JPH04244265A - Coating method - Google Patents
Coating methodInfo
- Publication number
- JPH04244265A JPH04244265A JP1246991A JP1246991A JPH04244265A JP H04244265 A JPH04244265 A JP H04244265A JP 1246991 A JP1246991 A JP 1246991A JP 1246991 A JP1246991 A JP 1246991A JP H04244265 A JPH04244265 A JP H04244265A
- Authority
- JP
- Japan
- Prior art keywords
- liquid
- coating
- tip
- injector
- web
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000000576 coating method Methods 0.000 title claims abstract description 92
- 239000007788 liquid Substances 0.000 claims abstract description 114
- 239000011248 coating agent Substances 0.000 claims abstract description 71
- 238000000034 method Methods 0.000 claims description 26
- 238000001125 extrusion Methods 0.000 claims description 9
- 238000002347 injection Methods 0.000 claims description 5
- 239000007924 injection Substances 0.000 claims description 5
- 239000000463 material Substances 0.000 description 7
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 6
- 229920005989 resin Polymers 0.000 description 5
- 239000011347 resin Substances 0.000 description 5
- 239000011324 bead Substances 0.000 description 4
- 230000006837 decompression Effects 0.000 description 4
- -1 polyethylene Polymers 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 239000004677 Nylon Substances 0.000 description 2
- 239000004698 Polyethylene Substances 0.000 description 2
- 238000007765 extrusion coating Methods 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229920001778 nylon Polymers 0.000 description 2
- 239000002985 plastic film Substances 0.000 description 2
- 229920006255 plastic film Polymers 0.000 description 2
- 229920000573 polyethylene Polymers 0.000 description 2
- 229920000098 polyolefin Polymers 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 238000005507 spraying Methods 0.000 description 2
- 230000037303 wrinkles Effects 0.000 description 2
- UOBYKYZJUGYBDK-UHFFFAOYSA-N 2-naphthoic acid Chemical compound C1=CC=CC2=CC(C(=O)O)=CC=C21 UOBYKYZJUGYBDK-UHFFFAOYSA-N 0.000 description 1
- 229920001747 Cellulose diacetate Polymers 0.000 description 1
- 229920002284 Cellulose triacetate Polymers 0.000 description 1
- 239000004952 Polyamide Substances 0.000 description 1
- 239000004743 Polypropylene Substances 0.000 description 1
- 239000004793 Polystyrene Substances 0.000 description 1
- NNLVGZFZQQXQNW-ADJNRHBOSA-N [(2r,3r,4s,5r,6s)-4,5-diacetyloxy-3-[(2s,3r,4s,5r,6r)-3,4,5-triacetyloxy-6-(acetyloxymethyl)oxan-2-yl]oxy-6-[(2r,3r,4s,5r,6s)-4,5,6-triacetyloxy-2-(acetyloxymethyl)oxan-3-yl]oxyoxan-2-yl]methyl acetate Chemical compound O([C@@H]1O[C@@H]([C@H]([C@H](OC(C)=O)[C@H]1OC(C)=O)O[C@H]1[C@@H]([C@@H](OC(C)=O)[C@H](OC(C)=O)[C@@H](COC(C)=O)O1)OC(C)=O)COC(=O)C)[C@@H]1[C@@H](COC(C)=O)O[C@@H](OC(C)=O)[C@H](OC(C)=O)[C@H]1OC(C)=O NNLVGZFZQQXQNW-ADJNRHBOSA-N 0.000 description 1
- 230000005856 abnormality Effects 0.000 description 1
- 238000007754 air knife coating Methods 0.000 description 1
- 238000007611 bar coating method Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 229920002301 cellulose acetate Polymers 0.000 description 1
- 239000008199 coating composition Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000007766 curtain coating Methods 0.000 description 1
