Evacuable bag

Abstract

An evacuable bag is provided which can prevent any possible contact between laminated sheets so as to achieve a complete deaeration, and can be produced at low cost. Said evacuable bag 10 has a bag main body 1 composed of flexible non-breathable laminated sheets 11 , and provided with an air-outlet 2 which allows the bag main body 1 to communicate with the outside, and a closable opening 3 , the air-outlet 2 permits deaeration of the air in the bag main body 1 , the laminated sheet 11 consists of at least two layers, the outer layer is composed of non-breathable synthetic resin films 12, 13 , and the inner layer is a nonwoven layer formed with a mass of synthetic fibers and unevenness on the surface thereof, at least one part of the synthetic fibers constituting said nonwoven layer has thermoweldability.

1 . An evacuable bag having a bag main body constituted by flexible non-breathable laminated sheets, the bag main body comprising an air-outlet which permits the bag main body to communicate with the outside, and a closable opening, so that air subsisting within the bag main body may be evacuated through said air-outlet, wherein the laminated sheets consists of at least two layers, of which the outer layer is a combination of non-breathable synthetic resin films, the inner layer is a nonwoven layer made of a mass of synthetic fibers, and said nonwoven layer has thermoweldability.  
     
     
         2 . The evacuable bag as defined in  claim 1 , wherein said nonwoven layer has a ground texture and islet textures which lie scattered on the ground texture and arranged in a manner to rise from the ground texture, the surface of the nonwoven layer is rendered uneven by the ground texture and islet textures, and at least one cluster of unevenness is formed on the unwoven layer in a portion for air flow located near the air-outlet in the bag main body.  
     
     
         3 . The evacuable bag as defined in  claim 2 , wherein, referring to the unevenness as formed by the ground texture and islet textures, the average of the size difference H between the minimum size of the nonwoven layer in the ground texture in the direction of thickness of the nonwoven layer and the maximum size of the nonwoven layer in the area of the islet textures preferably ranges from 50 microns to 300 microns.  
     
     
         4 . The evacuable bag as defined in  claim 2 , wherein the synthetic fibers constituting the nonwoven layer is polyolefin synthetic fibers.  
     
     
         5 . The evacuable bag as defined in  claim 4 , wherein that the outer layer of the laminated sheet consists of nylon film and polyethylene film piled up in this order as viewed from the outside of the evacuable bag, in the nonwoven layer, the inner layer of the laminated sheet, said ground texture consists of polyethylene synthetic pulps and polyethylene-polypropylenes conjugate fibers, and said islet texture consists of polyethylene-polypropylene conjugate fibers and the two opposed nonwoven layers lying in the inner side are adhered to each other by heat-seal into a bag main body.