JP2014171998A - Coating method and coating device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the uniform application of a coating liquid to the surface of a steel strip with productivity improved, when the coating liquid is continuously applied to the surface of the steel strip with rolls in a predetermined pattern.SOLUTION: A coating device comprises a pan tray 2 storing a coating liquid 3 such as resist ink, a gravure roll 4, an offset roll 5, a backup roll 6, and blades 7 and 8. A region in which a steel strip 1 on the backup roll 6 is wound is determined by a winding angle α(°) on a circular cross section perpendicular to the longitudinal direction of the backup roll 6. The relation of Tsin(α/2)/D>8.7×10is established among the winding angle α of the steel strip 1 to the backup roll 6, a diameter D (mm) of the backup roll 6, and tension T of the steel strip 1 (kg/mm).

Description

  The present invention relates to a coating method and a coating apparatus for continuously applying a resist ink to a strip-like cold-rolled steel strip for cold-rolled electrical steel sheets.

  Conventionally, grain-oriented electrical steel sheets are mainly used as a material for transformer cores, so that good magnetic properties are required. Further, when the grain-oriented electrical steel sheet is used as the iron core of the transformer, it is required to reduce the iron loss, particularly among the magnetic characteristics, in order to reduce the energy loss.

  As a method of reducing this iron loss, a method of increasing the electrical resistance of the steel sheet by increasing the content of silicon (Si), a method of highly aligning the crystal orientation to the (110) [001] orientation, and a thin plate. Attempts have been made to reduce the plate thickness. However, there is a limit to reducing iron loss only by a metallurgical method.

  Therefore, as a method of reducing iron loss, a method of artificially subdividing magnetic domains has been tried. Patent Document 1 discloses a method of irradiating a surface of a steel plate that has been subjected to finish annealing with a laser as a method for subdividing magnetic domains. However, in the method described in Patent Document 1, although there is an effect in improving the iron loss, since the magnetic domains are subdivided by the thermal strain introduced by the laser, the thermal strain is eliminated by strain relief annealing, There is a problem that the iron loss is deteriorated. In manufacturing a steel sheet for a wound core, strain relief annealing is an essential process. Therefore, it is difficult to employ the method described in Patent Document 1 as a method for reducing iron loss in grain-oriented electrical steel sheets.

  On the other hand, the technique described in Patent Document 2 is known as a technique that can suppress deterioration of iron loss even in the manufacture of grain-oriented electrical steel sheets that include strain relief annealing as a process. Patent Document 2 discloses a method in which a resist ink is linearly applied and patterned, and then the steel sheet is etched using the resist pattern as a mask, and the magnetic domain is subdivided by the formed linear grooves.

  Moreover, as a method for applying the resist ink to the linear pattern, an ink jet, a slot die coater, a gravure roll coater, or the like is generally used. For a base material that is hard and easily deformed, such as a steel plate, a coating method using a rubber roll that can follow the deformation of the steel plate by elastic deformation is suitable.

  In this resist ink application method using a rubber roll, the resist ink is applied to the surface of the steel sheet by the offset roll while the steel sheet is sandwiched between the offset roll in which the rubber is lined on the steel roll and the backup roll in which the steel sheet is wound. Since the resist ink is applied to the steel plate while being wound around the backup roll, the shape of the steel plate is corrected to a certain degree of smoothness, and the resist pattern is also applied to a smooth shape.

Japanese Patent Publication No.57-2252 Japanese Patent No. 2942074

  However, in the technique described in Patent Document 2, if the linear grooves in the resist pattern are crushed or broken at the stage of applying the resist ink, even if the steel sheet is etched, uniform linear grooves are not formed. Problems arise. In this case, the magnetic properties of the grain-oriented electrical steel sheet to be produced vary.

  Further, in the resist ink application method using a rubber roll, there arises a problem that the correction of the resist pattern becomes insufficient when the diameter of the backup roll, the winding angle around the backup roll, or the tension of the steel plate is changed. If the correction of the resist pattern is insufficient, so-called coating defects such as uncoated portions where the resist ink is not applied and groove crushing that causes the grooves in the resist pattern to be crushed occur on the surface of the steel sheet.

