JP2006170303A - Vacuum heat insulating material - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To use thick cores material without increasing a distance between the cores adjacent to each other in a vacuum heat insulating material formed by depressurizingly sealing a plurality of core materials in their respective independent spaces by heating and pressurizing the core materials and the core materials held between covering materials. <P>SOLUTION: The plurality of core materials 12 are covered by the gas-barrier covering materials 13 formed of a laminated film, and the insides of the covering materials 13 are depressurized and sealed. The plurality of core materials 12 are disposed at specified intervals in a lattice shape, and heated and pressurized also in such a case that the core materials 12 are held between the covering materials 13 to form the thermally molten parts 14 of the covering materials 13 around the core materials 12. The plurality of core materials 12 are independently disposed in the independent spaces. The density of the outer peripheral part of the core materials 12 is set lower than that of the center part thereof to chamfer the angle thereof in contact with the covering materials 13. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a vacuum heat insulating material in which a plurality of core materials are sealed under reduced pressure in independent spaces.

  As a conventional vacuum heat insulating material in which a plurality of core members are sealed under reduced pressure in independent spaces, there is one disclosed in Patent Document 1.

  Hereinafter, the conventional vacuum heat insulating material will be described with reference to the drawings.

  8 is a cross-sectional view of a conventional vacuum heat insulating material, FIG. 9 is a plan view of the conventional vacuum heat insulating material, and FIG. 10 is a conceptual diagram showing a vacuum sealing process of the conventional vacuum heat insulating material.

  A conventional vacuum heat insulating material 1 is formed by covering nine plate-like core materials 2 having a thickness of about several millimeters with a gas barrier outer covering material 3 and sealing the inside of the outer covering material 3 under reduced pressure. The core material 2 is arranged in a lattice shape and spaced apart from each other by a predetermined distance so that the vertical and horizontal folding lines 1a and 1b can be formed, and the core material 2 is between the jacket materials 3 The core material 2 is provided with the heat welded portion 4 around the core material 2, and each of the nine core materials 2 is located in an independent space.

  Next, the manufacturing method of the conventional vacuum heat insulating material 1 is demonstrated.

  First, nine core members 2 and a jacket member 3 that covers the core members 2 from above and below are installed inside the chamber 5. Then, the air inside the chamber 5 is exhausted by a connected vacuum pump 6, and after reaching a predetermined internal pressure, is sandwiched between elastically deformable hot plates 7 that are arranged inside the chamber 5 and move up and down by a pressing device 8. The vacuum heat insulating material 1 is obtained by heat-welding the entire surface of the jacket material 3.

Since this vacuum heat insulating material 1 can bend the vacuum heat insulating material 1 in two directions, there are few restrictions on the shape of the object to be applied, and the usage is wide. Moreover, even if the vacuum degree of the space containing the specific core material 2 is lowered, the vacuum degree of the space containing the other core material 2 is not lowered, and the deterioration of the heat insulation performance is minimized. Can be suppressed.
JP 2004-197935 A

  However, the conventional manufacturing method of the vacuum heat insulating material 1 is not suitable for the thick core material 2, and when the thick core material 2 is used for improving the heat insulating performance, the interval between the adjacent core materials 2 is set. When the gap between adjacent core members 2 is increased, the effective heat insulation area is reduced. Therefore, there is a problem that the heat insulation performance is not good for the thickness.

  In view of the above-described conventional problems, the present invention provides a vacuum heat insulating material in which a plurality of core materials are vacuum-sealed in independent spaces by heating and pressurizing including a portion where the core material is located between the jacket materials. An object of the present invention is to make it possible to use a thick core material without widening the interval between the core materials to be performed.

  In order to achieve the above object, in the vacuum heat insulating material of the present invention, the core material is chamfered by making the density at the outer peripheral portion of the core material lower than the center portion. Further, the core material is constituted by a first core material located in a central portion and a second core material arranged on an outer peripheral portion of the first core material, and the second core material is defined as the first core material. The core material is chamfered by lowering the density or reducing the thickness of the core material.

