Paper container with lid

Abstract

To provide a paper container with lid capable of improving the sealing performance.SOLUTION: A paper container with lid 1 comprises a paper-made container 10 having a paper container 20 and a molded film 40 laminated on a surface of the paper container 20, and a lid 50 that seals the paper-made container 10. The paper container 20 has a bottom 21, a plurality of side portions 23 connected to the bottom 21 via a first fold line 22, and a plurality of flange pieces 25 respectively connected to the side portions 23 via a second fold line 24. The side portions 23 are adjacent to one another and are not continuous with one another. The lid 50 is sealed to the molded film 40 by a seal portion H formed around an entire periphery. The seal portion H is formed at a position where it does not overlap the flange pieces 25 in a plan view.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present disclosure relates to a paper container with a lid. [Background technology]

[0002] Containers for storing food and drink to be taken home (so-called take-out products) or food and drink to be delivered to home have been known.

[0003] In recent years, in order to address the problem of marine pollution and reduce the environmental load, there has been a demand for reducing the amount of resin used in such containers, and efforts are being made to reduce the amount of resin and change the materials used in the containers. As such a container, a paper container is known that includes a paper container having a flange piece and a molded film laminated on the inner wall of the paper container (for example, Patent Document 1). In such a paper container, after the food is filled, the paper container is covered with a lid material. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Special Publication No. 2013-545675 Summary of the Invention [Problem to be solved by the invention]

[0005] However, there is a demand for improved sealing performance in such paper containers with lids.

[0006] The present disclosure has been made in consideration of these points, and aims to provide a paper container with a lid that can improve sealing performance. [Means for solving the problem]

[0007] The embodiments of the present disclosure relate to the following [1] to [5].

[0008] [1] A paper container having a paper container and a formed film laminated on a surface of the paper container; A lid material that seals the paper container, The paper container is The bottom and A plurality of side portions connected to the bottom portion via first fold lines; a plurality of flange pieces connected to each side portion via a second fold line, The side portions are adjacent to each other and are not continuous with each other, The lid is sealed to the molded film by a seal portion formed around the entire periphery, A paper container with a lid, wherein the sealing portion is formed at a position that does not overlap the flange piece when viewed in a plan view.

[0009] [2] The paper container with lid material described in [1], wherein a gripping portion where the lid material and the formed film are not sealed is formed on the outside of the sealed portion.

[0010] [3] The plurality of flange pieces include a first flange piece, a second flange piece, and a third flange piece adjacent to each other, The second fold line adjacent to the second flange piece is shorter than the second fold line adjacent to the first flange piece and the second fold line adjacent to the third flange piece, The paper container with lid described in [2], wherein the gripping portion is formed on the outside of the portion of the sealing portion that surrounds the second flange piece.

[0011] [4] The paper container with a lid described in [3], wherein the width of the second flange piece is wider than the width of the first flange piece and the width of the third flange piece.

[0012] [5] The paper container with a lid described in any one of [1] to [4], wherein an unsealed portion is formed between the outer edge of the sealed portion and the outer edge of the lid. Effect of the Invention

[0013] According to the present disclosure, the sealing performance of a paper container with a lid can be improved. [Brief description of the drawings]

[0014] [Figure 1] FIG. 1 is a vertical cross-sectional view showing a paper container with a lid according to this embodiment. [Diagram 2] FIG. 2 is a perspective view showing a paper container with a lid according to this embodiment. [Diagram 3] FIG. 3 is a plan view showing a paper container with a lid according to this embodiment. [Figure 4] FIG. 4 is a perspective view showing a paper container according to the present embodiment. [Diagram 5] FIG. 5 is a plan view showing the paper container according to the present embodiment. [Figure 6] FIG. 6 is a plan view showing a blank according to this embodiment. [Figure 7] FIG. 7 is a cross-sectional view showing a method for manufacturing a paper container according to this embodiment. [Figure 8] FIG. 8 is a cross-sectional view showing a method for manufacturing a paper container according to this embodiment. [Figure 9] FIG. 9 is a cross-sectional view showing a method for manufacturing a paper container according to this embodiment. [Figure 10] FIG. 10 is a plan view showing a first modified example of a paper container with a lid according to the present embodiment. [Figure 11] FIG. 11 is a plan view showing a second modified example of a paper container with a lid according to the present embodiment. [Figure 12] FIG. 12 is a plan view showing a third modified example of a paper container with a lid according to the present embodiment. [Figure 13] FIG. 13 is a plan view showing a fourth modified example of a paper container with a lid according to the present embodiment. [Figure 14] FIG. 14 is a plan view showing a fourth modified example of the blank piece according to the present embodiment. [Figure 15]FIG. 15 is a plan view showing a fifth modified example of a paper container with a lid according to the present embodiment. [Figure 16] FIG. 16 is a plan view showing a fifth modified example of the blank piece according to the present embodiment. [Figure 17] FIG. 17 is a plan view showing a sixth modified example of a paper container with a lid according to the present embodiment. [Figure 18] FIG. 18 is a plan view showing a sixth modified example of the blank piece according to the present embodiment. [Figure 19] FIG. 19 is a plan view showing a seventh modified example of a paper container with a lid according to the present embodiment. [Figure 20] FIG. 20 is a plan view showing an eighth modified example of a paper container with a lid according to the present embodiment. [Figure 21] FIG. 21 is a plan view showing a ninth modified example of a paper container with a lid according to the present embodiment. [Figure 22] FIG. 22 is a plan view showing the paper container with a lid of Comparative Example 1. FIG. [Figure 23] FIG. 23 is a plan view showing a blank for producing a paper container with a lid of Comparative Example 2. As shown in FIG. [Figure 24] FIG. 24 is a plan view showing a paper container with a lid of Comparative Example 2. As shown in FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0015] Hereinafter, the present embodiment will be described with reference to the drawings. FIGS. 1 to 9 are diagrams showing the present embodiment. Each of the following diagrams is a schematic diagram. Therefore, the size and shape of each part are appropriately exaggerated to facilitate understanding. In addition, the present invention can be modified appropriately within the scope of the technical concept. In each of the following diagrams, the same parts are given the same reference numerals, and some detailed explanations may be omitted. In addition, the numerical values ​​such as the dimensions of each member and the material names described in this specification are examples of the embodiment, and are not limited thereto, and can be appropriately selected and used. In this specification, terms that specify shapes and geometric conditions, such as parallel, orthogonal, and vertical, are interpreted to include substantially the same state in addition to their strict meanings.

