JP2011084336A - Concave polyhedron sheet structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cylindrical concave polyhedron sheet structure that can be formed of a soft sheet. <P>SOLUTION: This concave polyhedron sheet structure is mainly covered with a pattern filled with hexagon planes composed of a pair of trapezoids (including triangles) sharing bottom sides to each other and some sides constituting the pattern are applied with some folding lines. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

The present invention relates to a cylindrical concave polyhedral sheet structure made of a flexible concave polyhedral sheet (paper, plastic, a laminate thereof, and the like).

In a metal drink can, a so-called diamond-cut can called a concave polyhedron is often used. This is due to the characteristic that the rigidity against the external pressure is about three times that of a cylindrical can having the same wall thickness. Secondly, the shape of the irregularities is excellent in design, such as hand feel and heat conductivity. (Non-Patent Documents 1 and 2)

Miura, K. et al. PCCP SHELLS, New Approaches to Structural Mechanics, Shells and Biological Structures, Kluwer Academic Publishers, 2002. Kosuke Miura, fold-from air bags to spacecraft-Invention Vol. 102, no. 1, pp. 30-35

However, the technology has been made possible by the plastic processing of thin metal cans, and it is almost impossible to produce similar structures with sheets such as paper.

On the other hand, materials such as paper are recommended materials from the viewpoint of the ecologic cycle. Therefore, if a diamond-cut can shape can be realized using these relatively flexible materials, the possibility of realizing a cylindrical structure having appropriate rigidity and flexibility is foreseen.

In order to solve the above-mentioned problems, the present invention provides a tubular sheet structure that combines moderate rigidity and flexibility with a sheet of paper or the like, and is excellent in design in terms of touch and thermal conductivity. To provide.

The concave polyhedron sheet structure according to claim 1 of the present invention is mainly covered with a hexagonal plane-laying pattern made up of trapezoidal (including triangle) pairs sharing a base, and fold lines are formed on the sides constituting the pattern. The concave polyhedral sheet structure is characterized by being imparted.

A concave polyhedron sheet structure according to claim 2 of the present invention is a concave polyhedron sheet structure in which a plurality of concave polyhedron sheets of claim 1 are combined to form a cylindrical shape.

According to a third aspect of the present invention, there is provided a concave polyhedral sheet structure in a container characterized in that an end of the cylindrical concave polyhedral sheet structure according to the second aspect is closed by a closure.

Embodiments of the present invention will be described in detail below.

The concave polyhedron sheet 1 that embodies the invention according to claim 1 of the present invention is mainly covered with a hexagonal plane-laying pattern 10 composed of trapezoidal (including triangle) pairs sharing a base, and constitutes the pattern. It is a concave polyhedron sheet characterized in that a crease 11 is provided on the side. FIG. 1 shows a sheet on which a crease 11 is formed by a plane-laying pattern 10 of a pair of triangles sharing the base. Since the limit of the small side of the trapezoid is a triangle and its essence does not change, it will be described in the following triangle.

In FIG. 2, the shape when the said concave polyhedron sheet | seat 1 is bent into a cylinder shape by making the up-down direction of a triangle into an axis line is shown. In this case where the crease is formed, the result is a concave polyhedron, just like the surface of a diamond-cut can, or simply a cylinder. The latter occurs when the folding line 11 is not sufficiently formed. In short, if the crease line of the pattern is properly formed in advance, it has a feature that it naturally becomes a concave polyhedron shape when it is bent.

The concave polyhedral sheet structure according to claims 2 and 3 of the present invention is a concave polyhedral sheet structure using a plurality of the concave polyhedral sheets of claim 1. FIG. 3 is a structure (FIG. 3, a front view, a cross-sectional view) made by bonding only the left and right edges of two sheets 1 and 2.

Now, the concave polyhedron sheet structure of the present invention has a unique shape characteristic in which flexibility and rigidity are mixed. It is clear that the concave polyhedron shape shown in FIG. 2 maintains exactly the same shape as a diamond-cut can if each triangular face is composed of a rigid flat plate.

However, as shown in FIG. 3, the two sheets have a folding line 11 inside, but the belt-like portions 12 on both sides have no folding line. Therefore, when the sheet is deformed into a cylindrical shape, the inside tends to have a diamond-cut shape, but the band-like portion tries to keep a plane regardless of the deformation. Furthermore, since these portions are joined to each other on the back side, there is a strong tendency to maintain a flat surface. As a result of these antagonistic forces, the diamond-cut shape on the surface close to the belt-like portion is held somewhat flat. As a result, the stable macroscopic shape of the sheet structure is a flat lens rather than a cylinder (FIG. 4).

In short, this sheet structure has two stable states. The first is a flat state where the fold line is not activated, and the second is a flat lens state. Since the sheet is originally a flexible sheet, the shape is changed depending on the load or restraint, but if the load or restraint is taken, it returns to a lens shape or a flat surface. In many cases, it is expected to return to a lenticular form. Of course, the diamond cut shape on the surface is maintained. Therefore, it deforms flexibly macroscopically, but can retain the rigidity of diamond cut locally. This is a very important property of the concave polyhedral sheet structure according to the present invention.

