DE1761709C3 - Method and device for the continuous production of a filter, in particular for cigarettes - Google Patents

Description

13. Device according to one of the claims

to 12, characterized in that the

fixed guide _{device (12 r} t2 ₂ ) fol- io

lowing driven rollers (13, 13,) each · The invention relates to a method and a

in the P ofil with an annular projection connected device for continuous and with large

can be seen, the to compress the mid-working speed taking place to manufacture a

leren area (F ₁ , A ₁ , F _1. A.,) of the filter strip filter, especially for cigarettes, from several

package and to define the curvature 15 fiber strips, which by laying one on top of the other to form a

axes (F ,, F.,) on both sides of the strip of combined materials together

Serve upright moving filter strip package. set to form a cylindrical

14. Device according to one of claims 8 filter body by two in a diameter plane to 13, characterized in that the fixed axes of curvature around after opposing Shells (15 ,, If.,) Is arched to form 20 set directions.

of the mutating area (F A F "/ f.) of the Fi! - Through the. Swiss patents 142 4 ^ 8,

strip packet symmetrical to the longitudinal axis 323 602 and 324 175 as well as the French patent

the device hinler the driven rollers font 1 145 669 filters are known in which a

(13 ,, 13th,) arranged-.ind. multi-layer filter strip made of a 1 racer

15. Device according to claim 14, characterized in that 25 layer and one or two with the carrier layer, that each shell mold (15 ,, 15,) firmly connected cover layers in a spiral around a level of the _{axes of curvature (F 1.} F.,) aii- a central axis is wound up od. a. such as an ordered bending edge (16, 16,), which is folded into a bellows or M-shaped, U-shaped or in ^ nsu-guidance of the filter strip packet on one of the ger form. The spiral formation of the bend in the middle area 30 of a coated filter strip is curved with a path corresponding to the package. however, of turns is difficult industrially

16. A device according to claim 14 or 15 to carry out and requires a cumbersome stove, characterized in that each Formschalc positioning device, the disturbances by binary rub (15, 15,) at the vertical distance from the bending of the strip and too tight winding of the same edge ( 16., 16.,) has a ramp (16. ,, 16 ₄ ). 35 is exposed. The filter material can also form the opposite edge for the bending edge of the respective opposite to the asymmetrical arrangement in the holder. cut not verzerrungsirei verlorml ^werücn ·

17. A device according to claim 16, characterized in that each tight spiral winding tends to be characterized in that between the bending edge of a filter strip, in particular of a rnehiscnitn- (16 " 16 ₂ ) and the gene edge (16, 16 ₄ ) of every ₄ ° ug filter, As a result of the elasticity of the same shell mold (15, 15,), a recess is provided for winding up after the strip has been arranged through which the bending of the filter strip packet has passed through a winding device. uic tes made possible without tension and friction. known folding of a multilayer filter structure.

18. Execution according to one of claims 8 fens necessarily results in mabis on the folded edges 17, characterized in that the material compressions and strains.

Driving and forming rollers (17, 18, 19) in pairs. It is also known from these patents

facing each other and each with an uncoated or single-layer Hlterstreitcn from

circular bending edge are provided, which in filter or crepe paper for the formation of cigarette

Height of the respective axis of curvature (F ₁ , F.,) filter to wrap spirally or to any one lies and to taiten for precise guidance of the filter strip 50 shape. Even in this way formed ni-

packet is used at certain points when winding or

19 Device according to claim 18, characterized by strongly compressed folds, whereby to

characterized in that the drive and form these points result in a different porosity than in the

roll (17, 18, 19) each with a filter cross-section remaining in the profile.

approximately semicircular, running along the circumference.

fenden fillets are provided, which with their rische patent specification 324 175 also known as, ins-

