EP1361983A1 - Tamper evident closure - Google Patents

Tamper evident closure

Info

Publication number
EP1361983A1
EP1361983A1 EP02712528A EP02712528A EP1361983A1 EP 1361983 A1 EP1361983 A1 EP 1361983A1 EP 02712528 A EP02712528 A EP 02712528A EP 02712528 A EP02712528 A EP 02712528A EP 1361983 A1 EP1361983 A1 EP 1361983A1
Authority
EP
European Patent Office
Prior art keywords
cap
closure according
thickness
rim
closure
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.)
Granted
Application number
EP02712528A
Other languages
German (de)
French (fr)
Other versions
EP1361983B1 (en
Inventor
Michal Mierzwinski
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.)
Nutricia NV
Original Assignee
Nutricia NV
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
Application filed by Nutricia NV filed Critical Nutricia NV
Priority to EP02712528A priority Critical patent/EP1361983B1/en
Publication of EP1361983A1 publication Critical patent/EP1361983A1/en
Application granted granted Critical
Publication of EP1361983B1 publication Critical patent/EP1361983B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • B65D51/00—Closures not otherwise provided for
    • B65D51/24—Closures not otherwise provided for combined or co-operating with auxiliary devices for non-closing purposes
    • B65D51/248—Closures not otherwise provided for combined or co-operating with auxiliary devices for non-closing purposes the closure being provided with transient audible or visual signaling means, e.g. for indicating dispensing, or other illuminating or acoustic devices, e.g. whistles

