Defreezing method and its device

Abstract

The temperature or pressure in a thawing zone 2 is controlled to a preset level in a thawing process to perform the thawing of an object 1 with low-pressure steam in the thawing zone 2 by evacuating the thawing zone 2 under controlled evacuation speed while supplying steam to the thawing zone 2. The subject thawing apparatus is provided with a steam supplying means 3 to supply steam to the thawing zone 2, an evacuation means 4 to evacuate the thawing zone 2, a detection means 7 to detect the temperature or pressure in the thawing zone 2 and a controlling means to adjust the value detected by the detection means 7 to be equal to a preset level by intermittently operating the evacuation means 4 while supplying steam by the steam supplying means 3.

Description

technical field

[0001] The invention relates to a so-called vacuum steam thawing method and its device for thawing objects to be thawed with low-pressure steam in a thawing area. Background technique

[0002] The vacuum steam thawing is that when the object to be thawed is put into a container filled with low-pressure saturated steam whose pressure is lower than atmospheric pressure, the steam condenses on the surface of the object to be thawed, so that the object to be thawed can obtain a large amount of latent heat of condensation generated at this time, Patent Document 1 discloses a thawing method for thus thawing the object to be thawed.

[0003] As such a vacuum steam thawing method, in order to realize high-quality thawing, it is important to finely and accurately control the temperature or pressure in the thawing chamber.

[0004] In order to achieve this purpose, it is necessary to maintain a predetermined low pressure in the thawing chamber by decompression means, ...

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