JPH10128205A - Coating material circulator of roll coater - Google Patents

Coating material circulator of roll coater

Info

Publication number
JPH10128205A
JPH10128205A JP28880096A JP28880096A JPH10128205A JP H10128205 A JPH10128205 A JP H10128205A JP 28880096 A JP28880096 A JP 28880096A JP 28880096 A JP28880096 A JP 28880096A JP H10128205 A JPH10128205 A JP H10128205A
Authority
JP
Japan
Prior art keywords
paint
coating material
temperature
solvent
heat exchanger
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.)
Pending
Application number
JP28880096A
Other languages
Japanese (ja)
Inventor
Yukihiko Noguchi
之彦 野口
Yoshitoshi Haruta
恵利 春田
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.)
Nippon Steel Corp
Original Assignee
Sumitomo Metal Industries 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 Sumitomo Metal Industries Ltd filed Critical Sumitomo Metal Industries Ltd
Priority to JP28880096A priority Critical patent/JPH10128205A/en
Publication of JPH10128205A publication Critical patent/JPH10128205A/en
Pending legal-status Critical Current

Links

Landscapes

  • Coating Apparatus (AREA)

Abstract

PROBLEM TO BE SOLVED: To stabilize the characteristics of a coating material and to execute film thickness coating with high accuracy by providing a coating material circulator of a roll coater with a nonvolatile residue controller for keeping the nonvolatile residue of the coating material constant and a coating material temp. controller for keeping the temp. of the coating material constant. SOLUTION: The nonvolatile residue controller 60 computes the nonvolatile residue of the coating material at the time when the temp. and viscosity of the coating material are detected from the detected temp. and viscosity and determines the difference in the nonvolatile residues between the resulted and measured nonvolatile residue and the separately already inputted target nonvolatile residue. The amt. of the coating material of a circulation tank is determined from the coating material level and the amts. of the coating materials in a supply pipe, coater pan and return pipe are added thereto to determine the total circulation amt. of the coating material. The amt. of the solvent to be added is computed from this total circulation amt. of the coating material and the difference in the nonvolatile residue and a solvent adding device 50 is operated. The coating material temp. controller 30 determines the deviation between the information on the coating material temp. from a coating material detecting means 25 and the set temp. set by a temp. setter 37 and controls a heat exchanger 22 in such a manner that this deviation is eliminated. As a result, the characteristics of the coating material are stabilized.

Description

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

【0001】[0001]

【発明の属する技術分野】本発明は塗装鋼板の製造分野
において用いられるロールコータによる塗装技術に関す
るものであり、詳しくは鋼帯への塗装に用いられるロー
ルコータの塗料循環装置に関する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coating technique using a roll coater used in the field of producing coated steel sheets, and more particularly to a paint circulation device for a roll coater used for coating a steel strip.

【0002】[0002]

【従来の技術】塗装鋼板は鋼帯に塗装を施したものであ
り、その為の塗装装置には、高速処理並びに表裏面同時
塗装が可能なロールコータが採用されている。図7は従
来のロールコータの原理図であり、ロールコータ100
は、コータパン101に溜めた塗料102を、ピックア
ップロール103でピックアップし、その塗料をミータ
リングロール104で平坦にし、アプリケータロール1
05を介して鋼帯106に塗布するものである。107
はバックアップロールであり、鋼帯106をアプリケー
タロール105に臨ませる案内ロールである。
2. Description of the Related Art A coated steel sheet is obtained by applying a coating to a steel strip, and a roll coater capable of high-speed processing and simultaneous coating on both sides is adopted as a coating apparatus for that purpose. FIG. 7 is a diagram showing the principle of a conventional roll coater.
Picks up the paint 102 stored in the coater pan 101 with a pickup roll 103, flattens the paint with a metering roll 104,
05 is applied to the steel strip 106. 107
Reference numeral denotes a backup roll, which is a guide roll for causing the steel strip 106 to face the applicator roll 105.

【0003】前記コータパン101に溜めた塗料102
の管理は極めて重要である。そこで、調合タンク111
において、購入塗料と溶剤とを攪拌機112で攪拌し、
供給ポンプ113で供給管114を介して循環タンク1
15へ塗料を送る。循環タンク115に溜めた塗料は、
コータパン101などの準備が完了した後、循環ポンプ
116によって供給管117を介して連続的にコータパ
ン101に送られ、ピップアップロール103でピック
アップされた分の残りの塗料は、オーバフローして戻し
管118によって循環タンク115に戻る。
The paint 102 stored in the coater pan 101
Management is extremely important. Therefore, the mixing tank 111
In, the purchased paint and the solvent are stirred by the stirrer 112,
Circulation tank 1 via supply pipe 114 with supply pump 113
Send paint to 15. The paint stored in the circulation tank 115 is
After the preparation of the coater pan 101 and the like is completed, the remaining paint that has been continuously sent to the coater pan 101 by the circulation pump 116 through the supply pipe 117 and picked up by the pip-up roll 103 overflows and returns to the return pipe 118. To return to the circulation tank 115.

【0004】前記供給管114,117に温度調節器1
21,122が介設され、循環タンク115に設けた測
温体123,供給管117の出口に設けた測温体12
4,コータパン101に設けた測温体125の温度情報
に基づいて制御装置126は循環タンク115並びにコ
ータパン101における塗料の温度を所定値に調整する
ようにしたものである。上記装置100は、3ロール
方式のロールコータで安定した塗装が行なえ、 塗料変更後の初期塗装時の塗膜厚不良が皆無となっ
た、という効果を発揮するものであるとされている。
A temperature controller 1 is connected to the supply pipes 114 and 117.
21 and 122 are provided, and the temperature measuring element 123 provided at the circulation tank 115 and the temperature measuring element 12 provided at the outlet of the supply pipe 117 are provided.
4. The control device 126 adjusts the temperature of the paint in the circulation tank 115 and the coater pan 101 to a predetermined value based on the temperature information of the temperature measuring element 125 provided in the coater pan 101. The apparatus 100 is said to exhibit the effect that stable coating can be performed with a roll coater of a three-roll system, and that there is no defective coating thickness at the initial coating after changing the coating.

