JP5646240B2 - Anilox roll and coating device - Google Patents

Description

  BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coating apparatus capable of changing an ink supply amount at a desired location on a roll surface, for example, an anilox roll used for flexographic printing, a manufacturing method thereof, a coating apparatus including the anilox roll, and a coating method. .

  Conventional coating devices, for example, flexographic printing methods, have recently printed thin films such as alignment films and color filters on glass substrates, in addition to printing on the surface of ordinary printed materials such as plastic films, paper, and cardboard. This method is known as a forming method (in the following description, ink application, that is, ink printing will be mainly described as an example in order to avoid complexity). FIG. 5 and FIG. 6 show schematic explanatory views of a coating method, for example, a flexographic printing method. FIG. 5 shows a unit type coating method, for example, a flexographic printing method. In FIG. 5, 50 is a unit type coating apparatus, for example, a flexographic printing apparatus, and 51 is an impression cylinder. A plate cylinder 52 is provided to face the impression cylinder 51. An anilox roll 54 is provided to face the peripheral surface of the plate cylinder 52 at a position different from the impression cylinder 51. An ink supply means 56 is provided so as to be positioned on the peripheral surface of the anilox roll 54, and supplies a predetermined amount of ink to the peripheral surface of the anilox roll 54 during a printing operation. F is a substrate such as a film or a substrate.

  The effect | action is demonstrated by the said structure. The ink supplied from the ink supply means 56 is supplied to the plate cylinder 52 via the anilox roll 54. The printing material F is passed between the impression cylinder 51 provided opposite to the plate cylinder 52, and the printing cylinder 52 is pressed against the impression cylinder 51 with a predetermined pressure. Is applied, that is, printing is performed.

  FIG. 6 shows a center drum type coating method, for example, a flexographic printing method. In FIG. 6, 60 is a center drum type coating apparatus, for example, a flexographic printing apparatus, and 61 is a common impression cylinder. Reference numerals 62 a, 62 b, 62 c, and 62 d denote plate cylinders, and each plate cylinder is provided to face the common impression cylinder 61. Reference numerals 64a, 64b, 64c, and 64d are anilox rolls, which are provided to face the peripheral surfaces of the plate cylinders 62a, 62b, 62c, and 62d at positions different from the common impression cylinder 61. 66a, 66b, 66c, 66d are ink supply means installed so as to be positioned on the peripheral surfaces of the anilox rolls 64a, 64b, 64c, 64d, and the peripheral surfaces of the anilox rolls 64a, 64b, 64c, 64d during printing work. Is supplied with a predetermined amount of ink. F is a substrate such as a film or a substrate. Reference numerals 68 and 68 denote guide rolls for guiding a printed material such as a film or a coated body.

  The effect | action is demonstrated by the said structure. The ink supplied from the ink supply means 66a, 66b, 66c, 66d is supplied to the plate cylinders 62a, 62b, 62c, 62d via the anilox rolls 64a, 64b, 64c, 64d. The substrate F is passed between the plate cylinders 62 a, 62 b, 62 c, and 62 d, and the plate cylinders 62 a, 62 b, 62 c, and 62 d are passed through the common cylinder 61. By pressing with a predetermined pressure, ink is applied to one surface of the substrate F, that is, printing is performed. In FIGS. 5 and 6, ink chambers are shown as examples of the ink supply means 56, 66a, 66b, 66c, and 66d. However, it is possible to adopt a combination structure of a known ink tank and doctor blade. Needless to say.