- 238000003618 dip coating Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 230000009931 harmful effect Effects 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 239000003960 organic solvent Substances 0.000 description 1
- 239000000123 paper Substances 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 239000000049 pigment Substances 0.000 description 1
- 229920002647 polyamide Polymers 0.000 description 1
- 239000004417 polycarbonate Substances 0.000 description 1
- 229920000515 polycarbonate Polymers 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
- 229920000139 polyethylene terephthalate Polymers 0.000 description 1
- 239000005020 polyethylene terephthalate Substances 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 229920002223 polystyrene Polymers 0.000 description 1
- 229920002689 polyvinyl acetate Polymers 0.000 description 1
- 239000011118 polyvinyl acetate Substances 0.000 description 1
- 239000004800 polyvinyl chloride Substances 0.000 description 1
- 229920000915 polyvinyl chloride Polymers 0.000 description 1
- 238000007761 roller coating Methods 0.000 description 1
- 239000002356 single layer Substances 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
- 229920002554 vinyl polymer Polymers 0.000 description 1
Landscapes
- Application Of Or Painting With Fluid Materials (AREA)
Abstract
Description
【発明の詳細な説明】
【０００１】〔産業上の利用分野〕本発明は写真用フィ
ルム・印画紙等の写真感光材料や写真製版材料、磁気録
音テープ等の磁気記録材料、感圧記録紙，感熱記録紙等
記録材料の製造において、連続走行する長尺可撓性支持
体（以下「ウエブ」と称する）に液状塗布組成物（以下
「塗布液」と称する）を塗布する工程の改良に関し、更
に詳しくは改良されたエキストルージョン塗布方法又は
ビード塗布方法に関するものである。
【０００２】〔従来の技術〕従来より連続走行している
ウエブに塗布液を塗布する方法としては、各種の方法が
提案されて来た。一般に塗布工程は、ウエブに塗布液を
転移せしめる部分（以下「アプリケーション系」という
）とウエブに転移された塗布液を所望の塗布量に計量す
る部分（以下「計量系」という）とに分けて考えられる
ため、塗布方法はアプリケーション系、計量系の相違に
より分類されていた。アプリケーション系の相違に基づ
いて、ローラ塗布方法、ディップ塗布方法、ファウンテ
ン塗布方法等、計量系の相違に基づいて、エアーナイフ
塗布方法、ブレード塗布方法、バー塗布方法等が知られ
ていた。またアプリケーションと計量とを同一の部分で
担当するものとして、エクストルージョン塗布方法、ビ
ード塗布方法、カーテン塗布方法が知られていた。この
うちスロットより液を吐出させ、バックアップローラに
巻回して走行する支持体上に塗布する方法としてエクス
トルージョン塗布方法及びビード塗布方法は支持体と直
接接触しない精密な塗布方法として使用されてきた。
上記塗布方式は例えば特公昭４５−１２３９０号公報、
特公昭４６−２６２３６号公報に開示されているような
多層塗布装置に関するもの、特開昭５０−１４２６４３
号公報に開示されている単層に関する塗布方法、あるい
は、特開昭５６−９５３６３号公報，特開昭６２−１１
０７７６号公報に開示されている吐出スロットが上向に
位置しているい塗布方法及び装置等数多くの特許が出願
されている。
【０００３】上記エクストルージョンコーターを用いた
塗布方法としては、高速塗布時に高い負圧を塗布液架橋
の背部に適用する場合もしくは加圧を架橋前部に用いる
場合、支持体全巾にわたって、直ちに塗布膜が形成され
ないので、これらに対する対策として、一般に一時的に
注液器の先端リップ面とウエブとのクリアランスを狭め
る方法、もしくはエクストルージョン型注液器より塗布
液を吐出させ、バックアップローラに巻回されて走行す
る支持体上に塗布液架僑を形成させ、塗布液架橋の背部
を減圧もしくは前部を加圧して塗布する方法において、
塗り付け開始時に、注液器を所定の位置に設定し、塗布
液架橋の背部の減圧もしくは前部の加圧条件を設定した
後に、注液器の先端より塗布液を吐出させ、しかる後に
バックアップローラに巻回されて走行する支持体と注液
器の先端部との隙間の巾方向の任意の位置に薄い板状物
を短時間挿入するか、又は細管もしくはスリットより噴
出する気体を短時間当てることにより、塗り付けを開始
する方法が行なわれている（特願平１−１３０４４８号
）。
【０００４】
【発明が解決しようとする課題】しかしながら従来のこ
の方法はクリアランスを狭くした時に，ウエブ上の付着
物によるスジ故障が発生したり、あるいはウエブに工程
異常によってオレ，シワ等のあった場合、ウエブがリッ
プ先端面での引掛かりをおこす等の不都合を生じる問題
点を有していた。また、薄い板状物を挿入する方法もし
くは細管またはスリットを用いて気体を噴出する方法は
板状物の挿入または噴出する気体により塗り付けの先頭
部にアワ立ちや波立ちが起り易くこれによるスジ故障の
発生等の問題点を有していた。本発明の目的は上記従来
技術の問題点を解消し、高速塗布時の塗付け開始時にス
ジ故障，ウエブの引掛かり故障を発生させることなく、
良好な塗り付け方法を提供することにある。
【０００５】
【課題を解決するための手段】本発明の上記目的は（１
）エクストルージョン型注液器より塗布液を吐出させ、
バックアップローラに巻回されて走行する支持体上に塗
布液架橋を形成させ、塗布液架橋の背部を減圧もしくは
前部を加圧して塗布する方法において、塗り付け開始時
に、先ず注液器を塗布時の所定の位置に設定し、注液器
の先端より塗布液を吐出させ、しかる後にバックアップ
ローラに巻回されて走行する支持体と注液器の先端部と
の隙間の前方もしくは後方の巾方向の任意の位置に対し
細管より噴出する液体を短時間当てることにより、塗り
付けを開始することを特徴とする塗布方法。
（２）エクストルージョン型注液器より塗布液を吐出さ
せ、バックアップローラに巻回されて走行する支持体上
に塗布液架橋を形成させ、塗布液架橋の背部を減圧もし
くは前部を加圧して塗布する方法において、塗り付け開
始時に、先ず注液器を塗布時の所定の位置に設定し、注
