FZ/T 12010-2024 in English
VALIDCotton covered spandex grey yarns
- Issued on:2024-07-05
- Implemented on:2026-07-01
- File Format:PDF
- Delivery:Via email within 1~3 business days
$223.00
| Standard No: | FZ/T 12010-2024 |
| Document status: | VALID |
| Title in English: | Cotton covered spandex grey yarns |
| Title in Chinese: | 棉氨纶包芯本色纱 |
| Language: | English |
| File Format: | Electronic (PDF) |
| Delivery: | Via email within 1~3 business days |
| Issued on: | 2024-07-05 |
| Implemented on: | 2026-07-01 |
| ICS Classification: | 59.080.20-Yarns |
| Chinese Classification: | W12-Cotton yarns and threads |
| Professional Classification: | FZ-Textile |
| Related Keywords: | spandex grey
instrument detection yarn defect control appearance quality yarn defect yarn defect limits core quality indicators |
Introduction
Core changes in the standard revision
| Revision dimensions | Requirements of the 2011 version | Changes in the 2024 version | Technical impact |
|---|---|---|---|
| Quality indicators | Assessment of 9 indicators including blackboard evenness | Increased to 11 indicators, blackboard assessment deleted | More emphasis on the objectivity of instrument detection |
| Yarn defect control | Appearance quality is not specified | Added 3 types of yarn defect limits (hollow core/poor coating/exposed core) | Improve the wearability of elastic yarn |
| Testing methods | Uniform sampling regulations | Independent implementation of each method | Enhance the coordination of standards |
Analysis of key technical requirements
1. Yarn classification system
The standard clearly classifies yarns into three dimensions: production process (combed/combed), blending ratio (3%-20% spandex) and linear density. Marking example: JC/Pu93/7 13.0tex(44.4dtex) means combed cotton covered with 44.4 denier spandex, with a cotton-spandex mass ratio of 93:7.
2. Comparison of core quality indicators
Taking 13.1-16.0tex carded yarn as an example, the requirements for superior products are:
- Linear density variation coefficient ≤2.0% (2011 version is 2.5%)
- Single yarn breaking strength ≥14.0cN/tex (increased by 0.5cN/tex)
- 15 yarn defects per 100,000 meters (new indicator)
Implementation suggestions
1. Key points of process control
The pre-draft ratio of spandex is recommended to be controlled at 3.5-4.0 times, and the coated cotton fiber needs to ensure class=instrument>twist coefficient is within the range of 360-400 to prevent the occurrence of hollow yarn defects (core yarn breakage) and exposed yarn defects (incomplete covering) defined in the standard.
2. Detection optimization plan
Recommended configuration: capacitive yarn evenness meter (GB/T 3292.1) + automatic yarn defect grader (FZ/T 01050). Note that the yarn tension should be selected according to the shaping situation (1.2±0.2) cN/tex or (0.5±0.1) cN/tex.
3. Quality traceability improvement
Establish a yarn defect atlas library, and archive images of poor covering points within a length of 3000m, which meets the judgment rule of ≤30cm/point required by Appendix B.
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