[특허]Vacuum heat insulation material and cold reserving apparatus with the same

Panasonic Corporation

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Vacuum heat insulation material and cold reserving apparatus with the same

국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	A47B-096/00
미국특허분류(USC)	312/005; 312/406.1; 312/406.2
출원번호	UP-0569390 (2005-06-02)
등록번호	US-7762634 (2010-08-13)
우선권정보	JP-2004-165281(2004-06-03); JP-2004-195182(2004-07-01); JP-2004-215182(2004-07-23); JP-2004-305342(2004-10-20)
국제출원번호	PCT/JP2005/010159 (2005-06-02)
§371/§102 date	20061120 (20061120)
국제공개번호	WO05/119118 (2005-12-15)
발명자 / 주소	Tenra, Tomohisa Hashida, Masamichi Hashimoto, Kazuo
출원인 / 주소	Panasonic Corporation
대리인 / 주소	RatnerPrestia
인용정보	피인용 횟수 : 20 인용 특허 : 2

초록
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A vacuum heat insulation material has a covering material which is a lamination body including a sealant layer, a metal foil layer, a first plastic film layer, and a second plastic film layer which are laminated in this order from inside to outside via adhesive layers. When a foreign body is pierced into the vacuum heat insulation material, the propagation of breakage caused by the piercing is blocked somewhere inside the lamination body, thereby preventing the formation of through-pinholes. This results in the provision of a high-quality vacuum heat ins...

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The invention claimed is: 1. A vacuum heat insulation material comprising at least a core material and a covering material, the covering material covering the core material and being vacuum sealed, wherein the covering material is a lamination body including at least two plastic film layers, one of a metal layer and a ceramic-deposited layer, and adhesive layers for joining therebetween, and the lamination body has a stress-relieving structure in inner layers thereof, the stress-relieving structure being able to prevent penetration and propagation of breakage in a direction perpendicular to the lamination body. 2. The vacuum heat insulation material of claim 1, wherein in a condition where glass shot is placed on the core material and the covering material is vacuumed to a pressure not more than 13 Pa, when the glass shot pierces and breaks a first plastic film, the stress-relieving structure can block breakage of the first plastic film from propagating to a second plastic film outwardly adjacent to the first plastic film in the inner layers of the lamination body. 3. The vacuum heat insulation material of claim 1, wherein when the lamination body is subjected to a compressive stress in the direction perpendicular thereto, one of interfaces of the lamination body is peeled. 4. The vacuum heat insulation material of claim 3, wherein the interface to be peeled is an interface between one of the adhesive layers and another layer. 5. The vacuum heat insulation material of claim 3, wherein the metal layer is a deposited metal layer, and the interface to be peeled is an interface between the deposited metal layer and another layer. 6. The vacuum heat insulation material of claim 3, wherein the plastic film layers include coextruded multilayer films, and the interface to be peeled is an interface in the coextruded films. 7. The vacuum heat insulation material of claim 3, wherein the lamination body has an interface with a shear strength of 100 to 300 N/cm2. 8. The vacuum heat insulation material of claim 3, wherein the metal layer is a deposited metal layer, and an interface between the deposited metal layer and another layer has a shear strength of 100 to 300 N/cm2. 9. The vacuum heat insulation material of claim 3, wherein the plastic film layers include coextruded multilayer films and an interface in the coextruded films has a shear strength of 100 to 300 N/cm2. 10. The vacuum heat insulation material of claim 3, wherein one of the adhesive layers is formed in a grid pattern. 11. The vacuum heat insulation material of claim 3, wherein the lamination body has an interface with a peel strength of 20 to 200 N/m. 12. The vacuum heat insulation material of claim 3, wherein the plastic film layers include coextruded multilayer films, and an interface in the coextruded films has a peel strength of 20 to 200 N/m. 13. The vacuum heat insulation material of claim 3, wherein the metal layer is a deposited metal layer, and an interface between the deposited metal layer and another layer has a peel strength of 20 to 200 N/m. 14. The vacuum heat insulation material of claim 1, wherein when the lamination body is subjected to a compressive stress in the direction perpendicular thereto, one of the plastic films or one of the joining layers is broken. 15. The vacuum heat insulation material of claim 14, wherein the one of the plastic films or the one of the joining layers has a shear strength of 100 to 300 N/cm2. 16. The vacuum heat insulation material of claim 14, wherein the one of the joining layers is lower in modulus of elasticity than the plastic films. 17. The vacuum heat insulation material of claim 15, wherein the one of the joining layers is made of urethane resin. 18. The vacuum heat insulation material of claim 17, wherein the urethane resin contains a polyisocyanate and a polyester polyol, and an equivalent ratio of polyisocyanate to polyester polyol is not less than 1 and not more than 3. 19. The vacuum heat insulation material of claim 1, wherein at least one of the joining layers is made of urethane resin containing a polyisocyanate and a polyester polyol, and an equivalent ratio of polyisocyanate to polyester polyol is not less than 1 and not more than 3. 20. The vacuum heat insulation material of claim 1, wherein at least one of the joining layers is made of urethane resin containing an aliphatic polyisocyanate. 21. The vacuum heat insulation material of claim 1, wherein at least one of the joining layers is made of urethane resin containing an aliphatic polyester polyol and an aliphatic polyisocyanate. 22. A cold reserving apparatus used in a temperature range not more than a normal temperature, the cold reserving apparatus comprising an insulating box and an insulating door body, and in at least one of the insulating box and the insulating door body, a vacuum heat insulation material being provided between an outer case and an inner case which have a space therebetween filled with rigid resin foam, the vacuum heat insulation material comprising at least a core material and a covering material, the covering material covering the core material and being vacuum sealed, wherein the covering material is a lamination body including at least two plastic film layers, one of a metal layer and a ceramic-deposited layer, and adhesive layers for joining therebetween, and the lamination body has a stress-relieving structure in inner layers thereof, the stress-relieving structure being able to prevent penetration and propagation of breakage in a direction perpendicular to the lamination body. 23. The cold reserving apparatus of claim 22, wherein when the lamination body is subjected to a compressive stress in a direction perpendicular thereto, one of interfaces of the lamination body is peeled in the covering material. 24. The cold reserving apparatus of claim 22, wherein when the lamination body is subjected to a compressive stress in a direction perpendicular thereto, one of the plastic films or one of the adhesive layers is peeled in the covering material. 25. The cold reserving apparatus of claim 22, wherein in the covering material, at least one of the joining layers is made of urethane resin containing a polyisocyanate and a polyester polyol, and an equivalent ratio of polyisocyanate to polyester polyol is not less than 1 and not more than 3.

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Vacuum heat insulation material and cold reserving apparatus with the same

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