JP2007182033A - Coated metal sheet and its manufacturing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To efficiently form a coating film, which is enhanced in design properties having a streak-like uneven pattern, on the surface of a metal sheet by a simple technique without requiring the skill of a worker. <P>SOLUTION: Coating is applied to the surface of the metal sheet 1 while continuously feeding the metal sheet 1. Liquid outer layer coating 2 is applied to the surface of the metal sheet 1 on the feed route of the metal sheet 1. An unevenness forming jig 4 having a large number of projections 3 is brought into slide contact with the uncured outer layer coating 2 on the metal sheet 1. Subsequently, the outer layer coating 2 is cured to be formed into a film to form an outer layer coating film 5 having the streak-like uneven pattern. By only arranging the unevenness forming jig during the continuous coating process of the metal sheet 1, the outer layer coating film 5, which is enhanced in design properties having the streak-like uneven pattern can be formed by utilizing the continuous feed of the metal sheet 1. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a method for producing a painted metal plate and a painted metal plate that can be used for building materials and the like, and more particularly to a technique for obtaining a painted metal plate having excellent coating design.

  Conventionally, the surface of building materials such as exterior materials has been given various design patterns to improve the appearance, and one such design pattern is applied to the paint film surface of the painted building material. A streak-like concavo-convex pattern is applied. As a method for applying such a pattern to the coating film surface, after applying paint to the surface of a structural material at a construction site or the like, an operator uses a rake-shaped jig to set the coating film surface before the paint is cured. Scratching is performed (see Patent Document 1).

  However, in order to apply a concavo-convex pattern to the coating film on the surface of the building material with such a technique, it requires skill of the operator, and with such a technique, it is difficult to narrow the interval between the streaks, It was difficult to form a fine pattern. In addition, since painting and pattern formation work is required at the construction site, complicated work is required.

  On the other hand, as a metal plate material used for building materials, etc., stainless steel plate, hot dip galvanized steel plate, aluminum zinc alloy plated steel plate, etc. are pre-coated to improve functionality such as corrosion resistance and to improve appearance. A painted metal sheet is provided.

Therefore, if such a coated metal plate is coated in advance with a coating film having a streak-like uneven pattern, and such a coated metal plate is used as a construction material, etc., work for painting and patterning at a construction site However, conventionally, as a method of forming a concavo-convex pattern on a painted metal plate, a method of forming a shrinkage concavo-convex pattern using beads or a shrink paint (see Patent Document 2), Although a method for embossing a coated film after film formation (see Patent Document 3) has been proposed, a method for efficiently forming a streaky uneven pattern on the coated film has not yet been devised. It was.
JP 2005-7288 A JP-A-11-104559 Japanese Patent Laid-Open No. 11-309807

  The present invention has been made in view of the above points, and a highly-designed coating film having a streak-like concavo-convex pattern on the surface of a metal plate can be efficiently obtained by a simple method without requiring operator skill. It is an object of the present invention to provide a method for producing a coated metal plate that can be well formed and a coated metal plate.

  The method for producing a coated metal plate according to the present invention is a method for producing a coated metal plate in which the surface of the metal plate 1 is coated while continuously conveying the metal plate 1, and is on the conveyance path of the metal plate 1. Then, after applying the liquid outer layer coating 2 on the surface of the metal plate 1, the uneven forming jig 4 having a plurality of protrusions 3 is brought into sliding contact with the uncured outer layer coating 2 on the metal plate 1, and then It includes a step of forming the outer layer coating film 5 having a streak-like uneven pattern by curing the outer layer coating material 2 to form a film. Thereby, the metal plate 1 is continuously conveyed only by disposing the unevenness forming jig 4 during the continuous coating process of the metal plate 1, and has a high design property having a streaky uneven pattern. The outer layer coating film 5 can be formed, and such a concavo-convex pattern can be efficiently formed by a simple method without requiring operator skill.

  The plurality of protrusions 3 can be arranged with different arrangement positions in the transport direction of the metal plate 1. If it does in this way, it becomes easy to arrange | position the processus | protrusion 3 so that the space | interval of the direction orthogonal to the conveyance direction of the metal plate 1 of adjacent processus | protrusion 3 may become short, and it forms in the outer layer coating film 5. The uneven pattern can be easily miniaturized.

  As described above, when the protrusions 3 are arranged at different positions in the transport direction of the metal plate 1, the protrusion row 6 composed of the plurality of protrusions 3 arranged in a row in the unevenness forming jig 4 is made of metal. Plural rows can be provided with different arrangement positions of the plate 1 in the conveying direction.

  When a plurality of protrusion rows 6 are provided, the interval between the adjacent protrusions 3 in each protrusion row 6 may be varied for each protrusion row 6. In this case, in the entire concavo-convex forming jig 4, the interval in the direction orthogonal to the conveying direction between the protrusions 3 is periodically changed, so that a concavo-convex pattern rich in change can be formed on the outer layer coating film 5.

  Moreover, as the said outer layer coating material 2, the thing containing a coloring material can be used. If it does in this way, a color can be provided to the outer layer coating film 5, and a high designability can be provided in combination with the concavo-convex pattern.

  As said coloring material, what contains a metal powder at least can be used. In this case, a metallic appearance can be imparted to the outer layer coating film 5, and the light-reflecting property of the outer layer coating film 5 can be improved so that the concavo-convex pattern can be seen very clearly. Can be further improved.

