JP2022112894A - Blank material, paper container and paper container with lid material - Google Patents

Abstract

To provide a blank material, paper container and paper container with a lid material that allow for improving sealability.SOLUTION: A blank material 30 comprises a bottom panel 31, a plurality of side panels 33 connected to the bottom panel 31 through first bend lines 32, and a plurality of flange-piece panels 35 respectively connected to the side panels 33 through second bend lines 34. Gaps 36B are formed between the side panels 33. In one flange-piece panel 35, a first recess 81 is formed. In the other flange-piece panel 35 opposed to the one flange-piece panel 35 through the gap 36, a first protrusion 82 is formed to be received in the first recess 81.SELECTED DRAWING: Figure 5

Description

The present disclosure relates to blanks, paper containers and paper containers with lids.

2. Description of the Related Art Conventionally, there have been known containers for housing take-out food and drink (so-called take-out products) and home delivery food and drink.

In recent years, there has been a demand for reducing the amount of resin used in such containers in order to reduce the problem of marine pollution and environmental impact. is in progress. As such a container, a paper container including a paper container and a formed film laminated on the inner wall of the paper container is known (for example, Patent Document 1). In such a paper container, after being filled with food, the paper container is covered with a cover material.

Japanese translation of PCT publication No. 2013-545675

However, in such a paper container, when the flange pieces are assembled together, there is a risk that a gap will occur at the joint between the flange pieces. In this case, when the paper container is sealed with the lid material, the lid material may not be sealed to the formed film in the region corresponding to the gap. If the lid is not sealed to the formed film in this manner, the paper container may not be sealed. If the paper container cannot be sealed, the contents filled in the paper container may leak out of the paper container.

The present disclosure has been made in consideration of such points, and an object of the present disclosure is to provide a blank material, a paper container, and a lid-attached paper container that can improve sealing performance.

The blank according to one embodiment includes a bottom panel, a plurality of side panels connected to the bottom panel via a first fold line, and a plurality of side panels connected to each side panel via a second fold line, respectively. A gap is formed between the side panels, a first recess is formed in the one flange piece panel, and the one flange piece panel is provided with the gap through the gap. The blank member has a first convex portion that is accommodated in the first concave portion is formed on the other flange piece panel that faces each other.

In the blank according to one embodiment, the first protrusion may be engaged with the first recess.

In the blank material according to one embodiment, the first convex portion may include at least a widened portion whose width gradually increases from the base end side to the tip end side.

In the blank material according to one embodiment, the first convex portion includes a narrow portion and a wide portion provided on the tip side of the narrow portion and having a wider width than the narrow portion. good.

In the blank according to one embodiment, at least a part of the outline of the first protrusion may have an arc shape in plan view.

In the blank material according to one embodiment, the first protrusion and the second polygonal line may be connected to each other.

In the blank according to one embodiment, the other flange piece panel is formed with a second concave portion, and the one flange piece panel is formed with a second convex portion that is accommodated in the second concave portion. may be

A paper container according to one embodiment is a paper container comprising a paper container produced by assembling the blank materials according to the present disclosure, and a formed film laminated on the surface of the paper container.

A paper container according to one embodiment comprises a bottom portion, a plurality of side portions connected to the bottom portion via a first fold line, and a plurality of flange pieces connected to each side portion via a second fold line. and a formed film laminated on the surface of the paper container, wherein the side portions are adjacent to each other without being continuous, and a first recess is formed in one flange piece. and a first protrusion that is accommodated in the first recess is formed on another flange piece adjacent to the one flange piece.

In the paper container according to one embodiment, the first protrusion may be engaged with the first recess.

In the paper container according to one embodiment, the first convex portion may include at least a widened portion whose width gradually widens from the base end side to the tip end side.

In the paper container according to one embodiment, the first convex portion includes a narrow portion and a wide portion provided on the tip side of the narrow portion and having a wider width than the narrow portion. good too.

In the paper container according to one embodiment, at least a part of the contour of the first protrusion may have an arc shape in plan view.

In the paper container according to one embodiment, the first protrusion and the second fold line may be connected to each other.

In the paper container according to one embodiment, the other flange piece is formed with a second concave portion, and the one flange piece is formed with a second convex portion that is accommodated in the second concave portion. may

A lidded paper container according to one embodiment is a lidded paper container including the paper container according to the present disclosure and a lid that seals the paper container.

According to the present disclosure, it is possible to improve the sealing performance of a paper container with a lid.

