JPS61293569A - Coater nozzle for gravure coating device - Google Patents

Abstract

PURPOSE:To remarkably improve the performance of a coated film by providing a sub-gravure roll which is brought into rolling-contact with the return surface of a gravure roll and used for returning surplus paint to the nozzle opening to the opening part of a nozzle which is placed close to the coating surface of the gravure roll and used for supplying paint. CONSTITUTION:A sub-gravure roll 34 which is brought into rolling-contact with the return surface of a gravure roll 10 and used for returning surplus paint to the opening part of a nozzle 20 is provided at the opening part of the nozzle 20 which is placed close to the coating surface of the gravure roll 10 and used for supplying paint. Moreover, a paint supply vessel 30 furnished with the roll 34 at the opening part, a recovery vessel 40 equipped with a measuring means 55 at the opening part and used for receiving surplus paint and a release valve 52 provided to the partition wall 50 between both vessels and opened to the supply vessel 30 side are furnished to the nozzle 20. Consequently, the chances for the paint to be brought into contact with air are extremely reduced, the inclusion of bubbles is especially controlled, surplus paint is removed at every revolution of the roll 30, the paint to be coated on the coating surface of the roll 10 preceding the measuring means 51 and 55 is made uniform to enable high precision measurement and the performance of the coated film is remarkably improved.

Description

【発明の詳細な説明】 （イ）産業上の利用分野 本発明はグラビア塗布装置のコータノズルに関し、特（
：磁気テープ等の如く長尺のフィルム上に均−Ｃ：均質
の塗膜を形成するに適したものである。DETAILED DESCRIPTION OF THE INVENTION (a) Industrial application field The present invention relates to a coater nozzle for a gravure coating device, and in particular (
: Uniform C: Suitable for forming a homogeneous coating film on a long film such as a magnetic tape.

（ロ）従来の技術 慣用のグラビアロール塗布装置は、第２図にその要部を
示す如（、ＰＥＴ等のフィルム（３）ヲグラビアロール
（１）とパツキングロール（２）の間に挟持移送し、グ
ラビアロールの塗面に被着した塗料をフィルム上ｆ二転
写塗布する方法をとっている。そして塗膜厚の規制は、
ノズル（４）からグツとアロール（１）の塗面ｆ二高粘
度の感性塗料を噴出供給した後Ｃ二、ドクターブレード
（５）で計をする方法をとりており、グラビアロール（
１）より落下した余剰の塗料は、パン（６）で回収され
た後にチューブ（７）よりポンプｔ−介してノズル（４
）に循環する様Ｃ：なっている。(b) Conventional technology A conventional gravure roll coating device, the main part of which is shown in Fig. However, a method is used in which the paint adhered to the coating surface of the gravure roll is transferred onto the film.The coating thickness is regulated by:
After spraying high viscosity sensitive paint from the nozzle (4) to the coated surface of the gravure roll (1), the gravure roll (1) is measured using the doctor blade (5).
1) Excess paint that has fallen from the pan (6) is collected by the pan (6) and then sent from the tube (7) to the nozzle (4) via the pump T-.
) seems to be circulating C:.

しかしこの様な方式では塗料と外気との接触面積が大で
あり従って多量の溶剤が塗料より蒸発し塗料の性質（粘
度〕が変化する。またグラビアロールの回転運動やグラ
ビアロールに″過剰に付看した塗料のパン（７）への落
下ｆ二より空気が混入してしまう。However, in this type of method, the contact area between the paint and the outside air is large, and therefore a large amount of solvent evaporates from the paint, changing the properties (viscosity) of the paint. Also, due to the rotational movement of the gravure roll and excessive exposure to the gravure roll, Air is mixed in when the paint falls into the pan (7) f2.

塗料は高粘度である故フィルム上≦；塗布した段階では
際立つ念気泡は発散せず乾燥工程において熱のため膨張
し塗膜面ζ；ピンホールを形成してしまうという欠点を
余儀なくされる。またドクターブレードで計量される手
前のグラビアロール面上の液溜り量が一定とならず計量
後グラビアロールに残留する塗料の量が変化しその結果
フィルム上Ｃ：形成される塗膜厚も不均一なものとなる
という問題に加え、さらにパン内塗料の滞溜時間が長く
塗料中に凝集が生じやすい等の問題点を生する。Since the paint has a high viscosity, it is unavoidable that conspicuous bubbles do not dissipate on the film when it is applied, but expand due to heat during the drying process, resulting in the formation of pinholes on the film surface. In addition, the amount of liquid accumulated on the surface of the gravure roll before being measured by the doctor blade is not constant, and the amount of paint remaining on the gravure roll changes after being measured, resulting in uneven coating thickness on the film. In addition to this problem, the residence time of the paint inside the pan is long, and agglomeration tends to occur in the paint.

