JPH06219474A - Cup container and manufacture thereof - Google Patents

Abstract

PURPOSE:To easily burn a cup for food such as miso soup which is eaten with hot water put and realize good stacking ability of the cup container body to save a space during storage, transportation, etc. CONSTITUTION:An outer cup 10 is formed with an engaging part 11 on an opening edge of the upper rim and with a bottom rim 12 at the lower end. The outer cup 10 is formed by adhering paper with a polyethylene film laminated. An outer face 21 of a body of an inner cup 20 is fitted into an inner face of the body of the outer cup 10, and an outer face 22 of the bottom is fitted into an inner face 14 of the bottom of the outer cup 10, respectively, so that they are approximately tight. A clamp part 23 clamps the engaging part 11 to have the inner cup 20 fixed to the outer cup 10. The inner cup 20 is formed in a double-layered structure with heat shrinkability comprising a layer with polypropylene laminated inside and an outer layer with talc mixed into polypropylene by 50%.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cup container having an adiabatic property for foods such as instant cup ramen and curry, which are heated by pouring hot water or by heating in a microwave oven.

[0002]

2. Description of the Related Art Conventionally, cup containers having this type of heat insulation are dombri udon, instant cup noodles,
It has been developed for products such as instant miso soup that is poured by boiling water to eat, and resin cups such as foamed polystyrene are the mainstream.

There is also a container having a double structure, for example, as shown in FIG. 4, an outer cup 31 made of paper material,
The outer cup 31 includes an inner cup 33 provided inside the outer cup 31 with a gap 32 therebetween.

[0004]

The cup container made of expanded polystyrene or the like as described above is used up to a boiling point of water under normal pressure or lower and cannot be used in a microwave oven. In addition, since it is made of resin only, a combustion heat value of about 10,000 to about 11,000 kcal / kg is generated during incineration, and when polystyrene resin is used, black smoke is emitted during incineration and it is difficult to completely burn. there were. Further, since it is formed of foamed resin, it must be formed to be thick to some extent in order to have strength, and as a result, the stacking property deteriorates, so the transport amount and storage amount per volume is small, Moreover, the area exposed to the outside air was large and it was easily polluted.

In addition, since the cup container having the above-mentioned double structure requires a gap as a heat insulating layer, the thickness of the cup container body becomes large, and the stacking property is poor as shown in FIG. Therefore, there is the same problem as in the case of the foamed resin cup container described above.

The present invention solves the above problems, has a heat insulating property and can be easily incinerated, and has a good stacking property of the cup container body, which saves space during storage, transportation, etc. It is an object of the present invention to provide a cup container body that is hard to be damaged.

[0007]

The present invention has been made to achieve the above object, and the cup container of the present invention is
It is characterized in that it has an outer cup formed mainly of paper, and an inner cup formed in the inside of the outer cup in a substantially intimate contact state so as to have heat shrinkability.

The inner cup has heat-shrinkability and shrinks when filled with hot water or heated by a microwave oven or the like. In order to form the inner cup in a heat-shrinkable state, the orientation (biaxial stretching) is applied between the molecules of the resin by the solid-state pressure low-temperature molding method at a temperature below the melting point of the resin. That is, the tension and heat fixation between molecules is not performed during molding, so that a certain amount of heat shrinkage occurs during heating. In addition, this molecularly oriented molded product has rigidity, gas barrier property, impact strength, and tensile strength of 1.5 to 3 at room temperature.
Has been doubled.

The shrinkage ratio of the inner cup varies depending on the shape of the container, the contents, etc., but it is preferable that a gap of about 0.5 to 5 mm be formed between the inner cup and the outer cup.

As the material used for the inner cup, polypropylene, polyester, polyethylene and other polymers having a gas barrier property can be used, and the layer constitution may be a single layer or a multi-layer structure. Further, various inorganic substances such as calcium carbonate and talc can be kneaded in order to improve the flammability. Among these, a multi-layered structure having polypropylene as an axis and a multi-layered structure including a layer in which an inorganic substance is kneaded are preferable, and for example, a layered structure in which an inorganic substance is kneaded in polypropylene / Eval / polypropylene is preferable.

