油漆和清漆 - 使用流动杯确定流动时间

[中文适用范围]： 本文件规定了确定油漆、清漆和相关产品流动时间的方法，可用于控制一致性。 指定了四个尺寸相似但孔径分别为 3 毫米、4 毫米、5 毫米和 6 毫米的流杯。 给出了两种检查流杯磨损情况的方法（参见附录 A）。 本文件不涵盖带有可更换喷嘴的流杯，因为未满足向喷嘴供应被测材料的严格公差。 本文件也不涵盖常用的浸流杯。 注：由于此类流杯的制造公差大于本文件中规定的流杯的制造公差，因此使用浸渍流杯测定流动时间的精度低于使用本文件中规定的流杯获得的精度（参见第 9 条） ）。 本文中描述的方法仅限于测试能够确定地确定来自流杯孔口的流动的断点的材料。 由于减速效应，对于流动时间接近测量范围上限（100 秒）的材料，这一点很难确定和重现。 [外文原描述]： This document specifies a method for determining the flow time of paints, varnishes and related products that can be used to control consistency. Four flow cups of similar dimensions, but having orifice diameters of 3 mm, 4 mm, 5 mm and 6 mm, are specified. Two methods for checking the flow cups for wear and tear are given (see Annex A). Flow cups with a replaceable jet are not covered by this document as the close tolerances on the supply of the material under test to the jet are not met. Commonly used dipping flow cups are also not covered by this document. NOTE Since the fabrication tolerances for such flow cups are greater than those of the flow cups specified in this document, flow time determinations with dipping flow cups give a precision which is lower than that obtained with the flow cups specified in this document (see Clause 9). The method described in this document is limited to testing materials for which the breakpoint of the flow from the orifice of the flow cup can be determined with certainty. This point is difficult to determine and reproduce for materials with flow times near the upper limit of the measurement range (100 s) due to slowing-down effects.