to provide a coating liquid coating apparatus capable of preventing and forming a high-quality coated surface.
[0006]
[Means for Solving the Problems]
The invention according to claim 1 is a gravure coating roll in which a cavity filled with a coating liquid to be applied to the surface of a sheet material is formed on the peripheral surface, and the rotation direction along the peripheral surface of the gravure coating roll . The first and second coating liquid chambers installed on the upstream side and the downstream side, and coating liquid supply means for supplying the coating liquid to each coating liquid chamber, are applied to each coating liquid chamber. Forms a coating liquid reservoir facing a part of the peripheral surface of the roll and provides a seal member that seals the upstream side in the rotational direction, and the extra coating adhered to the coating roll on the downstream side By providing a doctor blade for removing the liquid, the inside of each coating liquid chamber is hermetically sealed , and the coating roll is coated from the first coating liquid chamber disposed upstream in the rotation direction of the coating roll. After supplying liquid in a sealed state The coating solution on the coating roll, which is constituted so as to replace in a closed state and the downstream side in the rotational direction supplied from the second coating solution chamber disposed in the coating solution of the coating roll.
[0007]
According to the above configuration, when the coating liquid is supplied to the peripheral surface of the coating roll from the first coating liquid chamber disposed on the upstream side in the rotation direction of the coating roll, bubbles are mixed into the coating liquid. In this case, the coating liquid is replaced with the coating liquid supplied from the second coating liquid chamber disposed on the downstream side in the rotation direction of the coating roll, so that the coating roll has a peripheral surface. A coating liquid layer without bubbles is formed, and this coating liquid layer is transferred to the sheet material and applied.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
1 and 2 show an embodiment of a coating liquid coating apparatus according to the present invention. The coating apparatus includes an application roll 2 that contacts the surface of the sheet material 1 and applies a coating liquid, a pressure drum 3 that presses the surface of the sheet material 1 against the peripheral surface of the application roll 2, and the application roll. First and second coating liquid chambers 4 and 5 installed opposite to each other along the peripheral surface of the first coating liquid chamber, and first coating liquid supply means for supplying the coating liquid to the first coating liquid chamber 4 6 and a second coating liquid supply means 7 for supplying the coating liquid to the second coating liquid chamber 5.
[0009]
The coating roll 2 is a gravure coating roll in which a cavity filled with a coating liquid to be coated on the surface of the sheet material is formed on the peripheral surface, and is driven in the counterclockwise direction in the drawing, whereby the sheet material 1 It is comprised so that it may rotate along the conveyance direction. As shown in FIG. 2, each of the coating liquid chambers 4 and 5 has a chamber main body 9 in which a coating liquid reservoir 8 formed of a space portion opened so as to face the peripheral surface of the coating roll 2 is formed. is doing.
[0010]
Of the two coating liquid chambers 4, 5, the lower end of the front surface of the chamber body 9 of the first coating liquid chamber 4 positioned upstream in the rotation direction of the coating roll 2, that is, the downstream side in the rotation direction of the coating roll 2. A doctor blade 10 made of a stainless steel plate or the like is fixed to the part by a fixing member 11 extending in the length direction of the chamber body 9. Further, a seal plate 12 made of a steel plate material or a plastic plate or the like is fixed to the upper end of the front surface of the chamber body 9, that is, the upstream side in the rotation direction of the coating roll 2, and extends in the length direction of the chamber body 9. 13 is fixed.
[0011]
Further, the upper end portion of the front surface of the chamber body 9 of the second coating liquid chamber 5 located on the downstream side in the rotation direction of the coating roll 2, that is, the downstream side portion in the rotation direction of the coating roll 2 is made of a stainless steel plate or the like. The doctor blade 10 is fixed by a fixing member 11 extending in the length direction of the chamber body 9. Further, a seal plate 12 made of a steel plate material or a plastic plate or the like is fixed to the lower end portion of the front surface of the chamber body 9, that is, the upstream side in the rotation direction of the coating roll 2, and extends in the length direction of the chamber body 9. 13 is fixed.
[0012]
And the front-end | tip part upper and lower sides of the said coating liquid reservoir 8 are sealed by the said doctor blade 10 and the sealing plate 12 when the front-end | tip part of the said doctor blade 10 and the sealing plate 12 is press-contacted to the surrounding surface of the said application roll 2. Thus, the coating liquid reservoir 8 is configured to be in a hermetically sealed state, and excess coating liquid adhering to the peripheral surface is scraped off by the doctor blade 10 as the coating roll 2 rotates. It is configured as follows.
[0013]
The first and second coating liquid supply means 6 and 7 respectively suck the coating liquid in the original tank 14 and the original tank 14 in which the coating liquid made of printing ink or the like is stored. A coating liquid supply pipe 16 having a first feed pump 15 for feeding to the lower part of the chamber body 9 and the coating liquid in the coating liquid reservoir 8 discharged from the upper part of the chamber body 9 are supplied to the original tank. And a return pipe 18 for returning to 14 (see FIG. 1).
[0014]
By operating the first feed pump 15 of the first and second coating liquid supply means 6 and 7 in the above configuration, the coating liquid stored in the original tank 14 is converted into the first and second coating liquids. The application roll 2 is rotationally driven while being supplied into the coating liquid reservoir 8 of the liquid chambers 4 and 5. As a result, the coating liquid in the coating liquid reservoir 8 provided in the first coating liquid chamber 4 contacts the peripheral surface of the coating roll 2 and is supplied in a sealed state. After excess coating liquid adhering to the surface is removed by the doctor blade 10, the coating liquid is transported to the installation section of the second coating liquid chamber 5 according to the rotation of the coating roll 2.
[0015]
The coating liquid supplied from the first coating liquid chamber 4 to the peripheral surface of the coating roll 2 is replaced with the coating liquid supplied from the second coating liquid chamber 5 in a sealed state, After the excess coating liquid adhering to the peripheral surface of the coating roll 2 is removed by the doctor blade 10, the coating liquid supplied from the second coating liquid chamber 5 to the peripheral surface of the coating roll 2 is At the contact portion between the sheet material 1 and the coating roll 2, it is transferred onto the surface of the sheet material 1 and applied.
