CA1092933A - Cigarette filter - Google Patents
Cigarette filterInfo
- Publication number
- CA1092933A CA1092933A CA345,525A CA345525A CA1092933A CA 1092933 A CA1092933 A CA 1092933A CA 345525 A CA345525 A CA 345525A CA 1092933 A CA1092933 A CA 1092933A
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- CA
- Canada
- Prior art keywords
- stream
- tubing
- lengths
- filter
- paper
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Abstract
ABSTRACT OF THE DISCLOSURE
An apparatus and method for making a cigarette filter wherein a continuous stream of hollow tubing is cut into predetermined lengths and sequentially placed into the forward section of the fibrous portion of the filter such that the trailing section away from a tobacco column acts as diffuser for the cigarette smoke exiting therefrom. In the apparatus, means is provided for feeding predetermined lengths of tubing to a fibrous filter portion at a rate which is slower than the rate of movement thereof such that the lengths are spaced apart a distance along the axial lengths of fibrous portion.
An apparatus and method for making a cigarette filter wherein a continuous stream of hollow tubing is cut into predetermined lengths and sequentially placed into the forward section of the fibrous portion of the filter such that the trailing section away from a tobacco column acts as diffuser for the cigarette smoke exiting therefrom. In the apparatus, means is provided for feeding predetermined lengths of tubing to a fibrous filter portion at a rate which is slower than the rate of movement thereof such that the lengths are spaced apart a distance along the axial lengths of fibrous portion.
Description
~0~9;~
This inventlon relates to a cigarette filter. More particularly, this invention relates to a cigarette filter having an axially aligned hollow tube communicating the tobacco column with a smoke diffuser.
Heretofore, various types of filters have been devised for use in cigarettes in order to screen out certain filterable materials which comprisb the tobacco smoke screen. For example, filters made up of fibrous materials, such as a cellulose acetate, have been known for filtering out particulate matter from the smoke generated during smoking.
However, such a filtering medium between a smoker's mouth and the tobacco column of the cigarette generally require an additional drawing or inhaling force on the part of the smoker in order to draw the smoke through the filtering material. As a result, a practical ~imit has heen imposed on the amount of ' particulate matter that can be filtered out by a particular filtering material due to the need to have a pressure drop across a filter that can be tolerated by a smoker without '~`
;~ discomfort.~
In more recent times, attempts have been made to dilute the smoke stream from a cigarette with ventilating air to ~'~
reduce the quantity o~ particulate matter drawn into a smoker's ' mouth for each puff while allowing the taste to pass through.
Some of these attempts have used bypass arrangements by which a greater or lesser proportion of the cigarette smoke can be bypassed around a filter medium and drawn into a smoker's mouth. In some cases, the fil'ters have been'provided with passageways through which a portion of unfiltered smoke can be passed directly to the smoker's mouth, for example, as in U.S.
30 patent 3,860,011. Such passageways have usually been provided :
iiL~)g~3~
directly in the filter material alnd the filter material has been constructed so as to be collapsed manually about the passageway to constrict the size of the passageway and, thus, reduce the proportion of unfiltered smoke passing through to a .smoker, for example, as described in U.S. patents 3,242,925 and 3,270,750.
One of the reasons for utilizing filtexs with bypass passages is that the flow of unfiltered smoke can be drawn through the filter at a greater speed than the filtered flow which passes through the filtered material so that the faster flow can impinge upon the tongue and taste buds of the smoker at a greater impact speed than the normal. This is believed to impart a greater taste to the smoke. However, such direct impingement upon the tongue can be irritating especially during the next-to-last and last puff when the burning tobacco is proximate the filter tip and the smoke is hot.
AccordingIy, it lS an object of the in~ention to provide a filter having a centered smoke bypass passage partially extending the length of the filter and having a diffuser positioned on the smoker's end of the cigarette to disperse the ; unfiltered~smoke prior to being drawn into the smoker's mouth.
It is another object of the invention to provide an apparatus and process for placing a hollow tube in a cellulose acetate filament filter such that the filaments disperse the smoke exlting the tube.
; Briefly, the invention provides a filter for a cigarette which allows a portion of substantially unfiltered but dlspersed smoke to enter a smoker's mouth at high velocity ; ~while diluting the smoke w th drawn-in air in the mouth.
