Plastic and nonmetallic article shaping or treating: processes – Forming articles by uniting randomly associated particles – Stratified or layered articles
Patent
1990-01-31
1991-12-10
Theisen, Mary Lynn
Plastic and nonmetallic article shaping or treating: processes
Forming articles by uniting randomly associated particles
Stratified or layered articles
264113, 264266, 264293, 425344, 425345, 425352, 425353, 425354, 425385, 6048921, B29C 4304, B29C 4318
Patent
active
050716077
ABSTRACT:
A press is provided for simultaneously pressing and piercing an object. The piercing means moves from a sheathed to unsheathed position in response to compressive pressure. The piercing means are normally biased in the sheathed position by a bias means. Methods and apparatus for piercing an object are disclosed. The press can be used to produce a pierced dispensing device having a compression coating by (a) charging to a die mold a quantity of powder to be compressed; (b) delivering to the die mold an unpierced dispensing device core; (c) charging to the die mold an additional quantity of powder to be compressed; and (d) substantially simultaneously (i) compressing the elements within the die mold to produce a compression coating, and (ii) piercing the compression coating. The compression coating can comprise, for example, a loading dose or a semipermeable membrane.
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Ayer Atul D.
Balkie Hans H.
ALZA Corporatino
Mandell Edward L.
Sabatine Paul L.
Stone Steven F.
Theisen Mary Lynn
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