JP2023051025A - Blank material, paper container and paper container with lid material - Google Patents

Abstract

To provide blank material which enables improvement of the strength of a paper container l, a paper container and a paper container with lid material.SOLUTION: Blank material 30 comprises: a bottom panel 31; a plurality of side panels 33; and a plurality of flange piece panels 35. A gap 36 is formed between the side panels 33. A first recess 81 is formed on a side edge 33c of the one side panel 33. A first protrusion 82 housed in the first recess 81 is formed on a side edge 33c of the other side panel 33 which is opposed via the gap 36 to the one side panel 33. The first recess 81 is formed over the entire region of the side edge 33c of the one side panel 33. The first protrusion 82 is formed over the entire region of the side edge 33c of the other side panel 33.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 the food is filled, the paper container is covered with a cover material.

Japanese translation of PCT publication No. 2013-545675

However, such a paper container is produced by assembling blank materials. Therefore, the strength of the paper container may be reduced. Therefore, it is desired to improve the strength of paper containers.

The present disclosure has been made in consideration of such points, and aims to provide a blank material, a paper container, and a paper container with a lid that can improve the strength of the paper container. do.

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 flange piece panel with a gap formed between the side panels; a first recess formed in a side edge of the one side panel; A first protrusion that is accommodated in the first recess is formed on a side edge of the other side panel that faces the other side panel with a gap therebetween. Formed over the entire side edge, the first projection is a blank formed over the entire side edge of the other side panel.

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. and a flange piece panel, a gap is formed between the side panels, a first concave and convex portion including a first concave portion is formed on a side edge of one side panel, and the one A second concave/convex portion including a first convex portion accommodated in the first concave portion is formed on a side edge of the other side panel facing the side panel of the second through the gap, and the first The concave-convex portion includes a second convex portion, the second convex portion includes a second concave portion in which the second convex portion is received, and the first concave-convex portion extends from the side of the one of the side panels. Formed over an edge, said second indentation being a blank formed over said side edge of said other said side panel.

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

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 the side edge of one side portion is formed, and the side edge of the other side portion adjacent to the one side portion is formed with a first convex portion that is accommodated in the first concave portion, and the first concave portion is formed over the entire side edge of the side portion of the paper container, and the first convex portion is formed over the entire side edge of the other side portion.

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 the side edge of one side portion is formed, and a second uneven portion including the first protrusion accommodated in the first recess is formed on the side edge of the other side portion adjacent to the one side portion , the first uneven portion includes a second convex portion, the second uneven portion includes a second concave portion in which the second convex portion is accommodated, and the first uneven portion includes the one The paper container is formed over the entire side edge of the side portion, and the second uneven portion is formed over the entire side edge of the other side portion.

In the paper container according to one embodiment, at least a part of the outline of the first convex portion may have an arc shape in a side view.

In the paper container according to one embodiment, at least a part of the outline of the first protrusion may have a linear shape in a side view.

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 strength of the paper container.

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 a side view (viewed from the IVA direction in FIG. 2) showing the paper container according to the present embodiment. FIG. 4B is a side view (viewed from the direction IVB in FIG. 2) showing the paper container of the paper container according to the present embodiment. FIG. 4C is a side view (a view corresponding to FIG. 4A) showing a comparative example 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 side view (a view corresponding to FIG. 4B) showing a first modification of the paper container of the paper container according to the present embodiment. FIG. 11 is a plan view showing a first modification of the blank according to this embodiment. FIG. 12 is a side 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. 13 is a plan view showing a second modification of the blank according to this embodiment. FIG. 14 is a perspective view showing a third modification of the paper container of the paper container according to the present embodiment. FIG. 15 is a plan view showing a third modification of the blank according to this embodiment. FIG. 16 is a perspective view showing another example of the third modification of the paper container of the paper container according to the present embodiment. FIG. 17 is a plan view showing another example of the third modification of the blank according to this embodiment. FIG. 18 is a diagram explaining a strength measurement test according to an example. FIG. 19 is a plan view showing a blank material of Comparative Example 1 in Examples. FIG. 20 is a plan view showing a blank material of Comparative Example 2 in the example.

