AU462425B2 - Smoking material - Google Patents

Description

29. 901 P It is commonly accepted that smoke drawn from a

smoking material, such as tobacco, reconstituted tobacco,

or tobacco substitute, contains particulate matter and

vapour phase- constituents which are suspected of being

harmful to the health. We now find that surprisingly,

and in accordance with the present invention, the

particulate matter and vapour phase constituents in the

sm6ke from the smoking material, particularly reconstituted

tobacco or tobacco substitute, can be noticably reduced

with, if anything, an improvement in flavour, by incorporating

in the smoking material an appreciable quantity of basic

magnesium carbonate. The basic magnesium carbonate may be

incorporated in recorstituted tobacco or tobacco substitute

material in a proportion of between 10 and 30%, preferably

between 15 and 25% by weight of the total smokingImaterial,

although this proportion may be diluted if the smoking

material is blended, say, with natural tobacco prior to

making up into a smoking product.

We also find that the improvement in the smoking

material is enhanced if heavy basic magnesium carbonate

i.e. 3 MgCO 3 .Mg (OH) 2 4 H 2 0, is used as distinct from

light basic magnesium carbonate, i.e. 3MgCO 3 Mg(OH) 2

3 H2 0. V It is believed that the basic iagnesium carbonate

acts as an inorganic diluent which provides less organic

2 4624,25 possibly harmful to burn and thus produces less matter constituents, such matter and vapour phase particulate volatile acids. hydrogen cyanide, and steam as phenols, be important in these reductions may It isbelieved that smoke produced biological activity of the reducing the It may be tobacco sheet. from reconstituted particularly as a result of the heavy that this effect is increased basic magnesium carbonate producing, upon pyrolysis, carbon it also rate of combustion. which slows down the dioxide carbonate imparts, that the heavy basic magnesium appears to filter out material all improved capacity to the smoking smoke drawn through it. carbonate basic magnesium Although the heavy materials, all known smoking be used with advantage with may or base, such as cellulosic those with a polymeric including they are under- cellulosic or polyester materials, oxidised in particularly valuable when incorporated stood to be reconstituted tobacco tobacco materials, particularly natural by a paper making is usually prepared sheet. Such sheet mixed carbonate may be and the heavy basic magnesium process in sheet. For example slurry prior to casting the with the the fio. 1,139,01 described in British Patent the process cellulosic to the slurry of carbonate is added basic magnesium the web or process oefore of the water extraction residue coated with a the sheet is subsequently and sheet is cast spray dried powder aqueous solution of the concentrated process. the original extraction produced from used as a produced may be The smoking material

4624.25

29.901 wrapper cigarette filler or wrapper, or as a cigar filler, or inder. S-xample i

Cigarettes were made from IOQ reconstituted

tobacco sheet (RTS) containing 111 heavy basic magnesium

carbonate, in accordance with the modification of the process

described in British Patent No. 1,139,802 as mentioned above,

and control cigarettes were made from 100% RTS without

addition of heavy basic magnesium carbonate. The cigarettes

had physical dimensions length 72 mm, circumference 25.1 mm

and density 295 mg/cc at 14% moisture. The cigarettes were smoked to a 20 mm but on a

mechanical smoking machine designed to take one 25 cc puff

of two seconds duration every 60 seconds. The smoke collected

was analysed for dry particulate matter, phenols, steam

volatile acids and hydrogen cyanide. Substantial

reductions in smoke yields of the cigarettes containing

magnesium carbonate were demonstrated, as follows.

Smoke yield of CiaZettes of 100% RTS Cigarettes made containing 1W2 from normal RTS basic Magnesiu arbonate

k-~ matter 6.6 mg/cig 22.4 mg cig

Phenols 37 ug/cig 82 ug, cig

Steam Volatile acids 0.15 mg/cig 0.80 mg, /cig

Hydrogen Cyanide 67 ug/cig 170 ng, cig

Example II

Further cigarettes were made from 100% recon-

stituted tobacco sheets containing 15.4%, and

20.7% heavy basic magnesium carbonate. These had physical

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29 901 the same dimensions similar to those in Lxample I, and I, using smoke components were estimated as in Example identical smoking conditions. in vest- The following are the findings of this avy the level of he- igation and demonstrate how increasing oke improves the sm basic magnesium carbonate successively chemistry. Dry Particulate Phenols S.V.A. Hiydr ogen ide gcig Cigarette made Can from o matter mgugZci m c

RTS containing no heavy basic 170 iiagnesium 22.4 82 0.80 Carbonate RITS containing 146 3.7% heavy 13.6 52 0.34 basic AMagnesium Carbonate

RTS containing 140 8.7cA heavy basic 11.4 52 0.29 Iagnesium Carbonate

RTS containing 15.4% heavy 6.9 39 0.21 basic i.agnesium Carbonate

RTS containing 20.7% heavy basic 6.1 38 0.18 Magnesium Carbonate •xample III improved This investigation demonstrates the material by heavy filtering effect imparted to the smoking

basic magnesium carbonate. Cigarettes were made from

to the following physical normal reconstituted tobacco sheet mmi and density dimensions length 70 mm, circumference 25.5 and wet 250 mg/cc. These were smoked to a 20 mm butt

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29,901 1 particulate matter estimated. In addition some were cut to

a 50 mm length and attached to a 20 mm butt made from recon- stituted tobacco sheet containing approximately 20% heavy

basic magnesium carbonate. The 20 mm butts were of similar

circumference and density to the normal reconstituted tobacco

sheet cigarettes. These also were smoked and wet particulate

matter measured.

2he findings show wet particulate matter to be

reduced by 27A by replacing the normal 20 mm reconstituted

tobacco sheet butt by the butt made from reconstituted tobacco

sheet containing heavy basic magnesium carbonate. Hence the

magnesium carbonate sheet can be seen to act as a more

efficient filtering material.

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Claims (1)

1. 29.901 7t The Claims defining the invention are as follows:

   1. A smoking material comprising a reconstituted

   tobacco or a tobacco substitute, incorporating heavy basic

   magnesium carbonate.

   2. A smoking material according to claim 1, in

   which the heavy basic magnesium carbonate is incorporated

   in a proportion of between 10O and 350 by weight of the

   total smoking material.

   3. A.smoking material according to claim 2, in

   which said proportion is between 15>o and

   4. A reconstituted tobacco sheet incorporating

   heavy basic magnesium carbonate and prepared substantially

   as hereinbefore described.

   DATED this TWENTY-3IGHTH day of KAY, 1975

   GALLAHER LIMITED

   Patent Attorneys for the Applicant SPRUSON ?ERGUSON

   4624.25