IL36205A - Device for treating tobacco smoke and method for its manufacture - Google Patents

Description

Device for treating tobacco smoke and for its manufacture LIMITED 34329 is with a tobacco smoke treatment with a article made with or incorporating such a device and a method of manufacturing the device may comprise a filter and may include means for admitting air to the tobacco smoke stream or to the mouth to dilute the articles in which the tobacco smoke is diluted with fresh have been described in numerous published methods of manufacture that are to be employed are in general complex so that the resulting for example made in accordance with these are expensive and may be tobacco smoke treatment device according to the invention comprises a rodlike or tubular element of filaments or fibres which are adhered to each other at their points of contact and which extend to the circumferential surface of the element and there form a plurality of longitudinally directed device may be oircumferentially enclosed by an air permeable means of incorporation in a article so that air for of the smoke may enter the grooves and pass to the The article may comprise a a small or large a cigarette holder or a One application the invention is in the provision of a treatment especially in the form of a for direct attachment to a paper wrapped tobacco to form a filter by means of an enveloping strip of air for dilution into mainstream of the tobacco the device part of a pipe or a cigarette the of the pipe or holder is provided with a into which the element may Admission holes around the recess permit air to enter the grooves and pass to the In the embodiments described the application of the invention manufacture of cigarettes is For pipes and cigarette holders the element is made in the same but is made of greater length and of smaller so that it will fit into the stem of the pipe or The principal embodiments of the device according to the invention are shown in the drawings and described 1 shows a longitudinal cross section through part of a cigarette incorporating a device according to the 2 shows a transverse cross section along the lines of shows a perspective view of a ribbed rod device according to the 4 shows a perspective with part of the wrapper of a continuous rod which tobacco smoke filters he shows a unitary dua device according to the the embodiment of 1 and a paper wrapped tobacco rod 1 is joined by a paper tipping overwrap 4 to a mouthpiece 2 comprising an air permeable tube 3 of crimped continuous filaments of cellulose acetate which are bonded to each at their points of The overwrap 4 overlies and is adhered to a part of the tobacco rod 1 at Perforations in the overwrap lie to the end of the mouthpiece 2 which abuts the tobacco rod Between the overwrap 4 and tube is a strip 7 of air permeable This envelopes the tube 3 and is secured tightly and closely around it by a lapped and stuck Alternating adjacent longitudinally directed ridges 12 and grooves 13 form the circumferential surface of the tube i e strip 4 of tipping paper is secured by lapped stuck 10 around the strip It is also adhered to the strip 7 and to the wrapper 11 of the tobacco rod Adhesive is omitted in the region of the perforations to ensure that they are quite The air permeable paper strip 7 facilitates the adherence of the tipping paper 4 and the handling of the mouthpiece by the filter cigarette assembly machine which joins it to the tobacco The use of quick tack adhesives and suitable assembly machines enables the tube 3 to be joined directly to stri without using the strip When the cigarette shown in 1 and 2 is air enters the perforations passes along the grooves and enters the at the same time as the tobacco which passes through the bore 14 of the tube Dilution occurs in the mouth of the In the embodiment of a rod element 20 of bonded filaments is Shis is provided with alternating ridges 21 and grooves 22 around its circumferential sur It may be used the same way as the tube 3 in In the embodiment of a portion of a continuous rod 30 is In this portions 31 are grooved rod elements as shown in 3 and described Portions 32 are in endwise abutting relationship with portions 31 and comprise rod without of crimped continuous filaments of cellulose which are bonded to each other at their points of can be seen at Enclosing the elements and holding them is a continuous wrapper 34 of air permeable paper which is enveloped about the elements and in place by a lapped and stuck rod may be divided by the filter making machine and by the filter cigarette machine at the lines 39 and 40 to produce dual filter rods which may be joined to tobacco rods with either the ribbed or unribbed portions adjacent to the tobacco When the ribbed portion is adjacent to the the cigarette end has the appearance of conventional filters of packed grooves may be obstructed by shreds of This reduces the entry of tobacco smoke into the groove but unless the shreds penetrate far it does not affect the entry of air through the perforations in the tipping When the ungrooved