Ziplock paper container

Abstract

To provide a zippered paper container 90 in a three-dimensional shape, with a self-standing property and a zipper tape 61 at a top part, for which the zipper tape 61 is torn off when taking out a content and an opening dimension X of a take-out opening part 56 can be increased, so that the content can be easily taken out.MEANS FOR SOLVING THE PROBLEM: Stiffness SCSb of a front side zipper tape connection body 65 obtained by connecting a front side zipper tape 61b to a front side blank plate 10b of the zippered paper container 90 is smaller than stiffness SCSa of a back side zipper tape connection body 65a obtained by connecting a back side zipper tape 61a to a back side blank plate 10a.SELECTED DRAWING: Figure 10

Description

[Technical field]

[0001] The present disclosure relates to a paper container with a zipper, and in particular to a paper container with a zipper in the field of paper containers that have a three-dimensional shape and are self-supporting, and which has a large opening for removal, making it easy to remove the contents. [Background technology]

[0002] Conventionally, a technology for a paper container with a zipper has been disclosed, such as that in Patent Document 1. That is, a zipper is provided on the top of a rectangular parallelepiped paper container, and the zipper can be opened when the contents are to be removed, and closed when the contents have been removed.

[0003] The above technology can protect the contents and prevent the contents from spilling when the paper container falls over. Also, because it is a paper container, it is easy to reduce the volume of the container and dispose of it after the contents are consumed. Figure 1 shows a blank plate 81 used to manufacture a paper container 80 with a zipper of the prior art, Figure 2 shows a perspective view of the paper container 80 with a zipper of the prior art, and Figure 3 shows a perspective view of the paper container with a zipper with the top open.

[0004] In addition, unless otherwise specified, referring to Fig. 2, the front wall panel 831b is regarded as the front, and the front, back, left, right, top, and bottom of the chuckable paper container 80 are indicated. The same applies to the chuckable paper container 90 of the present disclosure.

[0005] In addition, the reference numbers used when describing the prior art are in the 80s or 800s to distinguish them from the present disclosure. The subscript a of the symbol indicates an element on the back side of the resealable paper container 80, and the subscript b indicates an element on the front side. For elements with both the subscripts a and b, the symbol without a subscript includes both a and b.

[0006] In the case of the zippered paper container 80 described in Patent Document 1, when the top is opened and the contents are removed, first the protruding portion (ear) 874 on the top surface is removed from the body portion 872 (see Figure 2), then the easy-open processing line 851 is cut, and then the zipper tape 861 is opened to open the removal opening 856 (see Figure 3). The contents are then removed from the removal opening 856 using a tool such as a spoon, tongs, etc. Alternatively, the contents are removed by hand without using a tool.

[0007] However, when removing the contents, it is desirable that the removal opening 856 is large, but the prior art paper container 80 with a zipper had no measures for enlarging the removal opening 856. As a result, the removal opening 856 could not be made to have a stable large opening dimension. [Prior art documents] [Patent documents]

[0008] [Patent Document 1] JP 2005-178833 A Summary of the Invention [Problem to be solved by the invention]

[0009] The present disclosure has been made to solve the above problems, and its object is to provide a paper container 90 with a zipper in which the opening dimension X of the removal opening 56 for removing the contents is stably large. [Means for solving the problem]

[0010] The above problems can be solved by the following embodiments of the present disclosure. That is, the retractable paper container 90 of the present disclosure has the following features: In a paper container 90 with a zipper, which is assembled by joining a front blank plate 10b and a back blank plate 10a, each of which is made of a laminated sheet 78 based on paper, A top portion 71 is provided at the top of the zipper-equipped paper container 90, and includes an upper overlapping plate 34 formed by overlapping and joining the front blank plate 10b and the back blank plate 10a, and a top plate 33 connected to the lower side of the upper overlapping plate 34; A top side plate 41 is connected to the left and right ends of the upper overlapping plate 34, A top-side protrusion 74 is provided on both the left and right sides of the top portion 71, A body portion 72 provided below the top portion 71; A bottom portion 73 provided on the lower side of the body portion 72; an upper seal portion 53 that crosses the upper edge portion 21 or the vicinity of the upper edge portion 21 of the upper overlapping plate 34 and the side plate 41 of the top portion; a zipper tape 61 located below the upper seal portion 53 and extending across the upper overlapping plate 34 and the side plate 41 of the top portion; The zipper tape 61 is composed of a male zipper tape 61m and a female zipper tape 61f. Either the male zipper tape 61m or the female zipper tape 61f is joined to the front blank sheet 10a, and the other is joined to the back blank sheet 10a, The reverse bending stiffness SCSb of the front zipper tape joint portion 65b where the front zipper tape 61b is joined to the front blank plate 10b is greater than the reverse bending stiffness SCSa of the back zipper tape joint portion 65a where the back zipper tape 61a is joined to the back blank plate 10a.

[0011] In addition, in the paper container 90 with a zipper according to an embodiment of the present disclosure, The laminated sheet 78 constituting the front blank plate 10b and the back blank plate 10a is the same, The reverse bending stiffness SCTb of the front zipper tape 61b may be greater than the reverse bending stiffness SCTa of the back zipper tape 61a.

[0012] In addition, in the paper container 90 with a zipper according to an embodiment of the present disclosure, The front zipper tape 61b may be a female zipper tape 61f, and the back zipper tape 61a may be a male zipper tape 61m.

[0013] In addition, in the paper container 90 with a zipper according to an embodiment of the present disclosure, An easy-to-open processing line 51 may be provided between the upper seal portion 53 and the zipper tape 61.

[0014] In addition, in the paper container 90 with a zipper according to an embodiment of the present disclosure, An easily peelable portion 58 may be provided in an area including the upper seal portion 53 of the front blank sheet 10b and the back blank sheet 10a. Effect of the Invention

[0015] According to the embodiment of the present disclosure described above, the opening of the removal opening 56 for removing the contents can be stably large, thereby providing a paper container 90 with a zipper that allows the contents to be easily removed from the removal opening 56 using a tool such as a spoon or tongs, or by hand without using a tool. [Brief description of the drawings]

[0016] [Figure 1] FIG. 1 is a development view of a blank plate 81 used in manufacturing a paper container 80 with a zipper according to the prior art. [Diagram 2] FIG. 1 is a perspective view of a resealable paper container 80 of the prior art. [Diagram 3] 1 is a perspective view of a conventional paper container 80 with a zipper with a top portion 871 open. [Figure 4]1 is a development view of a blank plate 93 used in manufacturing a retractable paper container 90 according to the first embodiment of the present disclosure. FIG. [Diagram 5] FIG. 5 is a front view showing the shape of a paper container (in a flat state) 91 at an intermediate stage when a paper container 90 with a zipper is produced using the blank plate 93 shown in FIG. [Figure 6] 5 is a perspective view showing the shape of a paper container (in a standing state) 92 at an intermediate stage when a paper container 90 with a zipper is produced using the blank plate 93 shown in FIG. 4. FIG. [Figure 7] 5 is a perspective view of a paper container 90 with a zipper produced using the blank plate 93 shown in FIG. 4. FIG. [Figure 8] FIG. 8 is a side view of the zippered paper container 90 shown in FIG. [Figure 9] FIG. 8 is a plan view of the zippered paper container 90 shown in FIG. [Figure 10] 8 is a perspective view of the zippered paper container 90 shown in FIG. 7 with the top part 71 open. [Figure 11] 10(a) is a diagram showing the upper edge portion of FIG. 3;(b) is a diagram showing the upper edge portion of FIG. [Figure 12] 1A is a cross-sectional view (disengaged state) of the zipper tapes 61 and 861 of the present disclosure (prior art); FIG. 1B is a cross-sectional view (engaged state) of the zipper tapes 61 and 861 of the present disclosure (prior art). [Figure 13] FIG. 2 is a cross-sectional view of laminated sheets 78, 88 of blank plates 93, 81 of the present disclosure (prior art). [Figure 14] 1A and 1B are cross-sectional views of a prior art zip tape assembly 865 in an engaged state and an uncoupled state, respectively. [Figure 15] 1A is a cross-sectional view of a zipper tape assembly 65 of the present invention (in an engaged state), and FIG. 1B is a cross-sectional view of a zipper tape assembly 65 of the present invention (in a disengaged state). [Figure 16] 11(a) is an enlarged view of part B in FIG. 11(a), and (b) is an enlarged view of part C in FIG. [Figure 17]FIG. 11 is a front view showing the shape of a paper container (in a flat state) 91 at an intermediate stage when producing a paper container 90 with a zipper according to a second embodiment of the present disclosure. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0017] The present disclosure will be described below with reference to the drawings, however, the present disclosure is not limited to the specifically illustrated embodiments or various specifically described structures. In each drawing, the size and ratio of the components may be changed or exaggerated for ease of understanding, and parts that are unnecessary for the explanation or repeated reference numerals may be omitted for ease of viewing.

[0018] In addition, the numerical values ​​such as dimensions of each member and the names of materials described in this specification are examples of embodiments, and are not limited to these, and may be appropriately selected and used. In this specification, terms that specify shapes or geometric conditions, such as parallel, orthogonal, vertical, center, etc., are intended to include substantially the same state in addition to their strict meanings.

[0019] The blank plate 93 of the chuckable paper container 90 of the present disclosure is formed into a rectangular outer shape using a laminated sheet 78 having at least a base paper layer and at least an innermost layer of a thermoplastic resin such as polyethylene, and various fold lines are provided within the blank plate 93 to separate the forming plates for each part required to form the chuckable paper container 90.

[0020] <First embodiment> <Blank board> The blank plate 93 of the chuck-equipped paper container 90 of this embodiment is shown in Fig. 4. Fig. 4(a) shows the back blank plate 10a, and Fig. 4(b) shows the front blank plate 10b. The back blank plate 10a and the front blank plate 10b are collectively referred to as the blank plate 93.

[0021] Unless otherwise specified, in each component of the blank plate 93 described below, the subscript a of each symbol indicates an element of the back blank plate 10a, and the subscript b indicates an element of the front blank plate 10b. For elements with both the subscripts a and b, the symbol without a subscript includes both a and b.

[0022] The rear upper edge 21a, which is the lower side of the rear blank plate 10a in the drawing of FIG. 4(a), becomes the upper side of the paper container 90 with a zipper. The front-side upper edge portion 21b, which is the upper side of the front-side blank plate 10b in the drawing of FIG. 4(b), becomes the upper side of the paper container 90 with a zipper.

[0023] In both Figures 4(a) and (b), the front side of the drawing corresponds to the outer side when the resealable paper container 90 is assembled, and the back side corresponds to the inner side. Figures 4(a) and (b) are symmetrical with respect to the upper edge portions 21a and 21b, respectively, and when the inner surfaces of the back blank plate 10a and the front blank plate 10b are aligned and overlapped, each component (the forming plates, lines, sealing portions, zipper tape joints, etc. described below) overlap.

[0024] The back blank plate 10a and the front blank plate 10b are aligned and stacked and joined to produce an intermediate stage paper container with a zipper (flat state) 91 as shown in Figure 5, and then an intermediate stage paper container with a zipper (raised state) 92 as shown in Figure 6 is produced, progressing through the steps to complete the paper container with a zipper 90; this manufacturing process will be described later.

[0025] Unless otherwise specified, the top, bottom, left and right of the front blank plate 10b will be shown with reference to Figure 4(b). The back blank plate 10a will also be described with its upper edge 21a as the top side. Therefore, the top and bottom are reversed in Figure 4(a). In the paper container 90 with a zipper, the upper edge 21 side is the upper side, and the lower edge 26 side is the lower side.

[0026] As will be described later, the formed resealable paper container 90 is composed of a top portion 71, a body portion 72, and a bottom portion 73, in that order from the top, and the top portion may be referred to as the top portion and the bottom portion may be referred to as the bottom portion (see FIG. 7). In addition, when describing the up-down direction of each component provided on the top 71, the term "top side" may refer to the upper edge 21 side, and when describing the up-down direction of each component provided on the bottom 73, the term "bottom side" may refer to the lower edge 26 side.

