JP6182002B2 - Manufacturing method of vacuum double container - Google Patents

Description

The present invention relates to the production how the vacuum double container.

Conventionally, there are many people who put warm soup or coffee in a vacuum double container called a portable thermos or soup mug and take it to the workplace, school, resort, etc. and eat and drink at lunch time.
In addition, there are an increasing number of stores in and around the station where you can take soups and coffee in vacuum double containers brought by customers and take them home. Some people stop by these stores and go to workplaces, schools, resorts, etc. in a thermos bottle with soup or coffee they bought.

  In recent vacuum double containers such as portable thermos bottles, for example, the temperature retention effect when hot water of 95 ± 1 ° C. is added at room temperature is maintained at a high temperature for a long time of around 80 ° C. in 6 hours. High performance products are also commercially available. Therefore, if you put soup or coffee heated to around 95 ° C in the thermos before commuting in the morning or during commuting, take it to the workplace, school, resort, etc., and eat and drink soup and coffee at 80 ° C or higher at lunch time. can do.

However, soup, coffee, and the like have an optimum eating and drinking temperature range suitable for drinking and eating, and in particular, about 70 ° C. is said to be the optimum eating and drinking temperature for coffee.
Therefore, considering the case of eating and drinking immediately in stores such as the above, food and drinks are usually sold at a temperature close to the upper limit of the optimum eating and drinking temperature range that is considerably lower than 95 ° C. Immediately after being put in, the temperature of the inner container of the vacuum double container is deprived and the temperature falls, and after 3 or 4 hours, for example, when trying to drink at lunch, the temperature is lower than when drinking at 70 ° C. There is a risk of becoming. On the other hand, if coffee with a high temperature of about 95 ° C. is added as described above, there is a problem that if it is attempted to drink immediately after going to work, it is too hot to drink.

Therefore, a portable thermos equipped with an electric heating coil as a heating means at the bottom of the inner container, and heated from the storage battery to heat the electric heating coil by heating the inner container (Patent Document 1), glass contents And a vacuum structure between the two containers, an electromagnetic induction heating layer is provided on the outer wall surface of the inner container, and an eddy current is generated in the electromagnetic induction heating layer by an electromagnetic induction device such as an IH cooker. It consists of an electromagnetic cooker (Patent Document 2) that heats the electromagnetic induction heat generating layer to heat the inner container, an outer container formed of a weak magnetic material, and an inner container formed of a ferromagnetic material. There has been proposed a vacuum double container (Patent Document 3) or the like in which an eddy current is generated in a ferromagnetic body constituting the inner container by a vessel or the like to generate heat and heat the inner container.
That is, in the vacuum double container having the above structure, the electric heating coil is energized to heat the electric heating coil, or the inner container itself is heated by electromagnetic induction without taking out the contents from the container. Can do.

Japanese Utility Model Publication No. 6-21549 Japanese Utility Model No. 1-25506 Japanese Utility Model Publication No. 6-52719

However, the vacuum double containers as described in Patent Documents 1 to 3 have the following problems.
That is, in the portable thermos of Patent Document 1, when a storage battery or the like is mounted, the thermos itself becomes large and heavy, and there is a problem that it is inconvenient to carry. There is a problem that it is difficult to manufacture because it is necessary to penetrate the outer container from the inner container side and take it out to the outside, and to devise a device for ensuring a vacuum between the inner container and the outer container.
On the other hand, in the cooking device for an electromagnetic cooker of Patent Document 2, since the inner container and the outer container are formed of glass, they are easily damaged when carried like a portable thermos, and the electromagnetic induction layer and the glass of the inner container The inner container may be damaged due to the difference in thermal shrinkage.
On the other hand, in the vacuum double container of Patent Document 3, the inner container is made of a ferromagnetic material and the outer container is made of a weak magnetic material, but it is technical to join the ferromagnetic material and the weak magnetic material. However, it is difficult and is not suitable for mass production.

The present invention is, in view of the above circumstances, in a state in which was placed the contents in the container, together with the contents can be easily heated, a manufacturing how the vacuum double container production is easy strength superior The purpose is to do.

