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JP2597237B2 - Application method - Google Patents

Application method

Info

Publication number
JP2597237B2
JP2597237B2 JP2413983A JP41398390A JP2597237B2 JP 2597237 B2 JP2597237 B2 JP 2597237B2 JP 2413983 A JP2413983 A JP 2413983A JP 41398390 A JP41398390 A JP 41398390A JP 2597237 B2 JP2597237 B2 JP 2597237B2
Authority
JP
Japan
Prior art keywords
coating
time
web
charge amount
present
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.)
Expired - Lifetime
Application number
JP2413983A
Other languages
Japanese (ja)
Other versions
JPH04225864A (en
Inventor
亮 楠岡
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Fujifilm Holdings Corp
Original Assignee
Fuji Photo Film Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Fuji Photo Film Co Ltd filed Critical Fuji Photo Film Co Ltd
Priority to JP2413983A priority Critical patent/JP2597237B2/en
Priority to US07/743,062 priority patent/US5340616A/en
Publication of JPH04225864A publication Critical patent/JPH04225864A/en
Application granted granted Critical
Publication of JP2597237B2 publication Critical patent/JP2597237B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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  • Heat Sensitive Colour Forming Recording (AREA)
  • Color Printing (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【0001】[0001]

【産業上の利用分野】本発明は塗布方法に関する。特に
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、磁気記録材料、感圧複写紙、感熱複写紙等の製造
において、高速で連続走行している長尺帯状支持体(以
下「ウエブ」と称す)に帯電させた後写真乳剤や磁性剤
等の塗布液をビードを形成して塗布する方法に関するも
のである。
The present invention relates to a coating method. Particularly, in the production of photographic photosensitive materials such as photographic films and photographic papers, photoengraving materials, magnetic recording materials, pressure-sensitive copying papers, and thermosensitive copying papers, etc., a long strip-shaped support (hereinafter, referred to as a "high speed continuous running"). (Hereinafter referred to as "web"), and applying a coating solution such as a photographic emulsion or a magnetic agent to form a bead.

【0002】[0002]

【従来の技術】従来写真感光材料,磁気記録材料,記録
紙等の塗布において、高速で連続的に走行するウエブに
帯電させた後塗布液をビードを形成して塗布する方法が
ひろく知られている。即ち、 塗布開始時点及び/又
は接合部分にのみ放電処理を行う塗布方法(特開昭55
−142565号公報参照)。 塗布液のビード形成
部又はそれに至る直前の支持体表面に0.1KV以上の
電位を付与する方法(特開昭61−146369号公
報)。 塗り付け前は支持体に一定帯電電位で帯電さ
せかつ減圧度を定常減圧度以下にしておき、塗り付け後
減圧度を定常減圧度以上に一定時間保ち、しかる後に定
常減圧度に移行する塗布方法(特開平1−258772
号公報)等がある。
2. Description of the Related Art Conventionally, in the application of photographic light-sensitive materials, magnetic recording materials, recording paper, etc., a method of forming a bead and applying a coating solution after charging a continuously running web at a high speed is widely known. I have. That is, a coating method in which a discharge treatment is performed only at the start of coating and / or at a joint portion (Japanese Patent Application Laid-Open
-142565). A method in which a potential of 0.1 KV or more is applied to the bead forming portion of the coating solution or the surface of the support immediately before reaching the portion (JP-A-61-146369). Before coating, the support is charged at a constant charging potential and the degree of depressurization is kept at or below the steady-state depressurizing degree.After coating, the depressurizing degree is kept at or above the steady-state depressurizing degree for a certain period of time, and then the coating method shifts to the steady-state depressurizing degree. (JP-A-1-258772
Publication).

