JP2014122693A - Vacuum insulation panel and manufacturing method of the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vacuum insulation panel and a manufacturing method of the vacuum insulation panel which prevents the exposure of the edge of a metal plate material and substantially removes the warpage.SOLUTION: A vacuum insulation panel 10 in which a sealing part 15 is disposed on an outer circumferential part of polygonal first and second metal plate materials 11A, 11B arranged oppositely and a space part 21 in the tightly sealed sealing part 15 is evacuated includes edge part folded-back parts 20 disposed by folding the metal plate materials 11A, 11B on the outer side of the sealing part 15 on respective edges of the metal plate materials 11A, 11B. Further, corner part folded-back parts made by folding the metal plate materials 11A, 11B on an outer side of the sealing part 15 are disposed on respective corners of the metal plate materials 11A, 11B.

Description

  The present invention relates to a vacuum insulation panel and a method for manufacturing the same.

  Patent Document 1 describes a vacuum heat insulating panel in which a spacer is disposed between first and second metal thin plates and a sealing portion is provided on the outer peripheral portion to seal the inside of the space portion. However, this vacuum heat insulation panel has poor workability with respect to handling because the edge of the metal thin plate is exposed at the outer periphery. Moreover, since the corner | angular part warps by the heat | fever at the time of manufacture and when it arrange | positions to a heat insulation target object, the workability | operativity at the time of arrange | positioning to a heat insulation target object is bad.

JP 2002-130583 A

  It is an object of the present invention to provide a vacuum heat insulating panel and a method for manufacturing the same, which can prevent the edge of the metal plate material from being exposed and can substantially eliminate warpage.

  In order to solve the above-mentioned problems, the vacuum heat insulation panel of the present invention is provided with a sealing portion on the outer peripheral portion of the polygonal first and second metal plate members arranged to face each other, and the space in the sealed sealing portion is evacuated. It is a vacuum heat insulation panel, Comprising: It is set as the structure which provided the side part folding | turning part which bent the said metal plate material on the outer side of the said sealing part in each side of the said metal plate material.

  The vacuum heat insulating panel is provided with a sealing portion on the outer peripheral portion of the polygonal first and second metal plate members arranged to seal the space portion, and then the space portion is evacuated and sealed, and the sealing is performed. It is manufactured by bending each side of the metal plate material to form a side folded portion so that a folding line is located outside the stop.

  Since a folded portion is provided on each side of the metal plate material, and a curved portion by folding is positioned on the outer peripheral portion instead of a sharp edge, workability regarding handling can be improved. Further, since the outer peripheral portion is reinforced by providing the folded portion, the rigidity can be increased, and even if warpage occurs, it can be corrected and substantially eliminated. Furthermore, since the extended surface distance can be ensured by the folded-back portion, a temperature decrease due to heat transfer can be prevented, and the heat insulation performance can be enhanced.

  It is preferable to provide a corner folded portion obtained by folding the metal plate material outside the sealing portion at each corner of the metal plate material. In this case, each corner of the metal plate material is provided with a corner folded portion obtained by folding the metal plate material outside the sealing portion, and each side of the metal plate material has a folding curve of the corner folded portion. It is good also as a structure which provides the side part return part which bent the said metal plate material so that a cross | intersection part may be located in the outer side of the said sealing part. The corner folded portion is formed by bending each corner of the metal plate material outside the sealing portion before forming the side folded portion.

  When the corner folded portion and the side folded portion are provided, the folding lines having different inclination angles intersect with each other, so that the intersecting portion is damaged due to metal fatigue or the like and a small hole is generated. Therefore, when the intersecting portion is located in the sealing portion constituting the space portion, a leak occurs and the heat insulation performance is deteriorated. However, in the vacuum heat insulating panel of the present invention, since the intersection of the folding lines of the corner folded portion and the side folded portion is located outside the sealing portion, no leakage occurs even if breakage occurs. Therefore, it can prevent reliably that a vacuum degree falls and heat insulation performance falls.

  It is preferable to provide a chamfered portion at each corner of the metal plate so as to be located outside the sealing portion. If it does in this way, it can prevent that the adjacent side part folding part cross | intersects at a corner | angular part by formation of a side part folding part. The chamfered portion has a line edge portion having a dimension in which the edge of the region where the side portion folded portion is not formed after the side portion turned portion is formed is 5 mm or less. Line edge portions of 5 mm or less are less likely to cause laceration even when the human body is rubbed. A line edge longer than 5 mm belongs to the side forming the side folded portion because there is a high possibility that a tear will occur when the human body is rubbed. Therefore, when the chamfered portion is formed, the corner folded portion is not necessarily formed. In addition, the chamfered portion preferably has a straight edge portion such as a square chamfer, a chamfered chamfer, or a chamfer chamfer, but may be a round chamfer having an arcuate curved edge.