Hereinafter, this embodiment will be described with reference to the drawings. 1 to 9 are diagrams showing this embodiment. Each figure shown below is a figure shown typically. Therefore, the size and shape of each part are appropriately exaggerated for easy understanding. In addition, it can be modified 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, are interpreted to include substantially the same state in addition to strictly meaning. 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 . Among these, the paper container 20 is a container 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 carton 20 has four sides 23 . Specifically, the paper container 20 includes a pair of first side portions 23a extending along the short sides of the rectangle defined by the bottom portion 21 and a pair of second side portions extending along the long sides of the rectangle defined by the bottom portion 21. The side portion 23 is formed in an inverted truncated quadrangular pyramid shape 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 adhesion 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 pinholes or the like in the formed film 40 when the formed film 40 is adhered to the paper container 20 . 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 formation of pinholes or the like in the formed film 40 when the formed film 40 is adhered to the paper container 20 . 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. Thereby, 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.

By the way, as shown in FIGS. 3 to 4B, a first recess 71 is formed in the side edge 23c of the one side portion 23. As shown in FIGS. A first protrusion 72 that is housed in the first recess 71 is formed on the side edge 23 c of the other side portion 23 adjacent to the one side portion 23 . In other words, the side edge 23c of the one side portion 23 is formed with the first uneven portion 70A including the first concave portion 71. As shown in FIG. A second uneven portion 70</b>B including a first convex portion 72 accommodated in the first concave portion 71 is formed on the side edge 23 c of the other side portion 23 adjacent to the one side portion 23 . The first convex portion 72 of the second concave-convex portion 70B is bent toward the one side portion 23 so as to be accommodated in the first concave portion 71 of the first concave-convex portion 70A.

In the illustrated example, the first uneven portion 70A is formed on the first side portion 23a, and the second uneven portion 70B is formed on the second side portion 23b. In this case, the first concave-convex portion 70A is formed on both side edges (both edges in the longitudinal direction (vertical direction in FIG. 3)) 23c of the first side portion 23a. A first uneven portion 70A is formed. Similarly, the second concave and convex portions 70B are formed on both side edges (both edges in the longitudinal direction (horizontal direction in FIG. 3)) 23c of the second side portion 23b. A second uneven portion 70B is formed. The first convex portion 72 of the second concave-convex portion 70B is bent toward the first side portion 23a so as to be accommodated in the first concave portion 71 of the first concave-convex portion 70A. Although not shown, the first uneven portion 70A including the first concave portion 71 may be formed on the second side portion 23b, and the second uneven portion 70B including the first convex portion 72 may be formed on the first side portion 23a. may be formed in

In the present embodiment, the first concave portion 71 of the first uneven portion 70A is formed over the entire side edge 23c of the first side portion 23a. Similarly, the first convex portion 72 of the second uneven portion 70B is formed over the entire side edge 23c of the second side portion 23b.

The first concave-convex portion 70A and the second concave-convex portion 70B serve to increase the strength of the paper container 10 . That is, when the first convex portion 72 of the second concave-convex portion 70B is accommodated in the first concave portion 71 of the first concave-convex portion 70A, a force along the vertical direction is applied to the paper container 10. In addition, deformation of the side portion 23 can be suppressed.

Here, as shown in FIG. 4C, in the paper container 10A provided with the paper container 20A in which the first uneven portion 70A and the second uneven portion 70B are not formed on the side portion 23, the vertical direction of the paper container 10A is When a force F (hereinafter simply referred to as force F) is applied, the side portion 23 may be easily crushed. Further, when the side portion 23 is crushed or deformed, the side edges 23c of the side portions 23 adjacent to each other may separate from each other. In this case, the molded film 40 may be exposed to the outside from between the side edges 23c of the side portions 23 adjacent to each other.

