JP2003341649A - Modified bottom paper cup - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a modified bottom paper cup free from leakage, having high sealability and stacking property compared with a known paper cup with a fake bottom having a bottom coaming part. <P>SOLUTION: This modified bottom paper cup is formed of a fan-shaped blank formed of a paper-based laminate. A cylindrical body has a barrel wall with a rectangular lower opening and an expanded upper opening. A bottom folding panel facing a lower part of the cylindrical body is folded inwardly while the panel is folded inwardly at each diagonal rule, and at the same time, a remaining facing bottom panel is folded inwardly. Rib parts continuous to lower sides of the bottom folding panel and the bottom panel are horizontally heat-sealed to each other to form a rib overlapping part in an H-shaped overlapping manner. The rib overlapping part is collapsed to one side and folded flat, and adhered to the bottom panel to form the flat rectangular bottom part. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a deformable bottom paper cup having a high sealing property and having no leakage.

[0002]

2. Description of the Related Art Conventionally, paper cups have been widely used for beverages, instant foods, etc. in vending machines. Also,
It is also used as a container for filling and sealing various beverages and selling them. The general shape of paper cup P is
As shown in FIG. 5, a fan-shaped body member 31 and a circular bottom member 3 are provided.
2, the outer peripheral edge portion of the bottom member 32 is bent downward at the bottom portion, the lower end portion of the body member 31 is folded back inward by 180 degrees, and the bent portion 33 is sandwiched between the body portion 31 and the body portion 31 by thermocompression bonding. The bottom member 32 is joined. This bottom member 32
The portion folded in with the bent portion 33 sandwiched therebetween is referred to as a thread twisting portion 34, and the bottom portion is a raised bottom. Wrinkles are likely to be formed on the thread twisting portion 34 in the process of folding the bottom member 32 with the bending portion 33 interposed therebetween. Further, in the step of folding the bottom member 32 with the bent portion 33 sandwiched and roasting it with hot air, the thread twisting portion 34
Pinholes are likely to occur in the vicinity, which causes the contents to leak out.

[0003]

However, in the conventional paper cup P having a general shape, as described above, the outer peripheral edge portion of the circular bottom member 32 is bent downward, and the bent portion 33 is sandwiched between the body member 31. When folding the bottom end of the
The inner surface of the folded-back portion is formed by scoring a knurled line and heat-pressing it, but structurally there is no leakage,
There is a problem that it is difficult to obtain a paper cup having a high sealing property. In addition, the bottom portion is a raised bottom, the storage capacity as a paper container is reduced, and it is not satisfactory in terms of space saving such as storage by stacking.

The present invention has been made by paying attention to the above problems, and in order to solve these problems, compared to the conventional paper cup of the raised bottom having a thread twisting portion, there is no leakage and sealing. It is an object of the present invention to provide a deformed bottom paper cup having high flexibility and suitability for stacking.

[0005]

As a result of studies to solve the above problems, the deformed bottom paper cup of the present invention according to claim 1 is a fan-shaped blank composed of a laminate having paper as a base material. And forming a tubular body having a trunk wall in which the lower opening is rectangular and the upper opening is widened by winding the blank, and the bottom folding panels facing each other at the lower portion of the tubular body are formed by diagonal ruled lines. Fold it inward while folding it inward through the circumferential creases, and at the same time fold the remaining opposing bottom panels inwardly through the circumferential creases, and then fold the bottom folding panel and the rib portion that is connected to the bottom side of the bottom panel. Horizontally heat-sealed so as to overlap with the shape of the letter to form a rib overlapping portion, and the rib overlapping portion was laid down on one side and flatly folded and adhered to the bottom panel to form the bottom portion into a flat rectangular bottom closing portion. thing A modified bottom paper cup, wherein.

Further, the upper edge of the body wall is curled outward to form a top curl portion, and the upper opening is circular, or the upper opening is rectangular with rounded corners.

According to the present invention, it is possible to mold from a single blank, and the bottom is a rectangular flat-bottom die, which is not a raised-bottom die having a thread twisting portion, so that there is no leakage, high sealing performance, and stacking. A deformed bottom paper cup with good suitability can be provided.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in more detail with reference to the drawings.

