Zippered paper container

Abstract

To provide a zippered paper container in which the opening of the zippered paper container can be easily opened when the male and female fitting parts of the zipper tape are disengaged and the zipper tape is opened.MEANS FOR SOLVING THE PROBLEM: In a zippered paper container 90 in which a front side blank plate 10b made of a laminated sheet 78 including a paper base layer 782 and a back side blank plate 10a are assembled, an upper overlapping plate 34 of the zippered paper container 90 is provided with an upper sealing portion 53, an easy-to-open processing line 51, a zipper tape 61, and a first horizontal folding line 22 in order from the upper edge, and the distance between the zipper tape 61 and the first horizontal folding line 22 is 20 mm or less.SELECTED DRAWING: Figure 7

Description

[Technical field]

[0001] The present disclosure relates to a paper container with a zipper, and particularly to a paper container with a zipper that is three-dimensional and self-supporting, and that has an opening that is easy to open when the male and female mating portions of the zipper tape are disengaged and the zipper tape is opened. [Background technology]

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

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

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

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

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

[0007] When opening the zipper tape 861, the upper opening gripping portion of the front zipper tape and the upper opening gripping portion of the back zipper tape are grasped with the fingers of the hand, and the zippered paper container is opened in the front-to-rear direction. At that time, there were cases where the top portion 871 did not open smoothly, and the removal opening 856 could not be opened to a sufficient size. In addition, the size of the opening grip margin was not sufficient, and the fingers of the hand were sometimes unable to grip the opening grip margin adequately when opening the zipper tape 861. Or, the opening grip margin that was being gripped may slip and fall off the fingers of the hand. As a result, it was difficult to release the zipper tape 861, and the paper container 80 with a zipper was sometimes difficult to open. [Prior art documents] [Patent documents]

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

[0009] The present disclosure has been made to solve the above problems, and its object is to provide a paper container 90 with a zipper that is easy to open the opening for removal of the zippered paper container when the male and female fitting portions of the zipper tape are disengaged and the zipper tape is opened. To provide a paper container with a zipper. [Means for solving the problem]

[0010] The above problems can be solved by the following embodiments of the present disclosure. That is, the retractable paper container 90 of the present disclosure has the following features: In a paper container 90 with a zipper, 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 formed by overlapping and joining the front blank plate 10b and the back blank plate 10a, and a top plate 33 connected to the lower side of the upper overlapping plate 34; A top side plate 41 is provided on both the left and right sides of the upper overlapping plate 34, A top-side protrusion 74 is provided on both the left and right sides of the top portion 71, A body portion 72 provided below the top portion 71; A bottom portion 73 provided on the lower side of the body portion 72; an upper seal portion 53 that crosses the upper edge portion 21 or the vicinity of the upper edge portion 21 of the upper overlapping plate 34 and the side plate 41 of the top portion; An easy-to-open processing line 51 located below the upper seal portion 53 and crossing the upper overlapping plate 34 and the side plate 41 of the top portion; A zipper tape 61 is provided below the easy-open processing line 51 and crosses the upper overlapping plate 34 and the side plate 41 of the top portion. The distance between the first horizontal folding line 22 located on the lower side of the upper overlapping plate 34 and the zipper tape 61 is 20 mm or less.

[0011] In addition, in the paper container 90 with a zipper of the present disclosure, The distance between the first horizontal folding line 22 located on the lower side of the upper overlapping plate 34 and the zipper tape 61 may be 5 mm or more.

[0012] In addition, in the paper container 90 with a zipper of the present disclosure, 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 formed by overlapping and joining the front blank plate 10b and the back blank plate 10a, and a top plate 33 connected to the lower side of the upper overlapping plate 34; A top side plate 41 is provided on both the left and right sides of the upper overlapping plate 34, A top-side protrusion 74 is provided on both the left and right sides of the top portion 71, A body portion 72 provided below the top portion 71; A bottom portion 73 provided on the lower side of the body portion 72; an upper seal portion 53 that crosses the upper edge portion 21 or the vicinity of the upper edge portion 21 of the upper overlapping plate 34 and the side plate 41 of the top portion; An easy-to-open processing line 51 located below the upper seal portion 53 and crossing the upper overlapping plate 34 and the side plate 41 of the top portion; A zipper tape 61 is provided below the easy-open processing line 51 and crosses the upper overlapping plate 34 and the side plate 41 of the top portion. The distance between the easy-open processing line 51 and the zipper tape 61 is 5 mm or more.

[0013] In addition, in the paper container 90 with a zipper of the present disclosure, The distance between the easy-open processing line 51 and the zipper tape 61 may be 20 mm or less. Effect of the Invention

[0014] According to the above-described embodiment of the present disclosure, the following paper container with a zipper can be provided: That is, when a user opens the zipper tape 61 of the paper container with a zipper 90, the user grasps the front side opening gripping portion 57b above the front side zipper tape 61b and the back side opening gripping portion 57a ​​above the back side zipper tape 61a with his / her hands, respectively, and opens the paper container with a zipper in the front-to-rear direction (front side to back side direction). At that time, since the distance between the first horizontal folding line 22 located on the lower side of the upper overlapping plate 34 and the zipper tape 61 is 20 mm or less, which is sufficiently small, the first horizontal folding line 22, as well as the upper overlapping plate 34 and the top side plate 41 adjacent to the first horizontal folding line 22, deform so as to smoothly bulge outward. Therefore, the zipper tape 61 can be smoothly opened, and a sufficiently large removal opening 56 can be secured.

[0015] In addition, because the size of each opening gripping margin 57 is sufficient, it becomes easy to grasp the opening gripping margin with the fingers of a hand, and to easily undo the zipper tape 61. Therefore, it is possible to provide a paper container 90 with a zipper that is easy to open when a user undoes the zipper tape 61 of the paper container 90 with a zipper to remove the contents. [Brief description of the drawings]

[0016] [Figure 1] FIG. 1 is a development view of a blank plate 81 used in manufacturing a paper container 80 with a zipper according to the prior art. [Diagram 2] FIG. 1 is a perspective view of a resealable paper container 80 of the prior art. [Diagram 3] 3 is a perspective view of the zippered paper container 80 shown in FIG. 2 with a top portion 871 open. [Figure 4A] 1 is a development view of a rear blank plate 10a used in manufacturing a zippered paper container 90 according to an embodiment of the present disclosure. [Figure 4B] 1 is a development view of a front blank plate 10b used in manufacturing a resealable paper container 90 according to an embodiment of the present disclosure. [Diagram 5]FIG. 5 is a front view showing the shape of a paper container (in a flat state) 91 at an intermediate stage when a paper container 90 with a zipper is produced using the blank plate 10 shown in FIGS. 4A and 4B. [Figure 6] FIG. 4C is a perspective view showing the shape of a paper container (in a raised box state) 92 at an intermediate stage when a paper container 90 with a zipper is produced using the blank plate 10 shown in FIGS. 4A and 4B. [Figure 7] 4C is a perspective view of a paper container 90 with a zipper produced using the blank plate 10 shown in FIG. 4A and FIG. 4B. [Figure 8] FIG. 8 is a side view of the zippered paper container 90 shown in FIG. [Figure 9] FIG. 8 is a plan view of the zippered paper container 90 shown in FIG. [Figure 10] 1 is a perspective view of a resealable paper container 93 with the upper seal portion removed. [Figure 11] 11 is a perspective view of the chuckable paper container 93 with the top seal portion cut away shown in FIG. 10 with the top portion 71 open. [Figure 12] 12 is an enlarged view of part A shown in FIG. 11 and is an explanatory view of lengths X and Y. FIG. [Figure 13] FIG. 12 is an explanatory diagram of a damaged wrinkle 89 that occurs when a zipper tape 861 of a zipper-equipped paper container 80 of the prior art is opened (an enlarged view referring to part A shown in FIG. 11). [Figure 14A] 1 is a cross-sectional view of a laminated sheet 78 of one embodiment of the blank plate 10. FIG. [Figure 14B] 13 is a cross-sectional view of a laminated sheet 78 of another embodiment of the blank plate 10. FIG. [Figure 14C] 13 is a cross-sectional view of a laminated sheet 78 of still another embodiment of the blank plate 10. FIG. [Figure 14D] 13 is a cross-sectional view of a laminated sheet 78 of still another embodiment of the blank plate 10. FIG. [Figure 15A] 5 is an enlarged cross-sectional view of one embodiment of a joint between a blank plate 10 and a zipper tape 61 (see cross-sectional position CC in FIG. 5). [Figure 15B] 5 is an enlarged cross-sectional view of another embodiment of the joint between the blank plate 10 and the zipper tape 61 (see cross-sectional position CC in FIG. 5). DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

