Paper container with a chuck

Abstract

To provide a paper container 90 with a chuck in which when the paper container 90 with the chuck is placed on a table or the like, the placement state is stabilized because a portion near an outer peripheral part of a bottom part 73 is in contact with the table or the like and the inside of the bottom part 73 is not in contact with the table or the like.SOLUTION: A bottom part 73 of a paper container 90 with a chuck includes a bottom face part 731 and a bottom part-side protruding part 75. The bottom face part 731 has a concave shape when viewed from below. The bottom part-side protruding part 75 is bonded to the bottom face part 731.SELECTED DRAWING: Figure 11A

Description

Technical Field

[0001] The present disclosure relates to a paper container having a three-dimensional shape and self-standing properties, in which the male and female fitting portions of a chuck tape are disengaged, the chuck tape is opened, and the contents can be taken out. After use, the male and female fitting portions of the chuck tape can be joined to reseal, and it relates to a paper container with a chuck.

Background Art

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

[0003] With the above technique, it is possible to protect the contents and prevent the contents from spilling when the paper container is overturned. Also, since it is a paper container, it is easy to reduce the volume of the container after the contents are consumed and to discard it.

[0004] In the paper container with a chuck described in Patent Document 1, a bottom ridge protrusion is joined to the bottom surface portion. However, when the bottom ridge protrusion is joined to the bottom, if the shape formed by the joining of the bottom ridge protrusion and the bottom surface portion is not appropriate, there is a risk that the paper container with a chuck will fall unstably when placed on a table or the like.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0006] The present disclosure has been made to solve the above problems, and the problem is to provide a paper container with a chuck that is stable when placed on a table or the like, because when the bottom bulge is joined to the bottom surface portion in the paper container with a chuck, the bottom bulge and the bottom surface portion are joined in an appropriate shape.

Means for Solving the Problems

[0007] The above problems can be solved by the following embodiments of the present disclosure. That is, the paper container 90 with a chuck of the present disclosure In the paper container 90 with a chuck in which a blank plate 10 made of a laminated sheet 78 including a paper base material layer 782 is assembled, The blank plate 10 includes at least an outer blank plate 10b and an inner blank plate 10a, At the upper part of the paper container 90 with a chuck, a top part 71 composed of an upper overlapping plate 34 in which the outer blank plate 10b and the inner blank plate 10a are overlapped and joined, and a top plate 33 continuously provided under the upper overlapping plate 34, Side plates 41 of the top part continuously provided on both left and right sides of the upper overlapping plate 34, Top part bulges 74 continuously provided on both left and right sides of the top part 71, A body part 72 provided under the top part 71, A bottom part 73 provided under the body part 72, An upper seal part 53 that crosses the upper edge part 21 or the vicinity of the upper edge part 21 of the upper overlapping plate 34 and the side plates 41 of the top part, An easy-open processing line 51 that is located under the upper seal part 53 and crosses the upper overlapping plate 34 and the side plates 41 of the top part, A chuck tape 61 that is located under the easy-open processing line 51 and crosses the upper overlapping plate 34 and the side plates 41 of the top part, The bottom part 73 includes a bottom surface part 731 and a bottom bulge 75, The bottom surface part 731 has a concave shape when viewed from below, The bottom bulge 75 is joined to the bottom surface portion 731.

[0008] Also, the paper container 90 with a chuck of the present disclosure The bottom seal margin 37 of the bottom bulge 75 and the bottom seal margin 37 of the bottom surface portion 731 may be joined.

[0009] Also, the paper container 90 with a chuck of the present disclosure It may be joined to the bottom surface portion 731 at the tip of the bottom bulge 75.

[0010] Also, the paper container 90 with a chuck of the present disclosure The bottom bulge 75 may have an inclination that becomes upward from the outside to the inside in the width direction of the paper container 90 with a chuck.

[0011] Also, the paper container 90 with a chuck of the present disclosure The bottom bulge 75 may be convex when viewed from the bottom in the width direction of the paper container 90 with a chuck.

[0012] Also, the paper container 90 with a chuck of the present disclosure The bottom bulge 75 may be concave when viewed from the bottom in the width direction of the paper container 90 with a chuck.

[0013] Also, the paper container 90 with a chuck of the present disclosure The distance between the bottom bulge 75 and the bottom surface portion 731 may be the largest in the intermediate region between the bent portion 79 of the bottom bulge 75 of the bottom 73 and the joining portion of the bottom bulge 75 and the bottom surface portion 731 in the width direction of the paper container 90 with a chuck.

[0014] Also, the paper container 90 with a chuck of the present disclosure It may have a tip bent portion 751 extending in the front-rear direction of the paper container 90 with a chuck near the tip of the bottom bulge 75.

Advantages of the Invention

[0015] According to the embodiment of the present disclosure described above, when the bottom gusset protrusion 75 of the paper container 90 with a chuck is joined to the bottom surface portion 731, the bottom gusset protrusion 75 and the bottom surface portion 731 are joined in an appropriate shape, so that when placed on a table or the like, a stable paper container 90 with a chuck can be provided.

Brief Description of the Drawings

[0016]

Figure 1A

Figure 1B

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Figure 11A

Figure 11B

Figure 11C

Figure 11D

Figure 12

Figure 13

Figure 14A

Figure 14B

Figure 14C

Figure 14D

Figure 15A

Figure 15B

Figure 16A

Figure 16B

Figure 17

Figure 18

Figure 19

Figure 20

Embodiments for Carrying Out the Invention

[0017] Hereinafter, the present disclosure will be described with reference to the drawings. However, the present disclosure is not limited to these specifically shown forms and various specifically described structures. In each drawing, for the sake of clarity, the size and ratio of the members may be changed or exaggerated. Also, for the sake of visibility, parts that are not necessary for explanation and repeated reference numerals may be omitted.

[0018] Also, the numerical values such as the dimensions of each member described in this specification and the material names are examples as embodiments, and are not limited thereto, and can be appropriately selected and used. In this specification, terms specifying shapes and geometric conditions, such as terms like parallel, orthogonal, and perpendicular, include not only the strictly meant states but also substantially the same states.

[0019] The blank plate 10 of the paper container 90 with a chuck of the present disclosure is formed with a rectangular outer shape using a laminated sheet 78 in which at least a base paper is laminated and at least a heat-adhesive resin such as polyethylene is laminated as the innermost layer. Also, various folding lines provided in the blank plate 10 partition the forming plates of each part necessary for forming the paper container 90 with a chuck.

[0020] <The First Embodiment of the Present Disclosure> <Blank Plate> The blank plate 10 of the paper container 90 with a chuck according to this embodiment is shown in FIGS. 1A and 1B. FIG. 1A represents the back blank plate 10a, and FIG. 1B represents the front blank plate 10b. Note that the two sheets of the back blank plate 10a and the front blank plate 10b are collectively referred to as the blank plate 10.

[0021] Also, unless otherwise specified, in each component of the blank plate 10 described later, the subscript a of each reference sign indicates an element of the back blank plate 10a, and the subscript b indicates an element of the front blank plate 10b. In an element having both subscripts a and b, the reference sign without a subscript may include both a and b.

[0022] Here, the back upper edge portion 21a, which is the bottom of the drawing of the back blank plate 10a in FIG. 1A, becomes the top of the paper container 90 with a chuck. Also, the front upper edge portion 21b, which is the top of the drawing of the front blank plate 10b in FIG. 1B, becomes the top of the paper container 90 with a chuck.

[0023] In both FIGS. 1A and 1B, the front surface of the drawing becomes the outer surface when the paper container 90 with a chuck is assembled, and the back surface becomes the inner surface. FIGS. 1A and 1B are line-symmetric with respect to the respective upper edge portions 21a and 21b. When the inner surfaces of the back blank plate 10a and the front blank plate 10b are aligned and overlapped, each component (each forming plate, line, seal portion, chuck tape joint portion, etc. described later) overlaps.

[0024] The above-mentioned back blank plate 10a and front blank plate 10b that are aligned and overlapped are joined to produce a paper container with a chuck (flat state) 91 at an intermediate stage as shown in FIG. 2, and further a paper container with a chuck (raised state) 92 at an intermediate stage as shown in FIG. 3 is produced, and the procedure proceeds toward the completion of the paper container 90 with a chuck. This manufacturing method will be described later.

[0025] Unless otherwise specified hereinafter, with reference to FIG. 1B, the top, bottom, left, and right of the front blank plate 10b are indicated. For the back blank plate 10a as well, the upper edge portion 21a is defined as the top and will be described accordingly. Therefore, in FIG. 1A, the up and down directions are reversed. For the paper container 90 with a chuck as well, the upper edge portion 21 is defined as the top and the lower edge portion 26 is defined as the bottom.

