| 摘要 |
PROBLEM TO BE SOLVED: To provide a concealed postcard, which can be manufactured at low cost by omitting unnecessary adhesive, in which the adhesive strength of a bonding layer can be changed partially without increasing the number of processes and, in addition, the printing contents of which can be freely determined. SOLUTION: In a concealed postcard, in which a sheet piece 3 is separably laminated through an bonding layer 4 to one side of A postcard main body 2 so as to expose a concealed information through the separation of the sheet piece 3, the bonding layer 4 consists of an adhesive mainly made of a was emulsion, the adhesion of which is performed under undried state and the separation of which is so constituted as to be performed through an interlaminar cohesive failure without rebonding at the normal temperature.
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