JP2018114712A - Printing plate and manufacturing method therefor, and manufacturing method of decorative sheet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a printing plate capable of improving transferability of ink from a cell to an object to be printed, a method for manufacturing the same, and a method for manufacturing a decorative sheet. A printing plate 1 is a printing plate 1 in which a plurality of cells 6 corresponding to a pattern or the like are formed on a printing surface, and ink supplied to the plurality of cells 6 is transferred to an object to be printed. The plurality of cells 6 have a non-circular opening having at least one corner on the periphery of the opening. [Selection diagram] Fig. 1

Description

  The present invention relates to a printing plate, a method for producing the same, and a method for producing a decorative sheet, and in particular, a printing plate in which a plurality of cells corresponding to a pattern or the like are formed on a printing surface of a cylinder, a method for producing the printing plate, and a decorative sheet. It relates to a manufacturing method.

For example, in gravure printing, a cylindrical printing plate is used, and a large number of minute concave portions called cells are formed on the surface of the printing plate according to a pattern or the like, and liquid ink is supplied to the surface of the printing plate. Thereafter, the pattern on the surface other than the cells is scraped off and only the ink in the cells is transferred to a printing medium such as paper or a plastic film so that the pattern is printed (for example, Patent Document 1). .
Products that employ this gravure printing include knock-down furniture RTA (Ready to Assembly furniture) decorative paper, melamine decorative sheet titanium paper, kitchen components, steel sheet laminate sheets, building interior materials, exterior materials, aluminum A decorative sheet as a surface decorative member for building materials and home appliances, such as a sheet for wrapping on a base material, is known. In recent years, a decorative sheet having a glitter property by adding a glitter pigment to ink is used. Has been developed.

JP-A-4-350654

By the way, many conventional printing plates have a circular opening in the cell, and the cell having a circular opening tends to deteriorate the transferability of ink to the printing medium in relation to the cell depth. There is.
In addition, when the ink contains a bright pigment (particularly a pearl pigment) having a particle size larger than the particle size of the ink, the transferability of the bright pigment to the printed material is likely to decrease. There is a risk that the brightness will be reduced.
The present invention has been made paying attention to the above points, and can improve the transferability of ink from the cell to the printing medium, and the ink pigment contains a glitter pigment Even so, it is an object of the present invention to provide a printing plate and a method for producing the same, and a method for producing a decorative sheet, which can improve the brightness of the substrate.

In order to solve the problem, a printing plate according to an embodiment of the present invention includes a printing plate in which a plurality of cells corresponding to a pattern or the like are formed on a printing surface, and ink supplied to the plurality of cells is transferred to a printing medium. In
Among the plurality of cells, there is a cell having a non-circular opening having at least one corner provided on the periphery of the opening.
Further, the method for producing a printing plate of one aspect of the present invention includes a step of providing a nickel plating layer on the surface of a cylinder,
Providing a copper plating layer on the nickel plating layer;
On the copper plating layer, a step of providing a photosensitive material layer that reacts with a laser beam;
Patterning the photosensitive material layer by laser engraving by laser beam irradiation;
Forming a cell having a non-circular opening provided with at least one corner on the periphery of the opening in the copper plating layer using the pattern of the photosensitive material layer as a mask;
including.

Moreover, the method for producing a decorative sheet according to one aspect of the present invention is a method for producing a decorative sheet by using the above-described printing plate and forming a printing layer on one surface side of the base sheet,
Supplying ink to the plurality of cells formed on the printing surface of the printing plate;
Transferring the ink in the plurality of cells of the printing plate to one surface of the substrate sheet to form the printing layer; and
including.

  According to one embodiment of the present invention, the transferability of ink from the cell to the printing medium can be improved, and the brightness of the printing medium can be achieved even when the ink pigment contains a bright pigment. It is possible to provide a printing plate and a method for producing the same, and a method for producing a decorative sheet.

It is a figure which shows the structure in one Embodiment of a printing plate, (a) is sectional drawing, (b) is a partial top view of (a). It is sectional drawing which shows the depth of the cell formed in the printing plate of FIG. It is sectional drawing explaining the manufacturing method of a printing plate. It is a top view which shows the other shape of the cell formed in the printing plate used for other embodiment of the manufacturing method of a decorative sheet. It is a figure which shows the structure in one Embodiment of a decorative sheet.

