JPH09202365A - Heat-insulating container - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent an inner package from swelling inward to deform due to a sudden reduction in pressure or the like at the time of vacuum-precooling thereby allowing a food material such as boiled rice to be transported and supplied at a suitable temperature by providing a rib for preventing the inner package from deforming on an outer wall face of the inner package made of a synthetic resin. SOLUTION: As a rib 111 for preventing an inner package 11 from deforming, a circular rib 111a is placed at a center on a bottom 11a of the inner package 11 on a side in contact with a heat-insulating layer and a plurality of approximately linear ribs 111b starting at an end on the circle and extending radially to a periphery are provided. Similarly on a side 11b, a plurality of linear ribs 111c extending from the linear ribs 111b on the bottom 11a are provided vertically to the bottom 11a. Although a shape and a formation method of the rib 111 may not be specifically limited, by integrally molding at the time of forming the inner package 11, the inner package 11 having the rib 111 which may not deform by heat can be easily and inexpensively obtained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat insulating container, and more particularly to a heat insulating container having a heat insulating layer interposed between an inner body and an outer body made of synthetic resin.

[0002]

2. Description of the Related Art Conventionally, in a container (passage box) made of a synthetic resin for carrying foodstuffs, etc., an inner body made of a non-foamed synthetic resin is used so as to maintain a good heat-retaining condition. A structure in which a core material made of a foamed resin is interposed as a heat insulating layer between the exterior body and the exterior body is adopted.

In many cases, the above-mentioned container is frequently washed with water and sterilized with hot water for hygiene reasons. Therefore, in order to prevent water from entering between the inner body and the outer body, the joint between the inner body and the outer body is closed by welding with a thermoplastic resin to improve the integrity (for example, Japanese Patent Publication 5
9-11098) has been proposed.

As a method of assembling such a heat insulating container, after putting a heat insulating core material inside the exterior body, the interior body is further incorporated inside, and the joint portion between the interior body and the exterior body is made of a thermoplastic resin. The method of welding is adopted.

Although this joining is carried out under reduced pressure, it is unavoidable that air remains between the exterior body and the interior body, which are heat insulating layers, and the subsequent gas permeation and the load burden due to multi-stage stacking during container use. When hot rice etc. is stored inside the container due to the deformation caused by the above, the synthetic resin of the inner body becomes slightly soft due to the heat, and the inner body swells inward due to the expansion of the residual air described above and is deformed. There is.

In response to this, in Japanese Utility Model Laid-Open No. 3-43480, engaging portions are partially provided at corresponding positions on the outer peripheral surface of the inner body and the inner peripheral surface of the outer body to prevent deformation of the peripheral surface. Prevented insulated containers have been proposed.

[0007]

In order to prevent the deformation of the peripheral surface as described above, it is not possible to partially provide the engaging portions at the corresponding positions on the outer peripheral surface of the inner body and the inner peripheral surface of the outer body, respectively. As one of the effective measures, a complicated molding die is required to integrally mold the inner body and the outer body partially provided with the engaging portions, and such a molding die is expensive. This leads to higher costs. It is also possible to create and join the partially engaging parts separately from the inner body and the outer body, but this also increases the number of steps and leads to higher costs.

On the other hand, recently, a method of use has been adopted in which hot rice or the like is stored in these heat-insulating containers and then rapidly cooled to an optimum temperature by vacuum pre-cooling and kept at that temperature. For example, it is said that the optimum use temperature for sushi rice is 40 to 45 ° C. After storing hot rice (75 to 85 ° C) that has just been cooked in an insulating container and mixing vinegar and seasonings together, 4 within a short time by vacuum pre-cooling
Cool to 0-45 ° C, then keep warm at this temperature and transport,
Supplied.

In this vacuum precooling, the atmospheric pressure is 30 to 40.
Although the pressure is sharply reduced to about mmHg, when such a rapid pressure reduction is performed while the synthetic resin of the interior body inside the container containing hot rice etc. is slightly softened by heat, the interior body, especially the bottom There is a case where a deformation occurs such that the swells inward, which is a new problem.

[0010]

According to the present invention, in order to solve the above-mentioned problems, in a heat insulating container having a heat insulating layer interposed between an inner body made of synthetic resin and an outer body, Ribs are provided on the outer wall surface to prevent deformation of the interior body.

[0011]

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

FIG. 1 is a partially cutaway exploded perspective view showing a heat insulating container A according to an embodiment of the present invention.

