The present application and the resultant patent relate generally to food and beverage containers and the like and more particularly relate to a ventable package for food and beverages having a hermetically sealed lid capable of self-venting under the application of heat and/or internal pressure.
Cups and other containers may be filled with food or beverages and sealed for shipment to a consumer. The container may be made of plastic, paper, glass, or other types of suitable materials with a hermetically sealed lid such as a foil or plastic membrane. The contents of the container thus may be protected from environmental ingress and/or contamination. Depending on the filling conditions and the barrier properties of the container, the contents may have a long shelf-life.
If aseptically filled, a beverage may be safely distributed at ambient temperatures because the beverage remains sealed from the external environment. If, however, the product is heated at the point of use by microwave energy, induction, conduction, or another heating method, the contents and headspace within the container may become hot and may expand. This expansion may cause an uncontrolled release of the pressure by bursting the membrane or the membrane seal or another weak point in the container. This can result in a sudden release of the pressure and/or other undesirable consequences. Moreover, the pressure may exacerbated the distortion of the container sidewalls, base, and/or top and may result in rocker bottoms, bulging appearances, and may cause the container to tip over and spill the contents therein. Due to the resultant large opening, the contents of the container may now easily spill while carrying the container.
The present application and the resultant patent provide a ventable package capable of releasing pressure upon the application of heat. The ventable package may include a container and a lid. The lid may include a sealing layer attached to the container and a foil layer attached to the sealing layer. The sealing layer may include one or more slits therein such that, upon the application of heat, the foil layer separates from the sealing layer about the one or more slits to release the pressure therein.
The present application and the resulting patent further provide a ventable package for food and beverages capable of releasing pressure upon the application of heat or internal pressure. The ventable package may include a plastic container and a lid. The plastic container may include a ledge. The lid may include a plastic sealing layer attached to the ledge of the plastic container and an aluminum foil layer attached to the plastic sealing layer. The plastic sealing layer may include one or more slits therein such that, upon the application of heat or internal pressure, the aluminum foil layer separates from the plastic sealing layer about the one or more slits to release the pressure therein.
These and other features and improvements of the present application and the resultant patent will become apparent to one of ordinary skill in the art upon review of the following detailed description when taken in conjunction with the shown drawings and the appended claims.
Referring now to the drawings, in which like numerals refer to like elements throughout the several views,
The lid 120 also may have any suitable size, shape, or configuration. The shape of the lid 120 may conform generally to the shape of the container 110 and more specifically to the shape of the ledge 140.
The top layer 170 may be a plastic overlacquer 200 or other types of overlayers. For example, the plastic overlacquer 200 may be acrylate-based or a polymer lamination and the like. One of the middle layers 180 may be a paper layer 210. The paper layer 210 may be printed with product indicia, graphics, and the like. A further middle layer 180 may be an aluminum foil layer 220 and the like. The aluminum foil layer 220 may be a soft aluminum alloy and the like. The bottom layer 190 may be a plastic sealant layer 230. The plastic sealant layer 230 may include polyolefin, acrylate, and the like. The plastic sealant layer 230 may be adhered to the aluminum foil layer 220 in a strong but breakable bond. Likewise, the plastic sealant layer 230 forms a permanent, un-separable bond with the container 110, i.e., about the ledge 140 of the container 110. The plastic sealant layer 230 may be sealed to the container 110 via heat, pressure, ultrasonics, and other sealing technics. As is shown in
The plastic sealing layer 230 may have one or more slits 270 formed therein. The slits 270 may extend through the width of the plastic sealing layer 230 to the aluminum foil layer 220. The slits 270 may be formed via laser scoring and similar techniques. Additionally, the slits 270 may be formed separately in the sealant layer, and such layer may then be laminated to the other layers of the lid 120 (the other layer next to the sealing layer may be aluminum or any number of other suitable materials). Any number of the slits 270 may be used in any suitable size, shape, or configuration. The slits 270 may be formed in the middle portion 250 of the plastic sealing layer 230 close to the periphery 240. Specifically, the slits 270 may be about 1 to about 40 millimeters in length and may be positioned from about 0 to about 5 millimeters from the seal inner edge (i.e., the inside edge of the ledge 140) or about 2 to about 7 millimeters from the exterior edge or the periphery 240. The size and shape of the slits 270 may vary according to the size and shape of the lid 120 and the container 110. The slits 270 may be positioned such that they compensate for tolerance variations that may occur in the placement of lid 120 onto the container 110 caused by variations in the conveyor plates, lid placement, and/or sealing heads so as to ensure that at least one of the slits 270 will function as desired if the others are sealed over or are otherwise mispositioned.
In use, food, beverages, or other items may be placed in the container 110. The lid 120 with the slits 270 thereon may be attached to the container 110 to hermetically seal and form the ventable package 100. At this point the slits 270 extend proximal to the edge of the ledge 140 of the container 110 but do not provide a pathway for air exchange between the container 110 and the environment. When the ventable package 100 is heated, increased gas pressure develops therein. (Heat alone is not sufficient.) When sufficient pressure is developed, tensile forces will act upon the lid 120 causing the plastic sealing layer 230 to separate from the aluminum layer 220 thus causing the gas to flow into an exit path(s) 280 created by the slits 270, thus permitting the gas to escape therethrough. As is shown in
The ventable package 100 thus may safely and controllably relieve the internal pressure (gas/water vapor) therein while maintaining other desirable functions such as a reduced or no propensity to spill the contents such that consumers can easily walk or transport the ventable package 100. This feature is also very useful to ensure venting of the ventable package 100 if it is accidentally or intentionally overheated. This feature also ensures that the ventable package 110 always maintains, prior to opening, a hermetic seal against the environment prior to use and as such assists with providing prolonged product protection for sterility and long shelf-life.
Moreover, the ventable package 100 does not use additional materials, components, or weight for more affordable packaging materials costs, i.e., the ventable package 100 does not need to be extremely rigid to withstand and resist the pressures that are generated during heating. Instead, the pressure relieves out of the ventable package 100 at higher pressures thus allowing the use of thinner walls that, without the exit path 280, would otherwise be likely to deform. The ventable package 100 thus does not require conforming walls, panels, or other features that accommodate the expansion caused by pressure build-up therein. The ventable package 100 provides a simpler, less complex, and lighter container design because conforming walls, stiffing features, or thicker profiles are not required.
It should be apparent that the foregoing relates only to certain embodiments of the present application and the resultant patent. Numerous changes and modifications may be made herein by one of ordinary skill in the art without departing from the general spirit and scope of the invention as defined by the following claims and the equivalents thereof.
Filing Document | Filing Date | Country | Kind |
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PCT/US2021/027475 | 4/15/2021 | WO |
Number | Date | Country | |
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63011618 | Apr 2020 | US |