Active atmosphere container system with gas modulating membrane for food preservation

Abstract

This invention relates to a unique food preservation system that is used to extend the shelf life of food items by automatically modulating the gas composition within an air-tight container to the optimal atmospheric conditions for the specific food item(s) being stored in these containers. In order to extend the shelf life of food items, the optimal levels of carbon dioxide and oxygen must be maintained within the food storage container at all times. This is accomplished by constant real-time monitoring of the atmosphere within the food storage container and actively as well as passively controlling the atmosphere.

Claims

1. A Preservation System including an air-tight food storage container comprising a film which comprises a fabric substrate and a coating on the fabric substrate having an oxygen permeability of at least 100 cc/100 in2/day/atm and having a carbon dioxide permeability of at least 600 cc/100 in2/day/atm and at most 3,888,889 cc/100 in2/day/atm; further comprising a carbon dioxide solenoid, sensor, data logic controller, touch screen interface, membrane exposure panel, digital scale, wherein the data logic controller and the touch screen user interface, based upon the food items being stored and their respective weights measured by the integrated digital scale, automatically activates the carbon dioxide solenoid to allow a specific amount of CO2 to enter the container while additionally activating a vacuum pump for a specific amount of time and activating a membrane exposure panel motor to adjust the exposed surface area of the film in order to modulate the atmosphere within the container to the optimal levels for the multiple food items being stored, and further comprising a sensor array that provides real time monitoring of the atmosphere within the food storage container to provide continued automatic operation; whereby the gas mixture within the container is pulled into the sensor array via a sensor array pump and a sensor array gas tube and recirculated back into the container.

2. A Preservation System including an air-tight food storage container comprising a film which comprises a fabric substrate and a coating on the fabric substrate having an oxygen permeability of at least 100 cc/100 in2/day/atm with a maximum permeability of 960,000 cc/100 in2/day/atm; and further comprising a carbon dioxide solenoid, sensor, data logic controller, touch screen interface, membrane exposure panel, digital scale, wherein the data logic controller and the touch screen user interface, based upon the food items being stored and their respective weights measured by the integrated digital scale, automatically activates the carbon dioxide solenoid to allow a specific amount of CO2 to enter the container while additionally activating a vacuum pump for a specific amount of time and activating a membrane exposure panel motor to adjust the exposed surface area of the film in order to modulate the atmosphere within the container to the optimal levels for the multiple food items being stored, and further comprising a sensor array that provides real time monitoring of the atmosphere within the food storage container to provide continued automatic operation; whereby the gas mixture within the container is pulled into the sensor array via a sensor array pump and a sensor array gas tube and recirculated back into the container.

3. A Preservation System including an air-tight food storage container comprising a film which comprises a fabric substrate and a coating on the fabric substrate having a carbon dioxide permeability of at least 600 cc/100 in2/day/atm with and at most 3,888,889 cc/100 in2/day/atm; and further comprising a carbon dioxide solenoid, sensor, data logic controller, touch screen interface, membrane exposure panel, digital scale, wherein the data logic controller and the touch screen user interface, based upon the food items being stored and their respective weights measured by the integrated digital scale, automatically activates the carbon dioxide solenoid to allow a specific amount of CO2 to enter the container while additionally activating a vacuum pump for a specific amount of time and activating a membrane exposure panel motor to adjust the exposed surface area of the film in order to modulate the atmosphere within the container to the optimal levels for the multiple food items being stored, and further comprising a sensor array that provides real time monitoring of the atmosphere within the food storage container to provide continued automatic operation; whereby the gas mixture within the container is pulled into the sensor array via a sensor array pump.

4. The preservation system according to claim 1, further configured to integrate into permanently affixed drawers and/or cabinets.

5. The preservation system according to claim 1, wherein the preservation system extends the shelf life of banana to a minimum of 8 days and to a maximum of 18 days.

6. The preservation system according to claim 1, wherein the preservation system extends the shelf life of salmon to a minimum of 8 days and to a maximum of 15 days.

7. The preservation system according to claim 1, wherein the preservation system extends the shelf life of lunch meat (turkey) to a minimum of 8 days and to a maximum of 15 days.

8. The preservation system according to claim 1, wherein the preservation system extends the shelf life of strawberries to a minimum of 13 days and to a maximum of 30 days.

Description

(1) The objective of the invention is, therefore, to provide a packaging system with a passive highly permeable film coupled with an active CO2 injection system and vacuum pump which are automatically controlled by a digital logic controller which is running off of algorithms that when coupled with a suite of sensors monitoring the gas within the container, allow for the optimal atmosphere for any food item to be achieved and maintained throughout the duration of the time the food items are stored. The passive highly permeable film is used to ensure anaerobic conditions are not achieved in certain circumstances as well as provides a means to passively cycle oxygen and CO2 levels within the storage container without any power. Cycling CO2 levels from high to low and oxygen levels from low to high multiple times over the course of storage, especially for meat products, has shown to improve taste, smell, and the color of the food while reducing bacterial growth enough to significantly extend shelf life.

