QB/T 2224-2012 PDF English
US$115.00 · In stock · Download in 9 secondsQB/T 2224-2012: Footwear. Performance requirement for uppers low-temperature flexing resistance Delivery: 9 seconds. True-PDF full-copy in English & invoice will be downloaded + auto-delivered via email. See step-by-step procedureStatus: Valid QB/T 2224: Evolution and historical versions
| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivery | Name of Chinese Standard | Status |
| QB/T 2224-2012 | English | 115 |
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Footwear. Performance requirement for uppers low-temperature flexing resistance
| Valid |
| QB/T 2224-1996 | English | 199 |
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2 days
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Technical Conditions on Flexibility at Low Temperature of Upper Materials
| Obsolete |
Excerpted PDFs (Download full copy in 9 seconds upon purchase)PDF Preview: QB/T 2224-2012
QB/T 2224-2012: Footwear. Performance requirement for uppers low-temperature flexing resistance---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/QBT2224-2012
QB
LIGHT INDUSTRY STANDARD OF
THE PEOPLE’S REPUBLIC OF CHINA
ICS 61.060
Classification No.. Y78
Record No.. 36727-2012
Replacing QB/T 2224-1996
Footwear - Performance Requirement for Uppers Low-
Temperature Flexing Resistance
Issued on: MAY 24, 2012
Implemented on: NOVEMBER 1, 2012
Issued by. Ministry of Industry and Information Technology of the People’s
Republic of China
Table of Contents
Foreword... 3
1 Scope... 4
2 Normative References... 4
3 Terms and Definitions... 4
4 Requirements... 4
5 Cold Resistance Tester... 5
6 Sampling and Environmental Conditioning... 5
7 Test Procedures... 5
8 Inspection Rules... 6
9 Judgement... 6
Footwear - Performance Requirement for Uppers Low-
Temperature Flexing Resistance
1 Scope
This Standard specifies the performance requirements, test methods, and inspection rules for
the low-temperature flexing resistance of footwear uppers.
This Standard applies to various upper materials.
2 Normative References
The following documents are essential to the application of 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.
GB/T 2703 Footwear - Vocabulary
GB/T 22049 Footwear - Standard atmospheres for conditioning and testing of footwear
and components for footwear
QB/T 1187 Footwear - Principle of Inspection and Marking, Package, Transportation, and
Storage
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 Flexing resistance at low temperature
The upper material's resistance to repeated flexing under low temperature conditions.
4 Requirements
Conduct a flexing resistance test on upper materials at a temperature of (-10±2) °C, requiring
superior products to be flexed for no less than 60,000 times, and qualified products to be flexed
for no less than 30,000 times. When various material components reach the specified flexing
times, no visually observable cracks or ruptures (including pulp or surface cracks) shall appear
on the specimens.
5 Cold Resistance Tester
5.1 The temperature control in the refrigeration chamber shall meet (-10±2) °C with an accuracy
of 1.0°C.
5.2 The V-shaped clamps in the refrigeration chamber shall meet the following conditions.
5.2.1 The axes of each pair of clamps shall be collinear.
5.2.2 The clamps shall be installed in the refrigeration chamber (5.1) with an adjustable bending
angle from 0° ~ 90°, with an error of ±2°.
5.2.3 Each pair of clamps shall consist of a fixed clamp and a movable clamp. When the cold
resistance tester is in operation, the movable clamp reciprocates, causing the distance between
the two clamps to repeatedly change, thereby repeatedly flexing the specimen.
5.2.4 When the two clamps are moving apart, they shall be (28.5±1.0) mm apart; and when they
are moving closely, they shall be (9.5±1.5) mm apart, resulting in a stroke of (19.0±2.5) mm.
6 Sampling and Environmental Conditioning
6.1 Number of specimens. When sampling, there shall be no fewer than 4 specimens (2 in the
horizontal and 2 in vertical directions); the specimen is 70 mm long and 65 mm wide.
6.2 Specimens must not exhibit defects such as scratches, impurities, stains, or abrasions.
6.3 Specimen thickness must be the original material thickness. Specimens with a thickness of
no more than 2.5 mm are recommended for testing.
7 Test Procedures
7.1 Adjust the clamps to the extended position and securely clamp the test pieces in the clamps.
Position the test pieces symmetrically with the outer layer facing outward, with the length of
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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