JP3047775B2 - Insulated cup - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

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

[0002]

2. Description of the Related Art Japanese Utility Model Laid-Open No. 5-49679 and 6-39.
717, Japanese Utility Model Application Laid-Open No. 6-80616 and the like disclose a cup in which an emboss is formed on the surface of a cup body. In the former two publications, embossing is used to make the cup a heat insulating structure. In the latter publication, the emboss is used to prevent blocking between cups and to prevent slippage when gripping.

[0003] On the other hand, there is a known one in which the periphery of a paper cup body is covered with a paper protective cover having a heat insulating structure. The cup configured in this way has the advantage that disposal at the time of disposal is easy and the material can be reused if necessary. One example of the protective cover has a layer structure of embossed paper and liner paper adhered to the side wall of the cup body.

[0004]

The embossing in the cups disclosed in the above three publications is rather coarse for the purpose. For this reason, there is a problem that characters and designs appearing on the cup surface are distorted and difficult to see. On the other hand, according to the structure in which the embossed paper is covered with the liner paper, there is an advantage that an attractive cup outer surface can be obtained. However, on the contrary, there are problems such as a high perceived temperature during use through the liner paper or a slippery surface.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-described conventional problems, and makes it easy to see the display objects such as characters and patterns on the outer surface of the cup, and has a relatively low sensible temperature during use.
Moreover, it is an object of the present invention to provide a heat-insulating cup whose surface is less slippery.

[0006]

The heat-insulating cup according to the present invention comprises a cup body having a paper side wall and a paper bottom wall;
A protective cover made of paper, which covers the side wall and is attached to the side wall, wherein the protective cover covers the side wall while substantially embossing a dot pattern. Embossed paper affixed to
A liner paper covering the embossed paper and affixed to the embossed paper and having a lattice-patterned surface embossed on the outer surface, wherein the point element forming the dot pattern of the emboss has a width of 2 mm to 5 mm, Element height difference is 1mm to 5mm
And that the width of the grid element forming the grid-like uneven pattern of the surface embossing is 500 μm to 1500 μm,
The ten-point average roughness of the surface emboss is 40 μm to 100 μm
m.

[0007]

According to the present invention, only a small emboss having a lattice-like uneven pattern is exposed on the outer surface of the protective cover attached to the cup body. For this reason, while the display objects such as characters and designs on the outer surface of the cup are easy to see, the surface is less likely to slip. In addition, the heat transfer to the outer surface of the protective cover is suppressed by the large emboss of the embossed paper, and the perceived temperature during use is reduced by the small emboss of the liner paper.

[0008]

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

The cup body 12 has a paper-made side wall 14 formed as a truncated cone-shaped tube, and a bottom wall 16 that closes the small diameter end of the side wall 14. The side wall 14 is formed by rolling a single piece of paperboard into a truncated cone shape, and overlapping and adhering both side ends 15. The bottom wall 16 has a shallow cylindrical shape and has legs, and is fitted into an end of the frustoconical side wall 14. Side wall 1
The small-diameter end of 4, ie, the periphery of the lower end, is folded inward so as to enclose the leg of the bottom wall 16, thereby ensuring the sealing performance.

The periphery of the large-diameter end, ie, the open end of the side wall 14 is bent outward to form a flange portion 18. The flange portion 18 is used to reinforce the cup body 12 and to attach the sheet-like lid 11. The lid 11 is made of paper,
The lower surface is coated with a heat insulating coating. The lid 11 is attached after the contents are filled in the cup body 12. Instead of the sheet-like lid 11, a cap (not shown) made of a transparent resin molded body or the like can be attached to the flange portion 18. An annular embossed line 19 is also formed on the side wall 14 so as to project outward. Embossed wire 19
When the liquid is injected into the cup body 12, it functions as a mark as a measure of the injection amount.

A protective cover 20 is provided so as to cover substantially the entire periphery of the side surface of the cup body 12, ie, the outer surface of the side wall 14. The protective cover 20 includes an embossed paper 24 adhered so as to cover the entire outer surface of the side wall 14 and an adhered liner paper 28 adhered so as to cover the entire embossed paper 24.
To form a multilayer structure.

The paperboard forming the side wall 14 and the bottom wall 16 of the cup body 12 is made of white high-quality paper, having a basis weight of about 210 g / m ² and a thickness of about 280 μm. Side wall 14
And a thickness of about 45 μm on the inner surface of the paperboard constituting the bottom wall 16.
m polyethylene film 13 is coated. Side wall 1
Paperboard for 4 has a basis weight of 170g / m ² ~310g / m
^{2. The} thickness is set to 220 μm to 420 μm. Further, the thickness of the polyethylene film 13 is set to 20 μm to 60 μm.