In the middle at the level of the bending edge of the counter roller, special cigarette filters made of several filter strips

lies and the arc rounding of roles fen to form that gctalte about a central axis

grows into a pair of roles. and then bent around two lateral axes

20. Device according to one of claims 8 60 are folded back in shape so far that their ends

to 19, characterized in that the at a peripheral point of the filter with more ode

Drive and form rollers (17, 18, 19) are each opposite with a smaller distance. Abge

an annular groove (14) for receiving one to see all of it that such a fold is difficult to do

If the drive belt (21) guided around the rollers is adjustable, the filter strips must have different see are <> 5 great lengths, but can still only s <

21 Device according to one of claims 8, that at the middle fold around

to 20, characterized in that between the ends of the filter tubes continuous Be

the drive and forming rollers (17, 18, 19) remain on rich reduced absorption.

It is also the subject of the earlier patent I 273 3 ° 7 a cigarette filter made of several filler strips, in which to improve the uniformity of the porosity and to simplify manufacture the filter strips in the form of an elongated filter strip package individually, loosely over one another and around two fixed in position, extending in the direction of the central axis of the filter Ki'ümimmgsachscn. those with the central axis in one Hegen plain and of which at least one runs in the escarpment from the central axis opposite lines are curved. In the filier of this earlier patent, with respect to the physical design of the filter largely fulfills the condition that a cigarette filler has an im should have the highest degree of regular and homogeneous structure so that the formation of passages, through which the smoke can pass more easily than through other filter parts, is avoided, d. H., that the filter should have a uniform porosity over its entire cross-sectional area and length. This homogeneity of the filter structure also determines the retention capacity of the filter the empty constituents of smoke in such a way that the better the homogeneity, the better These components settle more evenly at all points of the filter, because at high Homogeneity Passages or channels of greater permeability than other filter parts, due to the /. inevitably filter zones with different large filter performance can be avoided. The physical or geometric design of the filter according to the earlier patent does not only meet these porosity requirements and restraint, but also offers the Prerequisite for good mechanical and physical properties, such as a permanent cylindrical Shape and good density that help make the filter look good in making the cigarette and can be easily integrated with the rest of the cylindrical cigarette and when in use not deformed, d. H. due to the pressure of the lips of the smoker, no oval or otherwise takes flattened shape.

The invention is based on the task of a According to the earlier patent I 273 397 designed filter in a particularly advantageous manner continuously to be able to manufacture in such a way that the requirements given by the design of the filter for a uniform porosity, a large one Homogeneity, a good cylindrical shape and density also in the manufacture of each and every one of the Filters to be mass-produced are tested to be met.

According to the invention, the solution to this problem is with regard to the manufacturing process of the filter by cutting the strip into several narrow ribbons to make the filter, to form a filter strip packet whose axis of symmetry coincides with that of the filter and in which the different layers of material lie parallel and alternately next to one another; a small package consisting of layers is obtained, which is then assembled Package is simultaneously arched around two axes of curvature by deformation movements of small size, with a progressive cylindrical Filter body is formed in which first the middle area of the filter strip packet, then the intermediate areas adjoining the central area on both sides and finally those of both Deformed end areas graze. The method according to the invention ensures the formation of a dimensionally stable cylindrical filter body of extremely homogeneous structure, in which any pressure areas or the formation of cavities, which could lead to free passages for the smoke, avoided and that has a uniform porosity and a uniform retention capacity. Simultaneously is achieved by applying the invention a geometric structure through which all points of the filler cross section along the entire length of the filter due to the lack of angular folds and freer ones Passages are exposed to the same pressure.

A device with a number of devices which is particularly useful for carrying out the method for the motion drive as well as the guidance and shaping of the filter material results when these devices pass through one of the narrow filter belts on the combined strip vorzichncndc movable marking device, a fixedly arranged folding device, a movable Cutting device for cutting the combined strip into the narrow filler-ring strips, a fixed device for guiding and forming the fillet strip pack, driven Rollers to mark the axes of curvature, fixed mold shells to form the middle Area of the filter strip package as well as several drive and forming rollers for bending the subsequent areas of the filter strip package and finally through a conical shaped sleeve for Formation of the Filtenimfanges are formed.

