TOBACCO CIGARET FILTER PRODUCTION DESCRIPTION OF THE INVENTION This invention pertains to tobacco cigar filters and provides a tobacco cigar filter production method wherein a row of tobacco cigar filtering material is continuously and longitudinally advanced. , the advancing filtration material accumulates towards the bar configuration, the accumulated advance filtration material is shaped to and secured in the form of a bar, and the continuously produced bar resulting from filtering material can be cut into finite lengths, and in where there is discontinuous pneumatic injection of particulate additive (eg, through a cylinder or injector duct, which is preferably stationary) laterally into the advancing accumulation filter material to form separate additive cavities integrated into and longitudinally separated as length of the bar continuously produced. In some embodiments, the separate particulate additive cavities are injected sequentially and pneumatically (eg, through a fixed injector conduit) laterally into the advancing accumulation filtration material to integrate into and separate longitudinally along the continuously produced bar . The apparatus according to the invention for the manufacture of tobacco cigar filters comprises means for continuously advancing a row of tobacco cigar filtration material longitudinally, a device for accumulating the advancing filtration material, a former for filling for configuring and securing the accumulated advance filtration material in the form of a bar, optional cutting means for transversely cutting the bar continuously produced in finite lengths, a pneumatic injector conduit (usually fixed) connectable to means for supplying particulate additive thereto, and pneumatic injection means for discontinuously admitting particulate additive into the injector conduit and moving it therealong, the injector conduit extends laterally of and in the path of the filtration material to discharge transversely from and into the accumulation device. In some embodiments, the pneumatic injection means transports separate cavities of particulate additive from the supply means sequentially along the injector duct (which is usually stationary). The gas used for the injection of pneumatic particle can be vented from the accumulation filtration material. Additionally or in place of some, most or all of the gas used for the injection of pneumatic particle can be vented or withdrawn upstream of the particle injection point. In all cases the momentum or pneumatic momentum or kinetic energy imparted to the particles intended for the formation of the cavity (unlike fine particles and / or other unwanted dust) is sufficient to ensure its trip and injection into the material of accumulation filtration. Thus, it is to be understood that all references herein to "pneumatic transport," "pneumatic injection," "pneumatic transport and injection," and the like apply, where the context permits, not only to cases where any or all the gas passes in the accumulation filtration material along with the particles, but also to those where little or none does so since most or all of it has been vented or extracted upstream. Reducing or preventing the release of pneumatic injection gas in the accumulation filtration material can reduce or prevent the spread or dispersion of injected particles within the material and thus improve the sharpness of the definition and separation of the cavity in the product bar. The passage and injection of the particulate additive transversely of (instead of axially along), and especially radially of, the trajectory of the filtration material allows the reduction or minimization of the time and distance of the pneumatic transport of the additive in the filtration material, and therefore can ensure that the resulting additive cavities are separated and can optimize the accuracy, reliability and controllability of the integrated additive cavities. The transverse injection to, especially radially of, the machine direction can minimize the dispersion of the additive particles longitudinally injected from the rod and thus reduce or eliminate the presence of unwanted lost injected particles between cavities or in (very close) a) the ends of the cut filter lengths. The pneumatic transport of the particulate additive to the injection point is preferably as short as practically possible and is therefore suitable or substantially rectilinear as well.; for example, the path can be as little as 170 mm long, more advantageously 150 mm or less, for filters of conventional size and content as indicated hereinafter. In particularly preferred embodiments the path may be about 135 mm long or even less; the use of an injector conduit to extend from an external particle supply in the accumulator device of course imposes a minimum practical length. The transport and injection side tires of the particulate additive can be substantially radially from (ie, at right angles to) the axis of the advancing accumulation filtration material; in this case the pneumatic transport path of the particulate additive can be through the wall of the device used to effect the accumulation. The transport and injection side tires of the particulate additive could instead be not perpendicular to the axis of the path of the filtration material; when such transport and injection are in the same general direction as the advance of the filtration material, the pneumatic transport path of the particles could then be obliquely through