JP2003040241A - Heat insulating paper cup - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heat insulating paper cup which is relatively lightweight and excellent in the side-pressing strength. SOLUTION: This heat insulating paper cup comprises a paper cup body (10) comprising a barrel part (11) and a bottom part (12), and a cylindrical blank (20) having the substantially same size as that of the barrel part of the paper cup body and formed of a cup base paper of the density <=0.4 g/cm<3> , and the cylindrical blank is joined with the barrel part so that one edge of the cylindrical blank is tightly attached to the other edge outside the barrel part of the paper cup body. An upper edge of the barrel part of the paper cup body is joined with an upper edge of the cylindrical blank in an overlapping manner, and the circumferential edge of the joined upper edges forms a curled mouth edge part (13).

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat-insulating paper cup for so-called instant foods and instant drinks that can store instant noodles and the like and can be drunk as it is by pouring hot water, and particularly, it has two members, a paper cup body and a tubular body. The present invention relates to a heat-insulating paper cup made of, which has a light weight and is excellent in lateral push strength.

[0002]

2. Description of the Related Art Conventionally, as a heat insulating paper cup, for example, an embossed paper having a large number of irregular patterns formed on the outer side of the body of a paper cup body that has been water resistant is pasted, and then a coated ball is placed on the embossed paper. There is a heat insulating cup having a heat insulating layer formed by sticking paperboard such as.

This heat-insulating cup has a complicated work process such as a gluing process because an adhesive is used, the container cost is relatively high, and the container weight is increased because the body paper is wound around the paper cup. There is.

Further, a paper cup is molded from double-sided polyethylene-processed paper having different melting points between the inner layer and the outer layer, and the molded paper cup is heated in a heating furnace or the like to vaporize the water content contained in the paper, and the vapor is discharged to the outside. There is also a paper-made heat-insulating cup in which the surface of the paper cup is made uneven by forming an uneven heat-insulating layer by holding it in polyethylene.

In this type of heat insulating cup, it is difficult to control the water content of the paper (if the water content is low, foaming does not occur) and the surface becomes uneven, so that the printed layer and the like are poor in aesthetic appearance, and the expansion ratio is low and the heat insulating property is low. There are problems such as low temperature and lowering of lateral pushing strength by heating.

[0006]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems relating to a heat-insulating paper cup. The heat-insulating paper cup is relatively lightweight and has excellent lateral pushing strength. The challenge is to provide.

[0007]

According to a first aspect of the present invention, a paper cup body having a body and a bottom is approximately the same size as the body of the paper cup body and has a density of 0.4 g / cm ^3.
A tubular blank made of the following cup base paper, and the tubular blank is wound around the outside of the body of the paper cup body so that one edge of the tubular blank is in close contact with the other edge, A heat-insulating paper cup joined to a body part, wherein a body part upper end edge of the paper cup body and an upper end edge of the tubular body blank are overlapped with each other, and the joined upper end edge rims are outside. A heat-insulating paper cup characterized by forming a curled lip.

In this way, the upper end edge of the body portion of the paper cup body and the upper end edge of the tubular body blank are overlapped with each other, and the peripheral edges of the upper end edges of the adhered portions are curled outward. Since it is formed, the rim portion is formed by stacking and curling the body member that forms the body portion of the paper cup body and the two members of the cylindrical body blank, and the lateral pushing strength is excellent. Become.

Further, the cylindrical blank has a density of 0.4 g /
Since it is composed of the cup base paper having a size of ³ cm ³ or less, the formed heat-insulating paper cup is lightweight.

According to a second aspect of the present invention, in the first aspect of the present invention, the bonded portion on the side surface of the body of the paper cup body, the one end edge of the tubular blank, and the close contact portion of the other end edge are different from each other. The heat-insulating paper cups are arranged so as to overlap each other.

The invention of claim 3 is the same as claim 1 or 2.
In the invention, the heat insulating paper cup is characterized in that the upper end edges on the left and right sides of the tubular body blank are cut off at the corners.

As described above, the bonded portion on the side surface of the body portion of the paper cup body and the one end edge of the tubular body blank and the close contact portion of the other end portion are arranged so as to overlap each other, and the tubular blank of the tubular body blank is also arranged. Since the corners are cut off at the upper edges on both the left and right sides, there is no overlap on the tubular blank, and even if the overlap of the body of the paper cup body is curled outward, the rim is clean. Curl.

