FI58717B - CONTAINER REQUIREMENTS FOR THE FRAME STAFFING OF A TOBACCO FILTER - Google Patents

Description

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Patent · och registerstyraisan 7 Ansakin utltgd och uti-skrtfun puWicertd 31 · 12.Ö0 (32) (33) (31) Privilege claimed —Begird prloritet 0T · 05 · 7 3 US (US) 358126 (71) British-American Tobacco Company Limited, P.0. Box L82, Westminster House, 7 Millbank, London SW1P 3JE, England-England (GB) (72) John H. Sexstone, Middletown, Kentucky, USA (7M Oy Kolster Ab (5M Continuous method and equipment for making tobacco smoke filters - Kontinuerligt förfarande och anordning för framställning av tobaksrökfilter

In an effort to improve the absorption properties of tobacco smoke filters, various additives have been added to them in particulate or granular form. In this tax, fine charcoal, silica gel, volcanic salts, ion exchange resins, clay and the like, and other absorbents are incorporated therein. This insertion is made by dusting, spraying, sucking or otherwise putting the additives in the material which forms the main part of the filter structure.

This fibrous material may be paper, fluffy yarn, fibrous rope, or other material known in the art. When granular additives are applied to or sprinkled on the fibers, they tend to separate or move apart during the filter formation step or when the filter element or. in use. In addition, the release of particulate material may prove repulsive, especially when the released particles enter the smoker's mouth. In this respect, attempts to use adhesives to attach additives have not proved successful, as these adhesives generally render the absorption properties of the additives ineffective.

2,58717

Another method of making multiple filters, filters with granular or particulate additive material, involves obtaining short filter segments of selected material and arranging them at intervals and then inserting additives between the segments to obtain a multiple filter rod in which the granules are loose. The filter rod is optionally cut to obtain multiple filters with a grain portion between them. This method of manufacture, while effective, involves costs that significantly increase the cost of the particulate material incorporated. In addition, the acquisition of short filter plug parts and the introduction of particulate material as planned causes, especially in high-speed machinery, many difficulties, including losses and downtime of production machinery.

In the reform of these previously used or conceived working methods and methods, it has often been concluded that an oversized and expensive device is added to the assembly, which also increases the overall cost of the finished filter rods.

Several methods and devices have been proposed to overcome these disadvantages. For example, U.S. Patent No. 3,3T1,000 and Defensive Publication 775,576 disclose a method of placing a granular additive material at intervals in a continuously moving filter material. Finally, a filter rod with spaced apart sections containing granular material is formed.

There are still problems with the transfer of granular material in the working method based on U.S. Patent No. 3,371,000. This patent is directed to a method in which it is difficult to control the distribution of the granules and their placement in the formed cigarette rod so that the rod can be cut between the grain zones and thus prevent the granules from getting on the smoker's lips.

Another difficulty in depositing particulate material into a continuously moving web is contamination of the cutting surface and tobacco, respectively, due to the displacement of the particulate material. In addition, this situation is exacerbated by the triangulation of the spaced-apart particle pattern, as a result of which the pattern is not equally or concentrically arranged with respect to the center line of the rod. This phenomenon is caused by the combing pressure on the side of the rope of the rod forming machine, which results in the rotation of the spaced pattern in the finished rod.

According to immediate and factual information, neither of these patents has entered into commercial use for the purpose for which this invention is devoted.

A method of making tobacco smoke filters from a web of filter media which is continuous in its axial direction and which is continuously fed in the axial direction 3,58717 characterized in that the web is flattened to a predetermined width and the flattened web is conveyed to a U-shaped device against the surfaces, wherein the flattened web becomes approximately U-shaped, that the continuous coating is brought into contact with the lower surface of the U-shaped web, that the measured amounts of particulate material are taken from stock continuously and at certain intervals and placed U-shaped on the bottom the sides are then enclosed around the particulate material into a cylindrical rod around which the coating is placed and that the coated rod is then cut in a known manner into separate filters each containing at least one particulate material; pocket filled with.

Other objects and advantages will become apparent from the following detailed description, taken in conjunction with the accompanying drawings.

