EP0102616A1 - Method and apparatus for forming a tube cutting from a flat web of flexible material - Google Patents

Abstract

The invention relates to a method and a device for creating a piece of tubing from a flat sheet (1) of paper coated with plastic by means of creasing, embossing, cutting and folding. The web (1) is pulled off a storage roll and conveyed intermittently, after being folded into a tubular shape, the longitudinal edges (21) of the web (1) are continuously connected to one another by welding, and the web is severed. In order to form and isolate the plastic-coated paper web into a tube in the shortest distance with such a method or such a device with a high throughput, the size of the hose type being designed to be very precise, the method according to the invention provides that before connecting the longitudinal edges (21) of the web (1) this is partially cut (6, 9) at least from one long side transversely to the conveying direction (2), the formation of the hose only by folding in these side panels (6) divided by the incisions (6) 10) takes place and the non-incised part (11) of the web (1) is kept essentially flat supported. After connecting the longitudinal edges of the web, its flat part (11) is cut in line with the incisions (6) at (27).

Description

The invention relates to a method for creating a piece of tubing from a flat sheet of flexible material, in particular of paper coated with plastic, by means of creasing, embossing, cutting and folding, in which the sheet is pulled off a storage roll and conveyed intermittently, after after folding in Slender shape - the longitudinal walls of the web are continuously connected to one another by gluing, welding or the like and - the web is severed.

For the production of packaging, in particular for flow agents, processes of the aforementioned type and also devices for carrying out such a process, to which the invention also relates, are already known in the form of filling machines in the production of liquid packs for milk or fruit juices . Here, a tube or tube is formed from a flat sheet of paper coated on both sides with plastic, which is intermittently removed from a storage roll, after introducing creasing and embossing lines, filled with the liquid to be packaged and formed into individual packs by welding devices, after which the individual 'pieces of tubing, which are then separated from one another by transverse sealing seams, are separated by cuts which run through these embossing lines.

It has been shown that the production of this type of packaging is already possible with high throughput rates, with most of this type of packaging being closed both on the bottom and on the top by folding and welding. The disadvantage here is the space required for such. production method and machines, because great lengths are required in order to continuously, even if intermittently, drive a flat web drawn off from a bearing roll to form a tube and to form this by means of a longitudinal sealing seam. In the known method, complex welding systems must also be used because the hose is filled with liquid in a subsequent stage after it has been created, ie after the longitudinal edges of the web have been connected to one another. This liquid inevitably exerts a certain pressure on the packaging surrounding it and thus also on the fresh longitudinal seal, so that the fresh weld seam would have to be feared without special welding devices.

In addition, it has already been proposed to provide a package with a lid or a top made of plastic without a carrier material, which is then filled and only then closed on the bottom by folding. To produce such a package, tubular pieces in the form of a cylindrical jacket have to be produced and introduced into a spraying machine in which the top part or the cover with the opening is injection molded onto one side of the tubular jacket-shaped tubular piece. The injection molding onto cylindrical jacket-shaped hose pieces with high throughputs presents insurmountable difficulties for the person skilled in the art; because there is hardly a machine conceivable with which tube pieces can be formed with such precision from a flat path that a desired suitable internal dimension can be achieved, on which on the one hand a molding tool and on the other hand the plastic molding with its dimensions can be set up in an exactly fitting manner.

The object of the invention is now to provide a method for creating such a piece of hose from a flat web and to provide an apparatus for carrying out such a method, as described in more detail at the outset, with which the web is made of elastic at high throughput , flexible material in the shortest Route is formed into a tube and isolated, the dimension of the tube piece being very precise.

With regard to the method, this object is achieved according to the invention in that before the longitudinal edges of the web are connected, the latter is partially cut at least from one longitudinal side transversely to the conveying direction, the formation of the tube takes place only by folding in these side fields divided by the incisions and the uncut part the web is held substantially flat supported and after connecting the longitudinal edges of the web its flat part is cut into the line to the incisions. The particularly novel idea of the present invention is to leave the material web in one piece up to the final average, at least partially web-shaped, before the final average, 'i.e. before separating the individual pieces of hose, but to connect the longitudinal edges of the web with each other, so that at least one partial hose is formed. This tube is already divided into pieces by the cuts mentioned transversely to the long side of the web, which later form the length of the tube piece produced. The shaping of a tube with the material web partially remaining in one piece is a hitherto unknown work process, which permits various processing operations which were previously not possible when a tube was formed.