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

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

[0019] The blank plate 10 of the chuckable paper container 90 of the present disclosure is formed into a rectangular outer shape using a laminated sheet 78 having at least a base paper layer and at least an innermost layer of a thermo-adhesive resin such as polyethylene, and various fold lines are provided within the blank plate 10 to separate the forming plates for each part required to form the chuckable paper container 90.

[0020] <Embodiments of the present disclosure> <Blank board> The blank plate 10 of the chuckable paper container 90 of this embodiment is shown in Figures 4A and 4B. Figure 4A shows the back blank plate 10a, and Figure 4B shows the front blank plate 10b. The back blank plate 10a and the front blank plate 10b are collectively referred to as the blank plate 10.

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

[0022] The back side upper edge portion 21a, which is the bottom side of the back side blank plate 10a in FIG. 4A, becomes the top side of the resealable paper container 90. The front-side upper edge portion 21b of the front-side blank plate 10b in FIG. 4B, which is the upper side in the drawing, becomes the upper side of the resealable paper container 90.

[0023] In both Figures 4A and 4B, the front side of the drawing corresponds to the outer side when the resealable paper container 90 is assembled, and the back side corresponds to the inner side. Figures 4A and 4B are linearly symmetrical with respect to the upper edge portions 21a and 21b, respectively, except for some of the components described below (e.g., the opening notch 55), and when the inner surfaces of the back blank plate 10a and the front blank plate 10b are aligned and overlapped, the respective components (the forming plates, lines, sealing portions, zipper tape joints, etc. described below) overlap.

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

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

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

[0027] As described above, the rear blank plate 10a and the front blank plate 10b are substantially vertically symmetrical in shape, so the blank plate 10 will be described with reference to the front blank plate 10b. Moreover, the rear blank plate 10a and the front blank plate 10b are made of the same material (layer structure) and are manufactured by the same method.

[0028] The front blank plate 10b of the zippered paper container 90 of this embodiment is formed to have a substantially rectangular outer shape using a laminated sheet 78 in which at least a base paper is laminated and at least a thermoplastic resin such as polyethylene is laminated as the innermost layer. With reference to Fig. 4B, the upper side is the front upper edge portion 21b, the left and right sides are the front side edge portions 11b, and the lower side is the front lower edge portion 26b. The front blank plate 10b has a shape that is symmetrical with respect to a vertical line passing through the center of the front blank plate 10b in the width direction. The laminated sheet 78 will be described later.

[0029] The front blank plate 10b is provided with, in the transverse direction from the front upper edge 21b, a front first horizontal fold line 22b, a front second horizontal fold line 23b, a front third horizontal fold line 24b, and a front fourth horizontal fold line 25b. It is preferable that the front side horizontal fold lines 22b, 23b, 24b, 25b are parallel to the front side upper edge 21b and the front side lower edge 26b, respectively.

[0030] The front blank plate 10b is provided with, from the left side, a front first vertical folding line 12b, a front second vertical folding line 13b, a front second vertical folding line 13b, and a front first vertical folding line 12b. That is, the vertical folding line closer to the side edge 11b of each front blank plate 10b is the front first vertical folding line 12b, and the vertical folding line farther from the side edge 11b of each front blank plate 10b is the front second vertical folding line 13b. It is preferable that each of these front longitudinal folding lines 12b, 13b is approximately parallel to the side edge portion 11b of the front blank plate 10b.

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

[0032] The front top diagonal folding line 17b starts from a front second top intersection point Fb, which is the intersection point of the front second vertical folding line 13b and the front second horizontal folding line 23b. Furthermore, the oblique folding line 17b of the front side top connects the above-mentioned second top intersection Fb of the front side to the first top intersection Eb of the front side first vertical folding line 12b and the front side first horizontal folding line 22b, and further extends to the front side side edge 11b. The intersection of the front side side edge 11b and the oblique folding line 17b of the front side top is the end point of the oblique folding line 17b of the front side.

[0033] The front bottom diagonal fold line 18b starts from a front second bottom intersection point Hb which is an intersection point of the front second vertical fold line 13b and the front third horizontal fold line 24b. Furthermore, the front bottom diagonal folding line 18b connects the front second bottom intersection point Hb and the front first bottom intersection point Gb, which is the intersection point of the front first vertical folding line 12b and the front fourth horizontal folding line 25b, and further extends to the front side edge portion 11b. The intersection point of the front side edge portion 11b and the front bottom diagonal folding line 18b is the end point of the front bottom diagonal folding line 18b.

[0034] In addition, the oblique 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 oblique 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.

[0035] In addition, the oblique folding line 17b of the top part of the front side does not contact the intersection point Eb of the first top part of the front side and may not be present in the vicinity of the intersection point Eb. Alternatively, the oblique folding line 17b of the top part of the front side may not be present between the intersection point Eb of the first top part of the front side and the side edge portion 11b of the front side. Furthermore, the oblique fold line 18b on the bottom side of the front side does not contact the first bottom intersection point Gb on the front side and may not be present in the vicinity thereof. Alternatively, the oblique fold line 18b on the bottom side of the front side may not be present between the first bottom intersection point Gb on the front side and the side edge portion 11b on the front side.

[0036] By positioning each of the above-mentioned oblique folding lines on the front side and each of the intersections in close proximity without touching each other, it is possible to maintain sufficient folding performance while preventing excessive concentration of folding lines in any particular location, thereby preventing a decrease in the strength of the laminated sheet of the front blank plate 10b.

[0037] At both left and right side edge portions 11b of the front blank plate 10b, front side edge seal portions 36b are formed via the front first vertical folding lines 12b.

[0038] Further, a front bottom seal margin 37b is formed at a front lower edge portion 26b located below the front blank plate 10b via a front fourth horizontal folding line 25b.

[0039] Further, the front blank plate 10b is provided with forming plates for each part in sequence downward from the front upper edge 21b located at the uppermost side.

[0040] Regarding the main part, 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.

[0041] Further, side plates 41b of the top part of the front side are connected to the outside of both the left and right sides of the front side upper overlapping plate 34b via the front side second vertical folding line 13b.

[0042] Further, a front top protruding portion margin 38b is connected to the outside of both the left and right sides of the front top panel 33b via the front second vertical folding line 13b.

[0043] Further, a front side panel 32b is connected to the outside of both the left and right sides of the front wall panel 31b via a front second vertical bending line 13b.

[0044] Further, a front bottom protruding portion margin 43b is connected to the outside of both the left and right sides of the front bottom panel 35b via a front second vertical folding line 13b.

[0045] In addition, the top protruding portion 38b is connected to the bottom of each top side panel 41b via the first horizontal bending line 22b. The top protruding portion 38b is connected to the bottom of the top protruding portion 38b via the second horizontal bending line 23b. The bottom protruding portion 43b is connected to the bottom of the side panel 32b via the third horizontal bending line 24b.

[0046] Bottom seal portions 37b are connected to the lower sides of the front bottom plate 35b and the front bottom protruding portions 43b on both the left and right sides thereof.

