WO2000040472A1 - Screw cap with applied bung - Google Patents

Screw cap with applied bung Download PDF

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Publication number
WO2000040472A1
WO2000040472A1 PCT/EP2000/000042 EP0000042W WO0040472A1 WO 2000040472 A1 WO2000040472 A1 WO 2000040472A1 EP 0000042 W EP0000042 W EP 0000042W WO 0040472 A1 WO0040472 A1 WO 0040472A1
Authority
WO
WIPO (PCT)
Prior art keywords
bung
annular
cap according
slot
cap
Prior art date
Application number
PCT/EP2000/000042
Other languages
French (fr)
Inventor
Fiorenzo Parrinello
Original Assignee
Sacmi Cooperativa Meccanici Imola S.C.R.L.
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 Sacmi Cooperativa Meccanici Imola S.C.R.L. filed Critical Sacmi Cooperativa Meccanici Imola S.C.R.L.
Priority to AU21058/00A priority Critical patent/AU2105800A/en
Publication of WO2000040472A1 publication Critical patent/WO2000040472A1/en

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
    • B65D41/045—Discs
    • 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
    • B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
    • B29C43/32—Component parts, details or accessories; Auxiliary operations
    • B29C43/36—Moulds for making articles of definite length, i.e. discrete articles
    • B29C43/361—Moulds for making articles of definite length, i.e. discrete articles with pressing members independently movable of the parts for opening or closing the mould, e.g. movable pistons
    • B29C2043/3615—Forming elements, e.g. mandrels or rams or stampers or pistons or plungers or punching devices
    • 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
    • B29L2001/00—Articles provided with screw threads