Next, an embodiment of the present invention will be described with reference to the drawings. In the following description of the drawings, the same or similar parts are denoted by the same or similar reference numerals. However, it should be noted that the drawings are schematic, and the relationship between the thickness and the planar dimensions, the ratio of the thickness of each layer, and the like are different from the actual ones. Therefore, specific thicknesses and dimensions should be determined in consideration of the following description. Moreover, it is a matter of course that portions having different dimensional relationships and ratios are included between the drawings.
Further, the following embodiments exemplify apparatuses and methods for embodying the technical idea of the present invention, and the technical idea of the present invention is the material, shape, structure, and arrangement of components. Etc. are not specified below. The technical idea of the present invention can be variously modified within the technical scope defined by the claims described in the claims.

(Printed version)
FIGS. 1-4 is a figure regarding the printing plate 1 used by the gravure printing of this embodiment.
<Configuration>
As shown in FIGS. 1A and 1B, the printing plate 1 of the present embodiment has a cylindrical shape, for example, a nickel plating layer 3 provided on the surface of an iron cylinder 2, and a nickel plating layer 3. It has a copper plating layer 4 provided on the top and a plurality of cells 6 formed on the surface of the copper plating layer 4. The plurality of cells 6 include, for example, a plurality of cells 6, 6, 6,... Having different opening sizes. A plurality of cells 6, 6, 6,... Are formed at positions corresponding to a pattern or the like to be printed on the printing medium.

As shown in FIG. 1B, the cell 6 has, for example, a shape having a rectangular opening 6a and a flat bottom surface 6b, and the diagonal length d of the opening 6a is set to, for example, 30 to 200 μm. Has been. Here, the diagonal line refers to the maximum dimension at the diagonal of the opening.
Here, the planar shape of the openings 6a of the plurality of cells 6 may be the same or different, as long as it is other than a circle (including an ellipse). Moreover, all the sizes of the openings may be the same or different.

In addition, the depth h (see FIG. 2) of each of these cells 6 is set to 30 μm or more and 90 μm or less. As will be described later, the depth of a cell created by Helio printing is preferably about 60 μm. The depth of the produced cell is preferably 30 μm or more and 90 μm or less. If the depth h of these cells 6 is less than 30 μm, the amount of ink that accumulates in the cells is small, and the gradation of the printing density cannot be stably performed. Moreover, when the depth h of these cells 6 is greater than 90 μm, the ink tends to remain, and the ink transferability may be reduced.
The cell 6 may set the aspect ratio according to the length d and the depth h of the diagonal line of the opening 6a within a predetermined range.

[Production method]
Next, a method for manufacturing the printing plate 1 shown in FIGS. 1 and 2 will be described with reference to FIGS.
First, the iron cylindrical cylinder 2 shown in FIG. 3A is held by the holding device 50 so as to be rotatable in the axial direction. Then, nickel plating is applied to the circumferential surface 2a of the cylinder 2, and a nickel plating layer 3 is formed on the surface 2a of the cylinder 2 as shown in FIG. The thickness of the nickel plating layer 3 is, for example, about 7 μm.
Next, as shown in FIG. 3C, a copper plating layer 4 is formed on the nickel plating layer 3. The thickness of the copper plating layer 4 is, for example, about 200 to 300 μm.

Next, as shown in FIG. 3D, a light-sensitive material layer 5 that reacts with a laser beam is formed on the copper plating layer 4. The light-sensitive material layer 5 is made of a layer made of a light-sensitive material that reacts with a laser beam, and is not particularly limited as long as it functions as a resist. The light-sensitive material layer 5 is formed, for example, by applying a liquid material dispersed in a dispersion medium or the like on the copper plating layer 4 and drying it.
Next, as shown in FIG. 3E, laser engraving is performed to form a desired pattern 5A by irradiating the photosensitive material layer 5 with a laser beam from the YAG laser device 8. This YAG laser device 8 is installed so as to be movable in, for example, the R1, R2 direction on the plane that is equidistant from the photosensitive material layer 5 in FIG. Is done.

