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Title:
FREEZE-DRYING APPARATUS AND FREEZE-DRYING METHOD
Document Type and Number:
WIPO Patent Application WO/2022/175999
Kind Code:
A1
Abstract:
A control unit (21) performs: a gas discharge mitigation treatment, in which a transient response state of a pressure is switched to a low-speed gas discharge treatment to discharge a gas dissolved in a liquid material (M) from the liquid material (M), and in which the temperature of a liquid surface in the liquid material (M) becomes the lowest; a gas discharge enhancement treatment, in which subsequently the low-speed gas discharge treatment is switched to a high-speed gas discharge treatment to adjust the pressure in a container (C) to a pressure of a gas-phase region in a medium and the liquid surface is further cooled to generate ice nuclei in the liquid surface; and a boiling inhibition treatment, in which subsequently the pressure in the container is adjusted to a triple point of the medium or higher to inhibit the generation and growth of bubble nuclei.

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Inventors:
YOSHIMOTO TSUYOSHI (JP)
OHINATA YOICHI (JP)
OZEKI TOMOMITSU (JP)
Application Number:
PCT/JP2021/005602
Publication Date:
August 25, 2022
Filing Date:
February 16, 2021
Export Citation:
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Assignee:
ULVAC INC (JP)
International Classes:
F26B5/06
Domestic Patent References:
WO2020161863A12020-08-13
Foreign References:
JP2020159629A2020-10-01
JP2017508126A2017-03-23
JP2017020738A2017-01-26
Attorney, Agent or Firm:
ONDA Makoto et al. (JP)
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