, ~Z9;~3 The filter i5 used in combination with a cigaxette tobacco section and is joined to the tobacco section by a cylinder or outer wrap of tipping paper. The filter is constructed of a preferably rigid tube, a layer of compacted filter material and a cylinder of perforated or inherently porous plugwrap paper. The tube de~ines a smoke passage of constant cross~sectional area throughout having a draw resistance for controlling the amount of unfiltered smoke delivered to a diffuser prior to entry into a smoker's mouth.
The diffuser does little to filter the smoke and acts to disperse the smoke as previously mentioned. The layer of filter material surrounding the tube and forming the diffuser prefer- -ably is continuous filament cellulose acetate. The plugwrap paper is porous like tea bag paper. The tipping paper which connects the filter to the tobacco column is provided with a plurality of perforations, the number and size of which define the quantity of air to be mixed with the filtered smoke and the substantially unfiltered smoke and draw resistance. The draw resistance through the perforations and filter complement the draw resistance of the smoke through the tube and diffuser whereby for a given draw a desired amount of substantially unfil-tered smoke and ventilation air are drawn into the smoker's mouth.
The means for enveloping the fibrous material about the tube feeding mandrel and the forming means can be of known construction, as is con~en~ionally used in forming filter rods of fibrous filter material of solid construction. For example, this means can be in the form of a nozzle having a Venturi-opening and an air supply as described in British Patent - 933,827.
,,~ . .
The tube is continuously dra~n from a supply and is cut into predetermined lengths prior to being advanced to the mandrel. The mandrel is provided with an internal feed for selectively delivering the Cllt lengths of rods to the fibrous material.
These and other objects and advantages of the invention will become more apparent from the following detailed description and appended claims taken in conjunction with the accompanying drawings in which:
Fig. 1 illustrates a schematic view of an apparatus for making the hollow filter rod with diffuser according to the invention;
Fig. 2 illustrates an enlarged partly cross-sectional view of the apparatus of Fig. l;
Fig. 3 illustrates a perspective view of the portion of the mandrel showing the drag working against a length of rod;
Fig. 4 is an elevation view of the rod cutting mechanism;
~ig. 5 illustrates a cross-sectional view of a cigarette having a filter made in accordance with the invention;
Fig. 6 is a cross-section of a cut length of filter showing the hollow tube sections axially aligned and sequentially spaced along the length of the filter rod;
Fig. 7 is a cross-section of an alternate embodiment of the filter;
Fig. 8 is a cross-section of a cigarette length filter of the alternate embodiment joined to a cigarette column; and Fig. 9 is a cross section taken along lines 9-9 of Fig. 1 and showin~ an anvil heat sealing the plugwrap paper.
Referring to Fig. 1, the apparatus 10 for making a hollow cigarette filter with diffuser 11 includes a means 12 for supplying a stream of fibrous filter material 13 such as a cellulose acetate tow and a means such as a supply xeel 14 for supplying a stream of tubing 15, for example, of hollo~ plastic material. The apparatus 10 includes a tube cutting means 16 receiving tubing 15 and severing same into predetermined lengths, a means 17 for shaping the stream of fibrous filter material 13 about the tubing 15 and a rod former 18 of conventional construction for wrapping the streams of filter material and tubing into the filter rod 11.
ReEerring to Figs. 1 and 4, tube cutter 16 is positioned downstream of the supply reel 14 and includes opposed draw rollers 20 and 20', cutting roller 21 having cutting blades 22 and opposed feed rollers 23 and 23', these rollers being t supported by housing 24. Tubing 15 is drawn along passageway 25 by draw rollers 20 and 20' by the frictional engagement ~f peripheries of the rollers against the tubing. Cutting roller which rotates in timed sequence with draw rollers 20 and 20' then sever tubing 15 into short predetermined sections 26.
Cutting roller 21 acts against free wheeling anvil roller 27.
Tubing sections 26 are then forwarded along passageway 25 and into nozzle 32 through connecting rod 19. Connecting rod 19 includes a leaf spring 29 which acts as a drag against short tube sections 26.
Referring to Fig. 2, the means 17 for shaping the stream of filter material 13 about the tubing 15 includes a nozzle 32 which is similar to that described in British patent 933, 827. That is, the nozzle ~2 includes an internal bore 33 of Venturi-shaped configuration, an annular air chamber 34 which receives air from a suitable air supply source (Fig. 1) and surrounds the Venturi-shaped bore 33, and a Venturi-opening 35 ~929;~3 communicating th~ chamber 34, The entrance end of the nozzle bore 33 is sized to receive the stream of filter material 13 with the material in a spread and decrimped manner from the filter material supply 12.
