Paper containers, paper containers with zippers

Abstract

To provide a paper container 96 which can be easily peeled off when a user peels off a seal part 53 which is easily opened to take out contents when a seal part 53 which is easily opened to seal an upper part 71 is provided in a paper container 96 of the present disclosure.SOLUTION: A paper container 96 in which a front side blank plate 10b and a rear side blank plate 10a made of a laminated sheet 78 including a paper base material layer 782 are assembled, comprises an opening gripping tab 57 attached at a top edge part 21 of the upper overlapping plate 34 and a side plate 41 of the top part of the paper container 96, an easy-opened seal part 53 which is located below the opening gripping tab 57 and traverses the upper overlapping plate 34 and the side plate 41 of the top part, and a fixing member 65 provided on the upper overlapping plate 34 and the side plate 41 of the top part; in the top edge part 21, an air gap part 58 is provided between the front side blank plate 10b and the rear side blank plate 10a.SELECTED DRAWING: Figure 8

Description

Technical Field

[0001] The present disclosure relates to paper containers and paper containers with a chuck, and particularly to paper containers and paper containers with a chuck that have a three-dimensional shape and self-standing properties and are easy to open the opening in the field of paper containers.

Background Art

[0002] Conventionally, as a paper container with a chuck, a technique such as that of Patent Document 1 has been disclosed. That is, a chuck is provided on the upper part of a rectangular parallelepiped paper container, and when taking out the contents, the chuck can be opened, and when the contents have been taken out, the chuck can be closed.

[0003] With the above technique, it is possible to protect the contents and prevent the contents from spilling when the paper container is overturned. Also, since it is a paper container, it is easy to reduce the volume of the container after consuming the contents and to discard it. FIG. 23 shows a perspective view of a conventional paper container 80 with a chuck.

[0004] In addition, unless otherwise specified hereinafter, referring to FIG. 23, with the outer wall panel 831b of the table as the front, the front, back, left, right, top, and bottom of the paper container 80 with a chuck are shown. Also, the reference numerals used when explaining the conventional technology are in the 80s or 800s in order to distinguish them from the paper containers of the present disclosure. Also, the subscript a of the reference numeral indicates an element on the back side of the paper container 80 with a chuck, and the subscript b indicates an element on the front side. In an element having both a and b as subscripts, the reference numeral without a subscript may include both a and b. The same applies to the paper container 90 and the paper container 96 with a chuck of the present disclosure described later.

[0005] In the resealable paper container 80 described in Patent Document 1, when the top 871 is opened and the contents are removed, first the top protrusion 874 is removed from the body 872, then the easy-open processing line 851 is cut, and then the male and female fitting parts of the zipper tape 861 are separated, opening the removal opening. The contents are then removed through the removal opening.

[0006] When opening the zipper tape 861, the user grasps the front opening grip tab 857b on the upper side of the front zipper tape 861b and the back opening grip tab 857b on the upper side of the back zipper tape 861a with their fingers, and opens the zippered paper container 80 in the front-to-back direction. At this time, the front opening grip tab 857b and the back opening grip tab 857a sometimes become tightly attached, eliminating any gap. As a result, it becomes difficult for the user to insert their fingers, making it difficult to separate the zipper tape 861, and thus difficult to open the zippered paper container 80.

[0007] When manufacturing the resealable paper container 80, the easy-open processing line 851 is a weak point in the blank plate. If the easy-open processing line 851 is accidentally bent, it becomes difficult to manufacture the resealable paper container 80, and the blank plate may become a defective product and be discarded. [Prior art documents] [Patent Documents]

[0008] [Patent Document 1] Japanese Patent Publication No. 2022-042268 [Overview of the project] [Problems that the invention aims to solve]

[0009] This disclosure was made to solve the above-mentioned problems, and in the resealable paper container 90, an opening means is used as a means of initial opening instead of an easy-open processing line. The objective is to provide a resealable paper container 90 in which the number of failures during the manufacturing of the resealable paper container 90 is reduced and the loss of blank plates 10 is reduced. Furthermore, the present invention provides a resealable paper container 90 that is easy for the user to open when initially opening the resealable paper container 90 with their fingers. The present invention also provides a paper container 96 that has a similar shape except for the absence of a resealable tape 61, and that has a three-dimensional shape and is self-supporting. [Means for solving the problem]

[0010] Embodiments of the present disclosure relate to the following [1] to [8].

[0011] [1] In a paper container 96 from which a blank plate 10 consisting of a laminated sheet 78 including a paper base material layer 782 is assembled, The blank plate 10 consists of at least a front blank plate 10b and a back blank plate 10a Includes, The top of the paper container 96 is a top section 71 consisting of 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 bottom of the upper overlapping plate 34. The top side panels 41 are connected to both the left and right sides of the upper overlapping plate 34, The top portion 71 has top portion projections 74 connected to both the left and right sides, The torso portion 72 is located below the aforementioned top portion 71, The bottom portion 73 provided below the body portion 72, An opening gripping tab 57 is provided on the upper edge 21 of the upper overlapping plate 34 and the upper side plate 41 of the top part, Located below the opening grip 57, it includes an easy-open seal portion 53 that crosses the upper overlapping plate 34 and the top side plate 41, The upper overlapping plate 34 and / or the side plate 41 of the top part are provided with a fixing member 65. A paper container 96 provided with a gap portion 58 between the front blank plate 10b and the back blank plate 10a at the upper edge portion 21.

[0012] [2] The paper container 96 according to [1], wherein the fixing member 65 is spaced apart from the upper edge portion 21.

[0013] [3] The paper container 96 according to [1] or [2], wherein the fixing member 65 extends in the lateral direction. <000008憨0> [4] The paper container 96 according to [1] or [2], wherein the fixing members 65 are scattered in the lateral direction.

[0015] [5] The paper container 96 according to any one of [1] to [4], provided with a gap auxiliary line 59 that contacts the fixing member 65.

[0016] [6] The paper container 96 according to any one of [1] to [5], wherein the fixing member 65 is provided at least on the outside of the front blank plate 10b and / or the outside of the back blank plate 10a. <00憨000憨1>

[0017] [7] The paper container 96 according to any one of [1] to [5], wherein the fixing member 65 is provided at least on the inside of the front blank plate 10b and / or the inside of the back blank plate 10a.

[0018] [8] In the paper container 96 according to any one of [1] to [7], a chucked paper container 90 provided with a chuck tape 61 extending in the lateral direction on the underside of the easy-open seal portion 53, on the upper overlapping plate 34 and the side plate 41 of the top part.

Advantages of the Invention

[0019] According to the embodiments of the present disclosure described above, the following paper container 96 and resealable paper container 90 can be provided. In other words, in the upper edge portion 21 of the paper container 96 and the resealable paper container 90 of this disclosure, a gap 58 is provided between the front blank plate 10b and the back blank plate 10a. When a user opens the easy-open seal portion 53 provided on the top portion 71 of the paper container 96 and the resealable paper container 90 containing the contents, it becomes easier to insert fingers into the gap 58 between the front upper edge portion 21b and the back upper edge portion 21a, so that the front opening grip portion 57b and the back opening grip portion 57a ​​become easier to grasp with fingers.

[0020] When a user grasps the front opening grip tab 57b and the back opening grip tab 57a with their fingers and opens the paper container 96 or resealable paper container 90 in the front-to-back direction, the easy-open seal portion 53 peels off. Therefore, the paper container 96 or resealable paper container 90 is made easy to open when a user peels off the easy-open seal portion 53 to remove the contents. [Brief explanation of the drawing]

[0021] [Figure 1A] This is an unfolded view of the front blank plate 10b used in the manufacture of the zippered paper container 90 according to the first embodiment of the first model. [Figure 1B] This is an unfolded view of the back blank plate 10a used in the manufacture of the first embodiment of the first resealable paper container 90. [Figure 2] This is a front view showing the shape of the zippered paper container 91 in the first intermediate stage, which is a planar state, as it is an intermediate stage in the manufacturing of a zippered paper container 90 using the blank plate 10 shown in Figures 1A and 1B. [Figure 3] This is a perspective view showing the shape of the resealable paper container 92 in the second intermediate stage of manufacturing a resealable paper container 90 using the blank plate 10 shown in Figures 1A and 1B, and in the assembled state. [Figure 4]Figure 3 is a perspective view showing the shape of the third intermediate stage paper container 95, in which a deformable portion 55 and a fixing member 65 are provided on the upper overlapping plate 34 of the second intermediate stage paper container 92 shown in Figure 3. [Figure 5] This is a perspective view of a resealable paper container 90 made using the blank plate 10 shown in Figures 1A and 1B. [Figure 6] Figure 5 is a side view of the resealable paper container 90. [Figure 7] Figure 5 is a plan view of the resealable paper container 90. [Figure 8] This is a perspective view of a resealable paper container 93 with a protruding top portion 74 raised. [Figure 9] This is a perspective view of a resealable paper container 94 with an open top 71. [Figure 10A] This is a cross-sectional view of a laminated sheet 78 in one aspect of the blank plate 10. [Figure 10B] This is a cross-sectional view of a laminated sheet 78 in another embodiment of the blank plate 10. [Figure 10C] This is a cross-sectional view of a laminated sheet 78 in yet another embodiment of the blank plate 10. [Figure 10D] This is a cross-sectional view of a laminated sheet 78 in yet another embodiment of the blank plate 10. [Figure 11A] This is an enlarged cross-sectional view of one aspect of the joint between the blank plate 10 and the chuck tape 61. (See cross-sectional position CC shown in Figure 2). [Figure 11B] This is an enlarged cross-sectional view of another aspect of the joint between the blank plate 10 and the chuck tape 61. (See cross-sectional position CC shown in Figure 2). [Figure 12A] This is an end view of the upper edge 21 of the zippered paper container 93, as seen from the direction of arrow B in Figure 8, with the top projection 74 raised. (See direction of arrow B in Figure 8.) [Figure 12B] This is a cross-sectional view of the upper overlapping plate 34 of the zippered paper container 93 at cross-sectional position QQ shown in Figure 12A, with the top protruding portion 74 raised. [Figure 13A]This is an end view of the upper edge 21 of a zippered paper container 93 with the top projection 74 raised, as in the second aspect of the first embodiment. (See the direction of arrow B in Figure 8.) [Figure 13B] This is an end view of the upper edge 21 of a zippered paper container 93 with the top projection 74 raised, as in the third aspect of the first embodiment. (See the direction of arrow B in Figure 8.) [Figure 13C] This is an end view of the upper edge 21 of a resealable paper container 93 with a raised top portion (see direction of arrow B in Figure 8) protruding portion 74 in the fourth aspect of the first embodiment. [Figure 14A] This is a cross-sectional view of the upper overlapping plate 34 at the cross-sectional position PP shown in Figure 3. It is also an explanatory diagram of the method for processing the deformed portion 55, the fixing member 65, and the gap portion 58 on the upper edge portion 21. [Figure 14B] This is an explanatory diagram of a method for processing the deformed portion 55, the fixing member 65, and the gap portion 58 on the upper edge portion 21. [Figure 14C] This is an explanatory diagram of a method for processing the deformed portion 55, the fixing member 65, and the gap portion 58 on the upper edge portion 21. [Figure 14D] This is an explanatory diagram of a method for processing the deformed portion 55, the fixing member 65, and the gap portion 58 on the upper edge portion 21. [Figure 14E] This is a cross-sectional view of the upper overlapping plate 34 at the cross-sectional position TT shown in Figure 14D. It is also an explanatory diagram of the method for processing the deformed portion 55, the fixing member 65, and the gap portion 58 on the upper edge portion 21. [Figure 14F] This is an explanatory diagram of a method for processing the deformed portion 55, the fixing member 65, and the gap portion 58 on the upper edge portion 21. [Figure 15A] This is a partially enlarged view of the upper overlapping plate 34b on the front side of a zippered paper container 93, in the first embodiment of the first embodiment, with the top protruding portion raised. [Figure 15B] This is a partially enlarged view of the upper overlapping plate 34b on the front side of a zippered paper container 93, in another embodiment of the first aspect of the first embodiment, with the top protrusion raised. [Figure 16A] This is an unfolded view of the back blank plate 10a used in the manufacture of the zippered paper container 90 of the second embodiment. [Figure 16B] This is an unfolded view of the front blank plate 10ba used in the manufacture of the zippered paper container 90 of the second embodiment. [Figure 17] Figures 16A and 16B show an intermediate stage in the manufacturing of a zippered paper container 90 using the blank plate 10, and this is a front view showing the shape of the zippered paper container 91 in a planar state during the first intermediate stage. [Figure 18A] In the second embodiment, this is a plan view of the upper edge 21 of the zippered paper container 93 with the top projection 74 raised. (See the direction of arrow B in Figure 8.) [Figure 18B] This is a cross-sectional view of the upper overlapping plate 34 of the zippered paper container 93 with the top protruding portion 74 raised at the cross-sectional position RR shown in Figure 18A. [Figure 19A] This is a partially enlarged view of the upper overlapping plate 34b on the front side of the zippered paper container 93, in the second embodiment, with the top protrusion raised. [Figure 19B] This is a partially enlarged view of the upper overlapping plate 34b on the front side of a zippered paper container 93, in another embodiment of the second embodiment, in which the top protrusion is raised. [Figure 20A] This is a plan view of the upper edge 21 of the zippered paper container 93 with the top projection 74 raised, in the first embodiment of the third embodiment. (See the direction of arrow B in Figure 8.) [Figure 20B] This is a cross-sectional view of the upper overlapping plate 34 of the zippered paper container 93 with the top protruding portion 74 raised at the cross-sectional position SS shown in Figure 20A. [Figure 21A] This is a plan view of the upper edge 21 of the zippered paper container 93 with the top projection 74 raised, as in the second aspect of the third embodiment. (See the direction of arrow B in Figure 8.) [Figure 21B] This is a plan view of the upper edge 21 of the zippered paper container 93 with the top projection 74 raised, as in the third aspect of the third embodiment. (See the direction of arrow B in Figure 8.) [Figure 21C]This is a plan view of the upper edge 21 of the zippered paper container 93 with the top projection 74 raised, as shown in the fourth aspect of the third embodiment. (See the direction of arrow B in Figure 8.) [Figure 22A] In the fourth embodiment, this is a plan view of the upper edge 21 of the zippered paper container 93 with the top projection 74 raised. (See the direction of arrow B in Figure 8.) [Figure 22B] This is a cross-sectional view of the upper overlapping plate 34 of the zippered paper container 93 at cross-sectional position UU shown in Figure 22A, with the top protruding portion 74 raised. [Figure 23] This is a perspective view of a conventional resealable paper container 80. [Modes for carrying out the invention]

