This part is developed in accordance with the rules given in GB/T 1.1-2009.
This Part replaces GB/T 3903.41-2008 Footwear - Test methods for uppers and lining - Flex resistance, and the following main technical changes have been made with respect to GB/T 3903.41-2008:
——The normative references are modified (see Clause 2, Clause 2 of Edition 2008);
——The term “surface” is added (see 3.2);
——The “General” part is added (see Clause 4);
——The requirements for "wet tests and cold tests" in "sampling and conditioning" are added (see 6.3 and 6.4);
——The number of tests for taking the test specimen from the machine is modified (see 7.2.6; 6.2.7 of Edition 2008);
——The requirements for record content of materials with coating on the surface after testing is modified (see 7.2.8; 6.2.9 of Edition 2008);
——The requirement for recording “Labeling” in the test report is added (see Clause 8).
This part, by means of translation, is identical to ISO 17694: 2016 Footwear - Test methods for uppers and lining - Flex resistance.
The Chinese documents identical to the normative international documents given in this part are as follows:
——GB/T 6682-2008 Water for analytical laboratory use - Specification and test methods (ISO 3696:1987, MOD);
——GB/T 22049-2019 Footwear - Standard atmospheres for conditioning and testing of footwear and components for footwear (ISO 18454: 2018, IDT);
——GB/T 22050-2008 Footwear - Sampling location, preparation and duration of conditioning of samples and test pieces (ISO 17709: 2004, IDT);
——QB/T 2714-2005 Leather - Physical and mechanical tests - Determination of flex resistance (ISO 5402: 2002, MOD).
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 part was proposed by China National Light Industry Council.
This part is under the jurisdiction of SAC/TC 305 National Technical Committee on Footwear of Standardization Administration of China.
The previous edition replaced by this part is as follows:
——GB/T 3903.41-2008.
Footwear - Test methods for uppers and lining - Flex resistance
1 Scope
This part of GB/T 3903 specifies a test method for determining the flex resistance of uppers and linings in order to assess the suitability for the end use.
This part is applicable to uppers and linings made of various materials.
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.
ISO 3696 Water for analytical laboratory use - Specification and test methods
ISO 5402-1:2011 Leather - Determination of flex resistance - Part 1: Flexometer method
ISO 17709 Footwear - Sampling location, preparation and duration of conditioning of samples and test pieces
ISO 18454 Footwear - Standard atmospheres for conditioning and testing of footwear and components for footwear
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
flex resistance
resistance of a material to crack or otherwise fail at flexing creases
3.2
surface
visible site of the material during the use at the shoe
Note: The visible site of the material can be by upper the grain site of the leather or the coated site of a coated textile, by lining the site of the material visible from the inside of the shoe.
4 General
Test specimens are cut from a shoe vamp or from material for shoes, folded and inserted in the test machine. The test simulates the damage caused by the inward folding of the vamp of the upper, but does not readily simulate damage occurring on outward folds. It is carried out humid, dry or in a cold climate.
5 Test apparatus and materials
The following apparatus and materials shall be used.
5.1 Test machine, in accordance with ISO 5402-1: 2011 (4.1) including the following:
5.1.1 At least four pairs of clamps. The upper clamp consists of a pair of flat plates, as shown in Figure 1. The lower clamp is fixed and lies in the same vertical plane as the upper clamp.
Dimensions in millimeters
Keys:
1——flexing angle 22°30’ ± 0°30’;
2——clamp tightening screw;
3——2 mm fillet radius;
4——horizontal axis.
Figure 1 Upper clamp dimensions
5.1.2 The upper clamp, which may perform a reciprocating action, with an flexing angle of 22°30’ ± 0°30’. The speed of oscillation shall be (100 ± 5) r/min. The distance between the upper and lower clamp, when the upper clamp is in the horizontal position, shall be (25 ± 1) mm.
