Plastic and nonmetallic article shaping or treating: processes – Mechanical shaping or molding to form or reform shaped article – Shaping against forming surface
Patent
1987-09-14
1988-06-14
Silbaugh, Jan H.
Plastic and nonmetallic article shaping or treating: processes
Mechanical shaping or molding to form or reform shaped article
Shaping against forming surface
249 63, B29D 100
Patent
active
047510366
ABSTRACT:
An improved molded plastic closure having an integral tamper indicating band including a plurality of upwardly and inwardly extending tabs is disclosed. Also disclosed are an improved mold and molding process for the production of such a closure. The closure comprises an upper skirt portion and a lower tamper indicating band formed integrally with the upper skirt portion. Connected to the tamper indicating band and depending upwardly and inwardly therefrom are a plurality of tabs adapted to cooperate with an annular bead provided on a container finish. The tabs are molded in their upwardly and inwardly extending orientation so that free ends of the tabs terminate radially inwardly from an inner surface of the upper skirt portion. A two-piece core is used to form the inner surfaces of the upper skirt portion and the tamper indicating band. The tabs, in their as-molded orientation, are positioned to interfere with the core during removal of the closure therefrom. Such interference is eliminated, however, by a sleeve having tab engaging portions designed to deflect the tabs upwardly and radially outwardly from their molded positions where they will not interfere with the removal of the closure from the core. The core and the sleeve with tab engaging portions are then removed from the closure whereupon the tabs return to their as-molded positions extending upwardly and inwardly from the tamper indicating band through the inherent "memory" of the molded plastic.
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patent: 4526282 (1985-07-01), Dutt et al.
patent: 4552328 (1985-11-01), Dutt et al.
patent: 4592475 (1986-06-01), Hannon et al.
patent: 4622198 (1986-11-01), Gallusser et al.
patent: 4664278 (1987-05-01), Barriac
Fortenberry Jill L.
Owens-Illinois Closure Inc.
Silbaugh Jan H.
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