JP2006075798A - Method and device for coating rod - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method and a device for coating a rod where, even in the case thin film coating is performed by using a coating film liquid in an amount of ≤5 cc/m<SP>2</SP>, the contact between a strip-like support and a rod for weighing can be prevented, thus defects are not generated on the surface of a coating layer, and which is particularly suitable for coating in the production of a planographic printing plate. <P>SOLUTION: The continuously running flexible strip-like support 14 is coated with the coating liquid in an amount exceeding a desired coating liquid amount from a liquid supply passage 10. Just after that, the coating face side of the strip-like support 14 is wrapped with a notch rod. The notch rod has a notch part 42A where the vicinity of the edge part on the downstream side in the rod wrap face at which the strip-like support 14 is wrapped is notched, and is fixed in such a manner that it is not rotated during the coating. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a rod coating method and apparatus, and more particularly, a coating for thin film coating without damaging the surface of a continuously running flexible belt-like support or the surface of a coating layer already coated on the belt-like support. Regarding technology.

  For example, there is a rod coating method disclosed in Patent Document 1 or an extrusion coating method disclosed in Patent Document 2 as a method for coating a coating coater on a belt-like support in a non-contact manner. Application methods are widely adopted.

  A lithographic printing plate is made by graining at least one surface of an aluminum belt-like support, which is a thin aluminum plate in a strip shape, and forming a visible light exposure type or laser exposure type photosensitive layer on the grained surface. It is manufactured by doing. The photosensitive layer is usually formed by applying a coating solution such as a photosensitive layer forming solution containing a photosensitive resin or a heat sensitive layer forming solution containing a thermopolymerizable resin on a grained surface and drying it. The photosensitive layer may have not only a single layer but also a multilayer structure composed of two or more layers. Further, an undercoat layer may be coated before the photosensitive layer, or polyvinyl alcohol may be formed on the photosensitive layer. In some cases, an oxidation protective layer made of, for example, is coated.

As shown in FIGS. 6 and 7, the conventional rod coating apparatus applies the coating liquid to the flexible belt-like support body 1 that runs continuously from the supply liquid supply channel 2 in excess of the desired coating liquid amount. Immediately after this, the final coating solution applied to the belt-like support 1 by wrapping the application surface side of the belt-like support 1 on a round rod-shaped rod 3 for measurement having a smooth surface rotating in the direction of the arrow. Weigh so that the amount becomes the predetermined amount of coating solution.
JP 2003-53236 A JP-A-5-261334

However, in the production of modern lithographic printing plate, the coating film liquid amount to be finally applied to a band-like support 1 5 cc / m ² or less (5 [mu] m or less as a coating film thickness), more 2 cc / m ² or less (coating film Since it has become necessary to apply a very thin film having a thickness of 2 μm or less), the problem arises that the belt-like support 1 and the round rod-shaped rod 3 for measurement come into contact with each other.

  That is, in the conventional rod coating apparatus, the thickness of the coating liquid that is attached to the belt-like support 1 from the liquid supply channel 2 and brought between the belt-like support 1 and the cylindrical rod 3, in other words, the belt-like support 1 When the gap amount (h) with the cylindrical rod is reduced to near the surface roughness of the belt-like support 1, the belt-like support 1 and the cylindrical rod 3 may come into contact with each other, thereby damaging the surface of the belt-like support 1. Or scratches and ripple streaks occur on the coating film surface.

  In particular, the higher the coating solution viscosity, the larger the amount of coating solution applied to the belt-like support 1. Therefore, in order to apply a thin film with a high-viscosity coating solution, the gap between the belt-like support 1 and the cylindrical rod 3 is used. Although the amount (h) is desired to be reduced to a range of 1 to 2 μm, the surface roughness Ra of the belt-like support 1 is usually about 1 to 2 μm, so that the belt-like support 1 and the cylindrical rod 3 come into contact with each other. . In addition, when a high-viscosity coating solution is applied as a thin film, ripple streaks occur on the entire surface of the coating film, and uneven coating thickness in the width direction of the belt-like support tends to occur. In order to eliminate the coating thickness unevenness, the tension in the running direction of the belt-like support 1 may be increased. However, when the tension is increased, the belt-like support 1 and the cylindrical rod 3 are more easily brought into contact with each other.