the open upstream mouth of the accumulation device instead of through of your wall. For its sale and subsequent use, the continuously produced initial bar will usually have to be cut into lengths, preferably as part of the continuous process or operation of the apparatus. To ensure the required separation between cuts along the continuously produced bar, and its required general placement (for example, between more than through the integrated cavities of particulate additive such that the cut filter bars have a clean final appearance ), for a cutter it is preferred that it is oriented to the total production of the filtering material (for example, in the mechanical control) and for the injection operation to be synchronized with the cutter - the injector is preferably the slave of the cutter. Within such timing, however, pneumatic transport and injection operations can be adjusted to achieve a more specific required placement of the cavities integrated along the cutter bars - for example toward the centers or ends of the cutting bars . In the filters according to the invention the integrated additive cavities can be completely enclosed in the matrix of the filtration material, and they are compacted but can taper towards one or both ends - for example, they can be of a generally ellipsoidal configuration. In the bar produced initially the integrated additive cavities can even have longitudinal separation. It may be preferred, however, to have other cavity arrangements - for example relatively close longitudinal spacing alternating with longer spacing - it being possible to achieve this by proper adjustment of the timing and pattern of the injections; this can facilitate the provision of occasional simple filters with a simple integrated additive cavity near one end (preferably the tobacco end in a filter cigarette) and far from the end (preferably the buccal end), as explained in FIG. following with reference to Figure 4 of the accompanying drawings. The individual filters according to the invention will usually each have a single integrated particulate additive cavity, but instead could be a plurality of such smaller longitudinally separated cavities in a single filter. A filter according to the invention can be attached end-to-end to a rolled tobacco rod (for example, by annular tipping or a complete tipping overwrap) in a filter cigar according to the invention. Any filter or cigar with filter according to the invention can be ventilated. In this way, if the filter has its own filler envelope, the latter can be made of material inherently permeable to air and / or provided with larger ventilation openings or openings and can be exposed when used with annular grinding in a filter cigarrette. A complete ventilation envelope envelope may also be inherently air permeable or provided with ventilation holes, and in ventilated products where the overwrap and overwrap filter envelope are present ventilation through the overwrap will usually be in register with that through the overwrap. The ventilation holes through the filler casing of the filter, or through a tipping overwrap, or through both simultaneously, can be made by laser drilling during filter or filter cigar production. Where ventilation in a filter or filter cigar according to the invention is located longitudinally of the product, this location is preferably in one or two regions selected from upstream, downstream, and in register with the or a cavity of particulate additive, depending on the performance in ventilation and filtration required; ventilation upstream of and / or in register with a cavity of particulate additive is often preferred. There may be ventilation between cavities when two or more are present. There can be ventilation only in the tobacco bar, only in the filter, or in both. The degree of ventilation can be 50% or less (for example 40 or 30% or less) but is preferably over 50% (eg 60% or 70% or greater) - as measured in the standard manner in the art . The invention allows the efficient manufacture in a single step continuous operation of commercially acceptable composite filters having different particulate and filtering matrix portions. The additive particles employed in the invention can be of any material acceptable to smokers, but will normally be those conventionally used in the production of tobacco cigar filters, including sorbents (eg, selected from activated carbon, silica gel, sepiolite). , alumina, ion exchange material, etc.), pH modifiers (eg, alkaline material such as sodium carbonate, acidic materials), and flavorings. Usually they will be sorbent particles, preferably carbon particles - especially activated carbon granules. Mixtures of different particles can be used. The flavoring, for example menthol, can be carried by the substrate particles (for example, sorbent). The filtration material forming the matrix of the bar into which the additive cavities are integrated can likewise be selected from any of those materials (usually filamentary, fibrous, woven or extruded) conventionally employed for the manufacture of filter for cigar tobacco. Natural or synthetic filamentous tow, for example, of cotton or plastics such as polyethylene or polypropylene, but especially filamentous tow of cellulose acetate, is the preferred filter matrix material, but other conventional materials, for example, natural or Synthetics, cotton, woven material such as paper (usually pleated) and synthetic non-wovens, and extruded material (eg, starch, synthetic foams) can be used additionally or in their place. The configuration and securing of the rod-shaped filter material may involve applying a conventional filler wrapper (which may be permeable or impervious to air) secured by an overlapped seam and glued in the usual manner; Where the filtration material incorporates a heat-activatable adhesive, the application of heat during the formation of the bar can bind the filtration material together to provide a bar that is coherent and dimensionally stable without a filler wrap - although a wrapper Stuffing can still be provided if preferred. The particulate additive is usually kept in a reservoir under pneumatic pressure, which feeds it into a duct or injector cylinder. It is convenient for such duct or injector cylinder to extend through the reservoir; this provides a compact and efficient system and can minimize the pneumatic travel distance and time of the additive through the injector in the accumulation filtration material. In some preferred embodiments the additive particles continuously pass in a pneumatic injector duct to which sequential pulses of carrier gas are supplied for discontinuous injection; in this way the sequential pulses of pressurized carrier gas can carry respective sequential separate cavities of the particular additive laterally in the accumulation filtration material. The size and spacing of the additive cavities integrated in the stick product depend, for a given proportion of total production of filtration material, on the frequency of the pulses and the feed rate of the additive particles (e.g., from a deposit as in the previous) to the conduit. In other embodiments the additive particles are fed discontinuously into a pneumatic injector duct by a valve that moves or changes repeatedly between open and closed positions, and the particulate additive entering the duct while the valve is open moves along the duct by a conveyor gas stream for discontinuous side injections. In this way the particles can be fed from a reservoir or other supply means in an injector conduit through the valve, a high velocity stream (and / or high volume flow rate) of carrier gas is passed continuously through the injector conductor so that when a particulate additive cavity enters while the valve momentarily opens it is transported separately along the injector conduit and injected laterally into the accumulation filtration material. However, although the valve opens only momentarily, a stream of particles can in fact pass continuously through it for a finite period of time while it is open (increase and then decrease if it is progressively opened and closed) and The pneumatic transport and injection velocity can be so high that each particle entering the duct is transferred instantaneously and instantaneously to the accumulating filter material where the cavity formation occurs. In all cases, the pneumatic transport and injection speed, in relation to the slower longitudinal advance of the filtration material, allows the formation of a product bar with compact and well-defined additive cavities separated along its length. The operation of the valve is preferably controlled by a cutter to prevent cutting through the cavities, but precise placement of the cavities along the cutter bars can be achieved by adjusting the synchronized valve operating rate. For a given transport and injection velocity the size of the integrated cavities depends on the feed rate of the additive particles in the conduit (which may in turn depend to a large extent on the size of the open valve inlet) and the time and speed of operation of the valve (which can for example be operated electrically or pneumatically); and the cavity separation depends on the operation time of the valve. As indicated generally above, the pneumatic conveyor gas can be vented from the filtering material before the latter is condensed to a rod shape - for example with the aid of exhaust ports through the wall of the accumulation device . Such a gas may additionally or instead be laterally vented from an injection conduit or cylinder upstream of its particle outlet (and preferably from outside the filtration material or out of an accumulation device), with or without the positive assistance of applied suction; especially when such side ventilation is by vacuum outlet, the rate of gas extraction may be sufficiently high to allow little or nothing of the carrier gas to reach and exit the particle outlet, and therefore to obviate the need for ventilation of the accumulation filtration material; a high volumetric ratio of such a vacuum outlet (eg, greater than the volumetric input ratio) upstream of the particle injection can reduce or prevent the injection of undesirable dust and fine particles of additive into the filtration material of accumulation - while the larger additive particles for the formation of the cavity, rapidly accelerated by the conveyor gas stream at high speeds (eg, 100 to 200 m / sec or greater), continue to and through the injection outlet of particle without undue speed reduction. In all circumstances the transport and injection of pneumatic particle radially of the path of the filtration material has the advantages indicated in the foregoing. However, the above described characteristic of the substantially instantaneous pneumatic transport of successive particles in the filtration material, with the cavity formation occurring only in the filtration material and being completed only