  The anilox roll is made of, for example, steel, chromium, copper, and / or ceramics, and has a structure including a uniform recess (cell) structure formed on the surface by engraving, etching, or laser. . In flexographic printing, the anilox roll cell volume is changed to adjust the printing density, and the number of anilox roll cells is changed in accordance with the number of printing cylinder lines. For example, in order to obtain a high printing density, an anilox roll with a large cell volume is used. On the other hand, when printing is performed with a plate cylinder having a high number of lines and a plate cylinder containing fine character data. For this, an anilox roll formed with cells having a high line number is used in order to avoid quality defects such as character fattening and dipping. For this reason, in the past, many anilox rolls with different cell volumes and cell line numbers were prepared so that changes in the printing density and the number of lines on the plate cylinder could be accommodated, and different anilox rolls were used depending on the printing conditions. It was. In addition, an anilox roll having a high number of lines and a high cell volume is required in order to realize a high printing density in a printed matter having a high number of lines. However, in the current anilox roll, the larger the number of lines, the smaller the opening size of the cell. Therefore, the cell volume has to be reduced due to processing restrictions, and both a high number of lines and a high cell volume are achieved. It was very difficult to make an anilox roll.

  Therefore, in order to eliminate the difficulties of the conventional anilox roll described above, an anilox roll body having a large number of cells regularly formed with a constant number of lines on the peripheral surface, and attached to the peripheral surface of the anilox roll body, the constant An anilox roll structure having a surface material having a large number of through-holes regularly formed with a number of lines, and a structure in which an anilox roll cell is formed by a through-hole of the surface material and a cell below the structure is proposed. (Patent Document 1). In this proposal, there is a problem that an extra production work is required because the surface material needs to be produced separately.

  In addition, in the conventional anilox roll structure, it is difficult to change the coating thickness of the coating liquid such as applied ink. To change the coating thickness, for example, the anilox roll and the plate cylinder are different in circumference. A method of rotating at high speed (Patent Document 2) and the like are known, but even with such means, the change of the coating film thickness cannot be said to be sufficient.

  On the other hand, cells corresponding to characters and lettering images that require a high ink density are formed on the AM screen, and photographic images expressed in gradation and fine line cells are on the gravure printing roll formed on the FM screen. Proposals have been made (Patent Document 3).

FIG. 7 shows a normal gravure AM screen (Amplitude Modulation Screen). The gravure plate includes a cell formation method by engraving method and a cell formation method by photosensitive film coating-exposure-development-etching (etching method). In the cell formation method by the engraving method, since the cells are formed in a quadrangular pyramid, the ink transfer at the highlight portion is good. In the etching method, the cell is formed in a shallow dish-shaped recess, so that the ink transfer is inferior to the engraving method due to the ink clogging in the cell in the highlight portion where the cell is very small. In addition, there is an advantage that the ink can be surely transferred to the intersecting portion because the ink flows at the intersecting portion of the screen line of the most shadow portion, and the outline of the character can be made an outline without jaggedness, and further, the most shadow portion This cell is also shallow and suitable for printing using water-based ink.

  FIG. 8 shows an FM screen (Frequency Modulation Screen) of an offset printing plate or a flexographic printing plate. FM screens such as offset printing plates also express gradation in halftone dots, but unlike gravure plates, screen lines are not required, so plate gradations correspond to 0 to 100% of print gradations almost exactly. doing.

In recent years, in the fields of offset printing and flexographic printing, an FM screen system that represents gradation expression by the number of minute dots has been put into practical use, as shown in FIG. 8, instead of the conventional AM screen system shown in FIG. . With FM screen technology, the resolution of the minimum drawing dot that uses the fine structure representation is obtained. It is impossible to engrave an FM screen with the engraving method, but it is possible with photolithography. In the present specification, an AM screen cell is a cell made of laser plate making consisting of photosensitive film coating-laser exposure-latent image formation-development-etching process, the array pitch is constant, and the cell size changes. And a cell made of a diamond stylus of an electronic engraving machine and having a constant arrangement pitch and a change in cell size and depth, and other cells having a constant arrangement pitch.

JP 2006-76221 A JP-A-5-96702 JP 2004-284295 A

The present invention has been devised as a result of repeated research to solve the above-mentioned problems of conventional anilox rolls, and performs high-precision printing using a plate cylinder containing a high number of lines and fine character data. In this case, quality defects such as thick characters and dipping can be avoided, the amount of ink supplied can be made uniform and moiré can be suppressed, and ink can be supplied to areas that require high printing density. On the other hand, when high-number plate cylinders and plate cylinders containing fine character data are used for precision printing, it is possible to reduce the ink consumption and reduce the amount of ink used. An object of the present invention is to provide an anilox roll, a method for producing the anilox roll, and a coating apparatus and a coating method including the anilox roll.

