纺织玻璃纤维 纱线 断裂强力和断裂伸长的测定

[中文适用范围]： 本国际标准规定了从卷装中取出的玻璃丝的拉伸断裂力和断裂伸长率的测定方法。 2 本方法适用于各种类型的玻璃纱（单纱、折叠纱、绞纱、原丝、无捻结构、无捻粗纱等）。 它基本上适用于从卷装中取出的直径小于 2 毫米或线密度低于 2000 特克斯的单纱、折叠纱和缆状玻璃纱。 如果所有相关方都可以接受测试条件，则也可以测试较重的纱线。 3 本方法不适用于在标准大气平衡和 5 mN/tex 预张力下伸长超过 0.5% 的玻璃纱。 此类纱线可以使用所有感兴趣的各方都可接受的较低预张力（例如2.5 mN/tex 或1 mN/tex）进行测试。 这主要发生在处理短纤维纱线时。 注 1：尽管可以对经轴纱线或取自织物的纱线进行测定，但结果必须仅视为指示性的。 注 2：该测试方法主要用于材料表征和质量控制。 纤维间的磨损和其他因素，例如张力不够均匀（悬链线），会增加变异性并产生较低的测试值。 这将最终阻碍纱线性能和最终用途之间的准确关联。 出于规范目的考虑此方法时应格外小心。 注 3：虽然本国际标准提供了测定断裂伸长率的可能性，但不推荐这种做法。 事实上，只有使用引伸计才能正确评估伸长率；它不能通过测量移动夹具移动的距离来获得。 另一方面，经验表明，引伸计的使用相当精密，常常会对样品造成损坏。 [外文原描述]： 1.1 This International Standard specifies a method for the determination of the tensile breaking force and elongation at break of glass yarns taken from packages. 1.2 The method is applicable to various types of glass yarn (single, folded, cabled, strands, structures without twist, rovings, etc.). It is basically intended for single, folded and cabled glass yarns having a diameter of less than 2mm, or a linear density lower than 2000 tex , taken from packages. Heavier yarns may be also tested providing the test conditions are acceptable to all interested parties. 1.3 The method is not applicable to glass yarns which, in equilibrium with the standard atmosphere and under a pre-tension of 5 mN/tex , are elongated by more than 0,5% . Such yarns can be tested using a lower pre-tension (for example 2,5 mN/tex or 1 mN/tex ), acceptable to all interested parties. This would occur mainly when dealing with staple- fibre yarns. NOTE 1 Though the determination may be run on beamed yarn or on yarns taken from fabrics, the results must be considered as indicative only. NOTE 2 This test method is primarily intended for material characterization and quality control. Fibre-to-fibre abrasion and other factors such as insufficiently uniform tension (catenary) will increase variability and generate low test values. This will consequently impede accurate correlation between performance of the yarns and end use applications. Extreme care should be taken in considering this method for specification purposes. NOTE 3 Though this International Standard provides the possibility of determining the elongation at break, this practice is not recommended, however. Indeed, a correct assessment of the elongation will only be obtained using an extensometer; it will not be obtained by measuring the distance traversed by the moving clamp. On the other hand, experience shows that the use of an extensometer is quite delicate and often causes damage to the specimen.