[0022] The present disclosure will be explained below with reference to the drawings. However, this disclosure is not limited to these specifically shown forms or the various specifically described structures. Please note that in each diagram, the size and proportions of the components may be altered or exaggerated for clarity. Also, unnecessary or repetitive symbols may be omitted for readability.

[0023] Furthermore, the numerical values ​​such as dimensions and material names of each component described herein are merely examples of embodiments and are not limiting; they can be selected and used as appropriate. In this specification, terms that specify shapes and geometric conditions, such as parallel, orthogonal, and perpendicular, are used not only in their strict sense but also to include substantially the same conditions.

[0024] The following descriptions of embodiments will be based on the paper container 90 equipped with a zipper tape 61. The shape of the paper container 96 without a zipper tape is the same as that of the paper container 90 with a zipper, except that it does not have a zipper tape 61, in terms of shape, blank plate material, etc. Furthermore, the manufacturing method of the paper container 96 without a zipper tape is the same as that of the paper container 90 with a zipper, except that there is no step of attaching the zipper tape 61.

[0025] The blank plate 10 of the resealable paper container 90 of this disclosure is formed in a rectangular shape using a laminated sheet 78 in which a paper base material layer 782 is laminated and at least the innermost layer is a thermoplastic resin such as polyethylene, and various folding lines provided within the blank plate 10 divide the forming plates for each part necessary for forming the resealable paper container 90.

[0026] <First aspect of the first embodiment> <Blank plate> The blank plates 10 of the zippered paper container 90 of this embodiment are shown in Figures 1A and 1B. Figure 1A shows the back blank plate 10a, and Figure 1B shows the front blank plate 10b. The two blank plates, the back blank plate 10a and the front blank plate 10b, are collectively referred to as the blank plate 10.

[0027] Furthermore, unless otherwise specified, in each component of the blank plate 10 described later, 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. In elements that have both subscripts 'a' and 'b', symbols without subscripts may include both 'a' and 'b'.

[0028] The upper back edge 21a, which is the bottom of the drawing of the back blank plate 10a in Figure 1A, becomes the top of the zippered paper container 90. The upper edge 21b of the front blank plate 10b in Figure 1B is the top of the zippered paper container 90.

[0029] In both Figure 1A and Figure 1B, the front side of the drawing represents the outer surface of the assembled zippered paper container 90, and the back side represents the inner surface. Figures 1A and 1B are symmetrical with respect to their respective upper edges 21a and 21b. When the inner surfaces of the back blank plate 10a and the front blank plate 10b are aligned and superimposed, each component (such as the molded plates, lines, sealing parts, and chuck tape joints described later) overlaps.

[0030] The front blank plate 10b and the back blank plate 10a, which are aligned and stacked as described above, are joined together to produce the first intermediate stage zippered paper container 91 in the planar state shown in Figure 2. Next, the second intermediate stage zippered paper container 92 in the folded state shown in Figure 3 is produced. Furthermore, a deformable portion 55 and a fixing member 65 are provided on the upper overlapping plate 34 of the second intermediate stage zippered paper container 92, and a gap portion 58 is provided, producing the third stage zippered paper container 95 shown in Figure 4. The process then proceeds toward the completion of the zippered paper container 90 shown in Figure 5, the manufacturing method of which will be described later.

[0031] Unless otherwise specified, Figure 1B will be used to indicate the top, bottom, left, and right sides of the front blank plate 10b. The back blank plate 10a will also be described with its upper edge 21a as the top. Therefore, in Figure 1A, the top and bottom are reversed. In the resealable paper container 90, the upper edge 21 is considered the upper side, and the lower edge 26 is considered the lower side.

[0032] The formed resealable paper container 90, as will be explained later, is composed of a top section 71, a body section 72, and a bottom section 73, in that order from the top. The top section is sometimes referred to as the top section, and the bottom section as the bottom section. (See Figure 5). Furthermore, when describing the vertical direction of each component provided on the top portion 71, the term "top portion" may refer to the upper edge portion 21, and when describing the vertical direction of each component provided on the bottom portion 73, the term "bottom portion" may refer to the lower edge portion 26.

[0033] As described above, the back blank plate 10a and the front blank plate 10b are almost symmetrical in shape vertically, so the explanation of the blank plate 10 will be given using the front blank plate 10b. In addition, the back blank plate 10a and the front blank plate 10b are the same in terms of material (layer structure) and manufacturing method.

[0034] The front blank plate 10b of the zippered paper container 90 in this embodiment is formed in a substantially rectangular shape using a laminated sheet 78 which is made by laminating at least a base paper and laminating at least a thermoplastic resin such as polyethylene as the innermost layer. Referring to Figure 1B, the top is the front upper edge portion 21b, both the left and right sides are the front side edges portion 11b, and the bottom is the front lower edge portion 26b. Furthermore, the front blank plate 10b has a symmetrical shape with respect to a vertical line passing through its center in the width direction as the axis of symmetry. The laminated sheet 78 will be explained later.

[0035] The front blank plate 10b is provided with, in order from the upper edge 21b of the front surface, a first transverse fold line 22b, a second transverse fold line 23b, a third transverse fold line 24b, and a fourth transverse fold line 25b, all located in the transverse direction. It is desirable that the transverse fold lines 22b, 23b, 24b, and 25b on the front surface are parallel to the upper edge 21b and the lower edge 26b of the front surface, respectively.

[0036] The front blank plate 10b is provided with, in order from the left, a first front vertical fold line 12b, a second front vertical fold line 13b, a second front vertical fold line 13b, and a first front vertical fold line 12b. In other words, the vertical fold line on the side edge 11b of each front blank plate 10b is the first front vertical fold line 12b, and the vertical fold line on the side edge 11b of each front blank plate 10b is the second front vertical fold line 13b. It is desirable that the vertical fold lines 12b and 13b on the front side are approximately parallel to the side edge 11b of the front blank plate 10b.

[0037] Furthermore, a pair of diagonal fold lines 17b on the top of the front surface and a pair of diagonal fold lines 18b on the bottom of the front surface are provided on the left and right sides, respectively, and the forming plates for each part necessary for forming the zippered paper container 90 are partitioned and configured.

[0038] The diagonal fold line 17b on the top of the front surface originates from the intersection point Fb on the top of the front surface, which is the intersection point of the second vertical fold line 13b on the front surface and the second horizontal fold line 23b on the front surface. Furthermore, the diagonal fold line 17b on the top of the front surface connects the above-mentioned second top surface intersection Fb to the first top surface intersection Eb, which is the intersection of the first vertical fold line 12b and the first horizontal fold line 22b on the front surface, and extends further to the side edge 11b on the front surface. The intersection of the side edge 11b on the front surface and the diagonal fold line 17b on the top of the front surface is the endpoint of the diagonal fold line 17b on the top of the front surface.

[0039] The diagonal fold line 18b on the bottom of the front surface originates from the second bottom intersection point Hb on the front surface, which is the intersection point of the second vertical fold line 13b on the front surface and the third horizontal fold line 24b on the front surface. Furthermore, the diagonal fold line 18b on the front bottom connects the above-mentioned second bottom intersection Hb on the front with the first bottom intersection Gb on the front, which is the intersection of the first vertical fold line 12b on the front and the fourth horizontal fold line 25b on the front, and extends further to the side edge 11b on the front. The intersection of the side edge 11b on the front and the diagonal fold line 18b on the front bottom is the endpoint of the diagonal fold line 18b on the front bottom.

[0040] Note that the diagonal fold line 17b on the front top may be located near the intersection point Fb on the second top of the front, but not necessarily in contact with it. Furthermore, the diagonal fold line 17b on the top of the front surface does not touch the first intersection point Eb on the top of the front surface, and does not need to exist in its vicinity. Alternatively, the diagonal fold line 17b on the top of the front surface does not need to exist between the first intersection point Eb on the top of the front surface and the side edge 11b on the front surface.

[0041] The diagonal fold line 18b on the front bottom may be located near the second bottom intersection Hb on the front, but not in contact with it. Furthermore, the diagonal fold line 18b on the front bottom does not touch the first bottom intersection Gb on the front, and may not exist in its vicinity. Alternatively, the diagonal fold line 18b on the front bottom may not exist between the first bottom intersection Gb on the front and the front side edge 11b.

