Role of Cellulose in Determining the Mechanical and Optical Properties of Two Soft Paper Roll Samples and Application in the Mechanics of the System of the Fourth Order Improved Runge-Kutta Method

White soft paper sample rolls from Glass Cleaning S.A. were tested for their tensile and optical properties as well as the fibre component of their pulps using the optical microscope. Also, other substrate properties of the two soft paper roll samples were determined i.e., ash content on ignition at 900 °C, brightness, basis weight, the band gap energy, and finally application in the mechanics of the system of the 4th order Runge-Kutta method of two different step sizes was implemented on the two wet paper strips used for determining their wet tensile strength.