JP6240542B2 - How to recycle vacuum insulation - Google Patents

Description

The present invention relates to a method for regenerating a vacuum heat insulating material .

  In recent years, a vacuum heat insulating material with high heat insulating properties is attached to electrical appliances such as buildings and refrigerators. As such a vacuum heat insulating material, an inner bag filled with an inorganic foam powder and a bag-like outer bag covering the periphery of the inner bag are provided, the inside of the outer bag is decompressed by a vacuum pump, and the opening of the outer bag The thing by which the edge part of the side was heat-sealed with the heat-seal machine is proposed. (See Patent Document 1 below).

Japanese Patent Publication No. 02-33918

  Here, the vacuum heat insulating material described in the above-mentioned Patent Document 1 may be deteriorated in heat insulation performance due to a heat seal failure at the time of manufacture or a change over time without maintaining a reduced pressure state in the outer bag. In such a case, it is conceivable to discard the vacuum heat insulating material. However, since the inorganic foamed powder itself and the outer bag itself constituting the vacuum heat insulating material are in a good state, it is desired to reuse these members.

Then, this invention is made | formed in view of the said situation, and provides the reproduction | regenerating method of the vacuum heat insulating material which can reuse a structural member.

In order to achieve the above object, the present invention employs the following means.
That is, in the method for regenerating a vacuum heat insulating material according to the present invention, the core material, the first outer skin material disposed along one surface of the core material, and the other surface of the core material are disposed. A second outer skin material, wherein the first outer skin material and the second outer skin material are formed with a welded portion welded to each other, and on the inner edge side of the welded portion, the first outer skin material and the second outer skin material. A method for regenerating a vacuum heat insulating material in which a non-welded portion is formed by joining two outer skin materials without being welded to each other, wherein the opening is formed by opening the non-welded portion and the opening. A pressure reducing step for reducing the pressure in the space surrounded by the first skin material and the second skin material, and on the inner edge side of the opening in the non-welded portion, the first skin material and the And a welding step of welding the second skin material to each other.

  In the regeneration method of the vacuum heat insulating material configured as described above, the inside of the space surrounded by the first outer skin material and the second outer skin material is decompressed through the opening formed in the non-welded portion. And a 1st outer skin material and a 2nd outer skin material are welded mutually on the inner edge side rather than the opening part in a non-welding part. Accordingly, the vacuum heat insulating material can be easily regenerated by reusing the core material, the first outer skin material, and the second outer skin material.

  Further, in the method for regenerating a vacuum heat insulating material according to the present invention, the first outer skin material and the second outer skin material are formed by bending a single outer skin material so as to face each other with the core material interposed therebetween. The edge portions of the outer skin material facing each other may be the welded portions.

  In the regeneration method of the vacuum heat insulating material configured in this way, one outer skin material is bent to form the first outer skin material and the second outer skin material, and the edges of the opposing outer skin materials are welded together. The vacuum heat insulating material in which the welded portion is formed and the inner edge side of the welded portion is a non-welded portion can be the target of regeneration.

  In the method for regenerating a vacuum heat insulating material according to the present invention, the opening forming step is preferably performed under reduced pressure.

  For example, when the opening is formed in the non-welded part under normal pressure, the core material may be exposed to the atmosphere and adsorb moisture or gas. Furthermore, since the inside of the space surrounded by the first outer skin material and the second outer skin material becomes normal pressure, it takes time to bring the inside of the space into a reduced pressure state again. On the other hand, in the method for regenerating a vacuum heat insulating material according to the present invention, an opening is formed in the non-welded portion under reduced pressure, so that the space surrounded by the first outer skin material and the second outer skin material is in a reduced pressure state in a short time. Can be.

According to the method for regenerating a vacuum heat insulating material according to the present invention, the constituent member can be reused as a vacuum heat insulating material. For example, even when a heat seal failure occurs in the vacuum heat insulating material during manufacturing, the vacuum heat insulating material can be regenerated and reused.

