JPS60109132A - Manufacture of cathode ray tube - Google Patents

Abstract

PURPOSE:To shorten a drying time, save energy, and lower a coating temperature when drying a coating by making the radiant heat in the latter stage of a drying process lower than in its former stage and by making an air flow in its latter stage of a drying process lower than in its former stage and by making an air flow in its latter stage larger than in its former stage. CONSTITUTION:In the drying process, a coating 2 on the inner surface of a panel 1 is heated by a radiant heat from a far infrared heater 5 and at the same time a clean and low-humidity air 7 is sent to the panel 1 from a nozzle 6 to replace the vapor layers staying in the panel 1 by this low-humidity air 7 for drying the coating 2. At this time, the air 7 to be sent in is controlled so that its flow rate will be lower in the former stage of the drying process and higher in its latter stage. On the contrary, in the far infrared heater 5, its output is controlled so that the radiant heat will be higher in the former stage of the drying process and lower in its latter stage. In this way, it is possible to improve the drying efficiency of coating and shorten a great deal the drying time.

Description

【発明の詳細な説明】 産業上の利用分野 本発明は、陰極線管の製法、特にカラー螢光面を形成す
る際の、パネル内面に塗布した塗膜の乾燥法に関するも
のである。DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a method for manufacturing cathode ray tubes, and particularly to a method for drying a coating film applied to the inner surface of the panel when forming a color fluorescent surface.

背景技術とその問題点 ３ｉｉ當、カラー陰極線管における螢光面、例えば赤、
緑及び青の各色螢光体ストライプ間に黒色スＩ−ライブ
（光吸収１ｍ）を形成したストライプ型のカラー螢光面
は次のようにして形成される。先゛Ｊ゛陰極線管のパネ
ル内面にｐｖ八へ光険を塗布し、乾燥後、色選択？１ｔ
４！ｊを光学用マスクとして、紫外線露光し、水洗等で
現像処理して各色に対応した位置にストライプ状のレジ
スＨ？Ｗを形成する。次にレジス）Ｊｔ”ｆを含む全面
にカーボンスラリーを塗布し、乾燥後、レジスト層と共
にその」二のカーボン層をリフトオンし、所定パターン
のカーボンストライプ即し黒色ストライプを形成する。BACKGROUND ART AND PROBLEMS 3ii The fluorescent surface in a color cathode ray tube, for example
A striped color phosphor surface in which black stripes (light absorption 1 m) are formed between green and blue phosphor stripes is formed as follows. First, apply PV8 to the inner surface of the panel of the J cathode ray tube, and after drying, select the color. 1t
4! Using j as an optical mask, expose to ultraviolet rays, wash with water, develop, etc., and form striped resists H? at positions corresponding to each color. Form W. Next, a carbon slurry is applied to the entire surface including the resist Jt"f, and after drying, the second carbon layer is lifted on together with the resist layer to form a predetermined pattern of carbon stripes, that is, black stripes.

しかる後、例えば緑色の螢光体スラリーを塗布し、乾燥
後、色選択電極を介して露光し、現像処理して所定のカ
ーボンストライブ間の所謂白抜き部分に緑色螢光体スト
ライブを形成し、以下同様にして夫々他の白抜き部分に
青色及び赤色螢光体ストライプを形成してト１的のカラ
ー螢光面が形成される。After that, for example, a green phosphor slurry is applied, and after drying, it is exposed to light through a color selection electrode and developed to form green phosphor stripes in the so-called white areas between predetermined carbon stripes. Thereafter, blue and red phosphor stripes are formed in the other white areas in the same manner to form a complete color phosphor surface.

このようなｌ）　ＶΔ感光膜、カーボンスラリー及び螢
光体スラリー等の塗布、乾燥は、塗布機、叩う回転主軸
上に複数のパネル支持アームが放射状に設けられ、各ア
ーム先端のヘッド部にパネルが真空チャックされ、主軸
を中心に回動するアームの外周にスラリー注入手段及び
遠赤外線ヒータによる加熱手段が配されて成る塗布機に
よって行われる。Coating and drying of such l) VΔ photoresist film, carbon slurry, phosphor slurry, etc. is carried out using a coating machine, a plurality of panel support arms are provided radially on the beating rotating main shaft, and a head section at the tip of each arm is installed. The panel is vacuum chucked, and this is done using a coating machine that has a slurry injection means and a heating means using a far-infrared heater arranged around the outer periphery of an arm that rotates around a main shaft.