【0005】[0005]

【発明が解決しようとする課題】塗料の粘度は、温度に
依存してるため塗料の温度を一定化することで塗装の安
定化を図ることはできる。しかし、近年の耐食性向上を
目的とした自動車用有機複層鋼板では耐食性、溶接性の
観点から、厳しい塗装膜厚精度を要求されており、上記
の温度管理だけでは十分な成果が得られないことが分か
った。
Since the viscosity of the paint depends on the temperature, it is possible to stabilize the paint by keeping the temperature of the paint constant. However, in recent years, organic multi-layer steel sheets for automobiles aimed at improving corrosion resistance are required to have strict coating film thickness accuracy from the viewpoint of corrosion resistance and weldability, and sufficient results cannot be obtained only by the above temperature control. I understood.

【0006】[0006]

【課題を解決するための手段】そこで、本発明者等は詳
細に検討を重ね、現実の装置では塗料と溶剤を混合して
から鋼帯に塗布するまでの間に、塗料から溶剤が待機中
に蒸発して塗料の不揮発残分の割合が変化し、結果とし
て塗料の特性が変化することを突き止めた。塗料の不揮
発残分を制御する必要性を感じ、種々試みた結果、不揮
発残分の制御と温度の制御とを組合わせることで塗料の
特性を一定に保つことのできることを見出すに至った。
Therefore, the present inventors have studied in detail, and in the actual apparatus, the solvent is waiting from the paint between the time when the paint and the solvent are mixed and applied to the steel strip. It was found that the ratio of the non-volatile residue of the paint changed and the properties of the paint changed as a result. I felt the need to control the non-volatile residue of the paint, and as a result of various attempts, came to find out that the characteristics of the paint could be kept constant by combining the control of the non-volatile residue and the control of the temperature.

【0007】具体的には、請求項1はコータパンに溜め
た塗料をロールを介して鋼帯に塗布し、コータパン内の
余剰塗料をオーバフローさせたのち戻し管で循環タンク
に戻し、この循環タンク内の塗料を供給管を介して前記
コータパンへ送ることで塗料を循環させるロールコータ
の塗料循環装置において、前記塗料の供給管の途中に熱
交換器を設け、この熱交換器の1次側供給管又は循環タ
ンクに溶剤を投入する溶剤添加装置を設け、循環タンク
に塗料のレベルを検知する塗料レベル検知手段を設け、
前記熱交換器の2次側供給管又はコータパンに塗料の温
度を検知する塗料温度検知手段並びに塗料の粘度を検知
する塗料粘度検知手段を設け、検知した塗料の温度及び
粘度からそのときの塗料の不揮発残分を演算し、得られ
た計測不揮発残分と別途入力済の目標不揮発残分との不
揮発残分差を求め、一方、前記塗料レベルから循環タン
クの塗料量を求め、これに供給管、コータパン並びに戻
し管内の塗料量を加えて塗料循環総量を求め、この塗料
循環総量と前記不揮発残分差とから塗料添加量を演算し
て、前記溶剤添加装置を作動させる不揮発残分制御装置
を溶剤添加装置に付設し、前記温度検知手段の温度情報
に基づいて前記熱交換器を制御して溶剤の添加された塗
料を所定の温度に調節する塗料温度制御装置を熱交換器
に付設したことを特徴とする。
More specifically, the first aspect of the present invention is to apply the paint stored in the coater pan to a steel strip via a roll, overflow the excess paint in the coater pan, and then return the excess paint to the circulation tank with a return pipe. In a paint circulating device of a roll coater that circulates paint by feeding paint to the coater pan through a supply pipe, a heat exchanger is provided in the middle of the paint supply pipe, and a primary supply pipe of the heat exchanger is provided. Or provide a solvent addition device to put the solvent in the circulation tank, provided a paint level detection means to detect the level of paint in the circulation tank,
A paint temperature detecting means for detecting the temperature of the paint and a paint viscosity detecting means for detecting the viscosity of the paint are provided on the secondary supply pipe or the coater pan of the heat exchanger, and the paint temperature and the viscosity of the paint are detected based on the detected paint temperature and viscosity. The non-volatile residue is calculated, and the non-volatile residue difference between the obtained measured non-volatile residue and the separately input target non-volatile residue is calculated. On the other hand, the paint amount in the circulation tank is obtained from the paint level, and the supply pipe is determined. Calculate the paint circulation amount from the paint circulation total amount and the nonvolatile residue difference by adding the paint amount in the coater pan and the return pipe, calculate the paint addition amount from the paint circulation total amount and the nonvolatile residue difference, and operate the solvent addition device. A paint temperature control device attached to the solvent adding device and controlling the heat exchanger based on the temperature information of the temperature detecting means to adjust the solvent-added paint to a predetermined temperature is attached to the heat exchanger. To And butterflies.

【0008】不揮発残分制御装置により塗料の不揮発残
分を一定にすることができ、塗料温度制御装置で不揮発
残分一定の塗料を所定の温度にすることができるため、
塗料の特性が安定し、精度の高い膜厚塗装が実施でき
る。
[0008] Since the nonvolatile residue control device can make the nonvolatile residue of the paint constant, and the paint temperature control device can make the paint with the fixed nonvolatile residue a predetermined temperature,
The characteristics of the paint are stable, and highly accurate film thickness coating can be performed.

