Sterilization of foods packaged in flexible films was investigated employing a pilot-plant retort designed so as to inject superheated steam premixed with compressed air. Uniform tenperature distribution in the retort was obtained during sterilization.
No significant deviation of temperature was found in the retort of which air pressure was kept within 30% of the total pressure. As the result of calculation, 0.2-0.3kg/cmcm
2 superimposed air pressure was suposed to be necessary to prevent the bursting of pouches during heat processing.
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