  Thus, in a vacuum heat insulating material in which a plurality of core materials are vacuum-sealed in independent spaces by heating and pressurizing including a portion where the core material is between the jacket materials, the interval between adjacent core materials is widened. A thick core material can be used without increasing the heat insulation performance.

  The vacuum heat insulating material of the present invention is a vacuum heat insulating material in which a plurality of core materials are sealed under reduced pressure in independent spaces by heating and pressurizing the portions including the core material between the outer cover materials. Since the corner of the core material on the side close to the adjacent core material is chamfered out of the corners of the core material to be contacted, the core material can easily correspond to the shape and arrangement of a plurality of core materials, and the core material is not chamfered Compared to the one using the above, it becomes possible to narrow the interval between adjacent core members or increase the thickness of the core member, and to improve the heat insulating performance of the vacuum heat insulating material.

  The invention of the vacuum heat insulating material according to claim 1 is formed by covering a plurality of plate-shaped core members with a gas barrier outer cover material and sealing the inside of the outer cover member under reduced pressure, and the plurality of core members are mutually connected. A plurality of the outer cover materials are provided around the core material by heat and pressure including a portion where the core material is located between the outer cover materials. Each of the core materials is a vacuum heat insulating material located in an independent space, and the core material is chamfered by making the density at the outer peripheral portion of each core material lower than the center portion. In the vacuum heat insulating material in which a plurality of core materials are vacuum-sealed into independent spaces by heating and pressing including a portion where the core material is present between the jacket materials, the corners of the core material contacting the jacket material are Since the corner of the core material on the side closest to the adjacent core material is chamfered, the jacket material It becomes easy to correspond to the shape and arrangement of multiple core materials, and it is possible to narrow the interval between adjacent core materials and increase the thickness of the core material compared to those using non-chamfered core materials. Thus, the heat insulating performance of the vacuum heat insulating material can be enhanced. Moreover, since the density in the outer peripheral part of each core material is lower than that in the central part, chamfering is naturally performed during heating and pressurization, so that chamfering after the core material is not necessary and productivity is improved.

  The invention of the vacuum heat insulating material according to claim 2 is formed by covering a plurality of plate-shaped core members with a gas barrier outer cover material and sealing the inside of the outer cover member under reduced pressure. A plurality of the outer cover materials are provided around the core material by heat and pressure including a portion where the core material is located between the outer cover materials. Each of the core materials is a vacuum heat insulating material located in an independent space, and each of the core materials is a first core material located in a central portion, and the density is lower than that of the first core material. The core material is chamfered by being configured with a second core material arranged on the outer peripheral portion of the first core material, and includes a portion where the core material is located between the jacket materials. In a vacuum heat insulating material in which a plurality of core materials are sealed under reduced pressure in independent spaces by heating and pressurizing, they contact a jacket material. Since the corner of the core material on the side close to the adjacent core material is chamfered among the corners of the material, the outer cover material can easily correspond to the shape and arrangement of a plurality of core materials, and a core material that is not chamfered is used. Compared to those, it is possible to narrow the interval between adjacent core members or to increase the thickness of the core member, and to improve the heat insulating performance of the vacuum heat insulating material. Further, the core material is constituted by a first core material located in a central portion and a second core material arranged on an outer peripheral portion of the first core material, and the second core material is defined as the first core material. Because it has a lower density than the core material, it is chamfered naturally during heating and pressurization, so not only chamfering after core material preparation is necessary, but also the second core material is reused of end material Therefore, the yield can be suppressed.

