EP1590256A1 - Plastic closing cap with sealing ring - Google Patents

Plastic closing cap with sealing ring

Info

Publication number
EP1590256A1
EP1590256A1 EP03729513A EP03729513A EP1590256A1 EP 1590256 A1 EP1590256 A1 EP 1590256A1 EP 03729513 A EP03729513 A EP 03729513A EP 03729513 A EP03729513 A EP 03729513A EP 1590256 A1 EP1590256 A1 EP 1590256A1
Authority
EP
European Patent Office
Prior art keywords
closing cap
container neck
cap according
sealing ring
container
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP03729513A
Other languages
German (de)
French (fr)
Inventor
Dimitrios Pairis
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
PAIRI DORIS
PAIRI STAMATINA
PAIRIS EMMANUEL
Original Assignee
PAIRI DORIS
PAIRI STAMATINA
PAIRIS EMMANUEL
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from GR20020100016A external-priority patent/GR1004224B/en
Priority claimed from GR20020100015A external-priority patent/GR1004079B/en
Application filed by PAIRI DORIS, PAIRI STAMATINA, PAIRIS EMMANUEL filed Critical PAIRI DORIS
Publication of EP1590256A1 publication Critical patent/EP1590256A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • 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
    • B65D41/00—Caps, e.g. crown caps or crown seals, i.e. members having parts arranged for engagement with the external periphery of a neck or wall defining a pouring opening or discharge aperture; Protective cap-like covers for closure members, e.g. decorative covers of metal foil or paper
    • B65D41/02—Caps or cap-like covers without lines of weakness, tearing strips, tags, or like opening or removal devices
    • B65D41/04—Threaded or like caps or cap-like covers secured by rotation
    • B65D41/0407—Threaded or like caps or cap-like covers secured by rotation with integral sealing means
    • B65D41/0414—Threaded or like caps or cap-like covers secured by rotation with integral sealing means formed by a plug, collar, flange, rib or the like contacting the internal surface of a container neck
    • B65D41/0421—Threaded or like caps or cap-like covers secured by rotation with integral sealing means formed by a plug, collar, flange, rib or the like contacting the internal surface of a container neck and combined with integral sealing means contacting other surfaces of a container neck
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • 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
    • B65D41/00—Caps, e.g. crown caps or crown seals, i.e. members having parts arranged for engagement with the external periphery of a neck or wall defining a pouring opening or discharge aperture; Protective cap-like covers for closure members, e.g. decorative covers of metal foil or paper
    • B65D41/02—Caps or cap-like covers without lines of weakness, tearing strips, tags, or like opening or removal devices
    • B65D41/04—Threaded or like caps or cap-like covers secured by rotation
    • B65D41/0435—Threaded or like caps or cap-like covers secured by rotation with separate sealing elements
    • B65D41/045—Discs

