DE2556332A1 - Production of double walled paper tubes for cigarettes - paper band is folded and formed into tube - Google Patents

Abstract

Method for the manufacture of a multi-walled paper tube which can be cut into mouthpieces for cigarettes distinguished by a band which is wider than twice the circumference of the tube to be produced. A continuously running band is longitudinally folded together and formed into a tube. The fold is formed by weakening the band through perforation. a machine for the above method has a continuous paper band feed (1, 2, 3, 4), a weakening device (14), a folding arrangement (37) and a forming unit (38). The weakening device (14) consists of a perforating arrangement with a perforating knife (16).

Description

Stw .: Papyrosi pipe production-extrusion process-erg. I procedure and Machine for the production of a multi-walled paper tube for smoking article mouthpiece tubes The invention relates to a method for producing a multi-walled paper tube, from the mouthpiece sleeves for rod-shaped smoking articles are cut off.

The invention also relates to a machine for making a multi-walled paper tube, from which mouthpiece sleeves by means of a cutting device be cut off for stick-shaped smoking articles.

Multi-walled paper tubes of the type mentioned above are commonly used manufactured in such a way that a number of paper strips corresponding to the wall number is fed, these tears also by cutting a wide strip can be formed, and formed a tube by superimposing these strips will. Here, a not inconsiderable effort has to be made for guiding the strips because they occupy very specific positions in relation to each other. Also is the actual molding equipment is relatively complicated because not all strips are Stw .: Papyrosis tube production-strand processing-erg. I formed one on top of the other together can be, but to make the overlap of each strip in the desired Kind to get a strip over the pre-formed or already finished other Strip is formed.

The invention is based on the object of multi-walled paper tubes for the Iierstellung of mouthpiece sleeves to be produced in a manner that is as inexpensive as possible.

This object is achieved according to the invention in that a continuous Paper strips, the width of which is at least twice the circumference of the manufacture Tube corresponds, is continuously withdrawn from a tube that the strip in the longitudinal direction is provided by weakening with a fold line through which the strip is divided in two Strip sections is divided that the two strip sections along the Fold line are folded up, and that the folded strip into one double-walled tube is formed.

After folding the paper strip, it should run along the fold If possible, contain no restoring forces, i.e. it must be along the fold line be weakened as much as possible. This is according to a further feature of the invention achieved by the fact that the strip is weakened by perforation and thus a fold line is formed.

Starting from the above-described basic principle of the invention, this can Tube can be shaped in different ways.

Another feature of the invention is characterized in that that the paper strip is wider than twice the circumference of the one to be produced Rohres that the fold line produced by weakening the StreiSIs to a Stw .: Papyrosi pipe production-strand process-erg. I edge the strip a distance approximately corresponding to the circumference of the pipe to be produced, so that a narrower and a wider strip section can be formed, and that the folded one Strip is shaped into a double-walled tube that the edge of the narrower Strip section ends in front of the folded edge. Either the folded Strips are formed into a double-walled tube that the wider strip section the outer wall of the tube forms and the folded edge overlaps, or the folded edge Strip is formed into a double-walled tube in such a way that the wider strip section forms the inner wall of the pipe and the folded edge overlaps the inner wall. on the other hand According to another feature of the invention, the paper strip can be used for molding can also be prepared for a double-walled pipe in such a way that in the case of a strip, which is wider than twice the circumference of the pipe to be produced, which is caused by weaknesses of the strip made one fold line to both edges of the strip Has a distance that is greater than the circumference of the inner wall of the to be produced Pipe. Such a folded strip can then be formed into a tube be shaped so that the edge of the inner strip section overlaps the folded edge, or such that the folded edge overlaps the edge of the inner strip section. To the restoring forces of the paper in the range de; After forming the seam into a tube to keep it as small as possible, i.e. to obtain a pipe that is as round as possible in a further embodiment of the invention, the strip prior to deformation to form a tube on either side of the fold line in opposite directions Stw .: Papyrossirohrste lung-strand verfai en-erg. I directions pre-folded. Will serve the same purpose as well the strip in a further embodiment of the invention in the area of the edge of the strip section pre-folded, which forms the overlap after the pipe has been formed. An other suggestion to reduce the restoring forces of the paper in the area of the fold provides that the strip is weakened on both sides of the fold line. If required, According to a further characteristic of the invention, the strip can also be in the area the edge of the strip section will be weakened after forming the pipe forms the overlap. The tire that ripens in this way can be weakened by perforation in the longitudinal direction will. The strip should weaken the overlap area evenly be perforated in such a way that after completion of the tube 5, the perforations are offset from one another in the individual paper layers. To fix the pipe, the strip is scimilted off, which forms the overlap after it has been formed into a tube, on one edge with one. Adhesive provided. Mouthpiece sleeves that attach to cigarettes are set, should have an abutment for the tobacco rod, so none Tobacco particles get into the mouth or even into the respiratory tract of the smoker when smoking can. It reduces the amount of work involved in producing such abutments to incorporate the sleeves into them.