【0003】[0003]

【発明が解決しようとする課題】しかしながらの方法
は塗布開始時及びウエブの接合時における厚塗り,スジ
故障の発生防止には役に立つが、定常時の高速化塗布に
は役に立たず、もし平常時もその様な電圧をかけるとハ
ジキ故障が発生する等の問題点があった。又の方法は
定常時におけるハジキ故障防止には役に立つが、塗布開
始時,接合部分のような非定常部に必要な高い帯電量を
付与すると定常部のスジ・ムラ故障が発生しやすく、逆
に定常部のスジ・ムラ故障を発生しない程度の低い帯電
量では非定常部の安定化に対し不充分であった。更に又
の方法は定常時に達する一定帯電電位で帯電させるた
め、塗り付け時及び接合通過時の均一化には、減圧度を
定常減圧度以上に一定時間保って対処している。
However, this method is useful for preventing the occurrence of thick coating and streak failure at the start of coating and at the time of joining the web, but it is not useful for high-speed coating at a steady state. When such a voltage is applied, there is a problem that a repelling failure occurs. The other method is useful for preventing cissing at the time of steady state. However, when the required high charge is applied to the unsteady part such as the joint at the start of coating, the streak and unevenness of the steady part tends to occur. If the charge amount was low enough not to cause streak and unevenness failure in the steady part, it was insufficient for stabilizing the unsteady part. Further, in the other method, since charging is performed at a constant charging potential which is reached at the time of steady state, uniformity during coating and passing through the joint is dealt with by keeping the degree of decompression higher than the degree of decompression for a certain period of time.

【0004】本発明の目的は上記諸方法の問題点を解消
し、塗布開始時及びウエブの接合時における厚塗り,ス
ジ故障の発生をなくし、且定常時もスジ・ムラ・ハジキ
故障等の発生なく、均一なる生産を高速で可能な塗布方
法を提供することにある。
[0004] An object of the present invention is to eliminate the problems of the above-mentioned various methods, to eliminate the occurrence of thick coating and streak failure at the start of coating and at the time of joining the web, and to cause the occurrence of streak, unevenness, cissing and the like even in a steady state. It is another object of the present invention to provide a coating method capable of performing uniform production at high speed.

【0005】[0005]

【課題を解決するための手段及び作用】本発明の上記目
的は、高速で連続的に長尺帯状支持体の表面に帯電させ
た後、塗布液をビードを形成して塗布する方法におい
て、塗布開始時及びウエブの接合通過時における前記帯
電量を定常塗布時の帯電量よりも高くすることを特徴と
する塗布方法によって達成される。
SUMMARY OF THE INVENTION The object of the present invention is to provide a method for forming a bead by applying a coating solution after charging the surface of a long strip-shaped support continuously at a high speed. This is achieved by a coating method characterized in that the charge amount at the start and when the web passes through the bonding is higher than the charge amount at the time of steady application.

【0006】本発明において高速で連続的に塗布するに
は、ウエブの接合ケ所を多く必要とする。その為接合ケ
所の下流に当る部分の厚塗り,スジ故障は出来る限り短
くさせることが得率上必要である。本発明において、塗
布開始時及びウエブの接合通過時における帯電量を定常
塗布時の帯電量よりも高くするということは、具体的に
は塗布開始時及びウエブの接合通過時には帯電量を1K
V以上,定常部においては0.1〜0.5KVにすると
いうことである。塗布開始時及びウエブの接合通過時に
1KV以上というのは厚塗り率(厚塗り部分の塗布量/
平常部分の塗布量)を130%以下に押えるために必要
であり、その上限としては火花放電を発生しない程度迄
上昇せしめることが好ましい。又定常部における0.1
〜0.5KVということは0.1KV以下ではハジキ故
障を発生し易く、0.5KV以上だ帯電ムラが塗布ムラ
として発生しやすいからである。
[0006] In the present invention, continuous application at a high speed requires a large number of web joining points. Therefore, it is necessary to shorten the thick coating and the streak failure of the portion corresponding to the downstream of the joining point as short as possible. In the present invention, the fact that the charge amount at the start of coating and at the time of passing through the bonding of the web is higher than the charge amount at the time of steady coating means that, specifically, at the start of coating and at the time of passing through the bonding of the web, the charging amount is 1K.
V or more, that is, 0.1 to 0.5 KV in the steady portion. The value of 1 KV or more at the start of coating and at the time when the web has passed through the joint means that the thick coating rate (the coating amount of the thick coating portion /
It is necessary to keep the amount of coating in a normal part) to 130% or less, and the upper limit is preferably raised to such an extent that spark discharge does not occur. Also, 0.1
The value of 0.5 KV means that a repelling failure easily occurs at 0.1 KV or less, and charging unevenness at 0.5 KV or more easily occurs as coating unevenness.

