JP2000185728A - Flanged container - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a flanged container having a high air-tightness, a high container rigidity and showing low cost. SOLUTION: This flanged container is attained by bending and forming a die-punched-out sheet characterized in that there are provided a bottom surface corresponding section 3, each of side wall corresponding sections 2 adjacent to each of the sides of the bottom surface corresponding section, and each of flange corresponding sections 1 adjacent to the outside part of it; and there is provided a deformed fan-shaped section (c) in which a side wall flap corresponding section 5 and a flange flap corresponding section 4 are continuously and integrally formed outside a corner part of each of the adjoining sides to each other without being separated from each other.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a flanged container obtained by bending a punching die sheet.

[0002]

2. Description of the Related Art A conventional container with a flange obtained by bending a punching die sheet has the following various problems.

That is, the conventional example shown in FIGS. 1 (a) to 1 (d) is a container with a flange (hereinafter referred to as a conventional container) formed by bending a paper sheet mainly used for processed foods which can be stored. ), Which is composed of a container body a and a lid sheet b, and after the contents are filled in the container a, the lid sheet b is tightly integrated with the container by means such as heat sealing. The primary purpose of this type of container is to prevent the sap of the contents from leaking out over a long period of time, and then to prevent the invasion of bacteria and the like from the outside, and to prevent the invasion of oxygen, which causes the deterioration of the contents. There are three.

In particular, conventional containers (FIGS. 1 (a) to 1 (d)) obtained by bending and forming from a flat die-cut sheet are formed in a bent portion of a container body a and a sealing portion with a lid sheet b. The occurrence of cuts and holes (hereinafter referred to as communication holes) communicating with the inside and outside of the container a has been unavoidable due to the structural characteristics of the container itself.

More specifically, it is impossible that the side wall flap 4 and the flange flap 5 are separated from each other at the bent portion 6 (FIG. 1 (c)) to form a bent sheet while being adjacent to each other. Therefore, the occurrence of the cut-shaped communication hole in the portion 6 is not prevented. In addition, since the flange flap 5 and the flange 1 are joined and fixed to each other in a stepped state at the joint portion 7 (FIG. 1B), the lid sheet b is heat-sealed by being overlapped on the portion from above.
A communication hole of a triangular cylindrical shape communicating between inside and outside appears.

[0006] The next disadvantage is that when the conventional container body "a" is bent and integrated with the cover sheet "b", heat sealing,
Since the processing surface for bonding and fixing by hot melt etc. was forced to extend over both sides of the punched die sheet, it was necessary to adopt an expensive sheet with double-sided polycoat specification or double-sided polylaminate specification. .

[0007] Further, when the conventional container is bent,
Since the flange flaps 5 and the side wall flaps 4 have an independent structure that does not support each other, and the side wall flaps 4 are tightly fixed to one side wall 2 without being made axially symmetric, and thus have an unstable structure. Since the rigidity in each direction at the corner of the container did not improve as expected, the punched sheet had to be used as a thick gauge.

[0008]

SUMMARY OF THE INVENTION In view of the above problems, the present invention relates to a closed type flanged container obtained by bending a flat sheet in the field of food packaging materials and the like. Without changing the method of assembling the container with the flange, the new shape of the die sheet before assembly and the arrangement of the ruled lines have been improved to achieve high airtightness, high container rigidity and low cost that could not be expected until now. The aim is to realize a container with a flange.

[0009]

In order to achieve the above object, in the flanged container according to the present invention, the bottom-equivalent portion, the side wall-equivalent portions adjacent to each side thereof, and the flange-equivalent portions adjacent to the outside thereof are provided. In addition to the above, a deformed fan-shaped portion is provided outside the corner portion of each side so as to be continuously integrated without separating the side wall flap equivalent portion and the flange flap equivalent portion from each other.

[0010] Preferably, the punching die sheet is provided with a ruled line at a position in the deformed fan-shaped portion that separates the side wall flap equivalent portion and the flange flap equivalent portion.

Still preferably, in the deformed fan-shaped portion, a plurality of ruled lines are provided radially outward starting from a main portion or a periphery thereof, and a part or all of the radial ruled lines are provided on the outside. It is to be provided in a waist-folded shape while extending.

[0012] Preferably, the deformed fan-shaped portion is taken out of the container and bent to be axially symmetric.