The invention is based on the embodiments shown as examples in the drawing described. It show in a schematic representation

Figures 1 and 2 show an example of the method using three fiber strips of different materials Material,

3 of the strips according to FIGS. 1 and 2 strips formed from combined materials when folding.

Fig. 4 Filtcrstrcifen tapes, which by cutting open of the combined filter strip according to Fig. 3 can be obtained,

Fi g. 5 one made of upright filter strip tapes A layered filter strip packet formed according to FIG. 4,

F i g. 6 to 22 the individual work steps of the Process and the gradual formation of a cylindrical filter body of homogeneous structure,

23 shows the device used to carry out the method according to the invention in a diagrammatic view View and

F i g. 24 to 34 sections or perspective views showing details of the shaping of the material serving devices, from the formation of the combined filter strip to the geometric Arrangement of the material in the form of an S.

When using the method according to the invention, starting from strips of flat material continuous structure, a dense, cylindrical filter body with a specific location and design its components are formed by the mere geometric arrangement and shaping of the material. Here-

the material becomes with the formation of regularly changing, parallel and evenly spaced structures arranged narrow filter strip bands or cuffs and formed from these circular ones concentric windings processed into a filter body with an orderly, homogeneous structure, which ensures good utilization of the filtered properties of the material. The parallel filter hoop bands are used to form a filter strip package with an arrangement that is scientifically proven with regard to the best tightness is examined and in cross section a cylindrical filter body made of two opposite results in curved groups of turns, as can be seen from FIG.

This figure shows that the geometric guideline of the central filter strip band or ribbon passing through the axis of the filter forms an S. The two centers of curvature or Krümmungsachscn F ₁ and F ₂ , around which the winding group are arranged, so to speak represent the focal points of the figure the homogeneity of the filter structure would be disturbed.

So that all turns, as shown in FIG. 20, together form an exactly circular cross-section with the diameter of the filter, the size of the filter strip strips forming the turns is precisely determined. It was found that this is the only way to achieve an efficient arrangement which enables a well-filled filter body of uniform structure, circular cross-section and high filter capacity to be continuously produced from non-creped filter material. The basic geometric shape with the two centers of curvature or axes F ₁ and F ₂ is selected so that it can be used in all embodiments of the invention. FIGS. 20, 21 and 22 show several examples which differ from one another in the length of the winding arcs.

This length depends on the ratio of the width B of the filter strip bands (FIG. 6) and the size of the circumference of the filter or, which is the same, on the ratio of the thickness E of the winding groups or of the layered filter strip packet forming them depends on the diameter D of the filter. In the embodiment according to FIG. 20, this thickness is equal to a third of the filter diameter, ie D: E 3. In the slightly modified embodiment according to FIG. 21, which is more rolled up, the thickness E is slightly less than a third of the diameter D, and according to FIG. 22, which shows a somewhat less curled embodiment, the thickness E is greater than a third of the diameter D.

The filter shown in Fig. 20 is formed from three strips 1, 2 and 3 of fiber material (cf. Fi g. 1). The filter strips 1 and 2 consist of cell fiber wadding of known good absorption capacity, while the middle filter strip 3 consists of longitudinally profiled or longitudinally grooved paper.

These three filter strips are continuously unwound from winding drums and stacked on top of one another, so that according to FIG. 2 a combined layered strip is formed, one layer of which lies in the axis of the filter to be formed.

The symmetry of the material to the axis of the one to be manufactured The filter is retained in the shaping of the layered strip so that it will eventually to the intended, clv iil'alls to the filter axis symmetrical cross-sectional design of the filter leads.

