Standard Test Method for Stiffness of Fabrics

Importancia y uso:

5.1 In general, these procedures are more suitable for testing woven fabrics than knit fabrics.

5.2 Both test options in this test method are considered satisfactory for acceptance testing of commercial shipments since current estimates of between-laboratory precision are acceptable and the method is used extensively in the trade for acceptance testing.

5.2.1 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 the 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 homogeneous as possible and that are from a lot of material of the type in question. Test specimens should then be randomly assigned in equal numbers to each laboratory for testing. The average results from the two laboratories should be compared using the appropriate statistical analysis and an acceptable probability level chosen by the two parties before 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.

5.3 The stiffness of a fabric may change with storage.

5.4 No evidence has been found showing that bending length is dependent on the width of the test specimen. The tendency for specimens to curl or twist will affect the result, because of the rigidity provided at the edge of the specimen. Consequently, the wider the strip, the less important is the edge effect. For fabrics having only a slight tendency to curl, a 2.5 cm wide strip has been found to be satisfactory. As the tendency to curl increases, this width may be increased (see Note 10).

5.5 This method differs from Test Method F3260 which requires tracking of sample surface orientation, and is used to evaluate absorbable and partially absorbable medical textiles.

Subcomité:

D13.60

Referida por:

D4032-08R16, F3260-18, F3510-21, F1891-19, D4850-23, D6828-02R19, F2733-21, D1048-24, F2320-18R22, D6575_D6575M-22, F2150-19, D5446-08R19

Volúmen:

07.01

Número ICS:

59.080.30 (Textile fabrics)

Palabras clave:

bending length, fabric; fabric; flexural rigidity, stiffness;