JP2007175664A - Apparatus for coating building board - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an apparatus for coating a building board which is capable of forming a desired color and pattern without making the design unclear and capable of preventing the breakage of an ink nozzle or deterioration of continuous productivity. <P>SOLUTION: The apparatus for coating the building board includes a transporting means 2 for transporting the building board in one direction and a coating head 5 formed so as to provide an ink nozzle 4 for jetting an ink 3. The building board is coated by an inkjet system with a coating head 5 while being transported by the transporting means 2. A correcting means 6 for correcting the warpage or the torsion of the building board 1 is provided and the building board in which the warpage or the torsion is corrected by the correcting means 6 is coated by the inkjet while being transported by the transporting means 2. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a building board coating apparatus for coating a building board such as an outer wall material by an ink jet method.

  Conventionally, in order to enhance the beauty of the building board 1 such as an outer wall material, printing on the surface of the building board 1 in full color has been performed (for example, see Patent Document 1). In performing such printing, as shown in FIG. 6, it is formed by providing a conveying means 2 for conveying the building board 1 in one direction (direction of arrow A) and an ink nozzle 4 for ejecting ink 3. A coating apparatus including a coating head 5 is used, and the building board 1 is transported by the transporting means 2 while being painted by the coating head 5 by an ink jet method. Thus, in the conventional coating apparatus, since it coats, conveying the building board 1, the production efficiency of the building board 1 printed in full color can be improved.

However, the building board 1 may be deformed by warping or twisting due to a drying process or the like performed on the building board 1 before passing under the coating head 5. There is a problem that the interval between the building boards 1 is changed and the ink 3 is not ejected to a predetermined position, and a desired pattern or pattern is not formed, resulting in an unclear design. In addition, the building board 1 collides with the ink nozzles 4 due to warping or twisting of the building board 1 and damages the ink nozzles 4 or cannot be inkjet-coated while being continuously conveyed to a large number of building boards 1; Continuous productivity may be reduced.
JP 2005-74666 A

  The present invention has been made in view of the above points, and a desired pattern or pattern can be formed so that the design does not become unclear. Ink nozzles are damaged or continuous productivity is reduced. It is an object of the present invention to provide a building board coating apparatus that can prevent such a situation.

  The building board coating apparatus according to the present invention comprises a conveying means 2 for conveying the building board 1 in one direction, and a coating head 5 formed by providing an ink nozzle 4 for ejecting ink 3, the conveying means. In the building board 1 coating apparatus in which the building board 1 is transported by the coating head 5 while being transported by the coating head 5, a correction means 6 for correcting warpage and twisting of the building board 1 is provided. It is characterized by.

  In the present invention, the perforated belt 11 having a large number of through holes 11a is provided to form the conveying means 2, and the building board 1 placed on the perforated belt 11 has a suction action through the through holes 11a. The vacuum / decompression box 22a can be provided as the correcting means 6 below the perforated belt 11.

  In the present invention, as the correction means 6, the carrier plate 8 provided with the suction port 7 opened on the upper surface and the carrier plate 8 transported by the transport means 2 are connected to the carrier plate 8 through the suction port 7. A decompression cylinder 9 for exerting a suction action on the building board 1 can be provided.

  According to the present invention, the building board 1 in which the warping or twisting is corrected by the correcting means 6 can be applied by ink jet while being conveyed by the conveying means 2, and the ink nozzle caused by the warping or twisting of the building board 1 is possible. 4 and the change of the space | interval of the building board 1 can be prevented. Therefore, the ink 3 can be ejected to a predetermined position of the building board 1, a desired pattern or pattern can be formed, and the design can be prevented from becoming unclear. It is possible to prevent the plate 1 from colliding with the ink nozzles 4 to prevent the ink nozzles 4 from being damaged or the continuous productivity from being lowered.

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

  As shown in FIGS. 1 and 2, the coating apparatus for the building board 1 according to this embodiment includes a conveying means 2 that conveys the building board 1 in one direction, and a coating surface of the building board 1 that is disposed above the conveying means 2. The coating head 5 for jetting ink to the upper surface is a coating means, and the coating surface extends over the entire length in the width direction of the building board 1 (direction orthogonal to the conveying direction A of the building board 1). It is to be painted by an inkjet method. For example, a line head can be used as the coating head 5.

