| 摘要 |
A closure ( 1 ) for flexible packaging ( 2, 3 ) with a floating valve ( 5 ) which is a situated within the cap ( 4 ). The cap ( 4 ) is provided with holes ( 14 ) to allow for escape of air. The valve ( 5 ) may incorporate a spring ( 15 ) to regulate flow of air upon collapse of container ( 2, 3 ).
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