JPH1157565A - Liquid coating method and method and device for metallic strip coating - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the degradation in the quality of a coated metallic strip and the appearance of products and to reduce the time and cost required for experiment. SOLUTION: The pressing acting on the metallic strip which acts in the respective parts where groove rolls 1 and the metallic strip 2 come into contact in the metallic strip coating application method for pressing the groove rolls 1 formed by grooving rubber covering the surfaces of outer peripheral parts to the traveling metallic strip 2 and applying the coating material 3 in the grooves of the groove rolls 1 to the metallic strip 2 is determined from the factors affecting the pressing force at the time of pressing the groove rolls 1 to the metallic strip 2, the shape of the groove rolls 1, the properties of the rubber and the contact state of the groove rolls 1 and the metallic strip 2, such as the shapes of the metallic strip 2. The coating weight of the coating material 3 to be applied on the metallic strip 2 is predicted by using the determined pressure acting on the metallic strip. The pressing force at the time of pressing the groove rolls 1 to the metallic strip 2 is then controlled in such a manner that the predicted coating weight of the coating material 3 attains the target coating weight of the coating material 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid coating method for applying a liquid (paint) to the surface of a metal strip using a groove roll in which an elastic material (rubber) covering the outer peripheral surface is grooved. The present invention relates to a metal band coating method and a metal band coating apparatus, and in particular, predicts the amount of liquid (paint) applied to a metal band from a groove roll and controls the pressing force when pressing the groove roll against the metal band. The present invention relates to a method, a metal band coating method, and a metal band coating device.

[0002]

2. Description of the Related Art One of metal band coating methods for coating a metal band surface such as a steel plate with a paint is to use a groove roll formed in a cylindrical shape and having a groove formed in a rubber covering an outer peripheral surface. There is a method in which a metal strip is coated by pressing the metal strip against a continuously running metal strip and applying the paint supplied from the outside into the groove of the groove roll to the metal strip.

FIG. 4 is a conceptual diagram showing an example of such a conventional metal band coating method. Here, FIG. 4A is a conceptual diagram viewed from the rotation axis direction of the groove roll.
FIG. 4B is a conceptual view as viewed from the running direction of the metal band, and FIG. 4C is an enlarged view of a contact portion between the metal band and the groove roll viewed from the running direction of the metal band.

[0004] There are various types of groove shapes of the groove roll 1, but a case of a mountain shape is shown here. In this case, the shape of the space (hereinafter, referred to as “cell”) formed when the groove roll 1 and the metal strip 2 come into contact has a triangular cross section perpendicular to the running direction of the metal strip 2.

FIG. 5 shows a metal strip 2 and a paint 3 after painting.
FIG. 4 is a cross-sectional view showing an example of the relationship between the metal strip 2 and a cross section perpendicular to the running direction of the metal strip 2. Here, FIG.
5A shows a state immediately after the coating is performed, and FIG. 5B shows a state in which the coating is leveled so that the film thickness becomes uniform.

In this metal band coating method, the groove of the groove roll 1 is filled with the coating material 3, and the coating is performed by attaching the coating material 3 to the metal band 2. Immediately after painting, the paint contact portion where the metal band 2 and the paint 3 come into contact with each other is painted, and the non-paint contact portion where the metal band 2 and the paint 3 do not come into contact with each other is not painted. The paints 3 are connected to each other, and the paint 3 is applied to the entire surface of the metal strip 2.

However, even if leveling is performed, the amount of paint 3 applied to the non-paint contact area may be smaller than the amount of paint applied to the paint contact area, so that the painted metal strip 2 has, for example, corrosion resistance and earth resistance. It may cause deterioration of quality such as properties and appearance.

Therefore, in this metal band coating method,
It is important to understand the relationship between operating conditions and the amount of paint adhesion, and to perform coating under appropriate operating conditions. In the case of coating with a metal groove roll 1, the paint film thickness h uniformed by leveling after coating can be obtained by equation (1) based on the experimental results with various groove rolls 1 having different groove shapes. But H.Benkreira and R.Pa
tel (Chemical Engineering Sci
ence, Vol. 48, No. 12, pp. 2329-2335, 1993).

Paint film thickness h = C1 × (cell volume / paint contact area) (1) Here, the constant C1 is 0.3 when the value is more than a certain Reynolds number. Therefore, the metal groove roll 1
In the case of performing the coating by the method, if the shape of the groove, the physical properties of the paint and the roll peripheral speed of the groove roll 1 are determined,
The paint film thickness h can be obtained from the equation (1), and the paint adhesion amount can be estimated from the paint film thickness h.

