Use a measuring distance in accorda

Use a measuring distance in accordance with clause 4.Lay the fabric flat on a horizontal surface and place the counting glass （8.1.1）on the fabric so that one of the edges of its aperture is parallel to the warp threads.In some fabrics, it is possible to see and count every thread. If this is not possible, weave repeats may be counted. Select a thread in the weave repeat which can be identified readily and position the counting glass so that this thread is adjacent to one side of the aperture of the counting glass. Count the number of whole repeats in the measuring distance, plus the remaining individual threads. Determine the number of threads in a repeat by analysis of the weave or dissection of the fabric.Count the number of warp threads, or the number of weave repeats, or the number of warp thread units and fractions of a unit hounded by the appropriate pair of opposite sides of the aperture. Repeat with one of the edges of the apertureparallel to the weft threads, and count the number of weft threads or weave repeats yr number of weft thread units in a similar manner.If the face of the fabric is composed mainly of one set of threads, as with certain twills, sateens, etc, it may be found easier to count an the back of the fabric, where the weave design is more readily recognizable.9 Method C一Traversing thread counter9.1 Apparatus9.1.1 Traversing thread counter, incorporating a low-power microscope, of X 4 to X 2p, mounted so that it can be traversed by means of a screw over a graduated base sufficiently long to meet the minimum measuring distance requirements of clause 4. Types with an index line in the eyepiece or a pointer traversing with and visible through the microscope are equally suitable.9.2 Test procedureUse a measuring distance in accordance with clause 4.Lay the fabric flat on a horizontal surface and place the thread counter (9.1.1) upon it in such a way that when the screw is turned the microscope moves across the fabric in a direction that is either parallel to the warp or parallel to the weft, depending on which set of threads is being counted. Count the number of threads over the appropiate minimum measuring distance.In some fabrics it is possible to see and count every thread passed by the pointer or index line as it moves across the fabric. If this is not possible, weave repeats may be counted. Begin counting from a thread in the weave repeat which can be readily identified. Count the number of whole repeats in the measuring distance, plus the remaining individual threads. Determine the number of threads in a repeat by analysis of the weave or dissection of the fabric.If the face of the fabric is composed mainly of one set of threads, as with certain twills, sateens, etc., it may be found easier to count on the back of the fabric, where the weave design is more readily recognizible.10 Calculation and expression of resultsCalculato the number of threads per centimetre. Quote the mean of individual results for each direction, that for the warp threads as ends per centimetre and that far the weft as picks per centimetre. The number of threads per square centimetre is given by the sum of the mean ends and picks per centimetre.When fabrics are patterned 6y broad areas of higher or lower density of thread spacing, determine the number of threads in each area and report the number of threads per centimetre for different areas of the pattern.11 Test reportThe test report shall include the following particulars:a) a reference to this International Standard (ISO 7211/2);b) the standard atmosphere used (temperate or tropicall);c) the actual method used (A, B or C);d) the measuring distance used;e) the number of measurements made;f) the number of warp ends per centimetre and weft picks per centimotre and the mean value of warp ends per centimetre and weft picks per centimetre. If the fabric is patterned by broad areas of greater and lower density, and if required, this information can be given for each different portion of the pattern.Where the numbor of threads is low, it is permissible to express and report the results as the number of threads per decimetre. For narrow fabrics (see clause 4), report the results as the number of threads per full width;g) if required, the number of threads per square centimeter (or square decimeter);h) details of any deviation from the method.