| 摘要 |
PROBLEM TO BE SOLVED: To prevent pin holes from generating at a thinner part of the pouring- out port and at the base root part between the pouring-out port outer periphery and a flange part by a method wherein for the pouring-out port being ultrasonic- welded to a paper container main body, the radius of the tip of a groove at the thinner part, the opening angle and the opening width of the groove, are respectively specified. SOLUTION: A pouring-out port B is inserted in a pouring-out port attaching hole of a paper container A for liquid, from the inside, and welded by ultrasonic waves, and of which the sealing part can be unsealed by pulling a pull ring 5. For such a pouring-out port B, the tip 2a of a groove 2 on a thinner part 6 is formed into a curved surface of which the radius is 0.08-0.2mm. Also, the opening angle 2b of the groove 2 is specified in a range of 30-50 deg., and the opening width 2c of the groove 2 is specified in a range of 0.65-1.25mm. By doing so, when the pouring-out port B is welded to the paper container main body A with ultrasonic waves, pin holes and cut on the thinner part 6, or the base root part 4 between a pouring-out port outer periphery 3 and a flange part 1, can be prevented from generating, and the quality of an obtained product can be improved, and a speed up of the production can be done. |