[0010] On the other hand, when the coating is performed by a rubber groove roll 1 whose outer peripheral surface in contact with the metal band 2 is covered with rubber, as shown in FIG. The groove is deformed by the pressing reaction force of the groove, and the length H (hereinafter, referred to as the length) of the portion where the groove roll 1 and the metal band 2 are in contact with each other in the cross section perpendicular to the running direction of the metal band
(Referred to as “roll contact length”), and the shape of the cell is different from the shape when no pressing reaction force is applied. Therefore, according to the formula (1) shown by H. Benkreira and R. Patel, Cell volume / paint contact area, which is an important factor in predicting the amount of adhesion (or cell area / paint contact area, which is equivalent to the cell cross-sectional area A / perpendicular to the running direction of the metal strip 2) The paint contact portion length R), which is the boundary between the cell and the metal strip 2 in the cell cross section, cannot be clarified.

Therefore, when coating with the rubber groove roll 1, there is no generally applicable method for predicting the amount of paint applied, and it is necessary to experimentally determine the amount of paint applied to each groove shape. There is.

However, in the above-described method of experimentally obtaining the relationship between the operating conditions and the amount of paint applied to various groove shapes and paints 3 to predict the amount of paint applied, time and cost are increased. There is such a problem.

[0013]

As described above, in the conventional metal band coating method, even when leveling is performed, the amount of paint applied to the non-paint contact area is compared with the amount of paint applied to the paint contact area. In some cases, it may cause a decrease in the quality and appearance of the painted metal strip.

[0014] Therefore, in the conventional metal band coating method, it is important to grasp the relationship between the operating conditions and the amount of applied paint and to perform coating under appropriate operating conditions. In addition, in the conventional metal band coating method, when coating with a rubber groove roll, there is no generally applicable method for estimating the amount of paint applied, and the paint is applied experimentally to each groove shape. Since it is necessary to determine the amount, there is a problem that it takes time and costs.

The present invention has been made in consideration of the above-described circumstances, and predicts the amount of liquid (paint) adhered to a metal band by a groove roll, so that the quality of the metal band to which the liquid (paint) is applied is estimated. It is an object of the present invention to provide a liquid coating method, a metal band coating method, and a metal band coating device that can prevent deterioration of the appearance of products and products, and reduce the time and cost required for experiments.

[0016]

In order to achieve the above object, the present invention is directed to a metal strip which runs continuously on a groove roll in which a groove is formed in an elastic material covering an outer peripheral surface portion. In the liquid applying method of applying a liquid supplied from the outside into the groove of the groove roll to the metal band, the metal band working pressure, which is a pressure acting on each portion where the groove roll and the metal band are in contact with each other, From the factors affecting the contact state between the groove roll and the metal band, such as the pressing force when pressing the metal band against the metal band, the shape of the groove roll, the physical properties of the elastic material, and the shape of the metal band.
Using the obtained metal band working pressure, the amount of the liquid to be applied to the metal band is predicted, and the groove roll is set to the metal band so that the predicted liquid adhesion amount becomes the target amount of the liquid. This is a liquid application method for controlling a pressing force when pressing the liquid.

Therefore, in the liquid applying method according to the first aspect of the present invention, the factors affecting the contact state between the groove roll and the metal band (the pressing force when pressing the groove roll against the metal band, the groove roll). (Including the shape of the elastic material, the physical properties of the elastic band, and the shape of the metal band), the metal band working pressure is calculated, and the amount of liquid adhesion is predicted from the obtained metal band working pressure. In order to control the pressing force when pressing the groove roll against the metal band so that the target amount of liquid adheres, the amount of paint applied to the non-liquid contact portion where the liquid does not come into contact with the metal band is reduced. It is possible to prevent the amount of liquid adhering to the liquid contact portion where the liquid strip comes into contact with the liquid strip, thereby preventing the metal strip to which the liquid is applied from deteriorating in quality and appearance.