  Specifically, the inventor applied the resist ink coating method using the rubber roll described above, wound the steel plate around the backup roll, and applied the resist ink to the surface of the steel plate while correcting the shape of the steel plate. However, it was confirmed that the coating could be performed stably. However, when the conveying speed of the steel sheet as the line speed is increased, it has been found that the shape of the steel sheet becomes poor, and the tendency for coating defects such as uncoated portions and groove crushing to increase becomes significant. According to the study of the present inventor, the cause is that the transfer behavior of the coating part has been increased, and in order to form a uniform linear groove pattern, the surface is smoother than before. This is because the need has arisen.

  Furthermore, reduction in manufacturing cost is also demanded for a relatively expensive grain-oriented electrical steel sheet among thin steel sheets, and there is a demand for efficiency improvement by improving production speed. In order to improve the production speed, it is conceivable to increase the speed of the production line. However, when the speed of the production line is increased, there arises a problem that the coating ink is increased in the resist ink as described above.

  The present invention has been made in view of the above, and an object of the present invention is to improve the productivity while continuously applying the coating liquid on the surface of the steel strip in a predetermined pattern using a roll. An object of the present invention is to provide a coating method and a coating apparatus capable of uniformly coating the surface of a belt.

を成立させつつ塗布液を鋼帯に塗布することを特徴とする。 In order to solve the above-described problems and achieve the above object, the coating method according to the present invention is opposite to the rotation direction of the first roll while sandwiching the steel strip with the rotating first roll. A coating step of applying a coating solution adhering to the roll surface of the first roll to a steel strip partially wound around the roll surface of the second roll rotating in the direction, Between the winding angle α (°), the tension T (kg / mm ² ) of the steel strip, and the circular diameter D (mm) in the cross section perpendicular to the roll surface of the second roll,

The coating liquid is applied to the steel strip while establishing the above.

  In the coating method according to the present invention, in the above-described invention, in the coating step, the upstream portion along the plate passing direction of the steel strip from the coating position at which the coating liquid is applied from the first roll to the steel strip is The direction of the plate passing in a portion separated from the second roll on the downstream side along the plate passing direction of the steel strip while passing through other than the lower portion in the gravity direction of the first roll is −20 with respect to the direction perpendicular to the direction of gravity. It is characterized by an angle of not less than 20 ° and not more than 20 °.

  In the coating method according to the present invention, in the above invention, the coating liquid adhering to the roll surface of the third roll rotating in the direction opposite to the rotation direction of the first roll contacts the roll surface of the first roll. And a transfer step of transferring the coating liquid onto the roll surface of the first roll.

  In the above invention, the coating method according to the present invention further includes a scooping step of causing the coating liquid to adhere to the roll surface of the third roll by rotating the third roll.

  The coating method according to the present invention is characterized in that, in the above-described invention, the steel plate passing speed is 30 m / min or more.

  The coating method according to the present invention is characterized in that, in the above invention, the steel strip is a strip-shaped cold-rolled steel strip for electromagnetic steel sheets.

が成立するように構成されていることを特徴とする。 The coating apparatus according to the present invention is configured to be rotatable while bringing the roll surface into contact with the steel strip, and is capable of partially winding the steel strip with a first roll for coating the steel strip with a coating solution adhering to the roll surface. And a second roll that is configured to be able to sandwich a steel strip with the first roll and that rotates in a direction opposite to the rotation direction of the first roll. Between the winding angle α (°) of the steel strip around the roll of steel, the tension T (kg / mm ² ) of the steel strip, and the circular diameter D (mm) in the cross section perpendicular to the roll surface of the second roll,

It is comprised so that may be materialized.

  The applicator according to the present invention is the applicator according to the present invention, wherein the upstream portion along the plate passing direction of the steel strip from the application position where the first roll applies the coating liquid to the steel strip -20 ° or less and 20 ° or less with respect to the direction perpendicular to the direction of gravity with respect to the direction perpendicular to the gravitational direction while passing through the direction other than the lower side in the direction of gravity and downstream from the second roll along the direction of passing the steel strip It is comprised so that the angle of this may be made.

