JP2013194761A - Vacuum insulating material and heat insulation box body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide excellent heat insulation performance over a long period of time by controlling gas invasion to the inside of a vacuum insulating material or a heat insulation box body.SOLUTION: A heat welding layer 7 of a sealing part 8 in a vacuum insulating material 1 has a boundary surface with a gas barrier layer 6 on both sides thereof. Because the wave height of swells of a boundary surface of a surface which has a metallic foil layer of a concave part exceeds the weight height of swells of a boundary surface of a surface which has a vapor deposition film layer of the concave part and a deepest part of a part which is concave to a heat welding layer 7 side of one boundary surface of the concave part does not face a deepest part of a part which is concave to a heat welding layer 7 side of the other boundary surface of the concave part, heat insulation performance excellent in controlling gas invasion to the inside can be achieved over a long period of time.

Description

  The present invention relates to a vacuum heat insulating material and a heat insulating box that are formed by sealing a core material between two outer cover materials under reduced pressure and maintaining excellent sealing performance over a long period of time.

  In recent years, as a measure against global warming, which is a serious global environmental problem, there has been an active movement to promote energy conservation in home appliances, equipment, and buildings such as houses, and a vacuum that has an excellent thermal insulation effect over the long term. Insulation is more demanded than ever.

  The vacuum heat insulating material is a material in which a core material having fine voids such as glass wool or silica powder is covered with a jacket material having gas barrier properties, and the inside of the jacket material is sealed under reduced pressure. A vacuum heat insulating material enables expression of a high heat insulating effect by keeping the inner space in a high vacuum and reducing the amount of heat transmitted through the gas phase as much as possible. Therefore, a technique for maintaining a high degree of vacuum inside the vacuum heat insulating material is extremely important in order to exhibit the excellent heat insulating effect over a long period of time.

  As a method for maintaining the degree of vacuum inside the vacuum heat insulating material, a method in which a gas adsorbent or a moisture adsorbent is sealed under reduced pressure inside the vacuum heat insulating material together with the core material is generally used. As a result, residual moisture released into the vacuum heat insulating material from the minute gaps in the core material after vacuum packaging, or atmospheric gases such as water vapor and oxygen that permeate through the jacket material from the outside air and permeate into the vacuum heat insulating material over time. Can be removed.

  As another method, there is means for suppressing the amount of atmospheric gas permeating into the vacuum heat insulating material itself. Here, a gas path entering from the outside air into the vacuum heat insulating material will be described.

  The vacuum heat insulating material is usually a three-way sealing bag that is formed by superposing two rectangular outer covering materials and heat-sealing the outer peripheral portions in the vicinity of the three sides of the outer covering material. It is manufactured by inserting the core material from the opening and thermally welding the opening of the three-side seal bag while evacuating the inside of the bag of the jacket material using a vacuum packaging machine.

  The outer cover material is usually a heat-welded layer made of a thermoplastic resin such as low density polyethylene in the innermost layer, a gas barrier layer made of a material having a barrier property such as an aluminum foil or an aluminum vapor deposited film in the intermediate layer, and an outermost layer in the outer layer. Uses a laminated film obtained by laminating a surface protective layer such as a nylon film or a polyethylene terephthalate film through an adhesive.

  In this case, the atmospheric gas that permeates from the outside air into the vacuum heat insulating material passes through the sealing portion from the portion where the component that permeates from the surface of the jacket material and the heat-welded layer on the edge surface of the jacket material are exposed. And the components that permeate inside.

  Of these, the thermoplastic resin constituting the heat-welded layer has extremely high gas permeability and moisture permeability compared to the gas barrier layer. Most of the material is transmitted through the sealing portion to the inside from the exposed portion of the heat-welded layer on the end surface of the peripheral edge of the workpiece.

  Therefore, in order to provide a vacuum insulation material that maintains excellent heat insulation performance over a long period of time, it is indispensable to suppress the amount of atmospheric gas permeation from the exposed part of the edge of the outer periphery of the outer jacket material. Techniques have been a challenge.

  In response to this problem, there has been reported a vacuum heat insulating material provided with a thin portion in which a part of the heat-welded layer in the sealing portion is thin (see, for example, Patent Document 1).

  FIG. 9 is a cross-sectional view of a conventional vacuum heat insulating material described in Patent Document 1.

  As shown in FIG. 9, in the vacuum heat insulating material 101, a part of the heat welding layer 103 in the sealing portion of the outer covering material 104 having the gas barrier layer 102 and the heat welding layer 103 is thin. The thin-walled portion 105 is formed by using a sealing jig 106 as shown in FIG. 10 to apply a particularly strong pressure to a portion of the jacket material 104 at the sealed portion. It is formed so as to surround the circumference.

  In the conventional configuration, the permeation resistance of the gas entering from the end face of the outer periphery of the jacket material is increased by the thin wall portion 105, and it is said that excellent heat insulation performance can be exhibited for a long time by suppressing the gas intrusion into the inside. Yes.

Japanese Utility Model Publication No. 62-141190

  In order to provide a vacuum heat insulating material that maintains excellent heat insulation performance for a longer period of time, the sealing portion is formed from the component that is permeated from the surface of the outer cover material and the portion where the heat-welded layer on the edge surface of the outer cover material is exposed. The amount of permeation of both atmospheric gases through the components that pass through the interior must be suppressed.

  However, when the thin portion 105 has the configuration of the above-mentioned Patent Document 1 and has corner portions 107 on both sides as shown in FIG. 10, cracks are generated in the corner portions 107 during the manufacture and handling of the vacuum heat insulating material. Occur. From this crack, there was a problem that the penetration of atmospheric gas components into the vacuum heat insulating material was promoted over time.

