Compression of foods during freeze-drying: water plasticization at the ice-dry layer interface.

Abstract:

:The compressive mechanical properties of freeze-dried green beans show a pronounced decrease in rigidity when moisture content and/or temperature are increased. There exist several temperature and moisture combinations which give common values for mechanical properties. These combinations also give a common compressive behavior. Using this information on mechanical properties, it is possible to predict a stress-strain relationship, if given either a temperature, a moisture content, or the value of a pertinent mechanical property. It is shown that the moisture contents and temperatures that exist in the dry layer during freeze-drying result in mechanical properties that are suitable for compression of the dry layer. From studies on compression behavior during freeze-drying, it is shown that applied compressive pressure is the main determinant of final degree of compression. Increasing the compressive pressure gave a higher compression effect and gave a more rapid drying, presumably due to improved heat transfer in the compressed dry layer. From the above information, a simple method to predict compression behavior during freeze-drying was developed.

journal_name

Adv Exp Med Biol

authors

Emami C,Flink JM

doi

10.1007/978-1-4899-0664-9_40

subject

Has Abstract

pub_date

1991-01-01 00:00:00

pages

721-37

eissn

0065-2598

issn

2214-8019

journal_volume

302

pub_type

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