The rod former 18 is constructed with a forming block 36 and a tongue 37 mounted on the topside of the block 36. The block 36 and tongue 37 form a passageway (not ~hown~ into which the connecting rod 28 projects. This latter passageway is siæed to receive the tubing 15 passing through the connecting rod 28 and the fibrous ~ilter material 13. The tongue 37 and the forming block 36 are also tapered internally to form an inwardly tapering surface for the passageway so that the passage-way gradually diminishes in cross-section. In addition, the rod former 18 includes a conveyor 38 having a conveyor belt 39, such as a continuous fabric belt, which is driven by a belt drive wheel 40 over guide rolls 41 through the passageway formed by the block 36 and tongue 37. The belt 39 is usea to move a stream of porous web 42 e.g. plugwrap paper from a suitable supply reel 43 into the passageway via guide rollers 44 as well as to convey the filter material 13 and tubing stream 15. The web 42 is inherently porous for purposes as explained below.
As shown in Fig. 1, the rod former 18 includes a pair of fol~ing sections 46 as are known and heat sealer 48. The folding sections 46 serve to fold the edges of the delivered web 42 towards each other in enveloping relationship to the filter material and the t~ing while heat sealer 48 heats web 42.
Web 42 is impregnated with a thermoplastic material, such as a polyvinyl acetate/polyvinyl chloride copolymer. Upon heating, the copolymer from overlapping web, fuses and upon cooling forms a seam.
As shown in Fig. 3, ~ibrous filter material 13 is being const~icted by the walls of block 36 to the extent that friction is deveioped between tl~ing sections 26 and filter material 13. With a known speed of filter material 13 through block 36, feed rollers ;'3 and ~3' advance tubing sections 26 at a slower rate such that tubing sections 26 are spaced at predetermined intervals along the length of ; filter rod 50 as shown in Fig. 6.
A suitable cutting mechanism utilizing a knife 49 is disposed downstream of the sealer 48, as is known, for cutting the completed filter rod 11 into predetermined lengths 50.
Each length may thereafter be cut into a multiplicity of filters.
eferring to Fig. 1, in operation, a stream of filter material 13 is fed from the supply source 12, is spread out and decrimped in a conventional fashion as is known and delivered into the nozzle 32. In additionj a length of tubing 15 is taken from the supply reel 14 and passed through cutter 16 into the mandrel 19. After the filter material stream 13 is passed into the nozzle 32, the air which is supplied to the nozzle 32 causes th~ material to bloom, for example, as described in U.S. Patent 3,367,447. This allows the fibrous material to be evenly distributed around the tube and to be pushed along the surface of the mandrel 19 into the rod former 18 rather than pulled. Thereafter, as the filter material 13 is passed into the rod former 18 between the folding block 36 and the tongue 37, the fibrous material is gradually reduced circumferentially due to a tapering of the tongue 37 relative to the forming block 36. The filter material 13 is then brought into direct contact with the tu~ing 15, which has been ~92g33 severed into lengths by cutter 16, ~ithin the rod former 18 and is juxtaposed ln enveloping circumferential relationship with the tubing 15. At the ~ame time, the web of paper 42 is guided into the rod former 18 unclerneath the tubing 15 and filter material 13 and folded int:o a genexally U-shape.
Continued travel of the tubing and filter material causes the filter material to be constricted circumferential1y about the tubing 15 and to hold the tube lengths 26 in place at spaced intervals along its axial length.
10~le movement of the fibrous material 13 through the rod former 18 is facilitated by the conveyor belt 37 and the paper web 42 as is known. In addition, the paper web 42 is sub-sequently folded about the constricted filter mat~rial 13 and the engaged tubing 15 with the paper edges sealed together to form a filter rod 11 of continuous length. The filter rod 11 is then severed into predetermined lengths 50 by the knife ~9.
Knife 49 is programmed to sever filter rod 11 midway , , .
~ between the ends of a selected tube section 26. The embodiment :, , .
shown in Fig. 6 prepares filter rod 50 to be severed along the , ~ 20 liner identified by A, B, C, D and E in the cigarette making machine. Thus, six (6) cigarette filters are made from one filter xod 5 and each is joined.to a tobacco column T to form a filter clgarette as shown in Fig. 5.