FIG. 1 is a perspective view showing an embodiment of a modified bottom paper cup according to the present invention. As shown in this figure, the modified bottom paper cup A is a paper cup in which the bottom portion 2 is a flat rectangular bottom closing portion without providing a thread twisting portion, and like the general paper cup, The upper edge of 1 is curled to the outside to form a top curl portion 3. The modified bottom paper cup A is assembled from a single blank.

FIG. 2 is a development view showing a blank 10 forming the above modified bottom paper cup A.

The blank 10 has a fan-shaped body portion 11 by an inner circumferential ruled line a and an outer circumferential ruled line b provided below the blank 10 and a circumferential bottom portion 12 connected to the body portion 11.
And a rib portion 13 continuous with the bottom portion 12, and these circumferential ruled lines a and b become horizontal when the blank 10 is wound and both ends thereof are bonded, and at the bonding portion, respectively. Engraved to match.

The bottom portion 12 and the rib portion 13 are provided with vertical ruled lines c, d, e and f extending from the lower end edge of the blank 10 toward the center of the fan. Rectangular bottom (half) panels 14, 15 on both sides
A rectangular bottom (all) panel 16 is defined in the center of the panel.

Furthermore, these bottom (semi) panels 14, 1
5 and the bottom (all) panel 16 are divided into folding parts 17 and 18 of the same shape, and these folding parts 17 and 18 are isosceles triangular shapes in which the bottom side is connected to the body part 11. Bottom folding (large) panels 19 and 20,
The bottom folding (large) panels 19 and 20 are connected to the oblique sides via diagonal ruled lines g and h, respectively, and vertical ruled lines c are provided on the sides of the bottom (semi) panels 14 and 15 or the bottom (all) panels 16, respectively. , D, e, f, a pair of bottom-folding (small) bottom panels 21 and 22 in a triangular shape.

Furthermore, in addition to the vertical ruled lines c, d, e and f, the rib portion 13 has a bottom folding (large) panel 19,
Vertical ruled lines i and j are engraved from the top of 20 toward the lower edge of the blank 10, respectively.

The procedure for producing the modified bottom paper cup A of the present invention will be described below.

First, the blank 10 is wound, the inner peripheral ruled line a and the outer peripheral ruled line b are matched at both ends, and the bottom (semi) panels 14 and 15 are partially overlapped with each other to form the bottom (all) panel 16. A cylindrical body in which both sides of the blank 10 are overlapped and heat-sealed so as to have the same size as that of the blank 10, and the upper edge of the body wall 1 is widened as shown in FIG. 2a is formed.

Since the packaging material for forming the blank 10 is a laminate mainly composed of paper even if it has a barrier property due to various layer constitutions described later, moisture and gas are stuck on the paper layer. There is a possibility that it will leak from the joint. Therefore, in the laminating part, the surface layer of the packaging material is removed (skived) at the inner side part to thin this part, and the thinned part is folded back (hemmed). It is preferable that the paper layer is not exposed on the inner side of the bonding portion by being bonded to the outer side portion. This end surface treatment structure is a known one called skive hemming treatment, which allows the paper cup to be completely sealed, and the thickness of the bonding portion is such that the side of the blank 10 is simply folded back. It is possible to avoid the thickness being three times as thick as that of the above, and it is also possible to use waste paper because the paper layer is not exposed.

Next, after forming the cylindrical body 2a having the widened upper edge in this manner, the lower opening is closed to form the flat rectangular bottom portion 2.

To this end, first, as shown in FIG. 3B, the lower part of the barrel wall 1 of the tubular body 2a is provided with vertical ruled lines c, d, e.
Bend at f to make the opening rectangular.

