EP2246271B1 - Heissgesiegelter Beutel aus flexibler Folie mit einem Entlastungsventil - Google Patents

Heissgesiegelter Beutel aus flexibler Folie mit einem Entlastungsventil Download PDF

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Publication number
EP2246271B1
EP2246271B1 EP20100160992 EP10160992A EP2246271B1 EP 2246271 B1 EP2246271 B1 EP 2246271B1 EP 20100160992 EP20100160992 EP 20100160992 EP 10160992 A EP10160992 A EP 10160992A EP 2246271 B1 EP2246271 B1 EP 2246271B1
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EP
European Patent Office
Prior art keywords
sac
flexible film
insert
weldable
sticker
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.)
Not-in-force
Application number
EP20100160992
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English (en)
French (fr)
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EP2246271A1 (de
Inventor
Valerio Binda
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.)
Masterpack SpA
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Masterpack SpA
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Publication date
Application filed by Masterpack SpA filed Critical Masterpack SpA
Publication of EP2246271A1 publication Critical patent/EP2246271A1/de
Application granted granted Critical
Publication of EP2246271B1 publication Critical patent/EP2246271B1/de
Not-in-force legal-status Critical Current
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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
    • B65D81/00—Containers, packaging elements, or packages, for contents presenting particular transport or storage problems, or adapted to be used for non-packaging purposes after removal of contents
    • B65D81/34—Containers, packaging elements, or packages, for contents presenting particular transport or storage problems, or adapted to be used for non-packaging purposes after removal of contents for packaging foodstuffs or other articles intended to be cooked or heated within the package
    • B65D81/3446—Containers, packaging elements, or packages, for contents presenting particular transport or storage problems, or adapted to be used for non-packaging purposes after removal of contents for packaging foodstuffs or other articles intended to be cooked or heated within the package specially adapted to be heated by microwaves
    • B65D81/3461—Flexible containers, e.g. bags, pouches, envelopes
    • 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
    • B65D2205/00—Venting means