  The side folded portion includes a first side folded portion where the metal plate material is folded outside the sealing portion, and a second side folded portion which is the metal plate material folded inside the sealing portion. Prepare. In this way, the edge of the metal plate can be folded inside. That is, since it is possible to prevent exposure to the surface as well as the outer peripheral edge of the vacuum heat insulating panel, it is possible to further improve workability regarding handling.

  Further, in the space portion, an outer peripheral portion is located on the inner side of the folding line of the side folding portion, and a first core material that extends and bends together along the outer side of the folding curve of the side folding portion, and It is preferable that a second core material disposed on the first core material is disposed, and the side folded portion is bent toward the second core material. If it does in this way, since the 1st core material is located in a side part return part, heat insulation performance in an outer peripheral part is securable. Moreover, since a side part folding | returning part is bend | folded to the 2nd core material side, it can suppress that the wall thickness of the outer peripheral part of a vacuum heat insulation panel becomes thick.

  In the vacuum heat insulation panel of this invention, since the folding | turning part is provided in each edge | side of a metal plate material and the outer peripheral part is made into the curved part by folding, the workability regarding handling can be improved. Further, since the side portion can be reinforced by the folded portion, even if warping occurs, it can be corrected and substantially eliminated. Furthermore, the folding portion can prevent a temperature drop due to heat transfer and enhance the heat insulation performance.

  Moreover, the workability | operativity regarding handling can be improved by providing a folding | turning part in both the corner | angular part and edge | side of a metal plate material. In addition, since the folding lines of the corner folded portion and the side folded portion are crossed outside the sealing portion to prevent leakage, it is possible to prevent a decrease in heat insulation performance.

The top view which shows the vacuum heat insulation panel of 1st Embodiment which concerns on this invention. The center cross-sectional view of FIG. The top view which shows the process structure of a 1st metal plate material. The top view which shows the 1st process of a manufacturing method. The top view which shows the 2nd process of a manufacturing method. The top view which shows the 3rd process of a manufacturing method. The top view which shows the 4th process of a manufacturing method. The top view which shows the 5th process of a manufacturing method. The top view which shows the 6th process of a manufacturing method. (A), (B) is a top view which shows an example of a fixture, (C) is a top view which shows an example of the use condition using a fixture. Sectional drawing which shows the vacuum heat insulation panel of 2nd Embodiment. The top view which shows the vacuum heat insulation panel of 3rd Embodiment. The top view which shows 1 process of the manufacturing method of 3rd Embodiment.

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

(First embodiment)
1 and 2 show a vacuum heat insulation panel 10 according to a first embodiment of the present invention. The vacuum heat insulating panel 10 is formed by joining a pair of metal plate members 11A and 11B, and is a thin shape having a square shape in plan view and a thickness of about 1 to 20 mm. In the present embodiment, the folded portions 19 and 20 are provided on the outer peripheral portion to prevent the edges of the metal plate members 11A and 11B from being exposed, and the warpage generated at each corner and each side is substantially eliminated.

  The vacuum heat insulation panel 10 includes first and second metal plate members 11A and 11B disposed to face each other, and core members 22A to 22C disposed in a space portion 21 therebetween. The space portion 21 is sealed and vacuum evacuated by providing the sealing portion 15 on the outer periphery of the first and second metal plate members 11A and 11B. Each corner is provided with a corner folding portion 19, and each side of the four sides is provided with a side folding portion 20 having a first side folding portion 20A and a second side folding portion 20B.

  Each metal plate material 11A, 11B is formed of a thin stainless steel (SUS304) plate having a thickness of 30 μm to 1 mm. The metal plate members 11A and 11B are not limited to stainless steel but may be a metal plate such as iron or titanium, and can be changed according to the required heat-resistant temperature. Moreover, different metal materials may be used for the first metal plate material 11A and the second metal plate material 11B. Below, the process structure of metal plate material 11A, 11B is demonstrated with reference to FIG. 3 shows the first metal plate member 11A, and the second metal plate member 11B is different only in that an exhaust hole 14 to be described later is not formed.

