JP3529456B2 - Manufacturing method of stamp plate for stamp - 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 producing a stamp printing plate. More specifically, the present invention relates to an improvement in a method for producing a stamp printing plate made of a sponge material having open cells that can be repeatedly imprinted by impregnating the ink without supplying the ink for a long time.

[0002]

2. Description of the Related Art In order to save the trouble of adhering the stamp ink to the stamp surface each time the stamp or stamp is imprinted, it is known to use a sponge rubber with open cells as the stamp material and to absorb the ink in advance. Has been. As a method for producing the stamp, Japanese Patent Laid-Open No. 60-193
Japanese Patent No. 686 discloses a method of manufacturing a stamp in which a portion other than a seal-imprint forming portion on the surface of a sponge is depressed by heat embossing to be solidified, and a convex portion is used as an ink storage portion to form a seal-imprint forming portion. Japanese Patent Laid-Open No. 155323/1975 discloses a method for pressure-bonding a porous body to 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.

In JP-A-57-136652 and JP-A-49-7003, a photopolymerizable liquid resin is applied to the surface of a sponge stamp material, a positive film is placed on the upper surface of the material, and ultraviolet rays are irradiated from above. Then, a photopolymerization reaction is caused to occur, and an unreacted resin is washed and removed. A production method of a printing plate is disclosed. Japanese Utility Model Publication No. 52-71710 discloses a plate printing method using a negative film. It is disclosed. However, these methods have drawbacks in that the steps such as forming a negative or positive film, coating a resin, photopolymerization, and washing with water are complicated.

[0004]

SUMMARY OF THE INVENTION An object of the present invention is to solve the above problems by providing a method of manufacturing a stamp printing plate having open cells, which has a simple manufacturing process and apparatus. Another object of the present invention is to provide a stamp printing plate having open cells capable of obtaining a clear impression.

[0005]

[Means for Solving the Problems] In order to achieve the above-mentioned object, the present inventors have conducted extensive studies and have already made a patent application
Filed 269685 and Japanese Patent Application No. 6-21467,

A stamp material made of an elastic resin having open cells and capable of being impregnated with a stamp ink is provided with a recording material absent portion and a recording material existing portion through a heating plate including a heating material whose temperature rises when exposed to light. The originals showing characters, figures, etc. are overlapped, the originals are irradiated with light, and the light transmitted through the recording material absent portion raises the temperature of the heat generating material at the portion corresponding to the recording material absent portion. The surface of the stamp material at a location corresponding to the heat-generating material whose temperature has risen is melted by the heat to block air bubbles, and a stamp ink non-exuding portion is provided. By suppressing the temperature rise of the heat generating material at the location corresponding to the existing portion and maintaining the open air bubbles on the surface of the stamp material at the location corresponding to the heat generating material whose temperature rise is suppressed Shows the preparation of stamp printing plate to Npuinki exudation unit, although the method of further penetration of the liquid substance to the original, the present invention has been completed by repeatedly further consideration to this.

That is, in the method for manufacturing a stamp printing plate of the present invention, in the above-mentioned manufacturing method, a liquid is applied to the original to improve the transmission efficiency of flash light, and at the same time, the heat is blocked or absorbed by the liquid. Characterize. The manuscript material in the manuscript has a liquid absorbing property, and the liquid is preferably a mixed solution of water and an accelerating aid for permeating water into the manuscript material. Further, it is preferable that the stamp material is compressed by 5 to 70% in thickness at the time of flash light irradiation, and it melts to a certain depth of the surface layer with a small amount of energy to completely close the bubbles and the molten portion of the material surface becomes concave. You can get a clear impression. Further, the original coating solution of the present invention is used when producing a stamp material having open cells made of water containing a penetration aid such as phenyl glycol.

