JP3633286B2 - Paper insulated container - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a paper heat insulating container having a high degree of freedom in shape, in which a thermoplastic resin film is in close contact with the entire inner surface of a container formed by bending a single blank.
[0002]
[Prior art]
Conventionally, as a paper heat-insulating container for pouring hot water into a container such as instant noodles, for example, corrugated paper is attached to the outside of the peripheral wall of a paper cup body subjected to water resistance processing, After forming a coating film of thermoplastic resin such as foaming ink on the peripheral wall of a paper cup, a container in which thin paper is pasted to form an air insulation layer, the coating film is foamed by heating or the like to form a foam layer Containers are known.
[0003]
However, these heat insulating containers use paper cups, and only the regular shape can be manufactured in the manufacture of the paper cups. For example, a bowl-shaped container whose peripheral wall is gradually inclined cannot be manufactured.
[0004]
[Problems to be solved by the invention]
The present invention has been made paying attention to the above problems, and an object of the present invention is to provide a paper heat insulating container having a bowl shape with a high degree of freedom in shape, in particular, a peripheral wall inclining stepwise.
[0005]
[Means for Solving the Problems]
In order to achieve the above object, first, in the invention according to claim 1, the thermoplastic resin film has a shape along the inner surface of the paper container on the inner surface of the flanged paper container assembled by folding a single blank. A paper insulated container that is molded and in close contact with the flanged paper container, wherein the bottom plate is an even polygon that is a hexagon or more, and the outer side is inside each fold line of the bottom plate. A bottom side plate having a trapezoidal shape wider than the side and parallel to the mountain fold line and equidistant from the center of the bottom plate in parallel with a valley fold line is continuously provided. A trapezoidal first lower side plate and a second lower side plate, which are wider outside than the inner side through the fold line, are alternately connected to each other, and the upper end of the first lower side plate is outside through the valley fold line. A trapezoidal first side plate that is wider than the inner side is continuously provided, and a mountain fold line is provided at the upper end of the first side plate. First flanges with ear pieces extending to the left and right ends are connected to each other, and substantially triangular first bent pieces are connected to the left and right ends of the first side plate via valley fold lines. A second side plate having a trapezoidal shape, the outer side being wider than the inner side, is connected to the upper end of the face plate via a valley fold line, and tongue pieces are connected to the left and right ends via a valley fold line. A second flange is connected to the upper end of the side plate via a mountain fold line, and a substantially triangular second bent piece is connected to the left and right ends via a valley fold line. The edge that is not in contact with the side surface plate and the edge that is not in contact with the second side surface plate of the second folded piece are the bottom side surface plate, 1 lower side plate, 2nd lower side plate, 1st side plate, and 2nd side plate are folded up in order, and the inner surface of the 1st side plate and the inner surface of the 1st bending piece are piled up Become assembled Te Unishi, the inner surface of the flanged container, the thermoplastic resin film is a paper insulated container which is in close contact is molded into a shape along the inner surface of the paper container.
[0006]
According to a second aspect of the present invention, in the first aspect of the invention, instead of overlapping the inner side surface of the first side plate and the inner side surface of the first bent piece , the blank is arranged in the second side plate. This is a paper insulated container assembled into a flanged container so that the side surface and the inner side surface of the second bent piece overlap.
[0007]
Here, in particular, the blank material is made of embossed paper alone, corrugated paper alone, foamed plastic sheet alone, or laminated paper in which thin paper is attached to one or both sides of the single material.
[0008]
Further, the blank material is made of a paperboard in which a foam layer is laminated, or a laminated paper in which a thin paper is stuck on the foam layer side of the paperboard in which the foam layer is laminated.
[0009]
Here, the valley fold line and the mountain fold line mean that when a blank is processed, it is simply processed as a fold line, that is, a ruled line, and when folded into a container, it is a valley fold and a mountain fold, respectively. To do.
[0010]
[Action]
As described above, the paper heat insulating container of the present invention is formed by folding a single blank and assembling it, so that a container whose side surface is inclined stepwise can be produced.
In addition, since the first side plate and the first bent piece, or the second side plate and the second bent piece are overlapped to form a box, the left and right ends of the bottom side plates come into contact with each other so that the bottom plate floats. It is formed.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described in detail by way of examples.
For example, as shown in FIG. 1, the paper heat insulating container of the present invention has a shape along the inner surface of the paper container 10 and the thermoplastic resin film 20 on the inner surface of the flanged paper container 10 that is assembled by folding a single blank 2. Molded and closely attached.
