JPS59150551A - Dehulling of soybean - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for dehulling soybeans that enables effective dehulling without heating whole soybeans or adjusting moisture content.

Conventionally, in order to dehull whole soybeans, the raw soybeans are heated and dried at low temperatures to create a space between the skin and cotyledons, and when the soybeans are split in this state, the skin and cotyledons will naturally separate. It was known that soybeans could be dehulled very easily. However, this conventional method has the disadvantage that the soybean protein may be denatured by the heat treatment and that the heat drying cannot be omitted, which complicates the process accordingly.

(1) The present inventor has completed the present invention as a result of focusing on the above-mentioned points and conducting intensive research to eliminate the drawbacks.

The purpose of the method of the present invention is to eliminate the heat treatment of soybeans to eliminate protein denaturation, to simplify the process by omitting the heating step, and to obtain beautiful cotyledons in their original shape without small cracks. It is an object of the present invention to provide a method for dehulling soybeans, which can reduce the processing time.

The gist of the present invention resides in a method for dehulling soybeans, which comprises grinding whole soybeans without heat treatment and then peeling them.

The soybeans used as whole soybeans are those from which foreign substances have been removed, for example, foreign substances larger than soybeans (corn, mud lumps, etc.) or foreign substances smaller than soybeans (grass seeds, morning glory seeds, etc.) are removed using a sieving device, and then foreign substances that are smaller than soybeans (grass seeds, morning glory seeds, etc.) are removed using a sieving device. Heavy foreign objects such as stones are removed using a roll sorter, and foreign objects that have a specific gravity similar to that of soybeans but have a different shape are removed using a roll sorter. The whole soybeans to be processed have not been subjected to any drying process (2), that is, they have not undergone any moisture adjustment.

'GJfl'il processing refers to grinding the outer skin of whole soybeans using a grinder. The standard sizes of the grinder used in the present invention are No. 16, No. 20, No. 24, and No. 30.
No. 24 is most preferred. If this grinding process is repeated, it is possible to remove 100% of the hulls from whole soybeans, but if you try to remove the hulls 100%, the soybean kernels, or cotyledons, will also be ground, resulting in a very poor yield. Therefore, 100% grinding of the outer skin is not applicable to the method of the present invention. The grinding process used in the method of the present invention refers to grinding soybeans to the point where only the outer skin is ground and a thin outer skin remains. Although there may be cases in which contaminated materials are mixed in, this does not exclude such cases. The whole soybean is naturally heated by the frictional heat of this grinding, and due to this heat and the thinness of the outer skin, the moisture of the soybean is removed from the outer surface, and there is a gap between the cotyledons and the thinner outer skin after being ground. (3) A gap will be created. When this grinding process is completed, the temperature of the soybeans does not become very high, so protein denaturation does not occur. Thereafter, a gap is created between the soybean fruit and the thinned skin due to the moisture escaping, albeit in a small amount. After this grinding process, soybeans are easily molted or peeled because there is a gap between the fruit and the thinned skin, and in the subsequent peeling process, only the thinned outer skin is peeled off and the cotyledons are small. It is possible to obtain beautiful half-split cotyledons without cracking. If the ground soybeans are left as is, water will naturally evaporate from the thinned outer skin, but a short period of forced ventilation (either cold or hot air is fine) will quickly evaporate the water before proceeding to the next process. If you send it to , it will peel off the skin well. Furthermore, even if the product is directly put into the peeling process without waiting for a while, the skin will be peeled in the same way as water evaporates during the peeling process (in this case, the residence time in the peeling process will be longer). Furthermore, depending on the grinder used, if a long process grinder is used, one treatment is sufficient, but (4) if a short process grinder is used, it may be necessary to pass the product several times.

The peeling process is a process of peeling soybeans, and is carried out by a conventional method, for example, using a grain grinder.

The dehulled or peeled soybean mixture described above includes dehulled cotyledons, germ, and skin (sometimes whole soybeans that have not yet been dehulled are also included). First, the skin is removed by conventional wind-slicing. Then, the soybeans are separated into unhulled whole soybeans, half-split cotyledons, and germs by sieving. Whole soybeans can be returned to the grinding or peeling process. Furthermore, by sieving the semi-split cotyledons and the germ, the two can be separated. Additionally, if a small amount of small cotyledons are present, these can also be separated by sieving.

Examples of the present invention are given below.

Example 1 100 kg of raw raw soybeans were passed through a sieve device (Harada Sangyo's company!!!) to remove foreign substances larger than soybeans (corn, mud lumps, etc.) and (5) foreign substances smaller than soybeans (grass seeds, morning glory seeds, etc.) Except,
Contaminated stones and the like were removed using a stone removal device (manufactured by Harada Sangyo ■), and irregularly shaped objects were removed by passing through a roll sorter (manufactured by Genga Sangyo). Next, the grinder number 24 (Harada Sangyo ■
The whole soybeans were applied to the grinding process for about 1 minute. Approximately half of the outer skin of the whole soybean had been ground and became a thin skin. Next, a ventilation fan (manufactured by Harada Sangyo@) was used to blow cold air.
After drying with ventilation for 0 minutes, it was peeled using a peeling machine (manufactured by Harada Sangyo@). Then, the peeled skin was removed using an air separator (manufactured by Harada Sangyo@), and finally the cotyledons and germs were separated using a multi-stage sieve device (manufactured by Harada Sangyo@). The obtained cotyledons were separated neatly with almost no small cracks, and had a so-called half-split shape in which a whole soybean was halved.

Example 2 The same process as in Example 1 was carried out, except that after the grinding process, the material was dried with hot air at 60° C. for 5 minutes. As in Example 1, the soybeans could be successfully dehulled.

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Claims (1)

[Claims] (1) After grinding whole soybeans without heat treatment,
A method for dehulling soybeans, which is characterized by dehulling.