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Dehydration and Compression of Foods (1982) / Chapter Skim
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SHELF LIFE
Pages 20-25

The Chapter Skim interface presents what we've algorithmically identified as the most significant single chunk of text within every page in the chapter.
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From page 20...
... To date these packaging needs have been met using rigid metal containers and by adapting existing flexible packaging materials to match the zero transmission properties of rigid metal containers. While the use of existing packages such as rigid containers guarantees predictable container performance, the use of these packaging systems does not allow the savings of weight and volume of the dried and compressed foods to be realized, particularly when round cans are specified.
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From page 21...
... An item-by-item systems analysis can identify minimum cost strategies for strategic stockpiling of frozen raw materials, freeze-dried products or compressed freezedried products ready for issue. The availability of processing facilities should also be studied since freeze-dryer, vacuum-driers, and microwave heating equipment represents a costly capital investment which cannot be purchased off the shelf with a short delivery time.
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From page 22...
... Slight variations in handling and processing times could result in dramatic differences in quality over the longer storage periods necessary for military stockpiles. Storage temperature is also very crucial for extended storage of frozen foods.
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From page 23...
... of mercury. While the use of an aluminum foil laminate in the pouch is believed to be equivalent to packaging in a full steel can with limited headspace, the military operational requirements for shipping, storage, and handling increase failure rates for existing flexible materials than steel cans.
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From page 24...
... By using IGC, the energy requirement for removal of water at low moisture levels can be measured. This technique could be used to study oxidation of food systems by using a continuous stream of moist carrier gas with a specific low oxygen concentration.
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From page 25...
... For example, cellophane at high humidities will readily transmit oxygen, but if kept at low humidities on both sides, it is a very good oxygen barrier. Thus, optimum packaging lies somewhere between the rigid round steel can and perhaps the cellophane wrapper used to package dry split pea and bean soup mixes for the retail consumer.
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Key Terms

  • moisture content
  • carrier gas
  • lag phase
  • water activity
  • low oxygen

  • oxygen concentration
  • packaging materials
  • storage stability
  • storage temperature
  • storage conditions

  • oxygen content
  • oxygen levels
  • ensure maximum
  • military specifications
  • raw materials

  • stationary phase
  • frozen foods
  • metal containers
  • existing flexible
  • minimum cost

  • operational performance
  • rigid metal
  • dehydrated food
  • induction period
  • analytical methods

  • cold storage
  • commercial storage
  • storage environment
  • desired shelf
  • actual storage


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