| 摘要 |
<p>The device comprises at least one tubular moulding column (1), at the base of which is a horizontally moving shutoff knife (3) surmounting a shaper (5) and a horizontally moving lower shutoff (9). The side wall (6) of the shaper (5) comprises vertical slits (6) which are open at the lower end. The lower shutoff (9) is pierced by discontinuous slits (12) following a closed line corresponding to the horizontal cross section of the shaper (5), the slits (12) of the lower shutoff being separated from each other by solid parts (13) underneath the vertical slits (7) of the shaper. The lower shutoff (9), which may be formed by two shutoff halves (10), can thus be moved vertically also, sliding freely within the shaper (5), to a raised position adjacent to the shutoff knife (3). <IMAGE></p> |