  The invention of the vacuum heat insulating material according to claim 3 is formed by covering a plurality of plate-shaped core members with a gas barrier outer cover material and sealing the inside of the outer cover material under reduced pressure, and the plurality of core members are mutually connected. A plurality of the outer cover materials are provided around the core material by heat and pressure including a portion where the core material is located between the outer cover materials. Each of the core materials is a vacuum heat insulating material located in an independent space, and each of the core materials is a first core material located in a central portion, and the thickness is smaller than that of the first core material. The core material is chamfered by being configured with a second core material arranged on the outer peripheral portion of the first core material, and includes a portion where the core material is located between the jacket materials. A vacuum insulation material that seals a plurality of core materials in a separate space by heating and pressurizing, and abuts against the jacket material. Since the corners of the core material on the side close to the adjacent core material are chamfered among the corners of the core material to be coated, it becomes easier for the jacket material to correspond to the shape and arrangement of a plurality of core materials, and the core material that is not chamfered Compared to the one used, it is possible to narrow the interval between adjacent core members, or increase the thickness of the core member, thereby enhancing the heat insulating performance of the vacuum heat insulating material. Further, the core material is constituted by a first core material located in a central portion and a second core material arranged on an outer peripheral portion of the first core material, and the second core material is defined as the first core material. Since the core is chamfered by making the thickness smaller than that of the core material, not only chamfering after core material preparation is necessary, but all core materials need only be designed with the same density, so the density of the core material Productivity is improved because no control is required.

  Next, the constituent materials of the vacuum heat insulating material will be described in detail.

  The core material can withstand the heat at the time of thermal welding of the jacket material, and has a high porosity, preferably a porosity of 80% or more, more preferably a porosity of 90% or more. There are powders, fiber bodies, and the like that can be used industrially, and any material is used depending on the intended use and required characteristics.

  As the powder, inorganic, organic, and a mixture thereof can be used, but industrially, those mainly composed of dry silica, wet silica, pearlite and the like can be used.

  In addition, inorganic, organic, and mixtures thereof can be used as the fibrous body, but inorganic fibers are advantageous from the viewpoint of cost and heat insulation performance. As an example of the inorganic fiber, a known material such as glass wool, glass fiber, alumina fiber, silica alumina fiber, silica fiber, rock wool, or the like can be used.

  Moreover, mixtures of these, powder, fiber bodies, etc. are also applicable.

  The laminate film used for the jacket material is a laminate film in which the innermost layer is a heat-welded layer, the intermediate layer has a gas barrier layer, a metal foil or a metal vapor-deposited layer, and the outermost layer is provided with a surface protective layer. Applicable. In addition, the laminate film may be applied by combining two types of laminate films, ie, a laminate film having a metal foil and a laminate film having a metal vapor deposition layer.

  In addition, as the heat welding layer, a low density polyethylene film, a chain low density polyethylene film, a high density polyethylene film, a polypropylene film, a polyacrylonitrile film, an unstretched polyethylene terephthalate film, an ethylene-vinyl alcohol copolymer film, or those A mixture or the like can be used.

  As the surface protective layer, known materials such as nylon film, polyethylene terephthalate film, and stretched polypropylene film can be used.

  Embodiments of the present invention will be described below with reference to the drawings. The present invention is not limited to the embodiments.

(Embodiment 1)
FIG. 1 is a cross-sectional view of a vacuum heat insulating material in Embodiment 1 of the present invention, and FIG. 2 is a plan view of the vacuum heat insulating material of the same embodiment.

  The vacuum heat insulating material 11 of the present embodiment is composed of nine core members 12 made of fiber bodies formed into a plate-like rectangle having a thickness of 2 to 10 mm, and an outer layer made of a gas barrier laminate film including an aluminum vapor deposited film. The nine core members 12 are covered with a substrate 13 and the inside of the jacket member 13 is decompressed and sealed, and the nine core members 12 are arranged in a lattice shape with the adjacent core member 12 in the vertical (horizontal) direction. It is arranged so as to be opposed to each other by a predetermined distance, and the outer cover material 13 is thermally welded around the core material 12 by heating and pressurizing the portion including the core material 12 between the outer cover material 13. The vacuum insulating material 11 is provided with a portion 14 and each of the nine core materials 12 is located in an independent space. ), Because the density of the core material is smaller than the central part, heating and pressurization during thermal welding Those which are chamfered more diagonally.

  The core material 12 of the present embodiment has a tapered outer peripheral portion by providing a chamfered portion 12a at a corner portion that abuts against the jacket material 13.

