TWI806449B - Insulated container and manufacturing method thereof - Google Patents

Abstract

The present invention relates to a heat-insulating container and its manufacturing method. When the exhaust slot is sealed by welding, the welding marks are not obvious. The heat-insulating container has an outer container and an inner container made of metal with an opening at one end. , and with the inner container stored inside the outer container, the open ends of the outer container and the inner container are joined to each other, so that a vacuum insulation layer is provided between the outer container and the inner container, and the heat insulation The container is provided with at least one weld trace portion formed by welding and sealing a slot for exhausting air on the bottom surface of the outer container, and the weld trace portion is formed along a bottom surface of the outer container. The contour of the concave portion is set at a position close to the foregoing contour.

Description

Insulated container and manufacturing method thereof

The present invention relates to a thermal insulation container and its manufacturing method.

Conventionally, a heat-insulating container is known, which has a metal outer container and an inner container with an opening at one end, and the opening ends of the inner container are joined to each other in a state that the inner container is accommodated inside the outer container, and the outer container and the inner container are connected to each other. Equipped with vacuum insulation. Such insulated containers are widely used in beverage containers, such as water bottles and cups with heat and cold functions, as well as food containers and cookware with heat preservation functions (eg, US Patent Application Publication No. 2019/0231145).

In the above-mentioned conventional heat-insulating container, the open ends of the outer container and the inner container are butted with each other, and the butt joints are welded together. In addition, a vacuum insulating layer is formed between the outer container and the inner container by sealing the exhaust hole portion at the bottom of the outer container with a waxy material in a decompression (vacuum) chamber.

On the other hand, the prior art proposes a method of forming a vacuum insulation layer by welding under reduced pressure to seal the slit for exhaust gas on the outer container.

Since the slots are sealed by welding, the weld traces can make them unsightly. On the other hand, if the width or length of the slot is reduced so that the weld traces are less noticeable, the exhaust air through the slits will be unsightly. The time required will increase and the manufacturing efficiency will decrease. Therefore, the present invention is made in view of the above-mentioned conventional situation, and the purpose is to provide a heat insulating container and a manufacturing method thereof, which can make the welding marks less obvious when sealing the exhaust slot by welding.

A first object of the present invention is to provide a heat-insulating container which has an outer container and an inner container made of metal having an opening at one end, and the inner container is stored inside the outer container. The open ends of the outer container and the inner container are joined to each other to provide a vacuum insulation layer between the outer container and the inner container, and the heat insulating container is provided with at least one weld trace portion, which is sealed by welding A slit for exhausting gas is formed on the bottom surface of the outer container, and the welding mark is arranged along the contour of a concave portion on the bottom surface of the outer container or near the aforementioned contour.

Optionally, the welding mark portion is arranged along the outer peripheral side of the level difference portion forming the contour of the concave portion.

Optionally, the recess is arranged in a ring shape on the bottom surface of the outer container, and the welding mark is arranged along the inner peripheral side of the step portion forming the contour of the inner side of the recess.

Optionally, the heat-insulating container can have a plurality of weld traces, and the weld traces are arranged along or near the contour of the recess.

A second object of the present invention is to provide a heat-insulating container, which has an outer container and an inner container made of metal with an opening at one end, and the outer container is kept in a state where the inner container is accommodated inside the outer container. The open ends of the container and the inner container are joined to each other so that a vacuum insulation layer is provided between the outer container and the inner container, and the heat insulating container is provided with at least one weld trace portion which is sealed by welding It is formed by a slot for exhausting the outer container, and the weld marks are arranged along the outline of a pattern formed by characters, numbers, symbols, graphics or a combination thereof.

A third object of the present invention is to provide a heat-insulating container, which has an outer container and an inner container made of metal with an opening at one end, and with the inner container housed inside the outer container, the outer container The open ends of the container and the inner container are joined to each other so that a vacuum insulation layer is provided between the outer container and the inner container, and the heat insulating container is provided with at least one weld trace portion which is sealed by welding A slot for exhausting the outer container is formed, and the welding mark is covered by a covering member.

Optionally, the outer container and the inner container are made of titanium, aluminum, magnesium or alloys thereof.

