JP3671463B2 - Insulation cup - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a heat insulating cup in which a protective cover is attached to a cup body, and more particularly, to a heat insulating cup for so-called instant foods and beverages that are poured into hot water for contents.
[0002]
[Prior art]
2. Description of the Related Art A paper cup body whose periphery is covered with a paper protective cover having a heat insulating structure is known. The cup constructed in this manner has the advantage that it can be easily disposed of and can be reused if necessary. An example of the protective cover includes a layer structure of embossed paper and liner paper attached to the side wall of the cup body.
Such a heat insulating cup is disclosed in, for example, Japanese Utility Model Laid-Open No. 6-39717.
[0003]
[Problems to be solved by the invention]
However, the heat insulating cup in which the cup body is covered by the protective cover has a high bonding force when the cups are stacked due to the elasticity of the protective cover. For example, this type of insulated cup is transported and stored in a stacked state before filling the contents. Therefore, when trying to feed the cups one by one by this automatic feeding device from this state, the outer surface of the upper cup and the inner surface of the lower cup completely come into surface contact, which causes a problem of separation from the cup.
The present invention has been made in view of the conventional problems as described above, and an object of the present invention is to provide a heat-insulating cup with good cup separation.
[0004]
[Means for Solving the Problems]
A heat insulating cup according to a first aspect of the present invention includes an inverted truncated cone-shaped cup body having a paper side wall and a paper bottom wall, and a paper inverted truncated cone that covers the side wall and is adhered thereto. In a heat insulating cup comprising a protective cover of the mold,
In the cup body, the bottom wall is provided with a spacer made of an annular protrusion integrally formed so as to protrude upward, and the outer diameter of the lower end of the protective cover is the top of the spacer. The inner diameter of the cup body at the same level is set to be substantially the same as or smaller than the inner diameter of the cup body. Here, when two heat insulation cups are stacked, the top of the spacer of the lower heat insulation cup is the upper heat insulation. It abuts on the lower end surface of the cup.
[0005]
The heat insulating cup according to the second aspect of the present invention is the heat insulating cup according to the first aspect of the present invention, wherein the cup body has a cylindrical recess on the back side of the bottom wall, and the outer diameter of the top portion of the spacer. Is set to be larger than the inner diameter of the cylindrical recess.
[0006]
According to the heat insulating cup according to the present invention, the upper and lower cups are prevented by the spacers formed around the bottom wall even when the cups are stacked, so that the upper cup is prevented from entering too deeply into the lower cup. The outer and inner surfaces of the film are not excessively adhered. For this reason, the static friction force generated between the upper and lower cups is small, and the upper cup can be pulled out from the lower cup with a small force.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is a front view showing a heat insulation cup 10 according to an embodiment of the present invention, and FIG. 2 is a partially cutaway perspective view of the heat insulation cup shown in FIG.
[0008]
The cup body 12 has a paper side wall 14 formed as an inverted frustoconical cylinder and a bottom wall 16 that closes the vicinity of the small diameter end of the side wall 14. The side wall 14 is formed by rounding a piece of paperboard into an inverted frustoconical shape, and laminating and sticking both side end portions 15. The bottom wall 16 has a shallow cylindrical shape with legs and is fitted into the lower end of the side wall 14 having an inverted frustoconical shape. The peripheral edge of the small-diameter end, that is, the lower end of the side wall 14 is folded inward so as to wrap the leg portion of the bottom wall 16, thereby ensuring the sealing performance. The structure of the lower end of the cup body 12 is an essential part of the present invention, and will be described later in detail.
[0009]
The peripheral edge of the large-diameter end, that is, the open end of the side wall 14 is folded outward to form a flange portion 18. The flange portion 18 reinforces the cup body 12 and is used for attaching a sheet-like lid (not shown). The lid is affixed 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 molded body or the like can be attached to the flange portion 18.
[0010]
An inverted frustoconical protective cover 20 is disposed so as to cover substantially the entire periphery of the side surface of the cup body 12, that is, the outer surface of the side wall 14. The protective cover 20 has a multilayer structure including an embossed paper 24 attached so as to cover the entire outer surface of the side wall 14 and a liner paper 28 attached so as to cover the entire embossed paper 24. The protective cover 20 has a uniform thickness throughout.
[0011]
The paperboard constituting the side wall 14 and the bottom wall 16 of the cup body 12 is made of white high-quality paper, and has a basis weight of about 210 g / m ² and a thickness of about 280 μm. A polyethylene film 13 having a thickness of about 45 μm is coated on the inner surface of the paperboard constituting the side wall 14 and the bottom wall 16. The paperboard for the side wall 14 has a basis weight of 170 g / m ^{2 to} 310 g / m ² and a thickness of 220 μm to 420 μm. The thickness of the polyethylene film 13 is set to 20 μm to 60 μm.