FIG. 1 is a vertical sectional view showing a paper container with lid material according to the present embodiment. FIG. 2 is a perspective view showing a paper container according to this embodiment. FIG. 3 is a plan view showing a paper container according to this embodiment. FIG. 4A is an enlarged plan view (an enlarged plan view corresponding to the IV section in FIG. 3) showing the paper container of the paper container according to the present embodiment. FIG. 4B is an enlarged plan view (a view corresponding to FIG. 4A) showing a comparative example of the paper container of the paper container according to the present embodiment. FIG. 5 is a plan view showing a blank material according to this embodiment. FIG. 6 is an enlarged plan view (an enlarged plan view corresponding to the VI section in FIG. 5) showing the blank according to this embodiment. FIG. 7 is a cross-sectional view showing a method of 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 cross-sectional view explaining the action of the paper container according to this embodiment. FIG. 11 is a cross-sectional view illustrating the action of the paper container according to this embodiment. FIG. 12 is an enlarged plan view (a view corresponding to FIG. 4A) showing a first modification of the paper container of the paper container according to the present embodiment. FIG. 13 is an enlarged plan view (a view corresponding to FIG. 6) showing a first modification of the blank according to the present embodiment. FIG. 14 is an enlarged plan view (a view corresponding to FIG. 4A) showing a second modification of the paper container of the paper container according to the present embodiment. FIG. 15 is an enlarged plan view (a view corresponding to FIG. 6) showing a second modification of the blank according to the present embodiment. FIG. 16 is an enlarged plan view (a view corresponding to FIG. 4A) showing a third modification of the paper container of the paper container according to the present embodiment. FIG. 17 is an enlarged plan view (a view corresponding to FIG. 6) showing a third modification of the blank according to the present embodiment. FIG. 18 is an enlarged plan view (a view corresponding to FIG. 4A) showing a fourth modification of the paper container of the paper container according to the present embodiment. FIG. 19 is an enlarged plan view (a view corresponding to FIG. 6) showing a fourth modification of the blank according to the present embodiment. FIG. 20 is an enlarged plan view (a view corresponding to FIG. 4A) showing another example of the fourth modification of the paper container of the paper container according to the present embodiment. FIG. 21 is an enlarged plan view (a view corresponding to FIG. 6) showing another example of the fourth modification of the blank according to the present embodiment. FIG. 22 is an enlarged plan view (a view corresponding to FIG. 4A) showing another example of the fourth modification of the paper container of the paper container according to the present embodiment. FIG. 23 is an enlarged plan view (a view corresponding to FIG. 6) showing another example of the fourth modification of the blank according to the present embodiment. FIG. 24 is an enlarged plan view (a view corresponding to FIG. 4A) showing a fifth modification of the paper container of the paper container according to the present embodiment. FIG. 25 is an enlarged plan view (a view corresponding to FIG. 6) showing a fifth modification of the blank according to the present embodiment. FIG. 26 is an enlarged plan view (a view corresponding to FIG. 4A) showing a sixth modification of the paper container of the paper container according to the present embodiment. FIG. 27 is an enlarged plan view (a view corresponding to FIG. 6) showing a sixth modification of the blank according to the present embodiment. FIG. 28 is a plan view (a view corresponding to FIG. 5) showing a blank material of a comparative example in the example.

Hereinafter, this embodiment will be described with reference to the drawings. 1 to 11 are diagrams showing this embodiment. Each figure shown below is shown typically. Therefore, the size and shape of each part are appropriately exaggerated for easy understanding. In addition, it is possible to modify and implement as appropriate without departing from the technical idea. In addition, in each figure shown below, the same code|symbol is attached|subjected to the same part and detailed description may be partially abbreviate|omitted. In addition, numerical values such as dimensions and material names of each member described in this specification are examples as an embodiment, and are not limited to these, and can be appropriately selected and used. In this specification, terms specifying shapes and geometrical conditions, such as parallel, orthogonal, and perpendicular terms, not only have strict meanings but also include substantially the same states. In this specification, the terms "upper" and "lower" respectively refer to the upper and lower sides of the paper container in an upright state (FIG. 1). In this specification, the term "surface" refers to the side facing the contents or the side facing upward when the paper container is erected.

Paper Container with Lid Material As shown in FIG. 1, the paper container 1 with lid material according to the present embodiment includes a paper container 10 and a lid material 50 for sealing the paper container 10 . Here, first, the paper container 10 will be described.

Paper Container As shown in FIGS. 1 to 3, the paper container 10 comprises a paper container 20 and a formed film 40 laminated on the surface of the paper container 20 . Of these, the paper container 20 is produced by assembling blank materials 30 to be described later.

(paper container)
The paper container 20 includes a bottom portion 21, a plurality of side portions 23 connected to the bottom portion 21 via first fold lines 22, and a plurality of flange pieces connected to each side portion 23 via second fold lines 24, respectively. 25.

Among them, the bottom portion 21 has a substantially rectangular shape in plan view. Note that the bottom portion 21 may have a polygonal shape such as an octagonal shape in plan view.

The first folding line 22 that connects the bottom portion 21 and the side portion 23 may be formed in a perforated line or a half-cut line. Thereby, the side portion 23 can be easily bent with respect to the bottom portion 21 . In the case where the first folding line 22 is formed in a perforated line, air is sucked from a suction hole 61 of a cavity-side mold 60, which will be described later. be forced. Thereby, the adhesion between the formed film 40 and the paper container 20 can be improved.

Each side portion 23 extends upward from the bottom portion 21 respectively. In the illustrated example, the paper container 20 has four side portions 23, and the side portions 23 are formed in the shape of an inverted truncated square pyramid as a whole. However, it is not limited to this, and the side portion 23 may be formed in a polygonal truncated pyramid shape such as an inverted octagonal truncated pyramid shape as a whole.

The multiple side portions 23 are adjacent to each other without being continuous with each other. That is, the side portions 23 are adjacent to each other without overlapping. Thereby, the adhesiveness between the side portion 23 and the formed film 40 can be improved over the entire circumference of the paper container 20 . In addition, since the side portions 23 are adjacent to each other without overlapping each other, it is possible to suppress the occurrence of pinholes or the like in the formed film 40 when the formed film 40 is adhered to the paper container 20. there is Between the side portions 23, minute gaps are formed through which air can pass, and by sucking air from suction holes 61 of the cavity-side mold 60, which will be described later, the molded film 40 is pulled into the paper container 20. configured to be pressed against

The second folding line 24 that connects the side portion 23 and the flange piece 25 may be formed in a perforated pattern or a half-cut line, like the first folding line 22 . Thereby, the flange piece 25 can be easily bent with respect to the side portion 23 . When the second folding line 24 is formed in a perforated line, air is sucked from a suction hole 61 of a cavity-side mold 60, which will be described later. be forced. Thereby, the adhesion between the formed film 40 and the paper container 20 can be improved.

Each flange piece 25 protrudes horizontally from the upper end of the side portion 23 toward the side. In the illustrated example, the paper container 20 has four flange pieces 25 . Specifically, the paper container 20 includes a pair of first flange pieces 25a extending along the short sides of the rectangle defined by the bottom 21 and a pair of second flanges extending along the long sides of the rectangle defined by the bottom 21. The flange piece 25 has an annular shape as a whole.

