WO1999058410A1 - Bouchon a vis presentant une gorge destinee a recevoir un joint et moule pour realiser un tel bouchon - Google Patents
Bouchon a vis presentant une gorge destinee a recevoir un joint et moule pour realiser un tel bouchon Download PDFInfo
- Publication number
- WO1999058410A1 WO1999058410A1 PCT/FR1999/001060 FR9901060W WO9958410A1 WO 1999058410 A1 WO1999058410 A1 WO 1999058410A1 FR 9901060 W FR9901060 W FR 9901060W WO 9958410 A1 WO9958410 A1 WO 9958410A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- groove
- skirt
- mold
- thread
- rib
- Prior art date
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
- B65D41/0435—Threaded or like caps or cap-like covers secured by rotation with separate sealing elements
Definitions
- Screw cap having a groove intended to receive a seal and mold for producing such a cap
- the present invention relates to a screw cap having a circular groove at its threaded skirt, as well as a mold for making such a cap.
- screw caps having a bottom and a skirt extending axially from this bottom.
- a thread is produced on the inner wall of the skirt and near the bottom there is produced a circular groove intended in particular to receive an attached seal or obturator. Thanks to the gasket or the shutter, it is possible to achieve a gas and liquid tightness.
- a first method consists in demolding by force the thread of the plug and the groove by stripping.
- the mold has a core which is inside the plug when the material is injected into the mold.
- the cap is translated without rotating. There is then a deformation of the part due to the tearing of the core.
- the throat, as well as the threads, are deformed.
- this demolding process requires the use of a flexible or semi-rigid synthetic material.
- a second demolding process uses a mold by an eclipsable core known to a person skilled in the art under the name of demolding of the DME type.
- the release is then carried out by a retraction of mechanical elements of a core requiring a combination of movements in the mold.
- a central core is first removed then core sectors are retracted and finally the part is ejected.
- a mold can be used in which the threaded core can be unscrewed. To then be able to unmold the circular groove, it is known to extend the thread of the core as far as the upper groove of the core. There is then, during the unscrewing of the core, a significant deformation of the molded part in the region of the groove. To limit deformation, it is known to provide groove sectors rather than having a continuous groove around the entire circumference of the bottom of the plug.
- the present invention aims to provide a screw cap having a bottom and a skirt having an internal thread extending axially relative to the bottom, a circular groove being provided in the plug near the bottom thereof, which can be demolded without having the aforementioned drawbacks.
- a plug of this type is therefore desired which is slightly deformed during demolding and which does not use a complex and / or fragile mold and / or source of friction.
- the screw cap which it offers is of the type comprising a bottom from which extends a axially extending skirt having an internal thread, a substantially circular rib delimiting a groove produced in the skirt on the side of the bottom of the cap, as well as notches and / or mortises making it possible to avoid rotation of the plug when the latter is removed from the mold.
- the internal thread of the skirt approaches the rib without, however, opening into the latter.
- the net is demolded by unscrewing, which is ideal for avoiding any deformation of the thread, and the groove is demolded by local deformation of the undercut area.
- unscrewing which is ideal for avoiding any deformation of the thread
- the groove is demolded by local deformation of the undercut area.
- the height of the rib delimiting the groove and corresponding to the undercut of the latter is less than the height measured radially of the thread of the skirt.
- the groove is advantageously less deep than the thread is protruding.
- the skirt thread preferably approaches at most one millimeter from the circular rib.
- the distance separating the end of the thread from the circular rib is therefore preferably less than one millimeter. This distance must not be zero because otherwise there are the drawbacks of the prior art, but it must not be too large to promote good deformation without creating too many constraints.
- the present invention also provides a mold for producing a screw cap comprising a bottom from which extends a skirt axially provided with an internal thread, a substantially circular groove produced in the skirt on the side of the bottom of the cap, as well as notches and / or mortises making it possible to avoid rotation of the plug when the latter is removed from the mold.
- This mold has a mold bottom, the inner wall of which corresponds to the outer surface of the skirt and of the bottom, as well as a core intended to be removed by unscrewing, having a net-shaped groove and a circular groove corresponding to the rib. circular plug.
- the net-shaped groove approaches the circular groove without opening into it.
- This mold allows the production of a plug as described above.
