JP2001287871A - Corrugated board and forming method for curved part by use of corrugated board - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a corrugated board with further excellent rigidity and extremely easily and inexpensively formable into a desired curved part and a forming method of curved part by used of corrugated board. SOLUTION: This corrugated board 1 having a flute part 4 interposed between liners 2 and 3 comprises a plurality of substantially parallel recessed grooves 6 extending from one surface 2a side in the direction orthogonal to a corrugating line 5 at a depth never cutting the liner 3 on the other surface 3a side.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a corrugated cardboard for forming a curved surface portion and a method for forming a curved surface portion using a corrugated cardboard, which are suitable for use in producing a product having a curved surface portion such as a corrugated cardboard bobbin.

[0002]

2. Description of the Related Art Conventionally, a corrugated bobbin has been used for winding a linear, tubular or band-shaped product. The structure of this type of cardboard bobbin is
For example, as shown in Japanese Patent Application Laid-Open No. H11-49436, a single-sided corrugated cardboard that is extremely easy to bend around the flow direction is used, and the cardboard is generally rolled up many times and laminated. It is.

[0003]

However, when a bobbin is manufactured by forming a curved surface portion with corrugated cardboard, for example, high rigidity and roundness may be required depending on the type of a product wound around the bobbin. . In this case, the strength of the single-sided cardboard itself is increased or the layers are laminated, but in order to obtain the required rigidity, the easily curved nature of the single-sided corrugated cardboard increases cost and manufacturing complexity. Has been invited.

An object of the present invention is to provide a corrugated cardboard for forming a curved surface portion and a method for forming a curved surface portion by using a corrugated cardboard, which are excellent in rigidity and can form a desired curved surface portion extremely easily and inexpensively.

[0005]

The object of the present invention is to solve the above-mentioned problem by providing a corrugated cardboard having a flute portion interposed between liners. A corrugated cardboard having a plurality of substantially parallel grooves extending at a depth and extending in a direction intersecting a flow path.

Another object of the present invention is to provide a corrugated cardboard having a flute portion interposed between liners, at a depth from one side of the corrugated cardboard even if the liner on the other side is not divided, and extending in a direction intersecting the flow path. A step of providing a plurality of substantially parallel concave grooves, and a step of bending the corrugated cardboard so that the one surface side is inside and the concave grooves are compressed. This is a method of forming a surface portion.

Further, what solves the above problem is a cardboard having a central liner, flute portions provided on both surfaces of the central liner, and liners provided on the outer surface of the flute portion, respectively. The corrugated cardboard is provided with a plurality of substantially parallel grooves extending from both sides at a depth that does not divide the liner on the other surface even if it is deep, and extends in a direction intersecting the flow path. It is.

[0008] In order to solve the above-mentioned problem, a central liner is provided with flute portions on both surfaces thereof, and a liner is provided on each of the outer surfaces of the flute portion. A step of providing a plurality of substantially parallel concave grooves extending at a depth that does not divide, and extending in a direction intersecting the flow path, and a step of bending the cardboard so that the concave grooves are compressed. This is a method of forming a curved surface portion using corrugated cardboard.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A corrugated cardboard for forming a curved surface portion according to the first invention of the present application will be described first with reference to one embodiment shown in FIGS. As shown in FIGS. 1 and 2, a corrugated cardboard 1 for forming a curved surface portion according to this embodiment is a corrugated cardboard having a flute portion 4 interposed between liners 2 and 3. A plurality of substantially parallel concave grooves 6 are provided at a depth that does not break the liner 3 on the other surface 3 a side at the deepest, and extend in a direction intersecting the flow path 5. Hereinafter, each configuration will be sequentially described in detail.

[0010] Corrugated cardboard 1 for forming a curved surface portion of this embodiment
As shown in FIG. 3, is composed of double-faced cardboard with a flute portion 4 interposed between liners 2 and 3. However, the curved surface portion forming corrugated cardboard of the first invention of the present application is not limited to a double-sided corrugated cardboard, and for example, a laminate of a plurality of double-sided corrugated cardboards, a double-sided corrugated cardboard, and a double-sided corrugated cardboard. It broadly includes those having a corrugated cardboard structure in which a flute portion is interposed between liners, such as those laminated and laminated. Further, the corrugated cardboard 1 for forming a curved surface portion of this embodiment is a paper corrugated cardboard, but the corrugated cardboard of the present invention is not limited to this, and may be a plastic corrugated cardboard.

