JP2022131914A - Zippered paper container - Google Patents

Abstract

To provide a zippered paper container in which damage (cracking) is less likely to occur in a folded portion of a top side protruding part interposed between a top part and the top side protruding part, when the top side protruding part is folded in a direction of the body of the zippered paper container and joined to the body.SOLUTION: In a zippered paper container in which a blank plate composed of a laminated sheet 78 including a paper base layer 782 is assembled, the blank plate includes at least a front side blank plate and a back side blank plate, and at least the laminated sheet 78 of the front side blank plate has a paper base protection layer 788 on one of outer side layers of the paper base layer 782.SELECTED DRAWING: Figure 13A

Description

The present disclosure relates to a paper container with a zipper, particularly in the field of paper containers having a three-dimensional shape and being self-supporting. The present invention relates to a zippered paper container capable of retaining its properties.

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

The above technology can protect the contents and prevent the contents from spilling when the paper container is overturned. Moreover, since it is a paper container, it is easy to reduce the volume of the container after the contents are consumed and to dispose of the container easily. FIG. 1 shows a blank plate 81 used for manufacturing a conventional paper container 80 with a zipper, FIG. 2 shows a perspective view of the conventional paper container 80 with a zipper, and FIG. 3 shows a plan view.
An easy-to-open processing line 851 for opening the top portion 871 of the paper container 80 with a zipper sequentially from the upper edge of the paper container 80 with a zipper, and a zipper tape 861 capable of freely opening and closing the top portion 871 of the paper container 80 with a zipper that has been opened. There is

Unless otherwise specified, referring to FIG. , upper side and lower side. The same applies to the zippered paper container 90 of the present disclosure.
Also, the reference numerals used when describing the prior art are 80s or 800s to distinguish them from the present disclosure.

The laminated sheet 88 of the blank plate 81 has a paper base layer and a synthetic resin layer on at least the back surface thereof. Further, these synthetic resin layers may be a single layer or multiple layers.

As an example, a laminate sheet 88 having a three-layer configuration is shown in FIG. 5A. The layer structure is as follows.
(Surface) Outermost thermoplastic resin layer 881 / paper base layer 882 /
Innermost thermoplastic resin layer 883 (back side)

Also, as an example, a laminate sheet 88 having a two-layer structure is shown in FIG. 5B. The layer structure is as follows.
(Front side) Paper base layer 882 / Innermost thermoplastic resin layer 883 (Back side)
This is a layer configuration in which the outermost thermoplastic resin layer 781 is removed from the three-layer blank plate 10 shown in FIG. 5A.

Moreover, a barrier layer 885 can be provided when the laminated sheet 88 requires barrier properties (water vapor, oxygen, fragrance retention, etc.). FIG. 5C is a cross-sectional view of a laminate sheet 88 consisting of five layers, the layer structure of which is as follows.
(Front Side) Outermost Thermoplastic Resin Layer 881/Paper Base Layer 882/Intermediate Adhesive Layer 884/Barrier Layer 885/Innermost Thermoplastic Resin Layer 883 (Back Side)

FIG. 5D is a cross-sectional view of a laminate sheet 88 consisting of four layers, the layer structure of which is as follows.
(Surface Side) Paper Base Layer 882 / Intermediate Adhesive Layer 884 / Barrier Layer 885 /
Innermost thermoplastic resin layer 883 (back side)
This is a layer configuration in which the outermost thermoplastic resin layer 881 is removed from the laminated sheet 88 consisting of five layers shown in FIG. 5C.

The bonding between the layers of each laminated sheet 88 is performed by known dry lamination, extrusion coating, adhesives, or the like. Note that layers for bonding between layers are not shown because they are thin.

The outermost thermoplastic resin layer 881 and the innermost thermoplastic resin layer 883 are, for example, low density polyethylene (LDPE). Intermediate adhesive layer 884 is, for example, random copolymer of ethylene methacrylic acid (EMAA). The barrier layer 885 is, for example, a silica-deposited polyethylene terephthalate (hereinafter sometimes abbreviated as PET) film.

However, if the top side protruding portion 874 is strongly bent in the direction of the body portion 872 (bent at a substantially right angle), the top side protruding portion 874 is interposed between the upper overlapping plate 834 and the top plate 833. , the outer surface of the bent portion 876 of the top side projecting portion 874 is strongly stretched, and as shown in FIG. may occur.
Note that FIG. 4 is an enlarged view of a part of the cross section at the cross section position AA shown in FIG. A zipper tape 861 is included in its cross section.

The illustrated damage (crack) is an example of damage, and the mode of damage is not limited to these.

This is because the upper portion of the paper container 80 with a zipper of the prior art is sealed by joining the inner surfaces of the upper overlapping plate 834 to seal the container, so that the number of layers in that portion increases and the thickness increases. is.
Furthermore, since the zipper tape 861 is also joined to the upper overlapping plate 834, the number of layers in this portion increases and the thickness of this portion increases.

In FIG. 4, the cross section of the laminated sheet 88 of the blank plate 81 of the conventional paper container 80 with a zipper is shown as a single layer, but the laminated sheet 88 of the blank plate 81 has a multilayer structure. seat 88; However, in this figure, one layer is shown in order to make the figure easier to see.

At the bent portion 876 of the top side projecting portion 874, the four laminated sheets 88 and the zipper tape 861 are overlapped. With reference to each component described on the blank plate 81 in FIG. Connecting portion between the upper overlapping plate 834a and the side plate 843a of the back side top portion, connecting portion between the back side top plate 833a and the back side top portion protrusion portion 838a, back side plate 832a and the back side top side protrusion portion allowance 838a.

Most of the laminated sheets 88 of the paper container 80 with a zipper of the prior art are laminated with a paper base layer 882 and a synthetic resin film layer, and cracks occur in the paper base layer 882, which is inferior in tensile strength among its constituent elements. likely to occur. If the stretching is particularly strong, along with the cracking of the paper base layer 882, the inner synthetic resin film layer may also crack.

If the synthetic resin film layer is cracked, the barrier properties (oxygen, water vapor, fragrance retention, etc.) of the laminated sheet 88 may be degraded. In particular, when the synthetic resin film layer itself has a barrier property, or when the synthetic resin film layer is subjected to a vapor deposition process, the barrier property may be lowered.

Damage (cracks) 879 of the laminated sheet 88 are generated irregularly, and the paper base layer 882 at the cross section of the damages (cracks) 879 is torn and ugly. Therefore, the appearance of the paper container 80 with a zipper is deteriorated, and if there is printing on the relevant portion of the laminated sheet 88, the printed characters and patterns may be damaged.

5A, 5B, 5C, and 5D, each of the zippered paper containers 80 made up of the laminated sheets 88 is damaged (cracked) at the bent portion 876 of the top side protruding portion 874. There is fear.

JP-A-2005-178833

The present disclosure has been made to solve the above problems, and the problem is to bend the top side protruding portion 74 in the direction of the body portion 72 of the paper container 90 in the paper container 90 with a zipper. Bending of the top side protrusion 74 interposed between the top side protrusion 74 and the front side top plate 33b and the front side upper overlapping plate 34b when joining to the body portion 72 by To provide a zippered paper container 90 in which the part 76 is less likely to be damaged (cracked).

The above problems can be solved by the following embodiments of the present disclosure.
That is, the zipper-equipped paper container 90 of the present disclosure is
In a zippered paper container 90 in which a blank plate 10 made of a laminated sheet 78 including a paper base layer 782 is assembled,
The blank plate 10 includes at least a front side blank plate 10b and a back side blank plate 10a,
An upper overlapping plate 34, which is joined by overlapping the front side blank plate 10b and the back side blank plate 10a on the upper part of the paper container 90 with a zipper, and the lower side of the upper overlapping plate 34 A top portion 71 consisting of a top plate 33 connected to the
a top side plate 41 connected to the left and right sides of the upper overlapping plate 34;
a top side projecting portion 74 continuously provided on both left and right sides of the top portion 71;
a body portion 72 provided on the lower side of the top portion 71;
a bottom portion 73 provided on the underside of the trunk portion 72;
an upper sealing portion 53 that traverses the upper edge portion 21 of the upper overlapping plate 34 and the top side plate 41 or the vicinity of the upper edge portion 21;
a zipper tape 61 located under the upper sealing portion 53 and crossing the upper overlapping plate 34 and the side plate 41 of the top portion,
At least the laminated sheet 78 of the front side blank plate 10b has a paper base protective layer 788 on any layer of the outer side of the paper base layer 782 .

In addition, in the paper container 90 with a zipper according to an embodiment of the present disclosure,
The paper substrate protective layer 788 may be a film having a higher tensile strength than polyethylene.

In addition, in the paper container 90 with a zipper according to an embodiment of the present disclosure,
The paper substrate protective layer 788 may be a film having a higher tensile modulus than polyethylene.

In addition, in the paper container 90 with a zipper according to an embodiment of the present disclosure,
The paper substrate protective layer 788 may be an oriented polyethylene terephthalate film.

In addition, in the paper container 90 with a zipper according to an embodiment of the present disclosure,
The paper substrate protective layer 788 is a stretched nylon film.

In addition, in the paper container 90 with a zipper according to an embodiment of the present disclosure,
The paper substrate protective layer 788 may be an oriented polypropylene film.

In addition, in the paper container 90 with a zipper according to an embodiment of the present disclosure,
The paper substrate protective layer 788 may have a thickness of 10 μm or more and 200 μm or less.

According to the embodiment of the present disclosure described above, the top side protruding portions 74 connected to the left and right sides of the top portion 71 of the zipper-equipped paper container 90 are joined to the body portion 72 of the zipper-equipped paper container 90. At this time, the paper base material layer 782 of the laminated sheet 78 at the bent portion 76 of the top side projecting portion 74 is protected by the paper base material protective layer 788 provided on any layer of the outer side. . For this reason, damage (cracking) is less likely to occur in the bent portion 76 of the top side projecting portion 74 .