[0027] As described above, the rear blank plate 10a and the front blank plate 10b have vertically symmetrical shapes, so the blank plate 93 will be described with reference to the front blank plate 10b. As long as the function is not changed, the rear blank plate 10a and the front blank plate 10b may not be symmetrical. Moreover, the rear blank plate 10a and the front blank plate 10b are made of the same material (layer structure) and are manufactured by the same method.

[0028] The front blank plate 10b of the zippered paper container 90 of this embodiment has an outer shape that is roughly rectangular, with the upper side being the front upper edge portion 21b, the left and right sides being the front side edge portions 11b, and the lower side being the front lower edge portion 26b. The front blank plate 10b has a shape that is symmetrical with respect to a vertical line passing through the center of the front blank plate 10b in the width direction. The laminated sheet 78 constituting the blank plate 93 will be described later.

[0029] The front blank plate 10b is provided with, in the longitudinal direction from the left, a front first vertical folding line 12b, a front second vertical folding line 13b, a front second vertical folding line 13b, and a front first vertical folding line 12b. That is, the vertical folding line closer to the side edge 11b of each front blank plate 10b is the front first vertical folding line 12b, and the vertical folding line farther from the side edge 11b of each front blank plate 10b is the front second vertical folding line 13b. It is preferable that each of these front longitudinal fold lines 12b, 13b is substantially parallel to the side edge 11b of the front blank plate 10b.

[0030] In addition, the front blank plate 10b is provided with, in the transverse direction from the front upper edge portion 21b, a front first horizontal folding line 22b, a front second horizontal folding line 23b, a front third horizontal folding line 24b, and a front fourth horizontal folding line 25b. It is preferable that the front side horizontal fold lines 22b, 23b, 24b, 25b are each approximately parallel to the upper edge 21b and the lower edge 26b.

[0031] Furthermore, a pair of diagonal fold lines 17b on the top side of the front surface and a pair of diagonal fold lines 18b on the bottom side of the front surface are provided on the left and right sides, and the forming plates of each part required for forming the zippered paper container 90 are partitioned and configured.

[0032] The upper end of the front top diagonal folding line 17b is at the same position as the front first top intersection point Eb, which is the intersection point of the front first vertical folding line 12b and the front first horizontal folding line 22b. The lower end of the front top diagonal folding line 17b is at the same position as the front second top intersection point Fb, which is the intersection point of the front second vertical folding line 13b and the front second horizontal folding line 23b.

[0033] The upper end of the front bottom diagonal fold line 18b is at the same position as the front second bottom intersection point Hb, which is the intersection point of the front second vertical fold line 13b and the front third horizontal fold line 24b. The lower end of the front bottom diagonal fold line 18b is at the same position as the front first bottom intersection point Gb, which is the intersection point of the front first vertical fold line 12b and the front fourth horizontal fold line 25b.

[0034] The oblique folding lines 17b on the front side may be located near the intersections Eb and Fb without contacting them. Furthermore, the oblique folding lines 18b on the front side may be located near the intersections Gb and Hb without contacting them. By positioning each of the above-mentioned front side diagonal folding lines and each intersection point in close proximity without touching each other, it is possible to maintain sufficient folding performance while preventing excessive concentration of folding lines at any particular location, thereby preventing a decrease in the strength of the laminated sheet 78 of the front side blank plate 10b.

[0035] At both left and right side edge portions 11b of the front blank plate 10b, front side edge seal portions 36b are formed via the front first vertical folding lines 12b.

[0036] Further, at the front bottom edge portion 26b located below the front blank plate 10b, a front bottom seal margin 37b is formed at the front fourth horizontal folding line 25b.

[0037] Further, the front blank plate 10b is provided with forming plates for each part downward from the front upper edge 21b located at the uppermost position.

[0038] Regarding the main part, a front upper overlapping plate 34b is provided below the front upper edge 21b. A front top panel 33b is connected to the bottom of the front upper overlapping plate 34b via a front first horizontal bending line 22b. A front wall panel 31b is connected to the bottom of the front top panel 33b via a front second horizontal bending line 23b. A front bottom panel 35b is connected to the bottom of the front wall panel 31b via a front third horizontal bending line 24b.

[0039] Further, side plates 41b of the top part of the front side are connected to the outside of both the left and right sides of the front side upper overlapping plate 34b via the front side second vertical folding line 13b.

[0040] Further, on both the left and right outer sides of the front top panel 33b, front top protruding portions (ear portions) 38b are connected via the front second vertical folding lines 13b.

[0041] Further, a front side panel 32b is connected to the outside of both the left and right sides of the front wall panel 31b via a front second vertical bending line 13b.

[0042] Further, on both the left and right outer sides of the front bottom panel 35b, front bottom protruding portions (ear portions) 43b are connected via the front second vertical bending lines 13b.

[0043] Also, the top protruding portion (ear) margin 38b is connected to the bottom of each top side panel 41b via the first horizontal bending line 22b. The top protruding portion (ear) margin 38b is connected to the bottom of the top protruding portion (ear) margin 38b via the second horizontal bending line 23b. The bottom protruding portion (ear) margin 43b is connected to the bottom of the side panel 32b via the third horizontal bending line 24b.

[0044] A front bottom seal portion 37b is connected to the lower side of the front bottom plate 35b and the front bottom protruding portion (ear portion) portions 43b on both the left and right sides.

[0045] A front side edge seal portion 36b is connected to the outer sides of the side panel 41b of the front top portion, the front top protruding portion (ear) portion 38b, the front side panel 32b, and the front bottom protruding portion (ear) portion 43b via the front first vertical fold line 12b.

[0046] In the present embodiment, the process of providing folding lines to the blank plate 93 (creasing process) is performed after the laminated sheet 78 is completed, and then the laminated sheet 78 is fed to a machine that manufactures the chuck paper container 90. Alternatively, the creasing process may be performed by the machine that manufactures the chuck paper container 90.

[0047] As the method for forming the creasing lines, an appropriate method is adopted from among known methods such as a platen method and a rotary die method. Also, the laminated sheet 78 may be cut into sheets before the scoring process is performed, or the laminated sheet 78 may be supplied to the scoring process in a roll form.

[0048] Next, a punching process for manufacturing blank plates 93 by punching the laminated sheet 78 will be described. For the punching process, an appropriate method is selected from known methods such as a platen method and a rotary die method. The blank plate 93 may be formed directly from the rolled laminated sheet 78, or the sheet may be cut into sheets and then punched. The order of the creasing and punching processes does not matter. They may be done at the same time.

[0049] In addition, the roll-shaped laminated sheet 78 slit to a specified roll width may be fed to a machine that manufactures paper containers 90 with zippers, and the roll-shaped laminated sheet 78 may be cut in the cross direction to produce blank plates 93.

[0050] The rear blank plate 10a has the same shape as the front blank plate 10b and is symmetrical with respect to the axis of the front blank plate 10b. In other words, the blank plates have the same shape but have the layer structure reversed.

[0051] Fig. 5 is a front view showing the shape of a chucked paper container (flat state) 91 at an intermediate stage when manufacturing a chucked paper container 90 using the blank plate 93 shown in Fig. 4. The topmost part is the upper edge 21b of the front blank plate 10b shown in Fig. 4(b), and on its back side is the back blank plate 10a. The back blank plate 10a cannot be seen with the naked eye, but when viewed through, it has almost the same shape as the front blank plate 10b.

[0052] In addition, in Figure 5, the back blank plate 10a and the front blank plate 10b are overlapped, and each component has the same positional relationship when viewed through the drawing, within the range of manufacturing variations, so the notation and suffixes for the front side may be omitted in the explanation.

[0053] On the upper overlapping plate 34 and the side plate 41 of the top surface, at a predetermined position where the two blank plates mentioned above overlap each other, an upper seal portion 53 as a transverse sealing means and a zipper tape joint portion 52 are provided in sequence from the upper edge portion 21.

[0054] The upper seal portion 53 is provided at or near the upper edge 21 of the upper overlapping plate 34 and each of the top side plates 41 . When the upper seal portion 53 is approximately parallel to the upper edge portion 21, the length of the upper seal portion 53 can be shortened, and no waste is generated in the blank plate 93.

[0055] The upper seal portion 53 as a transverse sealing means is formed by joining the opposing front-side upper seal portion 53b and back-side upper seal portion 53a. The joining is performed so as to traverse the entire width of the upper edge portion 21 of the resealable paper container 90 or the vicinity of the upper edge portion 21, so that the resealable paper container 90 is kept airtight.

[0056] Additionally, it is desirable that the upper seal portion 53 be approximately parallel to the upper edge portion 21. Additionally, it is desirable that the zipper tape joint portion 52 be approximately parallel to the upper edge portion 21. In such a configuration, it is easy to open and close the zipper tape 61 and to remove the contents. Also, the length of the zipper tape 61 can be shortened.

[0057] <Easy-to-open processing line> The easy-open processing line 51 will now be described. The front upper overlapping plate 34b and the side plate 41b of the top part of the front side may be provided with a front easy-open processing line 51b as an opening means. By providing the easy-open processing line 51b, the zippered paper container 90 can be opened without using tools such as scissors.

[0058] Referring to FIG. 5, the easy-open processing line 51 extends from one side edge 11 to the other side edge 11 of the blank plate 93 and exists between the upper seal portion 53 and the zipper tape 61 .

[0059] A notch 77 may be provided at either end of the easy-open processing line 51, and in this embodiment, the notch 77 is provided at the right side edge 11. The notch 77 may also be provided at the left side edge 11. Alternatively, notches 77 may be provided at both the left and right side edges 11. Providing the notch 77 makes initial opening easier.

[0060] By cutting the easy-open processing line 51 from one side edge (here the right side) 11 to the other side edge (here the left side) 11, the upper overlapping plate 34 and the side plate 41 of the top of the front side are cut transversely, and the upper seal portion 53 is also cut away, exposing the zipper tape 61.

[0061] When an intermittent half-cut line or a straight half-cut line is used for the easy-open processing line 51 of the opening means, it may be formed by a method using a normal blade, but a half-cut line with greater precision and stability can be formed by using a method using laser light irradiation, a method using ultrasonic waves, or a method called diamond cutting.

[0062] Moreover, the easy-open processing line 51 may be in the shape of a band having a width. Moreover, a plurality of easy-open processing lines 51 may be provided.

[0063] The easy-open processing line 51b may not be provided depending on the material, layer structure, and easy-open processing conditions of the laminated sheet 78 of the front blank plate 10b. Even without the easy-open processing line 51b, it may be possible to open the package by hand.

[0064] Furthermore, when the easy-opening process line 51b is not provided as described above, the container may be opened with a blade such as scissors. In that case, the intended opening line may be indicated by printing. The printing position may be the position of the easy-opening process line 51b shown in Fig. 4. The intended opening line may not be clearly indicated on the chuck-equipped paper container 90, but may be indicated in an attached instruction manual or the like.

[0065] <Zipper tape> Fig. 12 is a schematic cross-sectional view showing an example of the configuration of a zipper tape 61 used in a paper container with zipper tape 90 of the present disclosure. The zipper tape 61 shown in Fig. 12(a) is a state in which a male zipper tape 61m and a female zipper tape 61f are formed by extrusion molding, respectively, before being combined. The zipper tape 61 is composed of a male zipper tape body 62m provided with a convex male zipper tape fitting portion 63m, and a female zipper tape body 62f provided with a concave female zipper tape fitting portion 63f.

[0066] The zipper tape 61 is formed by extrusion molding of a thermoplastic resin, or may be formed as a multi-layer extrusion molding by using a resin suited to the required performance of each component of the zipper tape 61 (such as the zipper tape body 62, the zipper tape fitting portion 63, etc.).

