GB/T 22849-2024 English PDF (GBT22849-2024)

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GB/T 22849-2024: Knitted T-shirt
GB/T 22849-2024
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 59.080.30
CCS W 63
GB/T 22849-2024
Replacing GB/T 22849-2014
Knitted T-shirt
针织 T恤衫
ISSUED ON: MARCH 15, 2024
IMPLEMENTED ON: OCTOBER 01, 2024
Issued by: State Administration for Market Regulation;
Standardization Administration of the People’s Republic of China.
Table of Contents
Foreword ... 3
1 Scope ... 6
2 Normative references ... 6
3 Terms and definitions ... 8
4 Product size ... 8
5 Requirements ... 8
6 Tests ... 12
7 Sampling rules ... 19
8 Judgment rules ... 19
9 Product instructions, packaging, transportation and storage ... 20
Knitted T-shirt
1 Scope
This document specifies the product size, technical requirements, sampling rules,
judgment rules, product instructions, packaging, transportation and storage
requirements of knitted T-shirts, and describes the corresponding test methods.
This document applies to the identification of the quality of various types of knitted T-
shirts made mainly of knitted fabrics.
This document does not apply to knitted T-shirts for infants and young children aged
36 months and below.
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 250 Textiles - Tests for colour fastness - Grey scale for assessing change in
colour
GB/T 251 Textiles - Tests for colour fastness - Grey scale for assessing staining
GB/T 1335 (all parts) Standard sizing systems for garments
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 - Tests for colour fastness - Colour fastness to perspiration
GB/T 4802.1-2008 Textiles - Determination of fabric propensity for fuzzing and
pilling - Part 1: Circular locus method
GB/T 4802.3 Textiles - Determination of fabric propensity to surface fuzzing and to
pilling - Part 3: Pilling box method
GB/T 4856 Package of cotton goods
GB/T 5296.4 Instructions for use of products of consumer interest - Part 4: Textiles
and apparel
GB/T 5711 Textiles - Tests for colour fastness - Colour fastness to drycleaning using
perchloroethylene solvent
GB/T 5713 Textiles - Tests for colour fastness - Colour fastness to water
GB/T 6529 Textiles - Standard atmospheres for conditioning and testing
GB/T 7573 Textiles - Determination of pH of aqueous extract
GB/T 8170 Rules of rounding off for numerical values and expression and judgement
of limiting values
GB/T 8427-2019 Textiles - Tests for color fastness - Color fastness to artificial light:
Xenon arc
GB/T 8629-2017 Textiles - Domestic washing and drying procedures for textile
testing
GB/T 8878 Knitted underwear
GB/T 14576 Textiles - Tests for colour fastness - Colour fastness to light of textiles
wetted with artificial perspiration
GB/T 14801 Test method for skewness and bow in woven and knitted fabrics
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/T 31127-2014 Textiles - Tests for colour fastness - Colour fastness to transfer in
joints
GB 31701 The safety technical code for infants and children textile products
GB/T 38015 Textiles - Quantitative chemical analysis - Mixtures of elastane and
certain other fibers
FZ/T 01026 Textiles - Quantitative chemical analysis - Multinary fibre mixtures
FZ/T 01057 (all parts) Test method for identification of textile fibers
FZ/T 01101 Textiles test method - Fiber content - Quantitative physical analysis
FZ/T 70014 A series of size of knitted T-shirt
FZ/T 80007.3-2006 Dry wash resistance test method for garments used adhesive
interlining
GSB 16-1523 Pilling standard of knitted fabric
GSB 16-2159 Standard depth sample card for knitted products (1/12)
GSB 16-2500 Defect appearance replicas of knitted fabric
GSB 16-2922 Pilling standard of carded wool knitwear
GSB 16-2923 Pilling standard of combed wool knitwear
3 Terms and definitions
For the purpose of this document, the following terms and definitions apply.
3.1
fluorescence color
The color that certain substances exhibit when they absorb incident light of a certain
wavelength and are excited to emit visible light.
NOTE: The color that appears fluorescent after being irradiated by ultraviolet light.
4 Product size
According to the provisions of FZ/T 70014 or GB/T 1335 (all parts). The sizes that
exceed the standard range shall be increased or decreased in sequence according to the
grade values and principles specified in the standard.
5 Requirements
5.1 Grading regulations
5.1.1 The quality grades are divided into superior products, first-class products and
qualified products.
5.1.2 The internal quality is graded by batch, and the appearance quality is graded by
piece. It is graded by the lowest grade of the two.
6.1.1.2 Before the tests of dimensional change rate after washing and distortion rate
after washing, the humidity shall be adjusted according to the standard atmosphere
specified in GB/T 6529, and the test can be carried out after the humidity adjustment
meets the requirements.
6.1.2 Test methods
6.1.2.1 Fiber content
According to the provisions of FZ/T 01057 (all parts), GB/T 2910 (all parts), GB/T
38015, FZ/T 01026, FZ/T 01101, etc.
6.1.2.2 Formaldehyde content
According to the provisions of GB/T 2912.1.
6.1.2.3 pH value
According to the provisions of GB/T 7573.
6.1.2.4 Odor
According to the provisions of GB 18401.
6.1.2.5 Decomposable carcinogenic aromatic amine dyes
According to the provisions of GB/T 17592.
6.1.2.6 Bursting strength
According to the provisions of GB/T 19976-2005, the diameter of the steel ball is (38
± 0.02) mm.
6.1.2.7 Dimensional change rate after washing
6.1.2.7.1 Measurement position
The vertical length of the garment is calculated based on the average value of the front,
back, left and right sides of the garment, and the horizontal length of the garment is
calculated based on the measurement value of the front side. When measuring, marks
are made for measurement after washing. The measurement position is shown in Figure
1.
6.1.2.7.5 Result calculation
Calculate the vertical and horizontal dimensional change rates after washing according
to formula (1), with a negative sign (-) indicating dimensional shrinkage and a positive
sign (+) indicating dimensional elongation (reverse expansion). Take the arithmetic
mean of the three samples as the test result. If there are both shrinkage and reverse
expansion test results, take the arithmetic mean of the two shrinkage or elongation
samples as the test result. The final result is rounded off according to the provisions of
GB/T 8170 and retain one decimal place.
where:
A - the vertical or horizontal dimensional change rate after washing;
L1 - the vertical ...