as a proof that the paper according to the invention achieves the desired effect , seven different papers filled with tobacco particles were produced . the detailed parameters of the produced papers can be seen in the table of fig1 . the papers differ mainly in the mixing ratio of long fibers , short fibers and tobacco particles , wherein the values in the table of fig1 concerning long fibers , short fibers and tobacco particles refer to the mixing ratio among each other , that is to say in the “ share of fibers ”, and not to their absolute content in the paper mass . the share of long fibers in examples 2 - 7 was between 80 and 95 % by weight , the share of short fibers was up to 10 % and the share of tobacco particles was between 5 and 10 % by weight of the fiber share . in example 8 only short fibers and tobacco particles were selected as fibers . chalk was used as a filler , wherein , due to the purity , precipitated chalk was preferred , which is contained in the paper samples 2 - 6 in a share of 40 % by weight of the paper mass . paper sample 7 was produced entirely without chalk as inorganic filler . additionally , the paper was impregnated with a tobacco solution . the production of such a tobacco solution was carried out by production of an aqueous suspension of tobacco particles , which was stored for 24 hours at room temperature and then filtered . the extract was applied to the paper in the size press . the paper samples 2 , 4 , 5 and 7 were additionally impregnated with potassium citrate , paper sample 5 was furthermore treated with an aromatic substance encapsulated in cyclodextrine from the company mane . before mixing with the tobacco , the paper was shredded into pieces with a width from 0 . 4 mm to 1 . 0 mm and a length from 0 . 5 mm to 5 . 0 mm . cigarettes were manufactured using the paper samples 2 - 8 . the cigarettes had a length of 84 mm , a diameter of about 8 mm and a filter plug made from cellulose acetate with a length of 16 mm , which was connected to the tobacco rod by a tipping paper with a length of 26 mm the cigarette paper , which wrapped the tobacco rod , had an air permeability of 32 cu (= cm 3 /( min cm 2 kpa )), a basis weight of 25 g / m 2 and a chalk content of 26 % by weight . the cigarette paper furthermore contained 2 % by weight citrates as burn additive . as tobacco , a commercial american blend mixture of the brand batton was used . each cigarette contained a total filling quantity of about 800 mg . this was composed of 80 % by weight tobacco and 20 % by weight of the paper according to the invention cut into pieces , such that each cigarette contained about 640 mg tobacco and about 160 mg of the paper according to the invention . as a cigarette for comparison , a cigarette with the above technical data but with about 800 mg tobacco without the paper according to the invention was used . the cigarettes were smoked according to iso 4387 , and puff number , tar , nicotine and carbon monoxide were determined the results can be found in the table of fig2 . it can be seen that for all test cigarettes , which contain the paper according to the invention , a substantial reduction of smoke yields can be achieved . this reduction can be partially attributed to the fact that some of the tobacco was replaced by the non - combustible chalk , which is contained as filler in the test papers 2 - 6 . however , in accordance with the content of chalk in the cigarette , this can explain a maximum reduction by 8 %, and not , as was found in the experiments , by up to 70 %. additionally , also for test paper 7 , which does not contain chalk , a substantial reduction of smoke yields can be seen . finally , it can be seen that the reduction of smoke yields cannot be explained solely by a faster smoldering of the cigarette , as the puff number of all test cigarettes changes substantially less than would correspond to the reduction of the smoke yields . test paper 8 was produced without the use of long fibers and also caused a substantial reduction of smoke yields , wherein for this paper the short fibers were refined to achieve a sufficient mechanical strength , while for the other test papers they were used unrefined . however , if emphasis is placed on a higher mechanical strength , a sufficient share of long fibers will preferably be selected . thus , a surprising reduction of smoke yields can be seen , which cannot be explained solely by consideration of the materials used in the papers according to the invention . rather , apart from the sole replacement of tobacco by non - combustible material , an additional filter effect also seems to be present . the inventor supposes that the surprisingly clearly pronounced filter effect is caused by the special pore structure of the paper according to the invention and can be characterized by the diffusivity . for the test papers 2 - 7 there is a good correlation between the diffusivity and the reduction of smoke yields . for the data in fig2 for example , the coefficient of correlation between the parameters “ diffusivity ” and “ tar reduction ” as well as the coefficient of correlation between the parameters “ diffusivity ” and “ reduction of carbon monoxide ” is greater than 0 . 9 in each case . indeed , the filtration effect of paper is known per se , but the person skilled in the art would have expected the smoke condensate deposited in the paper according to the invention to be released again to the same extent in the subsequent combustion of this paper during smoking , such that the concerned components are smoked only with a time delay . as the measured values in the table of fig2 show , however , this is not the case . the inventor supposes that the filtration effect is so strong , that the smoke condensate is mainly deposited in the area lying next to the smoldering cone and that the smoke condensate is then released into the side - stream smoke during the smoldering phase following a puff , in which some of the paper according to the invention together with the deposited smoke condensate is burnt , such that it is not contained in the main - stream smoke taken up by the smoker during the subsequent puff the measurements show that the share of chalk in the paper samples has a significant influence on the reduction of smoke yields . this is based on the one hand on the fact that chalk is not combustible and thereby hardly contributes to the smoke yields , and on the other hand on the fact that it influences the diffusivity of the paper according to the invention . the values of 40 % by weight of the paper mass in the samples 2 - 6 and of 0 % of the paper mass in sample 7 show the extreme values . in many practical embodiments of the invention the chalk content will be in a middle range of this interval . a further means to influence the diffusivity is the share of long fibers , short fibers and tobacco particles in the paper . as is visible from the test papers 2 - 7 , a high content of unrefined short fibers and tobacco particles leads to a reduction of the diffusivity , for which reason these components can be effectively used to control the diffusivity and thereby also for the control of the reductive effect of the smoke yields . paper sample 8 shows a substantially higher diffusivity , but this test paper is not comparable in all respects with the test papers 2 - 7 due to the refining of the short fibers . the use of burn additives in the paper accelerates the smoldering of the cigarette and thereby reduces the puff number . for the paper samples 2 , 4 and 5 , which all contain about 2 % by weight of potassium citrate as burn additive , a reduction of the puff number by about 10 % could be achieved , which contributes to a reduction of the smoke yields approximately in the same ratio .
what is presented is a paper for mixing into the smokeable material of a smoking article , particularly into the tobacco rod of a cigarette , wherein the paper contains a share of fibers , which comprises pulp fibers and tobacco particles .