EP0209729B1 - Récipient d'emballage muni d'une valve de surpression - Google Patents

Récipient d'emballage muni d'une valve de surpression Download PDF

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Publication number
EP0209729B1
EP0209729B1 EP86108375A EP86108375A EP0209729B1 EP 0209729 B1 EP0209729 B1 EP 0209729B1 EP 86108375 A EP86108375 A EP 86108375A EP 86108375 A EP86108375 A EP 86108375A EP 0209729 B1 EP0209729 B1 EP 0209729B1
Authority
EP
European Patent Office
Prior art keywords
packaging container
wall
membrane
container according
pressure
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
EP86108375A
Other languages
German (de)
English (en)
Other versions
EP0209729A2 (fr
EP0209729A3 (en
Inventor
Norbert Prof. Dr. Buchner
Klaus Dr.-Ing. Domke
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.)
OFFERTA DI LICENZA AL PUBBLICO
Original Assignee
Robert Bosch GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP0209729A2 publication Critical patent/EP0209729A2/fr
Publication of EP0209729A3 publication Critical patent/EP0209729A3/de
Application granted granted Critical
Publication of EP0209729B1 publication Critical patent/EP0209729B1/fr
Expired legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D43/00—Lids or covers for rigid or semi-rigid containers
    • B65D43/02—Removable lids or covers
    • B65D43/0202—Removable lids or covers without integral tamper element
    • B65D43/0214—Removable lids or covers without integral tamper element secured only by friction or gravity
    • B65D43/0218—Removable lids or covers without integral tamper element secured only by friction or gravity on both the inside and the outside of the mouth of the container
    • 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 invention relates to a packaging container with a pressure relief valve according to the preamble of claim 1.
  • a packaging container of this type known for example from US-A-4 051 973
  • the strip-shaped membrane spans an outwardly curved part of the lid of the container in which the Passage opening is arranged.
  • the membrane is fastened to the curvature of the lid with two opposite edge regions, the middle, free part delimiting a channel which is expanded in the interior of the container in the event of overpressure and is closed in the case of constant or negative pressure.
  • the relatively large passage opening forms a large pressure application area for the membrane; through them, however, filler particles can get into the channel and settle there, so that a complete contact of the membrane on the container wall is prevented after the pressure has decreased.
  • Air cannulas and microbes can get into the interior of the container through cannulas thus formed and spoil the packaged goods. Since the membrane has to conform to the shape of the wall to seal and to expand by releasing it to release the pressure, it is made of an elastic material. In order to stretch the membrane so far that its central part lifts off the container wall, a large excess pressure is required, which the entire container must withstand.
  • a packaging container is known from US-A-2 927 722, in which the walls are formed from a flexible packaging material and the membrane forming the valve member is fastened thereon via a passage opening with a relatively large cross-section.
  • This arrangement has the disadvantage that in the case of a package containing granular or powdery particles, for example ground coffee, good particles can pass through the passage opening into the degassing channel and can get caught there, so that a tight closing of the valve is no longer possible.
  • it is disadvantageous in the case of non-rigid contents of the container that the initially flat wall of the packaging container is deformed by the displacement of particles of the contents, with the result that stresses occur in the free part of the membrane covering the channel, by which the valve only opens when high internal pressure is possible. In this case, the package is deformed unsightly, so that the consumer suspects a spoiled product.
  • a pressure relief valve for a packaging container has become known, for example, from EP-A-23 703, in which a membrane forming the valve member on an annular base part made of relatively rigid material is attached.
  • the base part carrying the membrane is firmly glued to the container wall and prevents the membrane from deforming when the container walls are deformed.
  • the packaging container according to the invention with the characterizing features of claim 1 asked the advantage that when a stiff, flat packing wall and a simple valve membrane are arranged, opening of the pressure relief valve is already guaranteed at a certain, low overpressure in the package, since the indentation means that A pressure effective area is created through the passage opening, which is decisive for the opening pressure.
  • a simple design of the pressure relief valve a safe discharge of gas from the package is ensured even at a low pressure and a tight reclosing of the pressure relief valve when the pressure drops to a certain level.
  • FIG. 1 shows a packaging container with a pressure relief valve in a diagrammatic representation
  • FIG. 2 shows the cross section of the head region of the packaging container according to FIG. 1.
  • the packaging container consists of a tubular or sleeve-shaped body 1 and of two covers 2, 3 closing its openings. It is water-vapor and gas-tight and is particularly suitable for holding air and moisture-sensitive food and beverages.
  • the body 1 of the packaging container is formed from a multilayer packaging material which has a weldable, thermoplastic layer on the inside.
  • the fuselage 1 has a square cross section with rounded corners; however, its cross-sectional shape can also be circular, oval, rectangular or polygonal, the corners being arcuate.
  • the two covers 2, 3 which close the openings of the fuselage 1 have a flat wall 5 and a U-shaped folded edge 6 which delimits them and which is adapted to the cross-sectional shape of the fuselage 1 and which engages around the ends of the fuselage 1 and seals them tightly with their inside and outside is.
  • the lids 2, 3 are by deep drawing or deep drawing a multi-layer, relatively stiff packaging material sheet, which also carries a weldable, thermoplastic layer on the inside.
  • the cover and the body material preferably also have a layer which acts as a gas and water vapor barrier, for example made of aluminum.
  • a pressure relief valve 10 In order to prevent air from the environment from penetrating into the interior of the container on the one hand, so that the oxygen-sensitive material spoils, and on the other hand the gas released by the packaged material, for example freshly roasted coffee, kefir, yogurt, etc., can escape from the interior of the container without the container deforming or even bursting, it is equipped with a pressure relief valve 10.
  • This pressure relief valve 10 is preferably arranged on the head cover 2 on its flat wall 5, so that the upwardly protruding folded edge 6 protects against external pressure from adjacent packs or other objects.
  • the pressure relief valve 10 has a membrane 11 made of a flexible, 30 ⁇ m thick plastic film.
  • the membrane 11 preferably has a circular area, but this can also be square with rounded corners.
  • the membrane 11 lies on the wall 5 of the lid 2 and closes a passage opening 12 in the wall of the lid 2. It is fastened by means of two parallel adhesive strips 13 in mutually opposite edge zones on the top of the lid 2.
  • the passage opening 12 in the wall 5 of the lid 2 has a relatively small width, so that gas, but no particles of the filling material can pass through. It is preferably made by inserting a slot.
  • the flat wall 5 of the cover 2 is dented around the passage opening 12 towards the inside of the packaging container.
  • the indentation 16 has the shape of a spherical cap or a cone.
  • the width of the indentation 16 at its root corresponds approximately to the width of the channel 14 or the distance between the two adhesive strips 13; depending on the desired opening pressure of the pressure relief valve 10, it is in a range between 5 and 10 mm.
  • the greatest depth of the indentation 16 is approximately 0.5 to 1 mm.
  • a liquid sealant for example silicone oil, is introduced therein.
  • a material is selected for the membrane 11, the thermal expansion coefficient of which is approximately equal to that of the material of the cover 2.
  • the pressure relief valve described acts as follows: Through the passage opening 12 in the wall 5 of the cover 2, the pressure prevailing in the interior of the packaging container acts on the surface of the membrane 11 which coincides with the indentation 16. At a pressure of approximately 5 mbar, the mean, zone 14 of membrane 11 covering channel 14, so that channel 14 widens and gas can flow from inside the packing through the channel. After releasing a certain amount of gas and the associated pressure reduction in the interior of the packaging container, the central zone of the membrane 11 covering the channel 14 rests on the top of the wall 5, and the liquid film formed by the sealant also closes the pressure relief valve 10 in a gas-tight manner.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Closures For Containers (AREA)
  • Packages (AREA)
  • Details Of Rigid Or Semi-Rigid Containers (AREA)

