EP1481911A1 - Überdruckventil für Behälter für pulverförmige Produkte - Google Patents

Überdruckventil für Behälter für pulverförmige Produkte Download PDF

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Publication number
EP1481911A1
EP1481911A1 EP20030011804 EP03011804A EP1481911A1 EP 1481911 A1 EP1481911 A1 EP 1481911A1 EP 20030011804 EP20030011804 EP 20030011804 EP 03011804 A EP03011804 A EP 03011804A EP 1481911 A1 EP1481911 A1 EP 1481911A1
Authority
EP
European Patent Office
Prior art keywords
cardboard
layer
container
degassing valve
diaphragm
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.)
Withdrawn
Application number
EP20030011804
Other languages
English (en)
French (fr)
Inventor
Luigi Goglio
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.)
P L V SpA
Original Assignee
P L V SpA
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 P L V SpA filed Critical P L V SpA
Priority to EP20030011804 priority Critical patent/EP1481911A1/de
Publication of EP1481911A1 publication Critical patent/EP1481911A1/de
Withdrawn legal-status Critical Current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
    • B65D51/00—Closures not otherwise provided for
    • B65D51/16—Closures not otherwise provided for with means for venting air or gas
    • B65D51/1633—Closures not otherwise provided for with means for venting air or gas whereby venting occurs by automatic opening of the closure, container or other element
    • B65D51/1644—Closures not otherwise provided for with means for venting air or gas whereby venting occurs by automatic opening of the closure, container or other element the element being a valve
    • B65D51/165—Closures not otherwise provided for with means for venting air or gas whereby venting occurs by automatic opening of the closure, container or other element the element being a valve formed by a slit or narrow opening
    • 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 refers to a one-way degassing valve for cardboard containers, or containers having at least one cardboard wall, for powder products such as coffee and the like.
  • cardboard in the present description must be understood in its broadest sense, in that it can consist of a multilayer material, comprising one layer of cardboard, able to give a certain stiffness to the structure, and possibly other layers of sheet material.
  • One-way degassing valves which are normally applied to the top wall of a container, serve to allow the gases developed by the product to leave the container, avoiding the formation of internal overpressures, which would cause bulging and/or bursting of the container, and at the same time to prevent the entry of air into the container, which would prejudice the quality of the product.
  • Said valves open when overpressures occur inside the container and close again when said overpressures cease.
  • They normally comprise porous filters which retain the particles of coffee allowing the gas to pass through, and an impermeable diaphragm enclosed in a shell of rigid plastic, formed in at least two parts, a base and a cover.
  • valves are suitable in particular for containers in flexible material, to which they are welded, sealed or bonded.
  • the object of the invention is to eliminate the above drawbacks, in particular of to provide a one-way degassing valve for cardboard containers that is simple and cheap to make and has a minimal impact on the cost of the container.
  • Another object of the invention is to provide such a valve that does not involve substantial additions of parts to the container, but that can be made substantially with the same material as the container, without causing an appreciable increase in the thickness of the wall thereof.
  • Yet another object of the invention is to provide such a valve that is reliable in operation.
  • the valve according to the invention is formed directly on a cardboard wall of the container, normally the top wall, wherein an inner protrusion is formed, preferably annular in shape, coinciding with which a sealing diaphragm of impermeable material, held in place by an inner aluminium film bonded to the cardboard, is disposed.
  • Welding or bonding of the aluminium film to the cardboard involves such a surface as to leave free a central area wherein said sealing diaphragm is disposed and at least one track which, starting from said central area, reaches at least to a cut made in the cardboard wall.
  • the aluminium film in the area in which it covers the sealing diaphragm, and preferably in the centre thereof, there is provided a hole, which can be put into communication with the outside through the space which is created between the aluminium film and the impermeable diaphragm, a channel which is formed coinciding with said at least one track of non-bonding and said cut made in the cardboard.
  • a viscous or lubricating substance in particular a silicone oil, which involves at least one perimeter extending around said hole in the aluminium film.
  • the thin diaphragm which is kept in a state of elastic pretension because of the inside deformation of the cardboard, moistened with silicone oil, adheres to the aluminium film and prevents the entry of air into the container in the event of outside overpressure.
  • the degassing valve according to the invention finds an advantageous application in the cardboard container forming the subject matter of Italian patent application No. MI2001A 002635 of 31 December 2001, in the name of the same applicant, PLV S.p.A.
  • the top closure wall of the container has a closed cut line, to facilitate removal of a disk and form an opening for access to the product.
  • a thin aluminium film, which forms a seal and is torn along said cut line of the cardboard during removal of the disk, is applied to the inside of said wall.
  • the degassing valve according to the invention can easily be provided inside said disk.
  • reference numeral 1 denotes generally a cardboard container for containing products, for example, granular or powder products, such as coffee and the like, of the type described in the aforementioned Italian patent application No. MI2001A 002635.
  • top wall 2 has a peripheral edge 3 folded upwards at 90° around which an upper peripheral edge 4 of the side wall 5 of the container 1 is folded inward.
  • Said top wall 2 comprises an outer layer of cardboard 6, an intermediate layer of heat-bondable or heat-sealable material, such as polyethylene 7 and an inner film of aluminium 8, bonded to the cardboard layer 6.
  • a layer of polyethylene 9 is also applied to the inside of the side wall 5 of the container, at least in its top part, to allow bonding with the aluminium layer 8 of the folded edge 3 of the top wall 2.
  • a cut line 10 is provided in the cardboard layer 6 of the wall 2. The cut line 10 is closed and it extends substantially parallel to the octagonal perimeter of the wall 2, following a preferably rounded path and having a crescent-shaped recess 11, so that on pressing on the portion 12 in front of the crescent 11 an opening is formed through which a central disk or tongue 13 of the top wall 2 can be gripped to remove it along the cut line 10, causing opening of the container. During said removal, the aluminium film 8 which adheres closely to the inner surface of the wall 2 is cut perfectly along said cut line 10 of the cardboard layer 6.
  • the degassing valve according to the invention designated as a whole with reference numeral 20, is applied, without substantial modifications, to said container.
  • the valve 20 is formed in said top wall 2 of the container, the cardboard layer of which has a central deformation such as to determine an annular depression 21 on the outside, to which corresponds an annular protrusion 22 on the inside.
  • the hatching in Figure 2 indicates the areas of bonding of the aluminium film 8 to the cardboard layer 6, and as can be seen, the bonding is interrupted at a central circumference 24 outside the diaphragm 23.
  • the bonding is interrupted at two diametrically opposite tracks 25, which reach from said central circumference 24 at least to said cut line 10 in the cardboard layer 2.
  • a hole 26 Centrally to the aluminium film 8 there is provided a hole 26 (Figs 2 and 3), which can communicate with the outside through the channels that are formed between the aluminium film 8 and the cardboard layer 6 at said tracks of non-bonding 25, and said cut line 10, into which said channels open.
  • the surface of the sealing diaphragm 23 facing towards the aluminium film 8 is at least partially moistened with a viscous or lubricating substance, preferably silicone oil, so as to adhere to the aluminium film.
  • a viscous or lubricating substance preferably silicone oil
  • Said internal annular protrusion 22 is obtained by means of embossing which deforms the cardboard layer, for example by about 0.4 mm, a sufficient amount to hold the diaphragm 23 against the substantially rigid aluminium film 8, and prevent the entry of air.
  • the diaphragm 23 is made of an impermeable elastic material, for example a polyester-aluminium-polyethylene multi-layer.
  • the internal protrusion 22 and the diaphragm 23 have been shown circular in shape, in that this is the most appropriate geometrical form, because it is regular along the entire perimeter, but it is obvious that other geometrical forms are possible.
  • FIGS 4 and 5 show a valve 20 according to the invention applied to a wall 2, illustrated only partially, and comprising a layer of cardboard 6.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Packages (AREA)
EP20030011804 2003-05-26 2003-05-26 Überdruckventil für Behälter für pulverförmige Produkte Withdrawn EP1481911A1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP20030011804 EP1481911A1 (de) 2003-05-26 2003-05-26 Überdruckventil für Behälter für pulverförmige Produkte

