| 摘要 |
It is intended to achieve a heating device which heats the liquid starch supplimentarily without using steam and also controls a temperature of the liquid starch to the gelatinization temperature without forming water drops during the production of the corrugated cardboard sheet. Single faced corrugated cardboard sheets K 1 and K 2 and a surface liner L 3 are preheated by preheat rolls 12a to 12c and the liquid starch g is applied to flute tops of corrugated media N 1 and N 2 by a gluing unit 16. The moist air having dew-temperature near the gelatinization temperature of the liquid starch g is sprayed to the flute tops from discharge parts 41a and 41b to gelatinize the liquid starch g. Then, the single faced corrugated cardboard sheets K 1 and K 2 and the surface liner L 3 are introduced to a double facer 90 to be heated and pressed by heat plates 96 and a belt conveyor 94 and bonded and dried to manufacture a double wall corrugated cardboard sheet D. By preheating the liquid starch g with the moist air, the liquid starch can be heated accurately to the gelatinization temperature and the overheating and formation of water drops can be prevented.
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