Patent Number: 6,168,414

Title: Apparatus for cryogenic stretch blow molding

Abstract: A cryogenic stretch blow molding apparatus including a stretching rod mounted to a blow mold rod seal assembly for sliding movement therethrough, into and longitudinally stretching a plastic parison, the stretching rod including a cooling fluid tube defining a cooling fluid inlet port for connection to a source of a cooling fluid and a cooling fluid outlet port to introduce the cooling fluid within the container, and a heater disposed in a cavity defined in the blow mold rod seal assembly for heating the blow mold rod seal assembly so that at least a portion of the stretching rod is maintained at a temperature above a preselected level to prevent accumulation thereon of ice sublimated from water vapor present in the blow air and portions of seals of the blow mold rod seal assembly are maintained at a temperature above a predetermined level to prevent seal failure. A method of stretch blow molding a plastic parison mounted to a parison engagement assembly into a container including stretching the parison by sliding the stretching rod therethrough and into the parison, connecting the cooling fluid inlet port to the source of cooling fluid to introduce the cooling fluid within the container through the cooling fluid outlet port, and heating the blow mold rod seal assembly to maintain at least a portion of the stretching rod above the preselected level, and to maintain portions of seals above the predetermined level.

Inventors: Oas; David C. (Vandalia, OH)

Assignee: Electra Form, Inc.

International Classification: B29C 49/66 (20060101); B29C 49/64 (20060101); B29C 49/58 (20060101); B29C 35/00 (20060101); B29C 35/02 (20060101); B29C 35/16 (20060101); B29C 49/12 (20060101); B29C 49/08 (20060101); B29C 049/12 (); B29C 049/66 ()

Expiration Date: 01/02/2018