JP7264912B2 - Thermal insulation member and manufacturing method thereof - Google Patents

Description

TECHNICAL FIELD The present invention relates to a heat insulating member and a manufacturing method thereof.

2. Description of the Related Art Conventionally, there has been known a heat insulating member composed of a bag-like outer wrapping material made of a laminated film or the like and a core material sealed inside the outer wrapping material in a decompressed state. As a method for manufacturing the heat insulating member, for example, a dry core material is placed inside a bag-like outer wrapping material made of a laminated film or the like, and the inside of the outer wrapping material is decompressed to a substantially vacuum state, and the opening of the outer wrapping material is removed. are heat-sealed and hermetically sealed (see, for example, Japanese Patent No. 3580315).

Japanese Patent No. 3580315

In the method for manufacturing the heat insulating member described above, when sealing the opening of the outer wrapping material, the film forming the outer wrapping material may be locally bent at the sealing portion. This is caused by various factors such as misalignment when positioning the outer wrapping material with respect to the sealing machine for thermal welding to the outer wrapping material, gas flow when decompressing the inside of the outer wrapping material, operation of the sealing machine, etc. This is because misalignment, wrinkles, and the like occur in the sealed portion of the material.

When the film at the sealing portion is bent in this way, the film may not be sufficiently welded at the bent portion, and air may enter the interior of the outer packaging material after sealing. Such intrusion of air reduces the degree of vacuum inside the outer packaging material, resulting in a decrease in the insulation performance of the heat insulating member, or the heat insulating member itself expands or deforms, which can lead to the reliability of the heat insulating member. There were times when the performance was reduced.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to provide a highly reliable heat insulating member.

A method of manufacturing a heat insulating member according to the present disclosure includes the steps of preparing an object to be processed, depressurizing the interior of an outer wrapping material of the object to be processed, and forming a final sealing region. In the step of preparing an object to be processed, an object to be processed is prepared which includes a bag-shaped outer wrapping material having an opening formed therein and a core material arranged inside the outer wrapping material. In the step of forming the final sealing region, the final sealing region is formed so as to separate the interior of the outer wrapping material from the exterior along the opening in the outer wrapping material while the interior of the outer wrapping material is decompressed. . The step of forming the final sealing area is performed in the outer wrapping material with pre-formed auxiliary sealing areas extending along the area where the final sealing area is to be formed.

A heat insulating member according to the present disclosure includes a core material and a bag-like outer wrapping material that holds the core material inside. The inside of the outer wrapping material is decompressed compared to the outside of the outer wrapping material. The outer wrapping material includes a sealing area arranged to surround the core material and an auxiliary sealing area extending along a portion of the sealing area.

According to the above, a highly reliable heat insulating member can be obtained by forming the auxiliary sealing region.

1 is a schematic perspective view of a heat insulating member according to Embodiment 1. FIG. FIG. 2 is a schematic cross-sectional view taken along line II-II in FIG. 1; FIG. 2 is a schematic plan view of the heat insulating member shown in FIG. 1; 2 is a flowchart for explaining a method of manufacturing the heat insulating member shown in FIG. 1; 5 is a schematic plan view for explaining a method of manufacturing the heat insulating member shown in FIG. 4. FIG. 5 is a schematic plan view for explaining a method of manufacturing the heat insulating member shown in FIG. 4. FIG. It is a cross-sectional schematic diagram for demonstrating the manufacturing method of the heat insulating member shown in FIG. FIG. 4 is a schematic perspective view of a heat insulating member as a comparative example of the present embodiment; FIG. 9 is an enlarged schematic cross-sectional view along line segment IX-IX in FIG. 8; FIG. 8 is a schematic plan view of a heat insulating member according to Embodiment 2; FIG. 11 is a schematic cross-sectional view for explaining a method of manufacturing the heat insulating member shown in FIG. 10; FIG. 11 is a schematic plan view of a heat insulating member according to Embodiment 3; 13 is a flow chart for explaining a method for manufacturing the heat insulating member shown in FIG. 12; 14A and 14B are schematic diagrams for explaining a method of manufacturing the heat insulating member shown in FIG. 13; 14A and 14B are schematic diagrams for explaining a method of manufacturing the heat insulating member shown in FIG. 13; 14A and 14B are schematic diagrams for explaining a method of manufacturing the heat insulating member shown in FIG. 13; FIG. 14 is a schematic plan view for explaining a method of manufacturing the heat insulating member shown in FIG. 13; FIG. 14 is a schematic plan view for explaining a method of manufacturing the heat insulating member shown in FIG. 13; 14A and 14B are schematic diagrams for explaining a method of manufacturing the heat insulating member shown in FIG. 13; 14A and 14B are schematic diagrams for explaining a method of manufacturing the heat insulating member shown in FIG. 13; FIG. 11 is a schematic plan view of a heat insulating member according to Embodiment 4; FIG. 22 is a schematic plan view for explaining a method of manufacturing the heat insulating member shown in FIG. 21;

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described below based on the drawings. In the drawings below, the same or corresponding parts are denoted by the same reference numerals, and the description thereof will not be repeated. In the following drawings, the size relationship of each component may differ from the actual size.

