초록 ▼

A molding apparatus and method of injection, compression or otherwise molding a closure having projections extending inwardly from a skirt of the closure includes a plurality of slides for movement obliquely with respect to an inner mold core. A ring contacts the closure and surrounds the slides. Mo

A molding apparatus and method of injection, compression or otherwise molding a closure having projections extending inwardly from a skirt of the closure includes a plurality of slides for movement obliquely with respect to an inner mold core. A ring contacts the closure and surrounds the slides. Movement of the ring relative to the mold core results in the movement of the closure which moves the slides to disengage recesses on the slides. The recesses are used to form the projections on the closure. The ring contacts the closure and advances the closure away from the mold core. The projections seated within the recesses on the slides move the slides obliquely relative to the mold core and ultimately disengage the recesses from the projections thereby releasing the closure from the mold. The movement of the slides is independent from the movement of the ring so that complicated mechanisms for movement of the slides are not required according to this invention.

대표청구항 ▼

A molding apparatus and method of injection, compression or otherwise molding a closure having projections extending inwardly from a skirt of the closure includes a plurality of slides for movement obliquely with respect to an inner mold core. A ring contacts the closure and surrounds the slides. Mo

A molding apparatus and method of injection, compression or otherwise molding a closure having projections extending inwardly from a skirt of the closure includes a plurality of slides for movement obliquely with respect to an inner mold core. A ring contacts the closure and surrounds the slides. Movement of the ring relative to the mold core results in the movement of the closure which moves the slides to disengage recesses on the slides. The recesses are used to form the projections on the closure. The ring contacts the closure and advances the closure away from the mold core. The projections seated within the recesses on the slides move the slides obliquely relative to the mold core and ultimately disengage the recesses from the projections thereby releasing the closure from the mold. The movement of the slides is independent from the movement of the ring so that complicated mechanisms for movement of the slides are not required according to this invention. molding a closure having a skirt extending downwardly from a panel and a plurality of interrupted projections extending inwardly from the skirt, the method comprising: introducing closure material into a mold cavity formed by an outer mold and an inner mold, the inner mold having a core and a plurality of spaced slides each having at least one recess on an outer face thereof for forming the projections on the skirt, the slides being mounted on the core for movement relative to the core in a direction obliquely oriented with respect to a longitudinal axis of the core, a ring surrounding a portion of the core; providing an undercut surface in the recesses to form corresponding undercut surfaces on the projections; removing the outer mold from the closure seated on the inner mold; contacting the closure with the ring; moving the ring parallel to the longitudinal axis of the core and away from the core and thereby removing the closure from the core; and moving the slides inwardly toward the longitudinal axis of the core using the movement of the closure until the projections on the closure disengage from the recesses in the slides thereby releasing the closure from the inner mold, wherein the movement of the slides to release the closure from the inner mold is not a result of direct interaction between the ring and the slides. 14. The method of claim 13 further comprising: forming a tamper evident band on the skirt of the closure. 15. The method of claim 14 wherein the ring is a tamper evident band forming ring having an intaglio pattern thereon which forms the tamper evident band on the closure. 16. The method of claim 14 further comprising: extending a plunger from the core and contacting the closure to assist in releasing the closure from the inner mold. 17. The method of claim 1 wherein the ring does not contact the slide during movement of the slide to release the closure from the inner mold. 18. The method of claim 1 wherein the moving of the slide inwardly toward the longitudinal axis of the core is solely due to the movement of the closure when engaged with the slide. 19. The method of claim 1 wherein movement of the slides is limited to linear movement. 20. A method of molding a closure having a skirt extending downwardly from a panel and a plurality of interrupted projections extending inwardly from the skirt, the method comprising: introducing closure material into a mold cavity formed by an outer mold and an inner mold, the inner mold having a core and a plurality of spaced slides each having at least one recess on an outer face thereof for forming the projections on the skirt, the slides being mounted on the core for movement relative to the core in a direction obliquely oriented with respect to a longitudinal axis of the core, a ring surrounding a portion of the core; providing an undercut surface in the recesses to form corresponding undercut surfaces on the projections; removing the outer mold from the closure seated on the inner mold; contacting the closure with the ring; moving the ring parallel to the longitudinal axis of the core and away from the core and thereby removing the closure from the core; and moving the slides inwardly toward the longitudinal axis of the core using the movement of the closure until the projections on the closure disengage from the recesses in the slides thereby releasing the closure from the inner mold; wherein the moving of the slides to release the closure from the inner mold is not accomplished by engagement of the ring with the slides.