JP3443732B2 - Food paper cup and its manufacturing method - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cup for drinking food such as cooked confectionery, retort foods, dairy liquid foods, etc., which is made of paper such as kraft paper having a cup-shaped lower side tube (so-called paperboard). Regarding the improvement of.

[0002]

2. Description of the Related Art Many beverage cups have a side tube made of paper or plastic, and paper cups have the same shape (length, thickness) of paper fibers and the fibers are even. "Paper base paper" having a paper thickness of 225 g / m ² or more, which is specially prepared as a paper cup, as described above. Baked confectionery and retort food paper cups are slightly coarser kraft paper than "cup base paper", that is, 40-
A thin paper or a so-called cup base paper, which is as thin as 180 g / m ² and has a rough surface, which is small in uniformity and easy to tear, is used.

That is, the reason why a slightly coarse and inexpensive thin paper for a paper cup is used for a baked confectionery or a retort food paper cup side tube is that the kraft paper and the like have particularly long heat resistance because of their long tissue fibers. In addition, the degree of chemical treatment is less than that of the cup base paper, so it has corrosion resistance and is also cheaper in terms of food hygiene, due to the oil and fat flowing into the container paper during heating of the oil and fat content in the baked confectionery seeds. The main reason is that the unbleached kraft paper is not noticeable in the unevenness of the transparent portion.

As a conventional baked confectionery paper cup (paper container) made of thin paper, the registered utility model No. 301
There is one disclosed in Japanese Patent No. 8132. This conventional example is shown in FIG.
As shown in FIG. 2, a blank 1 made of a substantially arc-shaped strip of paper is rolled in its length direction, and its end portions 1a are bonded to each other by a bonding portion 2
Bonded with a hollow frusto-conical cup side tube (so-called cylinder paper)
3 is made, and when making a paper cup in which the bottom paper 4 is joined to the inner peripheral surface of the small diameter peripheral portion 3a, the extra long peripheral surface portion 3b is present in the small diameter peripheral portion 3a of the cup-side tube 3 to form a round plate shape. Bottom paper 4
23A, and the bottom surface peripheral surface 4a of the extra length peripheral surface portion 3b is positioned as shown in FIG. 23B.
As shown in FIG. 23C, it is wrapped in from the outside and folded at right angles twice, and the folded portion 60 is further folded inward at right angles as shown in FIG. By using the crushed paper joint 17
The bottom cylinder 4 and the bottom plate of the thermally processed cake paper cup C'in which the bottom paper 4 is joined to the end of the small-diameter peripheral portion 3a of the cup-side cylinder 3 are joined together.

[0005]

The above-mentioned many times of the right-angled fold and crush joint portion 17 in this conventional example requires many steps for its formation, is troublesome, troublesome and is not suitable for mass production, and further, the above-mentioned many times of folding. Due to the phenomenon of wrinkling due to the rigidity of the multiple polymerized paper due to the overlapping and crushing, a large number of vertical wrinkle polymerized irregularities are formed on the lower end peripheral surface of the cup-side tube 3. In these uneven portions, the height of the peripheral surface 4a of the bottom paper is 10 to 20 times the thickness of the bottom paper (about 1 to
If it is relatively low within 2 mm), it is not conspicuous and there is no problem. However, in order to increase the bonding strength of the bottom paper peripheral surface 4a to the inner peripheral surface of the small diameter end of the side tube 3, its height is 30 to 30 mm of the bottom paper thickness. When the height is set 50 times as large as about 3 to 5 mm, the peripheral surface 4a of the bottom paper is
22 and FIG. 23 (C) show the protrusion protrusions 18 of about 0.1 to 0.3 mm due to the large number of the irregularities and the irregularities based on the folded and crushed joint of the multi-polymerized paper. Paper 4
A large number are generated on the outer peripheral surface of the lower portion of the side cylinder 3 in the vicinity of

Therefore, after stacking (stacking) a large number of cups C'having the protruding protrusions 18 of the cup side cylinder 3 as shown in FIG. 24, the user stacks the cups C from the cup stacking body. When pulling out ′ one by one and separating,
The protruding protrusion 18 is formed on the inner surface of the cup on the outer side thereof.
As shown in Fig. 4, since 0.1 mm to 0.3 mm has been bitten in, and the lower edge of each side cylinder is a bent corner peripheral surface, it is angular, so air enters between each bottom paper. Due to the difficulty, there is an essential and serious problem that it is extremely difficult to separate the cups individually and the workability thereof is significantly impaired.

