JP7615901B2 - How to make variable size wrap-round cartons - Google Patents

Description

The present invention relates to a method for manufacturing cartons that are compatible with wrap-around type automatic carton making machines. In particular, the present invention relates 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 changing the type or product.

Generally, cartons are paper packaging materials, and are widely used in which blanks made of paperboard or corrugated cardboard are assembled into a three-dimensional box-shaped container that can store contents.

The wrap-around method, in particular, involves wrapping the contents from all sides to form a box and then sealing it. It has good productivity and has been put to practical use as an automatic carton-making machine, making it a common method. In particular, when using blanks known as the Yakko type (Tato type), it is suitable for packaging thin products.

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 that the strength will be insufficient. It is not compatible with wrap-around type automatic box-making machines, and its applications are limited.

Japanese Utility Model Application Publication No. 3-035019

The present invention was made in consideration of such circumstances, and aims to provide a method for making adjustable-size wrap-around cartons that uses blanks suitable for wrap-around type automatic carton making machines and allows the height of the carton to be changed without changing the shape.

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 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.

The present invention provides a method for making variable-size wrap-around cartons that uses blanks suitable for wrap-around automatic carton making machines and allows the height of the carton to be changed without changing the shape.

In other words, the blank is made of a flat material and is formed with a square as the outermost periphery, and the blank has the rectangular bottom of the carton placed in the center of the square, with the four sides of the rectangular bottom directly facing 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 assembled into a box, the four corners of the square are folded against each other, resulting in a more aesthetically pleasing appearance.

In addition, a blank shape with a square outer periphery can reduce material loss when forming the blank.

The flaps that can form the rectangular top surface are formed continuously outboard of the four rectangular flaps that form the body of the blank as two inner flaps and two outer flaps that can form the top surface, and the inner flaps are continuous with the two rectangular flaps on the short side of the rectangular base surface, forming an isosceles triangle with the corners of a square as right-angle vertices.

The outer flap is a trapezoid, connected to the two rectangular flaps on the long sides of the rectangular base, with the right-angled apex of an isosceles triangle with the corner of a square as the right-angled apex cut off, and these 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 of the connected rectangular base, so that when folding the inner and outer flaps to form the rectangular top surface of the carton during box making, any one of the plurality of fold lines can be selected and folded to selectively determine the height of the body of the carton to be made. In other words, the present invention provides a manufacturing method for cartons that can be made to different cartons of preset heights.

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.

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

In addition, 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 ends of a 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.

The tips of the small flaps on the outermost side of the blank are aligned on the same line as the square perimeter or are located further inside, allowing the wrap-around method to be used smoothly without interfering with automatic box making. In addition, because the outermost perimeter of the blank is square, it is possible to reduce the loss of blank material when punching out the blank.

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 of the flap that is continuous with the long side of the rectangular bottom 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.

In addition, the supplied blanks 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,
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.

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. 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. FIG. 3 is a schematic plan view of a blank for explaining details of flaps 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. 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. FIG. 5 is a schematic perspective view of a blank before assembly, for illustrating how the blank used in the method for producing a size-adjustable wrap-around carton according to the present invention is assembled. FIG. 6 is a schematic perspective view showing folding of small flaps in a number appropriate to the size, for explaining the assembly of a blank used in the method for manufacturing a size-adjustable wrap-around carton according to the present invention. FIG. 7 is a schematic perspective view showing inner flaps raised according to size, for explaining a state in which blanks used in the method for manufacturing a size-adjustable wrap-around carton according to the present invention are assembled. FIG. 8 is a schematic perspective view showing the folding of the small flap that was not folded in step (1) to explain the assembly of a blank used in the box-making method for a size-adjustable wrap-around carton according to the present invention. FIG. 9 is a schematic perspective view showing folding of inner flaps, for explaining the state of assembling a blank used in the method of manufacturing a size-adjustable wrap-around carton according to the present invention. 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. FIG. 11 is a schematic perspective view showing sealing of the top surface, illustrating the assembly of blanks used in the method for manufacturing a size-adjustable wrap-around carton according to the present invention. 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. 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 the carton at the middle height in the method for producing a size-adjustable wrap-around carton according to the present invention. FIG. 14 is a schematic perspective view illustrating a state in which the height of the carton is reduced and the carton is folded at the first crease in the method for producing a size-adjustable wrap-around carton according to the present invention.

