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    ASTM D1423/D1423M-16(2022)

    Standard Test Method for Twist in Yarns by Direct-Counting
    • 발행일 : 2022-02-01
    • 발행기관 : ASTM
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분야 07.01 : 섬유(Ⅰ)
적용범위

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 inch-pound 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.
국제분류(ICS)코드 59.080.20 : 방적사
페이지수 7
Edition 16(2022)

이력정보

No. 표준번호 표준명 발행일 상태
1 ASTM D1423/D1423M-16(2022)상세보기 Standard Test Method for Twist in Yarns by Direct-Counting 2022-02-01 표준
2 ASTM D1423/D1423M-16 REDLINE상세보기 Standard Test Method for Twist in Yarns by Direct-Counting 2016-07-01 구판
3 ASTM D1423/D1423M-16상세보기 Standard Test Method for Twist in Yarns by Direct-Counting 2016-07-01 구판

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