| abstract |
Heat insulative properties of vacuum containers such as vacuum bottles are significantly improved by stoppering the container with a vacuumized plastic cap having a boundary wall of structural plastic material wherein the inner surface of the boundary wall is coated with a thin metallic layer and a layer of barrier plastic such as a vinylidene chloride copolymer and which encloses an evacuated space filled with a gas absorbing material such as activated charcoal. |