FIG. 3 is an exploded view of a blank plate 81 used for manufacturing a paper container 80 with a zipper according to the prior art. 1 is a perspective view of a prior art zippered paper container 80. FIG. 1 is a plan view of a conventional zippered paper container 80. FIG. FIG. 11 is an enlarged cross-sectional view of a folded portion 876 of a conventional paper container with a zipper at a position where a zipper tape 861 is joined to a protruding portion 874 on the top surface of the paper container. (See FIG. 3 cross-sectional position AA). 1 is a cross-sectional view of a laminated sheet 88 of one embodiment of a prior art blank plate 81. FIG. FIG. 10 is a cross-sectional view of another embodiment of a laminated sheet 88 of the blank plate 81 of the prior art; FIG. 8 is a cross-sectional view of a laminated sheet 88 of still another embodiment of the blank plate 81 of the prior art; FIG. 11 is a cross-sectional view of a laminated sheet 88 of still another embodiment of the blank plate 81 of the prior art; FIG. 4 is an exploded view of the front side blank plate 10a used for manufacturing the zippered paper container 90 of the embodiment of the present disclosure. FIG. 4 is an exploded view of the back shell blank plate 10b used for manufacturing the zippered paper container 90 of the embodiment of the present disclosure. FIG. 6B is a front view showing the shape of a paper container (flat state) 91 in an intermediate stage when the paper container 90 with zipper is manufactured using the blank plate 10 shown in FIGS. 6A and 6B. FIG. 6B is a perspective view showing the shape of a paper container (folded state) 92 in an intermediate stage when the paper container 90 with zipper is manufactured using the blank plate 10 shown in FIGS. 6A and 6B. FIG. 6B is a perspective view of a zippered paper container 90 produced using the blank plate 10 shown in FIGS. 6A and 6B. FIG. 10 is a side view of the zippered paper container 90 shown in FIG. 9; FIG. 10 is a plan view of the zippered paper container 90 shown in FIG. 9; Fig. 10 is a perspective view of the paper container 90 with a zipper shown in Fig. 9 with the top portion 71 opened; 7 is a cross-sectional view of a laminated sheet 78 of one aspect of the blank plate 10 of the present disclosure; FIG. FIG. 4 is a cross-sectional view of a laminated sheet 78 of another embodiment of blank plate 10 of the present disclosure; FIG. 5 is a cross-sectional view of a laminated sheet 78 of still another embodiment of blank plate 10 of the present disclosure; FIG. 10 is an enlarged cross-sectional view of the folded portion 76 at the joint position of the zipper tape 61 of the top side protruding portion 74 in the zipper-equipped paper container 90 shown in FIG. 9 ; (See FIG. 11 cross-sectional position BB). FIG. 4 is an enlarged cross-sectional view of one mode of a joint portion between the blank plate 10 and the zipper tape 61; (See FIG. 7 cross-sectional position CC). FIG. 10 is an enlarged cross-sectional view of another aspect of the joint portion between the blank plate 10 and the zipper tape 61; (See FIG. 7 cross-sectional position CC).

The present disclosure will be described below with reference to the drawings. However, the present disclosure is not limited to these specifically shown forms or to the various specifically described structures.
In addition, in each drawing, the sizes and ratios of members may be changed or exaggerated for the sake of clarity. In addition, for the sake of clarity, parts that are not necessary for explanation or repeated symbols may be omitted.

In addition, numerical values such as dimensions and material names of each member described in this specification are examples as an embodiment, and are not limited to these, and can be appropriately selected and used. In this specification, terms specifying shapes and geometrical conditions, such as parallel, orthogonal, and perpendicular terms, not only have strict meanings but also include substantially the same states.

The blank plate 10 of the zippered paper container 90 of the present disclosure is laminated with a paper base layer 782, and a paper base protective layer 788 is laminated on any layer of the outer side of the paper base layer 782, and Using a laminate sheet 78 in which a thermoplastic resin such as polyethylene is laminated as at least the innermost layer, the outer shape is formed into a rectangular shape, and various folding lines provided in the blank plate 10 are used to form a paper container 90 with a zipper. Forming plates for each part necessary for forming are divided.
Note that the outer layer of the paper base layer 782 may be only one layer, and in that case, one outer layer is the paper base protective layer 788 .

<First embodiment>
<Blank plate>
The blank plate 10 of the zipper-equipped paper container 90 of this embodiment is shown in FIGS. 6A and 6B. FIG. 6A represents the back side blank plate 10a and FIG. 6B represents the front side blank plate 10b. The two sheets of the back side blank plate 10a and the front side blank plate 10b are collectively referred to as the blank plate 10. FIG.

In addition, unless otherwise specified, in each component of the blank plate 10 described later, the suffix a of each reference numeral indicates the element of the back side blank plate 10a, and the suffix b indicates the front side blank plate 10b. indicates an element of In elements with both suffixes a and b, non-suffixed symbols shall include both a and b.

The back shell upper edge 21a, which is the bottom shell of the back shell blank plate 10a in FIG.
The top edge 21b of the front side blank plate 10b in FIG.

In both FIGS. 6A and 6B, the front surface of the drawing is the outer surface when the paper container 90 with zipper is assembled, and the back surface is the inner surface.
6A and 6B are line symmetrical with respect to the upper edges 21a and 21b, respectively, except for some constituent elements (such as the top side projection bending line 15), which will be described later. When the inner surfaces of the side blank plate 10a and the front side blank plate 10b are aligned and placed on top of each other, the constituent elements (formation plates, lines, seal portions, zipper tape joining portions, etc., which will be described later) overlap.

The back side blank plate 10a and the front side blank plate 10b, which are aligned and superimposed, are joined together to produce an intermediate-stage zipper-equipped paper container (flat state) 91 as shown in FIG. An intermediate-stage zipper-equipped paper container (folded state) 92 as shown in FIG. 8 is manufactured, and the procedure proceeds toward the completion of the zipper-equipped paper container 90. This manufacturing method will be described later.

Unless otherwise specified, the top, bottom, left, and right of the front side blank plate 10b will be shown with reference to FIG. 6B. The back shell blank plate 10a will also be described with its upper edge 21a as the upper shell. Therefore, FIG. 6A is upside down.
In the paper container 90 with a zipper, the upper edge portion 21 is used as the upper side, and the lower edge portion 26 is used as the lower side.

The zippered paper container 90 thus formed is composed of a top portion 71, a body portion 72, and a bottom portion 73 in order from the top, as will be described later. The lower side is sometimes called the bottom side. (See Figure 9).
In addition, when describing the vertical direction of each component provided on the top portion 71, the description of the top side indicates the upper edge portion 21 side, and the vertical direction of each component provided on the bottom portion 73. In describing the bottom side, reference to the bottom side may also refer to the lower edge 26 side.

As described above, the back side blank plate 10a and the front side blank plate 10b are vertically symmetrical, so the description of the blank plate 10 will be made with respect to the front side blank plate 10b.
Further, the back side blank plate 10a and the front side blank plate 10b are the same in material (layer structure) and manufacturing method.

The front side blank plate 10b of the zipper-equipped paper container 90 of the present embodiment uses a laminated sheet 78 in which at least paper as a base material is laminated, and at least the innermost layer is a thermoplastic resin such as polyethylene, and the outer shape is approximately It is formed in a rectangular shape. Referring to FIG. 6B, the upper side is upper edge 21b, the left and right sides are front side edge 11b, and the lower side is lower edge 26b.
In addition, the front side blank plate 10b has a symmetrical shape with a vertical line passing through the central portion in the width direction as an axis of symmetry.
Note that the laminated sheet 78 will be described later.

On the front side blank plate 10b, from the front side upper edge portion 21b, the front side first lateral bending line 22b, the front side second lateral bending line 23b, and the front side third lateral bending line 22b, which are present in the transverse direction in order, are formed. A horizontal folding line 24b and a front side fourth horizontal folding line 25b are provided.
Preferably, the transverse fold lines 22b, 23b, 24b, 25b are respectively parallel to the upper edge 21b and the lower edge 26b of the face.

On the front side blank plate 10b, from the left side, a front side first vertical folding line 12b, a front side second vertical folding line 13b, a front side second vertical folding line 13b, and a front side A side first longitudinal fold line 12b is provided.
That is, the vertical folding line closer to the side edge portion 11b of each front side blank plate 10b is the front side first vertical folding line 12b, and the vertical folding line farther from the side edge portion 11b of the front side blank plate 10b. The bending line is the front side second longitudinal bending line 13b.
It is desirable that each of the front side longitudinal fold lines 12b, 13b is substantially parallel to the side edge 11b of the front side blank plate 10b.

Furthermore, a pair of oblique folding lines 17b for the top side of the front side and a diagonal bending line 18b for the bottom side of the front side are provided on the left and right sides, respectively, to form each part necessary for forming the paper container 90 with a zipper. The board is divided and configured.

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

The upper end of the front side bottom diagonal folding line 18b is the front side second bottom intersection point Hb, which is the intersection of the front side second vertical folding line 13b and the front side third horizontal folding line 24b. in the same position.
The lower end of the front side bottom diagonal folding line 18b is the front side first bottom intersection point Gb, which is the intersection of the front side first vertical folding line 12b and the front side fourth horizontal folding line 25b. in the same position.

It should be noted that each of the front side oblique folding lines 17b described above may be located in the vicinity of each of the intersections Eb and Fb described above without being in contact with them. Further, the respective front side oblique fold lines 18b may be located in the vicinity of, but not in contact with, the respective intersections Gb, Hb.
By locating each of the oblique folding lines of the front side and each of the intersections near each other without touching each other, there is no excessive concentration of folding lines at a specific location while maintaining sufficient folding performance. , it is possible to prevent a decrease in the strength of the laminated sheet of the front side blank plate 10b.

Front side edge sealing margins 36b are formed on both left and right side edge portions 11b of the front side blank plate 10b via the front side first longitudinal bending line 12b.

In addition, on the lower edge portion 26b of the front side blank plate 10b, a bottom side seal margin 37b is formed through the fourth horizontal bending line 25b of the front side. there is

Forming plates of respective portions are sequentially provided on the front side blank plate 10b in the downward direction from the front side upper edge portion 21b located at the uppermost side.