In order to achieve the above-mentioned object, the method for manufacturing a vacuum double container according to the present invention integrates an inner container constituent member serving as an inner container and an outer container constituent member having a sealing opening at a container inlet side portion. Put double container body with sealing port in vacuum heating furnace, melt brazing material and seal the sealing port directly with brazing material, or seal the periphery of sealing plate with brazing material Before carrying out the sealing step for sealing the periphery of the mouth, a metal paste having a firing temperature not higher than the melting temperature of the brazing material is applied in advance to the outer wall surface of the inner container constituent member, and the vacuum heating furnace A manufacturing method of a vacuum double container in which the inside of the brazing material is heated to the melting temperature or higher and the metal paste is fired to form an electromagnetic induction heat generating layer at the same time. The outer container component is made of a magnetic metal material and the inner container The metal paste is made of a non-magnetic metal material that is easily weldable and a metal component, and the metal paste is a mixture of a metal paste containing metal particles having a large particle size and a metal paste containing metal particles having a small particle size. The mixed metal paste is characterized in that the firing temperature is adjusted to be equal to or lower than the melting temperature of the brazing material .

In the present invention, the nonmagnetic metal material is not particularly limited as long as it is nonmagnetic and the metal material constituting the inner container and the metal material constituting the outer container are easily weldable. The outer container is preferably formed of the same kind of metal material, and for example, nonmagnetic austenitic stainless steel can be used.
Examples of the austenitic stainless steel include SUS301, SUS302, SUS303, SUS304, SUS305, SUS316, etc. Among them, SUS304 is preferable.
In addition, in this invention, easy weldability means that it can weld by the general welding method which welds substantially the same kind of metal materials.

  The electromagnetic induction heating layer is not particularly limited.For example, a method of applying and baking a metal paste made of metal particles that generate eddy currents by electromagnetic induction on the outer wall surface of the inner container forming body serving as the inner container, A method of spraying a metal material that can generate heat by generating eddy current by electromagnetic induction. It can be obtained by a method of integration.

As described above, when a fired body of metal paste is used as the electromagnetic induction heat generating layer, the metal paste is first applied to a desired position on the outer wall surface of the inner container constituting member serving as the inner container. Although not particularly limited, for example, dipping, ink jet printing, screen printing, roll coating, spray coating, spin coating, applicator method, bar coater method, letterpress printing, intaglio printing, brush application and the like can be mentioned. Alternatively, it may be formed by applying a metal paste to a base material such as polyethylene terephthalate (PET) having releasability by the application method and then transferring the paste onto the outer wall surface of the inner container constituting member.
The electromagnetic induction heat generating layer may be provided on the entire peripheral surface of the outer wall surface of the inner container or a part of the bottom surface of the inner container as long as induction heating can be performed by at least an electromagnetic induction heating device.

Note that the gap between the electromagnetic induction heating layer and the outer container is preferably as small as possible in order to reduce the distance between the electromagnetic induction heating device and the electromagnetic induction heating layer as long as the heat insulating effect of the vacuum double container is not hindered.
The surface facing the electromagnetic induction heating device may be flat and smooth so that the eddy current is efficiently generated by the magnetic lines of force from the electromagnetic induction heating device such as an IH cooker. preferable.

In the present invention, the metal particles having a small particle diameter are preferably those having a particle diameter of 100 nm or less.

Examples of the metal particles constituting the metal paste include gold particles, silver particles, palladium particles, copper particles, nickel particles, and mixed particles thereof, and silver particles are preferable.
As a silver paste containing silver particles, commercially available ones can be used. For example, as a silver paste containing nano-order silver particles of 100 nm or less, JP 2012-52225 A (Applicant Bando Chemical Co., Ltd.) Those obtained by the method described in 1) can be used, and commercially available SW1000, SW2000, SW3000, SW4000, SR4000, SR5000 manufactured by Bando Chemical Co., Ltd. can be used.

As an electromagnetic induction heating device, a commercially available IH cooker or an electromagnetic induction heating device having an optimum structure so that the electromagnetic induction heating layer of the vacuum double container of the present invention can be induction heated most efficiently is manufactured. It doesn't matter if you do.
The brazing material is not particularly limited. For example, when the sealing port is sealed using a sealing plate and a brazing material, silver brazing is used, and when the solid brazing material is used directly as the sealing material. And low-temperature molten glass having a softening point of 200 to 600 ° C.
Examples of the low temperature molten glass include B ₂ O ₃ —PbO, B ₂ O ₃ —ZnO, PbO—B ₂ O ₃ —ZnO—SiO ₂ , and PbO—B ₂ O ₃ —Al ₂ O ₃ —SiO _2. PbO—B ₂ O ₃ —SiO ₂ type, PbO—B ₂ O ₃ —BaO—SiO ₂ type, and the like.

