JP6518017B2 - Heat insulation container - Google Patents

Description

  The present invention relates to a thermally insulated container, and more particularly to a thermally insulated container made of glass.

  Conventionally, there is a heat insulation container using a glass container. The heat insulation container is, for example, incorporated in an outer case, and has a structure in which an opening is closed by a lid member, and is used for a product that keeps the temperature of contents such as hot water at a desired temperature for a long time (e.g. Literature 1).

Further, in Patent Document 2, the space between the inner and outer glass containers is evacuated to form a vacuum heat insulating layer, and the vacuum insulation layer is made of glass, and a pad (spacer) is disposed between the inner and outer containers. A container is disclosed.
It is natural that the spacer is preferably a material having low thermal conductivity. Also in addition to this, spacers have been considered to require flexibility and cushioning. That is, at the time of manufacture of the heat insulation container, the spacer had to have flexibility to secure a space between the inner container and the outer container while preventing breakage due to heat distortion of the inner container and the outer container. In addition, the spacer needs to have a cushioning property to prevent breakage of the container against an impact such as a product drop by the user during use.

Japanese Patent Application Laid-Open No. 2000-201834 Japanese Patent Application Laid-Open No. 2002-58605

In order to improve such a spacer, the present inventors have repeatedly studied the spacer in detail. That is, it has been considered that the spacer is preferably made of a soft material to some extent, such as requiring flexibility in manufacturing the heat insulation container and shock absorbing properties in use. Therefore, calcium silicate-based materials, previously known as building materials, have a low thermal conductivity, and thus have potential for application to heat insulation containers. However, calcium silicate-based materials have been considered to be undesirable for the application to spacers of thermal insulation containers because they are harder than conventional spacers.
However, as a result of intensive studies by the inventors, it is possible not only to prevent breakage at the time of manufacture but also for impact strength at the time of use by using a calcium silicate material or diatomaceous earth material having a specific hardness as a spacer. It has been found that an excellent heat insulation container can be obtained and the above problems can be solved, and the present invention has been completed.
The present invention has been made in view of the above-described circumstances, and it is an object of the present invention to provide a glass insulation container which is less damaged at the time of manufacture and is excellent in impact strength.

The above problems can be achieved by the following means. That is, the present invention is as follows.
[1]
With a glass inner container,
A glass outer container which surrounds the outside of the inner container and is connected by an opening;
A spacer disposed between the inner container and the outer container so as to be in contact with both containers;
A thermally insulated container in which a space defined by the inner container and the outer container is evacuated.
The heat insulating container, wherein the spacer is made of a calcium silicate based material or a diatomaceous earth based material, and a load required for 0.1 mm compression at a compression rate of 0.1 mm / min is 175 N or less.
[2]
In the heat insulation container as described in [1],
At least one of the surfaces of the spacer in contact with the inner container and the outer container is formed as an uneven surface.
[3] In the heat insulation container according to [1] or [2],
In the spacer, the surface roughness of at least one of the surfaces in contact with the inner container and the outer container is 20 to 50 μm in arithmetic average height Sa.
[4]
In the heat insulation container according to any one of [1] to [3],
The spacer has a load required to be compressed by 0.5 mm at a compression speed of 0.1 mm / min of 1,500 N or more.
[5]
In the heat insulation container according to any one of [1] to [4],
The material of the spacer is a calcium silicate based material, and the calcium silicate based material dewaters and forms a slurry composed of a uniform mixture of the following (A) to (D), and the obtained molded product is 6 kg / cm ² It is obtained by steaming the above-mentioned pressurized steam to react the silicic acid raw material and the lime raw material, and then heating to 330 ° C. or more under atmospheric pressure to remove water detached from the molded product.
(A) 100 parts by weight of a mixture of lime raw material and silica raw material having a CaO / SiO ₂ molar ratio of 0.6 to 1.2 (B) Zonotolite obtained by hydrothermal synthesis 50 to 170 parts by weight (C) fiber Wollastonite 15 to 150 parts by weight (D) water 2 to 8 times the total solids

  ADVANTAGE OF THE INVENTION According to this invention, the container damage at the time of manufacture can be suppressed, and the heat insulation container excellent in the impact strength at the time of use can be provided.

