JP2000254017A - Heat insulating container and its manufacture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an easily mountable shoulder member capable of protecting the joint part of a double-wall container from impact by forming an engaging recessed part in an upper part and an engaging protruded part in a lower part and forcedly fitting one in the other with a flange part sandwiched from above and below. SOLUTION: An upper part 20a is constituted of a handle part 13 and a shoulder member 60 in a ring-shaped structure of outer diameter slightly larger then the outer diameter of the flange part 8 of a double-wall container 25. A lower part 20b is a ring-shaped member of inner diameter slightly larger than the outer diameter of the flange part 8 of an outer container 3. The upper part 20a and the lower part 20b can be joined together via an engaging recessed part 32a and an engaging protruded part 32b, and sandwiches the flange part 8 of the double-wall container 25 from above and below. As the flange part 8 is being sandwiched with the flange part 8 pressed from above and below, the upper part 20a and the lower part 20b are fused together at shoulder part fusing and joining parts.

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 for accommodating beverages and the like, and more particularly to a heat insulating container for accommodating beverages and the like so that the temperature does not change and a method for producing the same.

[0002]

2. Description of the Related Art As an insulated container made of synthetic resin or glass, an inner container is disposed inside an outer container having a shape larger than that of the inner container, and the inner container and the outer container are bonded to each other at an opening end. A double-walled container having a gap between the outer surface of the inner container and the inner surface of the outer container is known. However, in such an insulated container, since the inner container and the outer container are joined by a method such as welding, there is a problem that the joining portion has poor mechanical strength. In particular, in a heat-insulating container having a large capacity, a method of increasing the welding area of the joint has been desired in order to increase the mechanical strength of the joint.

In some cases, a shoulder member having a handle, a spout, and the like is attached to a container such as an insulated container. Examples of such a method of attaching the shoulder member include a method of welding a mounting jig to the container body and attaching a handle to the mounting jig, and a screw type capable of fitting a shoulder member having a handle and the container body to the container body. Conventionally, there has been known a method of screwing each other. When welding the mounting jig, there may be a problem in strength depending on the container to be mounted. That is, when the container body is made of a material having low mechanical strength, such as synthetic resin or glass, depending on the weight of the material accommodated in the container, a load exceeding the allowable value may be applied to the mounting jig. In such a case, the mechanical strength of the container becomes insufficient. On the other hand, in the case where the container body and the shoulder member are screw-type, there is no problem such as when using the mounting jig, but it is difficult to mount the container body having a structure in which a flange portion is formed on the container body. There is a problem that there is. Therefore, there has been a demand for the development of a shoulder member having a structure that can be more easily attached to a container than a conventional member attachment method.

[0004]

SUMMARY OF THE INVENTION In accordance with the present invention, there is provided an insulated container having a shoulder member which is capable of protecting a joint portion of a double-walled container from impact and which is easy to mount, and a method of manufacturing the same. Is intended to

[0005]

To solve the above problems and achieve the object of the present invention, the present invention is configured as follows. That is, in the heat insulating container of the present invention, the inner container is accommodated in the outer container with a gap therebetween, and these are integrally formed into a double-walled container and attached to the opening of the double-walled container. A shoulder member is provided, and an end protruding outward from the outer surface of the inner container is formed at the opening of the inner container, and at the opening of the outer container, outward from the outer surface of the outer container. A protruding end is formed, and the ends form a melt-bonded flange, and the shoulder member includes an upper part and a lower part, and the upper part and the lower part sandwich the flange. It is characterized by being linked by. Further, the heat insulating container of the present invention is characterized in that the upper part and the lower part are forcibly fitted to each other. Further, in the heat insulating container of the present invention, the upper part and the lower part are formed with shoulder member welds that are in contact with each other when the upper part and the lower part are fitted, and the shoulder member welds are welded to each other. Is desirable.

