US2936764A - Cigarette filter - Google Patents

Description

May 17, 1960 s. VAN TuYL.

CIGARETTE FILTER 2 Sheets-Sheet 1 Filed June 6, 1956 INVENTOR S/DNEY l/HA/ T12/YL ATT NEY BY mvv May 17, 1960 s. VAN TuYl. 2,936,764

CIGARETTE FILTER Filed June 6, 1956 2 sheets-*sheet z INVENTOR .S/DA/EY WW 75K/ TTORNEY "A further 'objectof my United States Patenty 2,936,164 CIGARErrE FILTERL l Y Sidney Tuyl, Fort Pierce, Fla. `Application June 619`56, serial N6'. 589,604r

s claims. (cl. 131-208) My invention relates 'to an improved cigarette lter vand lto a method of making the same and more particularly to a cigarette lter which provides ltering action while permitting smoke to be drawn through the lter with ease, and to aV method for making the filter.

Many attempts have been vmade inthe prior art to provide a cigarettelter which effectively lters cigarette lsmoke toremove la substantial amount of the tobacco tars and nicotine from smoke being inhaled. These .lters ofthe prior art are formed of wads of fibrous material or from rolls of paper and other like materials. Where the filters of the prior art are sufiici'ently dense to give effective ltering action, they do not permit smoke .to be drawn easily through'the lter. For this reason,

cigarettes provided with dense lters dor not give a satisfactory smoke. Where the lters of the prior art are lter which gives effective ltering action while permitting smoke to be drawn through the lter with relative ease. f v

Another-.object of invention is to provide a cigarette filter which gives'eiective filtering action while being inexpensive to manufacture. y Y Y ,Y

vention is to provide a method of making my cigarette lter.

Other and further objects of my invention will appear from the following description.

In general my invention contemplates the provision of av cigarette lter including a pair of paper strips formed with sharp creases extending in a direction at an angle to the strip axes. Owing to the nature of the paper I employ, the sharpcreases break and displace bers along the crease edges, thus causing them to extend into the passages formed by the paper rolled upon itself. I place the strips of a pair one on the other with the creases of the respective strips relatively angularly disposed. The lter is formed by rolling the superposed strips to form a cylinder having a plurality of generally axially extending tortuous smoke passages into which the upstanding bers extend. Smoke being drawn through the passages is ltered by the bers upstanding from` the creases to collect a large percentage of tobacco tars and nicotine contained in the cigarette smoke. In the accompanying drawings which formpart of 2,936,764 laltented May 1'?, 969

ice

junction therewith and in which like reference numerals y mylter. f

vFigure 2 is a plan View of one strip of a pair of paper Vstrips of which my ltery is formed.

Figure 3 is a plan view of the other strip of a pair Yof strips of which my lter is formed.

. Figure 4 is a plan view of a pair of superposed strips of which my filter vis formed.

Figure 5 is av sectional view of the strip shown in Figure 2 taken along the line 5-5 and drawn on an enlarged scale.

Figure 6 is a perspective view of my lter.

Figure` 7 is a fragmentary perspective view of a pair of'fltery forming strips in superposed relationship showing'the path of smoke through Vmy lter.

,. `Figure 8 is a schematic view of one-form of apparatus on ,which my lter may be constructed.

` More. particularly referring now to Figures 1 to 7 of the drawings, my lter, indicated generally by the reference character 10, may be assembled in a cigarette 12 f, `infan'y convenient manner known to the art. For ex- .constructed to permit easy drawing, the ltering action` ample, the lter may be encased in the paper jacket 14 of the cigarette. As can be seen by reference to Figure 2, my lter includes a first paper strip 16 formed with a plurality of sharp creases 18. These creases 18 extend atan angle A to the minor axis of the strip 16 which may betaken along'the line x-x in Figure 2. As can vbeseen by reference to Figure 3, my lter includes a second paper strip 20 formed with a plurality of sharp creases 22 making an angle B with the minor axis of Y the paper' strip 20, -which may be taken along the line y--y of Figure 3. I form strips 16 and 20 from a paper having a nature such that bers Y24 of the paper are broken or displaced so as to stand out from the edges of the creases 1S and 22. The paper of which ystrips 16 and 20 are formed is any paper which releases pulp or lint bers from its bond when the paper is sharply creased. As will be explained hereinafter, the fibers 24 perform the actual ltering action of my filter. v @Referring now to Figures 4 and 7, in the next step lof forming my'iilter. I superpose the strip 16 on the strip 20 with thevcreases 18 relatively angularly disposed with respect to theV creases 22. While the angles A and Bmaybe any convenient angles, preferably I make these angles 45. With the strips 16 and 20.superposed, a

"plurality of diamond-shaped traps or' pockets, indicated generally by the reference character 26, are formed.y

When cigarette smoke is drawn through my lter in the direction of the axes x-x and y-y of the strips, smoke passes through a succession of traps 26 along tortuous paths, one of which is indicated kby the arrows in Figure 7. A great number of bers 24 extend into each of the traps or pockets 26 inthe path of smoke traveling through a pocket.

