JP2012091808A - Paper container in shape of bowl - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a paper container in the shape of a bowl which includes a body member and a bottom panel member.SOLUTION: In the paper container in the shape of a bowl includes a body member and a bottom member. The ratio between the container opening inside diameter and the container depth is within the range of 1.5:1-2.5:1 and the taper of the side wall of the body member is within the range of 3°-25°, a foam insulation layer is formed on the external wall face of the bottom panel member. When a user touches the external wall face of the bottom panel member to hold the container with his/her fingers except his/her thumb, the user does not feel the heat of the content of the container and holds the container safely because of the insulation layer formed.

Description

  The present invention relates to a paper bowl type container. More specifically, the present invention relates to a paper bowl type heat insulating container made up of a body member and a bottom plate member.

  Noodles such as buckwheat, rice bran and ramen have been developed as instant foods and are widely available on the market. These noodles are sold together with powdered soup and ingredients in a bowl-type disposable container. Conventional bowl-type disposable containers are made of plastic materials such as polystyrene foam and polystyrene paper. Styrofoam and polystyrene paper containers are most commonly used as containers for instant noodles because they are highly heat-insulating and can be molded into various shapes and are relatively inexpensive.

  However, it is reported that such expanded polystyrene and polystyrene paper not only consume a large amount of petroleum resources, but also the plasticizer in the expanded polystyrene and polystyrene paper can be eluted by hot water and have an adverse effect as an environmental hormone. ing. For this reason, paper containers are being developed as an alternative to expanded polystyrene and polystyrene paper containers, and some of them are put into practical use. The substitute paper container has a structure in which the body member and the bottom plate member are wound and integrated. Therefore, such a substitute paper container is closer to a cup shape than a “donburi” shape, and is completely different from conventional foamed polystyrene or polystyrene paper containers.

  Patent Documents 1 to 3 describe a one-piece type container in which the body and the bottom are continuous while being made of paper. However, the paper container described in Patent Document 1 is a paper plate, and the container described in Patent Document 2 is a so-called “tray”, not a “donburi” shape. Both the paper plate described in Patent Document 1 and the tray described in Patent Document 2 are manufactured by press-molding paperboard. If the depth of press forming the paperboard is shallow, it can be formed into a dish or tray.However, if the container is relatively deep, the paper is not stretchable, so there are wrinkles on the body wall and flange surface during drawing. Because of this, deep drawing is difficult to mold, and when trying to force draw, the paperboard breaks and cannot be formed into a container. In conventional press molding, only a container having a ratio of container aperture: height (depth) of about 3: 1 at the maximum can be molded. A container having a large opening diameter with respect to the height is used for noodles with a small amount of liquid juice such as champon, but is not suitable for a container for noodles with a large amount of liquid juice such as ramen, buckwheat noodles and strawberries. For example, the tableware used for champons has a container caliber: height of 23.5 cm: 7 cm (= 3.36: 1) or 19 cm: 5 cm (= 3.8: 1). The bowl was shaped like a bowl, and it was hard to say that it was a bowl. Patent Document 3 describes a bowl-shaped paper container having a ratio of a container opening inner diameter to a container depth of 1.5: 1 to 2.5: 1. This container is formed by deep drawing from a single sheet of paperboard. It is formed by. In the invention described in Patent Document 3, the base paper is scored, a blank is punched out from the scored base paper, and the blank is pressed and deep-drawn into a bowl-shaped container to form a bowl-shaped paper container Manufacturing. Although this scoring process avoids a situation where the paperboard is torn during deep drawing, it is inevitable that wrinkles are generated on the container body wall and the flange surface. Improvements have been strongly sought for the wrinkles on the container body wall and the flange surface, which not only impairs the aesthetics of the container but may cause discomfort to the user.

Japanese Patent Publication No. 5-3976 Japanese Patent No. 3411951 JP 2006-341911 A

  SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a paper bowl type heat insulating container made of a body member and a bottom plate member.