Describing the main part, a front side upper overlapping plate 34b is provided on the lower side of the central region of the front side upper edge portion 21b. A front side top plate 33b is connected to the lower side of the front side upper overlapping plate 34b via a front side first horizontal folding line 22b. A front side wall plate 31b is connected to the lower side of the front side top plate 33b via a front side second lateral bending line 23b. A front bottom plate 35b is connected to the lower side of the front wall plate 31b via a third lateral bending line 24b.

In addition, the side plate 41b of the top of the front side is connected to the outside of both the left and right sides of the upper upper overlapping plate 34b via the second vertical bending line 13b of the front side. there is

In addition, on the outside of both the left and right sides of the front side top plate 33b, a front side top side protruding portion allowance 38b is continuously provided via the front side second vertical folding line 13b. .

In addition, on the outside of both the left and right sides of the front side wall plate 31b, the front side wall plate 32b is continuously provided via the front side second vertical bending line 13b.

In addition, on the outside of both the left and right sides of the bottom surface plate 35b, front side bottom side protruding portion margins 43b are continuously provided via the front side second vertical bending lines 13b.

In addition, a front side top side protruding portion allowance 38b is continuously provided to the lower side of the side plate 41b of each front side top portion via the front side first horizontal folding line 22b. . The front side plate 32b is connected to the lower side of the front side top side protruding portion allowance 38b via the front side second lateral bending line 23b. A front side bottom side protruding portion allowance 43b is continuously provided to the lower side of the front side plate 32b via a front side third lateral bending line 24b.

Bottom side seal margins 37b are continuously provided under the front side bottom plate 35b and the bottom sides of the front side bottom side projecting portion allowances 43b on both left and right sides thereof.

Left and right sides of the side plate 41b of the top side of the front side, the protrusion portion 38b of the top side of the front side, the side plate 32b of the front side, and the bottom side protrusion 43b of the front side A seal margin 36b on the side edge of the front side is continuously provided to the side through the first longitudinal bending line 12b of the front side.

The processing (ruling line processing) of the present embodiment for giving a folding line to the blank plate 10 is performed after the laminated sheet 78 is completed, and then the laminated sheet is supplied to a machine that manufactures the paper container 90 with a zipper. do. Alternatively, the creasing process may be performed by a machine that manufactures the paper container 90 with a zipper.

As the ruled line processing method, an appropriate method is adopted from known methods such as a platen method and a rotary die method.
Also, the laminated sheet 78 may be cut before the ruled lines are processed. Alternatively, the laminated sheet 78 may be supplied in roll form to the creasing process.

A punching process for punching the laminated sheet 78 to manufacture the blank plate 10 will also be described. For the punching process, an appropriate method is selected from known methods such as a platen method and a rotary die method. The blank plate 10 may be formed directly from the roll-shaped laminated sheet 78, or may be punched after being cut into sheets once.
Also, the order of creasing and punching does not matter. They may be processed at the same time.

In addition, the roll-shaped laminated sheet 78 slit to a predetermined roll width is supplied to a machine for manufacturing the paper container 90 with a zipper, and the rolled laminated sheet 78 is cut in the transverse direction to produce the blank plate 10. good too.

Further, the back side blank plate 10a and the front side blank plate 10b are line-symmetrical and have the same shape. In other words, it is a blank plate having substantially the same shape with the layer structure of the blank plate being reversed.

FIG. 7 is a front view showing the shape of a chuck-equipped paper container (flat state) 91 at an intermediate stage when the chuck-equipped paper container 90 is manufactured using the blank plate 10 shown in FIGS. 6A and 6B. The uppermost portion is the upper edge portion 21b of the front side blank plate 10b shown in FIG. 6B, and the back side thereof is provided with the back side blank plate 10a. Although the back side blank plate 10a cannot be visually observed, it has substantially the same shape as the front side blank plate 10b when seen through.

In FIG. 7, the back side blank plate 10a and the front side blank plate 10b are overlapped, and each component has the same positional relationship within the range of manufacturing variation when viewed through the drawing. The notation and subscripts of wa may be omitted in the explanation.

On the upper overlapping plate 34 and the side plate 41 of the top of the front side, an upper sealing portion 53 as a transverse direction sealing means and a zipper tape joint are provided at predetermined positions where the two blank plates described above overlap each other. The portions 52 are provided sequentially starting from the upper edge portion 21 .

The upper sealing portion 53 is provided at or in the vicinity of the upper edge portion 21 of the upper overlapping plate 34 and the side plate 41 of each top portion.
If the upper seal portion 53 is substantially parallel to the upper edge portion 21, the length of the upper seal portion 53 can be shortened and the blank plate 10 is not wasted.

The upper seal portion 53 as a transverse sealing means is formed by joining an upper front seal portion 53b and an upper back seal portion 53a which face each other. Since the bonding is performed across the entire width of the upper edge 21 of the zipper-equipped paper container 90 or the vicinity of the upper edge 21 , the zipper-equipped paper container 90 is kept airtight.

Also, the upper seal portion 53 is preferably substantially parallel to the upper edge portion 21 . Furthermore, it is desirable that the zipper tape joint portion 52 is substantially parallel to the upper edge portion 21 .
In such a form, it becomes easy to open and close the zipper tape 61 and take out the contents. Also, the length of the zipper tape 61 can be shortened.

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

As shown in FIG. 7, the easy-to-open processing line 51 extends from one side edge 11 of the blank plate 10 to the other side edge 11, and is present between the upper seal portion 53 and the zipper tape 61. .

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

By cutting the easy-to-open processing line 51 from one side edge (here, the right side) 11 and reaching the other side edge (here, the left side) 11, the upper overlapping plate 34 and the front side are cut. The side plate 41 of the top portion is cut across and the upper sealing portion 53 is also cut off, exposing the zipper tape 61 .

When using an intermittent half-cut line or a linear half-cut line for the easy-open processing line 51 of the unsealing means, it may be formed by a method using a normal blade, but a method using laser light irradiation, By using a method using ultrasonic waves, a method called diamond cutting, it is possible to form half-cut lines with superior precision and stability.

Moreover, the easy-open processing line 51 may be belt-shaped with a width. Moreover, multiple easy-to-open processing lines 51 may be provided. By providing a plurality of cut lines 51, it is possible to prevent deviation of cutting of the easy-open processing line 51.

The easy-open processing line 51b may not be provided depending on the material of the laminated sheet 78 of the front side blank plate 10b, the layer structure, the status of the easy-open processing, and the like. Even if there is no easy-open processing line 51b, it may be possible to open the package manually.

Furthermore, when the easy-open processing line 51b is not provided as described above, the package may be opened with a cutting tool such as scissors. In that case, the planned opening line may be displayed by printing. Moreover, the printing position may be printed at the position of the easy-open processing line 51b shown in FIG. 6B. Further, the planned opening line may not be clearly marked on the paper container 90 with a zipper, but may be described in an attached manual or the like.

<Chuck tape>
In the zipper tape 61, a male zipper tape 61m and a female zipper tape 61f are formed by extrusion molding, and a male zipper tape fitting portion 63m and a female zipper tape fitting portion 63f are fitted. are combined.

<Procedure for joining zipper tape>
The procedure for assembling the zipper-equipped paper container 90 will be described later, and among the procedures, the joining procedure for the zipper tape 61 will be described here.

In this case, the zipper tape joining portion 52 is a portion to be joined to the zipper tape 61 when assembling the paper container 90 with a zipper.

The back side blank plate 10a and the front side blank plate 10b are superimposed, and the side edge seal margins 36 and the upper seal portions 53 are heat-sealed.
At this time, the male zipper tape 61m and the female zipper tape 61f are fitted in advance at the male zipper tape fitting portion 63m and the female zipper tape fitting portion 63f, respectively. inserted. At the same time, the outer surfaces of the two blank plates 10 are exposed, and the fastener tape joining portions 52 are heated and pressurized. Then, the blank plate 10 and the zipper tape 61 are heat-sealed. (See FIGS. 15A and 15B).

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

By heat-sealing the zipper tape 61 by such a method, the position of the heat seal is reduced compared to the method of separately heat-sealing the male zipper tape 61m and the female zipper tape 61f to the zipper tape joint portion 52. Since the deviation is reduced and the mounting process is simplified, the zipper tape 61 can be mounted with good production efficiency.

<Lamination sheet of blank plate>
As described above, the laminated sheet 78 used for the blank plate 10 is formed by laminating at least the paper base layer 782 and laminating a thermoplastic resin such as polyethylene as at least the innermost thermoplastic resin layer 783. A barrier layer 785 for water vapor, oxygen, or other substances, a strength-enhancing layer, and the like can be provided on the intermediate layer, if necessary.

The paper substrate protective layer 788 will be described. When the top side projecting portion 74 is bent over the body portion 72, the outer side of the bent portion 76 is stretched. In a laminated sheet without the paper base protective layer 788, the paper base layer 782 is stretched and damaged. Here, the paper substrate protective layer 788 is a film that has a high tensile strength and does not stretch easily when pulled. The paper base layer 782 that is bonded directly to or near the film is protected by the paper base protective layer 788, stretched less (length), and is not damaged (broken).

The film used for the paper substrate protective layer 788 is desirably a film that has a high tensile strength and does not stretch easily when pulled as described above. In addition, since it is used as a packaging material, it is flexible enough to be stored in a roll, easy to cut when processed, stretchable when creased, low cost, and hygienic when used as a product container. is required.

Synthetic resin films are available as materials that satisfy these conditions, and among these, synthetic resin films that are suitable for stretching are desirable.
Examples of films that satisfy the above conditions include oriented polyethylene terephthalate (PET), oriented nylon (hereinafter sometimes referred to as ONy), and oriented polypropylene (hereinafter sometimes referred to as OPP).

The thickness of these films is desirably 10 μm or more and 200 μm or less. If the thickness of the film is less than 10 μm, the tensile strength and the difficulty of elongation are inferior. If the thickness exceeds 200 μm, it becomes difficult to carry out folding process and creasing process, and the cost of the film increases more than necessary.

