JPH05246165A - Intaglio printing plate material - Google Patents

Abstract

PURPOSE:To enhance the quality of printed matter by providing an intaglio printing plate material excellent in gradation reproducibility or the reproducibility of the image of a highlight part. CONSTITUTION:A hydrophilic substance 12 is contained in a hydrophobic sheetlike base material 1. For example, a light absorbing material covered with a hydrophilic film or an oleophilic substance covered with a light absorbing film is contained in the hydrophobic sheetlike base material. Or, a hydrophobic layer is formed on the upper surface of a sheetlike base material at least of which the upper layer is hydrophilic or an oleophilic substance or a light absorbing material covered with an oleophilic film or the oleophilic substance covered with a light absorbing film is contained in a sheetlike base material having a property repelling an oily solution or an oleophobic layer having a property repelling an oily solution is formed on the upper surface of a sheetlike base material at least of which the upper layer is oleophilic.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plate material for forming an intaglio printing plate, and more particularly to an intaglio printing plate material capable of plate making by laser engraving.

[0002]

2. Description of the Related Art As a conventional plate material for intaglio printing such as gravure printing, a resin sheet such as polyethylene, which is a flexible and lightweight material, is used. Moreover, these resin sheets have minute pits formed by laser processing or the like.

[0003]

However, as described above, when the plate material for intaglio printing is formed from a resin sheet such as polyethylene, since the resin such as polyethylene is hydrophobic, the critical surface tension of the surface thereof is Is small. for that reason,
In the case of printing using an aqueous ink, the wettability of the aqueous ink to the intaglio printing plate material is poor, so the ink does not sufficiently enter the pits. As a result, the gradation reproducibility of the printed matter deteriorates. Particularly in the highlight portion of the image, since the pit area is small, it is difficult for the water-based ink to enter the inside of the pit. Moreover, even if the water-based ink enters the inside of the pit, the amount of the water-based ink entering the inside of the pit is not constant. For this reason, the reproducibility of the image becomes extremely poor.

As a countermeasure, there is an intaglio printing plate material formed of a material having excellent wettability. However, in this case, not only the image portion but also the non-image portion has good wettability.
As a result, since the water-based ink is also placed on the non-image area, so-called background stain is generated, and the quality of the printed matter is extremely deteriorated.

Further, resins such as polyethylene do not allow oily ink to be applied well. For this reason, when printing is performed using an intaglio printing plate material formed of a resin sheet such as polyethylene, as in the case of printing using the above-described water-based ink, oil-based ink is sufficiently contained inside the pits having a small area. Do not fit. Moreover, even if the oil-based ink enters the inside of the pit, the amount of the oil-based ink entering the inside does not become constant. For this reason, the reproducibility of the image becomes extremely poor, and the gradation reproducibility of the printed matter also becomes poor.

As a countermeasure, there is an intaglio printing plate material formed of a material having excellent wettability. However, also in this case, the wettability is improved not only in the image portion but also in the non-image portion. As a result, so-called scumming occurs as in the case of using the above water-based ink, and the quality of the printed matter is extremely deteriorated.

An object of the present invention is to provide a printing plate material for intaglio printing that enables printing with excellent quality.

[0008]

The present invention is an intaglio printing plate material made to achieve the above object. That is, a sheet-like hydrophobic substrate is internally provided with a hydrophilic substance or a light absorber wrapped with a hydrophilic film, or a hydrophilic substance wrapped with a light absorbing film. Alternatively, a hydrophobic layer is formed on the upper surface of a sheet-like base material of which at least the upper layer is hydrophilic. Alternatively, a lipophilic substance or a light absorber wrapped with a lipophilic film or a lipophilic substance wrapped with a light absorbing film is incorporated in a sheet-like base material having a property of repelling an oily solution. Alternatively, an oleophobic layer having a property of repelling an oily solution is formed on the upper surface of a base material having a sheet shape and at least an upper layer of which is lipophilic.

[0009]

The plate material for intaglio printing having the above-described structure has a hydrophobic base material in which a hydrophilic substance or a light absorber wrapped with a hydrophilic film or a hydrophilic substance wrapped with a light absorbing film is incorporated. A hydrophilic substance or a hydrophilic film is exposed on the inner wall of the pit formed on the printing plate material. As a result, when the water-based ink for printing is applied to the plate material for intaglio printing, the inside of the pit has good wettability with the water-based ink. Therefore, when the water-based ink on the surface of the intaglio printing plate material excluding the inside of the pit is removed, the water-based ink sufficiently remains inside the pit. Further, since the base material is hydrophobic, when the water-based ink is removed, it is removed without adhering to the surface of the base material.

