JP2000229675A - Thermal insulating container - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent deterioration of heat-insulating capacity for a thermal insulating container and to prevent protrusion of resin and intrusion of washing water at joined surfaces of the container by a method wherein meltable protuberances are formed respectively at welding parts of inner and outer containers, and the inner and outer containers are airtightly connected together with both of the meltable protuberances welded together. SOLUTION: While a side wall 10a of an outer container 10 is fitted into a space formed by the exterior and both of external and internal vertical parts 20c and 20d of an inner container 20, the external vertical part 20c of the inner container 20 is mounted on a mounting surface 10b of the outer container 10. A meltable protuberance 20f formed at the external vertical part 20c of the inner container 20 and a meltable protuberance 10d formed at the mounting surface 10b of the outer container 10 are brought close to each other. Furthermore, a resin rod 50 is inserted into an indented part 40 formed between projected parts 10c and 20e of the outer and inner containers 10 and 20. Then, while both of the meltable protuberances 10d and 20f are melted with hot air blown thereon, the resin rod 50 is pressed against the meltable protuberances and the resin rod 50 are welded to the outer and inner containers 10 and 20, and thereby both of the outer and inner containers 10 and 20 are airtightly connected together.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a box-shaped insulated container for storing foods and the like in a warm state, or for storing vegetables and fresh foods such as milk packs in a cool state. It is.

[0002]

2. Description of the Related Art Conventionally, an outer container 1 made of synthetic resin, an inner container 2 made of synthetic resin housed in an outer container 1 with a predetermined gap from the outer container 1, and an inner container A box-shaped heat insulating container in which a heat insulating material 3 formed of a foamed resin or the like is disposed in a gap formed between the outer container 2 and the outer container 1 is known.

A horizontal portion 2b extends outward from the upper end of the side wall 2a of the inner container 2, and an outer vertical portion 2c extending downward extends from the tip of the horizontal portion 2b. While being formed, an inner vertical portion 2d is vertically suspended from the lower surface of the horizontal portion 2b at such an interval that the outer vertical portion 2c and the upper end portion of the side wall 1a of the outer container 1 are fitted. . Also, below the outer vertical portion 2c of the inner container 2,
An outwardly extending protrusion 2e is formed, and a protrusion 2e formed below the outer vertical portion 2c of the inner container 2 is provided outside the upper end of the side wall 1a of the outer container 1 so as to face the protrusion 2e. , A similar protrusion 1b is formed.

Then, the upper end of the side wall 1a of the outer container 1 is fitted into the gap formed by the outer vertical portion 2c and the inner vertical portion 2d of the inner container 2, and the outer vertical portion 2c of the inner container 2 is By joining the lower end surface and the upper surface of the protrusion 1b of the outer container 1, the protrusion 1b of the outer container 1 is formed.
A recess 4 having a substantially semicircular cross section is formed between the inner container 2 and the protrusion 2 e of the inner container 2. A resin rod 5 having a substantially circular cross-section and formed of a hot-melt synthetic resin is inserted into the concave portion 4 having a substantially semi-circular cross-section, and the resin rod 5 is formed using a hot-air device (not shown). Fusing the resin rod 5 to the outer container 1 and the inner container 2 by melting the surface of the outer container 1 and the inner container 2 that contacts the outer container 1 and the inner container 2 and the peripheral surface of the outer container 1 and the inner container 2 that the resin rod 5 contacts. Thereby, the outer container 1 and the inner container 2 are connected. Thereafter, a resin liquid containing a foaming agent is injected into the gap between the outer container 1 and the inner container 2 and foamed, so that the gap between the outer container 1 and the inner container 2 is formed.
It is filled with a heat insulating material 3 made of a foamed resin. In addition, a heat insulating material 3 made of a foamed resin matching the shape of the gap between the outer container 1 and the inner container 2 is previously mounted on the outer container 1, and then the inner container 2 is stored in the outer container 1. At the same time, as described above, the surface of the resin rod 5 that contacts the outer container 1 and the inner container 2 and the peripheral surfaces of the outer container 1 and the inner container 2 that the resin rod 5 contacts are melted, and the resin rod 5 is The outer container 1 and the inner container 2 may be connected by welding to the container 1 and the inner container 2. Reference numeral 6 denotes a handle formed at an appropriate position on the outer container 1.

