EP3686125B1 - Pressure relief valve with floating membrane and packaging container - Google Patents

Pressure relief valve with floating membrane and packaging container Download PDF

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Publication number
EP3686125B1
EP3686125B1 EP19197913.7A EP19197913A EP3686125B1 EP 3686125 B1 EP3686125 B1 EP 3686125B1 EP 19197913 A EP19197913 A EP 19197913A EP 3686125 B1 EP3686125 B1 EP 3686125B1
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EP
European Patent Office
Prior art keywords
membrane
pressure relief
relief valve
sealing surface
fluid
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EP19197913.7A
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German (de)
French (fr)
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EP3686125A1 (en
Inventor
Jenny Haase
Herbert Stotkiewitz
Peter Knappe
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Syntegon Technology GmbH
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Syntegon Technology GmbH
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Publication of EP3686125A1 publication Critical patent/EP3686125A1/en
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    • 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
    • B65D77/00—Packages formed by enclosing articles or materials in preformed containers, e.g. boxes, cartons, sacks or bags
    • B65D77/22—Details
    • B65D77/225—Pressure relief-valves incorporated in a container wall, e.g. valves comprising at least one elastic element

Definitions

  • the present invention relates to a pressure relief valve for a packaging container and a packaging container.
  • pressure relief valves in packaging containers which are used for packaging a product.
  • the pressure relief valve allows gases that are produced inside the packaging to be discharged from the packaging container.
  • the need for such a possibility of gas escaping from the packaging container arises, for example, in the case of a filling which can still outgas even after packaging and can therefore generate an overpressure in the packaging container.
  • the penetration of air, in particular of the oxygen present in the air is often to be avoided in order to maintain the quality of the filling material.
  • a pressure relief valve used for this purpose is shown, for example, in EP 2 396 244 B1 .
  • the pressure relief valve according to the invention for a packaging container with the features of claim 1 offers the advantage of improved sealing of the packaging container and improved opening behavior.
  • a change between open and closed state of the pressure relief valve closes earlier after the pressures inside and outside of the packaging container have equalized, that is to say after an excess pressure in the packaging container has been reduced by gas escaping from the packaging container into the environment.
  • penetration of air into the packaging container is prevented more reliably.
  • the pressure relief valve comprises a base body with an edge region and with a sealing surface, the sealing surface surrounding at least one through-opening which extends through the base body.
  • the through opening is preferably formed in the sealing surface.
  • the edge area can be connected to a wall of the packaging container in a sealing manner.
  • the edge area which in particular surrounds the sealing surface in a ring shape, can be connected to an inside of the wall of the packaging container, so that the pressure relief valve is arranged inside the packaging container.
  • the connection between the edge area and the wall can be produced in a variety of ways.
  • the overpressure valve can be sealed to the wall of the packaging container at the edge area by means of an ultrasonic connection.
  • an adhesive connection would also be possible.
  • the pressure relief valve comprises a first membrane which is arranged over the passage opening and at least partially covers the sealing surface.
  • the pressure relief valve according to the invention comprises a second membrane which at least partially covers the first membrane.
  • a fluid is provided, which is arranged on the sealing surface, so that the fluid is arranged between the sealing surface and the first membrane.
  • the first membrane is held floating on the sealing surface and the second membrane is also held floating on the first membrane by means of the fluid.
  • a silicone oil or a similar fluid which is suitable as a sealing liquid is preferably provided as the fluid. According to the invention, the fluid thus brings about lateral mobility of the first membrane and the second membrane on the sealing surface and within the edge region.
  • the sealing effect of the pressure relief valve is achieved through the interaction of the sealing surface, the first membrane, the second membrane and the fluid.
  • the fluid causes adhesion, as a result of which the first membrane adheres to the sealing surface and thus causes the through-opening to be sealed.
  • the capillary effect also ensures that the fluid flows evenly between the sealing surface and first membrane is distributed. Since the through-opening also has a very small Having a cross-section, preferably in the range of a few tenths of a millimeter, in particular less than 0.5 mm, the capillary effect also prevents the fluid from flowing out through the through-opening.
  • a gas channel is formed in the fluid, which extends from the passage opening through the fluid and slightly raises the first membrane.
  • the gas can flow out to the environment through this gas duct, as a result of which a pressure equalization is brought about.
  • the first membrane is pulled towards the sealing surface again by the adhesive force of the fluid and the gas channel is closed so that the pressure relief valve closes tightly again.
  • the pressure relief valve according to the invention comprises a plurality of membranes, a particularly good sealing effect and an optimized response of the pressure relief valve when opening and closing are achieved.
  • the floating arrangement of the first membrane has a particularly favorable effect on the response of the pressure relief valve to changes in pressure.
  • the second membrane also has a favorable effect on the sealing effect and ensures particularly low oxygen diffusion through the pressure relief valve.
  • the first membrane and the second membrane are formed from a flexible material. This interplay of the first membrane and the second membrane is particularly advantageous since the first membrane and the second membrane also have a certain mobility relative to one another due to the arrangement according to the invention in the pressure relief valve.
  • the first membrane and the second membrane can be dimensioned differently, for example with regard to their thicknesses. As a result, the first membrane and the second membrane can each be optimally adapted to the corresponding requirements with regard to the opening and closing behavior at certain pressure differences across the pressure relief valve for different purposes of use.
  • the fluid is preferably arranged completely between the first membrane and the sealing surface and between the first membrane and the second membrane.
  • the fluid is evenly distributed between these elements by the capillary effect. This results in a particularly favorable floating arrangement of the first membrane, which has a particularly advantageous effect on the sealing effect of the pressure relief valve.
  • the fluid causes adhesion between the first membrane and the sealing surface as well as between the first membrane and the second membrane.
  • a first outer dimension of the first membrane is smaller than or equal to a second outer dimension of the second membrane.
  • the first outside dimension and the second outside dimension are each considered in a plane parallel to the sealing surface.
  • the first outside dimension is between 5% and 10% less than the second outside dimension.
  • the two membranes each have circular cross-sections in the plane parallel to the sealing surface, as a result of which the first outside dimension is a first diameter and the second outside dimension is a second diameter.
  • Such a configuration of the first membrane with the same or smaller first external dimension compared to the second membrane favors a uniform distribution of the fluid between the two membranes and between the first membrane and the sealing surface due to the capillary effect. At the same time, this promotes the adhesive force that the fluid brings about between the sealing surface and the first membrane and between the first membrane and the second membrane, which consequently results in a particularly good sealing effect of the pressure relief valve.
  • the first external dimension of the first membrane and a position of the at least one through-opening in the sealing surface are particularly preferably matched to one another in such a way that the first membrane completely covers the at least one through-opening.
  • the passage opening remains covered by the first membrane even with maximum lateral displacement of the first membrane on the sealing surface and within the base body. If several through-openings are formed in the sealing surface, each of these through-openings is always covered by the first membrane.
  • a minimum first external dimension and/or the positions of the through-openings are selected in such a way that the through-openings remain covered by the first membrane even when the first membrane is maximally displaced laterally.
  • the maximum lateral displacement means that the first membrane is displaced so far on the sealing surface that the first membrane touches the edge area. This ensures that the pressure relief valve functions safely and reliably at all times.
  • a thickness ratio of a first thickness of the first membrane to a second thickness of the second membrane is between 1:1 and 1:10.
  • the thickness ratio is between 1:2 and 1:6.
  • the thickness ratio is particularly preferably 1:4, ie the second membrane is advantageously four times as thick as the first membrane.
  • the first membrane can thus be designed to be particularly flexible in order to ensure that the pressure relief valve responds sensitively even at low excess pressures.
  • the second membrane can be made more rigid in order to guarantee good sealing against the environment and sufficient stability of the arrangement and thus ensure the functional reliability of the pressure relief valve.
  • a ratio of a fluid volume of the fluid to an internal volume of the base body is preferably at least 3:100. This ratio is preferably at least equal to 5:100 and more preferably at most 3:10.
  • the entire volume enclosed by the base body is regarded as the internal volume of the base body. If the edge area of the base body is sealed to the inside of the wall of the packaging container, the internal volume is limited by the sealing surface, edge area and inside of the wall. This ensures that an optimal fluid volume is available in relation to the base body, which, due to the adhesive forces, is ultimately primarily responsible for the adhesion of the first membrane to the sealing surface and thus for the sealing effect of the pressure relief valve.
  • the two through-openings are formed in the base body.
  • the two through openings are eccentric and symmetrical to each other with respect to a central axis of the base body arranged.
