| 摘要 |
An inner seal portion (30a) of an open edge portion (1a, 1b) of a paper container (1) is faced to an inner peripheral heating portion of a seal-heating apparatus. An outer seal portion (30b) of the open edge portion is faced to an outer peripheral heating portion (4, 5, 6, 7, 13, 14, 15, 16) of the seal-heating apparatus. At least the inner peripheral heating portion (8, 17) is oscillated about an axial line thereof so as to vary the hitting position of the inner seal portion against which hot air blown from the hot air blowing holes (8a) of the inner peripheral heating portion (8) hits. Thus, the seal portion (30) of the paper container (1) can be equally and properly heated. |