[0026] Note that FIG. 4 shows the formed paper container 90 with a chuck, which is sequentially composed of a top portion 71, a body portion 72, and a bottom portion 73 from the top. The above-mentioned top may also be referred to as the top side and the bottom may be referred to as the bottom side. Also, when explaining the up and down directions of each component provided on the top portion 71, the description of the top side indicates the upper edge portion 21, and when explaining the up and down directions of each component provided on the bottom portion 73, the description of the bottom side may indicate the lower edge portion 26. Note that unless otherwise specified hereinafter, with reference to FIG. 4, with the front wall plate 31b of the front side as the front, the front, back, left, right, top, and bottom of the paper container 90 with a chuck are indicated. The same applies to the paper container 80 with a chuck in a comparative example, for example, which will be described in detail later.

[0027] As described above, since the back blank plate 10a and the front blank plate 10b are substantially line-symmetric in shape vertically, the description of the blank plate 10 will be given with the front blank plate 10b. Also, the back blank plate 10a and the front blank plate 10b have the same material (layer structure) and manufacturing method.

[0028] The front blank plate 10b of the paper container 90 with a chuck in this embodiment is formed with an outer shape that is substantially rectangular using a laminated sheet 78 obtained by laminating at least a base paper and laminating a thermoplastic resin such as polyethylene as at least the innermost layer. With reference to FIG. 1B, the top is defined as the front upper edge portion 21b, both the left and right sides are defined as the front side edge portions 11b, and the bottom is defined as the front lower edge portion 26b. Also, the front blank plate 10b has a left-right symmetric shape with a vertical line passing through the central portion in its width direction as the symmetry line. The laminated sheet 78 will be described later.

[0029] On the front blank plate 10b, a first front horizontal folding line 22b, a second front horizontal folding line 23b, a third front horizontal folding line 24b, and a fourth front horizontal folding line 25b that sequentially exist in the transverse direction are provided from the upper edge portion 21b of the front surface. It is desirable that these front horizontal folding lines 22b, 23b, 24b, and 25b are each parallel to the upper edge portion 21b and the lower edge portion 26b of the front surface.

[0030] On the front blank plate 10b, a first front vertical folding line 12b that longitudinally cuts, a second front vertical folding line 13b, a second front vertical folding line 13b, and a first front vertical folding line 12b are provided sequentially from the left side. That is, the vertical folding line closer to the side edge portion 11b of each front blank plate 10b is the first front vertical folding line 12b, and the vertical folding line farther from the side edge portion 11b of the front blank plate 10b is the second front vertical folding line 13b. It is desirable that these front vertical folding lines 12b and 13b are substantially parallel to the side edge portion 11b of the front blank plate 10b.

[0031] Furthermore, a pair of front top inclined folding lines 17b and a pair of front bottom inclined folding lines 18b are provided on the left and right, respectively, and the forming plates of each part necessary for forming the paper container 90 with a chuck are partitioned and configured.

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

[0033] The outer surface bottom diagonal fold line 18b starts from the outer surface second bottom intersection Hb, which is the intersection of the outer surface second vertical fold line 13b and the outer surface third horizontal fold line 24b. Further, the outer surface bottom diagonal fold line 18b connects the above-mentioned outer surface second bottom intersection Hb and the outer surface first bottom intersection Gb, which is the intersection of the outer surface first vertical fold line 12b and the outer surface fourth horizontal fold line 25b, and further extends to the outer surface side edge portion 11b. And the intersection of the outer surface side edge portion 11b and the outer surface bottom diagonal fold line 18b is the end point of the outer surface bottom diagonal fold line 18b.

[0034] Note that the outer surface top diagonal fold line 17b may be located in the vicinity without being in contact with the outer surface second top intersection Fb. Further, the outer surface bottom diagonal fold line 18b may be located in the vicinity without being in contact with the outer surface second bottom intersection Hb.

[0035] Also, the outer surface top diagonal fold line 17b is not in contact with the outer surface first top intersection Eb, and there may be no vicinity thereof. Alternatively, there may be no existence between the outer surface first top intersection Eb and the outer surface side edge portion 11b for the outer surface top diagonal fold line 17b. Further, the outer surface bottom diagonal fold line 18b is not in contact with the outer surface first bottom intersection Gb, and there may be no vicinity thereof. Alternatively, there may be no existence between the outer surface first bottom intersection Gb and the outer surface side edge portion 11b for the outer surface bottom diagonal fold line 18b.

[0036] By the above-mentioned outer surface diagonal fold lines and each intersection being located in the vicinity without being in contact, it has sufficient folding performance, and there is no excessive concentration of fold lines at specific locations, and it is possible to prevent a decrease in the strength of the laminated sheet of the outer surface blank plate 10b.

[0037] On the side edge portions 11b on both left and right sides of the outer surface blank plate 10b, an outer surface side edge seal margin 36b is formed via the outer surface first vertical fold line 12b.

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

[0039] Further, on the front blank plate 10b, forming plates of respective portions are sequentially provided in a downward direction from the front upper edge portion 21b located at the uppermost front surface.

[0040] Regarding the main part, a front upper overlapping plate 34b is provided below the central region of the front upper edge portion 21b. Below the front upper overlapping plate 34b, a front top plate 33b is continuously provided via the front first folding line 22b. Below the front top plate 33b, a front wall plate 31b is continuously provided via the front second folding line 23b. Below the front wall plate 31b, a front bottom plate 35b is continuously provided via the front third folding line 24b.

[0041] Further, on the outer sides of both the left and right sides of the front upper overlapping plate 34b, side plates 41b of the front top are continuously provided via the front second vertical folding line 13b.

[0042] Further, on the outer sides of both the left and right sides of the front top plate 33b, front top protruding margin 38b is continuously provided via the front second vertical folding line 13b.

[0043] Further, on the outer sides of both the left and right sides of the front wall plate 31b, side plates 32b of the front side are continuously provided via the front second vertical folding line 13b.

[0044] Further, on the outer sides of both the left and right sides of the front bottom plate 35b, front bottom protruding margin 43b is continuously provided via the front second vertical folding line 13b.

[0045] Further, on the lower portion of the side plate 41b of the front surface top portion, a front surface top portion protruding portion substitute 38b is continuously provided via a front surface first horizontal folding line 22b. On the lower portion of the front surface top portion protruding portion substitute 38b, a front surface side plate 32b is continuously provided via a front surface second horizontal folding line 23b. On the lower portion of the front surface side plate 32b, a front surface bottom portion protruding portion substitute 43b is continuously provided via a front surface third horizontal folding line 24b.

[0046] On the lower portion of the above-mentioned front surface bottom plate 35b and on the lower portions of the front surface bottom portion protruding portion substitutes 43b on both the left and right sides thereof, a bottom portion seal substitute 37b is continuously provided.

[0047] On the left and right outer sides of the above-mentioned front surface top portion side plate 41b, the front surface top portion protruding portion substitute 38b, the front surface side plate 32b, and the front surface bottom portion protruding portion substitute 43b, a front surface side edge portion seal substitute 36b is continuously provided via a front surface first vertical folding line 12b.

[0048] The process of imparting folding lines (ruling) to the blank plate 10 of the present embodiment is carried out by ruling after the laminated sheet 78 is completed, and then the laminated sheet is supplied to a machine for manufacturing the paper container 90 with a chuck. Alternatively, the ruling may be carried out by a machine for manufacturing the paper container 90 with a chuck.

[0049] As a method of ruling, an appropriate method is adopted from known methods such as the platen method and the rotary die method. Also, before carrying out the ruling, the laminated sheet 78 may be cut into sheets. Alternatively, the laminated sheet 78 may be supplied in a roll form to the ruling process.

[0050] Next, the punching process of manufacturing the blank plate 10 by punching the laminated sheet 78 will be described. For the punching process, an appropriate method is selected from known methods such as the platen method and the rotary die method. The blank plate 10 may be directly formed from the roll-shaped laminated sheet 78, or it may be cut into individual sheets first and then punched. Also, the order of the ruling process and the punching process does not matter. They may be processed simultaneously.

[0051] Alternatively, a roll-shaped laminated sheet 78 slit to a predetermined roll width may be supplied to a machine for manufacturing a paper container 90 with a chuck, cut in the transverse direction of the roll-shaped laminated sheet 78, and a blank plate 10 may be produced.

[0052] Note that the back blank plate 10a is symmetric with respect to the line and has the same shape as the front blank plate 10b. In other words, it is a blank plate of substantially the same shape with the layer configuration of the blank plate reversed.

[0053] FIG. 2 is a front view showing the shape of a paper container 90 with a chuck (in a planar state) at an intermediate stage when manufacturing the paper container 90 with a chuck using the blank plate 10 shown in FIGS. 1A and 1B. The uppermost part is the upper edge 21b of the front blank plate 10b shown in FIG. 1B, and on the back side thereof, a back blank plate 10a is provided. Although the back blank plate 10a cannot be seen visually, when seen through, it has substantially the same shape as the front blank plate 10b.

[0054] Note that in FIG. 2, the back blank plate 10a and the front blank plate 10b overlap, and each component has the same positional relationship when the drawing is seen through within the range of manufacturing variations. Therefore, the front notations and subscripts may be omitted during the explanation.

