Standard Test Method for Classifying and Counting Faults in Spun Yarns in Electronic Tests

Importancia y uso:

5.1 This test method is considered satisfactory for acceptance testing of commercial shipments of spun yarns by agreement between purchaser and supplier.

5.1.1 In case of a dispute arising from differences in reported test results when using this test method for acceptance testing of commercial shipments, the purchaser and supplier should conduct comparative tests to determine if there is a statistical bias between their laboratories. Competent statistical assistance is recommended for the investigation of bias. As a minimum, the two parties should take a group of test specimens that are as homogenous as possible and that are from a lot of material of the type in question. The test specimens should then be randomly assigned in equal numbers to each laboratory for testing. The average result from the two laboratories should be compared using statistical analysis and a probability level chosen by the two parties before the testing is begun. If a bias is found, either its cause must be found and corrected or the purchaser and the supplier must agree to interpret future test results with consideration to the known bias.

5.2 Yarn faults are a factor in determining yarn and fabric quality.

Subcomité:

D13.58

Referida por:

D4849-21

Volúmen:

07.02

Número ICS:

59.080.20 (Yarns)

Palabras clave:

classification; yarn fault count; yarn faults; yarn spun;