Altra Filters, Inc., is the largest producer of coffee filters in the U.S., with plants on the east and west coasts. In the Riverdale, NJ, plant, the company operated five punch presses, each producing 50 filters per stroke. The filter paper was fed to the presses from 50 rolls mounted on backstands at about 60 strokes a minute, in a horizontal plane, so the continuous web of paper waste (matrix) fell downward as the press retracted. Altra

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