Plastic container having geometry minimizing spherulitic crystallization below the finish and method
AssigneeSchmalbach-Lubeca AG
InventorsTimothy J. Boyd, Kerry W. Silvers
Life of this patent
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Abstract
A plastic container for retaining a commodity during a high temperature pasteurization or retort process. The container includes a finish defining an aperture for receiving the commodity, a body portion generally extending downward from the finish portion, and a base portion generally extending inward from the body portion and closing off the bottom of the container. The body portion itself includes a sidewall having a crystallinity of greater than 30% and a shoulder portion flaring outward, from a generally transverse plane defined by the mouth of the container, at an angle of about 15° or less.
Claims17
A plastic container for retaining a commodity during a high temperature pasteurization or retort process, said container comprising a finish defining an aperture for receiving the commodity, a body portion generally extending downward from said finish, and a base portion generally extending inward from said body portion and closing off a bottom portion of said container, said body portion having crystallinity of greater than 30%, and a shoulder portion flaring outward at an angle of about 15° or less relative to a generally transverse plane defined by said aperture, so as to provide a transition from an unoriented to an oriented material adjacent to said finish.
A plastic container for retaining a commodity, said container comprising a finish defining an aperture for receiving the commodity and having an opaque spherulitic crystalline portion, a body portion generally extending downward from said finish, and a base portion generally extending inward from said body portion and closing off a bottom portion of said container, said body portion having a shoulder portion flaring outward at an angle of about 15° or less relative to a generally transverse plane defined by said aperture, so as to provide a transition from an unoriented to an oriented material, and a portion below said shoulder portion having a molecular orientation sufficient to preclude formation of an opaque spherulitic crystalline structure.
Dependencies are inferred from the claim text.