JP6930650B1 - Paper containers and blank sheets - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a paper container in which a film sheet is appropriately crimped to a container body. SOLUTION: A plurality of side surface portions 13 having an opening 11A on the top surface and extending from each side of a polygonal bottom surface portion 12A are folded at folds along each side of the bottom surface portion 12A and adjacent side surfaces. A film layer 20 in which a paper container body 10A formed in a pyramidal shape in which the side edges 14 of the portions 13 are butted to form corners and a film sheet laminated on the inner surface of the container body 1A are pressure-bonded by vacuum suction. It is a paper container 1A provided with and. The container body 10A is formed with the side edges 14 butted at the corners separated from each other, extends linearly between the bottom surface and the opening, and is longer than the dimension connecting the bottom surface and the opening in a straight line. It is provided with a gap 50 set to the dimensions. [Selection diagram] Fig. 1

Description

The present invention relates to a paper container provided with a film layer in which a film sheet is pressure-bonded to the inner surface of the paper container body.

Conventionally, as a container for storing food or the like, a paper container in which a plastic film sheet is pressure-bonded to the inner surface of a paper container body is known.
This paper container is manufactured by folding a blank sheet, forming it into a container shape, and then crimping a film sheet to the inner surface of the container body. Specifically, the air between the container body in which the blank sheet is folded and the film sheet laminated on the upper surface is vacuum-sucked, and the film sheet is pressure-bonded to the container body.

As one of such paper containers, a tray-type container having a quadrangular pyramid shape has been proposed.
For example, in the container body used for the paper container of Patent Document 1, the side edges of the adjacent side surface portions are butted against each other at the corner portions forming corners on the four side surface portions connecting the upper base and the lower base of the quadrangular pyramid. The side edges are separated from each other to form a linear gap along the corner. Further, it is also disclosed that the suction property of the film sheet with respect to the paper container is ensured by providing an opening for intake air at the connection point between each corner and the bottom surface of the paper container.

Special Table 2013-545675 Gazette

However, in the above-mentioned quadrangular frustum-shaped container, a straight gap provided at each corner is provided with an air passage for sucking air between the container body in which the blank sheet is folded and the film sheet. If only, there is a risk that the suction of the film sheet will be insufficient and the film sheet will not be properly pressure-bonded.
Further, even if the opening for intake is provided as described above, since the structure of the container body does not exist, the suction load is concentrated, so that the film sheet may be damaged during suction.
Therefore, there is room for improvement in providing a paper container in which a film sheet is appropriately crimped to the container body.

This case was devised in view of the above problems, and one of the purposes is to provide a paper container in which a film sheet is appropriately crimped to the container body. Not limited to this purpose, it is also possible that the actions and effects derived from each configuration shown in the “mode for carrying out the invention” described later and which cannot be obtained by the conventional technique are exhibited. It can be positioned as another purpose.

(1) The paper container disclosed here has an opening on the top surface, and a plurality of side surface portions extending from each side of the polygonal bottom surface portion are folded at creases along the respective sides of the bottom surface portion. A paper container body formed in a frustum shape in which side edges extending from the bottom surface portion toward the opening are abutted against each other at the adjacent side surface portions to form a corner portion, and an inner surface of the container body. The container body is formed with the side edges abutted at the corners separated from each other, and is provided between the bottom surface portion and the opening. It is characterized in that it extends linearly and has a gap portion set to a dimension longer than the dimension connecting the bottom surface portion and the opening in a straight line.

(2) It is preferable that the gap portion includes a bent portion in which the gap portion is bent at an intermediate position between the bottom surface portion and the opening.
(3) The container body has the octagonal opening and the octagonal bottom surface, and the side surface has a trapezoidal shape whose width narrows from the bottom surface toward the intermediate position. A first side surface formed by a first region formed by an eggplant and a trapezoidal second region connected to the first region and widened toward the opening, and having the side edge bent in a dogleg shape. A portion and a second side surface portion having the side edge adjacent to the first side surface portion and bent into a shape conforming to the side edge of the first side surface portion are provided, and the gap portion is provided on the side. It is preferable that the edge is bent in a dogleg shape at the bent portion.
(4) Preferably, a crease is provided between the first region and the second region on the first side surface portion, and the crease between the first region and the second region is provided. A plurality of cuts are formed intermittently along the line.

(5) The container body has the square-shaped opening and the octagonal bottom surface portion, and the side edges are abutted against each other in a region from the opening to the intermediate position on the side surface portion. A triangular third side surface that is arranged between the first side surface portion and the second side surface portion, and the first side surface portion and the second side surface portion, and extends from the bottom surface portion to the intermediate position. It is preferable that the gap portion is provided with a portion, and the gap portion is branched into two at the bent portion from the opening toward the bottom surface portion along both side edges of the third side surface portion.

(6) It is preferable that a plurality of cuts are intermittently formed along the crease between each side of the bottom surface portion and the side surface portion.
(7) Each of the plurality of the side surface portions has a flange portion extending from the end edge on the opening side to the side opposite to the opening, and the side edges of the flange portion are butted against each other. It is preferable to have.
(8) In addition, the present disclosure is a blank sheet used for molding the container body of the paper container according to any one of (1) to (7).

According to the present case, it is possible to provide a paper container in which a film sheet is appropriately pressure-bonded to the container body.

It is a perspective view of the paper container which concerns on 1st Embodiment of this invention. It is a top view which shows the paper container of FIG. It is sectional drawing which shows the AA cross section of FIG. It is a top view of the blank sheet for the container body of FIG. It is a perspective view of the mold (molding mold) for manufacturing the paper container of FIG. It is explanatory drawing of the manufacturing method of the paper container of FIG. It is a perspective view of the paper container which concerns on 2nd Embodiment of this invention. It is a top view which shows the paper container of FIG. It is a top view of the blank sheet for the container body of FIG. (A) to (d) are explanatory views of the modified example of the paper container.

