Paper containers

Abstract

In order to obtain a gable-top type paper container with which it is possible to achieve easy stacking and storage space-saving during transportation or the like, a paper container 1 is formed of a carton blank 2 having side forming panels 15, 16, which are provided with foldout oblique guidelines 24 that connect a middle point A of a second top seal transverse folding line 20 to both ends B of a second apex transverse folding line 14, the carton blank 2 being configured such that the angle θ1 between the foldout oblique guidelines 24 and the second apex transverse folding line 14 provided on the side forming panels 15, 16 is 45 to 46 degrees, inclusive.

Description

[Technical Field]

[0001] The present invention relates to a paper container for containing liquid contents. [Background technology]

[0002] Conventionally, a paper container for storing liquid contents such as milk or juice has been made of a paperboard material with a thermoplastic resin laminated on the front and back surfaces thereof, and has a body front panel, body left and right side panels, and body back panel, which are connected via a body vertical fold line to form a rectangular tubular body. The top of the paper container has a pair of top forming panels connected to the body front panel and the body back panel via a first top horizontal fold line, a pair of side forming panels connected to the body left and right side panels via a second top horizontal fold line, a pair of outer top seal panels connected to the upper ends of the pair of top forming panels via a first top seal horizontal fold line, and a pair of side forming panels connected to the upper ends of the pair of top forming panels via a first top seal horizontal fold line. A paper container is widely used which has a top formed from a carton blank having a pair of inner top seal panels connected to the upper end of a face forming panel via a second top seal horizontal fold line, the pair of top forming panels and the pair of side forming panels connected to each other via a top vertical fold line, the pair of side forming panels having an inclined folding line connecting the midpoint of the second top seal horizontal fold line to both ends of the second top horizontal fold line, the pair of side forming panels being folded between the pair of top forming panels, and the outer top seal panel and inner top seal panel being sealed (see, for example, Patent Document 1).

[0003] Paper containers with tops formed in this way are generally called gable-top or gable-roof types, and the top surface that forms the top is steeply inclined. Therefore, when trying to stack a large number of paper containers and store them in a box, for example during transportation, the bottom of the upper paper container rests on the steeply inclined top of the lower paper container, making it unstable and difficult to stack the paper containers. Furthermore, even if they are stacked, a large space will be created between the upper and lower paper containers, resulting in an unnecessarily large volume of the storage box that stores the paper containers.

[0004] To solve this problem, it is desirable to make the side edges of the top surface forming panel that forms the top of the paper container parallel to or at an angle close to parallel to the upper edge of the body forming panel that forms the tubular body. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Publication No. 2019-123540 Summary of the Invention [Problem to be solved by the invention]

[0006] However, it has been considered difficult to manufacture the paper container so that the side edge of the top surface forming panel that forms the top of the paper container and the upper edge of the body forming panel that forms the tubular body are parallel or at an angle close to parallel.

[0007] The inventors conducted extensive testing and research to ensure that the side edges of the top forming panel of a paper container and the upper edges of the body forming panels are parallel or at an angle close to parallel. As a result, they found that by focusing, during the design stage of the carton blanks, on the angle between the slanted fold line on the pair of side forming panels and the second top horizontal fold line between the side forming panels and the left and right side panels of the body, the ratio of the length from the bottom end of the outer top seal panel to the second top horizontal fold line, and the thickness of the paperboard material, and specifying the angle between the slanted fold line and the second top horizontal fold line, the ratio of the length from the bottom end of the outer top seal panel to the second top horizontal fold line, and the position of the first top horizontal fold line relative to the second top horizontal fold line, they were able to ensure that the side edges of the top forming panel that forms the top of a paper container and the upper edges of the body forming panels that form the tubular body are parallel or at an angle close to parallel, thereby completing the present invention.