この塗布機では、主軸が１回転する間に、パネル内１１
に対する水洗い処理（露光後の現像処理を含む）、パネ
ル内面へのスラリーの注入、パネルを自転さ一ロ′Ｃパ
ネル内面に均一にスラリーを塗布すること（所謂ダンピ
ング処理）、パネル内の残余のスラリーの）１１．出（
所謂スラリーふり切り処理）さらに遠赤外線ヒータ加熱
による塗膜の乾燥処理等が行われる。そしてパネルは乾
燥終了後、塗４３機より露光台へ送られ、露光後は史に
次の塗布Ｉ現へ送られて他の所要スラリーの塗布、〈・
２燥がなされる。With this coating machine, 11 parts inside the panel are coated while the main shaft rotates once.
rinsing with water (including development after exposure), injecting slurry into the inner surface of the panel, rotating the panel on its own axis and uniformly applying the slurry to the inner surface of the panel (so-called damping treatment), removing any remaining residue within the panel. of slurry)11. Out (
In addition, the coating film is dried by heating with a far-infrared heater (so-called slurry scraping treatment). After drying, the panel is sent from the coating machine to the exposure stand, and after exposure, it is sent to the next coating stage where other necessary slurry is applied.
2. Drying is done.

ところで、従来の遠赤外線ヒータのめを使用してｌ）　
Ｖ　Ａ感光膜、カーボンスラリー及び螢光体スラリー等
の塗膜を乾燥した場合には次の様な欠点あった。By the way, using a conventional far-infrared heater
When coatings such as VA photosensitive films, carbon slurries, and phosphor slurries are dried, there are the following drawbacks.

すなわち、遠赤外線と−タのみの乾燥では、塗布の乾燥
時間を短縮することが出来ず、生産性の向上をｌｆｆ１
害していた。In other words, drying using only far infrared rays and infrared rays cannot shorten the drying time of coating, and it is difficult to improve productivity by lff1.
It was causing harm.

乾燥時の塗膜ｊｊ１！ＬＩｆｌｊが向（なり、例えばＰ
ＶＡ感光膜、螢光体スラリーなどの感光塗ｊ挨の場合に
は、１１１１反応を起し、いわゆる熱カブリが発生しや
すかった。またパネルの各点の熱容量が異なるために全
面を均一に乾燥さ・け・るごとか難しく、ある部分は熱
カブリ、ある部分は乾燥不足といった現象が発生しやす
く、同時に塗膜厚分布の不拘−及びビンボール等の乾燥
むらも発生しやすかった。Paint film jj1 when dry! LIflj is the direction (becomes, for example, P
In the case of photosensitive coatings such as VA photosensitive films and phosphor slurries, 1111 reactions occur and so-called thermal fog tends to occur. In addition, because the heat capacity of each point on the panel is different, it is difficult to dry the entire surface uniformly, which tends to cause heat fog in some areas and insufficient drying in other areas. - and uneven drying of bottles, etc. was also likely to occur.

またザイスの異なるパネル（肉厚の違いで熱容量が異な
るもの）の場合には同一の塗布機で処理するごとが％！
Ｉｆ　Ｌ、　＜生産計画の自由度が低くかった。In addition, in the case of panels with different sizes (those with different heat capacities due to differences in wall thickness), the rate of processing with the same coating machine is %!
If L, <The degree of freedom in production planning was low.

さらに、殺／４　’（（ｒ　、　４−ス燥後のパネルの
温度は例えば５０℃位あり、このため、次の露光台の室
温との差が大きく、パネルの冷却が一様でないまま露光
される。露光感度＆Ｊ感光塗映の温度に依存するため、
露光の結果が不安定となった。Furthermore, the temperature of the panel after drying is, for example, about 50°C, and therefore there is a large difference from the room temperature of the next exposure table, and the panel is exposed without being cooled uniformly. Because it depends on the exposure sensitivity & the temperature of the J-sensitivity coating,
The exposure result became unstable.

発明の目的 本発明は、上述の点に鑑み塗膜の乾燥工程において、乾
燥時間の短縮、省エネルギー及び塗膜温度の低温化等を
図り、生産性の向上を図った陰極線管の製法を提供する
ものである。Purpose of the Invention In view of the above points, the present invention provides a method for manufacturing a cathode ray tube that improves productivity by shortening the drying time, saving energy, and lowering the temperature of the coating film in the coating film drying process. It is something.

