JP2005169317A - Method and apparatus for producing coated plate - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To produce a coated steel plate which has a beautiful coating film having a targeted thickness, free of bubble defects, streaky defects, and roll marks, and excellent in appearance quality, by coating a steel plate with a roll coater. <P>SOLUTION: In producing the coated steel plate by coating a steel plate 0 with a roll coater having a coating roll 2 and a measuring roll 3, the respective set values of a touch amount (which is a pushed-in amount between the steel plate 0 and the coating roll 2) and a nip amount (which is a pushed-in amount between the coating roll 2 and the measuring roll 3) are acquired based on the relation among the wet film thickness on the steel plate 0, the touch amount, and the nip amount, the relation being previously acquired according to the transfer speed of the steel plate 0 so as not to cause coating defects on a coated steel plate; and the touch amount and the nip amount are controlled so as to be the same as the respective set values. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a manufacturing method and a manufacturing apparatus for a coated plate such as a coated steel plate.

  Supplying paint to the surface of a rotating cylindrical coating roll as a method of manufacturing a coated steel sheet by applying paint to the surface of a band (in the following description, the case where the band is a “steel plate”) And the roll coating method of apply | coating a coating material to the surface of a steel plate through the surface of this coating roll is known.

  In Patent Document 1, a groove roll (coating roll) in which a groove process is applied to rubber is pressed against the surface of the steel sheet, and when the liquid supplied to the inside of the groove is applied to the steel sheet, the liquid applied to the steel sheet It is disclosed that the adhesion amount is predicted and the pressing force of the coating roll against the steel sheet is controlled so that the predicted value of the liquid adhesion amount becomes a target amount.

  Further, in Non-Patent Document 1, when a coating roll in which rubber is grooved is pressed against the surface of the steel sheet and the liquid supplied to the inside of the groove is applied to the steel sheet, the liquid applied to the steel sheet is attached. It is disclosed that the amount tends to increase as the moving speed of the steel plate increases.

  Further, Non-Patent Document 2 discloses a positive rotation roll coater that includes a metering roll and a rubber applicator roll (coating roll), and the coating roll rotates in the same direction as the moving direction of the steel sheet.

  According to these inventions, it is certainly possible to produce a coated steel sheet having a coating film with a predetermined thickness.

JP-A-11-165127 Chemical Engineering, Vol. 26, No. 5, pp. 727-729, 2000 Introduction to coating equipment and operation technology, Yuji Harasaki, published by the Technical Center, page 60, 1990

However, in these inventions, it has not been possible to reliably prevent the occurrence of coating defects described below.
The first coating defect is a defect in which minute bubbles are observed on the surface of the coating film (hereinafter referred to as “bubble defect” in the present specification). The second coating defect is a defect in which a streak pattern having a relatively narrow pitch parallel to the moving direction of the steel plate is observed (hereinafter referred to as a “striped defect” in the present specification). Further, the third coating defect is a coating defect called a roll pattern in which a streak pattern having a relatively wide pitch parallel to the moving direction of the steel plate is observed.

  According to any of the above-mentioned inventions, when coating a steel sheet using a roll coater, the occurrence of these coating defects could not be reliably prevented. It was necessary to confirm that the coating conditions were free of defects, and a decrease in productivity and an increase in manufacturing cost of the coated steel sheet were inevitable.

  In addition, after starting production under the condition that the coating defects confirmed by the trial coating before the production does not occur, for example, when the moving speed (line speed) of the steel sheet is changed, the above-described painting defects are generated. It is not easy to prevent, but it is also not easy to maintain the surface properties of the coated steel sheet such as the coated skin well, and it is difficult to stably maintain the surface properties of the coated steel sheet in a good state.

  The present inventor is, for example, a coating roll that rotates in the same direction as the moving direction of the strip while contacting the strip that is a material to be coated such as a steel plate, and the rotation direction of the coating roll relative to the coating roll. The present invention has been completed by examining in detail the characteristics of a forward-rotating roll coater having a metering roll rotating in the opposite direction, based on data obtained from a number of coating experiments.

