JP3529469B2 - Manufacturing method of penetrating printing plate - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a permeation printing plate. More specifically, it relates to an improvement in a method for producing a permeation printing plate made of a sponge material having open cells that can be repeatedly printed without replenishing the ink for a long time by impregnating the stamp material with the ink in advance.

[0002]

2. Description of the Related Art A stamp is known in which sponge rubber having open cells is used as a printing material and ink is pre-absorbed in order to save the time and effort of adhering the stamp ink to the printing surface each time when printing a stamp or stamp. . As a method for manufacturing the stamp, Japanese Patent Laid-Open No. Sho 60-193686 discloses that the entire surface of the sponge except for the portion where the imprint is formed is depressed by heat embossing and pressed to solidify the convex portion, and the convex portion is the ink occlusion portion. As a method for producing a stamp to be used as an imprint forming portion, Japanese Patent Application Laid-Open No. 50-155323 discloses a method for press-bonding 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 exposed portion is exposed on the surface of the stamp material.
Further, Japanese Utility Model Application Laid-Open No. 52-71710 discloses a lithographic printing stamp by a similar method using a negative film. 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. Further, Japanese Patent Application No. 3-96383 describes that a thermal transfer film is used, but there is no specific disclosure. As mentioned above,
The conventional method for producing a permeation printing plate having open cells is troublesome, and a clear imprint cannot be obtained, and a method for producing a desired stamp having a clear imprint quickly 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. Another object of the present invention is to provide a black-and-white reversal penetration plate without requiring a special original when a black-and-white inverted imprint of the original is required.

[0005]

Means for Solving the Problems The inventors of the present invention have conducted extensive studies in order to achieve the above object, and as a result, a thermal transfer sheet coated with a heat-meltable substance that does not melt only by irradiation with infrared rays, The inventors have found that an original drawn with heat-generating ink and toner is used and that the stamp material is irradiated with infrared rays while being pressed, and thus the method for producing a permeation printing plate of the present invention has been completed.

That is, according to the method for producing a permeation printing plate of the present invention, a film of a melt transfer substance that melts at a temperature not lower than the melting temperature of the stamp material is formed on the surface of a stamp material made of an elastic resin having open cells that can be impregnated with the stamp ink. 0.5 to 10μ
A thermal transfer sheet applied to the surface of the stamp material so that the molten transfer material is in contact with the surface of the stamp material, and an original image of a black and white reverse image of a seal image drawn with a substance that generates heat with infrared rays is formed on the surface of the thermal transfer sheet. The stamp material and thermal transfer sheet are stacked so that they are mirror images.
By irradiating a flash light comprising infrared from over preparative and document surface document are stacked, substances present portion that generates heat by infrared manuscript heated by infrared, thermal portion of the transfer <br/> sheet corresponding thereto Melted transfer material is transferred to the stamp material, and the surface layer of the stamp material is closely melted to form a transfer melted part (stamp ink non-exudation part) in which continuous air bubbles are blocked. Non-transfer portion (stamp ink exuding portion) does not reach to the corresponding thermal transfer sheet and does not lead to bubble blockage on the surface of the corresponding stamp material, because the portion where there is no substance that emits heat by infrared rays transmits infrared light and does not generate heat.
Is formed.

[0007] Preferably, the stamp material has a melting temperature of 5
0 to 150 ° C. and average pore diameter of three-dimensional network structure 2 to 10
A 0.5 to 10 mm-thick sheet of a polyolefin-based foam having micro continuous pores of μ and a porosity of 30 to 80%,
The molten transfer material of the thermal transfer sheet is one that has a melting temperature of 50 to 200 ° C. without being exothermicly melted only by flash light irradiation.
Further, the stamp material is irradiated with flash light in a state of being compressed by 5 to 70% so that the stamp ink non-bleeding portion of the stamp material is a recess of 0.01 mm or more,
Infrared rays that generate heat on the manuscript are carbon black,
Inks, toners and foils containing a polymer substance are preferable.

