JP2004345651A - Volume-reducible paper cup - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a volume-reducible paper cup, which can be manufactured through a conventional paper cup manufacturing process and reduced in volume when scrapped after being used up. <P>SOLUTION: The volume-reducible paper cup is mainly made of paper and has a trunk member and a bottom member, which are joined at a joint. In manufacturing the paper cup, a trunk member blank is rolled cylindrically to form the trunk member of an inverse truncated cone, while the outer circumferential edge of a bottom member blank is folded downward to form the bottom member having a bottom surface with a bent part on the outer circumference thereof. The bent part of the bottom member is sandwiched between a folded part formed by folding back the lower end of the trunk member and the trunk of the trunk member. In this state, the trunk member and the bottom member are joined temporarily at the joining strength that allows the bottom member to separate from the trunk member when the center of the bottom outer surface of the bottom member is pushed inward. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a volume-reduced paper cup that can be reduced in volume at the time of disposal after use, and more particularly, after use, can be disassembled into a trunk member and a bottom member, and the volume can be reduced by crushing the trunk member. The present invention relates to a volume-reduced paper cup.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, paper cups have been widely used for hot beverages and instant foods in vending machines and the like. Although not common, they are also used as containers for confectionery such as candy and gift products. As shown in FIG. 1, a general paper cup P includes a body member 1 and a bottom member 2. The body member 1 mainly forms a body portion 11, and the upper end is curled outward to form a top curl portion 12. The lower end is folded inward to form a folded portion 13. On the other hand, the bottom member 2 mainly forms the bottom surface portion 21, and the outer peripheral edge portion is bent downward at a substantially right angle to form a bent portion 22. The joining of the trunk member 1 and the bottom member 2 is performed by thermocompression bonding with the bent portion 22 of the bottom member 2 sandwiched between the folded portion 13 of the trunk member 1 and the lower end of the trunk portion 11. A portion where the bent portion 22 of the bottom member 2 is sandwiched and joined is referred to as a joint portion 3 and the bottom portion 21 is raised to the bottom. Further, as a paper cup that can be reduced in volume after use, a half-cut line extending from the outer surface side to the inner surface side to reach a substantially intermediate portion of the material of the bottom member 2 is engraved on the outer peripheral edge of the bottom portion 21. (For example, see Patent Document 1).
[0003]
[Patent Document 1]
JP-A-2002-68163
[Problems to be solved by the invention]
As described above, in the conventional paper cup, the trunk member and the bottom member are strongly joined to each other by the joint portion, and the top edge of the trunk portion is formed with the top curl portion, and has good shape retention and excellent crush resistance. Container. On the other hand, there is a problem that the used paper cup cannot be easily crushed and the volume after disposal becomes very bulky. Further, a paper cup having a form in which a half-cut line extending from the outer surface side to the inner surface side to a substantially intermediate portion of the material of the bottom member 2 is engraved on the outer peripheral edge of the bottom portion 21 is actually a half-cut line. However, there is a problem that the crushing force alone is insufficient to weaken the crushing force, and a step of engraving a half-cut line is required.
[0005]
The present invention has been made in view of the above-mentioned problems relating to paper cups, and can be manufactured in a conventional paper cup manufacturing process, and can be easily reduced in volume when used and discarded. It is an object of the present invention to provide a reduced volume paper cup.
[0006]
[Means for Solving the Problems]
As a result of studying to solve the above problems, the volume-reduced paper cup of the present invention is a paper cup in which paper is used as a main material, and a body member and a bottom member are joined by a joining portion. Forming the bottom member having an inverted truncated cone shape, bending the outer peripheral edge of the bottom member blank downward to form the bottom member having a bent portion on the outer periphery of the bottom portion, and forming a lower end of the trunk member. By sandwiching the bent portion of the bottom member between the folded portion where the portion is folded and the trunk of the trunk member, the trunk member and the bottom member are positioned from the outer surface side of the center of the bottom surface of the bottom member. A volume-reduced paper cup, wherein the bottom member is joined in a temporarily attached state having a joining strength that is detached from the body member when pressed toward an inner surface side.
[0007]
As described above, according to the present invention, in the conventional paper cup manufacturing process, by reducing the strength of the joining portion that joins the trunk member and the bottom member to the temporary attachment state, after use, when discarding An object of the present invention is to provide a volume-reduced paper cup in which a body member and a bottom member can be easily disassembled, and the volume can be easily reduced by crushing the body member which has been easily crushed.
[0008]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described in more detail with reference to the drawings. The same parts in different drawings are denoted by the same reference numerals.