Another feature of the invention si.ht therefore that the Strip section which forms the inner wall of the tube after it has been formed, such is provided with incisions that tabs arise from the plane of the stripes be bent out. Mouthpiece sleeves should not stand out from the outside if possible differentiate between the cigarette wrapping.

For this purpose, it can be useful, the endless tube produced with a to wrap another strip of paper. This may also be required in order to To give the pipe the desired strength. Appropriately, is the second Stw .: Papyrosis pipe production-strand process-erg. I strips of paper a strip of cigarette paper used, which is thinner than the paper strip from which the double-walled tube is made will be produced. The adhesive seam of the second strip of paper should be tied tightly be when the pipe emerges from the format of the machine, especially when it comes out of the first double-walled tube made of paper no or no tied has cut seam. This condition is made in a particularly clean and safe way met when, according to a further feature of the invention, at an edge of the second A hot melt adhesive is applied to the paper strip, and after wrapping the Tube a glue seam of the overlapping paper strip is solidified by cooling. The pipe becomes particularly dimensionally stable, especially for one during further processing taking place the rolling process cut from the pipe. Mouthpiece sleeves, albeit in this type of pipe production on the paper strip from which the double-walled Tube is formed, a glue is applied to one edge, expediently a cold glue w- d. In order to make the manufactured pipe dimensionally stable, it may be advisable to to heat the pipe produced after shaping and, if necessary, to moisten it beforehand.

The machine mentioned at the beginning, which is used in particular to perform the above-described The process is used, is gekennzeich.et by a carrier for a roll of paper strips and pull-off means for continuously pulling off a paper strip from the roll Weakening means for providing the paper strip with the fold line, a folding device for folding up the paper strip along the fold line and a forming device to form a double-walled tube from the folded strip. Stw .: Papyrosis tube production-Stripping process I A particularly strong weakening of the paper strip for producing a fold line is according to a further feature of the invention by a perforating device with a rotating perforating knife achieved.

To produce a dimensionally stable pipe, another Markings. the invention uses a paper strip that is wider than double The scope of the pipe to be produced is. This strip of paper is used to manufacture of the desired pipe cross-section so guided to the perforating device that the Fold line introduced into this at a distance from an edge of the paper strip which corresponds approximately to the circumference of the pipe to be produced. The deformation the folded paper strip 5 becomes a round tube according to a further characteristic of the invention by a folding device for pre-folding the paper strip to both Easier sides of the fold line in opposite directions. Appropriately the folding device is also designed for pre-folding an edge of the paper strip. The production of a round tube can also be done by means of weakening of the paper strip on both sides of the fold line. Here too is also expediently a means of weakening the paper strip in the Area of the edge forming the overlap is provided. As a means of weakening of the paper strip can be a perforating device with rotating perforating knives be used. An application device is used to fix the pipe in its shape intended for applying glue to the paper strip. To form abutments, after attaching the mouthpiece sleeves made from the tube to Tal-akartikel to prevent an Ansauyen of tobacco is in Stw .: Papyrosi pipe production-extrusion process-erg. Another embodiment of the invention is a continuously rotating cutting and folding device intended for forming and folding flaps in the strip. The machine can with another carrier for a second roll of paper strip, with extraction means for continuous removal of a second strip from the roll as well as one of the former Molding device downstream of the second molding device for wrapping the double-walled pipe with the second strip. Here is after another Feature of the invention is a second application device for applying a hot melt adhesive onto an edge of the second paper strip and one of the second forming devices Associated cooling device for an adhesive seam of the second formed by overlapping Paper strip provided.

