Zippered paper container

Abstract

To provide a paper container with a zipper where an engaging part between a male mold and a female mold of a zipper tape is dissociated, making it easy to open the opening of the paper container when the zipper tape is opened.MEANS FOR SOLVING THE PROBLEM: A paper container with a zipper 90 includes a front side blank 10b and a back side blank 10a assembled with each other, which are comprised of a laminated sheet 78 containing a paper material layer 782. There is an opening hook 55 at an upper end part 21 of a zipper tape 61 of at least the front side blank plate 10b and the back side blank plate 10a.SELECTED DRAWING: Figure 7

Description

[Technical Field]

[0001] The present disclosure relates to a paper container with a zipper, particularly in the field of paper containers that have a three-dimensional shape and are self-supporting, and relates to a paper container with a zipper that is easy to open when the male and female mating portions of the zipper tape are disengaged and the zipper tape is opened. [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 spillage 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 have been 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 the top open.

[0004] 2, unless otherwise specified, the front wall panel 831b is the front, and the front, back, left, right, top, and bottom sides of the resealable paper container 80 are indicated. The same applies to the resealable paper container 90 of the present disclosure.

[0005] Furthermore, the reference numerals used when describing the prior art are in the 80s or 800s to distinguish them from the present disclosure. Furthermore, the subscript a of a 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, a symbol without a subscript includes both a and b.

[0006] In the resealable paper container 80 described in Patent Document 1, when the top 871 is opened and the contents are removed, the protruding portion (ear) 874 on the top surface is first removed from the body 872, then the easy-open processing line 851 is cut, and then the male and female mating portions of the zipper tape 861 are released, opening the removal opening 856 (see Figure 3). The contents are then removed through the removal opening 856.

[0007] When opening the zipper tape 861, the user grasps the front opening grip margin 857b above the front zipper tape 861b and the back opening grip margin 857b above the back zipper tape 861a with the fingers of the hand, respectively, and opens the resealable paper container in the front-to-back direction. In this case, the front opening grip margin 857b and the back opening grip margin 857a sometimes overlap, eliminating a gap (see FIG. 15A). This makes it difficult to insert the fingers, making it difficult to release the zipper tape 861, and making it difficult to open the resealable paper container. [Prior art documents] [Patent documents]

[0008] [Patent Document 1] Japanese Patent Application Laid-Open No. 2005-178833 Summary of the Invention [Problem to be solved by the invention]

[0009] The present disclosure has been made to solve the above-mentioned problems, and its objective is to provide a resealable paper container 90 that makes it easy to open the removal opening of the resealable paper container when the male and female mating portions of the resealable tape are disengaged and the resealable tape is opened. [Means for solving the problem]

[0010] The above problems can be solved by the following embodiments of the present disclosure. That is, the resealable paper container 90 of the present disclosure has the following features: In a paper container 90 with a zipper, a blank plate 10 made of a laminated sheet 78 including a paper base layer 782 is assembled. The blank plate 10 includes at least a front blank plate 10b and a back blank plate 10a, A top portion 71 is provided at the top of the zippered 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; Side plates 41 of the top portion connected to both the left and right sides 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; At least one of the front blank plate 10b or the back blank plate 10a has an opening hook 55 on the upper edge 21 side of the zipper tape 61.

[0011] In addition, in the resealable paper container 90 of the present disclosure, An opening hook 55 may be provided on the upper edge 21 side of the zipper tape 61 of both the front blank plate 10b and the back blank plate 10a.

[0012] In addition, in the resealable paper container 90 of the present disclosure, The opening notch 55 may be a ruled line.

[0013] In addition, in the resealable paper container 90 of the present disclosure, The lines of the opening hook 55 may include lines that are concave when viewed from the outside of the resealable paper container 90.

[0014] In addition, in the resealable paper container 90 of the present disclosure, The lines of the opening hook 55 may include lines that are convex when viewed from the outside of the resealable paper container 90.

[0015] In addition, in the resealable paper container 90 of the present disclosure, The opening hook 55 may include a horizontal line extending in the horizontal direction of the resealable paper container 90.

[0016] In addition, in the resealable paper container 90 of the present disclosure, The opening tab 55 may include two or more horizontal lines.

[0017] In addition, in the resealable paper container 90 of the present disclosure, The opening hook 55 may include a vertical line extending in the vertical direction of the resealable paper container 90.

[0018] In addition, in the resealable paper container 90 of the present disclosure, The opening hook 55 includes two or more vertical lines extending in the vertical direction of the resealable paper container 90, The vertical lines may be positioned in the lateral direction of the resealable paper container 90 relative to one another.

[0019] In addition, in the resealable paper container 90 of the present disclosure, The opening hook 55 may include a concave embossed portion that is concave toward the outer side of the resealable paper container 90 .

[0020] In addition, in the resealable paper container 90 of the present disclosure, The opening hook 55 may include a convex embossed portion that is convex toward the outer side of the resealable paper container 90 . [Effects of the Invention]

[0021] According to the above-described embodiment of the present disclosure, the following resealable paper container can be provided. That is, the blank plate 10 of the resealable paper container 90 of the present disclosure has an opening tab 55 on the upper side of the zipper tape 61. When a user opens the top part 71 of the resealable paper container 90 containing the contents, the user first cuts the easy-open processing line 51 on the top part 71 to expose the zipper tape 61.

[0022] Then, the end face of the front side easy-open processed line 51b and / or the end face of the back side easy-open processed line 51a are deformed so as to open outward due to the action of the opening catch 55. As a result, an opening catch gap 58 is formed between the front side opening grip margin 57b above the front side zipper tape 61b and the back side opening grip margin 57a ​​above the back side zipper tape 61a. This makes it easier to insert fingers, and the front side opening grip margin 57b and the back side opening grip margin 57a ​​can be easily grasped with fingers.

[0023] When the front and back opening grip portions 57b and 57a are grasped with the fingers of a hand and the resealable paper container is opened in the front-to-rear direction, the resealable tape 61 is released. Therefore, a resealable paper container 90 can be provided that is easy to open when the user releases the resealable tape 61 of the resealable paper container 90 to remove the contents. [Brief explanation of the drawings]

[0024] [Figure 1] FIG. 1 is a development view of a blank plate 81 used to manufacture a paper container 80 with a zipper according to the prior art. [Figure 2] FIG. 1 is a perspective view of a resealable paper container 80 of the prior art. [Figure 3] 3 is a perspective view of the resealable paper container 80 shown in FIG. 2 with the top part 871 open. [Figure 4A] FIG. 1 is a development view of a front blank plate 10b used to manufacture a resealable paper container 90 according to one embodiment of the present disclosure. [Figure 4B]FIG. 2 is a development view of a back blank plate 10a used to manufacture a resealable paper container 90 according to one embodiment of the present disclosure. [Figure 5] FIG. 5 is a front view showing the shape of a paper container (flat state) 91 at an intermediate stage when a paper container 90 with a zipper is produced using the blank plate 10 shown in FIGS. 4A and 4B. [Figure 6] FIG. 4C is a perspective view showing the shape of a paper container (in a box-formed state) 92 at an intermediate stage when a paper container 90 with a zipper is produced using the blank plate 10 shown in FIGS. 4A and 4B. [Figure 7] FIG. 4C is a perspective view of a resealable paper container 90 produced using the blank plate 10 shown in FIGS. 4A and 4B. [Figure 8] FIG. 8 is a side view of the resealable paper container 90 shown in FIG. 7. [Figure 9] FIG. 8 is a plan view of the resealable paper container 90 shown in FIG. 7. [Figure 10] FIG. 10 is a perspective view of a resealable paper container 93 with the top seal portion removed. [Figure 11] 11 is a perspective view of the resealable paper container 93 shown in FIG. 10 with the top seal portion cut off and the top portion 71 open. FIG. [Figure 12A] 1 is a cross-sectional view of a laminated sheet 78 of one embodiment of the blank plate 10. FIG. [Figure 12B] 10 is a cross-sectional view of a laminated sheet 78 of another embodiment of the blank plate 10. FIG. [Figure 12C] 10 is a cross-sectional view of a laminated sheet 78 of still another embodiment of the blank plate 10. FIG. [Figure 12D] 10 is a cross-sectional view of a laminated sheet 78 of still another embodiment of the blank plate 10. FIG. [Figure 13A] 5 is a partially enlarged view of a resealable paper container 90 in an intermediate stage (flat state) of the first mode of the first embodiment (enlarged view of part A in FIG. 5). [Figure 13B] 5 is a partially enlarged view of a resealable paper container 90 in an intermediate stage (flat state) according to a second aspect of the first embodiment (enlarged view of part A in FIG. 5). [Figure 13C]5 is a partially enlarged view of a resealable paper container 90 in an intermediate stage (flat state) according to a third aspect of the first embodiment (enlarged view of part A in FIG. 5). [Figure 14A] 5 is a partially enlarged view of a paper container (flat state) at an intermediate stage of a resealable paper container 90 according to a first aspect of the second embodiment and a first aspect of the fourth embodiment (enlarged view of part A in FIG. 5). [Figure 14B] 5 is a partially enlarged view of a paper container (flat state) at an intermediate stage of a resealable paper container 90 according to a second aspect of the second embodiment and a second aspect of the fourth embodiment (enlarged view of part A in FIG. 5). [Figure 14C] 5 is a partially enlarged view of a paper container (flat state) at an intermediate stage of a resealable paper container 90 according to a first aspect of the third embodiment and a first aspect of the fifth embodiment (enlarged view of part A in FIG. 5). [Figure 14D] 5 is a partially enlarged view of a paper container (flat state) at an intermediate stage of a resealable paper container 90 according to a second aspect of the third embodiment and a second aspect of the fifth embodiment (enlarged view of part A in FIG. 5). [Figure 15A] 10 is an end view of the top edge of a resealable paper container 80 of the prior art, in which the top seal portion has been removed (the view is the same as the view of arrow B in FIG. 10). [Figure 15B] 11 is a cross-sectional view of the upper overlapping plate 34 at the cross-sectional position DD shown in FIG. 10 in the resealable paper container 90 of the first aspect of the first embodiment. FIG. [Figure 15C] 10 is an end view of the upper edge portion 21 of the resealable paper container 93 in the first aspect of the first embodiment and the resealable paper container 90 in the second aspect of the first embodiment, with the upper seal portion of FIG. 10 removed (see arrow B in FIG. 10). [Figure 15D] 10 is an end view of the upper edge portion 21 of the resealable paper container 93 in the resealable paper container 90 of the third aspect of the first embodiment, with the upper seal portion of FIG. 10 cut off (see arrow B in FIG. 10). [Figure 16A] 10 is an end view of the upper edge portion 21 of the resealable paper container 93 of the first aspect of the second embodiment, in which the upper seal portion of FIG. 10 has been removed (see arrow B in FIG. 10). [Figure 16B] 10 is an end view of the upper edge portion 21 of the resealable paper container 93 from which the upper seal portion of FIG. 10 has been removed in the resealable paper container 90 of the second aspect of the second embodiment (see arrow B in FIG. 10). [Figure 16C] 10 is an end view of the upper edge portion 21 of the resealable paper container 93 of the first aspect of the third embodiment, in which the upper seal portion of FIG. 10 has been removed (see arrow B in FIG. 10). [Figure 16D] 10 is an end view of the upper edge portion 21 of the resealable paper container 93 of the second aspect of the third embodiment, in which the upper seal portion of FIG. 10 has been removed (see arrow B in FIG. 10). [Figure 17A] 10 is an end view of the upper edge portion 21 of the resealable paper container 93 of the first aspect of the fourth embodiment, in which the upper seal portion of FIG. 10 has been removed (see arrow B in FIG. 10). [Figure 17B] 10 is an end view of the upper edge portion 21 of the resealable paper container 93 in the second aspect of the fourth embodiment, in which the upper seal portion of FIG. 10 has been removed (see arrow B in FIG. 10). [Figure 17C] 10 is an end view of the upper edge portion 21 of the resealable paper container 93 of the first aspect of the fifth embodiment, in which the upper seal portion of FIG. 10 has been removed (see arrow B in FIG. 10). [Figure 17D] 10 is an end view of the upper edge portion 21 of the resealable paper container 93 in the second aspect of the fifth embodiment, in which the upper seal portion of FIG. 10 has been removed (see arrow B in FIG. 10). [Figure 18A] 5 is an enlarged cross-sectional view of one embodiment of a joining portion between a blank plate 10 and a zipper tape 61 (see cross-sectional position CC in FIG. 5). [Figure 18B] 5 is an enlarged cross-sectional view of another embodiment of the joining portion between the blank plate 10 and the zipper tape 61 (see cross-sectional position CC in FIG. 5). DETAILED DESCRIPTION OF THE INVENTION