Another feature of the concave polyhedral sheet structure according to the present invention is the ease of production.
In short, the production only needs to provide a predetermined folding line to the flat sheet, so that the production is easy and can be executed at high speed.

Yet another feature of the concave polyhedron sheet structure according to the present invention is that, in many cases, the product can be stored flat, so that the cylindrical concave polyhedron is automatically activated when it is made cylindrical when in use. The effect is that the cost of storage and transportation can be reduced, but from a different perspective, its use as a packaging material appears in the field of view.

Hereinafter, specific examples of the present invention will be shown and described in detail. Example 1 is an example in which the concave polyhedral sheet structure shown in FIGS. 1 and 5 is used as a general-purpose basic material. Therefore, it has a cylindrical shape, has a high surface rigidity, and is rich in design. The shape can be freely designed macroscopically from a cylinder to a cone by appropriately changing a trapezoidal or triangular pattern. In addition, if there are some constraints inside and outside, the form is more stable.

Specifically, a typical example is to form a kind of reinforced cylindrical shell by joining a cylinder and a concave polyhedral sheet in contact with the cylinder. This is because the concave polyhedron sheet has a flexibility that a concave-convex shape is naturally developed by bending along a cylinder, and exhibits a high rigidity once fixed. Further, if a concave polyhedron sheet is inserted and joined between two thin cylinders, a sandwich cylindrical shell is obtained, and higher rigidity is obtained. Of course, these methods also apply to the conical case. FIG. 5 shows a design drawing of a truncated polyhedral concave polyhedron by making the triangular pattern not uniform and variable 20 depending on the position. Not only this but various concave polyhedron sheet structures can be constituted by various patterns and various combinations.

Example 2 is the utilization to a pouch packaging body (FIG. 6). As shown in FIG. 3, a rectangular front sheet 1 and a rear sheet 2 are overlapped. As shown by the dotted line in FIG. 6, a bottom closure 14 folded in half is loaded inside the lower end portion with the fold inside.

And the upper end part 13 joins both the edge parts 12 of the front sheet | seat 1 and both the edge parts 12 of the rear sheet | seat 2 as an unsealed opening part for filling the contents, The lower end part of the said front sheet | seat, a rear sheet | seat By appropriately joining the lower end portion and the bottom closure, a pouch package can be formed (FIG. 6).

Now, when the contents are filled in the pouch package, the sheets on both sides are transformed into a cylindrical concave polyhedron as shown in FIG. The cross section is shaped as shown in FIG. 4b. The sheet surface is a cylindrical concave polyhedron composed of diagonal mountain folds and horizontal valley folds. Both edge portions of the sheet become flat by joining, and the boundary surface with the cylindrical concave polyhedron becomes a transition region. In this example, the design is such that three rhombuses are formed in the lateral direction.

Since the equilibrium position can be controlled by the design of the folding line and the material characteristics of the sheet, a practically suitable shape can be obtained. Further, as described above, the elements constituting the pattern do not always have to be the same, and can be gradually changed depending on their positions, so that design diversity is wide.

As another example, a single sheet generates an appropriate pattern as in the above example, and a flat and highly rigid sheet is combined as a second sheet at the appropriate folding position. It is. By this restriction, a pouch package having extremely high rigidity can be obtained. A similar technique is to insert a flat third sheet between two normal pouch packs. In this case, the third sheet is for the purpose of restraint and does not need a function of wrapping, so it may be perforated, belt-shaped, or only a tension member.

In Examples 2 and 3, two sheets were used, but in some cases, it is obvious that these can be realized with one sheet.

The invention's effect

The concave polyhedron sheet structure of the present invention is macroscopically flexible but has excellent design properties such as locally maintaining the rigidity of the concave polyhedron, and in terms of touch and heat transfer.

In addition, the degree of freedom in designing the shape is high depending on the purpose of use, and it adapts to various requirements.

In addition, the manufacturing can be realized without a major change since only a step of applying a crease or a crease is added to a normal manufacturing apparatus.

Also, in many cases, these products can be stored flat and can be converted to a concave polyhedral sheet at the time of use, thereby reducing its storage and transportation costs.

Concave polyhedron sheet (1a front view, 1b longitudinal sectional view) Deformed polyhedral sheet after deformation (2a front view, 2b longitudinal sectional view, 2c plan view) Structure with two concave polyhedron sheets (3a front view, 3b plan view) Structure by two concave polyhedron sheets after deformation (4a front view, 4b plan view) Concave polyhedral sheet pattern (front view) with truncated cone shape Example of pouch packaging (perspective view)

1, 2 concave polyhedron sheet 10 trapezoidal or triangular pair pattern 11 crease or crease (dashed line ------)
12 Concave polyhedron sheet edge 13 Pouch package opening 14 Pouch package bottom closure 20 Variable triangle pair pattern

Claims (3)

A concave polyhedron sheet structure characterized in that it is mainly covered with a hexagonal plane-laying pattern composed of trapezoidal (including triangle) pairs sharing a base, and a crease is given to the sides constituting the pattern. A concave polyhedron sheet structure comprising a plurality of concave polyhedron sheets according to claim 1 combined to form a cylindrical shape. A container, wherein an end of the cylindrical concave polyhedral sheet structure according to claim 2 is closed by a closure.

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