EP0154603B1 - Verschlusskappe aus Kunststoffmaterial - Google Patents

Verschlusskappe aus Kunststoffmaterial Download PDF

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Publication number
EP0154603B1
EP0154603B1 EP85810016A EP85810016A EP0154603B1 EP 0154603 B1 EP0154603 B1 EP 0154603B1 EP 85810016 A EP85810016 A EP 85810016A EP 85810016 A EP85810016 A EP 85810016A EP 0154603 B1 EP0154603 B1 EP 0154603B1
Authority
EP
European Patent Office
Prior art keywords
closure cap
cap according
bead
holding projections
holding
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
Application number
EP85810016A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0154603A1 (de
Inventor
Albert Obrist
Franz-Thomas Bartl
Klaus Geisinger
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Obrist Closures Switzerland GmbH
Original Assignee
Crown Obrist GmbH
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 Crown Obrist GmbH filed Critical Crown Obrist GmbH
Priority to AT85810016T priority Critical patent/ATE31280T1/de
Publication of EP0154603A1 publication Critical patent/EP0154603A1/de
Application granted granted Critical
Publication of EP0154603B1 publication Critical patent/EP0154603B1/de
Expired legal-status Critical Current

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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
    • 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
    • B65D41/3442—Threaded or like caps or cap-like covers provided with tamper elements formed in, or attached to, the closure skirt with rigid bead or projections formed on the tamper element and coacting with bead or projections on the container
    • B65D41/3447—Threaded or like caps or cap-like covers provided with tamper elements formed in, or attached to, the closure skirt with rigid bead or projections formed on the tamper element and coacting with bead or projections on the container the tamper element being integrally connected to the closure by means of bridges
    • 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
    • B65D2401/00—Tamper-indicating means
    • B65D2401/15—Tearable part of the closure
    • B65D2401/30—Tamper-ring remaining connected to closure after initial removal
    • 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
    • B65D2401/00—Tamper-indicating means
    • B65D2401/15—Tearable part of the closure
    • B65D2401/35—Vertical or axial lines of weakness

