INFORMATION CONCEALING SEAL

摘要

PROBLEM TO BE SOLVED: To provide an information concealing seal which can prevent a filled secret information entry part of a posted or delivered information sheet from being furtively glanced at by a third person before receiver's receiving the information sheet and can prevent mischief because being not restorable after peeling-off and can be easily opened by the receiver. SOLUTION: The information concealing seal is constituted by successively laminating a strong adhesive layer 3 and a release paper 4 on one face of a concealing substrate 2 and is stuck to the secret information entry part provided on the information sheet to conceal entry items after having the release paper peeled off therefrom. The strong adhesive layer has the adhesive power reduced when being irradiated by ionizing radiation. COPYRIGHT: (C)2008,JPO&INPIT