[0016] In the following embodiments, the "X direction" refers to a direction parallel to the longitudinal direction of the paper container with a lid. The "Y direction" refers to a direction perpendicular to the X direction and parallel to the width direction of the paper container with a lid. The "Z direction" refers to a direction perpendicular to both the X direction and the Y direction and parallel to the height direction of the paper container with a lid. In this specification, "upper" and "lower" refer to the upper side (positive side in the Z direction) and the lower side (positive side in the Z direction) of the paper container in an upright state (FIG. 1), respectively. In addition, in this specification, the "outer side" refers to the side away from the center of the bottom or the center of the bottom panel in a plan view. In addition, in this specification, the "front surface" refers to the surface facing the contents or the surface facing upward when the paper container is upright (positive surface in the Z direction). In addition, in this specification, the "rear surface" refers to the surface opposite to the front surface.

[0017] Paper container with lid As shown in Figures 1 to 3, a paper container with a lid 1 according to this embodiment comprises a paper container 10 and a lid 50 that seals the paper container 10. First, the paper container 10 will be described.

[0018] Paper containers 1 to 3, the paper container 10 includes a paper container 20 and a formed film 40 laminated on the surface of the paper container 20. The paper container 20 is a container produced by assembling blank pieces 30 described below.

[0019] (Paper container) As shown in Figures 4 and 5, the paper container 20 has a bottom 21, a plurality of side portions 23 connected to the bottom 21 via a first fold line 22, and a plurality of flange pieces 25 connected to each of the side portions 23 via a second fold line 24.

[0020] The bottom 21 has a generally pentagonal shape in plan view. The bottom 21 may have a polygonal shape such as a square or octagonal shape in plan view.

[0021] The first fold line 22 connecting the bottom 21 and the side 23 may be formed in a perforated shape or may be a half-cut line. This makes it easier to fold the side 23 relative to the bottom 21. When the first fold line 22 is formed in a perforated shape, the formed film 40 is pressed against the paper container 20 in the vicinity of the first fold line 22 by sucking air through a suction hole 61 of a cavity side die 60 described below. This improves the adhesion between the formed film 40 and the paper container 20.

[0022] Each of the side portions 23 extends upward from the bottom portion 21. In the present embodiment, the multiple side portions 23 include a first side portion 23a to a fifth side portion 23e adjacent to each other, and the side portions 23 are formed as a whole in an inverted pentagonal pyramid shape. However, this is not limited thereto, and the side portions 23 may be formed as a whole in a polygonal pyramid shape such as an inverted square pyramid shape or an inverted octagonal pyramid shape.

[0023] The multiple side portions 23 are adjacent to each other without being continuous with each other. In other words, the side portions 23 are adjacent to each other without overlapping each other. Note that between each side portion 23, a small gap is formed to allow air to pass through, and the molded film 40 is pressed against the paper container 20 by sucking air through a suction hole 61 of a cavity side mold 60 described later.

[0024] The second fold line 24 connecting the side portion 23 and the flange piece 25 may be formed in a perforated shape, similar to the first fold line 22, or may be a half-cut line. This makes it easier to fold the flange piece 25 relative to the side portion 23. When the second fold line 24 is formed in a perforated shape, the formed film 40 is pressed against the paper container 20 in the vicinity of the second fold line 24 by sucking air through suction holes 61 of the cavity side die 60 described below. This improves the adhesion between the formed film 40 and the paper container 20.

[0025] Each flange piece 25 protrudes horizontally from the upper end of the side portion 23 toward the side. The flange pieces 25 are formed into an annular shape as a whole. Furthermore, the flange pieces 25 are adjacent to each other, so that corners C are formed by the flange pieces 25. In the illustrated example, five corners C are formed by the flange pieces 25.

[0026] In this embodiment, the multiple flange pieces 25 include the first flange piece 25a to the fifth flange piece 25e that are adjacent to each other. At least a part of the outer edge of the second flange piece 25b is convex toward the outside, and the shape of the outer edge of the second flange piece 25b is different from the shape of the outer edge of the corner C formed by the other flange pieces 25. In this embodiment, the outer edge of the second flange piece 25b extends along a direction that is inclined in both the longitudinal direction and the width direction (Y direction) of the paper container 20, and the outer edge of the second flange piece 25b is formed into a V shape as a whole. Meanwhile, the outer edge of the first flange piece 25a and the outer edge of the fourth flange piece 25d each extend along the longitudinal direction (X direction) of the paper container 20. In addition, the outer edge of the third flange piece 25c and the outer edge of the fifth flange piece 25e each extend along the width direction (Y direction) of the paper container 20.

[0027] The second fold line 24 adjacent to the second flange piece 25b is shorter than the second fold line 24 adjacent to the first flange piece 25a and the second fold line 24 adjacent to the third flange piece 25c. In this case, the second fold line 24 adjacent to the first flange piece 25a may be shorter than the second fold line 24 adjacent to the fourth flange piece 25d, and may be longer than the second fold line 24 adjacent to the third flange piece 25c and the second fold line 24 adjacent to the fifth flange piece 25e. Also, the second fold line 24 adjacent to the third flange piece 25c may be shorter than the second fold line 24 adjacent to the fourth flange piece 25d and the second fold line 24 adjacent to the fifth flange piece 25e. Furthermore, the second fold line 24 adjacent to the fourth flange piece 25d may be longer than the second fold line 24 adjacent to the fifth flange piece 25e. That is, the length of the second fold line 24 may be shortest in the order of the second fold line 24 adjacent to the fourth flange piece 25d, the second fold line 24 adjacent to the first flange piece 25a, the second fold line 24 adjacent to the fifth flange piece 25e, the second fold line 24 adjacent to the third flange piece 25c, and the second fold line 24 adjacent to the second flange piece 25b.