  This problem also applies to the extrusion coating method disclosed in Patent Document 2. That is, it is necessary to narrow the clearance between the extrusion coating head and the belt-like support to 10 μm or less, and the mechanical accuracy cannot be ensured, and the coating head tip and the belt-like support may contact each other.

The present invention has been made in view of such circumstances, and even when a coating film liquid amount is applied to a thin film to 5 cc / m ² or less, since the belt-like support and the measuring rod can be prevented from coming into contact with each other, An object of the present invention is to provide a rod coating method and apparatus suitable for coating in the production of a lithographic printing plate without causing defects on the coating layer surface.

  According to a first aspect of the present invention, in order to achieve the above object, immediately after the coating liquid is applied to the continuously running flexible belt-like support by the coating liquid adhering means in excess of the desired amount of the coating liquid, the belt-like support is provided. A rod that measures the final coating liquid amount applied to the belt-like support body to the desired coating liquid amount by wrapping the coating surface side of the body on a measuring rod having a smooth surface. In the coating method, the measuring rod has a cutout portion in which the vicinity of the downstream end of the rod wrap surface on which the belt-like support is wrapped is cut out, and is fixed so as not to rotate during coating. Provided is a rod coating method characterized by using a notched rod.

According to the first aspect of the present invention, the coating liquid applied to the belt-like support by the coating liquid adhering means in excess of the desired amount of the coating liquid is brought between the belt-like support and the measuring notch rod. However, since the notched rod does not rotate, the velocity of the coating liquid in the thickness direction of the coating liquid is formed between the belt-like support and the measuring rod. That is, the speed of the coating liquid close to the traveling belt-like support is high, the speed of the coating liquid close to the stationary rod is slow, and the slow-coating liquid is not accompanied by the travel of the belt-like support. It stays in the notch of the rod or falls from the notch. As a result, the present invention can reduce the amount of the desired coating solution to be finally applied even if the amount of the coating solution to be applied excessively by the coating solution adhering means is increased as compared with the conventional rod without notches. Therefore, for example, even when thin film coating is performed with a coating film liquid amount of 5 cc / m ² or less finally applied to the belt-shaped support, the amount of coating liquid brought between the belt-shaped support and the notch rod is increased. Since the gap amount between the belt-like support and the rod can be increased, the belt-like support and the notched rod do not come into contact with each other.

  In the present invention, the upstream side and the downstream side mean the upstream side and the downstream side as viewed from the traveling direction of the belt-like support, and the same applies hereinafter.

A second aspect of the present invention is characterized in that, in the first aspect, the final coating film liquid amount is a thin film coating of 5 cc / m ² or less. This is because the effect of the present invention can be further exhibited in such thin film coating. Further, the final coating film liquid amount capable of exhibiting the effects of the present invention is ² cc / m ² or less.

  According to a third aspect of the present invention, in the first or second aspect, a pair of support rollers are provided on the upstream side and the downstream side across the notch rod, and the belt-like support body is pressed against the notch rod by the support roller. And This is because, by pressing the belt-like support body to the notch rod with the support roller in this way, the coating thickness distribution in the width direction of the belt-like support body can be reduced, and the running fluff in the width direction can be made uniform. As a result, it is possible to form a thin coating film having a small film thickness distribution with no defects on the coating film surface.

  According to a fourth aspect of the present invention, in the third aspect of the present invention, the distance between the vertical line passing from the shaft center of the support roller and the vertical line passing through the rod wrap surface from the shaft core of the notch rod is within 30 mm. The support roller is arranged.

  This is because the shorter the distance between the notch rod and the support roller can suppress the run-out of the belt-like support, the coating thickness distribution in the width direction of the belt-like support can be further reduced, which is preferable. The distance is within 30 mm.