In order to solve the above-mentioned problems, the present anilox roll is an anilox roll having a large number of cells on the entire peripheral surface, and all of the cells are formed of an FM screen.

The anilox roll of the present invention is an anilox roll having a large number of cells on the entire circumferential surface, wherein a part of the large number of cells is formed of an AM screen and the remaining cells are formed of an FM screen. In the AM screen portion, the ink supply amount is increased, and in the FM screen portion, the ink supply amount is decreased. In this A two Rocks roll, the portion requiring a large consisting ink supply amount is formed on the plate cylinder, for example, the portion requiring the character portion and the small becomes the ink supply amount, for example, circumference of the anilox roll in correspondence with the fine pattern portion An AM screen portion and an FM screen portion are formed on the surface.

Oite the anilox roll of the present invention, the anilox roll body, and covers the cell forming layer number of the cell body is formed provided and the surface on the surface of the anilox roll body, the surface of the cell forming layer It is preferable to include a reinforcing coating layer provided on the surface of the cell forming layer so as to form the large number of cells.

  Preferably, the cell forming layer is a copper plating layer, and the reinforcing coating layer is a DLC layer, a chromium plating layer, or a silicon dioxide film.

  An anilox roll manufacturing method of the present invention is an anilox roll manufacturing method of the present invention described above, the step of preparing an anilox roll body, the step of forming a cell forming layer on the surface of the anilox roll body, The method includes a step of forming a large number of cell bodies on the surface of the cell forming layer, and a step of forming a reinforcing coating layer on the surface of the cell forming layer.

The unit type coating apparatus of the present invention includes an impression cylinder, a plate cylinder provided to face the impression cylinder, and an anilox roll provided to face the circumferential surface of the plate cylinder at a position different from the impression cylinder. A coating liquid supply means disposed on the peripheral surface of the anilox roll and installed so as to supply a predetermined amount of coating liquid to the peripheral surface of the anilox roll during a printing operation, the anilox roll Is an anilox roll of the present invention described above.

The center drum type coating apparatus according to the present invention includes a common impression cylinder, a plurality of plate cylinders each provided to face the common impression cylinder, and a plurality of plate cylinders each having a circumferential surface. A plurality of anilox rolls provided facing each other at a position different from the common impression cylinder, and a plurality of coatings installed so as to supply a predetermined amount of coating liquid to each peripheral surface of the plurality of anilox rolls, respectively. And a liquid supply means, wherein the anilox roll is the anilox roll of the present invention described above.

This coating method, using a unit type coating device or the center drum type coating apparatus equipped with a present anilox roll as described above, characterized in that applying the coating solution as there is no occurrence of uniform Toshikatsu moire ink supply amount .

The method of applying the present invention, as there is no possible and moire change ink usage relative to the unit type coating device or the center drum type coating apparatus equipped with a anilox roll used, necessary portions of the present invention described above It is characterized by applying a coating solution.

The object to be coated is formed by applying a coating solution by the coating method of the present invention.

  According to the present invention, when performing precision printing with a plate cylinder having a high line number or a plate cylinder including fine character data, it is possible to avoid quality defects such as character thickening and dipping, and the amount of ink supplied In the area where high printing density is required, the amount of ink supply is increased, while high-number plate cylinders and fine character data are included. When performing precision printing using a plate cylinder, an anilox roll capable of reducing the amount of ink used by reducing the amount of ink supplied, a coating apparatus such as a printing apparatus including the anilox roll, and the printing apparatus are used. A coating method such as a printing method and an object to be coated applied by a coating method such as the printing method are provided.