Hereinafter, a paper container as an embodiment will be described.
In this embodiment, the posture in which the paper container is placed on a horizontal plane is illustrated. The paper container of the present embodiment is symmetrical in the front-rear and left-right directions.
Of the vertical directions, the direction of action of gravity is downward (indicated by "D" in the figure), and the opposite direction of downward is upward (indicated by "U" in the figure). Further, the space side in which the article is stored in the storage space of the container body is the inner side, and the opposite side of the inner side is the outer side.

[I. First Embodiment]
In the first embodiment below, the configuration relating to the paper container will be described in item [1]. Next, the configuration of the molding die used for manufacturing the paper container of item [1] will be described in item [2]. Then, the effect of the configuration of items [1] and [2] is described in item [3].
[1. Composition of paper container]
[1-1. Overview]
The paper container 1A according to the first embodiment will be described with reference to FIGS. 1 to 4.
As shown in FIG. 1, the paper container 1A is a ball-shaped or bowl-shaped paper tray-type container. As the paper container 1A, a food packaging container for storing food can be mentioned as an example. However, the paper container 1A can contain not only food but also various things.
The paper container 1A includes a paper container body 10A and a film layer 20 obtained by pressure-bonding a film sheet laminated on the inner surface of the container body 10A by vacuum suction.

<Container body>
The container body 10A is a package having an octagonal opening 11A on the top surface and a storage space inside.
The container body 10A includes an octagonal (polygonal) bottom surface portion 12A and eight side surface portions 13 extending from each side of the bottom surface portion 12A. A crease 17 extends between each side of the bottom surface portion 12A and the side surface portion 13.

The container body 10A is formed into a pyramid-shaped shape by folding eight side surface portions 13 at the fold 17. The material used for the container body 10A is not particularly limited as long as it is a commonly used paper, and a paper containing plant-derived pulp as a main component is preferable, and a paper containing wood pulp as a main component is used. More preferably.
Specific examples thereof include kraft paper, high-quality paper, (white) paperboard, base paper for paper containers, milk carton base paper, cup base paper, liner paper, coated paper, single-gloss paper, glassin paper, and graphan paper. Of these, kraft paper, woodfree paper, (white) paperboard, base paper for paper containers, cup base paper, and single-gloss paper are preferable. Among the (white) paperboards, high-grade paperboard, special paperboard, cup base paper, and kraft paper are more preferable from the viewpoint of rigidity. Examples of the kraft paper include bleached kraft paper, unbleached kraft paper, and single-gloss bleached kraft paper, and bleached kraft paper and single-gloss bleached kraft paper are preferable from the viewpoint of printability and hygiene.

Further, a corrugated cardboard composed of three layers of a liner, a core and a liner may be used, and a microflute having a small thickness of the corrugated cardboard is particularly preferable from the viewpoint of achieving both strength and moldability of the container body 10A.
The basis weight of the paper is preferably 200 to 800 g / m ² , more preferably 200 to 700 g / m ² , still more preferably 200 to 500 g / m ² , and even more preferably 300 to 500 g / m. It is ^2.
From the viewpoint of moldability, the density of the paper is preferably 0.5 to 1.2 g / cm ³ , more preferably 0.6 to 1.0 g / cm 3, and even more preferably 0.7 to 0.7 to 1.0 ^{g / cm 3.} was 0.9 g / cm ^3, even more preferably from 0.8 to 0.9 g / cm ^3.

The thickness of the paper is preferably 200 to 1000 μm, more preferably 250 to 1000 μm, still more preferably 300 to 700 μm, and even more preferably 300 to 500 μm.
Various additives may be contained in the paper, and examples of the internal sizing agent include rosin-based, alkyl-ketene dimer-based, alkenyl succinic anhydride-based, styrene-acrylic, higher fatty acid-based, and petroleum resin-based. Be done. In addition to the internal sizing agent, other known internal additives may be added. Internal additives include fillers, paper strength enhancers, yield improvers, pH adjusters, water drainage improvers, water resistant agents, fabric softeners, antistatic agents, defoamers, slime control agents, dyes / pigments, etc. Can be mentioned.

Examples of the filler include titanium dioxide, kaolin, talc, calcium carbonate and the like.
For paper making, a known wet paper machine can be appropriately selected and used.
Examples of the paper machine include a long net paper machine, a gap former type paper machine, a circular net type paper machine, and a short net type paper machine.
The paper layer formed by the paper machine is preferably conveyed by, for example, felt and dried by a dryer. A multi-stage cylinder dryer may be used as a pre-dryer before drying the dryer.
Further, the paper obtained as described above may be surface-treated with a calendar to make the thickness and profile uniform. As the calendar processing, a known calendar processing machine can be appropriately selected and used.
The material used for the container body 10A is not limited to the above, and various paper materials can be used.

As shown in FIGS. 1 to 3, in a state where the side surface portions 13 are folded and formed into a pyramidal trapezoidal shape, the side edges 14 extending from the bottom surface portion 12A toward the opening 11A protrude from each other at the adjacent side surface portions 13. Combined to form a pyramidal frustum-shaped corner. The container body 10A is formed into an octagonal frustum shape having eight corners where the side edges of the eight side surfaces 13 are butted against each other. The "corner portion" referred to here is a portion of the pyramid base that forms a corner on the side surface portion 13 that connects the upper base and the lower base, and does not include a portion that forms a corner between the side surface portion 13 and the bottom surface portion 12A.

A gap 50A is provided at the corner where the side edges 14 are butted against each other.
The gap portion 50A is formed so that the side edges 14 are separated from each other, and extends linearly between the bottom surface portion 12A and the opening 11A.
The gap 50A is a corner portion that connects the inner surface side (inside the accommodation space) and the outer surface side (outside the accommodation space) of the container body 10A, and is a vacuum in the manufacturing process of the paper container 1A described later. It serves as a passage (flow passage) for air to pass from the inner surface side to the outer surface side of the container body 10A at the time of suction.
The dimension at which the side edges 14 are separated from each other in the gap 50A is set in consideration of both the air permeability during suction and the moldability of the container body 10A.

