| 摘要 |
The air-permeable bag material on the outside is covered by the air-impermeable material of the outer wall, forming a closed air chamber to the atmosphere, with the exception of a venting aperture. The air chamber (11) is provided with a venting valve in the form of a valve hose (12) limiting in a channel fashion the venting aperture. The one end (13) of the valve hose for carrying out a venting issues freely into the air chamber and its other end (14), after completion of a venting process, forms a closure area tightly closable from the outside. |
