| 摘要 |
<p>A disposable dust-collecting bag consisting of a mat which has been folded once in its transverse direction and consists of several layers of separate strips of non-woven fibrous web laid in parallel relationship in each layer and so that the strips of non-woven fibrous web in one layer are laterally displaced with regard to the strips of non-woven fibrous web in the adjacent layer or layers.</p> |
