Withdrawn Rationale:This test method determines the brightness of white, near-white, and naturally colored pulp, paper, and paperboard. Brightness is a commonly used industry term for the numerical value of the reflectance factor of a sample, with respect to blue light of specific spectral and geometric characteristics. This test method requires an instrument employing 45 ° illumination and 0 ° viewing geometry, with the illuminating and viewing beams adjusted so that translucent materials are evaluated on an arbitrary but specific scale.Formerly under the jurisdiction of Committee D06 on Paper and Paper Products, this test method was withdrawn in May 2010 because equivalent TAPPI and ISO publications exist.
![]() ![]()
Brightness, as specified by the TAPPI is the measurement of the amount of reflectance of blue light (Wavelength 457 nanometers, 44nm wide). There is also an ISO standard for measuring brightness (ISO 2469 - Paper, board and pulps - Measurement of diffuse radiance factor) but this is rarely used as the CIE whiteness scale is the more common measurement. Brightness of pulp, paper, and paperboard (directional reflectance at 457 nm), Test Method T 452 om-18 This method is for the determination of the brightness of white, near-white, and naturally colored pulp, paper, and paperboard.
Scope1.1 This test method determines the brightness of white, near-white, and naturally colored pulp, paper, and paperboard. Brightness is a commonly used industry term for the numerical value of the reflectance factor of a sample, with respect to blue light of specific spectral and geometric characteristics. This test method requires an instrument employing 45 ° illumination and 0 ° viewing geometry, with the illuminating and viewing beams adjusted so that translucent materials are evaluated on an arbitrary but specific scale (1-4).1.2 This test method is applicable to all naturally-colored pulps, and papers and board made from pulps.
The measurement is not suitable for paper and paperboard containing added coloring matter (such as yellow or green dyestuff) which appreciably absorbs light in that part of the spectrum extending from about 400 to 500 nm. Colored papers must be measured spectrophotometrically or colorimetrically in order to obtain meaningful results (TAPPI T442, T524, and T527).
![]()
This test method is, however, suitable for pulps or papers which contain optical (fluorescent) brightening agents.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.2. Referenced Documents (purchase separately)ASTM StandardsPractice for Sampling and Accepting a Single Lot of Paper, Paperboard, Fiberboard, and Related ProductTerminology Relating to Paper and Paper ProductsTAPPI StandardsT 1206 Precision statements for test methods.
![]() Comments are closed.
|
Details
AuthorWrite something about yourself. No need to be fancy, just an overview. Archives
March 2023
Categories |