For example, the invention according achieved by the new method, the formation of a piece of tubing on the shortest route, if the pulled from the roll _M ateri- considered albahn. In addition, welding with the shortest welding times is possible using the simplest welding method. However, this makes the production of the desired packaging significantly cheaper.

In order to be able to use an immovable or stationary knife to create the mentioned incisions instead of a knife that is movable in the conveying direction of the web, a so-called searching knife, it is expedient if the mentioned incisions and the incision from the outside of the longitudinal edges of the web transversely to the conveying direction of the The path towards the center is not done by a knife like a pair of scissors, so that the incision has practically no width of its own, but it is more favorable if these lines are generally created with "incision" by punching. This enables areas to be punched out. Preferably the shape of these surfaces is elongated, i.e. Instead of the line-like incisions, double-line incisions can also be provided by punching out a narrow band.

It is furthermore advantageous according to the invention if the flat web receives incisions of approximately the same length from both longitudinal sides, the inner end of which extends up to the crease lines introduced into the web, and if the sum of the areas of the side fields divided by the incisions is greater than that Area of the middle, flat part of the path between successive pairs of cuts. The creasing can be done at the paper manufacturer. However, it is also possible to introduce the creasing lines with the machine using the method according to the invention at the beginning of the working process described here. These creasing lines run along the web conveying direction. They serve to fold in the side fields formed by the incisions on the middle, planar part of the web formed thereby. If one looks at a piece of the web, which will later become the tube piece, between the successive pairs of incisions, one can compare the area of the middle flat part with that of the folded-over side panels. If the sum of the areas of the folded side panels is larger than that of the middle flat part of the web, a tube cross section can be formed, one part of which is flat and the other part is curved. The curved part is the one with the larger surface, in the case of the present example with the folded-over side panels. But on this are the longitudinal edges of the web, which are to be welded together. The welding in this form is advantageously stress-free, and this is also the reason why the simplest welding method can be used with very short welding times and without cooling time, preferably the use of constant contact heat. After the welding process there are no forces in the paper web or tensions which would put a considerable load on the fresh sealing seam.

The invention is advantageously further developed in that the side panels folded in along the creasing lines and formed into a tube piece are pressed together at one end next to the incisions to form a cone. It was explained at the beginning that when a cover is molded onto one end of a piece of hose, exact dimensions have to be observed simply because of the injection molds. It has also been shown that it is extremely difficult to form a tube or a piece of tubing with exact internal dimensions in such a way that these could be pulled onto a mandrel, for example. Such mounting would be feasible if, according to an inventive concept, the shape of the tube piece was frustoconical. To achieve the truncated cone shape, one end of the tube piece must be equipped with a smaller diameter than the opposite end. Since the creasing lines can be most easily introduced into the web when they run parallel to the web conveying direction, the measure mentioned above must be carried out in accordance with the invention, namely the side panels at the relevant end of the hose piece in the region of the creasing line. If this compression occurs immediately before or during the welding process, the seal takes off the reduction in the diameter, which is achieved by the compression beyond the crease line, sews on and fixes this reduction in diameter immediately. But with that you have in a very simple way a weakly cone-shaped piece of hose, which, moreover, is even partially isolated, ie part of a path.