Referring to Fig. 5, a filter 56 formed from the filter rod 11 includes a hollow cylindrical tube 57 surrounded by an annular layer of compacted filter material 58, a wrapping of perforated mouthpiece paper 59 and an outer wrap of tipping paper 60. The filter 56 is mounted, as is known, by means of the outer wrap of tipping paper 60 on a tobacco column T to form a cigarette. The outer wrap of mouthpiece paper 60 is 3~
provided with a number of circumfe:rential rows of per~orations 61 w~h are located at about the mid-section of the filter 56.
As shown in Fig. 5, the tube 57 is centered on the axis of the filter 56 and forms a passageway 62 from the tobacco column T to difuser 67.
The smoke (see arrows in Fig. 5 for smoke and air path) generated in the burning cigarette cone during the puff upon reaching the ilter 56 travels predominantly through the unencumbered passageway 62 in the tubing 57. Upon reaching diffuser 67, the smoke is scattered somewhat but will not be diluted by the air entering through perforations 61 which has diluted the already much filtered smoke which has traveled the full length as indicated by arrow A. Arrow B shows a larger quantity of smoke entering passageway 62. Even though the quantity of this smoke is reduced when compared to normal filter cigarettes, its substantially unfiltered and undiluted state will have the effect of enhanclng the taste of the cigarette to the smoker.
The other part of the smoker's puff volume brings in air from the surrounding environment via the perforations 61 in the tipping paper, through the plugwrap paper S9 and the filter ;~ material 58 into the smokeris mouth. The air does not mingle with smoke until it is delivered into the smoker's mouth. This enhances the possibility of the smoker getting an increased flavor impression from the delivered smoke stream. In conventional cigarettes utilizing perforated tipping, diluting air and smoke mix within the filter with the delivered smoke stream being prediluted before impinging in the smoker's mouth.
In reference to Figs. 7 and 8, the apparatus and process of this inven~ion may be utilized to produce the article shown.
. -, _ g _ The tubular article of Fig. 7 contains a porous and preferably rigid f.ilter length 70 ~h.ich is placed therein as previously discussed. Filter length 70 may ~e made from cohesed granules . or a foamed resin, such as polypropylene, polyethylene, nylon, or the like. The tubular article of Fig. 7 may be severed along lines A' to E' to produce the filter unit as shown attached to a tobacco colwmn in Fig. 8.
This application is a.division of Canadian applicat.ion Serial No. 272,437, filed February 23, 1977.
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.
This inventlon relates to a cigarette filter. More particularly, this invention relates to a cigarette filter having an axially aligned hollow tube communicating the tobacco column with a smoke diffuser.
Heretofore, various types of filters have been devised for use in cigarettes in order to screen out certain filterable materials which comprisb the tobacco smoke screen. For example, filters made up of fibrous materials, such as a cellulose acetate, have been known for filtering out particulate matter from the smoke generated during smoking.
However, such a filtering medium between a smoker's mouth and the tobacco column of the cigarette generally require an additional drawing or inhaling force on the part of the smoker in order to draw the smoke through the filtering material. As a result, a practical ~imit has heen imposed on the amount of ' particulate matter that can be filtered out by a particular filtering material due to the need to have a pressure drop across a filter that can be tolerated by a smoker without '~`
;~ discomfort.~
In more recent times, attempts have been made to dilute the smoke stream from a cigarette with ventilating air to ~'~
reduce the quantity o~ particulate matter drawn into a smoker's ' mouth for each puff while allowing the taste to pass through.
Some of these attempts have used bypass arrangements by which a greater or lesser proportion of the cigarette smoke can be bypassed around a filter medium and drawn into a smoker's mouth. In some cases, the fil'ters have been'provided with passageways through which a portion of unfiltered smoke can be passed directly to the smoker's mouth, for example, as in U.S.
30 patent 3,860,011. Such passageways have usually been provided :
iiL~)g~3~
directly in the filter material alnd the filter material has been constructed so as to be collapsed manually about the passageway to constrict the size of the passageway and, thus, reduce the proportion of unfiltered smoke passing through to a .smoker, for example, as described in U.S. patents 3,242,925 and 3,270,750.
