Micro Perforating Machine

A machine for stamping lines of holes or perforations in sheets of postage-stamps or paper leaves, as in a cheek-book or receipt-book, to facilitate separation; a paper-perforating machine.Micro-perforations act as escape ports for the compressed air. When a sound wave compresses air against a micro-perforated surface, the air reaches a point where it's easier for it to enter the perforations than to continue compressing.