GB/T 40944-2021 English PDF

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GB/T 40944-2021: Determination of feed particle size - Geometric mean diameter method
Status: Valid

Standard ID	USD	BUY PDF	Lead-Days	Standard Title (Description)	Status
GB/T 40944-2021	139	Add to Cart	3 days	Determination of feed particle size - Geometric mean diameter method	Valid

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Basic data

Standard ID: GB/T 40944-2021 (GB/T40944-2021)
Description (Translated English): Determination of feed particle size - Geometric mean diameter method
Sector / Industry: National Standard (Recommended)
Classification of Chinese Standard: B46
Word Count Estimation: 7,737
Issuing agency(ies): State Administration for Market Regulation, China National Standardization Administration

GB/T 40944-2021: Determination of feed particle size - Geometric mean diameter method

---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
Determination of feed particle size - Geometric mean diameter method ICS 65.120 CCSB46 National Standards of People's Republic of China Geometric mean particle size method for feed particle size determination Released on 2021-11-26 2022-06-01 implementation State Administration for Market Regulation Issued by the National Standardization Management Committee

Foreword

This document is in accordance with the provisions of GB/T 1.1-2020 "Guidelines for Standardization Work Part 1.Structure and Drafting Rules of Standardization Documents" Drafting. Please note that some of the contents of this document may involve patents. The issuing agency of this document is not responsible for identifying patents. This document was proposed and managed by the National Feed Industry Standardization Technical Committee (SAC/TC76). Drafting organization of this document. Henan University of Technology. The main drafters of this document. Wang Weiguo, Wang Jinrong, Yang Gang, Liu Zhen, Cui Yaoming, Qiao Hanzhen. Geometric mean particle size method for feed particle size determination

1 Scope

This document specifies the geometric mean particle size determination method of feed particle size. This document is applicable to the determination of the particle size of powder and granular feed materials, feed additives and feed products processed by crushing or other methods.

2 Normative references

The content of the following documents constitutes an indispensable clause of this document through normative references in the text. Among them, dated quotations Only the version corresponding to the date is applicable to this document; for undated reference documents, the latest version (including all amendments) is applicable to This document. GB/T 5329 Test sieve and sieving test terminology GB/T 6003.1 Technical requirements and inspection of test sieves Part 1.Metal wire woven mesh test sieves GB/T 10647 Terminology of Feed Industry GB/T 14699.1 Feed sampling

3 Terms and definitions

The following terms and definitions defined in GB/T 5329 and GB/T 10647 apply to this document. 3.1 Geometric mean particle size geometricmeandiameter The particle size corresponding to a 50% probability in a particle size distribution curve is equivalent to the median particle size. 3.2 Size distribution curve sizeistributioncurve Graph showing the results of particle size analysis. [Source. GB/T 5329-2003, 2.4.5] 3.3 Screening endpoint When the sieving is carried out to the point in time when the amount of sieving for further sieving is not enough to significantly change the sieving result. [Source. GB/T 5329-2003, 2.3.9, with modification]

4 Principle

Use the specified standard test sieve to screen the sample on the vibrating machine, determine the quality of the material retained on each layer of the sieve, and calculate the geometrical plane of the sample. Average particle size, etc.

5 materials

5.1 Rubber ball or silica gel ball. 15mm~20mm in diameter, used to bounce to clean the screen and crush the fine powder agglomerates on the small aperture screen. ......

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