Further, since it is not necessary to experimentally determine the amount of liquid adhered, the time and cost required for the experiment can be reduced. Next, according to a second aspect of the present invention, in the liquid applying method according to the first aspect, when the adhesion amount of the liquid applied to the metal band is estimated using the determined metal band operating pressure, The working pressure is divided by the pressure to completely crush the groove of the groove roll to obtain a dimensionless non-dimensional pressure, and from the obtained non-dimensional pressure, using a predetermined approximation function, the metal band working pressure is calculated. In the space formed between the groove of the groove roll and the metal band when acting, the area of the cell cross section, which is a cross section perpendicular to the running direction of the metal band, is determined, and the metal band operating pressure is acting. The cell cross-sectional area at the time, before the metal strip working pressure acts,
In addition, the liquid film is obtained by multiplying a value obtained by dividing a value obtained by dividing a length of a liquid contact portion which is a boundary between a space and a metal band in a cell cross section in a state where the groove roll is in contact with the metal band by a predetermined constant. This is a liquid application method for estimating the thickness of a liquid and estimating the amount of liquid to be applied.

Therefore, in the liquid applying method according to the second aspect of the present invention, the same effects as those of the first aspect can be obtained. Next, a third aspect of the present invention is to provide a method in which a groove roll formed on a rubber covering a surface of an outer peripheral surface portion is pressed against a continuously running metal strip, and paint supplied from the outside into a groove of the groove roll is provided. In a metal band coating method of coating the metal band by applying the metal band to the metal band, the metal band working pressure, which is the pressure acting on each part where the groove roll and the metal band are in contact, presses the groove roll against the metal band. The pressing force at the time, the shape of the groove roll, the physical properties of rubber, the shape of the metal band, etc. are determined from the factors that affect the contact state between the groove roll and the metal band. Predict the amount of paint to be applied and control the pressing force when pressing the groove roll onto the metal strip so that the predicted amount of paint to be applied is the target amount of paint. A metal strip coating method to.

The method for coating a metal band according to the third aspect of the present invention
In the liquid applying method according to the first aspect, the liquid is paint and the elastic material is rubber. Therefore, claim 1
The same effect can be obtained by the same operation as.

According to a fourth aspect of the present invention, in the metal strip coating method according to the third aspect, the amount of paint applied to the metal strip is estimated using the determined metal strip operating pressure. The non-dimensional pressure is obtained by dividing the obtained metal band working pressure by the pressure for completely crushing the groove of the groove roll, and from the obtained non-dimensional pressure, using a predetermined approximate function, the metal is used. Obtain the area of the cell cross section perpendicular to the running direction of the metal band in the space formed between the groove of the groove roll and the metal band when the band operation pressure is acting, and the metal band operation pressure is The cell cross-sectional area when acting, before the metal strip working pressure acts,
The value obtained by dividing the value obtained by dividing the length of the paint contact portion, which is the boundary between the space and the metal strip in the cell cross section in a state where the groove roll is in contact with the metal strip, by a predetermined constant is used to multiply the paint film thickness. This is a metal band coating method for estimating the amount of paint applied by calculating the amount of paint.

Therefore, in the metal band coating method according to the fourth aspect of the present invention, the same effect as that of the third aspect can be obtained. Next, the invention according to claim 5 is directed to a method in which a groove roll formed on a rubber covering the surface of an outer peripheral surface portion is pressed against a continuously running metal strip, and paint supplied from outside into the groove of the groove roll is provided. Is applied to the metal strip, in a metal strip coating apparatus for coating the metal strip, the metal strip action pressure, which is the pressure acting on each part where the groove roll and the metal strip are in contact, presses the groove roll onto the metal strip. Pressing force, groove roll shape, physical properties of rubber, shape of metal band, metal band working pressure calculating means obtained from factors affecting the contact state between the groove roll and the metal band, and the metal band working pressure calculating means Using the metal band working pressure determined by the above, paint adhesion amount predicting means for predicting the amount of paint applied to the metal band,
A metal strip coating apparatus comprising: control means for controlling a pressing force when pressing the groove roll onto the metal strip so that the paint adhesion quantity predicted by the paint adhesion quantity prediction means becomes a target paint adhesion quantity. It is.

Therefore, in the metal band coating apparatus according to the present invention, the paint adhesion amount predicted by the paint adhesion amount prediction means using the metal band operation pressure obtained by the metal band operation pressure calculation means is set to the target value. The control means controls the pressing force when pressing the groove roll against the metal band so that the paint adheres to the metal strip. It is possible to prevent the amount of paint from being reduced as compared with the amount of paint adhered to the paint contact portion where the band comes into contact, and to prevent the quality and appearance of the painted metal band from being deteriorated.