The combined layered strip is now marked with longitudinal lines to prepare a fold and a later cut of the strip. The longitudinal marking lines also make it possible that when a fed strip is torn off, e.g. B. when changing roles, a new strip of fiber material introduced without stopping the manufacturing process can be.

The marked combined strip is then folded lengthways in accordance with FIG. 3 in the manner of a harmonica. This Longitudinal folding is carried out continuously up to one point when unrolling the combined strip which the angles at the apex of the folds are about 30. Then the folded is combined Cut the strips at the top and bottom fold lines 4 so that the narrow ones combined Filtcrstreifen-tapes or tapes 5 are produced, which are inclined according to FIG. 4 in the extension of the folds are. The number of fillet strips 5, which is seven in FIG. 4, is not relevant to the invention significant.

The mean width Ii (cf. FIG. 6) of the filter strip bands 5 is a function of the filler diameter and the size of the parameter or ratio /): E. Since in the example of FIG. 20 /): E equals 3, the mean width B of the filter strip bands5 must theoretically be equal to ³ U of the filter circumference, ie 1/4 Jt · D , so that a rectangle of width B and thickness E is one of the cross-sectional area

of the filter is the same area, ie an area of - · D ²

has.

If the mean width B of the filter strip tapes is precisely determined in this way and the number of filter strip tapes is determined, the width of the material strips used can also be precisely determined. Since, in the illustrated embodiment, the seven filter strip bands have an average width which is equal to three quarters of the circumference. so the width of the material strips used is also 5.25 times the length of the circumference (seven filter strip bands of ₁ /4.-7 result in 2V 1 = 5.25). The filter strip tapes can have approximately the same width among themselves.

To get an exactly circular cross-section of the

To ensure filters, however, the individual filter strip bands can have a slightly different width B. These differences can be identified by developing the geometric shape of FIG. 20 determined throw. In the example shown

game have the outer filter strip tapes 5 _t and 5 ₂ (Fig. 6) a width that is slightly less than the average width.

The cut filter strip tapes 5 now throw against each other vertically or on edge placed to a filter strip package according to F i g. 5 to form. This contains a number of filter layers that are equal to the product of the number of strips used and the number of filter strips

309 638/245

Bander, ie 3-7-21 in the example shown. When the filter strips are pressed together to form the packet of filter strips according to FIG. 5, some of the filter strips can be combined with their neighboring filter strip strips and their independent mobility for the later molding process, in which the filter strips have a certain sliding movement run against each other, lose. Thus, in the illustrated embodiment, the cotton tires can be connected to one another in pairs. The Malcrial layers, which retain their independent mobility when the filter is formed, are therefore formed by one or two of the original layers. In the example according to FIG eight layers of cotton wool, namely the two single-ply outer layers 5, 5 and 5, and six double layers 5 _{5 are} formed, between which there are seven layers of longitudinally creased paper 3.

In Fig. Ft is the filter strip package after the upright standing filter strip tapes are placed on top of each other and the formation of the various layers.

To shape the filter while forming the two groups of turns with the two centers of curvature or axes F ₁ and F ₂ , these two axes of curvature are first determined by placing on each of the two side surfaces or outer sides S ₁ and 5 of the filler strip package symmetrically to the axis " On one side, the center of curvature or the _{axis of curvature F 1 is} above the axis

au J - ^ - E j γ ι α c * at a distance ₄ and on the other side the other center of curvature or the other _{axis of curvature F., marked symmetrically to F 1} with respect to the axis. Here, according to FIG. 7, the filter _{strip packet C 1} , B ₁ , C ₂ , B _{1 is} compressed in its central area F ₁ , A ₁ , F. " A., to the thickness E that it should have in the finished filter.

