DE1432624C - Filter rod for multiple cigarette filters and method and device for its manufacture - Google Patents

Description

The invention relates to a filter rod for multiple cigarette filters made of an air-permeable Underlay with a filter effect and one or more additives that enhance the filter effect, which is characterized in that it consists of a continuous strand of the backing material as There is a carrier for the additives, with portions of the strand loaded with the additives alternate with free sections.

The invention also relates to a method for producing such filter rods and a device for carrying out this method.

Filter rods for multiple cigarette filters made of fiber material and additives through which the filter. effect is strengthened are known per se; also methods of making these known embodiments and the associated devices are already known. From the present extensive patent literature, the prior art for the production of filter rods for multiple cigarette filters practically the following procedure remove:

1. Manufacture of a filter stick containing an additional material;

2. Manufacture of a filter stick without additional material; . . -.

3. Cut the filter sticks according to (1 and 2) and put the cut parts together, such that they abut one another in an alternating sequence;

4. Covering the row of filter rods produced according to (3) and cutting into inserts for multiple filters.

Accordingly, the production of filter rods for multiple filters has previously required at least three, mostly but four different devices, two of which are in assembling and wrapping the cut ones Filter spacing and one or two more to make the two types of filter rods according to (1 and 2) were used.

About devices for assembling different individual filter inserts to a multiple filter rod According to the above principle, there is already considerable literature (e.g. British Patents 971491, 903 687, 867 979 and 818 440). Here the production of the filter rods represents from several individual pieces to the precision of the device high demands, which also still with must be combined with a corresponding output.

From our own Swiss patent specification 325 829 is a method for the production of filter bodies known in which solid additives with filtering action in particulate form or as a slurry applied to continuously conveyed webs of fiber material and the coated webs be combined into strands. The coating takes place there continuously, so that none Multiple filter rods received willow. ·

Also mentioned are the German patents ao .360 921 and 845469; they describe devices for the production of mouthpiece cigarettes, but there is no reference to the production ¹ of multiple filter rods.

The German patent specification 708 926 describes a "mouthpiece cigarette machine" in which a running cigarette paper tape besides tobacco still applied finished mouthpiece inserts at intervals will. This results in finished cigarettes, but not with multiple filter rods.

Finally, the German Auslegeschrift 1143 137 discloses a method for producing hollow mouthpiece cigarettes with a filter insert between the hollow mouthpiece and tobacco. Here, too, finished stoppers (30) are placed on strips of paper . 1. ■ · ...

Compared to the prior art mentioned, the object of the invention is to provide a filter rod for multiple cigarette filters that are particularly easy to manufacture, in terms of their effect but is at least equal to the known filter rods of a similar type. This task will solved with the help of the method according to the invention. This particularly simple and convenient manufacturing process, which is carried out on the device according to the invention, not only saves investment and operating costs, it also leads to a reduction in the inevitable scrap. The filter rod according to the invention can be easily incorporated into the cigarette, since it has the various Contains filter zones on a continuous base, in contrast to those multiple - filters obtained by wrapping several separate "filter plugs" together; Besides that the design according to the invention increases the stability of the filter mouthpiece and increases the risk reduced by "secondary air".

Since the method according to the invention and the special design of the filter rod obtained the easiest way to explain it on the basis of the drawing, should first refer to the ones shown there Embodiments of the device according to the invention received.

It shows

F i g. 1 shows a device for carrying out the method according to the invention by applying Zones of additives on a paper web,

F i g. 2 a part of the device according to FIG. 1,

F i g. 3 a somewhat modified device.

F i g. 4 a device for applying the additive zones to a strand of loose yarn,

F i g. 5 the application of such zones. a continuous band of drawn cellulose threads,

F i g. 6 shows a modification of the device according to FIG. 4,

F i g. 7 shows a part of the thread tape from the device according to FIG. 6, shown enlarged,

F i g. 8 shows a further modification of the device according to FIG. 5 or 6,

9 shows part of the device according to FIG. 8 enlarged,

10 shows a modified embodiment,

FIG. 11 shows a modified part of that shown in FIG. 8 device shown,

FIG. 12 again shows a modification of the device according to FIGS. 1 and 5,

13 shows a further modification of this device, ■ ". · ■ -

14 shows, in an enlarged view, part of the device according to FIG. 13, -

15 shows a further modification of part of the device according to FIG. 13, * ■.

F i g. 16 is an enlarged cross-section of a partial view according to FIG. 15,

F i g. 17 a device for filter rod production, which in place of the corresponding device in Fig. 13 can be used

18 shows a further modified embodiment of the device,

19 shows an arrangement which comprises parts of the circuit shown in FIG can replace the device shown, while the

F i g. 20 to 26 to explain the invention Filter rods or the multiple filters that can be produced from them are used.

Fig. 1 shows an apparatus for manufacturing of filter rods for multiple filters, with paper as the carrier material. The Z. B. 200 mm wide paper runs of a roller 1 arranged on a stand 2 to the device for the filter rod production 3, the one Has the usual shape and wherein the paper is added in a known manner and with a Wrapping material is wrapped, which is supplied from a roll 4.

