EP3817990B1 - Bouchon fileté doté d'un joint d'étanchéité réglé - Google Patents

Bouchon fileté doté d'un joint d'étanchéité réglé Download PDF

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Publication number
EP3817990B1
EP3817990B1 EP19736350.0A EP19736350A EP3817990B1 EP 3817990 B1 EP3817990 B1 EP 3817990B1 EP 19736350 A EP19736350 A EP 19736350A EP 3817990 B1 EP3817990 B1 EP 3817990B1
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EP
European Patent Office
Prior art keywords
outer seal
seal
container
screw closure
head plate
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.)
Active
Application number
EP19736350.0A
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German (de)
English (en)
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EP3817990A1 (fr
EP3817990C0 (fr
Inventor
Günter Krautkrämer
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.)
Bericap GmbH and Co KG
Original Assignee
Bericap GmbH and Co KG
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Publication of EP3817990A1 publication Critical patent/EP3817990A1/fr
Application granted granted Critical
Publication of EP3817990C0 publication Critical patent/EP3817990C0/fr
Publication of EP3817990B1 publication Critical patent/EP3817990B1/fr
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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
    • B65D51/00—Closures not otherwise provided for
    • B65D51/16—Closures not otherwise provided for with means for venting air or gas
    • B65D51/1633—Closures not otherwise provided for with means for venting air or gas whereby venting occurs by automatic opening of the closure, container or other element
    • B65D51/1661—Closures not otherwise provided for with means for venting air or gas whereby venting occurs by automatic opening of the closure, container or other element by means of a passage for the escape of gas between the closure and the lip of the container mouth
    • 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
    • B65D39/08—Threaded or like closure members secured by rotation; Bushes therefor
    • 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
    • B65D2251/00—Details relating to container closures
    • B65D2251/20—Sealing means

