QB/T 4546-2021Children leather sandals (English PDF)

5.1 General requirements

5.1.1 Product identification shall meet the requirements of QB/T 2673.

5.1.2 After-sales quality judgment is shown in Appendix A.

5.2 Sensory quality

Sensory quality requirements are shown in Table 1. Items 1 ~ 5 are the primary items;

items 6 ~ 9 are the subsidiary items.

d) Other cases that are not suitable for testing the upper and sole peeling strength.

5.3.3.3 The upper and sole peeling strength shall not be less than 40 N/cm.

5.3.3.4 If the material is torn and the peeling layer is not opened during the upper and sole peeling strength test, the peeling strength shall not be less than 30 N/cm.

5.3.4 Outsole hardness

5.3.4.1 The hardness of the solid outsole shall be 45 Shore A ~ 65 Shore A. The hardness of the microporous foam outsole shall be 45 Shore C ~ 65 Shore C. The composite outsole shall meet the hardness requirements of the solid outsole and/or microporous foam outsole according to the type of material.

5.3.4.2 The outsole hardness of natural leather outsoles and children's leather sandals

with an outsole thickness of less than 3 mm is not measured.

5.3.5 Upper strap pull-out strength (or upper strap pull-out force)

The upper strap pull-out strength of children's leather sandals manufactured by bonding process shall not be less than 70 N/cm. If the material is torn and the upper and sole joints are not pulled apart, the upper strap pull-out strength shall not be less than 30

N/cm. The upper strap pull-out force of children's leather sandals manufactured by non- bonding process (rivet nailing, etc.) shall not be less than 70 N.

5.3.6 Fiberboard flex index

Fiberboard flex index shall not be less than 1.9.

5.3.7 Lining and insole friction color fastness

The lining and insole friction color fastness staining grade shall not be less than grade

3 (gray scale)

5.3.8 Shank

5.3.8.1 For children's leather sandals with a shoe size of 200 or more, a heel height of more than 20 mm and a heel opening height of more than 8 mm, it shall have a shank or other rigid support material. The length, longitudinal stiffness, hardness, bending performance of the shank shall meet the requirements of GB/T 28011.

5.3.8.2 There is no requirement for the shank of children's leather sandals with injection molded midsoles. The longitudinal stiffness of injection molded midsoles shall meet the requirements of QB/T 4862.

5.3.8.3 The shank of wedge heels is not tested; the shank of wooden or hard plastic molded soles (hardness >= 80 Shore A) is not tested.

5.3.9 Yellowing resistance

The yellowing resistance of the upper and sole edge (non-ground contact part) of children's leather sandals shall not be less than grade 3. White or light-colored uppers and sole edges (non-ground contact parts) are tested for yellowing resistance; the rest are exempted from testing.

5.3.10 Bonding strength between outsole and outer midsole

The bonding strength between outsole and outer midsole shall not be less than 20 N/cm;

it shall not be less than 15 N/cm when the microporous bottom is torn but the glue layer is not opened.

6.1 Sensory quality

It is tested according to GB/T 3903.5.

6.2 Folding resistance

It is tested according to GB/T 3903.1.

6.3 Abrasion resistance

It is tested according to GB/T 3903.2-2017. Test conditions: Apply a pressure of (4.9 ±

0.1) N and wear continuously for 20 min. If there is no flat area on the outsole foam material, the abrasion resistance test is not performed.

6.4 Upper and sole peeling strength

It is tested according to GB/T 3903.3-2011. Test conditions: blade width (10 ± 0.2) mm.

6.5 Outsole hardness

It is tested according to GB/T 3903.4-2017. When testing the hardness of the foamed outsole, the surface dense layer is not polished. For the outsole made of a single material, any part that meets the standard requirements shall be tested; for the composite outsole, the stress point shall be tested. The patch material shall be tested together with the whole shoe; different materials at the stress point shall be tested and the results expressed separately.

6.6 Upper pull-out strength

6.6.1 Specimen preparation: The sample is 1 pair. Cut the upper and sole into 10 mm wide strips; take one specimen from the inside and outside. For specimens with an upper width of less than 10 mm, the sole remains in its original state. After the upper is cut in

It is tested according to GB/T 28011. Take 2 shanks to test the length, longitudinal stiffness, hardness first; then select the shank with the largest hardness for bending performance test. The longitudinal stiffness of the injection molded midsole shall be tested according to QB/T 4862.

6.11 Yellowing resistance

6.11.1 Judgment of light-colored materials: According to GB/T 4841.3, it is light color if it is not darker than 1/12 of the standard depth of dyeing.

6.11.2 It is tested according to method A in HG/T 3689-2014; the irradiation time is 6 h. When the sampling volume is insufficient, the same batch of materials can be taken for testing.

6.12 Adhesion strength between outsole and outer midsole

6.12.1 Cut the specimens according to GB/T 21396-2008 and test them. The number of samples is 1 pair; 1 specimen is taken for each sole. The test result is the lower value of the test results of the two shoes.

6.12.2 If the sample sole is made of hard material and is difficult to cut, use a cutter to cut 50 mm × 15 mm of the outer soft material without cutting the hard material; then inspect according to GB/T 21396-2008.

7.1 If the primary items of labeling, physical, mechanical properties and sensory quality

meet the requirements of this document, whilst not more than two subsidiary items of sensory quality do not meet the requirements of this document, the product is judged to be qualified.

7.2 If one of the following situations occurs, the product is judged to be unqualified:

a) The labeling does not meet the requirements of this document;

b) The physical and mechanical properties do not meet the requirements of this document;

c) One or more of the primary items of sensory quality do not meet the requirements of this document;

d) More than two of the subsidiary items of sensory quality do not meet the requirements of this document.

Appendix A (Informative)

After-sales quality assessment of children's leather sandals

A.1 After-sales service period

It can be determined by the enterprise according to the product grade and clearly stated in the after-sales service provisions.

A.2 After-sales quality judgement

The following problems that occur under normal wear during the after-sales service period can be judged as quality problems:

a) Failing to meet the quality requirements of qualified products in the product standards;

b) Protruding nail tips (heads) in the shoes, uneven inside of the shoes affecting wearing;

c) Upper cracks, broken or cracked upper feet, white frost, discoloration, etc. The front upper is obviously loose, the coating layer falls off or cracks;

d) Open thread, open glue;

e) The main heel or toe cap is deformed;

f) The heel is deformed, cracked, broken or fallen. The heel falls off;

g) The lining or inner pad is obviously discolored and contaminates the socks.

Lining worn out;

h) Outer sole or inner sole cracked, broken or uneven, affecting wear;

i) Waist strips unbonded, broken;

j) Shanks soft, broken or loose;

k) Other problems that seriously affect appearance or wear.

A.3 Inspection method

A.3.1 Sensory quality shall be inspected in accordance with GB/T 3903.5-2011.

A.3.2 Discoloration: Use white absorbent cotton or gauze soaked with clean water (no

water dripping when pressed by fingers) to rub the discolored parts (inside of upper,

......