A rotary forming apparatus is provided. The rotary forming apparatus includes a separator configured to receive a gas flow having entrained fibrous material and further configured to separate the fibrous material from the gas flow. The fibrous material forms mini-blankets having a length along a longitudinal axis. A milling apparatus is positioned adjacent the separator and configured to receive mini-blankets exiting the separator. The milling apparatus is further configured to grind the mini-blankets into fibers having desired lengths. The milling apparatus is configured to grind the mini-blankets along the lengths of the mini-blankets.