The outer cup is mainly made of paper, and may be laminated with polypropylene film, polyethylene or the like, if necessary. For example, 150 to 50 g / m ²
This paper is made by laminating 15 to 30 μm of heat-adhesive resin such as polyethylene or polypropylene, and can be usually molded using a paper cup manufacturing device. Such a cup
It has high rigidity, does not soften even when the temperature rises, has excellent weight bearing capacity of contents, has no thermal deformation, has excellent heat insulation (low thermal conductivity), and is burned after use. There are no environmental problems. In addition, cosmetic printing may be directly applied to the surface of the outer cup.

It is preferable that the outer cup and the inner cup are connected by winding with air circulation. That is,
This winding is not a gas tight complete seal winding, but is formed so that there is air flow between the gap formed between the inner cup and the outer cup and the outside of the cup container. . In other words, immediately after pouring hot water, a gap is formed due to the contraction of the inner cup, so air is introduced into the gap from the outside through winding, and when the air that has flowed into the gap is warmed in the inner cup, Since the air of the above is thermally expanded, it is discharged to the outside through the winding tightening portion.

As described above, in order to join the outer cup and the inner cup by winding with air circulation, heat shrinkage is provided in the outer cup which is formed mainly of paper and has an engaging portion at the upper peripheral edge. The inner cup, which is molded to have and has a flat flange portion on the upper portion, is housed in a substantially sealed manner, the flange portion of the inner cup is heated, and the engaging portion of the outer cup is wound and fastened with the flange portion.

The cup container body of the present invention is filled with hot water,
It can be applied to a cup container of a product that gives heat when eating such as heating in a microwave oven, for example,
Applicable to instant cup noodle, instant soup, instant coffee, instant miso soup, curry, stew, porridge, soup powder container. In addition, the present invention can be applied to various applications requiring heat insulation and cooling.

[0015]

In the cup container of the present invention, before pouring hot water or the like into the inner cup, the inner cup and the outer cup are in close contact with each other and have a small wall thickness, and pouring hot water or the like into the inner cup. Thereby, the inner cup contracts to form an air layer between the inner cup and the outer cup, and this air layer acts as a heat insulating layer. That is, when hot water is poured and a certain amount of heat shrinkage occurs in the inner cup, the space between the inner cup and the outer cup becomes larger toward the bottom, but since the uppermost part is fixed, no shrinkage occurs. Therefore, an air layer exists between the inner cup and the outer cup.

In the process in which hot water is poured into the inner cup and the heat is transferred to the outer cup and transferred to the outer wall of the outer cup, the following heat transfer inhibiting condition, that is, the heat insulating effect occurs.

The heat conduction is hindered by the boundary film between the hot water (contents) and the inner wall of the inner cup. Low thermal conductivity of the inner cup material itself. Heat conduction is hindered by the boundary film between the outer wall of the inner cup and the air layer in contact with it. Heat conduction is obstructed by radiation from the air layer. Thermal conduction is obstructed by the boundary film between the inner surface of the outer cup and the air layer. Low thermal conductivity of the outer cup, which is mainly wound. Thermal conduction is obstructed by the film on the outer surface of the outer cup.

Therefore, at the outer wall of the outer cup held by a person when eating the temperature in the inner cup poured with hot water, 30
There is a temperature difference of ~ 55 ° C.

Further, when manufacturing the cup container, the engaging portion of the outer cup can be wound around the flange portion by simply heating the flange portion of the inner cup, so that the inner cup and the outer cup can be fixed very easily. Further, since the winding tightening is not adhered, air freely flows through the winding tightening portion, and the air is smoothly distributed between the gap formed by the contraction of the inner cup and the outside.

[0020]

An embodiment of the cup container of the present invention will be described with reference to the drawings. 1 is a sectional view of the cup container, FIG. 2 is a front view of the cup container in a stacking state, and FIG. 3 is a sectional view showing a process of manufacturing the cup container.

In the cup container 1 shown in FIG.
Is an outer cup, and 20 is an inner cup housed and fixed in the outer cup 10. The outer cup 10 is formed by being tapered so that the lower part thereof has a cylindrical shape with a slightly smaller diameter, and at its upper edge opening end, the engaging part 11 is formed by expanding outward and then being bent at about 90 ° C. Is formed, and a thread twister 12 is formed at the lower end thereof. Such an outer cup 10
Is formed by sticking a paper laminated with a polyethylene film.

