CA2049041A1 - Screw cap with warranty ring - Google Patents
Screw cap with warranty ringInfo
- Publication number
- CA2049041A1 CA2049041A1 CA002049041A CA2049041A CA2049041A1 CA 2049041 A1 CA2049041 A1 CA 2049041A1 CA 002049041 A CA002049041 A CA 002049041A CA 2049041 A CA2049041 A CA 2049041A CA 2049041 A1 CA2049041 A1 CA 2049041A1
- Authority
- CA
- Canada
- Prior art keywords
- screw cap
- wedges
- wedge
- cap
- cap according
- 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.)
- Abandoned
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- 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
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/40—Removing or ejecting moulded articles
- B29C45/44—Removing or ejecting moulded articles for undercut articles
- B29C45/4407—Removing or ejecting moulded articles for undercut articles by flexible movement of undercut portions of the articles
-
- 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
- B65D41/3404—Threaded or like caps or cap-like covers provided with tamper elements formed in, or attached to, the closure skirt with ratchet-and-pawl mechanism between the container and the closure skirt or the tamper element
- B65D41/3409—Threaded or like caps or cap-like covers provided with tamper elements formed in, or attached to, the closure skirt with ratchet-and-pawl mechanism between the container and the closure skirt or the tamper element the tamper element being integrally connected to the closure by means of bridges
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2031/00—Other particular articles
- B29L2031/56—Stoppers or lids for bottles, jars, or the like, e.g. closures
- B29L2031/565—Stoppers or lids for bottles, jars, or the like, e.g. closures for containers
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Closures For Containers (AREA)
- Agricultural Chemicals And Associated Chemicals (AREA)
Abstract
- 10 -Abstract The warranty ring (1) on the screw cap disclosed has, on the inside (8), retention elements shaped like surface-mounted wedges (9) which taper in the direction (A) in which the cap is screwed off. The wedges act to ease the passage of the warranty ring over the container bulge (17) without excessive friction, as well as strengthening the ring. (Fig. 3)
Description
W~ 91/1~369 PCT/C~91/00022 Screw Cap with Warranty Ring The invention concerns a screw cap for closure of a container opening, according to the preamble of Claim 1. These types of screw caps perform a warranty function, in that initial removal of the cap is displayed through a tearing-away of the warranty strip. The retention elements, on initial screwing-on of the cap, engage under the container bead and can, howe~er, no longer slide over the bead on initial unscrewing, so that the warranty strip tears away There are already numerous different versions of retention elements known. Thus, inwardly protruding tongues or also beads are used, for example, which block the warranty strip when unscrewing for the first time. Shaping of the entire wall of the warranty strip, in cross section, in such a way that it forms numerous inward pointing indentations is also known, as is described, for example, in EP-A-337 0~6.
A problem with all related screw caps of comparable design is that the retention elements on the one hand must possess sufficient flexibility in order that screwing on of the cap is possible, and that on the other hand they must be solid and stiff enough to bring about a tearing-away of the warranty strip when unscrewing. Finally, the entire arrangement must also be easily ejectable from an injection molding tool with axially opening parts, since undercuttings are only permitted to a limited extent.
21~.9~
It is therefore a purpose of the invention to create a screw cap of the type mentioned in the introduction, with which the retention elements permit themselves to be slid over the container bead without excessive expansion of the warranty strip, whereby reliable blocking of the warranty strip is ensured as soon as the screw cap has reached its final position. This purpose is solved with a screw cap according to the invention, which exhibits the features of Claim 1.
The wedges, which taper in the direction of screwing on, offer only slight resistance to the screwing-on movement. The slipping behaviour in the closure direction is of particular advantage, whilst the recoiling faces of the wedges have a blocking effect in the direction of unscrewing. Since the wedges are positioned upon the inner wall, they additionally stiffen the warranty strip, whereby the ability to tamper with the strip is greatly reduced~
Both the side flanks of the wedge are preferably inclined relative to the inner wall. In the case of the lower side flank which is aligned towards the lower edge of the warranty strip, this causes a centralising of the strip during screwing-on, and a gentle expansion over the container bead. ~n the case of the side flank aligned towards the cap base, the inclination causes easier ejection from the injection molding tool.
The side flanks of the wedge oriented towards the cap base are inclined at an angle relative to a plane running a right angles to the middle axis of the screw cap with particular advantage.