Definitions

  • the invention relates to a closure cap made of plastic material according to the preamble of claim 1.
  • closure caps with a so-called mechanical guarantee band have been known and used for some time.
  • the mechanical guarantee bands have the advantage that they snap into place automatically when the screw cap is screwed on and that no additional processing stations such as e.g. Heat shrink tunnels, etc. are required. After the retaining elements have snapped in when the cap is completely screwed on, the cap can only be unscrewed by destroying the guarantee band, so that the first opening of a container is indicated.
  • the mechanical guarantee tapes have difficulties on the one hand due to the somewhat complicated cross-sectional configuration when demolding from the injection molding tool. On the other hand, care must also be taken to ensure that the mechanical guarantee band is not destroyed when the closure cap is placed on the container mouth.
  • the mechanical guarantee band must therefore be able to stretch to a certain extent when screwing on, without this stretchability when the closure cap is unscrewed from causing the retaining elements to slide over the annular projection without tearing off the guarantee band.
  • a sealing cap with a mechanical guarantee band in which a bead which runs around the inside of the guarantee band and which is pulled slightly obliquely downwards on one side serves as a retaining element.
  • the circumferential bead has the disadvantage that it significantly thickens the wall thickness of the guarantee band, so that the guarantee band is overstretched at the critical point. This overstretching can result in the bead no longer engaging sufficiently deep under the ring-shaped projection, so that unscrewing the closure cap can be possible without tearing off the guarantee band.
  • a mechanical guarantee device is known from FR-A-2,454,977, in which the guarantee band consists of two approximately semicircular sections, on the inside of which a holding cam is arranged.
  • the two-part design of the guarantee band without any connection between the two sections is intended to ensure a certain flexibility.
  • the complete interruption of the guarantee band harbors the risk that the guarantee band will not tear off when the screw cap is removed, but will only be bent slightly outwards.
  • Another object of the invention is to provide a cross-sectional configuration which is optimal in terms of injection molding and which can be removed from the mold with rapidly working, axially demolding casting tools.
  • a further task is to create a mechanical guarantee band which at least partially tears off the lower edge of the cap even with a low unscrewing torque.
  • this task is solved “starting from the closure cap according to FR-A-2 454 977” with a closure cap which has the features in the characterizing part of patent claim 1.
  • the combination of a total of three different retention elements optimally takes into account the different, sometimes contradicting, requirements for the guarantee band.
  • the circumferential locking edge practically hardly affects the elasticity of the guarantee band. Nevertheless, it engages under the circumferential projection at the container mouth over its entire circumference and thus already acts as an abutment when the cap is unscrewed.
  • the individual retaining cams in the area of the locking edge also do not impair the elasticity of the guarantee band.
  • the number and arrangement of the holding cams can also be used to control the tear-off process on the guarantee band.
  • the bead acts as the third retaining element, the dimensioning of which allows the elasticity of the guarantee band to be influenced.
  • the bead forms a whole or partial reinforcement of the wall thickness of the guarantee band.
  • the three retaining elements work together in a particularly optimal manner if the radial thickness of the bead on both sides of the retaining cams decreases with increasing distance from the latter in the circumferential direction.
  • the bead supports the holding cam, without the bead causing excessive stiffening in relation to the entire circumference.
  • the guarantee band remains elastic and is not overstretched when the screw cap is put on.
  • At least two retaining cams are particularly advantageously arranged on the guarantee band, the bead between the retaining cams merging into the latching edge.
  • the guarantee band is divided into elastic zones where the bead merges with the latching edge, while the guarantee band increasingly stiffens towards the retaining cams.
  • the bead expediently has an approximately triangular configuration in cross section, the upper boundary surface of the bead facing the cap bottom merging seamlessly into the latching edge. With this shape, which is also advantageous in terms of injection molding. the bead can be easily pushed over the bottle bead.
  • the tear-off process on the guarantee tape runs in a particularly optimal manner if the guarantee tape has a vertical predetermined breaking point, and if In the area of the vertical predetermined breaking point, a vertical connecting web is arranged, via which the tamper-evident band remains connected to the closure cap after tearing off, wherein at least one retaining cam can be arranged in a sector approximately opposite the vertical predetermined breaking point.
  • the guarantee tape first tears in the sector opposite the vertical predetermined breaking point. In this way, the unscrewing torque remains relatively low, since the guarantee band does not have to be torn off over the entire circumference at the same time.
  • the vertical predetermined breaking point on the guarantee band also tears open, so that the guarantee band is only connected to the cap via the vertical connecting web. This ensures that the guarantee band does not remain on the container mouth, which is particularly important for reusable bottles.
  • the connecting web is arranged in front of the vertical predetermined breaking point in the unscrewing direction, the opening of the predetermined breaking point is promoted.
  • the reinforced connecting web practically does not bend, so that the predetermined breaking point does not bend or stretch when unscrewed, but tears immediately when the required force is reached.
  • connection of the guarantee tape to the closure cap is ensured.
  • the second web prevents the connecting web from breaking off when the unscrewing torque is jerky. Both the connecting web and the second web can, however, be torn off by hand after tearing off the guarantee band or after tearing the vertical predetermined breaking point by pulling on the guarantee band.
  • the tearing process at the vertical predetermined breaking point can be further influenced by the fact that it has several predetermined tearing webs running approximately parallel and at right angles to the central axis. Since the vertical predetermined breaking point is often torn open by slightly tilting the sealing cap, the parallel predetermined tear bars facilitate this process. Overstretching of the predetermined tear webs can be prevented if they have a cross-sectional configuration that tapers towards one side. In this way, all webs tear on the same side.
  • the tapering cross-sectional configuration also has advantages in terms of injection molding, since the flow behavior of the thermoplastic casting composition is promoted during injection.
  • the holding cams facing the cap bottom is inclined at an angle of between 75 and 85 degrees relative to the central axis, the holding cams can be demolded in the simplest way in an axially opening casting tool without their function as an abutment being impaired. If the underside of the retaining cams facing away from the cap bottom is inclined at an angle of between 15 and 30 degrees relative to the central axis, this results in a gentle stretching of the guarantee band while it is pushed over the projection.
  • a closure cap 1 has an internal thread 2 in order to be screwed onto the external thread 4 of a container mouth 3.
  • the container mouths are usually standardized bottle mouths such as in Europe the MCA standard for soft drinks bottles (Bachem Carl-Jakob, the new dressing bottles with external screw thread, in “The Soft Drink / Mineral Water Newspaper”, Stuttgart, No. 4 from January 28, 1970).
  • the exemplary embodiments described below relate to closure caps for bottle mouths according to the MCA standard.
