passages 14 connected to manifolds 16 as can be seen in fig1 4 and 5 of the drawings and particularly fig4 and 5 a portion of distribution assembly 50 longitudinally extends in spaced relation from die body 7 and opposite the fluid attenuating outlet pairs 17 and the fluid material outlets 13 as can be seen in fig4 and 5 this includes a set of at least two parallel spaced first manifolds 52 with three such manifolds 52 being disclosed in fig5 to serve the three spaced die heads in unitary die body 7 each of external manifolds 52 is connected through a control valve 53 by a distribution manifold 54 to a common pressurized fluid source advantageously this source and the distribution assembly 50 can be so sized as to be capable of delivering attenuating fluid to die body 7 at a rate of up to six hundred 600 feet per second to be heated in die body 7 to a temperature of approximately nine hundred 900f degrees fahrenheit before dispensing through fluid attenuating outlet pairs 17 in die body 7 in accordance with one feature of the present invention and as can be seen in fig4 and 5 of the drawings each first distribution manifold 52 is provided with an elongated tapered slot 56 which tapers outwardly from the inlet of manifold 52 toward the opposite end of the manifold and away from and advantageously facing opposite connecting conduits 59 described hereinafter it is to be understood that the specific overall area of slots 56 and the angle of taper can be varied in accordance with the pressure and amount.