One of the reasons for utilizing filtexs with bypass passages is that the flow of unfiltered smoke can be drawn through the filter at a greater speed than the filtered flow which passes through the filtered material so that the faster flow can impinge upon the tongue and taste buds of the smoker at a greater impact speed than the normal. This is believed to impart a greater taste to the smoke. However, such direct impingement upon the tongue can be irritating especially during the next-to-last and last puff when the burning tobacco is proximate the filter tip and the smoke is hot.
AccordingIy, it lS an object of the in~ention to provide a filter having a centered smoke bypass passage partially extending the length of the filter and having a diffuser positioned on the smoker's end of the cigarette to disperse the ; unfiltered~smoke prior to being drawn into the smoker's mouth.
It is another object of the invention to provide an apparatus and process for placing a hollow tube in a cellulose acetate filament filter such that the filaments disperse the smoke exlting the tube.
; Briefly, the invention provides a filter for a cigarette which allows a portion of substantially unfiltered but dlspersed smoke to enter a smoker's mouth at high velocity ; ~while diluting the smoke w th drawn-in air in the mouth.
, ~Z9;~3 The filter i5 used in combination with a cigaxette tobacco section and is joined to the tobacco section by a cylinder or outer wrap of tipping paper. The filter is constructed of a preferably rigid tube, a layer of compacted filter material and a cylinder of perforated or inherently porous plugwrap paper. The tube de~ines a smoke passage of constant cross~sectional area throughout having a draw resistance for controlling the amount of unfiltered smoke delivered to a diffuser prior to entry into a smoker's mouth.
The diffuser does little to filter the smoke and acts to disperse the smoke as previously mentioned. The layer of filter material surrounding the tube and forming the diffuser prefer- -ably is continuous filament cellulose acetate. The plugwrap paper is porous like tea bag paper. The tipping paper which connects the filter to the tobacco column is provided with a plurality of perforations, the number and size of which define the quantity of air to be mixed with the filtered smoke and the substantially unfiltered smoke and draw resistance. The draw resistance through the perforations and filter complement the draw resistance of the smoke through the tube and diffuser whereby for a given draw a desired amount of substantially unfil-tered smoke and ventilation air are drawn into the smoker's mouth.
The means for enveloping the fibrous material about the tube feeding mandrel and the forming means can be of known construction, as is con~en~ionally used in forming filter rods of fibrous filter material of solid construction. For example, this means can be in the form of a nozzle having a Venturi-opening and an air supply as described in British Patent - 933,827.
,,~ . .
The tube is continuously dra~n from a supply and is cut into predetermined lengths prior to being advanced to the mandrel. The mandrel is provided with an internal feed for selectively delivering the Cllt lengths of rods to the fibrous material.
These and other objects and advantages of the invention will become more apparent from the following detailed description and appended claims taken in conjunction with the accompanying drawings in which:
Fig. 1 illustrates a schematic view of an apparatus for making the hollow filter rod with diffuser according to the invention;
Fig. 2 illustrates an enlarged partly cross-sectional view of the apparatus of Fig. l;
Fig. 3 illustrates a perspective view of the portion of the mandrel showing the drag working against a length of rod;
Fig. 4 is an elevation view of the rod cutting mechanism;
~ig. 5 illustrates a cross-sectional view of a cigarette having a filter made in accordance with the invention;
Fig. 6 is a cross-section of a cut length of filter showing the hollow tube sections axially aligned and sequentially spaced along the length of the filter rod;
Fig. 7 is a cross-section of an alternate embodiment of the filter;
Fig. 8 is a cross-section of a cigarette length filter of the alternate embodiment joined to a cigarette column; and Fig. 9 is a cross section taken along lines 9-9 of Fig. 1 and showin~ an anvil heat sealing the plugwrap paper.
Referring to Fig. 1, the apparatus 10 for making a hollow cigarette filter with diffuser 11 includes a means 12 for supplying a stream of fibrous filter material 13 such as a cellulose acetate tow and a means such as a supply xeel 14 for supplying a stream of tubing 15, for example, of hollo~ plastic material. The apparatus 10 includes a tube cutting means 16 receiving tubing 15 and severing same into predetermined lengths, a means 17 for shaping the stream of fibrous filter material 13 about the tubing 15 and a rod former 18 of conventional construction for wrapping the streams of filter material and tubing into the filter rod 11.