  Here, the corner portion 107 refers to the thermal weld layer 103 generated at and near the boundary of the thin portion 105 when the cross section when the sealing portion is cut by a plane perpendicular to the periphery of the outer covering material 104 is seen. This refers to a square-shaped part (a part having a large curvature) formed with a change in thickness.

  The present invention solves the above-described conventional problems, and the gas barrier layer is hardly cracked or broken at the thin portion of the heat-welded layer provided in the sealing portion and in the vicinity thereof. An object of the present invention is to provide a vacuum heat insulating material that maintains excellent heat insulating performance.

  In order to achieve the above object, the vacuum heat insulating material of the present invention is a vacuum heat insulating material in which outer peripheral portions in the vicinity of the peripheral edges of two outer cover materials to be inserted and sealed are thermally welded. When the material is composed of a protective layer, metal foil and vapor deposition, and a heat-welded layer, and at least a part of the sealing portion where the outer peripheral portions of the jacket material are heat-welded to each other is cut along a plane perpendicular to the peripheral edge When the cross section is viewed, the thermal welding layer located in the sealing portion has at least one concave portion on the surface having the metal foil layer, and the thickness of the thermal welding layer is the deepest portion of the concave portion. A thin part thinner than the peripheral part of the deepest part is formed.

In the above configuration, first, when looking at a cross section when cutting at least a part of the sealing portion in which the peripheral portions of the jacket material are heat-welded with each other in a plane perpendicular to the peripheral portion, the heat-welding layer of the sealing portion By providing a thin portion with a locally thin thickness, the permeation area of gas and moisture entering from the end surface of the outer periphery of the outer cover material is reduced in the thin portion of the heat-welded layer, and the permeation resistance of gas and moisture is increased. In addition, since the permeation rate of gas and moisture is reduced, the amount of gas and moisture that permeate over time is suppressed, and excellent sealing performance can be exhibited over a long period of time.

  In addition, when viewing a cross-section when cutting at least a part of the sealing portion in which the peripheral portions of the jacket material are heat-welded with each other in a plane perpendicular to the peripheral edge, the metal foil laminated on the outer layer side from the heat-welded layer The thermal weld layer bends along the shape of at least one recess in the thin part of the sealing part and in the vicinity thereof, but when receiving external force during the formation of the recess, the stress is gradually reduced as it becomes the inner layer. It is difficult for stress to be locally concentrated, and the occurrence of cracks in the metal foil laminated on the outer layer side from the heat-welded layer is extremely difficult to occur.

  Furthermore, in the thin part of the heat-welded layer, the thickness of the heat-welded layer is thinner than the peripheral part, and the strength is reduced by the thickness reduction, but the thickness of the heat-welded layer is gradually smoothed along the corners. Along with the increase / decrease, the strength of the sealing part also increases / decreases smoothly continuously, so that stress is unlikely to concentrate locally in the thin part of the heat weld layer, and the thin part of the heat weld layer and its vicinity. Cracks in the outer cover material and breakage of the sealing portion are extremely difficult to occur.

  The vacuum heat insulating material is obtained by evacuation by using the filler as a core material and inserting the core material into the bag body.

  As described above, the vacuum heat insulating material that maintains the excellent heat insulating performance for a long period of time, in which the occurrence of cracking of the metal foil and the fracture of the sealing portion hardly occur in the thin portion of the heat welding layer provided in the sealing portion and the vicinity thereof. Can be provided.

  According to the present invention, by providing the thin portion where the thickness of the heat-welding layer of the sealing portion is locally thin, the gas and moisture amount entering from the end face of the outer periphery of the outer jacket material are suppressed, and the thermal insulation layer is excellent over a long period of time. Sealing performance can be demonstrated. In addition, when an external force is applied during the formation of the recess, the occurrence of cracks in the metal foil laminated on the outer layer side from the heat-welded layer is extremely difficult to occur. Furthermore, it is difficult for stress to be locally concentrated in the thin portion of the heat-welded layer, and cracks and breakage of the sealing portion in the thin-wall portion of the heat-welded layer and the jacket material in the vicinity thereof are extremely unlikely to occur.

  As described above, it is possible to provide a vacuum heat insulating material that maintains the excellent heat insulating performance for a long period of time, in which the generation of cracks and the breakage of the sealing portion are extremely unlikely to occur in the thin portion of the heat welding layer provided in the sealing portion and in the vicinity thereof.

Sectional drawing of the vacuum heat insulating material in Embodiment 1 of this invention Plan view of the vacuum heat insulating material in the first embodiment Sectional drawing which shows an example of the sealing part containing the thin part in the vacuum heat insulating material in Embodiment 1 Sectional drawing which shows the heating compression jig | tool of the vacuum heat insulating material in the same Embodiment 1. Sectional drawing which shows the modification of the sealing part containing the thin part of the bag body in Embodiment 1 of this invention The perspective view of the heat insulation box in Embodiment 2 of this invention Front sectional view of the heat insulation box in the second embodiment The longitudinal cross-sectional view of the heat insulation box in Embodiment 2 Cross section of conventional vacuum insulation Sectional drawing which shows the state which forms the thin part with the heating compression jig of the conventional vacuum heat insulating material

  According to a first aspect of the present invention, there is provided two jackets that cover the core member by sealing the core member under reduced pressure between the outer cover member having a metal foil layer facing the heat-welded layers and the outer cover member having a vapor deposition film layer. In the vacuum heat insulating material in which the outer peripheral portions in the vicinity of the periphery of the material are heat-welded, at least a part of the sealing portion in which the outer peripheral portions of the jacket material are heat-welded is cut by a plane perpendicular to the peripheral edge. When the cross section is viewed, the heat-welded layer located in the sealing portion has a recess, and the thin-walled portion where the thickness of the heat-welded layer is thinner than the peripheral portion of the deepest portion is in the deepest portion of the recess. Is formed.