In the drawings: Figure 1 is a side view of a continuous filter rod forming machine; Fig. 2 is a portion of a filter rod molded by the machine of Fig. 1, with certain portions cut away, showing spaced apart cavities in the web containing a selected additive in the form of particles or granules; Fig. 3 is a sectional view taken along line 3-3 of Fig. 2; Fig. U is an enlarged, partially sectioned fragmentary view showing a metering wheel distributor connected to the granule feed hopper and an inlet and outlet channel forming part of this station; Fig. 5 is a partial sectional view taken along line 5-5 of Fig. 1+ showing the shaping of the filter material into a U-shape; Fig. 6 is a partial sectional view taken along line 6-6 of Fig. U showing the engagement of the lower part of the wheel with the filter material U and the discharge of granules from the measuring wheel; and Fig. 7 is a fragmentary sectional view taken along line 7'T of Fig. t showing a filter material to be formed into a uniform bar on the granules, the rod having spaced apart cavities containing these granules.

Referring first to Figure 1, the device 10 forms a multiple filter rod with spaced cavities of finely divided additive in the form of particles or granules.

This continuous rod is cut into parts by the device 10 and suitably removed from its discharge end. In Figure 2, a typical rod part 12 is molded with this device. A filter material, for example a fibrous cellulose acetate rope li +, can be used to form the wedding multiple filter rod part 12. Instead of cellulose acetate, the filter material may be paper fluffy 11 5 & 717 yarn or other fibrous rope well known in the art. The spaced cavities 16 may contain an additive 18 having the desired absorption properties. The particles 18 may be finely divided charcoal, silica gel, volcanic salts, ion exchange resins, clay and the like. A particular additive contemplated by this invention is the ion exchange resin "Duolite", which may be of the type disclosed in U.S. Patent No. 3,716,500, issued February 13, 1973.

The continuous cellulose acetate web is drawn from a conventional storage tank into a web opening unit 20 which spreads or extrudes the web in a manner well known in the art of filter making. The opened or applied web 22 passes through a conventional plasticizer distributor 2k. Triacetin is usually used as the plasticizer for the cellulose acetate web. The web with the plasticizer is transferred to the compression point of the discharge roller 26 and the roller 28. The continuously fed web then enters a horn 32 located at the inlet end of the particle distribution station 3i +. The horn 32 is designed to press the flattened web 22 into a substantially U-shape, as shown in Figure 5, ready to receive spaced apart particulate material inserts 18. The web 22 is fed to station 3 * + with a selected paper or coating protruding in the storage roll 38. The machine-operated pipe belt 1 + 0 contributes to the transport of the coating 36 through the cigarette stopper making machine 10 together with the web 22. Finally, the coating surrounds the web and contributes to the specification of the desired, substantially cylindrical shape of the filter rod.

The wheel dispenser station 3I + is shown in detail in Figures 1+ and 6 and operates to release measured amounts of selected particulate material at a distance from the horn 32 to the bottom of the U-shaped tissue web 22. The particulate material 18, which is fed from the hopper 1 + 2 by gravity, fills the cavities, depressions or pockets 1 + 1 + which arrive at predetermined distances with the circumference of the measuring wheel 1 + 6. Suction can be introduced inside the wheel 1 + 6 to help feed the particles into the pockets. When the pockets are full, the particulate material is held in them during the rotational movement of the wheel 1 + 6 by means of the retaining shoe 1 + 8 or by maintaining the above suction until the filled cavities reach the lowest point of the wheel 1 + 6 movement, where the material is then lowered onto the U-shaped surface of the web * le 22. At this point, suction can be introduced under the web by means of a vacuum system 50 to accelerate this transfer. The operation of the distribution wheel 1 + 6 is closely synchronized with the pipe belt 1 + 0 in a ratio of 1: 1, so that the circumferential speed of the wheel 1 + 6 approaches the speed of the coating 36 as well as the web 22.