(2) A particular configuration of the highly permeable fabric based film is obtained by coating a permeable film with a thin layer of polymer, the coated system gets its structural strength from the film and the permeability from the polymer. This approach enables a reduction in the thickness of the polymer coating on the film, and yet maintains enough strength and durability with the film as to allow it to be attached to a container and used for an extended period of time. The Oxygen Permeation Rate of this film ranges from 110,000 cc/100 in2/day/atm up to 960,000 cc/100 in2/day/atm, with carbon dioxide permeability of at least 350,000 cc/100 in2/day/atm, with a maximum permeability of 3, 888, 889 cc/100 in2/day/atm at 13° C.

BRIEF DESCRIPTION OF THE DRAWINGS

(3) The foregoing and other objects, features and advantages of the invention will be apparent from the following description of particular embodiments of the invention, as illustrated in the accompanying drawings in which like reference characters refer to the same parts throughout the different views. The drawings are not necessarily to scale, emphasis instead being placed upon illustrating the principles of the invention.

(4) The Food Preservation System comprises of an air-tight food storage container (8) with a lid (6) and a base (9). The container lid (6) is capable of being opened as to access any food items stored within the container base (9).

(5) In order to extend the shelf life of food items, the optimal levels of carbon dioxide and oxygen must be maintained within the food storage container (8) at all times. This is accomplished by constant real-time monitoring of the atmosphere within the food storage container (8); whereby the gas mixture within the container (8) is pulled into the sensor array (13) via the sensor array pump (17) and sensor array gas tube (15). This gas is first passed through a water trap (16) and then is passed through a carbon dioxide sensor (14), oxygen sensor (18), temperature sensor (19) and humidity sensor (20). The gas is then allowed to exit back into the container (8) for recirculation. The electronic readings from the sensor array (13) are then sent to the data logic controller (21).

(6) Based on the readings from the sensors, and what food items are selected for storage by the user via the user touch screen interface (22), the data logic controller (21) activates the carbon dioxide solenoid (5), vacuum pump (12) and membrane exposure panel motor (27) to modulate the atmosphere within the container to the optimal levels for the food items being stored. The algorithm for run time of the carbon dioxide injection, position of the membrane surface area exposure panel and vacuum pump run time varies depending on the food item(s) being stored, but can include any combination of membrane (7) surface area exposure; which is controlled by the membrane surface area exposure panel (29) which can limit the membrane surface area which is exposed to the ambient atmosphere and is connected to the membrane exposure area motor (27) by a mechanical linkage (28); carbon dioxide injection time, which is controlled by the carbon dioxide solenoid valve (4) which allows pressurized carbon dioxide to flow from the carbon dioxide pressurized cartridge (1) through the carbon dioxide gas tube (3), carbon dioxide solenoid valve (4), one way carbon dioxide gas valve (5) and pass into the air tight food storage container (8); vacuum pump (12) run time, which draws gas from the air tight food storage container (8) via the vacuum tube (10) which passes through the one way vacuum gas valve (11) before entering the vacuum pump (12) and being expelled outside of the air tight food storage container (8); and storage food item weight, which can be detected by the integrated digital scale (32).

(7) The carbon dioxide solenoid valve (4) is connected to the data logic controller (21) by electrical wire 25. The membrane exposure area motor (27) is connected to the data logic controller by electrical wire 26. The sensor array (13) is connected to the data logic controller by electrical wire 24. The integrated digital scale (32) is connected to the data logic controller by electrical wire 33. The data logic controller is powered by power source 31, which may be any form of battery or shore power. All system power is controlled through the data logic controller (21).

(8) The carbon dioxide pressurized cartridge (1) can be threaded into the cartridge receptacle fitting (2) as to allow the carbon dioxide pressurized cartridge (1) to be removed and replaced when the gas is depleted. The cartridge receptacle fitting (2) can also be connected to non-cartridge constant flow source of carbon dioxide.

(9) The membrane (7) is capable of utilizing the partial pressure within the air tight container (8) to transfer carbon dioxide within the container to the ambient environment and oxygen from the ambient environment to the inside of the air tight container at a ratio of 1 oxygen molecule to every 6 carbon dioxide molecules. The membrane is also hydrophobic and does not allow moisture to pass through.

(10) The entire Food Preservation System (30) may be integrated into a larger but man transportable container as to make the system capable of standalone operation. In such a standalone configuration the Food Preservation System system (30) could be placed into a larger refrigerated container, but would nut be permanently integrated into the refrigeration system.

(11) The Food Preservation System system (30) could also be permanently integrated into or coupled with a refrigeration system as to provide cooling capacity to the air tight container (8) to cool the contained food items.