[0012]
The embossed paper 24 is made of white bleached kraft paper and has a basis weight of 120 g / m ² . In the present embodiment, the embossed paper 24 is entirely embossed with a plurality of vertically long convex portions partitioned by a number of longitudinal grooves arranged at equal intervals and a plurality of horizontal grooves arranged at equal intervals. 25 is formed.
[0013]
The embossed paper 24 needs to be easy to process while the embossed paper 25 has such strength that the embossed 25 is not crushed by normal use. From this viewpoint, the desirable range of the basis weight of the embossed paper 24 is 50 / m ^{2 to} 180 g / m ² . Note that paper having a long fiber length, such as bleached kraft paper, has the advantage that it is difficult to perforate when embossing is formed.
[0014]
The emboss 25 substantially defines a heat insulating air layer formed in the protective cover 20. Therefore, the shape and dimensions of the emboss 25 are determined in consideration of both the heat insulating properties and the heat retaining properties of the heat insulating cup. As the emboss 25, a pattern such as a concave / convex dot pattern or a wavy pattern can be adopted in addition to the pattern of the present embodiment.
[0015]
The basis weight of the liner paper 28 is 230 g / m ² , and characters and designs relating to products are applied to the front side surface by offset printing or gravure printing. The basis weight of the desired range of the liner sheet 28 is ^{180g / m 2 ~270g / m 2} . If it is above this range, the rigidity becomes too high, and the workability of the protective cover 20 decreases. If it is below this range, the rigidity and strength are reduced, and irregularities following the emboss 25 are generated on the surface, or after the protective cover 20 is attached to the cup body 12, it is easily broken during transportation and storage.
[0016]
The members of the cup body 12, the embossed paper 24, and the liner paper 28 are respectively attached 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 also be used, but in this case, unevenness following the emboss 25 is likely to occur on the surface of the liner paper 28. Therefore, it is desirable to use the above vinyl acetate glue or ethylene vinyl acetate glue.
[0017]
Next, the structure of the lower end of the cup body 12 will be described in detail.
As shown in FIGS. 1 and 3A, the bottom wall 16 includes a spacer 42 formed of an annular convex portion on the periphery. In the present embodiment, the spacer 42 is formed by bending an intermediate portion that connects the cylindrical leg portion 44 and the circular flat portion 46. In general, the bending of the intermediate portion for forming the spacer 42 is simultaneously performed when the base paper of the bottom wall 16 is pressed with a pressing die to form the leg portion 44 and the flat portion 46.
[0018]
The leg portion 44 of the bottom wall 16 is surrounded by the folded portion 52 at the lower end of the side wall 14 over the entire circumference. Both surfaces of the leg portion 44 are adhered to the side wall 14 and the folded portion 52 by glue, thereby ensuring a sealing property.
[0019]
The spacer 42 is intended to improve the separation of the cup when the cups are stacked. For example, as shown in FIG. 4, when two cups 10a and 10b according to the present embodiment are overlapped, the top of the spacer 42 of the lower cup 10a comes into contact with the lower end surface of the upper cup 10b. That is, the spacer 42 prevents the upper cup 10b from entering too deeply into the lower cup 10a. For this reason, the static frictional force generated between the cups 10a and 10b is small, and the upper cup 10b can be pulled out from the lower cup 10a with a small force.
[0020]
From this point of view, when the two cups 10a and 10b are overlapped, the position of the spacer 42 can contact the top of the spacer 42 of the lower cup 10a with the lower end surface of the upper cup 10b. The inner surface of the lower cup 10a is selected so as not to be in close contact with the outer surface of the upper cup 10b. In other words, the top of the spacer 42 of the lower cup 10a does not sink into the cylindrical recess 54 defined by the folded portion 52 of the side wall 14 on the back side of the upper cup 10b, and the lower end surface of the upper cup 10b. Abut. At the time of this contact, the outer diameter of the lower end of the upper cup 10b is approximately the same as or slightly smaller than the inner diameter of the lower cup 10a at the position facing it.
[0021]
In order to satisfy the above conditions, each cup, that is, the cup 10 shown in FIG. 1 has the outer diameter of the lower end of the protective cover 20 approximately equal to or larger than the inner diameter of the cup body 12 at the same level as the top of the spacer 42. It is set to be somewhat smaller. Further, the outer diameter of the top of the spacer 42, that is, the outer diameter of the annular protrusion is larger than the inner diameter of the lower end of the cup body 12, that is, the inner diameter of the cylindrical recess 54, and preferably larger than the inner diameter of the protective cover 20. Set to be larger.
