Q.M.I. Inc. of Pryor, Okla., has developed a machine that punches holes on blown film as it moves by as fast as 350 feet per minute.
Q.M.I. said the Vent Punch System punches the pattern at the proper spacing no matter how fast or slow the web moves, thanks to an optical encoder linked to an on-board computer. The machine punches holes ranging in diameter from an eighth of an inch to seven-sixteenths of an inch. A personal-computer-based controller stores up to 54 hole patterns.
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