The embossed paper 24 is made of white bleached kraft paper and has a basis weight of 120 g / m ² . Embossed paper 2
An emboss 25 is formed on the entirety of 4 and is composed of a number of points arranged as a lattice inclined at about 45 degrees with respect to the central axis of the cup body 12. The embossed paper 24 is embossed 25
However, it must have a strength that does not collapse under normal use, but must be easy to process. From this viewpoint, the desirable range of the basis weight of the embossed paper 24 is 50 / m
^{2 to} 180 g / m ² . Paper having a large fiber length, such as bleached kraft paper, has the advantage that it is difficult to make holes when embossing is formed.

More specifically, the point of the emboss 25 is constituted by circular convex portions and circular concave portions having a diameter of about 3.5 mm, which are alternately arranged at equal intervals. The protrusions and the recesses are arranged as a square lattice that is inclined at about 45 degrees with respect to the center axis of the cup body 12 and that complementarily overlaps each other. The density of the emboss 25 is 7 / cm ^{2 in} total of the convex portions and the concave portions. The height of the emboss 25 (the difference in height between the convex and concave portions) is uniform over the entire embossed paper 24 and is set to about 2 mm.

The shape and size of the emboss 25 substantially define the insulating air layer formed in the protective cover 20. In consideration of both the heat insulating property and the heat retaining property of the heat insulating cup, the desirable range of the diameter of the projections and the depressions, which are the point elements of the dot pattern, is 2 mm to 5 mm. A desirable range of the height of the emboss 25 (the difference in height between the convex portion and the concave portion) is 1 mm to 5 mm. A desirable range of the density of the emboss 25 is 3 / cm ^{2 to} 25 / cm ² in total of the convex portions and the concave portions. As the pattern of the emboss 25, other patterns such as a rectangular lattice pattern composed of a large number of rectangles having substantially the same dimensions as the circular points can be adopted instead of the circular point lattice pattern described above.

The basis weight of the liner paper 28 is 230 g / m ^2.
On the front side, characters or designs relating to the product are applied by offset printing or gravure printing. A desirable range of the basis weight of the liner paper 28 is 180 g / m ² to 2 g.
70 g / m ² . If it is more than this range, the rigidity becomes too high, and the workability of the protective cover 20 decreases. If it is less than this range, the rigidity and strength are reduced, and irregularities following the emboss 25 are generated on the surface, or the protective cover 20 is easily broken during transportation or storage after being attached to the cup body 12.

More specifically, as shown in FIG. 3, an ink layer 3 for displaying characters and patterns on a liner paper 28 is provided.
2 is formed, and a varnish layer 34 having a thickness of 3 μm to 15 μm is formed so as to cover the entire liner paper 28. The varnish layer 34 is formed of, for example, an OP (overprinting) varnish, a release varnish, or the like. An embossment 36 having a lattice-like uneven pattern is formed on the entire upper surface, that is, the entire outer surface of the liner paper 28 (only a part is shown in FIGS. 1 and 2 for convenience of drawing). The lattice pattern of the emboss 36 is defined by a large number of grooves extending in two directions inclined at about 45 degrees with respect to the central axis of the cup body 12. The spacing between the grooves forming the lattice pattern, that is, the width of the lattice element is about 1 mm, and the ten-point average roughness of the emboss 36 is about 54 μm.

The preferable range of the width of the grid element in the grid-like uneven pattern of the emboss 36 is 500 μm to 1500 μm.
And the ten-point average roughness of the emboss 36 (JIS B06
01) is from 40 μm to 100 μm,
Preferably, the maximum roughness is 120 μm or less. If the width or the roughness is larger than these ranges, it is difficult to see a display object on the outer surface of the cup such as a character or a design. Conversely, if the width or roughness is smaller than these ranges, the temperature during use increases, and the surface becomes slippery. As the pattern of the emboss 36, other patterns such as a so-called satin pattern composed of a number of irregularities having substantially the same dimensions as each lattice can be adopted instead of the lattice pattern defined by the grooves.

The respective members of the cup body 12, the embossed paper 24 and the liner paper 28 are adhered with synthetic glue, for example, vinyl acetate glue or ethylene vinyl acetate (EVA) glue. In addition, 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 imitating the emboss 25. Therefore, it is desirable to use the above-mentioned vinyl acetate glue and ethylene vinyl acetate glue.

As described above, in the present embodiment, the protective cover 20 adhered to the cup body 12 includes the embossed paper 24 having the large embossed dot pattern 25 and the embossed paper 36 covering the embossed paper 24 and having the small lattice pattern on the outer surface. And a liner paper 28 having Thereby, not only the display objects such as characters and patterns on the outer surface of the protective cover 20 are easily seen, but also the surface of the protective cover 20 becomes less slippery when gripped. In addition, the large emboss 25 of the embossed paper 24 suppresses the amount of heat transferred to the outer surface of the protective cover 20, and
The small embossment 36 of the liner paper 28 further reduces the perceived temperature during use.