[0022]
As shown in FIG. 3B, the spacer 42 may be formed to have a wide top portion 43 having a width of, for example, 2 mm to 3 mm. In this way, contact between the top of the spacer 42 of the lower cup 10a and the lower end surface of the upper cup 10b can be reliably obtained. Further, as shown in FIG. 3C, the side surface of the spacer 42 can be formed along the inner surface of the side wall 14. In this way, there is no gap between the spacer 42 and the side wall 14, so that the contents are not caught here and the strength of the cup itself is improved.
[0023]
As described above, according to the heat insulating cup according to the present embodiment, the outer surfaces of the upper and lower cups are not excessively adhered by the spacer 42 even when the cups are stacked. For this reason, the cup separation is good despite the high elasticity of the protective cover 20.
[0024]
Next, the manufacturing method of the heat insulation cup which concerns on embodiment of this invention is demonstrated.
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 an inverted frustoconical shape and the shallow cylindrical bottom wall 16 as described above. 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.
[0025]
On the other hand, a molding blank of the protective cover 20 is formed by a known punching apparatus. For this reason, first, a raw material sheet of the embossed paper 24, for example, a sheet of corrugated paper and a raw material sheet of the liner paper 28 are attached. The surface of the raw material sheet of the liner paper 28 is printed by offset printing or gravure printing. By this printing, characters and designs relating to the product corresponding to the large number of protective covers 20 are applied to the surface of the raw material sheet of the liner paper 28.
[0026]
Next, the pasted raw sheets of the embossed paper 24 and liner paper 28 are sequentially punched and cut according to the characters and designs on the liner paper 28. Thereby, the shaping | molding blank of the fan-shaped protective cover 20 which has a dimension suitable for the dimension around the side surface of the cup main body 12 can be obtained.
[0027]
When the forming blank is punched and cut, the transverse grooves are pressed by a ruled line blade so as to intersect with the longitudinal grooves of the corrugated paper that is the raw material of the embossed paper 24. Thereby, the emboss 25 which consists of many vertically long convex parts divided by the vertical groove and the horizontal groove is formed. By forming such an emboss 25, workability and certainty when assembling the protective cover 20 can be improved as compared with the case where corrugated paper is used as it is. The lateral grooves can be formed even before punching of the molding blank as long as the corrugated paper sheet as the raw material sheet of the embossed paper 24 and the raw material sheet of the liner paper 28 are adhered.
[0028]
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 glue while winding the protective cover 20 around the side surface of the cup body 12 with a winding device. When this winding method is adopted, the protective cover 20 can be attached to the cup body 12 in a state of being abutted without overlapping the end portions on both sides.
[0029]
Further, instead of the method of winding the protective cover 20, the protective cover 20 alone is assembled in advance into an inverted frustoconical cylinder substantially the same as the side wall 14 of the cup body 12, and then the protective cover 20 is attached while being fitted into the cup body 12. The method can also be adopted. In this case, the molding blank of the protective cover 20 is provided with an adhesive margin at one side end portion, and the protective cover 20 is formed in a state where the both side end portions are overlapped.
[0030]
【The invention's effect】
According to the heat insulating cup according to the present invention, since the spacer is formed around the bottom wall, the outer inner surfaces of the upper and lower cups are not excessively adhered even when the cups are stacked. For this reason, the cup separation is good despite the high elasticity of the protective cover.
[Brief description of the drawings]
FIG. 1 is a front view showing a heat insulating cup according to an embodiment of the present invention.
FIG. 2 is a partially cutaway perspective view of the heat insulating cup shown in FIG. 1;
3A is a schematic view showing an enlarged lower end of the cup body of the heat insulating cup shown in FIG. 1, and FIGS. 3B and 3C are schematic views showing a modification example thereof.
4 is a schematic view showing a state in which the heat insulating cups shown in FIG. 1 are stacked. FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 ... Heat insulation cup, 12 ... Cup body, 14 ... Side wall, 16 ... Bottom wall, 18 ... Flange part, 20 ... Protective cover, 24 ... Embossed paper, 25 ... Embossed paper, 28 ... Liner paper, 42 ... Spacer, 44 ... Leg Part, 46 ... flat part.

Claims (2)

In a heat insulating cup comprising: an inverted frustoconical cup body having a paper side wall and a paper bottom wall; and a paper reverse frustoconical protective cover that covers the side wall and is adhered thereto. ,
In the cup body, the bottom wall is provided with a spacer made of an annular protrusion integrally formed so as to protrude upward, and the outer diameter of the lower end of the protective cover is the top of the spacer. The inner diameter of the cup body at the same level is set to be substantially the same as or smaller than the inner diameter of the cup body. Here, when two heat insulation cups are stacked, the top of the spacer of the lower heat insulation cup is the upper heat insulation. A heat insulating cup, wherein the heat insulating cup is in contact with a lower end surface of the cup. The cup body includes a cylindrical recess on a back side of the bottom wall, and the outer diameter of the top of the spacer is set to be larger than the inner diameter of the cylindrical recess. The heat insulation cup according to 1.

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