portion is next to the the end appearance of the cigarette is as shown at By dividing the rod 30 at lines 37 and 39 triple which has an end of conventional can be The being spaced from the other cannot be obstructed by shreds of In a filter cigarette this triple filter is attached to a tobacco rod by a tipping overwrap that is perforated where it overlies the portion after passing through the and the permeable wrapper 34 enters the grooves 42 and passes through the peripheral region of filter rod 32 where it encounters some resistance thus limiting the amount air In further the arrangements shown in 4 and described are grooved rod elements are however replaced by grooved tubular elements such as those of 1 and She advantages and disadvantages are similar to those referred to however in a cigarette having a filter with a triple configuration in which a grooved tubular element occupies a central position between two rod elements and in which perforations in the tipping overwrap overlie the part of the air entering the perforations will enter the tube and mix with the tobacco The remainder will be drawn along the peripheral of the rod element 32 at the mouth end of the In the embodiment of the element 50 has a unitary form which in the previously described embodiments has been achieved by the combination of two end 51 has a circular cross section and at the end 53 are the terminations of the alternating ridges 52 and grooves It is attached to a tobacco rod preferably with the end adjacent to the provides an easier path for the is to the The element may be enveloped air permeable paper before attachment to a tobacco Other filter rods may be joined to the ridged and grooved filter elements described above in place of the filter rods of bonded filaments of cellulose For rods of longitudinally embossed paper may be In flavouring constituents be The tubular and rod like elements may be combined with known filter elements in any desired configuration to produce the aesthetic or organoleptic effects that are The grooved tubular or rod like body may be conveniently made by using crimped continuous filaments of cellulose acetate and bonding to each Other fibrous or filamentary material may also be Such methods will comprise the steps of providing a filamentary or fibrous applying a bonding constituent to forming the material and the bonding constituent into a rod or activating the bonding to adhere the fibres or filaments to each other at their points of contact and forming longitudinally directed grooves in the peripheral of the rod or tube before or after the activation of the bonding In a preferred embodiment of the using crisped continuous filaments of cellulose the filaments are supplied to a filter making machine in which they are longitudinally stressed to separate them from each formed into a spread thin layer and sprayed and by means of a and an endless through a tubular In is passed in a radial direction directly into contact with the so that they are rapidly heated by the solvent action of the glyceryl caused to adhere to eac die at its end is provided with inwardly directed protrusions which the hot bonded filaments of cellulose acetate into a form having a grooved for example that shown in produce a tubular the die is provided with a coaxial The drawn through the arrange themselves between the and the die and are set in the form a grooved when the glyceryl triacetate is activated by the effect of the In an alternative the filaments of cellulose acetate are passed to the apparatus described in Patent Specification She permeable endless tape which forms part of that apparatus is provided with longitudinally directed ridges and grooves by making it with very coarse greater than 5000 warp hese themselves into the steam heated soft cellulose acetate to form longitudinally directed grooves and leave ridges between In the embodiments of the method of the invention herein it is advantageous to the rod or tube element after formation and before cutting in o lengths or combining it with other filters or tobacco rod In one the with or without filter rods of conventional is enclosed by perforated tipping or other tipping by the to a tobacco rod by a comparatively narrow or tip of leaves the perforations in the tipping paper embodiment has the advantage that its pressure drop and dilution rate may be tested before it is attached to a tobacco elements may be used to form embodiments of the invention in which tobacco smoke passes radially through a tubular ribbed or example a tubular element having a circumferential form of be joined by a overwrap to an externally grooved rod element of low permeability which abuts the end Smoke may pass along the grooves of the rod element along the grooves 54 and meeting resistance at the closed ends of the pass through the wall of the tube and be filtered as it enters the In another the same result is achieved by in endwise abutting a plain a grooved tube and a grooved rod of low permeability material and holding the three parts together by an enveloping paper insufficientOCRQuality