The stamp material used in the manufacturing method of the present invention may be any material as long as it is made of an elastic resin having open cells and capable of being impregnated with the stamp ink. Porous bodies are preferable, and examples thereof include natural rubber, synthetic rubber-based sponge rubber, and synthetic resin foam such as polyethylene and polyurethane. The shape may be a plate-like, sheet-like or film-like shape as long as the surface forming the imprint is smooth, but preferably has a three-dimensional network structure having an average cell diameter of 2 to 10 microfine open pores and an average pore diameter. 2-10μ, porosity 30-80
%, A polyolefin foam having a melting temperature of 50 to 150 ° C. has a thickness of 0.5 to 10 mm.

The irradiation of light in the manufacturing method of the present invention uses light including infrared rays, and uses flash light using a xenon flash device, a photostrobe flash, a flash bulb or the like as a light source. In order to increase the melting efficiency of the stamp material, it is preferable to apply pressure so that the thickness of the stamp material, which is the object to be irradiated, becomes 95 to 30% during light irradiation. It is preferable to compress the stamp material so that the step difference between the stamp ink exuding portion and the stamp ink non-exuding portion of the printing plate obtained by plate making is 0.01 mm or more. By irradiating the stamp material in a compressed state, not only the surface of the stamp material but also bubbles that are adjacent in the thickness direction can adhere and melt to a certain depth of the surface layer, and it is possible to block the bubbles at required locations with less energy. Become. This irradiation energy depends on the size of the printing plate, but is greatly affected by the thickness of the original used, and can be made smaller for thinner and higher transparency. If you do not pressurize,
Not only does it require a large amount of energy to completely block open cells on the surface of the stamp material, making the device expensive, but it also affects the non-melting area (stamp ink exudation area) of the stamp material to obtain a clear stamp. Can not.

An original is a character / figure or the like represented by a recording material absent portion and a recording material present portion, and a character / figure or the like present portion (imprint original image) is represented by the recording material absent portion. Characters, figures, and the like that represent existing portions in the material-absent portion, and patterns that represent shades due to differences in the dot density of the recording-material-absent portion or the recording-material-present portion can be given. Further, only the recording material existing portion, which is the recording material absent portion (that is, the original material portion), is also referred to as an original in the present invention. Specifically, writing, drawing, printing, copying, word processor, type, coating, etc. on manuscript sheets such as paper, transparent film, PPC copy paper, etc.
It represents a stamp imprint original image of characters, symbols, figures, etc. by a method such as adhesion or lamination, and may be either a positive image or a negative image as required. The recording material in the recording material existing portion may be any material as long as it is a material that absorbs or reflects infrared rays, such as pencil, ink, toner, felt-tip pen ink, ballpoint pen ink, printing ink, paint, paint,
Colored paper, which represents figures of letters, foil of plastic, etc. are shown. The recording material absent portion corresponds to the material portion of the original sheet. The opaque original sheet is preferably one that easily penetrates the liquid substance described below.

Further, as the original having gradation, characters, symbols, figures, etc. are recorded with a recording material such as ink or toner which absorbs or conceals infrared rays on a sheet for originals such as paper or transparent film which can transmit infrared rays. The difference in dot density represents the shade. For photographs having gradation, it is preferable to prepare the original used in the present invention by PPC copying. It is preferable to use an ink that does not generate heat on the transparent film because the paper and the film used for the original sheet have a high infrared ray transmittance, and the higher the efficiency of absorbing or blocking the infrared rays, the higher the plate making efficiency. However, it is preferable to set the original as a standard for the original because of the following reasons. In other words, PPC is currently used at convenience stores, companies, schools, etc.
Since copiers are widely used, even general users can use them without failure, and since there is no performance difference that causes a problem in the infrared absorption rate of various toners, the originals produced by PPC copying are used as standard originals. This is because it becomes much more convenient for general users to create original stamps, and it is possible to prevent the failure of plate making due to the recording material of the original. However, the thickness of the paper varies widely among the copying machines, making stable plate making impossible. In order to solve this, there is a method of supplying an optimum paper and producing an imprint original using this, but it is almost impossible to avoid paper jam troubles especially at convenience stores.

In order to solve the above problems, the present invention provides
Applying a liquid to the imprint original made by copying on PPC copying paper with a PPC copying machine to increase the infrared transmittance of the PPC copying paper and absorb the variation in the thickness of the paper to make the infrared transmittance almost uniform. I found that I can do it. This is not limited to the PPC copy original, and the same can be applied to an original written on a similar sheet with a writing instrument such as a pencil or a felt-tip pen, an original output from a printer, or an original printed.