[0042] By ensuring that each of the diagonal fold lines on the front side and their respective intersection points are located in close proximity without touching, sufficient bending performance is achieved while preventing excessive concentration of fold lines in specific locations, thereby preventing a decrease in the strength of the laminated sheet of the front blank plate 10b.

[0043] On both the left and right side edges 11b of the front blank plate 10b, a front side edge seal allowance 36b is formed via the front first vertical fold line 12b. Furthermore, on the lower front edge 26b located below the front blank plate 10b, a front bottom seal allowance 37b is formed via the front fourth horizontal fold line 25b. Additionally, the front blank plate 10b is provided with forming plates for each part sequentially downwards from the uppermost front edge 21b located at its very top.

[0044] To describe the main parts, a front upper overlapping plate 34b is provided below the central region of the front upper edge portion 21b. Below the front upper overlapping plate 34b, a front top panel 33b is connected via a front first horizontal fold line 22b. Below the front top panel 33b, a front wall panel 31b is connected via a front second horizontal fold line 23b. Below the front wall panel 31b, a front bottom panel 35b is connected via a front third horizontal fold line 24b.

[0045] Furthermore, the side panels 41b of the top of the front surface are connected to the outer sides of both the left and right sides of the upper overlapping front panel 34b via the second vertical folding line 13b of the front surface. In addition, the protruding parts 38b of the top of the front surface are connected to the outer sides of both the left and right sides of the top front panel 33b via the second vertical folding line 13b of the front surface. Furthermore, the side panels 32b of the front surface are connected to the outer sides of both the left and right sides of the wall panel 31b via the second vertical folding line 13b of the front surface. In addition, the protruding parts 43b of the bottom of the front surface are connected to the outer sides of both the left and right sides of the bottom front panel 35b via the second vertical folding line 13b of the front surface.

[0046] Furthermore, a front top projection 38b is attached to the underside of each front top side plate 41b via a front first horizontal fold line 22b. A front side plate 32b is attached to the underside of the front top projection 38b via a front second horizontal fold line 23b. A front bottom projection 43b is attached to the underside of the front side plate 32b via a front third horizontal fold line 24b.

[0047] The bottom sealing portion 37b is attached in conjunction with the top bottom plate 35b and the bottom protruding portions 43b on both the left and right sides thereof.

[0048] On the left and right outer sides of the top side plate 41b, the top protruding portion 38b, the side plate 32b, and the bottom protruding portion 43b of the front surface, a front side edge sealing portion 36b is provided via the first vertical folding line 12b of the front surface.

[0049] In this embodiment, the process of creating fold lines on the blank plate 10 (creasing) is performed after the laminated sheet 78 is completed, and then the laminated sheet is supplied to the machine that manufactures the zippered paper container 90. Alternatively, the creasing may be performed on the machine that manufactures the zippered paper container 90.

[0050] For the scoring process, an appropriate method will be adopted from known methods such as the platen method and the rotary die method. Alternatively, the laminated sheet 78 may be cut into sheets before the creasing process is carried out. Or, the laminated sheet 78 may be supplied to the creasing process in roll form.

[0051] Next, we will describe the punching process for manufacturing a blank plate 10 by punching out the laminated sheet 78. The punching process can be selected from known methods such as a platen method or a rotary die method. The blank plate 10 may be formed directly from the roll-shaped laminated sheet 78, or it may be cut into individual sheets first and then punched out. The order of the scoring process and the punching process is not specified. They may be processed simultaneously.

[0052] Alternatively, a roll of laminated sheet 78 slit to a predetermined roll width may be supplied to a machine that manufactures a paper container with a zipper 90, where it may be cut in the transverse direction to produce a blank plate 10.

[0053] Below the upper edge 21b of the front surface, a peel-off surface section 54b extends laterally, spaced apart from the upper edge 21b. The easy-open seal section 53, which will be described later, for sealing the contents of the resealable paper container 90, is provided in the area of ​​the peel-off surface section 54b.

[0054] The easily peelable surface portion 54b may be provided when the laminated sheet 78 is in a roll, cut into sheets, or formed on a blank plate 10. The easily peelable surface portion 54b may also be provided by gravure printing, offset printing, flexographic printing, inkjet printing, silk screen printing, etc. Alternatively, it may be provided by stamping, foil stamping, etc.

[0055] The back blank plate 10a has the same shape as the front blank plate 10b, being symmetrical. In other words, it is a blank plate with the same shape but with the layer configuration reversed.

[0056] Figure 2 is a front view showing the shape of a zippered paper container in a planar state, representing an intermediate stage in the manufacturing of a zippered paper container 90 using the blank plate 10 shown in Figures 1A and 1B. This intermediate zippered paper container is called the first intermediate zippered paper container 91. The uppermost part is the upper edge 21b of the front blank plate 10b shown in Figure 1B, and a back blank plate 10a is provided on its back side. The back blank plate 10a is not visible to the naked eye, but when viewed through, it has the same shape as the front blank plate 10b.

[0057] In Figure 2, the back blank plate 10a and the front blank plate 10b overlap, and each component has the same positional relationship when viewed through the drawing, within the range of manufacturing variations. Therefore, the notation "front side" and subscripts may be omitted in the explanation.

[0058] On the upper overlapping plate 34 and the side plate 41 of the top surface, an easy-open seal portion 53 and a chuck tape joining portion 52 are provided sequentially from the upper edge 21 at predetermined positions where the two blank plates 10 described above overlap each other, serving as a means of sealing in the transverse direction. The chuck tape joining portion 52 is the corresponding location on the blank plate 10 to which the chuck tape 61 is joined.

[0059] The easy-open seal portion 53, which serves as a transverse sealing means, is formed by joining an opposing front easy-open seal portion 53b and a back easy-open seal portion 53a. Since the joining is made so as to span the entire width of the resealable paper container 90, the airtight seal of the resealable paper container 90 is maintained. If the easy-open seal portion 53 is approximately parallel to the upper edge portion 21, the length of the easy-open seal portion 53 can be shortened.

[0060] Furthermore, it is desirable that the chuck tape 61 be substantially parallel to the upper edge portion 21. In such a configuration, opening and closing the zipper tape 61 and removing the contents become easier. Furthermore, the length of the zipper tape 61 can be shortened.

[0061] <Easy-open seal section> The easy-open seal portion 53 will be described with reference to Figures 8, 9, and 12B. The easy-open seal portion 53 has the function of sealing the top portion 71 of the resealable paper container 90. Furthermore, when opening the top portion 71 of the resealable paper container 90 in order to remove the contents, it can be easily peeled off to form an opening 56 for removal. Therefore, the resealable paper container 90 can be opened with the user's fingers without using tools such as scissors.

[0062] 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, to ensure proper airtightness of the contents, it is desirable 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. To set the appropriate peel strength, an easy-peel section 54 is provided on the inner surface of the blank plate 10, at the interface where the easy-open seal section 53 is joined. The easy-peel section 54 allows the peel strength of the easy-open seal section 53 to be set appropriately.

[0063] To obtain the easily peelable seal portion 53 having the appropriate peel strength as described above, the easily peelable portion 54 is formed by applying and drying an easy-peel heat-adhesive resin or a resin coating liquid called an anti-heat sealant in a pattern using means such as gravure printing or flexographic printing.

[0064] If the easily peelable portion 54 is formed with an easy-peel heat-adhesive resin, the easy-peel heat-adhesive resin may be, for example, a resin composition obtained by appropriately mixing a polyolefin resin such as low-density polyethylene or ethylene-vinyl acetate copolymer with additives such as polystyrene, chlorinated polypropylene, polybutene-1, inorganic or organic fillers, polyethylene wax, fatty acid amide, etc.

[0065] The inorganic or organic fillers mentioned above can include powders of silica, calcium carbonate, talc, kaolin, clay, titanium dioxide, alumina, and aluminum hydroxide as inorganic fillers, with silica powder being particularly preferred. As organic fillers, powders of melamine resin, urea resin, alkyd resin, epoxy resin, acrylic resin, polystyrene, fluoroethylene resin, and silicone resin can be used.

[0066] The content of the above-mentioned additive in the above-mentioned resin composition is preferably 4% by mass or more and 40% by mass or less. If the content of the additive is less than 4% by mass, the peel strength becomes too strong, and a good easy-open seal portion 53 (easy peelability) cannot be obtained. If the content of the additive exceeds 40% by mass, the peel strength becomes too weak, which is undesirable.

[0067] The application amount of the easy-peel heat-adhesive resin described above is 2 g / m² when dry. 2 More than 8g / m 2 The following is preferable: 3 g / m 2 More than 5g / m 2 The following is even more preferable.

[0068] Furthermore, when the easily peelable portion 54 is formed with an anti-heat sealant, a resin composition obtained by mixing an appropriate amount of release agent with the base resin can be used as the anti-heat sealant. For the resin of this base material, for example, ethylcellulose, cyclocompound rubber, or acrylic resin can be used, and for the release agent, for example, silicone resin, polyethylene wax, soy lecithin, or higher fatty acid amide can be used. When applying the anti-heat sealant, the amount applied should be small, preferably with a thickness of 0.3 μm or more and 2 μm or less.

[0069] Furthermore, since the easily peelable portion 54 weakens the bonding force between the inner surfaces of the blank plate 10, it is desirable not to provide it in areas where a strong bond is desired. In this embodiment, as shown in Figure 2, it is desirable that the easily peelable portion 54 does not extend to the area of ​​the seal allowance 36 on the side edge. Considering manufacturing variations, the seal allowance 36 on the side edge and the easily peelable portion 54 may be spaced apart. The spacing may be 0.5 mm or more and 15 mm or less.

[0070] If the gap is less than 0.5 mm, there is a risk that the side edge seal allowance 36b and the easily peelable portion 54 may overlap due to manufacturing variations. If the gap exceeds 15 mm, the opening when the top 71 of the resealable paper container 90 is fully opened becomes smaller, which may make it difficult to remove the contents.

[0071] Furthermore, the vertical length (height) of the easy-peel processing section 54 may be larger than the vertical length (height) of the easy-open seal section 53 by a range of 0.5 mm to 5 mm. This is because, even if the easy-peel processing section 54 and / or the easy-open seal section 53 are displaced from their predetermined positions due to manufacturing errors, the easy-open seal section 53 will not come out of the area of ​​the easy-peel processing section 54. As a result, the width of the easy-open seal section 53 is maintained at a predetermined width, and the peel strength is stable. However, if the size is less than 0.5 mm, there is a risk that the easy-open seal section 53 will come out of the area of ​​the easy-peel processing section 54. Furthermore, if the size exceeds 5 mm, there is a risk that the easy-peel processing section 54 and the chuck tape joint section 52 will interfere with each other, hindering the joining of the chuck tape 61 and the blank plate 10, which will be described later.

[0072] In this embodiment, an easy-peel processing section 54 is provided so that the peel strength of the easy-open seal section 53 is appropriately set. However, if the peel strength can be appropriately set by other methods, it is not necessarily required to provide the easy-peel processing section 54. As an example of other methods, the heat sealing conditions (temperature, time, applied pressure, etc.) of the easy-open seal section 53 may be appropriately set. Alternatively, the peel strength may be set while reducing the effective heat sealing area by making the area of ​​the easy-open seal section 53 into a dot shape, stripe shape, etc.

[0073] <Chuck Tape> The chuck tape 61 is formed by extrusion molding of a male chuck tape 61m and a female chuck tape 61f, with the male chuck tape fitting portion 63m and the female chuck tape fitting portion 63f being fitted together.