  A fifth aspect of the present invention is characterized in that, in any one of the first to fourth aspects, a tension in the traveling direction of the belt-like support is set to 50 kg / m or less. By setting the tension in the running direction of the belt-like support to 50 kg / m or less, contact between the belt-like support and the metering notch rod can be further prevented. In the case of a conventional cylindrical rod for measurement, it is difficult to apply a thin film unless the tension in the running direction of the belt-like support is increased, but in the present invention, the amount of coating liquid finally entrained by the belt-like support is conventionally reduced. Since it can be remarkably reduced as compared with the above, a thin film can be applied even if the tension in the running direction of the belt-like support is lowered.

  A sixth aspect of the present invention is characterized in that, in any one of the first to fifth aspects, the belt-like support is a support for a lithographic printing plate in which at least one surface of a continuous belt-like aluminum thin plate is grained. . This is because the effect can be more effectively exhibited by applying the present invention to the application in producing a planographic printing plate.

  According to a seventh aspect of the present invention, in order to achieve the above object, a coating liquid adhering means for adhering a coating liquid in excess of a desired coating liquid amount to a continuously running flexible belt-like support, and a downstream of the coating liquid adhering means A cutout rod having a cutout portion which is arranged adjacent to the side, has a smooth surface and has a cutout portion in the vicinity of the downstream end of the rod wrap surface on which the belt-like support is wrapped, and the cutout A fixing means for fixing the rod so as not to rotate during application, and an angle from the axis of the notch rod to the notch with respect to a vertical line passing through the rod wrap surface by rotating the notch rod when application is stopped And a notch position adjusting means for adjusting the position of the rod coating device.

  The seventh aspect constitutes the present invention as an apparatus.

According to the rod coating method and apparatus of the present invention, even when thin film coating is performed with a coating film liquid amount of 5 cc / m ² or less, the belt-like support and the measuring rod can be prevented from coming into contact with each other. Does not cause defects. Therefore, it is particularly suitable for application in the production of a lithographic printing plate.

  Hereinafter, preferred embodiments of a rod coating method and apparatus according to the present invention will be described in detail with reference to the accompanying drawings.

  FIG. 1 shows an example of a production line 10 for a lithographic printing plate stock provided with the rod coating apparatus of the present invention. The production line 10 will be described below as an example. The present invention is not limited to the production line 10 for a lithographic printing plate precursor, but can be applied to all lines where thin film coating is performed by rod coating.

  As shown in FIG. 1, a flexible belt-like support body 14 wound in a roll shape is set in the feeder 12. The belt-like support 14 continuously sent out from the feeder 12 is subjected to surface treatment in the surface treatment unit 16. The band-shaped support 14 subjected to the surface treatment is formed on the surface of the band-shaped support 14 in the undercoat coating / drying unit 20 after the backcoat layer is formed on the back surface of the support 14 in the backcoat layer coating / drying unit 18. An undercoat layer is formed. Next, after the photosensitive layer of the photopolymerizable composition is formed on the undercoat layer in the photosensitive layer coating / drying unit 22, the overcoat layer coating / drying unit 24 includes a water-soluble high-concentration group containing a hydrogen bonding group. An overcoat layer (PVA coating film) mainly composed of molecules such as PVA (polyvinyl alcohol) is formed, and the crystallinity of the water-soluble polymer in the formed overcoat layer is controlled within a predetermined range. Next, the overcoat layer is controlled in the humidity control zone 26 so that the moisture content of the overcoat layer is within a predetermined range, for example, 4 to 8%. The moisture content of the overcoat layer is measured online by the moisture analyzer 31, and the air conditioning unit 32 of the humidity control zone 26 controls the temperature and humidity of the overcoat layer humidity control zone so that the moisture content data becomes constant. Thereby, the original fabric 14A of the photopolymerizable lithographic printing plate is produced, and the original fabric 14A is wound around the winder 28.