after the injection, can also be usefully employed for the injection of discontinuous particle with transport and / or injection of pneumatic particle not perpendicular to (including axially of) the path of the filtration material. Likewise the ventilation or extraction of pneumatic transport gas from upstream of the injection of the particle can also be usefully employed for the injection of discontinuous particle with transport and / or injection of pneumatic particle not perpendicular to (including axially of) the path of material filtration Vacuum removal of such gas upstream of the particle injection, especially at high volumetric output ratio, may be particularly appropriate for the good quality of the product under these circumstances. Accordingly, in another aspect of the invention there is provided a process and machine for making a tobacco cigar filter rod having separate cavities of particulate additive integrated therein and spaced longitudinally therealong, in which one row of filter material for tobacco cigar is continuously and longitudinally advanced, the advance material accumulates towards the rod configuration, pneumatically particulate additive is injected into the advance accumulation material by the use of a conveyor gas stream, and the accumulation material in advance with the injected additive is configured to and maintained in the form of a rod, and wherein the particulate additive is fed discontinuously into the conveyor gas stream by means, for example of a valve that moves or changes repeatedly between open and closed positions, which repeatedly and intermittently feeds the additive continuously, and for At the feeding period the individual particles for injection, immediately or upon entering the conveyor gas stream are transferred substantially and instantaneously consequently into the advancing accumulation filter material where they accumulate to form a corresponding separate integrated cavity; and a further aspect of the invention provides a process and apparatus in which a longitudinally advancing row of the tobacco cigar filter material accumulates towards the rod configuration and is then shaped and secured in the form of a bar, particulate additive is pneumatically injected discontinuously in the accumulation material to form separate additive cavities integrated into and separated along the product rod, and pneumatic injection gas is vented or extracted from upstream of the particle injection point, usually outside the material of accumulation filtration and preferably outside of a device used to effect accumulation. In each of these aspects of the invention, any or all of the other features of the method and apparatus as described in the foregoing and the following (eg, related to the transport and / or injection of additive crosswise in the direction of the machine, use of an injector duct that can be fixed or stationary, details of ventilation and / or extraction of transporter / injection gas, numerical values, additives and suitable filter materials, etc.) can be used unless they are impossible by the broad definition of the aspect. BRIEF DESCRIPTION OF THE DRAWINGS The invention is illustrated, by way of example only, by the following description together with the accompanying drawings, in which similar numbers denote similar matters and in which: FIGURE 1 is a schematic illustration of the relevant parts of a conventional cigar filter bar making machine; FIGURE 2 schematically illustrates the radial injection of particulate additive in the manufacture of the cigar filter rod according to the present invention;
FIGURES 3 (a) and 3 (b) show schematically more detail of an embodiment of injection means for use in accordance with the invention as in Figure 2; and FIGURE 4 schematically illustrates options for the arrangement of the particulate additive cavities in multiple length filter bars made according to the invention. In the conventional system shown in Figure 1, a disseminated tow 2 of plasticized cellulose acetate filaments, which has been subjected to the usual pretreatment steps (not shown), accumulates towards the bar configuration through the funnels. , 28 while advancing the filler 55, which forms continuously in the elongated filter bar 57. The stuffing wrap 52 of a supply roll 50, and the tow 2, are conveyed through the stuffing former 55 into and through a conveyor 54 which also wraps the stuffing wrap 52 around the bar while the bar is formed and it secures it in its place by means of an overlapped and stuck seam. The bar 57 passes from the conveyor 54 by rollers 58, 59 to a cutting device 60 that divides the formed bar into finite lengths 61. The accumulation or condensation means 27, 28 of Figure 1 could be replaced by a single accumulation funnel or the like. Such a single accumulation funnel 4 is shown in Figure 2, where 2 is the supply of the tow as in Figure 1, but the filling former etc. of Figure 1 is omitted for clarity. In Figure 2, the carbon granules 6 of a supply reservoir 8 are discontinuously injected radially into the accumulation tow in the funnel 4 through the injector cylinder 10 by means of an injection mechanism 12 shown in more detail in Figure 3. The carbon granules are pneumatically transported along the injector cylinder 10 and exit the cylinder to form the cavities 14 integrated into and separated along the continuously produced filter rod 57; while the cavities 14 are shown in Figure 2, they could of course be invisible in the bar in