Blow Molding Techniques
OwnerBoaz Barry Gromaninventor
Life of this patent
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Abstract
In blow mold apparatus, the emergence of a parison from an extruder may be controlled (the parison supported), such as by pulling on the parison or resisting gravity pull to tailor parison wall thickness, overall and locally. The process may proceed discontinuously, such as by stopping extrusion before a parison has achieved its full desired length and continuing pulling. After molding the parison, it may be filled with a material (solid, liquid or gas). A subsequent parison may be molded onto a previously formed parison. Various elements or devices (such as needles, caps, stoppers, valves, plungers) may be incorporated into the part during the molding process.
Claims25
Method of blow molding a part, comprising extruding a parison;
- characterized by supporting the parison as it is being extruded.
Method of blow molding a part, comprising:
- extruding a first parison;
- and
- inflating the first parison into a cavity of a first mold;
- characterized by:
- extruding a second parison onto an end of the molded first parison;
- and
- inflating the second parison into a second mold.
An overall process for blow molding a part, comprising:
- extruding a parison;
- stopping extruding;
- and
- molding the parison.
Blow molding method comprising:
- extruding a parison having a length and a thickness;
- and
- controlling the thickness of the parison, as it is being extruded.
Blow molding apparatus comprising:
- an extruder;
- and
- a mold;
- characterized by:
- means for supporting a parison during extruding.
Dependencies are inferred from the claim text.