  As the belt-like support 14 used in the present invention, dimensionally stable aluminum or an alloy thereof (for example, an alloy with silicon, copper, manganese, magnesium, chromium, zinc, lead, bismuth, nickel) can be used. Usually, conventionally known materials described in the 4th edition of Aluminum Handbook (1990, published by Light Metal Association), for example, JIS A 1050 material, JIS A 11 00 material, JIS A 3103 material, JIS A 3004 material, JIS A 3005 material or For the purpose of increasing the tensile strength, an alloy in which 0.1 wt% or more of magnesium is added can be used.

  As the surface treatment in the surface treatment unit 16, for example, when the belt-like support 14 is an aluminum plate, the surface is usually subjected to various treatments according to the purpose. As a general treatment method, an aluminum plate is first cleaned by degreasing or electrolytic polishing and desmut treatment. Thereafter, a mechanical surface roughening treatment and / or an electrochemical surface roughening treatment is performed to give fine irregularities on the surface of the aluminum plate. At this time, chemical etching treatment and desmut treatment may be further added. Thereafter, anodization is performed to increase the wear resistance of the surface of the aluminum plate, and then the surface of the aluminum is subjected to hydrophilic treatment and / or sealing treatment as necessary.

  In the back layer coating / drying section 18, a coating layer (back coat layer) made of an organic polymer compound is required on the back surface of the belt-like support 14 to prevent the photosensitive composition layer from being damaged when it is stacked. Provided accordingly.

  In the undercoat coating / drying unit 20, an undercoat layer coating solution is applied to the surface of the belt-like support 14 and dried as necessary to form an undercoat layer. As the method and conditions for application in the undercoat application / drying unit 20, many of the methods and conditions for applying a photosensitive composition layer described later can be used. In the photosensitive layer coating / drying unit 22, a photopolymerizable photosensitive composition paint is applied and dried on the undercoat layer to form a photosensitive layer. Then, in the overcoat layer application / drying unit 24, an overcoat layer paint is applied on the photosensitive layer.

  FIG. 2 is an overall view of the rod coating apparatus of the present invention, which can be used for any of the above-described backcoat layer coating, undercoat coating, photosensitive layer coating, and overcoat layer coating. Moreover, FIG. 3 is explanatory drawing explaining the notch rod mainly of a rod coating device.

  As shown in FIGS. 2 and 3, the rod coating device 40 is provided along the width direction of the belt-like support 14 continuously running in the direction of the arrow, and a notch rod 42 that is a measuring rod with a smooth surface. The rod support member 44 that supports the notched rod 42 from below, and a parallel coating liquid flow forming surface 46A provided on the upper surface of the rod support member 44 are provided in parallel to the rod support member 44 on the upstream side of the rod support member 44. The formed dam plate 46 and a base 48 to which the rod support member 44 and the dam plate 46 are fixed.

  The entire cutout rod 42 is formed in a cylindrical shape, but a cutout portion 42A is formed in which the vicinity of the downstream end of the rod wrap surface on which the belt-like support 14 is wrapped is cutout, It is fixed so that it does not rotate during application. Here, the rod wrap surface refers to the rod surface from the lap start position where the belt-like support 14 is wrapped by the notch rod 42 to the lap end position. The notch rod 42 does not rotate during application, but a straight line A passing from the axis O of the notch rod 42 to the edge position 42B of the notch and a vertical line B passing from the axis O to the rod wrap surface. The angle θ1 can be adjusted. The reason why the angle θ1 is adjusted is that, if the traveling angle of the belt-like support 14 with respect to the angle θ1 is not properly adjusted, a coating stripe is generated, and the angle θ1 is appropriately adjusted so as not to generate the coating stripe. A mechanism for fixing the notch rod 42 so as not to rotate during application and enabling the notch rod 42 to rotate when application is stopped is not particularly shown. For example, rotation provided at both ends of the notch rod 42 is provided. This can be achieved by supporting the shaft rotatably on the bearing and providing a lock means with ON-OFF for locking the rotation on the rotating shaft.

