Patent ID: 7014884

Claim:
A method of forming a coated film of a thermoplastic material on a region of an inner peripheral surface of a cylinder so, that the coated film extends in a whole circumferential direction of said inner peripheral surface, said method comprising the step of: providing a coating apparatus comprising: a cylinder drive mechanism for rotating said cylinder in said circumferential direction about an axis of said cylinder; a paste applying machine for discharging a molten paste of said thermosplastic material kept molten by heating from a distal end of a nozzle; and a timing controller; said paste applying machine including a gun head provided with said nozzle, a gun head moving mechanism for moving said gun head and molten paste feed equipment for feeding said molten paste to said gun head; said timing controller being constructed in such a manner that operation timing of each of said cylinder drive mechanism, said gun head moving mechanism, and said molten paste feed equipment is determined so as to permit said cylinder to be rotated in said circumferential direction while keeping said nozzle arranged in a space in said cylinder and so as to permit said nozzle to be moved along a rotational center of said cylinder being rotated and within a range opposite to said region while keeping said molten paste discharged from said nozzle; discharging the molten paste of said thermoplastic material, which is kept molten by heating, from the distal end of said nozzle; arranging said nozzle in a space in said cylinder so that said molten paste is discharged toward the inner peripheral surface of said cylinder; moving said nozzle along the axis of said cylinder within a range opposite to said region while rotating said cylinder in said circumferential direction and discharging said molten paste from said nozzle; and spreading said molten paste applied to said inner peripheral surface by means of centrifugal force acting on said cylinder being rotated, to thereby wholly cover said region with said molten paste.