- the circular groove is less deep than the net-shaped groove.
- the net-like groove preferably approaches within one millimeter of the circular groove.
- the distance between this net-shaped groove and the circular groove is therefore preferably between zero and one millimeter.
- Figure 1 is a longitudinal sectional view of a plug according to the invention.
- Figure 2 is a side view of a mold core for producing the plug of Figure 1.
- Figure 1 shows a screw cap having a bottom 2 from which extends a peripheral skirt 4 axially.
- the inner surface of the skirt 4 has a thread 6 allowing the cap to be screwed onto the neck of a bottle or the like provided with a corresponding thread.
- a peripheral rib is produced parallel to this bottom, thus forming between this rib 8 and the bottom 2 a groove 10.
- the latter is intended to receive a seal or a shutter (not shown). In this way, it is possible to perfect the sealing of the plug and to make it leaktight in particular to gases and liquids.
- a cap of this type can for example be used for corking bottles containing a carbonated drink.
- the thread 6 of the skirt 4 approaches the peripheral rib 8 but stops so that there remains a free space of width a between this thread 6 and the peripheral rib 8.
- the width a is for example 0, 5 mm.
- notches 12 and notches 14 follow one another over the entire periphery of the skirt 4. These notches 12 and notches 14 make it possible to maintain the plug and d '' prevent it from turning when the cap is removed from the mold by unscrewing the inner core.
- FIG. 2 represents the core 16 as well as an anti-rotation ring 18 of a mold for molding the plug presented in FIG. 1.
- the upper part of the core 16 corresponds to the groove 10 of the plug.
- a peripheral groove 20 corresponds to the peripheral rib 8 of the plug.
- a helical groove 22 which corresponds to the thread 6 of the skirt 4 of the plug.
- the helical groove 22 of the core does not open into the peripheral groove 20 of this core.
- the anti-rotation ring 18 surrounds the core 16. It has notches 24 and notches 26 which correspond respectively to the notches 12 and notches 14 of the plug.
- the core 16 and the anti-rotation ring 18 are placed in a mold and synthetically is injected. A plug is then formed as shown in FIG. 1 with a bottom, a skirt, a net, a groove and notches and notches.
- the anti-rotation ring is held fixed to prevent any rotation of the plug and the core is unscrewed.
- the end of the thread 6 located near the peripheral rib 8 will come out of the helical groove 22 of the core thus locally deforming the plug in a direction which promotes the demolding of the peripheral rib 8.
- the deformation progresses peripherally, thus allowing a gradual demolding of the peripheral rib 8.
- a plug is obtained in which the peripheral rib 8 has an edge well parallel to the bottom 2.
- the peripheral rib 8 has an edge well parallel to the bottom 2.
- the invention is not limited to the embodiment described above by way of nonlimiting example; on the contrary, it embraces all variants thereof within the framework of the claims indicated below. So for example, the notches and notches of the cap and the anti-rotation ring could be replaced by tenons and mortises, the tenons being for example at the level of the anti-rotation ring and the mortises at the level of the plug or vice versa.