Definitions

  • the present disclosure relates in general to packaging techniques of foodstuff and in particular in sacs of flexible film heat sealed by welding, adapted to permit to warm up the packaged food before eating it.
  • an overpressure may develop inside the package due to the evolution of vapors (typically water vapor) and/or gases from the edible foodstuff.
  • vapors typically water vapor
  • gases from the edible foodstuff.
  • the hermetically sealed sac would swell to the point of rupturing.
  • Uncontrolled rupturing of the sac when it occurs with an abrupt uncontrolled detachment of an edge heat welded perimeter of the sac determines an aspect of lack of integrity of the packaged foodstuff, beside complicating a neat opening of the sac by the customer/user which are undesirable.
  • External valves are validly used in sacs of heat welded flexible film, applied onto the outer surface of the film in form of preconstituted stickers sealing holes or cuts made through the flexible film with which the heat sealed sac is made.
  • the anti-tampering is generally implemented by common breakable cuts in the sticker film that would make permanently evident any attempt to remove it by lifting it off an edge and tearing it off the outer surface of the sac, whilst isolation from contact with the adhesive material of the valve sticker is implemented by applying a disc or polygonal patch of film of a material compatible to contact the packaged aliment, disposed on central area of the adhesive face of the valve sticker, such that the patch bonded at the center of the face of application of the valve stickers, be comfortably masking the hole or cut purposely formed through the sac film through which eventually releasing pressurized fluids. Airtightness remains ensured by the circular crown or annular area of adhesion of the valve sticker onto the outer surface of the sac, around the masking central patch disc covering the release hole or cuts in the sac film.
  • the ability of releasing pressurized fluids upon reaching a certain overpressure inside the airtight package is given by dimensioning for a resisting force to detachment of the adhesive from the outer surface of the film of the sac to the point of eventually creating a release path of the internal pressurized fluid through at least a certain arc or region of the crown or ring of adhesion of the valve sticker.
  • WO 03/048001-A1 discloses the features of the preamble of claim 1, with inclusion of a flexible diffusible film at a point along a weld seam of a food package destined to yield open and release over pressurized steam when heating the food in the sealed package.
  • US Patent No. 5,464,969 discloses the realization of a over pressure relief valve along a seal weld seam of the sac by introducing a multilayer insert between hot welded overlap edges of the sac, wherein the multilayer insert has layers weakly bonded to each other and adapted to preferentially yield open in case of overpressure.
  • WO 2008/057768-A3 discloses the insertion of a water-insoluble insert of a thermoplastic elastomer and wax at a point along a hot seal weld seam of the sac.
  • the present invention overcomes the complexities of the required tooling the wasteful use of relatively costly materials besides eliminating the need of making release holes or cuts through the flexible film with which the sacs are made.
  • the novel solution found by the applicant consists in realizing an effective and reliable release valve of pressurized fluids that may form within an airtight sac of hot welded flexible film at a point along a perimeter weld seam of the sac.
  • the vapor or other fluid release valve consists in a thin insert of relatively small dimensions, sandwiched between juxtaposed edges welded one to the other of the flexible film of heat weldable material constituting the sealed sac, according to claim 1.
  • the insert is adapted to create a tract or segment of a perimeter seam of the sac amenable to undergo detachment of adherent surfaces for creating a release flow path of any pressurized fluid upon reaching a certain maximum limit pressure inside the airtight sac.
  • the only action of predisposition of the flexible film with which will be formed the heat welded sacs consists in applying onto the surface of the inner side of the flexible film with which the sacs will be formed, in an area of the flexible film destined to be welded, a multilayered insert sticker or valve sticker, having a layer of pressure activated adhesive over a surface of a flexible plastic film of the sticker, a back surface layer of which (outermost surface of the applied sticker) is of a heat weldable material compatible to be welded to or identical to the heat weldable material of the inner side of the flexible film of fabrication of the heat sealed sacs.
  • the welding together of juxtaposed edges or perimeter sides of the sac may be carried out without any regard of the weld seam side along which the valve sticker is applied, as if there wasn't any insert.
  • weld seam will appear substantially free of discontinuities and retain a substantially uniform thickness along all the weld lines.
  • Reliability and repeatability of the condition at which release of over pressurized fluids inside the sealed sac occurs are outstandingly high, being possible to vary case by case dimensions and shapes of the insert of pre-arranged "detachment" represented by the valve sticker, at a point along a weld seam of the airtight sac, depending from the mechanical characteristics of flexibility and plasticity of the flexible film with which the sacs are made and from the maximum limit internal over pressure at which a breakdown of the airtight adhesion occurs in correspondence of the insert along a weld seam constituted by the valve sticker "welded" between opposite edge portions of the flexible film of the sac.
  • the valve sticker to be applied at a precisely defined point onto the inner surface of the heat weldable flexible film with which the sacs are formed may be defined in the desired geometrical shape by a simple die-cutting operation of a multilayered laminate.