Further, in the method for manufacturing a heat insulating container according to the present invention, the inner container is accommodated in the outer container with a space therebetween, and a double-walled container is formed by integrating the inner container with the inner container. An end portion protruding outward from the outer surface of the inner container, and an end portion protruding outward from the outer surface of the outer container to the opening of the outer container to form a flange portion by fusion bonding, The upper part and the lower part constituting the shoulder member are connected to each other while sandwiching the flange.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In the following, an insulated container of the present invention and a method of manufacturing the insulated container of the present invention will be described with reference to the insulated container 1 as an embodiment of the present invention shown in FIGS. Will be described. FIG. 1 is a longitudinal sectional view of the entire image of the heat insulating container 1. FIG. 2 shows a double-walled container 25 which is a main part of the heat-insulating container 1 of FIG. 1, and FIG. 3 shows a bottom of the double-walled container 25 of FIGS. 1 and 2. And FIG.
5 shows the shoulder member 20, and FIG. 6 shows a plug 1 attached to the shoulder member 20 for closing the double-walled container 25.
5 is a longitudinal sectional view of FIG.

As shown in FIG. 1, the heat-insulating container 1 has a double-walled container 25 in which an inner container 2 is housed in an outer container 3 with a gap 4 therebetween, and these are integrally formed. It roughly comprises a shoulder member 20 attached to the opening 40 of the wall container 25 and a plug 15 for closing the double wall container 25. As shown in FIG. 2, both the inner container 2 and the outer container 3 are formed in a bottomed cylindrical shape having openings 40 and 41 at one end, and the inner containers 2 and the outer container 3 are provided in the openings 40 and 41. End portions 2 projecting outward from the respective cylindrical portions of the container
a, 3a are formed. And these ends 2a, 3a
The two are welded to each other to form a flange portion 8 to form a double-walled container 25. On the other hand, the shoulder member 20 shown in FIGS. 1, 4, and 5 includes an upper part 20a and a lower part 20b which are formed to be connected to each other.

The upper part 20a shown in FIGS. 4 and 5
Is composed of a shoulder main body 60 having an annular structure having an outer diameter slightly larger than the outer diameter of the flange 8 of the double-walled container 25 and the handle 13. The shoulder main body 60 has a spout 11 protruding outward from the shoulder main body 60 and a plug attaching part 12, and the handle 13 is integrally attached to the shoulder main body 60. The shoulder body 60 has a cylindrical shape, the outer diameter of which is substantially equal to the inner diameter of the opening 40, and
The plug mounting portion 12 is formed to hang down.
A packing 31 is attached to the outer periphery of 2. The outer diameter of the lowermost end of the plug mounting portion 12 is smaller than the outer diameter of the upper portion thereof, and a step is formed at the lowermost end of the plug mounting portion 12. A groove that opens downward with respect to the shoulder body 60 is provided in the step portion over the entire circumference of the lowermost end. By engaging this groove with the engaging portion 33 of the packing 31 and fixing them together, the contents in the heat insulating container 1 can be moved to the plug attaching portion 12.
And the like, and between the packing 31 and the like. In addition, the packing 31 is the opening 40 of the double wall container 25.
The tightness of the heat insulating container 1 is ensured by closely adhering to the inner diameter of. Further, on the outer periphery of the shoulder body 60, a groove-shaped engaging recess 32a is provided in the circumferential direction except for the vicinity of the handle 13. The engagement recess 32a is used for engagement with an engagement projection 32b provided on the lower part 20b described later.

On the other hand, the lower part 20b shown in FIGS. 4 and 5 is an annular member having an inner diameter slightly larger than the outer diameter of the flange portion 8 of the outer container 3. On the inner diameter side of the lower end of the lower part 20b, a contact part 14 that comes into contact with the flange part 8 is provided over the entire circumference of the lower part 20b. On the inner diameter side of the upper end of the lower part 20b, an engagement convex part 32b is provided over the entire periphery except for a part located near the handle part 13 at the time of coupling with the upper part 20a.

