JP2013166253A - Method of forming curved cardboard - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method of forming a curved cardboard that can curve and form a cardboard in a curved shape with a predetermined curvature, and fix the curved shape by itself.SOLUTION: A plurality of recessed grooves 5 extending in a direction crossing a grain direction are formed on one surface of a piece of cardboard material 1 in which a flute 4 is interposed between liners 2, 3. The plurality of recessed grooves 5 are formed on one surface of another piece of cardboard material 1 in which the flute 4 is interposed between the liners 2, 3 as well. After both of the cardboard materials 1, 1 are bonded, each other, with an adhesive on the surfaces at which the recessed grooves 5 are formed, both of the cardboard materials 1, 1 are interposed between a convex mold frame having a convex surface with the predetermined curvature and a concave mold frame having a concave surface with a curvature corresponding to the convex surface before the adhesive is solidified. The cardboard materials are press-formed in the curved shape with both of the mold frames, and the pressured state is maintained until the adhesive is solidified.

Description

  The present invention relates to a method for forming a curved corrugated cardboard used as, for example, a cardboard partition (partition), a partition or a column forming material for forming a cardboard decorative column in an exhibition hall.

  Conventionally, as a method for forming a curved corrugated cardboard, for example, there is a method described in Patent Document 1 below. One of the methods described in this document is a plurality of methods that extend from one side of the corrugated board material with flutes between the liners to a depth that does not divide the liner on the other side and in a direction intersecting the flow line. In this method, a substantially parallel concave groove is provided, and the corrugated cardboard material is curved so that the concave groove is compressed with one surface side of the corrugated cardboard material facing inward. As another method, a liner on the other side is provided on each side of the corrugated cardboard material, which includes a center liner, a flute provided on both sides of the center liner, and an outer side liner provided on the outer surface of the flute. Is a method in which a plurality of substantially parallel groove grooves extending in a direction intersecting with the flow line are provided, and the corrugated board material is curved so that the groove grooves are compressed.

Japanese Patent Laid-Open No. 2001-287871

  The corrugated cardboard formed by the former method has flexibility by providing a concave groove on one side of the corrugated cardboard material, so it can be freely curved to an arbitrary curvature, but it has a constant curvature by itself. It cannot be fixed in a curved shape. Similarly, the corrugated cardboard formed by the latter method can be curved freely, but cannot be fixed to a certain curved shape by itself, and can be easily deformed if pressed by hand. Therefore, in order to hold the corrugated board material in a certain curved shape, some appropriate curved shape holding means is required.

  In view of the above circumstances, the present invention provides a method for forming a curved corrugated cardboard that can be curved and formed into a curved shape with a required curvature and can be fixed to a certain curved shape by itself. For the purpose.

  Means for solving the above problems will be described with reference numerals in the embodiments described later. In the method for forming a curved corrugated cardboard according to the first aspect of the present invention, the flute 4 is interposed between the liners 2 and 3. A plurality of concave grooves 5 extending in a direction intersecting the flow line or in a direction parallel to the flow line are formed on one side of the corrugated cardboard material 1 (11), and the flute is similarly provided between the liners 2 and 3. A plurality of similar grooved grooves 5 are formed on one surface side of another corrugated cardboard material 1 (11) formed by interposing four corrugated cardboard materials 1 and 11 (11,11). After the surfaces on which the slabs are formed are bonded to each other with the adhesive 6, the corrugated cardboard materials 1, 1 (11, 11) are bonded to the corrugated cardboard members 1 and 11 (11, 11) while the adhesive 6 is not solidified. 7 and a concave mold 8 having a concave surface portion 8a having a curvature corresponding to the convex surface portion 7a. Press-molded into a curved shape by both mold 7,8, the pressurized state is the adhesive 6 and maintains until solidified.

  The effect of the invention by the above solution will be described with reference numerals of embodiments to be described later. According to the invention according to claim 1, a curved corrugated cardboard which can itself be self-supported on a floor surface or the like. A and B can be formed easily and inexpensively, and can be used as they are as partitions, standing signs, and the like. Further, the curved corrugated cardboards A and B formed according to the present invention have a good appearance and appearance because the concave grooves 5 are hidden behind the corrugated cardboard materials 1 and 11 and cannot be seen.

