JPH11349065A - Heat-insulating container made of paper - Google Patents

Abstract

PROBLEM TO BE SOLVED: To form a bowl-shaped heat-insulating container made of paper having a high degree of freedom in shape especially with a peripheral wall gradually inclined with a floating bottom plate by folding a single blank to assemble a paper container with a flange and tightly attaching a thermoplastic resin film to its internal face. SOLUTION: A paper container with a flange assembled by folding a single blank 2 comprises bottom side plates 12 connected around a polygonal bottom plate 11 via acute-angled creases (a) and obtuse-angled creases (b), a plurality of lower side plates 13, 14 and a plurality of side plates 15, 17 similarly connected successively around them, and a plurality of flanges 16, 18 and folding pieces 151, 171 connected to their upper end and both side ends. At this time, the container is made by overlaying internal faces of the side plate 15 and the folding piece 151. In addition, both side end rims of the adjacent bottom side plates 12 are brought close to each other to cause the bottom plate 11 to rise. A thermoplastic resin is tightly attached to an internal face of the paper container to provide the heat-insulating container made of paper.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a paper-made heat-insulating container having a high degree of freedom in shape, in which a thermoplastic resin film is adhered to the entire inner surface of a container formed by bending a single blank.

[0002]

2. Description of the Related Art Conventionally, as a paper heat insulation container for pouring hot water into a container such as instant noodles and eating it, for example, a corrugated paper is adhered to the outside of a peripheral wall of a paper cup body subjected to a water-resistant treatment. After forming a coating film of a thermoplastic resin such as foaming ink on the peripheral wall of a container or a paper cup on which a thin paper is stuck on a corrugated paper to form an air heat insulating layer, the coating film is foamed by heating or the like. Containers and the like in which a foam layer is formed are known.

However, these heat-insulating containers use paper cups, and therefore, in the production of paper cups, only fixed-size containers can be manufactured. For example, bowl-shaped containers whose peripheral walls are gradually inclined cannot be manufactured. .

[0004]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and is a bowl-shaped paper heat-insulating container having a high degree of freedom in shape, particularly, a peripheral wall which is gradually inclined. The purpose is to provide.

[0005]

In order to achieve the above object, according to the first aspect of the present invention, a thermoplastic resin film is formed on the inner surface of a flanged paper container assembled by bending a single blank. Is a paper heat insulating container which is molded and adhered to the shape along the inner surface of the paper container, wherein the flanged paper container has an even polygon whose bottom plate is a hexagon or more, and a mountain fold line of the bottom plate. On each side, a bottom side plate having a trapezoidal shape in which the outer side is wider than the inner side and a valley fold line provided in parallel with the mountain fold line and at the same distance from the center of the bottom plate is provided in series. At the upper end of the bottom side plate, trapezoidal first lower side plates and second lower side plates that are wider outward than the inner side are alternately provided via a valley fold line, and the upper end of the first lower side plate is provided. Is provided with a trapezoidal first side plate which is wider on the outside than on the inside through a valley fold line, First flange ear pieces extending in the right and left ends at the upper end of the plate through the mountain fold line is continuously provided, first
At the left and right ends of the side plate, a substantially triangular first
Folded pieces are continuously provided, and a trapezoidal second side plate that is wider outward than the inside through a valley fold line is continuously provided at the upper end of the second lower side plate. A tongue piece is continuously provided via a ridge line, a second flange is provided at the upper end of the second side plate via a mountain fold line, and a substantially triangular second bent piece is provided at the left and right ends via a valley fold line. An end of the first bent piece that is not in contact with the first side plate;
With the edge that is not in contact with the side plate, a blank continuously provided via a mountain fold line is used as a bottom side plate, a first lower side plate,
The second lower side plate, the first side plate, and the second side plate are sequentially folded, and the inner side surface of the first side plate and the inner side surface of the first bent piece are assembled so as to overlap with each other. This is a paper heat insulating container in which a thermoplastic resin film is molded and adhered to the inner surface in a shape along the inner surface of the paper container.

According to a second aspect of the present invention, in the first aspect of the present invention, the blank is provided with a flange so that an inner surface of a second side plate and an inner surface of a second bent piece are overlapped. This is a paper heat insulation container assembled in the above.

[0007] In particular, the blank material is composed of embossed paper alone, corrugated paper alone, foamed plastic sheet alone, or laminated paper in which thin paper is adhered to one or both sides of the single material.

Further, the blank material is made of a paperboard having a foam layer laminated thereon, or a laminated paper having a thin paper adhered to the foam layer side of the paperboard having the foam layer laminated thereon.

Here, the valley fold line and the mountain fold line are
When the blank is processed, the blank is simply processed as a folding line, that is, a ruled line, and when the blank is folded to form a container, the blank and the mountain are respectively folded.