Embodiment 1.
<Configuration of heat insulating member>
FIG. 1 is a schematic perspective view of a heat insulating member according to Embodiment 1. FIG. FIG. 2 is a schematic cross-sectional view taken along line II-II in FIG. 3 is a schematic plan view of the heat insulating member shown in FIG. 1. FIG.

The heat insulating member 1 shown in FIGS. 1 to 3 is a vacuum heat insulating material, and includes a core material 2, a bag-like outer wrapping material 3 that holds the core material 2 inside, and an outer wrapping material 3 disposed inside the outer wrapping material 3. and an adsorbent 4. Core material 2 is, for example, an aggregate of glass fibers. The inside of the outer wrapping material 3 is decompressed compared to the outside of the outer wrapping material 3 . The inside of the outer wrapping material 3 is decompressed to about several Pa, for example. The outer wrapping material 3 includes a sealing area 30 arranged to surround the core material 2 and an auxiliary sealing area 6 extending along a final sealing area 8 that is part of the sealing area 30. . The interior of the outer packaging material 3 is hermetically sealed by a sealing region 30 .

In the heat insulating member 1 , the auxiliary sealing region 6 is arranged on the outer peripheral side of the sealing region 30 in the outer wrapping material 3 . The sealing area 30 consists of a first sealing area 3 aa and a final sealing area 8 . The auxiliary sealing area 6 is connected to the sealing area 30 by the second sealing area 3ab. An opening 7 is formed in the outer wrapping material 3 in a region located on the outer peripheral side of the sealing region 30 . The auxiliary sealing regions 6 are arranged so as to sandwich the opening 7 in a direction along the extending direction of the final sealing region 8 which is part of the sealing region 30 .

The core material 2 may be configured, for example, by stacking a plurality of aggregates of glass fibers. By configuring the core material 2 with an aggregate of fibers such as glass fibers in this way, it is possible to suppress heat leakage due to heat conduction of the core material 2 itself. In particular, it is preferable to use, as the above-described fiber assembly, one that has a large proportion of internal space and can maintain the space even after the interior of the outer wrapping material 3 is evacuated. As shown in FIGS. 2 and 3, core material 2 is covered with outer wrapping material 3 . The core material 2 is compressed by the atmospheric pressure through the outer wrapping material 3 when the pressure inside the outer wrapping material 3 is reduced to about several Pa (hereinafter also referred to as a vacuum state). The thickness of the core material 2 before being accommodated in the outer wrapping material 3 is relatively large compared to the thickness of the core material 2 when the inside of the outer wrapping material 3 is in a vacuum state. For example, the thickness of the core material 2 before being housed in the outer wrapping material 3 is the thickness of the core material 2 when the inside of the outer wrapping material 3 is in a vacuum state when the core material 2 is pre-compressed. equal to or more than several times less than In addition, when the core material is not pre-compressed, the thickness of the core material 2 before being accommodated in the outer wrapping material 3 is the number of thicknesses of the core material 2 when the inside of the outer wrapping material 3 is in a vacuum state. More than double and less than several tens of times.

The outer wrapping material 3 may be formed by processing films 5a and 5b having gas barrier properties into a bag shape. The film 5a and the film 5b constitute a sealing region 30 in which the mating surfaces around the core material 2 are fixed by heat welding. The film 5a and the film 5b are shaped like a bag by the sealing region 30. As shown in FIG.

In the following description, the film 5a and the film 5b are collectively referred to as the film 5 as well. Film 5 may be composed of, for example, a laminate film having a multilayer structure. For example, the film 5 may be a multi-layer film body in which a resin film as a heat-sealing layer that is heat-sealed by heating and a metal film as a gas barrier layer that prevents permeation of gas are laminated.

The adsorbent 4 is accommodated in the outer wrapping material 3 together with the core material 2 . The adsorbent 4 may be composed of, for example, a well-ventilated bag and calcium oxide or the like inserted inside the bag. The adsorbent 4 mainly adsorbs moisture inside the outer wrapping material 3 . The adsorbent 4 may be composed of a substance that has adsorption properties for gases other than moisture. The adsorbent 4 may contain a plurality of substances including a substance that adsorbs moisture as described above and a substance that adsorbs other gases. The adsorbent 4 may be arranged inside the core material 2 as shown in FIG. The number of adsorbents 4 may be one as shown in FIG. 2, or may be two or more.

The first sealing region 3aa is arranged along the outer peripheries of the films 5a and 5b and is arranged so as to surround the core material 2 in three directions. The final sealing region 8 is located in one direction of the core material 2 not surrounded by the first sealing regions 3aa, and is arranged so as to connect the ends of the first sealing regions 3aa. The second sealing region 3ab is arranged on the side opposite to the side where the first sealing region 3aa is located when viewed from the end of the final sealing region 8. As shown in FIG. The second sealing region 3ab extends along the peripheries of the films 5a and 5b. The auxiliary sealing region 6 is connected with the second sealing region 3ab. The auxiliary sealing region 6 is arranged along one side of the film 5a and the film 5b extending along the direction in which the final sealing region 8 extends. An opening 7 is arranged so as to be sandwiched between two auxiliary sealing regions 6 . The opening 7 is a region where the films 5a and 5b are not fixed to each other on one side of the peripheral portions of the films 5a and 5b where the auxiliary sealing region 6 is formed.