[0016]
As described above, the first and second coating liquid chambers 4 and 5 having the coating liquid reservoir 8 and the doctor blade 10 are installed along the peripheral surface of the coating roll 2, and the first and second coating liquids are installed. The first coating liquid chamber disposed on the upstream side in the rotation direction of the coating roll 2 by supplying the coating liquid from the supply means 6 and 7 to the first and second coating liquid chambers 4 and 5, respectively. After the coating liquid is supplied from 4 to the coating roll 2 in a sealed state, the coating liquid on the coating roll 2 is supplied from the second coating liquid chamber 5 disposed downstream in the rotation direction of the coating roll 2. Since it is configured to replace the supplied coating liquid in a sealed state, pinholes are generated in the coating liquid layer applied to the surface of the sheet material 1 without slowing down the coating speed of the coating liquid. Can be effectively prevented to form a high-quality coated surface.
[0017]
That is, a cavity filled with the coating liquid is formed on the peripheral surface of the coating roll 2, and the coating liquid filled in the cavity is transferred to the sheet material 1 in the coating portion, thereby Since a predetermined gap is formed in the cavity and a large amount of air is filled in the gap, the first coating liquid chamber 4 is conveyed to the installation portion of the first coating liquid chamber 4. Even when the coating liquid is supplied in a sealed state from the above, the air is entrained in the coating liquid and bubbles are generated. However, in the state where the cavity of the coating roll 2 is covered with the coating liquid, since it is transported to the installation part of the second coating liquid chamber 5, it is supplied in a sealed state from the second coating liquid chamber 5. Air is not involved when the coating liquid and the coating liquid in the cavity are replaced, and a coating liquid layer without bubbles is formed on the peripheral surface of the coating roll 2.
[0018]
Therefore, even when the conveying speed of the sheet material 1 is set to a high speed of about 200 m / min and a water-soluble coating liquid that easily generates bubbles is used, the sheet material 1 is transferred from the coating roll 2 to the surface of the sheet material 1. It is possible to effectively prevent the generation of pinholes in the transferred coating liquid layer, and it is possible to quickly form a high quality coated surface without coating unevenness and to apply the coated liquid coating surface. There is an advantage that this can be ensured when barrier properties are required.
[0019]
Moreover, in the said embodiment, the 1st coating liquid supply means 6 which supplies a coating liquid to the 1st coating liquid chamber 4 arrange | positioned in the rotation direction upstream of the coating roll 2, and rotation of the said coating roll 2 are carried out. Since the second coating liquid supply means 7 for supplying the coating liquid to the second coating liquid chamber 5 disposed on the downstream side in the direction is formed independently of each other, the application of the coating liquid to the sheet material 1 is performed. This effectively prevents dust or the like adhering to the peripheral surface of the coating roll 2 from entering the second coating liquid chamber 5 in the part, and the second coating liquid supply means 7 is used to provide the second coating liquid. There is an advantage that the coating liquid supplied to the working liquid chamber 5 can always be maintained in a clean state.
[0020]
In addition, although the said embodiment demonstrated the example which applied this invention to the natural type gravure printing machine or coating machine in which the coating roll 2 rotates along the conveyance direction of the sheet material 1, the said coating roll 2 is a sheet material. The coating liquid coating apparatus according to the present invention can also be applied to a reverse type gravure printing machine or the like that rotates in the direction opposite to the conveyance direction 1. In the structure including the first coating liquid chamber disposed on the upstream side in the rotation direction of the coating roll and the second coating liquid chamber disposed on the downstream side in the rotation direction of the coating roll, The number of liquid chambers 4 and 5 is not limited to two, and may be three or more.
[0021]
【The invention's effect】
As described above, the present invention includes a gravure coating roll in which a cavity filled with a coating liquid to be applied to the surface of a sheet material is formed on the peripheral surface, and the rotation along the peripheral surface of the gravure coating roll. First and second coating liquid chambers installed upstream and downstream in the direction, and coating liquid supply means for supplying the coating liquid to the respective coating liquid chambers. And forming a coating liquid reservoir facing a part of the peripheral surface of the coating roll, and providing a seal member for sealing the upstream side in the rotational direction, and an extra portion attached to the coating roll on the downstream side By providing a doctor blade for removing the coating liquid, the inside of each coating liquid chamber is hermetically sealed , and the first coating liquid chamber disposed on the upstream side in the rotation direction of the coating roll is transferred from the first coating liquid chamber to the coating roll. Supply coating solution in a sealed state After, since the coating solution on the coating roll, and configured to replace a closed state and the supplied coating liquid from the second coating solution chamber disposed downstream in the rotation direction of the applicator roll Even if air bubbles are mixed in the coating liquid supplied to the peripheral surface of the coating roll from the first coating liquid chamber installed on the upstream side in the rotation direction of the coating roll, the coating liquid having the bubbles is removed. By replacing the coating liquid supplied in a sealed state from the second coating liquid chamber installed downstream in the rotation direction of the coating roll, a coating liquid layer without bubbles is formed on the peripheral surface of the coating roll. can do.
[0022]
Therefore, even when a water-soluble coating liquid that easily generates bubbles is used, pinholes are generated in the coating liquid layer applied to the sheet material without taking measures such as slowing the coating speed. It is possible to effectively form a high-quality coated surface with no coating unevenness and to ensure the appropriateness when barrier properties are required on the coated surface of the coating liquid. There is.
[Brief description of the drawings]
FIG. 1 is an explanatory view showing an embodiment of a coating liquid coating apparatus according to the present invention.
FIG. 2 is a side front view showing a specific configuration of a coating liquid chamber.
[Explanation of symbols]
1 Sheet material 2 Application roll
4 First coating liquid chamber
5 Second coating liquid chamber 6, 7 Coating liquid supply means 8 Coating liquid reservoir 10 Doctor blade

