Foreword
Codeofchina.com is in charge of this English translation. In case of any doubt about the English translation, the Chinese original shall be considered authoritative.
This document 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.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. The issuing body of this document shall not be held responsible for identifying any or all such patent rights.
This standard was proposed by and is under the jurisdiction of China National Light Industry Council.
This document is under the jurisdiction of National Technical Committee on Footwear of Standardization Administration of China (SAC/TC 305).
Footwear - Test methods for socks - Static compression set
1 Scope
This document describes the test method for static compression set of socks.
This document is applicable to the static compression set of various microcellular foam socks such as ethylene-vinyl acetate copolymer (EVA) and polyurethane (PU) foam.
2 Normative references
The following documents contain requirements which, through reference in this text, constitute provisions 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 2703 Footwear - Vocabulary
GB/T 22049 Footwear - Standard atmospheres for conditioning and testing of footwear and components for footwear
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
compression set
specimen which is deformed after being compressed by external force, and when the external force is removed, the geometric size changes in the direction of the force
4 Principle
Where the sock is compressed by external force, its microcellular foam substrate will deform along the stress direction. Where the external force is removed, the microcellular foam substrate still cannot recover to its original geometric size. In this standard, the sock is subjected to static compression under a certain pressure and a certain time, and the compression deformation performance of the sock is evaluated by the geometric size change rate produced in the stress direction.
Foreword i
1 Scope
2 Normative references
3 Terms and definitions
4 Principle
5 Instruments and equipment
6 Sampling and conditioning
7 Test method
8 Test result
9 Test report
