| 摘要 |
PROBLEM TO BE SOLVED: To easily adjust the quantity of the hot air to a required value by forming a heating device to be used in manufacturing a paper container to be pressed and sealed out of an inner surface heating oven and an outer surface heating oven, and closing unnecessary small holes among hot air blowing small holes arranged in the pattern. SOLUTION: In manufacturing a liquid paper container 20 made of a paper laminated material, hot air is blown against a sealing part 25 of the temporarily folded liquid paper container 20 to heat and melt a thermoplastic resin layer. In a heating device for a top part of the liquid paper container 20, more small holes 29 are provided in a comer part 11A of an inner surface heating oven 11 than small holes 27 provided in a part other than the corner part 11A. Hot air is blown against the part other than the corner part 11A, and closed small holes 28 are provided at the position of the inner surface heating oven 11 corresponding to the part against which excessive hot air is blown to provide more small holes 29 in the corner part 11A than the other part. Small holes for the heating oven are simply set, and a favorable sealing condition can be set. |