[0047] The front side edge seal portion 36b is connected to the left and right outer sides of the above-mentioned side plate 41b of the front top portion, the front top protruding portion 38b, the front side plate 32b, and the front bottom protruding portion 43b via the front first vertical fold line 12b.

[0048] Furthermore, on the upper side of the front zipper tape joint 52b, a front concave horizontal ruled line 551b is provided as a front opening hook 55b, which at least crosses between the front second vertical fold lines 13b on both the left and right sides.

[0049] In the present 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 container 90. Alternatively, the creasing process may be performed by the machine that manufactures the resealable paper container 90.

[0050] As the method for forming the creasing lines, an appropriate method is adopted from among known methods such as a platen method and a rotary die method. Also, the laminated sheet 78 may be cut into sheets before the scoring process is performed, or the laminated sheet 78 may be supplied to the scoring process in a roll form.

[0051] Next, a punching process for manufacturing the blank plate 10 by punching the laminated sheet 78 will be described. For the punching process, an appropriate method is selected from known methods such as a platen method and a rotary die method. The blank plate 10 may be formed directly from the rolled laminated sheet 78, or the sheet may be cut into sheets and then punched. The order of the creasing and punching processes does not matter. They may be done at the same time.

[0052] In addition, a roll-shaped laminated sheet 78 slit to a specified roll width may be fed to a machine for manufacturing a paper container 90 with a zipper, and the roll-shaped laminated sheet 78 may be cut in the cross direction to produce a blank plate 10.

[0053] The rear blank sheet 10a and the front blank sheet 10b are line-symmetrical and have the same shape. In other words, they are blank sheets of substantially the same shape but with the layer structure of the blank sheets reversed.

[0054] Fig. 5 is a front view showing the shape of a chucked paper container (flat state) 91 at an intermediate stage when manufacturing a chucked paper container 90 using the blank plate 10 shown in Fig. 4A and Fig. 4B. The topmost part is the upper edge 21b of the front blank plate 10b shown in Fig. 4B, and on its back side is the back blank plate 10a. The back blank plate 10a cannot be seen with the naked eye, but when viewed through, it has almost the same shape as the front blank plate 10b.

[0055] In addition, in Figure 5, the back blank plate 10a and the front blank plate 10b are overlapped, and each component has the same positional relationship when viewed through the drawing, within the range of manufacturing variations, so the notation and suffixes for the front side may be omitted in the explanation.

[0056] 5, the distance between the easy-open finish line 51 and the zipper tape 61 is shown as a first distance X. The distance between the zipper tape 61 and the first horizontal fold line 22 is shown as a second distance Y. Here, the reference position for calculating the distance (spacing) is the center of the width (length in the longitudinal direction and the perpendicular direction) of each element.

[0057] The upper overlapping plate 34 and the side plate 41 of the top front surface are provided, in a predetermined position where the two blank plates 10 mentioned above overlap each other, with an upper seal portion 53 as a transverse sealing means, an easy-open processing line 51, and a zipper tape joint portion 52, in that order from the upper edge 21.

[0058] The upper seal portion 53 is provided at or near the upper edge 21 of the upper overlapping plate 34 and each of the top side plates 41 . When the upper seal portion 53 is approximately parallel to the upper edge portion 21, the length of the upper seal portion 53 can be shortened, and no waste is generated in the blank plate 10.

[0059] The upper seal portion 53 as a transverse sealing means is formed by joining the opposing front-side upper seal portion 53b and back-side upper seal portion 53a. The joining is performed so as to traverse the entire width of the upper edge portion 21 of the resealable paper container 90 or the vicinity of the upper edge portion 21, so that the resealable paper container 90 is kept airtight.

[0060] In addition, it is desirable that the easy-open processing line 51 be approximately parallel to the upper edge portion 21. In such a configuration, it becomes easy to cut easy-open processing line 51. Also, the length of easy-open processing line 51 can be shortened.

[0061] Additionally, zipper tape joint 52 is preferably generally parallel to top edge 21 . In such a configuration, it is easy to open and close the zipper tape 61 and to remove the contents. Also, the length of the zipper tape 61 can be shortened.

[0062] <Easy-to-open processing line> The easy-open processing line 51 will now be described. The front upper overlapping plate 34b and the side plate 41b of the top part of the front side may be provided with a front easy-open processing line 51b as an opening means. By providing the easy-open processing line 51b, the zippered paper container 90 can be opened without using tools such as scissors.

[0063] As shown in FIG. 5, the easy-open processing line 51 extends from one side edge 11 to the other side edge 11 of the blank sheet 10 and exists between the upper seal portion 53 and the zipper tape 61 .

[0064] A notch 77 may be provided at either end of the easy-open processing line 51, and in this embodiment, the notch 77 is provided at the right side edge 11. The notch 77 may also be provided at the left side edge 11. Alternatively, notches 77 may be provided at both the left and right side edges 11. Providing the notch 77 makes initial opening easier.

[0065] By cutting the easy-open processing line 51 from one side edge (here the right side) 11 to the other side edge (here the left side) 11, the upper overlapping plate 34 and the side plate 41 of the top of the front side are cut transversely, and the upper seal portion 53 is also cut away, exposing the zipper tape 61.

[0066] When an intermittent half-cut line or a straight half-cut line is used for the easy-open processing line 51 of the opening means, it may be formed by a method using a normal blade, but a half-cut line with greater precision and stability can be formed by using a method using laser light irradiation, a method using ultrasonic waves, or a method called diamond cutting.

[0067] Moreover, easy-open processing line 51 may be in the shape of a band having a width. Moreover, a plurality of easy-open processing lines 51 may be provided. By providing a plurality of easy-open processing lines 51, it is possible to prevent the easy-open processing lines 51 from being cut off in an undesired manner.

[0068] Furthermore, the easy-open processing line 51 may not be provided as a processing line, and an intended opening line may be displayed by printing. In that case, the relevant portion may be opened with a blade such as scissors. The printing position may be printed at the position of the easy-open processing line 51 shown in Figures 4A and 4B.

[0069] <Zipper tape> The zipper tape 61 includes a male zipper tape 61m and a female zipper tape 61f each formed by extrusion molding, and a male zipper tape fitting portion 63m and a female zipper tape fitting portion 63f are fitted together.

[0070] <Zipper tape joining procedure> The procedure for assembling the zippered paper container 90 will be described later, but here, the procedure for joining the zipper tape 61 will be described.

[0071] In this case, the zipper tape joint portion 52 is a portion to be joined by the zipper tape 61 when assembling the zippered paper container 90.

[0072] The rear blank sheet 10a and the front blank sheet 10b are overlapped, and the side edge seal portions 36 and the upper seal portions 53 are heat sealed together. At this time, the zipper tape 61, in which the male zipper tape 61m and the female zipper tape 61f are previously fitted to 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 portion 52 of the two blank sheets 10 is heated and pressurized from the outer surfaces of the two blank sheets 10. Then, the blank sheets 10 and the zipper tapes 61 are heat-sealed (see Figs. 15A and 15B).

[0073] The method of joining the zipper tape 61 to the blank plate 10 is not limited to the above-mentioned heat sealing, and other methods such as adhesive or adhesive tape may be used.

[0074] By heat-sealing the zipper tape 61 in this manner, there is less misalignment in the heat seal compared to a method in which the male zipper tape 61m and the female zipper tape 61f are separately heat-sealed to the zipper tape joint 52, and the attachment process is simplified, so that the zipper tape 61 can be attached with high production efficiency.

[0075] <Laminated sheet of blank boards> As described above, the laminated sheet 78 used for the blank plate 10 is a laminated sheet 78 having at least a paper base layer 782 laminated thereto, and at least the innermost thermoplastic resin layer 783 made of a thermoplastic resin such as polyethylene. However, if necessary, the intermediate layers may be provided with a barrier layer 785 against water vapor, oxygen or other substances, or a strength-enhancing layer.

