Zippered paper container

Abstract

To provide a zippered paper container 90 that is easy to peel off when a user peels off an easy-open seal portion 53 in order to remove the contents, in the zippered paper container 90 of the disclosure, in which the easy-open seal portion 53 is provided to seal that top portion 71.SOLUTION: The invention relates to a zippered paper container 90, in which a front side blank plate 10b and a back side blank plate 10a are assembled from a laminated sheet 78 including a paper base material layer 782, this zippered paper container includes: an opening gripping margin 57 at the upper edge part 21 of an upper overlapping plate 34 and a top side part plate 41; and an easy-to-open seal portion 53 located on the lower side of the opening gripping margin 57 and traversing the upper overlapping plate 34 and the top side plate 41, wherein a top edge part 21b of the front side blank plate 10b and an upper edge part 21a of the back side blank plate 10a are in different vertical positions.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The present disclosure relates to a resealable paper container, and particularly to a resealable paper container in the field of paper containers that have a three-dimensional shape and are self-supporting, and which has an opening that is easy to open. [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 protects the contents and prevents spillage when the paper container falls over. Furthermore, 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. Fig. 16 shows a blank plate 81 used to manufacture a paper container 80 with a zipper according to the prior art, Fig. 17 shows a perspective view of the paper container 80 with a zipper according to the prior art, and Fig. 18 shows a perspective view of the paper container with the top open.

[0004] Unless otherwise specified, referring to Figure 15, the front wall panel 831b will be considered the front, and the front, back, left, right, top, and bottom sides of the zippered paper container 80 will be indicated.

[0005] Furthermore, the reference numerals used when describing the prior art are in the 80s or 800s to distinguish them from the present disclosure.

[0006] 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 may include both a and b.

[0007] In the resealable paper container 80 described in Patent Document 1, when opening the top portion 871 and removing the contents, the protrusion 874 on the top surface is first removed from the body portion 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 to open the removal opening 856 (see FIG. 18). The contents are then removed through the removal opening 856.

[0008] When opening the zipper tape 861, 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 are grasped with the fingers, respectively, and the retractable paper container 80 is opened from the front to the back. At this time, the front opening grip margin 857b and the back opening grip margin 857a sometimes come into close contact with each other, eliminating a gap. This makes it difficult to insert the fingers, making it difficult to release the zipper tape 861 and opening the retractable paper container 80.

[0009] When manufacturing resealable paper container 80, there is a process of folding middle horizontal folding line 821 of blank plate 81, and there is a risk of accidentally folding nearby easy-open processing line 851 during this process. In addition, easy-open processing line 851 is a weak part of blank plate 81, and if easy-open processing line 851 is accidentally folded in other manufacturing processes as well, it becomes difficult to manufacture resealable paper container 80, and blank plate 81 becomes a defective product and is discarded. [Prior art documents] [Patent documents]

[0010] [Patent Document 1] Japanese Patent Application Laid-Open No. 2005-178833 Summary of the Invention [Problem to be solved by the invention]

[0011] The present disclosure has been made to solve the above problems, and uses an opening means that replaces the easy-open processing line as a means for initial opening in a resealable paper container 90. The objective is to provide a resealable paper container 90 that uses this opening means to reduce failures and loss of blank plates 10 when the resealable paper container 90 is manufactured.

[0012] Furthermore, the present invention provides a paper container 90 with a zipper that is easy to open when a user initially opens the opening means of the paper container 90 with a zipper by hand or fingers. [Means for solving the problem]

[0013] The above problems can be solved by the following embodiments of the present disclosure.

[0014] 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 zipper-equipped paper container 90, and includes an upper overlapping plate 34 where the front blank plate 10b and the back blank plate 10a are overlapped and joined, 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 portion 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; The upper overlapping plate 34 and the upper edge 21 of the top side plate 41 have an opening grip 57, and an easy-to-open seal portion 53 located below the opening grip portion 57 and provided laterally on the upper overlapping plate 34 and the side plate 41 of the top portion, The upper edge 21b of the front blank sheet 10b and the upper edge 21a of the back blank sheet 10a are positioned at different vertical positions.

[0015] In addition, in the resealable paper container 90 of the present disclosure, The upper edge 21b of the front blank plate 10b may be located higher than the upper edge 21a of the back blank plate 10a.

[0016] In addition, in the resealable paper container 90 of the present disclosure, The upper edge 21b of the front blank plate 10b may be located lower than the upper edge 21a of the back blank plate 10a.

[0017] In addition, in the resealable paper container 90 of the present disclosure, The front blank plate 10b and the back blank plate 10a may have different vertical lengths and the same horizontal lengths.

[0018] In addition, in the resealable paper container 90 of the present disclosure, In the front blank plate 10b, the vertical length of the front top flap 45b including the front upper overlapping plate 34b and the side plate 41b of the front top, and in the back blank plate 10a, the vertical length of the back top flap 45a including the back upper overlapping plate 34a and the side plate 41a of the back top may be different.

[0019] In addition, in the resealable paper container 90 of the present disclosure, The respective spacing between the front side first vertical folding line 12b and the front side second vertical folding line 13b formed on the front side blank plate 10b may be the same as the respective spacing between the back side first vertical folding line 12a and the back side second vertical folding line 13a formed on the back side blank plate 10a.

[0020] In addition, in the resealable paper container 90 of the present disclosure, A protruding portion 361 may be provided at the top of the side edge seal margin 36 of a blank plate 10 having an upper edge 21 that is positioned lower than the position of the upper edge 21b of the front blank plate 10b and the position of the upper edge 21a of the back blank plate 10a.

[0021] In addition, in the resealable paper container 90 of the present disclosure, A zipper tape 61 may be provided below the easy-open seal portion 53, traversing the upper overlapping plate 34 and the side plate 41 of the top portion. [Effects of the Invention]

[0022] According to the above-described embodiment of the present disclosure, the following resealable paper container can be provided.

[0023] That is, in the resealable paper container 90 of the present disclosure, there is a difference in vertical position (height) between the upper edge 21b of the front blank plate 10b and the back upper edge 21a of the back blank plate 10a. And, because there is a location on the top flap 45 where there is only one blank plate 10, it becomes easy for the user to insert their fingers between the front opening grip margin 57b and the back opening grip margin 57a, making it easy to grasp the front opening grip margin 57b and the back opening grip margin 57a ​​with their fingers.

