JPS6398351A - Production of green tea used for packaged green tea - Google Patents

Abstract

PURPOSE:To efficiently produce green tea used for packaged green tea in a short time, by heat-treating raw green tea leaves in steam or hot water, milling and kneading the heat-treated leaves, granulating the resultant green tea mass and drying the granulated mass. CONSTITUTION:Raw green tea leaves which are raw material are treated in steam or boiled in hot water, as desired, cooled and then fed to a stirring and milling device. The resultant milled leaves, as necessary, are dried or stirred while being dried, milled rolled, pressed, kneaded, etc., to give a crushed and finely cut green tea mass in a wet state. The obtained green tea mass is then granulated into grains of such a size as to fall through a wire net having 10-20 mesh size of a sieving machine by a granulating device and dried.

Description

[Detailed Description of the Invention] <Field of Industrial Application> The present invention involves steaming fresh leaves in steam or boiling them in boiling water, then crushing and kneading the resulting tea mass, which is then granulated and dried. The present invention relates to a method for producing green tea for use in charge green tea, which can produce green tea for use in charge green tea in a short time and with a small number of machines with high efficiency.

<Conventional technology> Conventionally, green tea used for charging green tea is produced by a normal tea manufacturing machine, and then passed through a sieve machine using a crusher or the like.
It is used after being crushed to the extent that it can fall through the mesh wire mesh.

That is, the fresh leaves are steam-treated with steam in a steamer, then cooled in a cooler before drying begins, and the first drying process is drying with hot air at 95°C for 45 minutes in a softening machine to reduce the weight of the fresh leaves to 45%. , and then 2
After kneading the tea leaves for 0 minutes to even out the moisture content, they are dried for 40 minutes with hot air at 50'C in a medium-softening machine, which is the second drying process, to 30% of the fresh leaf weight. The tea leaves are heated for 40 minutes to dry to 25% of the fresh leaf weight, and then dried at 80°C in the fourth drying process.
By drying for 30 minutes with hot air of
%. Therefore, using a total of five machines, four dryers and one twister, it took 175 minutes to complete the production of tea leaves, which were then further crushed and sieved using a crusher. The company produces green tea for use in green tea.

<Problem to be solved by the invention> Tea is a luxury item, and the quality of tea should be determined by the aroma, flavor, hue, and transparency of the liquid that is soaked in hot water. Prices are also influenced by shape and color, so in conventional tea manufacturing and drying methods, the drying speed is consciously slowed down to create the unique acicular shape of tea, and it takes a long time to produce several types of tea. The tea is processed using a dryer, and the green tea used for charging green tea is crushed by a grinder. This creates the absurdity of pulverizing them.

<Means for Solving the Problems> The present invention aims to produce green tea that can be used in green tea from the beginning, without being concerned about the external shape or color, and which can be used in hot water at the time of tea ceremony. The aroma of the liquid leached out by soaking it in
Green tea with good flavor, color, and transparency is produced in a short time and with a small number of machines with high efficiency, and the granulation device is used to granulate it into a shape that can fall through a wire mesh of 10 to 20 meshes of a sieving machine, and then dried. This is a method for producing green tea to be used for charging green tea, which has the characteristic that it can be used for charging green tea without pulverizing it.

<Operation> Fresh leaves, which are raw materials for tea, are steam-treated in steam or boiled in hot water, or fresh leaves are steam-treated in steam or boiled in boiling water, cooled, and then fed to a stirring and crushing device. By subjecting the raw material tea leaves to various actions such as stirring, crushing, rolling pressure, kneading, and mixing, the tea leaves are crushed and shredded, and the tissue is destroyed and the juice inside the tea leaves exudes into tea lumps. becomes wet. Next, the particles are granulated in a granulator to the extent that they fall through a wire gauze of 10 to 2 o mesh in a sieving machine, and dried in a dryer to produce green tea to be used as a charging green tea.

If the wet tea mass processed by the stirring and crushing device has a high moisture content, it is suitable for granulation by drying it before feeding it to the stirring and crushing device, or by drying it while processing with the stirring and crushing device. The tea mass is made into a wet tea mass with a high moisture content.

After granulation, the particles are uniformed using a sieve to make the subsequent drying process better and more uniform.