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP20030011804 EP1481911A1 (de) 2003-05-26 2003-05-26 Überdruckventil für Behälter für pulverförmige Produkte

Publications (1)

Publication Number Publication Date
EP1481911A1 true EP1481911A1 (de) 2004-12-01

Family

ID=33104071

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20030011804 Withdrawn EP1481911A1 (de) 2003-05-26 2003-05-26 Überdruckventil für Behälter für pulverförmige Produkte

Country Status (1)

Country Link
EP (1) EP1481911A1 (de)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007115538A1 (de) 2006-04-12 2007-10-18 Nordfolien Gmbh Verpackung für schüttgüter, insbesondere sack aus kunststofffolie
US8636034B2 (en) 2011-08-31 2014-01-28 Plitek, L.L.C. Oil-less and wetted pressure relief valves having an integrated filter
US8783292B2 (en) 2011-08-31 2014-07-22 Plitek, L.L.C. Oil-less pressure relief valves
US9187229B2 (en) 2011-08-31 2015-11-17 Plitek, L.L.C. Oil-less pressure relief valves
US10358275B1 (en) 2017-06-16 2019-07-23 Plitek, L.L.C. Pressure relief valve with a plural-part dry strap
US11352183B2 (en) 2020-03-05 2022-06-07 Plitek, L.L.C. Pressure relief valve with wetting fluid reservoirs

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2027137A (en) * 1932-08-17 1936-01-07 Lucien I Yeomans Container
DE1018740B (de) * 1952-10-28 1957-10-31 Jacques Nicolas Wiser Konservenbuechse
EP0373833A2 (de) * 1988-12-12 1990-06-20 Flavorcoffee Co., Inc. Einwegventil
EP1122189A1 (de) * 1998-05-27 2001-08-08 Morinaga Milk Industry Co., Ltd. Verpackungsmaterial sowie behälter zur aufnahme von getränken und nahrungsmitteln

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2027137A (en) * 1932-08-17 1936-01-07 Lucien I Yeomans Container
DE1018740B (de) * 1952-10-28 1957-10-31 Jacques Nicolas Wiser Konservenbuechse
EP0373833A2 (de) * 1988-12-12 1990-06-20 Flavorcoffee Co., Inc. Einwegventil
EP1122189A1 (de) * 1998-05-27 2001-08-08 Morinaga Milk Industry Co., Ltd. Verpackungsmaterial sowie behälter zur aufnahme von getränken und nahrungsmitteln

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007115538A1 (de) 2006-04-12 2007-10-18 Nordfolien Gmbh Verpackung für schüttgüter, insbesondere sack aus kunststofffolie
US8636034B2 (en) 2011-08-31 2014-01-28 Plitek, L.L.C. Oil-less and wetted pressure relief valves having an integrated filter
US8783292B2 (en) 2011-08-31 2014-07-22 Plitek, L.L.C. Oil-less pressure relief valves
US9187229B2 (en) 2011-08-31 2015-11-17 Plitek, L.L.C. Oil-less pressure relief valves
US10358275B1 (en) 2017-06-16 2019-07-23 Plitek, L.L.C. Pressure relief valve with a plural-part dry strap
US11352183B2 (en) 2020-03-05 2022-06-07 Plitek, L.L.C. Pressure relief valve with wetting fluid reservoirs

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