JPH1099021A - Extraction method for swelling material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To extract a material swelling during the extraction of green tea, black tea and oolong tea, etc., while smoothly transferring it. SOLUTION: By an extraction device 1 for which the pitch of the screw 11 of an extracted object transfer machine 3 is gradually enlarged along the flowing direction of an extracted material and a small hole 13 for passing through extraction water and not passing through the extracted material is formed on the screw 11, the extracted material to swell as extraction time elapses is extracted. The extracted material is smoothly transferred.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for extracting a substance which swells in the course of extraction.

[0002]

2. Description of the Related Art The applicant of the present invention has applied for a "continuous swelling device" (Japanese Patent Publication No. 6-50972) and obtained a patent. This device prevents the compressive destruction of the grains by swelling the grains by forming the blades of the screw conveyor for transferring the granules into a perforated plate shape and gradually increasing the pitch thereof, thereby preventing the granules from being compressed. This is an apparatus configured to obtain high quality swollen granules.

[0003]

On the other hand, the inventor of the present application has
Green tea, black tea, and tea leaves such as oolong tea, or when examining the extraction of substances that swell when extracting bonito shavings, etc., the device can adjust the extraction time, or can respond to the swelling of the substance to be extracted, Moreover, it was found that the separation of the extracted cake was easy.

[0004]

The present invention is based on this finding, and the pitch of a screw of a substance to be extracted is gradually increased along the flow direction of a substance to be extracted, and water is extracted from the screw. A method for extracting a swelling substance, characterized in that a substance to be extracted swells as the extraction time elapses with an extraction device in which a small hole is formed to allow the substance to be extracted and not pass the substance to be extracted.

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION In the present invention, examples of the swelling substance, that is, the substance to be extracted include tea leaves of teas such as green tea, black tea, and oolong tea, and bonito shavings and the like. However, those which swell with the passage of the extraction time are targeted. That is, this swelling is absorbed by the expansion of the screw pitch in the "continuous swelling device". Water (hereinafter referred to as "extracted water") is used as an extraction medium for the extract from the substance to be extracted.
Is preferable, and depending on the substance to be extracted from the viewpoint of efficiency,
Hot water at ~ 98 ° C is suitable. The contact condition between the extraction water and the substance to be extracted is, for example, a condition as shown in Table 1 below.

[0006] * Extraction water temperature: temperature immediately before contact with the substance to be extracted

An apparatus suitable for carrying out the method of the present invention will be described below with reference to the accompanying drawings. 1 to 3, an extraction apparatus 1 includes a main body 2 that forms a tank whose cross section in a direction perpendicular to an axis has a U-shape, an extractant transfer device 3 that transfers an extractable substance, for example, tea leaves, and a cover of the main body 2. An extractor inlet 5 is formed on one side of the cover 4, and the extractor transporter 3 is connected to an end wall 6 of the main body 2.
Is rotatably supported. And the extract 5
An extract outlet 7 is provided on the side wall of the main body 2 in the vicinity, and an extract inlet 8 and an extract cake outlet 9 are provided on the other side wall.
Are provided respectively. With respect to the positional relationship between the extract inlet 8 and the extract outlet 7, as shown in FIG.
Is provided lower, and the extraction water is configured to flow from the extraction liquid inlet 8 to the extraction liquid outlet 7 due to the head difference.

[0008] The extractor transfer machine 3 comprises a shaft 10 and the shaft 1
0, and is constituted by a screw 11 provided in a helical shape.
It is sent in the opposite direction to the flow of the extract. Reference numeral 12 denotes a cake discharging machine which is provided on the shaft 10 and includes flat blades 12a.
Has the effect of leading to Screw 1 of extractor transfer machine 3
The pitch of 1 gradually expands halfway in the transfer direction of the substance to be extracted, and thereafter is constant in accordance with the immediately preceding maximum pitch. The screw 11 is provided with a number of small holes 13 for allowing extraction water to pass therethrough, and the diameter of the small holes is determined so that the substance to be extracted cannot pass therethrough. For example, 1.2 to 3.0 mm for green tea and 1.5 to 3.5 m for black tea
m, 1.5 to 4.0 mm for oolong tea, and 1.5 to 4.0 mm for bonito shavings. Small hole 1
The opening ratio of 3 is represented by (sum of the areas of the small holes 13 per unit area) / (unit area), and is, for example, 0.15 to 0.5 for green tea and 0.15 for black tea. ~ 0.55,
It is preferably 0.2 to 0.55 for oolong tea, and 0.15 to 0.55 for bonito shavings.

