JP2004345652A - Volume-reducible insulating composite container - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a volume-reducible insulating composite container, which can be reduced in volume when scrapped after being used up. <P>SOLUTION: A paper cup, i.e., the volume-reducible insulating composite container, 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 bent part. 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 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 heat-insulating composite container comprising an outer package of a paper cup and an inner package of a plastic which can be separated at the time of disposal after use, and more particularly, by facilitating crushing after use. The present invention relates to a volume-reduced heat-insulating composite container capable of volume reduction.
[0002]
[Prior art]
Conventionally, as a heat-insulating composite container that can be used in a microwave oven, a practical form in which a double structure in which an inner package of a plastic molded cup is fitted into an inner package of an outer package of a paper cup and integrated is practically used. Has been Heating and cooking of the insulated composite container storing the beverages and prepared foods is directly performed using a microwave oven (for example, see Patent Document 1). As shown in FIG. 2, the paper cup P of the outer package body includes a body member 1 and a bottom member 2, and the body member 1 mainly forms the body portion 11, and the upper end is curled outward to top curl. The folded portion 13 is formed by folding the lower end inward. 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.
[0003]
[Patent Document 1]
Japanese Patent Application Laid-Open No. 10-338277
[Problems to be solved by the invention]
As described above, in the paper cup used for the outer package of the conventional heat-insulating composite container, the body member and the bottom member are strongly bonded by the bonding portion, and the top edge of the body portion is formed with the top curl portion, and the shape retention property is improved. It is a container with good crush resistance. On the other hand, the paper cup after being used cannot be easily crushed. Therefore, when disposing after using the insulated composite container, the paper cup of the outer package cannot be easily crushed, and the Is very bulky.
[0005]
SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems relating to the insulated composite container, and provides a volume-reduced insulated composite container that can be easily reduced in volume when used and then discarded. The purpose is.
[0006]
[Means for Solving the Problems]
As a result of studying to solve the above problems, the volume-reduced heat-insulating composite container of the present invention has a body member blank in a paper cup whose main material is paper and a body member and a bottom member are joined by a joint. Is wound into a cylindrical shape to form an inverted truncated cone-shaped body member, the outer peripheral edge of the bottom member blank is bent downward to form a bottom member having a bent portion, and the lower end portion of the body member is folded back. By sandwiching the bent portion of the bottom member between the portion and the body member, when the body member and the bottom member press from the outer surface side to the inner surface side of the central portion of the bottom portion of the bottom member, A volume-reduced heat-insulating composite container, wherein the bottom member is joined in a temporarily attached state having a joining strength detached from the body member.
[0007]
Thus, according to the present invention, by reducing the strength of the joining portion for joining the body member and the bottom member of the paper cup used for the outer package of the heat-insulating composite container to a temporary attachment state, after use, At the time of disposal, the body member and the bottom member can be easily disassembled, and the volume reduction can be easily performed by crushing the paper cup of the outer package which has been easily crushed by removing the bottom member together with the plastic cup of the inner package. The present invention can provide a heat-insulating composite container with reduced volume.
[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 an example of an embodiment of an insulated composite container according to the present invention, in which a left half and a right half are shown in a sectional view and a front view, respectively. The composite container A is composed of an inverted truncated cone-shaped paper cup 10 opened above the container of the outer package, and a plastic cup 30 opened above the inner package. The paper cup 10 of the outer wrapping body and the plastic cup 30 of the inner wrapping body have a double structure in which they are engaged with each other at the upper part of the body and integrated.
[0010]
As shown in FIG. 2, the paper cup 10 of the outer package body 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 and the top curl portion 12 is formed. 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 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.
[0011]
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 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.
[0012]
The bonding strength here is the maximum strength that applies pressure from the outer surface side of the bottom part 21 of the bottom member 2 and resists the bottom member 2 coming off the body member 1, and the pressing area is assumed to be pressed with a finger or the like. Then, the range is set to 50 to 500 mm ² . Specifically, using a cylindrical rod having a diameter of 20 mm (a pressing area of about 314 mm ² ), pressure is applied from the outer surface side of the bottom portion 21 of the bottom member 2 so that the bottom member 2 is detached from the trunk member 1. FIG. 3 is a diagram showing an example of a method for measuring the bonding strength. A ten-circle rod having a diameter of 20 mm (a pressing area of about 314 mm ² ) is attached to the bottom member 2 using Tensilon, a strength measuring device. The maximum strength against which the bottom member 2 resists when the bottom member 2 comes off the trunk member 1 is measured by pressing the bottom member 21 from the outer surface side.
[0013]
Next, the material used for the body member 1 and the bottom member 2 of the paper cup 10 of the outer package of the volume-reduced heat-insulating composite container A according to the present invention is that paper is the main strength material and the innermost layer has a thermoplastic resin. It is based on
[0014]
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.
