DE3146371A1 - PIPE STRIP PRODUCED FROM A CONTINUOUS, SCREW-HELD-SHAPED RAIL FROM PAPER, CARDBOARD OR SIMILAR MATERIAL, AND METHOD FOR THE PRODUCTION THEREOF - Google Patents

Abstract

1. Portative tubing of round cross section manufactured from a continuously helically wound web material having high restoring forces after elastic deformation such as paper, paperboard or the like, the wall or wall thickness of which tubing is defined essentially by at least one layer of flutes lying parallelly to each other and being aligned with their main extension in the longitudinal direction of the web and of the helices, as well as inner and outer covering layers for the flutes, neighbouring marginal areas of the web being connected to the covering layers in the area of the crests and hollows of the flutes, characterized in, that at least one of the covering layer forms, by way of a side strip (21, 22), an integral component of the undulated web material (23) of neighbouring winding sections, and that neighbouring marginal areas of the undulated web material overlap each other and are connected with each other.

Description

31Α637Ί

1. Günter Schäfer, Kantstrasse 54, 6238 Hofheim

2. Europa Cärton Aktiengesellschaft, Spitaler Strasse 11, 2000 Hamburg 1st

Made from a continuous, helically wound web of paper, cardboard or similar material Pipe string and process for its manufacture

Field of invention

The invention relates to one of a continuous, helically shaped wound pipe made of paper, cardboard or similar material, whereby to form the Pipe string wall edge areas of the web overlap one another and are firmly connected to one another, as well as a method for producing a continuous, from a continuously running web of paper, cardboard or similar material helically wound pipe string. The term "Similar material" refers to materials that are considered to be of quality, behavior and / or use Substitution materials for paper or cardboard come into consideration, e.g. plastic-laminated paper or cardboard, Laminated papers or cardboard, textile plastic laminates or combinations of such materials, and those during deformation Are subject to restoring forces, so they tend to return to their original shape.

State of the art

In the production of paper or cardboard tubes, which are used for example for the production of shipping tubes, sleeves for household paper ι coils, etc., it is known to wrap several paper webs one above the other over a mandrel, the thickness of the wall of the continuous pipe string cut tubes, sleeves or spools from the number of paper web layers that are wound on top of each other, determined. The individual helixes overlap each other in a narrow

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len margin calculation. A deformation of the paper webs does not take place in this known method. Such pipe strings are very stiff, i.e. they cannot be bent, and their weight and paper consumption are relatively high due to the multiple wrapping.

It is also known to produce continuous pipe strings from an aluminum foil web, which are also continuous is helically wound after it has previously been shaped into waves over its entire width. Such strings of pipe are mainly used for the production of air conditioning and ventilation pipes and can be cut to the desired length Usual thicknesses of the aluminum foil are between .0.08 and 0.2 mm. As a result of the waves are the pipe strings or pipes are easy to bend. Due to the material properties of aluminum, the shafts are very dimensionally stable, i.e. their Deformation is only possible when force is applied to them. A major disadvantage, however, is that they are only minor Absorb stretching, tensile and compressive forces. In addition, aluminum is used as a material for various purposes relatively expensive.

Task

The invention is based on the object of creating a pipe string of the type described at the outset which has a high degree of strength with low weight, and at the same time to propose a method of the type also described above, with which can be produced in a cost-effective manner such pipe strings.

Solution and advantages

The object on which the invention is based is achieved in the case of a pipe string in that the web has at least part of its width with a plurality of parallel juxtaposed, with their main extent in the longitudinal direction the track and helix of aligned shafts is formed.

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In the method, the object is achieved in that the web in at least over part of its width to itself their longitudinal and running direction extending waves deformed and partially overlapping and connecting their side edges is joined to the pipe string wall.

The advantages that can be achieved with the invention consist in particular in the fact that a pipe product of extremely low weight with surprisingly high strength values for materials such as paper or similar materials is obtained, which is suitable as a Sübstitiitionsproäukt for a wide variety of purposes. Such pipes, whose walls can be structured in the manner of corrugated cardboard, can be used both for packaging and as sleeves or supporting elements for coils , but they are just as suitable for insulation purposes as for the transport of gaseous or - with appropriate impregnation - liquid media into consideration. With the invention, therefore, a mass product of relatively high quality can be achieved for a wide variety of requirements in relation to the material costs, if one takes into account that paper materials obtained in recycling can be used for many purposes.

