GB/T 31900-2024 PDF English
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| GB/T 31900-2024 | English | 245 |
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| GB/T 31900-2015 | English | 85 |
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GB/T 31900-2024: Woven children’s clothing---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT31900-2024
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 61.020
CCS Y 76
Replacing GB/T 31900-2015
Woven Children’s Clothing
Issued on: NOVEMBER 28, 2024
Implemented on: DECEMBER 1, 2026
Issued by. State Administration for Market Regulation;
Standardization Administration of the People’s Republic of China.
Table of Contents
Foreword... 3
1 Scope... 5
2 Normative References... 5
3 Terms and Definitions... 7
4 Requirements... 7
5 Test Methods... 15
6 Inspection Rules... 19
7 Marking, Packaging, Transportation and Storage... 25
Woven Children’s Clothing
1 Scope
This Document specifies the requirements, inspection rules, as well as marking, packaging,
transportation and storage of woven children's clothing; and describes the corresponding test
methods.
This Document applies to children's clothing produced with textile woven fabrics as the main
fabric.
This Document does not apply to clothing filled with down feathers, natural fibers, chemical
fibers and their blends in the main parts.
This Document does not apply to clothing for infants and young children aged 36 months and
below.
2 Normative References
The provisions in following documents become the essential provisions of this Document
through reference in this Document. For the dated documents, only the versions with the dates
indicated are applicable to this Document; for the undated documents, only the latest version
(including all the amendments) is applicable to this Document.
GB/T 250 Textiles - Tests for color fastness - Grey scale for assessing change in color
GB/T 1335 (all parts) Size designation of clothes
GB/T 3917.2 Textiles - Tear properties of fabrics - Part 2.Determination of tear force of
trouser-shaped test specimens (Single tear method)
GB/T 3921-2008 Textiles - Tests for color fastness - Color fastness to washing with soap
or soap and soda
GB/T 4802.1-2008 Textiles - Determination of fabric propensity to surface fuzzing and to
pilling - Part 1.Circular locus method
GB/T 4841.3 Color cards of standard depths for dyeing with dyestuffs 2/1, 1/3, 1/6, 1/12,
1/25
GB/T 5296.4 Instructions for use of products of consumer interest - Part 4.Textiles and
apparel
GB/T 5711 Textiles - Tests for color fastness – Color fastness to drycleaning using
FZ/T 80004 Rule for garments delivery inspection
FZ/T 80007.3 Dry wash resistance test method for garments used adhesive interlining
Sample photos of appearance defects of men's and women's thin and cotton clothing, and
men's and women's and children's thin clothing (Ministry of Textile Industry of the
People's Republic of China)
3 Terms and Definitions
For the purposes of this Document, the terms and definitions given in GB 31701 and GB/T
15557 apply.
4 Requirements
4.1 Instructions for use
The instructions for use shall comply with the provisions of GB/T 5296.4 and GB 31701.
4.2 Size and specification
4.2.1 The setting of size shall be according to the provisions of GB/T 1335 (all parts).
4.2.2 The specifications of the main parts of the finished product shall be properly designed
according to the relevant provisions of GB/T 1335 (all parts).
4.3 Raw and auxiliary materials
The fabrics and linings shall meet the relevant requirements of this Document. The used linings,
seams and other auxiliary materials shall be suitable for the fabrics. Buttons, decorative buckles,
zippers and other accessories shall have smooth surfaces, no burrs, no defects, no imperfections,
no touchable sharp points and sharp edges. The zipper meshes well and smoothly.
NOTE. Touchable sharp points and sharp edges refer to sharp points and edges on the finished product
that may cause harm to human skin.
4.4 Direction of warp and weft yarns
The yarn skewness of the collar, body, sleeves and trousers shall not exceed 3%; and the bottom
edge of the front body shall not be upturned.
