EP2396243B1 - Überdruckventil für einen verpackungsbehälter - Google Patents

Überdruckventil für einen verpackungsbehälter Download PDF

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Publication number
EP2396243B1
EP2396243B1 EP10700323.8A EP10700323A EP2396243B1 EP 2396243 B1 EP2396243 B1 EP 2396243B1 EP 10700323 A EP10700323 A EP 10700323A EP 2396243 B1 EP2396243 B1 EP 2396243B1
Authority
EP
European Patent Office
Prior art keywords
relief valve
pressure
diaphragm
main body
valve according
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
EP10700323.8A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP2396243A1 (de
Inventor
Hans-Peter Stadel
Herbert Stotkiewitz
Juergen Haak
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.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
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Filing date
Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP2396243A1 publication Critical patent/EP2396243A1/de
Application granted granted Critical
Publication of EP2396243B1 publication Critical patent/EP2396243B1/de
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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
    • 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 with significantly improved sealing properties.
  • valves for packaging containers are known from the prior art in various configurations.
  • the use of valves, in particular flexible packaging for food, is already realized by a variety of technical variants.
  • a main requirement of such valves is that they allow only small excess pressures in the packaging by appropriate opening and otherwise reliably prevent the ingress of ambient air. The penetration of ambient air must be prevented even at very low pressures that are well below the ambient pressure in the packaging.
  • the two objectives mentioned above are opposite to each other, since on the one hand only a small opening pressure to open the valve should be present and on the other hand, a high vacuum resistance to be provided. Therefore, valves that have high vacuum resistance also have a very high opening pressure. In contrast, valves with only a small opening pressure do not have the necessary vacuum resistance.
  • the US 5 992 442 A discloses a pressure relief valve for packaging containers with a base body and a flexible deformable valve membrane.
  • the pressure relief valve according to the invention with the features of claim 1 has the advantage that it opens even at very small pressures above the ambient pressure of less than 1000 Pa (10 mbar), in particular less than 500 Pa (5 mbar) and a very high vacuum resistance at a pressure difference of over 60000 Pa (600 mbar).
  • the pressures can be well below the ambient pressure.
  • the pressure relief valve comprises a base body having a through hole and a sealing surface and a membrane resting on the sealing surface.
  • the sealing surface has an inwardly tapering shape and between the membrane and the sealing surface is a thin fluid layer, in particular silicone oil arranged.
  • the membrane is flexible and has a deformable, i.e., soft, surface facing the sealing surface.
  • an inner annular groove is arranged on the main body radially inside the sealing surface, so that an inner edge is formed at the transition between the inner annular groove and the sealing surface.
  • the soft surface of the membrane makes it possible for the seal to deform the surface of the membrane and thus contribute to an improved sealing on the sealing surface.
  • the tapered sealing surface promotes the formation of a fluid film of different thickness, such that on a radially outer side of the sealing surface of the fluid film is thinner than on a radially inner side. This results in different adhesion forces and capillary forces, which on the radially inner side allow easier opening at overpressure (smaller forces due to larger fluid film thickness) and provide on the radially outer side for improved vacuum resistance (larger forces due to smaller fluid film thickness).
  • the sealing performance at a very low vacuum in the package is improved, and at the same time, the openability is not deteriorated in the presence of a very small overpressure of less than 500 Pa.
  • the sealing surface terminates with an inner edge at which the soft surface of the membrane can be compressed particularly well.
  • the deformable surface disposed on the membrane is formed by a separate layer on a flexible membrane material.
  • a soft surface can be achieved by the separate layer and the other membrane material can be made flexible and still have a certain rigidity and elasticity.
  • the entire membrane may be made of a material which ensures a soft surface of the membrane.
  • a plurality of radially inwardly projecting lugs are arranged on the base body, wherein the lugs center the membrane between them.
  • the base body comprises a plurality of retaining projections, which are integrally formed on the base body.
  • the holding projections prevent falling out of the membrane. As a result, it is possible in particular to dispense with a separate hold-down part for the membrane.
