JPH09132224A - Heat insulating cup - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heat insulating cup with a protective cover, which is excellent in workability and strength. SOLUTION: A heat insulating cup is equipped with an upside-down truncated cone-form cup main body with a side wall 14 made of paper and a bottom wall 16 made of paper, and an upside-down truncated cone-form protective cover 20 made of paper, which is affixed to the cup main body. The protective cover 20 is formed of a multi-layer structure with a corrugated paper 24 and a liner paper 28 which is affixed to the corrugated paper 24, and is rounded in such a manner that the liner paper 28 may become outside. The corrugation 25 of the corrugated paper 24 has a shape of meandering on the paper surface, and is oriented so as to be extended in the vertical direction of the cup main body.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat insulating cup having a protective cover attached to the cup body, and more particularly to a heat insulating cup for so-called instant foods and beverages in which hot water is poured into the contents for consumption.

[0002]

2. Description of the Related Art It is known that a paper cup main body is covered with a paper protective cover having a heat insulating structure. The cup configured in this way has the advantage that it is easy to dispose of when it is discarded and the material can be reused if necessary.

Japanese Utility Model Application Laid-Open No. 50-27080 discloses a cup in which a cardboard is wound as a protective cover around the cup body. The corrugated cardboard consists of two sheets of flat cardboard or liner paper, and a corrugated paper which is a core sandwiched between them.

[0004] Japanese Utility Model Laid-Open No. 6-39717 discloses a cup in which embossed paper on which dot embossing is formed is wound around a cup body as a protective cover. The publication also discloses a cup in which an embossed paper and an outer liner paper are wound as a protective cover around a cup body.

[0005]

[Problems to be Solved by the Invention] KAIKAI Sho 50-2708
In the case of a protective cover using corrugated paper as disclosed in No. 0, there is a problem in terms of workability. That is, the corrugated paper exhibits strong repulsive force or resistance to deformation except when it is rolled according to the orientation of its corrugation. For this reason, it becomes difficult for the protective cover to be rounded into a predetermined truncated cone shape that follows the shape of the cup body.

Further, the intermediate sheet formed by sticking corrugated paper and liner paper is likely to be warped in a direction perpendicular to the orientation of corrugation. Further, the corrugated paper is easily crushed by an external force from a direction perpendicular to the orientation of the corrugation. These problems not only reduce workability in the manufacturing process of the protective cover, but also cause peeling or deformation of the protective cover even after the protective cover is wound around the cup body.

In the case of the protective cover using the dot-shaped embossed paper disclosed in Japanese Utility Model Laid-Open No. 6-39717, a problem arises in terms of the adhesiveness between the cup body and the protective cover. this is,
This is because the adhesion between the cup body and the protective cover depends on a large number of point contacts. Therefore, in particular, when the protective cover is wrapped around the cup body and attached, the adhesive state may be insufficient.

Further, the embossed paper has different stretchability due to processing, so that it is deformed with time and easily bent into a wavy shape. Furthermore, the dot-like embossing is also likely to be crushed by an external force from the lateral direction. These problems not only reduce workability in the manufacturing process of the protective cover, but also cause peeling or deformation of the protective cover even after the protective cover is wound around the cup body.

The present invention has been made in view of the above conventional problems, and an object thereof is to provide a heat insulating cup which is excellent in mass productivity and low in cost by improving the workability of the protective cover. And

Another object of the present invention is to provide an insulating cup having a protective cover having excellent mechanical strength.
Another object of the present invention is to provide a heat insulating cup having good adhesion between the cup body and the protective cover.

[0011]

SUMMARY OF THE INVENTION A first aspect of the present invention is as follows.
A cup body having a paper side wall and a paper bottom wall; a paper protective cover covering the side wall and affixed to the side wall;
In a heat insulating cup, wherein the protective cover is formed by rolling a molding blank having a multi-layer structure having a corrugated paper and a liner paper attached to the corrugated paper so that the liner paper is on the outside. The corrugation of corrugated paper is characterized by a meandering shape on the paper.