On the other hand, in the present embodiment, the first uneven portion 70A including the first concave portion 71 is formed in the side edge 23c of the one side portion 23 as described above. A second concave-convex portion 70</b>B including a first convex portion 72 accommodated in the first concave portion 71 is formed on the side edge 23 c of the other side portion 23 . In this case, when the side portion 23 attempts to deform due to the force F being applied to the paper container 10, the first concave portion 71 of the first concave-convex portion 70A and the first convex portion of the second concave-convex portion 70B 72 interfere with each other. Thereby, deformation of the side portion 23 can be suppressed.

Further, in this case, even if a gap is formed between the side edges 23c of the side portions 23 adjacent to each other due to the first convex portion 72 being accommodated in the first concave portion 71, the gap will not be formed. Of these, for example, the length of the portion extending straight in the vertical direction can be shortened. That is, the shape of the gap can be made complicated. Therefore, when the paper container 10 is transported or the like, it is possible to prevent surrounding structures from coming into contact with the formed film 40 from the outside. Here, in the vicinity of the side edge 23c of the side portion 23, there is a possibility that the formed film 40 will become thinner than other portions due to the stretching of the film 40a, which will be described later, which constitutes the formed film 40. FIG. As described above, even if the formed film 40 is thinner than other portions, in the present embodiment, it is possible to prevent surrounding structures from coming into contact with the formed film 40 from the outside. , the thinned molded film 40 can be suppressed from tearing.

Moreover, in a side view, at least part of the contour of the first recess 71 has an arc shape. Similarly, in a side view, at least part of the contour of the first convex portion 72 has an arc shape. Accordingly, when the first protrusion 72 is accommodated in the first recess 71, the first protrusion 72 formed on the second side portion 23b can be prevented from interfering with the first side portion 23a. 1 convex portion 72 can be easily accommodated in first concave portion 71 .

The recess amount D1 (see FIG. 4B) of the first recess 71 is 5% or more of the length L1 (see FIG. 3) of the side portion 23 (here, the first side portion 23a) on which the first uneven portion 70A is formed. It may be 30% or less. Here, as shown in FIG. 4B, the recess amount D1 is obtained when the straight line connecting the intersection of the first recess 71 and the first polygonal line 22 and the intersection of the first recess 71 and the second polygonal line 24 is X1. Second, the amount of recession in the direction perpendicular to the straight line X1. In addition, the length L1 of the side portion 23 is the length of the first fold line 22 connecting the side portion 23 (here, the first side portion 23a) on which the first uneven portion 70A is formed and the bottom portion 21. . Also, the protrusion amount P1 (see FIG. 4B) of the first convex portion 72 is the length L2 (see FIG. 3) of the side portion 23 (here, the second side portion 23b) on which the second uneven portion 70B is formed. It may be 5% or more and 30% or less. Here, the amount of protrusion P1 is the amount of protrusion in the direction perpendicular to the straight line X1. The length L2 of the side portion 23 is the length of the first fold line 22 connecting the side portion 23 (here, the second side portion 23b) on which the second uneven portion 70B is formed and the bottom portion 21. .

(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 . Each side panel 33 also has a pair of side edges 33c extending from the bottom panel 31 respectively. A gap 36 is formed between the side edges 33 c 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).

As mentioned above, the side panels 33 of the blank 30 correspond to the sides 23 of the carton 20 . Thus, the blank 30 includes a pair of first side panels 33a extending along the short sides of the rectangle defined by the bottom panel 31 and a pair of second side panels 33a extending along the long sides of the rectangle defined by the bottom panel 31. and a side panel 33b.

Further, as described above, the flange piece panel 35 of the blank material 30 corresponds to the flange piece 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 the side edge 33c of the one side panel 33. As shown in FIG. A first protrusion 82 that is housed in the first recess 81 is formed on the side edge 33 c of the other side panel 33 adjacent to the one side panel 33 . In other words, the side edge 33c of the one side panel 33 is formed with the first uneven portion 80A including the first concave portion 81. As shown in FIG. Further, a second concave-convex portion 80B including a first convex portion 82 accommodated in the first concave portion 81 is provided on the side edge 33c of the other side panel 33 facing the one side panel 33 with the gap 36 interposed therebetween. is formed.