[0008] An object of the present invention is to provide a paper container having a gable-top type top structure, which can be easily stacked during transportation and can save space when stored. [Means for solving the problem]

[0009] In order to achieve the above object, the invention described in claim 1 is a square tubular body made of a paperboard material laminated with a thermoplastic resin on both sides, the body having a body front panel, body left and right side panels, and body back panel connected via a body vertical fold line, the top of the body having a pair of top forming panels connected to the body front panel and the body back panel via a first top horizontal fold line, a pair of side forming panels connected to the body left and right side panels via a second top horizontal fold line, a pair of outer top seal panels connected to upper ends of the pair of top forming panels via a first top seal horizontal fold line, and a pair of inner top seal panels connected to upper ends of the pair of side forming panels via a second top seal horizontal fold line, the pair of top forming panels and the pair of top forming panels having a thickness of 100 μm. The side forming panels are connected to each other via a top vertical fold line, and the pair of side forming panels are provided with a fold inclined crease that connects the midpoint of the second top seal horizontal fold line to both ends of the second top horizontal fold line. The pair of side forming panels are folded between the pair of top forming panels, and the outer top seal panel and the inner top seal panel are sealed to form a top. In this paper container, in the carton blank, the angle θ between the fold inclined crease that is provided on the pair of side forming panels and the second top horizontal fold line is 45 degrees or more and 46 degrees or less, and the first top horizontal fold line is located above the second top horizontal fold line at a distance of 2 to 4 times the paper thickness of the paperboard material. A gap corresponding to a length of 2 to 4 times the thickness of the paper is formed between the side edges of the pair of top surface forming panels that form the top and the upper edges of the left side panel of the body and the upper edges of the right side panel of the body. It is characterized by the fact that

[0010] According to the invention of claim 1, in the carton blank, the angle θ between the slanted folding line on the pair of side forming panels and the second top horizontal fold line is between 45 degrees and 46 degrees, so that the side edges of the top forming panel that form the top surface of the top and the upper edges of the body forming panel are parallel or nearly parallel, i.e., the angle between the side edges of the top forming panel and the body forming panel is 0 degrees or nearly 0 degrees, resulting in a paper container with a generally flat top surface. Furthermore, in the carton blank, the first top horizontal fold line is located above the second top horizontal fold line by 2 to 4 times the thickness of the paperboard material. Therefore, when the pair of top forming panels are folded in opposite directions from the first top horizontal fold line so as to fold the pair of side forming panels between them, resistance to folding caused by the folding portion overlapping the upper surfaces of the pair of lower side forming panels can be effectively prevented. Furthermore, a gap corresponding to a length 2 to 4 times the paper thickness of the paperboard material is formed between the side edges of the pair of top forming panels that form the top and the upper edges of the left side panel and right side panel of the body. Therefore, when stacking paper containers, the top seal portion formed by sealing the outer top seal panel and the inner top seal panel of the lower paper container is tilted down, and a paper container is placed on top of it. The weight of the upper paper container causes the top of the lower paper container to elastically deform the paperboard material, pushing the tilted top seal portion into the gap, and the top seal portion sinks below the folding portion of the top forming panel that is bent from the first top horizontal fold line. This makes it possible to stack paper containers stably in a single vertical row, further saving storage space. can.

[0011] The invention described in claim 2 is a box made of a paperboard material having a thermoplastic resin laminated on both sides thereof, the box having a body front panel, body left and right side panels, and body back panel connected via a body vertical fold line to form a rectangular tubular body, the box having a top, a pair of top forming panels connected to the body front panel and the body back panel via a first top horizontal fold line, a pair of side forming panels connected to the body left and right side panels via a second top horizontal fold line, a pair of outer top seal panels connected to upper ends of the pair of top forming panels via a first top seal horizontal fold line, and a pair of inner top seal panels connected to upper ends of the pair of side forming panels via a second top seal horizontal fold line, the pair of top forming panels and the pair of side forming panels being spaced apart from each other by the top vertical fold line. a paper container formed from carton blanks in which the pair of side forming panels are connected to each other via a second top seal horizontal fold line, and the pair of side forming panels are provided with a slanted folding line connecting the midpoint of the second top seal horizontal fold line to both ends of the second top horizontal fold line, and the pair of side forming panels are folded between the pair of top forming panels to seal the outer top seal panel and the inner top seal panel, thereby forming a top 2; in the carton blanks, the length from the lower end of the outer top seal panel to the second top horizontal fold line is at least 1 / 2 the length of the second top horizontal fold line but not more than 1 / 2 the length of the second top horizontal fold line plus half the paper thickness of the paperboard material, and the first top horizontal fold line is located above the second top horizontal fold line at a distance of 2 to 4 times the paper thickness of the paperboard material A gap corresponding to a length of 2 to 4 times the thickness of the paper is formed between the side edges of the pair of top surface forming panels that form the top and the upper edges of the left side panel of the body and the upper edges of the right side panel of the body. It is characterized by the fact that