A second aspect of the present invention is characterized in that, in the heat insulating cup according to the first aspect, the corrugations are oriented so as to extend along a vertical direction of the cup body.

According to the heat insulating cup of the present invention, since the corrugation has a meandering shape, the corrugated paper still has a repulsive force or a resistance force against the bending in the direction crossing the orientation of the corrugation, but its value is Considerably lower. Further, the intermediate sheet formed by sticking the corrugated paper and the liner paper is less likely to warp due to the meandering shape of corrugation. Furthermore, the corrugation itself has excellent strength against an external force from the direction intersecting the orientation due to the meandering shape.

[0014]

Embodiments of the present invention will be described below with reference to the drawings. 1 is a front view showing a heat insulating cup 10 according to an embodiment of the present invention, and FIG. 2 is a partially cutaway perspective view of the heat insulating cup shown in FIG.

The cup body 12 has a side wall 14 made of paper formed as an inverted frustoconical cylinder, and a bottom wall 16 closing the side wall 14 near the small diameter end. The side wall 14 is formed by rolling a sheet of paperboard into an inverted frustoconical shape and laminating both side end portions 15 on each other. The bottom wall 16 has a shallow tubular shape with legs, and is fitted into the lower end of the inverted truncated cone side wall 14.
The small-diameter end, that is, the peripheral edge of the lower end of the side wall 14 is folded back inward so as to wrap around the leg portion of the bottom wall 16, thereby ensuring the sealing property.

A large-diameter end of the side wall 14, that is, the peripheral edge of the opening end is folded back outward to form a flange portion 18. The flange portion 18 is used to reinforce the cup body 12 and to attach a sheet-like lid (not shown). The lid is attached after the cup body 12 is filled with the contents. Instead of the sheet-like lid, a cap (not shown) made of a transparent resin molding or the like may be attached to the flange portion 18.

An inverted frustoconical protective cover 20 is disposed so as to cover substantially the entire side surface of the cup body 12, that is, the outer surface of the side wall 14. The protective cover 20 has a multi-layer structure including a corrugated paper 24 attached to cover the entire outer surface of the side wall 14 and a liner paper 28 attached to cover the entire corrugated paper 24. The protective cover 20 has a uniform thickness throughout. The protective cover 20 is
The fan-shaped forming blank 32 shown in FIG.
Is formed by rolling so that it is on the outside.

The side wall 14 and the bottom wall 16 of the cup body 12
Is formed from paperboard having a basis weight of about 210 g / m ² and a thickness of about 280 μm. The inner surface of the paperboard that constitutes the side wall 14 and the bottom wall 16 is coated with a polyethylene film 13 having a thickness of about 45 μm. The paperboard for the side wall 14 has a basis weight of 17
^{0g / m 2 ~310g / m 2} , thickness 220μm~42
It is set to 0 μm. The thickness of the polyethylene film 13 is set to 20 μm to 60 μm.

The corrugated paper 24 is made of white bleached kraft paper and has a basis weight of 120 g / m ² . In the present embodiment, a corrugation 25 having a meandering shape on the paper is formed on the entire corrugated paper 24. More specifically, as shown in FIG. 3, the corrugation 25 is composed of a large number of meandering or corrugated grooves 26 and ridges 27 arranged at equal intervals so as to connect the upper and lower arc edges of the molding blank 32. . The center axes of the waves of the grooves 26 and the ridges 27 are oriented so as to extend parallel to the center line connecting the upper and lower arc edges. The back of the groove 26 is attached to the liner paper 28, and the tops of the ridges 27 running in the two grooves 26 are portions to be attached to the side wall 14 of the cup body 12.

The corrugated paper 24 is a corrugation 25.
However, it must be easy to process while having a strength such that it does not collapse under normal use. From this viewpoint, the desirable range of the basis weight of the corrugated paper 24 is 50 /
a m ² ~180g / m ^2. Note that paper having a large fiber length, such as bleached kraft paper, has an advantage that holes are unlikely to be formed when corrugations are formed.

