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Publication numberUS3432087 A
Publication typeGrant
Publication dateMar 11, 1969
Filing dateAug 17, 1967
Priority dateSep 1, 1966
Publication numberUS 3432087 A, US 3432087A, US-A-3432087, US3432087 A, US3432087A
InventorsCostello Alfred P
Original AssigneeCostello Alfred P
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Package valve
US 3432087 A
Abstract  available in
Images(1)
Previous page
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Claims  available in
Description  (OCR text may contain errors)

March 11, 1969 COSTELLO 3,432,087

' PACKAGE VALVE Filed Aug. 1'7, 1967 Fig. 2

Pg. 3 Fig. 5 F7 15 Fig. 7

Alfred P. Costello 2 v tor y Age It United States Patent O 39,060/ 66 US. Cl. 229-625 Int. Cl. B65d 31/14, 17/24, 5/70 6 Claims ABSTRACT OF THE DISCLOSURE A package valve adapted for use with evacuated packaged food products. A seal of pressure sensitive tape secured over a weakened portion of the package, adapted for the seal to lift when pressure within the package rises sufiiciently to rupture the weakened portion.

BACKGROUND OF THE INVENTION The invention relates to pressure relief valves of a type known as a package valve. It is particularly but not exclusively adapted for use in food packaging.

As is well known, precooked or partially cooked food is often packaged in a plastic bag which, commonly, is evacuated and sealed. Foods so packaged may be prepared by boiling and, notwithstanding the package may have been evacuated, pressure may build up during boiling. Also, from time to time gasses may be generated Within the package, perhaps during storage, or the seal may be such that, after storage for a time, some air may have leaked into the container.

Pressure may thus accumulate whether or not the package is exposed to heat-by boiling or otherwise-and any initial pressure build-up will increase with heating. It will be understood by those skilled in the art that, where a package is evacuated, the vacuum is not high--nor is there particular need that it should be. Thus, pressure build-up can and does occur, and may be sufficicnt to fracture the bag.

If pressure build-up occurs before cooking, it is clear that there may be danger of the food becoming contaminated. When the pressure occurs during cooking, while there will be no contamination caused by the pressure build-up during heating, bursting of the bag-for instance whilst boiling-is undesirable since, for example in the case of packaged fish, attainment of particular advantages of packaged cooking technique, namely the freedom from odor and the easewith which a container used for preparing the food maybe cleaned thereafter, is incomplete.

In certain procedures such packaged food is prepared for consumption by high frequency electronic means, and it is found that there may be pressure build-up when this method is used. While a high frequency cooking means are not as yet ordinarily found in household stoves, there are domestic high frequency stoves already available on the market, notwithstanding that at this time such means are commonly found only in commercial establishments.

SUMMARY OF THE INVENTION The difliculties and disadvantages above may be materially reduced by providing a suitable valve means of the package. As packaging costs are passed to the consumer to be commercially successful for the present purpose a valve must, not only be acceptable functionally, but also must be of such construction that it does not add mate rially to the cost to the consumer.

While valves which meet the functional and mechanical requirement are available, the valve of my invention is 3,432,087 Patented Mar. 11, 1969 distinguished from the prior art as known to me both by its structure and by its low costthus to meet both requirements above.

Basically, my invention is a valve structure for the above described purposes, the structure having in combination; a weakend portion of a wall of the package, and a flexible sealing element having a side coated with pressure sensitive adhesive placed in adhesive engagement with an outer surface of the package over, and extending beyond, the periphery of the weakened portion. The weakened portion may, for instance, be attained by a scored or perforated outline defining the periphery, or a part of the periphery. The sealing element, usually pressure sensitive tape, prevents leakage and fracture up to a particular pressure. When, from any cause, a difference in pressure between the inside and the outside of the package exceed the particular value, the weakened periphcry will rupture thus to lift the tape, so providing escape of the internal gasses. The magnitude of pressure required to cause this to happen depends upon factors including the depth of the scoring or, in the case of perforations, the spacing between perforations, and the excess of the area of the pressure sensitive tape over the area of the outline. It is thus seen that it is a matter of design to provide a substantial range of pressure difference at which the valve will open so to permit escape of the internal gasses. It is also to be noted that, in some circumstances, when the internal pressure is relieved the pressure sensitive tape may automatically reseal the opening. Where the package is being boiled, self rescaling might occurwhile such rescaling may be incomplete, it will ordinarily occur quickly and be sufficient to prevent much water from entering the package, and to confine the food within the package.

In other environments and for other purposes, the pressure sensitive adhesive seal can be placed on an inner surface of the container so that, for instance in pressure preparation of a product, fluid is admitted to the interior of a package upon a particular pressure being reached.

