JP6987553B2 - Microwave oven container - Google Patents

Description

The present invention relates to a microwave oven container for heating the contents in a microwave oven.

In recent years, cup-shaped resin containers that contain liquid foods and drinks as contents have been widely used. As the resin container, one used for heating the contents using a microwave oven is known. However, if the viscosity of the contents is high, convection of the contents is unlikely to occur in the container. Therefore, when a highly viscous content is heated in a microwave oven using such a container, the content near the bottom surface of the container becomes overheated above the boiling point, and bumping may occur.

To solve such a problem, for example, a porous thin film is formed on the bottom surface of the container by applying glass powder to the bottom surface of the container and then heating the glass powder to adhere to the bottom surface of the container in a semi-molten state. A container for a microwave oven that prevents sudden boiling is known (see, for example, Patent Document 1). Further, for example, a microwave oven container for preventing bumping by providing a thin plate cut out from a quartz glass ingot having fine bubbles on the bottom surface of the glass container is also known (see, for example, Patent Document 2).

Japanese Unexamined Patent Publication No. 8-242998 Japanese Patent No. 2925576

However, since the above-mentioned microwave oven container uses glass powder or a thin glass plate, there is a problem that the manufacturing cost is high. Further, when a thin plate having fine bubbles is welded to the bottom of the container as in the technique of Patent Document 2, the thin plate may be damaged or the fine bubbles may be damaged at the time of welding.

Therefore, an object of the present invention is to provide a container for a microwave oven capable of preventing bumping at low cost.

According to one aspect of the present invention, the container for a microwave oven is provided on a body, a container body having a bottom integrally provided at the lower end of the body, and a part thereof on the bottom side of the container body. The porous sheet is provided with a porous sheet fixed to the container body, the porous sheet has an open cell structure and is provided on the inner surface of the bottom portion, and the porous sheet is formed on the foam layer and the foam layer. It has an adhesive layer that is laminated and arranged on the inner surface side of the bottom portion, and a part of the adhesive layer is welded to the inner surface of the bottom portion .

The present invention can provide a microwave oven container capable of preventing bumping at low cost.

The cross-sectional view which shows the structure of the microwave oven container which concerns on one Embodiment of this invention from the perspective. The cross-sectional view which shows the structure of the container for the microwave oven. The cross-sectional view which shows the structure of the porous sheet used for the container for the microwave oven. A cross-sectional view showing a part of the manufacturing process of the microwave oven container and a part of the manufacturing equipment in a perspective view. A cross-sectional view showing a part of the manufacturing process of the microwave oven container and a part of the manufacturing equipment. A flow chart showing a cross-sectional view of the manufacturing process of the microwave oven container. The plan view which shows the structure of the welded part of the porous sheet of the microwave oven container which concerns on 1st modification of this invention. The plan view which shows the structure of the welded part of the porous sheet of the microwave oven container which concerns on the 2nd modification of this invention. The plan view which shows the structure of the welded part of the porous sheet of the microwave oven container which concerns on the 3rd modification of this invention. The plan view which shows the structure of the welded part of the porous sheet of the microwave oven container which concerns on the 4th modification of this invention. The plan view which shows the structure of the welded part of the porous sheet of the microwave oven container which concerns on 5th modification of this invention.

Hereinafter, the microwave oven container 1 according to the embodiment of the present invention will be described with reference to FIGS. 1 to 11.
1 and 2 are cross-sectional views showing the configuration of the microwave oven container 1 according to the embodiment of the present invention from a perspective view and a side view, and FIG. 3 is a configuration of a porous sheet 12 used for the microwave oven container 1. 4 and 5 are cross-sectional views showing a part of the manufacturing process of the microwave oven container 1 and a part of the structure of the manufacturing apparatus from a perspective view and a side view, respectively, and FIG. 6 is a cross-sectional view of the microwave oven container 1. It is a flow chart which shows the manufacturing process in the cross section.

As shown in FIGS. 1 and 2, the microwave oven container 1 includes a bottomed cylindrical container body 11 and a porous sheet 12 provided on the inner surface of the container body 11. The microwave oven container 1 is a cup-shaped container that contains liquid foods such as soup and sake as contents and is sealed by welding a sheet-shaped lid to the open end. The microwave oven container 1 is a container that can be heat-treated by a microwave oven with the contents removed, for example, when the contents are cooked.