The upper part 20a and the lower part 20b can be connected to each other via an engaging concave part 32a and an engaging convex part 32b, and as shown in FIG.
Is sandwiched from above and below. Then, the upper part 20a and the lower part 20b are welded to each other at the shoulder member welding parts 21a and 21b in a state where pressure is applied from above and below the flange part 8 while sandwiching the flange part 8. And the plug body attaching part 1 of the upper part 20a
A screw-in type plug 15 is fitted into 2. As a material of the upper part 20a and the lower part 20b,
It is preferable to select from synthetic resins such as polypropylene, polycarbonate, polyacetal, ABS, and compounds thereof in consideration of heat resistance, moldability, impact resistance, and the like. As shown in FIG. 6, the plug 15 includes a plug upper portion 51 and a plug lower portion 52, and the plug lower portion 52 has a threaded portion 54.
Is provided, and is screwed with a plug screwing portion 34 provided on the plug mounting portion 12 of the shoulder member 20. A packing 53 is attached to the lower side of the screw portion 54 to enhance the tightness of the double-walled container 25 when the stopper 15 is attached to the stopper attaching portion 12. The material of the plug 15 is not particularly limited, but a synthetic resin or the like can be suitably used.

As a material of the inner container 2 and the outer container 3 constituting the double-walled container 25, a synthetic resin can be used. The synthetic resin may be selected at any time according to the performance and use conditions required for the heat insulating container. For example, when a high-temperature liquid or the like is charged and kept for a long time, the synthetic resin used for the inner container 2 and the outer container 3 has a gas barrier property,
Select a synthetic resin such as polyketone, aromatic polyamide, cycloolefin, etc., which is excellent in hot water resistance, etc.
To produce

As the heat insulating medium, the thermal conductivity of air (κ =
2.41 × 10^-2W ・ m^-1・ K^-1; 0 ° C)
Krypton having thermal conductivity (κ = 0.87 × 10^-2W
・ M ^-1・ K^-1; 0 ° C.), xenon (κ = 0.52 × 10
^-2W ・ m^-1・ K^-1; 0 ° C), and argon (κ = 1.6).
3 × 10^-2W ・ m^-1・ K^-10 ° C) etc.
Low thermal conductivity of one type or a mixture of them
Using a gas, this is filled into the space 4 at room temperature and almost at atmospheric pressure.
Fill. Further, a radiant heat prevention film 5 is formed on the outer surface 2b of the inner container 2.
As long as copper foil or aluminum foil
Insulated containers that can be warmed can be manufactured.

In order to make the contents and the amount of the contents in the heat insulating container visible, the synthetic resin itself is transparent, has a gas barrier property, and has a hot water resistant methyl methacrylate resin. , Polyethylene naphthalate resin,
Polyacrylonitrile resin can be used. The space 4 is filled with the above-described low thermal conductivity gas as a heat medium. In addition, by using a film having high infrared reflectance and transmitting visible light as the radiant heat prevention film 5, a heat insulating container in which the contents and the amount thereof can be visually confirmed can be manufactured. As this film, a film obtained by depositing or sputtering metal on the film can be suitably used.

On the other hand, when a high-temperature liquid or the like is charged and the temperature is kept for only a short time, a synthetic resin having a gas barrier property is used by using air as it is instead of the expensive low thermal conductivity gas in the cavity 4. It is not necessary to do so, and an inexpensive heat insulating container can be manufactured using a synthetic resin having only hot water resistance. When a low thermal conductivity gas is used, it is necessary to bond the ventilation holes 6 with a sealing plate 7, but an adhesive is appropriately selected according to the material of the synthetic resin used for the outer container 3, What is necessary is just to seal.