[0013]

Preferred embodiments of the present invention will be described below in detail with reference to the accompanying drawings. In the drawing, the ruled line on each die sheet plan view has a solid line displayed as a mountain line and a dotted line as a valley line, and the thick solid line around the figure is a contour line.

In order to maintain the airtightness near each corner of the container a, as shown in FIGS. 2. The unique three-dimensional structure of the present invention (folded structure formed as a single leaf sheet, folded without scissors and glue, and restored to a single leaf sheet again) is formed at each corner. It was provided in. As shown in FIGS. 2 (a), 3 (a), and 4 (a), the three-dimensional structure is made possible by a deformed fan-shaped portion c provided near each corner and substantially parallel from the middle. A plurality of ruled lines are radially provided in the outer edge direction with a base point near the fan-shaped portion c as a base point, and the radial ruled line is bent at a ruled line 8 substantially orthogonal to the ruled line. A major feature of the present container is that it is provided as a substantially parallel ruled line.

As shown in FIGS. 2C and 3C, the three-dimensional structure is taken out of the container a and provided, and the bottom of the container a and both corners of the opening are formed. It is also a feature of the present invention that the connected line segments are bent so as to be axially symmetrical and divided right and left.

It is preferable that the deformed fan-shaped portion c is provided with five or four radial ruled lines based on the point, but only one to five radial ruled lines near the key are provided. May be. The base points of the above-mentioned radial ruled lines are shown in FIG. 4 (a), FIG. 5, FIG. 6 (b) to FIG. 9 (b).
Or a plurality as shown in FIGS. 2 (a) and 3 (a). Further, the number of the substantially parallel ruled lines may be four, preferably five.

A ruled line 8 (hereinafter, referred to as a divided ruled line 8) that divides the radial ruled line and the substantially parallel ruled line across is shown in FIG.
It is preferably provided as a polygonal line as shown in FIGS. 3 (a), 3 (a) and 4 (a). In addition, although not shown, a simple straight line, a curved line, or a set of a straight line and a curved line The present invention is also effective in the present invention also in a combination shape or a combination shape of a plurality of curved lines having different curvatures. Furthermore, the dividing ruled line 8 is not provided on the punching die sheet in advance, and at the position corresponding to the dividing ruled line 8 at the time of forming the bending of the punching die sheet, a bending deformation like a ruled line or a curvature having a minute curvature is caused by mechanical external force. Deformation is also effective in the present invention.

As shown in FIG. 5, if the maximum width of each radial ruled line in the deformed fan upper part c is A and B, and the end width of each substantially parallel ruled line is C and D, the width between the respective width dimensions is between It is preferable that the relations of B ≧ A, D ≧ c / 2, and BA ≦ D−c / 2 hold simultaneously.

As shown in FIGS. 2 (b) and 3 (b), at one corner of the flange of the container a or at the local portion of the circumference thereof, the two flanges 1 in a right angle direction or a circumferential direction mutually intersect at a predetermined angle. The flanges 1 are bent and formed in the same plane on the central surface of the flange flap 5 without any step, and are bonded by heat sealing or hot melt. Is to be fixed by means.

The container a obtained by bending the punching die sheet and bonding and fixing it at a predetermined flap 5 is:
After the contents are filled, the lid sheet b and the flange 1 are completely sealed by heat sealing.

FIGS. 6 (a), 6 (b), 7 (a), 7 (b), 8 (a), 8 (b), 9 (a), 9
In (b), the shape of the corner of the flange 1 of the container a is set to be a right angle, a large chamfer, a small chamfer, or a small curved chamfer, and the plane shape of a punching die sheet that enables the chamfer is illustrated. I have.

FIG. 3 (b) shows an example of a blanking sheet in which the corners of the flange have a substantially circular arc shape, and FIG. In addition, although not shown, any one in which the corner of the flange 1 projects in a tongue shape together with the flange flap 5 is effective for the present invention.

The shape of the bottom surface 3 of the container a and the shape of the opening of the flange 1 are rectangular and circular in FIGS. 2 (b) and 3 (b), and six in FIG. 4 (a). A square die sheet is illustrated, but in addition to this, a triangle,
There are pentagons, octagons, and other regular or non-equilateral polygons, and the corners of the polygon are chamfered, large, and small curved. In addition to this, there is an elliptical overall container shape, a shape in which curved lines and straight lines are appropriately combined, a star shape, and the like, in which the shapes of the bottom and the opening are not similar and different ones are selected from the above shapes. All of them are effective for the present invention.