  The present invention relates to a coating roll that rotates in the same direction as the direction of movement of the band-shaped body while contacting the band-shaped body that is a material to be coated that moves in one direction, and a rotation direction of the coating roll that is opposed to the coating roll. When coating plates are produced by painting a strip using a roll coater that has a measuring roll that rotates in the opposite direction, the coating plate is poorly painted according to the moving speed of the material to be coated. Based on the relationship between the film thickness of the material to be coated, the touch amount that is the push amount between the coat material and the coating roll, and the nip amount that is the push amount between the paint roll and the metering roll, This is a method for manufacturing a coated plate, characterized in that set values for the touch amount and the nip amount are obtained, and the touch amount and the nip amount are controlled so as to be the respective set values.

  From another point of view, the present invention relates to a coating roll that rotates in the same direction as the direction of movement of the band-shaped body while contacting the band-shaped body that is a material to be coated that moves in one direction, A roll coater having a metering roll that rotates in the direction opposite to the direction of rotation of the coating roll, a means for adjusting the indentation amount between the material to be coated and the coating roll, and a means for adjusting the indentation amount between the coating roll and the metering roll; The means for measuring the moving speed of the coating material, the means for measuring the rotating speed of the coating roll, the means for measuring the rotating speed of the measuring roll, and the coating speed according to the moving speed of the coating material The film thickness of the material to be coated, the touch amount that is the amount of indentation between the material to be coated and the coating roll, and the amount of indentation between the coating roll and the metering roll that does not cause poor coating on the coated plate with the material coated Based on the relationship with a certain nip amount It comprises control means for obtaining setting values of the touch amount and the nip amount, an adjusting means for adjusting the touch amount to the obtained setting value, and an adjusting means for adjusting the nip amount to the obtained setting value. This is an apparatus for manufacturing a coated plate.

  When a coated plate is manufactured by coating a strip using a roll coater by the method and apparatus for manufacturing a coated plate according to the present invention, the coating plate has a target film thickness and the above-described coating defect does not occur and the appearance quality is high. A coated plate having an excellent and beautiful coating film can be produced. For this reason, a strip having any thickness can be applied with good appearance quality, and the surface properties of the coated plate can be improved.

  In addition, since it is not necessary to perform trial coating that has been necessary before the actual coating, it is possible to improve the productivity of the coated plate and to suppress an increase in the manufacturing cost of the coated plate.

  BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, a best mode for producing a coated plate and a production apparatus according to the present invention will be described in detail with reference to the accompanying drawings. In the following description, the case where the strip is a steel plate and the painted plate is a coated steel plate is taken as an example.

  FIG. 1 is an explanatory diagram conceptually showing the structure of a coated steel sheet manufacturing apparatus 1 according to the present embodiment. As shown in the figure, the manufacturing apparatus 1 includes a roll coater 4 having a coating roll 2 and a metering roll 3, a pressing amount adjusting means 5 between a steel plate 0 and a coating roll 2 as coating materials, and a coating roll. 2 and the pressing roll adjusting means 6, the moving speed measuring means 7, the rotational speed measuring means 8 of the coating roll 2, the rotating speed measuring means 9 of the measuring roll 3, the touch amount adjusting means 11, The nip amount adjusting means 12 includes a total of two sets, one set above and below the steel plate 0, and a control means 10 for controlling them. Therefore, these components of the manufacturing apparatus 1 will be described sequentially. The following description will be made with reference to the elements arranged below the steel plate 0 and the control means 10.