In addition to the above-mentioned conventional example, as a conventional example in which unevenness is provided on the lower cup side cylinder to facilitate separation of a single cup from a cup stack, the applicant previously proposed the registration. As described in Utility Model No. 3046289, a roll paper or a sheet of paper is embossed with a predetermined pattern of folds, patterns, letters, etc., and both ends of a punched fan-shaped blank are glued to form a hollow conical cylinder. In a state in which a kneaded confectionery cane is housed inside a cup having a peripheral wall (cup side cylinder) molded into and a bottom plate inserted into the bottom of the peripheral wall, the product is baked or steamed to be integrated with the confectionery. Cups for heat-processed confectionery are also well known.

However, even in this conventional example, the outer surface of the joint between the cup-side tube and the bottom paper is still square and a large number of protrusions are formed, so that it is difficult to separate the above-mentioned individual products by the protrusions. However, there is a problem that it has not been possible to solve the problem that the difficulty of separating the single products due to the difficulty of air entering between the bottom sheets.

According to the present invention, in order to eliminate the above-mentioned problems, the surplus peripheral surface is left on the lower inner peripheral surface of the side cylinder that is widened upward so that the downward peripheral surface of the inverted round plate-shaped bottom sheet is formed. While locating the contact surface, by wrapping the bottom paper peripheral surface from the bottom to the inside with the extra length peripheral surface and curling the upper part of the bottom paper peripheral surface together with the side cylinder in a round shape, the protruding part protrudes around the lower part of the side cylinder. Without making it possible to easily and quickly form a bottom paper joint where the lower edge of the cup is rounded, and to form a slanted edge in connection with the curl portion, a large number of stacked cups can be formed. The repulsive action of the bullet edge with respect to the bottom paper makes it possible to lift and slide well, and it is easy to allow air to enter between the cup bottom papers, so that the individual cups can be easily and quickly separated from the cup stack. The purpose is to

[0010]

DISCLOSURE OF THE INVENTION The above-mentioned object of the present invention is to roll up a side tube blank in which paper is formed into a substantially arcuate strip shape in the length direction, and to spread the side edges by adhering the side edges with an adhesive portion. When making a cup with a cup side tube and joining a bottom paper to the lower inner peripheral surface of the side cylinder, the extra long peripheral surface is left on the lower inner peripheral surface of the side cylinder to face the inverted round plate bottom paper downward. The peripheral surface is tangentially oriented, and the peripheral surface of the bottom paper is wrapped from the bottom to the inside by the extra length peripheral surface to form a folded peripheral surface, and the upper part of the peripheral surface of the bottom paper together with the side cylinder in contact with the peripheral surface. While pressing the surface, the lower peripheral surface is evenly rolled inwardly to form a curl portion, and the curl portion is sandwiched between the upper portion of the curl portion and the bottom surface of the bottom paper, and the end portion of the side cylinder passing through the folded peripheral surface is sandwiched. By crushing only the inside of the curl part along the bottom surface of the bottom paper in a ring shape, the downward inclination The sides and bottom paper junction formed respectively, could be achieved by joining the bottom paper to the side cylinder lower inner peripheral surface at the junction.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described with reference to the drawings. First, the basic form of the present invention is
As shown in FIG. 1, a side tube blank 1 formed by forming a thin kraft paper of about 40 to 180 g / m ² into a substantially arc-shaped strip is rounded in the length direction, and its end sides 1a are bonded together. Cup side cylinder (so-called paperboard) that spreads by adhering with 3
In order to make a cup in which the bottom paper 4 is joined to the lower inner peripheral surface thereof as shown in FIG. 1, the extra long peripheral surface 3A is formed on the lower inner peripheral surface of the side cylinder 3 as shown in FIGS. The bottom peripheral surface 4A of the bottom plate 4 in the shape of a circular plate is adhered or the contact surface is localized by using a well-known movable mandrel M.