With that, the inclined position of the side flanks can correspond approximately to that of the helix angle of the pitch of the cap thread. This configuration has the result that the side flanks will not engage with a sudden spring action under the bead, but will rather slide beneath the bead in accordance with the chosen inclination.
Further advantages can be achieved if material beads which protrude above the wedge surface are arranged on the side flanks of the wedges oriented towards the cap base. As opposed to the rest of the wedge body/ these edge beads are relatively flexible and can easily bend backwards on initial screwing-on of the cap. In spite of that, they increase the engagement depth of the entire retention element.
The shape and number of wedges is in each case adjusted to the specific relationships, respectively other dimensions of the screw cap. Preferably, however, the wedge extends over at least half of the total height of the warranty strip. Good stiffening of the warranty strip is achieved through this axial expansion of the retention elements. The ma~imum wedge thickness can be at least the same or greater than the thickness of the rest of the warranty strip. The spacing between the individual wedges should be such that the individual wedges can achieve optimum effect and that a certain circumEerential elasticity can still be maintained. The spacing between the individual wedges should for this reason at least correspond to the total length of a wedge.
The material beads on the side flank of the wedges, as mentioned above, are formed with particular advantage immediately on ejection from the tool, without the need for a negative bead shape on a tool component. The side flanks of the wedge oriented towards the cap base must merely be inclined in such a way that the material beads form themselves through squeezing of the material when the inner tool part which forms the inner wall of the warranty strip retracts away from the wedge, with the plastic material being in a condition which is not yet fully solidified. According to the chosen inclination, a somewhat larger or smaller material deformation of the material can be achieved.
~n embodiment of the invention is portrayed in the drawings and will be more closely described in the following. Namely:
igure 1 a cross-section through a screw cap placed upon a container opening, with the features of the invention.
igure 2 a view of the screw cap from below, according to figure 1 igure 3 a cxoss-section through the warranty strip in a greatly enlarged scale, and igure 4 a plan view of a wedge in the axial direction of the screw cap.
Figures 1 and 2 show the screw cap enlarged several times. It comprises, in a known way, an approximately cylindrical cap side wall 2 with an internal thread 4. On the cap base 3, an inner seal is arranged which can, however, have another desired configuration or which can be replaced by a seal insert r for example. On the lower edge of the cap 6 a one piece warranty strip 1 is arranged on numerous tear-off connecting ribs 7.
Numerous wedges 9, which taper in the screwing-on direction A, are positioned upon the inner wall 8 of the warranty strip at regular intervals. After the initial screwing-on of the cap~
these wedges serve as retention elements which engage under a surrounding container bead 17 on a container opening 15r The container opening is provided with an external thread 16 and the screw caps are screwed onto the container in a known way with the aid of special screwing-on devices.
As can be observed in figure 2, eight wedges 9 can, for example, be arranged at regular intervals in the line of the circumference. In the case of closure caps for mineral water bottles, this number has shown itself to be of particular advantage. Naturally, either more or fewer wedges can be arranged, depending on the total circumference of the warranty strip. In certain cases it would be even conceivable for the wedges to be arranged at irregular intervals. Details of the wedge configuration can be observed in figures 3 and 4.
Accordingly here, the individual wedges have an angle Alpha, which ensures gentle engagement. The wedge surfaces 14 can be shaped either flat or curved. The wedge face 12 runs preferably radially outwards, but could however be inclined.
The upper side flank 10, oriented towards the cap base 3, is inclined at an angle Gamma to the inner wall of the warranty strip. This inclined position of less than 90 ensures axial ejection from the inside of the tool mold inspite of the undercutting formed by the side flank 10. The lower side flank 11 is inclined at a somewhat more acute angle Delta, so that the wedges slide easily over the container bead.
~ Q ~
The upper side flanks 10 do not run parallel to the lower edge 6 of the cap, but at the angle seta, inclined to a plane running at rightangles to the middle axis of the cap. This angle can approximately correspond to the helix angle of the pitch of the internal thread 4, thus approx. 2 degrees 30 minutes. The side flank 10 slides in this way beneath the container bead 17 in a particularly gentle way.
