GB/T 3903.1-2017 (GB/T3903.1-2017, GBT 3903.1-2017, GBT3903.1-2017) & related versions
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GB/T 3903.1-2017
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 61.060
Y 78
Replacing GB/T 3903.1-2008
Footwear -- Test methods for whole shoe --
Flexing resistance
ISSUED ON. DECEMBER 29, 2017
IMPLEMENTED ON. JULY 1, 2018
Issued by. General Administration of Quality Supervision, Inspection and
Quarantine of the People’s Republic of China;
Standardization Administration of the People’s Republic of
China.
Table of Contents
Foreword . 3
1 Scope .. 4
2 Normative references . 4
3 Principle.. 4
4 Apparatus . 5
5 Test piece . 6
6 Test conditions . 6
7 Test procedures . 7
8 Test results .. 8
9 Test report . 8
Foreword
This Standard was drafted in accordance with the rules given in GB/T 1.1-2009.
This Standard supersedes GB/T 3903.1-2008 Footwear -- General test
methods -- Flexing resistance. Compared with GB/T 3903.1-2008, the main
technical differences are as follows.
— MODIFY the standard name;
— MODIFY the scope of application of the standard;
— MODIFY the description of the standard principle;
— MODIFY the number of samples;
— ADD the requirements for holders in the flexing resistance testers;
— MODIFY the test procedures;
— MODIFY the description of the test results.
Attention is drawn to the possibility that some of the elements of this document
may be the subject of patent rights. The issuing authority shall not be held
responsible for identifying any or all such patent rights.
This Standard was proposed by the China National Light Industry Council.
This Standard shall be under the jurisdiction of National Technical Committee
for Standardization of Shoemaking (SAC/TC 305).
Drafting organizations of this Standard. China Leather and Footwear Industry
Research Institute, Anta (China) Co., Ltd, Dezhou Xinhuarun Technology Co.,
Ltd, China Leather and Footwear Industry Research Institute (Jinjiang) Co., Ltd,
Guangdong Wanlima Industry Co., Ltd.
Main drafters of this Standard. Qin Xiaobo, Li Su, Li Yucai, Shi Yiwei, Shen
Yimin, Ye Yahong.
The previous released editions of this Standard are as follows.
— GB 3904-1983.
— GB/T 3903.1-1994, GB/T 3903.1-2008.
Footwear -- Test methods for whole shoe --
Flexing resistance
1 Scope
This Standard specifies the test methods for flexing resistance of whole shoes
or soles.
This Standard is applicable to whole shoes and soles.
This Standard is not applicable to the whole shoes or soles with a height greater
than 70mm, or a thickness of the sole flexion site greater than 25mm, or a
bending angle less than 45° after rigidity is tested according to the provisions
of 8.4.1 in GB/T 20991-2007.
NOTE 1. The thickness of the sole flexion site includes the thickness of the insole.
NOTE 2. The sole material (sheet) can be determined with reference to this Standard.
2 Normative references
The following documents are essential to the application of this document. For
dated references, only the editions with the dates indicated are applicable to
this document. For undated references, only the latest editions (including all the
amendments) are applicable to this document.
GB/T 20991-2007 Personal protective equipment -- Test methods for
footwear
GB/T 22049 Footwear -- Standard atmospheres for conditioning and testing
of footwear and components for footwear
3 Principle
After a whole shoe or sole is conducted with the flexing test on a flexing
resistance tester at a certain flexing angle and frequency, OBSERVE the
changes in upper, sole, and upper-sole bonding site.
7 Test procedures
7.1 Before the test, in accordance with the provisions of GB/T 22049, the test
pieces shall be placed at a standard ambient temperature of (23 ± 2) °C for at
least 4h.
7.2 CHECK the test pieces. If there are any impurities on the surface, USE
gauze moistened with alcohol to wipe them clean.
7.3 Each test piece is equipped with a fitting flexible test last (4.2). Under
normal circumstances, the last size should be 5mm less than the footwear size,
so that the vamp is not tight.
EXAMPLE. If the footwear size of the test piece is 240, a flexible test last with a last size of 235 should
be selected.
7.4 BEND the test pieces. MARK the position of metatarsophalangeal flexion
on both sides of the shoe. CONNECT these two positions to draw a flex line on
the sole.
7.5 CLAMP the test pieces in the holder of the flexing resistance tester (4.1).
The flex line on the sole, the steel shaft of the flexible test last, and the axis of
the holder’s movable shaft shall be at the same level.