Definitions

  • the present invention relates to a plastic closing cap for a container with an annular sealing ring.
  • Container closures moulded in one piece from a plastic material including downwardly depending seals are well known in the art. The purpose of these arrangements is to enable a cap to be easily screwed onto a container neck such that the edge of the container neck seals against the underside of the top plate of the cap, while the sealing ring is pressed into firm sealing engagement with the edge of the container neck.
  • caps when applied to plastic containers for sterilized beverage e.g. milk or diary products, must also meet rigid requirements to prevent contamination and the overall cap structure must be leak-proof. In order to provide a liquid-tight seal it is, therefore, known to use either a sealing laminated mebrane on the opening of the container or a separate liner inside of the cap.
  • an object of the present invention to provide an improved plastic closing cap, which overcomes the deficiencies of the prior art and ensures reliably the sealing function and prevents leaks in the event of minor damage or deformation of the container neck.
  • a further aspect of the present invention is to provide a closing cap particular useful for sterilized products such as milk or diary products which provides easy opening and reclosing of the container and effectively sealing prior to and after reclosing.
  • a closing cap moulded in one piece from a plastics material for sealing a container with a threaded neck comprising a top plate which is substantially in the form of a circular disc, a substantially cylindrical peripheral portion extending downwardly from said top plate, said peripheral portion having an internal screw thread adapted to cooperate with the threaded container neck, an integrally moulded deformable sealing ring extending downwardly from an inner surface of said top plate and spaced radially inward of the substantially cylindrical peripheral portion, wherein when said closing cap is applied onto the threaded container neck, said sealing ring is adapted to radially deform outwardly and seal at least substantially along the outer surface of the container neck by virtue of the elastic return forces without being clamped between the container neck and the substantially cylindrical peripheral portion and without being pressed against the substantially cylindrical peripheral portion.
  • the closing cap of the invention is ergonomic by offering compactness, and it adapts very easily to any container necks . In the closed position it ensures perfect sealing.
  • the cap is also able to retain a liquid-tight seal after a period of time due to its configuration in conjuction with its material's characteristics.
  • Figs. 1A and IB show a perspective view, partially broken away, of a closing cap according to the present invention applied to the container prior to, and after formation of a seal;
  • Figs. 2A and 2B show a perspective view, partially broken away, of a second alternative closing cap according to the present invention applied to the container prior to, and after formation of a seal;
  • Figs. 3A and 3B show a perspective view, partially broken away, of a third alternative closing cap according to the present invention applied to the container prior to, and after formation of a seal;
  • Figs. 4A and 4B show a perspective view, partially broken away, of another alternative closing cap according to the present invention applied to the container prior to, and after formation of a seal;
  • Figs. 5A and 5B show a partial cross-sectional view of an alternative closing cap according to the present invention in place on a container prior to, and after removal of the laminated disc;
  • Fig. 6A and 6B show a partial cross-sectional view of a further alternative closing cap according to the present invention in place on a container prior to, and after removal of the laminated disc.
  • the closing cap 1 is moulded in one piece from a resilient plastics material and has a top plate 3 in the shape of a circular disc and an annular skirt 4 peripherally downwardly depending therefrom.
  • the annular skirt 4 has an internal screw thread 5.
  • the sealing ring 6 is disposed at a position spaced radially inwardly of the annular skirt 4, and concentric with said annular skirt.
  • Said sealing ring 6 has a length such as to permit its portion adjoining its free edge to extend along the upper outer surface of the container neck 2.
  • the sealing ring 6 is made of the same plastic material as the cap 1 and preferably has a thickness of equal or less than 0.8mm.
  • a container has an annular neck 2 with an external thread formed thereon.
  • the closing cap is adapted for use with a container, which is a thin-walled light weight blow-molded plastic bottle (e.g. for milk or diary products) provided with an externally screw-threaded neck 2.
  • the container neck 2 has above its threads an upwardly and inwardly directed portion 8 which is tapered (e.g. frusto-conically) and may have a substantially radially inwardly directed rim 9 for engagement with a stop means 7 of the closing cap referred to below.
  • the closing cap 1 is applied to the container neck 2 so that the top of the container neck moves upwardly as in Figure 1A to adopt the position shown in Figure IB.
  • the sealing ring 6 first comes into contact with the outer surface of the container neck 2 while the closing cap 1 is being rotated during the capping operation. Further rotation of the closing cap 1 relative to the container neck 2 causes the container neck 2 to move upwardly relative to the closing cap 2 to adopt the position shown in Figure IB .
