How to make variable size wrap-round cartons

Abstract

To provide a carton forming method for a size variable wrap round carton by using a blank suitable for an automatic wrap round type carton forming machine, capable of changing the height of a carton without changing the model.SOLUTION: A carton forming method for a size variable wrap round carton assembled and formed by an automatic wrap round type carton forming machine is characterized in that a supplied blank is formed into a hexahedron by sequentially assembling the same in order in the steps of folding small flaps the number of which depends on a size, raising an inner flap according to a size, folding the small flap that is not folded in the small flap folding mentioned above, folding the inner flap, raising an outer flap, and folding the outer flap and sealing a top surface.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a method for manufacturing cartons compatible with wrap-around type automatic carton making machines, and in particular to a method for making size-adjustable wrap-around cartons that can change and produce different carton sizes without the need for setup changes such as type changes or product type changes. [Background technology]

[0002] Generally, a carton is a paper packaging material, and is in widespread use and is made by assembling blanks made of paperboard or corrugated cardboard, for example, into a three-dimensional box-shaped container capable of storing contents.

[0003] In particular, the wrap-around method, which encloses the contents from all sides to create a box and then seals it, is highly productive and has been put to practical use as an automatic carton-making machine and is common. Among them, when using blanks called the Yakko type (Tato type), it is particularly suitable for packaging thin products.

[0004] Patent Document 1 proposes a carton whose size can be changed. However, although the proposed content allows for size changes, there are size limitations, and since there are no flaps, there is a risk of insufficient strength, and the carton cannot be used with wrap-around type automatic box-making machines, so its applications are limited. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Utility Model Application Publication No. 3-035019 Summary of the Invention [Problem to be solved by the invention]

[0006] The present invention has been made in consideration of the above-mentioned circumstances, and its objective is to provide a method for making adjustable-size wrap-around cartons that uses blanks that are suitable for wrap-around type automatic carton making machines and that allows the carton height to be changed without changing the shape. [Means for solving the problem]

[0007] As a means for solving the above problem, the invention described in claim 1 is: A method for forming a variable size wrap-around carton which is assembled and formed by an automatic wrap-around type carton forming machine, comprising the steps of: The carton formed is a hexahedron consisting of a total of six sides: a rectangular bottom, four sides of the body, and a rectangular top. The carton blank is made of a flat material and is formed with a square outer periphery. The blank has a rectangular bottom surface of the carton disposed in the center of the square, The four sides of the rectangular base face directly opposite the four corners of the square, Four rectangular flaps that form the four sides of the hexahedral body are formed continuously from the four sides of the rectangular base via fold lines, Further outward from these four rectangular flaps are two inner flaps and two outer flaps that can be folded to form a rectangular top surface. The inner flap is an isosceles triangle that is continuous with the two rectangular flaps on the short sides of the rectangular base and has right-angled vertices at the corners of the square. The outer flap is continuous with the two rectangular flaps on the long sides of the rectangular base and is attached to the square A trapezoid is an isosceles triangle with a right-angled vertex at the corner, with the right-angled vertex cut off. The four rectangular flaps forming the four faces of the hexahedral body have a plurality of fold lines parallel to the fold lines of the four sides of the bottom face of the connected rectangle provided on each rectangular flap; In addition, the distances of the plurality of fold lines from the fold lines of the four sides of the rectangular bottom surface are set equal on the four rectangular flaps, In the box-making process, any one of the plurality of fold lines can be selected and folded inward to form a rectangular top surface, Among the four rectangular flaps forming the four faces of the hexahedral body, a pair of opposing flaps continuing to the bottom face of the rectangle each have a small flap provided continuously through the fold line at both side ends of a rectangle surrounded by the plurality of fold lines and the ends of the flap, Among the small flaps, the tip of the outermost small flap is provided on the same line as the outer periphery of the square or on the inside thereof, The length of the short side of the rectangular bottom is b, and the distance from the fold line closest to the long side of the rectangular bottom of the flap that is continuous with the long side of the rectangular bottom to the top side of the trapezoid of the outer flap is a. a≦b And, The blanks supplied in this form are - Fold small flaps according to size, -Inner flap can be raised to fit the size. - Small flap folds that were not folded in the small flap folds, -Inner flap fold-in, · Raise the outer flap, - Folding the outer flap and sealing the top, This is a method for making a size-adjustable wrap-around carton, characterized in that the boxes are assembled in the above order to form a hexahedral box. Effect of the Invention

[0008] According to the present invention, it is possible to provide a method for making adjustable-size wrap-around cartons, which uses blanks that are suitable for wrap-around type automatic carton making machines and allows the carton height to be changed without changing the shape.

[0009] In other words, the blank is made of a flat material and is formed with a square as the outermost circumference, with the rectangular bottom of the carton positioned in the center of the square, and the four sides of the rectangular bottom each face directly opposite the four corners of the outermost square.As a result, when the flaps are folded inward to form the rectangular top when the blank is made into a carton, the four corners of the square are folded against each other and butted together, resulting in a more aesthetically pleasing appearance.

