DE2032360A1 - Smoke filters, in particular for tobacco products - Google Patents

Description

R.J. Reynolds Tobacco

Company ·

Winston Salem,

North Carolina.-NJ- / USA , June 30, 1970

Smoke filters, in particular for tobacco products

The invention relates to a smoke filter working with an impact effect, softer at the downstream end of a tobacco rod is attachable.

Cigarette filters of the known type have certain disadvantages as a result of their design: (a) The filter consists of a plurality of components; (b) the assembly of the various components is difficult, cumbersome, expensive and tedious; (c) the filter performance when removing solid and / or liquid particles from the smoke is impaired; (d) the filter has an adverse effect on the taste and aroma of tobacco smoke and (e) with filters of the known type it is not possible to prevent the particles withdrawn from the smoke from escaping downstream lying end of the filter to be discharged.

In contrast, the present invention is intended to provide an improved Filters, in particular for cigarettes, are created which do not have the aforementioned disadvantages.

According to the invention, a smoke filter was created, which on the downstream lying end of a tobacco rod can be fastened. The filter has a first smoke channel through which the smoke from the tobacco rods can be passed. One thin, perforated membrane lies in a plane parallel to the longitudinal axis of tobacco technology and includes a variety of high speed sdUsen through which the smoke is passed when he the first smoke channel substantially perpendicular to the axis of the

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Filters leaves. A second smoke channel is opposite the first ! Diving channel arranged separated by the membrane and client for recording of the smoke that passed through the high-speed nozzles and hits a wall of the second smoke channel. ■.

An advantage of the improved filter is that it is made using methods known in the cigarette industry a minimum of components can be produced. The components are manufactured at the point in time at which the filter is assembled in order to get by without large storage brackets for the components. ·

"Embodiments of the present invention are based on the accompanying drawings.

1 of the drawings is an enlarged partial side view of one embodiment of the improved filter, shown from! bearings of the same in a longitudinal sectional view;

Fig. 2 is an enlarged plan view of complementary sections; which form components of the filter shown in Figure 1;

FIG. 3 is an enlarged plan view of the illustrated in FIG. 1 partially perforated membrane;

Figure 4 is a side view of one embodiment of one Apparatus used to make the complementary sections shown in Figure 2 of the drawings;

. Fig. 5 is an enlarged partial perspective view of the insertion end that shown in Figure 4 of the drawings Device;

Fig. 6 is an enlarged partial perspective view of the finished body before the complementary portions therein are cut off. The body is discharged from the outlet end of the device shown in Figure 4 of the drawings;

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Pig 7 is a partial perspective view of another embodiment of a device for the simultaneous! production of two Bodies similar to those in Pig. 6 of the drawings comparable, but shown in the reverse position;

Pig. Figure 8 is a sectional view taken on line 8-8 in Pig »7j

Pig, Fig. 9 is an enlarged longitudinal partial sectional view of a further embodiment Embodiment of the improved filter;

Pig. 10 is a perspective view of the support surface of a complementary Body according to Pig. 9 of the drawings. The supporting surface is equipped with an elongated recess forming the second smoke channel;

Pig. Fig. 11 is a view similar to Pig x 9 and is shown another embodiment of the improved filter;

Pig * 12 is an enlarged sectional view taken from line 12-12 in FIG Pig. 11;

Pig. 15 is one of the pig. 9 comparable view of another Embodiment of the improved filter;

Pig. 14 is an enlarged sectional view taken on line 14-14 in FIG . 13; '

Pig. Figure 15 is a sectional view taken on line 15-15 of Pig. 13;

Pig. 16 is one of the pig. 9 a comparable view of a further embodiment of the improved filter;

Pig. 17 is an enlarged sectional view taken on line 1-7-17 in FIG Pig. 16;

Pig. 18 is a view from line 18-18 at Pig. 16;

Pig. 19 is a pig. 9 comparable view of another Implementation of the improved filter;

ORIGiNAL INSPECTED

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Pig. Fig. 20 is an enlarged sectional view taken from line ^ u - ^ ö in Fig. 19 $ ■

21 is a sectional view from line 21-21 in Figure 19 · ₀

22 is a view comparable to FIG. 9 of another Embodiment of the improved filter $ and

Figs. 23 are sectional views from the lines 23-23 and 24-24 in FIG ⁿ _ffl 22 of the drawings "

