JPH06127100A - Sheet for forming printing unit - Google Patents

Abstract

PURPOSE:To obtain a sheet for forming a printing unit having simple manufacturing steps and contributing to a method for manufacturing the unit without necessity of a mold. CONSTITUTION:A photosensitive layer 5 containing photosensitive substance 3 (e.g. optically polymerizable resin) and a filler 4 (e.g. metal oxide) is carried on a support 2 (e.g. polypropylene), and a protective layer 6 (e.g. polyester) is carried on the layer 5. This sheet for fanning a printing unit is used to manufacture a porous print plate in steps of much less number than that of a prior art method without using a mold, thereby coping with a multikind and small quantity production. Further, since the protective layer is provided, it has an effect of protecting a surface of the photosensitive layer against damage during preservation or handling.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a print body forming sheet.

[0002]

2. Description of the Related Art Conventionally, a porous printing material used for a stamp or the like is manufactured by the following method. First, a master block is prepared, and a silk screen for printing is prepared based on this. Next, a resist ink is printed on the aluminum plate using a silk screen and heated to print a pattern on the aluminum plate. Next, the aluminum plate on which the pattern has been baked is etched and the resist ink is removed to produce a master block having an uneven pattern. The concavo-convex pattern of this mother die is transferred by heating onto a thermoplastic resin plate to produce a rubber molding die. A rubber in which salt was kneaded was placed in this rubber molding die, and the mixture was pressure-heated and molded, and after desalting, it was dried to obtain a porous printed material. By impregnating the porous printing material with the stamp ink, it is possible to perform printing for a long period of time without using red ink or a stamp pad.

[0003]

However, the manufacturing process is very complicated, and since it is necessary to make the mold individually, the cost is increased, and it is difficult to cope with small-lot production of many kinds.

The present invention has been made in order to solve the above-mentioned problems, and provides a printed body forming sheet which has a simple manufacturing process and contributes to a printed body manufacturing method which does not require a mold. With the goal.

[0005]

In order to achieve this object, the sheet for forming a printing material of the present invention has a support on which a photosensitive layer containing a photosensitive substance and a filler is carried, and further on the photosensitive layer. A protective layer was carried on.

[0006]

In the print sheet-forming sheet of the present invention having the above-mentioned structure, the support plays a role of supporting the photosensitive layer and the protective layer, and the photosensitive substance has a property that its viscosity changes when exposed to light. Finally, the unevenness of the printed body is finally formed. The filler exists in a state of being dispersed in the photosensitive material, and plays a role of forming a large number of pores in the photosensitive layer.

The protective layer also serves to protect the surface of the photosensitive layer from scratches during storage or handling of the sheet for forming a print.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is an enlarged cross-sectional view showing the structure of the print body forming sheet of this embodiment. Printed body forming sheet 1
Has a structure in which a photosensitive layer 5 composed of a photosensitive substance 3 and a filler 4 dispersed therein is laminated on a support 2, and a protective layer 6 is further formed thereon.

FIG. 2 is a view showing the fine structure in the photosensitive layer 5. The filler 4 is connected by the photosensitive material 3 in the form of threads, and continuous pores are formed between the filler particles. ing.

As a specific example of the support 2, a highly transparent film-shaped material is preferable, and as the material, polypropylene, polyester, polystyrene, polycarbonate, ionomer, nylon, polyvinyl alcohol,
Examples thereof include polyvinyl chloride, polyvinylidene chloride, polyphenylene sulfide, polymethylpentene, acetyl cellulose, cellulose ester, polyvinyl acetal, fluororesins, polymer films such as cellophane, and thin glass.

Specific examples of the photosensitive substance 3 include a photodimerization type resin having a photosensitive group such as a cinnamic acid residue, a cinnamylidene residue, a coumarin residue, and a stilbene residue, a diazonium salt residue, a quinonediazide residue, Photodegradable resin with photosensitive groups such as azide residue, dithiocarbamate residue, and benzoin residue, photopolymerizable resin with acryloyl group, allyl group, vinyl group, epoxy group, acrylamide group, unsaturated polyester group, etc. Is optionally used, but is preferably a photopolymerizable resin. As the shape, a liquid shape or a wax shape is used.

A binder may be added to the photosensitive material 3 for use. Examples of the material used as the binder include polymers, preferably acrylic resins,
Examples thereof include olefin resins, vinyl acetate resins, vinyl chloride resins, styrene resins, polyamide resins, polyester resins, rubber resins, silicone resins, fluorine resins, petroleum resins and rosins. Also, waxes can be used.

Further, as a photopolymerization initiator for polymerizing a photosensitive substance, a known compound which is usually used may be used. Anthraquinone, 5-nitrofluorenone, and the like are used as photosensitization aids that have the effect of broadening the sensitizing wavelength range, and stabilizers and modifiers such as thermal polymerization inhibitors to improve storage stability, and relatively low molecular weights. In some cases, a diluent such as an oligomer or a monomer may be included at the same time.

The filler 4 is a particulate inorganic compound,
Organic compounds can be used. Examples of inorganic compounds include metals, metal oxides, metal nitrides, metal carbides, and the like.
Examples of organic compounds include acrylic resins, olefin resins, vinyl acetate resins, vinyl chloride resins, styrene resins, polyamide resins, polyester resins,
Rubber silicone resin, fluorine resin, petroleum resin, polymers such as rosin, waxes and the like can be used.