4.5 Strip matching and plaid matching
4.5.1 Fabrics with obvious stripes and plaids with a width of 1.0 cm or more shall meet the
requirements of Table 1, except for special designs.
tightness of upper and lower threads, no skipped threads or broken threads; the starting and
ending needle points and pocket openings shall be sewn firmly with backstitching. The
armholes, sleeve seams, hem seams, bottom edges, cuffs, front facing inside edge and the other
parts shall take overlapping stitches; and the back rise of the trousers shall be sewn with double
threads or chain threads.
4.8.3 The exposed seam allowance shall be overlocked or heat-cut; and the seam allowance of
each part shall be no less than 0.8 cm, except for special parts such as insert pockets, collar
facings, and front edge of plackets. The top stitching, binding, and layering shall be flat and of
uniform width. There shall be no skipping stitches in the collar and placket. There shall be no
continuous skipping stitches or more than one single skipping stitch within 30 cm in other parts.
4.8.4 The collar surface is flat and not warped; the collar surface and lining are of appropriate
tightness; the collar (compared with the shoulder seam of the collar) is not skewed; and there
shall be no connection in the exposed line of the collar.
4.8.5 The diagonal is round and smooth at sleeve cap; and the front and back sleeves are
consistent. The length and position of the darts are consistent; the fine pleats (including tuck
lines) are uniform; and the width of the pleats is consistent; the length of the front fly and the
under fly is appropriate; and the facing doesn’t lean out of front edge.
4.8.6 The pocket cloth and padding shall be folded or oversewn to prevent the edge yarn from
falling off; the pocket and the pocket cover shall be square and smooth.
4.8.7 The elastic waistband of the pants or waistband of skirt shall be uniform in tightness and
width.
4.8.8 The buttonholes shall be accurately positioned, of appropriate size; and the buttons and
eyes shall be aligned, neat and firm. The four-buttons shall fit well, without deformation or
overtightening; and the zipper tape of the placket shall be flat and straight. The buttons shall
not be nailed on the single layer of cloth (excluding decorative button).
4.8.9 The side seams of the pants (skirts) shall be straight; the distortion rate of the pants shall
not exceed 2%, the distortion rate of the tube skirt products shall not exceed 3%, and the shorts
above the knees are not tested.
4.8.10 The symmetrical parts are basically consistent.
4.8.11 Decorations (embroidery, inlay, etc.) shall be firm and smooth, with no missing
embroidery or no overlapping of printing.
4.8.12 The position of trademarks and durable labels shall be upright and smooth.
4.9 Allowable deviation of specifications and dimensions
The allowable deviation of specifications and dimensions of the main parts of the finished
5 Test Methods
5.1 Inspection tools
5.1.1 Measuring ruler, non-retractable, with a graduation value of 1 mm.
5.1.2 Gray scale for assessing change in color (GB/T 250).
5.1.3 1/12 color cards of standard depths for dyeing with dyestuffs (GB/T 4841.3).
5.1.4 Sample photos of appearance defects of men's and women's thin, cotton clothing, and
men's and women's children's thin clothing.
5.2 Specification determination
The measurement method of the specifications and dimensions of the main parts shall be
determined according to the method described in GB/T 31907.
5.3 Appearance determination
5.3.1 Appearance inspection is generally carried out by lighting, with an illumination of no less
than 600 lx. If conditions permit, it can also be illuminated by northern sky light.
5.3.2 The sharpness of the tip and edge of the accessory shall be tested according to the
provisions of GB/T 31702.
5.3.3 The degree of yarn skewness in the warp and weft directions shall be determined in
accordance with the provisions of GB/T 14801 and the results shall be calculated using Formula
(1).
Where.
S - the degree of yarn skewness in the warp or weft direction, in %;
d - the maximum vertical distance between the warp or weft yarn and the ruler, in mm;
W - the width of the measuring part, in mm.
5.3.4 When evaluating the degree of color difference, the yarn direction of the evaluated part
shall be consistent. The incident light shall be at an angle of about 45° to the fabric surface; and
the observation direction shall be perpendicular to the fabric surface. Visual inspection shall be
performed at a distance of 60 cm and compared with the sample scale in GB/T 250.
