Package making – With contents treating – Vacuum or inert atmosphere
Reexamination Certificate
2001-08-10
2002-12-17
Gerrity, Stephen F. (Department: 3721)
Package making
With contents treating
Vacuum or inert atmosphere
C053S055000, C053S1110RC, C053S155000
Reexamination Certificate
active
06494023
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates generally to inserting an oxygen scavenger into a modified atmosphere package for storing food. More particularly, the invention relates to a method and apparatus for inserting an oxygen scavenger into a modified atmosphere package for extending the shelf life of raw meats or other food stored therein.
BACKGROUND OF THE INVENTION
Containers have long been employed to store and transfer perishable food prior to presenting the food at a market where it will be purchased by the consumer. After perishable foods, such as meats, fruits, and vegetables, are harvested, they are placed into containers to preserve those foods for as long as possible. Maximizing the time in which the food remains preserved in the containers increases the profitability of all entities in the chain of distribution by minimizing the amount of spoilage.
The environment around which the food is preserved is a critical factor in the preservation process. Not only is maintaining an adequate temperature important, but the molecular and chemical content of the gases surrounding the food is significant as well. By providing an appropriate gas content to the environment surrounding the food, the food can be better preserved when maintained at the proper temperature or even when it is exposed to variations in temperature. This gives the food producer some assurance that after the food leaves his or her control, the food will be in an acceptable condition when it reaches the consumer.
Modified atmosphere packaging systems for one type of food, raw meats, expose these raw meats to either extremely high levels or extremely low levels of oxygen (O
2
). Packaging systems which provide extremely low levels of oxygen are generally preferable because it is well known that the fresh quality of meat can be preserved longer under anaerobic conditions than under aerobic conditions. Maintaining low levels of oxygen minimizes the growth and multiplication of aerobic bacteria.
One example of a low-level oxygen system is disclosed in U.S. Pat. No. 5,698,250 to DelDuca et al. In the DelDuca system, an oxygen reduction technique such as gas flushing is used to initially remove most of the oxygen from a modified atmosphere package containing raw meat. Just prior to sealing the oxygen depleted package, an oxygen scavenger is placed in the package to absorb any residual oxygen therein. The oxygen scavenger continues to absorb any oxygen in the package after it has been sealed. A significant advantage of the DelDuca system is that it can operate at exceptionally fast speeds relative to prior art systems that rely solely upon evacuation techniques to diminish oxygen levels. However, in order to maintain such a relatively high throughput, it is important that each portion of the DelDuca system operate quickly and efficiently.
To that end, the present invention provides a system and method for quickly and efficiently inserting an oxygen scavenger into a modified atmosphere package.
SUMMARY OF THE INVENTION
Briefly, the present invention is directed to a unique method and apparatus for inserting an oxygen scavenger into a modified atmosphere package for extending the shelf life of food, especially raw meats.
The inventive apparatus for inserting an oxygen scavenger into a modified atmosphere package includes multiple stations or components. The apparatus includes a scavenger feeding means for feeding a chain of interconnected oxygen scavengers. A separating means separates the oxygen scavenger located at an exposed end of the chain of interconnected oxygen scavengers from the chain of interconnected oxygen scavengers. Optionally, the apparatus employs an injecting means for injecting the oxygen scavenger located at the exposed end of the chain of interconnected oxygen scavengers with an oxygen uptake accelerator to activate the oxygen scavenger at the exposed end prior to separating the oxygen scavenger from the chain of interconnected oxygen scavengers. An adhesive application means applies adhesive to the oxygen scavenger which has been separated from the chain of interconnected oxygen scavengers. A conveyor means conveys the separated oxygen scavenger to a position which is adjacent to a film layer which is used to form an outer package. The oxygen scavenger is attached to a surface of the film layer by the adhesive. The film layer is subsequently formed into a container portion of the modified atmosphere package so that the oxygen scavenger is contained therein.
The inventive method for inserting an oxygen scavenger into a modified atmosphere package involves multiple steps. First, a chain of interconnected oxygen scavengers is provided. Next, the oxygen scavenger which is located at an exposed end of the chain of interconnected oxygen scavengers is separated from the chain. Optionally, the oxygen scavenger located at the exposed end of the chain of interconnected oxygen scavengers is injected with an oxygen uptake accelerator to activate the oxygen scavenger located at the exposed end prior to separating the oxygen scavenger from the chain of interconnected oxygen scavengers. Adhesive is then applied to the oxygen scavenger which has been separated from the chain of interconnected oxygen scavengers. The separated oxygen scavenger is then conveyed to a position which is adjacent to a film layer that is used to form an outer package so that the oxygen scavenger is attached to a surface of the film layer by the adhesive. The film layer which now has the oxygen scavenger attached thereto is then formed into a container portion of the modified atmosphere package so that the oxygen scavenger is contained therein.
The above summary of the present invention is not intended to represent each embodiment or every aspect of the present invention. This is the purpose of the figures and detailed description which follow.
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patent: 4
DelDuca Gary R.
Goulette Stephen L.
Hansen Darryl P.
Luthra Vinod K.
Gerrity Stephen F.
Jenkens & Gilchrist
Pactiv Corporation
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