  In laser irradiation by the YAG laser device 8, for example, “cylinder rotation number”, “beam number”, “beam feed pitch (μm)”, and “beam irradiation interval” are set according to the desired pattern to be formed. Is set. Here, the “number of rotations of the cylinder” is, for example, preferably 600 to 1000 rpm, and more preferably 800 rpm. Further, examples of the “number of beams” include a 1-beam system, a 2-beam system, and a 4-beam system. The “beam feed pitch” refers to a pitch for moving the YAG laser device 8 along the axial direction of the cylinder. As the “beam irradiation interval”, “spiral type”, “intermittent type”, or the like is selected. These conditions are set in an appropriate combination in consideration of accuracy and efficiency in accordance with a desired pattern to be formed.

  A plurality of cells 6 are formed by laser engraving by the YAG laser apparatus 8 so that each opening 6a has a non-circular shape (including a non-elliptical shape) and each depth h is 30 μm or more and 90 μm or less. . That is, the openings 6a of the plurality of cells 6 have a noncircular shape (including a non-elliptical shape) so that at least one corner is provided on the periphery (opening periphery) of the opening 6a. Make.

Next, as shown in FIG. 3 (f), the copper plating layer 4 is corroded by applying an etching solution 9 using the photosensitive material layer 5 patterned according to a desired cell shape by laser drawing as a mask, A cell 6 having a desired shape is formed on the copper plating layer 4 (see FIG. 3G). The “cell 6 having a desired shape” is a cell 6 having an opening shape as shown in FIG.
Next, as shown in FIG. 3 (h), the photosensitive material layer 5 is removed, and a plurality of cells 6 formed on the copper plating layer 4 are exposed.
Next, the wear resistance is improved by providing the chromium plating layer 10 on the surface 4a of the copper plating layer 4 in FIG. 3 (h) (see FIG. 3 (i)). The chrome plating layer 10 is preferably provided, but the surface of the copper plating layer 4 (including the chrome plating layer 10) functions as a printing surface.
As described above, the printing plate 1 in which the plurality of cells 6 are formed is manufactured by performing the steps of FIGS.

As another embodiment, as shown in FIG. 4, the shape of the opening 6a of the plurality of cells 6, 6, 6,... Formed on the surface of the copper plating layer 4 is not a square but a hexagon. Also good. Also in such an aspect, the dimension d of the diagonal line of the opening 6a is preferably 30 to 200 μm.
In addition, the shape of the plurality of cells 6 formed on the surface of the copper plating layer 4 may be only a circular shape. However, as described above, the non-circular shape includes better ink transfer properties, and different non-circular openings. A cell 6 having a portion may be formed on the copper plating layer 4.

As described above, the plurality of cells 6 having the non-circular openings 6a such as a quadrangle and a hexagon are filled in the cells as compared with the cells provided with the circular openings formed in the conventional printing plate. Ink transfer property when the transferred ink is transferred to the printing medium can be improved.
Further, by setting the depth h of the plurality of cells 6 to 30 μm or more and 90 μm or less, the transfer property of the ink to the printing medium is further improved.
Further, in the manufacturing process of the printing plate 1, when laser engraving is performed by irradiating a laser beam from the YAG laser device 8 toward the copper plating layer 4, the cell 6 having a square opening can be made high by a short laser irradiation. It can be formed with high accuracy. As a result, the manufacturing cost of the printing plate 1 can be reduced.

<Coating sheet>
[Constitution]
As shown in FIG. 5, the decorative sheet 15 is formed by laminating a printed layer 17 and a medium coat layer 18 in this order on one side of a base sheet 16.
The base material sheet 16 is comprised from the resin film, and the colored polypropylene resin is used as a resin film, for example.
The print layer 17 is for printing a dot pattern of a predetermined pattern on the base sheet 16. The ink contains a glitter pigment (pearl pigment) to form a glitter pattern. In addition, the decorative sheet of this embodiment is shown with respect to the printing layer 17 so that it may be contained in the predetermined range with 60 degree specular glossiness based on JISZ8741: 1997, for example.

