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US 10,766,682 B2Granted
Packaging container with preformed sealing ring
AssigneeSonoco Development, Inc.
InventorRichard A Schwarz
Life of this patent
Estimating the term…
Abstract
A packaging container for holding contents such as fresh food. The container comprises a tray having a flange, a pre-formed sealing ring and a flexible film for sealing in the contents of the tray. The sealing ring is made from fiber, filament or tape (“FFT”) that is shaped into a shape that matches the shape of the tray flange. The sealing ring is adhered to the tray flange by heat welding or other means and the flexible film is adhered to the sealing ring.
Claims5
A method of manufacturing a filled container, the method comprising the steps of:
- (a) forming a rigid tray comprising a base and a flange, the base having a rim and defining a cavity configured to receive contents therein, the flange extending radially outward from the rim, the flange having an upper surface, the upper surface having a shape;
- (b) providing a filament made of a heat sealable material;
- (c) preforming a sealing ring by feeding the filament from a spool, grasping the filament with an orbiter that orbits about an applicator tool until the filament overlaps itself, cutting the filament to create two ends, and welding the two ends together;
- (d) positioning the sealing ring onto the upper surface of the flange;
- (e) adhering the sealing ring to the flange;
- (f) filling at least part of the cavity with the contents;
- (g) applying a flexible film onto the sealing ring to cover and enclose the cavity;
- and
- (h) adhering the flexible film to the sealing ring by heat welding.
6 more elements
Dependencies are inferred from the claim text.