The plurality of flange pieces 25 are adjacent to each other without being continuous. That is, the flange pieces 25 are adjacent to each other without overlapping each other. Thereby, the adhesion between the flange piece 25 and the formed film 40 can be improved over the entire circumference of the paper container 20 . In addition, since the flange pieces 25 are adjacent to each other without overlapping each other, it is possible to suppress the occurrence of pinholes or the like in the formed film 40 when the formed film 40 is adhered to the paper container 20. there is Furthermore, since the flange pieces 25 are adjacent to each other without overlapping each other, when sealing the lid material 50 in the area corresponding to the flange piece 25 of the formed film 40 of the paper container 10, the formed film Adhesion between 40 and lid member 50 can be improved. As a result, it is possible to suppress the occurrence of sealing failure of the lid member 50 . In this specification, the term "adjacent" refers to the case where mutually adjacent members (for example, the flange pieces 25) are in contact with each other over the entire area without gaps, and the case where the following (1) or (2) applies. Also includes
(1) One member and another member are adjacent to each other in a state in which only a part of one member (eg, first flange piece 25a) is in contact with another member (eg, second flange piece 25b) to be
(2) One member (eg, first flange piece 25a) and another member (eg, second flange piece 25b) are not in contact with each other, and one member and another member are adjacent to each other In this case, at least part of the gap between the one member and the other member causes the formed film 40 (film 40a described later) to adhere to the one member and the other member. The gap must be such that it cannot be entered.

Here, as shown in FIGS. 3 and 4A , one flange piece 25 is formed with a first recess 71 , and another flange piece 25 adjacent to the one flange piece 25 is formed in the first recess 71 . A first convex portion 72 is formed to be accommodated in the . In the illustrated example, the first recess 71 is formed in the first flange piece 25a, and the first protrusion 72 is formed in the second flange piece 25b. The first concave portion 71 and the first convex portion 72 suppress the relative movement between the first flange piece 25a and the second flange piece 25b, so that the gap between the first flange piece 25a and the second flange piece 25b is reduced. , play a role in suppressing the formation of a gap extending from the outer edge 25c of the first flange piece 25a (the second flange piece 25b) to the inner edge 25d. In the following description, among the gaps between the first flange piece 25a and the second flange piece 25b, the gap extending from the outer edge 25c to the inner edge 25d of the first flange piece 25a (second flange piece 25b) is defined as It is also simply referred to as “gap G”.

On the other hand, as shown in FIG. 4B, in the case of the paper container 20A in which the first concave portion 71 and the first convex portion 72 are not formed in the flange piece 25, the first flange piece 25a (the second flange piece 25b) It may easily move away from the second flange piece 25b (first flange piece 25a). In this case, a gap G extending from the outer edge 25c of the first flange piece 25a (second flange piece 25b) to the inner edge 25d may be formed between the first flange piece 25a and the second flange piece 25b. . In this case, as will be described later, there is a possibility that a gap g2 (see FIG. 10) is formed between the molded film 40 and the lid member 50 to allow communication between the inside and the outside of the paper container 1 with the lid member. There is a possibility that the lid-attached paper container 1 cannot be sealed.

On the other hand, in the present embodiment, as described above, one flange piece 25 is formed with the first recess 71 , and the other flange piece 25 adjacent to the one flange piece 25 is formed with the first recess 71 . A first protrusion 72 is formed to be accommodated within 71 . As a result, relative movement between the first flange piece 25a and the second flange piece 25b can be suppressed, and a gap G is formed between the first flange piece 25a and the second flange piece 25b. can be suppressed.

The first recesses 71 are formed at both ends in the longitudinal direction (the vertical direction in FIG. 3) of the first flange piece 25a, and two first recesses 71 are formed in each of the first flange pieces 25a. Similarly, the first protrusions 72 are formed at the ends of the second flange piece 25b in the longitudinal direction (horizontal direction in FIG. 3), and two first protrusions 72 are formed on each of the second flange pieces 25b. formed. Also, the first concave portion 71 and the first convex portion 72 are formed at positions separated from the second fold line 24 .

In this embodiment, the first protrusion 72 is engaged with the first recess 71 . Thereby, it is possible to effectively suppress the formation of a gap G between the first flange piece 25a and the second flange piece 25b.

Further, as shown in FIG. 4A , the first recess 71 includes an enlarged portion 73 that gradually widens as the depth of the first recess 71 increases, and an enlarged portion 73 that gradually widens as the depth of the first recess 71 increases. and a reduced portion 74 of reduced width. On the other hand, the first convex portion 72 includes a widened portion 75 whose width gradually widens from the proximal end 72a side toward the distal end 72b side, and a reduced width portion whose width gradually narrows from the proximal end 72a side toward the distal end 72b side. 76. As a result, when the first flange piece 25a (second flange piece 25b) attempts to move away from the second flange piece 25b (first flange piece 25a), the enlarged portion 73 of the first concave portion 71 and the first The widened portion 75 of the convex portion 72 interferes with it. Therefore, in at least a part of the region, the first flange piece 25a and the second flange piece 25b come into contact with each other, thereby forming a gap G between the first flange piece 25a and the second flange piece 25b. is suppressed.

Furthermore, in plan view, at least part of the contour of the first recess 71 has an arc shape. Similarly, in plan view, at least part of the outline of the first convex portion 72 has an arc shape. As a result, when the first protrusion 72 is accommodated in the first recess 71, interference between the first protrusion 72 and the portion of the first flange piece 25a surrounding the first recess 71 is suppressed. This makes it easier to engage the first convex portion 72 with the first concave portion 71 .

