Historical Standard: ASTM D1425/D1425M-09 Standard Test Method for Unevenness of Textile Strands Using Capacitance Testing Equipment
SUPERSEDED (see Active link, below)
ASTM D1425 / D1425M
1.1 This test method covers the indirect measurement of evenness (mass variation) of non-conductive textile strands, including top, comber lap, sliver, roving, and yarn produced from staple fibers and continuous filament yarns, by means of capacitance testing equipment.
1.2 Strands made from fiber blends can be tested using this test method only if the different fibers are uniformly distributed throughout the strand.
1.3 The test method provides numeric values for the measurement and evaluation of short-, mid-, and long-term mass variations of the tested strand in terms of frequently occurring faults classified as thin places, thick places, and neps and graphical representations of evenness values in the form of diagram charts, spectrograms, length variation curves, and histograms.
1.4 The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in non-conformance with the standard.
1.5 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.
2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.
D123 Terminology Relating to Textiles
D1776 Practice for Conditioning and Testing Textiles
D2258 Practice for Sampling Yarn for Testing
D4849 Terminology Related to Yarns and Fibers
strand; textile; unevenness; yarn ; Unevenness; Wool and wool top; Yarn properties; Capacitance; Filament yarn; Knitted textile fabrics; Roving; Sliver; Staple fibers; Textile strands; Tow
ICS Number Code 59.080.50 (Ropes)