  As for the shape of the cutout portion 42A formed in the cutout rod 42, a cross-sectional V-shaped groove shape having a V-shaped angle of approximately 90 ° as shown in FIG. 1 may be formed in the entire rod length direction (FIG. 3). (See FIG. 4), or a cross-sectional L-shaped groove shape as shown in FIGS. 4A to 4B, a cross-sectional arc-shaped groove shape, or a semicircular cross-sectional shape as shown in FIG. The point is that the coating liquid not entrained by the belt-like support 14 stays uniformly in the width direction near the downstream end view of the rod wrap surface, or has a notch shape in which it smoothly flows down from the notch 42A. That's fine.

  As shown in FIG. 2, the belt-like support 14 travels while being pulled with a tension T in the traveling direction, and a pair of support rollers 52 and 54 are provided on the upstream side and the downstream side across the notch rod 42. The belt-like support 14 is pressed against the notched rod 42 by the support rollers 52 and 54. As a result, as shown in FIG. 2, the belt-like support body 14 is wrapped around the notch rod 42 in a shape bent in a “he” shape. The rod coating device 40 can be configured without using the support rollers 52 and 54. When the support rollers 52 and 54 are used, the pair of support rollers 52 and 54 are arranged so that the distance of the perpendicular C drawn from the shaft cores 52A and 54A of the support rollers 52 and 54 to the vertical line B is within 30 mm. It is preferable. Further, the angle formed by the upstream portion of the notch rod 42 and the downstream belt-like support 14, that is, the wrap angle θ <b> 2 is preferably in the range of 3 to 18 °, particularly preferably in the range of 5 to 10 °.

  As shown in FIG. 2, the rod support member 44 is a substantially plate-like member, and a concave groove 44A having an inner wall surface having a J-shaped cross section is formed on the upper surface. The notch rod 42 is supported from below in the concave groove 44A. The wall surface on the upstream side of the rod support member 44, that is, the wall surface facing the dam plate 46 is formed in a vertical plane. The dam plate 46 is a plate-like member extending in the vertical direction toward the belt-like support 14, and is fixed to the base 48 at the lower end portion, and a flat coating liquid flow forming surface 46 </ b> A is formed on the upper surface. .

  A slit-like liquid supply channel 50 is formed between the rod support member 44 and the weir plate 46, and this liquid supply channel 50 corresponds to the coating liquid adhesion means in the rod coating apparatus according to the present invention. . The liquid supply channel 50 communicates with a manifold 51 provided inside the base 48 at the lower end and is connected to a coating liquid storage tank 56 via a liquid supply pipe 53. The manifold 51 is formed in a small chamber shape and has a function of suppressing fluctuations in the flow rate of the coating liquid in the liquid supply flow path 50 when the supply flow of the coating liquid from the liquid supply pipe 53 varies. The liquid supply pipe 53 is provided with a liquid supply pump 58.

  Overflow reservoirs 60 and 62 for receiving the application liquid are formed upstream of the weir plate 46 and downstream of the rod support member 44 in the base 48, respectively, and are more than the desired amount of application liquid from the liquid supply channel 50. The coating liquid that did not adhere to the belt-like support 14, dropped on the side surface of the weir plate 46, accumulated in the overflow liquid reservoir 60, and dropped from the notch portion 42 </ b> A of the notch rod 42. The liquid accumulates in the overflow liquid reservoir 62. The coating liquid stored in these overflow liquid reservoirs 60 and 62 is returned to the coating liquid storage tank 56 via the return pipe 64. The return pipe 64 is provided with a return pump 66.

  Next, the operation of the rod coating apparatus 40 configured as described above will be described with reference to FIGS. 5 (A) and 5 (B). FIG. 5B is an enlarged view of a circled portion surrounded by a broken line in FIG.

