Method and apparatus for making a hollow filter and a filter rod
AssigneeLiggett & Myers Incorporated
InventorNed A. Sigmon
Life of this patent
Estimating the term…
Abstract
The apparatus is constructed to produce a hollow filter rod. The apparatus includes a mandrel through which a supplied length of tubing is passed, a nozzle surrounding the mandrel for shaping a stream of fibrous filter material about the mandrel and a forming means for enveloping a web of paper about the fibrous filter material and the tubing to produce the filter rod. The mandrel can be adjusted relative to the forming means to ensure an accurate centering of the tubing within the filter rod. The hollow filter includes a rigid non-deformable tube defining a smoke passage having a draw resistance to control the amount of unfiltered smoke, a concentric layer of filter material and a perforated outer wrap for passage of air into the layer of filter material.
Claims10
An apparatus for making a filter rod for cigarette filter tips comprising
- first means for supplying a stream of tubing;
- a mandrel having a passageway for passage of a supplied stream of tubing therethrough;
- second means for supplying a stream of fibrous cigarette filter material
- third means circumferentially enveloping said mandrel for directing a supplied stream of fibrous filter material circumferentially about said mandrel;
- fourth means for supplying a stream of paper;
- forming means circumferentially enveloping the delivery end of said mandrel and positioned downstream of said third means for receiving the supplied streams of tubing, filter material and paper, said forming means causing said filter material to frictionally engage said tube, and to circumferentially envelop the paper stream about juxtaposed streams of filter material and tubing to form a filter rod;
- means for cutting said filter rod into predetermined lengths.
In an apparatus for making a filter rod having a means for forming a traveling stream of fibrous filter material and an enveloping stream of paper into a filter rod, means for placing a length of tubing concentrically within said filter material of said filter rod with said filter material being in frictional engagement with the tubing under a circumferentially applied compressive force, said latter means including a mandrel having a passageway for passage of the tubing therethrough and a nozzle concentrically disposed about said mandrel for shaping the fibrous filter material about said mandrel and the tubing passing therethrough said mandrel having a delivery end circumferentially enveloped by said means for forming to cause said frictional engagement.
Dependencies are inferred from the claim text.