time used a collision member 4 as the collision member fixed the pulverizing pressure to 6 5 kgf cm 2 g and used particles with an average particle diameter of 14 u03bcm as the material to be pulverized fig1 shows the results as can be understood from fig1 if the feed rate is within this range the nozzle of this embodiment has improved pulverizing performance when compared to a conventional nozzle the pulverizing performance when the pulverizing pressure was changed from 3 kgf cm 2 g to 6 5 kgf cm 2 g was further evaluated the other pulverizing conditions at this time used a collision member 4 as the collision member fixed the feed rate to 10 kg h and used particles with a particle diameter of 14 u03bcm as the material to be pulverized fig1 shows the results as can be understood from fig1 if the pulverizing pressure is within this range the nozzle of this embodiment has improved pulverizing performance when compared to a conventional nozzle next one example of test results showing the effects of improvements in the processing performance of this embodiment will be shown for the nozzle of this embodiment shown in fig1 a leading edge portion narrow tip nozzle portion 8 of a parallel nozzle.