B - Operations – Transporting – 29 – D
Patent
B - Operations, Transporting
29
D
18/711, 18/916
B29D 23/00 (2006.01) A61M 25/00 (2006.01) B28B 1/24 (2006.01) B28B 7/16 (2006.01) B29C 33/00 (2006.01) B29C 33/30 (2006.01) B29C 45/36 (2006.01)
Patent
CA 1048214
APPARATUS AND PROCESS FOR MOLDING OF HOLLOW ARTICLES Abstract of the Disclosure Disclosed is an apparatus and process for the mold- ing of hollow articles such as full length Foley catheters. The apparatus preferably comprises a mold with two lumen forming wires longitudinally disposed therein. A set of two receiving wires are spaced distally from the distal ends of the lumen forming wires and are longitudinally aligned there- with. A first follower is slidably disposed about the lumen forming wires in close abutment with the wires and inside wall of the mold. The first follower is preferably disposed toward the proximal end of the mold and preferably at least two other followers are provided spaced distally of the first follower. One of the other followers preferably bridges the space bet- ween the lumen forming wires and receiving wires. Sets of gates are preferably provided along the length of the mold in fluid communication with a source of molding material. In practice, molding material is injected into the molding channel at the proximal end of the mold and flows longitudi- nally toward the distal end of the mold while pushing the first follower along the wire ahead of it. As the follower proceeds toward the distal end of the mold, it engages and pushes the remaining followers toward the distal end of the mold. At the beginning of the molding process, each set of gates has a follower that is transversely aligned with it so as to seal the set of gates and prevent the flow of molding material through the set of gates and into the mold. In this fashion, molding material is not introduced through a set of gates and into the mold until all followers are distally located from the set of gates.
260101
Quick James R.
Wittosch William A. (jr.)
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