Abstract: Release papers and release paper backings (10) are disclosed. The release papers and release paper backings (10) can include a network of fibers (12) and yellow and/or red dye and a first coating (14) on a first surface (16). Light transmission through the release paper and release-paper backings (10) can be, for example, between about 40% and about 80% at a wavelength of about 680 nm. The Gurley density can be, for example, between about 4,000 seconds and about 10,000 seconds. The release papers and release paper backings (10) also can have a positive b* value on the International Commission on Illumination L*a*b* scale. Overall, the release papers and release paper backings (10) can have a greater ability to transmit light when compared with conventional release papers and release paper backings at some or all wavelengths in the visible spectrum.

Abstract: A method and apparatus for determining out-of-plane defects in a paper sample are described. One embodiment of the method includes providing a paper sample, illuminating the sample with light, determining light scattering resulting from the light at a plurality of measuring regions, and determining an out-of-plane defect value by assigning the measuring regions to plural bands, calculating a standard deviation of light scattering for each of the bands, and averaging standard deviations of the bands. An alternative embodiment further includes assigning the measuring regions to plural columns of the sample, determining the out-of-plane defect value for each of the columns, and calculating the median of the out-of-plane defect values of the columns. The average out-of-plane defect value may also be calculated. One embodiment of the apparatus includes a housing for excluding ambient light and for holding a paper sample, a light source, and an image-capturing device.

Abstract: A method and apparatus for determining out-of-plane defects in a paper sample are described. One embodiment of the method includes providing a paper sample, illuminating the sample with light, determining light scattering resulting from the light at a plurality of measuring regions, and determining an out-of-plane defect value by assigning the measuring regions to plural bands, calculating a standard deviation of light scattering for each of the bands, and averaging standard deviations of the bands. An alternative embodiment further includes assigning the measuring regions to plural columns of the sample, determining the out-of-plane defect value for each of the columns, and calculating the median of the out-of-plane defect values of the columns. The average out-of-plane defect value may also be calculated. One embodiment of the apparatus includes a housing for excluding ambient light and for holding a paper sample, a light source, and an image-capturing device.