Abstract: A paper container includes four body portion panels forming a cylindrical body portion having a square section. The paper container is configured so that upper ends of the body portion panels are continuously provided with a pair of gable roof-forming panels which include exterior top seal panels opposed to each other, and provided with a pair of gable wall-forming panels which include interior top seal panels opposed to each other. Any one of the panels serves as a spout and is to be opened. The gable wall-forming panels are folded out between the gable roof-forming panels, and the exterior top seal panels and the interior top seal panels are heated and sealed with each other at a predetermined position so as to be hermetically sealed.

Abstract: A paper container for fluid including a spout plug, in which the spout plug is formed of a spout positioned on a spout hole part for cutting and opening and incorporates a rotary opening blade and a cap. The spout plug is fitted to a top panel, which includes the spout hole part for cutting and opening in which a spout hole is formed in a paper base material and is sealed by a sealing layer. The contained further including a cut and opened piece fall prevention mechanism produced when the sealing layer is cut and opened by the rotary opening blade of the spout plug and capable of preventing a part of the cut and opened piece of the sealing layer from being cut off and giving hinge function to the uncut part of the cut and opened piece in the spout hole part for cutting and opening.

Abstract: A paper container for fluid having a spout plug, in which the spout plug (16) formed of a spout (14) positioned on a spout hole part for cutting and opening (12) and incorporating a rotary opening blade (13) and a cap (15) is fitted to a top panel (9) having the spout hole part for cutting and opening (12) in which a spout hole (10) formed in a paper base material (3) is sealed by a sealing layer (11), and a cut and opened piece fall prevention mechanism (26) capable of preventing a part of the cut and opened piece (11a) of the sealing layer (11) produced when the sealing layer (11) is cut and opened by the rotary opening blade (13) of the spout plug (16) from being cut off and giving hinge function to the uncut part of the cut and opened piece in the spout hole part for cutting and opening (12).