  • the sealing ring 6 On the inner surface of the top plate, the sealing ring 6 is disposed at a radius approximately equal to the radial distance of the middle of the tapered portion 8 of the container neck 2. Therefore, during the capping operation the sealing ring 6 is being urged away by the tapered portion 8 of the container neck 2 and thus it is deformed radially outwardly, and lies against the outer surface of the tapered portion 8 of the container neck, and has a sufficient length in contact with it.
  • the sealing ring 6 is fully conformed to the outer surface of the container neck 2 by virtue of its elasticity without being clamped between the container neck 2 and the annular skirt 4 and without being pressed against the skirt In this condition an effective tight seal is formed between the outer surface of the tapered portion 8 of the container neck 2 and the inner surface of the sealing ring 6. Moreover, due to the elastic return forces which occur in that case and the deformation of the sealing ring 6 in conjuction with the resilience of the plastics material, said seal is maintained despite relaxation.
  • sealing ring is L-shaped and sealing integrity is afforted by virtue of engagement of the short side of the L-shaped sealing ring, which is parallel to the top plate of the cap, with the upper portion (tapered portion) of the container neck, wherein said short side is displaced inwardly and is then clamped between the outside surface of the container neck and the long side of the L-shaped sealing ring.
  • Figs. 3A and 3B show another modification of the invention in which the sealing ring is attached to the annular skirt above its internal threads and is substantially parallel to the top plate of the cap.
  • Firures 4A and 4B show a further modification of the present invention in which the sealing ring is attached to the inner surface of the top plate of the cap at a position spaced radially inwardly of the annular skirt and extends downwardly and inwardly (conical) from the top plate of the cap.
  • FIGS. 5A and 5B show an alternative modification for use in cases where there is a laminated disc 10 sealed on the container opening.
  • the laminated disc is attached to and sealed on the containers by means of a plastic heat shrinkable tube which insures a tight sealing engagement about the container opening.
  • This arrangement offers many advantages, e.g. high shapping nature and high-temp resistance, tight sealing and better fineness.
  • the stop means 7 is a shallow ring which extends downwardly from the inner surface of the top plate 3. It is disposed radially inwardly of the sealing ring 6, and has an external diameter which is slightly smaller than the inner diameter of the inwardly directed rim 9 of the container neck 2, namely slightly smaller than the container opening.
  • the stop means is further provided with a tapering conical tip.
  • the laminated disc 10 at the region of the rim portion 9 of the container neck 2 comes into contact with the tapering tip of the stop means 7 which has the effect of limiting the upwardly movement of the container neck 2.
  • the closing cap 1 is screwed onto the container neck 2, the sealing ring 6 is not deformed and a liduid-tight seal is provided by the laminated disc 10.
  • the reclosing of the container is achieved in that the closing cap 1 is further rotated, and due to the relative movement between the container neck 2 and the cap 1, the stop means 7 adopts the position shown in Figure 5B . Only just during this reclosing procedure the sealing ring 6 comes into contact with the tapered portion 8 of the container neck 2 and is thereby deformed.
  • the stop means 7 is intended essentially and primarily as a restriction and secondly as a seal, the main sealing effect also in this modification is to be found between the outer surface of the tapered portion 8 of the container neck 2 and the inner surface of the sealing ring 6.
  • the stop means 7 is disposed in-board of the sealing ring 6, it tends to strengthen the central portion of the top plate 3. This resists doming. It will thus be seen that during reclosing of the cap 1 to the container neck 2, the outer surface of the tapered portion 8 of the container neck 2 first comes into contact with the sealing ring 6 thereby causing effective sealing. It will also be appreciated that by virtue of the relative thickness of the flexible sealing ring 6 taken with the effects of the stop means 7, a more effective seal is provided than previously.
  • stop means 7 acts as a stiffening rib and may be continuous or discontinuous.
  • FIG. 6A and 6B The arrangement shown in Figures 6A and 6B is similar to that in Figures 5A and 5B, but in Figs. 6A and 6B the stop means 7 is an annular disc depending from the inner surface of the top plate 3 of the cap and is generally trapezoidal in cross section, decreasing in a direction downwardly and away from the the top plate.
  • the inventive closing caps are preferably made by injection moulding of polypropylene or high density polyethylene plastics materials.
  • the stop means is intended to have sealing properties but needs to be used in conjuction with a primary seal for example as hereinbefore set forth.
  • the closing cap is designed to be fitted onto a glass or plastic container, such as a soft drink bottle.
  • the container can hold various liquids including, but not limited to, diary products, a carbonated beverage, a non-carbonated liquid or a vaporized product .
  • Closures of this type may be produced, preferably by injection moulding, with or without tamper evident band.
  • the skirt terminates in a plurality of frangible bridges supporting a tamper evident band for cooperation with a plain security band on the outer neck portion of the container neck in the usual way.
  • the skirt is preferably provided with external knurling or vertical ribbing to improve manual grip.
  • the thickness of the sealing ring may be preferably more than 0.80mm.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Closures For Containers (AREA)