  As shown in FIG. 3, the metal plate materials 11A and 11B before joining are square, and are cut along cutting lines 12a to 12d shown by broken lines in the drawing after sealing by joining. As a result, as shown in FIG. 4C, a chamfered portion 13 having a chamfered shape cut in a straight line is formed. The chamfered portion 13 has a line edge portion having a dimension in which an edge of a region (a gap S described later) where the side portion folded portion 20 is not formed after the side portion turned portion 20 is formed is 5 mm or less. Further, the chamfered portion 13 may be composed of only a straight edge such as a chamfered chamfer or a padded chamfer instead of a square chamfer, or may be a round chamfer having an arcuate curved edge. Exhaust holes 14 are provided outside the single cut line 12a. The exhaust holes 14 are formed only in the first metal plate material 11A, and are not formed in the second metal plate material 11B.

  The metal plate materials 11A and 11B are sealed (sealed portion 15) along the sealing lines 15a to 15h indicated by the one-dot chain line in FIG. The sealing lines 15a to 15d are positioned on the inner side with a predetermined interval with respect to the cutting lines 12a to 12d, and the sealing lines 15e to 15h are on the inner side with a predetermined interval with respect to each edge (straight edge). To position. Among these, the sealing lines 15e and 15f extend linearly to the outside of the exhaust hole 14 so that the ends of each other intersect. The other ends of the sealing lines 15e and 15f and both ends of the sealing lines 15g and 15h extend to both ends of the sealing lines 15a to 15d. The sealing lines 15b to 15h except the sealing line 15a are sealed before evacuation, and the sealing line 15a is sealed after evacuation. Sealing is performed by pressure bonding such as seam welding, butt welding such as TIG welding, MIG brazing, or the like.

  The metal plate members 11A and 11B are bent along folding lines 16a to 16d, 17a to 17d, and 18a to 18d shown by two-dot chain lines in FIG. 3, and are plastically deformed into a bent state. The corner folding lines 16a to 16d are located outside the sealing lines 15a to 15d at a predetermined interval and extend to the respective edges of the metal plate members 11A and 11B. The first side folding lines 17a to 17d are located outside the sealing lines 15e to 15h at a predetermined interval, and extend to the corner folding lines 16a to 16d. The second side folding curves 18a to 18d are located inside at a predetermined interval with respect to the sealing lines 15e to 15h. Further, the second side folding lines 18a to 18d extend over the corner folding lines 16a to 16d beyond the sealing lines 15a to 15d without crossing each other.

  Information such as the positions and dimensions of the cutting lines 12a to 12d, the sealing lines 15a to 15h, the corner folding curves 16a to 16d, the first side folding curves 17a to 17d, and the second side folding curves 18a to 18d are processed. It is input to the equipment control device.

  By bending along the corner folding lines 16a to 16d, corner turn-back portions 19 that are bent outside the sealing lines 15a to 15d are formed at the respective corners of the metal plate members 11A and 11B. By bending along the first and second side folding curves 17a to 17d and 18a to 18d, at each side of the metal plate members 11A and 11B, the intersections with the corner folding curves 16a to 16d are sealed lines 15a. The side folding | returning part 20 bend | folded so that it may be located outside -15d is formed. The side part folding part 20 includes a first side part folding part 20A that is folded outside the sealing lines 15e to 15h, and a second side part folding part 20B that is folded inside the sealing lines 15e to 15h. A region between each of the four side edges and the first side folding curves 17a to 17d constitutes the first side folding portion 20A. A region between the first side folding curves 17a to 17d and the second side folding curves 18a to 18d constitutes the second side folding portion 20B.

  Between the first and second metal plate members 11A and 11B, a space portion 21 is formed inside the sealing lines 15a to 15h. In the space portion 21, the core materials 22A to 22C, the metal foils (copper foils) 23A and 23B for preventing radiant heat transfer, and the gas generated after sealing are sucked to maintain the degree of vacuum. Getters (not shown).

  The core materials 22A to 22C have an octagonal shape in which each corner is chamfered, and a woven or non-woven fabric such as glass fiber, ceramic fiber, or carbon fiber, mica plate, ceramic wool, ceramic board, or the like is used. The outer peripheral portion of the first core material 22A is located outside the second side folding lines 18a to 18d and inside the sealing lines 15a to 15d. That is, when the metal plate members 11A and 11B are bent along the second side folding lines 18a to 18d, the dimension is set to be bent together. The outer peripheral portion of the second core material 22B is located inside the second side folding lines 18a to 18d. That is, even if it bend | folds by each folding line 16a-16d, 17a-17d, 18a-18d, it is the dimension setting which is not bent. The outer peripheral portion of the third core material 22C is located further inside than the outer peripheral portion of the second core material 22B. And it is the dimension setting located inside the inner edge in the state which bent side part folding | returning part 20A, 20B along the 1st and 2nd side folding curves 17a-17d, 18a-18d.