[Roll coater 4]
The manufacturing apparatus 1 of the present embodiment includes a roll coater 4. The roll coater 4 rotates with the coating roll 2 rotating in the same direction as the moving direction of the steel plate 0 along the steel plate 0 while contacting the surface of the steel plate 0 moving from left to right as viewed in the drawing. The measuring roll 3 is opposed to the coating roll 2 and rotates, for example, in contact with the outer peripheral surface and in a direction opposite to the rotation direction of the coating roll 2. Thus, the coating roll 2 rotates in one direction as the steel plate 0 moves, and the metering roll 3 rotates in the direction opposite to the rotation direction of the coating roll 2.

  When the belt-like body is a metal strip such as a steel plate 0 as in the present embodiment, the coating roll 2 is desirably a steel lining roll with a rubber lining on the surface. In addition, when a low-viscosity coating is applied thickly, it is desirable to use a roll in which many continuous or non-continuous depressions are formed in the circumferential direction on the rubber surface. The cross-sectional shape of the recess is not particularly limited, and examples thereof include a V shape, a U shape, and a trapezoid shape. What is necessary is just to determine the depth of a hollow suitably with the viscosity of the coating material 13 and the thickness of the coating film formed. For example, when the viscosity of the paint is 2 mPa · s and the target value of the wet film thickness is 6 μm, the depth of the depression is exemplified to be about several tens of μm.

The metering roll 3 is typically exemplified by using a steel roll, but a steel lining roll having a rubber lining on the surface may be used in the same manner as the coating roll 2.
Examples of the paint 13 supplied between the painting roll 2 and the metering roll 3 include using a paint having a viscosity of 1 to 1 OmPa · s. In particular, a low-viscosity paint having a viscosity of about 1 to 10 mPa · s is advantageous because it can easily increase the smoothness of the coating film.

  The rest of the configuration of the roll coater 4 may be the same as that of a known positive rotation roll coater, and is well known and commonly used by those skilled in the art, so further explanation regarding the roll coater 4 is omitted.

[Pushing amount adjusting means 5]
The push amount of the coating roll 2 is adjusted to the steel plate 0 by the push amount adjusting means 5.
The push-in amount adjusting means 5 presses the coating roll 2 against the steel sheet 0 by biasing the coating roll 2 in the direction perpendicular to the surface of the steel sheet 0 while rotatably supporting the coating roll 2. In FIG. 1, the pushing amount adjusting means 5 is conceptually drawn as a screw-like body attached to the coating roll 2, but any known pressurizing support mechanism of this type can be used as long as it has the above-described function. It does not need to be limited to a specific structure.

  Such a push-in amount adjusting means 5 is well-known and commonly used by those skilled in the art, and therefore further explanation regarding the push-in amount adjusting means 5 is omitted.

[Push-in amount adjusting means 6]
The pressing amount of the measuring roll 3 is adjusted by the pressing amount adjusting means 6.

  The pushing amount adjusting means 6 pressurizes the measuring roll 3 to the coating roll 2 by urging the measuring roll 3 in a direction connecting the center 2 a of the coating roll 2 and the center 3 a of the measuring roll 3. In FIG. 1, the push-in amount adjusting means 6 is conceptually drawn as a screw-like body mounted on the measuring roll 3, but any known pressurizing shaft support mechanism of this type can be used as long as it has the above-described function. It does not need to be limited to a specific structure.

  Such a push-in amount adjusting means 6 is well-known and commonly used by those skilled in the art, and therefore further explanation regarding the push-in amount adjusting means 6 is omitted.

[Movement speed measuring means 7]
The manufacturing apparatus 1 includes a moving speed measuring unit 7 for measuring the moving speed of the steel plate 0. The moving speed measuring means 7 only needs to have a function capable of measuring the moving speed of the steel sheet 0, and may be a mechanical type, an electric type, or any other type.

  Since such a moving speed measuring means 7 is a well-known and conventional one for those skilled in the art, further description regarding the moving speed measuring means 7 is omitted.

