WO1990011232A1 - Couvercle a vis en materiau thermoplastique - Google Patents

Couvercle a vis en materiau thermoplastique Download PDF

Info

Publication number
WO1990011232A1
WO1990011232A1 PCT/EP1990/000485 EP9000485W WO9011232A1 WO 1990011232 A1 WO1990011232 A1 WO 1990011232A1 EP 9000485 W EP9000485 W EP 9000485W WO 9011232 A1 WO9011232 A1 WO 9011232A1
Authority
WO
WIPO (PCT)
Prior art keywords
cap
washer
seat
container
annular rib
Prior art date
Application number
PCT/EP1990/000485
Other languages
English (en)
Inventor
Mario Margaria
Original Assignee
Alplast S.P.A.
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 Alplast S.P.A. filed Critical Alplast S.P.A.
Publication of WO1990011232A1 publication Critical patent/WO1990011232A1/fr

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
    • B65D41/0442—Collars or rings

Definitions

  • the present invention relates to a screw cap which is produced by the injection moulding of thermoplastics material and has a horizontal end wall, a cylindrical skirt with internal threading for the screwing of the cap on to the externally-threaded neck of a container by means of a screw-capping machine, and an annular sealing washer made from a plastisol which, after moulding of the cap, is cast in an annular seat and polymerised by heating, the seat being defined by a peripheral annular portion of the internal surface of the horizontal end wall of the cap, by an annular rib which projects from the internal surface, and by a substantially triangular-section annular rib which projects radially from the top of the internal surface of the cylindrical skirt of the cap.
  • the cap may be overtightened, that is, it may be rotated through a greater angle than the predetermined angle relative to the container neck so that the internal surface of the horizontal wall of the cap is brought into contact with the end face of the mouth of the container.
  • the washer is cut by the container neck and split into two concentric, annular parts, to the detriment of its sealing effect.
  • the subject of the present invention is a screw cap of thermoplastics material, of the type specified above, which has the characteristic defined in the characterising part of
  • Figure 1 is a partial axial section of a cap according to the invention
  • Figure 2 is a diagram showing the arrangement of the projections of the cap shown in Figure 1,
  • Figure 3 shows a variant of the cap of Figure 1
  • Figure 4 shows a detail indicated by the arrow IV of Figure 3, at an intermediate stage of production and on an enlarged scale.
  • the cap shown in Figures 1 and 2 comprises a horizontal end wall 1 and a cylindrical skirt 2 with internal threading 3 whereby the cap can be screwedon to the externally-threaded neck A of a container.
  • the internal surface of the horizontal end wall 1 of the cap has an annular rib 4 at a certain distance from the cylindrical skirt 2.
  • the internal surface of the cylindrical skirt 2 of the cap has an annular radial rib 5 with a substantially .triangular cross-section. Together with the peripheral portion of the internal surface la, the two ribs 4 and 5 define an annular seat for housing a sealing washer 6 which is made from a plastisol which has been poured in and subsequently polymerised by heating.
  • the internal surface of the horizontal wall 1 of the cap has acircular row of projections 7 of equal height and spaced around a circle.
  • the projections 7 have downwardly-converging frusto-conical shapes; they could, however, also be in the shape of regular frusto-pyramids.
  • the height of the projections is of the order of 0.3 mm and the diameter of the end face of each projection is between 1/2 and 1/3 of the thickness of the wall of the container neck A. Normally this diameter is between 1 and 1.5 mm.
  • each projection 7 is provided and the central axis of symmetry X of each projection 7 intersects the central line of symmetry Y of the end face B of the container neck A.
  • the cap is shown when it has first been screwed on to a container by means of a screw-capping machine.
  • the end faces 7a of the projections 7 would form a stop against the end surface B of the neck A of the container, thus preventing the washer 6 from being split into two concentric annular parts as a result of contact between the surfaces la and B.
  • the projections 7 act as punches on the washer 6 and form a small hole therein in correspondence with each projection; however, since the diameters of the projections 7 are less than the thickness of the neck A of the bottle, the continuity of the washer 6 is not broken and the sealing effect is ensured even in this event.
  • the cap is made from a very rigid thermoplastics material, such as polypropylene filled with mineral fibres and having a hardness greater than 75 Shore D.
  • the cap shown has an opening tear-strip 8 interposed between the cylindrical skirt 2 and a lower ring 9 which has an internal annular rib 10 which snap engages beneath a corresponding rib on the neck of the container as a result of the first screwing-on of the cap, as described in detail in the European application mentioned above.
  • caps of this type in addition to the problem of preventing the washer from being cut during the first screwing-on, there is also the problem of preventing it from being released accidentally from its seat during the processing of the product.
  • the cap shown in Figure 3 has an additional annular rib 11 which projects from the periphery of the internal surface la of the horizontal end wall 1 so as partially to enter the seat for the washer 6.
  • the rib 11 extends adjacent the top of the cylindrical skirt 2 and projects towards the tip of the annular rib 5 which projects radially from the top of the cylindrical skirt 2.
  • the cross-section of the rib 11 is tapered from its base towards its free end and the diameter D 1 of the circumference defined by the tip of the rib 11 is approximately 1mm longer than the diameter D_ of the circumference defined by the tip of the annular rib 5.
  • the rib 11 is incorporated in the washer and therefore helps to prevent the washer from becoming disengaged from its seat subsequently.
  • a further characteristic which tends to prevent the accidental release of the washer 6 from its seat lies in the fact that the inner periphery of the seat 12 is defined by an annular rib 13 which has a thinner end portion 14 which projects horizontally towards the seat so as to form an engagement lip for the washer.
  • the vertical section of the rib 12 has a root portion 13 with inclined, downwardly-converging sides.
  • the outer side (that is that which faces the seat) is shorter than the inner side and is more inclined to a vertical axis.
  • the sealing ring also has an end portion 14a with an outer vertical side and a slightly- inclined inner side.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Closures For Containers (AREA)