[0024] When a user grasps the front side opening grip portion 57b and the back side opening grip portion 57a ​​with their fingers and opens the resealable paper container from front to back, the easy-open seal portion 53 peels off. Therefore, a resealable paper container 90 can be provided that is easy to open when the user peels off the easy-open seal portion 53 of the resealable paper container 90 to remove the contents. [Brief explanation of the drawings]

[0025] [Figure 1A] FIG. 2 is a development view of a back blank plate 10a used to manufacture a resealable paper container 90 according to a first aspect of the first embodiment of the present disclosure. [Figure 1B]FIG. 1 is a development view of a front blank plate 10b used to manufacture a resealable paper container 90 according to a first aspect of a first embodiment of the present disclosure. [Figure 2] FIG. 2 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. 1A and 1B. [Figure 3] FIG. 2 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. 1A and 1B. [Figure 4] FIG. 2 is a perspective view of a resealable paper container 90 produced using the blank plate 10 shown in FIGS. 1A and 1B. [Figure 5] FIG. 5 is a side view of the resealable paper container 90 shown in FIG. 4. [Figure 6] FIG. 5 is a plan view of the resealable paper container 90 shown in FIG. 4. [Figure 7] 10 is a perspective view of a resealable paper container 93 with a top-side protrusion 74 raised. FIG. [Figure 8] 10 is a perspective view of a resealable paper container 94 with an open top portion 71. FIG. [Figure 9A] 1 is a cross-sectional view of a laminated sheet 78 of one embodiment of the blank plate 10. FIG. [Figure 9B] 10 is a cross-sectional view of a laminated sheet 78 of another embodiment of the blank plate 10. FIG. [Figure 9C] 10 is a cross-sectional view of a laminated sheet 78 of still another embodiment of the blank plate 10. FIG. [Figure 9D] 10 is a cross-sectional view of a laminated sheet 78 of still another embodiment of the blank plate 10. FIG. [Figure 10A] 2 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. 2). [Figure 10B] 2 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. 2). [Figure 11A] FIG. 10 is a development view of a back blank plate 10a used to manufacture a resealable paper container 90 according to a second embodiment of the present disclosure. [Figure 11B] FIG. 10 is a development view of a front blank plate 10b used in manufacturing a resealable paper container 90 according to a second embodiment of the present disclosure. [Figure 12A] FIG. 10 is a development view of a back blank plate 10a used to manufacture a resealable paper container 90 according to a third embodiment of the present disclosure. [Figure 12B] FIG. 10 is a development view of a front blank plate 10b used to manufacture a resealable paper container 90 according to a third embodiment of the present disclosure. [Figure 13A] FIG. 10 is a development view of a back blank plate 10a used to manufacture a resealable paper container 90 according to a fourth embodiment of the present disclosure. [Figure 13B] FIG. 10 is a development view of a front blank plate 10b used in manufacturing a resealable paper container 90 according to a fourth embodiment of the present disclosure. [Figure 14A] 2 is a partially enlarged view of the resealable paper container 90 of the first embodiment in an intermediate stage (flat state) (enlarged view of part A in FIG. 2). [Figure 14B] FIG. 10 is a partially enlarged view of a resealable paper container 90 according to a second embodiment in an intermediate stage (flat state). [Figure 14C] FIG. 10 is a partially enlarged view of a resealable paper container 90 according to a third embodiment in an intermediate stage (flat state). [Figure 14D] FIG. 10 is a partially enlarged view of a resealable paper container 90 according to a fourth embodiment in an intermediate stage (flat state). [Figure 15] 8 is a cross-sectional view of the upper stacking plate 34 at the cross-sectional position DD shown in FIG. 7 in the resealable paper container 90 of the first embodiment. FIG. [Figure 16] 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 17] FIG. 1 is a perspective view of a resealable paper container 80 of the prior art. [Figure 18] 18 is a perspective view of the resealable paper container 80 shown in FIG. 17 with the top part 871 open. DETAILED DESCRIPTION OF THE INVENTION

[0026] 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.

[0027] 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.

[0028] 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.

[0029] 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 having a paper base layer 782 laminated thereon and a thermoplastic resin such as polyethylene laminated as at least the innermost layer, and various folding lines provided within the blank plate 10 define the forming plates for each part required to form the resealable paper container 90.

[0030] First Embodiment <Blank board> The blank plate 10 of the resealable paper container 90 of this embodiment is shown in Figures 1A and 1B. Figure 1A shows the back blank plate 10a, and Figure 1B shows the front blank plate 10b. The back blank plate 10a and the front blank plate 10b may be collectively referred to as the blank plate 10.

[0031] 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 may include both a and b.

[0032] The upper edge 21a of the back side, which is the bottom side of the back side blank plate 10a in FIG. 1A, becomes the top side of the resealable paper container 90.

[0033] The upper edge 21b of the front side of the front side blank plate 10b in FIG. 1B, which is the upper side in the drawing, becomes the upper side of the resealable paper container 90.

[0034] 1A and 1B, the front side of the drawing corresponds to the outer side when the resealable paper container 90 is assembled, and the back side corresponds to the inner side.

[0035] In this embodiment, the front blank plate 10b is larger than the back blank plate 10a.

[0036] Among the elements provided on the blank sheet 10, there are components that function when aligned, such as the folding lines, seals, and zipper tape joints described below, which overlap when the inner surfaces of the front blank sheet 10b and the back blank sheet 10a are aligned and placed one on top of the other.

[0037] 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 2, and then an intermediate stage paper container with a zipper (boxed state) 92 as shown in Figure 3 is produced, and the steps proceed towards completing the paper container with a zipper 90; this manufacturing method will be described later.

[0038] Unless otherwise specified, the top, bottom, left, and right of the front blank plate 10b will be indicated with reference to Figure 1B. 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 1A.

[0039] 4, the upper edge 21 side of the resealable paper container 90 is the upper side, and the lower edge 26 side is the lower side. Furthermore, the front wall panel 31b is the front side, and the front, back, left, right, top, and bottom sides of the resealable paper container 90 are shown. As will be explained later, the formed resealable paper container 90 is composed of, in order from the top, a top portion 71, a body portion 72, and a bottom portion 73, and the top portion may be referred to as the top portion, and the bottom portion may be referred to as the bottom portion (see FIG. 4).

[0040] 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.

[0041] First, the front blank plate 10b will be described. The shape of the back blank plate 10a is almost the same as that of the front blank plate 10b, and the differences between them will be described later.

[0042] The front blank plate 10b and the back blank plate 10a are made of the same material (layer structure) and are manufactured by the same method.

[0043] 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. 1B, 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.

[0044] 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.

[0045] 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.

[0046] 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.

[0047] 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.

[0048] 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.

[0049] 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.

[0050] 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.

[0051] 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.

[0052] 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.

[0053] 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.

[0054] 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.

[0055] 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.

[0056] 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.

[0057] 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.

[0058] 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.

[0059] 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.

[0060] 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.

[0061] 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.

[0062] 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.

[0063] Additionally, 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 top overlapping plate 34b via the second vertical folding line 13b of the front side. These three forming plates are collectively referred to as the top flap 45b of the front side.

[0064] 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.

[0065] 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.

[0066] 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.

[0067] 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.

[0068] The front bottom seal margins 37b are connected to the front bottom plate 35b and the lower sides of the front bottom protruding margins 43b on both the left and right sides thereof.

[0069] 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.