  The vacuum sealing process of the vacuum heat insulating material 11 of the present embodiment is the same as the vacuum sealing process of the conventional vacuum heat insulating material shown in FIG.

  The vacuum heat insulating material 11 according to the present embodiment is a vacuum heat insulating material in which nine core materials 12 are vacuum-sealed in independent spaces by heating and pressurizing a portion including the core material 12 between the jacket materials 13. In the material 11, at least the corners of the core material 12 on the side close to the adjacent core material 12 among the corners of the core material 12 in contact with the jacket material 13 are chamfered. It becomes easy to deform corresponding to the shape and arrangement, and it is possible to narrow the interval between adjacent core materials 12 and increase the thickness of the core material 12 as compared with those using a core material that is not chamfered. Thus, the heat insulating performance of the vacuum heat insulating material 11 can be enhanced.

  Moreover, since the core material 12 of this Embodiment is a rectangle, when applying as heat insulation materials, such as a floor heating system, the core material 12 can be effectively arrange | positioned in the size of a general rectangle, and a core material The effect of minimizing the area of the portion without 12 as compared with other shapes is obtained.

  In addition, although the shape of the core material 12 of the vacuum heat insulating material 11 by this Embodiment is a rectangle, the arbitrary shapes which consist of a triangle, a polygon, circular, L type, and these combination can be selected, and arrangement | positioning of the core material 12 is possible. Also, it can be arbitrarily determined such as staggered.

  In addition, the core material 12 of the vacuum heat insulating material 11 according to the present embodiment controls the density of the core material 12 to be smaller as it is closer to the outer periphery so that the angle is inclined at the time of atmospheric compression, and is chamfered by atmospheric compression, Like the chamfered portion 15a of the core member 15 shown in FIG. 3, the density may be controlled so that the corners are rounded and the corners are stepped.

  Further, the core material 12 of the vacuum heat insulating material 11 according to the present embodiment is chamfered so that the angle is oblique so that the outer peripheral end face remains (so that the longitudinal section is octagonal). As in the chamfered portion 16a of the core member 16 shown in FIG. 6, the density may be reduced to the outer periphery so that the outer peripheral end face does not remain (the longitudinal section becomes a hexagonal shape), and chamfering may be performed.

(Embodiment 2)
Hereinafter, the vacuum heat insulating material in Embodiment 2 of this invention is demonstrated. FIG. 5 is a cross-sectional view of the vacuum heat insulating material in Embodiment 2 of the present invention.

  The vacuum heat insulating material 21 of the present embodiment is composed of nine core members 22 made of fiber bodies formed into a plate-like rectangle having a thickness of 2 to 10 mm, and an outer layer made of a gas barrier laminate film including an aluminum vapor deposited film. Covered with the covering materials 23a and 23b, the inside of the covering materials 23a and 23b is sealed under reduced pressure, and the nine core materials 22 are arranged in a lattice shape in a horizontal (vertical) direction with the core material 22 adjacent in the vertical (horizontal) direction. ) Are separated from each other by a predetermined distance so as to face each other, and by heating and pressurizing the portion including the core material 22 between the jacket materials 23a and 23b, the outer periphery of the core material 22 is provided. The heat insulation part 24 of the to-be-processed materials 23a and 23b is provided, and each of the nine core materials 22 is the vacuum heat insulating material 21 located in the independent space, Comprising: The core material 22 is located in the center part. A second core member 22B is provided on the outer periphery of the first core member 22A, and the outer cover In 23a abutting corner, by the density of the second core member 22B is smaller than the first core member 21A, those which are bevelled by heating and pressing at the time of thermal welding.

  The core material 22 of the present embodiment has a tapered outer peripheral portion by providing a chamfered portion 22a at a corner portion that comes into contact with the jacket material 23a.

  The core material 22 of the present embodiment includes a second core material 22B so as to surround the outer periphery of the first core material 22A in two plate-shaped core material pieces 22A and 22B having different densities. It is.

