JPS63133943A - Preparation of granular oolong tea - Google Patents

Abstract

PURPOSE:To prepare oolong tea having excellent flavor, taste and color, in a short time in high efficiency, by granulating wet tea leaves, withering the granules and drying the product. CONSTITUTION:Raw leaves of tea are washed with water in a washing tank 1, centrifuged and dehydrated by a dehydrator 2, charged into a 1st withering apparatus 3 to evaporate preferably 10-20wt% water, transferred to a grinding and kneading apparatus 4, subjected to stirring, rolling, mixing, etc., to obtain wet tea leaves and crushed and cut to preferably <=5mm cube. The cut leaves are charged into a granulator 5, granulated to granules of preferably 5-10mm in diameter, transferred to a 2nd withering apparatus 6 to effect the fermentation of the surrounding part of the tea leaves and finally dried in a drier 7 to obtain the objective oolong tea having a water-content of preferably about 8%.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a method for producing granular oolong tea by granulating it.

<Prior art> There is no technology to produce granular oolong tea by withering granulated tea leaves, and the usual method for producing oolong tea is to expose fresh leaves to sunlight and wilt them for 30 to 60 minutes, or to use a withering machine. artificially wither the fresh leaves to evaporate the moisture and reduce the weight by 10%.
After reducing the tea leaves to ~20%, indoor withering is performed for 4 to 7 hours to moderately ferment the fresh leaves, giving them both the light blue color of black tea and the flavor of green tea.Then, the activity of oxidative enzymes in the tea leaves is lost by kamairi operation using high heat. Oolong tea is produced by rolling it in a rolling machine and then drying it. When oolong tea is used as a raw material for oolong tea packed in teabags, etc., the oolong tea produced by the above method is crushed with a crusher, sieved with a sieve, and reprocessed to a size between 5 and 10 mesh before use. There is.

Problems to be Solved by the Invention In the present invention, 1. In addition to the usual infusion method, oolong tea is produced in the form of granules for the purpose of use in packed oolong tea, etc. Without being taken in by the shape or color of the
To produce oolong tea in a short time and with high efficiency, with good aroma, flavor and color of the infused liquid exuded into hot water during drinking, and to granulate it into granules with a diameter of 5 to 10 m using a granulating device, wither and ferment. This is a method for producing granular oolong tea that can be used as a raw material for charged oolong tea without pulverizing.

Measures to solve the problem 〉 Fresh tea leaves, which are the raw material for oolong tea, can be used as they are, or after their weight has been reduced by 10 to 20% using sun-dried withering or a withering machine.
Pelletized after gentle kneading using a gentle kneading device, diameter 5~
To produce granular oolong tea which can be used as a raw material for charged oolong tea in addition to the usual infusion method by withering and moderately fermenting granular tea leaves of 10II111.

〈Effect〉 Fresh tea leaves can be grown as is or by spreading them on trays at a rate of about 2 kg per leaf and exposing them to direct sunlight to evaporate the moisture in the fresh leaves, or by artificial withering using a withering machine.
The tea leaves, which have been withered by reducing their weight by ~20%, are fed to a gentle kneading device, which applies various actions to the tea leaves, such as stirring, crushing, kneading, kneading, and mixing, to crush the tea leaves into fine pieces. When the tea leaves are cut, a part of the tissue is destroyed and the juice inside the tea leaves exudes to form a moist tea mass, which is then granulated into particles with a diameter of 5 to 10 W+ by a granulator. The granulated particles are left stationary in a room with appropriate ventilation, temperature, and humidity, and by indoor withering or artificial withering using a withering machine, fermentation around the tea leaf particles is promoted and fermentation in the center is suppressed. Granular oolong tea is produced by completing the withering process and drying, which allows the light blue color of black tea to coexist with the flavor of green tea.

<Example> The present invention will be explained based on FIG. 1. Fresh leaves, which are raw materials for tea leaves, are washed with water in a washing tank 1 to remove foreign substances, and then transferred to a dehydrator 2.
and centrifugally dehydrated to remove moisture adhering to fresh leaves.

Next, the fresh leaves may be directly fed into the warming kneading device 4, but in this embodiment, they are fed into the first withering machine 3, which corresponds to sun-dried withering, to evaporate the water content of the tea leaves through appropriate withering. After reducing the weight by ~20%, it is put into the crushing and kneading device 4.

Shake down kneading clothes! ! In step 4, when various actions such as stirring, gentleness, pressure, kneading, and mixing are applied, the tea leaves are gradually crushed and shredded, and a part of the tissue is destroyed and the juice inside the tea leaves exudes, leaving the tea leaves in a moist state. The operation is continued until tea leaves are formed and all the tea leaves are crushed and shredded into pieces of less than 5 ounces.

The wet tea mass discharged from the warming kneading device 4 is put into the granulating device 5 and granulated into particles with a diameter of 5 to Low.
The withering machine 6 performs a moderate second withering, which corresponds to indoor withering, to promote fermentation around the tea leaves and suppress fermentation in the center, allowing the light blue color of black tea and the flavor of green tea to coexist and finish withering. do. After finishing the withering process, the tea leaves discharged from the second withering machine 6 are dried by a drier 7 to produce granular oolong tea with a water content of about 8%.

Effects of the invention 〉 When producing oolong tea for use in oolong tea for tea bags etc. using the current production method, it takes about 6 to 9 hours to produce oolong tea, and it takes about 1 hour to crush the finished oolong leaves. It takes approximately 7 to 10 hours of work time in total.

If the granular oolong tea according to the present invention is used as a raw material for charging oolong tea, the production of granular oolong tea with a diameter of 5 to 10 loaves can be completed in 3 to 4 hours, in a short time and with high efficiency. In addition to reducing the manufacturing cost in all aspects such as fuel costs, power and heating costs, labor costs, and depreciation costs. In addition, part of the epidermis and tissue of the tea leaves are destroyed by the warming kneading device, and the resulting particles are fruit-like, making it a granular oolong tea with excellent infusion properties. In addition to its usage, it can also be used as a raw material for packed oolong tea,
It has a wide range of uses, such as canning the infused liquid from hot water or drying it into powder as a raw material for instant oolong tea.

[Brief explanation of the drawing]

FIG. 1 shows a process diagram for producing granular oolong tea according to the present invention.

Claims (2)

[Claims] (1) A method for producing granular oolong tea, which is characterized in that wet tea leaves obtained by crushing and kneading fresh or withered tea leaves are granulated, then withered, moderately fermented, and dried. (2) The method for producing granular oolong tea according to claim 1, characterized in that it is granulated into particles with a diameter of 5 to 10 mm.