This central area is then formed first. This shaping is achieved by a symmetrical, reciprocal displacement movement of the elements shown in FIG. 7 and S upper and lower parts C ₁ , B ₁ , F ₁ , A ₁ and C. “/?.,. A. "F., of the filter strip packet brought about, each at the level of the axes of curvature F ₁ and / ·., In the direction of the arrows T ₁ and 7 ', (Fig. 8) under Ab ^: bend the middle area F ₁ , A ₁ , F ,, A., are shifted against each other. The displacement movement has an effective vertical component in the sense of bringing the upper and lower part or the front ends O ₁ and 6, of the filter strip packet closer together, which is effective in terms of the distance between the two parts and a mutual longitudinal displacement of the filter tire strips is accompanied. The vertical approach of the two parts is accompanied by a lateral bending of the various layers of the filter strip packet and is used to bring about a favorable separation in the mutual arrangement of the individual layers of the packet according to FIGS. The lateral movement apart bends these layers, reinforcing their lateral bend around the connecting line of the axes of curvature F ₁ , F ₀ with two oppositely directed curvatures. In the sliding movement, the two curves are accentuated, whereby the line connecting F ₁ -F., Rotates about the axis to the vertical position shown in FIG. 9 and the mutual distance of the axes of curvature of F ₁ and F, to the to the thickness E Filter strip package reduced.

The middle, originally rectangular area F ₁ , A ₁ , A. "F., takes the form of two inverted quarter-circle cross-sections F ₁ , /)." F., and F ₁ , A ₁ , F., with the common radius E , which passes through the axes F ₁ and F., and is formed by the connecting line F ₁ -F. (cf. FIGS. 9 and 11). The area of the two circles is equal to the area of the original rectangle F ₁ . A ₁ , F ₂ , A., the fin. 7, ie that the material has undergone its final compression with the original compression of the packet of film strips as shown in FIG. At the end of the bending movement forming the two quarter circles, the basic shape of the final S-shaped geometric line of the central filter strip ribbon is formed in the central area.

Now, according to FIGS. 12 to 14, the _{areas of the filter strip packet immediately adjoining the central area F 1} , A ₁ , F. "A" on both sides are bent around the axes of curvature F ₁ and F ₂ by 90 ^{r <} . This bending takes place in several processes. In the embodiment shown, three bending processes of 30 "each are carried out, so that first a bend of 30" as shown in FIG. 12, then a bend totaling 60 ° as shown in FIG. 13 and finally a bend totaling 90 ° as shown in FIG arises. The respective bending of the two parts of the filter ^{strip package by 90} ° ⁱⁿ opposite directions is possible. , j ^ _we -, _{the e} j _{nzclncn layers of the package when bent move} against each other while performing a sliding movement, this sliding movement being promoted by the fact that a layer of longitudinally grooved material, such as paper, is arranged between the layers made of wadding, which does not combine with the cotton wool.

At the end of the bending process, the two hand areas T ₁ and 7 _{2 of} the filter strip package are folded over so that they are directed in opposite directions as shown in FIG and form, for example, two semicircles F ₁ -F., - A., and Fr ^F \ ^A i , shifted relative to one another, the centers of which according to "Fi" g. 14 lie on the axes of curvature F ₁ and F ₂ and their radius is equal to the thickness Έ of the filter strip packet. The geometric guideline of the middle filter strip ribbon has assumed the final shape of a symmetrical S in this process step.

In FIGS. 9, 12, 13 and 14, the layers of the filter strip package are indicated by solid lines only in the areas mentioned. However, these layers go through to both ends of the filter strip package. The lined areas show the progress of the formation of the for each figure. middle area and the two subsequent areas.

As a result of the sliding or bending movement of the layers of the filter strip package, the two take Ends of the filter strip packet when they are completely bent over, which can be seen in FIGS. 15 to 17, each with a sloping surface tapering shape.

Through this, the subsequent process of hemming formation of the filter by winding the ends of the individual layers onto the two semicircular regions of FIG. 14 prepared. This last process step is carried out by symmetrically folding over one of the layers at both edge ends of the filter strip packet Ivw. by winding up the two hand areas 7, and 7_, in the same winding direction on the two Halhkivis-O.ierschniUsfliiehen / ', -) ■'., - A., and F 15 to 17 and in an enlarged view from FIGS. 15 to 22 carried out.