  Furthermore, the thermal welding layer of the sealing portion has a boundary surface with other layers on both surfaces, and the wave height of the undulation of the boundary surface of the surface having the metal foil layer of the concave portion is a vapor deposition film layer of the concave portion. The deepest part of the part of the concave part that is concave on the thermal welding layer side of one of the boundary surfaces, and the other boundary surface of the concave part. It has a feature that the deepest portion of the concave portion on the heat welding layer side does not face.

  In the above configuration, first, when looking at a cross section when cutting at least a part of the sealing portion in which the peripheral portions of the jacket material are heat-welded with each other in a plane perpendicular to the peripheral portion, the heat-welding layer of the sealing portion By providing a thin portion with a locally thin thickness, the permeation area of gas and moisture entering from the end surface of the outer periphery of the outer cover material is reduced in the thin portion of the heat-welded layer, and the permeation resistance of gas and moisture is increased. In addition, since the permeation rate of gas and moisture is reduced, the amount of gas and moisture that permeate over time is suppressed, and excellent heat insulation performance can be exhibited over a long period of time.

  Further, in the thin wall portion and the vicinity thereof, the outer cover material on the outer layer side from the heat welding layer receives stress due to distortion along the shape of the heat welding layer, and the strength is reduced, but one boundary of the concave portion By making the wave height of the waviness of the surface larger than the wave height of the waviness of the other boundary surface of the recess, the strength reduction of the outer shell material on the boundary surface side having a relatively small wave height is reduced relative to the other. In comparison with the outer shell material on the boundary surface side having a large wave height, the outer shell material having a small strength decrease supports the other outer shell material at the sealing portion of the outer shell material. Thus, cracks and breakage of the sealing portion are hardly caused when an external force is applied.

  In addition, if there is a thin portion, not only the thickness of the heat-welded layer is thin and the strength is lowered, but also the strength of the outer jacket material is reduced due to distortion because the deepest portion of the concave portion is located. The deepest part of the part that is concave on the side of the thermal welding layer of the boundary surface and the deepest part of the part that is concave on the side of the thermal welding layer of the other boundary surface of the recess are not facing each other, A decrease in strength of the sealing portion where the deepest portion of the concave portion is located is suppressed, and damage or breakage when the sealing portion receives an external force is extremely difficult to occur. At the same time, the effect of suppressing the occurrence of cracks in the gas barrier layer in the recesses is further enhanced.

  In addition, a recessed part is a sealing part when seeing the cross section at the time of cut | disconnecting at least one part of the sealing part by which the outer peripheral parts of the jacket material were heat-welded by a plane perpendicular | vertical to the periphery of a jacket material. This is a portion where the heat-welded layer is recessed, and indicates a curved portion where a boundary line (boundary surface) between the heat-welded layer and another layer adjacent to the outside of the heat-welded layer is convex toward the heat-welded layer.

  In addition, the deepest part of a recessed part refers to the point part located in the location where the thickness of the heat welding layer located between the points on the opposing boundary surface is the thinnest among the point groups which form the recessed part. .

  Note that the boundary surface refers to a boundary surface between the heat-welded layer and another layer included in the jacket material adjacent to the heat-welded layer in the sealing portion.

The wave height refers to the distance between the boundary surface located in the peripheral portion of the recess and a plane parallel to the boundary surface including the deepest portion of the recess.

  As described above, it is possible to provide a vacuum heat insulating material that maintains the excellent heat insulating performance for a long period of time, in which the generation of cracks and the breakage of the sealing portion are extremely unlikely to occur in the thin portion of the heat welding layer provided in the sealing portion and in the vicinity thereof.

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

  The heat welding layer constituting the jacket material is not particularly specified, but a low density polyethylene film, a linear low density polyethylene film, a high density polyethylene film, a medium density polyethylene film, a polypropylene film, a polyacrylonitrile film, etc. These thermoplastic resins or mixed films thereof can be used.

  The laminate adhesive used for the jacket material is not particularly specified, and conventionally known laminate adhesives such as two-component curable urethane adhesives or epoxy resin adhesives can be used.

  The core material is not particularly specified for its type, but is a porous body having a gas layer ratio of about 90%, and is open-celled such as urethane foam, styrene foam, phenol foam, glass wool, rock wool, alumina fiber, Conventionally known core materials such as fiber bodies such as silica-alumina fibers, powders such as pearlite, wet silica, and dry silica can be used.

  The adsorbent is not particularly specified for its type, but it adsorbs residual gas components in the core material and jacket material, and moisture and gas entering the jacket material, such as calcium oxide, zeolite, silica gel, etc. A getter material such as a gas adsorbent or a moisture adsorbent can be used as long as it has an action of lowering or maintaining the vacuum degree of the outer cover material.

  The second invention is characterized in that a gas adsorbent is provided inside the vacuum heat insulating material.

  Thereby, since the vacuum heat insulating material using the gas adsorbent has the gas adsorbent in the jacket material, the pressure inside the jacket material is kept low, and the heat of the vacuum heat insulating material using the core material is maintained. Since the conductivity is kept low, it is possible to provide a vacuum heat insulating material that maintains excellent heat insulating performance over a long period of time.

