JP2024121609A - Paper containers, paper containers with lids and blanks - Google Patents

Abstract

The present invention provides a paper container, a paper container with a lid, and a blank material that are capable of suppressing the occurrence of pinholes.
[Solution] 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 has a bottom 21, a plurality of side portions 23 connected to the bottom portion 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. The side portions 23 are adjacent to each other without being continuous with each other. The second fold line 24 includes a plurality of first cut portions 24a that penetrate the paper container 20. The length L2 of each of the first cut portions 24a is 30 mm or less.
[Selected Figure] Figure 5B

Description

This disclosure relates to paper containers, paper containers with lids, and blanks.

Containers for holding food and drink to be taken home (so-called take-out products) or food and drink to be delivered to your home have been known for some time.

In recent years, in order to address the problem of marine pollution and reduce the environmental burden, there has been a demand to reduce 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. One such container known is a paper container that includes a paper container with a flange piece and a molded film laminated on the inner wall of the paper container (see, for example, Patent Document 1). In such a paper container, after the food is filled, the paper container is covered with a lid material.

Special Publication No. 2013-545675

However, when producing such paper containers, there is a possibility that pinholes may occur in the molded film when the molded film is bonded to the paper container.

This disclosure has been made in consideration of these points, and aims to provide a paper container, a blank material, and a paper container with a lid material that can suppress the occurrence of pinholes.

A first aspect of the present disclosure is a paper container comprising a paper container and a formed film laminated on the surface of the paper container, the paper container having a bottom, a plurality of side portions connected to the bottom via a first fold line, and a plurality of flange pieces connected to each side portion via a second fold line, the side portions being adjacent to each other without being continuous with each other, the second fold line including a plurality of first cut portions penetrating the paper container, and the length of each of the first cut portions being 30 mm or less.

In a second aspect of the present disclosure, in the paper container according to the first aspect described above, the first fold line may include a plurality of second cut portions that penetrate the paper container, and the length of each of the second cut portions may be 30 mm or less.

A third aspect of the present disclosure is a paper container comprising a paper container and a molded film laminated on a surface of the paper container, the paper container having a bottom, a plurality of side portions connected to the bottom via a first fold line, and a plurality of flange pieces connected to each side portion via a second fold line, the side portions being adjacent to each other without being continuous with each other, the second fold line including a plurality of first cut portions penetrating the paper container, each of the first cut portions having a length of 35 mm or less, and the basis weight of the paper constituting the paper container being 350 g/ ^m2 or more.

In a fourth aspect of the present disclosure, in the paper container according to the third aspect described above, the first fold line may include a plurality of second cut portions that penetrate the paper container, and each of the second cut portions may have a length of 35 mm or less.

A fifth aspect of the present disclosure is a paper container comprising a paper container and a formed film laminated on the surface of the paper container, the paper container having a bottom, a plurality of side portions connected to the bottom via a first fold line, and a plurality of flange pieces connected to each side portion via a second fold line, the side portions being adjacent to each other without being continuous with each other, the second fold line including first thin-walled portions formed at both ends and a plurality of first cut portions formed between the first thin-walled portions and penetrating the paper container, the length of the first thin-walled portions being 10 mm or more.

In a sixth aspect of the present disclosure, in the paper container according to the fifth aspect described above, the first fold line may include second thin-walled portions formed at both ends and a plurality of second cut portions formed between the second thin-walled portions and penetrating the paper container, and the length of the second thin-walled portions may be 10 mm or more.

The seventh aspect of the present disclosure is a paper container with a lid, comprising the paper container according to any one of the first to sixth aspects described above and a lid that seals the paper container.

The eighth aspect of the present disclosure is a blank material comprising 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 of the side panels via a second fold line, wherein gaps are formed between the side panels, the second fold line includes a plurality of first cut portions penetrating the blank material, and the length of each of the first cut portions is 30 mm or less.

In a ninth aspect of the present disclosure, in the blank material according to the eighth aspect described above, the first fold line may include a plurality of second cut portions penetrating the blank material, and each of the second cut portions may have a length of 30 mm or less.

A tenth aspect of the present disclosure is a blank material comprising 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 of the side panels via a second fold line, wherein gaps are formed between the side panels, the second fold line includes a plurality of first cut portions penetrating the blank material, each of the first cut portions having a length of 35 mm or less, and the basis weight of the paper constituting the blank material is 350 g/ ^m2 or more.

In an eleventh aspect of the present disclosure, in the blank material according to the tenth aspect described above, the first folding line may include a plurality of second cut portions penetrating the blank material, and each of the second cut portions may have a length of 35 mm or less.

A twelfth aspect of the present disclosure is a blank material comprising 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 of the side panels via a second fold line, a gap is formed between the side panels, the second fold line includes first thin portions formed at both ends and a plurality of first cut portions formed between the first thin portions and penetrating the blank material, and the length of the first thin portions is 10 mm or more.

In a thirteenth aspect of the present disclosure, in the blank material according to the twelfth aspect described above, the first fold line may include second thin-walled portions formed at both ends and a plurality of second cut portions formed between the second thin-walled portions and penetrating the blank material, and the length of the second thin-walled portions may be 10 mm or more.

This disclosure makes it possible to prevent pinholes from forming in the molded film.