[0074] <Instructions for joining chuck tape> The assembly procedure for the resealable paper container 90 will be explained later, but here we will explain the procedure for joining the resealable tape 61.

[0075] In this case, the zipper tape joint 52 is the planned joint for the zipper tape 61 when assembling the zippered paper container 90.

[0076] The back blank plate 10a and the front blank plate 10b are placed on top of each other, and the side edge sealing portions 36 and the easy-open sealing portions 53 are heat-sealed together. At this time, the male chuck tape 61m and female chuck tape 61f are pre-fitted together at the male chuck tape fitting portion 63m and female chuck tape fitting portion 63f, and the chuck tape 61 is inserted into this portion. Simultaneously, the chuck tape joint portion 52 is heated and pressurized from the outer surface of the two blank plates 10. Then, the blank plates 10 and the chuck tape 61 are heat-sealed. (See Figures 11A and 11B).

[0077] Furthermore, the joining of the chuck tape 61 to the blank plate 10 is not limited to the heat sealing method described above; it may also be joined by other methods such as adhesive or adhesive tape.

[0078] By heat-sealing the chuck tape 61 in this manner, the misalignment of the heat seal is reduced compared to the method of heat-sealing the male chuck tape 61m and the female chuck tape 61f separately to the chuck tape joint 52, and the installation process is simplified, allowing the chuck tape 61 to be installed with production efficiency.

[0079] <Laminated blank sheet> As mentioned above, the laminated sheet 78 used for the blank plate 10 is a laminated sheet 78 in which at least a paper base material layer 782 is laminated and at least the innermost thermoplastic resin layer 783 is a thermoplastic resin such as polyethylene. Furthermore, a barrier layer 785 for water vapor, oxygen, or other substances, or a strength-enhancing layer may be provided in the intermediate layer as needed. Note that the strength-enhancing layer does not need to provide any special barrier properties and may be a film with mechanical strength, for example a polyethylene terephthalate film.

[0080] Furthermore, when a printed layer such as a design is provided on the resealable paper container 90 of this embodiment, the printing is usually done on the outside of the paper substrate layer 782. However, if the printability of the paper substrate layer 782 is not good, the printed layer such as a design can be provided on a synthetic resin film, such as a biaxially oriented polyethylene terephthalate film, and that film can be laminated onto any of the layers on the outside of the paper substrate layer 782.

[0081] The paper base layer 782 will now be described. The paper base layer 782 is preferably made of a rigid paper that is resistant to cracking when folded along fold lines, but it is not particularly limited. A suitable paper can be appropriately selected and used depending on the contents to be filled into the resealable paper container 90, taking into consideration factors such as water resistance (size). Specific examples include fine paper, cup paper, and milk carton paper, with a basis weight of 80 g / m². 2More than 320g / m 2 The following range is desirable.

[0082] This section describes the thermoplastic resin layer (sealant layer) used in the innermost layer, and optionally in the outermost and intermediate layers. The resin used for the thermoplastic resin layer (sealant layer) can include low-density polyethylene (LDPE), linear low-density polyethylene (LLDPE), medium-density polyethylene (MDPE), high-density polyethylene (HDPE), ethylene-α-olefin copolymer polymerized using a single-site catalyst, ethylene-vinyl acetate copolymer (EVA), ethylene-acrylic acid copolymer (EAA), random copolymer of ethylene-methacrylic acid (EMAA), ethylene-methyl acrylate copolymer (EMA), ethylene-ethyl acrylate copolymer (EEA), ionomers, polypropylene and its copolymers, and polyester resins. From these, the most suitable resin can be appropriately selected and used depending on the contents being filled and the storage and usage conditions.

[0083] Among the thermoplastic resins mentioned above, ethylene-methyl acrylate copolymer (EMA) and ethylene-methacrylic acid random copolymer (EMAA) are particularly excellent in terms of thermal stability during processing such as extrusion coating, adhesion to various substrates, and low-temperature heat sealability, as well as excellent thin-film formation properties. Therefore, it is easy to extrude and laminate the outermost thermoplastic resin layer, which does not require much thickness, to a relatively thin thickness, for example, between 6 μm and 10 μm. This reduces the proportion of plastic material used and also provides cost advantages.

[0084] The innermost layer, and optionally the outermost and intermediate thermoplastic resin layers (sealant layers), can be laminated by extruding a resin coating onto their laminated surfaces after applying an easy-adhesion treatment such as an anchor coat, corona treatment, or flame treatment as needed. Alternatively, the thermoplastic resin can be pre-formed into a film, and then laminated by bonding the film using known methods such as dry lamination or extruded lamination (sandwich lamination).

[0085] When a barrier layer 785 is laminated as an intermediate layer of the laminated sheet 78, the barrier layer 785 can be a metal foil such as aluminum foil, or a vapor-deposited film in which metals or inorganic oxides such as aluminum, silica, or alumina are vapor-deposited to a thickness of 20 to 100 nm onto 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). Alternatively, ethylene vinyl acetate copolymer saponified film (hereinafter sometimes referred to as EVOH), a biaxially oriented nylon MXD6 film, a polyacrylonitrile film, and PET film, ONy film, or OPP film with a polyvinylidene chloride coating layer can be used.

[0086] Such a barrier layer 785 is usually preferably laminated on the inner surface of the paper substrate layer 782 in order to effectively utilize its barrier properties. However, if a metal foil such as aluminum or a metal vapor-deposited film is used for the barrier layer 785, it can also be laminated on the outer surface of the paper substrate layer 782 in order to utilize its metallic appearance in the design. The barrier layer 785 can be easily laminated by known methods such as dry lamination or extrusion lamination (sandwich lamination).

[0087] The layer configuration of the laminated sheet 78 of the blank plate 10 of the zippered paper container 90 in this embodiment is illustrated. Cross-sectional views of the laminated sheet 78 are shown in Figures 10A, 10B, 10C, and 10D.

[0088] Figure 10A is a cross-sectional view of a laminated sheet 78 of a blank plate 10 consisting of three layers, the layer configuration being as follows, where " / " indicates the boundary between adjacent layers. (Outer surface) Outermost thermoplastic resin layer 781 / Paper substrate layer 782 / Innermost thermoplastic resin layer 783 (inner surface)

[0089] Figure 10B is a cross-sectional view of a laminated sheet 78 of a blank plate 10 consisting of two layers, and its layer configuration is as follows. (Outer side) Paper substrate layer 782 / Innermost thermoplastic resin layer 783 (Inner side) This is a layer configuration obtained by removing the outermost thermoplastic resin layer 781 from the three-layer blank plate 10 shown in Figure 10A.

[0090] Furthermore, if barrier properties (water vapor, oxygen, aroma retention, etc.) are required for the blank plate 10, a barrier layer 785 can be provided. Figure 10C is a cross-sectional view of a laminated sheet 78 of the blank plate 10, which consists of 5 layers, and its layer configuration is as follows. (Outer surface) Outermost thermoplastic resin layer 781 / Paper substrate layer 782 / Intermediate adhesive layer 784 / Barrier layer 785 / Innermost thermoplastic resin layer 783 (Inner surface)

[0091] Figure 10D is a cross-sectional view of a laminated sheet 78 of a blank plate 10 consisting of four layers, the layer configuration of which is as follows. (Outer surface) Paper substrate layer 782 / Intermediate adhesive layer 784 / Barrier layer 785 / Innermost thermoplastic resin layer 783 (inner surface) This is the layer configuration obtained by removing the outermost thermoplastic resin layer 781 from the five-layer blank plate 10 shown in Figure 10C.

[0092] The bonding between each layer of the above laminated sheets 78 is performed by known methods such as dry lamination, extrusion coating, or adhesive. Note that the layers used for bonding between layers may not be shown due to their thinness.

[0093] <Manufacturing of resealable paper containers> The following outlines the procedure from the blank sheet 10 of the resealable paper container 90 to the first intermediate stage resealable paper container 91, then to the second intermediate stage resealable paper container 92, then to the third intermediate stage resealable paper container 95, and finally to the completion of the resealable paper container 90 package filled with contents.

[0094] <First Intermediate Stage: Production of Zippered Paper Containers> When the two blank plates 10 described above are stacked on top of each other, a chuck tape 61, which has a male chuck tape 61m and a female chuck tape 61f pre-fitted together, is inserted into the position where the chuck tape joint portions 52 overlap, and the chuck tape joint portions 52 are heated and pressurized from the outer surfaces of the two blank plates 10 to heat-seal them.

[0095] Next, the inner surfaces of the easy-open seal portions 53 are heat-sealed together, and the inner surfaces of the side edge seal portions 36 adjacent to the side edge portions 11 of the blank plate 10 are heat-sealed together. Then, the first intermediate stage zippered paper container 91 is formed into a bag shape with an opening at the bottom edge portion 26.

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

[0097] In this apparatus, a long, rolled-up printed laminated sheet 78 may be unwound to form paper containers connected horizontally, and the following processes may be performed: folding lines, insertion and heat sealing of zipper tape 61, heat sealing of the side edge seal portion 36, and heat sealing of the easy-open seal portion 53. The order of the processes may be other than those described above, as long as the desired zippered paper container 90 can be obtained.

[0098] Here, the shape of the upper overlapping plate 34 and the shape of the top side plate 41 of the zippered paper container 90 in this embodiment will be explained with reference to Figure 2. Side panels 41 are attached to both the left and right sides of the upper overlapping panel 34. These three panels together are referred to as the top flap 45. The top flap 45 is provided with an opening grip 57, an easy-open seal 53, and a zipper tape 61, starting from the upper edge 21, and a first horizontal fold line 22 is located below the zipper tape 61.

[0099] Incidentally, in the first intermediate stage of the zippered paper container 91, Figures 11A and 11B show enlarged cross-sectional views of the joint of the zipper tape 61, where the zipper tape 61 and the blank plate 10 are joined. The cutting point is shown at cross-sectional position CC in Figure 2. Here, the blank plate 10 is exemplified by the four-layer laminated sheet 78 shown in Figure 10D.

[0100] In Figure 11A, a female chuck tape 61f is joined to the front blank plate 10b as the front chuck tape 61b. The female chuck tape 61f includes a female chuck tape body portion 62f that is joined to the blank plate 10 and a female chuck tape fitting portion 63f that has a recess for fitting with the male chuck tape 61m. In addition, a male chuck tape 61m is joined to the back blank plate 10a as the back chuck tape 61a. The male chuck tape 61m includes a male chuck tape body portion 62m that is joined to the blank plate 10 and a male chuck tape fitting portion 63m that has a protrusion for fitting with the female chuck tape 61f.

[0101] In Figure 11B, a male chuck tape 61m is joined to the front blank plate 10b as the front chuck tape 61b. The male chuck tape 61m includes a male chuck tape body portion 62m that is joined to the blank plate 10 and a male chuck tape fitting portion 63m that has a protrusion that fits with the female chuck tape 61f. In addition, a female chuck tape 61f is joined to the back blank plate 10a as the back chuck tape 61a. The female chuck tape 61f includes a female chuck tape body portion 62f that is joined to the blank plate 10 and a female chuck tape fitting portion 63f that has a recess that fits with the male chuck tape 61m.

[0102] Whether a male chuck tape 61m or a female chuck tape 61f is joined to the front blank plate 10b is selected as appropriate based on the required performance of the resealable paper container 90 and the specifications of the manufacturing equipment for the resealable paper container 90.