The container body 11 is configured, for example, in a bottomed cylindrical shape. As a specific example, the container body 11 has a cylindrical body portion 21 and a disk-shaped bottom portion 22. The container body 11 is made of, for example, a polyolefin resin, specifically polypropylene.

The body portion 21 is configured in a tapered shape that gradually reduces the diameter from the end end side to the bottom portion 22, for example. One end of the body portion 21 is closed by the bottom portion 22, and the other end is opened. The body portion 21 has a flange portion 21a to which a sheet-shaped lid is welded on the outer peripheral edge of the opening end portion.

The bottom portion 22 has a dome-shaped central portion 22a protruding inside the container main body 11 and an annular groove portion 22b provided on the peripheral edge portion of the central portion 22a and recessed from the inner surface side of the bottom portion 22. In other words, in the bottom portion 22, the central side of the bottom portion 22 is formed in a dome shape, and the peripheral edge portion of the bottom portion 22 projects in an annular shape to the outside of the container body 11.

As shown in FIG. 3, the porous sheet 12 is, for example, a circular sheet, and is configured to have an open cell structure composed of a plurality of bubbles. The porous sheet 12 includes a foam layer 31 composed of a plurality of bubbles and an adhesive layer 32 laminated on the main surface of the foam layer 31. The porous sheet 12 is configured, for example, with an outer diameter equal to or smaller than the inner diameter of the groove portion 22b of the bottom portion 22. In other words, the porous sheet 12 is fixed to the dome-shaped central portion 22a. The porous sheet 12 is formed of a thermoplastic resin material such as a polyolefin resin such as polyethylene or polypropylene.

The foamed layer 31 has a large number of openings on the surface by foaming a resin material to form an open cell structure. In other words, the foam layer 31 constitutes a bubble-breaking state in which a part of a large number of bubbles opens on the surface and communicates with the outside. For example, the average diameter of the opening of the bubbles in the foam layer 31 is preferably 200 μm to 500 μm, and the opening area ratio of the bubbles is preferably 30% to 80% with respect to the area of the main surface of the foam layer 31.

The adhesive layer 32 is a skin layer provided for fixing the foam layer 31 to the container body 11. The adhesive layer 32 is laminated on the foam layer 31 and has a non-foam structure. The adhesive layer 32 fixes the foam layer 31 to the bottom 22 by welding. The adhesive layer 32 does not affect the contents to be accommodated, and if the porous sheet 12 is fixed to the bottom portion 22, it is not limited to fixing by welding, but is fixed by an adhesive or the like. There may be.

A part of such a porous sheet 12 is welded to the central portion 22a of the bottom portion 22. As a specific example, the porous sheet 12 is welded to the central portion 22a in a ring shape. In other words, the porous sheet 12 has a ring-shaped welded portion 12a and has a non-welded portion on the central side. The welded portion 12a is configured to have a welding width of, for example, about 1 mm to 3 mm. In the present embodiment, the welding width is the radial width of the ring-shaped welded portion 12a. For example, when the welded portion 12a is linear, it is the width in the direction orthogonal to the extending direction of the linear shape.

The area of the welded portion 12a is preferably less than 50% of the area of the porous sheet 12.

Next, as a method for manufacturing such a microwave oven container 1, a method of welding a porous sheet 12 to a container body 11 will be described with reference to FIGS. 4 to 6.

First, the manufacturing apparatus 100 used for manufacturing the microwave oven container 1 will be described with reference to FIGS. 4 and 5. As shown in FIGS. 4 and 5, the manufacturing apparatus 100 for welding the porous sheet 12 to the container body 11 includes a receiving mold 101 and an ultrasonic horn 102. Further, the manufacturing apparatus 100 includes an ultrasonic oscillator, a converter, a booster, and the like connected to the ultrasonic horn 102. The receiving mold 101 has a shape along the outer surface shape of the bottom portion 22 and supports the bottom portion 22. In the ultrasonic horn 102, the shape of the end face in contact with the porous sheet 12 is configured to be the shape of the welded portion 12a. In the present embodiment, the ultrasonic horn 102 is formed in a cylindrical shape, so that the end face shape is formed in an annular shape.

