This standard is applicable to the determination of the coarseness and fineness of commercial grain powder. GB/T 5507-1985 Method for determination of coarseness and fineness of grain and oilseed powder GB/T5507-1985 Standard download decompression password: www.bzxz.net

National Standard of the People's Republic of China
Inspection of grain and oilseedsMethods for determination offineness degree of floursThis standard applies to the determination of the fineness degree of commercial grain powder.Instruments and appliances
Electric powder sieve: square, inner diameter 23.3cm, height 4.8cm, speed 200r/mins1.1
Balance: sensitivity 0.1g;
Rubber ball: diameter 5mm
Surface;
Sampling shovel, brush, hair brush, etc.
2 Operation method
UDC (633.1+633.85)
.001.4
GB5507-85
According to the sieve layers specified in the quality standard, put 5 rubber balls in each sieve layer, weigh 50g (W) of the sample from the average sample, put it in the upper sieve layer, and then install it in the order of large-hole sieve on the top, small-hole sieve on the bottom, the bottom layer is the sieve bottom, and the top layer is the sieve cover. Close it tightly, start the motor, and sieve continuously for 10 minutes. Take out and tilt each layer of sieve, rotate and beat the sieve frame and use a brush to collect the powder on the sieve to one corner, pour it out and weigh it (W,, less than 0.1g is not counted).
3 Result calculation
The result of the determination of the coarseness of flour grains is expressed as the percentage of the powder remaining on the specified sieve layer to the sample. Calculate W
Retention (%)
Where: W,——weight of powder retained on the sieve, g; W-weight of sample, g.
The allowable difference between the two test results shall not exceed 0.5%. The average is the test result. The test result is taken to the first decimal place. Comparison of specifications of new and old sieves See the following table for the comparison of specifications of new and old sieve groups: Comparison table of specifications of new and old sievesbZxz.net
Published by the National Bureau of Standards on November 2, 1985
Aperture width,
Aperture width,
New to old soil mm
Implemented on July 1, 1986
Additional notes:
This standard is proposed by the Ministry of Commerce of the People's Republic of China. This standard is drafted by the Grain Storage and Transportation Bureau of the Ministry of Commerce. GB5507—85
The main drafters of this standard are Gao Xiuwu, Yang Haoran, Wu Yanxia and Lü Guifen.
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