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This standard is developed in accordance with the rules given in GB/T 1.1-2020 Directives for standardization — Part 1: Rules for the structure and drafting of standardizing documents.
This standard replaces GB/T 28011-2011 Shanks for Footwear. The following main technical changes have been made with respect to GB/T 28011-2011:
——The document title in Chinese is renamed;
——The “Scope” is modified (see Clause 1 in this standard and Clause 1 of 2011 Edition);
——The definitions of "type I shanks", "type L shanks" and "type Y shanks” are added (see 3.1, 3.2 and 3.3);
——The product classification is modified (see Clause 4 in this standard and Clause 4 of 2011 Edition);
——The requirements for “Marking” are modified (see 5.1 in this standard and 5.1 of 2011 Edition);
——The requirements for “Appearance quality” are modified (see 5.2 in this standard and 5.2 of 2011 Edition);
——The requirements for “Longitudinal stiffness” are modified (see 5.4 in this standard and 5.4 of 2011 Edition);
——The requirements for “Fatigue Resistance” are modified (see 5.5 in this standard and 5.5 of 2011 Edition);
——The requirements for “Hardness” are modified (see 5.6 in this standard and 5.6 of 2011 Edition);
——The requirements for “Bending property” are modified (see 5.7 in this standard and 5.7 of 2011 Edition);
——Figures for length measurement of type I, type L, and type Y shanks are added (see 7.2.1, 7.2.2 and 7.2.3);
——The test method for “Bending property” is modified (see 7.8 in this standard and 7.8 of 2011 Edition);
——The method for “Result Judgment” is modified (see 8.3 in this standard and 8.3 of 2011 Edition).
Attention is drawn to the possibility that some of the elements of this standard may be the subject of patent rights. The issue body of this standard shall not be responsible for identifying any or all such patent rights.
This standard was proposed by the China National Light Industry Council.
This Standard is under the jurisdiction of National Technical Committee (SAC/TC 305) on shoe-making of Standardization Administration of China.
The previous edition of this standard is as follows:
——GB/T 28011-2011.
Shanks for footwear
1 Scope
This standard specifies the product classification, technical requirements, testing methods, inspection rules and marking, packaging, transportation and storage of the shanks of footwear (including boots).
This standard is applicable to the shanks for shoes in and above 200 of shoe size (including boots).
This standard is not applicable to wooden shanks or the like.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this standard and are indispensable for its application. For dated references, only the dated edition is applicable to this standard. For undated references, the latest editions of the normative documents (including all the amendments) are applicable to this standard.
GB/T 191 Packaging — Pictorial marking for handling of goods
GB/T 230.1 Metallic materials — Rockwell hardness test — Part 1: Test method
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 given in GB/T 2703 and the following apply.
3.1
type L shank
a shank shaped in the letter L
Note: It is mostly used for female high-heeled shoes, and its rear bends down and forms short side, and the shank is embedded at the molding bottom heel.
3.2
type Y shank
a shank shaped in the letter Y
Note: Besides conventional functions, it is (also) of some auxiliary functions.
3.3
type I shank
a shank shaped in the letter I
Note: It is mostly used in medium and high heels for male and female.
4 Product classification
Shanks may be classified according to the following conditions:
——It may be classified according to using objects: male shoes shanks, female shoes shanks and children shoes shanks;
——It may be classified according to the shapes of shanks: type I shanks, type L shanks and type Y shanks;
——It may be classified according to the shank materials: metallic shanks and non-metallic shanks.
5 Technical requirements
5.1 Marking
5.1.1 The applicable heel height or applicable heel height range shall be marked on the shank, which is denoted by Arabic numerals, in mm.
5.1.2 The shanks taken out of the shoes is not subjected to inspection, which shall be marked.
5.2 Appearance quality
The shanks surface shall be smooth and flat, free from burr, rusting erosion and cracks, and the positions of the string, tack hole and prong shall be accurate.
5.3 Dimension
5.3.1 Dimension tolerance
The length tolerance is the difference between the maximum value and the minimum value in the measured values of the samples, and for the same lot, the length tolerance is not larger than 2.0mm; and the width tolerance and the thickness tolerance are the difference between the maximum and minimum values of the measured values corresponding to the head and tail of the shank, and for the same lot, the width tolerance is not larger than 1.0mm, the thickness tolerance is not larger than 0.2mm.
Foreword i
1 Scope
2 Normative references
3 Terms and definitions
4 Product classification
5 Technical requirements
6 Sample quantity
7 Test method
8 Inspection rules
9 Marking, packaging, transportation and storage