A fourth object of the present invention is to provide a method of manufacturing a heat-insulating container, wherein a heat-insulating container has an outer container and an inner container made of metal with an opening at one end, and the inner container is accommodated inside the outer container. state, the open ends of the outer container and the inner container are joined to each other, so that a vacuum insulation layer is provided between the outer container and the inner container, and the manufacturing method of the heat insulating container includes forming a row A slot for gas; and under reduced pressure, the slot is sealed by welding, the slot is located along or near the outline of a recess formed in the bottom surface of the outer container.

Optionally, the slit is formed along the outer peripheral side of the step portion forming the outline of the concave portion.

Optionally, the annular recess is formed on the bottom surface of the outer container, and the slot is formed along the inner peripheral side of the step portion forming the inner contour of the recess.

Optionally, a plurality of slots are provided along the contour of the concave portion or near the contour.

A fifth object of the present invention is to provide a method of manufacturing a heat-insulating container, wherein a heat-insulating container has an outer metal container having an opening at one end and an inner container, and the inner container is accommodated inside the outer container. In some cases, the open ends of the outer container and the inner container are joined to each other, and a vacuum insulation layer is provided between the outer container and the inner container. A slot for gas; and under reduced pressure, the slot is sealed by welding, and the slot is arranged along the outline of a pattern formed by letters, numbers, symbols, figures or combinations thereof.

Optionally, the slot is sealed by means of laser welding.

Optionally, the outer container and the inner container are made of titanium, aluminum, magnesium or alloys thereof.

As described above, the present invention can provide a thermally insulated container and a method of manufacturing the same, by which when the slot for exhaust gas is sealed by welding, the weld marks are less conspicuous.

In order to facilitate your review committee to further understand and understand the purpose, technical features and effects of the present invention, the embodiments are hereby combined with the drawings, and the details are as follows:

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

(first embodiment)

First, a first embodiment of the present invention, such as a heat insulating container 1A shown in FIGS. 1 to 5, and its manufacturing method will be described.

Fig. 1 is a perspective view of the heat insulating container 1A of the first embodiment of the present invention viewed from the upper side; Fig. 2 is a perspective view of the heat insulating container 1A shown in Fig. 1 viewed from the lower side; Fig. 3 is a perspective view of the heat insulating container 1A shown in Fig. 1 Bottom view of the structure; FIG. 4 is a cross-sectional view of the structure of the heat-insulating container 1A shown in FIG. 1; FIG. 5 is an enlarged cross-sectional view showing the bottom side of the heat-insulating container 1A shown in FIG.

The heat insulating container 1A of this embodiment has a metal outer container 2 with an opening at one end and an inner container 3 as shown in FIGS. Open end sides of the outer container 2 and the inner container 3 are joined to each other, and a vacuum insulation layer 4 is provided between the outer container 2 and the inner container 3 .

In this embodiment, the opening ends of the outer container 2 and the inner container 3 are joined by welding while they are butted against each other. In addition, in Fig. 4, although the butt joint portion (boundary) of the outer container 2 and the inner container 3 is not shown, since the welded portion is melted by welding, weld beads are formed on the entire circumference of the butt joint portion after welding. In addition, the smooth surface can be completed by subjecting the beads to grinding and polishing after welding.

The material used to make the outer container 2 and the inner container 3, in addition to the commonly used stainless steel, can also use metals such as titanium, aluminum, magnesium or their alloys. In addition, a common welding method such as laser welding can be used for joining processing of the outer container 2 and the inner container 3 .

By having the vacuum heat insulation structure as described above, the heat insulation container 1A of this embodiment can be given the function of keeping warm or cold. Also, in the heat-insulated container 1A, the outer container 2 and the inner container 3 are always in a state where the difference between the internal pressure (vacuum pressure) and the external pressure (atmospheric pressure) is applied, and the number of the outer container 2 and the inner container 3 can be increased. 3 mechanical strength. Thereby, even if the sheet metal thickness of the outer container 2 and the inner container 3 is very thin, the rigidity of the heat insulating container 1A can be improved, and the weight of the heat insulating container 1A can be reduced.