[0005]

In order to connect the outer container 1 and the inner container 2 in an airtight manner, the upper surface of the projecting portion 1b of the outer container 1 and the lower end surface of the outer vertical portion 2c of the inner container 2 must be connected. The vicinity of the outer joining line 7a of the joining surface 7 is melted by hot air blown from a hot air device (not shown),
The surface of the resin rod 5 that comes into contact with the vicinity of the outer joint line 7a must be melted by hot air blown from the hot air device at the same time, and the resin rod 5 must be welded to the entire periphery of the outer joint line 7a. However, in conventional insulated containers,
The concave portion 4 into which the resin rod 5 is inserted has a substantially semicircular cross-sectional shape, and the radius of the concave portion 4 for facilitating the insertion of the resin rod 5 is the radius of the resin rod 5. Since the resin rod 5 is formed larger, the resin rod 5 is easily moved in the concave portion 4 during the welding operation of the outer container 1 and the inner container 2 via the resin rod 5, and the resin rod 5 And recess 4
Because the contact area between the outer container 1 and the peripheral surface of the inner container 2 is small, the resin bar 5 may not be in contact with the outer joint line 7a, or the concave portion may be formed by hot air from a hot air device. The outer container 1 and the inner container 2 cannot be connected in an airtight state because the peripheral surfaces of the outer container 1 and the inner container 2 and the resin rod 5 on the outer joint line 7a side are not sufficiently melted. After the insulation performance of the heat insulating container is reduced, or after the outer container 1 and the inner container 2 are connected to each other,
When a resin liquid containing a foaming agent is injected into the gap between the outer container 1 and the inner container 2, the outer container 1 is not welded.
There is a problem that the resin protrudes from the joint surface 7 between the upper surface of the protruding portion 1b and the lower end surface of the outer vertical portion 2c of the inner container 2. Further, at the time of cleaning the insulated container, the cleaning water is supplied from the joint surface 7 between the upper surface of the projection 1b of the outer container 1 that is not welded and the lower end surface of the outer vertical portion 2c of the inner container 2.
The cleaning water that has penetrated into the gap formed between the outer container 1 and the inner container 2 freezes and expands, or causes post-foaming of the heat insulating material.
And the inner container 2 swells inward or outward.

An object of the present invention is to solve the above-mentioned problems of the conventional heat insulating container.

[0007]

According to the present invention, in order to achieve the above-mentioned object, firstly, a fusion protrusion is formed on a welded portion of an outer container and an inner container, and the fusion protrusion is melted. The second container is obtained by welding the outer container and the inner container via a resin rod, and the third is the outer container and the inner container. , The resin rod and the synthetic resin of the heat insulating material are all molded with the same synthetic resin or the same system.

[0008]

Embodiments of the present invention will be described below, but the present invention is not limited to these embodiments unless it departs from the gist of the present invention.

The heat insulating container according to the present invention also has an outer container 10 made of synthetic resin and a synthetic resin housed in the outer container 10 with a predetermined gap from the outer container 10, similarly to the above-mentioned conventional heat insulating container. And an inner container 20 made of
A gap formed between the outer container 10 and the inner container 20 is filled with a heat insulating material formed of a foamed resin or the like, similar to the heat insulating material 3 of the above-described conventional heat insulating container.

As in the case of the above-described conventional heat-insulating container, a horizontal portion 20b extends outward from the upper end of the side wall 20a of the inner container 20, and from the tip of the horizontal portion 20b, An outer vertical portion 20c extending downward is formed, and the outer vertical portion 20c and the upper end of the side wall 10a of the outer container 10 are separated from the lower surface of the horizontal portion 20b by a distance such that the outer vertical portion 20c and the upper end of the side wall 10a of the outer container 10 are fitted. An inner vertical portion 20d is vertically provided. In addition, a projecting portion 20e extending outward is formed on the outer periphery of the lower portion of the outer vertical portion 20c of the inner container 20, and further, at the lower end of the peripheral surface of the outer vertical portion 20c, below the projecting portion 20e, and A fusion projection 20f having a triangular cross section is formed outward.