  Furthermore, as said metal powder, a scale-like thing can be used. In this case, when the concavo-convex forming jig 4 is brought into sliding contact with the outer layer paint 2 on the surface of the metal plate 1, the arrangement of the scaly metal powder is disturbed in the sliding contact portion, and the light reflectivity is greatly changed. Such a portion having changed light reflectivity is formed in a streak shape along the concavo-convex pattern, so that the streak pattern can be more clearly visually recognized and the design is further improved. be able to.

  In addition, after forming the outer layer coating film 5, the clear coating film 7 may be formed on the surface of the outer layer coating film 5. In this way, even if a portion with a thin coating film thickness is formed by forming an uneven pattern on the outer coating film 5, the clear coating film 7 forms a sufficiently thick entire coating film on the coated metal plate. It is possible to improve the coating performance such as chemical resistance and weather resistance, and even if the clear coating film 7 is formed in this way to form the coating film surface smoothly, the clear coating film 7 is watermarked. Thus, the uneven pattern of the outer coating material 2 can be visually recognized, and an excellent design can be expressed.

  Further, an intermediate coating film 8 may be formed on the surface of the metal plate 1 before the outer coating film 5 is formed. In this case, the coating film performance such as corrosion resistance, weather resistance, chemical resistance, etc. on the coated metal sheet. This is particularly suitable when a coated metal plate is used as an exterior building material.

  Moreover, it is also preferable to expose the base of the outer layer coating film 5 on the bottom surface of the recess 13 of the outer layer coating film 5 formed at the position where the unevenness forming jig 4 is in sliding contact. In this case, a higher design property can be imparted by exposing the base color to the bottom surface of the recess 13.

  According to the present invention, it is possible to efficiently produce a coated metal plate having a high design appearance in which a streaky uneven pattern is preliminarily attached to an outer layer coating film by a simple method, and to form such an uneven pattern In addition, it is not necessary to perform work for painting or patterning at a construction site or the like, and such a concavo-convex pattern can be formed without requiring operator skill.

  Hereinafter, the present invention will be described based on the best mode for carrying out the invention.

  Although it does not restrict | limit especially as the metal plate 1 used by this invention, For example, aluminum-galvanized steel plates, such as an aluminum plating steel plate, a galvanization steel plate, a Galvalume steel plate (trademark), a stainless steel plate etc. are mentioned. it can. Moreover, as such a metal plate 1, a long thing can be used.

  When coating the metal plate 1, the metal plate 1 is fed from a payoff roll in which the metal plate 1 is wound in a coil shape and conveyed, and various treatments are performed. It is possible to carry out by a continuous processing step of cutting to a size of 1 or winding it again in a coil shape without cutting.

  In such a coating process on the metal plate 1, prior to coating, chemical treatment such as chromate treatment or zinc phosphate treatment, removal of dirt such as oil and grease on the surface of the metal plate 1, etc., as necessary. After that, the outer layer coating is applied.

  Further, an appropriate undercoat film 15 is formed on the metal plate 1 as necessary prior to the outer layer coating (see FIGS. 6A to 6D), or further, an appropriate intermediate coat film is formed. 8 can be formed (see FIGS. 6C and 6D).

  When the undercoat coating film 15 is formed, examples of the paint (undercoat paint) include a thermosetting resin varnish such as an epoxy resin varnish, an epoxy urethane resin varnish, and a polyester resin varnish, titanium oxide, fine powder clay, calcium carbonate, and the like. An epoxy resin-based paint in which extender pigments, rust preventive pigments and the like are dispersed can be used. As the rust preventive pigment, for example, pigments mainly composed of chromates such as strontium chromate and calcium chromate can be used. In undercoating, an undercoating material having such a composition is applied to one surface of the metal plate 1, and in some cases, the undercoating material is applied to the other surface of the metal plate 1. Further, a back coating material having a composition different from that of the undercoat paint may be applied to the other surface of the metal plate 1. Application of the undercoating material or the back coating material can be performed by an appropriate application device composed of dipping, spraying, brushing, roll coater, air knife, electrostatic coating or the like.

  After applying the undercoat paint, the metal plate 1 can be baked and cured by continuously passing the metal plate 1 through a heating furnace or the like to form the undercoat coating film 15.

  The thickness of the undercoat coating film 15 is not particularly limited and is appropriately set, but is preferably in the range of 3 to 25 μm.

  When the intermediate coating film 8 is formed, an appropriate liquid coating material for pre-coating can be used as the coating material (intermediate coating material). For example, a thermosetting coating material such as polyester, urethane, alkyd, etc. Alternatively, fluorine-based, acrylic-based, vinyl chloride-based thermoplastic paints can be used. The application of the intermediate coating can be performed by an appropriate application device composed of dipping, spraying, brushing, roll coater, curtain coater, air knife, electrostatic coating, etc. If necessary, the metal plate 1 can be baked and cured by continuously passing it through a heating furnace or the like to form the intermediate coating film 8. At this time, the thickness of the intermediate coating film 8 is appropriately adjusted, but the dry coating film thickness is preferably 5 to 40 μm, particularly preferably 10 to 30 μm. When such an intermediate coating film 8 is formed, the coating film performance such as corrosion resistance, weather resistance, chemical resistance, and concealment on the coated metal plate can be improved within the range of the coating film thickness to which the coating can be applied. In particular, it is suitable when a coated metal plate is used as an exterior building material.