Between the roller 1 and the device part 3 is the device 6 according to the invention for applying zones, in the present case of strips of z. B. a coal slurry onto the paper.

The device 6 comprises an applicator roller 7, a counter-pressure roller 8, a conveyor roller 9, a Stripping roller 10 and a trough 11 which contains the slurry to be applied to the paper. The conveyor roller 9 is partially immersed in the slurry in the wall 11 and touches the applicator roller 7. The stripping roller 10 is arranged so that they the amount of entrained by the roller 9 and controls to be transferred to the application roller 7 slurry. . .

As in particular from FIG. 2, the application roller 7 contains a plurality of longitudinal surfaces 12 which are separated by depressions 12 a. The surfaces 12 can be part of a coaxial with the roller 7 imaginary cylinder jacket. The arc described by them measures z. B. about 15 mm and is separated from the next surface by a recess 12λ 15 mm wide. The GE-

⁵ '' ⁶ ■ ■

Counter-pressure roller 8 presses the paper onto the surfaces 12 is sprayed on. The yarn is on here side on on. Side between the counter-pressure roller 8 and the

An infrared carrier roller 7 of the device 37 adjoins the device 6 and is passed through it. Radiant heater 13 on. The roller 7 of the device 37 carries separate transverse

In operation, paper is taken from roll 1 by wiping the additional material onto the yarns in the for 5 the rotating applicator roller 7 and the counter pressure FIGS. 1, 2 and 3 described manner. To roller 8 peeled off. During the paper between the application of the material, the in Abder move Coated yarns stand through roller 7 and the counterpressure roller 8 under the dryer 38 runs, strips of the slurry are then passed through which, by means of thermal radiation, apply the suspension, from the applicator roller 9 to the io medium for the material supplying the strips Areas 12 was applied. As the axis brings the evaporation. The yarns then get into Roller 7 is arranged transversely to the run of the paper, the device 3 for filter rod production, where they assign the strips boundaries on the vertically collapsed and enveloped and used to create multiple filters Run in the direction of the paper. The strips can be cut.

extend over the full width of the paper and are 15 The arrangement shown in FIG for their part in the present case z. B. 15 mm wide and applying zones of an additional material applied at a distance of 15 mm. on a strand of continuous cellulose acetate

Threads between the device 6 and the device. Such strands can be stretched under tension, for the filter rod production 3 the strands are therefore taken to stretch or contract the strand in an arc-shaped way in the axial direction to stretch or contract the strands. Direction after application of additive material to vaporize sion agent from the slurry. The prevention so that a coated zojie does not get into the dried paper is then brought in the device 3 in relation to an adjacent rod-like shape in the axial direction, with which the device shifts. ν

Roll 4 supplied wrapping material wrapped and 25 The arrangement shown in Fig. 5 includes the to cut into multiple filter pieces 5. a skein wound strand 40, a first

In the modification according to FIG. 3, the paper roller pair 41, a second roller pair 42, one in front of the roller 1 by means of the rollers 17 and 18, the direction to the band formation 43, a spray box 36, it is pressed against the drum 16, over the larger one a roller pair 44 and 45, an applicator part of the surface of the drum 16 is guided, wherein 30 46, an endless roller 7 moved by two rollers 48 applies the strips to the paper. The belt 47, a device 3 for the filter rod generator application device 6, in this case contains a supply and a roll of wrapping material 4.
further feed roller 9 α, while the counter pressure The strand is from the ball 40 through the rollers

roller 8 of the in F i g. The arrangement shown in FIG. 1 is omitted, 41 deducted, which has a smaller circumference their task carried out by the drum 16 35 speed as the rollers 42 rotate so that the will. Through a hood 19 is not shown strand in a known manner between the roller channels hot air supplied. . pair 41 and 42 is stretched forward. After

The paper runs between the roller 17 and the passage of the rollers 42 allows the strand to stand Drum 16 through and then comes to pre-relax, d. i.e., its linear velocity decreases directional part 6. The application roller 7 rotates there 4 ° to approximately the circumferential speed of the first waI-with the same circumferential speed as the pair of drums 41. Then the stretched one happens mel 16 and applies the slurry strand to the paper, the banding device 43, in which in strips on whose. Form of the for F i g. 1 described - air is blown into the strand in a known manner level corresponds. Then the paper moves underneath to make the threads into a ribbon of uniform Hood 19 through it, where hot air is spread on the paper 45 ger width. Blown into a ribbon like this will to dry the strips; the strand then reaches the spray box 36, Roller 18 then runs the paper to device 3, in which a plasticizer for the cellulose acetate where it is enveloped and formed into multiple filter rods 5 threads, e.g. B. Triacetin, is sprayed on and from the is cut. the strand over the roller 44 and between the WaI-

