| 摘要 |
The disposable pressure preservation cap has four components. This one piece moulded cap has an internal screw thread and lip incorporated in the moulding. At the top is a rip cord designed to facilitate the removal of the top of the cap. At the bottom is a moulded first use seal similar to those commonly used. This is a moulded rubber like diaphragm with a hole at its top and a lip at its bottom designed to wrap around the top of component three. This is a moulded plastic cup with a lip at its top and a moulding at the bottom to accommodate component four. This is a moulded rubber like flexible plug with a cone shaped nib in its centre and ventilation holes between the centre and outside edge. Pumping air into a container using the cap increases the air pressure inside the container and reduces the gas lost by the liquid. The cap may be provided with two diaphragms, the first to pump air and the second to form a one way valve. |
