Paper containers with lids, blank materials, and paper containers

Abstract

To provide a paper container with a lid material capable of improving an opening property, and to provide a blank material and a paper container.SOLUTION: A paper container 1 with a lid material includes: a paper container 10 having a paper container 20 and a molded film 40; and a lid material 50. The lid material 50 is sealed at the molded film 40 by an inner seal part H1 and an outer seal part H2 formed across the whole circumference. The inner seal part H1 is formed on a flange piece 25 of the paper container 20. The outer seal part H2 is formed at the position which is not overlapped with the flange piece 25, in a plan view. On at least one flange piece 25, at least part of an outer edge of the inner seal part H1 protrudes outward. Out of the outer seal part H2, at least part of an outer edge of a portion surrounding at least one flange piece 25 protrudes outward.SELECTED DRAWING: Figure 3

Description

Technical Field

[0001] The present disclosure relates to a paper container with a lid material, a blank material, and a paper container.

Background Art

[0002] Conventionally, containers for take-out food and beverages (so-called take-out products) and for food and beverages delivered to homes have been known.

[0003] In recent years, for the purpose of solving the problem of ocean pollution and reducing environmental load, reduction of the amount of resin used in such containers has been demanded, and reduction of the amount of resin or change of the material used for the containers has been promoted. As such a container, a paper container having a flange piece and a paper container provided with a formed film laminated on the inner wall of the paper container are known (for example, Patent Document 1). In such a paper container, after food is filled, the paper container is covered with a lid material.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] However, when opening such a paper container with a lid material, for example, the flange piece is cut off along a perforated cut line formed in the flange piece. In this case, it may be difficult to cut off the flange piece. For this reason, a paper container with a lid material having improved开封性 is desired.

[0006] The present disclosure has been made in consideration of such points, and an object thereof is to provide a paper container with a lid material, a blank material, and a paper container capable of improving开封性.

Means for Solving the Problems

[0007] A paper container with a lid according to one embodiment comprises a paper container having a paper container and a molded film laminated on the surface of the paper container, and a lid for sealing the paper container, wherein the paper container has a bottom, a plurality of sides connected to the bottom via a first fold line, and a plurality of flange pieces connected to each side via a second fold line, the sides being adjacent to each other but not continuous with each other, the lid being sealed to the molded film by an inner seal portion formed around the entire circumference and an outer seal portion surrounding the inner seal portion, the inner seal portion being formed on the flange pieces, the outer seal portion being formed in a position that does not overlap the flange pieces in a plan view, an unsealed portion being formed between the inner seal portion and the outer seal portion, at least a portion of the outer edge of the inner seal portion on at least one flange piece being convex outwards, and at least a portion of the outer edge of the portion of the outer seal portion surrounding at least one flange piece being convex outwards.

[0008] In a paper container with a lid according to one embodiment, the plurality of flange pieces may 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 may be shorter than the second fold line adjacent to the first flange piece and the second fold line adjacent to the third flange piece, at least a portion of the outer edge of the inner seal portion on the second flange piece may be convex outwards, and at least a portion of the outer edge of the portion of the outer seal portion surrounding the second flange piece may be convex outwards.

[0009] In a paper container with a lid according to one embodiment, the width of the second flange piece may be wider than the width of the first flange piece and the width of the third flange piece.

[0010] In a paper container with a lid according to one embodiment, the outer edge of the inner sealing portion on the second flange piece may extend along the outer edge of the second flange piece.

[0011] A blank material according to one embodiment comprises a bottom panel, a plurality of side panels connected to the bottom panel via a first fold line, and a plurality of flange piece panels connected to each side panel via a second fold line, wherein gaps are formed between the side panels, and the plurality of flange piece panels include at least a first flange piece panel, a second flange piece panel, and a third flange piece panel facing each other via the gaps, the second fold line adjacent to the second flange piece panel is shorter than the second fold line adjacent to the first flange piece panel and the second fold line adjacent to the third flange piece panel, at least a portion of the outer edge of the second flange piece panel is convex outward, and the shape of the outer edge of the second flange piece panel is different from the shape of the outer edge of the corner formed by the other flange piece panels when the blank material is assembled.

[0012] In a blank material according to one embodiment, the width of the second flange panel may be wider than the width of the first flange panel and the width of the third flange panel.

[0013] A paper container according to one embodiment is a paper container comprising a paper container made by assembling the blank material according to the present disclosure, and a molded film laminated on the surface of the paper container.

[0014] A paper container according to one embodiment comprises a paper container and a molded film laminated on the surface of the paper container, wherein the paper container has a bottom, a plurality of sides connected to the bottom via a first fold line, and a plurality of flange pieces connected to each side via a second fold line, the sides are adjacent to each other but not continuous, the plurality of flange pieces include at least 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, at least a portion of the outer edge of the second flange piece is convex outward, and the shape of the outer edge of the second flange piece is different from the shape of the outer edge of the corner formed by the other flange pieces.

[0015] In a paper container according to one embodiment, the width of the second flange piece may be wider than the width of the first flange piece and the width of the third flange piece. [Effects of the Invention]

[0016] According to this disclosure, the ease of opening paper containers with lids can be improved. [Brief explanation of the drawing]