It is a perspective view of the vacuum heat insulating material which concerns on one Embodiment of this invention. (A) It is a perspective view which shows the opening part formation process in the reproduction | regeneration method using the vacuum heat insulating material which concerns on one Embodiment of this invention, (b) It is a perspective view which shows a pressure reduction process, (c) The reproduced | regenerated vacuum It is a perspective view which shows a heat insulating material. (A) It is sectional drawing which follows the AA line of FIG. 1, (b) It is sectional drawing which follows the BB line of FIG. 2 (a), (c) CC line of FIG.2 (b) It is sectional drawing which shows the welding process in. It is a front view of the outer skin material which constitutes (a) vacuum heat insulating material before reproduction used as the object of the reproduction method using the vacuum heat insulating material concerning modification 1 of one embodiment of the present invention, and (b) It is a front view which shows the state bent, (c) It is a front view which shows the state by which the edge part of the outer_shell | collar material was welded, (d) It is a front view which shows the completed state of a vacuum heat insulating material. It is a front view of the outer skin material which constitutes (a) vacuum heat insulating material before reproduction used as the object of the reproduction method using the vacuum heat insulating material concerning modification 2 of one embodiment of the present invention, and (b) It is a front view which shows the state made into the cylinder shape, (c) It is a front view which shows the state by which the outer cover material was bent and the edge part was welded, (d) It is a front view which shows the completed state of a vacuum heat insulating material is there.

The vacuum heat insulating material which is one embodiment of the present invention and a method for regenerating the vacuum heat insulating material will be described.
FIG. 1 is a perspective view of a vacuum heat insulating material according to an embodiment of the present invention.
First, the vacuum heat insulating material will be described.
As shown in FIG. 1, the vacuum heat insulating material 1 includes a core material 2, a first skin sheet (first skin material) 11 and a second skin sheet (second skin material) 12 that cover the core material 2. ing. The vacuum heat insulating material 1 is used in buildings, refrigerators, vending machines, and the like.

  The core material 2 is configured, for example, by accommodating a granular material such as silica in a sheet-like endothelial material (not shown) having good air permeability. In addition, the core material 2 may be glass fiber, foamed resin, or the like.

  In the present embodiment, the core material 2 is formed in a square shape in plan view. One side that is the edge of the core material 2 is defined as an edge 2P, and the side opposite to the edge 2P is defined as an edge 2Q. In addition, a side connecting one end of the edge 2P and one end of the edge 2Q is referred to as an edge 2R, and a side connecting the other end of the edge 2P and the other end of the edge 2Q is referred to as an edge 2S. The shape of the core material 2 is not limited to a square in plan view and can be set as appropriate.

  The first skin sheet 11 is disposed along one surface 2A of the core member 2 (the front side of the paper surface shown in FIG. 1). Further, the second skin sheet 12 is disposed along the other surface 2B of the core member 2 (the back side of the paper surface shown in FIG. 1). That is, the first skin sheet 11 and the second skin sheet 12 are disposed so as to cover the core material 2.

  In the present embodiment, the first skin sheet 11 and the second skin sheet 12 are each formed in a rectangular shape in plan view.

  As a constituent material of the first skin sheet 11 and the second skin sheet 12, a metal sheet such as aluminum or a resin sheet is employed. Further, the first skin sheet 11 and the second skin sheet 12 are respectively welded layers (not shown) that are welded by heat from the core material 2 side to the outside side, and the inside (core core) such as external air or water vapor. The gas barrier layer (not shown) that blocks intrusion into the material 2 side) and a surface protective layer (not shown) that protects the surface are provided at least in a laminated configuration.

  A welded portion 20 welded to each other is formed at the edge of the first skin sheet 11 and the edge of the second skin sheet 12. Further, the space surrounded by the first skin sheet 11 and the second skin sheet 12 is decompressed.