[0010] Furthermore, a blank having a square outermost periphery can reduce material loss during formation of the blank.

[0011] In addition, the flaps capable of forming the rectangular top surface are formed continuously as two inner flaps and two outer flaps capable of forming the top surface further outboard from the four rectangular flaps that form the body of the blank, and the inner flaps are continuous with the two rectangular flaps on the shorter side of the rectangular base surface, forming an isosceles triangle with the corners of the square as right-angled vertices.

[0012] The outer flap is a trapezoid that is connected to the two rectangular flaps on the long side of the rectangular base and has a right-angled vertex cut off from an isosceles triangle with the corner of the square as the right angle vertex, forming a hexahedron. These four rectangular flaps that form the four sides of the body of the carton have a plurality of fold lines that are parallel to and equidistant from the fold lines of the four sides of the bottom of the rectangle they are connected to, so that when folding the inner and outer flaps to form the rectangular top of the carton during carton manufacturing, one of the fold lines can be selected and folded to selectively determine the height of the body of the carton to be manufactured. In other words, the present invention can provide a carton manufacturing method that allows different cartons to be manufactured to preset heights.

[0013] Therefore, the present invention is a method for making variable-size wrap-around cartons that allows size changes without changing the type or product type in a wrap-around type automatic carton making machine.

[0014] This can be used, for example, as a packaging container for storing contents of the same size but with different numbers. In other words, the difference in the number of contents can be accommodated by changing only the height of the carton. Therefore, the method of manufacturing a size-adjustable wrap-around carton according to the present invention makes it possible to accommodate small lots and a wide variety of products.

[0015] Furthermore, of the four rectangular flaps that form the four sides of the hexahedral body, a pair of flaps have small flaps that are continuous with each other via fold lines at both side edges of the rectangle surrounded by multiple parallel fold lines and the sides of the flaps. This makes it possible for the vertical ridges at the four corners of the body of a hexahedral carton made according to the present invention to be sealed, and is also effective in increasing the mechanical strength of the hexahedron.

[0016] In addition, the tip of the outermost small flap of the blank is located on the same line as the outer periphery of the square or on the inside, which allows the wrap-around method to be carried out smoothly without interfering with automatic box making. In addition, because the outermost periphery of the blank is square, it is possible to reduce the loss of blank material when punching out the blank.

[0017] When the length of the short side of the bottom of the rectangle is b, and the distance from the fold line closest to the long side of the bottom of the rectangle among the multiple fold lines of the flap that are continuous with the long side of the bottom of the rectangle and are parallel to the long side, to the top side of the trapezoid, is a, a≦b This makes it possible to form the carton top without the tips of the flaps protruding from the opposing ridges of the top even when the outer flaps capable of forming a rectangular top are folded inward to form the carton top.

[0018] In addition, the supplied blanks are - Fold small flaps according to size, -Inner flap can be raised to fit the size. - Small flap folds that were not folded in the small flap folds, -Inner flap fold-in, · Raise the outer flap, - Folding the outer flap and sealing the top, By adopting a method of assembling and forming a carton in the above-mentioned steps in sequence, it is possible to provide a method of forming a size-adjustable wrap-around carton in which blanks suitable for a wrap-around type automatic carton forming machine are used and the height of the carton can be changed without changing the shape. [Brief description of the drawings]

