JPH08267887A - Manufacture of penetration stamp - Google Patents

Abstract

PURPOSE: To obtain a manufacturing method for a penetration stamp having open cell, simple in process and a device for manufacturing, and provide a penetration stamp capable of obtaining fresh and clear image and excellent in handling convenience. CONSTITUTION: A heat generating and melting substance 5, obtained by applying a hot melt substance 5, generating heat by the projection of infrared rays and molten at a temperature higher than the temperature of a stamp material, on an infrared rays penetratable film by the thickness of 0.5-10μm, is superposed on the surface of a stamp material S7, made of an elastic resin having a stamp ink impregnatable open cell, so that the hot melt substance 5 is contacted with the surface of the stamp material S7, then, a desired image copy L is superposed thereon while coating a liquid substance so as to obtain a mirror image. Then, a flash of light, including infrared rays, is projected from the upper part of the copy L under a condition that the stamp material S7 is compressed by 5-70% whereby the hot melt substance 5 on a part corresponding to a part B on the image copy L, on which the copy image is not existing, is heated and molten while the hot melt substance, generating heat in such a manner, as is impregnated into the stamp material and the surface layer of the stamp material S7 is molten thereby forming an impregnated and molten part H, in which the open cell is blocked.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a method for producing a permeation printing plate. More specifically, the present invention relates to an improvement in a method for producing a permeation printing plate made of a sponge material having open cells that can repeat printing without replenishing the stap ink for a long time by impregnating the stamp material with the stamp ink in advance.

[0002]

2. Description of the Related Art A stamp is known in which a sponge rubber having open cells is used as a printing material in order to save the time and effort of adhering the stamp ink to the printing surface each time a stamp or stamp is imprinted, and the stap ink is absorbed therein in advance. .
As a method for producing the stamp, JP-A-60-193686
Japanese Patent Publication discloses a method for producing a stamp in which the entire surface of the sponge except for the portion where the imprint is formed is depressed by heat embossing and pressed, and the convex portion is used as the stamp ink storage portion and the imprint forming portion. Japanese Patent Application Laid-Open No. 50-1553
No. 23 also discloses a method of pressing a porous body on a similar heating plate. However, these methods require a die as a heating plate and a labor for engraving or etching letters, symbols, figures and the like on the die.

Further, Japanese Patent Laid-Open No. 57-136652,
In JP-A-49-7003, a photopolymerizable liquid resin is applied to the surface of a stamp material, a positive film is placed on the upper surface of the stamp material, and ultraviolet rays are irradiated from above to cause a photopolymerization reaction.
A method for producing a printing plate is disclosed in which unreacted resin is removed by washing, and the removed portion is exposed on the surface of the stamp material. Further, Japanese Utility Model Publication No. 52-71710 discloses a similar method using a negative film. A lithographic stamp is disclosed. However, these methods are used to make negative or positive films,
Processes such as resin coating, photopolymerization, and water washing are complicated, and a manufacturing method capable of rapidly providing a desired stamp is desired.
That is, it is desired to provide a printing plate manufacturing method that enables plate making with a small flash irradiation energy and has a simple process. In addition, JP-A-3-96
383 discloses the following. “A stencil sheet that has been prepressed is polymerized and adhered to the surface of the porous material, and a clogging resin as a means for preventing the passage of stamp ink is placed on the surface of the stencil sheet and printed with a squeegee. After passing through the image opening, the surface of the porous material is impregnated with a shape corresponding to the image opening, and the pores in that area are clogged.After the resin for clogging is cured, the entire porous material is impregnated with the stamp ink. It is possible to use it as a stamp. "As described above, the conventional method for producing a permeation printing plate having open cells does not take a lot of time and a clear imprint cannot be obtained, and a desired stamp with a clear imprint can be obtained. A production method that can be provided promptly is desired.

[0004]

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems, and a method of manufacturing a permeation printing plate having continuous cells with a simple manufacturing process and apparatus, and a clearer impression. The object is to provide a penetrating printing plate that is obtained and is easy to use.