The gap portion 50A of the present embodiment is set to a dimension longer than the dimension connecting the bottom surface portion 12A and the opening 11A with a straight line. The "straight line" here means a straight straight line connecting the corner of the bottom surface portion 12A to the upper end of the side edge 14 on the side surface portion 13 (the intersection of the upper edge 16 and the side edge 14).
The gap portion 50A includes a bent portion 51A in which the gap portion 50A is bent at an intermediate position M between the bottom surface portion 12A and the opening 11A. In the present embodiment, a case where the gap portion 50A is bent in a dogleg shape by the bent portion 51A will be described as an example. The detailed configuration of the gap 50A will be described later.

In addition, the container body 10A has a flange portion 15 extending from the upper edge (opening 11A side) edge 16 to the side opposite to the opening 11A on each side surface portion 13. The flange portion 15 is a flange-shaped portion provided along the outer circumference of the opening 11A. The side edges of the flange portions 15 extending from the adjacent side surface portions 13 are also abutted against each other to form a gap portion apart from each other. In other words, the gap portion 50A is provided so as to extend to the flange portion 15.

<Film layer>
The film layer 20 is a layer in which the inner surface side of the paper container body 10A is covered (interiored) with a film sheet. The film layer 20 is a functional layer that imparts functions such as water resistance and heat resistance to the inner surface of the paper container body 10A, including a function of maintaining a state in which each side surface portion 13 is folded by the container body 10A.
As the film sheet used for the film layer 20, a sheet material having properties according to the function to be imparted is used. For example, a plastic sheet having functions such as stretchability, water resistance, heat resistance, and heat fusion property in which the film is stretched when the film is adsorbed on the container body is adopted as the film sheet.

The film sheet is preferably a resin laminate having stretchability and barrier properties. The resin laminate includes a barrier layer in the intermediate layer, and the layer in contact with the inner surface of the container body 10A needs to be heat-sealed to the container body 10A. Therefore, the resin laminate must be a resin laminate including a layer made of a thermoplastic resin. Is more preferable. That is, the resin laminate is more preferably a film layer 20 including a barrier layer in the intermediate layer and a layer made of a thermoplastic resin in the layer in contact with the inner surface of the container body 10A.

The barrier layer is not limited to the resin, but may be a metal foil or the like, but is preferably composed of a resin from the viewpoint of making the printed surface of the paper base material visible and enhancing the design. It is more preferable to be configured.
As the resin constituting the barrier layer, at least one selected from the group consisting of a polyamide resin, a polyvinyl alcohol, an ethylene-vinyl alcohol copolymer and a polyvinylidene chloride resin is preferable, and a polyamide resin, a polyvinyl alcohol and an ethylene-vinyl alcohol are preferable. More preferably, at least one selected from the group consisting of copolymers.
As the polyamide-based resin, aromatic polyamide is preferable, and polyamide MXD6 is more preferable.

Examples of the resin constituting the layer in contact with the inner surface of the container body 10A of the resin laminate include polyolefin resins such as polyethylene and polypropylene, aliphatic polyamide resins such as nylon 6, polyethylene terephthalate (PET), and polybutylene terephthalate (PBT). Such as polyester resin can be mentioned.
The layer facing the inside of the accommodating space is, for example, a polypropylene (PP) resin, specifically, a homopolypropylene, a random polyppyrene copolymer, or a block polypropylene copolymer, and in particular, a random polypropylene copolymer is used. Is preferable.

Examples of the polyamide resin include aliphatic polyamide polymers such as nylon 6, nylon 66, nylon 69, nylon 610, nylon 612, nylon 11, and nylon 12, and nylon 6-66 (representing a copolymer of nylon 6 and nylon 66). An aliphatic polyamide copolymer such as Nylon 6-10, Nylon 6-12, Nylon 6-69, Nylon 6-610, and Nylon 66-69 can be exemplified below. Of these, aliphatic polyamide copolymers are preferable, and nylon 6-66, nylon 6-10 or nylon 6-12 are particularly preferable. These may be used alone or in combination of two or more.

Typical examples of the polyester resin include poly (ethylene terephthalate), poly (butylene terephthalate), poly (ethylene terephthalate / isophthalate), and poly (ethylene glycol / cyclohexanedimethanol / terephthalate). Furthermore, diols such as ethylene glycol, butylene glycol, cyclohexanedimethanol, neopentyl glycol, and pentandiol, or isoftals, benzophenone dicarboxylic acid, diphenylsulfonedicarboxylic acid, diphenylmethanedicarboxylic acid, and propylene bis are added to these polymers as copolymerization components. Contains dicarboxylic acids such as (phenylcarboxylic acid), diphenyloxide dicarboxylic acid, oxalic acid, maleic acid, malonic acid, succinic acid, glutaric acid, adipic acid, pimeric acid, suberic acid, azelaic acid, sabatic acid, diethylsuccinic acid. You can use the succinic acid.

Examples of the polyolefin resin include linear low-density polyethylene, low-density polyethylene, medium-density polyethylene, polyethylene-based resin such as high-density polyethylene, polypropylene-based resin such as polypropylene, propylene-ethylene copolymer, and ethylene-vinyl acetate. Examples thereof include various copolymers such as copolymers, ionomer resins, ethylene- (meth) acrylic acid copolymers, and ethylene- (meth) acrylic acid-unsaturated carboxylic acid ester copolymers. A polyethylene-based resin is preferable, and a linear low-density polyethylene is particularly preferable. These may be used alone or in combination of two or more.
The film sheet used for the film layer 20 may have a multi-layered structure in which various types are combined in addition to the above-mentioned structure.