According to the invention, a device is used to carry out the explained process steps of which a preferred embodiment is shown in FIGS. 23 to 34 is shown as an example,

For the production of the cigarette filters, this device processes, as has already been mentioned in connection with the method, a plurality of strips of material precisely determined in terms of their width as a function of the filament diameter. / .. B. So two strips I and 2 made of Zcllfascrwatte and a strip of longitudinally grooved paper 3, which are continuously unwound from corresponding drums or spools according to FIG. 23. The strips 1, 2 and 3 are, as shown on the right hand window of Fig. 23, combined or combined lying on top of one another and run together through a marking device 8, 8, which in the example shown through two groups of rotatable pressure disks 8, and 8. The rotatable pressure disks sit on axes arranged on both sides of the combined strip 1, 2, 3 and rest on the upper and lower surfaces of the combined strip 1, 2. 3 lines running in the longitudinal direction to mark, which form fold lines 4 and prepare the later division of the combined strip into the narrow filter strips or ribbons 5 and, on the other hand, at the same time to drive the combined strip.

The marking _{device S 1} and 8 is followed by a fixedly arranged folding device 9, to 9,, which by a group of folding blades 9, which converge in the direction of movement of the combined strip. 9. ,, 9., and 9, ^ is formed. The number of folding blades depends on the Aah'i of the filter hoop bands to be formed. The drop blades are arranged on both sides of the combined strip 1, 2, 3 as shown in FIG. 24 and gradually engage further so that they act simultaneously on both sides of the combined strip in such a way that, as shown in FIG. 25, a uniform and regular, accordion-like fold arises, the upper and lower fold lines 4 of which are located exactly on the lines initially defined by the marking device 8 and 8 ₂ (cf. also FIG. 24).

Behind the folding device 9 to 9 ₄ is a cutting device made up of upper and lower thin knife disks 10, 10 _s and 10, which rotate at high speed and the folded combined strips 1, 2, 3 according to FIG. 26 at the fold lines 4 cut into the narrow filter strip tapes 5. These filter strip tapes 5 are then upright with the help of two lateral guide strips 12 and 12 ₃ , which converge somewhat according to FIG 12th, certain pressure summarized. Driven rollers 13 and 13 are arranged behind the guide strips, which mark or define the axes of curvature F ₁ and / · ". For this purpose, rollers 13 and 13 are in the profile according to FIG. 28 each provided with a ring-shaped projection, which can be easily inserted from both sides into the side surfaces of the Filterstreil'enpakele *.

ίο press in.

The driven rollers 13 and 13 form a first pair of rollers, which is followed by a fixed bending device consisting of two fixed mold shells 15 and 15 arranged symmetrically to the longitudinal axis of the interior fittings. Each of these molded shells has at the level of the respective curvature axis F, and / ■ '., A projecting bending edge 16, or 16, and a ramp or counter edge 16, or 16, at the level of the edge of the symmetrical opposite ends Open the mold (vszl. Figs. 29 and 30). The mutual distance between the two shell molds 15 and 15 is chosen so that a passage for the implementation of the upper and lower part of the in Fig. 30! There is a filter strip in the mutual displacement of these parts. The bending edges and crossbars are curved according to the path of this movement. Each molded shell is / between its bending edge 16, or 16, and its opposite edge 16. or 16, provided with such a recess that the bending area of the filter strip packet can be formed without external tension and friction.