The in the F i g. The arrangement shown in FIG. 4 can be passed through for 5 ° zen 44 and 45. From the roller that is used to manufacture multiple filter rods, the strand arrives at the endless belt 47, which contains fiber material instead of paper. that supports the strand on its way to device 3 In Fig. 4, six reels 35 are supported with loose yarn and prevents its stretching,
shown. The yarn consists of a number of con- The application device 46 corresponds to the device

continuous threads, which over their entire length wind 37 in FIG. 6 and are fertilized above the treadmill or loops arranged at irregular intervals 47. The pressure roller 8 supports the running and are bundled so that they are a band 47 from below. ,
form practically inextensible core of a yarn. The arrangement shown in FIG. 6 is an alternative solution to the one shown in FIG. 5 in which loops are distributed over the surface of the yarn. 60 the strand is not on an endless belt 47 to

Furthermore, in FIG. 4 a spray box 36, one of the devices for producing filter rods Fig. 1 is described corresponding order initiates; in this case contradiction37, a drying device 38, a single, inextensible yarn with the in the tape direction for the production of filter rods 3 and a strand in the form before the application of the Reel with Umhüllungsmatcrial 4 shown. 65 strips connected. The non-stretchable yarns

The yarns are drawn off from the reels 35 guard the elongation of the strand after leaving and guided side by side through the spray box 36, application device. ^i; ^:

in which a softener for the threads of the yarn The slang is also stretched and vorge here

stretches, sanded and plasticized with the needle 83 is slidable in a seal 85 am

sprayed. After leaving the spray box 36, the upper part of the application part 70 is fitted. In the the now ribbon-shaped strand runs between the shafts rotation of the shaft 18, the cams 79 open the

zen 50 and 51. Here, a number, e.g. B. 'support body go up and down. Training

40, inextensible yarn 54 from the reels 5 of the cams 79 and 81 and the entire arrangement

52 come, also between the rollers 50 and is such that the lower end of the needle 83 the 51 is fed in and blocked uniformly over the band nozzle 71, except when the nozzle 71 is in-shaped Strand distributed. F i g. 7 shows an enlarged inside of the strand. Then namely lifts Part of the ribbon-shaped strand, the threads of which the needle 83 emerges from the nozzle 71 and

53 are partially on top of each other and evenly due to the additional amount of slurry in the filter material Rials distributed over the belt, which are from the storage container 73 on the line. inextensible yarn 54 are held together. tion 72 flows into the interior of the part 70, from the

The strand with the yarns 54 will emerge around the roller nozzle 71 into the strand (e.g. at intervals 51 guided him to a heated roller 55 of 30 mm). , similar shape as the application roller 7 presses. The 15 after passing the application device 68 is shown in The heated roller 55 has raised surfaces 56, which are provided in a manner known per se by the device 69 are grooved, and the yarns 54 are connected to the threads 53. Adhesive to a raised edge of the remelting, so that the tape is applied wrapping material largely before stretching and then around is protected. the rod-shaped bundled strand

The combined tape arrives while it is still laying in 20 and glued to the longitudinal edge. The continuously

Contact with the roller 51 is in contact with the resulting, covered rod-shaped body

Application roller 7 of an application device 57, which is formed into multiple filter rods 5 by the knife 86

the application device 46 corresponds. From there we cut. "

it of the device for filter rod production 3 pulls - As the wrapping material made of paper

leads. 25 by the aqueous suspending agent in the on the

In the arrangement shown in Fig. 8, the strand to be applied slurry becomes moist, Strand stretched and pre-stretched, used in tape form if necessary (e.g. with Polybracht and sprayed with plasticizer, as for ethylene coated paper as wrapping material. Fig. 5 and 6 described. The rope is then equal. In this case, the longitudinal edges of the wrapper Device for filter rod production 60 are heat-sealed from treatment material, known form. This has a set 61 which spreads the slurry injected into the strand with two tongue pieces 62 and 63, a folding device in it axially and radially, depending on the property 64 and an endless belt 65, the latter shafts the slurry. Will be the slumber the tongue pieces 62 and 63 and injected through the mung at intervals of 30 mm, then can Folding device 64 passes through it and over the belt 35 you set it up so that it is pulled away from the injection drum 66 and the rollers 67. Between, put away axially in both directions for about the second tongue piece 63 and the folding device spreads 7 mm. Then there are ab-64 in the filter sticks are a reciprocating application device alternating about the same length of additional and to-68 and an application device 69 for adhesive lap-free sections is present, orderly. The strand and wrapping material 40 instead of the up and down described above of the roll 4 are grasped by the belt 65 and an existing application device 68 can be a device shown in FIG. 10 passed through the device 60. The strand is applied while rotating applicator 86 is shown he is located under the tongue pieces 62 and 63 det that a number at the same angle about moved further, brought into rod-shaped form and distributed a common axis, star-shaped by partially wrapped in the wrapping device. 45 of the axis, which is also the axis of rotation, outgoing