The U-shaped rope 22 and the spaced-apart cartridges of selected particulate material 18 go immediately to the finisher 57 behind the wheel distributor station 3I +. · The rod forming and control unit 588717 operates to assemble and wrap the U-slit web 22. around the spaced apart particulate material charges 18. The substantially cylindrical web and the spaced cavities of the particulate material 18 therein, together with the coating 36, enter the finishing tongue, as is usually the case in filter rod making machines. The other edge of the edges of the coating 36 is then exposed to the adhesive applicator 5. The rod then enters an adhesive applicator 5 where an adhesive is applied to the other edge of the edges of the coating 38. The folding device 55 then grips this edge and folds it to the other edge so that the applied adhesive is intervened in order to seal the coating around the web. The coated web is fed through a heater 56 and immediately to a cutting station 58 where the coated rod is cut into pieces 12 (see Figure 2). The cutting of the rod is synchronized with the rotation of the wheel b6. The adjusting device 60 operates to match the circumferential movement of the wheel with the cut so that the cut occurs from the center of the cavities 16.

When the individual plugs of the rod portions 12 are cut, as shown in Figure 2, and fitted to the base end of the cigarette, the smoke of the lit cigarette enters the cavity 16 and thus exposed to particulate material as the smoker smokes the cigarette. In this way, the smoke can be conditioned in the desired amount by means of the selected particulate material 18.

The dashed lines 1 indicate the points where cuts can be made with the blade 58 of the manufacturing device 10 to obtain quadruple double filter rod parts of the type shown in Fig. 2. The quadruple rod portions are delivered to a filter tip mounting machine that cuts each quadruple rod portion in half to form two dual filter rod portions, each of which is connected in an axially aligned and end-to-end position to the two coated tobacco rods. The final cut is made along the centerline of the two-piece rod to form two double filter cigarettes.

Of course, separate and different additives can be mixed and placed in individual cavities 16. Therefore, more than one cavity 16 with the same or different additives 18 can be placed in each individual filter segment connected to the base of the cigarette to provide the desired smoke treatment.

Thus, many of the above-mentioned purposes and advantages are most effectively achieved. Although a specific-relatively preferred embodiment of the present invention has been disclosed and described in detail herein, it is to be understood that it does not in any way limit the present invention, the limits of which are set forth in the appended claims.

Claims (11)

A method for producing tobacco smoke filters from a web (22) of filter material, which is continuous in its axis direction and which is continuously measured in its axis direction, characterized in that the web (22) is flattened to a predetermined width, and the flattened web is flattened. a device having a cross-sectional U-shaped bottom (32) and its outer and inner sides are pressed against the surface of the device, whereby the flattened web is formed into approximately U-shape, so that a continuous cover (36) is brought into contact with the lower surface of the device. U-shaped web, measuring measured amounts of particulate material (18) is taken continuously and at given intervals from a front and placed at given intervals between edges of the tiled U-shaped web (22), the sides of the web (22) are subsequently closed to enclose. the particle material into a cylindrical rod, around which the cover is placed in a manner known per se (36) and that the coated rod is then cut into separate filters, all of which have eat at least one pocket (16) filled with particulate material (18). 2. A method according to claim 1, characterized in that particle material from a stock located in a feed hopper (k2) is measured on a feed and distribution wheel (6), after which the measured particle quantities (18) are transferred onto the flattened web (22). ). Method according to claim 2, characterized in that the measuring and distribution wheel (U6) receives the particulate material from the feed hopper one (U2) in the spaced periphery of the wheel (U6) of fixed volume (kk) and that the wheel (k6) is rotated. continuously, the measured amounts of particulate matter coming out of the feed hopper are placed at reciprocal intervals in the U-shaped interior of the web (22). k. A method according to claim 3, characterized in that the measured particle amounts of pockets (Hä) are kept in the pockets by means of a stop boot (U8) until they are deposited on the web. 5. A method according to claim 3, characterized in that the rotation of the wheel (k6) and the feed of the cover (36) and the web (22) are synchronized so that the peripheral speed of the wheel is approximately equal to the feed speed of the cover and the web. Method according to claim 3, characterized in that suction is used to facilitate the transfer of the particulate material (18) to the web (22). Apparatus for the manufacture of tobacco smoke filters, intended to carry out the process according to claim 1, characterized in that it comprises