[0015]
The thermoplastic resin used for the innermost layer must have the function of protecting the contents, bonding the body by heat sealing, and joining the body member 1 and the bottom member 2 in the temporarily attached state. . Polyethylene is generally and widely used, but in the case of polyethylene, when heated in a microwave oven, it is re-melted, and the joining strength at the joint between the body member 1 and the bottom member 2 is greatly enhanced. It becomes difficult to remove the bottom member 2 from the body member 1, which is not preferable. Therefore, a resin that has heat resistance and does not enhance the bonding strength when heated in a microwave oven is preferable. For example, 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.
[0016]
As a specific material configuration, for example, a paper layer / polypropylene resin layer, a polypropylene resin layer / paper layer / polypropylene resin layer, a paper layer / polyester resin layer, a polyester resin layer / paper layer / polyester resin layer, Paper layer / nylon resin layer, nylon resin layer / paper layer / nylon resin layer, and the like.
[0017]
On the other hand, the plastic cup 30 of the inner package is formed by molding a plastic sheet. The material of the plastic sheet is not particularly limited, and examples thereof include a polypropylene resin, a polyethylene resin, a polyethylene terephthalate resin, a polystyrene resin, a polyvinyl chloride resin, and a vinyl acetate copolymer. Also, a laminate of these resins, for example, a laminate composed of polypropylene resin / vinyl acetate copolymer / polypropylene resin can be used. Alternatively, a filler such as magnesium silicate can be mixed with these resins and used. The plastic cup 30 is formed into a cup shape including a body 31 and a bottom 32 by molding a plastic sheet made of these resins by vacuum molding or air pressure molding.
[0018]
The plastic cup 30 is suspended by the paper cup 10 as shown in FIG. Therefore, the shape of the plastic cup 30 is free as long as it is within the space 3 of the paper cup 10, and may be, for example, a hemispherical shape in which the bottom 32 is a curved line.
[0019]
Next, a method for producing the heat-insulated composite container with reduced volume of the present invention will be described.
[0020]
The volume-reduced paper cup of the present invention is formed by overlapping 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) for forming a body member 1 having an inverted truncated cone shape tapering downward as shown in FIG. 4A, and a bottom member 2 shown in FIG. (B) forming the bottom member 2 having the bent portion 22 in the periphery of the bottom surface 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.
[0021]
In the production of the paper cup, in the paper cup forming step of joining the body member 1 and the bottom member 2 to form the joint 3, the temperature, pressure, and time, which are the conditions of the thermocompression bonding, are set in the temporarily attached state of the joint 3, that is, The joint strength of the joint 3 is set 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.
[0022]
Although not shown, after filling the contents into the plastic cup 30, the film lid member may be heat-sealed to the flange portion 33, or an overcap may be applied so as to cover the entire opening. As described above, the paper cup 10 of the outer package is engaged with the plastic cup 30 of the inner package that has been filled and sealed with the lid. And then filling and lid sealing may be performed.
[0023]
This engagement can be achieved by simply dropping the plastic cup 30 of the inner package into the paper cup 10 of the outer package from above and pushing it down until the paper cup 10 engages with the plastic cup 30. The paper cup 10 of the outer package may be pushed into the plastic cup 30 of the body so as to cover it from below.
[0024]
In the heat insulating composite container A having the double structure combined in this manner, the paper cup 10 of the outer package is integrated with the plastic cup 30 of the inner package by the above-mentioned engagement, and the body 11 and the body 31 of both are combined. A space 3 is formed between the bottom portion 12 and the bottom portion 32, and the space 3 provides heat insulation to the volume-reduced heat-insulating composite container A.
[0025]
Actually, when the volume-reduced heat-insulating composite container A of the present invention is used and discarded after being used, the bottom member 2 can be easily removed from the trunk member 1 by pressing with a finger from the outer surface side of the bottom member 2, Then, the body member 1 of the paper cup 10 of the outer package with the bottom member 2 removed can be easily crushed together with the plastic cup 30 of the inner package, and the volume reduction of the heat-insulating composite container A can be easily performed. Can be. Further, at the time of disposal, after the paper cup of the outer package is separated from the plastic cup of the inner package in advance, the paper cup and the plastic cup can be respectively crushed to reduce the volume.
[0026]
【Example】
Next, the present invention will be described more specifically with reference to examples.
[0027]
〔Example〕
First, as an outer package, a paper cup having a height of 62 mm, an outer diameter of an opening of 88 mm, and an outer diameter of a lower end of a body portion of 64 mm was prepared. As the material of the body member, a material having a composition of 20 μm of polypropylene resin layer / 260 g / m ^{2 of} cup base paper / 40 μm of polypropylene resin layer from the surface was used, and as the material of the bottom member, 15 μm of polypropylene resin layer / 260 g / m of cup base paper from the surface. A material having a composition of ² / polypropylene resin 40 μm was used.
[0028]
First, a blank of a trunk member as shown in FIG. 4-a 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. 4-b. 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 preparing a paper cup of the outer package.