The heat insulating container 1A of this embodiment can be a container body with a cover, and the upper opening of the heat insulating container 1A can be opened and closed by a cover (not shown) that can be screwed on and removed from the heat insulating container 1A.

Although the heat-insulating container 1A of this embodiment has an overall bottomed and substantially cylindrical appearance, the present invention does not specifically limit the appearance of the heat-insulating container 1A according to the required size or design. In addition, painting or printing may be applied to the outer surface of the outer container 2 .

In particular, in the heat-insulating container 1A of this embodiment, a slot S for exhaust gas is formed on the bottom surface of the outer container 2, and the slot S is welded and sealed under a decompressed state, whereby the outer container 2 and the outer container 2 are sealed. A vacuum insulation layer 4 is formed between the inner containers 3 .

The slit S can be formed by, for example, irradiating laser light. In addition, the slot S may be sealed by welding such as laser welding.

The width of the slot S is preferably 0.02mm~1.0mm, preferably 0.05mm~0.2mm. Also, the width of the slit S is preferably not more than 80% of the thickness of the base plate of the outer container 2, preferably not more than 30% of the thickness of the base plate. On the other hand, if the width of the slit S exceeds 80% of the outer container 2, not only will the time for sealing the slit S be too long, but it may also be impossible to seal the slit S because only the base material of the outer container 2 is melted, so There is also a need for sealing materials such as welding rods.

However, although the slot S is not shown in FIGS. 2 to 4 , welding beads will be formed along the slot S after the slot S is sealed by welding. In addition, the bead may be ground or polished after welding to achieve a smooth surface.

Therefore, in the heat-insulating container 1A of the present embodiment, there is a weld trace portion formed by the slit S for welding and sealing exhaust on the bottom surface of the outer container 2 . In this specification, although the welding mark part is not shown in figure, it is formed in the same position as the slit S. As shown in FIG.

The heat-insulating container 1A of this embodiment forms a slit S along the contour of the recess 5 provided on the bottom surface of the outer container 2 or in the vicinity of the contour. In order to make the welding marks less obvious.

Specifically, this heat insulating container 1A has a concave portion 5 that is depressed in a circular shape in plan view at the center of the bottom surface of the outer container 2 . The slit S is provided along the contour of the concave portion 5 or near the contour, so the welding mark is formed along the contour of the concave portion 5 or near the contour.

Thereby, when the heat insulating container 1A of this embodiment seals the exhaust slit S by welding, the weld traces can be made inconspicuous by making the weld traces follow the contour of the recess 5 or the vicinity thereof. In addition, since the concave portion 5 is provided at the center of the bottom surface of the outer container 2, compared with the outer edge of the bottom surface of the outer container 2, which is more likely to be collided when the heat-insulated container 1A is dropped, the risk of damage such as deformation of the welded portion caused by the impact of the drop can be avoided. .

In the heat insulating container 1A of this embodiment, a plurality of (two in this embodiment) slits S may be provided along the contour of the concave portion 5 or near the contour. The two slits S are respectively arranged on the contour of the recess 5 or at positions opposite to the contour near the contour.

In the heat insulating container 1A of this embodiment, by providing such a plurality of slits S, it is possible to shorten the time required for exhausting air through the slits S when forming the vacuum heat insulating layer 4 . Also, compared to the case where a single large slit S is provided, the weld mark portion formed after sealing the slit S by welding can be made less conspicuous. However, it is not necessary to provide a plurality of slits S, and only one slit S may be provided according to circumstances.

Also, regarding the length of the slot S, if the slot S is arranged in an arc shape along the outline of the circular recess 5 provided on the bottom surface of the outer container 2 or near the outline as described above, the length of the slot S will vary according to The radius of the corresponding recess 5 varies, but the angle range corresponding to its length is preferably less than 180° (half circle), and preferably less than 90° (1/4 circle).

When the angular range of the arc-shaped slit S exceeds 180° (half circle), the inner part (the inner part of the recess 5) on the bottom surface of the outer container 2 via the slit S will be separated from the outer part (the outer part of the recess 5). However, it deviates toward the thickness direction of the base material, which makes it difficult to seal the slit S in the next process.