The invention according to claim 4 is the invention according to claim 1, 2 or 3, wherein a heat seal varnish is applied to the peripheral edge of the cylindrical blank, and the heat seal varnish adheres to the body of the paper cup body. It is a heat-insulating paper cup characterized by having.

As described above, since heat seal varnish is applied to the peripheral edge of the cylindrical blank and the cylindrical blank and the body of the paper cup body are adhered by the heat seal varnish, no gluing step is required, The work process is simple and the weight of the container does not increase.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of a heat insulating paper cup of the present invention will be described in detail below with reference to the drawings. The heat-insulating paper cup of the present invention comprises, for example, as shown in FIG. 1, a body portion (11) and a bottom portion (12), an opening is formed at the upper end of the body portion, and a body portion and a bottom portion at the lower end of the body portion are formed. A paper cup body (10) having an annular leg portion (14) formed at the joint portion is approximately the same size as the body portion of the paper cup body, and has a density of 0.4 g /
Cylindrical blank (20) consisting of cup base paper of cm ³ or less
And a heat insulating paper cup in which the cylindrical blank is wound around the outside of the body of the paper cup body so that one end of the cylindrical blank is in close contact with the other end, and is joined to the body. The upper end edge of the body portion of the paper cup body and the upper end edge of the paper tube body are overlapped and joined to each other, and the joined upper end edges are curled outward (13). Is formed.

The paper cup body (10) includes a body member forming the body portion (11) and a bottom member forming the bottom portion (12).
Set a processed paper in which a polyolefin resin such as polyethylene resin or polypropylene resin is applied to both sides or one side of a cup base paper having a basis weight of about 170 to 400 g / m ^{2 for} about 10 to 40 μm in a generally known paper cup molding machine. Can be made.

The cylindrical blank (20) is wrapped around the outside of the body (11) of the paper cup body to provide heat insulation to the paper cup body, and the cup base paper having a density of 0.5 g / cm ³ or less is porous. An air layer is formed in this state, and this layer functions as a heat insulating layer, and therefore can be preferably used. Considering the heat insulating property, the density is more preferably 0.4 g / cm ³ or less. The low-density paper having a thickness of about 0.6 to 1.0 mm can be used.

The corners of the upper edges on both sides of the tubular blank are cleanly curled when the edge of the upper edge is curled outward together with the body of the paper cup body after being joined to the body of the paper cup body. To finish, the corners of the upper edge on both sides of the tubular blank are cut (22).

Further, the end of the surface of the cylindrical blank (20) which is in contact with the body portion (11) of the paper cup body is beforehand
A heat seal varnish application section (21) applied with heat seal varnish is provided. This is a cylinder blank (20)
This is because it is heat-bonded to the body immediately after being wound around the body (11) of the paper cup body. The heat-seal varnish may be applied to the peripheral edge of the cylindrical blank except the lower part,
A generally known material such as ethylene / vinyl acetate copolymer (EVA) is applied by a coating method such as a gravure coating method.

The tubular blank (20) has its one end overlapping the bonding portion (15) on the side surface of the body of the paper cup body, and its upper peripheral edge overlapping with the upper peripheral edge of the body of the paper cup body. Wrap it around. By wrapping in this way, it is possible to finish neatly without forming an unnatural step on the rim portion (13) described later.

Finally, the upper peripheral edge of the paper cup main body around which the cylindrical blank is wound is curled outward so that the edge portion (1
3) is formed to obtain the heat insulating paper cup (1) of the present invention. Since the lip portion is formed by the double member of the cylindrical body blank and the paper cup body portion, the lateral pushing strength of the cup lip portion is excellent.

The cylindrical blank uses a cup base paper having a density of 0.4 g / cm ³ or less, and is bonded only to the peripheral edge with the body of the paper cup body. Since a large number of air layers having heat insulating properties are included between the main body portions, the heat insulating effect is excellent.

[0023]

The present invention will be described in more detail with reference to the following examples. <Example 1> First, as a body member forming a body portion and a bottom member forming a bottom portion, a polyethylene processed paper in which a low-density polyethylene resin having a thickness of 20 μm is applied to one surface of a cup base paper having a basis weight of 200 g / m ² is prepared. Prepared and using a standard paper cup molding machine, polyethylene inside, height 1
Paper cup body (10) before forming a lip portion having a diameter of 07 mm, a diameter of 95 mm, a bottom diameter of 66 mm and a taper angle of 6.4 °
Was produced.

