Small area coating weight distribution.
Published: 2004
Language: eng
Number of pages: 100
Description: Paper is often coated to improve its printability. However, nonuniformities in the coating layer could result in poor print quality. The existing techniques for assessing coating uniformity fail to provide quantitative information at a high resolution. In this study, a method is developed to determine the coating weight distribution with a resolution of 100 mum using Fourier Transform infrared (FTIR) microspectroscopy.Both polyethylene terephthalate (PET) films and Thermomechanic pulp (TMP) paper were coated with a range of coating weight and formulations. The samples were scanned under an FTIR microscope. Different spectral filtering methods were used to reduce the noise in the spectrum. The spectra were correlated to the coating weight using partial least square (PLS) technique. These PLS models were able to predict the coating weight with a root mean square error better than 4.1 g/m2. However, it was found that PLS model predictions for PET films were generally better than those of TMP paper. It was also found that roughness had a significant impact on spectral data and on the model performance.
Notes: Adviser:  Ramin Farnood.

Thesis (M.A.Sc.)--University of Toronto, 2004.

Electronic version licensed for access by U. of T. users.

Source: Masters Abstracts International, Volume: 42-06, page: 2268.

MICR copy on microfiche (2 microfiches).