Also, in the heat insulating container 1A of this embodiment, the slit S may be provided along the outer peripheral side of the stepped portion 6 forming the outline of the concave portion 5 .

As shown enlargedly in Figure 5, the step difference part 6 is the part connecting the bottom surface of the outer container 2 and the bottom surface of the concave part 5, and the outer peripheral side of the step difference part 6 is bent into a convex shape at the connection part 6a with the bottom surface of the outer container 2, and the step difference part 6 The inner peripheral side of the outer container 2 is bent into a concave shape at the connection portion 6b of the bottom surface of the outer container 2, and the slot S is provided along the connection portion 6a of the outer peripheral side of the step portion 6.

Since the above-mentioned tension applied to the outer container 2 causes little deformation to the step portion 6 , the step portion 6 is suitable for providing the slit S. Furthermore, the outer peripheral side of the step portion 6 is easier to perform grinding or polishing after welding than the inner peripheral side of the step portion 6 .

On the other hand, since the bottom surface of the outer container 2 is not in direct contact with the loading surface on the inner peripheral side of the step portion 6, the risk of damage is relatively small. Depending on the situation, the inner peripheral side of the step portion 6 can also be connected along the connecting portion of the step portion 6. 6b Set the slot S.

When forming the slit S, the heat insulating container 1A is rotated around the central axis, and laser light is irradiated along the contour of the recess 5 provided on the bottom surface of the outer container 2 or near the contour. Thereby, the slit S can be precisely formed on the contour of the recessed portion 5 or in the vicinity of the contour.

Also, when sealing the slot S, the heat-insulated container 1A before sealing is stored in a depressurized (vacuum suction) chamber, and the space between the outer container 2 and the inner container 3 is exhausted through the slot S. In this state, the heat insulating container 1A in the chamber is irradiated with laser light through the window portion provided in the chamber.

At this time, laser light is irradiated along the slit S provided on the bottom surface of the outer container 2 while the heat insulating container 1A is rotated around the central axis. Thereby, the slot S can be precisely sealed along the contour of the recess 5 or in the vicinity of this contour.

However, the formation and sealing of the slit S may be performed by moving the heat insulating container 1A to the fixed laser light irradiation position, or by scanning and moving the laser light on the fixed heat insulating container 1A.

It should be noted that in the prior art, in the decompressed (vacuum suction) chamber, the method of sealing the exhaust holes provided on the bottom surface of the outer container with a wax sealing material needs to melt the wax sealing material. It is therefore necessary to heat the insulated container.

For example, when pure titanium, which is lighter than stainless steel, is used to make the outer container and inner container, the wax sealing material suitable for pure titanium must be heated to about 800°C to melt it. In this case, annealing will reduce the mechanical strength of the outer container and inner container, so it is difficult to maintain the same mechanical strength as stainless steel with the same thickness.

Therefore, compared with the case of using stainless steel in the conventional sealing method, the thickness of the outer container and the inner container must be thickened to ensure the mechanical strength of the outer container and the inner container.

Compared with the above-mentioned conventional technology, the manufacturing method of the heat-insulating container 1A of this embodiment does not need to heat the heat-insulating container 1A when sealing the above-mentioned slit S, and does not require annealing when the outer container 2 and the inner container 3 are made of pure titanium. . Therefore, the thickness of the outer container 2 and the inner container 3 can be reduced. In addition, electric power and time required for heating the heat insulating container 1A are unnecessary.

As described above, in the heat insulating container 1A of this embodiment, when the slit S for exhaust gas is sealed by welding and sealing, the welding marks can be made inconspicuous.

In addition, although the above-mentioned heat insulating container 1A is configured by providing the circular concave portion 5 in the center of the bottom surface of the outer container 2 as described above, the shape of the concave portion 5 is not limited to this. For example, as shown in FIG. 6 , a concave portion 5A depressed in an oblong shape in plan view may be provided at the center of the bottom surface of the outer container 2 .

At this time, the slit S is formed along the outline of the recessed portion 5A or its vicinity and is sealed by welding. In particular, in the concave portion 5A, a slit S is formed between both ends of the elongated straight portion, and the slit S is sealed by welding, so that the weld marks are less conspicuous.