[0028] Also, as shown in FIG. 5, the width W2 of the second flange piece 25b may be wider than the width W1 of the first flange piece 25a and the width W3 of the third flange piece 25c. In this case, the width W1 of the first flange piece 25a and the width W3 of the third flange piece 25c may be equal to each other. Also, the width of the fourth flange piece 25d and the width of the fifth flange piece 25e may be equal to the width W1 of the first flange piece 25a and the width W3 of the third flange piece 25c, respectively. Note that the width of a flange piece refers to the length of the target flange piece along a direction perpendicular to the second fold line 24 adjacent to the target flange piece. For example, the width W1 of the first flange piece 25a refers to the length of the first flange piece 25a along a direction perpendicular to the second fold line 24 adjacent to the first flange piece 25a (Y direction).

[0029] The multiple flange pieces 25 are adjacent to each other without being continuous with each other. That is, the flange pieces 25 are adjacent to each other without overlapping each other. This improves the adhesion between the flange pieces 25 and the molded film 40 over the entire circumference of the paper container 20. Also, because the flange pieces 25 are adjacent to each other without overlapping each other, it is possible to prevent pinholes and the like from occurring in the molded film 40 when the molded film 40 is bonded to the paper container 20.

[0030] (Blank material) Next, a description will be given of a blank 30 for producing the paper container 20. As shown in Fig. 6, the blank 30 includes a bottom panel 31, a plurality of side panels 33 connected to the bottom panel 31 via a first fold line 32, and a plurality of flange piece panels 35 connected to each of the side panels 33 via a second fold line 34. Among these, a gap 36 is formed between the side panels 33.

[0031] The bottom panel 31, first fold line 32, side panel 33, second fold line 34 and flange piece panel 35 of the blank 30 correspond to the bottom 21, first fold line 22, side 23, second fold line 24 and flange piece 25 of the paper container 20, respectively. Therefore, the multiple side panels 33 include adjacent first side panel 33a to fifth side panel 33e. The first side panel 33a to fifth side panel 33e are panels that correspond to the first side 23a to fifth side 23e of the paper container 20, respectively.

[0032] The first side panel 33a to the fifth side panel 33e are each formed in a trapezoidal shape. Specifically, each side panel 33 has a pair of side edges 33f extending from the bottom panel 31. In the first side panel 33a, the side edge 33f on the second side panel 33b side extends along the Y direction. In the first side panel 33a, the side edge 33f on the opposite side to the second side panel 33b extends in a direction away from the side edge 33f on the second side panel 33b side as it moves from the first fold line 32 side toward the second fold line 34 side. In the third side panel 33c, the side edge 33f on the second side panel 33b side extends along the X direction. In the third side panel 33c, the side edge 33f opposite the second side panel 33b extends in a direction away from the side edge 33f of the second side panel 33b as it moves from the first fold line 32 side toward the second fold line 34 side. Meanwhile, in the second side panel 33b, the fourth side panel 33d, and the fifth side panel 33e, the pair of side edges 33f extend in a direction away from each other as it moves from the first fold line 32 side toward the second fold line 34 side. With this configuration, in the paper container 10 described above, the sides 23 do not overlap each other but are adjacent to each other (see FIGS. 2 to 4).

[0033] As described above, the flange piece panel 35 of the blank 30 corresponds to the flange piece 25 of the paper container 20. The flange piece panels 35 include the first flange piece panel 35a to the fifth flange piece panel 35e that face each other with a gap 36 therebetween. The first flange piece panel 35a to the fifth flange piece panel 35e correspond to the first flange piece 25a to the fifth flange piece 25e of the paper container 20, respectively. For this reason, at least a part of the outer edge of the second flange piece panel 35b is convex toward the outside, and the shape of the outer edge of the second flange piece panel 35b is different from the shape of the outer edge of the corner (corner C (see Figs. 4 and 5)) formed by the other flange piece panels 35 when the blank 30 is assembled. In addition, the second fold line 34 adjacent to the second flange piece panel 35b is shorter than the second fold line 34 adjacent to the first flange piece panel 35a and the second fold line 34 adjacent to the third flange piece panel 35c. 6, the width W5 of the second flange piece panel 35b may be wider than the width W4 of the first flange piece panel 35a and the width W6 of the third flange piece panel 35c. The width of a flange piece panel refers to the length of a target flange piece panel along a direction perpendicular to the second fold line 34 adjacent to the target flange piece panel. For example, the width W4 of the first flange piece panel 35a refers to the length of the first flange piece panel 35a along a direction perpendicular to the second fold line 34 adjacent to the first flange piece panel 35a (Y direction).

[0034] The bottom panel 31, the side panel 33 and the flange piece panel 35 of the blank 30 are integrally formed. The blank 30 can be produced by subjecting the paper material that constitutes the blank 30 to a punching process or the like.

[0035] The blank 30 is made of a paper material having a basis weight of, for example, 150 g / m 2 More than 800g / m 2 The following types of paperboard, coated paper, card paper, ivory paper, milk carton base paper, cup base paper, coated cardboard, and other processed papers can be used.

[0036] (Formed film) Next, the molded film 40 will be described with reference to Figs. 1 to 3. This molded film 40 plays a role in protecting the paper container 20. The molded film 40 has a container shape and covers the entire surface of the paper container 20. This prevents the contents filled in the paper container 10 from leaking out of the paper container 10. The molded film 40 is attached to the paper container 20 by, for example, heat sealing (thermal welding). In this embodiment, the planar shape of the molded film 40 is larger than the planar shape of the paper container 20. Therefore, the molded film 40 spreads around the flange piece 25 of the paper container 20 in a plan view. The planar shape of the molded film 40 is rectangular. Therefore, as shown in Figs. 2 and 3, the molded film has four corners C1.