In the illustrated example, a first indentation 80A is formed in the first side panel 33a and a second indentation 80B is formed in the second side panel 33b. In this case, the first uneven portions 80A are formed on both side edges (both edges in the longitudinal direction (the vertical direction in FIG. 5)) 33c of the first side panel 33a. Two first uneven portions 80A are formed. Similarly, the second uneven portions 80B are formed on both side edges (both edges in the longitudinal direction (horizontal direction in FIG. 5)) 33c of the second side panel 33b. Two second uneven portions 80B are formed.

Further, the first uneven portion 80A is formed over the entire side edge 33c of the first side panel 33a. Similarly, the second uneven portion 80B is formed over the entire side edge 33c of the second side panel 33b.

The first uneven portion 80A and the second uneven portion 80B correspond to the first uneven portion 70A and the second uneven portion 70B of the paper container 20, respectively. That is, 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 paper container 20, respectively. Therefore, in plan view, at least part of the outline of the first recess 81 has an arc shape, and at least part of the outline of the first projection 82 has an arc shape.

Further, the recess amount D2 (see FIG. 6) of the first recess 81 is the length L3 (see FIG. 5) of the side panel 33 (here, the first side panel 33a) on which the first uneven portion 80A is formed. may be 5% or more and 30% or less. Here, as shown in FIG. 6, the amount of recession D2 is obtained when a straight line connecting the intersection of the first recess 81 and the first polygonal line 32 and the intersection of the first recess 81 and the second polygonal line 34 is X2. Second, the amount of recession in the direction perpendicular to the straight line X2. In addition, the length L3 of the side panel 33 is the length of the first fold line 32 connecting the side panel 33 (here, the first side panel 33a) on which the first uneven portion 80A is formed and the bottom panel 31. length. Moreover, the protrusion amount P2 (see FIG. 6) of the first convex portion 82 is the length L4 (see FIG. 5) of the side panel 33 (here, the second side panel 33b) on which the second uneven portion 80B is formed. ) may be 5% or more and 30% or less. Here, as shown in FIG. 6, the amount of protrusion P2 is determined by defining a straight line that connects the intersection of the first projection 82 and the first polygonal line 32 and the intersection of the first projection 82 and the second polygonal line 34 as X3. It is the amount of protrusion in the direction orthogonal to the straight line X3 when In addition, the length L4 of the side panel 33 is the length of the first fold line 32 connecting the side panel 33 (here, the second side panel 33b) on which the second uneven portion 80B is formed and the bottom panel 31. It is.

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 the paper material that constitutes the blank material 30 include various types of paperboard, coated paper, card paper, ivory paper, milk carton base paper, cup base paper, coated board, 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.

(molded film)
Next, the molded film 40 will be described with reference to FIGS. 1 to 4B. 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, ethylene-vinyl acetate copolymer saponified product, 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. Note that "/" means a boundary between adjacent layers.

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 can 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 9. 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 projection 82 of the second uneven portion 80B formed on the second side panel 33b fits into the first recess 81 of the first uneven portion 80A formed on the first side panel 33a. be accommodated. 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.

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.

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 recess 71 is formed in the side edge 23c of the first side portion 23a (one side portion 23), and the second concave portion 71 adjacent to the first side portion 23a is formed. The side edge 23c of the side portion 23b (the other side portion 23) is formed with a first protrusion 72 that is accommodated in the first recess 71. As shown in FIG. Further, the first concave portion 71 is formed over the entire side edge 23c of the first side portion 23a, and the first convex portion 72 is formed over the entire side edge 23c of the second side portion 23b. Accordingly, when the side portion 23 attempts to deform due to the force F being applied to the paper container 10, the first concave portion 71 and the first convex portion 72 interfere with each other. Therefore, deformation of the side portion 23 can be suppressed. In particular, since the first concave portion 71 and the first convex portion 72 are formed over the entire side edge 23c of the side portion 23, deformation of the side portion 23 can be effectively suppressed. As a result, the strength of the paper container 10 can be improved.