The fixed bending device 15, 15, is followed by several drive and forming rollers 17, 18 and 19, which according to FIG. 23, 31, 32 and 33 lie opposite one another in pairs and are arranged symmetrically to the axis of the filter for each pair of rollers. Each of these drive and form rollers is given away on the circumference with a circular bending edge and an approximately semicircular groove in profile, which is exactly opposite the center of the bar edge of the opposite roller and whose radius is equal to the thickness E of the respectively shaped part of the filter strip packet, such '(' - if this is guided at the same time as the axes of curvature F, and F., while passing between the bending edges and flutes of the driven roller pairs, while maintaining its previously imparted shape Curvature and also bends in the passage between the rollers of a respective pair of rollers to the extent that the arc of the flutes pass the arc of curvature of the material formed before the passage.

In the embodiment shown, the Arc rounding of the flutes of the driven rollers of the first roller pair 120, the one stepping filter strip package already bent to 90 "' is bent by 3fP during the passage. The respective arches of the fillets of the second and the third pair of rollers are 150 or 180 ", so that the final bend of the filter strip package takes place in three stages. The mode of action of the roller pairs shown in Figs results from FIG. 12 already explained until 14.

Between the pairs of rollers, the guide of the first tire package at the level of the axes of curvature Fj and F ₂ is secured by fixed guide edges 20, which according to FIG. 23 are arranged on each side of the film strip packet. The movement drive for the passage of the filter strip packet for its shaping or bending is carried out by the rollers 17, 18 and 19 with the aid of drive belts 21 which engage in annular grooves 14 on the circumference of the drive and shaping rollers.

For spiral winding of the end parts 7 and 7 of the filter strip packet and for formation of a filter plug or body of circular cross-section, the filter strip packet goes with the Passage obtained through the last roles 19

Shape by a coaxial with the axis of the filter conical shaped sleeve 22 through which inner? Taper is such that its diameter at the outlet end is equal to the diameter of the finished filter. The conical Fonnhülse 22 runs with a Speed around, which is chosen such that the line connecting the points of the axis of curvature only slightly deviates from the vertical and torsion stresses in the filter body are avoided the application of the conical form sleeve 22 is obtained the filter body can be seen e.g. from Fig. 20, circular cross-section with the end edges of the individual filleting strips of the filter strip pack lie on an exactly cylindrical circumference.

For this purpose 4 sheets of drawings

Claims (12)