[0103] <Second Intermediate Stage: Production of Zippered Paper Containers> A mandrel is inserted through the opening 73 at the bottom of the first intermediate-stage zippered paper container 91, leaving the upper overlapping plate 34 in place. The top plate 33 below it is spread forward and backward along the first horizontal fold line 22, causing the upper overlapping plate 34 to stand upright.

[0104] In order to ensure that the ridge portion 72d of the body portion 72 is bent properly, an auxiliary member may be brought into contact with the vicinity (including contact) of the ridge portion 72d from the inside and / or outside of the body portion 72.

[0105] Below the upper overlapping plate 34, a top section 71 made of a top plate 33 and a body section 72 are attached, forming a second intermediate stage zippered paper container 92 with a bottom section 73 that opens in a roughly rectangular shape. At this stage, as shown in Figure 3, the upper overlapping plate 34 is standing upright in the upward direction.

[0106] Although the design assumes a rectangular shape for the horizontal cross-section of the body 72 and the opening of the bottom 73, the resealable paper container 90 is made of a flexible laminated sheet 78 mainly composed of paper, so it is designed to be approximately rectangular, including cases where it is not perfectly rectangular.

[0107] <Production of resealable paper containers in the third intermediate stage> A deformable portion 55 and a fixing member 65 are provided on the upper overlapping plate 34 of the second intermediate stage zippered paper container 92, and a gap portion 58 is provided, thereby producing the third intermediate stage zippered paper container 95 shown in Figure 4.

[0108] The processing methods for the deformed portion 55, the fixing member 65, and the gap portion 58 will be explained with reference to Figures 14A, 14B, 14C, 14D, 14E, and 14F.

[0109] Figure 14A shows a cross-sectional view at the cross-sectional position PP of the resealable paper container 92 in the second intermediate stage of Figure 3. Figures 14B, 14C, 14D, 14E, and 14F are cross-sectional views at the same cross-sectional position, corresponding to the process in which the deformed portion 55, the fixing member 65, and the void portion 58 are formed.

[0110] First, let's explain Figure 14A. The front upper overlapping plate 34b and the back upper overlapping plate 34b are joined by an easy-open seal portion 53. Therefore, the front upper overlapping plate 34b and the back upper overlapping plate 34b are almost completely overlapping, and there is no gap between the front upper edge portion 21b and the back upper edge portion 21a.

[0111] The suction cup 67 is pressed against the outer surface of the front opening gripping area 57b, which is located between the upper edge 21b and the easy-open seal portion 53. As a result, the suction cup 67 is subjected to negative pressure, causing it to suck on the front opening gripping area 57b. The suction cup 67 also sucks on the back opening gripping area 57a using the same method.

[0112] Next, as shown in Figure 14B, the suction cup 67 that has attracted the front opening grip 57b moves outward, and the front opening grip 57b rotates and opens outward (to the front) with the easy-open seal portion 53 or its vicinity as the pivot point. Similarly, the back opening grip 57a also opens outward (to the back). Then, a gap is created between the upper edge portion 21b on the front and the upper edge portion 21a on the back.

[0113] Next, as shown in Figure 14C, the molding jig 66 is inserted into the gap created between the upper edge portion 21b on the front side and the upper edge portion 21a on the back side, and stops in a predetermined position. The molding jig 66 inserted here is the inner molding jig 661.

[0114] Next, as shown in Figure 14D, a pair of outer forming jigs 662 are placed on the front and back sides of the opening gripping area 57. Then, the inner forming jig 661 shown in Figure 14C and the pair of outer forming jigs 662 clamp the appropriate positions of the front opening gripping area 57b and the back opening gripping area 57a. This state is maintained until the time necessary for the gap 58 to form in the opening gripping area 57 has elapsed. Figure 14E is a cross-sectional view at the cross-sectional position TT shown in Figure 14D. The opening gripping area 57 is bent outwards by being sandwiched between the inner forming jig 661 and the outer forming jigs 662.

[0115] Next, as shown in Figure 14F, after the state in Figure 14D is maintained for a predetermined time, the pair of outer forming jigs 662 move outward and separate from the opening gripping area 57. Subsequently, the front fixing member 65b is provided on the outside of the folded portion of the front opening gripping area 57b. Similarly, the back fixing member 65a is provided on the outside of the folded portion of the back opening gripping area 57a. These fixing members 65 can maintain the folded state of the opening gripping area 57. Therefore, the gap 58 can be held stably.

[0116] In this embodiment, the fixing member 65 is made of hot melt adhesive, which is applied to the upper overlapping plate 34 in a molten state, and then cooled and solidified. The fixing member 65 is not limited to hot melt adhesive. For example, a synthetic resin member manufactured by extrusion molding, injection molding, or compression molding may be attached. If the fixing member 65 contains a thermoplastic resin and has heat-sealing properties, it may be joined to the upper overlapping plate 34 by heat sealing. Alternatively, it may be joined with an adhesive. The fixing member 65 may also be made of metal.

[0117] Furthermore, when the fixing member 65 is joined with the inner forming jig 661 inserted between the front opening gripping area 57b and the back opening gripping area 57a, the accuracy of the mounting position of the fixing member 65 is stabilized and a strong bond can be achieved.

[0118] After the fixing member 65 is attached to the opening gripping area 57, the inner forming jig 661 moves upward and separates from the opening gripping area 57. Then, the third intermediate stage zippered paper container 95 shown in Figure 4 is completed, with a gap 58 provided in the upper edge 21.

[0119] Figure 15A shows a front view of the front fixing member 65b of the zippered paper container 95 in the third intermediate stage. The front fixing member 65b is provided continuously in the lateral direction at the lower edge of the front deformation portion 55b.

[0120] Figure 15B shows another shape of the front fixing member 65b of the zippered paper container 95 in the third intermediate stage. The front fixing member 65b is provided intermittently in the lateral direction at the lower edge of the deformable front portion 55b. This reduces the amount of fixing member 65b used.

[0121] The shape of the void portion 58 may be symmetrical on the front and back, or it may be asymmetrical. The deformed portion 55 may be formed as a convex shape facing outwards on both the front and back, or it may be formed on only one of the front or back. Furthermore, the number of void portions 58 may be two or more.

[0122] Furthermore, the material of the molding jig 66 may be synthetic resin or metal. Examples of synthetic resins include polyolefins such as polypropylene and polyethylene. Ultra-high density polyethylene has excellent durability (abrasion resistance) and lubricity. Alternatively, a fluororesin with excellent lubricity and non-adhesion properties may be used.

[0123] If the molding jig 66 is made of metal, examples include structural steel, stainless steel, brass, and copper. Structural steel is inexpensive, stainless steel has excellent corrosion resistance so rust is less likely to occur and does not stain the resealable paper container 90. Brass and copper have excellent thermal conductivity, which can reduce uneven heating (uneven temperature distribution) when heating the molding jig, which will be explained later.

[0124] The molding jig 66 may be heated. When the molding jig 66 is heated, the temperature of the laminated sheet 78 in the blank plate 10 of the chucked paper container 90 that the molding jig 66 contacts rises. As a result, the laminated sheet 78 in that area softens and becomes more pliable, making it easier to process into a convex shape. Furthermore, when the heated molding jig 66 is removed from the processed deformed part 55, the temperature gradually decreases, the laminated sheet 78 hardens, and the shape is maintained.

[0125] Furthermore, the temperature of the molding jig 66 should preferably be between 40°C and 85°C. If the temperature is above 40°C, the laminated sheet 78 will soften easily. If the temperature is below 85°C, the melting point of the innermost resin will not be reached, and thus the innermost thermoplastic resin layer 783 will not be damaged. The innermost thermoplastic resin may be a polyolefin with a melting point near 100°C, so a temperature appropriately far (low) from that melting point is desirable.

[0126] The inner molding jig 661 may be cooled. When the inner molding jig 661 is cooled, the temperature of the laminated sheet 78 of the blank plate 10 of the chucked paper container 90 that the inner molding jig 661 contacts decreases. As a result, the hot melt applied to this area as a fixing member 65 solidifies in a short time, and the working time can be shortened.

[0127] Furthermore, the temperature of the inner molding jig 661 should preferably be between 10°C and 30°C. If the temperature is above 10°C, the risk of condensation forming on the inner molding jig 661 is reduced, and the risk of wetting the zippered paper container 90 is reduced. If the temperature is below 30°C, the hot melt can be cooled efficiently, and the solidification time of the hot melt can be shortened.

[0128] Furthermore, in order to shorten the working time and to provide a stable void 58, the process of processing the deformed portion 55 and the process of attaching the fixing member 65 may be made independent. By shortening the working time for each step, the manufacturing capacity of the zippered paper container 90 can be improved. In addition, since the temperature (heating, cooling) of the molding jig 66 can be set to suit each step, the void 58 can be formed into a more appropriate shape and that shape can be maintained for a long period of time.

[0129] <Forming and filling of resealable paper containers> The upper overlapping plate 34, which stands upright, is folded and laid down on the back side (back top plate 33a side), and the top protrusions 74 that protrude on both the left and right sides are folded in the direction of the side plates 32 and joined to the body 72. At this time, the bent portion 76 of the top protruding portion 74 is bent. In order to ensure that the bending of the bent portion 76 is carried out properly, an auxiliary member may be brought into contact with the vicinity (including contact) of the bent portion 76 from the inside and / or outside of the top portion 71.

[0130] The method by which the top projection 74 is joined to the body 72 may include using an adhesive (such as hot melt), using adhesive tape, or using a mechanical joining method (such as an engaging method or using a fastener). Furthermore, if the outermost layer of the blank plate 10 is provided with a thermoplastic resin layer (sealant layer), the thermoplastic resin layer (sealant layer) may be heat-sealed. Similar methods are used for joining the bottom projection, which will be described later.

[0131] The bottom 73 of the third intermediate stage resealable paper container 95, formed as described above, is turned upward, and the contents are filled in through the opening of the bottom 73. Then, the bottom 73 is folded, and the bottom sealing edges 37 are heat-sealed together in a gusset-like manner.

[0132] Subsequently, the joined bottom seal portion 37 is folded and laid flat on the back side (back bottom plate 35a side), and the protruding bottom portions on both the left and right sides are folded and joined to the bottom plate 35 side, thereby completing the packaging body of the roughly rectangular parallelepiped paper container 90 with a zipper.

[0133] Figure 5 is a perspective view showing the resealable paper container 90 according to this embodiment. Figure 6 is a side view of the resealable paper container 90 shown in Figure 5. Figure 7 is a top view of the resealable paper container 90 shown in Figure 5.

[0134] The resealable paper container 90 shown in Figure 5 has an outer shape that is roughly rectangular and has edges 72d on its body 72. Furthermore, since the resealable paper container 90 is made of a flexible laminated sheet 78 primarily composed of paper, it does not have a perfect rectangular prism shape, and is therefore described as having a roughly rectangular prism shape.

[0135] <Opening mechanism for removing contents from a resealable paper container> This section describes the procedure for opening the top 71 of the completed resealable paper container 90 containing the contents in order to remove the contents. First, the top projection 74, which is attached to the body 72, is detached. Then, as the top projection 74 is lifted upward, the top side plate 41 stands upright, and the upper overlapping plate 34 also stands upright accordingly. The top side plate 41 and the upper overlapping plate 34 then form almost the same plane.

