# US 8,431,201 B2 · Plastic cap and container

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- Number: US 8,431,201 B2
- Document ID: US8431201B2
- Status: Granted
- Kind: B2
- Application number: 10/504,984
- Filed: 2003-02-13
- Published: 2005-08-11
- Granted: 2013-04-30
- Earliest claimed: 2002-02-13
- Assignees: Modulpac AB
- Applicants: Bengt Malmborg
- Inventors: Bengt Malmborg
- Web page: https://patentgrep.com/patent/US8431201B2

## CPC

- B65D 41/18: non-metallic, e.g. made of paper or plastics {(B65D41/17 takes precedence)}
- B29C 45/14811: {Multilayered articles (B29C45/14827 takes precedence)}
- B29K 2705/00: Use of metals, their alloys or their compounds, for preformed parts, e.g. for inserts
- B29K 2995/0067: non-permeable
- B29L 2031/565: {for containers}
- Y10T 428/13: Hollow or container type article [e.g., tube, vase, etc.]
- Y10T 428/1352: Polymer or resin containing [i.e., natural or synthetic]
- Y10T 428/1379: Contains vapor or gas barrier, polymer derived from vinyl chloride or vinylidene chloride, or polymer containing a vinyl alcohol unit
- Y10T 428/239: Complete cover or casing
- Y10T 428/23929: Edge feature or configured or discontinuous surface
- Y10T 428/23986: With coating, impregnation, or bond
- Y10T 428/2424: Annular cover
- Y10T 428/24264: Particular fold structure [e.g., beveled, etc.]
- B65D: CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B29C: SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING (making preforms B29B11/00; making laminated products by combining previously unconnected layers which become one product whose layers will remain together B32B37/00 - B32B41/00)
- B29K: INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR {MOULDS, } REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29L: INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

The invention concerns a plastic cap (1) and a container (4) using same. The plastic cap (1) comprises an oxygen-tight liner (8) to be joined to an opening end surface (6) of a spout (5) on the container (4). The cap (1) has a circumferential skirt (2) with an internal annular bead (3) adapted for snap connection with a corresponding annular groove (7) in the spout (5). The liner (8) has on the side facing the cap (1) a first plastic layer (81), which is arranged to be permanently joined, when injection-molding the cap (1), to the plastic material of the cap (1), and on the side facing the container (4) a second plastic layer (82), which is arranged to be temporarily hermetically sealed to said opening end surface (6). On the end facing the container (4), the skirt (2) has a radial projection (10) which serves as a thumb grip and which when opening the container (4) allows the cap (1) to be bent away from said opening end surface (6) so that the temporary, hermetic seal between the second plastic layer (82) of the liner (8) and the opening end surface (6) of the spout (5) is gradually broken. The liner (8) comprises an intermediate layer (83) which is made of metal material enabling induction welding of the cap (1) to the opening end surface (6) of the container (4).

## Claims

### Claim 1

A plastic cap for a container (4), which cap (1), for oxygen-tight sealing of the container (4), comprises:
an integral oxygen-tight liner (8) to be joined to an opening end surface (6) of a spout (5) on the container (4) and, for attachment to the spout (5), has a circumferential skirt (2), which is arranged to surround the spout (5) and which has an internal annular bead (3) adapted for snap connection with a corresponding annular groove (7) in the spout (5),
wherein the integral oxygen-tight liner (8) having an oxygen-tight intermediate layer (83), whose side facing the cap (1) is coated with a first plastic layer (81) arranged to be permanently joined to the cap (1) and whose side facing the container (4) is coated with a second plastic layer (82) arranged to be temporarily hermetically sealed to said opening end surface (6), and the integral oxygen-tight liner (8) and the cap (1) being joined to each other such that the integral oxygen-tight liner (8) when removing the cap (1) from the spout (5) accompanies the cap (1),
wherein said first plastic layer (81) is arranged to be permanently joined, when injection-moulding the cap (1), to the plastic material of the cap (1), and that the skirt (2) at the end facing the container (4) has a radial projection (10), which serves as a thumb grip and which when opening the container (4) allows the cap (1) and the integral oxygen-tight liner (8) to be bent away from said opening end surface (6) so that the temporary, hermetic seal between the second plastic layer (82) of the integral oxygen-tight liner (8) and the opening end surface (6) of the spout (5) is gradually broken,
wherein the intermediate layer (83) of the integral oxygen-tight liner (8) is made of metal material enabling induction-welding of the cap (1) to the opening end surface (6) of the container (4).

### Claim 2 (depends on 1)

A plastic cap as claimed in claim 1, in which said radial projection is a flange (10) extending along the entire circumference of the cap (1).

### Claim 3 (depends on 1)

A plastic cap as claimed in claim 1, in which the skirt (2) at the end facing the container (4) has a tamper-evident ring (9), which is arranged to cooperate with a corresponding retaining means on the spout (5) and to be broken off from the cap (1) when removing the cap (1) from the spout (5).

### Claim 4 (depends on 2)

A plastic cap as claimed in claim 2, in which the skirt (2) at the end facing the container (4) has a tamper-evident ring (9), which is arranged to cooperate with a corresponding retaining means on the spout (5) and to be broken off from the cap (1) when removing the cap (1) from the spout (5).

### Claim 5

A plastic cap for a container (4), which cap (1), for oxygen-tight sealing of the container (4), comprises an integral oxygen-tight liner (8) to be joined to an opening end surface (6) of a spout (5) on the container (4) and, for attachment to the spout (5), has a circumferential skirt (2), which is arranged to surround the spout (5) and which has an internal annular bead (3) adapted for snap connection with a corresponding annular groove (7) in the spout (5),
said integral oxygen-tight liner (8) comprising an oxygen-tight intermediate layer (83) having a side facing the cap (1) which is coated with a first plastic layer (81) and a side facing the container (4) which is coated with a second plastic layer (82),
said intermediate layer (83) being made of metal material,
said first plastic layer (81), when injection moulding the cap (1), being permanently joined to the cap (1), and
said second plastic layer (82), being arranged to be temporarily hermetically sealed to said opening end surface (6) by induction-welding enabled by said intermediate layer (83),
said skirt (2) at the end facing the container (4) having a radial projection (10), which serves as a thumb grip and which when opening the container (4) allows the cap (1) and the integral oxygen-tight liner (8) therein to be bent away from said opening end surface (6),
so that the temporary, hermetic seal between the second plastic layer (82) of the integral oxygen-tight liner (8) and the opening end surface (6) of the spout (5) is gradually broken.