[0019] [Figure 1] FIG. 1 is a schematic plan view of a blank for explaining one embodiment of a blank used in a method for forming a size-adjustable wrap-around carton according to the present invention. [Diagram 2] FIG. 2 is a schematic plan view of a blank for explaining each part constituting the blank in one embodiment of the blank used in the method for forming a size-adjustable wrap-around carton according to the present invention. [Diagram 3] FIG. 3 is a schematic plan view of a blank for illustrating details of a flap constituting the blank in one embodiment of the blank used in the method for forming a size-adjustable wrap-around carton according to the present invention. [Figure 4] FIG. 4 is a schematic plan view of a blank for illustrating the small flap portion in more detail in one embodiment of the blank used in the method for forming a size-variable wrap-around carton according to the present invention. [Diagram 5] FIG. 5 is a schematic perspective view of a blank before assembly, for illustrating how the blank used in the box-making method for a size-adjustable wrap-around carton according to the present invention is assembled. [Figure 6]FIG. 6 is a schematic perspective view showing folding of minor flaps in a number appropriate to the size, for illustrating the assembly of a blank used in the method for manufacturing a size-adjustable wrap-around carton according to the present invention. [Figure 7] FIG. 7 is a schematic perspective view showing inner flaps raised according to size, for illustrating a state in which blanks used in the method for manufacturing a size-adjustable wrap-around carton according to the present invention are assembled. [Figure 8] FIG. 8 is a schematic perspective view showing the folding of the minor flap that was not folded in step (1), for illustrating the assembly of a blank used in the method for manufacturing a size-adjustable wrap-around carton according to the present invention. [Figure 9] FIG. 9 is a perspective schematic diagram showing folding of inner flaps, for illustrating a state in which a blank used in the box-making method for a size-adjustable wrap-around carton according to the present invention is assembled. [Figure 10] FIG. 10 is a schematic perspective view showing outer flaps being raised, for explaining a state in which a blank used in the method for manufacturing a size-adjustable wrap-around carton according to the present invention is assembled. [Figure 11] FIG. 11 is a schematic perspective view showing sealing of the top surface, illustrating the assembly of blanks used in the method for producing a size-adjustable wrap-around carton according to the present invention. [Figure 12] FIG. 12 is a schematic perspective view illustrating how the carton is folded to a high height and at the third crease in the method for producing a size-adjustable wrap-around carton according to the present invention. [Figure 13] FIG. 13 is a schematic perspective view illustrating a state in which the carton is folded at the second level of the fold line to set it at the middle height in the method for producing a size-adjustable wrap-around carton according to the present invention. [Figure 14] FIG. 14 is a schematic perspective view illustrating how the height of the carton is reduced and the carton is folded at the first level of the fold line in the method for producing a size-adjustable wrap-around carton according to the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0020] The present invention will be described in more detail below with reference to Figs. 1 to 14. However, the present invention is not limited to the examples shown here. The present invention is defined by the claims.

[0021] FIG. 1 is a schematic plan view of a blank for explaining one embodiment of a blank used in a method for forming a size-adjustable wrap-around carton according to the present invention.

[0022] The blank (100) used in the present invention is a carton that is assembled by an automatic box-making machine using a wrap-around method, and the carton formed by this is a hexahedron. .

[0023] The six sides are a rectangular bottom, four sides of the body, and a rectangular top, and the blank (100) is made of flat materials such as paperboard, cardboard, etc. In this specification, the term carton includes boxes made of paperboard, cardboard, etc.

[0024] Cartons assembled and made using the wrap-around method are widely used as product packaging containers in a variety of fields, including beverages, processed foods, and daily necessities. In other words, a blank (100) made of paperboard, corrugated cardboard, or the like is made into a box by wrapping the contents from all sides in a dedicated wrap-around automatic box-making machine, and the box is assembled into a three-dimensional shape by folding along the creases and folding in the flaps, and then glued to make the box automatically.

[0025] The present invention proposes a method for forming blanks (100) using an automatic wrap-around type carton forming machine, and aims to provide a method for forming size-adjustable wrap-around cartons that can form cartons of different heights without changing the shape.

[0026] The example of the blank shown in Fig. 1 is formed with a square (90) as the outermost periphery, with flaps formed from the center on all four sides, and is of a shape also called a "Yacko" type. As mentioned above, the blank (100) can be made of paperboard, cardboard, etc.

[0027] The blank (100) has the part that will become the rectangular bottom (10) of the carton located in the center of the outermost square (90), with the four sides of the rectangular bottom (10) directly facing the four corners of the outermost square (90).

[0028] The bottom surface (10) of the rectangle is the rectangular portion surrounded by creases (50), (51), (52), and (53). As can be seen from the example shown in Figure 1, the short sides of the rectangle are creases (50) and (51), and the long sides of the rectangle are creases (52) and (53).

[0029] Four flaps of the hexahedral body are formed from the four sides of the rectangular bottom surface (10), and contiguous to the four flaps on the outside are formed to form a rectangular top surface. These are connected to the rectangular bottom surface (10) via creases (50), (51), (52), and (53).

[0030] In the example shown in Fig. 1, the rectangular flaps on the four sides of the hexahedral body are meshed rectangular parts. The method for making a size-adjustable wrap-around carton according to the present invention is intended to make it possible to make cartons of different heights in a wrap-around type automatic carton making machine without changing the type or shape by providing multiple fold lines in advance on the rectangular flaps on the four sides of the hexahedral body and folding them selectively.

[0031] FIG. 2 is a schematic plan view of a blank for explaining each part constituting the blank in one embodiment of the blank used in the method for forming a size-adjustable wrap-around carton according to the present invention.

[0032] As described above, the blank (100) has the rectangular bottom surface (10) of the carton located in the center of the square (90), and the four sides of the rectangular bottom surface (10) directly face the four corners of the outermost square (90). , the four corners of the square (90) are shown positioned top, bottom, left, and right.

[0033] Four flaps, namely rectangular flap (20), rectangular flap (21), rectangular flap (22), and rectangular flap (23), which form the four faces of the hexahedral body, are formed continuously from the four sides of the rectangular bottom (10) via four fold lines that form the rectangular bottom (10).