The stamp material having open cells that can be impregnated with the stamp ink used in the method for producing a stamp printing plate of the present invention may be any material as long as it is an open pore body having an excellent self-holding ability for the stamp ink. Natural rubber,
Synthetic rubber-based sponge rubber, synthetic resin foam and the like are shown, but preferably, they have fine continuous pores having a melting temperature of 50 to 150 ° C. and an average pore diameter of 2 to 10 μm, and a porosity of 30 to 30.
A 0.5-10 mm thick sheet of 80% polyolefin foam is used.

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

The thermal transfer sheet in the manufacturing method of the present invention is manufactured by coating or vapor-depositing a molten transfer material which is melted by heating on the film. The melt transfer material has a melting point of 50 to 160 ° C., which is higher than the melting temperature of the stamp material. This melt transfer material does not generate heat by direct flash light irradiation from at least the non-melt transfer material surface of the thermal transfer sheet of infrared rays, but melts by the heat of another material. In the present invention, it generates heat by the infrared rays used for the original. Ink, toner,
It is a material that melts due to the heat generated by a material such as foil.

The thickness of the melt transfer material of the thermal transfer sheet is an important factor. If the thickness is too thin, the effect of blocking bubbles due to the transfer of the melt transfer material cannot be expected, and if it is too thick, the infrared rays used for the original document generate heat. Not only does the material require excessive flash irradiation energy, but the melted transfer material transferred to the surface of the stamp material does not become blocked on the printing surface and the bubbles do not clog up. Is not preferable. Therefore, good results are obtained when the thickness of the molten transfer material of the thermal transfer sheet used in the present invention is 0.5 to 10 μm, preferably 2 to 5 μm. The PET film is used as the material of the thermal transfer sheet, and the thinner it is, the more efficient the heat transfer is. However, since the film and the stamp material are adhered to each other through the molten transfer material after the flash light irradiation, it is necessary to peel them off. In order not to do so, a thickness of 10 μm or more is preferable. Further, by providing an aluminum vapor deposition surface on the non-melt transfer material surface of the thermal transfer sheet, the melt transfer material is not melted by flash light irradiation, so that the degree of freedom in blending the melt transfer material is increased.

The original used in the manufacturing method of the present invention is a paper on which infrared rays can be transmitted, a film, etc., on which a black-and-white reversal image of the imprint is formed with ink, toner, etc. which generate heat by infrared rays. That is, characters, symbols, figures, etc. are expressed on paper, film, etc. with ink, toner, etc., but the film has a high infrared transmittance, and the characters, symbols,
In principle, it is best for drawing lines such as graphics to have a thickness that does not allow infrared rays to pass through, such as ink, toner, and films, which have high heat generation efficiency when irradiated with infrared rays. However, there are many restrictions on how a general user can produce the best imprint document, and since the toner used for PPC copying contains carbon and generates heat with infrared rays, the imprint document in the manufacturing method of the present invention must be created. It is preferable to be able to use the one produced by the PPC copier in order to make it easy and to reduce the failures as much as possible. That is, PPCs are currently used in companies, schools, convenience stores, etc.
The copier is almost ready for use, and the imprint original can be easily produced.

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. In this case, there is no difference in performance that causes a problem with the heat generated by the infrared rays of the toner, but the thickness of the paper varies greatly depending on the copying machine, and it is necessary to deal with this by limiting the paper and increasing the amount of flash irradiation energy. Other methods of making manuscripts are thin P
Aluminum is vapor-deposited on ET film. A black-and-white inverted mirror image of the imprint is drawn with ink, toner that heats up with infrared rays on this with an inkjet, thermal transfer printing, leather printer, PPC copier, etc. so that the surface opposite to the drawing surface is in contact with the thermal transfer sheet. Or heat-transfer sheet surface of non-melt transfer material is vapor-deposited with aluminum, and black-and-white inverted mirror image of imprint is printed directly on this surface with ink and toner by inkjet, thermal transfer printing, leather printer, PPC copier, etc. There is a method. By providing the aluminum vapor deposition surface on the PET film in this manner, infrared rays do not reach the melt transfer material, so that a thermal transfer sheet having a high degree of freedom in blending the melt transfer material and good performance can be used.