[0067] The material of the side of the zipper tape body 62 which is joined to the blank plate 93 desirably has a low melting point since it is heat-welded, but the side of the zipper tape body 62 which is not joined to the blank plate 93 or the portion not in contact with the outer surface (the inner layer) may have heat resistance sufficient to withstand the heat sealing temperature.

[0068] Examples of the former low melting point material include low density polyethylene (LDPE) and linear low density polyethylene (LLDPE), while examples of the latter heat resistant material include medium density polyethylene (MDPE), high density polyethylene (HDPE), and polypropylene (PP).

[0069] In addition, since the female zipper tape fitting portion 63f needs to deform when fitting with the male zipper tape fitting portion 63m, it may be made of a softer material, such as low density polyethylene (LDPE), linear low density polyethylene (LLDPE), medium density polyethylene (MDPE), etc.

[0070] Furthermore, since male zipper tape fitting portion 63m does not need to deform when fitting with female zipper tape fitting portion 63f, male zipper tape fitting portion 63m may be harder than female zipper tape fitting portion 63f (hardness depending on material and shape). Examples of the material of the male zipper tape fitting portion 63m include low density polyethylene (LDPE), linear low density polyethylene (LLDPE), medium density polyethylene (MDPE), high density polyethylene (HDPE), and polypropylene (PP).

[0071] The male zipper tape 61m and the female zipper tape 61f, which are separately extrusion-molded, are fitted together at their respective male zipper tape fitting portions 63m and female zipper tape fitting portions 63f, as shown in Figure 12(b), to complete the zipper tape 61.

[0072] <Zipper tape joining procedure> The procedure for assembling the zippered paper container 90 will be described later, but here, the procedure for joining the zipper tape 61 to the blank plate 93 will be described.

[0073] In this case, the zipper tape joint portion 52 is a portion to be joined by the zipper tape 61 when assembling the zippered paper container 90.

[0074] The rear blank sheet 10a and the front blank sheet 10b are overlapped, and the side edge seal portions 36 and the upper seal portions 53 are heat sealed together. At this time, the zipper tape 61, in which the male zipper tape 61m and the female zipper tape 61f have been previously fitted at their male zipper tape fitting portions 63m and female zipper tape fitting portions 63f, is inserted into this portion, and at the same time, the zipper tape joint portions 52 of the two blank sheets 93 are heat-sealed by applying heat and pressure to the outer surfaces of the two blank sheets 93. Then, the blank sheets 93 and the zipper tapes 61 are heat-sealed.

[0075] The method of joining the zipper tape 61 to the blank plate 93 is not limited to the above-mentioned heat sealing, and other methods such as adhesive or adhesive tape may be used.

[0076] Although an example has been shown here in which the male zipper tape 61m is the back zipper tape 61a and the female zipper tape 61f is the front zipper tape 61b, the male zipper tape 61m may be the front zipper tape 61b and the female zipper tape 61f may be the back zipper tape 61a.

[0077] By heat-sealing the zipper tape 61 in this manner, there is less misalignment in the heat seal compared to a method in which the male zipper tape 61m and the female zipper tape 61f are separately heat-sealed to the zipper tape joint 52, and the attachment process is simplified, so that the zipper tape 61 can be attached with high production efficiency.

[0078] <Laminated sheet of blank boards> As described above, the laminated sheet 78 used for the blank plate 93 is a laminated sheet 78 having at least a paper base layer 782 laminated thereto, and at least the innermost thermoplastic resin layer 783 made of a thermoplastic resin such as polyethylene. However, if necessary, the intermediate layers may be provided with a barrier layer 785 against water vapor, oxygen, or other substances, or a strength-enhancing layer.

[0079] Furthermore, when providing a printed layer with a pattern or the like on the zippered paper container 90 of this embodiment, it is usually printed on the surface of the paper base layer 782. However, if the paper base layer 782 is not well suited for printing, a printed layer with a pattern or the like can be provided on, for example, a biaxially oriented polyethylene terephthalate film, and the film can be laminated to any of the outer layers of the paper base layer 782.

[0080] The paper base layer 782 is preferably made of paper that is rigid and does not easily crack when folded along a folding line, but there are no particular limitations and an appropriate paper can be selected and used depending on the contents to be filled into the zippered paper container 90, taking into consideration water resistance (size degree) and other factors. As specific examples, wood-free paper, bleached kraft paper, cup base paper, milk carton base paper, etc. can be suitably used, and the basis weight thereof is 80 to 320 g / m 2 The range is appropriate.

[0081] Examples of resins that can be used for the innermost layer and, if necessary, the outermost and intermediate thermoplastic resin layers (sealant layers) include low-density polyethylene (LDPE), linear low-density polyethylene (LLDPE), medium-density polyethylene (MDPE), high-density polyethylene (HDPE), ethylene-α-olefin copolymers polymerized using a single-site catalyst, ethylene-vinyl acetate copolymers (EVA), ethylene-acrylic acid copolymers (EAA), ethylene-methacrylic acid random copolymers (EMAA), ethylene-methyl acrylate copolymers (EMA), ethylene-ethyl acrylate copolymers (EEA), ionomers, polypropylene and its copolymers, and polyester-based resins. From these, an appropriate resin can be selected and used depending on the contents to be filled and the conditions of storage and use.

[0082] Of the above thermoplastic resins, ethylene-methyl acrylate copolymer (EMA) and ethylene-methacrylic acid random copolymer (EMAA) are particularly excellent in thermal stability during processing such as extrusion coating, adhesion to various substrates, and low-temperature heat sealability, as well as in thin-film formability. Therefore, it is easy to extrusion coat and laminate the outermost thermoplastic resin layer, which does not require a large thickness, at a relatively thin thickness of, for example, 6 to 10 μm, making it possible to reduce the proportion of plastic materials used and also achieving cost benefits.

[0083] The thermoplastic resin layers of the innermost layer and, if necessary, the outermost layer, as described above, can be laminated by extrusion coating the resin on the laminated surface after subjecting the laminated surface to an easy-adhesion treatment such as anchor coating, corona treatment, or flame (flame) treatment as necessary, or by forming the thermoplastic resin into a film in advance and laminating the film by using a known dry laminate or extrusion laminate (sandwich laminate) or the like.

[0084] When the barrier layer 785 is laminated on the intermediate layer of the laminated sheet 78, a metal foil such as an aluminum foil, or a deposition film in which a metal or inorganic oxide such as aluminum, silica, or alumina is deposited to a thickness of 20 to 100 nm on a base film such as a biaxially oriented polyethylene terephthalate film (hereinafter, PET film), a biaxially oriented nylon film (hereinafter, ON film), or a biaxially oriented polypropylene film (hereinafter, OPP film) can be used as the barrier layer 785. Alternatively, a saponified ethylene-vinyl acetate copolymer film (hereinafter, EVOH film), a biaxially oriented nylon MXD6 film, a polyacrylonitrile film, or a PET film, ON film, or OPP film provided with a coating layer of polyvinylidene chloride can be used.

[0085] Such a barrier layer 785 is usually preferably laminated on the inner surface of the intermediate paper base layer 782 in order to effectively utilize its gas barrier properties, but when a metal foil such as aluminum or a metal-deposited film is used for the barrier layer 785, the metallic feel can also be utilized in the design, so that it can also be laminated on the outer surface of the paper base layer 782. The barrier layer 785 can be easily laminated by known dry lamination or extrusion lamination (sandwich lamination), etc.

[0086] The layer structure of the laminated sheet 78 of the blank plate 93 of the resealable paper container 90 of this embodiment is illustrated. FIG. 13(a) is a cross-sectional view of a laminated sheet 78 of a blank plate 93 consisting of three layers. The layer structure is as follows: Outermost thermoplastic resin layer 781 / Paper base layer 782 / Innermost thermoplastic resin layer 783 It consists of:

[0087] FIG. 13(b) is a cross-sectional view of a laminated sheet 78 of a blank plate 93 consisting of two layers. The layer structure is as follows: Paper base layer 782 / innermost thermoplastic resin layer 783 This layer structure is obtained by removing the outermost thermoplastic resin layer 781 from the three-layered blank plate 93 shown in Fig. 13(a).

[0088] In addition, when the blank plate 93 is required to have a barrier property (water vapor, oxygen, aroma retention, etc.), a barrier layer 785 can be provided. Fig. 13(c) is a cross-sectional view of a laminated sheet 78 of the blank plate 93 consisting of five layers, and the layer structure is as follows: Outermost thermoplastic resin layer 781 / Paper base layer 782 / Intermediate adhesive layer 784 / Barrier layer 785 / innermost thermoplastic resin layer 783 It consists of:

[0089] FIG. 13(d) is a cross-sectional view of a laminated sheet 78 of a blank plate 93 consisting of four layers. The layer structure is as follows: Paper base layer 782 / Intermediate adhesive layer 784 / Barrier layer 785 / Innermost thermoplastic resin layer 783 It consists of: This layer structure is obtained by removing the outermost thermoplastic resin layer 781 from the five-layer blank plate 93 shown in FIG. 13(c).

[0090] The layers of the laminated sheets 78 are bonded together by known methods such as dry lamination, extrusion coating, adhesives, etc. Note that layers for bonding the layers together are not shown because they are thin.

[0091] The laminated sheet 88 of the retractable paper container 80 of the prior art is similar to the laminated sheet 78 of the retractable paper container 90 of the present disclosure. Referring to FIG. 13, there are an outermost thermoplastic resin layer 881 , a paper base layer 882 , an innermost thermoplastic resin layer 883 , an intermediate adhesive layer 884 , and a barrier layer 885 .

[0092] <Preparation of paper container with zipper> Below is an overview of the steps taken to create an intermediate stage paper container with a zipper (flat state) 91 from a blank plate 93 of a paper container with a zipper 90, to create an intermediate stage paper container with a zipper (raised state) 92, and finally to complete a package of paper container with a zipper 90 filled with the contents.

[0093] <Creating a paper container with a zipper (flat state) at the intermediate stage> When the two blank plates 10a, 10b are overlapped, the zipper tape 61, which has a male zipper tape 61m and a female zipper tape 61f already fitted together, is inserted into the position where the zipper tape joints 52 overlap, and the zipper tape joints 52 are heated and pressurized from the outer surface of the blank plate 93 to be heat-sealed.

[0094] Next, the inner faces of the upper seal portion 53 are heat-sealed, and the inner faces of the seal margins 36 of the side edges adjacent to the side edge portion 11 of the blank plate 93 are heat-sealed, so that the lower edge portion 26 is formed into an open bag shape.

[0095] Also, a notch 77 may be provided at each end (at the points contacting the side edges on both sides) of the outer edge of the easy-open processing line 51. The notch 77 may be provided at either one of the ends.

[0096] The actual production of the zippered paper container 90 is not particularly limited, but in order to improve productivity, a machine may be used that performs in-line assembly of the paper container, filling of the contents, and sealing of each joint.

[0097] In this device, a long printed laminated sheet 78 wound up in a roll can be unwound, and in a format in which the paper containers are connected horizontally, processing of folding lines, insertion and heat sealing of zipper tape 61, heat sealing of side edge seal portions 36, heat sealing of upper seal portion 53, punching of notches 77, etc. can be performed.

[0098] It should be noted that the order of the steps may be different from that described above, so long as the desired paper container 90 with a zipper can be obtained.

[0099] Next, an intermediate-stage paper container with a zipper (flat state) 91 in the shape shown in Figure 5 is produced by cutting it into individual paper containers, and then it is molded into a three-dimensional shape to produce an intermediate-stage paper container with a zipper (raised box state) 92 as shown in Figure 6.

[0100] <Creating a paper container with a zipper (in an erected state) at the intermediate stage> A mandrel is inserted through the opening of the bottom 73 of this intermediate stage zippered paper container (flat state) 91, leaving the upper overlapping plate 34, and the lower top plate 33 is spread out front to back by the first horizontal fold line 22, and the upper overlapping plate 34 is stood upright.