Liquid-like food, the electromagnetic induction heating layer by heating by the electromagnetic induction heating unit internal container liquid food product to be placed in a vacuum double container provided on the outer wall surface of the inner container of the vacuum double container of the present invention After pouring the liquid food or drink in the optimum food temperature range into a vacuum double container in a state heated in advance to a set heating temperature equal to or higher than the lower limit temperature of the optimum food temperature range, the heating element is set to a non-heated state. Liquid food and drink can be kept warm in a vacuum double container.

  Moreover, the said setting heating temperature is suitably determined by the optimal food-drinking temperature of the liquid foodstuffs put into a vacuum double container. The upper limit of the set heating temperature is not particularly limited, but if it is too high, there is a danger in putting food and drink.

  Moreover, it is although it does not specifically limit as liquid food / beverage, For example, soup, coffee, porridge, etc. are mentioned.

The manufacturing method of the vacuum double container of the present invention includes a double container main body having a sealing port in which an inner container constituent member serving as an inner container and an outer container constituent member having a sealing opening are integrated at a container inlet side portion. In a vacuum heating furnace, melt the brazing material, and seal the sealing port directly with the brazing material, or seal the periphery of the sealing port with the brazing material Before carrying out the process, a metal paste having a firing temperature equal to or lower than the melting temperature of the brazing material is applied to the outer wall surface of the inner container component in advance, and the inside of the vacuum heating furnace is set to the melting temperature of the brazing material or higher. A method for manufacturing a vacuum double container in which the metal paste is fired to form an electromagnetic induction heat generating layer at the same time as the sealing step is performed, wherein the inner container component is made of a non-magnetic metal material, The container constituent member is easily weldable with the metal material of the inner container constituent member. The metal paste is made of a non-magnetic metal material, and the metal paste is mixed with a metal paste containing metal particles having a large particle size and a metal paste containing metal particles having a small particle size, and the firing temperature is equal to or lower than the melting temperature of the brazing material. Therefore, the amount of the metal paste containing expensive small particles can be reduced, and the electric resistance of the electromagnetic induction heating element layer can be controlled by the amount of mixing.

It is sectional drawing which typically represents one embodiment of the vacuum double container of this invention. It is a figure explaining the manufacturing method of the vacuum double container of FIG. 1, Comprising: It is sectional drawing which represents typically the silver paste application | coating process to the inner container. FIG. 3 is a cross-sectional view schematically showing a subsequent process of the process in FIG. 2. FIG. 4 is a cross-sectional view schematically showing a subsequent process of the process in FIG. 3. FIG. 5 is a cross-sectional view schematically showing a subsequent process of the process in FIG. 4. It is a figure explaining one embodiment of the heat retention method of this invention using the vacuum double container of FIG.

Hereinafter, the present invention will be described in detail with reference to the drawings showing embodiments thereof.
FIG. 1 shows one embodiment of a vacuum double container used in the heat insulation method of the present invention.

As shown in FIG. 1, this vacuum double container 1 includes an inner container 2 and an outer container 3, and an electromagnetic induction heating element layer 4 is provided below the outer bottom surface and side surfaces of the inner container 2, A vacuum is formed between the outer container 3 and the inner container 2.
The inner container 2 and the outer container 3 are made of, for example, SUS304 that is nonmagnetic stainless steel.
The electromagnetic induction heating element layer 4 is formed by firing a mixed silver paste 40 as will be described later.
In addition, the application area and application thickness of the mixed silver paste 40 are liquid food and drink in which the temperature of the inner container 2 is poured into the vacuum double container 1 when the electromagnetic induction heating element layer 4 is induction-heated with a household IH cooker. It is desirable to set so that it only rises to the upper limit temperature of the optimum food and drink temperature of the thing, and as application | coating thickness, 0.1-100 micrometers is preferable, More preferably, it is 0.5-50 micrometers. If it is less than 0.1 μm, a sufficient heat generation effect cannot be obtained, and if it exceeds 100 μm, the cost increases, which is not preferable.