The corrugations 25 also substantially define an insulating air layer formed within the protective cover 20. Therefore, the shape and size of the corrugation 25 are determined in consideration of both the heat insulating property and the heat insulating property of the heat insulating cup in addition to the mechanical strength thereof.

The basis weight of the liner paper 28 is 230 g / m ^2.
Then, on the surface on the front side, characters or designs relating to the product are applied by offset printing or gravure printing. The preferable range of the basis weight of the liner paper 28 is 180 g / m ² to 2
It is 70 g / m ² . If it is above this range, the rigidity becomes too high, and the workability of the protective cover 20 deteriorates. If it is below this range, the rigidity and strength will be reduced, and unevenness following the corrugation 25 will occur on the surface, or after the protective cover 20 is attached to the cup body 12, it will be easily broken during transportation or storage.

The respective members of the cup body 12, corrugated paper 24, and liner paper 28 are adhered to each other by a synthetic glue, for example, vinyl acetate glue or ethylene vinyl acetate (EVA) glue. In addition to this, various known pastes can be used as the paste. For example, starch-based glue can be used, but in this case, the surface of the liner paper 28 is likely to have irregularities following the corrugations 25. Therefore, it is desirable to use the above vinyl acetate-based glue or ethylene vinyl acetate-based glue.

Next, a method of manufacturing the heat insulating cup according to the embodiment of the present invention will be described. First, the cup body 12 is formed by a known cup molding device. Here, first, the side wall 14 rounded in the shape of an inverted truncated cone and the shallow cylindrical bottom wall 16 are combined as described above to form the prototype of the cup body 12. Next, the side wall 14 is folded outward at the periphery of the opening end of the cup body 12 to form the flange portion 18.

On the other hand, a molding blank of the protective cover 20 is formed by a known punching device. For this reason, first, the corrugated paper 2 having a meandering corrugation is formed.
The raw material sheet No. 4 and the raw material sheet of the liner paper 28 are attached. Printing is performed on the surface of the raw material sheet of the liner paper 28 by offset printing or gravure printing. By this printing, the characters and designs related to the products corresponding to the large number of protective covers 20 are applied to the surface of the raw material sheet of the liner paper 28.

Next, the material sheets of the corrugated paper 24 and the liner paper 28 that have been adhered are punched and cut in order according to the characters and designs on the liner paper 28. As a result, it is possible to obtain a fan-shaped molded cover of the protective cover 20 having a size that matches the size of the side surface of the cup body 12.

Next, the protective cover 20 is attached to the side wall 14 of the cup body 12. This can be performed, for example, by wrapping the protective cover 20 around the side surface of the cup body 12 with a wrapping device and adhering it with glue. When this winding method is adopted, the protective cover 2
0 can be attached to the cup main body 12 in a state of being abutted with each other without overlapping the both ends.

Further, instead of the method of winding the protective cover 20, the side wall 1 of the cup body 12 is previously prepared only by the protective cover 20.
It is also possible to adopt a method of assembling into a cylinder having an inverted truncated cone shape which is substantially the same as that of No. 4, and then attaching the protective cover 20 while fitting it into the cup body 12. In this case, the protective cover 20
The molding blank is provided with a glue margin at one side end, and the protective cover 20 is formed in a state where both side ends are overlapped.

As described above, in the heat insulating cup according to the embodiment shown in FIGS. 1 to 3, the corrugation 25 of the corrugated paper 24 has a meandering shape extending in the vertical direction. For this reason, the corrugated paper 24 is
5, the groove 26 and the ridge 27 still have a repulsive force or a resistance force against the bending in the direction intersecting the central axis of the wave, but the value thereof is considerably lowered. Therefore, the protective cover 20
It becomes easy to round into a predetermined truncated cone shape that follows the shape of the side wall 14 of the cup body 12.

