JP3047776B2 - Insulated cup and method of manufacturing the same - 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 It is known that a paper cup body is covered with a protective cover made of paper 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. When the protective cover is formed by bonding the embossed paper and the liner paper in advance, the glue between the side wall of the cup body and the protective cover is usually applied to the protective cover side in a pressurized state by an application roller.

[0003]

In the conventional heat insulating cup in which the glue is applied to the entire inner surface of the protective cover, the amount of the glue becomes enormous, and the cup body, the protective cover, etc. are deformed due to the drying shrinkage of the glue. In addition, there are problems such as peeling off at the side end of the protective cover. In addition, when the glue layer is provided, the embossed paper is crushed, and heat is easily transmitted to the outer surface of the protective cover.

On the other hand, heat insulating cups in which glue is applied only to a band-like region along both side edges of the protective cover have already been developed. With this conventional heat-insulating cup, however, it feels unreliable when grasping the heat-insulating cup, the surface of the protective cover is likely to have irregularities, or the protective cover is easily detached from the cup body once the glue is peeled off. There is a problem.

The present invention has been made in view of the above-mentioned conventional problems, and provides a heat insulating cup having good adhesion between a cup body and a protective cover and a good feeling in use, and a method of manufacturing the same. The purpose is to:

[0006]

According to a first aspect of the present invention, there is provided an insulated cup having a cup body having a paper side wall and a paper bottom wall, and a paper covering the side wall and affixed thereto. And a protective cover formed of a single molded blank formed into a cylindrical shape on the side wall such that the first and second side ends thereof face each other. In the heat insulating cup, the first and second molding blanks may include the first and second molding blanks.
The first glue is applied in a pressurized state to the two band-shaped first regions respectively disposed at the side end portions, and the non-pressurized state is applied to at least one second region disposed outside the first region. Second
A glue is provided, and the side wall and the protective cover are adhered by the first and second glues.

A method of manufacturing a heat insulating cup according to a first aspect of the present invention includes a step of applying the first paste to the first region of the molded blank in a pressurized state by an application roller, and A step of applying the second glue to the second area in a non-pressurized state by spraying, and a step of attaching the molded blank to the side wall while rolling the molded blank.

A heat insulating cup according to a second aspect of the present invention comprises:
A cup body having a paper side wall and a paper bottom wall, a paper protection cover covering the side wall and attached thereto,
Wherein the protective cover comprises one molded blank,
In a heat insulating cup which is rolled into a cylindrical shape on the side wall so that the first and second side ends are opposed to each other, the heat insulating cup is formed along the first and second side ends of the molded blank, respectively. The first glue is applied to the two arranged band-shaped first regions in a pressurized state, and the second glue is applied to the second region on the outer surface of the side wall in a non-pressurized state. The side wall and the protective cover are attached to each other with two pastes.

[0009]

According to the present invention, the adhesive between the cup body and the protective cover is applied to a band-like sheet with a large amount of glue applied in a pressurized state, which is disposed on both side ends of the molded blank of the protective cover. This is performed via the first area and the second area, which is disposed between the first areas and has a small amount of glue applied with glue in a non-pressurized state. The first area mainly fixes the cup body and the protection cover firmly, and the second area mainly prevents the protection cover from rising. The first and second regions maintain the adhesiveness between the cup body and the protective cover and the feeling of use of the heat insulating cup.
Since the amount of the glue used is small, deformation and peeling of the member due to drying shrinkage of the glue are suppressed, and since the embossed paper is not crushed, the amount of heat transfer to the outer surface of the protective cover is reduced, and the perceived temperature during use is reduced.

[0010]

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 peripheral edge of the large-diameter end, that is, 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.

The shape and dimensions of the emboss 25 will 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 of the dot pattern is 2 mm to 5 mm. The 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.
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 size as the circular point, a corrugated pattern, etc. can be adopted instead of the above-mentioned circular point lattice pattern.

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.

The members of the cup body 12, the embossed paper 24, and the liner paper 28 are adhered to each other with synthetic glue, for example, vinyl acetate glue, 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.

In this embodiment, the protective cover 20 is formed from a single fan-shaped molded blank 32 as shown in FIG. 3 having a layered structure composed of embossed paper 24 and liner paper 28 that have been bonded in advance. The molding blank 32
The first and second lateral end portions 34 and 36 are rounded into a cylindrical shape so that they abut against each other.
Affixed to

In the forming blank 32, the first glue is applied in advance to the first and second lateral end portions 34 and 36 and the three band-like first regions 38 along the center line by a coating roller under pressure. Granted. Further, in the molded blank 32, the second paste is applied to the two second regions 42 between the three first regions 38 by a spray in a non-pressurized state. The side wall 14 and the protective cover 20 are adhered by these pastes. First and second
The glue is made of the same type of glue, for example, ethylene vinyl acetate glue.