  • a circumferential groove in the base body is provided radially outside the sealing surface, so that an outer edge of the sealing surface is formed, on which the soft membrane surface seals securely.
  • the deformable surface of the membrane or the entire membrane is made of EPDM (ethylene-propylene-diene rubber) or NBR (nitrile-butadiene rubber) or silicone rubber.
  • EPDM ethylene-propylene-diene rubber
  • NBR nitrile-butadiene rubber
  • the pressure relief valve further comprises a filter element, which is arranged at the passage opening.
  • the filter element is preferably arranged on a side of the base body directed towards the inside of the packaging.
  • a multiplicity of microperforations can also be provided, which together form the passage opening. In this case, however, a diameter of the micro perforation must be smaller than an average diameter of the packaged goods in order to prevent the packaged good passes through the micro perforations in the pressure relief valve.
  • the base body has an edge region, which is designed to fix the pressure relief valve on an inner side of a package.
  • the edge region comprises an inner ring, an outer ring and a middle ring, wherein the center ring protrudes further from a base surface than the inner ring and the outer ring.
  • FIGS. 1 to 5 a pressure relief valve 1 according to a first preferred embodiment of the invention described in detail.
  • the pressure relief valve 1 comprises a base body 4 and a membrane 6.
  • the pressure relief valve 1 is fixed to an inner side 3a of a package 3.
  • openings 3b are provided, under which the pressure relief valve 1 is attached.
  • an interior of the package 3 is identified by the reference numeral 2 and an outside of the package (environment) by the reference numeral 11 denotes.
  • the overpressure valve 1 has the task of delivering an optionally occurring in the package 3 overpressure to the outside 11 and to seal an optionally prevailing in the package 3 vacuum against the outside 11.
  • Such packages with pressure relief valve are used for example for coffee.
  • the base body 4 is cylindrical with a relatively small height and includes an edge region 18 and an enclosed by the edge region recess 23.
  • the base body 4 has a sealing surface 14 and a central base region 24.
  • a plurality of passage openings 9 are provided in the main body 4, through which a gas from the interior 2 to the outside 11 can flow.
  • the sealing surface 14 on the base body is formed such that it tapers towards the inside. This taper can be conical or alternatively arched or dome-shaped. Due to the inward taper of the sealing surface 14 is an outer edge 15 of the sealing surface is always at a slightly higher level than an inner edge 16 of the sealing surface.
  • higher level is meant that the outer edge 15 is in a plane perpendicular to the central axis XX of the pressure relief valve 1, which is closer to the packaging wall closer to the packaging wall, as a plane perpendicular to the central axis XX through the inner edge sixteenth
  • the central base region 24 is also at a somewhat lower level than the inner edge 16. Furthermore, an outer annular groove 13 is provided radially outside the sealing surface 14 and radially inside the sealing surface 14 an inner annular groove 12. The two annular grooves 12, 13 are formed circumferentially, wherein the outer annular groove 13 is slightly deeper than the inner annular groove 12th
  • a plurality of radially inwardly directed lugs 17 are provided on a shoulder of the body. As in particular from Figures 2 and 4 it can be seen, the lugs 17 are formed such that they center the membrane 6 between them. Furthermore, three down holders 22 are integrally formed on the base body 4, which prevent the membrane 6 from being released from the base body 4 by mistake. This is particularly important in the assembly of the pressure relief valve 1 or when a high pressure from the interior 2 is discharged to the outside and the membrane 6 performs a relatively large movement.
  • the edge region 18 is formed by means of ultrasound for a simple sealing process.
  • the edge region 18 comprises an outer ring 20, a middle ring 19 and an inner ring 21.
  • the middle ring 19 protrudes further from a base surface 25 than the outer ring 20 and the inner ring 21.
  • FIG. 4 how out FIG. 4 it can be seen, three through holes 9 are provided in the central base region 24 in this embodiment, which are arranged distributed evenly in the circumferential direction.
  • the through holes 9 in this case have a same shape and are separated from each other by webs 10.
  • a flat recess 26 is provided on a side facing the interior 2 side 7 of the base body 4, in which a filter element 8 is received (see. FIG. 1 ).
  • the filter element 8 is preferably also fastened by means of ultrasonic welding to the base body 4, wherein in the recess an annular projection 8a (or an energy director) is provided. This allows a fast, clean ultrasound seal with high strength.