Abstract

A closing cap moulded in one piece from a plastics material for sealing a container with a threaded neck has a top plate (3), an annular skirt (4) with an internal screw thread (5) adapted to cooperate with the threaded container neck (2), and an integrally moulded deformable annular sealing ring (6) extending downwardly from an inner surface of said top plate (3) and spaced radially inwardly of the annular skirt (4), wherein when the closing cap (1) is screwed onto the container neck (2), the sealing ring (6) is deformed outwardly and is fully conformed to the outer surface of the container neck (2) without being clamped between the container neck (2) and the annular skirt (4) and without being pressed against the annular skirt (4).

Description

PLASTIC CLOSING CAP WITH SEALING RING
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a plastic closing cap for a container with an annular sealing ring.
BACKGROUND OF THE INVENTION
Container closures moulded in one piece from a plastic material including downwardly depending seals are well known in the art. The purpose of these arrangements is to enable a cap to be easily screwed onto a container neck such that the edge of the container neck seals against the underside of the top plate of the cap, while the sealing ring is pressed into firm sealing engagement with the edge of the container neck.
In the case of containers made of plastics material it can certainly happen that the edge of the container neck has suffered minor damage, deformation and/or irregularities caused during the manufacturing procedure, and which are sufficient to have a negative effect on the sealing engagement between the edge of the container neck and sealing elements of the cap. Thus, a deteriorated seal in the case of bottles for carbonated drinks can have the result that gas escapes from the bottle and after a few days of storage the drink has lost its carbon dioxide and is tasteless. The known closures therefore still do not guarantee absolutely sealig integrity in the event of minor damage or deformation of the edge of the container neck.
In addition, caps when applied to plastic containers for sterilized beverage e.g. milk or diary products, must also meet rigid requirements to prevent contamination and the overall cap structure must be leak-proof. In order to provide a liquid-tight seal it is, therefore, known to use either a sealing laminated mebrane on the opening of the container or a separate liner inside of the cap.
However, these arrangements are characterized by higher manufacturing and/or recycling costs while cannot guarantee reliable sealing integrity. SU MARY OF THE INVENTION
It is, therefore, an object of the present invention to provide an improved plastic closing cap, which overcomes the deficiencies of the prior art and ensures reliably the sealing function and prevents leaks in the event of minor damage or deformation of the container neck.
A further aspect of the present invention is to provide a closing cap particular useful for sterilized products such as milk or diary products which provides easy opening and reclosing of the container and effectively sealing prior to and after reclosing.
In accordance with the above objects of the present invention, a closing cap moulded in one piece from a plastics material for sealing a container with a threaded neck is provided comprising a top plate which is substantially in the form of a circular disc, a substantially cylindrical peripheral portion extending downwardly from said top plate, said peripheral portion having an internal screw thread adapted to cooperate with the threaded container neck, an integrally moulded deformable sealing ring extending downwardly from an inner surface of said top plate and spaced radially inward of the substantially cylindrical peripheral portion, wherein when said closing cap is applied onto the threaded container neck, said sealing ring is adapted to radially deform outwardly and seal at least substantially along the outer surface of the container neck by virtue of the elastic return forces without being clamped between the container neck and the substantially cylindrical peripheral portion and without being pressed against the substantially cylindrical peripheral portion.
Further preferred embodiments of the present invention are defined in dependent claims 2 to 17.
The closing cap of the invention is ergonomic by offering compactness, and it adapts very easily to any container necks . In the closed position it ensures perfect sealing.
The cap is also able to retain a liquid-tight seal after a period of time due to its configuration in conjuction with its material's characteristics.
Operations of assembling the cap together on the neck of the container is quick and very easy. Other objects and advantages of the present invention will become apparent to those skilled in the art in view of the following detailed description taken in conjuction with the accompanying drawings, wherein like reference numbers refer to similar parts throughout the drawings, and wherein: BRIEF DESCRIPTION OF THE DRAWINGS