It is a perspective view which shows the curved corrugated cardboard formed by the method of this invention. (a) shows one step of the method for forming a curved corrugated cardboard according to the present invention, and is a perspective view showing both corrugated board materials each having a concave groove formed on one side, and (b) is a diagram of (a) The enlarged view of the part shown by the arrow X, (c) is the YY line expanded sectional view of (b). FIG. 2 shows a pressing step of the curved corrugated cardboard forming method according to the present invention, in which (a) is an explanatory view showing a state in which both corrugated cardboard materials are bonded between the concave and convex molds, and (b) FIG. 6 is an explanatory view showing a state where a corrugated cardboard material is press-formed in a curved shape by using both concavo-convex molds, and (c) is an explanatory view showing the formed curved corrugated cardboard. (a) is the enlarged view of the part shown by the arrow Q of (c) of FIG. 3, (b) is the VV sectional view taken on the line of (a). (a) is a perspective view showing a partition formed by connecting a plurality of curved cardboards, (b) a perspective view showing a decorative pillar formed by connecting a plurality of curved cardboards. (a) is a plan development view of a fan-shaped corrugated cardboard material when forming a conical corrugated cardboard, and (b) is an enlarged cross-sectional view taken along the line WW of (a). (a) is a perspective view showing a curved corrugated cardboard formed by the fan-shaped corrugated cardboard material shown in FIG. 6, and (b) is an enlarged sectional view taken along line ZZ of (a).

  A preferred embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows a curved corrugated board A formed by the method of the present invention. This will be described below with reference to FIG.

  First, as shown in FIG. 2 (a), on one surface side of a corrugated board material 1 having a flute 4 interposed between a pair of liners 2, 3 on both sides, A plurality of concave grooves 5 extending in a direction perpendicular to the flow line) are formed in parallel with each other at a required interval, and another flute 4 is interposed between a pair of liners 2 and 3 on both sides. A plurality of concave grooves 5 similar to the above are formed on one surface side of the corrugated board material 1.

  Next, the corrugated cardboard materials 1 and 1 are bonded together with an adhesive 6 as shown in FIG. 3A from the state where the surfaces on which the concave grooves 5 are formed face each other, and then the adhesive 6 As shown in FIGS. 3 (a) and 3 (b), the corrugated board materials 1 and 1 are made to have a convex frame 7 having a convex part 7a having a required curvature and a curvature corresponding to the convex part 7a. By interposing between the concave mold 8 having the concave surface portion 8a and press-molding in a curved shape by the concave and convex molds 7 and 8, and maintaining the pressure state until the adhesive 6 is solidified, both The corrugated board materials 1 and 1 are fixed to a curved shape having a required curvature. Thereafter, the corrugated boards 7 and 8 are separated from each other, thereby taking out the cardboard A formed in a curved shape having a required curvature as shown in FIG.

  In the method of forming the curved corrugated cardboard A, the corrugated cardboard material 1 is a corrugated cardboard material formed with a flute 4 interposed between a pair of liners 2 and 3 on both sides as shown in FIG. Any type may be used, but a rigid mildan is preferably used.

  A plurality of groove grooves 5 extending in a direction intersecting with the flow line, in this embodiment, in a direction perpendicular to the flow line, are formed on the one side of the corrugated board material 1 in parallel with each other at regular intervals. Here, although not shown, the flow line means a line that appears thinly on the surface side of the liners 2 and 3 when the corrugated paper material forming the flute 4 is attached to the liners 2 and 3. As shown in FIG. 2 (c), the concave groove 5 is cut from the liner 2 on one side of the corrugated board 1 to the flute 4 with a part of the flute 4 adjacent to the liner 3 on the other side remaining. To form.

  In this case, the concave groove 5 may be formed by cutting all the flutes 4 from the liner 2 on the one surface side, or all the flutes 4 from the liner 2 on the one surface side, and further the liner 3 on the other surface side. It may be formed by cutting halfway through. In short, the groove 5 is cut to such a depth that the liner 3 on the other side is not divided (the depth at which the liner 3 on the other side is not completely separated by the groove 5 and cannot be bent). What is necessary is just to form. The concave groove 5 is formed by a grooving device.

  As an adhesive 6 for bonding the corrugated cardboard materials 1 and 1 to each other on the side where the groove 5 is formed, for example, if an adhesive for woodworking is used, the corrugated cardboard materials 1 and 1 are firmly bonded in a short time. Can be made. The adhesive 6 may be applied to either one of the corrugated cardboard materials 1 and 1 on the surface on which the concave groove 5 is formed. You may apply | coat to each surface of the side in which was formed. Further, as the adhesive 6, it is necessary to press-mold both the corrugated cardboard materials 1, 1 with the mold frames 7, 8 while the adhesive 6 does not solidify after the corrugated cardboard materials 1, 1 are bonded. Use one that is not quick-drying.

