JP4693982B2 - Coating method for coating equipment - Google Patents

Coating method for coating equipment Download PDF

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Publication number
JP4693982B2
JP4693982B2 JP2000388837A JP2000388837A JP4693982B2 JP 4693982 B2 JP4693982 B2 JP 4693982B2 JP 2000388837 A JP2000388837 A JP 2000388837A JP 2000388837 A JP2000388837 A JP 2000388837A JP 4693982 B2 JP4693982 B2 JP 4693982B2
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Prior art keywords
coating
coating liquid
cylinder
smooth cylinder
smooth
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JP2002186889A (en
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島 正 幸 長
藤 峰 明 衛
金 弘 之 白
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Dai Nippon Printing Co Ltd
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Dai Nippon Printing Co Ltd
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  • Coating Apparatus (AREA)
  • Inking, Control Or Cleaning Of Printing Machines (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)

Description

【０００１】
【発明の属する技術分野】
本発明は基材に塗工液を塗布する塗工装置に係り、とりわけ摩耗性が高く比較的低粘度の塗工液を確実に基材に塗布することができる塗工装置の塗工方法に関する。
【０００２】
【従来の技術】
従来より塗工装置として、塗工液が供給されるグラビア版胴と、グラビア版胴に対して基材を押付ける圧胴とを備えたものが知られている。基材がグラビア版胴と圧胴との間に供給されると、グラビア版胴上に供給された塗工液が基材側へ塗布される。
【０００３】
【発明が解決しようとする課題】
上述のようなグラビア版胴を有する塗工装置において、摩耗性が高くかつ比較的低粘度の塗工液を用いると、グラビア版胴の版が摩耗し、グラビアセルの容量が小さくなって塗工液の量が不足してしまうことがある。例えば、酸化チタン−アルコール系のインキでは１０時間程度の運転でグラビアセルの容量が２０〜３０％減少する。また製品の品目に応じて塗工液の膜厚を変えたい場合、塗工液の膜厚に応じてグラビア版胴を準備する必要がある。
【０００４】
本発明はこのような点を考慮してなされたものであり、摩耗性が高く比較的低粘度の塗工液でも精度良く基材へ塗布することができ、かつ長時間の使用に耐えることができるとともに、製品の品目毎に版胴の変換が不要となる塗工装置を提供することを目的とする。
【０００５】
【課題を解決するための手段】
本発明は、表面が平滑に形成され、塗工液が供給される平滑胴と、平滑胴に対して基材を押付けて塗工液を塗布し塗膜を形成する圧胴と、平滑胴上の塗工液を掻取るドクタ装置を備え、ドクタ装置は、平滑胴側へ延びる複数の掻取突部を有するブロック状ドクタ装置本体からなり、掻取突部は互いの間に溝部を形成するとともに、各掻取突部の平滑胴側先端面は、平滑胴の外周面に対応する内周面を有することを特徴とする塗工装置である。
【０００６】
本発明によれば、版胴と圧胴との間に基材が供給されるとともに、平滑胴上に塗工液が供給される。平滑胴上の塗工液は、ブロック状ドクタ装置本体の複数の掻取突部により掻き取られ、掻取板間の溝部を通過した塗工液が平滑胴上にすじ状に残る。その後平滑胴上の塗工液は合流し、その膜厚が調整される。平滑胴上の塗工液は基材側へ塗布される。平滑胴上の塗工液を、平滑胴の外周面に対応する円周面を有する掻取突部によりスムーズに掻き取ることができる。
【０００７】
【発明の実施の形態】
以下、図面を参照して本発明の実施の形態について説明する。
図１および図２は本発明による塗工装置の一実施の形態を示す図である。
図１および図２に示すように、塗工装置１０は表面が平滑に形成された平滑胴１１と、平滑胴１１に対して基材１５を押付ける圧胴１２と、平滑胴１１上の塗工液１８を掻取るドクタ装置２０とを備えている。
【０００８】
また平滑胴１１の下方には、塗工液１８を平滑胴１１側へ供給するインキ供給ロール１３が配置されている。インキ供給ロール１３から供給される塗工液としては、例えば酸化チタン−アルコール系の塗工液１８のように、摩耗性の高くかつ比較的低粘度の塗工液が考えられる。
【０００９】
また、ドクタ装置２０は、図２に示すように、ブロック状ドクタ装置本体２０ａからなり、ドクタ装置本体２０ａには平滑胴１１側に延びる複数の掻取突部２１が形成されている。
【００１０】
複数の掻取突部２１は、互いの間に溝部２３を形成するとともに、各掻取突部２１は平滑胴１１の円周方向に延びている。
【００１１】
各掻取突部２１は平滑胴１１との間でスムーズに塗工液１８を掻き取ることができるよう、平滑胴１１の外周面に対応する内周面２１ａを有している。各掻取突部２１の円周方向長さは５〜３０ｍｍとなっており、各掻取突部２１の円周面２１ａに対応する平滑胴１１の円周角Ａは、３〜１４°となっている。
【００１２】
また、ドクタ装置本体２０ａは、平滑胴１１の軸線方向に沿って往復自在となっており、またドラック装置本体２１ａの平滑胴１１の回転方向下流端には、調整板２２が平滑胴１１側へ進退自在に設けられている。この調整板２２は掻取突部２１間に形成された溝部高さを調整するものである。
【００１３】
次にこのような構成からなる本実施の形態の作用について説明する。
【００１４】
まず基材（例えばフィルム）１５が平滑胴１１と圧胴１２との間に供給され、同時にインキ供給ロール１３から平滑胴１１へ塗工液１８が供給される。
【００１５】
次に平滑胴１１上の塗工液１８は、ドクタ装置２０の各掻取突部２１により掻き取られる。このため平滑胴１１上には、掻取突部２１間の溝部２３を通過した塗工液１８のみがすじ状に残る。
【００１６】
その後、平滑胴１１上のすじ状の塗工液１８は、互いに合流し、膜厚が均一化された後、基材１５へ塗布され、塗膜１６を形成する。この間、ドクタ装置２０のドクタ装置本体２０ａを平滑胴１１の軸線方向に沿って往復させることにより、平滑胴１１上の塗工液１８の膜厚をより均一化させることができる。
【００１７】
塗工装置１０を長時間使用すると、掻取突部２１の先端が塗工液１８により摩耗し、溝部２３の高さが変化し、これにより基材１５上の塗膜１６の膜厚も変化することが考えられる。
【００１８】
この場合は、調整板２２を移動させることにより、溝部２３の高さを調整することにより、平滑胴１１上の塗工液１８の量を一定に保つことができ、これによって基材１５の塗膜１６の膜厚を一定に維持することができる。