[0055] On the upper overlapping plate 34 and the side plate 41 of the front top portion, an upper seal portion 53, an easy-open processing line 51, and a chuck tape joint portion 52 as transverse sealing means are sequentially provided at predetermined positions where the two blank plates 10 overlap each other, starting from the upper edge 21 side.

[0056] The upper seal portion 53 is provided at the upper edge 21 of the upper overlapping plate 34 and the side plate 41 of each top portion, or at a position spaced apart from the upper edge 21 in the vicinity. Note that when the upper seal portion 53 is substantially parallel to the upper edge 21, the length of the upper seal portion 53 can be shortened, and there is no waste in the blank plate 10.

[0057] The upper seal part 53 as the transverse sealing means is formed by joining the front upper seal part 53b and the back upper seal part 53a that are to face each other. Since the joining is made to cross the upper edge part 21 of the paper container 90 with a chuck or the vicinity of the upper edge part 21 over the entire width, the paper container 90 with a chuck is kept sealed.

[0058] Also, the easy-open processing line 51 is preferably substantially parallel to the upper edge part 21. In such a form, the easy-open processing line 51 can be easily cut. Also, the length of the easy-open processing line 51 can be shortened.

[0059] Furthermore, the chuck tape joint part 52 is preferably substantially parallel to the upper edge part 21. In such a form, the opening and closing of the chuck tape 61 and the taking out of the contents become easy. Also, the length of the chuck tape 61 can be shortened.

[0060] <Easy-open processing line> The easy-open processing line 51 will be described. A front easy-open processing line 51b as an opening means may be provided on the front upper overlapping plate 34b and the side plates 41b of the front top parts on both the left and right sides. By providing the easy-open processing line 51b, the paper container 90 with a chuck can be opened without using tools such as scissors.

[0061] As shown in FIG. 2, the front easy-open processing line 51b extends from one front side edge part 11b of the front blank plate 10b to the other front side edge part 11b and exists between the front upper seal part 53b and the chuck tape 61.

[0062] Note that a notch 77 may be provided at either end of the easy-open processing line 51. In this embodiment, the notch 77 is provided at the right side edge part 11. Also, the notch 77 may be provided at the left side edge part 11. Alternatively, notches 77 may be provided at both the left and right side edge parts 11. By providing the notch 77, the initial opening becomes easy.

[0063] The easy-opening processing line 51 is cut from one side edge (here, the right side) 11, and reaches the other side edge (here, the left side) 11, so that the upper overlapping plate 34 and the side plate 41 of the outer top part are cut transversely, and at the same time, the upper seal part 53 is cut, and the chuck tape 61 is exposed.

[0064] In addition, when using an intermittent half-cut line or a linear half-cut line for the easy-opening processing line 51 of the opening means, it may be formed by the method using an ordinary cutting tool, but by using a method by laser light irradiation, a method using ultrasonic waves, or a method called diamond cutting, a half-cut line with higher accuracy and stability can be formed.

[0065] Also, the easy-opening processing line 51 may be in a strip shape having a width. Also, a plurality of easy-opening processing lines 51 may be provided. By providing a plurality of them, it is possible to prevent the cutting of the easy-opening processing line 51 from deviating.

[0066] Furthermore, instead of providing the easy-opening processing line 51 as a processing line, a planned opening line may be displayed by printing. In that case, the portion may be opened with a cutting tool such as scissors. Also, the printing position may be printed at the position of the easy-opening processing line 51 shown in FIGS. 1A and 1B.

[0067] <Chuck tape> The chuck tape 61 is formed by extrusion molding of a male chuck tape 61m and a female chuck tape 61f, respectively, and a male chuck tape fitting portion 63m and a female chuck tape fitting portion 63f are fitted.

[0068] <Joining procedure of chuck tape> The procedure for assembling the paper container 90 with a chuck will be described later. Among those procedures, the joining procedure of the chuck tape 61 will be described here.

[0069] The chuck tape joint portion 52 is, in this case, the planned joint portion of the chuck tape 61 when assembling the paper container 90 with a chuck.

[0070] The back blank plate 10a and the front blank plate 10b are overlapped, and the side edge seal margins 36 and the upper seal portions 53 are heat-sealed together. At this time, the chuck tape 61 in which the male chuck tape 61m and the female chuck tape 61f are fitted in advance by the male chuck tape fitting portion 63m and the female chuck tape fitting portion 63f is inserted into this portion. And at the same time, the outer surfaces of the two blank plates 10 are heated and pressed at the chuck tape joint portion 52. Then, the blank plate 10 and the chuck tape 61 are heat-sealed. (See FIGS. 15A and 15B).

[0071] Note that the joining of the chuck tape 61 to the blank plate 10 is not limited to the heat-sealing as described above, and it may be joined by other methods such as an adhesive or an adhesive tape.

[0072] By heat-sealing the chuck tape 61 in such a manner, compared with the method of heat-sealing the male chuck tape 61m and the female chuck tape 61f separately to the chuck tape joint portion 52, the misalignment of the heat-sealing position is reduced, and the attachment process is simplified, so that the chuck tape 61 can be attached with high production efficiency.

[0073] <Laminated Sheet of Blank Plate> As described above, the laminated sheet 78 used for the blank plate 10 is a laminated sheet 78 in which at least a paper base material layer 782 is laminated and at least a thermoplastic resin such as polyethylene is laminated as the innermost thermoplastic resin layer 783. Also, a barrier layer 785 for water vapor, oxygen, and other substances, a strength improvement layer, or the like can be provided in the intermediate layer as needed.

[0074] When a printed layer such as a pattern is provided on the paper container 90 with a chuck of the present embodiment, it is usually printed on the surface of the paper base material layer 782. However, if the printability of the paper base material layer 782 is not good, for example, a printed layer such as a pattern can be provided on a biaxially stretched polyethylene terephthalate film or the like, and the film can be laminated on any layer on the outside of the paper base material layer 782.

[0075] The paper base material layer 782 will be described. The paper base material layer 782 is preferably paper that is rigid and less likely to crack when bent along a folding line or the like, but is not particularly limited, and can be appropriately selected and used according to the content filled in the paper container 90 with a chuck, taking into account water resistance (sizing degree) and the like. As a specific example, high-quality paper, cup base paper, milk carton base paper, etc. can be preferably used, and the basis weight is 80 g / m 2 or more and 320 g / m 2 The following range is appropriate.

[0076] The thermoplastic resin layer (sealant layer) used for the innermost layer, and the outermost layer and intermediate layer as required will be described. As the resin of 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), ethylene-α-olefin copolymer polymerized using a single-site catalyst, ethylene-vinyl acetate copolymer (EVA), ethylene-acrylic acid copolymer (EAA), random copolymer of ethylene-methacrylic acid (EMAA), ethylene-methyl acrylate copolymer (EMA), ethylene-ethyl acrylate copolymer (EEA), ionomer, and polypropylene and its copolymers, polyester-based resins, etc. can be used, and from these, suitable ones can be appropriately selected and used according to the content to be filled and the conditions of storage and use.

[0077] Among the above-mentioned thermoplastic resins, ethylene-methyl acrylate copolymer (EMA) and random copolymer of ethylene-methacrylic acid (EMAA) in particular are excellent in heat stability during processing such as extrusion coating, adhesiveness to various substrates, low-temperature heat sealability, etc., and are also excellent in thin film formability. Therefore, it is easy to extrude coat and laminate the outermost thermoplastic resin layer that does not require much thickness, for example, with a relatively thin thickness of 6 μm or more and 10 μm or less. At the same time, the usage ratio of plastic materials can be reduced, and cost advantages can also be obtained.

[0078] For the innermost layer, and the outermost layer and intermediate layer thermoplastic resin layers (sealant layers) as needed above, after performing adhesion-promoting treatments such as anchor coating, corona treatment, frame (flame) treatment, etc. on the laminated surface as needed, resin can be extruded coated and laminated thereon. In addition, the thermoplastic resin can be pre-made into a film, and the film can be laminated by known dry lamination or extrusion lamination (sandwich lamination), etc.

[0079] When laminating the barrier layer 785 on the intermediate layer of the laminated sheet 78, as the barrier layer 785, in addition to metal foils such as aluminum foil, metal or inorganic oxides such as aluminum, silica, and alumina can be vapor-deposited on base films such as biaxially stretched polyethylene terephthalate film (hereinafter referred to as PET film), biaxially stretched nylon film (ONy film), biaxially stretched polypropylene film (OPP film), etc. with a thickness of 20 nm or more and 100 nm or less, and vapor-deposited films, etc. can be used. Alternatively, saponified ethylene-vinyl acetate copolymer (hereinafter sometimes referred to as EVOH) film, biaxially stretched film of nylon MXD6, polyacrylonitrile film, and PET film, ONy film, OPP film, etc. provided with a coating film layer of polyvinylidene chloride can be used.