  The coating apparatus according to the present invention is configured so that the coating liquid can adhere to the roll surface in the above invention, and contacts the roll surface of the first roll, and the first roll on the contact surface with the first roll. It is characterized by further comprising a third roll that rotates in the direction opposite to the direction of rotation of the first roll and transfers the coating liquid onto the roll surface of the first roll.

  The coating apparatus according to the present invention is characterized in that, in the above-described invention, the sheet feeding speed of the steel strip is 30 m / min or more.

  The coating apparatus according to the present invention is characterized in that, in the above invention, the steel strip is a strip-shaped cold-rolled steel strip for electromagnetic steel sheets.

  According to the coating method and the coating apparatus according to the present invention, when the coating liquid is continuously applied to the surface of the steel strip in a predetermined pattern using a roll, the productivity is improved and the surface of the steel strip is uniform. It becomes possible to apply to.

FIG. 1 is a configuration diagram showing a main configuration of a resist coating apparatus according to a first embodiment of the present invention. FIG. 2 is a schematic diagram for explaining the winding angle of the steel strip with respect to the backup roll according to the first embodiment of the present invention. FIG. 3 is a flowchart for explaining a resist coating method according to the first embodiment of the present invention. FIG. 4 is a plan view showing a linear groove pattern formed on the steel strip surface according to the first embodiment of the present invention. FIG. 5 is a block diagram showing the main configuration of a resist coating apparatus according to the second embodiment of the present invention.

  Embodiments of the present invention will be described below with reference to the drawings. In all the drawings of the following embodiments, the same or corresponding parts are denoted by the same reference numerals. Further, the present invention is not limited to the embodiments described below.

(First embodiment)
First, a coating apparatus and a coating method according to the first embodiment of the present invention will be described. FIG. 1 shows a main configuration of a resist coating apparatus which is a coating apparatus according to the first embodiment.

(Resist coating device)
As shown in FIG. 1, the resist coating apparatus according to the first embodiment is an apparatus for applying a resist ink to a steel strip 1. The resist coating apparatus includes a pan 2 in which a coating liquid 3 such as resist ink is stored, a gravure roll 4, an offset roll 5, a backup roll 6, and blades 7 and 8.

  The gravure roll 4 as the third roll has a substantially cylindrical shape, is configured to be rotatable around a central axis along the longitudinal direction of the substantially cylindrical shape, and is formed of a curved surface in the substantially cylindrical shape. A part of the side surface is provided so as to be immersed in the coating liquid 3. The gravure roll 4 is configured to be able to scoop up the coating liquid 3 from the pan plate 2 as a liquid pool.

  Further, a groove is formed on a side surface (roll surface) of the gravure roll 4 formed of a cylindrical curved surface. The groove formed on the side surface has a shape based on a linear groove pattern transferred to the surface of the steel strip 1 described later. Specifically, the groove formed on the side surface on the curved surface side of the gravure roll 4 becomes a lattice shape or a linear shape when the linear groove pattern is transferred to the surface of the steel strip 1. It is formed as follows.

  The blade 7 as the first scraping means is made of a resin such as metal or rubber, for example, and is provided close to the roll surface of the gravure roll 4. Further, the blade 7 is provided downstream of the portion immersed in the coating liquid 3 and upstream of the position in contact with the offset roll 5 along the rotation direction of the gravure roll 4. The blade 7 scrapes off excessive coating liquid 3 uniformly from the surface of the gravure roll 4.

  Moreover, the offset roll 5 as a 1st roll is comprised from the rubber roll which lined elastic bodies, such as rubber | gum, for example in the column-shaped steel roll, for example as the lining thickness is 5 mm or more and 40 mm or less. The rubber hardness (Hs: Shore hardness) is, for example, not less than 40 Hs and not more than 95 Hs. When the rubber hardness is softened to less than 40 Hs, the deformation of the rubber becomes large, the linear grooves formed by the coating liquid 3 are crushed, and the linear grooves formed in the linear groove pattern transferred to the steel strip 1 tend to be defective. . On the other hand, if the rubber hardness is increased to be greater than 95Hs, it becomes impossible to follow the deformation of the steel strip 1, and uneven application of the coating liquid 3 is likely to occur. Thereby, the offset roll 5 is configured to follow the deformation of the steel strip 1 and not to wrinkle the surface of the steel strip 1.