【0007】本発明における帯電量の調節を塗布時間に
対する印加電圧で示すと図1の如く、塗布開始時及び接
合通過時には例えば8KVの印加電圧をかけてその時の
ウエブ帯電量としては1000Vになる。定常時は5K
Vの印加電圧をかけてウエブの帯電量が150Vになる
ということである。
In the present invention, the adjustment of the charge amount is shown by the applied voltage with respect to the coating time, as shown in FIG. 1, at the start of coating and at the time of passing through the junction, an applied voltage of, for example, 8 KV is applied and the web charge amount at that time becomes 1000 V. Normally 5K
This means that the charged amount of the web becomes 150 V when the applied voltage of V is applied.

【0008】本発明について更に説明すると、本発明に
おけるコロナ放電電極の材質としては金属、炭素繊維等
を用い、形状としては細線,ブラシ状,テイフエッジ
状,平板状などを用いることが出来る。その他、本発明
に使用される支持体としては、紙、プラスチックフィル
ム、レジンコーティッド紙、合成紙等が包含される。プ
ラスチックフィルムの材質は、例えば、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、ポリエチレンを初めとす
るポリオレフィンが代表的であり、片面又は両面ラミネ
ートしたものがある。しかしながら必ずしもこれらに限
定されない。又、「塗布液」とは、その用途に応じて種
々の液組成のものが含まれ、例えば、写真感光材料にお
けるような、感光乳剤層,下塗層,保護層,バック層等
の塗布液;磁気記録媒体におけるような磁性層,下塗
層,潤滑層,保護層,バック層等の塗布液;その他接着
剤層,着色層,防錆層等の塗布液が挙げられ、それら塗
布液は水溶性バインダー又は有機バインダーを含有して
成っている。支持体上へ前記の塗布液を付与する方法と
してはスライドコート,ローラビードコート,エクスト
ルージョンコート,カーテンコート等が利用出来、その
他の方法も可能である。
The present invention will be described in further detail. The material of the corona discharge electrode in the present invention may be metal, carbon fiber, or the like, and the shape may be a thin wire, brush, tough edge, flat plate, or the like. In addition, examples of the support used in the present invention include paper, plastic film, resin-coated paper, and synthetic paper. The material of the plastic film is, for example, polyethylene,
Polyolefins such as polypropylene, polyvinyl acetate,
Vinyl polymers such as polyvinyl chloride and polystyrene, 6,
Polyamides such as 6-nylon and 6-nylon, polyesters such as polyethylene terephthalate and polyethylene-2,6-naphthalate, polycarbonates, and cellulose acetates such as cellulose triacetate and cellulose diacetate are used. The resin used for the resin-coated paper is typically a polyolefin such as polyethylene, and may be one-sided or two-sided laminated. However, it is not necessarily limited to these. The term "coating solution" includes those having various liquid compositions depending on the intended use. For example, coating solutions for photosensitive emulsion layers, undercoat layers, protective layers, back layers, etc., as in photographic materials. Coating liquids for magnetic layers, undercoat layers, lubricating layers, protective layers, back layers, etc. as in magnetic recording media; and coating liquids for other adhesive layers, coloring layers, rust-preventive layers, etc .; It comprises a water-soluble binder or an organic binder. As a method of applying the coating liquid on the support, a slide coat, a roller bead coat, an extrusion coat, a curtain coat, or the like can be used, and other methods are also possible.