[0012] According to the invention described in claim 2, in the carton blanks, the length from the lower end of the outer top seal panel to the second top horizontal fold line is at least 1 / 2 the length of the second top horizontal fold line and is not more than 1 / 2 the length of the second top horizontal fold line plus half the paper thickness of the paperboard material.Therefore, in the formed paper container, the side edges of the top forming panel that form the top surface of the top and the upper edge of the body forming panel are parallel or nearly parallel, i.e., the angle between the side edges of the top forming panel and the body forming panel is 0 degrees or nearly 0 degrees, resulting in a paper container with a generally flat top surface. In addition, in the carton blank, the first top horizontal fold line is located above the second top horizontal fold line and is 2 to 4 times the paper thickness of the paperboard material. Therefore, when the pair of top forming panels are folded in opposite directions from the first top horizontal fold line so as to fold the pair of side forming panels in between, resistance to folding caused by the folding portions overlapping the upper surfaces of the pair of lower side forming panels can be effectively prevented. Furthermore, a gap corresponding to a length 2 to 4 times the paper thickness of the paperboard material is formed between the side edges of the pair of top forming panels that form the top and the upper edges of the left side panel and right side panel of the body. Therefore, when stacking paper containers, the top seal portion formed by sealing the outer top seal panel and the inner top seal panel of the lower paper container is tilted down, and a paper container is placed on top of it. The weight of the upper paper container causes the top of the lower paper container to elastically deform the paperboard material, pushing the tilted top seal portion into the gap, and the top seal portion sinks below the folding portion of the top forming panel that is bent from the first top horizontal fold line. This makes it possible to stack paper containers stably in a single vertical row, further saving storage space. can. [Effects of the Invention]

[0015] As described above, the paper container according to the present invention can have a generally flat top surface, which makes it easy to stack during storage and transportation and saves space required for storage. [Brief explanation of the drawings]

[0016] [Figure 1] 1 is a perspective view showing a first example of an embodiment of a paper container according to the present invention. [Figure 2] FIG. 2 is a plan view showing a carton blank for forming the paper container shown in FIG. [Figure 3] FIG. 3 is an enlarged explanatory view of a portion of the carton blank shown in FIG. 2. [Figure 4] 3 is an explanatory view showing the top surface of the top portion of the paper container shown in FIG. 1 formed from the carton blanks of FIG. 2. FIG. [Figure 5] FIG. 2 is an explanatory diagram showing an example of stacking the paper containers of the first example. [Figure 6]FIG. 10 is an explanatory diagram showing another example of stacking the paper containers of the first example. [Figure 7] FIG. 2 is a plan view showing a carton blank forming a second example of an embodiment of a paper container according to the present invention. [Figure 8] FIG. 8 is an enlarged explanatory view of a portion of the carton blank shown in FIG. 7. DETAILED DESCRIPTION OF THE INVENTION

[0017] Hereinafter, an embodiment of a paper container according to the present invention will be described in detail with reference to the drawings. Figures 1 to 6 show a first example of an embodiment of a paper container according to the present invention, where Figure 1 is an oblique view of the paper container of the first example, Figure 2 is a plan view of the carton blank of the paper container shown in Figure 1, Figure 3 is an enlarged explanatory view of a portion of the carton blank shown in Figure 2, Figure 4 is an explanatory view showing the top surface of the top of the paper container shown in Figure 1 formed from the carton blank of Figure 2, Figure 5 is an explanatory view showing an example of stacking paper containers of the first example, and Figure 6 is an explanatory view showing another example of stacking paper containers of the first example.

