Manufacturing container or tube from paper; or other manufacturi – Container making – Rigid container
Patent
1998-06-23
2000-10-17
Vo, Peter
Manufacturing container or tube from paper; or other manufacturi
Container making
Rigid container
493354, 493361, 493356, 229931, B31B 714
Patent
active
061323497
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
This invention relates to fold line structure of a corrugated fiberboard, in which the smooth, accurate folding of a corrugated fiberboard is enabled in the manufacture of a layered corrugated fiberboard structure of a predetermined shape or a porous hollow structure made of a corrugated fiberboard.
BACKGROUND ART
A technique of manufacturing a layered block structure id as shown in FIGS. 11 and 13, for example, has been already disclosed (See Japanese Patent Application No. Hei 6-103602). According to this technique, the layered block structure 1d is manufactured by the steps of forming fold lines like the inverted letter V, to which a directional folding property (i.e., an inclination to easily fold a corrugated fiberboard sheet) is imparted so as to allow the corrugated fiberboard sheet to fold in the shape of the inverted letter V (in a convex shape), and fold lines like the letter V, to which a directional folding property is imparted so as to allow the corrugated fiberboard sheet to fold in the shape of the letter V (in a concave shape), the two types of fold lines being parallel to each other in an alternating arrangement on the corrugated fiberboard sheet. The corrugated fiberboard sheet is then folded along the fold lines into a zigzag shape.
In addition, a technique of manufacturing a hollow block structure 1e as shown in FIGS. 14 and 15, for example, is disclosed in Japanese Patent Application No. Hei 7-237405. According to this technique, the hollow block structure 1e is manufactured by the steps of forming a plurality of fold lines like the inverted letter V and a plurality of fold lines like the letter V in parallel to each other in an alternating arrangement on a corrugated fiberboard sheet, and then folding the corrugated fiberboard sheet along the fold lines.
The layered or hollow block structure as described above is used as a frame structure or a cushioning material for packaging, a core material for a heat-insulating panel, a carrier for carrying adsorbents or the like.
In general, a corrugated fiberboard sheet is fabricated into a box by the steps of forming fold lines on the corrugated fiberboard sheet by pressing, and then folding the sheet along the fold lines.
In case of fabricating the corrugated fiberboard sheet into a box, the process of folding the sheet along the fold lines does not require high accuracy, and as a result, it is sufficient to form the folds by means of pressing. However, in the case where a layered or hollow block structure as described above is to be manufactured for the above purposes, there is a demand that such a block structure should be exact in shape and size according to the design. Thus, it is not possible to manufacture a block structure, which is fit for the above purposes, only by forming the fold lines in a manner similar to that in case of fabricating the corrugated fiberboard sheet into a box.
In the case where a layered block is manufactured by folding a corrugated fiberboard sheet in a zigzag shape along fold lines formed in advance on the corrugated fiberboard sheet, or a hollow block is manufactured by folding the corrugated fiberboard sheet, the following designs are generally adopted for fold lines, along which the corrugated fiberboard sheet is capable of being folded more accurately.
As shown in FIG. 8, for instance, in a first design fold lines 1a like the inverted letter V and fold lines 1b like the letter V are formed in parallel to each other, alternating between the two faces of the fiberboard sheet, in a halfway incised state (i.e., with cuts extending halfway through the thickness of the corrugated fiberboard sheet). The fold line cuts 1a, 1b intersect corrugated fiberboard flutes 10 and, subsequently, a directional folding property is given to each of the folds 1a, 1b by an appropriate folding mechanism (not shown).
As the result of giving the directional folding as described above, the fold lines 1a of the corrugated fiberboard sheet 1 shown in FIG. 8 take the shape of the inverted letter V, while the fold lin
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patent: 5117973 (1992-06-01), Lo Duca
patent: 5692672 (1997-12-01), Hunt
Hitachi Zosen Corporation
Luby Matthew
Vo Peter
Yokoyama Sankoh Co., Ltd.
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