JPS56127490A - Seal forgery preventing method utilizing heat-sensitive ink - Google Patents

Seal forgery preventing method utilizing heat-sensitive ink

Info

Publication number
JPS56127490A
JPS56127490A JP3209680A JP3209680A JPS56127490A JP S56127490 A JPS56127490 A JP S56127490A JP 3209680 A JP3209680 A JP 3209680A JP 3209680 A JP3209680 A JP 3209680A JP S56127490 A JPS56127490 A JP S56127490A
Authority
JP
Japan
Prior art keywords
ink
seal
cover
method utilizing
adhesive gluing
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP3209680A
Other languages
Japanese (ja)
Inventor
Eisuke Shioyama
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Dai Nippon Printing Co Ltd
Original Assignee
Dai Nippon Printing Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Dai Nippon Printing Co Ltd filed Critical Dai Nippon Printing Co Ltd
Priority to JP3209680A priority Critical patent/JPS56127490A/en
Publication of JPS56127490A publication Critical patent/JPS56127490A/en
Pending legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M3/00—Printing processes to produce particular kinds of printed work, e.g. patterns
    • B41M3/14—Security printing
    • B41M3/144—Security printing using fluorescent, luminescent or iridescent effects

Abstract

PURPOSE:To prevent the forgery of a seal by a method wherein the sealed surface is covered with a transparent film containing an ultraviolet absorbing agent through an adhesive gluing agent containing one of two components so that the seal impression cannot be readily read. CONSTITUTION:On a print 2, a seal is stamped to form a seal impression 3 by using, instead of the vermilion ink, an ink containing the A material in a two-part liquid reaction type heat-sensitive color former. Subsequently, a cover 4, which is made of transparent film containing an ultravioler absorbing agent, is attached to said sealed surface through an adhesive gluing agent containing the B material. The adhesive gluing agent 5 is applied to the whole surface of the cover 4. After said cover 4 has been provided, if black light is applied, ultraviolet rays are absorbed, so that the portion of the ink 2 will not fluoresce. Therefore, there is no difference between the luminances of the reflected rays from the portions of the ink 2 and the ink 3, so that it is completely imposibble to read the seal impression.
JP3209680A 1980-03-13 1980-03-13 Seal forgery preventing method utilizing heat-sensitive ink Pending JPS56127490A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP3209680A JPS56127490A (en) 1980-03-13 1980-03-13 Seal forgery preventing method utilizing heat-sensitive ink

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP3209680A JPS56127490A (en) 1980-03-13 1980-03-13 Seal forgery preventing method utilizing heat-sensitive ink

Publications (1)

Publication Number Publication Date
JPS56127490A true JPS56127490A (en) 1981-10-06

Family

ID=12349351

Family Applications (1)

Application Number Title Priority Date Filing Date
JP3209680A Pending JPS56127490A (en) 1980-03-13 1980-03-13 Seal forgery preventing method utilizing heat-sensitive ink

Country Status (1)

Country Link
JP (1) JPS56127490A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58120077U (en) * 1982-02-10 1983-08-16 凸版印刷株式会社 Concealment sticker
JPS59122277U (en) * 1983-02-04 1984-08-17 凸版印刷株式会社 ledger
FR2646183A1 (en) * 1989-04-19 1990-10-26 Tucherer Laurent Non-photocopiable document

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58120077U (en) * 1982-02-10 1983-08-16 凸版印刷株式会社 Concealment sticker
JPS59122277U (en) * 1983-02-04 1984-08-17 凸版印刷株式会社 ledger
JPH0129108Y2 (en) * 1983-02-04 1989-09-05
FR2646183A1 (en) * 1989-04-19 1990-10-26 Tucherer Laurent Non-photocopiable document

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