WO2006103739A1

WO2006103739A1 - Heat insulated container

Info

Publication number: WO2006103739A1
Application number: PCT/JP2005/005778
Authority: WO
Inventors: Takafumi Fujii; Yu Kobayashi
Original assignee: Thermos K.K.
Priority date: 2005-03-28
Filing date: 2005-03-28
Publication date: 2006-10-05
Also published as: JPWO2006103739A1; CN101052334A; DE112005003091T5; CA2590409A1; US20080190942A1; GB0710438D0; GB2435091A

Abstract

A heat insulated container that exhibits given heat retention performance, permitting ascertaining of exhibition of the heat retention performance from the appearance thereof. There is provided heat insulated container (10) having at least either the external surface of glass internal container (12) or the internal surface of glass external container (16) coated with radiation preventing film (20), the internal container (12) disposed inside the external container (16) with empty space (14) interposed therebetween, the internal container (12) and the external container (16) united together, the empty space (14) evacuated to vacuum and hermetically sealed, characterized in that the radiation preventing film (20) at its surface has particles whose average diameter is ≥ given value. The heat insulated container (10) realizes satisfactory heat retention performance as the average diameter of the particles at the surface of the radiation preventing film (20) is ≥ given value.

Description

Insulated container

Technical field

The present invention relates to a heat insulating container, and more particularly to a glass heat insulating container formed by joining an inner container and an outer container and evacuating a gap provided between the inner container and the outer container. Background art

Conventionally, a heat insulating container made of glass is provided with a certain gap inside the outer container, the inner container is disposed, and the vicinity of the mouth is melted to make the mouth of the inner container and the mouth of the outer container Are integrally formed, and the gap is evacuated to provide a vacuum heat insulating layer. In order to reduce the heat transfer between the inside and outside of the heat insulating container, the outer surface of the inner container is exposed to radiation such as an ITO film (a substance in which an oxide of indium (In) is doped with tin (Sn)). A protective film is coated, and this coating is performed by sputtering, CVD, PVD, or the like (for example, see Patent Document 1).

Patent Document 1: JP 2003-299582

Disclosure of the invention

Problems to be solved by the invention

[0003] However, even if this radiation prevention film is coated with the same device, the heat retention performance may vary. For example, when a radiation prevention film is coated by sputtering, the heat insulation performance of the radiation prevention film may be different before and after the replacement of the target even if the sputtering is performed under the same conditions.

[0004] This heat retention performance is considered to be related to the film thickness of the radiation preventing film. However, in order to measure the film thickness, it is necessary to cut the insulated container, and once cut, the product cannot be made into a product. Therefore, whether or not the heat insulation container has a predetermined heat insulation performance is determined by assembling the heat insulation container that is not based on the film thickness until the final process, and then adding hot water to the heat insulation container and the temperature of the hot water after several hours have passed. It must be done directly by measuring This inspection takes time, resulting in high manufacturing costs. Even if it is determined that the heat insulation performance of the insulated container does not meet the standards! The film cannot be coated, resulting in disposal, which further increases the overall manufacturing cost.

[0005] The present invention has been made to solve such problems, and has an object to provide a heat insulating container having a certain heat retaining performance and capable of confirming the heat retaining performance in a non-destructive manner. And

Means for solving the problem

[0006] As a result of intensive studies to solve the above problems, the present inventors have found that there is a certain relationship between the average particle size of the particles on the surface of the radiation prevention film and the heat retention performance. . The inventors have found that by maintaining the particle size at a predetermined value or more, a certain heat retention performance can be secured, and the present invention has been completed.

[0007] In the heat insulation container according to claim 1 of the present invention, at least one of the outer surface of the glass inner container and the inner surface of the glass outer container is coated with a radiation prevention film, and the inner container is A heat-insulating container formed by providing a space inside the outer container, joining the mouth of the inner container and the mouth of the outer container, and evacuating and sealing the space The average particle size of the particles on the surface of the radiation preventing film is not less than a predetermined value.

[0008] The heat insulation container according to claim 2, wherein at least one of the outer surface of the glass inner container and the inner surface of the glass outer container is coated with a radiation prevention film, and the inner container is the outer container. In the heat insulating container formed by disposing and arranging a gap inside, joining the mouth of the inner container and the mouth of the outer container, and evacuating and sealing the gap The average particle size of the surface particles of at least a portion of the radiation preventing film that is present on the side portion of the heat insulating container is a predetermined value or more.

[0009] Further, the heat insulation container according to claim 3 is characterized in that, in claim 1 or 2, the predetermined value is 5 Onm.