  3rd invention fixes one said heat-transfer surface of the vacuum heat insulating material which has two heat-transfer surfaces which oppose each other to the surface facing the outer box in an inner box, and the said outer box and the said inner box It is the heat insulation box which filled the remaining space except the said vacuum heat insulating material part in between with the foam heat insulating material.

  As described above, it is possible to provide a heat insulating box that maintains excellent vacuum performance over a long period of time.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings, taking a vacuum heat insulating material and a heat insulating box as examples. Note that the same reference numerals are given to the same components as those of the above-described embodiment, and the detailed description thereof will be omitted. Further, the present invention is not limited to the embodiments.

(Embodiment 1)
1 is a cross-sectional view of a vacuum heat insulating material according to Embodiment 1 of the present invention, FIG. 2 is a plan view of the vacuum heat insulating material of the same embodiment, and FIG. 3 is a thin-walled portion of the vacuum heat insulating material of the same embodiment. Sectional drawing which shows an example of the sealing part containing is shown.

  In FIG. 1, a vacuum heat insulating material 1 includes a core material 2, an adsorbent 3 disposed in the core material 2, and two rectangular envelope materials 4 cut to the same dimensions. The core material 2 and the adsorbent 3 are sealed under reduced pressure between the materials 4, and the outer peripheral portions in the vicinity of the peripheral edges of the two jacket materials 4 covering the core material 2 are heat-welded.

  The two jacket materials 4 are formed by laminating a surface protective layer 5, a gas barrier layer 6, and a heat welding layer 7 from the outer layer side. One gas barrier layer 6 is a metal foil layer, and the other gas barrier layer 6 is a vapor deposition film layer. In addition, on the peripheral side (outer peripheral portion) of the jacket material 4, there is a sealing portion 8 in which the heat-welding layers of the jacket material are melted and bonded together, and three of the four sides of the sealing portion 8. Has a thin portion 9.

  Here, the shape of the sealing part 8 around the thin part 9 will be described.

  In FIG. 3, there is a difference in the wave height of the arc-shaped concave portion provided on the boundary surface between the heat welding layer 7 and the gas barrier layer 6, and the concave portion provided on the boundary surface having the concave portion having a large wave height. Only the deepest part is located in the thin part 9.

  Next, in the present embodiment, an example of a method for manufacturing the vacuum heat insulating material 1 of the present embodiment shown in FIGS.

  First, it arrange | positions so that the heat-welding layers 7 of the two jacket | cover materials 4 may oppose, and the three sides of the circumference | surroundings of the jacket | cover_material 4 are heat-welded and it is set as a bag shape. At the time of this thermal welding, the outer cover material having a metal foil layer is directed to the heat compression jig 10 with a metal heat compression jig 10 (see FIG. 4) and a silicon rubber heater, and the outer cover material having a vapor deposition film layer is changed to silicon rubber. In a shape facing the heater, heat compression is performed so as to sandwich the two outer covering materials 4 to form the sealing portion 8 having the shape shown in FIG. Thereafter, the core material 2 and the adsorbent 3 are inserted into the bag, and the vacuum heat insulating material 1 is obtained by thermally welding and sealing the opening of the bag of the jacket material 4 while reducing the pressure inside the bag.

  The reason why the outer cover material having the metal foil layer is directed to the heat compression jig 10 and the outer cover material having the vapor deposition film layer is directed to the silicon rubber heater is heated and compressed so as to sandwich the two outer cover materials 4. This is because when the outer cover material having the vapor deposition film layer is directed to the heating and compression jig 10, the edge of the sealing portion 8 is cut off.

  Here, the two outer jacket materials 4 that are not thermally welded by the heat compression jig 10 are heated and compressed to simultaneously form the sealing portion 8 including the thin wall portion 9. After forming the sealing portion 8 made of a heat-welded layer having a substantially uniform thickness without having a thin portion using a normal flat plate jig, the thin portion is heated and compressed on the sealing portion 8 with the heating compression jig 10. 9 may be formed.

  Moreover, when sealing the bag opening part of the 4th side, in order to seal, reducing the inside of a bag, it is necessary to seal using a vacuum packaging machine.

  Since a normal vacuum packaging machine is equipped with a flat plate heat seal jig, only the bag opening is formed using the vacuum packaging machine after forming the sealing portion 8 made of a heat welding layer having a substantially uniform thickness. You may form the thin part 9 using the heating compression jig 10. FIG.

The vacuum heat insulating material 1 according to the present embodiment includes two sheets of the core material 2 and the adsorbent 3 that are sealed under reduced pressure between the two rectangular outer cover materials 4 facing each other with the heat-welded layers 7 facing each other. 3 is a vacuum heat insulating material 1 in which the outer peripheral portions of the three sides in the vicinity of the periphery of the jacket material 4 are heat-welded, and the sealing is performed on three sides of the sealing portion 8 in which the outer peripheral portions of the jacket material 4 are heat-welded. When the cross section when the part 8 is cut by a plane perpendicular to the periphery is viewed, the sealing part 8
The heat-welded layer 7 located at the center has a substantially arc-shaped recess, and a thin-walled portion 9 is formed at the deepest portion of the recess, where the thickness of the heat-welded layer 7 is thinner than the peripheral portion of the deepest portion.

  Moreover, the heat welding layer 7 of the sealing part 8 has a boundary surface with another layer (gas barrier layer 6) on both surfaces, and the wave height of the undulation of the boundary surface having the metal foil layer of the concave portion is the deposition of the concave portion. It is larger than the wave height of the undulation of the boundary surface of the surface having the film layer.