  Then, as described above, after the corrugated cardboard materials 1 and 1 are bonded with the adhesive 6, the corrugated cardboard materials 1 and 1 are pressed into a curved shape by the concavo-convex molds 7 and 8 while the adhesive 6 is not solidified. However, when the adhesive 6 is solidified, it becomes difficult to deform the curved shape by the both concavo-convex molds 7 and 8, and even if it is deformed into a curved shape, the original flat plate state is obtained. This is because the predetermined curved shape cannot be maintained due to the return.

  That is, if the corrugated cardboard materials 1 and 1 are pressed into a curved shape by the concave and convex molds 7 and 8 while the adhesive 6 is not solidified, as shown in FIG. The corrugated board material 1 on the right side of the drawing has a flow direction extension on the side of the liner 2 on the side in contact with the left corrugated board material 1, and the interval between the groove grooves 5 is widened. Both sides of the concave and convex mold frames 7 and 8 are compressed until the concave groove 5 is compressed on the side liner 3 side in contact with the corrugated board material 1 on the right side, so that each groove 5 is compressed and the adhesive 6 is solidified. By maintaining the pressurized state by the press, both the corrugated board materials 1 and 1 are formed into a curved shape as shown in FIG. 4 (a) by the solidified adhesive 6, and this curved state is maintained as it is. be able to. 4 (b) is a cross-sectional view taken along line VV in FIG. 4 (a). The groove 5 of the corrugated board 1 on the left side of FIGS. 4 (a) and 4 (b) is as described above. In the compressed state, the concave groove 5 of the corrugated board material 1 on the right side is in a state where the interval is widened.

  Further, in the press molding of the corrugated board materials 1 and 1 by the both concave and convex mold frames 7 and 8, the corrugated board materials 1 and 1 are first placed on the lower concave mold frame 8 from the state shown in FIG. After placing, the upper convex frame 7 is lowered by the pressing member 9 as shown in FIG. 5B, and the corrugated board material 1, 1 is moved to the concave surface portion of the concave frame 8 by the convex surface portion 7 a of the convex frame 7. The cardboard materials 1 and 1 are pressed into a curved shape having a required curvature.

  When the convex frame 7 and the concave frame 8 are used, the concave frame 8 may be fixed on the floor, and the convex frame 7 may be connected to a press device such as a hydraulic cylinder (not shown) via the pressing member 9. .

  The curved corrugated cardboard A formed by the method as described above is fixed to the curved shape of the required curvature pressed between the concave and convex surface portions 7a, 8a of the two mold frames 7, 8, and returns to the original flat corrugated cardboard. Therefore, it can be self-supported on the floor or the like as shown in FIG. 1, and can be used as it is as a partition, a partition, a standing signboard, or the like. Further, the curved corrugated cardboard A has a good appearance and appearance because the concave groove 5 is hidden behind the corrugated cardboard material 1 and cannot be seen. The curved corrugated cardboard A has a desired print on the other surface side of each corrugated cardboard material 1, that is, on the outer surface side where the groove 5 is not formed, before the two corrugated cardboard materials 1 and 1 are bonded to each other. Can be applied.

  FIG. 5 shows an example of use of the above-described curved corrugated cardboard A. FIG. 5A shows a plurality of curved corrugated boards A arranged in a row so that the concave and convex sides are alternately reversed (in a plan view wave shape). The case where it is arranged and used as a corrugated partition is shown. In this case, the ends of the corrugated board materials 1 and 1 can be easily connected to each other by fastening the screws 13 in a state in which the connecting tool 12 having an H-shaped cross section is sandwiched between the adjacent ends of the adjacent curved corrugated board materials 1 and 1. Can be linked. Further, if the screw 13 is pulled out and the connector 12 is removed, the cardboard materials 1 can be easily separated from each other, so that they can be stored and stored compactly after use. The connector 12 is made of a metal material such as an aluminum extruded shape or a molded body of synthetic resin.

  FIG. 5B shows a plurality of curved corrugated cardboards A formed in a curved shape having a required curvature, in this case, three curved shapes formed to be divided into three at intervals of 120 ° in the circumferential direction. The case where the corrugated cardboards A, A, A are combined and arranged in a cylindrical shape and used as, for example, a decorative pillar is shown. Also in this case, the end portions of the corrugated boards A and A are easily and easily connected to each other by sandwiching the connecting tool 12 having an H-shaped cross section between the adjacent end portions of the adjacent curved corrugated boards A and A and fastening them with screws 13. If the screws 13 are removed, the cardboard materials 1 can be easily separated from each other, so that they can be stored and stored compactly after use.