(second embodiment)

Next, a heat insulating container 1B according to a second embodiment of the present invention as shown in FIGS. 7 to 10 and its manufacturing method will be described.

Among them, Fig. 7 is a perspective view of the heat insulating container 1B of the second embodiment of the present invention viewed from the lower side; Fig. 8 is a bottom view of the structure of the heat insulating container 1B shown in Fig. 7; Fig. 9 is a view of the heat insulating container 1B shown in Fig. 7 A sectional view of the structure; FIG. 10 is an enlarged sectional view showing the bottom side of the heat insulating container 1B shown in FIG. 7 . In addition, in the following description, description of the same part as this heat insulating container 1A is abbreviate|omitted, and the same code|symbol is attached|subjected in drawing.

The heat-insulating container 1B of this embodiment, as shown in FIGS. 7 to 9 , has a concave portion 5B in which the center of the bottom surface of the outer container 2 is depressed into an annular shape, and a convex portion 7 located inside the concave portion 5B that is circular in plan view.

In the heat-insulating container 1B of this embodiment, the slit S is provided along the contour of the concave portion 5B or in the vicinity of the contour so that the welding mark is not conspicuous. Therefore, the welding mark portion is formed along the outline of the recessed portion 5B or the vicinity of the outline.

Thus, in the case of the heat-insulating container 1B of this embodiment, when the slit S for exhaust gas is sealed by welding, since the weld trace portion follows the contour of the concave portion 5B or the vicinity of the contour, the weld trace portion becomes not eye-catching. In addition, since the concave portion 5B is provided at the center of the bottom surface of the outer container 2, compared with the outer edge of the bottom surface of the outer container 2, which is easy to collide when the heat-insulating container 1B is dropped, the risk of damage such as deformation of the welded portion caused by the impact of the drop can be avoided.

The heat insulating container 1B of this embodiment includes a plurality of (two in this embodiment) slits S, and the plurality of slits S are provided along the contour of the recess 5B or in the vicinity of the contour. The two slits S are provided at mutually symmetrical positions on the contour of the recess 5B or in the vicinity of the contour.

In the heat insulating container 1B of the present embodiment, by providing the plurality of slits S as described above, the time required for exhausting air through the plurality of slits S can be shortened when forming the vacuum insulation layer 4 . In addition, compared with providing a single large slit S, the weld trace portion after sealing the slit S by welding can be made less conspicuous. However, it is not necessary to provide multiple slots S, and only one slot S may be provided according to the actual situation.

In the heat insulating container 1B of this embodiment, the slit S is provided along the inner peripheral side of the step portion 61 forming the inner contour of the concave portion 5B.

As shown enlargedly in Figure 10 , the level difference portion 61 is the part connecting the bottom surface of the convex portion 7 and the concave portion 5B. The outer peripheral side of the step portion 61 is curved in a concave shape at the connection portion 6d with the bottom surface of the concave portion 5B, and the slit S is provided along the connection portion 6c of the inner peripheral side of the step portion 61 .

Since the above-mentioned tension applied to the outer container 2 causes little deformation to the step portion 61 , the step portion 61 is suitable for providing the slit S. Furthermore, the inner peripheral side of the step portion 61 is easier to perform grinding or polishing after welding than the outer peripheral side of the step portion 61 .

On the other hand, the outer peripheral side of the step portion 61 is not in direct contact with the loading surface on the bottom surface of the outer container 2, so the risk of damage is small, and it can also be arranged along the connecting portion 6d on the outer peripheral side of the step portion 61 according to different situations. Slot S.

When the slit S is formed, the heat-insulating container 1B is rotated around the central axis, and laser light is irradiated along the contour of the concave portion 5B provided on the bottom surface of the outer container 2 or near the contour. Thereby, the slit S can be precisely formed on the contour of the recessed portion 5B or in the vicinity of the contour.

Also, when sealing the slot S, the heat-insulated container 1B before sealing is accommodated in a depressurized (vacuum suction) chamber, and the space between the outer container 2 and the inner container 3 is exhausted through the slot S. In this state, the heat insulating container 1B in the chamber is irradiated with laser light through the window portion provided in the chamber.