  Examples of the building board 1 include ceramic-based inorganic boards obtained by papermaking, extruding or casting a raw material slurry containing a cement component as a solid content, molding, pre-curing, and autoclave curing. At this time, the composition of the raw slurry, the conditions of papermaking, extrusion or casting, molding conditions, pre-curing, autoclave curing, etc. are not particularly limited, so long as the compositions and conditions normally used in the production of inorganic plates are applied. Good. Further, a receiving layer (receiving layer) can be formed on the painted surface (upper surface) of the building board 1 so that the ink jet ink can be easily fixed. Furthermore, you may provide a groove | channel etc. in the surface of the building board 1, and may form in an unevenness | corrugation.

  The conveying means 2 is formed by hanging a perforated belt 11 around a pair of rotating shafts 40 in an endless loop shape. The perforated belt 11 is formed with a large number of through holes 11a penetrating in the thickness direction over the entire surface. By using such a perforated belt 11, a suction action by the correcting means 6 as described later can be exerted on the building board 1 placed on the perforated belt 11. Further, it is preferable that the through holes 11a be provided closer to the end portion than the center portion in the width direction (direction orthogonal to the traveling direction) of the perforated belt 11. Warping and twisting of the building board 1 often occurs at the peripheral edge of the building board 1, and if the through holes 11a are densely provided at the end of the perforated belt 11 in the width direction, the warping and twisting of the building board 1 is caused It becomes easy to correct. The end portion of the perforated belt 11 refers to a portion 3 to 15 mm wide from the end surface of the perforated belt 11.

  In the present embodiment, a painting apparatus capable of full color painting is illustrated, and the painting means includes four painting heads 5 that respectively eject yellow, cyan, magenta, and black inks ( In FIGS. 1 and 2, yellow, cyan, magenta, and black in this order from the left end). Each coating head 5 includes a nozzle array (not shown) having a number of nozzles, and is connected to an ink tank (not shown) that supplies ink of each color to the nozzle array. The nozzle array ejects ink droplets from each nozzle using a piezo element (not shown). Further, nozzle control means (not shown) for controlling ink ejection is connected to the nozzle array, and the nozzle control means is supplied from a paint control means (not shown) having paint design data. Ink is ejected in response to a nozzle control signal. In addition to the above-described piezo control method, a nozzle array that performs ink ejection or stops ejection by a method of irradiating and controlling laser light to the photothermal exchange element may be used.

  The correcting means 6 is formed by a vacuum / decompression pump (not shown) and a plurality of vacuum / decompression boxes 22 a connected to the pump, and is arranged below the conveying means 2. That is, the vacuum / decompression box 22a is provided in the vicinity of the lower surface of the portion located above the rotating shaft 40 of the perforated belt 11 of the conveying means 2, and thereby the perforated belt 11 through the through hole 11a. The building board 1 placed and transported on the perforated belt 11 can be sucked to the perforated belt 11 side.

  Moreover, the blowing device 21 is provided in the coating apparatus of the present invention. The blower means 21 is formed by a blower duct 21 a connected to a generation source (not shown) of the antistatic airflow 20, and this blower duct 21 a is arranged above the coating head 5. A plurality of slit-shaped air outlets 21b are formed on the lower surface of the air duct 21a, and the antistatic airflow 20 is forcibly ejected downward from the air outlet 21b. The air duct 21a is disposed so as to cover all the coating heads 5, 5... Arranged in the same direction as the transport direction A of the building board 1, and the plurality of air outlets 21b are transported in the transport direction of the building board 1. A are arranged side by side in the same direction as A. The antistatic airflow 20 blown out from the air outlet 21b may be a positive / negative ion airflow (air containing various positive and negative ions) used for general antistatic. For example, in the case where the distance from the static eliminator is 300 mm, an ion air current is used in which the time for static elimination from +2000 V to +20 V is about 1-2 seconds. A commercially available ionizer or the like can be used as a generation source of such an antistatic airflow 20.

  Below, operation | movement of the coating device mentioned above is demonstrated.

  First, the building board 1 is placed on the perforated belt 11 with the painted surface, which is one surface in the thickness direction, facing upward. Thereafter, the building board 1 is conveyed in the direction of the arrow A by the advance of the perforated belt 11 and passed through the lower side of the coating head 5, so that the ink nozzle 4 of the painting head 5 is directed toward the lower building board 1. The building board 1 is painted by the ink jet method with the ejected ink. Further, the antistatic airflow 20 can be constantly blown out from the air blowing port 21b while the above coating is being performed.