5.3.5 When determining the allowable degree of appearance defects, visual inspection shall be
are both shrinkage and elongation test results, the average value of the 2 shrinkage (or
elongation) specimens shall be taken as the test result.
5.4.3 The color fastness to dry cleaning shall be determined according to the method described
in GB/T 5711.
5.4.4 The color fastness to washing with soap shall be determined according to the method
described in Method A (1) of GB/T 3921-2008.
5.4.5 The color fastness to transfer in joints shall be determined according to the method
described in Method A of GB/T 31127-2014.
5.4.6 The color fastness to light shall be determined according to the method described in GB/T
8427-2019, where the exposure shall be carried out under normal conditions and the first stage
shall be exposed according to Method 3.
5.4.7 Phenolic yellowing shall be determined according to the method described in GB/T 29778.
5.4.8 Pilling shall be determined according to the method described in GB/T 4802.1-2008, using
parameter D for testing (where worsted fabrics and combed worsted-like fabrics are tested
according to parameter E; and woolen fabrics, woolen-like fabrics and loose-structured fabrics
are tested according to parameter F).
5.4.9 The tear strength shall be determined according to the method described in GB/T 3917.2.
5.4.10 Cords and drawstrings on children’s clothing shall be tested according to the method
described in GB/T 22702.
5.4.11 Appearance test method after washing. After the sample is washed and dried as specified
in 5.4.2, it is evaluated under the appearance test conditions specified in 5.3.1 and in
combination with the requirements of Table 5 according to the evaluation method described in
GB/T 21294, where.
a) The appearance flatness after washing is measured according to the method described in
GB/T 13769;
b) The appearance flatness of the seam after washing is measured according to the method
described in GB/T 13771;
c) The twist rate after washing is measured according to the method described in 5.3.7;
d) The color change evaluation method is as follows. Before washing, select a sample with
a color difference of more than Grade 4-5 from the sample to be washed and keep it as a
retention sample. After washing, the sample and the retention sample are evaluated for
the degree of color change according to GB/T 250.If the color difference between the
samples is not more than Grade 4-5, directly take a sample from the part of the sample
to be washed that does not affect the structure of the garment as the retention sample.
5.4.12 Other physical and chemical property items. fiber content, formaldehyde content, pH,
decomposable carcinogenic aromatic amine dyes, odor, color fastness to rubbing, color fastness
to perspiration, color fastness to water, seam cracking degree, seam strength, and peeling
strength of adhesive interlining shall be determined according to the method described in GB/T
21294.Among them, the arbitration test of color fastness to washing with soap, color fastness
to dry cleaning, color fastness to perspiration, and color fastness to water shall select single
fiber interlining.
5.4.13 For test items where the sampling location is not mentioned, samples can be taken from
the finished product according to the test needs.
6 Inspection Rules
6.1 Classification of the inspection
6.1.1 The inspection of the finished product is divided into exit-factory inspection and type
inspection. The timing of type inspection is based on the actual situation of the manufacturer
or the provisions of the contract agreement. It is generally carried out when the production is
transferred to other factory, the production is resumed after suspension, or there are major
changes in raw materials or processes.
6.1.2 Exit-factory inspection shall be in accordance with the provisions of Clause 4, except for
4.11.The rules for exit-factory inspection of finished products shall be in accordance with the
provisions of FZ/T 80004.
6.1.3 Type inspection shall be in accordance with the provisions of Clause 4.
6.2 Appearance quality grade and defect classification rules
6.2.1 Classification of appearance quality grade
The quality grade of finished products is based on the existence of defects and their severity.
The single product in the sample is graded according to the number of defects and their severity;
and the batch grade is divided according to the number of single products in the sample.
6.2.2 Classification of the appearance defects
A single product that does not meet the technical requirements specified in this Document
constitutes a defect.
According to the degree of non-compliance of the product with this Document and the impact
on the performance and appearance of the product, defects are divided into 3 categories.
a) Severe defects. Defects that seriously reduce the performance of the product and seriously
affect the appearance of the product.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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