The paper base layer 782 will be described. The paper base layer 782 is preferably made of paper that is rigid and does not easily crack when folded along a folding line or the like. It is possible to appropriately select and use a suitable one in consideration of water resistance (sizing degree) and the like.
As specific examples, woodfree paper, base paper for cups, base paper for milk cartons, and the like can be preferably used, and the appropriate basis weight is in the range of 80 to 320 g/m ² .

The thermoplastic resin layer (sealant layer) used for the innermost layer and, if necessary, the outermost layer and the intermediate layer will be described. As the resin for the thermoplastic resin layer (sealant layer), in addition to low density polyethylene (LDPE) and linear low density polyethylene (LLDPE), medium density polyethylene (MDPE), high density polyethylene (HDPE), and single site catalyst are used. Polymerized ethylene/α-olefin copolymer, ethylene/vinyl acetate copolymer (EVA), ethylene/acrylic acid copolymer (EAA), ethylene/methacrylic acid random copolymer (EMAA), ethylene/ Methyl acrylate copolymer (EMA), ethylene-ethyl acrylate copolymer (EEA), ionomer, polypropylene and its copolymer, polyester resin, etc. can be used. A suitable one can be appropriately selected and used according to the contents to be stored and the conditions of storage and use.

Among the above thermoplastic resins, especially ethylene-methyl acrylate copolymer (EMA) and ethylene-methacrylic acid random copolymer (EMAA) have thermal stability during processing such as extrusion coating, and various substrates. The outermost thermoplastic resin layer, which does not require much thickness, can be formed with a relatively thin thickness of, for example, 6 to 10 μm. It is also easy to perform extrusion coating and lamination at a low thickness, and at the same time it is possible to reduce the use ratio of plastic materials, and at the same time, it is possible to obtain merits in terms of cost.

The thermoplastic resin layers (sealant layers) of the innermost layer as described above, and optionally the outermost layer and the intermediate layer (sealant layer) may be easily subjected to anchor coat, corona treatment, flame (flame) treatment, etc. on the lamination surface as necessary. After applying adhesive treatment, resin can be extrusion-coated and laminated on it, or thermoplastic resin can be formed into a film in advance and the film can be subjected to known dry lamination or extrusion lamination (sandwich lamination). For example, they can be laminated by pasting together.

When the barrier layer 785 is laminated on the intermediate layer of the lamination sheet 78, the barrier layer 785 may be a metal foil such as aluminum foil, a metal such as aluminum, silica, alumina, or an inorganic oxide such as a biaxially stretched PET film or a biaxially stretched PET film. A vapor-deposited film obtained by vapor-depositing a base film such as an axially stretched nylon film (ONy film) and a biaxially stretched polypropylene film (OPP film) to a thickness of 20 to 100 nm can be used. Alternatively, saponified ethylene-vinyl acetate copolymer (hereinafter sometimes referred to as EVOH) film, biaxially stretched nylon MXD6 film, polyacrylonitrile film, and PET provided with a coating layer of polyvinylidene chloride Films, ONy films, OPP films, etc. can be used.

Such a barrier layer 785 is preferably laminated on the inner side of the paper base layer 782 in order to effectively utilize its barrier properties. When a metal-deposited film is used, it can be laminated on the outer surface of the paper base material layer 782 in order to utilize the metallic feeling in the design. Lamination of the barrier layer 785 can be easily performed by known dry lamination, extrusion lamination (sandwich lamination), or the like.

The layer structure of the laminated sheet 78 of the blank plate 10 of the zippered paper container 90 of the present embodiment is exemplified below. Cross-sectional views of laminated sheet 78 are shown in FIGS. 13A, 13B, and 13C.

FIG. 13A is an aspect of the layer structure of the laminated sheet 78 of the blank plate 10 of the paper container 90 with zipper according to the present embodiment, and is a cross-sectional view of the laminated sheet 78 of the blank plate 10 consisting of four layers. The layer structure is as follows.
(Outer Side) Outermost Thermoplastic Resin Layer 781/Paper Base Protective Layer 788/Intermediate Adhesive Layer 784/Paper Base Layer 782/Innermost Thermoplastic Resin Layer 783 (Inner Side)

Here, the surface on which patterns, characters, various codes, etc. are printed will be described. Although not shown, the surface to be printed (the outer surface or the inner surface of the corresponding layer) is the outer surface of the outermost thermoplastic resin layer 781, the outer surface or the inner surface of the paper substrate protective layer 788, and the outer surface of the paper substrate layer 782. There may be. In either case, it is desirable that the outer layer of the printed surface be transparent.

FIG. 13B is another aspect of the layer configuration of the laminated sheet 78 of the blank plate 10 of the paper container 90 with zipper according to the present embodiment, and is a cross-sectional view of the laminated sheet 78 of the blank plate 10 consisting of five layers. The layer structure is as follows.
(Outer Side) Paper Base Protective Layer 788 / Intermediate Adhesive Layer 784 / Paper Base Layer 782 /
Innermost thermoplastic resin layer 783 (inner side)
It has a layer structure in which an outermost thermoplastic resin layer 781 is added to the outermost layer of the four-layer blank plate 10 shown in FIG. 13A.

A surface for printing in this embodiment will be described. Although not shown, the surface to be printed (the outer surface or the inner surface of the relevant layer) may be the outer surface or the inner surface of the paper base protective layer 788 or the outer surface of the paper base layer 782 . In either case, it is desirable that the outer layer of the printed surface be transparent.

In addition, a barrier layer 785 can be provided when the blank plate 10 is required to have barrier properties (water vapor, oxygen, aroma retention, etc.). FIG. 5C is still another aspect of the layer configuration of the laminated sheet 78 of the blank plate 10 of the paper container 90 with zipper according to the present embodiment, and is a cross-sectional view of the laminated sheet 78 of the blank plate 10 consisting of six layers. The layer structure is as follows.
(Outer Side) Paper Base Protective Layer 788 / Intermediate Adhesive Layer 784 / Paper Base Layer 782 /
Intermediate adhesive layer 784 / barrier layer 785 / innermost thermoplastic resin layer 783
(inner side)

A surface for printing in this embodiment will be described. Although not shown, the surface to be printed (the outer surface or the inner surface of the relevant layer) may be the outer surface or the inner surface of the paper base protective layer 788 or the outer surface of the paper base layer 782 . In either case, it is desirable that the outer layer of the printed surface be transparent.

The bonding between the layers of each laminated sheet 78 is performed by known dry lamination, extrusion coating, adhesives, or the like. Note that layers for bonding between layers may not be shown when the thickness is thin.

<Production of paper container with zipper>
Next, from the blank plate 10 of the paper container 90 with a zipper, an intermediate paper container with a zipper (flat state) 91 is produced, and an intermediate paper container with a zipper (folding state) 92 is produced. An outline of the procedure until the package of the zippered paper container 90 filled with items is completed will be described.

<Production of paper container with zipper (flat state) at intermediate stage>
When the two blank plates 10 are overlapped, the zipper tape 61 having the male zipper tape 61m and the female zipper tape 61f pre-fitted is inserted in the position where the zipper tape joints 52 overlap each other. Then, the outer surfaces of the two blank plates 10 are exposed, and the zipper tape joining portions 52 are heated and pressed to be heat-sealed.

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

Also, notches 77 may be provided at each end of the easy-open processing line 51 (where they come into contact with the side edges of both sides). Note that the notch 77 may be provided at either one end.

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

In that device, a long printed laminated sheet 78 rolled up in a roll is fed out, and the folding line is processed, the chuck tape 61 is inserted and heat-sealed, and the side edge is Heat sealing of the side sealing margin 36, heat sealing of the upper sealing portion 53, punching of the notch 77, and the like may be performed.

It should be noted that the order of the steps may be changed as long as the desired chuck-equipped paper container 90 can be obtained.

Incidentally, FIGS. 15A and 15B show enlarged cross-sectional views of the joining portion of the zipper tape 61, which is the portion where the zipper tape 61 and the blank plate 10 are joined, in the zipper-equipped paper container (flat state) 91 in the intermediate stage. The cut point is shown at the cross-sectional position CC in FIG. Here, the blank plate 10 is exemplified by the four layer laminate sheet 78 of FIG. 13A.

In FIG. 15A, a female zipper tape 61f is joined to the front side blank plate 10b as the front side zipper tape 61b. The female zipper tape 61f includes a female zipper tape body portion 62f that is joined to the blank plate 10, and a female zipper tape fitting portion 63f that has a concave portion that fits with the male zipper tape 61m.
A male zipper tape 61m is joined to the back blank plate 10a as a back zipper tape 61a. The male zipper tape 61m includes a male zipper tape body portion 62m that is joined to the blank plate 10, and a male zipper tape fitting portion 63m that has a convex portion that fits with the female zipper tape 61f.

In FIG. 15B, a male zipper tape 61m is joined to the front side blank plate 10b as the front side zipper tape 61b. The male zipper tape 61m includes a male zipper tape body portion 62m that is joined to the blank plate 10, and a male zipper tape fitting portion 63m that has a convex portion that fits with the female zipper tape 61f.
A female zipper tape 61f is joined to the back blank plate 10a as a back zipper tape 61a. The female zipper tape 61f includes a female zipper tape body portion 62f that is joined to the blank plate 10, and a female zipper tape fitting portion 63f that has a concave portion that fits with the male zipper tape 61m.

It should be noted that whether the male zipper tape 61m or the female zipper tape 61f is joined to the front side blank plate 10b depends on the required performance of the paper container 90 with a zipper and the characteristics of the paper container 90 with a zipper. It is appropriately selected depending on the specifications of the manufacturing equipment.

The zipper tape fitting portion 63 of the zipper tape 61 is particularly thick, and the blank plate 10 is positioned at the zipper tape fitting portion 63 when the bent portion 76 of the top side protrusion 74 is bent. Damage (cracks) is likely to occur.

<Production of paper container with zipper (folded state) at intermediate stage>
A mandrel is inserted from the opening of the bottom 73 of the paper container with zipper (flat state) 91 at this intermediate stage, leaving the upper overlapping plate 34, and the top plate 33 on the lower side thereof is first horizontally folded. Widened back and forth by the line 22, the upper lapping plate 34 is erected upward.