Next, the heat insulating container 1 constructed as described above
A method of manufacturing the device will be described. First, the inner container 2 and the outer container 3 made of synthetic resin are molded. Next, a radiant heat prevention film 5 is provided on the outer wall surface 2b of the inner container 2.
After the formation of the radiant heat prevention film 5, the inner container 2 is housed in the outer container 3, and the inner container 2 and the outer container 3 are welded to each other at the ends 2a and 3a by a vibration welding machine or the like. Prior to welding, a heat insulating material may be provided in advance in a portion to be the gap 4. In the case of a heat insulating container of the type that performs gas heat insulation, the air in the gap 4 is evacuated through an air hole 6 by an evacuation means such as a vacuum evacuation pump, and a gas having a lower thermal conductivity than air is evacuated. Fill inside. After filling the space 4 with the gas, the ventilation holes 6 are quickly filled with the sealing plate 7 using an adhesive.
Seal with. In order to fill the gap 4 with air, the next step may be performed without filling the air.

After the double-walled container 25 is completed as described above, the shoulder member 20 is attached to the opening 40 of the double-walled container 25. First, the lower part 20b of the shoulder member 20 is fitted from the bottom side of the double-walled container 25, and the flange portion 8 of the double-walled container 25 is brought into contact with the contact portion 14 of the lower part 20b. Next, the upper part 20a of the shoulder member 20 is joined to the lower part 20b so as to sandwich the flange 8 from the opening 40 side of the double-walled container 25. The connection between the upper portion 20a and the lower portion 20b is performed by forcibly fitting the engagement projection 32b into the engagement recess 32a. Next, upper part 2
The upper part 20a and the lower part 20b are integrated by thermally welding shoulder member welding parts 21a and 21b formed by connecting the lower part 20a and the lower part 20b. As described above, the heat insulating container 1 is manufactured.

In the heat insulating container 1, a shoulder member 20 made of synthetic resin sandwiches the flange portion 8 of the double-walled container 25 from above and below, and surrounds and fixes the flange portion 8. Therefore, it is possible to protect the flange portion 8 from external impact. Further, in the method of manufacturing the heat insulating container 1, the shoulder member 20 is fixed to the double-walled container 25 by forcibly fitting the upper part 20a and the lower part 20b into the engaging recesses 32a,
Attachment to the double-walled container 25 is very simple because the connection is made at 32b.

In the above, the configuration and manufacturing method of the insulated container 1 for accommodating a liquid beverage or a solid or semi-solid food have been described in detail as an example. Of course, it is also possible to change the shape of the shoulder member as appropriate to make it suitable for other uses. For example, a cooler box, an ice box, an insulated cup, an insulated tableware, an insulated lunch box and the like can be mentioned.

[0020]

(Embodiment 1) FIG. 1 shows an example of a heat insulating container of the present invention. The insulated container 1 includes an inner container 2 and an outer container 3.
A double-walled container 25 which is housed with a gap 4 therebetween, is integrally formed, and further has a low thermal conductivity gas sealed in the gap 4, and is attached to an opening 40 of the double-walled container 25. And a stopper 15 for closing the double-walled container 25. For example, double wall container 2
5, the outer diameter of the opening is about 12 cm, the outer diameter of the bottom is about 10 cm, and the height is about 20 cm.
Between the outer bottom surface 2c and the inner bottom surface 3d of the outer container 3
Approximately 5 mm. As a material of the inner container 2 and the outer container 3 constituting the double-walled container 25, since the low thermal conductivity gas is sealed in the void portion 4, the material has excellent gas barrier properties, that is, low gas permeability, and visible light. For example, krypton is sealed in the gap portion 4 using a polyethylene naphthalate resin that can transmit through.

As shown in FIG. 2, both the inner container 2 and the outer container 3 are formed in a bottomed cylindrical shape having openings 40 and 41 at one end, and the inner containers 2 and End portions 2a and 3a protruding outward from the respective cylindrical portions of the outer container 3 are formed. And double-walled container 25
The ends 2a and 3a are joined to each other by a method such as vibration welding.

As shown in FIG. 3, an outer bottom surface 3c of the outer container 3 is provided.
A circular concave portion 6a is formed substantially at the center toward the void portion 4. A vent 6 is formed at the bottom of the outer container 3 and penetrates from the recess 6a to the inner bottom surface 3d of the outer container 3 and communicates with the cavity 4. However, the formation of the recess 6a and the vent 6 This is performed when the container 3 is formed. Vent hole 6 is a gap 4
The heat insulating container 1 is provided for discharging air therein and filling a low thermal conductivity gas into the gap portion 4. The diameter of the heat insulating container 1 having the above-mentioned size is, for example, 1.0 mm.