Definitions

  • the present invention relates to a screw cap with applied bung.
  • Background art Caps of the above type are already known commercially. They comprise a cylindrical cup which is internally threaded in order to be screwed so as to close a container (bottle) and is normally provided with a tamper-evident ring which is attached to the edge of the cup and can be cut when the cap is unscrewed from the container.
  • a circular bung made of flexible material is applied to the bottom of the cup and forms a seal against the rim of the container when the cap is applied.
  • annular lip which protrudes from the cylindrical wall of the cup and has an inside diameter which is smaller than the outside diameter of the bung.
  • the annular lip accordingly forms an annular cavity or slot into which the bung is forced so that its peripheral edge remains engaged in said annular slot.
  • the slot In order to allow the bung to be inserted in the slot, the slot must be significantly larger in diameter and height than the bung. Accordingly, the bung can move on the bottom and remain off-center with respect to the cap, with the risk of compromising the seal against the rim of the mouth of the container. Disclosure of the Invention
  • the aim of the present invention is to obviate the above-mentioned drawback of conventional caps, providing a solution wherein the bung is always perfectly centered on the bottom of the cap and can therefore ensure hermetic closure of the container.
  • This aim is achieved with a screw cap with applied bung, composed of a cylindrical cup which is provided with an internal thread and with an annular lip which protrudes inward from a wall of the cup, proximate to a bottom of the cup, and forms, together with said bottom, an annular slot, characterized in that it comprises a circular bung having a peripheral edge engaged in said slot and provided with at least one annular ridge which protrudes axially and is centered in said annular lip, said bung being significantly thinner than the height of the annular slot.
  • Figure 1 is a sectional view of a cap according to the invention.
  • Figure 2 is an enlarged-scale view of a detail of Figure 1
  • Figure 3 is an enlarged-scale view of the detail of Figure 2 after application to close a container
  • Figures 4 and 5 are views of the cap of Figure 1 in two successive steps of the application of the bung;
  • Figure 6 is an enlarged-scale sectional view of a detail of a second embodiment of the cap.
  • the reference numeral 1 generally designates the cap as a whole.
  • the cap comprises a cylindrical cup 2 which is composed of a cylindrical wall 3 and of a bottom 4.
  • a tamper-evident ring 5 is attached to the cylindrical wall 3 and is internally provided with elements 6 for engaging a collar of the container whereto the cap is to be applied.
  • the wall 3 is internally provided with a thread 7 by means of which the cap 1 is screwed so as to close the mouth of the container.
  • An annular lip 8 protrudes internally from the wall 3, in the region between the thread 7 and the bottom 4, and is substantially equal in height to the thread 7.
  • the annular lip 8 forms, in the wall 3, an annular slot or cavity 9 which is blended with the bottom 4.
  • the peripheral edge 10 of a bung 11 is inserted in the slot 9; the bung is constituted by a flat disk and is preferably made of flexible plastic material.
  • the bung 11 has a smooth and flat face 12 which is directed toward the bottom 4, whereas an annular ridge 14 protrudes axially from the peripheral region of the opposite face 13.
  • the ridge 14 is formed by an outer wall 15 and by an adjacent conical inner wall 16 which is inclined toward the wall 3.
  • the outer wall 15 is substantially cylindrical and its diameter is slightly smaller than the inside diameter of the lip 8. Furthermore, the ridge 14 has such a height, measured at right angles to the face 13, as to protrude with minimal play inside the opening surrounded by the annular lip 8.
  • the ridge 14 accordingly keeps the bung 11 perfectly centered inside the cap 1, so that when the cap 1 is applied to the container, the outer edge of the rim 17 of the container remains substantially aligned with the conical wall 16, allowing the ridge 14 to lock onto the outer edge of the rim 17 of the container.
  • the bung 11 has a diameter and a thickness which are significantly smaller than the diameter and, respectively, the axial height of the slot 9 (i.e., than the distance between the bottom 4 and the annular lip 8), so as to produce a play which is sufficient to make it less troublesome to insert the bung in the slot 9 and allow easy unscrewing of the cap.
  • a main feature of the present invention consists in that the reduced thickness of the bung 11 with respect to the axial height of the slot 9 allows easy insertion of the bung in the slot 9 by means of a central plunger 18, which pushes the bung in the central region of the cap 1 (as shown by Figure 1), and by means of an outer bush 19 which completes the insertion by acting on the ridge 14 (as shown by Figure 5).
  • a central plunger 18 which pushes the bung in the central region of the cap 1 (as shown by Figure 1)
  • an outer bush 19 which completes the insertion by acting on the ridge 14 (as shown by Figure 5).
  • the plunger 18 there are holes 20 which are connected to a suction source in order to retain the bung 1 during insertion in the cap.
  • the pressure with which the cap 1 is applied to the container produces the deformation of the ridge 14 so as to fill the slot 9 and wrap around the rim of the container and thus provide a perfect seal. It should also be observed that the cap is particularly easy to unscrew thanks to flat shape of the bung and of the play which it has in the cup.
  • a second ridge 21 which is located further inward (see Figure 6).
  • the ridges 14 and 21 by being mutually concentric, form a channel 22 which can be engaged by the rim of the container, so as to provide a seal of the rim both at the outer edge and at the inner edge.
  • a bung 11 which is capable of constituting a barrier against the penetration of oxygen inside the container.
  • such barrier can be constituted by material which is impermeable to gases, particularly oxygen, such as for example PVDC (polyvinylidene chloride) or EVOH (polyvinyl alcohol) or a layer of aluminum.
  • the bung is provided by means of conventional polymers with the addition of so-called oxygen-scavenging substances, i.e., substances capable of trapping oxygen, such as for example sodium ascorbate or sodium sulfite.

Abstract

A screw cap with applied bung, comprising a cylindrical cup (2) which is provided with an internal thread and with an annular lip (8) which protrudes inward from a wall (3) of the cup, proximate to a bottom (4) of the cup, and forms, together with said bottom, an annular slot (9), further comprising a circular bung (11) having a peripheral edge engaged in said slot (9) and provided with at least one annular ridge (14) which protrudes axially and is centered in said annular lip (8), said bung (11) being significantly thinner than the height of the annular slot (9).