[0010]

As described above, since the paper heat insulating container of the present invention is formed by folding a single blank and assembling it, it is possible to manufacture a container whose side surfaces are inclined stepwise. Also, the first
Since the side plate and the first bent piece, or the second side plate and the second bent piece are overlapped to make a box, the left and right ends of the bottom side plates come into contact with each other, so that the bottom plate is raised.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to embodiments. As shown in FIG. 1, for example, the paper heat insulating container of the present invention includes a thermoplastic resin film 2 on the inner surface of a flanged paper container 10 which is assembled by bending a single blank 2.
No. 0 is molded into a shape along the inner surface of the paper container and closely adhered thereto.

As shown in FIG. 2, the bottomed paper container 10 has an even polygon (octagon in the drawing) whose bottom plate 11 is hexagonal or more. In addition, a bottom side plate 12 having a trapezoidal shape having a wider outer side than the inner side and having a valley fold line a provided in parallel with the mountain fold line b and at the same distance from the center of the bottom plate is provided. .

At the upper end of each bottom side plate 12, a valley fold line a
The first lower side plates 13 and the second lower side plates 14 each having a trapezoidal shape whose outer side is wider than the inner side are alternately provided.

At the upper end of the first lower side plate 13, a trapezoidal first side plate 15 whose outside is wider than the inside through a valley fold line a.
Are connected.

At the upper end of the first side plate 15, a first flange 1 having ear tabs 161 extending to the left and right ends via a mountain fold line b.
6, a substantially triangular first bent piece 151 is continuously provided at the left and right ends of the first side plate via a valley fold line a.

At the upper end of the second lower side plate 14, a trapezoidal second side plate 1 whose outside is wider than its inside through a valley fold line a.
7 are continuously provided, and the tongue piece 1 is provided at the left and right ends through a valley fold line a.
41 are provided in series.

A second flange 18 is continuously provided at the upper end of the second side plate 17 via a mountain fold line b, and a substantially triangular second bent piece 171 is provided at the left and right ends via a valley fold line a. The edge of the first bent piece 151 that is not in contact with the first side plate 15 and the edge of the second bent piece 171 that is not in contact with the second side plate 17 are mountain fold lines. b.

The blank 2 is placed on a female die of a general box making machine, and is boxed together with a male die to produce a paper container 10 with a flange. At this time, the inner side surface of the first side plate 15 and the inner surface of the first bent piece 151 may be made into a box so as to overlap each other, or the inner surface of the second side plate 17 and the second bent piece 1 may be formed.
The inner box 71 may be boxed so as to overlap the inner surface. In addition, they may be bonded using an adhesive, or may be merely stacked.

The left and right edges of the bottom side plate 12 are close to the left and right edges of the adjacent bottom side plate 12, and the bottom plate 11 is boxed in a floating state.

Since the material used for the blank must have a heat insulating effect, embossed paper, corrugated paper, foamed plastic sheet, paperboard laminated with a foamed layer and the like can be suitably used. Laminated paper in which thin paper is laminated on both sides may be used.

The thermoplastic resin film 20 can be easily brought into close contact with the inner surface of the flanged paper container 10 by a vacuum forming method or a combination of a vacuum forming method and a pressure forming method.

For example, first, the paper container 10 is loaded into a female mold having a recess substantially the same as the outer shape of the paper container. The thermoplastic resin film 20 which has been heated in advance is guided thereon, the thermoplastic resin film is pressed around the paper container, and the inside of the female mold is depressurized to bring the thermoplastic resin film into close contact with the inner surface of the paper container. Finally, after cooling the thermoplastic resin film, the film protruding outside the paper container is cut off to produce the paper heat insulating container 1 of the present invention.

If a so-called hot-melt type adhesive activated by heat is applied to the inner surface of the paper container in advance, the adhesion of the thermoplastic resin film becomes more reliable.

The thermoplastic resin film 20 is capable of deep drawing and heat sealing, and considering recent hygiene problems, for example, polyethylene, polypropylene (homo-type polypropylene, random-type polypropylene copolymer, block A film such as a type polypropylene copolymer), an ethylene-vinyl acetate copolymer, a polyester, or a composite film thereof can be suitably used.

Further, the thickness of the film may be such that it does not break during molding.
Those having a thickness of about 0 to 300 μm, preferably about 100 to 200 μm can be suitably used.

[0026]

EXAMPLES Examples of the present invention will be described below more specifically. <Example 1> First, to prepare the embossed paper diameter 3.6 mm, projections of semicircular depth 1.8mm was 7 / cm ² distributed bleached kraft paper having a basis weight of 120 g / m ^2. Pure white roll paper having a basis weight of 30 g / m ² was laminated on both sides of the embossed paper via a vinyl acetate resin-based emulsion-type adhesive to prepare a blank sheet for producing a paper container with a flange.

The blank sheet is cut into a predetermined size,
In addition, according to the method described above, a blank 2 for a paper container was produced in a punching step using a commonly used punching die (see FIG. 2).

The blank 2 is placed on a female die of a general box making machine, and is boxed together with the male die.
0 was set. At this time, the box was formed so that the inside of the first side plate 15 and the inside of the first bent piece 151 overlapped. The overlapping surface of the first side plate 15 and the first bent piece 151 was attached with a vinyl acetate resin adhesive. Second flange 18
The overlapping surface of the ear piece 161 of the first flange 16 was also adhered with a vinyl acetate resin adhesive.

