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Microwave and hot air combined water removing method for green tea

A technology of deenzyming and microwave, which is applied in the direction of tea treatment before extraction, can solve the problems of insufficient volatilization of aroma substances with low boiling point, insufficient heat effect of microwave deenzyming, etc. The method is simple, easy to manufacture, and the time for degreening is short. Effect

Inactive Publication Date: 2012-07-04
YANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the thermal effect of microwave deenzyming is not fully carried out, and the low-boiling point aroma substances are not volatilized enough, and the purpose of establishing the basic quality characteristics such as taste and aroma of tea leaves by degreening has not been achieved.

Method used

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  • Microwave and hot air combined water removing method for green tea

Examples

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Effect test

Embodiment 1

[0017] A method for combining green tea with microwave and hot air, comprising the following steps:

[0018] (1) Use young tea buds or leaves that meet the picking standards and have a certain degree of tenderness as fresh tea leaves, and spread the fresh tea leaves in a cooling trough to cool them. The thickness of the fresh tea leaves is 3-5cm. Cooling time is 4-6 hours, stir once every two hours, when the water content of the fresh tea leaves is 65%-70%, the leaves are soft and fragrant, the green leaves are ready to be taken out;

[0019] (2) Use a microwave and hot air combined greening machine to kill the green leaves after cooling, first turn on the hot air switch, and preheat the hot air temperature at 20-160°C;

[0020] (3) When the temperature of the green machine cavity reaches the preset temperature, start to put in the green leaves to be fixed, and at the same time turn on the microwave switch, adjust the microwave power to 0-2000W; spread the green leaves to be f...

Embodiment 2

[0025] A method for combining green tea with microwave and hot air, comprising the following steps:

[0026] (1) Fresh tea leaves are used as raw materials, and the picking standard is mainly 1 bud and 2 leaves, as well as pairs of leaves with the same tenderness. Put the fresh tea leaves in a cooling tank to cool them. The time is 5 hours, and it is stirred once every two hours. When the water content of the fresh leaves is 68%, the leaves are soft and fragrant, the fresh leaves are taken out, and the leaves are ready to be greened;

[0027] (2) Use a combination of microwave and hot air to fix the greens, first turn on the hot air switch, adjust the temperature of the hot air to 50°C, and preheat;

[0028] (3) When the temperature of the greening machine chamber reaches 50°C, start to put in fresh leaves, and spread the fresh leaves on the conveyor belt of the greening machine. At the same time, turn on the microwave switch, adjust the microwave power to 1400W, and adjust t...

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Abstract

The invention discloses a microwave and hot air combined water removing method for green tea and belongs to the technical field of tea water removal. The method comprises the following steps that: (1) fresh tea leaves are placed in a spreading drying groove for spreading drying until the moisture content of the fresh tea leave is 65 percent to 70 percent; (2) a microwave and hot air combined water removing machine is adopted for carrying out water removal on leaves requiring the water removal after the spreading drying, a hot air switch is switched on, the water removing machine is preheated,and the hot air temperature is regulated to 20 to 160 DEG C; and (3) after the temperature of a cavity of the water removing machine reaches the preset temperature, the leaves requiring the water removal are started to be put into the cavity, simultaneously, a microwave switch is switched on, the microwave power is regulated to 0 to 2000W, the leaves requiring the water removal are flatly paved on a transmission belt of the water removing machine, the water removal leaves put into the cavity of the water removing machine are heated for 0.5 to 10 minutes, and the water removing leaves after the water removal are subjected to subsequent processing. The process is simple, the water removing time is short, and the contents of moisture, tea polyphenol, free amino acid and ascorbic acid in the prepared water removing leaves are respectively and obviously improved.

Description

technical field [0001] The invention relates to a method for greening green tea, in particular to a method for green tea combined with microwave and hot air, and belongs to the technical field of green tea greening. Background technique [0002] Tea fixation refers to destroying and passivating the oxidase activity in fresh tea leaves by high temperature, inhibiting the enzymatic oxidation of tea polyphenols in fresh leaves, preventing the leaves from turning red, evaporating the water in fresh leaves, and making the tea leaves soft and easy to knead It is a tea-making step that promotes the formation of a good aroma while emitting green odor while forming. Fresh tea leaves must be greened to have a unique aroma and color. Finishing plays a decisive role in the quality of green tea. [0003] The production of tea has obvious seasonality. After the fresh leaves are picked, they must be greened within a relatively short period of time, otherwise they are easily affected by ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A23F3/06
Inventor 汪志君葛庆丰张聪方维明于海
Owner YANGZHOU UNIV
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