[0017] [Figure 1] Figure 1 is a vertical cross-sectional view showing a paper container with a lid according to this embodiment. [Figure 2] Figure 2 is a perspective view showing a paper container with a lid according to this embodiment. [Figure 3] Figure 3 is a plan view showing a paper container with a lid according to this embodiment. [Figure 4] Figure 4 is a perspective view showing a paper container according to this embodiment. [Figure 5] Figure 5 is a plan view showing a paper container according to this embodiment. [Figure 6] Figure 6 is a plan view showing a blank material according to this embodiment. [Figure 7]FIG. 7 is a cross-sectional view showing a method for manufacturing a paper container according to the present embodiment. [Figure 8] FIG. 8 is a cross-sectional view showing a method for manufacturing a paper container according to the present embodiment. [Figure 9] FIG. 9 is a cross-sectional view showing a method for manufacturing a paper container according to the present embodiment. [Figure 10] FIG. 10 is a plan view showing a first modification example of a paper container with a lid according to the present embodiment. [Figure 11] FIG. 11 is a plan view showing a first modification example of a blank material according to the present embodiment. [Figure 12] FIG. 12 is a plan view showing a second modification example of a paper container with a lid according to the present embodiment. [Figure 13] FIG. 13 is a plan view showing a second modification example of a blank material according to the present embodiment. [Figure 14] FIG. 14 is a plan view showing a third modification example of a paper container with a lid according to the present embodiment. [Figure 15] FIG. 15 is a plan view showing a third modification example of a blank material according to the present embodiment. [Figure 16] FIG. 16 is a plan view showing a fourth modification example of a paper container with a lid according to the present embodiment. [Figure 17] FIG. 17 is a plan view showing a fourth modification example of a blank material according to the present embodiment. [Figure 18] FIG. 18 is a plan view showing a blank material for manufacturing a paper container with a lid of Comparative Example 1. [Figure 19] FIG. 19 is a plan view showing a paper container with a lid of Comparative Example 1. [Figure 20] FIG. 20 is a plan view showing a blank material for manufacturing a paper container with a lid of Comparative Example 2. [Figure 21] FIG. 21 is a plan view showing a paper container with a lid of Comparative Example 2. [Figure 22] FIG. 22 is a plan view showing a blank material for manufacturing a paper container with a lid of Comparative Example 3. [Figure 23]Figure 23 is a plan view showing a paper container with a lid according to Comparative Example 3. [Figure 24] Figure 24 is a plan view showing a blank material for manufacturing a paper container with a lid according to Comparative Example 4. [Figure 25] Figure 25 is a plan view showing the paper container with a lid of Comparative Example 4. [Figure 26] Figure 26 is a plan view showing the paper container with a lid of Comparative Example 5. [Modes for carrying out the invention]

[0018] This embodiment will be described below with reference to the drawings. Figures 1 to 9 show this embodiment. The following figures are schematic representations. Therefore, the size and shape of each part are exaggerated as appropriate to facilitate understanding. Furthermore, it can be modified as appropriate without departing from the technical concept. In the following figures, the same parts are denoted by the same reference numerals, and some detailed explanations may be omitted. In addition, the numerical values ​​such as dimensions and material names of each component described in this specification are examples of embodiments and are not limited to them; they can be selected and used as appropriate. In this specification, terms that specify shapes and geometric conditions, such as parallel, orthogonal, and perpendicular, will be interpreted to include not only their strict meaning but also substantially the same state.

[0019] In the following embodiments, "X direction" refers to the direction parallel to the longitudinal direction of the paper container with lid. "Y direction" refers to the direction perpendicular to the X direction and parallel to the width direction of the paper container with lid. "Z direction" refers to the direction perpendicular to both the X and Y directions and parallel to the height direction of the paper container with lid. In this specification, "top" and "bottom" refer to the upper (positive Z direction) and lower (positive Z direction) sides, respectively, when the paper container is in an upright position (Figure 1). In this specification, "outside" refers to the side away from the center of the bottom or the center of the bottom panel in a plan view. In this specification, "surface" refers to the side facing the contents, or the side facing upwards (positive Z direction side) when the paper container is in an upright position. In this specification, "back side" refers to the side opposite the surface.

[0020] Paper container with lid As shown in Figures 1 to 3, the paper container 1 with a lid according to this embodiment comprises a paper container 10 and a lid 50 that seals the paper container 10. Here, we will first describe the paper container 10.

[0021] paper container As shown in Figures 1 to 3, the paper container 10 comprises a paper container 20 and a molded film 40 laminated on the surface of the paper container 20. The paper container 20 is a container manufactured by assembling a blank material 30, which will be described later.

[0022] (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.

[0023] The base portion 21 has a roughly pentagonal shape in plan view. However, the base portion 21 may also have a polygonal shape, such as an octagon, in plan view.

[0024] The first fold line 22 connecting the bottom portion 21 and the side portion 23 may be formed in the shape of a perforation or a half-cut line. This makes it easier to fold the side portion 23 relative to the bottom portion 21. If the first fold line 22 is formed in the shape of a perforation, the molded film 40 is pressed against the paper container 20 near the first fold line 22 by sucking air from the suction hole 61 of the cavity side mold 60, which will be described later. This improves the adhesion between the molded film 40 and the paper container 20.

[0025] Each side portion 23 extends upward from the base portion 21. In this embodiment, the multiple side portions 23 include adjacent first side portions 23a to fifth side portions 23e, and the side portions 23 as a whole are formed in the shape of an inverted frustum pentagon. However, the embodiment is not limited to this, and the side portions 23 as a whole may be formed in the shape of a frustum of a polygon, such as an inverted frustum octagon.

[0026] The multiple side portions 23 are adjacent to each other but not continuous. That is, each side portion 23 is adjacent to each other without overlapping. A small gap is formed between each side portion 23 for air to pass through, and the molded film 40 is pressed against the paper container 20 by drawing air in through the suction holes 61 of the cavity side mold 60, which will be described later.

[0027] The second fold line 24 connecting the side portion 23 and the flange piece 25 may be formed in a perforated manner, similar to the first fold line 22, or it may be a half-cut line. This makes it easier to bend the flange piece 25 relative to the side portion 23. If the second fold line 24 is formed in a perforated manner, the molded film 40 is pressed against the paper container 20 near the second fold line 24 by sucking air from the suction hole 61 of the cavity side mold 60, which will be described later. This improves the adhesion between the molded film 40 and the paper container 20.