  When the belt-like support 14 passes above the liquid supply channel 50, a part of the coating liquid is applied to the belt-like support 14 in excess of the desired amount of the coating liquid discharged upward from the liquid supply channel 50. It adheres and is transported toward the downstream side, and the remaining coating liquid falls from the side surface of the weir plate 46. Next, the coating liquid adhering to the belt-like support 14 is carried to the notch rod 42 which is a measuring rod as the belt-like support 14 travels, and is brought between the belt-like support 14 and the notch rod 42. Here, it is weighed to a desired coating liquid amount. If the notch rod 42 is not rotated during this measurement, as shown in FIG. 5 (B), the coating liquid brought in between the belt-like support 14 and the notch rod 42 is in the thickness direction of the coating liquid (in other words, Then, a velocity distribution is formed in the direction of the gap amount h between the belt-like support 14 and the notch rod 42). That is, the speed V1 of the coating liquid close to the belt-like support 14 that continuously travels is high, and the speed Vn of the coating liquid close to the rod surface of the notch rod 42 that is stopped without rotating is low. And since the notch rod 42 has the notch part 42A notched near the downstream edge part of the rod wrap surface where the strip | belt-shaped support body 14 is wrapped, the coating liquid near the notch rod 42 is It stays in the cutout portion 42A without being accompanied by the travel of the belt-like support body 14, or flows down from the cutout portion 42A as shown by a broken line arrow in FIG. As a result, it becomes possible to finally apply the coating liquid having a small amount of about 1/10 of the coating liquid brought in between the belt-like support 14 and the notch rod 42 to the belt-like support 14.

As a result, the present invention can reduce the amount of the desired coating liquid to be finally applied even if the amount of the coating liquid discharged from the liquid supply flow path 50 is increased as compared with the conventional rod having no notch. Therefore, for example, even when a thin film coating with a coating film amount of 5 cc / m ² or less finally applied to the belt-like support 14 is performed, the coating brought between the belt-like support 14 and the notch rod 42. Since the liquid can be increased to increase the gap amount h between the belt-like support 14 and the cutout rod 42, the belt-like support 14 and the cutout rod 42 do not come into contact with each other.

  Further, the final coating liquid on the belt-like support 14 can also be obtained by changing the wrap angle θ2, the traveling speed of the belt-like support 14, the viscosity of the coating liquid, the tension T applied to the belt-like support 14 and the diameter of the notch rod 42. Since the amount can be controlled, these factors may be controlled in accordance with the desired amount of coating solution. Therefore, if the rod coating apparatus 40 of the present invention is used, a lithographic printing plate having no defective portion can be stably produced.

  The rod coating apparatus 40 described in FIGS. 2 to 5 of the present invention and the conventional rod coating apparatus illustrated in FIGS. 6 and 7 were used to compare the quality of the coating film surface when thin film coating was performed.

  Comparative Example 1 is a conventional rod coating apparatus using a cylindrical rod with a diameter D of 10 mm without a cutout as a measuring rod, and 5 rpm in the same direction as the running direction of the belt-like support 14 running at 40 m / min. Rotated with

  Comparative Example 2 was a conventional rod coating apparatus, which was performed under the same conditions as Comparative Example 1 except that a cylindrical rod having a diameter D of 30 mm without notches was used as a measuring rod.

  Example 1 is a rod coating apparatus according to the present invention, which is provided with a notched rod 42 having a V-shaped cross section with a V-shaped angle of approximately 90 ° and a diameter D of 30 mm, and an angle θ1 of 10 Set to °. Further, the support rollers 52 and 54 were not used. The other conditions are the same as in Comparative Example 1.

  The second embodiment is a rod coating apparatus according to the present invention, and is the same as the first embodiment except that support rollers 52 and 54 are added to the first embodiment. In this case, the support rollers 52 and 54 are arranged so that the distance of the perpendicular line extending from the axis of the support rollers 52 and 54 to the vertical line B is 30 mm.

  In both examples and comparative examples, the width of the belt-like support 14 was 220 mm, and the running direction tension was 30 kg / m. The viscosity of the coating solution was 10 cP (0.01 Pas).

※は測定不可を意味する。また、ギャップ量とは帯状支持体とロッドとのギャップ量である。 Table 1 shows the test results of Examples and Comparative Examples.

* Indicates that measurement is not possible. The gap amount is the gap amount between the belt-like support and the rod.