Definitions

  • the present invention relates to a plastic closure for positive and tight placement on the neck of a liquid container with a head plate provided for covering a container opening and an outer seal which runs approximately parallel to the edge of the head plate and which is intended for engagement with the outside of a container neck defining the container opening is, as well as an inner seal within the outer seal and running parallel to it, which is intended for engagement with the inside of the container neck, the outer and inner seals each protruding from the inside of the head plate in the direction of the container neck.
  • circumferential seals extend parallel to one another and approximately perpendicular or slightly inclined to the plane defined by the head plate.
  • the invention relates to a screw cap made of plastic for liquid containers, wherein the screw cap has a head plate, a cylindrical cap jacket with an internal thread that defines an axis of the closure, and an annular inner seal to be brought into engagement with the cylindrical inner surface of the container neck after it has been applied to the container neck, as well has an annular outer seal to be brought into engagement with the cylindrical outside of a container neck, the outer and inner seals each extending in a predominantly axial direction from the inside of the head plate.
  • a closure according to the preamble of claim 1 is known with an outer seal and a stopper seal in the form of a ring to enable venting of excess pressure within the container.
  • Such plastic closures are used, among other things, for beverage bottles.
  • the present invention relates in particular to closures for containers in which uncontrolled excess pressure can arise. This applies, for example, to containers that are filled with a liquid that can in principle be fermented and within which considerable excess pressure can therefore build up (after contamination with germs).
  • Such containers when filled with the products in question, generally do not have a high internal pressure, with the exception of a small excess pressure deliberately applied by filling with an inert gas, which essentially serves to keep the bottles, which are mostly made of thin-walled PET material, overall stable and therefore stackable, with several containers typically being combined into a container and stacked on top of each other in this form.
  • the closure according to the invention has, as is common in the prior art, two independent seals, one of which comes into sealing contact with the inside and the other with the outside of a corresponding container neck. (deleted text moved to page 3:)
  • the closures used for this are generally relatively short axially and also have a relatively steep, usually multi-start thread, which allows the container to be opened and closed quickly , on the other hand, the closure only offers a comparatively small hold, and also only allows limited ventilation or venting of the container during the short opening process.
  • the invention is of course not limited to this specific application, but rather relates to closures for all containers in which an overpressure of e.g. B is more than 4 bar, especially if such an overpressure can arise in an uncontrolled manner.
  • the inner seal only withstands a limited excess pressure.
  • the outer seal can withstand a very significant excess pressure.
  • the present invention is based on the object of creating a closure and also a container with a closure, which generally avoid the closure blowing off under high overpressure.
  • the outer seal has a weakened area in at least one circumferential section, the closure being designed such that the outer seal in the weakened area gives way at a lower internal excess pressure than without the weakened area, in particular in the weakened area, gives way earlier than in the other areas.
  • the weakening area preferably extends over an angular sector measured with respect to the axis, which, depending on the type of weakening, can be limited to less than 1° circumferential angle, but in other embodiments also to an angular sector of 20 to 90°.
  • the weakened area could also extend over the entire circumference, for example in the form of a spirally circumferential groove.
  • the task is solved in that the closure does not allow a correspondingly high overpressure to arise from the outset, i.e. it becomes leaky and allows gas to escape when the pressure inside the container exceeds a certain, predeterminable level, without any additional pressure Pressure relief valve to be installed.
  • the lower section of the inner seal (facing away from the head plate) is typically beveled radially inwards and curved inwards at the end in order to ensure that the inner seal slides into the opening of the container neck when the closure is placed on the container neck.
  • the lower end of the inner seal therefore has when the external bead is on the The inside of the container neck rests a clear clear distance from this inside.
  • the inner seal has a radially outwardly projecting area or bead on its outside, which, after appropriate compression by the container neck, lies in a sealing manner against the inside of the container neck under elastic prestress.
  • An overpressure that arises in a container equipped with a closure usually causes the top plate of the closure to bulge.
  • the inner seal is moved a little way up to the free opening of the neck, and at the same time the inner seal tilts radially inwards and the pressure of the gas or liquid, which can act from the outside on the lower section of the inner seal, also contributes to a radially inwards Pivoting the inner seal so that it lifts off at least locally from the inside of the container neck from a certain excess pressure.
  • the inner seal will therefore leak.
  • the internal pressure then acts on the external seal.