  The problem is composed of a body member and a bottom plate member, the ratio of the container opening inner diameter to the container depth is in the range of 1.5: 1 to 2.5: 1, and the taper of the side wall of the body member is 3 ° to 3 °. This is solved by a bowl-shaped paper container having a foam insulation layer formed on the outer wall surface of the bottom plate member.

  Since the container of the present invention is manufactured not by deep drawing but by a technique in which the body member and the bottom plate member are integrated, no unpleasant wrinkles occur on the container body wall portion or the like. Moreover, when the user grips the container, even if a finger other than the thumb touches the outer wall surface of the bottom plate member, the foam insulation layer is formed so that the container can be safely held without feeling the heat of the container contents. It can be gripped.

It is outline | summary sectional drawing of an example of the bowl type paper container of this invention. It is an outline sectional view of another example of the bowl type paper container of the present invention. It is an outline sectional view of other examples of the bowl type paper container of the present invention.

  Hereinafter, a preferred embodiment of the bowl type paper container of the present invention will be described in detail with reference to the drawings. FIG. 1 is a schematic sectional view of an example of a bowl type paper container of the present invention. The bowl-shaped paper container 1 of the present invention basically comprises a body member 3 and a bottom plate member 5. A lip 7 is formed at the upper end of the body member 3. The shape of the lip 7 is not limited to the illustrated folding structure, and a curling shape can also be employed. In FIG. 1, the size of each constituent member constituting the container is exaggerated for convenience of explanation.

  In the bowl-shaped paper container 1 of the present invention, the depth (H) from the upper end of the lip 7 to the inner wall surface of the bottom plate member 5 is smaller than the opening inner diameter (W) of the lip 7. Generally, in order to call it a bowl type, it is preferable that the ratio of the inner diameter of the opening (W) to the depth of the container (H) is in the range of 1.5: 1 to 2.5: 1. When W / H is less than 1.5, it becomes close to a cup-type container having a deep depth relative to the inner diameter, and cannot be said to be a bowl type. On the other hand, when W / H is more than 2.5, the depth is shallow with respect to the inner diameter, the shape is close to a “bowl”, and it is difficult to say that it is a bowl type container. In general, the bowl-shaped paper container of the present invention preferably has a W in the range of 11 cm to 20 cm and a H in the range of 6 cm to 10 cm. If W is less than 11 cm, it will be closer to a “cup” rather than “donburi”, and if W is greater than 20 cm, it will be closer to a “bowl”. In the present invention, a bowl-shaped paper container having W of 144 mm and H of 75 mm (W / H = 1.92) is preferable. However, if a larger or smaller volume is required depending on the application of the bowl-shaped paper container 1, other opening diameters and depths can naturally be selected.

  In the bowl-shaped paper container 1 of the present invention, the taper (θ) of the side wall of the body member 3 is an important factor in addition to the ratio of the above-mentioned opening inner diameter (W) to the container depth (H). In the bowl type paper container 1 of the present invention, the taper (θ) of the side wall of the body member 3 is preferably in the range of 3 ° to 25 °. If the taper (θ) of the side wall of the body member 3 is less than 3 °, it becomes close to a cylindrical shape, which is not much different from a commercially available cup ramen container. On the other hand, when the taper (θ) of the side wall of the body member 3 exceeds 25 °, it becomes a shape close to a cup or a tray, with a thumb attached to the edge of the container and another finger attached to the outer wall surface of the bottom plate. How to hold becomes difficult. The taper (θ) of the side wall of the body member 3 is particularly preferably in the range of 9 ° to 20 °.

