ASTM D8007-2019 pdf free download

ASTM D8007-2019 pdf free download.Standard Test Method for Wale and Course Count of Weft Knitted Fabrics
1. Scope
1.1 This test method covers the measurement of wale and course counts of weft knitted fabrics. Weft knit fabrics are made on circular or flat-bed knitting machines and include single- as well as double-knit fabric categories. Typical ex- amples of single-knits include jersey and single-pique fabrics; typical double-knits are rib, interlock, and swiss pique fabrics. 1.2 This test method is not applicable to warp knit fabrics such as tricot or raschel. 1.3 Wale and course counts are to be reported separately. 1.4 The values stated in inch-pound units are to be regarded as the standard. The values given in parentheses are mathemati- cal conversions to SI units that are provided for information only and are not considered standard. 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 appro- priate safety, health, and environmental practices and deter- mine the applicability ofregulatory limitations prior to use. 1.6 This international standard was developed in accor- dance with internationally recognized principles on standard- ization established in the Decision on Principles for the Development of International Standards, Guides and Recom- mendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
5. Significance and Use
5.1 If there are differences of practical significance between reported test results for two laboratories (or more), compara- tive tests should be performed to determine if there is a statistical bias between them using competent statistical assis- tance. As a minimum, ensure that the test samples to be used are as homogeneous as possible and drawn from the material from which the disparate test results were obtained. The test specimens are to be randomly assigned in equal numbers to each laboratory for testing. The test results from the partici- pating laboratories should be compared using a statistical test for unpaired data to a probability level chosen before initiation of the testing. If a bias is found, either its cause shall be found and corrected, or future test results for that material shall be adjusted in consideration of the known bias. 5.2 The results obtained by this test method may be used to determine if fabrics meet the tolerances for fabric counts given in Specification D3887.
7. Sampling
7.1 LotSample—As a lot sample for acceptance testing, take at random the number of rolls of fabric as directed in an applicable material specification or other agreement between the purchaser and the supplier. Consider rolls offabric to be the primary sampling unit. 7.1.1 Laboratory Sample—As a laboratory sample, take a full width swatch at least 2 yd (2 m) long from each roll of fabric in the lot sample. 7.1.2 Wale and course counts should be made no closer to a fabric selvage or tubular edge than one tenth ofthe width ofthe fabric or within 0.5 yd (0.5 m) of the end of the roll or piece. 7.1.3 Wale and course counts may be made on either the face or the back side ofthe fabric sample. Select the fabric side that allows for the best visual observation of the wales and courses. 7.1.4 It is not necessary to cut out swatches from the laboratory sample for each wale and course count to be taken. Consider each designated place at which wale and course counts are made as a test specimen. It is recommended that a wale and a course count be taken at the same site on the laboratory sample then at different locations along the length and across the width of the laboratory sample. 7.2 For garments or textile items that represent a laboratory sample, wale and course counts should be made at locations on different panels ofthe garments or products at least 2 in. (5 cm) away from seams, pockets, plackets, or other assembly sites.