EP0366198B1 - Tamper-evident closure - Google Patents
Tamper-evident closure Download PDFInfo
- Publication number
- EP0366198B1 EP0366198B1 EP89202672A EP89202672A EP0366198B1 EP 0366198 B1 EP0366198 B1 EP 0366198B1 EP 89202672 A EP89202672 A EP 89202672A EP 89202672 A EP89202672 A EP 89202672A EP 0366198 B1 EP0366198 B1 EP 0366198B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- sealing ring
- screw cap
- connections
- container
- breaking
- 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.)
- Expired - Lifetime
Links
Images
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
- B65D41/32—Caps or cap-like covers with lines of weakness, tearing-strips, tags, or like opening or removal devices, e.g. to facilitate formation of pouring openings
- B65D41/34—Threaded or like caps or cap-like covers provided with tamper elements formed in, or attached to, the closure skirt
- B65D41/3461—Threaded or like caps or cap-like covers provided with tamper elements formed in, or attached to, the closure skirt the tamper element being retracted by heat or by heat and pressure
- B65D41/3466—Threaded or like caps or cap-like covers provided with tamper elements formed in, or attached to, the closure skirt the tamper element being retracted by heat or by heat and pressure and being integrally connected to the closure by means of bridges
Definitions
- the invention relates to a closure, as defined in the first part of claim 1.
- Such a closure is known in many embodiments (see fx. AU-A-0 531 254). It is usual for the connections to consist of thin material bridges. These have the drawback that they shrink more rapidly than the sealing ring in the processing phase in which the sealing ring undergoes shortening through the application of heat. As a consequence the axial shortening of the material bridges can then become so great that the sealing ring is fused to the bottom edge of the screw cap. This makes it difficult for the consumer to break the sealing, while it can even occur that the sealing is not broken at all, thus enabling unauthorized opening.
- the invention has for its object to embody a closure such that this drawback of the known art no longer occurs.
- the invention further proposes to make it possible using existing heat treatment devices for performing of the shrinking process (for instance those which are used in the case of for example 28 mm MCA-closures of polyethylene) to embody a break-in proof closure in for instance polypropylene on wide-mouthed containers, that is, containers with an opening diameter from circa 43 mm of for instance glass or PET.
- existing heat treatment devices for performing of the shrinking process for instance those which are used in the case of for example 28 mm MCA-closures of polyethylene
- a break-in proof closure in for instance polypropylene on wide-mouthed containers that is, containers with an opening diameter from circa 43 mm of for instance glass or PET.
- each connection comprises: a protective edge extending over at least a portion of the connections. a bridge portion moulded onto the sealing ring on the top side and having radial and axial dimensions in the same order of magnitude as those of the sealing ring; and a breaking portion extending between that bridge portion and the inside lower edge zone of the screw cap and having a smaller cross-sectional surface area than the bridge portion, which breaking portions are covered off by the protective edge, whereby, prior to the shrinking process and after the screwing of the screw cap into position on the container the sealing ring is situated on an axial position relative to the locking collar such that during shrinking of the sealing ring under the influence of localised temporary heat supply the shrinking forces thereby occurring cause a tensile stress in the connections such that the breaking portions undergo a stretching with associated cross-sectional surface area reduction.
- Achieved as a result of the dimensioning and placing of the breaking portions is that only a part of the locally and temporarily applied heat reaches the thin breaking portions, which results in the sealing ring and the bridge portions being shrunk before the breaking portions melt, which would result in at least partial breakage of the sealing ring during the shrinkage process.
- a second advantage is that after opening of the container with breakage of the connections the sharp points left over from the breaking portions lie hidden behind the protective edge so that there need be no fear of risk of injury to the consumer.
- the breaking pieces and the sealing ring are placed inwardly relative to the lower edge zone of the screw cap. The breaking piece protrudes slightly outward.
- the sealing ring lies comparatively close to the container, so that the heating time remains limited; because of this dimensioning the sealing ring has in any case to shrink less in order to come beneath the edge of the locking collar of the container. Because of this limited shrink time the thermal loading on the sealing ring is limited. A higher thermal loading could make the sealing ring brittle, with the result that it could break sooner than the breaking pieces. Such a manner of breaking gives a less clearly visible breakage of the sealing. This limited thermal loading also makes it possible to employ plastic containers, for instance of PET. Such containers could deform badly in the case of a too high thermal loading.