[0028] Each flange piece 25 protrudes horizontally laterally from the upper end of the side portion 23. The flange pieces 25 as a whole are formed in an annular shape. Furthermore, when the flange pieces 25 are adjacent to each other, corner portions C are formed by the flange portions 25. In the illustrated example, five corner portions C are formed by the flange portions 25.

[0029] In this embodiment, the multiple flange pieces 25 include adjacent first flange pieces 25a to fifth flange pieces 25e. Of these, at least a portion of the outer edge of the second flange piece 25b is convex outward, 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 slopes 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 in a V-shape overall. On the other hand, the outer edges of the first flange piece 25a and the fourth flange piece 25d each extend along the longitudinal direction (X direction) of the paper container 20. Also, the outer edges of the third flange piece 25c and the fifth flange piece 25e each extend along the width direction (Y direction) of the paper container 20.

[0030] The second bent line 24 adjacent to the second flange piece 25b is shorter than the second bent line 24 adjacent to the first flange piece 25a and the second bent line 24 adjacent to the third flange piece 25c. In this case, the second bent line 24 adjacent to the first flange piece 25a may be shorter than the second bent line 24 adjacent to the fourth flange piece 25d, and longer than the second bent line adjacent to the third flange piece 25c and the second bent line 24 adjacent to the fifth flange piece 25e. Furthermore, the second bent line 24 adjacent to the third flange piece 25c may be shorter than the second bent line 24 adjacent to the fourth flange piece 25d and the second bent line 24 adjacent to the fifth flange piece 25e. In addition, the second bent line 24 adjacent to the fourth flange piece 25d may be longer than the second bent line 24 adjacent to the fifth flange piece 25e. In other words, the length of the second bent line 24 may decrease in the following order: the second bent line 24 adjacent to the fourth flange piece 25d, the second bent line 24 adjacent to the first flange piece 25a, the second bent line 24 adjacent to the fifth flange piece 25e, the second bent line 24 adjacent to the third flange piece 25c, and the second bent line 24 adjacent to the second flange piece 25b.

[0031] Furthermore, as shown in Figure 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 flange piece in question along the direction perpendicular to the second broken line 24 adjacent to the flange piece in question. For example, the width W1 of the first flange piece 25a refers to the length of the first flange piece 25a along the direction perpendicular to the second broken line 24 adjacent to the first flange piece 25a (Y direction).

[0032] The multiple flange pieces 25 are adjacent to each other but not continuous. That is, each flange piece 25 is adjacent to each other without overlapping. This improves the adhesion between the flange pieces 25 and the molded film 40 around the entire circumference of the paper container 20. Also, because each flange piece 25 is adjacent to each other without overlapping, it is possible to suppress the occurrence of pinholes or other defects in the molded film 40 when it is bonded to the paper container 20. Furthermore, because each flange piece 25 is adjacent to each other without overlapping, it is possible to improve the adhesion between the molded film 40 and the lid material 50 when sealing the area of ​​the molded film 40 of the paper container 10 corresponding to the flange pieces 25. This suppresses the occurrence of sealing defects in the lid material 50.

[0033] (Blank material) Next, the blank material 30 for manufacturing the paper container 20 will be described. As shown in Figure 6, the blank material 30 comprises 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 panel 35 connected to each of the side panels 33 via a second fold line 34. Gaps 36 are formed between the side panels 33.

[0034] The bottom panel 31, first fold line 32, side panel 33, second fold line 34, and flange panel 35 of the blank material 30 correspond to the bottom 21, first fold line 22, side 23, second fold line 24, and flange panel 25 of the paper container 20, respectively. Therefore, the multiple side panels 33 include adjacent first side panels 33a to fifth side panels 33e. These first side panels 33a to fifth side panels 33e are panels that correspond to the first side 23a to fifth side 23e of the paper container 20, respectively.

[0035] The first to fifth side panels 33a to 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 side of the second side panel 33b extends along the Y direction. Also in the first side panel 33a, the side edge 33f on the opposite side of the second side panel 33b extends in a direction away from the side edge 33f on the second side panel 33b as you move from the first fold line 32 side towards the second fold line 34 side. In the third side panel 33c, the side edge 33f on the side of the second side panel 33b extends along the X direction. Furthermore, in the third side panel 33c, the side edge 33f opposite to the second side panel 33b extends in a direction away from the side edge 33f on the second side panel 33b as you move from the first fold line 32 side towards the second fold line 34 side. On the other hand, 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 you move from the first fold line 32 side towards the second fold line 34 side. With this configuration, in the paper container 10 described above, the sides 23 do not overlap with each other but are adjacent to each other (see Figures 2 to 4).

[0036] As described above, the flange panel 35 of the blank material 30 corresponds to the flange piece 25 of the paper container 20. The multiple flange panel 35s include first flange panel 35a to fifth flange panel 35e that face each other via gaps 36. These first flange panel 35a to fifth flange panel 35e are panels that correspond to the first flange piece 25a to fifth flange piece 25e of the paper container 20, respectively. For this reason, at least a portion of the outer edge of the second flange panel 35b is convex outwards, and the shape of the outer edge of the second flange panel 35b is different from the shape of the outer edge of the corner (corner C (see Figures 4 and 5)) formed by the other flange panel 35s when the blank material 30 is assembled. In addition, the second fold line 34 adjacent to the second flange panel 35b is shorter than the second fold line 34 adjacent to the first flange panel 35a and the second fold line 34 adjacent to the third flange panel 35c. Furthermore, as shown in Figure 6, the width W5 of the second flange panel 35b may be wider than the width W4 of the first flange panel 35a and the width W6 of the third flange panel 35c. Note that the width of a flange panel refers to the length of the flange panel in question along a direction perpendicular to the second rifling line 34 adjacent to the flange panel in question. For example, the width W4 of the first flange panel 35a refers to the length of the first flange panel 35a along a direction perpendicular to the second rifling line 34 adjacent to the first flange panel 35a (Y direction).