[0018] The paper container 1 of the first example is formed from a carton blank 2, which is a paperboard material with a thermoplastic resin laminated on the front and back surfaces as shown in Figure 2. The carton blank 2 has a body front panel 4, a body left side panel 5, a body right side panel 6, and a body back panel 7, which are connected via a body vertical fold line 3.

[0019] When the paper container 1 is formed, the body front panel 4, body left side panel 5, body right side panel 6, and body back panel 7 are joined to the vertical seal panel 8 connected to the body right side panel 6 via the body vertical fold line 3, and the edge 9 of the body back panel 7, to form a square tubular body 10 of the paper container 1.

[0020] The upper ends of the front body panel 4 and the back body panel 7 have a pair of top forming panels 12, 13 connected via a first top horizontal fold line 11, and the upper ends of the left body side panel 5 and the right body side panel 6 have a pair of side forming panels 15, 16 connected via a second top horizontal fold line 14.

[0021] The top forming panels 12, 13 have a pair of outer top seal panels 18, 19 connected to their upper ends via a first top seal horizontal fold line 17, and the side forming panels 15, 16 have a pair of inner top seal panels 21, 22 connected to their upper ends via a second top seal horizontal fold line 20. The top forming panels 12, 13 and the side forming panels 15, 16 are connected to each other via a top vertical fold line 23.

[0022] In addition, the pair of side forming panels 15, 16 are provided with inclined folding lines 24 for folding the side forming panels 15, 16, which connect the midpoint A of the second top seal horizontal fold line 20 to both end portions B of the second top horizontal fold line 14.

[0023] When forming the paper container 1, the side forming panels 15, 16 are folded between the top forming panels 12, 13, and the outer top seal panels 18, 19 and the inner top seal panels 21, 22 are sealed to form a gable top 25 as shown in Figure 1.

[0024] In the carton blank 2 configured as described above, the angle θ1 between the slanted folding line 24 formed on the pair of side forming panels 15, 16 and the second top horizontal fold line 14 is between 45 degrees and 46 degrees.

[0025] The angle θ1 is determined as the angle at which the side edge 25b of the top surface 25a of the top 25 of the formed paper container 1 and the upper edge 10a of the tubular body 10 are parallel or nearly parallel, i.e., the angle θ2 between the side edge 25b of the top surface 25a of the top 25 and the upper edge 10a of the tubular body 10 is 0 degrees or nearly 0 degrees.

[0026] Furthermore, in the first example, the first top horizontal fold line 11 is spaced above the second top horizontal fold line 14 by a length L1 that is two to four times the thickness of the paperboard material. The length L1 is determined to facilitate folding of the top surface forming panels 12, 13 from the first top horizontal fold line 11 and to obtain a flatter top surface 25a with less bulging at the folded portion.

[0027] In addition, in the first example, the lower ends of the front body panel 4 and the back body panel 7 have bottom forming panels 27, 28 connected via a first horizontal bottom fold line 26, and the lower ends of the left side body panel 5 and the right side body panel 6 have inner panels 30, 31 connected via a second horizontal bottom fold line 29.When the paper container 1 is formed, the inner panels 30, 31 are folded inside the bottom forming panels 27, 28 and the abutting surfaces are bonded together to form the bottom 32 of the paper container 1.