[0034] In the example shown in FIG. 2, the rectangular flaps that form the four sides of the hexahedral body are meshed at four locations.

[0035] That is, the rectangular flap (20) is continuous with the rectangular bottom surface (10) via the fold line (50).

[0036] Similarly, the rectangular flap (21) is continuous with the rectangular bottom surface (10) via a fold line (51).

[0037] Similarly, the rectangular flap (22) is continuous with the rectangular bottom surface (10) via a fold line (52).

[0038] Similarly, the rectangular flap (23) is continuous with the rectangular bottom surface (10) via a fold line (53).

[0039] Furthermore, continuing from the four rectangular flaps that form the four sides of the hexahedral body are four flaps that can be folded inward from all four sides to form a rectangular top surface.

[0040] That is, the rectangular flap (20) is continuous with the inner flap (30) capable of forming a rectangular top surface.

[0041] Similarly, an inner flap (31) capable of forming a rectangular top surface is continuous with the rectangular flap (21).

[0042] Similarly, an outer flap (32) capable of forming a rectangular top surface is continuous with the rectangular flap (22).

[0043] Similarly, an outer flap (33) capable of forming a rectangular top surface is continuous with the rectangular flap (23).

[0044] The four outer flaps capable of forming a rectangular top surface can be folded inward from all four sides to form a rectangular top surface when a box is made using a wrap-around type automatic box making machine.

[0045] The four flaps capable of forming a rectangular top surface are the inner flap (30) capable of forming the top surface on the short side of the rectangular base surface (10), and the two inner flaps (31) capable of forming the top surface are isosceles triangles with right-angled vertices at the top and bottom corners of the outermost square (90).

[0046] In addition, the outer flap (32) capable of forming a rectangular top surface on the long side of the rectangular base surface (10), and the two outer flaps (33) capable of forming a rectangular top surface, are trapezoids formed by cutting off the right-angled vertices of an isosceles triangle, with the left and right corners of the outermost square (90) as right-angled vertices.

[0047] Cutting off these right-angled vertices is effective in preventing the right-angled vertices of the corners of the outermost squares (90) from protruding beyond the opposing edges of the rectangular top surface when the blank (100) is assembled into a box to form the top surface of a rectangle; the dimensional specifications will be described later when explaining Figure 4.

[0048] In the example shown in FIG. 2, of the four rectangular flaps forming the four faces of the hexahedral body, a pair of flaps on the shorter sides have small flaps (40) provided continuously via the fold lines at both ends of a rectangle surrounded by multiple fold lines and the sides of the flaps.

[0049] In addition, the example shown in Figure 2 is an example in which a rectangular flap (20) connected to the short side of the rectangular bottom surface (10) and small flaps (40) are provided at both ends of the rectangular flap (21) opposite it.

[0050] In the example shown in FIG. 2, three small flaps (40) are provided on each side.

[0051] The small flaps (40) are effective in sealing the four vertical ridges of the hexahedral body of the assembled carton, and are also effective in increasing the mechanical strength of the hexahedral body.

[0052] FIG. 3 is a schematic plan view of a blank for illustrating details of a flap constituting the blank in one embodiment of the blank used in the method for forming a size-adjustable wrap-around carton according to the present invention.

[0053] The four rectangular flaps forming the four faces of the hexahedral body have a plurality of fold lines parallel to and equidistant from the fold lines of the four sides forming the bottom surface (10) of the connected rectangle on each rectangular flap. In the example shown in Fig. 3, each flap has three fold lines.

[0054] In the example shown in FIG. 3, the rectangular flaps on the four sides of the hexahedral body are the four rectangular meshed parts.

[0055] The fold lines on the four sides surrounding the rectangular bottom surface (10) are boundary lines between the flaps to be connected, and there are four fold lines: fold line (50), fold line (51), fold line (52), and fold line (53).

[0056] That is, the rectangular flap (20) on the short side has three fold lines, namely, fold line (60), fold line (70), and fold line (80), in that order from the side closest to the rectangular bottom surface (10).

[0057] Similarly, the rectangular flap (21) on the opposing short side has three fold lines, namely, a fold line (61), a fold line (71), and a fold line (81), in that order from the side closest to the rectangular bottom surface (10).

[0058] The rectangular flap (22) on the long side has three fold lines, namely, a fold line (62), a fold line (72), and a fold line (82), in that order from the side closest to the rectangular bottom surface (10).

[0059] Similarly, the rectangular flap (23) on the opposing longer side has three fold lines, namely, fold line (63), fold line (73), and fold line (83), in that order from the side closest to the rectangular bottom surface (10).

[0060] These flaps have multiple fold lines, and when the flaps are folded to form the top surface in the carton making process, one of the fold lines is selected and folded, thereby making it possible to selectively determine the height of the carton to be made.