（ハ）発明が解決しようとする問題 本発明は、グラビアロール、ノズル及びドクターブレー
ドの回りで、塗料が過剰に外気（；触れ、塗料の粘度が
変化し且つ気泡が混入するという問題を屏決するためｔ
：、塗料と外気の接触を極力回避し、塗料が空気に触れ
る面積を出来る限り小さくして気泡の混入を防ぎ、ドク
ターブレードによる計量を均一とし、さらに塗料の滞溜
を防止し均一で均質な塗膜全形成し得るようにしたもの
である。(c) Problems to be Solved by the Invention The present invention solves the problem that the paint comes into contact with the outside air excessively around the gravure roll, nozzle, and doctor blade, causing the viscosity of the paint to change and air bubbles to be mixed in. Tame t
: Avoid contact between the paint and the outside air as much as possible, minimize the area where the paint comes in contact with the air to prevent air bubbles from entering, ensure uniform metering with the doctor blade, and prevent paint from stagnation to ensure a uniform and homogeneous product. This allows the entire coating to be formed.

に）問題点を屏決するための手段 グラビアロールの塗面Ｃ：近接し塗料を供給するノズル
の開口部（：、前記グラビアロールの帰路面に転接し、
残余の塗料ｔ−前記ノズルの開口（；戻すサブグラビア
ロールを設ける０ （ホ）作　用 フィルムベース亀；転写塗布したＩ＆≦：グラビアロー
ルの帰路面！−残る残余の塗料はノズルの開口転；臨ま
しめて設けたサブグラビアロールで確実にかき落しノズ
ル内１；回収され、グラビアロールの全面籠−は常区；
均一な塗料が供給されるとともに、ノズルの開口部はサ
ブグラビアロールとグラビアロールの転接及びドクタブ
レード等Ｃ二よる接触封止Ｃ二より、略気密状態を保た
れるから、塗料への気泡の発生、溶媒の揮発≦二よる塗
料の粘度及び質の劣化を防止し得る。(2) Means for determining the problem: Coated surface C of the gravure roll: Opening of a nozzle that supplies paint in the vicinity (:, in contact with the return surface of the gravure roll,
Remaining paint t - Opening of the nozzle (; Providing a sub-gravure roll to return 0 (e) Effect Film base turtle; Transfer coated I & ≦: Return surface of gravure roll! - The remaining paint is transferred to the opening of the nozzle; The sub-gravure roll that was set up was used to ensure that the inside of the nozzle was scraped off.
Uniform paint is supplied, and the opening of the nozzle is maintained in an almost airtight state due to the rolling contact between the sub-gravure roll and the gravure roll and the contact sealing C2 with a doctor blade etc., thereby preventing air bubbles from entering the paint. This can prevent deterioration of paint viscosity and quality due to solvent volatilization.

（へ）実　施　例 以下本発明の一実施例の側断面囚を示す掲２図１一つき
説用する。(F) Embodiment The following describes a side cross-sectional view of an embodiment of the present invention.

この実施例は、本発明を巾１２Ｑｍ、厚さ１５７ｐのＰ
ＥＴフィルム区；磁性塗料を塗布するグラビア塗布装置
のコータノズル；：適用したものである。In this example, the present invention is applied to a P with a width of 12Qm and a thickness of 157p.
ET film section: Applied to the coater nozzle of a gravure coating device that applies magnetic paint.

図番ｉｌｌで示されるグラビアロールは、パツキングロ
ールαυと相俟ってＰＥＴフィルム（Ｌ力を転接挟持し
定速で移送し乍らその下面に磁性塗料を転写塗布する。The gravure roll indicated by the number ill in the drawing works together with the packing roll αυ to transfer and apply the magnetic paint to the lower surface of the PET film (L force) while transferring the film at a constant speed.