Alternatively, if at least the upper layer has a hydrophobic layer formed on the upper surface of a hydrophilic substrate, the pits are formed in the upper layer of the hydrophilic substrate, so that the inner wall surface of the pit becomes hydrophilic. As a result, when the water-based ink for printing is applied to the plate material for intaglio printing, the inside of the pit has good wettability with the water-based ink. Therefore, when the water-based ink on the surface of the intaglio printing plate material excluding the inside of the pit is removed, the water-based ink sufficiently remains inside the pit. Further, since the surface of the intaglio printing plate material is formed of the hydrophobic layer, when the water-based ink is removed, it is removed without adhering to the surface of the hydrophobic layer.

Alternatively, the plate material for intaglio printing having the above-mentioned structure is a light absorber or a light absorbing material in which a base material having a property of repelling an oily solution (hereinafter, this property is referred to as oleophobic property) is wrapped with a lipophilic substance or a lipophilic film. Since the lipophilic substance wrapped in the film is contained internally, the lipophilic substance or the lipophilic film is exposed on the inner wall of the pit formed in the intaglio printing plate material. As a result, when the oil-based ink for printing is applied to the plate material for intaglio printing, the inside of the pit has good wettability with the oil-based ink. For this reason, when the oil-based ink on the surface of the intaglio printing plate material excluding the inside of the pit is removed, the oil-based ink is sufficiently left inside the pit. Further, since the base material is oleophobic, when the oil-based ink is removed, it is removed without adhering to the surface of the base material.

Alternatively, when at least the upper layer has an oleophobic layer formed on the upper surface of a lipophilic base material, the pit is formed on the upper layer of the lipophilic base material, so that the inner wall surface of the pit becomes lipophilic. As a result, when the oil-based ink for printing is applied to the plate material for intaglio printing, the inside of the pit has good wettability with the oil-based ink. For this reason, when the oil-based ink on the surface of the intaglio printing plate material excluding the inside of the pit is removed, the oil-based ink is sufficiently left inside the pit. Further, since the surface of the intaglio printing plate material is formed of the oleophobic layer, when the oil-based ink is removed, it is removed without adhering to the surface of the oleophobic layer.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described with reference to the schematic sectional view shown in FIG. In the drawings, a gravure printing plate material will be described as an example of the intaglio printing plate material 10. As shown in the figure, the intaglio printing plate material 10 is composed of a substrate 11 formed into a sheet shape with a hydrophobic substance, and a plurality of hydrophilic substances 12 contained in the substrate 11. The hydrophilic substance 12 is formed of fine particles. The base material 11 is formed of, for example, an ethylene vinyl acetate copolymer (hereinafter referred to as EVA) resin. The hydrophilic substance 12 is formed of, for example, polyvinyl alcohol (hereinafter referred to as PVA) resin. It should be noted that as the base material 11, a material to which a light absorber 13 for enhancing absorption of laser light when forming a pit is added is used. The light absorber 13 is made of carbon powder such as carbon black. The mixing ratio of each is, for example, 80% by weight of EVA resin, 5% by weight of PVA resin, and 15% by weight of carbon powder.

The above mixing ratio is, for example, a PVA resin weight ratio of 5% to 1 in order to form the base material 11 into a sheet.
It is set in the range of 5%, and the weight ratio of carbon powder is 15% to 2
It is set within the range of 5%. Moreover, the weight ratio of the PVA resin and the carbon powder is set to 30% or less.

Next, an example of a method of manufacturing the intaglio printing plate material 10 will be described. First, using a mixing roll, the EVA resin is kneaded with the carbon powder under a kneading condition of, for example, 100 ° C. for 10 minutes to generate a master batch containing the carbon powder. Further, similarly to the above, the EVA resin is kneaded with the granular PVA resin to produce a masterbatch containing the PVA resin. Then, the respective master batches are kneaded again under the same kneading conditions as described above so that a predetermined mixing ratio is obtained. Then, using an extruder, a mixture of the above master batches is heated to, for example, 120 ° C. to be molded into a sheet to form the intaglio printing plate material 10.

In the first embodiment, the base material 11 is made of EVA resin. However, for example, unsaturated polyester resin, epoxy resin, allyl resin, polyurethane resin, hydrocarbon resin such as polyethylene and polypropylene, polyvinyl acetate, It is also possible to use polar vinyl resins such as methyl methacrylate resin, cotton-like structural resins such as polyacetal, polycarbonate, polyethylene terephthalate, and the like.

As the hydrophilic substance 12, the above PVA is used.
In addition to the resin, it is also possible to use a polyethylene glycol (hereinafter referred to as PEG) resin or a cellulosic resin such as acetyl cellulose. Alternatively, anionic surfactants such as fatty acid soaps and alkylbenzene sulfonates, and amphoteric surfactants such as long-chain alkylamino acids can be used. The mixing ratio of these substances is
It is determined in consideration of laser processability for forming pits.

Further, carbon powder was added as the light absorber 13 to the intaglio printing plate material 10 described in the first embodiment, but the base material 11 itself is a material excellent in laser light absorption. If formed, it is not necessary to add the light absorber 13.

