JPH06183123A - Printing method - Google Patents

Abstract

PURPOSE:To provide a printing method wherein multicolor overprinting with excellent superposition precision can be performed without registering a printing position and without generating positional shift, necessary number of plates can be reduced, and arrow-mark, feathering, chipping and thinning of fine lines do not occur even by gravure printing. CONSTITUTION:On the surface of a body to be printed 1, a pattern 2 consisting of a protrusion with a flat top is provided. Solid printing is performed on the surface of the body to be printed 1 having the pattern 2 by using a first totally solid plate A containing a printing ink 3 attached to its front face. The ink is transferred to only on the surface of the protrusion of the pattern 2 so as to form a first ink layer 31. Further, the printing ink is transferred to only the surface of the protrusion of the pattern 2 by using a second totally solid plate B containing a printing ink 4 attached to it in the same way from the top of the body to be printed 1 having the first ink layer 31, so that a printed matter 5 wherein a second ink layer 41 is formed on the first ink layer 31 of the protrusion of the pattern 2 is formed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a printing method for performing arbitrary multicolor overprinting on a predetermined pattern by using a solid printing plate.

[0002]

2. Description of the Related Art Conventionally, in the case of printing a multicolor overprint pattern, the number of types of colors for overprinting a plate on which a predetermined identical pattern is formed is prepared, and a plate for the first color is formed on a substrate. The first color is printed using, and then the plate pattern for the second color is registered so that the pattern of the first color is exactly aligned with the printing pattern of the first color formed on the substrate. The second color is printed on the first color printing pattern, and the third and subsequent colors are similarly aligned using the plates prepared for each color so that the printing is performed only on the lower printing pattern. The method of printing was used.

[0003]

However, conventionally, in the case of printing a multicolor overprint pattern, the registration for accurately printing the pattern of the second and subsequent colors without misalignment on the print pattern formed first is conventionally required. There is a problem that not only it takes a very long time, but also misregistration often occurs and a good printed matter cannot be obtained. Further, since a plate used for printing is required for each color, N patterns are required for a pattern of N-color overprinting.
To prepare M N-color overprint patterns, N
There is a problem that a large number of plates of × M are required, a large plate-making cost, a plate-making required time are required, and a storage place is required to be secured.

Further, when the above-mentioned multicolor overprint pattern printing is performed by gravure printing, whiskers and fine lines may be chipped or faint (particularly in the case of a linear pattern), and the linear pattern may be perpendicular to the doctor moving direction. If it intersects at an angle close to, there is a problem that doctor streaks may occur along the doctor moving direction and the appearance of the printed matter deteriorates.

The present invention is intended to eliminate the above-mentioned drawbacks of the prior art. It is possible to perform multicolor overprinting with excellent overlay accuracy without misregistration even if the printing positions are not registered. The number can be reduced,
It is another object of the present invention to provide a printing method by which a printed matter having a good appearance can be obtained by the gravure printing without chipping of whiskers and fine lines, scratches and doctor streaks.

[0006]

According to the printing method of the present invention, a desired pattern is provided on the surface of an object to be printed as a flat convex portion on the top surface, and a full solid printing plate is used to print only on the top portion of the convex portion of the pattern. Printing is performed a plurality of times so that an ink layer is formed, and a plurality of printing ink layers are formed only on a desired pattern.

The present invention will be described below in detail with reference to the drawings. The drawings show one example of the printing method of the present invention, and FIG. 1 is a longitudinal sectional view showing each step in the case of forming a multicolor overprinting pattern by using the printing method of the present invention.

First, as shown in FIG. 1 (a), a pattern 2 having a flat top is provided on the surface of a material 1 to be printed. Next, as shown in FIG. 2B, solid printing is performed on the surface of the printing medium 1 on which the pattern 2 is provided using the first entire surface solid plate A having the printing ink 3 applied thereto, and the pattern 2 is projected. The ink is transferred only to the surface of the part to form the first ink layer 31. Further, as shown in FIG. 3C, a convex pattern 2 is formed on the printing medium 1 on which the first ink layer 31 is formed by using the second full-color solid plate B on which the printing ink 4 is applied in the same manner as above. By transferring the printing ink only to the surface of the portion, the printed matter 5 in which the second ink layer 41 is formed on the first ink layer 31 of the convex portion of the pattern 2 is obtained.