[0005]

The inventors of the present invention have conducted extensive studies in order to achieve the above-mentioned object, and as a result, heat generated by irradiation of infrared rays and applied with a heat-melting substance capable of penetrating a stamp material is applied. Using a fused sheet, irradiating infrared rays while pressing the stamp material, applying a liquid substance containing water to the imprint original, and the like, have led to the completion of the method for producing the permeation printing plate of the present invention. It was

That is, the method for producing the penetrating printing plate of the present invention is as follows:
The surface of a stamp material made of an elastic resin having open cells that can be impregnated with the stamp ink is heated to a temperature above the melting temperature of the stamp material by being heated by the irradiation of infrared rays to form a heat-meltable substance in an infrared permeable film. A heat-melting sheet applied to a thickness of 10 μm is overlaid so that the heat-fusible substance is in contact with the surface of the stamp material, and a desired imprint original document is overlaid thereon so as to form a mirror image. By irradiating a flash containing infrared rays from above the original in a compressed state, the original image absent portion of the imprint original passes through the infrared rays and reaches the heat-melting sheet. The infrared rays correspond to the original image absent portion. The heat-fusible substance is melted by heat, and the heat-melted substance that has generated heat permeates the stamp material and also melts the surface layer of the stamp material to block the open-cells. Non-bleeding area), while the original image portion of the imprint original blocks or absorbs infrared rays, and the corresponding heat-melting material in the heat-melting sheet portion does not heat-melt and does not melt in the corresponding stamp material. It is characterized in that a non-melting portion (stamp ink exuding portion) is formed without causing air bubbles to be blocked on the surface, and the permeation-melting portion is a recess of 0.01 mm or more with respect to the non-melting portion of the stamp material. The stamp material used has a melting temperature of 50 to 150 ° C. and has fine continuous pores having an average pore diameter of 2 to 10 μ having a three-dimensional network structure and a porosity of 30.
~ 80% of polyolefin foam 0.5 ~ 30mm
A thick sheet is preferable, and the exothermic melting sheet contains at least carbon or a polymer material and has a melting temperature of 50 to 200.
It is preferable to apply a heat-meltable substance having a melt viscosity of 50 to 2000 mPa · s at a temperature of ℃ to an infrared ray permeable sheet. Furthermore, it is preferable to apply a liquid substance to the imprint original.

The permeation printing plate of the present invention comprises a stamp ink impregnated portion made of an elastic resin stamp material having open cells capable of impregnating the stamp ink, a stamp ink exudation portion formed on the stamp material surface and the ink exudation. Portion having a stamp ink non-bleeding portion in which a recessed portion of 0.01 mm or more is formed, and the stamp ink non-bleeding portion is a mixture of a heat-melting substance-permeating portion and a stamp material-melting portion. It is characterized by comprising a mixing section and a stamp material melting section. Preferably, the stamp material has a melting temperature of 50 to 150 ° C., an average pore diameter of 2 to 10 μm, and a porosity of 30.
It is composed of a polyolefin foam sheet having a thickness of -80% and a thickness of 0.5 to 30 mm. Also, the stamp material is 5 to 50 in length.
It is preferable that the width is 0 mm and the width is 5 to 200 mm.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION The stamp material having open cells capable of being impregnated with a stamp ink used in the method for producing a printing plate of the present invention may be any material as long as it is a continuous pore body having excellent stap ink self-holding ability. For example, natural rubber, synthetic rubber-based sponge rubber, synthetic resin foam, and the like are shown, but preferably, they have fine continuous pores having an average pore diameter of 2 to 10 μm and a melting temperature of 50 to 150 ° C. 80
%, A 0.5 to 30 mm thick (more preferably 0.5 to 10 mm thick) sheet of polyolefinic foam is used.

The irradiation of flash light containing infrared rays in the manufacturing method of the present invention uses flash light using a xenon flash device, a photostrobe flash, a flash bulb or the like as a light source.

