Smoke filter (Machine-translation by Google Translate, not legally binding)

DESCRIPTIVE MEMORY ·".··.

} · .. · · * This invention relates to filters. If * bi ^ in the objects of this invention are generally useful as filters, for example for tobacco smoke if it comes from cigarettes, cigars, pipes as similar, filters for cigarettes.

5- are of particular commercial importance and the description that follows is written mainly in terms of cigarette filters. - - _________ - ______

While filtration efficiency is an important property in cigarette filters, there must often be a commitment to provide a commercially acceptable combination of other properties, including pressure drop, taste, hardness, appearance and 4 cost For example, a cellulose acetate filter can have a relatively low filtration efficiency that could be improved by increasing the density of the filter material.

5 · or the length of the filter element, but only at coa * · gtas of an unacceptably high pressure drop. -------------------- X.w'w - - • · ·

...

• .. ·

Dilution by air has become popular · for com-:

• · think about the relatively low filtering efficiency of e · · »·

10. Cigarette filters with an acceptable pressure drop co • • • • • commercially. This technique uses ventilation air to dilute the smoke stream and therefore the tar and r * other undesirable constituents of the tabique smoke sucked into the roof. The ventilation air can penetrate tra- & G ·

15 · see from perforations in the nozzle paper that connects the filter to the tobacco column of the cigarette and if the filter is wrapped with paper for andullo, a paper for andullo is used, permeable to the air. ------- - ------ Air dilution is an economical method of re20. duct the level of tar in a controlled manner and also allows a reduction of undesirable gaseous constituents such as CO and NO. A drawback of air dilution is loss of flavor, particularly in the case of low tar cigarettes. A sa-

2 $. commercially satisfactory in some cases for enrichment of the flavor of the tobacco of the cigarette, but on the other hand not at tar levels lower than 5 mgs. - - - Because tobacco filters tobacco smoke, filters have been proposed in which there is tobacco to improve the taste of filtered smoke. Such previous filters have used

The tobacco is either in the form of fine particles or in the form of dispersed granules in a matrix bound to the primary filter material (for example, as it is given to conafcfer in the

• · · US patents nos. 2,948,282 and 3 * 353,543) or as a separate short column of loose shredded tobacco

10. to the main cigarette tobacco eolunm and "separated τ-^{3 w}· · * Of the same by an ignition suppressor disk, (for example as disclosed in US Pat. Nos. ⁹

3,288,145 and 4,091,821) or another filtrsRt material (for example as disclosed in the US patent k · a · "·

15. no 3,858,587). These constructs have been too bulky and / or costly for large scale production or ineffective to produce a commercially acceptable flavor levels very ba ^ os tar, particularly with air dolución. ---------------_ _ _ _ 20. The present invention provides a smoke filter comprising a coherent sheet snuff reconstituí do condénsala in axially elongated, having other fibrous filter ma terial contiguous and coextensive in length with it, the sheet having at least one recessed face ex25 · stretching out slots longitudinally of the filter. These grooves have a high surface area to make contact with the smoke which is enriched in flavor by extracting the tobacco taste from the sheet. The sheet may be of a strong tobacco blend and / or enriched in flavor to give a desired flavor. - - - -

5 · In the preferred filters according to the invention, an axially elongated element of fibrous filter material, for example cellulose acetate tow, is co • · · axially with the reconstituted tobacco element *. * One of • · To the elements is a core in the form of a bar, envilelto by • · · · «

10. the other. Although the reconstituted tobacco element can • · · form any of these coaxial parts, it preferably constitutes the core. In any case, the element fibrous filter material can have u,; resistance to the as-. · · · · · · · · tion greater than that of the reconstituted tobacco element, 15 * eon * io that the smoke will be directed mainly through the latter to optimize the tobacco smoke flavor enrichment, ------- Filters according to the invention can be easily manufactured by an automated process

20. Continuous as described in the patent application is the no. 489,942.

In a coaxial part filter as described above, the part of fibrous filter material can be constructed from continuous filamentous tow linked by

25. example, of cellulose acetate. ------ - ----- 5 ~

The filters of the present invention are suitable for use with air dilution or ventilation and can then, even at low tar levels, provide a commercially acceptable filtered tobacco smoke smoke, when the smoke and the air of ventilation that The crossings make contact with the high surface area of ​​the reconstituted tobacco and therefore are significantly enriched for tobacco flavor. The ventilated filters *. $ G. * The invention have also given a good elimination of CO and therefore