It is a perspective view which shows the principal part of the coating device provided with this anilox roll. FIG. 3 is a cutaway perspective view showing a main part of a coating apparatus provided with the anilox roll of the present invention. It is the enlarged top view and the expanded sectional view of the part X in FIG. FIG. 3 is an enlarged top view and an enlarged sectional view of a portion Y and a portion Z in FIG. 2. It is a side surface schematic explanatory drawing which shows an example of a unit type coating device. It is a side surface schematic explanatory drawing which shows an example of a center drum type coating device. It is explanatory drawing which shows an example of AM screen. It is explanatory drawing which shows an example of FM screen. It is explanatory drawing which shows the manufacturing process of the anilox roll of this invention typically, (a) is the whole perspective view of an anilox roll main body, (b) is a cross section which shows the state which formed the cell formation layer on the surface of the anilox roll main body (C) is a sectional explanatory view showing a state in which cells are formed in the cell forming layer, and (d) is a sectional explanatory view showing a state in which a reinforcing coating layer is formed on the surface of the cell forming layer.

Embodiments of an anilox roll of the present invention will be described below with reference to the accompanying drawings. Figure 1 is a defamation perspective view showing a main part of a coating apparatus provided with the present anilox roll, FIG. 3 is an enlarged top view of a portion X in FIG. In FIG. 1, reference numeral 10 denotes an embodiment of the present coating apparatus, and the overall structure thereof is a unit type coating apparatus shown in FIG. 5, such as a flexographic printing apparatus 50 or a center drum type coating apparatus shown in FIG. Since it is basically the same as the flexographic printing apparatus 60, only its essential parts are shown, and re-explanation of the entire structure is omitted to avoid redundancy.

The coating apparatus 10 is a conventional flexographic apparatus shown in FIG. 5 or FIG. 6, as described above, except that the structure of the anilox roll is different, the same structure. A plate cylinder 12 has the same structure as the plate cylinders 52 and 62a to 62d shown in FIGS. Convex characters ABC 13 to be printed are formed on the surface of the plate cylinder 12. Reference numeral 14 denotes an anilox roll provided to face the surface of the plate cylinder 12. The present anilox roll 14 is an anilox roll having a large number of cells 18 on the entire peripheral surface 16, and all of the cells 18 are formed by FM screen portions as shown in FIGS. 1 and 3. And

  By installing the anilox roll 14 having such a configuration in the coating apparatus 10, the supply amount of the coating liquid such as ink is made uniform and moire is not generated, and ink or the like is applied to the printed material or the coated material such as a film. The application liquid can be applied and the amount of the application liquid such as ink can be reduced.

FIG. 2 is a perspective view showing a main part of a coating apparatus equipped with the anilox roll of the present invention, and FIG. 4 is an enlarged cross-sectional view of a portion Y and a portion Z in FIG. In FIG. 2, reference numeral 20 denotes an embodiment of the coating apparatus of the present invention, and the overall structure thereof is a unit type coating apparatus shown in FIG. 5, for example, a flexographic printing apparatus 50 or a center drum type coating apparatus shown in FIG. For example, since it is basically the same as that of a flexographic printing apparatus, only its essential parts are shown, and re-explanation of the entire structure is omitted to avoid redundancy.

  As described above, the coating apparatus 20 of the present invention has the same structure as the conventional flexographic printing apparatus shown in FIG. 5 or 6 except that the structure of the anilox roll is different. A plate cylinder 22 has the same structure as the plate cylinders 52 and 62a to 62d shown in FIGS. In the coating apparatus 20 of the present invention shown in FIG. 2, convex character ABC portions 26 and spiral thin wire portions 28 to be printed are formed on the surface of the plate cylinder 22. In the example of FIG. 2, the character ABC portion 26 is printed with a large ink supply amount and printed with a dark ink density, and the thin line portion 28 is printed with a small ink supply amount so that no moire is generated. Part. Reference numeral 24 denotes an anilox roll provided to face the surface of the plate cylinder 22.

  The anilox roll 24 of the present invention is an anilox roll having a large number of cells on the entire circumferential surface 30, and a portion requiring a large ink supply amount formed on the plate cylinder 22 as shown in FIGS. 2 and 4. That is, the first application portion 34 and the second application portion 36 are formed by a large number of cells on the peripheral surface of the anilox roll 24 corresponding to the character ABC portion 26 and the portion requiring a small ink supply amount, that is, the spiral thin wire portion 28. Has been. As shown in FIG. 4, the cell 34a of the first application portion 34 is formed of an AM screen (arrow Y portion in FIG. 4), while the cell 36a of the second application portion 36 is formed of an FM screen (FIG. 4). 4), an ink supply amount is increased in the first application portion 34 by the AM screen, and an ink supply amount is decreased in the second application portion 36 by the FM screen.

