Packaging container with preformed sealing ring

Patent metadata

Field	Value
Publication number	US-11325767-B2
Application number	US-202016929989-A
Country	US
Kind code	B2
Filing date	Jul 15, 2020
Priority date	Jan 23, 2018
Publication date	May 10, 2022
Grant date	May 10, 2022

Abstract

A packaging container for holding contents such as fresh food. The container comprises a tray having a flange, a pre-formed scaling 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.

First claim

The invention claimed is:

1. A packaging container comprising:
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 from the rim and having an upper surface, the upper surface having a shape;
a layer of adhesive disposed on the upper surface of the flange; and
a sealing ring disposed solely onto the upper surface of the flange and adhered to the flange; wherein
prior to being disposed onto the upper surface of the flange, the sealing ring is preformed from a filament made of heat sealable material by feeding the filament from a spool, grasping the filament with an orbiter that orbits about an application tool until the filament overlaps itself, cutting the filament to create two ends, and welding the two ends together.

2. The container of claim 1 wherein:
the sealing ring is adhered to the upper surface of the flange by heat welding.

3. The container of claim 1 wherein:
the layer of adhesive is either pressure sensitive adhesive (PSA) or heat activated adhesive (HAA); and
the sealing ring is adhered to the pressure sensitive adhesive or heat activated adhesive.

4. The container of claim 1 wherein:
the filament comprises material selected from the group consisting of polyethylene (PE), polypropylene (PP), polyester, polyamide, ionomer and polyacrylic.

5. The container of claim 1 wherein:
the filament comprises a blend of an adhesive and a substrate in which the adhesive has an affinity for the flange.

6. The container of claim 1 wherein:
the container further comprises a flexible film adhered to the sealing ring to cover and enclose the cavity; and
the filament comprises a blend of an adhesive and a substrate in which the adhesive has an affinity for the flexible film.

7. The container of claim 1 further comprising:
a coating disposed onto at least a portion of the tray, the coating adapted to enhance a shelf life of the contents.

8. The container of claim 1 further comprising:
a near field communication (NFC) chip embedded into the flange.

9. The container of claim 1 further comprising:
a near field communication (NFC) chip disposed into a recess defined by the flange and held in place at least partially by the sealing ring.

10. The container of claim 1 further comprising:
a near field communication (NFC) chip embedded into the sealing ring.

11. The container of claim 1 further comprising:
a flexible film hermetically secured to the sealing ring and enclosing the cavity, wherein at least a portion of the flexible film is adapted to be peeled away from the sealing ring to provide access to the contents.

12. A packaging container comprising:
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 from the rim and having an upper surface, the upper surface having a shape;
a layer of adhesive disposed on the upper surface of the flange;
a sealing ring disposed solely onto the upper surface, the sealing ring made from heat sealable material; and
a flexible film adhered to the sealing ring to cover the contents and enclose the cavity, the flexible film adapted to be peeled away from the sealing ring to provide access to the contents.

13. The packaging container of claim 12 wherein:
the heat sealable material is selected from the group consisting of filament, fiber or tape.

14. The packaging container of claim 12 wherein:
the adhesive is either a pressure sensitive adhesive (PSA) or heat activated adhesive (HAA).

15. The packaging container of claim 12 wherein:
the heat sealable material comprises an adhesive having an affinity for the flange.

16. The packaging container of claim 12 wherein:
the heat sealable material comprises an adhesive having an affinity for the flexible film.

17. The packaging container of claim 12 wherein:
the sealing ring is coated with an adhesive having an affinity for the flange.

18. The packaging container of claim 12 wherein:
the sealing ring is coated with an adhesive having an affinity for the flexible film.

19. The packaging container of claim 12 wherein:
the sealing ring is substantially flat in order to lay flat against the upper surface.

Assignees

• Sonoco Dev Inc

Inventors

• Schwarz Richard A

Classifications

• B29C66/1122

  Single lap to lap joints, i.e. overlap joints (B29C66/45, B29C66/472, B29C66/52272 take precedence) · CPC title

• B65B7/164

  Securing by heat-sealing · CPC title

• B65B61/20

  for adding cards, coupons or other inserts to package contents (adding unpacking elements B65B61/18) · CPC title

• B29C65/5057

  positioned between the surfaces to be joined (B29C65/5035 takes precedence) · CPC title

• B29C65/5035

  being in thread form, i.e. in the form of a single filament, e.g. in the form of a single coated filament · CPC title