to the gas feeding pipe and the gas exhausting pathway of the die according to the stretching ratio and the cooling rate of the tubular extrudate the anti blocking agent such as starch particles or the like which is fed to the connecting pipe between the gas feeder and gas feeding pipe of the die is scattered to the inside of the tubular extrudate from the tip of the gas feeding pipe just in front of the take off means thus as the gas is expelled by the take off means and the tubular extrudate becomes flat adhesion between the inside walls of the tubular extrudate is prevented in addition stretching toward the radial direction of the tubular extrudate adjacent to the die opening is controlled by the cylindrical guide to obtain the tubular extrudate having the uniform perimeter also extrudates having different perimeters can be obtained by changing the inner cylinder of the cylindrical guide to that having different perimeter and by adjusting the operation conditions of the extruder and the feeding conditions of the gas a preferred embodiment of the process for producing the edible proteinaceous film and the apparatus of the present inventions are illustrated hereinafter in detail with reference to the accompanied drawings fig1 is a schematic diagram showing an example of the apparatus for producing the edible proteinaceous film of the present invention including an extruder and circumferential devices fig2 is a partial enlarged cross section of the main part in fig1 wherein the die is attached to the front end of the barrel of the extruder in fig1 and 2 the extruder 1 is composed of the cylinder barrel 2 having the screw 2a and the die holder 3 the die 4 is fixed to the die holder.