前記グラビアロールＵ■の塗布面に磁性塗料全供給する
コータノズル（イ）は隔壁で区劃される塗料供給槽■と
回収槽ｆ４Ｇとを備える。この供給槽（至）は底部Ｃ；
フレキシブルな給液管Ｃ３１１［二接続された塗料投入
口墾を備え、前記隔壁■の開口端部（２第１ドクタブレ
ード５１）を、外壁お上部にサブグラビアロール（至）
を備える。The coater nozzle (a) which supplies all of the magnetic paint to the coated surface of the gravure roll U2 includes a paint supply tank (2) and a collection tank (f4G) separated by a partition wall. This supply tank (toward) is at the bottom C;
A flexible liquid supply pipe C311 [equipped with two connected paint inlets, connects the open end (2nd first doctor blade 51) of the partition wall (2) to the upper part of the outer wall to the sub-gravure roll (to)
Equipped with

前記サブグラビアロール（ロ）の周面には、上記グラビ
アロール（１Ｇ上に設けられたグラビア溝のピンチと同
じピッチで逆形状のグラビア溝が刻設されており、グラ
ビアロール（１Ｇ上の帰路面即ちＰＥＴフィルムから離
れた面に転接保合し、残余の塗料全かきとり或は移し収
って供給槽（至）内（；戻す。上記サブグラビアロール
（ロ）の軸受部（図示せず）は供給槽の側壁に対して封
止構造をなし、塗料の漏洩と外気の流入を防止する。On the circumferential surface of the sub-gravure roll (b), gravure grooves of the opposite shape are carved at the same pitch as the pinch gravure grooves provided on the gravure roll (1G), and the gravure grooves are formed on the return path on the gravure roll (1G) The surface, that is, the surface away from the PET film, is rolled and secured, and all remaining paint is scraped off or transferred and returned to the supply tank (to). ) has a sealing structure against the side wall of the supply tank to prevent leakage of paint and inflow of outside air.

田は、サブグラビアロール（ロ）に被着し′ｆｃ塗料を
除くためのブレードで、同時にサブグラビアロールの周
面と外壁（ト）の端面間の気密構造金兼ねる。The blade is a blade for removing the paint deposited on the sub-gravure roll (b), and also serves as an airtight structure between the peripheral surface of the sub-gravure roll and the end face of the outer wall (g).

気密構造が不十分な場合Ｃは、点線で図示せる如く上記
供給招田の外壁を外方に延長し、その上端面ｃ３力をグ
ラビアロール周面Ｃ二近接する様にしてもよい。If the airtight structure is insufficient, the outer wall of the supply wall may be extended outward as shown by the dotted line, and the upper end surface C3 may be brought close to the circumferential surface C2 of the gravure roll.

上記投入口から供給される磁性塗料圧のバラツキ或は前
記サブグラビアロールｌ３４１≦−よる回収塗料量の不
均一性Ｃ；基づく塗料吐出圧を一定に保つためＣ二、上
記隔壁■【二逃し弁Ｇｌ設ける。この逃し弁は、供給槽
１円（：臨む開口Ｑと、常閉付勢される弁６０ｆ：備え
、供給槽刃内の磁性塗料の圧力が規定値を超えると余剰
塗料を回収僧＋４１Ｊ内にのがし、供給槽内の塗料圧全
平準化する。Non-uniformity in the amount of recovered paint due to variations in the pressure of the magnetic paint supplied from the inlet or subgravure roll l341≦- C; In order to keep the paint discharge pressure constant based on C2, the partition wall ■ [2 Relief valve Provide Gl. This relief valve has an opening Q facing the supply tank and a normally closed valve 60f, and when the pressure of the magnetic paint in the supply tank blade exceeds a specified value, the excess paint is collected into and equalizes the total paint pressure in the supply tank.

上記回収槽口Ｏの外壁１５Ｇ即ちグラビアロール（１１
の塗面上ＰＥＴフィルムに近い側には第２ドクタブレー
ド（５５）を設け、前記第１ドクタブレード６υの計量
むらを除去しグラビアロール（１Ｇの塗面に均−厚の磁
性塗料［Ｆ］Ｏを破骨きせる。The outer wall 15G of the recovery tank opening O, that is, the gravure roll (11
A second doctor blade (55) is provided on the side closer to the PET film on the coated surface of the gravure roll (1G) to remove the measurement unevenness of the first doctor blade 6υ and apply a uniformly thick magnetic paint [F] to the coated surface of the gravure roll (1G). O is broken.