practice. The coal supply 16 to the reservoir 8 is maintained under pneumatic supply pressure of the main tank 18. The air pulse generator 74, controlled by the electric motor 34, receives high pressure air from the compressor 22 and rapidly directs pulses of high pressure air in repetition in the injection mechanism 12 at 24 to correspondingly re-open repeatedly. a valve of the mechanism 12, the valve closes between pressure pulses by the constant air pressure that pushes back from 26. In operation, the valve thus oscillates to close and re-open repeatedly very quickly. While the valve momentarily opens at 46 and until it closes shortly thereafter, the carbon granules enter the cylinder 10 of the reservoir 8; the incoming particles are immediately carried out rapidly separately along the cylinder 10 and are injected radially into the accumulation tow by a high velocity flow or conveying air (eg, 100 to 200 or more meters / seconds ) which is continuously passed in cylinder 10 of 20, and virtually instant transport and injection of the inlet granules continue until the valve closes to momentarily stop feeding the granule; the carbon granules are in this way batchwise injected radially into the through tow to form the separate additive cavities 14 in the product filter rod; the total production of tow and the speed and time of pneumatic injection are such that the tow advances only a short distance during each injection, which facilitates the formation of a product bar with well-defined separate granule cavities. The stroke, or opening stroke, of the valve of the injection mechanism 12 is limited by a stop 28 whose position is determined by the cam 30 adjustable by an electric motor 32 controlled by the flow rate controller 76. A cutting device 36 divides the bar 57 continuously produced in finite lengths such as those shown in FIG., these are usually a constant multiple (for example, 2 or 4 or 6 times) of the length of the eventual individual filters. The cutting device 36, by means of the infrared recording cell 38, the encoder 40 and the controller 42 with the user interface 44, is synchronized with the tow feed and controls the synchronized operation of the injection mechanism to ensure cutting only between the integrated cavities and not through a cavity. If the transport air of 20 enters the funnel 4 it can be vented from the filtration material before the latter is completely configured to a bar shape, for example by openings (not shown) through the funnel wall 4. Additionally or in Instead, there may be venting or extraction of carrier gas laterally out of the cylinder 10 between the opening 46 of the valve and the granule injection outlet. In this way the arrow 19 indicates such optional venting or extraction of gas out of the accumulation filtration material and funnel 4.; this could be by means of a port or exit ports (not shown) through the wall of the conduit 10, or through pipe (not shown) connecting the interior of the conduit 10 to a vacuum source; in the latter case, the volumetric vacuum outlet ratio may be sufficiently high (eg, greater than the volumetric input ratio of 20) to remove the desired fine dust and carbon particles but without unduly affecting the injection of the granules further great for the formation of the cavity. The injection device 12 of Figure 2 is shown more clearly in Figures 3 (a) and 3 (b) in which its valve 13, 48 is shown respectively open and closed at 46. Figure 3 (a) shows granules of carbon entering the injector cylinder 10 through the opening in 46 (see also Figure 2) of the valve 13, 48 within the reservoir 8. A high pressure air pulse is shown in 24 acting on the piston 48 of the valve 13 to push it back into the chamber 70 of the pneumatic damper against the pushing pressure back from 26, which momentarily opens the valve at 46, to the extent allowed by the stop 28, to allow the granule inlet Carbon in the cylinder 10 injector. Figure 3 (a) indicates the granules 6 dispersed in a relatively diffuse stream by its rapid pneumatic transport beyond the inlet 46 of the valve. Upon cessation of the high-pressure air pulse at 24, as shown in Figure 3 (b), the pressure that pushes back from 26 again closes the valve with extraction air ventilation at 72 and with the granules of carbon that has been carried further and injected radially into the accumulation tow through the cylinder 10 by the constant supply of conduction air of 20. Figure 3 (b) indicates the few final granules 6 entering the duct 10 immediately before of the complete closure of the valve at 46. It is emphasized that the representation of the granules 6 in the conduit 10 of Figures 3 (a) and 3 (b) is purely schematic. The position of the adjustable stop 28 determines the maximum size of the inlet 46 of the valve, for given operating conditions (reservoir pressure, valve movement speed and time during which the valve is fully open) the size of the cavity of product in this manner is simply adjusted by the adjustment of the stop 28. In the embodiment and modifications thereof described in the foregoing with reference to the drawings, the injector cylinder 10 extends radially of the axis of the filtration material path, but it could instead be not perpendicular to the axis - for example, that extends obliquely through the open upstream mouth of the accumulation device into the accumulation tow. Different patterns of additive cavities integrated into the product bar can be obtained by adjusting the pattern of