The vertical cross-sectional shapes in the vicinity of the corner at the end of each side of the bottom surface of the container a are shown in FIGS. 2 (b), (c) and (d).
In FIGS. 3 (b), 3 (c) and 3 (d), and FIGS. In addition, although not shown in the drawings, the vertical cross-sectional shape at the corner of each side of the bottom surface may be large or small curved, and any of them is effective for the present invention.

In order to improve the out-of-plane rigidity of the flange 1 of the container a, it is also effective in the present invention to provide a folded portion on the outer edge, the entire length or a part of the flange-equivalent portion 1 of the punching sheet. It is.

Since the container a is required to have an airtightness, water resistance, light-shielding properties, and suitability for sealing by heat and electromagnetic waves, etc., since the container a is integrated with the cover sheet b, a laminate of a plastic sheet is used as the sheet material. It is preferable to use paper, plastic-coated paper, etc.,
In addition, there are artificial paper such as plastic, a metal sheet coated with poly-laminate or poly-coated metal, a plastic sheet metal-deposited, and the like. Any sheet obtained by appropriately combining and combining them is effective for the container a of the present invention.

Since the three-dimensional structure, which is a feature of the present invention, is extremely fundamental, the container a formed by adopting the structure is not limited to its shape and material, but allows various application changes. For example, the bottom, the shape of the opening, the dimensional ratio between the bottom and the side wall, the local shape of the bottom, the opening, the width and the shape of the flange, and the physical properties and material of the punching die sheet. Are all effective in the present invention.

In the die-cut sheet for containers of the present invention, since the deformed fan-shaped portion c is provided as a unitary structure of the side wall flap 4 and the flange flat 5, it is inevitable from the structure of the conventional container in which both flaps are cut off. It has become possible to completely eliminate the communication hole of the bent portion 6 which has been formed.

Since the deformed fan-shaped portion c is bent axially symmetrically by the take-out method to the outside of the container, the container a is obtained. As a result, first, each of the two large flanges 1 at the corner of the container is obtained. Are bonded to each other at an angle of approximately 45 degrees in the same plane as if they are backed by the flange flap 5, so that the degree of adhesion is increased, and the communication hole is formed during heat sealing with the lid sheet b. Double flanges 1 that easily occur
Was completely eliminated.

Second, when the container a is bent and the container a
At the time of bonding and fixing the cover and the lid b, the heat sealing surface can be limited to one side such as a paper sheet. Third, since the fan-shaped portion is bent and formed to be axially symmetric, the deformation strain which tends to concentrate on a specific location as in the conventional example is dispersed, and the deterioration of the material of the sheet and the occurrence of damage are suppressed beforehand. I was able to do it.

Since the radial ruled lines in the deformed fan-shaped portion c are bent halfway, the bending of the flange 1 and the flap 5 can be reliably and easily performed at the time of forming the container.
In particular, it has become possible to suppress the stretching strain and breakage damage of the sheet near the boundary between the flange 1 and the flap 5.

By providing the dividing ruled line 8 in the deformed fan-shaped portion c, it becomes easy to bring the flange flap 5 into close contact with the flange 1 and the side wall flap 4 into or close to the side wall 2 when the container a is bent. As a result, the heat sealing area between the flange flaps 5 can be sufficiently increased.

Since the deformed fan-shaped portion c is bent and fixed together with the side wall 2, the flange 1, and the bottom surface 3 by means such as heat sealing, a three-dimensional structure unique to the present invention is formed at the corner of the container. It has high rigidity against external force in each direction.

Since complicated cuts and ruled lines are eliminated in the deformed fan-shaped portion c and its peripheral portion, and ruled lines which are completely axially symmetric are provided, the vertical acting force is almost sufficient for the formation of the bend. In the processing process using a box making machine, it became possible to form a bend in a very short time with a single shot and heat sealing operation.

[0035]

Advantages of the Invention In the container of the present invention, the communication hole in the bent portion 6 and the joint portion 7 which is inevitably required from the shape of the punching paper in comparison with the conventional paper tray container is completely removed by the punching paper provided with the deformed fan-shaped portion c. As a result, the airtightness of the tray container a main body as well as the airtightness such as heat sealing with the lid sheet was greatly improved.

2. By making the radial ruled lines in the deformed fan-shaped part c bent and arranged axially symmetrically,
The occurrence of damage at the time of bending the container a was suppressed, and the shape stability and the product yield after the formation were improved.