Therefore, it is advantageous if, in a further embodiment of the invention, after cutting through the flat web part, the piece of hose is pushed aside occasionally transversely to the conveying direction of the web and raised to a circular cross-section. The piece of hose was provided with a previously non-circular cross-section, for example with the cross-section of a segment of a circle, through the middle part of the web that had just been held. Therefore, it is favorable if the cross section of this piece of hose after the separation, ie cutting through in the line of the incisions previously made, is at least approximately in the form of a cylinder jacket, with one end, as mentioned above, of a slightly larger diameter than has its other end, so that one could speak of a truncated cone when exaggerated. Then, when the injection mold as a counter-mold the shape has a tapered mandrel also a very weak frusto-conical tubular body can be seen easily by suitable ejectors onto the mandrel defer, so that the end of the pushing action, the narrow side of the Ke ^g elstumpfes on the front of the mandrel quite tight, ie with the appropriate dimensions, comes to rest. This last-described side of the mandrel is then part of the injection mold, so that the tool halves can lie very precisely around the end of the hose piece. The method is expediently further designed such that, according to the invention, the web is cut transversely to the conveying direction by punching in such a way that the incision which runs inwards from the longitudinal edges of the web te have a width of at least 1 mm. While an incision literally represents a cutting line that has no width itself, a line of a certain width can be obtained by punching out. In other words, by using a punch knife along the incision to the desired depth, a strip-shaped part of the web which has a width of 1 to 5 mm, preferably 2 to 3 mm, can be removed. The advantage of making a punched-out incision, ie a punched-out area in which the incision would otherwise lie, is that the width of the strip or punching incision resulting in the conveying direction of the web specifies a tolerance or a tolerance field, so that the final one Cutting through the middle field of the web, namely the field between the transverse incisions, a fixed knife or knife that cannot move in the conveying direction of the web can be used. The arrangement and use of such a knife may be less complex than if a so-called "searching" knife which is movable in the longitudinal direction of the web is used.

The device for carrying out the method has cutting, feeding and folding devices according to the invention and is characterized in that a flat support plate, extending from the folding station to the cutting station, is held stationary in the conveying direction of the web in such a way that it is at least partially removed from the web It is included that in the conveying direction between the welding station having at least one constant contact heat jaw and the cutting station having a movable knife, feed drive rollers are arranged above and below the web, and that a distribution station with a hose erecting device is arranged downstream. With these measures, it is possible to bring the web of flexible, elastic material, for example the paper web here used to explain the invention, to both sides by cutting and folding it into the above-mentioned tube shape with the segment-shaped cross section. There is a part the web under the support plate, while the two folded side panels are arranged above it. This arrangement is achieved in that, according to the invention, the folding station has levers which can be rotated about an axis lying in the web conveying direction and transverse mandrels which are fastened to them and which lie parallel to the axis. After cutting transversely to the longitudinal direction of the web to form the side panels, the transverse mandrels are rotated and pivoted inward about the axis mentioned about the support plate via the rotatable levers, so that the support plate is now almost completely encompassed by the material web. During the intermittent or intermittent forward movement of the continuous web from the folding station into the next welding preheating station, it can be useful if the welding counter jaws are arranged above the support plate and the longitudinal edges of the web to be connected are pushed onto these jaws while the transverse mandrels are still in be held in the swiveled-in position or holding rails hold this tube layer of the paper web up. When the web is conveyed further into the welding station, the longitudinal edges to be connected lie directly between the welding jaws in the desired manner, so that the hose formation can take place, although part of the web also in the form of the middle flat area of the web is still part of the continuous web remains.

It is also expedient according to the invention if an adjustable sliding cutting device with a photocell controlling the drive rollers is arranged in front of the folding station in the web conveying direction. This allows the device to be adjusted to different lengths of hose. The distance of the connecting line between the two incisions on the one hand and the photocell on the other hand will remain the same in all embodiments, but the distance of this cutting device or the photocell from the knives of the cutting station can be according to the necessary division or number of hose pieces in between can be changed. The device can therefore be converted to different products with simple means.

It is also advantageous according to the invention if the welding station has pressure jaws movable to the side next to the edges of the support plate at a small angle of inclination to the latter. As a result, an exact inside dimension of the hose piece can be achieved without a calibration mandrel. It has already been mentioned above in a factually similar context that it is expedient if conical hose sections can be produced because a truncated cone is easier to pull onto a mandrel than an exact cylindrical jacket-shaped hose, especially when one considers that the one hose end fits exactly on that Mold part forming end of the mandrel must be applied. The conical hose section can now be created with the aforementioned movable pressure jaws. They are at a small angle of inclination - if you look in the direction of web conveyance - to the long side edges of the support plate. The movement of these pressure jaws is perpendicular to the web conveying direction ^. With their help, it is thus possible to apply pressure to the edge of the support plate on one end of the tube piece, viewed in the conveying direction, the front end, while it is omitted on the other side. As a result of this pressure, the respective side wall field formed by the incisions is pressed against the support plate next to the crease line introduced, so that the tensions of the paper are thereby practically eliminated. With the pressure jaws, you push the paper practically beyond its tension around the edge of the support plate, ie against the resistance of the flat paper, because the folding takes place in the vicinity of the crease and not in the crease line itself. Since "these movable pressure jaws are provided in the area of the welding station, the reduction in the diameter of the tube piece at this point is immediately effected by the welding process fixed. Practice has shown that a conical tube section can be achieved and created very easily with these means, in which a part still belongs to traversing webs and, after cutting and separating the finished tube piece, an exact internal dimension is achieved without a calibration mandrel; because the compression around the edges of the support plate is controlled in such a way that exactly the desired internal dimension of the finished piece of hose is ultimately achieved.