In Fig. 1 of the drawings, an embodiment of an improved filter 10 is shown "The filter 10 is attached to one end 11a of the tobacco rod 11" The filter is formed by a pair of complementary portions 12 and 13 _t which both · are made of rauchundurchlässigem material, so ZCB '"of foamed plastic material (for example expanded polystyrene)" Each section 12 or 13 is semi-cylindrical of glsioher _D form, "therefore, when the sections are joined together ,, have / in cross section a shape which matches the end 11a of the tobacco rod is",

In the smooth surface 12a or 13a of each section 12 or ₀ · 13 is an elongate notch 14 formed "Each of the notches is closed at one end 14a. A part 14b of the notch 14 formed in the surface 13a is raised near the closed end 14a; that is, the depth of the notch on part 14b is less than the depth in the remaining area of the notch »

The smooth surfaces 12a and 13a of the sections are in close contact with one another after assembly, but are separated from one another by a thin, perforated membrane 15 ( _{FIGS. 0} 1 and 3 of the drawings). The membrane may consist of a strip of thin paper ,, of film or of a plastic film made and has a thickness of about 0.0076 to _Q9 254 mm to _o In the illustrated in Fig _o 3 of the drawings is a diaphragm 15 at the center in A longitudinally extending row of perforations or openings 16 is provided. This opening is round and has a diameter of

_ 5 ".

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about 0.203 to 0.305 mm. The chosen diameter depends on the number of orifices used to determine the initial pressure differential in the filter to about 50.8 mn water column (3.73 mm Hg column) to keep. More than one row of openings can also be arranged in the membrane.

When the sections are mated, the open end 14c lies a notch 14 upstream and stands with the end 11a of the tobacco rod in connection, while the open end 14c of the other notch 14 is directed downstream (Pig. 1). the Notch 14 of section 12 cooperates with membrane 15 and forms a narrow, elongated channel 17 with it which the smoke initially flows through when it reaches the end 11a of the tobacco rod 11 leaves.

The notch 14 in section 13 acts in the same way with the Membrane 15 together and forms a narrow, elongated channel 18, through which the smoke passes after passing through a predetermined number of openings 16 in the membrane passed therethrough is. The number of openings through which the smoke flows from duct 17 into duct 18 depends on the extent of the overlap the closed end portions of the notch and the size of the openings in the membrane,.

Because of the small size of the openings 16, which for example have a diameter of 0.254 mm, and because of the limited Number of openings, which with the channels 17 and 18 in connection stand, the smoke flows out of the openings 16 at a very high speed, for example at a speed of 12 to 61 m / sec. The smoke carried through the openings in hindsight impinges on the adjacent end portion 14b of the notch 14 in the complementary Section 13, as a result of which solid and / or liquid particles contained in the smoke settle on said end part 14b, before the smoke begins its flow through the remaining area of the Channel 18 continues. The distance between the end part 14 "b> the so-called baffle, and the openings 16 in the membrane carries about 0.203 to 2.54 mm

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The membrane 15 is normally glued to both flat surfaces 12a and 13a attached »The joined 'sections 12 and 13 and the membrane 15 are attached to the end 11a of the labakstäbehsns attached with the help of a cover 20, which consists of a suitable mouthpiece paper »·

The assembly of the sections 12 and 13 with the membrane 15 as the filter is also attached to the end of the tobacco stick of known types of equipment and techniques in the field of cigarette making. The complementary sections 12 and 13 are produced using different types of device. Two embodiments 21 and 22 of the device are shown in FIGS. 4 and 7 of the drawings shown. In both lalls are the complementary sections formed in a continuous manner

The device shown in Figures 3Pign _0, 4 and 5 of the drawings has a feed nozzle 23, τοπ which a continuous stream 24 of a molten elastic mass is emitted and directed towards a first contact between a pair of forming bands 25 and 26 »Bas Band 25 driven by belt pulleys or sprocket wheels 27a and 27b located horizontally in Saar, the belt 26 is held in the same way and rotated by a second pair of horizontally spaced belt pulleys or sprocket wheels 28a and 28b, both sets Pulleys can be driven by a common, not shown drive source »

The corresponding Riemensclieiben 27a ~ 28a and 27b-28b are aligned perpendicular = right above the other * "The tape 25 has several Patrisen = reduced hurry or 3? © JO rms at ₉ which bathroom © to end © aligned and rotatably connected to each other s-Indl ₈ The tape was guided around the outer circumference of the pulleys 27a and 27a. ._ can. Each mold 30 lsi SSIT a fitted outwardly facing planar surface 30a ₈ is _a © on which is in elongated projection 31st The Yorspruag 11 i © * shaped so that it the.-Linker-. Exercise 14 in the desired configuration MXfi © t ₀

The belt 26 can be rotated or pivoted in the same way with several interconnected male die parts or molds 32 are provided. The outer surface 32a of each mold 32 is formed with a elongated, semi-cylindrically shaped recess 32b provided Shape of. Recess 32h determines the rounded outer surface of section 12 or 13.

As can be seen from FIGS. 4 and 5 of the drawings, belts 25 and 26 move in a linear, horizontal direction during a certain portion A of movement, with the corresponding shapes on their belts in abutment with one another. In this way, the two shapes form the desired overall shape for accommodating the flow of plastic. When the corresponding molds move through section A, parts of the flat surface 30a of the mold 30 are in sealing contact with corresponding areas of the flat surface 32a of the mold 32. following en, the molded parts forming the bands can be moved end to end sealingly into abutment, so that leakage of the injected plastic mass is prevented during its expansion, namely while the molded parts move as an overall shape through segment A of the web.

As can be seen from Fig. 5 of the drawings, the molten Stream 24 of plastic compound from the feed nozzle 23 into the recess 32b of the mold 32 designed as a die is introduced before the mold 32 rests or comes into contact with the mold designed as a patrix Form 30 arrives. When the female mold part with the melted Plastic compound has been filled, it moves in alignment with the corresponding male mold part or the mold 30, whereupon the two shapes are positioned horizontally as a unit between a pair of vertically aligned, elongated pressure plates 33 and 34 move. The pressure plates hold the corresponding resp. complementary molded parts in an aligned, sealed position, if they move through section A of the web. The printing plates prevent the molded parts from expanding during expansion of the plastic mass separate from each other. It is advisable to have an excess of melted

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Plastic aces within the formed by the corresponding molded parts Bring overall shape, so that all details in the area of the recess or notch in the finished, molded product 35 (Fig. 6) are formed. When the closed form. Parts moving along section A of the web cure occurs (full expansion) and cooling of the injected plastic mass take place before the elongated product 35 on the downstream lying end D of section A is discharged «, Am downstream lying end D, the belts separate and move about their respective pulleys 27b or 28b.

The finished, discharged product 35 is shown in FIG. 6 of the drawings from a continuous, semi-cylindrical shaped rod * With a flat surface in which several, identical notches 14 are formed. The notches 14 extend there- · at a uniform distance from one another in the longitudinal direction of the rod. The rod-shaped product 35 is then guided past a suitable cutting device (in FIG. 6 of the drawings only the cutting plane C-C shown); With the aid of the cutting device, individual or multiple, complementary sections 12 or 13 of suitable dimensions separated from each other.;:

The speed of the molded parts in section A of the web is in accordance with the injected plastic mass and as a function of the hardening and cooling properties of the plastic mass ) performed. A cooling device can also be placed near the section A can be used to increase the speed of the belts in section A of the web.

Although the device 21 has only been shown using a pair of ribbons 25 and 26, additional Pairs of ^ 'tapes are used to make both, complementary Manufacture sections 12 and 13 at the same time. With such an arrangement, the additional straps can be placed side by side with the Bands 25 and 26 are arranged. The sprockets or pulleys required to drive the additional belts can be connected to the corresponding axes for the chain sprockets or ■

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Pulleys 27a-b and 28a-b are keyed.

In the further developed device 22 shown in FIGS. 7 and 8 of the drawings, two complementary, elongate and rod-shaped bodies 35 and 35 'are formed at the same time. The complementary sections 12 and 13 of the filter are manufactured in a manner which will be described in detail. The device 22 has a pair of longitudinally spaced nozzles 36 and 37 through which streams of molten plasticine mass are introduced in order to produce the corresponding rod-shaped bodies 35 and 35 '. A pair of endless belts 38 and 40 cooperate with the nozzles 36 and 37. The band 38 is formed from a wide, strip-shaped material, which during successive sections E and P (I ¹ Ig. 7) can be transformed in a sequence, first into an elongated, channel-shaped body and then into a tubular body. The belt 38 is supported and driven by a pair of longitudinally spaced apart pulleys 41a and 41b. Belt 40 is likewise supported and driven by a second pair of longitudinally spaced apart pulleys 42a and 42b.

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ΙΟ 2 Ω ^? "3 fi Π

The pulleys 41a "and 42a are located in senErecnter Fugitive to each other while the pulley 42b fluid * downward of the pulley 41b and with respect to it in an increased manner Position is arranged as can be seen from Pig. 7 of the drawings results. Before the belt 38 between the pulleys 41a and 42a is passed through, the longitudinal edges of the same are bent upwards by means of a suitable device in order to to form a substantially U "shaped channel. On the tape channel a stream of molten plastic mass is applied from the nozzle 36. The lower part of the channel-shaped band 38 corresponds at this point essentially to the outer surface or outer configuration of the complementary section 13. The band 4o consists of a thin, strip-shaped material, which

Ψ has projections or molded parts 43 located axially in alignment on one side and spaced apart in the longitudinal direction. The moldings 43 are designed to form notches 14 in the rod-shaped body 35 at the downstream end of the device. At the. Opposite surface of the band 4o are a plurality of axially aligned and longitudinally spaced projections or shaped parts 44 (FIG. 8) which form the desired notches in the rod-shaped body 35 '. The molded parts 43 can be offset somewhat in the longitudinal direction with respect to the molded parts 44. The extent of this offset depends on the desired offset between channels 17 and 18 of the in

) Fig. 1 shown filter 1 from.

When the stream of plastic mass has deposited on the belt channel which was formed in front of the pulley 42a, a portion of the tape 4o is placed over the flow of plastic and between the upwardly extending edges of the tape 38 ο The band 4o and the molded parts carried by it cooperate with the lower part of the "band channel" while they are move as a unit through section E of the path »You form" 'in this way the overall shape or the mold cavity for the rod-shaped body 35 "at the downstream end of section E of the path becomes a second. Stream of molten plastic mash from nozzle 37 onto the exposed (upper) Area of the band 4o abandoned. The band 4o is located

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while between the upwardly turned longitudinal edges of the band 38. After the second stream of plastic mass has been applied to the belt 4o, the two belts move through as a unit section F of the railway. As the tapes pass through section F of the web, they pass through one stationary forming unit 45, which forms the band 38 into a cylindrical body or a tube T, as can be seen from FIG. 8 of the drawings. The tube T surrounds the two streams of Plastic mass, which are separated from one another by the wrapped band 4o. After the belt 38 has its tubular shape has taken move the two ligaments and the recorded one Plastic flows as a unit through the remaining area of section F of the web, after which the plastic mass is cured and cooled.

At the downstream end of the forming unit 45, the tubular belt 38 is returned to its flat configuration by suitable guide bodies, not shown, before the belt reaches the pulley 41b. As the body 35 released from the belt 38 and the belt 3o7u5n move the circumference of the pulley 41b, the body 35 has a tendency to bend slightly downward, releasing the body 35 ^{from the} underside of the belt 4o.

Slightly downstream from pulley 41b and in front of the Pulley 42b pulls the belt off the underside of the Body 35 ', after which the latter ar-f one side of the pulley 42b distracted from this and thus comes free from it. The band 4o is then returned to a position in which

she
rather / moves around the circumference of pulley 42b.

When the two bodies 35 and 35 'have been detached from the straps 38 and 4o, they are placed in a forming device (not shown) passed where the perforated membrane 15 in sandwich construction the body is inserted between the adjacent, flat surfaces. When the membrane is properly aligned the whole becomes Unit passed by a cutting device, not shown, in order to cut off filter Io of suitable size therefrom. - 12 -

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Although the complementary section has so far been considered to be continuous Molding processes have been described, they can of course also by other gate directions, for example can be manufactured by injection molding machines and the like.

Referring to Figure 9 of the drawings, there is another embodiment of an improved filter, designated by reference numeral 12o, is shown. The filter 12o is at the downstream end a tobacco rod 121 attached. This embodiment of a filter according to the invention can of course be attached to cigars or in Pipe shafts can be used as for the first embodiment of the present invention applies. "The tobacco stick 121 has a core 122 of compressed fibers of mixed tobacco which: Surrounded by a sheath 123 are. The envelope 123 consists of a conventional, thin and white cigarette paper.

The filter 12o consists of a pair of complementary ones complementary body 124- and 125, which are made of a matching, Smoke-impermeable material are made, so from foamed plastic mass. The bodies 124 and 125 can be useful Rwei se are manufactured in a continuous casting and molding process.

Body 124 has a substantially semi-cylindrical outer surface laugh and an essentially smooth surface in which an elongated channel 126 is formed. The channel 126 has an upstream open end 126a. The end 126a of the channel is in direct communication with the core 122 of the tobacco rod 121.

The body 125 also has a semi-cylindrical outer surface and a flat surface in which an elongated Channel 127 is formed. The channel 127 is provided with an underside 128 that is stepwise offset. The two bodies 124 and 125 form a cylinder when assembled, the diameter of which is essentially the same as the diameter of the tobacco ■ Rod corresponds to which they are attached. A he

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the raised portion 128a of the stepped bottom 128 is provided near the upstream end of the body. An elongated strip 129 made of absorbent or absorbent material (for example blotting paper) is placed over the stepwise underside 128 of the channel. In the embodiment shown, the strip has a width which spans a pair of shoulders 13o. The shoulders 13o delimit the side walls of the channel. The tops I3oa of the shoulders are flat and form the support surfaces Mr a thin, perforated membrane 131, which is arranged between the mating surfaces of the complementary bodies 124 and 1-2.5 ". The membrane 131 can be glued to one of the surfaces or to both.

The membrane 131 interacts with the channel 127 and forms the channel-132 through which the smoke is first passed. _ "_. The membrane 131 is also involved

the strip 129 and with the shoulders 13o together and forms a second immersion channel 133. The also channels 132 and 133 are only in communication with one another via the openings 131a, which are located in the membrane 131. Preferably eight or more openings are used to connect the two smoke ducts to one another. Each of the openings is preferred designed round and has a diameter of about 0.254 mm. Therefore, when smoke is drawn through the filter, it occurs in the form of a multitude of highs Velocity guided flows into the smoke channel 133. The streams of smoke collide with the exposed surface of the strip 129, which is located approximately at a distance of 0.381 ram from the adjacent face of the diaphragm 131 is located. The thickness of the strip 129 is approximately 0.508 mm. The part of the strip which rests over the raised portion 128a of the stepped bottom 128 is in direct contact with the Membrane 131 "as can be seen from FIG. 9 of the drawings.

When the smoke streams onto the exposed area of the strip 129 impact, become liquid and / or solid, contained in the smoke Particles deposited on the strip. Because of the suction

and absorption capacities of the strip, the particles are held in the strip and can no longer pass through the downstream Lying end of the smoke channel 133 flow out. In certain cases, a second stage (not shown) is preferred on the underside 128 in the step-wise deformation according to FIG. 1 in a comparable manner, whereby the cross-sectional area of the channel 127 is increased. This has the effect of reducing the speed of the flow through the downstream lying end of led smoke is reduced. There is therefore no need for a conventional, made of fibrous material plug to be placed on the downstream end of a filter. Of the Dispensing with such a plug reduces the cost of the filter and facilitates its assembly.

The previously described parts which make up the filter 12o are covered by an outer cover T of tipping paper in it Location held. The tipping paper also serves to attach the filter to the end of the tobacco rod 121.

In FIGS. 11 and 12 of the drawings is another embodiment of the improved filter, designated by reference numeral 134, is shown. The filter 134 is the same in structure Filter 12o comparable with the exception that a; laminated Strip 135 is provided instead of strip 129. The strip 135 has a first layer 135a made of a perforated, non-absorbent material, which: the impacting Rauohstrom is aligned opposite one another. The one in the first layer 135a provided openings 135b are with respect to of the perforations or openings 131a in the membrane 131. A second larainate body or a second layer 135c made of absorbent and absorbent material is on the first layer 135 and is only connected to the smoke channel 133 via the openings 135b of the first layer. Using of the filter 134, the streams of smoke introduced at high speed initially collide with the parts of the layer 135a, which are located between the openings 135b, which is why the liquid and / or solid particles are deposited thereon.

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When the deposited particles increase in size and have a tendency to move downstream towards the At the end of the smoke channel 133 they will flow in the openings 135b of the sheet captured and absorbed in the receptive sheet 135c. The particles are therefore from the Downstream end of the channel 133 is not discharged or diverted.

In FIGS. 13-15 of the drawings is another embodiment an improved filter shown. In the case of the filter T36, the complementary body corresponds to 124- and the one therein formed channel 126 the complementary body and the channel of the filter 12o and 134 of the design already described. Furthermore the filter 136 has a perforated membrane 131, which is similar in shape to filters 124 and 134. The membrane 131 cooperates with channel 126 and forms a first smoke channel 132.

The filter 126 has a second, complementary body, which consists of a smoke-impermeable material and which has a substantially semi-cylindrical outer configuration like this with reference to the complementary one Body 125 of the filter 12o and 134 has already been described. The surface 137a of the body 137 is provided with an elongated channel 138, as shown in FIG. 15 of the drawings. The channel 138 is in turn with an elongated, in the Centrally arranged rib Ho, which is attached to the upstream upstream and downstream ends 14oa and Lifted raised is arranged. The ends of the ribs support the diaphragm 131. The central part 14oe of the rib 14o (i.e. the part between the raised ends) forms a flattened surface and acts as a baffle for those guided at high speed Eauch currents which through the openings 151a of the membrane step through. The openings shown in dashed lines in Figure 15 of the drawings are in alignment aligned with the central portion 14oc of the rib.

On each side of the rib 14o is a narrow channel , NSPBCTED, 09818/1190

141 "and 142, in which a strip 142 of a recording" or. absorbent material "(Pig. 14). The thickness of each strip 143 approaches the height of the central portion Hoc the Rib 14o. The downstream end lifted the butt also serves as a smoke barrier to deflect the smoke laterally after its impact on the middle part 14oc, whereby it the exposed surface of the strips 143 passes. The strips absorb the liquid and / or solid particles, which from the Smoke are separated and which have the tendency to migrate from the baffle. It is possible this way, a The particles flow away from the downstream end of the Filters to prevent.

The portion 143a of each strip 143 overlies a raised teal at the upstream end of each channel 141 and 142 in holding contact with the perforated membrane 131. The smoke in the filter 136 first flows from the core 122 of the Tobacco sticks through the first smoke channel 132 and from there as a plurality of smoke streams through the openings in the membrane. The smoke streams impinging on the flat top of the central part I4oc of the rib cause the liquid and / or solid particles deposit on it. The smoke is deflected laterally after its impact, so that it is absorbed by the or receptive strips .143. From there it reaches the downstream end of the channels 141 or 142.

In FIGS. 16 through 18 of the drawings is another embodiment of a filter, denoted by reference numeral 144, shown. In this embodiment, the upper complementary body 124 and the perforated membrane 131 correspond to im essentially the corresponding components of the filters 12o, 134 and 136 described. A second, complementary or supplementary one Body 145 made of smoke-impermeable material is "used in the filter 144. This is comparable to the corresponding bodies 125 and 137 with the exception that the area 145a is designed in a different way. The surface 145a, instead of being provided with a channel, is flat.

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forms and has only one centrally located projection 145b, which is located on the upstream End of the face. (Figs. 16 and 18 of the drawings) The top of the protrusion 145b is flat and supports the Membrane 131. On opposite sides of protrusion 145b and longitudinally to surface 145a are strips 146 made of absorbent material. The strips serve a dual purpose: (a) they absorb the liquid and / or solid particles deposited on the portion of the surface formed between the strips 146; and (b) they serve as spacers between the bodies 124 and and therefore keep the central portion of the mating surface 145a a suitable distance from the adjacent surface of the diaphragm 131, for example at a distance of 0.35 mm. If the Body 124 and 145, membrane 131 and strips I46 exactly are joined together a cover T made of tipping paper is applied, which holds the components of the filter 144 in their assembled position and which holds the filter at the end of a labak stick 121 attached, as can be seen from Fig. 16 of the drawings results. A corresponding covering or envelope is used in the filters already described are also used.

Another embodiment of a filter, provided with reference number, is shown in FIGS. 19 and 21 of the drawings. The body 124 and the membrane 131 are formed in the same way as the corresponding components of the filters 12o, 136 and 144. The other, second and complementary section 15o differs from the other bodies or sections already described in the design of the ¹ surface 15oa. The surface is provided with a central channel 15ob which is provided with projections 15oc at the upstream and downstream ends. A laminated strip 151 overlies channel 15ob and protrusions 15oc. It extends essentially over the entire length of the section 15o. The upper layer 151a is not absorbent or non-absorbent and is exposed to the high-speed currents.

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The second layer 151b is made of an absorbent material

and extends with layer 151a. The longitudinal edges of the layers are essentially straight and lie on the lower, opposite ones Surfaces of the shoulders which delimit the side walls of the channel 15ob. The lying over the projections 15oc Parts of the strip 151 hold the membrane 131, while the region of the strip spanning the central part of the channel 15ob is arranged at a certain distance from the adjacent surface of the membrane 131, for example with a Distance of 0.35 mm.

The opposite surfaces forming a side wall of the Shoulders 152, which on the central part of the channel 15ob and on downstream projection 15oc arranged adjacent are with their upper parts opposite the adjacent longitudinal edge of the strip 151 and the downstream edge Protrusion 15oc deepened, while the deeper parts of the Shoulders, which lie against the strip edges, are corrugated or ribbed and form several, small pockets 152a. If the Smoke in the form of individual smoke streams on the surface of the upper * Strike layer 151a, particles contained in the smoke settle on this surface and flow laterally into the pockets and thence into the absorbent sheet 151b to prevent particles contained in the smoke from being drawn from the downstream end the filter can be discharged.

In FIGS. 22 through 24 of the drawings is another embodiment of an improved filter, designated by reference number 15 3, is shown. As in the case of the one already described Filter, the filter 15 3 is also equipped with a pair of complementary bodies 124 and 154. Of the Body 124 is preferably of the same construction and the same configuration as the body 124, which with respect to the filter 12o has been described. In contrast, the body 154 is centered with a pair of spaced apart in the longitudinal direction aligned projections 155a and 155b. Which are attached to opposite ends of the body. The part of the body 154 forms between the projections 155a and 155b a recess 158 according to FIG. 23 of the drawings can be seen.

borrowed that the protrusion 155b is shortened in the transverse direction, so that channels 157a and 157b on both sides of the projection are formed. The smoke is passed through these channels leads after it has hit the part of the receptive strip 129 which is located within the recess 15 6 is located between the protrusions 155a and 155b. The outer edge of each channel 157a and 157b is made up of the outer shell T. Mouthpiece paper that limits the filter at the end of the tobacco stick 121 attached.

In the case of the filter 153, the solid and / or liquid, in the smoke Particles contained in the absorbent strip 129 are absorbed when the smoke is in the form of smoke streams on the strip hits. The smoke can then pass through the channels 157a and 157b are discharged. Since the body 154 has no side walls which delimit the outer edges of the channels 157a and 157b, is the manufacture of the body as well as the assembly the filter components are significantly simplified.

With all filters according to the invention according to FIGS. 9 Up to 2U of the drawings comes a strip of absorbent or absorbent Material for use, This extends essentially with the length of a body »which is adapted to the Surface of another body is applied. This can be done using automated equipment. The filters described in all embodiments are -under Using a minimum of components assembled and eliminating the need to use one made of fibrous material Plugging. The material and production costs of the filters are therefore significantly reduced.

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Claims (1)

R, J. Reynolds Tobacco
Company Winston Salem " North Carolina, NJ / USA June 29, 1970 Claims Smoke filter for attachment to the downstream end of a tobacco rod, characterized in that a ™ first body forms a first channel (17) through which the smoke from the tobacco sticks (11) flows so that a thin, perforated membrane (15) in a plane parallel to the longitudinal axis of the tobacco rod (11) is aligned and has a plurality of high speed orifices (16) through which the smoke leaving the first channel (17) is guided essentially perpendicular to the longitudinal axis, that a second body a second channel (18) which is separated from the first channel by the membrane (15), and that the smoke out exiting the high-speed openings impinges against a wall (40b) of the second channel (18). 2. Smoke filter according to claim 1, characterized in that the membrane (15) sandwiched between the first and the body forming the second channel is inserted. 3. Smoke filter according to claim 1, characterized in that the body forming the first and second channel from one another additional smoke barrier sections (t2,13) are, between their parallel, opposite, flat wall surfaces' (12a, 13a) sandwich the membrane is arranged, and that the wall surfaces each have notches (14) which together with the membrane (15) form the first and the second channel (17,18) «, 109818/1190 4. Smoke filter nach'Anspruch 3, characterized in that the notches (14) within the filter overlap that the first channel (17) with an opening at the upstream lying end of the filter is connected, and that the second channel (18) with an opening in the downstream End of the filter is connected. 5. smoke filter according to claim 1, characterized in that the first and second bodies consist of a pair of elongated, complementary sections (12,13) which are aligned and close ■ to each other axially on the downstream end of the Tobacco rods (11) are aligned so that each of the complementary sections made of a smoke-impermeable material is and each on a surface (12a, 13a) with an elongated, only at one end open notch (14) is provided that an open end of the notch in an upstream portion is directed and ends at the end of the tobacco rod, while the other, open end of the notch of the other section is directed downstream, whereby the ■ closed 's'enen ends of the notches are associated with one another that the thin, perforated membrane (15) sandwiched between the notched surfaces (12a, 12b) of the complementary sections - Is arranged that the notches of the sections with the Membrane (15) interact and first and second elongated channels (17,1-8) form which. only through a predetermined number of openings (16) in the membrane in communication with one another stand, and that the openings are sized so that smoke passes through it at high speed and hits a wall (14b) of the second channel (18) in order to get on it Wall to deposit the solid and liquid particles contained in the smoke. 6. smoke filter according to claim 5, characterized in that each complementary section with a longitudinally extending, is provided substantially flat surface in which the notch is located. 10 3318/1 iS0 7. smoke filter according to claim 5, characterized in that the Filter (10) is essentially cylindrical in shape, and that the cross section of the filter corresponds to the cross section of the rod end (11a) corresponds. 8. A smoke filter according to claim 5 or 6, characterized in that the complementary sections are made of a molded plastic material exist. 9. smoke filter according to claim 5, 6 or 8, characterized in that the complementary sections by a continuous Casting process are manufactured. 10. smoke filter according to claim 3 ₃ 6 or 8, characterized in that each complementary section has a semi-cylindrical shape. 11. smoke filter according to claim 5, characterized in that the Part of the notch, against which the smoke flowing at high speed hits, is less deep than the remaining area of the notch. 12. Smoke filter according to one of the preceding claims, characterized by se- ung "■, 'indicates that the connection / between the channels (17, 18) causing openings in the membrane are circular and have a diameter of about 0.203 to 0.305 mm that the thickness of the membrane is approximately 0.0076 to 0.254 mm, and that the distance between the openings in the membrane and the baffle is about 0.203 to 2.54 mm. 13. smoke filter according to any one of the preceding claims, characterized in that the surface of the second channel, the baffle-forming having a predetermined surface area of an absorptive material, and the material _s is contacted with the run through the second channel smoke in contact so that in the Liquid and / or solid particles contained in smoke are deposited on the absorbent material, _etc. 09818/1190 14. Smoke filter according to claim 13, characterized in that the predetermined surface areas made of absorbent material Impact surface for the high-speed flow of smoke forms. 15. Smoke filter according to claim 13, characterized in that the Surface area made of absorbent material with regard to the impact points the smoke flows on the wall surface is offset. 16. Smoke filter according to claim 13, characterized in that the wall surface is layered and a first, perforated layer consists of a non-absorbent material, against a surface of which the smoke streams are brought to impact, and that a second layer of absorbent material on the opposite surface of the first layer is attached. 17. Smoke filter according to claim 13, characterized in that the openings of the membrane in a longitudinal direction Row are aligned. 18. A smoke filter according to claim 17, characterized in that the wall surface has an elongated, narrow, first strip of a non-absorbent material extending with and in alignment with the series of openings, and that an elongated second strip of absorbent material is arranged close to the first strip, but offset from this. 19. Smoke filter according to claim 13, characterized in that the a pair of bodies forming the first and second ducts 'elongated, essentially semi-cylindrical and complementary Bodies exist that each body has a contact surface, that the ^ nlageflache separated by the perforated membrane are separated that one of the bodies with an elongated, first recess is provided whose upstream The end is open, that the recess and the membrane form the first channel that the second body with a longitudinal 109818/1 lon Lichen, second recess is provided, .whose downstream directed end is open, that the second recess and the perforated membrane form the second channel and that the receptive Material is arranged in the second recess. 20. Smoke filter according to claim 19, characterized in that the second recess essentially over the entire length. ' of the complementary body extends so that the second recess is stepped off, with a raised part on the upstream lying end of the body is provided that a stepwise stepped surface of the second recess elongated strip of absorbent material is provided which extends in the direction of the recess, and that the above the raised, upstream end of the second Part of the strip lying face to face with the recess perforated membrane is arranged. 21. A smoke filter according to claim 19, characterized in that the second recess has a base part and vertical wall parts that the wall parts have curved surfaces that over the base part is an elongated, laminated strip is arranged, which is a first layer of a non-absorbent Material has that the first layer is freely arranged opposite the openings in the membrane · that a second layer an absorbent material is attached to the first ply, and that the second ply over in the substantially vertical, upright wall part formed recesses with the second channel connected is. 22. Smoke filter according to claim 19, characterized in that the The contact surface of the second, complementary body is step-shaped, with a raised part on the upstream lying end comes that over edge parts of the surface a pair of spaced apart, elongated strips are provided from a receptive material, and that the strips are essentially in the direction of the stepped 109818/1 ι QO wise stepped surface and with · the perforated The membrane interactively rest against this in order to create the second channel to build.