Single-use one-way valve for food package that emits sound signal at sufficient heating

Abstract

The present invention concerns a single-use valve ( 1 ) for mounting on a package ( 2 ), particularly food packages the contents which are to be heated in a microwave oven ( 3 ). The valve ( 1 ) is arranged to open in response to an excess pressure generated inside the package ( 2 ) upon heating of said package ( 2 ). The valve comprises an opening ( 4 ) formed in the package ( 2 ), on top of which opening ( 4 ) an adhesive layer ( 5 ) is applied. The valve ( 1 ) is also arranged to emit a sound signal when subjected to said pressure load.

1 . A single-use valve for mounting on a package, particularly food packages the contents of which are to be heated in a microwave oven, said valve arranged to open in response to an excess pressure generated inside the package upon heating of the latter, wherein that valve comprises an opening formed in the package, and adhesive layer being applied on top of said opening, and in that said valve is arranged to emit a sound signal when subjected to said pressure load.  
   
   
       2 . A valve as claimed in  claim 1 , wherein said opening is in the form of a slit.  
   
   
       3 . A valve as claimed in  claim 2 , wherein said slit is straight.  
   
   
       4 . A valve as claimed in  claim 1 , wherein at least one portion of the adhesive layer comprises and adhesive that is suitable for use in conjunction with foodstuffs.  
   
   
       5 . A valve as claimed in  claim 1 , wherein said adhesive layer is a tape.  
   
   
       6 . A valve as claimed in  claim 5 , wherein said tape is resilient.  
   
   
       7 . A valve as claimed in  claim 1 , wherein said adhesive layer is a label.  
   
   
       8 . A valve as claimed in  claim 1 , wherein said packaging material in which said valve provided, consists of a non-directional laminate.