[0025] The present disclosure will be described below with reference to the drawings, but the present disclosure is not limited to the specifically illustrated embodiments or various specifically described structures. In each drawing, the size and proportions of the components may be changed or exaggerated for ease of understanding. Also, for clarity, unnecessary parts and repeated reference numerals may be omitted.

[0026] Furthermore, 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 selected and used as appropriate. In this specification, terms specifying shapes or geometric conditions, such as parallel, orthogonal, and perpendicular, are intended to include not only their strict meanings but also substantially the same state.

[0027] The blank plate 10 of the resealable paper container 90 of the present disclosure is formed into a rectangular outer shape using a laminated sheet 78 in which a paper base layer 782 is laminated, a paper base protective layer 788 is laminated to one of the outer layers of the paper base layer 782, and a thermoplastic resin such as polyethylene is laminated as at least the innermost layer, and various folding lines are provided in the blank plate 10 to separate the forming plates of each part required to form the resealable paper container 90.

[0028] <First aspect of the first embodiment> <Blank board> The blank plates 10 of the resealable paper container 90 of this embodiment are shown in Figures 4A and 4B. Figure 4A shows the back blank plate 10a, and Figure 4B 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 10.

[0029] Unless otherwise specified, in each component of the blank plate 10 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.

[0030] The rear upper edge 21a, which is the bottom side of the rear blank plate 10a in FIG. 4A, becomes the top side of the resealable paper container 90. The front-side upper edge portion 21b of the front-side blank plate 10b in FIG. 4B, which is the upper side in the drawing, becomes the upper side of the resealable paper container 90.

[0031] In both Figures 4A and 4B, the front side of the drawing is the outer side when the resealable paper container 90 is assembled, and the back side is the inner side. Figures 4A and 4B are symmetrical with respect to the upper edge portions 21a and 21b, respectively, except for some components (such as the opening tab 55, which will be described later). When the inner surfaces of the back blank plate 10a and the front blank plate 10b are aligned and overlapped, the components (such as the forming plates, lines, seal portions, and zipper tape joints, which will be described later) overlap.

[0032] The back blank plate 10a and the front blank plate 10b are aligned and stacked and joined together 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 (boxed state) 92 as shown in Figure 6 is produced, and the steps proceed towards completing the paper container with a zipper 90; this manufacturing method will be described later.

[0033] Unless otherwise specified, the top, bottom, left, and right of the front blank plate 10b will be indicated with reference to Figure 4B. 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 4A. In the resealable paper container 90, the upper edge 21 side is the upper side, and the lower edge 26 side is the lower side.

[0034] As will be explained later, the formed resealable paper container 90 is composed of, in order from the top, a top section 71, a body section 72, and a bottom section 73, and the top section may be referred to as the top section, and the bottom section may be referred to as the bottom section (see FIG. 7). Furthermore, 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.

[0035] As described above, the rear blank plate 10a and the front blank plate 10b are substantially symmetrical in shape vertically, so the blank plate 10 will be described with reference to the front blank plate 10b. The rear blank plate 10a and the front blank plate 10b are also made of the same material (layer structure) and are manufactured by the same method.

[0036] The front blank plate 10b of the resealable paper container 90 of this embodiment has a substantially rectangular outer shape and is made of a laminated sheet 78 having at least a base paper layer and a thermoplastic resin such as polyethylene as at least the innermost layer. Referring to Fig. 4B, the top side is the front top edge 21b, the left and right sides are the front side side edges 11b, and the bottom side is the front bottom edge 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 will be described later.

[0037] The front blank plate 10b is provided with 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, which are arranged in the transverse direction in this order from the front upper edge 21b. These front side horizontal folding lines 22b, 23b, 24b, 25b are preferably parallel to the front side upper edge 21b and the front side lower edge 26b, respectively.

[0038] The front blank plate 10b is provided with, in order from the left side, a front first vertical bending line 12b, a front second vertical bending line 13b, a front second vertical bending line 13b and a front first vertical bending 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 desirable that the front longitudinal folding lines 12b, 13b are each substantially parallel to the side edge 11b of the front blank plate 10b.

[0039] 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 to form the zippered paper container 90 are divided and configured.

[0040] The oblique folding line 17b on the top of the front side starts from the intersection Fb of the second vertical folding line 13b on the front side and the second horizontal folding line 23b on the front side. Furthermore, the diagonal fold line 17b on the front side connects the second top intersection Fb on the front side with the first top intersection Eb on the front side, which is the intersection of the first vertical fold line 12b and the first horizontal fold line 22b on the front side, and extends to the side edge 11b on the front side. The intersection of the side edge 11b and the diagonal fold line 17b on the front side is the end point of the diagonal fold line 17b on the front side.

[0041] The front bottom diagonal fold line 18b starts from 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. Furthermore, the diagonal bottom fold line 18b connects the second bottom intersection point Hb with the first bottom intersection point Gb, which is the intersection point of the first vertical fold line 12b and the fourth horizontal fold line 25b, and extends to the side edge 11b. The intersection point of the side edge 11b and the diagonal bottom fold line 18b is the end point of the diagonal bottom fold line 18b.

[0042] The diagonal folding line 17b on the top side of the front side may be located near the intersection point Fb of the second top side of the front side without contacting it.Furthermore, the diagonal folding line 18b on the bottom side of the front side may be located near the intersection point Hb of the second bottom side of the front side without contacting it.

[0043] Furthermore, the oblique fold line 17b on the top side of the front side does not contact the intersection point Eb of the first top side of the front side, and may not exist in the vicinity thereof. Alternatively, the oblique fold line 17b on the top side of the front side may not exist between the intersection point Eb of the first top side of the front side and the side edge portion 11b of the front side. Furthermore, the oblique fold line 18b on the front bottom side does not contact the front first bottom intersection point Gb and may not be present in the vicinity thereof. Alternatively, the oblique fold line 18b on the front bottom side may not be present between the front first bottom intersection point Gb and the front side edge portion 11b.

[0044] By positioning the above-mentioned oblique folding lines of each front side and each intersection point close to each other without touching, sufficient folding performance is maintained while there is no excessive concentration of folding lines at any particular location, and a decrease in the strength of the laminated sheet of the front side blank plate 10b can be prevented.

[0045] On both the left and right side edges 11b of the front blank plate 10b, front side edge seal margins 36b are formed via the front first vertical folding lines 12b.

[0046] A front bottom seal margin 37b is formed at the front lower edge 26b located below the front blank plate 10b via the front fourth horizontal folding line 25b.

[0047] Further, the front blank plate 10b is provided with forming plates for each part in succession downward from the front upper edge 21b located at the top.

[0048] Regarding the main components, a front upper overlapping plate 34b is provided below the central region of 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.

[0049] Further, side plates 41b of the top portion of the front side are connected to the outside of both the left and right sides of the upper overlapping plate 34b of the front side via the second vertical folding line 13b of the front side.

[0050] Furthermore, front top protruding portions 38b are connected to the outside of both the left and right sides of the front top panel 33b via the front second vertical folding lines 13b.

[0051] Further, the front side panel 32b is connected to the outside of both the left and right sides of the front wall panel 31b via the front second vertical bending line 13b.

[0052] Further, front bottom protruding portions 43b are connected to the outside of both the left and right sides of the front bottom panel 35b via the front second vertical folding lines 13b.

[0053] Additionally, a front top protrusion margin 38b is connected to the bottom of each of the top side panels 41b via a first front horizontal bending line 22b. A front side panel 32b is connected to the bottom of each of the top protrusion margins 38b via a second front horizontal bending line 23b. A front bottom protrusion margin 43b is connected to the bottom of each of the side panels 32b via a third front horizontal bending line 24b.

[0054] Bottom seal margins 37b are connected to the lower sides of the front bottom plate 35b and the front bottom protruding margins 43b on both the left and right sides thereof.

[0055] The front side side edge seal margin 36b is connected to the left and right outer sides of the above-mentioned side panel 41b of the front top, the front top protruding margin 38b, the front side panel 32b, and the front bottom protruding margin 43b via the front first vertical fold line 12b.

[0056] Furthermore, on the upper side of the front zipper tape joint 52b, a front concave horizontal ruled line 551b is provided as a front opening hook 55b, which at the shortest crosses between the front second vertical fold lines 13b on both the left and right sides.

[0057] In this embodiment, the process of providing folding lines to the blank sheet 10 (creasing process) is performed after the laminated sheet 78 is completed, and then the laminated sheet is fed to a machine that manufactures the resealable paper containers 90. Alternatively, the creasing process may be performed in the machine that manufactures the resealable paper containers 90.

[0058] 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. 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.

[0059] Next, a punching process for punching the laminated sheet 78 to produce the blank plate 10 will be described. For the punching process, an appropriate method is selected from known methods such as a platen method or a rotary die method. The blank plate 10 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, and they can be done simultaneously.