  As shown in FIG. 2, the metal foil 23A is formed with the same dimensions as the core material 22B, and the metal foil 23B is formed with the same dimensions as the core material 22C. These metal foils 23A and 23B are arranged in a state of being sandwiched between the core materials 22A to 22C. Specifically, the core material 22A, the metal foil 23A, the core material 22B, the metal foil 23B, and the core material 22C are laminated in this order from below. Then, for example, the jig is penetrated and the fibers of the core materials 22A to 22C are partially entangled so as to be integrated and arranged integrally.

  Next, the manufacturing method of the vacuum heat insulation panel 10 is demonstrated.

  As shown in FIG. 4A, the second metal plate material 11B is arranged, and the core materials 22A to 22C, the metal foils 23A and 23B, and the getter integrated thereon are arranged thereon. Next, as shown in FIG. 4B, after the first metal plate material 11A is arranged on the core material 22C, the metal plate materials 11A and 11B are joined along the sealing lines 15b to 15h to seal the space portion 21. In this state, a well-known exhaust device is connected to the exhaust hole 14 and the space 21 is evacuated to a predetermined degree of vacuum. When the specified vacuum degree is reached and it is confirmed that there is no leak, the exhaust hole 14 is sealed. Next, as shown in FIG. 4C, after joining the inside of the exhaust hole 14 along the sealing line 15 a to seal the space portion 21, each corner of the metal plates 11 </ b> A and 11 </ b> B along the cutting lines 12 a to 12 d. Is cut (chamfered).

  Next, as shown in FIG. 4D, after the corner folding portion 19 is bent along the corner folding lines 16 a to 16 d, the first side folding curves 17 a to 17 d are taken along the first side folding curves 17 a to 17 d as shown in FIG. 4E. The side folded portion 20A is bent. Under the present circumstances, each folding | turning part 19 and 20A bend | folds to the upper side which has arrange | positioned core material 22A-22C. Further, the first metal plate material 11A located on the upper side is bent to a position where it is folded. Finally, as shown in FIG. 4F, the second side folded portion 20B is bent upward along the second side folding curves 18a to 18d. At this time, the second metal plate member 11B of the second side folded portion 20B and the first metal plate member 11A on the space 21 are bent to a flat position. Thereby, the vacuum heat insulation panel 10 shown in FIG. 1 and FIG. 2 is formed.

  Since the vacuum heat insulation panel 10 manufactured in this manner is provided with the folded portions 19, 20A, 20B at the respective corners and sides of the metal plate members 11A, 11B, the outer peripheral portion is not a sharp edge but a curved portion by folding. To do. Therefore, an operator does not suffer a laceration at a sharp edge, and workability regarding handling can be improved. Moreover, since the side part is reinforced by providing the folding | turning parts 19 and 20, rigidity can be improved. And even if the warp is generated by the heat at the time of evacuation, it can be corrected and substantially eliminated. Furthermore, since the extended surface distance in an outer peripheral part can be ensured by the folding | turning parts 19 and 20, the temperature fall by heat transfer can be prevented and heat insulation performance can be improved.

  Moreover, since the chamfered portion 13 and the corner folded portion 19 are formed at the corner portions of the metal plate members 11A and 11B, it is possible to prevent the adjacent side portion folded portions 20 and 20 from intersecting at the corner portions. Furthermore, as for the vacuum heat insulation panel 10, the cross | intersection part of each folding line 16a-16d and 18a-18d of the corner | angular part folding | turning part 19 and the side part folding | turning part 20B is located in the outer side of sealing line 15a-15h. Therefore, no leakage occurs even if metal fatigue damage or the like is caused by processing. Therefore, it can prevent reliably that a vacuum degree falls and heat insulation performance falls.

  Further, the first side folding portion 20A is folded at the outside of the first side folding curves 17a to 17d, and the second side folding is folded at the inside of the second side folding curves 18a to 18d. It consists of the part 20B. Therefore, since the edges of the metal plate materials 11A and 11B can be prevented from being exposed not only to the outer peripheral portion of the vacuum heat insulating panel 10, but also to the surface, workability regarding handling can be further improved.

