Web corner type paper container and blank therefor

Abstract

To prevent a plastic film from floating in a web corner type paper container having the plastic film stuck on its inner surface.SOLUTION: A web corner type paper vessel 10 is provided with a bonding area 5 for peelably bonding a cardboard 1 and a plastic film 2 and a side 5B. The bonding regions 5 are provided at a plurality of locations on each of the bottom plate 11 and the plurality of side plates 12 to 15, and are scattered at intervals of 12mm or more and 40mm or less between adjacent bonding regions 5 over the entire cardboard. The adhesive area 5B is provided on a folding piece 13a which is one of two adjacent folding pieces 15a and 15a forming the web corner part.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to web corner paper containers and blanks thereof. [Background technology]

[0002] A web-corner paper container with a peelable plastic film on the inside has been proposed (Patent Document 1). Web-corner paper containers are less likely to leak liquids such as oil, seasonings, and meat juices from the corners of the container. By attaching a plastic film to the inside, liquids do not seep into the paper container itself. After use, the plastic film can be peeled off from the paper container, and the parts can be separated and disposed of. The paper container proposed in Patent Document 1 is easy to use and environmentally friendly.

[0003] The plastic film must be firmly fixed (adhered) to the paper container from the time of manufacture to the time of use, yet be easily peelable when sorting. This is not easy with web-corner paper containers. Web-corner paper containers have web corners consisting of folds at the corners, and the folds are folded by making valley and mountain folds, generally overlapping three times. When the folds are mountain and valley folds, the plastic film overlapping the folds is likely to lift, and this can cause molding defects in the web corner. Furthermore, as mentioned above, the folds at the web corners overlap when folded, so the plastic film becomes sandwiched between the overlapping folds. To peel the plastic film from the web corner, the plastic film sandwiched between the overlapping folds must be pulled out. Peeling the plastic film from the web corner requires not only the force to peel it off the paper container, but also the force required to pull out the plastic film that is sandwiched between multiple folds. If the plastic film is strongly adhered to the folds to prevent it from lifting, it will not be possible to peel it off the web corner with a light force. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2007-145396 Summary of the Invention [Problem to be solved by the invention]

[0005] The object of this invention is to prevent the floating of a plastic film in a web-corner type paper container having a plastic film attached to the inner surface.

[0006] Another object of the present invention is to make it possible to easily peel off a plastic film from a web-corner type paper container having a plastic film attached to the inner surface.

[0007] The web corner paper container of this invention is made from a laminate consisting of cardboard and a plastic film that covers the entire inner surface of the cardboard and is partially peelably attached to the cardboard, and has a polygonal bottom plate, side plates that are connected to each edge of the bottom plate via fold lines and stand up from the bottom plate, and folded pieces that are connected to both sides of the side plate via fold lines and connected via fold lines extending outward from the corners of the bottom plate, and has a web corner portion where two adjacent folded pieces are pulled outward and folded and attached to the outer surface of the side plate.

[0008] The number of web corners a web corner paper container has varies depending on the shape of the polygonal bottom plate: if the bottom plate is square, the web corner paper container has four web corners, if the bottom plate is hexagonal, the web corner paper container has six web corners, and if the bottom plate is octagonal, the web corner paper container has eight web corners.

[0009] The web corner portion of a web corner type paper container has folded pieces that are connected to both sides of the side panel via fold lines and are connected via fold lines that extend outward from the corners of the bottom panel, and two adjacent folded pieces are pulled outward and folded and attached to the outer surface of the side panel. A total of three pieces of paper, including the paper pieces of the two folded pieces and the paper pieces of the side panel of the paper container to which they are attached, are overlapped at the web corner portion.

[0010] The web-corner paper container of this invention is made from a laminate consisting of cardboard and a plastic film peelably bonded to the entire inner surface of the cardboard, where the plastic film is not bonded to the entire inner surface of the cardboard but is bonded partially. In this invention, the bonded area where the plastic film is partially bonded is classified into a first bonding area and a second bonding area. That is, the web-corner paper container of this invention is provided with first and second bonding areas that peelably bond the cardboard and the plastic film, the first bonding areas are provided in multiple locations on each of the bottom plate and multiple side plates, and are scattered over the entire cardboard (excluding the fold-out pieces) with a gap of 12 mm to 40 mm between adjacent first bonding areas, and the second bonding area is provided on at least one of the two adjacent fold-out pieces that form the web corner portion.