【0009】請求項2は、請求項1記載のロールコータ
の塗料循環装置に、前回の溶剤添加から一定時間経過し
たことをもって次の添加を許可する添加タイミング制御
部を付設したことを特徴とする。上記の一定時間は、溶
剤添加装置により添加した溶剤が添加地点からコータパ
ンへ到達するに必要な時間またはそれ以上の時間であ
る。この様な一定時間をもたせることにより、不揮発残
分をより安定させることができ、なお良好な塗装を実施
することができる。
According to a second aspect of the present invention, the paint circulation device of the roll coater according to the first aspect further includes an addition timing control unit for permitting the next addition after a predetermined time has elapsed from the previous addition of the solvent. . The above-mentioned fixed time is a time required for the solvent added by the solvent addition device to reach the coater pan from the addition point or longer. By giving such a fixed time, the non-volatile residue can be further stabilized, and a good coating can be performed.

【0010】[0010]

【発明の実施の形態】本発明の実施の形態を添付図に基
づいて以下に説明する。なお、図面は符号の向きに見る
ものとする。図1は本発明に係るロールコータの原理図
であり、ロールコータの塗料循環装置1は、塗料調合タ
ンク2と、攪拌機3と、混合塗料を調合タンク2から次
の循環タンク4へ供給するための供給管5及び供給ポン
プ6と、循環タンク4に備えた塗料と溶剤の攪拌機7
と、塗料をコータパン10へ送る供給管11及びポンプ
12と、、コータパン10においてオーバフローした塗
料を循環タンク4へ戻す戻し管13と、コータパン10
の塗料をピックアップし鋼帯14に塗るピックアップロ
ール15及びアプリケータロール16と、後で詳しく述
べる塗料温度制御装置30と、溶剤添加装置50と、不
揮発残分制御装置60とからなる。
Embodiments of the present invention will be described below with reference to the accompanying drawings. The drawings should be viewed in the direction of reference numerals. FIG. 1 is a diagram showing the principle of a roll coater according to the present invention. A paint circulation device 1 for a roll coater supplies a paint mixing tank 2, a stirrer 3, and a mixed paint from the mixing tank 2 to the next circulation tank 4. Supply pipe 5 and supply pump 6, and paint and solvent stirrer 7 provided in circulation tank 4
A supply pipe 11 and a pump 12 for feeding paint to the coater pan 10; a return pipe 13 for returning paint overflowed in the coater pan 10 to the circulation tank 4;
A pick-up roll 15 and an applicator roll 16 for picking up the paint and applying it to the steel strip 14, a paint temperature control device 30, a solvent addition device 50, and a nonvolatile residue control device 60, which will be described in detail later.

【0011】前記循環タンク4は塗料レベル検知手段2
1を備え、この塗料レベル検知手段21はフロート式液
面計や超音波式液面計が好適であり、循環タンク4内の
塗料の液面レベルを検知するものである。前記供給管1
1は途中に熱交換器22を備えているため、この熱交換
器22を境にして塗料を熱交換器22に送る1次側供給
管23と、熱交換器22から塗料を導き出す2次側供給
管24とに区別する。熱交換器22はプレート式熱交換
器、二重管式熱交換器、多管式熱交換器のいづれであっ
てもよい。
The circulation tank 4 is provided with a paint level detecting means 2.
The paint level detecting means 21 is preferably a float type liquid level meter or an ultrasonic type liquid level meter, and detects the liquid level of the paint in the circulation tank 4. The supply pipe 1
1 is provided with a heat exchanger 22 in the middle thereof, so that the primary side supply pipe 23 for sending the paint to the heat exchanger 22 with the heat exchanger 22 as a boundary, and the secondary side for drawing the paint from the heat exchanger 22 It is distinguished from the supply pipe 24. The heat exchanger 22 may be any of a plate heat exchanger, a double tube heat exchanger, and a multi-tube heat exchanger.

【0012】この2次側供給管24の出口近傍に、塗料
温度検知手段25を備える。この塗料温度検知手段25
は、いわゆる温度計であり、熱電対、測温抵抗体が好適
であり、塗料の温度を測る手段である。更に、コータパ
ン10に塗料粘度検知手段26を備える。上記塗料温度
検知手段25並びに塗料粘度検知手段26は、鋼帯14
に塗布する直前の塗料の温度並びに粘度を測るものであ
るから、設置位置は、コータパン10若しくは2次側供
給管24の出口近傍のいづれかであればよい。
A paint temperature detecting means 25 is provided near the outlet of the secondary supply pipe 24. This paint temperature detecting means 25
Is a so-called thermometer, which is preferably a thermocouple or a resistance thermometer, and is a means for measuring the temperature of the paint. Further, the coater pan 10 is provided with a paint viscosity detecting means 26. The paint temperature detecting means 25 and the paint viscosity detecting means 26
Since the temperature and the viscosity of the paint immediately before being applied to the paint are measured, the installation position may be any position near the outlet of the coater pan 10 or the secondary supply pipe 24.

【0013】塗料温度制御装置30は、前記熱交換器2
2へ温水又は冷水を供給する温冷水供給管31と、熱交
換器22からの出側配管32から温水を温水タンク33
へ戻す温水戻し管34と、前記出側配管32から冷水を
排出する排水管35と、温水を循環するための温水ポン
プ36と、前記塗料温度検知手段25からの塗料温度情
報と温度設定器37で設定した設定温度との偏差を求
め、この偏差が無くなるように、熱交換器22を調節す
る温度コントローラ38とからなる。
The paint temperature control device 30 is provided with the heat exchanger 2
A hot / cold water supply pipe 31 for supplying hot or cold water to the heat exchanger 2 and a hot water tank 33 from an outlet pipe 32 from the heat exchanger 22.
Hot water return pipe 34, a drain pipe 35 for discharging cold water from the outlet pipe 32, a hot water pump 36 for circulating hot water, and paint temperature information and a temperature setting unit 37 from the paint temperature detecting means 25. And a temperature controller 38 which adjusts the heat exchanger 22 so as to eliminate the deviation.