  The body member 3 in the bowl-shaped paper container 1 of the present invention is formed from a base paper in which a film 11 is laminated on the inner wall surface side of a paper substrate 9. The laminate film 11 is an essential requirement for ensuring liquid penetration resistance. The laminate film 11 is preferably a thermoplastic synthetic resin film such as polyethylene, polypropylene, polyethylene terephthalate, or polybutylene terephthalate. Other thermoplastic synthetic resin films can also be used. Polyethylene terephthalate (PET), which has high heat resistance and little food odor transfer, is preferred. A metal thin film (for example, aluminum foil) other than the thermoplastic synthetic resin film can also be used. Therefore, the term “laminate film 11” in the present invention is used to include both a thermoplastic synthetic resin film and a metal thin film. The laminate film 11 can be either a single layer or a multilayer. In the case of multiple layers, the same or different films can be used. The thickness of the laminate film 11 to be used is in the range of several μm to several tens of μm. For example, a thickness of 15 μm to 90 μm is preferable. When the thickness of the laminate film is too thin, the liquid penetration resistance is lowered. On the other hand, if the thickness of the laminate film is too thick, the base paper becomes hard and the molding workability may be impaired. Although not shown, a laminate film can also be present on the outer wall surface side of the body member. This outer laminate film has effects such as improving the printability of the outer wall surface of the container body member and improving the aesthetics and waterproofness of the container. The outer laminate film is preferably polyethylene or polypropylene. Various information such as product names, eating methods, manufacturers, sellers, content composition tables, etc. can be printed on the outer wall surface of the container, but the information can be printed on the outer wall surface of the container body member, the outer wall surface of the bottom plate member, And / or it can apply to arbitrary places, such as a container bottom board member inner wall surface.

  The bottom plate member 5 in the bowl-shaped paper container 1 of the present invention is formed from a base paper in which a film 11 is laminated on the inner wall surface side of a paper substrate 9. The laminate film 11 is an essential requirement for ensuring liquid penetration resistance. The laminate film 11 is preferably a thermoplastic synthetic resin film such as polyethylene, polypropylene, polyethylene terephthalate, or polybutylene terephthalate. Other thermoplastic synthetic resin films can also be used. The laminate film 11 is preferably polyethylene terephthalate (PET), which has high heat resistance and little food odor transfer. A metal thin film (for example, aluminum foil) other than the thermoplastic synthetic resin film can also be used. The thickness of the laminate film to be used is in the range of several μm to several tens of μm. For example, a thickness of 15 μm to 90 μm is preferable. When the thickness of the laminate film is too thin, the liquid penetration resistance is lowered. On the other hand, if the thickness of the laminate film is too thick, the base paper becomes hard and the molding workability may be impaired.

  Unlike the body member 3, the bottom plate member 5 has a foam heat insulating layer 13 on the outer wall surface side of the paper substrate 9. The foam heat insulating layer 13 is formed by evaporating inherent moisture contained in the paper base material 9 from a low melting point thermoplastic synthetic resin film (for example, a low melting point low density polyethylene film) 15 laminated on the outer wall surface of the paper base material 9. It is formed by foaming. When a high melting point film is used for the laminate film 11 and a low melting point film is used for the laminate film 15, when the container 1 is heated, the laminate film 15 is foamed by the moisture contained in the paper base material 9 and has a thickness. It is possible to form the foamed heat insulating layer 13 having increased to several hundred μm to several mm. For example, the foam heat insulation layer 13 having a thickness of 100 μm to 1.5 mm is preferable. The film thickness of the low melting point laminate film 15 itself is in the range of 15 μm to 90 μm. A specific method for forming such a low-melting point thermoplastic synthetic resin film with moisture in the paper to form a heat insulating layer is described in detail in Japanese Patent No. 3014629 held by the present applicant.