Further, since it is not necessary to experimentally determine the amount of paint applied, the time and cost required for the experiment can be reduced. Next, according to a sixth aspect of the present invention, in the liquid application method according to the first or second aspect, the metal band working pressure is set to:
Determined from factors that affect the contact state between the groove roll and the metal band, such as the pressing force when pressing the groove roll against the metal band, the passing speed of the metal band, the shape of the groove roll, the physical properties of the elastic material, and the shape of the metal band. And

That is, here, the metal band working pressure is:
It is determined from factors including the pressing force when pressing the groove roll against the metal strip, the passing speed of the metal strip, the shape of the groove roll, the physical properties of the elastic material, and the shape of the metal strip.

The pressure generated by the liquid present on the groove roll surface and in the groove changes depending on the passing speed of the metal strip. In the liquid application method according to the sixth aspect, the metal band operating pressure is determined in consideration of the liquid pressure that changes with the passing speed.

Therefore, the liquid can be more accurately applied. Next, according to a seventh aspect of the present invention, in the metal band coating method according to the third or fourth aspect, the working pressure of the metal band is set to a pressing force when pressing the groove roll against the metal band, a passing speed of the metal band, Groove roll shape,
It is determined from factors that affect the contact state between the groove roll and the metal band, such as the physical properties of rubber and the shape of the metal band.

[0028] The metal band coating method of the invention according to claim 7 is as follows.
In the liquid application method according to the sixth aspect, the liquid is paint and the elastic material is rubber. Therefore, claim 6
The same effect can be obtained by the same operation as.

According to an eighth aspect of the present invention, in the metal band coating apparatus according to the fifth aspect, the metal band operating pressure calculating means calculates the metal band operating pressure by a pressing force when pressing the groove roll against the metal band. It is determined from factors that affect the contact state between the groove roll and the metal band, such as the belt passing speed, the shape of the groove roll, the physical properties of rubber, and the shape of the metal band.

This metal band coating apparatus performs the same operation as the metal band coating method according to claim 6 or 7, and is similar to the metal band coating method according to claim 6 or 7. The effect of can be obtained.

[0031]

Embodiments of the present invention will be described below in detail with reference to the drawings. In the following, the same components as those shown in FIGS. 4 to 6 are denoted by the same reference numerals, and description thereof will be omitted.

(First Embodiment) As described above,
In order to predict the paint adhesion amount, the value of the cell cross-sectional area A / the length R of the paint contact portion when the groove roll 1 is pressed against the metal strip 2, that is, when the pressure acts on the metal strip 2 from the groove roll 1. Is an important factor. Therefore, in the metal band coating method according to the present embodiment, the groove roll pressing force, which is the pressing force when the groove roll 1 is pressed against the metal band 2, and the cell cross-sectional area A and the paint contact portion length R are generally used. By clarifying the targeted relationship, it is possible to predict the paint adhesion amount even in various groove shapes.

The rubber groove roll 1 used in the present embodiment has a structure in which the outer peripheral surface of a cylindrical steel roll is covered with rubber. As the pressing force of the groove roll increases, the pressure acting on the metal band 2 from the groove roll 1 (hereinafter referred to as “metal band operating pressure”) also increases, but the deflection of the groove roll 1, the rubber material, the width of the metal band 2 The metal band operating pressure is different in each part where the groove roll 1 and the metal band 2 are in contact with each other due to the sheet thickness and the like, and particularly the metal band operating pressure is different in the width direction of the metal band 2.

When the metal band working pressure increases, the shape of the groove is deformed, whereby the paint contact length R decreases and the roll contact length H increases. As shown in the equation (2), the dimensionless pressure P1 is obtained by dividing the metal band operating pressure P by the pressure P0 for completely crushing the groove to make the dimensionless.

Dimensionless pressure P1 = P / P0 (2) The pressure P0 for completely crushing the groove is unambiguously determined from the shape of the groove when the metal band action pressure P is not applied and the contact elastic modulus. Can be sought.

As shown in the equation (3), the length H of the roll contact portion when the metal band action pressure P is applied is set before the metal strip action pressure P is applied and the groove roll 1 is set to the metal. Roll contact portion length H in contact with belt 2
Dividing by zero gives the dimensionless dimension roll contact portion length H1.