Next, a method of irradiating the intaglio printing plate material 10 with laser light to form pits will be described. For the laser light (not shown), for example, semiconductor laser light (wavelength is about 800 nm) is used. Laser light emitted from a semiconductor laser device (not shown) is condensed by a condensing optical system (not shown) into a predetermined mode and a predetermined spot size, and the intaglio printing plate material 10 is irradiated with the light. ..

Then, as shown in FIG. 2, the portion of the intaglio printing plate material 10 irradiated with laser light (not shown) is heated and evaporated. Then, a pit 15 for forming ink is formed. Usually, the diameter of the pit 15 formed by laser processing is set in the range of several μm to several tens μm, and the depth thereof is set in the range of several μm to several tens μm.

In the intaglio printing plate material 10 having the above structure, since the base material 11 is formed of the hydrophobic substance containing the hydrophilic substance 12, when the pits 15 are formed, a plurality of inner walls of the pits 15 are formed. The hydrophilic substance 12 is exposed. Therefore, the inner wall of the pit 15 has good wettability with the water-based ink.
Therefore, when the water-based ink on the surface of the intaglio printing plate material 10 is applied and then the water-based ink on the surface is removed, the water-based ink enters the pits 15 and remains sufficiently.
Further, the water-based ink is completely removed from the surface of the intaglio printing plate material 10 excluding the inside of the pits 15.

In the above-described first embodiment, the hydrophilic substance 12 may be exposed on the surface of the intaglio printing plate material 10. Therefore, it is also possible to form a thin hydrophobic film (not shown) on the surface of the intaglio printing plate material 10. This hydrophobic film is made of the same material as that of the base material 11, for example, 1 μm to
It is formed to a thickness of about 5 μm.

Next, a second embodiment will be described with reference to the schematic sectional view shown in FIG. As shown in the figure, intaglio printing plate material 20
Is a base material 21 made of a hydrophobic substance such as EVA resin.
A plurality of light absorbers (for example, carbon powder) 23 whose periphery is covered with a thin hydrophilic film (for example, PVA resin) 22 are internally included and molded into a sheet shape. The mixing ratio of each is, for example, 80% by weight of EVA resin, 5% by weight of PVA resin, and 15% by weight of carbon powder.

The above mixing ratio is, for example, a PVA resin weight ratio of 5% to 1 in order to form the base material 11 into a sheet shape.
It is set in the range of 5%, and the weight ratio of carbon powder is 15% to 2
It is set within the range of 5%. Moreover, the weight ratio of the PVA resin and the carbon powder is set to 30% or less.

Next, an example of a method of manufacturing the intaglio printing plate material 20 will be described. First, using a mixing roll, for example, under a kneading condition of 100 ° C. for 10 minutes, thin PVA is applied to the surroundings.
The resin-coated carbon powder is kneaded with EVA resin to form a masterbatch. Then, using an extruder, the masterbatch is heated to, for example, 120 ° C. to be formed into a sheet, and the intaglio printing plate material 20 is formed.

The base material 21 is made of EVA resin,
It is also possible to use the same resin as the substrate (11) described in the first embodiment. Further, as the hydrophilic film 22,
In addition to the PVA resin, it is also possible to use a film made of a resin similar to the hydrophilic substance (12) described in the first embodiment.

The method of irradiating the intaglio printing plate material 20 with laser light to form the pits for the ink during printing is the same as that described in the first embodiment, and the description thereof is omitted here. ..

The inner wall of the pit (not shown) formed in the intaglio printing plate material 20 having the above-mentioned structure by laser processing is
A plurality of hydrophilic films 22 are exposed. Therefore, the inner wall of the pit has good wettability with the water-based ink. Therefore, when the water-based ink on the surface of the intaglio printing plate material 20 is applied and then the water-based ink on the surface is removed, the water-based ink enters into the pits and remains sufficiently. Further, the water-based ink is completely removed from the surface of the intaglio printing plate material 20 excluding the inside of the pits.

In the second embodiment described above, the hydrophilic film 22 may be exposed on the surface of the intaglio printing plate material 20. Therefore, it is possible to form a thin hydrophobic film (not shown) on the surface of the intaglio printing plate material 20. This hydrophobic film is made of the same material as that of the base material 21, for example, 1 μm to 5 μm.
It is formed to a thickness of about μm.

Next, a third embodiment will be described with reference to the schematic sectional view shown in FIG. As shown in the figure, intaglio printing plate material 30
Is a base material 31 made of a hydrophobic substance such as EVA resin.
A plurality of hydrophilic substances (for example, PVA resin) 33 whose periphery is covered with a thin light absorption film (for example, carbon film) 32 are internally included and molded into a sheet shape. The mixing ratio of each is, for example, 80% by weight of EVA resin, 5% by weight of PVA resin, and 15% by weight of carbon powder.