  • the closure cap 1 can have an inner seal 24 or else another sealing system.
  • the guarantee tape 6 is fastened with tear-off webs 17.
  • tear-off webs 17 can be arranged over the entire circumference.
  • the number of tear-off webs can, however, also be changed, the total cross-sectional area of all tear-off webs having to be taken into account for the function.
  • the tear-off webs can be provided on the lower edge 5 with facets 18, which are advantageous in terms of injection molding. The facets also reinforce the tear-off webs for the axial demolding of the casting tools and for the first screwing on of the sealing cap.
  • the cross-section of the guarantee band itself is divided into an upper part 25 and a lower part 21.
  • the upper part 25 has approximately the same inner diameter as the closure cap at its lower edge 5.
  • the edge of the guarantee band facing the lower edge 5 of the closure band is formed approximately wedge-shaped, whereby the demolding is facilitated.
  • a circumferential shoulder 23 on the outside of the guarantee band ensures in a manner known per se that the guarantee band is supported during the axial demolding of the tools.
  • the locking edge 9 is formed by reducing the diameter of the guarantee band.
  • the inside Diameter of the inner wall 7 is smaller than the outer diameter of the circumferential projection 8 at the container mouth 3.
  • the locking edge or the entire lower guarantee band 21 must therefore be stretched over the bead 8 when the cap is first screwed on. For this reason, the inner diameter of the inner wall is only slightly smaller than the outer diameter of the projection to form a locking edge.
  • the inner wall of the upper part 25 of the guarantee band merges with the locking edge 19 into the locking edge 9.
  • the snap radius is about 0 to 1.0 mm. Larger radii impair the function of the locking edge and smaller radii can cause problems when demolding.
  • the latching edge is additionally reinforced with a circumferential bead 26 directed towards the center.
  • the lower part 21 of the guarantee band is approximately hollow cylindrical in the present exemplary embodiment.
  • the outer diameter of the lower part 21 corresponds approximately to the inner diameter of the upper part 25.
  • the wall thickness of the lower part 21 essentially determines the spring or. Stretching behavior when screwing on the cap.
  • the wall thickness selected in the exemplary embodiment is approximately 0.4 to 0.5 mm.
  • the inside 7 of the guarantee band has a conical widening 22 at the bottom. When the screw cap is screwed on, this widening serves to center the guarantee band on the container mouth.
  • the angle of the conical expansion is between 15 and 30 degrees relative to the central axis.
  • Holding cams 10 are arranged on the inside 7 of the guarantee band approximately in the area of the plane of the latching edge 9. These retaining cams, together with the latching edge 9, cause the tension on the tear-off webs 17 to rise so much when the cap is unscrewed that they tear. At least one holding cam is required to achieve the advantages according to the invention. If the cams were omitted, the latching edge 9 or the bulge 26 would have to be dimensioned such that either demolding would no longer be possible or that the guarantee band would overstretch when screwed on. However, several holding cams can also be arranged regularly or irregularly over the scope of the guarantee band. It is also conceivable to arrange the holding cams slightly offset in the axial direction.
  • the top 15 of the holding cams 10 and the bead 26 advantageously merges directly into the latching edge 9.
  • the angle between the top 15 and the central axis is advantageously between 75 and 85 degrees. An angle of around 90 degrees would be optimal in itself, but the guarantee band would then be difficult to demold.
  • the underside 16 of the holding cams 10 advantageously merges directly into the conical widening 22 and also has the same angle as this widening.
  • FIG. 2, 3 and 4 show a slightly modified embodiment with a vertical predetermined breaking point 11 in the guarantee band.
  • the cross-sectional configuration of the guarantee band is approximately the same as in the exemplary embodiment according to FIG. 1.
  • a harder or softer tearing off of the guarantee band can be achieved.
  • FIG. 4 shows a further modified variant, in which the radial thickness of the bead 26 decreases with increasing distance from the holding cams 10.
  • a connecting web 12 is arranged, on which the guarantee tape remains connected to the end cap after it has been torn off.
  • Another web 13 of smaller cross-section is arranged next to the connecting web 12 and serves to reinforce the connection between the guarantee band and the sealing cap.
  • FIG. 3 shows the arrangement and configuration of the holding cams 10.
  • the holding cams 10 have a segment-like base area and at least one is arranged in a sector approximately opposite the vertical predetermined breaking point 11.
  • the vertical predetermined breaking point 11 is arranged on a circumferential section, the length of which between the two holding cams 10 'and 10 "is greater than the length of the sections between these holding cams and the third holding cams 10.
  • This arrangement of the holding cams makes it particularly advantageous to tear off the individual tear-off webs First the tear-off webs 17 ', which are approximately opposite the predetermined breaking point 11 or the connecting web 12, tear.
  • the bead 26 merges between the retaining cams 10, 10 'and 10 "in the latching edge 9 or in the inner wall 7 of the guarantee band, so that zones X with increased elasticity in the circumferential direction arise at these points.
  • the holding cams 10 can, however, also be distributed in other ways over the scope of the guarantee band. So it is e.g. conceivable to arrange several, for example five, holding cams in the unscrewing direction behind the vertical predetermined breaking point 11 over a section of approximately 180 degrees.
  • the holding cams 10 can be distributed uniformly over the circumference, as shown in FIG. 5.
  • the design for single-use bottles also lacks the vertical predetermined breaking point 11 as well as the webs 12 and 13.
  • the guarantee tape remains on the mouth of the container when the cap is unscrewed, where it does not interfere any further.
  • the decreasing thickness of the bead 26 is particularly clearly visible here.
  • the bead is reduced approximately evenly and merges approximately in the middle between two holding cams 10 into the latching edge.
  • the radial thickness of the bead 26 runs differently than shown.
  • the bulge 26 could initially have approximately a uniform radial thickness, only then to taper at a distance from the holding cams 10.
  • Zones X with increased elasticity or with a missing or greatly reduced bead could also be formed to be more or less long.
  • FIGS. 6 and 7 show a vertical predetermined breaking point 11 in a greatly enlarged representation, the predetermined breaking point having predetermined parallel tear webs 14.
  • the predetermined tear webs 14 have a cross section that tapers approximately conically on one side. This ensures that all of the predetermined tear webs 14 on the smallest cross section tear on one side. This prevents overstretching.
  • FIGS. 8 and 9 show, however, other configurations of the vertical predetermined breaking point are also conceivable. For example, a thin film with a thickening at the lower edge according to FIG. 8 or a thin, approximately wedge-shaped film according to FIG. 9.
  • FIG. 10 shows, greatly simplified, a modified exemplary embodiment with only a single holding cam 10 and with a bead 26, the radial strength of which tapers evenly up to the point X approximately opposite the holding cam 10.
  • the caps are usually made of polyethylene or polypropylene.
  • the closure caps according to the invention can be placed onto the container mouths using conventional attachment devices, which represents a further advantage.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Closures For Containers (AREA)
EP85810016A 1984-02-06 1985-01-22 Verschlusskappe aus Kunststoffmaterial Expired EP0154603B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT85810016T ATE31280T1 (de) 1984-02-06 1985-01-22 Verschlusskappe aus kunststoffmaterial.

