JP2543288B2 - Roller marker coating film thickness control method - Google Patents
Roller marker coating film thickness control methodInfo
- Publication number
- JP2543288B2 JP2543288B2 JP4132806A JP13280692A JP2543288B2 JP 2543288 B2 JP2543288 B2 JP 2543288B2 JP 4132806 A JP4132806 A JP 4132806A JP 13280692 A JP13280692 A JP 13280692A JP 2543288 B2 JP2543288 B2 JP 2543288B2
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- Japan
- Prior art keywords
- coating
- film thickness
- time
- roll
- coating film
- 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
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- Application Of Or Painting With Fluid Materials (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は、ローラーカーテンコー
タ塗膜厚制御方法に関するもので、特に常に一定の膜厚
を得られる塗膜厚制御方法を目的とする。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a roller curtain coater coating film thickness control method, and particularly to a coating film thickness control method capable of always obtaining a constant film thickness.
【０００２】[0002]
【従来の技術】塗装方式としてロールコータ方式が一般
的であるが、通常の塗装ラインによる塗膜厚制御方法は
以下のようである。中央ラインスピード速度変更指令が
ｉ／ｐされると、ロールコータ塗膜厚制御式に従ってロ
ール周速がラインスピードとともに変化し、一定の膜厚
を得られる制御方法となっている。ロールコータ塗装は
鋼板との接触塗装であるため上記制御方法で特に問題が
ない。〔ｉ／ｐ＝入力〕2. Description of the Related Art A roll coater method is generally used as a coating method, and a method for controlling a coating film thickness on a normal coating line is as follows. When the central line speed / speed change command is i / p, the roll peripheral speed changes with the line speed according to the roll coater coating film thickness control formula, so that a constant film thickness can be obtained. Since the roll coater coating is a contact coating with a steel sheet, there is no particular problem with the above control method. [I / p = input]
【０００３】[0003]
【発明が解決しようとする課題】ラインスピード加減速
時において塗膜厚を一定に保つためにローラーカーテン
の塗装ロール周速を変化させるが、コイルとの非接触塗
装方式であるため塗装ロール周速を変化させてから鋼板
上に塗膜厚が変化するまで約１〜３秒かかることが確認
されている。この膜厚の応答遅れは、鋼板上の塗膜厚上
に以下に示す大きな影響を及ぼす。 厚膜厚発生による未焼付部分の発生→コータ以降のロ
ールへの付着等 厚膜厚部分のワキ発生 膜厚不合部分の発生The peripheral speed of the coating roll of the roller curtain is changed in order to keep the coating thickness constant during line speed acceleration / deceleration, but the peripheral speed of the coating roll is changed by the non-contact coating method with the coil. It has been confirmed that it takes about 1 to 3 seconds until the coating film thickness changes on the steel sheet after the change. This film thickness response delay has a great influence on the thickness of the coating film on the steel sheet as described below. Generation of unbaked part due to generation of thick film → Adhesion to roll after coating, etc. Occurrence of crack in thick film part Occurrence of inconsistent film thickness
【０００４】[0004]
【課題を解決するための手段】本発明は従来技術の課題
を有利に解決するものであって、ローラーカーテンコー
タ塗装はコイルとの非接触塗装であるため、膜厚変更時
塗装ロール周速を変化させてから（ローラーカーテンコ
ータは塗装ロールの加減速にて膜厚変更）、鋼板上の膜
厚が変化するまでに一定の遅れ時間が生じる。応答遅れ
時間分だけ鋼板上は一定の膜厚（狙い膜厚）は得られ
ず、厚膜厚による未焼付部分の発生等コータ以降に悪影
響を及ぼすと考えられる。そこで本発明者らは、膜厚の
最適な制御方法の検討を行い、常に一定の膜厚を得られ
る制御方法として本発明を完成したものである。The present invention advantageously solves the problems of the prior art. Since the roller curtain coater coating is a non-contact coating with the coil, the peripheral speed of the coating roll is changed when the film thickness is changed. After the change (the roller curtain coater changes the film thickness by accelerating and decelerating the coating roll), a certain delay time occurs until the film thickness on the steel plate changes. A constant film thickness (target film thickness) cannot be obtained on the steel plate by the response delay time, and it is considered that the thick film thickness has an adverse effect on the coater and thereafter, such as generation of an unbaked portion. Therefore, the present inventors have studied the optimum control method of the film thickness, and have completed the present invention as a control method that can always obtain a constant film thickness.