  When the outer coating is applied to the metal plate 1, as the coating (outer coating 2), an appropriate liquid coating for pre-coating can be used in the same manner as the intermediate coating, for example, polyester, urethane, alkyd Thermosetting paints such as fluorine-based, acrylic-based, and vinyl chloride-based thermoplastic paints can be used.

  Moreover, as this outer layer coating material 2, it is preferable to use a coating material containing a coloring material such as an appropriate pigment. Examples of such a colorant include titanium oxide, carbon black, iron oxide yellow, iron oxide red (Bengara), aluminum flake, mica flake, colored glass flake, and organic blue (phthalocyanine blue). Examples of the dye include “AIZEN SPILON dye series” manufactured by Hodogaya Chemical Co., Ltd. The blending ratio of such a colorant in the outer layer coating material 2 can be in an appropriate range, but is usually preferably 0.1 to 40% by weight, particularly preferably 0.5 to 35% by weight.

  In particular, by adding metal powder such as aluminum powder, nickel powder, copper powder or the like as a pigment in the outer layer paint 2, a metallic appearance can be imparted to the coating film. The metal powder includes a powder of a composite of a metal and an inorganic material such as glass powder coated with metal. Further, the uneven pattern on the surface of the outer coating film 5 is visually recognized based on a change in the light reflection direction on the surface of the outer coating film 5 which is mainly caused by having a streaky uneven pattern. When the light reflectivity of the outer layer coating film 5 is improved by containing the light, the change in the light reflection direction as described above can be seen very clearly by the viewer, and the design is further improved. It is something that can be done.

  As such a metal powder, it is particularly preferable to use a scale-like one. In this case, as will be described later, when the unevenness forming jig 4 is slidably contacted with the outer layer coating 2 on the surface of the metal plate 1, the arrangement of the scale-like metal powder is disturbed at the slidable contact portion, and the light reflectivity is large. The portion where the light reflectivity is changed is formed in a streak shape along the concave and convex portions 13 of the concavo-convex pattern, so that the streak pattern can be visually recognized more clearly.

  The average particle size of the metal powder is preferably in the range of 5 to 100 μm, particularly preferably in the range of 10 to 30 μm. If this particle size is excessive, applicability at the time of application of the outer layer paint 2 is deteriorated, and uniform application becomes difficult particularly when applied by a roll coater. If the particle size is too small, the outer layer coating film 5 cannot be provided with a sufficient metallic feeling, and when a scaly metal powder is used, the change in light reflectivity due to the disorder of the arrangement is sufficiently exhibited. There is a case that it will not be.

  When such a metal powder is used, the blending amount in the outer layer paint 2 is preferably in the range of 0.5 to 15% by weight.

  The outer coating material 2 can be applied by using a normal coating apparatus such as dipping, spraying, brush coating, roll coater, curtain coater, air knife, electrostatic coating or the like.

  After the liquid outer layer paint 2 is applied, before the outer layer paint 2 is baked and cured, the coating film of the outer layer paint 2 is subjected to an unevenness forming process. In this unevenness forming process, an unevenness forming jig 4 having a plurality of protrusions 3 is disposed on a conveyance path on which the metal plate 1 after the outer layer paint 2 is applied, and the protrusions 3 of the unevenness forming jig 4 are disposed. Is carried out by conveying the metal plate 1 while being in sliding contact with the outer layer paint 2 on the metal plate 1.

  The unevenness forming process by the unevenness forming jig 4 can be performed at an appropriate position until the metal plate 1 is conveyed to the heating furnace 16 after the outer layer paint 2 is applied to the metal plate 1. FIG. 1 shows an installation example of the unevenness forming jig 4.

  In the illustrated example, the pickup roll 10 is disposed above the paint pan 9 storing the outer layer paint 2 so that the lower part of the pick-up roll 10 is immersed in the outer layer paint 2 in the paint pan 9, and the application roll 11 is arranged around the periphery. A long metal plate 1 is transported between the coating roll 11 and a backup roll 12 disposed to face the coating roll 11 so that the surface is in contact with the peripheral surface of the pickup roll 10. It has come to be. At this time, the pickup roll 10 is driven to rotate so that the outer layer paint 2 is supplied to the peripheral surface thereof, and the outer layer paint 2 rotates in the same direction as or opposite to the rotation direction of the backup roll 12. Further, the outer layer paint 2 is supplied to the surface of the metal plate 1 and applied. The metal plate 1 to which the outer layer coating 2 is applied is conveyed for a certain length along the peripheral surface of the backup roll 12, and is then separated from the peripheral surface and conveyed to the heating furnace 16.

  At this time, the unevenness forming jig 4 is disposed so as to be in sliding contact with the coating film of the outer coating 2 on the metal plate 1 in contact with the backup roll 12. In this way, after the outer layer paint 2 is applied to the metal plate 1, the outer layer paint 2 applied to the metal plate 1 in a state where the metal plate 1 is supported by the backup roll 12 and the arrangement position is stable. By making the concavo-convex forming jig 4 slidably contact the coating film, a stable concavo-convex forming process can be performed.

  Of course, the arrangement position of the unevenness forming jig 4 is not limited to this, and after the outer layer paint 2 is applied, the outer layer paint 2 is slid on the metal plate 1 before being cured and formed in the heating furnace 16 or the like. What is necessary is just to arrange | position so that it may contact | connect.

