Carton for bag-in-carton

Abstract

To provide a carton for a bag-in-carton, which is a hexahedral carton in its initial state, of which, when opening, a part is opened, the spout of an inner bag is pulled out of a paper container and fixed, and which has a structure that can be made into a heptahedron by adding a slope, and of which opening and spout-fixing are easy and stable, which is excellent in appearance, and does not show the abutment line between flaps on the top surface.SOLUTION: Provided is a carton for a bag-in-carton characterized in that, in the initial state of carton making, it is a rectangular parallelepiped, and the top surface of the carton is composed of four flaps that connect upward from the four sides of the body and are sequentially stacked, and when removing liquid content, the carton can be transformed into heptahedron with newly formed slopes added to the initial assembled hexahedron, into a state where liquid content can be poured out.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a double container, in particular a bag-in-carton carton that is made of a paper container on the outside and has an inner bag made of a plastic film as a base material on the inside, and can be used as a liquid container. [Background technology]

[0002] In today's modern lifestyle, in the distribution and sales of liquid products, a large number of products using plastic bottles, liquid containers made of plastic film, and paper containers for liquids are produced, distributed, sold and delivered to consumers, supporting our daily lives.

[0003] For example, beverages such as juice, dairy drinks, and alcoholic beverages are filled in predetermined amounts into liquid containers such as glass, plastic bottles, and liquid paper containers by liquid filling devices at the manufacturer, sealed, and then delivered as a product.

[0004] Among these, there is a container called a bag-in-carton, which is a double container in which an inner bag made of plastic film is filled with liquid, a spout is sealed, and the container is then stored in a paper box.

[0005] In the case of such double-layered containers, since the outer container is a paper container, they can be made into a rectangular or cubic shape, which makes them easy to stack, and makes it possible to improve inventory efficiency and transportation efficiency in warehouses, etc.

[0006] The outer paper container can also strengthen mechanical strength, including impact resistance, and block environmental influences such as ultraviolet rays. The outer paper container can also be easily decorated with printing or other surface decoration, and a paper box on the outside is more convenient to carry and easier to handle than a plain plastic container.

[0007] In addition, the inner bag is made of plastic film, making it suitable for storing liquids, and can be sealed by opening and closing the spout, allowing the required amount to be taken out and stored each time. Furthermore, when discarding a used double container, the paper container and the inner bag made of plastic film can be easily separated, and the volume can be reduced by folding or crushing, making it widely accepted as an environmentally friendly liquid container.

[0008] In the case of such a double container capable of storing liquid, the spout attached to the inner bag can be exposed by protruding outward from the outer paper container, making it easier to take out the liquid when needed.

[0009] In this case, the spout requires preparation before use, such as providing an opening on the outer paper container and a flap that connects to the opening, and then pulling the spout out from the opening and then fixing the spout to the opening of the paper container using the flap, which makes it cumbersome.

[0010] Alternatively, if the spout is exposed and protrudes from the paper container in advance, a plastic part may be required to secure the spout in place, and there is also the problem that the exposed and protruding spout can make stacking and handling difficult.

[0011] Patent Document 1 proposes a bag-in-carton carton for liquids that is convenient for disassembly, separation, and sorting after use, but before use, the paper container is a heptahedron with one side of a rectangular parallelepiped cut diagonally, making it difficult to accommodate a wrap-around packaging format. In addition, the spout is exposed and protrudes outward, and there is a problem that the shape of the paper container and the exposed spout make it difficult to stack and handle.

[0012] Alternatively, if an inner bag with a spout is built into a rectangular paper container and the spout is exposed by protruding it outward when in use, and then fixed in place to open it, a series of assembly steps must be performed by hand, requiring complicated work.

[0013] FIG. 1 is a perspective (partially see-through) schematic diagram for explaining a typical bag-in-carton.

[0014] In the example shown in FIG. 1, the carton (10) is a seven-sided body having six sides: a top surface (16), a bottom surface (11), a front body section (12), a left body section (13), a right body section (14), and a rear body section (15). In addition, the carton (10) has a slope (17) that descends from the top surface (16) to the front body section (12). A spout (51) that is continuous with an inner bag (50) is fixed to the outside of the carton (10) and protrudes from the slope (17).

[0015] The carton (10) for this type of bag-in-carton (100) is not suitable for the wrap-around type automatic packaging format as is, and since it is made with an exterior shape that includes a slope (17) in advance, it is difficult to stack them during transportation, storage, and handling, making it less convenient.

[0016] In addition, in order to assemble the inner bag (50) filled with liquid by placing it inside the carton (10) and fixing the spout (51) to the slope (17), a separate member for fixing may be required, which may be costly and time-consuming to install. In addition, the work of aligning the spout (51) with the cutout and opening of the carton (10) is complicated. [Prior art documents] [Patent documents]

[0017] [Patent Document 1] JP 2018-122912 A Summary of the Invention [Problem to be solved by the invention]

[0018] In this regard, we have devised a bag-in-carton carton that is initially a hexahedral carton that can accommodate wrap-around packaging formats, and that, when opened, can be opened by opening the top of the carton, pulling out the spout of the inner bag to the outside of the paper container and fixing it in place, and then pulling the spout out of the carton to fix it in place by adding a slope to make it a 7-sided carton. This is the intention of the carton (Patent Application No. 2020-195012).

[0019] However, in this invention, the top surface was formed from continuous flaps extending from the front, back, left and right body parts, and although it was possible to accommodate a wrap-around type packaging format, the outermost layer of the top surface made up of the left and right flaps had a shape in which the flaps extended from the left and right and butted together in the centre of the top surface, making the boundary line where the flaps butted together visible and exposed, and so was not satisfactory in terms of appearance.

[0020] The example shown in FIG. 2 is for the bag-in-carton (100) described above according to our previous ideas. It is clear that in the center of the top surface (16) of the carton (10), flaps continuing from the left and right body sections are butted together in the direction of the arrows in the figure, and the boundary line (8) mars the appearance.

