double slot die assembly defines a pair of linear film forming surfaces 32 arranged in converging relationship to each other in accordance with the invention the double slot die assembly defines an elongated gas passage 34 for directing pressurized gas against molten polymer on both pair of linear film forming surfaces 32 film fibrillation is believed to occur once the path s of the film and gas intersect which may begin to occur as the film descends against the film forming surfaces and may continue to occur as the film is deposited into the gaseous stream in addition at least one fluid curtain nozzle 36 or u201c air curtain u201d nozzle is positioned in operative association with each film forming surface again while the use of air through the fluid curtain nozzle may be preferred the invention contemplates the use of alternate suitable gases such as nitrogen in another illustrative embodiment as shown in fig4 another die assembly 40 including a slot configuration wherein a pair of linear film forming surfaces 42 are defined and arranged in parallel relationship to each other further a pair of gas passages 44 arranged in converging relationship for each directing pressurized gas for impingement against respective film forming surfaces 42 in addition this embodiment further includes at least one fluid curtain nozzle 46 or u201c air curtain u201d nozzle is positioned in operative association with each film forming surface in yet another illustrative embodiment as shown in fig5 the slot configuration is also referred to as a single slot die assembly 50 which defines at least one gas exit passage 54 and one film forming surface 52 pressurized gas from a gas plenum.