[0060] Alternatively, a roll of laminated sheet 78 slit to a predetermined roll width may be fed to a machine that manufactures resealable paper containers 90, and the roll of laminated sheet 78 may be cut in the cross direction to produce blank plate 10.

[0061] The rear blank sheet 10a and the front blank sheet 10b are symmetrical and have the same shape. In other words, they are blank sheets of almost the same shape but with the layer structure reversed.

[0062] Figure 5 is a front view showing the shape of a resealable paper container (flat state) 91 at an intermediate stage when manufacturing a resealable paper container 90 using the blank plates 10 shown in Figures 4A and 4B. The top is the upper edge 21b of the front blank plate 10b shown in Figure 4B, 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 approximately the same shape as the front blank plate 10b.

[0063] In Figure 5, the back blank plate 10a and the front blank plate 10b are overlapping, and each component has the same positional relationship when viewed through the drawing, within the range of manufacturing variations, so the front notation and subscripts may be omitted in the explanation.

[0064] An enlarged view of the upper part of the resealable paper container (flat state) 91 at an intermediate stage is shown in Fig. 13A. This is an enlarged view of the area A shown in Fig. 5. On the upper side of the zipper tape 61, a horizontal concave line 551 is provided that crosses between the left and right side edge portions 11. The horizontal concave line 551 is one aspect of the opening trigger 55 described later.

[0065] The upper overlapping plate 34 and the side plate 41 on the top of the front side are provided with an upper seal portion 53 as a transverse sealing means, an easy-open processing line 51, a recessed horizontal line 551, and a zipper tape joint portion 52, in that order from the upper edge 21, at a predetermined position where the two blank plates 10 mentioned above overlap each other.

[0066] 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 . If 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 occurs in the blank plate 10.

[0067] The upper seal portion 53, which serves 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 across the entire width of the upper edge 21 of the resealable paper container 90 or the vicinity of the upper edge 21, so that the resealable paper container 90 remains airtight.

[0068] Additionally, it is desirable that the upper seal portion 53 be approximately parallel to the upper edge portion 21. Furthermore, 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 take out the contents. Also, the length of the zipper tape 61 can be shortened.

[0069] <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 may be provided with a front easy-open processing line 51b as an opening means. By providing the easy-open processing line 51b, the resealable paper container 90 can be opened without using a tool such as scissors.

[0070] As shown in FIG. 5, the easy-open processing line 51 extends from one side edge 11 to the other side edge 11 of the blank sheet 10 and exists between the upper seal portion 53 and the recessed horizontal line 551 .

[0071] 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. By providing the notch 77, initial opening becomes easier.

[0072] 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, exposing the zipper tape 61.

[0073] When an intermittent half-cut line or a straight half-cut line is used for the easy-to-open processing line 51 of the opening means, it may be formed using a normal blade method, but by using a method that uses laser light irradiation, a method that uses ultrasonic waves, or a method called diamond cutting, it is possible to form a half-cut line with greater precision and stability.

[0074] Moreover, easy-open processing line 51 may be in the shape of a strip having a certain width. Moreover, a plurality of easy-open processing lines 51 may be provided. By providing a plurality of easy-open processing lines 51, it is possible to prevent easy-open processing lines 51 from being cut off in an undesired manner.

[0075] Note that 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, the package may still be able to be opened by hand.

[0076] Furthermore, if the easy-open processing line 51 is not provided as described above, the container may be opened with a blade such as scissors. In this case, the intended opening line may be indicated by printing. The printing position may be the position of the easy-open processing line 51 shown in Figures 4A and 4B. The intended opening line may not be clearly indicated on the resealable paper container 90, but may be indicated in an attached instruction manual or the like.

[0077] <Zipper tape> The zipper tape 61 is formed by extrusion molding a male zipper tape 61m and a female zipper tape 61f, and a male zipper tape fitting portion 63m and a female zipper tape fitting portion 63f are fitted together.

[0078] <Zipper tape joining procedure> The procedure for assembling the zippered paper container 90 will be explained later, but here, the procedure for joining the zipper tape 61 will be explained.

[0079] In this case, the zipper tape joint portion 52 is a portion to be joined with the zipper tape 61 when assembling the zippered paper container 90.

[0080] The rear blank sheet 10a and the front blank sheet 10b are overlapped, and the side edge seal margins 36 are heat-sealed together, and the upper seal portions 53 are heat-sealed together. At this time, the zipper tape 61, which has previously been fitted between the male zipper tape 61m and the female zipper tape 61f and the male zipper tape fitting portion 63m and the female zipper tape fitting portion 63f, is inserted into this portion. At the same time, the zipper tape joint portions 52 of the two blank sheets 10 are heated and pressurized from the outer surfaces thereof. The blank sheets 10 and the zipper tapes 61 are then heat-sealed (see FIGS. 18A and 18B).

[0081] The fastener tape 61 may be joined to the blank plate 10 by other methods than the heat sealing described above, such as by using an adhesive or adhesive tape.

[0082] By heat-sealing the zipper tape 61 in this manner, there is less misalignment of 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 portion 52, and the attachment process is simplified, so that the zipper tape 61 can be attached with high production efficiency.

[0083] <Blank plate laminate sheet> As mentioned above, the laminated sheet 78 used for the blank plate 10 is a laminated sheet 78 that has at least a paper base layer 782 laminated thereon and at least the innermost thermoplastic resin layer 783 laminated thereon with a thermoplastic resin such as polyethylene, but if necessary, the intermediate layer can be provided with a barrier layer 785 against water vapor, oxygen, and other substances, or a strength-enhancing layer.

[0084] The paper base layer 782 will now be described. 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 is not particularly limited thereto, and an appropriate material can be selected and used in consideration of water resistance (size) and other factors depending on the contents to be filled into the resealable paper container 90. As specific examples, high-quality 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.

[0085] This section explains the thermoplastic resin layer (sealant layer) used in the innermost layer, and, if necessary, the outermost and intermediate layers. Resins that can be used for the thermoplastic resin layer (sealant layer) include low-density polyethylene (LDPE), linear low-density polyethylene (LLDPE), medium-density polyethylene (MDPE), high-density polyethylene (HDPE), ethylene-α-olefin copolymers polymerized using single-site catalysts, ethylene-vinyl acetate copolymer (EVA), ethylene-acrylic acid copolymer (EAA), ethylene-methacrylic acid random copolymer (EMAA), ethylene-methyl acrylate copolymer (EMA), ethylene-ethyl acrylate copolymer (EEA), ionomers, polypropylene and its copolymers, and polyester-based resins. The most suitable resin can be selected from these depending on the contents to be filled and the storage and usage conditions.

[0086] Of the thermoplastic resins mentioned above, 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 sealing properties. They also have excellent thin-film formability, making it 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. This reduces the proportion of plastic material used and also offers cost benefits.

[0087] The thermoplastic resin layers (sealant layers) of the innermost layer and, if necessary, the outermost layer and intermediate layer can be laminated by extrusion coating the resin on the laminate surface after subjecting the laminate 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 then laminating the film by using a known dry lamination or extrusion lamination (sandwich lamination) or the like.

[0088] When a barrier layer 785 is laminated as an intermediate layer of the laminate sheet 78, a metal foil such as aluminum foil, or a vapor-deposited film of a metal or inorganic oxide such as aluminum, silica, or alumina vapor-deposited to a thickness of 20 to 100 nm on a base film such as a biaxially oriented PET film, a biaxially oriented nylon film (ONy film), or a biaxially oriented polypropylene film (OPP film) can be used as the barrier layer 785. Alternatively, a saponified ethylene-vinyl acetate copolymer (hereinafter sometimes referred to as EVOH) film, a biaxially oriented nylon MXD6 film, a polyacrylonitrile film, or a PET film, ONy film, or OPP film provided with a coating layer of polyvinylidene chloride can be used.

[0089] Such a barrier layer 785 is usually preferably laminated on the inner surface of the paper base layer 782 in order to effectively utilize its barrier properties, but if 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 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 methods such as dry lamination or extrusion lamination (sandwich lamination).

[0090] The layer structure of the laminated sheet 78 of the blank plate 10 of the resealable paper container 90 of this embodiment is illustrated in Figures 12A, 12B, 12C, and 12D.

[0091] FIG. 12A is a cross-sectional view of a laminated sheet 78 of the blank plate 10 made up of three layers, and the layer structure is as follows, with " / " indicating the boundary between adjacent layers. (Outer surface) Outermost thermoplastic resin layer 781 / Paper base layer 782 / Innermost thermoplastic resin layer 783 (inner surface)

[0092] FIG. 12B is a cross-sectional view of a laminated sheet 78 of the blank plate 10 made up of two layers, and the layer structure is as follows. (Outer surface) Paper base layer 782 / Innermost thermoplastic resin layer 783 (Inner surface) This is a layer structure obtained by excluding the outermost thermoplastic resin layer 781 from the three-layer blank plate 10 shown in FIG. 12A.

[0093] Furthermore, when the blank plate 10 is required to have barrier properties (water vapor, oxygen, aroma retention, etc.), it can be provided with a barrier layer 785. Fig. 12C is a cross-sectional view of a laminated sheet 78 of the blank plate 10 consisting of five layers, and the layer structure is as follows. (Outer surface) Outermost thermoplastic resin layer 781 / Paper base layer 782 / Middle adhesive layer 784 / Barrier layer 785 / Innermost thermoplastic resin layer 783 (Inner surface)

[0094] FIG. 12D is a cross-sectional view of a laminated sheet 78 of the blank plate 10 made up of four layers, the layer structure of which is as follows: (Outer surface) Paper base layer 782 / Intermediate adhesive layer 784 / Barrier layer 785 / Innermost thermoplastic resin layer 783 (inner surface) This is a layer structure obtained by excluding the outermost thermoplastic resin layer 781 from the five-layer blank plate 10 shown in FIG. 12C.

[0095] The layers of the laminated sheets 78 are bonded together by known methods such as dry lamination, extrusion coating, adhesives, etc. Note that the layers used for bonding the layers together may not be shown because they are thin.

[0096] <Production of paper containers with zippers> Below is an outline of the steps from the blank plate 10 of the resealable paper container 90 to an intermediate stage resealable paper container (flat state) 91, to the intermediate stage resealable paper container (boxed state) 92, and finally to the completion of a package of the resealable paper container 90 filled with the contents.

[0097] <Creating intermediate paper containers with zippers (flat state)> When the two blank sheets 10 are overlapped, a zipper tape 61 having a male zipper tape 61m and a female zipper tape 61f fitted together is inserted into the position where the zipper tape joints 52 overlap, and the outer surfaces of the two blank sheets 10 are heated and pressurized to heat-seal the zipper tape joints 52.

