| 摘要 |
<p>The invention relates to an extrusion head for producing hose- or pipe-shaped preforms from extrudable plastics. The preforms are preferably composed of several layers. The extrusion head has a plurality of distributors which are combined to form units. Each unit includes four distributor discs (29 to 32) contacting one another via contact faces (33 to 38). The contact faces constitute planes perpendicular to the longitudinal axis (26). In the region of the contact faces of the distributor discs (29 to 32) a feeding channel is arranged with two passages which provide connections with two partial channels (43, 44). The partial channels are also arranged between the distributor discs (29 to 32) or the separating planes therebetween. Each end in one portion in the plane in which the central distributor discs (31, 32) contact one another form an annular exit gap (53). In this way it is possible to achieve a modular system and an assembly which is axially short. The assembly is also compact in the radial direction.</p> |
