One-piece dispensing structure and method and apparatus for making same
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United States of America Patent
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-
Oct 23, 2001
Grant Date -
N/A
app pub date -
Jan 12, 1999
filing date -
Jan 12, 1999
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A one-piece dispensing structure is molded by a process combining a co-injection molding first phase with a bi-injection molding second phase. In the first phase, a skin material and core material are co-injected into a mold cavity first region to form most of the major portion of the closure body. Subsequently, a movable shut-off member is retracted to expose an intermediate region which (1) is adjacent the closure structure hinge area and which (2) establishes communication between the mold cavity first region and another part of the mold cavity defining the closure lid portion. The skin material is injected through a second gate directly into the cavity intermediate region to fill the cavity intermediate region and the closure lid portion of the mold cavity. The skin material in the cavity intermediate region bonds to the previously injected skin material in the cavity first region adjacent the closure hinge.
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