JP2001192015A - Heat insulating cup made of paper and manufacturing method therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heat insulating cup made of paper which is good-looking, excellent in heat insulation effects and relatively inexpensive. SOLUTION: A lower part of a paper cup body 10 is formed so that a diameter D1 of a periphery at a tip of an annular pedestal 14 is larger than a diameter D2 of a periphery of a base 12 of the cup body. An upper part of a paper cylinder 20 is formed with an elongated curl 21 which is curled inwardly into an approximately longitudinally elongated ellipse, while an internal face side of the elongated curl is fixed in contact with an external face side of a barrel 11 immediately below a rim 13 of the paper cup body. A lower part of the paper cylinder is formed with a fold 22 by folding inward to cover the annular pedestal of the paper cup body, and an internal face side of a tip of the fold 22 is fixed to an internal face side of the pedestal 14 via an adhesive, so that a heat insulating air layer 30 is provided between the barrel 11 of the paper cup body and the paper cylinder 20.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a paper insulation cup for storing instant noodles, instant miso soup and the like, and more particularly, to a paper for so-called instant food and instant beverage which can be poured and consumed as it is by pouring boiling water. The present invention relates to a heat-insulating cup.

[0002]

2. Description of the Related Art Conventionally, as a paper insulation cup for pouring hot water into a container such as instant noodles and eating the same, for example, a lower part of a paper cylinder is wound inward to form a winding part, In some cases, a heat insulating space layer is provided between the cylinder and the body of the paper cup body to form a heat insulating cup. Further, there is known an insulating cup or the like in which a corrugated paper is adhered to the outside of a body portion of a paper cup body, and a thin paper is adhered on the corrugated paper to form a heat insulating space layer.

In the former heat-insulating cup, when the paper cup body is covered with the paper cylinder and integrated, the bottom of the paper cup body corresponds to the winding portion of the paper cylinder, and the paper cylinder is well placed on the paper cup body. May not cover. For this reason, if the winding part is reduced, a sense of unity with the paper cup body does not appear, and a feeling of discomfort appears when touching the bottom part, and if the winding part of the winding part is turned up and the inner diameter of the winding part is increased, The bottom of the paper cup body can be seen from the side and the appearance is poor.

[0004] Further, since the way of narrowing the paper cup body downward is linear and substantially the same as the angle of narrowing toward the lower part of the paper cylinder, the body of the paper cup body and the paper cylinder are formed. The heat-insulating space layer formed therebetween is extremely thin below the paper cup main body and has little heat-insulating effect.

[0005] The latter heat-insulating cup is costly due to the large amount of materials used and the complexity of the working steps.

[0006]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems relating to a paper heat insulating cup, and has a good appearance, an excellent heat insulating effect, and a relatively low price. It is an object to provide an inexpensive paper insulation cup.

[0007]

Means for Solving the Problems A first invention of the present invention is:
A paper cup body having a body portion and a bottom portion, an opening portion having an edge portion curled outward, and an annular leg formed at a joint between the body portion and the bottom portion, and fitted into the outside of the body portion of the paper cup body. And a lower portion of the paper cup body, wherein the diameter of the peripheral edge of the tip of the annular leg is larger than the diameter of the bottom edge of the paper cup body. The upper part of the body is formed with a vertically curled portion curled into a substantially vertically elliptical shape inward by pressurization and / or heat and pressure, and the inner side of the vertically curled portion is an outer surface of a torso just below an edge of the paper cup body. The lower portion of the paper cylinder is bent inward so as to wrap the annular leg of the paper cup body to form a folded portion, and the inner side of the distal end portion of the folded portion and the annular leg are formed. Fix the inner surface of the part with adhesive A paper insulation cup, characterized in that a heat-insulating space layer between the paper cup body barrel and paper cylindrical body.