  In addition, the deepest portion of the concave portion on the side of the thermal welding layer on one boundary surface of the concave portion and the deepest portion of the concave portion on the side of the thermal bonding layer on the other boundary surface of the concave portion face each other. Not.

  In the example shown in FIG. 3, the sealing portion 8 has at least two thin portions 9 (four).

  About the vacuum heat insulating material 1 comprised as mentioned above, the operation | movement and an effect | action are demonstrated below.

  First, the core material 2 plays a role of forming a fine space as an aggregate of the vacuum heat insulating material 1, forms a heat insulating portion of the vacuum heat insulating material 1 after evacuation, and is made of glass fiber.

  The adsorbent 3 serves to adsorb and remove residual gas components released into the vacuum heat insulating material 1 from the fine gaps of the core material 2 after vacuum packaging, and moisture and gas that enter the vacuum heat insulating material 1. .

  The gas adsorbent is composed of an adsorbing material and a container capable of adsorbing a non-condensable gas contained in the gas.

  As main adsorbing materials, alloys consisting of zirconium, vanadium and tungsten, alloys containing one element of rare earth elements such as iron, manganese, yttrium, lanthanum, Ba-Li alloys, and metal ion exchanged zeolites, etc. There is. Accordingly, since nitrogen having approximately 75% in the air can be adsorbed at room temperature, a high degree of vacuum can be obtained.

  As main containers, there are metal materials such as aluminum, iron, trunk, and stainless steel, and aluminum is preferable in consideration of cost and handling.

  The jacket material 4 is obtained by laminating a thermoplastic resin, a metal foil having a gas barrier property, a resin film, or the like, and plays a role of suppressing atmospheric gas intrusion into the vacuum heat insulating material 1 from the outside.

  The surface protective layer 5 serves to prevent the outer cover material 4, particularly the gas barrier layer 6 from being damaged or torn from an external force, located on the outer layer side of the gas barrier layer 6 among the layers of the outer cover material.

  As the surface protective layer 5, a conventionally known material such as a nylon film, a polyethylene terephthalate film, or a polypropylene film can be used, and one type or two or more types may be used.

  The gas barrier layer 6 is a layer composed of one or more kinds of films having high barrier properties, and imparts excellent gas barrier properties to the jacket material 4.

As the gas barrier layer 6, metal foil such as aluminum foil, copper foil, stainless steel foil, polyethylene terephthalate film, ethylene-vinyl alcohol copolymer film, metal atoms such as aluminum or copper, or metal oxide such as alumina or silica are used. A vapor-deposited film, a film in which a metal atom or metal oxide is vapor-deposited, or the like can be used.

  The thermal welding layer 7 welds the jacket materials 4 to each other, and in addition to the role of maintaining the vacuum inside the vacuum heat insulating material 1, the gas barrier from the piercing from the inside of the vacuum heat insulating material 1 by the core material 2 and the adsorbent 3, etc. It serves to protect the layer 6.

  The sealing portion 8 is configured by welding the heat welding layers 7 of the jacket material 4, and plays a role of blocking the inside and the outside of the vacuum heat insulating material 1.

  The thin-walled portion 9 serves to maintain the vacuum degree of the vacuum heat insulating material 1 by suppressing the permeation rate of atmospheric gas that enters the vacuum heat insulating material 1 through the sealing portion 8 from the end surface of the outer periphery of the jacket material 4. Yes.

  As described above, in the present embodiment, the thin-walled portion 9 is provided at the deepest position of the substantially arc-shaped concave portion included in the boundary surface between the heat welding layer 7 and the gas barrier layer 6 in the sealing portion 8. Since there is a difference in the wave heights of the recesses on the boundary surface of the layers, the gas barrier layer 6 and the jacket material 4 are extremely unlikely to deteriorate and break, and the atmospheric gas intrusion into the vacuum heat insulating material 1 with time Is suppressed.

  Moreover, when the vacuum heat insulating material 1 is produced by the above-described manufacturing method, the heat-welded layer 7 is usually heated and compressed by the superheated compression jig 10 constituted by the protruding portions 11 having an arcuate curved surface as shown in FIG. 10 is applied to the direction perpendicular to the tangent line of the arc of the protrusion 11, the resin of the heat-welded layer 7 can easily flow toward both ends of the thin portion 9. Compared with the case where the flat portion such as the conventional sealing jig 106 is compressed, the temperature condition and pressure condition at the time of manufacturing when the same thin portion 9 is obtained are relaxed, and the gas barrier layer 6 and Deterioration of the jacket material 4 is suppressed.

  In other words, under the same molding conditions, the thickness of the thin portion 9 of the heat-welded layer 7 can be further reduced, and the amount of gas and moisture intrusion from the end surface of the outer periphery of the outer cover material 4 can be easily suppressed.

  The vacuum heat insulating material 1 according to the present embodiment includes two sheets of the core material 2 and the adsorbent 3 that are sealed under reduced pressure between the two rectangular outer cover materials 4 facing each other with the heat-welded layers 7 facing each other. 3 is a vacuum heat insulating material 1 in which the outer peripheral portions of the three sides in the vicinity of the periphery of the jacket material 4 are heat-welded, and the sealing is performed on three sides of the sealing portion 8 in which the outer peripheral portions of the jacket material 4 are heat-welded. When the cross section when the portion 8 is cut by a plane perpendicular to the periphery is viewed, the heat welding layer 7 located in the sealing portion 8 has a substantially arc-shaped recess, and the heat welding is performed at the deepest portion of the recess. A thin portion 9 in which the thickness of the layer 7 is thinner than the peripheral portion of the deepest portion is formed.