上記第２ドクタブレード６って除かれた塗料と逃し弁５
２ヲ経て回収された塗料は、回収槽（４Ｇの底部に設け
られた排出口（４υからフレキシブルな送液管Ｕ’に介
してバッファタンクσ唱；戻される。このバッファタン
クσ■は、液面センサ圓によって電磁弁を制御し磁性塗
料タンク（図示せず〕から供給される塗料量を制御して
常に定量計わえ、回収塗料と混合して吐出圧制御ポンプ
□への塗料圧を一定範囲円に保つと共ｌ：、回収塗料の
粘度変化等を希釈化する。吐出圧制御ポンプ■は、フレ
キシブル送液管（７υｔ−介してバッファタンクから送
出されてくる磁性塗料を上記供給槽（至）中≦：定圧力
で供給する念めＣ：、無段変速モータ（図示せず〕で駆
動される。The paint removed by the second doctor blade 6 and the relief valve 5
The paint recovered after passing through the recovery tank (4G) is returned to the buffer tank (σ) from the outlet (4υ) provided at the bottom of the recovery tank (4G) via a flexible liquid supply pipe U'. A solenoid valve is controlled by a surface sensor circle to control the amount of paint supplied from a magnetic paint tank (not shown), constantly measuring the amount of paint, and mixing it with recovered paint to keep the paint pressure to the discharge pressure control pump □ constant. The discharge pressure control pump (■) transfers the magnetic paint sent from the buffer tank via a flexible liquid supply pipe (7υt) to the supply tank (1). To) Medium ≦: Supply at constant pressure C: Driven by a continuously variable speed motor (not shown).

上述の構成で、塗料タンクから送液管（９ｏ］を経てバ
ッファタンクσＯ内（：供給される磁性塗料は、フレキ
シブル送液管（７υＣ二より吐出圧制御ポンプ□□□に
導ひかれ、送液管Ｃ３１）ｋ介して定圧力でノズルの供
給槽ｍｌｌ送送れ塗料の吐出方向とは逆方向に回転する
サブグラビアローラ（ロ）≦：よって一部圧力を減殺さ
れた形でグラビアロールＣ１（ｌの塗布面（：供給され
る。グラビアロール塗布面Ｃ：被着した塗料は第１、第
２ドクターブレード５１）（５５）で計量された後、Ｐ
ＥＴフィルムａシ上Ｃ二転写される。グラビアロール（
１Ｇ上の残余の塗料量は、サブグラビアロール（ロ）で
除去され、供給槽（至）内の塗料と再び混合される。With the above configuration, the magnetic paint supplied from the paint tank to the buffer tank σO via the liquid supply pipe (9o) is guided to the discharge pressure control pump □□□ through the flexible liquid supply pipe (7υC2), The supply tank ml of the nozzle is fed at a constant pressure through the pipe C31)k, and the sub-gravure roller (b) rotates in the opposite direction to the direction in which the paint is discharged. Coated surface (: supplied. Gravure roll coated surface C: The applied paint is measured by the first and second doctor blades 51) (55), and then
C2 is transferred onto ET film A. Gravure roll (
The remaining amount of paint on 1G is removed by the subgravure roll (b) and mixed again with the paint in the supply tank (to).

上記逃し弁５ｚｔ−経て回収された塗料と、第２ドクタ
ブレード霞によって計量された余剰の塗料とは回収槽（
４Ｇを経て再びバッファタンクσ唱；戻され磁性塗料は
一部ＩＰＥＴ上の塗膜として消費し乍ら上記ルートを循
環する。この塗料循環経路は塗料回収槽００円及びバッ
ファタンクσＱで僅か（：空気と触れるが、両者共準密
閉空間を形成しているから円部は塗工開始後直ちＣ；溶
剤の蒸気で充満し、それ以後の溶剤蒸発はなく密閉経路
に二等しくなるので塗料の組成変化を少なくする事が出
来る。従りて塗料への気泡の混入も防止出来る。また供
給槽１からの塗料の吐出圧は逃し弁６２Ｃ：より一定と
なること、第１第２ドクターブレードの併用と相俟りて
グラビアロールＣ１ｌ　Ｃ計量される塗料は一足となる
から塗膜Ｉの均一性が保証される。さらにポンプ（至）
により塗料は常Ｃ；略定圧１；で循環し流れているため
、塗料の滞溜による凝集を少なくする事が出来る。上記
送液管ｃ３υ（４っけフレキシブル管で構成しであるの
で、油圧、空気圧等の助力全便ってグラビアロールＣＩ
Ｇとノズル間の手入れ等の際にノズルをグラビアロール
の塗布面から離間し得る様に構成することが出来る。The paint collected through the relief valve 5zt and the surplus paint measured by the second doctor blade haze are collected in the collection tank (
After passing through 4G, the magnetic paint is returned to the buffer tank and circulates through the above route while being partially consumed as a coating film on the IPET. This paint circulation path has a small amount of contact with the air in the paint recovery tank 00 yen and the buffer tank σQ, but since both form a quasi-sealed space, the circular part is immediately filled with solvent vapor after the start of coating. However, since there is no subsequent solvent evaporation and the passage is closed, changes in the composition of the paint can be reduced.This also prevents air bubbles from entering the paint.Also, the discharge pressure of the paint from the supply tank 1 can be reduced. Relief valve 62C: The uniformity of the coating film I is guaranteed because the amount of paint to be measured by the gravure roll C1lC becomes one foot when combined with the first and second doctor blades.Furthermore, the pump (To)
Since the paint circulates and flows at a constant pressure of 1, it is possible to reduce agglomeration due to paint stagnation. Since the above-mentioned liquid supply pipe c3υ (consisting of 4 flexible pipes), all support such as hydraulic pressure and pneumatics is required for gravure roll CI.
The nozzle can be configured so that it can be separated from the coating surface of the gravure roll when cleaning between the G and the nozzle.

