| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for manufacturing a resin bottle container having high-grade appearance, which prevents occurrence of a protruded stripe at the outer surface of a welded part due to heat generation in welding by laser beam.SOLUTION: A resin bottle container 1 made of resin such as polyester includes a neck part 2, a trunk part 3, and a bottom part 4. The protrusion 6 of the trunk part 3 and the notched concave part 5 of the neck part 2 are joined. A heat-resistant annular body 7 having optical transparency is closely attached to a part corresponding to a welding part 8 so as to form a covering. The welding part 8 is irradiated with laser beam through the annular body 7 so as to be welded. |
