| 摘要 |
<p>This invention relates to an apparatus for the simultaneous extrusion of a plurality of tubular parisons, each extruded through annular, variably dimensionable extrusion orifices aligned in a single plane and receiving plasticized material from a melt system, with the walls of each tubular parison being identically varied by simultaneous and identical variations of each annular orifice dimension. Each orifice is defined by relatively axially displaceable mandrel and bushing elements. A beam elongated in the single plane of the extrusion orifices and outside of the melt system supports the displaceable element of each orifice and is restrained for axial movement in the orifice plane by the displaceable orificedefining elements. Axially reciprocating the beam toward and away from the orifices varies the dimension of each extrusion orifice simultaneously and identically.</p> |