  • the bulging of the head plate also causes a reduction in the diameter of the outer seal, at least at its base on the head plate, which leads to an even firmer pressing of the outer seal on the container neck. Without measures to reduce the internal pressure, there is then the risk described above of sudden explosion when the closure is opened.
  • the outer seal due to the weakening area of the outer seal specifically provided according to the invention, the outer seal also yields at a lower pressure than would be the case if the outer seal had no weakening area at all. This reduces the otherwise higher internal pressure and the risk of a closure breaking off from the container neck is completely or at least largely eliminated.
  • the weakening area is therefore a means of specifically limiting overpressure.
  • the desired overpressure value at which the weakened area of the outer seal gives way and allows the gas under pressure in the container to escape can be easily adjusted.
  • the weakened area will be adjusted so that the pressure at which the outer seal opens in the weakened area is slightly above the excess pressure with which the container is filled anyway for reasons of stability, ie with a pressure between 1 and 2.5 bar , whereby exact adherence to certain pressure values is not important, as long as the opening pressure of the weakened area is well below the values that could cause the closure to dangerously blow off the neck of the container.
  • a sensible upper limit for the internal pressure of containers intended, for example, for non-carbonated containers is around 3 - 4 bar for a closure with a two-start thread with an approx. 360° wrap angle and a nominal diameter of 38 mm.
  • Such a reasonable upper limit for the pressure varies with the diameter of the neck and the design of the thread. and can tend to be larger with a smaller diameter and smaller with a larger diameter.
  • the outer seal of the screw cap according to the invention expediently has an area referred to below as the sealing area, which is generally regarded as the axial area which comes into sealing contact with a container neck.
  • the sealing area is generally regarded as the axial area which comes into sealing contact with a container neck.
  • this is an area of the outer seal with a constant inner diameter that at least partially encompasses the middle third of the axial length of the outer seal.
  • the end of the outer seal which is remote from the head plate and has the shape of a ring or annular web, is (seen in an axial section) generally slightly curved or beveled radially outwards, also to ensure that it slides onto the container neck when the closure is placed on the container neck
  • the outer seal being radially expanded and stretched overall so that it rests against the container neck under elastic prestress and in this way withstands a relatively high internal pressure.
  • the sealing area of an outer seal comprises at least a part of the central axial third of the outer seal, and the sealing area can then be defined accordingly with reference only to the closure.
  • the lower end section of the outer seal which is curved radially outwards, does not rest on the container neck and cannot contribute significantly to the sealing.
  • the actual sealing area of the outer seal is located approximately in the middle third, based on the axial length of the outer seal. This is the sealing area defined above, which according to the present invention should be influenced by targeted measures or set to a specific opening pressure.
  • the weakened area consists of a peripheral section of the outer seal, which has a reduced wall thickness compared to the rest of the outer seal, the outer seal in this weakened area having the same inner radius as the rest of the outer seal, but a smaller outer radius. Due to the constant inner diameter, such an outer seal rests along its entire circumference with the sealing area on the outer surface of a container neck Seals well within the required pressure range for which the container and closure are designed under normal conditions.
  • Such a configuration results in a closure that is completely tight under normal circumstances and is completely sealed by both an inner seal and an outer seal, with the head plate only bulging strongly in the event of a larger (e.g. > 4 bar) internal overpressure, thereby tilting the inner seal radially inwards and lifting it axially and/or radially from the inner surface of the container neck, whereupon the stronger pressure then acting on the outer seal is reduced via the respective weakened area.
  • a larger e.g. > 4 bar
  • the reduced wall thickness extends in the axial direction from a free axial (lower) end to the upper third of the outer seal, based on the axial length of the outer seal outside the weakened area.
  • the maximum outer diameter of the inner seal i.e. H. the so-called “bulge” of the outer seal
  • H. the so-called “bulge” of the outer seal is provided at an axial distance between only 0.4 and 1.2 mm, preferably less than 1 mm, from the stop surface, so that this area is protected from any movements of the head plate, in particular a bulging of the same, is very strongly influenced and therefore lifts off from the inner surface of the container neck at least after reaching a certain excess pressure and at least in places. Gas (or liquid) under excess pressure can then escape into the area in front of the outer seal, with the weakened area of the outer seal limiting the resulting pressure by allowing the pressurized gas to pass through when a limit pressure is exceeded.
  • the sealing bead of the inner seal which defines its maximum diameter, can be raised into the area of the rounding of the inner bottle neck edge or beyond, so that the inner seal definitely allows gas towards or into the outer seal The area between the outer and inner seals can pass through.