[0028] In the paper container 1 formed from the carton blanks 2 configured in this manner, the angle θ1 between the slanted folding line 24 formed on the pair of side forming panels 15, 16 and the second top horizontal fold line 14 in the carton blanks 2 forming the paper container 1 is between 45 degrees and 46 degrees, and therefore the formed paper container 1 has an angle such that the side edges 25b of the top forming panels 12, 13 that form the top surface 25a of the top 25 and the upper edges 10a of the left body side panel 5 and the right body side panel 6 that form the tubular body 10 are parallel or nearly parallel, i.e., the angle θ2 between the side edges 25b of the top forming panels 12, 13 and the upper edges 10a of the left body side panel 5 and the right body side panel 6 is 0 degrees or nearly 0 degrees, resulting in a paper container 1 having a generally flat top surface 25b (see Figures 1 and 4).

[0029] Therefore, when paper containers 1 are stacked so that they straddle the top surfaces of two adjacent lower paper containers 1, the bottom 32 of the upper paper container 1 is stacked stably on the top surface 25a formed by the top surface forming panels 12, 13 of the top 25, avoiding the top seal portion 33 of the lower paper container 1 (see Figure 5), and the space between the top 25 of the lower stacked paper container 1 and the bottom 32 of the upper stacked paper container 1 is reduced, allowing for space savings in storage.

[0030] The angle θ1 between the inclined folding line 24 formed on the side forming panels 15, 16 and the second top horizontal fold line 14 is 45 degrees. less than If this is the case, when forming the top 25, it becomes difficult to join the opposing surfaces of the opposing outer top seal panels 18, 19 and inner top seal panels 21, 22, making it impossible to ensure complete sealing of the outer top seal panels 18, 19 and inner top seal panels 21, 22, or the sealed outer top seal panels 18, 19 and inner top seal panels 21, 22 are more likely to be subjected to force in a direction that would cause the seal to peel off, which could result in the seal peeling off.

[0031] Also, the angle θ1 is 46 degrees Exceeding In this case, the angle θ2 formed by the side edge 25b of the top surface forming panels 12, 13 and the upper edge 10a of the left side panel 5 of the body and the right side panel 6 of the body becomes an angle that makes it difficult to obtain satisfactory stability for the paper container 1 stacked on top of the paper container 1, and also, there is no satisfactory space between the top 25 of the lower paper container 1 and the bottom 32 of the upper paper container 1 to save space in storage.

[0032] In addition, in the first example, the first top horizontal fold line 11 is located above the second top horizontal fold line 14 by a length L1 that is 2 to 4 times the thickness of the paperboard material. Therefore, when the top forming panels 12, 13 are folded in the opposite direction from the first top horizontal fold line 11 with the side forming panels 15, 16 folded in between, the resistance to bending caused by the top forming panels 12, 13 overlapping the upper surface of the lower side forming panels 15, 16 that overlap the bending portion C of the top forming panels 12, 13 that are folded from the first top horizontal fold line 11 is small, and the top forming panels 12, 13 can be easily folded from the first top horizontal fold line 11.

[0033] Furthermore, since the first top horizontal fold line 11 is located above the second top horizontal fold line 14 by a length L1 that is 2 to 4 times the thickness of the paperboard material, a gap D corresponding to the length L1 that is 2 to 4 times the thickness of the paperboard material is created between the side edges 25b of the top forming panels 12, 13 and the upper edges 10a of the left side panel 5 of the body and the right side panel 6 of the body (see Figure 4).

[0034] Therefore, when stacking paper containers 1, if the top seal portion 33 of the lower paper container 1 is tilted down and a paper container 1 is placed on top of it, the weight of the upper paper container 1 will cause the top surface 25a to elastically deform the paperboard material, pushing the tilted top seal portion 33 into the gap D, and the top seal portion 33 will sink below the folding portion C of the top surface forming panels 12, 13 that are folded from the first top horizontal fold line 11 (see Figure 6), making it possible to stack the paper containers 1 stably in a single vertical row, thereby further saving storage space.

