GB/T 31900-2024Woven children's clothing (English PDF)

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.

4.5.1 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

5.1 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

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.