FIG. 1 is a vertical cross-sectional view showing a paper container with a lid according to the present embodiment. FIG. 2 is a perspective view showing a paper container with a lid according to this embodiment. FIG. 3 is a plan view showing a paper container with a lid according to this embodiment. FIG. 4 is a perspective view showing a paper container according to the present embodiment. FIG. 5A is a plan view showing a paper container according to the present embodiment. FIG. 5B is an enlarged plan view showing a paper container according to the present embodiment (an enlarged plan view corresponding to part VB in FIG. 5A). FIG. 6A is a plan view showing a blank according to this embodiment. FIG. 6B is an enlarged plan view showing a blank piece according to this embodiment (an enlarged plan view corresponding to part VIB in FIG. 6A). FIG. 7 is a cross-sectional view showing a method for manufacturing a paper container according to this embodiment. FIG. 8 is a cross-sectional view showing a method for manufacturing a paper container according to this embodiment. FIG. 9 is a cross-sectional view showing a method for manufacturing a paper container according to this embodiment. FIG. 10 is a plan view showing a modified example of the paper container according to the present embodiment. FIG. 11 is a plan view showing a modification of the blank piece according to the present embodiment. FIG. 12 is an enlarged plan view (corresponding to the partially enlarged view of FIG. 10) showing another modified example of the paper container according to the present embodiment. FIG. 13 is an enlarged plan view (corresponding to the partially enlarged view of FIG. 11) showing another modified example of the blank piece according to the present embodiment. FIG. 14 is an enlarged plan view (corresponding to the partially enlarged view of FIG. 10) showing another modified example of the paper container according to the present embodiment. FIG. 15 is an enlarged plan view (corresponding to the partially enlarged view of FIG. 11) showing another modified example of the blank piece according to the present embodiment. FIG. 16 is a plan view showing a blank for producing the paper container with a lid of Reference Example 1. As shown in FIG.

The present embodiment will be described below with reference to the drawings. Figures 1 to 9 are diagrams showing the present embodiment. Each of the figures shown below is a schematic diagram. Therefore, the size and shape of each part are appropriately exaggerated to facilitate understanding. In addition, appropriate modifications can be made within the scope of the technical concept. In each of the figures shown below, the same parts are given the same reference numerals, and some detailed explanations may be omitted. In addition, the numerical values such as dimensions of each member and the material names described in this specification are examples of the embodiment, and are not limited to these, and can be selected and used as appropriate. In this specification, terms that specify shapes or geometric conditions, such as parallel, orthogonal, and vertical, are interpreted to include substantially the same state in addition to their strict meaning.

In the following embodiments, the "X direction" is a direction parallel to the longitudinal direction of the paper container with a lid. The "Y direction" is a direction perpendicular to the X direction and parallel to the width direction of the paper container with a lid. The "Z direction" is 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, "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, "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, "rear surface" refers to the surface opposite to the front surface.

1 to 3, a paper container with a lid 1 according to the present embodiment includes a paper container 10 and a lid 50 that seals the paper container 10. Here, the paper container 10 will first be described.

1 to 3, a paper container 10 includes a paper container 20 and a forming film 40 laminated on the surface of the paper container 20. The paper container 20 is a container produced by assembling blanks 30, which will be described later.

(Paper container)
As shown in Figures 4 and 5A, 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.

The bottom 21 has a generally pentagonal shape when viewed from above. The bottom 21 may have a polygonal shape, such as an octagonal shape, when viewed from above.

The first fold line 22 connecting the bottom 21 and the side 23 may be formed in a perforated shape or 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 molded film 40 is pressed against the paper container 20 in the vicinity of the first fold line 22 by sucking air through the suction holes 61 of the cavity side mold 60 described below. This improves the adhesion between the molded film 40 and the paper container 20.

As shown in FIG. 5B, in this embodiment, the first fold line 22 is formed in a perforated shape. In this case, the first fold line 22 includes a plurality of cut portions (second cut portions) 22a that penetrate the paper container 20. The first fold line 22 also has a connecting portion (second connecting portion) 22b provided between adjacent cut portions 22a. The connecting portion 22b is a portion that does not penetrate the paper container 20.

The length L1 of each cut portion 22a may be 30 mm or less. This prevents a part of the molded film 40 from entering the cut portion 22a when the molded film 40 is adhered to the paper container 20. In addition, by making the length L1 30 mm or less, the molded film 40 can be prevented from getting caught in the cut portion 22a when the molded film 40 is adhered to the paper container 20. This prevents pinholes from occurring in the molded film 40. The lower limit of the length L1 of each cut portion 22a is not particularly limited, but may be 10 mm or more. This makes it easier to press the molded film 40 against the paper container 20 in the vicinity of the first fold line 22 when air is sucked through the suction hole 61 of the cavity side mold 60 described later. This makes it possible to further improve the adhesion between the molded film 40 and the paper container 20.

Referring again to FIG. 4 and FIG. 5A, each side portion 23 extends upward from the bottom portion 21. In this embodiment, the multiple side portions 23 include a first side portion 23a to a fifth side portion 23e that are 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 octagonal pyramid shape.

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 tiny gaps are formed between each side portion 23 to allow air to pass through, and the molded film 40 is pressed against the paper container 20 by sucking air through the suction holes 61 of the cavity side mold 60 described below.

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 molded film 40 is pressed against the paper container 20 in the vicinity of the second fold line 24 by sucking air through the suction holes 61 of the cavity side mold 60 described below. This improves the adhesion between the molded film 40 and the paper container 20.