[0101] Here, in order to ensure that the ridge portion 72d of the body portion 72 is bent, an auxiliary member may be brought into contact with the vicinity (including abutment) of the ridge portion 72d from the inner side and / or the outer side of the body portion 72.

[0102] A top portion 71 made of a top panel 33 is formed below the upper overlapping plate 34, followed by a body portion 72 having an approximately rectangular shape in horizontal cross section, and an intermediate stage paper container with a zipper (standing state) 92 is formed with a bottom portion 73 opening in an approximately rectangular shape. At this stage, as shown in FIG. 6, the upper overlapping plate 34 stands upward.

[0103] In addition, in the design, the shape of the horizontal cross section of the body 72 and the shape of the opening of the bottom 73 are assumed to be rectangular, but because the zippered paper container 90 is made of a flexible laminated sheet mainly made of paper, they are made approximately rectangular, even if they are not completely rectangular.

[0104] <Forming and filling of paper containers with zippers> Next, the upper overlapping plate 34, which stands upward, is folded toward the back side (the back top panel 33a side) and laid down, and the top side protruding portions (ears) 74, which protrude on both the left and right sides, are folded toward the side panel 32 and joined to the body portion 72.

[0105] The joining method may be a method using an adhesive (hot melt, etc.), a method using an adhesive tape, a mechanical joining method (engagement, joining with a joining tool), etc. Also, when a thermoplastic resin layer (sealant layer) is provided on the outermost layer of the blank plate 93, the thermoplastic resin layer may be heat-sealed. A similar method is used for joining the bottom side protrusions (ears) 75 described later.

[0106] In addition, the tip of the top protrusion (ear) 74 may be joined to the body 72 of the paper container 90 with a zipper. In addition, a portion other than the tip of the top side protruding portion (ear) 74 may be joined to the body 72 of the zippered paper container 90. In that case, the tip of the top side protruding portion (ear) 74 does not need to be joined to the body 72 of the zippered paper container 90.

[0107] The bottom 73 of the intermediate stage zippered paper container (standing state) 92 formed as described above is turned upward, and the contents are filled through the open bottom 73, and then the bottom 73 is folded and the bottom side seal portions 37 are heat sealed together in a palm-to-palm seal format.

[0108] Then, the bottom side seal portion 37 is folded toward the back side (toward the back side bottom panel 35a) and laid down, and the bottom side protruding portions (ears) 75 protruding on both the left and right sides are folded toward the bottom panel 35 and joined, thereby completing the packaging of the approximately rectangular shaped zippered paper container 90.

[0109] Fig. 7 is a perspective view showing a first embodiment of a chuck paper container 90 of the present disclosure. Fig. 8 is a side view of the chuck paper container 90 shown in Fig. 7. Fig. 9 is a plan view of the chuck paper container 90 shown in Fig. 7.

[0110] The zippered paper container 90 shown in FIG. 7 has an outer shape formed into a substantially rectangular parallelepiped shape, and its body 72 has a ridge portion 72d. In addition, the design assumes a rectangular shaped paper container 90 with a zipper, but since the paper container 90 with a zipper is made of a flexible laminated sheet 78 mainly made of paper, it is made to have an approximately rectangular shape, even if it does not have a perfect rectangular shape.

[0111] <Opening operation for removing the contents of a paper container with a zipper> FIG. 10 shows the completed package of the resealable paper container 90 containing the contents with the top portion 71 opened to allow the contents to be removed.

[0112] The easy-open processing line 51 is opened by hand from a notch 77 provided on one side edge 11 (here the right side) and is cut all the way to the other side edge 11 (here the left side).

[0113] Next, the front side opening grip area 57b between the front side easy-open processing line 51b and the front side zipper tape 61b, and the back side opening grip area 57a between the back side easy-open processing line 51a and the back side zipper tape 61a are each grasped with a human hand and spread out toward the outside of the zippered paper container 90, thereby opening the zipper tape 61 exposed at the easy-open processing line 51.

[0114] During this opening operation of the zipper tape 61, the ends of the zipper tape 61 on the side edge 11 side of each blank plate 93 are opened over substantially the entire width up to the seal margins 36 on each side edge. As described above, the male zipper tape 61m and the female zipper tape 61f of the zipper tape 61 are separated from each other, whereby the removal opening 56 is formed.

[0115] <Zipper tape properties and installation position> Fig. 11(a) shows the edge of the upper side of the removal opening 856 of the opened chuck paper container 80 of the prior art when viewed from above. Fig. 11(b) shows the edge of the upper side of the removal opening 56 of the chuck paper container 90 of the present disclosure when viewed from above.

[0116] A cross-sectional view of a zipper tape 861 of the prior art is shown in Fig. 12. Fig. 12(a) shows a state in which the male zipper tape 861m and the female zipper tape 861f are separated from each other, while Fig. 12(b) shows a state in which the male zipper tape 861m and the female zipper tape 861f are engaged with each other.

[0117] Moreover, the zipper tape 61 of the present disclosure has a similar shape to that described above, and will also be described with reference to Fig. 12. Regarding the reference numerals, the reference numerals for the zipper tape 861 of the prior art and the zipper tape 61 of the present disclosure are shown together. A cross-sectional view of the zipper tape 61 of the present disclosure is shown in Fig. 12. Fig. 12(a) shows a state in which the male zipper tape 61m and the female zipper tape 61f are separated from each other, and Fig. 12(b) shows a state in which the male zipper tape 61m and the female zipper tape 61f are engaged with each other.

[0118] Fig. 14(a) shows a cross-sectional view of a zipper tape joint 865 in which a zipper tape 861 and a blank sheet 81 of the prior art are joined, cut at the cross-sectional position AA in Fig. 5. Note that Fig. 5 is a diagram showing a paper container (flat state) at an intermediate stage of the present disclosure, but is also used for the zipper tape joint 865 of the prior art to explain the cross-sectional position.

[0119] At this stage, the male zipper tape 861m and the female zipper tape 861f are in a mated state. FIG. 14(b) is a cross-sectional view showing a state in which the engagement between the male zipper tape 861m and the female zipper tape 861f is released from the state shown in FIG. 14(a).

[0120] In FIG. 14(a), a front zipper tape 861b is joined to a front blank plate 81b, and the front zipper tape 861b serves as a male zipper tape 861m. Further, a back zipper tape 861a is joined to the back blank plate 81a, and the back zipper tape 861a serves as a female zipper tape 861f.

[0121] The zipper tape joint portion 865 will be described. The zipper tape joint portion 865 includes a front zipper tape joint portion 865b on the front side of the zippered paper container 90 and a back zipper tape joint portion 865a on the back side.

[0122] 14(a), the front zipper tape joint portion 865b indicates an area where the front blank plate 81b is joined with a width equal to that of the front zipper tape body portion 862b. In other words, the front zipper tape joint portion 865b has a configuration in which the front blank plate 81b is joined to the front zipper tape body portion 862b, and is an element with the same width as the front zipper tape 861b.

[0123] As will be described later, when measuring the stiffness of the front zipper tape joint portion 865b, the front zipper tape joint portion 865b is cut into a tape shape. The back zipper tape joint portion 865a is defined similarly to the front zipper tape joint portion 865b.

[0124] Figure 15 shows a zipper tape joint portion 65 of this embodiment. In Figure 15(a), a front zipper tape 61b is joined to a front blank plate 10b, and the front zipper tape 61b serves as a female zipper tape 61f. Further, a back zipper tape 61a is joined to the back blank plate 10a, and the back zipper tape 61a is a male zipper tape 61m.

[0125] However, unlike this embodiment, there may be a case where the front zipper tape 61b is the male zipper tape 61m and the back zipper tape 61a is the female zipper tape 61f. In either case, the zipper tape 61 is a pair of a male zipper tape 61m and a female zipper tape 61f.

[0126] The zipper tape joint portion 65 will be described. The zipper tape joint portion 65 includes a front zipper tape joint portion 65b on the front side of the zippered paper container 90 and a back zipper tape joint portion 65a on the back side.

[0127] 15(a), the front zipper tape joint portion 65b indicates an area where the front blank plate 10b is joined with a width equal to that of the front zipper tape body portion 62b. In other words, the front zipper tape joint portion 65b has a configuration in which the front blank plate 10b is joined to the front zipper tape body portion 62b, and is an element with the same width as the front zipper tape 61b.

[0128] As will be described later, when measuring the stiffness of the front zipper tape joint portion 65b, the front zipper tape joint portion 65b is cut into a tape shape. The back zipper tape joint portion 65a is defined similarly to the front zipper tape joint portion 65b.

[0129] In this embodiment, the reverse bending stiffness SCSb of the front zipper tape joint portion 65b is greater than the reverse bending stiffness SCSa of the back zipper tape joint portion 65a. This allows the opening 56 for removal to be enlarged, making it easier to remove the contents.

[0130] In this example, the reverse bending stiffness SCSm of the male zipper tape joint portion 65m is smaller than the reverse bending stiffness SCSf of the female zipper tape joint portion 65f. However, in reality, the reverse bending stiffness SCS of the joined zipper tape joint portion 65 is more important than the shapes and arrangement of the male zipper tape 61m and the female zipper tape 61f.

[0131] Here, the reason why the opening 56 for removal is made larger will be explained. Figure 16(a) is a horizontal cross-sectional view at the position of the fitting portion 863 of the zipper tape 861 near the first vertical fold line 812 when a zippered paper container 80 of the conventional technology is opened (see part B in Figure 11(a)).

[0132] At that location, the front blank plate 81b and the front zipper tape 861b (the front zipper tape joint portion 865b described above) joined to the front blank plate 81b are not bent significantly but are substantially straight.

[0133] On the other hand, the rear blank plate 81a and the rear zipper tape 861a (the rear zipper tape joint portion 865a described above) joined to the rear blank plate 81a are significantly bent and bent at the relevant portion, so that bending stress is applied to the rear zipper tape joint portion 865a.

[0134] Figure 16(b) is a horizontal cross-sectional view at the position of the fitting portion 63 of the zipper tape 61 near the first vertical fold line 12 when the zippered paper container 90 of this embodiment is opened (see part C in Figure 11(b)).

[0135] At this location, the front blank plate 10b and the front zipper tape 61b (the front zipper tape joint portion 65b described above) joined to the front blank plate 10b are not bent significantly but are substantially straight.

[0136] On the other hand, the back blank sheet 10a and the back zipper tape 61a (the back zipper tape joint portion 65a described above) joined to the back blank sheet 10a are greatly bent and bent at the relevant portion, so that bending stress is applied to the back zipper tape joint portion 65a.

[0137] Here, the back zipper tape joint portion 65a to which bending stress is applied will be considered. In the case where the reverse bending stiffness SCSm of the male zipper tape joint portion 65m and the reverse bending stiffness SCSf of the female zipper tape joint portion 65f are different due to various conditions such as the shape and material, it is desirable to use the zipper tape joint portion 65 having the lower reverse bending stiffness SCS of the male zipper tape joint portion 65m or the female zipper tape joint portion 65f for the back zipper tape joint portion 65a where bending stress is applied.

[0138] In the present embodiment, the rear blank plate 10a is bent more at the rear first vertical folding line 12a than in the conventional technology where the reverse bending stiffness SCSa of the rear zipper tape joint portion 865a is greater than the reverse bending stiffness SCSb of the front zipper tape joint portion 865b. Therefore, the removal opening 56 of the chuck paper container 90 of the present embodiment is larger than the removal opening 856 of the chuck paper container 80 of the conventional technology.

[0139] In the above description, the female zipper tape 61f is arranged on the front zipper tape 61b, and the male zipper tape 61m is arranged on the back zipper tape 61a. In this embodiment, the reverse bending stiffness SCSb of the front zipper tape joint portion 65b and the reverse bending stiffness SCSa of the back zipper tape joint portion 65a are used as indicators, regardless of the shapes and arrangements of the male zipper tape 61m and the female zipper tape 61f.