(blank material)
Next, the blank material 30 for producing the paper container 20 will be described. As shown in FIG. 5, 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 second fold line attached to each side panel 33, respectively. a plurality of flange strip panels 35 connected via 34; 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 30 correspond to the bottom portion 21, the first fold line 22, the side portion 23 and the second fold line 24 of the paper container 20, respectively. and the flange piece 25 . In the illustrated example, the blank 30 includes four side panels 33 and four flange strip panels 35 .

A gap 36 is formed between the side panels 33 . In this case, each side panel 33 is formed in a trapezoidal shape. Each side panel 33 also has a pair of side edges 33a extending from the bottom panel 31 respectively. A gap 36 is formed between the side edges 33 a of the side panel 33 . As a result, in the paper container 10 described above, the side portions 23 do not overlap and are adjacent to each other (see FIGS. 2 and 3). In the illustrated example, the pair of side edges 33a of each side panel 33 extend away from each other from the first folding line 32 side toward the second folding line 34 side.

As described above, the flange piece panels 35 of the blank 30 correspond to the flange pieces 25 of the paper container 20 . Thus, the blank 30 includes a pair of first flange piece panels 35a extending along the short sides of the rectangle defined by the bottom panel 31 and a pair of second flange piece panels 35a extending along the long sides of the rectangle defined by the bottom panel 31. and a flange piece panel 35b.

Here, as shown in FIGS. 5 and 6, a first recess 81 is formed in one flange piece panel 35, and another flange piece panel facing one flange piece panel 35 with a gap 36 therebetween is formed. 35 is formed with a first protrusion 82 that is accommodated in the first recess 81 . In the illustrated example, the first recess 81 is formed in the first flange piece panel 35a and the first protrusion 82 is formed in the second flange piece panel 35b.

The first concave portion 81 and the first convex portion 82 correspond to the first concave portion 71 and the first convex portion 72 of the flange piece 25 of the paper container 20, respectively. Therefore, the first protrusion 82 is configured to engage with the first recess 81 . Further, as shown in FIG. 6 , the first recessed portion 81 includes an enlarged portion 83 corresponding to the enlarged portion 73 of the first recessed portion 71 of the flange piece 25 and a reduced portion 84 corresponding to the reduced portion 74 . Similarly, the first convex portion 82 has a widened portion 85 corresponding to the widened portion 75 of the first convex portion 72 of the flange piece 25 (a widened portion 85 whose width gradually widens from the proximal end 82a side toward the distal end 82b side). ) and a reduced width portion 86 corresponding to the reduced width portion 76 (a reduced width portion 86 whose width gradually narrows from the proximal end 82a side toward the distal end 82b side). Furthermore, in plan view, at least a portion of the outline of the first recess 81 has an arc shape, and at least a portion of the outline of the first projection 82 has an arc shape.

The bottom panel 31, the side panels 33 and the flange piece panels 35 of such a blank 30 are integrally formed. The blank material 30 can be produced by subjecting a paper material forming the blank material 30 to punching or the like.

Examples of paper materials that constitute the blank material 30 include various paperboards, coated papers, card papers, ivory papers, milk carton base papers, cup base papers, coated balls, etc., each having a basis weight of about 150 g/m ² or more and 800 g/m ² or less. processed paper or the like can be used.

(molding film)
Next, the molded film 40 will be described with reference to FIGS. 1 to 3. FIG. 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 content 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).

Such a molded film 40 may be a film made of a thermoplastic resin having water resistance, sealability, and heat-sealability. Examples of the molded film 40 include various types of polyethylene (PE), polypropylene (PP), polyvinyl chloride, polyethylene terephthalate (PET), ethylene-vinyl acetate copolymer, ionomer, and 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, for example, a laminate obtained by laminating a gas barrier material such as ethylene-vinyl alcohol copolymer (EVOH) as an intermediate layer, specifically PE A laminate having a layer structure such as /EVOH/PE, PP/EVOH/PE, and A (amorphous).PET/EVOH/PE can be used.

The molded film 40 may be produced, for example, from a laminate having the following layer structure.
(Outside) Polyethylene (40 μm)/Ionomer (40 μm)/Polyethylene (40 μm) (Inside)
(Outside) polypropylene (30 μm)/adhesive layer (10 μm)/ionomer (40 μm)/adhesive layer (10 μm)/polypropylene (30 μm) (inner)
(Outside) 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) ) (inside)

Each of the above layers is formed by a dry lamination method, an extrusion lamination method, an extrusion coating method or other coating method according to a conventional method.

Lid Material Next, the lid material 50 will be described. The lid member 50 is sealed over the entire periphery of the formed film 40 of the paper container 10 in the area corresponding to the flange piece 25 .

Such a lid material 50 includes layers such as, for example, a PET/sealant layer, a PP/sealant layer, a PET/PP/sealant layer, a PET/PE/sealant layer, a K-coated oriented nylon (KON)/PE/sealant layer, and the like. Laminates of construction can be used. Also, the laminate constituting the lid member 50 may be, for example, a laminate in which a gas barrier material such as ethylene-vinyl alcohol copolymer (EVOH) is laminated as an intermediate layer. For the lid member 50, for example, a laminate having a layer structure such as PET/PE/ethylene-vinyl alcohol copolymer (EVOH)/PE/sealant layer can be used. Also, an aluminum foil or a vapor deposition film (aluminum vapor deposition or transparent vapor deposition) may be used as the barrier layer. Furthermore, it is preferable to use the resin material which can express what is called easy peel property for a sealant.

The lid member 50 may be made of, for example, a laminate having the following layer structure.
(Outside) Polyethylene terephthalate film with transparent vapor deposition layer (12 μm)/Nylon film (15 μm)/Polyethylene film (40 μm) (Inside)

Each of the above layers is formed by a dry lamination method, an extrusion lamination method, an extrusion coating method or other coating method according to a conventional method.

