| 摘要 |
A closure device for canisters and a reclosure for vacuum pack containers and comprised of a removeable diaphragm that seals with the opened end of the container and a cover overlying the diaphragm to form a pump chamber therebetween, there being actuating means to axially reciprocate the diaphragm relative to the cover, and check valves in the diaphragm and cover for drawing a high vacuum upon the contents within the said container, and with means to release said vacuum.
|