液器の先端より塗布液を吐出させ、しかる後に注液器の
先端よりわずか後方の支持体上に直接、細管より噴出す
る液体を短時間当てることにより塗り付けを開始するこ
とを特徴とする塗布方法。により達成される。
【０００６】本発明においてバックアプローラに巻回さ
れて走行する支持体と注液器の先端部との隙間の巾方向
の任意の位置に対し短時間液体を当てる細管としては、
金属製あるいは樹脂製，ガラス製等で内径の寸法は０．
２〜１．５ｍｍ程度の円形または角形，若しくはスリッ
ト状のものを用いる。 本発明において細管より噴出
させる液体としては、主に注液器４より吐出される塗布
液に含有される溶媒，水もしくはそれに近い粘度の低い
液体を用いる。又、一回に噴出する液体の量は０．０１
〜１ミリリットル程度で、これより少ないと塗り付けが
開始されず、これより多いと塗り付けの先頭形状が悪化
してスジ発生等の原因になることが確認されている。ま
た一回に噴出する液の形態は一滴の水滴状を形成させる
事が好ましく放射線状に長く噴出させると注液器先端部
の塗布液が薄められ長時間にわたり、薄塗り状のスジ故
障が発生することが判っている。このように一回の塗り
付けに一定かつ微量を一滴の水滴形状で投射することに
より、１〜５秒の短時間で弊害のない理想的な塗付けパ
ターンを得ることが出来る。又投射する位置は請求項１
の方法の場合、バックアップローラに巻回されて走行す
る支持体と注液器先端との隙間の前方若しくは後方の幅
方向の任意の位置でよい。
【０００７】以下添付した図面により、本発明の態様に
ついて詳しく述べる。図１は本発明の請求項１の態様で
ある塗布装置の斜視図（Ａ），横断面図（Ｂ）である。
本発明においてバックアップローラ３に巻回されて走行
する支持体１〜２と注液器先端１３との隙間の巾方向の
任意の位置に対し短時間液体を当てる細管５は金属製あ
るいは樹脂製又はガラス製等で内径の寸法は０．２〜１
．５ｍｍ程度の円形または楕円形もしくはスリット状の
ものを用いる。また一回に噴出する液体の量は０．０１
〜１ミリリットル程度で、これより少ないと塗り付けが
開始されず、これより多いと塗り付けの先頭形状が悪化
してスジ発生等の原因になることが確認されている。
また一回に噴出する液の形態は１滴の水滴形状を形成さ
せることが好ましく直線状に長く噴出させると注液器先
端部１３付近の塗布液が薄められ長時間にわたり薄塗り
状のスジ故障が発生することがわかっている。ここまで
の記述については請求項２の方法も同様である。また、
この液を投射する位置については請求項１の方法は図１
及び図２の様にバックアップローラ３に巻回されて走行
する支持体１〜２と注液器先端１３との隙間の前方或い
は後方の巾方向の任意の位置に液体吐出器６を設置し、
投射する角度を水平もしくは０〜４５°上向きに設定す
る。
【０００８】また請求項２の方法については、図３の様
に減圧室１１の内部に液体吐出器６を設置し注液器の先
端１３よりわずか後方， リットル＝ ５〜２０ｍｍの
位置にノズル５を支持体１ に向け、走行する支持体１
の表面に直接液を投射する。本発明について更に説明を
付け加えると、本発明における塗布液としては特に限定
されるものではなく、高分子化合物の水または有機溶媒
液，顔料水分散液，コロイド溶液等が含まれる。また、
塗布液の物性も特に限定されるものではないが、ウエブ
上に塗布された液の条件としては粘度は低い方が適して
おり、１００ｃｐｓ 以下特に５０ｃｐｓ 以下の状態
が適している。
表面張力も限定されてないが、５０ｄｙｎｅ／ｃｍ以下
で好ましい結果が得られる。本発明におけるウエブとは
紙、プラスチックフィルム、レジンコーティッド紙、エ
ルミニウムウエブ、合成紙等が含有される。プラスチッ
クフィルムの材質は、たとえば、ポリエチレン，ポリプ
ロピレン等のポリオレフィン、ポリ酢酸ビニル、ポリ塩
化ビニル；ポリスチレン等のビニル重合体、６，６−ナ
イロン，６−ナイロン等のポリアミド、ポリエチレンテ
レフタレート，ポリエチレン−２， ６−ナフタレート
等のポリエステル、ポリカーボネート，セルローストリ
アセテート，セルロースダイアセテート等のセルロース
アセテート等が使用される。またレジンコーティッド紙
に用いる樹脂としては、ポリエチレンをはじめとするポ
リオレフィンが代表的であるが、必ずしもこれに限定さ
れない。
【０００９】
【作 用】本発明は液体吐出器より投射された液
体により支持体と注液器の先端との間隙を架橋するか、
又は間隙が狭くなることによって、後者の場合は投射さ
れた液体がウエブに付着したままウエブと共に走行して
コーターリップ上を通過する際に塗布液に接触すること
により塗布液がウエブに塗付く機会を得る。１ケ所の塗
付けが出来れば、それを伝って塗布面が拡がり全面に塗
布することが出来る。
【００１０】
【実施例】以下添付した図面を用いて本発明の実施例を
説明する。
（実施例−１）図１は本発明の塗布方法の１実施態様で
ある塗布装置の斜視図（Ａ），横断面図（Ｂ）である。
塗付け開始時、エクストルージョン型注液器４が所定の
塗布位置に設定され、塗布液が該注液器４の吐出口より
流出した後に、塗布液架橋の前部に設置した先端径０．
８ｍｍの液体吐出器６から成分がメタノールの液体を注
液器先端１３とウエブ１の間の微少な隙間０．４ｍｍの
間に０．５ミリリットルの液体を投射することにより塗
布液がウエブ上に塗れ拡がる。
（実施例−２）同様に図２は別の実施例を示す塗布装置
の横断面図であり、上記操作において，先端径０．８ｍ
ｍの液体吐出器６を塗布液架橋の背部の減圧室１１内に
注液器先端１３より２０ｍｍの位置に設置し、注液器先
端１３とウエブ１の間の隙間０．４ｍｍに対し０．３ミ
リリットルの水を投射することにより塗布液がウエブ上
に塗れ拡り、塗布開始時の塗付けを行うことができた。
（実施例−３）同様に図３は別の実施例を示す塗布装置
の横断面図であり上記操作において、前記液体吐出器６
を塗布液架橋の背部の減圧室１１内に設置し、注液器先
端１３の上流側１５ｍｍの位置にウエブに直接０．５ミ
リリットルのメタノールを投射することにより、ウエブ
１に付着した液が注液器先端１３とウエブ１の間の微少
な隙間を通過する時にコーター４の吐出口より流出した
塗布液とウエブ１が接触して塗布液が塗れ拡げられた。
【００１１】上記方法によって塗り付けを開始した時の
パターンは前部注液器の塗付け正面から投射した場合は
、第４図（Ａ）のように投射した位置よりビードが形成
され支持体全巾に塗れ拡がる。又減圧室側から隙間に対
して投射した場合もしくは、減圧室側のウエブに投射し
た場合はそれぞれ図（Ｂ），（Ｃ）の様に投射した液に
より塗り付け部周辺の塗布液が希釈され先頭部がムラ状
になるが、全巾に塗れ広がるまでには安定な面状となる
。なお，図４にて横線を施した部分は塗布面を示すもの
である。本発明は図５に示すように、バックアップロー
ラに対するコータの角度は自由に設定することが出来る
。即ち、左下（Ａ），真下（Ｂ），右下（Ｃ），又、（
Ｄ）図のようにバックアップローラがエアフローティン
グドラムであってもよい。又液体吐出器は移動装置を取
り付け移動させることもできる。更に、液体吐出器には
、図１（Ｂ）に示すバルブ７をオン・オフさせることに
より吐出器を移動せずに塗り付け操作を行なうこともで
きる。
【００１２】
【発明の効果】本発明の塗布方法により高速塗布時にお
いて塗り付け開始時のスジ故障，ウエブの引掛り故障を
発生させることなく塗布を開始することが出来、塗布品
