| 摘要 |
A one-way degassing valve for containers (1) made of cardboard or comprising at least one wall (2) or portion of wall of cardboard (6), wherein a hollow or depression (21) forming an inner protrusion (22), beneath which is disposed an impermeable diaphragm (23) held in position by an aluminium film (8) having at least one hole (26) coinciding with the area of said diaphragm (23) and bonded to said layer of cardboard (6) in an area outside the area of said diaphragm (23), such as to leave at least one track of non-bonding (25), communicating with a cut (10), made in said layer of cardboard (6), so as to allow communication between the inside and the outset of the container (1), through said at least one hole (26) in the aluminium sheet (8), the area of non-bonding around the diaphragm (23), said at least one track of non-bonding (25) and said cut (10).
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