Definitions

  • the invention is related to a tamper evident closure for a container such as ajar, comprising a cap and means for connecting the cap to a neck or throat of said container, said cap comprising a rim and an end wall which can be brought into two end shapes, one of said end shapes being mechanically stable and the other end shape being mechanically instable, wherein the end wall can be held in its instable position under the influence of a pressure difference over the inside and the outside when being connected to the container, and can be released towards its stable position by removing said pressure difference when being released from the container, said transfer from the instable to the stable position being accompanied by an audible sound.
  • Such closures are for instance applied for containers with nutritional or pharmaceutical products.
  • a typical process of manufacturing babyfood in glass jars comprises Tilling the jars with the contents at increased temperature and placing a cap on the jar by means of a "steamcapper" as is known in the art. Subsequently the jars are placed in a retort for sterilisation, as to guarantee an excellent microbiological quality for the product.
  • the caps are expensive to produce and are difficult to modify (shape or printing) to give it a unique appearance.
  • the latter disadvantage is more serious when many different products are sold in the same type of package.
  • high demands are put on the quality and nature of the inner compound of the cap, in order to ensure easy twisting of the cap and to prevent contamination of the contents of the jar.
  • caps were developed which consisted of two parts: one plastic part which was used for closing the jar and which has a circular opening above the opening of the jar, and a second part that consists of a circular shaped tin plate which fits in this opening and which produces the audible signal when the cap is twisted off.
  • These caps are even more expensive to produce and have more limitations with regard to the possibilities to introduce modifications in the shape of the cap with regard to printing.
  • the object of the invention is to provide a closure which does not have these disadvantages, instead the closure should be relatively cheap and should be able to produce an audible sound upon opening.
  • the cap is essentially of a polymer material and comprises a central cap part, the stable shape of which is defined by an outer surface which is spherically convex.
  • a cap of a polymer material having a spherically convex stable shape is able to produce an audible signal, upon changing the instable shape into the stable shape.
  • the polymer material in question should be of a certain stiffness for producing such sound, and therefore preference is given to a propylene material.
  • good results are obtained in case at least a part of the cap is of a composite polymer material, e.g. containing fibres.
  • the polymer material can resist the conditions that result from the heating or cooling process. It forms consistently an air tight closure, experiences less problems with lubrication, contamination or discoloration (browning of compound), allows large flexibility with regard to shape or colour of the cap and possibility for printing.
  • the loudness of the audible signal can be further improved by selecting an appropriate design of the cap.
  • a ring shaped cap part is provided, the central cap part in its stable shape and said ring shaped cap part intersecting each other according to a non-zero intersecting angle in a radial cross-section of the closure.
  • the point of intersection between the central cap part and the ring shaped part, in a radial cross-section of the closure has a distance to the outside of the rim which is at least equal to the thickness of said rim.
  • the point of intersection has a distance to the outside of the rim which is at least equal to the sum of the thickness of said rim and the thickness of said coating. Good results can be obtained in case the point of intersection has a distance to the outside of the rim which is at least equal to the sum of the thickness of said rim and the thickness of the neck or throat of the jar.
  • the transfer between the instable and stable position of the cap can be promoted by introducing a switch area which has a smaller thickness than the remainder of the cap, said switch area enabling the transfer between the instable and stable positions of the cap.
  • This switch area may have a thickness which is 0,1 - 0,9 times the thickness of the remainder of the cap; preferably the switch area has a thickness which is 0,2 - 0,8 times the thickness of the remainder of the cap.
  • Said switch area may be situated at the position of the point of intersection. It can take the form of a continuous ring, but is may also be constituted by a series of spots.
  • the intersecting angle between the central cap part and the ring may be comprised in the range of 2° - 30°; preferably the intersecting angle ⁇ is comprised in the range of 4° - 15°.
  • FIG. 1 shows ajar comprising a closure according to the invention.
  • Fig. 2 shows an axial cross section through the jar and closure according to fig. 1.
  • Fig. 3 shows a view in perspective.
  • Fig. 4 shows a view in perspective of the inside of the cap of the closure according to the invention.
  • Fig. 5 shows an enlarged detail of the further embodiment of the closure, in axial cross section.
  • ajar 2 e.g. of glass
  • a cap 1 according to the invention.
  • This cap 1 has a rim 5 which comprises a screw thread 10 on the inside.
  • the neck 4 of the jar comprises a corresponding screw thread 11 on the outside.
  • a tight seal can be obtained between the upper surface 12 of the neck 4, and the lower surface 13 of the ring shaped cap part 8.
  • This lower side 13 is defined by a coating 9, which stretches over the rim 5 and the ring shaped cap part 8.
  • the central cap part 7 is spherically convex, and has a stable dome shaped indicated by with full lines in fig. 5, as well as an instable, almost flat shape indicated with dotted lines in said fig. 5. ,
  • the central cap part 6 joins the ring shaped cap part 8 through a line of intersection 14, which in the embodiment shown is a continuous line. Alternatively, the intersection will also be discontinuous.
  • a switch area is defined, which switch area may also have a reduced thickness with respect to the remainder of the cap (not shown).
  • the switch area may have the thickness of 0,1 - 0,9 times the thickness of the remainder of the cap, or preferably 0,2 - 0,8 times.
  • an angle ⁇ is defined, in the axial cross section shown in fig. 2, between the ring shaped cap part 8 and the central cap part 7, which angle can range from 2° to 30°.
  • the intersecting angle ⁇ is comprised in the range of 4° - 15°.
  • the distance w between the line of intersection 14 and the outer circumference of the ring is preferably at least equal to the sum of the thickness of said ring, the thickness of the coating 9, and the thickness of the neck 4.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Closures For Containers (AREA)
  • Glass Compositions (AREA)
  • Transition And Organic Metals Composition Catalysts For Addition Polymerization (AREA)
  • Preparation Of Compounds By Using Micro-Organisms (AREA)

Abstract

A tamper evident closure for a container (2) such as a jar, comprises a cap (1) and means (3) for connecting the cap (1) to a neck (4) or throat of said container (2), said cap (1) comprising a rim (5) and an end wall (6) which can be brought into two end shapes, one of said end shapes being mechanically stable and the other end shape being mechanically instable, wherein the end wall (6) can be held in its instable position under the influence of a pressure difference over the inside and the outside when being connected to the container (2), and can be released towards its stable position by removing said pressure difference when being released from the container (2), said transfer from the instable to the stable position being accompanied by an audible sound. The cap (1) is essentially of a polymer material and comprises a central cap part (7) which, in the stable shape of which is defined by an outer surface which is spherically convex. <IMAGE>

