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KMID : 0380619880200030350
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Korean Journal of Food Science and Technology
1988 Volume.20 No. 3 p.350 ~ p.356
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Modification of Conventional Freeze Dryer
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Abstract
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A pilot plant scale freeze dryer was designed and manufactured and its performance was tested. Freezing capacity of water vapor in the developed freeze dryer was 8㎏/batch and heating and defrosting methods were conduction and hot gas types, respectively. And exhausting time of vacuum pump was 7-8 minutes and temperature of cold trap was kept below -50℃. In the freeze drying of fruits and vegetables, its optimum and maximum drying capacities were 2 and 4㎏/batch, respectively. Performance of the new freeze dryer was compared quite well with a foreign-made freeze dryer.
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