  In the above-described configuration, first, when a cross-section when cutting at least a part of the sealing portion 8 where the peripheral portions of the jacket material 4 are heat-welded is cut by a plane perpendicular to the peripheral portion, the heat of the sealing portion 8 is obtained. By providing the thin portion 9 where the thickness of the welding layer 7 is locally thin, the gas and moisture permeation cross-sectional area entering from the end face of the outer periphery of the outer cover material 4 is reduced in the thin portion 9 of the heat welding layer 7. Since the permeation resistance of gas and moisture is increased and the permeation rate of gas and moisture is reduced, the amount of gas and moisture that permeate with time is suppressed, and excellent heat insulation performance can be exhibited over a long period of time.

  Moreover, when the cross section at the time of cut | disconnecting at least one part of the sealing part 8 by which the peripheral parts of the jacket material 4 were heat-welded by a plane perpendicular | vertical to a peripheral part was seen, the heat welding layer located in the sealing part 8 7 has a substantially arc-shaped recess, the layer (gas barrier layer 6) laminated on the outer layer side of the heat-welded layer 7 is the thin-walled portion 9 of the sealing portion 8 and the vicinity thereof. In this way, the generation of cracks in the layer (gas barrier layer 6) laminated on the outer layer side from the heat-welded layer 7 is extremely difficult to occur without forming a corner portion by bending in a circular arc shape.

  Here, as a matter of course, it is desirable that corner portions are not formed in the entire sealing portion 8, not limited to the thin-walled portion 9 and the vicinity thereof.

  Further, in the thin-walled portion 9 of the heat-welded layer 7, the thickness of the heat-welded layer 7 is thinner than the peripheral portion, and the strength is reduced by the thickness reduction, but the concave portion of the heat-welded layer 7 has a substantially arc shape. When formed, the strength (bending strength, etc.) of the sealing portion 8 also increases and decreases smoothly and continuously as the position changes as the thickness of the heat welding layer 7 gradually increases and decreases along the arc. Therefore, it is difficult for external force to concentrate locally in the thin portion 9 of the heat-welded layer 7, and cracks in the thin-wall portion 9 of the heat-welded layer 7 and the jacket material 4 in the vicinity thereof and breakage of the sealing portion 8 are caused. Is extremely difficult to occur.

  By the above, the vacuum heat insulating material which maintains the heat insulation performance excellent in the long term in which the crack generation | occurrence | production and the fracture | rupture of the sealing part 8 do not occur easily in the thin part 9 of the heat welding layer 7 provided in the sealing part 8 and its vicinity. 1 can be provided.

  Further, in the vacuum heat insulating material 1 of the present embodiment, the heat welding layer 7 of the sealing portion 8 has a boundary surface with another layer (gas barrier layer 6) on both surfaces, and the undulation of one boundary surface of the concave portion The wave height is larger than the wave height of the undulation of the other boundary surface of the recess.

  In the thin-walled portion 9 and the vicinity thereof, the covering material 4 (each of the layers 6 and 5) on the outer layer side of the heat-welding layer 7 is distorted along the shape of the heat-welding layer 7 that is a substantially arc-shaped recess. Due to the stress caused by, the strength decreases.

  Therefore, by making the wave height of the undulation of the boundary surface on one side (upper side in FIG. 1) of the concave portion larger than that of the boundary surface on the other side (lower side in FIG. 1), the wave height is relatively small. The lowering of the strength of the outer cover material 4 on the boundary surface side having waviness (lower side in FIG. 1) In comparison with the sealing portion 8 of the outer covering material 4, the outer covering material 4 (lower in FIG. 1) supports the other outer covering material 4 (upper in FIG. 1). The rigidity is maintained in the shape, and the occurrence of cracks and breakage of the sealing portion 8 when receiving external force are extremely difficult.

  When the thin-walled portion 9 is present, not only the thickness of the heat-welded layer 7 is thin and the strength is reduced, but also the strength of the jacket material 4 is reduced due to the distortion due to the deepest portion of the recess being located.

  In the present embodiment, the deepest portion of the concave portion on the heat welding layer 7 side of one boundary surface (upper side in FIG. 1) of the concave portion and the other boundary (lower side in FIG. 1) of the concave portion Since the deepest portion of the concave portion on the surface of the surface is not opposed to the deepest portion, a decrease in strength of the sealing portion 8 where the deepest portion of the concave portion is located is suppressed, and the sealing portion 8 has an external force. Scratches and breakage are less likely to occur. At the same time, the effect of suppressing the occurrence of cracks in the gas barrier layer 6 in the recesses is further enhanced.

  Moreover, it is preferable that the sealing part 8 has at least two thin parts 9 as in the example shown in FIG.

  In the thin portion 9, the thickness of the heat-welded layer 7 is thinner than that of the other portion of the sealing portion 8, and the sealing strength is reduced. For example, glass fiber or silica powder that is the core material 2 in the manufacturing process When the outer cover material 4 is heat-welded in a state where the material is sandwiched, there is a concern that a poor heat-welding occurs in the thin portion 9.

Since there is no resin at the location where the thermal welding failure occurs, the effect of suppressing gas intrusion decreases.
As a countermeasure, by providing at least two or more thin-walled portions 9, the influence of gas and moisture intrusion promotion into the vacuum heat insulating material 1 due to poor heat welding is mitigated.

  In particular, when glass fiber is used as the core material 2, the core material 2 material sandwiched at the time of heat welding as an interstitial material is often heat-deformed and forms a through hole in the thin portion 9. The effect (of the present embodiment) of the present invention becomes more remarkable.