air pulses at 24 and therefore the pattern of opening and closing of the valve of the injection mechanism. Figure 4 illustrates three possibilities for the location of the additive cavity in the filter rods according to the present invention. The illustrated quadruple length bars supplied for the manufacture of filter cigarettes could normally be divided first along line B to give two bars of double length-each double length bar could then have two tobacco bars attached thereto, one at each end, followed by cutting along line A to produce two filter cigarettes. In option (a) the completely closed cavities 14 separate equally and uniformly along the bar, and in the eventual individual filter in a filter cigarette the cavity 14 could be located centrally. In option (b), the valve of the injection mechanism is operated to give close and wide alternating separation of the successive cavities 14, and the initial cutting of the multiple length bar of the continuously produced product is such that, in the filter cigar product elaborated as described above, the additive cavity of the individual filter is displaced towards the buccal end. Choice (c) is preferred, where the continuously produced bar has the same cavity pattern as for (b), but the initial cut to give the multiple length bar is such that the eventual individual filter has the cavity 14 of particulate additive displaced towards the end of the tobacco and far from the mouth end; this reduces or eliminates the risk of carbon affecting the appearance or taste of the filter cigarette. Preferred filter bars of the invention, as illustrated, have the matrix of filter material free of misplaced injected particles, and the matrix and additive cavities substantially free of dust and fine particles of additive. The representation of the additive cavities in Figure 4 is diagrammatic; in practice each cavity preferably has a more curved surface, which is generally ellipsoidal or configured as a rugby ball. The method and apparatus according to the invention can produce composite additive - which carry size filters, carbon content and conventional yield. The individual product filters may for example be circumferential (for example, approximately 25 mm) and long (for example up to 27 or 25 mm long) conventional and have a conventional carbon content of approximately 15 to 35 mg - or a content of carbon even greater than 60 mg; for longer nozzles, higher carbon content is possible. The filters have a filtration performance similar to that of conventional dual filters of the same carbon content. Each cavity of particulate additive, in a bar of 25 to 32 mm in length, can for example be 10 to 18 mm long with a diameter of 3 to 4 mm which can reduce in some way towards each end. The continuous single pass method and apparatus of the invention can be operated efficiently at commercial speed (for example about 200 mm per minute); transverse, for example pneumatic transport and injection, radial of the particulate additive maintains the separation and maximizes the precise location and confinement of the cavities thereby reducing or eliminating waste or variable quality product due to additive dispersion or cavity coalescence; this is because the transverse pneumatic travel path can be short - for example, in the illustrated device the distance from the inlet 46 of the valve to the injection point can be only about 135 mm, and even shorter distances are feasible. The device The pneumatic injection employed in the present method and apparatus is advantageous by itself, compact and efficient and rapidly adaptable to most or all conventional cigar filter making machines. In this way such adaptation to conventional machinery requires by much minor modification or replacement of the accumulation funnel to accommodate a cylinder or side injector duct, and / or perhaps to provide additional vents for the extraction of the pneumatic injection gas; and even such minor modifications may not be necessary if the injector cylinder extends obliquely or axially of and through the open mouth of the accumulation device and / or there is provision for lateral extraction of the transporting gas upstream of the outlet of the accumulator. particle of the injector cylinder and outside the accumulation device. Accordingly, the invention also provides a device for use in injecting particulate additive into a row of tobacco cigarette filtering material, the device comprising an injector conduit that can be mounted to extend in (and preferably transversely to) such a row and having a valve for discontinuous supply of particulate additive in the conduit, means for repeatedly opening and closing the valve such that the particulate additive can enter the conduit when the valve is open, and means for receiving a constant high velocity stream of conveyor gas in the injector duct to transport the particulate additive supplied along the duct for discontinuous pneumatic injection in the row. The valve is preferably the same as or similar to that illustrated in Figures 2 and 3, as are the means for it to oscillate between the open and closed positions. The additive supply is preferably a reservoir for receiving and maintaining the particulate additive under pneumatic pressure, and more preferably the injector conduit extends through the reservoir. The device may have, upstream of the duct particle outlet, means for venting or extracting the carrier gas as described above and for the purposes indicated in the foregoing.