A material bead 13, which protrudes over the wedge surface, can be arranged in the transitional area between the side flank 10 and the wedge surface 14. This bead improves the retention properties of the wedgel but is not absolutely necessary. The bead 13 can be created without a special negative shape on the tool through correct choice of the angle Gamma. During retraction of the inner tool component, with a molding compound in a relatively plastic condition, squeezing of the material will occur in accordance with the dimensions of the wedge, and this will result in a useable bead. The screw cap is manufactured from a known plastic material such as, for example, Polyethylene or Polypropylene.
A problem with all related screw caps of comparable design is that the retention elements on the one hand must possess sufficient flexibility in order that screwing on of the cap is possible, and that on the other hand they must be solid and stiff enough to bring about a tearing-away of the warranty strip when unscrewing. Finally, the entire arrangement must also be easily ejectable from an injection molding tool with axially opening parts, since undercuttings are only permitted to a limited extent.
21~.9~
It is therefore a purpose of the invention to create a screw cap of the type mentioned in the introduction, with which the retention elements permit themselves to be slid over the container bead without excessive expansion of the warranty strip, whereby reliable blocking of the warranty strip is ensured as soon as the screw cap has reached its final position. This purpose is solved with a screw cap according to the invention, which exhibits the features of Claim 1.
The wedges, which taper in the direction of screwing on, offer only slight resistance to the screwing-on movement. The slipping behaviour in the closure direction is of particular advantage, whilst the recoiling faces of the wedges have a blocking effect in the direction of unscrewing. Since the wedges are positioned upon the inner wall, they additionally stiffen the warranty strip, whereby the ability to tamper with the strip is greatly reduced~
Both the side flanks of the wedge are preferably inclined relative to the inner wall. In the case of the lower side flank which is aligned towards the lower edge of the warranty strip, this causes a centralising of the strip during screwing-on, and a gentle expansion over the container bead. ~n the case of the side flank aligned towards the cap base, the inclination causes easier ejection from the injection molding tool.
The side flanks of the wedge oriented towards the cap base are inclined at an angle relative to a plane running a right angles to the middle axis of the screw cap with particular advantage.
With that, the inclined position of the side flanks can correspond approximately to that of the helix angle of the pitch of the cap thread. This configuration has the result that the side flanks will not engage with a sudden spring action under the bead, but will rather slide beneath the bead in accordance with the chosen inclination.
Further advantages can be achieved if material beads which protrude above the wedge surface are arranged on the side flanks of the wedges oriented towards the cap base. As opposed to the rest of the wedge body/ these edge beads are relatively flexible and can easily bend backwards on initial screwing-on of the cap. In spite of that, they increase the engagement depth of the entire retention element.
The shape and number of wedges is in each case adjusted to the specific relationships, respectively other dimensions of the screw cap. Preferably, however, the wedge extends over at least half of the total height of the warranty strip. Good stiffening of the warranty strip is achieved through this axial expansion of the retention elements. The ma~imum wedge thickness can be at least the same or greater than the thickness of the rest of the warranty strip. The spacing between the individual wedges should be such that the individual wedges can achieve optimum effect and that a certain circumEerential elasticity can still be maintained. The spacing between the individual wedges should for this reason at least correspond to the total length of a wedge.
The material beads on the side flank of the wedges, as mentioned above, are formed with particular advantage immediately on ejection from the tool, without the need for a negative bead shape on a tool component. The side flanks of the wedge oriented towards the cap base must merely be inclined in such a way that the material beads form themselves through squeezing of the material when the inner tool part which forms the inner wall of the warranty strip retracts away from the wedge, with the plastic material being in a condition which is not yet fully solidified. According to the chosen inclination, a somewhat larger or smaller material deformation of the material can be achieved.
~n embodiment of the invention is portrayed in the drawings and will be more closely described in the following. Namely:
igure 1 a cross-section through a screw cap placed upon a container opening, with the features of the invention.
igure 2 a view of the screw cap from below, according to figure 1 igure 3 a cxoss-section through the warranty strip in a greatly enlarged scale, and igure 4 a plan view of a wedge in the axial direction of the screw cap.
Figures 1 and 2 show the screw cap enlarged several times. It comprises, in a known way, an approximately cylindrical cap side wall 2 with an internal thread 4. On the cap base 3, an inner seal is arranged which can, however, have another desired configuration or which can be replaced by a seal insert r for example. On the lower edge of the cap 6 a one piece warranty strip 1 is arranged on numerous tear-off connecting ribs 7.