Next, around the lower end portion 3 of the extra length circumferential surface 3A
By lowering the movable mandrel M, B is started to curl inward by a well-known first curl machine M1 as shown in FIGS. 4 and 5, and this is further moved horizontally by the movable mandrel M, and then the movable mandrel M is moved horizontally. Second curl machine M2 shown in
Then, as shown in FIGS. 8 and 9, the mandrel M is lowered to continue the curl and make a U-turn in a round shape.
Then, by lowering the mandrel M, as shown in FIGS. 10 and 11, the folded peripheral surface 5 is formed by wrapping the bottom paper peripheral surface 4A from the bottom to the inside with the extra length peripheral surface 3A.

Next, the side cylinder 3 having the peripheral surface 5 is moved by the horizontal movement of the movable mandrel M, and the third curl machine M3 and the pressing machine M4 as shown in FIGS.
Each of these machines M
As shown in FIG. 12, M3 and M4 float in the annular groove 12 in the upper part near the outer circumference of the bottomed ring-shaped base 11 made of a tough material such as metal, while being kept horizontal by a large number of push-up springs 13. Strong curl ring 14 and base 11
On the bottom surface 11a of the above, there is a push-up die 16 made of a tough material that is strongly levitated by a spring-repellent spring 15 having a push-up elastic force higher than that of the spring. However, the curl ring 14 which is floated by the spring 13 and the push-up die 16 which is floated by the elastic spring 15 are respectively well-known upper limit stoppers (not shown).
This prevents the base 11 from being pulled out above the position shown in FIG.

Next, the movable mandrel M is moved from the state in which the bottom paper 4 is brought into contact with the push-up die 16 in each of the machines M3 and M4 as shown in FIGS.
As shown in FIG. 15, by lowering the springs 13 and 15 against the push-up resilience, the upper part of the bottom paper peripheral surface 4A and the side cylinder 3 contacting the upper surface of the bottom paper peripheral surface 4A are moved toward the outer peripheral surface of the side cylinder as shown in FIG. While tightly sandwiching the inner peripheral surface 14A of the curl ring 14 and the movable mandrel M, the lower peripheral surface of the curl ring 14 is evenly rounded inward as shown in FIG. You can make 6.

Thereafter, by further lowering the movable mandrel M, as shown in FIG. 15, the end portion periphery 3B of the side cylinder 3 passing through the folded peripheral surface 5 between the upper portion of the curl portion 6 and the lower surface of the bottom paper. As shown in FIG. 17, only the inner peripheral portion 6A of the curl portion 6 is sandwiched as shown in FIG.
The inner upper edge 11B of the movable mandrel M and the lower surface of the movable mandrel M can be firmly overlapped and crushed in a ring shape along the lower surface of the bottom paper, and an inclination angle (for example, 10 ° to 60 °) corresponding to the outer peripheral oblique side 16A of the push-up die 16 can be obtained. ), The movable mandrel M is attached to the movable mandrel M after forming the downward inclined bullet edge 7 and the bottom paper joint portion 8 respectively.
As shown in FIG. 1 in which the bottom paper 4 is joined to the inner peripheral surface of the lower portion of the side cylinder by the joining portion 8 by forcibly removing the inclined bullet piece 7 from the pushing-up die oblique side 16A against its resilience, as shown in FIG. It was possible to make a food cup C according to the invention as shown.