【0014】具体的には、温度コントローラ38は、塗
料の温度が設定温度より高いときには、第1冷水バルブ
41を開け、第1温水バルブ42を閉じ、第2冷水バル
ブ43を開け、第1温水バルブ44を閉じることで、冷
水を熱交換器22に送り、排水管35を通じて排水す
る。熱交換器22で塗料を冷却するため、塗料の温度は
下がる。塗料温度と設定温度との温度差に応じて第1冷
水バルブ41又は第2冷水バルブ43の開度をPI(比
例・積分)制御やPID(比例・積分・微分)制御によ
り徐々に変化させることにより、塗料温度を設定温度に
近づけることができる。勿論、第1冷水バルブ41又は
第2冷水パルブ43をオン・オフ制御しても目的は達成
できる。
Specifically, when the temperature of the paint is higher than the set temperature, the temperature controller 38 opens the first cold water valve 41, closes the first hot water valve 42, opens the second cold water valve 43, and opens the first hot water valve. By closing the valve 44, the cold water is sent to the heat exchanger 22 and drained through the drain pipe 35. Since the paint is cooled by the heat exchanger 22, the temperature of the paint falls. The degree of opening of the first chilled water valve 41 or the second chilled water valve 43 is gradually changed by PI (proportional / integral) control or PID (proportional / integral / derivative) control according to the temperature difference between the paint temperature and the set temperature. Thereby, the paint temperature can be brought close to the set temperature. Of course, the object can also be achieved by controlling the first cold water valve 41 or the second cold water valve 43 to be on / off.

【0015】また、塗料の温度が設定温度より低いとき
には、第1冷水バルブ41を閉じ、第1温水バルブ42
を開け、第2冷水バルブ43を閉じ、第1温水バルブ4
4を開けることで、温水を熱交換器22に送り、温水戻
し管34を通じて温水タンク33へ戻す。熱交換器22
で塗料を加熱するため、塗料の温度は上がる。なお、温
度コントローラ38は温度センサ45で温水タンクの温
水の温度をモニターし、温度が下がったときには、バル
ブ46を開き、供給管47を介して温度の高い温水を供
給する。前記バルブ46と供給管47は、温水を直接暖
める電熱ヒータに替えてもよい。
When the temperature of the paint is lower than the set temperature, the first cold water valve 41 is closed and the first hot water valve 42 is closed.
, The second cold water valve 43 is closed, and the first hot water valve 4
By opening 4, hot water is sent to the heat exchanger 22 and returned to the hot water tank 33 through the hot water return pipe 34. Heat exchanger 22
, The temperature of the paint rises. The temperature controller 38 monitors the temperature of the hot water in the hot water tank with the temperature sensor 45, and when the temperature drops, opens the valve 46 and supplies high-temperature hot water via the supply pipe 47. The valve 46 and the supply pipe 47 may be replaced with an electric heater for directly warming hot water.

【0016】溶剤添加装置50は、溶剤容器51と、溶
剤供給管52と、溶剤バルブ53と、溶剤流量計54と
からなる。溶剤流量計54は面積式流量計、容積式流量
計などがある。
The solvent adding device 50 includes a solvent container 51, a solvent supply pipe 52, a solvent valve 53, and a solvent flow meter 54. The solvent flow meter 54 includes an area flow meter and a positive displacement flow meter.

【0017】不揮発残分制御装置60は、検知した塗料
の温度及び粘度からそのときの塗料の不揮発残分を演算
し、得られた計測不揮発残分と別途入力済の目標不揮発
残分との不揮発残分差を求め、一方、前記塗料レベルか
ら循環タンクの塗料量を求め、これに供給管、コータパ
ン並びに戻し管内の塗料量を加えて塗料循環総量を求
め、この塗料循環総量と不揮発残分差とから溶剤添加量
を演算して、溶剤添加装置50を作動させる不揮発残分
コントローラ61と、目標不揮発残分を打込むための目
標不揮発残分設定器62と、前回の溶剤添加から一定時
間経過したことをもって次の添加を許可する添加タイミ
ング制御部63とからなる。
The non-volatile residue controller 60 calculates the non-volatile residue of the paint from the detected temperature and viscosity of the paint, and calculates the non-volatile residue of the obtained measured non-volatile residue and the separately input target non-volatile residue. On the other hand, the amount of paint in the circulation tank is obtained from the above-mentioned paint level, and the amount of paint in the supply pipe, coater pan and return pipe is added thereto to obtain the total amount of paint circulation. , A non-volatile residue controller 61 for operating the solvent addition device 50, a target non-volatile residue setter 62 for driving in the non-volatile residue, and a certain time after the previous solvent addition. And the addition timing control unit 63 that permits the next addition.

【0018】以上の述べた不揮発残分制御装置の作用を
次に説明する。図2は本発明に係るロールコータの溶剤
添加フロー図であり、ST××はステップ番号を示す。 ST01:塗料の粘度をμ、塗料の温度をt、不揮発残
分をNVとしたときに、次の式が成り立つ。 NV=a・lnμ−b/(273+t)+c ここで、a、b、cは塗料毎の定数であり、対象となる
塗料のNV毎の粘度−温度データを採取し、回帰計算し
て予めテーブルを作っておく。これらのテーブルに基づ
いてST01では、塗料に応じた定数a、b、cを決定
する。 ST02:塗料に応じて目標NV(目標不揮発残分)を
読込む。この目標NVは図1の目標不揮発残分設定器6
2で予め打込んだ値である。
The operation of the above-described nonvolatile residue control device will now be described. FIG. 2 is a flow chart of the addition of a solvent to the roll coater according to the present invention, where STxx indicates step numbers. ST01: When the viscosity of the paint is μ, the temperature of the paint is t, and the non-volatile residue is NV, the following equation is established. NV = a · lnμ−b / (273 + t) + c Here, a, b, and c are constants for each paint, and viscosity-temperature data for each NV of the target paint is collected, regression-calculated, and stored in a table in advance. Make it. In ST01, constants a, b, and c corresponding to the paint are determined based on these tables. ST02: Read target NV (target non-volatile residue) according to the paint. This target NV is the target non-volatile residue setter 6 in FIG.
This is a value previously input at 2.