At this time, laser light is irradiated along the slit S provided on the bottom surface of the outer container 2 while the heat insulating container 1B is rotated around the central axis. Thereby, the slit S can be accurately sealed along the contour of the recess 5B or in the vicinity of the contour.

The manufacturing method of the heat-insulating container 1B of this embodiment does not require heating of the heat-insulating container 1B when sealing the above-mentioned slit S, and does not require annealing when the outer container 2 and the inner container 3 are made of pure titanium. Therefore, the thickness of the outer container 2 and the inner container 3 can be reduced. In addition, electric power and time required for heating the heat insulating container 1B are unnecessary.

As described above, in the heat insulating container 1B of this embodiment, when the slit S for exhaust gas is sealed by welding, it is possible to make the welding marks less conspicuous.

However, this heat-insulating container 1B is constructed so that the slit S is provided along the inner peripheral side of the above-mentioned step portion 61 forming the inner contour of the recessed portion 5B, but similarly to the heat-insulating container 1A, it may also be formed along the outer contour of the recessed portion 5B. A slit S is provided on the outer peripheral side of the step portion 62 .

Also, in a general manufacturing process, after the slit S is provided on any one of the above-mentioned step portion 61 or step portion 62 , the slit S is sealed by welding. However, when a failure occurs at the welded joint, resulting in the inability to properly vent the air between the outer container 2 and the inner container 3, it is physically difficult to re-arrange the slot S at the same welded joint and seal the slot S by welding. , In this way, defective products will be discarded as defective products, which will lead to a decrease in production efficiency.

Therefore, when a defect occurs at a weld, it is preferable to provide a slit S in the other of the step portion 61 or the step portion 62 and seal the slit S by welding. Thereby, there is no need to provide a weld at the same place again, and therefore, the product does not need to be discarded as a defective product, and a decrease in production efficiency can be prevented.

In addition, among the above-mentioned step portions 61 and 62, when the height of the inner step portion 61 (convex portion 7) is lower than that of the outer step portion 62 (bottom surface of the outer container 2), it is preferable to follow the height of the inner step portion 61. Set the slot S. At this time, since the outer step portion 62 (the bottom surface of the outer container 2 ) is in contact with the installation surface, but the inner step portion 61 (convex portion 7 ) is not in contact with the installation surface, it is possible to avoid deformation of the welded portion due to contact with the installation surface. risk of damage.

Therefore, the above-mentioned heat insulating container 1B is configured such that the annular recess 5B is provided in the center of the bottom surface of the outer container 2 as described above, and the convex portion 7 is provided inside it, but a circular recess ( Not shown) to replace the convex portion 7.

(third embodiment)

Next, a heat insulating container 1C according to a third embodiment of the present invention as shown in Fig. 11 and Fig. 12 and its manufacturing method will be described.

Among them, Fig. 11 is a perspective view of the heat insulating container 1C according to the third embodiment of the present invention viewed from the lower side; Fig. 12 is a bottom view of the structure of the heat insulating container 1C shown in Fig. 11 . In addition, in the following description, description of the same part as this heat insulating container 1A is abbreviate|omitted, and the same code|symbol is attached|subjected in drawing.

The heat insulating container 1C of the present embodiment, as shown in Fig. 11 and Fig. 12, has a pattern F arranged on the bottom surface of the outer container 2, and the pattern F is a combination of characters, numbers, symbols, graphics or the like.

In the heat insulating container 1C of this embodiment, the slits S are provided along the outline of the pattern F so that the weld traces are not obvious. Therefore, the weld traces are formed along the outline of the pattern F.

Thereby, in the heat-insulating container 1C of this embodiment, when the slit S for exhaust gas is sealed by welding, it is possible to make the welding marks inconspicuous. Moreover, the pattern F is provided on the bottom surface of the concave portion 5 , so compared with the outer edge portion of the bottom surface of the outer container 2 , the risk of damage caused by deformation caused by impact such as dropping can be avoided.

The heat-insulating container 1C of this embodiment can also be provided with a plurality of slots S along the outline of the pattern F. As shown in FIG. For example, two slits S are formed by dividing "R, O" of "THERMOS" and "0, 9" of "2020/92" in the pattern F. Otherwise, a slot S is formed.