[0076] Furthermore, when providing a printed layer with a pattern or the like on the zippered paper container 90 of this embodiment, it is usually printed on the surface of the paper base layer 782. However, if the paper base layer 782 is not well suited for printing, a printed layer with a pattern or the like can be provided on, for example, a biaxially oriented polyethylene terephthalate film, and the film can be laminated to any of the outer layers of the paper base layer 782.

[0077] 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 and can be appropriately selected and used depending on the contents to be filled into the chuck-equipped paper container 90, taking into consideration water resistance (size degree), etc. As specific examples, wood-free paper, cup base paper, milk carton base paper, etc. can be suitably used, and the appropriate basis weight is in the range of 80 to 320 g / m2.

[0078] The thermoplastic resin layer (sealant layer) used for the innermost layer, and the outermost layer and intermediate layer as required will be explained below. The 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 copolymers (EVA), ethylene-acrylic acid copolymers (EAA), ethylene-methacrylic acid random copolymers (EMAA), ethylene-methyl acrylate copolymers (EMA), ethylene-ethyl acrylate copolymers (EEA), ionomers, polypropylene and its copolymers, polyester resins, etc., and from these, the most suitable one can be selected and used according to the contents to be filled and the conditions of storage and use.

[0079] Of the above thermoplastic resins, ethylene-methyl acrylate copolymer (EMA) and ethylene-methacrylic acid random copolymer (EMAA) are particularly excellent in thermal stability during processing such as extrusion coating, adhesion to various substrates, and low-temperature heat sealability, as well as in thin-film formability. Therefore, it is easy to extrusion coat and laminate the outermost thermoplastic resin layer, which does not require a large thickness, at a relatively thin thickness of, for example, 6 to 10 μm, making it possible to reduce the proportion of plastic materials used and also achieving cost benefits.

[0080] The thermoplastic resin layer (sealant layer) of the innermost layer, and, if necessary, the outermost layer and the intermediate layer, as described above, may be laminated by extrusion coating the resin on the laminated surface after subjecting the laminated surface to an easy-adhesion treatment such as anchor coating, corona treatment, frame (flame) treatment, etc., as necessary, or by forming the thermoplastic resin into a film in advance and laminating the film by bonding it together using a known dry laminate or extrusion laminate (sandwich laminate) method, etc.

[0081] When the barrier layer 785 is laminated on the intermediate layer of the laminated sheet 78, a metal foil such as an aluminum foil, or a deposition film in which a metal or inorganic oxide such as aluminum, silica, or alumina is deposited to a thickness of 20 to 100 nm on a base film such as a biaxially oriented polyethylene terephthalate film (hereinafter, PET film), a biaxially oriented nylon film (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 written as EVOH) film, a biaxially oriented film of nylon MXD6, a polyacrylonitrile film, and a PET film, ONy film, or OPP film provided with a coating layer of polyvinylidene chloride can be used.

[0082] 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 when a metal foil such as aluminum or a metal-deposited film is used for the barrier layer 785, the metallic feel can also be utilized in the design, so that it can also be laminated on the outer surface of the paper base layer 782. The barrier layer 785 can be easily laminated by known dry lamination or extrusion lamination (sandwich lamination), etc.

[0083] The layer structure of the laminated sheet 78 of the blank plate 10 of the chuckable paper container 90 of this embodiment is illustrated in Fig. 12A, Fig. 12B, Fig. 12C, and Fig. 12D.

[0084] FIG. 12A is a cross-sectional view of a laminated sheet 78 of a blank plate 10 consisting of three layers, the layer structure of which is as follows, with " / " indicating the boundary between adjacent layers. (Outer surface) Outermost thermoplastic resin layer 781 / Paper base layer 782 / Innermost thermoplastic resin layer 783 (inner surface)

[0085] FIG. 12B is a cross-sectional view of a laminated sheet 78 of the blank plate 10 consisting of two layers, the layer structure of which is as follows. (Outer surface) Paper base layer 782 / Innermost thermoplastic resin layer 783 (Inner surface) This layer structure is obtained by excluding the outermost thermoplastic resin layer 781 from the three-layered blank plate 10 shown in FIG. 12A.

[0086] Furthermore, when the blank plate 10 is required to have barrier properties (water vapor, oxygen, aroma retention, etc.), it can be provided with a barrier layer 785. Fig. 12C is a cross-sectional view of a laminated sheet 78 of the blank plate 10 consisting of five layers, and the layer structure is as follows. (Outer surface) Outermost thermoplastic resin layer 781 / Paper base layer 782 / Intermediate adhesive layer 784 / Barrier layer 785 / Innermost thermoplastic resin layer 783 (Inner surface)

[0087] FIG. 12D is a cross-sectional view of a laminated sheet 78 of the blank plate 10 consisting of four layers, the layer structure of which is as follows: (Outer surface) Paper base layer 782 / Middle adhesive layer 784 / Barrier layer 785 / Innermost thermoplastic resin layer 783 (Inner surface) This layer structure is obtained by excluding the outermost thermoplastic resin layer 781 from the five-layer blank plate 10 shown in FIG. 12C.

[0088] The layers of the laminated sheets 78 are bonded together by known methods such as dry lamination, extrusion coating, adhesives, etc. Note that layers for bonding the layers together may not be shown because they are thin.

[0089] <Preparation of paper container with zipper> Below is an overview of the steps taken to create an intermediate stage paper container with a zipper (flat state) 91 from a blank plate 10 for a paper container with a zipper 90, to create an intermediate stage paper container with a zipper (box-assembled state) 92, and finally to complete a package of paper container with a zipper 90 filled with the contents.

[0090] <Creating a paper container with a zipper (flat state) at the intermediate stage> When the two blank sheets 10 described above are overlapped, a zipper tape 61 having a male zipper tape 61m and a female zipper tape 61f previously fitted together is inserted into the position where the zipper tape joints 52 overlap, and the outer surfaces of each of the two blank sheets 10 are heated and pressurized to heat seal the zipper tape joints 52.

[0091] Next, the inner surfaces of the upper seal portion 53 are heat-sealed, and the inner surfaces of the seal margins 36 of the side edges adjacent to the side edge portion 11 of the blank plate 10 are heat-sealed. Then, the intermediate stage paper container with a zipper (in a flat state) 91 is formed into a bag shape with the lower edge portion 26 open.

[0092] Also, a notch 77 may be provided at each end (at the points contacting the side edges on both sides) of the easy-open processing line 51. The notch 77 may be provided at either one of the ends.

[0093] The actual production of the zippered paper container 90 is not particularly limited, but in order to improve productivity, a machine may be used that performs in-line assembly of the paper container, filling of the contents, and sealing of each joint.

[0094] In this device, a long printed laminated sheet 78 wound up in a roll can be unwound, and in a format in which the paper containers are connected horizontally, processing of folding lines, insertion and heat sealing of zipper tape 61, heat sealing of side edge seal portions 36, heat sealing of upper seal portion 53, punching of notches 77, etc. can be performed.

[0095] It should be noted that the order of the steps may be different from that described above, so long as the desired paper container 90 with a zipper can be obtained.

[0096] Here, the shape of the upper overlapping plate 34 and the shape of the side plate 41 of the top portion of the chuck-equipped paper container 90 of this embodiment will be described with reference to FIG. Top side plates 41 are connected to both the left and right sides of the upper overlapping plate 34. Here, these three forming plates are collectively referred to as the top flap 45. The top flap 45 is provided with, in order from the upper edge 21, an upper seal portion 53, an easy-open processing line 51, and a zipper tape 61, and below the zipper tape 61, the first horizontal fold line 22 is located.

[0097] Also described are a first distance X, which is the distance between the easy-open finish line 51 and the zipper tape 61, and a second distance Y, which is the distance between the zipper tape 61 and the first horizontal fold line 22. The first distance X and the second distance Y will be described later.

