ASTM D5867-12(R2020) pdf free download
ASTM D5867-12(R2020) pdf free download.Standard Test Methods for Measurement of Physical Properties of Raw Cotton by Cotton Classification Instruments
7. Calibration
7.1 Follow instrument manufacturers’ procedures for sample placement. 7.2 Calibration of Rd (color reflectance) and +b (color yellowness): 7.2.1 For color calibration of Rd and +b, calibrate using USDA color materials in accordance with instrument manu- facturers’ recommendations to establish a testing level consis- tent with the industry accepted Universal HVI Rd/+b Cotton Color Standards. 7.3 Calibration ofPercent Area (trash) and Particle Count (trash): 7.3.1 For trash calibration of percent area and particle count calibrate using USDA trash materials in accordance with instrument manufacturers’ recommendations. 7.4 Calibration ofMicronaire: 7.4.1 For calibration of micronaire, cotton calibration or orifice calibration methods are accepted practices within the industry. 7.4.2 For cotton calibration of micronaire, calibrate using Universal HVI Micronaire Calibration Cotton Standards in accordance with instrument manufacturers’ recommendations. 7.4.3 For orifice calibration of micronaire, calibrate using USDA micronaire materials in accordance with instrument manufacturers’ recommendations to establish a testing level consistent with the industry accepted Universal HVI Mi- cronaire Calibration Cotton Standards. 7.5 Calibration of Upper Half Mean Length, Uniformity Index and Breaking Tenacity (Strength): 7.5.1 For Upland saw ginned and roller ginned raw cotton testing, calibrate the instrument with Universal HVI Calibra- tion Cotton Standards (Short/Weak and Long/Strong). 7.5.2 For ELS saw ginned and roller ginned raw cotton testing, calibrate the instrument with Universal HVI Short/ Weak Calibration Cotton Standard and Extra Long Staple HVI Long/Strong Calibration Cotton Standard. 7.6 The calibration materials can be obtained from the USDA, AMS, Cotton Division’s Standardization and Engineer- ing Branch.
8. Scope
8.1 This section describes the measurements of Rd (color reflectance) and +b (color yellowness) for raw cotton. The Rd and +b measurements are based upon standards established by USDA. 8.2 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.
9. Summary of Test Method
9.1 A smooth representative surface of a cotton sample is placed in the color measurement area and pressed flat with a minimum force of 4 lb/in. 2 (0.3 kg/cm 2 ).
10. Significance and Use
10.1 Color is an element of cotton quality, and raw cotton color measurements are useful in controlling the color of manufactured greige, bleached, or dyed yarns and fabrics.
11. Procedure
11.1 One or more test replications shall be made on each subsample of the bale sample. 11.2 The surface ofeach subsample shall be large enough to completely cover the instrument’s measurement area and thick enough to be opaque (no light transmitted through the sample). An uncompressed minimum thickness of 2 in. (50 cm) and a minimum surface area of9 in. 2 (58 cm 2 ) ofeach subsample are required. 11.3 For the bale sample, report the average Rd (color reflectance) of the test replications to the nearest one tenth of a unit. 11.4 For the bale sample, report the average +b (color yellowness) of the test replications to the nearest one tenth of a unit.
12. Scope
12.1 This section describes the measurements of percent area (trash) and particle count (trash) for raw cotton. The percent area and the particle count measurements are based upon standards established by USDA. 12.2 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.