Claims (1)

シート材の表面に塗布される塗工液が充填されるキャビティが周面に形成されたグラビア塗布ロールと、このグラビア塗布ロールの周面に沿ってその回転方向の上流側および下流側に設置された第１，第２塗工液チャンバと、各塗工液チャンバに塗工液を供給する塗工液供給手段とを備え、上記各塗工液チャンバに、塗布ロールの周面の一部に対向する塗工液溜まりを形成し、かつその回転方向の上流側部をシールするシール部材を設けるとともに、その下流側部に上記塗布ロールに付着した余分な塗工液を除去するドクター刃を設けることにより、上記各塗工液チャンバの内部を密閉状態とし、かつ上記塗布ロールの回転方向上流側に配設された第１塗工液チャンバから塗布ロールに塗工液を密閉状態で供給した後、この塗布ロール上の塗工液を、上記塗布ロールの回転方向下流側に配設された第２塗工液チャンバから供給された塗工液と密閉状態で置換するように構成したことを特徴とする塗工液の塗布装置。
ことを特徴とする塗工液の塗布装置。A gravure coating roll in which a cavity filled with a coating liquid to be applied to the surface of the sheet material is formed on the peripheral surface, and installed on the upstream side and the downstream side in the rotation direction along the peripheral surface of the gravure coating roll. The first and second coating liquid chambers and a coating liquid supply means for supplying the coating liquid to each coating liquid chamber are provided on each of the coating roll chambers on a part of the peripheral surface of the coating roll. A seal member that forms the opposite coating liquid reservoir and seals the upstream side in the rotation direction is provided, and a doctor blade that removes excess coating liquid adhering to the coating roll is provided on the downstream side. Thus, after the inside of each coating liquid chamber is sealed and the coating liquid is supplied in a sealed state from the first coating liquid chamber disposed upstream in the rotation direction of the coating roll to the coating roll Coating on this coating roll Liquid and coating liquid application device, characterized by being configured to replace a closed state and the supplied coating liquid from the second coating solution chamber disposed downstream in the rotation direction of the applicator roll .
A coating liquid coating apparatus.
JP2000245811A 2000-08-14 2000-08-14 Coating liquid application equipment Expired - Fee Related JP4705712B2 (en)