（ト〕効　果 本発明Ｃ：依れば、塗料が空気に触れる機会が極めて少
く、特≦二気泡が混入する機会を極力押えると共Ｃ：残
余の塗料がサブグラビアロールで一回転毎（：除去され
ドクタブレード等の計量手段の前段のグラビアロールの
塗布面に被着する塗料を均−且つ均質Ｃ；シ得るので高
精度の計重が可能となり、塗膜の性能を大巾Ｃ：向上し
得ることが出来る。(G) Effect of the present invention C: According to the present invention, there is an extremely small chance that the paint comes into contact with the air, and the chance that air bubbles are mixed in is minimized. : The paint that is removed and adhered to the coated surface of the gravure roll before the metering means such as a doctor blade can be uniformly and uniformly C: This enables highly accurate weighing and greatly improves the performance of the coating film. There are things that can be improved.

又、塗料は常に流動しているから塗料の凝集を少くする
ことが出来、塗膜の性能むらを防止することが出来る。Furthermore, since the paint is always in flux, aggregation of the paint can be reduced, and uneven performance of the paint film can be prevented.

【図面の簡単な説明】[Brief explanation of drawings]

第１図は本発明装置の要部断面図、累２図は従来例の要
部断面図である。 Ｃ１ｌ・・・グラビアロール、（Ｌｌ）・・・パツキン
グロール、■・・・コータノズル、■・・・供給槽、（
４Ｇ・・・回収槽、（至）・・・サブグラビアロールFIG. 1 is a sectional view of a main part of the apparatus of the present invention, and FIG. 2 is a sectional view of a main part of a conventional example. C1l... Gravure roll, (Ll)... Packing roll, ■... Coater nozzle, ■... Supply tank, (
4G...Collection tank, (to)...Sub-gravure roll

Claims (3)

【特許請求の範囲】[Claims] （１）グラビアロールの塗面に近接し塗料を供給するノ
ズルの開口部に、前記グラビアロールの帰路面に転接し
、残余の塗料を前記ノズルの開口に戻すサブグラビアロ
ールを設けたグラビア塗布装置のコータノズル。(1) A gravure coating device equipped with a sub-gravure roll that contacts the return surface of the gravure roll and returns the remaining paint to the opening of the nozzle, at the opening of a nozzle that is close to the coating surface of the gravure roll and supplies paint. coater nozzle. （２）前記ノズルは、開口部に前記サブグラビアロール
を設けた塗料供給槽と、開口部に計量手段を備え過剰の
塗料を受容する回収槽及び両槽の隔壁に上記供給槽側に
開口する逃し弁を設けたことを特徴とする特許請求の範
囲第１項記載のグラビア塗布装置のコータノズル。(2) The nozzle includes a paint supply tank in which the sub-gravure roll is installed in the opening, a recovery tank that has a measuring means in the opening and receives excess paint, and a partition wall between the two tanks that opens toward the supply tank side. A coater nozzle for a gravure coating device according to claim 1, characterized in that a relief valve is provided. （３）上記ノズルの開口とグラビアロールの塗布面の間
を上記サブグラビアロールとドクタブレードとで実質的
に封止し、ノズル内の塗料を外気と遮断することを特徴
とする特許請求の範囲第１項乃至第２項記載のグラビア
塗布装置のコータノズル。(3) Claims characterized in that the space between the opening of the nozzle and the coated surface of the gravure roll is substantially sealed by the sub-gravure roll and the doctor blade, thereby shielding the paint inside the nozzle from the outside air. A coater nozzle for a gravure coating device according to items 1 and 2.