Developments of the invention

In order to achieve the strongest and most stable possible combination of adjacent web parts and at the same time achieve the required dimensional stability with regard to the restoring forces of the material, various measures can preferably be used individually or in combination with one another.

So should and can expediently each part of the two - in relation to the web width - on the outside Waves from the parts of the paper web that are next to each other in the overlap area touch in the flank area and be there rait © islander ^ arbunden. Cook it can be more beneficial however, in many applications, "when V" is minor one of the waves lying next to each other in the overlap area

Parts of the web in engagement with at least one shaft of the Neighboring part of the train is located. It can be left open what part of the web width the waves occupy. The waves can also be arranged over the entire width of the web, in which case at least the two outer waves of adjacent track parts should overlap in an interlocking manner around the to fulfill the aforementioned purpose.

It is very advantageous if the web has a non-corrugated side strip on at least one side of the corrugations, which covers at least part of the corrugations of the adjacent part of the track and is connected to the covered corrugation heads is. This non-corrugated side strip is not only used as a smooth covering of the waves, but acts as a load-bearing element with regard to their dimensional stability and prevents them a smoothing of the waves due to the restoring forces of the material. In this context it is particularly advantageous to form or leave the path on both sides of the waves with an unwaved side strip, one of which is the underside of the one adjacent track part and the other overlaps or covers the upper side of the other adjacent track part. The result is a pipe string which, seen in cross section, can have a completely smooth inner and outer wall, while the wall thickness in between is formed by the corrugated material and thus the strength-determining material Forms part of the pipe rod.

It should also be mentioned that despite the overlapping smooth web parts Advantageously, the outer shafts should also interlock in order to have sufficient "toothing" in the edge area. to achieve.

Preferably, the web is at least in the area of the corrugations with a material-stiffening application of wax, a thin one Plastic film or the like. coated or impregnated. These

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Measure is unavoidable in those designed according to the invention Pipe strings in which no smooth lateral overlapping areas are provided, but which are continuous are corrugated over the entire width of the web, otherwise by the restoring forces of the material after leaving the die Waves generating devices would be smoothed immediately. The material stiffening order thus serves Dimensional stability. However, it can also expediently be used in cases in which smooth side overlaps be provided, especially when high demands are made on the pipe string material. Such Requirements can be, for example, both strength and tightness, i.e. Impermeability to gases and Liquids.

Since in a pipe string designed according to the invention with a Wall thickness of a few millimeters the area of the inner wall is subject to compression forces' (principle of the accordion or of the stovepipe elbow; Tensile and compressive forces in relation to neutral fiber on Biegebaiken), the web can at least in the area the parts forming the inner wall of the pipe string, such as corrugations and / or inner overlap with a substantially transverse to the Be provided with knurling extending in the longitudinal direction of the paper web. So the compression is better absorbed; be through them compensates for the opposing forces occurring in the outside area.

Furthermore, the pipe string wall can consist of at least two superimposed, helically wound and with provided shafts running in the longitudinal direction of the helix Be formed tracks. Such double or even multiple layers, i.e. the use of more than two layers, is particularly advantageous if a thicker wall is required for reasons of strength or insulation »

Also in the manufacturing method described above, there are various preferred implementation options.

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With regard to the compression forces mentioned, the The web can be pre-deformed, e.g., knurled, over at least part of its width essentially transversely to its longitudinal direction. This is done, for example, with finely grooved knurled rollers.

The shafts are preferably produced by pushing them together the web transversely to its longitudinal extension, and in a particularly preferred manner in steps, in order to reduce the forces exerted on the material during the formation of waves to keep manageable limits. The wave formation can be symmetrical in stages, starting in the middle of the track, but it is also possible to do it asymmetrically, e.g. starting from one side.

In view of the restoring forces of the material, the web can at least in the area immediately after the formation of the corrugation the waves with a stiffening material such as wax, solidifying liquid plastic or the like. soaked, coated or in a similar way.

To get to the fixed connection in the edge area of the neighboring To concern web areas, the procedure is so that the web in these overlapping areas before the helical Wrap at least partially, in particular at the heads of the overlapped or overlapping shafts Adhesive is provided and glued. Such a connection is simple to make in terms of the process and is part of the overall process of the manufacturing process.

