diameter of about 1 5 inches advantageously the dimensions are within 10 plus or minus of the preferred dimensions the width of the fingers 316 is less than the space 301 between rollers in order to provide clearance between the fingers and the rollers the width of the fingers can be about 0 25 inches the embodiment of fig4 shows a pair of pleat roller 402 driving a sheet of paper 400 in the direction of the indicated by the arrow 406 the backpressure is indicated by arrow 412 it should be understood that an equivalent backpressure is applied to each pleat roller the pleating action begins in the region upstream and proximate the projections of the fingers the formation of the pleats 420 can be adjusted by the movement of the fingers toward or away from the pleat rollers as indicated by arrows 404 in the embodiment of fig5 the pleating region is indicated generally as 500 the pleating rollers 504 and 506 are shown with their corresponding shafts 522 and 524 the direction of rotation is indicated by arrow 520 the fingers 508 and 510 are adjustable as indicated by arrows 514 the formed pleats are indicated by reference numeral 512 a the threaded member 518 is shown extending.