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

Figure 1 is a schematic plan view of a blank to explain one embodiment of a blank used in the method for manufacturing a size-adjustable wrap-around carton according to the present invention.

The blank (100) used in the present invention is formed by assembling a carton using an automatic box-making machine using the wrap-around method, and the carton thus formed is a hexahedron.

The six sides are the rectangular bottom, the four sides of the body, and the rectangular top, making a total of six sides, and the blank (100) is made of flat materials such as paperboard or corrugated paper. In this specification, the term carton includes boxes made of paperboard, corrugated paper, etc.

Cartons assembled and made using the wrap-around method are widely used as packaging containers for products in a variety of fields, including beverages, processed foods, and daily necessities. In other words, a blank (100) made of paperboard or cardboard base paper is made into a box by wrapping the contents from all sides using 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 together to make the box automatically.

The present invention proposes a method for making blanks (100) using an automatic wrap-around type box making machine, and aims to provide a method for making variable-size wrap-around cartons that can make cartons of different heights without changing the shape.

The example 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 known as a "Yacko" type. As mentioned above, the blank (100) can be made of paperboard, cardboard base paper, etc.

The blank (100) has the rectangular bottom surface (10) of the carton located in the center of the outermost square (90), and each of the four sides of the rectangular bottom surface (10) faces directly toward the four corners of the outermost square (90).

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 FIG. 1, the short sides of the rectangle are creases (50) and (51), and the long sides of the rectangle are creases (52) and (53).

Flaps on the four sides of the rectangular bottom surface (10) form the four sides of the hexahedral body, and flaps that form the rectangular top surface are formed on the outside of the hexahedral body. These are connected to the rectangular bottom surface (10) via fold lines (50), (51), (52), and (53).

In the example shown in Figure 1, the rectangular flaps on the four sides of the hexahedral body are rectangular sections with mesh. The method for making size-adjustable wrap-around cartons according to the present invention aims to make it possible to make cartons of different heights in a wrap-around type automatic box making machine without changing the type or shape by pre-creating multiple fold lines on the rectangular flaps on the four sides of the hexahedral body and folding them selectively.

Figure 2 is a schematic plan view of a blank for explaining each part that constitutes the blank in one embodiment of the blank used in the method for manufacturing a size-adjustable wrap-around carton according to the present invention.

As described above, the blank (100) has the portion that will become 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). Note that, unlike Figure 1, in the example shown in Figure 2, the four corners of the square (90) are shown located at the top, bottom, left and right.

Four flaps, 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).

In the example shown in Figure 2, the rectangular flaps that form the four sides of the hexahedral body are meshed in four places.

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

Similarly, the rectangular flap (21) is continuous with the rectangular base (10) via the fold line (51).

Similarly, the rectangular flap (22) is continuous with the rectangular base (10) via the fold line (52).

Similarly, the rectangular flap (23) is continuous with the rectangular base (10) via the fold line (53).

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.

That is, the rectangular flap (20) is connected to an inner flap (30) that can form a rectangular top surface.

Similarly, an inner flap (31) that can form a rectangular top surface is continuous with the rectangular flap (21).

Similarly, an outer flap (32) that can form a rectangular top surface is continuous with the rectangular flap (22).

Similarly, an outer flap (33) that can form a rectangular top surface is continuous with the rectangular flap (23).

The four outer flaps that can form the rectangular top surface can be folded inward from all four sides to form a rectangular top surface when the box is made using a wrap-around type automatic box-making machine.

