JP2930210B2 - Control method of coating film quality in continuous coated steel plate manufacturing equipment - Google Patents
Control method of coating film quality in continuous coated steel plate manufacturing equipmentInfo
- Publication number
- JP2930210B2 JP2930210B2 JP1043159A JP4315989A JP2930210B2 JP 2930210 B2 JP2930210 B2 JP 2930210B2 JP 1043159 A JP1043159 A JP 1043159A JP 4315989 A JP4315989 A JP 4315989A JP 2930210 B2 JP2930210 B2 JP 2930210B2
- Authority
- JP
- Japan
- Prior art keywords
- film thickness
- color difference
- baking
- temperature
- coating
- 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 - Fee Related
Links
Landscapes
- Application Of Or Painting With Fluid Materials (AREA)
- Coating Apparatus (AREA)
Description
【発明の詳細な説明】 〔産業上の利用分野〕 本発明は連続的に鋼板上に塗料を塗布乾燥焼付を行う
方法において、仕上った塗装鋼板の膜厚および色調を一
定に保つため、板温計、膜厚計および測色計からの信号
により総括的に塗膜品質の制御を行う技術に関する。DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a method of continuously applying a paint on a steel sheet and performing drying and baking, in order to maintain a constant film thickness and color tone of the finished coated steel sheet. The present invention relates to a technique for generally controlling the quality of a coating film based on signals from a meter, a film thickness meter, and a colorimeter.
従来、鋼板上に塗料を塗布、乾燥焼付する技術とし
て、特開昭57−102265が開示されているが、本技術では
時間ロスが生じる他算出されたドライ膜厚が一定となっ
ても、下地鋼板、塗料中の顔料、焼付温度の変化により
塗装鋼板の色は一定とならず、不合格製品を生むことも
ある。Conventionally, as a technique of applying a paint on a steel sheet and drying and baking it, Japanese Patent Application Laid-Open No. 57-102265 is disclosed. The color of the coated steel sheet is not constant due to changes in the steel sheet, the pigment in the paint, and the baking temperature, which may result in rejected products.
また、特開昭61−230767のように、サンプリング値の
平均化を行い、平均値により同一の塗布量を制御する技
術では溶剤希釈率の変化によって仕上がり膜厚が変化す
ることになるほか、上記特開昭57−102265の技術と同様
の変化要素も考えられるので有効な手段とは云い難い。Also, as in JP-A-61-230767, in the technique of averaging the sampling values and controlling the same coating amount by the average value, the finished film thickness changes due to a change in the solvent dilution ratio. It is difficult to say that this is an effective means because the same change factors as in the technique of Japanese Patent Application Laid-Open No. 57-102265 can be considered.
塗装鋼板における品質は、膜厚のみならず色差も主要
な管理要素であることを考慮し、本発明では、従来監視
用として開発した測色計(例えば、「塗装工学」vo1.2
3.No6(1988))を用いて塗布量、焼付温度の制御目標
を変更することにより優れた品質と高い歩留りの塗装鋼
板を得ることを目的とする。Considering that the quality of the coated steel sheet is not only the film thickness but also the color difference as a major control factor, the present invention uses a colorimeter (for example, “Coating Engineering” vo1.2
3. No. 6 (1988)) to obtain coated steel sheets of excellent quality and high yield by changing the control target of coating amount and baking temperature.
本発明は、連続塗装鋼板製造装置における塗膜品質の
制御方法に関するものであって、走行する帯板表面に塗
料を塗布する塗装工程とこれを乾燥・焼付する工程とか
らなる塗装帯板製造方法において、 供給塗料の重量から塗装膜厚を測定する膜厚計によ
り膜厚を制御し、 前記乾燥・焼付炉出側に配置した板温計により板温
を制御し、 前記乾燥・焼付工程の出側に設置した側色計により
色差信号(ΔE、ΔL)を検出し、この該色差信号に従
って色差ΔLが上下管理限界外となったとき膜厚の制御
目標値を変更すると共に、色差ΔEが上限値を越えたと
き膜厚の測定値と目標値との大小及び板温の測定値と上
下管理限界値との大小に応じて焼付温度の制御目標値を
変更する ことを特徴とする。The present invention relates to a method for controlling the quality of a coating film in a continuous coated steel sheet manufacturing apparatus, which comprises a coating step of applying a paint to a running strip surface and a drying and baking step. In the above, the film thickness is controlled by a film thickness meter that measures the coating film thickness from the weight of the supplied paint, and the sheet temperature is controlled by a sheet thermometer disposed on the exit side of the drying and baking furnace. A color difference signal (ΔE, ΔL) is detected by a side color meter installed on the side, and when the color difference ΔL falls outside the upper and lower control limits according to the color difference signal, the control target value of the film thickness is changed and When the value is exceeded, the control target value of the baking temperature is changed according to the magnitude of the measured value of the film thickness and the target value and the magnitude of the measured value of the sheet temperature and the upper and lower control limit value.
