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US 5,662,842 AGranted
Process for blow molding hollow objects with independent movement of mold halves
AssigneeSalflex Polymers Ltd.
InventorsChangize Sadr, Roger Elgner
Life of this patent
Estimating the term…
Abstract
In a blow molding process the mold halves are independently controlled and moved so that a parison may be extruded from an extrusion head and then one of two mold halves may be moved toward the parison. The parison may be grasped by a manipulator to manipulate a portion of the parison so as to overlie a second portion of the mold cavity. The mold is then closed and a standard blow molding procedure performed. The process enables production of reduced flash.
Claims18
A process for making a blow molded product comprising:
- i) extruding a parison from an extrusion head so that said parison hangs from said extrusion head substantially vertically and substantially between first and second complimentary mold halves;
- ii) independently controlling first and second complimentary mold halves;
- iii) moving one of said mold halves independently of the other of said mold halves, toward the other of said mold halves from a mold open position toward a mold closed position until at least a portion of said mold half is in contact with a portion of said parison;
- iv) grasping at least one first portion of said parison in a manipulator and manipulating said portion of said parison after a second portion of said parison is contacted by one of said mold halves said manipulation step occurring before blow moulding said product and said manipulation of said parison being in a direction other than a direction in or parallel to the vertical plane containing the direction of mold closure;
- v) closing said mold halves over said parison to create a closed mold, and
- vi) blow molding said product in said closed mold.
3 more elements
A process for making a blow molded product comprising:
- i) extruding a parison from an extrusion head so that said parison hangs from said extrusion head substantially vertically;
- ii) independently controlling first and second complimentary mold halves;
- iii) moving one of said mold halves independently of the other of said mold halves, toward the other of said mold halves from a mold open position toward a mold closed position;
- iv) grasping at least one first portion of said parison in a manipulator and manipulating said portion of said parison after a second portion of said parison is contacted by one of said mold halves said manipulation step occurring before blow moulding said product and said manipulation of said parison being in a direction other than the direction of mold closure;
- v) closing said mold halves over said parison to create a closed mold, and
- vi) blow molding said product in said closed mold and wherein said process further includes providing in each said mold half, at least one independently movable section and said process further comprises closing said mold halves so that the parting faces of said mold halves are in contact with one another, and then manipulating said parison in the region of said independently movable sections, then completely closing said mold by moving said independently movable sections and then blow molding said product.
3 more elements
Dependencies are inferred from the claim text.