  In the vacuum heat insulating material 21 of the present embodiment, the longitudinal cross-sectional shape of the core material 22 is not symmetric in the thickness direction of the core material 22, and the outer cover material 23 a side of one surface of the core material 22 is tapered. Since the area of the surface of the core member 22 facing the outer cover material 23a is smaller than the area of the surface of the other surface facing the outer cover material 23b, it is shown in FIG. Even when the vacuum sealing process is performed in the same manner as the vacuum sealing process of the conventional vacuum heat insulating material, the outer cover material 23a on one surface is not opposed to the portion facing the core material 22 more than the outer cover material 23b on the other surface. However, if the heat plate on the outer cover material 23a side is more elastically deformed than the heat plate on the outer cover material 23b side in the vacuum sealing process of the conventional vacuum heat insulating material shown in FIG. Regardless of the longitudinal cross-sectional shape of the core material 22, the core in the outer cover material 23a on one surface The irregularities can be between 22 and facing portion not facing portion can be larger than the irregularities that can be in the other side outer not opposed to a portion facing the core member 22 in the covering material 23b portion.

  The vacuum heat insulating material 21 according to the present embodiment heats and pressurizes the nine core materials 22 in an independent space by heating and pressurizing the portions including the core material 22 between the covering materials 23a and 23b. In the vacuum heat insulating material 21 in which the outer cover material 23a on one surface has a large unevenness formed by a portion facing the core material 22 and a portion not facing the cover material 23b on the other surface, Since at least the corners of the core material 22 on the side close to the adjacent core material 22 are chamfered among the corners of the core material 22 in contact with the outer jacket material 23a, the outer cover material 23a has the shape and arrangement of the nine core materials 22 Compared to the case using a core material that is not chamfered, it becomes possible to reduce the interval between adjacent core materials 22 or increase the thickness of the core material 22, and the vacuum heat insulating material 21. Can improve the heat insulation performance.

  Moreover, since the core material 22 of this Embodiment is a rectangle, when applying as heat insulation materials, such as a floor heating system, the core material 22 can be effectively arrange | positioned in the size of a general rectangle, and a core material The effect of minimizing the area of the portion without 22 as compared with other shapes is obtained.

  In addition, although the shape of the core material 22 of the vacuum heat insulating material 21 by this Embodiment is a rectangle, the arbitrary shapes which consist of a triangle, a polygon, circle, L type, and these combination can be selected, and arrangement | positioning of the core material 22 is possible. Also, it can be arbitrarily determined such as staggered.

  In addition, although the core material 22 of the vacuum heat insulating material 21 by this Embodiment controls the density of the 2nd core material 22B small so that an angle may become diagonal at the time of atmospheric compression, it is chamfered by atmospheric compression, The density may be controlled so that the corners are rounded and the corners are stepped.

  Further, the core material 22 of the present embodiment includes a second core material 22B so that two plate-shaped core material pieces 22A and 22B having different densities surround the outer periphery of the first core material 22A. Yes, it is possible not only to easily obtain core materials having various shapes and thicknesses by combining with core material pieces 22A and 22B having different densities, but also to use end materials for the second core material 22B. The yield of the core material can be suppressed.

(Embodiment 3)
Hereinafter, the vacuum heat insulating material in Embodiment 3 of this invention is demonstrated. FIG. 6 is a cross-sectional view of the vacuum heat insulating material in Embodiment 3 of the present invention, and FIG. 7 is a plan view of the vacuum heat insulating material in the same embodiment.