The heat-melting sheet in the production method of the present invention comprises a film capable of transmitting infrared rays, coated with a heat-meltable resin liquid containing carbon or a polymer substance which generates at least heat by irradiation of infrared rays, and heat generated by infrared rays. The film is a hot-melt or hot-melt or organic solvent solution of a hot-melt material solution applied to a film. Specifically, a hot-melt substance composed of wax, resin and carbon black is hot-melt coated on an acetate film to a thickness of 0.5 to 10 μm. The heat-fusible substance has a melting point of 50 to 160 ° C., which is higher than the melting temperature of the stamp material, and is mixed so that its melt viscosity is 50 to 2000 mPa · s.

The thickness of the heat-fusible substance of the heat-melting sheet used in the present invention is 0.5 to 10 μm, preferably 2 to 5 μm, more preferably 4 to 5 μm. The thickness of the heat-fusible substance of the heat-melting sheet is an important factor for the infrared irradiation conditions. If the thickness is too thick, not only excessive flash irradiation energy is required, but also the molten heat-melting substance cannot penetrate into the bubbles of the stamp material and the surface of the stamp material becomes uneven, and the bubbles do not clog. The gap with the fusion zone is reversed and the printing plate cannot be imprinted. On the other hand, if it is too thick, the coating is difficult and the heat-fusible substance easily peels off from the film, resulting in poor handling. As a film capable of transmitting infrared rays, an acetate film having a high infrared transmittance is preferable. The thinner the thickness, the better the efficiency of flash irradiation energy, but after flash irradiation, the film and stamp material are intercalated by a heat-meltable substance. Since it is adhered, it must be peeled off. At this time, a thickness of 10 μm or more is preferable so that the film is not damaged.

The imprint original used in the manufacturing method of the present invention is best prepared by cutting out a sheet which does not generate heat by cutting off infrared rays into an image of the imprint original, and second best is a transparent film which does not generate heat due to infrared rays and has good transmission efficiency. An image is formed with a recording material such as ink or toner that does not transmit infrared rays to the above and does not generate heat. That is, characters, symbols, figures, etc. are represented by recording materials on paper, film, etc., but paper, film has high infrared transmittance, and characters, symbols,
In principle, it is preferable that the lines such as figures are drawn with a recording material that reflects infrared rays. In the production method of the present invention,
In order to produce the best imprint document, it is preferable to use a standard imprint document produced by a PPC copier. Current,
Since the PPC copier can be freely used in companies, schools, convenience stores, etc., even general users who have many restrictions can easily produce imprint manuscripts without failure.

The imprint original using this PPC copying machine is
A desired original document is copied by a PPC copying machine and characters, symbols, figures, etc. are drawn with toner. The problematic difference in performance due to the infrared absorptivity is not found in various commercially available toners, but is present in papers of varying thickness depending on the copying machine. Therefore, by applying a liquid substance to the imprint original produced by copying on a PPC copying paper with a PPC copying machine, the infrared transmittance of the PPC copying paper is increased and the variation in the thickness of the paper is absorbed to obtain a substantially uniform infrared. Can be a transmittance of This method is not limited to copy originals, and can be similarly applied to originals written on a similar sheet with writing instruments such as pencils and felt-tip pens, or originals output by a printer. As the liquid substance, a liquid obtained by adding 20 to 50% of alcohols to water is shown. Here, alcohols are auxiliary agents for facilitating the permeation of water into the paper, and are not limited to alcohols, and even water alone takes a long time to permeate, and the effect does not change. Here, the liquid applied to the imprint original is not limited to water, but shows the same performance as long as it penetrates the paper and has a thermal conductivity equivalent to that of water, and if it is not the reproducibility of fine lines. However, even if the liquid is water, even if the original image has heat, it is difficult for that heat to be transferred to the heat-melting sheet, resulting in a clear imprint. Is obtained). Liquid substance is PPC
It is used for copy paper, original paper, etc. to increase the infrared transparency (transparency) of the paper itself and to suppress heat generation of the recording material.