  • the multilayered laminate consists of a flexible film or a weldable plastic material one surface of which is treated such to be “peelable” and on which is thereafter applied a layer of a common pressure operated adhesive, the valve stickers die cut therein to be thence simply applied "on-register” at precisely defined points onto the inner surface of the flexible weldable film with which the sacs are going to be formed.
  • peelable as commonly used by operators in the technical field of reference, it is intended a flexible film typically of polymeric nature, at least a surface of which is made compatible to adhere to a pressure activate adhesive though remaining detachable by tearing it off without dragging along residues of adhesive.
  • a treatment often used to render peelable the surface of a weldable plastic film consists in exposing the film to a plasma, generated for example by corona effect between a pair of electrodes, though other techniques may be followed as industrially used by manufacturers of plastic films.
  • the valve sticker is composed by a flexible film of peelable plastic material with layer of pressure activated adhesive over the side of application and having a layer of hot weldable laquer on the opposite side or back of the self-adhesive sticker, which may be of a plastic material that is not per se weldable or not compatibly weldable to the inner surface of the flexible film with which the sacs are going to be made.
  • weldability of the back of the valve sticker instead of being provided by a layer of heat weldable laquer is provided with a second flexible film of plastic material heat weldable to the material of the flexible film of the sac, bonded (laminated) by interposing an aqueous base or solvent free polyurethanic glue over the back surface of the first adhesive carrying plastic film of the sticker.
  • Fig. 1 shows a sac 1 of flexible film heat sealed by welding together juxtaposed perimeter edges 1a and 1b of the heat weldable film.
  • a longitudinal weld seam (not visible nor shown in the drawing) of juxtaposed edges brought one against the other of the flexible film ribbon of heat weldable material, such as for example polypropylene (PPcoex, PPcast).
  • the film of the sac may also be a multilayered laminate comprising for example an outer layer of polyethylene, optionally including an intermediate layer containing oxygen barrier substances, such as for example SiOx or other material adapted to stop diffusion of molecular oxygen therethrough.
  • an insert sticker or valve sticker 2 is present placed at a point in which a localized detachment of bonded surfaces should reliably occur, such to ensure airtightness of the heat sealed sac and a controlled release of internal overpressure upon reaching an established maximum limit value by creating a fluid release path for vapors and/or pressurized gas.
  • Fig. 2 is an enlarged detail view of the point of introduction of the insert sticker 2 between the heat welded edges 1a and 1b of the flexible film of the sac.
  • Fig. 3 illustrates a first way of creating a release path of vapors and/or pressurized gases determined by a breakdown of adhesion between the inner surface of the edge portion 1b of the film of the sac and a layer of pressure activated adhesive present on the application surface of the insert sticker 2 .
  • a suitable pressure activated adhesive may be for example the commercial product RC10 UV of RAFLATAC, though other commercial products with equivalent characteristics may be alternatively used.
  • Fig. 4 shows a different way of detachment of the adhesion surface of the inner surface of the edge portion 1a of the sac film through failure of the weld seam occurring between the heat weldable inner layer of the edge portion 1a and a layer of heat weldable laquer applied on the surface of the back of the insert sticker 2, which, though ensuring airtightness of the heat sealed sac under conditions of absence of a substantial internal overpressure, has a limited mechanical resistance such that upon reaching an established maximum internal overpressure in said the airtight sac, the tract of the weld seam over the back of the insert sticker 2 fails thus allowing creation of a release path of pressurized fluids.
  • Fig. 5 shows in an exploded fashion and as a composite assembly a valve or insert sticker 2 of localized detachment applicable onto the flexible film with which the sacs will be formed, according to a first embodiment.
  • the insert sticker 2 consists of a film 2' of a heat weldable material, for example of PPcoex or PPcast adapted to weld to the material constituting the inner portion of the flexible film with which the sacs are going to be formed, the surface of application of which is treated such as to receive and adhere to a layer of pressure activated adhesive 2a to constitute the insert sticker 2, applicable at pre-ordered locations of the ribbon of flexible film of fabrication of the heat sealable sacs, and the back of which will weld the other edge portion of the flexible film of the sac, thus preordering an eventual localized release of pressurized vapors and/or gases, as represented in Fig. 3 .
  • the eventual detachment may alternatively occur between the peelable surface of the film 2' and the layer of pressure activated adhesive 2a, which in this case would remain adherent to the surface of the edge portion 1b of the flexible film with which the sac is formed.
  • FIG. 6 An exemplary alternative embodiment of the insert sticker of controlled detachment in which the film 2' is of material not compatibly weldable to the material constituting the inner layer of the flexible film of formation of the hot sealed sacs is shown in Fig. 6 .
  • a layer of heat weldable laquer 21 for example a commercially available heat weldable laquer such as the product WP 7200 MI of the company FLINT or equivalent commercial products of producers such as for example HENKEL.