5.1.3 Counter, for which the total number of cycles shall be recorded.
5.2 Press knife, (70 ± 1) mm × (45 ± 1) mm or similar tools for cutting test specimens.
5.3 Optical magnifier, with a magnification of approximately four to six times.
5.4 For wetting test specimens, the following apparatus and materials are required.
5.4.1 Glass dish, with a minimum diameter of 100 mm and depth of 25 mm.
5.4.2 Distilled or deionized water, complying with the requirements for Grade 3 of ISO 3696.
Foreword i 1 Scope 2 Normative references 3 Terms and definitions 4 General 5 Test apparatus and materials 6 Sampling and conditioning 7 Test method 8 Test report
ICS 61.060 Y 78 中华人民共和国国家标准 GB/T 3903.41—2019/ISO 17694:2016 代替GB/T 3903.41—2008 鞋类 帮面和衬里试验方法 耐折性能 Footwear—Test methods for uppers and lining—Flex resistance (ISO 17694:2016,IDT) 2019—08—30发布 2020—03—01实施 国家市场监督管理总局 中国国家标准化管理委员会 发布 前言 本部分按照GB/T 1.1—2009给出的规则起草。 本部分代替GB/T 3903.41—2008《鞋类 帮面和衬里试验方法 耐折性能》.与GB/T 3903.41—2008相比,主要技术变化如下: ——修改了规范性引用文件(见第2章,2008年版的第2章); ——增加了“表面”术语(见3.2); ——增加了概述(见第4章); ——增加了对“取样和环境调节”中“湿试验、低温试验”的要求(见6.3和6.4); ——修改了试样从机器上取下的试验次数(见7.2.6,2008年版的6.2.7); ——修改了对表面有涂层的材料试验后的记录内容要求(见7.2.8,2008年版的6.2.9); ——试验报告中增加了记录“标签”的要求(见第8章)。 本部分使用翻译法等同采用ISO 17694:2016《鞋类 帮面和衬里试验方法 耐折性能》。 与本部分中规范性引用的国际文件有一致性对应关系的我国文件如下: ——GB/T 6682—2008分析实验室用水规格和试验方法(ISO 3696:1987,MOD) ——GB/T 22049—2019鞋类 鞋类和鞋类部件环境调节及试验用标准环境(ISO 18454:2018,IDT) ——GB/T 22050—2008鞋类 样品和试样的取样位置、准备及环境调节时间(ISO 17709:2004,IDT) ——QB/T 2714—2005皮革 物理和机械试验 耐折牢度的测定(ISO 5402:2002,MOD) 请注意本文件的某些内容可能涉及专利。本文件的发布机构不承担识别这些专利的责任。 本部分由中国轻工业联合会提出。 本部分由全国制鞋标准化技术委员会(SAC/TC 305)归口。 本部分所代替标准的历次版本发布情况为: ——GB/T 3903.41—2008。 鞋类 帮面和衬里试验方法 耐折性能 1范围 GB/T 3903的本部分规定了测定帮面和衬里耐折性能的试验方法,目的是评估最终用途的适宜性。 本部分适用于各种材料的帮面和衬里。 2规范性引用文件 下列文件对于本文件的应用是必不可少的。凡是注日期的引用文件,仅注日期的版本适用于本文件。凡是不注日期的引用文件,其最新版本(包括所有的修改单)适用于本文件。 ISO 3696分析实验室用水 规格和试验方法(Water for analytical laboratory use—Specification and test methods) ISO 5402-1:2011皮革 耐折牢度的测定 第1部分:挠度仪法(Leather—Determination of flex resistance—Part 1:Flexometer method) ISO 17709鞋类 样品和试样的取样位置、准备及环境调节时间(Footwear—Sampling location,preparation and duration of conditioning of samples and test pieces) ISO 18454鞋类 鞋类和鞋类部件环境调节及试验用标准环境(Footwear—Standard atmospheres for conditioning and testing of footwear and components for footwear) 3术语和定义 下列术语和定义适用于本文件。 3.1 耐折性能 flex resistance 材料抵抗裂纹或在折痕处抵抗其他破损的能力。 3.2 表面surface 穿用鞋时,鞋材料的可见部分。 注:材料的可见部分,对于帮面,例如,皮革的粒面部分或涂层织物的涂层部分,对于衬里,指鞋内部材料的可见部分。 4概述 从鞋面或鞋材上切取试样,折叠并夹入试验机中。试验模拟鞋帮面向内弯折造成的破损情况,但不能较好地模拟向外弯折的破损情况。试验在湿态、干态或低温条件下进行。 5试验设备和材料 应使用以下试验设备和材料。 5.1试验机,依照ISO 5402-1:2011(4.1)包括: 5.1.1 至少四对夹具钳。上夹具钳由一对平板组成,见图1。下夹具钳固定,与上夹具钳在同一垂直面上。 单位为毫米