[0021] The present invention has been made in consideration of such circumstances, and an object of the present invention is to provide a carton for a bag-in-carton which is compatible with the wrap-around packaging format and which has a structure in which, in its initial state, it is a six-sided carton and, when opened, a part of the carton is opened and the spout of the inner bag is pulled out to the outside of the paper container and fixed in place to make it a seven-sided carton with an added slope, which is easy and stable to open and has a spout that is easy and stable to fix, and which has an excellent appearance as the butt lines where the flaps meet are not visible on the top surface. [Means for solving the problem]

[0022] As a means for solving the above problem, the invention described in claim 1 is: A carton for a bag-in-carton, which is composed of a carton that is a paper outer box and an inner bag made of a plastic film as a base material, The inner bag has a spout and is capable of storing liquid, The spout is made of a molded plastic product and has a groove at its base for fixing it to the opening when the carton is opened. The carton is made in such a way that the inner bag is covered from the outside. In the initial state after being assembled, the carton has an external shape that is a rectangular parallelepiped with four sides (back, right, front, and left) plus a top and bottom, for a total of six sides. The four sides of the body are hollow rectangular prisms that enclose the inner bag. The top surface of the carton is made up of four flaps (A), (B), (C), and (D) that are connected upward from the four sides of the body (back, right, front, and left). The innermost layer of the top surface has a flap (A) that continues from the rear body and is folded at a right angle from the back to the front. A slit is formed through the paper in the center of the ridge between this flap (A) and the rear body. The flap (B) continuing from the right side of the body is folded over the flap (A) at a right angle to the top surface. The flap (B) has a fold line (b) in the height direction near the center, and the front edge of the flap (B) has a concave notch. The flap (C) continuing from the front body part is folded over the flap (B) at a right angle to the top surface. The flap (C) has a tab starting at the center of its tip, with two vertical perforations forming the left and right ends of the tab, and furthermore, continuing downward from the end point, there is a cut line that allows both side ends of the tab to be cut off; The flap (C) has a fold line (c) in the width direction between the ridge line between the front body portion and the tab portion, The flap (D) continuing from the left side body part is folded at a right angle over the flap (C) to cover the outermost layer of the top surface. When the flap (D) overlaps with the flap (C), the flap (D) has a tab at the same position as the flap (C), and two pre-cut lines are formed to form both the left and right ends of the tab. Furthermore, perforations are formed in a shape that continues from the end points of the pre-cut lines and opens in a V-shape to reach both ends of the flap (D). This flap (D) has a fold line (d) between the lower end of the "V-shape" and the front edge of the flap (D) at a position where it overlaps with the fold line (c) of the flap (C), There is a circular perforation at the top of the front body that can be cut out. Below this circular perforation, there is a fold line ( e) is provided, From the top end of the front body to both ends of the fold line (e), perforations are provided on the ridges between the front body and both left and right body parts. There are two diagonal fold lines on each of the left and right torsos, each extending from both ends of the fold line (e) to the center of the ridge of the left torso and flap (D) and the right torso and flap (B); Further, perforations are provided on the ridges between the left side body and the flap (D) and between the right side body and the flap (B) that continue from the end point of the diagonal fold line toward the front body, The bottom of the carton is formed by folding and stacking the flaps that connect downward from the four sides of the body: the back, right side, front, and left side. This makes it possible to construct a rectangular parallelepiped carton with a total of six sides in its initial state after the inner bag is enclosed and boxed. When opening this bag-in-carton carton and taking out the liquid content stored in the inner bag, The stacked tabs of the top flaps (C) and (D) of the carton are grasped with the fingers to lift up the two layers together, and the carton is opened by tearing the perforations in the "V-shaped" portion of the tabs and flap (D). Cut the perforations along the ridges between the front body and both left and right body sections from the top end of the front body to both ends of the fold line (e), Pull the tab further towards the front and fold the flap (B) diagonally downward along crease (b). The diagonal fold lines of the left and right body parts continuing from both ends of the fold line (e) are used as hypotenuses, and the right-angled triangular areas formed by the perforations continuing thereto are folded inward along the diagonal fold lines, Also, cutting the releasable circular perforation to form a circular opening; The concave notch of the flap (B) is fitted into the groove at the base of the spout and fixed, and the tip of the spout is pulled out from the circular opening to be exposed, Next, between the fold line (d) and the fold line (e), a slope having a circular opening and descending forward is formed between the top surface and the upper part of the front body, Furthermore, the upper part of the fold line (d) is placed over the top surface, and the tab is folded at a right angle along the fold line provided on the tab, and inserted into the slit that penetrates the paper at the center of the ridge between the flap (A) and the rear body part, and fixed; The carton is then assembled into a 7-sided shape with the newly formed slope added to the initial 6-sided shape. This carton for bag-in-carton use is characterized by being capable of being transformed into a state in which the liquid content can be poured out.

[0023] As a means for solving the above problem, the invention described in claim 2 is: When flap (D) and flap (C) overlap on the top surface, The flap (C) has a tab starting at the center of its tip, two vertical pre-cut lines that form the left and right ends of the tab, and a perforation that opens in a "V-shape" that continues to the end of the pre-cut lines and reaches both ends of the flap (C). The flap (D) has a tab portion at the same position as the flap (C), two perforations that form the left and right ends of the tab portion, and further has a "V-shaped" pre-cut line that continues from the end points of the perforations and is at the same position as the flap (C).This is a carton for a bag-in-carton as described in claim 1.

[0024] As a means for solving the above problem, the invention described in claim 3 is: When flap (D) and flap (C) overlap on the top surface, The flap (C) has a knob portion starting from the center of its tip, and both left and right ends of the knob portion The two vertical perforations form the flap (C), and the cut lines continue from the end of the perforations and open in a V-shape to reach both ends of the flap (C). The flap (D) has a handle portion at the same position as the flap (C), two pre-cut lines that form the left and right ends of the handle portion, and a "V-shaped" perforation that continues from the end points of the pre-cut lines and is at the same position as the flap (C). This is a carton for a bag-in-carton as described in claim 1.

[0025] As a means for solving the above problem, the invention described in claim 4 is The carton for a bag-in-carton according to any one of claims 1 to 3 is characterized in that, among the flaps constituting the bottom surface, the flap arranged in the outermost layer has a size sufficient to cover the bottom surface. Effect of the Invention

[0026] According to the present invention, a carton for a bag-in-carton is capable of accommodating a wrap-around type packaging format, and in its initial state is a six-sided carton, and when opening it, part of the carton is opened, the spout of the inner bag is pulled out to the outside of the paper container and fixed in place, and a seven-sided carton is formed by adding a slope.This carton is easy to open, and the butt lines where the flaps meet are not visible on the top surface, making it easy to open and providing an excellent appearance.

[0027] In particular, since the carton is a hexahedron in the initial state, the double container can be used in an automatic wrap-around packaging format, and the carton is easy to stack for storage and handling, and has the advantage of being efficient in transportation. Since the spout is stored inside the carton in the initial state, there is no risk of contact or contamination from the outside, which is also preferable from the standpoint of hygiene.

[0028] Furthermore, when opening the cap to pour out the contents, slopes are formed on the top surface and the upper part of the front body, allowing the spout to be pulled out and easily secured to the carton without the need for a separate member for securing it, making this a highly convenient bag-in-carton carton.