In the heat insulating container 1C of this embodiment, by providing a plurality of slits S in accordance with the pattern F in this way, the time required for exhausting air through the plurality of slits S when forming the vacuum insulation layer 4 can be shortened. However, it is not necessary to provide the slits S along all the patterns F, and the slits S may be provided only along a part of the patterns F.

When the slit S is formed, the laser light is irradiated while scanning and moving along the pattern F provided on the bottom surface of the concave portion 5. The scanning movement of the laser light can adopt the method of scanning and moving the heat-insulating container 1C to the fixed irradiation position of the laser light. A method of scanning a moving laser light against a fixed heat-insulating container 1C can be used, whereby the slit S can be precisely formed along the outline of the pattern F. FIG.

Also, when sealing the slot S, the heat-insulating container 1C before sealing is accommodated in a depressurized (vacuum suction) chamber, and the space between the outer container 2 and the inner container 3 is exhausted through the slot S. In this state, the heat insulating container 1C in the chamber is irradiated with laser light through the window portion provided in the chamber.

At this time, laser light is irradiated while scanning and moving along the pattern F provided on the bottom surface of the concave portion 5 . The scanning movement of the laser light may be a method of scanning and moving the heat insulating container 1C to a fixed laser light irradiation position, or a method of scanning and moving the laser light to a fixed heat insulating container 1C. As a result, the slot S can be precisely sealed along the contour of the pattern F.

The method for manufacturing the heat-insulating container 1C of this embodiment does not require heating of the heat-insulating container 1C when sealing the above-mentioned slit S, and does not require annealing when the outer container 2 and the inner container 3 are made of pure titanium. Therefore, the thickness of the outer container 2 and the inner container 3 can be reduced. In addition, electric power and time required for heating the heat insulating container 1C are unnecessary.

In addition, for example, when labeling a lot number or a company logo on the bottom of the heat-insulating container 1C, conventionally, an additional step of laser marking or affixing a sticker with a lot number on it was required. Compared with this, in the heat-insulated container 1C of this embodiment, the pattern F can be designed in the shape of a batch number or a company logo, without the above-mentioned additional steps, thus saving costs.

As described above, in the heat-insulating container 1C of this embodiment, when the slit S for exhaust gas is sealed by welding and sealing, it is possible to make the welding marks less conspicuous.

However, the heat-insulating container 1C is provided with slits S along the pattern F provided on the bottom surface of the concave portion 5, but the pattern F is not limited to the bottom surface of the outer container 2, but may also be provided on the outer peripheral surface (side surface) of the outer container 2. At this time, by sealing the slits S provided along the pattern F with welding, the welding marks can be made inconspicuous.

(fourth embodiment)

Next, a heat insulating container 1D according to a fourth embodiment of the present invention as shown in Fig. 13 will be described.

Among them, Fig. 13 is a sectional view of the heat insulating container 1D. In addition, in the following description, description of the same part as this heat insulating container 1A is abbreviate|omitted, and the same code|symbol is attached|subjected in drawing.

In the heat-insulating container 1D of this embodiment, as shown in FIG. 13 , the above-mentioned slit S (welding marks) is provided at a position that cannot be recognized from the appearance of the outer container 2 .

Specifically, this heat-insulating container 1D has a covering member (shoulder member) 10 provided around the upper end portion (shoulder portion) of the main body portion of the outer container 2 .

The heat-insulating container 1D of the present embodiment has a weld mark portion formed by the slit S for welding and sealing exhaust, and the weld mark portion is located on the shoulder of the main body of the outer container 2 covered by the covering member 10 . Thereby, the welding trace part becomes the state covered with the covering member 10. FIG.

Therefore, in the heat insulating container 1D of this embodiment, when the slit S for exhaust gas is sealed by welding, the welding marks can be made inconspicuous (covered by the covering member 10 so that they cannot be seen).

However, the present invention is not limited to the above-described embodiments, and various changes can be added without departing from the scope of the spirit of the present invention. For example, although the above-mentioned embodiment exemplifies the application of the heat-insulating container of the present invention to the container body of the container with a lid, the present invention can also be applied to a wide range of heat-insulating containers, such as water bottles and cups with heat and cold functions. Such as beverage containers, food containers and cooking utensils with heat preservation function, etc.

