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Patent Searching and Data


Title:
SECURITY PAPER
Document Type and Number:
Japanese Patent JP3211543
Kind Code:
B2
Abstract:

PURPOSE: To obtain security paper having neither problem in terms of papermaking caused by metal fibers nor reduction in physical properties of paper, usable for electric measurement such as electrical conductivity and magnetic measurement such as microwave examination without giving rise to trouble in both the measurements.
CONSTITUTION: (1) This security paper is mixed with 0.05-1wt.% based on pulp of carbon fibers whose surfaces are coated with a ferromagnetic substance. (2). This security paper comprises fibers having 3-10mm fiber length and 5-20μm diameter of fibers section and has 1-5μm thickness of a coated metal film and ≤1×10-4Ω.cm electric resistivity of the carbon fiber coated with the metal.


Inventors:
Otsuka, Hiroaki
Yamada, Nobuo
Application Number:
JP1994000032459
Publication Date:
July 19, 2001
Filing Date:
March 02, 1994
Export Citation:
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Assignee:
HONSHU PAPER CO LTD
International Classes:
B42D15/10; C22B23/00; D21H13/48; D21H13/50; D21H21/40; D21H21/48; D21H27/00; H01F1/00; H01F1/04; (IPC1-7): D21H21/48; B42D15/10; D21H13/48