It is also expedient according to the invention if at least. a feed drive roller has a central recess on the circumference. Seen in the direction of conveyance of the web, the feed drive rollers are arranged behind the welding station. This does not result in any disadvantages for the promotion of the railway; because the train continues to the storage roll. The advantage of this arrangement of the rollers behind the welding station is, however, that the drive rollers hold the piece of hose down, so that there is practically a flat tube in cross section, the feed drive roller advantageously running directly over the weld seam. So that this is not undesirably claimed, the mentioned central recess is provided. This means that the seam is stressed, e.g. also the occurrence of undesirable shifts, advantageously switched off. The so-called edge protection, which is a thin film in the area of the longitudinal seal seam, is also protected by the central recess, because otherwise the line protection may cause excessive pressures to be transferred to the edge protection film.

In a further advantageous embodiment of the invention, connecting rails which extend across the width of the support plate and are attached to the ends of these rails are attached to the ends of these rails, while a slide is movably guided between the connecting rails in the distribution station.

The slider is cyclically moved to the right or left transversely to the web conveying direction, depending on the direction in which the piece of hose separated by the cutting station is pushed aside. One can namely increase the throughput or the machine performance of the device according to the invention considerably if the hose pieces created by the web are divided into two processing paths, because then each processing path has more time for further processing, in particular when molding a lid or base onto one Hose piece. Towards the end of its respective stroke, the slide is always outside the path and thus outside the width of the support plate, which, however, is not absolutely necessary behind the cutting station. It is more expedient if the tube or the tube piece in the conveying direction behind the cutting station is empty on the inside, so that the slide can push the tube aside without great expenditure on the device. He expediently pushes it into a hose fitting on the respective side with a circular cross-section in which the hose piece then straightens up to the desired shape. The slide can preferably support the erection process by pushing to the end position. Thereafter be completed after the _D urchschneidestation the next length of tubing, so that the slider its direction of movement transversely to turn to the conveying direction and can push the next section of tubing in the opposite direction -in another hose fitting, in which the same erection process is carried out as just described.

The tube section can be pushed out of the tube fitting in the direction of its longitudinal axis by ejectors onto the spray mandrel already mentioned, where further processing, first of all the injection of the cover, can then take place.

It is also expedient according to the invention if the knives of the cutting station are fixed in the conveying direction of the web.

In this case, a simpler Durchschneidesta- can ^t ion build up, because as in the case of scissors vertically Although two blades are movable relative to the conveying direction of the web and provide an incision, a search of the two blades or movement thereof in the longitudinal direction or conveying direction of the web but is not required. So that such a cutting station with knives immovable in the conveying direction can be used, the incision in the side fields, which was in each case transverse to the web conveying direction, was made by punching in such a way that the resulting punch incision itself had a width of 1 to 5 mm, preferably 2 to 3 mm, has. This results in a tolerance range into which the fixed knife falls even when cutting through the middle piece of sheet, if the sheet is 1 or 2 mm from the center of the punching incision forwards or backwards.

It is also favorable according to the invention if the cutting device is a punching knife that cuts out a partial surface.

It has been described that the incisions or punching incisions or punching fields running from the outside transversely to the web conveying direction can go either from the outer longitudinal edges all the way to the respective perforation line running in the web conveying direction or only from this perforation line to just before the outer edge, depending after whether the web receives the cuts or punching strips beforehand and is then pulled onto a storage roll or only in the machine described here. If the incisions or punching strips are already made during the paper preparation, which must then not extend up to the outer edge, the cutting device can also provide the tolerance field required for the fixed cutting knife on the outer longitudinal edge if it is a punching knife that cuts out a partial area.

