Vacuum heat insulator, hot insulating device using vacuum heat insulator, and electric water heater

Abstract

In this vacuum heat insulator, an excellent heat insulating performance is obtained even at high temperature, and this excellent heat insulating performance is maintained for a long period. The hot insulating device and electric water heater using this vacuum heat insulator exhibit an excellent hot insulating performance, and are decreased in the power consumption for hot insulation. The vacuum heat insulator includes a laminate bag, and an insulating core placed in the laminate bag, and the inside of the laminate bag is evacuated in a vacuum state. The laminate bag is made of a laminate film. The laminate film includes a support layer, a deposition layer evaporated on the surface of the support layer, a protective layer placed at the surface side of the deposition layer, and a seal layer placed at the back side of the deposition layer. The deposition layer is formed of at least one material of metal and metal oxide. In this laminate film, (i) the support layer has a plastic film having a glass transition point of 87° C. or higher, (ii) the protective layer has a plastic film having a glass transition point of 87° C. or higher, (iii) the deposition layer has a property of transmitting high frequency magnetic field or (iv) the laminate bag has a seal portion formed by junction of the seal layer, and the laminate film further as a metal f oil placed at a position excluding the seal portion.

1 - 6 . (canceled)  
   
   
       7 . A vacuum heat insulator comprising: 
 a laminate bag, and an insulating core placed in said laminate bag,    wherein an inside of said laminate bag is evacuated to vacuum,    said laminate bag is made of a laminate film,    said laminate film includes a first support layer, a first deposition layer evaporated on    said first support layer, a second support layer, and a second deposition layer evaporated on said second support layer,    each one of said first deposition layer and second deposition layer has at lest one of metal and metal oxide, and    each one of said first support layer and second support layer has a plastic film having a glass transition point of 87° C. or higher,    
   
   
       8 . The vacuum heat insulator of  claim 7 , wherein the surface of the first deposition layer and the surface of the second deposition layer are mutually adhered to each other.  
   
   
       9 - 18 . (canceled)  
   
   
       19 . A vacuum heat insulator comprising: 
 a laminate bag, and an insulating core placed in said laminate bag,    wherein an inside of said laminate bag is evacuated to vacuum,    said laminate bag is made of a laminate film,    said laminate film includes a base material layer, a deposition layer evaporated on said base material layer, a metal foil, and a seal layer,    said laminate bag as a seal portion positioned at the end of said laminate film,    said seal portion is formed by bonding of said seal layer, and    said metal foil is positioned at a position excluding at least a part of said seal portion.    
   
   
       20 . The vacuum heat insulator of  claim 19 , wherein said deposition layer has an aluminum deposition layer, and said metal foil has an aluminum foil.  
   
   
       21 . (canceled)  
   
   
       22 . The vacuum heat insulator of  claim 19 , 
 wherein said base material layer has a first base material layer and a second base material layer,    said deposition layer has a first deposition layer and a second deposition layer, and    said first deposition layer and second deposition layer are adhered face to face.    
   
   
       23 - 25 . (canceled)  
   
   
       26 . The vacuum heat insulator of  claim 22 , wherein said metal foil is laminated between said first deposition layer and second deposition layer.  
   
   
       27 . The vacuum heat insulator of  claim 19 , wherein said base material layer and deposition layer are laminated between said metal foil and seal layer.  
   
   
       28 - 64 . (canceled)