QB/T 4839-2023Upholstered furniture - Form mattress (English PDF)
软体家具 发泡型床垫
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Issued by
Ministry of Industry and Information Technology of PRC
Level / Type
National · Recommended
Issue date
May 8, 2018
Implementation date
September 1, 2018
Scope
QB/T 4839-2023 is the English-translated version of 软体家具 发泡型床垫.
QB/T 4839-2023 — This standard specifies the principle, device, test method, test report of the dynamic folding test of leather belt products. This standard is applicable to belt products such as waist belts, shoulder straps, soft handles for luggage.
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Document preview — QB/T 4839-2023
National Standard of the People's Republic of China
- ICS
- 59.140.35
Issued by: Ministry of Industry and Information Technology of PRC
Contents
- Foreword...3
- 1 Scope...4
- 2 Principle...4
- 3 Device...4
- 4 Preparation of specimens...5
- 5 Test method...5
- 6 Test report...6
Foreword
This standard was drafted in accordance with the rules given in GB/T 1.1-2009.
This standard was proposed by the China Light Industry Federation.
This standard shall be under the jurisdiction of the National Technical Committee for
Standardization of Leather Industry (SAC/TC 252).
Drafting organizations of this standard. Dongguan Hengyu Instrument Co., Ltd.,
National Leather Products Quality Supervision and Inspection Center (Guangzhou),
Guangdong Huizhou Quality Metrology Supervision and Inspection Institute, China
Leather and Footwear Industry Research Institute, Guangzhou Quality Supervision and
Inspection Institute, Zhejiang Zhishang Industrial Co., Ltd. Guangzhou Branch.
1 Scope
This standard specifies the principle, device, test method, test report of the dynamic
folding test of leather belt products.
This standard is applicable to belt products such as waist belts, shoulder straps, soft
handles for luggage.
2 Principle
According to the bending force of the specimen, select the appropriate initial distance
and weight, to perform reciprocating folding motion at a certain frequency, to test the
quality of waist belts, shoulder straps, soft handles and other belt products.
3 Device
3.1 Dynamic folding test machine
It shall include the components specified in 3.1.1 ~ 3.1.5; the schematic diagram is
shown in Figure 1.
3.1.1 The specimen fixing device consists of a pair of specimen clamps, one of which
can move in the left and right direction, whilst the other specimen clamp can move in
the front and back direction. The initial positions of the two specimen clamps are in a
straight line.
3.1.2 The weight loading device is connected to the specimen clamp that moves left and
right; it can load the weight as needed. When the weight is not loaded, the specimen
clamp is not subjected to force and can move freely left and right.
3.1.3 The driving device is connected to the specimen clamp that moves forward and
backward; drives the specimen clamp to make a reciprocating motion with a stroke of
(55 ± 3) mm and adjustable frequency, so that the two specimen clamps make a
reciprocating folding motion perpendicular to the specimen installation direction.
3.1.4 The counter records the number of folding times.
3.1.5 The control device has an automatic shutdown function when the specimen is
abnormal during the test; automatically records the number of folding times at this time.
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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 6 pages — is available in the English PDF.
Referenced standards
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