As shown in FIG. 5B, in this embodiment, the second fold line 24 is formed in a perforated shape. In this case, the second fold line 24 includes a plurality of cut portions (first cut portions) 24a that penetrate the paper container 20. The second fold line 24 also has a connecting portion (first connecting portion) 24b provided between adjacent cut portions 24a. The connecting portion 24b is a portion that does not penetrate the paper container 20.

The length L2 of each cut portion 24a may be 30 mm or less. This prevents a part of the molded film 40 from entering the cut portion 24a of the second fold line 24 when the molded film 40 is bonded to the paper container 20, as described later. In addition, by having the length L2 be 30 mm or less, when the film 40a constituting the molded film 40 is stretched, it is possible to prevent a part of the film 40a from getting caught in the cut portion 24a. This prevents pinholes from being generated in the molded film 40. The lower limit of the length L2 of each cut portion 24a is not particularly limited, but may be 5 mm or more. This makes it easier to press the molded film 40 against the paper container 20 in the vicinity of the second fold line 24 when air is sucked through the suction hole 61 of the cavity side mold 60 described later. This makes it possible to further improve the adhesion between the molded film 40 and the paper container 20.

Referring again to Figures 4 and 5A, each flange piece 25 protrudes horizontally from the upper end of the side portion 23 toward the side. The flange pieces 25 are formed in an annular shape as a whole. In addition, 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.

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. Among these, 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 in a V shape as a whole. On the other hand, 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.

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 shorter 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.

Also, as shown in FIG. 5A, 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).

The 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. This improves the adhesion between the flange pieces 25 and the molded film 40 around the entire circumference of the paper container 20. In addition, since the flange pieces 25 are adjacent to each other without overlapping, it is possible to prevent pinholes and the like from occurring in the molded film 40 when the molded film 40 is adhered to the paper container 20. Furthermore, since the flange pieces 25 are 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 lid material 50 in the area of the molded film 40 of the paper container 10 that corresponds to the flange pieces 25. This prevents poor sealing of the lid material 50.

(Blank material)
Next, a description will be given of a blank 30 for producing the paper container 20. As shown in Fig. 6A, 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.

The bottom panel 31, the first fold line 32, the side panel 33, the second fold line 34, and the flange piece panel 35 of the blank material 30 correspond to the bottom 21, the first fold line 22, the side 23, the second fold line 24, and the flange piece 25 of the paper container 20, respectively. Therefore, the first fold line 32 is formed in a perforated shape. In this case, as shown in FIG. 6B, the first fold line 32 includes a plurality of cut portions (second cut portions) 32a that penetrate the blank material 30. The first fold line 32 also has a connecting portion (second connecting portion) 32b provided between adjacent cut portions 32a. The connecting portion 32b is a portion that does not penetrate the blank material 30.

The cut portion 32a and the connecting portion 32b of the first fold line 32 of the blank material 30 correspond to the cut portion 22a and the connecting portion 22b of the first fold line 22 of the paper container 20, respectively. Therefore, the length L3 of each cut portion 32a may be 30 mm or less, or 10 mm or more.

As described above, the side panels 33 of the blank 30 correspond to the sides 23 of the paper container 20. Therefore, as shown in FIG. 6A, the side panels 33 include the first side panel 33a to the fifth side panel 33e that are adjacent to each other. The first side panel 33a to the fifth side panel 33e correspond to the first side 23a to the fifth side 23e of the paper container 20, respectively.

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 addition, 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 to 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 it moves from the first fold line 32 side to 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 Figures 2 to 4).

As described above, the second fold line 34 of the blank material 30 corresponds to the second fold line 24 of the paper container 20. The second fold line 34 is formed in a perforated shape. In this case, as shown in FIG. 6B, the second fold line 34 includes a plurality of cut portions (first cut portions) 34a that penetrate the blank material 30. The second fold line 34 also has a connecting portion (first connecting portion) 34b provided between adjacent cut portions 34a. The connecting portion 34b is a portion that does not penetrate the blank material 30.

The cut portion 34a and the connecting portion 34b of the second fold line 34 of the blank material 30 correspond to the cut portion 24a and the connecting portion 24b of the second fold line 24 of the paper container 20, respectively. Therefore, the length L4 of each cut portion 34a may be 30 mm or less, or 5 mm or more.

Furthermore, as described above, the flange piece panel 35 of the blank material 30 corresponds to the flange piece 25 of the paper container 20. For this reason, as shown in FIG. 6A, the multiple flange piece panels 35 include the first flange piece panel 35a to the fifth flange piece panel 35e that face each other through the gap 36. The first flange piece panel 35a to the fifth flange piece panel 35e are panels that 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 FIG. 4 and FIG. 5A)) formed by the other flange piece panels 35 when the blank material 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. Also, as shown in FIG. 6A, 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 the flange piece panel refers to the length of the 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).

The bottom panel 31, side panel 33, and flange piece panel 35 of such a 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.

Examples of the paper material that can be used to make up the blank 30 include various types of paperboard, coated paper, card paper, ivory paper, milk carton base paper, cup base paper, coated cardboard, and other processed papers having a ^basis weight of approximately 150 g/m2 or more and 800 g/ ^m2 or less.