Abstract

Le couvercle à vis décrit, qui est en matériau thermoplastique, est pourvu d'un siège placé à proximité adjacente de la périphérie de la surface interne de sa paroi d'extrémité horizontale (1a), de façon à loger une rondelle d'étanchéité (6) fabriquée à partir d'un plastisol, lequel est coulé et polymérisé par chauffage. Pour éviter que la rondelle (6) soit endommagée, au détriment de sa fonction d'étanchéité, lors de la première opération de vissage par machine du couvercle sur le col fileté (A) d'un récipient, à la suite d'un serrage excessif du couvercle dû à un réglage incorrect de la machine à visser les couvercles, les surfaces intérieures de la paroi d'extrémité horizontale (1a) du couvercle sont munies de plusieurs saillies circulairement espacées (7), qui coopèrent avec la surface d'extrémité (B) du col (A) du récipient, afin d'éviter que la rondelle (6) soit coupée. Dans le cas de couvercles utilisés pour la fermeture de récipients pour produits alimentaires devant être pasteurisés, l'ancrage de la rondelle (6) dans son siège est amélioré grâce à une nervure annulaire axiale supplémentaire (11), qui pénètre partiellement dans la rondelle (6), et grâce à une nervure annulaire (12) qui définit la périphérie interne du siège et qui présente une lèvre (14), laquelle est repliée horizontalement en direction du siège.
PCT/EP1990/000485 1989-03-29 1990-03-27 Couvercle a vis en materiau thermoplastique WO1990011232A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT67217A/89 1989-03-29
IT8967217A IT1232058B (it) 1989-03-29 1989-03-29 Capsula a vite di materiale termoplastico

Publications (1)

Publication Number Publication Date
WO1990011232A1 true WO1990011232A1 (fr) 1990-10-04

Family

ID=11300577

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP1990/000485 WO1990011232A1 (fr) 1989-03-29 1990-03-27 Couvercle a vis en materiau thermoplastique

Country Status (3)

Country Link
AU (1) AU5337290A (fr)
IT (1) IT1232058B (fr)
WO (1) WO1990011232A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2686065A1 (fr) * 1992-01-14 1993-07-16 Sincoplas Dispositif d'obturation de flacon avec joint d'etancheite.
DE102010028522A1 (de) 2010-05-04 2011-11-10 Robert Bosch Gmbh Schraubverschluss für Weichverpackungen
FR3128697A3 (fr) * 2021-10-28 2023-05-05 Massilly Holding Capsule pour fermer un corps d’emballage par vissage

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH464721A (de) * 1966-10-26 1968-10-31 Ciba Geigy Behälterverschlusskappe mit Innendichtung
FR2334579A1 (fr) * 1975-12-11 1977-07-08 Valves & Produits Industriels Bouchon creux a visser muni d'un joint d'etancheite
EP0095326A2 (fr) * 1982-05-20 1983-11-30 National Plastics Limited Fermeture pour récipients
EP0155021A1 (fr) * 1984-02-09 1985-09-18 Kornelis' Kunsthars Producten Industrie B.V. Capsule de bouchage en polypropylène pourvue d'un joint et d'une bande de garantie
US4570811A (en) * 1985-01-30 1986-02-18 Continental White Cap, Inc. Plastic closure with flowed-in plastisol lining

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH464721A (de) * 1966-10-26 1968-10-31 Ciba Geigy Behälterverschlusskappe mit Innendichtung
FR2334579A1 (fr) * 1975-12-11 1977-07-08 Valves & Produits Industriels Bouchon creux a visser muni d'un joint d'etancheite
EP0095326A2 (fr) * 1982-05-20 1983-11-30 National Plastics Limited Fermeture pour récipients
EP0155021A1 (fr) * 1984-02-09 1985-09-18 Kornelis' Kunsthars Producten Industrie B.V. Capsule de bouchage en polypropylène pourvue d'un joint et d'une bande de garantie
US4570811A (en) * 1985-01-30 1986-02-18 Continental White Cap, Inc. Plastic closure with flowed-in plastisol lining

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2686065A1 (fr) * 1992-01-14 1993-07-16 Sincoplas Dispositif d'obturation de flacon avec joint d'etancheite.
EP0552086A1 (fr) * 1992-01-14 1993-07-21 Societe Industrielle Et Commerciale De Matieres Plastiques - Sincoplas Dispositif d'obturation de flacon avec joint d'étanchéité annulaire
DE102010028522A1 (de) 2010-05-04 2011-11-10 Robert Bosch Gmbh Schraubverschluss für Weichverpackungen
WO2011138062A1 (fr) 2010-05-04 2011-11-10 Robert Bosch Gmbh Fermeture filetée pour emballages souples
FR3128697A3 (fr) * 2021-10-28 2023-05-05 Massilly Holding Capsule pour fermer un corps d’emballage par vissage

Also Published As

Publication number Publication date
AU5337290A (en) 1990-10-22
IT1232058B (it) 1992-01-23
IT8967217A0 (it) 1989-03-29

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