Here, in order to reliably perform the bending process of the ridge portion 72d of the body portion 72, the inner side and/or the outside of the body portion 72 are known, and an auxiliary member is brought into contact with the vicinity (including contact) of the ridge portion 72d. You may let

A top portion 71 formed by the top plate 33 and a body portion 72 are continued to the lower part of the upper overlapping plate 34, and an intermediate-stage paper container with a zipper (folding state) 92 is formed in which the bottom portion 73 opens in a substantially rectangular shape. be done. At this stage, as shown in FIG. 8, the upper overlapping plate 34 stands upward.

In the design, the shape of the horizontal cross section of the body portion 72 and the shape of the opening of the bottom portion 73 are assumed to be rectangular. Therefore, it is assumed to be substantially rectangular, including cases where the shape is not perfectly rectangular.

<Forming and filling paper containers with zippers>
Next, the upper stacking plate 34 standing upward is folded to the rear side (back side top plate 33a side) and laid down, and the top side protruding portion 74 protruding to both the left and right sides. is bent toward the side plate 32 and joined to the trunk portion 72 .
At this time, the bent portion 76 of the top side projecting portion 74 is bent. An auxiliary member may be brought into contact with the vicinity (including abutment) of the top side protrusion bending line 15 from the side and/or the outside.

The method of joining the top side projecting portion 74 to the trunk portion 72 includes a method of using an adhesive (hot melt, etc.), a method of using an adhesive tape, and a method of mechanically joining (engagement, joining, etc.). equipment), etc. may be used. Moreover, when the outermost layer of the blank plate 10 is provided with a thermoplastic resin layer (sealant layer), there is a method in which the thermoplastic resin layer (sealant layer) is heat-sealed.
A similar method is used for joining the bottom side protrusion 75, which will be described later.

In addition, the tip portion of the top side projection portion 74 may be joined to the body portion 72 of the paper container 90 with a zipper.
In addition, a portion other than the leading end of the top side projecting portion 74 may be joined to the body portion 72 of the paper container 90 with a zipper. In that case, the tip of the top side projecting portion 74 does not have to be joined to the body portion 72 of the zipper-equipped paper container 90 .

The bottom part 73 of the paper container with zipper in the intermediate stage (folded state) 92 formed as described above is directed upward, the contents are filled from the open bottom part 73, and then the bottom part 73 is folded, The bottom side seal margins 37 are heat-sealed in a palm-to-palm seal manner.

After that, the joined bottom side seal allowance 37 is folded and laid on the back side (back side bottom plate 35a side), and the bottom side protruding portions 75 protruding on both the left and right sides are formed on the bottom plate. 35 is folded and joined to complete a package of a paper container 90 with a zipper in a substantially rectangular parallelepiped shape.

FIG. 9 is a perspective view showing a zippered paper container 90 of this embodiment. FIG. 10 is a side view of the zippered paper container 90 shown in FIG. FIG. 11 is a plan view of the zippered paper container 90 shown in FIG.

The zippered paper container 90 shown in FIG. 9 has a substantially rectangular parallelepiped outer shape, and has a ridge 72d of the body 72 thereof.
Since the zippered paper container 90 is composed of a flexible laminated sheet 78 mainly made of paper, it does not have a perfect rectangular parallelepiped shape.

The function and effect of the paper base material protective layer 788 at the bent portion 76 of the top side protruding portion 74 of the paper container 90 with zipper according to the present embodiment will be described.
FIG. 14 shows an enlarged cross-sectional view of the bent portion 76 of the top side projecting portion 74 . The cross-sectional position is the cross-sectional position BB shown in FIG. The front side blank plate 10b and the back side blank plate 10a illustrated in FIG. 14 are the three-layer laminated sheet 78 shown in FIG. 13A.

When the top side projection 74 is bent to be joined to the body 72, the front side blank plate 10b at the bent portion 76 of the top side projection 74 is stretched.
Here, a tensile load is also applied to the paper base protective layer 788, which is difficult to stretch because it has been stretched, but the paper base protective layer 788 is hardly stretched. By doing so, the expansion of the paper base layer 782 laminated on the inner side of the paper base protective layer 788 can be suppressed, and the paper base layer 782 can be prevented from being damaged (cracked).

The paper substrate protective layer 788 and the paper substrate layer 782 may be laminated directly. Alternatively, one or more layers may be interposed between them as long as the effect of restraining the elongation of the paper base protective layer 788 to the paper base layer 782 is not impaired.

The paper base material protective layer 788 is always provided on the front side blank plate 10b in which the bent portion 76 of the top side protrusion 74 is likely to be damaged (cracked).
At that time, the paper substrate protective layer 788 may not be provided on the back cover blank plate 10a. In this case, since the paper substrate protective layer 788 is eliminated, the cost of the blank plate 10 can be reduced.

Alternatively, the backing blank board 10a may be provided with a paper base protective layer 788. FIG. In this case, the appearance (texture) of the surface of the front side blank plate 10b and the back side blank plate 10a is the same, so the appearance is excellent. Furthermore, since only one type of lamination sheet 78 is required for the blank plate 10, the management of the manufacturing process of the lamination sheet 78 is facilitated, and the arrangement and management of materials for the lamination sheet 78 are also facilitated.

<Opening operation for taking out a paper container with a zipper>
FIG. 12 shows a state in which the top portion 71 of the package body of the completed paper container 90 with a zipper is opened to take out the contents.

The easy-to-open processing line 51 is opened manually from a notch 77 provided in one side (here, the right side) of the side edge 11, and the other side (here, the left side) is opened. The cut is made up to the edge 11 .

Next, the front side opening gripping margin 57b between the front side easy-open processing line 51b and the front side zipper tape 61b and the back side between the back side easy-open processing line 51a and the back side zipper tape 61a are The chuck tape 61 exposed at the easy-to-open processing line 51 is opened by grasping the unsealing gripping margins 57a and spreading them in the outer side direction of the paper container 90 with a zipper.

When the zipper tape 61 is opened, the end of the side edge 11 of each blank plate 10 of the zipper tape 61 is opened over substantially the entire width up to the seal allowance 36. .
As described above, the removal opening 56 is formed by separating the male zipper tape 61m and the female zipper tape 61f of the zipper tape 61. As shown in FIG.

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

<Example 1>
In Example 1, using the blank plate 10 of FIGS. 6A and 6B corresponding to the first embodiment, a zipper-equipped paper container 90 having the configuration shown in FIG. 9 was produced.

The two blank plates 10 of FIGS. 6A and 6B are prepared, and their inner surfaces are aligned and overlapped, and as shown in FIG. It was heat-sealed, and the upper seal portion 53 was also heat-sealed. At the same time, the zipper tape 61 was also heat-sealed. In this way, an intermediate-stage paper container with a zipper (flat state) 91 in which the bottom seal margin 37 was not sealed was produced.

The laminated sheet 78 of the blank plate 10 has the following structure. FIG. 13A shows a cross-sectional view of the laminated sheet 78, but the printed layer such as a pattern is not shown.
(outer side)
Paper substrate protective layer 788 (stretched PET film 12 μm T4102 Toyobo) /
Intermediate adhesive layer 784 (LDPE 15 μm LC520 Japan polyethylene) /
Pattern printed layer (gravure printing on the outer surface of the paper base layer 782) /
Paper base layer 782 (base paper for liquid paper container 150 g/m ² Nippon Paper Industries) /
The innermost thermoplastic resin layer 783 (LDPE 30 μm LC520
Japan Polyethylene)
(inner side)

A method for manufacturing the laminated sheet 78 will be described.
First, a roll-shaped paper base material layer 782 was unwound, and predetermined patterns and characters were gravure-printed at predetermined positions, and then rolled up again.

In the next step, the roll-shaped paper base layer 782 is unwound, and the outer surface of the paper base layer 782 is covered with a paper base protective layer 788 (stretched PET film of 12 μm) and a melted intermediate adhesive layer 784. Laminated by extrusion lamination (sandwich lamination) with (LDPE 15 μm) in the middle.

Next, an innermost thermoplastic resin layer 783 (LDPE 30 μm) was formed on the inner surface of the paper base layer 782 by extrusion lamination.
Next, the laminated sheet 78 laminated by the above processing was rolled up into a roll.

Anchor coat treatment, corona treatment, flame treatment (flame treatment), or the like may be performed between each bonding layer as necessary to improve the bonding strength. Alternatively, the melted resin may be subjected to an ozone treatment or the like.

Next, the roll-shaped laminated sheet 78 is unwound, and the blank plate 10 is completed by subjecting it to creasing, punching, and the like.

Both the male zipper tape 61m and the female zipper tape 61f are heat-sealed on the zipper tapes 61 that are heat-sealed and attached to the inner surfaces of the top overlapping plate 34 and the top side plate 41 of the paper container 90 with zipper. The zipper tape body portion 62 has a two-layer structure.
The zipper tape 61 has a resin layer formed of LLDPE on the side heat-sealed to the paper container 90 with a zipper, and a resin layer on the opposite side formed of MDPE. The fitting portions of 63m and the female zipper tape fitting portion 63f are both made of LLDPE, and the width of the zipper tape body portion 62 is 7 mm.

The dimensions of the back side blank plate 10a and the front side blank plate 10b are rectangular with a length of 220 mm and a width of 169 mm. A side edge seal allowance 36 was provided.
In addition, the lower edges 26 of the lower sides were each provided with a bottom side seal allowance 37 having a width of 10 mm.
In addition, in the vicinity of the upper edge portions 21 of the upper overlap plate 34 and the side plate 41 of the top portion, a seal margin of the upper seal portion 53 having a width of 3 mm was provided.

The blank plate 10 includes an upper overlapping plate 34, a first horizontal bending line 22, a top plate 33, a second horizontal bending line 23, a wall surface plate 31, and a third horizontal bending in order from the upper edge 21 toward the lower side. A line 24 and a bottom plate 35 were provided in this order.

