439 



4,236.532 



additive is applied by the present method and can be 

 varied within appreciable hmits by changing ink con- 

 centration, dot size or height, or by changing the den- 

 sity of printing, or by selecting the area of the wrapper 

 over which the dots are printed. 5 



BRIEF DESCRIPTION OF THE DRAWINGS 



The present invention is illustraled by (he attached 

 drawings, wherein 



FIG 1 ts a view of a paper cigarette wrapper, show- 10 

 ing one embodiment of arranging the additive dots. 



FIG. lA IS a histogram showing additive transfer 

 during the smokmg of a cigarette made from ihc wrap- 

 per of FIG I. 



FIG. 2 IS a view of a paper cigarette wrapper, show- 15 

 mg one embodiment of arranging the additive dots 



FIG. 2A is a histogram showing additive transfer 

 during Ihc smoking of a cigarette made from the wrap- 

 per of FIG 2. 



FIG, 3 is a view of a paper cigarette wrapper, show- 20 

 ing one embodiment of arranging the additive dots. 



FIG. 3A IS a histogram showing additive transfer 

 during the smoking of a cigarette made from the wrap- 

 per of FIG. 3. and 



FIG 4 IS an enlarged view of a paper cigarette wrap- 25 

 per having two different additives printed thereon 



The following examples illustrate the present inven- 

 tion: 



EXAMPLE I jQ 



A composition with suitable rheological properties 

 for batch screen printing tests was made up by adding 

 0.66 g, of silicon dioxide (Aerosil 200 obtained from 

 Degussa AG, Zurich) and 2. 56 g. of low viscosity car- 

 boxy methyl cellulose {Hercules CMC 7L Fj, 30 ml of 35 

 1.0 M solution of nicotine hydrogen tartrate. Using a 

 nickel screen, with a mesh size of 50. this mixture was 

 applied to one surface of a conventional cigarette paper, 

 of width 27 5 mm, and length 66 mm The printing 

 occupied an area of about 24y 51 mm. and took the 40 

 form of distinct, well separated dots of diameter about 

 250 microns and height about 50 microns 



About 7 mg of nicotine hydrogen tartrate were thus 

 deposited onto the paper at a density of 0.7 mg/cm- 

 The total cumulative transfer of nicotine, when this 45 

 paper was used with a tobacco substitute filler, of the 

 type disclosed in our British Patent Specification No- 

 1.431.045. amounted to 21% of the amount of nicotine 

 present on the printed wrapper. Furthermore, the pufT 

 number of the cigarette was not changed by the addi- 50 

 tion of the printing to the paper 



FIG 1 of Ihc accompanying drawings shows the 

 wrapper 4 with an area 5 which will surround the filler, 

 and pnnted with the series of dots, and an end portion 6 

 which m use will surround a filter plug FIG lA is a 55 

 histogram showing the total nicotine transfer during the 

 smokmg of each of the first ihird. second third, and the 

 third third, of the length of the cigarette It will be seen 

 that the transfer increases significantly from the begin- 

 ning to the end of the smoking of the cigarette 60 



EXAMPLE 2 



The ink of composition described m the preceding 

 example was applied to the surface of a conventional 

 cigarette paper in the pattern shown at 5A in FIG 2 of 65 

 the accompanying drawings With the same filler mate- 

 rial, the total cumulative transfer of nicotine was 18% 

 and FIG 2A is a histogram corresponding to FIG lA 



but in respect of the FIG. 2 example and showing how 

 the transfer is considerably Haitened although very 

 slightly increased at the end. 



EXAMPLE 3 



The experiment was repeated as in Example 2 but 

 with the pattern printed as shown at SB in FIG- 3 of the 

 accompanying drawings The total transfer of nicotine 

 was again 18% and FIG. 3A is a histogram also corre- 

 sponding to FIG. 1 A but in respect of the FIG 3 exam 

 pie This shows again a slightly uneven transfer but one 

 which is much more level than in the first example. 



These examples make it clear that the puff-by-puff 

 profile can be modified more or less at will by appropri- 

 ate profiling of the pnnted area of the wrapper 



In the above examples the nicotine transfer w-as deter- 

 mined in conventional fashion by causing the nicotine to 

 be deposited in a Cambridge filler attached to the 

 mouth end of the cigarette during a smoking test The 

 results with respect to the three examples are summa- 

 rised in the following table, in which FBN represents 

 free base nicotine: 



Nicoline Cumulaiive ttan%fer NonLiimuljiivL- '^J 

 loading mg lo Camhndge Hlier transfer in 



FBN/cig mg FBN/C"g Cambridce TiIht 



i 



VI 



EXAMPLE 4 



A further composition with suitable rheological 

 properties for batch screen printing tests was made up 

 from 20 g ot 1-docosene, 60 ml. of water. 4 g. of car- 

 boxy methyl cellulose (Hercules CMC 7 LF). 5 g. 

 Bentonite, 1,4 g. sorbitan monostearate (Span 60) and 

 1.4 g. polyoxycthylene sorbitan monostearate (Twccn 

 60). The last two of these constituents are surfactant-. 



This mixture was'screen overprinted on the wrapper 

 already printed with an ink containing the nicotine 

 hydrogen tartrate as described in Example 1. to give a 

 loading of about 3 mg of l-docoscnc on the paper The 

 paper was used m a cigarette as described m Example 1 

 and lest smoked The results shewed good smoke pro- 

 duction representmg good transfer of the I-docoscne 

 into the main stream smoke, and an improvement of 

 some 50% in the cumulative nicotine transfer. 



The appearance of the printed sample of the wrapper 

 produced in accordance with Example 4 is shown in 

 FIG 4of theaccom.panying drawings m which the dots 

 containing the nicotine hydrogen tartrate are shown on 

 a square matrix 7 and those containing the I-docosciie 

 on a square matrix 8 



We claim: 

 ^ ! A m''thod of producing a wrapper for a smoking 

 rod. the method comprising screen printing onto the 

 surface of the wrapper, a series of discrete dots of an ink 

 containmg an additive which will in use, upon approach 

 of the hot burnmg tip of the smoking rod, be transferred 

 and contribute to the main stream smoke dra\".n 

 through the rod to enhance the satisfaction to the 

 smoker, wherein the additive is one or more of a smoke 

 producing agent, a smoke nuclcation agent, a flavouring 

 agent and a physiologically active agent 



