CA1220997A - Machine for manufacturing smoking rod wrappers - Google Patents
Machine for manufacturing smoking rod wrappersInfo
- Publication number
- CA1220997A CA1220997A CA000510957A CA510957A CA1220997A CA 1220997 A CA1220997 A CA 1220997A CA 000510957 A CA000510957 A CA 000510957A CA 510957 A CA510957 A CA 510957A CA 1220997 A CA1220997 A CA 1220997A
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- CA
- Canada
- Prior art keywords
- web
- machine
- rod
- deposit
- wrapper
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
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- Cigarettes, Filters, And Manufacturing Of Filters (AREA)
Abstract
ABSTRACT
A machine for processing a web for a cigarette rod wrapper cut from the paper web which is preprinted on its outer surface firstly with brand legend and longitudinally spaced registration markings, and then on its inner face with a profiled deposit of an additive such as a nicotine component. The registration markings are used both to ensure longitudinal registration of the printed deposit, and in the rod making machine to ensure that the rod is cut at the correct position. The registration marking is covered in use by a tipping wrapper which unites the rod with a filter element. The machine has an unwind wheel at a first end with initial and final printing stations through which the web is passed in series. The registration markings are printed on a first surface of the web at the initial station and the additive is printed on an opposed second surface of the web at the second station. A rewind wheel for the web is placed at a second end of the machine and a drier station extends substantially along the full length of the machine.
A machine for processing a web for a cigarette rod wrapper cut from the paper web which is preprinted on its outer surface firstly with brand legend and longitudinally spaced registration markings, and then on its inner face with a profiled deposit of an additive such as a nicotine component. The registration markings are used both to ensure longitudinal registration of the printed deposit, and in the rod making machine to ensure that the rod is cut at the correct position. The registration marking is covered in use by a tipping wrapper which unites the rod with a filter element. The machine has an unwind wheel at a first end with initial and final printing stations through which the web is passed in series. The registration markings are printed on a first surface of the web at the initial station and the additive is printed on an opposed second surface of the web at the second station. A rewind wheel for the web is placed at a second end of the machine and a drier station extends substantially along the full length of the machine.
Description
~L22~7 MACHINE FOR MANUFACTURING SMOKING ROD WRAPPERS
S The invention relates to a machine for making wrappers for cylindrical smoking rods, such as aigarettes and cigarillos, comprising a combustib]e tubular wrapper, usuaily made of paper or a tobacco based material, surrounding a combustible filler of tobacco and/or tobacco substitute.
It has previously been proposed to improve the burning characteristics, or to improve the satisfaction to the smoker, of such smoking rods by applying to the wrapper an additive, e.g. a burn control agen~, a smoke producing agent, a smoke nucleation agent, a flavouring a~ent, and/or a physiologically active agent, such agent affecting the burn rate of the wrapper and/or affecting, or being released into, the main stream smoke, upon 1 20 approach of the burning tip of the rod. We are particularly interested in the release into the main s~ream smoke of a nicotine component to enhance the satisfaction of a low tar cigarette. However, little practical coDsideration has been given to the manner in which such agents can satisfactorily be applied to the smoking rod wrapper.
For example, GB-A-1111077 discloses a smoking rod wrapper which is uniformly impregnated with a nicotine component. However this leads to a puff by puff increase in the nicotine concentration in the main stream smoke, owing to the continual condensing of the volatile components in the main stream smoke as it is cooled upon approaching the buccal end of the smoking rod.
To overcome this problem, it has been appreciated that it would be desirable to deposit the additive on the wrapper in a predetermined pattern ~æn~7 which results in unifor~, or a modified profile for the, puf~ by puff smoking qualitie6. Thus in our GB-B-2007078, we disclose screen printing on the inner surface of a smoking rod wrapper of a series of dots of an ink containing an additive such as a nicotine component, the printing being in a predetermined pattern such that the nicotine component loading decreases along the wrapper from the lit to the buccal end of the smoking rod. This earlier specification did not address the problem of how such wrapper could be used on a high speed cigarette making machine from a preprinted web of wrapper material, whilst ensuring that the printed deposit would be in the correct position along each cigarette. An advantage of dots or discontinuous coating is that the flexibility of the wrapper is maintained. An incidental advantage of profile printing is that the wrapper porosity changes a smaller amount as the product is smoked because the printed dot areas are less pervious than unprinted wxapper.
GB-A-1235692 discloses the printing of a smoking ~- rod wrapper with a burn accelerating agent in a predetermined pattern and suggests that the printing could be incorporated into the process of manufacture of the smoking rod as an additional stage during the feeding of the continuous wrapper web into the rod forming section of a continuous rod making machine.
This would alleviate the problem of correct positioning of the printed deposit along each smoking rod length into which the continuous rod is subsequently to be cut, provided that the printing station and rod cutting knife were synchronized and by means of a conventional advance and retard mechanism and adequate compensation were made for stretch of the wrapper between the printing and cutting stations. However this is not a practical ~Z(~997 ~olution ar w0 are concerned not wlth the printing of the minimu~ quantity of an ink necessary for visible legend, ~ut the deposit of a much highex loading of an additive~ Such quantitie~ of additive require a significant volume of carrier liquid, which is preferably evaporated prior to the wrapper being curled to encircle the filler in the rod-making machine. At the speed at which a modern rod-making machine operates, the printing and evaporation of the solvent on line with the rod making, would req~ire an unacceptably long machine. A further disadvantage o~
printing on the rod forming machine is that liquid toxic material has to be used on the rod making machine or in the making area, there~y introducing health and safety problems and requiring special precautions.
In a metho~ here described of processing a web of smoking rod wrapper, the web is passed through initial and final printing stations in series, and then reeled up for ~ubsequent use on a continuous tobacco rod-making machine; the web being printed at the initial printing station on one surface with a regularly longitudinally spaced registration marking, and being printed at the final printing station and on i~s other surface with a repetitive regularly spaced pattern of a deposit containing an additive which is arranged to improve the smoking qualities of the resulting smoking rod.