[Rotational speed measuring means 8]
The manufacturing apparatus 1 includes a rotation speed measuring means 8 for measuring the rotation speed (roll peripheral speed) of the coating roll 2. The rotational speed measuring means 8 may be any one having a function capable of measuring the rotational speed (roll peripheral speed) of the coating roll 2, and may be a mechanical type, an electric type, or any other type. Good.

Since such a rotational speed measuring means 8 is well known to those skilled in the art, further description of the rotational speed measuring means 8 is omitted.
[Rotational speed measuring means 9]
The manufacturing apparatus 1 includes a rotational speed measuring means 9 for measuring the rotational speed (roll peripheral speed) of the measuring roll 3. The rotational speed measuring means 9 may be any one having a function capable of measuring the rotational speed of the measuring roll 3, and may be a mechanical type, an electric type, or another type.

  Such rotation speed measuring means 9 is well known and commonly used by those skilled in the art, and further description of the rotation speed measuring means 9 will be omitted.

[Control means 10]
The manufacturing apparatus 1 includes a control unit 10. In short, the control means 10 includes a film thickness of the steel plate 0, a “touch amount” that is a push amount between the steel plate 0 and the coating roll 2, and a “nip” that is a push amount between the paint roll 2 and the measuring roll 3. The relationship that exists between “the amount” and that does not cause coating defects (bubble defects, streak defects, and rolls) in the coated steel sheet is stored in advance for each moving speed of the steel sheet 0. When the moving speed of the steel plate 0 and the wet film thickness are determined at the time of coating, the set values of the touch amount and the nip amount are obtained based on this relationship.

  More specifically, the “touch amount” means the amount of movement in the pushing direction of the coating roll 2 to the steel plate 0 from the state where the steel plate 0 and the coating roll 2 are in line contact. The amount of movement in the pushing direction is expressed with a negative sign. The “nip amount” means the amount of movement of the measuring roll 3 in the pushing direction to the coating roll 2 from the state in which the coating roll 2 and the measuring roll 3 are in line contact. The amount of movement in the direction is expressed with a negative sign, and the amount of movement in the direction in which the gap between the metering roll 3 and the coating roll 2 opens is attached with a positive sign.

In the present embodiment, it is extremely important to obtain this relationship in advance, and this relationship will be described in detail below.
FIG. 2 shows a coating roll peripheral speed ratio (peripheral speed of the coating roll 2 / moving speed of the steel plate 0), which is a ratio of the peripheral speed of the coating roll 2 to the moving speed of the steel plate 0, and the measuring roll 3 with respect to the moving speed of the steel plate 0. FIG. 6 is a graph showing the relationship between the touch amount and the nip amount when both the measurement roll peripheral speed ratio (peripheral speed of the measurement roll 3 / moving speed of the steel plate 0), which is a ratio of the peripheral speeds, are 1. FIG. 2A shows the case where the moving speed of the steel plate 0 is V1, FIG. 2B shows the case where the moving speed of the steel plate 0 is V2, and FIG. 2C shows the moving speed of the steel plate 0. Shows the case where is V3. However, V1 <V2 <V3. 2A to 2C, the bubble defect is shown as the coating defect I, the streak defect is shown as the coating defect II, and the roll is shown as the coating defect III.

  As shown in the graphs of FIGS. 2A to 2C, the coating appearance of the steel plate 0 is determined by the nip amount and the touch amount, and the coating defect depends on the moving speed (line speed) of the steel plate 0. It can be seen that the beautiful coating region that does not generate I to III and the type of coating defect that occurs change.

  More specifically, in FIG. 2A where the moving speed of the steel plate 0 is the lowest, a relatively large beautiful coating region appears, and the generated coating defect is a bubble defect. In FIG. 2B in which the moving speed of the steel plate 0 is medium, the beautiful coating region appears smaller than that in FIG. 2A, and the generated coating defect is only a streak defect or a bubble defect. And a streak defect are mixed. Further, in FIG. 2C where the moving speed of the steel plate 0 is the highest, a beautiful coating region having the same size as that in FIG. 2B appears, and the generated coating defects are streak defects and roll eyes.