<Example> To explain the present invention based on the drawings, fresh leaves, which are raw materials for tea leaves, are washed in a washing tank 1 and then put into a boiling tank 2.
The tea leaves are boiled for 1 minute and 30 seconds in boiling water at a temperature of 60°C to sterilize them, lose the activity of oxidizing enzymes, remove grassy odor, cool the tea leaves in a cooler 3, and then put them into a dryer 4 where they are exposed to hot air at 60°C. Dry while spraying and stirring to remove moisture adhering to the surface. When the moisture content reaches 80%, stir and crush the surface w5.
=4-.

The tea leaves put into the stirring and crushing device 5 are subjected to various actions such as stirring, crushing, rolling pressure, kneading, and mixing by the stirring and crushing rod, so that the tea leaves are gradually crushed and shredded and their tissues are destroyed. The tea mass becomes a wet tea mass due to the juice inside the tea leaves being infused, and the operation is continued until all the tea leaves are crushed and shredded into pieces of 5 m square or less.

When the stirring and crushing device W5 is operated for a longer time, the crushed fragments become smaller and the degree of destruction of the tissue increases.The astringency of the liquid leached from soaking tea leaves in hot water during tea drinking decreases and the color becomes darker. The transparency also decreases, resulting in turbidity and exhibiting the characteristics of "deeply steamed tea." Conversely, when the operation time of the stirring and crushing device 5 is shortened, the crushed fine fragments become coarser and the degree of tissue destruction decreases. When tea leaves are soaked in hot water during a tea ceremony, the infused liquid becomes more astringent, the color becomes paler, and the clarity increases, giving it the characteristics of ``young steamed tea.''

The wet tea mass discharged from the stirring and crushing device 5 is fed into a granulating device 6 and granulated into particles that can fall through a wire mesh with a mesh size of 10 to 2 degrees. The sieved fine particles and coarse particles are fed into the granulator 6 again, and particles of appropriate size are dried in the dryer 8 to produce green tea with a water content of about 8% for use in charging green tea.

Steamed tea leaves obtained by steaming raw tea leaves in steam can also be used to produce green tea for use in green tea charging by the above-mentioned production process.

In the stirring and crushing device 5, hot air is supplied to the tea leaves stored inside the tea leaves, and the tea leaves may be dried while being stirred and crushed.Also, the sieving device 7 may not be used, but coarse particles will be removed from the moisture inside during drying. The residue causes stuffiness, produces a strange odor, and impairs the color of the water during extraction.

<Effects of the invention> When producing green tea for use in 50 kg of packed green tea using fresh leaves using current tea making equipment, the tea making process requires about 3 to 4 hours, and the dried tea leaves are passed through the sieving machine for about 10 to 20 hours. It takes about 1 hour to crush the particles into particles that can fall through the wire mesh of the mesh, which takes a total of 4 to 5 hours, but according to the method for producing green tea used for the charged green tea according to the present invention, it takes 1 to 5 hours.
Since it can be completed in two hours, it can be manufactured in a short time and with a small number of machines with high efficiency, and it also reduces manufacturing costs in terms of fuel costs, power and heating costs, labor costs, cost depreciation costs, etc. It is.

[Brief explanation of the drawing]

FIG. 1 shows a manufacturing process diagram of green tea used in the packed green tea according to the present invention. 1...Washing tank 2...Boiling tank 3...Cooling machine 4
... Dryer 5 ... Stirring and crushing device 6 ... Granulation device 7 ... Sieving machine 8 ... Dryer

Claims (4)

[Claims] (1) Wet tea leaves that have been mashed or kneaded after steaming fresh tea leaves in steam or boiling in hot water, or after cooling fresh tea leaves by steaming them in steam or boiling them in boiling water. A method for producing green tea used for packed green tea, which comprises granulating and drying the green tea. (2) A method for producing green tea to be used in the packed green tea according to claim 1, which comprises drying the tea leaves and then crushing and kneading them. (3) A method for producing green tea to be used in the packed green tea according to claims 1 and 2, which comprises crushing and kneading while drying. (4) A method for producing green tea for use in bagged green tea according to claims 1, 2, and 3, which comprises sieving and drying after granulation.