The width of the printed deposit will usually be less than the width of the wrapper used on the tobacco rod-making machine so as to allow a normal adhesive lap seam to be formed on the rod-making machineO
A wrapper web produced in this way is then substantially ready for unreeling and use on a continuous rod-making machine, in which case the surface of the wrapper on which the registration ~l~2(~7 ~arking i~ printed will be used on the out~ide, where the regi~tration ~arking i8 clearly visible, and the printed deposit will be on the inside of the wrapper, where it i~ hidden from touch and view. The rod-making machine will then incorporate a sensor which recognises the paSSing of the registration marking to control the phase and frequency of the knife which cuts the smoking rod into sections or by similarly controlling the paper drive. This will ensure that the printed deposit incorporating the additive will be positioned correctly in the subsequent individual smoXing rods.
The registration marking may consist of the conventional printed legend or so called 'monogram' on the outer surface of a smoking rod, representing the malce or brand, and which is normally printed on line by the rod-making machine. In this case of course it will be preprinted. However it is unusual for such legend to be sufficiently bold or to have a sufficiently well defined leading edge for reliable recognition by an optical sensor and the registration marking is preferably bold printing in the form for example of a dot or transverse bar. Also the pitch of the legend on a filter tip cigarette alternates short and long, adding up to two tobacco rod lengths, so as to suit the tipping machine used after the tobacco rod-making machine. Since the registration marking will be on the external surface of the wrapper, and may well be unsightly, in the case of a smoking rod with a filter tip connected to the tobacco rod by a conventional simulated cork wrapper, the registration marking is preferably arranged to be positioned immediately adjacent to the filter tip, and hence covered by the overlap of the simulated cork wrapper. This hides the marking from view in the finished smoking rod product but if, by chance, the marking becomes visible on the outer surface of the product, i~ i8 immediately apparent to the operator of the rod-making machine that registration has failed, and hence that the hidden printed deposit on the inner surface of the wrapper i5 wrongly positioned along the individual smoking rods. The machine must then be ~ stopped and the fault corrected. Normally this correction would be part of the paper speed control and rejection of faulty cigarettes would be automatic using an extra reject input to the normal nucleonic cigarette weight control reject system.
Conventional legend may be printed on the one surface of the wrapper web simultaneously wit~ the registration marking. However if different colours are required, there may be two of the initial printing stations~ one for printing the registration marking and the other for printing the conventional legend. This is a convenient place to print the legend since at this stage the wrapper web is still essentially flat and accurate fine printing can be carried out. Also it is preferable to do all printing before the coating of additive deposit is applied to avoid, after coating and in line with the coating, a printing roller nip on the incompletely 2S dry and discontinuous coating. By contrast, if the legend were printed in the conventional manner on line by the rod-making machine, the non-uniform projection of the heavy additive-containing deposit on the other surface of the wrapper web would make adequate support of the web for fine printing difficult. Also the monogram printer on the rod-makiny machine would have to be synchronised with the pre-printed registration marks.
The initial printing station or stations and the final printing station must be sufficiently spaced for the printed registration marking and printed legend on the one surface of the wrapper web to dry, ~2~
either naturally or assinted by a drier, before the additive-containing deposit is printed on the other 6ur~ace o~ the wrapper web. Thi8 spacing may typically amount to 5m. and, if the wrapper web is pulled through the printing stations, the web may stretch to an indeterminate extent before it reaches the final printing station, resulting in slight inaccuracies in the positioning of the additive-containing deposit relatively to the registration marking. This is particularly serious if the wrapper web is for use in maXing back to back filter tip cigarette or other smoking rods, in which case if the pattern of printed deposit applied in the final printing station extends across two smoking rod lengths, any inaccuracy in position will lead to significant differences between the effects of the additive in adjacent smoking rods cut from the same double rod length~ In order to overcome this ~#~ problem, the registration marking may be used for registration of the wrapper web with the final printing station. This would be achieved by providing a sensor~ particularly an optical sensor, adjacent to the final printing station and responsive to the registration marking printed in the initial printing station, and controlling an advance and retard mechanism for the final printing station accordingly. The registration marking then has the synergistic function both of controlling the accurate printing of the additive-containing deposit relatively to the registration marking, and subsequently in the rod-making machine of controlling the position of the additive-containing deposit relatively to tne individual cut rod lengths.
The additive-containing deposit may be applied in the final printing station by a screen or grav-]re printing process and the amount of wet deposit may be sensed by for example an infrared monitor past which ~2~
the web is drawn. The liquid carrier for the additive will need to be evaporated be~ore the web i8 handled further and the web i6 preerably passed through a drier. The dry additive-containing deposit may then be checked by for example a ~apacitance monitor which senses changes in capacitance between electrodes due to the deposit on a strip of the moving web and senses variation~ in the deposit according to the desired pattern of deposit. A novel feature is that the repetitive patterns of deposit may be measured relatively to the unprinted web between patterns and hence the pattern profile sensed.
The printed wrapper web may be reeled up `on a driven reel posi~ioned downstream of final nip rollers which are at least part of the means by which the web is dr~wn through the printing drying and inspection stations. As previously mentioned, the heavy additive-containing deposit projects nonuniformly ~rom the surface of the wrapper web and this can cause problems when the web is reeled up.
Normally a flat web would be reeled up under constant tension. However as the radius of the reel grows upon reeling up, the radially inward layers of reeled web become more highly compressed radially and the circumferential tension decreases. In the case of the present web, with its heavy discontinuous deposit on one surface, this can cause loss of tension and crumpling of the inner layers, making it difficu1t to use the web in these layers subsequently in slitting and in a continuous rod-making machine. According to an independent aspect of the invention therefore a wrapper web, having on at least one surface a heavy discontinuous deposit is reeled up on a reel which is rotated under substantially constant torque.