  When holding the bowl-shaped paper container 1 of the present invention with one hand, generally, the thumb is attached so as to be in contact with the upper end surface of the lip 7, and the remaining several fingers are attached to the outer wall surface of the bottom plate member 5 ( That is, it is attached so as to be in contact with the foam heat insulating layer 13). Due to the presence of the foam heat insulating layer 13, the finger attached so as to be in contact with the foam heat insulating layer 13 can grip the container 1 very stably without feeling the hot air of the container contents at a high temperature. On the other hand, when the foam heat insulating layer 13 is not disposed, the lip 7 is away from the high temperature container contents, so that the thumb does not feel much heat of the contents, but the outer wall surface of the bottom plate member 5 The remaining fingers attached so as to be in contact with the heat transfer heat directly from the contents of the container, so the fingers cannot be attached so as to be in contact with the outer wall surface of the bottom plate member 5. You will have to have the hill part 17. However, it is extremely unstable to hold the container 1 with the lip 7 and the hill part 17, and the higher the container contents, the more dangerous. Therefore, since the foam heat insulating layer 13 is formed on the outer wall surface side of the bottom plate member 5 in the bowl-shaped paper container 1 of the present invention, even if the container is filled with high-temperature liquids, the contents feel almost hot. Therefore, it can be held very stably with the thumb and other fingers.

  A cup-shaped paper container (that is, a container having a container depth H larger than the container opening diameter W) in which a foam heat insulating layer is formed on the outer wall surface of the trunk member is described in Japanese Patent No. 3014629 held by the present applicant. ing. However, in the case of the bowl-shaped paper container 1, the finger cannot be gripped around the body member. In order to solve this problem, the provision of the foam heat insulating layer 13 on the outer wall surface of the bottom plate member cannot be conceived from Japanese Patent No. 3014629.

  The bowl type paper container 1 of the present invention can be assembled by a conventional cup manufacturing apparatus. First, the container body member base paper is fed out from the roll paper, and necessary printing is performed at a predetermined location. The positioning of the printed part can be performed by conventional means or procedures. The roll paper is subjected to film lamination as described above, and a container body member blank is punched out. Similarly, the container bottom plate member base paper is fed out from the roll paper, and necessary printing is performed at a predetermined place as desired. The roll paper is subjected to film lamination as described above, and a container bottom plate member blank is punched out. These blanks are used to assemble the container with a conventional cup molding machine. During assembly, the bottom plate member blank is assembled into a container so that the high melting point film laminate surface faces the inside of the container. At this time, the mouth edge portion 7 is also formed at the upper end of the container body member. Heat treatment is performed after the assembly of the container. Thereby, the bowl type paper container 1 which has the foam heat insulation layer 13 in the outer wall surface side of the baseplate member 5 as shown in FIG. 1 is obtained.

Paper substrate 9 which is used to produce the bowl paper-made container 1 of the present invention preferably has a basis weight in the range of ^{100g / m 2 ~400g / m 2} . Moreover, it is preferable that this paper base material 9 has a moisture content in the range of about 3 to 10%. When the moisture content of the paper base material 9 is less than 3%, the low melting point film laminated on the outer wall surface of the bottom plate member 5 cannot be sufficiently foamed. On the other hand, if the water content of the paper base material 9 exceeds 10%, the effect of foaming the film is saturated, and conversely the container strength decreases, which is not preferable.

  The heating temperature and heating time for producing the bowl-shaped paper container 1 of the present invention vary depending on the moisture content of the base paper used and the melting point of the thermoplastic synthetic resin film laminated to the outer wall surface of the bottom plate member. Specifically, the heating temperature is about 110 ° C. to about 200 ° C., and the heating time is about 20 seconds to about 9 minutes. A person skilled in the art can appropriately determine the optimum combination of heating temperature and heating time for the film laminated on the outer wall surface of the bottom plate member.

  Arbitrary means such as hot air, electric heat, and electron beam can be used as the heating means used when manufacturing the bowl-shaped paper container 1 of the present invention. If it is heated by hot air or electric heat in a tunnel equipped with conveyor means, mass production can be performed at low cost.