In summary, according to the present invention, the downward peripheral surface 4A of the bottom paper 4 is wrapped inward from the outer side to the inner side by the above-mentioned curling means by the extra length peripheral surface 3A in the lower part of the cup side cylinder (body paper) 3. As shown in FIG. 8 and FIG. 9, it is possible to form a folded back peripheral surface 5 which begins to curl in a round shape and in which a U-turn is made into a round U shape of the surplus peripheral surface 3A as shown in FIG.
As shown in FIG. 15, the movable mandrel M having the outer peripheral surface of the side cylinder 3 in contact with the downward peripheral surface 4A of the bottom paper 4 inside the side cylinder 3 and the inner peripheral surface 14A of the curl ring 14 together with the bottom peripheral surface 4A. The outer peripheral surface of the side cylinder 3 is tightly pinched, and the lower peripheral surface of the curl ring 14B of the curl ring 14 can be uniformly curled and curled as shown in FIGS. At the bottom of the
The protruding protrusion 18 generated as shown in each of FIGS. 22 to 24 due to the wrinkling phenomenon of the side cylinder in the above-described conventional example due to the right-angle bending is the rounding of the lower side cylinder by the curl portion 6 of the present invention. It does not occur in the curled bottom paper joint structure.

Further, in the present invention, the tip end portion passing through the bottom paper joining portion 8 connected to the rounding curl portion 6 is formed as the slanted bullet edge 7 utilizing the inherent rigidity of the side cylinder 3 and the bottom paper 4. The bullet edge 7 has a bending elastic force such that it is slightly bent when pressed gently toward the bottom paper 4 with a finger and becomes nearly horizontal, and when the finger is released from the bullet edge 7, the inclined bullet edge 7 has an original inclination angle ( 10 ° to 60
Return to °). Further, the bottom paper joining portion 8 in FIG.
It is possible to increase the bending amount of the bullet edge 7 and its restoring force by making the width L1 of the bullet edge 7 as small as possible and the length L2 of the inclined bullet edge 7 as large as possible.

The paper cup according to the present invention has the above-described structure, and the surplus circumferential surface 3A is left on the inner peripheral surface of the lower side of the cup-side tube 3 which is widened upward, and the downward peripheral surface of the bottom paper 4 in the shape of an inverted round plate. 4A
While locating the contact surface and wrapping the bottom paper peripheral surface 4A from the bottom to the inside by the extra length peripheral surface 3A and curling and curling,
By crushing the peripheral surface of the curl portion 6 into a ring shape,
It was possible to form a rounded curl portion 6 and a bottom paper joint portion 8 on the lower edge of the cup, and it was possible to eliminate the protruding protrusion around the lower portion of the side cylinder.

Therefore, a large number of cups C according to the invention
As shown in FIG. 19, the cups in the stacked cup stack can be slidable well,
Each of the cups in the cup stacking body can be stacked in a self-floating tendency due to the bending restoring elasticity of the inclined elastic side 7 provided at the tip of the bottom paper joining portion 8 and the inherent tension of the bottom paper 4, and this floating action and By rounding the lower edge of the cup inward and curling,
Since it became easier for air to enter between the bottom papers of the cups from the rounded bottom edge of the cup, it is extremely easy to separate the cup C from the cup stack together with the self-floating action of each cup. Became.

[0020]

Example: The height of the cup C is 50 mm and the diameter of the opening edge is 70 mm.
20 and 21 in which the opening angle is 7 mm on one side.
In the example shown in, in order to set the length L2 of the slanted bullet edge 7 to 2 mm and the distance between the tip of the slanted bullet edge 7 and the bottom surface of the bottom sheet to 1 mm, the slant angle θ of the slanted bullet edge 7 is calculated from sinX ° = 1/2. It suffices that X = 30 °, and this bullet edge 7 can be realized by setting the outer peripheral oblique side 16A of the pushing die 16 in accordance with the above specifications.

The cushioning effect (self-levitation effect) of the stacked cups by the inclined elastic edges 7 is set so that the bending heights of the many inclined elastic edges 7 are each 0.5 mm.
When pushing the uppermost part of the individual cup stacks with the fingers, the uppermost cup can be lowered by about 12 mm including the bending of the bottom paper 4, and by releasing the fingers, each cup is replaced with the original one. It was confirmed that the cups were restored to the height and that the cups in the stack of cups could slide up and down very easily with "fluffy", and in fact, the individual separation of the cups became significantly easier. Further, as the adhesion means in each of the third and fourth aspects of the invention,
In addition to bonding with a paste, heat seal bonding of a heat-sealable resin layer laminated on the inner surface of the preload side cylinder or the peripheral surface of the bottom paper can also be adopted, and in this example, it can also be used as a beverage cup.