[0037] Such a molded film 40 may be a film made of a thermoplastic resin having water resistance, sealing property, and heat fusion property. For example, various types of polyethylene (PE), polypropylene (PP), polyvinyl chloride, polyethylene terephthalate (PET), ethylene-vinyl acetate copolymer, ionomer, ethylene-acrylic acid copolymer, polyamide, polyvinylidene chloride, polystyrene, saponified ethylene-vinyl acetate copolymer, polycarbonate, polybutene, polyvinyl alcohol, and other various thermoplastic resin films can be used alone or laminated. In particular, when gas barrier properties are to be imparted to the paper container 10, a laminate having a gas barrier material such as ethylene-vinyl alcohol copolymer (EVOH) laminated on the intermediate layer, specifically, a laminate having a layer structure such as PE / EVOH / PE, PP / EVOH / PE, or A (amorphous)·PET / EVOH / PE can be used. In addition, " / " means the boundary between adjacent layers.

[0038] The formed film 40 may be made, for example, from a laminate having the following layer configuration: (Back side) Polyethylene (40 μm) / Ionomer (40 μm) / Polyethylene (40 μm) (Front side) (Back side) Polypropylene (30 μm) / Adhesive layer (10 μm) / Ionomer (40 μm) / Adhesive layer (10 μm) / Polypropylene (30 μm) (Front side) (Back side) Polyethylene (20μm) / Ionomer (30μm) / Adhesive layer (10μm) / Ethylene-vinyl alcohol copolymer (10μm) / Adhesive layer (10μm) / Ionomer (15μm) / Ethylene-vinyl acetate copolymer (20μm) (Front side)

[0039] Each of the above layers is formed according to a conventional method, such as dry lamination, extrusion lamination, extrusion coating, or other coating method.

[0040] Lid material Next, the lid material 50 will be described with reference to Fig. 3. As described above, the lid material 50 is a member that seals the paper container 10. The planar shape of this lid material 50 is substantially the same as the planar shape of the molded film 40, and is rectangular. Therefore, the lid material 50 has four corners C2 corresponding to the corners C1 of the molded film 40.

[0041] The lid material 50 is sealed to the molded film 40 by a seal portion H formed around the entire periphery. The seal portion H is formed at a position that does not overlap the flange piece 25 in a plan view. In other words, the seal portion H is formed around the flange piece 25. In addition, a first unsealed portion NH1 is formed between the flange piece 25 and the seal portion H in a plan view. A second unsealed portion (unsealed portion) NH2 is formed between the outer edge of the seal portion H and the outer edge of the lid material 50. In other words, the second unsealed portion NH2 is formed around the seal portion H. The width of the second unsealed portion NH2 may be 5 mm or less. Here, the first unsealed portion NH1 and the second unsealed portion NH2 are each a portion where the lid material 50 is not sealed to the molded film 40. In the following description, the portion where the lid material 50 is not sealed to the molded film 40 is also simply referred to as "NH".

[0042] As described above, the seal portion H is formed at a position that does not overlap the flange piece 25 in a plan view. Therefore, the seal portion H surrounds the flange piece 25 over its entire circumference. In this embodiment, the seal portion H extends along the outer edge of the flange piece 25. The distance between the outer edge of the flange piece 25 and the inner edge of the seal portion H may be 0 mm or more and 10 mm or less. By separating the seal portion H from the flange piece 25, even if positional deviation occurs due to mechanical precision of the sealing device, it is possible to prevent the seal portion H from being formed on the flange piece 25. This makes it possible to improve production efficiency during sealing.

[0043] Further, a gripping portion 55 is formed on the outside of the sealed portion H where the lid material 50 and the molded film 40 are not sealed. This gripping portion 55 is a portion formed at the corners C1 and C2 of the second unsealed portion NH2 formed around the sealed portion H. In this embodiment, gripping portions 55 are formed at all of the corners C1 and C2. By providing such gripping portions 55, when peeling the lid material 50 from the molded film 40, the lid material 50 can be easily peeled from the molded film 40 starting from the gripping portion 55.

[0044] The knob portion 55 is preferably formed on the outside of the portion of the seal portion H that surrounds the second flange piece 25b.

[0045] The lid material 50 may be a laminate having a layer structure such as PET / sealant layer, PP / sealant layer, PET / PP / sealant layer, PET / PE / sealant layer, or K-coated oriented nylon (KON) / PE / sealant layer. The laminate constituting the lid material 50 may be a laminate having a gas barrier material such as ethylene-vinyl alcohol copolymer (EVOH) laminated in the middle layer. The lid material 50 may be a laminate having a layer structure such as PET / PE / ethylene-vinyl alcohol copolymer (EVOH) / PE / sealant layer. The barrier layer may be an aluminum foil or a vapor deposition film (aluminum vapor deposition or transparent vapor deposition). The sealant is preferably a resin material that can exhibit so-called easy peel properties.

[0046] The lid material 50 may be made of a laminate having the following layer structure, for example. (Opposite side of contents) Polyethylene terephthalate film with transparent vapor deposition layer (12 μm) / Nylon film (15 μm) / Polyethylene film (40 μm) (contents side)

[0047] Each of the above layers is formed according to a conventional method, such as dry lamination, extrusion lamination, extrusion coating, or other coating method.

[0048] In the paper container with lid 1 having such a configuration, first, the contents are filled into the paper container 10. Next, the lid 50 is sealed to the forming film 40 of the paper container 10 by the seal part H. This results in a paper container with lid 1 filled with the contents. The paper container with lid 1 may be a container for chilled or frozen foods, or may be used as a take-out container. The contents may also be food such as prepared dishes, meat, dairy products, etc.