Further, side plates 41 of the top portion were provided on the outside of both flanks of the upper overlapping plate 34 via the second vertical folding line 13 .

In addition, on the outside of both flanks of the top panel 33 , a top ridge protruding portion allowance 38 is provided via the second vertical bending line 13 .

In addition, side plates 32 were provided on the outside of both sides of the wall plate 31 via the second vertical bending line 13 .

In addition, a bottom side protruding portion allowance 43 is provided on the outside of both sides of the bottom plate 35 via the second vertical bending line 13 .

Then, when the inner surfaces of the two blank plates 10 are aligned and superimposed on the upper overlapping plate 34 and the side plate 41 of the top portion, the upper edge portion 21 that becomes the upper edge when superimposed is 10 mm below the upper edge portion 21 . 7, an easy-open processing line 51 as a means for opening the container is provided in the transverse direction of the top portion 71 of the paper container 90 with a zipper, together with the printing of the paper base material layer 782 of the laminated sheet 78. . The easy-open processing line 51 was provided as an intermittent half-cut line.

Under the easy-to-open processing line 51, a zipper tape 61 is placed on the inner surface of the upper overlapping plate 34 and the side plate 41 of the top part with a gap of 5 mm, and crosses the top part 71 of the paper container 90 with a zipper. oriented to be heat sealed.

In addition, after joining the two blank plates 10 and heat-sealing the zipper tape 61, heat-sealing the side edge seal margin 36, and heat-sealing the upper seal portion 53 by the above-described method, the two blank plates 10 are easily overlapped. A notch 77 was provided in the side edge portion 11 of the right side of the opening process line 51, and an intermediate-stage paper container with a zipper (flat state) 91 in which the bottom side seal margin 37 was not sealed was produced. (See FIG. 7).

Next, this intermediate-stage paper container with zipper (flat state) 91 has a mandrel inserted through the opening of the unsealed bottom side seal allowance 37, leaving the upper overlapping plate 34, and the bottom thereof is The top plate 33 of the top plate was spread forward and backward along the first horizontal folding line 22, and the upper overlapping plate 34 was erected upward.
A top portion 71 formed by the top plate 33 and a body portion 72 having a substantially rectangular horizontal cross section (a plane substantially parallel to the bottom surface) continue below the upper overlapping plate 34, and a bottom portion 73 opens in a substantially rectangular shape. An intermediate-stage paper container with zipper (folded state) 92 was formed. (See Figure 8).

Then, the superimposed upper overlapping plate 34 is bent to the back surface plate 33a. Thereafter, the top side projecting portions 74 continuously provided on both left and right sides of the top portion 71 were joined to the body portion 72 . Hot melt was used for the joining.
In addition, the tip of the top side protruding part 74 is folded in the inner side direction of the paper container 90 with a zipper (downward before folding the top side protruding part 74), and the top side protruding part 74 and body part 72 are made easy to join.

When the top side protrusion 74 is joined to the trunk portion 72, the angle formed by the top side protrusion 71 and the top side protrusion 74 via the bent portion 76 of the top side protrusion 74 is approximately Right angle.

The completed substantially rectangular parallelepiped paper container was formed to have a width of 95 mm, a height of 120 mm, and a depth of 60 mm.
A zippered paper container 90 was produced as described above.

<Example 2>
In the present example, the position of the printed layer such as the pattern was different from that in Example 1 in the laminated sheet 78 of the blank plate 10 .

The laminated sheet 78 of the blank plate 10 of this embodiment has the following structure. FIG. 13A shows a cross-sectional view of the laminated sheet 78, but the printed layer such as a pattern is not shown.
(outer side)
Paper substrate protective layer 788 (stretched PET film 12 μm T4102 Toyobo) /
Pattern printed layer (gravure printing on the inner surface of the paper base protective layer 788) /
Intermediate adhesive layer 784 (LDPE 15 μm LC520 Japan polyethylene) /
Paper base layer 782 (base paper for liquid paper container 150 g/m ² Nippon Paper Industries) /
The innermost thermoplastic resin layer 783 (LDPE 30 μm LC520
Japan Polyethylene)
(inner side)

A method for manufacturing the laminated sheet 78 will be described.
First, a roll-shaped paper substrate protective layer 788 (stretched PET film of 12 μm) is fed out, and predetermined patterns and characters are gravure-printed at predetermined positions on the inner surface of the paper substrate protective layer 788, and then rolled again. was rolled up.

In the next step, a roll-shaped paper base layer 782 is unwound, and the outer surface of the paper base layer 782 is covered with the printed surface of the printed paper base protective layer 788 in the molten middle. It was laminated by extrusion lamination (sandwich lamination) with an adhesive layer 784 (LDPE 15 μm) in between.

Next, an innermost thermoplastic resin layer 783 (LDPE 30 μm) was formed on the inner surface of the paper base layer 782 by extrusion lamination.
Next, the laminated sheet 78 laminated by the above processing was rolled up into a roll.

Next, the roll-shaped laminated sheet 78 is unwound and subjected to ruled line processing, punching processing, and the like to complete the blank plate 10 .

The other layer structure of the laminated sheet 78 of the blank plate 10 and the shape of the blank plate 10 were the same as in Example 1. Furthermore, the manufacturing method from the blank plate 10 to the zippered paper container 90 was the same as in the first embodiment.

<Example 3>
In this example, the material of the paper base protective layer 788 of the laminated sheet 78 of the blank plate 10 was different from that in the second example.

The laminated sheet 78 of the blank plate 10 of this embodiment has the following structure. FIG. 13A shows a cross-sectional view of the laminated sheet 78, but the printed layer such as a pattern is not shown.
(outer side)
Paper base protective layer 788 (stretched polypropylene film 20 μm P-2171
Toyobo) /
Pattern printed layer (gravure printing on the inner surface of the paper base protective layer 788) /
Intermediate adhesive layer 784 (LDPE 15 μm LC520 Japan polyethylene) /
Paper base layer 782 (base paper for liquid paper container 150 g/m ² Nippon Paper Industries) /
The innermost thermoplastic resin layer 783 (LDPE 30 μm LC520
Japan Polyethylene)
(inner side)

Other than that, the position and shape of the printed layer such as the design of the blank plate 10 were the same as in the second embodiment. Also, the manufacturing method from the blank plate 10 to the paper container 90 with a zipper was the same as in the second embodiment.

<Example 4>
A feature of this embodiment is that the laminated sheet 78 is provided with a thermoplastic resin layer 781 on the outermost surface, which provides moisture resistance and antifouling properties from the outside. Also, when the top side protrusion 74 is bent and joined to the body part 72 and when the bottom side protrusion 75 is bent and joined to the bottom part 73, the heat of the outermost surface of the part concerned By heat-melting the plastic resin layer 781, heat sealing can be performed. In this case, no hot melt is required.

In this embodiment, the laminated sheet 78 of the blank plate 10 has the following structure. A cross-sectional view of the laminated sheet 78 is shown in FIG. 13B, but a printed layer such as a pattern is not shown.
(outer side)
Outermost thermoplastic resin layer 781 (LDPE 20 μm LC520
Japan Polyethylene) /
Paper substrate protective layer 788 (stretched PET film 12 μm T4102 Toyobo) /
Intermediate adhesive layer 784 (LDPE 15 μm LC520 Japan polyethylene) /
Pattern printed layer (gravure printing on the outer surface of the paper base layer 782) /
Paper base layer 782 (base paper for liquid paper container 150 g/m ² Nippon Paper Industries) /
The innermost thermoplastic resin layer 783 (LDPE 40 μm LC520
Japan Polyethylene)
(inner side)

A method for manufacturing the laminated sheet 78 will be described.
First, a roll-shaped paper base material layer 782 was unwound, and predetermined patterns and characters were gravure-printed at predetermined positions, and then rolled up again.

In the next step, the roll-shaped paper base layer 782 is unwound, and the outer surface of the paper base layer 782 is covered with a paper base protective layer 788 (stretched PET film of 12 μm) and a melted intermediate adhesive layer 784. Laminated by extrusion lamination (sandwich lamination) with (LDPE 15 μm) in the middle.

In the next step, a paper substrate protective layer 788 (stretched PET film, 12 μm) was formed on the outer surface, and an outermost thermoplastic resin layer 781 (LDPE, 20 μm) was formed by extrusion lamination.

In the next step, an innermost thermoplastic resin layer 783 (LDPE 30 μm) was formed on the inner surface of the paper base layer 782 by extrusion lamination.
Next, the laminated sheet 78 laminated by the above processing was rolled up into a roll.

Next, the roll-shaped laminated sheet 78 is unwound, and the blank plate 10 is completed by subjecting it to creasing, punching, and the like.

Other than that, the shape of the blank plate 10 was the same as in the first embodiment. In addition, the manufacturing method from the blank plate 10 to the chuck-equipped paper container 90 was the same as in the first embodiment.

<Example 5>
In this example, the material of the paper base protective layer 788 of the laminated sheet 78 of the blank plate 10 was different from that in the fourth example.

In this embodiment, the laminated sheet 78 of the blank plate 10 has the following structure. A cross-sectional view of the laminated sheet 78 is shown in FIG. 13B, but a printed layer such as a pattern is not shown.
(outer side)
Outermost thermoplastic resin layer 781 (LDPE 20 μm LC520
Japan Polyethylene) /
Paper substrate protective layer 788 (stretched nylon film 15 μm Emblem ON
Unitika /
Intermediate adhesive layer 784 (LDPE 15 μm LC520 Japan polyethylene) /
Pattern printed layer (gravure printing on the outer surface of the paper base layer 782) /
Paper base layer 782 (base paper for liquid paper container 150 g/m ² Nippon Paper Industries) /
The innermost thermoplastic resin layer 783 (LDPE 40 μm LC520
Japan Polyethylene)
(inner side)

In addition, the position of the printed layer such as the pattern of the laminated sheet 78 of the blank plate 10, the layer structure, the printing method, and the laminating method were the same as in Example 4. Also, the shape of the blank plate 10 was the same as that of the fourth embodiment. Furthermore, the manufacturing method from the blank plate 10 to the zippered paper container 90 was also the same as in the fourth embodiment.