  • the opening and closing behavior of the pressure relief valve can be further improved. Due to the eccentric arrangement of the through-openings, they are closer to the edges of the membranes. Thus, the outflowing gas has to cover a smaller distance through the fluid during a compensation process of an overpressure in the packaging container. Thus, the resistance to opening the valve is even lower.
  • reclosing is also improved, since when the pressure relief valve is open, only a smaller part of the first membrane, namely primarily the corresponding edge regions of the first membrane radially outside the through-openings, is deformed and lifted off the sealing surface. This means that only this area has to be deformed back again in order to close it securely again.
  • the first membrane and the second membrane are each designed as circular foil discs. That is, the first diaphragm and the second diaphragm have a circular cross section, each of which is made very thin to have a sheet-like character. It is particularly favorable if the first membrane and the second membrane are each formed from a plastic. As a result, the two membranes can be produced in a particularly simple and cost-effective manner.
  • the first membrane preferably has a higher flexibility than the second membrane.
  • the first membrane can be deformed more easily and, for example, partial areas of the first membrane can be lifted off the sealing surface more easily in order to form the gas channel.
  • the second membrane can be made more rigid than the first membrane in order to exert a certain restoring force on the first membrane, as a result of which the pressure relief valve closes again particularly quickly and reliably after a pressure equalization between the packaging container and the environment
  • the base body has a round cross-sectional shape.
  • the sealing surface has a circular cross section.
  • the pressure relief valve further includes at least one third membrane.
  • the third membrane is arranged between the first membrane and the second membrane.
  • the mobility of the membrane arrangement can be further increased in order to further optimize the opening and closing behavior of the pressure relief valve.
  • the base body is preferably an injection molded part.
  • the base body is particularly preferably formed from a plastic.
  • the base body can thus be produced in a particularly simple and cost-effective manner, with the geometry of the base body being able to be designed in a simple and flexible manner.
  • the invention relates to a packaging container which comprises at least one pressure relief valve according to the invention.
  • the packaging container can be used for packaging food, for example. It is particularly favorable when the packaging container is an aroma protection packaging for coffee.
  • the packaging container with the pressure relief valve according to the invention allows products, such as coffee, to be packaged airtight, with overpressure occurring inside the packaging container due to outgassing of the products being reliably compensated for by means of the pressure relief valve.
  • the overpressure valve also reliably prevents oxygen from penetrating into the closed packaging container.
  • the figure 1 shows a simplified schematic sectional view of a pressure relief valve 1 according to a first embodiment of the invention.
  • the pressure relief valve 1 is connected to a wall 10 of a closed packaging container 100, only a small section of this wall 10 being shown.
  • the pressure relief valve 1 is attached to a side 11 of the wall 10 facing an interior space I of the packaging container 100 .
  • the packaging container 100 can be used for packaging filling goods, such as foodstuffs of all kinds.
  • a packaging container 100 is suitable as an aroma protection packaging for coffee.
  • the pressure relief valve 1 according to the invention ensures that gases can escape from the interior I of the packaging container 100 to an environment U, with air penetrating into the interior I of the packaging container 100 through the pressure relief valve 1 in the opposite direction.
  • Such a sealing of the packaging container 100 with the simultaneous possibility of compensating for an overpressure is particularly advantageously possible with the overpressure valve 1 .
  • two holes 12, 13 are formed in the wall 10 of the packaging container 100, each of which extends through the wall 10.
  • the pressure relief valve 1 comprises a base body 2 , a first membrane 6 and a second membrane 7 .
  • the base body 2 is pot-shaped and essentially concentric with a central axis 21 .
  • the base body 2 has a disk-shaped sealing area 20 which is adjoined by an annular edge area 3 .
  • the edge area 3 is connected to the wall 10 of the packaging container 100 at an end opposite the sealing area 20 .
  • the connection between edge area 3 and wall 10 is an ultrasonic connection.
  • An internal volume V of the base body 2 is thus enclosed by the base body 2 and the wall 10 of the packaging container 100 .
  • a surface of the sealing area 20 facing the inner volume V forms a sealing surface 4 of the pressure relief valve 1.
  • the sealing surface 4 is a flat surface.
  • Two through openings 51 , 52 are formed in the sealing surface 4 and each extend through the sealing region 20 of the base body 2 .
  • the two through openings 51, 52 are formed eccentrically and symmetrically to the central axis 21 of the base body 2, as well as in FIG figure 2 to see.
  • the first membrane 6 is arranged on the base body 2 in such a way that it partially covers the sealing surface 4 .
  • the first membrane 6 is arranged over the two through openings 51, 52 and covers them.
  • the second membrane 7 is arranged in such a way that it covers the first membrane 6 .
  • a fluid 8 which is a silicone oil here, is applied to the sealing surface 4 .
  • the fluid 8 is also arranged between the first membrane 6 and the second membrane 7 .
  • the first membrane 6 and the second membrane 7 are held floating on the sealing surface 4 by means of the fluid 8 in order to bring about the sealing effect of the pressure relief valve 1 .
  • the fluid 8 is evenly distributed between the first membrane 6 and the second membrane 7 by the capillary effect.
  • the fluid 8 also causes the two membranes 6 , 7 to float on the sealing surface 4 .
  • the two membranes 6, 7 together with the fluid 8 form a movable sealing arrangement, which enables a quick and reliable response when changing between opening and closing the pressure relief valve 1.
  • gas can flow out through the pressure relief valve 1 to the environment U.
  • a gas channel is formed in the overpressure valve 1, which extends from one or both of the passage openings through the fluid 8 and the first membrane 6 is slightly lifted off the sealing surface 4 at its edge. The gas can flow out to the environment U through this gas channel and via the holes 12, 13, as a result of which a pressure equalization is brought about.
  • the second membrane 7 additionally supports this reclosing.
  • the second membrane 7 brings about a certain pretension, which promotes a return of the first membrane 6 back into its initial position.
  • the capillary effect causes the fluid 8 to be distributed evenly around the first membrane 6, ie it also promotes the first membrane 6 deforming back into its original shape.
  • first membrane 6 and the second membrane 7 are each designed as circular foil discs, as in particular in FIG figure 2 to recognize.
  • the figure 2 shows a top view of the pressure relief valve 1 of FIG figure 1 , wherein the packaging container is not shown.
  • the first membrane 6, the second membrane 7 and the base body 2 are each formed with a circular cross-section and, in unshifted state shown here, arranged concentrically to each other.
  • a first diameter D1 of the first membrane 6 is 5% smaller than a second diameter D2 of the second membrane 7.
  • the second diameter D2 is also 10% smaller than an inner diameter D3 of the edge area 3 of the base body 2.
  • the inner diameter D3 therefore also corresponds to a Outer diameter of the sealing surface 4. Due to the first diameter D1, which is smaller than the second diameter D2, the fluid 8 can be distributed evenly between the first membrane 6 and the second membrane 7 particularly easily due to the capillary effect, since the fluid 8 easily flows around an edge of the first Membrane 6 can flow.
  • the first membrane 6 also has a first thickness B1 which is equal to a second thickness B2 of the second membrane 7 .
  • the first diameter D1 and the positions of the two through-openings 51, 52 are matched to one another in such a way that the first membrane 6 still completely covers both through-openings 51, 52 even with maximum lateral displacement on the sealing surface 4. This means that even if the first membrane 6 is displaced so far in the lateral direction A that it is in contact with the edge area 3 , each of the through-openings 51 , 52 is still completely covered by the first membrane 6 .
  • a fluid volume of the fluid 8 is in a ratio of 3:100 to the internal volume V of the base body 2. This ensures that a sufficient fluid volume is available to finally ensure the adhesion of the first membrane 6 to the sealing surface 4 and thus to achieve the sealing effect. In addition, this ratio also ensures that there is no superfluous fluid volume, which could have a negative effect on targeted, reliable adhesion of the first membrane 6 to the sealing surface 4 and of the second membrane 7 to the first membrane 6 .
  • the figure 3 shows a simplified schematic sectional view of a pressure relief valve 1 according to a second embodiment of the invention.
  • the second embodiment essentially corresponds to the first embodiment in FIGS Figures 1 and 2 the two membranes 6', 7 ⁇ having different proportions relative to one another.
  • the first diameter D1' of the first membrane 6' and the second diameter D2' of the second membrane 7 ⁇ are identical.
  • the second thickness B2' of the second membrane 7 ⁇ in the second exemplary embodiment is four times greater than the first thickness B1' of the first membrane 6 ⁇ .
  • the second membrane 7' is significantly more rigid than the first membrane 6' and a more stable arrangement of the two membranes 6', 7' can be achieved.
  • the pressure relief valve 1 opens later than in the first exemplary embodiment, i.e.
  • the figure 4 shows a simplified schematic sectional view of a pressure relief valve 1 according to a third embodiment of the invention.
  • the third exemplary embodiment essentially corresponds to the first exemplary embodiment in FIGS Figures 1 and 2 a third membrane 9 is additionally provided, which is arranged between the first membrane 6 and the second membrane 7 .
  • the third membrane 9 has a third diameter D4 which is equal to the first diameter D1 of the first membrane 6 .
  • the fluid 8 is evenly distributed between all three membranes 6, 7, 9 and between the first membrane 6 and the sealing surface 4 by the capillary effect.
  • the third membrane 9 further promotes the mobility of the floating membrane arrangement and thus ensures a further optimized sealing effect of the pressure relief valve 1, in particular with regard to opening and closing for or after the equalization of an overpressure in the interior I of the packaging container 100.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Safety Valves (AREA)

Description

Stand der TechnikState of the art

Die vorliegende Erfindung betrifft ein Überdruckventil für einen Verpackungsbehälter sowie einen Verpackungsbehälter.The present invention relates to a pressure relief valve for a packaging container and a packaging container.

