JPH06329143A - Heat-insulating composite container material and container made thereof - Google Patents

Abstract

PURPOSE:To have appropriate rigidity, be excellent in heat insulation, apply a beautiful printed layer and be easily molded by a conventional container molding machine. CONSTITUTION:In a container material containing a heat-insulating layer in a cylindrical body, the cylindrical body material comprises an inner layer A made of converted paper with polyethylene 1 laminated on paper 2, a heat- insulating layer B made of a flexible heat-insulating material 4 and an outer layer C made of paper 5, while an adhesive layer 3 is provided on a side of the inner layer of the heat-insulating layer B, and also the heat-insulating layer B is made into a small size wherein a top curl part, a bottom adhesive part and a peripheral adhesive part on one of sides are eliminated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat insulating composite container material for containing foods and beverages and a container made of the material. More specifically, the present invention relates to a heat-insulating composite container material and a container which have appropriate rigidity, excellent heat insulation properties, can form a beautiful printing layer, and can be molded using a conventional container molding machine.

[0002]

2. Description of the Related Art As a conventional heat insulating composite container of this type,
A paper cup with a polyethylene layer laminated on the inner surface and a corrugated paper bonded to the outer peripheral surface of the body to form a heat insulating layer, and a pulp nonwoven fabric or a laminate of paper and paper on the outer peripheral surface of the paper cup. Bonded, vacuum polystyrene or pressure molded foamed polystyrene sheet into cup shape or bowl shape, so-called bead cup molded by heat-sealing foamed plastic beads, vacuum molded high impact polystyrene There is a so-called double cup in which cups are combined in an inner and outer double layer to form an air layer in the middle, and the air layer is used as a heat insulating layer.

[0003]

However, none of the above-mentioned conventional heat-insulating composite containers has a good printability or appearance on the outer peripheral surface of the body, and the corrugated paper is bulky. It is difficult to mold a non-woven fabric made of pulp or a laminate of foam and paper with a conventional container molding machine, and those using expanded polystyrene generate a large amount of black smoke when incinerated, There was a problem. An object of the present invention is to improve the conventional heat-insulating composite container and eliminate such problems.

[0004]

That is, the present invention is based on the first aspect.
In the container material enclosing the heat insulating layer in the tubular body, the tubular body material is composed of an inner layer made of processed paper obtained by laminating polyethylene on paper, an heat insulating layer made of a flexible heat insulating material, and an outer layer made of paper. In addition, an adhesive layer is provided on the inner layer side or the outer layer side of the heat insulating layer, and the heat insulating layer has a small size excluding the top curl portion, the bottom adhesive portion, and one or both peripheral edge adhesive portions. Secondly, a heat-insulating composite container material characterized by the above, and secondly, a heat-insulating composite container formed by molding and processing the above-mentioned tubular body material and bottom material.

An embodiment of the present invention will be described with reference to the drawings. 1 and 2 are schematic cross-sectional views for explaining a tubular body material for a heat insulating composite container of the present invention, and FIG. 3 is a development view of a fan-shaped piece obtained by cutting the tubular body material into a fan shape. Is. FIG. 1 shows an inner layer A made of polyethylene-processed paper obtained by laminating polyethylene 1 on a paper 2 from the inner surface (in the direction of the arrow), an adhesive layer 3 provided on the outer surface thereof, and a fan-shaped piece forming a container body. The peripheral portions of the three sides excluding the side surface temporary adhesion portion 6, that is, the side surface portion 7, the top curl portion 8 and the bottom portion adhesion portion 9
The heat insulating layer B (FIG. 3) partially overlapped with the flexible heat insulating material 4 having a size smaller than the above, and the outer layer C of the container 5 made of paper 5 are formed. 2 is the same as FIG.
The adhesive layer 3 is arranged on the heat insulating layer B side of the paper 5.

FIG. 4 is a schematic sectional view showing a bottom material for the heat insulating composite container of the present invention, and FIG. 5 is a top view of a circular piece cut out in a circular shape.

In these figures, the bottom material is a processed paper obtained by laminating polyethylene 1 on paper 2, and is composed only of the inner layer A of the tubular body material. Reference numeral 10 is a peripheral adhesive portion.

FIGS. 6 to 8 show another embodiment of the tubular body material for a heat insulating composite container according to the present invention.
In an example in which the heat insulating layer B partially overlapped with the flexible heat insulating material 4 having a slightly smaller size excluding the peripheral portion of the side, that is, the top curl portion 8, the bottom adhesive portion 9 and the side surface portions 7 and 11 is used. is there.