It is principal part sectional drawing of the heat insulation container of embodiment of this invention. It is a perspective view of the spacer shown in FIG. It is a cross-sectional schematic diagram of the part which followed the AA shown in FIG. 2, Comprising: (a) is an expanded sectional view which shows the state which the container side surface contact | connected to the surface of a spacer, (b) is a container side surface. It is an expanded sectional view showing the state where it was crushed. It is a figure which shows the measurement area | region of the surface roughness of a spacer. It is a figure which shows the measurement area | region of the surface roughness of a spacer. It is measurement data of the 3D image of a spacer (1), and an outline curve. It is measurement data of the 3D image of a spacer (1), and an outline curve. It is measurement data of the 3D image of a spacer (7), and an outline curve. It is measurement data of the 3D image of a spacer (7), and an outline curve.

  Hereinafter, an embodiment of the present invention will be described with reference to FIGS. 1 to 3. 1 is a vertical sectional view of the main part of the heat insulation container cut vertically (axial direction) at an angle of 120 degrees with respect to the axial center (central axis) CL, and FIG. 2 is a perspective view of the spacer . FIG. 3 is an enlarged cross-sectional view schematically showing the surface of the spacer.

  As shown in FIG. 1, the heat insulation container 1 includes an inner container 2 made of glass, an outer container 3 made of glass, which surrounds the outer container 2 and is connected by an opening 1 h, and an inner container 2. And a spacer disposed between the outer container and the container so as to be in contact with both containers. The space 4 defined by the inner container 2 and the outer container 3 is evacuated.

  The heat insulation container 1 is shape | molded so that the space 4 between both containers may be made by connecting the inner container 2 and outer container 3 made of glass in the manufacture. Thereafter, the space 4 between the two containers is exhausted from the exhaust part 3e provided on the bottom side of the outer container 3, and the exhaust part 3e is closed to make a vacuum.

Here, prior to stacking the two containers 2 and 3, the spacer 10 is bonded to the outer surface of the bottom portion 1 a of the inner container 2 via an adhesive. Three spacers 10 are arranged to surround the axial center CL of the inner container 2 at equal intervals, and form a space 4 between the outer container 3 and the inner container 2. Then, after the outer container 3 is disposed so as to cover the inner container 2, it is molded so as to be narrowed down in a manner along the inner container 2 while appropriately heating. Thereafter, the exhaust unit 3e is evacuated, and the exhaust unit 3e is heated and welded to maintain the vacuum of the space 4. The heat insulation container 1 manufactured in this manner is generally used in a state of being suitably incorporated into the outer case 20.
The number of the spacers 10 can be appropriately changed according to the size of the heat insulation container, and is preferably 2 or more, more preferably 3 to 10, and still more preferably 3 to 5. Particularly preferably, the number is three, and while the stability of the relative position between the inner container 2 and the outer container 3 is high, the number of places where heat conduction occurs can be minimized.

  As shown in FIG. 2, the spacer 10 has a predetermined thickness d2, and is configured as a cylindrical member having contact surfaces 10s on the front and back. The contact surface 10 s is disposed to abut on the inner container 2 and the outer container 3. An adhesive is applied to one or both surfaces of the contact surface 10s as described above, and the adhesive is adhered to the inner container 2 and disposed between the inner container 2 and the bottom 1b of the outer container 3.

The spacer 10 is made of a calcium silicate-based material or a diatomaceous earth-based material, and is a material having a load required for compression of 0.1 mm at a compression speed of 0.1 mm / min of 175 N or less.
The calcium silicate based material in the present invention is a material containing calcium silicate, and is a material containing a hydrate of a compound in which calcium oxide (CaO) and silicic acid (SiO ₂ ) are bonded. Calcium silicates include, for example, zonotolite, tobermorite, wollastonite, other calcium silicate hydrates and mixtures thereof.

