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US 8,968,636 B2Granted
Stretch rod system for liquid or hydraulic blow molding
AssigneeDiscma AG
InventorTheodore F. Eberle
Life of this patent
Estimating the term…
Abstract
A mold device and a method related thereto for forming a plastic container from a preform. The mold device comprises a mold defining a mold cavity, a stretch initiation rod system for engaging an interior portion of the preform to define a stretch initiation area, and a centrally disposed pressure source positionable within the preform for introducing a pressurized fluid.
Claims15
A method of forming a plastic container from a preform, said method comprising:
- heating a preform to a temperature between 190° F. and 250° F.;
- heating a mold cavity to a temperature between 250° F. and 350° F.;
- inserting said preform within said mold cavity;
- actuating a stretch initiation rod system to engage an interior portion of the preform to define a stretch initiation area;
- introducing a pressurized fluid into said preform to expand said preform to closely conform to said mold cavity;
- and
- actuating a central exterior rod such that a locating feature formed on said central exterior rod engages an exterior feature of said preform to generally maintain a predetermined orientation of said preform during at least a portion of said introducing said pressurized fluid.
4 more elements
A method of forming a plastic container from a preform, said method comprising:
- heating a preform;
- inserting said preform within a mold cavity having a central longitudinal axis;
- introducing a pressurized liquid into said preform to expand said preform to closely conform to said mold cavity;
- and
- actuating a central exterior rod such that a locating feature formed on said central exterior rod engages an exterior feature of said preform to prevent said preform from slipping off said central exterior rod and to generally maintain a concentricity of said exterior feature of said preform with respect to said cavity central longitudinal axis during at least a portion of said introducing said pressurized liquid without substantial modification of said exterior feature of said preform.
2 more elements
Dependencies are inferred from the claim text.