(Formed film)
Next, the molded film 40 will be described with reference to Figs. 1 to 3. This molded film 40 serves to protect 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 adhered 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 thickness of the molded film 40 may be, for example, 100 μm or more and 130 μm or less. By making the thickness of the molded film 40 100 μm or more, the occurrence of pinholes in the molded film 40 can be effectively suppressed. In addition, by making the thickness of the molded film 40 130 μm or less, the moldability of the paper container 10 can be improved. That is, as described below, when the molded film 40 is adhered to the paper container 20, in order to improve the moldability (stretchability) of the molded film 40, the molded film 40 (film 40a described later) is heated by a hot plate 62 (see FIG. 8). Here, if the thickness of the molded film 40 is increased, the heating temperature at which the molded film 40 is heated by the hot plate 62 may become high. In contrast, by making the thickness of the molded film 40 130 μm or less, the heating temperature at which the molded film 40 (film 40a) is heated can be suppressed from becoming too high. As a result, the moldability of the paper container 10 can be improved.

Such a molded film 40 may be a film made of a thermoplastic resin having water resistance, sealing properties, and heat fusion properties. 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 it is desired to impart gas barrier properties to the paper container 10, a laminate having a gas barrier material such as ethylene-vinyl alcohol copolymer (EVOH) laminated in the middle 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.

The molded 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 (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)

Each of the above layers is formed according to conventional methods, such as dry lamination, extrusion lamination, extrusion coating, or other coating methods.

Lid material Next, the lid material 50 will be described with reference to FIG. 3. The lid material 50 is sealed to the molded film 40 by an inner seal portion H1 formed around the entire periphery 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 at 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 portion) 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 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".

The above-mentioned inner seal portion H1 may be formed over the entire area of the flange piece 25, or may be formed over only a portion of the area in the width direction of the flange piece 25. For example, the inner seal portion H1 may not 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 to straddle the outer edge of the flange piece 25.

Here, on at least one flange piece 25, at least a part of the outer edge of the inner seal portion H1 is convex toward the outside. In this embodiment, on the second flange piece 25b, the entire outer edge of the inner seal portion H1 is convex toward the outside. Although not shown, on flange pieces 25 other than the second flange piece 25b, at least a part of the outer edge of the inner seal portion H1 may be convex toward the outside. In other words, on at least one flange piece 25 among the first flange piece 25a, the third flange piece 25c, the fourth flange piece 25d, and the fifth flange piece 25e, at least a part of the outer edge of the inner seal portion H1 may be convex toward the outside.

In this embodiment, on the second flange piece 25b, 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 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, on the second flange piece 25b, the outer edge of the inner seal portion H1 extends along a direction that is inclined toward the second fold line 24 to which the second flange piece 25b is adjacent. And, the outer edge of the inner seal portion H1 is formed into a V-shape overall.

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.

Next, the outer seal portion H2 will be described. As described above, the outer seal portion H2 is formed at a position that does not overlap the flange piece 25 in a plan view. Therefore, the outer seal portion H2 surrounds the flange piece 25 over its entire circumference.

Here, at least a part of the outer edge of the portion of the outer seal portion H2 surrounding at least one flange piece 25 is convex toward the outside. In this embodiment, the entire outer edge of the portion of the outer seal portion H2 surrounding the second flange piece 25b is convex toward the outside. Although not shown, at least a part of the outer edge of the portion of the outer seal portion H2 surrounding a flange piece 25 other than the second flange piece 25b may be convex toward the outside. In other words, at least a part of the outer edge of the portion of the outer seal portion H2 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.

In this embodiment, the outer edge of the portion of the outer seal portion H2 that surrounds the second flange piece 25b 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. In this case, the outer edge of the portion of the outer seal portion H2 that surrounds the second flange piece 25b extends in 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 portion of the outer seal portion H2 includes a portion that is formed in a V shape.

On the other hand, the outer edge of the portion of the outer seal part H2 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 outer seal part H2 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. Also, the outer edge of the portion of the outer seal part H2 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.

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

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 deposition layer (12 μm) / nylon film (15 μm) / polyethylene film (40 μm) (contents side)

Each of the above layers is formed according to conventional methods, such as dry lamination, extrusion lamination, extrusion coating, or other coating methods.

In the paper container 1 with a lid material configured as described above, first, the contents are filled into the paper container 10. Next, the lid material 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 material filled with the contents. The paper container 1 with a lid material 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, and dairy products.

Next, the operation of this embodiment having such a configuration will be described. Here, the manufacturing method of the paper container 10 and the manufacturing method of the paper container with lid 1 will be described with reference to Figures 7 to 9.

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

Next, as shown in FIG. 7, the blank 30 is attached to the cavity side mold 60. A suction hole 61 is formed in the 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. This results in a paper container 20 attached to the cavity side mold 60.

Then, the paper container 20 and the formed film 40 are subjected to vacuum forming, thereby laminating the formed film 40 on the surface of the paper container 20. At this time, first, as shown in FIG. 8, the film 40a constituting the formed 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 formed film 40 laminated on the paper container 20 is obtained, as shown in FIG. 9. In this way, the paper container 10 is obtained.

Here, when the film 40a is sucked to the paper container 20, the film 40a is sucked to the paper container 20 while being stretched. In this case, the amount of stretching of the film 40a is large between the flange piece 25 and the side portion 23 (i.e., the second fold line 24). Therefore, the thickness of the molded film 40 composed of the film 40a between the flange piece 25 and the side portion 23 (i.e., the second fold line 24) may be thinner than other parts of the molded film 40. In addition, due to the thinner thickness of the molded film 40, a part of the molded film 40 may get into the cut portion 24a of the second fold line 24.

