| 摘要 |
An upper and lower sheet are superimposed and joined along a first lengthwise edge (4) to tender the tubing gas-tight. Inflatable pockets (7a,7b) are formed in a transverse direction by means of spaced apart gas-tight welded seams. The sheets are also continuously joined along a second lengthwise edge (6). The upper sheet has a lengthwise (12) section spaced apart from the lengthwise edges (4,6). |