[0035] The distance between the first top horizontal fold line 11 and the second top horizontal fold line 14 is twice the thickness of the paperboard material. less thanWith this length, the gap D formed between the side edges 25b of the top forming panels 12, 13 and the upper edges 10a of the left body side panel 5 and the right body side panel 6 is narrow, and when the top seal portion 33 of the lower paper container 1 is tilted down and a paper container 1 is stacked on top of it, the top seal portion 33 is pushed into the gap D by the weight of the upper paper container 1 and ends up above the folding portion C of the top forming panels 12, 13 that are folded from the first top horizontal fold line 11, making it difficult to stack the paper containers 1 stably in a single vertical row.

[0036] In addition, the distance between the first top horizontal fold line 11 and the second top horizontal fold line 14 is four times the thickness of the paperboard material. exceed If the length is long, the angle between the top surface forming panel 12 and the top surface forming panel 13 becomes large, and the deformation resistance strength of the top surface 25a becomes large, so it becomes difficult to knock down the top seal portion 33 of the lower paper container 1 and push the knocked down top seal portion 33 into the gap D due to the elastic deformation of the paperboard material of the top surface 25a due to the weight of the paper container 1 stacked on top of it, making it difficult to stack the paper containers 1 in a stable vertical row.

[0037] Figures 7 and 8 show a second example of an embodiment of a paper container according to the present invention, where Figure 7 is a plan view showing a carton blank that forms the paper container of the second example, and Figure 8 is an enlarged explanatory view of a portion of the carton blank shown in Figure 7.

[0038] In the paper container 1 of the second example, the same components as those in the first example are given the same reference numerals and their explanation will be omitted, and only the components different from those in the first example will be explained.

[0039] In the second example, in the carton blank 2, the length L2 from the lower end E of the outer top seal panel 18, 19, i.e., from the first top seal horizontal fold line 17 to the second top horizontal fold line 14, is at least 1 / 2 the length L3 of the second top horizontal fold line 14 and is not more than 1 / 2 the length L3 of the second top horizontal fold line plus half the paper thickness of the paperboard material.

[0040] The length L2 is determined as the length at which the side edge 25b of the top surface 25a of the top 25 of the formed paper container 1 and the upper edge 10a of the tubular body 10 are parallel or nearly parallel, i.e., the angle θ2 between the side edge 25b of the top surface 25a of the top 25 and the upper edge 10a of the tubular body 10 is 0 degrees or nearly 0 degrees.

[0041] Furthermore, in the second example, as in the first example, the first top horizontal fold line 11 is spaced above the second top horizontal fold line 14 by a length L1 that is two to four times the thickness of the paperboard material. As in the first example, the length L1 is determined to be a length that allows the top surface forming panels 12, 13 to be easily folded from the first top horizontal fold line 11 and to obtain a flatter top surface 25a with less bulge at the folding area C.

[0042] The paper container 1 formed from the carton blanks 2 configured in this manner has a length L2 from the lower end E of the outer top seal panels 18, 19, i.e., from the first top seal horizontal fold line 17 to the second top horizontal fold line 14, which is equal to or greater than half the length L3 of the second top horizontal fold line 14 and equal to or less than half the length L3 of the second top horizontal fold line plus half the thickness of the paperboard material. Therefore, the formed paper container 1 has a length L2 from the lower end E of the outer top seal panels 18, 19 to the second top horizontal fold line 14, which is equal to or greater than half the length L3 of the second top horizontal fold line plus half the thickness of the paperboard material, as in the first example. The side edges 25b of the top forming panels 12, 13 that form the top surface 25a of the paper container 15 and the upper edges 10a of the left body side panel 5 and the right body side panel 6 that form the tubular body 10 are parallel or at an angle close to parallel, i.e., the angle θ2 between the side edges 25b of the top forming panels 12, 13 and the upper edges 10a of the left body side panel 5 and the right body side panel 6 is 0 degrees or close to 0 degrees, thereby obtaining a paper container 1 with a generally flat top surface 25a (Figures 1 and 4 are referenced).