As can be seen from FIG. 9, the back and forth injection devices 87 contain. Any injection related Application device 68 from FIG. 8 a device 87 consists of a hollow body 89 with tubular part 70 with a nozzle 71 at the un- * a nozzle 90 at the outer end. A needle 91, similar End and a connecting piece 72, which extends beyond the flexible height of the needle 83 in FIG. 9, through the body The same supply line 72a with a storage container 73 50 89 to the nozzle 90. The end remote from the nozzle 90 connected is. The device part 70 can press the needle 91 against a fixed cam an opening 74 in a fixed guide 75 ken 88 on the axis of rotation of the applicator and move down, the latter at 61 of the unification86. ', ^, .. j;. ^ ·,;. · ^ / ·'; direction 60 is arranged. The part 70 carries a rotating applicator 86 is above circular flange 76 and a coil spring 77, the 55 of the exposed part of the strand between the presses against the top of the guide body 75. second tongue piece 63 and the folding device 64 At its end remote from the nozzle 71 carries the arranged, and its axis of rotation extends to the Part 70 a cam follower 78 which is normal to two first vertical planes in which the longitudinal cam 79 abuts, the axis on a transverse axis 80 of the rod-shaped bundled strand are arranged, which latter with which the roller 66 is located 60. The device 86 is rotated such that Benden devices is engaged. The roller the peripheral speed of the nozzles 90 equal to the 66 drives the belt 65. The shaft 80 carries between the strand's linear speed. The; ab-; the cam 79 a second cam 81, which was against the axis above the device 60 so geeine pushes cam follower 82, which selects at the upper end that one nozzle in each case into the strand Needle 83 is arranged, which extends axially the part 70 65 when it reaches the lowest point in its rotation penetrates up to its nozzle 71. The needle has reached 83. . is urged upward by a spring 84 so that, due to the shape of the cams, the nozzle 90 is the the cam follower 82 abuts the cam 81. Injector 87 through needle 9t "always

. 209 638/27

closed except when nozzle 90 is on the strand. Then it is open and leaves additional items Filter material which is supplied to the hollow body 89 from a common storage container 73 will flow into the strand via the nozzle 90. . ■,

As shown in Fig. 11, instead of the and from the outgoing application device 68 or the rotating application device 86 also a stationary, Application device 93 arranged in the mouth of the first tongue piece 62 is provided being.

The stationary application device 93 comprises a hollow body 95 with a nozzle 96 which is inserted into the first tongue piece 62 is directed. A needle in the hollow body can open and close the nozzle 96. The needle is reciprocated in the hollow body by a cam which, as shown in Fig. 13, is driven by the device 97. This in turn is controlled by a sprocket on the Roller 67 driven so that the reciprocating movement of the needle is a function of the linear speed of the treadmill 65 and therefore the strand and "wrapping material" on their Way through the device is. A line 98 leads from the hollow body 95 to a pressurized one Storage container (not shown) for the filter material to be introduced into the strand.

The strand labeled 99 in FIG. 11 is close the nozzle 96 has already been partially summarized. The needle moves back out of the nozzle 96 for a short time and allows filter material to flow into the dew, e.g. B. at intervals of 30 mm. The material spreads in the strand that is completely rod-shaped Structure is summarized and enveloped, star-shaped and axially. By selecting the filter material, usually a slurry, one can achieve that substantially equal length of material containing and material-free sections occur in the rod-shaped combined strand.

In the arrangements of Figures 8, 9, 10 and 11, the amounts of material injected into the strand can be controlled by selecting the pressure in the injector, the viscosity, the slurry or suspension, and the dimensions of the nozzles and needles . ■ '·.: ■■ -

In the three device variants according to FIGS. 8, 9, 10 and 11, the effect of the cutting device is in the device for producing the filter insert, synchronized with the injection effect the job setup. The point in time at which the cutting device cuts is coordinated with the time of injection and depends on the length of the continuous rod-shaped structure between the application and the cutting device. - '' "Γ

Fig. 12 shows another arrangement for applying strips of additional filter material to a strand of crimped, continuous filaments of cellulose acetate. The strand from the ball 40 is pre-stretched and shaped into a ribbon, as in FIG. 5, 6 and 8. The "band-shaped strand is pulled between the roller pair 100 and 101 whose peripheral speed is approximately equal to the linear speed of the device to the filter rod making. For a not covered by the rod portion of the surfaces of the rollers 100 and 101 press wicks 102, whose length in the direction of The wicks are fed via the lines 103 with a substance which causes the threads to stick together quickly. This substance can be a solution of a polymeric substance in a volatile solvent, e.g. or a plasticizer such as triacetin;

The polymer solution is released through the wicks 102 onto the rollers 100 and 101 and from there transferred to the top and bottom of the strand.

The strand soaked with the adhesive is passed through a heating device 104 , as a result of which the threads stick to one another. In this form, the rope is practically no longer extensible when the tensile forces that occur in the subsequent process stages act on it.

After leaving the heating device 104 , the strand passes an application device 105, which corresponds to the application devices 36 and 37 described in FIGS. 1 and 4.

The strand coated with strips of additional film material passes from the application device 105 to a drying device 106, in which the suspending agent is driven off, and further to the device for filter insert manufacture 3, in which it is combined, wrapped and cut into multiple filter rods 5.