Further, from the viewpoint of reducing the environmental load, the film sheet used for the film layer 20 preferably uses a biodegradable resin such as polylactic acid (PLA), polyglycolic acid (PGA), or polybutylene succinate (PBS).
The thickness of the film layer 20 is preferably 10 to 300 μm, more preferably 15 to 200 μm, more preferably 20 to 100 μm, and even more preferably 30 to 50 μm.
The film sheets used for the film layer 20 may be laminated by a dry laminating method, but a film formed by a co-extrusion method, which is melt-extruded at the same time, is preferable.

[1-2. detail]
The detailed configuration of the container body 10A according to the first embodiment will be described. In the following description, one of the side surface portions 13 adjacent to the container body 10A will be referred to as a first side surface portion 31A, and the other will be referred to as a second side surface portion 32A.
The first side surface portion 31A is formed by a first region 130, and a first region 130 and a second region 131 connected to each other via a fold 18. The fold 18 is a fold line extending parallel to the side of the bottom surface portion 12A along the surface of the first side surface portion 31A at the intermediate position M. In the first side surface portion 31A, the first region 130 is bent toward the inside of the container body 10A through the crease 18 with respect to the second region 131.

The first region 130 has a trapezoidal shape in which the width narrows from the bottom surface portion 12A toward the intermediate position M. The second region 131 has a trapezoidal shape that widens from the fold 18 corresponding to the upper bottom of the first region 130 toward the opening 11A.
That is, the first side surface portion 31A is an hourglass-shaped surface portion enclosed at the intermediate position M when viewed from the side surface, and the side edges 41A thereof are bent in a dogleg shape at the intermediate position M.

The second side surface portion 32A has a side edge 42A bent into a shape conforming to the side edge 41A of the first side surface portion 31A, and has a hexagonal shape having a portion that widens from the bottom surface portion 12A toward the intermediate position M. It is the side part of.
Specifically, the side edge 42A of the second side surface portion 32A has a dogleg shape that is bent along the side edge 41A of the adjacent first side surface portion 31A. Therefore, a dogleg-shaped gap 50A is formed between the side edge 41A of the first side surface portion 31A and the side edge 42A of the second side surface portion 32A, and this gap portion 50A is the bent portion 51A at the intermediate position M. It is bent in a dogleg shape.

Further, in the container body 10A of the first embodiment, a plurality of folds 17 extend between each side of the bottom surface portion 12A and the first side surface portion 31A and the second side surface portion 32A (side surface portion 13). Notches are formed intermittently.
Further, in the first side surface portion 31A, a plurality of cuts are intermittently formed along the crease 18 extending between the first region 130 and the second region 131.

The plurality of cuts formed along the folds 17 and 18 form a linearly intermittent gap (slit penetrating the container body 10A in the thickness direction) at the folds 17 and 18 (container body 10A). None, it is a flow passage for air to pass from the inner surface side to the outer surface side of the container body 10A at the time of suction described later.
The size of the cuts along the extending direction of the folds 17 and 18 and the number of cuts are set in consideration of both the air permeability at the time of suction and the moldability of the container body 10A.

In addition, if the four first side surface portions 31A of the paper container 1A shown in FIGS. 1 to 3 are regarded as "square surface portions forming the corners of a quadrangular frustum", the paper container 1A has four main components. It is also possible to overview the container as a quadrangular frustum having a side surface (second side surface portion 32A) and four square surface portions (first side surface portion 31A) provided between the side surfaces.
When the paper container 1A is regarded as a quadrangular frustum shape in this way, it bends in a "dogleg" shape along both side edges of the square surface portion (first side surface portion 31A) forming the corner of the quadrangular pyramid shape. It can be said that the gap portion 50A is provided. It can be said that the first region 130 of the first side surface portion 31A forms a chamfered surface portion on the bottom surface portion 12A side of the square surface portion forming the corner of the quadrangular pyramid shape.

[1-3. Blank sheet for container body]
As shown in FIG. 4, the blank sheet 10A'used for the container body 10A includes an octagonal bottom sheet piece 12A'and a side sheet piece 13'extending from each side of the bottom sheet piece 12A'. It has. In the description of FIG. 4, the direction in which the side surface sheet piece 13'extends from each side of the bottom sheet piece 12A'is referred to as the" extension direction ", and the side surface sheet piece 13' along the extension direction. The side of the bottom sheet piece 12A'is referred to as "inside" in the extension direction, and the opposite side is referred to as "outside" in the extension direction.

A crease line 17'is provided along the side of the bottom sheet piece 12A'between the bottom sheet piece 12A'and the side surface sheet piece 13'.
In each side surface sheet piece 13', a crease line 16'parallel parallel to the side of the bottom sheet piece 12A' is provided on the outer edge in the extending direction, and extends from the fold line 16'. The flange sheet piece 15'extends outward in the direction.

Of the side surface sheet pieces 13 ′, the first side surface sheet piece 31A ′ has a trapezoidal first region 130 ′ whose width narrows from the side of the bottom surface sheet piece 12A ′ toward the outside in the extending direction. And a second region 131'which is connected to the first region 130' and has a trapezoidal shape whose width increases outward in the extending direction toward the opening 11A.
The side edge 41A'(side edge 14') of the first side surface sheet piece 31A' has a dogleg-shaped bent shape.

Of the side surface sheet pieces 13', the second side surface sheet piece 32A' has a hexagonal shape having a portion that widens from the side of the bottom surface sheet piece 12A' toward the outside in the extending direction. The side edge 42A'(side edge 14') of the second side surface sheet piece 32A' has a dogleg-shaped bent shape that fits the side edge 41A' of the adjacent first side surface sheet piece 31A'. ..

[2. Mold composition]
Next, the configuration of the molding die 150 used for manufacturing the paper container 1A using the blank sheet 10A'of FIG. 4 will be described with reference to FIGS. 5 and 6.
FIG. 5 is a perspective view of a molding die 150 used for manufacturing a paper container 1A using the blank sheet 10A'.
The molding die 150 is a die (cavity, female die) for molding the blank sheet 10A'into a pyramid-shaped container body 10A and for crimping the film layer 20 to the inner surface of the container body 10A by vacuum suction.