[0037] The bottom panel 31, side panels 33, and flange panel 35 of such a blank material 30 are formed integrally. The blank material 30 can be manufactured by punching or other processes applied to the paper material that constitutes the blank material 30.

[0038] For example, the paper material that makes up the blank material 30 is a paper with a basis weight of 150 g / m². 2 More than 800g / m 2 Various types of paperboard, coated paper, card stock, ivory paper, milk carton paper, cup paper, coated cardboard, and other processed papers of the following quality can be used.

[0039] (Molded film) Next, the molded film 40 will be described with reference to Figures 1 to 3. This molded film 40 serves to protect the paper container 20. The molded film 40 also 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. The molded film 40 is adhered to the paper container 20, for example, by heat sealing (heat welding). In this embodiment, the planar shape of the molded film 40 is larger than the planar shape of the paper container 20. Therefore, in a plan view, the molded film 40 spreads out around the flange piece 25 of the paper container 20.

[0040] Such a molded film 40 can be any film made of a thermoplastic resin having water resistance, sealing properties, and heat-sealing properties. As the molded film 40, for example, films of 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, ethylene-vinyl acetate copolymer saponified, polycarbonate, polybutene, polyvinyl alcohol, and other various thermoplastic resins can be used alone or laminated. In particular, if it is desired to impart gas barrier properties to the paper container 10, for example, a laminate in which a gas barrier material such as ethylene-vinyl alcohol copolymer (EVOH) is laminated as an intermediate layer, specifically a laminate with a layer configuration such as PE / EVOH / PE, PP / EVOH / PE, or A(amorphous)·PET / EVOH / PE can be used. Note that " / " means the boundary between adjacent layers.

[0041] The molded film 40 may be made from a laminate having, for example, the following layer configuration. (Back side) Polyethylene (40μm) / Ionomer (40μm) / Polyethylene (40μm) (Front side) (Back side) Polypropylene (30μm) / Adhesive layer (10μm) / Ionomer (40μm) / Adhesive layer (10μm) / Polypropylene (30μm) (Front side) (Back side) Polyethylene (20 μm) / Ionomer (30 μm) / Adhesive layer (10 μm) / Ethylene-vinyl alcohol copolymer (10 μm) / Adhesive layer (10 μm) / Ionomer (15 μm) / Ethylene-vinyl acetate copolymer (20 μm) (Front side)

[0042] Each of the above layers is formed according to conventional methods, using dry lamination, extrusion lamination, extrusion coating, or other coating methods.

[0043] Lid material Next, the lid material 50 will be described with reference to Figure 3. The lid material 50 is sealed to the molded film 40 by an inner seal portion H1 formed around its entire circumference and an outer seal portion H2 surrounding the inner seal portion H1. Of these, the inner seal portion H1 is formed on the flange piece 25. On the other hand, the outer seal portion H2 is formed in a position that does not overlap the flange piece 25 in a plan view. In other words, the outer seal portion H2 is formed around the flange piece 25. A first unsealed portion (unsealed part) NH1 is formed between the inner seal portion H1 and the outer seal portion H2, and a second unsealed portion NH2 is formed around the outer seal portion H2. Here, the first unsealed portion NH1 and the second unsealed portion NH2 are the parts of the lid material 50 that are not sealed to the molded film 40. In the following description, the part of the lid material 50 that is not sealed to the molded film 40 will also be simply referred to as "NH".

[0044] The aforementioned internal seal portion H1 may be formed over the entire area of ​​the flange piece 25, or it may be formed over only a portion of the flange piece 25 in the width direction. For example, the internal seal portion H1 does not need to be formed on the flange piece 25 near the outer edge of the flange piece 25. In other words, in a plan view, the first unsealed portion NH1 may be formed so as to straddle the outer edge of the flange piece 25.

[0045] Here, on at least one flange piece 25, at least a portion of the outer edge of the inner seal portion H1 is convex outward. In this embodiment, on the second flange piece 25b, the entire outer edge of the inner seal portion H1 is convex outward. Although not shown in the figures, on flange pieces 25 other than the second flange piece 25b, at least a portion of the outer edge of the inner seal portion H1 may be convex outward. That is, on at least one of the first flange piece 25a, third flange piece 25c, fourth flange piece 25d, and fifth flange piece 25e, at least a portion of the outer edge of the inner seal portion H1 may be convex outward.

[0046] In this embodiment, the outer edge of the inner seal portion H1 extends along the outer edge of the second flange piece 25b. Therefore, on the second flange piece 25b, the outer edge of the inner seal portion H1 extends along the direction that inclins in both the longitudinal direction (X direction) and the width direction (Y direction) of the paper container 20. In this case, the outer edge of the inner seal portion H1 extends along the direction in which the second flange piece 25b inclins toward the adjacent second fold line 24. The outer edge of the inner seal portion H1 is formed in a V-shape overall.

[0047] On the other hand, on the first flange piece 25a, the third flange piece 25c, the fourth flange piece 25d, and the fifth flange piece 25e, the outer edge of the inner seal portion H1 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, on the first flange piece 25a and the fourth flange piece 25d, the outer edge of the inner seal portion H1 extends along the longitudinal direction (X direction) of the first flange piece 25a and the fourth flange piece 25d, respectively. Also, on the third flange piece 25c and the fifth flange piece 25e, the outer edge of the inner seal portion H1 extends along the longitudinal direction (Y direction) of the third flange piece 25c and the fifth flange piece 25e, respectively.

[0048] Next, the outer seal portion H2 will be described. As mentioned above, the outer seal portion H2 is formed in a position that does not overlap with the flange piece 25 in a plan view. For this reason, the outer seal portion H2 surrounds the flange piece 25 around its entire circumference.