[0010] The insulated container according to claim 4 is characterized in that, in any one of the forces 1 to 3, the thickness of the radiation preventing film is 150 nm or more.

[0011] The heat insulation container according to claim 5 is characterized in that, in any one of the forces 1 to 4, the radiation prevention film is an ITO film. The invention's effect

[0012] According to the heat insulating container of the present invention, sufficient heat retention performance can be obtained by setting the average particle size of the particles on the surface of the radiation preventing film to a predetermined value or more. Since the particle diameter can be measured non-destructively by observing from the outside, it can be inspected quickly, and even if it is judged that the coating is insufficient, it is possible to form a film repeatedly. Therefore, the inspected thermal insulation container is not wasted, and as a result, the entire manufacturing cost can be reduced.

[0013] It should be noted that the part of the radiation preventing film that greatly affects the heat retaining performance of the heat insulating container is a part that exists on the side of the heat insulating container. Therefore, if the average particle diameter of the surface particles of at least the side portions of the heat insulating container in the radiation prevention film is equal to or greater than a predetermined value, sufficient heat retaining performance can be ensured.

[0014] Further, by setting the average particle size of the surface particles of the radiation preventing film to 50 nm or more, the heat insulating container having the radiation preventing film is sealed with lOOOcc of 95 ° C hot water inside, Even after 6 hours have passed in a room at 20 ° C, the temperature of the hot water inside can be kept above 60 ° C.

[0015] Furthermore, by setting the film thickness of the radiation prevention film to 150 nm or more, the heat insulation container equipped with the radiation prevention film is sealed with 95 ° C hot water lOOOcc inside, and the room temperature is 20 ° C. Even after 6 hours, the temperature of the internal hot water can be kept above 60 ° C. Brief Description of Drawings

FIG. 1 is a cross-sectional view of a heat insulating container according to a preferred embodiment of the present invention.

FIG. 2 is a graph showing the relationship between the ITO particle size, the heat retention performance, and the thickness of the ITO film.

FIG. 3 is a graph showing the relationship between the soot particle size, the heat retention performance and the thickness of the capsule under different conditions from those in FIG.

[Fig. 4] Enlarged photographs of capsules with various particle sizes.

Explanation of symbols

[0017] 10 Insulated container

12 Inner container

14 Gap

16 Outer container 20 Anti-radiation film

22 Side

BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings.

FIG. 1 is a cross-sectional view of a heat-insulating container 10 that is useful for an embodiment of the present invention. As shown in the figure, the heat insulating container 10 of the present embodiment includes a glass inner container 12 and a glass outer container 16 disposed with a gap 14 having a certain width outside the inner container 12. Is provided. The outer container 16 is an upper outer container 16a and a lower outer container 16b joined together.The inner container 12 and the upper outer container 16a are joined at the mouth 18, and the inner surface of the outer container 16 and the outer surface of the inner container 12 are joined. The gap 14 between them is kept in a vacuum state. The outer surface of the inner container 12 is covered with an ITO film 20 as a radiation preventing film in order to reduce heat radiation. The ITO film 20 is coated by a sputtering method, and when observed from the outside, the ITO film 20 has particles having a particle diameter of a predetermined value or more on the surface. In the present embodiment, the ITO film 20 has particles having a particle size of a predetermined value or more over the entire surface of the ITO film 20. However, the present invention is not limited to this, and the average particle diameter of at least the portion of the surface of the ITO film 20 existing on the side portion 22 of the heat insulating container 10 may be a predetermined value or more.

[0020] Here, the predetermined value means that 95 ° C of hot water is put in a heat insulating container having an ITO film having particles having a particle size equal to or larger than that value, and sealed, and 20 ° This is the smallest particle size at which the temperature of the hot water inside the insulated container is maintained at 60 ° C or higher even after 6 hours have passed in the C room. In addition, place an insulated container in a room at 20 ° C, put 10 OOcc of hot water at about 95 ° C in it, seal it, and the temperature of the hot water after 6 hours has passed is referred to as heat insulation performance in this specification. This 60 ° C is generally the lowest temperature required to function as an insulated container.

[0021] Therefore, 95 ° C hot water is lOOOOcc sealed in the inside of the heat insulating container 10 of this embodiment, and after placing in a room at 20 ° C for 6 hours, the hot water inside the heat insulating container 10 is removed. When temperature is measured, it is over 60 ° C.