As the bright pigment contained in the ink, for example, a pearl pigment in which natural mica is coated with a metal oxide such as titanium oxide or iron oxide can be suitably used, and other metal powders such as aluminum powder can also be used. . A plurality of kinds of the glitter pigments may be included.
The medium coat layer 18 is formed by applying a transparent resin mainly composed of medium on the printing layer 17.
Moreover, the decorative board of this embodiment is obtained by laminating a substrate (not shown) on the side of the decorative sheet 15 opposite to the side on which the printed layer 17 of the base sheet 16 is formed. Then, the print layer 17 is shown to fall within a predetermined range in which the 60-degree specular gloss according to JIS Z8741: 1997 is high.

<Manufacturing method of decorative sheet>
Next, a method for manufacturing the decorative sheet 15 will be described.
Here, the dot pattern used for the printing layer 17 is a pattern transferred from the ink filled in a large number of cells 6 formed on the printing surface (copper plating layer 4) of the printing plate 1.
First, ink containing a bright pigment is supplied to the printing surface of the printing plate 1 to fill the interior of a large number of cells 6 with ink.

Next, the ink on the printing surface other than the cell 6 is scraped off.
Next, the printing layer 17 is formed by transferring the ink filled in each cell 6 onto the base sheet 16 by rotating the cylinder 2 and moving the base sheet 16 to the printing surface. The process of transferring this ink onto the base material sheet 16 is performed by changing the printing position over a plurality of plates by changing the printing plate 1 having the shape of the opening 6a of the cell 6 or the depth of the cell 6 being different. You may transcribe.
Next, by applying a transparent resin mainly composed of medium on the printing layer 17 laminated on the base material sheet 16, the medium coating layer 18 is laminated on the printing layer 17, and the decorative sheet 15 is manufactured. The

  Thus, according to one embodiment of the method for manufacturing a decorative sheet, each cell 6 formed on the printing surface of the printing plate 1 has a rectangular opening 6a having four corners on the opening periphery. ing. Therefore, the ink transfer property when the ink filled in each of the cells 5 to 7 is transferred to the base sheet 16 is improved, and the gradation of the printing density of the printing layer 17 can be stably performed. In particular, by setting the depth h of the plurality of cells 6 to 30 μm or more and 90 μm or less, the transfer property of the ink to the printing medium is further improved.

Further, since the glitter pigment contained in the ink also has good transferability to the base sheet 16, the brightness of the printed layer 17 is also stabilized.
Therefore, it is possible to provide the decorative sheet 15 in which the pattern is clearly visible, the design is high, and the brightness is good.
In addition, in one Embodiment of the manufacturing method of the decorative sheet 15 mentioned above, although demonstrated using the printing plate 1 in which the cell 6 which has the square opening part 6a was formed, polygonal shape including a hexagon is used. Even if it is manufactured using the printing plate 1 in which the cell 6 having the opening 6a is formed, the same effect can be obtained.

<About other effects>
In the printing plate 1 shown in FIGS. 1 and 2, each cell 6 having a square opening 6a is formed in the copper plating layer 4 (printing surface). In the printing plate 1 shown in FIG. An embodiment was disclosed in which each cell 6 in which a hexagonal opening 6a was provided on the plating layer 4 (printing surface) was formed. However, the shape of the opening of the cell 6 is not limited to a quadrangular shape or a hexagonal shape. If the cell has a non-circular opening having at least one angle, the same effect as described above can be obtained. Can play. For example, the same effect as described above can be obtained even in a cell provided with a triangular opening provided with three corners or a fan-shaped cell provided with one corner.

  Furthermore, not all of the cells formed on the copper plating layer 4 (printing surface) are cells provided with non-circular openings provided with at least one corner, but also cells provided with circular openings are mixed. If formed, the time for laser engraving to provide corners on the periphery of the opening can be shortened, and therefore the manufacturing cost of the printing plate 1 can be further reduced.

  The bottom 6b of each cell 6 (see FIGS. 1B and 4) has a flat shape, but the inner side surfaces on the opening side gradually converge into a smaller area toward the bottom. The shape which makes a cross section of an inverted triangle may be sufficient. Such a shape does not use laser light in the preparation of the above-described printing plate, but rotates a cylinder while rotating a cylinder with a predetermined number of lines (L / cm) and a helioo with a diamond stylus against the copper plating layer 4. Obtained by printing. The depth of the cell created by this helio printing is preferably about 60 μm.