A lower end surface of the outer vertical portion 20c of the inner container 20 is placed on the outer side of the upper portion of the side wall 10a of the outer container 10, and a block shape having substantially the same thickness as the outer vertical portion 20c. And a similar projection on the lower outer periphery of the mounting portion 10b so as to face a projection 20e formed on the lower outer periphery of the outer vertical portion 20c of the inner container 20. 10c is formed. The protruding portion 10 is provided at the upper end of the peripheral surface of the mounting portion 10b.
Above b and outward, a fusion protrusion 10d having a triangular cross section similar to the fusion protrusion 20f formed on the inner container 20 is formed.

The upper end of the side wall 10a of the outer container 10 is fitted into the gap formed by the outer vertical portion 20c and the inner vertical portion 20d of the inner container 20.
The lower end surface of the outer vertical portion 20c of the inner container 20 is placed on the upper surface of the mounting portion 10b of the outer container 10, and the melting protrusion 20 formed at the lower end of the peripheral surface of the outer vertical portion 20c of the inner container 20.
f and the melting protrusion 10d formed at the upper end of the peripheral surface of the mounting portion 10b of the outer container 10 are brought closer to each other. At this time, as shown in FIG. 1, the upper surface of the melting protrusion 10 d formed on the outer container 10 and the melting protrusion 20 formed on the inner container 20.
f, the lower surface of the inner container 20 is in contact with the lower surface of the outer container 10 to form one substantially triangular molten protrusion by the molten protrusion 20f formed on the inner container 20. preferable. Further, the upper end of the side wall 1a of the outer container 10 is fitted into a gap formed by the outer vertical portion 20c and the inner vertical portion 20d of the inner container 20, and the lower end surface of the outer vertical portion 20c of the inner container 20 is ,
When mounted on the upper surface of the mounting portion 10b of the outer container 10,
Projecting portion 10c of outer container 10 and projecting portion 20 of inner container 2
e, a recess 40 is formed.

A resin rod 50 having a substantially circular cross section and formed of a heat-fusible synthetic resin is inserted into the recess 40, and the resin is blown by hot air blown from a hot air device (not shown). The surfaces of the rods 50 located on the outer container 10 side and the inner container 20 side and the molten protrusions 10d formed on the outer container 10 and the molten protrusions 20f formed on the inner container 20 with which the resin rod 50 abuts are melted, and , Resin rod 50
Is pressed against the molten protrusions 10d and 20f in a molten state, whereby the resin rod 50 is welded to the outer container 1 and the inner container 2, and the outer container 10 and the inner container 20 are connected in an airtight state. Thereafter, a resin liquid containing a foaming agent is injected into the gap between the outer container 10 and the inner container 20 and foamed, and the gap between the outer container 10 and the inner container 20 is filled with a heat insulating material made of a foamed resin. . As in the case of the conventional heat insulating container, a heat insulating material made of a foamed resin matching the shape of the gap between the outer container 10 and the inner container 20 is attached to the outer container 10 in advance. 10
In the outer container 1 as described above.
0 and the inner container 20 can also be connected.

In the present embodiment, the portion of the outer container 10 and the inner container 20 where the resin rod 50 abuts is melted by the hot air blown from the hot air device.
Since d and 20f are formed, the fusion protrusions 10d and 20f are melted, and the surfaces located on the outer container 10 side and the inner container 20 side are melted by the hot air blown out from the hot air device, and the resin rod 50 is melted. Melting projections 10d, 20
f, the molten protrusions 10 d formed on the outer container 10 and the molten protrusions 2 formed on the inner container 20.
0f are welded together, and the molten protrusions 10d, 20f
And the resin rod 50 are welded, so that the outer container 10 and the inner container 20 are reliably connected in an airtight manner via the resin rod 50.