  • a thin fluid layer 5 is provided between the sealing surface 14 on the base body 4 and the membrane 6. If a pressure in the packaging 3 is above an ambient pressure on the outside 11, a force dependent on the sum of the cross sections of the through-openings 9 acts against the membrane 6. This force is counteracted by capillary and adhesive forces of the fluid layer, which in particular are of a thickness the fluid layer are dependent. These forces decrease with increasing fluid layer thickness.
  • the pressure relief valve 1 opens when the resulting pressure forces on the membrane 6 are greater than the capillary or adhesive forces that hold the membrane on the base body 4. Due to the tapered configuration of the sealing surface 14 is now causes a fluid layer thickness in the region of the inner edge 16 is greatest and the capillary forces in this area are thereby the smallest.
  • the pressure relief valve 1 makes it possible to open at comparatively low overpressures of ⁇ 500 Pa above the pressure on the outside 11.
  • FIG. 5 shows a state in which the membrane 6 is just lifted from the central base region 24, but still on the sealing surface 14th is applied.
  • the internal overpressure can press on the circular cross-sectional area of the membrane 6 exposed according to the inner edge 16, so that a significantly larger area exists compared to the initial state in which the internal pressure acts only on the three passage openings 9 on the membrane 6 is.
  • an opening operation of the membrane is further supported.
  • FIG. 1 and 5 it can be seen, a small gap to the base body 4 is present at the radially outer region of the membrane 6, then the overpressure in the space between the pressure relief valve 1 and the package 3 and from there via the openings 3b to the outside 11 can flow.
  • the membrane 6 is pressed both on the sealing surface 14 and on the central base region 24.
  • the membrane 6 additionally seals on the central base region 24.
  • the soft or deformable surface 6a of the membrane 6 in this case that a deformation of the surface 6a occurs, in particular in the region of the sealing surface 14 (cf. FIG. 5 ).
  • the membrane 6 is reinforced in particular in the region of the outer edge 15 by the inwardly conical shape of the sealing surface 14 reinforced deformed on the surface, so that in the region of the outer edge 15 only a very small fluid film thickness is present.
  • the fluid is thus present at the outer edge 15 with only a small fluid thickness and at the inner edge 16 with a slightly larger fluid thickness.
  • the very low fluid thickness in the region of the outer edge 15 thus causes a very high vacuum resistance of the pressure relief valve 1.
  • the soft or deformable surface of the membrane 6 according to the invention additionally supports the vacuum resistance of the valve, without this adversely affecting an opening characteristic with only slight differences in pressure between the inner space 2 and the outer side 11. Due to the tapering arrangement of the sealing surface 14, a stronger deformation at the outer edge 15 than at the inner edge 16 is additionally supported, which additionally increases the vacuum resistance.
  • FIG. 6 a pressure relief valve 1 according to a second embodiment of the invention described in detail. Identical or functionally identical parts are denoted by the same reference numerals as in the preceding embodiment.
  • the pressure relief valve 1 of the second embodiment substantially corresponds to that of the first embodiment, wherein in the second embodiment, the passage openings are designed differently from the first embodiment.
  • a plurality of small perforations 29 are provided, which are each formed in bases 27 in three recesses 28.
  • Each of the perforations 29 has a diameter of about 60 to 120 microns.
  • FIG. 7 shows a pressure relief valve 1 according to a third embodiment of the invention, wherein identical or functionally identical parts with the same reference numerals as in the preceding embodiments are designated.
  • a central recess 30 is provided in the third embodiment and the plurality of perforations 29 are formed in a base 31 of the central recess 30.
  • the perforations 29 are arranged at different radii evenly distributed along the circumferential direction. It should be noted, however, that it is also possible for the perforations to be irregular.
  • the third embodiment has only one annular surface 32 which separates the central recess 30 from the inner annular groove 12. This annular surface 32 thus corresponds to the central base region 24 in the preceding embodiments. Otherwise, this embodiment corresponds to the previous embodiments, so that reference can be made to the description given there.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Safety Valves (AREA)
EP10700323.8A 2009-02-12 2010-01-12 Überdruckventil für einen verpackungsbehälter Active EP2396243B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE200910000805 DE102009000805A1 (de) 2009-02-12 2009-02-12 Überdruckventil für einen Verpackungsbehälter
PCT/EP2010/050246 WO2010091910A1 (de) 2009-02-12 2010-01-12 Überdruckventil für einen verpackungsbehälter