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

The outer flap (32) on the long side of the rectangular base (10), which can form a rectangular top surface, and the two outer flaps (33) which can form a rectangular top surface, are trapezoids with the right-angled vertices of an isosceles triangle cut off, with the right and left corners of the outermost square (90) as right-angled vertices.

This cutting off of the 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 the rectangle; the dimensional specifications will be described later when explaining Figure 4.

In the example shown in Figure 2, of the four rectangular flaps that form the four sides of the hexahedral body, a pair of flaps on the short sides have small flaps (40) that are continuous with each other via the fold lines at both ends of a rectangle surrounded by multiple fold lines and the sides of the flaps.

The example shown in FIG. 2 has a rectangular flap (20) connected to the short side of the rectangular bottom surface (10), and small flaps (40) at both ends of the rectangular flap (21) opposite it.

In addition, in the example shown in Figure 2, three small flaps (40) are provided on each side.

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.

Figure 3 is a schematic plan view of a blank for use in one embodiment of the method for manufacturing a size-adjustable wrap-around carton according to the present invention, illustrating the details of the flaps that make up the blank.

The four rectangular flaps that form the four faces of the hexahedral body have multiple fold lines that are parallel to the fold lines of the four sides that form the bottom face (10) of the connected rectangle, and are equidistant from the fold lines of the four sides. In the example shown in Figure 3, each flap has three fold lines.

In the example shown in Figure 3, the four rectangular flaps on the hexahedral body are the four rectangular meshed parts.

The fold lines on the four sides surrounding the rectangular bottom surface (10) are the boundary lines with each of the connected flaps, and there are four of them: fold line (50), fold line (51), fold line (52), and fold line (53).

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

Similarly, the rectangular flap (21) on the opposite short side has three fold lines (61), (71), and (81) in order from the side closest to the rectangular bottom surface (10).

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

Similarly, the rectangular flap (23) on the opposite long side has three fold lines (63), (73), and (83) in order from the side closest to the rectangular bottom surface (10).

These flaps have multiple fold lines, and when the flaps are folded to form the top surface during the carton making process, one of the fold lines is selected and folded, allowing the height of the carton to be selectively determined.

Therefore, in the example shown in Figure 3, each rectangular flap has three fold lines, so cartons of different heights can be made by selecting which fold lines to use.

In other words, the method for making size-adjustable wrap-around cartons according to the present invention aims to make it possible to make cartons of different heights in a wrap-around type automatic carton making machine without changing the shape by providing multiple fold lines in advance on the flaps on the four sides of the hexahedral body.

Therefore, according to the present invention, the size can be changed by selectively folding multiple fold lines. If 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.

Figure 4 is a schematic plan view of a blank for explaining the small flap portion in more detail in one embodiment of the blank used in the method for making a size-adjustable wrap-around carton according to the present invention.

In the example blank shown in Figure 4, of the four rectangular flaps that form the four sides of the hexahedral body, a pair of opposing flaps have small flaps (40) that are continuous with each other via the fold lines at both ends of a rectangle surrounded by multiple parallel fold lines and the sides of the flaps.

In the example shown in Figure 4, the four rectangular flaps that form the four sides of the hexahedral body are rectangular portions that are shaded, just like in Figures 1 to 3.

In the example shown in FIG. 4, a rectangular flap (20) is 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.

In the example shown in Figure 4, three small flaps (40) are provided on each side. As mentioned above, the small flaps (40) are effective in sealing the four vertical ridges of the hexahedral body during box making, and are also effective in increasing the mechanical strength of the hexahedral carton.

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

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

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

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.

Similarly, the distance (a) to the top edge of the trapezoid is also the distance between the fold line (62) and the top edge of the trapezoid of the outer flap (32) that can form a rectangular top surface.

Because 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 tips of those flaps do not extend beyond the ridges of the opposing long sides of the rectangular top surface, and the carton can be made using an automatic box making machine that uses the wrap-around method.

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.

Figure 5 is a schematic perspective view of a blank before assembly to explain how the blank is assembled for use in the method for manufacturing a size-adjustable wrap-around carton according to the present invention.