In this machine version, the one assigned to the first paper strip Application device designed for applying a cold glue. Furthermore can a heating chamber and possibly an upstream humidity chamber of the cutting device of Be upstream of the machine.

llin tubular mouthpiece for a rod-shaped tobacco holder Smoking articles, which in a particularly economical way, especially after the = experienced and manufactured on a simple machine according to the invention, is characterized in that the tubular mouthpiece is double-walled and both walls are parts of a folded strip of paper, its Long edges end in the area of the folded edge.

The mouthpiece can be designed such that the longitudinal edge of a The wall in front of the folding edge ends and the long edge of the other wall ends with the folding edge forms an overlap, the overlap being glued. It can do it Stw .: Papyrosis pipe production-strand process-erg. I either the outer wall the folding edge overlap, or the folding edge can overlap the inner wall. With a different mouthpiece design the inner wall and outer wall overlap the folding edge, and in another variant the outer wall overlaps the folding edge and this in turn overlaps the inner wall. Further Variants of the mouthpiece sleeves described above arise when they are from a thin paper wrapping with overlapping, glued longitudinal edges are enclosed.

Stw .: Papyrosi pipe production-Strngverfahren-Erg. I The invention is explained in more detail with reference to the drawings representing the exemplary embodiments. It show: FIG. 1 a schematic view of a machine for producing mouthpiece sleeves, FIG. 2 shows a folding device of the machine of FIG. 1 on an enlarged scale Section, FIG. 3 shows a detail of a perforating knife of the machine in FIG. 1 in May increased; st, FIG. 4 shows a section of a cutting and folding device the machine of Figure 1 on an enlarged scale, Figure 5 shows a deformation of a Paper strip, as it is done in the machine of Figure 1, Figure 6 is a front view a mouthpiece sleeve, Figure 7 a variant of the machine of Figure 1 in a cutout, FIG. 8 shows a further variant of the machine of FIG. 1 in a section, FIG 9 shows a further variant of the machine of FIG. 1, FIG. 10 in a side view a section of a perforating device of the machine of Figure 9 Figure 11 a Front view of a mouthpiece sleeve produced on the machine of FIG. 9, FIG 12 shows a detail of the mouthpiece sleeve in FIG. 11 on an enlarged scale, FIG 13 overlapping variants for the shapes up to 15 Stw .: Papyrosi pipe production-extrusion process-erg. I of mouthpiece sleeves in the strand process, Figure 16 a mandrel in section. Stw .: Ppyrosipipe production-strand process-erg. I The machine of Figure 1 has a Support in the form of a bobbin storage 1 for a paper strip roll 2, the more than twice as wide as the circumference of the paper tube to be produced. A strip of paper 3 is of a take-off means in the form of a pair of rollers that can be driven by the machine drive 4 can be pulled off the roll of paper strip 2. A folding device 6 for pre-folding of the paper strip 3 is shown in Figure 2 and consists of a lower part 7 and an upper part 8, which limit a guide 9 between them, which is approximately in the middle two bends 11 and 12 in opposite directions and one on one side Has curvature 13 for one edge of the paper strip 3. A debilitating agent in the form of a perforating device 14 consists of a circular, circumferential Perforating knife 16, a section of which is shown enlarged in FIG. 3, and a cutting roller 17. Between two deflection rollers 18 and 19 is an application device arranged for adhesive in the form of a glue nozzle 21, which via a line 22 by means of eir pump 23 is fed by a glue supply 24. A cutting and bending device 26 consists of two revolving rollers 27 and 28, of which roller 27 is in the area of the adhesive applied to the paper strip 3 has a recess. The rollers 27 and 28 each contain two disks 29 and 31, which are cut out are shown in FIG. The disks 29 have teeth arranged in pairs 32a, 32b with cutting edges 33a and 33b, respectively. The discs 31 have a corresponding Number of recesses 34a, 34b in pairs with cutting edges 36a and 36b, respectively. A folding device a deflection roller 37 is provided for folding the paper strip 3 together. A forming device 38 for Stw .: Papyrosi pipe production-extrusion process-erg. I forming a tube from the pap; 3 consists of a pre-format 39 for Pre-bending of the paper strip 3 and a main format 41 for the final shaping of a Paper tube 42. Through the main format 41 is a drum 43 drivable Format tape 44 out, which wraps around the paper strip 3 and it through the Format 41 pulls or the paper tube 1 under a seam plate 47 through a cutting device 48 feeds. Downstream of the cutting device 48 is an acceleration device 49 in the form of a driven pair of disks and a single drum 51.

