Cartons with bellows folded tops

摘要

A carton has an openable bellows folded top comprising opposed side panels (30, 32) and front (34) and rear (28) panels folded in and sealed between said side panels, said panels being sealed together to close the top in a liquid tight manner, said top-forming front panel comprising an upper sub-panel comprising a central portion (44) having an upper free edge for defining the rim of a pull-out pouring spout and first and second flanking portions (46, 48) of unequal width lying each on a respective side of said central portion. The central portion is of a lesser height than said flanking portions and said central portion is not sealed on its interior face to the overlying side panels or to the rear panel in sealing the top. There is no step between two thicknesses and four thicknesses of paperboard moving vertically up the corner in the fin region at the junction of the front panel and the side panel and no step from four thicknesses of paperboard to two thicknesses moving along the fin away from the front of the carton. A reliable seal is formed but there is no obstacle to the pulling out of the pouring spout once the wing portions have been peeled apart.