[0098] Next, the inner surfaces of the upper seal portions 53 are heat-sealed, and the inner surfaces of the seal margins 36 on the side edges adjacent to the side edge portions 11 of the blank plate 10 are heat-sealed. Then, the intermediate stage resealable paper container (flat state) 91 is formed into a bag shape with the lower edge portion 26 open.

[0099] Also, a notch 77 may be provided at each end (at the points where the easy-open processing line 51 abuts the side edges on both sides) of the easy-open processing line 51. The notch 77 may be provided at either one of the ends.

[0100] The actual manufacturing method of the resealable paper container 90 is not particularly limited, but to improve productivity, a device may be used that assembles the paper container, fills the contents, and seals each joint in-line.

[0101] 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, folding lines can be processed, zipper tape 61 can be inserted and heat-sealed, the side edge seal margins 36 can be heat-sealed, the upper seal portion 53 can be heat-sealed, and notches 77 can be punched.

[0102] It should be noted that the order of the steps may be other than that described above, provided that the desired resealable paper container 90 can be obtained.

[0103] 18A and 18B show enlarged cross-sectional views of the joining portion of the zipper tape 61, where the zipper tape 61 and the blank sheet 10 are joined in the zippered paper container (flat state) 91 at an intermediate stage. The cut portion is shown at cross-sectional position CC in Fig. 5. Here, the blank sheet 10 is exemplified by the four-layer laminated sheet 78 in Fig. 12D.

[0104] 18A, a female zipper tape 61f is joined to a front blank plate 10b as a front zipper tape 61b. The female zipper tape 61f includes a female zipper tape body 62f joined to the blank plate 10b and a female zipper tape fitting portion 63f having a recess that fits with the male zipper tape 61m. A male zipper tape 61m is joined to the back blank plate 10a as the back zipper tape 61a. The male zipper tape 61m includes a male zipper tape body 62m joined to the blank plate 10a and a male zipper tape fitting portion 63m having a protrusion that fits with the female zipper tape 61f.

[0105] 18B, a male zipper tape 61m is joined to a front blank plate 10b as a front zipper tape 61b. The male zipper tape 61m includes a male zipper tape body 62m joined to the blank plate 10 and a male zipper tape fitting portion 63m having a protrusion that fits with a female zipper tape 61f. A female zipper tape 61f is joined to the back blank plate 10a as the back zipper tape 61a. The female zipper tape 61f includes a female zipper tape body 62f joined to the blank plate 10a and a female zipper tape fitting portion 63f having a recess that fits with the male zipper tape 61m.

[0106] Whether the male zipper tape 61m or the female zipper tape 61f is joined to the front blank plate 10b is selected appropriately depending on the required performance of the zippered paper container 90 and the specifications of the manufacturing equipment for the zippered paper container 90.

[0107] <Creating a paper container with a zipper (in an erected state) at the intermediate stage> A mandrel is inserted through the opening at the bottom 73 of this intermediate stage zippered paper container (flat state) 91, leaving the upper overlapping plate 34, and the top plate 33 below it is spread out front and back along the first horizontal fold line 22, causing the upper overlapping plate 34 to stand upward.

[0108] 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 outer side of the body portion 72.

[0109] Below the upper overlapping plate 34, a top portion 71 formed by the top panel 33 and a flat body portion 72 are formed, and the bottom portion 73 opens in a generally rectangular shape to form an intermediate stage resealable paper container (standing state) 92. At this stage, the upper overlapping plate 34 stands upright as shown in Figure 6.

[0110] In the design, the horizontal cross-sectional shape of the body 72 and the shape of the opening of the bottom 73 are assumed to be rectangular, but since the resealable paper container 90 is made of a flexible laminated sheet 78 mainly made of paper, they are made approximately rectangular, even if they are not completely rectangular.

[0111] <Forming and filling of paper containers with zippers> Next, the upper overlapping plate 34 standing upward is bent to the back side (towards the back top panel 33a) and laid down, and the top protrusions 74 protruding on both the left and right sides are bent towards the side panels 32 and joined to the body 72. At this time, the bending portion 76 of the top side protrusion 74 is bent, but in order to ensure that the bending process of the top side protrusion bending line 15 of the top side 71 is carried out, an auxiliary member may be brought into contact with the vicinity (including abutment) of the top side protrusion bending line 15 from the inner and / or outer side of the top side 71.

[0112] The top protrusion 74 may be joined to the body 72 by using an adhesive (hot melt, etc.), adhesive tape, mechanical joining (engagement, joining tools), etc. Also, if a thermoplastic resin layer (sealant layer) is provided on the outermost layer of the blank plate 10, the thermoplastic resin layer (sealant layer) may be heat-sealed. The same method is used for joining the bottom side protrusion 75, which will be described later.

[0113] The tip of the top-side protrusion 74 may be joined to the body 72 of the resealable paper container 90. In addition, a portion of the top-side protrusion 74 other than the tip may be joined to the body 72 of the resealable paper container 90. In that case, the tip of the top-side protrusion 74 does not need to be joined to the body 72 of the resealable paper container 90.

[0114] The bottom 73 of the intermediate stage resealable paper container (standing state) 92 formed as described above is turned upward, and the contents are filled through the open bottom 73. Next, the bottom 73 is folded and the seal margins 37 on the bottom side are heat sealed using a palm-to-palm seal method.

[0115] Then, the joined bottom side seal margin 37 is folded and laid on the back side (towards the back side bottom panel 35a), and the bottom side protrusions 75 protruding on both the left and right sides are folded and joined towards the bottom panel 35, thereby completing the packaging of the approximately rectangular shaped resealable paper container 90.

[0116] Fig. 7 is a perspective view showing a resealable paper container 90 of this embodiment. Fig. 8 is a side view of the resealable paper container 90 shown in Fig. 7. Fig. 9 is a plan view of the resealable paper container 90 shown in Fig. 7.

[0117] The resealable paper container 90 shown in FIG. 7 has an outer shape formed into a substantially rectangular parallelepiped, and has a ridge portion 72d on its body portion 72. Since the resealable paper container 90 is made of a flexible laminated sheet 78 mainly made of paper, it does not have a perfect rectangular parallelepiped shape, and is therefore made to have an approximately rectangular parallelepiped shape.

[0118] <Opening operation for removing zippered paper containers> The procedure for opening the top part 71 of the completed package of the resealable paper container 90 containing the contents in order to remove the contents will be described. First, the top protrusion 74 joined to the body 72 is peeled off. Then, as the top protrusion 74 is lifted upward, the top side plate 41 stands up, and accordingly the upper overlapping plate 34 also stands up. The top side plate 41 and the upper overlapping plate 34 then form approximately the same plane.

[0119] Then, the easy-open processing line 51 is manually opened starting from the notch 77 provided on one side (here, the right side) of the side edge 11, and is cut all the way to the other side edge 11 (here, the left side). Then, the top seal portion 53 is cut off. At this stage, the zipper tape 61 has not yet been released, and the shape is as shown in Fig. 10, and this shape is called a resealable paper container 93 with the top seal portion cut off.

[0120] FIG. 15C shows a cross section of the resealable paper container 93 from which the top seal has been cut off, taken along the easy-open processing line 51, as viewed from the direction of the arrow B shown in FIG. An opening catch gap 58 is formed between the front opening grip margin 57b and the back opening grip margin 57a. This is because the presence of a concave horizontal line 551 that crosses between the left and right side edge portions 11, which is one aspect of the opening catch margin 55, causes each of the opening catch margins 57 above the concave horizontal line 551 to deform outward (in the direction away from each other). The opening catch margin 55 will be described in detail later. Since the fingers can be easily inserted into the opening trigger gap 58, the zipper tape 61 can be easily released.

[0121] Next, the front side opening gripping area 57b between the front side easy-open processing line 51b and the front side zipper tape 61b, and the back side opening gripping area 57a between the back side easy-open processing line 51a and the back side zipper tape 61a are grasped with the hands and spread outward of the resealable paper container 90, thereby opening the zipper tape 61 exposed at the easy-open processing line 51. Figure 11 shows the resealable paper container 90 with the top part 71 open.

[0122] During this opening operation of the zipper tape 61, the end of the zipper tape 61 on the side edge portion 11 side of each blank sheet 10 opens over substantially the entire width up to the seal margin 36 on each side edge portion. As described above, the male zipper tape 61m and the female zipper tape 61f of the zipper tape 61 are separated, thereby forming the removal opening 56.

[0123] <Opening tab> The opening catch 55 will now be described. When a user opens the top 71 of the resealable paper container 90 containing the contents, the user first cuts the easy-open processing line 51 on the top 71 to expose the resealable tape 61. Then, the user grasps the front and back opening grip portions 57b and 57a with the fingers of the hand and opens the resealable paper container in the front-to-back direction, whereby the resealable tape 61 is released.

[0124] At this time, if an opening gap 58 is formed between the front opening grip portion 57b and the back opening grip portion 57a, it becomes easy to insert a finger therethrough, and the zipper tape 61 becomes easy to release. Furthermore, by providing the opening notch 55 on the upper side of the zipper tape 61, an opening notch gap 58 is more likely to be created when the easy-open processing line 51 is cut.

[0125] In this embodiment, a concave horizontal ruled line 551 that crosses between the left and right side edge portions 11 is exemplified as one embodiment of the opening catch 55. By providing the concave horizontal ruled line 551 that is concave when viewed from the outside of the resealable paper container 90 on the upper side of the zipper tape 61, the opening grip margin 57 between the zipper tape 61 and the easy-open processing line 51 deforms in the direction of opening in the front-to-rear direction. As a result, an opening catch gap 58 is formed between the front side opening grip margin 57b and the back side opening grip margin 57a.

[0126] Fig. 15A is an end view of the upper edge of a resealable paper container with the top seal removed according to the prior art. Fig. 10 is a view of the resealable paper container 90 of the present disclosure, and is also used as a reference in the description herein. Fig. 15A is a view seen from the direction of arrow B in Fig. 10.

[0127] In FIG. 15A, side edge seal margins 836 are shown on both the left and right side edges, with a first vertical folding line 812 on the inside thereof and a second vertical folding line 813 on the inside thereof. Between the left and right second vertical folding lines 813 there is an upper overlapping plate 834, which is cut along the easy-to-open processing line 851, revealing the opening grip 57 left on the zipper tape 861 side.

[0128] 15A, the front and back opening grip portions 57a and 57b are in contact or close to each other, and there is no gap between them, or even if there is, it is very small, making it difficult to insert your fingers.

[0129] Figure 15B is a cross-sectional view taken along the cross-sectional position DD shown in Figure 10. It is a cross-sectional view of the upper overlapping plate 34 of the resealable paper container 93 of this embodiment, from which the upper seal portion 53 has been removed.

