JPS63222662A - Production of fine rice starch - Google Patents

Abstract

PURPOSE:To separate fine rice starch grain having about 5mum size in good yield at a short time, by sieving a ground refined rice grain into starch, protein, fat and the other ingredient utilizing the grain size. CONSTITUTION:Finely ground refined rice grain by a dry type or wet type grinder is passed through a machine having 7-10mum slit set and pending in patent application No.220377. Thereby only starch grain having about 5mum size is efficiently passed through the slit and separated from the other ingredient. Consequently fine rice starch product is obtained at a low cost, because the refined rice grain is treated in shorter production process at a shorter time compared with a conventional method, according to the above-mentioned method. The Figure shows a state of fine rice starch grain 10 passing through the slit sieve 7 of the above-mentioned machine. In the Figure, 8, 9 and 10 shows protecting board, coarse grain and casing of slit sieve respectively.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a method for producing fine rice starch of 10 microns or less, which is used as a raw material for paper manufacturing or cosmetics, etc., which require a smooth finish.

[Conventional technology]

Refined rice particles average 73% crude starch and 7% crude protein.
%, ■ Contains 3% fat, 1% crude fiber, 1% ash, and 14% moisture. The proteins of this rice are distributed in the aleurone layer, cell walls, and the outer periphery of starch grains, and most of these proteins are insoluble in water and cannot be removed simply by grinding or washing with water. Therefore, in order to produce rice starch with high purity, alkali, surfactant,
Furthermore, it is necessary to remove proteins by using ultrasound. However, although alkaline methods are convenient for removing proteins, they can damage starch granules when treated with alkaline solutions. Although the surfactant method and the ultrasonic method cause little damage to starch, they do not sufficiently remove proteins.

In order to actually produce starch, an alkaline method is used. That is, raw t1 brown rice is purified to about 90% and soaked in a 0.2 to 0.5% sodium hydroxide solution. Soak for about 24 hours, stirring occasionally, and discard the mother liquor. Add fresh sodium hydroxide solution to this and leave to soak for about 24 hours, stirring occasionally as before. Such alkali treatment is repeated for 2 to 3 days. By this operation, about 50% of the proteins in the rice grains are eluted and removed.

The rice particles that have been immersed in alkali are ground together with water in a grinder and separated through a 150-mesh sieve to obtain a starch emulsion.

The starch emulsion is placed in a sedimentation tank, and after the I grain portion is precipitated and removed, the upper layer is taken out and washed with water. Is the starch milk after being washed in a centrifugal dehydrator? Remove water through a filter, and
Dry in a fluidized dryer or flash dryer. After drying, the starch is crushed and sieved to obtain a product. (Literature: Starch Chemistry Handbook, supervised by Mita Nibu, pages 391 to 394) [Problems to be solved by the invention] Because purification methods such as the VC Mirai method, alkali treatment, and precipitation/F technique are used, it takes a long time. It takes a long time and the yield is poor.

The present invention does not require the use of alkaline aqueous solutions or large amounts of water.
The finely ground rice particles are processed into fine rice starch particles of around 5 microns using a machine for which patent 1'J1220377 [Manufacturing method of slit-shaped sieve] is pending.

The purpose is to perform separation in a short time with high yield.

[Means for solving problems]

■In order to remove impurities such as protein, crude fat, and coarse MIi fiber, starch particles are broken down into fine particles of around 5 microns by pulverizing rice particles without using chemicals such as alkali. , other ingredients other than starch do not break down into small pieces. Even if a part of the sieve is broken into small pieces, similar components have the property of agglomerating into large particles. An attempt was made to separate and purify only starch particles.

[Effect]

When refined rice particles were finely pulverized using a dry type or V-type pulverizer and passed through a machine currently being applied for in Patent Application No. 220377, which was set with a 7-10 micron sleeve I, starch particles of around 5 microns were obtained. was efficiently passed through, and no components of the pond were passed through the machine.

〔Effect of the invention〕

The fine rice starch particles of around 5 microns obtained by the present invention are each grain angular, and unlike the air classification method, the present invention has a size larger than the set slit (sieve mesh). large particles are not allowed to pass through,
Since it allows only fine particles to pass through accurately, it can fill in even the smallest unevenness and create a smooth surface.

Moreover, since the manufacturing process is shorter than the conventional method and processing can be done in a short time, it is possible to manufacture products at low cost.

Further, the present invention can be used either in a dry method or a wet method depending on the purpose.

[Brief explanation of drawings]

The figure shows the situation in which fine rice starch passes through a sieve, which is currently being applied for in Patent Application No. 220377R, ``Rice Starch Side Passage and Manufacturing Method for Slit-Shaped Sieve.'' Figure 1 shows the structure of rice particles, Figure 2
The figure shows finely ground rice particles, Figure 3 shows a state in which coarse particles are stuck in the slit-like sieve, and Figure 4 shows a state in which fine rice starch particles are passing through a slit-like sieve. 1... starch cell, 2... cell wall,
3...Amyloplast, 4...Single starch grain, 5...Crushed cell wall, etc., 6...
...Slit-like sieve mesh, 7...Slit-like sieve, 8...Protection plate, 9...Coarse particles, lO... Starch passed through. Particles, 11...
...Slit-shaped sieve casing, 12...
...Air knife. Patent applicant: Japan Co., Ltd. Engraving of Dossa paper drawing (no change in content) Figure 1 Procedural amendment dated October 14, 1939 1 Indication of case: Showa 2, 1939, 1st Ki No. 55890 2
Name of Kamimei Fine rice +1! l powder) Manufacturing method 3
Relationship between the person making the amendment and the case □Eng. 4. Date of amendment order: May 2, 1925. Nichiyo Jhi ＼′−−−2.

Claims (1)

[Claims] A method of grinding purified rice particles and efficiently separating only rice starch from starch, protein, lipids, and other components by sieving using the particle size.