Patent ID: 8758003

Claim:
An extrusion head comprising: a conduit; a central mandrel extending within the conduit for supporting an inner die portion of a set of dies that has inner and outer die portions; an upstream spider and a downstream spider, each having webs supporting the central mandrel at axially spaced apart positions, the webs of the upstream and downstream spiders having web portions that are axially offset from each other to promote mixing of polymer flowing through the conduit, the downstream spider having radially inner web portions and radially outer web portions which are separated from each other by an annular ring portion, the radially inner web portions being angularly spaced from the radially outer web portions in an offset manner to promote flow separation and mixing that is locationally angularly different in adjacent annular regions, at least a part of said web portions of the downstream spider extending radially outwardly relative to the webs of the upstream spider to be radially outwardly offset thereof.