Plastic and nonmetallic article shaping or treating: processes – Mechanical shaping or molding to form or reform shaped article – To produce composite – plural part or multilayered article
Patent
1976-04-21
1978-05-09
Arnold, Donald J.
Plastic and nonmetallic article shaping or treating: processes
Mechanical shaping or molding to form or reform shaped article
To produce composite, plural part or multilayered article
264291, B29C 1302
Patent
active
040887308
ABSTRACT:
A plunger for forming thermoplastic material disposed in a closure shell into a closure insert with a cushion pad or bead by sealing the material between the crown and working surface of the plunger and flexing a portion of the working surface to form the material into the desired shape. The plunger includes a punch, elastomeric material and a sealing means. In one embodiment, the plunger comprises a reciprocal punch having a lower end surrounded by cylindrically-shaped elastomeric material, and sealing means that is disposed about the outer wall of the elastomeric material and has a lower ledge contacting the bottom surface of the elastomeric material. A spring means maintains the elastomeric material in sealing engagement with the punch and sealing means, and maintains the punch, elastomeric material, and sealing means in mechanical engagement. The outer diameter of the lower portion of the plunger is less than the inner diameter of the sealing means to provide a gap therebetween, which facilitates in the alignment of the closure shell beneath the plunger, and enables the sealing means to move relative to the plunger to accommodate any skewness between the plunger and the closure shell.
REFERENCES:
patent: 2840858 (1958-07-01), Rainer et al.
patent: 2881480 (1959-04-01), Waters
patent: 3101992 (1963-08-01), Cooke et al.
patent: 3444281 (1969-05-01), Cahill et al.
patent: 3564602 (1971-02-01), Peck
Arnold Donald J.
H-C Industries Inc.
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