【００１９】
なお、円周面２１ａを有する掻取突部２１は、通常の炭素鋼板状ドクタよりその摩耗速度が小さくなっている。例えば通常の炭素鋼板状ドクタの摩耗速度が２mm／ｈの場合、ブロック状ドクタ装置本体２０ａの掻取突部２１の摩耗速度は、その1／10〜1／300程度となる。
【００２０】
以上のように本実施の形態によれば、基材１５上の塗膜１６の膜厚を一定に保つことができる。また掻取突部２１は平滑胴１１の外周面に対応する内周面２１ａを有するため、塗工液１８をスムーズに掻き取ることができ、掻取突部２１および平滑胴１１の負担を小さくすることができる。
【００２１】
また製品の品目を変える場合も、平滑胴１１を代えることなく、ドクタ装置２０を交替するだけで品目の変更に対応することができる。
【００２２】
さらに平滑胴１１の変換頻度を抑えることができるので、変換に伴なう洗浄作業も減少させることができる。
【００２３】
【発明の効果】
以上のように本発明によれば、平滑胴上に供給された塗工液をドクタ装置の掻取突部により掻取って、平滑胴上の塗工液の膜厚を調整することができる。また平滑胴上の塗工液を掻取突部によりスムーズに掻き取ることができ、掻取突部および平滑胴の負担を小さくすることができる。さらにグラビア版胴の代わりに平滑胴を用いるため、摩耗によりグラビア版胴を変換する必要はなく、作業性が向上する。
【図面の簡単な説明】
【図１】本発明による塗工装置の一実施の形態を示す概略図
【図２】平滑胴とドクタ装置を示す拡大図
【符号の説明】
１０ 塗工装置
１１ 平滑胴
１２ 圧胴
１３ インキ供給ロール
１５ 基材
１６ 塗膜
２０ ドクタ装置
２０ａ ドクタ装置本体
２１ 掻取突部
２１ａ 内周面
２２ 調整板
２３ 溝部[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a coating apparatus for applying a coating liquid to a substrate, and more particularly to a coating method for a coating apparatus that can reliably apply a coating liquid with high wear resistance and a relatively low viscosity to a substrate. .
[0002]
[Prior art]
2. Description of the Related Art Conventionally, a coating apparatus that includes a gravure plate cylinder to which a coating liquid is supplied and an impression cylinder that presses a substrate against the gravure plate cylinder is known. When the substrate is supplied between the gravure plate cylinder and the impression cylinder, the coating liquid supplied onto the gravure plate cylinder is applied to the substrate side.
[0003]
[Problems to be solved by the invention]
In a coating apparatus having a gravure plate cylinder as described above, if a coating solution with high wear resistance and relatively low viscosity is used, the plate of the gravure plate cylinder is worn and the capacity of the gravure cell is reduced. The amount of liquid may be insufficient. For example, with a titanium oxide-alcohol-based ink, the gravure cell capacity is reduced by 20 to 30% after about 10 hours of operation. When it is desired to change the film thickness of the coating liquid according to the product item, it is necessary to prepare a gravure plate cylinder according to the film thickness of the coating liquid.
[0004]
The present invention has been made in consideration of such points, and can be applied to a substrate with high accuracy even with a coating solution having high wear resistance and a relatively low viscosity, and can withstand long-term use. Another object of the present invention is to provide a coating apparatus that can change the plate cylinder for each product item.
[0005]
[Means for Solving the Problems]
The present invention includes a smooth cylinder having a smooth surface and a coating liquid supplied thereto, a pressure cylinder that presses a substrate against the smooth cylinder to apply a coating liquid to form a coating film, and a smooth cylinder The doctor device comprises a block doctor device body having a plurality of scraping protrusions extending toward the smooth cylinder, and the scraping protrusions form a groove between them. In addition, the smooth cylinder side tip surface of each scraping projection has an inner peripheral surface corresponding to the outer peripheral surface of the smooth cylinder.
[0006]