[0136] Then, the user grasps the opening grips 57 on both the front and back sides with their fingers and spreads the front blank plate 10b and the back blank plate 10a outwards (front-to-back direction) to peel off the easy-open seal portion 53. This completes the initial opening of the resealable paper container 90. At this time, since a gap 58 is provided in the upper edge portion 21, it is easy for the user to insert their fingers, and therefore easy to grasp the opening grips 57.

[0137] Next, after the initial opening of the resealable paper container 90, the reseal tape 61 is opened. Here, the area between the upper edge 21b on the front and the front reseal tape 61b is defined as the opening grip allowance 571b after the initial opening on the front. Similarly, the area between the upper edge 21a on the back and the back reseal tape 61b is defined as the opening grip allowance 571a after the initial opening on the back. The opening grip allowance 571 after the initial opening includes the opening grip allowance 57, the easy-open seal portion 53, and the area between the reseal tape 61 and the easy-open seal portion 53. (See Figure 12B).

[0138] The user grasps the opening gripping tabs 571 on both sides after initial opening and spreads the zippered paper container 90 outwards (front-to-back direction). Doing so separates the zipper tapes 61 provided on the upper overlapping plate 34 and the left and right side plates 41 at the top.

[0139] During the opening operation of the chuck tape 61, the ends of the chuck tape 61 on both the left and right side edges 11 of the blank plate 10 open up to approximately the entire width of the respective side edge seal allowance 36. Note that the side edge seal allowance 36 does not peel off. As described above, the male zipper tape 61m and the female zipper tape 61f of the zipper tape 61 separate to form the opening 56 for removal. Figure 9 shows a zippered paper container 94 with the top 71 open.

[0140] The peeling operation of the easy-open seal portion 53 and the detachment operation of the zipper tape 61 may be performed in a single operation. Alternatively, the detachment operation of the zipper tape 61 may be performed after the peeling operation of the easy-open seal portion 53 is completed.

[0141] <Second aspect of the first embodiment> Figure 13A is an end view of the upper edge 21 of the zippered paper container 93 with the top projection 74 raised, as observed from the direction of arrow B shown in Figure 8. Although Figure 8 is a drawing of the first embodiment of the first design, it is used here by analogy for explanatory purposes. The explanation of arrow B will be the same for other designs and other designs.

[0142] The front deformation portion 55b and the back deformation portion 55a are shorter in the width direction than the front deformation portion 55b and the back deformation portion 55a of the first aspect of the first embodiment. The deformation portion 55 only needs to be large enough for a finger to grip, and its width should be 15 mm or more, and may be 50 mm or less. More preferably, it should be 20 mm or more and 40 mm or less. By doing so, the pressing force required to process the deformation portion 55 is reduced, making processing easier. In addition, the amount of hot melt used is reduced, thus lowering costs.

[0143] The shape of the resealable paper container 90, other than the shape of the deformed portion 55, is the same as in the first aspect of the first embodiment. Also, the shape of the blank plate 10, the layer configuration of the laminated sheet 78, the manufacturing method of the resealable paper container 90, and the filling method of the resealable paper container 90 are the same as in the first aspect of the first embodiment.

[0144] <Third aspect of the first embodiment> Figure 13B is an end view of the upper edge 21 of the zippered paper container 93 with the top protrusion 74 of this embodiment raised, as observed from the direction of arrow B shown in Figure 8. A deformed portion 55b is present on the front side, but no deformed portion 55a is present on the back side.

[0145] In this embodiment, the deformation portion 55 is formed on the front blank plate 10b, making processing easier. Also, the amount of hot melt used is reduced, thus lowering costs. In this embodiment, only the front deformation portion 55b is formed, but only the back deformation portion 55a may also be formed.

[0146] The shape of the resealable paper container 90, other than the shape of the deformed portion 55, is the same as in the first aspect of the first embodiment. Also, the shape of the blank plate 10, the layer configuration of the laminated sheet 78, the manufacturing method of the resealable paper container 90, and the filling method of the resealable paper container 90 are the same as in the first aspect of the first embodiment.

[0147] <Fourth aspect of the first embodiment> Figure 13C is an end view of the upper edge 21 of the zippered paper container 93 with the top protrusion 74 of this embodiment raised, as observed from the direction of arrow B shown in Figure 8. The front deformation portion 55b is present, but the back deformation portion 55a is not.

[0148] Furthermore, the surface deformation portion 55b is shorter in the width direction than the surface deformation portion 55b of the third aspect of the first embodiment. The surface deformation portion 55b only needs to be large enough for a finger to grip, and its width should be 15 mm or more, and may be 50 mm or less. More preferably, it should be 20 mm or more and 40 mm or less. By doing so, the pressing force required to process the deformation portion 55 is reduced, making processing easier. Also, the amount of hot melt used is reduced, thus lowering costs. In this embodiment, only the front deformation portion 55b is formed, but it is also possible to form only the back deformation portion 55a.

[0149] The shape of the resealable paper container 90, other than the shape of the deformed portion 55, is the same as in the first aspect of the first embodiment. Also, the shape of the blank plate 10, the layer configuration of the laminated sheet 78, the manufacturing method of the resealable paper container 90, and the filling method of the resealable paper container 90 are the same as in the first aspect of the first embodiment.

[0150] <Second Embodiment> The blank plates 10 of the zippered paper container 90 of this embodiment are shown in Figures 16A and 16B. Figure 16A shows the back blank plate 10a, and Figure 16B shows the front blank plate 10b.

[0151] Below the upper edge 21b of the front blank plate 10b, there is a front gap auxiliary line 59b that extends in the horizontal direction. The length of the front gap auxiliary line 59b may be between the two front second vertical folding lines 13b, and it does not have to intersect with the front second vertical folding lines 13b. Furthermore, the front gap auxiliary line 59b may be a single line, multiple lines, a dashed line, etc.

[0152] The surface gap auxiliary line 59b may be a creasing line with a bending function, or it may have the same properties as the other creasing lines on the surface blank plate 10b, in which case it may be processed at the same time as the other creasing lines. The elements other than the surface gap auxiliary line 59b are the same as in the first aspect of the first embodiment.

[0153] The back-side void guide line 59a is provided on the back-side blank plate 10a, and its shape may be the same as (symmetrical with respect to) the front-side void guide line 59b. Alternatively, the front-side void guide line 59b and the back-side void guide line 59a may have different shapes. Furthermore, both the front-side void guide line 59b and the back-side void guide line 59a may be present, or only one of them may exist.

[0154] Figure 17 shows the first intermediate stage of the zippered paper container 91, which is an intermediate stage in the manufacturing of the zippered paper container 90 using the blank plate 10 shown in Figures 16A and 16B. The top is the upper edge 21b of the front blank plate 10b shown in Figure 16B, and the back blank plate 10a is provided on the back side. The back blank plate 10a is not visible to the naked eye, but when viewed through, it has the same shape as the front blank plate 10b. Subsequently, a resealable paper container 90 is manufactured using the same procedure as in the first embodiment of the first model.

[0155] Figure 18A is a plan view of the upper edge 21 of the zippered paper container 93 with the top projection 74 of this embodiment raised, as observed from the direction of arrow B shown in Figure 8.

[0156] The deformable portion 55 has both a front deformable portion 55b and a back deformable portion 55a. The method for expanding the deformable portion 55 outwards (front and back) is the same as in the first embodiment of the first model. In this case, the lower edge of the deformable portion 55 is formed by folding the gap guide line 59 in a valley fold when viewed from the outside. Then, a fixing member 65 is formed on the outside (upper layer) of the folded gap guide line 59 using hot melt from the outside. In Figure 18A, the front gap guide line 59b and the back gap guide line 59a are shown, but when the fold of the gap guide line 59 is small, they may not be clearly visible. Also, the fixing member 65 is obscured by the deformable portion 55 and therefore cannot be seen. However, depending on the size relationship between the fixing member 65 and the deformable portion 55, the fixing member 65 may be visible.

[0157] Figure 18B is a cross-sectional view at the cross-sectional position RR shown in Figure 18A. The upper overlapping plate 34 is bent outward along the gap guide line 59 and deformed in the outward direction, forming a deformed portion 55. A gap 58 is provided between the front upper edge portion 21b and the back upper edge portion 21b. A fixing member 65 is provided on the outside of the gap guide line 59.

[0158] Figure 19A is a front view of the upper overlapping front plate 34b as seen from the front. The front fixing member 65b is a straight line in the horizontal direction, and the front gap auxiliary line 59b, which is approximately the same length as the front fixing member 65b, is located below (inside) the front fixing member 65b. The front fixing member 65b may be shorter than the front gap guide line 59b, in which case the front gap guide line 59b can be seen from the outside. Alternatively, the front fixing member 65b may be longer than the front gap guide line 59b.

[0159] Figure 19B shows another shape of the front fixing member 65b. The front fixing member 65b is provided in the shape of a dashed line, and the other components are the same as in Figure 19A. In this embodiment, the surface gap guideline 59b is shown as a single line or a dashed line, but it may also be a dotted line, a series of short vertical lines connected horizontally, or a circle, as long as it has the function of maintaining the folded shape of the gap guideline 59.

[0160] The shape of the zippered paper container 90 is the same as in the first embodiment, except that it is equipped with a gap guide line 59. Also, the shape of the blank plate 10, the layer configuration of the laminated sheet 78, the method of manufacturing the zippered paper container 90, and the method of filling the zippered paper container 90 are the same as in the first embodiment.

[0161] <First aspect of the third embodiment> Figure 20A is a plan view of the upper edge 21 of the zippered paper container 93 with the top projection 74 raised, as observed from the direction of arrow B shown in Figure 8. Figure 20A shows that a front fixing member 65b is provided on the inside of the front deformation portion 55b, and a back fixing member 65a is provided on the inside of the back deformation portion 55a. Each fixing member 65 is a straight line extending in the lateral direction and is in contact with each other on its inside.

[0162] Figure 20B is a cross-sectional view at the cross-sectional position SS shown in Figure 20A. A fixing member 65 is provided as hot melt adhesive at the lower edge, i.e., the bent portion, of the deformable portion 55 provided on the upper overlapping plate 34. The front fixing member 65b and the back fixing member 65a are in contact on the inside. In this embodiment, in addition to the fixing member 65 maintaining the shape of the deformed portion 55 over time, the gap portion 58 is stably held by the contact between the front fixing member 65b and the back fixing member 65a.

[0163] <Second aspect of the third embodiment> In Figure 21A, both the front fixing member 65b and the back fixing member 65a are provided in a dashed line shape and are positioned opposite each other. Except for the shape of the fixing member 65, it is the same as the first embodiment of the third embodiment. The operation of this embodiment is also the same as the first embodiment of the third embodiment, but the amount of fixing member can be reduced.

[0164] <Third aspect of the third embodiment> In Figure 21B, both the front fixing member 65b and the back fixing member 65a consist of multiple divided lines and are positioned so as not to overlap with each other. Except for the shape of the fixing member 65, it is the same as in the first embodiment of this model. In this embodiment, the front fixing member 65b and the back deformation portion 55a are not in contact, and the back fixing member 65a and the front deformation portion 55b are not in contact. However, the front fixing member 65b and the back deformation portion 55a may be in contact, and the back fixing member 65a and the front deformation portion 55b may be in contact. Except for the shape of the fixing member 65, this embodiment is the same as the first embodiment. The function of this embodiment is also to hold the gap 58, but the amount of fixing member 65 can be reduced.