The first ink layer 31 and the second ink layer 41
However, since the types of ink are different, two types of solid printing plates A and B described above are used to print each of them, but if even the convex portions of the pattern 2 are accurately formed in a predetermined pattern, Requires only different plates for each color, and in this case, 2 + 1 plates are required to print one kind of pattern of two-color overprinting (shape of pattern consisting of convex portions). In particular, when the pattern 2 having the convex portions is formed by a method other than printing, a plate for printing the pattern 2 having the convex portions becomes unnecessary. Of course, it is also possible to perform overprinting using three or more types of full-color solid plates.

The material to be printed 1 serves as a base material for multicolor printing, and a material such as glass, metal, plastic, or ceramic is appropriately selected according to the purpose and application of the printed material. Further, the shape of the printing object 1 may be any shape as long as it can be printed on the surface of the printing object by a conventionally known printing method, such as a flat plate shape, a sheet shape,
A film or the like is appropriately used.

The pattern 2 composed of the convex portions formed on the surface of the printing medium 1 may be such that the tops of the convex portions are formed flat. As the material of the pattern 2, any material such as glass, metal, plastic, ceramic, etc. may be used similarly to the material to be printed 1, and it is appropriately selected according to the method of forming the pattern 2 composed of the convex portions. can do.

FIG. 2 is a vertical cross-sectional view of the object 1 to be printed having the pattern 2 on the surface for showing the shape of the convex portion of the pattern 2 and the positional relationship with the object 1 to be printed. As shown in the figure, as for the shape of the convex portion of the pattern 2 and the positional relationship with the printing object 1, it is sufficient that the ink does not transfer to the printing object 1. The difference may be appropriately determined according to the amount of ink applied to the solid plate, the printing pressure, the printing substrate, etc. Generally, the higher the height h of the convex portion, the more the ink layer is formed on the surface of the convex portion. When forming, the ink is less likely to transfer to the surface of the substrate 1 between the convex portions, and for example, when a gravure solid plate is used as the whole solid plate, the height h of the convex parts of the pattern 2 is 3 to 100 μm. It is preferable that the thickness is 5 to 20 μm.

Further, it is better that the interval w of the pattern 2 is narrower, and w is preferably 1 μm to 1 cm, and particularly 1
It is preferably ˜100 μm.

The smaller the height difference d between the patterns 2, the better. The d is preferably 10 μm or less, more preferably 2 μm or less.

Further, the smoother the surface of the convex portion of the pattern 2 is, the better the ink layer can be formed on the surface of the convex portion without difficulty, and the material to be printed between the convex portions of the ink is printed. 1 It is difficult to transfer to the surface. The smoothness of the top of the convex portion of the pattern 2 is the maximum surface roughness (JIS-B-061).
0) Rmax = 1 mm or less is preferable, and in particular, center line surface roughness (JIS-B-0610) Ra.
= 7 μm or less is preferable.

As the pattern 2 composed of the convex portions, other than the pattern 2 formed separately from the printing object 1 as shown in FIG. 1, as shown in FIG. It may be formed (FIG. 3 (a)), or a sheet-like object which is separate from the printing target 1 and has a pattern of convex portions on the surface of the printing target 1 is the projection. It may be a state in which the parts are laminated so that the parts are on the front surface side ((b) in the figure).

The pattern 2 consisting of the above-mentioned convex portions is formed on the printing medium 1
For example, the following method can be used for forming on the surface of. The base material is embossed by a conventionally known method such as mechanically pressing with a mold having an uneven shape to form a pattern of convex portions on the surface of the base material (FIG. 3A). While contacting the base material with the ionizing radiation-curable resin filled in the concave portion of the roll-shaped intaglio plate, the resin interposed between the intaglio plate and the base material is cured by irradiation with ionizing radiation to bring the resin and the base material into close contact with each other, After that, the base material is peeled from the roll-shaped intaglio plate to form a pattern having a convex shape made of an ionizing radiation curable resin on the surface of the base material. Further, if necessary, the pattern formed on the surface of the base material is further irradiated with ionizing radiation to more completely cure the resin of the convex portion (JP-A-2-131175 by the present applicant). On the surface of the base material, a conventionally known foaming ink, printing ink, resin, paste or the like is printed by using a conventional printing method such as offset printing, gravure printing, silk screen printing, letterpress printing, and the layer of the above ink or the like. A pattern having a convex shape is formed. In particular, the use of the above method is preferable because it is possible to form a pattern having sharp edges and flattened tops of the projections.