【0019】ST03:図1の添加タイミング制御部6
3にて、前回の溶剤添加からの経過時間Taddが最小
経過時間Ttime以上であるかを調べ、Yesであれ
ば次に進む。このステップを設けた理由は後述する。 ST04:図1の塗料粘度検知手段26及び塗料温度検
知手段25で塗料の粘度粘度μ及び塗料の温度tを読込
む。
ST03: Addition timing control section 6 in FIG.
At 3, it is checked whether the elapsed time Tadd from the previous solvent addition is equal to or longer than the minimum elapsed time Ttime. The reason for providing this step will be described later. ST04: The paint viscosity viscosity μ and the paint temperature t are read by the paint viscosity detecting means 26 and the paint temperature detecting means 25 in FIG.

【0020】ST05:粘度μ、塗料温度tから計測N
Vを求める。すなわち、計測NV=a・lnμ−b/
(273+t)+cである。 ST06:計測NVと目標NVとの差を求める。ただ
し、計測NVは目標NVより小さくない。両者の差が許
容差α以上のときに次に進む。 ST07:図1の塗料レベル検知手段21で循環タンク
4の塗料のレベルを知る。循環タンク4は単純な円筒タ
ンクであるとして、底面積をA、塗料の底からの高さを
Hとすれば、循環タンク内塗料の量q1はA・Hで求ま
る。
ST05: Measured from viscosity μ and paint temperature t N
Find V. That is, measurement NV = a · lnμ−b /
(273 + t) + c. ST06: Find the difference between the measured NV and the target NV. However, the measured NV is not smaller than the target NV. The process proceeds to the next step when the difference between the two is equal to or larger than the allowable difference α. ST07: The paint level in the circulation tank 4 is known by the paint level detecting means 21 in FIG. Assuming that the circulation tank 4 is a simple cylindrical tank and the bottom area is A and the height from the bottom of the paint is H, the amount q1 of paint in the circulation tank can be obtained by A · H.

【0021】ST08:コータパン10はオーバフロー
で塗料の底からの高さは一定であるから、コータパン1
0内塗料の量q2は一定値であり既知である。循環タン
ク4からコータパン10までの供給管11(熱交換器2
2の流路を含む。)の内容積は配管の模様替えや改造を
しない限り一定であり、供給管11内塗料の量q3も既
知である。従って、循環塗料総量Qはq1+q2+q3
で求めることができる。
ST08: Since the coater pan 10 overflows and the height from the bottom of the paint is constant, the coater pan 1
The amount q2 of the paint in 0 is a fixed value and is known. Supply pipe 11 from circulation tank 4 to coater pan 10 (heat exchanger 2
2 channels. The inner volume of () is constant unless the pipe is redesigned or modified, and the amount q3 of the paint in the supply pipe 11 is also known. Therefore, the circulating paint total amount Q is q1 + q2 + q3
Can be obtained by

【0022】ST09:溶剤添加量Pは、(計測NV−
目標NV)/目標NV×Qで簡単に求めることができ
る。 ST10:図1の溶剤バルブ53を開け、溶剤流量計5
4で量を計測し、その量がPに達したら溶剤バルブ53
を閉じる。 ST11:Taddを計測するタイマーをリセットし
て、カウントを開始する。 ST12:制御終了の命令がなければ、ST01に戻
り、あれば制御を終了する。
ST09: The solvent addition amount P is calculated as (measurement NV-
Target NV) / Target NV × Q can be easily obtained. ST10: Open the solvent valve 53 of FIG.
The amount is measured at 4 and when the amount reaches P, the solvent valve 53
Close. ST11: Reset the timer for measuring Tadd and start counting. ST12: If there is no command to end the control, the process returns to ST01, and if there is, the control is ended.

【0023】前記ST03を設けた理由、すなわち図1
において添加タイミング制御部63を設けた理由は次の
通りである。実施例の様に、循環タンク4に溶剤を添加
して攪拌器7で攪拌すると、溶剤と塗料とは短時間で新
たな不揮発残分条件となる。一方、コータパン10は前
の不揮発残分条件の塗料が溜まっているために、新たな
不揮発残分条件に置き換わるまでにはある時間が必要と
なり、この時間を滞留時間という。
The reason for providing ST03, that is, FIG.
The reason why the addition timing control unit 63 is provided in the above is as follows. When a solvent is added to the circulation tank 4 and stirred by the stirrer 7 as in the embodiment, the solvent and the coating material become new non-volatile residue conditions in a short time. On the other hand, the coater pan 10 has a certain amount of time before it is replaced with the new non-volatile residue condition because the paint under the previous non-volatile residue condition is accumulated, and this time is referred to as residence time.