In contrast, in this embodiment, the length L2 of each cut portion 24a is 30 mm or less. This prevents a part of the molded film 40 from getting into the cut portion 24a of the second fold line 24. In addition, by making the length L2 30 mm or less, when the film 40a constituting the molded film 40 is stretched, it is possible to prevent a part of the film 40a from getting caught in the cut portion 24a. This prevents pinholes from being generated in the molded film 40. When air is sucked through the suction hole 61, air may be sucked through the suction hole 61 so that the degree of vacuum between the cavity side mold 60 and the molded film 40 is, for example, 50 Pa or more and 2000 Pa or less, preferably 100 Pa or more and 1000 Pa or less.

Next, we will explain the manufacturing method for the paper container with lid 1.

First, in parallel with the production of the paper container 10, a laminate is prepared as the lid material 50. At this time, the desired laminate is produced by a method such as dry lamination.

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

Next, the laminate is sealed to the molded film 40 by a sealing hot plate (not shown). The laminate is sealed to the molded film 40 by the inner seal portion H1 and the outer seal portion H2 formed around the entire circumference. At this time, the air inside the paper container 10 may be replaced by, 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 by 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 by a sealing hot plate (not shown). This ensures that the laminate is sealed to the molded film 40 around the entire circumference. After that, the molded film 40 and the laminate are cut into a predetermined shape by a blade or the like.

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

As described above, according to this embodiment, the second fold line 24 of the paper container 20 includes a plurality of cut portions 24a that penetrate the paper container 20. The length L2 of each cut portion 24a is 30 mm or less. This makes it possible to prevent a portion of the molded film 40 from entering the cut portion 24a of the second fold line 24. Furthermore, by making the length L2 30 mm or less, it is possible to prevent a portion of the film 40a from getting caught in the cut portion 24a when the film 40a constituting the molded film 40 is stretched. This makes it possible to prevent pinholes from occurring in the molded film 40.

In the above-described embodiment, an example has been described in which the length L2 (L4) of each cut portion 24a (cut portion 34a) is 30 mm or less. However, this is not limited thereto, and for example, the length L2 (L4) of each cut portion 24a (cut portion 34a) may be 35 mm or less. In this case, the basis weight of the paper constituting the paper container 20 (blank 30) may be 350 g/ ^m2 or more. In addition, the length L1 (L3) of each cut portion 22a (cut portion 32a) may be 35 mm or less.

As described above, when the film 40a is attached to the paper container 20, the film 40a is stretched while being attached to the paper container 20. In this case, between the side portions 23, the film 40a can stretch not only in the Z direction, but also along the X direction and the Y direction. Therefore, even between the side portions 23, the thickness of the formed film 40 composed of the film 40a can be thinner than other parts of the formed film 40. Furthermore, due to the thinner thickness of the formed film 40, there is a possibility that part of the formed film 40 will get in between the side portions 23.

In contrast, in this modified example, the basis weight of the paper constituting the paper container 20 (blank material 30) is 350 g/ ^m2 or more. This increases the rigidity of the paper container 20 (blank material 30). This makes it possible to prevent the paper container 20 from being deformed when the film 40a is attached to the paper container 20. As a result, it is possible to prevent gaps from being formed between the side portions 23. This makes it possible to prevent a part of the formed film 40 from getting in between the side portions 23. As a result, it is possible to prevent pinholes from being formed in the formed film 40.

As described above, since the basis weight of the paper constituting the paper container 20 (blank material 30) is 350 g/ ^m2 or more, the rigidity of the paper container 20 (blank material 30) can be increased, and deformation of the paper container 20 can be suppressed when the film 40a is sucked onto the paper container 20. Therefore, even if the length L2 (L4) of each cut portion 24a (cut portion 34a) is longer than 30 mm (35 mm or less), when the film 40a constituting the molded film 40 is stretched, it is possible to suppress a part of the film 40a from being caught by the cut portion 24a. Therefore, it is possible to suppress the occurrence of pinholes in the molded film 40.

In the above-described embodiment, an example was described in which the second fold line 24 includes multiple cuts (first cuts) 24a that penetrate the paper container 20. In this case, as shown in FIG. 10, the second fold line 24 of the paper container 20 may include thin-walled portions (first thin-walled portions) 24c formed at both ends and multiple cuts (first cuts) 24a formed between the thin-walled portions 24c and penetrating the paper container 20. The second fold line 24 may further include a connecting portion (first connecting portion) 24b provided between adjacent cuts 24a. Note that FIG. 10 illustrates only the thin-walled portion 24c formed at one end of the thin-walled portions 24c formed at both ends of the second fold line 24.

The thin-walled portion 24c may be a half-cut line or a pressed line. The length L5 of each thin-walled portion 24c may be 10 mm or more. This more effectively prevents pinholes from occurring in the molded film 40. The upper limit of the length L5 of each thin-walled portion 24c is not particularly limited, but may be 50% or less of the length of each second fold line 24. This prevents the length of the cut portion 24a from becoming too short. Therefore, when air is sucked through the suction hole 61 of the cavity side mold 60, the molded film 40 is easily pressed against the paper container 20 in the vicinity of the second fold line 24. This further improves the adhesion between the molded film 40 and the paper container 20.

The thickness of the thin-walled portion 24c may be 30% or more and 70% or less of the thickness of the connecting portion 24b.

In addition, in this modified example, as shown in FIG. 11, the second fold line 34 of the blank material 30 may include a thin portion (first thin portion) 34c formed at both ends and a plurality of cut portions (first cut portions) 34a formed between the thin portions 34c and penetrating the blank material 30. In this case, the second fold line 34 of the blank material 30 may further include a connecting portion (first connecting portion) 34b provided between adjacent cut portions 34a. Note that, in FIG. 11, of the thin portions 34c formed at both ends of the second fold line 34, only the thin portion 34c formed at one end is illustrated.