The molding die 150 includes a recess 52 recessed on the upper surface side of the base portion 151. The base portion 151 is a base portion that supports the recess 52. The recess 52 is formed in a shape corresponding to the container body 10A to be molded (see FIGS. 1 to 3), and forms a recess into which the blank sheet 10A'is pushed.
The inner surface of the recess 52 is provided with a plurality of air holes (reference numeral 58 in FIG. 6 described later) that communicate the inside and the outside of the recess 52 in order to perform suction processing. These air holes are scattered apart from each other.

The recess 52 has a plurality of surface portions 53 on the inner surface corresponding to the surface shape of the container body 10A (see FIGS. 1 to 3) in a state where the container body 10A (see FIGS. 1 to 3) is placed.
Specifically, the bottom surface portion 12A (see FIGS. 1 to 3) of the container body 10A is placed on the plurality of surface portions 53 in a state where the container body 10A (see FIGS. 1 to 3) is placed in the recess 52. ), And eight second surface portions 55 corresponding to the side surface portions 13 (see FIGS. 1 to 3) of the container body 10A.

The molding die 150 has a flange surface portion 56 extending from the upper edge of the recess 52 toward the outside of the recess 52. The flange surface portion 56 can be subdivided into eight portions corresponding to each of the eight second surface portions 55 along the outer circumference of the recess 52.
Further, a stepped portion 57 is provided so as to be convex along the outer periphery of each flange surface portion 56. The step portion 57 forms a step that rises on the outside with respect to the surface portion of each flange surface portion 56.

On the inner surface of the recess 52, a groove portion is formed along a linear region corresponding to a linearly extending gap in the container body 10A in a state where the container body 10A (see FIGS. 1 to 3) is placed in the recess 52. 60 is extended.
The groove 60 is provided so as to communicate with at least two of the scattered air holes, and forms an air flow passage that extends linearly on the inner surface of the recess 52 during suction processing.
The groove portion 60 of the present embodiment extends linearly along the boundary between the plurality of surface portions 53 on the inner surface of the recess 52. The boundary between the plurality of surface portions 53 faces a portion of the container body 10A (see FIGS. 1 to 3) where each side of the bottom surface portion 12A and the side surface portion 13 are in contact with each other and a portion where the adjacent side surface portions 13 are butted against each other. It is recessed.
The groove portion 60 illustrated here includes a side groove portion 61 extending along the boundary between the second surface portions 55 among the boundaries between the plurality of surface portions 53, and the first surface portion 54 and the second surface portion 55. There is a bottom groove portion 62 extending along the boundary, an upper groove portion 63 extending along the boundary between the flange surface portions 56, and a middle groove portion 64 extending along the linear region corresponding to the crease 18. ..

The gutter portion 61 has side edges of the second surface portion 55 corresponding to the side surface portion 13 (see FIGS. 1 to 3) in a state where the container body 10A (see FIGS. 1 to 3) is placed in the recess 52. It is provided between. The bottom groove portion 62 faces between the bottom surface portion 12A and the side surface portion 13 of the container body 10A in a state where the container body 10A (see FIGS. 1 to 3) is placed in the recess 52.
The upper groove portion 63 faces the gap between the side edges of the flange portion 15 of the container body 10A in a state where the container body 10A (see FIGS. 1 to 3) is placed in the recess 52.
The middle groove portion 64 faces between the first region 130 and the second region 131 of the first side surface portion 31A in a state where the container body 10A (see FIGS. 1 to 3) is placed in the recess 52.

Next, with reference to FIG. 6, a manufacturing apparatus 100 for manufacturing the paper container 1A using the molding die 150 will be described.
The manufacturing apparatus 100 includes a first preparation section 101 in which the blank sheet 10A'of the container body 10A is folded and arranged along the recess 52 of the molding die 150, and a blank sheet 10A'folded in the first preparation section 101. The second preparation unit 102 in which the film sheet 20'is arranged upward and the film sheet 20'arranged in the second preparation unit 102 are pushed into the blank sheet 10A'arranged in the first preparation unit 101 while heating. The press portion 103 and the suction portion 104 for crimping the film sheet 20'pressed by the press portion 103 to the blank sheet 10A'by vacuum suction are provided.

The suction unit 104 includes a suction device (not shown) that sucks air through the air holes 58.
The press portion 103 includes a heating device (not shown) for heating and softening the film sheet 20', and a convex portion 70 for pushing the film sheet 20'. The convex portion 70 is a convex mold (plug, male mold) corresponding to the concave portion 52, and is urged downward by an urging device (not shown). The convex shape of the convex portion 70 is set to a dimension smaller than that of the concave portion 52.

The method of manufacturing the paper container 1A with the manufacturing apparatus 100 includes the following steps S1 to S4.
Step S1: The blank sheet 10 of the container body 10A along the recess 52 of the molding die 150.
First preparation step of folding and arranging A'Step S2: A film above the blank sheet 10A'folded in the first preparation step.
Second preparatory step for arranging the sheet 20'Step S3: Second preparatory step toward the blank sheet 10A'arranged in the first preparatory step.
Pressing process of pushing the film sheet 20'arranged in 1 while heating Step S4: The film sheet 20'pressed in the pressing step is pressed by vacuum suction.
Suction process for crimping to rank sheet 10A'

In the manufacturing apparatus 100 described above, when the film sheet 20'arranged in the second preparation unit 102 was pushed toward the blank sheet 10A'arranged in the first preparation unit 101 while heating, the film sheet 20'was pushed into the recess 52. The blank sheet 10A'is formed into a container body 10A by folding the side surface portion 13 with respect to the bottom surface portion 12A.

