| 摘要 |
A label type degassing valve with a vented flexible cover and a base with a central aperture. The base is adhered to the cover with an adhesive layer or coating that is positioned and shaped not to interfere with the vents. The vents are generally positioned off center in the cover. For the adhesive coating, there is a deactivated central region of the coating facing the base so that no part of the deactivated central region is adhered to the base and at least one of the vents is cut through the cover and through the deactivated central region. |
