| 摘要 |
A slit valve (10) to selectively restrict the passage of a fluent substance between an interior environment (17) and an exterior environment (15) and a method for forming the valve (10), the method including the steps of providing at least one layer of film material and permanently deforming the film material to define a valve (10) for selectively restricting the passage of a fluent substance between an interior environment (17) and an exterior environment (15). |