In the lid-equipped paper container 1 having such a configuration, the contents are first filled into the paper container 10 . Next, the cover material 50 is sealed to the area corresponding to the flange piece 25 in the formed film 40 of the paper container 10 . As a result, the lid-attached paper container 1 filled with the contents is obtained. Note that the paper container 1 with a lid may be a container for chilled foods or frozen foods, or may be used as a take-out container. Also, the contents may be foods such as side dishes, meat, and dairy products.

Next, the operation of this embodiment having such a configuration will be described. Here, a method for manufacturing the paper container 10 and a method for manufacturing the lid-attached paper container 1 will be described with reference to FIGS. 7 to 11. FIG.

Paper Container Manufacturing Method First, a blank material 30 is prepared. At this time, the blank material 30 is obtained by first preparing a paper material and then subjecting the paper material to a punching process or the like.

Next, as shown in FIG. 7, the blank material 30 is attached to the cavity-side mold 60 . A suction hole 61 is formed in the cavity-side mold 60 , and the blank material 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 against the bottom panel 31 along the first folding line 32 . Similarly, flange strip panel 35 of blank 30 is folded against side panel 33 along second fold line 34 . Also, at this time, the first convex portion 82 formed on the second flange piece panel 35b is accommodated in the first concave portion 81 formed on the first flange piece panel 35a. As a result, the paper container 20 attached to the cavity side mold 60 is obtained.

Next, the formed film 40 is laminated on the surface of the paper container 20 . At this time, first, as shown in FIG. 8, the film 40a constituting the molded film 40 is arranged above the paper container 20. Then, as shown in FIG. Next, the film 40a is heated by the core side mold 62 (see FIG. 9). After the film 40 a is sufficiently heated by the core side mold 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. Also, at this time, the core-side mold 62 presses the film 40 a against the paper container 20 . As a result, the film 40a adheres to the paper container 20. As shown in FIG.

After that, the film 40a is cut into a desired shape by a cutting mechanism 63 provided on the core side die 62 . Thereby, as shown in FIG. 9, the molded film 40 laminated on the paper container 20 is obtained. Thus, the paper container 10 is obtained.

By the way, in the paper container 20, the first convex portion 72 formed on the second flange piece 25b is accommodated in the first concave portion 71 formed on the first flange piece 25a. As a result, relative movement of the first flange piece 25a with respect to the second flange piece 25b (relative movement of the second flange piece 25b with respect to the first flange piece 25a) is suppressed. Therefore, a gap (that is, gap G) extending from the outer edge 25c of the first flange piece 25a (second flange piece 25b) to the inner edge 25d is formed between the first flange piece 25a and the second flange piece 25b. is suppressed.

Here, when a gap g1 is formed between the first flange piece 25a and the second flange piece 25b as shown in FIG. A depression 40b may be formed. When the depression 40b is formed on the surface of the film 40a in this way, a gap g2 may be formed between the molded film 40 obtained from the film 40a and the lid member 50 in some cases. Then, when the gap g1 between the first flange piece 25a and the second flange piece 25b extends from the outer edge 25c of the first flange piece 25a (second flange piece 25b) to the inner edge 25d (that is, the gap g1 is the gap G), the gap g2 between the molded film 40 and the lid member 50 causes the inside and outside of the lid-equipped paper container 1 to communicate, and the lid-equipped paper container 1 is sealed. become unable.

In contrast, in the present embodiment, as described above, formation of the gap G between the first flange piece 25a and the second flange piece 25b is suppressed. In this case, the first flange piece 25a and the second flange piece 25b come into contact with each other in at least a partial area. Since the first flange piece 25a and the second flange piece 25b are in contact with each other, as shown in FIG. surface can be flattened. Therefore, as will be described later, it is possible to suppress the formation of the aforementioned gap g2 between the molded film 40 and the lid member 50 .

Next, a method for manufacturing the lid-equipped paper container 1 will be described.

First, in parallel with manufacturing the paper container 10, the lid member 50 is prepared. At this time, a predetermined laminate is produced by a dry lamination method or the like. After that, the lid member 50 is manufactured by punching out the laminate into a predetermined shape with a knife or the like.

Next, the paper container 10 is filled with contents, and the paper container 10 is sealed with the lid member 50 . At this time, first, the paper container 10 is filled with contents (not shown). Next, the lid member 50 is placed on the molded film 40 at a position corresponding to the flange piece 25 .

Next, the lid member 50 is sealed to the forming film 40 by a hot sealing plate or the like (not shown). At this time, the air in the paper container 10 may be replaced with, for example, nitrogen gas.

Here, as described above, the surface of the molded film 40 is flat (see FIG. 11). As a result, the formation of a gap g2 (see FIG. 10) between the molded film 40 and the lid member 50 can be suppressed, and the paper container 1 with the lid member is hermetically sealed.

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

As described above, according to the present embodiment, the first concave portion 71 is formed in the first flange piece 25a (one flange piece 25), and the second flange piece 25b ( The other flange piece 25) is formed with a first protrusion 72 that is accommodated in the first recess 71 . Thereby, it is possible to suppress the formation of a gap G between the first flange piece 25a and the second flange piece 25b. Therefore, it is possible to improve the airtightness of the lid-equipped paper container 1 . Thus, by improving the sealing performance of the paper container 1 with lid material, the barrier property of the paper container 1 with lid material can be improved, and the life of the contents can be extended. As a result, food loss can also be reduced.

Moreover, according to the present embodiment, the first protrusion 72 is engaged with the first recess 71 . Thereby, it is possible to more effectively suppress the formation of the gap G between the first flange piece 25a and the second flange piece 25b.

Further, according to the present embodiment, the first convex portion 72 includes the widened portion 75 whose width gradually widens from the proximal end 72a side toward the distal end 72b side. Accordingly, when the first flange piece 25a or the second flange piece 25b attempts to move away from the second flange piece 25b or the first flange piece 25a, the widened portion 75 of the first convex portion 72 moves toward the first concave portion. Interfere with 71. Thereby, it is possible to more effectively suppress the formation of the gap G between the first flange piece 25a and the second flange piece 25b.