Next, a method of manufacturing the microwave oven container 1 using such a manufacturing apparatus 100 will be described. First, as shown in the upper figure of FIG. 6, the porous sheet 12 formed in a circular shape is inserted into the container body 11, and the porous sheet 12 is arranged on the bottom 22. Next, the receiving mold 101 is opposed to the bottom portion 22, and the ultrasonic horn 102 is opposed to the porous sheet 12 arranged on the bottom portion 22.

Next, as shown in the middle figure of FIG. 6, the porous sheet 12 is pressed against the bottom 22 by the ultrasonic horn 102 in a state where the bottom 22 is supported by the receiving mold 101, and the porous sheet is pressed by the ultrasonic horn 102 in that state. Fine ultrasonic vibration is applied to 12 and the bottom 22. By this step, the adhesive layer 32 is melted and the porous sheet 12 is welded to the bottom portion 22. As a result, the microwave oven container 1 in which the porous sheet 12 is fixed to the container body 11 is manufactured. In this step, the foam layer 31 of the porous sheet 12 pressurized by the ultrasonic horn 102 is compressed and deformed, and the foam structure is crushed.

Then, as shown in the lower figure of FIG. 6, the manufacturing process is completed by removing the receiving mold 101 and the ultrasonic horn 102 from the microwave oven container 1.

According to the microwave oven container 1 configured in this way, the porous sheet 12 is fixed to the bottom 22 of the container body 11, and when the contents are heated by the microwave oven, air bubbles are generated from the porous sheet 12. Can be generated to encourage convection of the contents. As a result, the microwave oven container 1 can prevent the contents from bumping due to heating by the microwave oven.

Further, since the porous sheet 12 is made of resin molding and has a simple structure in which the porous sheet 12 is welded to the bottom portion 22 of the container body 11 by welding, the manufacturing cost can be suppressed.

Further, since the porous sheet 12 is configured to be welded to the bottom portion 22 only partially, it is possible to suppress the collapse of the foam layer 31 at the time of welding as much as possible. Therefore, the microwave oven container 1 can prevent the function of suppressing bumping from being impaired.

Further, since the microwave oven container 1 has a structure in which the porous sheet 12 is annularly fixed to the bottom portion 22, it is possible to prevent the porous sheet 12 from being separated from the bottom portion 22 and to be turned over. As a result, the microwave oven container 1 can generate bubbles from the porous sheet 12 on the bottom 22 side of the container body 11, so that convection can be further promoted and the aesthetic appearance can be reduced due to the separation and turning. Can be prevented.

Further, the porous sheet 12 is not configured to weld the foam layer 31 directly to the bottom portion 22, but is configured to have an adhesive layer 32 for welding to the bottom portion 22, so that the portion that does not adhere to the bottom portion 22 is porous. Even if it is provided on the sheet 12, it can be reliably adhered to the bottom portion 22.

As described above, according to the microwave oven container 1 according to the embodiment of the present invention, by fixing the porous sheet 12 having an open cell structure to the bottom 22 of the container body 11, bumping can be prevented at low cost.

The microwave oven container 1 is not limited to the above configuration. For example, the structure in which the welded portion 12a of the porous sheet 12 fixed to the bottom portion 22 is welded in an annular shape has been described, but the present invention is not limited to this. For example, as in the porous sheet 12A of the first modification shown in FIG. 7, a plurality of rectangular welded portions 12a are intermittently arranged in an annular shape on the peripheral edge of the circular porous sheet 12A in the circumferential direction. May be configured. Further, as in the porous sheet 12B of the second modification shown in FIG. 8, a plurality of welded portions 12a extending radially and linearly in the circumferential direction are intermittently formed on the peripheral edge portion of the circular porous sheet 12B. It may be configured to be arranged in a ring shape.

Further, even if the porous sheet 12C of the third modification shown in FIG. 9 is provided with an annular and lollet-shaped welded portion 12a on the peripheral edge of the circular porous sheet 12A. good. Further, as in the case of the porous sheet 12D of the fourth modification shown in FIG. 10, a welded portion 12a extending radially from the center of the circular porous sheet 12D may be provided. Like the porous sheet 12E of the fifth modification shown in 11, the structure may be such that the radial welded portion 12a similar to the porous sheet 12D is formed into a lollet shape.