Numerous wedges 9, which taper in the screwing-on direction A, are positioned upon the inner wall 8 of the warranty strip at regular intervals. After the initial screwing-on of the cap~
these wedges serve as retention elements which engage under a surrounding container bead 17 on a container opening 15r The container opening is provided with an external thread 16 and the screw caps are screwed onto the container in a known way with the aid of special screwing-on devices.
As can be observed in figure 2, eight wedges 9 can, for example, be arranged at regular intervals in the line of the circumference. In the case of closure caps for mineral water bottles, this number has shown itself to be of particular advantage. Naturally, either more or fewer wedges can be arranged, depending on the total circumference of the warranty strip. In certain cases it would be even conceivable for the wedges to be arranged at irregular intervals. Details of the wedge configuration can be observed in figures 3 and 4.
Accordingly here, the individual wedges have an angle Alpha, which ensures gentle engagement. The wedge surfaces 14 can be shaped either flat or curved. The wedge face 12 runs preferably radially outwards, but could however be inclined.
The upper side flank 10, oriented towards the cap base 3, is inclined at an angle Gamma to the inner wall of the warranty strip. This inclined position of less than 90 ensures axial ejection from the inside of the tool mold inspite of the undercutting formed by the side flank 10. The lower side flank 11 is inclined at a somewhat more acute angle Delta, so that the wedges slide easily over the container bead.
~ Q ~
The upper side flanks 10 do not run parallel to the lower edge 6 of the cap, but at the angle seta, inclined to a plane running at rightangles to the middle axis of the cap. This angle can approximately correspond to the helix angle of the pitch of the internal thread 4, thus approx. 2 degrees 30 minutes. The side flank 10 slides in this way beneath the container bead 17 in a particularly gentle way.
A material bead 13, which protrudes over the wedge surface, can be arranged in the transitional area between the side flank 10 and the wedge surface 14. This bead improves the retention properties of the wedgel but is not absolutely necessary. The bead 13 can be created without a special negative shape on the tool through correct choice of the angle Gamma. During retraction of the inner tool component, with a molding compound in a relatively plastic condition, squeezing of the material will occur in accordance with the dimensions of the wedge, and this will result in a useable bead. The screw cap is manufactured from a known plastic material such as, for example, Polyethylene or Polypropylene.
Claims (10)
1. Screw cap for closure of a container opening, with a warranty strip (1), which is able to tear away, which is arranged on the lower edge of the cap and which is intended to engage beneath an annular bead (17) on the container opening when the cap is screwed-on and which, for this purpose, exhibits on the inner wall (8) numerous retention elements which are aligned towards the middle axis of the screw cap and which engage under the bead during the initial screwing-on of the cap when the final position is reached, characterized in that the retention elements are formed as wedges (9) positioned on the inner wall (8) which taper in the direction (A) of screwing-on.
2. Screw cap according to Claim 1, characterized in that both the side flanks (10, 11) of the wedge (9) are inclined relative to the inner wall (8).
3. Screw cap according to Claims 1 or 2, characterized in that the towards the cap base (3) oriented side flanks (10) of the wedges (9) are inclined in relation to a plane running at rightangles to the middle axis of the screw cap.
4. Screw cap according to Claim 3, characterized in that the towards the cap base oriented side flanks of the wedges exhibit an inclination which approximately corresponds to the helix angle of the pitch of the cap thread.
5. Screw cap according to one of the Claims 1 to 4, characterized in that material beads (13), protruding over the wedge surface (14) towards the middle axis, are arranged on the towards the cap base oriented side flanks (10) of the wedge.
6. Screw cap according to one of the Claims 1 to 5, characterized in that the wedges (9) extend over at least half of the total height of the warranty strip (1).
7. Screw cap according to one of the Claims 1 to 6, characterized in that the maximum wedge thickness is at least the same or larger than the wall thickness of the rest of the warranty strip.
8. Screw cap according to one of the Claims 1 to 7, characterized in that the individual wedges in the line of the circumference are arranged at a distance from one another which at least corresponds to the total length of a wedge.
9. Screw cap according to one of the claims 1 to 8, characterized in that at least eight wedges are arranged in the line of the circumference.