The dimensionless roll contact portion length H1 = H / H0 (3) Further, as shown in the equation (4), the paint contact portion length R when the metal strip action pressure P is applied is determined by the metal strip action. Pressure P
Is divided by the paint contact portion length R0 in the state where the groove roll 1 is in contact with the metal strip 2, and the dimensionless paint contact portion length R1 is obtained.

The dimensionless paint contact portion length R1 = R / R0 (4) Here, between the dimensionless roll contact portion length H1 and the dimensionless paint contact portion length R1, there is a formula (5). The relationship holds.

H1 = 1−R1 (5) FIG. 1 shows a dimensionless pressure P1 in various types of rubber groove rolls 1 having different groove shapes and rubber elastic moduli.
It is a figure which shows the relationship with dimensionless roll contact part length H1.

As shown in the equation (6), the cell cross-sectional area A when the metal strip operating pressure P is applied is changed before the metal strip operating pressure P is applied, and the groove roll 1 is changed to the metal strip. When divided by the cell cross-sectional area A0 in a state where the cell is in contact with 2,
The dimensionless cell cross-sectional area A1 is obtained.

Non-dimensional cell cross-sectional area A1 = A / A0 (6) FIG. 2 shows a non-dimensional pressure P1 and a non-dimensional cell cut in various types of rubber groove rolls having different groove shapes and rubber elastic moduli. It is a figure showing relation with area A1.

1 and 2 that the dimensionless roll contact portion length H1 and dimensionless cell cross-sectional area A1 can be generalized by dimensionless pressure P1. therefore,
The dimensionless cell cross-sectional area A1 is obtained from the dimensionless pressure P1 by a method such as function approximation.
A function F (P1) for obtaining the cell cross-sectional area A when the metal band operating pressure P is applied is obtained.

On the other hand, under various groove shapes and operating conditions, the paint film thickness h and the cell cross-sectional area A when the metal strip action pressure P is applied / the paint contact portion length before the metal strip action pressure P is applied. Examining the relationship with the value of R0, it can be seen that the paint film thickness h, assuming that the paint has been leveled to the non-paint contact area by leveling, can be determined by equation (7).

Paint film thickness h = C2 × (A / R0) = C2 × f (P1) / R0 (7) C2: constant Therefore, in the metal band coating method according to the present embodiment, first, the metal band operation is performed. The pressure P is defined as: groove roll pressing force, roll shape, longitudinal elastic modulus of rubber and Poisson's ratio,
Groove roll 1 such as width of metal strip 2 and thickness of metal strip 2
It is calculated analytically or experimentally from a factor affecting the contact state between the metal strip 2 and the metal strip 2.

Next, a dimensionless pressure P1 is obtained from the calculated metal band working pressure P, and the metal band working pressure P is applied from the obtained infinite pressure P1 using a function F (P1). The cell cross-sectional area A is obtained, and the obtained cell cross-sectional area A is obtained.
Is divided by the paint contact portion length R0 before applying the metal band working pressure P and multiplied by a constant C2 to obtain a paint film thickness h.
Is calculated, and the paint adhesion amount is predicted from the obtained paint film thickness h.

Then, the roll shape, rubber properties, metal strip 2
Thickness of the groove, the shape of the groove before applying the metal band operating pressure P (the paint contact portion length R0 before applying the metal band operating pressure P), and the cell cross-sectional area when the metal band operating pressure P is applied From factors that affect the contact state between the groove roll 1 and the metal band 2 such as A, a groove roll pressing force that establishes a paint adhesion amount that is a control target is obtained, and coating is performed using the obtained groove roll pressing force. .

As described above, in the metal band coating method according to the present embodiment, the metal band working pressure is determined from the factors affecting the contact state between the groove roll 1 and the metal band 2.
A paint film thickness h is obtained from the obtained metal band working pressure to predict a coating adhesion amount, and a groove roll pressing force for establishing a control target is obtained based on the predicted coating adhesion amount,
Since the coating is performed by the determined groove roll pressing force, the adhesion amount of the paint 3 in the non-paint contact portion where the paint 3 does not contact the metal strip 2 is reduced by the paint in the paint contact section where the paint 3 contacts the metal strip 2. It is possible to prevent the metal band 2 from being reduced as compared with the amount of adhesion, and to prevent the quality and the appearance of the painted metal band 2 from deteriorating.