ReEerring to Figs. 1 and 4, tube cutter 16 is positioned downstream of the supply reel 14 and includes opposed draw rollers 20 and 20', cutting roller 21 having cutting blades 22 and opposed feed rollers 23 and 23', these rollers being t supported by housing 24. Tubing 15 is drawn along passageway 25 by draw rollers 20 and 20' by the frictional engagement ~f peripheries of the rollers against the tubing. Cutting roller which rotates in timed sequence with draw rollers 20 and 20' then sever tubing 15 into short predetermined sections 26.
Cutting roller 21 acts against free wheeling anvil roller 27.
Tubing sections 26 are then forwarded along passageway 25 and into nozzle 32 through connecting rod 19. Connecting rod 19 includes a leaf spring 29 which acts as a drag against short tube sections 26.
Referring to Fig. 2, the means 17 for shaping the stream of filter material 13 about the tubing 15 includes a nozzle 32 which is similar to that described in British patent 933, 827. That is, the nozzle ~2 includes an internal bore 33 of Venturi-shaped configuration, an annular air chamber 34 which receives air from a suitable air supply source (Fig. 1) and surrounds the Venturi-shaped bore 33, and a Venturi-opening 35 ~929;~3 communicating th~ chamber 34, The entrance end of the nozzle bore 33 is sized to receive the stream of filter material 13 with the material in a spread and decrimped manner from the filter material supply 12.
The rod former 18 is constructed with a forming block 36 and a tongue 37 mounted on the topside of the block 36. The block 36 and tongue 37 form a passageway (not ~hown~ into which the connecting rod 28 projects. This latter passageway is siæed to receive the tubing 15 passing through the connecting rod 28 and the fibrous ~ilter material 13. The tongue 37 and the forming block 36 are also tapered internally to form an inwardly tapering surface for the passageway so that the passage-way gradually diminishes in cross-section. In addition, the rod former 18 includes a conveyor 38 having a conveyor belt 39, such as a continuous fabric belt, which is driven by a belt drive wheel 40 over guide rolls 41 through the passageway formed by the block 36 and tongue 37. The belt 39 is usea to move a stream of porous web 42 e.g. plugwrap paper from a suitable supply reel 43 into the passageway via guide rollers 44 as well as to convey the filter material 13 and tubing stream 15. The web 42 is inherently porous for purposes as explained below.
As shown in Fig. 1, the rod former 18 includes a pair of fol~ing sections 46 as are known and heat sealer 48. The folding sections 46 serve to fold the edges of the delivered web 42 towards each other in enveloping relationship to the filter material and the t~ing while heat sealer 48 heats web 42.
Web 42 is impregnated with a thermoplastic material, such as a polyvinyl acetate/polyvinyl chloride copolymer. Upon heating, the copolymer from overlapping web, fuses and upon cooling forms a seam.
As shown in Fig. 3, ~ibrous filter material 13 is being const~icted by the walls of block 36 to the extent that friction is deveioped between tl~ing sections 26 and filter material 13. With a known speed of filter material 13 through block 36, feed rollers ;'3 and ~3' advance tubing sections 26 at a slower rate such that tubing sections 26 are spaced at predetermined intervals along the length of ; filter rod 50 as shown in Fig. 6.
A suitable cutting mechanism utilizing a knife 49 is disposed downstream of the sealer 48, as is known, for cutting the completed filter rod 11 into predetermined lengths 50.
Each length may thereafter be cut into a multiplicity of filters.
eferring to Fig. 1, in operation, a stream of filter material 13 is fed from the supply source 12, is spread out and decrimped in a conventional fashion as is known and delivered into the nozzle 32. In additionj a length of tubing 15 is taken from the supply reel 14 and passed through cutter 16 into the mandrel 19. After the filter material stream 13 is passed into the nozzle 32, the air which is supplied to the nozzle 32 causes th~ material to bloom, for example, as described in U.S. Patent 3,367,447. This allows the fibrous material to be evenly distributed around the tube and to be pushed along the surface of the mandrel 19 into the rod former 18 rather than pulled. Thereafter, as the filter material 13 is passed into the rod former 18 between the folding block 36 and the tongue 37, the fibrous material is gradually reduced circumferentially due to a tapering of the tongue 37 relative to the forming block 36. The filter material 13 is then brought into direct contact with the tu~ing 15, which has been ~92g33 severed into lengths by cutter 16, ~ithin the rod former 18 and is juxtaposed ln enveloping circumferential relationship with the tubing 15. At the ~ame time, the web of paper 42 is guided into the rod former 18 unclerneath the tubing 15 and filter material 13 and folded int:o a genexally U-shape.