The thin-walled portion 34c of the blank 30 corresponds to the thin-walled portion 24c of the paper container 20. Therefore, the length L7 of the thin-walled portion 34c may be 10 mm or more. Furthermore, the length L7 of the thin-walled portion 34c may be 50% or less of the length of each second fold line 34. Furthermore, the thickness of the thin-walled portion 34c may be 30% or more and 70% or less of the thickness of the connecting portion 34b.

In this modified example, the second fold line 24 of the paper container 20 includes a thin portion (first thin portion) 24c formed at both ends and a plurality of cut portions (first cut portions) 24a formed between the thin portions 24c and penetrating the paper container 20. In addition, the length L5 of each thin portion 24c is 10 mm or more. This more effectively prevents pinholes from occurring in the molded film 40. That is, as described above, when the film 40a is sucked to the paper container 20, the amount of stretching of the film 40a is large between the flange piece 25 and the side portion 23 (i.e., the second fold line 24). Therefore, the thickness of the molded film 40 composed of the film 40a may be thinner between the flange piece 25 and the side portion 23 (i.e., the second fold line 24) than other parts of the molded film 40. As described above, the thickness of the molded film 40 made of the film 40a may be thinner between the side portions 23 than in other parts of the molded film 40. Therefore, the thickness of the molded film 40 made of the film 40a may be very thin in the vicinity of the side portions 23 between the flange pieces 25 and the side portions 23 (i.e., the second fold line 24). Here, in this modified example, the thin-walled portion 24c is formed at both ends of the second fold line 24, and the length L5 of the thin-walled portion 24c is 10 mm or more. This makes it possible to prevent the part of the molded film 40 that may be very thin from entering the cut portion 24a. Also, the thin-walled portion 24c is formed at both ends of the second fold line 24, and the length L5 of the thin-walled portion 24c is 10 mm or more, making it possible to prevent the part of the molded film 40 that may be very thin from getting caught in the cut portion 24a. This makes it possible to more effectively prevent the molded film 40 from having pinholes.

As shown in FIG. 12, the first fold line 22 of the paper container 20 may include thin-walled portions (second thin-walled portions) 22c formed at both ends and multiple cuts (second cuts) 22a formed between the thin-walled portions 22c and penetrating the paper container 20. The first fold line 22 may further include a connecting portion (second connecting portion) 22b provided between adjacent cuts 22a.

The thin-walled portion 22c may be a half-cut line or a pressed line. The length L6 of each thin-walled portion 22c may be 10 mm or more. This more effectively prevents pinholes from occurring in the molded film 40. The upper limit of the length L6 of each thin-walled portion 22c is not particularly limited, but may be 50% or less of the length of each first fold line 22. This prevents the length of the cut portion 22a from becoming too short. Therefore, when air is sucked through the suction hole 61 of the cavity side mold 60, the molded film 40 is easily pressed against the paper container 20 in the vicinity of the first fold line 22. This further improves the adhesion between the molded film 40 and the paper container 20.

The thickness of the thin-walled portion 22c may be 30% or more and 70% or less of the thickness of the connecting portion 22b.

In this case, as shown in FIG. 13, the first fold line 32 of the blank material 30 may include thin portions (second thin portions) 32c formed at both ends, and multiple cut portions (second cut portions) 32a formed between the thin portions 32c and penetrating the blank material 30. The first fold line 32 may further include connecting portions (second connecting portions) 32b provided between adjacent cut portions 32a.

The thin-walled portion 32c of the blank 30 corresponds to the thin-walled portion 22c of the paper container 20. Therefore, the length L8 of the thin-walled portion 32c may be 10 mm or more. Furthermore, the length L8 of the thin-walled portion 32c may be 50% or less of the length of each first fold line 32. Furthermore, the thickness of the thin-walled portion 32c may be 30% or more and 70% or less of the thickness of the connecting portion 32b.

14, only the first fold line 22 of the paper container 20 may include the thin portion 22c, and the second fold line 24 may not include the thin portion 24c. In this case, the length L2 of the cut portion 24a of the second fold line 24 may be 30 mm or less. Alternatively, the basis weight of the paper constituting the paper container 20 may be 350 g/ ^m2 or more.

15, only the first fold line 32 of the blank piece 30 may include the thin portion 32c, and the second fold line 34 may not include the thin portion 34c. In this case, the length L4 of the cut portion 34a of the second fold line 34 may be 30 mm or less. Alternatively, the basis weight of the paper constituting the paper container 20 may be 350 g/ ^m2 or more.

Next, we will describe a specific example of the above embodiment.

(Example A1)
First, the blank material 30 shown in Fig. 6A was produced. In this case, a paperboard (product name: N-Pearl Card, manufactured by Mitsubishi Paper Mills) with a basis weight of 260 g/ ^m2 was prepared as the material for the blank material 30. Then, the coated paper was punched into a predetermined shape to produce the blank material 30. At this time, the length L1 of the cut portion 32a of the first fold line 32 was set to 30 mm, and the length L2 of the cut portion 34a of the second fold line 34 was set to 30 mm.