Furthermore, according to the present embodiment, at least a part of the outline of the first convex portion 72 has an arc shape in plan view. As a result, when the first protrusion 72 is accommodated in the first recess 71, interference between the first protrusion 72 and the portion of the first flange piece 25a surrounding the first recess 71 is suppressed. This makes it easier to engage the first convex portion 72 with the first concave portion 71 .

Modifications Modifications of the paper container 10 and blank material 30 according to the present embodiment will now be described with reference to FIGS. 12 to 27. FIG. 12 to 27, the same parts as in the embodiment shown in FIGS. 1 to 11 are denoted by the same reference numerals, and detailed description thereof will be omitted.

(First modification)
In the embodiment described above, an example was described in which at least part of the contours of the first concave portions 71, 81 and the first convex portions 72, 82 each had an arc shape in plan view, but the present invention is not limited to this. For example, as shown in FIG. 12 or 13, the first concave portions 71, 81 and the first convex portions 72, 82 may be trapezoidal. In this case, the first concave portions 71 and 81 may include only the enlarged portions 73 and 83 without including the reduced portions 74 and 84 described above. Similarly, the first convex portions 72, 82 may include only the widened portions 75, 85 without including the narrowed portions 76, 86 described above. In this case also, when the first flange piece 25a or the second flange piece 25b attempts to move away from the second flange piece 25b or the first flange piece 25a, the widened portion 75 of the first convex portion 72 1 recess 71. Thereby, it is possible to more effectively suppress the formation of the gap G between the first flange piece 25a and the second flange piece 25b.

(Second modification)
In the embodiment described above, an example in which the first recesses 71, 81 and the first protrusions 72, 82 are formed at positions separated from the second fold lines 24, 34 has been described, but the present invention is not limited to this. . For example, as shown in FIG. 14 or 15, the first concave portions 71, 81 and the second polygonal lines 24, 34 may be connected to each other. Similarly, the first protrusions 72, 82 and the second fold lines 24, 34 may be connected to each other. In this case, the first concave portions 71, 81 and the first convex portions 72, 82 can be brought closer to the side portions 23, and relative movement between the side portions 23 can be suppressed. Therefore, relative movement between the first flange piece 25a and the second flange piece 25b can be more effectively suppressed, and a gap G is formed between the first flange piece 25a and the second flange piece 25b. can be suppressed more effectively.

(Third modification)
In the above-described embodiment, the first concave portions 71 and 81 include the enlarged portions 73 and 83, and the first convex portions 72 and 82 include the widened portions 75 and 85. However, the present invention is not limited to this. . For example, as shown in FIG. 16 or FIG. 17, the first protrusions 72 and 82 are provided closer to the tip ends 72b and 82b than the narrow width portions 77 and 87 and the narrow width portions 77 and 87. , 87 and wider portions 78 , 88 . In this case, the first concave portions 71 and 81 may include protruding portions 79 and 89 corresponding to the narrow width portions 77 and 87 of the first convex portions 72 and 82 .

In this modification, when the first flange piece 25a or the second flange piece 25b attempts to move away from the second flange piece 25b or the first flange piece 25a, the wide portion 78 of the first convex portion 72 1 interferes with the protrusion 79 of the recess 71 . Also in this case, it is possible to more effectively suppress the formation of the gap G between the first flange piece 25a and the second flange piece 25b.

(Fourth modification)
In the above-described embodiment, the first concave portions 71 and 81 include the enlarged portions 73 and 83, and the first convex portions 72 and 82 include the widened portions 75 and 85. However, the present invention is not limited to this. . For example, as shown in FIG. 18 or 19, the first concave portions 71, 81 and the first convex portions 72, 82 may each be formed in a rectangular shape in plan view. Further, for example, as shown in FIG. 20 or 21, the first concave portions 71, 81 and the first convex portions 72, 82 may each be formed in a semicircular shape in plan view. Furthermore, as shown in FIG. 22 or 23, the first concave portions 71, 81 and the first convex portions 72, 82 may each be formed in a triangular shape in plan view. In this modification, when the first protrusion 72 is accommodated in the first recess 71, the first protrusion 72 and the portion of the first flange piece 25a around the first recess 71 interfere with each other. can be suppressed more effectively, and the engagement of the first convex portion 72 with the first concave portion 71 can be facilitated. Also in this modification, it is possible to suppress the formation of a gap G between the first flange piece 25a and the second flange piece 25b, thereby improving the airtightness of the lid-equipped paper container 1 .

(Fifth modification)
In the above-described embodiment, one flange piece 25 (first flange piece 25a) is formed with the first concave portion 71, and the other flange piece 25 (second flange piece 25b) adjacent to the one flange piece 25 is formed. ), in which the first convex portion 72 accommodated in the first concave portion 71 is formed. In addition, a first recess 81 is formed in one flange piece panel 35 (first flange piece panel 35a), and another flange piece panel 35 (second An example in which the first convex portion 82 accommodated in the first concave portion 81 is formed on the two-flange piece panel 35b) has been described. In this case, as shown in FIG. 24, a second recess 710 is formed in the other flange piece 25 (second flange piece 25b), and a second recess 710 is formed in one flange piece 25 (first flange piece 25a). A second protrusion 720 that is accommodated within the recess 710 may be formed. Further, as shown in FIG. 25, a second recess 810 is formed in the other flange piece panel 35 (second flange piece panel 35b), and one flange piece panel 35 (first flange piece panel 35a) has a , a second protrusion 820 that is accommodated in the second recess 810 may be formed.

In this modification, a second recess 710 (second recess 810) is formed in the second flange piece 25b (second flange piece panel 35b), and the first flange piece 25a (first flange piece panel 35a) , a second convex portion 720 (second convex portion 820) is formed. This makes it easier to bring the first flange piece 25a and the second flange piece 25b into contact with each other. Therefore, it is possible to effectively suppress the formation of a gap G between the first flange piece 25a and the second flange piece 25b.