発明の概要 本発明は、陰極線管のパネル内面に塗布した塗）漠の乾
燥工程において、塗膜を輻射熱で加熱し、同時に空気を
送ってパネル内に滞留しζいる蒸気を空気と置換せしめ
、輻射熱を乾燥工程の前段より後段で小となし、空気の
流量を乾燥工程の前段より後段で大となして塗膜の乾燥
を行うようになす。SUMMARY OF THE INVENTION The present invention heats the coating film applied to the inner surface of the panel of a cathode ray tube with radiant heat during the drying process, and at the same time sends air to replace the vapor that remains inside the panel with air. The radiant heat is made smaller in the latter part of the drying process than in the former part, and the flow rate of air is made larger in the latter part of the drying process than in the former part to dry the paint film.

この発明では、塗１漠の乾燥時間が短縮され、生産性の
向上が図られ、また輻射熱の省エネルギー化も図られる
。また、乾燥後の塗膜温度が低くなりその後の露光処理
が安定となる。According to the present invention, the drying time of the coating is shortened, productivity is improved, and energy saving of radiant heat is also achieved. In addition, the temperature of the coating film after drying is low, and subsequent exposure processing becomes stable.

実施例 以丁、図面を参照して本発明の実施例について説明しよ
う。Embodiments Here, embodiments of the present invention will be described with reference to the drawings.

第１図においＣ，ｆｌ）は陰極線管のパネル、（２）は
パネルｆｉｌの内面に塗布された例えばＰＶＡ感光膜、
カーボンスラリー又は螢光体スラリー等の塗膜である。In FIG. 1, C, fl) is a cathode ray tube panel, (2) is a PVA photoresist film coated on the inner surface of the panel fil,
It is a coating film such as carbon slurry or fluorescent slurry.

（３）は塗布機におけるパネル支持アームのヘッド部で
あり、その吸盤（４）にパネル（１）が直空チャックさ
れている。このヘッド部（３）ば通當のように３　ｒｐ
ｍ〜２００ｒｐｍの回転数で自転される。また（５）は
塗布機の主軸の所定の回動位置にパネル（１）と対向す
るように配された加熱手段例えば遠赤外線ヒータである
。(3) is the head portion of the panel support arm in the coating machine, and the panel (1) is directly chucked in the suction cup (4). This head part (3) is like 3rp
It is rotated at a rotation speed of m to 200 rpm. Further, (5) is a heating means, such as a far-infrared heater, arranged at a predetermined rotational position of the main shaft of the coating machine so as to face the panel (1).

本発明におい゛（ば、乾燥工程において、パネル（１１
の内面の塗膜（２）を遠赤外線ヒータ（５）からの輻射
熱によって加ｉ；ｑｐ　４−ると同時に、パネル＋１１
に対してノズル（６）から清浄で低湿度の空気（７）を
送り込み、パネル（１）内にｉ？ｉ１ｆ留している蒸気
の層（塗膜（２）からの水蒸気を多く含んだ空気層）を
この低湿度の空気（７）と置換して塗膜（２）の乾燥を
行う。この場合、特に送り込む空気（７）は第２図の曲
線（Ｉ）で示すようにその流ｌ；ｔ　（図は流速で表し
ている）が乾燥工程の前段で小さく、後段において大と
なるように制御する。他方、遠赤外線ヒータ（５１にお
いては、これとは逆に第２図の曲線（ＩＩ）で示すよう
にその輻射熱が乾燥工程の前段で大きく、後段では小さ
くなるようにヒータ出力を制御する。In the present invention (for example, in the drying process, the panel (11
At the same time, the coating film (2) on the inner surface of the panel +11 is heated by radiant heat from the far-infrared heater (5).
Clean, low-humidity air (7) is sent from the nozzle (6) into the panel (1). i1F The remaining vapor layer (air layer containing a large amount of water vapor from the coating film (2)) is replaced with this low-humidity air (7) to dry the coating film (2). In this case, the flow of air (7) to be sent in, as shown by the curve (I) in Figure 2, is such that its flow l;t (the figure is expressed in flow velocity) is small in the first stage of the drying process and large in the second stage. to control. On the other hand, in the far-infrared heater (51), on the contrary, the heater output is controlled so that the radiant heat is large in the first stage of the drying process and becomes small in the latter stage, as shown by curve (II) in FIG.