As the flexible heat insulating material 4 used as the heat insulating layer B in the present invention, a foamed sheet or a non-woven fabric made of polyethylene, polypropylene, soft polyurethane, soft vinyl chloride, steam-treated polystyrene or the like is preferably used. A polypropylene foam sheet is preferable because it is excellent in stretchability and heat resistance and can be easily disposed of, and its thickness is preferably about 0.5 to 2 mm. Since these foamed sheets are flexible and stretchable, the inner surface of the foamed sheet contracts and the outer surface expands when it is formed into a truncated cone shape. Further, in the present invention, since the heat insulating layer is not substantially adhered to the inner layer A and the outer layer C, it is not affected by the expansion and contraction of the foamed sheet during molding,
The foamed sheet does not have creases as in the case of forming an adhesive layer on one side or both sides of the foamed sheet and sanding it with paper, and it has a beautiful appearance and good printability.

By providing a plurality of cut grooves having a depth of at least ⅓ of the thickness of the heat insulating material on the inner layer side of the flexible heat insulating material in any one of the vertical, horizontal, and diagonal directions, or in two or more directions, You may make it relieve the shrinkage extension strain by bending at the time of shaping | molding. In this case, a particularly good result is obtained by a lattice shape combining vertical and horizontal and an oblique lattice shape combining oblique and diagonal.

The adhesive layer used in the present invention may be an extruded laminated layer or film of polyethylene, polypropylene or the like, or an adhesive.

The cylindrical body material of the present invention is formed into a truncated cone shape by joining both side surfaces of a fan-shaped piece, but at this time, the joining end portion is not displaced due to the difference in circumferential length of each layer. Each is punched to the pre-calculated dimensions. The punched fan-shaped piece has the side surface temporary adhesive portion 6 in the case of the fan-shaped piece shown in FIGS. 1 to 3, and the flexible heat insulating material 4 in the case of the fan-shaped piece shown in FIGS. 6 to 8. An arbitrary portion (center portion, end portion, etc.) that is overlapped is preliminarily adhered with an adhesive or a pressure-sensitive adhesive in advance, and is molded into a container together with the bottom material by a conventional container molding machine by a conventional method. Of course, also in the fan-shaped portion shown in FIGS. 1 to 3, any portion where the flexible heat insulating material 4 is overlapped may be temporarily bonded. Further, the temporary adhesion is preferably point adhesion or temporary adhesion with a short line segment in the longitudinal direction of the fan-shaped piece.

In the tubular body material of the present invention, since the flexible heat insulating material 4 does not exist in at least one of the top curl portion 8, the bottom adhesive portion 9 and the side surface portion, the bondable layer 3 and the paper 5 or the paper 2 are provided. Can be easily thermo-compression-sealed, both side surfaces of the fan-shaped part can be joined, the top curl part can be easily formed, and the tubular body part and the bottom part can also be easily joined. It is possible. Depending on the purpose of use, the bottom material may be the inner layer A, the heat insulating layer B, and the outer layer C in the same manner as the cylindrical body material.
It may be configured by layers. The heat-insulating composite container obtained as described above has a structure in which a heat-insulating layer exists in the tubular body except for the top curl portion, the bottom adhesive portion, and the side adhesive portion, and has appropriate rigidity and excellent heat insulation. It is possible to apply a beautiful printing layer having properties.

[0014]

EXAMPLES Hereinafter, the present invention will be described in more detail with reference to examples, but the present invention is not limited thereto. Example 1 A polyethylene-processed paper obtained by laminating polyethylene 1 and 3 on each side of bleached kraft paper 2 (basis weight: 120 g / m ² ) in an amount of 15 μm each was prepared into a fan shape for a cylindrical body as shown in FIG. Cut out. On the other hand, it was cut out into a circular shape for the bottom as shown in FIG. In this case, polyethylene 1 is the innermost layer and polyethylene 3 is the bondable layer.

Next, a foamed polypropylene sheet (basis weight: 33 g / m ² ) having a thickness of 1 mm was prepared as a flexible heat insulating material 4 serving as a heat insulating layer, and this was cut out into a fan shape for a cylindrical body (FIG. 3). reference). At this time, the dimensions of the flexible heat insulating material 4 were 10 mm smaller at the top curl portion 8, 14 mm at the bottom adhesive portion 9, and 7 mm at the side end portion 7 than the dimensions of the polyethylene-treated paper for the inner layer. The size of the circular piece for the bottom part is 8 mm smaller than the size of the polyethylene-processed paper for the inner layer, that is, the diameter is 16 mm smaller. Further, prepare the same bleached kraft paper 5 as the outer layer, and for the cylindrical body, calculate the deviation from the inner layer when it is formed into a truncated cone shape,
When cutting out into a fan shape, the dimension between both ends was made 5 mm larger than the dimension of polyethylene-coated paper for the inner layer.