The above-mentioned projecting portion 10 of the outer container 10
c and the protruding portion 20e of the inner container 20 form a concave portion 40 into which the resin rod 50 is inserted, and when the outer container 10 and the inner container 20 are welded to each other, the resin rod 50 moves vertically. And the resin rod 50 functions to reliably press the molten protrusions 10d and 20f in the molten state.

In the embodiment shown in FIGS. 3 and 4, the use of the resin rod 50 is omitted, and the molten protrusions 10d formed on the outer container 10 and the molten protrusions 20 formed on the inner container 20 are omitted.
f, the hot plate 70 is pressed, and the molten protrusions 10d, 2d
0f is melted and the outer container 10 and the inner container 20 are welded. In this example,
Since the resin rod 50 is not used, the height of the molten protrusion 10d formed on the outer container 10 from the peripheral surface of the mounting portion 10b and the height of the molten protrusion 20f formed on the inner container 20 from the peripheral surface of the outer vertical portion 20c are reduced. Is preferably higher than the height when the above-described resin rod 50 is used.

Further, the conventional heat insulating container is made of a heat insulating material 3
Is molded of a polystyrene resin or a urethane resin, and the outer container 1 or the outer container 2 is molded of a polyolefin-based resin. Material 3 had to be separated. Therefore, there was a problem in the recyclability of the heat insulating container.

In order to solve the problem of the recyclability of the conventional heat insulating container described above, in the present embodiment, the outer container 10, the outer container 20, the resin rod 50 and the synthetic resin of the heat insulating material are all the same. It is formed of a synthetic resin or a resin of the same system, for example, a polyolefin resin. For example, the outer container 10, the outer container 20, the resin rod 50, and molded with polypropylene, and a heat insulating material,
Formed with high foam polypropylene. In addition, the outer container 1
0, the outer container 20 and the resin rod 50 are molded of polyethylene, and the heat insulating material is formed of highly foamed polyethylene. As described above, the outer container 10, the outer container 20, the resin rod 50, and the synthetic resin of the heat insulating material are all formed of the same synthetic resin or the same system, for example, a polyolefin-based resin. The entire heat insulating container can be recycled without separating the container 2 and the heat insulating material 3, and thus the workability of the recycling process of the heat insulating container is improved.

[0019]

Since the present invention has the above-described structure, the following effects can be obtained.

[0020] The outer container and the inner container are connected to each other by forming fusion protrusions on the welded portions of the outer container and the inner container, respectively, and by melting the fusion protrusion, the outer container and the inner container are connected. Can be connected.

Since the outer container and the inner container are welded via the resin rod, the outer container and the inner container can be more reliably connected in an airtight state.

Since the synthetic resin of the outer container, the outer container, the resin rod, and the heat insulating material are all formed of the same synthetic resin or the same resin, the workability of the recycling process of the heat insulating container is improved.

[Brief description of the drawings]

FIG. 1 is a vertical sectional view of a main part of an insulated container according to the present invention before the outer container is connected to the outer container.

FIG. 2 is a vertical sectional view of a main part of the heat insulating container of the present invention after the outer container is connected to the outer container.

FIG. 3 is a vertical sectional view of a main part of another embodiment of the outer container and the outer container of the heat insulating container according to the present invention before connection.

FIG. 4 is a vertical sectional view of a main part of another embodiment of the outer container and the outer container of the insulated container after connection according to the present invention.

FIG. 5 is a perspective view of a conventional heat insulating container.

FIG. 6 is a vertical sectional view taken along the line II of FIG. 5;

FIG. 7 is a vertical sectional view of a main part of the conventional heat insulating container after the outer container is connected to the outer container.

[Explanation of symbols]

 10 outer container 20 inner container 10d, 20f melting protrusion

Claims (3)

[Claims] 1. A heat insulating container characterized in that fusion projections are formed on welded portions of an outer container and an inner container, respectively, and the outer projection and the inner container are connected by melting the fusion projections. 2. The heat insulating container according to claim 1, wherein the outer container and the inner container are welded via a resin rod. 3. An insulated container, wherein the outer container, the inner container, the resin rod, and the synthetic resin of the heat insulating material are all formed of the same synthetic resin or the same system.