Further, since it is not necessary to experimentally determine the amount of paint applied, the time and cost required for the experiment can be reduced. The metal band coating method according to the present embodiment is applied to a metal band coating device, and the metal band coating device is
Roll shape, rubber properties, target paint adhesion amount h, plate width of metal band 2, plate thickness of metal band 2, groove shape before metal band operation pressure P is applied (metal band operation pressure P is applied) Based on the factors that affect the contact state between the groove roll 1 and the metal strip 2, such as the previous paint contact portion length R0) and the cell cross-sectional area A when the metal strip operating pressure P is applied, the above method is used. By providing an arithmetic unit for obtaining an optimum groove roll pressing force and a control device for pressing the groove roll 1 against the metal band 2 by the groove roll pressing force obtained by the arithmetic unit, Even when the belt 2 is painted, the amount of the applied coating can be set to the target value, thereby preventing the quality and appearance of the painted metal band 2 from being deteriorated, and reducing the time and cost.

Further, in the metal band coating method and apparatus according to the present embodiment, the case where the groove of the groove roll 1 is mountain-shaped has been described as an example, but the present invention is not limited to this, and the groove is not limited to this. In this case, a similar effect can be obtained by a similar operation.

Further, the metal band coating method and apparatus according to the present embodiment can be variously modified without departing from the gist thereof. (Second Embodiment) In this embodiment, a modification of the first embodiment described above will be described.

In the first embodiment, the case where the paint is applied to the metal strip is described, but the present invention is not limited to this. That is, the present invention can be applied to a case where various liquids, such as a chemical conversion treatment liquid in which a substance such as silicon is contained in water, are applied to the metal band instead of the paint.

In the first embodiment, the case where the rubber covers the outer peripheral surface of the groove roll has been described. However, the present invention is not limited to this. Can be applied instead of

Further, in the metal strip coating method and apparatus according to the first embodiment, the metal strip operating pressure is controlled by the groove roll pressing force, the roll shape, the longitudinal elastic modulus and Poisson's ratio of rubber, the metal strip plate width, It is determined from factors that affect the contact state between the groove roll and the metal strip, such as the thickness of the metal strip.

However, the above factor may include the passing speed of the metal strip. Hereinafter, the reason for obtaining the metal strip working pressure in consideration of the passing speed of the metal strip will be described. Since the liquid passes through the groove between the groove roll and the metal strip, pressure is generated due to the viscosity of the liquid.

The liquid pressure acts on the macro roll deformation in addition to the groove roll pressing force which is forcibly applied from the outside. Further, the liquid pressure acts on the groove surface to increase the cell area.

Therefore, apparently, the calculation of the cell cross-sectional area is equivalent to the case where a force such that the liquid pressure is subtracted from the groove roll pressing force acts. Further, the liquid pressure increases as the plate passing speed increases (it naturally depends on the liquid physical properties and the viscosity coefficient, and the larger the viscosity coefficient, the larger).

That is, the liquid pressure has a property depending on the passing speed of the metal band, and when the groove roll pressing force is the same, the liquid pressure becomes larger as the passing speed of the metal band increases.

Therefore, when the passing speed of the metal strip changes, a metal strip action pressure suitable for obtaining a constant target adhesion amount is determined in consideration of a change in the liquid pressure. The groove roll pressing force is controlled so as to realize the pressure.

Thus, the liquid can be applied with higher accuracy in consideration of the liquid pressure. In the first embodiment and the present embodiment, the groove roll pressing force is controlled in order to uniformly control the amount of liquid adhesion. The amount of liquid adhering may be controlled by controlling the gap between the rotation axes of the groove rolls.

[0060]

【Example】

(Example 1) Hereinafter, the results of an experiment conducted for examining the accuracy of predicting the amount of paint adhesion in the metal band coating method according to the present invention will be described. This experiment was performed in a state where the steel sheet passing speed was 50 m / min.

In this experiment, a grooved roll having a structure in which the outer peripheral surface of a cylindrical steel roll was covered with rubber was used. The length of this grooved roll in the direction of the rotation axis was 2000 mm. Diameter is 300mm, inner diameter of cylindrical steel roll is 210mm, outer diameter is 260m
m, the thickness of the rubber is 20 mm.

Further, a steel plate having a thickness of 1.2 mm and a width of 1200 mm is used for the metal band to which the paint is applied.
Further, in this experiment, the groove roll pressing force was 2 tons, specific gravity 1.1, viscosity 8 cps, heating residue 1
8% of paint is used.