Further advantages, features and possible uses of the present invention result from the following description of preferred exemplary embodiments in conjunction with the drawings. Show it

• 1 schematically shows the top view of a paper web coated on both sides with plastic for creating a tube piece for a liquid pack,
• 2 is a sectional view through the web of FIG. 1 along the line II-II,
• 3 shows a side view of a machine for producing a tube section or tube piece from the flat path shown in FIG. 1,
• Fig. 4 is a sectional view through the folding station along the line IV-IV of the Fiq. 3,
• Fig. 5 broken off and schematically a sectional view along the line V-V in Figs. 3 and 6 and
• 6 is a plan view of the right part of the machine of FIG. 3rd

It is assumed that the paper web 1 is moved forward intermittently in the direction of the part 2 and that the embossing field 3 has already been introduced into the paper manufacturing factory. It is also assumed that the crease line 4 is already provided in the paper web 1. On the other hand, at a distance a from the embossing field 3, the incisions 6 running transversely to the longitudinal edges 5 are made in the web 1 in the machine described here, specifically by the knife 7 shown in FIG. 3.

However, it is entirely possible to create the crease lines 4 as well as the embossing field 3 only in the machine described here in the figures. As a further alternative, it is possible to have the incisions 6 already made in the web by the paper manufacturer. But if this is up run continuously to the outer edge 5 of the paper web 1, rolling up in the bearing roll 8 is impossible. However, this difficulty can be circumvented in that beläßt- uncut at the position shown in Fig. 1, right above the point 9 Pa ^p ierher- manufacturers here a small web The knife 7 shown in Fig. 3, then instead of the described incisions 6, which extend up to the _R illinien 4 inwardly to bring only one incision along the line 9 (Fig. 1) in the web 1.

After the incisions 6 have been made, the web is then moved in the direction 2 from the first right position to the next following second position. This is where the preparation for folding in the side panels designated by 10 takes place, by means of which a flat central panel 11 of the web 1 is formed. The border of the middle field 11 is formed by the two crease lines 4. The folded state is shown in the third position from the right in FIG. 1, in which the web 1 has become narrower by the two side panels 10. One recognizes in the second position the strip with the width a which runs transversely to the conveying direction 2 to the left of the embossing field 3 from one edge 5 to the other and which later forms the closing seam. It is understood that in the third position from the right this closure seam is shorter because it is laid twice.

Incidentally, the representation of the fold-in is shown in FIG. 1 in such a way that first the fold-in takes place from bottom to top and then the second fold-in takes place from top to bottom, so that the edge 5, which is initially on the top outside, can be seen in the middle as a solid line while the lower longitudinal edge 5 can only be seen in dashed lines.

The web 1 then moves further from the third to the fourth position, which belongs to the welding station 12 and represents the preheating area 13. Here you can see schematically the one running over the middle longitudinal seam heated welding jaw 14, which softens the plastic layers to be sealed together in the preheating section 13, so that these are then connected to one another in the actual welding station 12 in FIG. 1 to the left of the preheating station 13.

At the right end of the fifth position from the right, which represents the area of the actual welding station 12, the web 1 is compressed with the help of the pressure jaws 15 movable in the direction transverse to the web conveying direction 2 according to arrow 16. These pressure jaws form the cone shape or truncated cone shape of the producing piece of hose in that they are arranged at a small angle α to the web conveying direction 2. The front end of the pressure jaws 15 seen in the transport direction 2 of the web 1 is narrower than the rear end. The cone formation of the hose section can be explained particularly clearly with reference to FIG. 2. This is a cross section through the fifth position just described in the welding station 12 along the line II-II. 2 shows the cross section of the flat support plate 17, which is bevelled on its two longitudinal edges 18 in order to better adapt to the cross-sectional shape of the web 1 which has already been folded over in a tubular manner. It can be seen that above the support plate 17, the cold counter-jaw 19 is fastened with a step 20, in which the end edge of the lower side panel 10 which has been folded in first can be inserted, while the upper, subsequently folded in side wall panel 10 can be put over the then smoother surface. On the side opposite the cold counter jaw 19 and the support plate 17 from the side panels 10, the flat web part 11 is arranged. 2 shows the sector-shaped cross section of the tube, the longitudinal edges 21 and 22 of which lie under the heated sealing jaw 14. To better hold the side panels 10 in the hose shape shown in FIG. 2, guide rails 23 are preferably arranged.

