| 摘要 |
<p>A carton comprises opposite normally flat side panels, a normally flat transverse panel joined to the side panels along one edge of each of the side panels, an upper spout edge which is closed along a line cut across the transverse panel and angled downwardly in the side panels to first opposed flexure points in the side panels, a lower spout edge scored across the transverse panel, below the upper spout edge and angled upwardly in the side panels to the first flexure points, the lower spout edge intersecting each said edge of the side panels at said flexure points, and a score line extending from each of the first flexure points angularly downwardly to third flexure points at each said edge of the side panels below the second flexure points, the transverse panel thus providing, between the third flexure points and the lower spout edge, a trigger surface that can be pressed to swing inwardly of the carton about the third flexure points, forcing the lower spout edge and the second flexure points inwardly, and the side panels to bulge outwardly at the first flexure points, until the second flexure points lie in a common plane with the other flexure points, after which further inward movement of the trigger panel is assisted by pressure from the outwardly bulged side panels, whereby the second flexure points are urged farther inwardly and the upper spout edge is urged to extend outwardly by the pressure from the bulged side panels and the spout is held open. A carton blank is adapted to be erected into a such carton having an openable and recloseable pouring spout.</p> |
