GB/T 41557-2022Combination certification for deliveries of raw wool regulation (English PDF)

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" drafted.

This document is revised and adopted the International Wool Textile Organization standard IWTO-31-02 "IWTO Raw Wool Delivery Batch and Batch Certificate Calculation".

Compared with IWTO-31-02, this document has more structural adjustments. For a list of the structure number changes between the two files, see Appendix A.

The technical differences between this document and IWTO-31-02 and their reasons are as follows.

--- Delete the principle (see Chapter 3 of IWTO-31-02), this document is mainly for the provisions of batch calculation, the principle is in practical application It is not meaningful;

--- Delete the terms "raw hair", "hair base", "vegetable impurity base", "grasping wool sample", "drill core sample", "sub-sample", "hardhead thorn and branch base" "Burl Length", "Burst Strength", "Clean Color", "Tristimulus Value", "Reflectivity", "Radiation Factor" (see Section 4 of IWTO-31-02 Chapter), in line with my country's technical conditions, to meet the needs of the use of this document;

--- The test method is changed to be performed according to GB 1523 (see Chapter 4, Chapter 5 of IWTO-31-02), which meets the technical conditions of our country, and Harmonize with existing standards;

--- Deleted the accuracy calculation (see 6.1.3, 6.2.3, 6.3.3, 6.4.3, 7.1.3, 7.2.3, 7.3.3, 7.4.3 of IWTO-31-02), The need for accuracy is not given in practical applications;

--- Deleted the "tri-stimulus value" (see 6.4 and 7.4 of IWTO-31-02), which is not involved in Chinese wool, and is suitable for Chinese sheep Status of the wool industry;

--- Deleted the "result expression" part (see Chapter 8 of IWTO-31-02) to adapt to the current situation of my country's wool industry;

--- Added and approved certificate (see Chapter 7) to facilitate the use of this document in wool trading.

The following editorial changes have been made to this document.

--- In order to harmonize with the existing standards, change the name of the standard to "Rules for the issuance of raw wool and certificates";

--- Added Appendix B (informative) "Certificate of Consolidation";

--- Deleted all notes and clause footnotes in IWTO-31-02;

--- Deleted Appendix A and Appendix B of IWTO-31-02.

This document is proposed and managed by the National Fiber Standardization Technical Committee (SAC/TC513).

1 Scope

This document specifies the test methods for the raw wool and batch certification rules, the calculation of the batch results, the calculation of the remainder of the delivery batch by the deduction method. And batch calculation and batch certificate.

This document is applicable to the issuance of the raw wool delivery batch inspection certificate.

2 Normative references

The contents of the following documents constitute essential provisions of this document through normative references in the text. Among them, dated citations documents, only the version corresponding to that date applies to this document; for undated references, the latest edition (including all amendments) applies to this document.

GB 1523 Sheep wool

3 Terms and Definitions

The following terms and definitions apply to this document.