A method for forming a zoned distribution of particulate material within a fibrous web includes a conveying step for providing a gas entrained supply of the particulate material and a segregating step centrifugally directing at least a portion of the particulate material into an accumulation region....http://www.google.com/patents/US5102585?utm_source=gb-gplus-sharePatent US5102585 - Method for intermittently depositing particulate material in a substrate