色差信号に基づく操作は次の通りである。 The operation based on the color difference signal is as follows.
(1)標準と試料との色差ΔL いま、twを膜厚制御を行っている系(塗布量)への設
定信号とすると、ΔLの最小値ΔLmin、最大値ΔLmaxを
上下管理限界として次の操作を行う。(1) Color difference ΔL between standard and sample Now, assuming that tw is a setting signal to the system (coating amount) that controls the film thickness, the following operation is performed using the minimum value ΔLmin and the maximum value ΔLmax of ΔL as the upper and lower control limits. I do.
(a)ΔL<ΔLmin ときは twを上げる (b)ΔL>ΔLmax ときは twを下げる (2)色差ΔE ΔEの上限値をΔEmaxとし、ΔE>ΔEmaxのときは塗
装膜厚td、板温Tの測定値に応じて第1表に示す基準に
従い、焼付を行っている系の温度設定信号Toを決定す
る。(A) Increase tw when ΔL <ΔLmin (b) Decrease tw when ΔL> ΔLmax (2) Color difference ΔE The upper limit of ΔE is ΔEmax, and when ΔE> ΔEmax, the coating film thickness td and sheet temperature T The temperature setting signal To of the system performing the printing is determined according to the criteria shown in Table 1 according to the measured value.
第1表において、 td:大とは膜厚が目標より大きい場合 td:小とは膜厚が目標より小さい場合 T:大とは T>Tmax T:中とは Tmin≦T≦Tmax T:小とは T<Tmin を示すものである。但しTmax、Tminはそれぞれ板温の上
下管理限界値である。 In Table 1, td: large means that the film thickness is larger than the target. Td: small means that the film thickness is smaller than the target. T: large means T> Tmax T: medium means Tmin ≦ T ≦ Tmax T: small Indicates T <Tmin. Here, Tmax and Tmin are upper and lower control limit values of the sheet temperature, respectively.
色の評価は三刺激値、X,Y,Zにより行う。JIS(Z872
2)に規定されている定義は X=∫P(λ)(λ)ρ(λ)dλ /∫P(λ)(λ)d(λ) …(1) Y=∫P(λ)(λ)ρ(λ)dλ /∫P(λ)(λ)d(λ) …(2) X=∫P(λ)(λ)ρ(λ)dλ /∫P(λ)(λ)d(λ) …(3) ただし、 P(λ):光源のエネルギー分布 (ここではC光源の値を使用) (λ)、(λ)、(λ):等色関数 (ここでは2゜視野の値を使用) ρ(λ):測定物体の反射率 である。P(λ)、(λ)、(λ)、(λ)はJI
Sにすべて記載された値を使用するので、物体の反射率
ρ(λ)を測定すれば計算によりX、Y、Zを算出する
ことができる。ρ(λ)は入射光に対する反射光の割合
を分光して一定波長毎に求めれば良いが、入射角の影
響、反射光を完全に全部測定することの困難さから絶対
反射率の測定は容易ではない。そのため反射率既知の標
準反射板を基準として測定することが多い。基準標準反
射板としては国際的にBaSO4粉末を固めたものが使用さ
れ、グルム(Grum)らの値を使用するこが多い。The color is evaluated by tristimulus values, X, Y, and Z. JIS (Z872
The definition defined in 2) is as follows: X = ∫P (λ) (λ) ρ (λ) dλ / ∫P (λ) (λ) d (λ) (1) Y = ∫P (λ) (λ ) Ρ (λ) dλ / ∫P (λ) (λ) d (λ) (2) X = ∫P (λ) (λ) ρ (λ) dλ / ∫P (λ) (λ) d (λ (3) where P (λ): energy distribution of the light source (here, the value of the C light source is used) (λ), (λ), (λ): color matching function (here, the value of the 2 ゜ field of view is Used) ρ (λ): reflectance of the measurement object. P (λ), (λ), (λ), (λ) are JI
Since all the values described in S are used, X, Y, and Z can be calculated by measuring the reflectance ρ (λ) of the object. ρ (λ) may be obtained for each fixed wavelength by spectrally dividing the ratio of the reflected light to the incident light. However, it is easy to measure the absolute reflectance because of the influence of the incident angle and the difficulty in completely measuring the reflected light. is not. Therefore, the measurement is often performed with reference to a standard reflector having a known reflectance. As the reference standard reflector, a solidified BaSO 4 powder is used internationally, and the value of Grum et al. Is often used.
