oscillating bar granulating machine in which it was forced by moving steel bars through a coarse screen the product was a coarse granular powder which could be blended with low density polyethylene and extruded into uniform film as described in example 3 in the above examples 2 to 5 paraffin wax could be replaced for example by a low molecular weight polyethylene wax there is no limitation to low density polyethylene successful films could be blown from high density polyethylene there is no limitation to film blowing thick sections were extruded in other polyolefines and also starch filled polypropylene film was prepared by extrusion casting onto a chilled casting roller a slurry was prepared of corn starch in water by suspending 220 grams of undried maize starch in 1 liter of water sufficient ammonium molybdate was then dissolved in the suspension water to correspond to a final concentration of 12 of the weight of the starch this slurry was then introduced into the spray system of a laboratory spray drying unit by compressed air at 4 kg cm 2 and with the chamber air inlet temperature of 165 u00b0 and outlet temperature of 65 u00b0 c the product recovered from the output cyclone was a free flow dry white powder which was used as a filler for plasticised pvc compositions containing 50 p h r of d o p plasticiser and 0 5 p h r of lead stearate stabiliser the modified starch concentration being adjusted to 30 by weight of the whole formulation the mixing was accomplished on a steam heated 2 roll mill at 150 u00b0 c the product in the form of a sheet approximately 2 5 mm thick when compared with a.