[0140] In this embodiment, the reverse bending stiffness SCSb of the front zipper tape joint portion 65b and the reverse bending stiffness SCSa of the back zipper tape joint portion 65a are used as indexes. Here, in the front blank sheet 10b and the back blank sheet 10a, when the laminated sheets 78 are the same, the magnitude relationship between the reverse bending stiffness SCTm of the male zipper tape 61m and the reverse bending stiffness SCTf of the female zipper tape 61f directly becomes the magnitude relationship between the reverse bending stiffness SCSm of the male zipper tape joint portion 65m and the reverse bending stiffness SCSf of the female zipper tape joint portion 65f.

[0141] Therefore, when the zipper tape member having the lower rigidity out of the male zipper tape 61m and the female zipper tape 61f is arranged as the back zipper tape 61a, the reverse bending rigidity SCSa of the back zipper tape joint portion 65a becomes smaller than the reverse bending rigidity SCSb of the front zipper tape joint portion 65b.

[0142] Moreover, in the zipper tape 61 of this embodiment, an example is shown in which the reverse bending stiffness SCTm of the male zipper tape 61m is smaller than the reverse bending stiffness SCTf of the female zipper tape 61f. This is because the male zipper tape fitting portion 63m has one protrusion protruding from the male zipper tape body portion 62m, while the female zipper tape fitting portion 63f has two protrusions protruding from the female zipper tape body portion 62f to form a recess, which makes it difficult to bend, and often increases the reverse bending stiffness SCT of the zipper tape 61.

[0143] The above relationship applies when the male zipper tape 61m and the female zipper tape 61f have the same material and layer structure. In the case of the above relationship, the male zipper tape 61m having a low reverse bending stiffness SCT of the zipper tape 61 may be disposed on the back zipper tape 61a.

[0144] Furthermore, an easy-open processing line 51 may be present between the upper seal portion 53 and the zipper tape 61. When initially opening the zippered paper container 90 of this embodiment, the easy-open processing line 51, which has been processed in advance to make it easier to open, is cut, and the upper seal portion 53 that has sealed the upper edge portion 21 is removed, exposing the zipper tape 61.

[0145] Next, the front side opening grip area 57b between the front side easy-open processing line 51b and the front side zipper tape 61b, and the back side opening grip area 57a between the back side easy-open processing line 51a and the back side zipper tape 61a are each grasped with a human hand and spread out toward the outside of the zippered paper container 90, thereby opening the zipper tape 61 exposed at the easy-open processing line 51.

[0146] During this opening operation of the zipper tape 61, the ends of the side edges 11 of the zipper tape 61 are opened up to the seal margins 36 on the respective side edges.

[0147] Second Embodiment FIG. 17 shows a paper container with a zipper in an intermediate stage (flat state) of this embodiment. An easily peelable portion 58 is provided on the inner side of the blank plate 93 including the upper seal portion 53. The easily peelable portion 58 is provided over substantially the entire area of ​​the upper seal portion 53, and serves to obtain a sealing state of appropriate strength (weakness) when the upper seal portion 53 is joined.

[0148] The appropriate sealing state refers to a strength that prevents leakage of the contents of the resealable paper container 90 and contributes to maintaining its shape. It also refers to a strength (weakness) that allows the upper seal portion 53 to be peeled off by hand.

[0149] When initially opening the chuck paper container 90 of this embodiment, first, the front side opening gripping area 57b between the front side upper edge 21b and the front side upper seal part 53b, and the back side opening gripping area 57a between the back side upper edge 21a and the back side upper seal part 53a are each gripped by hand and spread outwardly of the chuck paper container 90. This causes the sealed state of the upper seal part 53, which has been processed to be easily peeled in advance, to be peeled off, the upper edge part 21 is released, and the chuck tape 61 is exposed.

[0150] Furthermore, the front side opening gripping area 57b between the front side upper edge 21b and the front side zipper tape 61b, and the back side opening gripping area 57a between the back side upper edge 21a and the back side zipper tape 61a are each grasped with a human hand and spread outwardly of the zippered paper container 90, thereby opening the exposed zipper tape 61.

[0151] During this opening operation of the zipper tape 61, the ends of the side edges 11 of the zipper tape 61 are opened up to the seal margins 36 on the respective side edges.

[0152] The easily peelable processed portion 58 for obtaining the upper seal portion 53 having the appropriate seal strength as described above can be formed by applying a coating liquid of an easy-peel thermoplastic resin or a resin called an anti-heat seal agent in a pattern by means of gravure printing or flexographic printing, drying the applied liquid, and then heat-sealing the applied portion.

[0153] The peelable weak seal portion preferably has a sealability and can be peeled off with a moderate force, and the heat seal strength is preferably in the range of 1 to 20 N / 15 mm width.

[0154] Furthermore, when the easily peelable processed portion 58 is formed of an easy-peel thermoplastic resin, the easy-peel thermoplastic resin may be, for example, a resin composition in which a polyolefin resin such as low-density polyethylene or ethylene-vinyl acetate copolymer is appropriately mixed with polystyrene, chlorinated polypropylene, polybutene-1, inorganic or organic fillers, polyethylene wax, fatty acid amides, or the like as additives.

[0155] As the inorganic or organic filler, powders of silica, calcium carbonate, talc, kaolin, clay, titanium oxide, alumina, aluminum hydroxide, etc. can be used as the inorganic filler, and powders of silica are particularly preferred, while powders of melamine resin, urea resin, alkyd resin, epoxy resin, acrylic resin, polystyrene, ethylene fluoride resin, silicone resin, etc. can be used as the organic filler.

[0156] The content of the above additives in the above resin composition is preferably in the range of 4 to 40 mass %. If the content of the additives is less than 4 mass %, the heat seal strength will be too strong and good weak seal parts (easy peel properties) will not be obtained. On the other hand, if the content of the additives exceeds 40 mass %, the heat seal strength will be too weak, which is not preferable.

[0157] The coating amount of the above-mentioned easy-peel thermoplastic resin is 2 to 8 g / m2 when dried. 2 is preferable, and 3 to 5 g / m 2 is more preferred.

[0158] When the easily peelable portion 58 is formed from a heat-sealing agent, a resin composition in which a base resin is mixed with an appropriate amount of a release agent can be used as the heat-sealing agent. For example, ethyl cellulose, cyclized rubber, acrylic resin, etc. can be used as the base resin, and for example, silicone resin, polyethylene wax, soybean lecithin, higher fatty acid amide, etc. can be used as the release agent. When applying an anti-heat seal agent, the amount of application may be small, and a thickness in the range of 0.3 to 2 μm is appropriate.

[0159] In addition, since the easily peelable portion 58 weakens the bonding strength between the inner faces of the blank plates 93, it is preferable not to provide it in a location where a strong bond is desired. In this embodiment, it is preferable that the easily peelable portion 58 does not extend to the region of the seal portion 36 on the side edge portion. In consideration of variations in manufacturing, it is preferable that the seal portion 36 on the side edge portion and the easily peelable portion 58 are spaced apart. The distance between them may be 0.5 mm or more and 15 mm or less.

[0160] If the distance is less than 0.5 mm, there is a risk that the side edge seal portion 36 and the easily peelable portion 58 will overlap due to manufacturing variations. If the gap exceeds 15 mm, the opening when the top portion 71 of the resealable paper container 90 is fully opened will be small, making it difficult to remove the small amount of remaining contents.

[0161] The paper container 90 with a zipper of this embodiment has an easy peeling section 58 instead of the easy opening processing line 51, which is the opening means at the top of the paper container 90 with a zipper of the first embodiment. Other materials, processing methods, etc. are the same as those of the first embodiment.

[0162] As described above, the size of the opening for removal 56 of the retractable paper container 90 of the present disclosure is larger than the opening for removal 856 of the retractable paper container 80 of the prior art. Therefore, the contents can be easily removed using a tool such as a spoon or tongs, or can be easily removed by hand without using a tool.

[0163] In addition, the method of creating the blank plate 93 has been mainly explained in relation to the front blank plate 10b, but as the shape of the back blank plate 10a is the same, it is symmetrical about the upper edge portions 21a, 21b, and the manufacturing method is the same, the explanation of the back blank plate 10a will be omitted.

[0164] <Method of measuring stiffness> The method of measuring the stiffness of each member will be described. In this specification, measurements based on the Taber stiffness tester method are used. In the Taber stiffness tester method of JIS-P-8125 (2000), the size of the test piece is specified as 38 mm wide x 70 mm long, but the paper container with a zipper 90 of the present disclosure cannot ensure that size, and a test piece of that size cannot be taken out. Therefore, a test piece of 13 mm wide x 70 mm long will be taken here. Other measurement methods are measured in accordance with JIS-P-8125 (2000).

[0165] The test pieces to be measured are the male zipper tape 61m, the female zipper tape 61f, the male zipper tape joint portion 65m, and the female zipper tape joint portion 65f. When measuring the stiffness, the male zipper tape 61m and the female zipper tape 61f are not symmetrical on the front and back, but each zipper tape body 62 has a zipper tape fitting portion 63 protruding from one surface thereof and the other surface thereof is smooth. Therefore, the measured stiffness value may differ depending on the bending direction, whether the zipper tape fitting portion 63 is on the inside or outside of the radius of curvature.

[0166] Here, bending in a direction that brings the zipper tape fitting portion 63 into the radius of curvature is defined as bending in a positive direction. Conversely, bending in a direction that brings the zipper tape fitting portion 63 into the radius of curvature is defined as bending in a negative direction. Stiffness measurements related to zipper tapes in this specification are performed using the method described above.

[0167] The measuring machine used to measure stiffness in this specification is the following device. Model number: ST-201 Taber type stiffness tester Manufacturer: Tester Industries Co., Ltd.

[0168] In addition, the test piece is taken so that the zipper tape fitting portion 63 is disposed along the length of the test piece, approximately near the center of the width (short side) of the test piece. The method of taking a test piece of the zipper tape joint portion 65 where the blank plate 93 and the zipper tape 61 are joined is the same as that of the zipper tape 61, and the size of the test piece is also the same. The definition of the bending direction when measuring the stiffness is also the same, with the side where the zipper tape fitting portion 63 is provided being the reference. EXAMPLES

[0169] The present disclosure will now be described more specifically with reference to examples. <Example 1> In Example 1, a paper container 90 with a zipper having the configuration shown in FIG. 7 was produced using a blank plate 93 in FIG. 4 corresponding to the first embodiment.

[0170] Two blank sheets 10a, 10b as shown in Fig. 4 were prepared, and the inner surfaces of the blank sheets 10a, 10b were aligned and overlapped, and the side edge seal portions 36 of the opposing sides were heat-sealed as shown in Fig. 5, and the upper seal portion 53 was also heat-sealed. At the same time, the zipper tape 61 was also heat-sealed. In this way, a paper container with a zipper (in a flat state) 91 in the intermediate stage in which the bottom seal portion 37 was not sealed was produced.

[0171] Next, it was raised into a three-dimensional shape as shown in FIG. 6 to produce a paper container with a zipper in an intermediate stage (standing state) 92 with an open bottom 73, and then the paper container with a zipper 90 of Example 1 was produced.

[0172] The laminated sheet 78 of the blank plate 93 had the following structure. (Outer side) Printing layer (gravure printing) / Paper base layer 782 (Nippon Paper Bleached Kraft (S) 120g / m 2 ) / Intermediate adhesive layer 784 (EMAA 20μm Mitsui Dow Polychemical N0908N) / Barrier layer 785 (silica-deposited PET 12μm Dai Nippon Printing IB-PET-UBP) / The innermost thermoplastic resin layer is 783 (LDPE 40μm Japanese polyethylene LC520) (Inner side)

[0173] A method for producing the laminated sheet 78 will now be described. First, a barrier layer 785 (silica-deposited PET 12 μm) was laminated on the inner surface of the paper base layer 782 by extrusion lamination (sandwich lamination) with a molten intermediate adhesive layer 784 (EMAA 20 μm) interposed therebetween.