- the portion with the largest diameter of the locking collar lies approximately at the same position as the top side of the bridge portions without being in engagement therewith.
- the distribution of the connections over the periphery is partly determined by the diameter of the closure.
- the force required to break the sealing is relatively great and there is the danger that an inadequate breakage will result.
- the stability of the sealing ring is small during the heating which could cause a sagging of the ring when heating takes place and an insufficient sealing.
- connections are placed relative to a multi-start screw thread of the screw cap such that the lowest end of the screw thread is situated between the connections. It is the case with a multi-start screw thread that the screw cap wall is constrained outward at the end of a thread, which would result in the sealing ring also being pulled outward if a connection were present at this position. This could cause a less good shrinkage under the locking collar.
- Fig. 1 shows a container 1 such as a jam jar.
- This container comprises an opening 2, a substantially cylindrical wall part 3 adjoining this opening and having a number of screw threads 4 and present thereunder an annular locking collar 5.
- the container 1 can be closed by means of a cover or screw cap 6 which consists of a plastic and is manufactured as one whole by injection moulding.
- the cover 5 comprises internal screw thread 7 for co-action with the external screw threads 4 of container 1, a sealing ring 8 which serves for co-action with the locking collar 5, as will be further described later, a number of connections 9 placed distributed along the periphery between the sealing ring 8 and an inside lower edge zone 10 (see fig. 2-5) of the screw cap; an external protective edge 11 extending over a part of the connections 9 to be described later.
- connections being that part of the closure to which the invention relates, each comprise: a bridge portion 12 moulded onto the top side of the sealing ring 8 and having radial and axial dimensions in the same order of magnitude as those of the sealing ring 8; and a breaking portion 13 extending between that bridge portion 12 and the inside lower edge zone 10 of cover 8, which part 13 has a smaller cross-sectional surface area than bridge portion 12.
- the breaking portions 13 are covered off by the protective edge 11.
- Fig. 5 shows in more detail a number of features of this embodiment, to which the invention is not limited. Also indicated in this figure by way of example are several dimensions in mm. As can be seen from the figure, each breaking portion 13 also extends as a rib over at least a considerable part of the outer surface of the associated bridge portion 12.
Abstract
Description
- The invention relates to a closure, as defined in the first part of
claim 1. - Such a closure is known in many embodiments (see fx. AU-A-0 531 254). It is usual for the connections to consist of thin material bridges. These have the drawback that they shrink more rapidly than the sealing ring in the processing phase in which the sealing ring undergoes shortening through the application of heat. As a consequence the axial shortening of the material bridges can then become so great that the sealing ring is fused to the bottom edge of the screw cap. This makes it difficult for the consumer to break the sealing, while it can even occur that the sealing is not broken at all, thus enabling unauthorized opening.
- The invention has for its object to embody a closure such that this drawback of the known art no longer occurs.
- The invention further proposes to make it possible using existing heat treatment devices for performing of the shrinking process (for instance those which are used in the case of for example 28 mm MCA-closures of polyethylene) to embody a break-in proof closure in for instance polypropylene on wide-mouthed containers, that is, containers with an opening diameter from circa 43 mm of for instance glass or PET.
- These and other objects are achieved according to the invention with a closure of the stated type which displays the feature that each connection comprises:
a protective edge extending over at least a portion of the connections. a bridge portion moulded onto the sealing ring on the top side and having radial and axial dimensions in the same order of magnitude as those of the sealing ring; and
a breaking portion extending between that bridge portion and the inside lower edge zone of the screw cap and having a smaller cross-sectional surface area than the bridge portion, which breaking portions are covered off by the protective edge,
whereby, prior to the shrinking process and after the screwing of the screw cap into position on the container the sealing ring is situated on an axial position relative to the locking collar such that during shrinking of the sealing ring under the influence of localised temporary heat supply the shrinking forces thereby occurring cause a tensile stress in the connections such that the breaking portions undergo a stretching with associated cross-sectional surface area reduction. - Achieved with this configuration is that per corner part the heat capacity of the sealing ring and that of the bridge portions lies in the same order of magnitude. During the heat treatment the sealing ring shrinks tangentially and therefore radially, and the bridge portions shrink axially. Because the shrinkage of both is in the same order of magnitude it is not possible for the sealing ring to be shrunk fixedly against the lower edge zone of the screw cap.