In this state, when air is sucked through the air hole 58 by the suction unit 104, the air between the container body 10A and the film sheet 20'is passed through the gap 50A of the container body 10A and the cuts of the folds 17 and 18. Is sucked out. As a result, a vacuum is created between the container body 10A and the film sheet 20', the film sheet 20'is brought into close contact with the bottom surface portion 12A, the side surface portion 13, and the flange portion 15, and the film layer 20 is formed on the inner surface of the container body 10A. The paper container 1A to which is crimped is molded (vacuum molding).

In the paper container 1A formed as described above, in a state where a storage object such as food is stored in the storage space of the container body 10A, the inside of the storage space of the container body 10A is replaced with gas to form the flange portion 15. The opening 11B is closed with the bonded sealing material (film sheet).

[3. Action and effect]
Since the paper container 1A of the first embodiment has the above-described configuration, the following actions and effects can be obtained.
(1) Since the gap 50A is set to be longer than the dimension connecting the bottom surface 12A and the opening 11A in a straight line, the straight gap along the corner is set to be longer than the conventional structure in which the air flow path is formed. The cross-sectional area of the air flow path (dimensions when viewed from the front of the gap 50A) can be secured in the gaps at the corners. Therefore, the air between the container body 10A and the film sheet is surely sucked, and the film sheet can be surely crimped to the container body 10A.
Further, since air is easily sucked uniformly through the linear gap 50A, the suction load is dispersed and the film sheet is less likely to be damaged as compared with the conventional structure in which the suction opening is provided. From this point as well, the film sheet can be reliably crimped to the inner surface of the container body 10A.
Therefore, it is possible to provide the paper container 1A in which the film sheet is appropriately crimped to the container body.

(2) Since the gap portion 50A is bent by the bent portion 51A, the dimension of the airable gap can be lengthened with a simple structure as compared with the straight gap portion.
(3) The side edges 41A and 42A are bent in a dogleg shape on the first side surface portion 31A and the second side surface portion 32A, respectively, and the gap portion 50A is bent in a dogleg shape. The structure for ensuring the long size of the gap 50A is simple.

Further, the first side surface portion 31A is formed by the trapezoidal first region 130 and the second region 131, and the planar portion increases at the corner portion of the container body 10A, so that the container body 10A is less likely to bend and the container body 10A is less likely to bend. It becomes easy to secure the strength of 10A. By increasing the planar portion at the corner of the container body 10A, the shape of the inner surface of the storage space of the container body 10A approaches a spherical shape, and the heat circulation efficiency when the paper container 1A is cooked by a microwave oven is improved. improves.

(4) Since a plurality of notches are formed along the crease 17 between each side of the bottom surface portion 12A and the side surface portion 13, a linear gap is provided in addition to the gap portion 50A, so that the bottom surface portion The film sheet can be easily pulled into the 12A side, and the film layer 20 can be formed more reliably.
(5) Since a plurality of notches are formed along the crease 18 between the first region 130 and the second region 131 on the first side surface portion 31A, a linear gap is formed in addition to the gap portion 50A. It can be increased further. Therefore, the film sheet can be easily pulled into the first side surface portion 31A side, and the film layer 20 can be formed more reliably.

(6) The flange portion 15 extends from each side surface portion 13, and the side edges of the adjacent flange portions 15 are butted against each other, so that partial overlap between the flange portions 15 and a step due to this are less likely to occur. Therefore, the upper surface of the flange portion 15 can be easily formed into a flat surface, so that the film layer 20 can be reliably formed on the upper surface of the flange portion 15.
In addition, the blank sheet used for the container body 10A of the paper container 1A has the same effect as the above (1) to (6).

Further, since the molding die 150 of the first embodiment has the above-described configuration, the following actions and effects can be obtained.
(7) A groove 60 provided in the recess 52 of the molding die 150 in communication with at least two air holes 58 and extending along a linear region corresponding to a linearly extending gap in the container body 10A. Therefore, the film sheet on the upper surface side of the container body 10A can be sucked linearly and uniformly. Therefore, the suction load is dispersed and the adsorptivity of the film sheet can be ensured.
(8) In the molding die 150, the top surface has an opening 11A, a plurality of side surface portions 13 are folded at folds 17 along each side of the polygonal bottom surface portion 12A, and side edges 14 are formed at adjacent side surface portions 13. Manufacture of a paper container 1A including a paper container body 10A formed into a square frustum shape in which the surfaces are butted against each other to form corners, and a film layer 20 obtained by crimping a film sheet laminated on the inner surface of the container body 10A. It is used for. In the mold 150, since the film sheet can be linearly and uniformly sucked along the linear region corresponding to the linearly extending gap in the container body 10A, it is made of a pyramid-shaped paper configured as described above. Suitable for container 1A.

(9) Since the groove portion 60 extends linearly along the boundary between the plurality of surface portions 53 corresponding to the surface shape of the container body 10A, each side and the side surface portion 13 of the bottom surface portion 12A of the container body 10A. It is possible to uniformly suck in a linear shape along the portion in contact with the surface and the portion where the adjacent side surface portions 13 are butted against each other. Therefore, the suction load is dispersed and the adsorptivity of the film sheet can be ensured.
(10) According to the gutter portion 61, the film sheet on the upper surface side of the container body 10A can be uniformly sucked along the gap between the abutting portions of the side surface portions 13. Therefore, the adsorptivity of the film sheet becomes more reliable.
Moreover, since the gutter portion 61 functions as a relief allowance for the side edges 14 at the abutting portion between the side surface portions 13, a gap between the side edges 14 of the side surface portions 13 can be reliably secured at the abutting portion. Further, the side surface portions 13 are less likely to be arranged in an overlapping manner, and the moldability of the container body 10A is ensured.

(11) According to the bottom groove portion 62, since suction can be performed along the boundary between the bottom surface portion 12A and the side surface portion 13 of the container body 10A, the film sheet can be reliably pulled into the bottom surface side of the recess 52.
(12) Since the upper groove portion 63 secures a relief allowance at the abutting portion of the flange portion 15, it is difficult for the flange portions 15 to be arranged in an overlapping manner, and the moldability of the container body 10A is ensured.
Further, the stepped portion 57 projecting along the outer periphery of the flange surface portion 56 makes it easy to peel off the film sheet from the molding die 150 after molding the paper container 1A.
In addition, the manufacturing apparatus 100 and the manufacturing method using the molding die 150 have the same effects as those in (7) to (11) above.