Next, a method of manufacturing a heat insulating cup according to an embodiment of the present invention will be described. First, the cup body 12 is formed by a known cup forming apparatus. Here, first, the prototype of the cup body 12 is formed by combining the side wall 14 rounded into a truncated cone and the shallow cylindrical bottom wall 16. Next, the flange portion 18 is formed by turning the side wall 14 outward at the periphery of the opening end of the cup body 12.

On the other hand, the protective cover 20 is formed in a system in which a known roll embossing device, a bonding device, and a punching device are combined. Therefore, a raw sheet roll of white bleached kraft paper, which is a raw material of the embossed paper 24, and a raw sheet roll of the liner paper 28 are set in the same system. The surface of the raw material sheet of the liner paper 28 is previously printed by gravure printing. By this printing, characters and designs relating to the product corresponding to the multiple protective covers 20 are applied to the surface of the raw material sheet of the liner paper 28. On the entire surface of the raw material sheet of the liner paper 28, an emboss 36 is formed by passing the raw material sheet under an emboss roller 38 as shown in FIG.

First, a material sheet of the embossed paper 24 is prepared by forming the emboss 25 while feeding the sheet from the sheet roll of bleached kraft paper. Next, glue, for example, vinyl acetate glue is applied to one side of the raw material sheet of the embossed paper 24. The application of the glue can be performed continuously after the formation of the emboss 25 or can be performed simultaneously with the formation of the emboss 25.

In synchronization with the feeding of bleached kraft paper,
The sheet is fed from the sheet roll of the liner paper 28. Then, this is superimposed on the glued surface of the raw material sheet of the embossed paper 24 and bonded by a clearance roller and a pressure belt.

Next, the raw material sheet of the embossed paper 24 and the liner paper 28 stuck thereto is cut into sheets of a predetermined width, and thereafter, punched and cut in accordance with characters and designs on the liner paper 28. As a result, it is possible to obtain a molded blank of the sector-shaped protective cover 20 having a size adapted to a size around 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 attaching the protective cover 20 around the side surface of the cup body 12 with glue using a winding device. When this winding method is adopted, the protective cover 2
No. 0 can be attached to the cup body 12 in a state where the both side end portions abut each other without overlapping.

Further, instead of the method of winding the protective cover 20, the side wall 1 of the cup body 12 may be
A method of assembling into a substantially frustoconical cylinder similar to 4 and then attaching the protective cover 20 while fitting it into the cup body 12 can also be adopted. In this case, an adhesive margin is provided on one side end of the molded blank of the protective cover 20, and the protective cover 20 is formed in a state where both side ends are overlapped.

[0028]

According to the heat insulating cup of the present invention, the protective cover is composed of embossed paper having a large embossed dot pattern and liner paper covering the embossed paper and having an embossed small embossed pattern on the outer surface. Is done. Since only small embosses with a lattice-like uneven pattern are exposed on the outer surface of the protective cover, not only the display objects such as characters and patterns on the outer surface of the protective cover are easy to see, but also the surface of the protective cover becomes less slippery when gripped. . In addition, by combination of large emboss of embossed paper and small emboss of liner paper,
The amount of heat transfer to the outer surface of the protective cover can be suppressed, and the perceived temperature during use can be reduced, so that it is possible to provide excellent heat insulation properties.

[Brief description of the drawings]

FIG. 1 is a partially cutaway perspective view showing a state where a heat insulating cup and a lid according to an embodiment of the present invention are separated.

FIG. 2 is a partially cutaway front view showing the heat insulating cup according to the embodiment of the present invention.

FIG. 3 is a cross-sectional view showing a liner paper of the heat insulating cup according to the embodiment of the present invention.

[Explanation of symbols]

10: lid, 12: cup body, 13: polyethylene film,
14 side wall, 16 bottom wall, 18 flange part, 20 protective cover, 24 embossed paper, 25 embossed 28 liner paper, 32 ink layer, 34 varnish layer, 3
6 ... Emboss.

──────────────────────────────────────────────────続 き Continued on the front page (56) References JP-A 4-45216 (JP, U) JP-A 52-152043 (JP, U) (58) Fields surveyed (Int. Cl. ⁷ , DB name) B65D 81/38 B65D 3/22

Claims (1)

(57) [Claims] 1. A heat insulating cup comprising: a cup body having a paper side wall and a paper bottom wall; and a paper protection cover covering the side wall and affixed thereto. An embossed paper that covers the side wall and is adhered to the side wall, and an embossed paper that covers and adheres to the embossed paper, and has a lattice embossed surface on the outer surface. The point element forming the dot pattern of the embossing has a width of 2 mm to 5 mm, a height difference of the point element is 1 mm to 5 mm, and the grid pattern of the surface embossing. The width of the grid element forming the uneven pattern is 500 μm or more.
1500 μm, the ten-point average roughness of the surface emboss is 40
μm to 100 μm.