Next, as shown in FIG. 3C, the bottom folding (large) panels 19 and 20 facing each other are bent inward along the inner circumferential ruled line a while being folded inward along the diagonal ruled lines g and h, and at the same time, facing each other. The remaining bottom (full) panel 16 and bottom (semi) panels 14, 15 are folded into each bottom (small) panel 2
By folding inward with the inner circumferential ruled line a together with Nos. 1 and 22, the rib portions connected to the lower sides of the bottom folding (small) panels 21 and 22 are folded, and as shown in FIG. To form a rib overlapping portion R by horizontally heat-sealing so that the bottom (full) panel 16 or the bottom (semi) panel 14 is tilted to one side by an outer circumferential ruled line b as shown in FIG. , 15 to be folded flat to form a flat bottom closure 2 and a bottomed taper having a cylindrical body wall 1 with a widened upper edge as shown in FIG. The tubular body 2b is formed.

Finally, the upper edge of the body wall 1 of the bottomed tapered cylindrical body 2b having an open top is curled outward to form a top curl portion 3 and a book as shown in FIG. The modified bottom paper cup A of the invention can be completed.

Furthermore, the modified bottom paper cup A of the present invention is used as a highly sealed paper container filled with contents by sealing the top curl portion 3 with a sealing lid after filling the contents. be able to. In addition,
As the seal lid, a known lid material corresponding to the intended use can be used.

In the modified bottom paper cup A of this embodiment, the upper opening having the top curl portion 3 has a circular shape, but the opening has a rounded rectangular shape in accordance with the rectangular shape of the bottom portion 2 shown in FIG. The modified bottom paper cup B as shown in FIG.

Next, the constitution of the laminated body of the packaging material used for the modified bottom paper cup of the present invention is such that paper is the main strength material,
The innermost layer is basically a layer made of a thermoplastic resin. Further, the outermost layer is also preferably a layer made of a thermoplastic resin. Furthermore, it is preferable to provide a barrier layer.

As the paper which is the main strength material, various paper base materials having excellent mechanical, physical, chemical and other properties are used because they are the basic material constituting the deformed bottom paper cup. For example, it is possible to use paper base materials such as cup base paper, synthetic paper, imitation paper, thin paper, clay coat paper, kraft paper, and various paperboards and processed papers. Above all, it is preferable to use a cup base paper having good suitability for forming a paper cup. The basis weight of the paper base material is not particularly limited, but a range of 70 to 200 g / m ² can be used, but it is 15 due to the suitability for paper cup molding.
The range of 0 to 300 g / m ² is preferable.

The thermoplastic resin used for the innermost layer and the outermost layer has a function of protecting the contents, in particular, not leaking even when a liquid substance is put therein. Also, the heat seal is used to bond the body wall 1 and the bottom portion 2 to each other. It is necessary to have a function that enables adhesion for forming.

For example, low density polyethylene, medium density polyethylene, high density polyethylene, linear low density polyethylene, polypropylene, polyethylene terephthalate, ethylene-vinyl acetate copolymer, ionomer resin, ethylene-acrylic acid copolymer, ethylene- Ethyl acrylate copolymer, ethylene-methacrylic acid copolymer, ethylene-propylene copolymer, methylpentene polymer, polybutene polymer, acid-modified polyolefin resin, film or sheet of resin such as others, or various Waxes and the like can be used.

In particular, for applications requiring heat resistance such as for microwave ovens and retorts, a film having heat resistance,
For example, it is preferable to use a film of polypropylene, polyethylene terephthalate or the like.

The thickness of the resin film is 1
Range of 0 to 300 μm, preferably 20 to 100 μm
The range of is desirable.

Next, as the barrier layer, water vapor,
It is possible to use a material having a property of not permeating water, gas, etc., which may be a single base material or a composite base material in which two or more base materials are combined.

