Patent ID: 7540405

Claim:
A paper container for fluids, comprising; a spout plug including a spout positioned on a spout hole part configured to be cut and opened, a rotary opening blade and a cap, the spout plug being fitted to a top panel having the spout hole part; a spout hole formed in a paper base material sealed by the spout hole part, said spout hole part formed by a material other than said paper based material; and a cut and opened piece fall prevention mechanism provided in the spout hole part for leaving uncut a part of the spout hole part, said cut and opened piece fall prevention mechanism produced when the spout hole part is cut and opened by the rotary opening blade of the spout plug and for endowing the uncut part of said spout hole part with a hinge function, wherein the cut and opened piece fall prevention mechanism provided in the spout hole part is formed of a protrusion which is provided on a part of a periphery of the spout hole formed in the paper base material and which protrudes into the spout hole by extending the paper base material.