Figs. 1A and IB show a perspective view, partially broken away, of a closing cap according to the present invention applied to the container prior to, and after formation of a seal;
Figs. 2A and 2B show a perspective view, partially broken away, of a second alternative closing cap according to the present invention applied to the container prior to, and after formation of a seal;
Figs. 3A and 3B show a perspective view, partially broken away, of a third alternative closing cap according to the present invention applied to the container prior to, and after formation of a seal;
Figs. 4A and 4B show a perspective view, partially broken away, of another alternative closing cap according to the present invention applied to the container prior to, and after formation of a seal;
Figs. 5A and 5B show a partial cross-sectional view of an alternative closing cap according to the present invention in place on a container prior to, and after removal of the laminated disc; and
Fig. 6A and 6B show a partial cross-sectional view of a further alternative closing cap according to the present invention in place on a container prior to, and after removal of the laminated disc.
DETAILED DESRIPTION OF THE INVENTION
Referring first to Figure 5A of the drawings, the closing cap 1 is moulded in one piece from a resilient plastics material and has a top plate 3 in the shape of a circular disc and an annular skirt 4 peripherally downwardly depending therefrom. The annular skirt 4 has an internal screw thread 5. On the inner surface of the top plate 3 extending downwardly there is an integrally moulded thin, deformable annular sealing ring 6 of uniform thickness which is of substantially cylindrical construction. In addition, the sealing ring 6 is disposed at a position spaced radially inwardly of the annular skirt 4, and concentric with said annular skirt. Said sealing ring 6 has a length such as to permit its portion adjoining its free edge to extend along the upper outer surface of the container neck 2. The sealing ring 6 is made of the same plastic material as the cap 1 and preferably has a thickness of equal or less than 0.8mm.
A container has an annular neck 2 with an external thread formed thereon.
In accordance with one aspect of the present invention the closing cap is adapted for use with a container, which is a thin-walled light weight blow-molded plastic bottle (e.g. for milk or diary products) provided with an externally screw-threaded neck 2. The container neck 2 has above its threads an upwardly and inwardly directed portion 8 which is tapered (e.g. frusto-conically) and may have a substantially radially inwardly directed rim 9 for engagement with a stop means 7 of the closing cap referred to below.
In use, as depicted in Figs .1A and IB, the closing cap 1 is applied to the container neck 2 so that the top of the container neck moves upwardly as in Figure 1A to adopt the position shown in Figure IB. As it does so the sealing ring 6 first comes into contact with the outer surface of the container neck 2 while the closing cap 1 is being rotated during the capping operation. Further rotation of the closing cap 1 relative to the container neck 2 causes the container neck 2 to move upwardly relative to the closing cap 2 to adopt the position shown in Figure IB .
On the inner surface of the top plate, the sealing ring 6 is disposed at a radius approximately equal to the radial distance of the middle of the tapered portion 8 of the container neck 2. Therefore, during the capping operation the sealing ring 6 is being urged away by the tapered portion 8 of the container neck 2 and thus it is deformed radially outwardly, and lies against the outer surface of the tapered portion 8 of the container neck, and has a sufficient length in contact with it.
Hence, the sealing ring 6 is fully conformed to the outer surface of the container neck 2 by virtue of its elasticity without being clamped between the container neck 2 and the annular skirt 4 and without being pressed against the skirt In this condition an effective tight seal is formed between the outer surface of the tapered portion 8 of the container neck 2 and the inner surface of the sealing ring 6. Moreover, due to the elastic return forces which occur in that case and the deformation of the sealing ring 6 in conjuction with the resilience of the plastics material, said seal is maintained despite relaxation.
At the same time, because of this radial displacement of the sealing ring 6, there is a pivotal force applied to the inner surface of the top plate 3 which tends to resist doming in conjuction with the stop means 7 of the cap referred to below.
Referring now to Figures 2A and 2B of the drawings, another modification of the present invention is shown in which the sealing ring is L-shaped and sealing integrity is afforted by virtue of engagement of the short side of the L-shaped sealing ring, which is parallel to the top plate of the cap, with the upper portion (tapered portion) of the container neck, wherein said short side is displaced inwardly and is then clamped between the outside surface of the container neck and the long side of the L-shaped sealing ring.