Even if the confectionery or the retort food is put in the cup C according to the present invention, the confectionery or the viscous fluid does not leak from the bottom paper joint portion 8 and is baked in the furnace as it is. , Or steaming in a steamer, the confectionery seeds are heated and expanded, and the wheat starch in the confectionery seeds is converted into an edible baked confectionery or steamed confectionery. Since the curl is strongly curbed against the rigidity and the periphery of the joint is crushed and joined, the joint portion 8 does not undesirably curl or crush and the joint does not return or deform.

In other words, the type of confectionery in the cup C, that is, wheat starch, which occupies the majority of the "dough", is gelatinized by heating at 60 ° C. or higher, and is curled round from the lower inner wall of the cup side tube 3 into a curled portion 6 or bottom paper. The joint portion 8 is also glued and solidified. Since the cup side tube 3 is formed, the adhesive part 2 in which the both ends of the side tube blank 1 are bonded together is subjected to the expansion pressure due to the expansion before the wheat starch is gelatinized by heat, so that it is sufficient for the adhesion of this part. It is necessary to pour, but the lower part of the side cylinder and the bottom paper 4 are curled in a round shape, and then the periphery thereof is crushed.
The curl portion 6 and the curl portion 6 do not stick to the dough or other viscous materials when the dough or other viscous substance is filled with the paste or by the heat gelatinization after the filling even if the curl portion 6 is not adhered. There is no concern that the liquid will leak out.

It is also possible to put other ingredients such as gratin dough, noodles and other retort foods or instant foods in the cup C, and cook them in the cup C by heating, such as "drinking yogurt" or Drinkable food such as "drinking agar" can also be drunk after storage. Further, a portion indicated by reference sign m in FIG. 1 is a perforated cutting line for cutting the cup C into pieces for easy peeling. Further, the wall thickness of the cup C in each of the drawings is easy to understand. Therefore, it is exaggerated.

[0025]

Since the present invention employs the above-mentioned modes, it has the following effects. According to the invention of claim 1, the surplus peripheral surface 3A is left on the lower inner peripheral surface of the cup-side cylinder 3 which is widened upward, and the downward peripheral surface 4A of the inverted round plate-shaped bottom sheet 4 is formed.
While locating the contact surface and wrapping the bottom paper peripheral surface 4A from the bottom to the inside by the extra length peripheral surface 3A and curling and curling,
By crushing the inner peripheral surface 6A of the curl portion 6 into a ring shape, it is possible to form the rounded curl portion 6 and the bottom paper joint portion 8 without a corner at the lower edge of the cup. It was possible to eliminate the protruding part around the lower part of the side cylinder.

Therefore, a large number of cups C according to the invention
It is possible that the cups in the stack of stacked cups are slidable well, and the bending recovery elastic force of the inclined elastic side 7 provided at the tip of the bottom paper joint portion 8 and the intrinsic tension of the bottom paper 4 By this, each cup of the cup stack can be stacked in a self-floating tendency, and due to this floating action and curling by curling the lower edge of the cup inward, the roundness is given between the bottom papers of each cup. In addition, since air can easily enter from the lower edge of the cup, it has an excellent effect that separation of the single cup from the cup stack is significantly facilitated in combination with the self-levitation action of each cup.

According to the second aspect of the present invention, in addition to the above-mentioned effects, the overlapped horizontal width L1 of the inner peripheral portion 6A of the curl portion 6 is made as small as possible, so that the downward slanted bullet edge 7 is formed. Since the length L2 of the slant was set as large as possible,
It was possible to increase the amount of bending of the cup and its restoring elasticity, and to increase the floating effect of each cup in the cup stack.

