| 摘要 |
<p>An improved apparatus and method for releasing excess gas from a container. The container has a gas tight wall which forms a product containing cavity, an outer wall and a one way valve for allowing gas to leave the cavity. The valve has a first perforated layer which forms part of the gas tight wall of the cavity, a second perforated layer which forms part of the outside of the container. The first perforated layer and the second perforated layer are joined together such that an enclosed volume is formed between the first perforated layer and the second perforated layer. The gas tight layer prevents the flow of gas from the container when in a first position and allows gas to move through the valve when in a second position. The second position if the layer is caused by overpressure in the cavity.</p> |