[0029] In addition, of the flaps that make up the top surface, flap (D) that continues from the left side body section is positioned as the outermost flap, and flap (D) is of a size and shape that covers the entire top surface, so that the boundary line where the flaps meet is not visible, making it possible to provide a carton for bag-in-carton use that has excellent appearance.

[0030] When opening, the flap (C) has a handle starting at the center of its tip, two vertical perforations that form the left and right ends of the handle, and pre-cut lines that continue downward from the end of the perforations allow for the separation of both side ends of the handle. The outermost flap (D), when overlapped with the flap (C), has a handle in the same position as the flap (C) and two pre-cut lines that form the left and right ends of the handle, and the perforations that continue from the end of the pre-cut lines open in a V-shape and reach the end of the flap (D). Therefore, when pinching and tearing the handle to open it, only the force required to tear one layer of the perforations is required, making the opening operation easy and stable.

[0031] In particular, according to the invention described in claim 2, when the flap (D) and the flap (C) overlap on the top surface, the flap (C) has a tab starting at the center of its tip, and two vertical cut lines that form both the left and right ends of the tab, and further, the perforations continue to the end points of the cut lines and open in a "V-shape" to reach both ends of the flap (C). Flap (D) has a handle at the same position as flap (C), with two perforations forming the left and right ends of the handle, and a "V-shaped" pre-cut line continuing from the end of the perforations at the same position as flap (C). This means that the handle can be gripped and torn to open the flap (D) with just enough force to cut through only one layer of perforations, making for an easy and stable opening operation.

[0032] Furthermore, according to the invention described in claim 3 in particular, as in the invention described in claim 2, when the flap (D) and the flap (C) are overlapped on the top surface, the flap (C) has a handle portion starting at the center of its tip, and two vertical perforations that form the left and right ends of the handle portion, and further, continuing to the end of the perforations, the pre-cut lines are formed in a shape that opens in a V-shape and reaches both ends of the flap (C). The flap (D) has a handle portion in the same position as the flap (C), and two pre-cut lines that form the left and right ends of the handle portion, and a V-shaped perforation is formed in the same position as the flap (C) that continues to the end of the cut lines. Therefore, the operation of pinching and tearing the handle portion to open it can be performed with a force that tears only one layer of perforations, making it possible to perform an easy and stable opening operation.

[0033] In particular, according to the invention described in claim 4, in a carton for a bag-in-carton, the bottom surface is formed by folding and stacking flaps that are continuous from the front, back, left and right body parts, and the flaps that are arranged in the outermost layer are large enough to cover the rectangular bottom surface, so that the boundaries where the flaps meet are not visible on the top surface or the bottom surface, making it possible to provide a carton for a bag-in-carton with superior appearance. [Brief description of the drawings]

[0034] [Figure 1] FIG. 1 is a perspective (partially see-through) schematic diagram for explaining a typical bag-in-carton. [Diagram 2] FIG. 2 is a perspective (partially see-through) schematic diagram for explaining a carton for a bag-in-carton according to our previous invention. [Diagram 3] FIG. 3 is a schematic plan view of a carton blank for explaining details of one embodiment of a carton for a bag-in-carton according to the present invention. [Figure 4] FIG. 4 is a schematic perspective view of a carton blank for illustrating the formation of a body portion in a box-making process according to one embodiment of the present invention for a bag-in-carton. [Diagram 5] FIG. 5 is a schematic perspective view of a carton blank for illustrating how the top surface is formed and sealed in the process of making a carton for a bag-in-carton according to one embodiment of the present invention. [Figure 6] FIG. 6 is a schematic perspective view illustrating the external appearance of an assembled carton in an initial state in one embodiment of a bag-in-carton according to the present invention. [Figure 7] FIG. 7 is a schematic perspective view illustrating a state in which one embodiment of a bag-in-carton carton according to the present invention has been transformed into a seven-sided carton with a newly formed slope, allowing the liquid content to be poured out. [Figure 8] FIG. 8 is a schematic perspective view illustrating a state in which a flap continuing from the front body portion and a tab portion continuing therefrom are raised in one embodiment of a carton for a bag-in-carton according to the present invention. [Figure 9] FIG. 9 is a schematic perspective view illustrating a state in the middle of forming a slope in one embodiment of a carton for a bag-in-carton according to the present invention. [Figure 10] FIG. 10 is a perspective (partially see-through) schematic diagram illustrating one embodiment of a carton for a bag-in-carton according to the present invention, in which the carton is made into a seven-sided shape with a slope, the spout is pulled out and fixed in place, and the liquid content can be poured out. [Figure 11] FIG. 11 is a schematic plan view of a carton blank for explaining details of one embodiment of the invention, particularly as set forth in claim 2, in a bag-in-carton carton according to the present invention. [Figure 12] FIG. 12 is a schematic plan view of a carton blank for explaining details of one embodiment of the invention, particularly as set forth in claim 3, in a bag-in-carton carton according to the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0035] The present invention will be described in more detail below with reference to Figs. 3 to 12. However, the present invention is not limited to the examples shown here. The present invention is defined by the claims.

[0036] 3 is a schematic plan view of a carton blank for explaining details of one embodiment of a bag-in-carton carton according to the present invention, showing the blank (9) as seen from the outside surface of the carton (10).

[0037] The present invention relates to a carton (10) for a bag-in-carton (100) that is composed of a carton (10) that is an outer box made of paper and an inner bag (50) made using a plastic film as a base material.

[0038] There are no particular limitations on the paper material, and it is possible to use paperboard or corrugated cardboard, etc., and an appropriate material can be selected and used, taking into consideration the weight of the inner bag (50) when filled with liquid and the mechanical strength required for the carton (10).

[0039] Furthermore, the paper material constituting the carton 10 may be laminated with other materials to form a composite material, if necessary. Alternatively, the surface of the carton 10 that is visible from the outside may be decorated or have information displayed thereon by using a method such as printing.

[0040] The inner bag (50) has a spout (51) capable of storing liquid therein, and the spout (51) is made of a plastic molded product and has a groove at its base for fixing the spout to the opening of the carton (10) when it is opened. The inner bag (50) enclosed in the carton (10) is, for example, as shown in FIG. 1.

[0041] The carton (10) for the bag-in-carton (100) according to the present invention is formed into a shape that covers the inner bag (50) from the outside, and in the initial state after being formed, the carton (10) has an outer shape that is a rectangular parallelepiped consisting of four body sections, namely, a rear body section (15), a right body section (14), a front body section (12), and a left body section (13), as well as a top surface (16) and a bottom surface (11), for a total of six sides.

[0042] When the carton (10) is initially assembled, the four body sides surround the inner bag (50) in the form of a hollow rectangular prism; that is, this shape makes it possible to accommodate a packaging configuration in which the inner bag (50) is enclosed in a wrap-around manner.