  Further, the offset roll 5 is configured to be rotatable around a central axis along the longitudinal direction of the cylindrical shape, and a part of the curved surface of the cylindrical shape is not immersed in the coating liquid 3 of the gravure roll 4. It is in contact with the curved part. In this contact portion, the coating liquid 3 is transferred from the gravure roll 4 to the offset roll 5 in a linear groove pattern. The offset roll 5 transfers the transferred linear groove pattern coating liquid 3 to the surface of the steel strip 1.

  The blade 8 as the second scraping means is made of a resin such as metal or rubber, for example, and is provided close to the roll surface of the offset roll 5. The blade 8 is provided downstream of the transfer position of the coating liquid 3 to the steel strip 1 along the rotation direction of the offset roll 5. That is, the blade 8 is provided on the downstream side along the rotational direction of the offset roll 5 from the position where the steel strip 1 is sandwiched between the offset roll 5 and the backup roll 6 and on the upstream side from the position where the offset roll 5 contacts the gravure roll 4. It has been. The blade 8 scrapes off excess coating liquid 3 remaining after transfer from the surface of the offset roll 5.

  The backup roll 6 as the second roll has, for example, a substantially cylindrical shape, and is configured such that the steel strip 1 is brought into contact with a part of a side surface (roll surface) that is a curved surface, that is, can be wound. The steel strip 1 is sandwiched between the backup roll 6 and the offset roll 5 around which the steel strip 1 is partially wound, and the coating liquid 3 is transferred and applied to the steel strip 1 by the offset roll 5.

  With the above configuration, the relationship among the rotation directions of the gravure roll 4, the offset roll 5, and the backup roll 6 is as follows. That is, the rotation direction of the gravure roll 4 is opposite to the rotation direction of the offset roll 5. Further, the rotation direction of the offset roll 5 and the rotation direction of the backup roll 6 are opposite to each other, and any rotation direction is the same direction at a position where they contact each other.

  In addition, the resist coating apparatus is provided on the upstream side of the application position of the application liquid 3 by the offset roll 5 of the steel strip 1 and on the offset roll 5 side of the position where the offset roll 5 applies the application liquid 3 of the linear groove pattern. The belt 1 is configured not to be positioned. That is, in this coating apparatus, the steel strip 1 is passed through the offset roll 5 so as not to be positioned below the gravity direction. That is, the portion on the upstream side of the steel strip 1 along the plate passing direction allows the portion other than the portion below the gravity direction of the offset roll 5 to pass from the coating position of the coating solution 3. When the steel strip 1 passes the offset roll 5 side below the offset roll 5 in the direction of gravity, that is, along the horizontal direction with respect to the coating position of the coating liquid 3, the coating liquid 3 flowing along the surface of the offset roll 5 When the coating liquid 3 that has passed through the blade 8 falls, the dropped coating liquid 3 adheres to the surface of the steel strip 1. In this case, as a result, a coating defect of the linear groove pattern is formed on the surface of the steel strip 1, and the linear groove pattern is not uniformly formed on the surface of the steel strip 1.

  Further, in this resist coating apparatus, a portion of the steel strip 1 downstream of the coating position of the coating liquid 3 that is in contact with the offset roll 5 and not wound around the backup roll 6 is in a direction perpendicular to the gravity direction. An inclination β (°) is formed with respect to a certain horizontal direction. The inclination β (°) is preferably −20 ° to 20 ° (−20 ° ≦ β ≦ 20 °) with the upper side being positive with respect to the horizontal direction, and is −10 ° to 10 ° close to the horizontal. The following (−10 ° ≦ β ≦ 10 °) is more desirable. When the sheet passing direction of the steel strip 1 downstream of the coating position in the steel strip 1 and not wound around the backup roll 6 is set to a steep angle of less than −20 ° or more than 20 °, the coating liquid after coating is applied. 3 flows due to the leveling action. In this case, the defect that the non-application part in a linear groove pattern collapses or a part of non-application part connects will generate | occur | produce.