[0070] The vertical length (height) of the back blank plate 10a is smaller than that of the front blank plate 10b. More specifically, the vertical length (height) of the back top flap 45a is smaller than that of the front top flap 45b.

[0071] Of the other forming plates, the front blank plate 10b and the back blank plate 10a have the same shape.

[0072] Therefore, the shape of the blank sheet 10 below the first horizontal folding line 22 is the same, and when the inner surfaces are aligned and positioned, they overlap.

[0073] 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.

[0074] 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.

[0075] 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.

[0076] 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.

[0077] The order of the creasing and punching processes does not matter, and they can be done simultaneously.

[0078] 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.

[0079] 2 is a front view showing the shape of a resealable paper container (flat state) 91 at an intermediate stage when a resealable paper container 90 is manufactured using the blank plate 10 shown in FIGS. 1A and 1B. The top is the upper edge 21b of the front blank plate 10b shown in FIG. 1B, and behind it is provided the back blank plate 10a. The upper edge 21a of the back blank plate 10a is shown by a hidden line (broken line) and is located lower than the upper edge 21b of the front blank plate 10b, and the two are located in different positions when viewed from the front.

[0080] Therefore, in the intermediate stage resealable paper container (flat state) 91 of this embodiment, the area below the upper edge 21a of the back blank plate 10a is made up of two laminated sheets 78, and the area between the upper edge 21a of the back blank plate 10a and the upper edge 21b of the front blank plate 10b is made up of one laminated sheet 78.

[0081] Here, the portion of the seal margin 36b on the front side edge adjacent to the side plate 41b of the front top portion is also included in the front top flap 45b.

[0082] The portion of the seal margin 36a on the rear side edge adjacent to the side plate 41a of the rear top portion is also included in the rear top flap 45a.

[0083] The front blank sheet 10b and the back blank sheet 10a overlap below the first horizontal folding line 22 when viewed from the front side. That is, the front blank sheet 10b and the back blank sheet 10a differ in shape above the first horizontal folding line 22. In other words, only the shapes of the front top flap 45b and the back top flap 45a differ.

[0084] 2, the rear blank plate 10a and the front blank plate 10b are almost overlapping, and the positional relationship and quantity of each component are the same. Since the positional relationship is almost the same when viewed from the perspective of the drawing, the notation "front side" and suffixes may be omitted in the explanation.

[0085] An enlarged view of the upper part of the resealable paper container (flat state) 91 at an intermediate stage is shown in Figure 14A. It is an enlarged view of area A shown in Figure 2. When viewed from the front side, the front side upper edge 21b of the front side blank plate 10b is visible and is therefore shown by a solid line, while the back side upper edge 21a of the back side blank plate 10a is not visible and is therefore shown by a hidden line (dashed line).

[0086] On the upper overlapping plate 34 and the side plate 41 on the top front side, at a predetermined position where the two blank plates 10 overlap each other, an easy-open seal portion 53 as a transverse sealing means and a zipper tape joint portion 52 are provided in this order from the upper edge 21. The zipper tape joint portion 52 is the portion of the blank plate 10 where the zipper tape 61 is joined.

[0087] The front upper edge 21b and the back upper edge 21a will be described with reference to Figure 2. When a user initially opens the top 71 of the resealable paper container 90 containing the contents, the user peels off the easy-open seal 53 on the top 71 to expose the zipper tape 61. At that time, the user grips the front opening grip margin 57b and the back opening grip margin 57a ​​with their fingers and opens the resealable paper container in the front-to-rear direction, whereby the easy-open seal 53 is peeled off.

[0088] In this case, in the conventional paper container 80 with a zipper, the front opening grip 857b and the back opening grip 857a are in close contact with each other, and there is either no gap between them or, if there is a gap, it is very small, making it difficult for the user to insert their fingers.

[0089] In this embodiment, the front-side upper edge 21b is higher than the back-side upper edge 21a, so when viewed from the front side, only one laminated sheet 78 of the front blank sheet 10b is present between the front-side upper edge 21b and the back-side upper edge 21a. Therefore, by grasping the front blank sheet 10b, which is the portion with only one laminated sheet 78, with one's fingers and folding it over, a gap is created between the front-side opening grip margin 57b of the front blank sheet 10b and the back-side opening grip margin 57a ​​of the back blank sheet 10a, making it easier to grasp the back blank sheet 10a with one's fingers. When the front blank sheet 10b and the back blank sheet 10a are spread apart, the easy-open seal portion 53 can be easily peeled off.

[0090] The easy-open seal portion 53, which serves as a transverse sealing means, is formed by joining the opposing front and back easy-open seal portions 53b and 53a. The joining is performed across the entire width of the resealable paper container 90, so the resealable paper container 90 remains airtight. If the easy-open seal portion 53 is approximately perpendicular to the side edge portion 11, the length of the easy-open seal portion 53 can be shortened.

[0091] Furthermore, it is desirable that the zipper tape 61 be approximately perpendicular to the side edge portion 11.

[0092] 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.

[0093] The front side upper edge 21b and the back side upper edge 21a do not necessarily need to be parallel, but it is advisable to provide an area where there is only one laminated sheet 78 of the front side blank plate 10b.

[0094] <Easy-to-open seal> The easy-open seal portion 53 will be described with reference to Figure 2. The easy-open seal portion 53 serves to seal the top portion 71 of the resealable paper container 90. Furthermore, when opening the top portion 71 of the resealable paper container 90 to remove the contents, it can be easily peeled off to form the removal opening 56. Therefore, the user can open the resealable paper container 90 with their fingers without using a tool such as scissors.

[0095] In order for the easy-open seal portion 53 to be easily opened by the user's fingers, the easy-open seal portion 53 must be sealed with an appropriate peel strength (upper limit). Furthermore, in order to ensure appropriate sealing of the contents, it is desirable for the easy-open seal portion 53 to have an appropriate peel strength (lower limit). The peel strength is preferably 1 N / 15 mm or more and 20 N / 15 mm or less. More preferably, it is 5 N / 15 mm or more and 15 N / 15 mm or less.

[0096] In order to set the appropriate peel strength, an easy peel processed portion 54 is provided at the interface where the easy open seal portion 53 is joined, i.e., on the inner surface of the blank plate 10. The easy peel processed portion 54 sets the peel strength of the easy open seal portion 53 appropriately.

[0097] The easily peelable processed portion 54 for obtaining the easily openable seal portion 53 having the appropriate peel strength as described above is formed by applying a coating liquid of an easy-peel thermal adhesive resin or a resin called an anti-heat sealant in a pattern by means of gravure printing or flexographic printing, and then drying it.

[0098] When the easily peelable processed portion 54 is formed of an easy-peel thermal adhesive resin, the easy-peel thermal adhesive resin may be, for example, a resin composition in which a polyolefin resin such as low-density polyethylene or ethylene-vinyl acetate copolymer is appropriately mixed with additives such as polystyrene, chlorinated polypropylene, polybutene-1, inorganic or organic fillers, polyethylene wax, or fatty acid amide.