According to, the above description is only a preferred embodiment of the present invention, but the scope of rights claimed by the present invention is not limited thereto. According to those who are familiar with the art, according to the technical content disclosed in the present invention, they can The easily conceivable equivalent changes shall all fall within the scope of protection of the present invention.

[knowledge] none [this invention] 1A, 1B, 1C, 1D: Insulated containers 2: outer container 3: inner container 4: Vacuum insulation layer 5, 5A, 5B: concave part 6, 61, 62: step difference department 6a, 6b, 6c, 6d: connection part 7: convex part 10: Shoulder member (covering member) F: pattern S: slot

[FIG. 1] is a perspective view of the heat insulating container of the first embodiment of the present invention viewed from the upper side; [Fig. 2] is a perspective view of the insulated container shown in Fig. 1 observed from the lower side; [Fig. 3] is a bottom view of the structure of the heat-insulated container shown in Fig. 1; [Fig. 4] is a sectional view of the structure of the insulated container shown in Fig. 1; [Fig. 5] is an enlarged sectional view showing the bottom side of the heat insulating container shown in Fig. 4; [Fig. 6] is a perspective view of another structure of the heat insulating container shown in Fig. 1 viewed from the lower side; [ Fig. 7 ] is a perspective view of the heat insulating container of the second embodiment of the present invention viewed from the lower side; [Fig. 8] is a bottom view of the structure of the heat-insulated container shown in Fig. 7; [Fig. 9] is a sectional view of the structure of the insulated container shown in Fig. 7; [FIG. 10] is an enlarged sectional view showing the bottom side of the heat insulating container shown in FIG. 7; [ Fig. 11 ] is a perspective view of the heat insulating container of the third embodiment of the present invention viewed from the lower side; [Fig. 12] is a bottom view of the structure of the heat-insulated container shown in Fig. 11; and [ Fig. 13 ] is a sectional view of a heat insulating container according to a fourth embodiment of the present invention.

1A: Insulated container

2: outer container

5: Concave

6: Step difference department

6a, 6b: connection part

S: slot

Claims (8)

A heat-insulating container comprising an outer container and an inner container made of metal with an opening at one end, and the open ends of the outer container and the inner container are joined to each other in a state where the inner container is accommodated inside the outer container , so that a vacuum heat insulation layer is provided between the outer container and the inner container, and the heat insulating container is provided with at least one welding mark part, which is used for exhausting air on the bottom surface of the outer container due to welding and sealing. Slots are formed, and the welding mark portion is arranged along the outer peripheral side of the level difference portion of the outline of a concave portion on the bottom surface of the outer container. The thermally insulated container according to claim 1, wherein the concave portion is arranged in a ring shape on the bottom surface of the outer container. The heat-insulating container according to claim 1 or 2, wherein the heat-insulating container can have a plurality of welding traces, and the welding traces are arranged along the outer peripheral side of the level difference of the contour of the concave portion. The heat-insulated container according to claim 1 or 2, wherein the outer container and the inner container are made of titanium, aluminum, magnesium or alloys thereof. A method of manufacturing a heat-insulating container, wherein a heat-insulating container has an outer container and an inner container made of metal having an opening at one end, and the outer container and the inner container are in a state in which the inner container is housed inside the outer container. The open ends of each other will be joined to each other to provide a vacuum insulation layer between the outer container and the inner container. The method of manufacturing the heat insulating container includes: forming a slot for exhaust gas on the bottom surface of the outer container; and In a decompressed state, the slot is sealed by welding, and the slot is along the outer peripheral side of the step portion of the contour of a recess provided on the bottom surface of the outer container. The method of manufacturing a heat-insulated container according to claim 5, wherein a plurality of the slits are provided along the outer peripheral side of the step portion of the contour of the concave portion. The method for manufacturing a heat-insulated container according to claim 5 or 6, wherein the slot is sealed by laser welding. The method for manufacturing a thermally insulated container according to claim 5 or 6, wherein the outer container and the inner container are made of titanium, aluminum, magnesium or alloys thereof.

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