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TAPPI T519 om-11
- Diffuse Opacity of Paper (d/0 Degrees Paper Backing)
- standard by Technical Association of the Pulp and Paper Industry, 2011
- Publisher: TAPPI
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1.1 This method provides a measure of diffuse opacity (paper backing) of white and near-white papers,previously known as "printing opacity."
1.2 The method may be employed for colored papers on condition that their reflectance (paper backing) isgreater than 20% and their diffuse opacity (paper backing) is greater than 45% (1).
1.3 The method is not suitable for highly transparent papers such as glassine.
1.4 This method employs d/0 geometry, illuminant C, and paper backing whereas TAPPI T 425 "Opacity ofPaper" employs 15/d geometry, illuminant A, both 89% reflectance backing and paper backing.
1.5 This method is similar to ISO 2471.
1.2 The method may be employed for colored papers on condition that their reflectance (paper backing) isgreater than 20% and their diffuse opacity (paper backing) is greater than 45% (1).
1.3 The method is not suitable for highly transparent papers such as glassine.
1.4 This method employs d/0 geometry, illuminant C, and paper backing whereas TAPPI T 425 "Opacity ofPaper" employs 15/d geometry, illuminant A, both 89% reflectance backing and paper backing.
1.5 This method is similar to ISO 2471.
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