  Moreover, in FIG. 2 (a)-FIG.2 (c), the uniform film thickness line which shows that the measurement roll peripheral speed ratio and the coating roll peripheral speed ratio are all the same wet film thickness is 1 from a coating experiment. It is written together. In addition, the number in a figure shows a wet film thickness.

  As shown in FIG. 2, the uniform film thickness depends on the moving speed of the steel plate 0, the nip amount, and the touch amount. In FIG. 2A where the moving speed of the steel plate 0 is relatively low, the influence of the nip amount is small, and as the touch amount increases, the film thickness decreases, but the moving speed of the steel plate 0 is relatively high. In FIG. 2C, the film thickness tends to increase as the nip amount decreases and the touch amount decreases. Therefore, if the nip amount and the touch amount are controlled along the equal film thickness lines in FIGS. 2A to 2C, the coating can be performed with the same wet film thickness regardless of the moving speed of the steel plate 0. it can.

  Furthermore, based on FIGS. 2 (a) to 2 (c), if the nip amount and the touch amount are controlled under the condition that a uniform film thickness of the target film thickness exists in the beautiful coating region, the predetermined wet film thickness is obtained. It can be applied beautifully without causing bubble defects, streak defects or even rolls. Thereby, it can apply | coat beautifully with the target film thickness.

  2A to 2C depend on the moving speed of the steel plate 0, and therefore, for each moving speed of the steel plate 0, FIG. 2A to FIG. It is necessary to obtain the relationship between the nip amount and the touch amount shown in (c).

  Therefore, in the present embodiment, it is obtained based on the relationship between the moving speed of the steel sheet 0, the nip amount, the touch amount, the beautiful coating conditions, and the coating thickness, specifically, the relationship between the beautiful coating conditions and the coating thickness. In addition, the target film thickness, the moving speed of the steel plate 0, the nip amount, the touch amount, the metering roll peripheral speed ratio, the coating roll peripheral speed ratio, and the like are tabulated and stored in the storage unit of the control means 10. In addition, since the measurement roll peripheral speed ratio and the coating roll peripheral speed ratio also affect the coating film thickness, the above-described relationship may be tabulated in consideration of the measurement roll peripheral speed ratio and the coating roll peripheral speed ratio. desirable.

  In this way, this control means 10 is a relationship that exists between the wet film thickness of the steel plate 0, the touch amount, and the nip amount and does not cause poor coating on the steel plate 0. It is stored in advance as a table value according to the speed.

When the moving speed of the steel plate 0 and the wet film thickness are determined during the coating of the steel plate 0, the control means 10 determines the set values for the touch amount and the nip amount based on this relationship. The determined touch amount setting value is output as a target value to the touch amount adjusting means 11 described later, and the determined nip amount setting value is output as a target value to the nip amount adjusting means 12 described later.
The control means 10 of this embodiment is configured as described above.

[Touch amount adjusting means 11]
The manufacturing apparatus 1 includes touch amount adjusting means 11 for adjusting the touch amount to the set value obtained by the control means 10.

The touch amount adjusting unit 11 adjusts the push amount (touch amount) of the coating roll 2 onto the steel plate 0 based on the touch amount set value commanded from the control unit 10. The touch amount adjusting means 11
A well-known and conventional device may be used as this type of device, and it is considered that no special explanation is required for those skilled in the art, so further explanation regarding the touch amount adjusting means 11 is omitted.

  The peripheral speed of the coating roll 2 is adjusted by a coating roll speed adjusting means (not shown) based on the command from the control means 10 described above.

[Nip amount adjusting means 12]
The manufacturing apparatus 1 includes a nip amount adjusting unit 12 for adjusting the nip amount to a set value obtained by the control unit 10.