【0024】この滞留時間は本発明の様に、熱交換器2
2の一次側において溶剤を添加し、溶剤添加後の塗料を
熱交換器22で温度調節して、コータパン10に供給す
る方式の装置においては、かならず発生するものであ
る。仮に、滞留時間以内で次の溶剤を添加したとする
と、古い情報で溶剤を添加したためコータパン10の塗
料の不揮発残分が目標不揮発残分よりも少なくなり、目
標不揮発残分になかなか近づかないという不具合が発生
する。そこで、一定時間(滞留時間)経過後に次の溶剤
添加を実施することが望ましい。
This residence time depends on the heat exchanger 2 as in the present invention.
In a device of the type in which a solvent is added on the primary side of the coating material 2 and the temperature of the coating material after the addition of the solvent is adjusted by the heat exchanger 22 and is supplied to the coater pan 10, this always occurs. If the next solvent is added within the residence time, the non-volatile residue of the paint of the coater pan 10 becomes smaller than the target non-volatile residue because the solvent is added based on the old information, and the target non-volatile residue is not easily approached. Occurs. Therefore, it is desirable to perform the next solvent addition after a certain time (residence time) has elapsed.

【0025】なお、循環塗料総量Qが100kg、循環
用のポンプ12の容量が10kg/minであれば、1
0min(分)で塗料が一巡する。そこで、一定時間
(滞留時間)は約10minに設定する。
If the circulating paint total amount Q is 100 kg and the capacity of the circulating pump 12 is 10 kg / min, 1
The paint makes one cycle in 0 min (minute). Therefore, the fixed time (residence time) is set to about 10 minutes.

【0026】[0026]

【実施例】本発明に係る実施例を次に説明するが、本発
明は実施例に限るものではない。図1に示した2ロール
式ロールコータ及び塗装循環装置を使用し、板厚0.3
〜2.3mm、幅600〜1600mmの鋼帯を60〜
130m/分で送りつつ、乾燥膜厚1.0μmの塗装を
実施した。
Embodiments of the present invention will be described below, but the present invention is not limited to the embodiments. Using the two-roll type roll coater and the coating circulation device shown in FIG.
~ 2.3mm, 600 ~ 1600mm wide steel strip 60 ~
The coating with a dry film thickness of 1.0 μm was performed while feeding at a rate of 130 m / min.

【0027】図3は塗料温度の経時変化を示すグラフで
あり、横軸は時間、縦軸は塗料温度である。塗装開始直
後から12時間分の塗料温度を図1の塗料温度検知手段
25により記録したものである。グラフ中、乱れている
箇所は、溶剤添加の影響によるものである。溶剤の添
加、鋼帯の寸法が変化し、雰囲気温度が変化したにも拘
らず、塗料温度は37.5±1.0℃の範囲であった。
FIG. 3 is a graph showing the change over time in the paint temperature. The horizontal axis represents time, and the vertical axis represents paint temperature. The paint temperature for 12 hours immediately after the start of painting is recorded by the paint temperature detecting means 25 in FIG. In the graph, the disordered portion is due to the influence of the addition of the solvent. The paint temperature was in the range of 37.5 ± 1.0 ° C., despite the addition of the solvent, the change in the dimensions of the steel strip, and the change in the ambient temperature.

【0028】図4は塗料粘度の経時変化を示すグラフで
あり、横軸は時間、縦軸は塗料粘度である。粘度の単位
はcps(センチポアズ)である。時間経過につれて塗
料の粘度が上り、目標NVから一定以上外れた時点で溶
剤を添加するため、添加直後に粘度が大きく下がる。こ
の下降は溶剤の投入速度が大きいほど顕著となるので、
溶剤を緩やかに投入すれば目立たなくなる。なお、目標
NVは受注内容から決定された塗装スケジュールに従っ
て低粘度側から高粘度側に僅かに変化させたため、緩い
右上り曲線になっている。12時間における粘度の範囲
は33〜38cpsであった。
FIG. 4 is a graph showing the time-dependent change in the viscosity of the coating composition. The horizontal axis represents time, and the vertical axis represents the coating viscosity. The unit of viscosity is cps (centipoise). As the time elapses, the viscosity of the paint increases, and the solvent is added at a point where the paint deviates from the target NV by a certain amount or more. This drop becomes more pronounced as the solvent injection speed increases,
If the solvent is introduced slowly, it becomes inconspicuous. Note that the target NV slightly changes from a low-viscosity side to a high-viscosity side in accordance with the coating schedule determined from the contents of the order, and thus has a gentle upper right curve. The range of viscosities at 12 hours was 33-38 cps.

【0029】図5は塗料温度と塗料粘度と不揮発残分と
の関係を調べたグラフである。なお、不揮発残分(N
V)は%で示す。図3から塗料温度37.5℃、図4か
ら33cps,38cpsを導き出し、図5にプロット
すると、37.5℃と33cpsとの交点はほぼNV=
15に相当し、37.5℃と38cpsとの交点はほぼ
NV=16に相当する。(16−15)/15を計算す
ると、0.067となる。目標不揮発残分に対し、6.
7%程度の影響が出ると考えられるが、乾燥塗膜厚さが
1.0μmであれば、0.067μmの膜厚変動に留ま
るので、非常に均一な厚さの塗膜が得られる。
FIG. 5 is a graph showing the relationship between the paint temperature, the paint viscosity, and the non-volatile residue. The non-volatile residue (N
V) is shown in%. A paint temperature of 37.5 ° C. is derived from FIG. 3 and 33 cps and 38 cps are derived from FIG. 4 and plotted in FIG. 5, where the intersection between 37.5 ° C. and 33 cps is almost NV =
The intersection of 37.5 ° C. and 38 cps corresponds to approximately NV = 16. Calculating (16-15) / 15 results in 0.067. 5. With respect to the target non-volatile residue
It is considered that the influence is about 7%. However, if the dry coating film thickness is 1.0 μm, only a fluctuation of the film thickness of 0.067 μm is obtained, so that a coating film having a very uniform thickness can be obtained.

