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Heating Rates in Flexible Packages Containing Entrapped Air During Overpressure Processing
Author(s) -
WEINTRAUB SARA E.,
RAMASWAMY HOSAHALLI S.,
TUNG MARVIN A.
Publication year - 1989
Publication title -
journal of food science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.772
H-Index - 150
eISSN - 1750-3841
pISSN - 0022-1147
DOI - 10.1111/j.1365-2621.1989.tb05124.x
Subject(s) - retort , overpressure , warm front , materials science , environmental science , composite material , waste management , thermodynamics , mechanical engineering , engineering , physics
Experiments were performed in two steam/air retorts and one water immersion retort to test the influence of included air on heating rate index (f h ) values at the center of thin plastic bricks packaged in retort pouches and processed under various temperature and overpressure conditions. In general, high air overpressures (>80 kPa) allowed up to 30 mL air to be included with no detrimental effect on heating rates; however, even small amounts of entrapped air (<5 mL) degraded heat transfer when processed at low air overpressures (<40 kPa). Processing medium and retort type were important factors in the sensitivity of heating rate to increases of air volumes beyond a threshold value.