[0043] The top surface (16) of the carton is made up of four flaps, flap (A), flap (B), flap (C), and flap (D), which are connected upward from the four body sections: the rear body section (15), the right body section (14), the front body section (12), and the left body section (13). In particular, for flaps (B) and (D), the sides closest to the front body section (12) are defined as the front side, and the sides closest to the rear body section (15) are defined as the rear side.

[0044] At the center of the ridge between the flap (A) and the rear body (15), there is a slit that penetrates the paper. A spout (50) is formed in the paper. The slit (37) penetrates the paper to expose the spout (50) so that the contents of the inner bag (50) can be poured out when the six-sided carton (10) is opened, and when the slope (17) is formed to transform the carton into a seven-sided carton, the tabs (36) and (35) are inserted into the slit (37) to fix the slope (17) to the top surface (16). This opening operation will be described later in the explanation of Figure 7 and subsequent figures.

[0045] The flap (B) has a fold line (b) in the height direction near the center, and the front edge of the flap (B) has a concave notch (38).

[0046] The concave slit (38) can be used to fix the spout (50) when the package is opened. The fold line (b) is used to fold the front side of the flap (B) downward in the process of creating the slope (17) when the package is opened. These processes will be described later in the description of Figures 9 and 10.

[0047] The flap (C) has a tab portion (36) beginning at the center of its tip, with two vertical perforations (20) forming both left and right ends of the tab portion (36), and further with pre-cut lines (21) continuing below the end points of the perforations (29) that allow for the cutting off of both side ends of the tab portion (36). A fold line (c) is provided in the width direction of this flap (C) between the ridge line between the flap (C) and the front body portion (12) and the tab portion.

[0048] A fold line (g) is formed by connecting the end points of the two perforations (20) of the grip portion (36). This fold line (g) can be used as a fold line when the grip portion (36) is inserted into the slit (37) at the end of the opening operation to fix the top surface (16) and the slope (17). This operation will be described later in the explanation from FIG. 7 onwards.

[0049] Flap (D) overlaps flap (C) to form the outermost layer of top surface (16) of carton (10). When flap (D) overlaps flap (C) to form top surface (16), tab (35) of flap (D) is in the same position as tab (36) of flap (C), and two pre-cut lines (22) are formed that define the left and right ends of tab (35).

[0050] In the flap (D), a perforation (23) that continues from the cut line (22) nearer to the front edge of the flap (D) than the cut line (21) along which both side ends of the tab of the flap (C) can be separated is formed in a shape that opens in a V-shape toward the front edge and reaches the end of the flap (D).

[0051] This flap (D) has a fold line (d) between the lower end of the "V-shape" and the front edge of the flap (D) at a position where it overlaps with the fold line (c) of the flap (C).

[0052] In addition, a fold line (h) is formed by connecting the end points of the two cut lines of the grip portion (35). This fold line (h) can be used as a fold line when the grip portion (35) and the grip portion (36) are overlapped and inserted into the slit (37) at the end of the opening operation to fix the top surface (16) and the slope (17). This operation will be described later in the explanation from FIG. 7 onwards.

[0053] A circular perforation (24) that can be cut out is provided at the top of the front body portion (12), and below this circular perforation (24), a fold line (e) is provided in the width direction of the front body portion (12) from ridge line to ridge line, and from the top end of the front body portion (12) to both ends of the fold line (e), a perforation (25) is provided on each of the ridge lines between the front body portion (12) and the left and right body portions. There is a place set up.

[0054] Diagonal fold lines (f) are provided on the left and right sides, one on each side, that extend from both ends of this fold line (e) to the center of each ridge of the left side body portion (13) and flap (D), and the right side body portion (14) and flap (B).

[0055] Furthermore, a perforation (26) is provided at each of the ridges between the left side body portion and the flap (D) and between the right side body portion and the flap (B), which continue from the end point of this diagonal fold line (f) toward the front body portion.

[0056] The bottom surface (11) of the carton has flaps extending downward from the four body sections: the rear body section (15), the right body section (14), the front body section (12), and the left body section (13).

[0057] Of these flaps, the flaps arranged on the outermost layer of the bottom surface (11) can be made large enough to cover the rectangular bottom surface (11). This prevents the generation of boundary lines caused by the abutment of the flaps on the top surface (16) and bottom surface (11), making it possible to produce a carton (10) for a bag-in-carton (100) with superior design.

[0058] Using a blank (9) made of these elements, it is possible to form a carton (10) for a bag-in-carton (100) having a rectangular shape with a total of six sides, which is in its initial state when the inner bag (50) is enclosed and formed into a box.

[0059] FIG. 4 is a schematic perspective view of a carton blank for illustrating the formation of a body portion in a box-making process according to one embodiment of the present invention for a bag-in-carton.

[0060] The carton (10) is made into a shape that covers the inner bag (50) from the outside, and in the initial state after the box is made, its external shape is a rectangular parallelepiped with a total of six sides, consisting of four body sides: the rear body side (15), the right body side (14), the front body side (12), and the left body side (13), plus a top face (16) and a bottom face (11). Therefore, the four body sides surround the inner bag in the form of a hollow rectangular prism.

[0061] On the innermost layer of the top surface, a flap (A) continuing from the rear body portion (15) is folded at a right angle from the rear to the front in the direction of the arrow (1).

[0062] Flap (B) continuing from the right side body portion (14) is placed over flap (A) and folded at a right angle to the top surface in the direction of arrow (2).

[0063] A flap (C) continuing from the front body portion (12) is overlapped with the flap (B) and folded at a right angle to the top surface in the direction of the arrow (3).

[0064] Flap (D) continuing from the left side body portion (13) is folded over flap (C) at a right angle in the direction of arrow (4) to cover the outermost layer of the top surface.

[0065] FIG. 5 is a schematic perspective view of a carton blank for illustrating how the top surface is formed and sealed in the process of making a carton for a bag-in-carton according to one embodiment of the present invention.

[0066] The flap (D) continuing from the left body section (13) is placed over the flap (C) continuing from the front body section (12) and folded at a right angle in the direction of the arrow (5) to cover the outermost layer of the top surface (16).

[0067] When the flap (D) overlaps with the flap (C), it has a knob portion at the same position as the flap (C), and two cut lines (22) are formed to form both the left and right ends of the knob portion.

[0068] Continuing from the two pre-cut lines (22) of the flap (D), perforations (23) open in a V-shape toward the front edge and are formed in a shape that reaches the end of the flap (D). In addition, the flap (D) has a fold line (d) between the bottom end of the V-shape and the front edge of the flap (D) at a position that overlaps with the fold line (c) of the flap (C).