[0009]
FIG. 1 is a partially cutaway front view showing a left half and a right half of an embodiment of a volume-reduced paper cup according to the present invention in a sectional view and a front view, respectively. The volume-reduced paper cup A includes a body member 1 and a bottom member 2. The body member 1 mainly forms a body portion 11, the upper end is curled outward to form a top curled portion 12, and the lower end is folded inward. The folded portion 13 is provided. On the other hand, the bottom member 2 mainly forms the bottom surface portion 21, and the outer peripheral edge portion is bent downward at a substantially right angle to form a bent portion 22. The torso member 1 and the bottom member 2 are joined by heating and pressing the bent portion 22 of the bottom member 2 between the folded portion 13 of the torso member 1 and the lower end portion of the torso member 11, and in a temporarily attached state where the joining strength is weak. Is formed.
[0010]
That is, it is characterized in that the bonding strength of the bonding portion 3 between the body member 1 and the bottom member 2 is set in the range of 0.5 to 5.0 kgf by performing the heat compression bonding under predetermined conditions. If the joining strength is less than 0.5 kgf, there is a risk that it will come off during the paper cup forming step or the filling step of the contents. If the joining strength exceeds 5.0 kgf, the bottom member 2 is removed from the body member 1. Difficult to remove and separate.
[0011]
The bonding strength here is the maximum strength that applies pressure from the outer surface side to the inner surface side of the bottom portion 21 of the bottom member 2 and resists the bottom member 2 from coming off the trunk member 1. Assuming the above, the range is 50 to 500 mm ² . Specifically, a strength is applied to the bottom member 2 from the outer surface side to the inner surface side by using a cylindrical rod T having a diameter of 20 mm (a pressing area of about 314 mm ² ), so that the bottom member 2 comes off the trunk member 1. And FIG. 2 is a diagram showing an example of a method for measuring the bonding strength, in which a 20 mm-diameter circular injection rod T (pressing area of about 314 mm ² ) is attached to the bottom surface of the bottom member 2 using Tensilon, a strength measuring machine. The maximum strength against which the bottom member 2 resists when the bottom member 2 separates from the body member 1 is measured by pressing the portion 21 from the outer surface side to the inner surface side.
[0012]
Next, the material used for the body member 1 and the bottom member 2 of the volume-reduced paper cup A according to the present invention is based on paper as a main strength material and having a thermoplastic resin in the innermost layer.
[0013]
As the paper as the main strength material, it is preferable to use cup base paper having good suitability for paper cup molding. The basis weight is not particularly limited, but is more preferably in the range of 150 to 500 g / m ² in view of suitability for paper cup molding.
[0014]
The thermoplastic resin used for the innermost layer has a function of protecting the contents, bonding the body member 1 into an inverted truncated cone shape by heat sealing, and bonding the body member 1 and the bottom member 2. There is a need. Specifically, polyethylene, polypropylene, polyester, nylon and the like can be mentioned. The thickness is preferably in the range of 15 to 60 μm. These thermoplastic resins are formed in the innermost layer by extrusion or lamination.
[0015]
For example, specific material configurations include a paper layer / polyethylene resin layer, a polyethylene resin layer / paper layer / polyethylene resin layer, a foamed polyethylene resin layer / paper layer / polyethylene resin layer, and a paper layer / polypropylene resin layer from the surface side. , Polypropylene resin layer / paper layer / polypropylene resin layer, paper layer / polyester resin layer, polyester resin layer / paper layer / polyester resin layer, paper layer / nylon resin layer, nylon resin layer / paper layer / nylon resin layer, and the like. Can be
[0016]
Next, a method for producing the reduced volume paper cup of the present invention will be described.
[0017]
The volume-reduced paper cup of the present invention overlaps one edge of the blank 1A of the fan-shaped body member 1 with the other edge as shown in FIG. A body member forming step (a) of forming a body member 1 having an inverted truncated cone shape tapering downward as shown in FIG. 3A, a bottom member 2 as shown in FIG. (B) forming a bottom member 2 having a bent portion 22 in the periphery of the bottom portion 21 by squeezing the blank 2B to raise the outer peripheral edge downward, as shown in FIG. The inner surface of the bent portion 22 of the bottom member 2 is joined to the lower inner surface of the body member 1, and the lower edge of the body member 1 is turned inward so as to cover the bent portion 22 as shown in FIG. It is bent to form a folded portion 13, and the bent portion 22 of the bottom member 2 is sandwiched therebetween and joined to the outer surface thereof to form the joined portion 3. A paper cup forming step (c), and finally a top curl forming step (d) in which the upper edge of the body member 1 is wound outward and the top curl 12 is formed on the opening edge. Have been.
[0018]
In the volume-reduced paper cup of the present invention, in the paper cup forming step of joining the body member 1 and the bottom member 2 to form the joint portion 3, the temperature, pressure, and time, which are the conditions of the thermocompression bonding, are temporarily determined. The attachment state, that is, the joining strength of the joining portion 3 is set to be in the range of 0.5 to 5.0 kgf. Since these conditions are different depending on the materials used for the body member 1 and the bottom member 2, they are appropriately set according to the respective materials.