[0049] Here, at least a portion of the outer edge of the outer seal portion H2 surrounding at least one flange piece 25 is convex outward. In this embodiment, the entire outer edge of the outer seal portion H2 surrounding the second flange piece 25b is convex outward. Although not shown in the figures, at least a portion of the outer edge of the outer seal portion H2 surrounding the flange pieces 25 other than the second flange piece 25b may also be convex outward. That is, at least a portion of the outer edge of the outer seal portion H2 surrounding at least one of the first flange piece 25a, third flange piece 25c, fourth flange piece 25d, and fifth flange piece 25e may also be convex outward.

[0050] In this embodiment, the outer edge of the portion of the outer seal H2 surrounding the second flange piece 25b extends along a direction that slopes in both the longitudinal direction (X direction) and the width direction (Y direction) of the paper container 20. In this case, the outer edge of the portion of the outer seal H2 surrounding the second flange piece 25b extends along a direction in which the second flange piece 25b slopes toward the adjacent second fold line 24. Furthermore, the outer edge of this portion of the outer seal H2 includes a V-shaped portion.

[0051] On the other hand, the outer edges of the portions of the outer seal H2 surrounding the first flange piece 25a, the third flange piece 25c, the fourth flange piece 25d, and the fifth flange piece 25e extend 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 edges of the portions of the outer seal H2 surrounding the first flange piece 25a or the fourth flange piece 25d extend along the longitudinal direction (X direction) of the first flange piece 25a and the fourth flange piece 25d, respectively. Also, the outer edges of the portions of the outer seal H2 surrounding the third flange piece 25c or the fifth flange piece 25e extend along the longitudinal direction (Y direction) of the third flange piece 25c and the fifth flange piece 25e, respectively.

[0052] Such a lid material 50 can be a laminate with a layered structure such as PET / sealant layer, PP / sealant layer, PET / PP / sealant layer, PET / PE / sealant layer, or K-coated stretched nylon (KON) / PE / sealant layer. Furthermore, the laminate constituting the lid material 50 may be a laminate in which a gas barrier material such as ethylene-vinyl alcohol copolymer (EVOH) is laminated as an intermediate layer. For example, the lid material 50 can be a laminate with a layered structure such as PET / PE / ethylene-vinyl alcohol copolymer (EVOH) / PE / sealant layer. Also, aluminum foil or vapor-deposited film (aluminum vapor deposition or transparent vapor deposition) may be used as the barrier layer. Furthermore, it is preferable to use a resin material that exhibits so-called easy-peel properties for the sealant.

[0053] The lid material 50 may be made from a laminate having the following layer configuration, for example. (Opposite side of contents) Transparent vapor-deposited polyethylene terephthalate film (12μm) / nylon film (15μm) / polyethylene film (40μm) (Contents side)

[0054] Each of the above layers is formed according to conventional methods, using dry lamination, extrusion lamination, extrusion coating, or other coating methods.

[0055] In a paper container 1 with a lid, the contents are first filled into the paper container 10. Next, the lid 50 is sealed to the molded film 40 of the paper container 10 by the inner seal portion H1 and the outer seal portion H2. This results in a paper container 1 with a lid filled with contents. The paper container 1 with a lid may be used as a container for chilled or frozen foods, or as a container for takeout. The contents may include prepared foods, meat, dairy products, and other food items.

[0056] Next, the operation of this embodiment, which has the above configuration, will be described. Here, the manufacturing method of the paper container 10 and the manufacturing method of the paper container 1 with a lid will be explained with reference to Figures 7 to 9.

[0057] Paper container manufacturing method First, a blank material 30 is prepared. In this case, paper material is prepared, and the blank material 30 is obtained by punching out this paper material using a die-cutting machine or the like.

[0058] Next, as shown in Figure 7, the blank material 30 is mounted onto the cavity-side mold 60. The cavity-side mold 60 has suction holes 61, and the blank material 30 is mounted onto the cavity-side mold 60 by drawing air through the suction holes 61. At this time, the side panel 33 of the blank material 30 is folded relative to the bottom panel 31 along the first fold line 32. Similarly, the flange panel 35 of the blank material 30 is folded relative to the side panel 33 along the second fold line 34. This results in a paper container 20 mounted on the cavity-side mold 60.

[0059] Next, a molded film 40 is laminated onto the surface of the paper container 20. First, as shown in Figure 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. After the film 40a has been sufficiently heated by the hot plate 62, air is drawn in through the suction hole 61. As a result, as shown in Figure 9, the film 40a is drawn onto the paper container 20. This causes the film 40a to adhere tightly to the paper container 20, and a molded film 40 laminated onto the paper container 20 is obtained, as shown in Figure 9. In this way, a paper container 10 is obtained.

[0060] Next, we will explain how to manufacture the paper container 1 with a lid.

[0061] First, while manufacturing the paper container 10, a laminated material to serve as the lid 50 is prepared. This laminated material is manufactured using a dry lamination method or similar.

[0062] Next, the contents are filled into the paper container 10, and the paper container 10 is sealed with the laminate. First, the contents (not shown) are filled into the paper container 10. Then, the laminate is placed on the molded film 40 at a position corresponding to the flange piece 25.

[0063] Next, the laminate is sealed to the molded film 40 using a sealing hot plate (not shown). The laminate is sealed to the molded film 40 by an inner seal portion H1 and an outer seal portion H2 formed around its entire circumference. At this time, the air inside the paper container 10 may be replaced with, for example, nitrogen gas. When forming the inner seal portion H1, the molded film 40 and the laminate are sandwiched together with the flange piece 25 using a sealing hot plate (not shown). This forms the inner seal portion H1 on the flange piece 25. On the other hand, when forming the outer seal portion H2, only the molded film 40 and the laminate are sandwiched around the flange piece 25 using a sealing hot plate (not shown). This ensures that the laminate is securely sealed to the molded film 40 around its entire circumference. After that, the molded film 40 and the laminate are cut into a predetermined shape using a cutting tool or the like.

