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US 3,942,932 AGranted
Sealing parisons using preblow and contoured sealing surface
AssigneePhillips Petroleum Company
InventorDixie E. Gilbert
Life of this patent
Estimating the term…
Abstract
An open end parison preform is stretched longitudinally, expanded slightly with preblow fluid, and pinched shut with a contoured sealing member to form a bead along the sealing seam.
Claims5
Apparatus for sealing and severing an individual open end tube comprising in combination:
- means for gripping a first end of said tube;
- means for gripping a second end of said tube;
- means for effecting a relative movement between said means for gripping said first end and said means for gripping said second end;
- means to introduce preblow fluid into the interior of said tube;
- a pair of opposed mold halves movable transversely to the axis of said tube into and out of engagement, each of said mold halves having matching severing edges, each of said mold halves having a bead-forming and holding cavity between said severing edges and a bottom wall-forming surface of each of said mold halves.
2 more elements
Dependencies are inferred from the claim text.