[0019]
Actually, when the volume-reduced paper cup A of the present invention is discarded after use, as shown in FIG. 4A, the paper cup A is pressed by a finger from the outer surface side of the bottom surface portion 21 of the bottom member 2 as shown in FIG. As shown in FIG. 4B, the bottom member 2 can be easily removed from the body member 1, and as shown in FIG. 4C, the body member 1 from which the bottom member 2 has been removed can be easily crushed. Volume reduction can be easily performed. When the bottom member 2 is detached from the body member 1, even if the body member 1 and the bottom member 2 are partially separated from each other without being completely separated from each other, no problem occurs when the body member 1 is crushed.
[0020]
【Example】
Next, the present invention will be described more specifically with reference to examples.
[0021]
〔Example〕
As the material of the body member, a low-density polyethylene resin layer of 20 μm / cup base paper 260 g / m ² / low-density polyethylene resin layer 40 μm was used from the surface, and as the material of the bottom member, a low-density polyethylene resin layer of 15 μm from the surface. / Cup base paper 260 g / m ² / low-density polyethylene resin 40 μm. First, a blank of a trunk member as shown in FIG. 3A was punched out, and the blank of the trunk member was wound around a mandrel to form a tubular trunk member as shown in FIG. Next, a blank of the bottom member was fitted from below the trunk member, the adhesive portion was heated with hot air, and a bent portion of the bottom member was sandwiched between a folded portion in which the lower end of the trunk member was folded inward and a lower end portion of the trunk portion. Heat bonding was performed to form a bonded portion that was bonded in a temporarily attached state. The heating and pressing conditions at this time were a hot air temperature of 250 ° C., a pressure of 800 kg / cm ² , and a pressure time of 0.3 seconds. Further, the upper end of the body member was curled outward to form a top curled portion, thereby producing a volume-reduced paper cup of the present invention.
[0022]
(Comparative example)
As the material of the body member and the material of the bottom member, the same material as in the above embodiment was used, and the manufacturing process was also made in the same process as in the embodiment, and the body member and the bottom member were joined by heating and pressing. Unlike the conditions in the above-described embodiment, the conditions of the heat-press bonding when forming the joints by heating are as follows: hot air temperature of 450 ° C. and pressurization of 800 kg / cm ² , which are the conventional paper cup manufacturing conditions. The pressure time was 0.3 seconds. Then, the upper end of the body member was curled outward to form a top curled portion, thereby producing a conventional paper cup.
[0023]
As a result of measuring the joint strength between the body member and the bottom member of the volume-reduced paper cup of this embodiment and the conventional paper cup of the comparative example by the above-described measuring method, the conventional paper cup of the comparative example showed that the bottom member was pressed by 20 kgf. However, the entire paper cup buckled without coming off the trunk member. On the other hand, in the volume-reduced paper cup of the example, the bottom member was detached from the body member by a pressure of 1.5 kgf. In fact, in the volume-reduced paper cup of the embodiment, the bottom member could be easily removed from the body member by pushing with a finger, whereas in the conventional paper cup of the comparative example, the bottom member was pressed by the finger. It was difficult to remove the paper cup from the body member, and the entire paper cup was crushed, making it difficult to reduce the volume.
[0024]
【The invention's effect】
As described above, the volume-reduced paper cup of the present invention is configured such that the strength of the joining portion that joins the trunk member and the bottom member is weakened to be in a temporarily attached state. This has the effect that the bottom member can be disassembled and separated, the bottom member can be removed, and the body member that has been easily crushed can be crushed, and the volume can be easily reduced.
[Brief description of the drawings]
FIG. 1 is a partially cutaway front view showing one embodiment of a reduced volume paper cup of the present invention.
FIG. 2 is a schematic view showing an example of a method for measuring a joining strength of a joining portion between a body member and a bottom member of a volume-reduced paper cup according to the present invention.
FIG. 3 is a schematic explanatory view illustrating a process of manufacturing the volume-reduced paper cup of the present invention.
FIG. 4 is a schematic explanatory view for explaining a method for reducing the volume of a volume-reduced paper cup of the present invention after actually using the cup.
[Explanation of symbols]
A Volume-reduced paper cup P Conventional paper cup 1 Body member 1A Blank (body member)
DESCRIPTION OF SYMBOLS 11 Body 12 Top curl part 13 Folding part 2 Bottom member 2A Blank (bottom member)
21 Bottom part 22 Bending part 3 Joint T cylindrical rod

Claims (1)

In a paper cup having paper as a main material and a body member and a bottom member joined at a joining portion, the body member blank is wound into a tubular shape to form the inverted truncated cone-shaped body member, and the outside of the bottom member blank is formed. The peripheral portion is bent downward to form the bottom member having a bent portion on the outer periphery of the bottom portion, and the bent portion of the bottom member is formed by a folded portion obtained by folding a lower end portion of the body member and a body portion of the body member. When the body member and the bottom member are pressed from the outer surface side to the inner surface side of the center of the bottom portion of the bottom member from the outer surface side to the inner surface side, the temporary member has a bonding strength in which the bottom member comes off the body member. A volume-reduced paper cup which is joined in a state.

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