Example 1 explains the method according to FIG. 12.

Example I.

A rod of crimped endless filaments of cellulose acetate was used. The individual filaments had a denier of 8 and the strand prior to crimping a total denier of 60 000. The extrudate was brought in a tape form by passing led him between the roller pairs 41 and 42 and the means for producing the tape-shaped 43rd A 5% aqueous solution of sodium carboxymethyl cellulose was applied to the tape by wicks 102 and rollers 100 and 101. The tape was then heated in heater 104 and strips of carbon slurry about 15 mm wide were then placed on the tape at intervals The slurry consisted of a 0.9% solution of low viscosity carboxymethyl cellulose and 27 percent by weight carbon dispersed in it. The tape was then dried in dryer 106 , combined in rod form, wrapped and made into 90 mm long six-fold pieces of double filter rods 5 cut.

Each sextuple was 90 mm long and 24.9 mm in circumference. At a pass-through speed of air through the filter of 17.5 ml / sec, the pressure drop was 24 ml of water.

The devices and embodiments of the method according to the invention can also be used when the additional filter material is itself a liquid. '

Embodiments of the device according to the invention will now be described in which the filter material to be applied to the tape, strand or yarn without the addition of liquid applied ". In the embodiments described below, the material can be mixed applied with a resin.

I 432

13 shows an arrangement in which a strand withdrawn from a ball 40 is stretched and pre-stretched, brought into tape form and sprayed with plasticizer. The strand, which has been made into a strip, then moves between a roller 110 and an applicator drum 111 . The roller 110 is arranged on the side of the drum 111 closer to the ball 40 , another roller 112 opposite on the other side of the drum 111. The drum 111 rotates in the clockwise direction at a peripheral speed which is equal to the linear speed of the device for Filter insert manufacture 3 is.

As can be seen more clearly from FIG. 14, the drum 111 has a number of depressions 113 in the axial direction and webs 114 in between. A funnel 115 , which extends over the entire axial length of the depressions 113, is arranged above the drum 111. The mouth of a vibrating filling device 116 is located above the funnel 115 and another vibrating funnel 117 is located above the filling device 116. A scraper 118 contacts the drum 111 between the funnel 115 and the roller 110.

The funnel 117 contains a homogeneous mixture of additional material with a filter effect on the tobacco smoke (in the example activated carbon) and a resin in finely divided form (in the example cellulose acetate). The activated carbon preferably has a particle size of at least 0.18 mm and the cellulose acetate particles a particle size of 0.08 mm. The mixture contains 75 percent by weight activated carbon and 25 percent by weight cellulose acetate. ·

The mixture falls from the funnel 117 onto the vibrating filling device 116 and from there at a certain speed into the funnel 115. Part of the mixture from the funnel 115 fills the depressions 113 when the drum 111 rotates . The scraper 118 removes the mixture located on the webs 114 to the ends of the drum 11 . If a depression 113 comes close to the roller 110, it is covered by the band-shaped strand, and as the roller 110 continues to rotate against the roller 112 , the mixture falls from the depressions 113 under the action of gravity on the strand. The mixture is applied before the strand reaches roller 112. The strand then moves on between roller 112 and drum 111 and from there to device 3 for producing filter rods, where it is combined, wrapped and cut into multiple filter inserts 5. The drum 111 rotates continuously so that the depressions 113 are continuously emptied and filled. The dimensions of the recesses 113 and the webs 114 in the direction of rotation of the drum correspond to the desired length of the material-bearing and material-free sections of the filter rod and can, for. B. each be 15 mm. The amount of the mixture applied to the strand per strip is determined not only by the depth of the depressions 113 but also by their length, which is usually equal to or slightly less than the bandwidth of the strand. For example, 0.080 g of mixture can be applied in one strip.

The threads of the skein are in the establishment 3 and combine as a result of the plasticizer present at randomly distributed Points. Likewise, thanks to the plasticizer, the cellulose acetate particles combine in the mixture among each other and are bound to the coal particles, and the mixture as a whole becomes an.die Threads tied. The multiple filter rods 5 are allowed to harden. , -,.

It was found that the adsorptive capacity of the coal particles for components of tobacco smoke by the presence of the plasticizer and the resin that attach the particles to the filter material binds, is not significantly impaired. It appears that the particulate cellulose acetate resin is the Protect coal particles from being deactivated by the triacetin.

15 and 16 show another variant of the device for applying the mixture.

A drum with depressions 120 corresponding to drum 111 is arranged below a funnel 121 which corresponds to funnel 115. The lower part of the drum 120 contacts a second drum 122, which also has recesses. Both drums are of the same diameter. The drum ' 122 has depressions 123 , the circular arcs of which are larger than in the case of the depressions in the drum 120, but their number is the same in both drums. The depressions in the drum 122 are delimited by very narrow webs 124 , ie, recesses 125 are formed between adjacent webs 124. In practice, the length of the circular arc described by the depressions 123 together with the delimiting webs 124 corresponds to the width of the strips to which the additional material is to be applied.

