EP1503941B1 - Composite stopper made of synthetic materials - Google Patents
Composite stopper made of synthetic materials Download PDFInfo
- Publication number
- EP1503941B1 EP1503941B1 EP03722898A EP03722898A EP1503941B1 EP 1503941 B1 EP1503941 B1 EP 1503941B1 EP 03722898 A EP03722898 A EP 03722898A EP 03722898 A EP03722898 A EP 03722898A EP 1503941 B1 EP1503941 B1 EP 1503941B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- rings
- elastic rings
- pair
- elastic
- stopper 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.)
- Expired - Lifetime
Links
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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
- B65D39/00—Closures arranged within necks or pouring openings or in discharge apertures, e.g. stoppers
- B65D39/0005—Closures arranged within necks or pouring openings or in discharge apertures, e.g. stoppers made in one piece
- B65D39/0011—Closures arranged within necks or pouring openings or in discharge apertures, e.g. stoppers made in one piece from natural or synthetic cork, e.g. for wine bottles or the like
-
- 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
- B65D39/00—Closures arranged within necks or pouring openings or in discharge apertures, e.g. stoppers
- B65D39/0052—Closures arranged within necks or pouring openings or in discharge apertures, e.g. stoppers made in more than one piece
- B65D39/0058—Closures arranged within necks or pouring openings or in discharge apertures, e.g. stoppers made in more than one piece from natural or synthetic cork, e.g. for wine bottles or the like
-
- 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
- B65D2539/00—Details relating to closures arranged within necks or pouring openings or in discharge apertures, e.g. stoppers
- B65D2539/001—Details of closures arranged within necks or pouring opening or in discharge apertures, e.g. stoppers
- B65D2539/006—Details of closures arranged within necks or pouring opening or in discharge apertures, e.g. stoppers provided with separate sealing rings
Abstract
Description
- The present invention is applicable in general in the field of stoppers for bottles and similar containers and relates in particular to a composite stopper made of synthetic materials according to the preamble of Claim 1.
- In the wine-making industry, the most widely known stoppers for bottles are traditional stoppers made of cork.
- Although for the user cork stoppers are synonymous with quality, the industry is starting to use stoppers made of plastic material. Research has led to a new generation of stoppers, made of various types of thermoplastic materials, such as polypropylene. Some synthetic stoppers comprise thermoplastic polyolefins, thermoplastic rubbers and wax-based additives. Stoppers made of thermoplastic materials have a number of objective advantages.
- The increase in demand for cork and the limited resources available make cork stoppers increasingly expensive. On the other hand, the base materials for synthetic stoppers are practically inexhaustible. In addition to this, the methods for manufacturing them may be automated easily, making the unit cost of a synthetic stopper highly competitive.
- Cork stoppers may have internal cavities and suffer from flaking owing to their structural form and also, in some cases, poor drying. Synthetic stoppers, however, are made of thermoplastic material and have a coherent mass owing to the raw materials which have a constant density and compression during the moulding step. These differences in characteristics result, only in the case of cork stoppers, to oxidation and lack of uniform vinification between bottles in the same batch.
- Cork has an elastic hysteresis curve with a long recovery time, meaning it is slow to recover its original volume following the compression undergone during bottling. On the other hand, the plastic materials generally used in this sector have a much faster hysteresis curve. This means that bottles with cork stoppers may loose some of the liquid inside immediately after bottling and must be kept at an angle and in a damp environment in order to assist the absorption of moisture by the stopper and its consequent expansion. Bottles with synthetic stoppers, however, may be handled immediately after bottling and may be stored in a vertical position, saving space and volume, and do not require a damp environment.
- The structure and shape of cork stoppers depend on numerous factors, including the region of origin, the thickness and density of the bark, the ageing after harvesting and the degree of processing and finishing. Stoppers which are nominally identical, but which in practice differ notably from each other, create problems during the automatic bottling step and are unpredictable as regards sealing of the bottled product over time. Stoppers made of plastic material are generally manufactured by means of injection moulding with dimensional tolerances smaller than those of cork and using a highly repeatable process. This ensures more reliable results as regards automatic handling of the stoppers and constant sealing of the bottled wine over time.
