GB/T 14335-2008 in English

《GB/T 14335-2008化学纤维 短纤维线密度试验方法》由TC586（全国化学纤维标准化技术委员会）归口，主管部门为国家标准化管理委员会。
本标准代替ＧＢ／Ｔ１４３３５―１９９３《合成纤维线密度试验方法》。本标准规定了化学纤维线密度的两种试验方法，束纤维中段称量法（方法A）和单纤维振动仪法（方法B）。本标准适用于聚酯（涤纶）、聚酰胺（锦纶）、聚丙烯腈（腈纶）、聚丙烯（丙纶）、聚乙烯醇缩甲醛（维纶）、再生纤维素纤维等化学短纤维的线密度测定。丝束可参照使用。以上两种方法试验时均应对纤维施加一定的张力，使纤维伸直卷曲消失，保证测试结果的有效性。方法A和方法B的采用，根据具体条件由有关双方协商确定。 本标准与ＧＢ／Ｔ１４３３５―１９９３相比主要变化如下：
―――扩大了适用范围，由原来的合成纤维扩大到化学纤维。
―――增加了规范性引用文件，ＧＢ／Ｔ１５０００．８《标准样品工作导则（８）有证标准样品的使用》，不表述标准样品和有证标准样品的定义。
―――修改了涤纶、腈纶、丙纶纤维的调湿和试验用标准大气的相对湿度，由原来的（６５±３）％修改为（６５±５）％。
―――修改了实验室样品的调湿时间，增加了附录Ａ 快速调湿时间；
―――修改了取样量，根据２０００版ＢＩＳＦＡ 对纤维取样量的要求，由原来的１５００根～２０００根，修改为２０００根左右，增加了根据纤维的规格计算出具体的取样量。
―――增加了中段切断长度１０ｍｍ。根据纤维的长度，规定切取不同的中段长度及与中段长度相对应的计算根数。
―――增加了线密度偏差率的计算公式。
―――增加了振动法测试线密度的方法。
―――增加了附录Ｂ 振动式细度仪校验法。
―――增加了附录Ｃ 统计：术语与计算。

1 Scope

This standard specifies two testing methods for linear density of man-made fibres: bundle fibre midsection weighing method (Method A) and single fibre vibrating meter method (Method B).

This standard is applicable to the determination of linear density of man-made staple fibres made of polyester (dacron), polyamide (Nylon), polyacrylonitrile (acrylon), polypropylene (PP), polyvinyl formal (nylon) and regenerated cellulose. During the test for the aforesaid methods, a certain tension shall be applied to the fibres to straighten it and clear away the crimp, so as to guarantee the effectiveness of test results. Whether to adopt Method A or Method B shall be determined through negotiation by both parties concerned according to actual conditions.

2 Normative References

The following standard contains provisions which, through reference in this standard, constitute provisions of this standard. For dated references, subsequent amendments (excluding corrections) to, or revisions of, any of these publications do not apply. However, parties to agreements based on this standard are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below. For undated references, the latest edition of the normative document applies.

GB/T 3291.1 Textiles - Terms of Textile Material Properties and Test - Part 1: Fibre and Yarn
GB/T 6529 Textiles - Standard Atmospheres for Conditioning and Testing
GB/T 8170 Rules of Rounding-off for Numerical Values
GB/T 14334 Sampling Method for Man-made Staple Fibres
GB/T 15000.8 Directives for the Work of Reference Materials (8) - Uses of Certified Reference Materials

3 Terms and Definitions

For the purposes of this standard, the terms and definitions defined in GB/T 3291.1 and GB/T 15000.8 apply.

Foreword i
1 Scope
2 Normative References
3 Terms and Definitions
4 General Principles of Testing
5 Testing Methods
6 Testing Report
Annex A (Informative) Rapid Conditioning Time
Annex B (Informative) Calibration Method for Vibrating Fineness Meter
Annex C (Normative) Statistics: Terms and Calculation