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ASTM D5647-07

Current Revision

Standard Guide for Measuring Hairiness of Yarns by the Photo-Electric Apparatus

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1.1 This guide covers the determination of the hairiness of most filament and spun yarn using a photo-electric sensor apparatus. It is not intended for use on novelty yarns.

1.2 This guide shows the values in SI units. "SI units" is the technically correct name for a system of metric units known as the International System of Units.

1.3 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.


The photo-electric method for measuring the hairiness of yarns is not recommended for acceptance testing of commercial shipments since experience has shown that results obtained from machines produced by one manufacturer cannot usually be verified by machines produced by another manufacturer. This guide is intended to increase the awareness of the user to available techniques for measuring hairiness. In some cases the purchaser and the supplier may have to test a commercial shipment of one or more specific materials by the best available guide though it has not been recommended for acceptance testing of commercial shipments.

5.1.1 If there are differences of practical significance between reported test results for two laboratories (or more), comparative tests should be performed to determine if there is a statistical bias between them, using competent statistical assistance. As a minimum, test samples that are as homogenous as possible, drawn from the material from which the disparate test results were obtained, and randomly assigned in equal numbers to each laboratory for testing. The test results from the two laboratories should be compared using a statistical test for unpaired data, at a probability level chosen prior to the testing series. If a bias is found, either its cause must be found and corrected or future test results for that material must be adjusted in consideration of the known bias.

There may be a distinct difference in testing speed and tension devices of machines supplied by different manufacturers that may give differences in reported test results.

The measurement of hairiness is important to yarn producers. This guide is useful for process control and research of the yarn surface design at an individual manufacturing facility. Hairiness also is used to provide yarn processing machine design, and indications of malfunctioning process equipment, such as rotors, doffing mechanisms, guides, and travelers. It can be used to identify some causes of barreness and shade variation in fabrics.

SDO ASTM: ASTM International
Document Number D5647
Publication Date Jan. 1, 2007
Language en - English
Page Count 3
Revision Level 07
Supercedes
Committee D13.58
Publish Date Document Id Type View
Jan. 1, 2007 D5647-07 Revision
Sept. 10, 2001 D5647-01 Revision
Sept. 10, 1995 D5647-95 Revision
July 1, 2018 D5647-07R18 Reaffirmation
July 1, 2012 D5647-07R12 Reaffirmation