Reference numeral 14 denotes a jacket for keeping the temperature of the extraction water constant. Next, FIG. 4 shows an example in which the extraction devices 1 are arranged in a U-shape in two stages in series. In FIG. 4, reference numeral 15 denotes a flow path for extracted water and a substance to be extracted. In this embodiment, the main body provided with the substance to be extracted 5, that is, the upstream side of the flow of the substance to be extracted is referred to as 16, and the downstream side thereof is referred to as 17, and the pitch of the screw 11 is gradually reduced toward the downstream side as described above. For example, it is increased to the middle position of the main body 17, and thereafter, it is kept constant according to the immediately preceding maximum value. The extractor transfer machine 3 is driven to rotate synchronously with a chain and a sprocket. Next, the embodiment shown in FIG. 5 is a modified embodiment of the embodiment shown in FIG. 4, and is an example in which the to-be-extracted material inlet 5 and the extracted cake outlet 9 are installed adjacent to each other. The body provided with the to-be-extracted material inlet 5 and the extracted cake outlet 9 is referred to as 18, and the other is referred to as 19, and the inlet 5 and the outlet 9 are provided with the extract inlet 8 at the end of the body 19, for example, the left end in FIG. Are provided with extract outlets 7 respectively. Numerals 20 and 21 denote transfer machines consisting of flat blades 22 and 23 for transferring the substance to be extracted from the main body 18 to the main body 19 or from the main body 19 to the main body 18.
Is a lees discharger similarly composed of flat blades 25.

[0010]

【Example】

Example 1 This example is performed by the apparatus shown in FIG. 4, and the specifications of the equipment are as follows.・ Total length of extractor transfer machine: 8m (4m / tank x 2)
・ Screw diameter: 450 mm ・ Screw opening ratio: 0.4 ・ Screw hole diameter: 3.0 mm ・ Screw pitch: 200 to 400 mm ・ Expansion of the screw pitch depends on the material to be extracted. Was made 70% of the total length. First, the extraction water heated to 70 ° C. is continuously supplied from the extraction liquid inlet 8 at a rate of 4.5 kl / hr. On the other hand, tea leaves of black tea as the substance to be extracted were similarly continuously supplied at a rate of 200 kg / hr from the substance to be extracted inlet 5, and brought into contact with extraction water for 15 minutes to obtain Brix 2.0 extracted tea. The temperature of the extracted tea at the extract outlet 7 was 69 ° C. Note that the jacket 14 was heated to maintain the temperature of the extraction water.

Embodiment 2 This embodiment is carried out by using the apparatus shown in FIG. 4, and the specifications of the equipment are the same as those in Embodiment 1 described above. First, extraction water heated to 90 ° C. is continuously supplied at a rate of 4.5 kl / hr from the extraction liquid inlet 8. On the other hand, tea leaves of oolong tea, which is the substance to be extracted, are similarly continuously supplied at a rate of 150 kg / hr from the substance to be extracted inlet 5 and brought into contact with extraction water for 9 minutes to give Brix 1.5.
The extracted tea was obtained. The temperature of the extracted tea extract at outlet 7 is 89
° C. In the same manner as in Example 1, the jacket 14 was heated to maintain the temperature of the extraction water.

[0012]

According to the present invention, the extraction operation can be carried out efficiently even with a substance which swells by extraction, and the extraction time can be freely adjusted because of the screw transport, and the extraction residue can be easily separated.

[Brief description of the drawings]

FIG. 1 is a perspective view of an extractor.

FIG. 2 is an enlarged perspective view of a screw.

FIG. 3 is a front view of the extractor.

FIG. 4 is a diagram showing another embodiment of the extractor.

FIG. 5 is a diagram showing another embodiment of the extractor.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Extractor 2 Main body 3 Extractor transfer machine 5 Extracter inlet 7 Extract outlet 8 Extract inlet 9 Extract cake outlet 11 Screw 13 Small hole 12 Cake discharge machine 20,21 Transfer machine

Claims (1)

[Claims] The pitch of a screw of a substance to be extracted is gradually increased along a flow direction of a substance to be extracted, and a small hole is formed to allow water to be extracted through the screw and not to pass the substance to be extracted. A method for extracting a swelling substance, comprising extracting a substance to be extracted that swells as the extraction time elapses with the extracted apparatus.