[0011] The first adhesive area is an adhesive area that is evenly provided over the entire inner surface of the cardboard, and the fixation of the plastic film to the inner surface of the cardboard basically depends on this first adhesive area. The first adhesive area is provided in multiple locations on each of the bottom plate and multiple side plates that make up the paper container.

[0012] The first adhesive regions are also provided scattered throughout the cardboard with a gap of 12 mm to 40 mm between adjacent first adhesive regions. Narrowing the gap between adjacent first adhesive regions increases the number of first adhesive regions, while widening the gap increases the number of first adhesive regions. By ensuring a predetermined gap between the first adhesive regions, it is possible to prevent the first adhesive regions from being provided in a cluster or dispersed manner, for example.

[0013] According to this invention, in addition to the first adhesive region described above, a second adhesive region is provided on at least one of the two adjacent fold pieces that form the web corner portion. By providing the second adhesive region on the fold pieces, the plastic film can be firmly fixed to the fold pieces, making it less likely that the plastic film will lift and become wrinkled when the fold pieces are folded, and preventing poor molding of the web corner portion.

[0014] Preferably, the area of ​​the second adhesive region is 1 to 5% of the area of ​​the fold-out piece on which the second adhesive region is provided. By providing a second adhesive region with a relatively small area, it is possible to prevent the fold-out piece and the plastic film from being adhered more strongly than necessary, and to reduce the feeling of resistance when peeling the plastic film from the cardboard.

[0015] In one embodiment, the first adhesive region is provided so as to avoid the corner of the base plate where the three fold lines forming the fold piece intersect. The corner of the base plate where the three fold lines forming the fold piece intersect is where the plastic film is pressed strongly against the cardboard when forming the fold lines (creases), so if the first adhesive region is provided there, the adhesive strength may be increased. By providing the first adhesive region so as to avoid the intersection of the three fold lines, it is possible to prevent the plastic film from becoming difficult to peel off.

[0016] The first and second adhesive regions may be positioned so as not to be formed on the fold lines, or some of the first and second adhesive regions may be formed on the fold lines. In either case, in this invention, the positions of both the first and second adhesive regions are determined taking into consideration the relationship between the bottom, side, and fold-in piece of the web corner paper container and the position of the fold line (the point where the three fold lines that form the fold-in piece intersect).

[0017] Preferably, a third adhesive region for releasably adhering the cardboard and the plastic film is provided at a minimum distance of 0.5 mm to 5.0 mm from the fold line on each of the side panels sandwiching the corner of the bottom panel where the three fold lines forming the fold-in piece intersect. The flatness of the plastic film bonded to the inner surface of the cardboard can be maintained even after the paper container is formed (lifting is minimized), and in addition, the plastic film can be smoothly peeled off from the cardboard without feeling any resistance when pulled.

[0018] In another embodiment, a fourth adhesive area is provided at a minimum distance of 0.0 mm to 4.0 mm from the edge of the side panel, which releasably bonds the cardboard and the plastic film together.By providing a fourth adhesive area separate from the first adhesive area near the edge where the plastic film is likely to lift off the cardboard, simply forming the first adhesive area can reduce or prevent the plastic film from lifting off at the edge.

[0019] In one embodiment, when the length of the edge of the side panel is f and the length of the fourth adhesive region along the edge of the side panel is g, the distance between the fourth adhesive regions is 10 mm or more (fg × (number of fourth adhesive regions lined up on one side)) mm or less. Even if the length f of the edge of the side panel is long and the length g of the fourth adhesive region is short, by providing multiple fourth adhesive regions at a predetermined interval, it is possible to reduce or prevent the plastic film from floating at the edge.