[0043] Therefore, as in the first example, when a paper container 1 is stacked so that it straddles the top surfaces of two adjacent lower paper containers 1, the bottom 32 of the upper paper container 1 is stably stacked on the top surface 25a formed by the top surface forming panels 12, 13 of the top 25, avoiding the top seal portion 33 of the lower paper container 1, and the space between the top 25 of the lower stacked paper container 1 and the bottom 32 of the upper stacked paper container 1 is reduced, thereby enabling space saving in storage (Figure 5 cited).

[0044] The length L2 from the lower end E of the outer top seal panels 18, 19, i.e., the first top seal horizontal fold line 17 to the second top horizontal fold line 14, is 1 / 2 of the length L3 of the second top horizontal fold line 14. less than In this case, as in the first example, when forming the top 25, it becomes difficult to join the opposing surfaces of the opposing outer top seal panels 18, 19 and inner top seal panels 21, 22, making it impossible to ensure the integrity of the seal between the outer top seal panels 18, 19 and inner top seal panels 21, 22, or the sealed outer top seal panels 18, 19 and inner top seal panels 21, 22 are more likely to be subjected to force in a direction that would cause the seal to peel off, which could result in the seal peeling off.

[0045] In addition, the length L2 from the first top seal horizontal fold line 17 to the second top horizontal fold line 14 is 1 / 2 of the length L3 of the second top horizontal fold line + the thickness of the paperboard material / 2. Exceeding As a result, as in the first example, the angle θ2 formed by the side edges 25b of the top forming panels 12, 13 and the upper edges 10a of the left side panel 5 and the right side panel 6 of the body becomes an angle that makes it difficult to obtain satisfactory stability for the paper container 1 stacked on top of the paper container 1, and also, there is no satisfactory space between the top 25 of the lower paper container 1 and the bottom 32 of the upper paper container 1 to save space in storage.

[0046] In addition, in the second example, as in the first example, the first top horizontal fold line 11 is located above the second top horizontal fold line 14 by a length L1 that is 2 to 4 times the thickness of the paperboard material.Therefore, as in the first example, when the top forming panels 12, 13 are folded in the opposite direction from the first top horizontal fold line 11 with the side forming panels 15, 16 folded in between, the resistance to bending caused by the top forming panels 12, 13 overlapping the upper surface of the lower side forming panels 15, 16 that overlap the bending portion C of the top forming panels 12, 13 that are folded from the first top horizontal fold line 11 is small, and the top forming panels 12, 13 can be easily folded from the first top horizontal fold line 11.

[0047] Furthermore, since the first top horizontal fold line 11 is located above the second top horizontal fold line 14 by a length L1 that is 2 to 4 times the thickness of the paperboard material, as in the first example, a gap D corresponding to the length L1 that is 2 to 4 times the thickness of the paperboard material is created between the side edges 25b of the top forming panels 12, 13 and the upper edges 10a of the left side panel 5 of the body and the right side panel 6 of the body (see Figure 4).

[0048] Therefore, when stacking paper containers 1, if the top seal portion 33 of the lower paper container 1 is tilted down and a paper container 1 is placed on top of it, the weight of the upper paper container 1 causes the elastic deformation of the paperboard material of the top surface 25a, pushing the tilted top seal portion 33 into the gap D, and the top seal portion 33 sinks below the folding portion C of the top surface forming panels 12, 13 that are folded from the first top horizontal fold line 11 (see Figure 6), making it possible to stack the paper containers 1 stably in a single vertical row, thereby further saving storage space.