絶対値でのX,Y,Zにより厳密に色管理することは困難
なので、X,Y,Zを数値処理した色差ΔEが色管理のため
に使用される。Since it is difficult to strictly manage the color using the absolute values of X, Y, and Z, a color difference ΔE obtained by numerically processing X, Y, and Z is used for color management.
例えば実用的に良く使用されるハンター(Hunter)の
色差について述べる。For example, the color difference of a hunter that is often used practically will be described.
ハンターの色差は 色差ΔEは標準の試料との差ΔL、Δa、Δbを求め、
次の式によって求める。Hunter's color difference The color difference ΔE is obtained by calculating differences ΔL, Δa, and Δb from the standard sample,
It is determined by the following equation.
本発明では、ΔLの上下限を定めて膜厚制御系を調整
し、一方、ΔEが限界を越えた時は膜厚および乾燥炉出
側温度レベルにより、基準に従って焼付温度の制御目標
温度を上下する。 In the present invention, the upper and lower limits of ΔL are determined and the film thickness control system is adjusted. On the other hand, when ΔE exceeds the limit, the control target temperature of the baking temperature is raised or lowered in accordance with the standard according to the film thickness and the drying furnace outlet temperature level. I do.
第1図は本発明方法の実施例を示すブロック図であ
る。帯板1は塗装装置2によって塗料を塗布されオーブ
ン3内で加熱、乾燥される。FIG. 1 is a block diagram showing an embodiment of the method of the present invention. The strip 1 is coated with a paint by a coating device 2 and is heated and dried in an oven 3.
塗装装置は、塗料槽5から塗料ポンプ6によってピッ
クアップロール7に塗料を供給し、ピックアップロール
7はアプリケータロール8を介して帯板1の表面に塗料
を塗布する。塗膜の厚さはピックアップロール7のアプ
リケータロール8の接触圧を調整する調整機28によって
調整される。The coating device supplies the paint to the pickup roll 7 from the paint tank 5 by the paint pump 6, and the pickup roll 7 applies the paint to the surface of the strip 1 via the applicator roll 8. The thickness of the coating film is adjusted by an adjusting device 28 for adjusting the contact pressure of the applicator roll 8 of the pickup roll 7.
オーブン3には熱風送入管26から供給された熱風を吹
付ける熱風ノズル4が備えられている。The oven 3 is provided with a hot-air nozzle 4 for blowing hot air supplied from a hot-air inlet pipe 26.
塗料の塗布量計11は塗料タンク5に取付けている。こ
れは重量法であって重量変化を積分値で取出している。
塗布量はピックアップロール7の押付圧とピックアップ
ロールの回転数により一次的に制御される。The paint application meter 11 is attached to the paint tank 5. This is a gravimetric method, and the change in weight is taken out as an integral value.
The amount of application is primarily controlled by the pressing pressure of the pickup roll 7 and the number of rotations of the pickup roll.
次に焼付温計13はオーブン3の出側に取付けられてい
る。板温計13にて検出した板温を目標板温に一致させる
ために、オーブン3の最終ゾーンに吹込む熱風の温度を
変化させる。この制御は熱風温度調節計22の設定点を変
更する形で行われる。Next, the baking thermometer 13 is attached to the outlet side of the oven 3. In order to make the plate temperature detected by the plate thermometer 13 coincide with the target plate temperature, the temperature of the hot air blown into the final zone of the oven 3 is changed. This control is performed by changing the set point of the hot air temperature controller 22.
本発明は、塗料塗布量、板温度を一次的に制御するこ
とに止まらず、塗装鋼板の最終目標である膜圧と色差を
一定値内に制御することにある。このために乾燥膜厚計
14と測定計15を冷却以降に取付ける。The present invention is not limited to the primary control of the coating amount and the plate temperature, but is to control the film pressure and the color difference, which are the final targets of the coated steel plate, within certain values. Dry film thickness meter
Attach 14 and meter 15 after cooling.