Next, the manufacturing method of this vacuum double container 1 is demonstrated in order of a process using FIGS.
(1) As shown in FIG. 2, a large-diameter silver paste having a baking temperature around 900 ° C. in which large silver particles of micron order are dispersed and a baking temperature in which small silver particles of 100 nm or less are dispersed are around 200 ° C. It is obtained by mixing a small-diameter silver paste and press-molding a non-magnetic stainless steel plate with a mixed silver paste 40 adjusted to a firing temperature not higher than the vacuum brazing temperature (for example, 500 ° C.) of the sealing plate 32 described later. Further, it is applied to the entire bottom surface of the bottomed cylindrical member 21 as the inner container constituting member having a flat bottom which becomes the inner container 2 and the outer surface near the bottom.
The application area and application thickness of the mixed silver paste 40 are not particularly limited as long as the electromagnetic induction heating element layer 4 can be heated to a sufficient temperature of the inner container 2 when the electromagnetic induction heating element layer 4 is induction-heated with a household IH cooker. When it is used repeatedly only for liquid foods and drinks, the coating area and the coating thickness are set such that the temperature of the inner container 2 rises only to the upper limit temperature of the optimum food and drink temperature for the liquid foods and drinks poured into the vacuum double container 1 You can also
(2) As shown in FIG. 3, there is a perforated cylindrical member 31 as an outer container structure obtained by press-molding a non-magnetic stainless steel plate having a hole 31a serving as a sealing port at the bottom. The double-cylinder main body 11 is obtained by externally fitting to the bottom cylindrical member 21 and welding and integrating the bottom-side cylindrical member 21 and the perforated cylindrical member 31 at the inlet side edges of the container.
(3) As shown in FIG. 4, the sealing plate 32 is set so as to be placed on the bottom of the double container body 11 so as to close the hole 31 a via the brazing material 33.
(4) As described above, the double container body 11 on which the sealing plate 32 is set is set in a vacuum heating furnace 5 as shown in FIG. The brazing material 33 is melted while exhausting the air in the hollow portion 11a of the double container body 11 from the hole 31a and evacuating it, and the sealing plate 32 is brazed to the double container body 11 so that the double container body 11 The vacuum double container 1 shown in FIG. 1 in which the holes 31a are sealed with the sealing plate 32 is obtained.
That is, since the mixed silver paste 40 has a firing temperature lower than the brazing temperature, the mixed silver paste 40 is fired simultaneously with the brazing to form the electromagnetic induction heating element layer 4 made of a silver sintered body.

In the vacuum double container 1, as described above, the inner container 2 and the outer container 3 are formed of the same kind of non-magnetic stainless steel plate, so that the welded portion can be easily welded.
Moreover, since the inner container 2 and the outer container 3 are stainless steel, they are excellent in impact resistance. Of course, since the electromagnetic induction heat generating layer 4 is provided on the outer wall surface of the inner container 2, the inner container 2 can be heated using an electromagnetic induction heating device such as an IH cooker.
Therefore, the food and drink in the vacuum double container 1 can be reheated by using an electromagnetic induction heating device such as an IH cooker without transferring the food and drink to another container, and the liquid food and drink as described below can be used. It can be suitably used for a heat retention method.

That is, in this warming method, first, as shown in FIG. 6, the empty vacuum double container 1 is placed so that the bottom can be received by the home IH cooker 6, and the IH cooker 6 is turned on. The electromagnetic induction heating element layer 4 is heated to heat the inner container 2 to the upper limit temperature of the optimum eating and drinking temperature such as coffee or soup. The determination as to whether or not the temperature of the inner container 2 has reached the upper limit temperature of the optimum eating and drinking temperature such as coffee and soup is empirically based on the combination of the vacuum double container 1 to be used and the IH cooker 6, for example. It can be performed by a method of setting the obtained time or a method of measuring the temperature inside the inner container using an infrared thermometer.
Next, when the heating is completed, the induction heating is stopped and the cooked or extracted liquid food or drink at the optimum food temperature is poured into the vacuum double container 1 where the inner container 2 is heated, and is not shown in the figure. After the inner lid with a spout of a conventional portable thermos, the outer lid is put on and the liquid food is kept warm.
Then, when desired, the liquid food or drink in the vacuum double container 1 is poured into the outer lid, or is put in another container such as a cup to eat or drink.

According to this heat retention method, when the liquid food or drink is poured into the vacuum double container 1, the inner container 2 is heated up to the upper limit temperature of the optimum food and drink temperature of the liquid food and drink, so that the optimum food and drink temperature is reached. The liquid food is not deprived of heat by the vacuum double container 1, and the optimum food temperature is maintained.
And since it heat-retains in this state, compared with the case where liquid food / drink is put into the conventional vacuum double container with which the inner container is not heated, it is hold | maintained at the optimal food-drinking temperature for a long time.

