GB/T 24121-2009 in English

《GB/T 24121-2009纺织制品 断针类残留物的检测方法》由TC209（全国纺织品标准化技术委员会）归口，TC209SC1（全国纺织品标准化技术委员会基础标准分会）执行，主管部门为中国纺织工业联合会。
本标准规定了采用金属检针机检测纺织制品中断针类或铁磁性金属残留物的方法。
本标准适用于经生产加工的纺织制品。原料、半成品和其他产品可参照使用。

1 Scope

This Standard specifies determination of the remains of broken sewing needle or ferromagnetic metal in textile products by metal needle detector.
This Standard is applicable to textile products as manufactured and processed. Raw material, semi-finished product and other products may also refer to it.

2 Principle

Induction of the remains of broken sewing needle or ferromagnetic metal will occur in textile products in the principle of electromagnetic induction, and thus being detected.

3 Detection Equipment

3.1 Detection equipment
Detection equipment with appropriate configuration form and sensitivity is selected according to detection property, type of the detected textile products as well as the requirements of relevant standards.
3.1.1 Conveyor-type metal needle detector: it is usually used either for manufacturing and processing enterprises of textile products to determine such ferromagnetic materials as iron pin and scrap iron left in textile products, or for detection organization to determine the remains of broken sewing needle or ferromagnetic metal in textile products. Common detection sensitivity (standard iron ball test card, also known as standard needle test block): 0.8mm, 1.0mm, 1.2mm, 1.5mm, 2.0mm, 2.5mm and 3.0mm.

Foreword I
1 Scope
2 Principle
3 Detection Equipment
4 Sample Preparation
5 Operation Procedures
6 Test Report
Appendix A (Normative) Calibration Method for Needle Detector