- Cork is an organic material and, as such, may in many cases be attacked by mould. The smell of mould contaminates the contents of the bottle with an incidence which varies between 0.5% and 10%. The plastic materials used to make stoppers, however, are inert and free from contamination.
- In practice, it has been observed that well-known synthetic stoppers, such as that described in US patent No. 5,496,862, despite having numerous advantages compared to cork stoppers, have a lower sealing action in the long term. Cork has the advantage that, in the presence of external moisture and a damp surrounding environment, it expands until it adheres completely to the inner walls of the bottle. Ordinary stoppers made of thermoplastic material only absorb moisture in negligible quantities and can only rely on their intrinsic resillence to adhere to the inner walls of the bottle. Gaps are therefore created between the stopper and the glass wall and, via them, oxygen is able to filter from the surrounding atmosphere into the bottle.
- US patent No. 5,904,965 describes a synthetic-material stopper which is formed by a rigid inner portion and a covering layer having a greater density and may be engaged in the neck of the bottle by means of friction. This solution, in addition to being expensive, does not completely eliminate the formation of gaps between the stopper and the glass, and therefore oxidation of the buttle's contents.
- US patent No. 6,179,138, European patent No. 0,629,559 and French patent No. 2,731,677 describe stoppers which have on their external surfaces annular elements able to interact with the inner wall of the bottle and prevent oxygen from entering the bottle.
- A limitation of these solutions consists in the fact that the annular elements are all made from the same material and sometimes from the same material used for the central portion of the stopper.
- In order to guarantee tho sealing action, the material used for said annular elements must therefore embrace various properties, such as high elasticity, low gas permeability, high compatibility for alimentary use and a cost which is not excessively high. It is difficult to achieve a good compromise between these properties without affecting the sealing action of the stopper.
- The document US 5,665,462, which is considered to represent the closest prior art, discloses a composite stopper (a stopper with O-ring) made of synthetic materials, particularly for bottles and similar containers, comprising a substantially cylindrical central body made of thermoplastic material and defining a longitudinal axis, with a side surface and two substantially flat end faces, and at least two elastic rings located in corresponding annular seats on said side surface. The claimed invention differs from such embodiment because the elastic rings are made of plastic materials which are different from each other and from the base material of the central body.
- A primary object of the present invention is that of eliminating the abovementioned drawbacks by providing a stopper made of plastic material, which stopper is effective and has a relatively low unit cost.
- A particular object is that of providing a stopper which has optimum features as regards sealing action, prevention of loss of the liquid contents and instantaneous elastic recovery after bottling.
- A further object of the invention is that of providing a stopper which allows the bottles to be laid down or handled immediately after bottling and be stored in avertical position, saving space and volume.
- A further particular object is that of providing a stopper which does not require a damp environment in order to guarantee the sealing action preventing the passage of air and gas.
- A further object of the invention is that of providing a stopper whose dimensions, surface characteristics and compactness are repeatable and suitable for automatic handling.
- These objects, together with others which appear more clearly hereinafter, are achieved, according to Claim 1, by a composite stopper made of synthetic materials, in particular for bottles and similar containers, comprising a substantially cylindrical central body made of thermoplastic material and defining a longitudinal axis, with a side surface and two substantially flat end faces, and at least two elastic rings located in corresponding annular seats on said side surface, characterized in that the elastic rings are made of elastomeric materials which are different from each other and from the base material of the central body, the base materials of the elastic rings are non-toxic and at least one of them is made of nitrile rubber and the other of silicone rubber.
- Preferred embodiments are set forth in the dependent claims.
- Owing to this particular configuration, it is possible to reconcile in a single composite stopper different characteristics, such as a high sealing action against air and gas, total compatibility for alimentary use, optimum tolerances in terms of dimensions and form, and structural compactness.
- Preferably, the minimum diameter of the annular seats is slightly greater than the inner diameter of the elastic rings at rest. In this way, the elastic rings are retained in the corresponding annular seats without adhesives and only by virtue of their elastic properties.