[0064] In this way, a paper container with a lid 1 is obtained, which comprises a paper container 10 and a lid material 50 that seals the paper container 10.

[0065] As described above, according to this embodiment, the inner seal portion H1 is formed on the flange piece 25, and the outer seal portion H2 is formed in a position that does not overlap with the flange piece 25 in a plan view. This improves the airtightness of the paper container 1 with a lid. That is, by forming the outer seal portion H2 surrounding the inner seal portion H1 around the flange piece 25, the lid 50 can be reliably sealed to the molded film 40 around its entire circumference.

[0066] Furthermore, a first unsealed portion NH1 is formed between the inner seal portion H1 and the outer seal portion H2. This makes it easier to peel the lid material 50 from the molded film 40, even when the outer seal portion H2 is formed around the inner seal portion H1.

[0067] Furthermore, on the second flange piece 25b, at least a portion of the outer edge of the inner seal portion H1 is convex outward, and at least a portion of the outer edge of the portion of the outer seal portion H2 surrounding the second flange piece 25b is also convex outward. As a result, when peeling the lid material 50 from the molded film 40, portions that trigger peeling may be created in the inner seal portion H1 and the outer seal portion H2. Therefore, even when the lid material 50 is sealed to the molded film 40 by the inner seal portion H1 and the outer seal portion H2, the ease of opening the paper container 1 with the lid material can be improved.

[0068] 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 more prominent. As a result, consumers can easily determine where to open the paper container 1 with the lid.

[0069] Furthermore, according to this embodiment, the width W2 of the second flange piece 25b is wider than the width W1 of the first flange piece 25a and the width W3 of the third flange piece 25c. This makes it easier for consumers to hold down the second flange piece 25b when peeling the lid material 50 from the molded film 40. This improves the ease of opening the paper container 1 with the lid material. Also, when peeling the molded film 40 from the paper container 20, consumers can easily hold down the second flange piece 25b. This improves the ease of peeling the molded film 40 from the paper container 20.

[0070] Furthermore, according to this embodiment, the outer edge of the inner seal portion H1 extends along the outer edge of the second flange piece 25b. In this case, at least a portion of the outer edge of the second flange piece 25b is convex outward, and the shape of the outer edge of the second flange piece 25b may differ from the shape of the outer edge of the corner portion C formed by the other flange pieces 25. This makes it possible to easily form the inner seal portion H1 of the above shape using an existing sealing heat plate. In other words, the inner seal portion H1 of the above shape can be easily formed without manufacturing a new sealing heat plate. Therefore, the paper container 1 with a lid can be easily manufactured, and the productivity of the paper container 1 with a lid can be improved.

[0071] Variation Next, modifications of the paper container 1 with a lid and the blank material 30 according to this embodiment will be described with reference to Figures 10 to 17. In Figures 10 to 17, the same reference numerals are used for parts that are the same as those in the embodiments shown in Figures 1 to 9, and detailed descriptions are omitted.

[0072] (First variation) In the example shown in Figure 10, the outer edge of the inner seal portion H1 on the second flange piece 25b is curved so as to be convex outward. In this case, the outer edge of the inner seal portion H1 on the second flange piece 25b is formed in an arc shape.

[0073] Furthermore, in this modified example, as shown in Figures 10 and 11, the outer edge of the second flange piece 25b (second flange piece panel 35b) is curved so as to be convex outwards. In this case, the outer edge of the second flange piece 25b (second flange piece panel 35b) is formed in an arc shape.

[0074] In this modified example as well, when peeling the lid material 50 from the molded film 40, a point that triggers peeling may be generated in the inner seal portion H1 and the outer seal portion H2. Therefore, even when the lid material 50 is sealed to the molded film 40 by the inner seal portion H1 and the outer seal portion H2, the ease of opening the paper container 1 with the lid material can be improved.

[0075] (Second variation) In the example shown in Figure 12, on the second flange piece 25b, only a portion of the outer edge of the inner seal portion H1 is convex outwards. In this case, on the second flange piece 25b, only the outer edge of the central part of the inner seal portion H1 is convex outwards. The outer edge of the central part of the inner seal portion H1 is formed in an L-shape overall.

[0076] Furthermore, in this modified example, as shown in Figures 12 and 13, only a portion of the outer edge of the second flange piece 25b (second flange piece panel 35b) is convex outwards. In this case, only the outer edge of the central part of the second flange piece 25b (second flange piece panel 35b) is convex outwards. The outer edge of the central part of the second flange piece 25b (second flange piece panel 35b) is formed in an L-shape overall.

[0077] In this modified example as well, when peeling the lid material 50 from the molded film 40, a point that triggers peeling may be generated in the inner seal portion H1 and the outer seal portion H2. Therefore, even when the lid material 50 is sealed to the molded film 40 by the inner seal portion H1 and the outer seal portion H2, the ease of opening the paper container 1 with the lid material can be improved.

[0078] (Third variation) In the example shown in Figure 14, on the second flange piece 25b, only a portion of the outer edge of the inner seal portion H1 is convex outward. In this case, on the second flange piece 25b, only the outer edge of the central part of the inner seal portion H1 is convex outward. Furthermore, on the second flange piece 25b, the outer edge of the central part of the inner seal portion H1 is curved to be convex outward. The outer edge of the central part of the inner seal portion H1 is formed in an arc shape as a whole.

[0079] Furthermore, in this modified example, as shown in Figures 14 and 15, only a portion of the outer edge of the second flange piece 25b (second flange piece panel 35b) is convex outwards. In this case, only the outer edge of the central part of the second flange piece 25b (second flange piece panel 35b) is convex outwards. Also, on the second flange piece 25b, the outer edge of the central part of the inner seal portion H1 is curved to be convex outwards. And the outer edge of the central part of the second flange piece 25b (second flange piece panel 35b) is formed in an arc shape overall.