[0008] As described above, the lower portion of the paper cup main body is formed such that the diameter of the peripheral edge of the annular leg portion is larger than the diameter of the bottom peripheral edge of the paper cup main body, and the upper portion of the paper cylinder is pressurized and / or heated and pressurized. Along with forming a vertically curled portion curled into a substantially vertically elliptical shape, the inner surface side of the vertically curled portion is brought into contact with the outer surface side of the body directly below the edge of the paper cup main body and fixed, and the lower part of the paper cylinder is fixed. A paper cup in which the paper cup body is bent inward so as to wrap the annular leg of the paper cup main body so as to form a folded portion, and an inner surface of a tip portion of the folded portion and an inner surface of the annular leg are fixed with an adhesive. Since the heat insulation space layer is provided between the main body and the paper cylinder, the annular leg of the paper cup body is not visible inside the paper cylinder when viewed from the side, and the heat insulation space layer is at the bottom. It will not be very thin even in the vicinity Also, the lower part of the paper cup main body is formed so that the diameter of the peripheral edge of the annular leg part is larger than the diameter of the bottom peripheral edge of the paper cup main body. Even when the paper cylinder is strongly gripped, the paper cylinder is hardly bent and hardly heated.

Further, the lower portion of the paper cylinder is bent inward so as to wrap the annular leg of the paper cup body to form a folded portion, and the inner surface of the distal end portion of the folded portion and the inner surface of the annular leg are formed. Since the paper cup is fixed via the adhesive, the paper cup main body and the paper cylinder are not separated.

According to a second aspect of the present invention, in the first aspect, the inner surface of the vertically long curled portion of the paper cylinder and the outer surface of the body of the paper cup body are fixed with an adhesive. Paper insulation cup.

If the inner surface of the vertically long curl portion of the upper portion of the paper cylinder and the outer surface of the body of the paper cup body are fixed with an adhesive, the lateral pushing strength (lip strength) of the heat insulating cup increases.

The lateral pushing strength (lip strength) is the strength of the edge of the cup in the lateral pushing direction, and is a quality item particularly required for a heat-insulating cup for instant noodles. When gripping and eating, if the lip strength is weak, the cup will be deformed when held by hand, making it difficult to eat, and the contents will be easily spilled.

In a third aspect of the present invention, there is provided a paper cup forming step for manufacturing a paper cup body, wherein the annular leg is formed so that the diameter of the peripheral edge of the annular leg of the molded paper cup body is larger than the diameter of the bottom peripheral edge. Circular portion for expanding the annular leg portion, expanding the paper cylinder blank into a sleeve shape, and forming an inwardly curled portion on the upper peripheral edge of the sleeve and a bent portion for inwardly bending the lower peripheral edge thereof. , Bending part forming step, applying a substantially horizontal force outward to the curled part formed on the upper peripheral edge and the bent part formed on the lower peripheral edge, respectively, a vertically curled part, a crushing step of forming a folded part, After applying the adhesive to the inside of the folded part of the processed paper cylinder, the paper cylinder is fitted into the paper cup body, and the inner surface of the vertical curl portion and the outer surface of the trunk just below the lip are contact-fixed, and the ring is formed. leg Is inserted into the fold, and the inner surface of the annular leg and the inner surface of the fold are adhesively fixed to each other. is there.

By producing a heat insulating cup through each of the above steps, a paper heat insulating cup having good appearance, excellent heat insulating effect, and excellent lateral pressing strength can be obtained.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to embodiments. The paper heat-insulating cup of the present invention includes, for example, as shown in FIG. 1, a body 11 and a bottom 12, an opening 13 having an edge 13 curled outward, and a joint between the body and the bottom. A paper cup body 10 having an annular leg 14 formed thereon;
It consists Paper tubular body 20 for being fitted into the body portion outer side of the paper cup body, the diameter D ₁ of the annular leg 14 distal the periphery is larger molded than the bottom rim of the diameter D ₂ of the paper cup body.

The paper cup body 10 has a basis weight of 170 to 400 for both the body member forming the body and the bottom member forming the bottom.
It can be produced by setting a polyethylene-coated paper in which a low-density polyethylene resin is applied on both sides or one side of a paper cup base paper of about g / m ^{2 to} about 10 to 50 μm in a general paper cup molding machine.

