Heat resistant plastics container closure

B - Operations – Transporting – 65 – D

Patent

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Details

B65D 45/30 (2006.01) B65D 81/34 (2006.01)

Patent

CA 2114012

2114012 9301988 PCTABS00019 A plastics container (10) for hermetically sealed unrefrigerated storage of perishable food that is capable of retaining the hermetic seal during steam retort cooking and sterilising at temperatures up to 130 ·C. The container has a body (12) and cover (16) of a lightweight, disposable nature made from thermoformable plastics barrier sheet capable of prolonged resistance to transmission of oxygen, other gases and water vapour. The container and lid have flange portions (14, 18) that are retained in contact by an injection moulded thermoplastics reinforcing clamp ring in two pieces, a plug half (24) and a socket half (26) that twist-to-lock together in screw thread manner. The clamp ring parts are preferably of polypropylene and moulded with structural cross-sectional thicknesses (t1, t2, Figures 4, 5) at least twice the thickness of that of the body sheet.

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