[0069] In the example shown in FIG. 5, as described above, the carton (10) is formed into a shape that covers the inner bag (50) from the outside, and in the initial state after being formed, the carton (10) has an outer shape that is a rectangular parallelepiped consisting of four body sections, namely, the rear body section (15), the right body section (14), the front body section (12), and the left body section (13), as well as a top surface (16) and a bottom surface (11), for a total of six sides.

[0070] Therefore, the four sides of the body are in the form of a hollow rectangular prism that surrounds the inner bag (50). In the example shown in Fig. 5, the overlap of the body continues from the left body part (13), is folded at a right angle in the direction of the arrow (6), and is glued to the outside of the rear body part (15) to form a hollow rectangular prism.

[0071] FIG. 6 is a schematic perspective view illustrating the external appearance of an assembled carton in an initial state in one embodiment of a bag-in-carton according to the present invention.

[0072] In the initial state after the carton (10) is assembled, the inner bag (50) is enclosed and the outer shape of the carton (10) is a hexahedron. Therefore, the bag-in-carton (100) is compatible with the wrap-around type of automatic packaging, and is easy to stack for storage and handling, and has the advantage of being efficient in transportation.

[0073] In this initial state, the spout (51) is also stored inside the carton (10), so it does not get in the way when handling the container and is free from the risk of contact or contamination from the outside, which is also preferable from a hygienic standpoint.

[0074] The flap (D) continuing from the left body section (13) is folded at a right angle over the flap (C) continuing from the front body section (12) to cover the outermost layer of the top surface (16). Therefore, there is no joint between the flaps on the top surface (16), i.e., there is no boundary line, which is preferable in terms of appearance.

[0075] As described above, when flap (D) overlaps flap (C), the flap (D) has a knob portion (35) at the same position as the knob portion (36) of flap (C), and two cut lines (22) are formed which form the left and right ends of the knob portion (35).

[0076] A perforation (23) is formed so as to continue from the end points of the two cut lines (22) and open in a V-shape toward the front edge of the flap (D) and reach the end of the flap (D).

[0077] In addition, this flap (D) has a lower end of the "V-shape" and the front edge of the flap (D), That is, a fold line (d) is provided between the ridge line of the front body portion (12) and at a position overlapping with the fold line (c) of the flap (C).

[0078] In the example shown in Figure 6, another fold line is provided on this flap (D), and fold line (g) is provided connecting the connection point of the tab and the "V-shape". Fold line (g) is also not folded in this state, and this flap (D) is flat.

[0079] A circular perforation (24) that can be cut out is provided at the top of the front body section (12), and below this circular perforation (24) a fold line (e) is provided in the width direction of the front body section (12) from ridge line to ridge line, and perforations (25) are provided on the ridge lines between the front body section and both left and right body sections from the top end of the front body section to both ends of the fold line (e). However, the fold line (e) has not yet been folded at this stage, and the front body section (12) is flat.

[0080] Two diagonal fold lines (f) are provided on the left and right sides from both ends of the fold line (e) to the center of each ridge of the left body and flap (D) and the right body and flap (B); Furthermore, perforations (26) are provided on the ridges of the left side body portion and flap (D) and the right side body portion and flap (B) that continue from the end point of this diagonal fold line (f) toward the front body portion (12).

[0081] As a result, a right triangle with the diagonal fold line (f) as its hypotenuse is formed at the top of the left and right torsos. However, the fold line (f) has not yet been folded at this stage, and the right torso section (14) and the left torso section (13) are flat.

[0082] FIG. 7 is a diagram showing an embodiment of a carton for a bag-in-carton according to the present invention. This is a schematic perspective view to explain the state in which the bottle has been transformed into a seven-sided shape with the addition of a newly formed slope, allowing the liquid contents to be poured out.

[0083] When opening the carton (10) for this bag-in-carton (100) and taking out the liquid content stored in the inner bag (50), the tearable circular perforation (24) is cut off to form a circular opening (18).

[0084] Also, the concave notch (38) on the front edge of the flap (B) is fitted into the groove at the base of the spout (51) and fixed, and the tip of the spout (51) is pulled out from the circular opening (18) and exposed.

[0085] Next, a slope (17) descending forward with a circular opening (18) is formed between the top surface (16) and the upper part of the front body part (12) between the fold lines (d) and (e), and further above the fold line (d) the top surface (16) can be placed over the flap (B).

[0086] At this time, the handle portion (35) is folded at right angles together with the handle portion (36) along the fold lines (h) and (g) provided on the handle portion, and inserted into and fixed in the slit (37) that penetrates the paper at the center of the ridge between the flap (A) and the rear body portion (15). This transforms the carton (10) from a hexahedron in the initial assembled state into a 7-sided shape with the addition of the newly formed slope (17), enabling the liquid content stored in the inner bag (50) to be poured out using the spout (51).

[0087] FIG. 8 is a schematic perspective view illustrating a state in which a flap continuing from the front body portion and a tab portion continuing therefrom are raised in one embodiment of a carton for a bag-in-carton according to the present invention.

[0088] When opening the carton (10) for this bag-in-carton (100) and removing the liquid contents stored in the inner bag (50), one can begin by pinching the tabs (36) of the flap (C) and the tabs (35) of the outermost flap (D), which make up the top surface (16) of the carton (10), with one's fingers and lifting the two layers together in the direction of the arrow (29) while still stacked.

[0089] At this time, since both side portions of the tab portion (35) of the flap (D) are cut along the pre-cut line (22), and both end portions of the tab portion (36) of the flap (C) are perforated (20), it is possible to open the package by simply tearing through one layer of the perforation.

[0090] Next, the opening continues by cutting the perforation (23) in the "V-shaped" portion of the flap (D) that is continuous with the cut line (22), but at this time, the portion of the flap (C) that connects to the perforation (20) is provided as the cut line (21) downward from the connection point, and both sides of the tab (35) and the tab (36) are separated from the flap (D) and the flap (C). Therefore, this cutting and separation is also performed with only the force to cut one layer of the perforation, and the package can be opened.

[0091] That is, in the present invention, the operation of cutting and opening the top surface (16) of the carton (10) can be performed with a force sufficient to cut only one layer of the perforation in all parts, making the opening operation easy and stable.

[0092] In addition, a tearable circular perforation (24) provided in the front body portion (12) can be cut away, for example by pushing this portion in the direction of the arrow (30), to form a circular opening (18).

[0093] FIG. 9 is a schematic perspective view illustrating a state in the middle of forming a slope in one embodiment of a carton for a bag-in-carton according to the present invention.

