Stock material or miscellaneous articles – Structurally defined web or sheet – Nonplanar uniform thickness material
Patent
1996-11-12
1998-05-12
Loney, Donald
Stock material or miscellaneous articles
Structurally defined web or sheet
Nonplanar uniform thickness material
428 43, 428134, 428138, 428155, 428167, 428184, 428186, 428212, B32B 328
Patent
active
057502358
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
This invention relates to a base board for a layered corrugated fiberboard structure (corrugated fiberboard block) of a predetermined shape, capable of being accurately and easily folded in layers and of being easily handled when fabricating the layered corrugated fiberboard structure by folding a corrugated fiberboard or a corrugating medium having flutes (hereinafter referred to as "corrugated fiberboard material").
Such a layered corrugated fiberboard structure is used for forming cushioning materials, packing spacers, packaging pads, packages, fillers for building materials or pallets, heat insulating boards and gas filter elements.
BACKGROUND ART
Proposed in Japanese Patent Laid-open No. 6-227567 is, for example, a corrugated fiberboard cushioning material (base board for a layered corrugated fiberboard structure) fabricated by forming convex folds (folds having the shape of an inverted letter V) and concave folds (folds having the shape of a letter V) in parallel to each other in an alternate arrangement in a rectangular double-faced corrugated fiberboard.
The convex fold of the cushioning material is formed by cutting the component member of the double-faced corrugated fiberboard other than its inner linerboard that forms the inner surface when the double-faced corrugated fiberboard is folded.
On the other hand, the concave fold is formed by cutting through a plurality of portion (two or more portions) of the double-faced corrugated fiberboard, while leaving short unincised portions so that portions on the outer side of the short unincised portions are divided when the double-faced corrugated fiberboard is folded. Therefore, the resultant double-faced corrugated fiberboard is shaped such that only one of the linerboard portions is continuous in the short unincised portions in the concave folds.
More concretely, the convex folds and the concave folds are formed by pressing a press cutter on one surface of the double-faced corrugated fiberboard to cut portions of the double-faced corrugated fiberboard, in which the folds are to be formed, as described above, and folding the portions for the convex folds in a convex shape, while folding the portions for the concave folds in a concave shape.
The concave folds are formed by the foregoing method, because press cutters need to be pressed on the opposite surfaces of the double-faced corrugated fiberboard when the concave folds are formed similarly to the convex folds by cutting portions of the double-faced corrugated fiberboard other than the inner linerboard that forms the inner surface when the double-faced corrugated fiberboard is folded. Namely, an apparatus that presses the press cutters on the opposite surfaces of the double-wall corrugated fiberboard has a complicated construction, is expensive and operates at a very low processing speed and a low productivity.
The prior art base board for a layered corrugated fiberboard structure has the following disadvantages.
One of the disadvantages is that since only one of the linerboard portions is continuous in the short unincised portions in the concave folds, portions corresponding to the concave folds of the corrugated fiberboard are very weak, the corrugated fiberboard is apart along the folds during use and, consequently, the corrugated fiberboard cannot be reused.
Another disadvantage is that if the length of the short unincised portions of the concave folds is increased to strengthen the portions corresponding to the concave folds, portions of the corrugated fiberboard on the outer side of the concave folds are not broken along the concave folds when the corrugated fiberboard is folded along the concave folds, fissures are formed across the concave folds in boundaries between the unincised portions and the incised portions, and the corrugated fiberboard cannot accurately be folded along the concave folds by a mechanical means.
Accordingly, it is an object of the present invention to overcome the above disadvantages of the prior art base board for a layered corrugated fiberboard str
REFERENCES:
patent: 2503874 (1950-04-01), Ives
Hitachi Zosen Corporation
Loney Donald
Yokoyama Sankoh Co., Ltd.
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