Bead seal for oriented articles

Claim 2

Apparatus for sealing and severing an open end tube comprising in combination: neck forming means for gripping a first end of said tube; sealing and severing means for gripping a second end of said tube; means for effecting relative axial movement between said means for gripping said first end and said means for gripping said second end so as to stretch said tube longitudinally; a pair of opposed mold halves carrying said sealing and severing means, said mold halves being movable transversely to the axis of said tube into and out of engagement, each of said mold halves having a forwardmost extension in the form of a severing edge of said sealing and severing means, said extensions coming toward each other into cooperative opposed relationship as said mold halves are moved into engagement; an elongated bead-forming cavity, one side thereof being formed by said severing edge; and a stem-forming surface, which begins at an edge of said cavity which is opposite said severing edge and which terminates at a narrow longitudinal bottom wall-forming surface, said beadforming cavity, stem-forming surface and narrow bottom wallforming surfaces all projecting beyond an adjacent general bottom wall-forming surface of said mold toward said neck forming means, said narrow bottom wall-forming surface and said general bottom wall-forming surface being parallel to a longitudinal direction of said bead-forming cavity.

Claim 3

Apparatus according to claim 1 wherein said mold halves form a bottle mold.

Claim 4

Apparatus according to claim 1 wherein said general bottom wall-forming surface terminates at an outward end thereof in a surface which slopes downwardly and outwardly to give a flat annular bottom wall-forming surface around the periphery of the article being molded.

Claim 5

Apparatus according to claim 1 wherein said narrow bottom wall-forming surface adjacent said stem-forming surface has a width of 0.0004 to 0.06 times the average diameter of the entire bottom-forming portion of said mold.

Claim 6

Apparatus according to claim 1 wherein said narrow longitudinal bottom wall-forming surface projects above said general bottom wall-forming surface an amount equal to 0.006 to 0.2 times the average diameter of the entire bottom-forming portion of said mold.

Claim 7

Apparatus according to claim 1 wherein said narrow wall-forming surface adjacent said stem-forming surface has a wiDth of 0.01 to 0.04 times the average diameter of the entire bottom wall-forming portion of said mold and projects above said general bottom wall-forming surface an amount equal to 0.02 to 0.1 times the entire bottom wall-forming portion of said mold.

Claim 8

Apparatus according to claim 1 wherein said narrow bottom wall-forming surface adjacent said stem-forming surfaces is curved to give a narrower and deeper recess in the central portion of the resulting article.

Claim 9

Apparatus according to claim 1 wherein said stem-forming surfaces are curved so as to give a thicker stem in the central portion of said molded article.

Claim 10

Apparatus according to claim 1 wherein said stem-forming surfaces slope back away from said bead-forming cavity.

Claim 11

Apparatus according to claim 9 wherein said stem-forming surfaces slope back at an angle of 1* to 25* from a line parallel to a parting plane of said mold.

Claim 12

Apparatus for sealing and severing an open end tube comprising in combination: neck forming means for gripping a first end of said tube; sealing and severing means for gripping a second end of said tube; means for effecting relative axial movement between said means for gripping said first end and means for gripping said second end so as to stretch said tube longitudinally; a pair of opposed mold halves adapted to move into and out of engagement, said mold halves carrying said sealing and severing means, the forwardmost extension of said sealing and severing means comprising a severing blade, said extensions coming toward each other into cooperative opposed relationship as said mold halves are closed, each of said sealing and severing means further having a recess adjacent said blade which in cooperation with a corresponding recess in the other mold part forms an elongated bead-forming mold cavity, and opposed stem-forming surfaces between said bead-forming mold cavity and a bottom wall-forming surface of said mold halves, said bottom wall-forming surface being parallel to a longitudinal direction of said elongated bead-forming mold cavity in said sealing and severing means, said stem-forming surfaces sloping back from said bead-forming mold cavity so that a distance between said stem-forming surfaces is greater at a point adjacent said bottom wall-forming surface than a corresponding distance at a point adjacent said elongated recesses, said sloping stem-forming surfaces constituting a substantial portion of a distance between said blade and said bottom wall-forming surface.

Claim 13

Apparatus for sealing and severing an open end tube comprising in combination: neck forming means for gripping a first end of said tube; sealing and severing means for gripping a second end of said tube; means for effecting relative axial movement between said means for gripping said first end and means for gripping said second end so as to stretch said tube longitudinally; a pair of opposed mold halves adapted to move into and out of engagement, said mold halves carrying said sealing and severing means, the forwardmost extension of said sealing and severing means comprising a severing blade, said extensions coming toward each other into cooperative opposed relationship as said mold halves are closed, each of said sealing and severing means further having a recess adjacent said blade which in cooperation with a corresponding recess in the other mold part forms an elongated bead-forming mold cavity, and opposed stem-forming surfaces between said bead-forming mold cavity and a bottom wall-forming surface of said mold halves, said bottom wall-forming surface being parallel to a longitudinal direction of said elongated bead-forming mold cavity in said sealing and severing means, said stem-forming surfaces sloping back from said bead-forming mold cavity so that a distance between said stem-forming surfaces is greater at a point adjacent said bottom wall-forming surface than a corresponding distance at a point adjacent said elongated recesses, said sloping stem-forming surfaces constituting a substantial portion of a distance between said blade and said bottom wall-forming surface.

Claim 14

Apparatus according to claim 11 wherein said surfaces slope back at an angle of 1* to 25* relative to a line parallel to closing plane of said mold halves.