In addition, since the first convex portion 72 is accommodated in the first concave portion 71, the shape of the gap that can be formed between the side edges 23c can be made complicated. As a result, when the paper container 10 is transported, it is possible to prevent surrounding structures from coming into contact with the formed film 40 from the outside. Therefore, the molded film 40 can be protected by the first protrusions 72 .

Further, according to the present embodiment, at least part of the outline of the first convex portion 72 has an arc shape in a side view. Accordingly, when the first protrusion 72 is accommodated in the first recess 71, the first protrusion 72 formed on the second side portion 23b can be prevented from interfering with the first side portion 23a. 1 convex portion 72 can be easily accommodated in first concave portion 71 .

Modifications Modifications of the paper container 10 and the blank 30 according to the present embodiment will now be described with reference to FIGS. 10 to 17. FIG. In FIGS. 10 to 17, the same parts as in the embodiment shown in FIGS. 1 to 9 are denoted by the same reference numerals, and detailed description thereof is omitted.

(First modification)
In the above-described embodiment, an example in which at least a part of the contours of the first concave portions 71, 81 and the first convex portions 72, 82 respectively has an arc shape in side view or plan view has been described. can't For example, as shown in FIG. 10 or 11, the contours of the first concave portions 71 and 81 may each have a linear shape in side view or plan view, and the contours of the first convex portions 72 and 82 may have linear shapes in side view. Alternatively, they may each have a linear shape in plan view. In this case, as shown in FIG. 10 or 11, the first concave portions 71, 81 and the first convex portions 72, 82 may each have a triangular shape in side view or plan view.

Also in this modified example, when the force F is applied to the paper container 10 and the side portion 23 is about to be deformed, the deformation of the side portion 23 can be suppressed. Therefore, the strength of the paper container 10 can be improved.

(Second modification)
In the embodiment described above, an example has been described in which the first uneven portions 70A and 80A include the first concave portions 71 and 81 and the second uneven portions 70B and 80B include the first convex portions 72 and 82 . In this case, as shown in FIG. 12 or 13, the first uneven portions 70A, 80A include second protrusions 720, 820, and the second uneven portions 70B, 80B include second recesses 710, 810. You can The second protrusions 720 and 820 may be configured to be accommodated within the second recesses 710 and 810 .

In the example shown in FIG. 12 or 13, the shape of the second protrusions 720, 820 of the first uneven portions 70A, 80A is point-symmetrical to the shape of the first recesses 71, 81. In the example shown in FIG. Further, the shape of the second concave portions 710 and 810 of the second concave/convex portions 70B and 80B is point-symmetrical to the shape of the first convex portions 72 and 82 . However, the shape of the second protrusions 720 and 820 is not limited to this, and the shape of the second protrusions 720 and 820 may not be point-symmetrical with the shape of the first recesses 71 and 81. The shape may not be point-symmetrical to the shape of the portions 72 and 82 .

In this modified example, first uneven portions 70A and 80A include second convex portions 720 and 820, and second uneven portions 70B and 80B include second concave portions 710 and 810, respectively. Thereby, it can suppress more effectively that the side part 23 will deform|transform. In addition, the first uneven portions 70A and 80A include second protrusions 720 and 820, and the second uneven portions 70B and 80B include second recesses 710 and 810, so that between the side edges 23c The shape of the gap that can be formed can be more complicated. As a result, when the paper container 10 is transported or the like, it is possible to further prevent surrounding structures from coming into contact with the formed film 40 from the outside. Therefore, the molded film 40 can be effectively protected by the first protrusions 72 .

(Third modification)
In the example shown in FIG. 14, the bottom portion 21 of the paper container 20 has a substantially octagonal shape in plan view. In this case, the paper container 20 has eight sides 23 . Specifically, the paper container 20 further has a third side portion 23d located between the first side portion 23a and the second side portion 23b, the side portion 23 being generally an inverted octagonal truncated pyramid. formed into a shape.