For example, a polyethylene-coated paper for a trunk member was set in a punching machine to obtain a fan-shaped trunk blank 111a having a predetermined size and shape. Further, the polyethylene processed paper for the bottom member was slit into a predetermined size to form a bottom member winding 121a.

Next, using a general paper cup forming machine, first, the body member blank 111a is heat-sealed to the fan-shaped side portion by using a mandrel (not shown), and the cylindrical body is narrowed downward. It was formed into a member 111. The bottom member was wound up into a substantially circular shape, and was punched and formed into a bottom member 121 having an outer peripheral edge rising downward. Next, hot air is blown to the inner surface of the body member 111 and the outer surface of the bottom member 121 while joining the outer surface of the outer peripheral edge of the bottom member 121 to the lower inner surface of the body member 111. Next, the lower end edge portion (which is an upper end portion in the figure) of the trunk member is folded inward using an in-curl mold (not shown) so as to cover the upright outer peripheral portion of the bottom member. When the outer peripheral portion of the base member and the standing member are pressed with a knurl (not shown), the folded inner surface of the body member is fused to the outer surface of the bottom member to form a paper cup body having a complete bottom structure (FIG. 2).
reference).

A method of forming a paper cup body having a widened annular leg, which is one of the features of the present invention, will be described in detail. There are two molding methods. The first method is a method suitable for the case where the angle θ at which the annular leg portion shown in FIG. 3 is expanded is relatively small, such as 1 ° to 20 °, and the second method is the method shown in FIG.
Is a relatively large value of 5 ° to 35 °.

The first method will be described in detail. First, as described above, a paper cup body is formed from a body member and a bottom member by a general paper cup forming method.

Then, while the annular leg is still hot,
Spread the annular leg outward. According to this method, the paper cup main body 10 is inserted into the female mold K that has been split into two upper and lower parts in the horizontal direction, and the mandrel-shaped male mold K3 is inserted into the paper cup main body to fix the paper cup main body. Up and down 2 in the horizontal direction
The split female mold K is divided into upper and lower split molds (upper female mold K1 and lower female mold K2) at the bottom of the paper cup body. The lower female mold K2 has a shape cut from the upper end edge by an angle θ for expanding the annular leg.

When the knurl R is inserted into the inside of the annular leg 14 and pressed while rotating the knurl, the annular leg extends at an angle of θ in the direction of the lower female die K2, and the diameter of the tip of the annular leg becomes D ₁ . spread. Instead of knurling, expansion member can be expanded diameter of the distal peripheral edge of the annular leg be spread inserted into the annular leg on the D _1. The splitting of the female mold is necessary to make it easier to remove the paper cup body from the female mold (see FIG. 3).

The second method will be described in detail. The polyethylene processed paper for the trunk member was set in a punching machine to obtain a fan-shaped trunk member blank 111b having a predetermined size and having a triangular expansion portion 111c provided at the lower end of both ends as shown in FIG.
In addition, the bottom member polyethylene-processed paper was slit into a predetermined size to obtain a bottom member winding 121b.

Then, using a general paper cup forming machine, first, the body member blank 111b is heat-sealed 11a using a mandrel (not shown) except for the portion where the fan-shaped side portion is provided with the expanding portion 111c. Then, it was formed into a cylindrical body member 111 ′ tapered downward. Further, from the winding of the bottom member, a bottom member 121 ′ having a substantially circular shape and an outer peripheral edge rising downward was punched and formed.

The bottom member 12 is formed on the lower inner surface of the body member 111 '.
Hot air is blown to the inner surface side of the body member and the outer surface side of the bottom member while joining the outer surfaces of the outer peripheral edges of 1 ′. Then, the lower edge of the trunk member is folded inward using an incaruring mold so as to cover the raised outer peripheral portion of the bottom member, and the folded trunk member and the raised outer peripheral portion of the bottom member are crimped using a knurl. Then, since the holding die K4 described later is cut outward at an angle θ from a position corresponding to the base portion of the annular leg,
The raised outer peripheral portion of the bottom member is expanded, and the raised portion of the bottom member and the lower end portion of the trunk member are completely heat-sealed including the triangular expanded portion 111c to form an annular leg peripheral portion having an angle θ. paper cup body diameter of D ₁ can be produced.