Separately, density 0.4 g / cm ³ , basis weight 250
Prepare g / m ² cup heat insulating paper, which is the base paper for the cup. When heat insulating paper (cylindrical blank) is wrapped around the body of the paper cup body on the back side of this heat insulating paper, the upper peripheral edge of the body member and side bonding A heat seal varnish of EVA resin was applied to a position corresponding to the portion by a gravure coating method so that the applied amount was 5 g / m ² .

This was punched out into a desired shape to obtain a cylindrical blank (20). The upper corners on both the left and right sides of the tubular blank are cut off in a substantially triangular shape to form a cutout portion (22). If necessary, a printing layer (not shown) or an overcoat varnish layer (not shown) may be provided on the surface.

Next, with the heat seal varnish application surface of the tubular blank (20) facing inside, one end of the tubular blank is attached to the side surface of the body of the paper cup body (15).
And so that the upper peripheral edge of the cylindrical blank overlaps the upper peripheral edge of the body of the paper cup body while being heated.

Finally, the upper peripheral edge of the paper cup main body around which the cylindrical blank is wound is curled outward so that the edge portion (1
3) was formed to obtain the heat-insulating paper cup (1) of Example 1.

<Comparative Example 1> A large number of concavo-convex patterns were formed on the body of a paper cup body having the same dimensions as in Example 1 prepared by using a cup base paper having a basis weight of 250 g / m ² coated with 25 μm of low density polyethylene resin on one side. Basis weight 100g / m
² of bleached kraft paper bonded, further the bleached over the kraft paper by sticking the coated board having a basis weight of 230 g / m ² to form a heat insulating layer, and a heat insulating cup of Comparative Example 1.

The heat insulating properties of the two types of heat insulating cups thus prepared, one type for the example and one type for the comparative example, were measured by the following method. The results are shown in Table 1. Measuring method of heat insulating property: Hot water at 90 ° C or higher was poured into a heat insulating cup, and the time for holding the heat insulating cup with bare hands was measured as the holding time. The longer the holding time, the better the heat insulation.

[0030]

[Table 1]

Although the heat insulating property is slightly inferior to that of the heat insulating cup of Comparative Example 1 which is currently used, it was judged to have sufficient practicality.

[0032]

As described above, the heat insulating paper cup of the present invention has a simple structure and a light weight because of the two-layer structure of the paper cup body and the low density paper. Flange (rim)
Is a heat-insulating paper cup that has a strong lateral push strength because it has a double structure of a single paper cup and low-density paper.

[Brief description of drawings]

FIG. 1 is an explanatory view showing an embodiment of a heat insulating paper cup of the present invention and an embodiment of each element constituting the heat insulating paper cup,
(A) is a partial cross-section explanatory drawing of a paper cup main body, (b) is
[FIG. 3] is a plan view of a tubular blank, (c) is a partial cross-sectional explanatory view showing a state where the tubular blank is wound around a paper cup body, and (d) is a partial cross-sectional explanatory view of a heat insulating paper cup.

[Explanation of symbols]

1 ... Insulating paper cup 10 ... Paper cup body 11 ... torso 12 ... bottom 13 rim 14 ... Ring leg 15: Laminating section 20 ... Cylinder blank 21 ... Heat seal varnish application part 22 ... Excision part 23 ... Adhesion part

Claims (4)

[Claims] 1. A paper cup body consisting of a body and a bottom, and having a size substantially the same as the body of the paper cup body and a density of 0.4 g.
/ A cylindrical body blank consisting cm ³ or less of the cup base paper, consists, the cylinder blank, so that one edge of the cylindrical body blank barrel outside of the paper cup body in close contact with the other edge A heat-insulating paper cup, which is wrapped around and is joined to a body part, wherein the body part upper edge of the paper cup body and the upper end edge of the paper cylinder blank are overlapped with each other and are joined together. A heat-insulating paper cup characterized in that the peripheral edge forms a curled rim on the outside. 2. The bonding portion on the side surface of the body portion of the paper cup body, and one end edge of the cylindrical body blank and the close contact portion of the other end edge are arranged so as to overlap each other. Insulating paper cup as described. 3. The heat-insulating paper cup according to claim 1, wherein the upper and left edges of the cylindrical blank have both corners cut off. 4. A heat seal varnish is applied to the peripheral edge of the cylindrical blank, and the heat seal varnish adheres to the body of the paper cup body.
Alternatively, the heat-insulating paper cup according to item 3.