[0174] Next, on the opposite side (inner side) of the paper base layer 782 of the barrier layer 785, an innermost thermoplastic resin layer 783 (LDPE 40 μm) was formed by extrusion lamination. Next, a design was printed on the outer surface of the paper base layer 782 using a gravure printing machine.

[0175] In order to improve the bonding strength between the bonding layers, anchor coat treatment, corona treatment, flame treatment, etc. may be performed as necessary. Alternatively, ozone treatment may be performed on the molten resin.

[0176] Next, the laminated sheet 78 was subjected to scoring and punching to complete a blank plate 93 .

[0177] The zipper tape 61 that is heat-sealed to the inner surface of the upper overlapping plate 34 and the top side plate 41 of the zipper-equipped paper container 90 has a two-layer structure in which the zipper tape body 62 that is heat-sealed is made up of both the male zipper tape 61m and the female zipper tape 61f.

[0178] The zipper tape 61 has a resin layer formed of LLDPE on the side to be heat sealed to the zippered paper container 90, and a resin layer formed of MDPE on the opposite side. In addition, the male zipper tape fitting portion 63m and the female zipper tape fitting portion 63f are both formed of LLDPE, and the width of the zipper tape body portions 62 is both 13 mm.

[0179] In this embodiment, the front zipper tape 61b is a female zipper tape 61f and the back zipper tape 61a is a male zipper tape 61m, and the zipper tapes 61m, 61f are joined to the blank plate 93 at predetermined positions.

[0180] Here, the grain of the paper base layer 782 will be described. The grain of the paper base layer 782 is parallel or perpendicular to the longitudinal direction of the zipper tape 61. In this embodiment, the grain of the paper base layer 782 is parallel.

[0181] The rear blank plate 10a and the front blank plate 10b are rectangular, measuring 220 mm in length and 169 mm in width, and have side edge seal margins 36 of 7 mm width provided on both left and right side edges 11 as seal margins at the peripheral edges.

[0182] Additionally, a bottom seal margin 37 having a width of 10 mm was provided on each of the lower edges 26 of the lower side. Further, a seal margin of an upper seal portion 53 having a width of 7 mm was provided near the upper edge portion 21 of the upper overlapping plate 34 and the side plate 41 of the top portion.

[0183] The blank plate 93 is provided with, in the order listed below from the upper edge 21, an upper overlapping plate 34, a first horizontal folding line 22, a top panel 33, a second horizontal folding line 23, a wall panel 31, a third horizontal folding line 24, and a bottom panel 35.

[0184] Additionally, on the outer sides of both the left and right sides of the upper overlapping plate 34, top side plates 41 are provided via the second vertical folding line 13.

[0185] Additionally, on the outer sides of both the left and right sides of the top panel 33, there are provided top side protrusions (ears) 38 via the second vertical folding lines 13.

[0186] In addition, side panels 32 are provided on the outside of both left and right sides of the wall panel 31 via second vertical folding lines 13.

[0187] In addition, bottom side protrusions (ears) 43 are provided on the outside of both left and right sides of the bottom panel 35 via the second vertical folding lines 13.

[0188] In addition, a top protrusion (ear) space 38 is connected to the lower side of the top side panels 41 on both the left and right sides via the first horizontal folding line 22.

[0189] The side panel 32 is connected to the lower side of the top protruding portion (ear portion) space 38 via the second horizontal folding line 23.

[0190] A bottom protrusion (ear) portion 43 is connected to the lower side of the side panel 32 via the third horizontal bending line 24.

[0191] A bottom seal portion 37 is connected to the lower side of the bottom plate 35 and the bottom protrusions (ears) 43 on both the left and right sides.

[0192] Furthermore, on the upper overlapping plate 34 and the top side plate 41, an easy-open processing line 51 (here a perforation line) is printed in the transverse direction on the paper base layer 782 of the laminated sheet 78 as a means for opening the container, at a position 8 mm below the upper edge 21, which becomes the upper edge when the inner surfaces of the two blank plates 10a, 10b are aligned and overlapped, as shown in Figure 5.

[0193] Also, below the easy-open processing line 51, zipper tapes 61 (13 mm wide) were heat-sealed to the inner surfaces of the upper overlapping plate 34 and each of the top side plates 41 with a gap of 3 mm.

[0194] In addition, after joining the two blank sheets 10a, 10b, heat sealing the zipper tape 61, heat sealing the side edge seal portion 36, and heat sealing the upper seal portion 53 in the above-mentioned manner, a notch 77 was provided on the side edge portion 11 on the right side of the easy-open processing line 51, and a zippered paper container (flat state) 91 in the intermediate stage with the bottom 73 in an unsealed state was produced (see FIG. 5).

[0195] Next, a mandrel was inserted into this intermediate stage paper container with a zipper (flat state) 91 from the unsealed opening of the bottom 73, leaving the upper overlapping plate 34, and the top plate 33 below it was spread back and forth along the first horizontal folding line 22, so that the upper overlapping plate 34 stood upright. Below that was the top part 71 made of the top plate 33, and further the body part 72 whose horizontal cross section (plane approximately parallel to the bottom surface) is approximately rectangular, forming an intermediate stage paper container with a zipper (standing state) 92 with a bottom 73 opening in an approximately rectangular shape (see FIG. 6).

[0196] Then, the overlapped upper overlapping plate 34 was folded toward the back top plate 33a. The upper overlapping plate 34 bent toward the rear top panel 33a is a part of the components of the top portion 71.

[0197] Furthermore, the top side protrusions (ears) 74 connected to both the left and right sides of the top 71 of the resealable paper container 90 were joined to the body 72 of the resealable paper container 90. This joining was performed by joining the paper base layer 782 on the lower surface of the top side protrusions (ears) 74 and the paper base layer 782 on the surface of the body 72 using hot melt.

[0198] The completed paper container 90 with a zipper was formed into a substantially rectangular parallelepiped shape with dimensions of 95 mm in width, 120 mm in height, and 60 mm in depth.

[0199] <Example 2> This embodiment was the same as Example 1, except that the grain of the paper base layer 782 was perpendicular. The front zipper tape 61b was the female zipper tape 61f, and the back zipper tape 61a was the male zipper tape 61m.

[0200] <Example 3> This example was the same as Example 1, except that the paper base layer 782 was changed. The grain of the paper base layer 782 was parallel. A laminated sheet 78 having the following configuration was used. (Outer side) Printing layer (gravure printing) / Paper base layer 782 (Nippon Paper Co., Ltd. Liquid paper container base paper 150g / m 2 ) / Intermediate adhesive layer 784 (EMAA 20μm Mitsui Dow Polychemical N0908N) / Barrier layer 785 (silica-deposited PET 12μm Dai Nippon Printing IB-PET-UBP) / The innermost thermoplastic resin layer is 783 (LDPE 40μm Japanese polyethylene LC520) (Inner side)

[0201] The front zipper tape 61b is a female zipper tape 61f, and the back zipper tape 61a is a male zipper tape 61m.

[0202] <Example 4> This embodiment was the same as embodiment 3, except that the grain of the paper base layer 782 was perpendicular. The front zipper tape 61b was the female zipper tape 61f, and the back zipper tape 61a was the male zipper tape 61m.

[0203] <Example 5> This example was the same as Example 1, except that the paper base layer 782 was changed. The grain of the paper base layer 782 was parallel. A laminated sheet 78 having the following configuration was used. (Outer side) Printing layer (gravure printing) / Paper base layer 782 (Nippon Paper Bleached Kraft (S) 100g / m 2 ) / Intermediate adhesive layer 784 (EMAA 20μm Mitsui Dow Polychemical N0908N) / Barrier layer 785 (silica-deposited PET 12μm Dai Nippon Printing IB-PET-UBP) / The innermost thermoplastic resin layer is 783 (LDPE 40μm Japanese polyethylene LC520) (Inner side)

[0204] The front zipper tape 61b is a female zipper tape 61f, and the back zipper tape 61a is a male zipper tape 61m.

[0205] <Example 6> This embodiment was the same as Example 5, except that the grain of the paper base layer 782 was perpendicular. The front zipper tape 61b was the female zipper tape 61f, and the back zipper tape 61a was the male zipper tape 61m.

[0206] <Example 7> In this embodiment, the laminated sheet 78 of the blank plate 93 had the following structure. The rest of the laminated sheet 78 was the same as in the first embodiment. The grain of the paper base layer 782 is parallel, the front zipper tape 61b is the female zipper tape 61f, and the back zipper tape 61a is the male zipper tape 61m.

[0207] The laminated sheet 78 of the blank plate 93 in this embodiment had the following configuration. (Outer side) Printing layer (gravure printing) / Outermost thermoplastic resin layer 781 (LDPE 20μm Japan Polyethylene LC520) / Paper base layer 782 (Nippon Paper Co., Ltd. Liquid paper container base paper 150g / m 2 ) / Intermediate adhesive layer 784 (EMAA 20μm Mitsui Dow Polychemical N0908N) / Barrier layer 785 (silica-deposited PET 12μm Dai Nippon Printing IB-PET-UBP) / The innermost thermoplastic resin layer is 783 (LDPE 40μm Japanese polyethylene LC520) (Inner side)

[0208] <Comparative Example 1> This comparative example was the same as Example 1, except that the front zipper tape 61b was a male zipper tape 61m and the back zipper tape 61a was a female zipper tape 61f.

[0209] <Comparative Example 2> This comparative example was the same as Example 2, except that the front zipper tape 61b was a male zipper tape 61m and the back zipper tape 61a was a female zipper tape 61f.

[0210] <Comparative Example 3> This comparative example was the same as Example 3, except that the front zipper tape 61b was a male zipper tape 61m and the back zipper tape 61a was a female zipper tape 61f.

[0211] <Comparative Example 4> This comparative example was the same as Example 4, except that the front zipper tape 61b was a male zipper tape 61m and the back zipper tape 61a was a female zipper tape 61f.

[0212] <Comparative Example 5> This comparative example was the same as Example 5, except that the front zipper tape 61b was a male zipper tape 61m and the back zipper tape 61a was a female zipper tape 61f.

[0213] <Comparative Example 6> This comparative example was the same as Example 6, except that the front zipper tape 61b was a male zipper tape 61m and the back zipper tape 61a was a female zipper tape 61f.

[0214] <Comparative Example 7> This comparative example was the same as Example 7, except that the front zipper tape 61b was a male zipper tape 61m and the back zipper tape 61a was a female zipper tape 61f.

[0215] <Evaluation> 100 pieces of each of the paper containers with zippers of Examples 1 to 7 and Comparative Examples 1 to 7 were produced.

[0216] The zippered paper containers 90 of Examples 1 to 7 prepared as described above were filled with wheat flour as the contents from the bottom 73. Next, the bottom 73 was folded in, the bottom seal tab 37 was heat sealed, and the heat-sealed part was laid down toward the back bottom panel 35a.

[0217] Furthermore, the bottom protrusions (ears) 75 protruding from both the left and right sides of the bottom 73 of the chuck-equipped paper containers 90 of Examples 1 to 6 were folded toward the bottom plate 35. Furthermore, they were joined to the front bottom plate 35b and / or the front bottom seal portion 37b with an adhesive (hot melt) to complete a package of the chuck-equipped paper container 90 having a substantially rectangular parallelepiped shape. In addition, the top protrusions (edges) 74 of the resealable paper containers 90 of Examples 1 to 6 were also bonded to the body 72 with an adhesive (hot melt) before filling with wheat flour.