  As the uneven | corrugated formation jig | tool 4, what has the some protrusion 3 which slidably contacts the outer-layer coating material 2 on the metal plate 1 as shown in FIG.2, 3 can be used. When the metal plate 1 to which the outer layer paint 2 is applied is conveyed so that the outer layer paint 2 is in sliding contact with the protrusions 3, a plurality of concave stripes 13 are formed in the outer layer paint 2 at positions where the protrusions 3 are in sliding contact. At the same time, ridges 14 are formed between the ridges 13. At this time, each protrusion 3 is in a state in which its tip is immersed in the outer layer coating 2 applied in a film shape on the metal plate 1, and in this state, by conveying the metal plate 1, the outer layer coating is formed by each projection 3. 2 is divided, and the portion where each projection 3 is in sliding contact is formed as a recess 13. 2 and 3, illustration of the undercoat coating film 15 and the intermediate coating film 8 is omitted.

  As the unevenness forming jig 4, an appropriate one can be used. For example, as shown in FIG. 2, a plurality of thin wire-like protrusions 3 are arranged in a direction perpendicular to the conveying direction of the metal plate 1. Using the uneven forming jig 4, the tip of the protrusion 3 can be brought into sliding contact with the surface of the outer layer coating 2 on the metal plate 1.

  Further, as shown in FIG. 3, an unevenness forming jig 4 in which a plurality of comb-like projections 3 are arranged in a direction orthogonal to the conveying direction of the metal plate 1 is used, and the tip of the projection 3 is attached to the metal plate. You may make it slidably contact the surface of the 1-shaped outer layer coating material 2.

  Further, the material of the unevenness forming jig 4 is not particularly limited, but a material having low water absorption is preferable and can be formed of an appropriate metal material or resin molded body.

  During such uneven formation processing, the conveyance speed of the metal plate 1, the coating amount of the outer layer coating 2 applied to the metal plate 1, the properties such as the viscosity, the interval between the protrusions 3 in the unevenness forming jig 4, The processing conditions such as the immersion dimension in the outer coating 2 are appropriately set according to the uneven shape required for the outer coating 5.

  For example, the conveyance speed of the metal plate 1 can be in the range of 10 to 150 m / min. If this transport speed is excessively high, the outer coating material 2 is likely to be clogged between the protrusions 3 and may fall due to its own weight, resulting in defects such as lumps on the surface of the coating film. Further, if this transport speed is too slow, the productivity deteriorates.

  Further, the properties such as the coating amount and viscosity of the outer layer coating 2 are formed by sliding the concavo-convex forming jig 4 after the concavo-convex forming jig 4 is slidably contacted in the above-described concavo-convex forming process until baking hardening. It is preferable to adjust appropriately so that the uneven | corrugated shape to be held is maintained. Specific conditions therefor are adjusted as appropriate. For example, the outer layer paint 2 has a viscosity (Ford Cup No. 4) of 40 to 120 seconds and a thixotropic index (TI) of 0.5 to 3.5. It is preferable to use a material and make the coating amount in the range of 10 to 60 μm in terms of the wet coating thickness. Under such conditions, it is possible to form a clear streak-like uneven pattern while suppressing the occurrence of clogging of the outer layer paint 2 between the protrusions 3.

  Moreover, although the space | interval between adjacent processus | protrusions 3 is suitably adjusted according to the width | variety between the desired recessed stripes 13 in an uneven | corrugated pattern, the outer layer coating material 2 is clogged in the clearance gap between these processus | protrusions 3, and this clogging. If the outer layer coating material 2 falls due to its own weight or the like, the outer layer coating film 5 to be formed may be defective such as lumps. Therefore, it is preferable to adjust the outer layer coating film 5 so that the outer layer coating film 5 is not clogged between the protrusions 3. Such clogging of the outer layer paint 2 is caused not only by the gap between the protrusions 3 but also by the properties such as the viscosity of the outer layer paint 2, the shape of the protrusions 3, the protrusion 3 and the outer layer paint 2 on the metal plate 1. However, in order to prevent clogging, the width of the gap between the protrusions 3 should be reduced. It is preferable to set it to 2.0 mm or more.

  In addition, although the dimensions of the protrusions 3 are also adjusted as appropriate, in the case of the thin wire-like protrusions 3, for example, those having a wire diameter in the range of 0.1 to 5.0 mm can be used. In this case, for example, a metal plate 1 having a conveyance direction dimension of 0.5 to 20 mm and a metal plate 1 having a dimension perpendicular to the conveyance direction of 0.2 to 5.0 mm can be used.

  In addition, the immersion dimension of each protrusion 3 in the outer layer paint 2, that is, how much the tip of each protrusion 3 is immersed in the outer layer paint 2 when it comes into sliding contact with the outer layer paint 2, depends on the coating thickness of the outer layer paint 2 and the desired Although it adjusts suitably according to the depth of the groove 13 of this, the range of 10-60 micrometers is desirable, for example.

  Further, when arranging the unevenness forming jig 4, the plurality of protrusions 3 are arranged in a straight line in a direction orthogonal to the conveying direction of the metal plate 1, and the arrangement positions of the respective protrusions 3 are transferred to the metal plate 1. It may be shifted in the direction. In this way, a finer uneven pattern can be formed on the outer layer coating film 5 on the metal plate 1. Even when the gap between the protrusions 3 is restricted in order to prevent clogging of the outer coating material 2 between the protrusions 3, the width between the concave stripes 13 in the concavo-convex pattern is desired while preventing the occurrence of such clogging. Can be.