[0130] The front-side opening grip portion 57b, located above the front-side zipper tape 61b, is provided with a front-side concave horizontal ruled line 551b, and the back-side opening grip portion 57a, located above the back-side zipper tape 61a, is provided with a back-side concave horizontal ruled line 551a. Due to the front-side concave horizontal ruled line 551b, the front side 57b above the front-side concave horizontal ruled line 551b is tilted toward the front side. Also, due to the back-side concave horizontal ruled line 551a, the back side 57a above the back-side concave horizontal ruled line 551a is tilted toward the back side.

[0131] Therefore, an opening gap 58 is formed between the cut portion of the front side easy-open processing line 51b and the back side easy-open processing line 51a. The opening trigger gap 58 shown in Figure 15B is the same as the opening trigger gap 58 shown in Figure 15C, and since a finger can be easily inserted into the opening trigger gap 58, it becomes easier to release the zipper tape 61.

[0132] The opening trigger gap 58 formed by either the front-side concave horizontal ruled line 551b or the back-side concave horizontal ruled line 551a also facilitates the release of the zipper tape 61. However, if the front-side concave horizontal ruled line 551b and the back-side concave horizontal ruled line 551a are positioned opposite each other, a larger opening trigger gap 58 is formed, making the zipper tape 61 even more likely to release.

[0133] Convex horizontal lines 554 that are convex when viewed from the outside may be used instead of concave horizontal lines 551. When convex horizontal lines 554 are provided on opening grip margin 57, opening grip margin 57 is deformed from a flat shape, thereby generating opening trigger gap 58 between front side opening grip margin 57b and back side opening grip margin 57a.

[0134] The opening start portion 55 is not limited to the concave horizontal ruled line 551, but may be a convex ruled line or a rectangular embossment as described below. Furthermore, any means for generating the opening start gap 58 between the front side opening grip margin 57b and the back side opening grip margin 57a ​​may be used, for example, by adhering a spacer or applying hot melt. Furthermore, the shape of the front opening tab 55b of the front blank plate 10b and the shape of the back opening tab 55a of the back blank plate 10a may be different.

[0135] <Second aspect of the first embodiment> 13B shows a resealable paper container (flat state) 91 in an intermediate stage of this embodiment, with the blank plate 10 of this embodiment prepared in the previous process. The blank plate 10 of this embodiment is provided with an opening tab 55. The opening tab 55 consists of two recessed horizontal lines 551 that cross between the left and right side edge portions 11, and is located above the zipper tape 61. A resealable paper container 90 is then produced from this blank plate 10.

[0136] The shape of the blank plate 10 other than the opening tab 55 is the same as that of the first embodiment of this mode (see FIGS. 4A, 4B, and 5). The shapes of the front blank plate 10b and the back blank plate 10a are also similar, being line symmetrical. The layer structure of the laminated sheet 78 of the blank plate 10, the method for producing the resealable paper container 90, the method for filling the resealable paper container 90, etc. are the same as those in the first aspect of this embodiment.

[0137] The blank plates 10 of this embodiment are assembled to produce a paper container 90 with a zipper. The easy-open process line 51 is cut, and the upper seal portion 53 is removed. Figure 15C shows a cross section of the easy-open process line 51 of the resealable paper container 93 from which the upper seal portion 53 formed by this procedure has been removed.

[0138] An opening gap 58 is generated between the front side opening grip margin 57b and the back side opening grip margin 57a. This is because the presence of the concave horizontal line 551 causes each of the opening grip margins 57 above the concave horizontal line 551 to deform outward (away from each other). Furthermore, since the fingers can be easily inserted into the opening trigger gap 58, the zipper tape 61 can be easily released.

[0139] The opening trigger gap 58 formed by either the front-side concave horizontal ruled line 551b or the back-side concave horizontal ruled line 551a also facilitates the release of the zipper tape 61. However, if the front-side concave horizontal ruled line 551b and the back-side concave horizontal ruled line 551a are positioned opposite each other, a larger opening trigger gap 58 is formed, making the zipper tape 61 even more likely to release.

[0140] Convex horizontal lines 554 that are convex when viewed from the outside may be used instead of concave horizontal lines 551. When convex horizontal lines 554 are provided on opening grip margin 57, opening grip margin 57 is deformed from a flat shape, thereby generating opening trigger gap 58 between front side opening grip margin 57b and back side opening grip margin 57a.

[0141] The opening catch 55 may be of various types as described below, or may have other shapes, and the shapes of the opening catch 55 of the front blank plate 10b and the back blank plate 10a may be different.

[0142] <Third aspect of the first embodiment> 13C shows a resealable paper container (flat state) 91 in an intermediate stage of this embodiment, with the blank plate 10 of this embodiment prepared in the previous process. The blank plate 10 of this embodiment is provided with an opening tab 55. The opening tab 55 is located approximately in the center of the lateral width of the resealable paper container 90, and consists of a single short, concave horizontal ruled line 551, located above the zipper tape 61.

[0143] The length of the horizontal lines 551 is preferably 10 mm or more so that the fingers of a hand can easily fit over it, and may be about half the horizontal width of the body 72 of the resealable paper container 90, or may be 50 mm or less. Therefore, the length of the horizontal lines 551 is not longer than necessary, and therefore the force required to process the horizontal lines 551 is not large.

[0144] The shape is the same as that of the first embodiment (see FIGS. 4A, 4B, and 5) except for the opening catch 55. The shapes of the front blank sheet 10b and the back blank sheet 10a are also similar as they are line symmetrical. The layer structure of the laminated sheet 78 of the blank plate 10, the method for producing the resealable paper container 90, the method for filling the resealable paper container 90, etc. are the same as those in the first aspect of this embodiment.

[0145] The blank plates 10 of this embodiment are assembled to produce a resealable paper container 90. After that, the easy-open process line 51 is cut and the top seal portion 53 is removed. Figure 15D shows a cut surface of the easy-open process line 51 of the resealable paper container 93 formed by this procedure and from which the top seal portion 53 has been removed.

[0146] An opening gap 58 is generated between the front side opening grip margin 57b and the back side opening grip margin 57a. This is because the presence of the concave horizontal line 551 causes each of the opening grip margins 57 above the concave horizontal line 551 to deform outward (away from each other). Furthermore, since the fingers can be easily inserted into the opening trigger gap 58, the zipper tape 61 can be easily released.

[0147] The opening trigger gap 58 formed by either the front-side concave horizontal ruled line 551b or the back-side concave horizontal ruled line 551a also facilitates the release of the zipper tape 61. However, if the front-side concave horizontal ruled line 551b and the back-side concave horizontal ruled line 551a are positioned opposite each other, a larger opening trigger gap 58 is formed, making the zipper tape 61 even more likely to release.

[0148] Convex horizontal lines 554 that are convex when viewed from the outside may be used instead of concave horizontal lines 551. When convex horizontal lines 554 are provided on opening grip margin 57, opening grip margin 57 is deformed from a flat shape, thereby generating opening trigger gap 58 between front side opening grip margin 57b and back side opening grip margin 57a.

[0149] <First aspect of the second embodiment> 14A shows a resealable paper container (flat state) 91 in an intermediate stage of this embodiment, with the blank plate 10 of this embodiment prepared in the previous process. The blank plate 10 of this embodiment is provided with an opening notch 55, which is located approximately in the center of the width of the resealable paper container 90 in the horizontal direction and consists of two short, concave vertical lines 552.

[0150] The recessed vertical crease 552 is located on the upper side of the zipper tape 61 and extends to the easy-open processing line 51. The recessed vertical crease 552 does not have to reach the easy-open processing line 51, or may extend beyond the easy-open processing line 51. The distance between the two vertical recessed lines 552 is 20 mm. The distance between the two vertical recessed lines 552 may be 10 mm or more, or may be 50 mm or less. Alternatively, the concave vertical crease 552 may be located inside a position 10 mm inward from the second vertical fold line 13. In this way, the folding along the second vertical fold line 13 is not hindered.

[0151] The shape is the same as that of the first mode of the first embodiment (see FIGS. 4A, 4B, and 5) except for the opening catch 55. The shapes of the front blank sheet 10b and the back blank sheet 10a are also similar as they are line symmetrical.

[0152] The layer structure of the laminated sheet 78 of the blank plate 10, the method for producing the resealable paper container 90, the method for filling the resealable paper container 90, etc. are the same as those in the first aspect of the first embodiment. The blank plates 10 of this embodiment are assembled to produce a resealable paper container 90. Then, the easy-open process line 51 is cut and the top seal portion 53 is removed. Figure 16A shows a cross section of the easy-open process line 51 of the resealable paper container 93 formed by this procedure and from which the top seal portion 53 has been removed.

[0153] An opening gap 58 is generated between the front opening grip margin 57b and the back opening grip margin 57a. This is because the presence of the concave vertical lines 552 causes each of the opening grip margins 57 to deform outward (away from each other). Furthermore, since the fingers can be easily inserted into the opening trigger gap 58, the zipper tape 61 can be easily released.

[0154] The opening trigger gap 58 formed by either the front-side concave vertical crease 552b or the back-side concave vertical crease 552a also facilitates the release of the zipper tape 61. However, if the front-side concave vertical crease 552b and the back-side concave vertical crease 552a are positioned opposite each other, a larger opening trigger gap 58 is formed, making the zipper tape 61 even more likely to release.

[0155] <Second aspect of second embodiment> 14B shows a resealable paper container (flat state) 91 in an intermediate stage of this embodiment, with the blank plate 10 of this embodiment prepared in the previous process. The blank plate 10 of this embodiment is provided with an opening notch 55, which is located approximately in the center of the width of the resealable paper container 90 in the horizontal direction and consists of five short, concave vertical lines 552.

[0156] The recessed vertical crease 552 is located on the upper side of the zipper tape 61 and extends beyond the easy-open processing line 51. The recessed vertical crease 552 does not have to reach the easy-open processing line 51, or it may reach the easy-open processing line 51. The five recessed vertical lines 552 are spaced equally apart within a horizontal width (the distance between the outermost recessed vertical lines 552 on the left and right) of 20 mm. In this embodiment, the intervals are 5 mm. The horizontal width may be 10 mm or more, or 50 mm or less. Alternatively, the concave vertical crease 552 may be located inside a position 10 mm inward from the second vertical fold line 13. In this way, the folding along the second vertical fold line 13 is not hindered.

[0157] The shape is the same as that of the first mode of the first embodiment (see FIGS. 4A, 4B, and 5) except for the opening catch 55. The shapes of the front blank sheet 10b and the back blank sheet 10a are also similar as they are line symmetrical.

[0158] The layer structure of the laminated sheet 78 of the blank plate 10, the method for producing the resealable paper container 90, the method for filling the resealable paper container 90, etc. are the same as those in the first aspect of the first embodiment. The blank plates 10 of this embodiment are assembled to produce a resealable paper container 90. After that, the easy-open process line 51 is cut and the top seal portion 53 is removed. Figure 16B shows a cut surface of the easy-open process line 51 of the resealable paper container 93 formed by this procedure and from which the top seal portion 53 has been removed.