[0049] Next, the operation of the present embodiment having such a configuration will be described. Here, a method for manufacturing the paper container 10 and a method for manufacturing the paper container 1 with a lid material will be described with reference to Figs.

[0050] Manufacturing method of paper container First, prepare the blank piece 30. At this time, a paper material is prepared, and the blank piece 30 is obtained by punching out the paper material with a die-cutting machine or the like.

[0051] Next, as shown in Fig. 7, the blank 30 is attached to a cavity side mold 60. A suction hole 61 is formed in this cavity side mold 60, and the blank 30 is attached to the cavity side mold 60 by sucking air through the suction hole 61. At this time, the side panel 33 of the blank 30 is folded relative to the bottom panel 31 along the first fold line 32. Similarly, the flange piece panel 35 of the blank 30 is folded relative to the side panel 33 along the second fold line 34. In this way, the paper container 20 attached to the cavity side mold 60 is obtained.

[0052] Next, the molded film 40 is laminated on the surface of the paper container 20. At this time, first, as shown in FIG. 8, the film 40a constituting the molded film 40 is placed above the paper container 20. Next, the film 40a is heated by the hot plate 62. Then, after the film 40a has been sufficiently heated by the hot plate 62, air is sucked through the suction holes 61. As a result, the film 40a is sucked onto the paper container 20 as shown in FIG. 9. As a result, the film 40a is in close contact with the paper container 20, and the molded film 40 laminated on the paper container 20 is obtained as shown in FIG. In this manner, the paper container 10 is obtained.

[0053] Next, a method for manufacturing the lidded paper container 1 will be described.

[0054] First, in parallel with the production of the paper container 10, a laminate is prepared as the lid material 50. At this time, a predetermined laminate is produced by a dry lamination method or the like.

[0055] Next, the paper container 10 is filled with the contents, and the paper container 10 is sealed with the laminate. At this time, the contents (not shown) are first filled into the paper container 10. Next, the laminate is placed on the forming film 40 at a position corresponding to the flange piece 25.

[0056] Next, the laminate is sealed to the molded film 40 by a sealing hot plate (not shown) or the like. The laminate is sealed to the molded film 40 by a seal part H formed around the entire periphery. At this time, the air inside the paper container 10 may be replaced by, for example, nitrogen gas. Here, when forming the seal part H, only the molded film 40 and the laminate are sandwiched around the flange piece 25 by a sealing hot plate (not shown). This ensures that the laminate is sealed to the molded film 40 around the entire periphery. Thereafter, the molded film 40 and the laminate are cut into a predetermined shape by a blade or the like.

[0057] In this manner, a paper container with lid 1 is obtained, which comprises the paper container 10 and the lid 50 that seals the paper container 10.

[0058] As described above, according to this embodiment, the seal portion H is formed at a position that does not overlap the flange piece 25 in a plan view. This improves the sealing performance of the paper container 1 with a lid material. That is, even if a gap is formed between the flange pieces 25, the lid material 50 can be reliably sealed to the formed film 40 over the entire circumference. In addition, even if a step is formed between the flange pieces 25 due to the overlapping of the flange pieces 25, the lid material 50 can be reliably sealed to the formed film 40 over the entire circumference. Furthermore, since the seal portion H is formed at a position that does not overlap the flange piece 25 in a plan view, the seal portion H of any shape can be easily formed without being influenced by the shape of the flange piece 25. Therefore, by devising the shape of the seal portion H, the position for opening the paper container 1 with a lid material can be set relatively freely.

[0059] Furthermore, according to this embodiment, a gripping portion 55 where the lid material 50 and the molded film 40 are not sealed is formed on the outside of the sealed portion H. This allows the lid material 50 to be easily peeled from the molded film 40 starting from the gripping portion 55 when peeling the lid material 50 from the molded film 40.

[0060] Furthermore, according to this embodiment, the second fold line 24 adjacent to the second flange piece 25b is shorter than the second fold line 24 adjacent to the first flange piece 25a and the second fold line 24 adjacent to the third flange piece 25c. This makes the second flange piece 25b stand out. Also, the gripping portion 55 is formed on the outside of the portion of the seal portion H that surrounds the second flange piece 25b. This allows consumers to easily determine the position where to open the lid-attached paper container 1. As a result, it becomes easier for consumers to peel the lid material 50 from the formed film 40.

[0061] Furthermore, according to this embodiment, a second unsealed portion NH2 is formed between the outer edge of the sealed portion H and the outer edge of the lid material 50. This makes it possible to peel the lid material 50 from the molded film 40 using the second unsealed portion NH2 as a starting point, making it easier to peel the lid material 50.

[0062] Variations Next, modified examples of the paper container with lid 1 and the blank 30 according to the present embodiment will be described with reference to Figures 10 to 21. In Figures 10 to 21, the same parts as those in the embodiment shown in Figures 1 to 9 are designated by the same reference numerals and detailed description thereof will be omitted.

[0063] (First Modification) In the example shown in FIG. 10, a corner C1 of the formed film 40 and a corner C2 of the lid material 50 are partially chamfered in a curved shape.

[0064] According to this modification, the grip portion 55 provided at the position where the paper container with lid 1 is opened can be made conspicuous. This allows consumers to easily know the position where the paper container with lid 1 is opened, making it easier to peel the lid 50 from the formed film 40. In addition, because the corner C1 of the formed film 40 and a part of the corner C2 of the lid 50 are curvedly chamfered, it is possible to prevent the paper container with lid 1 from being opened from a part other than the grip portion 55 provided at the position where the paper container with lid 1 is opened.

[0065] (Second Modification) 11, no second unsealed portion NH2 other than the gripping portion 55 is formed between the outer edge of the sealed portion H and the outer edge of the lid material 50. In this case, in the region where the gripping portion 55 is not formed, the outer edge of the sealed portion H coincides with the outer edge of the lid material 50. Also, in the region where the gripping portion 55 is not formed, the outer edge of the sealed portion H coincides with the outer edge of the molded film 40.

