papr4 - 1 Paper Properties Lecture 4 PAPR 1000 Introduction...

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Unformatted text preview: 1 Paper Properties Lecture 4 PAPR 1000 Introduction to Pulp and Paper Manufacturer 2 Paper Properties Physical Optical Surface Structural Strength Wetting 3 Light The different colors of visible light are associated with different wavelengths or frequencies. The wavelength is measured in nanometers 4 Visible Light Spectrum 5 Optical Theory When light hits the surface of paper, it is reflected, absorbed, transmitted or scattered. Transmitted light passes through the paper, absorbed light is transformed into heat, and scattered light is re- emitted from the surface. 6 Optical Theory The mechanisms for light scatter are: Reflection: Light reflects off the surface of the particle Refraction: Light bends when it enters and exits a medium The combination of light reflection and refraction is called light scatter. 7 Optical Properties Brightness is defined as the amount of light reflected with a wavelength of 457 nm. (this is the region most sensitive to the effects of bleaching).sensitive to the effects of bleaching)....
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papr4 - 1 Paper Properties Lecture 4 PAPR 1000 Introduction...

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