| 摘要 |
PROBLEM TO BE SOLVED: To provide a heat insulation container capable of performing vacuum drawing reliably, causing no vacuum leakage, reducing defects remarkably, and achieving favorable heat insulation efficiency.SOLUTION: An inner cylinder 2 of a container body includes a step-less and flat straight part 2a spread from a center toward an outer side and formed integrally on a bottom part. A bottom plate 4 includes: a bottom plate straight part 4a joined with a lower side of the straight part 2a of the inner cylinder 2 and treated with spot welding in a shape radiated from a center; and a second annular suspended wall part 4b suspended downward on an outer peripheral edge of the bottom plate straight part. An outer cylinder 3 includes: an outer cylinder annular part 3a extended horizontally from a lower edge toward an inner side; and a first annular suspended wall part 3e suspended downward at a tip of the outer cylinder annular part and joined with a lower outer wall of the second annular suspended wall part 4b of the bottom plate. A bottom cover 5 is placed for covering while facing upward together with a packing 11 covering the second annular suspended wall part 4b of the bottom plate and the first annular suspended wall part 3e of the outer cylinder to be joined in an upward facing direction from a lower side.SELECTED DRAWING: Figure 9 |