  The nip amount adjusting unit 12 adjusts the pushing amount (nip amount) of the measuring roll 3 into the coating roll 2 based on the set value of the nip amount commanded from the control unit 10 described above. As the nip amount adjusting means 12, it is sufficient to use a well-known and conventional device of this type, and it is considered that no special explanation is necessary for those skilled in the art, so further explanation regarding the nip amount adjusting means 12 is omitted. To do.

The peripheral speed of the measuring roll 3 is adjusted by a measuring roll speed adjusting means (not shown) based on the command from the control means 10 described above.
The manufacturing apparatus 1 of the present embodiment is configured as described above. Next, a situation in which a coated steel sheet having a target dry film thickness and a beautiful appearance quality is manufactured using the manufacturing apparatus 1 will be specifically described with reference to a flowchart shown in FIG.

  In step (hereinafter abbreviated as “S”) 1 in FIG. 3, the target wet film thickness is obtained by conversion from the target target dry film thickness in consideration of the nonvolatile content of the paint 13, and the target wet film thickness is obtained by the control means 10. Enter. Of course, the target dry film thickness may be directly input to the control means 10 so that the target wet film thickness is automatically calculated inside the control means 10 based on the nonvolatile content of the paint 13 stored in the control means 10 in advance. Needless to say, it is good. Then, the process proceeds to S2.

  In S <b> 2, the moving speed of the steel plate 0 detected by the moving speed measuring means 7 is taken into the control means 10. As for the moving speed of the steel sheet 0, the continuity of capturing improves the film thickness adjustment responsiveness, and the quality of the product can be improved accordingly. Then, the process proceeds to S3.

  In S <b> 3, the control unit 10 stores the above-described “wet film thickness, touch amount, and nip amount of the steel plate 0” stored in advance as a table value in the control unit 10 based on the taken moving speed of the steel plate 0. Based on the database of “a relationship existing between and a relationship that does not cause poor coating on the steel sheet 0”, a combination of a nip amount and a touch amount capable of beautifully applying a target film thickness is derived.

  Here, as shown in FIGS. 2A to 2C, there are an infinite number of combinations of the nip amount and the touch amount along the equal film thickness line, but either one of the nip amount and the touch amount. Is previously stored in the control means 10 as an initial value, the other touch amount or nip amount can be uniquely determined using this initial value.

In the present embodiment, since the nip amount is stored in advance in the control means 10 as an initial value, the initial value of the nip amount is read here. Then, the process proceeds to S4.
In S4, the touch amount is calculated based on the above-described relational database and the initial value of the nip amount read in S3. Then, the process proceeds to S5.

  In S5, whether or not the condition determined by the nip amount read in S3 and the tap amount calculated in S4 is a beautiful coating region in the graphs illustrated in FIGS. 2 (a) to 2 (c). Determine whether.

  As a result, when it is determined that the region is in the beautiful coating region, the process proceeds to S6, and the nip amount is output to the nip amount adjusting means 12 as the nip amount target value, and the touch amount is set to the touch amount. The target value is output to the touch amount adjusting means 11. Accordingly, the nip amount and the tap amount are controlled to the obtained set values.

  On the other hand, if it is determined that it is not in the beautiful paint region, the process proceeds to S7, a new nip amount increased in the positive direction from the nip amount read in S3 is determined, the process proceeds to S4, and the process proceeds to S5. The determination operation is performed until it is determined that the object is in the beautiful paint area.

  Thereafter, the coated steel sheet 0 is conveyed to a drying device such as an oven or a dryer (not shown), and the coating film is dried. In this way, a coated steel sheet having a beautiful targeted dry film thickness can be obtained.

  Next, a control method when the moving speed of the steel plate 0 changes during painting will be described. If the line speed changes during coating in the state described above, the film thickness may change depending on the amount of change.

  Therefore, in such a case, based on the above-described relational database stored in the control means 10, a combination of the nip amount and the touch amount capable of beautifully applying the target film thickness is obtained. The set values of the nip amount and the touch amount may be determined. By this method, even when the moving speed of the steel plate 0 is changed, a coated steel plate having a beautiful target dry film thickness can be obtained.