The inner cup 20 is also formed in a cylindrical shape with a slightly smaller diameter at the lower part, and its inclination angle is the same as that of the outer cup 10. The outer surface 21 of the body portion of the inner cup 20 is fitted into the inner surface 13 of the same portion of the outer cup 10, and the outer surface 22 of the bottom portion thereof is fitted into the inner surface 14 of the bottom portion of the outer cup 10 in a substantially close contact state. Further, a winding tightening portion 23 is formed in the upper edge opening of the inner cup 20, and the winding tightening portion 23 tightens the engagement portion 11 to fix the inner cup 20 to the outer cup 10.

The inner cup 20 has a layer laminated with polypropylene on the inner side and 50% talc on polypropylene.
It has a two-layer structure with a kneaded outer layer.

In order to manufacture the cup container 1 as described above, first, the outer cup 10 is manufactured from paper, and the inner cup 20 is formed by solid-state pressure low-temperature molding. Has a flat flange portion 24 that will later become the tightening portion 23 due to heat shrinkage. As shown in FIG. 3, the outer cup 10 and the inner cup 20 which are separately formed in this way are integrated by inserting the inner cup 20 into the outer cup 10 in a state in which the respective surfaces are in close contact with each other. Then, set the flange 24 to 250 to 500.
When heated with hot air of ℃, since the strong intermolecular orientation is also applied to the opening by the solid-state low-temperature pressure molding method, the flange portion 24 is instantly softened and the rounded engagement portion 11 is tightened with the tightening portion 23. Become.

In such a cup container 1, the inner cup 20 is filled with processed seasoning food such as ramen, the opening is closed with an easy peel lid or an overcap (not shown), and further, with a plastic film. The entire surface is sealed and packaged. Then, when eating the ramen, hot water is poured into the inner cup 20, but at this time, the winding portion 23 and the engaging portion 11
Since air can flow in between the inner cup 20 and the inner cup 20, the inner cup 20 poured with hot water contracts due to the heat, and as shown by the two-dot chain line in the figure, the inner surface 14 of the body of the outer cup 14 An air layer a is generated between and. Therefore, since the air layer a exists between the inner cup 20 and the outer cup 10, the air layer a exhibits a heat insulating function and prevents heat from being transferred to the outer surface of the outer cup 10.

Further, since the cup container body 1 as described above has a small wall thickness, as shown in FIG. 2, the overlapping portions of the cup containers 1 are large, and the stacking can be performed extremely efficiently.

[0027]

EFFECTS OF THE INVENTION The present invention has the following effects due to the above constitution. The stacking property in an empty container is extremely good. Therefore, the transportation and storage costs of empty containers are significantly reduced. Since it is integrated with paper, it has good incineration properties. That is, the calorific value of combustion is about 6,000 kcal / kg or less, and
No harmful residues or fumes are emitted. Even when the oily food is filled, or even when the temperature is close to 100 ° C., there is no migration of resin decomposition products to food, and food safety is improved. Even when pouring hot water of 90 ° C or more, since it is insulated by the air gap, the surface of the outer cup is about 60 ° C, and you can hold it for a long time with your hands while feeling the warm feeling inside the cup. it can. In addition, it is possible to discriminate what is warm in the inner cup and prevent burns on the mouth, tongue, etc. during eating and drinking. It can be heated in the microwave.

[Brief description of drawings]

FIG. 1 is a sectional view of an embodiment of a cup container body of the present invention.

FIG. 2 is a front view showing a stacking example of the cup container body of the present invention.

FIG. 3 is a cross-sectional view showing a process of manufacturing the cup container of the present invention.

FIG. 4 is a cross-sectional view of a conventional cup container body.

FIG. 5 is a front view showing a state in which conventional cup container bodies are stacked.

[Explanation of symbols]

 1 ... Cup container 10 ... Outer cup 20 ... Inner cup a ... Air layer

Claims (3)

[Claims] 1. An outer cup formed mainly of paper,
A cup container having an inner cup formed so as to have a heat-shrinkable property and provided inside the outer cup in a substantially adhered state. 2. The cup container according to claim 1, wherein the outer cup and the inner cup are joined by winding with air circulation. 3. An inner cup, which is formed mainly of paper and has an engaging portion on the upper peripheral edge, has an inner cup which is molded to have heat shrinkability and has a flat flange portion on the upper portion, which is substantially sealed and housed. A method for manufacturing a cup container, characterized in that the outer cup and the inner cup are joined by heating the flange part of the cup and winding the engagement part of the outer cup around the flange part.