Bekannt ist die Verwendung von Überdruckventilen bei Verpackungsbehältern, welche zur Verpackung eines Füllgutes eingesetzt werden. Durch das Überdruckventil können innerhalb der Verpackung entstehende Gase aus dem Verpackungsbehälter ausgeleitet werden. Die Notwendigkeit einer solchen Möglichkeit eines Gasaustritts aus dem Verpackungsbehälter ergibt sich beispielsweise bei einem Füllgut, welches auch nach dem Verpacken noch ausgast und damit einen Überdruck im Verpackungsbehälter erzeugen kann. Häufig ist jedoch gleichzeitig ein Eindringen von Luft, insbesondere von dem in der Luft vorhandenen Sauerstoff, zu vermeiden, um eine Qualität des Füllgutes zu erhalten. Ein hierfür eingesetztes Überdruckventil zeigt beispielsweise die EP 2 396 244 B1 .The use of pressure relief valves in packaging containers which are used for packaging a product is known. The pressure relief valve allows gases that are produced inside the packaging to be discharged from the packaging container. The need for such a possibility of gas escaping from the packaging container arises, for example, in the case of a filling which can still outgas even after packaging and can therefore generate an overpressure in the packaging container. At the same time, however, the penetration of air, in particular of the oxygen present in the air, is often to be avoided in order to maintain the quality of the filling material. A pressure relief valve used for this purpose is shown, for example, in EP 2 396 244 B1 .

Des Weiteren sind Überdruckventile für Verpackungsbehälter bereits aus US 2012/243807 A1 , US 2016/355287 A1 , WO 2017/148754 A1 und US 5 354 133 A bekannt.Furthermore, pressure relief valves for packaging containers are already off U.S. 2012/243807 A1 , U.S. 2016/355287 A1 , WO 2017/148754 A1 and U.S. 5,354,133 A known.

Offenbarung der ErfindungDisclosure of Invention

Das erfindungsgemäße Überdruckventil für einen Verpackungsbehälter mit den Merkmalen des Anspruchs 1 bietet demgegenüber den Vorteil einer verbesserten Abdichtung des Verpackungsbehälters sowie eins verbesserten Öffnungsverhaltens. Dabei ist insbesondere ein Wechsel zwischen geöffnetem und geschlossenem Zustand des Überdruckventils optimiert. Das erfindungsgemäße Überdruckventil schließt zeitiger nach einem Ausgleich von Drücken innerhalb und außerhalb des Verpackungsbehälters, also nach einem Abbau eines Überdrucks im Verpackungsbehälter durch Ausströmen von Gas aus dem Verpackungsbehälter in die Umgebung. Zudem wird ein Eindringen von Luft in den Verpackungsbehälter zuverlässiger verhindert. Dies wird erfindungsgemäß dadurch erreicht, dass das Überdruckventil einen Grundkörper mit einem Randbereich und mit einer Dichtfläche umfasst, wobei die Dichtfläche zumindest eine Durchgangsöffnung umgibt, welche sich durch den Grundkörper erstreckt. Die Durchgangsöffnung ist vorzugsweise in der Dichtfläche ausgebildet. Der Randbereich ist dabei mit einer Wand des Verpackungsbehälters abdichtend verbindbar. Vorteilhafterweise ist der Randbereich, welcher insbesondere die Dichtfläche ringförmig umgibt, mit einer Innenseite der Wand des Verpackungsbehälters verbindbar, sodass das Überdruckventil im Inneren des Verpackungsbehälters angeordnet ist. Die Verbindung zwischen Randbereich und Wand kann dabei auf vielfältige Art und Weise hergestellt werden. Beispielsweise kann das Überdruckventil am Randbereich mittels einer Ultraschallverbindung an die Wand des Verpackungsbehälters angesiegelt werden. Alternativ wäre auch eine Klebeverbindung möglich.In contrast, the pressure relief valve according to the invention for a packaging container with the features of claim 1 offers the advantage of improved sealing of the packaging container and improved opening behavior. In particular, a change between open and closed state of the pressure relief valve. The pressure relief valve according to the invention closes earlier after the pressures inside and outside of the packaging container have equalized, that is to say after an excess pressure in the packaging container has been reduced by gas escaping from the packaging container into the environment. In addition, penetration of air into the packaging container is prevented more reliably. According to the invention, this is achieved in that the pressure relief valve comprises a base body with an edge region and with a sealing surface, the sealing surface surrounding at least one through-opening which extends through the base body. The through opening is preferably formed in the sealing surface. The edge area can be connected to a wall of the packaging container in a sealing manner. Advantageously, the edge area, which in particular surrounds the sealing surface in a ring shape, can be connected to an inside of the wall of the packaging container, so that the pressure relief valve is arranged inside the packaging container. The connection between the edge area and the wall can be produced in a variety of ways. For example, the overpressure valve can be sealed to the wall of the packaging container at the edge area by means of an ultrasonic connection. Alternatively, an adhesive connection would also be possible.

Weiterhin umfasst das Überdruckventil erfindungsgemäß eine erste Membran, welche über der Durchgangsöffnung angeordnet ist und die Dichtfläche zumindest teilweise überdeckt. Zudem umfasst das Überdruckventil erfindungsgemäß eine zweite Membran, welche die erste Membran zumindest teilweise überdeckt. Ferner ist ein Fluid vorgesehen, welches auf der Dichtfläche angeordnet ist, sodass das Fluid zwischen der Dichtfläche und der ersten Membran angeordnet ist. Erfindungsgemäß ist mittels des Fluids die erste Membran schwimmend auf der Dichtfläche gehalten und auch die zweite Membran schwimmend auf der ersten Membran gehalten. Als Fluid ist dabei vorzugsweise ein Silikonöl, oder ein ähnliches Fluid vorgesehen, welches sich als Dichtflüssigkeit eignet. Das Fluid bewirkt somit erfindungsgemäß eine laterale Beweglichkeit der ersten Membran und der zweiten Membran auf der Dichtfläche und innerhalb des Randbereichs.Furthermore, according to the invention, the pressure relief valve comprises a first membrane which is arranged over the passage opening and at least partially covers the sealing surface. In addition, the pressure relief valve according to the invention comprises a second membrane which at least partially covers the first membrane. Furthermore, a fluid is provided, which is arranged on the sealing surface, so that the fluid is arranged between the sealing surface and the first membrane. According to the invention, the first membrane is held floating on the sealing surface and the second membrane is also held floating on the first membrane by means of the fluid. A silicone oil or a similar fluid which is suitable as a sealing liquid is preferably provided as the fluid. According to the invention, the fluid thus brings about lateral mobility of the first membrane and the second membrane on the sealing surface and within the edge region.

Die Dichtwirkung des Überdruckventils wird dabei durch das Zusammenwirken von Dichtfläche, erster Membran, zweiter Membran und Fluid erzielt. Das Fluid bewirkt eine Adhäsion, wodurch die erste Membran auf der Dichtfläche haftet und damit die Abdichtung der Durchgangsöffnung bewirkt. Der Kapillareffekt sorgt weiterhin dafür, dass das Fluid gleichmäßig zwischen Dichtfläche und erster Membran verteilt ist. Da die Durchgangsöffnung zudem einen sehr kleinen Querschnitt aufweist, bevorzugt im Bereich weniger zehntel Millimeter, insbesondere kleiner als 0,5mm, verhindert der Kapillareffekt zudem ein Herausfließen des Fluids durch die Durchgangsöffnung.The sealing effect of the pressure relief valve is achieved through the interaction of the sealing surface, the first membrane, the second membrane and the fluid. The fluid causes adhesion, as a result of which the first membrane adheres to the sealing surface and thus causes the through-opening to be sealed. The capillary effect also ensures that the fluid flows evenly between the sealing surface and first membrane is distributed. Since the through-opening also has a very small Having a cross-section, preferably in the range of a few tenths of a millimeter, in particular less than 0.5 mm, the capillary effect also prevents the fluid from flowing out through the through-opening.

Sofern ein Überdruck im Verpackungsbehälter gegenüber der Umgebung vorliegt, beispielweise verursacht durch Ausgasen eines verpackten Füllgutes, bildet sich ein Gaskanal im Fluid, der sich von der Durchgangsöffnung durch das Fluid erstreckt und die erste Membran geringfügig anhebt. Durch diesen Gaskanal kann das Gas an die Umgebung ausströmen, wodurch ein Druckausgleich herbeigeführt wird. Sobald der Druckunterschied zwischen Verpackungsbehälter und Umgebung einen bestimmten Wert wieder unterschreitet, wird durch die Adhäsionskraft des Fluids die erste Membran wieder in Richtung zur Dichtfläche gezogen und der Gaskanal geschlossen, sodass das Überdrückventil wieder dichtend abschließt.If there is overpressure in the packaging container compared to the environment, for example caused by outgassing of a packaged filling, a gas channel is formed in the fluid, which extends from the passage opening through the fluid and slightly raises the first membrane. The gas can flow out to the environment through this gas duct, as a result of which a pressure equalization is brought about. As soon as the pressure difference between the packaging container and the environment falls below a certain value again, the first membrane is pulled towards the sealing surface again by the adhesive force of the fluid and the gas channel is closed so that the pressure relief valve closes tightly again.