A casing 126 that holds the mixture in the wells 1 13 contacts the surface of drum 120 between the hopper 121 and a line near the contact line of the drums 120 and 122 120 on the left side of the drum on this page, the wells 113 filled during operation.

A roller 127 guides the strand against the drum 122 near the line of contact of the drum 120 and 122. ',.

In operation, the recesses 113 of the drum 120 are filled under the funnel 121 during passage. The mixture in the depressions 113 only reaches the depressions 123 in the drum 122 and is therefore applied to the strand in the manner described for FIG.

Whereas in the embodiment described for FIGS. 13 and 14, a dissolved resin with plasticizer is used, an embodiment will now be described (according to FIG. 17) in which a thermoplastic Resin, e.g. B. polyethylene is used.

The device shown in FIG. 17 takes the place of the device for producing the filter rod 3 in FIG. 13.-.-- Λ.:; ,.: ■:.; ■ -..-, .- ;. ■:. ',;. ■ ·:,.-.-, -

A continuous strand of cellulose acetate threads is drawn off from the ball 40 (FIG. 13), stretched and pre-stretched, shaped into a tape, sprayed with a plasticizer for cellulose acetate, whereupon filter material is applied in strips. In this case the filter material is a homogeneous mixture of activated carbon and polyethylene. The size of the carbon particles is up to 0.18 mm and that of the polyethylene particles up to 0.05 mm. ·:

The tape or the strand 130 then migrates according to FIG. 17 through the forming head 131 with a funnel-like inlet 132, whereby the tape in rods

is brought into shape. The funnel-shaped opening merges into a tubular passage which a porous conveyor belt 138 pulls the strand. The conveyor belt is cleaned in a cleaner 139. Via the line 134 from a storage container, not shown, supplied under pressure Steam flows over chamber 135 and then through conduits 136 and conveyor belt 138 in the strand 130 a. The warmth of the steam causes the polyethylene to melt, causing itself the mixture of carbon and resin particles binds to itself and to the threads. That from the mold head 131 emerging filter rods are cut into multiple filters by a rotating knife 137.

If necessary, the continuous rod-shaped structure emerging from the forming head 131 can also be passed through a similar forming head in which cold air is blown onto the strand in order to harden the bonds produced by melting and loosening more quickly before the emerging filter rod is cut.
If necessary, the filter inserts emerging in the form of continuous rods from the forming head 131 or the mentioned cooling forming head can also be provided with a cover in a conventional device for producing filter rods. In this case, the rod-shaped structures preferably have a larger cross-section than provided for the finished, covered filter rods 5. So z. B. the steam-treated rod-shaped structure initially have a diameter of 15 mm and is then further compressed in the device for filter insert manufacture so that it has a diameter of 8 mm after wrapping.

Resins other than polyethylene or cellulose acetate can also be used, e.g. B. polyester resins, Polymethyl methacrylate and polyvinyl acetate.

'Paper can also be used in place of a strand or ribbon of thread or a yarn. In the arrangement shown in FIG. 18, a paper web is unwound from a roll 1, and strips of adhesive are applied ¹ to this by an application device 140 (identical to 37 in FIG. 6).

The paper web provided with adhesive strips arrives at a device which is identical to that of FIGS. 13, 15 or 16 and which applies a homogeneous mixture of activated carbon and a thermoplastic resin, such as polyethylene, to the adhesive strips. The heat from the heat radiator 141 located at a suitable distance from the drum 111 melts the resin and binds the particles of the mixture to one another and to the paper. The coated paper web then arrives at the device 3, where it is combined, wrapped and cut into multiple filter inserts 5.
- This method of working requires little glue, as the activated carbon is also bound to the paper by the resin. If the charcoal is only glued to the paper with a normal adhesive, then the larger amount of glue required damages the adsorption effect of the charcoal or other substances. .

Fig. 19 shows an arrangement that the applicator 105 and the heating device 106 from FIG. 12 can partially replace. The one from the ball The strand withdrawn is pre-stretched as usual and broken into tape form, followed by a plasticizer for the threads, ζ. B. triacetin for cellulose acetate threads is applied. After exposure to the plasticizer is heated for homogenization and then the strand in the form of a ribbon between the rollers 145 and the drum 146 carried out, which rotate at a peripheral speed that the linear speed in the device 3

ίο corresponds. '.

The drum 146 is a hollow cylinder (147) with slot-like openings 148, the length of which in axial Direction is somewhat smaller than the width of the band-shaped rope 149 in FIG. 19. The openings 148 can e.g. B. have a slot width of 15 mm and be arranged at a distance of 15 mm, so "that strips 15 mm wide and spaced 15 mm apart are obtained on strand 149. A line 150 with an outlet 151 is arranged in the interior of the cylinder 147. The outlet 151 touches the inner surface of the cylinder 147, in each case the part of the inner surface, its outer surface is covered by the band-shaped strand 149 during operation. *.