  Thus, in this embodiment, the coating roll 2 that rotates in the direction along the steel plate 0 while being in contact with the steel plate 0 and the metering that rotates in the direction opposite to the rotation direction of the coating roll 2 while in contact with the coating roll 2 are described. When coating the steel sheet 0 using the roll coater 4 having the roll 3, based on the relationship between the touch amount and the nip amount, which is obtained in advance according to the moving speed of the steel plate 0 and does not cause poor coating on the steel plate 0. Thus, the setting values of the touch amount and the nip amount are obtained by the control means 10, and the touch amount and the nip amount are controlled so as to be the respective obtained set values.

  Thereby, when coating the steel sheet 0 using the roll coater 4, it is possible to perform a beautiful coating having a target film thickness and excellent appearance quality that does not cause bubble defects, streak defects, and roll eyes. It became so. For this reason, the steel plate 0 having any film thickness can be coated with good appearance quality, and the surface properties of the coated steel plate can be improved.

  In addition, since it is not necessary to perform trial coating that has been necessary before the actual coating, it is possible to improve the productivity of the coated steel sheet and suppress an increase in manufacturing cost.

Furthermore, the present invention will be described more specifically with reference to examples.
A coated steel sheet having a target dry film thickness of 0.6 μm was manufactured by coating the steel sheet 0 under the following conditions using the manufacturing apparatus 1 according to the present invention shown in FIG.

Viscosity of paint 13: 2 mPa · s
Non-volatile content of paint 13: 10 wt%
Coating roll 2 diameter: 450 mm
Rubber lining thickness of paint roll 2: 25mm
Surface shape of coating roll 2: continuous V groove engraving Ratio of groove depth to groove pitch: 0.18
Measuring roll 3: Metal roll Diameter of measuring roll 3: 300 mm
Moving speed of steel plate 0: initial 20 m / min, after speed increase 120 m / min
Standard peripheral speed ratio of coating roll 2: 1.0
Standard peripheral speed ratio of the measuring roll 3: 1.0
Nip amount reference value: -0.1 mm
In this embodiment, as described above, the moving speed of the steel plate 0 is increased from the initial 20 m / min to 120 m / min in the middle of the coating, and an operation for performing a beautiful coating with a target dry film thickness of 0.6 μm is performed. went. Since the non-volatile content of the paint is 10 wt%, the converted value of the wet film thickness for obtaining a target dry film thickness of 0.6 μm is 6 μm.

First, a method for determining the nip amount and the touch amount when the moving speed of the steel plate is 20 m / min will be described.
In the flowchart shown in FIG. 3, −1.0 mm, which is a sufficiently large value empirically in the painting process, is input as the initial value of the nip amount.

  Next, referring to the database stored in the control means 10, when a touch amount that can apply a wet film thickness of 6 μm with a nip amount of −1.0 mm is obtained, the touch amount is −0.5 mm.

  However, when it was determined whether or not the paint was beautiful, it was determined that the nip amount was -1.0 mm and the touch amount was -0.5 mm, indicating that it was a coating defect area, so the nip amount was set to -0.9 mm. Changed and repeated the work of calculating the touch amount from the database again. When this calculation was repeated, the nip amount: -0.1 mm and the touch amount: -0.5 mm were calculated as the beautiful coating conditions for the target film thickness when the moving speed of the steel sheet 0 was 20 m / min. The push amount was adjusted by the push amount adjusting means 11 and 12 so that the set value was obtained. As a result, a beautiful coating film having a dry film thickness of 0.6 μm could be obtained.

  Subsequently, when the moving speed of the steel plate 0 is increased to 120 m / min, the film thickness becomes too thick when the nip amount is −0.1 mm and the touch amount is −0.5 mm. As a result of examination based on the base, the amount of touch at which a wet film thickness of 6 μm can be applied at a nip amount of −0.1 mm was −1.5 mm.