Depending on the requirements of the end product, the corrugations can be formed over part of the web width in such a way that either a smooth side strip remains on one of the two sides of the web, covering the entire width of the corrugation overlaps or underneath adjacent track part, or that a smooth side strip on each side of the track remains, in which case one of the side strips reaches under its adjacent track part and the other

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Side strip overlaps its neighboring part of the track. So either a single-layer or a double-layer smooth covering of the shafts is obtained. For solid, shape-retaining The connection is created by the waves in the area of their heads as well as at appropriate and suitable locations the smooth side strips are covered with glue such as glue and glued to the overlapping adjacent parts of the web »

In the production of multi-layer pipe strings, the procedure is advantageously such that at least two tracks are formed of the shafts are wound on top of each other and connected to each other.

If this is required by the overall requirements, e.g. with regard to special insulation, tightness and / or strength requirements, the pipe string wall can advantageously have a smooth surface on its inside and / or outside Paper or film web are covered.

Embodiments

Some examples of the invention are shown in the schematic Drawing shown and are explained in more detail below. It shows

1 shows a cross section through part of a inventive device trained pipe string,

various stages in the formation of a pipe string according to FIG. 1,

Fig 3 = a gate on an enlarged scale III-III of FIG. 2 "

a variant of the training according to Fig. 2,

2 -

ό I4bo / I

5 shows, on an enlarged scale, a section V-V of the Pig. 4,

FIG. 6 shows a cross section of a part of a structure of a pipe string that is modified from FIG. 1 according to the invention,

FIG. 7 shows, in cross section, part of the wall of the pipe string of FIG. 6 during manufacture,

8 shows a section VIII-VIII on an enlarged scale of Fig. 7,

9 shows a further embodiment variant of the pipe string according to FIGS. 1 and 6 in cross section,

Fig. 10 is a cross section through part of the wall of the The pipe string of FIG. 9 during manufacture,

11 shows, on an enlarged scale, a detail XI-XI of Fig. 10,.

12 shows another embodiment of a pipe string according to the invention,

13 shows a further embodiment of a pipe string according to of the invention and

14 shows two possibilities for the preparation of a paper web for the production of pipe strings according to the invention.

The illustrated embodiments all relate to the use of paper as a material web, although, as stated, also other suitable materials, which with regard to their nature, their behavior and / or their possible uses are equivalent or similar to paper.

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1 shows a tubular strand 10 produced according to the invention each with a smooth inner and outer wall, which is connected by a helical Winding a continuous paper web 2 is made forth, whereby adjacent paper web parts a, b, c, d, p ... develop.

This paper web 2, the width of which can be chosen arbitrarily and on the one hand according to the existing starting materials and on the other hand, according to the dimensions of the machine equipment for processing the paper web, is in a a device suitable for this purpose is provided at least over part of its width with corrugations 3, the height of which is substantially determines the strength of the raw strand wall. The shafts 3 are expediently produced by pushing them together the paper web, at least the corrugated paper web portion then remains out until the joining of the paper web in order to avoid regression due to the restoring forces of the paper.

The structure of the pipe string 10 can be seen in detail from FIGS. There are four adjacent track parts a, b, c, d the Fig. 1 can be seen, of which, however, only one is shown in full while parts of the other three are recognizable. The paper web is with a part of its width Shafts 3, six in the example shown, are formed by being pushed together in stages. This corrugation area is with 23, its width can be seen in FIG. On both sides of the waves 3 there is an unwaved, i.e. smooth side strip 21 and 22. The width of these side strips can also be seen in FIG. In this example, both are Side stripes 21 and 22 selected to be of the same width, but can they be? certainly also have different widths. The overall width the paper web is thus made up of the two side strips 21 and 22 and the corrugated area after the corrugations 3 have been applied 23 and is also indicated in FIG. The formation of the wave region 23 is in view of the following to choose helical winding so that one of the side strips, in the present case the right side strip 21,

above, and the other side strip, in the example shown the side strip 22, comes to lie below. This achieves d ate the two side strips 21 and 22 reach over or under the respectively adjacent paper web part and its wave region 23 cover. By applying glue to the outside of the heads or feet (extremes) of the shafts 3 as well as the inside or outside Outer sides of the appropriate places (i.e. at the distance of the wave division) of the overlapping shoulder strips and exercise appropriate Pressure, the side strips 21 and 22 are glued to the waves 3, so that the wave regions'23 in this way are dimensionally stabilized and a regression of the waves due to the restoring forces of the paper is not possible.

From the detail shown in FIG. 3 on an enlarged scale III-III of Fig. 2 is the location of the individual layers and parts Even better recognizable in the finished pipe string. Overall, here are parts of the four neighboring track parts a, b, c, d of the track 2 can be seen, with the respective reference numerals of a paper web part in each case the corresponding letter of the respective paper web part assigned.

