Apparatus for controlling wall thickness in extruded tubular synthetic resin blank
OwnerHarald Feuerherminventor
Life of this patent
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Abstract
A mold has a core surrounded by an outer sleeve which defines with the core an annular axially extending passage. An adjustment element in the form of a ring or sleeve is displaceable in this passage so as to vary the radial dimension of a tubular blank that is extruded from the outlet end of the passage. The adjustment ring or sleeve may be elastically deformable by means of hydraulic cylinders or screws so as to create the desired thickness at the desired location, and may even be displaced during operation of the apparatus so as to vary the thickness of the blank from one region to another in the direction in which it is extruded.
Claims10
A shaping nozzle for making a tubular synthetic resin blank for blow molding, said nozzle comprising a core member defining an axis;
- an outer member surrounding said core member and defining therewith an annular passage centered on said axis, having a predetermined generally uniform radial dimension and having an annular axial outlet opening;
- inlet means on one of said members connected to said passage for receiving a solid strand and converting same into a tubular strand in said passage;
- an adjustment element in said passage between said members and defining therein a region of variable radial dimensions different from said predetermined radial dimensions, said adjustment element being an axially elongated flexible ring;
- and a plurality of means for radially displacing individual portions of said flexible ring.
Dependencies are inferred from the claim text.