9.5.1 Cut each specimen 50士lmm(2士0.02 in.) wide by at least 150 mm (6 in.) long with the long dimension accurately parallel to the direction for which the breaking force is required (Notes 8 and 9). 9.6 When the breaking force of wet fabric is required in addition to that of conditioned fabric, cut one set of specimens with each test specimen twice the normal length (Note 10).Number each specimen at both ends and then cut the specimens, in half cross-wise, to provide one set for determining the conditioned breaking force, and another set for determining the wet breaking force. This allows for breaks on paired specimens which leads to more direct comparison of condiboned vs. wet breaking force because both specimens of a pair contain the same test yarns (nonwoven fabric channel and cross direction areas). NOTE 10-For fabrics which shrink excessively when wet, it will benecessary to cut the test specimens to allow for longer wet breaking force specimens than conditioned breaking force specimens.10. Preparation, Calibration, and Verification of Apparatus 10.1 Tensile Testing Machine: 10.1.1 Prepare the testing machine according to the manufacturer's instructions and using the conditions given in 10.1.2一10.2.4 (see Annex A1). 10.1.2 Set the distance between the clamps (gage length) at 75士1 mm (3士0.05 in). 10.1.3 Select the force range of the testing machine for the break to occur between 10 and 90%of full scale force.Calibrate or verify the testing machine for this range. 10.1.4 Set the testing machine for a loading rate of 300士10 mm/min (12士0.5 in./min) unless otherwise specified. 10.2 Clamping匆stem: 10.2.1 Check the jaw face surfaces for flatness and parallelism. 10.2.2 Make a four-ply sandwich of white tissue paper, two soft carbon papers placed back-to-back and a second white paper (or fold the first white paper over the two carbons). 10.2.3 Mount the paper-carbon sandwich in the clamps with normal pressure. 10.2.4 Remove the paper-carbon sandwich and examine the jaw face imprint for uniformity of carbon deposition on the tissue paper. 10.2.5 If the imprint is incomplete or off-size, make appropriate adjustments of the clamp gripping system and recheck the clamping system with the paper-carbon sandwich. NOTE 11-Some sources of clamping irregularities are surface contact,metal surface, or jaw coating-cover surface, condition, and pressureapplication. 10.3 Verification of the Total Operating System of the Apparatus: 10.3.1 Verify the total operating system (loading, extension,clamping, and recording or data collecting) by testing speci-mens of standard fabrics for breaking force and elongation by the type of strip test to be used and comparing the data with that given for the standard fabrics. Verification of the system on at least a weekly basis is recommended. In addition, the total
9.5.1 Cut each specimen 50士lmm(2士0.02 in.) wide by at least 150 mm (6 in.) long with the long dimension accurately parallel to the direction for which the breaking force is required (Notes 8 and 9).<br> 9.6 When the breaking force of wet fabric is required in addition to that of conditioned fabric, cut one set of specimens with each test specimen twice the normal length (Note 10).<br>Number each specimen at both ends and then cut the specimens, in half cross-wise, to provide one set for determining the conditioned breaking force, and another set for determining the wet breaking force. This allows for breaks on paired specimens which leads to more direct comparison of condiboned vs. wet breaking force because both specimens of a pair contain the same test yarns (nonwoven fabric channel and cross direction areas).<br> NOTE 10-For fabrics which shrink excessively when wet, it will be<br>necessary to cut the test specimens to allow for longer wet breaking force specimens than conditioned breaking force specimens.<br>10. Preparation, Calibration, and Verification of Apparatus<br> 10.1 Tensile Testing Machine:<br> 10.1.1 Prepare the testing machine according to the manufacturer's instructions and using the conditions given in 10.1.2一10.2.4 (see Annex A1).<br> 10.1.2 Set the distance between the clamps (gage length) at 75士1 mm (3士0.05 in).<br> 10.1.3 Select the force range of the testing machine for the break to occur between 10 and 90%of full scale force.<br>Calibrate or verify the testing machine for this range.<br> 10.1.4 Set the testing machine for a loading rate of 300士10 mm/min (12士0.5 in./min) unless otherwise specified.<br> 10.2 Clamping匆stem:<br> 10.2.1 Check the jaw face surfaces for flatness and parallelism.<br> 10.2.2 Make a four-ply sandwich of white tissue paper, two soft carbon papers placed back-to-back and a second white paper (or fold the first white paper over the two carbons).<br> 10.2.3 Mount the paper-carbon sandwich in the clamps with normal pressure.<br> 10.2.4 Remove the paper-carbon sandwich and examine the jaw face imprint for uniformity of carbon deposition on the tissue paper.<br> 10.2.5 If the imprint is incomplete or off-size, make appropriate adjustments of the clamp gripping system and recheck the clamping system with the paper-carbon sandwich.<br> NOTE 11-Some sources of clamping irregularities are surface contact,<br>metal surface, or jaw coating-cover surface, condition, and pressure<br>application.<br> 10.3 Verification of the Total Operating System of the Apparatus:<br> 10.3.1 Verify the total operating system (loading, extension,clamping, and recording or data collecting) by testing speci-<br>mens of standard fabrics for breaking force and elongation by the type of strip test to be used and comparing the data with that given for the standard fabrics. Verification of the system on at least a weekly basis is recommended. In addition, the total
正在翻译中..