The blank (100) has the rectangular bottom surface (10) of the carton located in the center of the square (90), and each of the four sides of the rectangular bottom surface (10) faces the four corners of the outermost square (90).

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 FIG. 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).

Continuing from the four sides of the rectangular bottom surface (10) are rectangular flaps that form the four sides of the hexahedral body and a flap that can form a rectangular top surface, which are connected via fold lines (50), (51), (52), and (53).

The method for making a size-adjustable wrap-around carton according to the present invention proposes an optimal method for making a box by folding successive flaps around the rectangular bottom surface (10) in sequence 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 be used to make cartons of different heights without changing the shape.

Figure 6 is a schematic perspective view showing the folding of small flaps in the number appropriate to the size, to explain the assembly of a blank used in the method for manufacturing a size-adjustable wrap-around carton according to the present invention.

The assembly of the blank (100) begins with folding the small flaps (40) of the supplied blank (100). This involves folding the number of small flaps (40) 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.

In the present invention, the size of the carton is variable, and it is possible to create different heights for the rectangular bottom (10) and rectangular top. In the example shown in Figure 6, the carton height is the lowest of the three adjustable levels.

Which fold lines are selected to create cartons of different sizes will be explained in Figures 12 to 14 below, but this is the process of folding in the small flaps at both ends of the part that will become the four body sides of the carton, leaving the other small flaps.

In the example shown in Figure 6, only the small flaps at both ends of the rectangle near the bottom (10) are left, 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, there is only one small flap, so this is an example of making a carton with a low height within the range of variable heights.

Figure 7 is a schematic perspective view showing how the inner flaps are raised to fit the size, to explain how the blanks used in the method for making size-adjustable wrap-around cartons according to the present invention are assembled.

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 base of the rectangle. The flap is raised by raising the inner flap in the direction of the thick arrow in the figure.

The rectangular flap (20) on the short side has three fold lines (60), (70), and (80) in order from the side closest to the rectangular bottom surface (10). In the example shown in Figure 7, the flap is folded 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.

The other rectangular flap (21) on the short side has three fold lines (61), (71), and (81) in order from the side closest to the rectangular bottom surface (10). In the example shown in Figure 7, the flap is folded upward at 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.

Figure 8 is a schematic perspective view showing the small flap fold that was not folded in step (1) to explain the assembly of a blank used in the method for manufacturing a size-adjustable wrap-around carton according to the present invention.

The next step in the assembly of the blank is a schematic perspective view showing the minor flap fold that was not folded in the step shown in Figure 6.

As mentioned 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 Figure 6 are folded upward, so that the small flaps overlap each other in this area.

By doing this, the two inner flaps are folded inward in the wrap-around box making process, and the box is prepared to form a rectangular top surface from the short side.

Figure 9 is a schematic perspective view showing the folding of the inner flaps to explain the assembly of a blank used in the method for manufacturing a size-adjustable wrap-around carton according to the present invention.

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), forming 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.

In addition, in the state shown in Figures 7 and 8, the portion of the inner flap that is folded along the 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.

Figure 10 is a schematic perspective view showing the outer flap raising to explain how to assemble a blank used in the method for manufacturing a size-adjustable wrap-around carton according to the present invention.

The next step in assembling the blank is to raise the outer flaps. Here, the outer flaps (32) and (33) are raised in the direction of the thick arrows in the figure along the fold lines (52) and (53).

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

Figure 11 is a schematic perspective view showing the sealing of the top surface to explain how to assemble a blank used in the method for manufacturing a size-adjustable wrap-around carton according to the present invention.

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 fold lines (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.

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.

The height of the carton (101) at this time is indicated by height (h) in FIG. 11, and is the distance between crease (53) and crease (63). In other words, the rectangular flap is folded at the first crease of the multiple creases to reduce the height of the carton (101).

