A cigarette has a filter and an extensible helically wound mouthpiece extending beyond the filter. The mouthpiece may itself include an additional filter element.

The core of a cigarette is covered with a sheath made of material which does not generate any appreciable amount of smoke when the cigarette is sucked but burns when the cigarette is sucked. The material is made of starch, agar, gelatin or a mixture thereof.

A cigarette comprises a tobacco rod of tobacco filler wrapped in a paper wrapper, the circumference of the rod being within a range of 10 mm to 19 mm and the free burn rate of the rod being within a range of 25 to 45 mg min.sup.-1. The cigarette may comprise considerably less tobacco than a cigarette of orthodox circumference yet yield an equal or greater number of puffs.

In tobacco feeding apparatus in a cigarette making machine, "shorts" are collected from the tobacco supply and are mixed by tumbling in a hollow rotating member such as a drum forming part of a cigarette-making machine, e.g. a main feed drum, a refuser drum, or a shorts return drum. In one embodiment shorts are fed into rotating annular sieves one within the other and mounted in a rotating drum, so that the shorts are graded as well as mixed. The mixed shorts are later incorporated in the tobacc...

The invention is concerned with a wrapped cigarette and a method of producing the wrapper. A very highly porous wrapping paper, with an air porosity within the range from 2,450 to 20,000cm.sup.3 min.sup.-1 10cm.sup.-2 10cmWG.sup.-1 is produced by perforation from a base paper having a tensile breaking strength of not less than 85 g per mm width of paper. The means number of perforations is suitably within the range from 10 to 150 per cm.sup.2 of the paper and the mean diameter within the range f...

A self-extinguishing cigarette particularly when in contact with a flammable surface wherein the wrapper which encloses the body of tobacco is provided with a coating deposited from an aqueous solution of an alkali silicate. The silicate solution contains from about 17 to 27 percent by weight of SiO.sub.2. The coating area of the silicate solution on the wrapper is from about 40 to 84 percent of the entire outside wrapper area. The silicate solution may have added thereto various beneficial addi...

The invention concerns a method for modifying the peripheral conformation of a cigarette, which has an external, heat deformable, wrapper comprising a proportion of thermoplastic fibers or filaments. The method comprises the application of heat to the wrapper. Heat is applied by a heat forming means moved relatively and in contact with the cigarette, in a direction transverse to the longitudinal axis of the cigarette.

A smoking article which comprises a rod of smoking material contained within a wrapper has an air-permeability in a range of from 20 to about 120 Coresta units and is provided in the region of the mouth end, with ventilation means to give a degree of ventilation of 15 to 90%, the ratio of carbon-monoxide yield to tar yield of the smoking article being significantly less than 0.9. If the article has a tip means, the ventilation means may be provided, at least partially, in the tip means. The smok...

A cigarette comprises a cigarette rod of smokable material enwrapped in a cigarette wrapper and a filter tip attached at one end of said rod by means of a tipping wrapper, which tip comprises smoke-filtration means and is provided at its periphery with at least one groove extending to the mouth end of the tip, the cigarette wrapper, at the region adjacent the tip, being depressed inwardly to provide at least one cavity which is in communication with at least one groove and that portion of the ti...

A fire resistant cigarette has a wrapper having a coating applied as a dual treatment comprising the separate steps of coating the wrapper with a solution of an alkali metal silicate and coating the wrapper with a pH lowering material wherein the pH lowering material lowers the pH of the alkali silicate. The dual treatment of the cigarette is such that when the cigarette is smoked it produces a smoke which has a pleasing taste and the cigarette is fire resistant.