Patent claims: 1. A method for the continuous and high-speed production of a filter, especially for cigarettes, from several fiber strips which are put together to form a strip of combined materials which, to form a cylindrical filter body, follows two axes of curvature lying in one diameter plane is curved in opposite directions, characterized in that, to manufacture the filter, the strip is cut into several narrow bands in order to form a filter strip packet whose axis of symmetry coincides with that of the filter and in which the various maierial layers lie parallel and alternately against one another; to obtain a layered ao standing package loading of small width, after which this composite packet simultaneously about two axes of curvature less by deformation movements size is curved, wherein progressively a cylindrical filter body is formed, in which first the central area of the filter strip package, then at the mutually the intermediate area adjoining the middle area and finally the two end areas are deformed. 2. The method according to claim 1, characterized in that on the two side surfaces of the filter strip packet (C, - / J ₁ -CB.,) Marked two to the longitudinal axis> e of the same symmetrically extending indentation points and thereby the two axes of curvature (F _V F., ) can be set. 3. The method according to claim 1 or 2, characterized in that the originally rectangular central area (Γ ,, A ₁ , A. " F.,) of the filter strip packet (C ₁ -B ₁ -C ₂ -S ₂ ) by gradually advancing Bending to two inverted quadrant cross-sectional areas (F ₁ , A., F ₂ and F ₁ , A ₁ , F ₂ ) with a common radius connecting the two axes of curvature (F _1, F ₅ ) are deformed. 4. The method according to Anspruoh 3, characterized in that the gradually progressive bending of the central area (F ₁ , A _v A. "F.,) of the filter _{strip package (C 1} -B ₁ -C ₂ -B ₂ ) through a to the longitudinal axis the same symmetrical double displacement movement is brought about, by which the TeUe located on both sides of the central area (C ₁ -B ₁ -F ₁ -Zl ₁ and C ₂ -B ₂ -F _{2 -Zl 2} ) of the filter strip packet with bending of the same in the direction of the longitudinal axis are approached and removed from one another in the direction transverse to this. 5. The method according to claim 4, characterized in that the mutual distance between the two axes of curvature (F ₁ , F,) is reduced when performing the displacement movement to the thickness of the filter strip packet in the finished filter. 6. The method according to one of the claims 3bis5, characterized in that the deformation of the intermediate areas directly adjoining the central area (F ₁ , A ₁ , A _v F ₂ ) of the filter _{strip packet (C 1} -B ₁ -C ₂ -B ₂ ) is carried out Gradual bending around the two quarter-circle cross-sectional areas (F ₁ , A ,, F., and F ₁ -A ₁ - F ₂ ) until two semicircular cross-sectional areas symmetrical to the axis of the filter are formed (F ₁ -F., - / !., and F ₁ -F ₁ -Zl ₁ ) is brought about. 7. The method according to claim 6, characterized in that the two end regions (7 _t , 7 ₂ ) of the filter _{strip packet (C 1} -B ₁ -C-Bj) to form an approximately cylindrical circumferential surface with the same winding direction spirally onto the semicircular cross-sectional areas ( F ₁ -F ₂ -Zl ₂ and F ₂ -F ₁ -Zl ₁ ) are wound up. 8. Device for performing the method according to one of the preceding claims with a number of devices for the movement drive and the guidance and shaping of the filter maieriais, characterized in that these devices are connected to the combined strip (1 , 2, 3) movable marking device (8, 8,), a stationary folding device (9, to 9 ₄ ), a movable cutting _{device (1O 1} to 1O ₃ ) for cutting the combined strip into the narrow filter strips , a fixed device (12, 12 ₂ ) for guiding and forming the filter st; egg package, driven rollers (13p 13 ₂ ) to mark the _{axes of curvature (F 1} , F ₂ ), fixed mold shells (15 ,, 15.0 to form the middle area (F ₁ , zl _p F ₂ , zl ₂ ) of the filter strip package as well as several Drive and shaping rollers (17, 18, 19) for bending the adjoining areas of the filter strip packet and finally by a conical shaping sleeve (22) for forming the filter circumference. 9. Device according to claim 8, characterized in that the movable marking device (8 ,, 8 ₂ ) consists of rotatable disks which sit on both sides of the combined strip (1, 2, 3) arranged axes and on the upper and lower surface of this The strip to mark the fold lines of the strip and to drive the strip at the same time. 10. Device according to claims or 9, characterized in that the stationary folding device (9, to 9 ₄ ) by in the upper and the lower side of the combined strip (1, 2, 3) arranged, in the direction of movement of the strip converging folding blades ( 9 _p 9. ,, 9. ,, 9 ₄ ) is formed, the folding edges of which overlap and rest against the _{lines marked by the marking device (8 ,, 8 2} ) on both sides of the strip in order to fold it like a harmonica. 11. Device according to one of claims 8 to 10, characterized in that the cutting _{device (1O 1} to IO3) by on the top and bottom of the folded combined strip (1, 2, 3) arranged thin knife disks (1O ₁ , HO ₂ , 1O ₃ ) is formed, which can be driven at high speed and separate the strip at the upper and lower folding edges (4) in the longitudinal direction to the narrow filter strip bands (5). 12. Device according to one of claims 8 to 11, characterized in that the fixed standing device (12 ^ 12.,) for guiding and each side of the bent filter strip packet Formation of the filter strip package from the high or the resultant filter body in Kant incoming Filterstreiien bands (5) height of the respective axis of curvature (t _{v r;,)} through two guide edges (20) on both sides of the filter strip package for continuous arranged in the direction of movement of the filter body are arranged ben converging guide strips (12, 12J
■ is formed.