| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a plug of a paper container for liquid in which the pug is not contaminated with entering of water or dust or germs during a charging step of stored contents or at a distributing and storage process. SOLUTION: This plug is constituted by a spout 200 and a cap 100 threadably engaged with the spout. The spout has a pouring cylinder 220 vertically arranged at an inner circumferential edge of an upper surface of a seat ring 210. A contact sealing ring 111 of the cap is vertically installed at a lower surface of the top plate 110, an inner sealing ring 112 is vertically installed inside the contact sealing ring, a contact sealing ring 122 is vertically installed at an inner circumferential edge of a lower end of a circumferential wall 120, both the contact sealing ring and the inner sealing ring vertically installed at the lower surface of the top plate of the cap are closely contacted with the upper end of the pouring cylinder of the spout, and the contact sealing ring vertically installed at the inner circumferential edge of the lower end of the circumferential wall of the cap is closely contacted with the outer circumferential edge of the upper surface of the seat ring of the spout.</p> |