Here, a pressing die K4, which can be adhered to when forming the annular leg, is provided outside the body of the paper cup body. As described above, this holding die is cut outward from the portion corresponding to the base point of the annular leg at an angle θ.

The paper cylinder 20 has a basis weight of 190 to 420 g.
Using a paperboard such as a coated ball, a white liner, and a cup base paper of about / m ² as a material, punching into a substantially fan shape having a predetermined size large enough to cover a body portion and an annular leg portion of a paper cup body, to produce a paper cylinder blank. . In addition, when the cup base paper is used, the pulp is easily stretched and has good moldability, so that a vertically long curled portion and a folded portion described later are easily formed.

Next, the both ends of the paper cylinder blank are overlapped and bonded to each other via, for example, an ethylene-vinyl acetate resin-based emulsion adhesive to form a cylinder. Alternatively, a low-density polyethylene resin may be applied to the back surface of the paper cylinder blank and adhered by heat to be processed into a cylindrical shape.

The cylindrical body processed into a cylindrical shape is pressurized and / or heated using an incurling mold to form a winding portion in which the upper end of the cylindrical body is curled inward. At the same time, the lower end of the cylindrical body is also curled so as to be largely folded inward by pressurization and / or heat and pressure using an in-curl mold to form a folded portion 22.

In the curl portion, an expansion member is inserted into the inside of the cylindrical body, and is expanded in the horizontal direction to crush the curl portion, thereby forming the vertically long curl portion 21. others,
The curl portion may be crushed while rotating the knurled member to form the vertically long curl portion 21.

The fitting of the paper cylinder 20 into the paper cup body 10 is performed as follows. That is, the paper cup body is fitted into the paper cylinder from the bottom, and the upper end of the vertically long curled portion 21 of the paper cylinder is below the edge 13 of the paper cup.
The inner surface of the vertically long curled portion 21 is fixed by contacting the outer surface of the body of the paper cup, and the lower end of the paper cylinder is placed so that the annular leg 14 is wrapped inside the folded portion 22. The inside of the tip portion 23 and the inside of the annular leg 14 are
Either one or both are adhered with, for example, an ethylene-vinyl acetate resin emulsion adhesive. At this time, if the knurled member is pressed from the inside of the annular leg portion, the adhesion between the annular leg portion and the tip portion of the bent portion is ensured.

The lip strength is further improved by, for example, applying an ethylene-vinyl acetate resin-based emulsion-type adhesive to the inside of the vertically curled portion 21 and then fitting the paper cylinder 20 into the paper cup body 10. .

[0033]

EXAMPLES Examples of the present invention will be described below more specifically. <Example 1> First, a basis weight of 2 was used as a body member forming a body part.
A polyethylene processed paper obtained by applying a low-density polyethylene resin having a thickness of 30 μm to one side of a 40 g / m ² cup base paper,
In addition, as a bottom member forming the bottom, a basis weight of 200 g / m ^{2 is used.}
Prepare a polyethylene-coated paper coated with a low-density polyethylene resin with a thickness of 30 μm on one side of a cup base paper, and use a general paper cup molding machine, with polyethylene inside, height 105 mm, diameter 140 mm, bottom A paper cup body having a diameter D _{2 of} 106 mm, a height (depth) of the annular leg of 10 mm, a height of the rim of 5 mm, and a taper angle of 7.5 ° was formed.

Then, while the annular leg is still hot, the paper cup body 10 is placed in the female mold K which has been split into two upper and lower parts in the horizontal direction.
And a cylindrical female mold K in the paper cup body.
Insert 3 and fix the paper cup body. The female mold K split into two upper and lower parts in the horizontal direction has two upper and lower parts at the bottom of the paper cup body.
There are two split molds (upper female K1 and lower female K2). The lower female die K2 has a shape cut away from the upper end edge by an angle θ for expanding the annular leg.

When the knurl R1 is inserted into the inside of the annular leg 14, and the knurl is pressed while rotating, the annular leg 14 extends at an angle of θ in the direction of the lower female die K2, and the diameter D ₁ of the tip of the annular leg ₁₄ becomes 108 mm.