In the third aspect of the present invention, since the surplus peripheral surface 3A is left on the lower inner peripheral surface of the side cylinder 3 and the downward peripheral surface 4A of the inverted round plate-shaped bottom sheet 4 is positioned by the adhesive, The curl portion 6 and the inner peripheral portion 6A thereof can be crushed more reliably and reliably, and the effect of preventing leakage of liquid food in a cup such as drinking food to the outside can be added.

According to the invention of claim 4, since the bottom paper joint portion 8 is adhesively reinforced, it becomes a cup having better shape-retaining property, and it is possible to prevent liquid food and drinkable food from leaking to the outside. Was able to be added.

In the present invention, since the perforated cutting line m is provided on the cup-side tube 3, the cup-side tube 3 can be easily shredded with fingers or the like, and the food containing the cup can be more easily eaten. The effect can be added.

Also in the invention of claim 6, in addition to the effect of the invention of claim 1, the curled portion 6 is formed, and the bottom paper joint portion 8 is formed by ring-shaped crushing of the peripheral portion thereof and the slanted ridge 7 is formed. Each process of forming is done manually by a curl jig, or
There is also an effect that it can be easily realized by the above-described curl molding crushing molding means.

[Brief description of drawings]

FIG. 1 is an enlarged vertical cross-sectional elevation view of a partly cutaway essential portion showing an example of a food paper cup according to the present invention.

FIG. 2 is a vertical sectional elevation view showing an example of a manufacturing process of a food paper cup according to the present invention.

FIG. 3 is an enlarged sectional view of an essential part of what is shown in FIG.

FIG. 4 is a vertical sectional elevation view showing an example of a manufacturing process of a food paper cup according to the present invention.

5 is an enlarged cross-sectional view of the main part of what is shown in FIG.

FIG. 6 is a vertical sectional elevation view showing an example of a manufacturing process of a food paper cup according to the present invention.

FIG. 7 is an enlarged sectional view of an essential part of what is shown in FIG.

FIG. 8 is a vertical sectional elevation view showing an example of a manufacturing process of the food paper cup according to the present invention.

9 is an enlarged cross-sectional view of the main part of what is shown in FIG.

FIG. 10 is a vertical sectional elevation view showing an example of a manufacturing process of the food paper cup according to the present invention.

11 is an enlarged cross-sectional view of the main part of what is shown in FIG.

FIG. 12 is a vertical sectional elevation view showing an example of a manufacturing process of the food paper cup according to the present invention.

FIG. 13 is an enlarged sectional view of an essential part of the one shown in FIG.

FIG. 14 is a vertical cross-sectional view showing an example of the manufacturing process of the food paper cup according to the present invention.

FIG. 15 is an enlarged sectional view of an essential part of what is shown in FIG.

FIG. 16 is a vertical sectional elevation view showing an example of a manufacturing process of the food paper cup according to the present invention.

FIG. 17 is an enlarged sectional view of an essential part of the one shown in FIG.

FIG. 18 is a vertical sectional elevation view showing an example of a manufacturing process of the food paper cup according to the present invention.

FIG. 19 is a vertical sectional elevation view showing an example in which a large number of the cups shown in FIG. 1 are stacked.

FIG. 20 is a vertical sectional elevational view showing the whole food paper cup according to the present invention.

FIG. 21 is an enlarged sectional view of an essential part of the one shown in FIG.

FIG. 22 is a vertical sectional elevation view showing an example of a conventional paper cup.

FIG. 23 is a cross-sectional view of essential parts showing an example of how to make a conventional paper cup.

FIG. 24 is an enlarged vertical sectional elevation view showing an example in which many conventional paper cups are stacked.