The sealing region 30 and the second sealing region 3ab are regions in which the portions of the film 5a and the film 5b constituting the outer packaging material 3, which face each other across the space inside the outer packaging material 3, are closely attached and fixed. be. The inside of the outer wrapping material 3 in which the core material 2 is arranged and the outside of the outer wrapping material 3 are separated airtightly by the sealing region 30 . In the auxiliary sealing region 6, parts of the film 5a and the film 5b facing each other across the space inside the outer packaging material 3 are tightly fixed along the region where the final sealing region 8 is to be formed. area. The sealing region 30, the second sealing region 3ab, and the auxiliary sealing region 6 described above are regions where the film 5a and the film 5b are fixed by heat welding, for example. Any method can be adopted as a method for fixing the film 5a and the film 5b.

<Method for manufacturing heat insulating member>
FIG. 4 is a flow chart for explaining a method of manufacturing the heat insulating member shown in FIG. 5 and 6 are schematic plan views for explaining the method of manufacturing the heat insulating member shown in FIG. 7A and 7B are schematic cross-sectional views for explaining a method of manufacturing the heat insulating member shown in FIG. A method of manufacturing the heat insulating member 1 shown in FIG. 1 will be described with reference to FIGS.

As shown in FIG. 4, in the manufacturing method of the heat insulating member 1, first, the outer wrapping material 3 manufacturing step (S10) is carried out. Specifically, the film 5a and the film 5b (see FIG. 2) to be the outer wrapping material 3 are processed into a bag shape to manufacture the outer wrapping material 3 as shown in FIG. As shown in FIG. 5, in the outer packaging material 3, the rectangular films 5a and 5b are laminated, and the peripheral edges of the films 5a and 5b on three sides are thermally welded to form the initial sealing region 3a. do. At the same time, the auxiliary sealing region 6 is formed by heat-sealing both ends of the remaining sides of the film 5a and the film 5b. A portion of one side of the film 5a and the film 5b located between the two auxiliary sealing regions 6 is an opening 7 that is not fixed. The inside and outside of the outer wrapping material 3 are connected through the opening 7 .

Next, the step of inserting the core material (S20) is performed. In this step (S20), the core material 2 is inserted into the outer wrapping material 3 through the opening 7 as shown in FIG.

Next, a drying step (S30) is performed. In this step (S30), an object consisting of the outer wrapping material 3 and the core material 2 housed inside the outer wrapping material 3 is put into a drying oven. The outer wrapping material 3 is composed of the film 5a and the film 5b, part of the periphery of which is sealed by the initial sealing region 3a and the auxiliary sealing region 6, as described above. At this time, the heating temperature in the drying furnace is set to a temperature about 10° C. to 20° C. lower than the lowest melting point of the constituent materials of the respective layers composing the film 5a and the film 5b. This prevents the film 5a and the film 5b from being melted in the drying oven.

In this step (S30), after the core material 2 contained in the outer wrapping material 3 is put into the drying furnace, the outer wrapping material 3 and the core material 2 are held in the drying furnace for several tens of minutes to several hours. Since the inside of the drying furnace is heated to the heating temperature described above, the outer wrapping material 3 and the core material 2 can be dried. As a result, the surface of the film 5 forming the outer wrapping material 3 and the moisture adsorbed to the core material 2 can be separated from the outer wrapping material 3 and the core material 2 . When the moisture adsorbed on the surface of the film 5 and the core material 2 is released inside the outer wrapping material 3 , the moisture is released to the outside of the outer wrapping material 3 through the openings 7 . Therefore, as will be described later, after the vacuum packaging process in which the outer wrapping material 3 is sealed in a state in which the inside of the outer wrapping material 3 is decompressed to a vacuum state, gas such as moisture is released from the core material 2 and the like in the outer wrapping material 3. can be suppressed. That is, it is possible to suppress the heat transfer due to the movement of gas molecules inside the outer wrapping material 3 . As a result, it is possible to prevent the heat insulating property of the heat insulating member 1 from deteriorating.

Next, a step (S40) of placing the object in the vacuum vessel is performed. In this step (S40), the object consisting of the outer wrapping material 3 and the core material 2 is taken out from the drying oven. Then, the object is installed in the vacuum vessel.

Next, an adsorbent insertion step (S50) is performed. In this step ( S<b>50 ), the adsorbent 4 is inserted into the outer packaging material 3 through the opening 7 after placing the object in the vacuum container. The adsorbent 4 may be placed inside the core material 2 or may be placed at the boundary between the core material 2 and the inner surface of the outer wrapping material 3 .

Next, a positioning step (S60) is performed. In this step (S60), the relative placement of the welding sealer 22 with respect to the object is determined. As shown in FIG. 7, the welding sealer 22 is arranged between the auxiliary sealing region 6 and the core material 2 so as to sandwich the region where the final sealing region 8 (see FIG. 3) is to be formed.

Next, a decompression process (S70) is performed. In this process (S70), the pressure inside the vacuum vessel is reduced. As the pressure inside the vacuum container 20 is reduced, the air inside the outer wrapping material 3 is also released from the inside of the vacuum container through the opening 7 . The inside of the vacuum container is decompressed to a pressure for implementing a sealing step (S80) described later. The pressure is about several Pa, for example.