[0159] An opening gap 58 is generated between the front opening grip margin 57b and the back opening grip margin 57a. This is because the presence of the concave vertical lines 552 causes each of the opening grip margins 57 to deform outward (away from each other). Furthermore, since the fingers can be easily inserted into the opening trigger gap 58, the zipper tape 61 can be easily released.

[0160] The opening trigger gap 58 formed by either the front-side concave vertical crease 552b or the back-side concave vertical crease 552a also facilitates the release of the zipper tape 61. However, if the front-side concave vertical crease 552b and the back-side concave vertical crease 552a are positioned opposite each other, a larger opening trigger gap 58 is formed, making the zipper tape 61 even more likely to release.

[0161] <First aspect of the third embodiment> 14C shows a resealable paper container (flat state) 91 in an intermediate stage of this embodiment, with the blank plate 10 of this embodiment prepared in the previous process. The blank plate 10 of this embodiment is provided with an opening catch 55, which is located approximately in the center of the lateral width of the resealable paper container 90 and consists of a concave embossed portion 553. The concave embossed portion 553 is concave when viewed from the outside of the resealable paper container 90 and is rectangular in shape.

[0162] The concave embossed portion 553 is located on the upper side of the zipper tape 61 and is in contact with the easy-open processing line 51. The concave embossed portion 553 may be located in the vicinity of the easy-open processing line 51 without reaching the easy-open processing line 51, or may be located across the easy-open processing line 51. The size of the concave embossed portion 553 in this embodiment is 20 mm in width in the horizontal direction and 3 mm in width in the vertical direction. The vertical width of the concave embossed portion 553 may be 2 mm or more, and the horizontal width may be 10 mm or more. This makes it easier for the fingers to grip the opening grip. Furthermore, the vertical width of the concave embossed portion 553 may be 10 mm or less, and the horizontal width may be 50 mm or less. By setting the dimensions in this manner, the force required to process the concave embossed portion 553 does not need to be large.

[0163] The shape is the same as that of the first mode of the first embodiment (see FIGS. 4A, 4B, and 5) except for the opening catch 55. The shapes of the front blank sheet 10b and the back blank sheet 10a are also similar as they are line symmetrical.

[0164] The layer structure of the laminated sheet 78 of the blank plate 10, the method for producing the resealable paper container 90, the method for filling the resealable paper container 90, etc. are the same as those in the first aspect of the first embodiment. The blank plates 10 of this embodiment are assembled to produce a resealable paper container 90. After that, the easy-open process line 51 is cut and the top seal portion 53 is removed. Figure 16C shows a cut surface of the easy-open process line 51 of the resealable paper container 93 formed by this procedure and from which the top seal portion 53 has been removed.

[0165] An opening start gap 58 is generated between the front side opening grip margin 57b and the back side opening grip margin 57a. This is because the presence of the concave embossed portion 553 causes each of the opening grip margins 57 to deform outward (in the direction away from each other). Furthermore, since the fingers can be easily inserted into the opening trigger gap 58, the zipper tape 61 can be easily released.

[0166] The opening trigger gap 58 formed by either the front-side concave embossed portion 553b or the back-side concave embossed portion 553a also facilitates the release of the zipper tape 61. However, when the front-side concave embossed portion 553b and the back-side concave embossed portion 553a are positioned opposite each other, a larger opening trigger gap 58 is formed, making the zipper tape 61 even easier to release.

[0167] <Second aspect of the third embodiment> 14D shows a resealable paper container (flat state) 91 in an intermediate stage of this embodiment, with the blank plate 10 of this embodiment prepared in the previous process. The blank plate 10 of this embodiment is provided with an opening tab 55, which is located approximately in the center of the width of the resealable paper container 90 in the horizontal direction, and is composed of a concave embossed portion 553 and two concave vertical lines 552.

[0168] The concave embossed portion 553 is located on the upper side of the zipper tape 61 and straddles the easy-open processing line 51. The concave embossed portion 553 may be located in the vicinity of the easy-open processing line 51 without reaching the easy-open processing line 51, or may be in contact with the easy-open processing line 51.

[0169] The size of the concave embossed portion 553 in this embodiment is 10 mm in width in the horizontal direction and 6 mm in width in the vertical direction. In this embodiment, the two vertical recessed lines 552 are provided 5 mm apart on both the left and right sides of the recessed embossed portion 553. The distance between the two vertical recessed lines 552 is 20 mm. The opening tab 55 is a combination of the concave vertical lines 552 and the concave embossed portion 553, which ensures ease of opening and allows for further diversity in design.

[0170] The shape is the same as that of the first mode of the first embodiment (see FIGS. 4A, 4B, and 5) except for the opening catch 55. The shapes of the front blank sheet 10b and the back blank sheet 10a are also similar as they are line symmetrical.

[0171] The layer structure of the laminated sheet 78 of the blank plate 10, the method for producing the resealable paper container 90, the method for filling the resealable paper container 90, etc. are the same as those in the first aspect of the first embodiment. The blank plates 10 of this embodiment are assembled to produce a resealable paper container 90. Then, the easy-open process line 51 is cut and the top seal portion 53 is removed. Figure 16D shows a cut surface of the easy-open process line 51 of the resealable paper container 93 from which the top seal portion 53 formed by this procedure has been removed.

[0172] An opening trigger gap 58 is generated between the front side opening grip portion 57b and the back side opening grip portion 57a. This is because the presence of the concave vertical lines 552 and the concave embossed portion 553 causes each of the opening grip portions 57 to deform outward (in the direction away from each other). Furthermore, since the fingers can be easily inserted into the opening trigger gap 58, the zipper tape 61 can be easily released.

[0173] The zipper tape 61 also becomes easy to separate at the opening trigger gap 58 formed by either the front side concave vertical lines 552b and the front side concave embossed portion 553b provided on the front side blank plate 10b, or the back side concave vertical lines 552a and the back side concave embossed portion 553a provided on the back side blank plate 10a. However, if the front side concave vertical lines 552b and the front side concave embossed portion 553b on the front side blank plate 10b are positioned opposite the back side concave vertical lines 552a and the back side concave embossed portion 553a on the back side blank plate 10a, a larger opening trigger gap 58 is created, making it even easier for the zipper tape 61 to come off.

[0174] <First aspect of the fourth embodiment> In this aspect, the concave vertical lines 552 of the first aspect of the second embodiment are replaced with convex vertical lines 555. That is, the concave vertical lines 552 shown in FIG.

[0175] The shape of the blank plate 10 other than the opening catch 55 is the same as that of the first embodiment (see FIGS. 4A, 4B, and 5). The shapes of the front blank plate 10b and the back blank plate 10a are also similar, being line symmetrical. The layer structure of the laminated sheet 78 of the blank plate 10, the method for producing the resealable paper container 90, the method for filling the resealable paper container 90, etc. are the same as those in the first aspect of the first embodiment.

[0176] The blank plates 10 of this embodiment are assembled to produce a resealable paper container 90. After that, the easy-open process line 51 is cut and the top seal portion 53 is removed. Figure 17A shows a cut surface of the easy-open process line 51 of the resealable paper container 93 formed by this procedure and from which the top seal portion 53 has been removed.

[0177] An opening start gap 58 is formed between the front side opening grip portion 57b and the back side opening grip portion 57a. This opening start gap 58 is formed by a recess on the inside of the convex vertical ruled line 555. Since fingers can be easily inserted into the opening start gap 58, the zipper tape 61 can be easily released.

[0178] The opening trigger gap 58 formed by either the convex vertical crease 555b on the front side or the convex vertical crease 555a on the back side also facilitates the opening of the zipper tape 61. However, if the convex vertical crease 555b on the front side and the convex vertical crease 555a on the back side are positioned opposite each other, a larger opening trigger gap 58 is formed, making the zipper tape 61 even easier to open.

[0179] <Second aspect of the fourth embodiment> In this aspect, the concave vertical lines 552 of the second aspect of the second embodiment are replaced with convex vertical lines 555. That is, the concave vertical lines 552 shown in FIG.

[0180] The shape of the blank plate 10 other than the opening catch 55 is the same as that of the first embodiment (see FIGS. 4A, 4B, and 5). The shapes of the front blank plate 10b and the back blank plate 10a are also similar, being line symmetrical. The layer structure of the laminated sheet 78 of the blank plate 10, the method for producing the resealable paper container 90, the method for filling the resealable paper container 90, etc. are the same as those in the first aspect of the first embodiment.

[0181] The blank plates 10 of this embodiment are assembled to produce a resealable paper container 90. After that, the easy-open process line 51 is cut and the top seal portion 53 is removed. Figure 17B shows a cut surface of the easy-open process line 51 of the resealable paper container 93 formed by this procedure and from which the top seal portion 53 has been removed.

[0182] An opening start gap 58 is formed between the front side opening grip portion 57b and the back side opening grip portion 57a. This opening start gap 58 is formed by a recess on the inside of the convex vertical ruled line 555. Since fingers can be easily inserted into the opening start gap 58, the zipper tape 61 can be easily released.

[0183] The opening trigger gap 58 formed by either the convex vertical crease 555b on the front side or the convex vertical crease 555a on the back side also facilitates the opening of the zipper tape 61. However, if the convex vertical crease 555b on the front side and the convex vertical crease 555a on the back side are positioned opposite each other, a larger opening trigger gap 58 is formed, making the zipper tape 61 even more likely to open.

[0184] <First aspect of the fifth embodiment> In this aspect, the concave embossed portion 553 of the first aspect of the third embodiment is replaced with a convex embossed portion 556. That is, the concave embossed portion 553 shown in FIG.

[0185] The shape of the blank plate 10 other than the opening catch 55 is the same as that of the first embodiment (see FIGS. 4A, 4B, and 5). The shapes of the front blank plate 10b and the back blank plate 10a are also similar, being line symmetrical. The layer structure of the laminated sheet 78 of the blank plate 10, the method for producing the resealable paper container 90, the method for filling the resealable paper container 90, etc. are the same as those in the first aspect of the first embodiment.

[0186] The blank plates 10 of this embodiment are assembled to produce a resealable paper container 90. After that, the easy-open process line 51 is cut and the top seal portion 53 is removed. Figure 17C shows a cut surface of the easy-open process line 51 of the resealable paper container 93 formed by this procedure and from which the top seal portion 53 has been removed.

[0187] An opening start gap 58 is formed between the front side opening grip margin 57b and the back side opening grip margin 57a. This opening start gap 58 is formed by the recess on the inside of the convex embossed portion 556. Since fingers can be easily inserted into the opening start gap 58, the zipper tape 61 can be easily released.

