WATER loss from fresh produce, fresh meat, fish, poultry, or other fresh or
minimally processed prepared foods as a result of normal respiration,
microbiological activity, or physical activity can occur as a result of evaporation
from the product followed by permeation through the package material
when the package material does not provide an adequate water-vapor barrier.
The use of polyethylene film carton and case liners for fresh produce, meat,
poultry, fish, and prepared food often satisfies the short-term commercial
moisture-barrier requirement but may not provide sufficient packaging if temperature
cycling occurs during the distribution of the product. When the temperature
of the product drops slightly, condensation of water-vapor deposits
liquid water on the inside of the liner. If the water-vapor content of the package
headspace is buffered to a relative humidity substantially below the approximately
95% level generated by respiration of fresh product, a safety margin
exists before condensation occurs. This feature is a characteristic of recent research
on paperboard carton coating in which the product is kept away from a
hydrophilic polymer carton liner by means of a porous polymer. Water vapor
can pass from the headspace atmosphere into the hydrophilic polymer as the
temperature varies during distribution
WATER loss from fresh produce, fresh meat, fish, poultry, or other fresh orminimally processed prepared foods as a result of normal respiration,microbiological activity, or physical activity can occur as a result of evaporationfrom the product followed by permeation through the package materialwhen the package material does not provide an adequate water-vapor barrier.The use of polyethylene film carton and case liners for fresh produce, meat,poultry, fish, and prepared food often satisfies the short-term commercialmoisture-barrier requirement but may not provide sufficient packaging if temperaturecycling occurs during the distribution of the product. When the temperatureof the product drops slightly, condensation of water-vapor depositsliquid water on the inside of the liner. If the water-vapor content of the packageheadspace is buffered to a relative humidity substantially below the approximately95% level generated by respiration of fresh product, a safety marginexists before condensation occurs. This feature is a characteristic of recent researchon paperboard carton coating in which the product is kept away from ahydrophilic polymer carton liner by means of a porous polymer. Water vaporcan pass from the headspace atmosphere into the hydrophilic polymer as thetemperature varies during distribution
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