質の向上及び生産速度の上昇に貢献することが出来た。Detailed Description of the Invention [0001] [Industrial Application Field] The present invention is applicable to photographic materials such as photographic film and photographic paper, photolithographic materials, magnetic recording materials such as magnetic recording tape, pressure-sensitive recording paper, Regarding improvements in the process of applying a liquid coating composition (hereinafter referred to as "coating liquid") to a continuously running long flexible support (hereinafter referred to as "web") in the production of recording materials such as heat-sensitive recording paper, More particularly, the present invention relates to improved extrusion or bead coating methods. [Prior Art] Various methods have been proposed for applying a coating liquid to a continuously running web. Generally, the coating process is divided into a part that transfers the coating liquid onto the web (hereinafter referred to as the "application system") and a part that measures the coating liquid transferred to the web to the desired amount of coating (hereinafter referred to as the "measuring system"). Therefore, coating methods were classified based on the differences in application type and measurement type. Based on differences in application systems, roller coating methods, dip coating methods, fountain coating methods, etc., and based on differences in metering systems, air knife coating methods, blade coating methods, bar coating methods, etc. have been known. In addition, extrusion coating methods, bead coating methods, and curtain coating methods have been known as methods in which application and measurement are performed in the same part. Among these methods, the extrusion coating method and the bead coating method have been used as precise coating methods that do not come into direct contact with the support, in which the liquid is discharged from a slot and coated on a traveling support by being wound around a backup roller. The above coating method is disclosed in, for example, Japanese Patent Publication No. 45-12390,
Regarding a multilayer coating device as disclosed in Japanese Patent Publication No. 46-26236, Japanese Patent Publication No. 50-142643
The coating method for a single layer disclosed in Japanese Patent Laid-open No. 56-95363 and Japanese Patent Laid-Open No. 62-11
Many patents have been filed, including a coating method and apparatus in which the ejection slot is located upward, as disclosed in Japanese Patent No. 0776. [0003] As a coating method using the above-mentioned extrusion coater, when high negative pressure is applied to the back of the coating liquid bridge during high-speed coating, or when pressure is applied to the front of the bridge, the coating is applied immediately over the entire width of the support. As a film is not formed, the common countermeasures are to temporarily narrow the clearance between the tip lip of the liquid injector and the web, or to discharge the coating liquid from an extrusion type liquid injector and wind it around a backup roller. In this method, a coating liquid bridge is formed on a supporting body that is moved, and the coating is applied by reducing pressure on the back part of the coating liquid bridge or applying pressure on the front part,