  • the weakening area consists of a peripheral section of the outer seal that is axially shortened in the angular sector ⁇ . Because the outer seal is shortened in a circumferential section and the shortening also covers the sealing area, there is only an axially very short section of the sealing area in the angle sector Outside of the container neck, which means that the outer seal in this weakened area, simply because it is also raised a little axially by the bulging head plate, gives way at a relatively low excess pressure in the inside of the container and locally from the bottle neck lifts off so that any excess pressure is reduced.
  • such an axially shortened sealing area is still sufficient to ensure a seal of the screw cap in the unpressurized state, ie when the pressure on both sides of the outer seal is approximately the same or limited to the regular excess pressure ( ⁇ 2 bar) of the container.
  • the axial length of the outer seal in the weakened area is less than two thirds of the axial length of the outer seal outside the weakened area.
  • This measure also causes the outer seal and thus the closure as a whole to leak at a significantly lower internal pressure or to reduce the increased internal pressure sooner.
  • a closure with an external seal without the weakening area Without weakening, as provided according to the present invention, the outer seal remains tight until a PET bottle bursts.
  • the axial shortening can be approximately one third compared to the outer seal in the remaining area and the wall thickness should be less than half of the wall thickness of the outer seal outside the weakened area be, with the reduced wall thickness extending axially into the upper third of the outer seal, based on its axial length outside the weakening area.
  • a groove or a rib runs on the inner surface of the outer seal, which in any case extends over the axial width of the sealing area of the outer seal.
  • a corresponding groove would provide a small channel bridging the sealing area, via which overpressured gas inside the container, which may have already passed the inner seal, can be discharged to the outside without the pressure inside the container increasing further .
  • a web or a rib which protrudes radially inwards on the surface of the outer seal and otherwise also extends across the axial width of the sealing area, acts in a similar way, since on both sides of such a rib the sealing surface of the outer seal is separated from the Bottle neck is lifted, and in this way also forms a passage for gas under excess pressure.
  • these embodiments have an outer seal that permanently exhibits a specifically adjusted, small leak.
  • This leak can be caused by a capillary-like passage of e.g. B. 0.03 mm 2 cross section allows sufficient gas to pass through, such as is released during a fermentation process.
  • a capillary-like passage e.g. B. 0.03 mm 2 cross section allows sufficient gas to pass through, such as is released during a fermentation process.
  • this passage may also have to allow liquid to pass through.
  • such a capillary opening does not pose a problem under normal sales and storage conditions because under such conditions the inner seal still effectively seals the container interior from the environment.
  • a corresponding groove and, analogously, a corresponding rib should have the smallest possible cross-section that meets the above conditions and which is, for example, less than 0.05 mm 2 , in particular less than 0.02 mm 2 , with a corresponding groove and, analogously, one Corresponding rib could, for example, have a width and also a depth of 0.1 mm each, so that the total cross section does not exceed 0.01 mm 2 .
  • the passage cross section at least for gas, can also be significantly below the aforementioned values and, for example, only be 0.0001 mm 2 , which is sufficient to reduce slowly building gas pressure, but on the other hand to prevent the penetration of contaminants and germs as long as no reverse pressure difference occurs , faces great resistance.
  • the inner seal definitely prevents pathogens and the like from entering the container and the risk that only the container neck mouth may become contaminated is in the embodiments described above with a groove or Rib on the inner surface of the outer seal is very small given the small cross section of the groove or rib.
  • the inner seal has an axial length of at least 2 mm with an end section that tapers conically from its maximum diameter to its axial front one end also contributes to easier removal of the inner seal from the inner surface of the container neck.
  • the gas under pressure in a container has no axial counterpart in the conical area outside the inner cross section of the inner seal and can therefore contribute to the inner seal being pushed radially inwards and thereby becoming leaky
  • the maximum outside diameter of the inner seal is also smaller than the minimum inside diameter of the outer seal because a container neck mouth has to be accommodated between them, with the corresponding ramp slopes and roundings on the seals and/or at the container neck mouth making it possible for the maximum outside diameter of the inner seal and the minimum diameter of the outer seal differs only slightly, and in particular significantly less, than corresponds to the wall thickness of the container neck.
  • the head plate has an annular section between the outer and inner seals, which defines an axial stop surface for the end face of a container neck mouth.
  • the wall thickness in the area of this annular stop surface can be the same as in the central area of the head plate, but in particular it can also be larger or smaller, the latter being preferred in order to make the head plate easier to move so that it moves more in the event of excess pressure inside the container bulges.