[0029]
On the other hand, a plastic cup having a height of 45 mm, an outer diameter of the opening of 95 mm, and an inner capacity of 180 cc was placed on a laminate (thickness: 1.2 mm, thickness: 0.55 mm of polypropylene / 0.1 mm of vinyl acetate copolymer / 0.55 mm of polypropylene). ) And formed by a compressed air / vacuum forming method.
[0030]
Then, the plastic cup of the inner package is simply dropped from above onto the paper cup of the outer package, and the plastic cup is pushed in until it engages with the paper cup to engage, and the outer package and the inner package are integrated. A heat-insulating composite container A having a space between the body portions and a bottom portion between the two body portions was prepared.
[0031]
(Comparative example)
As the material of the body member and the material of the bottom member of the paper cup of the outer package, the same material as in the above embodiment is used, and the manufacturing process is also performed in the same process as in the example, and the body member and the bottom member are formed. The conditions of the thermocompression bonding at the time of forming the joint portion by thermocompression bonding are different from the conditions of the above embodiment, and the temperature of hot air, which is the production condition of the conventional paper cup, is 450 ° C. 800 kg / cm ² and the pressurization time were 0.3 seconds. Then, the upper end of the body member was curled outward to form a top curled portion, and a paper cup of an outer package having the same shape as that of the example was prepared.
[0032]
On the other hand, the plastic cup of the inner package is also manufactured in the same shape using the same material as that of the embodiment, and the plastic cup of the inner package is simply dropped from above onto the paper cup of the outer package, A heat-insulating composite container having a space between a body part and a body part, and a bottom part between the body parts, in which a plastic cup is pushed into and engaged with a paper cup until the plastic cup is engaged with the paper cup, and the outer package and the inner package are integrated. Was prepared.
[0033]
As a result of measuring the joining strength between the body member and the bottom member of the paper cup of the outer wrapping body 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 exhibited a bottom portion with a pressure of 20 kgf. The whole paper cup buckled without the material coming off the trunk member. On the other hand, in the paper cup of the example, the bottom member was detached from the body member by a pressure of 1.5 kgf.
[0034]
Actually, it was cooked in a microwave oven and immediately taken out with bare hands. As a result, in the case of this example, it was not hot even if it was held by hand, it could be easily taken out of the microwave oven, and the table could have a container. After use, in the volume-reduced heat-insulating composite container of the embodiment, the bottom member can be easily removed from the body member by pressing the bottom portion with a finger, and the body member of the paper cup of the outer package body is removed. While it could be easily crushed together with the plastic cup of the inner package, it was difficult to remove the bottom member from the body member with the force of a finger in the heat-insulated composite container using the conventional paper cup of the comparative example, and the volume was reduced. It was not easy to crush the entire heat-insulated composite container, and it was difficult to reduce the volume.
[0035]
【The invention's effect】
As described above, the volume-reduced heat-insulating composite container of the present invention reduces the strength of the joint that joins the trunk member and the bottom member to a temporary attachment state, so that when used and discarded after use, the outer packaging The body paper cup can be easily disassembled into a body member and a bottom member. This has the effect that the volume of the entire composite container can be easily reduced.
[Brief description of the drawings]
FIG. 1 is a partially cutaway front view showing one embodiment of a volume-reduced heat-insulating composite container of the present invention.
FIG. 2 is a partially cutaway front view showing a paper cup of an outer package of one embodiment of the reduced volume heat insulating composite container of the present invention.
FIG. 3 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 the reduced volume heat insulating composite container of the present invention.
FIG. 4 is a schematic explanatory view for explaining a process of manufacturing the volume-reduced heat-insulating composite container of the present invention.
FIG. 5 is a schematic explanatory view for explaining a method for reducing the volume of the heat-insulating composite container of the present invention after actually using it.
[Explanation of symbols]
A Insulated composite container with reduced volume 1 Body 1A Blank (body)
Reference Signs List 10 Paper cup 11 Body 12 Top curl 13 Folded part 2 Bottom member 2A Blank (bottom member)
21 bottom portion 22 bent portion 3 joint portion 30 plastic cup 31 body portion 32 bottom portion P conventional paper cup

Claims (1)

It consists of an outer package made of paper with an open top, and an inner package made of plastic with an open top, and is engaged between the upper body portion of the outer package and the upper body portion of the inner package. Wherein the outer package is a paper cup having paper as a main material and a body member and a bottom member joined by a joining portion, and the body member blank is wound into a cylindrical shape and then inverted. The trunk member in the shape of a truncated cone is formed, the outer peripheral edge of the bottom member blank is bent downward to form the bottom member having a bent portion, and a folded portion formed by folding a lower end of the trunk member and the trunk member. By sandwiching the bent portion of the bottom member with the body member and the bottom member, when the body member and the bottom member press from the outer surface side to the inner surface side of the central portion of the bottom portion of the bottom member, the bottom member is Joined in a temporary attachment state with a joining strength that deviates from Volume reduction heat insulating composite container according to claim Rukoto.

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