Corrugated paper 24 and liner paper 28
The intermediate sheet formed by attaching and is the corrugation 2
The meandering shape of 5 makes it difficult for the warp to occur. Therefore, the productivity and the dimensional accuracy when punching out the protective cover 20 from the intermediate sheet are improved.

Further, the corrugation 25 itself has excellent mechanical strength against an external force from the direction intersecting the central axis of the wave of the groove 26 and the ridge 27 due to its meandering shape. That is, since the corrugations 25 are less likely to be crushed, variations in the thickness of the protective cover 20 are reduced.

As described above, in the heat insulating cup according to the present embodiment, not only the workability in the manufacturing process of the protective cover 20 is improved, but also the protective cover 2 is attached to the cup body 12.
It is possible to prevent peeling and deformation of the protective cover 20 even after winding 0.

Further, in order to investigate the heat insulating effect of the protective cover 20 in the heat insulating cup according to the embodiment shown in FIGS. 1 to 3, the heat insulating performance of the heat insulating cup of the example of the present invention and the heat insulating cup of the comparative example are shown. The test was conducted.

Here, the basis weight of the corrugated paper 24 and the liner paper 28 of the heat insulating cup of the embodiment is 120 g / m 2, respectively.
² , 230 g / m ² . The heat insulating cup of the comparative example was formed under substantially the same conditions as the heat insulating cup of the example except that the corrugation 25 was linear.

The heat insulating cups of Examples and Comparative Examples were heated to 100 ° C.
The surface temperature of the central portion of the protective cover 20 was measured after 3 minutes. As a result, the heat insulating cup of the example obtained a result of about 64 ° C, and the heat insulating cup of the comparative example gave a result of about 69 ° C. That is, it was found that the heat insulating cups according to the embodiments shown in FIGS. 1 to 3 also have an excellent effect in terms of heat insulating property.

In consideration of the workability of the protective cover 20, the corrugation 25 in the heat insulating cup according to the present invention is preferably oriented so as to extend along the vertical direction of the cup body 14. However, as shown in FIG. 4, the corrugations 25 oriented so as to extend in the horizontal direction can also provide the effects of improving the strength of the protective cover 20 and preventing the warp of the intermediate sheet.

[0037]

According to the heat insulating cup of the present invention, the corrugation of the corrugated paper has a meandering shape on the paper surface, whereby the workability of the protective cover can be improved. At the same time, it is possible to obtain the effects of preventing the warp of the protective cover, improving the strength of the protective cover, and improving the adhesiveness between the cup body and the protective cover. Therefore, it is possible to provide a robust heat insulating cup that is excellent in mass productivity, low in cost, and durable.

[Brief description of the drawings]

FIG. 1 is a front view showing a heat insulating cup according to an embodiment of the present invention.

2 is a partially cutaway perspective view of the heat insulating cup shown in FIG. 1. FIG.

FIG. 3 is an exploded view showing a protective cover of the heat insulating cup shown in FIG.

FIG. 4 is a diagram showing a modified example of the protective cover in a developed manner.

[Explanation of symbols]

10 ... Insulation cup, 12 ... Cup body, 14 ... Side wall, 1
6 ... Bottom wall, 18 ... Flange part, 20 ... Protective cover, 24
… Corrugated paper, 25… Corrugations, 26, grooves, 2
7 ... ridges, 28 ... liner paper.

Claims (2)

[Claims] 1. A cup main body having a side wall made of paper and a bottom wall made of paper, and a protective cover made of paper which covers the side wall and is adhered to the side wall, the protective cover being corrugated paper. In a heat insulating cup formed by rolling a multi-layered molding blank having a liner paper and a liner paper adhered to the liner paper, the corrugation of the corrugated paper meanders on the paper surface. A heat insulating cup characterized by having a shape. 2. The heat insulating cup according to claim 1, wherein the corrugations are oriented so as to extend along a vertical direction of the cup body.