[ Problem Point ]
It wasn’t possible to make hot nitrogen gas while keeping the purity.
[ ⇒Kaizen Point ]
Nitrogen was heated by the Air Blow Heater.
Air didn’t get mixed and it was possible to make high temperature gas while keeping high degree of purity.
Related page:
No.68 Manufacturing of dryness steam of electric boiler 
No.47 Replacement of gas in laboratory electrified 
No.64 Metal Parts Drying after Washing 
No.65 Small high-temperature tunnel furnace heat source 
No.70 Heat source of nitrogen shield soldering iron 
No.71 Manufacturing of superheated steam 
No.77 Heating of tungsten material 
No.78 Dryness of Silicon wafers by the Nitrogen gas