Oil application roll for electrophotograph fixation and method of fabricating the same

摘要

Disclosed herein is an oil application roll for electrophotograph fixation, which comprises a roll base (1), an oil holder (10) provided on the roll base, and a porous fluororesin surface layer (4) provided on the oil holder. The porous fluororesin surface layer (4) has a maximum pore diameter of less than 0.1 mu m, an air permeability of 500 to 6000 s/100 cc, and a surface roughness of less than Ra 0.5 mu m. There is also provided a method of fabricating an oil application roll for electrophotograph fixation, which comprises the steps of (a) providing an oil holder on a roll base, (b) mounting a cylindrical film consisting of porous fluororesin having a thermal shrinkage of more than 30 % onto the oil holder to obtain a roll body, and (c) heating the roll body so that the oil holder is covered with the cylindrical film. The cylindrical film consisting of porous fluororesin has a maximum pore diameter of less than 0.1 mu m, a void ratio of between 25 % and 70 %, an air permeability of between 500 s/100 cc and 4000 s/100 cc, and a surface roughness of less than Ra 0.5 mu m.