In the method for producing a permeation printing plate of the present invention, for example, a melt transfer substance which is melted at a temperature equal to or higher than the temperature of the stamp material is preferably formed on the surface of the stamp material made of an elastic resin having open cells that can be impregnated with the stamp ink. A thermal transfer sheet coated with a thickness of 0.5 to 10 μm on an infrared ray opaque film is overlaid so that the molten transfer material is in contact with the surface of the stamp material, and a black and white imprint drawn with the infrared heat generating material. By irradiating a flash image containing infrared rays from above the original in a state where the stamp material is compressed to a mirror image and the stamp material is compressed by 5 to 70%, a substance that heats by the infrared rays of the original, that is, ink, toner, carbon or polymeric substances contained in the foil generates heat by infrared, melt transfer material portion of the thermal transfer sheet corresponding with the heating and part of this heat is melted The molten melt transfer substance is transferred to the stamp material surface. Further, since the melting temperature of the molten transfer material is equal to or higher than the melting temperature of the stamp material, the surface layer of the stamp material is melted at the same time as the above transfer to form a transfer melting portion (stamp ink non-exuding portion) in which continuous bubbles are closed, The non-existing portion of the substance that generates heat with infrared rays does not generate heat by transmitting infrared rays, does not change to the corresponding thermal transfer sheet, does not lead to blockage of bubbles on the surface of the corresponding stamp material, and forms a non-transfer area (stamp ink exudation area). , 0.01 mm of the stamp ink non-bleeding part to the stamp ink bleeding part of the stamp material
The above-mentioned concave portion is formed. Here, it is preferable that the melt transfer material is a material that does not heat and melt with infrared rays, but if there is a restriction on the composition and inconvenient, an aluminum vapor deposition surface or the like is provided on the heat transfer sheet or the original to make it infrared opaque. There is a need. As described above, since the melting temperature of the melt transfer material is equal to or higher than the melting temperature of the stamp material, the surface layer of the stamp material is melted together with the above transfer. At this time, since the stamp material is compressed, the bubbles are compressed and the whole is brought into close contact with each other to close the continuous bubbles, thereby forming a transfer melted portion (stamp ink non-bleeding portion). By compressing this stamp material, the irradiation energy of flash light can be reduced, and the device can be simplified. Also, because the air bubbles are blocked over multiple layers,
At the time of printing, there is no influence on the ink bleeding at one non-transfer portion (stamp ink bleeding portion), and a fine imprint can be obtained clearly. Further, since the irradiation energy is small, the thermal influence on the non-transfer portion is small, and even fine lines can be reproduced.

That is, the ink non-bleeding portion is formed in the ink exuding portion of the stamp material to be a recess having a thickness larger than the film thickness of the molten transfer material with respect to the ink exuding portion, and the ink non-bleeding portion can be formed with a relatively thin film thickness. The ink non-bleeding portion can be formed with significantly less energy compared to the case where the ink non-bleeding portion is formed only by itself. Reproduction is also possible, and the non-bleeding portion of the printing surface can be made into a concave portion to obtain a clear impression. Even when the melting temperature of the melt transfer material is higher than the melting temperature of the stamp material, it is possible to close the bubbles in multiple layers by compressing the stamp material and irradiating it with flash light. In comparison, even if the thickness of the melt transfer material is thin, the performance as an ink non-bleeding portion can be obtained and the flash energy can be further reduced. In particular, when the surface of the stamp material is low in smoothness, a sufficient imprint cannot be obtained unless a sufficient amount of compression is applied, because a part of the closed state of bubbles is generated.