  In the present invention, while the building board 1 is being conveyed by the conveying means 2, the warping and twisting of the building board 1 is corrected by the correcting means 6. That is, the building board 1 is transported by being placed on the perforated belt 11 of the transport means 2, while the building board 1 is sucked by the vacuum / decompression pump of the correction means 6 while being placed on the perforated belt 11. The action extends through the vacuum / decompression box 22a and the through hole 11a, and the building board 1 is attracted to the perforated belt 11 by this suction action, and is corrected to a flat state without warping or twisting. Accordingly, the building board 1 passes under the coating head 5 while maintaining a flat state. As a result, the interval between the ink nozzle 4 and the building board 1 is local or multiple sheets of one building board 1. It can be made not to change with each of the building boards 1, 1,. Accordingly, it is possible to form a desired pattern or pattern by ink-jet coating so that the design does not become unclear, and the building board 1 does not collide with the ink nozzle 4 and the ink nozzle 4 is damaged. It is possible to prevent the continuous productivity from being lowered. Furthermore, it is possible to prevent the building board 1 from being displaced due to vibration or the like during conveyance by the suction action of the correction means 6. Further, by the suction action by the correction means 6, an exhaust action can be exerted on the upper space of the perforated belt 11 from the through hole 11 a not covered with the building board 1, and from the upper side to the lower side of the building board 1. A constant air flow can be generated, and thereby, the ink 3 ejected from the ink nozzle 4 is less affected by the turbulence of the air generated when the building board 1 is conveyed, and is stable. Thus, a clear pattern can be painted (printed).

  In addition, although the magnitude | size of the suction action in this invention can be suitably set according to the thickness of the building board 1, the grade of curvature, etc., it can be set as 0.5-10 kPa, for example.

  FIG. 3 shows another embodiment. In the coating apparatus of this embodiment, a belt conveyor similar to the above is used as the conveying means 2, but a normal one having no through holes is used as the belt 2a. The correcting means 6 includes a vacuum / decompression pump (not shown), a carrier plate 8 and a decompression cylinder 9 instead of the vacuum / decompression pump and the vacuum / decompression box 22a. Except for these differences, the embodiment is the same as the embodiment shown in FIGS.

  As shown in FIG. 4, the carrier plate 8 is a hollow plate-like body formed inside as a suction space 10, and a plurality of suction ports 7 communicating with the suction space 10 are provided on the upper surface of the carrier plate 8. ing. A plurality of reinforcing ribs 12 are provided in the suction space 10 to support the carrier plate 8 in the thickness direction (vertical direction). Further, a connecting pipe 13 is projected from one side surface of the carrier plate 8, and the inside thereof communicates with the suction space 10. As shown in FIG. 3, the connecting pipe 13 is formed over substantially the entire length of the carrier plate 8 in the front-rear direction (direction parallel to the conveying direction), and the connecting pipe 13 is formed in a rectangular tube shape (a rectangular column shape). (Cylinder shape).

  The decompression cylinder 9 is disposed just on the side of the conveying means 2 and slightly above the belt 2a (the decompression cylinder 9 is not shown in FIG. 3). The decompression cylinder 9 is a cylinder that is long in parallel with the conveying direction of the building board 1 by the conveying means 2, and one end thereof is closed and the other end is connected to a vacuum / decompression pump. The decompression cylinder 9 has substantially the same length as the entire length of the conveying means 2. As shown in FIG. 4A, the decompression cylinder 9 is formed with an insertion port 15 which opens toward the upper surface of the belt 2a over the entire length. In addition, a pair of closing materials 16 are attached to the insertion port 15 so as to close the entire length thereof. The closing member 16 is formed of an elastic body such as rubber and has a fin-like shape. One closing member 16 is provided so as to hang from the upper edge of the insertion port 15 and the other closing member 16 is inserted. It is provided so as to rise from the lower end edge of the mouth 15. Further, the lower end of the upper closing member 16 and the upper end of the lower closing member 16 are in contact with each other while being slightly deformed elastically without a gap. Then, as shown in FIG. 4B, the connecting tube 13 of the carrier plate 8 is inserted into the insertion port 15 through the space between the lower end of the upper closing member 16 and the upper end of the lower closing member 16, thereby reducing the pressure reducing cylinder. The carrier plate 8 can be connected to 9. At this time, because the lower end of the upper closing member 16 and the upper end of the lower closing member 16 are in contact with the peripheral surface of the connecting pipe 13 inserted into the insertion port 15 while being slightly deformed elastically. A large gap is not formed between the blocking materials 16 and 16 and the connecting pipe 13. Further, while maintaining the state in which the lower end of the upper closing member 16 and the upper end of the lower closing member 16 are in contact with the peripheral surface of the connecting pipe 13 inserted into the insertion port 15 while being slightly deformed elastically The tube 13 is movable along the insertion port 15, and thus the carrier plate 8 is formed so as to be movable along the decompression cylinder 9 while maintaining a state of being connected to the decompression cylinder 9.