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

Next, the obtained blank 30 was attached to the cavity side mold 60 and assembled to produce the paper container 20. Then, the molded film 40 was laminated on the surface of the paper container 20 to produce the paper container 10. At this time, the heating temperature and heating time of the molded film 40 was 170°C, and the heating time of the molded film 40 was 3 seconds. In addition, when air was sucked through the suction hole 61, air was sucked through the suction hole 61 so that the degree of vacuum between the cavity side mold 60 and the molded film 40 was 1000 Pa.

Next, a sealability evaluation test was conducted. First, a test liquid (Ageless Seal Check (product name) manufactured by Mitsubishi Gas Chemical) was applied to the surface of the molded film 40. The test liquid was applied to the surface of the molded film 40 in an amount of 5 mL or more and 10 mL or less.

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)
At this time, the sealing temperature when the film constituting the lid material 50 was sealed to the molded film 40 by a sealing hot plate (not shown) or the like was 140° C., and the sealing time when the film was sealed to the molded film 40 was 3 seconds. In this manner, the paper container with lid material 1 shown in FIG. 1 was produced.

Then, the resulting paper container 1 with lid was stored for one day, and then it was checked whether the test liquid had leaked from the paper container 1 with lid.

(Example A2)
A sealability evaluation test was carried out in the same manner as in Example A1, except that the lengths L1 and L2 were each 20 mm.

(Example A3)
A sealability evaluation test was carried out in the same manner as in Example A1, except that the lengths L1 and L2 were each 10 mm.

(Example A4)
A sealability evaluation test was carried out in the same manner as in Example A1, except that the lengths L1 and L2 were each 5 mm.

(Example A5)
A sealability evaluation test was conducted in the same manner as in Example A1, except that the lengths L1 and L2 were each 35 mm, and the basis weight of the paper constituting the blank material 30 was 350 g/m ² .

(Example B1)
A sealing property evaluation test was performed in the same manner as in Example A1, except that the blank material 30 shown in Figure 11 was prepared, the length L7 of the thin-walled portion 34c (the length L5 of the thin-walled portion 24c) was 10 mm, and the lengths L1 and L2 were each 35 mm.

(Example B2)
A sealing property evaluation test was carried out in the same manner as in Example B1, except that the length L7 of the thin-walled portion 34c (the length L5 of the thin-walled portion 24c) was 20 mm.

(Example B3)
A sealing property evaluation test was carried out in the same manner as in Example B1, except that the length L7 of the thin-walled portion 34c (the length L5 of the thin-walled portion 24c) was 30 mm.

(Example B4)
A sealability evaluation test was conducted in the same manner as in Example B1, except that the length L7 of the thin-walled portion 34c (the length L5 of the thin-walled portion 24c) was 5 mm, and the basis weight of the paper constituting the blank material 30 was 350 g/ ^m2 .

(Example C1)
A sealing property evaluation test was conducted in the same manner as in Example B1, except that the blank material 30 shown in Figure 13 was prepared and the length L8 of the thin-walled portion 32c (the length L6 of the thin-walled portion 22c) was 10 mm.

(Example C2)
A sealing evaluation test was conducted in the same manner as in Example C1, except that the length L8 of the thin-walled portion 32c (the length L6 of the thin-walled portion 22c) was 20 mm, and the length L7 of the thin-walled portion 34c (the length L5 of the thin-walled portion 24c) was 20 mm.

(Example C3)
A sealing evaluation test was conducted in the same manner as in Example C1, except that the length L8 of the thin-walled portion 32c (the length L6 of the thin-walled portion 22c) was 30 mm, and the length L7 of the thin-walled portion 34c (the length L5 of the thin-walled portion 24c) was 30 mm.

(Example C4)
A sealing evaluation test was conducted in the same manner as in Example C1, except that the length L8 of the thin-walled portion 32c (the length L6 of the thin-walled portion 22c) was 5 mm, the length L7 of the thin-walled portion 34c (the length L5 of the thin-walled portion 24c) was 5 mm, and the basis weight of the paper constituting the blank material 30 was 350 g/ ^m2 .

Example D
A sealing property evaluation test was carried out in the same manner as in Example A1, except that the blank material 30 shown in FIG. 15 was produced, the length L8 of the thin-walled portion 32c (the length L6 of the thin-walled portion 22c) was 5 mm, and the basis weight of the paper constituting the blank material 30 was 350 g/ ^m2 .

Comparative Example A
A sealability evaluation test was carried out in the same manner as in Example A1, except that the lengths L1 and L2 were each 35 mm.

(Comparative Example B)
A sealing property evaluation test was carried out in the same manner as in Example B1, except that the length L7 of the thin-walled portion 34c (the length L5 of the thin-walled portion 24c) was 5 mm.

Comparative Example C
A sealing evaluation test was conducted in the same manner as in Example C1, except that the length L8 of the thin-walled portion 32c (the length L6 of the thin-walled portion 22c) was 5 mm, and the length L7 of the thin-walled portion 34c (the length L5 of the thin-walled portion 24c) was 5 mm.

(Comparative Example D1)
A sealability evaluation test was conducted in the same manner as in Example D, except that the length L8 of the thin-walled portion 32c (the length L6 of the thin-walled portion 22c) was 5 mm, and the basis weight of the paper constituting the blank material 30 was 260 g/ ^m2 .

(Comparative Example D2)
A sealability evaluation test was conducted in the same manner as in Example D, except that the length L8 of the thin-walled portion 32c (the length L6 of the thin-walled portion 22c) was 10 mm, and the basis weight of the paper constituting the blank material 30 was 260 g/ ^m2 .