  • the invention also relates to a container with a plastic closure, the container having a container neck which is designed for positive and tight engagement with a plastic closure according to one of claims 1 to 13.
  • the invention also relates to a container which has a container neck with an external thread and a screw cap, the maximum external radius of the internal seal being 0.2 to 0.4 mm larger than the nominal internal diameter of the bottle neck.
  • the inner diameter of the outer seal which is constant in the sealing area, is also 0.2 to 0.4 mm smaller than the nominal outer diameter of the container neck. This ensures that both seals rest under pretension on the inside or outside of the container neck, while the end face abuts axially on the annular stop surface of the head plate, which lies between the outer seal and the inner seal.
  • Figure 1 shows an axial section through the edge of a container neck with attached closure 100.
  • the container neck is described below as a bottle neck. and shows the contour of a bottle neck edge of a PET bottle with a 30 or 43 mm thread.
  • the inner seal 5 is shown here overlapping the inner surface of the bottle neck 20, but this is only intended to indicate that the outer surface of the inner seal, in particular the bead 5 'provided on the outer surface, rests with elastic prestress on the inner surface of the bottle neck 20, as is the case in Figure 2 is shown, where Figure 2 additionally shows a head plate 1 that is bulged due to increased internal pressure.
  • the increased pressure also causes the conical outer surface between the maximum diameter of the bead 5 ' and the lower free end of the inner seal 5 to be acted upon by the increased internal pressure, so that from a certain internal pressure the inner seal 5 or its outwardly projecting bead from the Inner surface of the bottle neck 20 lifts off and thus allows the pressure to escape into the area between the outer seal 7 and inner seal 5.
  • the in Figure 2 The state shown corresponds to a situation in which the inner seal 5 is raised and tilted to such an extent that it is lifted off the inner surface 22 of the bottle neck and is leaking.
  • the rounding provided on the inner upper edge of the bottle neck in accordance with usual standards in turn contributes to the inner seal losing at least local sealing contact with the bottle neck above a certain pressure.
  • FIG. 1A a part of the closure 100, which has a head plate 1, a cap jacket 2 with a screw thread 3 and an inner seal 5 and an outer seal 7.
  • the mouth of the bottle neck 20 pushes between the outer seal 7 and the inner seal 5, generally until the end face 24 of the bottle neck mouth abuts a stop surface 4 of the annular section 14 on the underside the head plate 1, which is located between the two seals 5 and 7.
  • the conically inwardly tapering lower section of the inner seal 5 and the conically or rounded widening lower section of the outer seal 7, as well as the roundings on the upper edge of the bottle neck mouth, contribute to the fact that the bottle neck 20 is between when the closure 100 is put on the inner seal 5 and the outer seal 7 pushes and does not compress a seal that hits the end face 24 of the bottle neck.
  • Figure 2 shows (again only in a section) a head plate 1 that is bulged under increased internal pressure, so that the internal pressure triggers a leak in the inner seal 5, the clear distance between the bead 5 'of the inner seal 5 and the inside 22 of the bottle neck 20 to illustrate the occurring Effects are somewhat exaggerated.
  • the bulging of the head plate 1 which is also favored by a smaller wall thickness d of the head plate 1 in the area of the annular section 14 of the head plate 1 (see Figure 4 )
  • the inner seal 5 tends to tilt inwards, as initially happens due to the radially inward pushing of the bead 5 'when it engages with the inner sealing surface of the bottle neck 20.
  • the head plate 1 has a slightly larger wall thickness D, whereby the different wall thicknesses d, D are not a mandatory feature, but can promote or simplify the desired overpressure limitation of the closure.
  • a groove can be provided on the inside of the head plate 1 at the transition from the stop surface 4 and the inner seal 5, which makes the inner part of the head plate 1 with the inner seal 5 even more movable compared to the radially outer one Section 14 makes the bulging of the head plate 1 and the tilting and axial lifting of the inner seal 5 even easier until it leaks.
  • the bead 5 lifts off from the internal surface 22 of the bottle neck 20 at least in some places, so that the pressure escapes can until the curvature of the head plate 1 has reduced accordingly and the elastic restoring forces of the inner seal bring the bead 5 'of the inner seal 5 back into sealing engagement with the bottle neck.
  • Figure 3A shows the same closure as that Figure 1A , however, the cutting plane runs through a weakened area 6 of the outer seal 7.
  • the weakened area 6 consists of an optionally axially shortened section 6 of the outer seal 7 with reduced wall thickness, which although has the same inner diameter as the outer seal 7 in the rest of the area, but has a significantly smaller outer diameter.
  • Figure 3B shows a section through the line B3-B3 in Figure 3A .
  • the inner seal 5 rests on the inner surface 21 of the bottle neck 20 (the overlap of the inner seal 5 with the bottle neck 20 in Figure 3A is only intended to represent the stress-free state before the inner seal 5 or its bead 5 'is pressed inwards through the bottle neck).
  • the upper third of the outer seal 7, which adjoins the head plate, is located in the area of a radius of curvature at the upper edge of the neck opening and therefore does not come into contact with it
