| 摘要 |
<p>A self-venting cover (1) for a heatable food package comprises a sheet of film (3) having a slit (5) formed therein to permit the passage of steam therethrough. A label (4) is secured to the film (3) for controlling the flow of steam through the opening, the label (4) comprising a sheet of material having a first region (7) secured to the film in an area remote from the slit (5) and having a second elongated (6) region covering the slit (5). The elongated region (6) is only partially secured to the film (3) and forms a vent passage (11, 12) between the unsecured portion (10) of the elongated region (6) and the film (3) itself, which vent passage (11, 12) extends from the slit (5) towards the peripheiy of the label to permit controlled venting of steam from the opening.</p> |
