| 摘要 |
PROBLEM TO BE SOLVED: To provide a paper container with a synthetic resin-made ring which has no generation of pinholes in a synthetic resin layer of a joint where both ends of a laminated material forming the barrel part of a container body are overlapped when the synthetic resin-made ring is jointed on the opening part of the container body, and has a stable quality.SOLUTION: In the paper container with the synthetic resin-made ring having the container body having a laminated part in which a paper layer is the main material and the innermost layer consists of a laminated material of a synthetic resin layer and both side end parts of the laminated material are overlapped, and prepared by jointing the synthetic resin-made ring having the peripheral wall and the flange part extending outward from the peripheral wall on the opening part of the container body by ultrasonic welding, the synthetic resin-made ring is welded and fixed under a condition that a gap is provided between the undersurface of the flange part and the upper end of the opening part of the container body. |
