Foreword
Codeofchina.com is in charge of this English translation. In case of any doubt about the English translation, the Chinese original shall be considered authoritative.
This document is developed in accordance with the rules given in GB/T 1.1-2020 Directives for standardization - Part 1: Rules for the structure and drafting of standardizing documents.
This document replaces GB/T 16984-2008 Raw hemp. In addition to structural adjustments and editorial changes, the following main technical changes have been made with respect GB/T 16984-2008:
a) The classification of raw hemp has been modified (see Clause 4 hereof; 3.2 of Edition 2008);
b) The terms and technical requirements related to dew-retting hemp have been added (see 3.5, and Clause 5 hereof);
c) The requirements for grading have been modified (see 5.1 hereof; 4.1.2 of Edition 2008);
d) The clause "Instruments and tools" has been deleted (see Clause 5 in Edition 2008);
e) The indicator "bundle fiber breaking tenacity" has been changed to "breaking strength" (see 6.5 hereof; 8.3 of Edition 2008);
f) The inspection rules have been added (see Clause 7);
g) The clause "Calculation of conditioned weight" has been deleted (see Clause 10 of Edition 2008).
Attention is drawn to the possibility that some of the parts of this document may be the subject of patent rights. The issuing body of this document shall not be held responsible for identifying any or all such patent rights.
This document was proposed by and is under the jurisdiction of SAC/TC 513 the National Technical Committee on Fibers of Standardization Administration of China.
The previous editions of this document are as follows:
——It was firstly issued as GB/T 16984-1997 in 1997 and revised for the first time in 2008;
——This is the second revision.
Raw hemp
1 Scope
This document specifies the classification, requirements, inspection rules, packaging, marking, transport, storage, and corresponding test methods for raw hemp.
This document is applicable to the quality grade evaluation of raw hemp.
2 Normative references
The following documents contain requirements which, through reference in this text, constitute provisions of this document. For dated references, only the edition cited applies. For undated references, the latest edition (including any amendments) applies.
GB/T 6529 Textiles - Standard atmospheres for conditioning and testing
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 12945 Jute fiber
GB/T 17345 Scutched flax
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
raw hemp
hemp bast used as raw material for textiles
3.2
water retted hemp
hemp bast derived from hemp straws after water retting, rinsing, stripping, and drying
3.3
sunned hemp
hemp bast stripped from hemp straws after procedures of drying, stacking, and solar exposure
3.4
peeling hemp from green straw
hemp bast that is peeled immediately after hemp harvest
4 Classification
Raw hemp is divided into four categories based on the processing technique: water retted hemp, sunned hemp, peeling hemp from green straw, and dew-retting hemp.
Foreword i
1 Scope
2 Normative references
3 Terms and definitions
4 Classification
5 Requirements
6 Test methods
7 Inspection rules
8 Packaging, marking, transport and storage