[0049] The distance between the first top horizontal fold line 11 and the second top horizontal fold line 14 is twice the thickness of the paperboard material. less than If the length is 100 mm, it will be difficult to stack the paper containers 1 stably in a single vertical row, as in the first example. In addition, if the distance between the first top horizontal fold line 11 and the second top horizontal fold line 14 is 4 times the thickness of the paperboard material, exceed If the length is too long, it will be difficult to stack the paper containers 1 stably in a single vertical row, as in the first example. [Explanation of symbols]

[0050] 1. Paper containers 2 Carton Blanks 3. Vertical fold line of the body 4. Front body panel 5 Left side panel of the fuselage 6 Right side panel of the fuselage 7. Back panel of the body 8 Vertical Seal Panels 9 Edge 10 Cylindrical body 10a Top 11 1st top horizontal fold line 12,13 Top forming panel 14 2nd top horizontal fold line 15,16 Side forming panels 17 First top seal horizontal fold line 18,19 Outer top seal panel 20 Second top seal horizontal fold line 21,22 Inner top seal panel 23 Top vertical fold line 24 Inclined folding lines 25 Top 25a top surface 25b side 26 1st bottom horizontal fold line 27,28 Bottom forming panel 29 2nd bottom horizontal fold line 30,31 Inner panel 32 Bottom 33 Top seal part

Claims

1. The bag is made of a paperboard material laminated with a thermoplastic resin on both sides, and has a body front panel, body left and right side panels, and body back panel connected via a body vertical fold line to form a rectangular tubular body. The bag also has a top forming panel connected to the body front panel and body back panel via a first top horizontal fold line, a pair of side forming panels connected to the body left and right side panels via a second top horizontal fold line, a pair of outer top seal panels connected to the upper ends of the pair of top forming panels via a first top seal horizontal fold line, and a pair of side forming panels. a pair of inner top seal panels connected to the upper ends of the carton blanks via a second top seal horizontal fold line, the pair of top forming panels and the pair of side forming panels being connected to each other via a top vertical fold line, and the pair of side forming panels being provided with slanted folding lines connecting the midpoint of the second top seal horizontal fold line to both ends of the second top horizontal fold line, and the pair of side forming panels are formed from carton blanks, the top of which is formed by folding the pair of side forming panels between the pair of top forming panels and sealing the outer top seal panel and the inner top seal panel together, In the carton blank, the angle θ between the fold-in inclined crease formed on the pair of side-forming panels and the second top horizontal fold line is 45 degrees or more and 46 degrees or less, The first top horizontal fold line is located above the second top horizontal fold line and is 2 to 4 times the paper thickness of the paperboard material, and a gap corresponding to a length 2 to 4 times the paper thickness is formed between the side edges of the pair of top forming panels that form the top and the upper edges of the left side panel and the right side panel of the body.

2. The bag is made of a paperboard material with a thermoplastic resin laminated on the front and back surfaces thereof, and has a body front panel, body left and right side panels, and body back panel, which are connected via a body vertical fold line to form a rectangular tubular body. The bag also has a top forming panel, which is connected to the body front panel and the body back panel via a first top horizontal fold line, a pair of side forming panels, which are connected to the body left and right side panels via a second top horizontal fold line, a pair of outer top seal panels, which are connected to the upper ends of the pair of top forming panels via a first top seal horizontal fold line, and a pair of side forming panels. a paper container formed from carton blanks having a pair of inner top seal panels connected at their upper ends via a second top seal horizontal fold line, the pair of top forming panels and the pair of side forming panels connected to each other via a top vertical fold line, and the pair of side forming panels having slanted folding lines connecting the midpoint of the second top seal horizontal fold line to both ends of the second top horizontal fold line, the pair of side forming panels being formed, and the pair of side forming panels being folded between the pair of top forming panels, and the outer top seal panel and the inner top seal panel being sealed, thereby forming a top 2; In the carton blank, the length from the lower end of the outer top seal panel to the second top horizontal fold line is at least 1 / 2 of the length of the second top horizontal fold line and is not more than 1 / 2 of the length of the second top horizontal fold line plus half the paper thickness of the paperboard material, The first top horizontal fold line is located above the second top horizontal fold line and is 2 to 4 times the paper thickness of the paperboard material, and a gap corresponding to a length 2 to 4 times the paper thickness is formed between the side edges of the pair of top forming panels that form the top and the upper edges of the left side panel and the right side panel of the body.

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