As described above, in the heat insulating container 10 of the present embodiment, the ITO film 20 is covered on the outer surface of the glass inner container 12, the inner container 12 is disposed with the gap portion 14 provided in the outer container 16, and the inner container 12 and outer container 16 In the heat insulating container 10 formed by joining and evacuating and sealing the gap portion 14, the average particle size of the particles on the surface of the ITO film 20 is not less than a predetermined value.

[0023] According to the heat insulating container 10, the heat retention performance of 60 ° C can be obtained by setting the average particle size of the particles on the surface of the capsule 20 to a predetermined size or more. And since the particle size can be inspected non-destructively by observing from the outside, it can be inspected quickly. Even if the coating is judged to be inadequate, since it has been inspected nondestructively, it is possible to further form a film on the coated ITO film. Therefore, the insulative container that has been inspected is not wasted, and as a result, the overall manufacturing cost can be reduced.

In this embodiment, the ITO film 20 is used as the radiation preventing film, but the type of the radiation preventing film is not limited to this, and a metal oxide (semiconductor) such as ZnO, SiO 2, SnO 2, or TiO 2 is used. )so

X 2 X

There may be. In this case, the average particle size of the particles on the surface of the anti-radiation film is also sealed by placing 95 ° C hot water in a heat insulating container equipped with the anti-radiation film and placing it in a room at 20 ° C for 6 hours. After the lapse of time, the particle size is not less than the minimum value at which the temperature of the hot water inside the heat insulating container is maintained at 60 ° C or higher. In the present embodiment, the ITO film 20 is covered on the outer surface of the inner container 12, but the surface to be covered is not limited to this, and may be another surface such as the inner surface of the outer container 16.

Example 1

[0025] The average particle size (ITO particle size) of the ITO film surface particles when ITO is spattered to the outer surface of the inner container in an atmosphere where the weight ratio of argon to oxygen is 76 to 7. The relationship between the film thickness and the heat insulation performance of the heat insulation container of the finished product equipped with the inner container coated with the ITO film was investigated.

[0026] Graph A in Fig. 2 is a graph showing the relationship between the heat retention performance and the ITO particle size, where the vertical axis represents the heat retention performance (° C) of the heat insulating container and the horizontal axis represents the ITO particle size (nm). . The scale of the heat retention performance is shown on the left side of the graph. As shown in Graph A, in the case of a heat-insulated container in which the outer surface of the inner container is covered with an ITO film having an average particle diameter of about 50 nm or more, the temperature of the hot water is 60 ° C even after 6 hours. Maintain above. In addition, even if the particle size is larger, the heat retention performance is not proportionally improved. If the particle size is 150 nm or more, the influence of the particle size on the heat retention performance is reduced, and particularly if the particle size is 200 nm or more, the particle size is increased. Thermal insulation performance is almost unchanged. Obedience Therefore, under the conditions of this example, the particle size is preferably 50 nm or more, more preferably 60 ηm or more, and considering the efficiency of sputtering, 200 nm or less is preferable, and considering the efficiency, 150 nm or less is preferable. is there.

[0027] Graph B shows the relationship between the thickness of the ITO film and the particle size, with the vertical axis representing the ITO film thickness (nm) and the horizontal axis representing the ITO particle size (nm) as in Graph A. The graph of the ITO film thickness is shown on the right side of the graph. Note that this straight line is slightly deviated from the actual plot because this straight line is an approximate expression for determining the measured force shown in FIG. 3 of Example 2 described later. According to this graph, a particle size of 50 nm corresponds to a film thickness of approximately 150 nm, a particle diameter of 60 nm corresponds to a film thickness of approximately 200 nm, a particle diameter of 200 nm corresponds to a film thickness of approximately 800 nm, and a particle diameter of 150 nm corresponds to a film thickness of approximately 600 nm. Therefore, when the above particle size condition is expressed in terms of film thickness, the ITO film preferably has a film thickness of 150 nm or more, more preferably 200 nm or more, and considering the efficiency of sputtering, 800 nm or less is more preferable. Therefore, 600 nm or less is preferable.

[0028] From the results of this experiment, the average particle size of the surface particles in the heat insulating container 10 covered with the ITO film formed by ITO ITO sputtering in an atmosphere where the weight ratio of argon to oxygen was 76 to 7. It can be seen that when the typical particle size is 50 nm or more, the heat retention performance of 60 ° C or more is maintained even after 6 hours. It can also be seen that when the thickness of the ITO film is 150 nm or more, the heat retention performance of 60 ° C. or more is maintained even after 6 hours.

