Evacuable valve, evacuable bag, and production process thereof

Abstract

The present invention provides an evacuable valve which does not need a separate member such as a covering for closing an air-through portion and has a small portion that projects therefrom. A valve body 5 in the evacuable valve can securely contact the valve body contacting portion 32 a and close an air-through portion 33 where the valve body 5 covers, thereby keeping the evacuated state for a long period of time. A valve seat portion 32 of the back face of an evacuable valve can at least partly rest in the depressed area 7 of the front face of the other valve, thereby being able to pile up the evacuable valves 1 . In the production process of evacuable bags that are provided with the evacuable valve, piling and storage of the evacuable valves do not need excessive space and much effort.

1 . An evacuable valve comprising a body member provided with an air-through portion passing from its front face to its back face, and a filmy valve body disposed so as to open and close the air-through portion, wherein 
 the body member includes a valve seat portion for mounting the valve body, said valve seat portion having a valve body contacting area which slants toward the front face as running from the central part thereof to the periphery, and    the air-through portion is arranged to radiate in the valve seat portion with a view from above, and    the valve body is securely fixed to the central part of the valve seat portion and is movable close to or away from the valve body contacting face by floating except for the fixed portion, and closes the air-through portion while contacting the valve body contacting area.    
   
   
       2 . The evacuable valve of  claim 1 , wherein 
 it includes a depressed area on the front face thereof,    whereby one evacuable valve can at least partly rest in the depressed area of the other valve,    and accordingly the evacuable valves can be piled up by putting the front face of one evacuable valve and the back face of the other evacuable valve together.    
   
   
       3 . An evacuable bag made of flexible resin film and of internal sealable structure, wherein 
 the evacuable valve of  claim 1  is mounted to communicate between the outside and inside of the bag through the air-through portion formed on a valve seat portion of the evacuable valves,    whereby the bag may be evacuated and keep the evacuated state.    
   
   
       4 . A production process of the evacuable bag comprising steps of: 
 opening a valve mounting hole in the flexible resin film;    taking one from the piled evacuable valves of  claim 1;     positioning the evacuable valve to coincide with the valve mounting hole; and    bonding the evacuable valves to the film.    
   
   
       5 . An evacuable bag made of flexible resin film and of internal sealable structure, wherein 
 the evacuable valve of  claim 2  is mounted to communicate between the outside and inside of the bag through the air-through portion formed on a valve seat portion of the evacuable valves,    whereby the bag may be evacuated and keep the evacuated state.    
   
   
       6 . A production process of the evacuable bag comprising steps of: 
 opening a valve mounting hole in the flexible resin film;    taking one from the piled evacuable valves of  claim 2;     positioning the evacuable valve to coincide with the valve mounting hole; and    bonding the evacuable valves to the film.