As shown in FIGS. 1 and 2, the corrugated cardboard 1 extends from one surface 2 a to a depth that does not break the liner 3 on the other surface 3 a at the most and in a direction intersecting the flow path 5. A plurality of substantially parallel concave grooves 6 are provided.

The cardboard according to the first aspect of the present invention has such a concave groove, so that it can be easily curved along a flow path. The curve along the flow means that the flow is curved so as to form an arc. Further, in the present application, the “flow path” refers to a line that appears thin on the surface side of the liner when the corrugated paper material forming the flute portion is attached to the liner. As described in the related art, cardboard is easy to bend around the flow direction, but bending against the flow is usually difficult because it is bending in the direction of bending the flute portion. In the present invention, the provision of the concave groove makes such bending extremely easy.

The concave groove having the above function is formed at a depth from one surface 2a to a depth at which the liner 3 on the other surface 3a is not divided. Note that “not split” in the present application means that the liner on the other side is completely wrapped except when it is completely separated by the concave groove and cannot be bent. In addition to not dividing at the time of the above, it also means not dividing when a desired curved surface portion is formed as shown in FIG. Therefore, it is preferable that the concave groove does not penetrate to the other surface side. However, for example, a groove formed dotted and partially penetrating like a cut line, the concave groove of the present application is also applicable. It is included in the category.

In this embodiment, as shown in FIG. 2, the concave groove 6 is formed by cutting the liner 2 and the flute portion 4 on one surface 2a, and cutting the liner 3 on the other surface 3a. Not. However, only the liner 2 is cut, the liner 2 is cut halfway,
What is cut to the middle of the flute part 4 or what is cut to the middle of the liner 3 may be used.
Widely encompasses a concave groove formed so that the liner on the other side is not divided.

[0015] A plurality of concave grooves are provided to extend substantially parallel to the direction intersecting the flow path. As described above, when the concave groove is provided so as to extend in the direction intersecting the flow path, when the concave groove is lifted and curved in the arrow direction in FIG. 2, the concave groove is compressed and the cross sections shown in FIG. In particular, the cut surfaces of the flute portions 4 abut against each other and are pressed to form a highly rigid curved surface portion. When a plurality of such concave grooves are provided substantially in parallel, the cut surfaces of the flute portions abut against each other and are pressed against each other to form a curved surface part having extremely high rigidity.

In this embodiment, as shown in FIG. 1, the concave groove 6 is provided in a direction perpendicular to the flow path 5. Along with this, the flute portion 4 is also cut in a direction perpendicular to the flow path 5, so when the cut surfaces are curved and pressed against each other, the cut surfaces are compressed along the curved surface portion,
A more rigid curved surface portion is formed. However, the concave groove of the present invention broadly includes a groove provided in a direction intersecting a flow, and a groove provided to extend obliquely to the flow is also included in the scope of the present invention. Is done.

Further, as shown in FIG. 1, the groove 6 of this embodiment is provided so as to cross the corrugated cardboard 1 in a direction crossing the flow channel 5, but compresses the groove 6. If it can be bent in this way, those that do not cross the cardboard are also included in the scope of the present invention. Further, the concave grooves 6 of this embodiment are formed at substantially equal intervals and at the same depth as shown in FIG. 2, which is used when this embodiment forms a perfect circle. This is because, depending on the curved surface portion to be formed, those in which the concave grooves are not formed at equal intervals or are not formed at the same depth are also included in the scope of the present invention. . Further, the interval between the concave grooves is appropriately selected and determined according to the degree of curvature of the curved surface portion to be formed, the strength of the corrugated cardboard used, the wall thickness, and the like.

Next, a method for forming a curved surface portion using a cardboard according to the first invention of the present application will be described. The present invention is an invention of a method for forming a curved surface portion using the above-described corrugated cardboard 1. That is, the method for forming a curved surface portion using corrugated cardboard according to the present invention has a depth such that the liner 3 on the other surface 3a side does not break even from one surface 2a side of the corrugated cardboard 1 in which the flute portion 4 is interposed between the liners 2 and 3. Providing a plurality of substantially parallel concave grooves 6 extending in a direction intersecting the flow path 5;
Curving the corrugated cardboard 1 with the one surface 2a side inward and the concave groove 6 compressed.
Hereinafter, each step will be described.
The same terms and the same expressions are the same, and are denoted by the same reference numerals and will not be described again.