  • the bottle neck and the lower third are already radially expanded in order to make it easier for the mouth of the bottle neck 20 to slide into the space between the two seals 5 and 7 when the closure is placed on a bottle neck.
  • seal 7 is now shortened over a certain angular sector ⁇ , which can be 30°, for example, to half or the entire axial length of the outer seal 7, then in this area there is only an axially relatively short section of the outer seal 7 with the outside 21 of the bottle neck 20 in contact, with a relatively low excess pressure within the outer seal 7 being sufficient to lift this relatively short, still sealing section from the outside 21 of the bottle neck 20 and thus to relieve pressure.
  • ⁇ which can be 30°, for example, to half or the entire axial length of the outer seal 7
  • the angular section shown still recognizes two end sections, is not only axially shortened in the weakening segment within the angular sector ⁇ but is also replaced by a weakening area 6 with reduced wall thickness, which, however, has the same inner diameter as the inner seal 7.
  • the weakened area 6 of the outer seal Under normal conditions, ie when there is no or only a small overpressure of e.g. B. 2 bar prevails in the area between the inner seal 5 and outer seal 7, the weakened area 6 of the outer seal also lies sealingly against the outside 22 of the bottle neck 20 and protects against the ingress of germs before initial use, ie on the way from the bottler to the consumer .
  • Figure 4 illustrates where, in addition to the weakened area 6 shown in section, the contour of the outer seal 7 was also drawn, as it exists in the areas of the outer seal 7 outside the weakened area 6. You see in Figure 4 in addition, the wall thickness d of the head plate in the area between the inner seal 5 and outer seal 7 is slightly smaller than the wall thickness D radially inside the inner seal 5.
  • the outer seal 7 is axially shortened and its wall thickness is reduced, as a result of which the outer seal 7 is more easily stretchable in the weakened area 6 and yields with less internal excess pressure than would be the case if the outer seal 7 was formed uniformly with full wall thickness and axial length as in area I and the rest area would be the case.
  • Figure 5A shows a small section of the head plate 1 with the seal 7 extending downwards from the head plate 1, whereby the Figure 5A is a plan view of the inner surface of the outer seal 7, which normally comes into sealing contact with the outer surface 22 of the bottle neck.
  • the inner surface of the outer seal has a small groove-like recess 6 ', which bridges the area in the axial direction in which the seal rests tightly against the outside 22 of the bottle neck 20.
  • This is again in a section running through the recess 6' Figure 5B shown schematically.
  • the cross section of the groove-like recess 6 'as shown in Figure 5B detects less than 0.5 mm 2 , in particular less than 0.2 mm 2 .
  • Those in the cut according to Figure 5B Approximately semicircular recess 6' could, for example, have a radius of 0.1 to 0.2 mm.
  • Figures 6A and 6B represent another closure cap in which, instead of a recess 6', a radially inwardly projecting web or a rib or a projection 6" is provided. Even if the wall thickness of the outer seal 7 is in the circumferential direction of the outer seal and on both sides of the projection or the rib 6" is constant, short sections of the inner seal 7 are lifted off the outer surface 22 of the bottle neck 20 on both sides of the rib 6", which effectively results in two small recesses 6' being formed on both sides of the rib 6".
  • the rib 6" is dimensioned such that the cross section of the recesses 6' formed in this way does not total more than 0.5 mm 2 , preferably less than 0.2 mm 2 .
  • the rib 6 extends in a straight or curved manner in the axial direction over the sealing area of the outer seal 7, so that the recess 6 'connects the space between the outer and inner seals to the outside of the bottle neck 20.
  • Figure 7 finally shows an embodiment according to the invention, in which the outer seal 7 has been axially shortened in an angular range ⁇ , so that in the angular sector ⁇ of the weakened area 16 there is only very small axial contact between the outer seal 7 or the weakened area 16 and the bottle neck 20 or its outer surface 22 consists.
  • This is dimensioned such that when the head plate is curved, the outer seal, despite its proximity to an imaginary pivot point of the curved part of the head plate 1, still shifts axially upwards sufficiently to open a gas passage.
  • the invention is essentially based on two effects, namely, on the one hand, using the arching of the head plate that occurs under internal pressure in order to first open the internal seal to such an extent that undesirably high internal pressure of e.g. B more than 3 bar is passed on to the outer seal.
  • this external seal is also like this, at least in an angular sector weakened that when exposed to the z. B. pressure exceeding 3 bar also gives way and the pressure can be reduced by gas escaping from the container.
  • the invention also particularly relates to a combination of a container neck or a container with a plastic closure, the maximum outer diameter of the outer seal being between 0.2 and 0.4 mm larger than the corresponding inner diameter of the container neck opening, while the inner diameter of the outer seal is also approximately 0.2 to 0.4 mm smaller than the corresponding outer diameter of the container neck in the respective angular position.
  • the closure according to the invention is particularly suitable for containers with cylindrical container necks that have an inner diameter of 40 or 30 mm, but can also be used for smaller closure diameters of, for example, 28 mm.
  • the embodiments described above are therefore adapted in terms of their dimensions to corresponding standardized container necks or bottle necks.