  For example, in the example shown in FIGS. 2 and 3, a first projection row 6 is provided in which a plurality of projections 3 are provided in a row in a direction perpendicular to the conveying direction of the metal plate 1 at intervals. The second protrusion row 6 is provided at a position shifted from the arrangement position in the conveying direction of the metal plate 1. At this time, the arrangement position of the protrusion 3 in the second protrusion row 6 (arrangement position in the direction orthogonal to the conveying direction of the metal plate 1) is a position shifted from the arrangement position of the protrusion 3 in the first protrusion row 6, The protrusions 3 in the second protrusion row 6 are arranged between the adjacent protrusions 3 in the one protrusion row 6. Thereby, the effective interval can be made narrower than the arrangement interval of the protrusions 3 in the unevenness forming jig 4. Further, by providing two or more such projection rows 6 and shifting the arrangement positions of the projections 3 in each projection row 6 in the direction perpendicular to the conveying direction of the metal plate 1, it is possible to form even finer irregularities. .

  Here, when the projections 3 are formed in a comb-like shape with a resin molded body or the like as shown in FIG. 3, the resin molded body having the comb-like projections 3 as shown in FIG. The unevenness forming jig 4 can be formed by forming a jig segment 4a made of the like and arranging the two jig segments 4a along the conveying direction of the metal plate 1.

Further, the intervals in the direction orthogonal to the conveying direction of the protrusions 3 in the unevenness forming jig 4 can be all the same, and the unevenness pattern formed on the outer layer coating film 5 can be changed by changing the intervals. For example, when the unevenness forming jig 4 is composed of two jig segments 4a, each jig segment 4a has one jig segment 4a as shown in FIGS. 4 (a) and 4 (b). All the intervals P _{1 of the} projections 3 are made the same in the projection row 6, and all the intervals P _{2 of the} projections 3 are made the same in the projection row 6 of the other jig segment 4 a as shown in FIG. 4 (a). The interval P ₁ between the protrusions 3 of one jig segment 4a is different from the interval P ₂ between the projections 3 of the other jig segment 4a shown in FIG. 4B. If it does in this way, in the uneven | corrugated formation jig | tool 4 as a whole, the space | interval of the direction orthogonal to the conveyance direction between protrusion 3 will change periodically, and as shown in FIG. It is possible to form a concavo-convex pattern rich in changes in which the interval of the fluctuates. In FIG. 5, only the position of the concave / convex pattern 13 to be formed is shown by a straight line.

  When the projections 3 are slidably contacted with the outer layer paint 2 by performing the above-described unevenness forming process, the outer layer paint 2 is scraped at the portion where the projections 3 are slid, as shown in FIG. The groove 13 is formed in the path through which the has passed. At this time, when a pigment (indicated by reference numeral 17 in FIG. 8) is contained in the outer layer paint 2, the density of the pigment 17 becomes coarse in the portion of the concave stripe 13, and the distribution of the pigment 17 is unevenly distributed. Arise. In particular, when the scale paint 17 is contained in the outer coating material 2, the arrangement of the particles of the pigment 17 in the path through which the protrusions 3 pass is disturbed. Thereby, the fine uneven | corrugated pattern whose space | interval between the adjacent groove 13 is 0.1-3.0 mm and the depth of the groove 13 is 5-25 micrometers can be formed, for example. Of course, it is also possible to form a concavo-convex pattern in which the width between the concave stripes 13 is formed to be 3.0 mm or more and the interval between the concave stripes 13 is wide.

  In this way, the outer layer paint 2 is baked and cured by continuously passing the metal plate 1 having the plurality of recesses 13 and the protrusions 14 formed in the outer layer paint 2 through a heating furnace 16 or the like. The outer layer coating film 5 having the concave stripes 13 and the convex stripes 14 is formed (see FIGS. 6A and 6C). The bake and curing conditions of the outer coating material 2 by the heating furnace 16 and the like are appropriately set according to the composition, the coating amount, etc. of the outer coating material 2, and can be set to, for example, 200 to 250 ° C. for 0.5 to 1 minute.

  Thus, when forming the outer coating film 5 which has an uneven | corrugated pattern, an uneven | corrugated pattern can also be formed only in a specific area | region besides forming an uneven | corrugated pattern in the whole outer layer coating film 5. FIG.

  For example, in the concavo-convex forming process using the concavo-convex forming jig 4 as described above, the concavo-convex forming jig 4 is provided only in one or a plurality of specific regions between one end edge and the other end edge in the direction orthogonal to the conveying direction of the metal plate 1. As a result of sliding contact with the outer layer coating material 2 on the metal plate 1, it is possible to form an uneven pattern only in this specific region.

  Moreover, by making the unevenness forming jig 4 approach and separate from the metal plate 1, the projection 3 is appropriately switched between a state in which the protrusion 3 is in sliding contact with the outer layer paint 2 on the metal plate 1 and a state in which the protrusion 3 is separated from the outer layer paint 2, The area | region where the uneven | corrugated pattern was formed along the conveyance direction of the metal plate 1 can be formed intermittently.

  Further, when the unevenness forming jig 4 is moved in a direction perpendicular to the conveying direction of the metal plate 1 in a state where the protrusion 3 is in sliding contact with the outer layer paint 2 on the metal plate 1, the uneven pattern 13 and the protruding line The direction of 14 can be formed in a direction different from the conveying direction of the metal plate 1. At this time, by making the movement speed of the concavo-convex forming jig 4 constant, a concavo-convex pattern in a direction inclined with respect to the conveying direction of the metal plate 1 is formed, and the moving speed of the concavo-convex forming jig 4 is slowed down. By forming the concave stripes 13 and the convex stripes 14 in a curved shape and changing the moving direction of the concave / convex forming jig 4, the direction of the concave stripes 13 and the convex stripes 14 can be bent, and the irregularities rich in change A pattern can be formed.