At the start of coating, set the liquid injector in the specified position, set the conditions for depressurizing the back of the coating liquid bridge or pressurizing the front, then discharge the coating liquid from the tip of the liquid injector, and then back up. A thin plate-shaped object is inserted for a short period of time at any position in the width direction of the gap between the support that is wound around a roller and the tip of the liquid injector, or the gas ejected from a thin tube or slit is inserted for a short period of time. A method has been used in which smearing is started by applying the material to the surface (Japanese Patent Application No. 1-130448). [Problems to be Solved by the Invention] However, in this conventional method, when the clearance is narrowed, streak failures may occur due to deposits on the web, or the web may have creases, wrinkles, etc. due to process abnormalities. In this case, there is a problem in that the web gets caught on the tip end surface of the lip. In addition, with the method of inserting a thin plate-like object or the method of ejecting gas using a thin tube or slit, the insertion of the plate-like object or the ejected gas tends to cause wrinkles or ripples at the beginning of the application, resulting in streaks. There were problems such as the occurrence of The purpose of the present invention is to solve the above-mentioned problems of the prior art, and to eliminate streak failures and web catching failures at the start of coating during high-speed coating.
The purpose is to provide a good smearing method. [Means for Solving the Problems] The above objects of the present invention are (1)
) Dispense the coating liquid from an extrusion type liquid injection device,
In this method, a coating liquid bridge is formed on a support that is wound around a backup roller and travels, and the coating is applied by reducing pressure on the back side of the coating liquid bridge or applying pressure on the front side. The width of the front or rear of the gap between the tip of the liquid injector and the support that is set at a predetermined position at the time and discharges the coating liquid from the tip of the liquid injector, and then is wound around a backup roller and travels. An application method characterized by starting application by applying a liquid ejected from a thin tube to an arbitrary position for a short period of time. (2) Discharge the coating liquid from an extrusion type liquid injection device to form a coating liquid bridge on the support that is wound around a backup roller and travels, and reduce the pressure on the back of the coating liquid bridge or pressurize the front part of the coating liquid bridge. In the coating method, at the start of coating, the liquid injector is first set at the predetermined position for application, the coating liquid is discharged from the tip of the liquid injector, and then the liquid is placed on the support slightly behind the tip of the liquid injector. An application method characterized by starting application by directly applying liquid ejected from a thin tube for a short period of time. This is achieved by [0006] In the present invention, the thin tube that applies liquid for a short time to any position in the width direction of the gap between the support that is wound around the back-up roller and the distal end of the liquid injector is as follows:
Made of metal, resin, glass, etc. with an inner diameter of 0.
