| 摘要 |
The invention relates to an extrusion head and to a method, by way of which for example the thickness distribution of hollow bodies can be further improved. To this end, the extrusion head consists of at least one mandrel (1) and a nozzle (2), which mandrel (1) and nozzle (2) may be geometrically rigid and thus not changeable or else deformable in a regionally flexible manner and which form a flow duct (3), wherein the mandrel (1) and the nozzle (2) are positionally changeable in relation to one another, as a result of which the geometry of an outlet gap (s) of the flow duct (3) is changeable during the discharge of a melt, wherein each head part has at least one head section having a constant cross-sectional area in an outlet region (A) of the extrusion head, and wherein at least one head part has at least two head sections (B) and (C) which each have predominantly constant cross-sectional areas within the head section (B), (C), are axially spaced apart and have different cross-sectional areas from one another. |