  Moreover, in the thin part 9, although the intensity | strength of the jacket material 4 becomes lower than a surrounding part and there is a concern about the load concentration at the time of receiving external force, the load of external force is due to the presence of a plurality of thin parts 9. Are dispersed, and the occurrence of cracks in the thin-walled portion 9 and the breakage of the sealing portion 8 are extremely difficult to occur.

  Further, when the plurality of thin portions 9 are provided, the same effect can be obtained even if the thickness of the thermal welding layer 7 in the thin portion 9 is increased as compared with the case where only one thin portion 9 is provided. 9 is reduced, and the risk of cracks in the thin-walled portion 9 and breakage of the sealing portion 8 is reduced.

  In the present embodiment, the sealing portion 8 having the thin portion 9 has three sides, but may be provided on four sides of the entire circumference of the sealing portion 8.

  In addition, the thickness of the heat welding layer 7 in each thin part 9 does not need to be the same.

  In the present embodiment, as shown in FIG. 2, the thin portions 9 are orthogonal, but the thin portions 9 do not have to intersect.

  In addition, the curvature radius of the recessed part of the interface located in each thin part 9 does not need to be the same, The metal foil and film used as the gas barrier layer 6 should just have a curvature radius of the grade which does not deteriorate. .

  In addition, the space | interval of the thin part 9 is not specified in particular, and as shown in FIG. 5, the space | interval of the recessed parts which a boundary surface does not need to be equal.

  In the present embodiment, the position of the thin-walled portion 9 is not particularly specified, but the position of the concave portion on the boundary surface exists at the boundary between the sealing portion 8 of the jacket material 4 and the portion that is not. In such a case, the resin on one side of the thin-walled portion 9 is not sufficiently heated, and the fluidity of the resin is poor.

(Embodiment 2)
FIG. 6 is a perspective view of a heat insulation box according to Embodiment 2 of the present invention. FIG. 7 is a front sectional view of a heat insulation box according to Embodiment 2 of the present invention. FIG. 8 is a longitudinal sectional view of the heat insulation box according to the first embodiment of the present invention.

  As shown in FIGS. 6 to 8, the heat insulating box body 21 includes a metal (for example, iron plate) outer box 27, a hard resin (for example, ABS) inner box 28, A heat insulating box 29 made of a foam heat insulating material 29 filled with foam between the boxes 28, a refrigerating chamber 22 provided above the main body 21, an upper freezing chamber 23 provided below the refrigerating chamber 22, and a refrigerating chamber An ice making chamber 24 provided in parallel with the upper freezing chamber 23 under the chamber 22, a vegetable chamber 26 provided in the lower part of the main body, and between the upper freezing chamber 23 and ice making chamber 24 and the vegetable chamber 26 installed in parallel. The lower freezing room 25 provided in the.

Front portions of the upper freezing chamber 23, the ice making chamber 24, the lower freezing chamber 25, and the vegetable chamber 26 are freely opened and closed by a drawer-type door (not shown), and the front side of the refrigerator compartment 22 is, for example, a double door type door (not shown). Is closed freely.

  The refrigerator compartment 22 is normally set at 1 to 5 ° C. with a temperature that does not freeze for refrigerated storage as a lower limit. The vegetable room 26 is often set to a temperature setting of 2 ° C. to 7 ° C., which is equal to or slightly higher than that of the refrigerator compartment 22. If the temperature is lowered, the freshness of leafy vegetables can be maintained for a long time. The upper freezer compartment 23 and the lower freezer compartment 25 are normally set at −22 to −18 ° C. for frozen storage, but are set at a low temperature of −30 to −25 ° C., for example, to improve the frozen storage state. Sometimes.

  The refrigerator compartment 22 and the vegetable compartment 26 are called refrigerated temperature zones because the interior is set at a plus temperature. Moreover, since the upper stage freezer room 23, the lower stage freezer room 25, and the ice making room 24 are set by the minus temperature in the store | warehouse | chamber, they are called freezing temperature zones. Moreover, the upper freezer compartment 23 may be a switching room that can be selected from a refrigeration temperature zone to a freezing temperature zone.

  The top surface portion of the heat insulation box body 21 is provided with a machine room 34 having a dent in a stepped shape toward the back surface of the heat insulation box body, and is composed of a first top surface portion 35 and a second top surface portion 36. . A compressor 37 disposed in the stepped recess, a dryer (not shown) for removing moisture, a condenser (not shown), a heat radiating pipe, a capillary tube 38, a cooler 39, The refrigerant is sealed in a refrigeration cycle in which the are sequentially connected in an annular form, and a cooling operation is performed.

  In recent years, a flammable refrigerant is often used as the refrigerant for environmental protection. In the case of a refrigeration cycle using a three-way valve or a switching valve, these functional components can be arranged in the machine room.

  Here, the vacuum heat insulating material 1 constitutes a heat insulating box body 21 together with the foam heat insulating material 29.

  Here, the vacuum heat insulating material 1 is attached to the outer box 27 in contact with the inside of the top surface, the back surface, the left side surface, and the right side surface, respectively. The vacuum heat insulating material 1 is attached in contact with the bottom surface of the inner box 28.

  Adsorbents 3 are respectively mounted inside the vacuum heat insulating material 1, and the gas adsorbent of the vacuum heat insulating material 1 is disposed on the outer side (outer box side) than the center.

  The refrigerator compartment 22, the ice making compartment 24, and the upper freezer compartment 23 are partitioned by a first heat insulating partition 30.

  In addition, the ice making chamber 24 and the upper freezing chamber 23 are partitioned by a second heat insulating partition 31.

  Further, the ice making chamber 24, the upper freezing chamber 23, and the lower freezing chamber 25 are partitioned by a third heat insulating partition 32.