In the container body (1) shown in this figure, an inner body (11) and an outer body (12) are separately formed, and a heat insulating layer (13) made of a synthetic resin foam is interposed between them. In this state, the ends of the inner body (11) and the outer body (12) are joined together by welding means or the like. As a concrete means for joining, the respective ends of the inner body (11) and the outer body (12) are butted against each other on the outer surface, and a groove is formed at the butted portion. A method is employed in which a welding rod is used for welding to hermetically bond and integrate. Reference numeral (14) indicates the joint portion.

The ends of the inner body (11) and the outer body (12) can be joined to each other by other means such as adhesion, but from the viewpoints of maintaining airtightness, joining strength, etc., they are welded as described above. Preferably by means.

The inner body (11) and the outer body (12) are integrally formed into a hollow shape by hollow molding, or the inner body (11) and the outer body (1) are joined by the above-mentioned joining means.
2) is joined to form a hollow shape, and then urethane or the like is injected into the inside of the hollow and foamed to form the heat insulating layer (1
3) is good.

Like the container body (1), the lid body (2) fitted to the container body (1) has an inner body (21) and an outer body (22) made of non-foaming synthetic resin. ) With a synthetic resin foam as a heat insulating layer (23). The lid (2) is also formed in the same manner as the container body (1), but in the case of this embodiment,
The inner body (21) and the outer body (22) are integrally formed into a hollow shape by hollow molding, and urethane or the like is injected and foam-molded into the hollow to fill the heat-insulating layer of the foam ( 23). Reference numeral (24) indicates a mouth portion which is closed after the injection and foaming.

FIG. 2 shows an inner body (1) of the container body (1).
It is a perspective view which shows the outer wall surface of 1). As shown in this figure,
Ribs (111) for preventing deformation of the inner body (11) are provided on the outer wall surface of the inner body (11), that is, on the bottom surface (11a) and the side surface (outer peripheral surface) (11b) that are in contact with the heat insulating layer (13). ) Is provided.

As a rib (111) for preventing this deformation, a circular rib (111a) is arranged at the substantially central portion of the bottom surface (11a) of the interior body (11), and the end originates from this circle. A plurality of substantially linear ribs (111b) are provided so as to extend radially around the periphery. On the side (11b),
A plurality of linear ribs (111c) extending from the linear ribs (111b) of the bottom surface (11a) are provided in a direction perpendicular to the bottom surface (11a). In addition, a part of the plurality of linear ribs (111b) is such that the ribs (111b) and the ribs (111c) that are continuous with each other form a right angle at the boundary between the bottom surface (11a) and the side surface (11b). , Bent before reaching the side surface (11b).

In the present invention, the shape of the ribs provided to prevent the deformation of the inner body (11) is not limited to that of the above embodiment, and any shape may be used as long as the object can be achieved. Good. Another embodiment will be described below.

FIG. 3 is a perspective view showing the outer wall surface of the inner body (31) of the heat insulating container B according to the second embodiment of the present invention, and FIG. 4 is the third embodiment of the present invention. FIG. 6 is a perspective view showing an outer wall surface of an inner body (51) of the heat insulating container C.

In these embodiments, the shape of the portion other than the inner body of the container body and the shape of the lid, the internal structures of both, and the forming method thereof are the same as those in the first embodiment.

As shown in FIG. 3, a rib (311) consisting of a plurality of straight lines parallel to each other is provided on the outer wall surface of the inner body (31) of the heat insulating container B. That is, on the bottom surface (31a) of the inner body (31), a plurality of linear ribs (311
a) are arranged so that they intersect at a substantially right angle to form a grid,
On the side surface (31b), a plurality of linear ribs (311b) extending from the bottom rib (311a) are provided in a direction perpendicular to the bottom surface (31a).

Interior body (51) of the heat insulating container C shown in FIG.
In, a rib (511) having a different shape is provided. That is, an octagonal rib (511a) is provided on the bottom surface (51a) at substantially the center, and linear ribs (511b) starting from the six corners of the octagon are provided. On the side surface (51b) of the inner body (51), the bottom surface (51
A linear rib (511c) extending from the linear rib (511b) of (a) is provided in the smoke direct direction with respect to the bottom surface (51a).

The height of the rib for preventing the above deformation is preferably about 0.5 to 5 mm. If it is less than 0.5 mm, a sufficient reinforcing effect may not be obtained in many cases, and if ribs higher than 5 mm are provided, sink marks are likely to occur on the inner peripheral surface of the interior body.