According to the present invention, the base material is supplied between the plate cylinder and the impression cylinder, and the coating liquid is supplied onto the smooth cylinder. The coating liquid on the smooth cylinder is scraped off by a plurality of scraping protrusions of the block doctor body, and the coating liquid that has passed through the groove between the scraping plates remains on the smooth cylinder in a streak shape. Thereafter, the coating liquids on the smooth cylinder merge and the film thickness is adjusted. The coating liquid on the smooth cylinder is applied to the substrate side. The coating liquid on the smooth cylinder can be smoothly scraped off by the scraping protrusion having a circumferential surface corresponding to the outer peripheral surface of the smooth cylinder.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings.
1 and 2 are diagrams showing an embodiment of a coating apparatus according to the present invention.
As shown in FIGS. 1 and 2, the coating apparatus 10 includes a smooth cylinder 11 having a smooth surface, an impression cylinder 12 that presses a base material 15 against the smooth cylinder 11, and a coating on the smooth cylinder 11. And a doctor device 20 for scraping the working liquid 18.
[0008]
An ink supply roll 13 that supplies the coating liquid 18 to the smooth cylinder 11 side is disposed below the smooth cylinder 11. As the coating liquid supplied from the ink supply roll 13, for example, a coating liquid having high wear resistance and relatively low viscosity, such as a titanium oxide-alcohol-based coating liquid 18, can be considered.
[0009]
As shown in FIG. 2, the doctor device 20 includes a block-shaped doctor device main body 20a, and a plurality of scraping protrusions 21 extending toward the smooth cylinder 11 are formed on the doctor device main body 20a.
[0010]
The plurality of scraping protrusions 21 form a groove 23 therebetween, and each scraping protrusion 21 extends in the circumferential direction of the smooth cylinder 11.
[0011]
Each scraping protrusion 21 has an inner peripheral surface 21 a corresponding to the outer peripheral surface of the smooth cylinder 11 so that the coating liquid 18 can be smoothly scraped between the scraping protrusions 21. The circumferential length of each scraping projection 21 is 5 to 30 mm, and the circumferential angle A of the smooth cylinder 11 corresponding to the circumferential surface 21a of each scraping projection 21 is 3 to 14 °. It has become.
[0012]
The doctor device main body 20a can reciprocate along the axial direction of the smoothing cylinder 11, and an adjusting plate 22 is provided at the downstream end in the rotation direction of the smoothing cylinder 11 of the drag device main body 21a toward the smoothing cylinder 11. It is provided to freely advance and retreat. The adjusting plate 22 adjusts the height of the groove formed between the scraping protrusions 21.
[0013]
Next, the operation of the present embodiment having such a configuration will be described.
[0014]
First, the base material (for example, film) 15 is supplied between the smooth cylinder 11 and the impression cylinder 12, and at the same time, the coating liquid 18 is supplied from the ink supply roll 13 to the smooth cylinder 11.
[0015]
Next, the coating liquid 18 on the smooth cylinder 11 is scraped off by the scraping protrusions 21 of the doctor device 20. Therefore, only the coating liquid 18 that has passed through the groove 23 between the scraping protrusions 21 remains on the smooth cylinder 11 in a streak shape.