2 shows the width Y of the support plate 17, which is obviously smaller than the distance X (FIG. 1) between the crease lines 4. In other words, there is in each case on the edge 18 opposite the web 1 with the crease 4 some games

2 also shows. in cross-section the pressure jaws 15, which, when pressed together, eliminate the above-mentioned play by folding the side wall panels 10 slightly apart from the crease line 4, increasing the overlap of the edges 21 and 22. This folding takes place under slight pressure against the resistance of the sheet material, i.e. the paper itself, which has to be transformed from the flat shape into a strong curvature.

From Fig. 1 it can be seen that this narrowing of the dimension X almost to the dimension Y is carried out only on one, the right end in the fifth position of Fig. 1 from the right on the web 1. At the opposite end, the width dimension X of the web 1 remains unchanged, so that later the large circle of the truncated cone is formed after erection and the small circle of the truncated cone on the side described first.

In the sixth position in Fig. 1 from the right you can see the feed drive rollers 24, which hold down the freshly welded edges 21 and 22 as shown in Fig. 3 on the right, so that no forces can develop that try in spite of the tensionless state in the paper could blow up the longitudinal seam 25. Both feed drive rollers 24 have a central recess 26 on the circumference, in which the double longitudinal seam 25 runs.

Before the length of hose Z is conveyed to the leftmost position shown in Fig. 1 on the left, the flat subfield 11 of the web 1 is cut through at the point 27 exactly in the line of the incisions 6. This average, designated 28 in FIG. 1, extends over the total width X of the hose section and separates a hose section with the length Z from the other.

When the average and thus the separation of the tube piece is completed, a slide shown in FIG. 5 ensures the lateral discharge in the direction of arrow 30 or 31 into tube fittings 32, where the flat tube is erected in a circular shape.

From the side you can see the web and the device processing it in Fig. 3. From the roll 8, the web 1 is drawn in the conveying direction 2, pulled by creasing rollers 33 and the roller motor 34 with pressure roller 35. The creasing rollers 33 have the task of introducing the creasing lines denoted by 4 in FIG. 1, around which the foldings take place. The roller motor 34 pulls the paper web 1 from the creasing station 33 via a loop 36 to two further deflecting rollers 38 and 39. This transfer of the conveying force from the roller motor .34 takes place via the pressure roller 35. The roller motor 34 is controlled by the photocell 37. The loop 36 can assume various positions, e.g. also the position 36 'shown with dashed lines above. After running out of the lower deflection roller 39, the flat paper web 1 receives the conveying direction shown by the arrow 2. It travels through a photocell 40 which controls the feed drive rollers 24.

As already described above with reference to the material to be processed, the knives 7 make the transverse incisions 6 (or 9) transversely to the longitudinal edges 5 of the paper web 1. 1, the distance d of the incisions 6 from the photocell 40, which should remain the same for all lengths of tube pieces, for converting the machine to different tubes piece lengths receives a calculated different distance from the knives 41 and 42 (upper knife and lower knife) of the cutting station 43.

After the incision 6 has been made, the web 1 moves into the folding station, generally designated 44. There are levers 46 and 46 ′, respectively, rotatable about an axis 45 lying in the web conveying direction 2 for the opposite side and transverse mandrels 47 attached to it and lying parallel to the axis 45.

The construction of this fold-in station -44 is also apparent from FIG. 4, in which a view is taken in the conveying direction 2. When the flat paper web is in the folding station, the transverse mandrel 47 or 47 'is moved via the lever 46 or. 46 'is pivoted upwards along the arrow 48 or 48', so that the transverse mandrel 47 (as well as the transverse mandrel provided with the apostrophe) is brought into the position 47 ". In this position the transverse mandrels remain in place while the material web, ie the coated paper, which comprises support plate 17 in the manner of Fig. 2. When fed from the folding station 44 into the welding station 12, the transverse mandrels 47 and 47 'remain in the position designated by the two apostrophes, in order to improve the side panels 10 The transverse mandrels 47 "do not move back to the starting position 47 until the web section under consideration has entered the preheating zone 13 of the welding station 14.