【0030】図6は通年における平均塗料温度の変化を
調べたグラフであり、横軸は月、縦軸は平均塗料温度で
ある。1年間通して調べたところ、温度の変化は±1℃
の範囲におさまり、ばらつきの標準偏差は0.3〜0.
4であった。従って、本発明に係る装置によれば、四季
を通じて良好な塗装を実施することができる。
FIG. 6 is a graph showing the change in the average paint temperature over the whole year. The horizontal axis represents the month, and the vertical axis represents the average paint temperature. The temperature change is ± 1 ° C when inspected throughout the year.
, And the standard deviation of the variation is 0.3 to 0.1.
It was 4. Therefore, according to the apparatus according to the present invention, it is possible to carry out good coating throughout the four seasons.

【0031】尚、図1に示した添加タイミング制御部6
3は、不揮発残分コントローラ61に組込んでもよい。
目標不揮発残分設定器62も同様である。
The addition timing control unit 6 shown in FIG.
3 may be incorporated in the nonvolatile residue controller 61.
The same applies to the target non-volatile residue setter 62.

【0032】[0032]

【発明の効果】本発明は上記構成により次の効果を発揮
する。請求項1は、ロールコータの塗料循環装置に塗料
の不揮発残分を一定にする不揮発残分制御装置と、塗料
の温度を一定にする塗料温度制御装置とを備えたので、
不揮発残分制御装置により塗料の不揮発残分を一定にす
ることができ、塗料温度制御装置で不揮発残分一定の塗
料を所定の温度にすることができるため、塗料の特性が
安定し、精度の高い膜厚塗装が実施できる。
According to the present invention, the following effects are exhibited by the above configuration. Claim 1 includes a non-volatile residue control device that makes the non-volatile residue of the paint constant in the paint circulation device of the roll coater, and a paint temperature control device that makes the temperature of the paint constant,
The non-volatile residue control device can keep the non-volatile residue of the paint constant, and the paint temperature control device can keep the non-volatile residue constant paint at a predetermined temperature. High film thickness coating can be performed.

【0033】請求項2は、請求項1記載のロールコータ
の塗料循環装置に、前回の溶剤添加から一定時間経過し
たことをもって次の添加を許可する添加タイミング制御
部を付設したことを特徴とする。上記の一定時間は、溶
剤添加装置により添加した溶剤が添加地点からコータパ
ンへ到達するに必要な時間またはそれ以上の時間であ
り、この様な一定時間をもたせることにより、不揮発残
分をより安定させることができ、なお良好な塗装を実施
することができる。
According to a second aspect of the present invention, the paint circulating device of the roll coater according to the first aspect further includes an addition timing control unit for permitting the next addition after a predetermined time has elapsed from the previous addition of the solvent. . The above-mentioned fixed time is a time required for the solvent added by the solvent addition device to reach the coater pan from the addition point or longer, and by giving such a fixed time, the non-volatile residue is further stabilized. And still achieve good coating.

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

【図1】本発明に係るロールコータの原理図FIG. 1 is a principle diagram of a roll coater according to the present invention.

【図2】本発明に係るロールコータの溶剤添加フロー図FIG. 2 is a flow chart of the solvent addition of the roll coater according to the present invention.

【図3】塗料温度の経時変化を示すグラフFIG. 3 is a graph showing a change over time in paint temperature.

【図4】塗料粘度の経時変化を示すグラフFIG. 4 is a graph showing the change over time in paint viscosity.

【図5】塗料温度と塗料粘度と不揮発残分との関係を調
べたグラフ
FIG. 5 is a graph showing the relationship between paint temperature, paint viscosity, and non-volatile residue.

【図6】通年における平均塗料温度の変化を調べたグラ
FIG. 6 is a graph showing changes in average paint temperature throughout the year.

【図7】従来のロールコータの原理図FIG. 7 is a principle diagram of a conventional roll coater.

【符号の説明】[Explanation of symbols]

1…ロールコータの塗料循環装置、4…循環タンク、1
0…コータパン、11…供給管、13…戻し管、14…
鋼帯、15…ロール(ピックアップロール)、16…ロ
ール(アプリケータロール)、21…塗料レベル検知手
段、22…熱交換器、23…1次側供給管、24…2次
側供給管、25…塗料温度検知手段、26…塗料粘度検
知手段、30…塗料温度制御装置、50…溶剤添加装
置、60…不揮発残分制御装置、62…目標不揮発残分
設定器、63…添加タイミング制御部。
1 ... Paint circulation device for roll coater, 4 ... Circulation tank, 1
0: coater pan, 11: supply pipe, 13: return pipe, 14 ...
Steel strip, 15 roll (pickup roll), 16 roll (applicator roll), 21 paint level detecting means, 22 heat exchanger, 23 primary supply pipe, 24 secondary supply pipe, 25 ... paint temperature detecting means, 26 ... paint viscosity detecting means, 30 ... paint temperature control device, 50 ... solvent addition device, 60 ... nonvolatile residue control device, 62 ... target nonvolatile residue setting device, 63 ... addition timing control unit.

Claims (2)