[0016]
Thereafter, the stripe-shaped coating liquid 18 on the smooth cylinder 11 joins each other, and after the film thickness is made uniform, it is applied to the substrate 15 to form the coating film 16. During this time, by reciprocating the doctor device body 20a of the doctor device 20 along the axial direction of the smooth cylinder 11, the film thickness of the coating liquid 18 on the smooth cylinder 11 can be made more uniform.
[0017]
When the coating apparatus 10 is used for a long time, the tip of the scraping protrusion 21 is worn by the coating liquid 18, and the height of the groove 23 is changed, thereby changing the film thickness of the coating film 16 on the substrate 15. It is possible to do.
[0018]
In this case, the amount of the coating liquid 18 on the smooth cylinder 11 can be kept constant by adjusting the height of the groove portion 23 by moving the adjustment plate 22, whereby the coating of the base material 15 can be maintained. The film thickness of the film 16 can be kept constant.
[0019]
The scraping protrusion 21 having the circumferential surface 21a has a lower wear rate than a normal carbon steel sheet doctor. For example, when the wear rate of a normal carbon steel sheet doctor is 2 mm / h, the wear rate of the scraping protrusion 21 of the block doctor apparatus main body 20a is about 1/10 to 1/300.
[0020]
As described above, according to the present embodiment, the film thickness of the coating film 16 on the substrate 15 can be kept constant. Further, since the scraping projection 21 has an inner peripheral surface 21 a corresponding to the outer peripheral surface of the smooth cylinder 11, the coating liquid 18 can be scraped smoothly, and the burden on the scraping projection 21 and the smooth cylinder 11 is reduced. can do.
[0021]
Moreover, when changing the item of a product, it can respond to a change of an item only by changing the doctor apparatus 20, without changing the smooth cylinder 11. FIG.
[0022]
Furthermore, since the conversion frequency of the smooth cylinder 11 can be suppressed, the cleaning work accompanying the conversion can also be reduced.
[0023]
【The invention's effect】
As described above, according to the present invention, it is possible to adjust the film thickness of the coating liquid on the smooth cylinder by scraping the coating liquid supplied onto the smooth cylinder with the scraping protrusion of the doctor device. Moreover, the coating liquid on the smooth cylinder can be smoothly scraped off by the scraping protrusion, and the burden on the scraping protrusion and the smooth cylinder can be reduced. Furthermore, since a smooth cylinder is used instead of the gravure plate cylinder, it is not necessary to convert the gravure plate cylinder due to wear, and workability is improved.
[Brief description of the drawings]
FIG. 1 is a schematic view showing an embodiment of a coating apparatus according to the present invention. FIG. 2 is an enlarged view showing a smoothing cylinder and a doctor device.
DESCRIPTION OF SYMBOLS 10 Coating apparatus 11 Smooth cylinder 12 Pressure cylinder 13 Ink supply roll 15 Base material 16 Coating film 20 Doctor apparatus 20a Doctor apparatus main body 21 Scraping protrusion 21a Inner peripheral surface 22 Adjustment plate 23 Groove part