In forming the stamp surface of the stamp material in the manufacturing method of the present invention, a heating plate is superposed so that the ink surface comes into contact with the surface of the stamp material, and a liquid containing at least water is applied thereon to transmit infrared rays. When the imprint originals with improved efficiency are stacked in a mirror image and a flash of infrared rays is radiated from above, the infrared rays of the parts other than the imprint original image of the imprint originals reach the heating plate through the imprint originals and are heated. Heating the carbon and polymer substances contained in the plate ink and toner,
The surface of the stamp material is melted and the air bubbles are closed, so that the stamp ink stored in the stamp material does not flow. On the other hand, since the toner for PPC copying contains carbon and polymer resin due to irradiation of infrared rays, heat is generated in the image area of the imprinted original of the imprinted original, but in many cases this heat reaches the heating plate and is caused by the heat of the heating plate toner. There is no melting of the surface layer of the stamp material, and the surface of the stamp material does not change, and the ink occluded in the stamp material becomes a portion to be exuded. A stamped surface is formed by melting and non-melting portions on the surface of these stamp materials, and a desired imprint is obtained from this portion at the time of printing.

However, when the temperature of the plate making environment is high, the heat generated in the image portion of the original image of the stamp is transmitted to the heating plate and the bubbles on the surface of the stamp material may be blocked, so that the ink bleeding becomes worse during printing. Even when the imperfections and the line width of the stamp imprint document image portion of the stamp imprint document are narrow, air bubbles are blocked on the surface of the stamp material due to the heat generation of the stamp imprint document image portion and the heat generation around the stamp imprint document image portion, resulting in a print defect during printing. Against the above disadvantage, since the liquid containing water of the present invention is applied to the original,
Even if the flash image is irradiated and heat is generated in the image area of the seal image of the original, the water applied to the original absorbs the heat, and it is difficult to reach the heating plate and a good stamp can be obtained. At the time of this infrared irradiation, the stamp material is compressed by about 5 to 70%, the bubbles of the stamp material are elastically deformed to bring the adjacent structures into close contact, and the heat of heating melts the stamp material surface to a certain depth to form a concave shape, It is preferable that the step difference between the melted portion and the non-melted portion is 0.01 mm or more. That is, it is preferable that the printing material used in the present invention has a pore diameter of 3 to 5 .mu.m, but if the step is 0.05 mm or more, it is 1 in the thickness direction of the printing material.
If the pores of layers 0 to 15 are compressed and closed, the viscosity will be 100.
Sufficient performance as a non-bleeding part for ink of up to 1,500 mPa · s. Also, the ink viscosity is 1,000 mPa
・ If it is about s and the pore size of the printing material is about 3μ, the step difference is 0.
Even at about 01 mm, the performance of the non-bleeding portion can be maintained if the amount of ink filled in the printing material is small. A step is formed between the ink bleeding portion and the non-bleeding portion during plate making, so that the ink does not bleed into the non-bleeding portion and stain the paper surface at the time of printing.

The stamp printing plate obtained by the manufacturing method of the present invention has an advantage that it functions as a stamp even if the surface of the stamp plate itself is made into a printing surface and is not assembled with other members. It can be used as a normal stamp by attaching it. As for its use, a stamp material having a stamped surface is preliminarily impregnated with or occluded with ink, so that a clear imprint can be repeatedly printed without replenishing ink for a long time. The ink stored in the stamp is not volatile at room temperature and has a viscosity of 100-3.
000 mPa · s shows preferable marking performance. Especially 5
An ink of from 0 to 1,000 mPa · s is preferable because it is easy to fill the printing material and the amount of 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 printing life and facilitate the replenishment of the stamp ink. Further, the stamp printing plate of the present invention can be continuously printed by mounting it on the roll surface and rotating the roll.