As described above, the first glue is applied in a pressurized state to the band-like first region 38 along both sides of the molded blank of the protective cover 20 and the center line, and the first glue between the first regions 38 is formed. 2
The second glue is applied to the area 42 without pressure. As a result, the amount of glue used is reduced, and the cup body 12, the protective cover 20, etc. are deformed due to drying shrinkage of the glue,
Problems such as peeling off at the lateral end of the protective cover 20 can be avoided. Outside the first area 38, the embossed paper 24 is not crushed when the glue layer is provided, so that the amount of heat transfer to the outer surface of the protective cover 20 is reduced, and the sensible temperature during use can be suppressed. In addition, between the first areas 38, the second area 42 uses the second adhesive to apply the protective cover 2.
0 and the cup body 12 are connected, so that the protective cover 2
0 is prevented from rising or shifting. Therefore, problems such as unreliable feeling when grasping the heat insulating cup, irregularities on the surface of the protective cover 20, or detachment of the protective cover 20 from the cup body 12 once the adhesive is peeled off do not occur.

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.

First, a material sheet of embossed paper 24 is prepared by forming an emboss 25 while feeding the sheet from a 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 is cut into a sheet of a predetermined width, and thereafter, it is sequentially cut and cut in accordance with characters and designs on the liner paper 28. As a result, it is possible to obtain the molded blank 32 of the sector-shaped protective cover 20 having a size adapted to the size around the side surface of the cup body 12.

Next, the first glue is applied to the first and second lateral end portions 34 and 36 of the molded blank 32 and the three band-shaped first regions 38 along the center line in a pressurized state by an application roller. I do. Subsequently, a second paste is applied to the two second regions 42 of the molded blank 32 between the three first regions 38 by a spray in a non-pressurized state. Here, as described above, it is desirable to use the same type of paste as the first and second pastes, for example, an ethylene vinyl acetate paste. The attached amount of the glue in the first and second regions is different. For example, the attached amount of the first and second regions is 0.1 g each in the concentration of the glue at the time of application.
/ Cm ² -0.5 g / cm ² and 0.005 g / cm ²
０．１0.15 g / cm ² .

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 with the first and second pastes while winding the protective cover 20 around the side surface of the cup body 12 using a winding device. When this winding method is adopted,
The protective cover 20 can be attached to the cup body 12 in a state where the both side end portions are butted against 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, the molding blank 32 of the protective cover 20 has a margin for glue (for example, FIG.
And the protective cover 20 is formed in a state where both ends are overlapped.

As described above, the first glue is applied to the belt-shaped first region 38 of the molded blank 32 by the application roller, and the second glue is applied to the second region 42 by spraying, so that a different amount of glue is attached. It can be reliably applied to the molded blank 32. The application of the first and second pastes is generally performed as separate steps (ie, not performed simultaneously).
However, since the process is almost continuous, this does not lower the throughput.

FIG. 4 shows a molded blank 52 having a margin 58.
FIG. In this molding blank 52, the first and second regions 3 to which the first and second glues are respectively applied are also provided.
8 and 42 are different from those shown in FIG. The first glue is applied to the two band-shaped first regions 38 along both side ends 54 and 56 of the molded blank 52 by an application roller in a pressurized state. Further, the second glue is applied to one second region 42 located substantially at the center of the molding blank 52 by a spray in a non-pressurized state. Here, the second region 42 is formed to have a horizontally long elliptical shape.

FIG. 5 is a diagram showing still another mode of the first and second regions 38 and 42 to which the first and second glues are applied, respectively. In this modified example, the first glue is provided at both end portions 3.
A total of five strip-shaped first regions 3 including four, four and three regions along the center line and two regions at the center of the three regions
8 is applied in a pressurized state by an application roller. Also,
The second glue is applied by spraying to the four second regions 42 located at the center of the five first regions 38 in a non-pressurized state. Here, the second region 42 is formed so as to have a vertically long elliptical shape.

As shown in FIGS. 4 and 5, the first and second
The number, position, and shape of the first and second regions 38 and 42 to which the glue is applied can be variously changed. However, the two band-shaped regions located on both side ends of the molding blanks 32 and 52 must be formed as first regions. Also, the second
It is desirable that the region is arranged so as to be located substantially at the center of the first region.