For example, aluminum foil having a light-shielding property and a barrier property, a resin film having a metal vapor deposition film such as aluminum, and a resin having a vapor deposition film of an inorganic oxide such as silicon oxide and aluminum oxide having a barrier property. Films or sheets of resins such as low density polyethylene, medium density polyethylene, high density polyethylene, linear low density polyethylene, polypropylene, ethylene-propylene copolymer, etc. having a barrier property against films, water vapor, water, etc., gas barriers It is possible to use a film of a resin such as polyvinylidene chloride, polyvinyl alcohol, a saponified product of an ethylene-vinyl acetate copolymer, or the like having properties. These materials can be used alone or in combination of two or more. The thickness of the above film is arbitrary, but is usually in the range of 5 to 300 μm, and further 10 to 1
The range of 00 μm is desirable. Further, in the above description, the aluminum foil having a thickness in the range of 5 to 30 μm and the vapor-deposited film of aluminum or an inorganic oxide having a thickness in the range of 100 to 2000 Å can be used. Examples of the resin film that supports the above vapor deposition film include polyester film, polyamide film, polyolefin film, polyvinyl chloride film, polycarbonate film, polyvinylidene chloride film, polyvinyl alcohol film, ethylene-acetic acid. A saponified vinyl copolymer film, etc. can be used.

In the present invention, in addition to the above-mentioned materials, other materials satisfying properties such as chemical resistance, solvent resistance, hygiene resistance, etc. can be optionally used. , Specifically, the resin films listed above,
Alternatively, a resin film other than that, a film such as cellophane, and the like can be arbitrarily selected and used according to the packaging purpose.

Next, in the present invention, the above materials are used to produce a laminate having a paper layer as a main component and an innermost layer and an outermost layer made of a thermoplastic resin, or a barrier layer. A method will be described. As such a method, a usual method of laminating a packaging material can be used.

For example, a wet lamination method, a dry lamination method, a solventless dry lamination method, an extrusion lamination method, a T-die coextrusion molding method, a coextrusion lamination method, and the like can be used. it can.

In the present invention, the film may be subjected to a pretreatment such as corona treatment or ozone treatment, if necessary, when the above-mentioned lamination is carried out. Anchor of urethane type), polyethyleneimine type, polybutadiene type, organic titanium type, etc.
A known anchor coating agent or adhesive, such as a coating agent, a polyurethane-based or polyacrylate-based adhesive for laminating, or the like can be used.

The modified bottom paper cup of the present invention can be widely used for beverages, like a general paper cup. Further, by heat-sealing the lid member, it can be used as a paper container that requires hermeticity, for example, a paper container for a retort.

[0037]

EXAMPLES Next, the present invention will be described more specifically with reference to Examples.

[Example 1] As a packaging material, a low-density polyethylene resin layer 20 μm / cup base paper 280 g from the surface
/ M ² / low-density polyethylene resin layer 40 μm of the material is used to first punch into a blank 10 as shown in FIG. 2, and then this blank 10 is wound around a mandrel, as shown in FIG. The cylindrical body 2a is formed into a rectangular shape, and the lower portion of the body wall 1 of the cylindrical body 2a is bent along each ruled line to form an opening having a rectangular shape as shown in FIG. Then,
As shown in FIG. 3-c, while the opposing bottom folding (large) panels 19 and 20 are folded inward along the diagonal ruled lines g and h, they are folded inward along the inner circumferential ruled line a, and at the same time, the remaining bottom (total) ) Panel 16 and bottom (semi) panels 14, 1
5 is folded inward along the bottom folding (small) panels 21 and 22 along the inner circumferential ruled line a to fold the rib portion connected to the lower side of the bottom folding (small) panels 21 and 22, and as shown in FIG. As shown in FIG. 3-e, the rib overlap portion R is horizontally heat-sealed so as to be overlapped in a V shape, and the bottom (all) panel is tilted to one side by the outer peripheral ruled line b as shown in FIG. 16 or bottom (half) panel 14, 1
5 and is folded flat to form a flat bottom closure 2 with a bottomed tapered wall having a cylindrical barrel wall 1 with a widened upper edge as shown in FIG. Cylindrical body 2b
Formed. Finally, the top edge of the body wall 1 was curled outward to form the top curl portion 3 to prepare the modified bottom paper cup A of the present invention having a circular opening as shown in FIG.

This modified bottom paper cup A was used as a paper cup for beverages, like a general paper cup.

