| 摘要 |
A one-way pressure-relief valve (4) applicable to a package (1) which contains a gas releasing product, said package (1) comprising walls defining a package structure for said product, one of such walls (2) bearing at least one orifice (3) for gases to be expelled, on which orifice the one-way valve (4) is applied, valve (4) comprising a thin flexible bottom sheet (5) provided with an opening (7) and a thin flexible top sheet (6) overlapping bottom sheet (5), wherein bottom sheet (5) is attached to the top sheet (6) in a region defined by the edge of valve (4) and a closed perimeter (7'), the closed perimeter (7') being defined on a substantially central region of valve (4), surrounding opening (7); a portion of closed perimeter (7') being located substantially near a portion of the perimeter of opening (7), defining a first sector (8) within which a gas medium is enclosed, and the remaining portion of closed perimeter (7') is located substantially apart from the remaining portion of opening (5) perimeter, defining a second sector (9) within which a fluid medium is enclosed; and wherein top sheet (6) bears at least one micro-perforation (10) in a region of the surface thereof which is located above second sector (9). Also disclosed is package (1) which contains the one-way valve (4).
|
