Patent ID: 7963409

Claim:
A method of assembling a closure comprised of an overcap having a cover plate with an outer depending wall and a depending valve, a spout having a flange and a depending annular wall and with the flange having flat upper and lower surfaces and a terminal edge surface extending between the upper and lower surfaces and the flange and the depending wall having a L-shaped cross-section, and a double-sided induction heat sealing foil, the method comprising: fitting, in a factory, the spout to the overcap by sealingly engaging an outer surface of the valve with an inner surface of the annular wall with the upper surface of the flange closing against the cover plate and with the terminal edge of the flange spaced from the depending wall of the overcap, then placing, in a factory, the foil to cover at least a portion of lower surface of the flange, welding, in a factory, one side of the foil to the flange by induction heating prior to welding the other side of the foil.