  In the illustrated example of FIG. 2, the shape of the first application portion 34 and the second application portion 36 is a quadrangle, but it is not a circle or an ellipse, but the character portion 26 and the thin line portion 28 formed on the plate cylinder 22. Correspondingly, a similar shape can be used. In short, the character portion 26 and the fine line portion 28 are supplied to the character portion 26 and the fine line portion 28 so that a predetermined amount of ink is supplied to the character portion 26 and the fine line portion 28 of the plate cylinder 22 by the application portions 34 and 36 formed on the peripheral surface of the anilox roll 24. The corresponding area portion may be formed on the peripheral surface of the anilox roll 24 as the application portion.

  By installing the anilox roll 24 having such a configuration in the coating apparatus 20, it is possible to apply the coating liquid so that the supply amount of the coating liquid such as ink is uniform and no moire occurs, and high printing is performed. In areas where density is required, the ink supply amount is increased. On the other hand, when performing high-precision plate cylinders with high line numbers or plate cylinders containing minute character data, the ink supply amount is reduced and ink, etc. The advantage that the amount of the coating liquid used can be reduced can be realized.

  The anilox roll of the present invention is made of steel, chromium, copper and / or ceramics, etc., as in the conventional anilox roll, and has a structure having a cell structure on the surface. The difference from the structure is that the cell surface is a mixed cell of an AM screen and an FM screen in which the entire peripheral surface is a cell structure by an FM screen or a part of the cell structure is an AM screen and the rest is a cell structure by an FM screen. The point is the structure.

  The cell formation in the anilox roll of the present invention may be performed by applying a conventional method of forming a cell using an FM screen and an AM screen, and a conventional method can also be applied to the production of the anilox roll. The manufacturing method will be briefly described. FIG. 9 is an explanatory view schematically showing the manufacturing process of the anilox roll of the present invention, where (a) is an overall perspective view of the anilox roll body, and (b) is a cell-forming layer formed on the surface of the anilox roll body. (C) is a partially enlarged sectional explanatory view showing a state in which cells are formed in the cell forming layer, and (d) is a partially enlarged view showing a state in which a reinforced coating layer is formed on the cell forming layer surface. FIG.

  As shown in FIG. 9, first, an anilox roll body 100 made of steel, chromium, copper and / or ceramics is prepared (FIG. 9 (a)), and then a cell forming layer is formed on the surface of the anilox roll body 100. For example, a copper plating layer 102 is formed (FIG. 9B). A cell 104 is formed on the cell formation layer 102 by lithography (photosensitive film coating-exposure-development-etching) or electronic engraving (FIG. 9C).

  The AM screen applied in the present invention may be formed by either a cell forming method using an electronic engraving machine or a cell forming method using photosensitive film coating-exposure-development-etching. The FM screen cannot be made by a cell forming method by an electronic engraving machine, but is formed by a cell forming method by photosensitive film coating-exposure-development-etching.

  The reinforcing coating layer 106 is formed on the surface of the cell forming layer in which the cell 104 is formed, for example, the copper plating layer 102, and the anilox roll 108 is completed. As the reinforcing coating layer, a DLC layer, a chrome plating layer, a silicon dioxide film, or the like may be applied. Since the formation of these reinforced coating layers can be performed by a conventional method, a detailed description of the procedure for forming the individual reinforced coating layers is omitted.

  As described above, in the present invention, when all the cells on the peripheral surface of the anilox roll are formed with an FM screen, the generation of moire can be avoided, and no line break occurs even in printing of five colors or more. There are advantages that printing of the resolution can be reproduced, that the density jump is not conspicuous, and that the amount of ink supplied can be reduced as compared with the case where the cells are formed by an AM screen.