Description

SCREW CAP WITH APPLIED BUNG Technical field
The present invention relates to a screw cap with applied bung. Background art Caps of the above type are already known commercially. They comprise a cylindrical cup which is internally threaded in order to be screwed so as to close a container (bottle) and is normally provided with a tamper-evident ring which is attached to the edge of the cup and can be cut when the cap is unscrewed from the container. In order to provide hermetic closure of the container, a circular bung made of flexible material is applied to the bottom of the cup and forms a seal against the rim of the container when the cap is applied. In order to retain the bung inside the cap, in the region between the bottom of the cup and the thread there is an annular lip which protrudes from the cylindrical wall of the cup and has an inside diameter which is smaller than the outside diameter of the bung.
The annular lip accordingly forms an annular cavity or slot into which the bung is forced so that its peripheral edge remains engaged in said annular slot. In order to allow the bung to be inserted in the slot, the slot must be significantly larger in diameter and height than the bung. Accordingly, the bung can move on the bottom and remain off-center with respect to the cap, with the risk of compromising the seal against the rim of the mouth of the container. Disclosure of the Invention
The aim of the present invention is to obviate the above-mentioned drawback of conventional caps, providing a solution wherein the bung is always perfectly centered on the bottom of the cap and can therefore ensure hermetic closure of the container. This aim is achieved with a screw cap with applied bung, composed of a cylindrical cup which is provided with an internal thread and with an annular lip which protrudes inward from a wall of the cup, proximate to a bottom of the cup, and forms, together with said bottom, an annular slot, characterized in that it comprises a circular bung having a peripheral edge engaged in said slot and provided with at least one annular ridge which protrudes axially and is centered in said annular lip, said bung being significantly thinner than the height of the annular slot. Brief description of the drawings
Further characteristics and advantages of the present invention will become apparent from the following detailed description of a preferred embodiment, illustrated only by way of non-limitative example in the accompanying drawings, wherein:
Figure 1 is a sectional view of a cap according to the invention;
Figure 2 is an enlarged-scale view of a detail of Figure 1; Figure 3 is an enlarged-scale view of the detail of Figure 2 after application to close a container;
Figures 4 and 5 are views of the cap of Figure 1 in two successive steps of the application of the bung;
Figure 6 is an enlarged-scale sectional view of a detail of a second embodiment of the cap.
Wavs of carrying out the Invention
With reference to Figures 1 to 4, the reference numeral 1 generally designates the cap as a whole. The cap comprises a cylindrical cup 2 which is composed of a cylindrical wall 3 and of a bottom 4. A tamper-evident ring 5 is attached to the cylindrical wall 3 and is internally provided with elements 6 for engaging a collar of the container whereto the cap is to be applied.
The wall 3 is internally provided with a thread 7 by means of which the cap 1 is screwed so as to close the mouth of the container. An annular lip 8 protrudes internally from the wall 3, in the region between the thread 7 and the bottom 4, and is substantially equal in height to the thread 7.
The annular lip 8 forms, in the wall 3, an annular slot or cavity 9 which is blended with the bottom 4. The peripheral edge 10 of a bung 11 is inserted in the slot 9; the bung is constituted by a flat disk and is preferably made of flexible plastic material.
The bung 11 has a smooth and flat face 12 which is directed toward the bottom 4, whereas an annular ridge 14 protrudes axially from the peripheral region of the opposite face 13. The ridge 14 is formed by an outer wall 15 and by an adjacent conical inner wall 16 which is inclined toward the wall 3. The outer wall 15 is substantially cylindrical and its diameter is slightly smaller than the inside diameter of the lip 8. Furthermore, the ridge 14 has such a height, measured at right angles to the face 13, as to protrude with minimal play inside the opening surrounded by the annular lip 8.
The ridge 14 accordingly keeps the bung 11 perfectly centered inside the cap 1, so that when the cap 1 is applied to the container, the outer edge of the rim 17 of the container remains substantially aligned with the conical wall 16, allowing the ridge 14 to lock onto the outer edge of the rim 17 of the container.
Conveniently, the bung 11 has a diameter and a thickness which are significantly smaller than the diameter and, respectively, the axial height of the slot 9 (i.e., than the distance between the bottom 4 and the annular lip 8), so as to produce a play which is sufficient to make it less troublesome to insert the bung in the slot 9 and allow easy unscrewing of the cap.
A main feature of the present invention consists in that the reduced thickness of the bung 11 with respect to the axial height of the slot 9 allows easy insertion of the bung in the slot 9 by means of a central plunger 18, which pushes the bung in the central region of the cap 1 (as shown by Figure 1), and by means of an outer bush 19 which completes the insertion by acting on the ridge 14 (as shown by Figure 5). Advantageously, in the plunger 18 there are holes 20 which are connected to a suction source in order to retain the bung 1 during insertion in the cap.
It should be observed that the pressure with which the cap 1 is applied to the container produces the deformation of the ridge 14 so as to fill the slot 9 and wrap around the rim of the container and thus provide a perfect seal. It should also be observed that the cap is particularly easy to unscrew thanks to flat shape of the bung and of the play which it has in the cup.
Numerous modifications and variations are possible in the practical embodiment of the invention. For example, in addition to the ridge 14 it is possible to provide a second ridge 21 which is located further inward (see Figure 6). The ridges 14 and 21, by being mutually concentric, form a channel 22 which can be engaged by the rim of the container, so as to provide a seal of the rim both at the outer edge and at the inner edge. Another embodiment uses a bung 11 which is capable of constituting a barrier against the penetration of oxygen inside the container. For example, such barrier can be constituted by material which is impermeable to gases, particularly oxygen, such as for example PVDC (polyvinylidene chloride) or EVOH (polyvinyl alcohol) or a layer of aluminum. In a further embodiment, the bung is provided by means of conventional polymers with the addition of so-called oxygen-scavenging substances, i.e., substances capable of trapping oxygen, such as for example sodium ascorbate or sodium sulfite.
The disclosures in Italian Utility Model Application No. BO99U000001 from which this application claims priority are incorporated herein by reference.