Dadurch, dass das erfindungsgemäße Überdruckventil mehrere Membranen umfasst, wird eine besonders gute Dichtwirkung und ein optimiertes Ansprechen des Überdruckventils beim Öffnen sowie beim Schließen erzielt. Die schwimmende Anordnung der ersten Membran wirkt sich dabei besonders günstig auf ein Ansprechen des Überdruckventils auf Druckänderungen aus. Die zweite Membran wirkt sich weiter günstig auf die Dichtwirkung aus und sorgt für eine besonders niedrige Sauerstoffdiffusion durch das Überdruckventil. Insbesondere sind die erste Membran und die zweite Membran aus einem flexiblen Material ausgebildet. Dieses Zusammenspiel aus erster Membran und zweiter Membran ist besonders vorteilhaft, da durch die erfindungsgemäße Anordnung im Überdruckventil die erste Membran und die zweite Membran auch eine gewisse Beweglichkeit relativ zueinander aufweisen. Zudem können die erste Membran und die zweite Membran unterschiedlich dimensioniert werden, beispielsweise hinsichtlich ihrer Dicken. Dadurch können die erste Membran und die zweite Membran für unterschiedliche Einsatzzwecke jeweils optimal an die entsprechenden Anforderungen im Hinblick auf das Öffnungs- und Schließverhalten bei bestimmten Druckunterschieden über das Überruckventil angepasst werden.Because the pressure relief valve according to the invention comprises a plurality of membranes, a particularly good sealing effect and an optimized response of the pressure relief valve when opening and closing are achieved. The floating arrangement of the first membrane has a particularly favorable effect on the response of the pressure relief valve to changes in pressure. The second membrane also has a favorable effect on the sealing effect and ensures particularly low oxygen diffusion through the pressure relief valve. In particular, the first membrane and the second membrane are formed from a flexible material. This interplay of the first membrane and the second membrane is particularly advantageous since the first membrane and the second membrane also have a certain mobility relative to one another due to the arrangement according to the invention in the pressure relief valve. In addition, the first membrane and the second membrane can be dimensioned differently, for example with regard to their thicknesses. As a result, the first membrane and the second membrane can each be optimally adapted to the corresponding requirements with regard to the opening and closing behavior at certain pressure differences across the pressure relief valve for different purposes of use.

Die Unteransprüche haben bevorzugte Weiterbildungen der Erfindung zum Inhalt.The dependent claims relate to preferred developments of the invention.

Bevorzugt ist das Fluid jeweils vollständig zwischen der ersten Membran und der Dichtfläche sowie zwischen der ersten Membran und der zweiten Membran angeordnet. Dabei ist das Fluid durch den Kapillareffekt gleichmäßig zwischen diesen Elementen verteilt. Dadurch stellt sich eine besonders günstige schwimmende Anordnung der ersten Membran ein, was sich besonders vorteilhaft auf die Dichtwirkung des Überdruckventils auswirkt. Das Fluid bewirkt dabei sowohl eine Adhäsion zwischen erster Membran und Dichtfläche wie auch zwischen erster Membran und zweiter Membran.The fluid is preferably arranged completely between the first membrane and the sealing surface and between the first membrane and the second membrane. The fluid is evenly distributed between these elements by the capillary effect. This results in a particularly favorable floating arrangement of the first membrane, which has a particularly advantageous effect on the sealing effect of the pressure relief valve. The fluid causes adhesion between the first membrane and the sealing surface as well as between the first membrane and the second membrane.

Besonders günstig ist es, wenn eine erste Außenabmessung der ersten Membran kleiner oder gleich einer zweiten Außenabmessung der zweiten Membran ist. Die erste Außenabmessung und die zweite Außenabmessung werden dabei jeweils in einer Ebene parallel zur Dichtfläche betrachtet. Vorzugsweise ist die erste Außenabmessung zwischen 5% und 10% kleiner als die zweite Außenabmessung. Besonders günstig ist es, wenn die beiden Membranen jeweils kreisförmige Querschnitte in der Ebene parallel zur Dichtfläche aufweisen, wodurch die erste Außenabmessung ein erster Durchmesser ist und die zweite Außenabmessung ein zweiter Durchmesser ist. Eine solche Gestaltung der ersten Membran mit gleicher oder kleinerer erster Außenabmessung im Vergleich zur zweiten Membran begünstigt eine gleichmäßige Verteilung des Fluids jeweils zwischen den beiden Membranen und zwischen der ersten Membran und der Dichtfläche durch den Kapillareffekt. Dies begünstigt zugleich die Adhäsionskraft, welche das Fluid zwischen Dichtfläche und erster Membran sowie zwischen erster Membran und zweite Membran bewirkt, womit folglich eine besonders gute Dichtwirkung des Überdruckventils erzählt wird.It is particularly favorable if a first outer dimension of the first membrane is smaller than or equal to a second outer dimension of the second membrane. The first outside dimension and the second outside dimension are each considered in a plane parallel to the sealing surface. Preferably, the first outside dimension is between 5% and 10% less than the second outside dimension. It is particularly favorable if the two membranes each have circular cross-sections in the plane parallel to the sealing surface, as a result of which the first outside dimension is a first diameter and the second outside dimension is a second diameter. Such a configuration of the first membrane with the same or smaller first external dimension compared to the second membrane favors a uniform distribution of the fluid between the two membranes and between the first membrane and the sealing surface due to the capillary effect. At the same time, this promotes the adhesive force that the fluid brings about between the sealing surface and the first membrane and between the first membrane and the second membrane, which consequently results in a particularly good sealing effect of the pressure relief valve.

Besonders bevorzugt sind die erste Außenabmessung der ersten Membran und eine Position der zumindest einen Durchgangsöffnung in der Dichtfläche derart aufeinander abgestimmt, dass die erste Membran die zumindest eine Durchgangsöffnung vollständig überdeckt. Die Durchgangsöffnung bleibt dabei auch bei maximaler lateraler Verschiebung der ersten Membran auf der Dichtfläche und innerhalb des Grundkörpers von der ersten Membran überdeckt. Sofern mehrere Durchgangsöffnungen in der Dichtfläche ausgebildet sind, ist jede dieser Durchgangsöffnungen immer von der ersten Membran überdeckt.The first external dimension of the first membrane and a position of the at least one through-opening in the sealing surface are particularly preferably matched to one another in such a way that the first membrane completely covers the at least one through-opening. The passage opening remains covered by the first membrane even with maximum lateral displacement of the first membrane on the sealing surface and within the base body. If several through-openings are formed in the sealing surface, each of these through-openings is always covered by the first membrane.

Das heißt, eine minimale erste Außenabmessung und/oder die Positionen der Durchgangsöffnungen sind so gewählt, dass die Durchgangsöffnungen auch bei maximaler lateraler Verschiebung der ersten Membran noch durch diese überdeckt bleiben. Die maximale laterale Verschiebung bedeutet dabei, dass die erste Membran so weit auf der Dichtfläche verschoben ist, dass die erste Membran den Randbereich berührt. Dadurch wird jederzeit eine sichere und zuverlässige Funktion des Überdruckventils gewährleistet.This means that a minimum first external dimension and/or the positions of the through-openings are selected in such a way that the through-openings remain covered by the first membrane even when the first membrane is maximally displaced laterally. The maximum lateral displacement means that the first membrane is displaced so far on the sealing surface that the first membrane touches the edge area. This ensures that the pressure relief valve functions safely and reliably at all times.

Weiterhin ist es vorteilhaft, wenn ein Dickenverhältnis einer ersten Dicke der ersten Membran zu einer zweiten Dicke der zweiten Membran zwischen 1:1 und 1:10 liegt. Vorzugsweise liegt das Dickenverhältnis zwischen 1:2 und 1:6. Besonders bevorzugt beträgt das Dickenverhältnis 1:4, das heißt, die zweite Membran ist vorteilhafterweise viermal so dick wie die erste Membran. Somit kann die erste Membran besonders flexibel gestaltet sein, um ein sensibles Ansprechen des Überdruckventils bereits bei niedrigen Überdrücken zu gewährleisten. Zudem kann die zweite Membran starrer ausgebildet sein, um eine gute Abdichtung gegenüber der Umgebung sowie eine ausreichende Stabilität der Anordnung zu garantieren und somit die Funktionssicherheit des Überdruckventils zu gewährleisten.Furthermore, it is advantageous if a thickness ratio of a first thickness of the first membrane to a second thickness of the second membrane is between 1:1 and 1:10. Preferably the thickness ratio is between 1:2 and 1:6. The thickness ratio is particularly preferably 1:4, ie the second membrane is advantageously four times as thick as the first membrane. The first membrane can thus be designed to be particularly flexible in order to ensure that the pressure relief valve responds sensitively even at low excess pressures. In addition, the second membrane can be made more rigid in order to guarantee good sealing against the environment and sufficient stability of the arrangement and thus ensure the functional reliability of the pressure relief valve.