  FIG. 2 is a schematic diagram showing a region around which the steel strip 1 is wound on the roll surface of the backup roll 6 according to the first embodiment. As shown in FIG. 2, the region where the steel strip 1 is wound on the backup roll 6 is a radial line segment from the center in the circular cross section perpendicular to the longitudinal direction of the backup roll 6 toward both ends of the contact portion of the steel strip 1. Is defined by the angle α (°), that is, the winding angle α (°).

And in this 1st Embodiment, the winding angle (alpha) (degree) of the steel strip 1 with respect to the backup roll 6, the diameter D (mm) of the backup roll 6, and the tension T (kg / mm < ² >) of the steel strip 1 The relationship of the following expression (1) is established between

  If the winding angle α or the tension T of the steel strip 1 becomes smaller than the expression (1) is satisfied, the steel strip 1 is not corrected properly, so that the coating liquid 3 transferred to the surface of the steel strip 1 is applied. The unevenness becomes large and it becomes difficult to form a uniform linear groove pattern. When the formula (1) is established among the winding angle α of the steel strip 1 with respect to the backup roll 6, the diameter D of the backup roll 6, and the tension T of the steel strip 1, a resist formed on the surface of the steel strip 1 It becomes possible to apply a linear groove pattern made of As described above, the resist coating apparatus according to the first embodiment is configured.

(Resist application method)
Next, a coating method using the resist coating apparatus configured as described above will be described. FIG. 3 is a flowchart showing a resist coating method as a coating method according to the first embodiment.

  That is, as shown in FIG. 3, in the resist coating method according to the first embodiment, the coating liquid 3 is first scooped up (step ST1 in FIG. 3). Specifically, as shown in FIG. 1, a coating solution 3 made of a resist is supplied to the pan 2 by a conventionally known method. Subsequently, by rotating the gravure roll 4, the coating liquid 3 in the pan 2 is scooped up to the gravure roll 4.

  Next, the excess coating liquid 3 adhering to the roll surface of the gravure roll 4 is removed by the blade 7 (step ST2 in FIG. 3). Thereby, the coating liquid 3 on the roll surface of the gravure roll 4 is made uniform. A linear groove pattern is defined by the grooves formed on the roll surface of the gravure roll 4.

  Next, the coating liquid 3 on the surface of the gravure roll 4 is transferred to the offset roll 5 in a linear groove pattern (step ST3 in FIG. 3). The offset roll 5 transfers the linear groove pattern transferred from the gravure roll 4 to the surface of the steel strip 1 and applies the coating liquid 3 to the steel strip 1 (step ST4 in FIG. 3). Thereafter, the coating liquid 3 remaining on the roll surface of the offset roll 5 is removed by the blade 8 (step ST5 in FIG. 3).

  And the linear groove pattern which consists of a resist is formed over the whole surface of the steel strip 1 by performing the above steps ST1-ST5 repeatedly.

  FIG. 4 is a plan view showing an example of a linear groove pattern transferred from the above-described gravure roll 4 to the surface of the steel strip 1 via the offset roll 5. As shown in FIG. 4, the groove pattern formed on the roll surface of the gravure roll 4 is formed to be, for example, linear when the linear groove pattern is transferred to the surface of the steel strip 1. The linear groove pattern is not limited to a linear shape, and may be a lattice shape.

  And in this 1st Embodiment, the linear groove pattern transcribe | transferred on the surface of the steel strip 1 makes the predetermined angle (theta) with respect to the rolling direction (longitudinal direction) of the steel strip 1 in the transferred stage. It is a linear pattern extending in the width direction of the steel strip 1. When the predetermined angle θ of the linear groove pattern is less than 70 ° or greater than 110 ° with respect to the rolling direction (longitudinal direction) of the steel strip 1, the effect of magnetic domain subdivision in the steel strip 1 that becomes a directional electrical steel sheet is obtained. Not enough. Therefore, the predetermined angle θ is preferably, for example, 70 ° to 110 ° (70 ° ≦ θ ≦ 110 °).