【0009】本発明の実施態様について図を用いて説明
する。図2において、塗布液6aは注液器1にポンプ2
によってキャビティ3に供給され、キャビティ3で塗布
幅一杯に広げられ、スロット4よりスライド面5に流さ
れ、同様にスライド面に流された同時に塗布される液6
bと重畳する関係で塗布液ビード8を形成し、バッキン
グローラ9に支持された支持体7の上に塗布されるが、
塗布開始時及び接合部分通過時には塗布液ビード8のウ
エブ7との接触時に通常より厚塗りを発生する傾向にな
るため、塗布前においてウエブ7を帯電部13でアース
ローラ12で支え、その表面に電極11を設置し高圧電
源15よりの電圧でコロナ放電を行なわしめ、ウエブ表
面への塗布液の接着力を強める。一方、注液器の塗布前
の部分を減圧ポンプ14で減圧にする減圧室10は塗布
速度の上昇に対し、塗布速度上昇のための一定の減圧を
行う。本発明は塗布開始時及びウエブの接合通過時にお
ける前記帯電量を定常塗布時の帯電量よりも高くするよ
うに電圧を変化させることを特徴とする塗布方法であ
る。
An embodiment of the present invention will be described with reference to the drawings. In FIG. 2, a coating liquid 6a is supplied to a liquid injector 1 by a pump 2
The liquid 6 is supplied to the cavity 3, is spread over the entire coating width in the cavity 3, flows from the slot 4 to the slide surface 5, and is also applied to the slide surface at the same time.
A coating liquid bead 8 is formed in a superimposed relationship with b, and is coated on the support 7 supported by the backing roller 9.
At the start of coating and at the time of passing through the joining portion, the coating liquid bead 8 tends to generate a thicker coating than usual at the time of contact with the web 7. The electrode 11 is installed, and corona discharge is performed at a voltage from the high-voltage power supply 15 to increase the adhesion of the coating solution to the web surface. On the other hand, the decompression chamber 10 for depressurizing the part before application of the liquid injector by the decompression pump 14 performs a constant decompression for increasing the application speed in response to the increase in the application speed. The present invention is a coating method characterized in that the voltage is changed so that the charge amount at the start of coating and when the web passes through the bonding is higher than the charge amount at the time of steady coating.

【0010】[0010]

【実施例】本発明の効果を明確にならしめるため1実施
例について説明する。但し本発明は本実施例に限られる
ものではない。塗布液として5%ゼラチン溶液で粘度2
0cpのものを、注液器より前記減圧室を有するスライ
ドビードコータにより塗布するに当り、減圧室の減圧度
は−50mmH2O一定に保ち、塗布速度150m/m
inと300m/minにおける、帯電量による塗布開
始時,定常時,接合通過時の塗布面状況について比較し
た。結果を表1に示す。
DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment will be described to clarify the effects of the present invention. However, the present invention is not limited to this embodiment. 5% gelatin solution as coating solution, viscosity 2
In applying the material having a pressure of 0 cp from a liquid injector to a slide bead coater having the above-described decompression chamber, the degree of decompression in the decompression chamber was kept constant at −50 mmH 2 O, and the application speed was 150 m / m.
The coating surface conditions at the start of coating, at the time of steady state, and at the time of passing through the bonding were compared depending on the charge amount at in and 300 m / min. Table 1 shows the results.

【0011】[0011]

【表1】 [Table 1]

【0012】表1に示すように塗布速度150m/mi
nにおいては塗布開始時の厚塗り率の変化が示される
が、塗布速度300m/minにおいては、塗布開始時
及び接合通過時は帯電量は1000V以上が好ましく、
平常時は約200Vが好ましく、帯電量の変化が望まれ
ることが明瞭である。
As shown in Table 1, the coating speed is 150 m / mi.
In the case of n, the change of the thick coating rate at the start of coating is shown. At a coating speed of 300 m / min, the charge amount is preferably 1000 V or more at the start of coating and at the time of passing through the joint.
In normal times, about 200 V is preferable, and it is clear that a change in the charge amount is desired.