ノズル（６）からの空気（所謂送風）（７）は、直接塗
１模（巧に吹きつジノるのではなく、上述したようにパ
ネル（１）内に／！１シ留している蒸気の層が新しい（
ｌ（ｆ！ｌＩ！度の空気と有’Ｊに置換できるように供
給しなりればならない。このため、ノズル（ム）として
はノズル（６）とパネル（１）のシール面とのなず角θ
がＯ′≦θ≦４５°の範囲内に入るように配置するを可
とする。The air (so-called blowing air) (7) from the nozzle (6) is directly applied (rather than being blown out skillfully), as mentioned above, it is the vapor that remains inside the panel (1). The layer is new (
It must be supplied in such a way that it can be replaced with air of 1 (f!lI! degree).For this reason, as a nozzle (mu), the connection between the nozzle (6) and the sealing surface of the panel (1) is angle θ
may be arranged so that O'≦θ≦45°.

ノズル（６）からの空気（７）の条件としては、所ＦＥ
Ｗクラス１０００Ｊａ−トの清／Ｉ）な空気（１１１）
ら０．５ｐｋシ」−の大きさのゴミが１立方フィート当
り１０００１１１ｒｌ以下含む空気）であり、且つその
温度範囲がｉｏ’ｃ〜８０℃、湿度範囲が１０％〜８０
％である。また空気（７）の流速はパネル（１）のサイ
ズに関係なく　０．１ｍ／　ｓｅｃ　”　Ｈ１ｍ／　ｓ
ｅ（の範囲内で乾燥工程の前段と後段とで可変する。The conditions for the air (7) from the nozzle (6) are as follows:
W class 1000 Ja-to's clean/I) air (111)
Air containing less than 1,000,111 rl per cubic foot of dust with a size of 0.5 pk and 1 cubic foot), and the temperature range is IO'C to 80 °C, and the humidity range is 10% to 80 °C.
%. Also, the flow velocity of air (7) is 0.1m/sec" H1m/s regardless of the size of panel (1).
It is variable within the range of e (in the first and second stages of the drying process.

具体例としてはクラス　ｌＯＯ以１・で温度２５℃、湿
度５０％の空気を用い得る。遠赤外線ピーク（５）のヒ
ータ出力は、Ｏ，ＬＫＷ〜３０１１の範囲内でパネル（
１］のサイズに応して夫々適宜選択し、ＪＪ−フ４．Ｓ
燥工４ｊ、！の１）；１段と後段で可変するようになす
。遠赤外線ヒータ（５）はそのパネル＋ｌ＋との距Ｉ４
１１Ｌをパネル（１）のサイズに応じて５０自〜２１）
（１０餞の範囲で選定する。As a specific example, air of class 1OO or lower, temperature of 25° C., and humidity of 50% can be used. The heater output of the far infrared peak (5) is within the range of O, LKW ~ 3011 when the panel (
1] according to the size of JJ-F4. S
Dryer 4j! 1): Make it variable between the first stage and the second stage. The far infrared heater (5) is at a distance of I4 from its panel +l+.
50 to 21) depending on the size of the panel (1) for 11L
(Select within a range of 10.

斯る塗膜の乾燥法によれば、遠赤外線ヒータ（５）によ
る加！ｉＡによっ′Ｃ塗膜（２）から水分の蒸発が行わ
れる。同時に新しい空気（７）を送り込んでその塗膜表
ｊｈ１蒸気層の」−の空気層を當に低蒸気圧に保つこと
により、表１ｉｊ恭気１留の水分が上の空気層に強制的
に拡散される。これが為に塗Ｍ（２１からの水分の蒸発
がより促進され塗膜（２）の乾燥速度が上がる。According to this method of drying the coating film, the drying method is performed using a far-infrared heater (5). Water is evaporated from the 'C coating film (2) by iA. At the same time, by feeding in new air (7) and keeping the air layer in the vapor layer on the surface of the coating film at a low vapor pressure, the water in the vapor layer in Table 1 is forced into the upper air layer. It will be spread. This further promotes the evaporation of water from the coating M (21) and increases the drying rate of the coating film (2).

因に、従来の遠赤外線ヒータのみの乾燥では塗膜温度を
高くすることで表面空気層への水分の蒸発を活発化させ
ている。そして表面空気層からその上の空気層への水分
の移動は自然拡散、対流にたよっている。このため、従
来の乾燥法では塗膜の乾燥速度はそれほど向上しない。Incidentally, in conventional drying using only far-infrared heaters, the evaporation of moisture into the surface air layer is activated by increasing the coating film temperature. The movement of moisture from the surface air layer to the air layer above it relies on natural diffusion and convection. For this reason, conventional drying methods do not significantly improve the drying speed of the coating film.