A circular or square shape, or a slit-shaped one with a diameter of about 2 to 1.5 mm is used. In the present invention, the liquid to be ejected from the thin tube is mainly a solvent contained in the coating liquid ejected from the liquid injector 4, water, or a low viscosity liquid similar to water. Also, the amount of liquid ejected at one time is 0.01
It has been confirmed that if the amount is less than 1 ml, smearing will not start, and if it is more than this, the shape of the beginning of smearing will deteriorate and cause streaks. In addition, it is preferable that the form of the liquid that is ejected at one time is in the form of a single droplet.If the liquid is ejected in a long radial manner, the applied liquid at the tip of the injector will be diluted and over a long period of time, a thin coating-like streak failure will occur. I know that I will. In this manner, by projecting a constant and minute amount in the form of a single droplet for each application, an ideal application pattern without any harmful effects can be obtained in a short time of 1 to 5 seconds. Also, the projection position is claimed in claim 1.
In the case of method (2), it may be placed at any position in the width direction, in front or behind the gap between the support body that is wound around a backup roller and travels, and the tip of the liquid injector. Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. FIG. 1 is a perspective view (A) and a cross-sectional view (B) of a coating device according to a first aspect of the present invention. In the present invention, the thin tube 5 that applies liquid for a short period of time to any position in the width direction of the gap between the supports 1 to 2 that are wound around the backup roller 3 and the tip 13 of the liquid injector is made of metal, resin, or Made of glass, etc., with an inner diameter of 0.2 to 1
．． A circular, oval, or slit-shaped material with a diameter of about 5 mm is used. Also, the amount of liquid ejected at one time is 0.01
It has been confirmed that if the amount is less than 1 ml, smearing will not start, and if it is more than this, the shape of the beginning of smearing will deteriorate and cause streaks. In addition, it is preferable that the form of the liquid ejected at a time is in the form of a single droplet.If the liquid is ejected in a long straight line, the coating liquid near the tip 13 of the liquid injector will be diluted, resulting in thin coating streaks over a long period of time. is known to occur. The description up to this point also applies to the method of claim 2. Also,
Regarding the position of projecting this liquid, the method of claim 1 is shown in FIG.
And as shown in FIG. 2, the liquid ejector 6 is installed at any position in the width direction in front or behind the gap between the supports 1 to 2 which are wound around the backup roller 3 and travel and the tip 13 of the liquid injector.
Set the projection angle horizontally or 0 to 45 degrees upward. In the method of claim 2, a liquid ejector 6 is installed inside the decompression chamber 11 as shown in FIG. Aiming at support 1 , support 1 is running.
Project the liquid directly onto the surface. To further explain the present invention, the coating liquid in the present invention is not particularly limited, and includes a water or organic solvent liquid of a polymer compound, an aqueous pigment dispersion, a colloidal solution, and the like. Also,
Although the physical properties of the coating liquid are not particularly limited, it is preferable that the liquid applied onto the web has a low viscosity, and preferably 100 cps or less, particularly 50 cps or less. The surface tension is also not limited, but preferable results can be obtained with a surface tension of 50 dyne/cm or less. The web in the present invention includes paper, plastic film, resin-coated paper, eruminium web, synthetic paper, and the like. The materials of the plastic film include, for example, polyolefins such as polyethylene and polypropylene, polyvinyl acetate, and polyvinyl chloride; vinyl polymers such as polystyrene; polyamides such as 6,6-nylon and 6-nylon; polyethylene terephthalate; polyethylene-2; Polyesters such as 6-naphthalate, polycarbonates, and cellulose acetates such as cellulose triacetate and cellulose diacetate are used. Further, the resin used for resin-coated paper is typically polyolefin such as polyethylene, but is not necessarily limited thereto. [Function] The present invention bridges the gap between the support and the tip of the liquid injector using the liquid projected from the liquid ejector, or
Or, as the gap becomes narrower, in the latter case, the projected liquid remains attached to the web and travels with the web, and when it passes over the coater lip, it comes into contact with the coating liquid, giving rise to an opportunity for the coating liquid to coat the web. get. If you can apply it to one spot, the applied surface will spread along that area and you can apply it to the entire surface. [0010] Embodiments of the present invention will be described below with reference to the attached drawings. (Example 1) FIG. 1 is a perspective view (A) and a cross-sectional view (B) of a coating apparatus which is an embodiment of the coating method of the present invention. At the start of coating, the extrusion type liquid injector 4 is set at a predetermined application position, and after the coating liquid flows out from the discharge port of the liquid injector 4, the tip diameter 0.