[0218] Furthermore, the zippered paper containers 80 of Comparative Examples 1 to 7 were filled with wheat flour as the contents from the bottom 873. Next, the bottom 873 was folded in, and the bottom side seal tab 837 was heat-sealed, and the heat-sealed part was laid down toward the rear side bottom panel 835a.

[0219] Furthermore, the bottom protrusions (ears) protruding from both the left and right sides of the bottom 873 of the chucked paper containers 80 of Comparative Examples 1 to 6 were folded toward the bottom plate 835. Furthermore, they were joined to the front side bottom plate 835b and / or the front side bottom seal portion 837b with an adhesive (hot melt) to complete a package of the chucked paper container 80 having a substantially rectangular parallelepiped shape. In addition, the top protrusions (edges) 874 of the resealable paper containers 90 of Comparative Examples 1 to 6 were also bonded to the body 872 with an adhesive (hot melt) before filling with wheat flour.

[0220] In addition, the bottom side protruding parts (ears) 75 protruding from both the left and right sides of the bottom 73 of the zippered paper container 90 of Example 7 were folded toward the bottom plate 35. Furthermore, the bottom side protruding parts (ears) 75 were heat-sealed to the front side bottom plate 35b and / or the front side bottom side seal part 37b, completing the package of the zippered paper container 90 having a substantially rectangular parallelepiped shape. In addition, the top protrusion (edge) 74 of the resealable paper container 90 of Example 7 was also joined to the body 72 by heat sealing before filling with wheat flour.

[0221] In addition, the bottom protruding parts (ears) protruding from both the left and right sides of the bottom 873 of the chuck paper container 80 of Comparative Example 7 were folded toward the bottom plate 835. Furthermore, the bottom protruding parts (ears) were heat-sealed to the front bottom plate 835b and / or the front bottom seal part 837b, completing a package of the chuck paper container 90 having a substantially rectangular parallelepiped shape. In addition, the top protrusion (edge) 874 of the chuck-equipped paper container 80 of Comparative Example 7 was also joined to the body 872 by heat sealing before filling with wheat flour.

[0222] In addition, the packages of the resealable paper containers 90 of Examples 1 to 7 and the resealable paper containers 80 of Comparative Examples 1 to 7 prepared as described above were tested for suitability for removing contents and resealability with the zipper.

[0223] In the packaging of the zippered paper container 90 of Examples 1 to 7, the upper seal portion 53 could be easily cut away to form an opening 56 for removal by the easy-open processing line 51 provided as an opening means on the upper overlapping plate 34 and the upper part of the top side plate 41, and the notch 77 provided at one end of the easy-open processing line 51.

[0224] Next, the opening gripping portion 57 of the opened removal opening 56 was gripped and pulled apart to both sides, whereby the engagement of the zipper tape 61 could be easily released. In addition, the opening 56 for removal at the top of the package of the resealable paper container 90 was open across almost the entire width of the resealable paper container 90, making it possible to remove the wheat flour filled inside.

[0225] Similarly to Examples 1 to 7, the packages of the chuck-equipped paper container 80 of Comparative Examples 1 to 7 also had the removal opening 856 open across substantially the entire width of the chuck-equipped paper container 80.

[0226] Here, a state in which the zipper tape 61 is released and the top of the zippered paper container 90 is completely open will be considered.

[0227] Fig. 11(a) shows the upper edge of a paper container 80 with a chuck according to the prior art, and Fig. 11(b) shows the upper edge of a paper container 90 with a chuck according to the present disclosure. This figure is created as a schematic diagram and may differ from the actual size.

[0228] Compared to the opening dimension X of the removal opening 856 of the retractable paper container 80 of the prior art, the opening dimension X of the removal opening 56 of the retractable paper container 90 of the present disclosure is larger.

[0229] Note that the comparison here of the opening dimension X of the removal opening of the zippered paper container 80 of the prior art and the zippered paper container 90 of the present disclosure is based on the assumption that all elements other than the reversed arrangement of the male and female attachment positions of the zipper tape 61, such as the laminated sheets 78, 88, the grain of the paper base layers 782, 882 (for convenience of removing the zippered paper container), and the shapes of the zippered paper containers 80, 90, are the same. For example, examples having the same numbers as the Example and Comparative Example have the above relationship. That is, the difference between Example 1 and Comparative Example 1 is whether the male zipper tapes 61m, 861m or the female zipper tapes 61f, 861f are bonded to the front blank plates 10b, 81b.

[0230] The reverse bending stiffness SCS of the zipper tape joint parts 65 and 865 of each of the examples and comparative examples is shown in Table 1. The size of the collected samples was 13 mm x 70 mm.

[0231] [Table 1]

[0232] Furthermore, the measured values ​​of the opening dimension X of the removal opening 56, 856 of the retractable paper container 90, 80 of each Example and Comparative Example are shown in Table 2. All of the measured values ​​were measured for five samples using digital calipers. Figure 11 shows the measurement points of the digital caliper. The size of the removal opening in the depth direction (front and back direction) is indicated by X.

[0233] [Table 2]

[0234] 16(b), when the top of the zippered paper container 90 is opened over substantially the entire width, the rear zipper tape joint portion 65a near the rear first vertical folding line 12a is bent the most and folded in the opposite direction, whereas the front zipper tape joint portion 65b is not bent. Therefore, when determining the shape of the access opening 56, the most force is required to deform the portion where the back zipper tape joint portion 65a is bent. Therefore, it is desirable that the force for bending the back zipper tape joint portion 65a in the reverse direction is small, that is, that the reverse bending stiffness SCSa of the back zipper tape joint portion 65a is small.

[0235] In a paper container with a zipper according to the prior art, of the zipper tapes 861, a female zipper tape 861f having a large reverse bending stiffness SCT of the zipper tape is arranged on the back zipper tape 861a, and a male zipper tape 861m having a small reverse bending stiffness SCT of the zipper tape is arranged on the front zipper tape 61b. In this case, when the removal opening is opened, the back zipper tape joint portion 65a bends in the reverse direction, so in Comparative Example 1, the reverse bending stiffness SCSa of the back zipper tape joint portion 65a is the reverse bending stiffness SCSf of the female zipper tape joint portion 865f, and the measured value was 11.8 mN·m. On the other hand, since the front zipper tape joint portion 865b hardly bends, the reverse bending stiffness SCSb of the front zipper tape joint portion 865b has little relationship with the opening dimension X of the removal opening 856.

[0236] In the zippered paper container 90 of this embodiment, of the zipper tapes 61, the female zipper tape 61f having a large reverse bending stiffness SCT of the zipper tape 61 is arranged on the front zipper tape 61b, and the male zipper tape 61m having a small reverse bending stiffness SCT of the zipper tape 61 is arranged on the back zipper tape 61a.

[0237] In this case, when the removal opening 56 is opened, the back zipper tape joint portion 65a is bent in the reverse direction, so in Example 1, the reverse bending stiffness SCSa of the back zipper tape joint portion 65a is the reverse bending stiffness SCSm of the male zipper tape joint portion 65m, and the measured value was 9.9 mN·m.

[0238] On the other hand, the front zipper tape joint portion 65b hardly bends, and therefore the reverse bending stiffness SCSb of the front zipper tape joint portion 65b has little relationship with the opening dimension X of the removal opening 56, and is therefore not shown in Table 1.

[0239] The reverse bending stiffness STSa of the back zipper tape joint portion 65a of this example was 9.9 mN·m, and the reverse bending stiffness STSa of the back zipper tape joint portion 865a of this comparative example was 11.8 mN·m. Therefore, the reverse bending stiffness STSa of the back zipper tape joint portion 65a of this embodiment was smaller than the reverse bending stiffness STSa of the back zipper tape joint portion 865a of this comparative example.

[0240] Table 2 shows the opening dimension X of the removal opening 56, 856. The opening dimension X is shown by the depth of the removal opening 56, 856 shown in FIG. The opening dimension X in this embodiment is 75 mm, while the opening dimension X in this comparative example is 45 mm, so that the opening 56 for removal is larger in this embodiment, and therefore it was easier to remove the contents with a spoon or the like.

[0241] Example 2 and Comparative Example 2 are compared. In addition, between Example 2 and Comparative Example 2, all elements were the same, except that the attachment positions of the male and female halves of the zipper tapes 61, 861 were reversed, such as the laminated sheets 78, 88, the grain of the paper base layers 782, 882 (for convenience of removing the zippered paper container), and the shapes of the zippered paper containers 90, 80.

[0242] From Table 1, the reverse bending stiffness SCSa of the back zipper tape joint portion 65a of this example was 6.7 mN·m, and the reverse bending stiffness SCSa of the back zipper tape joint portion 865a of this comparative example was 10.4 mN·m. Therefore, the reverse bending stiffness STSa of the back zipper tape joint portion 65a of this embodiment was smaller than the reverse bending stiffness STSa of the back zipper tape joint portion 865a of this comparative example.

[0243] From Table 2, the opening dimension X of this embodiment is 87 mm, and the opening dimension X of this comparative example is 73 mm, so that the opening 56 for removal is larger in this embodiment, and therefore it was easier to remove the contents with a spoon or the like.

[0244] Example 3 and Comparative Example 3 are compared. In addition, between Example 3 and Comparative Example 3, all elements were the same, except that the attachment positions of the male and female halves of the zipper tapes 61, 861 were reversed, such as the laminated sheets 78, 88, the grain of the paper base layers 782, 882 (for convenience of removing the zippered paper container), and the shapes of the zippered paper containers 90, 80.

[0245] From Table 1, the reverse bending stiffness SCSa of the back zipper tape joint portion 65a of this example was 9.4 mN·m, and the reverse bending stiffness SCSa of the back zipper tape joint portion 865a of this comparative example was 11.5 mN·m. Therefore, the reverse bending stiffness STSa of the back zipper tape joint portion 65a of this embodiment was smaller than the reverse bending stiffness STSa of the back zipper tape joint portion 865a of this comparative example.

[0246] From Table 2, the opening dimension X of this embodiment is 92 mm, and the opening dimension X of this comparative example is 71 mm, so that the opening 56 for removal is larger in this embodiment, and therefore it is easier to remove the contents with a spoon or the like.

[0247] Example 4 and Comparative Example 4 are compared. In addition, between Example 4 and Comparative Example 4, all elements were the same, except that the attachment positions of the male and female halves of the zipper tapes 61, 861 were reversed, such as the laminated sheets 78, 88, the grain of the paper base layers 782, 882 (for convenience of removing the zippered paper container), and the shapes of the zippered paper containers 90, 80.

[0248] From Table 1, the reverse bending stiffness SCSa of the back zipper tape joint portion 65a of this example was 7.2 mN·m, and the reverse bending stiffness SCSa of the back zipper tape joint portion 865a of this comparative example was 9.4 mN·m. Therefore, the reverse bending stiffness STSa of the back zipper tape joint portion 65a of this embodiment was smaller than the reverse bending stiffness STSa of the back zipper tape joint portion 865a of this comparative example.

[0249] As can be seen from Table 2, the opening dimension X in this embodiment is 80 mm, while the opening dimension X in this comparative example is 68 mm. Therefore, the removal opening 56 in this embodiment is larger, and it is therefore easier to remove the contents with a spoon or the like.

[0250] Example 5 and Comparative Example 5 are compared. In addition, between Example 5 and Comparative Example 5, all elements were the same, except that the attachment positions of the male and female halves of the zipper tapes 61, 861 were reversed, such as the laminated sheets 78, 88, the grain of the paper base layers 782, 882 (for convenience of removing the zippered paper container), and the shapes of the zippered paper containers 90, 80.

[0251] From Table 1, the reverse bending stiffness SCSa of the back zipper tape joint portion 65a of this example was 9.3 mN·m, and the reverse bending stiffness SCSa of the back zipper tape joint portion 865a of this comparative example was 12.0 mN·m.