A sealing plate 7 having substantially the same shape as the concave portion 6a and having a thickness substantially equal to the depth of the concave portion 6a is fitted into the concave portion 6a.
a. For example, a sealing plate having a diameter of 10 mm and a thickness of 1 mm is used. By matching the size of the recess 6a with the size of the sealing plate 7, when the sealing plate 7 is fitted into the recess 6a, no step is formed between the sealing plate 7 and the bottom surface 3c. The shape of the sealing plate 7 may be a polygonal shape such as a triangle or a quadrangle, in addition to a disk shape.

As a material of the sealing plate 7, for example, polycarbonate is used. In addition to polycarbonate, a hygroscopic resin such as polyamide and ABS may be used.
Since these resins have a hygroscopic property, a cyanoacrylate-based adhesive which is a moisture-curable adhesive 7a is used for bonding the sealing plate 7.

On the outer surface 2b of the inner container 2, for example, a radiant heat prevention film 5 having a property of reflecting infrared rays and transmitting visible light is provided.
Affix. As the radiation heat prevention film 5, a film or the like sold by Mitsui Chemicals, Inc. under the name of a heat mirror film is used. This is a film in which an ITO or Ag layer is formed on a polyethylene terephthalate resin, and has a visible light transmittance of about 45 to 80% and an infrared reflectance of about 75 to 90%. .

As shown in FIG. 1, a shoulder member 20 composed of an upper part 20a and a lower part 20b shown in FIGS. The shoulder member 20 connects the flange portion 8 of the double-walled container 25 to the upper part 2.
It is fixed to the double-walled container 25 by being sandwiched between upper and lower parts 0a and the lower part 20b and forcibly fitted.
The shoulder member 20 is provided at the shoulder member welding portions 21a and 21b.
The upper part 20a and the lower part 20b are welded to each other. A screw-in type plug 15 is fitted in the plug mounting portion 12 of the upper part 20a. As a material of the upper part 20a and the lower part 20b, for example, a polypropylene resin is used in consideration of heat resistance, moldability, impact resistance, and the like.

(Embodiment 2) This embodiment is the same in size and shape as in Embodiment 1 above, and is equivalent to that shown in FIGS. I do. Hereinafter, points different from the first embodiment will be described.

In the heat insulating container 1 of this embodiment, for example, polycarbonate is used as the material of the outer container 3 and the inner container 2 to form an air heat insulating container. Therefore, the outer container 3 has the recess 6
Neither a nor the ventilation hole 6 need be formed, and sealing with the sealing plate 7 is not necessary. As the radiant heat prevention film 5, for example, an aluminum foil is provided on the outer surface 2 b of the inner container 2 or the like. Of course, films can also be used. The manufacturing of the heat insulating container of the present embodiment is performed in accordance with the method of manufacturing the heat insulating container of Embodiment 1, and the shoulder member 20 can be attached to the double-walled container 25.

[0029]

As described above, in the heat insulating container of the present invention, since the flange portion, which is the welded portion between the inner container and the outer container, is sandwiched from above and below, the mechanical strength of the welded portion of the double-walled container is obtained. To protect the double-walled container. Further, in the heat insulating container of the present invention, the shoulder member composed of the upper part and the lower part is fixed to the double-walled container by using the respective engaging portions, and the connection between the double-walled container and the shoulder member is performed. Can be performed without using screws or the like, so that the assembling of the heat insulating container is simple.
In addition, by changing the resin and color of the upper part and the lower part, not only the design can be improved, but also the fitting condition can be confirmed more reliably.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of an example of a heat insulating container of the present invention.

FIG. 2 is a longitudinal sectional view showing a double-walled container.

FIG. 3 is a longitudinal sectional view showing a sealing plate and a vent at the bottom of the outer container.