In FIG. 5, 3 denotes the paper strip, and 52 denotes one by perforating formed fold line, which the paper strip 3 in a narrower strip section 3a and a wider strip section 3b divided, with 53 an adhesive strip, denoted by 54a, 54b incisions and by 56a, 56b tabs. At 57 the glue seam is of the finished paper tube 42 denoted.

Operation of the machine according to Figures 1 to 6: From the pair of rollers 4, the paper strip 3 is continuously withdrawn from the paper strip roll 2 and guided through the folding device 6. Here he gets a little off-center, more precisely, on both sides of the subsequently marked Fa "1, never in the curvatures 11 and 12 of the guide 9 and pre-folded at its one edge in the curvature 13. The perforating device 14 perforates the paper strip with its perforating knife 16 3 and thereby forms the fold line 52. The adhesive strip is removed from the glue nozzle 21 53 is applied to the paper strip 3 in the area of the pre-folded edge. The cutting and Bender 26 cuts with teeth 32a Stw .: Papyiossipipe production-extrusion process -Erg. I and 32b of their disks 29 with the assistance of the disks 31 recess n 54a and 54b in the narrower strip section 3a of the paper strip, whereby Tabs 56a and 56b are formed, which take place simultaneously with the cutting process of The teeth 32a and 32b are bent into the recesses 34a and 34b of the discs 31 will.

With the IJmlenke.l around the pulley 37, the narrower strip section becomes 3a placed on the wider strip section Fb, where the folded paper strip was 3 with the pulling through the pre-format 39 and the main format 41 to a paper tube 42 is formed. The adhesive seam 57 is heated by the seam plate, as a result of which it solidifies will. The paper tube 42 is predetermined by the knife device 48 in mouthpiece sleeves 58 Length, which is detected by the acceleration device 49 iind accelerated are conveyed in troughs of the push-in drum 51, which they move in the transverse axial direction promotes.

Figure 7 shows a variant of the machine according to Figure 1, in which parts, which correspond to those of FIG. 1, with the same reference numerals, increased around 100, and are not explained again.

The machine according to Figure 6 differs from the machine of Figure 1 in that between the seam plate 147 and the cutting device 148 another forming device in the form of a format 161 with one of the drum 162 drivable format belt 163, a seam plate 164, a pull-off means in the form of a Pull-off roller pair 165 for pulling off a paper strip 166 from a paper reel 167, which on a carrier in the form of a bobbin Stw .: Papyrosi pipe production-extrusion process-erg. I storage 168 is stored, as well as a gluing device 169 for gluing a Ka, lte of the paper strip 166 are provided.

How this machine works, as far as it differs from the machine's Figure 1 distinguishes: The paper tube 142 is in the format 161 by means of the format tape 163 wrapped with the paper strip 166 glued on one edge, whereupon the adhesive seam is dried from the suture plate 164. The wrapped paper tube 142 'is of of the cutting device 148 divided into mouthpiece sleeves 158 '.

Figure 8 shows a variant of the machine of Figure 1, in which parts, which correspond to those of FIG. 1, with the same reference numerals, increased around 200, are provided and not explained again.

The machine according to FIG. 7 differs from the machine in FIG Figure 1 in that between the seam plate 242 and the cutting device 248 a humidity chamber 271, which has a steam space 272, via a line 273 fed by a steam generator 274, and a heating chamber 275, e.g. can be heated, are provided.

In the steam space 272, the paper tube 272 is driven by the supplied steam illuminated and then dried in the heating chamber 275. This is supposed to Paper tube 242 can be made durable in its desired shape.

In the variant of the machine according to FIG. 9, there are parts that also indicate 1 and 7 correspond, with the same reference numerals, increased by 300 and 200, respectively, and will not be explained again.

Stw .: Papyross pipe production-strand process: rg. I The on the Machine of Figure 9 manufactured mouthpiece sleeves correspond in their structure to that in Figures 11 and 12 end view shown. Different from the machine of the In the machine of FIG. 9, FIG. 1 is a weakening means for the pair of rollers 304 376 downstream, which not only for providing the paper strip 303 with a Fold line 352, but also to weaken the paper strip 303 on both sides the fold line 352 as well as in the area of the edge, which after the forming of the pipe the Forms overlap, is designed. The weakening means 376 consists of one Perforating knife roller 377 with four circular perforating knives 378, 379, 381, 382 and a cutting roller 383.

