| 摘要 |
PROBLEM TO BE SOLVED: To provide an ultrasonic sealing device for a paper container for a liquid which inhibits the formation of a resin lump and allows a sealed state to be checked by visual inspection.SOLUTION: An ultrasonic sealing device for a paper container for a liquid performs sealing by using a horn 3 and an anvil 2. The anvil includes at least three step surfaces which are parallel to each other and have different heights. The step surfaces are connected by slope surfaces. The first step surface is a welding surface 10 located closest to the horn. The second step surface is a welding lower limit surface 11 capable of reliably providing a minimum sealing ability in a range where sufficient sealing ability is provided. The third step surface is a welding upper limit surface 12 where an approach to the horn beyond the surface has a possibility of causing excessive welding processing and resulting in a defect in sealing ability. With regard to distances from the horn, the welding surface, the welding lower limit surface and the welding upper limit surface are away therefrom in this order. Thus, there is provided the ultrasonic sealing device for a paper container for a liquid.SELECTED DRAWING: Figure 1 |