  And since the 1st core material 22A is located in the side part folding | turning part 20, core material 22A-22C can ensure the heat insulation performance in an outer peripheral part. Moreover, since the 2nd core material 22B is located inside the folding curves 18a-18d for 2nd sides, it can suppress that the thickness of the outer peripheral part of the vacuum heat insulation panel 10 becomes thick. Moreover, since the 3rd core material 22C is the dimension setting located inside the bent side part folding | turning part 20, it can be set as a substantially flat finishing state.

  In the corner portion of the vacuum heat insulating panel 10 of the present embodiment, for example, a gap S corresponding to the intersection between the corner folding curve 16a and the second side folding curves 18a and 18d is formed. Therefore, it can be mounted on the wall surface of a predetermined heat insulation object by the mounting jigs 30A and 30B using the gap S (the chamfered portion 13).

  Specifically, as shown in FIGS. 5A and 5B, the mounting jigs 30 </ b> A and 30 </ b> B are arranged in a space surrounded by corners when a large number of vacuum heat insulating panels 10 are arranged side by side. The fixed part 31 is provided. In other words, the chamfered portion 13 and the gap S of the vacuum heat insulating panel 10 are adjusted in consideration of the size required for the fixing portion 31. The fixing portion 31 is formed with an insertion hole 32 for inserting a screw or the like. In addition, the fixed portion 31 is integrally provided with a connecting portion 33 that is disposed from the gap S into the second side folded portion 20B. The attachment jig 30A shown in FIG. 5A is provided with four connecting portions 33, and the four vacuum heat insulation panels 10 are positioned and arranged. The attachment jig 30B shown in FIG. 5B is provided with two connecting portions 33, and the two vacuum heat insulation panels 10 are positioned and arranged. By using these mounting jigs 30A and 30B, the thin plate-like vacuum heat insulation panel 10 can be arranged and arranged as shown in FIG.

(Second Embodiment)
FIG. 6 shows the vacuum heat insulation panel 10 of the second embodiment. In the second embodiment, when the side folded portion 20 is bent along the second side folding curves 18a to 18d, the second metal plate member 11B is inclined inward from the lower side to the upper side. The vacuum heat insulation panel 10 thus configured is insulated by arranging the side where the side folded portion 20 is bent on the side of the object to be insulated and placing the flat side (second metal plate 11B side) on the atmosphere side. A heat insulating space can be formed between the object and the object. Therefore, the heat insulation performance can be further improved.

(Third embodiment)
7A and 7B show a vacuum heat insulation panel 10 of the third embodiment. In the third embodiment, the chamfered portion 13 is formed so as to be located outside the sealing portion 15 as in the respective embodiments, but the corner folded portion 19 is not provided. It differs from the form. Moreover, the side part folding | returning part 20 is different from each embodiment by the point comprised only by the 1st side part folding | turning part 20 bent on the outer side of the sealing part 15. FIG.

  As in the first embodiment, the chamfered portion 13 has a line edge portion having a dimension in which the cutting edge of the region (gap S) where the side portion folded portion 20 is not formed is 5 mm or less. A line edge of 5 mm or less is less likely to cause laceration even when the human body is rubbed, and a line edge longer than 5 mm is likely to cause laceration when the human body is rubbed. Therefore, the line edge part (chamfer part 13) longer than 5 mm belongs to a polygonal side forming the side part folded part 20. That is, when the chamfered portion 13 is formed at the corners of the metal plate materials 11A and 11B, the corner folded portion 19 may not be formed. Further, side folding curves 17a to 17d (17c is not shown in FIG. 7B) for forming the side folding portion 20 are located outside the sealing portion 15 and extend to the chamfered portions 13 on both sides. Is provided.

  Since the vacuum heat insulation panel 10 of this 3rd Embodiment forms the chamfering part 13 in the corner | angular part of metal plate material 11A, 11B, the adjacent side part folding | returning parts 20 and 20 cross | intersect similarly to each embodiment. Can be prevented. Moreover, the side part folding | turning part 20 is formed in each edge | side which consists of a line edge part longer than 5 mm, and the folding | turning parts 19 and 20 are not formed in the chamfering part 13 which consists of a 5 mm or less linear edge part. For this reason, it is possible to obtain similar actions and effects, such as improvement in workability regarding handling, while preventing the generation of laceration even when the human body is rubbed during handling.