- Thanks to these features, it is possible to provide a composite stopper which is devoid of any type of adhesive and, therefore, has a high compatibility for alimentary use and is easy to assemble.
- Moreover, with said configuration, it is possible to obtain a stopper which, owing to its own elasticity, adapts its shape rapidly to the neck of the bottle and ensures that there are no losses immediately after bottling.
- Further features and advantages of the invention will be more clearly understood from the detailed description of a number of preferred but not exclusive embodiments of the stopper according to the invention, illustrated by way of a nonlimiting example with the aid of the accompanying figures, in which:
- Fig. 1 shows a side view, in partial cross section, of the stopper according to the invention as a whole;
- Fig. 2 shows a cross-sectional side view of a component of the stopper according to the invention;
- Fig. 3 shows a side view of another component of the stopper according to the invention.
- With particular reference to the abovementioned figures, a stopper is shown according to the invention, denoted in its entirety by reference number 1 and suitable in particular for bottles and similar containers.
- The stopper 1 comprises a substantially cylindrical
central body 2 made of thermoplastic material defining a longitudinal axis L. Thiscentral body 2 has a side surface 3 and two substantiallyflat end faces 4, 4' which are mutually parallel and perpendicular to the axis L. At least twoelastic rings annular seats 7, 7' on the side surface 3. Saidelastic rings - The
central body 2 and the twoelastic rings central body 2 is made of thermoplastic material, preferably polypropylene, while a nitrile rubber is used for theelastic ring 5 and a silicone rubber for thering 6. - The nitrile rubber used is a butadiene/acrylonitrile copolymer and is such that it ensures optimum air and gas impermeability. Further formulations are possible in order to increase in particular the gas impermeability of the nitrile rubber. The silicone rubber used is a polysiloxane polymer and has a formulation able to guarantee complete compatibility for alimentary use, a very high resistance to ageing, physiological and biological non-toxicity, and almost total resistance to micro-organisms, such as bacteria and fungi.
- The
elastic rings annular seats 7, 7'. During assembly of the stopper, theelastic rings seats 7, 7', where they remain elastically under tension owing to the fact that the internal diameter DI of theelastic rings annular seats 7, 7'. Theelastic rings seats 7, 7' only by virtue of their elastic properties and the use of any adhesive is not envisaged. - The
elastic ring 5 made of nitrile rubber and theelastic ring 6 made of silicone rubber form afirst pair 8 of elastic rings arranged longitudinally staggered at a predetermined distance. Preferably, thepair 8 ofelastic rings flat faces 4, 4' of thecentral body 2. - In addition to the
first pair 8, the stopper 1 comprises a further elastic ring 9 made of nitrile rubber and a furtherelastic ring 10 made of silicone rubber. These furtherelastic rings 9, 10 are arranged longitudinally staggered at a predetermined distance in two furtherannular seats 11, 11' on the side surface 3 so as to form asecond pair 12 ofelastic rings 9, 10. Thesecond pair 12 is positioned on the side surface 3 so as to form a mirror image of thepair 8 of elastic rings with respect to a central plane P of saidcentral body 2, said central plane being parallel to saidflat faces 4, 4'. This means that the twopairs central body 2. This mirror-image arrangement of the twopairs rings 5, 9 and therings - The
elastic rings pairs elastic rings 5, 9 made of nitrile rubber. - From an operational point of view, the stopper 1 is inserted by means of pressure into the neck of the container or bottle so that all the
elastic rings elastic rings annular seats elastic rings - At this point, it is possible to understand why the
elastic rings elastic rings 5, 9 made of nitrile rubber, have been positioned at the ends. In this way, when the stopper 1 is inserted, the liquid contained may only come into contact with one of the twoelastic rings elastic rings elastic rings 5, 9 made of nitrile rubber, however, are distinguished by their optimum air and gas impermeability and may therefore perform their tasks in an optimum manner when positioned further inside longitudinally. - From what has been described above, it is clear that the stopper according to the invention achieves the predetermined objects and, in particular, guarantees a high performance in terms of sealing action and preventing losses of the liquid inside the bottle. Moreover, the stopper has a low unit cost because it may be manufactured easily and handled automatically, and its manufacturing process results in low dimensional tolerances, a reduced number of rejects and low degree of non-conformity.