After preheating in zone 13, the web section is completely welded in the welding station 12 by the two strips 21 and 22 shown in FIG. 2 being connected to one another by constant contact heat.

3, the web is then conveyed further to the right until the incisions 6 and 9 have reached the point 27 (FIG. 1), at which point the cutting knives 41 and 42 are arranged and ensure the cutting through of the still flat web section 11 and thus separation of the hose piece.

Due to the multiple steps of the path 1 from one station to the other - up to the feed drive rollers 24 and the rotatably suspended knife 41, 42 - a tolerance can be expected at the interface 27, which the knife 41, 42 should follow. Upper knife 41 and lower knife 42 are hinged together at a point 52 and can be pivoted against each other like scissors about axis 61 (FIG. 6). One can see in FIG. 3 to the right of the point 27 the upstanding tube part with the side panels 10 as shown in FIG. -2, while to the left of this tube part with the side panels 10 is held down by the drive feed rollers 24. This results in a stop for the upper knife 41 oscillating from left to right about the axis 52, which, when the stop is reached at the exact point desired, can perform the average in alignment with the incisions 6.

From Fig. 3 one can see in the cutting station 43 above a pneumatic cylinder 50, the piston of which is connected at the pivot 51 to the short lever of the swivel arm 53 (up to the pivot 52). This "searching knife" is operated in such a way that, after the average has been completed in position 27, the knives 41, 42 together with the swivel arm 53 pivot clockwise around the pivot 52, driven by the pneumatic cylinder 50. Then when the web to be cut, i.e. the partially cut hose moves into the position shown in FIG. 3, the direction of rotation of the swivel arm 53 is reversed, so that after the incisions 6 of the web 1 have reached their end position at the point 27 when the photocell 40 commands the drive rollers 24 to " stop "has given, the upper knife 41 moves up against the stop and can then carry out the cutting process.

At the next feed, the web runs into the forming station, generally designated 54. 6 and in the cross-sectional view in FIG. 5, which is taken along a section line V-V in FIGS. 3 and 6. At the same time, this is also the distribution station 70, in which the individual piece of hose according to FIG. 1 is moved laterally out of the conveying direction 2 of the web 1 in the direction of the arrows 30 or 31. This movement out takes place by means of the slide 29, which is in its non-operational position outside the web width X, which can be found in FIG. 5 approximately, although the tube section has taken on a somewhat different shape after leaving the support plate -17. as shown in Fig. 2. This hose section is now pushed to the right by slide 29, for example in the direction of arrow 71 in FIG. 5, slide 29 with a piece of hose moving within connecting rails 72. These rails 72 can also have a plate-like configuration. They are connected at their respective ends to the tubular fittings 32 which are hollow on the inside and have a longitudinal axis parallel to that of the tubular piece. On the side opposite the gap for the slide 29, the tube molding 32 has an indentation 73 inside, in which, in the illustration in FIG. 5, the right edge of the tube piece can center after being pushed in. In this way it is ensured that the doubled longitudinal seam with the edges 21 and 22 remains exactly in the right place in the molding 32. From the cross-sectional view of FIG. 5, one can also see recesses 74 on the right, which do not interfere with the erection of the hose section into the shape of the weak truncated cone, but advantageously guide rails for ejecting the erected hose section onto the mandrel 64 shown in FIGS. 3 and 6 form.

FIG. 6 shows the arrangement of ejectors 63, the front view of which can also be seen on the left side of FIG. 5 is. Corresponding to the recesses 74 in the shaped piece 32, the front sliding plate of the ejector 63 has projections 75, into which the piece of hose hooks up with certainty when it is ejected. In this way, the isolated piece of hose can be pushed onto the mandrels 64 from the hose fittings 32.

Although two slides 29, 29 are shown in FIG. 5, there is in fact only one slider 29 which moves in one of the two positions shown.

In Figure 1, the incision 6 is already a double line. shown, so that you can already see the punch 6 or the punched strip 6 here.

