Abstract: Paper towel rolls that exhibit novel combinations of physical properties, such as Basis Weight, Roll Density, and Roll Diameter, such that the paper towel rolls meet consumers' needs, and method for making such novel paper towel rolls and marketing such novel paper towel rolls are provided.

Abstract: Paper towel rolls that exhibit novel combinations of physical properties, such as Basis Weight, Roll Density, and Roll Diameter, such that the paper towel rolls meet consumers' needs, and method for making such novel paper towel rolls and marketing such novel paper towel rolls are provided.

Abstract: The invention relates to the integrity testing of a heat exchanger numeral 1 having a high-pressure section 2 and the low-pressure section 3 by using valves 5, 6, 11 and 12 it is possible to isolate the heat exchanger from the larger system or plant in which it is incorporated. Having isolated each section from the larger system the high-pressure section 2 is pressurised while maintaining the low-pressure section 3 and at this rate pressure. Then after a preset time the pressure in the low-pressure section 3 is measured and if it has raised then there is a leak. Similarly measuring a pressure drop in the high-pressure section 2 will provide the same result.