More preferably, the calcium silicate-based material is a calcium silicate-based material described in JP-A-55-167167, which is obtained by dewatering and forming a slurry composed of a uniform mixture of the following (A) to (D): The formed product is subjected to steam heat treatment with pressurized steam of 6 kg / cm ² or more to react the silicic acid raw material and the lime raw material, and then heated to 330 ° C. or higher under atmospheric pressure to remove water detached from the molded product. Obtained by
(A) 100 parts by weight of a mixture of lime raw material and silica raw material having a CaO / SiO ₂ molar ratio of 0.6 to 1.2 (B) Zonotolite obtained by hydrothermal synthesis 50 to 170 parts by weight (C) fiber Wollastonite 15 to 150 parts by weight (D) water 2 to 8 times the total solids

  Examples of the lime raw material, the silicic acid raw material, the Zonotrite, and the fibrous wollastonite include those described in JP-A-55-167167, and preferred examples are also the same. The calcium silicate based material can be obtained according to the method of JP-A-55-167167.

The calcium silicate based material may further contain reinforcing fibers, additives and the like.
The spacer 10 can form, for example, a plate-like calcium silicate based material into a desired shape by a cutting process or a punching process. Lumi board, Ecolux, NA Lux, Hirak, Mitsubishi Hisitaika, Chiyoda sera board etc. are marketed as a calcium silicate board etc. as a plate-shaped calcium-silicate type material.

The diatomaceous earth material in the present invention means a material containing diatomaceous earth and may further contain reinforcing fibers, additives and the like. Diatomaceous earth is a soft rock or soil mainly composed of fossilized diatom shells, which is a type of algae, and contains silica as its main component, but it also contains alumina, iron oxide, oxides of alkali metals, etc. in addition to silica. May be The diatomaceous earth-based material is commercially available, and the plate-like diatomaceous earth-based material can be formed into a desired shape by a cutting process or a punching process.

A calcium silicate based material or a diatomaceous earth based material has been considered to be hard conventionally and not suitable as a buffer member, but in the present invention, the spacer 10 is compressed 0.1 mm at a compression speed of 0.1 mm / min. Use a calcium silicate based material with a necessary load of 175 N or less. The load required for 0.1 mm compression at a compression speed of 0.1 mm / min of the spacer 10 is preferably 10 N or more and 175 N or less, more preferably 45 N or more and 175 N or less, and 45 N or more and 120 N or less Is more preferred. When the inner container 2 is inserted into the outer container 3 to manufacture a double container at the time of manufacture of the heat insulation container by reducing the load required for 0.1 mm compression at a compression speed of 0.1 mm / min to 175 N or less Can be prevented.
In the production of the double container, for example, the spacer is adhered to the outer surface of the bottom of the inner container with an adhesive, and the inner container with the spacer adhered to the outer surface of the bottom is inserted into the outer container. When the spacer attached to the inserted inner container and the outer container are in contact with each other, it is necessary for the spacer 10 to cushion if the load required to compress 0.1 mm at a compression speed of 0.1 mm / min is 175 N or less A function is exhibited and the damage prevention effect of the inner container 2 and the outer container 3 is exhibited.
The material of the spacer 10 in the present invention is preferably a calcium silicate based material.

  The load required for 0.1 mm compression at a compression speed of 0.1 mm / min of the spacer 10 can be adjusted by appropriately changing the composition, shape, contact surface state, etc. of the calcium silicate based material.

The shape of the spacer 10 is not particularly limited, but in the present embodiment, the spacer 10 is a cylindrical shape, preferably having a diameter of 6.6 to 7.0 mm, and preferably 6.7 to 6.9 mm. More preferable. The thickness (height) of the spacer 10 is preferably 3.6 to 4.2 mm, and more preferably 3.7 to 4.0 mm. By doing this, the spacer 10 can tolerate an amount of displacement for compression of 0.05 mm or more. Therefore, at the time of manufacturing the heat insulation container, the spacer 10 may be narrowed even if the distance between the inner container 2 and the outer container 3 is narrowed by 0.05 mm or more (the upper limit is about 6 mm) by heat treatment such as annealing. Damage to the inner container 2 and / or the outer container 3 can be suppressed without being destroyed.
In the spacer 10, as shown in FIG. 3, it is preferable that the contact surface 10s of at least one of the surfaces in contact with the inner container 2 and the outer container 3 be formed as an uneven surface.

After the calcium silicate board is polished to give unevenness, it is possible to obtain the spacer 10 having an uneven surface formed by cutting or punching. The calcium silicate board may be ground after being machined or stamped. Sanding (for example, No. 120 and No. 80, preferably No. 30) or the like can be used for the polishing, and the contact surface 10s can be made to be an uneven surface having a desired roughness.
When the calcium silicate based material is formed into a plate, the asperity shape can be transferred by a mold or the like to form asperity surface.