[0080] Such a barrier layer 785 is usually preferably laminated on the inner surface of the paper base material layer 782 because its barrier property can be effectively utilized. However, when a metal foil such as aluminum or a metal vapor deposition film is used for the barrier layer 785, it can also be laminated on the outer surface of the paper base material layer 782 in order to utilize its metallic feeling in the design. The barrier layer 785 can be easily laminated by a known dry lamination or extrusion lamination (sandwich lamination).

[0081] The layer structure of the laminated sheet 78 of the blank plate 10 of the paper container 90 with a chuck of the present embodiment is illustrated. Cross-sectional views of the laminated sheet 78 are shown in FIGS. 14A, 14B, 14C, and 14D.

[0082] FIG. 14A is a cross-sectional view of the laminated sheet 78 of the blank plate 10 composed of three layers, and its layer structure is as follows. " / " means the boundary between adjacent layers. (Outer surface) Outermost thermoplastic resin layer 781 / Paper base material layer 782 / Innermost thermoplastic resin layer 783 (inner surface)

[0083] FIG. 14B is a cross-sectional view of the laminated sheet 78 of the blank plate 10 composed of two layers, and its layer structure is as follows. (Outer surface) Paper base material layer 782 / Innermost thermoplastic resin layer 783 (inner surface) It is a layer structure obtained by excluding the outermost thermoplastic resin layer 781 from the blank plate 10 composed of three layers shown in FIG. 14A.

[0084] Further, when the blank plate 10 requires barrier properties (such as water vapor, oxygen, and fragrance retention), a barrier layer 785 can be provided. FIG. 14C is a cross-sectional view of the laminated sheet 78 of the blank plate 10 composed of five layers, and its layer structure is as follows. (Outer surface) Outermost thermoplastic resin layer 781 / Paper base material layer 782 / Intermediate adhesive layer 784 / Barrier layer 785 / Innermost thermoplastic resin layer 783 (inner surface)

[0085] Figure 14D is a cross-sectional view of the laminated sheet 78 of the four-layer blank plate 10, and its layer structure is as follows. (Outer surface side) Paper base material layer 782 / Intermediate adhesive layer 784 / Barrier layer 785 / Innermost thermoplastic resin layer 783 (Inner surface side) This is the layer structure obtained by excluding the outermost thermoplastic resin layer 781 from the five-layer blank plate 10 shown in Figure 14C.

[0086] The joining between the layers of each of the above laminated sheets 78 is performed by known dry lamination, extrusion coating, adhesives, etc. Note that the layers for joining between the layers may not be shown because they are thin.

[0087] <Manufacture of paper container with chuck> An outline of the procedure from the blank plate 10 of the paper container 90 with a chuck to the production of the intermediate-stage paper container with a chuck (flat state) 91, further to the production of the intermediate-stage paper container with a chuck (boxed state) 92, and until the completion of the package of the paper container 90 with a chuck filled with the contents will be described.

[0088] <Manufacture of intermediate-stage paper container with chuck (flat state)> When the above two blank plates 10 are overlapped, a chuck tape 61 in which a male chuck tape 61m and a female chuck tape 61f are pre-fitted is inserted at a position where the chuck tape joints 52 overlap each other, and the chuck tape joints 52 are heated, pressurized, and heat-sealed from the outer surface sides of each of the two blank plates 10.

[0089] Next, the inner surfaces of the upper seal portions 53 are heat-sealed, and the inner surfaces of the seal margins 36 adjacent to the side edge portions 11 of the blank plate 10 are heat-sealed. Then, the intermediate-stage paper container with a chuck (flat state) 91 is formed into a bag shape with the lower edge portion 26 open.

[0090] Further, notches 77 may be provided at each end of the easy-opening processing line 51 (the locations where both sides contact the side edges). Note that the notches 77 may be provided at either one of the ends.

[0091] The paper container 90 with a chuck is not particularly limited in actual production. However, in order to improve productivity, an apparatus that performs the assembly of the paper container, the filling of the contents, and the sealing of each joint in-line may be used.

[0092] In that apparatus, a long printed laminated sheet 78 wound in a roll may be fed out, and in a form where the paper containers are connected horizontally, processing of the folding lines, insertion and heat sealing of the chuck tape 61, heat sealing of the side edge seal allowance 36, heat sealing of the upper seal portion 53, punching of the notches 77, etc. may be performed.

[0093] Note that if the desired paper container 90 with a chuck can be obtained, the order of the above steps may be different.

[0094] Here, the shape of the upper overlapping plate 34 and the shape of the top side plate 41 of the paper container 90 with a chuck of the present embodiment will be described with reference to FIG. 2. Side plates 41 of the top are continuously provided on both the left and right sides of the upper overlapping plate 34. Here, these three forming plates are combined and referred to as the top flap 45. On the top flap 45, an upper seal portion 53, an easy-opening processing line 51, and a chuck tape 61 are provided in sequence from the upper edge 21 side, and a first horizontal folding line 22 is located below the chuck tape 61.

[0095] By the way, in the intermediate-stage paper container with a chuck (flat state) 91, enlarged cross-sectional views of the joint portion of the chuck tape 61, which is the portion where the chuck tape 61 and the blank plate 10 are joined, are shown in FIGS. 15A and 15B. The cutting location is shown at the cross-sectional position A-A in FIG. 2. Here, the blank plate 10 is exemplified by the four-layer laminated sheet 78 in FIG. 14D.

[0096] In FIG. 15A, a female chuck tape 61f is joined to the front blank plate 10b as the front chuck tape 61b. The female chuck tape 61f includes a female chuck tape body portion 62f joined to the blank plate 10 and a female chuck tape fitting portion 63f having a recess for fitting with the male chuck tape 61m. Also, a male chuck tape 61m is joined to the back blank plate 10a as the back chuck tape 61a. The male chuck tape 61m includes a male chuck tape body portion 62m joined to the blank plate 10 and a male chuck tape fitting portion 63m having a protrusion for fitting with the female chuck tape 61f.

[0097] In FIG. 15B, a male chuck tape 61m is joined to the front blank plate 10b as the front chuck tape 61b. The male chuck tape 61m includes a male chuck tape body portion 62m joined to the blank plate 10 and a male chuck tape fitting portion 63m having a protrusion for fitting with the female chuck tape 61f. Also, a female chuck tape 61f is joined to the back blank plate 10a as the back chuck tape 61a. The female chuck tape 61f includes a female chuck tape body portion 62f joined to the blank plate 10 and a female chuck tape fitting portion 63f having a recess for fitting with the male chuck tape 61m.

[0098] Whether the male chuck tape 61m or the female chuck tape 61f is joined to the front blank plate 10b is appropriately selected according to the required performance of the paper container 90 with chuck and the specifications of the manufacturing apparatus for the paper container 90 with chuck.

[0099] <Manufacture of Intermediate-Stage Paper Container with Chuck (In the State of Being Bent Up)> A mandrel is inserted through the opening at the bottom 73 of the chucked paper container (flat state) 91 at this intermediate stage, leaving the upper overlapping plate 34. The top plate 33 below it is spread front and back by the first horizontal folding line 22, and the top flap 45 composed of the upper overlapping plate 34 and the side plates 41 at the top is erected upward.

[0100] Here, in order to ensure the bending process of the ridge part 72d of the body part 72, an auxiliary member may be brought into contact with the inner and / or outer side of the body part 72 near (including contact with) the ridge part 72d.

[0101] An intermediate-stage chucked paper container (in the erected state) 92 is formed, which includes the top part 71 including the top plate 33 under the upper overlapping plate 34, followed by the body part 72, and the bottom 73 has an opening in a substantially rectangular shape. At this stage, as shown in Figure 3, the upper overlapping plate 34 stands upright upward.

[0102] In the design, the shape of the horizontal cross-section of the body part 72 and the shape of the opening of the bottom 73 are assumed to be rectangular. However, since it is a chucked paper container 90 made of a laminated sheet 78 mainly composed of paper and having flexibility, it is considered to be substantially rectangular, including cases where it does not become a perfect rectangle.

[0103] <Forming and Filling of Chuck Paper Container> Next, the upper overlapping plate 34 that stands upright upward is folded and laid down on the back side (the side of the back top plate 33a), and the protruding parts 74 of the top part on both the left and right sides are folded in the direction of the side plate 32 and joined to the body part 72. At this time, the folding part 76 of the protruding part 74 of the top part is folded. In order to ensure the folding process of the folding part 76, an auxiliary member may be brought into contact with the inner and / or outer side of the top part 71 near (including contact with) the folding part 76.

[0104] The method of joining the top portion 74 of the side part to the body part 72 may be a method using an adhesive (such as hot melt), a method using an adhesive tape, a method of mechanically joining (engaging, using a joining tool), etc. Also, when a thermoplastic resin layer (sealant layer) is provided on the outermost layer of the blank plate 10, there is a method of heat-sealing the thermoplastic resin layer (sealant layer). The same method is used for joining the bottom portion protrusion described later.