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  • Mechanical Engineering (AREA)
  • Closures For Containers (AREA)

Claims (17)

  1. Bouchon en matière plastique destiné à être placé avec complémentarité de forme et de façon étanche sur le goulot d'un contenant pour liquide, comprenant une plaque de tête (1) prévue pour couvrir une ouverture de contenant et un joint d'étanchéité extérieur (7) s'étendant de façon périphérique sensiblement parallèlement au bord de la plaque de tête (1), qui est destiné à venir en prise avec la face extérieure d'un goulot de contenant (20) définissant l'ouverture du contenant, ainsi qu'un joint d'étanchéité intérieur (5) s'étendant de façon périphérique à l'intérieur du et parallèlement au joint d'étanchéité extérieur (7) qui est destiné à s'engager avec la face intérieure du goulot de contenant, les joints d'étanchéité extérieur et intérieur (7, 5) faisant chacun saillie sur une face intérieure (11) de la plaque de tête (1) en direction du goulot de contenant à couvrir par la plaque de tête, le joint d'étanchéité extérieur (7) comprenant dans au moins une section de pourtour une zone d'affaiblissement (6, 6', 6", 16), le bouchon étant configuré de façon que le joint d'étanchéité extérieur cède dans la zone d'affaiblissement (6, 6', 6", 16) à une surpression intérieure moins grande que sans la zone d'affaiblissement et cède notamment à une surpression intérieure moins grande que dans les autres zones du joint d'étanchéité extérieur, le bouchon en matière plastique étant configuré comme bouchon fileté, le bouchon fileté (100) comprenant une plaque de tête (1) et une enveloppe de capuchon cylindrique (2) pourvue d'un taraudage (3), qui définissent un axe (50) du bouchon, les joints d'étanchéité extérieur et intérieur étant configurés comme des entretoises s'étendant parallèlement et de façon annulaire à une distance de l'enveloppe de capuchon, et la zone affaiblie étant limitée à un secteur angulaire (α) mesuré par rapport à l'axe, caractérisé en ce que la zone d'affaiblissement (6, 6', 6", 16) est constituée d'une zone circonférentielle axialement raccourcie dans le secteur angulaire (α) du joint d'étanchéité extérieur.
  2. Bouchon fileté selon la revendication 1, caractérisé en ce qu'il comprend une zone d'étanchéité qui est une zone axiale du joint d'étanchéité extérieur ayant une diamètre intérieur constant, qui englobe, au moins en partie, le tiers central de la longueur axiale du joint d'étanchéité extérieur et correspond au maximum à la longueur axiale du joint d'étanchéité extérieur.
  3. Bouchon fileté selon la revendication 2, caractérisé en ce que la zone affaiblie (6, 6', 6", 16) est formée par une rainure (6') ou une nervure (6") s'étendant sur la surface intérieure du joint d'étanchéité extérieur, qui s'étend sur le côté intérieur du joint d'étanchéité extérieur au-delà de l'extension axiale de la zone d'étanchéité du joint d'étanchéité extérieur.
  4. Bouchon fileté selon la revendication 3, caractérisé en ce que la rainure (6') ou la nervure (6") s'étend essentiellement axialement et a une section transversale de moins de 0,05 mm2, plus particulièrement moins de 0,02 mm2, et a, par exemple, une largeur et une profondeur respectivement de 0,1 mm.
  5. Bouchon fileté selon l'une des revendications 1 à 4, caractérisé en ce que la longueur axiale de la zone de la circonférence raccourcie est inférieure aux 2/3 de la longueur axiale du joint d'étanchéité extérieur en dehors de la zone affaiblie (6, 6', 6", 16).
  6. Bouchon fileté selon l'une des revendications précédentes, caractérisé en ce que la zone affaiblie (6) se compose d'une zone de circonférence du joint d'étanchéité extérieur (7) avec une épaisseur de paroi diminuée par rapport au joint d'étanchéité extérieur (7) restant, le joint d'étanchéité extérieur (7) ayant, dans la zone affaiblie (6), le même rayon intérieur que le joint d'étanchéité extérieur (7) du restant, mais ayant cependant un rayon extérieur plus petit.
  7. Bouchon fileté selon la revendication 6, caractérisé en ce que l'épaisseur de paroi diminuée du joint d'étanchéité extérieur dans la zone affaiblie (6) s'étend de manière axiale sur au moins une partie du tiers axial central de la longueur du joint d'étanchéité extérieur et est moins que la moitié de l'épaisseur de paroi en dehors du secteur d'affaiblissement, l'étendue de la zone affaiblie (6) étant limitée, en direction circonférentielle, de préférence à un angle circonférentiel entre 20° et 90°, notamment entre 40° et 70°.
  8. Bouchon fileté selon l'une des revendications précédentes, caractérisé en ce que la zone affaiblie avec une épaisseur de paroi diminuée s'étend de manière axiale d'une extrémité axiale libre jusqu'à au moins le tiers axial supérieur, par rapport à l'étendue axiale du joint d'étanchéité extérieur en dehors de la zone affaiblie.
  9. Bouchon fileté selon l'une des revendications précédentes, caractérisé en ce qu'une partie (14) en forme de disque annulaire de la plaque de tête (1) définit, entre les joints d'étanchéité extérieur et intérieur, une surface de butée (4) axiale pour la surface frontale (24) d'une ouverture de goulot de contenant et que le diamètre extérieur maximal du joint d'étanchéité intérieur (5) est prévu à une distance axiale entre 0,4 et 1,0 mm de la surface de butée.
  10. Bouchon fileté selon la revendication 9, caractérisé en ce qu'au passage de la partie (4) en forme de disque annulaire de la plaque de tête (1) au joint d'étanchéité intérieur (5), il est prévu une rainure périphérique passant dans la surface intérieure (11) de la plaque de tête.
  11. Bouchon fileté selon l'une des revendications précédentes, caractérisé en ce que le joint d'étanchéité intérieur (5) a une longueur axiale d'au moins 2 mm avec une partie d'extrémité se réduisant de façon conique de son diamètre maximum à son extrémité libre axiale.
  12. Bouchon fileté selon l'une des revendications précédentes, caractérisé en ce que le diamètre extérieur maximal du joint d'étanchéité intérieur est d'au moins 1,5 mm plus grand que son diamètre intérieur maximal.
  13. Bouchon fileté selon l'une des revendications précédentes, caractérisé en ce qu'il est en polyéthylène et que l'épaisseur de paroi de la plaque de tête est de 1,2 mm maximum à l'intérieur de la zone entourée par le joint d'étanchéité extérieur.
  14. Contenant pour des liquides, avec un goulot de contenant sur lequel un bouchon fileté est fixé fermement et de manière étanche, caractérisé en ce qu'il comprend un bouchon fileté selon l'une des revendications 1 à 13 ci-avant.
  15. Contenant selon la revendication 14, caractérisé en ce que le goulot de contenant comprend un filetage extérieur et que le bouchon fileté est un bouchon en matière plastique.
  16. Contenant selon la revendication 14 ou 15, caractérisé en ce que le rayon extérieur maximal du joint d'étanchéité intérieur est de 0,3 à 0,7 mm plus grand que le rayon intérieur nominal du goulot de contenant à la position respective.
  17. Contenant avec bouchon fileté selon l'une des revendications 15 ou 16, caractérisé en ce qu'un rayon intérieur constant du joint d'étanchéité extérieur, dans la mesure où celui-ci entre en contact pour étanchéité avec la partie extérieure (22) du goulot de contenant (20), est de 0,3 à 0,7 mm plus petit que le rayon extérieur constant nominal du goulot de contenant (20) dans la zone de contact pour étanchéité avec le joint d'étanchéité extérieur.
EP19736350.0A 2018-07-05 2019-07-02 Bouchon fileté doté d'un joint d'étanchéité réglé Active EP3817990B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102018116295.2A DE102018116295A1 (de) 2018-07-05 2018-07-05 Schraubverschluss mit kontrollierter Dichtung
PCT/EP2019/067690 WO2020007832A1 (fr) 2018-07-05 2019-07-02 Bouchon fileté doté d'un joint d'étanchéité réglé