  Moreover, when the uneven | corrugated formation jig | tool 4 is comprised by the 2 or more several jig | tool division | segmentation 4a, if each jig | tool division | segmentation 4a is moved to the direction orthogonal to the conveyance direction of the metal plate 1 separately, Moreover, the complicated uneven | corrugated pattern which the some protruding item | line 14 and the recessed item | line 13 cross | intersect can also be formed.

  Further, in a state where the protrusion 3 is in sliding contact with the outer layer paint 2 on the metal plate 1, the unevenness forming jig 4 is rotated around an axis in a direction perpendicular to the surface of the outer layer paint 2 on the metal plate 1 (for example, neck It may be made to swing and rotate). In this way, it is possible to form a concavo-convex pattern in which the interval between adjacent concave stripes 13 changes along the conveying direction of the metal plate 1, thereby forming a concavo-convex pattern rich in change. it can.

  Further, by using a roll-shaped unevenness forming jig 4 in which a plurality of protrusions 3 are provided to protrude over the entire outer peripheral surface, the unevenness forming jig 4 is reversely rotated with respect to the conveying direction of the metal plate 1. If the protrusions 3 on the peripheral surface are sequentially brought into sliding contact with the outer layer paint 2, it is possible to form a concavo-convex pattern having a plurality of concave ridges 13 having a short length. It is formed into a unique shape with a shallower depth at both ends in the direction. Moreover, if the said uneven | corrugated formation jig | tool 4 is rotated forward with respect to the conveyance direction of the metal plate 1, an uneven | corrugated pattern which is very short in length or has many dot-like several ridges 13 (concave part) will be formed. You can also.

  Thus, the coated metal plate obtained by forming the outer layer coating film 5 can be wound in a coil shape or cut into a predetermined length as described above.

  Moreover, after forming the outer layer coating film 5 on the metal plate 1 and before winding or cutting the metal plate 1 as described above, the outer layer coating film is further conveyed as necessary while continuously conveying the metal plate 1. 5 may be formed (see FIGS. 6B and 6D). In this way, even if a portion with a thin coating film thickness is formed by forming an uneven pattern on the outer coating film 5, the clear coating film 7 forms a sufficiently thick entire coating film on the coated metal plate. Thus, the coating film performance such as chemical resistance and weather resistance can be improved. Moreover, even if the clear coating film 7 is formed in this way and the coating film surface is formed smoothly, the uneven pattern of the outer coating material 2 can be visually recognized through the clear coating film 7 and can exhibit excellent design properties. it can.

  As the clear paint for forming the clear coating film 7, an appropriate one such as a polyester-based thermosetting transparent paint or a fluorine-based thermoplastic transparent paint can be used. The clear coating can be applied by an appropriate coating apparatus including dipping, spraying, brushing, roll coater, air knife, electrostatic coating and the like. And after application | coating of a clear coating material, the metal plate 1 can be baked and hardened by making a metal plate 1 pass continuously to a heating furnace etc., and the clear coating film 7 can be formed.

  The coating amount of the clear coating film 7 is adjusted as appropriate, but according to the depth of the concavo-convex pattern formed on the outer layer coating film 5, the surface of the clear coating film 7 is smoothed by filling the concavo-convex pattern. It is preferable to apply. Specifically, it can apply | coat so that the thickness of the clear coating film 7 may become the range of 5-25 micrometers, for example.

  Moreover, when forming the uneven | corrugated outer-layer coating film 5 as mentioned above, the concave strip 13 of the outer-layer coating film 5 formed in the position which the uneven | corrugated formation jig | tool 4 slidably contacted is formed in the example shown in FIG. The undercoat film 15 or the intermediate coat film 8 that is the base of the outer layer coating film 5 is concealed at the position where the outer layer coating film 5 is present, but the base of the outer layer coating film 5 is exposed at the bottom surface of the recess 13 as shown in FIG. You may do it. In this case, when the concavo-convex forming jig 4 is slidably contacted with the outer layer coating 2, the protrusions of the concavo-convex forming jig 4 are brought into slidable contact with the undercoat coating film 15 or the intermediate coating film 8 as a base. By preventing the outer layer paint 2 from remaining at the position, and forming the outer layer paint 2, the outer layer coating film 5 in which the base is exposed on the bottom surface of the recess 13 can be formed.

  If it does in this way, by making the base color of the outer layer coating film 5 appear on the bottom surface of the concave strip 13, it is possible to impart even higher design properties. For example, when the outer coating film 5 is formed after the intermediate coating film 8 is formed, the color and hue of the outer coating film 3 as the intermediate coating film 8 are the same or similar, and at least one of brightness and saturation is different. If there are those having the above, a streak pattern having the same color tone as a whole can appear. Further, when an intermediate coating film 8 having a hue different from the color of the outer coating film 5 is formed, a streak-like pattern in which the color of the hue different from that of the outer coating film 3 appears in a streak form at the position where the recess 13 is formed. It can be made to.