Bevorzugt beträgt ein Verhältnis eines Fluidvolumens des Fluids zu einem Innenvolumen des Grundkörpers mindestens 3:100. Vorzugsweise ist dieses Verhältnis mindestens gleich 5:100 und besonders bevorzugt maximal 3:10. Als Innenvolumen des Grundkörpers wird dabei das gesamte, durch den Grundkörper eingeschlossene Volumen angesehen. Für den Fall, dass der Randbereich des Grundkörpers an die Innenseite der Wand des Verpackungsbehälters angesiegelt ist, ist das Innenvolumen begrenzt durch Dichtfläche, Randbereich und Innenseite der Wand. Dadurch wird sichergestellt, dass in Bezug auf den Grundkörper ein optimales Fluidvolumen zur Verfügung steht, was aufgrund der Adhäsionskräfte schließlich hauptverantwortlich für die Haftung der ersten Membran auf der Dichtfläche und somit für die Dichtwirkung des Überdruckventils ist.A ratio of a fluid volume of the fluid to an internal volume of the base body is preferably at least 3:100. This ratio is preferably at least equal to 5:100 and more preferably at most 3:10. The entire volume enclosed by the base body is regarded as the internal volume of the base body. If the edge area of the base body is sealed to the inside of the wall of the packaging container, the internal volume is limited by the sealing surface, edge area and inside of the wall. This ensures that an optimal fluid volume is available in relation to the base body, which, due to the adhesive forces, is ultimately primarily responsible for the adhesion of the first membrane to the sealing surface and thus for the sealing effect of the pressure relief valve.

Weiterhin ist es vorteilhaft, wenn in dem Grundkörper zwei Durchgangsöffnungen ausgebildet sind. Die beiden Durchgangsöffnungen sind dabei bezüglich einer Mittelachse des Grundkörpers exzentrisch und symmetrisch zueinander angeordnet. Dadurch kann das Öffnungs- und Schließverhalten des Überdruckventils weiter verbessert werden. Durch die exzentrische Anordnung der Durchgangsöffnungen liegen diese näher an den Rändern der Membranen. Somit muss das ausströmende Gas bei einem Ausgleichsvorgang eines Überdrucks im Verpackungsbehälter eine kleinere Strecke durch das Fluid hindurch zurücklegen. Somit ist der Widerstand gegen ein Öffnen des Ventils noch geringer. Zudem wird auch das Wiederverschließen verbessert, da beim geöffneten Überdruckventil nur ein kleinerer Teil der ersten Membran, nämlich vor allem der entsprechenden Randbereiche der ersten Membran radial außerhalb der Durchgangsöffnungen, verformt und von der Dichtfläche abgehoben ist. Somit muss auch nur dieser Bereich wieder zurückverformt werden, um wieder sicher zu verschließen.Furthermore, it is advantageous if two through-openings are formed in the base body. The two through openings are eccentric and symmetrical to each other with respect to a central axis of the base body arranged. As a result, the opening and closing behavior of the pressure relief valve can be further improved. Due to the eccentric arrangement of the through-openings, they are closer to the edges of the membranes. Thus, the outflowing gas has to cover a smaller distance through the fluid during a compensation process of an overpressure in the packaging container. Thus, the resistance to opening the valve is even lower. In addition, reclosing is also improved, since when the pressure relief valve is open, only a smaller part of the first membrane, namely primarily the corresponding edge regions of the first membrane radially outside the through-openings, is deformed and lifted off the sealing surface. This means that only this area has to be deformed back again in order to close it securely again.

Besonders bevorzugt sind die erste Membran und die zweite Membran jeweils als kreisförmige Folienscheiben ausgebildet. Das heißt, die erste Membran und die zweite Membran weisen einen kreisförmigen Querschnitt auf, wobei diese jeweils sehr dünn ausgebildet sind, um einen folienartigen Charakter aufzuweisen. Besonders günstig ist es, wenn die erste Membran und die zweite Membran jeweils aus einem Kunststoff gebildet sind. Dadurch können die beiden Membranen besonders einfach und kostengünstig hergestellt werden.Particularly preferably, the first membrane and the second membrane are each designed as circular foil discs. That is, the first diaphragm and the second diaphragm have a circular cross section, each of which is made very thin to have a sheet-like character. It is particularly favorable if the first membrane and the second membrane are each formed from a plastic. As a result, the two membranes can be produced in a particularly simple and cost-effective manner.

Vorzugsweise weist die erste Membran eine höhere Flexibilität auf als die zweite Membran. Dadurch ist die erste Membran leichter verformbar und es können beispielsweise Teilbereiche der ersten Membran leichter von der Dichtfläche abgehoben werden zum Bilden des Gaskanals. Die zweite Membran kann dabei starrer als die erste Membran ausgebildet sein, um eine gewisse Rückstellkraft auf die erste Membran auszuüben, wodurch das Überdruckventil nach einem Druckausgleich zwischen Verpackungsbehälter und Umgebung wieder besonders schnell und zuverlässig schließtThe first membrane preferably has a higher flexibility than the second membrane. As a result, the first membrane can be deformed more easily and, for example, partial areas of the first membrane can be lifted off the sealing surface more easily in order to form the gas channel. The second membrane can be made more rigid than the first membrane in order to exert a certain restoring force on the first membrane, as a result of which the pressure relief valve closes again particularly quickly and reliably after a pressure equalization between the packaging container and the environment

Weiterhin ist es vorteilhaft, wenn der Grundkörper eine runde Querschnittsform aufweist. Insbesondere weist dabei die Dichtfläche einen kreisförmigen Querschnitt auf. Somit ist das Überdruckventil einfach und kostengünstig herzustellen und eine gleichmäßige Verteilung des Fluids durch den Kapillareffekt wird begünstigt.Furthermore, it is advantageous if the base body has a round cross-sectional shape. In particular, the sealing surface has a circular cross section. Thus, the pressure relief valve is easy and inexpensive to manufacture and an even distribution of the fluid is promoted by the capillary effect.

Vorzugsweise umfasst das Überdruckventil ferner zumindest eine dritte Membran. Die dritte Membran ist dabei zwischen der ersten Membran und der zweiten Membran angeordnet. Dadurch kann die Beweglichkeit der Membrananordnung weiter gesteigert werden, um das Öffnungs- und Schließverhalten des Überdruckventils weiter zu optimieren.Preferably, the pressure relief valve further includes at least one third membrane. The third membrane is arranged between the first membrane and the second membrane. As a result, the mobility of the membrane arrangement can be further increased in order to further optimize the opening and closing behavior of the pressure relief valve.

Bevorzugt ist der Grundkörper ein Spritzgussteil. Besonders bevorzugt ist der Grundkörper aus einem Kunststoff gebildet. Somit ist der Grundkörper besonders einfach und kostengünstig herzustellen, wobei die Geometrie des Grundkörpers einfach und flexibel gestaltet werden kann.The base body is preferably an injection molded part. The base body is particularly preferably formed from a plastic. The base body can thus be produced in a particularly simple and cost-effective manner, with the geometry of the base body being able to be designed in a simple and flexible manner.

Ferner betrifft die Erfindung einen Verpackungsbehälter, der zumindest ein erfindungsgemäßes Überdruckventil umfasst. Der Verpackungsbehälter kann beispielsweise zur Verpackung von Lebensmitteln eingesetzt werden. Besonders günstig ist es, wenn der Verpackungsbehälter eine Aromaschutzverpackung für Kaffee ist. Durch den Verpackungsbehälter mit dem erfindungsgemäßen Überdruckventil können Produkte, wie beispielsweise Kaffee, luftdicht verpackt werden, wobei ein im Inneren des Verpackungsbehälters durch Ausgasen der Produkte entstehender Überdruck mittels des Überdruckventils zuverlässig ausgeglichen werden kann. Dabei wird insbesondere auch ein Eindringen von Sauerstoff in den geschlossenen Verpackungsbehälter zuverlässig durch das Überdruckventil verhindert.Furthermore, the invention relates to a packaging container which comprises at least one pressure relief valve according to the invention. The packaging container can be used for packaging food, for example. It is particularly favorable when the packaging container is an aroma protection packaging for coffee. The packaging container with the pressure relief valve according to the invention allows products, such as coffee, to be packaged airtight, with overpressure occurring inside the packaging container due to outgassing of the products being reliably compensated for by means of the pressure relief valve. In particular, the overpressure valve also reliably prevents oxygen from penetrating into the closed packaging container.

