| 摘要 |
PCT No. PCT/JP82/00040 Sec. 371 Date Sep. 17, 1982 Sec. 102(e) Date Sep. 17, 1982 PCT Filed Feb. 12, 1982 PCT Pub. No. WO82/02791 PCT Pub. Date Aug. 19, 1982.In a blank sheet of a case for packaging a video tape cassette having main panels 1, 2, a black panel 3, and side panels 4, 5, 14, 15, side flaps 11, 12 are projectingly provided from the end edges of the side panels 4, 5 belonging to one main panel 1 toward the side panels 14, 15 belonging to the other main panel 2, and when, at the time of case forming, these side flaps 11, 12 are placed into the inner side of the back panel 3, and hot air is supplied into wedge-shaped spaces W between the opposed side flaps, 4, 14 and 5, 15 thereby to fusion bond the opposed side flaps, the hot air is prevented from reaching the cassette inserted beforehand into the case.
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