DESCRIPTION OF THE DRAWINGS FIGURE 1 shows a fragmented package having a valve according to the invention,

FIGURE 2 is a section on 2-2 of FIGURE 1, thickness of the wall and of the seal being exaggerated for clarity of illustration,

FIGURE 3 is a fragmented detail of a side wall of the package, showing a weakened portion,

FIGURE 4 is a section on line 4-4 of FIGURE 1, thickness being exaggerated as in FIGURE 2,

FIGURE 5 shows an alternative form of weakened portion with perforations extending only partially around the periphery,

FIGURE 6 shows a weakened portion defined by a peripheral score,

FIGURE 7 shows a score extending only partially around the periphery,

FIGURE 8 shows a circular embodiment of the flexible seal,

FIGURE 9 shows a generally rectangular embodiment of the seal.

The drawings, and the description following relating thereto, are given by Way of exampleit is to be understood that the invention can be expressed in structure other than that of the particular examples described and illustrated.

DESCRIPTION OF PREPARED EMBODIMENTS Description of FIGURES I, 2, 3

The numeral 10 indicates generally a package of the subject kind. The package is commonly a sealed evacuated envelope of transparent plastic material having a side wall 11. A valve according to the invention is indicated generally by the numeral 12, the valve having a flexible sealing element 13, suitably pressure sensitive adhesive tape of a known kind, secured adhesive side down in engagement with the package wall 11, and disposed generally centrally over a weakened portion 14, shown in broken outline in FIGURE 1. The weakened portion 14 is generally circular, having a periphery defined by a plurality of closely spaced perforations 15. The flexible pressure sensitive seal 13 is also generally circular having a diameter larger than that of the weakened portion 14, and can be provided with a tab 16.

OPERATION, WITH PARTICULAR REFERENCE TO FIGURE 4- When for instance the package is immersed in boiling water, pressure against the wall 11 from the water is in a direction indicated by an arrow 17. Pressure in the interior of the package is indicated by an arrow 18, originally that pressure was below atmospheric but, as previously explained, through leakage or other causes it might be above or below atmospheric upon immersion. Should the pressure 18 rise to a value higher than the pressure 17 by an amount suflicient to cause the weakened portion to rupture, and thus to lift an end 19 of the seal opposite the tab 16, conditions will be as shown in FIGURE 4. The weakened portion has ruptured at a space 15.1 between adjacent spaced perforations 15, leaving a ruptured edge 15.2 of the weakened portion urged away from the package side wall 11 as shown, so that the pressure 18 is relieved escaping through the ruptured weakened area until inner and outer pressures are equalized. It is to be noted that the tab 16 acts as a. hinge, and will remain secured to the wall 11 after rupture and lifting.

When the pressures 17 and 18 are equalized the flexible seal could hang free, and if desired resealing can be effected when the package is withdrawn by pressing the seal against the wall 11 so that the adhesive side 21 of the seal is again secured. Resealing is facilitated when a tab 16 is provided. In some circumstances, rescaling or partial resealing could be automatic.

ALTERNATIVE EMBODIMENTS Weakened portion FIGURES 5, 6, 7 show alternative weakened portion structures.

In FIGURE 5, a weakened portion designated 14.5 is defined by a plurality of closely spaced perforations 15, the perforations however extending only partially around the periphery of the weakened portion so as to leave an unweakened peripheral part as seen at 22. In FIGURE 6, a weakened portion 146 is defined by a score 23. In FIG- URE 7, a weakened area 14.7 is defined by a peripheral score 24 extending only partialy around the periphery so as to leave an unweakened portion designated 25. Reseal ing is facilitated when unweakened portions, as 22 and 25, are provided.

Seal shape The pressure sensitive flexible seal may be circular, that is to say without the hinge tab 16 (FIGURE 1) which circular form is illustrated in FIGURE 8, or it may be rectangular as seen in FIGURE 7 designated 27, the rectangular flexible seal can also be provided with a tab portion indicated in broken outline by the numeral 28. Irregular shape, not shown, may also be used.

The amount by which the pressure 18 must exceed the pressure 17 before rupture occurs depends upon the relative areas of the seal 15 and the weakened portion 14, upon the spacing of the perforations 15, upon the material of the package wall, and upon other design factors. Thus, a particular pressure difference best suited to the use to which the package valve is to be put is a matter of design, and therefore is not herein described.

The foregoing descriptions have been given by way of example, and, while the release valve construction of my invention is particularly adapted for use in food packaging, the invention is not confined thereto. It can, for instance, be used in other circumstances where either self sealing or a manually rescaling valve is required, and indeed for many purposes for which a safety valve of a cheap and simple construction might be required.