Kurze Beschreibung der ZeichnungenBrief description of the drawings

Im Folgenden wird die Erfindung anhand von Ausführungsbeispielen in Verbindung mit den Figuren beschrieben. In den Figuren sind funktional gleiche Bauteile jeweils mit gleichen Bezugszeichen gekennzeichnet. Dabei zeigt:

Figur 1
eine vereinfachte schematische Schnittansicht eines Überdruckventils gemäß einem ersten Ausführungsbeispiel der Erfindung,
Figur 2
eine Draufsicht des Überdruckventils der Figur 1,
Figur 3
eine vereinfachte schematische Schnittansicht eines Überdruckventils gemäß einem zweiten Ausführungsbeispiel der Erfindung, und
Figur 4
eine vereinfachte schematische Schnittansicht eines Überdruckventils gemäß einem dritten Ausführungsbeispiel der Erfindung.
The invention is described below using exemplary embodiments in conjunction with the figures. In the figures, components that are functionally the same are each identified by the same reference symbols. It shows:
figure 1
a simplified schematic sectional view of a pressure relief valve according to a first embodiment of the invention,
figure 2
a top view of the pressure relief valve of FIG figure 1 ,
figure 3
a simplified schematic sectional view of a pressure relief valve according to a second embodiment of the invention, and
figure 4
a simplified schematic sectional view of a pressure relief valve according to a third embodiment of the invention.

Bevorzugte Ausführungsformen der ErfindungPreferred Embodiments of the Invention

Die Figur 1 zeigt eine vereinfachte schematische Schnittansicht eines Überdruckventils 1 gemäß einem ersten Ausführungsbeispiel der Erfindung. Das Überdruckventil 1 ist an einer Wand 10 eines geschlossenen Verpackungsbehälters 100 verbunden, wobei nur ein kleiner Ausschnitt dieser Wand 10 dargestellt ist. Das Überdruckventil 1 ist dabei an einer einem Innenraum I des Verpackungsbehälters 100 zugewandten Seite 11 der Wand 10 befestigt.The figure 1 shows a simplified schematic sectional view of a pressure relief valve 1 according to a first embodiment of the invention. The pressure relief valve 1 is connected to a wall 10 of a closed packaging container 100, only a small section of this wall 10 being shown. The pressure relief valve 1 is attached to a side 11 of the wall 10 facing an interior space I of the packaging container 100 .

Der Verpackungsbehälter 100 kann für eine Verpackung von Füllgütern, wie Lebensmitteln verschiedenster Art eingesetzt werden. Beispielsweise eignet sich ein solcher Verpackungsbehälter 100 als Aromaschutzverpackung für Kaffee. Durch das erfindungsgemäße Überdruckventil 1 wird dabei erreicht, dass Gase aus dem Innenraum I des Verpackungsbehälters 100 an eine Umgebung U entweichen können, wobei in umgekehrter Richtung ein Eindringen von Luft in den Innenraum I des Verpackungsbehälters 100 durch das Überdruckventil 1 vermieden wird. Eine solche Abdichtung des Verpackungsbehälters 100 bei gleichzeitiger Möglichkeit des Ausgleichs eines Überdrucks ist durch das Überdruckventil 1 besonders vorteilhaft möglich.The packaging container 100 can be used for packaging filling goods, such as foodstuffs of all kinds. For example, such a packaging container 100 is suitable as an aroma protection packaging for coffee. The pressure relief valve 1 according to the invention ensures that gases can escape from the interior I of the packaging container 100 to an environment U, with air penetrating into the interior I of the packaging container 100 through the pressure relief valve 1 in the opposite direction. Such a sealing of the packaging container 100 with the simultaneous possibility of compensating for an overpressure is particularly advantageously possible with the overpressure valve 1 .

Um ein Entweichen von Gasen aus dem Innenraum I des Verpackungsbehälters 100 an die Umgebung U zu erlauben, sind dabei in der Wand 10 des Verpackungsbehälters 100 zwei Löcher 12, 13 ausgebildet, welche sich jeweils durch die Wand 10 erstrecken.In order to allow gases to escape from the interior I of the packaging container 100 to the environment U, two holes 12, 13 are formed in the wall 10 of the packaging container 100, each of which extends through the wall 10.

Das Überdruckventil 1 umfasst einen Grundkörper 2, eine erste Membran 6 und eine zweite Membran 7. Der Grundkörper 2 ist dabei topfförmig und im Wesentlich konzentrisch zu einer Mittelachse 21 ausgebildet.The pressure relief valve 1 comprises a base body 2 , a first membrane 6 and a second membrane 7 . The base body 2 is pot-shaped and essentially concentric with a central axis 21 .

Der Grundkörper 2 weist einen scheibenförmigen Dichtbereich 20 auf, an welchen ein ringförmiger Randbereich 3 angrenzt. An einem dem Dichtbereich 20 gegenüberliegenden Ende ist der Randbereich 3 mit der Wand 10 des Verpackungsbehälters 100 verbunden. Die Verbindung zwischen Randbereich 3 und Wand 10 ist eine Ultraschallverbindung. Durch Grundkörper 2 und Wand 10 des Verpackungsbehälters 100 wird somit ein Innenvolumen V des Grundkörpers 2 eingeschlossen.The base body 2 has a disk-shaped sealing area 20 which is adjoined by an annular edge area 3 . The edge area 3 is connected to the wall 10 of the packaging container 100 at an end opposite the sealing area 20 . The connection between edge area 3 and wall 10 is an ultrasonic connection. An internal volume V of the base body 2 is thus enclosed by the base body 2 and the wall 10 of the packaging container 100 .

Eine dem Innenvolumen V zugewandte Oberfläche des Dichtbereichs 20 bildet eine Dichtfläche 4 des Überdruckventils 1. Die Dichtfläche 4 ist dabei eine ebene Fläche. In der Dichtfläche 4 sind zwei Durchgangsöffnungen 51, 52 ausgebildet, welche sich jeweils durch den Dichtbereich 20 des Grundkörpers 2 erstrecken. Die beiden Durchgangsöffnungen 51, 52 sind dabei exzentrisch und symmetrisch zur Mittelachse 21 des Grundkörpers 2 ausgebildet, wie auch in der Figur 2 zu sehen.A surface of the sealing area 20 facing the inner volume V forms a sealing surface 4 of the pressure relief valve 1. The sealing surface 4 is a flat surface. Two through openings 51 , 52 are formed in the sealing surface 4 and each extend through the sealing region 20 of the base body 2 . The two through openings 51, 52 are formed eccentrically and symmetrically to the central axis 21 of the base body 2, as well as in FIG figure 2 to see.

Die erste Membran 6 ist so am Grundkörper 2 angeordnet, dass diese die Dichtfläche 4 teilweise überdeckt. Dabei ist die erste Membran 6 über den beiden Durchgangsöffnung 51, 52 angeordnet und überdeckt diese. Die zweite Membran 7 ist so angeordnet, dass diese die erste Membran 6 überdeckt.The first membrane 6 is arranged on the base body 2 in such a way that it partially covers the sealing surface 4 . The first membrane 6 is arranged over the two through openings 51, 52 and covers them. The second membrane 7 is arranged in such a way that it covers the first membrane 6 .

Weiterhin ist auf der Dichtfläche 4 ein Fluid 8, welches hier ein Silikonöl ist, aufgebracht. Das Fluid 8 ist auch zwischen der ersten Membran 6 und der zweiten Membran 7 angeordnet. Mittels des Fluids 8 sind die erste Membran 6 und die zweite Membran 7 schwimmend auf der Dichtfläche 4 gehalten, um die Dichtwirkung des Überdruckventils 1 zu bewirken. Durch den Kapillareffekt ist das Fluid 8 gleichmäßig zwischen der ersten Membran 6 und der zweiten Membran 7 verteilt. Das Fluid 8 sorgt dabei durch Adhäsion zwischen Dichtfläche 4 und erster Membran 6 dafür, dass die erste Membran 6 mittels einer Adhäsionskraft auf der Dichtfläche 4 gehalten wird und dadurch die Abdichtung bewirkt, also ein Eindringen von Luft aus der Umgebung U in den Innenraum I des Verpackungsbehälters 100 verhindert.Furthermore, a fluid 8 , which is a silicone oil here, is applied to the sealing surface 4 . The fluid 8 is also arranged between the first membrane 6 and the second membrane 7 . The first membrane 6 and the second membrane 7 are held floating on the sealing surface 4 by means of the fluid 8 in order to bring about the sealing effect of the pressure relief valve 1 . The fluid 8 is evenly distributed between the first membrane 6 and the second membrane 7 by the capillary effect. Through adhesion between the sealing surface 4 and the first membrane 6, the fluid 8 ensures that the first membrane 6 is held on the sealing surface 4 by means of an adhesive force and thus causes the seal, i.e. air to penetrate from the environment U into the interior I of the Packaging container 100 prevented.

