1.1本试验方法描述了一种水平面程序，用于测定纸张在自身滑动时测得的静摩擦系数和动摩擦系数。 1.2虽然本试验方法在概念上是基本的，但精度声明已在未涂层书写和打印纸上制定。虽然建议仅对这些等级使用该测试方法，但也可以与其他类型的论文一起使用，这些论文特别关注特殊的论文特征，并且理解精度和偏差可能不同。 1.3水平仪器需要样本相对于其所在表面的某种移动方式。 摩擦系数（COF）直接从切向运动的阻力和将两张纸压在一起的施加重量来测量。 1.4静态COF与启动两个表面之间运动所需的力有关，而动态COF与导致匀速运动持续所需的力有关。 1.5试验方法D 4918中描述了斜面法 ，得出了与静态COF相似的结果，但试验方法为D 4918 不能用于测定动力学COF。方法的选择取决于可用的设备和测量手段。 1.6瓦楞纸板和实心纤维板的该特性的测定在试验方法D 4521中描述 和D 3247 . 这些试验方法的不同之处在于试验方法D 4521和D 3247 ，在确定测力之前，允许两个试样相互滑动三次，而在本试验方法中，在第一次滑动时进行测定。 1.7 本标准并非旨在解决与其使用相关的所有安全问题（如有）。本标准的用户有责任在使用前制定适当的安全和健康实践，并确定监管限制的适用性。 ====意义和用途====== 打印纸和书写纸的摩擦系数是一个指标，表明一堆纸的顶部或底部纸张在后续纸张上滑动的难易程度，例如发生在印刷机的进料或纸张输送到复印机上时。需要最小摩擦系数，以防止任何板材的双重进给。 由于每个薄板只从叠层中取出一次，因此对每对试样进行一次滑动，并记录数值。 图1两个水平面仪器的示意图

1.1 This test method describes a horizontal plane procedure for the determination of the coefficient of static and kinetic friction of paper measured when sliding against itself. 1.2 Although this test method is basic in concept, the precision statement has been developed on uncoated writing and printing papers. While the use of this test method is recommended for those grades only, it may be used with other types of papers giving specific attention to special paper characteristics and with the understanding that the precision and bias may not be the same. 1.3 The horizontal instrument requires some means of movement of the specimen in relation to the surface upon which it rests. The coefficient of friction (COF) is measured directly from the resistance to tangential motion and the applied weight pressing two pieces of paper together. 1.4 Static COF relates to the force required to initiate movement between two surfaces while kinetic COF relates to the force required to cause continuation of the movement at uniform speed. 1.5 An inclined plane method is described in Test Method D 4918 , which gives similar results for static COF but Test Method D 4918 cannot be used for the determination of kinetic COF. The choice of approach depends on the equipment available and the means of measurement. 1.6 The determination of this characteristic for corrugated and solid fiberboard is described in Test Methods D 4521 and D 3247 . These test methods differ in that in Test Methods D 4521 and D 3247 , the two specimens are allowed to slip upon one another three times before the force measurement is determined, while in this test method the determination is made on the first slip. 1.7 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. ====== Significance And Use ====== The coefficient of friction of printing and writing papers is an indicator of the ease with which the top or bottom sheet of a stack of paper will slide across the succeeding sheet, such as occurs on the infeed of a printing press or the sheet transport into a copier machine. A minimum coefficient of friction is required to prevent double-feeding of any sheets. Since each sheet is removed from the stack only once, a single slide of each pair of specimens is performed and the value recorded. FIG. 1 Schematics for Two Horizontal Plane Instruments