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Publication number Priority date Publication date Assignee Title
JP4748768B2 (en) * 2004-02-12 2011-08-17 キヤノン株式会社 Inkjet recording device
JP5695698B2 (en) 2013-05-24 2015-04-08 富士機械工業株式会社 Gravure kiss coating equipment
JP6446233B2 (en) * 2014-10-27 2018-12-26 日東電工株式会社 Coating apparatus and coating method

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JPH073698A (en) * 1993-02-04 1995-01-06 J M Voith Gmbh Equipment and method of coating upper section of fibrous material web with color paint
JPH1067094A (en) * 1996-06-19 1998-03-10 Man Roland Druckmas Ag Packing device for recessed part of printing cylinder, blade device for packing into recessed part, and replacement of blade device
JPH1071703A (en) * 1996-08-30 1998-03-17 Toppan Printing Co Ltd Ink chamber and method for inking
JPH1142767A (en) * 1997-07-29 1999-02-16 Toppan Printing Co Ltd Ink chamber of gravure printing press
JP2000084453A (en) * 1998-09-14 2000-03-28 Fuji Kikai Kogyo Kk Apparatus for supplying coating liquid to plate cylinder
JP2000117944A (en) * 1998-10-15 2000-04-25 Ricoh Co Ltd Coating liquid supplying apparatus

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JP3442663B2 (en) * 1998-09-03 2003-09-02 富士機械工業株式会社 Applicator for applying coating liquid to sheet material

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH073698A (en) * 1993-02-04 1995-01-06 J M Voith Gmbh Equipment and method of coating upper section of fibrous material web with color paint
JPH1067094A (en) * 1996-06-19 1998-03-10 Man Roland Druckmas Ag Packing device for recessed part of printing cylinder, blade device for packing into recessed part, and replacement of blade device
JPH1071703A (en) * 1996-08-30 1998-03-17 Toppan Printing Co Ltd Ink chamber and method for inking
JPH1142767A (en) * 1997-07-29 1999-02-16 Toppan Printing Co Ltd Ink chamber of gravure printing press
JP2000084453A (en) * 1998-09-14 2000-03-28 Fuji Kikai Kogyo Kk Apparatus for supplying coating liquid to plate cylinder
JP2000117944A (en) * 1998-10-15 2000-04-25 Ricoh Co Ltd Coating liquid supplying apparatus

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