Improvements to paper web material dispensers, particularly two roll tissue dispensers. The system provides the user with a simulated environment that presents a business opportunity to understand and solve optimally. A connection line connects the signal lines to the shorting bar in such a manner to cross the cutting line. The step period generator further adjusts the ratio value according to the error signal, and generates a step time according to the adjusted ratio value and the average time range value. Finally, a pixel electrode is formed and a second repair pad on top of each of the first repair pads is formed to form a repair circuit. The solvent and operating conditions are controlled to maintain the aromatic carboxylic acid in solution in the reaction zone, and the aromatic carboxylic acid is crystallized in a downstream crystallizer, resulting in reduced impurity levels in the product.