膜厚計14の出力信号と測色計15の出力信号は別途設置
された比較回路25を経て塗布制御計21と熱風温度制御計
22のカスケード制御系の設定信号として各々に出力され
る。The output signal of the film thickness meter 14 and the output signal of the colorimeter 15 pass through a separately installed comparison circuit 25 and a coating controller 21 and a hot air temperature controller.
These are output as setting signals for the 22 cascade control systems.
鋼板に塗布している一つの塗料について (1)膜厚が変化した場合のΔL (2)焼付温度が変化した場合のΔE の測色計の出力を第2図、第3図に示す。 FIGS. 2 and 3 show the output of a colorimeter for ΔL 1 when the film thickness changes and (2) when the baking temperature changes for one paint applied to the steel sheet.
この場合、管理すべき上下限を設けておき、この上下
限に対して、例えば次のように目標値の変更を行う。In this case, upper and lower limits to be managed are set, and the target value is changed with respect to the upper and lower limits, for example, as follows.
(イ)ΔLが低くなれば膜厚制御を行っている系への設
定信号を上げる。(B) If ΔL decreases, the setting signal for the system that controls the film thickness is increased.
(ロ)ΔEが高くなれば焼付温度を行っている系への設
定信号を上げる。(B) If ΔE becomes high, the setting signal for the system that performs the printing temperature is raised.
ここでは、(イ)、(ロ)に簡易な管理基準の一例を
示したがさらに、ΔL、ΔEに対する膜厚、焼付温度の
特性を調べて前記第1表のような管理基準を作成し、こ
れに従って設定を変更するとよい。Here, (a) and (b) show an example of a simple control standard. Further, the characteristics of the film thickness and the printing temperature with respect to ΔL and ΔE are examined, and the control standard as shown in Table 1 is created. You may change the settings accordingly.
以上の結果、塗装膜厚と焼付温度に起因する塗装色の
変動は皆無となり、良好な品質の製品を得ている。As a result, there is no change in the coating color due to the coating film thickness and the baking temperature, and a good quality product is obtained.
本発明方法によれば、色差信号に従って膜厚、焼付温
度の目標値を上下し、帯板の最終的な塗膜品質を管理す
るので、均一な色調の帯板を得ることが可能となった。According to the method of the present invention, the target values of the film thickness and the baking temperature are raised and lowered according to the color difference signal, and the final coating film quality of the strip is controlled, so that a strip having a uniform color tone can be obtained. .
第1図は本発明の実施例の全体フローシート、第2図は
膜厚と色差信号ΔLとの関係を示すグラブ、第3図は、
焼付温度と色差ΔEとの関係を示すグラフである。 1……帯板 2……塗装装置 3……オーブン 4……熱風ノズル 5……塗料槽 6……塗料ポンプ 7……ピックアップロール 8……アプリケータロール 11……塗布量計 12……熱風温度計 13……板温計 14……膜厚計 15……測色計 21……塗布量制御計 22……熱風温度制御計 23……色差調節計 24……膜厚調節計 25……比較回路 26……熱風送入管 27……調整弁 28……ピックアップロール調整機FIG. 1 is an overall flow sheet of an embodiment of the present invention, FIG. 2 is a grab showing a relationship between a film thickness and a color difference signal ΔL, and FIG.