【０００５】即ち、本発明は流下する塗装カーテンを通
過させて被塗装物に塗膜を形成するカーテンコーターの
塗膜厚制御方法において、コータのロール周速条件を変
化させてから一定時間遅らせてラインスピードを変化さ
せて塗膜厚を制御することを特徴とするローラーカーテ
ン塗膜厚制御方法を要旨とする。That is, according to the present invention, in a coating film thickness control method of a curtain coater for forming a coating film on an object to be coated by passing it through a flowing coating curtain, the roll peripheral speed condition of the coater is changed and then delayed for a certain period of time. A gist of a roller curtain coating film thickness control method is characterized in that a coating speed is controlled by changing a line speed.
【０００６】[0006]
【実施例】以下、図面に基づいて本発明を説明する。図
１は本説明の実施例を示す。コイル（鋼帯）９はブライ
ドルロール１を通り、デフレクタロール２とロールコー
タバックアップロール３とを介して焼付炉８を通る。焼
付炉８をコイル９が通過する前にローラーカーテンコー
タにて塗料が塗布される。ここに塗布される塗料は家電
向け（冷蔵庫外板、洗濯機等）に使用される高分子ポリ
エステル系のトップコート塗料で、加工性、耐汚染性、
接着性等に優れるものである。DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings. FIG. 1 shows an embodiment of the present description. The coil (steel strip) 9 passes through the bridle roll 1, and the deflector roll 2 and the roll coater backup roll 3 through the baking furnace 8. The paint is applied by a roller curtain coater before the coil 9 passes through the baking oven 8. The paint applied here is a high molecular polyester top coat paint used for home appliances (refrigerator outer plates, washing machines, etc.) and has good processability, stain resistance, and
It has excellent adhesiveness.
【０００７】塗料は泡排器７に供給されカーテン安定条
件に大きく寄与する微小気泡が取り除かれる。泡排器７
を通過した塗料はローラーカーテンコータ塗装機の２つ
のロールのうちドクターロール５上に供給される。塗装
ロール４とドクターロール５の間に溜まった塗料だまり
は、ロール間のギャップ部分を通過し塗装ロール下部に
設置された塗装ロールブレード６にてかきとられ塗料の
カーテンを形成し、カーテン中を通過するコイル（鋼
帯）９上に塗布される。コイル（鋼帯）９上に塗布され
る塗料１０の膜厚は、各塗料の物性値（比重、粘度）、
塗装ロール４とドクターロール５間のギャップ、ロール
の回転数、ラインスピードにて適宜調整される。The paint is supplied to the bubble ejector 7 to remove the minute bubbles that greatly contribute to the curtain stability condition. Bubble ejector 7
The paint that has passed through is supplied onto the doctor roll 5 of the two rolls of the roller curtain coater coater. The paint pool accumulated between the paint roll 4 and the doctor roll 5 passes through the gap between the rolls and is scraped off by the paint roll blade 6 installed at the lower part of the paint roll to form a curtain of paint. It is applied on the passing coil (steel strip) 9. The film thickness of the paint 10 applied on the coil (steel strip) 9 depends on the physical properties (specific gravity, viscosity) of each paint,
The gap between the coating roll 4 and the doctor roll 5, the rotational speed of the roll, and the line speed are appropriately adjusted.
【０００８】図２，３に今回ラインに使用される塗料に
おいて、ローラーカーテンコータ塗装ロール４の周速の
減少にともなうコイル（鋼帯）９上の膜厚の変動結果を
示した。図は横軸に時間、左縦軸には鋼板上のドライ膜
厚、右縦軸には塗装ロール４の周速の変動を示した。FIGS. 2 and 3 show the results of the variation in the film thickness on the coil (steel strip) 9 with the decrease in the peripheral speed of the roller curtain coater coating roll 4 in the coating material used in this line. In the figure, the horizontal axis shows time, the left vertical axis shows the dry film thickness on the steel plate, and the right vertical axis shows the fluctuation of the peripheral speed of the coating roll 4.
【０００９】図２において４０mpm で一定に保たれてい
た塗装ロール４を時間９ｓの時点で減速を開始し、約２
秒間かけて２７．５mpm まで減速した。鋼板上のドライ
膜厚は２５μｍにほぼ一定に保たれていたが、塗装ロー
ル４の周速が減少後１．５ｓ後に膜厚が減少してくるこ
とが確認された。In FIG. 2, the coating roll 4, which was kept constant at 40 mpm, started decelerating at the time of 9 s, and the
It slowed down to 27.5 mpm over a second. Although the dry film thickness on the steel plate was kept substantially constant at 25 μm, it was confirmed that the film thickness decreased 1.5 s after the peripheral speed of the coating roll 4 decreased.