The paper container 20 also has eight flange pieces 25 . Specifically, the paper container 20 further has a third flange piece 25c located between the first flange piece 25a and the second flange piece 25b. Also in this case, the flange piece 25 is formed in an annular shape as a whole.

In this modification, the first uneven portion 70A is formed on the first side portion 23a and the second side portion 23b, and the second uneven portion 70B is formed on the third side portion 23d. In this case, the first uneven portion 70A is formed on both side edges 23c of the first side portion 23a and both side edges 23c of the second side portion 23b. Two first uneven portions 70A are formed. The first uneven portion 70A is formed over the entire side edge 23c of the first side portion 23a and the entire side edge 23c of the second side portion 23b.

The second uneven portions 70B are formed on both side edges 23c of the third side portion 23d, and two second uneven portions 70B are formed on each of the third side portions 23d. Further, the second uneven portion 70B is formed over the entire side edge 23c of the third side portion 23d.

In addition, in this modification, as shown in FIG. 15, the blank member 30 includes eight side panels 33 and eight flange piece panels 35 . Specifically, blank 30 further includes a third side panel 33d located between first side panel 33a and second side panel 33b. The blank 30 also has a third flange piece panel 35c located between the first flange piece panel 35a and the second flange piece panel 35b.

In this modification, the first uneven portion 80A is formed on the first side panel 33a and the second side panel 33b, and the second uneven portion 80B is formed on the third side panel 33d. In this case, the first concave-convex portion 80A is formed on both side edges 33c of the first side panel 33a and both side edges 33c of the second side panel 33b. are formed with two first uneven portions 80A, respectively. The first uneven portion 80A is formed over the entire side edge 33c of the first side panel 33a and the entire side edge 33c of the second side panel 33b.

The second uneven portions 80B are formed on both side edges 33c of the third side panel 33d, and two second uneven portions 80B are formed on each of the third side panels 33d. Further, the second uneven portion 80B is formed over the entire side edge 33c of the third side panel 33d.

Also in this modified example, when the force F is applied to the paper container 10 and the side portion 23 is about to be deformed, the deformation of the side portion 23 can be suppressed. Therefore, the strength of the paper container 10 can be improved.

In addition, as shown in FIG. 16, for example, the first uneven portion 70A may be formed on the third side portion 23d, and the second uneven portion 70B may be formed on the first side portion 23a and the second side portion 23b. . In this case, as shown in FIG. 17, for example, a first uneven portion 80A is formed on the third side panel 33d, and a second uneven portion 80B is formed on the first side panel 33a and the second side panel 33b. may be

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

(Example 1)
First, the formability of the paper container 20 was evaluated. At this time, first, a blank material 30 shown in FIG. 5 was produced. In this case, coated paper having a basis weight of 350 g/m ² was prepared as the material of the blank material 30 . Then, the blank material 30 was produced by punching the coated paper into a predetermined shape.

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

(Strength measurement test)
Next, a strength measurement test was performed. 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 .

Next, the strength of the paper container 10 was measured. At this time, as shown in FIG. 18, the paper container 10 was fixed with a fixing jig 91 so that the flange piece 25 would not move, with the formed film 40 facing downward. Next, the vicinity of the boundary between the first side portion 23a and the second side portion 23b of the bottom portion 21 of the paper container 10 was pressed by a pressing jig 92 having a cylindrical shape with a diameter of 10 mm. At this time, the bottom portion 21 was pressed by the pressing jig 92 until at least one of the first side portion 23a and the second side portion 23b was crushed. At this time, the pressurization speed was set to 50 mm/min. Then, the maximum load applied to the paper container 10 by the pressure jig 92 was measured.

(Example 2)
A strength measurement test was conducted in the same manner as in Example 1 except that a blank material 30 shown in FIG. 11 was produced.

(Example 3)
A strength measurement test was conducted in the same manner as in Example 1 except that a blank material 30 shown in FIG. 15 was produced.

(Example 4)
A strength measurement test was conducted in the same manner as in Example 1 except that a blank material 30 shown in FIG. 17 was produced.