Claims (6)

1. Réceptacle d'emballage muni d'une soupape de surpression (10) proprement dite en forme de membrane souple (11) qui est fixée sur une paroi rigide (5) du réceptacle d'emballage (1) au niveau des zones marginales (13) en regard l'une de l'autre et qui délimitent le canal, en fermant un orifice de passage (12) et limitant un canal d'évacuation de gaz (14), caractérisé en ce que l'orifice de passage (12) a une section permettant le passage du gaz mais d'aucune particule de produit de remplissage et la zone (16) de la paroi (5) qui entoure directement l'orifice de passage (12) du réceptacle d'emballage est déformée en creux.
2. Réceptacle d'emballage selon la revendication 1, caractérisé en ce que la largeur de la zone déformée en creux (16) correspond à la largeur du canal (14).
3. Réceptacle d'emballage selon la revendication 2, caractérisé en ce que la zone déformée en creux (16) a la forme d'un cône ou d'une calotte sphérique.
4. Réceptacle d'emballage selon l'une des revendications 1 à 3, caractérisé en ce que la membrane (11) est fixée par deux bandes parallèles de colle (13) contre la paroi (5) du réceptacle d'emballage.
5. Réceptacle d'emballage selon l'une des revendications 1 à 4, caractérisé en ce que l'orifice de passage (12) dans la paroi (5) est une entaille.
6. Réceptacle d'emballage selon l'une des revendications 1 à 5, caractérisé en ce que la paroi rigide (5) qui est munie de la soupape de surpression (10) présente un bord périphérique (6) en saillie.
EP86108375A 1985-07-25 1986-06-19 Récipient d'emballage muni d'une valve de surpression Expired EP0209729B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3526586 1985-07-25
DE19853526586 DE3526586A1 (de) 1985-07-25 1985-07-25 Verpackungsbehaelter mit rberdruckventil

Publications (3)

Publication Number Publication Date
EP0209729A2 EP0209729A2 (fr) 1987-01-28
EP0209729A3 EP0209729A3 (en) 1988-02-10
EP0209729B1 true EP0209729B1 (fr) 1989-12-06

Family

ID=6276712

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86108375A Expired EP0209729B1 (fr) 1985-07-25 1986-06-19 Récipient d'emballage muni d'une valve de surpression

Country Status (5)

Country Link
US (1) US4653661A (fr)
EP (1) EP0209729B1 (fr)
JP (1) JP2517554B2 (fr)
DE (2) DE3526586A1 (fr)
ES (1) ES2000565A6 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106864973A (zh) * 2016-08-08 2017-06-20 株式会社乐扣乐扣 食品容器

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CN106864973B (zh) * 2016-08-08 2020-07-14 株式会社乐扣乐扣 食品容器

Also Published As

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JP2517554B2 (ja) 1996-07-24
JPS6333255A (ja) 1988-02-12
DE3667264D1 (de) 1990-01-11
DE3526586A1 (de) 1987-02-05
ES2000565A6 (es) 1988-03-01
US4653661A (en) 1987-03-31
EP0209729A2 (fr) 1987-01-28
EP0209729A3 (en) 1988-02-10

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