Heating pouch

Abstract

Provided is a heating pouch that can be heated in hot water and in a microwave. That is, the heating pouch includes a bag sheet provided with an easy peel pressure releasing seal part. In the pressure releasing seal part, one part of a sheet constituting the bag sheet and another part thereof are adhered so as to overlap each other. The pressure releasing seal part peels off when internal pressure rises, to form a degassing passage that communicates between an inside and an outside of the bag sheet. The pressure releasing seal part is provided with an easy peel layer and a skin layer. The skin layer is a resin layer constituting a seal surface that coats at least one of the one part and the other part of the sheet and which adheres to the other part which is not coated. The skin layer has a higher seal strength at 100 degrees centigrade than the easy peel layer.

1 . A heating pouch which is a bag sheet provided with an easily peelable seal part as a pressure release seal part, wherein
 the pressure release seal part adheres a part of the sheet constituting the bag sheet to the other part of the sheet so as to overlap each other, the pressure release seal part being peeled off at the time of an internal pressure rise so as to form a deaeration passage which communicates between the inside of the bag sheet and the outside of the bag sheet,   the pressure release seal part being provided with an easily peelable layer and a skin layer, the skin layer being a resin layer constituting a seal surface that covers at least any one of the part of the sheet and the other part and which adheres to the remaining uncovered part, and   the skin layer has higher seal strength at 100° C. than that of the easily peelable layer.   
     
     
         2 . A heating pouch which is a bag sheet provided with an easily peelable seal part as a pressure release seal part, wherein
 the pressure release seal part adheres a part of the sheet constituting the bag sheet to the other part of the sheet so as to overlap each other, the pressure release seal part being peeled off at the time of an internal pressure rise so as to form a deaeration passage which communicates between the inside of the bag sheet and the outside of the bag sheet, and   the pressure release seal part is provided with a flat part and a bead part, the flat part serving as a flat seal surface and the bead part being formed as projecting toward the inner surface side of the bag sheet rather than the flat part.   
     
     
         3 . The heating pouch according to  claim 1 , wherein
 the heating pouch is used for both microwave heating and heating in hot water.   
     
     
         4 . A heating pouch which is a bag sheet provided with an easily peelable seal part as a pressure release seal part, wherein
 the pressure release seal part adheres a part of the sheet constituting the bag sheet to the other part of the sheet so as to overlap each other, the pressure release seal part being peeled off at the time of an internal pressure rise so as to form a deaeration passage which communicates between the inside of the bag sheet and the outside of the bag sheet, the pressure release seal part having a pressure resistance strength 6 to 30 kPa at 100° C., wherein   the heating pouch comprises the pressure release seal part provided with at least any one of a first seal mechanism and a second seal mechanism, and is capable of heating in hot water and by the microwave,   the first seal mechanism provided with an easily peelable layer and a skin layer, the skin layer being a resin layer constituting a seal surface that covers at least any one of the part of the sheet and the other part which adheres to the remaining uncovered part, and   the second seal mechanism is provided with a flat part and a bead part, the flat part serving as a flat seal surface and the bead part being formed as projecting toward the inner surface side of the bag sheet rather than the flat part, the bead part having higher pressure resistance strength than that of the flat part.   
     
     
         5 . The heating pouch according to  claim 1 , wherein
 the pressure release seal part is provided with an easily peelable tape, the easily peelable tape being more easily peelable at a temperature higher than a room temperature than being peelable at a room temperature.   
     
     
         6 . The heating pouch according to  claim 1 , wherein
 at least any one of a part of the sheet constituting the bag sheet and the other part of the sheet constituting the bag sheet comprises an easily peelable layer.   
     
     
         7 . The heating pouch according to  claim 6 , wherein
 the pressure release seal part is not provided with a tape having the easily peelable layer but the sheet constituting the bag sheet itself is provided with the easily peelable layer.   
     
     
         8 . The heating pouch according to  claim 1 , wherein
 the skin layer is to be 3 to 40 μm thick.   
     
     
         9 . The heating pouch according to  claim 2 , wherein
 the heating pouch is used for both microwave heating and heating in hot water.   
     
     
         10 . The heating pouch according to  claim 2 , wherein
 the pressure release seal part is provided with an easily peelable tape, the easily peelable tape being more easily peelable at a temperature higher than a room temperature than being peelable at a room temperature.   
     
     
         11 . The heating pouch according to  claim 3 , wherein
 the pressure release seal part is provided with an easily peelable tape, the easily peelable tape being more easily peelable at a temperature higher than a room temperature than being peelable at a room temperature.   
     
     
         12 . The heating pouch according to  claim 4 , wherein
 the pressure release seal part is provided with an easily peelable tape, the easily peelable tape being more easily peelable at a temperature higher than a room temperature than being peelable at a room temperature.   
     
     
         13 . The heating pouch according to  claim 2 , wherein
 at least any one of a part of the sheet constituting the bag sheet and the other part of the sheet constituting the bag sheet comprises an easily peelable layer.   
     
     
         14 . The heating pouch according to  claim 3 , wherein
 at least any one of a part of the sheet constituting the bag sheet and the other part of the sheet constituting the bag sheet comprises an easily peelable layer.   
     
     
         15 . The heating pouch according to  claim 4 , wherein
 at least any one of a part of the sheet constituting the bag sheet and the other part of the sheet constituting the bag sheet comprises an easily peelable layer.   
     
     
         16 . The heating pouch according to  claim 3 , wherein
 the skin layer is to be 3 to 40 μm thick.