  The bowl-shaped paper container 1 of the present invention is gripped with one hand as described above when eating the contents. However, when the bowl-shaped paper container 1 is moved, it may be necessary to grip it with both hands. In such a case, as shown in FIG. 2, a body winding 25 is disposed on the outer wall surface side of the body member 3 of the bowl-shaped paper container 1, and a heat insulating space 27 is formed between the body member 3 and the body winding 25. A paper container 1B provided as is also possible. A feature of the body winding 25 is that a hole 29 for heat exchange is provided in the curl portion at the lower end. Since the hole 29 exists, the hot air in the heat insulation space 27 can be replaced with the external cold air by the user pushing and releasing the torso with a finger. Such a heat-insulating bobbin is described in Japanese Patent No. 3953992 owned by the present applicant.

  Alternatively, a paper container 1B having a foamed heat insulating layer 23 of a thermoplastic synthetic resin film on the outer wall surface of the body member 3 can be used. In order to form the foamed heat insulating layer 23 of the thermoplastic synthetic resin film on the outer wall surface of the barrel member 3, for example, a thermoplastic synthetic resin film having a relatively low melting point such as polyethylene is laminated on the outer wall surface side of the barrel member 3. In addition, after laminating a high melting point film on the inner wall surface, integrating the body member 3 and the bottom plate member 5 into a container, and then heating the container to a predetermined temperature, a paper base material is obtained. 7 evaporates, and the evaporated moisture causes the polyethylene film to be foamed to form the heat insulating layer 23. At the same time, the foam heat insulating layer 13 is also formed on the outer wall surface side of the bottom plate member 5.

On one side of a base paper of 260 g / m ² (water content 7.9%), low density polyethylene (LDPE) 25 μm / medium density polyethylene (MDPE) 15 μm / polyethylene terephthalate (PET) 12 μm / MDPE 15 μm were laminated in this order. A container body member blank was punched from this base paper. Next, lamination was performed in the order of 25 μm of low density polyethylene (LDPE) / 15 μm of medium density polyethylene (MDPE) / polyethylene terephthalate (PET) 12 μm / MDPE 15 μm on one side of a base paper of 260 g / m ² (water content 7.9%) LDPE of 35 μm was laminated on the surface. A container bottom plate member blank was punched from this base paper. The container body member blank and the container bottom plate member blank were integrated with a conventional cup molding machine so that the PET layer was on the inner wall surface of the container, and a paper container was assembled. The vessel had an opening hole diameter (W) of 144 mm, a depth (H) of 75 mm, and a body taper of 11 °. This paper container was placed in a conveyor oven having an inlet temperature of 120 ° C. and an outlet temperature of 120 ° C. and passed through the oven for 5 minutes. The LDPE layer on the outer wall surface side of the bottom plate member was foamed to form a foam heat insulating layer. The total thickness of the bottom plate member having the foam heat insulating layer was 0.86 mm.

480 ml of hot water having a temperature of 100 ° C. was poured into the bowl-shaped paper container thus obtained, and the surface temperature of the bottom center portion of the foam heat insulating layer on the outer wall surface side of the bottom plate member was measured with a surface thermometer. As a comparative example, the surface temperature of the bottom central portion on the outer wall surface side of the bottom plate member was also measured with a surface thermometer for the bowl-shaped paper container that was not foamed in the conveyor oven. The results are shown in Table 1 below.
(Table 1)
Time (min) Example (℃) Comparative example (℃)
Immediately after 79.8 91.9
0.5 79.2 88.9
1.0 78.8 86.4
1.5 77.5 85.0
2.0 76.1 82.7
2.5 75.2 81.0
3.0 73.9 79.5
4.0 71.8 76.9
5.0 69.7 74.1
6.0 67.7 71.6
7.0 65.4 69.4
8.0 64.3 67.8
9.0 62.9 65.5
10.0 61.0 64.4

