B - Operations – Transporting – 65 – D
Patent
B - Operations, Transporting
65
D
B65D 50/02 (2006.01) B29C 45/04 (2006.01) B29C 45/26 (2006.01) B29C 45/44 (2006.01) B65D 41/32 (2006.01) B65D 41/34 (2006.01) B65D 55/02 (2006.01)
Patent
CA 2357098
A method for manufacturing a tamper-indicating closure having a plurality of resilient flexible projections bent upwardly and radially inwardly at a predetermined radius of curvature. The first step in the method includes providing a mold assembly comprising a female mold portion for forming the outer surface of the closure and a male mold portion for forming the closure's inner surface and its plurality of projections. The male and female mold portions are arranged for relative movement toward and away from each other between a mold open position and a mold closed position. When in the mold closed position, the male and female mold portions define a mold cavity in which the tamper-indicating closure is molded. The next steps in the method are to move the male and female mold portions into the mold closed position; to provide a mold material into the mold cavity; and, to maintained the mold portions in the mold closed position for a predetermined time period until the tamper-indicating closure is formed with its projections disposed at their predetermined radius of curvature. Next, the male mold portion is removed from the molded closure, whereby the projections temporarily bend from their predetermined radius of curvature to a second position. The closure includes a plurality of strain relief recesses corresponding to the number of projections, each strain relief recess being located radially outwardly from each projection. Each recess, in combination with the predetermined radius of curvature, acting to limit the extent of deformation of the corresponding projection during removal of the male mold portion so the projection can elastically return to substantially its "as molded" configuration.
Armstrong William D.
Mcnary Drew H.
Captive Plastics Inc.
Ridout & Maybee Llp
LandOfFree
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