Das Fluid 8 bewirkt außerdem eine schwimmende Anordnung der beiden Membranen 6, 7 auf der Dichtfläche 4. Das heißt, die erste Membran 6 sowie die zweite Membran 7 sind in lateraler Richtung Azur Mittelachse 21 beweglich auf der Dichtfläche 4 angeordnet. Somit bilden die beiden Membranen 6, 7 zusammen mit dem Fluid 8 eine bewegliche Dichtanordnung, welche ein schnelles und zuverlässiges Ansprechen beim Wechsel zwischen Öffnen und Schließen des Überdruckventils 1 ermöglicht.The fluid 8 also causes the two membranes 6 , 7 to float on the sealing surface 4 . This means that the first membrane 6 and the second membrane 7 are arranged on the sealing surface 4 so that they can move in the lateral direction along the central axis 21 . Thus, the two membranes 6, 7 together with the fluid 8 form a movable sealing arrangement, which enables a quick and reliable response when changing between opening and closing the pressure relief valve 1.

Tritt durch Ausgasen von verpackten Produkten ein Überdruck im Innenraum I des Verpackungsbehälters 100 auf, so kann Gas durch das Überdruckventil 1 nach außen an die Umgebung U ausströmen. Hierfür bildet sich ein Gaskanal im Überdruckventil 1, der sich von einer oder beiden der Durchgangsöffnungen durch das Fluid 8 erstreckt und die erste Membran 6 dabei an dessen Rand geringfügig von der Dichtfläche 4 abhebt. Durch diesen Gaskanal und über die Löcher 12, 13 kann das Gas an die Umgebung U ausströmen, wodurch ein Druckausgleich herbeigeführt wird.If overpressure occurs in the interior I of the packaging container 100 due to outgassing of packaged products, gas can flow out through the pressure relief valve 1 to the environment U. For this purpose, a gas channel is formed in the overpressure valve 1, which extends from one or both of the passage openings through the fluid 8 and the first membrane 6 is slightly lifted off the sealing surface 4 at its edge. The gas can flow out to the environment U through this gas channel and via the holes 12, 13, as a result of which a pressure equalization is brought about.

Sobald der Druck ausreichend ausgeglichen ist, wird der Gaskanal durch das Fluid 8 wieder geschlossen und die erste Membran 6 wird durch die Adhäsionskraft des Fluids 8 wieder zurück Richtung Dichtfläche 4 gezogen, sodass das Überdrückventil 1 wieder abdichtet. Die zweite Membran 7 unterstützt dieses Wiederverschließen zusätzlich. Insbesondere bewirkt die zweite Membran 7 eine gewisse Vorspannung, welche eine Rückstellung der ersten Membran 6 zurück in ihre Ausgangsstellung begünstigt. Zudem bewirkt der Kapillareffekt dabei, dass das Fluid 8 sich gleichmäßig um die erste Membran 6 herum verteilt, also begünstigt weiter, dass sich die erste Membran 6 zurück in Ihre Ausgangsform verformt.As soon as the pressure is sufficiently balanced, the gas channel is closed again by the fluid 8 and the first membrane 6 is pulled back towards the sealing surface 4 by the adhesive force of the fluid 8 so that the pressure relief valve 1 seals again. The second membrane 7 additionally supports this reclosing. In particular, the second membrane 7 brings about a certain pretension, which promotes a return of the first membrane 6 back into its initial position. In addition, the capillary effect causes the fluid 8 to be distributed evenly around the first membrane 6, ie it also promotes the first membrane 6 deforming back into its original shape.

Weiterhin sind die erste Membran 6 und die zweite Membran 7 jeweils als kreisförmige Folienscheiben ausgebildet, wie insbesondere auch in der Figur 2 zu erkennen. Die Figur 2 zeigt dabei eine Draufsicht des Überdruckventils 1 der Figur 1, wobei der Verpackungsbehälter nicht dargestellt ist. Wie in der Figur 2 zu erkennen, sind die erste Membran 6, die zweite Membran 7 und der Grundkörper 2 jeweils mit einem kreisförmigen Querschnitt ausgebildet und, im hier dargestellten unverschobenen Zustand, konzentrisch zueinander angeordnet.Furthermore, the first membrane 6 and the second membrane 7 are each designed as circular foil discs, as in particular in FIG figure 2 to recognize. The figure 2 shows a top view of the pressure relief valve 1 of FIG figure 1 , wherein the packaging container is not shown. Like in the figure 2 can be seen, the first membrane 6, the second membrane 7 and the base body 2 are each formed with a circular cross-section and, in unshifted state shown here, arranged concentrically to each other.

Ein erster Durchmesser D1 der ersten Membran 6 ist um 5 % kleiner als ein zweiter Durchmesser D2 der zweiten Membran 7. Der zweite Durchmesser D2 ist außerdem 10% kleiner als ein Innendurchmesser D3 des Randbereichs 3 des Grundkörpers 2. Der Innendurchmesser D3 entspricht somit auch einem Außendurchmesser der Dichtfläche 4. Durch den im Vergleich zum zweiten Durchmesser D2 kleineren ersten Durchmesser D1 kann sich das Fluid 8 aufgrund des Kapillareffekts besonders einfach gleichmäßig zwischen der ersten Membran 6 und der zweiten Membran 7 verteilen, da das Fluid 8 leicht um einen Rand der ersten Membran 6 fließen kann. Die erste Membran 6 weist weiterhin eine erste Dicke B1 auf, welche gleich einer zweiten Dicke B2 der zweiten Membran 7 ist.A first diameter D1 of the first membrane 6 is 5% smaller than a second diameter D2 of the second membrane 7. The second diameter D2 is also 10% smaller than an inner diameter D3 of the edge area 3 of the base body 2. The inner diameter D3 therefore also corresponds to a Outer diameter of the sealing surface 4. Due to the first diameter D1, which is smaller than the second diameter D2, the fluid 8 can be distributed evenly between the first membrane 6 and the second membrane 7 particularly easily due to the capillary effect, since the fluid 8 easily flows around an edge of the first Membrane 6 can flow. The first membrane 6 also has a first thickness B1 which is equal to a second thickness B2 of the second membrane 7 .

Für eine optimale Funktion des Überdruckventils 1 sind der erste Durchmesser D1 und die Positionen der beiden Durchgangsöffnungen 51, 52 so aufeinander abgestimmt, dass die erste Membran 6 auch bei maximaler lateraler Verschiebung auf der Dichtfläche 4 noch beide Durchgangsöffnungen 51, 52 vollständig überdeckt. Das heißt, auch wenn die erste Membran 6 so weit in lateraler Richtung A verschoben ist, dass diese am Randbereich 3 anliegt, ist noch immer jede der Durchgangsöffnungen 51, 52 von der ersten Membran 6 vollständig überdeckt.For optimal functioning of the pressure relief valve 1, the first diameter D1 and the positions of the two through-openings 51, 52 are matched to one another in such a way that the first membrane 6 still completely covers both through-openings 51, 52 even with maximum lateral displacement on the sealing surface 4. This means that even if the first membrane 6 is displaced so far in the lateral direction A that it is in contact with the edge area 3 , each of the through-openings 51 , 52 is still completely covered by the first membrane 6 .

Ein Fluidvolumen des Fluids 8 steht in einem Verhältnis von 3:100 zu dem Innenvolumen V des Grundkörpers 2. Dadurch wird sichergestellt, dass ein ausreichendes Fluidvolumen zur Verfügung steht, um mittels der Adhäsionskraft schließlich die Haftung der ersten Membran 6 auf der Dichtfläche 4 und somit für die Dichtwirkung zu erzielen. Zudem wird durch dieses Verhältnis auch sichergestellt, dass kein überflüssiges Fluidvolumen vorliegt, was sich negativ auf eine gezielte, zuverlässige Adhäsion der ersten Membran 6 auf der Dichtfläche 4 und der zweiten Membran 7 auf der ersten Membran 6 auswirken könnte.A fluid volume of the fluid 8 is in a ratio of 3:100 to the internal volume V of the base body 2. This ensures that a sufficient fluid volume is available to finally ensure the adhesion of the first membrane 6 to the sealing surface 4 and thus to achieve the sealing effect. In addition, this ratio also ensures that there is no superfluous fluid volume, which could have a negative effect on targeted, reliable adhesion of the first membrane 6 to the sealing surface 4 and of the second membrane 7 to the first membrane 6 .

Die Figur 3 zeigt eine vereinfachte schematische Schnittansicht eines Überdruckventils 1 gemäß einem zweiten Ausführungsbeispiel der Erfindung.The figure 3 shows a simplified schematic sectional view of a pressure relief valve 1 according to a second embodiment of the invention.

Das zweite Ausführungsbeispiel entspricht dabei im Wesentlichen dem ersten Ausführungsbeispiel in den Figuren 1 und 2 wobei die beiden Membranen 6', 7` andere Größenverhältnisse relativ zueinander aufweisen.The second embodiment essentially corresponds to the first embodiment in FIGS Figures 1 and 2 the two membranes 6', 7` having different proportions relative to one another.