[0066] In this modified example, the grip portion 55 can also be made conspicuous. This allows consumers to easily grasp the position where to open the lid-equipped paper container 1, making it easier to peel the lid 50 from the formed film 40. In addition, opening of the lid-equipped paper container 1 from a portion other than the grip portion 55 can be prevented.

[0067] (Third Modification) In the example shown in FIG. 12, at least a part of the outer edge of the seal portion H surrounding at least one flange piece 25 is convex toward the outside. In this modified example, at least a part of the outer edge of the seal portion H surrounding the second flange piece 25b is convex toward the outside. Although not shown, at least a part of the outer edge of the seal portion H surrounding the flange pieces 25 other than the second flange piece 25b may be convex toward the outside. That is, at least a part of the outer edge of the seal portion H surrounding at least one of the flange pieces 25 of the first flange piece 25a, the third flange piece 25c, the fourth flange piece 25d, and the fifth flange piece 25e may be convex toward the outside.

[0068] In this modification, part of the outer edge of the sealed portion H that surrounds the second flange piece 25b extends along a direction that is inclined in both the longitudinal direction (X direction) and the width direction (Y direction) of the paper container 20. In this case, part of the outer edge of the sealed portion H that surrounds the second flange piece 25b extends along a direction that is inclined toward the second fold line 24 to which the second flange piece 25b is adjacent. The outer edge of that part of the sealed portion H includes a portion that is formed in a V shape.

[0069] On the other hand, the outer edge of the portion of the seal portion H surrounding the first flange piece 25a, the third flange piece 25c, the fourth flange piece 25d, and the fifth flange piece 25e extends along the longitudinal direction of the first flange piece 25a, the third flange piece 25c, the fourth flange piece 25d, or the fifth flange piece 25e, respectively. For example, the outer edge of the portion of the seal portion H surrounding the first flange piece 25a or the fourth flange piece 25d extends along the longitudinal direction (X direction) of the first flange piece 25a and the fourth flange piece 25d, respectively. In addition, the outer edge of the portion of the seal portion H surrounding the third flange piece 25c or the fifth flange piece 25e extends along the longitudinal direction (Y direction) of the third flange piece 25c and the fifth flange piece 25e, respectively.

[0070] According to this modification, at least a part of the outer edge of the portion of the seal portion H that surrounds the second flange piece 25b is convex toward the outside. This makes it possible for a portion of the seal portion H to be a trigger for peeling when peeling the lid material 50 from the formed film 40. This improves the ease of opening the lid-attached paper container 1.

[0071] (Fourth Modification) 13, the outer edge of the second flange piece 25b is curved so as to be convex outward. In this case, the outer edge of the second flange piece 25b is formed in an arc shape.

[0072] In this modification, the outer edge of the second flange piece panel 35b is curved so as to be convex outward, as shown in Fig. 14. In this case, the outer edge of the second flange piece panel 35b is formed in an arc shape.

[0073] In this modified example as well, when the lid material 50 is peeled off from the formed film 40, a portion that may cause peeling may be generated in the sealed portion H. This makes it possible to improve the ease of opening the lid-fitted paper container 1.

[0074] (Fifth Modification) In the example shown in Fig. 15, only a part of the outer edge of the second flange piece 25b is convex toward the outside. In this case, only the outer edge of the center part of the second flange piece 25b is convex toward the outside. And, the outer edge of the center part of the second flange piece 25b is formed into an L shape as a whole.

[0075] In this modification, as shown in Fig. 16, only a part of the outer edge of the second flange piece panel 35b is convex toward the outside. In this case, only the outer edge of the center part of the second flange piece panel 35b is convex toward the outside. And, the outer edge of the center part of the second flange piece panel 35b is formed into an L shape as a whole.

[0076] In this modified example as well, when the lid material 50 is peeled off from the formed film 40, a portion that may cause peeling may be generated in the sealed portion H. This makes it possible to improve the ease of opening the lid-fitted paper container 1.

[0077] (Sixth Modification) In the example shown in FIG. 17, the bottom 21 of the paper container 20 has a generally rectangular shape in a plan view.

[0078] In this modification, as shown in FIG. 18, the bottom panel 31 has a generally rectangular shape in a plan view.

[0079] In this modified example as well, the seal portion H is formed in a position that does not overlap the flange piece 25 in a plan view. This can improve the sealing performance of the paper container 1 with a lid material.

[0080] (Seventh Modification) 19, the bottom 21 of the paper container 20 has a generally rectangular shape in a plan view. Also, a corner C1 of the formed film 40 and a corner C2 of the lid material 50 are partially chamfered in a curved shape.

[0081] According to this modification, the grip portion 55 provided at the position where the paper container with lid 1 is opened can be made conspicuous. This allows consumers to easily know the position where the paper container with lid 1 is opened, making it easier to peel the lid 50 from the formed film 40. In addition, because the corner C1 of the formed film 40 and a part of the corner C2 of the lid 50 are curvedly chamfered, it is possible to prevent the paper container with lid 1 from being opened from a part other than the grip portion 55 provided at the position where the paper container with lid 1 is opened.

[0082] (Eighth Modification) 20, the bottom 21 of the paper container 20 has a generally rectangular shape in a plan view. In addition, the second unsealed portion NH2 other than the gripping portion 55 is not formed between the outer edge of the sealed portion H and the outer edge of the lid material 50. In this case, in the area where the gripping portion 55 is not formed, the outer edge of the sealed portion H and the outer edge of the lid material 50 coincide. In addition, in the area where the gripping portion 55 is not formed, the outer edge of the sealed portion H and the outer edge of the formed film 40 coincide.