Continued travel of the tubing and filter material causes the filter material to be constricted circumferential1y about the tubing 15 and to hold the tube lengths 26 in place at spaced intervals along its axial length.
10~le movement of the fibrous material 13 through the rod former 18 is facilitated by the conveyor belt 37 and the paper web 42 as is known. In addition, the paper web 42 is sub-sequently folded about the constricted filter mat~rial 13 and the engaged tubing 15 with the paper edges sealed together to form a filter rod 11 of continuous length. The filter rod 11 is then severed into predetermined lengths 50 by the knife ~9.
Knife 49 is programmed to sever filter rod 11 midway , , .
~ between the ends of a selected tube section 26. The embodiment :, , .
shown in Fig. 6 prepares filter rod 50 to be severed along the , ~ 20 liner identified by A, B, C, D and E in the cigarette making machine. Thus, six (6) cigarette filters are made from one filter xod 5 and each is joined.to a tobacco column T to form a filter clgarette as shown in Fig. 5.
Referring to Fig. 5, a filter 56 formed from the filter rod 11 includes a hollow cylindrical tube 57 surrounded by an annular layer of compacted filter material 58, a wrapping of perforated mouthpiece paper 59 and an outer wrap of tipping paper 60. The filter 56 is mounted, as is known, by means of the outer wrap of tipping paper 60 on a tobacco column T to form a cigarette. The outer wrap of mouthpiece paper 60 is 3~
provided with a number of circumfe:rential rows of per~orations 61 w~h are located at about the mid-section of the filter 56.
As shown in Fig. 5, the tube 57 is centered on the axis of the filter 56 and forms a passageway 62 from the tobacco column T to difuser 67.
The smoke (see arrows in Fig. 5 for smoke and air path) generated in the burning cigarette cone during the puff upon reaching the ilter 56 travels predominantly through the unencumbered passageway 62 in the tubing 57. Upon reaching diffuser 67, the smoke is scattered somewhat but will not be diluted by the air entering through perforations 61 which has diluted the already much filtered smoke which has traveled the full length as indicated by arrow A. Arrow B shows a larger quantity of smoke entering passageway 62. Even though the quantity of this smoke is reduced when compared to normal filter cigarettes, its substantially unfiltered and undiluted state will have the effect of enhanclng the taste of the cigarette to the smoker.
The other part of the smoker's puff volume brings in air from the surrounding environment via the perforations 61 in the tipping paper, through the plugwrap paper S9 and the filter ;~ material 58 into the smokeris mouth. The air does not mingle with smoke until it is delivered into the smoker's mouth. This enhances the possibility of the smoker getting an increased flavor impression from the delivered smoke stream. In conventional cigarettes utilizing perforated tipping, diluting air and smoke mix within the filter with the delivered smoke stream being prediluted before impinging in the smoker's mouth.
In reference to Figs. 7 and 8, the apparatus and process of this inven~ion may be utilized to produce the article shown.
. -, _ g _ The tubular article of Fig. 7 contains a porous and preferably rigid f.ilter length 70 ~h.ich is placed therein as previously discussed. Filter length 70 may ~e made from cohesed granules . or a foamed resin, such as polypropylene, polyethylene, nylon, or the like. The tubular article of Fig. 7 may be severed along lines A' to E' to produce the filter unit as shown attached to a tobacco colwmn in Fig. 8.
This application is a.division of Canadian applicat.ion Serial No. 272,437, filed February 23, 1977.
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Claims (7)
EXCLUSIVE PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED
AS FOLLOWS:
1. In a method of making a rod for subsequent division into predetermined lengths to be used as a cigarette filter, comprising the steps of:
a. providing a first continuous stream of hollow tubing from a source;
b. providing a second continuous stream of fibrous filter ma-terial from a source;
c. severing said first continuous stream of hollow tubing into predetermined lengths while maintaining said lengths in axial alignment;
d. placing said streams in juxta-position during travel while simultaneously enveloping said second stream of fibrous ma-terial circumferentially about said first stream of tubing;
e. feeding said lengths of hollow tubing into said second stream of fibrous material in axial align-ment therewith at spaced apart intervals;
f. generating a third stream of paper;
g. constricting said second stream about said lengths of hollow tubing to frictionally engage said lengths of hollow tubing for continued travel there-with; and h. circumferentially enveloping said third stream about said juxtaposed and constricted first and second streams during continued travel of said first, second and third streams to form said filter rod.
