Synthetic resin spout stopper

摘要

An improved synthetic resin spout stopper to be combined with a discharge port of a container is provided. The spout stopper does not pose difficulty in breaking an annular score formed in an annular flange wall, when discarding the container. Damage to the annular score is avoided even if a considerably great impact is applied to the spout stopper owing to a fall of the container. Damage to the annular score is also avoided even when ultrasonic welding is adopted for welding the container and the spout stopper together. In an inner peripheral edge part of the annular flange wall, an annular additional score is disposed adjacent to the annular score radially outwardly of and/or radially inwardly of the annular score.

主权项

1. 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; orradially 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.