The substantially constant torque may be provided by a constant torque electric ~otor. The substantially constant torque ensures that the tension, as the outer layer ia wound on, actually decreases as the radius of the reel increases as a result of the laid layers of web, and this helps to compensate for the co~pression problem.
For convenience, when the wrapper web is being printed, it will hav~ a width corresponding to a multiple, for example between twelve and twenty-five, individual smoking rod wra~per widths. In such case, the final nip pull-through roller on the coated surface of the web is then pre~erably relieved in line with the longitudinal lines of deposit. The reeled web will then be processed on a conventional slitter to divide the reel into narrower reels of web of individual smoking rod wrapper widths, for use on a continuous rod-making machine.
More particularly, in accordance with the invention, there is provided, a printing machine for processing a web of smoking rod wrapper, said web having opposed first and second surfaces, said machine comprising an unwind wheel adjacent to a first end of said machine; initial and final printing stations in series;
means for passing said web through said initial and final printing stations said initial printing station being adapted to print on said first surface of said web a regularly longitudinally spaced registration marking, and said second printing station being adapted to print on said second surface of said web a repetitive regularly spaced pattern of a deposit containing at least one additive selected from the group comprising a burn control agent, a smoke producing agent, a smoke nucleation agent, a flavoring agent and a physiologically active agent; a rewind wheel adjacent 3~ to a second end of said machine for reeling up said web for subsequent use on a continuous smoking rod-making machine; and a drier station extending substantially along the full length of said machine; said initial printing station being located to the side of said final printing station nearer to said second end of said machine.
This particular layout has the benefit that, i~mediately after passinq through the final ~rinting station, at which the heavy wet additive containing deposit is printed on the web, the web can be guided I~Z2~ 17 by appropriate rollers engaging only the one face of its sheet on which the now dry registration marking has been printed, through the drier station which extends for the ~aximum distance along the length of the machine wi~h ~inimum changes of direction during which the still wet deposit might be disturbed.
The drier station preferably incorporates a housing through which the web is drawn, the housing containing nozzles which direct hot air against th~
wet deposit on the web. This provides a rapid but low temperature drying effect, which is particularly important if the deposit contains an additive which : is susceptible to high temperature.
If the substantially dry deposit is to be monitored using a capacitance monitor as previously mentioned, it is important that the capacitance monitor sensor is situated extremely closely to the adjacent moving web and it is important that at this point the web is extremely flat without any creases or flapping, which could bring the sensor into 1 damaging contact with the web, or affect the response of the sensor.
This difficulty is overcome by a further independent feature according to which a discontinuous deposit on a web of material is monitored by moving the web past a stationary capacitance monitor having a sensor located immediately adjacent but spaced from one surface of the web; the other surface of the web being supported opposite to the sensor by a primary support and being supported upstream and downstream of the primary support by secondary supports, the arrangement being such that the plane of the web is deflected through a small angle in the same sense as it passes over each of the three supports.
This arrangement ensures only ligh~ contact or flotation between the web and the supports and serves to smooth out any wrinkles in, or flapping of, the web. The small angle may be less than 5 at the primary support. The primary support may be a smooth plate, preferably with air flotation to reduce and ~2~
provide cooling, and the ~econdary .~upports ~ay be rollers to and from which the web i~ led over further rollers .
ln a convenient arrangement in which the web has been printed w;th multiple parallel tracks of the deposit, it may be desirab~e to provide more than one of the sensors. In practice we find it is appropriate to provide one sensor on a track adjacent to each edge of the web and one or two sensors on tracks adjacent to the centre of the web. In order to provide accurate alignment transversely of the web between each sensor and the track to be sensed, the sensors are preferably mounted on a bar which has a fixed yap relative to the pri~ary support and overlies the web, the se~sors being arranged to be moved to and fro with the bar and to be fixed in a selected positio~ on the bar.
It is also advantageous continuously to monitor the pitch of the regifitration marks for cyclical or long term variations. Preferably this can be done using ~wo optical sensors on one or ~ore tracks spaced at the nominal pitch together with appropriate timing electronics. ~These sensors can conveniently be mounted adjacent to or on the capacitance monitor. Variations in pitch can be very troublesome at the subsequent rod making stage.
Visual inspection of the surface of the moving web on which the additive~containing deposit has been printed, is desirable prior to reeling up. In a normal printing or other web handling machine, the web is normally passed up and down and to and fro over rollers or other guides which extend transversely to the length of the machine. However this is inconvenient for visual inspection of the web since the operator has to be in line with the machine to inspect the web and then it is only convenient to do so at one or other end of the machine, where the unwind and rewind reels are situated.
~ ZZQ~7 In accordance with a further Eeature, web guide surfaces extend transversely to a nominal length of the machine, intercepting the web and deflecting the web onto at least two guide surfaces extending parallel to the nominal length of the machine, and between which the web passes with its plane facing laterally of the machine for visual inspection.
After visual inspection the web may be wound onto a rewind reel the axis of which extends parallel to the nominal length of the machine, but preferably a second air turner bar is used to bring the web back onto support surfaces ~tending transverseLy of the nominal length of the machine.
In a convenient configuration, two air turner bars are provided, one above the other, with their axes inclined at 45 to the nominal length o~ the machine. A horizontal run of the web is intercepted by one bar and turns the web so that it moves laterally to a side of the machine from whence it passes over a roller having its axis extending parallel to the length of the machine. From thence the web passes in a substantially vertical plane along the visual inspection path before passing around a second roller having its axis parallel to the length of the machine and hence into the machine and around the second air turner bar back onto a ; further horizontal path along the web contreline of the machine. This arrangement enables visual inspection of the web by an operator standing at the ; side of the machine and is particularly useful for inspecting the heavy deposit of an additive-containing printed pattern. The air turner bars have the advantage that they provide ~inimum re~istance to the web, which ;8 being drawn over them, and there is no direct contact between the web and bar.
Conveniently, when a capacitance monitor for deposit level is used as described, the monitor may be provided overlying the web at the lateral visual inspection point.