<Example 6>
In the present example, the position of the printed layer such as the pattern was different from that of Example 4 in the laminated sheet 78 of the blank plate 10 .

In this embodiment, the laminated sheet 78 of the blank plate 10 has the following structure. A cross-sectional view of the laminated sheet 78 is shown in FIG. 13B, but a printed layer such as a pattern is not shown.
(outer side)
Outermost thermoplastic resin layer 781 (LDPE 20 μm LC520
Japan Polyethylene) /
Paper substrate protective layer 788 (stretched PET film 12 μm T4102 Toyobo) /
Pattern printed layer (gravure printing on the inner surface of the paper base protective layer 788) /
Intermediate adhesive layer 784 (LDPE 15 μm LC520 Japan polyethylene) /
Paper base layer 782 (base paper for liquid paper container 150 g/m ² Nippon Paper Industries) /
The innermost thermoplastic resin layer 783 (LDPE 40 μm LC520
Japan Polyethylene)
(inner side)

A method for manufacturing the laminated sheet 78 will be described.
First, a roll-shaped paper substrate protective layer 788 (stretched PET film of 12 μm) is fed out, and predetermined patterns and characters are gravure-printed at predetermined positions on the inner surface of the paper substrate protective layer 788, and then rolled again. was rolled up.

In the next step, a roll-shaped paper base layer 782 is unwound, and the outer surface of the paper base layer 782 is covered with the printed surface of the printed paper base protective layer 788 in the molten middle. It was laminated by extrusion lamination (sandwich lamination) with an adhesive layer 784 (LDPE 15 μm) in between.

In the next step, a paper substrate protective layer 788 (stretched PET film, 12 μm) was formed on the outer surface, and an outermost thermoplastic resin layer 781 (LDPE, 20 μm) was formed by extrusion lamination.

In the next step, an innermost thermoplastic resin layer 783 (LDPE 30 μm) was formed on the inner surface of the paper base layer 782 by extrusion lamination.
Next, the laminated sheet 78 laminated by the above processing was rolled up into a roll.

In the next step, the roll-shaped laminated sheet 78 is unwound and subjected to creasing, punching, and the like to complete the blank plate 10 .

Other shapes of the blank plate 10 were the same as those of the fourth embodiment. Furthermore, the manufacturing method from the blank plate 10 to the zippered paper container 90 was also the same as in the fourth embodiment.

<Example 7>
In this example, in the laminated sheet 78 of the blank plate 10, the position of the printed layer such as the pattern was different from that in the fourth and sixth examples. The other layer structure, shape, and manufacturing method from the blank plate 10 were the same as in Example 4.

In this embodiment, the laminated sheet 78 of the blank plate 10 has the following structure. A cross-sectional view of the laminated sheet 78 is shown in FIG. 13B, but a printed layer such as a pattern is not shown.
(outer side)
Pattern printed layer (gravure printing on the outer surface of the outermost thermoplastic resin layer 781) /
Outermost thermoplastic resin layer 781 (LDPE 20 μm LC520
Japan Polyethylene) /
Paper substrate protective layer 788 (stretched PET film 12 μm T4102 Toyobo) /
Intermediate adhesive layer 784 (LDPE 15 μm LC520 Japan polyethylene) /
Paper base layer 782 (base paper for liquid paper container 150 g/m ² Nippon Paper Industries) /
The innermost thermoplastic resin layer 783 (LDPE 40 μm LC520
Japan Polyethylene)
(inner side)

A method for manufacturing the laminated sheet 78 will be described.
First, a roll-shaped paper base layer 782 is unwound, and a paper base protective layer 788 is placed on the outer surface of the paper base layer 782 with a melted intermediate adhesive layer 784 (LDPE 15 μm) interposed in the middle. , laminated by extrusion lamination (sandwich lamination).

In the next step, a paper substrate protective layer 788 (stretched PET film, 12 μm) was formed on the outer surface, and an outermost thermoplastic resin layer 781 (LDPE, 20 μm) was formed by extrusion lamination.

In the next step, a laminate sheet 78 having an innermost thermoplastic resin layer 783 (LDPE 30 μm) formed on the inner surface of the paper base layer 782 by extrusion lamination was wound up into a roll.

In the next step, the laminated sheet 78 is fed out, and predetermined patterns and characters are gravure-printed at predetermined positions on the outer surface of the outermost thermoplastic resin layer 781 (LDPE 20 μm) of the laminated sheet 78. , was rolled up again.

In the next step, the printed roll-shaped laminated sheet 78 is unwound and subjected to ruled line processing, punching processing, etc., and the blank plate 10 is completed.

Other shapes of the blank plate 10 were the same as those of the fourth embodiment. Furthermore, the manufacturing method from the blank plate 10 to the zippered paper container 90 was also the same as in the fourth embodiment.

<Example 8>
In this embodiment, a barrier layer 785 is provided to impart an oxygen barrier property to the laminated sheet 78 .

In this embodiment, the laminated sheet 78 of the blank plate 10 has the following structure. FIG. 13C shows a cross-sectional view of the laminated sheet 78, but the printed layer such as a pattern is not shown.
(outer side)
Paper substrate protective layer 788 (stretched PET film 12 μm T4102 Toyobo) /
Intermediate adhesive layer 784 (LDPE 15 μm LC520 Japan polyethylene) /
Pattern printed layer (gravure printing on the outer surface of the paper base layer 782) /
Paper base layer 782 (base paper for liquid paper container 150 g/m ² Nippon Paper Industries) /
Intermediate adhesive layer 784 (EMAA 20 μm Mitsui Dow Polychemical N0908N) /
Barrier layer 785 (silica deposition PET 12 μm Dai Nippon Printing IB-PET-UBP) /
The innermost thermoplastic resin layer 783 (LDPE 30 μm LC520
Japan Polyethylene)
(inner side)

A method for manufacturing the laminated sheet 78 will be described.
First, a roll-shaped paper base material layer 782 was unwound, and predetermined patterns and characters were gravure-printed at predetermined positions, and then rolled up again.

In the next step, the roll-shaped paper base layer 782 is unwound, and a paper base protective layer 788 (stretched PET film, 12 μm) is formed on the outer surface of the paper base layer 782 to form a molten intermediate adhesive layer. 784 (LDPE 15 μm) in the middle and laminated by extrusion lamination (sandwich lamination).

In the next step, an innermost thermoplastic resin layer 783 (LDPE 30 μm) was formed on the inner surface of the paper base layer 782 by extrusion lamination.
Next, the laminated sheet laminated by the above process was rolled up into a roll.

In the next step, the roll-shaped laminated sheet is unwound, and the inner surface of the paper base layer 782 is coated with a barrier layer 785 (silica deposition PET 12 μm) and a molten intermediate adhesive layer 784 (EMAA 20 μm). It was laminated by extrusion lamination (sandwich lamination) with an intermediate interposition.

In the next step, an innermost thermoplastic resin layer 783 (LDPE 30 μm) was formed on the inner surface of the barrier layer 785 by extrusion lamination.
Next, the laminated sheet 78 laminated by the above processing was rolled up into a roll.

In the next step, the roll-shaped laminated sheet 78 is unwound and subjected to creasing, punching, and the like to complete the blank plate 10 .

Other shapes of the blank plate 10 were the same as those of the first embodiment. Furthermore, the manufacturing method from the blank plate 10 to the zippered paper container 90 was the same as in the first embodiment.

<Comparative Example 1>
In this comparative example, the laminated sheet 88 of the blank plate 81 has the following configuration. FIG. 5B shows a cross-sectional view of the laminated sheet 88, but a printed layer such as a pattern is not shown.
(outer side)
Pattern printed layer (gravure printing on the outer surface of the paper base layer 882) /
Paper base layer 882 (base paper for liquid paper container 150 g/m ² Nippon Paper Industries) /
The innermost thermoplastic resin layer 883 (LDPE 30 μm LC520
Japan Polyethylene)
(inner side)

The manufacturing method of the laminated sheet 88 is the manufacturing method of Example 1 except that the paper substrate protective layer 788 and the intermediate adhesive layer 784 are laminated.

<Comparative Example 2>
In this comparative example, the laminated sheet 88 of the blank plate 81 has the following configuration. FIG. 5A shows a cross-sectional view of the laminated sheet 88, but a printed layer such as a pattern is not shown.
(outer side)
Outermost thermoplastic resin layer 881 (LDPE 20 μm LC520
Japan Polyethylene)
Pattern printed layer (gravure printing on the outer surface of the paper base layer 882) /
Paper base layer 882 (base paper for liquid paper container 150 g/m ² Nippon Paper Industries) /
The innermost thermoplastic resin layer 883 (LDPE 30 μm LC520
Japan Polyethylene)
(inner side)

The method for manufacturing the laminated sheet 88 described above is a method in which the thermoplastic resin layer 881 as the outermost layer is added to the manufacturing method of Comparative Example 1. FIG. The method for laminating the outermost thermoplastic resin layer 881 is the same as the method described in the fourth embodiment.

<Comparative Example 3>
In this comparative example, in the laminated sheet 78 of the blank plate 10, the position of the printed layer such as the pattern was different from that in the second comparative example. The other layer structure, shape, and manufacturing method from the blank plate 81 were the same as in Comparative Example 2.
In this comparative example, the laminated sheet 78 of the blank plate 10 was configured as follows. FIG. 5A shows a cross-sectional view of the laminated sheet 88, but a printed layer such as a pattern is not shown.
(outer side)
Pattern printed layer (gravure printing on the outer surface of the outermost thermoplastic resin layer 781) /
Outermost thermoplastic resin layer 781 (LDPE 20 μm LC520
Japan Polyethylene)
Paper base layer 782 (base paper for liquid paper container 150 g/m ² Nippon Paper Industries) /
The innermost thermoplastic resin layer 783 (LDPE 30 μm LC520
Japan Polyethylene)
(inner side)

The manufacturing method of the laminated sheet 88 described above is the manufacturing method of Example 7 except that the paper substrate protective layer 788 and the intermediate adhesive layer 784 are laminated.