Next, a sealing step (S80) is performed. In this step (S80), the film 5a and the film 5b constituting the outer wrapping material 3 are separated by using the welding sealer 22 installed in the vacuum container while the pressure inside the vacuum container is sufficiently reduced as described above. are heat-sealed to form a final sealing region 8 for sealing. A final sealing area 8 is formed at a position between the auxiliary sealing area 6 and the core material 2 as shown in FIG. As a result, the inside of the outer packaging material 3 is sealed in a vacuum state.

After that, the vacuum container is opened to the atmosphere, and the object having the final sealing region 8 formed thereon is taken out from the vacuum container. The heat insulating member 1 is manufactured through the steps described above.

<Effect>
A heat insulating member 1 according to the present disclosure comprises a core material 2 and a bag-like outer wrapping material 3 that holds the core material 2 inside. The inside of the outer wrapping material 3 is decompressed compared to the outside of the outer wrapping material 3 . The outer wrapping material 3 includes a sealing area 30 arranged to surround the core material 2 and an auxiliary sealing area 6 extending along a final sealing area 8 that is part of the sealing area 30. .

In the heat insulating member 1 , the auxiliary sealing region 6 is arranged on the outer peripheral side of the sealing region 30 in the outer wrapping material 3 . An opening 7 is formed in the outer wrapping material 3 in a region located on the outer peripheral side of the sealing region 30 . The auxiliary sealing regions 6 are arranged so as to sandwich the opening 7 in a direction along the extending direction of the final sealing region 8 which is part of the sealing region 30 .

In this case, by forming the auxiliary sealing region 6 in advance during the manufacture of the heat insulating member 1, the vicinity of the auxiliary sealing region 6 is easily formed when the final sealing region 8 constituting the sealing region 30 described above is formed. It is possible to suppress the occurrence of positional displacement and wrinkles of the film 5 of the outer wrapping material 3 in . Therefore, the occurrence of defective portions in the final sealing region 8 can be suppressed. As a result, the heat insulating member 1 with high reliability can be obtained.

The method for manufacturing the heat insulating member 1 according to the present disclosure includes an outer wrapping material manufacturing step (S10) and a core material inserting step (S20), which are steps of preparing an object to be processed, and the inside of the outer wrapping material 3 in the object to be processed. and a sealing step (S80), which is a step of forming the final sealing region 8 . In the step of preparing an object to be processed, an object to be processed including a bag-shaped outer wrapping material 3 having an opening 7 and a core material 2 arranged inside the outer wrapping material 3 is prepared. In the sealing step (S80) for forming the final sealing region 8, the inside of the outer wrapping material 3 is pushed from the outside of the outer wrapping material 3 along the opening 7 while the pressure inside the outer wrapping material 3 is reduced. A final sealing area 8 is formed so as to be partitioned. In the sealing step (S80) for forming the final sealing region 8, the auxiliary sealing region 6 extending along the region where the final sealing region 8 is to be formed is previously formed in the outer wrapping material 3. be implemented.

In the method for manufacturing the heat insulating member 1 described above, the auxiliary sealing region 6 is formed before the final sealing region 8 is formed. Since the auxiliary sealing region 6 is formed before the core material 2 is put into the outer wrapping material 3, the auxiliary sealing region 6 can be formed while the films 5a and 5b are in close contact with each other. Therefore, the auxiliary sealing region 6 can be formed in a state in which the films 5a and 5b are not misaligned. Therefore, relative displacement of the films 5a and 5b in the direction of the arrow 50 shown in FIG. Therefore, the final sealing region 8 can also be heat-sealed while the displacement between the films 5a and 5b is suppressed. In particular, the displacement of both ends of the final sealing region 8 near the auxiliary sealing region 6 is strongly regulated. Therefore, the occurrence of defects at both ends of the final sealing region 8 can be suppressed. Due to such effects, the reliability of the final sealing region 8 can be improved according to the present embodiment.

Here, FIG. 8 is a schematic perspective view of a heat insulating member 101 as a comparative example of this embodiment. FIG. 9 is an enlarged schematic cross-sectional view taken along line IX-IX in FIG. A heat insulating member 101 as a comparative example shown in FIGS. 8 and 9 basically has the same configuration as the heat insulating member 1 shown in FIG. ing. Since the auxiliary sealing region 6 is not formed, when the films 105a and 105b are welded to form the final sealing region, a part of the film 105a may be partially detached due to misalignment or wrinkling of the film 105a. A bent portion 120 that is welded in a bent state may be formed. Sealing is insufficient at such a bent portion 120 , and air may enter the interior of the heat insulating member 101 via the bent portion 120 . Such intrusion of air causes deterioration of the heat insulating properties of the heat insulating member 101 .