Specific embodiments of the invention and a machine for producing a wrapper web here described, and the resulting product and its use are illustrated diagram-matically in the accompanying drawings, in which:
Fig. 1 is a side elevation showing schematically the path of the web through the machine;
Fig. 2 is an isometric view showing an inspection point on the machine;
Fig. 3 is a vertical cross section through part of the inspection point.
Fig. 4 is a plan of part of a wrapper web produced on the machine; and, Fig. 5 is a partially exploded view of a filter tip cigarette incorporating part of the wrapper web of Fig. 4.
As shown in Fig. 1, a paper web 6 is drawn through the machine from an unwind reel 7, which is provided with an automatic brake to provide constant tension in the web, around a dancing roller 8, a web length coding disc 44 and through an infeed tracking 9 which centralizes the web transversely and infeed 10. Throughout its passage through the machine, the web is entrained around a number of transversely extending rollers 11, only one of which is specifically indicated in Fig. 1, but the purpose of all of which is clearly apparent from the drawing.
From the infeed unit 10, the web 6 passes through first and second initial printing stations 12 and 13 at which one (the top) face of the web is printed ~Z~)997 with brand legend or monogra~, and with transv~rse bar regiatration markings, respectively. The printing i~ carried out in multiple parallel track~, as will subsequently be explained with respect to S Fig. 4. The web then passes through a final printing or ~oating station 14 where the other (lower) face of the web is printed with a repetitive pattern of dots containing an additive, such as a nicotine componentO The printing in the station 14 is brought into register with the printing carried o~t in the stations 12 and 13 by optical recognition of the registration marking by means of a sensor 15. The sensor controls a conventional advance and retard mechanism at the station 14.
The loading of the wet deposit printed on the web in the station 14 ;s monitored by means of an infrared monitor 16~ Thereafter the web passes with the web coating ~ppermost through a hot air drier having two sections 17 in the form of an inverted shallow V, between which the web passes over guide rollers 18. This arrangement reduces flutter of the web within the drier.
After leaving the drier, and as shown in Fig. 2, the web is turned by means of an inclined air turner bar 19 and brought to one side of the machine where it passes downwards through an inspection point. As shown in Figs. 2 and 3, the web passes over a first roller 20, a second roller 21, a smooth primary support 22, a third roller 23, and a fourth roller 24. The rollers 21 and 23 form secondary supports and as the web passes over the rollers 21 and 23, and over the primary support 22, it is turned through a small angle of say up to 5. Opposite to the primary support 22 is a support bar 25, which has been omitted from Fig. 2 for reasons of clarity, and which supports a number of transversely spaced capacitance monitors 26. As the web passes between the support 22 and the monitors 26, the corre~ponding tracXs o~ the deposited additive are 6ensed and the output from the monitor6 26 i~ presented visually so that the loading of the deposit, as compared to the unprinted web, between the longitudinally ~paced additive deposits, is readily available.
Furthermore, the exposed outer face of the web, for example where it passes between the rollers 20 and 21, that is to say the face of the web bearing the additive deposit, is exposed for visual inspection by an operator standing to the side of the machine.
After passing through the inspection point, the web passes around a further stationary air turner bar 27 which brings the direction of movement of the web lS back into the longitudinal direction of the machine.
Thereafter the web passes over rollers 28 of a further tracking guide for transverse centralisation. The web is essentially drawn through the machine by a pair of nip rollers 29, the lower one of which engages the surface of the web on which the additive deposit has been printed, and is relieved annularly so as only to engage the web between the printed tracks. The web is then wound up on a rewind roll 30 which is driven at constant torque by a constant torque electric motor.
As shown in Fig.4, the web has, in this case, twelve parallel printed tracks 31A, 31B....31L. One surface of the web is printed with the transverse bar registration markings 32, and with the brand legend or monogram 33. The other surface of the web is printed with the dots of additive coating in the areas 34. If the additive comprises, e.g. a nicotine component, the concentration of the dots decreases longitudinally of the web in both directions away from a transverse centre line 35. After reeling on the reel 30, the web is subsequently unwound, slit along lines 36, and re-reeled into twelve individual )9g7 wrapper reel~. Each narrow reel i8 then used on a modlfied continuous tobacco rod-making machine, in which the exposed bars 32 are 3ensed and u6ed to control the synchroni~ation of the ~achine. The rod will be cut at the tran~verse line~ 35 and at the transverse lines 38 for the subsequent insertion of double length filter tips, which are united to the intervening tobacco rods by a conventional tipping wrapper which should cover the half width bars 32.
The resulting assemblies are subsequently cut through the centres of the filter tips into individual cigarettes.
A typical cigarette is shown in Fig. 5.` The tobacco rod 39 consists of a conventional filler 40 wrapped in the printed wrapper 41 which bears on its outer surface the half width regis~ration marking 32 and the brand legend 33, and on its inner surface with the concentration of printed dots 34. The concentration profile of which decreases from the lit end of the cigarette towards the buccal end. A
filter element 42 abuts the end of the tobacco rod 39 and is united to it by a conventional t;pping wrapper 43 which overlaps the tobacco rod 39 and conceals the half width registration marking 32.
S The invention relates to a machine for making wrappers for cylindrical smoking rods, such as aigarettes and cigarillos, comprising a combustib]e tubular wrapper, usuaily made of paper or a tobacco based material, surrounding a combustible filler of tobacco and/or tobacco substitute.
It has previously been proposed to improve the burning characteristics, or to improve the satisfaction to the smoker, of such smoking rods by applying to the wrapper an additive, e.g. a burn control agen~, a smoke producing agent, a smoke nucleation agent, a flavouring a~ent, and/or a physiologically active agent, such agent affecting the burn rate of the wrapper and/or affecting, or being released into, the main stream smoke, upon 1 20 approach of the burning tip of the rod. We are particularly interested in the release into the main s~ream smoke of a nicotine component to enhance the satisfaction of a low tar cigarette. However, little practical coDsideration has been given to the manner in which such agents can satisfactorily be applied to the smoking rod wrapper.