[0061] In the example shown in FIG. 3, each rectangular flap has three fold lines, so cartons of different heights can be produced by selecting which fold lines to fold.

[0062] In other words, the method of making size-adjustable wrap-around cartons according to the present invention aims to make it possible to make cartons of different heights using an automatic wrap-around carton making machine without changing shapes by pre-creating multiple fold lines on the flaps on all four sides of the hexahedral body.

[0063] Therefore, according to the present invention, the size can be changed by selectively folding multiple fold lines. When three fold lines are provided on the four flaps of the body as shown here, it is possible to produce cartons of three different sizes.

[0064] FIG. 4 is a schematic plan view of a blank for illustrating the small flap portion in more detail in one embodiment of the blank used in the method for forming a size-variable wrap-around carton according to the present invention.

[0065] In the example of the blank shown in Figure 4, of the four rectangular flaps forming the four faces of the hexahedral body, a pair of opposing flaps have small flaps (40) provided continuously on both side ends of a rectangle surrounded by multiple parallel fold lines and the sides of the flaps, via the fold lines.

[0066] In the example shown in FIG. 4, the four rectangular flaps forming the four faces of the hexahedral body are rectangular portions that are shaded, similarly to FIGS.

[0067] In addition, the example shown in Figure 4 is an example in which a rectangular flap (20) connected to the short side of the rectangular bottom surface (10) and a small flap (40) are provided at both ends of the rectangular flap (21) opposite it.

[0068] In the example shown in Fig. 4, three small flaps 40 are provided on each side. As described above, the small flaps 40 are effective in sealing the four vertical ridges of the six-sided body during box making, and are also effective in increasing the mechanical strength of the six-sided carton.

[0069] The size-adjustable wrap-around carton blank (100) used in the present invention must be suitable for use with an automatic box-making machine using the wrap-around method. Therefore, as shown in Figure 4, the tip of the outermost small flap (40) among the small flaps (40) must be on the same line as the outermost square periphery or be on the inside thereof, so that automatic box-making can be carried out smoothly using the wrap-around method without interfering with it.

[0070] In addition, since the outermost periphery of the blank (100) is a square (90), it is possible to reduce loss of material of the blank (100) when forming the blank (100).

[0071] In addition, in the blank for a size-adjustable wrap-around carton according to the present invention, as shown in FIG. 4, the length of the short side of the rectangular bottom surface (10) is b, and the length of the long side of the rectangular bottom surface (10) is Among the multiple fold lines of the consecutive flaps that are parallel to the long sides, the distance from the fold line closest to the long side of the rectangular bottom surface (10) to the top side of the trapezoid is a. a≦b It is.

[0072] As can be seen in the example shown in FIG. 4, the length (b) of the short side of the rectangular base (10) is the distance between fold line (52) and fold line (53), and the distance (a) to the top side of the trapezoid is the distance between fold line (63) and the top side of the trapezoid of the outer flap (33) that can form the top surface of the rectangle.

[0073] Similarly, the distance (a) to the top side of the trapezoid is also the distance from the fold line (62) to the top side of the trapezoid of the outer flap (32) that can form a rectangular top surface.

[0074] Since the distance (a) to the top side of the trapezoid and the length (b) of the short side of the rectangular base (10) are in this relationship, when forming the rectangular top surface of the carton, even when the outer flap (32) capable of forming the top surface and the outer flap (33) capable of forming the top surface are folded inward, the top surface is formed without the tips of the flaps protruding from the ridges of the opposing long sides of the rectangular top surface, making it possible to form the carton using a wrap-around type automatic box-making machine.

[0075] Therefore, even when the flap is folded along the fold lines (63) and (62) among the multiple fold lines, and the distance (a) to the top side of the trapezoid is maximized, it is possible to form the top surface without protruding from the ridges of the opposing long sides of the rectangular top surface.

[0076] FIG. 5 is a schematic perspective view of a blank before assembly, for illustrating how the blank used in the box-making method for a size-adjustable wrap-around carton according to the present invention is assembled.

[0077] The blank (100) has the part that will become the rectangular bottom (10) of the carton located in the center of the square (90), and the four sides of the rectangular bottom (10) each face directly opposite the four corners of the outermost square (90).

[0078] The rectangular bottom surface (10) is the portion surrounded by creases (50), (51), (52), and (53). As can be seen from the example shown in Figure 5, the long sides of the rectangular bottom surface (10) are creases (52) and (53), and the short sides of the rectangular bottom surface (10) are creases (50) and (51).

[0079] Rectangular flaps that form the four sides of the hexahedral body and a rectangular top surface are formed continuously from the four sides of the rectangular bottom surface (10), and these are connected via fold lines (50), (51), (52), and (53).

[0080] The method for making a size-adjustable wrap-around carton according to the present invention proposes an optimal method for making a box by successively folding flaps around the rectangular bottom surface (10) so as to enclose the contents, with the rectangular bottom surface (10) at the center. In other words, this method for making a size-adjustable wrap-around carton can make cartons of different heights without changing the shape.