Next, as the thermoplastic resin film 20,
A homo-type polypropylene film having a thickness of 100 μm was prepared, adhered to the inner surface of the separately prepared flanged paper container 10 according to the above-described method, and the film protruding outside the paper container was cut off to obtain the film of Example 1. A heat insulating container 1 made of paper was produced. A hot melt adhesive was applied to the inner surface of the paper container in advance to increase the adhesion between the inner surface of the paper container and the thermoplastic resin film.

<Embodiment 2> The inside of the first side plate 15 and the first
The same material and method as in Example 1 except that the inside of the second side plate 17 and the inside of the second bent piece 171 are overlapped instead of overlapping with the inside of the bent piece 151, and the paper insulation of Example 2 is used. A container was prepared (detailed description is omitted).

In order to evaluate the heat insulating effect of the two types of paper-made heat insulating containers thus prepared, instant noodles were poured into the container, poured into hot water and allowed to stand for 3 minutes, and the bottom and side surfaces of the container were grasped with fingers or palms. It wasn't too hot to hold.

[0032]

As described above, the paper-made heat insulating container of the present invention comprises:
Since one blank is assembled and manufactured, unlike a paper cup or the like, it has a high degree of freedom in shape, and for example, a bowl-shaped container whose side surface is inclined stepwise can be easily manufactured. Further, since the bottom plate is raised, even if the container is placed on the palm, the contact area is small and the heat insulating effect is high.

[Brief description of the drawings]

FIG. 1 is an explanatory view showing a cross section of an embodiment of a paper heat insulating container of the present invention.

FIG. 2 is a configuration explanatory view of a blank of a paper container constituting the heat insulating container made of paper shown in FIG. 1;

[Explanation of symbols]

 1 Paper insulation container 2 Blank 10 Paper container 11 Bottom plate 12 Bottom side plate 13 First lower side plate 14 Second lower side plate 15 First side plate 16 First flange 17 Second side plate 18 Second flange 20 Thermoplastic resin film 141 Tongue piece 151 First bent piece 161 Ear piece 171 Second bent piece a ‥‥ valley fold line b ‥‥ mountain fold line

Claims (6)

[Claims] 1. A paper heat insulating container, wherein a thermoplastic resin film is molded and adhered to an inner surface of a flanged paper container formed by bending a single blank and assembled along the inner surface of the paper container, In the flanged paper container, the bottom plate has an even polygon shape of a hexagon or more, and each side of the mountain fold line of the bottom plate has a trapezoidal shape in which the outside is wider than the inside and the bottom is parallel to the mountain fold line. Bottom side plates provided with valley fold lines in parallel at equal distances from the center of the face plate are connected in series. At the top of each bottom side plate, the outside is wider and trapezoidal on the outside through the valley fold line. A first lower side plate and a second lower side plate are alternately connected to each other, and a trapezoidal first side plate that is wider on the outside than on the inside through a valley fold line is provided at the upper end of the first lower side plate. A first flange is provided at the upper end of the first side plate and has ear tabs extending to the left and right ends via a mountain fold line. ,
At the left and right ends of the first side plate, a first triangular bent piece is continuously provided via a valley fold line, and at the upper end of the second lower side plate, the outside is wider than the inside via a valley fold line. , A tongue piece is continuously provided at the left and right ends via a valley fold line, and a second flange is provided at the upper end of the second side plate via a mountain fold line. A substantially triangular second bent piece is continuously provided on the left and right ends via a valley fold line, and an edge of the first bent piece that is not in contact with the first side plate and a second bent piece of the second bent piece. With the edge not in contact with the two side plates, a blank continuously provided through a mountain fold line is used to form a bottom side plate, a first lower side plate, a second lower side plate, a first side plate, and a second side plate. The side plate is sequentially folded up, and the inner surface of the first side plate and the inner surface of the first bent piece are assembled so as to overlap with each other. Characterized in that a thermoplastic resin film is formed in a shape along the inner surface of the paper container and is closely adhered to the paper container. 2. The paper insulation container according to claim 1, wherein the blank is assembled into a flanged container such that the inner surface of the second side plate and the inner surface of the second bent piece are overlapped. . 3. The paper insulation according to claim 1, wherein the blank material is made of embossed paper alone or laminated paper having thin paper adhered to one or both sides of the embossed paper. container. 4. The paper insulation container according to claim 1, wherein the blank material is made of a single piece of corrugated paper or a laminated paper in which thin paper is adhered to one or both sides of the corrugated paper. 5. The paper insulation according to claim 1, wherein the blank is made of a foamed plastic sheet alone or a laminated paper in which thin paper is adhered to one or both sides of the foamed plastic sheet. container. 6. The blank according to claim 1, wherein the blank is made of a paperboard having a foam layer laminated thereon, or a laminated paper having a thin paper adhered to the foam layer side of the paperboard having the foam layer laminated thereon.
Or the paper-made heat-insulating container of 2