Description

Tamper evident closure
The invention is related to a tamper evident closure for a container such as ajar, comprising a cap and means for connecting the cap to a neck or throat of said container, said cap comprising a rim and an end wall which can be brought into two end shapes, one of said end shapes being mechanically stable and the other end shape being mechanically instable, wherein the end wall can be held in its instable position under the influence of a pressure difference over the inside and the outside when being connected to the container, and can be released towards its stable position by removing said pressure difference when being released from the container, said transfer from the instable to the stable position being accompanied by an audible sound.
Such closures are for instance applied for containers with nutritional or pharmaceutical products. A typical process of manufacturing babyfood in glass jars comprises Tilling the jars with the contents at increased temperature and placing a cap on the jar by means of a "steamcapper" as is known in the art. Subsequently the jars are placed in a retort for sterilisation, as to guarantee an excellent microbiological quality for the product.
During and directly after the heat treatment process large changes in physical conditions (pressure, temperature) occur, which puts high demands on the closure with regard to tightness. The closure forms a tight seal which resists the normal forces that could occur during transport and distribution and shelf life.
In addition, it is of utmost importance to the consumer that the package has not been opened before. This would guarantee the consumer that no micro-organisms, chemicals, toxins etc. have been introduced in the product. For this reason, closures have been developed which demonstrate a clear audible signal once the product is being opened. Reference is made to the well-known tin caps for closures of glass jars. On the inside, these caps are covered by a soft material (compound) that can withstand the conditions and allows a consistent closure of the jar. By pressing and twisting the cap can be removed. Once the vacuum, that was created during the cooling process, disappears the cap takes it original form and a "clicking sound" can be heard. Despite the good closure and tamper-evident properties the caps are expensive to produce and are difficult to modify (shape or printing) to give it a unique appearance. The latter disadvantage is more serious when many different products are sold in the same type of package. In addition high demands are put on the quality and nature of the inner compound of the cap, in order to ensure easy twisting of the cap and to prevent contamination of the contents of the jar.
Furthermore, homogeneous plastic caps have been developed which can resist retorting conditions. However, they appeared not to be able to produce an audible signal. Thus, additional tamper-evident members such as a paper or plastic sealing were required. These are however less practical to the consumer.
Also caps were developed which consisted of two parts: one plastic part which was used for closing the jar and which has a circular opening above the opening of the jar, and a second part that consists of a circular shaped tin plate which fits in this opening and which produces the audible signal when the cap is twisted off. These caps are even more expensive to produce and have more limitations with regard to the possibilities to introduce modifications in the shape of the cap with regard to printing. The object of the invention is to provide a closure which does not have these disadvantages, instead the closure should be relatively cheap and should be able to produce an audible sound upon opening. This object is achieved in that the cap is essentially of a polymer material and comprises a central cap part, the stable shape of which is defined by an outer surface which is spherically convex.
It appears that a cap of a polymer material having a spherically convex stable shape is able to produce an audible signal, upon changing the instable shape into the stable shape. The polymer material in question should be of a certain stiffness for producing such sound, and therefore preference is given to a propylene material. Furthermore, good results are obtained in case at least a part of the cap is of a composite polymer material, e.g. containing fibres. Also, the polymer material (compound) can resist the conditions that result from the heating or cooling process. It forms consistently an air tight closure, experiences less problems with lubrication, contamination or discoloration (browning of compound), allows large flexibility with regard to shape or colour of the cap and possibility for printing. The loudness of the audible signal can be further improved by selecting an appropriate design of the cap. Preferably, between the central cap part and the rim a ring shaped cap part is provided, the central cap part in its stable shape and said ring shaped cap part intersecting each other according to a non-zero intersecting angle in a radial cross-section of the closure.
In order to ascertain a proper, tight sealing of the closure, it is preferred that the point of intersection between the central cap part and the ring shaped part, in a radial cross-section of the closure, has a distance to the outside of the rim which is at least equal to the thickness of said rim. In case the inner surface of the rim is coated, the point of intersection has a distance to the outside of the rim which is at least equal to the sum of the thickness of said rim and the thickness of said coating. Good results can be obtained in case the point of intersection has a distance to the outside of the rim which is at least equal to the sum of the thickness of said rim and the thickness of the neck or throat of the jar.
The transfer between the instable and stable position of the cap can be promoted by introducing a switch area which has a smaller thickness than the remainder of the cap, said switch area enabling the transfer between the instable and stable positions of the cap. This switch area may have a thickness which is 0,1 - 0,9 times the thickness of the remainder of the cap; preferably the switch area has a thickness which is 0,2 - 0,8 times the thickness of the remainder of the cap.
Said switch area may be situated at the position of the point of intersection. It can take the form of a continuous ring, but is may also be constituted by a series of spots. The intersecting angle between the central cap part and the ring may be comprised in the range of 2° - 30°; preferably the intersecting angle α is comprised in the range of 4° - 15°.
The invention will now be described further with reference to an embodiment of the closure shown in the figures. Fig. 1 shows ajar comprising a closure according to the invention.
Fig. 2 shows an axial cross section through the jar and closure according to fig. 1. Fig. 3 shows a view in perspective.
Fig. 4 shows a view in perspective of the inside of the cap of the closure according to the invention. Fig. 5 shows an enlarged detail of the further embodiment of the closure, in axial cross section.
As shown in the figures 1 - 5, ajar 2, e.g. of glass, is provided with a cap 1 according to the invention. This cap 1 has a rim 5 which comprises a screw thread 10 on the inside. The neck 4 of the jar comprises a corresponding screw thread 11 on the outside. By screwing the cap 1 on the jar 2, a tight seal can be obtained between the upper surface 12 of the neck 4, and the lower surface 13 of the ring shaped cap part 8. This lower side 13 is defined by a coating 9, which stretches over the rim 5 and the ring shaped cap part 8.
The central cap part 7 is spherically convex, and has a stable dome shaped indicated by with full lines in fig. 5, as well as an instable, almost flat shape indicated with dotted lines in said fig. 5. ,
The central cap part 6 joins the ring shaped cap part 8 through a line of intersection 14, which in the embodiment shown is a continuous line. Alternatively, the intersection will also be discontinuous.
At the spot of the line of intersection 14, a switch area is defined, which switch area may also have a reduced thickness with respect to the remainder of the cap (not shown). For instance, the switch area may have the thickness of 0,1 - 0,9 times the thickness of the remainder of the cap, or preferably 0,2 - 0,8 times.
At said line of intersection 14, an angle α is defined, in the axial cross section shown in fig. 2, between the ring shaped cap part 8 and the central cap part 7, which angle can range from 2° to 30°. Preferably, the intersecting angle α is comprised in the range of 4° - 15°. The distance w between the line of intersection 14 and the outer circumference of the ring, is preferably at least equal to the sum of the thickness of said ring, the thickness of the coating 9, and the thickness of the neck 4.