[0081] FIG. 6 is a schematic perspective view showing folding of minor flaps in a number appropriate to the size, for illustrating the assembly of a blank used in the method for manufacturing a size-adjustable wrap-around carton according to the present invention.

[0082] The assembly of the blank (100) begins with folding the small flaps (40) of the supplied blank (100). The number of small flaps (40) is folded according to the size of the carton to be assembled, and in the example shown in Figure 6, two of the three small flaps on each side are folded from the outside. This folding is indicated by two arrows near the small flaps (40) in Figure 6.

[0083] In the present invention, the size of the carton is variable and it is possible to produce different heights for the rectangular bottom (10) and rectangular top. In the example shown in FIG. 6, the carton height is adjustable to three levels, and is made to the lowest level.

[0084] Which fold lines to select to create cartons of different sizes will be explained later in Figures 12 to 14, but this is the process of folding in the other small flaps, leaving only the small flaps at both ends of the part that will become the four body sides of the carton when it is made.

[0085] In the example shown in Figure 6, only the small flaps at both ends of the rectangle near the rectangular bottom (10) remain, and the other small flaps are folded in. In this case, the width of the remaining small flap determines the height of the body of the carton on all four sides. In the example shown in Figure 6, since there is only one small flap, this is an example of making a carton with a low height among the variable heights.

[0086] FIG. 7 is a schematic perspective view showing inner flaps raised according to size, for illustrating a state in which blanks used in the method for manufacturing a size-adjustable wrap-around carton according to the present invention are assembled.

[0087] The next step is to raise the inner flap to fit the size, which is the work of raising the flap that connects to the short side of the bottom of the rectangle. The flap is raised in the direction of the thick arrow in the figure.

[0088] The rectangular flap (20) on the short side has three fold lines (60), (70), and (80) provided in that order from the side closest to the rectangular bottom surface (10), and in the example shown in Figure 7, the work involves folding the flap upward at fold line (60). This fold line (60) forms the ridge line on the short side of the rectangular top surface when the carton is completed.

[0089] The other rectangular flap (21) on the short side has three fold lines (61), (71), and (81) provided in that order from the side closest to the rectangular bottom surface (10), and in the example shown in Figure 7, the flap is folded upward along fold line (61). This fold line (61) forms the ridge line on the short side of the rectangular top surface when the carton is completed.

[0090] FIG. 8 is a schematic perspective view showing the folding of the minor flap that was not folded in step (1), for illustrating the assembly of a blank used in the method for manufacturing a size-adjustable wrap-around carton according to the present invention.

[0091] The next step in the assembly of the blank is a perspective schematic diagram showing the folding of the minor flap that was not folded in the step shown in FIG.

[0092] As described above, the example shown here is an example in which the fold lines (60) and (61) are selected to raise the inner flaps upward. At this point, the small flaps that were not folded in the process shown in FIG. 6 are folded upward, so that the small flaps overlap each other in this portion.

[0093] By putting the box in this state, the two inner flaps are folded inward in the wrap-around box-making process, preparing to form a rectangular top surface from the short sides.

[0094] FIG. 9 is a perspective schematic diagram showing folding of inner flaps, for illustrating a state in which a blank used in the box-making method for a size-adjustable wrap-around carton according to the present invention is assembled.

[0095] The next step in assembling the blank is folding in the inner flaps, as indicated by the thick arrows in the figure. That is, the inner flaps are further folded from the state shown in Figure 8 along fold lines (50) and (51) to form a rectangular top surface from the short side. However, fold line (50) is hidden by the rectangular flap on the other side in Figure 9 and is not visible.

[0096] In addition, in the state shown in Figures 7 and 8, the portion of the inner flap folded along fold lines (60) and (61) forms the ridge line on the short side of the rectangular top surface in the state shown in Figure 9.

[0097] FIG. 10 is a schematic perspective view showing outer flaps being raised, for explaining a state in which a blank used in the method for manufacturing a size-adjustable wrap-around carton according to the present invention is assembled.

[0098] The next step in the blank assembly is to raise the outer flaps 32 and 33. In this step, the outer flaps 32 and 33 are raised in the directions of the thick arrows along the fold lines 52 and 53.

[0099] By achieving this state, in wrap-around box making, the outer flaps are folded in and the rectangular top surface is formed from the long side, preparing to complete the rectangular top surface.

[0100] FIG. 11 is a schematic perspective view showing sealing of the top surface, illustrating the assembly of blanks used in the method for producing a size-adjustable wrap-around carton according to the present invention.

[0101] The next step in the blank assembly is to fold in the outer flaps and seal the top, completing the wrap-around assembly and box-making. In the state shown in Figure 11, the two outer flaps are folded in along the creases (62) and (63), and they fold over the long sides of the rectangular top, covering the top and completing the rectangular top together with the two inner flaps that were folded in earlier.