[II. Second embodiment]
Next, in this item [1], the paper container 1B according to the second embodiment will be described with reference to FIGS. 7 to 9.
FIG. 7 is a perspective view of the paper container 1B, and FIG. 8 is a view of the paper container 1B viewed from above. FIG. 9 is a plan view of the blank sheet 10B'used for the container body 10B. In the paper container 1B of FIGS. 7 to 9, the paper container 1A of FIGS. The gap 50B and the bent 51B are different, and the other configurations are the same. In the following description, the same configurations as those in FIGS. 1 to 4 are designated by the same reference numerals, and duplicate description will be omitted.

[1. composition]
As shown in FIGS. 7 and 8, in the paper container 1B, the container body 10B has a square opening 11B and an octagonal bottom surface portion 12B, and eight extending from each side of the bottom surface portion 12B. The two side surface portions 13 are folded and formed into a pyramidal table shape.
The side surface portion 13 of the container body 10B has three types: a first side surface portion 31B, a second side surface portion 32B, and a third side surface portion 33B.

The side edges 41B and 42B of the first side surface portion 31B and the second side surface portion 32B are butted against each other in the region from the opening 11B to the intermediate position M. Each of the first side surface portion 31B and the second side surface portion 32B is formed in a hexagonal shape in which the width increases from the bottom surface portion 12B toward the opening 11B, and the upper edge 16 on the upper side (opening 11B side) is the opening 11B. Make one side.
The third side surface portion 33B is arranged so as to be sandwiched between the first side surface portion 31B and the second side surface portion 32B, and is formed in a triangular shape extending from the bottom surface portion 12B to the intermediate position M.

The gap portion 50B of the container body 10B is formed by a side edge 41B of the first side surface portion 31B, a side edge 42B of the second side surface portion 32B, and a side edge 43B of the third side surface portion 33B.
Specifically, the gap portion 50B forms a straight line along the side edges 41B and 42B from the opening 11B to the intermediate position M, and the first side surface portion 31B is formed from the bent portion 51B at the intermediate position M toward the bottom surface portion 12B. It is branched into two, a gap along one side edge 43B of the side edge 41B and the third side surface portion 33B, and a gap along the side edge 42B of the second side surface portion 32B and the other side edge 43B of the third side surface portion 33B. ing.

In addition, it can be said that in the paper container 1B shown in FIGS. 7 and 8, the third side surface portion 33B forms a chamfered surface portion on the bottom surface portion 12B side of the four quadrangular pyramid-shaped corner portions. Further, the gap portion 50B can be said to be a "Y-shaped gap" branched along the chamfered surface portion on the bottom surface portion 12B side of the four quadrangular pyramid-shaped corner portions.

As shown in FIG. 9, in the blank sheet 10B'used for the container body 10B, the side surface sheet piece 13'extending from each side with the octagonal bottom sheet piece 12B' has the first side surface sheet. There are a piece 31B', a second side surface sheet piece 32B', and a third side surface sheet piece 33B'.
Each of the first side surface sheet piece 31B'and the second side surface sheet piece 32B' has a hexagonal shape in which the width increases from one side of the bottom surface sheet piece 12B' to the outside in the extending direction. The side edges 41B'and 42B' of the first side surface sheet piece 31B'and the second side surface sheet piece 32B' have a dogleg-shaped bent shape.

The third side surface sheet piece 33B' has a triangular shape extending outward from one side of the bottom surface sheet piece 12B' in the extending direction. Specifically, the third side surface sheet piece 33B'shapes an isosceles triangle with equal lengths on both side edges 43B'.
The dimension (triangle height) along the extending direction of the third side surface sheet piece 33B'is smaller than the dimension along the extending direction of the first side surface sheet piece 31B'and the second side surface sheet piece 32B'. It is set, and the gap 50B is branched into two at the intermediate position M in the container body 10B formed by using the blank sheet 10B'.

The molding die used for manufacturing the paper container 1B using the blank sheet 10B'in FIG. 9 has a recess formed in a shape corresponding to the container body 10B (see FIGS. 7 and 8) to be molded. It is different from the molding die 150 of FIG. 5 in that a groove corresponding to the container body 10B is provided, and other configurations are the same.
The first side surface portion 31B, the second side surface portion 32B, and the third side surface portion 33B are butted against each other with the container body 10B placed as a groove on the inner surface of the molding mold recess used for manufacturing the paper container 1B. A side groove portion facing the portion, a bottom groove portion facing between the bottom surface portion 12B and the side surface portion 13, and an upper groove portion facing the gap between the side edges of the flange portion 15 are provided.

[2. Action and effect]
Since the paper container 1B of the second embodiment has the above-described configuration, the following actions and effects can be obtained.
(13) Since the gap portion 50B is branched into two, the dimension of the gap that can be ventilated can be secured longer than that of the straight gap portion. Therefore, the suction property of the film sheet is easily ensured, and the film layer 20 can be reliably formed. Further, as compared with the conventional structure provided with the suction opening, the suction load is easily dispersed, the film sheet is less likely to be torn, and the film layer 20 is surely formed.
Therefore, the paper container 1B can be appropriately manufactured.
Further, a triangular third side surface portion 33B is formed on the bottom surface portion 12B side at the corner portion of the container body 10B, and the surface shape portion increases at the corner portion of the container body 10B, so that the container body 10B is less likely to bend. It becomes easy to secure the strength of the container body 10B. Since the shape of the inner surface of the storage space of the container body 10B becomes close to a spherical shape by increasing the planar portion at the corner of the container body 10B, the heat circulation efficiency when the paper container 1B is cooked by a microwave oven is improved. It will be improved.
In addition, the same effect as that of the first embodiment can be obtained from the same configuration as that of the first embodiment.