[0094] Continuing from the state shown in FIG. 8, by pulling the two-layered gripping portion of flaps (D) and (C) further forward in the direction of arrow (31), it is possible to cut the perforations (25) along the ridges between the front body portion (12) and both left and right body portions from the upper end of the front body portion (12) to both ends of fold line (e).

[0095] Next, fold line (b) of flap (B) is folded diagonally downward in the direction of arrow (32), and the diagonal fold lines (f) on both left and right sides of the body that continue from both ends of fold line (e) serve as the hypotenuses. The right-angled triangular area formed by the diagonal fold lines (f) and the perforations (25) and (26) that continue from these are then folded inward into the carton (10) at the diagonal fold line (f) in the direction of arrow (33).

[0096] Also, a circular opening (18) is formed, the concave notch (38) on the front side of the flap (B) is fitted into and fixed to a groove in the base portion of the spout (51), and the tip of the spout (51) is pulled out from the circular opening (18) to be exposed.

[0097] FIG. 10 is a perspective (partially see-through) schematic diagram illustrating one embodiment of a carton for a bag-in-carton according to the present invention, in which the carton is made into a seven-sided shape with a slope, the spout is pulled out and fixed in place, and the liquid content can be poured out.

[0098] Next, a slope (17) having a circular opening (18) and descending forward is formed between the top surface (16) and the upper part of the front body part (12) between the fold lines (d) and (e), and The part above fold line (d) is placed over the top surface (16), and the tabs (35) and (36) are folded at right angles along fold lines (h) and (g) provided on each tab, and then inserted and fixed into a slit (37) that passes through the paper in the center of the ridge between the flap (A) and the rear body portion (15).

[0099] In this way, according to the present invention, the carton (10) can be transformed into a seven-sided shape, with the newly formed slope (17) added to the six-sided shape of the initial assembled state, so that the liquid contents can be poured out.

[0100] This series of operations can be easily and steadily performed using fingers, since tearing can be done with the force of only one layer of perforation and all folding can be done using the fold lines.

[0101] FIG. 11 is a schematic plan view of a carton blank for explaining details of one embodiment of the invention, particularly as set forth in claim 2, in a bag-in-carton carton according to the present invention.

[0102] In the bag-in-carton carton of the present invention, the carton is first made into a hexahedron, and then when it is opened to be transformed into a heptahedron, the outermost flaps (D) and (C) are opened by pulling up the tab while still stacked. In addition to the examples shown in Figures 3 to 10, other embodiments are also possible for the cut lines and perforations around the tabs of the flaps (D) and (C).

[0103] In the example shown in Figure 11, the flap (C) has a tab portion (36) starting at the center of its tip, and two vertical perforations (20) form the left and right ends of the tab portion (36), and cut lines (27) are continuous with the end points of the perforations (20) and open in a V-shape to reach the left and right ends of the flap (C).

[0104] In addition, flap (D) has a tab portion (35) in the same position as flap (C), and has two pre-cut lines (22) that form the left and right ends of tab portion (35), and a "V-shaped" perforation (23) in the same position as flap (C).

[0105] That is, in this embodiment, the shape of the gripping portion and its surroundings of the outermost flap (D) and flap (C) is such that the gripping portion is two straight lines in the center of the end or tip, and a "V-shape" is formed continuous to these, and when flap (D) and flap (C) are overlapped, they are in the same position and have the same shape.

[0106] However, the part of the flap (D) that is the pre-cut line is a perforation in the flap (C), and the part of the flap (D) that is the perforation overlaps as a pre-cut line in the flap (C). Therefore, when trying to open the package by pulling up the tab to tear off the end and base of the tab, only the force of the perforation layer is required, making it possible to open the package easily and stably.

[0107] FIG. 12 is a schematic plan view of a carton blank for explaining details of one embodiment of the invention, particularly as set forth in claim 3, in a bag-in-carton carton according to the present invention.

[0108] In the bag-in-carton carton of the present invention, the carton is first made into a hexahedron, and then when it is opened to be transformed into a heptahedron, the outermost flaps (D) and (C) are opened by pulling up the tab while still stacked. In addition to the example shown in Figure 11, other embodiments are also possible for the cut lines and perforations around the tabs of flaps (D) and (C).

[0109] The example shown in Figure 12 differs from the example shown in Figure 11 in that the flap (C) has a tab portion (36) beginning at the center of its tip, and is formed in a shape in which two vertical cut lines (40) form the left and right ends of the tab portion (36), and perforations (41) open in a V-shape that continues to the end points of the cut lines (40) and reaches both side ends of the flap (C).

[0110] In addition, flap (D) has a tab portion (35) in the same position as flap (C), with two stitches (42) forming both the left and right ends of tab portion (35), and a V-shaped pre-cut line (43) in the same position as flap (C).

[0111] That is, in this embodiment, as in the example shown in Figure 11, the shape of the gripping portion and its surroundings of the outermost flaps (D) and (C) is such that the gripping portion is two straight lines in the center of the end or tip, and a "V-shape" is formed continuing from these, and when flaps (D) and (C) are overlapped, they are in the same position and have the same shape.

[0112] However, the part of the flap (D) that is the pre-cut line is a perforation in the flap (C), and the part of the flap (D) that is the perforation overlaps as a pre-cut line in the flap (C). Therefore, when trying to open the package by pulling up the tab to tear off the end and base of the tab, only the force of the perforation layer is required, making it possible to open the package easily and stably.

[0113] In this way, according to the present invention, a carton for a bag-in-carton is capable of accommodating a wrap-around packaging format, and in its initial state is a six-sided carton, and when opening it, part of the carton is opened, and the spout of the inner bag is pulled out to the outside of the paper container and fixed in place, forming a seven-sided carton with an added slope.In this carton, it is possible to provide a carton for a bag-in-carton that is easy to open and has a spout fixed, and the butt line between the flaps is not visible on the top surface, making it excellent in appearance. [Explanation of symbols]

[0114] 1...Arrow 2...Arrow 3... Arrows 4... Arrows 5...Arrows 6... Arrows 7. Arrow 8. Boundary 9. Blank 10··carton 11 Bottom 12...Front body 13 Left side torso 14...Right side torso 15 Rear torso 16 Top 17. Slope 18...Opening 20... Perforation 21... Pre-cut line 22 Pre-cut line 23... Perforation 24...Circular perforations 25... Perforation 26... Perforation 27 Pre-cut line 29...Arrow 30...Arrow 31...Arrow 32...Arrow 33...Arrow 34...Arrow 35···Knob part 36···Knob part 37 Slit 38... Concave cut 40···Pre-cut line 41... Perforation 42 Pre-cut line 43... Perforation 50...Inner bag 51···Spout 100 bags in carton A···Flap B···Flap C···Flap D···Flap a fold line b fold line c... Fold line d fold line e···Fold line f Diagonal fold line g···Fold line h···Fold line