  Moreover, the application | coating part 1a of the linear groove pattern in the surface of the steel strip 1 shown in FIG. 4 is the area | region of the predetermined length L along the longitudinal direction of the steel strip 1. FIG. If the predetermined length L along the longitudinal direction of the steel strip 1 in the coating portion 1a is less than 1 mm or exceeds 10 mm, the effect of subdividing the magnetic domain in the steel strip 1 cannot be sufficiently obtained. Therefore, the predetermined length L (mm) of the application part 1a is preferably 1 mm or more and 10 mm or less (1 mm ≦ L ≦ 10 mm).

  Furthermore, the non-application part 1 b of the linear groove pattern on the surface of the steel strip 1 is a linear region having a predetermined width d (μm) along the longitudinal direction of the steel strip 1. When the predetermined width d of the non-applied portion 1b is less than 10 μm, when the coating liquid 3 after application is leveled, it spreads to the non-applied portion 1b and divides the linear groove shape. On the other hand, when the predetermined width d of the non-applied portion 1b is larger than 500 μm, the effect of subdividing the magnetic domain in the steel strip 1 cannot be sufficiently obtained. Therefore, the predetermined width d along the longitudinal direction of the steel strip 1 in the non-application part 1b is preferably 10 μm or more and 500 μm or less (10 μm ≦ d ≦ 500 μm).

(Examples 1-15 and Comparative Examples 1-12)
Next, Examples 1 to 15 based on the first embodiment described above and Comparative Examples 1 to 12 for comparison with the effects of Examples 1 to 15 will be described.

  First, in Examples 1 to 15, using the resist coating apparatus shown in FIG. The linear groove pattern was applied under various coating conditions, and the coating appearance after drying was evaluated. The gravure roll 4 is a grooved roll with hard chrome casting, and the offset roll 5 is a rubber roll lined with a rubber having a rubber hardness of 80 Hs and a rubber lining thickness of 20 mm. Moreover, the groove | channel shape of the gravure roll 4 makes the width | variety of the non-application part along a rotation direction 100 micrometers, and sets the width | variety of an application part to 3 mm. Furthermore, the roll diameters of the gravure roll 4 and the offset roll 5 are both 250 mm. The used coating solution was a resist ink diluted with ethylene glycol monobutyl ether containing an alkyd resin as a main component and having a viscosity at 20 ° C. of 1500 mPa · s. In addition, the steel plate 1 shown in FIG. 1 has a sheet passing direction in which the inclination β is 0 °, that is, in the horizontal direction, and the inclination is −20 ° or more even when the steel band 1 is slack. It was made to be below °. On the other hand, in Comparative Examples 1-12, compared with the application | coating conditions in Examples 1-15, it was set as the conditions in which (1) Formula is not materialized.

Table 1 shows the coating conditions and results of Examples 1 to 15 and Comparative Examples 1 to 12. The electrolytic etching using the linear groove pattern as a mask was performed for 30 seconds in a sodium chloride (NaCl) electrolyte solution with a current density of 10 A / dm ² . Moreover, the appearance evaluation after application | coating of a linear groove | channel pattern cut out the steel strip 1 after drying, and performed by visual observation and microscope observation. Regarding the appearance evaluation, “◎” (good) is obtained for the case where a uniform linear groove is obtained, “○” (good) for the case where a slight distortion occurs in the linear groove, and linear The case where there was a break in the groove was marked “x” (impossible). W _17/50 indicates the iron loss value when the maximum magnetic flux density is 1.7 T when excitation is performed at a frequency of 50 Hz using a magnetometer.

  From Table 1, in Examples 1 to 15 in which the formula (1) is established, the external appearance is “」 ”or“ ◯ ”, whereas the comparative examples 1 to 12 in which the formula (1) is not established. It can be seen that the appearance is “◯” or “×”. That is, it can be seen that when the formula (1) is not established, the shape of the linear groove pattern transferred to the surface of the steel strip 1 becomes defective.