[0105] <Formation of the Bottom of the Paper Container with a Chuck> The bottom 73 of the intermediate-stage paper container with a chuck (in the erected state) 92 formed as described above is turned upward, and the contents are filled from the opened bottom 73. Next, the third horizontal folding line 24 of the lower part of the wall plates 31 on both the front and back sides is folded in a mountain fold as seen from the outside. In the description of the folding method of the folding lines hereafter, the description "as seen from the outside" may be omitted.

[0106] At the same time, the third horizontal folding line 24 of the lower part of the side plates 32 on both the front and back and left and right sides is folded in a valley fold. Since the inner surfaces of the side edge margins 36 on both the front and back sides have already been joined together, and it is tilted toward the back (the side of the back side plate 32a), the third horizontal folding line 24 of the lower part of the side plates 32 on both the front and back and left and right sides can be easily folded. By doing so, the bottom plates 35 on both the front and back sides are folded substantially perpendicular to the wall plates 31 and become substantially in a single planar shape, so a stable bottom portion 731 is formed.

[0107] And the bottom side protrusion substitutes 43 provided on both the left and right sides of the bottom plate 35 have the bottom side diagonal folding line 18 existing inside thereof mountain-folded, with the inner surfaces facing each other but not joined, and protruding in the left and right outer side directions at the lower part of the body portion 72. Then, when the fourth horizontal folding line 25 on both the front and back sides is valley-folded, the bottom side seal substitute 37 stands up and becomes a planar shape extending in the left-right direction. And when the inner surface of the front side bottom side seal substitute 37b and the inner surface of the back side bottom side seal substitute 37a are overlapped and heated and pressed by a heated heater bar from the outer side of the bottom side seal substitute 37 on both the front and back sides, the two are joined and the paper container 90 with a chuck filled with the contents is sealed. Here, heat sealing by a heater bar is exemplified, but other known sealing methods such as ultrasonic sealing and high-frequency sealing may also be used.

[0108] The joined bottom side seal substitute 37 is laid down on the back side so as to approach the back side top plate 33a. Here, the region adjacent to the bottom side protrusion substitute 43 of the bottom side seal substitute 37, the bottom side diagonal bottom side protrusion substitute 43 bent at the bottom side diagonal folding line 18, and the region adjacent to the bottom side protrusion substitute 43 of the side edge side seal substitute 36 are overlapped, and they form the bottom side protrusion 75. The bottom side protrusion 75 is planar although a plurality of laminated sheets 78 are stacked, and it is possible to bend at the bent portion 79 of the bottom side protrusion 75. (Refer to FIGS. 8 and 9).

[0109] The bottom side protrusion 75 is bent inward at the bent portion 79 of the bottom side protrusion 75 so that the bottom surface portion 73 is close to the bottom surface portion 73. Further, the bottom side protrusion 75 and the bottom surface portion 73 are joined to form the bottom 73. And the package of the paper container 90 with a chuck filled with the contents is completed. As an example of the joining method between the bottom side protrusion 75 and the bottom surface portion 73, various adhesives such as hot melt, emulsion-based adhesives, and rubber-based adhesives may be used. Also, the thermoplastic resin layers provided on the outermost layer of the laminated sheet 78 of the blank plate 10 may be heat-sealed.

[0110] Here, the location where the bottom gusset protrusion 75 and the bottom surface portion 731 are joined will be described in detail. The bottom gusset seal margins 37 that are bent by the fourth horizontal folding line 25 are joined together. More specifically, the front bottom gusset seal margins 37b are joined together. The joined front and back bottom gusset seal margins 37 have strength (rigidity) because the two laminated sheets 78 are joined. Therefore, the joining of the bottom surface portion 731 and the bottom gusset protrusion 75 is strong, and since the bottom 73 has excellent shape retention, it is difficult to deform.

[0111] When the chucked paper container 90 is placed on a table (a workbench, a shelf, or other representative objects on which the chucked paper container 90 is placed), to enhance the self-standing stability of the chucked paper container 90, it is desirable that the outer peripheral portion of the bottom 73 mainly contacts the table and does not contact at the inner part closer to the center than the outer peripheral portion of the bottom 73. Here, the outer peripheral portion includes the third horizontal folding line 24 at the peripheral portion of the bottom surface portion 731 and the vicinity of the bent portion 79 of the bottom gusset protrusion 75.

[0112] When the inside of the bottom 73 touches the table and the chucked paper container 90 is in a tilted state, that is, when there are many places where the outer peripheral portion is floating, the placement state of the chucked paper container 90 becomes unstable and the risk of tipping over increases.

[0113] Therefore, it is desirable that the inside of the bottom 73 is recessed when viewed from below the outer peripheral portion. In other words, when viewed through from the front, it is desirable that the inside of the bottom 73 is located above the outer peripheral portion. Similarly, when viewed through from the side of the chucked paper container 90, it is desirable that the inside of the bottom 73 is located above the outer peripheral portion. Since the shape is the same as when viewed through from the front, the description will be given for the case of viewing through from the front.

[0114] The shape in which the inside of the bottom 73 is located above the outer peripheral portion is processed in the process of forming the bottom 73. Figure 8 shows a state where the container is filled with contents, and then the bottom gusset 37 is heat-sealed, and it is laid on its back (the back side of the bottom panel 35a side). The bottom gusset projections 75 on both the left and right sides are connected to the bottom surface portion 731 via the bent portions 79 of the bottom gusset projections 75. In this state, the bottom gusset projections 75 on both the left and right sides and the bottom surface portion 731 are substantially planar. Although there are occurrences such as the number of laminated sheets 78 being overlapped, the step at the end face, and the unevenness of the ruled line portion, since the bending of the bent portion 79 of the bottom gusset projection 75 is possible, it is made substantially planar.

[0115] The bent portion 79 is valley-folded, and the bottom gusset projection 75 approaches the bottom surface portion 731. Before this processing, first, the inside of the bottom surface portion 731, particularly near the central portion, is pushed upward in the upward direction. Depending on the processing method, the bottom 73 may be processed in an upward state, and in that case, it becomes a pushing-down operation, but in this specification, it will be described in the direction based on the paper container 90 with a chuck.

[0116] By pushing up the bottom surface portion 731 in the upward direction, the bottom surface portion 731 is deformed into a concave shape when viewed from the downward side. After this processing, it becomes concave shape processing. However, before the concave shape processing is performed, there may be a case where the bottom surface portion 731 already has the desired shape (concave shape), and in that case, the concave shape processing may not be performed.

[0117] Alternatively, when processing to bring the bottom gusset projection 75 closer to the bottom surface portion 731, the bottom surface portion 731 may be deformed into a concave shape along with this processing, and in that case, the concave shape processing may not be performed either.

[0118] And before the bottom-side protruding portion 75 is joined, after the bottom-side protruding portion 75 is bent so as to be convex when viewed from below, it is joined to the bottom surface portion 731 with hot melt. FIG. 10 is an enlarged cross-sectional view of the vicinity of the bent portion 79 of the bottom portion 73 at the cross-sectional position B-B shown in FIG. 6. FIG. 11A is a cross-sectional view of the bottom portion 73 at the cross-sectional position B-B shown in FIG. 6. The joining of the bottom surface portion 731 and the bottom-side protruding portion 75 is carried out at the joining portion 732 of the bottom. Note that the bending of the bottom-side protruding portion 75 may already have a desired shape (convex shape), and in that case, the bending may not be necessary.

[0119] The bottom-side protruding portion 75 is deeply bent and joined at the bent portion 79 to the bottom surface portion 731 that is sufficiently deeply concave. Therefore, the angle formed by the bottom-side protruding portion 75 and the side plate 32 becomes smaller than a right angle. Further, the bottom-side protruding portion 75 has a shape that goes upward as it goes inward, and does not protrude downward from the outer peripheral portion of the bottom 73 side. And since the bottom portion 73 has a shape in which the outer peripheral portion is located lower than the inside, the chuck-equipped paper container 90 is stable when placed on the table.

[0120] Also, since the hard bottom-side seal margin 37 is joined with the convex shapes facing in the reverse direction (back to back), the shape is easily fixed. Here, each has a convex shape on the outer side, and there is a portion with the widest interval in the intermediate region between the position of the bent portion 79 of the bottom-side protruding portion 75 and the joining portion 732 near the tip of the bottom-side protruding portion 75. With such a shape, when joined, the shape of the bottom-side protruding portion 75 is easily maintained.

[0121] FIG. 4 is a perspective view showing the chuck-equipped paper container 90 of the present embodiment. FIG. 5 is a side view of the chuck-equipped paper container 90 shown in FIG. 4. FIG. 6 is a plan view of the chuck-equipped paper container 90 shown in FIG. 4. FIG. 7 is a front view of the chuck-equipped paper container 90 shown in FIG. 4. FIG. 9 is a bottom view of the chuck-equipped paper container 90 shown in FIG. 4.

[0122] The paper container 90 with a chuck shown in Fig. 4 has an outer shape formed in a substantially rectangular parallelepiped shape and includes a ridge portion 72d of the body portion 72. Since the paper container 90 with a chuck is made of a laminated sheet 78 mainly composed of paper and having flexibility, it does not have a perfect rectangular parallelepiped shape, so it is in a substantially rectangular parallelepiped shape.