(Comparative Example D3)
A sealability evaluation test was conducted in the same manner as in Example D, except that the length L8 of the thin-walled portion 32c (the length L6 of the thin-walled portion 22c) was 20 mm, and the basis weight of the paper constituting the blank material 30 was 260 g/ ^m2 .

(Comparative Example D4)
A sealability evaluation test was conducted in the same manner as in Example D, except that the length L8 of the thin-walled portion 32c (the length L6 of the thin-walled portion 22c) was 30 mm, and the basis weight of the paper constituting the blank material 30 was 260 g/ ^m2 .

(Reference Example 1)
As shown in Fig. 16, a blank 30A was prepared in which the second folded line 34 included only the thin portion 34c, and the length L1 was 35 mm. The sealing property evaluation test was carried out in the same manner as in Example A1, except that the thin portion 34c was a half-cut line.

(Reference Example 2)
A sealability evaluation test was carried out in the same manner as in Reference Example 1, except that the thin-walled portion 34c was a pressed line.

The above results are shown in Tables 1 and 2.

In Table 1 above, "○" means that there was no leakage of the test liquid into the paper container 1 with a lid. Also, "×" means that there was leakage of the test liquid into the paper container with a lid.

As a result, as shown in Table 1, liquid leakage occurred in the paper containers with lids according to Comparative Examples A to D4.

In contrast, in the paper containers 1 with lids according to Examples A1 to D, no liquid leakage occurred in the paper containers 1 with lids. Therefore, it was found that the paper containers 1 with lids according to this embodiment can improve the sealing performance.

The present disclosure is not limited to the above-described embodiment and each modified example, and in the implementation stage, the components can be modified to the extent that does not deviate from the gist of the disclosure. In addition, various inventions can be formed by appropriate combinations of the multiple components disclosed in the above-described embodiment and each modified example. Some components may be deleted from all the components shown in the embodiment and each modified example.

REFERENCE SIGNS LIST 1 Paper container with lid 10 Paper container 20 Paper container 21 Bottom 22 First fold line 22a Cut portion 22c Thin portion 23 Side 24 Second fold line 24a Cut portion 24c Thin portion 25 Flange piece 30 Blank material 31 Bottom panel 32 First fold line 32a Cut portion 32c Thin portion 33 Side panel 34 Second fold line 34a Cut portion 34c Thin portion 35 Flange piece panel 36 Gap 40 Formed film 50 Lid

Claims (13)

Paper containers and
A formed film laminated on a surface of the paper container,
The paper container comprises:
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 second fold line includes a plurality of first cut portions penetrating the paper container,
A paper container, wherein each of the first cut portions has a length of 30 mm or less. The paper container according to claim 1, wherein the first fold line includes a plurality of second cuts penetrating the paper container, and each of the second cuts has a length of 30 mm or less. Paper containers and
A formed film laminated on a surface of the paper container,
The paper container comprises:
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 second fold line includes a plurality of first cut portions penetrating the paper container,
The length of each of the first cut portions is 35 mm or less;
A paper container, wherein the basis weight of the paper constituting the paper container is 350 g/ ^m2 or more. The paper container according to claim 3, wherein the first fold line includes a plurality of second cuts penetrating the paper container, and each of the second cuts has a length of 35 mm or less. Paper containers and
A formed film laminated on a surface of the paper container,
The paper container comprises:
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 second broken line is
First thin portions formed at both ends;
a plurality of first cut portions formed between the first thin portions and penetrating the paper container;
A paper container, wherein the length of the first thin-walled portion is 10 mm or more. The paper container according to claim 5, wherein the first fold line includes second thin-walled portions formed at both ends and a plurality of second cuts formed between the second thin-walled portions and penetrating the paper container, and the length of the second thin-walled portions is 10 mm or more. The paper container according to any one of claims 1 to 6,
A paper container with a lid, comprising a lid that seals the paper container. A blank material,
A bottom panel;
a plurality of side panels connected to the bottom panel via first fold lines;
a plurality of flange piece panels connected to each of the side panels via second fold lines,
A gap is formed between the side panels,
the second folding line includes a plurality of first cut portions penetrating the blank;
A blank material, wherein each of the first cut portions has a length of 30 mm or less. The blank material according to claim 8, wherein the first folding line includes a plurality of second cut portions penetrating the blank material, and the length of each of the second cut portions is 30 mm or less. A blank material,
A bottom panel;
a plurality of side panels connected to the bottom panel via first fold lines;
a plurality of flange piece panels connected to each of the side panels via second fold lines,
A gap is formed between the side panels,
the second folding line includes a plurality of first cut portions penetrating the blank;
The length of each of the first cut portions is 35 mm or less;
A blank material, wherein the basis weight of the paper constituting the blank material is 350 g/ ^m2 or more. The blank material according to claim 10, wherein the first fold line includes a plurality of second cut portions penetrating the blank material, and the length of each of the second cut portions is 35 mm or less. A blank material,
A bottom panel;
a plurality of side panels connected to the bottom panel via first fold lines;
a plurality of flange piece panels connected to each of the side panels via second fold lines,
A gap is formed between the side panels,
The second broken line is
First thin portions formed at both ends;
a plurality of first cut portions formed between the first thin portions and penetrating the blank;
A blank material, wherein the length of the first thin portion is 10 mm or more. The blank material according to claim 12, wherein the first fold line includes second thin-walled portions formed at both ends and a plurality of second cuts formed between the second thin-walled portions and penetrating the blank material, and the length of the second thin-walled portions is 10 mm or more.