Abstract
In many paper handling machines, the sound generated by impacts is a major noise source. It is shown that in typical impact line printers both nonresonant and resonant sound generating mechanisms are significant. Both can probably be controlled by increasing the backing bar stiffness of the printer while keeping the printing force constant. It is also shown that the paper-hammer-backing bar impact is responsible for paper impact noise below 1250 Hz. Above 2500 Hz the hammer-paper impact 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.
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