| 摘要 |
<p>A band (11) is wound around a tube (10). Bevelling is then formed on each side of the band, and the band is then fed via shaping rollers. In this way, a base part (11a) is formed on the band and folded upper parts (11b1, 11b2) from which needle-shaped strips (11c1, 11c') extend at an angle to one another.</p> |
