| 摘要 |
<p>The invention relates to an extrusion head (10) including a cylinder (18) and a mandrel (12), said cylinder coaxially covering said mandrel so as to form an annular chamber (20), said annular chamber having an upstream portion (22) and, opposite said portion, a downstream portion (24) extended by a pair of circular lips (26), said extrusion head (10) including an inlet opening (34) for injecting said soft plastic material which flows into said upstream portion forming a plurality of flows of soft plastic material, said flows being suitable for joining together so as to preform a sleeve of a soft plastic material. Said head includes at least one dispersion grating (32) extending circumferentially between said mandrel (12) and said cylinder (18), and radially from said mandrel to said cylinder, and said sleeve of soft plastic material is forced through said at least one dispersion mating (32) so as to fragment and disperse said soft plastic material.</p> |