The first whole solid plate A and the second whole solid plate B
Corresponds to the printing method to be applied, and is a solid printing plate used for offset printing, gravure printing, silk screen printing, letterpress printing and the like. The above-mentioned entire surface solid plates A and B can be formed by a conventionally known method. A full-color solid plate is much easier to make than a plate for pattern printing on which a pattern is formed. The full-color solid plate is not limited to the flat plate as shown in FIG. 1, and it is possible to perform rotary printing using a cylindrical plate.

The ink for forming the first ink layer 31 and the second ink layer 41 may be any ink as long as it is an ink for multicolor overprinting, and can be applied to the above-described printing method of the present invention. It can be appropriately selected according to the printing method and purpose.

When the first ink layer 31 is printed on the surface of the convex portion and the second ink layer 41 is printed on the surface of the ink layer 31, generally, the larger the distance between the convex portions of the pattern 2 is, or the pattern 2 is larger. As the height of the convex portions of the pattern becomes lower, the amount of ink applied is decreased, the viscosity of the ink is increased, or the printing pressure is decreased, so that the surface of the substrate to be printed 1 between the convex portions of the pattern 2 is reduced. Prevent the ink from transferring.

An application example of the printing method of the present invention will be described below. INDUSTRIAL APPLICABILITY The printing method of the present invention is applied in a pattern form such as a manufacturing material for a decorative material, a transfer sheet, a printed circuit component, an electrode, a projection film (screen), an EL (electroluminescent element), etc., and the printing is repeated multiple times. It can be applied to anything that is done.

The above-mentioned decorative material is, for example, a pattern layer formed by printing on a base material sheet. Specifically, it is concealed on the back surface of a colored ink pattern which is often used for instrument patterns and logo marks of light electric equipment. Overprinting white ink with the same pattern. By providing a pattern layer on the top and bottom with a transparent layer sandwiched between them, it has a depth and three-dimensional effect.
Two-color printing with a masking ink on the transparent substrate or three-color printing with front pattern printing / masking ink printing / back pattern printing makes the colors different when viewed from the front side and when viewed from the back side. , Which has a structure in which a pattern can be obtained and the other side can be seen through (see Jitsukaihei 1-68498, etc.).
Etc. Of course, it is also possible to add and mix multi-color overprinted inks to obtain a color pattern. However, even if the three primary colors are used, all of the patterns in the pattern are overprinted with the three primary colors. Cannot be played.

The transfer sheet is, for example, one formed by printing and laminating a picture layer and an adhesive layer on a base material sheet, and specifically, a peelable base material sheet / a peelable ink consisting of convex portions. It consists of a pattern / transfer layer.
(a) One consisting only of the picture layer, (b) One consisting of the picture layer / adhesive layer, (c) One consisting of the release layer / picture layer / adhesive layer, (d) Release layer / picture layer / hiding property One consisting of ink layer / adhesive layer. Etc.

Further, the printed circuit parts, electrodes, etc. are those in which a conductive ink printed layer is formed on the surface of a substrate, and the whole or a part of the conductive ink printed layer is covered with an insulating ink solid printed layer. As an insulating base material, the top of the circuit or electrode pattern is flat on a ceramic such as steatite, an inorganic material such as alumina, a synthetic resin such as polyethylene terephthalate or polyimide, or a phenol resin-impregnated laminated board. Formed as a convex pattern, then fired if necessary (when the base material is porcelain, alumina, etc.), and an insulating layer is directly printed or transferred with an insulating ink on it. Etc.

The projection film (screen) is, for example, a lenticular lens on one surface of a transparent substrate,
A fly-eye lens or the like may be formed on the back surface of the lens, a pattern of convex portions may be formed on the back surface of the lens other than the focal area of the lens, and a black stripe may be formed on the back surface pattern with black ink.

The EL (electroluminescent element) is, for example, a pattern-shaped convex portion formed on the surface of an insulating substrate, and a light-reflective conductive ink layer, an EL phosphor layer, and the like on the pattern. Examples thereof include those in which a transparent conductive ink layer and a transparent insulating ink layer are laminated in this order.

[0027]

EXAMPLES Examples of the present invention will be shown below. Example 1 A urethane-acrylate type ionizing radiation curable resin liquid filled in a pattern-shaped concave portion of a roll-shaped intaglio plate was used.
A biaxially stretched polyethylene terephthalate film (manufactured by Toray: Dia S-50) having a thickness of μm is irradiated with ultraviolet rays to cure the resin solution, and then the film and the cured resin are separated from the roll-shaped intaglio plate, A 10 μm-thick flat floral pattern made of an ionizing radiation curable resin is formed on the surface of the film, and then a white ink (Showa Ink: Chemical X) is gravure-coated using a solid printing plate A for gravure printing. By printing only on the surface of the floral pattern, and then using a solid plate B on the entire surface, a transparent ink (Chemical X made by Showa Ink) is printed only on the surface of the white ink layer, and then a solid plate C is used to make a red color. An ink (manufactured by Showa Ink: Chemical X) was printed only on the surface of the transparent ink layer to obtain a decorative material by three-color overprinting.