Figs. 3A and 3B show another modification of the invention in which the sealing ring is attached to the annular skirt above its internal threads and is substantially parallel to the top plate of the cap.
Firures 4A and 4B show a further modification of the present invention in which the sealing ring is attached to the inner surface of the top plate of the cap at a position spaced radially inwardly of the annular skirt and extends downwardly and inwardly (conical) from the top plate of the cap.
Arrangements of the foregoing type are used with a further main feature of the invention shown in Figures 1 to 6, i.e. the stop means 7. Figs. 5A and 5B show an alternative modification for use in cases where there is a laminated disc 10 sealed on the container opening.
The laminated disc is attached to and sealed on the containers by means of a plastic heat shrinkable tube which insures a tight sealing engagement about the container opening. This arrangement offers many advantages, e.g. high shapping nature and high-temp resistance, tight sealing and better fineness.
The stop means 7 is a shallow ring which extends downwardly from the inner surface of the top plate 3. It is disposed radially inwardly of the sealing ring 6, and has an external diameter which is slightly smaller than the inner diameter of the inwardly directed rim 9 of the container neck 2, namely slightly smaller than the container opening. The stop means is further provided with a tapering conical tip.
As shown in Fig.5A, during the capping procedure, the laminated disc 10 at the region of the rim portion 9 of the container neck 2 comes into contact with the tapering tip of the stop means 7 which has the effect of limiting the upwardly movement of the container neck 2. In this condition the closing cap 1 is screwed onto the container neck 2, the sealing ring 6 is not deformed and a liduid-tight seal is provided by the laminated disc 10. Once the container has been opened and the laminated disc 10 has been removed, the reclosing of the container is achieved in that the closing cap 1 is further rotated, and due to the relative movement between the container neck 2 and the cap 1, the stop means 7 adopts the position shown in Figure 5B . Only just during this reclosing procedure the sealing ring 6 comes into contact with the tapered portion 8 of the container neck 2 and is thereby deformed.
Because the stop means 7 is intended essentially and primarily as a restriction and secondly as a seal, the main sealing effect also in this modification is to be found between the outer surface of the tapered portion 8 of the container neck 2 and the inner surface of the sealing ring 6.
Further, because the stop means 7 is disposed in-board of the sealing ring 6, it tends to strengthen the central portion of the top plate 3. This resists doming. It will thus be seen that during reclosing of the cap 1 to the container neck 2, the outer surface of the tapered portion 8 of the container neck 2 first comes into contact with the sealing ring 6 thereby causing effective sealing. It will also be appreciated that by virtue of the relative thickness of the flexible sealing ring 6 taken with the effects of the stop means 7, a more effective seal is provided than previously.
The stop means 7 and the stiffness of the top plate 3 together result in that the effects of doming upon the sealing ring 6 are reduced thus ensuring that the sealing ring 6 does not get pulled out of sealing engagement with the container neck 2.
Further, the stop means 7 acts as a stiffening rib and may be continuous or discontinuous.
The arrangement shown in Figures 6A and 6B is similar to that in Figures 5A and 5B, but in Figs. 6A and 6B the stop means 7 is an annular disc depending from the inner surface of the top plate 3 of the cap and is generally trapezoidal in cross section, decreasing in a direction downwardly and away from the the top plate.
The inventive closing caps are preferably made by injection moulding of polypropylene or high density polyethylene plastics materials. The stop means is intended to have sealing properties but needs to be used in conjuction with a primary seal for example as hereinbefore set forth.
The closing cap is designed to be fitted onto a glass or plastic container, such as a soft drink bottle.
It should be noted that the container can hold various liquids including, but not limited to, diary products, a carbonated beverage, a non-carbonated liquid or a vaporized product .
Closures of this type may be produced, preferably by injection moulding, with or without tamper evident band. Preferably the skirt terminates in a plurality of frangible bridges supporting a tamper evident band for cooperation with a plain security band on the outer neck portion of the container neck in the usual way.
The skirt is preferably provided with external knurling or vertical ribbing to improve manual grip. The thickness of the sealing ring may be preferably more than 0.80mm.
While preferred embodiments have been shown and described obviously minor modifications in design and construction can be effected in the invention without departing from the spirit and scope thereof, as defined in the appended claims.