- Achieved as a result of the dimensioning and placing of the breaking portions is that only a part of the locally and temporarily applied heat reaches the thin breaking portions, which results in the sealing ring and the bridge portions being shrunk before the breaking portions melt, which would result in at least partial breakage of the sealing ring during the shrinkage process. A second advantage is that after opening of the container with breakage of the connections the sharp points left over from the breaking portions lie hidden behind the protective edge so that there need be no fear of risk of injury to the consumer. The breaking pieces and the sealing ring are placed inwardly relative to the lower edge zone of the screw cap. The breaking piece protrudes slightly outward. As a result the sealing ring lies comparatively close to the container, so that the heating time remains limited; because of this dimensioning the sealing ring has in any case to shrink less in order to come beneath the edge of the locking collar of the container. Because of this limited shrink time the thermal loading on the sealing ring is limited. A higher thermal loading could make the sealing ring brittle, with the result that it could break sooner than the breaking pieces. Such a manner of breaking gives a less clearly visible breakage of the sealing. This limited thermal loading also makes it possible to employ plastic containers, for instance of PET. Such containers could deform badly in the case of a too high thermal loading.
- The portion with the largest diameter of the locking collar lies approximately at the same position as the top side of the bridge portions without being in engagement therewith. As a result of this placing a screw cap can easily be placed on prior to the shrinking process and the sealing ring has space to shrink beneath the locking collar of the container.
- The distribution of the connections over the periphery is partly determined by the diameter of the closure. When there is a comparatively large number of connections the force required to break the sealing is relatively great and there is the danger that an inadequate breakage will result. When there is a comparatively small number of connections the stability of the sealing ring is small during the heating which could cause a sagging of the ring when heating takes place and an insufficient sealing.
- In preference the connections are placed relative to a multi-start screw thread of the screw cap such that the lowest end of the screw thread is situated between the connections. It is the case with a multi-start screw thread that the screw cap wall is constrained outward at the end of a thread, which would result in the sealing ring also being pulled outward if a connection were present at this position. This could cause a less good shrinkage under the locking collar.
- Further features of the invention will now be stated and elucidated with reference to the annexed drawing, in which:
- fig. 1 shows a container with a cover wherein the invention is incorporated;
- fig. 2, 3 and 4 show three successive manufacturing phases of the closure according to fig. 1; and
- fig. 5 shows on larger scale the detail V from fig. 1.
- Fig. 1 shows a
container 1 such as a jam jar. This container comprises anopening 2, a substantiallycylindrical wall part 3 adjoining this opening and having a number ofscrew threads 4 and present thereunder anannular locking collar 5. - The
container 1 can be closed by means of a cover orscrew cap 6 which consists of a plastic and is manufactured as one whole by injection moulding. Thecover 5 comprisesinternal screw thread 7 for co-action with theexternal screw threads 4 ofcontainer 1, asealing ring 8 which serves for co-action with thelocking collar 5, as will be further described later, a number ofconnections 9 placed distributed along the periphery between thesealing ring 8 and an inside lower edge zone 10 (see fig. 2-5) of the screw cap; an externalprotective edge 11 extending over a part of theconnections 9 to be described later. The connections, being that part of the closure to which the invention relates, each comprise: abridge portion 12 moulded onto the top side of thesealing ring 8 and having radial and axial dimensions in the same order of magnitude as those of thesealing ring 8; and a breakingportion 13 extending between thatbridge portion 12 and the insidelower edge zone 10 ofcover 8, whichpart 13 has a smaller cross-sectional surface area thanbridge portion 12. The breakingportions 13 are covered off by theprotective edge 11. - In the situation shown in fig. 1 the
cover 5 still has to be screwed into place on the (in the meantime filled)container 1. After this has taken place the closure is located in the situation shown in fig. 2. In this position thescrew threads - As a result of temporary and localised heat application, for instance with hot air, to the sealing
ring 8, for instance a heat pulse of approximately 1 sec. at a temperature of roughly 300°C, the sealingring 8 is caused to shrink. Via the situation shown in fig. 3 the situation of fig. 4 is eventually reached in which the sealingring 8 grips beneath thelocking collar 5. As can be seen from the transition from fig. 2 to fig. 4 a stretching of the breakingportions 13 takes place through the shrinkage of the sealingring 8. This stretching is of importance in ensuring that the breakingportions 13 can be broken with a smaller force. This aspect is of particular importance in the case of stronger plastics such as polypropylene. - Fig. 5 shows in more detail a number of features of this embodiment, to which the invention is not limited. Also indicated in this figure by way of example are several dimensions in mm. As can be seen from the figure, each breaking
portion 13 also extends as a rib over at least a considerable part of the outer surface of the associatedbridge portion 12.
