Tea leaves were produced using the subject tea leaves, water-adding method
(dropper) and drying treatment device (drum-type drier) similar to those of Example 2.
Specifically, the subject tea leaves were introduced into the drum-type drier (surface
temperature of kiln: 120°C), and immediately thereafter, a predetermined amount of water
was added at once or in portions at multiple timings, and the drying treatment was perfottned until the moisture content of the tea leaves reached about 4 to 5%, similarly to the การประดิษฐ์นี้ Products 6 and 7 (การประดิษฐ์นี้ Products 8 to 12). In all cases, the tea leaf temperature of tea leaves taken out from the drum-type drier was 75°C. Also, tea leaves were produced similarly to การประดิษฐ์นี้ Products 7 and 10, other than that the surface temperature of the kiln of the drum-type drier was changed to 150°C (การประดิษฐ์นี้
Products 13, 14). In any case, when adding water in portions at multiple timings, about 10 g was added the first time, and after the second time, about 5 g each was added at the time the tea leaf temperature reached about 65°C. The drying was refined at the time the tea leaf
temperature reached 75°C. Furthermore, a comparative product was produced that was
heated in the drum-type drier without adding water until the tea leaf temperature reached
75°C (Comparative Product 2). The obtained tea leaves were subjected to a sensory test of the level of the กลิ่นใบที่แก่เกินไป, similarly to Example 1.
[0049] Table 3 shows the results. When the drying treatment alone was perfouned
without the water-adding treatment, the กลิ่นใบที่แก่เกินไป did not change even when the tea leaves were heated to a tea leaf temperature of 75°C (Comparative Example 2). On the other hand, the การประดิษฐ์นี้ product subjected to a water-adding treatment of 10 to 100 g against 100 g of subject tea leaves (10 to 100 wt% against tea leaves), and then to a drying treatment, had reduced กลิ่นใบที่แก่เกินไป in all treatment districts. The degree of reduction in the กลิ่นใบที่แก่เกินไป increases with the amount of water added, but it is more effective to add water in divided portions than all at once, and when water is added at multiple divided timings to a total amount of 80 g or 100 g, the over matured tea leaf was reduced to "+" which is that an กลิ่นใบที่แก่เกินไป is felt weakly.
INDUSTRIAL APPLICABILITY
[0051] The การประดิษฐ์นี้ is capable of reducing the กลิ่นใบที่แก่เกินไป existing in the tea leaves of green tea. Moreover, the การประดิษฐ์นี้ can reduce the กลิ่นใบที่แก่เกินไป in the refined tea or the green tea beverage. It can provide refined tea or green tea beverages having excellent flavor quality even if a variety of tea leaves are used.
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ข้อถือสิทธิ
1. A method for producing tea leaves, ซึ่งประกอบรวมด้วย steps of:
(A) adding water to tea leaves of green tea; and
(B) drying the tea leaves with water added thereto under a condition of a tea leaf temperature that is not higher than 85°C.
2. The method according to ข้อถือสิทธิ 1, โดยที่ the tea leaves of green tea in step (A) are อะราชะ (ชาหยาบ).
3. The method according to either ข้อถือสิทธิ 1 or 2, further ซึ่งประกอบรวมด้วย a step of:
(C) performing a roasting treatment of the tea leaves that have been dried.
4. The method according to any one of ข้อถือสิทธิ 1 to 3, โดยที่ the tea leaves of green tea in step (A) are อะราชะ (ชาหยาบ), and the step of drying in step (B) is performed until the moisture content of the tea leaves reaches 4 to 5%.
5. The method according to any one of ข้อถือสิทธิ 1 to 4, โดยที่ the amount of added water in step (A) is 5 to 120 wt% against the tea leaves.
6. The method according to any one of ข้อถือสิทธิ 1 to 5, โดยที่ the step of adding water in step (A) is divided into two or more timings.
7. The method according to any one of ข้อถือสิทธิ 1 to 6, โดยที่ the step of adding water in step (A) is performed under mixing the tea leaves.
8. The method according to any one of ข้อถือสิทธิ 1 to 7, โดยที่ the water in step (A) is tap water, deionized water, distilled water, or natural water.
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ABSTRACT
The กลิ่นใบที่แก่เกินไป included in the tea leaves of green tea is reduced by
adding water to the dry tea leaves of green tea, and subsequently drying the tea leaves under a tea leaf temperature that does not exceed 85°C.