The difference between the transfer-melting portion in which the air bubbles are blocked and the non-transfer portion in which the air bubbles are not blocked is the difference between the stamp material and the non-transferred portion when the infrared rays are irradiated.
The stamp material is elastically deformed by approx. 70% to bring the adjacent structures into close contact with each other, and the surface of the stamp material is melted to a certain depth by the heat of heating to form a concave shape, and the step difference between the transfer fusion portion and the non-transfer portion is 0. It is preferably 01 mm or more. That is, as the pore diameter of the printing material used in the present invention, a preferable performance is 3 to 5 μ, but if the step is 0.05 mm or more, 10 to 15 layers of pores in the thickness direction of the printing material are compressed and closed. For example, not only the ink tamp material having a viscosity of 100 to 1,500 mPa · s can be melted in close contact but also the melt transfer material can be transferred to the surface of the stamp material to suppress the exudation of the stamp ink at the non-exuding portion with less energy. Is something that can be done. That is, the stamp size is 30 * 5
When the ink viscosity is 0 mm, the ink viscosity is about 1,000 mPa · s, and if the printing material pore size is about 3 μ, even if there is a step difference of about 0.01 mm, the amount of ink filled in the printing material is about 0.2 mg. Although the performance can be maintained, when the melt transfer material is transferred to the stamp material with a film thickness of 5 μ as in the present invention, even if the stamp material is filled with an ink amount of 2 mg when platemaking is performed with the same energy, It is possible to obtain a stamp having a long life because stains on the paper surface at the time of imprinting with the stamp ink at the bleeding portion do not occur.

The permeation printing plate obtained by the production method of the present invention is
Although it has the advantage of functioning as a stamp even if it is not assembled with other members, it can be made into a normal stamp by mounting the permeation printing plate on the base. As for its use, by preliminarily impregnating or occluding the stamp ink in the permeation printing plate, a clear imprint can be imprinted repeatedly without replenishing the ink for a long time. The ink stored in the stamp is not volatile at room temperature and has a viscosity of 100-
The one having 3,500 mPa · s shows preferable marking performance. In particular, a stamp ink of 500 to 1,500 mPa · s is preferable in terms of the ease of filling the stamp material and the amount of ink bleeding during 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 3 having an imprint original image 8. Production of the printing plate: The printing image is overlaid on the transparent glass plate 2 of the xenon flash light emitting device 1 having an emission energy of 50 joules so that the printing image P of the printing image M3 of the printing image M3 is a normal image, and is further melt-transferred. With surface 5 facing up,
A thermal transfer sheet 4 is superposed, and 3 µ fine open cells having a three-dimensional network structure are provided on the thermal transfer sheet 4, the porosity is 60%, and the melting temperature is about 70.
A stamp material (foamed polyethylene sheet) S7 having a thickness of 1.6 mm, which is at a temperature of ℃, is placed on top of it (see FIG. 1A). The thermal transfer sheet 4 used here has a melt transfer material (melting temperature of 100 ° C., which is higher than that of the foamed polyethylene sheet) made of wax, resin, etc., and an acetate film (thickness: 20 μm).
m) was applied to a thickness of 5 μm. The back surface of the acetate film was an aluminum vapor deposition surface 6 '. Next, 50% elastic deformation is applied to the expanded polyethylene sheet in the thickness direction.
Flash light was applied while pressure was applied to give a degree.
As shown in FIG. 1B, when the thermal transfer sheet 4 having a melt transfer material is used, the surface of the polyethylene sheet S7 has the imprint original image L of the imprint original M3 as the transfer melted portion H and the melt transfer material H. Due to heat generation, the polyethylene sheet S7
And the surface layer of the polyethylene is melted. The other surface is on the non-transfer portion and remains as a mirror image. Since the foamed polyethylene sheet is compressed, air bubbles are compressed and the molten transfer material is transferred to the surface of the foamed polyethylene sheet in a state where the sheet itself is in close contact, so that the open cells are closed. Adhesion of the foamed polyethylene sheet itself due to transfer and pressurization of the melt transfer material and solidification of bubbles in the surface layer of the polyethylene sheet due to melting of the heat of the melt transfer material. The thickness of the molten transfer material of the thermal transfer sheet affects the platemaking energy and the stamping performance,
Even if the thickness is about 0.5 μm, the labor saving effect of plate making energy is recognized as compared with the case where the heating element applied to the thermal transfer sheet is not a melt transfer substance. On the other hand, plate making is possible even if the thickness is about 10μ, but it requires a large amount of energy, and further compression of the stamp material is required to provide a step on the stamp surface. The energy efficiency of plate making was high and the imprint of the stamp was clear.