(Comparative example 1)
As shown in FIG. 19, a blank material 30A having a side panel 33 (first side panel 33a, second side panel 33b) in which the first concave-convex portion 80A and the second concave-convex portion 80B are not formed respectively. A strength measurement test was carried out in the same manner as in Example 1 except that it was produced.

(Comparative example 2)
As shown in FIG. 20, the side panel 33 (the first side panel 33a, the second side panel 33b, the third side panel 33d) on which the first concave-convex portion 80A and the second concave-convex portion 80B are not formed. ), a strength measurement test was performed in the same manner as in Example 1 except that a blank material 30B was produced.

Table 1 shows the above results.

As a result, as shown in Table 1, in the paper container according to Comparative Example 1, the maximum load applied until at least one of the first side portion 23a and the second side portion 23b was crushed was 21.8 N. . In the paper container according to Comparative Example 2, the maximum load applied until at least one of the first side portion 23a and the second side portion 23b was crushed was 23.0N.

In contrast, in the paper containers 10 according to Examples 1 to 10, the maximum load applied until at least one of the first side portion 23a and the second side portion 23b was crushed was 33.1 N or more. rice field. Therefore, it was found that the strength of the paper container 10 according to the present embodiment can be improved.

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 23a first side portion 23b second side portion 23c side edge 23d third side portion 24 second fold line 25 flange piece 30 blank Material 31 bottom panel 32 first fold line 33 side panel 33a first side panel 33b second side panel 33c side edge 33d third side panel 34 second fold line 35 flange strip panel 40 forming film 50 lid material 70A first Concave-concave portion 70B Second concave-convex portion 71 First concave portion 72 First convex portion 710 Second concave portion 720 Second convex portion 80A First concave-convex portion 80B Second concave-convex portion 81 First concave portion 82 First convex portion 810 Second concave portion 820 2 convex

Claims (10)

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 a side edge of one side panel,
A first protrusion accommodated in the first recess is formed on a side edge of the other side panel facing the one side panel through the gap,
The first recess is formed over the entire side edge of the one side panel,
The blank material, wherein the first protrusion is formed over the entire side edge of the other side panel. 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 concave-convex portion including a first concave portion is formed on a side edge of one side panel,
A second concave-convex portion including a first convex portion accommodated in the first concave portion is formed on a side edge of the other side panel facing the one side panel through the gap,
The first uneven portion includes a second convex portion,
The second uneven part includes a second concave part in which the second convex part is accommodated,
The first uneven portion is formed over the entire side edge of the one side panel,
The blank member, wherein the second uneven portion is formed over the entire side edge of the other side panel. The blank material according to claim 1 or 2, wherein at least part of the outline of said first convex portion has an arc shape in plan view. The blank material according to claim 1 or 2, wherein at least part of the outline of said first convex portion has a linear shape in plan view. A paper container produced by assembling the blank material according to any one of claims 1 to 4;
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 the side edge of one side,
A first convex portion accommodated in the first concave portion is formed on a side edge of the other side portion adjacent to the one side portion,
The first recess is formed over the entire side edge of the one side portion,
The paper container, wherein the first protrusion is formed over the entire side edge of the other side portion. 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 concave-convex portion including a first concave portion is formed on a side edge of one side portion,
A second concave-convex portion including a first convex portion accommodated in the first concave portion is formed on a side edge of the other side portion adjacent to the one side portion,
The first uneven portion includes a second convex portion,
The second uneven part includes a second concave part in which the second convex part is accommodated,
The first uneven portion is formed over the entire side edge of the one side portion,
The paper container, wherein the second uneven portion is formed over the entire side edge of the other side portion. 8. The paper container according to claim 6 or 7, wherein at least part of the outline of said first convex portion has an arc shape when viewed from the side. 8. The paper container according to claim 6 or 7, wherein at least a part of the outline of said first convex portion has a linear shape when viewed from the side. The paper container according to any one of claims 5 to 9;
A paper container with a lid, comprising a lid that seals the paper container.

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