Example 2 50 μm of a polyester-acrylate ionizing radiation curable resin liquid filled in the circuit pattern-shaped recesses of a roll-shaped intaglio plate
A biaxially stretched polyethylene terephthalate film (manufactured by Toray: Diamond S-50) having a thickness of m is irradiated with an electron beam to cure the resin solution, and then the film and the cured resin are separated from the roll-shaped intaglio plate. A width of 100 μm and a thickness of 10 made of an ionizing radiation curable resin on the surface of the film
A circuit pattern of μm is formed, then a urethane resin-based easy-adhesion primer is printed once using a full-screen solid plate A for silk screen printing, and a full-screen solid plate B is used to print a conductive carbon ink (binder). Was continuously printed twice only on the surface of the circuit pattern by silk screen printing to form a thin line printed circuit having a low resistance and a thickness of 20 μm. Furthermore, an ultraviolet-curable urethane-acrylate resin insulating ink was silk-screen printed on the entire surface using the solid plate C and ultraviolet-cured to form an insulating layer.

Example 3 On a surface of a glass plate having a thickness of 2 mm, an unsaturated polyester UV-curable resin was formed by offset gravure printing in a stripe shape having a line width of 100 μm and a pitch of 200 μm and a flat top. To be cured by irradiating it with ultraviolet rays, and then using a solid printing plate A for offset printing, a black ink (Chemical X manufactured by Showa Ink Co., Ltd.) is continuously printed twice by gravure printing only on the surface of the resin, A glass plate having a black stripe formed on the surface was obtained.

[0030]

According to the printing method of the present invention, the ink attached to the flat entire surface solid plate A (or B) is used to form the pattern 2 consisting of convex portions.
Since the ink is transferred from the flat plate side to the top of the convex portion of the pattern 2 by contacting the top of the above convex portion, the ink does not transfer to a portion other than the top of the convex portion.
Therefore, the ink layer can be formed only on the surface of the convex portion of the pattern 2 regardless of the shape of the pattern regardless of the shape of the pattern.

[0031]

As described above, the printing method of the present invention has the following effects. In the printing method of the present invention, the ink does not transfer to portions other than the top of the pattern formed by the convex portions even when multicolor overprinting is performed using a full-color solid plate, so that the position of the print pattern formed first is 2 The printing time can be shortened because it is not necessary to register the positions of the plates after the color. Moreover, it is possible to perform overprinting accurately on the pattern without being printed out of the predetermined pattern.

Further, since the plate used for printing is a solid plate, the plate making cost and the plate making time can be greatly reduced. Moreover, as long as the convex portions are formed in a predetermined pattern, it is only necessary to have different plates for each color, and in the past, N × M plates were required to print M types of N-color printing patterns. For N + M editions (eg N =
In the case of 3, M = 100, the number of editions can be reduced as in the case where the number of editions required to be 300 editions is 103 editions.) Therefore, no space is required for storing the editions.

Further, when the printing ink layer is formed by gravure printing of a full-plate solid plate, the level of the ink printed using the plate is good because the gravure full-plate solid plate has a large amount of retained ink. Therefore, it has an effect that there is little risk of occurrence of doctor stripes, whiskers, and fine lines and chipping.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view showing a step of performing overprinting using a printing method of the present invention.

FIG. 2 is a vertical cross-sectional view of an object to be printed having a pattern on its surface, for showing the shape of the convex portion of the pattern and the positional relationship with the object to be printed.

FIG. 3 is a vertical cross-sectional view showing an aspect in which a pattern including convex portions is provided on a printing medium.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Printed material 2 Pattern consisting of convex portions 31 1st ink layer 41 2nd ink layer A 1st full surface solid plate B 2nd full surface solid plate

Claims (1)

[Claims] 1. A desired pattern is provided on the surface of an object to be printed as a flat convex portion on the top surface, and printing is performed using a solid printing plate so that a printing ink layer is formed only on the top portion of the convex portion of the pattern. A printing method comprising performing a plurality of times to form a plurality of printing ink layers only on a desired pattern.