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Heat Accumulators

Heat-resistant-plastics-container-closure

Bread making apparatus

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An exemplary embodiment of a high frequency heating cooking apparatus of the invention is ...

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Process for preparation of metal vessels

It is therefore a primary object of the present invention to provide a process in which in ...

Heat resistant plastics container closure

Details

Inventors: McCrossen, Peter C.;
Assignee: Radley Valley Pty Ltd. (Mordialloc, AU)
Primary Examiner: Shoap; Allan N.
Assistant Examiner: Stucker; Nova
Attorney, Agent or Firm: Vigil; Thomas R., Hanrath; James P.

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 sterilizing at temperatures up to 130.degree. 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 vapor. 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, t2FIGS. 4, 5) at least twice the thickness of that of the body sheet.

DETAILED DESCRIPTION The invention consists of plastics packaging container for hermetically sealed unrefrigerated storage of perishable food adapted to retain the hermetic seal during retort sterilization and adapted for manual opening and reclosing microwave oven heating of the food in the container, said container comprising: (a) a body formed from thermoplastics barrier sheet and having an open top and a radially outwardly flanged lip circumferentially defining said open top; (b) a substantially planar or axially stepped cover formed from thermoplastics barrier sheet of thickness 1 to 1.
5 mm and having a peripherally and radially outwardly extending flange portion adapted to mate in face-to-face relationship with the said outwardly flanged lip of the body; and (c) an injection molded thermoplastics reclosable reinforcing clamp ring comprising a plug half portion and a mating socket half portion wherein one said half portion is adapted to house and retain the flange portion of the body and the other half portion is adapted to house and retain at least the flange portion of the cover and whereby the said half portions are provided with mating engagement means adapted to tighten said flange portions of the body and cover into hermetic sealing contact upon axial rotation of one half portion of the clamp ring with respect to the other and wherein each of the half portions is formed from a thermoplastics material with minimum structural cross-sectional thickness at least twice the thickness of the body barrier sheet and the tightened clamp ring is adapted to retain the hermetic sealing contact between the said flange portions during a heating and cooling cycle in a steam pressurized retort reaching temperatures of 130.
degree.
C.
Preferably the socket half portion is in contact with and retains the cover and the socket half portion extends radially inwardly not more than the inward edge of the flange portion of the cover.
Preferably the cover portion has an inwardly directed step immediately radially inwardly of the flange portion that stiffens the cover and assists it locate in the body opening

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