The surface roughness of the contact surface 10s is more preferably 20 to 50 μm, and still more preferably 20 to 45 μm, as the arithmetic average height Sa.
If the surface roughness of the contact surface 10s is within the above range at the arithmetic average height Sa, a sufficient cushioning function is exhibited when the spacer adhered to the inner container at the time of manufacturing the heat insulation container contacts the outer container. .
The arithmetic average height Sa is a three-dimensional extension of the arithmetic average roughness Ra, which is a two-dimensional roughness parameter, and is a three-dimensional roughness parameter (three-dimensional height direction parameter). Arithmetic mean height can be calculated by the method described in the ISO standard (ISO 25178) from surface shape data measured by a laser microscope or the like.

In the spacer 10, the surface roughness Ra of at least one of the contact surfaces 10s in contact with the inner container 2 or the outer container 3 is preferably 20 to 200 μm, and more preferably 25 to 50 μm.
Surface roughness Ra is an arithmetic mean roughness calculated | required based on JISB0601: 2013.
Moreover, it is preferable that it is 70-250 micrometers, and, as for largest height Rz, it is more preferable that it is 130-230 micrometers.
The maximum peak height Rp is preferably 30 to 200 μm, more preferably 35 to 150 μm, and still more preferably 45 to 120 μm.
The maximum valley depth Rv is preferably 30 to 200 μm, more preferably 35 to 170 μm, and still more preferably 40 to 150 μm.
The average height Rt is preferably 60 to 300 μm, preferably 100 to 250 μm, and more preferably 130 to 230 μm.
The ten-point average roughness Rz JIS is preferably 50 to 150 μm, and more preferably 60 to 120 μm.
The maximum height Sz is preferably 150 to 300 μm, and more preferably 170 to 300 μm.
The aspect ratio Str of the surface property is preferably 0.1 to 0.35, and more preferably 0.1 to 0.3.
It is preferable that it is 4.0-7.0 (1 / mm), and it is more preferable that it is 5.0-6.5 (1 / mm) that Spc which is an arithmetic mean music of a mountain top.
The developed area ratio Sdr of the interface is preferably 0.01 to 0.1, and more preferably 0.02 to 0.05.

  The maximum height Rz, the maximum height Rp, the maximum valley depth Rv, the average height Rt, and the ten-point average roughness Rz JIS are determined in accordance with JIS B0601: 2013. Further, the maximum height Sz, the aspect ratio Str of the surface property, Spc which is the arithmetic mean curve of the peak, and the developed area ratio Sdr of the interface can be determined in accordance with ISO 25178.

  Thus, in the spacer 10, the contact surface 10s in contact with the inner container 2 or the outer container 3 is formed as an uneven surface, so that the contact state between the inner container 2 or the outer container 3 and the contact surface 10s is innumerable points. It comes in contact (see FIG. 3 (a)). As a result, it is presumed that the buffer function is positively affected. This is shown in FIG. 3B, for example, at the top 11t of the convex portion in point contact with the inner container 2 when an impact is applied to the spacer 10 (impact in the arrow direction shown in FIG. 3B). As a result, the phenomenon that the convex portion collapses occurs. As a result, the buffer function is exhibited by the breakage of the convex portion. On the other hand, since the spacer itself is a hard material, no large deformation occurs, and no deformation such as breakage of the connection portion 6 of the opening 1 h occurs, and an effective cushioning effect is exhibited.

  The load necessary for the spacer 10 to be compressed by 0.5 mm at a compression speed of 0.1 mm / min is preferably 1500 N or more, and more preferably 1800 N or more and 2200 N or less. By setting the load necessary for 0.5 mm compression at a compression speed of 0.1 mm / min to 1500 N or more, it is possible to provide a thermally insulated container with better impact strength. When a large impact such as a drop is applied to the heat insulating container, shock can be absorbed without significant deformation at the connection portion between the inner container 2 and the outer container 3. As a result, for example, the connection portion between the inner container 2 and the outer container 3 The damage prevention effect of 6 is exhibited.

