| 摘要 |
This invention relates to a seal heating method and a seal heating apparatus for heating a seal portion of an opened end part, in order to fold and heat-bond an opened end part at a creased top end part or bottom end part during a paper container assembling operation. Out of opened end parts (1a, 1b) of a paper container (1), an inner seal portion (30a) is opposed to an inner circumferential surface heating element, and an outer seal portion (30b) to outer circumferential surface heating elements (4, 5, 6, 7, 13, 14, 15, 16). At least the inner circumferential surface heating element (8, 17) is swung on its axis so as to vary the positions on the inner seal portion (30a) upon which the hot air ejected from hot air ejection ports (8a) of the inner circumferential surface heating element (8) impinges. This enables a seal portion (30) of the paper container (1) to be heated uniformly and excellently. <IMAGE> |