Claims

Claims
1. Tamper evident closure for a container (2) such as ajar, comprising a cap (1) and means (3) for connecting the cap (1) to a neck (4) or throat of said container (2), said cap (1) comprising a rim (5) and an end wall (6) which can be brought into two end shapes, one of said end shapes being mechanically stable and the other end shape being mechanically instable, wherein the end wall (6) can be held in its instable position under the influence of a pressure difference over the inside and the outside when being connected to the container (2), and can be released towards its stable position by removing said pressure difference when being released from the container (2), said transfer from the instable to the stable position being accompanied by an audible sound, characterised in that the cap (1) is essentially of a polymer material and comprises a central cap part (7) the stable shape of which is defined by an outer surface which is spherically convex.
2. Closure according to claim 1, wherein between the central cap part (7) and the rim (5) a ring shaped cap part (8) is provided, the central cap part in its stable shape and said ring shaped cap part (8) intersecting each other according to a non-zero intersecting angle in a radial cross-section of the closure.
3. Closure according to claim 2, wherein the intersecting angle α is comprised in the range of2° - 30°.
4. Closure according to claim 3, wherein the intersecting angle α is comprised in the range of4° - 15°.
5. Closure according to claim 2, 3 or 4, wherein the point of intersection between the central cap part (7) and the ring shaped part (8), in a radial cross-section of the closure, has a distance to the outside of the rim (5) which is at least equal to the thickness of said rim (5).
6. Closure according to claim 5, wherein the inner surface of the rim (5) is coated, the point of intersection having a distance to the outside of the rim (5) which is at least equal to the sum of the thickness of said rim (5) and the thickness of said coating (9).
7. Closui'e according to claim 5 or 6, wherein the point of intersection has a distance to the outside of the rim (5) which is at least equal to the sum of the thickness of said rim (5) and the thickness of said neck (4) or throat.
8. Closure according to any of the preceding claims, wherein the cap (1) has at least one switch area which has a smaller thickness than the remainder of the cap, said at least one switch area enabling the transfer between the instable and stable positions of the cap (1).
9. Closure according to claim 8, wherein the switch area has a thickness which is 0,1 - 0,9 times the thickness of the remainder of the cap.
10. Closure according to claim 9, wherein the switch area has a thickness which is 0,2 - 0,8 times the thickness of the remainder of the cap.
11. Closure according to any of claims 2 - 10, wherein the switch area is at the position of the point of intersection.
12. Closure according to claim 8, 9, 10 or 11 wherein the switch area is a continuous ring.
13. Closure according to claim 8, 9, 10 or 11, wherein the switch area is constituted by a series of spots.
14. Closure according to any of the preceding claims, wherein the cap (1) is of a propylene polymer.
15. Closure according to claim 14, wherein the cap (1) is of a composite polymer material.
16. Closure according to claim 15, wherein at least one part of the cap (1) is of a composite polymer material containing fibres.
17. Closure according to any of the preceding claims 1 - 13, wherein the coating is of a polyethylene polymer.
18. Closure according to any of the preceding claims, wherein the cap is of a homogeneous character.
19. Closure according to any of the preceding claims, wherein the cap is of a mainly circular symmetric shape.
20. In combination, a closure according to any of the preceding claims, as well as a container.
21. Cap (1) for a closure according to any of the preceding claims.
EP02712528A 2001-02-22 2002-02-22 Tamper evident closure Expired - Lifetime EP1361983B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP02712528A EP1361983B1 (en) 2001-02-22 2002-02-22 Tamper evident closure