[0020] In one embodiment, a tab is connected to the end of at least one side panel via a fold line, and there are no first or second adhesive regions on the tab. That is, the tab makes it easy to peel the plastic film from the cardboard. The peeling of the cardboard and the plastic film at the tab at the end of the web-corner paper container serves as a trigger (starting point) for pulling the plastic film, making it easy to peel the entire plastic film from the cardboard.

[0021] Preferably, the non-adhesive regions excluding the first and second adhesive regions are colored, so that the non-adhesive regions can be clearly indicated, and the first and second adhesive regions can also be clearly indicated in comparison.

[0022] The present invention also provides a blank for a web corner type paper container for forming the above-mentioned web corner type paper container. [Brief explanation of the drawings]

[0023] [Figure 1] FIG. 1 is a development view of a web corner type paper container. [Figure 2] FIG. 2 is a perspective view of an assembled web corner paper container. [Figure 3] 3 is a partially enlarged development view of the web corner type paper container in the range along the line III-III shown in FIG. 1. FIG. [Figure 4] FIG. 10 is a development view of a web corner type paper container according to another embodiment. [Figure 5] FIG. 10 is a development view of a web corner type paper container according to yet another embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0024] 1 and 2 show a web corner type paper container 10 according to the present invention. The web corner type paper container 10 is made of a laminate in which a plastic film 2 is bonded to the inner surface of cardboard 1. Cardboard 1 includes paperboard (cardboard), milk carton paper, drawing paper, Kent paper, corrugated cardboard, etc. The basis weight of the cardboard 1 used can be appropriately designed according to the contents to be stored and the thickness of the plastic film 2 to be laminated, and is, for example, 150 to 600 g / m 2The plastic film 2 can be made of biaxially oriented polypropylene (OPP) film, polyethylene terephthalate (PET) film, or biomass plastic made from renewable organic resources such as plants, and / or polylactic acid (PLA) film, which is a biodegradable plastic that is eventually decomposed into carbon dioxide and water by the action of microorganisms.

[0025] FIG. 1 is an exploded view of cardboard 1 with a plastic film 2 attached to its inner surface (hereinafter, the laminate of cardboard 1 with plastic film 2 attached will be referred to as the "blank") for forming a web-corner paper container 10, showing the side that will become the inner surface of the paper container 10. The dashed-dotted lines indicate the fold lines that will be valley folds when making the web-corner paper container 10, and the dashed-double-dotted lines indicate the fold lines that will be mountain folds. Folding or scoring is performed along these dashed-dotted and double-dotted lines. FIG. 2 is a perspective view of a web-corner paper container 10 made by folding a blank that has been cut out (die-cut) as shown in FIG. 1 and gluing the required locations.

[0026] Referring to Figure 1, the blank for the web corner paper container 10 has a rectangular bottom panel 11. A front panel 12 and a rear panel 13 extend in opposite directions from the boundary (the fold line indicated by the dashed line) at the front and rear short sides of the bottom panel 11. Similarly, a left panel 14 and a right panel 15 extend in opposite directions from the boundary at the left and right long sides of the bottom panel 11. The widths of the front panel 12, rear panel 13, left panel 14, and right panel 15 all increase as they move away from the bottom panel 11, so that when assembled (see Figure 2), the container opens wide upward. The lengths of the front and rear panels 12 and 13, which extend from the short sides of the bottom panel 11, are longer than the lengths of the left and right panels 14 and 15, which extend from the long sides of the bottom panel 11.

[0027] Approximately triangular folded pieces 12a are formed continuously via fold lines on both the left and right sides of the front side plate 12. Similarly, approximately triangular folded pieces 13a, 14a, and 15a are formed continuously via fold lines on both the left and right sides of the rear side plate 13, left side plate 14, and right side plate 15. Adjacent folded pieces are connected to each other at fold lines that extend outward from the corners of the bottom plate 11. A total of four web corner portions are formed in the web corner paper container 10 by two adjacent folded pieces.

[0028] A gripping portion (grip) 16 is connected to approximately the center of the leading edge of the front side plate 12 and to approximately the center of the leading edge of the rear side plate 13 via a folding line.

