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Paper surface diffraction to characterise the fibre orientation distribution
Pereira, M.J.T.; Fiadeiro, P.T.; Silvy, J.Many paper mills use ultrasonic techniques to measure the Tensile Stiffness Index, TSI, of the paper sheet. They then assume that the TSI value is the same as the fibre orientation anisotropy. This is true if the paper is allowed to dry without any internal tension or elongation, but does not apply to paper manufactured in a paper machine. The paper machine introduces tension and elongation as soon as the fibre...
The Surface Measurement of Fibre Orientation Anisotropy and Misalignment Angle ...
Pereira, M.J.T.; Fiadeiro, P.T.; Jesus, M.E.P.; Silvy, J. J.The dimensional stability in fibre webs mainly depends of the fibre anisotropy and its orientation on the surfaces. These parameters are influenced during the manufacturing process, where the length and type of the fibres is determinant. The web quality control, in general, is performed based on the measurement of these parameters in the bulk of the fibre webs. This paper presents an optical laser diffraction m...
New method for the measurement of fibres orientation on the paper faces applied...
Pereira, M.J.T.; Costa, A.P.; Trindade, A.C.; Fiadeiro, P. T.; Silvy, J.; Tosio, J.M.SerraFor a given change in the humidity of a paper the hygro-instability of the sheet depends of two main factors: the sheet structural parameters which reflects its structure: the sheet porosity, the fibres orientation distribution mainly in the sheet plane and the variations of these parameters across the paper sheet thickness. the water reactivity of the components of the paper sheet which depends mainly of t...
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