Method for producing magnetic tape in which a prescribed winding habit is imparted to the magnetic tape

1. A method for producing a magnetic tape comprising: a stage for winding a magnetic tape around a tape reel; and a stage for thermally treating the magnetic tape wound around the tape reel under preset thermal treatment conditions to impart a winding habit to the magnetic tape;

said magnetic tape being wound around a tape reel whose hub circumference is formed into a tapered/conical shape in said stage for winding a magnetic tape.

2. The method according to claim 1 , wherein said magnetic tape is wound around a tape reel whose hub circumference is formed into a tapered/conical shape by slanting the hub circumference depending upon the winding force of the wound magnetic tape.

3. The method according to claim 1 , wherein a rib is shifted from the central position of the hub of said tape reel in the width direction whereby the hub circumference is formed into a tapered/conical shape.

4. The method according to claim 1 , wherein the magnetic tape is wound around the tape reel in the state that the central position for winding the magnetic tape around the tape reel is shifted from the central position of the hub circumference of the tape reel whereby the hub circumference is formed into a tapered/conical shape.

5. The method according to claim 1 , wherein said preset thermal treatment conditions presets the temperature, the humidity, or both where the heating temperature is set to be just below the glass transition point of the base making up the magnetic tape, and where the humidity is set to be from 50 to 90%.

6. The method according to claim 1 , wherein said temperature just below the glass transition point of the base is a temperature up to 30° C. lower than the glass transition point.

7. The method according to claim 1 , wherein said thermal treatment is performed at a temperature sufficient for imparting given winding habit to the magnetic tape and not lower than a temperature which deteriorates performance of a base making up said magnetic tape.

8. A method for improving a winding form of a magnetic tape by imparting a winding habit to the magnetic tape, comprising: a stage for winding a magnetic tape around a tape reel; and a stage for thermally treating the magnetic tape wound around the tape reel under preset thermal treatment conditions to impart a winding habit to the magnetic tape;

said magnetic tape being wound around a tape reel whose hub circumference is formed into a tapered/conical shape in said stage for winding a magnetic tape.

9. The method according to claim 8 , wherein said magnetic tape is wound around a tape reel whose hub circumference is formed into a tapered/conical shape by slanting the hub circumference depending upon the winding force of the wound magnetic tape.

10. The method according to claim 8 , wherein a rib is shifted from the central position of the hub of said tape reel in the width direction whereby the hub circumference is formed into a tapered/conical shape.

11. The method according to claim 8 , wherein the magnetic tape is wound around the tape reel in the state that the central position for winding the magnetic tape around the tape reel is shifted from the central position of the hub circumference of the tape reel whereby the hub circumference is formed into a tapered/conical shape.

12. The method according to claim 8 , wherein said preset thermal treatment conditions presets the temperature, the humidity, or both where the heating temperature is set to be just below the glass transition point of the base making up the magnetic tape, and where the humidity is set to be from 50 to 90%.

13. The method according to claim 8 , wherein said temperature just below the glass transition point of the base is a temperature up to 30° C. lower than the glass transition point.

14. The method according to claim 8 , wherein said thermal treatment is performed at a temperature sufficient for imparting given winding habit to the magnetic tape and not lower than a temperature which deteriorates performance of a base making up said magnetic tape.