The width of this rib is preferably about 1 to 5 mm. If it is less than 1 mm, the strength of the rib itself or the reinforcing effect of the rib tends to be insufficient, and if it exceeds 5 mm, sink marks are likely to occur on the inner peripheral surface of the molded product, and it becomes difficult to release from the molding die during molding. There are cases.

Further, it is preferable that the ribs are provided at a pitch of 300 mm or less, and especially at the corners of the interior body at a pitch of 100 mm or less so that the bottom portion of the interior body is inward due to a sudden pressure reduction during vacuum precooling. It is possible to effectively prevent the bulging deformation.

The method of forming the ribs is not particularly limited, but if the inner body is integrally molded, the inner body having the ribs can be easily and inexpensively obtained.

Ribs that meet the above conditions (height: 3 mm,
Hot rice (80 ° C.) was placed in each of the heat-insulating containers of Examples A, B, and C provided with a width of 1 mm) and vacuum-cooled to 40
When rapidly cooled to ℃, no visible deformation of the inner body occurred in any of the heat insulating containers.

The heat insulating layers of the container body (1) and the lid (2) are made of styrene resin, polyolefin resin, or the like, which can be in-mold bead foam molded, or urethane, etc., which can be injection foam molded. And a foam is used. Among them, urethane foam is preferable from the viewpoint of heat insulation.

The styrene resin includes not only a homopolymer of styrene monomer but also a copolymer. In addition to styrene, styrene-based monomers include methylstyrene, ethylstyrene and the like. Further, the copolymer includes a copolymer containing styrene monomer in an amount of 50 mol% or more. As the counterpart monomer of the copolymer, methacrylic acid ester such as methyl methacrylate, acrylic acid ester, acrylic acid,
Methacrylic acid, acrylonitrile, maleic anhydride, etc. may be mentioned. In addition, butadiene rubber, high-impact polystyrene, styrene-butadiene block copolymer resin, graft copolymer resin and the like can be appropriately mixed with the styrene resin.

Examples of the above-mentioned polyolefin resin include polyethylene, polypropylene, copolymers thereof, copolymers with other polymers copolymerizable therewith, and mixtures thereof. Further, a resin obtained by copolymerizing a polyethylene resin and styrene can be preferably used.

As the interior body and the exterior body, a polyolefin resin such as polyethylene or polypropylene, a styrene resin, or other synthetic resin having a relatively good shape retention strength is used. In the case of a heat-insulating container used for normal purposes, the thickness of both interior and exterior walls of this non-foamed resin is 0.5.
Approximately 3.0 mm is suitable.

Incidentally, the container body and the lid body are provided with a handle ordinarily provided in this kind of container, a fixture for fixing the lid body to the container body and maintaining a hermetically sealed state, if necessary. Just do it.

[0034]

As described above, according to the present invention, there is provided a heat insulating container having a heat insulating layer interposed between an inner body and an outer body made of a synthetic resin, the inner body being hard to be deformed. Can be obtained at low cost. In particular, it is possible to prevent the interior body from swelling and deforming due to a sudden pressure reduction during vacuum pre-cooling, so it is possible to meet the distribution requirement to transport and supply foodstuffs such as rice at an appropriate temperature. Become.

[Brief description of drawings]

FIG. 1 is a partially cutaway exploded perspective view of a heat insulating container A according to an embodiment of the present invention.

FIG. 2 is a perspective view showing an outer wall surface of an inner body (11).

FIG. 3 is a perspective view showing an outer wall surface of an inner body (31) of a second embodiment.

FIG. 4 is a perspective view showing an outer wall surface of an inner body (51) of a third embodiment.

[Explanation of symbols]

A ... Insulation container 1 ... Container body 11, 31, 51 ... Interior body 11a, 31a, 51a ... Bottom surface 11b, 31b, 51b of interior body ... Side surface 12 of interior body ... Exterior body 13 ... Thermal insulation layers 111, 111a-c, 311, 311a, 311b, 511, 511a-c ...
Rib 2 ... Lid 21 ... Interior 22 ... Exterior 23 ... Insulation layer

Claims (1)

[Claims] 1. A heat insulating container having a heat insulating layer interposed between an inner body and an outer body made of synthetic resin, wherein ribs for preventing deformation of the inner body are provided on an outer wall surface of the inner body. Insulated container characterized by being provided.