[0188] The opening trigger gap 58 formed by either the front-side convex embossed portion 556b or the back-side convex embossed portion 556a also facilitates the release of the zipper tape 61. However, when the front-side convex embossed portion 556b and the back-side convex embossed portion 556a are positioned opposite each other, a larger opening trigger gap 58 is formed, making the zipper tape 61 even easier to release.

[0189] <Second aspect of the fifth embodiment> In this aspect, the concave vertical lines 552 of the second aspect of the third embodiment are replaced with convex vertical lines 555, and the concave embossed portions 553 are replaced with convex embossed portions 556. That is, the concave vertical lines 552 shown in FIG. 14B are replaced with convex vertical lines 555, and the concave embossed portions 553 are replaced with convex embossed portions 556.

[0190] The shape of the blank plate 10 other than the opening catch 55 is the same as that of the first embodiment (see FIGS. 4A, 4B, and 5). The shapes of the front blank plate 10b and the back blank plate 10a are also similar, being line symmetrical. The layer structure of the laminated sheet 78 of the blank plate 10, the method for producing the resealable paper container 90, the method for filling the resealable paper container 90, etc. are the same as those in the first aspect of the first embodiment.

[0191] The blank plates 10 of this embodiment are assembled to produce a resealable paper container 90. After that, the easy-open process line 51 is cut and the top seal portion 53 is removed. Figure 17D shows a cut surface of the easy-open process line 51 of the resealable paper container 93 formed by this procedure and from which the top seal portion 53 has been removed.

[0192] An opening start gap 58 is formed between the front side opening grip portion 57b and the back side opening grip portion 57a. This opening start gap 58 is formed by the concave portion on the inside of the convex vertical ruled line 555 and the convex embossed portion 556. Since fingers can be easily inserted into the opening start gap 58, the zipper tape 61 can be easily released.

[0193] The zipper tape 61 also becomes easier to unzip at the opening trigger gap 58 formed by either the front side convex vertical lines 555b and the front side convex embossed portion 556b provided on the front side blank plate 10b, or the back side convex vertical lines 555a and the back side convex embossed portion 556a provided on the back side blank plate 10a.

[0194] However, if the front side convex vertical lines 555b and the front side convex embossed portions 556b on the front side blank plate 10b are positioned opposite the back side convex vertical lines 555a and the back side convex embossed portions 556a on the back side blank plate 10a, a larger opening trigger gap 58 is created, making it even easier for the zipper tape 61 to come apart. [Example]

[0195] The embodiments of the present disclosure will be described in more detail below with reference to examples.

[0196] Example 1 In Example 1, a paper container 90 with a zipper shown in FIG. 7 was produced using the blank plate 10 shown in FIGS. 4A and 4B corresponding to the first embodiment.

[0197] Two blank plates 10 shown in Figures 4A and 4B were prepared, and the inner surfaces of the blank plates 10 were aligned and overlapped, and the side edge seal portions 36 of the opposing sides were heat-sealed, and the top seal portion 53 was also heat-sealed, as shown in Figure 5. The zipper tape 61 was also heat-sealed. In this way, a resealable paper container (flat state) 91 in the intermediate stage was produced, with the bottom seal portion 37 unsealed.

[0198] The laminated sheet 78 of the blank plate 10 has the following structure: Fig. 12D shows a cross section of the laminated sheet 78, but does not show the printed layer such as a pattern. The laminated sheet 78 of the blank plate 10 had the following structure. (Outer side) Printed layer (gravure printing on the outer surface of the paper base layer 782) / Paper base layer 782 (base paper for liquid paper containers 150g / m 2 Nippon Paper Industries) / Intermediate adhesive layer 784 (EMAA 20μm Mitsui Dow Polychemicals N0908N) / Barrier layer 785 (silica vapor-deposited PET 12 μm Dai Nippon Printing IB-PET-UBP) / The innermost thermoplastic resin layer is 783 (LDPE 40 μm Japanese polyethylene LC520) (Inside)

[0199] A method for manufacturing the laminated sheet 78 will now be described. First, a roll of paper substrate layer 782 was unwound, and predetermined patterns and characters were gravure printed at predetermined positions, and then the paper substrate layer 782 was wound up again into a roll.

[0200] In the next step, the rolled paper substrate layer 782 was unwound, and a barrier layer 785 (silica-deposited PET 12 μm) was laminated on the inner surface of the paper substrate layer 782 by extrusion lamination (sandwich lamination), with a molten intermediate adhesive layer 784 (EMAA 20 μm) interposed therebetween.

[0201] Next, an innermost thermoplastic resin layer 783 (LDPE 40 μm) was formed by extrusion lamination on the opposite side (inner side) of the paper substrate layer 782 of the barrier layer 785, and the product was wound up again into a roll.

[0202] In addition, in order to improve the bonding strength between the bonding layers, anchor coating treatment, corona treatment, flame treatment, etc. may be performed as needed. Alternatively, ozone treatment may be performed on the molten resin.

[0203] Next, the roll-shaped laminated sheet 78 is unwound and subjected to processes such as creasing and punching, thereby completing the blank plate 10.

[0204] The zipper tape 61 that is heat-sealed and attached to the inner surface of the upper overlapping plate 34 and the side plate 41 of the top part 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. The zipper tape 61 has a resin layer made of LLDPE on the side that is heat-sealed to the zippered paper container 90, and a resin layer on the opposite side made of MDPE. The male zipper tape fitting portion 63m and the female zipper tape fitting portion 63f are both made of LLDPE, and the width of the zipper tape body portion 62 is 7 mm.

[0205] The dimensions of the back blank plate 10a and the front blank plate 10b are rectangular, 220 mm in length and 169 mm in width, and a 7 mm wide side edge seal margin 36 is provided on the side edges 11 on both sides as a seal margin at the peripheral edge. In addition, 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 sealing margin for an upper sealing portion 53 having a width of 3 mm was provided near the upper edge 21 of the upper overlapping plate 34 and the side plate 41 of the top portion.

[0206] The blank plate 10 is provided with 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 in this order from the upper edge 21 downward.

[0207] Furthermore, on both outer sides of the upper overlapping plate 34, side plates 41 of the top portion are provided via the second vertical folding line 13. Furthermore, a top-side protruding portion margin 38 is provided on the outer side of both sides of the top panel 33 via the second vertical folding line 13. In addition, side panels 32 are provided on both sides of the wall panel 31 via second vertical folding lines 13. Furthermore, bottom side protrusion margins 43 are provided on the outer sides of both sides of the bottom plate 35 via the second vertical folding lines 13.

[0208] Then, on the upper overlapping plate 34 and the top side plate 41, an easy-open processing line 51 was provided as container opening means, as shown in Figure 5, at a position 10 mm below the upper edge 21 that becomes the upper edge when the inner surfaces of the two blank plates 10 are aligned and overlapped, in the transverse direction of the top 71 of the resealable paper container 90, together with printing on the paper base layer 782 of the laminated sheet 78. The easy-open processing line 51 was provided as an intermittent half-cut line.

[0209] In addition, below the easy-open processing line 51, a zipper tape 61 is heat-sealed to the inner surface of the upper overlapping plate 34 and the side plate 41 of the top part with a gap of 5 mm in a direction crossing the top part 71 of the zippered paper container 90.

[0210] Furthermore, one recessed horizontal ruled line 551 was provided above the zipper tape 61, parallel to the zipper tape 61, so as to cross the blank plate 10. The recessed horizontal ruled line 551 was recessed when viewed from the outside of the resealable paper container 90. The distance between the zipper tape 61 and the recessed horizontal ruled line 551 was 2 mm. The reference position for the distance between the recessed horizontal ruled line 551 was the center of the line in the cross direction, and the same applies to the other ruled lines.

[0211] Furthermore, after joining the two blank plates 10 and heat-sealing the zipper tape 61, the side edge seal portion 36, and the top seal portion 53 using the method described above, a notch 77 was created on the right side edge portion 11 of the overlapping easy-open processing line 51, and an intermediate stage zippered paper container (flat state) 91 was produced in which the bottom seal portion 37 was left unsealed.

[0212] Next, a mandrel was inserted into this intermediate stage zippered paper container (flat state) 91 through the opening of the unsealed bottom seal 37, leaving the upper overlapping plate 34, and the top plate 33 below it was spread out front and back along the first horizontal fold line 22, and the upper overlapping plate 34 was then raised upward. Below the upper overlapping plate 34, there is a top portion 71 made of the top plate 33, followed by a body portion 72 having a substantially rectangular horizontal cross section (a plane substantially parallel to the bottom surface), and a bottom portion 73 having a substantially rectangular opening, forming an intermediate stage resealable paper container (standing state) 92 (see Figure 6).

[0213] Then, the overlapped upper overlapping plate 34 was bent toward the rear top panel 33a. After that, the top protrusions 74 connected to both the left and right sides of the top part 71 were joined to the body part 72. Hot melt adhesive was used for the joining. In addition, the tip of the top protrusion 74 is bent toward the inside of the zippered paper container 90 (downward before the top protrusion 74 is bent) to make it easier to join the top protrusion 74 and the body 72.

[0214] When joining the top-side protrusion 74 to the body 72, the angle formed between the top 71 and the top-side protrusion 74 via the bent portion 76 of the top-side protrusion 74 is set to be approximately a right angle.

[0215] The dimensions of the completed paper container, which was approximately rectangular parallelepiped, were 95 mm in width, 120 mm in height, and 60 mm in depth. In the manner described above, the resealable paper container 90 of this example was produced.

[0216] <Example 2> In this example, a resealable paper container 90 was produced using a blank plate 10 corresponding to the first aspect of the first embodiment, in which the concave horizontal creases 551 shown in Fig. 13A (same as Figs. 4A and 4B) were changed to convex horizontal creases 554. Similar convex horizontal creases 554 were provided on the front blank plate 10b and the back blank plate 10a. Other aspects such as the layer structure of the laminated sheet 78 of the blank plate 10 and the method of producing the resealable paper container 90 were the same as in Example 1.

[0217] Example 3 In this example, a resealable paper container 90 was produced using a blank plate 10 having horizontal recessed lines 551 as shown in Fig. 13B, which corresponds to the second aspect of the first embodiment. Similar horizontal recessed lines 551 were provided on the front blank plate 10b and the back blank plate 10a. Other aspects such as the layer structure of the laminated sheet 78 of the blank plate 10 and the method of producing the resealable paper container 90 were the same as in Example 1.

[0218] Example 4 In this example, a resealable paper container 90 was produced using a blank plate 10 corresponding to the second aspect of the first embodiment, in which the concave horizontal creases 551 shown in Fig. 13B were changed to convex horizontal creases 554. Similar convex horizontal creases 554 were provided on the front blank plate 10b and the back blank plate 10a. Other aspects such as the layer structure of the laminated sheet 78 of the blank plate 10 and the method of producing the resealable paper container 90 were the same as in Example 1.

