Bag type squeeze bottle

Abstract

A high performance squeeze bottle dispenser includes an internal product-containing bag which is in fluid communication with a dispensing nozzle. The dispensing nozzle is airtight to prevent air from escaping back into the bag when pressurization of the bottle is released. A one-way air valve in a wall of the bottle admits air into the interior of the bottle around the outside of the product bag to provide a pumping action which pressurizes the interior of the bottle to cause product expulsion through the nozzle. An inversion collar projects into the bag so that the bag folds inwardly upon itself and up into the collar as product is expelled. The collar may also include an upper inside dome-shaped surface which matches the shape of the inside of the bottom of the bag to achieve near-complete expulsion of product to reduce waste.

1 . A dispenser, comprising: 
 a non-rigid airtight bottle with sidewalls adapted for manual compression;    a cap located at the top of said bottle, said cap including a liquid dispensing nozzle, said nozzle configured to prevent air from entering the bottle;    a flexible bag for holding a liquid, said bag located within said bottle and extending downward from said cap, said bag being in fluid communication with said dispensing nozzle;    a collar located within said bag and extending downward from a top of said bottle approximately one-half of the bag's length; and    a one-way, air-admitting valve located on a wall of the bottle such that successive amounts of the liquid are dispensed from said nozzle as said bottle is repeatedly squeezed.    
   
   
       2 . The dispenser of  claim 1  wherein said bag is tightly fitted to an outside wall of said collar.  
   
   
       3 . The dispenser of  claim 1  wherein said collar and said bag are substantially cylindrical.  
   
   
       4 . The dispenser of  claim 1  wherein said collar is secured between said cap and a mouth of said bottle.  
   
   
       5 . The dispenser of  claim 1  wherein said cap is threadably connected to said bottle.  
   
   
       6 . The dispenser of  claim 1  wherein said nozzle is a duckbill valve.  
   
   
       7 . The dispenser of  claim 1  wherein said air-admitting valve is an umbrella valve.  
   
   
       8 . The dispenser of  claim 7  wherein said air-admitting valve resides within a concavity in the base of said bottle.  
   
   
       9 . The dispenser of  claim 1  wherein said cap has an inside surface with a shape which matches the shape of an inside surface of the bottom of the bag.  
   
   
       10 . The dispenser of  claim 1  wherein an outside dimension of the bag is tapered inwardly toward the bottom.  
   
   
       11 . The dispenser of  claim 10  wherein an inside surface of the collar is inwardly tapered toward the top in dimensional correspondence with the inside dimensions of the bag such that the inside surface of the bag is in close physical contact with inside surfaces of the cap and the collar when the bag inverts against the inside wall of the collar at a position of substantially complete expulsion of liquid from the bag.  
   
   
       12 . The dispenser of  claim 2  wherein the bag is fixed to the outside wall of the collar by the elastic constriction of the bag against the collar.  
   
   
       13 . The dispenser of  claim 11  wherein the inside surface of the bag is in substantial contact with the inside surfaces of the collar and the cap by elastic deformation of the bag.  
   
   
       14 . A dispenser comprising: 
 an airtight chamber adapted for manual pressurization;    a dispensing nozzle in fluid communication with an interior volume of said chamber, said nozzle configured to prevent air from entering the chamber;    an elongate flexible bag for holding a flowable substance, said bag located within said chamber and being in fluid communication with said dispensing nozzle;    a collar located within said elongate bag extending downwardly from a top of said bag approximately one-half of the bag's length; and    a one-way air-admitting valve located on a wall of said chamber such that the flowable substance is dispensed from said nozzle as said chamber is pressurized.    
   
   
       15 . The dispenser of  claim 14  wherein said collar includes an interior upper inside surface which matches the shape of an inside surface of a bottom of the bag.  
   
   
       16 . The dispenser of  claim 1  wherein said collar is substantially rigid.  
   
   
       17 . The dispenser of  claim 1  wherein the cap is removable.  
   
   
       18 . The dispenser of  claim 1  wherein said wall of the bottle is a bottom wall.  
   
   
       19 . The dispenser of  claim 14  wherein said collar is substantially rigid.