[0080] In this modified example as well, when peeling the lid material 50 from the molded film 40, a point that triggers peeling may be generated in the inner seal portion H1 and the outer seal portion H2. Therefore, even when the lid material 50 is sealed to the molded film 40 by the inner seal portion H1 and the outer seal portion H2, the ease of opening the paper container 1 with the lid material can be improved.

[0081] (Fourth variation) In the example shown in Figure 16, the outer edge of the inner seal portion H1 on the second flange piece 25b is curved so as to be convex outward. In this case, the outer edge of the inner seal portion H1 on the second flange piece 25b has a wave-like shape.

[0082] Furthermore, in this modified example, as shown in Figures 16 and 17, the outer edge of the second flange piece 25b (second flange piece panel 35b) is curved so as to be convex outwards. In this case, the outer edge of the second flange piece 25b (second flange piece panel 35b) has a wave-like shape.

[0083] In this modified example as well, when peeling the lid material 50 from the molded film 40, a point that triggers peeling may be generated in the inner seal portion H1 and the outer seal portion H2. Therefore, even when the lid material 50 is sealed to the molded film 40 by the inner seal portion H1 and the outer seal portion H2, the ease of opening the paper container 1 with the lid material can be improved. [Examples]

[0084] Next, we will describe specific examples of the above embodiments.

[0085] (Example 1) First, a blank material 30, as shown in Figure 6, was prepared. In this case, the material used for the blank material 30 had a basis weight of 350 g / m². 2 Coated paper was prepared. Then, the coated paper was punched out into a predetermined shape to create a blank material 30.

[0086] Furthermore, a film (thickness 120 μm) having the following layer structure was prepared as the molded film 40. PE(40μm) / Ionomer(40μm) / PE(40μm)

[0087] Next, the obtained blank material 30 was mounted onto the cavity-side mold 60 and assembled to produce a paper container 20. Then, a paper container 10 was produced by laminating a film onto the surface of the paper container 20.

[0088] Next, a film having the following layer structure was prepared as the lid material 50, and the paper container 10 was sealed with this film. PET (12 μm) / PE (50 μm) In this way, a paper container 1 with a lid, as shown in Figure 1, was manufactured.

[0089] Next, the ease of opening the paper container 1 with the lid was confirmed by peeling the lid material 50 from the molded film 40.

[0090] Subsequently, the peelability of the molded film 40 from the paper container 20 was confirmed by peeling the molded film 40 from the paper container 20.

[0091] (Example 2) Except for the fact that a blank material 30 shown in Figure 11 was prepared and a paper container 1 with a lid shown in Figure 10 was prepared, the procedure was the same as in Example 1, and the ease of opening the paper container 1 with a lid and the ease of peeling the molded film 40 from the paper container 20 were confirmed.

[0092] (Example 3) Except for the preparation of the blank material 30 shown in Figure 13 and the preparation of the paper container 1 with a lid shown in Figure 12, the procedure was the same as in Example 1, and the ease of opening the paper container 1 with a lid and the ease of peeling the molded film 40 from the paper container 20 were confirmed.

[0093] (Example 4) Except for the fact that a blank material 30 shown in Figure 15 was prepared and a paper container 1 with a lid shown in Figure 14 was prepared, the procedure was the same as in Example 1, and the ease of opening the paper container 1 with a lid and the ease of peeling the molded film 40 from the paper container 20 were confirmed.

[0094] (Example 5) Except for the preparation of the blank material 30 shown in Figure 17 and the preparation of the paper container 1 with a lid shown in Figure 16, the procedure was the same as in Example 1, and the ease of opening the paper container 1 with a lid and the ease of peeling the molded film 40 from the paper container 20 were confirmed.

[0095] (Comparative Example 1) As shown in Figure 18, a blank material 30A was fabricated in which the bottom panel 31 has a roughly rectangular shape when viewed from above.

[0096] Next, using the paper container 20A and paper container 10A made from this blank material 30A, a paper container 1A with a lid material without an outer seal portion was manufactured, as shown in Figure 19.

[0097] Next, in the same manner as in Example 1, the ease of opening the paper container 1A with a lid and the peelability of the molded film 40 from the paper container 20A were confirmed.

[0098] (Comparative Example 2) As shown in Figure 20, a blank material 30B was fabricated in which the bottom panel 31 has a roughly rectangular shape in plan view, and a tab 37 is provided on a part of the flange panel 35.

[0099] Next, using the paper container 20B and paper container 10B made from this blank material 30B, a paper container 1B with a lid material without an outer seal was manufactured, as shown in Figure 21.

[0100] Next, in the same manner as in Example 1, the ease of opening the paper container 1B with a lid and the peelability of the molded film 40 from the paper container 20B were confirmed.

[0101] (Comparative Example 3) As shown in Figure 22, the blank material 30C is such that the outer edge of the second flange 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 panel 35b is equal to the shape of the outer edge of the corner (corner C (see Figure 23)) formed by the other flange panels 35 when the blank material 30C is assembled.

[0102] Next, using the paper container 20C and paper container 10C made from the blank material 30C, a paper container 1C with a lid material without an outer seal portion was manufactured, as shown in Figure 23. In the paper container 20C and paper container 10C made from the blank material 30C, the second flange piece 25b, the first flange piece 25a, and the third flange piece 25c did not form a corner portion C.

[0103] Next, in the same manner as in Example 1, the ease of opening the paper container 1C with a lid and the peelability of the molded film 40 from the paper container 20C were confirmed.

[0104] (Comparative Example 4) As shown in Figure 24, a blank material 30D was fabricated in which the outer edge of the second flange panel 35b was not convex outwards. The outer edge of the second flange panel 35b of the blank material 30D extended in a straight line along the direction of inclination in both the X and Y directions.

