JPH08310101A - Printing method using water ink and water ink - Google Patents

Abstract

PURPOSE: To make possible the use of environmentally hygienic ink and contribute to environmental protection by supplying water ink to a dry flat plate where a non-image area is given an ink repelling substance, forming a patterned water ink layer, and transferring the patterned water ink layer to an object of printing. CONSTITUTION: When an ink fountain roller 12 in an ink fountain 11 and a call-up roller 13 turn in contact with each other, water ink is supplied to the call-up roller 13. And then when the call-up roller 13 is moved rightward, and turns in contact with the distributing roller 14, the ink is supplied to a plate 16a having an ink repelling substance in the non-image area thereof through the form roller 15. On that occasion, the ink is dried during movement from the ink fountain roller 12 to the plate 16a, fixed the ink to the ink image area by adhesion to and repellence from the plate 16a of the ink, and forms an image. Printing to a printing base is made by an ordinary offset from the plate 16a through a blanket.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a printing method using a water-based ink and a water-based ink.

[0002]

2. Description of the Related Art Conventionally, as a printing method using a water-based ink, a flexographic printing method using a letterpress and a water-based gravure printing method have been known. A lithographic printing method is known as a printing method using an oil-based ink.

[0003]

However, among the above-mentioned conventional printing methods using water-based ink, the flexographic printing method uses a relief plate made of resin, and thus it is difficult to increase the resolution. Further, the gravure printing method has a structure in which the gravure plate comes into contact with the doctor, and since the water-based ink has a low lubrication effect, abrasion of the doctor and the plate is likely to occur,
There is also a problem that the cost of the gravure version is high. On the other hand, in the printing method using the oil-based ink, a solvent odor is generated, and a means for suppressing it is required. Further, since an oil-based cleaning agent must be used for oil-based ink, there is a problem that a special means is required for treating the waste oil.

The present invention has been made in order to solve the above-mentioned problems, and contributes to environmental protection by using ink with improved environmental hygiene, and at the same time, simplifies printing conditions and cleaning. The objective is to simplify the system and make the device compact.

[0005]

In order to achieve the above object, the invention of claim 1 forms an aqueous ink into a thin film through an inking means and provides an ink-repellent substance on a non-image area. It is characterized in that it is supplied to another dry lithographic plate to form a patterned water-based ink layer, and the patterned water-based ink layer is transferred to a material to be printed. The invention of claim 2 is
The printing method using the water-based ink according to claim 1, wherein the dry lithographic plate is configured to be held by a plate cylinder via a cushion layer, and the patterned water-based ink layer is formed from the dry lithographic plate. It is characterized in that it is directly transferred to a printing material. According to a third aspect of the present invention, in the printing method using the water-based ink according to the first aspect, the patterned water-based ink layer is transferred from the dry lithographic plate to a material to be printed through a blanket cylinder. To do.
According to a fourth aspect of the present invention, in the printing method using the water-based ink according to any one of the first to third aspects, the inking means is configured to supply the water-based ink through a plurality of rollers. The viscosity of the water-based ink is increased while the water-based ink is transferred to the dry lithographic plate through the plurality of rollers. The invention of claim 5 is a printing method using the aqueous ink according to any one of claims 1 to 4, wherein the viscosity of the aqueous ink supplied to the inking means is 0.2 ps to 10 ps.
ps.

According to a sixth aspect of the present invention, in an aqueous ink containing an acrylic resin, propylene glycol, dipropylene glycol, or triethylene glycol monobutyl ether is contained alone or in a mixture thereof, and the acrylic resin is used. It is characterized in that the viscosity is lowered by reducing the content of. The invention of claim 7 provides the water-based ink according to claim 6,
The aqueous ink contains 10 to 20% by weight of the acrylic resin and 15 to 20% by weight of the propylene glycol, the dipropylene glycol, or the triethylene glycol monobutyl ether alone or in a mixture thereof. Is characterized in that.

[0007]

In the inventions of claims 1 to 5, water-based ink is used in the printing method using a dry lithographic plate. Further, the water-based ink is made into a thin film by an inking means and is thickened. Therefore, since no oily substance is used,
Generation of waste oil can be eliminated. Further, various physical properties of the ink necessary for printing can be obtained without providing a large number of rollers, and the printing apparatus can be simplified.

In the sixth and seventh aspects of the invention, since the water-based ink has a low viscosity, generation of waste oil can be eliminated. Further, the number of rollers can be reduced by applying the offset printing method.

[0009]

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a diagram showing an embodiment of a printing method according to the present invention. The ink fountain 11 is a portion in which ink is stored, and the ink source roller 1 is provided inside thereof.
2 are arranged. The calling roller 13 moves in the left-right direction in the figure to move the ink source roller 12 and the kneading roller 1.
4 is arranged so as to be able to abut. The kneading roller 14 is composed of a plurality of rollers, and the roller at the end thereof is in contact with the inking roller 15. In this, kneading roller 1
One of the four is mounted so as to be movable in the axial direction.
The inking roller 15 is in contact with the plate cylinder 16. The plate 16a attached to the plate cylinder 16 is a silicone planographic plate (dry planographic plate), for example, a waterless planographic plate manufactured by Toray Industries, Inc. The plate 16a has a photoadhesive resin layer (having a thickness of about several μm) formed on a support, and a silicone resin layer (having a thickness of about several μm) formed on the photoadhesive resin layer.