Publications (2)

Publication Number Publication Date
EP2396243A1 EP2396243A1 (de) 2011-12-21
EP2396243B1 true EP2396243B1 (de) 2013-06-19

Family

ID=41697978

Family Applications (1)

Application Number Title Priority Date Filing Date
EP10700323.8A Active EP2396243B1 (de) 2009-02-12 2010-01-12 Überdruckventil für einen verpackungsbehälter

Country Status (3)

Country Link
EP (1) EP2396243B1 (un)
DE (1) DE102009000805A1 (un)
WO (1) WO2010091910A1 (un)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL2015219B1 (en) 2015-07-24 2017-02-08 Flexible Consulting B V One-way degassing valve.
IT202000005932A1 (it) 2020-03-19 2021-09-19 Aroma System S R L Valvola di degassificazione
IT202200004763A1 (it) * 2022-03-11 2023-09-11 Goglio Spa Valvola di degassazione per un contenitore ermetico

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1360753A (fr) * 1963-03-11 1964-05-15 Perfectionnement aux sachets et autres récipients analogues comportant une soupape en matière plastique
US4890637A (en) * 1988-12-12 1990-01-02 Flavorcoffee Co. Inc. One way valve
DE4129838A1 (de) * 1991-02-16 1992-08-20 Bosch Gmbh Robert Ueberdruckventil fuer verpackungsbehaelter
US5992442A (en) * 1997-05-29 1999-11-30 Urquhart; Edward F. Relief valve for use with hermetically sealed flexible container
DE19843430A1 (de) * 1998-09-22 2000-03-23 Wipf Ag Volketswil Staubdichter Beutel für feinpulvrige Produkte
DE20122507U1 (de) * 2001-08-21 2005-12-08 Robert Bosch Gmbh Überdruckventil für einen Verpackungsbehälter und Vorrichtung zum Anbringen des Überdruckventils an einer Materialbahn
US20070125430A1 (en) * 2003-10-16 2007-06-07 Murray R C Packaging release valve for microwavable food items
DE102004062026A1 (de) 2004-09-29 2006-03-30 Robert Bosch Gmbh Überdruckventil für einen Verpackungsbehälter
DE102004061262A1 (de) * 2004-12-20 2006-06-29 Robert Bosch Gmbh Überdruckventil für einen Verpackungsbehälter
DE102006016594A1 (de) * 2006-04-06 2007-10-18 Tesa Ag Überdruckventil für einen Verpackungsbehälter
ITBO20060856A1 (it) * 2006-12-15 2008-06-16 Aroma System Srl Valvola di sfiato unidirezionale di tipo piatto.

Also Published As

Publication number Publication date
DE102009000805A1 (de) 2010-08-19
EP2396243A1 (de) 2011-12-21
WO2010091910A1 (de) 2010-08-19

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