In the lower part, this punched strip runs continuously from the outer longitudinal edge to the perforation line 4 running in the web conveying direction 2. In the upper part the other alternative embodiment is shown, in which this punch cut 6 does not extend all the way to the upper edge. In this latter embodiment, the punch cut has already been made during the paper preparation, after which the web 1 is drawn onto a roll. In the machine described here, only the edge incision 9 then has to be made, but this can also be made by means of a punch knife in such a way that the resulting incision itself has a width, i.e. is a die cut strip. Both the incision or the punching strip 6 and the punching strip 9 that then results have a width of preferably 2 to 3 mm.

Claims (13)

1. A method for creating a piece of tubing from a flat web (1) made of flexible material, in particular paper coated with plastic, by means of creasing, embossing, cutting and folding, in which the web (1) is pulled off a bearing roller (8) and conveyed intermittently is, after folding in tubular form, the longitudinal edges (21, 22) of the web (1) are continuously connected to one another by gluing, welding or the like and the web is severed, characterized in that before the longitudinal edges (21, 22) of the web are connected (1) this is partially cut (6, 9) at least from one long side transversely to the conveying direction (2), the hose is formed only by folding in these side panels (10) divided by the incisions (6) and the non-cut part ( 11) the web (1) is held substantially flat supported and after connecting the longitudinal edges (21, 22) of the web (1) its flat part 111) in line to the incisions (6) du cutting (at 27). 2. The method according to claim 1, characterized in that the flat web (1) from both longitudinal sides about the same length incisions (6, 9) receives, the inner end of which extends into the web (1) introduced creasing lines (4) and that the sum of the areas of the side fields (10) divided by the incisions (6) is greater than the area of the central, flat part (11) of the web (1) between successive pairs of incisions (6). 3. The method according to claim 1 or 2, characterized in that the along the creasing lines (4) folded and formed into a tube piece side panels (10) on one Compress the end next to the incisions (6) to form a ronus. 4. The method according to any one of claims 1 to 3, characterized in that after cutting through the flat web part (11) the piece of hose is pushed aside occasionally transversely to the conveying direction (2) of the web (1) and erected to a circular cross section. 5. The method according to any one of claims 1 to 4, characterized in that the cutting (6, 9) of the web (1) transversely to the conveying direction (2) is carried out by punching such that the of the longitudinal edges (21, 22) of the web (1) inward transverse incisions (6, 9) have a width of at least 1 mm. 6. Device for performing the method according to one of claims 1 to 4 with cutting, feeding and folding devices, characterized in that a flat support plate (17), from the folding station (44) to the cutting station (43) reaching, in the forwarding direction (2) the web (1) is held stationary in such a way that it is at least partially encompassed by the web that in the conveying direction (2) between the welding station (12) having at least one constant contact heating jaw (19, 14) and the one movable knife ( 41, 42) having cutting station (43) above and below the web (1) feed drive rollers (24) are arranged and that a distribution station (70) with hose erecting device (54) is arranged downstream. 7.'Device according to claim 5, characterized in that the folding station (44) about an axis in the web conveying direction (2) lying axis (45) rotatable lever (46) and attached to this, parallel to the axis (45) transverse mandrels (47) having. 8. Apparatus according to claim 5 or 6, characterized in that in the web conveying direction (2) in front of the folding station (44) an adjustable sliding cutting device (7) with the drive rollers (24) controlling photocell (40) is arranged. 9. Device according to one of claims 5 to 7, characterized in that the welding station (12) laterally next to the edges (18) of the support plate. (17) at a small angle of inclination (α) to this movable jaws (15). 10. Device according to one of claims 5 to 8, characterized in that at least one feed drive roller (24) has a central recess (26) on the circumference. 11. The device according to one of claims 5 to 9, characterized in that in the distribution station (70) transverse to the web conveying direction (2) extending connecting rails (72), the width (Y) of the support plate (17) spanning, are attached the ends of which are attached to hose fittings (32) and between which a slide (29) is movably guided. 12. The device according to one of claims 6 to 11, characterized in that the knives (41, -42) of the cutting station (43) in the conveying direction (2) of the web (1) are fixed. 13. The apparatus according to claim 8, characterized in that the cutting device (7) is a punching knife cutting out a partial surface.

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