  Further, in the present invention, when a part of the cells on the peripheral surface of the anilox roll is formed with an AM screen and the remaining cells are formed with an FM screen, printing corresponding to characters and lettering images that require a dark ink density is required. For the anilox roll portion corresponding to the portion, the cells are formed by the AM screen, so that the ink is supplied so that the dark ink density is sufficiently secured, while the photographic image expressed by gradation and the printed portion corresponding to the thin line For the anilox roll part corresponding to, by forming the cell with an FM screen, the occurrence of moire can be avoided, line breakage does not occur even when printing with 5 colors or more, high-resolution printing reproduction is possible, and density jump is conspicuous When you can enjoy the advantages of not having, and all cells are formed with AM screen There is advantage of being able to reduce the supply amount of ink in comparison.

DESCRIPTION OF SYMBOLS 10: This coating apparatus, 12: Plate cylinder, 13: Convex character, 14, 54, 64a, 64b, 64c, 64d, 108: Anilox roll, 16: All-around surface, 18, 104: Cell, 20: Book Inventing coating device, 22: plate cylinder, 24: anilox roll, 26: convex letter ABC portion, 28: spiral thin wire portion, 30: entire circumferential surface, 34: first coating portion, 34a: cell portion by AM screen 36: second coating portion, 36a: cell portion by FM screen, 50: unit type coating device, 51: impression cylinder, 52: plate cylinder, 56: ink supply means, 60: center drum type coating device, 61: Common impression cylinder, 62a, 62b, 62c, 62d: plate cylinder, 66a, 66b, 66c, 66d: ink supply means, 68: guide roll, F: substrate, 100: anilox Lumpur body, 102: cell forming layer, 106: reinforcing coating layer, 108: anilox roll.

Claims (7)

  An anilox roll having a large number of cells on the entire peripheral surface, wherein a part of the large number of cells is formed of an AM screen and the remaining cells are formed of an FM screen. In the AM screen portion, ink is supplied. An anilox roll having a large amount and a small ink supply amount in the FM screen portion.   An anilox roll body, a cell forming layer provided on the surface of the anilox roll body and having a large number of cell bodies formed on the surface, and covering the surface of the cell forming layer to form the plurality of cells. The anilox roll according to claim 1, further comprising a reinforcing coating layer provided on a surface of the cell forming layer.   The anilox roll according to claim 2, wherein the cell forming layer is a copper plating layer, and the reinforcing coating layer is a DLC layer, a chromium plating layer, or a silicon dioxide film.   It is a manufacturing method of the anilox roll of any one of Claims 1-3, Comprising: The process of preparing an anilox roll main body, The process of forming a cell formation layer in the surface of this anilox roll main body, This cell formation layer A method for producing an anilox roll, comprising: a step of forming a large number of cell bodies on the surface of the substrate; and a step of forming a reinforcing coating layer on the surface of the cell forming layer.   An impression cylinder, a plate cylinder provided opposite to the impression cylinder, an anilox roll provided opposite to the circumferential surface of the plate cylinder at a position different from the impression cylinder, and a circumferential surface of the anilox roll A coating liquid supply means disposed so as to supply a predetermined amount of coating liquid to the peripheral surface of the anilox roll during a printing operation, wherein the anilox roll is any one of claims 1 to 3 A unit type coating apparatus, wherein the anilox roll according to claim 1 is used.   A common impression cylinder, a plurality of plate cylinders each provided facing the common impression cylinder, and opposed to each peripheral surface of the plurality of plate cylinders at positions different from the common impression cylinder. A plurality of anilox rolls, and a plurality of coating liquid supply means installed so as to supply a predetermined amount of coating liquid to each peripheral surface of the plurality of anilox rolls, respectively. And the said anilox roll is an anilox roll of any one of Claims 1-3, The center drum type coating device characterized by the above-mentioned.   Applying the coating liquid using the coating apparatus according to claim 5 or 6 comprising the anilox roll according to claim 1 so that the amount of ink used can be changed to a necessary portion and no moiré is generated. A characteristic coating method.

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