Printing – Printing members – Blanks and processes
Patent
1995-06-02
1997-03-18
Funk, Stephen R.
Printing
Printing members
Blanks and processes
101333, B41K 150
Patent
active
056112793
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a process of producing a printing plate for a stamp. More specifically, the present invention relates to a stamp as well as to a process of producing a printing plate for a stamp which is made of a sponge having open cells and absorbs stamp ink so as to be able to make repeated impressing operations without supplying stamp ink for a long time.
BACKGROUND ART
In order to save time and labor for applying stamp ink on a stamping surface every time a stamp or stamping plate is impressed, a stamp has been known which has a stamping material made of a rubber sponge having open cells and allows the material to previously occlude ink. For producing the stamp, a producing process of the stamp is disclosed in Japanese patent Application Laid-Open Sho 60 No.193686 in which other part than the impress image forming portion on the sponge surface is pressed and cured to in concave state by hot emboss-forming, so that the convex portion of the sponge may serve as an ink occluding portion for producing the impress image forming portion. Japanese Patent Application Laid-Open Sho-50 No.155434 also discloses a method in which a porous material is pressed against a similar heated plate. These methods, however, require a mold for the heated plate and time and labor for engraving or etching characters, signs, patterns etc. on the die.
Japanese Patent Application Laid-Open Sho-57 No.136652 as well as Japanese Patent Application Laid-Open Sho-49 No.7003, disclose a method of producing a printing plate comprising the steps of: applying a photopolymeric liquid resin on the surface of a stamp-piece made of sponge; placing a positive sheet over the top of the stamp-piece; irradiating the stamp-piece from above with ultraviolet rays to cause a photopolymeric reaction; and washing out the unconverted resin. A similar method using a film negative is disclosed in Japanese Utility Model Application Laid-Open Sho-52 No.71710. Each of these methods, however, has a drawback, such as, for example indulges complicated steps such as preparing a film negative or positive, application of resin, photopolymerization, rinsing and so on. Also, a reference to preparation of a printing surface using a stamp-piece made of sponge is written in Japanese Patent Application Laid-Open Hei 3 No.96383. Further, Japanese Utility Model Application Laid-Open Sho-50 No.41620 shows a method of preparing an original by decomposing a manuscript material with a screen in order to create a stamp of a photograph or a design having gradations in tone.
SUMMARY OF THE INVENTION
It is an object of the present invention to solve the above problems and provide a process of producing a printing plate for a stamp having open cells therein, based on a simple manufacturing process using simple devices. Another object of the present invention is to provide a printing plate for a stamp which has open cells and is capable of producing a clear impression. Still another object of the present invention is to provide a process of producing a printing plate for a halftoned stamp having open cells whereby photographs and designs having gradations in tone can be easily formed into a halftoned stamp.
In order to attain the above objects, the present inventors earnestly studied and found a process of producing a printing plate for a stamp wherein oozing areas of stamp ink and non-oozing areas of stamp ink are created by placing a manuscript over a stamp-piece having open cells with a heat-generating plate interposed therebetween and irradiating the manuscript with a radiation of light beams. The present innovators further developed on the basis of the above method, a producing process without using any heat-generating plate, a producing process of a printing plate for a stamp wherein a manuscript is immersed in a liquid substance so that the light-transmittance through the manuscript is improved, and a producing process of a printing plate for a stamp of a design having gradations in tone by using a screen-like heat-generating plate, an
REFERENCES:
patent: 5392711 (1995-02-01), Kainuma
Ando Yoichi
Hirano Koichi
Nakamura Fumitoshi
Shiraishi Haruhito
Suzuki Susumu
Funk Stephen R.
Mitsubishi Pencil Kabushiki Kaisha
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