Further, in the above-mentioned example, the structure in which the porous sheet 12 has a circular shape has been described, but the structure is not limited to this, and the porous sheet 12 may have a rectangular shape, for example. However, the porous sheet 12 preferably has a shape arranged in the central portion 22a of the bottom portion 22 in order to prevent turning over and the like. Further, the porous sheet 12 may be configured to have a design such as a mark or a pattern depending on its shape or the shape of the welded portion 12a, for example. Further, in the above-mentioned example, the configuration in which the porous sheet 12 is fixed to the inner surface of the dome-shaped central portion 22a has been described, but the present invention is not limited to this, and the porous sheet 12 is provided on the inner peripheral surface on the lower end side of the body portion 21. It may be configured, or it may be configured to be provided on both the inner peripheral surface on the lower end side of the central portion 22a and the body portion 21. That is, the porous sheet 12 can be appropriately set as long as it has a configuration capable of generating convection in the container body 11.

Further, in the above-mentioned example, the porous sheet 12 has been described by using an example of fixing by welding by ultrasonic waves, but if it does not affect the contents and can be fixed to the bottom 22, it is heat-sealed. It may be configured to be bonded with an adhesive, or it may be configured to be bonded using an adhesive. Further, in the above-mentioned example, the structure in which the container main body 11 has a bottomed cylindrical shape has been described, but the present invention is not limited to this, and the container body 11 may have a bottomed rectangular cylindrical shape or another shape. good.

That is, the present invention is not limited to the above embodiment, and can be variously modified at the implementation stage without departing from the gist thereof. In addition, each embodiment may be carried out in combination as appropriate, in which case the combined effect can be obtained. Further, the above-described embodiment includes various inventions, and various inventions can be extracted by a combination selected from a plurality of disclosed constituent requirements. For example, even if some constituent elements are deleted from all the constituent elements shown in the embodiment, if the problem can be solved and the effect is obtained, the configuration in which the constituent elements are deleted can be extracted as an invention.
The following is a description equivalent to the invention described in the claims of the original application of the present application.
[1] A container body having a body portion and a bottom portion integrally provided at the lower end of the body portion, and a container body.
A container for a microwave oven provided with a porous sheet provided on the bottom side of the container body and partially fixed to the container body.
[2] The microwave oven container according to [1], wherein the porous sheet has an open cell structure.
[3] The microwave oven container according to [2], wherein the porous sheet is provided on the inner surface of the bottom portion.
[4] The porous sheet has a foam layer and an adhesive layer laminated on the foam layer and arranged on the inner surface side of the bottom portion, and a part of the porous sheet is welded to the inner surface of the bottom portion. 3] The microwave oven container.
[5] The body is formed in a cylindrical shape.
The microwave oven container according to [4], wherein the porous sheet is formed in a circular shape and is welded to the inner surface of the bottom in an annular shape.
[6] The body is formed in a cylindrical shape.
The microwave oven container according to [4], wherein the porous sheet is formed in a circular shape and is radially welded to the inner surface of the bottom portion.

1 ... Microwave oven container, 11 ... Container body, 12 ... Porous sheet, 12a ... Welding part, 21 ... Body part, 21a ... Flange part, 22 ... Bottom part, 22a ... Central part, 22b ... Groove part, 31 ... Foam layer , 32 ... Adhesive layer, 100 ... Manufacturing equipment, 101 ... Receiving type, 102 ... Ultrasonic horn.

Claims (3)

A container body having a body portion and a bottom portion integrally provided at the lower end of the body portion, and a container body.
A porous sheet provided on the bottom side of the container body and partially fixed to the container body,
Equipped with
The porous sheet has an open cell structure and is provided on the inner surface of the bottom portion.
The porous sheet has a foam layer and an adhesive layer laminated on the foam layer and arranged on the inner surface side of the bottom portion, and a part thereof is welded to the inner surface of the bottom portion. .. The body is formed in a cylindrical shape.
The microwave oven container according to claim 1 , wherein the porous sheet is formed in a circular shape and is welded to the inner surface of the bottom in an annular shape. The body is formed in a cylindrical shape.
The microwave oven container according to claim 1 , wherein the porous sheet is formed in a circular shape and is radially welded to the inner surface of the bottom portion.

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