[0020]

EFFECTS OF THE INVENTION The method for producing a permeation printing plate according to the present invention has a simple process and does not require a mold, so that a high-quality stamp suitable for the purpose can be promptly provided. Also, by compressing the stamp material during flash irradiation,
Not only the transfer of the melted transfer material, but also the stamp material is completely adhered and melted, so that the bubbles are completely blocked and a clear transfer melted part (that is, the stamp ink non-exudation part) is formed. The bleeding of the stamp ink can be obtained smoothly (that is, the stamp ink bleeding portion) and a clear impression can be obtained. There is also an advantage that a black-and-white inverted stamp can be easily created.

[Brief description of drawings]

FIG. 1 is a schematic diagram of the production of a stamp printing plate, where (a) shows the state of the thermal transfer sheet and the stamp material after the irradiation when the thermal transfer sheet made of a molten transfer material is used before the flash irradiation. It is the figure which showed typically.

FIG. 2 is an enlarged view of a transfer fusion portion and a non-transfer portion when a thermal transfer sheet made of a fusion transfer material is used.

[Explanation of symbols]

1 Flash emission part 2 glass plates M3 manuscript 4 Thermal transfer sheet 5 Melt transfer material 6 Acetate film 6'Aluminum deposition layer S7 Stamp material (foam polyethylene sheet) L seal image H transfer melting part I Non-transcription part 11 Transfer part 12 fusion zone

Continuation of front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) B41K 1/50 B41C 1/00 B41C 1/055-1/06

Claims (4)

(57) [Claims] 1. A surface of a stamp material made of an elastic resin having open cells capable of being impregnated with the stamp ink, and a melt transfer substance which melts at a temperature equal to or higher than the melting temperature of the stamp material to a film.
A thermal transfer sheet having a thickness of 5 to 10 μm was overlaid so that the melt transfer material was in contact with the surface of the stamp material, and the thermal transfer sheet was transferred.
A stamped black-and-white inverted image of a document drawn with a substance that heats with infrared rays is superimposed on the surface of the copy sheet to form a mirror image.
By irradiating the surface of the document on which the material, the thermal transfer sheet and the document are superposed with each other, with a flash of light including infrared rays, the portion of the document where the substance is heated by the infrared ray is heated by the infrared ray, and the corresponding thermal transfer is performed. Melt the melt transfer material on the sheet,
The molten transfer material is transferred to the stamp material, and the surface layer of the stamp material is closely fused to form a transfer melted portion (stamp ink non-exudation portion) in which continuous bubbles are closed, while a material-absent portion that generates heat by infrared rays of the original is without heating and transmits infrared rays, no change to the corresponding said thermal transfer sheet, the corresponding non-transfer section not lead to pore closed the surface of the stamp material (stamp ink exuding section) inking stamp plate and forming a Manufacturing method. Wherein said stamp material has a melting temperature of 50 to 15
0 is ℃ a 0.5~10mm thick sheet average pore diameter polyolefin foam fine has a continuous pore porosity 30% to 80% of 2~10μ steric network structure, the thermal transfer <br/> Sea Is the infrared that the infrared does not reach the melt transfer material.
The method for producing a permeation printing plate according to claim 1 , wherein the film is impermeable to rays and the melt transfer material has a melting temperature of 50 to 200 ° C. 3. The penetration according to claim 1, wherein the stamp material is compressed by 5 to 70% and is irradiated with flash light to form a stamp ink non-bleeding portion of 0.01 mm or more with respect to the stamp ink bleeding portion of the stamp material. Printing plate manufacturing method. 4. The method for producing a permeation printing plate according to claim 1, wherein the substance that generates heat with infrared rays on the original is carbon black, an ink containing a polymer substance, a toner, or a foil.