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This standard is developed in accordance with the rules given in GB/T 1.1-2009.
This standard replaces FZ/T 73022-2012 Knitted thermal underwear and the following main technical changes have been made with respect to FZ/T 73022-2012:
——the application scope is modified: this standard is applicable to quality identification for thermal underwear products made of knitted fabrics with an insulation rate of 30% or above;
——the relevant requirements of the mandatory standard GB 31701 are added for infants’ and children's products.
——the implemented standard for fiber content is modified (see Sub-clause 4.3.1);
——the indexes of dimensional change rate in water washing are modified (see Sub-clause 4.3.1);
——the indexes of colour fastness to water are modified (see Sub-clause 4.3.1);
——the indexes of colour fastness to soap are modified (see Sub-clause 4.3.1);
——the indexes of colour fastness to perspiration are modified (see Sub-clause 4.3.1);
——the indexes of colour fastness to rubbing are modified (see Sub-clause 4.3.1);
——the indexes of colour fastness to soap and to rubbing at printing and non-printing parts are combined (see Sub-clause 4.3.1);
——the requirements for surface defects are modified (see Sub-clause 4.4.2);
——the requirements for sewing are modified (see Sub-clause 4.4.6);
——the test methods for fiber content are modified (see Sub-clause 5.2.2);
——the requirements for air permeability are modified (see Sub-clause 5.2.8);
——the judgment rules are changed (see Clause 7);
——the instructions, packaging, transportation and storage of the products are modified (see Sub-clauses 8.2, 8.3, 8.4, Sub-clause 7.2 of Edition 2012).
This standard was proposed by China National Textile and Apparel Council.
This standard is under the jurisdiction of the Subcommittee on Knitwear of National Technical Committee on Textiles of the Standardization Administration of China (SAC/TC 209/SC 6).
The previous edition of this standard is as follows:
——FZ/T 73022-2012.
Knitted thermal underwear
1 Scope
This standard specifies the product sizing, requirements, test methods, sampling rules, judgment rules, product instructions, packaging, transportation and storage of knitted thermal underwear.
This standard is applicable to quality identification for thermal underwear products made of knitted fabrics with an insulation rate of 30% or above.
This standard is not applicable to flocculent thermal underwear products.
2 Normative references
The following referenced documents are indispensable for the application 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 2910 (All parts) Textiles - Quantitative chemical analysis
GB/T 2912.1 Textiles - Determination of formaldehyde - Part 1: Free and hydrolyzed formaldehyde (water extraction method)
GB/T 3920 Textiles - Tests for colour fastness - Colour fastness to rubbing
GB/T 3921-2008 Textiles - Tests for colour fastness - Colour fastness to washing with soap or soap and soda
GB/T 3922 Textiles - Testing method for colour fastness to perspiration
GB/T 4802.1-2008 Textiles - Determination of fabric propensity to surface fuzzing and to pilling - Part 1: Circular locus method
GB/T 4856 Package of cotton goods and knitwear
GB / T 5296.4 Instructions for use of products of consumer interest - Part 4: textiles and apparel
GB/T 5453 Textiles - Determination of permeability of fabrics to air
GB/T 5713 Textiles - Tests for colour fastness - Colour fastness to water
GB/T 6411 A series of size of knitted underwear
GB / T 6529 Textiles - Standard Atmospheres for Conditioning and Testing
GB/T 7573 Textiles - Determination of pH of aqueous extract
GB/T 8629-2001 Textiles - Domestic washing and drying procedures for textile testing
GB/T 8878 Knitted cotton underwear
GB/T 11048-1989 Testing method for warmth retention property of textiles
GB/T 17592 Textiles - Determination of the banned azo colourants
GB 18401 National general safety technical code for textile products
GB/T 19976-2005 Textiles - Determination of bursting strength - Steel ball method
GB/T 29862 Textiles - Identification of fiber content
GB 31701 Safety technical code for infants and children textile products
FZ/T 01026 Textiles - Quantitative chemical analysis - Multinary fibre mixtures
FZ/T 01057 (All parts) Test method for identification of textile fibers
FZ/T 01095 Textile - Test method of elastane fibre content
FZ/T 01101 Textile test method - Fiber content - Quantitative physical analysis
GSB 16-1523 Knitted fabric fuzzing and pilling sample photograph
GSB 16-2159 Knitwear standard depth scale (1/12)
3 Product specification
The product sizing of knitted thermal underwear shall comply with GB/T 6411, and the sizing beyond the standard range may be increased or decreased in sequence according to the grading principles specified in the standard.
4 Requirements
4.1 Specific requirements
The requirements are specified in two aspects, i.e. inherent quality and appearance quality. The inherent quality includes indexes such as bursting strength, fiber content, formaldehyde content, pH value, peculiar smell, decomposable carcinogenic aromatic amine dyes, insulation rate, air permeability, pilling, dimensional change rate in water washing, colour fastness to water, colour fastness to soap, colour fastness to perspiration, colour fastness to rubbing. The appearance quality includes the indexes such as surface defect, specification and dimension deviation, dimensional difference at symmetric parts and sewing requirements.
4.2 Grading requirements
4.2.1 The products are classified into superior products, first-grade products and acceptable products in terms of the quality grade.
4.2.2 For inherent quality, the products are graded by batch; and for appearance quality, they are graded by piece. The grade, which is lower in the two quality grading results, prevails.
4.2.3 For all inherent quality indexes, the lowest test result is regarded as the grading basis for this batch of products.
4.2.4 Where appearance quality problems with different product grades are found on the same product, the product shall be graded according to the lowest quality grade. For one product, no more than two limit surface defects of the same grade are allowed to exist; otherwise, this product shall be degraded by one grade.
4.3 Requirements for inherent quality
4.3.1 See Table 1 for requirements for inherent quality
Foreword i
1 Scope
2 Normative references
3 Product specification
4 Requirements
5 Test methods
6 Sampling rules
7 Judgment rules
8 Product instruction, packaging, transportation and storage