  When the heat insulation container is damaged by an impact such as a drop, it can be inferred to be due to the support form of the inner container 2. That is, when the heat insulation container 1 is dropped or the like, the mass of the content W inside the container (inner side of the inner container 2) is supported by the inner container 2, and the inner container 2 is connected to the connection portion 6 with the outer container 3. Since the bottom portion 1b opposite to the connection portion 6 is supported by the spacer 10, stress due to the drop tends to be concentrated at the connection portion 6 with the outer container 3 of the inner container 2. Here, conventionally, if the spacer 10 is hard, it is feared that the contact point between the spacer 10 and the inner container 2 may be damaged, and it has been considered that a relatively flexible material is preferable. However, if the spacer 10 is a material having flexibility, the amount of elastic deformation increases when the product is dropped, and stress concentration in the connection portion 6 can not be suppressed, and in many cases, the connection portion 6 is considered to be broken. The spacer 10 according to the present embodiment has a hardness equal to or greater than a specific numerical value, so that stress concentration at the connection portion 6 can be suppressed, and a heat insulating container excellent in impact strength can be obtained.

  As described above, by using a preferable spacer 10 in the present embodiment with reference to a specific numerical value determined in a compression test, breakage at the time of manufacturing the heat insulation container can be suppressed, and at the time of use Can provide a thermally insulated container with excellent impact strength.

  Hereinafter, the present invention will be more specifically described based on examples, but the present invention is not limited to the following examples.

〔Surface roughness〕
A spacer (1) of a calcium silicate based material having a shape shown in FIG. 2 in which a calcium silicate plate prepared according to the method described in JP-A-55-167167 was polished after being polished with a # 24 file and punched out. Prepared. The size was 6.8 mm in diameter and 3.8 mm in thickness. The surface roughness (JIS B 0601: 2013 and ISO 25178) of 10 of the prepared spacers (1) of the calcium silicate based material (JIS B 0601: 2013 and ISO 25178) In the area of the arrow connecting the marks, the surface roughness Ra, the maximum height Rz, the maximum peak height Rp, the maximum valley depth Rv, the average height Rt, the ten-point average roughness Rz JIS; The arithmetic mean height Sa, the maximum height Sz, the aspect ratio Str of the surface property, the arithmetic mean curve Spc of the tops of the peaks, and the developed area ratio Sdr of the interface were measured and listed in Table 1.
For the measurement, a non-contact 3D measuring device (manufactured by Keyence Corporation, VR-3000) was used.

Prepare a calcium silicate material spacer (7) in the same manner as above except that the calcium silicate plate is processed without polishing, and measure the surface roughness of 10 of them (samples 2-1 to 2-10) And listed in Table 1.
Also, 3D images of each sample and measurement data of contour curves are shown in FIGS.

Example 1
A glass insulating container was manufactured using a spacer (1) of calcium silicate based material.
The spacer (1) used had a shape as shown in FIG. 2 obtained by grinding and punching a calcium silicate plate prepared according to the method described in JP-A-55-167167 with a # 24 file. The size was 6.8 mm in diameter and 3.8 mm in thickness.
As a result of the compressive elasticity test (test condition 1) of the spacer (1), the load required for 0.1 mm compression at a compression speed of 0.1 mm / min was about 100 N.
(Test condition 1)
Testing machine: Technograph TG-10kN manufactured by Minebea Co., Ltd.
Compression speed: 0.1 mm / min
Compression distance: 0.2 mm from test sample contact Compression contact position: Test jig starting test from 1N position on test sample:
Load cell: 5000 N
Jig: diameter 100mm x 25mm

Moreover, as a result of the compression elasticity test (test condition 2) of the spacer (1), the load required to be compressed by 0.5 mm at a compression speed of 0.1 mm / min was 1500N.
(Compressive elasticity test equipment and test conditions 2)
Testing machine: Technograph TG-10kN manufactured by Minebea Co., Ltd.
Compression speed: 0.1 mm / min
Compressive distance: 1.0 mm from test sample contact Compressive contact position: Test jig starting test from 1N position on test sample:
Load cell: 5000 N
Jig: diameter 100mm x 25mm