Im zweiten Ausführungsbeispiel in der Figur 3 sind der erste Durchmesser D1' der ersten Membran 6' und der zweite Durchmesser D2' der zweiten Membran 7` identisch. Weiterhin ist die zweite Dicke B2' der zweiten Membran 7` im zweiten Ausführungsbeispiel viermal so groß, wie die erste Dicke B1' der ersten Membran 6`. In anderen Worten liegt ein Dickenverhältnis der ersten Membran 6' zur zweiten Membran 7` von 1:4 vor. Dadurch ist die zweite Membran 7` deutlich starrer als die erste Membran 6' und es kann eine stabilere Anordnung der beiden Membranen 6', 7` erreicht werden. Dadurch kann erreicht werden, dass das Überdruckventil 1 im Vergleich zum ersten Ausführungsbeispiel später, also bei einem höheren Überdruck im Innenraum I gegenüber der Umgebung U, öffnet, da ein größerer Widerstand überwunden werden muss, bis die erste Membran 6' von der Dichtfläche 4 abhebt. Zudem schließt das Überdruckventil 1 noch schneller, da die zweite Membran 7` eine höhere Rückstellkraft bewirkt.In the second embodiment in the figure 3 the first diameter D1' of the first membrane 6' and the second diameter D2' of the second membrane 7` are identical. Furthermore, the second thickness B2' of the second membrane 7` in the second exemplary embodiment is four times greater than the first thickness B1' of the first membrane 6`. In other words, there is a thickness ratio of the first membrane 6' to the second membrane 7` of 1:4. As a result, the second membrane 7' is significantly more rigid than the first membrane 6' and a more stable arrangement of the two membranes 6', 7' can be achieved. As a result, the pressure relief valve 1 opens later than in the first exemplary embodiment, i.e. at a higher overpressure in the interior I compared to the environment U, since a greater resistance has to be overcome before the first membrane 6′ lifts off the sealing surface 4 . In addition, the pressure relief valve 1 closes even more quickly, since the second membrane 7` causes a higher restoring force.

Die Figur 4 zeigt eine vereinfachte schematische Schnittansicht eines Überdruckventils 1 gemäß einem dritten Ausführungsbeispiel der Erfindung. Das dritte Ausführungsbeispiel entspricht dabei im Wesentlichen dem ersten Ausführungsbeispiel in den Figuren 1 und 2 wobei zusätzlich eine dritte Membran 9 vorgesehen ist, welche zwischen der ersten Membran 6 und der zweiten Membran 7 angeordnet ist. Die dritte Membran 9 weist einen dritten Durchmesser D4 auf, welcher gleich dem ersten Durchmesser D1 der ersten Membran 6 ist. Das Fluid 8 ist durch den Kapillareffekt gleichmäßig zwischen allen drei Membranen 6, 7, 9 sowie zwischen der ersten Membran 6 und der Dichtfläche 4 verteilt. Die dritte Membran 9 begünstigt dabei die Beweglichkeit der schwimmenden Membrananordnung weiter und sorgt somit für eine weiter optimierte Dichtwirkung des Überdruckventils 1, insbesondere hinsichtlich Öffnen und Schließen zum bzw. nach dem Ausgleich eines Überdrucks im Innenraum I des Verpackungsbehälters 100.The figure 4 shows a simplified schematic sectional view of a pressure relief valve 1 according to a third embodiment of the invention. The third exemplary embodiment essentially corresponds to the first exemplary embodiment in FIGS Figures 1 and 2 a third membrane 9 is additionally provided, which is arranged between the first membrane 6 and the second membrane 7 . The third membrane 9 has a third diameter D4 which is equal to the first diameter D1 of the first membrane 6 . The fluid 8 is evenly distributed between all three membranes 6, 7, 9 and between the first membrane 6 and the sealing surface 4 by the capillary effect. The third membrane 9 further promotes the mobility of the floating membrane arrangement and thus ensures a further optimized sealing effect of the pressure relief valve 1, in particular with regard to opening and closing for or after the equalization of an overpressure in the interior I of the packaging container 100.

Claims (13)

  1. Pressure relief valve for a packaging container, comprising:
    - a base body (2) with an edge region (3) and with a sealing surface (4), wherein the edge region (3) is connectable in sealing fashion to a wall (10) of a packaging container (100) and wherein the sealing surface (4) surrounds at least one pass-through opening (51) which extends through the base body (2),
    - a first membrane (6), which is arranged over the pass-through opening (51) and covers the sealing surface (4) at least partially,
    - a second membrane (7), which covers the first membrane (6) at least partially, and
    - a fluid (8), which is applied onto the sealing surface (4), the fluid (8) being arranged between the sealing surface (4) and the first membrane (6), characterised in that
    - by means of the fluid (8) the first membrane (6) is held afloat on the sealing surface (4) and the second membrane (7) is held afloat on the first membrane (6), wherein the fluid (8) induces a lateral mobility of the first membrane (6) and of the second membrane (7) on the sealing surface (4) and within the edge region (3).
  2. Pressure relief valve according to claim 1,
    wherein the fluid (8) is arranged, in each case completely, between the first membrane (6) and the sealing surface (4) and between the first membrane (6) and the second membrane (7).
  3. Pressure relief valve according to one of the preceding claims,
    wherein the first membrane (6) has a first outer dimension (D1) in a plane parallel to the sealing surface (4),
    wherein the second membrane (7) has a second outer dimension (D2) in a plane parallel to the sealing surface (4),
    the first outer dimension (D1) being smaller than or equal to the second outer dimension (D2).
  4. Pressure relief valve according to claim 3,
    wherein the first outer dimension (D1) and a position of the at least one pass-through opening (51) in the sealing surface (4) are adapted to each other such that the first membrane (6) covers the at least one pass-through opening (51) completely, with any lateral displacement of the first membrane (6) on the sealing surface (4).
  5. Pressure relief valve according to one of the preceding claims,
    wherein a thickness ratio of a first thickness (B1) of the first membrane (6) to a second thickness (B2) of the second membrane (7) is between 1:1 and 1:10, in particular between 1:2 and 1:6, particularly preferably 1:4.
  6. Pressure relief valve according to one of the preceding claims,
    wherein a ratio of a fluid volume of the fluid to an inner volume (V) of the base body (2) is at least 3:100, in particular at least 5:100 and preferentially at most 3:10.
  7. Pressure relief valve according to one of the preceding claims,
    wherein two pass-through openings (51, 52) are realized in the base body (2), and wherein the two pass-through openings (51, 52) are arranged in off-centre and symmetric fashion with respect to a middle axis (21) of the base body (2).
  8. Pressure relief valve according to one of the preceding claims,
    wherein the first membrane (6) and the second membrane (7) are respectively embodied as circle-shaped film discs.
  9. Pressure relief valve according to one of the preceding claims,
    wherein the first membrane (6) has a higher flexibility than the second membrane (7).
  10. Pressure relief valve according to one of the preceding claims,
    wherein the base body (2) has a round cross-section shape.
  11. Pressure relief valve according to one of the preceding claims,
    comprising at least one third membrane (9), which is arranged between the first membrane (6) and the second membrane (7).
  12. Pressure relief valve according to one of the preceding claims,
    wherein the base body (2) is an injection-moulded part and is in particular made of a synthetic material.
  13. Packaging container, comprising at least one pressure relief valve (1) according to one of the preceding claims.
EP19197913.7A 2019-01-24 2019-09-18 Pressure relief valve with floating membrane and packaging container Active EP3686125B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102019200860.7A DE102019200860A1 (en) 2019-01-24 2019-01-24 Pressure relief valve with a floating membrane

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EP3686125A1 EP3686125A1 (en) 2020-07-29
EP3686125B1 true EP3686125B1 (en) 2023-08-30

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US (1) US11155395B2 (en)
EP (1) EP3686125B1 (en)
DE (1) DE102019200860A1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102019214315A1 (en) * 2019-09-19 2021-03-25 Syntegon Technology Gmbh Valve for a packaging container

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1251758A (en) * 1917-02-24 1918-01-01 Frederick M Dayton Toy-balloon valve.
IT1248238B (en) * 1991-06-18 1995-01-05 Ica Spa BREATHER VALVE.
DE102004062026A1 (en) * 2004-09-29 2006-03-30 Robert Bosch Gmbh Pressure relief valve for a packaging container
WO2006084402A1 (en) * 2005-02-10 2006-08-17 Karl Keller Method for preserving foodstuffs
US8925579B2 (en) * 2006-03-02 2015-01-06 Pacific Bag, Inc. Pressure relief valve
US20090026199A1 (en) * 2007-07-27 2009-01-29 Jeor Bret De Pressure vacuum release hermetic valve for rigid container packages
DE102009000802A1 (en) 2009-02-12 2010-08-19 Robert Bosch Gmbh Pressure relief valve for a packaging container
US20120243807A1 (en) * 2011-03-25 2012-09-27 Pascoe Gregory A Gas exhaust valve for packages
WO2017148754A1 (en) * 2016-02-29 2017-09-08 BRINKE, Volker Relief valve for a food pack, and food pack

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DE102019200860A1 (en) 2020-07-30
EP3686125A1 (en) 2020-07-29
US20200239214A1 (en) 2020-07-30
US11155395B2 (en) 2021-10-26

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