  • the load of heat weldable laquer may generally be comprised between about 5 g/m 2 and 10 g/m 2 though may even be greater.
  • the application of the heat weldable laquer may be carried out with a common printing technique, with a doctor blade, by contact or painting, to which may generally follow an oven treatment for evaporating off completely the solvent of the heat weldable plastic material thus distributed in a fluid state.
  • the controlled detachment mechanism with creation of a release path of vapors and/or gases may be pressurized inside the sac may occur indifferently either through the mechanism of Fig. 3 or through the mechanism of Fig. 4 in which the bonded surfaces more likely to detach from one another because of a raising inner overpressure are the hot welded surfaces of the inner layer of the edge portion 1a of the flexible film of the sac and of the layer of heat weldable laquer 21 that is applied on the back of the self-adhesive film 2' constituting the insert sticker of controlled detachment.
  • Fig. 7 shows the structure of a controlled detachment insert sticker according to a further alternative embodiment.
  • the heat sealing of the edge portion 1a of the flexible film of the sac over the insert is ensured with a multilayered structure of the insert sticker that comprises a second film 2s of the same heat weldable material of the inner portion of the flexible film of the sac or compatibly weldable to it, laminated over the first film 2', using to this end a common aqueous base or polyurethanic glue free of solvent.
  • the glue load (identified in the drawing by the layer 2c) before laminating the multilayer and curing it, may generally be comprised between 10 and 40 g/m 2 .
  • the total thickness of the controlled detachment insert sticker 2 is preferably comprised between 10 and 30 ⁇ m. It may generally be thinner than the flexible film 1 of formation of the heat sealed sacs (as represented in Figures 1-4 ) or substantially equal to or even slightly greater than the thickness of the flexible film of formation of the sacs. In any case, the presence of the control detachment insert along a perimetral weld seam does not affect continuity and dimensional uniformity (overall thickness of the weld seam that is normally formed upon forming the sac which eventually will be completely sealed after introducing the content).
  • the pressurized inner vapor and/or gases release device is constituted by the controlled detachment insert 2 between juxtaposed surfaces of edge portions of the flexible film 1 with which the sac is formed.
  • the controlled detachment insert has a shape of an isosceles trapezoid, the major base of which is toward the inner side of the sac and the minor base of which coincides or slightly protrude from the outer perimeter of the hot sealed edge portions of the flexible film of the sac.
  • the shape of the insert sticker 2 may even be different, for example of different polygonal, round or elliptical form, though it extends for the whole height (width) of the weld seam and eventually may even protrude from the weld seam internally or externally of the airtight sac.
  • the height (width) of the weld seam should not be lesser than about 10 mm and may even be useful that the weld seam may have a height (width) of at least 15 mm in order to provide for a broader range of sizing of the controlled detachment insert and ensuring an enhanced repeatitivity of the limit value of release of inner overpressure.
  • the length of the insert sticker 2 (meaning the dimension along the longitudinal axis of the weld seam) may be of one or more cm.
  • the limit value of inner overpressure at which the release through the localized breakdown of the adhesion between hot sealed edge portions of the sac thus preordered to breakdown at a certain overpressure restricts notwithstanding the other above-mentioned parameters remain the same.
  • a major base or length of the inner edge of the insert sticker 2 may be between 15 and 30 mm.
  • a trapezoidal or triangular shape with major base exposed to the inner pressurized fluid of the sac is preferred because it facilitates the correct sizing of the weld seam insert for achieving an enhanced repeatitivity of the maximum limit value of overpressure that causes the release.
  • a possible fabrication process of a heat sealed sac of flexible film will pressurize inner fluid release device according to the present disclosure, may preliminarily include that over one side of a continuous ribbon of flexible film 1 be applied, precisely at preestablished positions, insert stickers 2, the ribbon thus provided with the insert stickers adherent thereto may be rewound in reels to be stored and eventually transported, which will serve for feeding a common automatic sac forming machine.
  • the phase of forming the sacs is schematically illustrated in the diagram of Fig. 11 .
  • the ribbon of flexible film 1, already carrying adherent insert stickers 2, is unwound from the feed reel of the machine and common handling members provide to juxtapose one over the other the longitudinal edge portions of the ribbon and to weld them together along a longitudinal weld seam 3, thus forming a hot welded tubular article.
  • each insert sticker 2 is thereafter carried out a transversal heat weld 4 of the tubular article, which may have a width (height) about twice the width (height) of the insert sticker 2.
  • a transversal heat weld 4 of the tubular article which may have a width (height) about twice the width (height) of the insert sticker 2.
  • Fig. 12-15 are schematical views of several common types of heat welded flexible film sacs showing how sacs of different shape and structure may be equipped with the insert sticker 2 of the present disclosure, for ensuring a controlled and localized detachment in a hot sealed seam of edge portions of the flexible film of the sacs along any one of the perimeter weld seams of an airtight flexible sac package.