[III. Modification example]
The above embodiments are merely examples, and there is no intention of excluding the application of various modifications and techniques not specified in these embodiments. Each configuration of the present embodiment can be variously modified and implemented without departing from the gist thereof. In addition, it can be selected as needed and can be combined as appropriate.

For example, the gap portion is not limited to the form bent at the bent portion, and may be a curved curved gap.
The shape of the paper container is not limited to the above-mentioned ball type or bowl type (deep dish type), and may be, for example, a shallow tray type container, and is not limited to the above-mentioned octagonal frustum shape or quadrangular pyramid type. It may be in the shape of any polygonal pyramid.
The cuts made at the folds (reference numerals 17 and 18) in the paper container may be omitted.

The molding die is not limited to a structure in which the groove portion is extended along all the boundaries of the plurality of face portions, and may be a structure in which the groove portion is extended along a part of the boundary of the plurality of face portions. For example, the upper groove portion 63 of the flange surface portion may be omitted.
The manufacturing apparatus is not limited to performing only vacuum forming in the above suction step (suction unit 104), and may perform vacuum pressure air forming in which vacuum suction and pressure air are used in combination.

In addition, as shown in FIGS. 10A to 10D, holding pieces 80A, 80B, 80C, and 80D may be extended to one side edge of the side surface portion.
FIG. 10A shows an M-shaped holding piece 80A extending from the side edge 42A of the second side surface portion 32A toward the first side surface portion 31A in the paper container 1A.
FIG. 10B shows a triangular holding piece 80B extending from each of the side edges 43B of the third side surface portion 33B toward the first side surface portion 31B and the second side surface portion 32B in the paper container 1B. ..
FIG. 10C shows a trapezoidal holding piece extending from the side edge 42B of the second side surface portion 32B toward the first side surface portion 31B in addition to the holding piece 80B of (b) in the paper container 1B. Shows 80C.
FIG. 10D shows a triangular holding piece 80D extending from each of the side edges 43B of the third side surface portion 33B toward the first side surface portion 31B and the second side surface portion 32B in the paper container 1B. ..
The holding pieces 80A, 80B, 80C, and 80D can improve the connection strength between adjacent side surface portions.

1A, 1B Paper container 10A, 10B Container body 11A, 11B Opening 12A, 12B Bottom part 13 Side part 14 Side edge 15 Flange part 17 Fold 18 Fold 20 Film layer 31A, 31B First side surface part 32A, 32B Second Side surface 33B Third side surface 41A, 41B Side edge 42A, 42B Side edge 43B Side edge 50A, 50B Gap 51A, 51B Bending part 150 Molding mold 52 Recess 53 Surface part 54 First surface part 55 Second surface part 56 Flange surface part 57 Step 58 Air hole 60 Groove 61 Side groove 62 Bottom groove 63 Upper groove 64 Middle groove 70 Convex part

Claims (6)

Top forms the opening octagonal, erected folded at folds plurality of side portions extending from each side of the bottom portion of the eight triangular shape is along the sides of the bottom portion, adjacent the side portions A paper container body formed in a pyramidal shape in which the side edges extending from the bottom surface toward the opening are abutted to form a corner.
A film layer obtained by pressure-bonding a film sheet laminated on the inner surface of the container body is provided.
The container body is formed so that the side edges abutted at the corners are separated from each other and extend linearly between the bottom surface and the opening, and the corners of the bottom surface and the side edges are formed. It has a gap that is set to a dimension longer than the dimension that connects the upper end in a straight line.
The gap portion has a bent portion in which the gap portion is bent at an intermediate position between the bottom surface portion and the opening.
On the side surface
It is formed by a trapezoidal first region whose width narrows from the bottom surface toward the intermediate position and a trapezoidal second region connected to the first region and widens toward the opening. , A first side surface portion having the side edge bent in a dogleg shape,
Adjacent to the first side surface portion, a second side surface portion having the side edge bent in a shape suitable for the side edge of the first side surface portion is provided.
The gap portion is a paper container characterized in that the side edge is bent in a dogleg shape at the bent portion . A crease is provided between the first region and the second region on the first side surface portion, and a plurality of cuts are provided along the crease between the first region and the second region. The paper container according to claim 1 , wherein the paper container is formed intermittently. Top forms the rectangular opening, erected folded at folds plurality of side portions extending from each side of the bottom portion of the eight triangular shape is along the sides of the bottom portion, adjacent the side portions A paper container body formed in a pyramidal shape in which the side edges extending from the bottom surface toward the opening are abutted to form a corner.
A film layer obtained by pressure-bonding a film sheet laminated on the inner surface of the container body is provided.
The container body is formed so that the side edges abutted at the corners are separated from each other and extend linearly between the bottom surface and the opening, and the corners of the bottom surface and the side edges are formed. It has a gap that is set to a dimension longer than the dimension that connects the upper end in a straight line.
The gap portion has a bent portion in which the gap portion is bent at an intermediate position between the bottom surface portion and the opening.
The side surface portion is sandwiched between a first side surface portion and a second side surface portion in which the side edges are abutted with each other in a region from the opening to the intermediate position, and the first side surface portion and the second side surface portion. A third side surface portion having a triangular shape extending from the bottom surface portion to the intermediate position is provided.
The paper container is characterized in that the gap portion is branched into two at the bent portion from the opening toward the bottom surface portion along both side edges of the third side surface portion. The invention according to any one of claims 1 to 3 , wherein a plurality of notches are intermittently formed along the crease between each side of the bottom surface portion and the side surface portion. Paper container. Each of the plurality of side surface portions has a flange portion extending from the edge on the opening side to the side opposite to the opening.
The paper container according to any one of claims 1 to 4 , wherein the side edges of the flange portions are butted against each other. A blank sheet used for molding the container body of the paper container according to any one of claims 1 to 5.

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