The coating liquid is applied onto the web by projecting 0.5 ml of a liquid containing methanol from an 8 mm liquid ejector 6 into a minute gap of 0.4 mm between the tip 13 of the injector and the web 1. It spreads. (Example 2) Similarly, FIG. 2 is a cross-sectional view of a coating device showing another example, and in the above operation, the tip diameter was 0.8 m.
The liquid ejector 6 of 1.m is installed in the reduced pressure chamber 11 behind the coating liquid bridge at a position 20 mm from the tip 13 of the liquid injector, and the gap between the tip 13 of the liquid injector 13 and the web 1 is 0.4 mm. By spraying 3 milliliters of water, the coating solution was spread over the web, making it possible to perform coating at the start of coating. (Embodiment 3) Similarly, FIG. 3 is a cross-sectional view of a coating device showing another embodiment, and in the above operation, the liquid ejector 6
is installed in the vacuum chamber 11 behind the coating liquid bridge, and by spraying 0.5 ml of methanol directly onto the web at a position 15 mm upstream from the tip 13 of the liquid injector, the liquid adhering to the web 1 can be injected. When passing through the minute gap between the tip 13 of the liquid container and the web 1, the web 1 came into contact with the coating liquid flowing out from the discharge port of the coater 4, and the coating liquid was spread. When coating is started using the above method and the pattern is projected from the front of the front liquid injector, a bead is formed from the projected position as shown in FIG. 4(A) and the entire support is covered. It spreads all over the place. In addition, when projecting into the gap from the decompression chamber side or onto the web on the decompression chamber side, the applied liquid around the coating area is diluted by the projected liquid as shown in Figures (B) and (C), respectively. The top part will be uneven, but by the time the entire width is covered, the surface will be stable. Note that the horizontally lined portion in FIG. 4 indicates the coated surface. In the present invention, as shown in FIG. 5, the angle of the coater with respect to the backup roller can be set freely. That is, the lower left (A), the lower right (B), the lower right (C), and (
D) The backup roller may be an air floating drum as shown. The liquid ejector can also be moved by attaching a moving device. Furthermore, a coating operation can be performed on the liquid ejector without moving the ejector by turning on and off the valve 7 shown in FIG. 1(B). [0012] The coating method of the present invention makes it possible to start coating without causing streak failures or web catching failures during high-speed coating, thereby improving coating quality and production. I was able to contribute to the increase in speed.
【図１】本発明の塗布方法の１実施例の斜視図（Ａ），
横断面図（Ｂ）FIG. 1 is a perspective view (A) of one embodiment of the coating method of the present invention;
Cross section (B)
【図２】本発明の塗布方法の別の実施例−２を説明する
横断面図、FIG. 2 is a cross-sectional view illustrating another embodiment-2 of the coating method of the present invention;
【図３】本発明の実施例−３を説明する横断面図，FIG. 3 is a cross-sectional view illustrating Example-3 of the present invention;
【図
４】本発明の塗り付け方式による塗布面の形成状況を示
す正面図、FIG. 4 is a front view showing the formation of a coated surface by the coating method of the present invention;
【図５】本発明の塗布方法が可能なコーターのバックア
ップローラに対する別の関係位置を示す側面図である。FIG. 5 is a side view showing another position of the coater in relation to the backup roller in which the coating method of the present invention is possible.
１ ウエブ ２ 塗布後のウエブ ３ バックアップローラ ４ エクストルージョン型注液器 ５ 細管 ６ 液体吐出器 ７ バルブ ８ チューブ １０ エアフローティングドラム １１ 減圧室 １２ 排気管 １３ 注液器の先端 1. Web 2. Web after coating 3 Backup roller 4 Extrusion type liquid injection device 5 Thin tube 6 Liquid dispenser 7 Valve 8 Tube 10 Air floating drum 11 Decompression chamber 12 Exhaust pipe 13 Tip of liquid injector
Claims (2)
塗布液を吐出させ、バックアップローラに巻回されて走
行する支持体上に塗布液架橋を形成させ、塗布液架橋の
背部を減圧もしくは前部を加圧して塗布する方法におい
て、塗り付け開始時に、先ず注液器を塗布時の所定の位
置に設定し、注液器の先端より塗布液を吐出させ、しか
る後にバックアップローラに巻回されて走行する支持体
と注液器の先端部との隙間の前方もしくは後方の巾方向
の任意の位置に対し細管より噴出する液体を短時間当て
ることにより、塗付けを開始することを特徴とする塗布
方法。[Claim 1] A coating liquid is discharged from an extrusion type liquid injection device to form a coating liquid bridge on a support that is wound around a backup roller and travels, and the back part of the coating liquid bridge is depressurized or the front part is applied. In the pressure application method, at the start of application, the liquid injector is first set at the predetermined position for application, and the coating liquid is discharged from the tip of the injector, after which it is wound around a backup roller and runs. A coating method characterized in that coating is started by applying liquid ejected from a thin tube for a short period of time to any position in the width direction of the front or rear of the gap between the support and the tip of the liquid injector.