  In the present embodiment, the welded portion 20 includes the long side welded portions 20 </ b> A and 20 </ b> B formed along the long side of the first skin sheet 11 and the long side of the second skin sheet 12, and the short side of the first skin sheet 11. And the short side welding part 20C, 20D formed along the short side of the 2nd skin sheet 12 is comprised.

  The first outer skin sheet 11 and the second outer skin sheet 12 are formed with a non-welded portion 30 that is not welded to each other on the inner edge side of the welded portion 20 and is just brought into contact with each other.

  In the present embodiment, the non-welded portion 30 is a long-side non-welded portion formed between the long-side welded portion 20 </ b> A and the core material 2 (non-welded portion formed along the other portion of the outer edge of the core material 2. ) 30A, a long-side non-welded portion (non-welded portion formed along the other part of the outer edge of the core material 2) 30B formed between the long-side welded portion 20B and the core material 2, and a short-side welded portion Short-side non-welded portion (non-welded portion formed along a part of the outer edge of the core material 2) 30C formed between the portion 20C and the core material 2, the short-side welded portion 20D and the core material 2 And a short-side non-welded part (non-welded part formed along the other part of the outer edge of the core material 2) 30D.

  A boundary portion between the long-side welded portion 20 </ b> A and the long-side non-welded portion 30 </ b> A is an edge portion 20 </ b> P extending along the edge portion 2 </ b> P of the core material 2. Moreover, the boundary part with the long side non-welding part 30B in the long side welding part 20B is made into the edge part 20Q extended so that the edge part 2Q of the core material 2 may be followed. In addition, a boundary portion between the short side welded portion 20 </ b> C and the short side non-welded portion 30 </ b> C is an edge portion 20 </ b> R extending along the edge portion 2 </ b> R of the core material 2. In addition, a boundary portion between the short side welded portion 20 </ b> D and the short side non-welded portion 30 </ b> D is an edge portion 20 </ b> S that extends along the edge portion 2 </ b> S of the core material 2.

  Here, in plan view, the length from the edge 20P of the long-side welded part 20A to the edge 2P of the core material 2 is defined as a width L1. That is, the width of the long-side non-welded portion 30A formed between the long-side welded portion 20A and the core material 2 is defined as a width L1.

  Moreover, in plan view, the length from the edge 20Q of the long-side welded part 20B to the edge 2Q of the core member 2 is defined as a width L2. That is, the width of the long side non-welded portion 30B formed between the long side non-welded portion 30B and the core material 2 is defined as a width L2.

  Further, in plan view, the length from the edge 20R of the short-side welded part 20C to the edge 2R of the core member 2 is defined as a width L3. That is, the width of the short-side non-welded portion 30C formed between the short-side welded portion 20C and the core material 2 is defined as a width L3.

  Further, in plan view, the length from the edge 20S of the short side welded part 20D to the edge 2S of the core material 2 is defined as a width L4. That is, the width of the short-side non-welded portion 30D formed between the short-side welded portion 20D and the core material 2 is defined as a width L4.

  The width L3 is longer than the widths L1, L2, and L4. The width L3 is 3 cm or more, and the details are preferably 5 cm or more from the viewpoint of regenerating the vacuum heat insulating material 1 described later, and preferably 15 cm or less from the viewpoint of material reduction.

Next, the vacuum heat insulating material 1 to be performed when the reduced pressure state in the space surrounded by the first outer skin sheet 11 and the second outer skin sheet 12 of the vacuum heat insulating material 1 configured as described above is not maintained. A reproduction method will be described.
FIG. 2A is a perspective view showing an opening forming step in the regeneration method using the vacuum heat insulating material 1, FIG. 2B is a perspective view showing a decompression step, and FIG. FIG. 3A is a cross-sectional view taken along line AA in FIG. 1, FIG. 3B is a cross-sectional view taken along line BB in FIG. 2A, and FIG. It is sectional drawing which shows the welding process in CC line of 2 (b).

