Cotton - Sea island cotton
1 Scope
This document defines the terms and definitions related to sea island cotton, specifies the quality requirements, inspection rules, inspection certificates, packaging and marking, storage and transportation, and describes the corresponding sampling and inspection methods.
This document is applicable to the production, purchase, processing, trade, storage and use of sea island cotton.
2 Normative references
The following documents contain provisions 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 of the referenced document (including any amendments) applies.
GB/T 6102.1 Test method for moisture regain in raw cotton by oven drying
GB/T 6102.2 Test method for moisture regain in raw cotton - Electrical resistance meter
GB/T 6498 Test method for Micronaire value of cotton fibres
GB/T 6499 Test method for percentage of trash content in raw cotton
GB 6975 Cotton baling
GB/T 8170 Rules of rounding off for numerical values & expression and judgment of limiting values
GB/T 13786 Artificial daylighting illumination for cotton classing rooms
GB/T 19617 Test method for length of cotton - Hand-measured staple length
GB/T 20392 Test method for physical properties of cotton fibers - High volume instruments method
GB/T 41690 Quantitative test method for foreign fiber in raw cotton - Manual method
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
grade
a comprehensive index representing the quality grade of cotton maturity, color and luster characteristics, processing quality, etc.
3.2
cotton modal grade
grade that accounts for 80% or more when inspected by batch with the rest of the grades only adjacent to it
3.3
gross weight
sum of the weight of cotton and its packaging materials
3.4
net weight
weight after deducting the weight of packaging materials from the gross weight
3.5
conditioned weight
weight converted from the actual impurity content and actual moisture regain of cotton to the standard impurity content and conditioned moisture regain
3.6
conditioned lint percentage of seed cotton
percentage of the conditioned weight of lint cotton extracted from seed cotton to the weight of corresponding seed cotton
3.7
foreign fiber
non-cotton fibers and non-natural color cotton fibers mixed into cotton
Note: The foreign fiber types include chemical fiber, hair, silk, hemp, plastic film, plastic rope, dyed thread (rope, cloth pieces), etc.
3.8
the content of foreign fiber in a baled cotton
ratio of the weight of foreign fibers picked out from the sample to the weight of the picked sample
Note: Expressed in g/t.
3.9
dangerous foreign matters
hard and soft matters mixed into cotton
Note: Dangerous matters include metals, bricks, stones, foreign fibers, etc.
4 Requirements for quality
4.1 Grade
4.1.1 Grade grading
The sea island cotton is classified into five grades, namely Grade 1 to Grade 5, according to the grade conditions. Grade 3 is the standard grade.
Contents
Foreword I
1 Scope
2 Normative references
3 Terms and definitions
4 Requirements for quality
5 Sampling
6 Test methods
7 Inspection rules
8 Inspection certificate
9 Packaging and marking
10 Storage and transportation
Cotton - Sea island cotton
1 Scope
This document defines the terms and definitions related to sea island cotton, specifies the quality requirements, inspection rules, inspection certificates, packaging and marking, storage and transportation, and describes the corresponding sampling and inspection methods.
This document is applicable to the production, purchase, processing, trade, storage and use of sea island cotton.
2 Normative references
The following documents contain provisions 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 of the referenced document (including any amendments) applies.
GB/T 6102.1 Test method for moisture regain in raw cotton by oven drying
GB/T 6102.2 Test method for moisture regain in raw cotton - Electrical resistance meter
GB/T 6498 Test method for Micronaire value of cotton fibres
GB/T 6499 Test method for percentage of trash content in raw cotton
GB 6975 Cotton baling
GB/T 8170 Rules of rounding off for numerical values & expression and judgment of limiting values
GB/T 13786 Artificial daylighting illumination for cotton classing rooms
GB/T 19617 Test method for length of cotton - Hand-measured staple length
GB/T 20392 Test method for physical properties of cotton fibers - High volume instruments method
GB/T 41690 Quantitative test method for foreign fiber in raw cotton - Manual method
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
grade
a comprehensive index representing the quality grade of cotton maturity, color and luster characteristics, processing quality, etc.
3.2
cotton modal grade
grade that accounts for 80% or more when inspected by batch with the rest of the grades only adjacent to it
3.3
gross weight
sum of the weight of cotton and its packaging materials
3.4
net weight
weight after deducting the weight of packaging materials from the gross weight
3.5
conditioned weight
weight converted from the actual impurity content and actual moisture regain of cotton to the standard impurity content and conditioned moisture regain
3.6
conditioned lint percentage of seed cotton
percentage of the conditioned weight of lint cotton extracted from seed cotton to the weight of corresponding seed cotton
3.7
foreign fiber
non-cotton fibers and non-natural color cotton fibers mixed into cotton
Note: The foreign fiber types include chemical fiber, hair, silk, hemp, plastic film, plastic rope, dyed thread (rope, cloth pieces), etc.
3.8
the content of foreign fiber in a baled cotton
ratio of the weight of foreign fibers picked out from the sample to the weight of the picked sample
Note: Expressed in g/t.
3.9
dangerous foreign matters
hard and soft matters mixed into cotton
Note: Dangerous matters include metals, bricks, stones, foreign fibers, etc.
4 Requirements for quality
4.1 Grade
4.1.1 Grade grading
The sea island cotton is classified into five grades, namely Grade 1 to Grade 5, according to the grade conditions. Grade 3 is the standard grade.
Contents of GB/T 19635-2024
Contents
Foreword I
1 Scope
2 Normative references
3 Terms and definitions
4 Requirements for quality
5 Sampling
6 Test methods
7 Inspection rules
8 Inspection certificate
9 Packaging and marking
10 Storage and transportation