Claims (24)

1. A tobacco siaoke treatment device comprising a rod—like or tubular element of ilaments or fibres which are adhered to each other at their points of contact and which extend to the circumferential surface of the element and there form a plurality of longitudinally-directed grooves.

2. A device according to Claim 1 wherein longitudinally-directed grooves in the circumferential surface of the element extend from one end of the element and have a length less than the length of the element.

3. A device according to Claim 1 or 2 having, adjacent to and elreumferentially enclosing the element, a wrapper of air permeable sheet material.

4. A device according to Claim 3 wherein the wrapper extends from one end of the element to enclose and attach an adjacent filter rod by contacting the same over substantially the whol of its circumferential surface.

5. A device according to Claim 4 wherein the said adjacent filter rod comprises fibres or filaments which extend to its circumferential surface.

6. A device according to any of the preceding claims, having a circumferentially enclosing wrapper of perforated tipping material, the perforations of which are in communication with the grooves in the element.

7. A device according to Claim 1 wherein the element comprises a tube, the longitudinally-directed grooves in the circumferential surface of the tube being obstructed by a contiguous or endwise abutting ungrooved tube, the bore of the tube at the opposite end being obstructed by a grooved rod element of low permeability so that smoke passing axially enters the grooves and is filtered as it passes through the walls of the tube.

8. A iaethod of manufacturing a tobacco smoke treatment device according to Claim 1, comprising the steps of providing a filamentary or fibrous material, applying a bonding constituent to it, forming the material and the bonding constituent into a rod or tube, activating the bonding constituent to adhere the fibres or filaments to each other at their points of contact and forming longitudinally-directed grooves in the circumferential surface of the rod or tube before or after the activation of the bonding constituent.

9. A method according to Claim 8 in which a filamentary material is provided, and whic includes spreading the filaments thereof into a layer before applying the bonding constituent, and gathering the filamentary material and the bonding constituent into the form of a rod or tube having the longitudinally-directed grooves in its circumferential surface before activating the bonding constituent.

10. A method according to Claim 8 in which a filamentary material is provided, and which includes spreading the filament thereof into a layer before applying the bonding constituent, gathering the filamentary material and bonding constituent into the form of a rod or tube, activating the bonding constituent and thereafter forming the longitudinally-directed grooves in the circumferential surface of the rod or tube. 36205/3 NT - 12 -

11. * A method according to any one of Claims 8 to 10 wherein the bonding constituent is activated by heating.

12. A smoker's article comprising a tobacco rod, in combination with a device according to any of Claims 1 to 7.

13. Λ cigar or cigarette comprising a tobacco rod, abutting a device according to Claim 5 an attached thereto by a ring of sheet material, which is adhered to adjacent parts of the circumferential surfaces of the tobacco rod and the device so as to leave exposed the perforations in the tipping material enclosing the device.

14. Δ cigarette filter according to Claim 1 comprising a rod of bonded fibres or filaments the circumferential surface of which is formed at least in part into longitudinally-directed grooves which extend over the whole length of the rod, and a wrapper of air permeable material around the rod.

15. A filter according to Claim 14 attached to a cigarette by tipping paper having a plurality of holes near to the plane of abutment of the tobacco and filter rods.

16. A filter according to Claim 14 in endwise abutting relationship with a cylindrical rod of crimped cellulose acetate filaments, the air permeable wrapper extending without break over both of the rods.

17. · A device according to Claim 1 comprising an air permeable tube having longitudinally-directed grooves upon its circumferential surface and a perforate tipping overwrap around the tube. . 36205/3 - 13 -

18. A device according to Claim 1 comprising an air permeable tube having longitudinally-directed grooves upon its circumferential surface and Joined to a filter rod by an air permeable paper overwrap.

19. A cigarette attached to a device according to Claim 17 or 18 by a perforated tipping overwrap.

20. A tobacco sraoke treatment device substantially as hereinbefore described with reference to 3?i£S. l and 2 of the accompanyin drawings.

21. A tobacco smoke treatsent device substantially as hereinbefore described with reference to Fig. 3 of the accompanying drawings.

22. A tobacco smoke treatment device substantially as hereinbefore described with reference to Fig. 4 of the accompanying drawings.

23. A tobacco smoke treatment device substantially as hereinbefore described x*ith reference to Pig. 5 of the accompanying drawings,

24. A method of manufacturing a tobacco smoke treatment device substantially as described with reference to the accompanying drawings. For the Applicants ARTNERS ISiCB