The stacking material prepared as described above was arranged as shown in FIGS. 3 and 5, and part of the side surface temporary adhesive portion 6 of the fan-shaped piece was adhered with an adhesive. This temporary adhesion material was molded into a truncated cone shape using a conventional container molding machine so that one layer of polyethylene was inside the container, and both sides were heat-sealed to form a tubular body. Then, a top curl was applied, and on the other hand, the cylindrical body and the bottom were heat-sealed by an ordinary method to produce a heat-insulating composite container.

The heat-insulating composite container thus obtained is
It can be molded using a conventional container molding machine, has excellent rigidity and heat insulation without wrinkles in the body, that is, it is not hot when pouring hot water into the hand and it is stiff. The printability and appearance of the outermost layer were excellent.

COMPARATIVE EXAMPLE 1 In Example 1, the dimensions of the fan-shaped piece and the circular-shaped piece of the flexible heat insulating material 4 and the bleached kraft paper 5 of the outer layer were made the same as the dimensions of the polyethylene-treated paper for the inner layer, and the fan to be the body portion was formed. Except that one end of the shape piece is thermo-compression-sealed in advance to temporarily bond it, and the top curl portion and bottom adhesion portion of the fan-shaped piece and the entire circumference of the circular piece are thermo-compression-sealed in advance to make them thin. Example 1
A heat insulating composite container was obtained in the same manner as in.

The heat insulating composite container thus obtained is
It had excellent rigidity and heat insulation without any wrinkles on the body, and had good printability and appearance, but it also had a cylindrical body heat-sealing part, top curl part and bottom adhesive part, and moreover a circular shape. Since the flexible heat insulating material layer is also provided on the peripheral edge bonded part of the shaped piece, even if these parts are thinned by thermocompression bonding in advance, it is difficult to mold with a conventional container molding machine. Occurred, causing a decrease in production efficiency.

[0020]

As described above, according to the present invention, it is possible to apply a beautiful printing layer having appropriate rigidity, excellent heat insulation, and can be manufactured by a conventional container molding machine. A suitable heat insulating composite container material and container can be provided.

[Brief description of drawings]

FIG. 1 is a schematic sectional view for explaining a material for a tubular body portion of the present invention.

FIG. 2 is a schematic cross-sectional view for explaining the material of the tubular body portion of the present invention.

FIG. 3 is a development view of a fan-shaped piece of tubular body material.

FIG. 4 is a schematic sectional view for explaining the bottom material of the present invention.

FIG. 5 is an exploded view of a circular piece of bottom material.

FIG. 6 is an explanatory schematic cross-sectional view showing another example of the tubular body material.

FIG. 7 is a schematic sectional view for explaining another example of the tubular body material.

FIG. 8 is a development view of a fan-shaped piece showing another example of the tubular body material.

[Explanation of symbols]

 1 Polyethylene film 2 Paper 3 Adhesive layer 4 Flexible heat insulating material 5 Paper 6 Side temporary adhesive part 7 Side part 8 Dopp curl part 9 Bottom adhesive part 10 Perimeter adhesive part 11 Side part A Inner layer B Insulating layer C Outer layer

Claims (4)

[Claims] 1. A container material containing a heat insulating layer in a tubular body, wherein the material of the tubular body comprises an inner layer made of processed paper obtained by laminating polyethylene on paper, a heat insulating layer made of a flexible heat insulating material, and paper. An outer layer, which is provided with a bondable layer on the inner layer side or outer layer side of the heat insulating layer, and the heat insulating layer has a small size excluding a top curl portion, a bottom adhesive portion, and one or both peripheral edge adhesive portions of the side surface portion. A heat-insulating composite container material characterized in that 2. The heat insulating composite container material according to claim 1, wherein the flexible heat insulating material is made of expanded polypropylene. 3. The flexible heat insulating material is provided with a notch groove having a depth of at least 1/3 of the thickness of the heat insulating material on the inner layer side.
Or the heat insulating composite container material according to 2. 4. An adiabatic composite container obtained by molding the tubular body material according to claim 1 and a bottom material.