GB/T 6839-2013Testing method for lubrication of sewing threads (English PDF)
缝纫线润滑性试验方法
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Issued by
SAMR; SAC
Level / Type
National · Recommended
Issue date
November 12, 2013
Implementation date
May 1, 2014
Scope
GB/T 6839-2013 is the English-translated version of 缝纫线润滑性试验方法.
GB/T 6839-2013 is the Chinese standard "Testing method for lubrication of sewing threads". Its scope clause reads: This standard specifies the method for measuring sewing thread with a solid metal contact dynamic friction properties.
This standard applies to linear density 10tex ~ 120tex, dynamic friction coefficient of 0.1 to 0.5 sewing thread, embroidery thread or more than norm Around the sewing thread can refer to the use of the product. Its clauses include terms and definitions.
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Document preview — GB/T 6839-2013
National Standard of the People's Republic of China
- ICS
- 59.080
- Classification
- W 58
- Replacing
- GB/T 6839-1986
Issued by: State Administration for Market Regulation; Standardization Administration of the PRC
Contents
- 1 Scope
- 2 Normative references
- 3 Terms and Definitions
- 3.1 Friction coefficient
- 3.2 Dynamic friction
- 3.3 Wind angle wrapangle
1 Scope
This standard specifies the method for measuring sewing thread with a solid metal contact dynamic friction properties.
This standard applies to linear density 10tex ~ 120tex, dynamic friction coefficient of 0.1 to 0.5 sewing thread, embroidery thread or more than norm
Around the sewing thread can refer to the use of the product.
2 Normative references
The following documents for the application of this document is essential. For dated references, only the dated version suitable for use herein
Member. For undated references, the latest edition (including any amendments) applies to this document.
GB/T 6529 Textiles Standard conditioning and testing atmosphere
3 Terms and Definitions
The following terms and definitions apply to this document.
3.1 Friction coefficient
To prevent relative movement of the two entities in the friction of two objects to force the contact surface ratio law.
3.2 Dynamic friction
The relative movement of the friction between the two surfaces.
3.3 Wind angle wrapangle
Among the yarn friction test, the test sample and cumulative exposure angle of friction between devices, in radians.
Principle 4
The sewing thread around the friction bar (winding angle alpha), the yarn in the yarn were measured input yarn tension (t1) and an output
Tension (t2), based on alpha, t1, t2 can be calculated yarn dynamic friction coefficient µ, and characterized by sewing size variation coefficient of dynamic friction and coefficient
Line lubrication is good or bad.
5 device
Means member consists of.
a) detecting means, means are.
--- Yarn tension control input;
--- The guide roller and a tension measuring head;
--- Friction rod (diameter 12.7mm, roughness of 4µm ~ 6µm chrome surface), the use of friction material rod, big […]
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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 15 pages — is available in the English PDF.
Similar standards
Editions of GB/T 6839
| Edition | Title | Revision | Status |
|---|---|---|---|
| GB/T 6839-2013 | Testing method for lubrication of sewing threads | current edition | Current |
| GB/T 6839-1986 | Testing method for lubrication of sewing threads | previous edition | Superseded |
This page sells the current edition, GB/T 6839-2013. Earlier editions are listed for reference only.
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