FIG. 4 is a longitudinal sectional view showing a shoulder member.

FIG. 5 is a perspective view showing a shoulder member.

FIG. 6 is a longitudinal sectional view showing a plug.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Heat insulation container, 2 ... Inner container, 2a ... End of inner container, 3 ... Outer container, 3a ... End of outer container, 4
... Void part, 8 ... Flange part, 20a ... Upper part, 20b ... Lower part, 21a, 21b ...
-Shoulder member welding part, 25 ... Double wall container, 40 ... Opening of inner container and double wall container, 41 ... Opening of outer container.

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[Procedure amendment]

[Submission date] January 31, 2000 (200.1.3
1)

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Claims

[Correction method] Change

[Correction contents]

[Claims]

[Procedure amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0005

[Correction method] Change

[Correction contents]

[0005]

To solve the above problems and achieve the object of the present invention, the present invention is configured as follows. That is, the present invention provides a double-walled container in which an inner container is accommodated in an outer container with a gap therebetween, and these are integrally formed, and a shoulder member attached to an opening of the double-walled container. An end protruding outward from the outer surface of the inner container is formed at the opening of the inner container, and an end protruding outward from the outer surface of the outer container at the opening of the outer container. A part is formed, the ends form a flange part which is fusion-bonded, the shoulder member comprises an upper part and a lower part, an engagement recess is formed in the upper part, and the lower part has
Engagement projections that fit into the engagement recesses are formed.
Part and lower part sandwich the flange from above and below
In this state, the engaging convex part is forcibly fitted into the engaging concave part.
It is characterized by being connected to each other by being made to work. Further, in the heat insulating container of the present invention, the upper part and the lower part are formed with shoulder member welds that are in contact with each other when the upper part and the lower part are fitted, and the shoulder member welds are welded to each other. Is desirable.

[Procedure amendment 3]

[Document name to be amended] Statement

[Correction target item name] 0006

[Correction method] Change

[Correction contents]

Further, in the method of manufacturing the heat insulating container, the inner container is accommodated in the outer container with a gap therebetween, and a double-walled container is formed by integrating the inner container and the inner container is formed in the opening of the inner container. An end protruding outward from the outer surface and an opening protruding outward from the outer surface of the outer container at the opening of the outer container are formed by melting and joining a flange portion, and a shoulder member is formed. The upper part and the lower part which constitute are combined with each other in a state where the flange is sandwiched from above and below .

 ────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Shuo Matsuda 1-16-7 Nishishinbashi, Minato-ku, Tokyo F-term in Nippon Oxide Co., Ltd. 4B002 AA01 AA21 BA01 BA08 BA23 BA41 CA02 CA31 CA43

Claims (4)

[Claims] 1. A double-walled container in which an inner container is accommodated in an outer container with a gap therebetween, and these are integrally formed;
A shoulder member attached to an opening of the double-walled container, an end of the inner container protruding outward from an outer surface of the inner container, and an opening of the outer container; An end protruding outward from the outer surface of the outer container is formed, the ends forming a flange portion which is fusion-bonded, and the shoulder member comprises an upper part and a lower part; A heat insulating container, characterized in that parts and the lower part are connected with the flange part interposed therebetween. 2. The heat insulating container according to claim 1, wherein the upper part and the lower part are joined together by forcible fitting. 3. The method according to claim 2, wherein the upper part and the lower part include:
3. The heat insulating container according to claim 1, wherein shoulder members welded to each other when the upper part and the lower part are fitted are formed, and the shoulder member welds are welded to each other. 4. An inner container is accommodated in an outer container with a gap therebetween, and a double-wall container is formed by integrating the inner container and the outer container is formed at an opening of the inner container from an outer surface of the inner container to an outer side. An upper part and a lower part forming a flange portion by melting and joining an end protruding from the outer container and an end protruding outward from an outer surface of the outer container to an opening of the outer container. A method for manufacturing a heat-insulating container, characterized in that parts are joined to each other while sandwiching the flange portion.