The above mixing ratio is, for example, a PVA resin weight ratio of 5% to 1 in order to form the base material 11 into a sheet.
It is set in the range of 5%, and the weight ratio of carbon powder is 15% to 2
It is set within the range of 5%. Moreover, the weight ratio of the PVA resin and the carbon powder is set to 30% or less.

Next, an example of a method of manufacturing the intaglio printing plate material 30 will be described. First, a masterbatch is produced by kneading a plurality of granular PVA resins each having a thin carbon film on the periphery thereof with an EVA resin under a kneading condition of, for example, 100 ° C. for 10 minutes using a mixing roll. Then, using an extruder, the master batch is heated to, for example, 120 ° C. to be formed into a sheet, and the intaglio printing plate material 30 is formed.

The base material 31 is made of EVA resin.
For example, the same resin as the base material (11) described in the first embodiment can be used. Further, as the hydrophilic substance 32, in addition to the PVA resin, the same resin as the hydrophilic substance (12) described in the first embodiment can be used.

The method of irradiating the intaglio printing plate material 30 with a laser beam to form the pits for ink in printing is the same as that described in the first embodiment, and therefore the description thereof is omitted here. .. Then, as shown in FIG. 5, a portion of the intaglio printing plate material 30 irradiated with laser light (not shown) is heated and evaporated, and a pit 35 is formed. At this time, the light absorption film 32 covering the hydrophilic substance 33 easily absorbs the laser light and is removed. Therefore, the hydrophilic substance 33 from which the light absorption film 32 is removed appears on the inner wall of the pit 35. Therefore, the inner wall of the pit 35 has good wettability with the water-based ink. Therefore, when the water-based ink on the surface of the intaglio printing plate material 30 is applied and then the water-based ink on the surface is removed, the water-based ink enters the pits 35 and remains sufficiently. Further, the water-based ink is completely removed from the surface of the intaglio printing plate material 30 excluding the inside of the pits 35.

Next, as a fourth embodiment, an intaglio printing plate material having a hydrophobic layer formed on its surface will be described with reference to the schematic sectional view shown in FIG. As shown in the figure, a hydrophilic layer 42 is formed on the upper layer of the base material 41 formed into a sheet. A hydrophobic layer 43 is formed on the upper surface of the hydrophilic layer 42. The intaglio printing plate material 40 is configured as described above. In the intaglio printing plate material 40, the base material 41 itself may be formed of a hydrophilic substance instead of forming the hydrophilic layer 42. Alternatively, the upper layer of the base material 41 may be made hydrophilic.

The base material 41 is made of EVA resin, for example. The hydrophilic layer 42 is formed of, for example, a polyvinyl alcohol (hereinafter referred to as PVA) resin having a thickness of about 30 μm. The film thickness of the hydrophilic layer 42 may be deeper than the depth of the pits formed in the intaglio printing plate material 40. The hydrophobic layer 43 is formed of, for example, a fluororesin having a thickness of about 1 μm to 5 μm and having excellent wear resistance. It is desirable that the film thickness of the hydrophobic layer 43 be as thin as possible if abrasion resistance is secured.

The hydrophobic layer 43 or the hydrophilic layer 42 is also used.
A light absorber (not shown) is usually added to either one or both of them to enhance absorption of laser light when forming a pit. The light absorber is made of carbon powder such as carbon black. The addition amount of the light absorber is set to, for example, 30% or less by weight.

Next, an example of a method of manufacturing the intaglio printing plate material 40 will be described. First, for example, a PVA solution in which carbon powder (not shown) as a light absorber is dispersed by 10% by weight is applied to the upper surface of the base material 41 formed into a sheet. Then, it is dried to form the hydrophilic layer 42 having a thickness of about 30 μm. Next, a fluororesin having a thickness of, for example, about 3 μm is formed as a hydrophobic layer 43 on the upper surface of the hydrophilic layer 42. As a film forming method of the fluororesin, for example, the base material 41
After applying perfluorokerosene to the product, plasma treatment is performed to obtain a solidified thin film of fluororesin.

When carbon powder was added as a light absorber to the intaglio printing plate material 40 described in the fourth embodiment, but at least the hydrophobic layer 43 itself has excellent laser light absorption. Alternatively, when the hydrophobic layer 43 has excellent laser beam transmission and the hydrophilic layer 42 itself has excellent laser beam absorption, it is not necessary to add a light absorber.

Although the base material 41 is made of EVA resin,
It can also be formed of other resins. In addition to the PVA resin, the hydrophilic layer 42 may be made of the same material as the hydrophilic substance (12) described in the first embodiment. In addition to the fluororesin, the hydrophobic layer 43 may be made of the same material as the base material (11) described in the first embodiment.