  The vacuum heat insulating material 31 of the present embodiment is composed of nine core members 32 made of fibrous bodies formed into a plate-like rectangle having a thickness of 2 to 10 mm, and an outer layer made of a gas barrier laminate film including an aluminum vapor deposited film. Covered with the covering materials 33a and 33b, the inside of the covering materials 33a and 33b is sealed under reduced pressure, and the nine core materials 32 are arranged in a lattice shape in a horizontal (vertical) direction with the core material 32 adjacent in the vertical (horizontal) direction. ) Are separated from each other by a predetermined distance so as to face each other, and by heating and pressurizing the portion including the core material 32 between the jacket materials 33a and 33b, the outer periphery of the core material 32 is provided. The heat insulation part 34 of the materials 33a and 33b is provided, and each of the nine core materials 32 is a vacuum heat insulating material 31 positioned in an independent space, and the outer material 33a on one surface is a core Concavities and convexities are formed between the part facing the material 32 and the part not facing it. However, the outer cover material 33b on the other surface has no unevenness between the portion facing the core material 32 and the portion not facing the surface, and the surface is smooth. The core material 32 contacts the outer cover material 33a on one surface. Of the contacted corners, only the corners close to the adjacent core member 32 are chamfered in a staircase shape.

  Further, the core member 32 of the present embodiment surrounds the outer periphery of the first core member 32A having a relatively large thickness located in the center portion between the two plate-like core member pieces 32A and 32B having different thicknesses. The second core member 32B having a relatively small thickness is provided, and the first core member piece 32A is smaller in thickness than the second core member piece 32B. A stepped chamfered portion 32a is formed at a corner portion that contacts the material 33a.

  Further, of the nine core members 32 of the present embodiment, the eight core members 32 positioned on the outer peripheral portion have corners on the side far from the adjacent core member 32 (on the side corresponding to the outer periphery of the vacuum heat insulating material 31). At the corner, the end faces corresponding to the outer peripheral surfaces of the vacuum heat insulating material 31 in the first core piece 32A and the second core piece 32B are aligned and overlapped so that the chamfering of the staircase shape cannot be performed.

  The vacuum sealing process of the vacuum heat insulating material 31 according to the present embodiment is the same as the vacuum vacuum sealing process of the conventional vacuum heat insulating material shown in FIG. And can be sealed under reduced pressure.

  The vacuum heat insulating material 31 according to the present embodiment heats and pressurizes the nine core materials 32 in an independent space by heating and pressurizing the portions including the core material 32 between the jacket materials 33a and 33b. The outer cover material 33a on one surface is uneven with a portion facing the core material 32 and a portion not facing, but the outer cover material 33b on the other surface faces the portion facing the core material 32. In the vacuum heat insulating material 31 that is not uneven with the portion that is not formed and has a smooth surface, the core material 32 on the side close to the adjacent core material 32 among the corners of the core material 32 that abuts the outer cover material 33a on one surface. The chamfered corners make it easier for the jacket material 33a to correspond to the shape and arrangement of the nine core materials 32, and the spacing between adjacent core materials 32 compared to those using non-chamfered core materials. Can be narrowed, or the thickness of the core 32 can be increased. It is possible to increase the insulation performance of the timber 31.

  By the way, in many cases, there is no problem even if the width of the fin on the outer peripheral portion of the vacuum heat insulating material 31 is wider than the width of the heat welding portion 34 between the adjacent core materials 32. Since the outer peripheral portion is less likely to cause poor thermal welding than between the adjacent core members 32, the core member 32 located at the outer peripheral portion of the plurality of core members 32 is far from the adjacent core member 32. By not chamfering the corner (the corner corresponding to the outer periphery of the vacuum heat insulating material 31), the average thickness of the core material 32 can be suppressed, and the heat insulating performance of the vacuum heat insulating material 31, particularly the outer peripheral portion, can be enhanced. .

  Moreover, since the core material 32 of this Embodiment is a rectangle, when applying as heat insulation materials, such as a floor heating system, the core material 32 can be effectively arrange | positioned in the size of a general rectangle, and a core material The effect of minimizing the area of the portion without 32 as compared with other shapes is obtained.

  In addition, although the shape of the core material 32 of the vacuum heat insulating material 31 by this Embodiment is a rectangle, the arbitrary shapes which consist of a triangle, a polygon, circle, L type, and these combination can be selected, and arrangement | positioning of the core material 32 is possible. Also, it can be arbitrarily determined such as staggered.