  Moreover, from Table 1, like the line speed of the steel strip 1 in Examples 1-15, it is larger than the line speed of the steel strip 1 in Comparative Examples 1-12, and also when it is specifically set to 30 m / min or more. It can be seen that the linear groove pattern can be satisfactorily formed. That is, in Examples 1 to 15 according to the first embodiment, it is understood that the resist ink can be transferred to the surface of the steel strip 1 with a high-speed and uniform linear groove pattern in the application of the resist ink using the offset roll 5. . On the other hand, it can be seen from Table 1 that in Comparative Examples 1 to 12, the shape of the linear groove pattern transferred to the surface of the steel strip 1 becomes poor. Also, from Table 1, it is necessary to reduce the line speed of the steel strip 1 in order to make the shape of the linear groove pattern slightly distorted (“◯”). You can see that

(Examples 16 to 19 and Comparative Examples 13 to 16)
Next, Examples 16 to 19 based on the first embodiment and Comparative Examples 13 to 16 for comparison with the effects of these Examples 16 to 19 will be described.

  First, in Examples 16 to 19, a roll having a roll diameter of 50 mm and a length (surface length) along the longitudinal direction of 100 mm is used as the gravure roll 4 of the resist coating apparatus shown in FIG. The steel strip 1 is a steel plate cut plate having a plate thickness of 0.23 mm and 300 × 250 mm. Then, a resist ink was applied on a surface inclined with respect to the surface of the steel strip 1 and left for 3 seconds while maintaining the inclination, and then the dried coating appearance was evaluated. The groove shape of the gravure roll 4 is such that the width of the non-application portion along the rotation direction is 100 μm and the width of the application portion is 3 mm.

Table 2 shows the coating conditions and results of Examples 16 to 19 and Comparative Examples 13 to 16. The electrolytic etching using the linear groove pattern as a mask was performed for 30 seconds in a sodium chloride (NaCl) electrolyte solution with a current density of 10 A / dm ² . Moreover, the appearance evaluation after application | coating of a linear groove | channel pattern cut out the steel strip 1 after drying, and performed by visual observation and microscope observation. In addition, “◎” (good) is obtained for the case where a uniform linear groove is obtained with respect to the appearance evaluation, “○” (good) for the case where the linear groove is slightly distorted, and the linear groove. In the case where there is a discontinuity, “×” (impossible) was assigned. In Table 2, B ₈ indicates the magnetic flux density when the magnetizing force is 800 A / m.

  From Table 2, it can be seen that the appearance becomes poor when the inclination angle is larger than 20 ° and 25 ° or more. That is, after applying the linear groove pattern, that is, when the angle in the sheet passing direction of the steel strip 1 on the downstream side of the application position of the application liquid 3 in the resist application apparatus is sharpened by being less than −20 ° or more than 20 °. It can be seen that the linear groove pattern cannot be formed uniformly and it is difficult to form a uniform groove in the steel strip 1.

  According to the first embodiment described above, when the coating liquid 3 such as resist ink is continuously applied to the surface of the steel strip 1, a uniform line is formed on the surface of the steel strip 1 while improving productivity. The groove pattern can be formed by transferring.

(Second Embodiment)
Next, a second embodiment of the present invention will be described. FIG. 5 is a block diagram showing a resist coating apparatus according to the second embodiment.

  As shown in FIG. 5, in the resist coating apparatus according to the second embodiment, unlike the first embodiment, the direction of the plate of the steel strip 1 on the upstream side from the coating position of the coating liquid 3 is set vertically downward. Yes. And the rotation direction of the gravure roll 4, the offset roll 5, and the backup roll 6 turns into the opposite direction in the case of 1st Embodiment with the difference in the direction of this plate | board of the steel strip 1. FIG.

  Further, the blade 7 that scrapes off the excess coating liquid 3 on the roll surface of the gravure roll 4 is disposed upstream of the position in contact with the offset roll 5 along the rotation direction of the gravure roll 4 and on the coating liquid 3 of the gravure roll 4. It is provided on the downstream side of the immersed position. Further, the blade 8 that scrapes off the coating liquid 3 remaining on the roll surface of the offset roll 5 comes into contact with the steel strip 1 on the upstream side in the rotation direction of the offset roll 5 from the contact position with the gravure roll 4. It is provided on the downstream side of the coating position where the coating liquid 3 is transferred. Since other configurations are the same as those in the first embodiment, the description thereof is omitted.