【特許請求の範囲】[Claims] 【請求項1】 コータパンに溜めた塗料をロールを介し
て鋼帯に塗布し、コータパン内の余剰塗料をオーバフロ
ーさせたのち戻し管で循環タンクに戻し、この循環タン
ク内の塗料を供給管を介して前記コータパンへ送ること
で塗料を循環させるロールコータの塗料循環装置におい
て、 前記塗料の供給管の途中に熱交換器を設け、この熱交換
器へ塗料を送る1次側供給管又は循環タンクに溶剤を投
入する溶剤添加装置を設け、循環タンクに塗料のレベル
を検知する塗料レベル検知手段を設け、前記熱交換器か
ら塗料を導き出す2次側供給管又はコータパンに塗料の
温度を検知する塗料温度検知手段並びに塗料の粘度を検
知する塗料粘度検知手段を設け、 検知した塗料の温度及び粘度からそのときの塗料の不揮
発残分を演算し、得られた計測不揮発残分と別途入力済
の目標不揮発残分との不揮発残分差を求め、一方、前記
塗料レベルから循環タンクの塗料量を求め、これに供給
管、コータパン並びに戻し管内の塗料量を加えて塗料循
環総量を求め、この塗料循環総量と前記不揮発残分差と
から塗料添加量を演算して、前記溶剤添加装置を作動さ
せる不揮発残分制御装置を溶剤添加装置に付設し、 前記温度検知手段の温度情報に基づいて前記熱交換器を
制御して溶剤の添加された塗料を所定の温度に調節する
塗料温度制御装置を熱交換器に付設したことを特徴とす
るロールコータの塗料循環装置。
1. A paint stored in a coater pan is applied to a steel strip via a roll, and after excess paint in the coater pan overflows, the paint is returned to a circulation tank by a return pipe, and the paint in the circulation tank is supplied through a supply pipe. In a paint circulation device of a roll coater that circulates paint by sending it to the coater pan, a heat exchanger is provided in the middle of the paint supply pipe, and a primary supply pipe or a circulation tank that sends paint to the heat exchanger is provided. A solvent adding device for introducing a solvent is provided, a paint level detecting means for detecting a paint level in a circulation tank is provided, and a paint temperature for detecting a paint temperature in a secondary supply pipe or a coater pan for leading paint from the heat exchanger. A detection means and a paint viscosity detection means for detecting the viscosity of the paint are provided. The nonvolatile residue of the paint at that time is calculated from the detected temperature and viscosity of the paint, and the obtained measurement non-volatility is obtained. The non-volatile residue difference between the residue and the separately input target non-volatile residue is determined, while the paint amount in the circulation tank is determined from the paint level, and the paint amount in the supply pipe, the coater pan and the return pipe is added thereto, and the paint quantity is calculated. Determine the total circulation amount, calculate the paint addition amount from the total paint circulation amount and the non-volatile residue difference, and attach a non-volatile residue control device for operating the solvent addition device to the solvent addition device; A paint circulating device for a roll coater, wherein a paint temperature control device for controlling the heat exchanger based on temperature information to adjust the paint to which the solvent is added to a predetermined temperature is attached to the heat exchanger.
【請求項2】 請求項1記載のロールコータの塗料循環
装置に、前回の溶剤添加から一定時間経過したことをも
って次の添加を許可する添加タイミング制御部を付設し
たことを特徴とするロールコータの塗料循環装置。
2. A roll coater according to claim 1, further comprising an addition timing control unit for permitting the next addition after a predetermined time has elapsed from the previous addition of the solvent. Paint circulation device.
JP28880096A 1996-10-30 1996-10-30 Coating material circulator of roll coater Pending JPH10128205A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP28880096A JPH10128205A (en) 1996-10-30 1996-10-30 Coating material circulator of roll coater

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP28880096A JPH10128205A (en) 1996-10-30 1996-10-30 Coating material circulator of roll coater

Publications (1)

Publication Number Publication Date
JPH10128205A true JPH10128205A (en) 1998-05-19

Family

ID=17734901

Family Applications (1)

Application Number Title Priority Date Filing Date
JP28880096A Pending JPH10128205A (en) 1996-10-30 1996-10-30 Coating material circulator of roll coater

Country Status (1)

Country Link
JP (1) JPH10128205A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20020004760A (en) * 2000-07-07 2002-01-16 이구택 solvent level control apparatus
WO2013049002A1 (en) * 2011-09-30 2013-04-04 Armstrong World Industries, Inc. Energy cured coating composition and process of applying same to substrate

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20020004760A (en) * 2000-07-07 2002-01-16 이구택 solvent level control apparatus
WO2013049002A1 (en) * 2011-09-30 2013-04-04 Armstrong World Industries, Inc. Energy cured coating composition and process of applying same to substrate
US9120937B2 (en) 2011-09-30 2015-09-01 Awi Licensing Company Energy cured coating composition and process of applying same to substrate
US9528024B2 (en) 2011-09-30 2016-12-27 Afi Licensing Llc Energy cured coating composition and process of applying same to substrate

Similar Documents

Publication Publication Date Title
CN106768495B (en) Commercial circulating heat pump water heater performance testing device and testing method
US6423366B2 (en) Strip coating method
RU2717812C1 (en) Printing head for three-dimensional printing with additional thermostating devices
MX2013008034A (en) Hot melt dispensing unit and method with integrated flow control.
CN112594936A (en) Preheating control method for instant heating body
JPH10128205A (en) Coating material circulator of roll coater
JPH10128206A (en) Coating material circulator of roll coater
KR20170074428A (en) Linear type polymer coating device for pipe
CN208894497U (en) A kind of coating machine is precisely controlled plus the device of resin temperature
JP6576776B2 (en) Temperature controlled spray coating equipment
US6416582B2 (en) Liquid usage detector for a coating apparatus
JP3587893B2 (en) Hot spray system
JP2000275158A (en) Automatic viscosity-measuring device and method and continuous coating facility
US6495196B1 (en) Process and apparatus for profile control of direct coaters
CN109814632B (en) Accurate control device and method for liquid drop temperature
RU2307780C1 (en) Method to control process of draining high viscosity products from tank
US6464788B2 (en) Liquid recovery and reclamation system
US4238516A (en) Method and device for treating cocoa butter-containing masses
JP3369109B2 (en) Paint temperature control method and apparatus for continuous coating of metal sheet
JPH08117663A (en) Device for supplying coating material to roll coater
KR101222235B1 (en) Control System for Paint Sticky
JPH01164463A (en) Method for controlling discharge of paint
CN109916777A (en) Mountable cylinder type rotational rheometer device and its application method in the production line
CN221667690U (en) High temperature surface fires testing arrangement
JPH07124506A (en) Applicator