Patent ID: 7325385

Claim:
A manufacturing method for a toner container provided with an opening, said method comprising: a fixing step of fixing a position of the toner container and substantially preventing movement of the toner container; a filling step of filling toner into the toner container, at a position of which is fixed by said fixing step, through the opening, wherein the toner has a true specific gravity which is not more than 2 and has a particle size which is not more than 20 microns; a closing step of setting a cover member and closing the opening with the cover member after said filling step; a pressing step of pressing the cover member to the toner container by a pressing mechanism after the cover member is set in the toner container in said closing step; and a sealing step of gradually welding the cover member and the toner container with each other by an ultrasonic vibration welding member which is in contact with a part of a portion to be welded while changing the contact portion around the opening; wherein when the welding is carried out in said sealing step, a temperature of the portion being welded is higher than a softening point temperature of the toner, wherein in said sealing step, the pressing mechanism presses the cover member at upstream and downstream portions, with respect to a moving direction of the welding member, of the portion being welded outside the part where the welding member is in contact with the part of the portion being welded.