[0099] As the inorganic or organic filler, powders of silica, calcium carbonate, talc, kaolin, clay, titanium oxide, alumina, aluminum hydroxide, etc. can be used as inorganic fillers, with silica powder being particularly preferred, and powders of melamine resin, urea resin, alkyd resin, epoxy resin, acrylic resin, polystyrene, ethylene fluoride resin, silicone resin, etc. can be used as organic fillers.

[0100] The content of the above additives in the above resin composition is preferably 4% by mass or more and 40% by mass or less. If the content of the additives is less than 4% by mass, the peel strength will be too strong and a good easy-to-open seal portion 53 (easy peelability) will not be obtained. On the other hand, if the content of the additives exceeds 40% by mass, the peel strength will be too weak, which is not preferable.

[0101] The amount of the easy-peel thermal adhesive resin applied when dry is 2 g / m. 2 More than 8g / m 2 Less than 3g / m is preferred 2 More than 5g / m 2 The following is even more preferred:

[0102] When the easily peelable portion 54 is formed with a heat-sealing agent, a resin composition in which a base resin is mixed with an appropriate amount of a release agent can be used as the heat-sealing agent.

[0103] Examples of the base resin that can be used include ethyl cellulose, cyclized rubber, and acrylic resin, and examples of the release agent that can be used include silicone resin, polyethylene wax, soybean lecithin, and higher fatty acid amide. When applying an anti-heat-sealing agent, the amount of application can be small, and a thickness of 0.3 μm or more and 2 μm or less is appropriate.

[0104] Since the easily peelable portion 54 weakens the bonding strength between the inner surfaces of the blank sheets 10, it is desirable not to provide it in locations where strong bonding is desired. In this embodiment, as shown in Fig. 14A, it is desirable that the easily peelable portion 54 does not extend over the area of ​​the sealing portion 36 on the side edge portion. In consideration of manufacturing variations, the sealing portion 36 on the side edge portion and the easily peelable portion 54 may be spaced apart. The distance between them may be 0.5 mm or more and 15 mm or less.

[0105] If the distance is less than 0.5 mm, there is a risk that the seal margin 36b on the side edge and the easily peelable portion 54 may overlap due to variations in manufacturing.

[0106] If the gap exceeds 15 mm, the opening when the top part 71 of the resealable paper container 90 is fully opened becomes small, which may make it difficult to remove the contents.

[0107] Furthermore, the vertical length (height) of the easy peel portion 54 may be greater than the vertical length (height) of the easy-open seal portion 53 by 0.5 mm or more and 5 mm or less. This is because even if the easy peel portion 54 and / or the easy-open seal portion 53 deviate from their predetermined positions due to manufacturing errors, the easy-open seal portion 53 will not deviate from the area of ​​the easy peel portion 54. Therefore, the width of the easy-open seal portion 53 is maintained at a predetermined width, thereby stabilizing the peel strength. Note that if the size is less than 0.5 mm, there is a risk that the easy-open seal portion 53 will deviate from the area of ​​the easy peel portion 54. Furthermore, if the size exceeds 5 mm, there is a risk that the easy peel portion 54 and the zipper tape joint portion 52 will interfere with each other, hindering the joining of the zipper tape 61 and the blank plate 10, which will be described later.

[0108] In this embodiment, the easy peel processed portion 54 is provided as described above so that the peel strength of the easy-open seal portion 53 can be appropriately set. However, if the peel strength can be appropriately set by another method, the easy peel processed portion 54 does not necessarily have to be provided. As an example of another method, the heat sealing conditions (temperature, time, pressure, etc.) of the easy-open seal portion 53 may be appropriately set. Alternatively, the easy-open seal portion 53 may be formed in a dotted or striped shape, etc., to set the peel strength while reducing the effective heat-sealed area.

[0109] <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.

[0110] <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.

[0111] 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.

[0112] 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 easy-open seal portions 53 are heat-sealed together.

[0113] 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. 10A and 10B).

[0114] 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.

[0115] 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.

[0116] <Blank plate laminate sheet> As described above, the laminated sheet 78 used for the blank plate 10 is a laminated sheet 78 in which at least a paper base layer 782 is laminated and at least a thermoplastic resin such as polyethylene is laminated as the innermost thermoplastic resin layer 783. Furthermore, as necessary, a barrier layer 785 against water vapor, oxygen, and other substances, a strength-improving layer, etc. may be provided in the intermediate layer.

[0117] Furthermore, when providing a printed layer of a pattern or the like on the resealable paper container 90 of this embodiment, it is usually printed on the outer side of the paper base layer 782, but if the paper base layer 782 is not well suited for printing, it is also possible to provide a printed layer of a pattern or the like on a synthetic resin film such as a biaxially oriented polyethylene terephthalate film, and laminate that film on one of the outer layers of the paper base layer 782.

[0118] 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.

[0119] 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 g / m 2 More than 320g / m 2The following ranges are appropriate:

[0120] 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.

[0121] 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 μm or more and 10 μm or less. This reduces the proportion of plastic material used and also offers cost benefits.

[0122] 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.

[0123] 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.

[0124] 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).

[0125] 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 9A, 9B, 9C, and 9D.

[0126] FIG. 9A is a cross-sectional view of a laminated sheet 78 of the blank plate 10 made up of three layers, the layer structure of which is as follows, with " / " indicating the boundary between adjacent layers.

[0127] (Outer surface) Outermost thermoplastic resin layer 781 / Paper base layer 782 / Innermost thermoplastic resin layer 783 (inner surface) FIG. 9B 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.

[0128] (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. 9A.

[0129] 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. 9C 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.

[0130] (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) FIG. 9D 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:

[0131] (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. 9C.

[0132] 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.

[0133] <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.

[0134] <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.

[0135] Next, the inner surfaces of the easy-open seal portions 53 are heat-sealed, and the inner surfaces of the seal margins 36 on the side edges adjacent to the side edges 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 an opening at the lower edge 26.

[0136] 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.

[0137] In this device, a long printed laminated sheet 78 wound up in a roll can be unwound, and with the paper containers connected horizontally, processes such as processing the folding lines, inserting and heat sealing the zipper tape 61, heat sealing the side edge seal margins 36, and heat sealing the easy-open seal portions 53 can be performed. Note that the order of the steps described above may be different as long as the desired paper container 90 with a zipper can be obtained.

[0138] Here, the shape of the top flap 45 of the resealable paper container 90 of this embodiment will be described with reference to FIG.

[0139] The top flap 45 is provided with, in order from the upper edge 21, an opening grip 57, an easy-to-open seal portion 53, and a zipper tape 61, and below the zipper tape 61 is located a first horizontal folding line 22.

[0140] 10A and 10B 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. 2. Here, the blank sheet 10 is exemplified by the four-layer laminated sheet 78 in Fig. 9D.

