纸浆.污物和碎片的估计.第4部分:用等值黑色面积(EBA)法以反射灯检验仪器

[中文适用范围]： ISO 5350 的这一部分规定了一种通过反射光进行仪器检查的方法，以 0.02 mm2 物理面积范围内污垢斑点的等效黑色面积 (EBA) 来评估片材制造的纸浆中的可见污垢和碎屑至 3.0 mm2。 使用 ISO 5350 本部分规定的算法，最大污垢尺寸限制为 3.0 mm2。 扩展到其他斑点尺寸（例如，物理面积大于 3.0 mm2 的斑点尺寸）可能需要更改设备、计算程序或两者，并且 ISO 5350 的本部分未涵盖。 ISO 5350 的本部分不能用于物理面积测量，因为它可能无法正确测量该测量模式的污垢斑点。 根据 ISO 3688 测定，待评估样本的亮度应为 30% 或更高。 如果表面太粗糙或有纹理，可能需要将一些纸浆片材改造成实验室片材。 ISO 5350 的这一部分也适用于再生纸浆。 [外文原描述]： ISO 5350-4:2006 specifies a method using instrumental inspection by reflected light for the estimation of visible dirt and shives in pulp manufactured in sheets, in terms of Equivalent Black Area (EBA) of dirt specks within the physical area range of 0,02 mm 2 to 3,0 mm 2 . Using the algorithm prescribed in ISO 5350-4:2006, the maximum dirt size is limited to 3,0 mm 2 . Extension to other speck sizes (for example, those greater than 3,0 mm 2 in physical area) may require changes in equipment, calculation procedures, or both, and is not covered in ISO 5350-4:2006. ISO 5350-4:2006 cannot be used for physical area measurements since it may not correctly measure the dirt specks for that mode of measurement. The specimen to be evaluated should have a brightness, as determined by ISO 3688, of 30 % or greater. It may be necessary to reform some pulp sheets into laboratory sheets, if the surface is too rough or textured. ISO 5350-4:2006 is also intended for recycled pulp.