(Sixth modification)
In the fifth modification described above, a second recess 710 (second recess 810) is formed in the second flange piece 25b (second flange piece panel 35b), and the first flange piece 25a (first flange piece panel 35a) has been described with the second protrusion 720 (the second protrusion 820). In this case, as shown in FIG. 26, a plurality of first concave portions 71 and a plurality of second convex portions 720 are formed on one flange piece 25 (first flange piece 25a), and the other flange piece 25 ( A plurality of first protrusions 72 and a plurality of second recesses 710 may be formed on the second flange piece 25b). In the illustrated example, two first concave portions 71 and two second convex portions 720 are formed on the first flange piece 25a, and two first convex portions 72 and two second convex portions 720 are formed on the second flange piece 25b. Two recesses 710 are formed two each.

Further, as shown in FIG. 27, a plurality of first concave portions 81 and second convex portions 820 are formed in one flange piece panel 35 (first flange piece panel 35a), and the other flange piece panels A plurality of first protrusions 82 and a plurality of second recesses 810 may be formed on 35 (second flange piece panel 35b). In the illustrated example, two first concave portions 81 and two second convex portions 820 are formed on the first flange piece panel 35a, and two first convex portions 82 are formed on the second flange piece panel 35b. , and two second recesses 810 are formed.

In this modification, a plurality of first recesses 71 (first recesses 81) and second protrusions 720 (second protrusions 820) are provided on the first flange piece 25a (first flange piece panel 35a). A plurality of first protrusions 72 (first protrusions 82) and second recesses 710 (second recesses 810) are formed on the second flange piece 25b (second flange piece panel 35b). ing. This makes it easier to bring the first flange piece 25a and the second flange piece 25b into contact with each other. Therefore, it is possible to more effectively suppress the formation of the gap G between the first flange piece 25a and the second flange piece 25b.

Next, specific examples in the above embodiment will be described.

(Example 1)
(1) Formability evaluation First, the formability evaluation of the paper container 20 was performed. At this time, first, a blank material 30 shown in FIG. 5 was produced. In this case, a paper material (manufactured by Mitsubishi Paper Mills, N-Pearl Card (product name)) was prepared as a material for the paper container 20 . At this time, two types of paper materials having basis weights of 260 g/m ² and 450 g/m ² were prepared. A paper material (New Pigeon (product name) manufactured by Oji Materia Co., Ltd.) was prepared as a material for the paper container 20 . At this time, the basis weight was 550 g/m ² . Then, each paper material was punched into a predetermined shape to produce a blank material 30 .

Next, the paper container 20 was manufactured by mounting the obtained blank material 30 on the cavity side mold 60 and assembling them. Then, the moldability of the assembled paper container 20 was evaluated.

(2) Sealability Evaluation Test Next, a sealability evaluation test was conducted. At this time, first, a film (thickness: 120 μm) having the following layer structure was prepared as the molded film 40 .
PE (40 μm)/Ionomer (40 μm)/PE (40 μm)
Next, a paper container 10 was produced by laminating a film on the surface of the paper container 20 using a paper material having a basis weight of 260 g/m ² .

Next, the paper container 10 was filled with a test liquid (manufactured by Mitsubishi Gas Chemical, Ageless Seal Check (product name)).

Also, as the cover material 50, a laminated film was prepared. At this time, a polyethylene terephthalate film (manufactured by DNP Technopack Co., Ltd., IB-PET-UB, thickness 12 μm) with a transparent deposition layer, a nylon film (thickness 15 μm), and a polyethylene film (thickness 40 μm) are laminated by a dry lamination method. By doing so, a laminated film was produced.

Then, by sealing the paper container 10 with the laminated film, the paper container 1 with a lid member was produced.

After that, the lid-equipped paper container 1 was stored for one day with the lid 50 facing down, and then whether or not the lid-equipped paper container 1 was leaking liquid was checked.

(Example 2)
Formability evaluation and sealing evaluation tests were conducted in the same manner as in Example 1, except that a blank material 30 shown in FIG. 13 was produced.

(Example 3)
Formability evaluation and sealing evaluation tests were performed in the same manner as in Example 1, except that a blank material 30 shown in FIG. 15 was produced.

(Example 4)
Formability evaluation and sealing evaluation tests were performed in the same manner as in Example 1, except that a blank material 30 shown in FIG. 19 was produced.

(Example 5)
Formability evaluation and sealability evaluation tests were performed in the same manner as in Example 1, except that a blank material 30 shown in FIG. 21 was produced.

(Example 6)
Formability evaluation and sealing evaluation tests were conducted in the same manner as in Example 1, except that a blank material 30 shown in FIG. 23 was produced.

(Example 7)
Formability evaluation and sealing evaluation tests were conducted in the same manner as in Example 1, except that a blank material 30 shown in FIG. 25 was produced.

(Example 8)
Formability evaluation and sealing evaluation tests were performed in the same manner as in Example 1, except that a blank material 30 shown in FIG. 27 was produced.

(Comparative example 1)
As shown in FIG. 28 , the flange piece panel 35 (the first flange piece panel 35 a, the second flange piece panel Formability evaluation and sealing evaluation tests were performed in the same manner as in Example 1, except that a blank material 30A provided with 35b) was produced.

Table 1 shows the above results.