[0029] The web corner paper container 10 is assembled as follows: The front, rear, left, and right side panels 12, 13, 14, and 15 are raised relative to the bottom panel 11, and the folded-in pieces 12a to 15a are pulled outward and folded to form four web corners. Two web corners are then glued to the outer surface of each of the front and rear panels 12 and 13. By bonding the web corners to the outer surface of the front or rear panel 12 or 13, the two folded-in pieces and the front or rear panel 12 or 13 are triple-layered. The web corners that are layered on the front and rear side panels 12 and 13 extend diagonally from the left and right ends of the lower edges of the front and rear side panels 12 and 13 toward each other, changing direction midway to form edges that extend horizontally. This results in a rectangular parallelepiped paper container 10 that is open at the top, as shown in Figure 2. Because the web corners are formed, the web corner type paper container 10 hardly leaks even if the contents contain water or oil. In addition, the plastic film 2 is provided on the inner surface, so water or oil does not soak into the cardboard 1.

[0030] A cover (not shown) may be provided adjacent to the edge of either the left side plate 14 or the right side plate 15. The upward opening can be covered with the cover.

[0031] The plastic film 2 has a shape that covers the entire inner surface of the cardboard 1, but is not adhered to the entire inner surface. In Figure 1, the plastic film 2 is adhered to the cardboard 1 at a plurality of scattered adhesive areas 5, 5A, 5B, and 5C, shown as circles. The area where the circular adhesive areas 5, 5A, 5B, and 5C are not provided is called the "non-adhesive area 6." The area of ​​the non-adhesive area 6 is larger than the total area of ​​the adhesive areas 5, 5A, 5B, and 5C.

[0032] For example, by gravure printing an easily peelable varnish with the pattern of the non-adhesive region 6 on the inner surface of cardboard 1 (the surface to which plastic film 2 is attached), the easily peelable varnish is pattern-printed in the non-adhesive region 6. An OPP film as the plastic film 2 is attached to the inner surface of cardboard 1 on which the easily peelable varnish pattern has been printed, with molten polypropylene (PP) resin sandwiched between them. Alternatively, a bio-PET film as the plastic film 2 is attached to the inner surface of cardboard 1 on which the easily peelable varnish pattern has been printed, with molten ethylene-methacrylic acid copolymer (EMAA) resin with biomass low-density polyethylene (LDPE) added sandwiched between them. A laminate is created in which there is almost no adhesion in the non-adhesive region 6, while in the adhesive regions 5, 5A, 5B, and 5C, the plastic film 2 and cardboard 1 are partially bonded together due to higher adhesive strength than in the non-adhesive region 6. The blank shown in Figure 1 is completed by cutting the sheet at a fixed pitch and then die-cutting and scoring each of the cut sheets.

[0033] The adhesive strength in the non-adhesive area 6 can be weakened to an immeasurable level by the easily peelable varnish that is printed in a pattern on the inner surface of the cardboard 1. The adhesive strength in the adhesive areas 5, 5A, 5B, and 5C, which are not printed with the easily peelable varnish, basically depends on the material of the plastic film 2. However, the adhesive strength in the adhesive areas can also be adjusted by changing the area of ​​the adhesive areas 5, 5A, 5B, and 5C.

[0034] It is preferable that the peelable varnish (or the solvent for dissolving the peelable varnish) be colored, so that the fact that the peelable varnish has been printed can be seen with the naked eye. In addition, since a color contrast is created between the non-adhesive area 6 and the adhesive areas 5, 5A, 5B, and 5C, a pattern (e.g., polka dots) can be drawn on the inside of the container 10, making it possible to create a visually appealing container 10.

[0035] The adhesive regions can be broadly divided into four types: adhesive regions 5, 5A, 5B, and 5C.

