Apparatus for applying plasticizer to fibrous filter material in filter rod making machines

Apparatus for applying fluid plasticizer to the filaments in layers of fibrous filter material, comprising advancing means for moving a foraminous layer of fibrous filter material along a predetermined path toward, through and beyond an impregnating station, said advancing means including variable-speed drive means for the layer of fibrous material;

• a source of plasticizer;
• an atomizing device located at said station at one side of said path and connected with said source so as to directly propel against each zone of each successive increment of the moving layer at said station a spray of particles of finely distributed plasticizer whereby some of the particles adhere to the filaments and the remaining particles penetrate across such increments;
• means for regulating the rate of delivery of plasticizer from said source to said atomizing device as a function of changes in the speed of the layer at said station;
• and intercepting means having a surface immediately adjacent to said path opposite said atomizing device so that successive increments of the moving layer sweep along said surface and entrain at least some of said remaining particles.

Apparatus for applying fluid plasticizer to the filaments in layers of fibrous filter material, comprising advancing means for moving a foraminous layer of fibrous filter material along a predetermined path towards, through and beyond an impregnating station;

• a source of plasticizer;
• an atomizing device located at said station at one side of said path and connected with said source so as to directly propel against each zone of each successive increment of the moving layer at said station a spray of particles of finely distributed plasticizer whereby some particles penetrate across such increments;
• intercepting means having a surface immediately adjacent to said path opposite said atomizing device so that successive increments of the moving layer sweep along said surface and entrain at least some of said remaining particles;
• and a receptacle provided at said station and defining at least one suction chamber for collection of those particles of atomized plasticizer which are not entrained by the moving layer of filter material.

Apparatus for applying fluid plasticizer to the filaments in layers of fibrous filter material, comprising advancing means for moving a foraminous layer of fibrous filter material along a predetermined path toward, through and beyond an impregnating station;

• a pneumatic banding device closely adjacent to and located upstream of said station, said banding device including nozzle means arranged to discharge streams of a gaseous fluid across successive increments of the moving layer of filter material and to thereby increase the width of such increments prior to entry into said station;
• a source of plasticizer;
• an atomizing device located at said station at one side of said path and connected with said source so as to directly propel against each zone of each successive increment of the moving layer at said station a spray of particles of finely distributed plasticizer whereby some of the particles adhere to the filaments and the remaining particles penetrate across such increments;
• and intercepting means having a surface immediately adjacent to said path opposite said atomizing device so that successive increments of the moving layer sweep along said surface and entrain at least some of said remaining particles.