The ink used in this printing method is a water-based ink (water-based flexo ink or the like). The viscosity is about 0.2 to 10 ps, which is about 1/200 of the viscosity of the conventional oil-based ink. The composition of the water-based ink is, for example, 10 to 20% by weight of ink pigment, 10 to 20% by weight of acrylic resin, and polyethylene WAX.
Is 1% by weight, IPA is 2% by weight, propylene glycol is 15 to 20% by weight, and water is 45 to 55% by weight. The content of the acrylic resin in the water-based ink according to the present invention is smaller than that of conventionally known inks, and thus the viscosity of the ink is low.

The composition of the water-based ink in the examples is 13% by weight of cyanine blue, 3% by weight of extender pigment, 18% by weight of acrylic resin, 1% by weight of WAX and 2% of IPA.
Wt%, propylene glycol 19 wt%, water 44
It was set to% by weight. At this time, the viscosity is 2 ps and the surface tension is 3
It was 2 dyn / cm, and the flash point was 70 ° or higher (becomes non-hazardous material). In addition, when there are many ink pigments, an anti-wrapping agent is mixed. Also, instead of propylene glycol,
Dipropylene glycol, triethylene glycol monobutyl ether may also be used.

In the above printing method, when the ink source roller 12 and the calling roller 13 are rotated in contact with each other, ink is supplied to the calling roller 13. A small amount of ink is supplied to the calling roller 13. next,
When the calling roller 13 is moved to the right in FIG. 1, the calling roller 13 and the kneading roller 14 contact each other and rotate in this state, the ink passes through the kneading roller 14 and the inking roller 15 and reaches the plate 16a. Supplied. Further, one of the kneading rollers 14 reciprocates in the axial direction to prevent ink supply unevenness and ghost. The ink is naturally dried while being supplied from the ink source roller 12 to the plate 16a, and various physical properties of the ink are changed. That is, as the viscosity of the ink increases, the ink cohesive force and the like change. As a result, the ink has a viscosity suitable for printing, and due to the adhesion and repulsion between the plate 16a and the ink, the ink can be attached to the image area to form an image. Here, the water-based ink is naturally dried because the amount of ink supplied to the roller is extremely small and a thin film is formed on the roller.

Printing on the printing substrate can be carried out by using an ordinary offset method from the plate 16a via a blanket, as in the conventional example. Also, the plate 16a and the plate cylinder 16
Printing may be performed by providing a cushion layer between and.

The present invention can be variously modified within an equivalent range. For example, as the ink supply system, besides the system shown in the embodiment, it is also possible to use a finisher bank system or an anilox roller system. Also,
The total number of rollers is not limited to the number in the embodiment, and can be further reduced.

[0015]

According to the inventions of claims 1 to 5, since no oily substance is used, generation of waste oil can be eliminated and environmental hygiene can be improved. In addition, printing can be performed without providing a large number of rollers, so that the printing conditions can be simplified, cleaning can be simplified, and the apparatus can be made compact.
According to the inventions of claims 6 and 7, by using this water-based ink, it is not necessary to use an oil-based cleaning agent, so that generation of waste oil can be eliminated. Further, it is possible to reduce the number of rollers in the printing apparatus, simplify printing conditions, simplify cleaning, and downsize the apparatus.

[Brief description of drawings]

FIG. 1 is a diagram showing an embodiment of a printing method according to the present invention.

[Explanation of symbols]

 11 Ink fountain 12 Ink source roller 13 Calling roller 14 Mixing roller 15 Inking roller 16 Plate cylinder 16a Plate

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Masato Sakakibara 1-1-1 Ichigaya-Kagacho, Shinjuku-ku, Tokyo Dai Nippon Printing Co., Ltd.

Claims (7)

[Claims] 1. A water-based ink is formed into a thin film through an inking means and is supplied to a dry lithographic plate provided with an ink-repellent substance in a non-image area to form a patterned water-based ink layer, and the pattern is formed. A method for printing using a water-based ink, which comprises transferring the formed water-based ink layer to a material to be printed. 2. A printing method using the water-based ink according to claim 1, wherein the dry lithographic plate is configured to be held by a plate cylinder via a cushion layer, and the patterned water-based ink layer is formed. A printing method using a water-based ink, which comprises directly transferring from the dry lithographic plate to a printing material. 3. The printing method using the water-based ink according to claim 1, wherein the patterned water-based ink layer is transferred from the dry lithographic plate to a material to be printed through a blanket cylinder. Printing method using ink. 4. The printing method using the water-based ink according to claim 1, wherein the inking means is configured to supply the water-based ink via a plurality of rollers. A printing method using a water-based ink, wherein the viscosity of the water-based ink is increased while the water-based ink is transferred to the dry lithographic plate through the plurality of rollers. 5. The printing method using the water-based ink according to claim 1, wherein the viscosity of the water-based ink supplied to the inking means is 0.2 ps to 10 ps. A printing method using a characteristic water-based ink. 6. A water-based ink containing an acrylic resin, which contains propylene glycol, dipropylene glycol, or triethylene glycol monobutyl ether alone or in a mixture thereof, while reducing the content of the acrylic resin. A water-based ink characterized in that the viscosity is reduced by doing so. 7. The water-based ink according to claim 6, wherein the water-based ink contains 10 to 20% by weight of the acrylic resin, the propylene glycol, the dipropylene glycol, or the triethylene glycol monobutyl ether alone. Alternatively, an aqueous ink containing 15 to 20% by weight of a mixture thereof.