  Since the second heat insulating partition part 31 and the third heat insulating partition part 32 are parts assembled after foaming of the heat insulating box body 21, foamed polystyrene is usually used as a heat insulating material, but the heat insulating performance and rigidity are improved. Therefore, the foam heat insulating material 29 may be used, and further, a vacuum heat insulating material having high heat insulating properties may be inserted to further reduce the partition structure.

  In addition, by securing the operating part of the door frame and making the second heat insulating partition part 31 and the third heat insulating partition part 32 thinner or abolished, a cooling air passage can be secured and the cooling capacity can be improved. You can also Moreover, the inside of the 2nd heat insulation partition part 31 and the 3rd heat insulation partition part 32 is hollowed, and it leads to reduction of material by setting it as an air path.

The lower freezer compartment 25 and the vegetable compartment 26 are partitioned by a fourth partition 33. A cooling chamber 40 is provided on the back of the heat insulating box body 21, and a representative one is provided in the cooling chamber 40. As shown, a cooler 39 that generates fin-and-tube cold air is disposed vertically in the vertical direction on the back surface of the lower freezer compartment 25 including the rear regions of the second and third partition portions 31 and 32 that are heat insulating partition walls. Has been. The cooler 39 is made of aluminum or copper.

  In the vicinity of the cooler 39 (for example, the upper space), the cold air generated by the cooler 39 is stored in each storage room of the refrigerator compartment 22, the ice making room 24, the upper freezer room 23, the lower freezer room 25, and the vegetable room 26 by a forced convection method. A cool air blowing fan 41 for blowing air is disposed, and a radiant heater 42 made of glass tube is provided in a lower space of the cooler 39 as a defrosting device for defrosting the frost attached to the cooler 39 and the cold air blowing fan 41 during cooling. It has been.

  The defroster is not particularly specified, and a pipe heater in close contact with the cooler 39 may be used in addition to the radiant heater.

  Next, cooling of the heat insulating box will be described. For example, when the freezer compartment 26 rises in temperature due to intrusion heat from outside air and door opening and closing, and the freezer compartment sensor (not shown) exceeds the start temperature, the compressor 37 is started and cooling is started. Is done.

  While the high-temperature and high-pressure refrigerant discharged from the compressor 37 finally reaches a dryer (not shown) disposed in the machine chamber 34, particularly in a heat radiating pipe installed in the outer box 27, It is cooled and liquefied by heat exchange with the outside air and the foam heat insulating material 29 in the warehouse.

  Next, the liquefied refrigerant is decompressed by the capillary tube 38, flows into the cooler 39, and exchanges heat with the internal air around the cooler 39. The cold air that has undergone heat exchange is blown into the cabinet by a nearby cool air blower fan 41 to cool the inside of the cabinet.

  Thereafter, the refrigerant is heated and gasified, and returns to the compressor 37. When the inside of the refrigerator is cooled and the temperature of the freezer compartment sensor (not shown) becomes equal to or lower than the stop temperature, the operation of the compressor 37 is stopped.

  Although the cool air blowing fan 41 may be directly disposed in the inner box 28, it is disposed in the second partition portion 31 assembled after foaming, and the manufacturing cost is reduced by performing block processing of the parts. You can also.

  The vacuum heat insulating material and the heat insulating box according to the present invention are provided with an uneven sealing part in which a corrugated unevenness is repeatedly formed on the surface of the outer cover material of the vacuum heat insulating material alternately plural times. By suppressing gas intrusion into the interior, it can exhibit excellent heat insulation performance for a long time, so refrigerators, vending machines, hot water supply containers, heat insulation materials for buildings, heat insulation materials for automobiles, cold insulation and heat insulation boxes, etc. It can be applied to such applications.

DESCRIPTION OF SYMBOLS 1 Vacuum heat insulating material 2 Core material 3 Adsorbent 4 Cover material 5 Protective layer 6 Gas barrier layer 7 Heat welding layer 8 Sealing part 9 Thick part 21 Heat insulation box 27 Outer box 28 Inner box 29 Foam heat insulation

Claims (3)

The outer periphery in the vicinity of the periphery of the two outer cover materials covering the core member by sealing the core member between the outer cover member having the metal foil layer and the outer cover member having the vapor deposition film layer facing each other. In the vacuum heat insulating material where the parts are heat-welded,
When the cross-section when cutting at least a part of the sealing portion in which the outer peripheral portions of the jacket material are thermally welded is cut by a plane perpendicular to the peripheral edge, the thermal welding layer located in the sealing portion is A thin-walled part having a thickness that is thinner than the peripheral part of the deepest part is formed in the deepest part of the concave part.
The heat welding layer of the sealing portion has a boundary surface with another layer on both surfaces, and the wave height of the undulation of the boundary surface of the surface having the metal foil layer of the recess has the deposited film layer of the recess. The deepest part of the portion of the concave surface that is larger than the wave height of the undulation of the boundary surface and is concave on the thermal welding layer side of one of the boundary surfaces, and the heat of the other boundary surface of the concave portion A vacuum heat insulating material in which the deepest portion of the concave portion on the weld layer side does not face. The vacuum heat insulating material according to claim 1, further comprising a gas adsorbent inside the vacuum heat insulating material. The vacuum heat insulating material between the outer box and the inner box by fixing one heat transfer surface of the vacuum heat insulating material having two heat transfer surfaces facing each other to a surface of the inner box facing the outer box. The heat insulation box which mounted the vacuum heat insulating material of Claim 1 or Claim 2 which filled the remaining space except the part with the foam heat insulating material.