Machine for producing foam within a bag

Abstract

A machine produces foam-in-bag from foam precursors mixed within the bag. The machine comprises a base and a shell. The base and shell are moveable relative each other between a base/shell disengaged position and a base/shell engaged position. In the base/shell engaged position, the base and shell divide the bag so that a mixing chamber is isolated from the remainder portion of the bag. First and second nozzles inject foam precursors into the mixing chamber. A mixer engages the mixing chamber to provide mixing energy to facilitate the foam reaction.

1 . A machine useful for mixing first and second foam precursors to produce foam within a bag, the machine comprising:
 a base and a shell moveable relative each other between:
 (i) a base/shell disengaged position, in which the base and shell are spaced apart to permit insertion of the bag between the base and shell, and 
 (ii) a base/shell engaged position in which the shell and base press together to hold the bag between the base and shell and to divide the bag into (1) a mixing chamber and (2) a remainder portion so that the mixing chamber is isolated from the remainder portion of the bag; 
   a first nozzle adapted to inject the first foam precursor into the mixing chamber within the bag;   a second nozzle adapted to inject the second foam precursor into the mixing chamber within the bag; and   a mixer adapted to engage the mixing chamber of the bag to provide mixing energy to the first and second foam precursors within the mixing chamber of the bag when the base and shell are in the base/shell engaged position, thereby facilitating the foam reaction between the first and second foam precursors.   
     
     
         2 . The machine of  claim 1  wherein the shell comprises a bottom jaw such that when the base and shell are in the base/shell engaged position, the bottom jaw is adapted to press together with the base to hold the bag between the base and bottom jaw to divide the bag into the mixing chamber and the remainder portion. 
     
     
         3 . The machine of  claim 2  wherein the bottom jaw has a concave curved bottom region. 
     
     
         4 . The machine of  claim 3  wherein the bottom jaw has a U-shaped configuration. 
     
     
         5 . The machine of  claim 2  further comprising a top jaw movable relative the bottom jaw and adapted to move to a top jaw engaged position cooperating with the bottom jaw to form a peripheral enclosure about the mixing chamber when the base and shell are in base/shell engaged position. 
     
     
         6 . The machine of  claim 5  wherein:
 the bottom jaw has a U-shaped configuration; and 
 the top jaw is adapted to extend across the open top of the U-shape configuration of the bottom jaw to form the peripheral enclosure. 
 
     
     
         7 . The machine of  claim 1  wherein the mixer is adapted to reciprocatingly engage the mixing chamber of the bag to provide the mixing energy. 
     
     
         8 . The machine of  claim 1  wherein the mixer is adapted to rotatively engage the mixing chamber of the bag to provide the mixing energy. 
     
     
         9 . The machine of  claim 1  wherein the mixer is mounted to the shell. 
     
     
         10 . The machine of  claim 1  wherein the mixer comprises one or more mixing rollers adapted to engage the mixing chamber of the bag. 
     
     
         11 . The machine of  claim 10  wherein the mixer is adapted to circulate the one or more mixing rollers in a plane generally parallel with the surface of the mixing chamber of the bag. 
     
     
         12 . The machine of  claim 10  wherein the one or more mixing rollers are adapted to roll along the surface of the bag. 
     
     
         13 . The machine of  claim 1  wherein the mixing chamber has a bottom region and the mixer is adapted to engage the bottom region of the mixing chamber. 
     
     
         14 . The machine of  claim 1  wherein:
 the shell comprises a bottom jaw such that when the base and shell are in the base/shell engaged position, the bottom jaw is adapted to press together with the base to hold the bag between the base and bottom jaw to divide the bag into the mixing chamber and the remainder portion; 
 the bottom jaw has a concave curved bottom region so that in the base/shell engaged position the mixing chamber of the bag has a corresponding concave curved bottom region; 
 the mixer comprises one or more mixing rollers adapted to engage the mixing chamber of the bag; and 
 the mixer is adapted to circulate the one or more mixing rollers along a path having a portion corresponding to the concaved curved bottom region of the mixing chamber, whereby the mixer is adapted to provide mixing energy to liquids that collect in the concave curved bottom region of the mixing chamber. 
 
     
     
         15 . The machine of  claim 1  wherein the first and second nozzles are fixedly mounted to the base. 
     
     
         16 . A method of making a foam-in-bag cushion comprising:
 inserting a bag in the machine of  claim 1  between the base and shell in the base/shell disengaged position and beneath the first and second nozzles;   moving the base and shell relative each other to the base/shell engaged position to divide the bag into a mixing chamber and a remainder portion, wherein the mixing chamber is isolated from the remainder portion of the bag;   injecting a first foam precursor from the first nozzle into the mixing chamber within the bag;   injecting a second foam precursor from the second nozzle into the mixing chamber within the bag; and   activating the mixer to engage the mixing chamber of the bag to provide mixing energy to the first and second foam precursors within the mixing chamber.   
     
     
         17 . The method of  claim 16  further comprising subsequently moving the base and shell to the base/shell disengaged position so that at least a portion of the reacting first and second foam precursors move to the remainder portion of the bag. 
     
     
         18 . A method of making a foam-in-bag cushion comprising:
 inserting a bag in the machine of  claim 5  between the base and shell in the base/shell disengaged position and beneath the first and second nozzles;   moving the base and shell relative each other to the base/shell engaged position and to hold the bag between the base and bottom jaw to divide the bag into a mixing chamber and a remainder portion, wherein the mixing chamber is isolated from the remainder portion of the bag;   injecting a first foam precursor from the first nozzle into the mixing chamber within the bag;   injecting a second foam precursor from the second nozzle into the mixing chamber within the bag;   subsequently moving the top jaw to an engaged position cooperating with the bottom jaw to form a peripheral enclosure about the mixing chamber; and   activating the mixer to engage the mixing chamber of the bag to provide mixing energy to the first and second foam precursors within the mixing chamber.   
     
     
         19 . The method of  claim 18  further comprising subsequently moving the base and shell to the base/shell disengaged position so that at least a portion of the reacting first and second foam precursors move to the remainder portion of the bag.