Manufacturing container or tube from paper; or other manufacturi – Bending – Folding
Patent
1999-01-21
2000-10-10
Sipos, John
Manufacturing container or tube from paper; or other manufacturi
Bending
Folding
493411, B31F 100
Patent
active
061296554
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL BACKGROUND
This invention relates to, in general, a method of folding and shaping a sheet and an apparatus for folding and shaping a sheet.
More specifically, it relates to a method of manufacturing a block body by folding and shaping a sheet formed with a single or a plurality of ridge-like fold(s) to which directional permanency of inward folding is imparted and a single or a plurality of valley-like fold(s) to which directional permanency of outward folding is imparted in parallel and alternately, and an apparatus therefor.
RELATED ART
It has been proposed to manufacture a block body by forming ridge-like folds to which directional permanency of inward folding (folding habit) is imparted and valley-like folds to which directional permanency of outward folding is imparted in parallel and alternately on a sheet having a hardness of some extent and capable of being folded easily such as a pasteboard or a corrugated cardboard and folding the sheet in zigzag fashion along the above-mentioned folds (Japanese Patent Application Nos. 6-103602,
It has been also proposed to manufacture a hollow block body by forming a plurality of ridge-like folds and a plurality of valley-like folds on a sheet as mentioned above in parallel and alternately and folding the sheet along the folds (Japanese Patent Application No. 7-237405).
In the above-mentioned prior applications, it is proposed that the above-mentioned block bodies be used for a frame body or cushioning member for packaging, a core member of an adiabatic panel, a supporting material for various kinds of adsorbent or the like.
In addition, it is proposed that the sheet is preferably pressed in the direction of folding along the respective folds in order to fold the sheet, formed with the folds as mentioned above, into a zigzag shape or into a block body.
It is, however, a problem that the sheet can not be folded and shaped smoothly and quickly when the sheet formed with the folds as mentioned above is placed on a planar surface and the folding pressure is applied to the sheet in the direction of folding along the respective folds by a suitable pressing means, because the part of the sheet is raised from the surface or bounds upward due to resilience of the folds of the sheet.
SUMMARY OF THE INVENTION
An object of the present invention is to provide a method of folding and shaping a sheet, which enables manufacture of a block body by quickly and smoothly folding the sheet, formed with a single or plural ridge-like fold(s) to which directional permanency of inward folding is imparted, and a single or plural valley-like fold(s) to which directional permanency of outward folding is imparted, in parallel and alternately.
Another object of the present invention is to provide an apparatus for folding and shaping a sheet, with which the method capable of solving the above-mentioned problem is performed more efficiently.
A method of folding and shaping a sheet according to a first embodiment of the present invention comprises a first step of supplying a sheet 1 formed with many ridge-like folds 10 and valley-like folds 11, in a spontaneously developed state, to a predetermined working position d and a second step of applying a folding pressure on the sheet 1 in the direction of bending along the respective ridge-like folds 10 and the valley-like folds 11 and imparting a pushing pressure on the sheet 1 lightly tending to widen the folding angles of the ridge-like folds and the valley-like folds from the beginning or in the course of applying the folding pressure.
In the spontaneously developed (spread) state, the respective ridge-like folds 10 and valley-like folds 11 of the sheet 1 are bent inward or outward at an obtuse angle in the direction of the folding habit, since ridge-like folds 10 and valley-like folds 11 of the above-mentioned sheet 1 have resilience of some extent, and the whole of the sheet is gently corrugated.
According to the method of folding and shaping a sheet of the first embodiment, in the process of applying the folding pressure to th
REFERENCES:
patent: 3434400 (1969-03-01), Hochfeld
patent: 4425111 (1984-01-01), Chazelas
patent: 5709771 (1998-01-01), Fritzman
Yamamoto Masahiro
Yokoyama Yoshimasa
Hitachi Zosen Corporation
Jensen Steven
Sipos John
Yokoyama Sankoh Co., Ltd.
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