The groove of the groove roll has a mountain shape as shown in FIG. 3, and various combinations of the pitch L0 between the vertices and the depth d in the groove of the mountain shape are different from those of the painted steel plate. The amount of coating measured at the center of the width,
A comparison is made with the paint adhesion amount predicted using equation (2).

In the operation range of the present experiment, the constant C2 in the equation (2) was fixed at 0.47, and the metal zone working pressure was calculated analytically. Table 1 shows a comparison result between the measured paint adhesion amount and the predicted paint adhesion amount.

[0065]

[Table 1]

From the results shown in Table 1, the measured paint adhesion amount and the predicted paint adhesion amount are approximated at various pitches L0 and depths d, indicating the validity of the present invention. (Embodiment 2) Here, an experiment on the dependence on the passing speed of a steel sheet will be described.

In this experiment, the rubber hardness was 70 ° and the groove pitch was 0.
Using a groove roll having a groove depth of 55 mm and a groove depth of 0.11 mm and a groove roll pressing force (external pressing load) of 2 tons, the steel sheet passing speed is 30 m / m.
The average adhesion amount (average of the adhesion amount at both ends of the steel sheet and the center of the steel sheet) is measured when “in” and when the sheet passing speed is 80 m / min.

In this experiment, the passing speed was 30 m / m
Although the average adhesion amount of “in” was 1.82 g / m ² , the average adhesion amount at a passing speed of 80 m / min was 2.10 g / m ^2.
Met.

This is because the fluid pressure increases with an increase in the speed at which the steel sheet passes, and acts to push the groove of the groove roll, thereby increasing the amount of liquid adhering. Therefore, in order to achieve the target liquid adhesion amount with high accuracy, it is necessary to control the groove roll pressing force in consideration of the steel sheet passing speed.

[0070]

As described above, according to the liquid coating method, the metal band coating method and the metal band coating apparatus of the present invention, the metal band action, which is the pressure acting on each part where the groove roll and the metal band are in contact with each other. The pressure is determined from a factor that affects the contact state between the groove roll and the metal band, and the amount of liquid (paint) applied is predicted from the obtained metal band working pressure. Since the pressing force when pressing the groove roll against the metal band is controlled so that the liquid does not come into contact with the metal band, the adhesion amount of the liquid at the non-contact portion where the liquid does not come into contact with the metal band is reduced. It is possible to prevent the amount from being reduced as compared with the amount, and to prevent the quality and appearance of the metal band to which the liquid is applied from being deteriorated. Further, since it is not necessary to experimentally determine the amount of liquid attached, the time and cost required for the experiment can be reduced.

[Brief description of the drawings]

FIG. 1 is a view showing a relationship between a dimensionless pressure and a dimensionless contact portion length of various types of rubber groove rolls having different groove shapes and rubber elastic moduli.

FIG. 2 is a diagram showing a relationship between a dimensionless pressure and a dimensionless cell cross-sectional area in various types of rubber groove rolls having different groove shapes and rubber elastic moduli.

FIG. 3 is a diagram showing a state of a groove of a groove roll used in an experiment.

FIG. 4 is a conceptual diagram showing an example of a conventional metal band coating method.

FIG. 5 is a cross-sectional view showing an example of a relationship between a metal band and a paint after coating in a conventional metal band coating method.

FIG. 6 is a diagram showing an example of a deformed state of a groove when coating is performed by a rubber groove roll.

[Explanation of symbols]

 1: Groove roll 2: Metal band 3: Paint

Claims (8)