[Explanation of symbols]

1 Side cylinder blank 1a Side edge of side tube blank 2 Adhesive part between the side edges of the side cylinder blank 3 cup side cylinder (body paper) 3A cup side cylinder extra length peripheral surface 3B cup side tube end peripheral surface 4 Reverse round plate-shaped bottom paper 4A Inverted circular surface of bottom plate of inverted round plate 5 Folded peripheral surface 6 Curl section 6A Inside the curl area 7 Inclined bullet 8 Bottom paper joint m Perforated cutting line M movable mandrel M1 first curl machine M2 second curl machine M3 Third Curl Machine M4 pressing machine 11 Bottomed ring-shaped base 12 Annular groove around the upper part of the base 13,15 Repellent spring 14 curl ring 14A Inner surface of curl ring Curl curved surface of 14B curl ring 16 Push-up die 16A Push-up die outer peripheral hypotenuse Width of L1 bottom paper joint 8 L2 Inclined bullet length 7 length

Claims (6)

(57) [Claims] 1. A side tube blank 1 formed by forming paper into a substantially arcuate strip shape is rolled in a lengthwise direction, and its end sides 1a are bonded together.
In a cup in which the cup side tube 3 is spread by adhering with the bottom paper 4 and is joined to the lower inner peripheral surface of the cup side tube 3, the extra long peripheral surface 3A is left on the lower inner peripheral surface of the side tube 3 and is reversed. The downward peripheral surface 4A of the round plate-shaped bottom paper 4 is contact-orientated, and the extra length peripheral surface 3 is formed.
A bottom peripheral surface 4A is wrapped from the bottom to the inside by A to form a folded peripheral surface 5. Further, the upper peripheral surface 4A is pressed against the outer peripheral surface together with the side cylinder 3 which is in contact with the lower peripheral surface. Curl inwardly to make curl section 6,
The end periphery 3B of the side tube 3 passing through the folded peripheral surface 5 is sandwiched between the upper portion of the curl portion 6 and the bottom surface of the bottom paper, and only the inner periphery 6A of the curl portion 6 is formed into a ring shape on the bottom paper bottom surface. By squeezing them together along the line, the downward inclined bullet edge 7 and the bottom paper joint 8
And the bottom paper 4 are joined to the inner peripheral surface of the lower portion of the side tube at the joint portion 8. 2. The length L2 of the downward inclined bullet side 7 is made as large as possible by making the overlapping horizontal width L1 of the inner periphery 6A of the curl portion 6 as small as possible. Item 1
The listed food paper cup. 3. The lower peripheral surface 4A of the inverted round plate-shaped bottom paper 4 is adhered to the lower inner peripheral surface of the side cylinder 3 so that the surplus peripheral surface 3A remains on the lower peripheral surface 3A. Alternatively, the food paper cup according to claim 2. 4. The food paper cup according to claim 1, wherein the bottom paper joint portion 8 is adhesively reinforced. 5. The perforated cutting line m on the cup side tube 3
The food paper cup according to any one of claims 1 to 4, further comprising: 6. A side tube blank 1 in which paper is formed in a substantially arcuate strip shape is rolled in the length direction, and its end sides 1a are bonded together.
In a method for producing a cup in which the cup side cylinder 3 is spread by adhering the bottom side paper 4 to the lower inner peripheral surface of the cup 3 and the extra long peripheral surface 3A is formed on the lower inner peripheral surface of the side cylinder 3. The downward facing peripheral surface 4A of the inverted round plate-shaped bottom sheet 4 is left in contact with the surface, and the bottom peripheral surface 4A is wrapped from the bottom to the inside by the extra length peripheral surface 3A to form a folded peripheral surface 5, and The bottom surface 4
While curling the outer peripheral surface of the upper part of A together with the side cylinder 3 which is in contact with this, the lower peripheral surface is bent inward evenly to form a curl part 6, and the upper part of the curl part 6 and the bottom surface of the bottom paper are Around the end portion 3B of the side tube 3 passing through the folded peripheral surface 5 between
By sandwiching and crushing only the inner peripheral portion 6A of the curl portion 6 along the bottom surface of the bottom paper in a ring shape, a downward inclined bullet edge 7 and a bottom paper joint portion 8 are respectively formed, and this joint is formed. A method for manufacturing a food paper cup, wherein the bottom paper 4 is joined to the inner peripheral surface of the lower portion of the side cylinder at the portion 8.