Method of manufacturing a magnetic recording medium
View Patent ↗A method of manufacturing a magnetic recording medium that includes a nonmagnetic underlayer, a magnetic layer, a protective layer, and a lubricant layer sequentially laminated on a nonmagnetic substrate. The method includes applying a lubricant onto the protective layer to form the lubricant layer, which includes ejecting shots of a heated lubricant liquid onto the protective layer from a nozzle. The heated lubricant liquid contains a perfluoropolyether lubricant, and each shot is of a quantity in a range of 0.1 to 10 pico liters.
1. A method of manufacturing a magnetic recording medium, the magnetic recording medium including a nonmagnetic underlayer, a magnetic layer, a protective layer, and a lubricant layer sequentially laminated on a nonmagnetic substrate, the method comprising:
applying a lubricant onto the protective layer to form the lubricant layer, including
ejecting shots of a heated lubricant liquid onto the protective layer from a nozzle, and
moving the nozzle in a radial direction of the magnetic recording medium while rotating the magnetic recording medium during the ejecting, wherein
the heated lubricant liquid contains a perfluoropolyether lubricant, and
each shot is of a quantity in a range of 0.1 to 10 pico liters.
2. The method of claim 1 , wherein the heated lubricant liquid consists solely of the perfluoropolyether lubricant.
3. The method of claim 1 , wherein the heated lubricant liquid is a solution of the perfluoropolyether lubricant dissolved in a fluorine-containing solvent with a concentration of at least 0.1 wt %.
4. A method of manufacturing a magnetic recording medium, the magnetic recording medium including a nonmagnetic underlayer, a magnetic layer, a protective layer, and a lubricant layer sequentially laminated on a nonmagnetic substrate, the method comprising:
applying a lubricant onto the protective layer to form the lubricant layer, including
ejecting shots of a heated lubricant liquid onto the protective layer from a nozzle, and
shifting a relative position between the magnetic recording medium and the nozzle in a raster pattern during the ejecting, wherein
the heated lubricant liquid contains a perfluoropolyether lubricant, and
each shot is of a quantity in a range of 0.1 to 10 pico liters.
5. The method of claim 4 , wherein the heated lubricant liquid consists solely of the perfluoropolyether lubricant.
6. The method of claim 4 , wherein the heated lubricant liquid is a solution of the perfluoropolyether lubricant dissolved in a fluorine-containing solvent with a concentration of at least 0.1 wt %.