The heat insulation container is shown in FIG. 1 and has a height dimension (H) of 180 mm, a maximum diameter (D1) of 160 mm, an opening inner diameter (D2) of 45 mm, an opening outer diameter (D3) 65 mm, and a container glass thickness (D4) ) Was 1.5 mm, and 1319 pieces were manufactured.
The three spacers of the spacer (1) are previously bonded and placed on the bottom of the inner container, and the inner container is placed in the outer container, and in this state, the opening is heated and the opening is narrowed together with heating. Then, the exhaust part was evacuated, and the exhaust part was heated and welded to manufacture a heat insulation container.
An adhesive was used to fix the spacer, and 0.015 g of each was applied to one side of the spacer.
Of the 1319 insulated containers produced, 3 were damaged.

The drop test was conducted under the following conditions using five heat insulation containers manufactured above.
The exterior case is made of metal, and with the opening closed with a lid, with 2.2 liters of water as content, from the height of 0.5 m, the bottom of the finished product container is in the direction of hitting the floor It was dropped onto a 30 mm thick Lauan plate laid on a concrete floor.
Among the five heat insulation containers according to the present invention, zero were broken in the drop test.

[Examples 2, 3 and Comparative Examples 1 to 4]
The heat insulation containers of Examples 2 and 3 and Comparative Examples 1 to 4 were manufactured in the same manner as Example 1 except that the spacers were changed to those shown in Table 2, and the drop test was performed.

  In addition, although the said embodiment demonstrated the heat insulation container using the spacer which consists of calcium-silicate type material, even if it replaces a calcium-silicate type material with a diatomaceous earth type material, the same effect can be produced.

  As mentioned above, although one Embodiment of this invention was described, this invention is not limited to this, It can change suitably. As long as the spacer has a specific hardness, there is no particular limitation on the size, the shape, the number and the position of the installation, etc., as long as it does not affect the heat insulation. For example, in the above embodiment, the spacer is a cylinder, but it may not be a cylinder. Further, the shape of the heat insulation container is not limited to the shape shown in FIG.

  ADVANTAGE OF THE INVENTION According to this invention, the container damage at the time of manufacture can be suppressed, and the heat insulation container excellent in the impact strength at the time of use can be provided.

Although the invention has been described in detail and with reference to specific embodiments, it will be apparent to those skilled in the art that various changes and modifications can be made without departing from the spirit and scope of the invention.
This application is based on Japanese Patent Application (Japanese Patent Application No. 2016-187513) filed on September 26, 2016, the contents of which are incorporated herein by reference.

DESCRIPTION OF SYMBOLS 1 thermal insulation container 2 inner container 3 outer container 4 space 6 connection part 10 spacer 10s contact surface CL central axis W content

Claims (4)

With a glass inner container,
A glass outer container which surrounds the outside of the inner container and is connected by an opening;
A spacer disposed between the inner container and the outer container so as to be in contact with both containers;
A thermally insulated container in which a space defined by the inner container and the outer container is evacuated.
The spacer, Rannahli or calcium silicate-based materials, at least one of the surfaces in contact with the inner container and the outer container is configured to irregular surface, 0.1 mm compressed at compression speed 0.1 mm / min Insulated container whose load required to do not exceed 175N. The heat insulation container according to claim 1, wherein a surface roughness of at least one surface of the spacer in contact with the inner container and the outer container is 20 to 50 m in arithmetic average height Sa. The heat insulation container according to claim 1 or 2 , wherein a load required for said spacer to be compressed by 0.5 mm at a compression speed of 0.1 mm / min is 1,500 N or more. Before SL calcium silicate based material, the following (A) ~ dried molded slurry consisting homogeneous mixture of (D), the resulting molded product and steamed to silicate material with 6 kg / cm ² or more pressurized steam The reaction product according to any one of claims 1 to 3 , which is obtained by reacting water with a lime raw material and then heating to a temperature of 330 ° C or higher under atmospheric pressure to remove water detached from the molded product. Insulated container.
(A) 100 parts by weight of a mixture of lime raw material and silica raw material having a CaO / SiO ₂ molar ratio of 0.6 to 1.2 (B) Zonotolite obtained by hydrothermal synthesis 50 to 170 parts by weight (C) fiber Wollastonite 15 to 150 parts by weight (D) water 2 to 8 times the total solids

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