Sealed paper container

Claim 1

A sealed paper container, comprising: a container defined by a container body forming portion and a closure forming portion, said container having inner and outer opposite surfaces each provided with a thermoplastic synthetic resin coating layer, said container having a trunk of rectangular cross section, said trunk having four side walls with a horizontal breakable portion formed in three of said side walls close to an upper end of each and removable by tearing by hand, a remaining fourth side wall of the trunk being provided at the same level as the breakable portion with a joint forming portion positioned between said container body forming portion and said closure forming portion and formed by the removal of the breakable portion, said breakable portion and said joint forming portion serving as a boundary between said closure forming portion thereabove and said container body forming portion therebelow, said closure forming portion having a gabled roof with an upright portion formed at an upper end of said gabled roof, said container body forming portion having an engaging member secured to an inner side of its upper end, said engaging member having a projection extending upward for engaging with said closure forming portion to be exposed upon opening the container by the removal of the breakable portion, said upward projection of said engaging member extending along a lower end of said closure forming portion along an inner side thereof, said breakable portion being formed by upper and lower incisions arranged in a multiplicity of pairs discretely, said incisions being formed from outside the container and extending close to the inner thermoplastic synthetic resin layer.