For example, GB-A-1111077 discloses a smoking rod wrapper which is uniformly impregnated with a nicotine component. However this leads to a puff by puff increase in the nicotine concentration in the main stream smoke, owing to the continual condensing of the volatile components in the main stream smoke as it is cooled upon approaching the buccal end of the smoking rod.
To overcome this problem, it has been appreciated that it would be desirable to deposit the additive on the wrapper in a predetermined pattern ~æn~7 which results in unifor~, or a modified profile for the, puf~ by puff smoking qualitie6. Thus in our GB-B-2007078, we disclose screen printing on the inner surface of a smoking rod wrapper of a series of dots of an ink containing an additive such as a nicotine component, the printing being in a predetermined pattern such that the nicotine component loading decreases along the wrapper from the lit to the buccal end of the smoking rod. This earlier specification did not address the problem of how such wrapper could be used on a high speed cigarette making machine from a preprinted web of wrapper material, whilst ensuring that the printed deposit would be in the correct position along each cigarette. An advantage of dots or discontinuous coating is that the flexibility of the wrapper is maintained. An incidental advantage of profile printing is that the wrapper porosity changes a smaller amount as the product is smoked because the printed dot areas are less pervious than unprinted wxapper.
GB-A-1235692 discloses the printing of a smoking ~- rod wrapper with a burn accelerating agent in a predetermined pattern and suggests that the printing could be incorporated into the process of manufacture of the smoking rod as an additional stage during the feeding of the continuous wrapper web into the rod forming section of a continuous rod making machine.
This would alleviate the problem of correct positioning of the printed deposit along each smoking rod length into which the continuous rod is subsequently to be cut, provided that the printing station and rod cutting knife were synchronized and by means of a conventional advance and retard mechanism and adequate compensation were made for stretch of the wrapper between the printing and cutting stations. However this is not a practical ~Z(~997 ~olution ar w0 are concerned not wlth the printing of the minimu~ quantity of an ink necessary for visible legend, ~ut the deposit of a much highex loading of an additive~ Such quantitie~ of additive require a significant volume of carrier liquid, which is preferably evaporated prior to the wrapper being curled to encircle the filler in the rod-making machine. At the speed at which a modern rod-making machine operates, the printing and evaporation of the solvent on line with the rod making, would req~ire an unacceptably long machine. A further disadvantage o~
printing on the rod forming machine is that liquid toxic material has to be used on the rod making machine or in the making area, there~y introducing health and safety problems and requiring special precautions.
In a metho~ here described of processing a web of smoking rod wrapper, the web is passed through initial and final printing stations in series, and then reeled up for ~ubsequent use on a continuous tobacco rod-making machine; the web being printed at the initial printing station on one surface with a regularly longitudinally spaced registration marking, and being printed at the final printing station and on i~s other surface with a repetitive regularly spaced pattern of a deposit containing an additive which is arranged to improve the smoking qualities of the resulting smoking rod.
The width of the printed deposit will usually be less than the width of the wrapper used on the tobacco rod-making machine so as to allow a normal adhesive lap seam to be formed on the rod-making machineO
A wrapper web produced in this way is then substantially ready for unreeling and use on a continuous rod-making machine, in which case the surface of the wrapper on which the registration ~l~2(~7 ~arking i~ printed will be used on the out~ide, where the regi~tration ~arking i8 clearly visible, and the printed deposit will be on the inside of the wrapper, where it i~ hidden from touch and view. The rod-making machine will then incorporate a sensor which recognises the paSSing of the registration marking to control the phase and frequency of the knife which cuts the smoking rod into sections or by similarly controlling the paper drive. This will ensure that the printed deposit incorporating the additive will be positioned correctly in the subsequent individual smoXing rods.
The registration marking may consist of the conventional printed legend or so called 'monogram' on the outer surface of a smoking rod, representing the malce or brand, and which is normally printed on line by the rod-making machine. In this case of course it will be preprinted. However it is unusual for such legend to be sufficiently bold or to have a sufficiently well defined leading edge for reliable recognition by an optical sensor and the registration marking is preferably bold printing in the form for example of a dot or transverse bar. Also the pitch of the legend on a filter tip cigarette alternates short and long, adding up to two tobacco rod lengths, so as to suit the tipping machine used after the tobacco rod-making machine. Since the registration marking will be on the external surface of the wrapper, and may well be unsightly, in the case of a smoking rod with a filter tip connected to the tobacco rod by a conventional simulated cork wrapper, the registration marking is preferably arranged to be positioned immediately adjacent to the filter tip, and hence covered by the overlap of the simulated cork wrapper. This hides the marking from view in the finished smoking rod product but if, by chance, the marking becomes visible on the outer surface of the product, i~ i8 immediately apparent to the operator of the rod-making machine that registration has failed, and hence that the hidden printed deposit on the inner surface of the wrapper i5 wrongly positioned along the individual smoking rods. The machine must then be ~ stopped and the fault corrected. Normally this correction would be part of the paper speed control and rejection of faulty cigarettes would be automatic using an extra reject input to the normal nucleonic cigarette weight control reject system.
Conventional legend may be printed on the one surface of the wrapper web simultaneously wit~ the registration marking. However if different colours are required, there may be two of the initial printing stations~ one for printing the registration marking and the other for printing the conventional legend. This is a convenient place to print the legend since at this stage the wrapper web is still essentially flat and accurate fine printing can be carried out. Also it is preferable to do all printing before the coating of additive deposit is applied to avoid, after coating and in line with the coating, a printing roller nip on the incompletely 2S dry and discontinuous coating. By contrast, if the legend were printed in the conventional manner on line by the rod-making machine, the non-uniform projection of the heavy additive-containing deposit on the other surface of the wrapper web would make adequate support of the web for fine printing difficult. Also the monogram printer on the rod-makiny machine would have to be synchronised with the pre-printed registration marks.