[0012]
As shown in FIG. 2, the flanged paper container 10 has an even polygon (an octagon in the drawing) whose bottom plate 11 is a hexagon or more, and is attached to each side of the mountain fold line b of the bottom plate 11. A bottom side plate 12 having a trapezoidal shape wider than the inner side and parallel to the mountain fold line b and provided with a valley fold line a in parallel at an equal distance from the center of the bottom plate is connected.
[0013]
At the upper end of each bottom side plate 12, trapezoidal first lower side plates 13 and second lower side plates 14 that are wider outward than the inner sides are alternately connected via valley fold lines a.
[0014]
A trapezoidal first side plate 15 whose outer side is wider than the inner side is connected to the upper end of the first lower side plate 13 via a valley fold line a.
[0015]
At the upper end of the first side plate 15, a first flange 16 having ear pieces 161 extending from the left and right ends via a mountain fold line b is provided continuously, and at the left and right ends of the first side plate 15, a valley fold line a is provided. A first bent piece 151 having a substantially triangular shape is continuously provided via the.
[0016]
A trapezoidal second side plate 17 whose outer side is wider than the inner side is connected to the upper end of the second lower side plate 14 via a valley fold line a, and a valley fold line a is connected to the left and right ends. The tongue piece 141 is continuously provided.
[0017]
A second flange 18 is connected to the upper end of the second side plate 17 via a mountain fold line b, and a substantially triangular second bent piece 171 is connected to 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 end edge of the second bent piece 171 that is not in contact with the second side plate 17 are connected via a mountain fold line b. Are connected.
[0018]
The blank 2 is placed on a female mold of a general box making machine and boxed together with the male mold to produce a paper container 10 with a flange.
At this time, the inner surface of the first side plate 15 and the inner surface of the first bent piece 151 may be stacked to make a box, or the inner surface of the second side plate 17 and the inner surface of the second bent piece 171 may be stacked. You may make a box in this way. Moreover, you may make it adhere | attach using an adhesive agent and it may just be piled up.
[0019]
The edge of the bottom side plate 12 in the left-right direction is close to the edge of the adjacent bottom side plate 12 in the left-right direction, and the bottom plate 11 is boxed in a lifted state.
[0020]
Since the material used for the blank needs to have a heat insulating effect, embossed paper, corrugated paper, foamed plastic sheet, paperboard laminated with foamed layers, etc. can be suitably used, and thin paper on one or both sides of these single materials It is good also as the laminated paper which laminated | stacked.
[0021]
The thermoplastic resin film 20 can be 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.
[0022]
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. A preheated thermoplastic resin film 20 is guided onto this, the thermoplastic resin film is pressed around the paper container, the inside of the female mold is decompressed, and the thermoplastic resin film is sucked and adhered to the inner surface of the paper container. Finally, after the thermoplastic resin film is cooled, the film protruding to the outside of the paper container is cut out to produce the paper heat insulating container 1 of the present invention.
[0023]
In addition, if a so-called hot-melt type adhesive that is activated by heat is applied in advance to the inner surface of the paper container, the thermoplastic resin film is more securely adhered.
[0024]
The thermoplastic resin film 20 can be deep-drawn and heat-sealable, and considering recent hygiene issues, for example, polyethylene, polypropylene (homotype polypropylene, random type polypropylene copolymer, block type polypropylene co-polymer). Polymer, etc.), ethylene-vinyl acetate copolymer, polyester film or the like, or composite films thereof can be suitably used.
[0025]
Moreover, the thickness of a film should just have thickness which is not damaged at the time of shaping | molding, and the thickness before shaping | molding is about 50-300 micrometers, Preferably about 100-200 micrometers can be used conveniently.
[0026]
【Example】
Examples of the present invention will be described more specifically below.
<Example 1>
First, embossed paper in which 7 mm / cm ² of semicircular projections having a diameter of 3.6 mm and a depth of 1.8 mm were distributed on bleached kraft paper having a basis weight of 120 g / m ² was produced.
A pure white roll paper having a basis weight of 30 g / m ² was laminated on both sides of this embossed paper via a vinyl acetate resin emulsion adhesive to produce a blank sheet for producing a paper container with a flange.
[0027]
The blank sheet was cut into a predetermined size, and a blank 2 for a paper container was produced by a punching process using a generally used punching die according to the above-described method (see FIG. 2).
[0028]
The blank 2 was placed on a female mold of a general box making machine and boxed together with the male mold to make a paper container 10 with a flange.
At this time, the box was made so that the inner side of the first side plate 15 and the inner side 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. The overlapping surface of the second flange 18 and the ear piece 161 of the first flange 16 was also attached with a vinyl acetate resin adhesive.