In the column of moldability evaluation in Table 1 above, "⊚" indicates the case where the paper container 20 was removed from the cavity-side mold 60 by firmly engaging the first convex portion 72 with the first concave portion 71. also means that the gap G was not formed between the first flange piece 25a and the second flange piece 25b. Also, "◯" indicates that when the paper container 20 was removed from the cavity side mold 60, a gap G was formed between the first flange piece 25a and the second flange piece 25b, but the cavity side mold 60 This means that the gap G was not formed between the first flange piece 25a and the second flange piece 25b in the paper container 20 in the attached state. Further, "Δ" indicates that the first flange panel 35a and the second flange panel 35b of the blank 30A move away from each other even when the blank 30A is attached to the cavity side mold 60. Finally, it means that a gap extending from the outer edge to the inner edge of the first flange piece panel 35a (second flange piece panel 35b) is formed between the first flange piece panel 35a and the second flange piece panel 35b. do.

In addition, in the column of the sealability evaluation test in Table 1 above, "○" means that the lid-attached paper container 1 did not leak liquid. In addition, "△" indicates that liquid leakage did not occur in the paper container with the lid only by turning it over so that the lid was down. It means that liquid leakage occurred in the lidded paper container after being stored for one day in a closed state.

As a result, as shown in Table 1, in the formability evaluation, in the paper container according to Comparative Example 1, even when the blank material 30A was attached to the cavity side mold 60, the first flange piece panel 35a of the blank material 30A and the second flange piece panel 35b move away from each other, and between the first flange piece panel 35a and the second flange piece panel 35b, the first flange piece panel 35a (the second flange piece panel 35b) A gap extending from the outer edge to the inner edge was formed.

In contrast, in the paper containers 20 according to Examples 1 to 8, the formation of the gap G between the first flange piece 25a and the second flange piece 25b could be suppressed. In particular, in the paper container 20 according to Examples 1 to 3, even when the paper container 20 is removed from the cavity-side mold 60, the shape of the paper container 20 can be maintained. It was possible to suppress the formation of the gap G between the second flange piece 25b. Therefore, it was found that the paper container 20 according to the present embodiment can improve the airtightness of the lid-equipped paper container 1 .

Further, as shown in Table 1, in the sealability evaluation test, the paper container with lid according to Comparative Example 1 was not sealed, and liquid leaked from the paper container with lid. was occurring.

On the other hand, in the paper containers 1 with lids according to Examples 1 to 8, the paper containers 1 with lids could be sealed, and liquid leakage did not occur in the paper containers 1 with lid. rice field. Therefore, it was found that the paper container 1 with lid according to the present embodiment can improve the sealing performance.

The present disclosure is not limited to the above-described embodiment and modifications as they are, and can be embodied by modifying constituent elements without departing from the gist of the present disclosure at the implementation stage. Also, various inventions can be formed by appropriate combinations of the plurality of constituent elements disclosed in the above embodiment and modifications. Some components may be deleted from all the components shown in the embodiment and each modification.

1 paper container with lid 10 paper container 20 paper container 21 bottom 22 first fold line 23 side portion 24 second fold line 25 flange piece 30 blank material 31 bottom panel 32 first fold line 33 side panel 34 second fold line 35 flange One panel 35a First flange piece panel 35b Second flange piece panel 40 Forming film 50 Lid material 71 First concave portion 72 First convex portion 72a Base end 72b Tip end 75 Widened portion 77 Narrow portion 78 Wide portion 710 Second concave portion 720 Second 2 convex portion 81 first concave portion 82 first convex portion 82a base end 82b tip end 85 widened portion 87 narrow portion 88 wide portion 810 second concave portion 820 second convex portion

Claims (16)

a bottom panel;
a plurality of side panels connected to the bottom panel via a first fold line;
a plurality of flange strip panels each connected to each side panel via a second fold line;
a gap is formed between the side panels;
A first recess is formed in one flange piece panel,
A blank member, wherein a first projection that is accommodated in the first recess is formed on another flange piece panel that faces the one flange piece panel through the gap. 2. The blank according to claim 1, wherein said first protrusion engages said first recess. The blank material according to claim 1 or 2, wherein the first convex portion includes at least a widened portion whose width gradually widens from the base end side toward the tip end side. The blank material according to claim 1 or 2, wherein the first convex portion includes a narrow portion and a wide portion provided on the tip side of the narrow portion and wider than the narrow portion. 5. The blank according to any one of claims 1 to 4, wherein at least part of the outline of said first projection has an arc shape in plan view. The blank material according to any one of claims 1 to 5, wherein the first convex portion and the second polygonal line are connected to each other. 7. The method according to any one of claims 1 to 6, wherein the other flange piece panel is formed with a second concave portion, and the one flange piece panel is formed with a second convex portion that is accommodated in the second concave portion. A blank according to any one of the preceding claims. A paper container produced by assembling the blank material according to any one of claims 1 to 7;
and a formed film laminated on the surface of the paper container. A paper container having a bottom portion, a plurality of side portions connected to the bottom portion via a first fold line, and a plurality of flange pieces connected to each side portion via a second fold line, respectively;
A formed film laminated on the surface of the paper container,
The side portions are adjacent to each other without being continuous,
A first recess is formed in one flange piece,
A paper container, wherein another flange piece adjacent to the one flange piece is formed with a first protrusion that is accommodated in the first recess. 10. The paper container according to claim 9, wherein said first protrusion engages said first recess. The paper-made container according to claim 9 or 10, wherein the first convex portion includes at least a widened portion whose width gradually widens from the base end side toward the tip end side. 11. The paper container according to claim 9 or 10, wherein the first convex portion includes a narrow portion and a wide portion provided on the tip side of the narrow portion and wider than the narrow portion. . 13. The paper container according to any one of claims 9 to 12, wherein at least part of the outline of said first convex portion has an arc shape in plan view. The paper container according to any one of claims 9 to 13, wherein the first protrusion and the second fold line are connected to each other. 15. Any one of claims 9 to 14, wherein the other flange piece is formed with a second recess, and the one flange piece is formed with a second protrusion that is accommodated in the second recess. The paper container according to item 1. The paper container according to any one of claims 8 to 15;
A paper container with a lid, comprising a lid that seals the paper container.

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