摘要 |
The invention relates to an extrusion head (10) inciuding a cylinder (18) and a mandrel (12), said cylinder coaxially covering said mandrel so as to form an an nular 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) inciuding an inlet opening (34) for injecting said soft plastic material which flows into said upstream portion forming a plural ity 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 grating (32) SO as to fragment and disperse said soft plastic material.
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