Tobacco – Tobacco or tobacco substitute product or component part thereof – Cigar or cigarette
Patent
1988-04-25
1989-12-26
Millin, V.
Tobacco
Tobacco or tobacco substitute product or component part thereof
Cigar or cigarette
A24D 102
Patent
active
048891452
DESCRIPTION:
BRIEF SUMMARY
It is well known that the burn and smoke characteristics of a smoking rod are affected by the porosity of the rod wrapper. The wrapper typically has a porosity of, for instance, down to about 20 Coresta or up to, for instance, about 200 Coresta.
It is known to obtain special effects as a result of perforating certain regions of the wrapper, this perforation generally giving the wrapper a porosity above 1,000, for instance 5,000 to 7,000, Coresta. In order to defer the effect of these perforations it is known to block the perforations with a material that is intended to unblock the perforations as the burning tip approaches them. See for instance U.S. Pat. Nos. 2,992,647, 3,511,247 and 3,526,904 and GB 1,439,778. Although these compositions may be such as to permit the perforations to open as the burning tip approaches they do have the effect of rendering the wrapper, where there are no open perforations, substantially wholly impermeable.
The present invention relates primarily to unperforated wrappers, e.g., wrappers typically having porosity values below about 200 Coresta. With such unperforated wrappers it is known that reduced porosity can result in increased tar delivery, increased puff number and increased carbon monoxide delivery. The increased tar can be desirable as it gives an improved sensation to the smoker. The increased puff number tends to be undesirable as (unless the tar is increased sufficient to compensate) the smoke is likely to appear weak. Increased carbon monoxide is undesirable, particularly when the ratio of carbon monoxide:tar is increased.
In U.S. Pat. No. 3,911,932 a wrapper having an initial porosity of about 15 to 30 Coresta (60 to 20 seconds Greiner) is coated at the burning cone end with a film-forming, porosity-reducing additive to give a porosity of around 5 Coresta (120 to 300 second Greiner).
The material that is coated at the burning tip is applied as a continuous coating and the porosity-reduction due to this material will persist substantially up until the moment when the wrapper coated with the material is burnt.
It is also suggested in U.S. Pat. No. 3,911,932 that it can be desirable to have an intermediate zone of medium porosity between the low porosity cone end and the higher porosity mouth end, the intermediate zone having a porosity of 6 to 18 Coresta (120 to 60 seconds Greiner). It can be achieved by applying the porosity-reducing material in a solution that is sufficiently dilute that the solution forms a discontinuous film on the substrate whereas at the cone end a continuous film is formed, so as to give less porosity.
The purpose of reducing porosity near the burning tip is to increase the tar in the smoke. Unfortunately it also increases the carbon monoxide and, in particular, can increase the ratio of carbon monoxide to tar. The low porosity at the burning tip inhibits free burn (burn of the rod when air is not drawn through the rod by the smoker).
With conventional smoking rods, there is a tendency for the tar delivery in the later puffs to be considerably higher than in the earlier puffs. As a result the smoking sensation in the early puffs is relatively weak and if the total tar delivery is increased, so as to give stronger earlier puffs, this inevitably leads to an even higher tar delivery in the later puffs. It would be desirable to be able to alter the profile of the tar delivery, so that there is less difference between the early and late puffs, and to do this without having adverse effects on other smoking properties. It would also be desirable to be able to increase tar delivery without having an adverse effect on other smoking properties and, in particular, without increasing the ratio of carbon monoxide:tar and without significantly increasing the puff number of the smoking rod.
In the invention a smoking rod wrapper material comprises a permeable substrate having a coated area in which the material is coated or impregnated with a coating of porosity reducing porosity-reducing substance, and the material is characterised in that the coating is
REFERENCES:
patent: 2992647 (1961-07-01), Figge
patent: 3511247 (1970-05-01), Tamol
patent: 3526904 (1970-06-01), Tamol
patent: 3699973 (1972-10-01), Tamol et al.
patent: 3911932 (1975-10-01), Houck, Jr. et al.
Adams Brian
Cunningham Linda
Gallagher Limited
Millin V.
LandOfFree
Smoking rod wrapper and compositions for their production does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Smoking rod wrapper and compositions for their production, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Smoking rod wrapper and compositions for their production will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1573067