On the other hand, in the heat insulating member 1 according to the present disclosure, since the auxiliary sealing region 6 is formed in advance along the region where the final sealing region 8 is to be formed in the outer wrapping material 3, the final sealing region 8 is The portion of the outer wrapping material 3 in the area to be formed can be constrained by this auxiliary sealing area 6 . Therefore, it is possible to suppress the occurrence of wrinkles and misalignment in the outer wrapping material 3 in the region where the final sealing region 8 is to be formed. As a result, it is possible to reduce the possibility that the film 5 of the outer wrapping material 3 sealed in the final sealing region 8 will be in a state of being locally bent and the sealing will be insufficient. Therefore, it is possible to suppress the occurrence of defects such as deterioration of the heat insulating performance of the heat insulating member 1 and deformation of the heat insulating member 1 due to air entering the inside of the outer wrapping material 3 from the region where the sealing is insufficient. That is, the heat insulating member 1 with high reliability can be provided.

In the method for manufacturing the heat insulating member, the auxiliary sealing regions 6 are arranged so as to sandwich the opening 7 in the direction along which the final sealing region 8 extends. In this case, the final sealing area 8 is formed at a position close to the opening 7. FIG. In addition, since the area between the opening 7 and the final sealing area 8 in the outer wrapping material 3 is connected to the outside of the outer wrapping material 3 through the opening 7, it is used as an inner area in which the core material 2 is arranged. I can't. Therefore, by forming the final sealing region 8 at a position close to the opening 7 as described above, it is possible to reduce the size of the portion that cannot be used as the internal region as described above. As a result, there is no need to make the size of the outer wrapping material 3 excessively large with respect to the size of the core material 2, and an increase in the manufacturing cost of the heat insulating member 1 can be suppressed.

Embodiment 2.
<Configuration of heat insulating member>
10 is a schematic plan view of a heat insulating member according to Embodiment 2. FIG. The heat insulating member 1 shown in FIG. 10 has basically the same configuration as the heat insulating member 1 shown in FIGS. is different from the heat insulating member 1 shown in FIGS. In the heat insulating member 1 shown in FIG. 10 , the auxiliary sealing area 6 is arranged in the outer wrapping material 3 between the core material 2 and the final sealing area 8 which is part of the sealing area 30 . The auxiliary sealing region 6 is formed so as to protrude in the direction in which the final sealing region 8 extends from between the region facing the core material 2 and the region overlapping the final sealing region 8 in the first sealing region 3aa. ing.

<Method for manufacturing heat insulating member>
11A and 11B are schematic cross-sectional views for explaining the method of manufacturing the heat insulating member shown in FIG. A method of manufacturing the heat insulating member 1 shown in FIG. 10 will be described with reference to FIGS. The method for manufacturing the heat insulating member 1 shown in FIG. 10 is basically the same as the method for manufacturing the heat insulating member shown in FIG. However, in the outer wrapping material 3 prepared in the manufacturing step (S10) of the outer wrapping material in FIG. 4, as shown in FIG. It is arranged between the regions where the regions 8 are formed.

After that, steps (S20) to (S50) are performed in the same manner as in the method for manufacturing a heat insulating member according to the first embodiment. Then, in step (S60), the welding and sealing machine 22 is positioned as shown in FIG. As shown in FIG. 11, the welding sealer 22 is arranged so as to sandwich a region of the outer wrapping material 3 opposite to the side where the core material 2 is arranged when viewed from the auxiliary sealing region 6 . In the area sandwiched by the welding sealer 22, that is, the area of the outer wrapping material 3 where the final sealing area 8 is to be formed, the film 5a and the film 5b overlap in a flat state as shown in FIG.

After that, the heat insulating member 1 shown in FIG. 10 can be obtained by performing the step (S70) and the step (S80) of FIG.

<Effect>
In the heat insulating member 1, since the auxiliary sealing region 6 is formed, the same effects as those of the heat insulating member 1 according to the first embodiment can be obtained.

In the method for manufacturing the heat insulating member 1 described above, the auxiliary sealing region 6 is arranged in the outer wrapping material 3 between the core material 2 and the region where the final sealing region 8 is to be formed. In this case, the films 5a and 5b of the outer wrapping material 3, which are arranged so as to sandwich the core material 2, can be fixed by the auxiliary sealing region 6. As shown in FIG. In the region opposite to the side where the core material 2 is positioned when viewed from the auxiliary sealing region 6, the film 5a and the film 5b are laminated as the auxiliary sealing region 6 is formed. Therefore, when forming the final sealing region 8, the film 5a and the film 5b can be easily aligned.

More specific description will be given below. For example, in the method of manufacturing a heat insulating member according to Embodiment 1, films 5a and 5b are slanted between core material 2 and auxiliary sealing region 6 as shown in FIG. A welding sealing machine 22 is arranged so as to sandwich this oblique region. Therefore, when the final sealing step (S80) is performed, that is, when the welding sealing machine 22 is closed, the welding sealing machine 22 comes into contact with the film 5a and the film 5b which are inclined as described above. Then, the welding sealer 22 presses and deforms the films 5a and 5b so that they come into surface contact with each other. At this time, it is conceivable that the film 5a and the film 5b may be distorted and the final sealing region 8 may be wrinkled.

On the other hand, according to the present embodiment, as shown in FIG. 11, the film 5a and the film 5b are constrained by the auxiliary sealing region 6, so that the films 5a and 5b on the peripheral side when viewed from the auxiliary sealing region 6 5b is in a flat and closely adhered state. Since the final sealing region 8 can be formed in the portion of the film 5a and the film 5b that are laminated in a planar shape, the occurrence of wrinkles or the like in the final sealing region 8 can be suppressed, and the final sealing can be performed. The reliability of region 8 can be improved.