Next, examples of the present invention will be described.
Example 1
<Preparation of the first printing plate>
First, a nickel plating layer, a copper plating layer, and a sensitive material layer were sequentially formed on the circumferential surface of an iron cylindrical cylinder. The thickness of the nickel plating layer was 7 μm, the thickness of the copper plating layer was 150 μm, and the thickness of the sensitive material layer was 6 μm.
Next, laser engraving was performed by irradiating a laser beam from the YAG laser device toward the sensitive material layer while moving the YAG laser device on a plane at almost equal intervals with the sensitive material layer. The photosensitive material layer was subjected to patterning composed of a plurality of cells having only a square shape with a diagonal dimension of 30 to 200 μm.

In addition, the patterning to the sensitive material layer by a laser was performed under the following conditions.
・ Cylinder speed: 600rpm
-Number of beams: 2 beams-Beam feed pitch: 4 μm
・ Beam irradiation interval: intermittent type Next, the copper plating layer is corroded by applying an etching solution (ferric chloride) using the photosensitive material layer patterned according to the desired cell shape by laser drawing as a mask. A plurality of cells having a desired shape were formed on the copper plating layer. At this time, the depth of each cell was adjusted to 90 μm.
Next, a chromium plating layer was formed on the surface of the copper plating layer to produce a first printing plate.

<Preparation of the second printing plate>
In the production of the first printing plate described above, a second printing plate was produced in the same manner as the production of the first printing plate, except that all the openings of the cells formed on the copper plating layer were hexagonal. .
<Preparation of third printing plate>
In the production of the first printing plate described above, a third printing plate was produced in the same manner as in the production of the first printing plate, except that the shapes of the openings of the cells formed on the copper plating layer were all circular.

<Preparation of the fourth printing plate>
First, a nickel plating layer and a copper plating layer were sequentially formed on the circumferential surface of an iron cylinder. The thickness of the nickel plating layer was 7 μm, and the thickness of the copper plating layer was 250 μm.
Next, while rotating the cylinder, helio printing with a diamond stylus was performed on the copper plating layer at a line number of 45 L / cm, and the depth was 60 μm, and the diagonal dimension was 30 to 200 μm. A fourth printing plate was prepared by forming the above cell on the copper plating layer.

<Production of decorative sheet>
Next, a decorative sheet of Example 1 was produced. Specifically, first, ink containing a luster pigment was supplied to the printing surface of the first printing plate to fill the interior of many cells with ink.
Next, the ink on the printing surface other than the cells was scraped off.
Next, a printing layer was formed by transferring the ink filled in the cells onto the base sheet by rotating the cylinder and moving the base sheet to the printing surface.
Next, a medium-coated layer was laminated on the printed layer by applying a transparent resin mainly composed of medium on the printed layer laminated on the base sheet, and the decorative sheet of Example 1 was obtained. .

(Example 2)
A decorative sheet of Example 2 was obtained in the same manner as in Example 1 except that the first printing plate used in Example 1 was changed to the second printing plate.
(Example 3)
A decorative sheet of Example 3 was obtained in the same manner as in Example 1 except that the first printing plate used in Example 1 was changed to the fourth printing plate.
(Comparative Example 1)
A decorative sheet of Comparative Example 1 was obtained in the same manner as in Example 1 except that the first printing plate used in Example 1 was changed to the third printing plate.
(Evaluation)
The decorative sheets of Examples 1 to 3 and Comparative Example 1 obtained as described above were evaluated for ink transferability and brightness.

<Ink transfer properties>
About the decorative sheets of Examples 1 to 3 and Comparative Example 1, the net shape of the printed material is confirmed with a microscope, and “◎” indicates that the net shape is sharp, “◯” indicates the lowest practical level, and the net shape is The crumbled thing was set as "x". The evaluation results are shown in Table 1.