本法に用いる遠赤外線ヒータは従来の目的と異なり急激
な水づ）の蒸発のため塗膜温度が低下し、乾燥速度が極
度ｔこ低ドするのを防止する補助的な役目となる。The far-infrared heater used in this method has an auxiliary role, which is different from the conventional purpose, to prevent the coating film temperature from decreasing due to rapid evaporation of water and the drying rate from becoming extremely low.

このようにＡ・、法では、ヒータ加熱と送風との相乗効
果により従来に比し、塗膜の乾燥時間が約半減され、ま
た輻射熱のエネルギーも約半減された。As described above, in Method A, the drying time of the coating film was reduced by about half compared to the conventional method due to the synergistic effect of heater heating and air blowing, and the energy of radiant heat was also reduced by about half.

又、塗ＭＪ　？／！度が低くなるので、感光塗ｊ漠の場
合、１１１ｆ反応はなく熱カブリが先住しない。又、感
光塗膜が低温で乾燥されるために、乾燥後の露光台の室
温との差が小さく、従ってパネルが一様に冷却され、露
光の結果が安定する。さらに、同一塗布機でサイズの異
なるパネルの塗布１．乾燥が＋＋Ｊｆｉｌとなるので、
生産計画の白山度が上がる。Also, painted MJ? /! In the case of photosensitive coatings, there is no 111F reaction and thermal fog does not occur due to the low temperature. Furthermore, since the photosensitive coating film is dried at a low temperature, the difference between the drying temperature and the room temperature of the exposure stage is small, so that the panel is uniformly cooled and the exposure result is stable. Furthermore, coating of panels of different sizes with the same coating machine 1. Since drying becomes ++Jfil,
The quality of production planning increases.

発明の効果 上述した様に本発明によれば、塗１模を輻射熱で加！；
ツキし、同時に空気を送っ゛Ｃ塗膜面上の空気層を常に
低蒸気圧に保ち、しかも空気の流量及び輻射熱の関係を
前述条件に選ぶことにより、塗１１．．にの乾燥効率が
向上し、乾燥時間を人中に短縮することができる。同時
に塗膜温度の低？！＋＆化が図れるので、感光塗膜の場
合、熱カブリはなく、且フその後の露光を安定にする。Effects of the Invention As described above, according to the present invention, one coating is heated with radiant heat! ;
By keeping the air layer above the coating surface at a low vapor pressure at all times and by selecting the relationship between the air flow rate and radiant heat as described above, coating 11. ．． The drying efficiency is improved and the drying time can be shortened. Low coating film temperature at the same time? ! Since it is possible to achieve +&, there is no thermal fog in the case of photosensitive coatings, and subsequent exposure is stabilized.

また’１１１１１射熱の省エネルギー化が図られる。In addition, energy conservation of '11111 heat radiation is achieved.

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

第１図は本発明製法の説明に供する構成図、第２図は本
発明の説明に供する空気の流速及びヒータ出力の条件を
示す図である。 （１）はパネル、（２）は塗膜、（３）はパネル支持ア
ームのヘッド部、（５）はｊ）１（赤外線ヒータ、（６
）はノズル、（７）は空気である。FIG. 1 is a block diagram for explaining the manufacturing method of the present invention, and FIG. 2 is a diagram showing conditions of air flow rate and heater output for explaining the present invention. (1) is the panel, (2) is the coating film, (3) is the head of the panel support arm, (5) is j) 1 (infrared heater, (6)
) is a nozzle, and (7) is air.

Claims (1)

【特許請求の範囲】[Claims] 陰極線管のパネル内面に塗布した塗；模の乾燥工程にお
いて、前記塗膜を輻射熱で加熱し、同時に空気を送っ゛
ζ前記パネル内にｆｆ１Ｖ留し′ζいる蒸気を前記空気
と置換せしめ、前記輻射熱を乾燥工程の前段より後段で
小となし、前記空気の流量を前記乾燥工程の前段より後
段で大となして前記塗膜の乾燥を行うことを特徴とする
陰極線管のＪｉ’Ｊ法。In the drying process of the coating applied to the inner surface of the panel of the cathode ray tube, the coating film is heated with radiant heat, and at the same time air is sent to replace the vapor remaining at ff1V in the panel with the air, A Ji'J method for cathode ray tubes, characterized in that the radiant heat is made smaller in a later stage of the drying process than in the first stage, and the flow rate of the air is made larger in the latter part of the drying process than in the former stage to dry the coating film.