Separately, using a coated ball having a basis weight of 270 g / m ² , a fan-shaped paper cylinder blank having a predetermined size is prepared, and both ends of the fan-shaped cylinder blank are overlapped with each other.
Bonded via a vinyl acetate resin emulsion type adhesive, upper diameter 138 mm, lower diameter 100 mm,
It was shaped into a sleeve with a taper angle of 6.8 °.

Subsequently, the sleeve blank is heated and pressed using an in-curl mold to form a curled portion in which the upper edge is curled inward, and the lower edge is largely folded inward. Curling is performed to form the fold 22.

The curl portion is inserted and expanded horizontally to crush the curl portion to form a vertically long curl portion 21. Also, the curled folded portion 22
Is also folded in two, and the tip portion is a folded tip portion 23.

Finally, ethylene
A vinyl acetate resin-based emulsion adhesive is applied, and the vertically curled portion 2 is placed from the bottom of the paper cup body 10.
The paper curl 20 coated with an ethylene-vinyl acetate resin emulsion adhesive is inserted into the inside of the inside 1, and the vertically curled portion 21 is bonded and fixed to the outside of the body 11 below the lip, and the folded portion 22. Is fixed so as to enclose the annular leg portion 14 and pressed by a knurled shape from the inside of the annular leg portion, the adhesion between the annular leg portion 14 and the folding tip 23 becomes more reliable.

Comparative Example 1 First, both the body member and the bottom member had a thickness of 30 g on one side of a cup base paper having a basis weight of 270 g / m ^2.
A polyethylene-coated paper coated with a low-density polyethylene resin having a thickness of μm was prepared, and a paper cup body having the same dimensions as in Example 1 with the polyethylene surface inside was molded using a general paper cup molding machine.

Then, an embossed 100 g / m ² bleached kraft paper is adhered to the body of the paper cup body, and a 270 g / m ² coat is applied on the embossed bleached kraft paper. A heat insulating cup of Comparative Example 1 in which a ball was stuck to form a heat insulating space layer was produced (FIG. 5).
reference).

Comparative Example 2 First, a paper cup body was prepared in the same manner as in Comparative Example 1. However, as the polyethylene-processed paper, one obtained by applying a low-density polyethylene resin having a thickness of 25 μm to one surface of a cup base paper having a basis weight of 260 g / m ² was used.

Separately, a paper cylinder having a curled portion formed curled inward at the lower periphery using a coated ball of 270 g / m ² was prepared.

The paper cylinder is fitted into the body of the paper cup body, the lower edge of the cylinder having the curled portion is adhered and fixed to the lower edge of the paper cup body, and the upper edge of the paper cylinder is fixed. The heat insulating cup of Comparative Example 2 was produced in which the peripheral edge was in contact with and fixed to the lower edge of the lip of the body, and a heat insulating space layer was formed between the paper cup body and the paper cylinder (see FIG. 6). ).

The heat-insulating effect (holding time, surface temperature) and lip strength of the three types of paper heat-insulating cups thus produced, one in Example and two in Comparative Example, were measured and evaluated by the following methods. Table 1 shows the results. Retention time 持 ち Hold the heat-insulated cup with hot water in both hands and measure the retention time for how long it can be retained. Surface temperature 測定 Measure the temperature inside the heat-insulating cup (the midpoint in height) with a surface thermometer. Lip strength 紙 Place the paper insulation cup sideways and
0 mm / sec. Crush at the speed and measure the maximum strength at that time.

[0046]

[Table 1]

[0047]

As described above, in the paper heat insulating cup of the present invention, the stack pitch can be changed or the cup can be easily separated when the cup is filled by changing the taper angle between the paper cup body and the paper cylinder. Due to the concave shape of the body of the paper cup body, the paper cylinder is hardly bent and hardly heated even when gripped strongly. Since the end face of the printing portion of the paper cylinder does not come out, ink is not removed from the cup body generated when the cups are stacked. The print is beautiful because it is not foamed. Since the thread cutting portion is entirely adhered to the paper cylinder, the appearance from the bottom surface is good, and even if hot water is spilled, there is no penetration of hot water from the paper end surface.

