Plastic bag for vacuum sealing

Abstract

A plastic bag for vacuum sealing that has a folding line formed during fabrication of a plastic bag to form an air channel communicating with a housing chamber so that when the plastic bag is coupled on a vacuum sealing machine remaining air in the housing chamber may be fully extracted before the plastic bag is sealed.

1 . A plastic bag to be coupled with a vacuum sealing machine, comprising: 
 a first air impermeable layer and a second air impermeable layer bonded to form a housing chamber to hold goods having at least one bag opening communicating with the housing chamber; and    at least one air channel selectively formed on the first air impermeable layer or the second air impermeable layer by forming at least one folding line on the first air impermeable layer or the second air impermeable layer that communicates the bag opening with the housing chamber;    wherein the plastic bag is coupled with the vacuum sealing machine so that remaining air in the housing chamber is extracted by the sealing machine through the air channel, and the bag opening is sealed thereafter.    
   
   
       2 . The plastic bag of  claim 1 , wherein the folding line is a single folding line to form the air channel outside the housing chamber.  
   
   
       3 . The plastic bag of  claim 1 , wherein the folding line is double folding lines to form two air channels outside the housing chamber that have a joint passage on the front end of the housing chamber.  
   
   
       4 . The plastic bag of  claim 1 , wherein the folding line is double folding lines to form two air channels outside the housing chamber to communicate respectively with the housing chamber.  
   
   
       5 . The plastic bag of  claim 1 , wherein the folding line is formed respectively on the first air impermeable layer and the second air impermeable layer to form respectively an air channel on the first air impermeable layer and the second air impermeable layer.