[0141] 10A, 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.

[0142] 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.

[0143] 10B, a male zipper tape 61m is joined to the front blank plate 10b as the front zipper tape 61b. The male zipper tape 61m includes a male zipper tape body 62m joined to the blank plate 10b and a male zipper tape fitting portion 63m having a protrusion that fits with the female zipper tape 61f.

[0144] 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.

[0145] 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.

[0146] <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.

[0147] 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.

[0148] 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, forming an intermediate stage resealable paper container (standing state) 92. At this stage, the upper overlapping plate 34 stands upright as shown in Figure 3.

[0149] 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.

[0150] <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.

[0151] At this time, the bent portion 76 of the top-side protrusion 74 is bent. At this time, in order to ensure that the bent portion 76 is bent, an auxiliary member may be brought into contact with the vicinity of (including abutment against) the bent portion 76 from the inner side and / or outer side of the top portion 71.

[0152] The top protrusion 74 may be joined to the body 72 using an adhesive (hot melt, etc.), adhesive tape, or mechanical joining (engaging, using a joining tool). 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. A similar method is used for joining the bottom protrusion, which will be described later.

[0153] The tip of the top-side protrusion 74 may be joined to the body 72 of the resealable paper container 90.

[0154] 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.

[0155] 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.

[0156] 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 protruding bottom side portions 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.

[0157] Fig. 4 is a perspective view showing a resealable paper container 90 of this embodiment. Fig. 5 is a side view of the resealable paper container 90 shown in Fig. 4. Fig. 6 is a plan view of the resealable paper container 90 shown in Fig. 4.

[0158] The resealable paper container 90 shown in FIG. 4 has an outer shape formed into a substantially rectangular parallelepiped, and has a ridge portion 72d on its body portion 72.

[0159] 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.

[0160] <Opening operation for removing contents from a paper container with a zipper> 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.

[0161] 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 the upper overlapping plate 34 also stands up (see Figure 7). The top side plate 41 and the upper overlapping plate 34 are then approximately flush with each other. As previously explained, the top side plate 41 and the top side plate 41 together are called the top flap 45.

[0162] In this embodiment, the upper edge 21a on the back side is hidden by the front blank plate 10b and is therefore not visible from the front side. Therefore, only one element, the upper edge 21b on the front side, of the upper edge 21 of the blank plate 10 is visible, resulting in a simple and beautiful appearance.

[0163] To initially open the paper container 90 with a zipper, the user grasps the opening gripping margins 57 on both the front and back sides with his / her fingers and spreads the front opening gripping margin 57a ​​and the back opening gripping margin 57a ​​in the front-to-back direction to peel off the easy-to-open seal portion 53.

[0164] When the user grasps the front and back opening grip portions 57, a gap must be provided between the front and back opening grip portions 57, and the user must insert his or her fingers therebetween.

[0165] FIG. 15 is an enlarged cross-sectional view of the cross-sectional position DD shown in FIG. 7, showing a paper container with a zipper. 90 and its vicinity.

[0166] In this embodiment, the upper edge 21b of the front blank plate 10b is located higher than the upper edge 21a of the back blank plate 10a. Therefore, only one front blank plate 10b exists between the front upper edge 21b and the back upper edge 21a, and two blank plates, the front blank plate 10b and the back blank plate 10a, exist below the back upper edge 21a.

[0167] The easy-open seal portion 53 is initially opened in the following manner. In the area of ​​the front-side opening grip margin 57b, which is the area above the back-side upper edge 21a, the front-side opening grip margin 57b is a single piece, and its front and back surfaces are exposed, making it easy for the user to grasp with their fingers. When the user grasps this area with their fingers and bends it toward the front (to the left in FIG. 15), a gap is created between the front-side opening grip margin 57b and the back-side opening grip margin 57a. Using this gap, the user can grasp the front and back surfaces of the back-side opening grip margin 57a ​​with their fingers.

[0168] By gripping the opening gripping portions 57 with both hands and spreading them in the front-to-back direction, the easy-to-open seal portion 53 is peeled off, and the initial opening of the resealable paper container 90 is completed.

[0169] Next, after the initial opening of the resealable paper container 90, the zipper tape 61 is opened. Here, the area between the front side upper edge 21b and the front side zipper tape 61b is defined as the front side opening after initial opening gripping margin 571b. Also, the area between the back side upper edge 21a and the back side zipper tape 61b is defined as the back side opening after initial opening gripping margin 571a. The opening after initial opening gripping margin 571 includes the opening gripping margin 57, the easy-open seal portion 53, and the area between the zipper tape 61 and the easy-open seal portion 53.

[0170] The user grasps the initial opening gripping areas 571 on both the front and back sides with their fingers and spreads them in the front-to-back direction of the resealable paper container 90. By doing so, the zipper tapes 61 provided on the upper overlapping plate 34 and the side plates 41 on the top of both the left and right sides are released.

[0171] During this opening operation of the zipper tape 61, the ends of the zipper tape 61 near the left and right side edges 11 of the blank sheet 10 are opened over almost the entire width up to the side edge seal margins 36. The side edge seal margins 36 are not peeled off.

[0172] As described above, the male zipper tape 61m and the female zipper tape 61f of the zipper tape 61 are separated to form the removal opening 56. Fig. 8 shows a paper container 94 with a zipper, the top part 71 of which is open.

[0173] The operation of peeling the easy-open seal portion 53 and the operation of unzipping the zipper tape 61 may be performed in a series of operations. Alternatively, the operation of unzipping the zipper tape 61 may be performed after the operation of peeling the easy-open seal portion 53 is completed.

[0174] Second Embodiment 11A and 11B show the blank plate 10 of this embodiment. In the blank plate 10 of this embodiment, the vertical length (height) of the front blank plate 10b is shorter than the vertical length (height) of the back blank plate 10a. More specifically, the vertical length of the front top flap 45b is shorter than the vertical length of the back top flap 45a.

[0175] Fig. 14B shows a partially enlarged view of a resealable paper container (flat state) 91 at an intermediate stage where the two blank plates 10 are aligned and joined together. The enlarged portion is the same as part A in Fig. 2 of the first embodiment.

[0176] The position (height) of the front side upper edge 21b is lower than the position (height) of the back side upper edge 21a. Therefore, only one back side blank plate 10a exists between the front side upper edge 21b and the back side upper edge 21a, and two blank plates, the front side blank plate 10b and the back side blank plate 10a, exist below the front side upper edge 21a.

[0177] The shape of the blank plate 10 other than the top flap 45 is the same as in the first embodiment. The layer structure of the laminated sheet 78 of the blank plate 10, the method for producing the resealable paper container 90, and the method for filling the resealable paper container 90 are the same as in the first embodiment.

[0178] In this embodiment, both the front side upper edge 21b and the back side upper edge 21a are visible when viewed from the front side, and therefore the part of the back side opening gripping margin 57a ​​to be gripped can be easily recognized.

