GB/T 18146.3-2015Hemp fiber - Part 3: Cotton type hemp fiber (English PDF)

Foreword

GB/T 18146 "Hemp fiber" is divided into 3 parts:

--- Part 1: Raw white degummed hemp;

--- Part 2: Raw white hemp sliver;

--- Part 3: Cotton type hemp fiber. This part is Part 3 of GB/T 18146. This part is drafted in accordance with the rules given in GB/T 1.1-2009. This part replaces GB/T 18146.3-2000 "Hemp fibre - Part 3: Raw white hemp noil". Compared with GB/T 18146.3-2000, the main technical changes are as follows:

--- The standard name is changed from "Hemp fibre - Part 3: Raw white hemp noil" to "Hemp fiber - Part 3: Cotton type hemp fiber";

--- The scope is modified and changed from "applicable to raw white hemp noil" to "applicable to the quality assessment of cotton type hemp fibers";

--- GB/T 18146.1 is deleted from the normative references;

--- The definition of "cotton type hemp fiber" is added;

--- The "hemp Micronaire" is canceled and replaced by the "fineness";

--- The technical requirements for cotton type hemp fibers are modified;

--- The sampling quantity and sampling method are modified. This standard is proposed by and shall be under the jurisdiction of China Fiber Inspection Bureau. Drafting organizations of this part: Quartermaster Equipment Research Institute of the General Logistics Department, China-Hemp Industrial Investment Co., Ltd., Yunnan Fiber Inspection Bureau. The main drafters of this part: Hao Xinmin, Gao Mingzhai, Liang Ning, Zhao Jun, Tao Ran, Yang Yuan. The previous versions of the standards replaced by this part are as follows:

--- GB/T 18146.3-2000. Hemp fiber - Part 3: Cotton type hemp fiber

1 Scope

GB/T 18146.3-2015 is the Chinese national standard on hemp fiber - part 3: cotton type hemp fiber, in the field of textile and leather technology. The /T suffix marks it as a recommended standard: it is not compulsory by itself, but it becomes binding as soon as a contract, a tender or a customer specification calls it up - which in practice is how most foreign buyers meet it. It was issued on 3 July 2015 by the General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China; Standardization Administration of China, and has been in force since 1 October 2015. Classification: ICS 59.060.10, CCS B32. This page is published from the official record of the standard held by the Chinese standards administration: the identification, the dates, the classification and the issuing body are taken from there. The clause text, the tables and the numeric limits are in the document itself, which is delivered complete in English translation.

This part of GB/T 18146 specifies the definition, technical requirements, sampling quantity and sampling methods, test methods, inspection rules, packaging, marking, transportation, and storage of cotton type hemp fibers. This part applies to the quality assessment of cotton type hemp fibers.

2 Normative references

The following documents are essential to the application of this document. For the dated documents, only the versions with the dates indicated are applicable to this document; for the undated documents, only the latest version (including all the amendments) is applicable to this standard.

GB/T 8170 Rules of rounding off for numerical values & expression and judgment of limiting values

GB/T 9995 Determination of moisture content and moisture regain of textile - Oven- drying method

GB/T 18147.1 Test method for hemp fibre - Part 1: Test method for oil content of hemp fibre

GB/T 18147.3 Test method for hemp fiber - Part 3: Test method for length of hemp fiber

GB/T 18147.4 Test method for hemp fiber - Part 4: Test method for fineness of hemp fiber

GB/T 18147.5 Test method for hemp fiber - Part 5: Test method for breaking strength of hemp fiber

GB/T 18147.6 Test method for hemp fiber - Part 6: Test method for defect in hemp fiber

3 Terms and definitions

The following terms and definitions apply to this document. The sampling quantity is determined by the number of pieces in each batch. If the number of pieces is 2 or less in each batch, take 1 piece; if it is 5 or less in each batch, take 2 pieces; if it is 10 or less in each batch, take 3 pieces; if it is 25 or less in each batch, take 4 pieces, if it is 350 or less in each batch, take 5 pieces; if it is 350 or more in each batch, take 6 pieces.

5 Sampling quantity and sampling method...

6 Test methods

6.1 Moisture regain Through visual inspection and touch by hand, determine that there is no obvious abnormality in the moisture regain of the hemp fibers, and then carry out the test according to GB/T 9995.

6.2 Appearance quality Under the conditions of northerly daylight or simulated daylight (illuminance >=600 lx), inspect the appearance by eyes.

6.3 Oil content The test shall be carried out according to GB/T 18147.1.

6.4 Average length, short fiber content The test shall be carried out according to GB/T 18147.3.

6.5 Fineness The test shall be carried out according to GB/T 18147.4.

6.6 Breaking strength The test shall be carried out according to GB/T 18147.5.

6.7 Nep and strip fiber content The test shall be carried out according to GB/T 18147.6.