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GB/T 28011-2021 PDF in English


GB/T 28011-2021 (GB/T28011-2021, GBT 28011-2021, GBT28011-2021)
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GB/T 28011-2021: PDF in English (GBT 28011-2021)

GB/T 28011-2021
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 61.060
CCS Y 78
GB/T 28011-2021
Replacing GB/T 28011-2011
Shanks for footwear
ISSUED ON: AUGUST 20, 2021
IMPLEMENTED ON: MARCH 01, 2022
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 ... 5 
4 Product classification ... 6 
5 Technical requirements ... 6 
6 Number of specimens ... 9 
7 Test methods ... 9 
8 Inspection rules ... 13 
9 Marks, packaging, transportation, storage ... 14 
Shanks for footwear
1 Scope
This Standard specifies product classification, technical requirements, test
methods, inspection rules and marks, packaging, transportation, and storage
for shanks for shoes (including boots).
This Standard is applicable to shanks for shoes of size 200 and above
(including boots).
This Standard is applicable to wooden shanks or similar 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 191, Packaging and storage marks
GB/T 230.1, Metallic materials - Rockwell hardness test - Part 1: Test method
(scales A, B, C, D, E, F, G, H, K, N, T)
GB/T 2703, Footwear - Vocabulary
GB/T 3903.4-2017, Footwear - Test methods for whole shoe - Hardness
GB/T 3903.34, Footwear - Test methods for shanks - Longitudinal stiffness
GB/T 3903.35, Footwear - Test methods for shanks - Fatigue resistance
3 Terms and definitions
For the purposes of this document, the terms and definitions defined in GB/T
2703 as well as the followings apply.
3.1 type L shank
A shank shaped like the letter L.
NOTE: Mostly used for women's high-heeled shoes, the back of which bends down to form
a short side embedded in the heel.
3.2 type Y shank
A shank shaped like the letter Y.
NOTE: In addition to regular functions, it (also) has some auxiliary functions.
3.3 type I shank
A shank shaped like the letter I.
NOTE: Mostly used in mid-high heels for men and women.
4 Product classification
The shanks can be classified according to the following conditions:
- According to the object of use, it is classified into: men's shoe shank,
women's shoe shank, and children's shoe shank;
- According to the shape of the shank, it is classified into: type I shank, type
L shank, and type Y shank;
- According to the shank material, it is classified into: metal shank and non-
metal shank.
5 Technical requirements
5.1 Marks
5.1.1 The shank shall be marked with the effective heel height or the applicable
effective heel height range, expressed in Arabic numerals, and the unit is
millimeters.
5.1.2 The shank taken out of the shoe does not check the mark.
5.2 Sensory quality
The surface of the shank has no burrs, corrosion, cracks, bending deformation,
smooth and flat. The positions of ribs, nail holes and forks are correct.
5.3 Size
5.3.1 Size tolerance
The length tolerance is the difference between the maximum value and the
Use vernier calipers with an accuracy of not less than 0.05mm. Measure a point
on the head and tail of the shank without burrs respectively. The result is to one
decimal place. The width values of the head and tail of each shank are
expressed separately.
7.4 Shank thickness
Use vernier calipers with an accuracy of not less than 0.05mm. Measure a point
on the head and tail of the shank without burrs respectively. The arithmetic
mean of the thickness of the head and tail is the thickness of the shank. The
result is to one decimal place. The thickness value of each shank is indicated
separately.
7.5 Longitudinal stiffness
Test according to GB/T 3903.34. The test results of each shank are shown
separately.
7.6 Fatigue resistance
Test according to GB/T 3903.35. The test results of each shank are shown
separately.
7.7 Hardness
Test according to GB/T 230.1 for metal shanks. Test according to GB/T 3903.4-
2017 for non-metal shanks. Test on the flat part of the sample. The hardness
value of each shank is indicated separately.
7.8 Bending performance
7.8.1 Test equipment
The shank bending performance tester (see Figure 4), has point of support and
movable roller. Make the movable roller rotate 180° around the central column
with a diameter of ϕ10 mm.
8.2 Shank inspection in footwear products
When footwear products are spot-checked and submitted for inspection, if the
number of specimens cannot meet the requirements of this Standard, the two
shanks taken from the same pair of shoes shall be used as the specimen to
inspect according to the requirements of the product standards implemented
for footwear products. Two pieces are inspected for sensory quality, size and
hardness. After that, one shank is tested for fatigue resistance, and one is
tested for other items.
8.3 Result judgment
8.3.1 Batch judgement
If in each individual test, if one or more shanks fail to meet the requirements of
this Standard, the item will be judged as nonconforming. If one or more of the
inspected items are nonconforming, the batch of products shall be deemed
nonconforming. Among them, when mark, length, longitudinal rigidity, hardness,
and bending performance have 1 or more unqualified items, no re-inspection is
allowed, and the batch of products are judged to be nonconforming. When
sensory quality, size tolerance, and fatigue resistance have 1 or more
nonconforming items, it can be sampled again from the original batch of
products. Double the number of samples. Re-inspect the nonconforming items.
Judgment is based on the results of the re-inspection.
8.3.2 Shoe shank judgement
Remove the shank from the shoe. Determine the individual test results of the
shank based on the effective heel height of the tested shoe. The performance
of the shank shall conform to the product standard corresponding to the tested
shoe.
9 Marks, packaging, transportation, storage
9.1 Marks
9.1.1 Mark content on domestic product packaging
Product name, specification (length, width, thickness), applicable effective heel
height (or applicable effective heel height range), quantity, manufacturer name,
factory address, telephone number, postal code, trademark, production date,
moisture-proof mark, certificate and implementation standard number.
......
 
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.