In the step of providing the concave groove, the above-described concave groove is formed on a corrugated cardboard of a required form by using a pressing device or a grooving device. More preferably, it is formed.

In the step of bending the corrugated cardboard 1 with the one surface 2a side inward and the concave groove 6 compressed, both ends of the corrugated cardboard 1 are formed with the one surface 2a side on which the concave groove 6 is formed inward. (Upper and lower ends in FIG. 1), and are lifted in the directions of arrows in FIG. 2 to bend as shown in FIG. Thereby, each concave groove 6 is compressed, and the cut surfaces of the flute portion 4 are pressed against each other, so that a curved surface portion having extremely high rigidity is formed.

Further, a corrugated cardboard bobbin manufactured by using the corrugated cardboard 1 of the first invention of the present application and a method for forming a curved surface portion using the corrugated cardboard 1 will be described with reference to an embodiment 10 shown in FIGS.

The bobbin 10 made of corrugated cardboard according to this embodiment has locking portions 11a, 11b, 11c and locking portions 11a, 11b,
11c, and a cylindrical portion 12 locked to the cylindrical portion 12c.
Is constructed using cardboards 1a and 1b having a flute portion 4 interposed between liners 2 and 3. The cardboards 1a and 1b are provided with a liner 3 on one surface 2a side and the other surface 3a side at the deepest. A plurality of substantially parallel concave grooves 6 are provided at a depth that does not divide and extend in a direction intersecting the flow path 5, and the cylindrical portion 12 compresses the concave grooves 6 with the one surface 2a side inside. In this manner, the cardboards 1a and 1b are each formed by bending. Hereinafter, each component will be described, but the same components are denoted by the same reference numerals, and detailed description thereof will be omitted.

The corrugated cardboard bobbin 10 of this embodiment comprises three locking portions 11a, 11b, 11c and a cylindrical portion 12 shown in FIG. The tubular portion 12 is formed by using the two corrugated boards 1 described above, and as shown in FIG. 5, one corrugated board 1a forms an upper semicircular portion, and the other corrugated board 1 1b forms a lower semicircular portion.

The method of forming the semicircular portion is as shown in FIG. 4. In order to maintain this curved state, the disk-shaped locking portion 11 shown in FIG. 7 is fitted inside the semicircle. In particular,
The slits 8 of the engaging portions 7a, 7b provided at both ends of the cardboards 1a, 1b, and the locking portions 11a, 11b, respectively.
The bobbin 10 made of cardboard is constituted by engaging the slits 13 b and 11 c with each other as shown in FIG.

The cardboard bobbin of the present invention is not limited to the embodiment of the present invention, but broadly encompasses a structure in which the cardboard of the first invention of the present application is held in a cylindrical body. For example, the corrugated bobbin of the present invention is widely used, for example, a corrugated cardboard of the present invention having a tubular portion or a corrugated cardboard of the first invention of the present invention having a locking portion (locking structure). Is included in the category.

FIG. 8 shows a cardboard according to the second invention of the present application.
This will be described using the embodiment shown in FIG. The corrugated cardboard 20 of this embodiment has a central liner 21, flute portions 22, 23 provided on both surfaces of the central liner 21, and liners 24, 25 provided on outer surfaces of the flute portions 22, 23, respectively. The corrugated cardboard 20 has a plurality of substantially parallel concave grooves 6 extending at a depth that does not break the liner 24 or 25 on the other surface 24a or 25a, and extends in a direction intersecting the flow path 5 at the deepest. 2
They are provided from the side of 5a and 24a, respectively.

The basic difference between the cardboard 20 of the second invention of the present application and the above-described cardboard 1 of the first invention is that the cardboard 20 of the second invention of the present application has the concave grooves 6 on both surfaces. The only difference is that, as shown in FIG. 8, any surface can be freely bent. The same terms and the same expressions as those of the above-mentioned corrugated cardboard 1 are the same and will not be described in detail.

That is, the cardboard 20 of the second invention of the present application
When the concave groove 6 on one side 25a or 24a is compressed and curved, the gap is widened in the concave groove 6 on the other surface 24a or 25a, and the rigidity compresses the concave groove 6. The side is secured. For this reason, it is rigid and can be freely bent, and can be applied to various uses, for example, when a backrest portion and a seat portion of a chair are continuously formed.

