A new method for determining the relative bonded area

摘要

Correlations of scattering coefficient with sheet tensile strength and with sheet density were examined to see if they could be used to determine the scattering coefficient of an unbonded sheet,from which the relative bonded area (RBA) could then be calculated.The data showed that neither correlation was useful because the fiber cross-sectional shape in the sheet changes with the extent of wet pressing.A new method has been developed in which the scattering coefficient and sheet density are corrected for changes in the fiber cross-sectional shape.With the corrected data,the scattering coefficient was linearly related to sheet density,from which a simple new formula was derived for calculating the RBA.The total area available for bonding was not constant,so the RBA alone is not sufficient to describe fully the bonding in the sheet.