[0083] In this modified example, the grip portion 55 can also be made conspicuous. This allows consumers to easily grasp the position where to open the lid-equipped paper container 1, making it easier to peel the lid 50 from the formed film 40. In addition, opening of the lid-equipped paper container 1 from a portion other than the grip portion 55 can be prevented.

[0084] (Ninth Modification) 21, the outer edge of the portion of the sealed portion H that surrounds the gripping portion 55 extends in a straight line. In this modification, the outer edge of the portion of the sealed portion H that surrounds the gripping portion 55 extends in a direction that is inclined in both the longitudinal direction (X direction) and the width direction (Y direction) of the paper container 20.

[0085] In this modification, the grip portion 55 provided at the position for opening the lid-attached paper container 1 can be made conspicuous. This allows consumers to easily grasp the position for opening the lid-attached paper container 1, and makes it easier to peel the lid material 50 from the forming film 40. EXAMPLES

[0086] Next, a specific example of the above embodiment will be described.

[0087] Example 1 First, the blank material 30 shown in Fig. 6 was produced. In this case, the blank material 30 was made of a material having a basis weight of 350 g / m 2 The coated paper was then punched out into a predetermined shape to produce a blank 30.

[0088] Further, as the molded film 40, a film (thickness: 120 μm) having the following layer structure was prepared. PE(40μm) / Ionomer(40μm) / PE(40μm)

[0089] Next, the obtained blank 30 was attached to a cavity side mold 60 and assembled to produce a paper container 20. Then, a film was laminated on the surface of the paper container 20 to produce a paper container 10.

[0090] Next, a film having the following layer structure was prepared as the lid material 50, and the paper container 10 was sealed with the film. PET(12μm) / PE(50μm) In this manner, a paper container with a lid 1 shown in Figs. 1 to 3 was produced.

[0091] Next, the sealing property of the paper container 1 with lid was confirmed. Specifically, the lid was sealed in a state where a small amount of highly permeable test liquid was filled. Then, the sealed portion was sufficiently exposed to the test liquid, and the container was stored for 24 hours. Thereafter, leakage of the test liquid was confirmed in the paper container 1 with lid. Microcheck Penetrant Liquid (manufactured by Ichino Chemicals Co., Ltd.) was used as the test liquid.

[0092] Next, the lid material 50 was peeled off from the formed film 40 to check the openability of the lid-attached paper container 1.

[0093] Thereafter, the forming film 40 was peeled off from the paper container 20 to confirm the releasability of the forming film 40 to the paper container 20.

[0094] Example 2 The paper container with lid 1 shown in Figure 10 was produced in the same manner as in Example 1, except that the sealing ability of the paper container with lid 1, the openability of the paper container with lid 1, and the peelability of the molded film 40 from the paper container 20 were confirmed.

[0095] Example 3 The paper container with lid 1 shown in Figure 11 was produced in the same manner as in Example 1, except that the sealing ability of the paper container with lid 1, the openability of the paper container with lid 1, and the peelability of the molded film 40 from the paper container 20 were confirmed.

[0096] Example 4 The paper container with lid material 1 shown in Figure 12 was produced in the same manner as in Example 1, except that the sealing ability of the paper container with lid material 1, the openability of the paper container with lid material 1, and the peelability of the molded film 40 from the paper container 20 were confirmed.

[0097] Example 5 Except for producing the blank material 30 shown in Figure 14 and the paper container with lid material 1 shown in Figure 13, the sealing ability of the paper container with lid material 1, the openability of the paper container with lid material 1, and the peelability of the molded film 40 from the paper container 20 were confirmed in the same manner as in Example 1.

[0098] Example 6 Except for producing the blank material 30 shown in Figure 16 and the paper container with lid material 1 shown in Figure 15, the same procedures as in Example 1 were performed to confirm the sealing ability of the paper container with lid material 1, the openability of the paper container with lid material 1, and the peelability of the molded film 40 from the paper container 20.

[0099] Example 7 Except for producing the blank material 30 shown in Figure 18 and the paper container with lid material 1 shown in Figure 17, the sealing ability of the paper container with lid material 1, the openability of the paper container with lid material 1, and the peelability of the molded film 40 from the paper container 20 were confirmed in the same manner as in Example 1.

[0100] Example 8 The paper container with lid material 1 shown in Figure 19 was produced in the same manner as in Example 1, except that the sealing ability of the paper container with lid material 1, the openability of the paper container with lid material 1, and the peelability of the molded film 40 from the paper container 20 were confirmed.

[0101] Example 9 The paper container with lid material 1 shown in Figure 20 was produced in the same manner as in Example 1, except that the sealing ability of the paper container with lid material 1, the openability of the paper container with lid material 1, and the peelability of the molded film 40 from the paper container 20 were confirmed.

[0102] Example 10 The paper container with lid material 1 shown in Figure 21 was produced in the same manner as in Example 1, except that the sealing ability of the paper container with lid material 1, the openability of the paper container with lid material 1, and the peelability of the molded film 40 from the paper container 20 were confirmed.

[0103] Comparative Example 1 As shown in FIG. 18, a blank piece 30 was produced in which the bottom panel 31 had a generally rectangular shape in a plan view.

[0104] Next, using a paper container 20A and a paper container 10A made from this blank 30, a paper container 1A with a lid having a seal portion formed on a flange piece 25 was made as shown in FIG.

[0105] Next, in the same manner as in Example 1, the sealing property of the paper container with lid 1, the openability of the paper container with lid 1A, and the peelability of the formed film 40 from the paper container 20A were confirmed.

[0106] Comparative Example 2 As shown in Figure 23, a blank material 30C was produced in which the outer edge of the second flange piece panel 35b includes a portion extending along the X direction and a portion extending along the Y direction, and the shape of the outer edge of the second flange piece panel 35b is equal to the shape of the outer edge of the corner (corner C (see Figure 24)) formed by the other flange piece panels 35 when the blank material 30C is assembled.

