Plastic packaging with at least one welded knob

• US 20040154948A1
• Filed: 04/08/2004
• Published: 08/12/2004
• Est. Priority Date: 04/25/2001
• Status: Active Grant

• Current Assignee: Convenience Food Systems Wallau GmbH & Company KG
• Original Assignee: Convenience Food Systems Wallau GmbH & Company KG
• Inventors: Fux, Rudolf
• Granted Patent: US 7,322,473 B2
• Time in Patent Office: Days
• US Class Current: 206/461
• CPC Class Codes: B65D 77/2032 by peeling or tearing the cover from the container
• CPC Class Codes: B65D 77/2076 provided by the cover itself
• CPC Class Codes: Y10S 206/807 Tamper proof

Abstract

The invention relates to a plastic packaging (1) made from a packaging dish (2) and a cover lid (3). The cover lid (3) is at least partially sealed to the packaging dish (2) in a peelable manner and the cover lid (3), or the packaging dish (2), comprises at least one knob (5) and complementary to the above the packaging dish (2) or the cover lid (3) comprises a recess (6), through which the knob(s) is/are pressed on sealing the plastic packaging (1). At least a partial region of at least one knob is provided with a sealing material (9) or preferably at least one partial region of at least one knob (5) and the boundary region of the complementary recess (7) is connected to a sealing material (9), which on first opening of the packaging (1) is damaged. The invention further relates to methods for the production of said packages (1).

Claims

1. Plastic packaging (1) consisting of a packaging cavity (2) and a cover film (3), wherein the cover film (3) is sealed in the sealing region (4) to the packaging cavity so as to be at least partly peelable, the cover film (3) or the packaging cavity (2) having at least one knob (5), and the packaging cavity (2) or the cover film (3) having at least one recess (6) complementary to the knob, through which the knob(s) is or are pushed upon sealing the plastic packaging,

characterised in that

at least one partial region of at last one knob (5) is provided with a sealing material (9), or preferably at least one partial region of at least one knob (5) and the edge region of the complementary recess (7) are connected with sealing material (9), which is damaged upon first opening of the packaging.

2. Plastic packaging (1) according to claim 1, characterised in that the damage is a break, an at least partial falling-away and/or a deformation of the sealing material (9).

3. Plastic packaging (1) according to claim 1 or 2, characterised in that the damage can be detected without technical assistance.

4. Plastic packaging (1) according to claim 1 to 3, characterised in that the sealing material (9) has a colour that is different, preferably clearly different, from the colour of the plastic packaging (1).

5. Plastic packaging (1) according to claim 1 to 4, characterised in that the sealing material (9) itself has a colour and the surface of the sealing material (9) has a different colour, wherein first opening of the plastic packaging (1) damages the surface colour of the sealing material (9) in such a way that the colour of the underlying sealing material (9) becomes visible.

6. Plastic packaging (1) according to claim 1 to 5, characterised in that the sealing material (9) has sufficient adhesive strength to guarantee securing to a knob (5), preferably to a knob (5) and the edge region of a complementary recess (7), and the storage and customary transport of the plastic packaging, wherein first opening of the plastic packaging (1) causes the sealing material (9) at least partially to fall away and/or deform, preferably break and, particularly preferably causes the sealing material (9) to fall away completely from the plastic packaging (1).

7. Plastic packaging (1) according to claim 1 to 6, characterised in that the sealing material (9) is a natural or synthetic wax or a plastic, preferably a plastic which hardens under the effect of air and/or heat and/or radiation such that the sealing material (9) becomes so brittle that it is easily damaged when the packaging (1) is opened.

8. Plastic packaging (1) according to claim 1 to 7, characterised in that the sealing material (9) is self-adhesive, preferably self-adhesive in a heated state.

9. Plastic packaging (1) according to claim 1 to 8, characterised in that the sealing material (9) is applied to at least one knob (5), preferably to at least one knob (5) and the edge region of the complementary recess (7), using an adhesive material.

10. Plastic packaging (1) according to claim 1 to 9, characterised in that the sealing material (9) is brittle and breaks upon first opening of the plastic packaging (1).

11. Plastic packaging (1) according to claim 1 to 10, characterised in that the packaging (1) is resealable, preferably resealable through the introduction of at least one knob (5) in a recess (6).

12. Plastic packaging (1) according to one of claims 1 to 11, characterised in that the cover film (3) is made of a thermoformable film made of polyethylene terephthalate or polypropylene, where appropriate with an ethylene vinyl alcohol copolymer barrier layer and polyethylene, and the packaging cavity (2) is made of a foamed polyolefin film, preferably a foamed polypropylene film, as the basis layer with, where appropriate, a gas barrier layer and a peelable sealing layer.

13. Plastic packaging (1) according to one of claims 1 to 12, characterised in that the sealing region (4) is completely peelable.

14. Plastic packaging (1) according to one of claims 1 to 12, characterised in that one side or 5-25% of the sealing region is firmly sealed.

15. Plastic packaging (1) according to claim 14, characterised in that the knob(s) (5) and complementary recess(es) (6) are disposed outside the firm sealing region.

16. Method for the manufacture of a plastic packaging (1) according to one of claims 1 to 15, characterised in that the packaging cavity is produced by thermoforming from a film, either at least one recess is made, preferably punched, in the packaging cavity, the packaging cavity (2) is optionally filled, a cover film (3) is sealed to the packaging cavity and the complementary knob is produced by thermoforming the cover film, or

2a. at least one knob is formed in the edge region of the packaging cavity produced in step 1. and

4a. at last one complementary packaging is made in the cover film before or after sealing with the packaging cavity,

characterised in that

at least one partial region of at least one knob (5) is provided with a sealing material (9), or preferably at least one partial region of at least one knob (5) and the edge region of the complementary recess (7) are connected with a sealing material (9), which is damaged upon first opening of the packaging.