The embodiments of the invention in which an exclusive property or privilege is claimed are defined as follows:

1. A valve structure for a generally fluid tight package having a wall; in combination (a) a peripherally weakened portion of the wall,

(b) a flexible sealing element larger than the weakened portion aforesaid and having an inner side coated with pressure sensitive adhesive, the inner side being in adhesive engagement with a surface of the wall over and extending beyond the peripherally weakened portion,

the valve being constructed and arranged so that when fluid pressure on a side of the wall remote from the sealing element exceeds fluid pressure on the sealing element by a determinate amount, the peripherally weakened portion will rupture so disengaging the inner side of the sealing element and permitting passage of fluid through the valve.

2. Structure as defined in claim 1, the weakened portion being defined by closely spaced perforations.

3. Structure as defined in claim 1, the weakened portion being a peripheral score.

4. Structure as defined in claim 1, the flexible sealing elements having a hinge tab.

5. Structure as defined in claim 4, the weakened portion being defined by closely spaced perforations.

6. Structure as defined in claim 4, the weakened portion being a peripheral score.

References Cited UNITED STATES PATENTS 670,794 3/1901 Lott. 3,175,752 3/1965 "Stabenow 229-66 X 3,243,075 3/1966 Reinke 220-44 DAVID M. BOCKENEK, Primary Examiner.

U .5. Cl. X.R.

