Bag for vacuum sealing and material for the bag

Abstract

A bag for vacuum sealing which has a bag body composed of a first sheet 11 and a second sheet 12, which have thermally fusible synthetic resin films 11 a and 12 a on at least the respective inner surfaces, and a non-woven fabric 15 which is a gas-permeable fiber structure formed of thermally fusible fibers. The sheets 11 and 12 are thermally fused together at both sides a and a lower side b, and the unfused upper side becomes an open side 13 of the bag body. The non-woven fabric 15 is bonded or fused with the inner surface of either one of the sheets 11 and 12. Food, clothing or the like is put in a space 16 between the sheet and the non-woven fabric 15, and air is extracted from the interior of the bag body through the open side 13. The open side 13 is thermally sealed in the portion with a width between “c” and “c”. During the air extraction, near the open side 13, the air inside the bag body is sucked through the non-woven fabric 15 in a direction perpendicular to the thickness of the fabric 15. For the thermal sealing of the open side 13, the fibers of the non-woven fabric 15 at the portion 13 are melted and fused with the sheets 11 and 12. Instead of the non-woven fabric 15, a finished fabric or a woven cloth may be used, and such a fabric or cloth may not be bonded or fused with the inner surfaces of the sheets 11 and 12.

1 . A bag for vacuum sealing, comprising: 
 a bag body comprising a first sheet and a second sheet, each of which has a thermally fusible synthetic resin film on at least an inner surface; and    a non-woven fabric, a finished fabric or a woven cloth which is a gas-permeable fiber structure formed of thermally fusible synthetic fibers,    wherein: 
 the bag body has three closed sides and one open side;  
 the non-woven fabric, the finished fabric or the woven cloth is located between the first sheet and the second sheet;  
 when air is extracted from an interior of the bag body through the open side, the air in the bag body is sucked through the non-woven fabric, the finished fabric or the woven cloth in a direction perpendicular to a thickness of the non-woven fabric, the finished fabric or the woven cloth;  
 after air extraction from the interior of the bag body, the open side is heated so that the fibers, at the open side, of the non-woven fabric, the finished fabric or the woven cloth are melted, whereby the open side is closed.  
   
     
     
         2 . A material for a bag according to  claim 1 , the material comprising: 
 a long stack of a first sheet and a second sheet, each of which has a thermally fusible synthetic resin film on at least an inner surface; and    a non-woven fabric, a finished fabric or a woven cloth which is a gas-permeable fiber structure formed of thermally fusible synthetic fibers,    wherein: 
 the first and second sheets are fused together at both sides along a length direction; and  
 the non-woven fabric, the finished fabric or the woven cloth is located between the first sheet and the second sheet.