Claims (1)

表面が平滑に形成され、塗工液が供給される平滑胴と、
平滑胴に対して基材を押付けて塗工液を塗布し塗膜を形成する圧胴と、
平滑胴上の塗工液を掻取るドクタ装置を備え、
ドクタ装置は、平滑胴側へ延びる複数の掻取突部を有するブロック状ドクタ装置本体からなり、
掻取突部は互いの間に溝部を形成するとともに、各掻取突部の平滑胴側先端面は、平滑胴の外周面に対応する内周面を有し、
ドクタ装置本体は平滑胴の軸線方向に往復自在となっており、
ブロック状ドクタ装置本体に、掻取突部間の溝部の高さを調整する調整板を移動自在に設けた塗工装置の塗工方法において、
酸化チタン−アルコール系の塗工液を平滑胴上に供給する工程と、
平滑胴上の塗工液をドクタ装置によって掻取り、ドクタ装置の溝部を通過した複数のすじ状の塗工液を平滑胴上に形成する工程と、
すじ状の塗工液を合流させ膜厚が均一化された塗工液とした後、基材上へ塗工液を塗布して塗膜を形成する工程と、を備えたことを特徴とする塗工装置の塗工方法。 A smooth cylinder to which a surface is smoothly formed and a coating liquid is supplied;
An impression cylinder that presses a substrate against a smooth cylinder to apply a coating liquid to form a coating film;
Equipped with a doctor device that scrapes the coating liquid on the smooth cylinder,
The doctor device consists of a block doctor device main body having a plurality of scraping protrusions extending toward the smooth body side,
With scraping protrusions form a groove between each other, the smooth Dogawa distal end surface of the scraping protrusions may have a inner peripheral surface corresponding to the outer peripheral surface of the smooth cylinder,
The doctor device body can reciprocate in the axial direction of the smooth cylinder,
In the coating method of the coating apparatus in which the adjustment plate for adjusting the height of the groove portion between the scraping protrusions is movably provided in the block doctor device main body,
Supplying a titanium oxide-alcohol-based coating solution onto a smooth cylinder;
Scraping the coating liquid on the smooth cylinder with a doctor device and forming a plurality of streaky coating liquids that have passed through the groove of the doctor apparatus on the smooth cylinder;
And a step of forming a coating film by applying the coating liquid onto a substrate after the stripe-shaped coating liquid is merged to form a coating liquid having a uniform film thickness. Coating method for coating equipment.
JP2000388837A 2000-12-21 2000-12-21 Coating method for coating equipment Expired - Fee Related JP4693982B2 (en)

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JP4693982B2 true JP4693982B2 (en) 2011-06-01

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5561481U (en) * 1978-10-20 1980-04-26
JPS6049963U (en) * 1983-09-10 1985-04-08 パイオニア株式会社 Doctor for roll coater

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0829280B2 (en) * 1987-08-17 1996-03-27 三井石油化学工業株式会社 Liquid coating method and apparatus

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5561481U (en) * 1978-10-20 1980-04-26
JPS6049963U (en) * 1983-09-10 1985-04-08 パイオニア株式会社 Doctor for roll coater

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