[0098] 15A and 15B are enlarged cross-sectional views of the joining portion of the zipper tape 61, where the zipper tape 61 and the blank plate 10 are joined in the zippered paper container (flat state) 91 at an intermediate stage. The cut portion is shown at the cross-sectional position CC in Fig. 5. Here, the blank plate 10 is exemplified by the four-layer laminated sheet 78 in Fig. 12D.

[0099] 15A, 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 portion 62f joined to the blank plate 10 and a female zipper tape fitting portion 63f having a recess that fits with the male zipper tape 61m. In addition, 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 portion 62m joined to the blank plate 10 and a male zipper tape fitting portion 63m having a protrusion that fits with the female zipper tape 61f.

[0100] 15B, a male zipper tape 61m is joined to a front blank plate 10b as a front zipper tape 61b. The male zipper tape 61m includes a male zipper tape body portion 62m joined to the blank plate 10 and a male zipper tape fitting portion 63m having a protrusion that fits with a female zipper tape 61f. In addition, 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 portion 62f joined to the blank plate 10 and a female zipper tape fitting portion 63f having a recess that fits with the male zipper tape 61m.

[0101] In addition, 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 paper container 90 with a zipper and the specifications of the manufacturing equipment for the paper container 90 with a zipper.

[0102] <Creating a paper container with a zipper (in an erected state) at the intermediate stage> A mandrel is inserted through the opening of the bottom 73 of this intermediate stage zippered paper container (flat state) 91, leaving the upper overlapping plate 34, and the lower top panel 33 is spread out front to back by the first horizontal fold line 22, and the top flap 45 consisting of the upper overlapping plate 34 and the top side panel 41 is raised upward.

[0103] Here, in order to ensure that the ridge portion 72d of the body portion 72 is bent, an auxiliary member may be brought into contact with the vicinity (including abutment) of the ridge portion 72d from the inner side and / or the outer side of the body portion 72.

[0104] Below the upper overlapping plate 34, a top portion 71 formed by the top plate 33 and a flat body portion 72 are formed, and a zippered paper container (standing state) 92 in the intermediate stage is formed in which the bottom portion 73 opens in a substantially rectangular shape. At this stage, the upper overlapping plate 34 stands upright as shown in FIG. 6.

[0105] In addition, 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 because the zippered 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.

[0106] <Forming and filling of paper containers with zippers> Next, the upper overlapping plate 34 that stands upward is folded toward the back side (the back top panel 33a side) and laid down, and the top side protrusions 74 that protrude on both the left and right sides are folded toward the side panel 32 and joined to the body 72. At this time, the folding portion 76 of the top side protrusion 74 is folded, and in order to ensure that the folding process of the top side protrusion folding line 15 of the top side 71 is performed, an auxiliary member may be brought into contact with the vicinity (including abutment) of the top side protrusion folding line 15 from the inner and / or outer side of the top side 71.

[0107] The method of joining the top protrusion 74 to the body 72 may be a method using an adhesive (hot melt, etc.), a method using an adhesive tape, a method of mechanical joining (engagement, use of a joining tool), etc. Also, when a thermoplastic resin layer (sealant layer) is provided on the outermost layer of the blank plate 10, a method of heat sealing the thermoplastic resin layer (sealant layer) may be used. A similar method is used for joining the bottom side protrusion 75 described later.

[0108] In addition, the tip of the top side protrusion 74 may be joined to the body 72 of the paper container 90 with a zipper. Also, a portion of the top-side protruding portion 74 other than the tip may be joined to the body portion 72 of the resealable paper container 90. In that case, the tip of the top-side protruding portion 74 does not need to be joined to the body portion 72 of the resealable paper container 90.

[0109] The bottom 73 of the intermediate stage zippered paper container (standing state) 92 formed as described above is turned upward, and the contents are filled through the open bottom 73, and then the bottom 73 is folded and the bottom side seal portions 37 are heat sealed together in a palm-to-palm seal format.

[0110] Then, the joined bottom side seal portion 37 is folded toward the back side (toward the back side bottom panel 35a) and laid down, and the bottom side protrusions 75 protruding from both the left and right sides are folded toward the bottom panel 35 and joined, thereby completing the packaging body of the approximately rectangular shaped zippered paper container 90.

[0111] Fig. 7 is a perspective view showing a chuck paper container 90 of this embodiment. Fig. 8 is a side view of the chuck paper container 90 shown in Fig. 7. Fig. 9 is a plan view of the chuck paper container 90 shown in Fig. 7.

[0112] The zippered paper container 90 shown in FIG. 7 has an outer shape formed into a substantially rectangular parallelepiped shape, and its body 72 has a ridge portion 72d. In addition, since the paper container 90 with a zipper is made of a flexible laminated sheet 78 mainly made of paper, it does not have a perfect rectangular parallelepiped shape, so it is made approximately rectangular parallelepiped. When the intermediate stage paper container with a zipper (standing state) 92 is produced, both the first horizontal fold line 22b on the front side and the first horizontal fold line 22a on the back side are folded in a valley shape, and the top flap 45 stands up.

[0113] <Opening operation for removing paper containers with zippers> The procedure for opening the top portion 71 of the completed package of the zippered paper container 90 containing the contents in order to remove the contents will be described. First, the top protrusion 74 joined to the body 72 is peeled off. Then, as the top protrusion 74 is lifted upward, the top side plate 41 rises up, and the upper overlapping plate 34 also rises up. The top side plate 41 and the upper overlapping plate 34 then become almost flush with each other. The top side plate 41 and the top side plate 41, which are now almost flush with each other, are combined and called the top flap 45, as explained previously.

[0114] Then, the easy-open processing line 51 is manually opened from the notch 77 provided on one side (here, the right side) of the side edge 11, and is cut until it reaches the other side edge 11 (here, the left side). Then, the upper seal portion 53 is cut off. At this stage, the zipper tape 61 has not yet been released and the container has the shape shown in Fig. 10, and this shape is called a resealable paper container 93 with the upper seal portion cut off. In addition, the portion of the top flap 45 that is cut along the easy-open processing line 51 and remains on the side of the first horizontal fold line 22 is called a cut-away top flap 46 .

[0115] Next, the front side opening gripping area 57b between the front side easy-open processing line 51b and the front side zipper tape 61b, and the back side opening gripping area 57a between the back side easy-open processing line 51a and the back side zipper tape 61a are each gripped with the fingers of a human hand, and the zipper paper container 90 is spread outwardly to open the zipper tape 61 exposed at the easy-open processing line 51. Fig. 11 shows the zipper paper container 90 with the top part 71 open.

[0116] During this opening operation of the zipper tape 61, the ends of the zipper tape 61 on the side edge portion 11 side of each blank sheet 10 are opened over substantially the entire width up to the seal margins 36 on each side edge portion. As described above, the male zipper tape 61m and the female zipper tape 61f of the zipper tape 61 are separated from each other, whereby the removal opening 56 is formed.

[0117] Here, the first distance X, which is the distance between the easy-open finish line 51 and the zipper tape 60, and the second distance Y, which is the distance between the zipper tape 60 and the first horizontal folding line 22, will be described with reference to Figures 11 and 12. Figure 12 is an enlarged view of part A shown in Figure 11. The first distance X is the distance (spacing) between the width direction of the easy-to-open processing line 51 (a direction perpendicular to the longitudinal direction of the easy-to-open processing line 51) and the center of the width of the zipper tape 61 (a direction perpendicular to the longitudinal direction of the zipper tape 61). The second distance Y is the distance (spacing) between the center of the width of the zipper tape 61 (in a direction perpendicular to the longitudinal direction of the zipper tape 61) and the center of the width of the first horizontal fold line 22 (in a direction perpendicular to the longitudinal direction of the zipper tape 61). The sum of the first distance X and the second distance Y is the longitudinal length of the resected posterior part flap 46 described above.