10. both a good tar / CO ratio in the smoke - filtered. • · ·

The invention is illustrated, by way of axis only, by the following description which has to be read in conjunction with the appended drawings, in which: - - ~ *. * · *. "- - - the Figure 1 is an enlarged perspective view 15. of a cigarette provided with a filter according to the invention; and Figure 2 is a broad terminal elevation view of the cigarette filter of Figure 1. _______

In Figure 1, a cigarette 10 with filter comprises a column 12 of cigarette tobacco and a filter

20. according to this invention * 4. The tobacco column 12 and the filter are butt-fixed to each other by a conventional nozzle paper wrap 16 with peripheral perforations 18 of air dilution. - - - - --- - ______ £ 1 filter 14 is composed of three alar elements

5·

10

Coaxial gages (Figure 2), a bar-shaped core 20 that is circumferentially wrapped by a tubular intermediate element 22 itself circumferentially wrapped by an outer wrapper 24 consisting of a tube of conventional air-permeable paper. Each elaman. to 20, 22 and 24 is of constant cross section over its entire length and is in close cooperation with element 1 or adjacent elements in order to avoid at least the axial passage of smoke and ventilation air, among them. .--------------------- - - - - Filter core 14 is a coherent sheet M • ·, ι of reconstituted tobacco that has been stamped uniformly with parallel longitudinal slots and then condensed * and linked. · · · ·, · ·. ·

R itself, to form a bar dimensionally * 'stable and 15 · auto tempters whose longitudinal axis extends parallel to the stamped slots. While the bar can be easily formed according to any desired geometric shape, it is illustrated in Figure 2 with a circular cross-section. ------------------------------ - ~ ~ - 20. The reconstituted tobacco sheet suitable for use in the present invention is commercially available material made from tobacco waste products, such as dust, fines, debris and winnowing of tobacco created during the first and secondary manufacture of tobacco in cigarettes. Several procedures are commercially practiced for the manufacture of tobacco sheet reconstruction, titrate it,

5. moving to form a coherent sheet of reconstituted tobacco. The reconstituted tobacco sheet produced by any of the known techniques is suitable "for use in the present invention. - ---- - - - AJk.- - - * • · ·

The intermediate element 22 of the mat filter 14 eq

10. The filter has a fibrous filter and has a resistance to aspiration greater than that of the core 20 so that the smoke passing through the filter is directed primarily through. elemen tn of reconstituted tobacco. One such element 22 can be * ·? - -Y^and • · · · formed from a continuous tow of filaments of ace

15 · bound cellulose to form a dimensionally stable and self-sustaining smoke-permeable body that defines sinuous paths for the passage of smoke through it. Other fibrous filter material may be used, for example, a filament tow of polyethylene or polypropylene, or

20. Nonwoven cut bras of the type described in US Pat. 2,297,041 and 3,552,400. ------- The terminal aspects of the filter 14 other than that of Figure 2 can be achieved by an appropriate conformation of the number 20 during the manufacture of the filter, by

25 · example, according to a triangular or square cross section

- you $

Modifications of the filters described above are possible according to the invention. Thus, in some embodiments, the air permeable paper for airfoil can be removed and the filter can be wrapped directly with paper 16 pa | /

5. nozzles, resulting in a maximum dilution of ai; 4 uniform re without the variables found in the papers for porulous andullo. ---________ · _ ··. ·. · _ _ _ _ • · ·

...

Yet another filter according to this invention has a core with the shape of a bar of filtering material.

10. Broso wrapped in a tube of reconstituted tobacco: · the tube · · · made from longitudinally slotted sheet and condense of reconstituted tobacco as well as the nucleus "of the fil • • • • • • • Figure 2, has in turn an outer shell of conventional waterproof paper for andullo. - - - - - 15. In another modification according to the invention, a longitudinally grooved coherent sheet of reconstituted tobacco and at least one coherent sheet (optionally similarly grooved) are condensed and bonded in a layered unitary bar at least one. ) of fibro filter material

20. such as cellulose acetate.

When the smoke passes primarily through the reconstituted tobacco ele- ment, which has a dark initial appearance, the staining of the fibrous filter material found in conventional filters is less noticeable and the

25 · terminal aspect of the filter can be quite the same before

- 9 to smoke that after

- · - = ·

Although the filters according to the invention are useful particles in conjunction with air dilution, they are also useful for providing a filtered filtered smoke.

5 "oue ci do in taste of tobacco in cigarettes filtered with * 1 vfiacionales without dilution by air.

To the consequent effects, the claims that follow are declared of novelty, property and utility for Spain, its territories and sovereignty plans. - - - -

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