  Therefore, when the beautiful paintability at the nip amount: −0.1 mm and the touch amount: −1.5 mm was judged, it was evaluated that the beautiful coating was possible, so the touch amount was adjusted to the push amount adjusting means 11 and 12 from −0.5 mm− Information to change to 1.5 mm was sent, and the touch amount was changed to -1.5 mm.

  As a result, even if the moving speed of the steel plate 0 was changed from 20 m / min to 120 m / min, a coated steel plate having a target film thickness and causing no coating failure could be produced.

It is explanatory drawing which shows notionally the structure of the manufacturing apparatus of the coated steel plate of embodiment. Coating roll peripheral speed ratio (coating roll peripheral speed / steel plate moving speed), which is the ratio of the peripheral speed of the coating roll to the steel plate moving speed, and the ratio of the measuring roll peripheral speed to the steel plate moving speed. When the speed ratio (peripheral speed of the measuring roll / moving speed of the steel plate) is 1, the touch amount, which is the amount of indentation between the steel plate and the coating roll, which affects the appearance of the coating film applied to the steel plate, and coating It is a graph which shows the relationship with the nip amount which is the pushing amount between a roll and a measurement roll, Comprising: Fig.2 (a) shows the case where the moving speed of a steel plate is V1, FIG.2 (b) shows the moving speed of a steel plate. FIG. 2C shows the case where the moving speed of the steel sheet is V3. It is a flowchart for demonstrating the condition which manufactures the coated steel plate which has the target dry film thickness and has the beautiful appearance quality using the manufacturing apparatus which concerns on this invention.

Explanation of symbols

0: Steel plate 1: Manufacturing device 2: Coating roll 3: Measuring roll 4: Roll coater 5: Push-in amount adjusting means 6: Push-in amount adjusting means 7: Moving speed measuring means 8: Rotational speed measuring means 9: Rotational speed measuring means 10 : Control means 11: Touch amount adjusting means 12: Nip amount adjusting means 13: Paint

Claims (2)

A coating roll that rotates in the same direction as the direction of movement of the band-shaped body while contacting the band-shaped body that is a material to be coated that moves in one direction, and that is opposite to the direction of rotation of the coating roll relative to the coating roll. When producing a coated plate by painting the strip using a roll coater having a rotating metering roll,
The film thickness of the coated material, which is obtained in advance according to the moving speed of the coated material, does not cause poor coating on the coated plate, and the indented amount between the coated material and the coating roll. Based on the relationship between the touch amount and the nip amount, which is the push amount between the coating roll and the metering roll, set values for the touch amount and the nip amount are obtained, and the set values are set to the respective set values. A method for producing a coated plate, wherein the touch amount and the nip amount are controlled. A coating roll that rotates in the same direction as the direction of movement of the band-shaped body while contacting the band-shaped body that is a material to be coated that moves in one direction, and that is opposite to the rotation direction of the coating roll, relative to the coating roll. A roll coater having a rotating metering roll;
Means for adjusting the amount of indentation between the material to be coated and the coating roll;
Means for adjusting the amount of pushing between the coating roll and the metering roll;
Means for measuring the moving speed of the material to be coated;
Means for measuring the rotation speed of the coating roll;
Means for measuring the rotational speed of the metering roll;
Depending on the moving speed of the material to be coated, the coating plate on which the material to be coated is coated does not cause poor coating, and the film thickness of the material to be coated and the space between the material to be coated and the coating roll A control means for obtaining a set value of each of the touch amount and the nip amount based on a relationship between a touch amount that is a push amount of nip and a nip amount that is a push amount between the coating roll and the metering roll;
Adjusting means for adjusting the touch amount to the determined setting value;
An apparatus for producing a coated plate, comprising: an adjusting unit that adjusts the nip amount to the obtained set value.

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