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
EP01200651A EP1236653A1 (en) 2001-02-22 2001-02-22 Tamper evident closure
EP01200651 2001-02-22
EP02712528A EP1361983B1 (en) 2001-02-22 2002-02-22 Tamper evident closure
PCT/NL2002/000114 WO2002066335A1 (en) 2001-02-22 2002-02-22 Tamper evident closure

Publications (2)

Publication Number Publication Date
EP1361983A1 true EP1361983A1 (en) 2003-11-19
EP1361983B1 EP1361983B1 (en) 2007-07-11

Family

ID=8179922

Family Applications (2)

Application Number Title Priority Date Filing Date
EP01200651A Withdrawn EP1236653A1 (en) 2001-02-22 2001-02-22 Tamper evident closure
EP02712528A Expired - Lifetime EP1361983B1 (en) 2001-02-22 2002-02-22 Tamper evident closure

Family Applications Before (1)

Application Number Title Priority Date Filing Date
EP01200651A Withdrawn EP1236653A1 (en) 2001-02-22 2001-02-22 Tamper evident closure

Country Status (4)

Country Link
EP (2) EP1236653A1 (en)
AT (1) ATE366700T1 (en)
DE (1) DE60221101D1 (en)
WO (1) WO2002066335A1 (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8403174B2 (en) 2006-08-28 2013-03-26 Kraft Foods Global Brands Llc Snap resealing closure for a container
CN103969427B (en) * 2009-11-23 2016-03-16 艾博生物医药(杭州)有限公司 A kind of device detecting analyte in sample
EP2766273A1 (en) 2011-10-12 2014-08-20 Sonoco Development, Inc. Sealing overcap for a container
WO2017162559A1 (en) 2016-03-25 2017-09-28 Unilever N.V. Container and lid with audible and tactile feedback

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3967746A (en) * 1975-04-28 1976-07-06 Botkin Albert L Canning closure and method
EP0179199A3 (en) * 1984-10-22 1988-01-20 Anchor Hocking Corporation Vacuum indicating button on plastic closure caps
US5119962A (en) * 1990-10-12 1992-06-09 Continental White Cap, Inc. Closure button/panel energy enhancement
US5458252A (en) * 1994-06-03 1995-10-17 American Precision Plastics Corporation Invertible, pressure-responsive sealing cap

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO02066335A1 *

Also Published As

Publication number Publication date
WO2002066335A1 (en) 2002-08-29
DE60221101D1 (en) 2007-08-23
ATE366700T1 (en) 2007-08-15
EP1361983B1 (en) 2007-07-11
EP1236653A1 (en) 2002-09-04

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