【００１０】図３においては４８mpm で一定に保たれて
いた塗装ロール４を時間１０．５ｓの時点で減速を開始
し、約２．５ｓかけて２７．５mpm まで減速した。鋼板
上のドライ膜厚はほぼ２０μｍ前後で一定に保たれてい
たが、塗装ロール４の周速が減少後２．２ｓ後に膜厚が
減少してくることが確認された。図４は塗装ロール、塗
装ロールブレード、ブレードホルダー、鋼板の位置関係
を示した図である。In FIG. 3, the coating roll 4, which was kept constant at 48 mpm, started decelerating at the time of 10.5 s, and decelerated to 27.5 mpm in about 2.5 s. The dry film thickness on the steel sheet was kept constant at around 20 μm, but it was confirmed that the film thickness decreased after 2.2 s after the peripheral speed of the coating roll 4 decreased. FIG. 4 is a diagram showing the positional relationship among the coating roll, the coating roll blade, the blade holder, and the steel plate.
【００１１】上記図２，３で説明した、膜厚の応答遅れ
は図４に示す箇所を塗料が通過するために起こるもので
ある。塗装ロールより供給される塗料は、塗装ロールブ
レードによってかきとられる。ブレード８mmを通過後、
塗装ロールブレードホルダー傾斜面２７mm、垂直面４５
mmの距離を塗料は流れ伝わる。ブレードホルダー通過後
塗料はカーテンを形成し１５０mm下の鋼板上に塗布され
る。The film thickness response delay described with reference to FIGS. 2 and 3 occurs because the coating material passes through the portions shown in FIG. The paint supplied from the paint roll is scraped off by the paint roll blade. After passing the blade 8mm,
Paint roll blade holder inclined surface 27mm, vertical surface 45
Paint travels a distance of mm. After passing through the blade holder, the paint forms a curtain and is applied on a steel plate 150 mm below.
【００１２】膜厚の応答遅れ時間は、上記箇所の通過時
間によって算出することが可能である。 応答遅れ時間Ｔ＝ｔ1 ＋ｔ2 ＋ｔ3 ＋ｔ4 ……………
…………（１） ｔ1 ：ブレード刃（８mm）を通過する時間 ｔ2 ：ブレードホルダー傾斜面（２７mm）を通過する時
間 ｔ3 ：ブレードホルダー垂直面（４５mm）を通過する時
間 ｔ4 ：ブレードを離れて鋼板まで落下する時間The response delay time of the film thickness can be calculated by the passage time at the above-mentioned location. Response delay time T = t 1 + t 2 + t 3 + t 4 ……………
………… (1) t 1 : Time to pass blade blade (8 mm) t 2 : Time to pass blade holder inclined surface (27 mm) t 3 : Time to pass blade holder vertical surface (45 mm) t 4 : Time to leave the blade and fall to the steel plate
【００１３】式（１）中の時間は以下のモデルによって
算出を行った。垂直平面に塗布された塗料の流動速度は
塗布厚み、塗料粘度、塗料比重により求めることができ
る。今回、ローラーカーテンコータ塗料カーテン流量よ
りブレード面での塗料厚みを予測し、通過速度を求めｔ
1 ，ｔ2 ，ｔ3 の算出を行った。またカーテンの落下速
度はほぼ重力加速度にて落下すると考えｔ4 を求めた。The time in the equation (1) was calculated by the following model. The flow rate of the coating material applied on the vertical plane can be determined by the coating thickness, the coating material viscosity, and the coating material specific gravity. This time, the roller curtain coater paint curtain flow rate is used to predict the paint thickness on the blade surface, and the passing speed is calculated.
The calculation of 1 , t 2 , and t 3 was performed. Also, the falling velocity of the curtain was calculated to be t 4 because it was assumed that the curtain would fall due to gravitational acceleration.
