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GB/T 21396-2022 English PDF (GBT21396-2022)

GB/T 21396-2022 English PDF (GBT21396-2022)

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GB/T 21396-2022: Footwear - Test methods for whole shoe - Upper sole adhesion

GB/T 21396-2022
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 61.060
CCS Y 78
GB/T 21396-2022 / ISO 17708:2018
Replacing GB/T 21396-2008
Footwear – Test Methods for While Shoe – Upper Sole Adhesion
(ISO 17708:2018, IDT)
ISSUED ON: OCTOBER 12, 2022
IMPLEMENTED ON: OCTOBER 12, 2022
Issued by: State Administration for Market Regulation;
Standardization Administration of the People’s Republic of China.
Table of Contents
Foreword ... 3
1 Scope ... 4
2 Normative References ... 4
3 Terms and Definitions ... 5
4 Apparatus and Material ... 5
5 Sampling and Conditioning ... 5
6 Test Method ... 8
7 Expression of Results ... 10
8 Test Report ... 12
Annex A (Normative) Ageing Process Conditions for the Upper-Sole Bonding Test 14 Bibliography ... 16
Foreword
This Document was drafted as per the rules specified in GB/T 1.1-2020 Directives for Standardization – Part 1: Rules for the Structure and Drafting of Standardizing Documents. This Document replaced GB/T 21396-2008 Footwear - Test Methods for Whole Shoe - Upper Sole Adhesion. Compared with GB/T 21396-2008, the major technical changes of this Document are as follows besides the structural adjustments and editorial modifications: --- Increase the accuracy requirements of width measuring equipment (see 4.3 of this Edition);
--- Increase sampling area restrictions (see 5.3.1, 5.3.2, 5.3.3 of this Edition); --- Change the sampling requirements for structure types b, c, d and e (see 5.3.2 of this Edition; 5.3.2 of the 2008 Edition).
This Document equivalently adopts ISO 17708:2018 Footwear – Test Methods for While Shoe – Upper Sole Adhesion.
Please note some contents of this Document may involve patents. The issuing agency of this Document shall not assume the responsibility to identify these patents. This Document was proposed by China Petroleum and Chemical Industry Federation. This Document shall be under the jurisdiction of National Technical Committee on Rubber and Rubber Product of Standardization Administration of China (SAC/TC 35).
Drafting organizations of this Document: Putian Hengshun Sports Goods Co., Ltd.; Shanghai Institute of Quality Inspection and Technical Research; Great Cary (Taicang) Quality Technology Inspection Center Co., Ltd.; Xiamen YiZheng ANNO Health Care Products Co., Ltd.; SANLIUYIDU (China) Co., Ltd.; Zhongqiao Sports Co., Ltd.; Jihua 3517 Rubber Products Co., Ltd.; Zhejiang Zhongrui Rubber High Polymer Material Co., Ltd.; China Leather and Footwear Research Institute Co., Ltd.; Jinjiang Testing Institute of Quality and Metrology; Quanzhou Institute of Standardization; and Dongying Red Star Labor Insurance Products Co., Ltd.
Chief drafting staffs of this Document: Xu Chunshu, Chen Yahua, Fei Guoping, Hong Xiaojie, Zeng Tie, Zhang Beizhan, Yang Yinjun, Wang Yihao, Lin Zhijie, Jiang Jiashuo, Dai Huilian, Li Haihong, Shao LiJun, Zhou Jiangfan, Liu Feng, Bo Qijun, and Ma Yanhong. This Document was first-time published in 2008; and it is first-time revised hereby. Footwear – Test Methods for While Shoe – Upper Sole Adhesion
1 Scope
This Document describes a test method for determining the resistance to separation of the upper from the outsole, for separating adjacent layers of the outsole or for causing tear failure of the upper or the sole. It also defines conditions of ageing that can be used for production control. This Document is applicable to all types of footwear (cementing, vulcanization, injection moulding, etc.) where the evaluation of sole adhesion on the upper is needed and where the upper is continuously assembled (closed shoe).
NOTE 1: In all cases the objective is to test the bond strength nearest to the edge of the assembly. NOTE 2: The test need not be carried out when the bond has been made by grindery (using, for example, nails or screws) or stitching.
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.
ISO 7500-1 Metallic materials – Calibration and verification of static uniaxial testing machines – Part 1: Tension/compression testing machines – Calibration and verification of the force-measuring systems
NOTE: GB/T 16825.1-2008 Verification of static uniaxial testing machines - Part 1 : Tension/compression testing machines - Verification and calibration of the force-measuring system (ISO 7500-1:2004, IDT)
ISO 18454 Footwear – Standard atmospheres for conditioning and testing of footwear and components for footwear
NTOE: GB/T 22049-2019 Footwear - Standard atmospheres for conditioning and testing of footwear and components for footwear (ISO 18454:2018, IDT)
3 Terms and Definitions
For the purposes of this Document, the following terms and definitions apply. 3.1 Upper-sole adhesion
Force required to separate the sole-upper bonding.
4 Apparatus and Material
The following apparatus and material shall be used.
4.1 Cutting device.
Sharp tool for clean cutting of the test pieces.
4.2 Tensile testing machine.
The tensile-testing machine shall comply with the requirements of ISO 7500-1 to an accuracy corresponding to class 2, with a constant rate of traverse of 100 mm/min ± 10 mm/min, and it shall be able to measure a force range of 0 N to 600 N. The machine shall be fitted with either pincer or flat jaws (depending on the type of construction of the test sample), 25 mm to 30 mm wide, capable of firmly gripping the test pieces.
A low-inertia machine having autographic force recording facilities is essential. 4.3 Measuring device.
Calibrated device for measuring of the width of the upper bonding margin, with an accuracy of at least ±0.5 mm.
5 Sampling and Conditioning
5.1 Footwear conditioning
Before dismantling and cutting of the test pieces, condition the footwear according to ISO 18454 for at least 24 h, and, if required, carry out an ageing process according to Annex A. NOTE: Some adhesives cannot reach full strength for some time after application, therefore, when samples are taken directly from production, allow at least 72 h conditioning before carrying out the test. 5.2 Number of samples
For each model, the minimum number of samples shall be two items of footwear.

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