Claims

CLAIMS 1. A screw cap with applied bung, comprising a cylindrical cup (2) which is provided with an internal thread (7) and with an annular lip (8) which protrudes inward from a wall (3) of the cup, proximate to a bottom (4) of the cup, and forms, together with said bottom, an annular slot (9), characterized in that it comprises a circular bung (11) having a peripheral edge engaged in said slot (9) and provided with at least one annular ridge (14) which protrudes axially and is centered in said annular lip (8), said bung (11) being significantly thinner than the height of the annular slot (9).
2. The cap according to claim 1, characterized in that said ridge (14) has an outer wall (15) which is substantially cylindrical and slightly smaller in diameter than the inside diameter of said annular lip (8), said ridge (14) having such an axial height as to protrude with minimal play into the opening enclosed by said annular lip (8), so as to keep the bung (11) perfectly centered inside the cap (1).
3. The cap according to claim 1, characterized in that two mutually concentric annular ridges (14, 21) protrude axially from the peripheral edge of the bung (11) and form an intermediate slot (22) adapted to be aligned with a rim (17) of a mouth of a container.
4. The cap according to claim 1, characterized in that said circular bung
(11) has a flat face which is directed toward the bottom (4) of the cup (2) and a peripheral rim (10) protruding outward from said annular ridge (14).
5. The cap according to claim 4, characterized in that the peripheral rim (10) of said circular bung (11) is engaged in the slot (9) with a minimal play which is sufficient to allow said bung (11) to rotate inside said annular slot
(9).
6. The cap according to claim 1, characterized in that said bung (11) comprises a material adapted to form a barrier against the penetration of gas inside the container.
7. The cap according to claim 6, characterized in that said material is a multilayer type material.
8. The cap according to claim 7, characterized in that said material is PVDC or EVOH or a layer of aluminum.
9. The cap according to claim 1, characterized in that said bung (11) is provided by means of polymers with the addition of oxygen-scavenging substances.
10. The cap according to claim 6, characterized in that said barrier is arranged between said bottom (4) and said bung (11).
PCT/EP2000/000042 1999-01-05 2000-01-05 Screw cap with applied bung WO2000040472A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU21058/00A AU2105800A (en) 1999-01-05 2000-01-05 Screw cap with applied bung

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITBO990001 IT247417Y1 (en) 1999-01-05 1999-01-05 SCREW CAPSULE WITH SEALED.
ITBO99U000001 1999-01-05