[Claims] 1. A groove roll having a groove formed on an elastic material covering an outer peripheral surface thereof is pressed against a continuously running metal strip, and a liquid supplied from outside into the groove of the groove roll is applied to the metal roll. In the liquid application method of applying to the band, a metal band working pressure that is a pressure acting on each portion where the groove roll and the metal band are in contact, a pressing force when pressing the groove roll against the metal band,
The shape of the groove roll, the physical properties of the elastic material, the shape of the metal band, and the like are determined from factors that affect the contact state between the groove roll and the metal band. Predicting the amount of liquid to be applied to the band, and controlling the pressing force when pressing the groove roll against the metal band so that the predicted amount of liquid to be applied becomes the target amount of liquid. A liquid application method characterized by the above-mentioned. 2. The liquid application method according to claim 1, wherein when the adhesion amount of the liquid applied to the metal band is estimated using the obtained metal band operation pressure, the obtained metal band operation pressure is used. Is calculated by dividing the groove roll groove pressure by a completely crushing pressure to obtain a dimensionless non-dimensional pressure.From the obtained non-dimensional pressure, using a predetermined approximation function, the metal band acting pressure is calculated. The area of the cell cross section, which is a cross section perpendicular to the running direction of the metal band in the space formed between the groove of the groove roll and the metal band when acting, is determined. The cell cross-sectional area when the metal band working pressure is not applied, and the boundary between the space and the metal band in the cell cross section in a state where the groove roll is in contact with the metal band. In Divided by the length of the liquid contact portion, seeking film thickness of the liquid over a constant which is determined in advance, the liquid coating method characterized by predicting the deposition amount of the liquid. 3. A groove roll formed by applying a groove to a rubber covering the surface of the outer peripheral surface portion is pressed against a continuously running metal strip, and paint supplied from outside into the groove of the groove roll is coated with the metal strip. In the metal band coating method of coating the metal band by applying to the metal band, the metal band working pressure is a pressure acting on each portion where the groove roll and the metal band are in contact with each other, the groove roll is applied to the metal band Pressing force when pressing against
The shape of the groove roll, the physical properties of the rubber, the shape of the metal band, and the like are determined from factors that affect the contact state between the groove roll and the metal band. Predicting the amount of paint to be applied to the metal strip, and controlling the pressing force when pressing the groove roll against the metal strip so that the predicted amount of paint to be applied becomes the target amount of paint. Features metal band coating method. 4. The metal strip coating method according to claim 3, wherein the determined metal strip action pressure is used to predict the amount of paint applied to the metal strip using the determined metal strip action pressure. The pressure is divided by the pressure to completely crush the groove of the groove roll to obtain a dimensionless pressure which is made dimensionless.From the obtained dimensionless pressure, using a predetermined approximation function, the metal band operating pressure is obtained. Determine the area of the cell cross section perpendicular to the running direction of the metal band in the space formed between the groove of the groove roll and the metal band when is acting, the metal band working pressure is The cell cross-sectional area when acting, before the metal strip working pressure is applied, and between the space and the metal strip in the cell cross-section in a state where the groove roll is in contact with the metal strip At the border That the value obtained by dividing the length of the paint contacting portion, seeking paint film thickness multiplied by a constant which is predetermined, the metal strip coating method characterized by predicting the coating weight. 5. A groove roll formed by applying a groove processing to a rubber covering a surface of an outer peripheral surface portion is pressed against a continuously running metal strip, and paint supplied from outside into the groove of the groove roll is coated with the metal strip. In the metal strip coating apparatus for coating the metal strip by applying to the metal strip, the metal strip working pressure is a pressure acting on each part where the groove roll and the metal strip are in contact, the groove roll is applied to the metal strip Pressing force when pressing against
Metal band working pressure calculating means, which is determined from factors that affect the contact state between the groove roll and the metal band, such as the shape of the groove roll, physical properties of the rubber, and the shape of the metal band; and the metal band working pressure calculating means. A paint adhesion amount estimating means for estimating the amount of paint applied to the metal band by using the metal band working pressure obtained by the method; and a paint adhesion amount predicted by the paint adhesion amount estimating means. A control means for controlling a pressing force when pressing the groove roll against the metal band so that the amount of the metal band adheres to the metal band. 6. The liquid applying method according to claim 1, wherein the metal band acting pressure is a pressing force when pressing the groove roll against the metal band, a passing speed of the metal band, and the groove. A liquid application method, wherein the liquid application method is obtained from factors that affect the contact state between the groove roll and the metal band, such as the shape of the roll, the physical properties of the elastic material, and the shape of the metal band. 7. The metal strip coating method according to claim 3 or 4, wherein the metal strip working pressure is a pressing force when pressing the groove roll against the metal strip, a passing speed of the metal strip, A metal band coating method, wherein the shape is determined from factors that affect the contact state between the groove roll and the metal band, such as the shape of the groove roll, the physical properties of the rubber, and the shape of the metal band. 8. The metal band coating apparatus according to claim 5, wherein the metal band operation pressure calculating means calculates the metal band operation pressure by a pressing force when pressing the groove roll against the metal band. A metal strip coating apparatus characterized in that the metal strip coating apparatus is determined from factors that affect a contact state between the groove roll and the metal strip, such as a threading speed, a shape of the groove roll, physical properties of the rubber, and a shape of the metal strip. .