In the permeation printing plate of the present invention, for example, a heat-melting sheet having a thickness of 0.5 to 10 μm of a heat-melting substance is superposed on the surface of a stamp material so that the surface of the heat-melting substance is in contact with the sheet.
A stamp imprint original coated with a liquid substance containing at least water is superposed thereon so as to form a mirror image, and the stamp material is 5 to 70%.
When a flash light containing infrared rays is irradiated from above the original in a compressed state (that is, in a state where the thickness of the stamp material is 95 to 30%), the permeation fusion portion (stamp ink non-exudation portion)
And a non-melting portion (stamp ink exuding portion) are formed. In the portion of the imprint document other than the image of the imprint document, infrared rays pass through the imprint document and reach the heat-melting sheet to generate heat and melt the heat-meltable substance. Since the melting temperature of the heat-meltable substance is equal to or higher than the melting temperature of the stamp material, the heat-meltable substance can penetrate into the surface layer of the stamp material and the heat of the heat-meltable substance can melt the surface layer of the stamp material. By compressing the material, the bubbles are compressed, and the surface layer of the stamp material is melted, and the blockage of the bubbles is strengthened. By this compression, the irradiation energy of flash light can be reduced.

The permeation fusion portion (stamp ink non-exudation portion) of the present invention is characterized in that it has a permeation fusion mixture portion in which the heat-fusible substance permeation portion and the stamp material fusion portion coexist. When only the heat-fusible substance portion does not have the heat-fusible substance-penetrating portion and the stamp material-melting portion, it is necessary to increase the film thickness of the heat-fusible substance portion, and therefore, flash light irradiation energy is required as compared with the method of the present invention. It is uneconomical. That is, the present invention is not only economical because it forms the non-bleeding portion of the stamp ink with a small amount of flash irradiation energy, but also the thermal influence on one stamp ink bleeding portion is reduced, so that it is possible to reproduce a fine imprint original image. And a clear imprint is obtained. Since the melting temperature of the heat-fusible substance is higher than the melting temperature of the stamp material, compressing the stamp material and irradiating it with a flash of light causes the stamp material itself to come into a close contact state with no bubbles and melts, thus blocking multiple layers of bubbles. To form an infiltration-melt mixing section. Therefore, when the stamp ink non-bleeding portion is formed only by the heat-meltable substance portion, it is necessary to increase the film thickness of the heat-meltable substance of the heat-melting sheet. Even if it is thin, the performance as a stamp ink non-bleeding portion can be obtained, so that the flash irradiation energy can be reduced.

If the surface of the stamp material has a high degree of smoothness, the above-mentioned compression can be reduced, the flash irradiation energy can be reduced, and an excellent imprint can be obtained. The stamp material used in the present invention has a pore size of 2 to 10 μm, preferably 3 to 5 μm. If the pore diameter is large, a large flash light irradiation energy is required to close the pores, which has the adverse effect of closing the pores in unnecessary portions. On the other hand, if the pore diameter is small, it is difficult to adjust the irradiation energy because even if the flash irradiation energy is slightly increased, unnecessary pores are blocked.
The difference between the permeation-melting portion and the non-melting portion of the printing plate obtained by compressing the above stamp material by about 5 to 70% by the above method is 0.0.
It is 1 mm or more, preferably 0.05 mm to 0.1 mm. In the present invention, for example, when a stamp material (30 mm × 50 mm × 1.6 mm) having a pore diameter of about 3 μ is prepared so that the difference between the permeation-melted portion and the non-melted portion is about 0.01 mm, the viscosity is A stamp ink of about 1000 mPa · s can be filled in about 2 grams, and a stamp with a long life can be obtained without causing stains on the paper surface at the non-bleeding portion during printing. However, in the absence of this heat-meltable substance, when the plate is made with the same energy as described above to about 0.01 mm or less, the stamp ink can maintain only about 0.2 g.

