Resin packaging bag for microwave oven, method for heating same, method for filling resin packaging bag for microwave oven, and package

Abstract

A resin packaging bag for a microwave oven, which is used with a peripheral edge portion sealed, characterized in that: a front side of the packaging bag is formed from one resin film 2 and a rear side is formed from one resin sheet 1 ; and the resin film and the resin sheet comprise materials that, when a packaged body obtained by hermetically sealing moisture-containing contents between the resin film 2 and the resin sheet 1 is heated in a microwave oven with the rear side resin sheet as a bottom surface, are deformed by heat and pressure of steam generated from the contents such that the rear side resin sheet forms a recessed shape, and the recessed shape is entirely or partially maintained even after heating is terminated.

1 . A resin packaging bag for a microwave oven, which is used with a peripheral edge portion sealed, characterized in that: a front side of the packaging bag is formed from one resin film and a rear side is formed from one resin sheet; and the resin film and the resin sheet comprise materials that, when a packaged body obtained by hermetically sealing moisture-containing contents between the resin film and the resin sheet is heated in a microwave oven with the rear side resin sheet as a bottom surface, are deformed by heat and pressure of steam generated from the contents such that the rear side resin sheet forms a recessed shape, and the recessed shape is entirely or partially maintained even after heating is terminated. 
     
     
         2 . The resin packaging bag for a microwave oven according to  claim 1 , characterized in that the resin sheet is a resin laminated sheet obtained by adhering a resin film to a rear side surface thereof. 
     
     
         3 . A resin packaging bag for a microwave oven, which is used with a peripheral edge portion sealed, characterized in that: a front side of the packaging bag is formed from two resin films and a rear side is formed from one resin sheet; of the two resin films, a resin sheet-side resin film is adhered to a front side surface of the resin sheet; and the resin films and the resin sheet comprise materials that, when a packaged body obtained by hermetically sealing moisture-containing contents between the two resin films is heated in a microwave oven with the rear side resin sheet as a bottom surface, are deformed by heat and pressure of steam generated from the contents such that the rear side resin sheet forms a recessed shape, and the recessed shape is entirely or partially maintained even after heating is terminated. 
     
     
         4 . The resin packaging bag for a microwave oven according to  claim 3 , characterized in that the resin sheet and the resin sheet-side resin film are adhered weakly and the adhesive layer is weakly adhesive so that when the packaging body is heated in the microwave oven, the resin films housing the contents can be separated from the resin sheet. 
     
     
         5 . (canceled) 
     
     
         6 . (canceled) 
     
     
         7 . The resin packaging bag for a microwave oven according to  claim 1 , characterized in that the resin packaging bag for a microwave oven is formed by disposing moisture-containing contents between an elongated resin sheet, or an elongated resin sheet having a resin film adhered to a surface thereof that is to form an inner side of the packaging bag, and an elongated resin film, forming a four-way seal for each unit region in which the contents are disposed, and cutting out individual pieces using a cutter. 
     
     
         8 . The resin packaging bag for a microwave oven according to  claim 1 , characterized in that a slit is inserted into the resin sheet. 
     
     
         9 . The resin packaging bag for a microwave oven according to  claim 1 , characterized in that a shallow recessed portion is formed in advance near a central portion of the resin sheet. 
     
     
         10 . The resin packaging bag for a microwave oven according to  claim 1 , characterized in that respective pluralities of annular recessed portions and annular projecting portions are formed concentrically and alternately in advance in the resin sheet. 
     
     
         11 . (canceled) 
     
     
         12 . The resin packaging bag for a microwave oven according to  claim 1 , characterized in that means by which a steam vent opens automatically while heating in the microwave oven is provided on the surface of the resin film. 
     
     
         13 . The resin packaging bag for a microwave oven according to  claim 1 , characterized in that a part of a seal portion between the resin film and the resin sheet is formed from a weak seal so that the weak seal part peels away during heating in the microwave oven, thereby opening as a steam vent. 
     
     
         14 .- 17 . (canceled) 
     
     
         18 . A roll feeding type automatic filling method characterized by comprising, for filling the resin packaging bag for a microwave oven according to  claim 7  with moisture-containing contents, feeding a resin sheet, or a resin sheet having a resin film adhered to a surface thereof that is to form an inner side of the packaging bag, from a roll, disposing moisture-containing contents on the resin sheet, overlaying a resin film fed from another roll so as to cover the contents, sealing respective side surface portions and then hermetically packaging by forming end seals at opening portions in two locations for each unit region in which the contents are disposed, and then cutting out individual pieces using a cutter. 
     
     
         19 . A packaged body obtained by filling the resin packaging bag for a microwave oven according to  claim 1  with moisture-containing contents and hermetically sealing the resin packaging bag for a microwave oven. 
     
     
         20 . The resin packaging bag for a microwave oven according to  claim 3 , characterized in that the resin packaging bag for a microwave oven is formed by disposing moisture-containing contents between an elongated resin sheet, or an elongated resin sheet having a resin film adhered to a surface thereof that is to form an inner side of the packaging bag, and an elongated resin film, forming a four-way seal for each unit region in which the contents are disposed, and cutting our individual pieces using a cutter. 
     
     
         21 . The resin packaging bag for a microwave oven according to  claim 3 , characterized in that a slit is inserted into the resin sheet. 
     
     
         22 . The resin packaging bag for a microwave oven according to  claim 3 , characterized in that a shallow recessed portion is formed in advance near a central portion of the resin sheet. 
     
     
         23 . The resin packaging bag for a microwave oven according to  claim 7 , characterized in that a shallow recessed portion is formed in advance near a central portion of the resin sheet. 
     
     
         24 . The resin packaging bag for a microwave oven according to  claim 20 , characterized in that a shallow recessed portion is formed in advance near a central portion of the resin sheet. 
     
     
         25 . The resin packaging bag for a microwave oven according to  claim 3 , characterized in that respective pluralities of annular recessed portions and annular projecting portions are formed concentrically and alternately in advance in the resin sheet. 
     
     
         26 . The resin packaging bag for a microwave oven according to  claim 7 , characterized in that respective pluralities of annular recessed portions and annular projecting portions are formed concentrically and alternately in advance in the resin sheet. 
     
     
         27 . The resin packaging bag for a microwave oven according to  claim 20 , characterized in that respective pluralities of annular recessed portions and annular projecting portions are formed concentrically and alternately in advance in the resin sheet. 
     
     
         28 . A roll feeding type automatic filling method characterized by comprising, for filling the resin packaging bag for a microwave oven according to  claim 20  with moisture-containing contents, feeding a resin sheet, or a resin sheet having a resin film adhered to a surface thereof that is to form an inner side of the packaging bag, from a roll, disposing moisture-containing contents on the resin sheet, overlaying a resin film fed from another roll so as to cover the contents, sealing respective side surface portions and then hermetically packaging by forming end seals at opening portions in two locations for each unit region in which the contents are disposed, and then cutting out individual pieces using a cutter. 
     
     
         29 . A packaged body obtained by filling the resin packaging bag for a microwave oven according to  claim 3  with moisture-containing contents and hermetically sealing the resin packaging bag for a microwave oven. 
     
     
         30 . A packaged body obtained by filling the resin packaging bag for a microwave oven according to  claim 7  with moisture-containing contents and hermetically sealing the resin packaging bag for a microwave oven. 
     
     
         31 . A packaged body obtained by filling the resin packaging bag for a microwave oven according to  claim 20  with moisture-containing contents and hermetically sealing the resin packaging bag for a microwave oven.