[0017]

Embodiments of the present invention will be described below with reference to the drawings. Preparation of imprint original: A printed matter is copied by a PPC copier to prepare an original M3 having an imprint original image L, and one or both sides of the original is applied with an original application liquid consisting of water containing 2% of phenyl glycol to transmit infrared rays. Improved efficiency. Here, phenyl glycol is an auxiliary agent that makes it easier for water to penetrate the paper,
Not limited to phenyl glycol, only water takes a long time to penetrate, and the effect does not change. Here, the liquid applied to the stamp imprint original is not limited to water, but the same performance is exhibited as long as it permeates the paper and has a thermal conductivity equal to or higher than that of water. Fabrication of a printing plate: The imprint document image L of the imprint 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 ink or toner surface 5 is heated upward. A plate 4 is overlaid, and a porosity of 60 with 3μ fine open cells having a three-dimensional network structure
%, A stamp material (foamed polyethylene sheet) S7 having a thickness of 1.6 mm is overlaid (see FIG. 1 (a)). These sheets were irradiated with a flash of light under a pressure applied so as to give an elastic deformation of about 5 to 50% in the thickness direction. As shown in FIG. 1B, when the heat-meltable ink sheet 4 is used,
On the surface of the polyethylene sheet S7, the imprint original image L of the imprint original M3 becomes a non-melting portion and remains as a mirror image. On the other surface, the heat-fusible ink is melted as the permeation-melting portion H and permeates into the air bubbles and at the same time as the polyethylene sheet S7. The surface melts and the open cells are closed. When a heating plate is used, as shown in FIG. 1B, the surface of the polyethylene sheet S7 is a non-melting portion of the imprinted original image L of the imprinted original M3 and remains as a mirror image, and the other surface is a fused portion H. As a result, the surface layer of the stamp material (foamed polyethylene sheet) S7 is melted and the open cells are closed.

Here, a PPC having a basis weight of 55 kg is used for the imprint original M3.
When using a copy of the imprint original image L on a paper with a PPC copying machine, use an acetate film coated with PPC copying toner, and use a stamp material S7 of 30 x 50 mm with a thickness of 1.6 mm up to 0.8 mm. Energy of about 100 joules was required to obtain the step difference between the melted portion and the non-melted portion that can be compressed to obtain a good imprint, but as in the present invention, liquid silicon was applied to the imprint original to transmit infrared rays. By improving the rate, it was possible to obtain 50 joules.

In general, the basis weight of PPC papers in circulation is 45 kg to 55 kg in the case of monochrome, but under the above plate making conditions, substantially the same level difference of the printing surface could be obtained for both papers. Conventionally, if the plate making apparatus uses a seal imprint document having a basis weight of 45 kg when the basis weight is 55 kg, the imprint document image L
Even a considerable amount of infrared rays reached, and the part that should originally be the non-melting part was partially melted and a good impression surface could not be obtained,
It was necessary to interpose a filter or the like to attenuate the energy for plate making. However, in order to obtain a clear impression, it is necessary to prepare filters corresponding to various paper thicknesses, and it is necessary for the user to select an optimum filter, which is not convenient.

Further, since the liquid applied to the imprint original according to the present invention contains water, when the imprint original is prepared by PPC copying, the original image contains carbon or a high molecular substance due to the flash light irradiation. When the temperature of the plate making environment is high due to heat generation of the image itself, or when the line width of the original image is narrow, the pores on the surface of the printing material are also partially blocked at the part corresponding to the ink bleeding part, and the imprint is thin or imperfect during printing. The shortcomings have been resolved. This is because the water contained in the liquid applied to the original absorbs the heat generated by the original image itself, and the line width that can be reproduced when applying the silicon liquid was 0.45 mm.
0.2 when phenyl glycol 2% is added to water
It was possible to be less than 5 mm. Regarding the plate-making environment temperature, good plate-making up to 35 ° C. was possible when 2% of phenyl glycol was added to water, which was 30 ° C. in the case of the silicon liquid.