[0165] <Fourth aspect of the third embodiment> In Figure 21C, a front fixing member 65b is provided on the inside of the front deformation portion 55b, but the back deformation portion 55a and the back fixing member 65a are not provided. Thus, only the front side may be processed, or only the back side may be processed. Since only one side is processed, the processing work is simplified. Except for the shape of the deformation portion 55 and the fixing member 65, it is the same as the first embodiment of this model. The function of this embodiment is also to maintain the gap portion 58, but the amount of fixing member 65 can be reduced.

[0166] <Fourth Embodiment> This embodiment is a zippered paper container 90 formed from a blank plate 10 similar to the second embodiment, which has a gap guideline 59, as shown in Figures 16A and 16B. Figure 22A is a plan view of the upper edge 21 of the zippered paper container 93 of this embodiment, with the top projection 74 raised, as observed from the direction of arrow B shown in Figure 8. Figure 20B is a cross-sectional view of the cross-sectional position UU shown in Figure 22A.

[0167] A gap guide line 59 is provided at the lower edge of the deformed portion 55 on the upper overlapping plate 34, and a fixing member 65 is provided as a hot melt on the inside of the gap guide line 59. The front fixing member 65b and the back fixing member 65a are in contact on the inside. The difference from the second embodiment is the presence of the gap guide line 59. Other embodiments of the deformable portion 55 may be the same as those of the second, third, and fourth embodiments of the first embodiment. Similarly, other embodiments of the fixing member 65 may be the same as those of the second, third, and fourth embodiments of the third embodiment. [Examples]

[0168] The embodiments of this disclosure will be described in more detail below with reference to examples.

[0169] <Example 1> In Example 1, a paper container with a zipper 90, as shown in Figure 5, was manufactured using the blank plate 10 shown in Figures 1A and 1B, which corresponds to the first aspect of the first embodiment.

[0170] Two blank plates 10, as shown in Figures 1A and 1B, were prepared and placed on top of each other with their inner surfaces aligned. As shown in Figure 2, the sealing margins 36 on both opposing side edges were heat-sealed, and the easy-open sealing portion 53 was also heat-sealed. The zipper tape 61 was also heat-sealed. In this way, a first intermediate stage zippered paper container 91 was produced, with the bottom sealing margin 37 being unsealed.

[0171] The laminated sheet 78 of the blank plate 10 had the following configuration. Figure 10D shows a cross-sectional view of the laminated sheet 78, but the printed pattern layer and the easily peelable section 54 are not shown. Note that " / " indicates the boundary between adjacent layers. (Outside) Image / design printing layer (gravure printing on the outer surface of paper substrate 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 12μm, Dai Nippon Printing) IB-PET-UBP) / The innermost thermoplastic resin layer is 783 (LDPE 40μm, made by Nippon Polyethylene). LC520) (Inside)

[0172] The manufacturing method for the laminated sheet 78 described above will now be explained. First, a roll-shaped paper base material layer 782 is unwound, a predetermined pattern or character is gravure printed at a predetermined position, and then it is wound up into a roll again.

[0173] In the next step, the roll-shaped paper substrate layer 782 described above was unwound, and a barrier layer 785 (silica-deposited PET 12 μm) was laminated to 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 in between.

[0174] Next, the innermost thermoplastic resin layer 783 (LDPE 40 μm) was formed on the opposite side (inner surface) of the paper substrate layer 782 of the barrier layer 785 by extrusion lamination, and the material was wound up into a roll again.

[0175] Furthermore, to improve the bonding strength between each bonding layer, anchor coating, corona treatment, flame treatment, etc. may be performed as needed. Alternatively, the molten resin may be treated with ozone.

[0176] Next, the roll-shaped laminated sheet 78 is unwound, and an easy-peel section 54 is provided on a predetermined location on the inner surface of the innermost thermoplastic resin layer 783 by gravure printing, and then it is wound up into a roll again. In this embodiment, the paper base material layer 782 is printed with a pattern or the like beforehand in a single layer state. However, the pattern or the like may be printed on the surface of the laminated sheet 78 after it has been completed.

[0177] Next, the rolled laminated sheet 78 was unwound, and after scribing and die-cutting processes, the blank plate 10 was completed.

[0178] The zipper tape 61, which is heat-sealed and attached to the inner surface of the upper overlapping plate 34 and the top side plate 41 of the zippered paper container 90, has a two-layer structure for the heat-sealed zipper tape body 62, for both the male zipper tape 61m and the female zipper tape 61f. The zipper tape 61 has a resin layer made of LLDPE on the side that is heat-sealed to the zippered paper container 90, and a resin layer made of MDPE on the opposite side. 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 portion 62 has a width of 7 mm in both cases.

[0179] The dimensions of the back blank plate 10a and the front blank plate 10b are rectangular, measuring 250 mm in length and 189 mm in width. A 7 mm wide side edge seal allowance 36 is provided on both side edges 11 as a seal allowance around the edges. Additionally, a 10 mm wide bottom seal allowance 37 is provided on each of the bottom edges 26.

[0180] Furthermore, an opening gripping area 57 with a vertical length (short side direction) of 10 mm is provided on the upper edge 21 of the upper overlapping plate 34 and the top side plate 41, and below the opening gripping area 57, an easy-open seal area 53 with a vertical length (short side direction) of 3 mm is provided. The easy-open seal area 53 is sealed in the area of ​​the easy-peel processed area 54, except for the side edge seal area 36 and the vicinity of the side edge seal area 36.

[0181] On the blank plate 10, the upper overlapping plate 34, the first horizontal fold line 22, the top plate 33, the second horizontal fold line 23, the wall plate 31, the third horizontal fold line 24, and the bottom plate 35 are provided in this order, starting from the upper edge 21 and moving downwards.

[0182] Furthermore, side panels 41 of the top section are provided on the outer sides of both sides of the upper overlapping panel 34 via second vertical folding lines 13. In addition, top section projections 38 are provided on the outer sides of both sides of the top panel 33 via second vertical folding lines 13. Also, side panels 32 are provided on the outer sides of both sides of the wall panel 31 via second vertical folding lines 13. Furthermore, bottom section projections 43 are provided on the outer sides of both sides of the bottom panel 35 via second vertical folding lines 13.

[0183] Furthermore, below the easy-open seal portion 53, the zipper tape 61 was heat-sealed in a direction that crosses the top portion 71 on the inner surfaces of the upper overlapping plate 34 and the top side plate 41. Here, the distance between the upper edge portion 21 and the center of the zipper tape 61 was 23 mm. The distance between the center of the zipper tape 61 and the first horizontal fold line 22 was 15 mm. As described above, the first intermediate stage zippered paper container 91 was manufactured.

[0184] Next, the mandrel is inserted into the unsealed bottom sealing area 37 of the zippered paper container 91 in this first intermediate stage, leaving the upper overlapping plate 34 intact, and the top plate 33 below it is spread forward and backward along the first horizontal folding line 22, causing the upper overlapping plate 34 to stand upright. Below the upper overlapping plate 34, a top section 71 made of a top plate 33 is formed, followed by a body section 72 with a roughly rectangular horizontal cross-section (a plane roughly parallel to the bottom surface), and a second intermediate stage zippered paper container 92 is formed with a roughly rectangular bottom opening 73. (See Figure 3).

[0185] Next, a deformed portion 55 was processed into the upper overlapping plate 34, and a fixing member 65 was provided, thereby forming a gap portion 58. First, as shown in Figure 14A, a pair of suction cups 67 were pressed against the outer surfaces of the front and back upper overlapping plates 34. Subsequently, the suction cups 67 became negative pressure, causing the suction cups 67 to adhere closely to the upper overlapping plates 34, and the pair of suction cups 67 moved outward and separated. Then, as shown in Figure 14B, the upper front edge portion 21b of the front upper overlapping plate 34b and the upper back edge portion 21a of the back upper overlapping plate 34a separated.

[0186] Next, as shown in Figure 14C, the inner forming jig 661 was inserted into the gap between the upper edge portion 21a on the front side and the upper edge portion 21b on the back side. Then, as shown in Figure 14D, the upper overlapping plate 34 was sandwiched between a pair of outer forming jigs 662 from the outside of the front and back sides, and the inner forming jig 661 and the outer forming jig 662 were held in a predetermined position with a predetermined distance between them.

[0187] In this case, the front upper overlapping plate 34b was sandwiched between the outer forming jig 662 and the inner forming jig 661 located on the front side. Similarly, the back upper overlapping plate 34a was sandwiched between the outer forming jig 662 and the inner forming jig 661 located on the back side.

[0188] Although a method for processing the front deformation portion 55b and the back deformation portion 55a simultaneously has been described here, the front deformation portion 55b and the back deformation portion 55a may be processed in separate processes.

[0189] In this embodiment, the molding jig 66 was made of stainless steel (JIS SUS304), and a heating function, such as an electric heater, was provided on the molding jig 66 and heated to 70°C. However, depending on the processing conditions, heating of the molding jig 66 may not be necessary, in which case the molding jig 66 does not need to be equipped with a heating function. Alternatively, the molding jig 66 may not be equipped with a heating function, and the area where the deformed portion 55 of the upper overlapping plate 34 is formed, and / or the molding jig 66 itself, may be heated from the outside using a hot air generating device.

[0190] Next, the pair of outer forming jigs 662 moved outward from the upper overlapping plate 34, but the inner forming jig 661 remained in the same position. Subsequently, as shown in Figure 14F, hot melt was applied from the outside to the bent portion of the upper overlapping plate 34 to form the fixing member 65. At this time, the inner forming jig 661 remained inserted into the upper overlapping plate 34 while the hot melt was applied, so the position of the upper overlapping plate 34 was fixed, and the application position of the hot melt was accurate.

[0191] Then, the overlapping upper overlapping plates 34 were folded towards the back top plate 33a. After that, the top projections 74, which were connected to both the left and right sides of the top section 71, were joined to the body section 72. Hot melt adhesive was used for this joining. Furthermore, the tip of the top protrusion 74 is folded inwards towards the inside of the zippered paper container 90 (downwards before the top protrusion 74 is folded) to facilitate joining the top protrusion 74 to the body 72.

[0192] When joining the top projection 74 to the body 72, the angle between the top 71 and the top projection 74, via the bent portion 76 of the top projection 74, was made approximately a right angle.

[0193] The finished paper container was formed to have dimensions of approximately rectangular prism shape, with a width of 95 mm, a height of 120 mm, and a depth of 80 mm. The vertical length (height) of the deformable section 55 was 5 mm, the horizontal length (width) was 75 mm, and the width of the hot melt fixing member 65 was 1.2 mm. As described above, the resealable paper container 90 of this embodiment was manufactured.

[0194] <Example 2> In this embodiment, a zippered paper container 90 was manufactured, which corresponds to the second aspect of the first embodiment and is provided with the void portion 58 shown in Figure 13A. The void portion 58 in this embodiment is shorter in length laterally than that in Embodiment 1, and a molding jig 66 was prepared to form its deformed portion 55.

[0195] The vertical length (height) of the deformed portion 55 was 5 mm, the horizontal length (width) was 30 mm, and the width of the hot melt fixing member 65 was 1.2 mm. The shape of the blank plate 10, the layer configuration of the laminated sheet 78, and the method of manufacturing the zippered paper container 90 were the same as in Example 1.

[0196] <Example 3> In this embodiment, a zippered paper container 90 was manufactured, which corresponds to the third aspect of the first embodiment and is provided with the void portion 58 shown in Figure 13B. In this embodiment, only the surface deformation portion 55b of the void portion 58 was processed, and a molding jig 66 was prepared to form the deformation portion 55.