The perforating knife 381 cuts the score line 352, and the perforating knives 378, 379, 382 cut lines of weakness 384, 386, 387 in the paper strip 303, which are arranged to the fold line 352 that after completion of the pipe 92 the lines of weakness (perforations) 384, 386, 387 in the individual paper layers 303a, 303b, 303b are offset from one another (see Figure 12). Such a weakening is particularly appropriate for relatively hard and stiff paper, the folding device 306 may be omitted. In the case of easily deformable paper, on the other hand, the folding device is sufficient 306 and an embodiment of the weakening means corresponding to that based on the figure 1 described. Otherwise, the paper strip 303 is treated the same as that in the machine of Figure 1, with the edge of the strip section 303b Cold glue strip is applied by means of the glue nozzle 321. A polyvinyl acetate glue can be used here be used. After the paper tube 342 has been formed in the main format 341, the Adhesive seam not through a Stw .: Papyrosis tube production-strand process en-erg. I Seam plate solidifies, but binds after wrapping the paper tube 342 with the paper strip 366 which is thinner than the paper strip 303 and e.g. can be a Zigc! the consequently, precise calibration of the paper tube 342 only takes place when it is wrapped the paper strip 366 in format 351. The Kli.beamt ues paper strip 366 must however, after exiting the 361 format it will be fixed. The adhesive is therefore a Hot melt adhesive used, which is made from a heated glue pot 388 by means of a Dosing pump 389 and an application nozzle 391 applied to the paper strip 366 will. The format 361 has a cooling device at its exit to bind the adhesive seam 392, which consists essentially of a cooled web, under which the adhesive seam slides along. Such a cooling device is, for example, in the German Offenlegungsschrift 2,159,751 shown. The cooling device 392 is via lines 393, 394 with a Cooling unit 396 connected, which constantly cold water through the cooling device 392 pumps.

Figure 11 shows an end view of one on the machine of the figure 9 manufactured mouthpiece sleeve 358 '. In the enlarged section shown in FIG The paper strip 366 has been omitted from the mouthpiece sleeve according to FIG. At this The outer strip section 303b overlaps the folded edge 352 with the mouthpiece sleeve he is glued, while the inner strip section 303a in front of the folded edge 352 ends.

A variant of the overlap is shown in FIG. 13, in which the inner strip section 403a under the fold edge Stw .: Papyrosi pipe production I 452 comes to rest. Gluing also expediently takes place here. Of the outer strip portion 403b ends before the folded edge 452 and is from the outside wrapped paper strip 466 held.

The paper strip 466 can be provided with an application of glue, the is wider than its overlap, so that it connects to both the free end of the strip section 403b as well as with the folded edge 452 can be glued.

Figures 14 and 15 show further variants of the overlap, the can be realized with a strip of paper which must be wider than the one from which the mouthpiece sleeves according to FIGS. 11 and 13 can be shaped.

In FIG. 14, the free ends of both strip sections overlap 503a and 501, the folded edge 552, while in Figure 15 the folded edge 652 between the free ends of the strip sections 603a and 603b come to lie.

Both versions can; again with a thin strip of paper be enveloped.

FIG. 16 shows in section a forming mandrel 397 which is in the machine 9 can be arranged in the inlet area of the format device 338 in its cross section the clear shape of the mouthpiece sleeve 358 'to be produced in Figure 11 is adapted. The recesses 398 and 399 allow trouble-free Passing the tabs 356 so that they are not pressed against the pipe wall.

Such a mandrel enables the production of a paper tube that is as round as possible possibly improve.

Stw .: Papyrosi pipe production-extrusion process-erg. I The advantage the invention is that with a relatively simple machine without expensive Guide means for several paper strips made a multi-walled paper tube can be, the individual layers of paper, as they are always initially connected to each other are, take a precisely defined position to each other.