[0107] Next, a paper container 20C and a paper container 10C made from this blank piece 30C were used to make a paper container 1C with a lid, in which a seal portion was formed on a flange piece 25, as shown in Fig. 24. In the paper container 20C and the paper container 10C made from the blank piece 30C, a corner portion C was not formed by the second flange piece 25b, the first flange piece 25a, and the third flange piece 25c.

[0108] Next, in the same manner as in Example 1, the sealing property of the paper container with lid 1, the openability of the paper container with lid 1C, and the peelability of the formed film 40 from the paper container 20C were confirmed.

[0109] The above results are shown in Table 1.

[0110] [Table 1]

[0111] In the "Sealing property" column of Table 1, "○" means that the lid material was completely sealed to the molded film, and therefore no leakage of the test liquid occurred. "×" means that leakage of the test liquid occurred.

[0112] In the "opening property" column of Table 1, "◯" means that the lid material was easy to peel off from the formed film, and "×" means that the lid material was difficult to peel off from the formed film.

[0113] In the "Removability" column of Table 1, "○" means that the formed film was easy to grip and peel off from the paper container, and "×" means that it was difficult to peel off the formed film from the paper container.

[0114] As a result, as shown in Table 1, leakage of the test liquid occurred in the paper containers with lids 1A and 1C according to Comparative Example 1 and Comparative Example 2. Specifically, because gaps occurred between the flange pieces, the seal portion formed on the flange pieces was not completely formed over the entire circumference. Therefore, the test liquid leaked due to the gaps that occurred between the flange pieces.

[0115] In contrast, in the paper containers 1 with lids according to Examples 1 to 10, the lids were securely sealed to the formed film all around, so no leakage of the test liquid occurred. Therefore, it was found that the paper containers 1 with lids according to the present embodiment can improve the sealing performance.

[0116] Also, as shown in Table 1, in the paper containers with lids 1A and 1C according to Comparative Examples 1 and 2, the lids were difficult to peel off from the formed film. Specifically, in the paper containers with lids 1A and 1C according to Comparative Examples 1 and 2, the seal portion was formed on the flange piece, so the adhesive strength between the lids and the formed film was too high. This made it difficult for the lids to peel off from the formed film when peeling the lids off from the formed film.

[0117] In contrast, in the paper containers 1 with lid material according to Examples 1 to 10, the lid material was easily peeled off from the formed film. Specifically, in the paper containers 1 with lid material according to Examples 1 to 10, the seal portion was not formed on the flange piece, so that it was possible to prevent the adhesive strength between the lid material and the formed film from becoming too large. As a result, when peeling the lid material from the formed film, the lid material was easily peeled off from the formed film. Therefore, it was found that the paper containers 1 with lid material according to this embodiment can improve the ease of opening.

[0118] Also, as shown in Table 1, in paper containers 10A and 10C according to Comparative Examples 1 and 2, it was difficult to peel the molded film from the paper container. Specifically, in paper containers 10A and 10C according to Comparative Examples 1 and 2, the seal portion was formed on the flange piece, so the molded film and the paper container were sealed again when the seal portion was formed. For this reason, the adhesive strength between the molded film and the paper container was too large, making it difficult to peel the molded film from the paper container.

[0119] In contrast, in the paper containers 10 according to Examples 1 to 10, the molded film was easy to grasp and peeled off from the paper container. Specifically, in the paper containers 10 according to Examples 1 to 10, the seal portion was not formed on the flange piece, so the molded film and the paper container were not resealed when the seal portion was formed. This prevented the adhesive strength between the molded film and the paper container from becoming too large. This allowed the molded film to be easily peeled off from the paper container when peeling it off from the paper container. Therefore, it was found that the paper container 10 according to this embodiment could improve the peelability of the molded film 40 from the paper container 20.

[0120] The present disclosure is not limited to the above-mentioned embodiment and each modification, and the components can be modified and embodied in the implementation stage without departing from the gist of the present disclosure. In addition, various inventions can be formed by appropriate combinations of multiple components disclosed in the above-mentioned embodiment and each modification. Some components may be deleted from all the components shown in the embodiment and each modification. [Explanation of symbols]

[0121] 1 Paper container with lid 10 Paper containers 20 Paper containers 21 Bottom 22 First broken line 23 Side 24 Second broken line 25 Flange piece 25a First flange piece 25b Second flange piece 25c 3rd flange piece 30 Blank material 31 Bottom Panel 32 First broken line 33 Side Panel 34 Second broken line 35 Flange Single Panel 35a First flange panel 35b Second flange panel 35c 3rd flange panel 36 Gap 40 Forming film 50 Lid material C Corner C1 Corner C2 corner H seal part NH1 First unsealed part NH2 No. 2 unsealed part

Claims

1. A paper container having a paper container and a formed film laminated on a surface of the paper container; A lid material that seals the paper container, The paper container is The bottom and A plurality of side portions connected to the bottom portion via first fold lines; a plurality of flange pieces connected to each side portion via a second folding line, The side portions are adjacent to each other and are not continuous with each other, The lid is sealed to the molded film by a seal portion formed around the entire periphery, A paper container with a lid, wherein the sealing portion is formed at a position that does not overlap the flange piece when viewed in a plan view.

2. 2. The paper container with lid according to claim 1, wherein a gripping portion is formed outside the sealed portion where the lid and the formed film are not sealed.

3. The plurality of flange pieces include a first flange piece, a second flange piece, and a third flange piece adjacent to each other, the second fold line adjacent to the second flange piece is shorter than the second fold line adjacent to the first flange piece and the second fold line adjacent to the third flange piece; The paper container with lid according to claim 2 , wherein the gripping portion is formed on the outside of a portion of the sealing portion that surrounds the second flange piece.

4. The paper container with lid according to claim 3 , wherein a width of the second flange piece is greater than a width of the first flange piece and a width of the third flange piece.

5. The paper container with lid according to claim 1 , wherein an unsealed portion is formed between an outer edge of the sealed portion and an outer edge of the lid.

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