Collapse resistant polyester container for hot fill applications
AssigneeMonsanto Company
InventorsPurushottam D. Agrawal, John F. Mandell
Life of this patent
Estimating the term…
Abstract
A collapse resistant polyester container is provided for hot fill applications employing product fill temperatures up to about 190.degree. F. (87.8.degree. C.) or more. The container has at least one region which is thermoelastically deformable inwardly after the container is hot filled and sealed to offset the pressure forces which tend to collapse the container as the contents cool and create an internal vacuum. The thermoelastic region is preferably formed in a two step molding process in which the region is formed and heat set at a first position and then reformed outwardly to a second position and cooled in that position.
Claims16
A collapse-resistant, molecularly oriented, heat set polyester container having at least one preselected inwardly thermoelastically deformable region for at least partially relieving negative pressure tending to collapse the container when hot filled, sealed and the contents allowed to cool.
A collapse-resistant, oriented heat set polyester container for use in hot fill applications comprising sidewalls and a base, said base being inwardly thermoelastically deformable to at least partially relieve pressure forces which tend to collapse the container when the container is hot filled, sealed and the contents allowed to cool.
Dependencies are inferred from the claim text.