Publications (3)

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EP3817990A1 EP3817990A1 (fr) 2021-05-12
EP3817990C0 EP3817990C0 (fr) 2024-02-14
EP3817990B1 true EP3817990B1 (fr) 2024-02-14

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EP19736350.0A Active EP3817990B1 (fr) 2018-07-05 2019-07-02 Bouchon fileté doté d'un joint d'étanchéité réglé

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US (1) US11939124B2 (fr)
EP (1) EP3817990B1 (fr)
CN (1) CN112469637B (fr)
BR (1) BR112020024220A2 (fr)
DE (1) DE102018116295A1 (fr)
WO (1) WO2020007832A1 (fr)

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* Cited by examiner, † Cited by third party
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US11591141B2 (en) * 2020-07-08 2023-02-28 Veraseal Pty Limited Closures and vessels with closures
EP4188822A1 (fr) * 2020-07-29 2023-06-07 Saint-Gobain Performance Plastics Corporation Fermeture, système combiné de contenant et de fermeture, et procédé d'utilisation de ceux-ci

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Also Published As

Publication number Publication date
CN112469637A (zh) 2021-03-09
EP3817990A1 (fr) 2021-05-12
WO2020007832A1 (fr) 2020-01-09
BR112020024220A2 (pt) 2021-02-17
CN112469637B (zh) 2022-08-09
EP3817990C0 (fr) 2024-02-14
US20210206545A1 (en) 2021-07-08
DE102018116295A1 (de) 2020-01-30
US11939124B2 (en) 2024-03-26

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