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
CH531/84 1984-02-06
CH53184 1984-02-06
CH2327/84 1984-05-11
CH232784 1984-05-11

Publications (2)

Publication Number Publication Date
EP0154603A1 EP0154603A1 (de) 1985-09-11
EP0154603B1 true EP0154603B1 (de) 1987-12-09

Family

ID=25684868

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85810016A Expired EP0154603B1 (de) 1984-02-06 1985-01-22 Verschlusskappe aus Kunststoffmaterial

Country Status (13)

Country Link
US (1) US4664279A (ja)
EP (1) EP0154603B1 (ja)
JP (1) JPS61501386A (ja)
AU (1) AU567458B2 (ja)
CA (1) CA1264156A (ja)
DE (1) DE3561144D1 (ja)
DK (1) DK157804C (ja)
ES (2) ES284374Y (ja)
FI (1) FI83500C (ja)
GR (1) GR850153B (ja)
IE (1) IE56297B1 (ja)
IL (1) IL74248A (ja)
WO (1) WO1985003492A1 (ja)

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DE19613364C1 (de) * 1996-04-03 1997-11-20 Weis Kg Schraubverschlußkappe aus Kunststoff und Verfahren zu deren Herstellung

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19613364C1 (de) * 1996-04-03 1997-11-20 Weis Kg Schraubverschlußkappe aus Kunststoff und Verfahren zu deren Herstellung

Also Published As

Publication number Publication date
IE56297B1 (en) 1991-06-05
FI83500C (fi) 1991-07-25
AU567458B2 (en) 1987-11-19
IL74248A (en) 1988-11-30
IE850270L (en) 1985-08-06
ES287751U (es) 1988-06-16
IL74248A0 (en) 1985-05-31
DK157804B (da) 1990-02-19
FI853864L (fi) 1985-10-04
ES284374U (es) 1986-03-01
EP0154603A1 (de) 1985-09-11
FI853864A0 (fi) 1985-10-04
ES287751Y (es) 1990-04-16
CA1264156C (en) 1990-01-02
DK447385A (da) 1985-10-02
FI83500B (fi) 1991-04-15
CA1264156A (en) 1990-01-02
AU3837885A (en) 1985-08-27
DK447385D0 (da) 1985-10-02
ES284374Y (es) 1988-03-01
JPS61501386A (ja) 1986-07-10
DK157804C (da) 1990-09-24
WO1985003492A1 (en) 1985-08-15
US4664279A (en) 1987-05-12
DE3561144D1 (en) 1988-01-21
GR850153B (ja) 1985-03-29

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