3. Due to the dividing ruled line 8 in the deformed fan-shaped portion c, the heat sealing area between the flange flaps at the time of bending can be increased, and as a result, the airtightness of the corner of the container a and its rigidity are enhanced.

4. The three-dimensional structure formed by bending the deformed fan-shaped portion c greatly improved the vertical rigidity of the corner of the container a, so that it was possible to reduce the thickness of paper and the like.

5. Since the deformed fan-shaped portion c is taken out of the container and bent so as to be axially symmetric, the heat seal is limited to only one side of the sheet, and hot melt means is not always required.

6. Since all the ruled lines in the deformed fan-shaped portion c were provided as a simple and symmetric arrangement,
Automatic box making by the caser was facilitated, and as a result, the productivity of the container a was greatly improved.

7. As a sum total of the effects of 2, 4, 5, and 6, it has been confirmed that the product cost of the various containers a such as the tray of the present invention is reduced by 15% to 25% under the same performance condition as the conventional container.

8. This container (a), as an airtight packaging material for food, exhibits the effects of maintaining freshness, preventing deterioration of materials, preventing decay, etc., and also achieves a high degree of hermeticity and external shielding under low cost and low environmental load conditions. Because it can be used, it is expected that the packaging material for medical supplies, medical materials, and packaging materials for small precision industrial parts will have an effect that has not been expected so far.

[Brief description of the drawings]

FIG. 1 shows a conventional container, (a) is a plan view of a punching die sheet, (b) is an overall oblique view, (c) is a partial oblique view from the back side, and (d) is a bent forming process. FIG.

FIG. 2 shows a container having a rectangular bottom surface according to the present invention;
Is a plan view of a blanking die sheet, (b) is a partial oblique view from the back, (c) is a partial oblique view from the back side, and (d) is a partial oblique view in a folding forming process.

FIG. 3 shows a container having a circular bottom surface according to the present invention;
Is a plan view of a blanking die sheet, (b) is a partial oblique view from the back, (c) is a partial oblique view from the back side, and (d) is a partial oblique view in a folding forming process.

FIG. 4 is a plan view of a die sheet of a container having a hexagonal bottom surface according to the present invention.

FIG. 5 is an explanatory view of a partially cutout sheet plane of the present container in a rectangular shape showing dimensional conditions.

FIGS. 6A and 6B show different shapes of the corners of the flange from those of the above example, FIG. 6A is a partial perspective view thereof, and FIG.

7A and 7B show different shapes of the corners of the flange from those of the above-described example, FIG. 7A is a partial perspective view thereof, and FIG.

FIGS. 8A and 8B show different shapes of the corners of the flange from those of the above example, FIG. 8A is a partial perspective view thereof, and FIG.

FIGS. 9A and 9B show different shapes of the corners of the flange from those of the above example, FIG. 9A is a partial perspective view thereof, and FIG.

[Explanation of symbols]

a Container main body or blanking sheet b Lid sheet c Deformed fan-shaped part 1 Flange or flange equivalent part 2 Side wall 3 Bottom or bottom equivalent part 4 Side wall flap or side wall flap equivalent part 5 Flange flap or flange flap equivalent part 6 Flange flap and side wall Flap boundary bent part 7 Flange joint part 8 Separate ruled lines A, B, C, D Width of each radial ruled line or each substantially parallel ruled line

Claims (4)

[Claims] 1. A bottom surface equivalent portion 3, a side wall equivalent portion 2 adjacent to each side thereof, and a flange equivalent portion 1 adjacent outside thereof are provided, and a side wall flap equivalent portion outside a corner portion of each side. A container with a flange obtained by bending a punched die sheet, characterized in that a deformable fan-shaped portion c is provided, which is continuously integrated without separating the 5 and the flange flap equivalent portion 4 from each other. 2. The punching die sheet according to claim 1, wherein the deformed fan-shaped portion c is provided with a ruled line 8 at a position separating the side wall flap equivalent portion 5 and the flange flap equivalent portion 4. Flanged container. 3. In the deformed fan-shaped portion c, a plurality of ruled lines are provided radially outward with a base portion or a periphery of the portion as a base point, and a part or all of the radial ruled lines extend outward. The flanged container according to claim 1 or 2, wherein the punched sheet is provided in a waist-folded shape. 4. A container a with a flange, wherein said deformed fan-shaped portion c is taken out of the container and bent to be axially symmetric. Flanged container.