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  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Food Science & Technology (AREA)
  • Mechanical Engineering (AREA)
  • Lining Or Joining Of Plastics Or The Like (AREA)
  • Bag Frames (AREA)
  • Laminated Bodies (AREA)

Claims (10)

  1. Heißgesiegelter Beutel (1) aus einem flexiblen Film aus schweißbarem Kunststoff zur luftdichten Verpackung von Nahrungsmitteln, die vor ihrem Verbrauch aufgewärmt werden sollen, mit Mitteln zur Freisetzung von unter Druck stehenden Dämpfen und/oder Gasen, die ein Entlastungsventil in der Form eines Einsatzes zwischen nebeneinander liegenden Kantenabschnitten des flexiblen Films aus schweißbarem Kunststoff an einer Stelle längs einer Schweißnaht aufweisen, die die nebeneinander liegenden Kanten des flexiblen Films aus schweißbarem Kunststoff verbindet, dadurch gekennzeichnet, dass der Einsatz für eine örtlich begrenzte Trennung von Dichtungsflächen in der Form eines Einsatzaufklebers (2) vorliegt, der an einem präzise festgelegten Ort auf der Innenfläche des flexiblen Films in einem ersten Kantenabschnittsbereich (1a) des Films im voraus aufgebracht wird, dazu bestimmt, an einen zweiten Kantenabschnitt (1b) des Films geschweißt zu werden, der neben dem ersten Kantenabschnitt (1a) liegt, um den Beutel zu versiegeln, wobei der Einsatzaufkleber (2) aufweist mindestens einen flexiblen Film (2') aus Kunststoffmaterial, der eine erste Oberfläche, auf der eine Schicht (2a) eines Haftklebers vorhanden ist, eingerichtet, den Einsatzaufkleber an den präzise festgelegten Ort der Vorauftragung über dem ersten Kantenabschnittsbereich (1a) des flexiblen Films aus schweißbarem Kunststoff des Beutels zu kleben, und eine Rückseite des Einsatzaufklebers (2) aufweist, die sich zum Versiegeln des Beutels beim Schweißen der nebeneinander liegenden Kantenabschnitte (1a, 1b) mit der Innenfläche des zweiten Kantenabschnitts (1b) schweißverbindet;
    mindestens die Fläche der Klebung an die Haftkleberschicht (2a) der ersten Oberfläche des flexiblen Films (2') des Einsatzaufklebers (2) zur kontrollierten örtlich begrenzten Trennung von der Haftkleberschicht (2a) abziehbar ist.
  2. Beutel (1) nach Anspruch 1, wobei der flexible Film (2') des Einsatzaufklebers (2) aus einem Kunststoffmaterial besteht, das an die Innenfläche des daneben liegenden zweiten Kantenabschnitts (1b) schweißbar ist, wobei die Rückseite an die Oberfläche des daneben liegenden zweiten Kantenabschnitts (1b) geschweißt wird, wenn der Beutel heißgesiegelt wird.
  3. Beutel (1) nach Anspruch 1, wobei der flexible Film (2') des Einsatzaufklebers (2) aus einem Kunststoffmaterial besteht, das nicht kompatibel an die Innenfläche des daneben liegenden zweiten Kantenabschnitts (1b) schweißbar ist und sich die Rückseite mit der Innenfläche durch eine lösungsmittelfreie Schicht (21) eines schweißbaren Lackmaterials schweißverbindet.
  4. Beutel (1) nach Anspruch 1, wobei der flexible Film (2') des Einsatzaufklebers (2) aus einem Kunststoffmaterial besteht, das nicht kompatibel an die Innenfläche des zweiten Kantenabschnitts (1b) schweißbar ist, und sich die Rückseite mit der Innenfläche verbindet durch eine lösungsmittelfreie Schicht (2c) eines Klebers auf Wasserbasis oder eines Polyurethanklebers, und einem zweiten flexiblen Film (2bis) eines kompatibel schweißbaren Kunststoffmaterials, der über die Schicht (2c) des lösungsmittelfreien Klebers geschichtet ist, der eingerichtet ist, mit der Innenfläche des zweiten Kantenabschnitts (1b) zu verschweißen.
  5. Beutel (1) nach einem der vorhergehenden Ansprüche, wobei der Einsatzaufkleber (2) zur örtlich begrenzten Trennung eine Breite, die gleich oder größer als die Breite der Versiegelungsschweißung einer Umfangsseite des Beutels ist, und eine Länge aufweist, die als Funktion eines vorgegebenen inneren Überdrucks zum Aufbrechen des Entlastungsventils bemessen ist.
  6. Beutel (1) nach Anspruch 5, wobei der Einsatzaufkleber (2) ein trapezförmiges Profil mit einer Hauptbasis, die zum Inneren des Beutels freiliegt, und eine Nebenbasis aufweist, die mit dem Außenrand der Versiegelungsschweißung einer Umfangsseite des Beutels übereinstimmt oder sich aus ihr erstreckt.
  7. Beutel (1) nach Anspruch 1, wobei der Einsatzaufkleber (2) zur örtlich begrenzten Trennung, der zwischen Dichtungsflächen der nebeneinander liegenden Kantenabschnitte (1a, 1b) des flexiblen Films des Beutels eingelegt ist, die aneinander geschweißt sind, eine Dicke aufweist, die zwischen 30 und 100 µm liegt.
  8. Beutel (1) nach Anspruch 3, wobei der flexible Film (2') des Einsatzaufklebers (2) aus einem Material besteht, das zu der Gruppe gehört, die aus Polypropylen, Polyester und Polyamid besteht, und der schweißbare Lack (21) ein kommerzielles Produkt ist, das in Form einer flüssigen Lösung mit einer Massenbelegung, die zwischen 5 und 10 g/m2 liegt, über die Oberfläche des flexiblen Films (2') einheitlich verteilt ist und zur Entfernung des Lösungsmittels in einem Ofen behandelt ist.
  9. Beutel (1) nach Anspruch 4, wobei der flexible Film (2') des Einsatzaufklebers (2) aus einem Material besteht, das zu der Gruppe gehört, die aus Polypropylen, Polyester und Polyamid besteht, und der schweißbare Film (2bis) aus demselben Kunststoffmaterial, das die Innenfläche (1a, 1b) bildet, das an sich selbst schweißbar ist, des flexiblen Films des Beutels besteht, oder kompatibel daran schweißbar ist.
  10. Beutel nach Anspruch 1, wobei der Haftkleber (2a) ein Acrylklebestoff ist.
EP20100160992 2009-04-29 2010-04-26 Heissgesiegelter Beutel aus flexibler Folie mit einem Entlastungsventil Not-in-force EP2246271B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
ITVA2009A000029A IT1393879B1 (it) 2009-04-29 2009-04-29 Valvola di rilascio gas-vapori da confezioni in sacchetti flessibili termosaldati