  As is clear from the results shown in Table 1, immediately after pouring hot water into the container, the container having the foam insulation layer on the outer wall surface of the bottom plate member according to the embodiment of the present invention foams on the outer wall surface of the bottom plate member. The surface temperature of the bottom center portion on the outer wall surface side of the bottom plate member is 12 ° C. or more lower than that of the container of the comparative example in which no heat insulating layer exists. When the container contents are instant noodles, the time required for the noodles to return to the hot water is generally 3 minutes, and if it takes about 3 minutes from hot water injection to the start of eating, the outside of the bottom plate member of the container of the embodiment of the present invention Since the surface temperature of the bottom center part on the wall surface side is 73.9 ° C., the finger attached to the outer wall surface side of the bottom plate member of the container does not feel so much heat. Therefore, the container which has a foam heat insulation layer in the bottom-plate member outer wall surface of this invention is suitable as a container for instant noodles. On the other hand, since the surface temperature of the bottom center part on the outer wall surface side of the bottom plate member of the container of the comparative example is 79.5 ° C., the finger attached to the outer wall surface side of the bottom plate member of the container feels a strong feeling of heat, and the container It is difficult to attach a finger to the outer wall surface of the bottom plate member. Therefore, it takes about 5 minutes to reach a temperature of 74 ° C. at which the heat does not feel in the comparative container without the foam heat insulating layer on the outer wall surface of the bottom plate member, and may not be suitable as a container for instant noodles. Understandable.

Although the preferred embodiment of the bowl-shaped paper container of the present invention has been specifically described above, the bowl-shaped paper container of the present invention is not limited to the illustrated embodiment, and various modifications can be made. For example, a lid can be applied to the upper end surface of the mouth edge portion to form a sealed container.
The bowl type paper container of the present invention is a type that can be cooked in a microwave oven in addition to instant foods (for example, instant rice cake, instant soba noodles, instant ramen, instant soup, instant tea pickles, etc.) in which hot water is poured to restore the contents. Can also be used for hot foods.

DESCRIPTION OF SYMBOLS 1, 1A, 1B The bowl type paper container 3 of this invention Container body member 5 Container bottom board member 7 Edge part 9 Paper base material 11 Container inner surface laminated film 13 Foam heat insulation layer 15 of bottom board member outer wall surface Laminated film of bottom board member outer wall surface 17 container height 23 foam insulation layer 25 on outer wall surface of body member body winding 27 heat insulation space 29 ventilation hole

Claims (7)

  It consists of a body member and a bottom plate member, the ratio of the container opening inner diameter to the container depth is in the range of 1.5: 1 to 2.5: 1, and the taper of the side wall of the body member is in the range of 3 ° to 25 °. An inner bowl-shaped paper container, wherein a foam heat insulating layer is formed on an outer wall surface of the bottom plate member.   2. The bowl-shaped paper container according to claim 1, wherein the inner wall surfaces of the body member and the bottom plate member are coated with a liquid-permeable material.   3. A bowl-shaped paper container according to claim 2, wherein the liquid permeation-resistant material is a thermoplastic synthetic resin film or aluminum foil having a melting point higher than that of the foam insulation layer forming material.   The foam heat insulating layer is a low melting point thermoplastic laminated on the outer wall surface side of the paper base material constituting the bottom plate member by evaporating moisture contained in the paper base material constituting the bottom plate member upon heating. 4. A bowl-shaped paper container according to claim 1, which is formed by foaming a synthetic resin film. 2. A bowl-shaped paper container according to claim 1, further comprising heat insulating means disposed on the outer wall surface of the body member. 6. A bowl-shaped paper container according to claim 5, wherein the heat insulating means is a foam heat insulating layer of a low-melting point thermoplastic synthetic resin film laminated on the outer wall surface of the body member. 6. A bowl-shaped paper container according to claim 5, wherein the heat insulating means is a cylindrical shell wound disposed on the outer wall surface of the body member, and a heat insulating space is formed between the outer wall surface of the body member and the cylindrical shell coil. .

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