The permeation printing plate obtained by the manufacturing method of the present invention has an advantage that it can function as a stamp even if it is not assembled with other members, but it can be made into a normal stamp by mounting the printing plate on a rootstock. You can For its use, a stamp can be impregnated with the stamp ink in advance or occluded with the stamp ink so that a clear impression can be imprinted repeatedly without replenishing the stamp ink for a long time. The stamp ink stored by the stamp is not volatile at room temperature and has a viscosity of 1
Those having a printing capacity of 00 to 3,500 mPa · s exhibit preferable marking performance. In particular, 500 to 1,500 mPa · s stamp ink is preferable because it is easy to fill the printing material and the amount of the stap ink bleeds at the time of printing.

Further, by providing a stamp ink occlusion body having a foaming degree higher than that of the stamp material of the printing plate between the printing plate and the stock, it is possible to extend the life of printing and to easily replenish the stamp ink. Further, the permeation printing plate of the present invention can be continuously printed by mounting it on the surface of a roll and rotating the roll.

[0019]

Embodiments of the present invention will be described below with reference to the drawings. Preparation of Imprint Original: A printed matter was copied by a PPC copying machine to prepare an imprint original M3 having an imprint original image L. Production of a printing plate: The imprinting document image L of the imprinting document M3 is superposed on the transparent glass plate 2 of the xenon flash light emitting device 1 having an emission energy of 50 joules so as to be a normal image, and the imprinting document M is printed.
3 is coated with a liquid substance (50% by volume of ethialcohol aqueous solution), a heat-melting substance surface 5 is further faced upward, and a heat-melting sheet 4 is superposed thereon. 60%, melting temperature is about 70 ℃
The stamp material (foamed polyethylene sheet) S7 having a thickness of 1.6 mm is stacked and placed [see FIG. 1 (a)]. The heat-melting sheet 4 used here is composed of a heat-melting substance 5 (having a melting temperature of 80 ° C. and a melt viscosity of 100 mPa · S) made of wax, resin and carbon black, which is an acetate film 6.
(Thickness 20 μm) applied to a thickness of 3 μm was used. The lower the viscosity of the heat-fusible substance, the easier it is to penetrate,
Preferred, but difficult to apply to acetate film
A good balance of coating and penetration was obtained at mPa · S level. Next, the stamp material S7 is elastically deformed by 50 in the thickness direction.
Flash light was applied while pressure was applied so as to give about%. As shown in FIG. 1B, when the heat-melting sheet 4 having a heat-melting substance is used, the surface of the stamp material S7 corresponding to the imprint original image L of the imprint original M3 has a non-melting portion I.
The other surface remains as a mirror image, and the other surface serves as the permeation fusion portion H due to the heat generated by the heat-fusible substance and the stamp material sheet S7.
While the heat-melting substance melts the stamp material as well as the surface of the, the air bubbles are blocked, and the bubbles are more strongly blocked by the penetration of the heat-melting substance. (Refer to FIG. 2) Since the stamp material is compressed, the air bubbles are compressed, and the heat-melting substance permeates the surface of the stamp material sheet in a state where the stamp material itself is in close contact, and at the same time, the heat generation causes the continuous bubbles of a plurality of layers to be formed. Melt and block. When the thickness of the heat-melting substance 5 of the heat-melting sheet 4 was 2 to 5 μ, the energy efficiency of flash irradiation was high and the imprint of the seal was clear. But,
Even if the thickness is about 0.5 μm, the labor saving effect of the flash irradiation energy is recognized as compared with the case where the heat-melting substance 5 applied to the heat-melting sheet 4 is not the heat-melting substance 5. On the other hand, plate making is possible even if the thickness is about 10μ,
A large amount of flash irradiation energy is required, and further compression of the stamp material is required to provide a step on the printing surface.

[0020]

EFFECTS OF THE INVENTION The method for producing a permeation printing plate of the present invention has a simple process and does not require a mold, and therefore a high-quality stamp suitable for the purpose can be promptly provided. By applying a liquid containing water to the imprint original, the infrared transmission efficiency is improved, and a stable permeation printing plate can be obtained even if the thickness of the imprint original varies. In addition, when the stamp material is compressed during flash light irradiation, not only the heat-melting substance penetrates but also the stamp material melts by compressing the bubbles of the stamp material. Since the stamp ink non-bleeding portion) is formed, a clear imprint can be obtained.