In the present invention, the molded blank 3
The first glue is applied to the inner surfaces of the cups 2 and 52 by a coating roller in a pressurized state, while the second glue is applied to the outer surface of the side wall 14 of the cup body 12.
The glue is applied in a non-pressurized state by spraying, and the protective cover 20 can be stuck to the side wall 14 with these glues. In this case, the first region to which the glue is applied in a pressurized state by the application roller includes two band-shaped regions located at both side ends of the molding blanks 32 and 52. Further, the second region to which the paste is applied in a non-pressurized state by spraying may be the entire side wall 14 or may be only a selected part. When only a part of the outer surface of the side wall 14 is the second region, the position of the second region is the same as the second region 42 on the molding blanks 32 and 52 shown in FIGS. 3, 4 and 5.
It is desirable that the selection be made so as to correspond to a substantially central position of the first region.

When glue is applied to the side wall 14 of the cup body 12 by spraying or the like without applying pressure, the glue is uniformly applied to an arbitrary position with a set application amount, even if the side wall 14 is curved. Can be granted.

[0036]

According to the heat insulating cup of the present invention, the adhesive between the cup body and the protective cover is applied to the band-shaped first region with a large amount of glue applied in a pressurized state, and the glue is removed. This is performed through the second region where the amount of glue applied in a pressurized state is small. Therefore, the amount of glue used can be reduced without deteriorating the adhesiveness between the cup body and the protective cover and the feeling of use of the heat insulating cup. Further, it is possible to prevent deformation and peeling of the member due to drying shrinkage of the paste, which is likely to occur due to excessive use of the paste. In addition, since the embossed paper does not collapse when the glue layer is provided, the amount of heat transfer to the outer surface of the protective cover is reduced, and the sensible temperature during use can be suppressed.

[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 view showing a molded blank for forming a protective cover of the heat insulating cup according to the embodiment of the present invention.

FIG. 4 is a diagram showing a modified example of a molded blank for forming a protective cover.

FIG. 5 is a diagram showing a modified example of a mode of applying a paste to the molded blank shown in FIG. 3;

[Explanation of symbols]

10: lid, 12: cup body, 13: polyethylene film,
14 ... side wall, 16 ... bottom wall, 18 ... flange portion, 20 ... protective cover, 24 ... embossed paper, 28 ... liner paper, 32
... Molded blank, 38. First area for gluing, 42. Second area for gluing.

────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Akiaki Isoe 1-5-1, Taito, Taito-ku, Tokyo Toppan Printing Co., Ltd. (72) Inventor Yoshihiro Akima 1-5-1, Taito 1-5-1, Taito-ku, Tokyo Toppan Inside Printing Co., Ltd. (72) Inventor Hiroya Shiki 5-1-1 Taito, Taito-ku, Tokyo Toppan Printing Co., Ltd. (56) References JP-A-52-148380 (JP, A) Jpn. (JP, U) (58) Field surveyed (Int. Cl. ⁷ , DB name) B65D 81/38 B65D 3/22

Claims (3)

(57) [Claims] 1. 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, wherein the protection cover is one piece. In a heat insulating cup, the molded blank is rolled into a cylindrical shape on the side wall such that the first and second side ends thereof face each other. The molded blank includes the first and second sides. The first glue is applied in a pressurized state to the two band-shaped first regions respectively arranged along the one end, and no pressure is applied to at least one second region arranged outside the first region. A heat insulating cup, wherein a second paste is applied in a state, and the side wall and the protective cover are adhered by the first and second pastes. 2. A step of applying the first glue to the first region of the molding blank in a pressurized state by an application roller, and a step of spraying the second paste in the second region of the molding blank in a non-pressurized state. The method for producing a heat insulating cup according to claim 1, further comprising: a step of applying glue; and a step of attaching the molded blank to the side wall while rolling the molded blank. 3. A cup 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 cup body. In a heat insulating cup, the molded blank is rolled into a cylindrical shape on the side wall such that the first and second lateral ends thereof face each other. The first and second lateral ends of the molded blank The first belt-shaped first regions are arranged under pressure in the two band-shaped first regions respectively arranged along the portions.
The adhesive is applied, and the second adhesive is applied to the second region of the outer surface of the side wall in a non-pressurized state, and the side wall and the protective cover are adhered by the first and second adhesives. And insulated cup.