【００１４】下記に算出に使用した式を記した。 外表からｘにある部分の塗料のたれ速度 Ｖ＝ρｇ（Ｘ2 −ｘ2 ）／（２η） ………………
…………（２） 単位時間、単位幅を通過する塗料流量 Ｑ＝Ｘ3 ρｇ／（３η） ………………
…………（３） 最外層（ｘ＝０）における塗料のたれ速度 ｖ0 ＝ρｇＸ2 ／（２η） ………………
…………（４） 傾斜角度α°での最外層塗料のたれ速度 ｖ′＝ρｇＸ2 sin α／（２η） ………………
…………（５） カーテン落下時間 ｖE ＝（２×ｇ×Ｎ＋ｖ0 2 ）1/2 ………………
…………（６） ブレードから鋼板間落下時間 ｔ4 ＝（ｖE −ｖ0 ）／ｇ ………………
…………（７） ただし記号は以下に記した通りである。 ρ：流体の密度（ｇ／cm2 ） ｇ：重力加減速（cm／ｓ
2 ） η：粘度（poise) Ｘ：塗布膜厚（cm） ｘ：外表からの距離（cm） Ｑ：流量（cm3 ／ｓ・c
m） Ｎ：ブレードホルダー最下点高さ（cm）The formulas used for the calculation are shown below. Dripping speed of the paint in the part at x from the external table V = ρg (X 2 −x 2 ) / (2η) ………………
………… (2) Paint flow rate that passes through unit time and unit width Q = X 3 ρg / (3η) ………………
………… (3) Paint dripping speed in the outermost layer (x = 0) v 0 = ρgX 2 / (2η) …………
………… (4) Velocity of the outermost layer paint at the inclination angle α ° v ′ ＝ ρgX 2 sin α / (2η) ………………
………… (5) Curtain fall time v E = (2 × g × N + v 0 2 ) 1/2 ………………
………… (6) Falling time from blade to steel plate t 4 = (v E −v 0 ) / g ………………
………… (7) However, the symbols are as described below. ρ: Density of fluid (g / cm 2 ) g: Acceleration / deceleration of gravity (cm / s)
2 ) η: Viscosity (poise) X: Coating thickness (cm) x: Distance from the outer surface (cm) Q: Flow rate (cm 3 / s ・ c)
m) N: Height of blade holder lowest point (cm)
【００１５】式（２）から式（７）に基づいて各部分で
の塗料流速を算出し、以下の式に従って応答遅れ時間を
求めた。 Ｔ＝ｔ1 ＋ｔ2 ＋ｔ3 ＋ｔ4 ＝ブレード垂直面／ｖ0 ＋ブレード傾斜面／ｖ′＋ｔ4
……（８）The paint flow velocity in each part was calculated based on the equations (2) to (7), and the response delay time was obtained according to the following equation. T = t 1 + t 2 + t 3 + t 4 = blade vertical surface / v 0 + blade inclined surface / v ′ + t 4
…… (8)
【００１６】また実測値と理論値には微妙に差があるた
め、補正係数αを乗じた。 補正応答遅れ時間Ｔ′＝αＴ α：補正係数（塗料によって変化する）Since there is a subtle difference between the measured value and the theoretical value, the correction coefficient α was multiplied. Corrected response delay time T ′ = αT α: Correction coefficient (changes depending on the paint)
【００１７】（実施例１） 前提条件 ｇ＝９８０ｍ／ｓ2 Ｎ＝１５０cm ρ＝１．２ｇ／cm2 実測値１．５ｓ ｖ0 ＝７．１cm／ｓ ｖ′＝４．７cm／ｓ ｔ1 ＝０．１ｓ ｔ2 ＝０．６ｓ ｔ3 ＝０．６ｓ ｔ4 ＝０．５ｓ Ｔ ＝１．８ｓ α ＝０．８３ Ｔ′＝１．５(Example 1) Prerequisites g = 980 m / s 2 N = 150 cm ρ = 1.2 g / cm 2 measured value 1.5 s v 0 = 7.1 cm / s v '= 4.7 cm / s t 1 = 0.1s t 2 = 0.6s t 3 = 0.6s t 4 = 0.5s T = 1.8s α = 0.83 T '= 1.5
【００１８】（実施例２） 前提条件 ｇ＝９８０ｍ／ｓ2 Ｎ＝１５０cm ρ＝０．９９ｇ／cm2 実測値２．２ｓ ｖ0 ＝５．８cm／ｓ ｖ′＝３．９cm／ｓ ｔ1 ＝０．２ｓ ｔ2 ＝０．７ｓ ｔ3 ＝０．８ｓ ｔ4 ＝０．５ｓ Ｔ ＝２．２ｓ α ＝１．０ Ｔ′＝２．２(Example 2) Prerequisites g = 980 m / s 2 N = 150 cm ρ = 0.99 g / cm 2 Actual value 2.2 s v 0 = 5.8 cm / s v ′ = 3.9 cm / s t 1 = 0.2s t 2 = 0.7s t 3 = 0.8s t 4 = 0.5s T = 2.2s α = 1.0 T '= 2.2
【００１９】[0019]
【発明の効果】以上説明した本発明によれば、所定の算
出式に従い膜厚応答遅れ時間を算出し、塗装ロール回転
数とラインスピードに時間差をもつ制御ができるように
なったことにより、常に一定の膜厚を得ることができ、
従来技術のもつ不都合を解決することが可能となった。According to the present invention described above, the film thickness response delay time is calculated according to a predetermined calculation formula, and it is possible to control the coating roll speed and the line speed with a time difference. It is possible to obtain a constant film thickness,
It has become possible to solve the disadvantages of the prior art.