Next, the pits formed by irradiating the intaglio printing plate material 40 with laser light will be described with reference to FIG. For the laser light (not shown), for example, semiconductor laser light (wavelength is about 800 nm) is used. A laser beam oscillated by a semiconductor laser device (not shown) is condensed by a condensing optical system (not shown) into a predetermined mode and a predetermined spot size, and then the intaglio printing plate material 40 described above is formed. Irradiate.

The portion of the intaglio printing plate material 40 irradiated with laser light is heated and evaporated. Then, a pit 45 that penetrates the hydrophobic layer 43 and reaches the hydrophilic layer 42 is formed. Usually, the diameter of the pit 45 formed by laser processing is several μm to several tens of μm, and the depth thereof is several μm.
To tens of μm.

In the intaglio printing plate material 40 having the above structure, most of the inner wall of the formed pit 45 is the hydrophilic layer 4.
It becomes 2. Therefore, the inner wall of the pit 45 has good wettability with the water-based ink. As a result, when the water-based ink is applied to the intaglio printing plate material 40, the water-based ink sufficiently enters the pits 45. Then, when the water-based ink on the surface of the intaglio printing plate material 40 excluding the inside of the pits 45 is removed, the water-based ink on the surface of the intaglio printing plate material 40, that is, the surface of the hydrophobic layer 43 adheres to the surface. Be removed without doing.

Next, an embodiment of an intaglio printing plate material for oil-based ink will be described with reference to FIGS. In each drawing, a gravure printing plate material will be described as an example of an intaglio printing plate material.
First, a fifth embodiment will be described with reference to the schematic sectional view shown in FIG. As shown in the figure, the intaglio printing plate 50 has a base material 51 formed into a sheet shape with a resin having a property of repelling an oily solution (hereinafter, this property is referred to as oleophobic property), and is present in the base material 51. It is composed of a plurality of lipophilic substances 52. The lipophilic substance 52 is formed of fine particles. The base material 51 is
For example, it is formed of polyethylene resin. The lipophilic substance 52 is formed of, for example, a polyethylene glycol (hereinafter referred to as PEG) resin. As the base material 51, a material to which a light absorber 53 for enhancing absorption of laser light when forming pits is added is used. This light absorber 53
Is made of carbon powder such as carbon black. The mixing ratio of each is, for example, 80% by weight of polyethylene resin, 5% by weight of PEG resin, and 15% by weight of carbon powder.

The above mixing ratio is, for example, 5% to 15% by weight of PEG resin in consideration of forming into a sheet.
%, And the weight ratio of carbon powder is 15% to 25%.
It is set in the range of%. Moreover, the weight ratio of the PEG resin and the carbon powder combined is set to, for example, 30% or less.

Next, an example of a method of manufacturing the intaglio printing plate material 50 will be described. First, using a mixing roll, the carbon powder is kneaded with the polyethylene resin under a kneading condition of, for example, 100 ° C. for 10 minutes to generate a master batch containing the carbon powder. In addition, in the same manner as above, polyethylene resin
The G resin is kneaded to produce a masterbatch containing the PEG resin. Then, the respective master batches are kneaded again under the same kneading conditions as described above so that a predetermined mixing ratio is obtained. Then, using an extruder, a mixture of the master batches is heated to, for example, 120 ° C. and molded into a sheet to form an intaglio printing plate material 50.

Although the base material 51 is formed of polyethylene resin, it is also possible to use, for example, polypropylene resin, PVA resin, chloroprene rubber, polysulfide synthetic rubber, polycapramide resin, hexamethylenediamine adipic acid resin, or the like. As the lipophilic substance 52, in addition to the PEG resin, anionic surfactant such as fatty acid soap and alkylbenzene sulfonate, or amphoteric surfactant such as long-chain alkylamino acid can be used. The mixing amount of these substances is determined in consideration of the laser processability for forming pits.

Although carbon powder was added as a light absorber to the intaglio printing plate material 50, if the base material 51 itself is made of a material having excellent laser light absorption, It is not necessary to add an absorber.

The method of irradiating the intaglio printing plate material 50 with a laser beam to form the pits for the ink during printing is the same as that described in the first embodiment, and therefore the description thereof is omitted here. ..

The inner wall of a pit (not shown) formed in the intaglio printing plate material 50 having the above-mentioned structure by laser processing is
A plurality of lipophilic substances 52 are exposed. Therefore, the inner wall of the pit has good wettability with the oil-based ink. Therefore, when the oil-based ink on the surface of the intaglio printing plate material 50 is applied and then the oil-based ink on the surface is removed, the oil-based ink enters into the pits and remains sufficiently. In addition, the oil-based ink is completely removed from the surface of the intaglio printing plate material 50 excluding the inside of the pits.

In the fifth embodiment described above, the lipophilic substance 52 may appear on the surface of the intaglio printing plate material 50. Therefore, it is possible to form a thin oleophobic film (not shown) on the surface of the intaglio printing plate material 50. This oleophobic film is made of, for example, the same material as the base material 51 and has a thickness of
It is formed to a thickness of about 5 μm.