Specific examples of the protective layer 6 include polypropylene, polyester, polystyrene, polycarbonate,
Ionomer, nylon, polyvinyl alcohol, polyvinyl chloride, polyvinylidene chloride, polyphenylene sulfide, polymethylpentene, acetyl cellulose,
Examples thereof include cellulose ester, polyvinyl acetal, fluororesin, polymer films such as cellophane, metal foil, paper, and paper laminated with a resin material. If necessary, a thin layer using a material having poor wettability, such as a silicone resin or a fluororesin, may be formed on one or both surfaces of the protective layer.

Next, a plate making method using the printed sheet forming sheet 1 of this embodiment will be described.

First, as shown in FIG. 3, the protective layer 6 of the printed sheet 1 is peeled off. Since the surface of the protective layer 6 has poor wettability, the protective layer 6 can be easily peeled off at the interface with the photosensitive layer 5.

Next, as shown in FIG. 4, the photosensitive layer 5 of the print body forming sheet 1 is superposed on the porous base material 7 so as to face each other, and is pressed and fixed. The photosensitive layer 5 has adhesiveness and can be fixed to the porous substrate 7 by its adhesive force.

Next, as shown in FIG. 5, transmissive originals 8 are overlapped and exposed from the support 2 side by a lamp (not shown). Here, in the transparent portion of the document, the light from the lamp passes through the document and exposes the photosensitive layer 5. The exposed portion 9 of the photosensitive layer 5 that has been exposed increases the hardness of the photosensitive substance 3 due to a photocuring reaction and increases the force for holding the filler 4 together, and at the same time, dissolves in a specific solvent such as alkaline water or alcohol. Hard to do. On the other hand, in the opaque portion of the original, the light from the lamp does not pass through, and in the non-exposed portion 10 of the corresponding photosensitive layer 5 which is not exposed, the photo-curing reaction does not occur.
There is no increase in the ability to bind the syrup, and there is no change in the solubility in a specific solvent such as alkaline water or alcohol.

Thereafter, as shown in FIG. 6, the support 2 is peeled off, and subsequently, the surface of the photosensitive layer 5 is washed with a specific solvent 11 such as alkaline water or alcohol as shown in FIG. In this step, in the exposed portion 9, the photosensitive layer 5 is cured, so the photosensitive layer 5 is not dissolved by the solvent 11. However, in the non-exposed portion 10, the photosensitive layer 5 is not cured, so the photosensitive layer 5 is not cured. Are dissolved and removed by the solvent 11, and as a result, as shown in FIG.
A printing plate 13 having a convex portion 12 having a capillary structure is formed on the porous substrate 7.

The printing plate 13 produced by the above procedure is set on the printing plate holder 14 as shown in FIG.
Ink 15 is introduced therein. The ink 15 penetrates along the continuous capillary structure formed in the convex portion 12 of the printing plate 13.

In this state, when the convex portion 12 and the print object 16 are overlapped and pressed, the ink that has penetrated into the convex portion 12 is transferred to the print object 16.

As is clear from the above description, by using the printed body forming sheet 1 of the present embodiment,
It is possible to manufacture a porous printing plate with a very small number of steps as compared with the conventional manufacturing method and without using a mold, and it is possible to cope with a large number of kinds of products in small quantities. Further, since the protective layer 6 is provided, it also has an effect of protecting the surface of the photosensitive layer 5 from being scratched during storage or handling.

It should be noted that the present invention is not limited to the above-described embodiments, and modifications can be made without departing from the spirit thereof. For example, in place of the photocurable photosensitive material, it is also possible to use a photosoftening photosensitive material that increases the solubility of the exposed portion, and the washing step is omitted to form a printing plate. It is also possible to do so.

[0026]

As is apparent from the above description,
By using the print sheet-forming sheet of the present invention, it is possible to produce a porous printing plate in a very small number of steps as compared with the conventional production method, and without using a mold, thereby producing a wide variety of products in a small amount. Can correspond to. Further, since the protective layer is provided, it also has an effect of protecting the surface of the photosensitive layer from being scratched during storage or handling.

[Brief description of drawings]

FIG. 1 is an enlarged cross-sectional view showing a structure of a print body forming sheet.

FIG. 2 is an explanatory diagram showing a fine structure in a photosensitive layer.

FIG. 3 is an explanatory diagram showing a step of peeling a protective layer from a printed body forming sheet.

FIG. 4 is an explanatory view showing a process of fixing a printed body forming sheet from which a protective layer has been peeled off to a porous substrate.

FIG. 5 is an explanatory view showing a step of exposing a printed material forming sheet fixed to a porous substrate to light.

FIG. 6 is an explanatory diagram showing a step of peeling a support.

FIG. 7 is an explanatory diagram showing a step of washing the photosensitive layer with a solvent.

FIG. 8 is an explanatory diagram showing a cross-sectional structure of a printing plate.

FIG. 9 is an explanatory view showing a state in which a printing plate is set on a printing plate holder and is imprinted.

[Explanation of symbols]

 1 Sheet for Forming Printed Body 2 Support 3 Photosensitive Material 4 Filler 5 Photosensitive Layer 6 Protective Layer

Claims (1)

[Claims] 1. A sheet for forming a printed material, comprising a support, a photosensitive layer containing a photosensitive substance and a filler, and a protective layer on the photosensitive layer.