GB/T 7690.2-2013Reinforcements -- Test method for yarns -- Part 2: Determination of twist (English PDF)
增强材料 纱线试验方法 第2部分：捻度的测定
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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
Level / Type
National · Recommended
Issue date
November 27, 2013
Implementation date
August 1, 2014
Scope
GB/T 7690.2-2013 is the English-translated version of 增强材料 纱线试验方法 第2部分：捻度的测定.
GB/T 7690.2-2013 is the Chinese standard "Reinforcements -- Test method for yarns -- Part 2: Determination of twist". Its scope clause reads: GB/T 7690 provisions of this part of the glass fiber, carbon fiber, aramid fiber or other measurement method of reinforcing fiber yarn twist.
This method is suitable for yarn (a twisting), plied yarn or cable (double or multiple twisting). For plied yarns and cables, this method is usually Only applicable to the determination of the final twist.
This method is suitable for winding yarn. If the sample is a warp beam (warp) or extracted from the fabric yarns, the test results only as a state Instructions.
This method does not apply to fixed-length fiber products. Its clauses include terms and definitions.
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Document preview — GB/T 7690.2-2013
National Standard of the People's Republic of China
- ICS
- 59.100.10
- Classification
- Q 36
- Replacing
- GB/T 7690.2-2001
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
Contents
- Foreword
- 1 Scope
- 2 Normative references
- 3 Terms and Definitions
1 Scope
GB/T 7690 provisions of this part of the glass fiber, carbon fiber, aramid fiber or other measurement method of reinforcing fiber yarn twist.
This method is suitable for yarn (a twisting), plied yarn or cable (double or multiple twisting). For plied yarns and cables, this method is usually
Only applicable to the determination of the final twist.
This method is suitable for winding yarn. If the sample is a warp beam (warp) or extracted from the fabric yarns, the test results only as a state
Instructions.
This method does not apply to fixed-length fiber products.
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.
ISO 2. 1973 and its products textile yarn twist notation (Textiles-Designationofthedirectionof twistinyarnsandrelatedproducts)
ISO 291 environmental standard plastic sample conditioning and testing (Plastics-Standardatmospherefor conditioningandtesting)
ISO 1889 Determination (Reinforcementyarns-Determinationoflineardensity) reinforcing yarn linear density
3 Terms and Definitions
The following terms and definitions apply to this document.
3.1 Z twist
S twist Stwist
Vertical Hold the yarn, if the fibers or filaments around its own axis formed a spiral to the middle portion of the letter Z is the same or S
Tilted, the corresponding called Z-twist or S-twist.
NOTE. See ISO 2. 1973 Chapter 2.
Principle 4
A sample of known length of the twist can be eliminated by untwisting, one end of which is equivalent to a fixed sample fixed, the other end of the rotation until the group
A sample of all units (yarn or monofilament) in parallel.
Record yarn twist and twist, even if the number of revolutions of the yarn length 1m eliminate twist required.
We must take into account the impact of lead on the way the test results when measuring.
When the yarn is tangential leads, twist does not change. If it is the end of the lead, the twist test values according to the circumference of the spool and correction,
Increase or decrease depending on the yarn from the top or bottom of the package leads.
GB/T 9914.1 | GB/T 6006.2 | GB/T 7689.5 | GB/T 7690.6 | GB/T 7690.4 | GB/T 7690.3 | […]
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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 13 pages — is available in the English PDF.
Referenced standards
Normative references
ISO 2 · ISO 291 · ISO 1889
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Related Standards
GB/T 7690.1-2013 — Reinforcements - Test methods for yarns - Part 1: Determination of linear density
GB/T 7690.3-2013 — Reinforcements -- Test method for yarns -- Part 3: Determination of breaking force and breaking elongation for glass fibre
GB/T 7690.4-2013 — Reinforcements -- Test method for yarns -- Part 4: Determination of stiffness
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