Next, a sixth embodiment will be described with reference to the schematic sectional view shown in FIG. As shown in the figure, intaglio printing plate material 60
Is covered with a thin lipophilic film (eg, PEG resin) 62 in a base material 61 made of a substance having a property of repelling an oily solution such as polyethylene resin (hereinafter, a substance having this property is referred to as an oleophobic substance). A plurality of light absorbers (for example, carbon powder) 63 are incorporated and molded into a sheet. The respective mixing ratios are, for example, 80% by weight of polyethylene resin, 5% by weight of PEG resin, and 15% by weight of carbon powder.
And

The mixing ratio is, for example, 5% to 15% by weight of the PEG resin in consideration of forming into a sheet.
%, And the weight ratio of carbon powder is 15% to 25%.
It is set in the range of%. Moreover, the weight ratio of the PEG resin and the carbon powder combined is set to, for example, 30% or less.

Next, an example of a method of manufacturing the intaglio printing plate material 60 will be described. First, using a mixing roll, under a kneading condition of, for example, 100 ° C. for 10 minutes, thin PEG around the periphery.
Knead carbon powder covered with resin into polyethylene resin,
Generate a masterbatch. Then, using an extruder, the master batch is heated to, for example, 120 ° C. to be formed into a sheet, and the intaglio printing plate material 60 is formed.

The base material 61 is formed of polyethylene resin. For example, the base material (51) described in the fifth embodiment is used.
It is also possible to form the same material as. Further, the lipophilic film 62 can be formed of the same material as the lipophilic substance (52) described in the fifth embodiment, for example. The mixing ratio of these substances is determined in consideration of the processability of forming into a sheet.

The method of irradiating the intaglio printing plate material 60 with laser light to form the pits into which ink is applied at the time of printing is the same as that described in the first embodiment, and the description thereof is omitted here. ..

The inner wall of a pit (not shown) formed in the intaglio printing plate material 60 having the above-mentioned structure by laser processing is
A plurality of lipophilic films 62 are exposed. Therefore, the inner wall of the pit has good wettability with the oil-based ink. Therefore, when the oil-based ink on the surface of the intaglio printing plate material 60 is applied and then the oil-based ink on the surface is removed, the oil-based ink is sufficiently left inside the pits. Further, the oil-based ink is completely removed from the surface of the intaglio printing plate material 60 excluding the inside of the pits.

In the sixth embodiment described above, the lipophilic film 62 may appear on the surface of the intaglio printing plate material 60. Therefore, it is also possible to form a thin oleophobic film (not shown) on the surface of the intaglio printing plate material 60. This oleophobic film is made of the same material as that of the base material 61, for example, and is 1 μm to 5 μm.
It is formed to a thickness of about μm.

Next, a seventh embodiment will be described with reference to the schematic sectional view shown in FIG. As shown in the figure, intaglio printing plate material 7
In the case of 0, a lipophilic substance (for example, PEG resin) 73 covered with a thin light absorbing film (for example, carbon film) 72 is contained in a base material 71 made of an oleophobic substance such as polyethylene resin, and molded into a sheet shape. It was done. The mixing ratio of each is, for example, a weight ratio of 80% polyethylene resin and PE.
G resin is 5% and carbon powder is 15%.

The above mixing ratio is, for example, a PEG resin weight ratio of 5% to 15 in consideration of molding into a sheet.
%, And the weight ratio of carbon powder is 15% to 25%.
It is set in the range of%. Moreover, the total weight ratio of PEG and carbon powder is set to, for example, 30% or less.

Next, an example of a method of manufacturing the intaglio printing plate material 70 will be described. First, a master roll is produced by kneading a granular PVA resin whose periphery is covered with a thin carbon film with a polyethylene resin under a kneading condition of, for example, 100 ° C. for 10 minutes using a mixing roll. Then, using an extruder, the master batch is heated to, for example, 120 ° C. to be formed into a sheet, and the intaglio printing plate material 70 is formed.

The base material 71 is made of polyethylene resin. For example, the base material (51) described in the fifth embodiment is used.
It is also possible to form the same material as. Further, the lipophilic substance 73 can be formed of the same material as the lipophilic substance (52) described in the fifth embodiment, for example. The mixing ratio of these substances is determined in consideration of the processability of forming into a sheet.

The method of irradiating the intaglio printing plate material 70 with a laser beam to form the pits into which the ink is inserted at the time of printing is the same as that described in the first embodiment, and therefore the description thereof is omitted here. ..