  As described above, when the coated metal plate provided with the outer layer coating film 5 having the concavo-convex pattern is produced, only by arranging the concavo-convex forming jig 4 without greatly changing the continuous production process of the coated metal plate, A coated metal plate having a streak-like concavo-convex pattern having a high design appearance can be produced with high production efficiency without requiring operator skill.

  Hereinafter, the present invention will be described in detail by way of examples.

Example 1
As the metal plate 1, a long Galvalume steel plate (registered trademark) is used, and this is continuously conveyed at a plate speed of 100 m / min in the longitudinal direction, while pre-coating treatment, application of undercoat paint and baking hardening, A coated metal plate was obtained by sequentially applying coating paint and baking and curing, coating the outer layer coating 2, applying unevenness, and baking and curing the outer layer coating 2.

  At this time, a product number “ZM-1300AN” manufactured by Nippon Parkerizing Co., Ltd. was used as a treatment agent in the pretreatment for coating.

In addition, as an undercoat paint, a product number “P667” manufactured by Nippon Fine Coatings Co., Ltd., which is an epoxy paint, is used, the coating amount is 5 g / m ² (dry film thickness 3 μm), and the baking and curing conditions are a heating temperature of 200 ° C. The heating time was 20 seconds.

  In addition, as the intermediate coating material, a product number “NSC360HQ” manufactured by Nippon Fine Coatings Co., Ltd., which is a silver-based polyester-based coating material, is used so that the dry film thickness is 13 μm. The heating time was 30 seconds.

  In addition, as the outer layer paint 2, a product number “NSC360HQ” manufactured by Nippon Fine Coatings Co., Ltd., which is a silver-based polyester-based paint, is applied to a solid content excluding volatile components from a scaly aluminum powder having an average particle diameter of 20 μm. Using a coating facility shown in FIG. 1 using a 11.2 wt% content, viscosity (Ford Cup No. 4) 70 seconds, TI value 1.3), the coating amount is 30 μm in wet film thickness and 13 μm in dry film thickness. It was made to become.

  Further, the unevenness forming process is performed by a comb-like unevenness forming jig 4 comprising two rows of protrusions 6 having the shape shown in FIG. 4 (the width dimension of the protrusions 3 is 1.0 mm, and the interval between the protrusions 3 is the first row. The projection line 6 is 3.0 mm and the second projection line 6 is 5.0 mm), and this is located at the position shown in FIG. 2 and was arranged so that the immersion depth in the outer coating 2 was 30 μm.

  Moreover, the baking hardening conditions of the outer layer coating material 2 were a heating temperature of 210 ° C. and a heating time of 30 seconds.

(Example 2)
An outer layer coating film 5 having a concavo-convex pattern was formed in the same manner as in Example 1 except that the intermediate coating was not applied, and then a clear coating was formed by laminating on the outer layer coating 5. As the clear paint, a polyester paint No. “NSC300HQ” was used, the coating amount was 12 g / m ² (dry film thickness 10 μm), and the baking and curing conditions were a heating temperature of 220 ° C. and a heating time of 30 seconds.

(Example 3)
As the concavo-convex forming jig 4, a projection having a width dimension of 2.0 mm was used. Otherwise, a coated metal plate was obtained in the same manner as in Example 1.

Example 4
As the concavo-convex forming jig 4, a projection having a width dimension of 0.1 mm was used. Otherwise, a coated metal plate was obtained in the same manner as in Example 1.

(Example 5)
As the metal plate 1, a long Galvalume steel plate (registered trademark) is used, and this is continuously conveyed at a plate speed of 60 m / min in the longitudinal direction, while pre-coating treatment, application of undercoat paint and baking hardening, A coated metal plate was obtained by sequentially applying coating paint and baking and curing, coating the outer layer coating 2, applying unevenness, and baking and curing the outer layer coating 2.

  At this time, a product number “ZM-1300AN” manufactured by Nippon Parkerizing Co., Ltd. was used as a treatment agent in the pretreatment for coating.

In addition, as the undercoat paint, the product number “GL64P”, which is an epoxy paint manufactured by Nippon Fine Coatings Co., Ltd., is used. The coating amount is 7 g / m ² (dry film thickness 5 μm). The heating time was 30 seconds.

  In addition, as the intermediate coating, the product name “Dick Flow” manufactured by Nippon Fine Coatings Co., Ltd., which is a silver-tone fluororesin coating, is used so that the dry film thickness is 20 μm. The heating temperature was 250 ° C. and the heating time was 50 seconds.

  In addition, as the outer layer paint 2, a trade name “Dick Flow” (a fine aluminum resin having an average particle diameter of 20 μm, a solid content excluding volatile components) manufactured by Nippon Fine Coatings Co., Ltd., which is a silver-tone fluororesin paint. 1% by weight, viscosity (Ford Cup No. 4) 90 seconds, TI value 2.6), and with a coating facility shown in FIG. The thickness was set to 20 μm.

  Further, the unevenness forming process is performed by a comb-like unevenness forming jig 4 comprising two rows of protrusions 6 having the shape shown in FIG. 4 (the width dimension of the protrusions 3 is 1.0 mm, and the interval between the protrusions 3 is the first row. The projection line 6 is 3.0 mm and the second projection line 6 is 5.0 mm), and this is located at the position shown in FIG. 2 and was arranged so that the immersion depth in the outer coating 2 was 50 μm.

  Moreover, the baking hardening conditions of the outer layer coating material 2 were a heating temperature of 250 ° C. and a heating time of 50 seconds.

(Comparative Example 1)
A coated metal plate was obtained in the same manner as in Example 1 except that the unevenness forming treatment was not performed.

