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 standard 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 9107-1999 Refined cotton. In addition to structural adjustments and editorial changes, the following main technical changes have been made with respect GB/T 9107-1999:
a) The scope is modified: the application scope is modified from alkaline cooking to cooking (see Clause 1 hereof; Clause 1 of Edition 1999);
b) The product form is added (see 4.1.2 hereof), specifications (see 4.2 hereof; 3.2.2 of Edition 1999) and model compositions are changed (see 4.4 hereof; 3.2 of Edition 1999);
c) The requirements of foreign fibers in flocculated refined cotton products (5.1), foreign matters in flocculated refined cotton products (5.2), dust count of rolled (sheeted) refined cotton products (5.3), bursting strength of refined cotton products (5.4), and the quantitative and thickness of rolled (sheeted) refined cotton products (5.5) are added;
d) The product models of refined cotton for cellulose acetate, cellulose ether, and nitrocellulose are added, and the technical performance indexes are modified (see 5.6, 5.7, and 5.8 hereof, and 4.2.1, 4.2.3, and 4.2.2 of Edition 1999);
e) The subclauses "General provisions" (see 6.1), "Environmental requirements for specimen preparation" (see 6.2.1), and "Specimen preparation in rolls (sheets)" (see 6.2.3) are added.
f) Determination methods, including limiting viscosity (see 6.3), acetone soluble matter (see 6.11), foreign fibers (see 6.12), impurities (see 6.13), dirt count (see 6.14), quantification, thickness (see 6.15), and rupture resistance (see 6.16) are add;
g) The “Inspection rules” is modified (see Clause 7 hereof; Clause 6 of Edition 1999);
h) The requirements of marking, packaging, transportation and storage are modified (see Clause 8 hereof and Clause 8 of 1999 edition) and the requirements of delivery are added (see 8.5).
Attention is drawn to the possibility that some of the elements 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 standard was proposed by and is under the jurisdiction of China North Industries Group Corporation Limited.
This document was issued in 1988 as first edition, its first revision was issued in 1999, and this is the second revision.
Refined cotton
1 Scope
This document specifies the product model, requirements, test methods, inspection rules, marks, packaging, transportation, storage, and delivery of refined cotton.
This document is applicable to refined cotton produced by cooking, bleaching, and other processes with cotton linter as raw materials.
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 of the referenced document (including any amendments) applies.
GB/T 451.2 Paper and board - Determination of grammage
GB/T 451.3 Paper and board - Determination of thickness
GB/T 601 Chemical reagent - Preparations of reference titration solutions
GB/T 603 Chemical reagent - Preparations of reagent solutions for use in test methods
GB/T 740 Pulps - Sampling for testing
GB/T 1539 Paperboard - Determination of bursting strength
GB/T 1541 Paper and board - Determination of dirt
GB/T 1548 Pulps - Determination of limiting viscosity number in cupri-ethylenediamine (CED) solution
GB/T 6682 Water for analytical laboratory use - Specification and test methods
GB/T 8170 Rules of rounding off for numerical values & expression and judgment of limiting values
GB/T 8946 General technical requirements of plastic woven sack
GB/T 22902 Pulps - Determination of acetone-soluble matter
QB/T 2190 Wire brush
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
refined cotton; cotton linters pulp
cotton cellulose materials produced by cooking, bleaching, and other processes with cotton linter as raw material
3.2
foreign fiber
non-cotton fibers and non-natural cotton fibers mixed with refined cotton
Note: Such as chemical fiber, hair, silk, hemp, plastic rope, plastic film, and dyed thread (rope, cloth).
[Source: GB/T 20223-2018, 3.11, modified]
3.3
foreign matter
yellow and black spots and other non-cotton fiber substances attached to the fiber surface
Note: such as sawdust, bamboo chips, silt, cottonseed hull, metal objects.
[Source: GB/T 20223-2018, 3.13, modified]
4 Product models
4.1 Classification
4.1.1 The product main purposes are divided into three categories:
a) Those for cellulose acetate are denoted by the capital letter C;
b) Those for cellulose ether are denoted by the capital letter M;
c) Those for nitrocellulose are denoted by the capital letter X.
4.1.2 The product forms are divided into two categories:
a) Flocculated products are denoted by the capital letter X;
b) Rolled or flaked products are denoted by the capital letter J.
4.2 Specification
The specifications are divided by limiting viscosity, and the product specification codes are 5, 15, 30, 60, 100, 200, 400, 650, 1000, 2000, and 3000.
4.3 Grade
Products are divided into three grades, which are represented by Roman numerals as Grades I, II, and III.
4.4 Model composition
The product model is composed of purpose, specification, form, and grade. Its representation method is shown in Figure 1.
Example:
M100X-I means: 100# flocculent Grade I refined cotton for cellulose ether.
Figure 1 Representation of product model
Foreword i
1 Scope
2 Normative references
3 Terms and definitions
4 Product models
4.1 Classification
4.2 Specification
4.3 Grade
4.4 Model composition
5 Requirements
5.1 Foreign fiber in flocculated refined cotton products
5.2 Foreign matters in flocculated refined cotton products
5.3 Dust count of rolled (sheeted) refined cotton products
5.4 Bursting strength of refined cotton products
5.5 Quantitative and thickness of rolled (sheeted) refined cotton products
5.6 Technical performance indexes of refined cotton for cellulose acetate
5.7 Technical performance indexes of refined cotton for cellulose ether
5.8 Technical performance indexes of refined cotton for nitrocellulose
6 Test methods
6.1 General requirements
6.2 Specimen preparation
6.3 Limiting viscosity
6.4 Content of α-cellulose
6.5 Moisture content
6.6 Hygroscopicity
6.7 Ash content
6.8 Sulfuric acid insoluble matter content
6.9 Whiteness
6.10 Iron content
6.11 Acetone soluble matter
6.12 Foreign fiber
6.13 Foreign matter
6.14 Dirt count
6.15 Quantification, thickness
6.16 Rupture resistance
7 Inspection rules
7.1 Inspection classification
7.2 Appraisal inspection
7.3 End-of-manufacturing inspection
8 Marking, packaging, transport, storage, and delivery
8.1 Marking
8.2 Packaging
8.3 Transportation
8.4 Storage
8.5 Delivery
Annex A (Informative) Aggregation level and viscosity range of refined cotton products with various specifications
Annex B (Informative) Determination of aggregation level
Annex C (Informative) Determination of viscosity range
Annex D (Informative) Preparation method of cuprammonium solution
Bibliography