[0123] <Opening operation for taking out the paper container with a chuck> The procedure until the top portion 71 of the package of the completed paper container 90 with a chuck containing the contents is opened to take out the contents will be described. First, the top portion protruding portion 74 joined to the body portion 72 is peeled off. Then, by lifting the top portion protruding portion 74 upward, the side plate 41 on the top portion side rises, and accordingly, the upper overlapping plate 34 also rises. And the side plate 41 on the top portion side and the upper overlapping plate 34 form substantially the same plane. The upper overlapping plate 34 and the side plate 41 on the top portion side that form substantially the same plane are combined and called the top flap 45 as described before.

[0124] Then, the easy-open processing line 51 is started to be opened by the user's finger from the notch 77 provided at one (here, the right side) side edge portion 11 and is cut until it reaches the other (here, the left side) side edge portion 11. And the upper seal portion 53 is cut off. At this stage, the chuck tape 61 has not been dissociated yet and has the shape shown in Fig. 12, and this shape is called the paper container 93 with a chuck from which the upper seal portion has been cut off. Also, the top flap 45 is cut by the easy-open processing line 51, and after cutting off the portion left at the side of the first horizontal folding line 22, it is called the top flap 46.

[0125] Next, the front opening gripping margin 57b between the front easy-open processing line 51b and the front chuck tape 61b and the back opening gripping margin 57a between the back easy-open processing line 51a and the back chuck tape 61a are each gripped with the user's finger and expanded in the outward direction of the paper container 90 with a chuck, whereby the chuck tape 61 exposed at the easy-open processing line 51 is opened. Fig. 13 shows the paper container 90 with a chuck in which the top portion 71 is opened.

[0126] When the chuck tape 61 opens, the ends near the side edges 11 of each blank plate 10 of the chuck tape 61 open over substantially the entire width up to the side edge seal margin 36. However, the side edge seal margin 36 is not peeled off. In this way, the male chuck tape 61m and the female chuck tape 61f of the chuck tape 61 dissociate, forming the extraction opening 56.

[0127] <Second Embodiment of the Present Disclosure> In this embodiment, although the shape of the bottom gusset projection 75 of the paper container 90 with a chuck is different, other shapes, materials, etc. are the same as those in the first embodiment.

[0128] FIG. 11B is a cross-sectional view of the bottom 73 at the cross-sectional position B-B shown in FIG. 6. The bottom gusset projection 75 is concave when viewed from below at the time of joining with the bottom surface portion 731. The position of the bottom joint portion 732 is the same as that in the first embodiment. In such a form, the position of the underside of the bottom gusset projection 75 is farther from the table.

[0129] <First Aspect of the Third Embodiment of the Present Disclosure> In this aspect, the blank plates 10 shown in FIGS. 16A and 16B are prepared. On the outer blank plate 10b, a tip bending line 19b of the outer bottom gusset projection is provided on the underside.

[0130] The tip bending line 19b of the outer bottom gusset projection extends vertically from a point above the outer bottom diagonal bending line 18b downward to the outer lower edge 26b, and also includes the tip bending line 191b of the outer first bottom gusset projection. Further, from the same point as above, it also includes the tip bending line 192b of the outer second bottom gusset projection that extends horizontally outward to the outer side edge 11b near the outer side. Note that similarly, on the back blank plate 10a as well, there is a tip bending line 19a of the back bottom protruding portion, and its shape is the same as that of the tip bending line 19b of the front bottom protruding portion.

[0131] Fig. 17 shows a paper container with a chuck at an intermediate stage (in a planar state), and there is a tip bending line 19b of the front bottom protruding portion on the bottom side. Further processing is carried out, and a bottom view of the formed paper container 90 with a chuck is shown in Fig. 18. There is a tip bending portion 751 at the tip of the bottom protruding portion 75.

[0132] Before the bottom protruding portion 75 is joined, the bottom protruding portion 75 is bent in the same manner as in the first embodiment so as to be convex when viewed from the bottom side, and then it is joined to the bottom surface portion 731 with hot melt. Fig. 11C is a cross-sectional view of the bottom 73 at the cross-sectional position B-B shown in Fig. 6. The bottom surface portion 731 and the bottom protruding portion 75 are joined at the bottom joint portion 732.

[0133] Note that the tip bending portion 751 of the bottom protruding portion 75 is valley-folded when viewed from the bottom side. Also, the bottom joint portion 732 is located at the tip side rather than the tip bending portion 751. Alternatively, although not shown, it may extend to the region of the base end side of the bottom protruding portion 75 across the tip bending portion 751.

[0134] When the bottom protruding portion 75 is joined to the bottom surface portion 731 at the bottom joint portion 732, by providing the bending portion 751 of the bottom protruding portion 75, the following effects occur. If the bottom protruding portion 75 and the bottom surface portion 731 have a shape that is difficult to adhere closely at the bottom joint portion 732, there is a risk that their joining will be incomplete. In that case, by appropriately bending the tip bending portion 751 of the bottom protruding portion 75, the bottom protruding portion 75 and the bottom surface portion 731 are deformed so as to be along each other, making it easier to adhere, and thus their joining becomes stable. Note that the tip bending portion 751 of the bottom protruding portion 75 may be appropriately valley-folded or mountain-folded depending on the state. Alternatively, it may not be folded at all.

[0135] <Second Aspect of the Third Embodiment of the Present Disclosure> In this aspect, except that the shape of the bottom gusset 75 is different due to bending, the shape of the blank plate 10 and the method of manufacturing the paper container 90 with a chuck are the same as those in the first aspect of this embodiment.

[0136] Before the bottom gusset 75 is joined, the bottom gusset 75 is bent in the same manner as in the second embodiment so as to be concave when viewed from below, and then joined to the bottom surface portion 731 with hot melt. FIG. 11D is a cross-sectional view of the bottom 73 at the cross-sectional position B-B shown in FIG. 6. The bottom surface portion 731 and the bottom gusset 75 are joined at the bottom joint portion 732. Note that the tip bent portion 751 of the bottom gusset 75 is valley-folded when viewed from below, and the bottom joint portion 732 is located at the tip side rather than the tip bent portion 751.

[0137] <Fourth Embodiment of the Present Disclosure> In the paper container 90 with a chuck of each embodiment described so far, the chuck tape 61 is provided on the top portion 71. However, in the present disclosure, a paper container without the chuck tape 61 is also possible. A paper container 97 without a chuck, which is a paper container without a chuck tape, is shown in FIG. 20. The paper container of this embodiment is based on the paper container 90 with a chuck of the first embodiment shown in FIG. 4, and then the chuck tape 61 is omitted.

[0138] In this embodiment, although the presence or absence of the chuck tape 61 is different, the shape, material, etc. of the blank plate 10 are the same as those in the first embodiment. The manufacturing method is the same as that in the first embodiment except for the step of joining the chuck tape. Further, the shape of the bottom 73 of the formed paper container 90 with a chuck is the same as that in the first embodiment.

[0139] The shape of the bottom 73 of the paper container 90 with a chuck of this embodiment can be applied to the shapes of the second embodiment, the third embodiment, etc.

[0140] According to the above-described embodiment, when the bottom protrusion 75 of the paper container 90 with a chuck is joined to the bottom surface portion 731, the bottom protrusion 75 and the bottom surface portion 731 are joined in an appropriate shape, so that a paper container 97 without a chuck that is stable when placed on a table or the like can be provided.

Example

[0141] Hereinafter, the embodiments of the present disclosure will be described more specifically with reference to examples.

[0142] <Example 1> In Example 1, a paper container 90 with a chuck shown in FIG. 4 was produced using the blank plates 10 of FIGS. 1A and 1B corresponding to the present embodiment.

[0143] Two blank plates 10 of FIGS. 1A and 1B were prepared, and their inner surfaces were aligned and overlapped. As shown in FIG. 2, the side edge margins 36 of both opposite sides were heat-sealed, and the upper seal portion 53 was also heat-sealed. At the same time, the chuck tape 61 was also heat-sealed. In this way, a paper container with a chuck (flat state) 91 in an intermediate stage where the bottom margin 37 was unsealed was produced.

[0144] The laminated sheet 78 of the blank plate 10 had the following configuration. Although a cross-sectional view of the laminated sheet 78 is shown in FIG. 14D, the pattern printing layer and the like are not shown. (Outer surface side) Pattern printing layer (gravure printing on the outer surface of the paper base material layer 782) / Paper base material layer 782 (base paper for liquid paper container 150 g / m 2 Nippon Paper Industries) / Intermediate adhesive layer 784 (EMAA 20 μm Mitsui Dow Chemical N0908N) / Barrier layer 785 (silica-deposited PET 12 μm Dainippon Printing IB-PET-UBP) / Innermost thermoplastic resin layer 783 (LDPE 40 μm Nippon Polyethylene LC520) (Inner surface side)

[0145] The manufacturing method of the above laminated sheet 78 will be described. First, the roll-shaped paper base material layer 782 was fed out, and a predetermined pattern or character was gravure-printed at a predetermined position and then wound up again in a roll shape.