(Comparative Example 2)
As the metal plate 1, a long Galvalume steel plate (registered trademark) is used, and this is continuously conveyed at a plate speed of 80 m / min in the longitudinal direction, while pre-coating treatment, application of undercoat paint and baking hardening, A coated metal plate was obtained by sequentially applying coating paint and baking and curing, forming a printing layer, applying clear paint and baking and curing.

  At this time, a product number “ZM-1300AN” manufactured by Nippon Parkerizing Co., Ltd. was used as a treatment agent in the pretreatment for coating.

In addition, as an undercoat paint, a product number “P667”, which is an epoxy paint manufactured by Nihon Parkerizing Co., Ltd., is used. The coating amount is 5 g / m ² (dry film thickness 3 μm). The time was 20 seconds.

  In addition, as the intermediate coating material, a product number “NSC360HQ” manufactured by Nippon Fine Coatings Co., Ltd., which is a silver-based polyester-based coating material, is used so that the dry film thickness is 13 μm. The heating time was 30 seconds.

  In forming the printing layer, a printing ink (manufactured by Dainippon Ink and Chemicals, product number “Geotech AN”) is used, and a printing layer having a streak-like printed pattern is formed by a gravure offset printing method. It was baked and cured for 30 seconds.

Further, as the clear paint, a product number “NSC300HQ” which is a polyester paint was used, the application amount was 12 g / m ² (dry film thickness 10 μm), and the baking and curing conditions were a heating temperature of 220 ° C. and a heating time of 30 seconds.

(Appearance evaluation)
The appearance of the coated metal plate obtained in each example and comparative example was visually observed and evaluated according to the following evaluation criteria.
A: A clear streak-like design is recognized.
○: A slightly unclear streak pattern is observed.
(Triangle | delta): Although a stripe pattern is recognized, external appearance defects, such as a crater shape and a swelling shape, are also recognized.
X: A stripe pattern is not recognized.

  Moreover, the external appearance photograph about Example 1 is shown in FIG.

(Uneven depth evaluation)
The uneven depth of the surface of the coated metal plate obtained in each of the examples and comparative examples was measured using a surface roughness shape measuring machine (product number “Handy Surf E-35A”) manufactured by Tokyo Seimitsu Co., Ltd.

(Workability evaluation)
In each of the examples and comparative examples, workability when obtaining a coated metal plate was evaluated according to the following evaluation criteria.
◎: Can be produced under the conventional production line and through plate conditions ○: Although there is a restriction on the speed of the line, etc., it can be produced on the existing production line △: Additional printing equipment is required ×: Crater shape, raised shape, etc. Table 1 shows the above results.

It is a partial schematic diagram showing an example of an embodiment of the present invention. It is a one part perspective view same as the above. It is a one part perspective view of the other example same as the above. (A) And (b) is a front view which shows an example of a structure of an unevenness | corrugation formation jig | tool. It is a top view which shows a mode that an uneven | corrugated pattern is formed using the uneven | corrugated formation jig | tool shown in FIG. (A) thru | or (d) are sectional drawings which show the structure of a coating metal plate. (A) thru | or (d) is sectional drawing which shows the other example of a structure of a coating metal plate. (A) thru | or (c) is sectional drawing which shows the mode of an unevenness | corrugation formation process typically. 1 is an appearance photograph of a coated steel plate obtained in Example 1.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Metal plate 2 Outer layer coating 3 Protrusion 4 Concavity and convexity forming jig 5 Outer layer coating 6 Projection row 7 Clear coating 8 Intermediate coating

Claims (11)

  A method for producing a coated metal plate in which the surface of the metal plate is coated while continuously conveying the metal plate, wherein a liquid outer layer coating is applied to the surface of the metal plate on the conveyance path of the metal plate. Then, an outer layer coating film having a streak-like uneven pattern is formed by sliding an unevenness forming jig having a plurality of protrusions on the uncured outer layer paint on the metal plate, and then curing the outer layer paint. The manufacturing method of the coating metal plate characterized by including the process of forming.   2. The method of manufacturing a coated metal plate according to claim 1, wherein the plurality of protrusions are arranged at different arrangement positions in the conveying direction of the metal plate.   3. The coated metal according to claim 2, wherein, in the unevenness forming jig, a plurality of rows of projections including a plurality of projections arranged in a row are provided with different arrangement positions in the transport direction of the metal plate. A manufacturing method of a board.   4. The method for producing a coated metal plate according to claim 3, wherein an interval between adjacent protrusions in each protrusion row is varied for each protrusion row.   The method for producing a coated metal plate according to any one of claims 1 to 4, wherein the outer layer paint contains a colorant.   6. The method for producing a coated metal plate according to claim 5, wherein the colorant contains at least a metal powder.   The method for producing a coated metal plate according to claim 6, wherein the metal powder is scaly.   The method for producing a coated metal sheet according to any one of claims 1 to 7, wherein after forming the outer coating film, a clear coating film is formed on the surface of the outer coating film.   The method for producing a coated metal plate according to any one of claims 1 to 8, wherein an intermediate coating film is formed on the surface of the metal plate before forming the outer coating film.   The coated metal plate according to any one of claims 1 to 9, wherein the base of the outer layer coating film is exposed on the bottom surface of the recess of the outer layer coating film formed at a position where the unevenness forming jig is in sliding contact. Manufacturing method.   A coated metal plate produced by the method according to claim 1.