Claims (2)
- A container with closure, comprising:- a container (1) with
an opening (2);
a substantially cylindrical wall portion (3) adjoining this opening;
at least one screw thread (4) present on the outside thereof, and
a locking collar (5) present on the side of this screw thread facing away from the opening;- a plastic screw cap (6) made from a heat-shrinkable material and consisting of one whole and manufactured by injection moulding and having
internal screw thread (7) co-acting with the thread (4) present on the container;
a sealing ring (8) shrunk by heating and gripping on the side of said locking collar facing away from said opening (2);
a number of connections (9) in spread positions between said sealing ring (8) and an inside lower edge zone (10) of said screw cap (6);
characterized in that
a protective edge (11) is extending axially from the lower edge zone (10) of said screw cap (6), covering at least a portion of said connections; and in that each connection comprises: a bridge portion (12) moulded onto said sealing ring (8) on the side towards the screw cap (6) and having radial and axial dimensions in the same order of magnitude as those of said sealing ring (8); and
a breaking portion (13) extending between that bridge portion (12) and said inside lower edge zone (10) of said screw cap and having a smaller cross-sectional surface area than said bridge portion (12), which breaking portions (13) are covered off by said protective edge,
whereby, prior to the shrinking process and after the screwing of said screw cap (6) into position on the container said sealing ring (8) is situated on an axial position relative to said locking collar (5) such that during shrinking of said sealing ring under the influence of localised temporary heat application the shrinking forces thereby occurring cause a tensile stress in said connections (9) such that said breaking portions (13) undergo a stretching with associated cross-sectional surface area reduction. - Closure as claimed in claim 1, characterized in that each breaking portion (13) also extends over at least a considerable part of the outer surface of the associated bridge portion (12).
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT89202672T ATE94833T1 (en) | 1988-10-25 | 1989-10-20 | ORIGINALITY CLOSURE. |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
NL8802618A NL8802618A (en) | 1988-10-25 | 1988-10-25 | WARRANTY CLOSURE. |
NL8802618 | 1988-10-25 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0366198A1 EP0366198A1 (en) | 1990-05-02 |
EP0366198B1 true EP0366198B1 (en) | 1993-09-22 |
Family
ID=19853107
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP89202672A Expired - Lifetime EP0366198B1 (en) | 1988-10-25 | 1989-10-20 | Tamper-evident closure |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP0366198B1 (en) |
AT (1) | ATE94833T1 (en) |
DE (1) | DE68909363T2 (en) |
ES (1) | ES2044066T3 (en) |
NL (1) | NL8802618A (en) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20070131642A1 (en) * | 2003-12-12 | 2007-06-14 | Human Jan P | Tamper evident closures for containers |
JP6442415B2 (en) | 2012-12-27 | 2018-12-19 | ジーイー・ヘルスケア・アクスイェ・セルスカプ | Open container cap assembly |
JP6188262B1 (en) | 2016-09-30 | 2017-08-30 | 大王製紙株式会社 | Wet seat storage container |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CH505005A (en) * | 1968-03-30 | 1971-03-31 | Ciba Geigy Ag | Process for the production of a guarantee closure and guarantee closure produced according to this process |
FR2421119A1 (en) * | 1978-03-28 | 1979-10-26 | Captocap Ltd | INVIOLABLE PLASTIC CAP |
-
1988
- 1988-10-25 NL NL8802618A patent/NL8802618A/en not_active Application Discontinuation
-
1989
- 1989-10-20 EP EP89202672A patent/EP0366198B1/en not_active Expired - Lifetime
- 1989-10-20 ES ES89202672T patent/ES2044066T3/en not_active Expired - Lifetime
- 1989-10-20 DE DE89202672T patent/DE68909363T2/en not_active Expired - Fee Related
- 1989-10-20 AT AT89202672T patent/ATE94833T1/en not_active IP Right Cessation
Also Published As
Publication number | Publication date |
---|---|
DE68909363T2 (en) | 1994-01-13 |
NL8802618A (en) | 1990-05-16 |
EP0366198A1 (en) | 1990-05-02 |
ES2044066T3 (en) | 1994-01-01 |
DE68909363D1 (en) | 1993-10-28 |
ATE94833T1 (en) | 1993-10-15 |
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