Since the corrugated cardboard 20 of this embodiment is formed by adhering two double-faced cardboards, the center liner is composed of two liners. And those having the structure of the second invention of the present application, such as those formed by laminating multiple double-faced cardboards. Further, the concave grooves of this embodiment are provided on both surfaces at the same interval, but the present invention is not limited to this. For example, the concave grooves on each surface have different intervals,
Widely encompasses those having concave grooves on both surfaces, such as those having uneven grooves on each surface side and uneven concave grooves at different depths.

Further, in the method of forming a curved surface portion using the cardboard of the second invention of the present application, the center liner 21 is provided with flute portions 22 and 23 on both surfaces thereof, and the outer surfaces of the flute portions 22 and 23 are provided respectively. Liner 24,
From the both sides 24a, 25a side of the cardboard 20 provided with 25, the liners 24, 2 on the other side 24a, 25a side at most
A step of providing a plurality of substantially parallel concave grooves 6 extending in a direction intersecting the flow path 5 at a depth that does not divide the corrugated cardboard 20 on both sides so that the concave grooves 6 are compressed; Curving. The same components as those described above are denoted by the same reference numerals, and description thereof will be omitted.

[0031]

According to the first and second aspects of the present invention, a desired curved surface portion can be formed extremely easily and inexpensively while having higher rigidity. According to the third aspect of the present invention, a corrugated cardboard bobbin having excellent rigidity can be manufactured very easily. According to the fourth and fifth aspects of the invention, the curved surface portions having higher rigidity can be freely formed from both sides.

[Brief description of the drawings]

FIG. 1 is a plan view of an embodiment of a cardboard for forming a curved surface portion according to the first invention of the present application.

FIG. 2 is an enlarged sectional view taken along line AA of FIG.

FIG. 3 is an enlarged vertical cross-sectional view of the corrugated cardboard for forming a curved surface portion shown in FIG. 1 cut along a groove.

FIG. 4 is a perspective view for explaining a bending step, which is one step of the method for forming a curved surface portion using a cardboard according to the first invention of the present application.

FIG. 5 is a perspective view of a bobbin manufactured using the curved surface portion forming cardboard of the present invention shown in FIG.

FIG. 6 is a perspective view for explaining the internal structure of the bobbin shown in FIG.

FIG. 7 is a plan view of a locking portion used in the bobbin shown in FIG.

FIG. 8 is a perspective view of an embodiment of a cardboard for forming a curved surface portion according to the second invention of the present application.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Corrugated cardboard for forming curved surface portion 2 Liner 2a One surface 3 Liner 3a Other surface 4 Flute portion 5 Flow 6 Concave groove 10 Corrugated cardboard bobbin 11 Locking portion 12 Cylindrical portion

Claims (5)

[Claims] 1. A corrugated cardboard having a flute portion interposed between liners, wherein the corrugated cardboard has a depth from one side that does not divide the liner on the other side even if it is deep, and in a direction intersecting the flow path. A corrugated cardboard comprising a plurality of substantially parallel concave grooves extending. 2. A plurality of substantially parallel grooves extending from one side of a corrugated cardboard with a flute portion interposed between liners at a depth such that the liner on the other side is not divided even at a depth, and extending in a direction intersecting the flow path. And a step of bending the corrugated cardboard such that the one surface side is inside and the concave groove is compressed so that the corrugated cardboard is curved. 3. A locking portion and a cylindrical portion locked by the locking portion, wherein the cylindrical portion is formed by using a cardboard having a flute portion interposed between liners, The corrugated cardboard is provided with a plurality of substantially parallel concave grooves extending from one surface to a depth that does not break the liner on the other surface even at the deepest, and extending in a direction intersecting the flow path. Is a corrugated cardboard bobbin formed by bending the corrugated cardboard such that the one surface side is inside and the concave groove is compressed. 4. A corrugated cardboard having a central liner, flute portions provided on both surfaces of the central liner, and liners provided on outer surfaces of the flute portion, respectively. A corrugated cardboard, comprising a plurality of substantially parallel concave grooves extending from the opposite sides at a depth that does not divide the surface side liner and extend in a direction intersecting the flow path. 5. A corrugated cardboard provided with flute portions on both surfaces of a central liner, and liners provided on outer surfaces of the flute portions, at a depth such that the liner on the other surface is not divided at all from both sides, and A step of providing a plurality of substantially parallel concave grooves extending in a direction intersecting the flow path; and a step of bending the corrugated cardboard so that the concave grooves are compressed. Forming method.