| 摘要 |
<p>Flexible tubular sheet material (10) of polymeric material is supplied to a first position (for instance between rollers 11) in a flat form and is helically cut by blade (18) to form a cut strip that is drawn away by a unit (20). The flat strip is drawn from the first position and is opened to a tubular form and is then drawn over a mandrel (14), where it is cut. Preferably it is inflated by air from a blower (13).</p> |