[0036] The adhesive areas 5 are adhesive areas that are evenly provided on the entire inner surface of the cardboard 1 (excluding the folded pieces), and the fixing of the plastic film 2 to the cardboard 1 basically depends on these adhesive areas 5. The adhesive areas 5 are arranged at intervals of a predetermined length L, specifically L = 12 to 40 mm, between the nearest other adhesive areas 5, and the area of ​​each of these is 5 to 30 mm. 2 The numerous adhesive regions 5 may all be of the same shape, for example, circular, or may be of other polygonal shapes, or may be a mixture of various shapes such as circular, triangular, and rectangular. Depending on the size of the web corner paper container 10, multiple adhesive regions 5 are generally provided on each of the bottom plate 11 and side plates 12-15.

[0037] Adhesive areas 5A are provided on each of the side panels sandwiching intersection G, which corresponds to a corner of the bottom panel 11 and where multiple fold lines (creases) forming the fold pieces that make up the web corner portion intersect. Unlike adhesive areas 5, which are basically provided at equal intervals, adhesive areas 5A are provided near each of the intersection points G. Referring to Figure 1 and focusing on fold pieces 13a, 15a that make up one of the web corner portions, adhesive areas 5A are provided on each of the rear side panel 13 and right side panel 15 sandwiching intersection G, which corresponds to a corner of the bottom panel 11 and where creases L1, L2, and L3 forming fold pieces 13a, 15a intersect.

[0038] Near intersection G, where multiple (three) fold lines forming the fold piece intersect, the plastic film 2 is likely to lift when the side panel and fold piece are folded. By providing adhesive areas 5A near this intersection G, unintentional peeling of the plastic film 2 at the web corners is prevented. The adhesive areas 5A are provided with the same adhesive strength (area) as the above-mentioned adhesive areas 5. In order to form the adhesive areas 5A at a location relatively close to intersection G, the distance M (see Figure 3) from each adhesive area 5A to the fold line closest to that adhesive area 5A is set to be 0.5 mm or more and 5.0 mm or less. Furthermore, if adhesive area A is provided on intersection G, the corners of the bottom plate 11 are also the locations where fold lines are concentrated, and the pressure when forming the fold lines causes the plastic film to be pressed strongly against the cardboard, increasing the adhesive strength and making it difficult to peel the plastic film off the cardboard (feeling like it is catching on something). However, by providing adhesive area A near intersection G but avoiding intersection G, the flatness of the plastic film 2 bonded to the inner surface of the cardboard 1 can be largely maintained even after the paper container is formed, and the plastic film 2 can be peeled off from the cardboard 1 without feeling like it is catching on something.

[0039] The adhesive region 5B is provided on at least one of the folded pieces that make up the web corner portion. Referring to Figure 1 and focusing on the folded pieces 13a, 15a that make up one of the web corner portions, the adhesive region 5B is provided on one of the folded pieces 15a. The plastic film 2 can be firmly fixed to the folded piece 15a, which makes it less likely that the plastic film 2 will lift up and become wrinkled when the folded pieces 13a, 15a are folded, thereby preventing poor molding of the web corner portion.

[0040] The adhesive region 5B has a smaller area than the adhesive regions 5 and 5A described above. As a result, at the web corners (folded pieces), the plastic film 2 is adhered to the cardboard 1 with a weaker adhesive force than that at the adhesive regions 5 and 5A. This is because, at the web corners, the folded pieces are folded in, sandwiching the plastic film 2 between multiple pieces of paper. Therefore, a force is also required to pull out the plastic film 2 when peeling it from the web corners. By reducing the area of ​​the adhesive region 5B at the web corners, i.e., by adhering the plastic film 2 with a weak force, the force required to peel off the plastic film 2 at the web corners can be prevented from being greater than necessary, and the force required to peel off the plastic film 2 at the web corners and the force required to peel off the plastic film 2 at other locations can be made as uniform as possible. For example, the adhesive region 5B is provided over an area of ​​1 to 5% of the total area of ​​the fold-out piece 15a.

[0041] Although the force is light, by providing the adhesive area 5B, the plastic film 2 is adhered to the cardboard 1 at the web corner portion, and as described above, the plastic film 2 is less likely to float at the web corner portion, especially during molding, thereby preventing poor molding at the web corner portion.