  6 and 7 show a method for forming a curved corrugated cardboard B used for forming a conical cylindrical body as shown in FIG. 7 (c). 6A is a developed plan view of the fan-shaped corrugated cardboard material 1 forming the curved corrugated cardboard B, and FIG. 6B is an enlarged sectional view taken along the line WW of FIG. In order to form the curved corrugated cardboard B, first, the corrugated cardboard material 21 is formed of, for example, a vertically long rectangular corrugated cardboard material 21 as shown by an imaginary line in FIG. 21 is formed by cutting out a substantially fan-shaped corrugated cardboard material 11 as shown by the solid line in the figure, and on one surface side of the fan-shaped corrugated cardboard material 11, a concave strip perpendicular to the flow line at the center in the width direction of the corrugated cardboard material 11. A groove 5 is formed (the groove groove at the center is indicated by 5o in particular), and the flow path is directed along the direction from both sides of the groove 5o at the center toward the left and right ends of the fan-shaped corrugated cardboard material 1. A plurality of concave grooves 5 that are gradually obliquely formed are formed at required intervals.

  And after bonding the two same thing of the fan-shaped corrugated cardboard material 11 which formed the grooved groove | channel 5 as mentioned above with the adhesive agent 6 on the side in which the grooved groove | channel 5 was formed, the adhesive agent 6 becomes In the same manner as in the case of the curved corrugated cardboard A shown in FIG. 3, both the fan-shaped corrugated cardboard materials 11 and 11 are solidified without being solidified, and the convex frame 7 having the convex surface portion 7a having the required curvature and the concave surface having the curvature corresponding to the convex surface portion 7a. It is interposed between the concave mold 8 having the portion 8a and press-molded into a curved shape by the concave and convex molds 7 and 8, and is fixed in a conical shape by maintaining the pressure state until the adhesive 6 is solidified. As shown in FIG. 7A, a curved corrugated cardboard B forming a part of a conical cylindrical body is formed. FIG. 7B shows an enlarged longitudinal sectional view taken along the line ZZ of FIG. 7A. The sectional structure of the curved corrugated cardboard B is the curved corrugated cardboard A shown in FIG. Is the same.

  The curved corrugated cardboard B for forming a conical shape formed as described above is such that the conical cylindrical body to be formed is divided into three parts at intervals of 120 ° in the circumferential direction. By combining the three, a conical cylindrical body as shown in FIG. 7 (c) is formed. That is, three curved corrugated boards B, B, and B are opposed to each other at their end portions to form a conical cylindrical body. Also in this case, similarly to the example of use of the curved corrugated cardboard A shown in FIGS. 5A and 5B, the connector 12 having an H-shaped cross section is sandwiched between adjacent end portions and the screw 13 is fixed. The end portions of the corrugated cardboards B, B, B can be easily connected to each other, and if the screws 13 are removed, the curved corrugated cardboards B can be easily separated from each other, and can be stored and stored compactly after use. The conical tubular body formed as shown in FIG. 7 (c) is used as various decorative tubular bodies.

  Moreover, in the formation method of the curved corrugated cardboard A shown in the embodiment of FIGS. 1 to 5, a plurality of concave grooves 5 extending in a direction orthogonal to the flow line are formed on one surface side of each corrugated cardboard material 1, and FIG. In the method for forming the curved corrugated cardboard B shown in the embodiment of FIG. 7, the corrugated groove 5 extending in the direction orthogonal to the flow line is inclined and intersected with the flow line on one surface side of each cardboard material 1. In addition to these embodiments, a plurality of groove grooves 5 extending in a direction parallel to the flow line are formed on one surface side of each corrugated board material 1 in addition to these embodiments. Can also be formed. When the groove 5 is formed in a direction parallel to the flow line as described above, if only one cardboard material 1 is used, the waist of the cardboard material is weakened and the self-supporting property is lost. Are bonded to each other by the adhesive 6 on the side where the groove 5 is formed, and press-molded into a curved shape, so that sufficient rigidity is secured and a self-supporting state is obtained.

A, B Curved corrugated cardboard 1, 11 Corrugated cardboard material 2, 3 Liner 4 Flute 5 Concave groove 6 Adhesive 7 Convex frame 7a Convex part 8 Concave part 8a Concave part

Claims (1)

On one side of a sheet of cardboard material made by interposing a flute between the liner to form a concave groove of the multiple extending in a direction parallel to the direction or flow-th intersecting the flow eyes, also flute between the liner After forming a plurality of groove grooves similar to the above on one surface side of the other corrugated cardboard material, and bonding the corrugated cardboard materials with the adhesive between the surfaces on which the groove grooves are formed, While the adhesive is not solidified, both the corrugated board materials are interposed between a convex mold frame having a convex surface portion having a required curvature and a concave mold frame having a concave surface portion having a curvature corresponding to the convex surface portion, and curved by both mold frames. A method for forming a curved corrugated cardboard, characterized in that the pressed state is maintained until the adhesive is solidified.

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