Publications (1)

Publication Number Publication Date
WO2000040472A1 true WO2000040472A1 (en) 2000-07-13

Family

ID=11343587

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2000/000042 WO2000040472A1 (en) 1999-01-05 2000-01-05 Screw cap with applied bung

Country Status (3)

Country Link
AU (1) AU2105800A (en)
IT (1) IT247417Y1 (en)
WO (1) WO2000040472A1 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002100735A1 (en) * 2001-06-08 2002-12-19 Alcoa Deutschland Gmbh Closure for containers
DE102015016460B3 (en) * 2015-12-21 2017-05-04 Carl Freudenberg Kg Closure body for beverage bottles
US11208314B2 (en) 2015-01-30 2021-12-28 Anheuser-Busch Inbev S.A. Pressurized beverage concentrates and appliances and methods for producing beverages therefrom

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US768389A (en) 1903-02-26 1904-08-23 Hoechst Ag Cyclogeraniolidenacetone and process of making same.
US4480752A (en) 1982-08-09 1984-11-06 Bemis Company, Inc. Pinch closure bags with opening feature and method of manufacturing them
US4588100A (en) * 1984-01-18 1986-05-13 Japan Crown Cork Co., Ltd. Pilfer-proof plastic closure for containers
WO1987006914A1 (en) * 1986-05-12 1987-11-19 Boardman Molded Products, Inc. Floating cap seal
EP0636550A1 (en) * 1993-07-26 1995-02-01 BORMIOLI METALPLAST S.p.A. Cap for bottles containing carbonated liquids
EP0693434A1 (en) * 1994-07-20 1996-01-24 Rical S.A. Screw cap with liner
EP0799772A1 (en) * 1996-04-03 1997-10-08 Weiss K.G. Plastic screw cap and method for manufacturing the same
WO1998026991A1 (en) * 1996-12-17 1998-06-25 Japan Crown Cork Co., Ltd. Synthetic resin container lid having tamper evident characteristics
EP0987187A1 (en) * 1998-09-16 2000-03-22 Novembal (Société Anonyme) Closure cap with seal, method for making the same and assembly comprising a container and the closure with seal

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US768389A (en) 1903-02-26 1904-08-23 Hoechst Ag Cyclogeraniolidenacetone and process of making same.
US4480752A (en) 1982-08-09 1984-11-06 Bemis Company, Inc. Pinch closure bags with opening feature and method of manufacturing them
US4588100A (en) * 1984-01-18 1986-05-13 Japan Crown Cork Co., Ltd. Pilfer-proof plastic closure for containers
WO1987006914A1 (en) * 1986-05-12 1987-11-19 Boardman Molded Products, Inc. Floating cap seal
EP0636550A1 (en) * 1993-07-26 1995-02-01 BORMIOLI METALPLAST S.p.A. Cap for bottles containing carbonated liquids
EP0693434A1 (en) * 1994-07-20 1996-01-24 Rical S.A. Screw cap with liner
EP0799772A1 (en) * 1996-04-03 1997-10-08 Weiss K.G. Plastic screw cap and method for manufacturing the same
WO1998026991A1 (en) * 1996-12-17 1998-06-25 Japan Crown Cork Co., Ltd. Synthetic resin container lid having tamper evident characteristics
EP0987187A1 (en) * 1998-09-16 2000-03-22 Novembal (Société Anonyme) Closure cap with seal, method for making the same and assembly comprising a container and the closure with seal

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002100735A1 (en) * 2001-06-08 2002-12-19 Alcoa Deutschland Gmbh Closure for containers
US11208314B2 (en) 2015-01-30 2021-12-28 Anheuser-Busch Inbev S.A. Pressurized beverage concentrates and appliances and methods for producing beverages therefrom
DE102015016460B3 (en) * 2015-12-21 2017-05-04 Carl Freudenberg Kg Closure body for beverage bottles

Also Published As

Publication number Publication date
IT247417Y1 (en) 2002-08-22
ITBO990001U1 (en) 2000-07-05
AU2105800A (en) 2000-07-24

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