[0118] The size of the first distance X affects the ease of gripping the opening gripping margin 57 with the fingers. When the zipper tape 61 is opened, the position to be gripped with the fingers is approximately the center of the width of the zippered paper container 90 in the left-right direction, so the first distance X in the following range is important. In other words, the range that contributes to ease of gripping may be the narrower of either a range of 70 mm on either side of the center of the left-right width of the zippered paper container 90, or the area between the left and right second vertical fold lines 13. It is desirable that the first distance X is at least 5 mm or more so that the fingers of a hand can effectively grasp the opening gripping margin 57. When the first distance X is 5 mm or more, the fingers of a hand can effectively grasp the opening gripping margin 57 in order to open the zipper tape 61.

[0119] If the first distance X exceeds 20 mm, not only will waste occur in the stacked sheets of the resealable paper container 80, but the upper edge will protrude significantly beyond the rear wall panel when the resealable paper container 80 is completed. This may cause the upper edge to be damaged when the resealable paper container 80 is transported. Furthermore, when multiple resealable paper containers 80 are transported, there may be cases where adjacent containers cannot be sealed together, resulting in poor transport efficiency (space efficiency).

[0120] The magnitude of the second distance Y affects whether the zipper tape 61 can be released and the removal opening 56 can be smoothly expanded. When the zipper tape 61 is released and the removal opening 56 is expanded, it is desirable that the cut-out rear flap 46 bulges smoothly when viewed from the outside in a horizontal cross section as shown in FIG.

[0121] If the second distance Y exceeds 20 mm, when the zipper tape 861 is released and the removal opening 856 is expanded, the first horizontal fold line 822 near the approximate center of the width in the left-right direction of the zippered paper container 90 may be deformed into a valley fold when viewed from the outside. In this state, as the removal opening 856 is expanded, the valley fold of the first horizontal fold line 822 progresses, making it impossible to expand the removal opening 856.

[0122] In the above situation, damage may occur between the zipper tape 861 and the first horizontal folding line 822. A typical damage is damage wrinkles 89 in the vertical direction, and the damage wrinkles 89 are shown in Fig. 13, which is an enlarged portion A in Fig. 11. However, the form of the damage is not limited to damage wrinkles 89. Damage wrinkles 89 tend to occur approximately in the center of the left and right width of the zippered paper container 90. Although FIG. 11 is a drawing of this embodiment, it is also used to explain damage wrinkles 89 that occur in a paper container 80 with a zipper according to the prior art.

[0123] In addition, in the process of producing the paper container 80 with a zipper, the side edge seal portion 836 is folded to the back side, and the top flap may be tilted to the back side. In that case, the first back side horizontal fold line 822a is a valley fold with an acute angle when viewed from the outside. When the opening 856 for removal is expanded, the valley fold at the first back side horizontal fold line 822a is flattened and then deformed so as to bulge outward. However, the valley fold may not be smoothly flattened, and if the opening 856 for removal is expanded in this state, the valley fold at the first back side horizontal fold line 822a becomes even deeper. Although the above describes an example in which a valley fold occurs at the first horizontal folding line 822a on the back side, a valley fold may also occur at the first horizontal folding line 822b on the front side.

[0124] In order to make it difficult for a valley fold to occur at the first horizontal folding line 22, the second distance Y is desirably 20 mm or less. More desirably, it is 10 mm or less, which makes it even more difficult for a valley fold to occur at the first horizontal folding line 22. If the second distance Y is small, the first horizontal folding line 22 is located in a range affected by the hardness of the zipper tape 61, so that the laminate sheet 78 in that portion is less likely to bend, and therefore, a valley fold is less likely to occur at the first horizontal folding line 22.

[0125] The second distance Y is preferably 5 mm or more. If the second distance Y is less than 5 mm, the zipper tape body 62 of the zipper tape 61 and the first horizontal folding line 22 may interfere with each other, which may hinder the folding of the first horizontal folding line 22. Therefore, when forming the paper container 90 with a zipper, there is a possibility that the formation of the top portion 71 may be hindered. More preferably, the second distance Y is 7 mm or more. By doing so, interference between the zipper tape body 62 of the zipper tape 61 and the first horizontal folding line 22 can be reliably prevented. EXAMPLES

[0126] The embodiments of the present disclosure will be described more specifically below with reference to examples.

[0127] <Example 1> In Example 1, a paper container 90 with a zipper shown in FIG. 7 was produced using a blank plate 10 of FIG. 4A and FIG. 4B corresponding to this embodiment.

[0128] Two blank sheets 10 shown in Fig. 4A and Fig. 4B were prepared, and the inner surfaces of the blank sheets 10 were aligned and overlapped, and the side edge seal portions 36 of the opposing sides were heat-sealed as shown in Fig. 5, and the upper seal portion 53 was also heat-sealed. At the same time, the zipper tape 61 was also heat-sealed. In this way, a paper container with a zipper (in a flat state) 91 in the intermediate stage in which the bottom seal portion 37 was not sealed was produced.

[0129] The laminated sheet 78 of the blank plate 10 had the following structure: Fig. 12D shows a cross-sectional view of the laminated sheet 78, but the printed layer such as a pattern is not shown. (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 / m2 Nippon Paper Industries) / Intermediate adhesive layer 784 (EMAA 20μm Mitsui Dow Polychemical N0908N) / Barrier layer 785 (silica-deposited PET 12μm Dai Nippon Printing IB-PET-UBP) / The innermost thermoplastic resin layer is 783 (LDPE 40μm Japanese polyethylene LC520) (Inner side)

[0130] A method for producing the laminated sheet 78 will now be described. First, a roll of paper base layer 782 was unwound, and predetermined patterns and characters were gravure printed at predetermined positions, and the paper base layer was then wound up again into a roll.

[0131] In the next step, the above-mentioned rolled paper base layer 782 was unwound, and a barrier layer 785 (silica-deposited PET 12 μm) was laminated on the inner surface of the paper base layer 782 by extrusion lamination (sandwich lamination) with a molten intermediate adhesive layer 784 (EMAA 20 μm) interposed therebetween.

[0132] Next, an innermost thermoplastic resin layer 783 (LDPE 40 μm) was formed by extrusion lamination on the opposite side (inner side) of the paper base layer 782 of the barrier layer 785, and the product was wound up again into a roll.

[0133] In order to improve the bonding strength between the bonding layers, anchor coat treatment, corona treatment, flame treatment, etc. may be performed as necessary. Alternatively, ozone treatment may be performed on the molten resin.

[0134] Next, the roll-shaped laminated sheet 78 is unwound and subjected to processes such as scoring and punching, thereby completing the blank plate 10.

[0135] The zipper tape 61 that is heat-sealed and attached to the inner surface of the upper overlapping plate 34 and the top side plate 41 of the zipper-equipped paper container 90 has a two-layer structure in which the zipper tape body 62 that is heat-sealed is made up of both the male zipper tape 61m and the female zipper tape 61f. The zipper tape 61 has a resin layer formed of LLDPE on the side to be heat sealed to the zippered paper container 90, and a resin layer formed of MDPE on the opposite side. The male zipper tape fitting portion 63m and the female zipper tape fitting portion 63f are both formed of LLDPE, and the zipper tape bodies 62 each have a width of 7 mm.

[0136] The rear blank plate 10a and the front blank plate 10b are rectangular, measuring 250 mm in length and 189 mm in width, and have side edge seal margins 36 of 7 mm width provided on the side edges 11 on both sides as seal margins at the peripheral edges. Additionally, a bottom seal margin 37 having a width of 10 mm was provided on each of the lower edges 26 of the lower side. Further, a seal margin of an upper seal portion 53 having a width of 3 mm was provided near the upper edge portion 21 of the upper overlapping plate 34 and the side plate 41 of the top portion.

[0137] The blank plate 10 is provided with an upper overlapping plate 34, a first horizontal folding line 22, a top plate 33, a second horizontal folding line 23, a wall plate 31, a third horizontal folding line 24, and a bottom plate 35, in that order from the upper edge 21 downward.

