B - Operations – Transporting – 29 – C
Patent
B - Operations, Transporting
29
C
B29C 49/50 (2006.01) B29C 49/04 (2006.01)
Patent
CA 2647943
An extrusion blow mold for forming a plastic bottle having a radial flange suitable for roll-form attachment to a metal can end. The mold has a pair of confronting mold halves, each mold half including a body forming portion, a bottom pinch-off portion located below the body forming portion, a top block portion including a blow chamber located above the body forming portion, and a spin-ring forming portion located between the body forming portion and the top block portion. The spin-ring forming portion includes a thread ring insert and a cutter ring insert. The thread ring insert has an inside upper edge including an outwardly extending surface terminating in a step defining a lower surface and a outer edge of a radial flange. The cutter ring insert is positioned immediately above the thread ring insert. The cutter ring insert has a lower surface adjacent an inside edge defining an upper surface of the radial flange including a tapered inner edge extending upward and inward from the step. At least one of the thread ring insert and cutter ring insert includes a relief surface connected to a vent channel to permit gas to escape from the area defining the radial flange.
Kaanta Jason M.
Richardson Michael D.
Thierjung George A.
Amcor Rigid Plastics Usa Inc.
Ball Corporation
Bereskin & Parr Llp/s.e.n.c.r.l.,s.r.l.
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