Claims (10)
- Composite stopper (1) made of synthetic materials, particularly for bottles and similar containers, comprising a substantially cylindrical central body (2) made of thermoplastic material and defining a longitudinal axis (L), with a side surface (3) and two substantially flat end faces (4, 4'), and at least two elastic rings (5, 6) located in corresponding annular seats (7, 7') on said side surface (3), characterized in that said at least two elastic rings (5, 6) are made of plastic materials which are different from each other and from the base material of said central body (2), the base materials of said at least two elastic rings (5, 6) are non-toxic at least one of said elastic rings (5, 6) is made of nitrile rubber having a formulation able to ensure optimum gas impermeability, and at least the other of said elastic rings (5, 6) is made of silicone rubber having a formulation able to ensure complete compatibility for alimentary use and a high resistance to ageing.
- Stopper according to Claim 1, characterized in that the minimum diameter (DM) of said annular seats (7, 7') is slightly greater than the inner diameter (DI) of said elastic rings (5, 6) at rest.
- Stopper according to Claim 2, characterized in that said elastic rings (5, 6) are retained in said annular seats (7, 7') without adhesives by their own elastic properties.
- Stopper according to Claim 1, characterized in that said at least two elastic rings (5, 6) comprise at least one first pair (8) of rings which are longitudinally staggered and located at a predetermined distance, one ring (5) of said pair (8) being made of nitrile rubber and the other (6) being made of silicone rubber.
- Stopper according to Claim 4, characterized in that said first pair (8) of elastic rings (5, 6) is located close to one of said end faces (4, 4').
- Stopper according to Claim 5, characterized in that said at least two rings comprise at least one second pair (12) of rings (9, 10) which are longitudinally staggered and located at a distance similar to that of the first pair (8), one ring (9) of said second pair (12) being made of nitrile rubber and the other (10) being made of silicone rubber.
- Stopper according to Claim 6, characterized in that said predetermined distance between the rings (6, 6, 9, 10) of said first and second pair (8, 12) is relatively small with respect to the total length of said central body (2).
- Stopper according to Claim 7, characterized in that said first and second pair (8, 12) of rings (5, 6, 9, 10) are arranged in substantially symmetrical positions with respect to a central plane (P) of said central body (2), said central plane being substantially perpendicular to said longitudinal axis (L).
- Stopper according to claim 8, characterized in that the elastic lings (6, 10) made of silicone rubber of, said first and said second pair (8, 12) are closer to said end faces (4, 4') than the elastic rings (5, 9) made of nitrile rubber of the same pairs (8, 12).
- Stopper according to Claim 1, characterized in that the material of said central body (2) is polypropylene.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
IT2002VI000088A ITVI20020088A1 (en) | 2002-05-08 | 2002-05-08 | COMPOSITE CAP IN SYNTHETIC MATERIALS |
ITVI20020088 | 2002-05-08 | ||
PCT/IB2003/001783 WO2003095318A2 (en) | 2002-05-08 | 2003-05-08 | Composite stopper made of synthetic materials |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1503941A2 EP1503941A2 (en) | 2005-02-09 |
EP1503941B1 true EP1503941B1 (en) | 2006-04-12 |
Family
ID=29416489