[Brief description of the drawings]

FIG. 1 is a partially sectional explanatory view showing one embodiment of a paper heat insulating cup of the present invention.

FIG. 2 is a schematic explanatory view showing an example of a manufacturing process of a paper cup main body used for the paper heat insulating cup of the present invention.

FIG. 3 is a schematic explanatory view showing an example of a step of a diameter expanding operation for expanding a diameter of a distal end of an annular leg portion of a paper cup main body used for a paper heat insulating cup of the present invention.

FIG. 4 is a schematic explanatory view showing another example of the step of expanding the diameter of the distal end of the annular leg of the paper cup body used in the paper heat insulating cup of the present invention.

FIG. 5 is a partial sectional explanatory view showing an example of a conventional paper heat insulating cup.

FIG. 6 is a partial cross-sectional explanatory view showing an example of another conventional paper heat insulating cup.

[Explanation of symbols]

1 Insulation cup made of paper 10 Paper main body 11 Body 12 Bottom part 13 Edge 14 Edge ring 20 Paper cylinder 21 Vertical curl part 22 Fold Part 23 {Folding part tip (returned part) 30} Heat insulation space layer 11a {Heat fusion part 111, 111 '} Trunk member 121, 121' {Bottom member 111a, 111b} Trunk member blank 121a , 121b ‥‥ bottom member winding D ₁ ‥ annular leg diameter K of the bottom peripheral edge of the distal end periphery of the diameter D ₂ ‥ cup body ‥‥ female K1 ‥ upper female K2 ‥ lower female K3 ‥ male K4 ‥ Hold down type R ‥‥ knurl

Claims (3)

[Claims] 1. A paper cup body comprising a body and a bottom, wherein the periphery of the opening has an outer edge curled outward, and an annular leg is formed at a joint between the body and the bottom. A paper heat insulating cup composed of a paper cylinder fitted to the outside of the body, wherein the lower part of the paper cup body is formed such that the diameter of the peripheral edge of the annular leg tip is larger than the diameter of the bottom peripheral edge of the paper cup body. The upper portion of the paper cylinder forms a vertically curled portion curled in a substantially vertically elliptical shape inward by pressurization and / or heat and pressure, and the inner surface side of the vertically curled portion is the edge of the paper cup body edge. Contact the outer surface of the trunk directly below and fix it.
The lower part of the paper cylinder is bent inward so as to wrap the annular leg of the paper cup body to form a folded portion, and the inner surface of the distal end of the folded portion and the inner surface of the annular leg are bonded with an adhesive. A heat insulating space layer provided between the body of the paper cup body and the cylindrical body of paper, fixed through the paper. 2. The heat insulating cup made of paper according to claim 1, wherein the inner surface of the vertically long curled portion of the upper portion of the paper cylinder and the outer surface of the body of the paper cup main body are fixed with an adhesive. 3. A paper cup forming step for producing a paper cup main body, wherein an annular leg portion is expanded so that a diameter of a tip peripheral portion of the annular leg portion of the formed paper cup main body is larger than a diameter of a bottom peripheral edge. A step of processing the paper cylinder blank into a sleeve shape, forming a curled portion that bends inwardly on the upper peripheral edge of the sleeve, and a bent portion that bends inwardly on the lower peripheral edge thereof, a curl portion, a bent portion forming step, A crushing step of applying a substantially horizontal force outwardly to the curled portion formed on the upper peripheral edge and the bent portion formed on the lower peripheral edge to form a vertically long curled portion and a folded portion, respectively, a processed paper cylinder After applying adhesive to the inside of the folded part of the body, the paper cylinder is fitted into the paper cup body, and the inner surface of the vertically curled part and the outer surface of the trunk just below the lip are fixed in contact, and the annular leg is folded into the folded part Insert 2. The method for producing a paper heat insulating cup according to claim 1, comprising the steps of: inserting and fixing a paper cup main body to a paper cylinder body, whereby the inner surface side of the annular leg portion and the inner surface side of the bent portion are bonded and fixed.