【図１】本発明を実施するためのローラーカーテンコー
タ設備の概略図。FIG. 1 is a schematic diagram of a roller curtain coater facility for carrying out the present invention.
【図２】塗装ロール周速の減少にともなう塗膜厚の変動
結果を示す図。FIG. 2 is a view showing a result of a change in coating film thickness with a decrease in coating roll peripheral speed.
【図３】同じく塗装ロール周速の減少にともなう塗膜厚
の変動結果を示す図。FIG. 3 is a diagram showing a variation result of the coating film thickness with a decrease in the peripheral speed of the coating roll.
【図４】塗装ロール、塗装ロールブレード、ブレードホ
ルダー、鋼板の位置関係を示す図。FIG. 4 is a view showing a positional relationship among a coating roll, a coating roll blade, a blade holder, and a steel plate.
１ ブライドルロール ２ デフレクタロール ３ ロールコータバックアップロール ４ 塗装ロール ５ ドクターロール ６ 塗装ロールブレード ７ 泡排器 ８ 焼付炉 ９ コイル（鋼帯） １０ 塗料 1 Bridle Roll 2 Deflector Roll 3 Roll Coater Backup Roll 4 Coating Roll 5 Doctor Roll 6 Painting Roll Blade 7 Bubble Discharger 8 Baking Furnace 9 Coil (Steel Strip) 10 Paint
Claims (2)
装物に塗膜を形成するカーテンコーターの塗膜厚制御方
法において、コータのロール周速条件を変化させてから
下記に示す応答遅れ時間を遅らせてラインスピードを変
化させて塗膜厚を制御することを特徴とするローラーカ
ーテンコータ塗膜厚制御方法。 応答遅れ時間Ｔ＝ｔ1 ＋ｔ2 ＋ｔ3 ＋ｔ4 ｔ1 ：ブレード刃を通過する時間 ｔ2 ：ブレードホルダー傾斜面を通過する時間 ｔ3 ：ブレードホルダー垂直面を通過する時間 ｔ4 ：ブレードを離れて鋼板まで落下する時間1. A method for controlling a coating film thickness of a curtain coater, wherein a coating film is formed on an object to be coated by passing it through a flowing coating curten, and a response delay shown below is obtained after changing a roll peripheral speed condition of the coater. A roller curtain coater coating thickness control method, characterized in that the coating thickness is controlled by delaying the time and changing the line speed. Response delay time T = t 1 + t 2 + t 3 + t 4 t 1 : time for passing blade blade t 2 : time for passing blade holder inclined surface t 3 : time for passing blade holder vertical surface t 4 : leaving blade Falling time to steel plate
理論式と実測値との差を補正するために補正係数を乗じ
た値の時間を遅らせてラインスピードを変化させて塗膜
厚を制御することを特徴とするローラーカーテンコータ
塗膜制御方法。 補正応答遅れ時間Ｔ′＝αＴ α：補正係数2. The film thickness response delay calculation formula according to claim 1,
A roller curtain coater coating film control method, characterized in that the coating film thickness is controlled by delaying the time of a value obtained by multiplying a correction coefficient to correct the difference between the theoretical formula and the actually measured value to change the line speed. Correction response delay time T ′ = αT α: correction coefficient
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4132806A JP2543288B2 (en) | 1992-05-25 | 1992-05-25 | Roller marker coating film thickness control method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4132806A JP2543288B2 (en) | 1992-05-25 | 1992-05-25 | Roller marker coating film thickness control method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH05317796A JPH05317796A (en) | 1993-12-03 |
| JP2543288B2 true JP2543288B2 (en) | 1996-10-16 |
Family
ID=15090017
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4132806A Expired - Lifetime JP2543288B2 (en) | 1992-05-25 | 1992-05-25 | Roller marker coating film thickness control method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2543288B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100448467B1 (en) * | 2001-12-03 | 2004-09-13 | 일신화학공업 주식회사 | Coating Membrane Thickness Adjustment Apparatus of Agricultural Film |
-
1992
- 1992-05-25 JP JP4132806A patent/JP2543288B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH05317796A (en) | 1993-12-03 |
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