The smokeis effectively ltered by these bers 24 as it travels from one'pocket 26 to a succeeding the instant specification and which are to Vbe read in oon-L A pocket. Inthe course ofthe passage of smoke between the paper strips 16 and 20 as shown in Figure 7, the fibers 24 adsorb and absorb .a substantial amount of the tobacco tars and nicotine in the smoke. ciated that the paths provided by a succession of traps 26 permit smoke to be drawn through the lter with relative ease. At the same time, bers 2'4 effectively filter the smoke.

In the nal steps of making my filters, I cut the superposed strips 16 and 20 to the proper length and roll up Vthe cut, superposed strips to form the filter. In its nal conguration, the filter appears as is shown in Figure 6.

Referring now to Figure 8, I have shown one form It will be appre- Y of apparatus on which my lters-may be made. The strips 28 and 30 of a pair of lter-forming strips, of the type paper described hereinabove, pass through the vnips .of respective pairs of lluted rollers' v32 .and .34 and 36 and 3S. Rollers 32 and 34 have v'fluted surfaces which mesh Yto crease Ystrip ,28 to' provide it with creases, Isuch as the creases 1S, which make an angle A with a transverse axis of the strip. .The pair of rollers `36 `and 38 are fluted and mesh to provide. strip 30 with creases similar to the creases 22, whichy make an angle Buwith a transverse axis of strip 30. Any convenient drive means .known to the artmay be employed to drive the uted rollers in the directions of .the arrowsin Figure 8.

After emerging from the pairskof rollers .32, 34, 36 .and 38, 4the creased strips 23 .and 30 are fed to a pair of rollers 4? and 42 which bring the strips 'together in superposed relationship `on a table 44. As the superposed strips advance across table 44, .a knife 46, reciprocated in .a housing 48 by any convenient means, such as .a

the art to form lters which may :be assembled in cigarettes.

In use or" my filter .10 it is assembled with a cigarette 12 with the strip axes x--x and y-yY extending in the :direction of the cigarette axis. Smoke being drawn from the cigarette through the lter travels along the tortuous paths, one of which is indicated in Figure 7, through successive traps or pockets 26. As the smoke travels from pocket to pocket, bers 24 upstanding from the edges .of creases IS and 22 collect a relatively large percentage .of the .tobacco tars and nicotine present in the smoke. While providing this effective filtering action, my filter permits the smoke to pass readily through the lter.y

In orderto make my filter, I rst form a pair of strips of paper with sharp creases extending in a direction at an angle to the strip axes. After having creased the strips, I assemble them in superposed relationship with their creases relatively angularly disposed. I cut the vstrips to length and roll them to form finished filters which may be assembled into cigarettes.

While I have shown and described my lter as including yonly two strips 16 and 20 of paper, it is to be under- It will be seen that I have accomplished the objects of my invention. l vhave provided a cigarette -lter which provides effective ltering action while permitting smoke to Ibe drawn through the filter with relative ease. I have provided a method for making my filter. My lter is A relatively inexpensive to manufacture.

l. A lter for ycigarettes including in combination a' rst strip of paper` formed with sharp creases providing channels extending vin a direction at an acute angle to Vthe transverse axis of the strip and ridges separating Vsaid channels and a second'str'ip -of paper formed with sharp creases providing channels extending in a direction at an acute angle to the vtransverse axis ofthe Asecond strip and ridges separating said channels, said strips being superposed with ridges of one strip contacting ridges of the other strip and with the channels of the respective strips extending in diverging directions to form a plurality of connected vfilter pockets providing vlabyrinth paths for smoke drawn through fthe `filter, the channels of each -of said strips extending in a direction making an `acute angle with the longitudinal axis of `the ilter. Y

2. A filter as in claim 1 in which said creases provide edges and including a plurality of fibers extending outwardly from said crease edges.

3. A yfilter as in claim l in which said paper Areadily releases fibers from the paperY bond when creased.

4. A iilter asin claim 1 in which said rst strip creases and said second strip creases extend at rangles of with respect to the strip axis.

5. A filter as in claim 1 in which the creases of the respective strips are disposed at right angles with respect to each other. n

l References Cited Iin the le of this patent UNITED STATES PATENTS o 2,325,386 Frank July 27, 1943 FOREIGN .PATENTS 177,423 Austria Jan. 25, 1954 437,599 Great vBritain Oct. 28, ,1935 574,422 Germany r Apr. 12, 1,933 745,245 Great Britain4 Feb. 22, 1956

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