<Luminance>
The decorative sheets of Examples 1 to 3 and Comparative Example 1 were visually evaluated for brightness. This evaluation method shows the level of glitter and is not particularly limited as long as it can be evaluated. Specifically, for example, in a dark place, light from a 40 W white fluorescent lamp (300 lux) is printed on a decorative sheet. Incident perpendicularly from a position separated by 50 cm from the surface on the layer side, makes an angle of 45 ° with the surface on the front side of the decorative sheet, and visually observes the decorative sheet from a position separated by a distance of 50 cm. “◎” indicates that the brightness is very high, and “◯” indicates that the brightness is high. The evaluation results are shown in Table 1.

As shown in Table 1, the decorative sheet produced by the printing plates of Examples 1 to 3 each having a cell having a non-circular opening formed on the printing surface has good ink transferability and brightness. I understood it.
In particular, from the evaluation results of Examples 1 to 3, the shape of the opening is good even in a rectangular shape, but the hexagonal shape is superior in the transferability of the ink transferred to the base sheet 16 and the decorative sheet 15 It was found that the brightness was also improved. Further, from the evaluation results of Examples 1 to 3, the brightness feeling of the decorative sheet produced by the first printing plate having a cell depth of 90 μm is particularly better than that of the third printing plate having a cell depth of 60 μm. I found out. That is, the decorative sheet produced using the laser-engraved first printing plate has a particularly good brightness feeling than the decorative sheet produced using the third printing plate engraved with the diamond stylus. all right.

As described above, the decorative sheets produced by the printing plates of Examples 1 to 3 have the following characteristics: “By containing a bright pigment having a large particle size, the transfer property of the bright pigment to the printing material is reduced, and as a result It has been found that the conventional problem of “feeling is lowered” is solved and “improvement of transferability and brightness” is realized. That is, it has been found that by using a printing plate with improved transferability, the brightness of decorative sheets and decorative plates produced using this printing plate together with ink containing a glittering pigment is naturally improved.
On the other hand, according to the printing plate of Comparative Example 1 in which the shape of the opening of the cell was only a circular shape, it was found that the brightness feeling was lowered because the transferability of the glitter pigment contained in the ink was deteriorated.

  As described above, according to the present invention, since the opening of the cell has a non-circular shape, the ink transfer property from the cell to the printing medium is improved, and the ink pigment contains a glitter pigment. Even in this case, it is possible to provide a printing plate having a good brightness feeling of the printing medium, a method for producing the same, and a method for producing a decorative sheet.

1 Printing plate 2 Cylinder (cylindrical body)
3 Nickel plating layer 4 Copper plating layer 5 Photosensitive material layer 6 Cell 6a Opening 6b Bottom surface 8 YAG laser device 9 Etching solution 10 Chrome plating layer 15 Cosmetic sheet 16 Base sheet 17 Print layer 18 Medium coat layer

Claims (6)

In a printing plate in which a plurality of cells corresponding to a pattern or the like are formed on the printing surface, and the ink supplied to the plurality of cells is transferred to a printing medium,
The printing plate according to claim 1, wherein the plurality of cells include a cell having a non-circular opening provided with at least one corner on the periphery of the opening. The length of the diagonal line of the openings of the plurality of cells is 30 μm or more and 200 μm or less,
The printing plate according to claim 1, wherein the depth of the plurality of cells is 30 μm or more and 90 μm or less.   The printing plate according to claim 1, wherein the plurality of cells are a cell having a circular opening and a cell having the non-circular opening. Providing a nickel plating layer on the surface of the cylinder;
Providing a copper plating layer on the nickel plating layer;
On the copper plating layer, providing a sensitive material layer that reacts with a laser beam;
Patterning the photosensitive material layer by laser engraving by irradiation with the laser beam;
Forming a cell having a non-circular opening having at least one corner on the periphery of the opening in the copper plating layer using the pattern of the light-sensitive material layer as a mask;
A method for producing a printing plate, comprising: A method for producing a decorative sheet by using the printing plate according to any one of claims 1 to 3 and forming a printing layer on one surface side of the base sheet,
Supplying ink to the plurality of cells formed on the printing surface of the printing plate;
Transferring the ink in the plurality of cells of the printing plate to one surface of the base sheet to form the printing layer; and
A method for producing a decorative sheet, comprising:   The method for producing a decorative sheet according to claim 5, wherein the ink contains a glitter pigment.

Images