[0179] The blank plates 10 of this embodiment are assembled to produce a resealable paper container 90. Then, the resealable paper container 90 filled with contents is produced. After that, when the resealable paper container 90 filled with contents is initially opened, it becomes a resealable paper container 93 in a state where the protrusion 74 on the top side is raised.

[0180] The easy-open seal portion 53 is initially opened in the following manner. In the area of ​​the back side opening grip portion 57a ​​above the front side upper edge portion 21b, the back side opening grip portion 57a ​​is a single piece, and its front and back surfaces are exposed, making it easy for the user to grasp with their fingers. When the user grasps this area with their fingers and bends it toward the back side, a gap is created between the front side opening grip portion 57b and the back side opening grip portion 57a. Using this gap, the user can grasp the front and back surfaces of the front side opening grip portion 57b with their fingers.

[0181] By gripping the opening gripping portions 57 on both the front and back sides with both hands and spreading them in the front-to-back direction, the easy-to-open seal portion 53 is peeled off, and the initial opening of the resealable paper container 90 is completed.

[0182] Third Embodiment 12A and 12B show the blank plate 10 of this embodiment. As in the first embodiment, the blank plate 10 of this embodiment has a front blank plate 10b whose vertical length (height) is longer than the back blank plate 10a whose vertical length (height) is longer.

[0183] The difference from the first embodiment is the shape of the rear edge seal margin 36a of the rear blank sheet 10a, more specifically, the shape of the rear protruding end 361a of the rear edge seal margin 36a. The vertical (height) position of the rear protruding end 361a of the rear edge seal margin 36a is the same as the position of the upper edge 21b of the front blank sheet 10b, i.e., the position of the upper edge of the front edge seal margin 36b. Therefore, the rear protruding end 361a of the rear edge seal margin 36a protrudes beyond the rear upper edge 21a, and the horizontal length (width) is the same.

[0184] 14C shows a partially enlarged view of a resealable paper container (flat state) 91 in an intermediate stage in which two blank sheets 10 of this embodiment are aligned and joined. Because the front edge seal portion 36b and the rear edge seal portion 36a have the same shape, stable joining is possible. Furthermore, because the innermost thermoplastic resin layer 783 is not exposed when the front edge seal portion 36b and the rear edge seal portion 36a are joined, the risk of the molten innermost thermoplastic resin layer 783 adhering to unintended locations and causing contamination is reduced.

[0185] The shape of the blank plate 10 other than the shape of the rear end 361a of the rear edge seal portion 36a is the same as in the first embodiment. The layer structure of the laminated sheet 78 of the blank plate 10, the method for producing the resealable paper container 90, and the method for filling the resealable paper container 90 are the same as in the first embodiment. The effect of making it easier to peel the easy-open seal portion 53 when initially opening the resealable paper container 90 is the same as in the first embodiment.

[0186] In this embodiment, the position of the front side upper edge 21b of the front side blank sheet 10b is higher than the position of the back side upper edge 21a of the back side blank sheet 10a. Conversely, as in the second embodiment, the position of the front side upper edge 21b of the front side blank sheet 10b may be lower than the position of the back side upper edge 21a of the back side blank sheet 10a.

[0187] <Fourth embodiment> 13A and 13B show the blank plate 10 of this embodiment. As in the first and third embodiments, the blank plate 10 of this embodiment has a front blank plate 10b whose vertical length (height) is longer than the back blank plate 10a whose vertical length (height) is longer.

[0188] Furthermore, as in the third embodiment, a rear side protrusion 361a is provided that protrudes from the rear side edge seal margin 36a of the rear side blank plate 10a. Furthermore, unlike the third embodiment, a side plate protrusion 411a of the rear side top portion is provided inside the rear side protrusion 361a. The lower side of the side plate protrusion 411a of the rear side top portion is connected to the side plate 41a of the rear side top portion.

[0189] 14D shows a partially enlarged view of a resealable paper container (flat state) 91 in an intermediate stage in which two blank sheets 10 of this embodiment are aligned and joined. Because the front-side edge seal margin 36b and the back-side edge seal margin 36a have the same shape, stable joining is possible. Furthermore, because the innermost thermoplastic resin layer 783 is not exposed when the front-side edge seal margin 36b and the back-side edge seal margin 36a are joined, the risk of the molten innermost thermoplastic resin layer 783 adhering to unintended locations and contaminating the resealable paper container 90 is reduced.

[0190] The upper edge of the rear side protrusion 361a of the rear side edge seal portion 36a and the upper edge of the rear side top side plate protrusion 411a are at the same vertical position (height). In addition, the width of the rear side top side plate protrusion 411a may be 0.5 to 3 times the width of the rear side edge seal portion 36a.

[0191] By making the width 0.5 times or more, when the rear side tip 361a and the rear side top side plate tip 411a are connected together, the width is sufficiently large, so strength is maintained and the risk of the rear side tip 361a being bent and damaged when the zippered paper container 90 is made is reduced.

[0192] By being three times or less, the area of ​​one sheet of the front opening gripping area 57b is sufficiently secured, making it easy for the user to grasp the front opening gripping area 57b when initially opening the resealable paper container 90.

[0193] Furthermore, the upper edge connecting the side plate protruding end 411a of the top portion of the back side to the upper edge 21a of the back side may have a downward inclination as it goes inward.

[0194] The shape of the blank plate 10 is the same as that of the third embodiment, except for the provision of the side plate protrusion 411a of the back top portion. The layer structure of the laminated sheet 78 of the blank plate 10, the method of manufacturing the resealable paper container 90, and the method of filling the resealable paper container 90 are the same as those of the first embodiment. The effect of making it easier to peel the easy-open seal portion 53 when initially opening the resealable paper container 90 is the same as that of the first embodiment.

[0195] In this embodiment, the position of the front side upper edge 21b of the front side blank sheet 10b is higher than the position of the back side upper edge 21a of the back side blank sheet 10a. Conversely, as in the second embodiment, the position of the front side upper edge 21b of the front side blank sheet 10b may be lower than the position of the back side upper edge 21a of the back side blank sheet 10a. [Example]

[0196] The embodiments of the present disclosure will be described in more detail below with reference to examples.

[0197] Example 1 In Example 1, a paper container 90 with a zipper shown in FIG. 4 was produced using the blank plate 10 of FIGS. 1A and 1B corresponding to the first embodiment.

[0198] 1A and 1B 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 as shown in FIG. 2, and the easy-open seal portion 53 was also heat-sealed. 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.

[0199] The laminated sheet 78 of the blank plate 10 had the following configuration. A cross-sectional view of the laminated sheet 78 is shown in Fig. 9D, but the printed layer such as a picture and the easily peelable portion 54 are not shown. Note that " / " indicates the boundary between adjacent layers.

[0200] (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) 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 the layer was then wound up into a roll again.

[0201] 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.

[0202] 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.