First, as shown in FIG. 2A, the vacuum heat insulating material 1 is put into a chamber (not shown) under reduced pressure and in a reduced pressure atmosphere, and an opening forming step is executed.
In the opening forming step, the welded portion 20C of the first outer skin sheet 11 and the second outer skin sheet 12 is removed by cutting with a cutter (not shown), and the non-welded portion 30 is opened to form the opening K. Specifically, the short-side non-welded portion 30C is cut in parallel to the short-side welded portions 20C and 20D. Thereby, the opening K which opens in parallel with the short side welding part 20D is formed in the short side non-welding part 30C.

  As shown in FIG. 2B and FIG. 3B, the pressure in the space surrounded by the first outer sheet 11 and the second outer sheet 12 is reduced from the opening K in the chamber of the reduced pressure atmosphere. The decompression step is executed. In the decompression step, the space is decompressed using, for example, a vacuum pump.

Next, as shown in FIG.3 (c), a welding process is performed.
In the welding step, the first skin sheet 11 and the second skin sheet 12 are welded to each other using the heat sealer H on the inner edge side of the opening K in the short-side non-welded portion 30C. Thereby, the vacuum heat insulating material 101 by which the new welding part 20X was formed in the inner edge side rather than the short side welding part 20C in the vacuum heat insulating material 1 before reproduction | regeneration is manufactured. In other words, the new welded portion 20X is formed along the cut portions of the first outer skin sheet 11 and the second outer skin sheet 12 so as to seal the opening K.

  In the regeneration method of the vacuum heat insulating material 1 and the vacuum heat insulating material 1 configured as described above, the first outer sheet 11 and the second outer sheet 12 are connected through the opening K formed in the short-side non-welded portion 30C. The pressure in the space surrounded by the first skin sheet 11 and the second skin sheet 12 is reduced. Subsequently, the first outer sheet 11 and the second outer sheet 12 are welded to each other on the inner edge side of the opening K in the short-side non-welded part 30C. And the vacuum heat insulating material 101 in which the new welding part 20X was formed is reproduced | regenerated. Thereby, the core material 2, the 1st skin sheet 11, and the 2nd skin sheet 12 can be reused, and the new vacuum heat insulating material 101 can be manufactured (regenerated).

  Further, in the method for regenerating the vacuum heat insulating material 1 configured as in the present embodiment, the opening K is formed in the first skin sheet 11 and the second skin sheet 12 under reduced pressure. The space surrounded by the two skin sheets 12 can be reduced in pressure in a short time.

  Moreover, the vacuum heat insulating material 1 currently provided in the outer wall etc. can be removed at the time of the regular maintenance of a building, and the new vacuum heat insulating material 101 reproduced | regenerated as shown above can be attached to another outer wall again. Thereby, the heat insulation of a building can be hold | maintained by a simple method.

  Further, the maintenance date can be managed by printing the date on which the vacuum heat insulating material 1 is replaced, for example, on a new welded portion 20X.

In addition, by increasing the length of the width L3 from the welded portion 20 to the core material 2 (preferably 5 cm or more), opening and welding can be repeated a plurality of times. Is possible. In the embodiment described above, the widths L1, L2, L3, and L4 are not all increased, but the width L3 is longer than the widths L1, L2, and L4. Therefore, the areas of the first skin sheet 11 and the second skin sheet 12 around the edges 2P, 2Q, 2S of the core material 2 are smaller than when all of the widths L1, L2, L3, and L4 are increased. , Can reduce material. Moreover, the length of the welding part 20X in a welding process can be shortened rather than the case where all of width L1, L2, L3, L4 is lengthened.
In addition, since the core material 2 forms a square in plan view, the vacuum heat insulating material 1 fits well and is attached to an object having a rectangular shape in plan view (front view).

(Modification 1)
Modification 1 of the embodiment described above will be described mainly with reference to FIG.
Fig.4 (a) is a front view of the outer skin material which comprises the vacuum heat insulating material before the reproduction | regeneration used as the object of the reproduction | regenerating method using the vacuum heat insulating material which concerns on the modification 1 of embodiment shown above. FIG. 4B is a front view showing a state in which the outer skin material is bent. FIG.4 (c) is a front view which shows the state in which the edge part of the outer_layer | skin material was welded. FIG.4 (d) is a front view which shows the completed state of the vacuum heat insulating material before reproduction | regeneration.
In the following modifications, the same members as those used in the above-described embodiment are denoted by the same reference numerals, and the description thereof is omitted.

  In the embodiment shown above, in the vacuum heat insulating material 1 before reproduction, the core material 2 is covered with the first outer sheet 11 and the second outer sheet 12, that is, two outer sheets. As shown in FIG. 4, the core material 2 is covered with a single skin material 210 in the vacuum heat insulating material 201 before regeneration in the first modification.

Hereinafter, the structure of the vacuum heat insulating material 201 before reproduction | regeneration is demonstrated.
As shown in FIG. 4A, the outer skin material 210 is formed in a rectangular shape in plan view. The outer skin material 210 has a pair of long side portions 210A and 210A extending in the longitudinal direction and a pair of short side portions 210B and 210B extending in the short direction.

  As shown in FIG. 4B, the outer skin material 210 is folded back so that the short side portions 210B and 210B are close to each other at the central portion 210M. The central portion 210M is a straight line connecting the approximate centers of the long side portions 210A and 210A.

  One side from the central part 210 </ b> M of the outer skin material 210 constitutes the first outer skin sheet 211. Further, the other side of the center portion 210 </ b> M in the outer skin material 210 constitutes the second outer skin sheet 212.

  As shown in FIG. 4C, the edge portions 211P and 211P along the long side portions 210A and 210A in the first outer skin sheet 211, and the edge portion 212P along the long side portions 210A and 210A in the opposing second outer skin sheet 212. , 212P are welded together. Thereby, edge part 211P, 212P comprises a welding part.

  In this way, the core material 2 is inserted from the short side portions 210B and 210B side in the bag-shaped outer skin material 210 that opens on the short side portions 210B and 210B side.

  As shown in FIG. 4D, the pressure in the outer skin material 210 is reduced, and the edge portion 211Q along the short side portion 210B of the first skin sheet 211 and the edge portion along the short side portion 210B of the second skin sheet 212. 212Q is welded. Thereby, edge part 211Q, 212Q comprises a welding part.

  As described above, in the vacuum heat insulating material 201, the first outer skin material 211 and the second outer skin material 212 are formed so that the single outer skin material 210 is bent and disposed opposite to the core material 2. Moreover, in the vacuum heat insulating material 201, the edge parts 211P, 211Q, 212P, and 212Q are made into the welding part by welding the edge parts of the outer skin | coating material 210 which opposes.

  Further, in the vacuum heat insulating material 201, the first outer skin sheet 211 and the second outer skin sheet 212 are not welded to each other between the edge portion 2R of the core material 2 and the edge portions 211Q and 212Q of the outer skin material 210. A non-welded portion 230 is formed only by contact.

  Moreover, the core material 2 is arrange | positioned so that the edge parts 211P and 212P and the folded-back center part 210M may be contact | connected. Thereby, between the edge part 2P of the core material 2 and the adjacent edge parts 211P and 212P, between the edge part 2Q of the core material 2 and the adjacent edge parts 211P and 212P, and the edge part 2S of the core material 2 No non-welded portion is formed between the central portion 210M or even if a non-welded portion is formed.

  The vacuum heat insulating material 201 configured as described above is formed between the edges 211Q and 212Q welded to the edge 2R among the four edges 2P, 2Q, 2R, and 2S of the core material 2 during reproduction. In the non-welded portion 230, an opening can be formed and welded again.

(Modification 2)
Modification 2 of the embodiment described above will be described mainly with reference to FIG.
Fig.5 (a) is a front view of the outer covering material which comprises the vacuum heat insulating material before the reproduction | regeneration used as the object of the reproduction | regenerating method using the vacuum heat insulating material which concerns on the modification 2 of embodiment shown above. FIG.5 (b) is a front view which shows the state which made the outer covering material cylindrical. FIG.5 (c) is a front view which shows the state which the outer_layer | skin material was bend | folded and the edge part was welded. FIG.5 (d) is a front view which shows the completed state of the vacuum heat insulating material before reproduction | regeneration.

  As shown in FIG. 5, the core material 2 is covered with a single skin material 310 in the vacuum heat insulating material 301 before reproduction in the second modification.

Hereinafter, the structure of the vacuum heat insulating material 301 before reproduction | regeneration is demonstrated.
As shown in FIG. 5A, the skin material 310 is formed in a rectangular shape in plan view. The outer skin member 310 has a pair of long side portions 310A and 310B extending in the longitudinal direction and a pair of short side portions 310C and 310D extending in the short direction.

  As shown in FIG. 5B, the outer skin material 310 is folded at two straight portions 310M and 310N so that the short side portions 310C and 310D are close to each other. The straight portions 310M and 310N are straight lines parallel to the short side portions 310C and 310D.

  A portion between the straight portion 310 </ b> M and the straight portion 310 </ b> N of the outer skin material 310 constitutes the first outer skin sheet 311. Further, a portion between the straight portion 310M and the short side portion 310C and a portion between the straight portion 310N and the short side portion 310D of the outer skin material 310 constitute the second skin sheet 312.

  As shown in FIG.5 (c), the edge part 310P in alignment with the short side parts 310C and 310D in the 2nd outer skin sheet | seat 312 and the edge part 310Q are welded. Thereby, edge part 310P, 310Q comprises a welding part.

  Further, the edge portion 310R along the long side portion 310B of the first outer skin sheet 311 and the edge portion 310S along the long side portion 310B of the second outer skin sheet 312 are welded. Thereby, edge part 310R, 310S comprises a welding part.

  Thus, the core material 2 is inserted from the long and short side portion 310 </ b> A side in the bag-like outer skin material 310 that opens on the long side portion 310 </ b> A side.

  As shown in FIG. 5 (d), the pressure inside the skin material 310 is reduced, and the edge portion 310T along the long side portion 310 </ b> A of the first skin sheet 311 and the edge portion along the long side portion 310 </ b> A of the second skin sheet 312. 310U is welded. Thereby, the edge parts 310T and 310U comprise a welding part.

  As described above, in the vacuum heat insulating material 301, the one outer skin material 310 is bent, and the first outer skin material 311 and the second outer skin material 312 are formed so as to face each other with the core material 2 interposed therebetween. Moreover, in the vacuum heat insulating material 301, the edge parts 310P, 310Q, 310R, 310S, 310T, 310U are made into the welding part by welding the edge parts of the outer skin | coating material 310 which opposes.

  Further, in the vacuum heat insulating material 301, the first outer skin sheet 311 and the second outer skin sheet 312 are not welded to each other between the edge portion 2R of the core material 2 and the edge portions 310T and 310U of the outer skin material 310. A non-welded portion 330 that is merely brought into contact with each other is formed.

  Moreover, the core material 2 is arrange | positioned so that edge part 310R, 310S and linear part 310M, 310N may be contact | connected. Thereby, between the edge 2P of the core material 2 and the straight part 310N, between the edge 2Q of the core material 2 and the straight part 310M, and between the edge 2S of the core material 2 and the edges 310R, 310S. In this case, the non-welded portion is not formed, or even if the non-welded portion is formed, it is very small.

  The vacuum heat insulating material 301 configured in this way is formed between the edge portions 310T, 310U welded to the edge portion 2R among the four edge portions 2P, 2Q, 2R, 2S of the core material 2 at the time of reproduction. In the non-welded portion 330, an opening can be formed and welded again.

  It should be noted that the assembly procedure shown in the above-described embodiment, or the shapes and combinations of the constituent members are examples, and various modifications can be made based on design requirements and the like without departing from the gist of the present invention.

  For example, in the embodiment described above, the opening forming step is performed under reduced pressure, but the present invention is not limited to this. After performing the opening part formation process which forms the opening part K in the vacuum heat insulating material 1 under a normal pressure, you may arrange | position the vacuum heat insulating material 1 in a chamber etc. and may perform a pressure reduction process.

  Moreover, in embodiment shown above, in the opening part formation process, although both the 1st skin sheet 11 and the 2nd skin sheet 12 are cut | disconnected, this invention is not limited to this. A cut (not shown) may be made in only one of the first skin sheet 11 and the second skin sheet 12, or a through hole (not shown) may be opened. In this case, the space surrounded by the first skin sheet 11 and the second skin sheet 12 from the cut or through hole is reduced in pressure, and the non-welded portion is welded again on the inner edge side of the cut or through hole. Can be played.

  Further, in the embodiment shown above, the welded portion 20 where the first skin sheet 11 and the second skin sheet 12 are welded is disposed so as to be positioned at the center in the thickness direction of the core material 2. The invention is not limited to this. The welding part can also be applied to a vacuum heat insulating material arranged close to one side in the thickness direction of the core material 2.

  Moreover, in embodiment shown above, the vacuum heat insulating material 1 provided in the building is removed, and the regenerated new vacuum heat insulating material 101 is attached to another building again, but this invention is limited to this. Absent. For example, the vacuum heat insulating material 1 attached to a used refrigerator or the like can be removed, and a new vacuum heat insulating material 101 regenerated as shown above can be attached to the building again. As described above, the heat insulation property of the object can be ensured by a simple method even when the objects to be attached with the vacuum heat insulating material before and after the reproduction are different as well as the same.

1, 201, 301 ... Vacuum heat insulating material 2 ... Core material 3 ... Skin sheet 11, 211, 311 ... First skin sheet (first skin material)
12, 212, 312 ... second skin sheet (second skin material)
20, 211P, 211Q, 212P, 212Q, 310P, 310Q, 310R, 310S... Welded portion 20A, 20B... Long side welded portion (welded portion)
20C, 20D ... Short side welded part (welded part)
30 ... Non-welded portion 30A, 30B ... Long-side non-welded portion (non-welded portion)
30C, 30D ... Short side non-welded part (non-welded part)
K ... Opening

Claims (3)

A core material, a first skin material disposed along one surface of the core material, and a second skin material disposed along the other surface of the core material, the first skin material and The second outer skin material is formed with a welded portion welded to each other, and the first outer skin material and the second outer skin material are joined together without being welded to each other on the inner edge side of the welded portion. A method for regenerating a vacuum heat insulating material formed with a part,
An opening forming step of opening the non-welded portion to form an opening; and
A decompression step of decompressing the space surrounded by the first outer skin material and the second outer skin material through the opening,
A method for regenerating a vacuum heat insulating material, comprising: a welding step of welding the first outer skin material and the second outer skin material to each other on the inner edge side of the opening in the non-welded portion. In claim 1,
The first outer skin material and the second outer skin material are formed by bending a single outer skin material so as to face each other with the core material interposed therebetween, and the edges of the opposing outer skin materials are welded to each other. The method for regenerating a vacuum heat insulating material according to claim 1, wherein the welding portion is the welded portion. In claim 1 or 2,
The method for regenerating a vacuum heat insulating material, wherein the opening forming step is performed under reduced pressure.

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