| 摘要 |
A base board for a layered corrugated fiberboard structure comprises a corrugated fiberboard material including a corrugating medium having flutes, first folds along which the corrugated fiberboard material is folded in the shape of the inverted letter V, and second folds along which the corrugated fiberboard material is folded in the shape of the letter V, and the first folds and the second folds are formed in the corrugated fiberboard material in parallel to each other and in an alternate arrangement so as to extend perpendicularly or at an angle other than a right angle to the flutes. The second folds are lines of perforations, and portions of the corrugated fiberboard material that forms an outer surface when folded are incised along the lines of perforations. Otherwise, the second folds may be formed by alternately arranging hinge portions, which have a predetermined length and are formed by crushing portions of the flutes of the corrugated fiberboard material, and cut portions or slits, which penetrate the corrugated fiberboard material, in portions of the corrugated fiberboard material in which the second folds are to be formed. The first and second folds are smoothly and surely formed by a pressing machine which works on one side of the corrugated fiberboard material. <IMAGE> |