[0203] 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.

[0204] Next, the rolled laminated sheet 78 was unwound, and the easily peelable portion 54 was provided by gravure printing at a predetermined position on the inner surface of the innermost thermoplastic resin layer 783, and the laminated sheet was then wound up again into a roll.

[0205] In this embodiment, a pattern or the like is first printed on the single-layer paper base layer 782. However, after the laminated sheet 78 is completed, a pattern or the like may be printed on the front side of the laminated sheet 78.

[0206] Next, the roll-shaped laminated sheet 78 is unwound and subjected to processes such as creasing and punching, thereby completing the blank plate 10.

[0207] 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.

[0208] 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 zipper tape body portions 62 both have a width of 7 mm.

[0209] The dimensions of the front blank plate 10b are rectangular, 250 mm in length and 189 mm in width, and a 7 mm wide front edge seal margin 36b is provided on the front edge margin 11b on both sides as a seal margin at the peripheral edge.

[0210] Also, a 10 mm wide bottom seal margin 37b was provided on the lower edge 26b of the lower front side.

[0211] The dimensions of the back blank plate 10a are rectangular, 245 mm in length and 189 mm in width, and a 7 mm wide back edge seal margin 36a is provided on the back edge 11a on both sides as a seal margin at the peripheral edge.

[0212] In addition, a 10 mm wide bottom seal margin 37a was provided on the bottom edge 26a of the bottom side.

[0213] The front top flap 45b had a vertical length (height) of 40 mm. A front opening grip 57b having a vertical length (height) of 12 mm was provided at the front upper edge 21b of the front top flap 45b, and a front easy-open seal portion 53b having a vertical length (height) of 3 mm was provided below the front opening grip 57b. The front easy-open seal portion 53b was sealed including the front side edge seal portion 36b and the area of ​​the front easy-peel processed portion 54b provided excluding the vicinity of the front side edge seal portion 36b.

[0214] The vertical length (height) of the back side top flap 45a was 35 mm. A back side opening grip 57a having a vertical length (height) of 7 mm was provided at the back side upper edge 21a of the back side top flap 45a, and a front side easy-open seal portion 53b having a vertical length (height) of 3 mm was provided below the back side opening grip 57a. The back side easy-open seal portion 53a was sealed including the back side side edge seal portion 36a and the area of ​​the back side easy-peel processed portion 54a provided excluding the vicinity of the back side side edge seal portion 36a.

[0215] The above-mentioned front side easy-open seal portion 53 and back side easy-open seal portion 53a are in the same location because the front side blank plate 10b and the back side blank plate 10a are joined in position. Therefore, the front side blank plate 10b and the back side blank plate 10a have the same shape below the easy-open seal portion 53 when their inner surfaces are overlapped.

[0216] 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.

[0217] Furthermore, top side panels 41 are provided on the outer sides of both sides of the upper overlapping panel 34 via second vertical bending lines 13. Furthermore, top side protrusion margins 38 are provided on the outer sides of both sides of the top panel 33 via second vertical bending lines 13. Furthermore, side panels 32 are provided on the outer sides of both sides of the wall panel 31 via second vertical bending lines 13. Furthermore, bottom side protrusion margins 43 are provided on the outer sides of both sides of the bottom panel 35 via second vertical bending lines 13.

[0218] Additionally, a zipper tape 61 was heat-sealed to the inner surface of the top flap 45 below the easy-open seal portion 53 in a direction transverse to the top portion 71. Here, the distance between the upper edge 21b of the front side and the center in the vertical direction (width direction) of the zipper tape 61 was 25 mm, and the distance between the upper edge 21a of the back side and the center in the vertical direction (width direction) of the zipper tape 61 was 20 mm. The distance between the zipper tape 61 and the first horizontal fold line 22 was 20 mm (the same on both the front and back sides).

[0219] As described above, an intermediate stage paper container with a zipper (flat state) 91 was produced (see FIG. 2).

[0220] 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.

[0221] Below the upper stacking 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 3).

[0222] 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.

[0223] 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.

[0224] 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.

[0225] The dimensions of the completed paper container, which was approximately rectangular parallelepiped, were 95 mm in width, 120 mm in height, and 80 mm in depth.

[0226] In the manner described above, the resealable paper container 90 of this example was produced.

[0227] <Example 2> In Example 2, a paper container 90 with a zipper was produced using the blank plate 10 of Figs. 11A and 11B corresponding to the second embodiment.

[0228] The front blank plate 10b of Example 1 was used as the back blank plate 10a of this example, and the back blank plate 10a of Example 1 was used as the front blank plate 10b of this example. The front blank plate 10b was a rectangle measuring 245 mm in length and 189 mm in width, and the back blank plate 10a was a rectangle measuring 250 mm in length and 189 mm in width. Therefore, the front blank plate 10b is smaller than the back blank plate 10a. Therefore, when the top flap 45 of the resealable paper container 90 is viewed from the outside, the inner surface of the back blank plate 10a is visible.

[0229] Other aspects such as the shape of the blank plate 10, the layer structure of the laminated sheet 78, and the method of producing the resealable paper container 90 were the same as those in Example 1.

[0230] Example 3 In Example 3, a paper container 90 with a zipper was produced using the blank plate 10 of Figs. 12A and 12B corresponding to the third embodiment.

[0231] In the back side blank sheet 10a of Example 1, a back side protrusion 361a was provided on the upper edge of the back side edge seal margin 36a. The back side protrusion 361a extended upward by the same width as the back side edge seal margin 36a. The upper edge of the back side protrusion 361a was located at the same position as the front side upper edge 21b of the front side blank sheet 10b and protruded 5 mm upward from the back side upper edge 21a of the back side blank sheet 10a.

[0232] Other aspects such as the shape of the blank plate 10, the layer structure of the laminated sheet 78, and the method of producing the resealable paper container 90 were the same as those in Example 1.

[0233] Example 4 In Example 4, a paper container 90 with a zipper was produced using the blank plate 10 of Figs. 13A and 13B corresponding to the fourth embodiment.

[0234] In the back side blank sheet 10a of Example 3, a side plate protrusion 411a of the back side top portion was provided adjacent to the back side protrusion 361a of the back side edge seal portion 36a, inward. The upper edge of the back side protrusion 361a and the upper edge of the side plate protrusion 411a of the back side top portion were at the same height as the upper edge 21b of the front side blank sheet 10b. In other words, the protrusion 411a protruded 5 mm upward from the upper edge 21a of the back side blank sheet 10a.

[0235] The width of the upper edge of the side plate protrusion 411a of the top part of the back side is 14 mm, which is twice the width of the back side side edge seal margin 36a.

[0236] The line (upper edge) connecting the upper edge of the side plate protrusion 411a of the back top portion and the back upper edge 21a of the back blank plate 10a formed an angle of 45° with the back upper edge 21a.