- patent claims -

Claims (47)

Stw .: Papyrosi pipe production-extrusion process-erg. I 1> a te n t a n s p r ü c h e method for producing a multi-walled paper tube, from the mouthpiece sleeves for rod-shaped smoking articles are cut off, characterized in that, that a continuous strip of paper, the width of which is at least twice the circumference corresponds to the pipe to be produced, is continuously withdrawn from a supply that the strip is provided with a crease line in the longitudinal direction by weakening it, by which the strip is divided into two strip sections that the two Strip sections are folded together along the fold line, and that the folded Strip is formed into a double-walled tube. 2. The method according to claim 1, characterized in: that the strip is weakened by perforation and thus a fold line is formed. 3. The method according to claim 1 and / or 2, characterized in that the paper strip is wider than twice the circumference of the pipe to be produced, that the fold line produced by weakening the strip to an edge of the Strip a distance approximately corresponding to the circumference of the pipe to be produced so that a narrower and a wider strip section are formed, and that the folded strip is shaped in this way into a double-walled tube is that the edge of the narrower strip section ends before the folded edge. Stw .: Papyrosi pipe production-Strancverfahren-Erg. I 4. Procedure according to claim 3, characterized in that the folded strip is so is formed into a double-walled Ror that the wider strip section the Outerwdrid of the pipe forms and the folded edge overlaps. 5. The method according to claim 3, characterized in that the folded Strip is formed into a double-walled tube that the wider strip section forms the inner wall of the pipe and the folded edge overlaps the inner wall. 6. The method according to claim 1 and / or 2, characterized in that the strip is wider than twice the circumference of the pipe to be produced, and that the fold line produced by weakening the strip to both edges of the Strip each has a distance which is greater than the circumference of the inner wall of the pipe to be produced. 7. The method according to claim 6, characterized in that the folded-up Strip is shaped into a double-walled tube that the edge of the inner Strip section overlaps the folded edge. 8. The method according to claim 6, characterized in that the folded Strip is shaped into a double-walled tube that the folded edge the Edge of the inner strip section overlaps. 9. The method according to one or more of the preceding claims, characterized in that the strip is on both sides prior to being deformed into a tube pre-creased in opposite directions along the crease line. Stw .: Papyrossiruhr production-strand processErg. I 10. Procedure according to one or more of the preceding claims, characterized in that the strip is pre-folded in the area of the edge of the strip section, which after the forming of the tube forms the overlap. 11. The method according to one or more of claims 1 to 8, characterized characterized in that the strip is weakened on both sides of the fold line. 12. The method according to one or more of claims 1 to 8 and 11, characterized in that the strip is in the area of the edge of the strip section which forms the overlap after the pipe is formed. 13. The method according to claim 11 and / or 12, characterized in that that the strip is weakened by perforating in the longitudinal direction. 14. The method according to claim 13, characterized in that the strip is perforated in such a way that after completion of the pipe the perforations in the individual paper layers are offset from one another. 15. The method according to one or more of the preceding claims, characterized in that the strip section, which after forming into the tube forms the overlap, is provided on one edge with an adhesive. 16. The method according to one or more of the preceding claims, characterized in that the strip portion, which after the shape. n to the pipe the inner wall of which forms, is provided with incisions in such a way that flaps arise, which are bent out of the strip plane. Stw .: Papyross pipe production-strand processErg. I 17. Procedure according to one or more of the preceding claims, characterized in that the continuously produced tube is wrapped with a second strip of paper. 18. The method according to claim 17, characterized in that the second Paper strip is thinner than the paper strip from which the double-walled tube is made will be produced. 19. The method according to claim 17 and / or 18, characterized in that that a hot melt adhesive is applied to one edge of the second paper strip is, and that after wrapping the tube, a glue seam of the overlapping paper strip is solidified by cooling. 20. The method according to one or more of the preceding claims, characterized in that on the paper strip from which the double-walled tube is formed, a cold glue is applied to one edge. 21. The method according to one or more of the preceding claims, characterized in that the pipe produced is heated after shaping. 22. The method according to claim 21, characterized in that the produced Tube is moistened before heating. 