Example 2 As a packaging material, a polypropylene resin layer 20 μm / cup base paper 280 g / m from the surface
² / Aluminum foil 7 μm / Polypropylene resin layer 40
Using a material having a composition of μm in the same manner as in Example 1,
A bottomed tapered cylindrical body 2b having a cylindrical body wall 1 having a flat bottom closed portion with a bottom portion 2 and a widened upper edge as shown in FIG. Finally, the top edge of the body wall 1 is curled outward to form the top curl portion 3 to prepare a modified bottom paper cup B of the present invention having a rounded rectangular opening as shown in FIG.

On the other hand, as the lid member, a material having a composition of polypropylene resin layer 20 μm / cup base paper 280 g / m ² / aluminum foil 7 μm / polypropylene resin layer 40 μm from the surface is used to open the opening of the modified bottom paper cup B of the present invention. It was punched into a shape to cover it.

The modified bottom paper cup B of the present invention was filled with retort soup as a content, and the lid material was heat-sealed to be used as a paper container for retort.

[0043]

The effects of the modified bottom paper cup of the present invention are as follows. (1) It can be molded from one blank. As a result, blanks having a small volume can be supplied, and the process of manufacturing the paper cup can be directly connected to the content filling line in the content filling manufacturer. (2) By using a rectangular flat-bottom type having a bottom portion and not a raised bottom type having a thread twisting portion, it is possible to obtain a paper cup having no leakage and high sealing performance. In other words, since there is no step of forming the thread twisting part and the bottom part is formed by heat-sealing the rib part of one blank, there are no wrinkles that cause leakage, and pinholes caused by hot air broke. Does not occur. As a result, it can be used as a paper container for a retort that requires high sealing performance. (3) A paper cup having good stacking suitability can be obtained. As a result, it is possible to save space in storage and transportation. (4) Unlike a paper cup having a general shape, since there is no recess in the corner of the inner surface of the bottom, it is easy to sterilize and can be used for aseptic packaging. Moreover, since it can be sterilized in the blank stage, it is easy to sterilize and is suitable for aseptic packaging.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of a modified bottom paper cup according to the present invention.

FIG. 2 is a development view showing a blank of a modified bottom paper cup according to the present invention.

FIG. 3 is a diagram showing a process of making an embodiment of a modified bottom paper cup according to the present invention.

FIG. 4 is a perspective view showing another embodiment of the modified bottom paper cup according to the present invention.

FIG. 5 is a perspective view showing a conventional paper cup.

[Explanation of symbols]

A deformed bottom paper cup B deformed bottom paper cup P Conventional paper cup 1 body wall 2 bottom 3 Top curl part 10 blank 11 torso 12 Bottom part 13 rib part 14 Bottom (semi) panel 15 Bottom (semi-) panel 16 bottom (all) panels 17 Bottom folding part 18 Bottom folding part 19 Bottom folding (large) panel 20 Bottom folding (large) panel 21 Bottom folding (small) panel 22 Bottom folding (small) panel 31 Body member 32 Bottom member 33 Bend 34 Threading section

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Claims (3)

[Claims] 1. A tubular shape formed from a single fan-shaped blank made of a laminate having paper as a base material, the blank being wound, and a lower opening having a rectangular shape and an upper opening widened. The body is formed, and the bottom folding panels facing each other at the lower part of the tubular body are folded inward with diagonal ruled lines, respectively, and are bent inward through the circumferential ruled lines, and at the same time, the remaining opposite bottom panels are folded inward to form the circumferential ruled lines. The bottom part of the bottom panel and the bottom part of the bottom panel are horizontally heat-sealed so as to overlap the bottom part of the bottom panel and the bottom part of the bottom panel so as to overlap with each other to form a rib overlap portion, and the rib overlap portion is tilted to one side to be flat. A modified bottom paper cup, which is folded and adhered to the bottom panel to form a flat rectangular bottom closure. 2. The deformed bottom paper cup according to claim 1, wherein an upper edge of the body wall is curled outward to form a top curl portion, and an opening of the upper portion is circular. 3. The deformed bottom paper cup according to claim 1, wherein an upper edge of the body wall is curled outward to form a top curl portion, and an opening of the upper portion is formed into a rectangular shape with rounded corners.