| 摘要 |
PROBLEM TO BE SOLVED: To provide a container wherein a container body and a lid which are made of a foaming resin can be always welded in an optimum welded state and an appearance of a welded part is good. SOLUTION: A flange 2a of a container body made of a foaming resin and a lid 3 are interposed between a receive base 12 and an ultrasonic horn 10, wherein a distance H between the receive base 12 and the horn 10 is kept constant. As a result, a distance between a pressurized end face 10a of the horn 10 and an aligned face 5a is always constant, so that no fluctuation occurs in ultrasonic energy applied to the aligned face 5a thereby obtaining uniform welding quality. |