23. Machine for the production of a multi-walled paper tube, of which Mouthpiece sleeves for rod-shaped smoking articles cut off by means of a cutting device in particular for practicing the method according to one or more of the preceding Claims, characterized by a carrier (1) for a paper strip roll (2) and withdrawal means (4) for continuously withdrawing a paper strip (3) from the Roller (2), a weakening agent Stw .: Papyrosi pipe manufacturer, {ng-StrangverfahrenErg. I (14) for providing the paper strip (3) with a folding lens (52), a folding device t37) for folding the paper strip (3) along the fold line (52) and a Forming device (38) for forming a double-walled tube (42) from the folded Stripes. 24. Machine according to claim 23, characterized in that the weakening means a perforating device (14) with a rotating perforating knife (16). 25. Machine according to claim 23 and / or 24, characterized in that that the paper strip (3) wider than twice the circumference of the pipe to be produced (42) is. 26. Machine according to one or more of the preceding claims 23 to 25, characterized in that the paper strips (3) in such a way for the perforating device (14) is guided that the fold line (52) at a distance from an edge of the paper strip (3) is introduced into this, which is approximately the circumference of the pipe to be produced (42) is equivalent to. 27. Machine according to one or more of the preceding claims 23 to 26, characterized in that a folding device (6) for pre-folding the Paper strip (3) on either side of the fold line (52) in opposite directions is provided. 28. Machine according to claim 27, characterized in that the folding device (6) for pre-folding an edge of the cardboard strip (-3) is formed. Stw .: Papyrosi pipe production-extrusion process-erg. I 29th machine according to one or more of the preceding claims 23 to 26, characterized in that that means (376) for weakening the paper strip (303) on either side of the fold line (352) are provided. 30. Machine according to one or more of the preceding claims 23 to 26 and 29, characterized in that a means (376) for weakening the Paper strip (303) is provided in the area of the edge forming the overlap is. 31. Machine according to claim 29 and / or 30, characterized in that that as a means for weakening the paper strip a perforating device with circumferential Perforating knives (378, 379, 382) is provided. 32. Machine according to one or more of the preceding claims 23 to 31, characterized in that an application device (21) for applying of adhesive is provided on the paper strip (3). 33. Machine according to one or more of the preceding claims 23 to 32, characterized in that a continuously rotating cutting and folding device (26) is provided for forming and folding flaps (56a, 56b) in the strip (3). 34. Machine according to one or more of the preceding claims 23 to 33, characterized in that a further carrier (168) for a second Paper strip roll (167) with take-off means (165) for continuous removal of a second one Strip (166) from the roll (167) and one of the former forming device (138) downstream second molding device (161) for enveloping the double-walled Tube (142) are provided with the second strip (166). Stw .: Papyrosi pipe production-extrusion process-erg. I 35th machine according to claim 34, characterized in that a second application device (388, 389, 391) for applying a hot melt adhesive to one edge of the second paper strip (366) and a cooling device (392) assigned to the second molding device (361) provided for an adhesive seam of the second paper strip (366) formed by overlapping are. 36. Machine according to one or more of the preceding claims 23 to 35, characterized in that the one assigned to the first paper strip (303) On application device (321, 323, 324) designed for applying a cold glue is. 37. Machine according to one or more of the preceding claims 23 to 35, characterized in that a heating chamber (275) of the cutting device (248) is upstream. 38. Machine according to claim 37, characterized in that the heating chamber (275) a humid chamber (271) is arranged upstream. 39. Tubular mouthpiece for a rod-shaped, tobacco-containing Smoking article, characterized in that the tubular mouthpiece (58) is double-walled is formed and both walls (3a, 3b) parts of a folded paper strip sin, the longitudinal edges of which end in the area of the folded edge (52). 40. Mouthpiece according to claim 39, characterized in that the longitudinal edge a wall (3a) ends in front of the folding edge (52) and the longitudinal edge of the other wall (3b) forms an overlap with the folded edge (52). Stw .: Papyrosi pipe production-extrusion process-erg. I 41st mouthpiece according to claim 40, characterized in that the overlap (57) is glued. 42. Mouthpiece according to one or more of the preceding claims 39 to 41, characterized in that the outer wall (3b) overlaps the folding edge (52). 43. Mouthpiece according to one or more of claims 39 to 41, characterized characterized in that the folding edge (452) overlaps the inner wall (403a). 44. Mouthpiece according to one or more of claims 39 and / or 41, characterized in that the inner wall (503a) and outer wall (503b) are the folded edge (552) overlap. 45. mouthpiece according to one or more of claims 39 and / or 41, characterized in that the outer wall (603a) the folding edge (652) and this the Inner wall (603b) overlaps. 46. Mouthpiece according to one or more of the preceding claims 39 to 45, characterized in that the double-walled, tubular mouthpiece (358 ') from a thin paper envelope (366) with overlapping, glued longitudinal edges is enclosed. 47. Mouthpiece according to one or more of the preceding claims 39 to 46, characterized by a protruding into the interior of the mouthpiece (358 ') Tab (356), which consists of a bent part of the inner wall (303a). L e r s e i t e