[0197] The vertical length (height) of the deformed surface portion 55b was 5 mm, the horizontal length (width) was 75 mm, and the width of the hot melt fixing member 65 was 1.5 mm. The shape of the blank plate 10, the layer configuration of the laminated sheet 78, and the method of manufacturing the zippered paper container 90 were the same as in Example 1.

[0198] <Example 4> In this embodiment, a zippered paper container 90 was manufactured that had a void portion 58 as shown in Figure 13C, which corresponds to the fourth aspect of the first embodiment. In this embodiment, only the surface deformation portion 55b of the void portion 58 was processed, and a molding jig 66 was prepared to form the deformation portion 55.

[0199] The vertical length (height) of the deformed surface portion 55b was 5 mm, the horizontal length (width) was 30 mm, and the width of the hot melt fixing member 65 was 1.5 mm. The shape of the blank plate 10, the layer configuration of the laminated sheet 78, and the method of manufacturing the zippered paper container 90 were the same as in Example 1.

[0200] <Example 5> In this embodiment, a zippered paper container 90 was manufactured using the blank plate 10 shown in Figures 16A and 16B, which corresponds to the second embodiment, and the upper overlapping plate 34 shown in Figures 18A, 18B, and 19A was formed on it. In this embodiment, gap guide lines 59 are provided on both the front and back sides of the blank plate 10. Aside from the presence of gap guide lines 59 on the blank plate 10, the shape of the blank plate 10, the layer configuration of the laminated sheet 78, and the manufacturing method of the zippered paper container 90 were the same as in Embodiment 1.

[0201] <Example 6> In this embodiment, a zippered paper container 90 was manufactured, which has an upper overlapping plate 34 formed on it, as shown in Figures 20A and 20B, corresponding to the first aspect of the third embodiment. In this embodiment, the front fixing member 65b and the back fixing member 65a were provided on the inside of the upper overlapping plate 34 of the blank plate 10 on both the front and back sides. Except for the fact that the fixing members 65 are located on the inside of the upper overlapping plate 34 of the blank plate 10, the shape of the blank plate 10, the layer configuration of the laminated sheet 78, and the manufacturing method of the zippered paper container 90 were the same as in Embodiment 5.

[0202] <Example 7> In this embodiment, a zippered paper container 90 was manufactured, which has an upper overlapping plate 34 formed on it, corresponding to the second aspect of the third embodiment as shown in Figure 21A. In this embodiment, the front fixing member 65b and the back fixing member 65a were provided on the inside of the upper overlapping plate 34 of the blank plate 10 on both the front and back sides. Except for the shape of the fixing member 65 which differed from that of Embodiment 6, the shape of the blank plate 10, the layer configuration of the laminated sheet 78, and the manufacturing method of the zippered paper container 90 were the same as in Embodiment 6.

[0203] <Example 8> In this embodiment, a zippered paper container 90 was manufactured, which has an upper overlapping plate 34 formed on it, as shown in Figure 21B, corresponding to the third aspect of the third embodiment. In this embodiment, the front fixing member 65b and the back fixing member 65a were provided on the inside of the upper overlapping plate 34 of the blank plate 10 on both the front and back sides. Except for the shape of the fixing member 65 which differed from that of Embodiment 6, the shape of the blank plate 10, the layer configuration of the laminated sheet 78, and the manufacturing method of the zippered paper container 90 were the same as in Embodiment 6.

[0204] <Example 9> In this embodiment, a zippered paper container 90 was manufactured, which has an upper overlapping plate 34 formed on it, as shown in Figure 21C, corresponding to the fourth aspect of the third embodiment. In this embodiment, a front deformation portion 55b and a front fixing member 65b are provided on the inside of the front deformation portion 55b, but a back deformation portion 55a and a back fixing member 65a are not provided. Also, a front gap guide line 59b is provided, but a back gap guide line 59a is not provided. The processing method for the front deformation portion 55b was the same as in Embodiment 3, and the shape of the blank plate 10 in other parts, the layer configuration of the laminated sheet 78, the processing method for the front fixing member 65, and the manufacturing method of the zippered paper container 90 were the same as in Embodiment 6.

[0205] <Comparative Example> In the comparative example, a resealable paper container 80, as shown in Figure 23, was manufactured. The outer shape and fold lines of the blank plate 81 were the same as in Example 1, and the outer dimensions of the completed resealable paper container 80 were approximately the same as in Example 1. However, the initial opening method differed: in Example 1, the method involved peeling off the easy-open seal portion 53, while in the comparative example, the method involved cutting off the easy-open processing line 851. The layer configuration of the laminated sheet of the blank plate 81 was the same as in Example 1.

[0206] <Rating> Fifty samples each were prepared for Examples 1 through 9 and the comparative example. The samples were filled with snack food.

[0207] In the samples of Examples 1 to 9, the user grasped the front opening gripping area 57b between the front upper edge 21b and the easy-open seal area 53, and the back opening gripping area 57a between the back upper edge 21a and the easy-open seal area 53, respectively, with their fingers and spread the resealable paper container 90 outward (front-to-back direction).

[0208] At that time, the user was able to insert their fingers into the gap 58 and firmly grasp the opening grip 57, so they were able to easily peel off the easy-open seal 53. Then, the resealable paper container 90 was initially opened.

[0209] After the initial opening of the resealable paper container 90, the resealable tape 61 was opened. Here, the area between the upper edge 21b on the front and the front resealable tape 61b is called the front initial opening gripping area 571b. Similarly, the area between the upper edge 21a on the back and the back resealable tape 61b is called the back initial opening gripping area 571a. The user grasped the front and back initial opening gripping areas 571 with their fingers and spread them outwards (front-to-back direction) of the resealable paper container 90. By doing so, the resealable tapes 61 provided on the upper overlapping plate 34 and the left and right top side plates 41 could be easily separated.

[0210] In the comparative example, the resealable paper container 80, the portion including the top seal could be cut off by the notch provided on the top side panel as a means of initial opening, and the easy-open processing line 851 provided on the top overlapping panel and the top side panel. Next, the user 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 661 fingers and attempted to spread the zippered paper container 80 outwards.

[0211] In the comparative example, the resealable paper container 80, there was no gap, making it difficult to insert fingers between the front opening gripping area 857b and the back opening gripping area 857a. To open it, users had to pry it open by inserting their fingernails between the front opening gripping area 857b and the back opening gripping area 857a, or by inserting a flat tool, which sometimes required time to separate the resealable tape 861.

[0212] Furthermore, the packaging of the resealable paper containers 90 with zippers in Examples 1 to 9, in which the zipper tape 61 was detached as described above, was tested for its suitability for removing contents and its ability to be resealed with the zipper.

[0213] The fitting of the chuck tape 61 was easily detached, and the upper part of the paper container 90 with a chuck was opened over substantially the entire width, forming the take-out opening 56. Through the take-out opening 56, the snack filled inside could be easily taken out.

[0214] Also, after a part of the contents was taken out, the package of the paper container 90 with a chuck in Examples 1 to 9 was easily re-fitted with the chuck tape 61 and re-sealed. And the remaining contents were properly stored.

[0215] Furthermore, in the paper container 90 with a chuck of the present disclosure, the mass ratio of the paper to the total mass of the paper container 90 with a chuck sufficiently satisfied 51% by mass or more, which is the standard as a paper container.

Explanation of Signs

[0216] 10 Blank plate 10a Back blank plate 10b Front blank plate 11 Side edge part 12 First longitudinal folding line 13 Second longitudinal folding line 15 Top side protruding part folding line 17 Top side diagonal folding line 18 Bottom side diagonal folding line 21 Upper edge part 22 First transverse folding line 23 Second transverse folding line 24 Third transverse folding line 25 Fourth transverse folding line 26 Lower edge part 31 Wall panel 32 Side panel 33 Top panel 34 Upper overlapping plate 35 Bottom panel 36 Side edge part seal margin 37 Bottom side seal margin 38 Top side protruding part margin 41 Top side side plate 43 Bottom side protruding part margin 45-day top flap 52 chuck tape joint 53 easy-open seal part 54 easy-peel processing part 55 deformation part 56 extraction opening 57 opening grip margin 571 opening grip margin after initial opening 58 void part 59 void auxiliary line 61 chuck tape 62 chuck tape body part 63 chuck tape fitting part 65 fixing member 66 forming jig 661 inner forming jig 662 outer forming jig 67 suction cup 71 top part of paper container with chuck 72 body part of paper container with chuck 72d ridge part of the body 73 bottom part of paper container with chuck 74 top-side protrusion 76 bending part of the top-side protrusion 78 laminated sheet 781 outermost thermoplastic resin layer 782 paper base material layer 783 innermost thermoplastic resin layer 784 intermediate adhesive layer 785 barrier layer 80 conventional paper container with chuck 831 wall panel 851 easy-open processing line [[ID=६7]]856 extraction opening 857 opening grip margin 861 chuck tape 871 top part 874 top-side protrusion 90 paper container with chuck of the present disclosure 91 paper container with chuck at the first intermediate stage 92 paper container with chuck at the second intermediate stage 93. A resealable paper container with a protruding top section. 94. Paper container with a zipper and an open top. 95. Paper container with zipper, third intermediate stage. 96 paper containers B. Observation direction of the upper edge of the resealable paper container (indicated by arrows in the diagram) C. Cutting position in the enlarged cross-sectional view of the chuck tape joint. E. First celestial intersection (the intersection of the first vertical fold line and the first horizontal fold line) F. Second celestial intersection (the 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) P Cutting position of the top flap Q: Cutting position of the top flap R Top flap cutting position S Cutting position of the top flap T Top flap and cutting position of the molding jig Cutting position of the U-shaped top flap

Claims

1. In a paper container assembled from a blank plate consisting of a laminated sheet including a paper base layer, The blank plate includes at least a front blank plate and a back blank plate, The paper container has a top section consisting of an upper overlapping plate formed by overlapping and joining the front blank plate and the back blank plate, and a top plate connected to the bottom of the upper overlapping plate. The top side panels are connected to both the left and right sides of the aforementioned upper overlapping plate, The top part has protruding parts on both the left and right sides, The torso is located below the aforementioned top part, The bottom portion located below the torso, The upper overlapping plate and the upper edge of the top side plate are provided with an opening gripping area, It is provided with an easy-open seal portion located below the opening grip portion, which crosses the upper overlapping plate and the top side plate, The upper overlapping plate and / or the side plate of the top part are provided with fixing members. The fixing member is provided to hold the opening gripping portion in a state where it is folded outwards. A paper container having a gap between the front blank plate and the back blank plate at the upper edge.

2. The paper container according to claim 1, wherein the fixing member is spaced apart from the upper edge.

3. The paper container according to claim 1, wherein the fixing member extends laterally.

4. The aforementioned fixing members are scattered in the lateral direction, as described in claim 1 of the paper container.

5. The paper container according to claim 1, further comprising a gap auxiliary line which is a crease line having a folding function that contacts the fixing member.

6. The paper container according to claim 1, wherein the fixing member is provided at least on the outside of the front blank plate and / or the outside of the back blank plate.

7. The paper container according to claim 1, wherein the fixing member is provided at least on the inside of the front blank plate and / or on the inside of the back blank plate.

8. A paper container according to claim 1, wherein a zippered paper container is provided with a zipper tape extending laterally on the upper overlapping plate and the top side plate below the easy-open seal portion.

Images