[0146] In the next step, the above roll-shaped paper base material layer 782 was fed out, and the barrier layer 785 (silica-deposited PET 12 μm) was laminated on the inner surface of the paper base material layer 782 by extrusion lamination (sandwich lamination) with the molten intermediate adhesive layer 784 (EMAA 20 μm) interposed therebetween.

[0147] Next, the innermost thermoplastic resin layer 783 (LDPE 40 μm) was formed on the opposite side (inner surface side) of the paper base material layer 782 of the barrier layer 785 by extrusion lamination and then wound up again in a roll shape.

[0148] Also, an anchor coat treatment, a corona treatment, a flame treatment (flame treatment), etc. may be performed between each bonding layer as necessary to improve the bonding strength. Alternatively, an ozone treatment or the like may be performed on the molten resin.

[0149] Next, the roll-shaped laminated sheet 78 was fed out, and ruled line processing, punching processing, etc. were performed to complete the blank plate 10.

[0150] The chuck tape 61 that is heat-sealed and attached to the inner surfaces of the upper overlapping plate 34 and the side plate 41 at the top of the paper container 90 with a chuck has a two-layer structure of the chuck tape body portion 62 that is heat-sealed for both the male chuck tape 61m and the female chuck tape 61f. The resin layer on the surface of the chuck tape 61 that is heat-sealed to the paper container 90 with a chuck is formed of LLDPE, the resin layer on the opposite surface is formed of MDPE, and the fitting portions of the male chuck tape fitting portion 63m and the female chuck tape fitting portion 63f are both formed of LLDPE, and the width of the chuck tape body portion 62 is 7 mm in both cases.

[0151] The dimensions of the back blank plate 10a and the front blank plate 10b are rectangular with a length of 250 mm and a width of 189 mm. As a sealing margin for the peripheral edge portions, side edge margin seals 36 with a width of 7 mm are provided on the side edge portions 11 on both sides. Also, bottom edge margin seals 37 with a width of 10 mm are provided on the lower edge portions 26 at the bottom on both sides. Also, a sealing margin for the upper seal portion 53 with a width of 3 mm is provided on the upper edge portions 21 of the upper overlapping plate 34 and the side plates 41 at the top.

[0152] On the blank plate 10, an upper overlapping plate 34, a first horizontal folding line 22, a top plate 33, a second horizontal folding line 23, a wall plate 31, a third horizontal folding line 24, and a bottom plate 35 are provided in this order from the upper edge portion 21 in the downward direction.

[0153] Also, side plates 41 at the top are provided outside both sides of the upper overlapping plate 34 via second vertical folding lines 13. Further, top edge projecting margins 38 are provided outside both sides of the top plate 33 via second vertical folding lines 13. Also, side plates 32 are provided outside both sides of the wall plate 31 via second vertical folding lines 13. Further, bottom edge projecting margins 43 are provided outside both sides of the bottom plate 35 via second vertical folding lines 13.

[0154] And on the upper overlapping plate 34 and the side plates 41 at the top, when the positions of the inner surfaces of the two blank plates 10 are aligned and overlapped, an easy-open processing line 51 as an opening means for the container is provided at a position 6 mm below the upper edge portion 21 which becomes the upper edge, as shown in FIG. 2, in the transverse direction of the paper container 90 with a chuck, together with the printing of the paper base material layer 782 of the laminated sheet 78. The easy-open processing line 51 is provided as an intermittent half-cut line.

[0155] Also, below the easy-open processing line 51, the chuck tape 61 was heat-sealed in a direction crossing the paper container 90 with a chuck on the inner surfaces of the upper overlapping plate 34 and the side plate 41 at the top. Here, the distance between the easy-open processing line 51 and the chuck tape 61 was 5 mm.

[0156] Also, by the method described above, after joining the two blank plates 10, heat-sealing the chuck tape 61, heat-sealing the side edge seal margin 36, and heat-sealing the upper seal portion 53, a notch 77 was provided at the side edge 11 on the right side of the overlapping easy-open processing lines 51, and a paper container 91 with a chuck in an intermediate stage with the bottom seal margin 37 in an unsealed state (flat state) was produced.

[0157] Next, a mandrel was inserted into the opening of the unsealed bottom seal margin 37 of the paper container 91 with a chuck in this intermediate stage (flat state), leaving the upper overlapping plate 34, and the top plate 33 below it was spread forward and backward by the first horizontal folding line 22, and the upper overlapping plate 34 was erected upward. Below the upper overlapping plate 34, the top portion 71 by the top plate 33 and then a body portion 72 with a substantially rectangular horizontal cross-section (a plane substantially parallel to the bottom surface) continued, and a paper container 92 with a chuck in an intermediate stage (in a boxed state) with the bottom 73 opening in a substantially rectangular shape was formed. (See FIG. 3).

[0158] Then, the overlapped upper overlapping plate 34 was folded along the back surface of the top plate 33a. After that, the top edge projections 74 continuously provided on both the left and right sides of the top portion 71 were joined to the body portion 72. Hot melt was used for the joining.

[0159] When the top edge projection 74 was joined to the body portion 72, the angle formed by the top portion 71 and the top edge projection 74 through the bent portion 76 of the top edge projection 74 was bent to be substantially right-angled. However, the bent portion 76 after the top edge projection 74 was joined to the body portion 72 could sometimes be an obtuse angle close to a right angle.

[0160] The bottom 73 of the intermediate-stage paper container with a chuck (in the erected state) 92 formed as described above was turned upward, and the snack was filled from the opened bottom 73. Next, the third horizontal folding line 24 at the lower part of the wall panels 31 on both the front and back sides was mountain-folded.

[0161] At the same time, the third horizontal folding line 24 at the lower part of the side panels 32 on both the front and back and left and right sides was valley-folded. And the bottom-side protrusion substitutes 43 provided on both the left and right sides of the bottom panel 35 had the bottom-side diagonal folding line 18 existing inside thereof mountain-folded, and protruded in the left and right outer directions at the lower part of the body 72. And the bottom panels 35 on both the front and back sides were folded so as to be substantially perpendicular to the wall panels 31 and became substantially a single planar shape.

[0162] And when the fourth horizontal folding line 25 on both the front and back sides was valley-folded, the bottom-side seal substitute 37 stood up and became a planar shape extending in the left and right direction. And the inner surface of the front-side bottom-side seal substitute 37b and the inner surface of the back-side bottom-side seal substitute 37a were overlapped, and were heated and pressed by a heated heater bar from the outside of the bottom-side seal substitute 37 on both the front and back sides. And the two were joined, and the paper container 90 with a chuck filled with the contents was sealed.

[0163] Next, the joined bottom-side seal substitute 37 was tilted backward so as to approach the back-side top panel 33a.

[0164] And the inside of the bottom surface part 731, particularly near the central part, was pushed up in the upward direction by a pushing member, and the bottom surface part 731 was deformed into a concave shape when viewed from the downward side.

[0165] Next, when the bottom-side protrusion 75 was joined to the bottom surface part 731, the bottom-side protrusion 75 was bent so as to be convex when viewed from the downward side, and then was joined to the bottom surface part 731 with hot melt. And the dimensions of the completed substantially rectangular parallelepiped-shaped paper container 90 with a chuck were formed such that the width was 95 mm, the height was 120 mm, and the depth was 80 mm. In this way, the package of the paper container 90 with a chuck filled with the snack of this embodiment was produced.

[0166] <Example 2> In this example, it was the same as Example 1 except that the shape of the bottom bulge 75 was different. The shape of the bottom in this example was the shape described in the second embodiment.

[0167] In this example, when looking at the bottom bulge 75 from below, it was in a concave shape, which was easy to align with the concave shape of the bottom surface portion 731. Therefore, the joint portion 732 at the bottom was in a shape that was easy to join. Furthermore, the depression inside the bottom bulge 75 was in a shape that was easy to keep a distance from the table.

[0168] <Example 3> In this example, it was the same as Example 1 except that the shape of the bottom bulge 75 was different. The shape of the bottom 73 in this example was the shape described in the first aspect of the third embodiment.

[0169] In this example, because the tip bending portion 751 of the bottom bulge 75 existed, when the tip bending portion 751 bent, the bottom bulge 75 and the bottom surface portion 731 were aligned, and their joint was stabilized.

[0170] <Example 4> In this example, it was the same as Example 1 except that the shape of the bottom bulge 75 was different. The shape of the bottom 73 in this example was the shape described in the second aspect of the third embodiment.

[0171] In this example, because the tip bending portion 751 of the bottom bulge 75 existed, when the tip bending portion 751 bent, the bottom bulge 75 and the bottom surface portion 731 were aligned, and their joint was stabilized. <Example 5> In this example, it was the same as Example 1 except that the chuck tape 61 was omitted. The shape of the bottom 73 was the same as that in Example 1.

