Patent ID: 8899442

Claim:
A synthetic resin spout stopper to be applied to a paper container having at least a synthetic resin film laminated to an inner surface or outer surface thereof, comprising: a protruding tubular wall allowed to protrude through or in succession to a spout hole formed in the container; an annular flange wall extending radially outwardly from an outer periphery of a lower end part of the protruding tubular wall; an upper surface or a lower surface of the annular flange wall being welded to an inner surface or an outer surface of the container; an annular score arranged in an inner peripheral edge portion of the annular flange wall; and at least one annular additional score arranged in the inner peripheral edge portion of the annular flange wall and being disposed adjacent to and one of: radially outwardly of the annular score; or radially inwardly of the annular score; a residual wall thickness at a location of the at least one annular additional score being larger than a residual wall thickness at a location of the annular score; and the synthetic resin spout stopper being removable from the container upon breaking the annular flange wall in an area of the annular score.