Example 2

[0029] In an atmosphere where the weight ratio of argon to oxygen is 76:12, the average particle size (ITO particle size) of the surface particles of the ITO film when ITO is spotted on the outer surface of the inner container 12 is The relationship between the film thickness of the ITO film and the heat insulation performance of the heat insulation container of the finished product including the inner container coated with the ITO film was investigated.

[0030] Graph A in Fig. 3 is a graph showing the relationship between the heat retention performance and the ITO particle size, with the vertical axis representing the heat insulation performance (° C) of the heat insulating container and the horizontal axis representing the ITO particle size (nm). . As in Fig. 2, the scale of thermal insulation performance is shown on the left side of the graph. As shown in graph A, under the conditions different from those in Example 1, even in the case of a heat-insulated container in which the outer surface of the inner container is coated with an ITO film having an average particle diameter of about 50 nm or more, 6 It can be seen that the temperature of the hot water remains above 60 ° C even after the time. In addition, as in Example 1, the heat retention performance is proportionally improved even when the particle size is increased. However, when the particle size is 120 nm or more, the effect of the particle size on the heat retention performance is reduced. Especially when the particle size is 150 nm or more, the heat retention performance is hardly changed even when the particle size is increased. Therefore, under the conditions of this example, the particle size is preferably 50 nm or more, more preferably 60 ηm or more. Considering the sputtering efficiency, 150 nm or less is preferable, and 120 nm or less is preferable. Is preferred.

[0031] Graph B shows the relationship between the ITO film thickness and the ITO particle size, with the vertical axis representing the ITO film thickness (nm) and the horizontal axis representing the ITO particle size (nm) as in Graph A. It is an approximate expression obtained from actual measured values. The scale of the ITO film thickness is shown on the right side of the graph. According to this graph, a particle size of 50 nm corresponds to a film thickness of approximately 150 nm, a particle diameter of 60 nm corresponds to a film thickness of approximately 200 nm, a particle diameter of 120 nm corresponds to a film thickness of approximately 500 nm, and a particle diameter of 150 nm corresponds to a film thickness of approximately 600 nm. Therefore, when the above particle size condition is expressed in terms of film thickness, the ITO film preferably has a film thickness of 150 nm or more, more preferably 200 nm or more, and the efficiency of sputtering is preferably 600 nm or less. And 500 nm or less are suitable.

[0032] From the results of this experiment, the average particle size of the surface particles is 5 in a heat insulating container covered with an ITO film in which ITO is spotted in an atmosphere where the weight ratio of argon to oxygen is 76 to 12. In the case of Onm or higher, it can be seen that the insulation performance of 60 ° C or higher is maintained even after 6 hours. It can also be seen that when the thickness of the ITO film is 150 nm or more, the heat retention performance of 60 ° C. or more is maintained even after 6 hours.

FIG. 4 is an enlarged photograph of the surface of the ITO film. As shown in this photograph, the particles on the surface of the ITO film are not necessarily spherical but also have different sizes. In particular, for example, when the particle size is increased to about 0.2 m, the shape becomes various and elliptical and polygonal, and the size varies as compared with the case where the particle size is about 0.06 μm. In this specification, the average particle diameter of the ITO film surface means the average diameter of particles having an average size as shown in the figure.

[0034] The preferred embodiment of the present invention has been described above, but the present invention is not limited to the above embodiment, and various modifications can be made.

Claims

The scope of the claims

[1] A radiation prevention film is coated on at least one of the outer surface of the glass inner container and the inner surface of the glass outer container, and the inner container is arranged with a gap inside the outer container. In the heat insulating container formed by joining the mouth part of the inner container and the mouth part of the outer container and evacuating and sealing the gap part,

An insulating container, wherein an average particle size of particles on the surface of the radiation preventing film is a predetermined value or more.

[2] At least one of the outer surface of the glass inner container and the inner surface of the glass outer container is covered with a radiation-preventing film, and the inner container is disposed with a gap provided inside the outer container. In the heat insulating container formed by joining the mouth part of the inner container and the mouth part of the outer container and evacuating and sealing the gap part,

An insulating container characterized in that an average particle size of surface particles of at least a portion of the radiation preventing film that is present on a side portion of the insulating container is a predetermined value or more.

[3] The heat insulating container according to claim 1 or 2, wherein the predetermined value is 50 nm.

[4] The heat insulation container according to any one of claims 1 to 3, wherein the radiation prevention film has a thickness of 150 nm or more.

[5] The heat insulating container according to any one of [1] to [4], wherein the radiation preventing film is an ITO film.