The initial printing station or stations and the final printing station must be sufficiently spaced for the printed registration marking and printed legend on the one surface of the wrapper web to dry, ~2~
either naturally or assinted by a drier, before the additive-containing deposit is printed on the other 6ur~ace o~ the wrapper web. Thi8 spacing may typically amount to 5m. and, if the wrapper web is pulled through the printing stations, the web may stretch to an indeterminate extent before it reaches the final printing station, resulting in slight inaccuracies in the positioning of the additive-containing deposit relatively to the registration marking. This is particularly serious if the wrapper web is for use in maXing back to back filter tip cigarette or other smoking rods, in which case if the pattern of printed deposit applied in the final printing station extends across two smoking rod lengths, any inaccuracy in position will lead to significant differences between the effects of the additive in adjacent smoking rods cut from the same double rod length~ In order to overcome this ~#~ problem, the registration marking may be used for registration of the wrapper web with the final printing station. This would be achieved by providing a sensor~ particularly an optical sensor, adjacent to the final printing station and responsive to the registration marking printed in the initial printing station, and controlling an advance and retard mechanism for the final printing station accordingly. The registration marking then has the synergistic function both of controlling the accurate printing of the additive-containing deposit relatively to the registration marking, and subsequently in the rod-making machine of controlling the position of the additive-containing deposit relatively to tne individual cut rod lengths.
The additive-containing deposit may be applied in the final printing station by a screen or grav-]re printing process and the amount of wet deposit may be sensed by for example an infrared monitor past which ~2~
the web is drawn. The liquid carrier for the additive will need to be evaporated be~ore the web i8 handled further and the web i6 preerably passed through a drier. The dry additive-containing deposit may then be checked by for example a ~apacitance monitor which senses changes in capacitance between electrodes due to the deposit on a strip of the moving web and senses variation~ in the deposit according to the desired pattern of deposit. A novel feature is that the repetitive patterns of deposit may be measured relatively to the unprinted web between patterns and hence the pattern profile sensed.
The printed wrapper web may be reeled up `on a driven reel posi~ioned downstream of final nip rollers which are at least part of the means by which the web is dr~wn through the printing drying and inspection stations. As previously mentioned, the heavy additive-containing deposit projects nonuniformly ~rom the surface of the wrapper web and this can cause problems when the web is reeled up.
Normally a flat web would be reeled up under constant tension. However as the radius of the reel grows upon reeling up, the radially inward layers of reeled web become more highly compressed radially and the circumferential tension decreases. In the case of the present web, with its heavy discontinuous deposit on one surface, this can cause loss of tension and crumpling of the inner layers, making it difficu1t to use the web in these layers subsequently in slitting and in a continuous rod-making machine. According to an independent aspect of the invention therefore a wrapper web, having on at least one surface a heavy discontinuous deposit is reeled up on a reel which is rotated under substantially constant torque.
The substantially constant torque may be provided by a constant torque electric ~otor. The substantially constant torque ensures that the tension, as the outer layer ia wound on, actually decreases as the radius of the reel increases as a result of the laid layers of web, and this helps to compensate for the co~pression problem.
For convenience, when the wrapper web is being printed, it will hav~ a width corresponding to a multiple, for example between twelve and twenty-five, individual smoking rod wra~per widths. In such case, the final nip pull-through roller on the coated surface of the web is then pre~erably relieved in line with the longitudinal lines of deposit. The reeled web will then be processed on a conventional slitter to divide the reel into narrower reels of web of individual smoking rod wrapper widths, for use on a continuous rod-making machine.
More particularly, in accordance with the invention, there is provided, a printing machine for processing a web of smoking rod wrapper, said web having opposed first and second surfaces, said machine comprising an unwind wheel adjacent to a first end of said machine; initial and final printing stations in series;
means for passing said web through said initial and final printing stations said initial printing station being adapted to print on said first surface of said web a regularly longitudinally spaced registration marking, and said second printing station being adapted to print on said second surface of said web a repetitive regularly spaced pattern of a deposit containing at least one additive selected from the group comprising a burn control agent, a smoke producing agent, a smoke nucleation agent, a flavoring agent and a physiologically active agent; a rewind wheel adjacent 3~ to a second end of said machine for reeling up said web for subsequent use on a continuous smoking rod-making machine; and a drier station extending substantially along the full length of said machine; said initial printing station being located to the side of said final printing station nearer to said second end of said machine.
This particular layout has the benefit that, i~mediately after passinq through the final ~rinting station, at which the heavy wet additive containing deposit is printed on the web, the web can be guided I~Z2~ 17 by appropriate rollers engaging only the one face of its sheet on which the now dry registration marking has been printed, through the drier station which extends for the ~aximum distance along the length of the machine wi~h ~inimum changes of direction during which the still wet deposit might be disturbed.
The drier station preferably incorporates a housing through which the web is drawn, the housing containing nozzles which direct hot air against th~
wet deposit on the web. This provides a rapid but low temperature drying effect, which is particularly important if the deposit contains an additive which : is susceptible to high temperature.
If the substantially dry deposit is to be monitored using a capacitance monitor as previously mentioned, it is important that the capacitance monitor sensor is situated extremely closely to the adjacent moving web and it is important that at this point the web is extremely flat without any creases or flapping, which could bring the sensor into 1 damaging contact with the web, or affect the response of the sensor.
This difficulty is overcome by a further independent feature according to which a discontinuous deposit on a web of material is monitored by moving the web past a stationary capacitance monitor having a sensor located immediately adjacent but spaced from one surface of the web; the other surface of the web being supported opposite to the sensor by a primary support and being supported upstream and downstream of the primary support by secondary supports, the arrangement being such that the plane of the web is deflected through a small angle in the same sense as it passes over each of the three supports.