7.6 PLACE the tester at the minimum flexing angle. ADJUST the tilt angle of
the holder. OBSERVE the position of the heel so that the test piece is in a
natural state without being bent in any direction.
7.7 ADJUST the eccentricity of the tester so that the flexing angle reaches the
specified angle (6.1).
7.8 If cutting is required, SLICE a 5mm long cut in the middle of the flex line
on the sole. In addition, CUT through the sole.
7.9 RESET the counter of the tester. PRESET the number of flexing to 40,000
times (in case of other requirements in the product standards, it shall be
implemented according to the product standards). ACTIVATE the blower. Then
TURN on the main unit.
7.10 During the operation of the tester, OBSERVE the clamping condition of
the test pieces. If there is looseness or a change in flexion position, the device
shall be shut down in time for adjustment.
7.11 After shutdown as per preset number of times, BEND the flexing
resistance tester to the maximum flexing angle. USE a Vernier caliper (4.3) to
measure the length and number of new cracks. In case of cutting, it is also
necessary to measure the extended length of the cut on the sole.
......
GB/T 3903.1-2008
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 61.060
Y 78
Replacing GB/T 3903.1-1994
Footwear - General test methods - Flexing resistance
Replaced by GB/T 3903.1-2017
ISSUED ON: DECEMBER 30, 2008
IMPLEMENTED ON: SEPTEMBER 01, 2009
Issued by: General Administration of Quality Supervision, Inspection and
Quarantine of the People’s Republic of China;
Standardization Administration of the People’s Republic of
China.
Table of Contents
Foreword ... 3
1 Scope ... 4
2 Normative references ... 4
3 Instruments and equipment... 4
4 Sampling and conditioning ... 5
5 Test method ... 5
6 Test result ... 7
7 Test report ... 7
Footwear - General test methods - Flexing resistance
1 Scope
This Standard specifies the test method for flexing resistance of whole shoes
or soles.
This Standard applies to whole shoes, sole products or materials (sheets).
2 Normative references
The terms in the following documents become the terms of this Part by
reference to this Part of GB/T 3903. For dated references, all subsequent
amendments (not including errata content) or revisions do not apply to this Part.
However, parties to agreements that are based on this Part are encouraged to
study whether the latest versions of these documents can be used. For undated
references, the latest edition applies to this Part.
GB/T 22049, Footwear - Standard atmospheres for conditioning and testing
of footwear and components for footwear (GB/T 22049-2008, ISO
18454:2001, IDT)
3 Instruments and equipment
3.1 Flexing resistance tester
3.1.1 The flexing angle is adjustable from 0 °C to 55 °C.
3.1.2 The flexing frequency is adjustable within the range of 100 times/min to
300 times/min.
3.1.3 It is able to automatically shut down according to the preset number of
flexing.
3.1.4 A device is provided for blasting the flexure of the test piece.
3.2 Flexible test last
3.2.1 A steel shaft in size of ϕ 5.5 mm × 40 mm is fitted on the vertical line from
the first metatarsophalangeal site to the axis of last bottom of the flexible test
last. There is no bump on the surface of the steel shaft relative to the last bottom.
Use a cutting knife (3.4) to cut the whole shoes or soles with a slit of a specified
length; perform a flexion test on a flexing resistance tester at a certain angle
and frequency; then, measure the expanded length of the slit on the sole;
observe the changes in the upper surface, shoe sole, and upper sole (including
strips, bottom wall) bonding site at the same time.
Note: The whole shoe or sole can be directly subjected to the flexion test without cutting.
Whether cutting or not shall be determined according to the requirements of the
relevant product standards.
5.2 Test conditions
5.2.1 The flexing angle of the flexing resistance tester is (50 ± 1) ° (in case of
special requirements, it can be selected between 0° and 55°).
5.2.2 The flexing frequency of the flexing resistance tester is (230 ± 10) times /
min (in case of special requirements, it can be selected within the range of 100
times / min to 300 times / min).
5.3 Test procedure
5.3.1 Check the test pieces. If there are any impurities on the surface, use
gauze moistened with alcohol to wipe them clean.
5.3.2 Each test piece is equipped with a fitting flexible test last (3.2). Under
normal circumstances, the last size shall be 5 mm less than the footwear size
5.3.3 Clamp the test piece in the holder of the flexing resistance tester (3.1).
The flexion part of the metatarsophalangeal site of the sole surface coincides
with the axis of the movable axis of the holder (if cut, the cut part shall be on
this axis).
5.3.4 Adjust the eccentricity of the tester, so that the flexing angle reaches the
specified angle (5.2.1).