a. providing a first continuous stream of hollow tubing from a source;
b. providing a second continuous stream of fibrous filter ma-terial from a source;
c. severing said first continuous stream of hollow tubing into predetermined lengths while maintaining said lengths in axial alignment;
d. placing said streams in juxta-position during travel while simultaneously enveloping said second stream of fibrous ma-terial circumferentially about said first stream of tubing;
e. feeding said lengths of hollow tubing into said second stream of fibrous material in axial align-ment therewith at spaced apart intervals;
f. generating a third stream of paper;
g. constricting said second stream about said lengths of hollow tubing to frictionally engage said lengths of hollow tubing for continued travel there-with; and h. circumferentially enveloping said third stream about said juxtaposed and constricted first and second streams during continued travel of said first, second and third streams to form said filter rod.
2. In the method as set forth in claim 1 the steps of folding opposite edges of said paper stream over each other and adhering said edges together after enveloping said paper stream about said juxtaposed streams to form said filter rod.
3. In a method as set forth in claim 2 wherein said second stream is made of cellulose acetate.
4. In a method as set forth in claim 3 wherein the additional step of cutting said filter rod into pre-determined sections is included.
5. In a method as set forth in claim 4 wherein said predetermined sections consist of six cigarette filter lengths.
6. An apparatus for making a rod for sub-sequent division into predetermined lengths to be used as a cigarette filter comprising:
a. first means for supplying a stream of tubing;
b. a cutter receiving and severing said tubing into predetermined lengths;
c. a mandrel defining a passage-way connecting with said cutter and providing passage for said lengths of tubing therethrough;
d. second means for supplying a stream of fibrous material;
e. third means circumferentially enveloping said mandrel for directing said supplied stream of fibrous material circumferentially about said mandrel;
f. fourth means for supplying a stream of paper;
g. means extending downstream of said mandrel and being integral therewith for feed-ing said lengths of tubing into said circumferentially positioned fibrous material in axial alignment therewith and at spaced apart intervals;
h. fourth means for supplying a stream of paper;
i. forming means for receiving said filter material containing said spaced apart lengths of tubing and paper to circumferen-tially envelop the paper stream about said juxtaposed streams of filter material and tubing to form a filter rod;
j. means for cutting said filter rod into predetermined sections.
a. first means for supplying a stream of tubing;
b. a cutter receiving and severing said tubing into predetermined lengths;
c. a mandrel defining a passage-way connecting with said cutter and providing passage for said lengths of tubing therethrough;
d. second means for supplying a stream of fibrous material;
e. third means circumferentially enveloping said mandrel for directing said supplied stream of fibrous material circumferentially about said mandrel;
f. fourth means for supplying a stream of paper;
g. means extending downstream of said mandrel and being integral therewith for feed-ing said lengths of tubing into said circumferentially positioned fibrous material in axial alignment therewith and at spaced apart intervals;
h. fourth means for supplying a stream of paper;
i. forming means for receiving said filter material containing said spaced apart lengths of tubing and paper to circumferen-tially envelop the paper stream about said juxtaposed streams of filter material and tubing to form a filter rod;
j. means for cutting said filter rod into predetermined sections.
7. The apparatus of claim 6 wherein said cutter includes means for forwarding said cut lengths of tubing to said mandrel at a predetermined rate being slower than the rate of flow of said fibrous material through said mandrel whereby said lengths of tubing are fed into said fibrous material at a rate allowing a predetermined distance between said lengths of tubing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA345,525A CA1092933A (en) | 1976-03-01 | 1980-02-12 | Cigarette filter |
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US66248576A | 1976-03-01 | 1976-03-01 | |
| US662,485 | 1976-03-01 | ||
| CA272,437A CA1079150A (en) | 1976-03-01 | 1977-02-23 | Cigarette filter |
| CA345,525A CA1092933A (en) | 1976-03-01 | 1980-02-12 | Cigarette filter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1092933A true CA1092933A (en) | 1981-01-06 |
Family
ID=27164927
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA345,525A Expired CA1092933A (en) | 1976-03-01 | 1980-02-12 | Cigarette filter |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1092933A (en) |
-
1980
- 1980-02-12 CA CA345,525A patent/CA1092933A/en not_active Expired
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |