| 摘要 |
Thin-walled, nestable, generally cup-shaped preform or parison of thermoplastic material having a protuberance on its bottom wall portion which provides a transversely extending, generally lateral facing ridge surface for use in pivotally orienting the parisons as they are conveyed one-at-a-time at relatively high speed into a blow-molding machine for final forming to non-nestable container shape; parisons have localized printed or thickened surface areas, and such pivotal orienting causes these areas to face precisely, as desired, with respect to particular local surface areas of machine mold cavity in which they are received; screw type conveyor moves single line of upright parisons laterally toward machine, urging their respective bottom ridge surfaces against fixed aligning track which promotes desired pivotal movement of each parison and retains resulting alignment; vacuum applied through machine mandrel by which each parison is picked up and held promotes any necessary final, incremental orienting as parison bottom ridge seats itself against transversely extending, mating configuration on mandrel bottom; alternative parison embodiments respectively provide downwardly or upwardly projecting bottom ridge.
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