[0021]

EFFECTS OF THE INVENTION The method for producing a stamp printing plate of the present invention has a simple process and does not require a mold or the like, so that a high-quality stamp suitable for the purpose can be promptly provided.
Particularly, in the present invention, the imprint original is coated with a liquid containing water to improve the infrared transmission efficiency, so that the continuous bubbles on the surface of the stamp material can be closed with a relatively small energy. In addition, since the stamp material is compressed during flash irradiation, not only continuous bubbles on the surface of the stamp material but also bubbles at the same time can be blocked to a certain depth, further reducing the energy, so that there is no effect on the non-transfer area or the non-melt area. It is possible to obtain a printing plate which is few and has good quality. Further PPC
When an imprint original is created by copying, the original image contains carbon and high-molecular substances due to the irradiation of flash light, so the original image itself heats up and the temperature of the plate making environment is high, or the line width of the original image is narrow. The problem that the pores on the surface of the printing material were partially blocked at the portion corresponding to the ink bleeding part and the imprint was thin or chipped during printing was solved.

[Brief description of drawings]

FIG. 1 is a schematic diagram of the production of a stamp printing plate, in which (a) shows the state of the heat-meltable ink sheet and the stamp material before irradiation with flash light and (b) when the heat-meltable ink sheet is used. FIG. 6C is a diagram schematically showing the situation of the stamp material after irradiation when a heating plate is used.

FIG. 2 (a) is an enlarged view of a melting portion and a non-melting portion when a heating plate is used, and FIG. 2 (b) is a permeation melting portion and a non-permeation melting portion when a heat-meltable ink sheet is used. FIG.

[Explanation of symbols]

1 Flash emission part 2 glass plates M3 imprint manuscript 4 Heating plate or heat-meltable sheet 5 Carbon or hot-melt ink 6 polyester film S7 Stamp material (foam polyethylene sheet) L seal image H fusion part or permeation fusion part I Non-melting part or non-penetrating melting part T heating plate f Original coating liquid penetration part

─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Koichi Hirano 2-5-12 Irie, Kanagawa-ku, Yokohama, Kanagawa Mitsubishi Pencil Co., Ltd. Research and Development Center (72) Inventor, Sumi Tamano, Kanagawa-ku, Yokohama, Kanagawa 2-5-12 Irie, Research & Development Center, Mitsubishi Pencil Co., Ltd. (56) References JP-A-50-31908 (JP, A) JP-A-6-1555698 (JP, A) JP-B-46-22642 ( JP, B1) (58) Fields surveyed (Int.Cl. ⁷ , DB name) B41K 1/50 B41C 1/00 B41C 1/055

Claims (4)

(57) [Claims] 1. A recording material absent portion and a recording material existence are provided through a heating plate containing a heating material whose temperature rises when exposed to light to a stamp material made of an elastic resin having open cells and capable of being impregnated with the stamp ink. The originals in which characters and figures are represented by the parts are overlapped, and the originals are irradiated with light, and the temperature of the heat generating material at the portion corresponding to the recording material absent portion is raised by the light transmitted through the recording material absent portion. The stamp ink non-bleeding portion is provided by melting the surface of the stamp material at a location corresponding to the heat-generating material whose temperature has risen by the heat to block air bubbles, and shields light at the recording material existing portion, By suppressing the temperature rise of the heat-generating material at the location corresponding to the recording material existing area, and maintaining the open state of open cells on the surface of the stamp material at the location corresponding to the heat-generating material whose temperature rise is suppressed. In a method of making a stamp printing plate with a tamped ink bleed portion, a liquid containing an auxiliary agent that promotes permeation into the original fabric is applied to the original to improve the efficiency of transmission of flash light, and at the same time, the heat of the original image of the original is blocked by the liquid. Alternatively, a method for producing a stamp printing plate, which is characterized by absorbing. 2. The method for producing a stamp printing plate according to claim 1, wherein the original material of the original is liquid-absorbent and the liquid is a liquid containing at least water. 3. The original material is paper, and the liquid is mixed with an auxiliary agent for promoting penetration into the liquid.
A method for producing the stamp printing plate described. 4. The liquid is 0.5 to 5% phenyl glycol.
The water according to claim 1, which is water to be contained .
The method for producing the stamp printing plate described in.