Abstract: In one embodiment, a fan control system includes a temperature-sensing device that is adapted to sense a temperature of a component and output a temperature feedback signal, and a pulse width modulation control circuit that is configured to receive the temperature feedback signal output from the temperature-sensing device and a separate fan command signal and, relative to those signals, generate a pulse width modulation signal that is sent to a pulse width modulation controlled fan.

Abstract: A thermoplastic web of indeterminate length is provided by forming a tubular thermoplastic web having interconnected filaments. The web is rotated about its axis while being advanced along its axis and is slit so as to provide a web having substantially parallel filament alignment at an angle to the longitudinal axis of the web. The web may be formed into a multiply structure having a plurality of webs wherein the filament alignment of at least one of the webs of the structure is at an angle to the filament alignment of at least one of the other webs of the structure.

Abstract: A mechanical fibrillator for use with a split film tape extrusion system which comprises means for guiding the tape through the fibrillator, rotating cutter means in the fibrillator, means for forcing the tape into contact with the rotating cutter means, and means adjacent the cutter for collecting dust created during fibrillation.