  Also in the second embodiment, the same effect as that of the first embodiment can be obtained, and further, the direction of the passing plate of the steel strip 1 upstream of the application position of the coating liquid 3 in the steel strip 1 is changed. By being vertically downward, even when the coating liquid 3 drips from the offset roll 5 or the like, it can be prevented from adhering to the portion where the linear groove pattern of the steel strip 1 is formed and becoming defective. .

  As mentioned above, although embodiment of this invention was described concretely, this invention is not limited to the above-mentioned embodiment, Various deformation | transformation based on the technical idea of this invention is possible. For example, the numerical values given in the above embodiment are merely examples, and different numerical values may be used as necessary.

DESCRIPTION OF SYMBOLS 1 Steel strip 1a Application | coating part 1b Non-application | coating part 2 Pan dish 3 Coating liquid 4 Gravure roll 5 Offset roll 6 Backup roll 7,8 Blade

Claims (11)

While sandwiching the steel strip with the rotating first roll, the steel strip partially wound around the roll surface of the second roll rotating in the direction opposite to the rotation direction of the first roll, An application step of applying an application liquid adhering to the roll surface of the first roll;
The winding angle α (°) of the steel strip around the second roll, the tension T (kg / mm ² ) of the steel strip, and the circular diameter D (mm in a cross section perpendicular to the roll surface of the second roll )

The coating solution is applied to the steel strip while establishing the above.   In the coating step, a portion on the upstream side along the plate passing direction of the steel strip from the coating position where the coating solution is applied from the first roll to the steel strip is below the gravity direction of the first roll. , And the passing plate direction in the portion separated from the second roll on the downstream side along the passing plate direction of the steel strip is -20 ° or more and 20 ° or less with respect to the direction perpendicular to the direction of gravity. The coating method according to claim 1, wherein the angle is set as follows.   The coating surface adhering to the roll surface of the third roll rotating in the direction opposite to the rotation direction of the first roll is brought into contact with the roll surface of the first roll to roll the surface of the first roll. The coating method according to claim 1, further comprising a transfer step of transferring the coating solution onto the substrate.   The coating method according to claim 3, further comprising a scooping step of causing the coating liquid to adhere to a roll surface of the third roll by rotating the third roll.   The coating method according to any one of claims 1 to 4, wherein a passing speed of the steel strip is set to 30 m / min or more.   The resist coating method according to any one of claims 1 to 5, wherein the steel strip is a strip-shaped cold-rolled steel strip for electromagnetic steel sheets. A first roll configured to rotate while contacting a roll surface to a steel strip, and applying a coating solution adhering to the roll surface to the steel strip;
The steel strip is configured to be partially wound, and is configured to be able to sandwich the steel strip with the first roll, and rotates in a direction opposite to the rotation direction of the first roll. A second roll that
The winding angle α (°) of the steel strip around the second roll, the tension T (kg / mm ² ) of the steel strip, and the circular diameter D (mm in a cross section perpendicular to the roll surface of the second roll )

An applicator characterized in that is formed.   From the application position where the coating liquid is applied to the steel strip by the first roll, a portion on the upstream side along the plate passing direction of the steel strip passes through other than the lower part in the gravity direction of the first roll. The sheet passing direction in the portion separated from the second roll on the downstream side along the sheet passing direction of the steel strip forms an angle of -20 ° or more and 20 ° or less with respect to the direction perpendicular to the direction of gravity. The coating apparatus according to claim 7, wherein the coating apparatus is configured.   The coating liquid is configured to be able to adhere to the roll surface, and contacts the roll surface of the first roll, and rotates in a direction opposite to the rotation direction of the first roll on the contact surface with the first roll. The coating apparatus according to claim 7, further comprising a third roll that transfers the coating liquid onto a roll surface of the first roll.   The coating apparatus according to any one of claims 7 to 9, wherein a passing speed of the steel strip is 30 m / min or more.   The said steel strip is a strip | belt-shaped cold-rolled steel strip for electromagnetic steel plates, The coating device of any one of Claims 7-10 characterized by the above-mentioned.

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