10. Method of manufacture of a screw cap according to Claim 5 from plastic material in an injection molding tool with inner and outer tool components which are able to be displaced axially in relation to one another for the formation of a mold cavity, characterized in that the to the cap base oriented side flanks (10) of the wedges (9) are inclined in such a way that, with the retraction away from the wedge of the inner tool component which forms the inner wall of the warranty strip when the plastic material is not in a fully solidified condition, material beads (13) will be formed which protrude over the wedge surface (14) towards the middle axis.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CH34190 | 1990-02-02 | ||
| CH341/90 | 1990-02-02 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2049041A1 true CA2049041A1 (en) | 1991-08-03 |
Family
ID=4184808
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002049041A Abandoned CA2049041A1 (en) | 1990-02-02 | 1991-01-25 | Screw cap with warranty ring |
Country Status (7)
| Country | Link |
|---|---|
| EP (1) | EP0466856B1 (en) |
| AT (1) | ATE105810T1 (en) |
| AU (1) | AU7057891A (en) |
| CA (1) | CA2049041A1 (en) |
| DE (1) | DE59101649D1 (en) |
| ES (1) | ES2053319T3 (en) |
| WO (1) | WO1991011369A1 (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB9205375D0 (en) * | 1992-03-12 | 1992-04-22 | Metal Closures Group Ltd | Container closures |
| FR2721282B1 (en) * | 1994-06-21 | 1996-12-27 | Moulage Automatique Sa | Improvement to a manufacturing process of a plugging device and machine for its implementation. |
| US7637384B2 (en) | 2002-08-09 | 2009-12-29 | Crown Packaging Technology, Inc. | Tamper evident closure with locking band and container therefor |
| US20040045925A1 (en) | 2002-09-11 | 2004-03-11 | Seidita Thomas M. | Tamper evident closure with locking band |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2416849A1 (en) * | 1978-02-09 | 1979-09-07 | Patel Chandrakant | Tamper-proof container closure - has inner skirt attached to body by shear segments and engageable under collar on container neck |
| GB8319263D0 (en) * | 1983-07-15 | 1983-08-17 | Johnsen Jorgensen Plastics Ltd | Tamper-resistant container assembly |
| GB8622252D0 (en) * | 1986-09-16 | 1986-10-22 | Nat Plastics Ltd | Container closure |
| FR2619552B1 (en) * | 1987-08-18 | 1990-02-02 | Astra Plastique | SCREW CAP WITH A SECURITY BELT, OF THE TYPE UNMOLDED BY UNSCREWING, AND MOLD USED FOR THE MANUFACTURE OF THIS CAP |
| DE8806295U1 (en) * | 1987-12-19 | 1988-10-06 | Delmenhorster Korkfabrik Arthur Linck Gmbh & Co Kg, 2870 Delmenhorst, De | |
| IT1224357B (en) * | 1988-04-13 | 1990-10-04 | Bormioli Metalplast Spa | ONE-PIECE CAPSULE WITH DEFORMABLE INVIOLABILITY CLAMP |
| US4846361A (en) * | 1988-08-01 | 1989-07-11 | Owens-Illinois Closure Inc. | Tamper-indicating closure for a container and improved capping without top loading |
| GB8822444D0 (en) * | 1988-09-23 | 1988-10-26 | Johnsen Jorgensen Plastics Ltd | Improved tamper-resistant container assembly |
-
1991
- 1991-01-25 AT AT91902651T patent/ATE105810T1/en not_active IP Right Cessation
- 1991-01-25 CA CA002049041A patent/CA2049041A1/en not_active Abandoned
- 1991-01-25 WO PCT/CH1991/000022 patent/WO1991011369A1/en not_active Application Discontinuation
- 1991-01-25 ES ES91902651T patent/ES2053319T3/en not_active Expired - Lifetime
- 1991-01-25 DE DE59101649T patent/DE59101649D1/en not_active Revoked
- 1991-01-25 AU AU70578/91A patent/AU7057891A/en not_active Abandoned
- 1991-01-25 EP EP91902651A patent/EP0466856B1/en not_active Revoked
Also Published As
| Publication number | Publication date |
|---|---|
| WO1991011369A1 (en) | 1991-08-08 |
| DE59101649D1 (en) | 1994-06-23 |
| ES2053319T3 (en) | 1994-07-16 |
| AU7057891A (en) | 1991-08-21 |
| EP0466856B1 (en) | 1994-05-18 |
| EP0466856A1 (en) | 1992-01-22 |
| ATE105810T1 (en) | 1994-06-15 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Discontinued | ||
| FZDE | Discontinued |
Effective date: 19980126 |