[0029]
Next, a homo-type polypropylene film having a thickness of 100 μm is prepared as the thermoplastic resin film 20, and in close contact with the inner surface of the separately prepared flanged paper container 10 according to the above-described method, it protrudes outside the paper container. The insulated film 1 of Example 1 was produced by cutting off the film.
A hot melt adhesive was applied in advance to the inner surface of the paper container to enhance the adhesion between the inner surface of the paper container and the thermoplastic resin film.
[0030]
<Example 2>
The same material as in Example 1, except that the inner side of the second side plate 17 and the inner side of the second bent piece 171 are stacked instead of the inner side of the first side plate 15 and the inner side of the first bent piece 151. By the method, the paper insulated container of Example 2 was produced (detailed explanation is omitted).
[0031]
In order to evaluate the heat insulation effect of the two types of paper insulation containers made in this way, after putting instant noodles in the container and pouring hot water and leaving it for 3 minutes, the bottom and sides of the container were held with fingers and palms. I couldn't hold it.
[0032]
【The invention's effect】
As described above, the paper heat insulating container of the present invention is manufactured by assembling a single blank, and therefore, unlike a paper cup or the like, it has a high degree of freedom in shape, for example, even a bowl-shaped container whose side surface is inclined stepwise is easy. Can be made.
Further, since the bottom plate is raised, even if a container is placed on the palm, the contact area is small and the heat insulation effect is high.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view illustrating an embodiment of a paper heat insulating container according to the present invention.
FIG. 2 is a configuration explanatory diagram of a paper container blank constituting the paper heat insulating container shown in FIG. 1;
[Explanation of symbols]
DESCRIPTION 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 ... 1st flange 17 ... 2nd side plate 18 ... 2nd flange 20 ... thermoplastic resin film 141 ... tongue piece 151 ... 1st bent piece 161 ... ear piece 171 ... 2nd bent piece a ... Valley fold line b ... Mountain fold line

Claims (6)

A paper heat insulating container in which a thermoplastic resin film is molded and adhered in a shape along the inner surface of the paper container on the inner surface of the flanged paper container assembled by folding one blank,
The flanged paper container has an even polygon of a hexagonal shape or more on the bottom plate, and has a trapezoidal shape with the outer side wider than the inner side on each side of the mountain fold line of the bottom plate, and a bottom parallel to the mountain fold line. A bottom side plate with a valley fold line is provided in parallel at equal distances from the center of the face plate, and the top of each bottom side plate is trapezoidal with the outside wider than the inside via the valley fold line The first lower side plate and the second lower side plate are alternately connected to each other, and a trapezoidal first side plate whose outer side is wider than the inner side through a valley fold line at the upper end of the first lower side plate. The first side plate is provided with a first flange having a left and right end extending from the left and right ends through a mountain fold line at the upper end of the first side plate, and a valley fold line is provided at the left and right ends of the first side plate. A substantially triangular first bent piece is continuously provided, and a trapezoidal second side plate having an outer width wider than the inner side is continuously provided at the upper end of the second lower side plate via a valley fold line, A tongue piece is connected to the right end via a valley fold line, a second flange is connected to the upper end of the second side plate via a mountain fold line, and the left and right ends are substantially triangular via a valley fold line. A second bent piece having a shape is continuously provided, and an end edge of the first bent piece that is not in contact with the first side plate and an end edge of the second bent piece that is not in contact with the second side plate are: Folding the blank connected continuously through the mountain fold line, the bottom side plate, the 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 assembled to overlap the inner surface of the first bent piece,
A heat insulating container made of paper, wherein a thermoplastic resin film is molded and adhered to the inner surface of the flanged container in a shape along the inner surface of the paper container. The blank was assembled into a flanged container so that the second side plate and the inner side surface of the second bent piece were overlapped instead of overlapping the inner side surface of the first side plate and the inner side surface of the first bent piece. The paper insulated container according to claim 1. The paper insulation container according to claim 1 or 2, wherein the blank material is a single embossed paper or a laminated paper in which a thin paper is attached to one or both sides of the embossed paper. The paper insulation container according to claim 1 or 2, wherein the blank is made of corrugated paper alone or laminated paper having thin paper pasted on one or both sides of the corrugated paper. The paper insulation container according to claim 1 or 2, wherein the blank material is made of a foamed plastic sheet alone or a laminated paper in which thin paper is attached to one or both sides of the foamed plastic sheet. 3. The paper insulation according to claim 1 or 2, wherein the blank material is made of a paperboard in which a foam layer is laminated, or a laminated paper in which a thin paper is adhered to the foam layer side of the paperboard in which the foam layer is laminated. container.

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