Abstract 1. In a blow molding process for forming a container having a raised bottom wall by expanding a thermoplastic parison against the surface of a chamber defined by portions of partible blow mold sections when in closed position, and then moving at least a portion of the chamber surface defining the raised bottom wall away from the chamber to facilitate removing the container from the chamber, the improvement which comprises moving said sections toward and away from each other perpendicular to the axis of a circular path in a vertical plane to close and open such sections as they traverse said path, drawing a portion of the container bottom wall across a movably mounted corresponding portion of the chamber surface which defined said bottom wall portion, during opening of said partible sections to urge said corresponding portion of the chamber surface out of the way of the bottom wall portion as the container is being extracted from the mold section containing said movably mounted chamber surface portion, and then moving said chamber surface portion in the opposite direction under the influence of gravity only to a container-forming position at a predetermined position on said circular path prior to closing said sections.
In a blow molding process for forming a container having a raised bottom wall by expanding a thermoplastic parison against the surface of a chamber defined by portions of partible blow mold sections when in closed position, and then moving at least a portion of the chamber surface defining the raised bottom wall away from the chamber to facilitate removing the container from the chamber, the improvement which comprises moving said sections toward and away from each other perpendicular to the axis of a circular path in a vertical plane to close and open such sections as they traverse said path, drawing a portion of the container bottom wall across a movably mounted corresponding portion of the chamber surface which defined said bottom wall portion, during opening of said partible sections to urge said corresponding portion of the chamber surface out of the way of the bottom wall portion as the container is being extracted from the mold section containing said movably mounted chamber surface portion, and then moving said chamber surface portion in the opposite direction under the influence of gravity only to a container-forming position at a predetermined position on said circular path prior to closing said sections.
Claim 2
Dependent Claim
200 words
In a blow molding process for forming a container having a raised bottom wall by expanding a thermoplastic parison against the surface of a chamber defined by portions of partible blow mold sections when in closed position, and then moving at least a portion of the chamber surface defining the raised bottom wall away from the chamber to facilitate removing the container from the chamber, the improvement which comprises moving said sections toward and away from each other perpendicular to the axis of a circular path in a vertical plane to close and open such sections as they traverse said path, drawing a portion of the container bottom wall across a movably mounted corresponding portion of the chamber surface which defined said bottom wall portion, during opening of said partible sections to urge said corresponding portion of the chamber surface out of the way of the bottom wall portion as the container is being extracted from the mold section containing said movably mounted chamber surface portion, and then moving said chamber surface portion in the opposite direction under the influence of gravity only to a container-forming position at a predetermined position on said circular path prior to closing said sections.