Paper noise in an impact line printer

Abstract

In many paper handling machines, the sound radiated from impacts on paper is a major noise source. It is shown that in typical impact line printers both nonresonant and resonant paper vibration are significant mechanisms of sound generation. Both can probably be controlled by increasing the backing bar stiffness of the printer while keeping the printing force constant. The paper–hammer impact on the backing bar dominates paper impact noise below 1250 Hz. Above 2500 Hz the hammer impact on the paper is the dominant source. From 1250–2500 Hz the two impacts contribute equally to the sound generation. Finally, consideration of the design of a ’’quiet’’ paper leads to the suggestion of a paper with high density and low bending rigidity. This might be accomplished through microcreping of the paper.