Publications (2)

Publication Number Publication Date
EP2246271A1 EP2246271A1 (de) 2010-11-03
EP2246271B1 true EP2246271B1 (de) 2012-12-19

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EP20100160992 Not-in-force EP2246271B1 (de) 2009-04-29 2010-04-26 Heissgesiegelter Beutel aus flexibler Folie mit einem Entlastungsventil

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EP (1) EP2246271B1 (de)
IT (1) IT1393879B1 (de)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012103630A1 (en) * 2011-01-31 2012-08-09 Ultraperf Technologies Inc. Self venting steam valve for flexible packaging bags and pouches used in cooking of foods
CN120482519A (zh) * 2019-02-28 2025-08-15 特克逊国际有限公司 塑料膜和使用该塑料膜的包装件

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5464969A (en) * 1994-11-10 1995-11-07 Curwood, Inc. Self-venting microwaveable package and method of manufacture
JPH1111540A (ja) * 1997-06-20 1999-01-19 Sanyo Eng Kk 包装用袋
CN1325339C (zh) * 2001-12-07 2007-07-11 新圣光(马)私人有限公司 包装薄片及由该包装薄片所制成的袋子
MY146865A (en) * 2005-08-26 2012-09-28 Sin Sheng Kuang M Sdn Bhd A packaging with improved reclosable opening
WO2008057768A2 (en) * 2006-10-27 2008-05-15 Cryovac, Inc. Self-venting ovenable packaging article

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EP2246271A1 (de) 2010-11-03
ITVA20090029A1 (it) 2010-10-30
IT1393879B1 (it) 2012-05-11

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