[0138] Additionally, on both outer sides of the upper overlapping plate 34, top side plates 41 are provided via the second vertical folding lines 13. Furthermore, a top protrusion margin 38 is provided on the outer side of both sides of the top panel 33 via the second vertical folding line 13. In addition, side panels 32 are provided on the outside of both sides of the wall panel 31 via second vertical folding lines 13.

[0139] Furthermore, bottom side protrusion margins 43 are provided on the outer sides of both sides of the bottom panel 35 via second vertical folding lines 13.

[0140] An easy-open processing line 51 is provided on the upper overlapping plate 34 and the top side plate 41 at a position 15 mm below the upper edge 21 which becomes the upper edge when the inner faces of the two blank plates 10 are aligned and overlapped, as shown in Fig. 5, in the transverse direction of the top 71 of the zippered paper container 90, together with printing on the paper base layer 782 of the laminated sheet 78. The easy-open processing line 51 is provided as an intermittent half-cut line.

[0141] Also, below the easy-open finish line 51, the zipper tape 61 was heat-sealed to the inner surface of the upper overlapping plate 34 and the side plate 41 of the top part in a direction crossing the top part 71. Here, the first distance X, which is the distance between the easy-open finish line 51 and the zipper tape 61, was 5 mm. The second distance Y, which is the distance between the zipper tape 61 and the second horizontal fold line 23, was 20 mm.

[0142] Furthermore, after joining the two blank sheets 10, heat sealing the zipper tape 61, heat sealing the side edge seal portion 36, and heat sealing the upper seal portion 53 using the method described above, a notch 77 was provided on the right side edge portion 11 of the overlapping easy-open processing line 51, and a zippered paper container (flat state) 91 in the intermediate stage was produced in which the bottom seal portion 37 was left unsealed.

[0143] Next, a mandrel was inserted through the opening of the unsealed bottom side seal 37 of this intermediate stage zippered paper container (flat state) 91, leaving the upper overlapping plate 34, and the lower top plate 33 was spread out front to back by the first horizontal fold line 22, and the upper overlapping plate 34 was stood upright. A top portion 71 formed by the top plate 33 was formed under the upper overlapping plate 34, followed by a body portion 72 having a substantially rectangular horizontal cross section (a plane substantially parallel to the bottom surface), and a paper container with a zipper (standing state) 92 in the intermediate stage was formed with a bottom portion 73 opening in a substantially rectangular shape (see FIG. 6).

[0144] 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 71 were joined to the body 72. Hot melt was used for the joining. In addition, the tip of the top protrusion 74 is folded toward the inside of the zippered paper container 90 (downward before the top protrusion 74 is folded) to make it easier to join the top protrusion 74 and the body 72.

[0145] When the top-side protrusion 74 is joined to the body 72, the angle 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.

[0146] The completed paper container had a roughly rectangular parallelepiped shape with dimensions of 95 mm width, 120 mm height, and 80 mm depth. In the manner described above, the paper container 90 with a zipper of this embodiment was produced.

[0147] <Example 2> This embodiment was the same as Example 1, except that the positions of the easy-open processing line 51 and the zipper tape 61 were different.

[0148] That is, an easy-open processing line 51 is provided 15 mm below the upper edge 21 of the resealable paper container 90 as a container opening means, in the transverse direction of the top 71 of the resealable paper container 90, as shown in FIG.

[0149] In addition, below the easy-open processing line 51, with a first distance X of 20 mm, the zipper tape 61 is heat-sealed to the inner surface of the upper overlapping plate 34 and the side plate 41 of the top part in a direction crossing the top part 71 of the zippered paper container 90. The second distance Y, which is the distance between the zipper tape 61 and the second horizontal folding line 23, was 5 mm.

[0150] <Example 3> In this embodiment, the dimensions of the rear blank plate 10a and the front blank plate 10b are rectangular, 255 mm long and 189 mm wide, which is about 5 mm longer than in Example 1. This 5 mm is due to the vertical length of the top flap 45 being about 5 mm longer, and the sizes of the other forming plates are unchanged. Also, other than the top flap 45, this embodiment is similar to Example 1.

[0151] That is, an easy-open processing line 51 is provided 5 mm below the upper edge 21 of the resealable paper container 90 as a container opening means, in the transverse direction of the top 71 of the resealable paper container 90, as shown in FIG.

[0152] In addition, below the easy-open processing line 51, with a first distance X of 20 mm, the zipper tape 61 is heat-sealed to the inner surface of the upper overlapping plate 34 and the side plate 41 of the top part in a direction crossing the top part 71 of the zippered paper container 90. The second distance Y, which is the distance between the zipper tape 61 and the second horizontal folding line 23, was 20 mm. In this embodiment, the upper edge 21 protrudes outward (toward the rear side) by about 5 mm beyond the rear wall panel 31a.

[0153] <Example 4> In this embodiment, the dimensions of the rear blank plate 10a and the front blank plate 10b are rectangular, 225 mm long and 189 mm wide, which is about 25 mm shorter than in Example 1. This 25 mm is due to the vertical length of the top flap 45 being about 25 mm shorter, and the sizes of the other forming plates are unchanged. Also, other than the top flap 45, this embodiment is similar to Example 1.

[0154] That is, an easy-open processing line 51 is provided 5 mm below the upper edge 21 of the resealable paper container 90 as a container opening means, in the transverse direction of the top 71 of the resealable paper container 90, as shown in FIG.

[0155] In addition, below the easy-open processing line 51, with a first distance X of 5 mm, the zipper tape 61 is heat-sealed to the inner surface of the upper overlapping plate 34 and the side plate 41 of the top part in a direction crossing the top part 71 of the zippered paper container 90. The second distance Y, which is the distance between the zipper tape 61 and the second horizontal folding line 23, was 5 mm. In this embodiment, the upper edge 21 is recessed inward (toward the front side) by about 25 mm from the rear wall panel 31a.

[0156] <Comparative Example> <Comparative Example 1> In this comparative example, the rear blank sheet 10a and the front blank sheet 10b each had a rectangular shape with dimensions of 250 mm in length and 169 mm in width, similar to those in the first embodiment.

[0157] An easy-open processing line 51 was provided 25 mm below the upper edge 21 of the resealable paper container 90 as a container opening means, in the transverse direction of the top 71 of the resealable paper container 90, as shown in FIG.

[0158] In addition, below the easy-open processing line 51, with a first distance X of 3 mm, the zipper tape 61 is heat-sealed to the inner surface of the upper overlapping plate 34 and the side plate 41 of the top part in a direction crossing the top part 71 of the zippered paper container 90. The second distance Y, which is the distance between the zipper tape 61 and the second horizontal folding line 23, was 12 mm.

[0159] <Comparative Example 2> In this comparative example, the rear blank sheet 10a and the front blank sheet 10b each had a rectangular shape with dimensions of 250 mm in length and 169 mm in width, similar to those in the first embodiment.

[0160] An easy-open processing line 51 was provided 25 mm below the upper edge 21 of the resealable paper container 90 as a container opening means, in the transverse direction of the top 71 of the resealable paper container 90, as shown in FIG.

[0161] In addition, below the easy-open processing line 51, with a first distance X of 12 mm, the zipper tape 61 is heat-sealed to the inner surface of the upper overlapping plate 34 and the side plate 41 of the top part in a direction crossing the top part 71 of the zippered paper container 90. The second distance Y, which is the distance between the zipper tape 61 and the second horizontal folding line 23, was 3 mm.

[0162] <Comparative Example 3> In this comparative example, the dimensions of the rear blank plate 10a and the front blank plate 10b were rectangular, 270 mm in length and 189 mm in width, which was about 20 mm longer than in Example 1. This 20 mm was due to the vertical length of the top flap 45 being about 20 mm longer, and the sizes of the other forming plates were unchanged. Also, other than the top flap 45, this comparative example was the same as Example 1.