【0013】[0013]

【発明の効果】本発明の塗布開始時と接合通過時の帯電
量を定常時の帯電量よりも高くさせる塗布方法により、
高速連続塗布時における塗布開始時及び接合通過時の厚
塗り、スジ故障,及び定常時のムラ,ハジキ故障等の発
生をなくし、均一なる生産を得率よく行うことが出来る
ようになった。
According to the coating method of the present invention in which the charge amount at the start of coating and at the time of passing through the joint is higher than the charge amount at steady state,
This eliminates the occurrence of thick coating, streak failure, unevenness during normal operation, and cissing failure at the start of coating and at the time of passing through bonding during high-speed continuous coating, and uniform production can be efficiently performed.

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

【図1】本発明の塗布方法の連続塗布時間に対する印加
電圧のかけ方の図表。
FIG. 1 is a chart showing how an applied voltage is applied to a continuous coating time in a coating method of the present invention.

【図2】本発明の塗布方法を実施する1実施例の塗布装
置の側面図。
FIG. 2 is a side view of a coating apparatus according to one embodiment for performing the coating method of the present invention.

【符号の説明】[Explanation of symbols]

1 注液器 2 ポンプ 3 キャビティ 4 スロット 5 スライド面 6a,6b 塗布液 7 支持体 8 塗布液ビード 9 バッキングローラ 10 減圧室 11 電極 12 アースローラ 13 帯電部 14 減圧ポンプ 15 高圧電源 DESCRIPTION OF SYMBOLS 1 Injector 2 Pump 3 Cavity 4 Slot 5 Slide surface 6a, 6b Coating liquid 7 Support 8 Coating liquid bead 9 Backing roller 10 Decompression chamber 11 Electrode 12 Earth roller 13 Charging part 14 Decompression pump 15 High pressure power supply

Claims (1)

(57)【特許請求の範囲】(57) [Claims] 【請求項1】 高速で連続的に走行する長尺帯状支持体
の表面に帯電させた後、塗布液をビードを形成して塗布
する方法において、塗布開始時及びウエブの接合通過時
における前記帯電量を定常塗布時の帯電量よりも高くす
ることを特徴とする塗布方法。
1. A method for applying a coating solution by forming a bead after charging the surface of a long strip-shaped support that runs continuously at a high speed, wherein the charging is performed at the start of coating and at the time of passing a web. A coating method characterized in that the amount is higher than the charge amount during steady application.
JP2413983A 1990-08-09 1990-12-26 Application method Expired - Lifetime JP2597237B2 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP2413983A JP2597237B2 (en) 1990-12-26 1990-12-26 Application method
US07/743,062 US5340616A (en) 1990-08-09 1991-08-09 A coating method using an electrified web and increased humidity

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2413983A JP2597237B2 (en) 1990-12-26 1990-12-26 Application method

Publications (2)

Publication Number Publication Date
JPH04225864A JPH04225864A (en) 1992-08-14
JP2597237B2 true JP2597237B2 (en) 1997-04-02

Family

ID=18522527

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2413983A Expired - Lifetime JP2597237B2 (en) 1990-08-09 1990-12-26 Application method

Country Status (1)

Country Link
JP (1) JP2597237B2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7927668B2 (en) 2005-04-12 2011-04-19 Toray Industries, Inc. Coater of electric insulating sheet and method for producing electric insulating sheet with coated film

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7927668B2 (en) 2005-04-12 2011-04-19 Toray Industries, Inc. Coater of electric insulating sheet and method for producing electric insulating sheet with coated film

Also Published As

Publication number Publication date
JPH04225864A (en) 1992-08-14

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