液を吐出させ、バックアップローラに巻回されて走行す
る支持体上に塗布液架橋を形成させ、塗布液架橋の背部
を減圧もしくは前部を加圧して塗布する方法において、
塗り付け開始時に、注液器を塗布時の所定の位置に設定
し、注液器の先端より塗布液を吐出させ、しかる後に注
液器の先端よりわずか後方の支持体上に直接細管より噴
出する液体を短時間当てることにより塗り付けを開始す
ることを特徴とする塗布方法。2. The coating liquid is discharged from an extrusion type liquid injection device to form a coating liquid bridge on a support that is wound around a backup roller and travels, and the back part of the coating liquid bridge is depressurized or the front part is applied. In the pressure application method,
At the start of coating, the liquid injector is set at the predetermined position for application, and the coating liquid is discharged from the tip of the liquid injector, and then directly from the thin tube onto the support slightly behind the tip of the liquid injector. An application method characterized by starting application by applying a liquid for a short period of time.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3012469A JP2655366B2 (en) | 1991-01-10 | 1991-01-10 | Application method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3012469A JP2655366B2 (en) | 1991-01-10 | 1991-01-10 | Application method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH04244265A true JPH04244265A (en) | 1992-09-01 |
| JP2655366B2 JP2655366B2 (en) | 1997-09-17 |
Family
ID=11806227
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3012469A Expired - Fee Related JP2655366B2 (en) | 1991-01-10 | 1991-01-10 | Application method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2655366B2 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6482472B2 (en) | 1998-10-13 | 2002-11-19 | Fuji Photo Film Co., Ltd. | Method for producing a photopolymerizing lithographic plate including coating and conveying a web using rubber rollers before and after the coating step |
| JP2003088791A (en) * | 2001-09-17 | 2003-03-25 | Hirano Tecseed Co Ltd | Method and apparatus for coating |
| US7208201B2 (en) | 2001-03-22 | 2007-04-24 | Fujifilm Corporation | Coating apparatus and method having a slide bead coater and liquid drop applicator |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5231727A (en) * | 1975-09-05 | 1977-03-10 | Fuji Photo Film Co Ltd | Coating method |
| JPS5457550A (en) * | 1977-09-29 | 1979-05-09 | Voith Gmbh J M | Method and apparatus for coating one surface of fiber web and wetting the other surface thereof |
| JPS61257268A (en) * | 1985-05-10 | 1986-11-14 | Fuji Photo Film Co Ltd | Coating method |
-
1991
- 1991-01-10 JP JP3012469A patent/JP2655366B2/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5231727A (en) * | 1975-09-05 | 1977-03-10 | Fuji Photo Film Co Ltd | Coating method |
| JPS5457550A (en) * | 1977-09-29 | 1979-05-09 | Voith Gmbh J M | Method and apparatus for coating one surface of fiber web and wetting the other surface thereof |
| JPS61257268A (en) * | 1985-05-10 | 1986-11-14 | Fuji Photo Film Co Ltd | Coating method |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6482472B2 (en) | 1998-10-13 | 2002-11-19 | Fuji Photo Film Co., Ltd. | Method for producing a photopolymerizing lithographic plate including coating and conveying a web using rubber rollers before and after the coating step |
| US7208201B2 (en) | 2001-03-22 | 2007-04-24 | Fujifilm Corporation | Coating apparatus and method having a slide bead coater and liquid drop applicator |
| US7438763B2 (en) * | 2001-03-22 | 2008-10-21 | Fujifilm Corporation | Coating apparatus and method having a slide bead coater and liquid drop applicator |
| JP2003088791A (en) * | 2001-09-17 | 2003-03-25 | Hirano Tecseed Co Ltd | Method and apparatus for coating |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2655366B2 (en) | 1997-09-17 |
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