JP2001292717A - Method for separating cotyledon and testa from soybean grain and device for fractionating and collecting the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for separating cotyledons and testae from soybean grains, by which the testae can be peeled off from the soybean grains without affecting the compositions of the cotyledons and defecting the shapes of the cotyledons. SOLUTION: This method for separating the cotyledons and the testae from the soybean grains, characterized by allowing water-swollen soybean grains to flow together with the water into rotation rollers 5, 6 which are disposed in a mutually facing state and rotated in mutually inward directions at a desired distance, and then picking the testae from the soybean grains by the nipping pressure friction resistance of the soybean grains with both the rotation rollers 5, 6. In addition, the device for fractionating and collecting the peeled testae, cotyledons and hypocotyls is provided.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for separating cotyledons, seed coats and hypocotyls from soybean grains mainly used for natto and a peeling apparatus therefor. The soybean seeds are spherical or slightly longer spherical with a pair of hemispherical cotyledons wrapped in the seed coat, and the cotyledons have hypocotyls. , Hypocotyls and cotyledons.

[0002]

2. Description of the Related Art Conventional soybean natto is obtained by drying soybean grains and mechanically breaking the whole soybeans by using a crushed soybean. However, the particles vary in size and cause uneven absorption of water, uneven cooking, and uneven fermentation. There is a drawback that the storage life and the generation of ammonia come out quickly. Furthermore, a method of heating and then molting to peel off the seed coat has been attempted. However, heating has caused thermal denaturation of the protein, and components have been washed away in the immersion water during immersion, resulting in a product having a poor taste. Therefore, techniques for peeling the seed coat from grain have been conventionally considered. For example, JP-A-61-293362 describes that soybeans are immersed in an aqueous solution of fruit juice, boiled in the same solution until the seed coat is loosened, then rinsed with cold water, and stirred until the seed coat is peeled off. Other technologies use fibrinolytic enzymes,
The use of alcohols and rapid cooling to reduce denaturation of soybean protein after heat treatment are used to separate the seed coat. Japanese Patent Application Laid-Open No. 11-113521 is one of the mechanical seed coat peeling techniques. This supplies soybeans fixed to the rotating drum and swollen with water between the uneven bodies,
The twisting force is applied to the soybean by the peripheral speed difference between the rotating drum and the uneven body, and the soybean is to be peeled. In this method, since the rotating drum faces the fixed uneven body, a stress is applied to remove not only the soybean seed coat but also the hypocotyl.

[0003] According to these prior means, upon peeling the seed coat from soybean seeds, the composition of the cotyledon such as proteins and oils and fats is affected, the cotyledon is lost, and the cotyledon has a round hemispherical shape. Problems such as spoiling the form were inherent.

[0004]

DISCLOSURE OF THE INVENTION The present invention is intended to separate the seed coat and the hypocotyl from the grain without affecting the composition of the cotyledon and without losing the morphology of the cotyledon.

[0005]

According to the present invention, there is provided a method for removing seeds, comprising the steps of: dropping soybean grains sufficiently swollen with water between opposed rotating rollers rotating inwardly; By the friction and resistance of the soybeans, the seed coat is peeled from the soybean grains as if pinching the soybean grains with fingertips and pushing the cotyledons out of the skin.

The apparatus for separating seed coat and the apparatus for separating and separating seed coat, hypocotyl and cotyledon from each other in the present invention are provided with a rotating roller covered with an elastic material at an interval capable of sandwiching swollen soybean grains swollen. It consists of a peeling device, a seed coat collecting scraper at the top of the pressurized water tank into which compressed air was sent following the water tank, and a flotation separation tank using a specific gravity difference with a cotyledon collecting screw conveyor at the bottom. I have.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The rotating rollers of the peeling apparatus may be provided with a difference in peripheral speed by providing a difference in diameter, and may be provided with a difference in rotation speed even if they have the same diameter. The peripheral surface of the rotating roller is made of an elastic material such as synthetic resin silicon, and can be replaced with a water-resistant and abrasion-resistant material. The air to be injected into the flotation / separation tank only needs to have a pressure sufficient to cause the seed coat having a very small specific gravity to float by the generated bubbles.
As a result, cotyledons with a large specific gravity sink.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The flow of grains in the apparatus of the present invention will be described. As shown in FIG. 1, the grains swollen with water are sent to a separation apparatus A together with water by a transport pipe 1 to collect water, and the swollen grains are collected. To the hopper 2 and from the chute 3 to the peeling device B. In the peeling apparatus B, the seeds are separated into seed coats and cotyledons, and both are transferred to the floating separation tank C by the transport pipe 4 as shown in FIG. 2 by a water supply means (not shown) to remove the seed coats and fall off the cotyledons. The separated hypocotyls are separated and cotyledons are collected.