Claims

1. A carton for a bag-in-carton, which is composed of a carton that is a paper outer box and an inner bag made of a plastic film as a base material, The inner bag has a spout and is capable of storing liquid, The spout is made of a molded plastic product and has a groove at its base for fixing it to the opening when the carton is opened. The carton is made in such a way that the inner bag is covered from the outside. In the initial state after being manufactured, the carton has an external shape that is a rectangular parallelepiped with four sides (back, right, front, and left) and a top and bottom, for a total of six sides. The four sides of the body are hollow rectangular prisms that surround the inner bag. The top surface of the carton is made up of four flaps (A), (B), (C), and (D) that are connected upward from the four sides of the body of the carton: the back, right side, front, and left side. The innermost layer of the top surface has a flap (A) that continues from the rear body and is folded at a right angle from the back to the front. A slit is formed through the paper at the center of the ridge between the flap (A) and the rear body. The flap (B) continuing from the right side body part is overlapped with the flap (A) and folded at a right angle to the top surface, The flap (B) has a fold line (b) in the height direction near the center, and the front edge of the flap (B) has a concave notch. The flap (C) continuing from the front body part is folded over the flap (B) at a right angle to the top surface. The flap (C) has a tab starting at the center of its tip, with two vertical perforations forming both left and right ends of the tab, and further, continuing downward from the end point, a pre-cut line is formed that allows both side ends of the tab to be cut off; The flap (C) has a fold line (c) in the width direction between the ridge line between the front body portion and the tab portion, A flap (D) continuing from the left side body part is folded at a right angle over the flap (C) to cover the outermost layer of the top surface; When the flap (D) overlaps with the flap (C), the flap (D) has a tab at the same position as the flap (C), and two cut lines are formed to form both the left and right ends of the tab. Furthermore, perforations are formed in a shape that continues from the end points of the cut lines and opens in a V-shape to reach both ends of the flap (D). A fold line (d) is provided on this flap (D) between the lower end of the "V-shape" and the front edge of the flap (D) at a position where the fold line (d) overlaps with the fold line (c) of the flap (C), There is a circular perforation at the top of the front body that can be cut out. Below this circular perforation, a fold line (e) is provided in the width direction of the front body part from ridge line to ridge line, From the top end of the front body to both ends of the fold line (e), perforations are provided on the ridges between the front body and both left and right body parts. Diagonal fold lines are provided on each of the left and right torsos from both ends of the fold line (e) to the center of each ridge of the left torso and flap (D) and the right torso and flap (B); Further, perforations are provided on the ridges of the left side body portion and the flap (D) and the right side body portion and the flap (B) that continue from the end point of the oblique fold line toward the front body portion, The bottom of the carton is formed by folding and stacking the flaps that connect downward from the four sides of the body: the back, right side, front and left side. This makes it possible to construct a rectangular parallelepiped carton with a total of six sides in its initial state after the inner bag is enclosed and boxed. When opening this bag-in-carton carton and taking out the liquid content stored in the inner bag, The stacked tabs of the top flaps (C) and (D) of the carton are grasped with the fingers to lift up the two layers together, and the carton is opened by tearing the perforations in the "V-shaped" portions of the tabs and the flap (D). Cut the perforations along the ridges between the front body and both left and right body sections from the top end of the front body to both ends of the fold line (e), Further pull the tab towards the front and fold the flap (B) diagonally downward along the fold line (b). The diagonal fold lines of the left and right body parts extending from both ends of the fold line (e) are used as hypotenuses, and the right-angled triangular areas formed by the diagonal fold lines and the perforations extending from the diagonal fold lines are folded inward toward the inside of the carton. Also, cutting the releasable circular perforation to form a circular opening; The concave slit of the flap (B) is fitted into a groove at the base of the spout and fixed, and the tip of the spout is pulled out from the circular opening to be exposed, Next, a slope having a circular opening and descending forward is formed between the top surface and the upper part of the front body between the fold line (d) and the fold line (e); Furthermore, the upper part of the fold line (d) is placed over the top surface, and the tab part is folded at a right angle along the fold line provided on the tab part, and is inserted into a slit that penetrates the paper at the center of the ridge between the flap (A) and the rear body part, and fixed; The carton is now a 7-sided shape with the newly formed slope added to the initial 6-sided shape. A carton for a bag-in-carton, characterized in that it can be transformed into a state in which the liquid content can be poured out.

2. A carton for a bag-in-carton, which is composed of a carton that is a paper outer box and an inner bag made of a plastic film as a base material, The inner bag has a spout and is capable of storing liquid, The spout is made of a molded plastic product and has a groove at its base for fixing it to the opening when the carton is opened. The carton is made in such a way that the inner bag is covered from the outside. In the initial state after being manufactured, the carton has an external shape that is a rectangular parallelepiped with four sides (back, right, front, and left) and a top and bottom, for a total of six sides. The four sides of the body are hollow rectangular prisms that surround the inner bag. The top surface of the carton is made up of four flaps (A), (B), (C), and (D) that are connected upward from the four sides of the body of the carton: the back, right side, front, and left side. The innermost layer of the top surface has a flap (A) that continues from the rear body and is folded at a right angle from the back to the front. A slit is formed through the paper at the center of the ridge between the flap (A) and the rear body. The flap (B) continuing from the right side body part is overlapped with the flap (A) and folded at a right angle to the top surface, The flap (B) has a fold line (b) in the height direction near the center, and the front edge of the flap (B) has a concave notch. The flap (C) continuing from the front body part is folded over the flap (B) at a right angle to the top surface. When the flap (D) and the flap (C) overlap on the top surface, The flap (C) has a tab starting at the center of its tip, two vertical cut lines that form the left and right ends of the tab, and furthermore, continuing to the end points of the cut lines, the perforations open in a "V-shape" and reach both ends of the flap (C). The flap (C) has a fold line (c) in the width direction between the ridge line between the front body portion and the tab portion, A flap (D) continuing from the left side body part is folded at a right angle over the flap (C) to cover the outermost layer of the top surface; The flap (D) has a tab at the same position as the flap (C), two perforations that form both the left and right ends of the tab, and a "V-shaped" pre-cut line that continues from the end of the perforations and is at the same position as the flap (C); A fold line (d) is provided on this flap (D) between the lower end of the "V-shape" and the front edge of the flap (D) at a position where the fold line (d) overlaps with the fold line (c) of the flap (C), There is a circular perforation at the top of the front body that can be cut out. Below this circular perforation, a fold line (e) is provided in the width direction of the front body part from ridge line to ridge line, From the top end of the front body to both ends of the fold line (e), perforations are provided on the ridges between the front body and both left and right body parts. Diagonal fold lines are provided on each of the left and right torsos from both ends of the fold line (e) to the center of each ridge of the left torso and flap (D) and the right torso and flap (B); Further, perforations are provided on the ridges of the left side body portion and the flap (D) and the right side body portion and the flap (B) that continue from the end point of the oblique fold line toward the front body portion, The bottom of the carton is formed by folding and stacking the flaps that connect downward from the four sides of the body: the back, right side, front and left side. This makes it possible to construct a rectangular parallelepiped carton with a total of six sides in its initial state after the inner bag is enclosed and boxed. When opening this bag-in-carton carton and taking out the liquid content stored in the inner bag, The stacked tabs of the top flaps (C) and (D) of the carton are grasped with the fingers to lift up the two layers together, and the two perforations of the tab and the flap (D) are cut to open the carton. Cut the perforations along the ridges between the front body and both left and right body sections from the top end of the front body to both ends of the fold line (e), Further pull the tab towards the front and fold the flap (B) diagonally downward along the fold line (b). The diagonal fold lines of the left and right body parts extending from both ends of the fold line (e) are used as hypotenuses, and the right-angled triangular areas formed by the diagonal fold lines and the perforations extending from the diagonal fold lines are folded inward toward the inside of the carton. Also, cutting the releasable circular perforation to form a circular opening; The concave slit of the flap (B) is fitted into a groove at the base of the spout and fixed, and the tip of the spout is pulled out from the circular opening to be exposed, Next, a slope having a circular opening and descending forward is formed between the top surface and the upper part of the front body between the fold line (d) and the fold line (e); Furthermore, the upper part of the fold line (d) is placed over the top surface, and the tab part is folded at a right angle along the fold line provided on the tab part, and is inserted into a slit that penetrates the paper at the center of the ridge between the flap (A) and the rear body part, and fixed; The carton is now a 7-sided shape with the newly formed slope added to the initial 6-sided shape. A carton for a bag-in-carton, characterized in that it can be transformed into a state in which the liquid content can be poured out.

