| 摘要 |
PURPOSE: A structure for convenient incision of an envelope is provided to open the envelope with convenience to lead publicity and effect of notification by customers, and to prevent contents from being spoiled during opening without a tool. CONSTITUTION: The envelope includes an incision unit to put a finger in at the front edge thereof. An opening unit has a perforated line in advance, so that the envelope can be opened to put the finger in the incision unit without any tool. The shape of the incision unit can be designed with various types and supposed to get a visual effect. A method for forming the incision unit with an inserting part for a finger and the perforated line is same to the manufacturing process of general envelope, and the incision unit and the perforated line can be simply made by preparing the incision unit and the perforated line in advance during cutting operation.
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