Furthermore, there is another line 152 in the drum with an outlet 155, which is against the Inner surface of the cylinder 147 is directed below the outlet 151 of the conduit 150.

A suspension of activated charcoal in air, optionally with the addition of cellulose acetate powder, is fed under pressure to line 150 and is passed through outlet 151 and slots 148, when these are opposite the outlet 151, inflated onto the threads of the ribbon-shaped strand.

As the belt continues to move over the clockwise rotating drum 146 The slot and carbon strip on strand 149 then pass to outlet 153 of the conduit 152, in which steam flows under pressure. The steam flows through outlet 153 onto the part of the Strand located over slot 148. Due to the steam, the threads of the plasticized Strands quickly connected and the coal particles held on it. The strand with the adhering coal particles is then combined in the device 3 (see Fig. 12), enveloped and closed Multiple filter rods 5 cut up. ■ ■ ■; ■■> '■'.

20 to 27 show finished filter inserts in longitudinal section. In Fig. 20, the hatched Parts 170 of the filter stick the coated portions and the unhatched parts 171 the free zones.

The dashed lines 172 indicate where cuts must be made in order to obtain quadruple lengths of dual filter cartridges. ':, · ■■ The quadruple-length 172-172 of an apparatus for producing filter cigarettes are fed, in which they are cut along the line 173, so that two lengths of double Doppelfiltercinsätzen 174 (.. S Figure 21) are formed. These are brought together at their two ends with tobacco-containing sleeve pieces 175 and with these by a common envelope 176 (see Fig. 21)

connected. '

Then a final cut is made along line 177 so that you have two double-filter cigarettes receives. ·. .

_r , The Dqppelfilter of these cigarettes have ansclilie- .renden sections, 244 and 243> ^ t / different

JJend to the tobacco one yon "additional; filter additives A- and J5 _; exists .; ήο'Λ 'uih ' --ώ '■ Αϊ' / νφ? .Ά &'

material, free, section 178, thereafter; Fig. 24; shows part of a: changing invention

. a, section 179 with additional filter material according to; _{Doppeffiltereinsatzesuimit:} alternating ·

and: at the end of the mouth. a section 180 which _; with _; 5 sections 246 and 245 and the additions £ _; and Ö,

the sections; J.78 and j ?? forms a whole and n-, the filter element; naph./Fig, 23 _i; becomes> along i) the

is free of additional filter material. Lines 240 cut into separate filter sticks,

In the described sequence of the one section at each end with the Zu-Schneidevorgängeti no cuts through ZuS. γι- sentence B and ^ between a middle section with the

Set material containing parts of the filter rod 10 have addition Λ. '.

be made, which is advantageous when the filter sleeve according to Fig. 24 is along the

set exerts abrasive effects, whereby the cutting lines cut 241, one number

knives could be blunted. Filter sleeves are provided with sections at the ends

Should z. B. a double filter 174 of 15 mm length the addition C and between a middle section

are produced, the sections 170 have 15 with the suffix D.

and 171 of the continuous film shown in Fig. 20 from the continuous filter rods

stick a length of 7.5 mm each. The ab- F i g. 23 and 24 cut filter cartridges

Sections 178 and 180 in FIG. 24 then each alternate on a device for production

half the length of section 171, and the length of double filter rods of known shape

of section 179 corresponds to the length of the ab- so and wrapped together, with a continuous

Cut 170 through which no cut was made. rod-shaped structure is created, part of which is in

If, on the other hand, cutting through the coated FIG. 25 is shown. Sections 170 along the lines 242 are not avoided, so cuts can be made, with fourfold lengths of fourfold filters, the cuts are made as follows: Sticks are produced which are fed to a device for cutting through the filter stick (according to FIG. 20) 35 position of filter cigarettes will. This along the lines 181, so that six-fold lengths are obtained along the line 247 through each four-fold length of double filter sleeves 5. To build up a quadruple filter rod, one cut, for example filter cigarettes, is then made two further cuts that are two double lengths of quadruple filter sleeves along the lines 182, with three double lengths. These are created with the ends of double filters juxtaposed. These can be inserted between two tobacco-containing sleeves 222 and 223 (see FIG. 26), with which they form cigads (see FIG. 22). Then a final cut is made to remove the rescue with a multiple filter mouthpiece connected along line 184 (FIG. 22), so that one should. , Two double filter cigarettes obtained in which the Double lengths of the quad filters are subsequently joined by the double filter to the tobacco part 183 a 35 a sheath 224, and finally along portion 185 with additional filter material and the line 225 zernach to two quad filter cigarettes outside a section 186 includes, where the cut.

The end of the mouth of the filter represents and free of to- The quadruple filter contains consecutively, from

Sentences is. . tobacco-containing main part, one the material

The inventive method is also used to rial 40 D portion containing a material C Preparation of triple and multiple filters Toggle containing portion (both in the part 226) and wendbär, whereupon during application of a comparable material B and the material A decided additional substances with filtering or retaining section, both in section 235 regarding different effects on tobacco smoke, taken into account,
must be men. 45 An advantage of the FIG. 23 and 26

Also on the sections of the web or the refined process and products is in the

Skein or yarn that was previously considered to be free of additional options, triple or multiple filters with different

Similar material has been described, it is possible to create certain sections that contain substances

if necessary, a material can be applied that are incompatible with one another or when

; has any effect on tobacco smoke. 50 application of different conditions (tetripe

Instead of activated carbon, an additive with temperature, moisture, etc.) may be required.