Embodiment 3.
<Configuration of heat insulating member>
12 is a schematic plan view of a heat insulating member according to Embodiment 3. FIG. The heat insulating member 1 shown in FIG. 12 basically has the same configuration as the heat insulating member 1 shown in FIGS. It is different from the heat insulating member 1 shown in FIGS. In the heat insulating member 1 shown in FIG. 12, the opening 7 is formed by cutting a part of the outer circumference of the outer wrapping material 3 . The opening 7 is a region in which a part of the outer periphery of the outer wrapping material 3 is recessed in a rectangular shape in plan view, and the two films constituting the outer wrapping material 3 are fixed on the inner peripheral side of the recessed region. It can be opened and closed without

<Method for manufacturing heat insulating member>
13 is a flow chart for explaining a method of manufacturing the heat insulating member shown in FIG. 12. FIG. 14 to 16 are schematic diagrams for explaining the method of manufacturing the heat insulating member shown in FIG. 17 and 18 are schematic plan views for explaining the method of manufacturing the heat insulating member shown in FIG. 13. FIG. 19 and 20 are schematic diagrams for explaining the method of manufacturing the heat insulating member shown in FIG. A method of manufacturing the heat insulating member shown in FIG. 12 will be described with reference to FIGS. 13 to 20. FIG.

First, as shown in FIG. 13, a member preparation step (S110) is performed. In this step (S110), as shown in FIG. 14, core material 2 is placed in a pressing machine for compression, and films 5a and 5b are placed so as to sandwich core material 2 therebetween. The press machine includes a press section 11A and a press section 11B that compress the core material 2 on which the film 5 is arranged. Specifically, the film 5b is arranged on the press section 11B. A core material 2 is arranged on the film 5b. A film 5 a is placed on the core material 2 . The press section 11A is arranged on the press section 11B. The press section 11A can move in the direction indicated by the arrow relative to the press section 11B. Welding and sealing machines 10a and 10b are arranged so as to surround the press sections 11A and 11B.

The film 5a and the film 5b are held by a tension maintaining device (not shown) so as to be planar without slack. As shown in FIG. 14, the lower surface of the core material 2 contacts the upper surface of the film 5b. The upper surface of the core material 2 contacts the lower surface of the film 5a. , is placed on the press section 11B while being sandwiched between the films 5a and 5b. Note that the peripheral edge portions of the films 5a and 5b are not in contact with the core material 2 when the films 5a and 5b are placed on the press portion 11B.

Next, a compression step (S120) is performed. In this step (S120), by operating the press machine, the press section 11A is relatively moved toward the press section 11B, and the core sandwiched between the films 5a and 5b as shown in FIG. Compress material 2. At this time, the film 5a, the film 5b and the core material 2 are compressed until the thickness of the core material 2 becomes approximately equal to the set value of the thickness of the heat insulating member 1 to be manufactured.

Next, the first sealing step (S130) is performed. In this step (S130), as shown in FIG. 15, welding and sealing machines 10a and 10b are used to heat and press the entire periphery of the film 5a and the film 5b, which will be the outer wrapping material 3. As shown in FIG. As a result, the outer peripheries of the films 5a and 5b are heat-sealed with the core material 2 held therein. As a result, the film 5a and the film 5b are welded together at their outer peripheral portions to form a bag-like outer packaging material 3 (see FIG. 16) having an initial sealing region 3a. The above step (S120) and step (S130) may be performed simultaneously, or the step (S130) may be performed after the step (S120) is performed.

Next, a decompression step (S140) is performed. In this step (S140), compression of the outer wrapping material 3 and the core material 2 by the pressing machine is released. Even after the compression is released, the volume of the core material 2 expands (restores) to some extent, but the compressed state is maintained. This is for the following reasons. That is, the volume inside the outer wrapping material 3 increases due to the restoring force of the core material 2, and the air pressure inside the outer wrapping material 3 decreases. Then, when the differential pressure between the atmospheric pressure outside the outer wrapping material 3 and the pressure inside the outer wrapping material 3 is balanced with the restoring force of the core material 2, the restoration of the core material 2 stops.

Next, a step (S150) of placing the object in the vacuum vessel is performed. In this step (S150), an object consisting of the core material 2 and the outer wrapping material 3 in which the core material 2 is arranged is placed inside the vacuum container 20 as shown in FIG. At this time, the object is inserted between a pair of regulation plates 21 installed inside the vacuum vessel 20 . The regulating plates 21 are arranged at predetermined intervals so that an object can be easily inserted and the recovery of the thickness of the core material 2 after cutting the outer wrapping material 3 in the later-described cutting step (S160) can be regulated. there is For example, the distance between the pair of regulating plates 21 may be about 1.5 times to several times the thickness of the object.

Next, a cutting step (S160) is performed. In this step (S160), the outer wrapping material 3 is cut at the cutting position 9 shown in FIG. 17 and unsealed. As a result, an opening 7 is formed in the cut portion as shown in FIG. Further, the portions of the initial sealing region 3a sandwiching the opening 7 become auxiliary sealing regions 6. As shown in FIG. At this time, air flows into the outer wrapping material 3 through the opening 7 and the thickness of the core material 2 is restored.

Next, an adsorbent insertion step (S170) is performed. In this step (S170), as shown in FIG. 19, the adsorbent 4 is inserted into the outer wrapping material 3 through the opening 7 (see FIG. 18).

Next, a positioning step (S180) is performed. In this step (S180), as shown in FIG. 19, the side of the peripheral edge of the outer packaging material 3 having the opening 7 (see FIG. 18) and the auxiliary sealing region 6 formed therein is positioned with respect to the welding sealing machine 22. . The welding sealer 22 is arranged at a position facing the area of the film 5a and the film 5b between the auxiliary sealing area 6 and the core material 2. As shown in FIG.

Next, a decompression step (S190) and a second sealing step (S200) are performed. This step (S190) and step (S200) are the same as the pressure reduction step (S70) and sealing step (S80) shown in FIG. 4, respectively. That is, in the step (S200), the final sealing region 8 is formed by welding the film 5a and the film 5b by the welding sealer 22 in the region between the auxiliary sealing region 6 and the core material 2. . The final sealing region 8 formed by thermal welding in the second sealing step (S200) is formed at a position between the opening 7 and the core member 2, as shown in FIG. Thus, the heat insulating member 1 shown in FIG. 12 can be manufactured.

<Effect>
In the method for manufacturing the heat insulating member, the preparation steps include a member preparation step (S110), which is a step of arranging the films 5a and 5b to be the outer wrapping material 3 so as to sandwich the core material 2, and the films 5a and 5b. A first sealing step (S130), which is a step of forming the initial sealing region 3a in the region surrounding the core material 2, and removing a part of the films 5a and 5b including a part of the initial sealing region 3a , a cutting step (S160), which is a step of forming the openings 7, is included. The auxiliary sealing area 6 is part of the initial sealing area 3a adjacent to the opening 7. As shown in FIG.

In this case, since the core material 2 is already arranged inside the outer wrapping material 3 before forming the opening 7, the core material 2 is inserted into the outer wrapping material 3 through the opening 7. There is no need to make the opening 7 larger than the core material 2. - 特許庁Therefore, the degree of freedom in designing the heat insulating member 1 can be increased, for example, the opening 7 has a size that allows gas to flow when the inside of the outer wrapping material 3 is decompressed.

Further, in the present embodiment, the core material 2 is sandwiched between the films 5a and 5b and compressed, and then the entire periphery (four sides) of the outer wrapping material 3 is sealed using the welding sealers 10a and 10b. ) are heat-sealed by heating and pressurizing. Therefore, the thickness of the core material 2 is thinner than in the case where the outer wrapping material 3 and the core material 2 are arranged in the vacuum vessel 20 and are welded together, and the peripheral edge of the outer wrapping material 3 is formed in a state in which there is almost no slack in the films 5a and 5b. Since the portions are heat-sealed, the initial sealing region 3a can be formed with less displacement than when the heat-sealing is performed within the vacuum vessel 20. FIG. An opening 7 is formed by cutting a part of one side of the outer periphery of the outer wrapping material 3 in which the initial sealing region 3a is formed. A final sealing region 8 is formed between the opening 7 and the core material 2 . Therefore, as in the first embodiment, it is possible to suppress the influence of misalignment of the films 5a and 5b when forming the final sealing region 8, and to form the final sealing region 8 with high reliability. Further, in the present embodiment, the core material 2 can be arranged inside the outer wrapping material 3 without being restricted by the size of the opening 7, so a high-performance vacuum heat insulating material can be easily obtained.

Embodiment 4.
<Configuration of heat insulating member>
21 is a schematic plan view of a heat insulating member according to Embodiment 4. FIG. The heat insulating member 1 shown in FIG. 12 basically has the same configuration as the heat insulating member 1 shown in FIGS. It differs from the heat insulating member 1 shown. In the heat insulating member 1 shown in FIG. 21, slits 19 are formed as openings. The slit 19 is formed by cutting the film of the outer wrapping material 3 . Further, the auxiliary sealing region 6 is formed so as to extend along one side of the outer wrapping material 3 on which the slit 19 is formed.

From a different point of view, in the outer wrapping material 3 , the auxiliary sealing region 6 is arranged on the outer peripheral side of the sealing region 30 . A slit 19 as an opening is formed in a region located on the outer peripheral side of the sealing region 30 in the outer packaging material 3 . The auxiliary sealing region 6 is part of an outer peripheral sealing region 40 that is connected to the sealing region 30 and surrounds the slit 19 that is the opening. The peripheral sealing region 40 is composed of two second sealing regions 3ab connected to the sealing region 30 and an auxiliary sealing region 6 connecting the two second sealing regions 3ab.

<Method for manufacturing heat insulating member>
FIG. 22 is a schematic plan view for explaining a method of manufacturing the heat insulating member shown in FIG. 21. FIG. The method for manufacturing the heat insulating member shown in FIG. 21 is basically the same as the method for manufacturing the heat insulating member shown in FIG. is different from That is, in the method of manufacturing the heat insulating member shown in FIG. 21, as the cutting step (S160), a slit 19 as an opening is formed by cutting a part of the outer wrapping material 3 at the cutting position 9 indicated by the dotted line in FIG. to form Other steps are the same as those of the heat insulating member manufacturing method shown in FIG.

<Effect>
In the heat insulating member 1 , the auxiliary sealing region 6 is arranged on the outer peripheral side of the sealing region 30 in the outer wrapping material 3 . A slit 19 as an opening is formed in a region located on the outer peripheral side of the sealing region 30 in the outer packaging material 3 . The auxiliary sealing region 6 is part of an outer peripheral sealing region 40 that is connected to the sealing region 30 and surrounds the slit 19 that is the opening. In this case, the same effects as those of the heat insulating member 1 according to Embodiment 3 shown in FIG. 12 can be obtained.

In the method for manufacturing the heat insulating member 1, the preparation steps include a member preparation step (S110), which is a step of arranging the films 5a and 5b to be the outer wrapping material 3 so as to sandwich the core material 2, and the films 5a and 5b. In the first sealing step (S130), which is a step of forming the initial sealing region 3a in the region surrounding the core material 2, and the region located between the initial sealing region 3a and the core material 2, the film is cut. and a step of forming an opening by forming the slit 19 (cutting step (S160)). The auxiliary sealing region 6 is part of the initial sealing region 3a located on the opposite side of the core material 2 when viewed from the slit 19, which is the opening. In the second sealing step ( S<b>200 ), which is the step of forming the final sealing region 8 , the final sealing region 8 is formed in the region located between the slit 19 , which is the opening, and the core member 2 .

In this case, a simple method of forming cuts in the films 5a and 5b can be used to form the slits 19, which are the openings. Compared with the case, the steps of the method for manufacturing the heat insulating member 1 can be simplified, and the manufacturing cost of the heat insulating member 1 can be reduced. Moreover, the heat insulating member 1 with high reliability can be obtained in the same manner as in the manufacturing method of the heat insulating member according to the third embodiment.

The embodiments disclosed this time are illustrative in all respects and should not be considered restrictive. The scope of the present invention is indicated by the scope of the claims rather than the above description, and is intended to include meanings equivalent to the scope of the claims and all modifications within the scope.

Reference Signs List 1, 101 heat insulating member, 2 core material, 3 outer wrapping material, 3a initial sealing area, 3aa first sealing area, 3ab second sealing area, 4 adsorbent, 5, 5a, 5b, 105a film, 6 auxiliary sealing stop region 7 opening 8 final sealing region 9 cutting position 10a, 22 welding sealing machine 11A, 11B press part 19 slit 20 vacuum vessel 21 regulation plate 30 sealing region 40 outer peripheral sealing Area, 50 arrow, 120 bend.

Claims (6)

A step of arranging the film to be the outer wrapping material so as to sandwich the core material;
forming an initial sealing region including an auxiliary sealing region in a region surrounding the core material in the film;
forming an opening by forming a slit, which is a cut in the film, in a region located between the initial sealing region and the core material;
A step of placing an object to be processed including the core material and the outer wrapping material in a vacuum vessel;
depressurizing the inside of the outer wrapping material of the object to be processed;
Final sealing is performed between the opening and the core material so as to separate the inside of the outer wrapping material from the outside of the outer wrapping material while the inside of the outer wrapping material is decompressed in the vacuum vessel. and forming a region. a step of preparing an object to be processed including a bag-like outer wrapping material having an opening formed therein and a core material disposed inside the outer wrapping material;
placing the object to be processed in a vacuum vessel;
depressurizing the inside of the outer wrapping material of the object to be processed;
A final sealing region is formed along the opening in the outer wrapping material so as to partition the inner side of the outer wrapping material from the outside of the outer wrapping material while the inner side of the outer wrapping material is decompressed in the vacuum vessel. a step of forming;
In the step of forming the final sealing region, in the outer packaging material, an auxiliary sealing region extending along the region where the final sealing region is to be formed is formed in advance on the outer peripheral side of the final sealing region. A method of manufacturing a heat insulating member that is carried out as it is formed. 3. The method of manufacturing a heat insulating member according to claim 1, wherein said auxiliary sealing regions are arranged so as to sandwich said opening in a direction along the direction in which said final sealing region extends. A sealing region is formed in a region surrounding the core material in the outer wrapping material,
the sealing area includes the final sealing area;
The method for manufacturing a heat insulating member according to any one of claims 1 to 3, wherein the auxiliary sealing area is connected to the sealing area. a core material;
A bag-shaped outer wrapping material that holds the core material inside,
The inside of the outer wrapping material is depressurized compared to the outside of the outer wrapping material,
The outer wrapping material includes a sealing area arranged to surround the core material, and an auxiliary sealing area extending along a part of the sealing area,
In the outer packaging material, the auxiliary sealing region is arranged on the outer peripheral side of the sealing region,
the outer wrapping material includes a final sealing area that is part of the sealing area;
The auxiliary sealing region extends along the extending direction of the final sealing region ,
In the outer packaging material, an opening is formed in a region located on the outer peripheral side of the sealing region,
The auxiliary sealing region is a heat insulating member arranged so as to sandwich the opening in the extending direction of the final sealing region . 6. The heat insulating member according to claim 5 , wherein said opening is formed in a part of the outer circumference of said outer wrapping material .

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