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP03722898A Expired - Lifetime EP1503941B1 (en) | 2002-05-08 | 2003-05-08 | Composite stopper made of synthetic materials |
Country Status (10)
Country | Link |
---|---|
US (1) | US20050173371A1 (en) |
EP (1) | EP1503941B1 (en) |
CN (1) | CN1652979A (en) |
AT (1) | ATE323033T1 (en) |
AU (1) | AU2003230057A1 (en) |
DE (1) | DE60304570D1 (en) |
IT (1) | ITVI20020088A1 (en) |
RU (1) | RU2004132184A (en) |
WO (1) | WO2003095318A2 (en) |
ZA (1) | ZA200408433B (en) |
Families Citing this family (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
ES2299340B1 (en) * | 2006-04-18 | 2009-04-01 | Edmundo Rodriguez Bombin | CONDITIONING PLUG. |
ES2349100B1 (en) * | 2009-01-14 | 2011-10-24 | Sistemas Especiales De Inyeccion (S.E.I.) S.L. | BOTTLE PLUG. |
US9199768B1 (en) | 2015-02-11 | 2015-12-01 | Ryan M. Casey | Two-piece stopper |
ITUB20155962A1 (en) * | 2015-11-27 | 2017-05-27 | Candusso Aldo | "COMPOSITE CAP FOR BOTTLES, IN PARTICULAR OF WINE, WITH BARRIQUE EFFECT" |
WO2017159623A1 (en) * | 2016-03-18 | 2017-09-21 | 日本ゼオン株式会社 | Nitrile rubber composition and rubber cross-linked product |
US10597199B1 (en) * | 2016-07-01 | 2020-03-24 | Christopher Joseph Manning | Closure and an assembly of the closure with a container |
CN110803390A (en) * | 2019-11-26 | 2020-02-18 | 湖北辰诺医药包装科技有限公司 | Rubber plug for in-vitro diagnostic reagent bottle and preparation method thereof |
US11760541B2 (en) | 2021-06-25 | 2023-09-19 | Phillip James Fricano | Tamper resistant reusable wine bottle stopper compatible with cork-screw-extractors |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3434615A (en) * | 1967-09-11 | 1969-03-25 | Int Equipment Co | Centrifuge bottle and closure therefor |
US4420076A (en) * | 1982-06-29 | 1983-12-13 | Beveridge Lois M | Moisture resistant, quick release pill container |
WO1995025674A1 (en) * | 1994-03-18 | 1995-09-28 | Dewar, Diane | Interlocked fibre stopper |
DE29501432U1 (en) * | 1995-01-30 | 1995-06-08 | Schima Mirko | Wine or champagne bottle stopper |
AT404317B (en) * | 1996-08-02 | 1998-10-27 | Greiner & Soehne C A | LOCKING DEVICE, DISCONNECTING DEVICE AND RECEIVING CONTAINER FOR A RECEIVING DEVICE |
DE60004029T2 (en) * | 1999-02-02 | 2004-05-06 | Royal Packaging Industries Van Leer N.V. | CONTAINER CLOSURE |
US6478178B2 (en) * | 2001-03-08 | 2002-11-12 | Donald C. Montgomery | Fermentation lock for wine barrel |
-
2002
- 2002-05-08 IT IT2002VI000088A patent/ITVI20020088A1/en unknown
-
2003
- 2003-05-08 DE DE60304570T patent/DE60304570D1/en not_active Expired - Fee Related
- 2003-05-08 AU AU2003230057A patent/AU2003230057A1/en not_active Abandoned
- 2003-05-08 RU RU2004132184/12A patent/RU2004132184A/en not_active Application Discontinuation
- 2003-05-08 AT AT03722898T patent/ATE323033T1/en not_active IP Right Cessation
- 2003-05-08 EP EP03722898A patent/EP1503941B1/en not_active Expired - Lifetime
- 2003-05-08 US US10/513,981 patent/US20050173371A1/en not_active Abandoned
- 2003-05-08 CN CNA038104490A patent/CN1652979A/en active Pending
- 2003-05-08 WO PCT/IB2003/001783 patent/WO2003095318A2/en not_active Application Discontinuation
-
2004
- 2004-10-19 ZA ZA200408433A patent/ZA200408433B/en unknown
Also Published As
Publication number | Publication date |
---|---|
DE60304570D1 (en) | 2006-05-24 |
EP1503941A2 (en) | 2005-02-09 |
ATE323033T1 (en) | 2006-04-15 |
WO2003095318A3 (en) | 2004-03-04 |
WO2003095318A2 (en) | 2003-11-20 |
CN1652979A (en) | 2005-08-10 |
US20050173371A1 (en) | 2005-08-11 |
AU2003230057A1 (en) | 2003-11-11 |
ITVI20020088A1 (en) | 2003-11-10 |
ZA200408433B (en) | 2005-09-27 |
RU2004132184A (en) | 2005-06-27 |
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