Liquid storage bottle and method of manufacturing the same

A method of manufacturing a liquid storage bottle comprising:

• preparing a bottle body having a resin-made first cylindrical part at one end, the first cylindrical part having an opening at its front end, an outer peripheral surface provided with an annular groove extending in the circumferential direction relative to the outer peripheral surface, and a first contact surface continuously and radially outwardly extending from an axial base of the outer peripheral surface;
• preparing a tubular nozzle having a resin-made second cylindrical part at one end, the second cylindrical part having an inner peripheral surface to be disposed to face and contact the outer peripheral surface of the first cylindrical part, and a second contact surface continuously and radially outwardly extending from an axial base of the inner peripheral surface so as to be disposed to face and contact the first contact surface;
• and
• bonding the bottle body and the nozzle by means of spin welding by driving the bottle body and the nozzle to rotate relative to each other, while keeping the outer peripheral surface of the first cylindrical part and the inner peripheral surface of the second cylindrical part held in contact with each other, and inserting the bottle body into the nozzle down to the position where the first contact surface and the second contact surface contact each other,
• wherein both the resin forming the first cylindrical part and the resin forming the second cylindrical part become molten by the frictional heat generated due to the contact and the relative rotational motion of the outer peripheral surface of the first cylindrical part and the inner peripheral surface of the second cylindrical part during the operation of relatively inserting the bottle body into the nozzle, a part of the molten resin being driven to move forward in the inserting direction by the inserting operation and contained in the groove during the bonding.

A resin component comprising:

• a first member and a second member bonded to the first member,
• wherein the first member has a resin-made first cylindrical part at one end, the second member having a resin-made second cylindrical part at one end, an inner peripheral surface of the second cylindrical part being welded to an outer peripheral surface of the first cylindrical part,
• wherein the outer peripheral surface of the first cylindrical part faces the inner peripheral surface of the second cylindrical part being provided with an annular groove extending in the circumferential direction, the groove containing a part of the resin forming at least either the first cylindrical part or the second cylindrical part;
• wherein the first cylindrical part has a first contact surface continuously and radially outwardly extending from an axial base of the outer peripheral surface thereof, the second cylindrical part having a second contact surface continuously and radially outwardly extending from an axial base of the inner peripheral surface thereof, the first contact surface and the second contact surface contacting each other, and
• wherein the resin-containing groove is located between the region where the outer peripheral surface of the first cylindrical part and the inner peripheral surface of the second cylindrical part are welded to each other and the region where the first contact surface and the second contact surface contacting each other.

A method of manufacturing a resin component comprising:

• preparing a first member having a resin-made first cylindrical part at one end, the first cylindrical part having an opening at its front end, an outer peripheral surface provided with an annular groove extending in the circumferential direction relative to the outer peripheral surface, and a first contact surface continuously and radially outwardly extending from an axial base of the outer peripheral surface;
• preparing a second member having a resin-made second cylindrical part at one end, the second cylindrical part having an inner peripheral surface to be disposed to face and contact the outer peripheral surface of the first cylindrical part, and a second contact surface continuously and radially outwardly extending from an axial base of the inner peripheral surface so as to be disposed to face and contact the first contact surface;
• and
• bonding the first member and the second member by spin welding by driving the first member and the second member to rotate relative to each other, while keeping the outer peripheral surface of the first cylindrical part and the inner peripheral surface of the second cylindrical part held in contact with each other, and inserting the first member into the second member down to the position where the first contact surface and the second contact surface contact each other;
• wherein both the resin forming the first contact surface and the resin forming the second contact surface become molten by the frictional heat generated due to the contact and the relative rotational motion of the outer peripheral surface of the first cylindrical part and the inner peripheral surface of the second cylindrical part during the operation of relatively inserting the first member into the second member, a part of the molten resin being driven to move forward in the inserting direction by the inserting operation and contained in the groove.