3. A carton for a bag-in-carton, which is composed of a carton that is a paper outer box and an inner bag made of a plastic film as a base material, The inner bag has a spout and is capable of storing liquid, The spout is made of a molded plastic product and has a groove at its base for fixing it to the opening when the carton is opened. The carton is made in such a way that the inner bag is covered from the outside. In the initial state after being manufactured, the carton has an external shape that is a rectangular parallelepiped with four sides (back, right, front, and left) and a top and bottom, for a total of six sides. The four sides of the body are hollow rectangular prisms that surround the inner bag. The top surface of the carton is made up of four flaps (A), (B), (C), and (D) that are connected upward from the four sides of the body of the carton: the back, right side, front, and left side. The innermost layer of the top surface has a flap (A) that continues from the rear body and is folded at a right angle from the back to the front. A slit is formed through the paper at the center of the ridge between the flap (A) and the rear body. The flap (B) continuing from the right side body part is overlapped with the flap (A) and folded at a right angle to the top surface, The flap (B) has a fold line (b) in the height direction near the center, and the front edge of the flap (B) has a concave notch. The flap (C) continuing from the front body part is folded over the flap (B) at a right angle to the top surface. When the flap (D) and the flap (C) overlap on the top surface, The flap (C) has a tab starting at the center of its tip, two vertical perforations that form both the left and right ends of the tab, and a cut line that continues to the end of the perforations opens in a V-shape and reaches both ends of the flap (C). The flap (C) has a fold line (c) in the width direction between the ridge line between the front body portion and the tab portion, A flap (D) continuing from the left side body part is folded at a right angle over the flap (C) to cover the outermost layer of the top surface; The flap (D) has a tab portion at the same position as the flap (C), and two pre-cut lines that form both the left and right ends of the tab portion, and further, a "V-shaped" perforation is formed continuing from the end points of the pre-cut lines at the same position as the flap (C); A fold line (d) is provided on this flap (D) between the lower end of the "V-shape" and the front edge of the flap (D) at a position where the fold line (d) overlaps with the fold line (c) of the flap (C), There is a circular perforation at the top of the front body that can be cut out. Below this circular perforation, a fold line (e) is provided in the width direction of the front body part from ridge line to ridge line, From the top end of the front body to both ends of the fold line (e), perforations are provided on the ridges between the front body and both left and right body parts. Diagonal fold lines are provided on each of the left and right torsos from both ends of the fold line (e) to the center of each ridge of the left torso and flap (D) and the right torso and flap (B); Further, perforations are provided on the ridges of the left side body portion and the flap (D) and the right side body portion and the flap (B) that continue from the end point of the oblique fold line toward the front body portion, The bottom of the carton is formed by folding and stacking the flaps that connect downward from the four sides of the body: the back, right side, front and left side. This makes it possible to construct a rectangular parallelepiped carton with a total of six sides in its initial state after the inner bag is enclosed and boxed. When opening this bag-in-carton carton and taking out the liquid content stored in the inner bag, The stacked tabs of the top flaps (C) and (D) of the carton are grasped with the fingers to lift up the two layers together, and the carton is opened by tearing the perforations in the "V-shaped" portions of the tabs and the flap (D). Cut the perforations along the ridges between the front body and both left and right body sections from the top end of the front body to both ends of the fold line (e), Further pull the tab towards the front and fold the flap (B) diagonally downward along the fold line (b). The diagonal fold lines of the left and right body parts extending from both ends of the fold line (e) are used as hypotenuses, and the right-angled triangular areas formed by the diagonal fold lines and the perforations extending from the diagonal fold lines are folded inward toward the inside of the carton. Also, cutting the releasable circular perforation to form a circular opening; The concave slit of the flap (B) is fitted into a groove at the base of the spout and fixed, and the tip of the spout is pulled out from the circular opening to be exposed, Next, a slope having a circular opening and descending forward is formed between the top surface and the upper part of the front body between the fold line (d) and the fold line (e); Furthermore, the upper part of the fold line (d) is placed over the top surface, and the tab part is folded at a right angle along the fold line provided on the tab part, and is inserted into a slit that penetrates the paper at the center of the ridge between the flap (A) and the rear body part, and fixed; The carton is now a 7-sided shape with the newly formed slope added to the initial 6-sided shape. A carton for a bag-in-carton, characterized in that it can be transformed into a state in which the liquid content can be poured out.

4. 4. The carton for a bag-in-carton according to claim 1, wherein, among the flaps constituting the bottom surface, the flap arranged in the outermost layer has a size sufficient to cover the bottom surface.

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