This arrangement ensures only ligh~ contact or flotation between the web and the supports and serves to smooth out any wrinkles in, or flapping of, the web. The small angle may be less than 5 at the primary support. The primary support may be a smooth plate, preferably with air flotation to reduce and ~2~
provide cooling, and the ~econdary .~upports ~ay be rollers to and from which the web i~ led over further rollers .
ln a convenient arrangement in which the web has been printed w;th multiple parallel tracks of the deposit, it may be desirab~e to provide more than one of the sensors. In practice we find it is appropriate to provide one sensor on a track adjacent to each edge of the web and one or two sensors on tracks adjacent to the centre of the web. In order to provide accurate alignment transversely of the web between each sensor and the track to be sensed, the sensors are preferably mounted on a bar which has a fixed yap relative to the pri~ary support and overlies the web, the se~sors being arranged to be moved to and fro with the bar and to be fixed in a selected positio~ on the bar.
It is also advantageous continuously to monitor the pitch of the regifitration marks for cyclical or long term variations. Preferably this can be done using ~wo optical sensors on one or ~ore tracks spaced at the nominal pitch together with appropriate timing electronics. ~These sensors can conveniently be mounted adjacent to or on the capacitance monitor. Variations in pitch can be very troublesome at the subsequent rod making stage.
Visual inspection of the surface of the moving web on which the additive~containing deposit has been printed, is desirable prior to reeling up. In a normal printing or other web handling machine, the web is normally passed up and down and to and fro over rollers or other guides which extend transversely to the length of the machine. However this is inconvenient for visual inspection of the web since the operator has to be in line with the machine to inspect the web and then it is only convenient to do so at one or other end of the machine, where the unwind and rewind reels are situated.
~ ZZQ~7 In accordance with a further Eeature, web guide surfaces extend transversely to a nominal length of the machine, intercepting the web and deflecting the web onto at least two guide surfaces extending parallel to the nominal length of the machine, and between which the web passes with its plane facing laterally of the machine for visual inspection.
After visual inspection the web may be wound onto a rewind reel the axis of which extends parallel to the nominal length of the machine, but preferably a second air turner bar is used to bring the web back onto support surfaces ~tending transverseLy of the nominal length of the machine.
In a convenient configuration, two air turner bars are provided, one above the other, with their axes inclined at 45 to the nominal length o~ the machine. A horizontal run of the web is intercepted by one bar and turns the web so that it moves laterally to a side of the machine from whence it passes over a roller having its axis extending parallel to the length of the machine. From thence the web passes in a substantially vertical plane along the visual inspection path before passing around a second roller having its axis parallel to the length of the machine and hence into the machine and around the second air turner bar back onto a ; further horizontal path along the web contreline of the machine. This arrangement enables visual inspection of the web by an operator standing at the ; side of the machine and is particularly useful for inspecting the heavy deposit of an additive-containing printed pattern. The air turner bars have the advantage that they provide ~inimum re~istance to the web, which ;8 being drawn over them, and there is no direct contact between the web and bar.
Conveniently, when a capacitance monitor for deposit level is used as described, the monitor may be provided overlying the web at the lateral visual inspection point.
Specific embodiments of the invention and a machine for producing a wrapper web here described, and the resulting product and its use are illustrated diagram-matically in the accompanying drawings, in which:
Fig. 1 is a side elevation showing schematically the path of the web through the machine;
Fig. 2 is an isometric view showing an inspection point on the machine;
Fig. 3 is a vertical cross section through part of the inspection point.
Fig. 4 is a plan of part of a wrapper web produced on the machine; and, Fig. 5 is a partially exploded view of a filter tip cigarette incorporating part of the wrapper web of Fig. 4.
As shown in Fig. 1, a paper web 6 is drawn through the machine from an unwind reel 7, which is provided with an automatic brake to provide constant tension in the web, around a dancing roller 8, a web length coding disc 44 and through an infeed tracking 9 which centralizes the web transversely and infeed 10. Throughout its passage through the machine, the web is entrained around a number of transversely extending rollers 11, only one of which is specifically indicated in Fig. 1, but the purpose of all of which is clearly apparent from the drawing.
From the infeed unit 10, the web 6 passes through first and second initial printing stations 12 and 13 at which one (the top) face of the web is printed ~Z~)997 with brand legend or monogra~, and with transv~rse bar regiatration markings, respectively. The printing i~ carried out in multiple parallel track~, as will subsequently be explained with respect to S Fig. 4. The web then passes through a final printing or ~oating station 14 where the other (lower) face of the web is printed with a repetitive pattern of dots containing an additive, such as a nicotine componentO The printing in the station 14 is brought into register with the printing carried o~t in the stations 12 and 13 by optical recognition of the registration marking by means of a sensor 15. The sensor controls a conventional advance and retard mechanism at the station 14.
The loading of the wet deposit printed on the web in the station 14 ;s monitored by means of an infrared monitor 16~ Thereafter the web passes with the web coating ~ppermost through a hot air drier having two sections 17 in the form of an inverted shallow V, between which the web passes over guide rollers 18. This arrangement reduces flutter of the web within the drier.
After leaving the drier, and as shown in Fig. 2, the web is turned by means of an inclined air turner bar 19 and brought to one side of the machine where it passes downwards through an inspection point. As shown in Figs. 2 and 3, the web passes over a first roller 20, a second roller 21, a smooth primary support 22, a third roller 23, and a fourth roller 24. The rollers 21 and 23 form secondary supports and as the web passes over the rollers 21 and 23, and over the primary support 22, it is turned through a small angle of say up to 5. Opposite to the primary support 22 is a support bar 25, which has been omitted from Fig. 2 for reasons of clarity, and which supports a number of transversely spaced capacitance monitors 26. As the web passes between the support 22 and the monitors 26, the corre~ponding tracXs o~ the deposited additive are 6ensed and the output from the monitor6 26 i~ presented visually so that the loading of the deposit, as compared to the unprinted web, between the longitudinally ~paced additive deposits, is readily available.
Furthermore, the exposed outer face of the web, for example where it passes between the rollers 20 and 21, that is to say the face of the web bearing the additive deposit, is exposed for visual inspection by an operator standing to the side of the machine.
