Vacuumized plastic cap for heat insulating containers |
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| 申请号 | US38974873 | 申请日 | 1973-08-20 | 公开(公告)号 | US3856172A | 公开(公告)日 | 1974-12-24 |
| 申请人 | DOW CHEMICAL CO; | 发明人 | WALLES W; | ||||
| 摘要 | 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. | ||||||
| 权利要求 | 1. A VACUUM PLASTIC CAP COMPRISING ENCAPSULATING BOUNDARY WALL OF A NORMALLY SOLID PLASTIC MATERIAL COMPLETELY ENCLOSING AN EVACUATED SPACE, A LAYER OF METAL ON AT LEAST ONE ENTIRE SURFACE OF SAID BOUNDARY WALL, AN OVERCOATING OF A BARRIER 2. The plastic cap of claim 1 wherein the metal layer is on the surface of the boundary wall which is most proximate to the enclosed space. 3. The plastic cap of claim 1 wherein the barrier plastic exhibits a permeance to gases of the atmosphere of less than about 0.9 cc/100 sq. in./mil/day. 4. The plastic cap of claim 1 wherein the barrier plastic is a vinylidene chloride copolymer. 5. The plastic cap of claim 1 wherein the metal is silver. 6. The plastic cap of claim 1 wherein the gas absorbing material comprises activated charcoal in the form of a solid particulate. 7. The plastic cap of claim 1 wherein the normally solid, plastic material is polypropylene. |
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