[0219] <Example 5> In this example, a resealable paper container 90 was produced using a blank plate 10 having horizontal recessed lines 551 as shown in Fig. 13C, which corresponds to the third aspect of the first embodiment. Similar horizontal recessed lines 551 were provided on the front blank plate 10b and the back blank plate 10a. Other aspects such as the layer structure of the laminated sheet 78 of the blank plate 10 and the method of producing the resealable paper container 90 were the same as in Example 1.

[0220] Example 6 In this example, a resealable paper container 90 was produced using a blank plate 10 corresponding to the third aspect of the first embodiment, in which the concave horizontal creases 551 shown in Fig. 13C were changed to convex horizontal creases 554. Similar convex horizontal creases 554 were provided on the front blank plate 10b and the back blank plate 10a. Other aspects such as the layer structure of the laminated sheet 78 of the blank plate 10 and the method of producing the resealable paper container 90 were the same as in Example 1.

[0221] Example 7 In this example, a resealable paper container 90 was produced using a blank plate 10 having vertical recessed creases 552 as shown in Fig. 14A, which corresponds to the first aspect of the second embodiment. Similar vertical recessed creases 552 were provided on the front blank plate 10b and the back blank plate 10a. Other aspects such as the layer structure of the laminated sheet 78 of the blank plate 10 and the method of producing the resealable paper container 90 were the same as in Example 1.

[0222] Example 8 In this example, a resealable paper container 90 was produced using a blank plate 10 corresponding to the first aspect of the fourth embodiment, in which the concave vertical creases 552 shown in Fig. 14A were changed to convex vertical creases 555. Similar convex vertical creases 555 were provided on the front blank plate 10b and the back blank plate 10a. Other aspects such as the layer structure of the laminated sheet 78 of the blank plate 10 and the method of producing the resealable paper container 90 were the same as in Example 1.

[0223] Example 9 In this example, a resealable paper container 90 was produced using a blank plate 10 having vertical recessed creases 552 as shown in Fig. 14B, which corresponds to the second aspect of the second embodiment. Similar vertical recessed creases 552 were provided on the front blank plate 10b and the back blank plate 10a. Other aspects such as the layer structure of the laminated sheet 78 of the blank plate 10 and the method of producing the resealable paper container 90 were the same as in Example 1.

[0224] Example 10 In this example, a resealable paper container 90 was produced using a blank plate 10 corresponding to the second aspect of the fourth embodiment, in which the concave vertical creases 552 shown in Fig. 14B were changed to convex vertical creases 555. Similar convex vertical creases 555 were provided on the front blank plate 10b and the back blank plate 10a. Other aspects such as the layer structure of the laminated sheet 78 of the blank plate 10 and the method of producing the resealable paper container 90 were the same as in Example 1.

[0225] Example 11 In this example, a resealable paper container 90 was produced using a blank plate 10 provided with a concave embossed portion 553 shown in Fig. 14C, which corresponds to the first aspect of the third embodiment. Similar concave embossed portions 553 were provided on the front blank plate 10b and the back blank plate 10a. Other aspects such as the layer structure of the laminated sheet 78 of the blank plate 10 and the method of producing the resealable paper container 90 were the same as in Example 1.

[0226] Example 12 In this example, a resealable paper container 90 was produced using a blank plate 10 corresponding to the first aspect of the fifth embodiment, in which the concave embossed portion 553 shown in Fig. 14C was changed to a convex embossed portion 556. Similar convex embossed portions 556 were provided on the front blank plate 10b and the back blank plate 10a. Other aspects such as the layer structure of the laminated sheet 78 of the blank plate 10 and the method of producing the resealable paper container 90 were the same as in Example 1.

[0227] Example 13 In this example, a resealable paper container 90 was produced using a blank plate 10 having a concave embossed portion 553 and a concave vertical crease 552 as shown in Fig. 14D, which corresponds to the second aspect of the third embodiment. Similar concave embossed portions 553 and concave vertical crease 552 were provided on the front blank plate 10b and the back blank plate 10a. Other aspects such as the layer structure of the laminated sheet 78 of the blank plate 10 and the method of producing the resealable paper container 90 were the same as in Example 1.

[0228] Example 14 In this example, a resealable paper container 90 was produced using a blank plate 10 corresponding to the second aspect of the fifth embodiment, in which the concave embossed portions 553 shown in Fig. 14D were changed to convex embossed portions 556 and the concave vertical creases 552 were changed to convex vertical creases 555. Similar convex embossed portions 556 and convex vertical creases 555 were provided on the front blank plate 10b and the back blank plate 10a. Other aspects such as the layer structure of the laminated sheet 78 of the blank plate 10 and the method of producing the resealable paper container 90 were the same as in Example 1.

[0229] <Comparative Example> In the comparative example, a paper container 80 with a zipper shown in FIG. 2 was produced using one blank plate 81 as shown in FIG. The external dimensions of the completed resealable paper container 80 are approximately the same as those of the embodiment.

[0230] Other aspects such as the layer structure of the laminated sheet of the blank plate 81 and the method of producing the resealable paper container 80 were the same as those in Example 1.

[0231] <Evaluation> Fifty samples each of Examples 1 to 12 and the Comparative Example were prepared and filled with snack foods.

[0232] In all samples, the upper seal of the easy-to-open processing line could be easily cut off and opened using the notch provided on the side plate of the top part as an initial opening means and the easy-to-open processing line provided on the upper overlapping plate and the side plate of the top part. Next, the front opening grip between the front easy-open processing line and the front zipper tape, and the back opening grip between the back easy-open processing line and the back zipper tape were each grasped with a person's fingers and spread outward from the zippered paper container.

[0233] At that time, in the resealable paper containers 90 of Examples 1 to 12, an opening trigger gap 58 was formed between the front opening grip portion 57b and the back opening grip portion 57a. Fingers could be easily inserted into the opening trigger gap 58, making it easy to release the zipper tape 61.

[0234] In the comparative example of the resealable paper container 90, there was no gap between the front and back opening grips, or even if there was a gap, it was very small. Therefore, it was not easy to insert fingers between the front and back opening grips. To open the container, people had to insert their fingernails or a flat tool between the front and back opening grips to pry them open, which sometimes required time to release the zipper tape 61.

[0235] Furthermore, the packages of the resealable paper containers 90 of Examples 1 to 12 in which the resealable tape 61 had been released as described above were tested for the suitability for removing the contents and the resealability with the resealable zipper.

[0236] The fastening of the zipper tape 61 was easily released, opening the top of the zippered paper container 90 across almost the entire width, forming the opening for removal 56. The snacks packed inside could be easily removed through the opening for removal 56.

[0237] Furthermore, after removing a portion of the contents, the packages of the resealable paper containers 90 of Examples 1 to 12 were easily resealed by reattaching the zipper tape 61. The remaining contents were then properly stored.

[0238] Furthermore, the resealable paper container 90 of the present disclosure had a paper mass ratio to the total mass of the resealable paper container 90 that fully satisfied the standard for a paper container of 51% by mass or more. [Explanation of symbols]

[0239] 10 Blank Board 10a Back blank board 10b Front blank plate 11 Side edge 12 First vertical fold line 13 Second vertical fold line 14 Second vertical fold imaginary line 15. Folding line of protruding top part 17 Top 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 protrusion 41 Side panel of the top 43 Bottom side protrusion allowance 51 Easy-open processed wire 52 Zipper tape joint 53 Upper seal part 55 Opening tab 551 concave horizontal lines 552 concave vertical lines 553 Concave embossed part 554 raised horizontal lines 555 raised vertical lines 556 Convex embossed part 56 Removal opening 57 Opening grip 58 Opening gap 61 Zipper Tape 63 Zipper tape fitting 71 Top of resealable paper container 72 Body of a resealable paper container 72d Ridge of the body 73 Bottom of resealable paper container 74 Top protrusion 75 Bottom protrusion 76 Bending part of the protruding part on the top side 77 Notch 78 Laminated Sheet 781 Outermost thermoplastic resin layer 782 Paper base layer 783 Innermost thermoplastic resin layer 784 Intermediate adhesive layer 785 Barrier Layer 788 Paper base protective layer 80 Conventional resealable paper container 81 Blank Board 81a Back blank board 81b Front blank board 812 First vertical fold line 813 Second vertical fold line 821 Intermediate horizontal fold line (half fold line) 831 Wall Panel 836 Side edge seal allowance 834 Upper overlapping plate 851 Easy-open processed wire 856 Removal opening 857 Opening grip 861 Zipper tape 90 Paper container with a resealable fastener of the present disclosure 91 Paper container with a zipper in the intermediate stage of the present disclosure (flat state) 92 Paper container with zipper in intermediate stage of the present disclosure (box state) 93 A paper container with a resealable fastener of the present disclosure, the upper seal of which has been removed A. Enlarged view of a paper container with a zipper (in a boxed state) in the intermediate stage B. Cross section of the easy-open processing line of a resealable paper container with the top seal removed Observation direction (indicated by the arrow in the figure) C Cutting position of enlarged cross section of zipper tape joint 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)

Claims

1. A paper container with a zipper in which a blank plate made of a laminated sheet including a paper base layer is assembled, The blank plates include at least a front blank plate and a back blank plate, A top portion 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; Side plates of the top portion connected to both left and right sides of the upper overlapping plate; A top portion protrusion provided on both the left and right sides of the top portion; A body portion provided below the top portion; a bottom portion provided below 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; a zipper tape located below the upper seal portion and extending across the upper overlapping plate and the side plate of the top portion; At least one of the front blank plate or the back blank plate has an opening tab on the upper edge of the zipper tape, The opening hook portion is a ruled line, The opening hook includes a vertical line extending in the vertical direction of the resealable paper container, The vertical creases are formed by crease processing of the blank plate.

2. The opening hook includes two or more vertical lines extending in the vertical direction of the resealable paper container, The resealable paper container according to claim 1, wherein the vertical lines are positioned in the horizontal direction of the resealable paper container.

3. A paper container with a zipper in which a blank plate made of a laminated sheet including a paper base layer is assembled, The blank plates include at least a front blank plate and a back blank plate, A top portion 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; Side plates of the top portion connected to both left and right sides of the upper overlapping plate; A top portion protrusion provided on both the left and right sides of the top portion; A body portion provided below the top portion; a bottom portion provided below 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; a zipper tape located below the upper seal portion and extending across the upper overlapping plate and the side plate of the top portion; At least one of the front blank plate or the back blank plate has an opening tab on the upper edge of the zipper tape, The opening hook portion is a ruled line, The opening hook includes a vertical line extending in the vertical direction of the resealable paper container, A method for manufacturing a paper container with a zipper, wherein the vertical lines are formed by scoring the blank plate.

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