After passing through the inspection point, the web passes around a further stationary air turner bar 27 which brings the direction of movement of the web lS back into the longitudinal direction of the machine.
Thereafter the web passes over rollers 28 of a further tracking guide for transverse centralisation. The web is essentially drawn through the machine by a pair of nip rollers 29, the lower one of which engages the surface of the web on which the additive deposit has been printed, and is relieved annularly so as only to engage the web between the printed tracks. The web is then wound up on a rewind roll 30 which is driven at constant torque by a constant torque electric motor.
As shown in Fig.4, the web has, in this case, twelve parallel printed tracks 31A, 31B....31L. One surface of the web is printed with the transverse bar registration markings 32, and with the brand legend or monogram 33. The other surface of the web is printed with the dots of additive coating in the areas 34. If the additive comprises, e.g. a nicotine component, the concentration of the dots decreases longitudinally of the web in both directions away from a transverse centre line 35. After reeling on the reel 30, the web is subsequently unwound, slit along lines 36, and re-reeled into twelve individual )9g7 wrapper reel~. Each narrow reel i8 then used on a modlfied continuous tobacco rod-making machine, in which the exposed bars 32 are 3ensed and u6ed to control the synchroni~ation of the ~achine. The rod will be cut at the tran~verse line~ 35 and at the transverse lines 38 for the subsequent insertion of double length filter tips, which are united to the intervening tobacco rods by a conventional tipping wrapper which should cover the half width bars 32.
The resulting assemblies are subsequently cut through the centres of the filter tips into individual cigarettes.
A typical cigarette is shown in Fig. 5.` The tobacco rod 39 consists of a conventional filler 40 wrapped in the printed wrapper 41 which bears on its outer surface the half width regis~ration marking 32 and the brand legend 33, and on its inner surface with the concentration of printed dots 34. The concentration profile of which decreases from the lit end of the cigarette towards the buccal end. A
filter element 42 abuts the end of the tobacco rod 39 and is united to it by a conventional t;pping wrapper 43 which overlaps the tobacco rod 39 and conceals the half width registration marking 32.
Claims (5)
OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A printing machine for processing a web of smoking rod wrapper, said web having opposed first and second surfaces, said machine comprising an unwind wheel adjacent to a first end of said machine; initial and final printing stations in series;
means for passing said web through said initial and final printing stations said initial printing station being adapted to print on said first surface of said web a regularly longitudinally spaced registration marking, and said second printing station being adapted to print on said second surface of said web a repetitive regularly spaced pattern of a deposit containing at least one additive selected from the group comprising a burn control agent, a smoke producing agent, a smoke nucleation agent, a flavoring agent and a physiologically active agent; a rewind wheel adjacent to a second end of said machine for reeling up said web for subsequent use on a continuous smoking rod-making machine; and a drier station extending substantially along the full length of said machine; said initial printing station being located to the side of said final printing station nearer to said second end of said machine.
means for passing said web through said initial and final printing stations said initial printing station being adapted to print on said first surface of said web a regularly longitudinally spaced registration marking, and said second printing station being adapted to print on said second surface of said web a repetitive regularly spaced pattern of a deposit containing at least one additive selected from the group comprising a burn control agent, a smoke producing agent, a smoke nucleation agent, a flavoring agent and a physiologically active agent; a rewind wheel adjacent to a second end of said machine for reeling up said web for subsequent use on a continuous smoking rod-making machine; and a drier station extending substantially along the full length of said machine; said initial printing station being located to the side of said final printing station nearer to said second end of said machine.
2. A machine according to claim 1, wherein said drier comprises a housing containing nozzles adapted to direct hot air against a wet deposit on said web.
3. A machine according to claim 1, wherein said drier comprises at least two sections in the form of an inverted shallow V, and said means for passing said web through said machine comprises rollers upstream, downstream and between said drier sections whereby said web is adapted to be passed through said drier sections by entrainment over said rollers with said second surface of said web uppermost.
4. A machine according to claim 1, further comprising a stationary capacitance monitor having a sensor located immediately adjacent but spaced from one surface of said moving web; and, for supporting the opposed surface of said web, a primary support opposite said sensor and secondary supports upstream and downstream of said primary support; the arrangement being such that the plane of said web is deflected through a small angle in the same sense as said web passes over each of said primary and secondary supports.
5. A machine according to claim 1, wherein means for passing said web through said machine comprises web guide surfaces extending transversely to the length of said machine;
intercepting said web and deflecting said web onto at least two guide surfaces extending parallel to the nominal length of said machine, and between which guide surfaces said web passes with its plane facing laterally of said machine for visual inspection of said second surface of said web.
intercepting said web and deflecting said web onto at least two guide surfaces extending parallel to the nominal length of said machine, and between which guide surfaces said web passes with its plane facing laterally of said machine for visual inspection of said second surface of said web.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000510957A CA1220997A (en) | 1983-01-31 | 1986-06-05 | Machine for manufacturing smoking rod wrappers |
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB8302594 | 1983-01-31 | ||
| GB838302594A GB8302594D0 (en) | 1983-01-31 | 1983-01-31 | Smoking rod wrapper |
| CA000446432A CA1217105A (en) | 1983-01-31 | 1984-01-31 | Smoking rod wrapper |
| CA000510957A CA1220997A (en) | 1983-01-31 | 1986-06-05 | Machine for manufacturing smoking rod wrappers |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000446432A Division CA1217105A (en) | 1983-01-31 | 1984-01-31 | Smoking rod wrapper |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1220997A true CA1220997A (en) | 1987-04-28 |
Family
ID=25670282
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000510957A Expired CA1220997A (en) | 1983-01-31 | 1986-06-05 | Machine for manufacturing smoking rod wrappers |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1220997A (en) |
-
1986
- 1986-06-05 CA CA000510957A patent/CA1220997A/en not_active Expired
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| MKEX | Expiry |