Filter or other effect on tobacco smoke also '; · ..,. ■■■■,' · '■ -. ^: >> ■: ■ - ■. ^J. \. ^; ^ ---

other substances, e.g. B. Liquid polyethylene glycol Example 2

or fuller's earth can be used. For a triple filter manufactured according to the in

If necessary, a multiple filter with three 55 F i g. 23 and 24 illustrated procedures are as follows

or more different sections can be produced. Example:.

the, which consists of two separate, axially one on top of the other- The in F i g. 24 shown continuous fiitefdri-

lined up filter cartridges, both of which may have been made from embossed paper. the

have different sections in which sections 245 contained (D) alkaline substances, the

different filter and other effects on the 60 remove the acidic components of tobacco smoke «

Tobacco smoke. and sections 246 contained (C) Äkttvkohie-

Such multiple filters are then desired, for example, particulate. The filter insert shown in FIG

when adding material to a web, a strand was made from cellulose acetate threads,

or a thread is applied, of which one triple filter cigarette < made after the

used as the mouth end of the filter undesirable 65 Fig. 23 to 26, therefore shows a tobacco-dependent

Effects are to be expected. Main section 222 or 223 on, -ah "den

23 shows part of a triple filter according to the invention connected; this contains a first

manufactured double filter insert, which is made of ältern - part 226 made of embossed paper with a first Ab-

cut that the alkaline substances, and a second section that contains the coal particles and with a second part 235 made of cellulose acetate threads, which does not carry any additional filter material, and the end of the mouth of the filter. - '··

When the alkaline substances and the coal particles

are compatible with one another, the former can be used over the entire length of the part 226, i.e. over the the entire length of the continuous insert shown in FIG Coal particles can only be found in special sections, e.g. B. in sections 245 are located.

: In addition 4 sheets of drawings

Claims (11)

Patent claims: 1. Filter rod for multiple cigarette filters off an air-permeable base with a filter effect and one or more the filter effect reinforcing additives, characterized in that it consists of a continuous There is a strand of backing material as a carrier for the additives, with the additives loaded sections of the strand alternate with free sections. 2. A method for producing filter rods according to claim 1, wherein solid additives in Particle form or as a suspension in a liquid medium on continuously conveyed tracks made of air-permeable material with a filter effect and the coated webs closed Strands are combined, characterized in that the additives are in the form of individual transverse strips on the running web, the coated continuous structure .zum summarizes this strand and this Lengthwise in sections made of continuous filter material with alternately coated and uncoated sections divided. 3. The method according to claim 2, characterized in that the filter effect is reinforcing Additive a mixture of small particles of a substance with a smoke-filtering effect and finely divided thermoplastic resin is used. 4. The method according to claim 3, characterized in that the resin particles according to applying the mixture by the action of heat, possibly with the help of steam, melts. 5. The method according to claim 2, characterized in that the filter effect is used as reinforcing Additive a suspension of small particles of a substance with smoke-filtering Applies effect in a resin solution and the solvent evaporates. 6. Variant of the method according to claim 2, wherein the additive enhancing the filter effect is introduced into the carrier material, which is at least partially combined to form a strand, characterized in that a suspension of the additive in a carrier medium, e.g. B. a resin solution, injected with the aid of nozzles into the sections of the strand to be coated. 7. Apparatus for performing the method for producing filter rods according to a of claims 2 to 5, characterized by an application roller (7 or 24) for applying the Addition to the web with raised, spaced apart surfaces (12 or 29), the shape of which corresponds to the shape of the strips of additives to be applied (Figs. 2 and 5). 8. Device for performing the method according to one of claims 2 to 5, characterized by a drum (111) with axially extending recesses (113), the shape of which the Shape of the strips of additives corresponds, as well as facilities (115,116, 117 and 118) for Feed the additives into the cavity of the drum (Figures 16 and 17). - 9. Device for carrying out the process rens according to one of claims 2 to 5, gekenn ^ characterized by a hollow cylinder (147) for Applying the additives to the web or strand of thread with slots (148) in the cylinder wall, whose shape corresponds to the shape of the strips of additives to be applied, as well as a conduit (150) having an outlet (151) through which the additives suspended in a gas inflated through the slots (148) onto the web or strand of thread (Fig. 21). 10. The device according to claim 9, characterized by a line (152) with outlet (155) for the supply of a heated gas or steam through slots (148). on the train or the Strand of threads after the strips of additives have been sprayed on (Fig. 21). 11. Device for performing the method according to claim 6, characterized by an injection device (91 or 83) for spraying the additives into separate zones of the Pad combined to form a strand (FIGS. 11 and 13).