  In addition, the vacuum heat insulation panel 10 of this invention and its manufacturing method are not limited to the structure of the said embodiment, A various change is possible.

  For example, when the corner folded portion 19 is formed as in the first and second embodiments, the side folded portion 20B is provided so that the intersection with the corner folded portion 19 is located outside the sealing portion 15. In this case, the side portion folding portion 20 </ b> A that is bent outside the sealing portion 15 may be omitted.

  Moreover, in 1st and 2nd embodiment, you may comprise only the 1st edge | side part folding | turning part 20 similarly to 3rd Embodiment. Furthermore, in 3rd Embodiment, although comprised only with the 1st side part folding | returning part 20, it comprised by a pair of 1st and 2nd side part folding | turning parts 20A and 20B similarly to 1st and 2nd embodiment. Also good. And when providing only the 1st edge part folding | returning part 20, it is good also as a structure formed not only in the structure formed after the corner | angular part folding | turning part 19, but first.

  Moreover, although the vacuum heat insulation panel 10 of the said embodiment was formed in square shape, it may be triangular shape and pentagon shape, and should just be made into polygonal shape. Furthermore, in the said embodiment, although it was set as the structure which cut | disconnects the corner | angular part of metal plate material 11A, 11B, forms the chamfering part 13, and forms the corner | angular part folding | turning part 19, it is for corners without providing the chamfering part 13. It is good also as a structure which bends along the folding lines 16a-16d, and forms the corner | angular part folding | turning part 19. FIG.

DESCRIPTION OF SYMBOLS 10 ... Vacuum heat insulation panel 11A, 11B ... 1st and 2nd metal plate material 12a-12d ... Cutting line 13 ... Chamfering part 14 ... Exhaust hole 15 ... Sealing part 15a-15h ... Sealing line 16a-16d ... Corner folding Curves 17a to 17d ... First side folding curves 18a to 18d ... Second side folding curves 19 ... Corner part folding part 20 ... Side part folding part 20A, 20B ... First and second side folding parts 21 ... Space part 22A-22C ... Core material 23A, 23B ... Metal foil 30A, 30B ... Mounting jig 31 ... Fixed part 32 ... Insertion hole 33 ... Connection part

Claims (8)

A vacuum insulation panel in which a sealing portion is provided on the outer peripheral portion of the polygonal first and second metal plate members arranged to face each other, and a space portion in the sealed sealing portion is evacuated,
The vacuum heat insulation panel characterized by providing the side part folding | turning part which bent the said metal plate material on the outer side of the said sealing part in each edge | side of the said metal plate material.   The vacuum heat insulation panel according to claim 1, wherein a corner folded portion obtained by folding the metal plate material outside the sealing portion is provided at each corner of the metal plate material. A vacuum insulation panel in which a sealing portion is provided on the outer peripheral portion of the polygonal first and second metal plate members arranged to face each other, and a space portion in the sealed sealing portion is evacuated,
In each corner of the metal plate material is provided with a corner folded portion that is bent from the metal plate material outside the sealing portion, and
Each side of the metal plate material is provided with a side folded portion that is a folded portion of the metal plate material so that an intersection with the folding line of the corner folded portion is located outside the sealing portion. Vacuum insulation panel.   The vacuum heat insulation panel according to any one of claims 1 to 3, wherein a chamfered portion is provided at each corner of the metal plate so as to be positioned outside the sealing portion.   The side folded portion includes a first side folded portion where the metal plate material is folded outside the sealing portion, and a second side folded portion which is the metal plate material folded inside the sealing portion. The vacuum heat insulation panel according to any one of claims 1 to 4, wherein the vacuum heat insulation panel is provided. A first core material that has an outer peripheral portion extending outside the folding line of the side folding portion and bent together inside the space portion, and an outer circumferential portion located on the inner side of the folding curve of the side folding portion. A second core material disposed on the core material,
The vacuum heat insulation panel according to any one of claims 1 to 5, wherein the side folded portion is bent toward the second core material. After sealing the space portion by providing a sealing portion on the outer peripheral portion of the polygonal first and second metal plate members arranged opposite to each other, the inside of the space portion is evacuated and sealed,
A method for manufacturing a vacuum heat insulating panel, wherein the sides of the metal plate material are bent so as to be positioned outside the sealing portion to form a side folded portion.   The manufacturing method of the vacuum heat insulation panel according to claim 7, wherein the corner folded portion is formed by bending each corner of the metal plate material outside the sealing portion before forming the side folded portion. Method.

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