[0042] The adhesive areas 5C are used when the dimensions of the web-corner paper container 10 are relatively large or when the bottom plate 11 is rectangular, and are provided in an area where it is difficult to prevent the plastic film 2 from lifting up simply by relying on the above-mentioned equally spaced adhesive areas 5. Referring to Figure 1, the adhesive areas 5C are provided at a distance N of 0.0 mm to 4.0 mm from the edge of each of the left and right panels 14, 15, thereby reducing or preventing the plastic film 2 from lifting up at the edge of the web-corner paper container 10. The distance P to adjacent adhesive areas 5C is, for example, 10 mm to (fg × (number of adhesive areas 5C lined up on the long sides)) mm, where f is the length of the edge (long sides) of the left and right panels 14, 15 and g is the diameter (length) of the adhesive area 5C.

[0043] The above-mentioned adhesive regions 5, 5A, 5B, and 5C are preferably provided so as to avoid the fold lines of the web corner paper container 10. This is because a large pressure is applied to the fold lines by the creasing process, and this pressure can cause the adhesive strength of the plastic film 2 to fluctuate (basically become larger). By providing all adhesive regions 5, 5A, 5B, and 5C so as to avoid the fold lines, it is possible to prevent unintended adhesive strength from occurring.

[0044] However, with regard to the intersection G where the multiple (three) fold lines that form the above-mentioned fold piece intersect, it is important not to create an adhesive area at the intersection G, since the plastic film 2 is pressed strongly against the cardboard 1 multiple times when forming the fold lines.However, with regard to the fold lines other than the intersection G, pressure is generally applied only once when forming the fold lines, so there is not as much variation in adhesive strength due to the formation of the fold lines as there is at the intersection G, so it is also possible to form an adhesive area on the fold lines other than the intersection G.

[0045] The above-mentioned gripping portion 16 does not have an adhesive region because the gripping portion 16 makes it easier to peel the plastic film 2 from the cardboard 1 and can easily trigger the peeling of the plastic film 2. Of course, it goes without saying that the gripping portion 16 can be used to grip with the fingers when lifting the web corner paper container 10 with both hands, for example.

[0046] FIG. 4 shows an exploded view of a web corner type paper container 20 having a regular hexagonal bottom plate 21, and FIG. 5 shows an exploded view of a web corner type paper container 30 having a regular octagonal bottom plate 31.

[0047] Referring to Figure 4, the web corner paper container 20 has a regular hexagonal bottom plate 21 and side plates 22 to 27 connected to each of the six sides of the bottom plate 21 via fold lines. Roughly triangular fold pieces 22a to 27a are formed on both the left and right sides of the side plates 22 to 27 via fold lines, and adjacent fold pieces are connected to each other at fold lines that extend outward from the corners of the bottom plate 21. A total of six web corner portions are formed in the web corner paper container 20 by two adjacent fold pieces. Like the web corner paper container 10, the web corner paper container 20 is also made from cardboard 1 and a plastic film 2 bonded to the inner surface of the cardboard 1.

[0048] Referring to Figure 5, the web corner paper container 30 has a regular octagonal bottom plate 31 and side plates 32 to 39 connected to each of the eight sides of the bottom plate 31 via fold lines. Roughly triangular fold pieces 32a to 39a are formed on both the left and right sides of the side plates 32 to 39 via fold lines, and adjacent fold pieces are connected to each other at fold lines that extend outward from the corners of the bottom plate 31. A total of eight web corner portions are formed in the web corner paper container 30 by two adjacent fold pieces. Like the web corner paper container 10, the web corner paper container 30 is also made from cardboard 1 and a plastic film 2 bonded to the inner surface of the cardboard 1.