5.3.5 Bend the flexing resistance tester to the minimum flexing angle; observe
the position of the heel of the shoe; leave the sample in a natural state without
bending in any direction; otherwise, adjust the tilt angle of the holder, so that it
is in a natural state before adjusting the flexing angle.
5.3.6 Bend the flexing resistance tester to the maximum flexing angle; divide a
5 mm long incision in the middle part of the metatarsophalangeal flexing part of
the sole surface; cut the sole through.
5.3.7 Clear the counter of the tester; preset the number of flexing and flexing
frequency to the specified value; turn on the host after activating the blower.
5.3.8 During the operation of the tester, observe the clamping condition of the
test pieces. If there is looseness or a change in flexion position, the device shall
be shut down in time for adjustment.
5.3.9 After shutdown as per preset number of times, use a vernier caliper (3.3)
to measure, and visually inspect the change of the test piece.
5.3.9.1 Put the tester in the state of maximum flexion angle; measure the length
of the shoe sole cut after expansion, as well as the length and number of newly
generated cracks.
5.3.9.2 Remove the test pieces from the holder. Leave them in natural state;
observe the changes in upper, sole, and upper-sole (including strips, bottom
wall) bonding site.
6 Test result
6.1 The extended length of the sole cut, the length of the newly generated crack,
and the opening length of the joint of the upper sole (including the strip and the
bottom wall), in millimeters; the effective digit is to one decimal place.
6.2 The changes in the upper surface (such as cracking, cracked surface), shoe
sole (such as newly generated cracks, paint cracking or falling off), upper sole
(including strips, bottom wall) bonding site (such as adhesive failure) are
explained in words.
6.3 The test results of each shoe (sole) are indicated separately.
7 Test report
The test report shall contain the following contents:
a) number of this Part of GB/T 3903;
b) detailed description of the test pieces, including sample number, name,
specification, quantity, material;
c) test results, implemented in accordance with Chapter 6;
d) description of the test part and its surface treatment method;
e) environmental conditions and time for environmental conditioning and
testing of the test pieces;
f) test personnel and test date;
......
| Standard ID | GB/T 3903.1-2017 (GB/T3903.1-2017) | | Description (Translated English) | Footwear -- Test methods for whole shoe -- Flexing resistance | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | Y78 | | Classification of International Standard | 61.060 | | Word Count Estimation | 6,693 | | Date of Issue | 2017-12-29 | | Date of Implementation | 2018-07-01 | | Drafting Organization | China Leather and Footwear Industry Research Institute, Anta (China) Co., Ltd., Dezhou Xinhuarun Technology Co., Ltd., China Leather and Footwear Industry Research Institute (Jinjiang) Co., Ltd., Guangdong Wanlima Industrial Co., Ltd. | | Administrative Organization | National Standardization Technical Committee for Footwear (SAC/TC 305) | | Proposing organization | China National Light Industry Federation | | Issuing agency(ies) | General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China, Standardization Administration of China | | Standard ID | GB/T 3903.1-2008 (GB/T3903.1-2008) | | Description (Translated English) | Footwear. General test methods. Flexing resistance | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | Y78 | | Classification of International Standard | 61.060 | | Word Count Estimation | 6,688 | | Date of Issue | 2008-12-30 | | Date of Implementation | 2009-09-01 | | Older Standard (superseded by this standard) | GB/T 3903.1-1994 | | Quoted Standard | GB/T 22049 | | Drafting Organization | China Leather and Footwear Industry Research Institute | | Administrative Organization | National Standardization Technical Committee footwear | | Regulation (derived from) | National Standard Approval Announcement 2008 No.24 (Total No.137) | | Proposing organization | China Light Industry Federation | | Issuing agency(ies) | Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China; Standardization Administration of China | | Summary | This standard specifies test methods into the soles of shoes or folding properties. This standard applies to shoes, sole product or material (sheet). | | Standard ID | GB/T 3903.1-1994 (GB/T3903.1-1994) | | Description (Translated English) | General test method for footwear-Test method of flexing resistance | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | Y75 | | Classification of International Standard | 61.06 | | Word Count Estimation | 5,592 | | Date of Issue | 1994/11/17 | | Date of Implementation | 1995/8/1 | | Older Standard (superseded by this standard) | GB 3904-1983 | | Regulation (derived from) | Announcement of Newly Approved National Standards No. 24 of 2008 (No. 137 overall) | | Proposing organization | China Light Industry Association | | Issuing agency(ies) | State Bureau of Technical Supervision |
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