ASTM D1423/D1423M-16(2022)
Standard Test Method for Twist in Yarns by Direct-Counting

Standard No.
ASTM D1423/D1423M-16(2022)
Release Date
2022
Published By
American Society for Testing and Materials (ASTM)
Latest
ASTM D1423/D1423M-16(2022)
Scope
1.1 This test method covers the determination of the amount and direction of twist at the completion of any stage of twisting in single (spun or filament), plied, cabled, or novelty (exclusive of long-term repeat patterns) yarns. The procedures are designed primarily for yarns in packages, but, with special precautions, they are applicable to yarns taken from fabrics. The procedure for spun yarn in 9.2 is also applicable to rovings. 1.2 For plied yarns, this test method covers the determination of the twist of the plied yarns and the twist of the single yarn before plying. For cabled yarns, the test method covers the determination of the cable or hawser twist; the twist of the plied yarn after plying, but prior to the last twisting operation; and the twist of the single yarn before plying. Procedures are also included for the determination of the twists of the single and plied yarn components as they lie in the final structure. Also, directions are included for the determination of twist in plied yarn made with direct cabling technology. 1.3 This test method is not intended for yarns that extend more than 5.0 % when tension is increased from 2.5 to 7.5 mN/tex [0.25 to 0.75 gf/tex]. Following the procedures of this test method for such yarns would be independent of the bias and precision determined for this test method. The report from such testing should include the tension used for this testing. 1.4 Units—The values stated in either SI units or inchpound units are to be regarded separately as standard. The values stated in each system are not necessarily exact equivalents; therefore, to ensure conformance with the standard, each system shall be used independently of the other, and values from the two systems shall not be combined. NOTE 1—For a more rapid but less accurate method of determining twist in single spun yarns, refer to Test Method D1422. NOTE 2—This test method has been evaluated for use in determining twist in open end yarns and is not recommended. 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use. 1.6 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

ASTM D1423/D1423M-16(2022) Referenced Document

  • ASTM D1059 Standard Test Method for Yarn Number Based on Short-Length Specimens
  • ASTM D123 Standard Terminology Relating to Textiles*， 2023-09-14 Update
  • ASTM D1422 Standard Test Method for Twist in Single Spun Yarns by the Untwist-Retwist Method
  • ASTM D1776 Standard Practice for Conditioning and Testing Textiles
  • ASTM D1907 Standard Test Method for Linear Density of Yarn (Yarn Number) by the Skein Method
  • ASTM D3888 Standard Terminology Relating to Open-End Spinning
  • ASTM D4849 Standard Terminology Related to Yarns and Fibers

ASTM D1423/D1423M-16(2022) history

Standard Test Method for Twist in Yarns by Direct-Counting


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