  As can be seen from the results in Table 1, in Comparative Examples 1 and 2, scratches or ripple streaks occurred on the entire surface of the coating film, but in Examples 1 and 2, neither scratches nor ripple streaks occurred, which was good. The surface quality of the coating film could be obtained.

  Further, as can be seen from the comparison between Examples 1 and 2, in the rod coating device of the present invention, by providing the support roller, the thickness unevenness in the width direction of the belt-like support can be reduced.

The block diagram which shows an example of the manufacturing line of the raw material for lithographic printing plates provided with the rod coating device of this invention Side sectional view of the rod coating apparatus of the present invention The perspective view mainly explaining a notch rod of the rod application device of the present invention. Explanatory drawing which showed the mode of the shape of the notch part of a notch rod Explanatory drawing explaining the effect | action of a notch rod in the rod coating device of this invention Side sectional view of a conventional rod coating device Perspective view of a conventional rod coating device

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Production line of the raw material for lithographic printing plates, 12 ... Delivery machine, 14 ... Strip | belt-shaped support body, 16 ... Surface treatment part, 18 ... Backcoat layer application | coating / drying part, 20 ... Undercoat application | coating / drying part, 22 ... Photosensitivity Layer coating / drying unit, 24: Overcoat layer coating / drying unit, 26 ... Humidity adjustment zone, 28 ... Winding machine, 31 ... Moisture analyzer, 32 ... Air conditioning unit, 40 ... Rod coating device, 42 ... Notched rod 42A ... Notch portion, 42B ... Notch edge, 44 ... Rod support member, 46 ... Dam plate, 48 ... Base, 50 ... Liquid supply flow path, 51 ... Manifold, 52, 54 ... Support roller, 53 ... Supply Liquid pipe, 56 ... coating liquid storage tank, 58 ... liquid supply pump, 60, 62 ... overflow liquid reservoir, 64 ... return pipe, 66 ... return pump

Claims (7)

Immediately after the coating liquid is applied to the flexible belt-shaped support that continuously runs by the coating liquid adhering means in excess of the desired amount of the coating liquid, the coating surface side of the belt-shaped support is measured for a smooth surface. In a rod coating method for measuring the final coating liquid amount applied to the belt-like support by wrapping the rod-shaped rod so as to be the desired coating liquid amount,
As the measuring rod, a notch rod having a notch portion in which the vicinity of the downstream end of the rod wrap surface on which the belt-like support is wrapped is notched and fixed so as not to rotate during application is used. A rod coating method characterized by being used. ^2. The rod coating method according to claim 1, wherein the final coating film solution amount is a thin film coating of 5 cc / m < ² > or less.   The rod coating method according to claim 1 or 2, wherein a pair of support rollers are provided on an upstream side and a downstream side across the notch rod, and the belt-like support is pressed against the notch rod by the support roller. .   The pair of support rollers is arranged so that a perpendicular distance from the axis of the support roller to a vertical line passing through the rod wrap surface from the axis of the notched rod is within 30 mm. The rod coating method according to claim 3.   The rod coating method according to any one of claims 1 to 4, wherein a tension in the running direction of the belt-like support is set to 50 kg / m or less.   The rod coating method according to any one of claims 1 to 5, wherein the belt-like support is a support for a planographic printing plate in which at least one surface of a continuous belt-like aluminum thin plate is grained. A coating liquid attaching means for causing the coating liquid to adhere to the flexible belt-like support that runs continuously in excess of a desired amount of the coating liquid;
A notch part that is arranged adjacent to the downstream side of the coating liquid adhering means, has a smooth surface, and has a notch part in which the vicinity of the downstream end part of the rod wrap surface on which the belt-like support is wrapped is notched. A broken rod,
Fixing means for fixing the notched rod so as not to rotate during application;
A notch position adjusting means for rotating the notch rod when application is stopped and adjusting an angle from an axis of the notch rod to a notch with respect to a vertical line passing through the rod wrap surface; A rod applicator characterized.

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