Moreover, since the liquid food to be poured is also at the optimum food and drink temperature, it can be eaten and consumed in the most delicious state even when eating and drinking immediately after being put in the vacuum double container 1.
Moreover, since the firing temperature of the mixed silver paste 40 is lower than the brazing temperature and can be fired at the same time as the brazing, the manufacturing process can be simplified compared to the case where a firing process is separately provided.
Furthermore, since the silver paste containing large silver particles and the silver paste containing small silver particles are mixed and used, it is possible to reduce the amount of silver paste containing expensive small silver particles and to reduce electromagnetic induction depending on the mixing amount. The electrical resistance of the heating element layer can also be controlled.

In addition, although the said heat retention method is not shown in figure, the electromagnetic induction heating which can set many vacuum double containers 1 in parallel in a store, and can induction-heat the electromagnetic induction heating body layer 4 of each vacuum double container 1 simultaneously. When the apparatus is installed and the inner container 2 of a large number of vacuum double containers 1 is heated in advance and a takeout customer comes to the store, the liquid food heated to the optimum food and drink temperature according to the customer's order is heated. It can also be applied as a new sales system such as a store that can take out hot coffee or soup that is sold in a vacuum double container 1.
That is, the customer can receive the vacuum double container 1 kept in the above-described heat state and take it to the workplace or take it home to eat and drink in the same manner as described above.

  In the above sales system, when selling liquid food and drink, along with the price of liquid food and drink, the deposit of the vacuum double container 1, inner lid and outer lid is received from the customer, and if the customer returns, the deposit is returned. Alternatively, when purchasing again, if the previous vacuum double container 1, the inner lid and the outer lid are returned, the liquid food and drink is put in another vacuum double container 1 in which the inner container 2 is heated in advance as described above. It may be possible for customers to pay only for liquid food and drink.

The present invention is not limited to the above embodiment. For example, in the above embodiment, the electromagnetic induction heating element layer 4 is optimal for liquid food and drink when heated using a home IH cooker 6 by controlling the application area and application thickness of the mixed silver paste 40. Although the temperature only reaches the upper limit of the eating and drinking temperature, the heating setting temperature may be controlled by the electromagnetic induction heating device by providing a temperature sensor or a timer in the electromagnetic induction heating device.
In the embodiment described above, the lid is removed from the vacuum double container, and the liquid food and drink in the vacuum double container is transferred to the cup for eating and drinking, but for example, directly from the mouth on the nozzle attached to the lid. It may be possible to drink, or the lid may be removed from the container so that it can be directly taken from the container.

  In the above embodiment, the vacuum double container of the present invention is used for the heat insulation method of the present invention. However, the vacuum double container of the present invention directly vacuums tea from tea bottles that are not heated. You may make it use for the method of induction-heating an electromagnetic induction heating body layer with an IH cooker etc. in the state enclosed in the double container, and warming tea.

DESCRIPTION OF SYMBOLS 1 Vacuum double container 11 Double container main body 2 Inner container 21 Bottomed cylindrical member (inner container component)
3 Outer container 31 Perforated cylindrical member (outer container component)
31a Vacuum suction hole 32 Sealing plate 33 Brazing material 4 Electromagnetic induction heating element layer 40 Mixed silver paste 5 Vacuum heating furnace 6 IH cooker

Claims (1)

A double container body having a sealing port in which an inner container constituent member serving as an inner container and an outer container constituent member having a sealing port are integrated at a container inlet side portion is placed in a vacuum heating furnace, and a brazing material is used. Before the sealing step of melting and sealing the sealing port directly with the brazing material or sealing the periphery of the sealing plate with the brazing material, A metal paste having a firing temperature equal to or lower than the melting temperature is applied to the outer wall surface of the inner container constituent member, and the sealing process is performed at the same time as the brazing material melting temperature is set at the vacuum heating furnace or higher. A method of manufacturing a vacuum double container that is baked to form an electromagnetic induction heating layer,
The inner container component is made of a nonmagnetic metal material,
The outer container component is made of a metal material of the inner container component and an easily weldable non-magnetic metal material,
The metal paste is a mixed metal paste in which a metal paste containing metal particles having a large particle size and a metal paste containing metal particles having a small particle size are mixed to adjust the firing temperature to be equal to or lower than the melting temperature of the brazing material. A manufacturing method of a vacuum double container characterized by the above.

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