[0252] Therefore, the reverse bending stiffness STSa of the back zipper tape joint portion 65a of this embodiment was smaller than the reverse bending stiffness STSa of the back zipper tape joint portion 865a of this comparative example. As can be seen from Table 2, the opening dimension X in this embodiment is 60 mm, while the opening dimension X in this comparative example is 40 mm. Therefore, the opening 56 for removal is larger in this embodiment, and therefore it is easier to remove the contents with a spoon or the like.

[0253] Example 6 and Comparative Example 6 are compared. In addition, in Example 6 and Comparative Example 6, the attachment positions of the male and female halves of the zipper tapes 61, 861 were reversed, but all elements were the same, such as the laminated sheets 78, 88, the grain of the paper base layers 782, 882 (for convenience of removing the zippered paper container), and the shapes of the zippered paper containers 90, 80.

[0254] From Table 1, the reverse bending stiffness SCSa of the back zipper tape joint portion 65a of this example was 6.6 mN·m, and the reverse bending stiffness SCSa of the back zipper tape joint portion 865a of this comparative example was 9.0 mN·m. Therefore, the reverse bending stiffness STSa of the back zipper tape joint portion 65a of this embodiment was smaller than the reverse bending stiffness STSa of the back zipper tape joint portion 865a of this comparative example.

[0255] As can be seen from Table 2, the opening dimension X in this embodiment is 95 mm, while the opening dimension X in this comparative example is 70 mm. Therefore, the opening 56 for removal is larger in this embodiment, and therefore it is easier to remove the contents with a spoon or the like.

[0256] Example 7 and Comparative Example 7 are compared. In addition, between Example 7 and Comparative Example 7, all elements were the same, except that the attachment positions of the male and female halves of the zipper tapes 61, 861 were reversed, such as the laminated sheets 78, 88, the grain of the paper base layers 782, 882 (for convenience of removing the zippered paper container), and the shapes of the zippered paper containers 90, 80.

[0257] From Table 1, the reverse bending stiffness SCSa of the back zipper tape joint portion 65a of this example was 12.3 mN·m, and the reverse bending stiffness SCSa of the back zipper tape joint portion 865a of this comparative example was 15.3 mN·m. Therefore, the reverse bending stiffness STSa of the back zipper tape joint portion 65a of this embodiment was smaller than the reverse bending stiffness STSa of the back zipper tape joint portion 865a of this comparative example.

[0258] As can be seen from Table 2, the opening dimension X in this embodiment is 70 mm, while the opening dimension X in this comparative example is 64 mm. Therefore, the opening 56 for removal is larger in this embodiment, and therefore it is easier to remove the contents with a spoon or the like.

[0259] Also shown are the measurement results of the reverse bending stiffness SCT of the zipper tape 61. The reverse bending stiffness SCTm of the male zipper tape 61m and the reverse bending stiffness SCTf of the female zipper tape 61f are shown in Table 3. The number of samples measured was five for each.

[0260] [Table 3]

[0261] When the grain of the laminated sheets 78 and the paper base layer 782 constituting the front blank plate 10b and the back blank plate 10a are the same, the relationship in magnitude between the reverse bending stiffness SCSb of the front zipper tape joint portion 65b and the reverse bending stiffness SCSa of the back zipper tape joint portion 65a coincides with the relationship in magnitude between the reverse bending stiffness SCTb of the front zipper tape 61b and the reverse bending stiffness SCTa of the back zipper tape 61a.

[0262] In this embodiment, since the grain of the laminated sheet 78 and the paper base layer 782 constituting the front blank plate 10b and the back blank plate 10a is the same, the male zipper tape 61m having a small reverse bending stiffness SCT of the zipper tape 61 is arranged on the back zipper tape 61a, and the female zipper tape 61f having a large reverse bending stiffness SCT of the zipper tape 61 is arranged on the front zipper tape 61b.

[0263] In this case, like the zipper tape joint portion 65, the opening dimension X of the removal opening 56 is larger when the reverse bending stiffness SCTa of the rear zipper tape 61a joined to the rear blank plate 10a is smaller. Note that the rear zipper tape 61a is bent in the reverse direction when the top of the zippered paper container 90 is opened.

[0264] In this embodiment, the male zipper tape 61m has a reverse bending stiffness SCTm of 1.7 mN·m, and the female zipper tape 61f has a reverse bending stiffness SCTf of 2.8 mN·m. Therefore, in this embodiment, the reverse bending stiffness SCTa of the back zipper tape 61a to which the male zipper tape 61m is attached is smaller than the reverse bending stiffness SCTb of the front zipper tape 61b to which the female zipper tape 61f is attached, so that the back zipper tape joint portion 65a can be easily folded, and the opening dimension X of the removal opening 56 can be increased.

[0265] In addition, after removing a portion of the flour, the zipper could be easily reattached and the paper container resealed in each of the packages of the resealable paper container 90 of Examples 1 to 7, allowing the remaining flour to be properly preserved.

[0266] In addition, in the retractable paper containers 90 of Examples 1 to 7, the paper mass ratio to the total mass of the paper container was approximately 60% by mass, which fully satisfied the standard of 51% by mass or more for paper containers. [Explanation of symbols]

[0267] 10a Back blank plate 10b Front blank plate 11 Side edge 12 First vertical fold line 13 Second vertical fold line 17 Top side diagonal fold line 18 Bottom diagonal fold line 21 Upper edge 22 First horizontal fold line 23 Second horizontal fold line 24 Third horizontal fold line 25 Fourth horizontal fold line 26 Lower edge 31 Wall Panel 32 Side plate 33 Top plate 34 Upper overlapping plate 35 Bottom plate 36 Side edge seal allowance 37 Bottom seal 38 Top protruding part (ear) allowance 41 Side plate of the top 43 Bottom side protruding part (ear) allowance 51 Easy-open processed wire 52 Zipper tape joint 53 Upper seal part 56 Removal opening 57 Opening grip 58 Easy peeling processing part 61 Zipper Tape 61a Back zipper tape 61b Outer zipper tape 61m Male Zipper Tape 61f Female zipper tape 62 Zipper Tape Body 62a Back zipper tape body 62b Front zipper tape body 62m Male zipper tape body 62f Female zipper tape body 63 Zipper tape fitting 63a Back zipper tape fitting 63b Front zipper tape fitting 63m Male zipper tape fitting 63f Female zipper tape fitting 65 Zipper tape joint part 65a Back zipper tape joint 65b Front zipper tape joint 65m Male zipper tape joint 65f Female zipper tape joint part 71 Top of zippered paper container 72 Body of a paper container with a zipper 72d Ridge of the torso 73 Bottom of zippered paper container 74 Top protruding part (ear) 75 Bottom protrusion (ear) 77 Notch 78 Laminated Sheet 781 Outermost thermoplastic resin layer 782 Paper base layer 783 Innermost thermoplastic resin layer 784 Middle adhesive layer 785 Barrier Layer 80 Conventional paper container with zipper 81 Prior art blank plate 81a Back blank plate of the prior art 81b Prior art front blank plate 812 First vertical folding line of the prior art 821 Prior art intermediate horizontal fold line (half fold line) 831 Prior art wall panels 833 Conventional top panel 834 Prior art upper overlapping plate 835 Prior art bottom plate 836 Side edge seal of the conventional technology 837 Bottom seal of conventional technology 851 Prior art easy-open processing line 856 Prior art removal opening 861 Prior art zipper tape 861a Conventional zipper tape on the inside 861b Prior art outer zipper tape 861m Conventional Male Zipper Tape 861f Prior art female zipper tape 862 Prior art zipper tape body 862a Prior art zipper tape body 862b Prior art front zipper tape body 862m Conventional male zipper tape body 862f Prior art female zipper tape body 863 Prior art zipper tape fitting 863a Conventional zipper tape fitting on the back 863b Prior art front zipper tape fitting 863m Conventional male zipper tape fitting 863f Prior art female zipper tape fitting 865 Prior art zipper tape joint 865a Prior art back zipper tape joint 865b Prior art front zipper tape joint 865m Prior art male zipper tape joint 865f Prior art female zipper tape joint part 871 Top of a paper container with a zipper according to the prior art 872 Body of a paper container with a zipper according to the prior art 873 Bottom of a zippered paper container of the prior art 874 Top protrusion (ear) of conventional technology 88 Laminated sheet of paper container of the prior art 881 Outermost thermoplastic resin layer of conventional technology 882 Prior art paper base layer 883 Thermoplastic resin layer of the innermost layer of the conventional technology 884 Prior art intermediate adhesive layer 885 Prior Art Barrier Layer 90 A paper container with a zipper according to one embodiment of the present disclosure 91 An intermediate stage of a zippered paper container according to an embodiment of the present disclosure (flat state) 92 An intermediate stage of a zippered paper container according to one embodiment of the present disclosure (in a raised state) 93 Blank plate of one embodiment of the present disclosure E First top intersection (intersection of the first vertical fold line and the first horizontal fold line) F Second top intersection (intersection of the second vertical fold line and the second horizontal fold line) G First bottom intersection (intersection of the first vertical fold line and the fourth horizontal fold line) H Second bottom intersection (intersection of the second vertical fold line and the third horizontal fold line) Reverse bending stiffness of SCS zipper tape joint SCSa Reverse bending stiffness of the back zipper tape joint SCSb Reverse bending stiffness of the zipper tape joint on the front side Reverse bending stiffness of SCSm male zipper tape joint SCSf Reverse bending stiffness of female zipper tape joint SCT Reverse bending stiffness of zipper tape SCTa Reverse bending stiffness of the back zipper tape SCTb Reverse bending stiffness of the zipper tape on the front side SCTm Reverse bending stiffness of male zipper tape SCTf Reverse bending stiffness of female zipper tape X Opening dimensions of the opening of the zippered paper container

Claims

1. A paper container with a zipper is made of two laminated sheets using paper as a base material, and is assembled by joining a front blank plate and a back blank plate having a folding line, A top part including an upper overlapping plate formed by overlapping and joining the front blank plate and the back blank plate to the top of the zipper-equipped paper container, and a top plate connected to the lower side of the upper overlapping plate; A top side plate connected to both left and right ends of the upper overlapping plate; A top portion protruding portion provided on both the left and right sides of the top portion; A body portion provided below the top portion; A bottom portion provided on the lower side of the body portion; An upper seal portion that crosses the upper edge portions or the vicinity of the upper edge portions of the upper overlapping plate and the side plate of the top portion; Located below the upper seal portion and crossing the upper overlapping plate and the side plate of the top portion and a zipper tape, The zipper tape comprises a male zipper tape and a female zipper tape, Either the male zipper tape or the female zipper tape is attached to a front blank plate The other end is joined to the back blank plate, a reverse bending stiffness of a front zipper tape joint portion in which the front zipper tape is joined to the front blank plate is 1.9 mN·m or more greater than a reverse bending stiffness of a back zipper tape joint portion in which the back zipper tape is joined to the back blank plate; The reverse bending stiffness of the front zipper tape joint portion is 15.3 mN·m or less, A paper container with a zipper, characterized in that a first vertical folding line on the back side existing in the longitudinal direction of the back side blank plate and the back side zipper tape joint portion partially overlap each other.

2. The paper container with a zipper as described in claim 1, characterized in that the basis weight of the paper used in the laminated sheet is 80 to 320 g / m 2 .

3. The laminated sheets constituting the front blank plate and the back blank plate are the same, 3. The paper container with a zipper according to claim 1, wherein a reverse bending stiffness of the front zipper tape is greater than a reverse bending stiffness of the back zipper tape.

4. 4. The paper container with a zipper according to claim 1, wherein the front zipper tape is a female zipper tape, and the back zipper tape is a male zipper tape.

5. 5. The paper container with a zipper according to claim 1, wherein an easy-open processing line is provided between the upper seal portion and the zipper tape.

6. An easily peelable portion is provided in an area including the upper seal portion of the front blank plate and the back blank plate, The paper container with a zipper according to any one of claims 1 to 4, characterized in that no easy-open processing line is provided.

Images