[0049] In the web-corner paper containers 20, 30 shown in Figures 4 and 5, similar to the web-corner paper container 10 described above, the plastic film 2 is not adhered to the entire inner surface of the cardboard 1, but is adhered at a plurality of scattered adhesive areas 5, 5A, 5B shown as circles. The adhesive areas 5, 5A, 5B are provided so as to avoid the fold lines, thereby preventing unintended adhesive forces from occurring. Note that the web-corner paper containers 20, 30 do not have side panels with long sides at the edges, and therefore do not have adhesive area 5C. [Explanation of symbols]

[0050] 1 cardboard 2. Plastic film 5,5A,5B,5C Adhesive area 6 Non-adhesive area 10, 20, 30 Web Corner Paper Container 11,21,31 Bottom plate 12,13,14,15,22,23,24,25,26,27,32,33,34,35,36,37,38,39 Side panels 12a,13a,14a,15a,22a,23a,24a,25a,26a,27a,32a,33a,34a,35a,36a,37a,38a,39a folding piece 16 Knob

Claims

1. A web corner paper container made from a laminate consisting of cardboard and a plastic film that covers the entire inner surface of the cardboard and is partially peelably bonded to the cardboard, and having a polygonal bottom plate, side plates that are connected to each side of the bottom plate via fold lines and stand up from the bottom plate, and folded pieces that are connected to both sides of the side plate via fold lines and connected via fold lines that extend outward from the corners of the bottom plate, and having web corner parts that are made by pulling two adjacent folded pieces outward and folding them and bonding them to the outer surfaces of the side plates, a first adhesive region and a second adhesive region that releasably adhere the cardboard and the plastic film together; The first adhesive regions (5) are provided in a plurality of locations on each of the bottom plate and the side plates, and are scattered over the entire cardboard with an interval of 12 mm to 40 mm between adjacent first adhesive regions, the second adhesive region (5B) is provided on at least one of two adjacent folded pieces forming the web corner portion; Web corner paper container.

2. The area of ​​the second adhesive region (5B) is 1 to 5% of the area of ​​the fold-out piece on which the second adhesive region is provided. The web corner type paper container according to claim 1.

3. The first adhesive region (5) is provided to avoid the corners of the bottom plate where the three folding lines forming the fold-out piece intersect. The web corner type paper container according to claim 1.

4. A third adhesive region (5A) for releasably adhering the cardboard and the plastic film is provided on each of the side panels sandwiching the corner of the bottom panel where the three fold lines forming the fold-out piece intersect, at a minimum distance of 0.5 mm to 5.0 mm from the fold line. The web corner type paper container according to claim 1.

5. A fourth adhesive region (5C) for peelably adhering the cardboard and the plastic film is provided at a minimum distance of 0.0 mm to 4.0 mm from the edge of the side plate. The web corner type paper container according to claim 1.

6. When the length of the edge of the side plate is f and the length of the fourth adhesive region (5C) along the edge of the side plate is g, the interval between the fourth adhesive regions (5C) is 10 mm or more and (f - g × (the number of fourth adhesive regions lined up on one side)) mm or less. The web corner type paper container according to claim 5.

7. A gripping portion is connected to the end of at least one side plate via a folding line, There are no first or second adhesive regions on the tab portion. The web corner type paper container according to claim 1.

8. the non-adhesive region excluding the first and second adhesive regions is colored; The web corner type paper container according to claim 1.

9. A blank for forming a web corner paper container made from a laminate composed of cardboard and a plastic film that covers the entire inner surface of the cardboard and is partially peelably bonded to the cardboard, and which is equipped with a polygonal bottom plate, side plates that are connected to each side of the bottom plate via fold lines and stand up from the bottom plate, and fold-out pieces that are connected to both sides of the side plate via fold lines and connected via fold lines that extend outward from the corners of the bottom plate, and in which a web corner portion is formed by pulling out two adjacent fold-out pieces and folding them and bonding them to the outer surfaces of the side plates. a first adhesive region and a second adhesive region that releasably adhere the cardboard and the plastic film together; The first adhesive regions (5) are provided in a plurality of locations on each of the bottom plate and the side plates, and are scattered over the entire cardboard with an interval of 12 mm to 40 mm between adjacent first adhesive regions, the second adhesive region (5B) is provided on at least one of two adjacent folded pieces forming the web corner portion; Web corner paper container blanks.

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