5 is a graph showing a relationship between a printing temperature and a color difference ΔE. DESCRIPTION OF SYMBOLS 1 ... Strip board 2 ... Coating device 3 ... Oven 4 ... Hot air nozzle 5 ... Paint tank 6 ... Paint pump 7 ... Pickup roll 8 ... Applicator roll 11 ... Coating amount meter 12 ... Hot air Thermometer 13 Plate thermometer 14 Film thickness meter 15 Colorimeter 21 Coating amount controller 22 Hot air temperature controller 23 Color difference controller 24 Film thickness controller 25 Comparison circuit 26 Hot air inlet pipe 27 Adjustment valve 28 Pickup roll adjustment machine
Claims (1)
程とこれを乾燥・焼付する工程とからなる塗装帯板製造
方法において、供給塗料の重量から塗装膜厚を測定する
膜厚計により膜厚を制御し、前記乾燥・焼付炉出側に配
置した板温計により板温を制御し、前記乾燥・焼付工程
の後流に設置した測色計により色差ΔL、ΔEを検出
し、色差ΔLが上下管理限界外となったとき膜厚の制御
目標値を変更すると共に、色差ΔEが上限値を越えたと
き膜厚の測定値と目標値との大小及び板温の測定値と上
下管理限界値との大小に応じて焼付温度の制御目標値を
変更することを特徴とする連続塗装鋼板製造装置におけ
る塗膜品質の制御方法。In a method for producing a coated strip comprising a coating step of applying a paint to the surface of a running strip and a step of drying and baking it, a film thickness meter for measuring the coating thickness from the weight of the supplied paint. The film thickness is controlled, the sheet temperature is controlled by a sheet thermometer arranged on the exit side of the drying / baking furnace, and the color difference ΔL, ΔE is detected by a colorimeter installed downstream of the drying / baking step, and the color difference is detected. When ΔL is outside the upper and lower limits, the control target value of the film thickness is changed, and when the color difference ΔE exceeds the upper limit value, the magnitude of the measured value of the film thickness and the target value, and the measured value of the sheet temperature and the upper and lower control values. A method for controlling the quality of a coating film in a continuously coated steel sheet manufacturing apparatus, wherein a control target value of a baking temperature is changed according to a magnitude of a limit value.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1043159A JP2930210B2 (en) | 1989-02-27 | 1989-02-27 | Control method of coating film quality in continuous coated steel plate manufacturing equipment |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1043159A JP2930210B2 (en) | 1989-02-27 | 1989-02-27 | Control method of coating film quality in continuous coated steel plate manufacturing equipment |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH02222750A JPH02222750A (en) | 1990-09-05 |
JP2930210B2 true JP2930210B2 (en) | 1999-08-03 |
Family
ID=12656087
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP1043159A Expired - Fee Related JP2930210B2 (en) | 1989-02-27 | 1989-02-27 | Control method of coating film quality in continuous coated steel plate manufacturing equipment |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP2930210B2 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP3283445B2 (en) * | 1996-10-31 | 2002-05-20 | 日本ペイントマリン株式会社 | Coating method |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0615060B2 (en) * | 1986-06-30 | 1994-03-02 | 新日本製鐵株式会社 | Paint film control device for painted steel sheets |
-
1989
- 1989-02-27 JP JP1043159A patent/JP2930210B2/en not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
JPH02222750A (en) | 1990-09-05 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
AU2010251867B2 (en) | Methods and instruments for measurement of paint sample characteristics | |
US5377428A (en) | Temperature sensing dryer profile control | |
EP2406616B1 (en) | Apparatus and method for measuring properties of unstabilized moving sheets | |
JP2930210B2 (en) | Control method of coating film quality in continuous coated steel plate manufacturing equipment | |
CA2874197C (en) | Moisture measurement | |
US8299409B2 (en) | Fuzzy logic-based control of microwave dryers | |
US5066865A (en) | Single sided reflectance sensor for measuring select physical properties of a material using one or more wavelengths of radiation | |
JPH08196984A (en) | Method and apparatus for baking coated steel plate | |
JP3178498B2 (en) | Paper thickness control device of paper machine | |
JPS637870A (en) | Apparatus for controlling film on painted steel plate | |
JPS60238015A (en) | Control device for rolling temperature and sheet shape in hot rolling mill | |
KR100935915B1 (en) | Automatic control method of drying operation by near infrared ray at continuous coil coating line | |
JP3473366B2 (en) | Apparatus and method for producing coated steel sheet | |
JP2731831B2 (en) | Drying method of coated paper | |
JPH10239156A (en) | Color measuring equipment for painted steel plate | |
JP3407583B2 (en) | Apparatus and method for producing coated steel sheet | |
JPH10206238A (en) | Measuring method for temperature of paint film baking | |
JPH029471A (en) | Film thickness control device | |
JPH0241490A (en) | Control device of profile of paper thickness | |
JPH0219419B2 (en) | ||
KR20140115975A (en) | Method for coating non-uniform substrates | |
JPH10296174A (en) | Method for controlling baking temperature of coated metallic sheet | |
Iuchi | A method for simultaneous measurement of both temperature and emissivity, and its applications to steel processes | |
Rendueles et al. | Improvement in coating uniformity with an automatic neural setup system for air knives in a hot dip galvanising line | |
JPH08323282A (en) | Preparation of coated plated steel sheet |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
S531 | Written request for registration of change of domicile |
Free format text: JAPANESE INTERMEDIATE CODE: R313531 |
|
S533 | Written request for registration of change of name |
Free format text: JAPANESE INTERMEDIATE CODE: R313533 |
|
R350 | Written notification of registration of transfer |
Free format text: JAPANESE INTERMEDIATE CODE: R350 |
|
LAPS | Cancellation because of no payment of annual fees |