Claims

CLAIMS 1. A closing cap moulded in one piece from a plastics material for sealing a container with a threaded neck comprising: a top plate (3) which is substantially in the form of a circular disc; a substantially cylindrical peripheral portion (4) extending downwardly from said top plate (3), said peripheral portion having an internal screw thread (5) adapted to cooperate with the threaded container neck (2); an integrally moulded deformable annular sealing ring (6) extending downwardly from an inner surface of said top plate (3) and spaced radially inward of the substantially cylindrical peripheral portion (4) , wherein when said closing cap (1) is applied onto the threaded container neck (2) , said sealing ring (6) is adapted to radially deform outwardly and seal at least substantially along the outer surface of the container neck (2) by virtue of the elastic return forces without being clamped between the container neck (2) and the substantially cylindrical peripheral portion (4) and without being pressed against said substantially cylindrical peripheral portion (4) .
2. The closing cap according to claim 1, wherein said sealing means (6) is substantially cylindrical.
3. The closing cap according to claim 1, wherein said sealing means (6) is L-shaped.
4. The closing cap according to any preceding claim, wherein said sealing means (6) has a uniform thickness of equal or less than 0.80mm.
5. The closing cap according to any preceding claim, wherein said outer surface of the container neck (2) has, above its threads, an upwardly and inwardly directed tapered portion (8) and a substantially radially inwardly directed rim (9) and said sealing ring (6) is disposed at a radius approximately equal to the radial distance of the middle of the tapered portion (8) of the container neck (2) .
6. The closing cap according to claim 6, wherein said sealing ring (6) is deformed radially outwardly by the tapered portion (8) of the container neck (2) and is fully conformed to the outer surface of the container neck (2) by virtue of its elasticity without being pressed against the substantially cylindrical peripheral portion(4).
7. The closing cap according to any preceding claim further comprising a continuous or discontinuous stop means (7) extending downwardly from the inner surface of said top plate (3) and disposed radially inwardly of said deformable sealing ring (6) .
8. The closing cap according to claim 8, wherein said stop means (7) has an external diameter which is slightly smaller than an inner diameter of the substantially radially inwardly directed rim (9) of the container neck (2) .
9. The closing cap according to any preceding claim, wherein said stop means (7) is adapted to limit the upwardly movement of the container neck (2) .
10. The closing cap according to any preceding claim, wherein said stop means (7) is adapted to be inserted in the opening of the container neck (2) after removal of the sealing laminated disc (10) .
11. The closing cap according to any preceding claim, wherein said sealing ring (6) only just during the reclosing procedure and after removal of the laminated disc (10) first comes into contact with the tapered portion (8) of the container neck (2) and is thereby deformed.
12. The closing cap according to any preceding claim, wherein said stop means (7) is a shallow ring with a tapering conical tip.
13. The closing cap according to any preceding claim, wherein said stop means (7) is an annular disc.
14. The closing cap according to any preceding claim, wherein said substantially cylindrical peripheral portion
(4) has at its distal end a tamper evident band for cooperation with a security band on the outer neck portion of the container neck (2) .
15. The closing cap according to any preceding claim, wherein said substantially cylindrical peripheral portion
(4) is provided with external knurling.
16. The closing cap according to any preceding claim, wherein said closing cap (1) is made by injection moulding,
17. An assembly of a container having a threaded neck and a closing cap (1) according to any one of the preceding claims .
EP03729513A 2002-01-16 2003-01-15 Plastic closing cap with sealing ring Withdrawn EP1590256A1 (en)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
GR2002100016 2002-01-16
GR20020100016A GR1004224B (en) 2002-01-16 2002-01-16 Additional circumferential packing ring for closures
GR20020100015A GR1004079B (en) 2002-01-16 2002-01-16 Circumferential malformed compression ring for sealing plastic closures
GR2002100015 2002-01-16
PCT/GR2003/000001 WO2003059768A1 (en) 2002-01-16 2003-01-15 Plastic closing cap with sealing ring

Publications (1)

Publication Number Publication Date
EP1590256A1 true EP1590256A1 (en) 2005-11-02

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EP03729513A Withdrawn EP1590256A1 (en) 2002-01-16 2003-01-15 Plastic closing cap with sealing ring

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EP (1) EP1590256A1 (en)
AU (1) AU2003201043A1 (en)
WO (1) WO2003059768A1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2862290B1 (en) * 2003-11-17 2006-09-08 Tetra Laval Holdings & Finance DEVICE FOR CLOSING A CONTAINER COLLAR AND CONTAINER HAVING SUCH A DEVICE

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US4531649A (en) * 1984-04-23 1985-07-30 Anchor Hocking Corporation Molded plastic cap with sealing liner
US4637519A (en) * 1985-09-03 1987-01-20 Sun Coast Plastics, Inc. Two part closure
US5158195A (en) * 1985-12-12 1992-10-27 Tri-Tech Systems International, Inc. Closure cap with a seal and method of and apparatus for forming such closure and seal
US5449078A (en) * 1994-07-08 1995-09-12 Thermar Corporation Combination of a container and a safety cap therefor
US5489036A (en) * 1994-11-30 1996-02-06 Kraft Foods, Inc. Screw threaded container with a triple seal
US6126027A (en) * 1995-02-21 2000-10-03 Mcg Closures Limited Self-centering container closure
GB2311283A (en) * 1996-03-19 1997-09-24 Lawson Mardon Cap for a container
EP1092639A1 (en) * 1999-10-14 2001-04-18 Crown Cork & Seal Technologies Corporation Plastic closure cap

Non-Patent Citations (1)

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Title
See references of WO03059768A1 *

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WO2003059768A1 (en) 2003-07-24
AU2003201043A1 (en) 2003-07-30

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