[0237] Other aspects such as the shape of the blank plate 10, the layer structure of the laminated sheet 78, and the method of producing the resealable paper container 90 were the same as those in Example 1.

[0238] <Comparative Example> In the comparative example, a resealable paper container 80 shown in Fig. 17 was produced using one blank plate 81 as shown in Fig. 16. The external dimensions of the completed resealable paper container 80 were approximately the same as those of the example. The layer structure of the laminated sheet of the blank plate 81 was the same as that of Example 1.

[0239] <Evaluation> Fifty samples each of Examples 1 to 4 and the Comparative Example were prepared and filled with snack foods.

[0240] In the samples of Examples 1 to 4, when the user initially opened the easy-open seal portion 53, a gap was formed between the front-side opening grip margin 57b between the front-side upper edge 21b and the easy-open seal portion 53 and the back-side opening grip margin 57a ​​between the back-side upper edge 21a and the easy-open seal portion 53. The user then grasped the front-side opening grip margin 57b and the back-side opening grip margin 57a ​​with their fingers and spread them outward (in the front-to-back direction) of the resealable paper container 90.

[0241] At that time, the user was able to fully grasp the opening gripping portion 57, and was therefore able to easily peel off the easy-open seal portion 53. Then, the paper container 90 with the zipper was able to be initially opened.

[0242] After the initial opening of the resealable paper container 90, the zipper tape 61 was opened. Here, the area between the front side upper edge 21b and the front side zipper tape 61b was defined as the front side post-initial opening gripping area 571b. Also, the area between the rear side upper edge 21a and the rear side zipper tape 61b was defined as the rear side post-initial opening gripping area 571a. The user grasped the front and rear side post-initial opening gripping areas 571 with their fingers and spread them outward (in the front-to-rear direction) of the resealable paper container 90. This allowed the zipper tapes 61 provided on the upper overlapping plate 34 and the top side plates 41 on both the left and right sides to be easily released.

[0243] In the comparative example of the zippered paper container 80, the portion including the middle horizontal fold line (half fold line) 821 could be cut off and opened using a notch 877 provided on the top side plate 841 as an initial opening means and an easy-to-open processing line 851 provided on the upper overlapping plate 834 and the top side plate 841.

[0244] Next, a person grasped the front opening gripping area 857b between the front easy-open processing line 851b and the front zipper tape 861b, and the back opening gripping area 857a between the back easy-open processing line 851a and the back zipper tape 861a, with their fingers, and attempted to spread the zippered paper container 80 in the front-to-back direction.

[0245] In the comparative example of the zippered paper container 80, when the upper overlapping plate 834 and the top side plate 841 are cut along the easy-open processing line 851, the upper edges of the front upper overlapping plate 834b and the top side plate 841b become the front easy-open processing line 851b, and the upper edges of the back upper overlapping plate 834a and the top side plate 841a become the back easy-open processing line 851a.

[0246] Because the front side easy-open processed line 851b and the back side easy-open processed line 851a were at the same height, there was no gap, or even if there was a gap, it was very small, between the front side opening grip portion 857b and the back side opening grip portion 857a. Therefore, it was not easy to insert fingers between the front side opening grip portion 857b and the back side opening grip portion 857a. To open the package, a user had to insert a fingernail or a flat tool between the front side opening grip portion 857b and the back side opening grip portion 857a to pry them open, which sometimes required time to release the zipper tape 861.

[0247] Furthermore, the packages of the resealable paper containers 90 of Examples 1 to 4 in which the resealable tape 61 had been released as described above were tested for suitability for removing the contents and resealability with the resealable zipper.

[0248] 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.

[0249] Furthermore, after removing a portion of the contents, the packages of the resealable paper containers 90 of Examples 1 to 4 could be easily resealed by reattaching the zipper tape 61. The remaining contents were then properly stored.

[0250] 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]

[0251] 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 361 Side edge seal tip 37 Bottom seal 38 Top protrusion 41 Side panel of the top 411 Top side plate protrusion 43 Bottom side protrusion allowance 45 Top flap 52 Zipper tape joint 53 Easy-to-open seal 54 Easy peeling section 56 Removal opening 57 Opening grip 571 Initial opening and gripping time 61 Zipper Tape 62 Zipper tape body 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 76 Bending part of the protruding part on the top side 78 Laminated Sheet 781 Outermost thermoplastic resin layer 782 Paper base layer 783 Innermost thermoplastic resin layer 784 Intermediate adhesive layer 785 Barrier Layer 80 Conventional resealable paper container 81 Blank Board 81a Back blank board 81b Front blank board 821 Intermediate horizontal fold line (half fold line) 831 Wall Panel 834 Upper overlapping plate 841 Side plate of the top 851 Easy-open processed wire 856 Removal opening 857 Opening grip 861 Zipper tape 871 Heaven 872 Torso 874 Top protrusion 877 Notch 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 zipper in a state in which the protrusion on the top side of the present disclosure is raised 94 A paper container with a zipper in a state where the top part of the present disclosure is open A. Enlarged view of a paper container with a zipper (in a boxed state) in the intermediate stage C Cutting position of enlarged cross section of zipper tape joint D Cutting position of cross section of upper overlapping plate 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 at the top of the zipper-equipped paper container, where the front blank plate and the back blank plate are overlapped and joined, 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 opening grip is provided at the upper edge of the upper overlapping plate and the side plate of the top portion; An easy-to-open seal portion is provided below the opening grip portion and laterally on the upper overlapping plate and the side plate of the top portion, The upper edge of the front blank plate and the upper edge of the back blank plate are positioned at different positions in the vertical direction.

2. 2. The paper container with a zipper according to claim 1, wherein an upper edge of the front blank plate is located higher than an upper edge of the back blank plate.

3. 2. The paper container with a zipper according to claim 1, wherein an upper edge of the front blank plate is located lower than an upper edge of the back blank plate.

4. The resealable paper container according to any one of claims 1 to 3, wherein the front blank plate and the back blank plate have different vertical lengths but the same horizontal lengths.

5. A paper container with a zipper as described in any one of claims 1 to 4, wherein the vertical lengths of the front top flap including the front upper overlapping plate and the side plate of the front top portion in the front blank plate and the back top flap including the back upper overlapping plate and the side plate of the back top portion in the back blank plate are different.

6. A paper container with a zipper according to any one of claims 1 to 5, wherein the spacing between the first front vertical fold line and the second front vertical fold line formed on the front blank plate is the same as the spacing between the first back vertical fold line and the second back vertical fold line formed on the back blank plate.

7. 7. The paper container with a zipper according to claim 1, wherein a protruding portion is provided at the top of the seal margin on the side edge of a blank plate having an upper edge that is lower than the position of the upper edge of the front blank plate and the position of the upper edge of the back blank plate.

8. The paper container with a zipper according to any one of claims 1 to 7, wherein a zipper tape extending laterally is provided on the upper overlapping plate and the side plate of the top portion below the easy-open seal portion.

Images