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Illumination withering method of black tea

A technology of withering and black tea, applied in the field of tea making, can solve the problems of restricting the development of black tea industry, bitter taste, low aroma, etc., and achieve the effect of enhancing sweetness, reducing bitterness, increasing concentration and persistence

Active Publication Date: 2015-03-25
HUAZHONG AGRI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, no matter which withering method is used, black tea processed from fresh leaves in summer and autumn generally has problems such as low aroma and bitter taste, which seriously restricts the development of the black tea industry.

Method used

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  • Illumination withering method of black tea
  • Illumination withering method of black tea
  • Illumination withering method of black tea

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] A method for black tea light withering, the steps are as follows:

[0021] (1) Fresh leaf raw materials are picked, and the tenderness is controlled within one bud with three or four leaves;

[0022] (2) Spread the fresh leaf raw materials in the withering equipment, the thickness of the spread leaves is ≤10cm, and obtain the spread leaves;

[0023] (3) Use yellow light: wavelength 585 or -590nm, or orange light: wavelength 590 or 600nm, or red light: wavelength 630 or 640nm monochromatic light on the top of the spread leaves to control the light tube and the spread leaves. The surface distance is ≤11cm, the light intensity on the spread leaf surface is ≥220 or 230 or 240Lx, the irradiation time is ≥5 or 67h, the controlled withering temperature is 25 or 27 or 29 or 31 or 33 or -35°C, and the time is 8 or 9 or 10 or 11 or 12h, make its water content to 58 or 60 or 62%, obtain withered leaves;

[0024] (4) Knead (cut) the withered leaves, ferment at a temperature of 30...

Embodiment 2

[0026] Effects of different light quality withering on the quality of black tea

[0027] With one bud and one two leaves of Fuding Dabai tea variety as raw materials, it is operated according to the technological process of withering, rolling, fermenting and drying. Treat with ultraviolet light, yellow light, blue light, orange light, white light (control), purple light, red light, blue light, green light and no light in experimental black tea withering box (tank length 100cm, width 50cm, height 60cm) Withered leaves (Table 1). During the withering process, the light time is 9 hours, the leaves are turned every 1.5 hours to make the light even, and the blowing time is 5-6 hours. The temperature of the withering room is 26°C, and the relative air humidity is 55-65%. After withering, the withered leaves were kneaded and cut 5 times with a rotor crushed red tea kneading and cutting machine (type 6CRQ-20, Fuyang Tea Machinery Co., Ltd.). The fermentation temperature was 30°C, t...

Embodiment 3

[0050] Embodiment 3: the influence of light intensity on the quality of black tea

[0051] With one bud and one two leaves of Fuding Dabai tea variety as raw materials, it is operated according to the technological process of withering, rolling, fermenting and drying. Withered leaves were treated with yellow light in an experimental black tea withering box (the length of the tank body was 100 cm, the width was 50 cm, and the height was 60 cm). During the withering process, the light time is 9 hours, the leaves are turned every 1.5 hours to make the light even, and the blowing time is 5-6 hours. The temperature of the withering room is 26°C, and the relative air humidity is 55-65%. After withering, the withered leaves were kneaded and cut 5 times with a rotor crushed red tea kneading and cutting machine (type 6CRQ-20, Fuyang Tea Machinery Co., Ltd.). The fermentation temperature was 30°C, the relative air humidity was 80% (JFF-400 humidifier, Wuhan Mingyi Technology Co., Ltd....

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Abstract

The invention discloses an illumination withering method of black tea. The illumination withering method comprises the following steps: A, picking fresh leaf raw materials, and controlling the tenderness within three or four leaves on one bud; B, spreading the fresh leaf raw materials in withering equipment under the condition that the leaf spreading thickness is less than or equal to 10cm to obtain spreading leaves; C, irradiating the spreading leaves from the upper side by using monochromatic light such as yellow light with a wavelength of 585-590nm, orange light with a wavelength of 590-600nm or red light with a wavelength of 630-640nm, and controlling a distance between a lamp tube and the surfaces of the spreading leaves to be less than or equal to 11cm, wherein the illumination intensity of the surfaces of the spreading leaves is more than or equal to 230Lx, and the irradiation time is more than or equal to 6 hours; and controlling the withering temperature to be 25-35 DEG C, and controlling the withering time to be 8-12 hours to ensure that the water content reaches 58-62% so as to obtain withered leaves; and D, rolling the withered leaves, fermenting the withered leaves under the conditions that the temperature is 30-32 DEG C and the relative humidity is more than or equal to 95%, and drying under the conditions that the temperature of gross fire is 120 DEG C and the temperature of complete fire is 95 DEG C to obtain a black tea finished product. The illumination withering method disclosed by the invention is feasible, is simple and convenient to operate, and ensures that the black tea is highly-concentrated and lasting in aroma and sweet, pure and fresh in taste, and the quality of the products is significantly superior to that of black tea products processed by a conventional process; and the economic use values of tea leaves can be improved.

Description

technical field [0001] The invention belongs to the technical field of tea making, and specifically relates to a method for withering black tea under light. Background technique [0002] Withering is the first process of black tea processing, which has a great influence on the formation of quality. There are three ways to wither black tea: natural withering, sunlight withering, and withering in a withering tank. Natural withering is to spread the raw materials of fresh tea leaves evenly on a dustpan or bamboo mat and place them indoors. Zhao Hetao (The influence of different withering methods on the quality of black tea, 1994, Guangxi Thermal Technology, Vol53 (4): 56-59), Dong Lianyuan (Talking about solar withering and its economic benefits, 1990, Tea, 3: 27-29) et al. Non-patent literature shows that this method is greatly affected by natural climate such as temperature and humidity, and fresh leaves lose water slowly, and the withering time is long, half of which is mo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A23F3/06
Inventor 余志倪德江陈玉琼张贝贝陈华才封雯廖光伦仇方方
Owner HUAZHONG AGRI UNIV
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