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Method and apparatus for cryogenic fast freezing preservation and refrigerating dry of Chinese medicines and food

A technology of ultra-low temperature quick-freezing and sublimation drying, which is applied in the fields of food preservation, traditional Chinese medicinal materials, and drying. It can solve the problems of high price of Chinese medicinal materials and food, complex equipment structure, and unfavorable wide application. It achieves high degree of automation, simple equipment structure, Effective use of high efficiency

Inactive Publication Date: 2003-09-03
BEIHANG UNIV
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Problems solved by technology

[0003] However, since the currently used freeze-drying method mainly adopts liquid nitrogen quick-freezing and vacuum drying, the equipment structure is complex, the cost is high, the energy consumption is large, and the processing time is long, so that the price of Chinese medicinal materials and food processed by this method is relatively high. , which is not conducive to the widespread use of

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  • Method and apparatus for cryogenic fast freezing preservation and refrigerating dry of Chinese medicines and food
  • Method and apparatus for cryogenic fast freezing preservation and refrigerating dry of Chinese medicines and food
  • Method and apparatus for cryogenic fast freezing preservation and refrigerating dry of Chinese medicines and food

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Embodiment Construction

[0025] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

[0026] The present invention is a method for ultra-low temperature quick-freezing preservation and freeze-sublimation drying of Chinese medicinal materials and food. The following procedures are used for quick-freezing preservation and ultra-low temperature drying:

[0027] (a) Classify and screen items, and classify and screen items according to the items required for quick freezing;

[0028] (b) Wash and let the surface dry naturally;

[0029] (c) pack into the quick-freezing low-temperature drying box;

[0030] (d) Select different index numbers according to different item settings: under normal circumstances, the quick-freezing fresh-keeping temperature is -80°C to -90°C, and the time is 20 to 30 minutes; the low temperature freeze-drying temperature is -5°C to -6°C, and the time is 8 to For 10 hours, the dew point temperature of the dry...

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Abstract

A process for antistaling and drying the Chinese-medicinal materials or food features that an air turbine with reflux condenser is used for refrigerating, which can quickly freeze the Chinese-medicinal materials or food for antistaling them, and said drying them features the direct sublimation. Its advantages are no damage to cell membrane, very low water content, and long storage period.

Description

technical field [0001] The present invention relates to a treatment method for fresh-keeping and drying of Chinese herbal medicines and food, and more particularly refers to a method for ultra-low-temperature quick-freezing and freeze-sublimation drying of Chinese herbal medicines and food by adopting air turbo expansion refrigeration technology with back cooling Method and device thereof. Background technique [0002] Freeze-drying technology is a method in which a water-containing object is quickly frozen, and then the ice is sublimated in a vacuum state to dry the object. The tissue structure of medicines, food and other products processed by freeze-drying technology will not be damaged, and the nutrients will not be lost or changed, and there will be no pollution from any chemical preservatives. After sealing, they can be stored at room temperature for more than one year. For freeze-dried food, before eating, immersing the product in water ca...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A23B7/024A23L3/44F25B11/02
CPCF25D2400/30
Inventor 刘思永王屏方祥军
Owner BEIHANG UNIV
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