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US670794 *Jul 25, 1900Mar 26, 1901John B LottValve.
US3175752 *May 3, 1963Mar 30, 1965Union Carbide CorpPackage tearing means
US3243075 *Nov 18, 1963Mar 29, 1966American Can CoContainer body and closure structure
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US3595467 *Jan 15, 1969Jul 27, 1971Goglio LuigiFlexible sealed container provided with a one-way safety valve
US3637132 *Jan 9, 1970Jan 25, 1972Oscar S GrayPressure release package or container
US3776450 *Feb 14, 1972Dec 4, 1973Christenssons MaskinerFoil for closing easily openable packages
US3803815 *Mar 10, 1972Apr 16, 1974Cons Foods CorpSelf-sealing disposable vacuum cleaner dust bag
US3989853 *Nov 18, 1974Nov 2, 1976Forkner John HMethod for expanding confections in a package
US4122993 *Aug 16, 1976Oct 31, 1978Robert Bosch GmbhPressure-equalizing valve for a packaging container
US4137333 *Feb 2, 1976Jan 30, 1979Daswick Alexander CPackaged meat sandwich
US4141487 *Mar 29, 1977Feb 27, 1979Union Carbide CorporationDisposable food package
US4260060 *Sep 17, 1979Apr 7, 1981Champion International CorporationFood carton for microwave heating
US4419373 *Mar 29, 1982Dec 6, 1983American Can CompanyMethod of heating contents in a self venting container
US4449242 *Aug 31, 1982May 15, 1984The United States Of America As Represented By The Secretary Of The Air ForceFlexible, resilient anti-contamination baffle
US4461420 *Oct 22, 1982Jul 24, 1984Cod Inter Techniques SaVentable package cover
US4491224 *Oct 22, 1982Jan 1, 1985C O D Inter Techniques SaWeldable tear-off capping film for sealing packages
US4530440 *Aug 3, 1982Jul 23, 1985Buxdel Pty. LimitedContainer lid with temperature responsive vents
US4548824 *May 2, 1983Oct 22, 1985Pakor, Inc.Package for storing perishable products in a reduced air atmosphere
US4548852 *May 2, 1983Oct 22, 1985Pakor, Inc.Method and apparatus for packaging perishable products in a reduced air atmosphere
US4640838 *Sep 6, 1984Feb 3, 1987Minnesota Mining And Manufacturing CompanySelf-venting vapor-tight microwave oven package
US4779736 *Sep 27, 1985Oct 25, 1988Gordon GeaslandTubular plastic shipping, storage and dispensing container
US4817815 *Apr 5, 1988Apr 4, 1989American Suessen CorporationContainer comprising cylindrical jacket and lid with closable vent and process for its production
US4890637 *Jan 19, 1989Jan 2, 1990Flavorcoffee Co. Inc.One way valve
US4904489 *Jul 22, 1988Feb 27, 1990Bach Bert RPackage for convection heating of food
US4961944 *Sep 20, 1988Oct 9, 1990Gourmec Laboratory Co., Ltd.Package for microwave oven cooking and method of use
US5004449 *Dec 15, 1989Apr 2, 1991Nhk Spring Co., Ltd.Sealed tensioner
US5007662 *Oct 16, 1989Apr 16, 1991Ford Motor CompanyAir bag relief valve
US5117999 *Apr 18, 1990Jun 2, 1992Canzano Pasquale SLow pressure relief valve for fixed and movable systems
US5201459 *Nov 14, 1991Apr 13, 1993Tropicana Products, Inc.Beverage container with novel dispensing means
US5348217 *Oct 26, 1992Sep 20, 1994Tropicana Products, Inc.Beverage container with novel dispensing means
US5362152 *Sep 24, 1993Nov 8, 1994Sonoco Products CompanyT-shirt type plastic bag for carrying hot food
US5399022 *Feb 25, 1993Mar 21, 1995Ab Specialty Packaging, Inc.Venting structure for a multiple ply bag
US5587192 *Sep 29, 1994Dec 24, 1996Societe De Constructions De Material MetalliqueVentable container
US5806703 *Mar 30, 1995Sep 15, 1998Grandi; ReneSafety valve device for packagings containing products to be cooked, cooled, reheated or degassed
US5992442 *May 29, 1997Nov 30, 1999Urquhart; Edward F.Relief valve for use with hermetically sealed flexible container
US6024709 *Sep 8, 1997Feb 15, 2000Stark; Wayne T.Urine specimen cup arrangement
US6135637 *Nov 26, 1999Oct 24, 2000Daniel S. Y. KimCompressible disposal trash sack
US6286681Apr 27, 2000Sep 11, 2001Sonoco Development, Inc.Ventilated plastic bag
US6380524Aug 9, 2000Apr 30, 2002Karl KellerMicrowavable food package having valve and method of use
US6607764 *Dec 18, 1998Aug 19, 2003Karl KellerVentable, microwave-safe food package
US6814991 *Sep 14, 2001Nov 9, 2004Kabushiki Kaisha ZacPackaging container, packaged food and packaged feed
US7004632Mar 31, 2003Feb 28, 2006The Glad Products CompanyVentable storage bag
US7045190 *Apr 25, 2001May 16, 2006Hiromichi InagakiPackaging material and packaged product
US7244223 *Sep 29, 2005Jul 17, 2007Avery Dennison CorporationFood bag release valve
US7294354 *Oct 29, 2004Nov 13, 2007Sonoco Development, Inc.Container with gas release feature
US7399263Jun 6, 2007Jul 15, 2008Avery Dennison CorporationFood bag release valve
US7494701Mar 21, 2007Feb 24, 2009Irene LinReusable air permeable packaging film
US7596931Nov 12, 2007Oct 6, 2009Sonoco Development, Inc.Container with gas release feature
US7775019 *Apr 5, 2006Aug 17, 2010Robert Bosch GmbhAutomated operation application module, in particular for a packaging machine
US8020723Jul 2, 2007Sep 20, 2011Stull Technologies, Inc.Removable locking container lid with outer skirt
US20020054938 *Sep 14, 2001May 9, 2002Sachiko HiyoshiPackaging container, packaged food and packaged feed
US20040188310 *Mar 31, 2003Sep 30, 2004Peter HamiltonVentable storage bag
US20050074531 *Aug 8, 2003Apr 7, 2005Patterson Miles RoylanceGas control packaging
US20050233035 *Jul 4, 2003Oct 20, 2005Burrall LimitedMicrowavable food package having a venting valve
US20060030472 *Sep 29, 2005Feb 9, 2006Hartman William GFood bag release valve
US20120008885 *Nov 26, 2008Jan 12, 2012Karatzis S.A.Packaging bag
US20140027446 *Jan 4, 2012Jan 30, 2014Ultraperf Technologies Inc.Self venting steam valve for flexible packaging bags and pouches used in cooking of foods
USRE32018 *Mar 8, 1982Nov 5, 1985Robert Bosch GmbhMethod of producing sealed packaging containers
DE2200266A1 *Jan 4, 1972Jul 27, 1972Tetra Pak Internat AbBahnfoermiges Verpackungsmaterial sowie Verfahren und Vorrichtung zu dessen Herstellung
DE2949496A1 *Dec 8, 1979Jun 11, 1981Senning Christian VerpackungWeichpackung aus einer kunststoffolie, insbesondere fuer papiertaschentuecher
EP0451980A2 *Mar 22, 1991Oct 16, 1991Kraft Jacobs Suchard Ltd.Packages containing comestibles
WO1989007555A1 *Feb 16, 1988Aug 24, 1989Gordon GeaslandTubular plastic shipping, storage and dispensing container and parts usable therewith
WO2001036280A1 *Nov 10, 2000May 25, 2001Birk UweWall section with sealing layer for containers
WO2004005161A1 *Jul 4, 2003Jan 15, 2004Buralls Of Wisbech LtdMicrowavable food package having a venting valve
WO2005036983A2 *Oct 18, 2004Apr 28, 2005Pouch Pac Innovations LlcPackaging release valve for microwavable food items
WO2006092562A1 *Feb 24, 2006Sep 8, 2006Ffp Packaging Solutions LtdSelf-venting cover for heatable food package
Classifications
U.S. Classification383/103, 426/113, 426/118, 220/203.16, 383/106
International ClassificationB65D77/22
Cooperative ClassificationB65D77/225
European ClassificationB65D77/22D