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
As a result, when forming the rectangular top surface of the carton, even when the outer flaps (32) and (33) capable of forming the rectangular top surface are folded inward, the tips of the outer flaps do not protrude from the opposing ridges of the rectangular top surface, and the carton (101) can be manufactured. This can be seen in the shape of the rectangular top surface of the carton (101) in Figure 11.

Figure 12 is a schematic perspective view of one embodiment of a blank for a size-adjustable wrap-around carton according to the present invention, illustrating how the carton is folded to a high height and assembled at the third fold line.

The example shown in FIG. 12 is an example of assembling a carton with a high variable height. That is, the triangular inner flap (30) that can form the top surface is folded in at the fold line (80), and the triangular inner flap (31) that can form the top surface is folded in at the fold line (81).

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). In this way, the four flaps are folded inward to form the rectangular top surface of the carton (101).

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.

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). In other words, of the multiple creases on the rectangular flaps, the carton (101) is assembled to be tall by folding along the creases (80) and (81) on the inner flap, and along the creases (82) and (83) on the outer flap.

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

Figure 13 is a schematic perspective view of one embodiment of a blank for a size-adjustable wrap-around carton according to the present invention, illustrating how the carton is folded to the middle height at the second fold line and assembled.

The example shown in FIG. 13 is an example of assembling a carton with a medium variable height. That is, the triangular inner flap (30) that can form the top surface is folded in at the fold line (70), and the triangular inner flap (31) that can form the top surface is folded in at the fold line (71).

Furthermore, the trapezoidal outer flap (32) capable of forming the top surface is folded in along the fold line (72), and the outer flap (33) capable of forming the top surface is folded in along the fold line (73). In this way, the four flaps are folded inward to form the rectangular top surface of the carton.

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.

The height of the carton (101) at this time is indicated by height (h) in Fig. 13 and 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 along creases (70) and (71), and the outer flap is folded along creases (72) and (73), to assemble the carton (101) at a medium height.

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

Figure 14 is a schematic perspective view of one embodiment of a blank for a size-adjustable wrap-around carton according to the present invention, illustrating how the carton is folded to a low height and assembled at the first fold line.

The example shown in FIG. 14 is an example of assembling a carton with a high variable height. That is, the triangular inner flap (30) that can form the top surface is folded in at the fold line (60), and the triangular inner flap (31) that can form the top surface is folded in at the fold line (61).

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). In this way, the four flaps are folded inward to form the rectangular top surface of the carton.

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.

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). In other words, of the multiple creases on the rectangular flaps, the first crease, i.e., the inner flap, is folded along crease (60) and crease (61), and the outer flap is folded along crease (62) and crease (63), resulting in the carton (101) being assembled at its lowest height.

In this way, in one embodiment of a blank for a sizing-variable wrap-around carton, it is possible to form a carton (101) with the lowest height (h) of the three stages.

In this way, according to the present invention, it is possible to produce cartons (101) of three different heights, as shown in Figures 12 to 14, using the same blank without changing the mold.

Cartons formed using size-adjustable wrap-around carton blanks can be used, for example, to store sheets of the same size with varying numbers of contents.

As a specific example, for example, in the case of a carton for storing medicinal patches, it is possible to realize a method for 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.

In other words, conventionally, when manufacturing cartons of different sizes, it was necessary to switch between different product types and shapes, resulting in switching losses. However, the method for manufacturing size-adjustable wrap-around cartons according to the present invention can improve this situation, making it possible to handle small lots and a wide variety of products.

In this way, the present invention provides a method for making variable-size wrap-around cartons that uses blanks suitable for wrap-around automatic carton making machines and allows the height of the carton to be changed without changing the shape.

10: Rectangular bottom surface 20: Rectangular flap 21: Rectangular flap 22: Rectangular flap 23: Rectangular flap 30: Inner flap capable of forming top surface 31: Inner flap capable of forming top surface 32: Outer flap capable of forming top surface 33: Outer flap capable of forming 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: Rectangle 100: Blank 101: Carton a: Distance to top side of trapezoid b: Length of short side h: Height

Claims (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.