[0105] Next, using the paper container 20D and paper container 10D made from this blank material 30D, a paper container 1D with a lid was manufactured, as shown in Figure 25, in which the outer edge of the inner seal portion H1 on the second flange piece 25b was not convex outward. The outer edge of the inner seal portion H1 of the paper container 1D with a lid extended in a straight line along the direction of inclination in both the X and Y directions on the second flange piece 25b.

[0106] Next, in the same manner as in Example 1, the ease of opening the paper container 1D with a lid and the peelability of the molded film 40 from the paper container 20D were confirmed.

[0107] (Comparative Example 5) Using the paper container 20D and paper container 10D made from the blank material 30D shown in Figure 24, a paper container 1E with a lid was fabricated as shown in Figure 26.

[0108] On the second flange piece 25b of the paper container 1E with a lid, the outer edge of the inner seal portion H1 was not convex outward, but extended in a straight line along directions that were inclined in both the X and Y directions.

[0109] Furthermore, in the paper container 1E with a lid, the outer edge of the portion of the outer sealing part H2 surrounding the second flange piece 25b was not convex outwards, but extended in a straight line along the direction that slopes in both the X and Y directions.

[0110] Next, in the same manner as in Example 1, the ease of opening the paper container 1E with a lid and the peelability of the molded film 40 from the paper container 20D were confirmed.

[0111] The results are shown in Table 1.

[0112] [Table 1]

[0113] In the "Openability" column of Table 1 above, "○" means that the lid was easy to grasp and easy to peel off the molded film. "△" means that the lid was easy to grasp but difficult to peel off the molded film. "×" means that the lid was difficult to grasp and difficult to peel off the molded film.

[0114] In the "Releaseability" column of Table 1 above, "○" means that the molded film was easy to grasp and easy to peel off the paper container. "×" means that the molded film was difficult to peel off the paper container.

[0115] As a result, as shown in Table 1, in the paper containers with lids 1A and 1C from Comparative Examples 1 and 3, the lids were difficult to grasp and difficult to peel off from the molded film. In contrast, in the paper containers with lids 1D and 1E from Comparative Examples 4 and 5, the lids were easy to grasp, but difficult to peel off from the molded film. Specifically, in the paper containers with lids 1D and 1E from Comparative Examples 4 and 5, the outer edge of the inner seal portion H1 on the second flange piece 25b was not convex outward, making it difficult to peel the lids off from the molded film.

[0116] In contrast, the paper container 1 with a lid according to Examples 1 to 5 made it easier to grasp the lid and peel it off the molded film. Specifically, in the paper container 1 with a lid according to Examples 1 to 5, it was easier to hold down the second flange piece when peeling the lid off the molded film, allowing the lid to be easily peeled off the molded film. Therefore, it was found that the paper container 1 with a lid according to this embodiment can improve ease of opening.

[0117] Furthermore, as shown in Table 1, in the paper containers 10A, 10B, 10C, and 10D of Comparative Examples 1 to 5, it was difficult to peel the molded film from the paper container. Specifically, in the paper containers 10A and 10C of Comparative Examples 1 and 3, it was difficult to grasp the molded film, making it difficult to peel the molded film from the paper container. Also, in the paper container 10B of Comparative Example 2, the paper container 20B became distorted when peeling the molded film from the paper container, making it difficult to peel the molded film from the paper container. In addition, in the paper container 10D of Comparative Examples 4 and 5, the outer edge of the second flange piece 25b (second flange piece panel 35b) was not convex outwards, making it difficult to peel the molded film from the paper container.

[0118] In contrast, in the paper containers 10 according to Examples 1 to 5, the molded film was easy to grasp and easy to peel off from the paper container. Specifically, in the paper containers 10 according to Examples 1 to 5, it was easier to hold down the second flange piece when peeling the molded film from the paper container, allowing the molded film to be easily peeled off from the paper container. Therefore, it was found that the paper containers 10 according to this embodiment can improve the peelability of the molded film 40 from the paper container 20.

[0119] This disclosure is not limited to the above embodiments and their respective modifications, and in the implementation stage, the components can be modified and embodied without departing from the gist of the invention. Furthermore, various inventions can be formed by appropriate combinations of the multiple components disclosed in the above embodiments and their respective modifications. Some components may be deleted from all the components shown in the embodiments and their respective modifications. [Explanation of symbols]

[0120] 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 pieces 25a First flange piece 25b Second flange piece 25c Third flange piece 30 blank materials 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 single panel 35c Third Flange Panel 36 gaps 40 Molded film 50 Lid material C Corner H1 Internal seal section H2 Outer seal section NH1 First Unsealed Section

Claims

1. A paper container having a paper container and a molded film laminated on the surface of the paper container, The paper container comprises a lid material for sealing the container, The aforementioned paper container is The bottom and, Multiple side portions connected to the bottom via a first broken line, Each side has a plurality of flange pieces connected via a second bent line, The aforementioned side portions are adjacent to each other but are not continuous. The lid material is sealed to the molded film by an inner sealing portion formed around its entire circumference and an outer sealing portion surrounding the inner sealing portion. The internal seal portion is formed on the flange piece, The outer sealing portion is formed in a position that does not overlap with the flange piece in a plan view. A paper container with a lid, wherein an unsealed portion is formed between the inner seal portion and the outer seal portion.

2. The plurality of flange pieces include a first flange piece, a second flange piece, and a third flange piece that are adjacent to each other. The second bend adjacent to the second flange piece is shorter than the second bend adjacent to the first flange piece and the second bend adjacent to the third flange piece. On the second flange piece, at least a portion of the outer edge of the inner seal portion is convex outward. The paper container with a lid according to claim 1, wherein at least a portion of the outer edge of the part of the outer sealing portion that surrounds the second flange piece is convex outward.

3. The paper container with a lid according to claim 2, 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.

4. The paper container with a lid according to claim 2 or 3, wherein the outer edge of the inner seal portion extends along the outer edge of the second flange piece on the second flange piece.

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