  In addition, the core material 32 of the present embodiment is relatively thick on the outer periphery of the relatively thick first core material 32A located at the center in two plate-like core material pieces 32A and 32B having different thicknesses. The second core material 32B is small, and a stepped chamfered portion 32a can be easily formed by combining a plurality of core material pieces 32A and 32B, and has various shapes and thicknesses. Not only can the core material be easily obtained, but also the chamfering processing and density control of the core material are unnecessary, and the productivity is improved.

  As described above, the vacuum heat insulating material according to the present invention is a vacuum heat insulating material in which a plurality of core materials are vacuum-sealed in independent spaces by heating and pressurizing including a portion where the core material is located between the jacket materials. In this case, it is possible to reduce the interval between adjacent core materials and increase the thickness of the core material, and to improve the heat insulation performance of the vacuum heat insulating material. In addition, the present invention can be applied to applications such as heat insulation for heat damage countermeasures for equipment that requires space saving, such as information equipment and electronic equipment.

  In addition, by appropriately selecting the size of multiple core materials and ensuring flexibility, it can be used as a vacuum insulator with more versatility, in addition to jackets as cold protection, trousers, hats, gloves, It can also be applied to bedding for futons and cushions.

Sectional drawing of the vacuum heat insulating material in Embodiment 1 of this invention Plan view of the vacuum heat insulating material of the same embodiment Sectional drawing which shows the modification of the core material of the vacuum heat insulating material of the embodiment Sectional drawing which shows another modification of the core material of the vacuum heat insulating material of the embodiment Sectional drawing of the vacuum heat insulating material in Embodiment 2 of this invention Sectional drawing of the vacuum heat insulating material in Embodiment 3 of this invention Plan view of the vacuum heat insulating material of the same embodiment Cross section of conventional vacuum insulation Plan view of conventional vacuum insulation Conceptual diagram showing the vacuum sealing process for conventional vacuum insulation materials

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 Vacuum heat insulating material 12 Core material 12a Chamfering part 13 Outer coating material 14 Thermal welding part 15 Core material 15a Chamfering part 16 Core material 16a Chamfering part 21 Vacuum heat insulating material 22 Core material 22A 1st core material piece 22B 2nd core material Piece 22a Chamfered portion 23a, 23b Cover material 24 Heat welded portion 31 Vacuum heat insulating material 32 Core material 32A First core material piece 32B Second core material piece 32a Chamfered portion 33a, 33b Cover material 34 Heat welded portion

Claims (3)

  A plurality of plate-like core members are covered with a gas barrier outer covering material, and the inside of the outer covering material is sealed under reduced pressure, and the plurality of core members are arranged separated from each other by a predetermined distance. By heating and pressing including a portion where the core material is between, a heat-welded portion of the jacket material is provided around the core material, and each of the plurality of core materials is located in an independent space. A vacuum heat insulating material, wherein the core material is chamfered by making the density at the outer peripheral portion of each core material lower than the center portion.   A plurality of plate-like core members are covered with a gas barrier outer covering material, and the inside of the outer covering material is sealed under reduced pressure, and the plurality of core members are arranged separated from each other by a predetermined distance. By heating and pressing including a portion where the core material is between, a heat-welded portion of the jacket material is provided around the core material, and each of the plurality of core materials is located in an independent space. A vacuum insulation material, wherein each of the core materials is disposed on the outer periphery of the first core material at a lower density than the first core material located in a central portion. The vacuum heat insulating material by which the said core material is chamfered by comprising with a 2 core material.   A plurality of plate-like core members are covered with a gas barrier outer covering material, and the inside of the outer covering material is sealed under reduced pressure, and the plurality of core members are arranged separated from each other by a predetermined distance. By heating and pressurizing including a portion where the core material is between, a heat-welded portion of the jacket material is provided around the core material, and each of the plurality of core materials is located in an independent space. A vacuum insulation material, wherein each of the core materials is disposed on the outer periphery of the first core material having a thickness smaller than that of the first core material located in a central portion. The vacuum heat insulating material by which the said core material is chamfered by comprising with a 2 core material.

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