[0102] The rectangular top surface thus formed is sealed to hermetically seal the carton (101). There are no particular restrictions on the sealing method, and it can be selected appropriately depending on the contents and use of the carton (101). For example, a method such as gluing may be used.

[0103] The height of the carton (101) at this time is indicated by height (h) in Fig. 11 and is the distance between fold line (53) and fold line (63). That is, the carton (101) is assembled to a low height by folding at the first fold line among the multiple fold lines provided on the rectangular flap.

[0104] In the present invention, when the length of the short side of the bottom of the rectangle is b, and the distance from the fold line closest to the long side of the bottom of the rectangle among the multiple fold lines of the flap that are continuous with the long side of the bottom of the rectangle and are parallel to the long side, to the top side of the trapezoid is a, the relationship between the distance (a) to the top side of the trapezoid and the length (b) of the short side is as follows: a≦b By this, when forming the rectangular top surface of the carton, the outer periphery capable of forming the rectangular top surface can be easily formed. Even when the flap 32 and the outer flap 33 are folded inward, the tips of the outer flaps do not extend beyond the opposing ridges of the rectangular top surface of the carton 101, making it possible to manufacture the carton 101. This can be seen in Figure 11 from the shape of the rectangular top surface of the carton 101.

[0105] FIG. 12 is a schematic perspective view illustrating a state in which a blank for a size-adjustable wrap-around carton according to one embodiment of the present invention is assembled by folding the carton to a high height at the third fold line.

[0106] The example shown in Figure 12 is an example of assembling a carton to a higher variable height, in which the triangular inner flap (30) capable of forming a top surface is folded in at the fold line (80), and the triangular inner flap (31) capable of forming a top surface is folded in at the fold line (81).

[0107] Furthermore, the trapezoidal outer flap (32) capable of forming the top surface is folded in along the fold line (82), and the outer flap (33) capable of forming the top surface is folded in along the fold line (83). By folding the four flaps inward in this manner, a rectangular top surface of the carton (101) can be formed.

[0108] That is, the rectangular top surface of the carton (101) is formed by four flaps folded inward from all four sides, and the carton is sealed.

[0109] The height of the carton (101) at this time is indicated by height (h) in Fig. 12 and is the distance between crease (53) and crease (83). That is, of the multiple creases provided on the rectangular flaps, the carton (101) is assembled to be tall by folding along the third outermost crease, i.e., crease (80) and crease (81) on the inner flap, and along crease (82) and crease (83) on the outer flap.

[0110] Therefore, in this case, in one embodiment of the blank for a size-variable wrap-around carton, it is possible to form a carton (101) having the highest height (h) among three variable height stages.

[0111] FIG. 13 is a schematic perspective view illustrating one embodiment of a blank for a size-variable wrap-around carton according to the present invention, illustrating how the carton is assembled by folding it to the middle height at the second fold line.

[0112] The example shown in Figure 13 is an example of assembling a carton with a medium variable height, in which the triangular inner flap (30) capable of forming a top surface is folded in at the fold line (70), and the triangular inner flap (31) capable of forming a top surface is folded in at the fold line (71).

[0113] Furthermore, the trapezoidal outer flap (32) capable of forming the top surface is folded in along the crease (72), and the outer flap (33) capable of forming the top surface is folded in along the crease (73). By folding the four flaps inward in this manner, a rectangular top surface of the carton can be formed.

[0114] That is, the rectangular top surface of the carton (101) is formed by four flaps folded inward from all four sides, and the carton is sealed.

[0115] The height of the carton (101) at this time is shown as height (h) in FIG. The distance between the crease (53) and the crease (73) is the distance between the crease (53) and the crease (73). That is, of the multiple creases provided on the rectangular flaps, the second row in the middle of the creases, i.e., the inner flap is folded at the crease (70) and the crease (71), and the outer flap is folded at the crease (72) and the crease (73), to assemble the carton (101) at a medium height.

[0116] Therefore, in this case, in one embodiment of the blank for a size-variable wrap-around carton, it is possible to form a carton (101) having a medium height (h) among the three stages.

[0117] FIG. 14 is a schematic perspective view illustrating a state in which a blank for a size-variable wrap-around carton according to one embodiment of the present invention is assembled by folding the carton to a low height at the first fold line.

[0118] The example shown in Figure 14 is an example in which the carton is assembled to a high variable height by folding in the triangular inner flap (30) that can form a top surface along the fold line (60), and folding in the triangular inner flap (31) that can form a top surface along the fold line (61).

[0119] Furthermore, the trapezoidal outer flap (32) capable of forming the top surface is folded in along the fold line (62), and the outer flap (33) capable of forming the top surface is folded in along the fold line (63). By folding the four flaps inward in this manner, a rectangular top surface of the carton can be formed.