  4 (a) and 4 (b) describe the case where the connecting pipe 13 is formed in a rectangular tube shape, but the present invention is not limited to this, and for example, as shown in FIGS. 5 (a) and 5 (b), the connecting pipe 13 13 can be formed in a cylindrical shape. In this case, the plurality of connecting pipes 13 can be provided side by side in the front-rear direction of the carrier plate 8.

  And in the coating apparatus of this embodiment, the inkjet board is painted on the building board 1 as follows. First, the carrier plate 8 is set on the conveying means 2 by placing the carrier plate 8 on the belt 2a and connecting the connecting pipe 13 of the carrier plate 8 to the decompression cylinder 9 as described above. Next, the building board 1 is placed on the carrier plate 8 set in the conveying means 2 with the painted surface, which is one surface in the thickness direction, facing upward. Next, by operating the vacuum / decompression pump of the correcting means 6, the suction action by the vacuum / decompression pump is exerted on the building board 1 through the decompression cylinder 9 and the suction space 10 and the suction port 7 of the carrier plate 8, and this suction action. Thus, the building board 1 is attracted to the upper surface of the carrier plate 8 to correct the flat state without warping or twisting. Thereafter, the building board 1 is conveyed together with the carrier plate 8 in the direction of the arrow A by the advance of the belt 2a, and is passed through the lower side of the coating head 5 so that the ink nozzle 4 of the painting head 5 moves to the building board 1 below. The building board 1 is painted by an ink jet method with ink ejected in the direction.

  Here, as described above, the decompression cylinder 9 has substantially the same length as the entire length of the conveying means 2, and the carrier plate 8 is belted along the decompression cylinder 9 while maintaining the state of being connected to the decompression cylinder 9. It moves by 2a. Accordingly, while the building board 1 is being conveyed by the conveying means 2, the correction means 6 can correct the warping or twisting of the building board 1, and the building board 1 is kept under the coating head 5 while maintaining a flat state. The distance between the ink nozzle 4 and the building board 1 can be prevented from changing locally on each building board 1 or on each of the plurality of building boards 1, 1,... . Therefore, a desired pattern or pattern can be formed by inkjet coating, and the design can be prevented from becoming unclear, and the building board 1 does not collide with the ink nozzle 4 and the ink nozzle 4 is damaged. It is possible to prevent the continuous productivity from being lowered. Furthermore, it is possible to prevent the building board 1 from being displaced due to vibration or the like during conveyance by the suction action of the correction means 6.

BRIEF DESCRIPTION OF THE DRAWINGS It is a schematic perspective view which showed an example of embodiment of this invention and partly fractured | ruptured. It is a schematic side view same as the above. It is a schematic side view which shows an example of other embodiment same as the above. (A) is general | schematic sectional drawing same as the above, (b) is sectional drawing to which a part of (a) was expanded. (A) and (b) are the general | schematic sectional drawings of a part of the same as the above. It is a schematic sectional drawing which shows a prior art example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Building board 2 Conveyance means 3 Ink 4 Ink nozzle 5 Coating head 6 Correction means 11 Perforated belt 11a Through-hole 22a Vacuum / decompression box

Claims (3)

  It comprises a conveying means for conveying the building board in one direction and a coating head formed by providing an ink nozzle for ejecting ink. The conveying means is used to coat the building board by the inkjet head while conveying the building board. The building board coating apparatus according to claim 1, further comprising a correcting means for correcting warpage and twisting of the building board.   A perforated belt having a plurality of through holes is provided to form a conveying means, and a vacuum / decompression box for exerting a suction action on the building board placed on the perforated belt through the through holes is provided below the perforated belt. The building board coating apparatus according to claim 1, wherein the building board coating apparatus is provided as a correction means. As correction means, a carrier plate provided with a suction port opened on the upper surface, and a decompression cylinder connected to the carrier plate transported by the transport means and exerting a suction action on the building board on the carrier plate through the suction port are provided. The building board coating apparatus according to claim 1, wherein

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