[Brief description of drawings]

FIG. 1 is a schematic diagram of the production of a stamp printing plate, wherein (a) is a diagram schematically showing a state of a heat-melting sheet and a stamp material before irradiation with flash light and (b) after irradiation.

[FIG. 2] Stamp ink non-bleeding portion (penetration fusion portion) [consisting of a penetration fusion mixing portion (a portion in which a heat-fusible substance permeation portion and a stamp material fusion portion coexist) and a stamp material fusion portion]
FIG. 3 is an enlarged cross-sectional view of a stamp ink bleeding portion (non-melting portion).

[Explanation of symbols]

1 Flash emission part 2 Glass plate M3 Imprint manuscript 4 Heat-melting sheet 5 Heat-melting substance 6 Acetate film S7 Stamping material (foam polyethylene sheet) L Imprinting manuscript image B Imprinting manuscript image absent part 11 Penetrating fusion mixing part (heat-melting substance Mixing of permeation part and stamp material fusion part) 12 Stamp material fusion part H Permeation fusion part (stamp ink non-exudation part) I Non-fusion part (stamp ink exudation part)

Claims (6)

[Claims] 1. A film capable of transmitting infrared rays through a surface of a stamp material made of an elastic resin having open cells which can be impregnated with the stamp ink, and a heat-melting substance which is heated by irradiation of infrared rays and melts at a temperature higher than the temperature of the stamp material. A heat-melting sheet applied in a thickness of 0.5 to 10 μm on the stamp material so that the heat-melting material is in contact with the surface of the stamp material, and a desired imprint original is mirror-imaged on the stamp material. 5 to 7
By irradiating flash light containing infrared rays from above the original in a state of 0% compression, the original image absent portion of the imprint original passes through the infrared rays and reaches the heat-melting sheet. The infrared rays correspond to the original image absent portion. The part of the heat-meltable substance is melted by heat, and the heat-meltable substance permeates the stamp material and melts the surface layer of the stamp material to form a permeation-melting part (stamp ink non-exuding part) in which continuous bubbles are blocked, On the other hand, the original image portion of the imprinted original cuts off or absorbs infrared rays, and the corresponding heat-melting substance in the heat-melting sheet portion does not heat-melt and does not reach the blockage of bubbles on the surface of the corresponding stamp material and does not melt. Part (stamp ink exuding part) is formed, and the permeation-melting part is a recess of 0.01 mm or more with respect to the non-melting part of the stamp material. 2. The stamp material has a melting temperature of 50 to 150.
It is a 0.5 to 30 mm-thick sheet of polyolefin foam having a solid network structure and fine continuous pores having an average pore diameter of 2 to 10 μm and a porosity of 30 to 80%. It contains a molecular substance and has a melting temperature of 50 to 200 ° C. and a melt viscosity of 50 to 2000.
The method for producing a permeation printing plate according to claim 1, wherein the sheet is a sheet which is permeable to infrared rays and which has a heat-melting substance of mPa · s. 3. The method for producing a permeation printing plate according to claim 1, which comprises applying a liquid substance to the imprint original. 4. A stamp ink impregnated portion made of an elastic resin stamp material having open cells capable of impregnating the stamp ink, a stamp ink exudation portion formed on the surface of the stamp material, and 0.01 mm or more from the ink exudation portion. Of the stamp ink non-bleeding portion formed with the concave portion of the stamp ink, and the stamp ink non-bleeding portion is a mixture of the permeation-melting mixture portion and the stamp material-melting portion in which the heat-melting substance permeation portion and the stamp material-melting portion coexist. Penetration plate made of parts. 5. The stamp material has a melting temperature of 50 to 150.
The permeation printing plate according to claim 4, which is formed of a polyolefin foam sheet having a temperature of 0 ° C., an average pore diameter of 2 to 10 μm, a porosity of 30 to 80%, and a thickness of 0.5 to 30 mm. 6. A stamp material is 5 to 500 mm long and 5 to wide.
The permeation printing plate according to claim 5, which has a length of 200 mm.