[0120] That is, the rectangular top surface of the carton (101) is formed by four flaps folded inward from all four sides, and the carton is sealed.

[0121] The height of the carton (101) at this time is indicated by height (h) in Fig. 14 and is the distance between crease (53) and crease (63). That is, of the multiple creases provided on the rectangular flaps, the first crease, i.e., the inner flap is folded along creases (60) and (61), and the outer flap is folded along creases (62) and (63), resulting in the carton (101) being assembled with the lowest height.

[0122] Thus, in this case, in one embodiment of a variable size wrap-around carton blank, it is possible to form a carton (101) having the lowest height (h) of the three stages.

[0123] In this way, according to the present invention, it is possible to produce cartons (101) having three different heights as shown in Figs. 12 to 14 using the same blank without changing the shape.

[0124] A carton formed using a size-variable wrap-around carton blank can be used, for example, when storing contents of the same size but in different numbers.

[0125] To give a specific example, in the case of a carton for storing medicinal patches, it is possible to realize a method of manufacturing cartons that correspond to product variations, such as 2 bags (40 bags), 4 bags (80 bags), or 6 bags (120 bags) containing 20 pillow bags, without changing the type or shape.

[0126] In other words, in the past, when manufacturing cartons of different sizes, it was necessary to change the product type and shape, resulting in switching losses. However, with the method for manufacturing size-adjustable wrap-around cartons according to the present invention, this can be improved and it becomes possible to handle small lots and a wide variety of products.

[0127] In this way, according to the present invention, it is possible to provide a method for making adjustable-size wrap-around cartons that uses blanks that are suitable for wrap-around type automatic carton making machines and allows the carton height to be changed without changing the shape. [Explanation of symbols]

[0128] 10. Rectangular base 20. Rectangular flap 21 Rectangular flap 22 Rectangular flap 23 Rectangular flap 30....Inner flap that can form the top surface 31....Inner flap that can form the top surface 32....Outer flap that can form the top surface 33....Outer flap that can form the top surface 50···fold line 51···Fold line 52···Fold line 53···Fold line 60···fold line 61... fold line 62···Fold line 63... fold line 70···Fold line 71···Fold line 72···Fold line 73···Fold line 80··· fold line 81···Fold line 82···Fold line 83···Fold line 90...square 100...Blank 101··Carton a: Distance to the top side of the trapezoid b Length of short side h height

Claims

[Claim 1] A method for forming a variable size wrap-around carton which is assembled and formed by an automatic wrap-around type carton forming machine, comprising the steps of: The carton thus formed is a hexahedron having a total of six sides: a rectangular bottom, four sides of the body, and a rectangular top. The carton blank is made of a flat material and is formed with a square outer periphery. The blank has a rectangular bottom surface of the carton disposed in the center of the square, The four sides of the rectangular base face directly opposite the four corners of the square, Four rectangular flaps that form the four faces of the hexahedral body are formed continuously from the four sides of the rectangular bottom via fold lines, Further outward from the four rectangular flaps, two inner flaps and two outer flaps are formed which can be folded to form a rectangular top surface, The inner flap is an isosceles triangle that is continuous with the two rectangular flaps on the short sides of the rectangular base and has right-angled vertices at the corners of the square, The outer flap is a trapezoid formed by cutting off the right-angled apex of an isosceles triangle, the right angle of which is the corner of the square, and is continuous with the two rectangular flaps on the long side of the rectangular base. The four rectangular flaps forming the four faces of the hexahedral body have a plurality of fold lines parallel to the fold lines of the four sides of the bottom face of the connected rectangle provided on each of the rectangular flaps; In addition, the distances of the plurality of fold lines from the fold lines of the four sides of the rectangular bottom surface are set equal on the four rectangular flaps, In the box-making process, any one of the plurality of fold lines can be selected and folded inward to form a rectangular top surface, Among the four rectangular flaps forming the four faces of the hexahedral body, a pair of opposing flaps continuing to the bottom face of the rectangle have small flaps provided on both side ends of a rectangle surrounded by the plurality of fold lines and the ends of the flaps, the small flaps being provided continuously through the fold lines; Among the small flaps, the tip of the outermost small flap is provided on the same line as the outer periphery of the square or on the inside thereof, When the length of the short side of the rectangular bottom is b, and the distance from the fold line closest to the long side of the rectangular bottom among the multiple fold lines of the flap that are continuous with the long side of the rectangular bottom to the upper side of the trapezoid of the outer flap is a, a≦b And, The blanks supplied in this form are - Fold the small flaps according to the size, -Inner flap can be raised to fit the size. - Small flap folds that were not folded in the small flap fold, - Inner flap fold-in, ・Raise the outer flap, - Folding in the outer flap and sealing the top, The method for making a size-adjustable wrap-around carton is characterized in that the steps are assembled in the order given above to make a hexahedral box.

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