[0010] As shown in Fig. 1, the peeling apparatus B is composed of rotating rollers 5 and 6 having silicon rubber provided on the surface thereof so as to sandwich soybean grains wet and expanded with water. It is rotatably supported at a certain interval, and each of them is driven to rotate inward by a power machine 7 in an inward direction indicated by a mutual arrow.
A vibrating feeder (known) installed above the rotating rollers 5 and 6 causes the swollen grains to flow down smoothly through the chute 3 between the rotating rollers 5 and 6 while being separated by vibration. When the soybean grains are swollen, the gaps between the cotyledons are filled by absorption and expansion of moisture, dissociation between the cotyledons is smoothly performed, and loss of the cotyledons during the dissociation can be prevented.

The swollen grain is supplied between the rotating rollers 5 and 6 from the chute 3 together with the running water to prevent the grain from being thermally denatured by frictional heat due to the running water, and to separate the flowing grain from each other. In addition, the peeled seed coat is prevented from adhering to the rotating rollers 5 and 6, and a smooth drop is achieved. In other words, the swollen grain between the rotating rollers 5 and 6 is separated from the seed coat by the action of being pushed out by being pinched by the fingertip due to the pinching frictional resistance of both rollers, and both are separated into the floating separation tank C with running water. Inflow.

As shown in FIG. 2, the flotation tank C is a water tank 8
A scraper 9 rotatably supported at a required span in the upper longitudinal direction, a screw conveyor 10 rotatably supported over the entire length in the longitudinal direction of the bottom, and a predetermined pressure disposed in the intermediate portion. And a jet pipe 11 for jetting compressed air, and the compressed air is pumped from a pressurized water device (known).

In the flotation tank C, the compressed air of a predetermined pressure sent from the pressurized water device is jetted from the jet pipe 11 into the water in the tank, so that the transferred cotyledon and seed coat mixed with the hypocotyls have a specific gravity. The cotyledon and hypocotyl are separated by the difference, and the seed coat is separated by the rising bubbles, the separation is promoted, and the seed coat floats, and is discharged by the scraper 9.

The sedimented cotyledons and hypocotyls are conveyed from the bottom outlet 12 by the screw conveyor 10 and separated by the water and passed through a fine mesh shooter (not shown) together with water to be collected. Further, the flotation / separation tank C is provided with a solid separation tank 13 and a recovery tank 14 at the overflow portion of the water tank 8, and along with the scraping of the seed coat by the scraper 9, a fine hypocotyl or a small piece of the seed coat that floats by the pressing force and overflows. Are passed through the solid separation tank 13, and the ejection pipe 1
The fine hypocotyl and small pieces of the seed coat are collected in the collection tank 14 by the compressed air of a predetermined pressure squirted from the tank 5.

[0014]

According to the present invention, the swollen soybean grain is pressed between the rotating rollers having elasticity on the surface and the seed coat is separated from the cotyledon by frictional resistance. Obtainable. The separated hypocotyls and seed coats are separated and collected by compressed air spouting in the flotation tank, the hypocotyls generated during the separation process during the transfer are also separated, and only the cotyledons as natto raw materials are carefully selected. Provided. Therefore, it is possible to provide a natto with a new manufacturing method and a new texture, which is divided into two nutrient-rich and delicious cotyledons without seed coat by an unconventional processing method.

[Brief description of the drawings]

FIG. 1 is an explanatory view of a peeling device according to the present invention.

FIG. 2 is an explanatory view of a flotation tank in the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Transport pipe 2 Hopper 3 Chute 4 Transport pipe 5 Rotating roller 6 Rotating roller 7 Power machine 8 Water tank 9 Scraper 10 Screw conveyor 11 Spouting pipe 12 Carry-out port 13 Solid separation tank 14 Recovery tank 15 Spouting pipe A Separating device B Peeling device C Floating Separation tank

Claims (2)

[Claims] 1. A soybean grain swollen with water flows together with water between rotating rollers opposed to each other at a predetermined interval and rotating inward with each other. A method for separating cotyledons and seed coat from soybean grain, comprising separating the seed coat from soybean. 2. A rotating roller made of an elastic material having a surface capable of sandwiching swollen soybean grains and being driven to rotate inward each other, and having water flowing between the rotating rollers. A peeling device, a soybean grain comprising a flotation tank that communicates with the compressed air jet tube, a scraper for collecting seed coat and a screw conveyor for collecting cotyledon, and separates cotyledon and seed coat by weight difference. Separate collector for cotyledon and seed coat.