[0172] <Comparative Example> In the paper container 80 with a chuck of the comparative example, the bottom surface portion 876 was not processed into a concave shape, and furthermore, the bottom ridge protrusion 875 joined to the bottom surface portion 876 protruded downward from the bottom portion 873.

[0173] FIG. 19 is a cross-sectional view of the bottom portion 873 at the cross-sectional position B-B shown in FIG. 6. Note that although FIG. 6 is a drawing of the paper container 90 with a chuck of the present disclosure, it is diverted to the comparative example for the purpose of explanation. The bottom surface portion 876 is substantially flat, and the bottom ridge protrusion 875 and the bottom surface portion 876 are joined at the bottom joint portion 877. The bottom ridge protrusion 875 was inclined downward so as to face downward as it went toward the inner side. In the bottom portion 873, the inner part was positioned lower than the peripheral portion. Here, the reference numerals used when explaining the comparative example are in the 80s or 800s in order to distinguish them from the present disclosure.

[0174] <Evaluation> 200 samples each of Examples 1 to 5 and the samples of the comparative example were produced. The contents were filled with snack foods.

[0175] The packages of the paper containers with chucks of Examples 1 to 5 and the comparative example that were completed were placed on the table. The paper containers 90 with chucks of Examples 1 to 5 were stably placed on the table. The paper container 80 with a chuck of the comparative example strongly hit the table with the bottom ridge protrusion 875, that is, the inside of the bottom portion 873 was in contact with the table, and the paper container 80 with a chuck was placed in an inclined manner and lacked stability.

[0176] In the samples of Examples 1 to 5, the user could easily cut off the upper seal portion 53 of the easy-opening processing line 51 by the notch 77 provided as the initial opening means on the side plate 41 of the top portion, the upper overlapping plate 34, and the easy-opening processing line 51 provided on the side plate 41 of the top portion. Next, the user grasped the outer opening margin 57b between the outer easy-opening processing line 51b and the outer chuck tape 61b, and the inner opening margin 57a between the inner easy-opening processing line 51a and the inner chuck tape 61a with their fingers, and expanded it in the outward direction of the paper container with a chuck. Then, the chuck tape 61 could be detached, and thus an extraction opening 56 of sufficient size was secured.

[0177] Regarding the packages of the paper containers 90 with chucks of Examples 1 to 5 in which the chuck tape 61 was detached as described above, the suitability for extracting the contents and the resealability by the chuck tape 61 were tested.

[0178] The fitting of the chuck tape 61 was easily detached, the upper part of the paper container 90 with a chuck was opened over substantially the entire width, and an extraction opening 56 was formed. Through the extraction opening 56, the snack foods filled inside could be easily taken out.

[0179] Also, after a part of the contents was taken out, the packages of the paper containers 90 with chucks of Examples 1 to 5 were easily refitted with the chuck tape 61 and resealed. Then, the remaining contents were properly stored.

[0180] Furthermore, for the paper container 90 with a chuck of the present disclosure, the mass ratio of the paper to the total mass of the paper container 90 with a chuck sufficiently satisfied 51% by mass or more, which is the standard for a paper container.

Explanation of Reference Numerals

[0181] 10 Blank board 10a Inner blank board 10b Outer blank board 11 Side edge 12 First longitudinal folding line 13 Second longitudinal folding line 14 Second longitudinal folding virtual line 15 Top-side protruding part folding line 17 Top-side diagonal folding line 18 Bottom-side diagonal folding line 19 Tip bending line of the bottom bulge 191 Tip bending line of the first bottom bulge 192 Tip bending line of the second bottom bulge 21 Upper edge 22 First horizontal bending line 23 Second horizontal bending line 24 Third horizontal bending line 25 Fourth horizontal bending line 26 Lower edge 31 Wall panel 32 Side panel 33 Ceiling panel 34 Upper overlapping plate 35 Bottom plate 36 Side edge seal allowance 37 Bottom edge seal allowance 38 Ceiling bulge allowance 41 Side plate of the ceiling part 43 Bottom bulge allowance 51 Easy-opening processing line 52 Chuck tape joint 53 Upper seal part 56 Take-out opening 57 Opening grip allowance 61 Chuck tape 63 Chuck tape fitting part 71 Ceiling part of the paper container with a chuck 72 Body part of the paper container with a chuck 72d Ridge part of the body 73 Bottom part of the paper container with a chuck 731 Bottom surface part 732 Bottom joint part 74 Ceiling bulge 75 Bottom bulge 751 Tip bending part of the bottom bulge 76 Bending part of the ceiling bulge 77 Notch 78 Laminated sheet 781 Outermost thermoplastic resin layer 782 Paper base material layer 783 Innermost thermoplastic resin layer The adhesive layer in the middle of 784 785 Barrier layer 79 The bent part of the bottom protrusion 80 The paper container with a chuck of the comparative example 873 The bottom of the paper container with a chuck 875 Bottom protrusion 876 Bottom surface part 877 The joint part of the bottom 90 The paper container with a chuck of the present disclosure 91 The paper container with a chuck at the intermediate stage of the present disclosure (flat state) 92 The paper container with a chuck at the intermediate stage of the present disclosure (boxed state) 93 The paper container with a chuck in which the upper seal part of the present disclosure is cut off 94 The paper container with a chuck in which the top part of the present disclosure is opened 97 The paper container without a chuck of the present disclosure A The cutting position of the enlarged cross-sectional view of the chuck tape joint B The cross-sectional position of the paper container with a chuck E The first top intersection point (the intersection point of the first longitudinal folding line and the first transverse folding line) F The second top intersection point (the intersection point of the second longitudinal folding line and the second transverse folding line) G The first bottom intersection point (the intersection point of the first longitudinal folding line and the fourth transverse folding line) H The second bottom intersection point (the intersection point of the second longitudinal folding line and the third transverse folding line)

Claims

1. In a paper container with a chuck, in which a blank plate made of a laminated sheet including a paper base material layer is assembled, the blank plate includes at least a front blank plate and a back blank plate, at the upper part of the paper container with a chuck, a top part composed of an upper overlapping plate where the front blank plate and the back blank plate are overlapped and joined, and a top plate continuously provided below the upper overlapping plate, side plates of the top part continuously provided on both left and right sides of the upper overlapping plate, top part edge protrusions continuously provided on both left and right sides of the top part, a body part provided below the top part, a bottom part provided below the body part, an upper seal part crossing the upper edge part or the vicinity of the upper edge part of the upper overlapping plate and the side plates of the top part, an easy-open processing line located below the upper seal part and crossing the upper overlapping plate and the side plates of the top part, and a chuck tape located below the easy-open processing line and crossing the upper overlapping plate and the side plates of the top part, the bottom part includes a bottom surface part and a bottom edge protrusion, the bottom surface part has a concave shape when viewed from the side, the bottom edge protrusion has a concave shape when viewed from the side in the width direction of the paper container with a chuck, and is joined to the bottom surface part.

2. In a paper container with a chuck, in which a blank plate made of a laminated sheet including a paper base material layer is assembled, the blank plate includes at least a front blank plate and a back blank plate, at the upper part of the paper container with a chuck, a top part composed of an upper overlapping plate where the front blank plate and the back blank plate are overlapped and joined, and a top plate continuously provided below the upper overlapping plate, side plates of the top part continuously provided on both left and right sides of the upper overlapping plate, top part edge protrusions continuously provided on both left and right sides of the top part, a body part provided below the top part, a bottom part provided below the body part, an upper seal part crossing the upper edge part or the vicinity of the upper edge part of the upper overlapping plate and the side plates of the top part, an easy-open processing line located below the upper seal part and crossing the upper overlapping plate and the side plates of the top part, and a chuck tape located below the easy-open processing line and crossing the upper overlapping plate and the side plates of the top part, the bottom part includes a bottom surface part and a bottom edge protrusion, the bottom surface part has a concave shape when viewed from the side, The bottom gusset protrusion is convex when viewed from below in the width direction of the paper container with a chuck, and is a paper container with a chuck joined to the bottom surface portion.

3. The paper container with a chuck according to claim 1 or 2, wherein the bottom gusset seal margin of the bottom gusset protrusion and the bottom gusset seal margin of the bottom surface portion are joined.

4. The paper container with a chuck according to any one of claims 1 to 3, wherein the tip gusset of the bottom gusset protrusion is joined to the bottom surface portion.

5. The paper container with a chuck according to any one of claims 1 to 4, wherein the bottom gusset protrusion has an inclination that rises upward from the outside to the inside in the width direction of the paper container with a chuck.

6. The paper container with a chuck according to any one of claims 1 to 5, wherein the distance between the bottom gusset protrusion and the bottom surface portion is the largest in the width direction of the paper container with a chuck in the intermediate region between the bent portion of the bottom gusset protrusion at the bottom and the joining portion of the bottom gusset protrusion and the bottom surface portion.

7. The paper container with a chuck according to any one of claims 1 to 6, having a tip bending portion extending in the front-rear direction of the paper container with a chuck near the tip portion of the bottom gusset protrusion.

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