The portion of the intaglio printing plate material 70 irradiated with laser light (not shown) is heated and evaporated,
Pits (not shown) are formed. At this time, the light absorption film 72 covering the lipophilic substance 73 is easy to absorb the laser light and is therefore removed. Therefore, the lipophilic substance 73 from which the light absorption film 72 is removed appears on the inner wall of the pit. Therefore, the inner wall of the pit has good wettability with the oil-based ink. Therefore, when the oil-based ink on the surface of the intaglio printing plate material 70 is applied and then the oil-based ink on the surface is removed, the oil-based ink enters into the pits and remains sufficiently. Further, the oil-based ink is completely removed from the surface of the intaglio printing plate material 70 excluding the inside of the pits.

Next, as an eighth embodiment, an intaglio printing plate material having an oleophobic layer formed on its surface will be described with reference to the schematic sectional view shown in FIG. As shown in the drawing, a lipophilic layer 82 is formed on the upper layer of the base material 81 formed into a sheet.
An oleophobic layer 83 having a property of repelling an oily solution is formed on the upper surface of the lipophilic layer 82. The intaglio printing plate material 80 is configured as described above. In the intaglio printing plate material 80, the base material 81 itself may be formed of a lipophilic substance instead of forming the lipophilic layer 82. Alternatively, the upper layer of the base material 81 may be made lipophilic.

The base material 81 is formed of polyethylene resin, for example. The lipophilic layer 82 is formed of, for example, a PEG resin having a thickness of about 30 μm. This lipophilic layer 82
The film thickness may be deeper than the depth of the pits formed in the intaglio printing plate material 80. The oleophobic layer 83 is, for example, 1 μm.
As a resin having a thickness of about m to 5 μm and excellent in wear resistance,
For example, it is formed of fluororesin. It is desirable that the thickness of the oleophobic layer 83 be as thin as possible if abrasion resistance is secured.

Further, the oleophobic layer 83 or the lipophilic layer 82.
A light absorber (not shown) is usually added to either one or both of them to enhance absorption of laser light when forming a pit. The light absorber is made of carbon powder such as carbon black. The amount of the light absorber added is set to 30% or less by weight.

Next, an example of a method of manufacturing the intaglio printing plate material 80 will be described. First, for example, a liquid PEG resin in which carbon powder (not shown) as a light absorber is dispersed by about 10% by weight is applied to the upper surface of the base material 81 formed into a sheet. Then, it is dried to form a lipophilic layer 82 having a thickness of about 30 μm. Next, on the upper surface of the lipophilic layer 82, for example, a fluororesin having a thickness of about 3 μm is formed as the oleophobic layer 83. As a film forming method of the fluororesin, for example,
By applying perfluorokerosene to the base material 81 and then performing plasma treatment, a solidified thin film of fluororesin can be obtained.

When carbon powder was added as a light absorber to the intaglio printing plate material 80 described in the eighth embodiment, but at least the oleophobic layer 83 itself is excellent in absorption of laser light. Alternatively, when the oleophobic layer 83 has excellent laser beam transmission and the lipophilic layer 82 itself has excellent laser beam absorption, it is not necessary to add a light absorber.

Although the base material 81 is made of polyethylene resin, it may be made of other resins. Further, as the lipophilic layer 82, in addition to the PEG resin, the same material as the lipophilic substance (52) described in the fifth embodiment can be used. Further, as the oleophobic layer 83, in addition to the above-mentioned fluororesin, the same material as the base material (51) described in the fifth embodiment can be used.

The method of forming the pits for irradiating the intaglio printing plate material 80 with the laser beam to enter the ink at the time of printing is the same as that described in the first embodiment, and therefore the description thereof is omitted here. By the laser processing, most of the inner wall of the pits (not shown) formed in the intaglio printing plate material 80 having the above structure becomes the lipophilic layer 82. Therefore, the inside of the pit has good wettability with the oil-based ink. Therefore, when the oil-based ink on the surface of the intaglio printing plate material 60 is applied and then the oil-based ink on the surface is removed, the oil-based ink is sufficiently left inside the pits. Further, the oil-based ink is completely removed from the surface of the intaglio printing plate material 80 excluding the inside of the pits.

[0072]

As described above, according to the inventions of claims 1 to 3, the light absorber or the hydrophilic material wrapped with the hydrophilic substance or the hydrophilic film on the hydrophobic substrate is used. Since the substance is contained therein, the hydrophilic substance or the hydrophilic film is exposed on the inner wall of the pit formed in the intaglio printing plate material.
Therefore, the inside of the pit has good wettability with the water-based ink, so that the water-based ink sufficiently remains in the pit.
In addition, the water-based ink on the surface of the substrate can be removed without leaving.
Further, in the invention of claim 4, since at least the upper layer has a hydrophobic layer formed on the upper surface of a hydrophilic substrate, most of the inner wall surface of the pit formed in the intaglio printing plate material is hydrophilic. .. As a result, sufficient water-based ink remains in the pits. Further, it can be removed without leaving the aqueous ink on the surface of the hydrophobic layer. Therefore, it is possible to print with a water-based ink having excellent image reproducibility and gradation reproducibility.