[0163] An easy-open processing line 51 was provided 10 mm below the upper edge 21 of the resealable paper container 90 as a container opening means, in the transverse direction of the top 71 of the resealable paper container 90, as shown in FIG.

[0164] In addition, below the easy-open processing line 51, with a first distance X of 25 mm, the zipper tape 61 is heat-sealed to the inner surface of the upper overlapping plate 34 and the side plate 41 of the top part in a direction crossing the top part 71 of the zippered paper container 90. The second distance Y, which is the distance between the zipper tape 61 and the second horizontal folding line 23, was 25 mm. In this embodiment, the upper edge 21 protrudes outward (toward the rear side) by about 20 mm from the rear wall panel 31a.

[0165] <Evaluation> 50 samples were prepared for each of Examples 1 to 4 and Comparative Examples 1 to 3. Snack foods were filled into the contents.

[0166] In both samples, the upper seal portion of the easy-to-open processing line could be easily cut off thanks to the notch provided on the side plate of the top part as an initial opening means and the easy-to-open processing line provided on the upper overlapping plate and the side plate of the top part. Next, the front opening gripping area between the front easy-open processing line and the front zipper tape, and the back opening gripping area between the back easy-open processing line and the back zipper tape were each grasped with a person's fingers and spread out toward the outside of the zippered paper container.

[0167] At that time, in the case of the paper containers 90 with a zipper of Examples 1 to 4, the user was able to adequately grip the opening gripping portion 57 and therefore was able to separate the zipper tape 61.

[0168] In the paper containers 90 with zippers of Examples 1 to 4, when the zipper tape 61 was released and the opening 56 for taking out was expanded, the top flap 46 after the removal could be smoothly expanded outward. Furthermore, the first horizontal fold line 22 was not folded in a valley when viewed from the outside. Therefore, the opening 56 for taking out was sufficiently large. Furthermore, no damage (eg, damage wrinkle 89) occurred on the upper overlapping plate 34 between the zipper tape 61 and the first horizontal folding line 22.

[0169] In the zippered paper container 80 of Comparative Example 1, the opening grip area was not large enough to be gripped adequately by the fingers of the hand, and the zipper tape 861 could not be released smoothly.

[0170] In the zippered paper container 80 of Comparative Example 2, the zipper tape 861 interfered with the first horizontal fold line 822, causing problems when the first horizontal fold line 822 was bent to form the zippered paper container in the intermediate stage (raised box state).

[0171] In the chuck paper container 80 of Comparative Example 3, the upper edge of the chuck paper container 80 protruded significantly outward (toward the back side) from the back wall panel. Therefore, when transporting multiple chuck paper containers 80, adjacent chuck paper containers 80 could not be placed close to or in close contact with each other, resulting in poor space efficiency during transport. In addition, because the upper edge protruded significantly, the upper edge was easily damaged during transport, and a large external force was applied to the top flap, which sometimes caused the top protrusion 874 to unintentionally come off the body 872.

[0172] In addition, in Comparative Example 3, since the second distance Y was as large as 25 mm, when the zipper tape 861 was released and the removal opening 856 was expanded, the first horizontal fold line 822a on the back side was folded in a valley when viewed from the outside, and the resection-removed top flap could not bulge outward smoothly.

[0173] The packages of the resealable paper containers 90 of Examples 1 to 4 in which the zipper tape 61 had been released as described above were tested for suitability for removing the contents and resealability with the zipper.

[0174] The zipper tape 61 was easily released, and the top of the zippered paper container 90 was opened across almost the entire width, forming the removal opening 56. Through the removal opening 56, the snacks filled inside could be easily removed.

[0175] In addition, after removing a portion of the contents, the packages of the resealable paper containers 90 of Examples 1 to 4 were easily resealed by reattaching the zipper tape 61. The remaining contents were then properly preserved.

[0176] Furthermore, in the retractable paper container 90 of the present disclosure, the mass ratio of paper to the total mass of the retractable paper container 90 fully satisfied the standard for a paper container of 51% by mass or more. [Explanation of symbols]

[0177] 10 Blank Board 10a Back blank plate 10b Front blank plate 11 Side edge 12 First vertical fold line 13 Second vertical fold line 14 Second vertical fold imaginary line 15. Top protruding part fold line 17 Top diagonal fold line 18 Bottom diagonal fold line 21 Upper edge 22 First horizontal fold line 23 Second horizontal fold line 24 Third horizontal fold line 25 Fourth horizontal fold line 26 Lower edge 31 Wall Panel 32 Side plate 33 Top plate 34 Upper overlapping plate 35 Bottom plate 36 Side edge seal allowance 37 Bottom seal 38 Top protruding part 41 Side plate of the top 43 Bottom side protrusion allowance 45 Top flap 46 Excision posterior parietal flap 51 Easy-open processed wire 52 Zipper tape joint 53 Upper seal part 56 Removal opening 57 Opening grip 61 Zipper Tape 62 Zipper Tape Body 63 Zipper tape fitting 71 Top of zippered paper container 72 Body of a paper container with a zipper 72d Ridge of the torso 73 Bottom of zippered paper container 74 Top protrusion 75 Bottom protrusion 76 Bend of top protruding part 77 Notch 78 Laminated Sheet 781 Outermost thermoplastic resin layer 782 Paper base layer 783 Innermost thermoplastic resin layer 784 Middle adhesive layer 785 Barrier Layer 788 Paper base protective layer 80 Conventional paper container with zipper 81 Blank Board 81a Back blank plate 81b Front blank plate 812 First vertical fold line 821 Intermediate horizontal fold line (half fold line) 831 Wall Panel 833 Top plate 834 Upper overlapping plate 835 Bottom plate 836 Side edge seal allowance 851 Easy-open processed wire 856 Removal opening 861 Zipper Tape 871 Top of zippered paper container 872 Body of paper container with zipper 873 Bottom of zippered paper container 89 Damaged wrinkles 90 The zippered paper container of the present disclosure 91 Paper container with a zipper in the intermediate stage of the present disclosure (flat state) 92 Paper container with a zipper in the intermediate stage of the present disclosure (in a raised state) 93 A paper container with a zipper in which the upper seal portion of the present disclosure has been removed A: Enlarged view of the area of ​​the upper stacking plate on the front side of an opened zippered paper container C Cutting position of the enlarged cross-sectional view of the zipper tape joint E First top intersection (intersection of the first vertical fold line and the first horizontal fold line) F Second top intersection (intersection of the second vertical fold line and the second horizontal fold line) G First bottom intersection (intersection of the first vertical fold line and the fourth horizontal fold line) H Second bottom intersection (intersection of the second vertical fold line and the third horizontal fold line) X is the first distance between the easy-open processing line and the zipper tape Y is the second distance between the zipper tape and the first horizontal fold line

Claims

[Claim 1] In a paper container with a zipper, a blank plate made of a laminated sheet including a paper base layer is assembled, The blank plate includes at least a front blank plate and a back blank plate, A top part including an upper overlapping plate formed by overlapping and joining the front blank plate and the back blank plate to the top of the zipper-equipped paper container, and a top plate connected to the lower side of the upper overlapping plate; A top side plate connected to both the left and right sides of the upper overlapping plate; A top portion protruding portion provided on both the left and right sides of the top portion; A body portion provided below the top portion; A bottom portion provided on the lower side of the body portion; An upper seal portion that crosses the upper edge portions or the vicinity of the upper edge portions of the upper overlapping plate and the side plate of the top portion; An easy-to-open processing line located below the upper seal portion and crossing the upper overlapping plate and the side plate of the top portion; A zipper tape is provided below the easy-open processing line and crosses the upper overlapping plate and the side plate of the top portion, The zippered paper container has a distance of 20 mm or less between a first horizontal folding line located on the lower side of the upper overlapping plate and the zipper tape.

Images