<Comparative Example 4>
In this comparative example, in the laminated sheet 88 of the blank plate 81, a barrier layer 885 was provided to impart oxygen barrier properties, and an intermediate adhesive layer 884 was provided to laminate the barrier layer 885. was the same as 1. The other layer structure, shape, and manufacturing method from the blank plate 81 were the same as in Comparative Example 1.

In this comparative example, the laminated sheet 88 of the blank plate 81 has the following configuration. FIG. 5D shows a cross-sectional view of the laminated sheet 88, but the printed layer such as a pattern is not shown.
(outer side)
Pattern printed layer (gravure printing on the outer surface of the paper base layer 882) /
Paper base layer 882 (base paper for liquid paper container 150 g/m ² Nippon Paper Industries) /
Intermediate adhesive layer 884 (EMAA 20 μm Mitsui Dow Polychemical N0908N) /
Barrier layer 885 (silica deposition PET 12 μm Dai Nippon Printing IB-PET-UBP) /
The innermost thermoplastic resin layer 883 (LDPE 30 μm LC520
Japan Polyethylene)
(inner side)

The manufacturing method of the laminated sheet 88 is the manufacturing method of Example 8 except that the paper substrate protective layer 788 and the intermediate adhesive layer 784 are laminated.
<Evaluation>
Fifty samples each of Examples 1 to 8 and Comparative Examples 1 to 4 were produced.

In Comparative Examples 1 to 4, damages (cracks) 879 occurred in the laminated sheet 88 at the folded portion 876 of the top side protrusion 874 of the paper container 80 with zipper.
In Comparative Examples 2 and 3, a polyethylene layer was provided as the outermost thermoplastic resin layer 781 outside the paper base layer 882, but cracks (damage) 879 occurred.

This is because the tensile strength and tensile modulus of the material of the paper substrate protective layer 788 of the present disclosure are higher than those of polyethylene.
The tensile strength and tensile elastic modulus can be measured according to the following standards. JIS K7161-1:2014, JIS K7172:1999, JIS K6922-2:2018, JIS C2318:2020 and the like.

In Examples 1 to 8, the laminated sheet 78 at the folded portion 76 of the top side projecting portion 74 of the zipper-equipped paper container 90 did not deteriorate in appearance due to damage (cracking) or the like.
This is because when the top side protruding portions 74 connected to the left and right sides of the top portion 71 of the paper container 90 with a zipper are joined to the body portion 72 of the paper container 90 with a zipper, the top portion is The paper base layer 782 of the laminated sheet 78 at the bent portion 76 of the projecting portion 74 is protected by a paper base protective layer 788 provided on any layer of the outer side. Therefore, the bent portion 76 of the top side projecting portion 74 of the paper base layer 782 is not greatly stretched, and damage (cracking) is unlikely to occur.

Snacks were filled from the bottom 73 into the paper containers 92 with zippers (upright state) in the intermediate stages of Examples 1 to 8 produced as described above. The seal margins 37 are heat-sealed, and the heat-sealed portion is laid down in the direction of the back bottom plate 35a.

Furthermore, the bottom side protruding portions 75 projecting from both the left and right sides of the bottom portion 73 are bent to the side of the bottom plate 35, and joined to the front side bottom plate 35b and/or the front side bottom side seal allowance 37b, Packages of substantially rectangular parallelepiped zippered paper containers 90 of Examples 1 to 8 were produced.

In addition, the packages of paper containers with zippers 90 of Examples 1 to 8 manufactured as described above were tested for unsealability, suitability for taking out the contents, and resealability with a zipper.

As a result, both the notch 77 provided as an initial unsealing means in the side plate 41 of the top and the easy-to-open processing line 51 provided in the upper overlapping plate 34 and the side plate 41 of the top allow easy opening. It was possible to cut off the upper part of the easy-open processing line 51 and open it.

Next, the front side opening gripping margin 57b between the front side easy-open processing line 51b and the front side zipper tape 61b and the back side between the back side easy-open processing line 51a and the back side zipper tape 61a are The unsealing gripping margin 57a was gripped by human hands, and spread in the outer side direction of the paper container 90 with a zipper.

As a result, the fitting of the zipper tape 61 exposed at the easy-open processing line 51 is easily released, and the upper portion of the paper container 90 with a zipper is opened over substantially the entire width, forming an opening 56 for removal. rice field. The snacks filled inside could be easily taken out through the take-out opening 56 .

Moreover, after part of the contents were taken out, the zipper tapes 61 were easily refitted and resealed in the packages of the zippered paper containers 90 of Examples 1 to 8. FIG. The remaining contents were then properly preserved.

Furthermore, the chuck-equipped paper container 90 of the present disclosure satisfies 51% by mass or more, which is the standard for a paper container, in terms of the mass ratio of paper to the overall weight of the chuck-equipped paper container 90 .

10 Blank plate 10a Back side blank plate 10b Front side blank plate 11 Side edge 12 First vertical folding line 13 Second vertical folding line 14 Second vertical folding virtual line 15 Top side projection folding line 17 Top Side diagonal fold line 18 Bottom side diagonal fold line 21 Upper edge 22 First horizontal fold line 23 Second horizontal fold line 24 Third horizontal fold line 25 Fourth horizontal fold line 26 Lower edge 31 Wall plate 32 Side plate 33 Top plate 34 Upper overlapping plate 35 Bottom plate 36 Side edge seal allowance 37 Bottom seal allowance 38 Top side protrusion allowance 41 Top side plate 43 Bottom side protrusion allowance 51 Easy opening Processing line 52 Zipper tape joining portion 53 Upper seal portion 56 Extraction opening 57 Unsealing gripping margin 61 Zipper tape 61m Male zipper tape 61f Female zipper tape 62 Zipper tape body 62m Male zipper tape body 62f Female zipper tape Body portion 63 Zipper tape fitting portion 63m Male zipper tape fitting portion 63f Female zipper tape fitting portion 71 Top portion of paper container with zipper 72 Body portion of paper container with zipper 72d Edge of body portion 73 Paper with zipper Container bottom 74 Top side protrusion 75 Bottom side protrusion 76 Top side protrusion bent portion 77 Notch 78 Laminated sheet 781 Outermost thermoplastic resin layer 782 Paper base layer 783 Innermost thermoplastic layer Resin layer 784 Intermediate adhesive layer 785 Barrier layer 788 Paper substrate protective layer 80 Prior art zippered paper container 81 Prior art blank plate 81a Prior art back side blank plate 81b Prior art front side blank plate 812 Prior art The first vertical fold line 821 of the prior art intermediate horizontal fold line (half fold line)
831 prior art wall plate 832 prior art side plate 833 prior art top plate 834 prior art top stack plate 835 prior art bottom plate 836 prior art side edge edge seal allowance 837 prior art bottom edge plate Seal allowance 838 Conventional technology ceiling side protrusion allowance 843 Conventional technology top side plate 851 Conventional technology easy-to-open processing line 856 Conventional technology extraction opening 861 Conventional technology chuck tape 871 Conventional technology zipper Top part 872 of paper container with zipper Body part 873 of paper container with zipper of prior art Bottom part 874 of paper container with zipper of prior art 88 Prior Art Laminated Sheet of Paper Container 881 Prior Art Outermost Thermoplastic Resin Layer 882 Prior Art Paper Base Layer 883 Prior Art Innermost Thermoplastic Resin Layer 884 Prior Art Intermediate Adhesive Layer 885 Prior Art Barrier layer 90 Zippered paper container 91 of the present disclosure Intermediate zippered paper container of the present disclosure (flat state)
92 Paper container with zipper in the intermediate stage of the present disclosure (folding state)

A Cutting position of the cross-sectional view of the folded portion of the top side protrusion of the zipper-equipped paper container of the prior art B Cutting position of the cross-sectional view of the folded portion of the top side protrusion of the zipper-equipped paper container of the present disclosure C Chuck Cutting position of the enlarged cross-sectional view of the tape joint

E 1st top intersection (intersection of the 1st vertical fold line and the 1st horizontal fold line)
F Second top intersection (intersection of second vertical fold line and second horizontal fold line)
G 1st bottom intersection (intersection of 1st vertical fold line and 4th horizontal fold line)
H second bottom intersection (intersection of second vertical fold line and third horizontal fold line)

Claims (7)

In a zippered paper container in which a blank plate made of a laminated sheet containing a paper base layer is assembled,
The blank plate includes at least a front side blank plate and a back side blank plate,
An upper overlapping plate for superimposing and joining the front side blank plate and the back side blank plate on the upper part of the paper container with a zipper, and a lower side of the upper overlapping plate connected to the upper side. a top portion comprising a top plate;
a side plate of the top portion connected to both left and right sides of the upper overlapping plate;
a top side protruding part continuously provided on both left and right sides of the top part;
a trunk provided on the underside of the top;
a bottom provided on the underside of the torso;
an upper seal portion that traverses the upper overlapping plate and the upper edge portion of the side plate of the top portion or the vicinity of the upper edge portion;
a zipper tape positioned below the upper sealing portion and crossing the upper overlapping plate and the side plate of the top portion;
A paper container with a zipper, wherein at least the laminated sheet of the front side blank plate has a paper base protective layer on one of the layers of the outer side of the paper base layer. 2. The zippered paper container according to claim 1, wherein said paper substrate protective layer is a film having a higher tensile strength than polyethylene. 3. A paper container with a zipper according to claim 1 or 2, wherein said paper substrate protective layer is a film having a higher tensile modulus than polyethylene. The zippered paper container according to any one of claims 1 to 3, wherein the paper substrate protective layer is an oriented polyethylene terephthalate film. The paper container with zipper according to any one of claims 1 to 3, wherein the paper substrate protective layer is a stretched nylon film. The paper container with zipper according to any one of claims 1 to 3, wherein the paper substrate protective layer is an oriented polypropylene film. The paper container with a zipper according to any one of claims 1 to 6, wherein the paper substrate protective layer has a thickness of 10 µm or more and 200 µm or less.

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