Further, the inventions of claims 5 to 7 are: a base material having a property of repelling an oily solution (oleophobicity), a light absorber covered with a lipophilic substance or a lipophilic film, or a lipophilicity covered with a light absorbing film. Since the substance is contained internally, the lipophilic substance or the lipophilic film is exposed on the inner wall of the pit formed in the intaglio printing plate material. For this reason, the wettability with respect to the oil-based ink is improved inside the pit, so that the oil-based ink sufficiently remains in the pit. Further, it can be removed without leaving the oil-based ink on the surface of the substrate. Further, in the invention of claim 8, since at least the upper layer has an oleophobic layer formed on the upper surface of the lipophilic base material, most of the inner wall surface of the pit formed in the intaglio printing plate material becomes lipophilic. .. As a result, a sufficient amount of oil-based ink remains in the pits. Further, it can be removed without leaving the oily ink on the surface of the oleophobic layer. Therefore, it is possible to print with an oil-based ink having excellent image reproducibility and gradation reproducibility.

[Brief description of drawings]

FIG. 1 is a schematic cross-sectional view of a plate material for intaglio printing according to a first embodiment.

FIG. 2 is a schematic sectional view of pits formed in the intaglio printing plate material in FIG.

FIG. 3 is a schematic sectional view of an intaglio printing plate material according to a second embodiment.

FIG. 4 is a schematic sectional view of an intaglio printing plate material according to a third embodiment.

5 is a schematic cross-sectional view of pits formed in the intaglio printing plate material in FIG.

FIG. 6 is a schematic cross-sectional view of a plate material for intaglio printing according to a fourth embodiment.

7 is a schematic cross-sectional view of pits formed in the intaglio printing plate material in FIG.

FIG. 8 is a schematic cross-sectional view of a plate material for intaglio printing according to a fifth embodiment.

FIG. 9 is a schematic sectional view of an intaglio printing plate material according to a sixth embodiment.

FIG. 10 is a schematic sectional view of an intaglio printing plate material according to a seventh embodiment.

FIG. 11 is a schematic sectional view of an intaglio printing plate material according to an eighth embodiment.

[Explanation of symbols]

10 Intaglio Printing Plate Material 11 Base Material 12 Hydrophilic Substance 13 Light Absorber 15 Pit 20 Intaglio Printing Plate Material 21 Base Material 22 Hydrophilic Film 23 Light Absorber 30 Intaglio Printing Plate Material 31 Base Material 32 Light Absorbing Film 33 Hydrophilic substance 35 Pit 40 Intaglio printing plate material 41 Base material 42 Hydrophilic layer 43 Hydrophobic layer 45 Pit 50 Intaglio printing plate material 51 Base material 52 Lipophilic substance 53 Light absorber 60 Intaglio printing plate material 61 Base material 62 lipophilic film 63 light absorber 70 intaglio printing plate material 71 base material 72 light absorbing film 73 lipophilic substance 80 intaglio printing plate material 81 base material 82 lipophilic layer 83 oleophobic layer

Claims (8)

[Claims] 1. An intaglio printing plate material for forming an intaglio printing plate, comprising: a sheet-shaped substrate made of a hydrophobic substance and a hydrophilic substance contained in the substrate. An intaglio printing plate material. 2. An intaglio printing plate material for forming an intaglio printing plate, comprising: a sheet-shaped base material made of a hydrophobic substance; and an internal part of the base material, which is wrapped with a hydrophilic film. A plate material for intaglio printing, which comprises a light absorber. 3. An intaglio printing plate material for forming an intaglio printing plate, comprising: a sheet-shaped base material made of a hydrophobic substance; and an internal part of the base material, which is wrapped with a light absorbing film. A plate material for intaglio printing, which comprises a hydrophilic substance. 4. An intaglio printing plate material for forming an intaglio printing plate, comprising a sheet-like base material having at least an upper layer formed of a hydrophilic substance, and a hydrophobic material formed on an upper surface of the base material. An intaglio printing plate material comprising a layer. 5. An intaglio printing plate material for forming an intaglio printing plate, comprising a sheet-like base material made of a substance having a property of repelling an oily solution, and a lipophilic substance existing in the base material. A plate material for intaglio printing, comprising: 6. An intaglio printing plate material for forming an intaglio printing plate, comprising: a sheet-like base material made of a substance having a property of repelling an oily solution; A plate material for intaglio printing, comprising a light absorber wrapped with a lipophilic film. 7. An intaglio printing plate material for forming an intaglio printing plate, comprising: a sheet-like base material made of a substance having a property of repelling an oily solution; An intaglio printing plate material comprising a lipophilic substance wrapped in a light absorbing film. 8. An intaglio printing plate material for forming an intaglio printing plate, comprising: a sheet-like base material having at least an upper layer having lipophilicity; and an oily solution formed on the upper surface of the base material. An intaglio printing plate material comprising an oleophobic layer made of a substance having properties.