- the cap shown has only one thread. It would not go beyond the scope of the invention if the stopper had several threads.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Closures For Containers (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
- Tables And Desks Characterized By Structural Shape (AREA)
- Confectionery (AREA)
Abstract
Description
Claims
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU35279/99A AU3527999A (en) | 1998-05-13 | 1999-05-04 | Screw top with a groove for receiving a joint and mould for producing such a top |
MXPA00011142A MXPA00011142A (es) | 1998-05-13 | 1999-05-04 | Tapa de rosca que presenta una ranura destinada a recibir una junta y molde para fabricar dicha tapa. |
EP99916989A EP1077882B1 (fr) | 1998-05-13 | 1999-05-04 | Bouchon a vis presentant une gorge destinee a recevoir un joint et moule pour realiser un tel bouchon |
DE69909778T DE69909778D1 (de) | 1998-05-13 | 1999-05-04 | Schraubkappe mit einer rille zur aufnahme einer dichtung und form zum herstellen einer solchen schraubkappe |
AT99916989T ATE245574T1 (de) | 1998-05-13 | 1999-05-04 | Schraubkappe mit einer rille zur aufnahme einer dichtung und form zum herstellen einer solchen schraubkappe |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR98/06266 | 1998-05-13 | ||
FR9806266A FR2778641B1 (fr) | 1998-05-13 | 1998-05-13 | Bouchon a vis presentant une gorge destinee a recevoir un joint et moule pour realiser un tel bouchon |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1999058410A1 true WO1999058410A1 (fr) | 1999-11-18 |
Family
ID=9526470
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/FR1999/001060 WO1999058410A1 (fr) | 1998-05-13 | 1999-05-04 | Bouchon a vis presentant une gorge destinee a recevoir un joint et moule pour realiser un tel bouchon |
Country Status (7)
Country | Link |
---|---|
EP (1) | EP1077882B1 (fr) |
AT (1) | ATE245574T1 (fr) |
AU (1) | AU3527999A (fr) |
DE (1) | DE69909778D1 (fr) |
FR (1) | FR2778641B1 (fr) |
MX (1) | MXPA00011142A (fr) |
WO (1) | WO1999058410A1 (fr) |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0067650A1 (fr) * | 1981-06-08 | 1982-12-22 | Tredegar Molded Products Company | Capsule de bouchage à bague de garantie |
EP0168982A1 (fr) * | 1984-07-18 | 1986-01-22 | W.R. Grace & Co.-Conn. | Fermeture préfiletée pour un récipient |
EP0355235A1 (fr) * | 1987-08-18 | 1990-02-28 | ASTRA PLASTIQUE Société Anonyme | Moule utilisé pour la fabrication d'un bouchon à vis à ceinture d'inviolabilité, du type démoulé par dévissage |
EP0521389A1 (fr) * | 1991-06-29 | 1993-01-07 | Alcoa Deutschland GmbH Verpackungswerke | Capuchon de fermeture en matière plastique pour récipients, muni d'un élément de garantie |
US5281385A (en) * | 1992-10-21 | 1994-01-25 | Sunbeam Plastics Corporation | Injection molding system for threaded tamper indicating closures |
-
1998
- 1998-05-13 FR FR9806266A patent/FR2778641B1/fr not_active Expired - Fee Related
-
1999
- 1999-05-04 EP EP99916989A patent/EP1077882B1/fr not_active Expired - Lifetime
- 1999-05-04 WO PCT/FR1999/001060 patent/WO1999058410A1/fr active IP Right Grant
- 1999-05-04 DE DE69909778T patent/DE69909778D1/de not_active Expired - Lifetime
- 1999-05-04 AU AU35279/99A patent/AU3527999A/en not_active Abandoned
- 1999-05-04 MX MXPA00011142A patent/MXPA00011142A/es active IP Right Grant
- 1999-05-04 AT AT99916989T patent/ATE245574T1/de not_active IP Right Cessation
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0067650A1 (fr) * | 1981-06-08 | 1982-12-22 | Tredegar Molded Products Company | Capsule de bouchage à bague de garantie |
EP0168982A1 (fr) * | 1984-07-18 | 1986-01-22 | W.R. Grace & Co.-Conn. | Fermeture préfiletée pour un récipient |
EP0355235A1 (fr) * | 1987-08-18 | 1990-02-28 | ASTRA PLASTIQUE Société Anonyme | Moule utilisé pour la fabrication d'un bouchon à vis à ceinture d'inviolabilité, du type démoulé par dévissage |
EP0521389A1 (fr) * | 1991-06-29 | 1993-01-07 | Alcoa Deutschland GmbH Verpackungswerke | Capuchon de fermeture en matière plastique pour récipients, muni d'un élément de garantie |
US5281385A (en) * | 1992-10-21 | 1994-01-25 | Sunbeam Plastics Corporation | Injection molding system for threaded tamper indicating closures |
Also Published As
Publication number | Publication date |
---|---|
AU3527999A (en) | 1999-11-29 |
FR2778641A1 (fr) | 1999-11-19 |
EP1077882A1 (fr) | 2001-02-28 |
ATE245574T1 (de) | 2003-08-15 |
FR2778641B1 (fr) | 2000-06-16 |
DE69909778D1 (de) | 2003-08-28 |
EP1077882B1 (fr) | 2003-07-23 |
MXPA00011142A (es) | 2004-10-14 |
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