A wave region 23c is followed on the right by a wave region 23d and on the left a wave area 23b by nestling the last wave in each case. In this contact or nestling area the flanks should also advantageously be glued. The wavy portion 23c is on one side of the upper side strip 21b of the left adjacent paper web part b and on the other side of the lower one Side strips 22d of the right adjacent paper web part d completely covered. As a result of the selected width of the side margins 21 and 22 larger than the width of the wave portion 23 becomes the one covering the wave portion 23c at the top Side strip 21b still partially covered by the next side strip 21a of the paper web part a located to the left of it, while it in turn overlaps the upper side strip 21c lying adjacent to it on the right. Also in these overlapping areas bonding takes place. It is the same with regard to the

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decreasing side strip 22, so that the side strip 22d covers the side strip 22c located to the left thereof.

In Fig. 2 and 3, the pitch of the helix is indicated. A significant part of the width of the paper web is used for covering of the wave region 23, so that in this embodiment results in a closed, smooth inner and outer wall. The inner wall is made up of the side strips on top 21, the outer wall through the side strips below 22 determined.

The embodiment of FIGS. 4 and 5 essentially has, in particular with regard to the regions 23 covering the shaft Side strips 21 and 22, the same structure as the example of Figs. 2 and 3; there is only one difference insofar than in Fig. 4 and 5 the corrugations of adjacent paper web parts partially interlocking, namely here - a pair of shafts 3b, Cc This results in an even stronger and more durable Possibility of connecting adjacent paper web parts a, b, c, d.

Fig. 6 shows a pipe string 11 which has a smooth inner wall and has a wavy AiaS contour. Details of this pipe string 11 are shown in detail in FIGS. 7 and 8. As can be seen, this version is only an overhead side strip 21 is provided, while the corrugated area 23 is formed up to the other edge of the paper web 2 Is. An interlocking in the edge area is provided here only for one shaft, as can be seen in particular from FIG recognizes «, the inner wall of the pipe string 10 is tenstrelfen 21a, 21b, 21c determined, some of which are doubled overlap. The outer contour results from the waves 2 3b, 23c, 23d. Gluing can be done in this embodiment so only in the area of the inner wall and the overlapping one Wave ranges take place. Such pipe strings can be used when certain deformations of the outer contour accepted or possibly even intended are.

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Fig. 9 shows a pipe string 12 with a smooth outer wall and a corrugated inner wall structure. As can be seen from the detailed representations of FIGS. 10 and 11, there is practically only one 180 ° rotated arrangement compared to the embodiment 7 and 8, wherein instead of the overhead side strips 21 shown there, non-corrugated underneath side strips 22 cover and wear the wave regions 23 towards the outside.

This embodiment is advantageous, for example, in those applications in which a deformability of the internal structure It is desirable, e.g. in the case of bottle packaging or pipe jacketing, to avoid certain fluctuations in the diameter of the jacketed To be able to compensate parts.

FIG. 12 shows an embodiment in which a pipe string 13 is made from two-ply paper web material. Such multi-layer pipe strings have a very high strength Wall and are accordingly highly resilient to pressure and secured against bending.

a 14

Fig. 13 shows an embodiment "Ves Rohrstranges ^ bhne smooth Side stripes, i.e. with shaped over the entire width of the paper web Waves. The corrugations of neighboring paper web parts grip in a way that depends entirely on the intended use, more or less large number into one another and thus form the interlocking connection. Since with such only corrugated Railways provisions of the waves due to the nature of the material are unavoidable, the paper web must in any case with a material application that ensures dimensional stability be provided.

14 shows a preparation stage for the paper web, here with it their total width 2, again in two variants. This preparation takes place before the wave profiles are created and consists in that the paper web 2 is knurled over part of its width or over the entire width. Such The knurling consists of a very tight gathering of the paper in order to

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with regard to the later winding to helical coils resulting differences in the inner and outer walls to know how to compensate for the forces that occur. By ei no such knurling are created nominal compression stellon. they are required in the area of the inner parts of the paper web in the finished pipe string, since this is where the highest compressive forces occur, while in the outdoor area tensile forces in the measure of the tensile strength of the paper material used can be accommodated without, however, the paper being subject to stretching. Rather, if the tensile strength is exceeded, tearing occurs immediately. This is counteracted by the knurling by namely a higher degree of compression can be achieved inside,

Force ratios as a result of the so that the ^ differences in diameter are reasonable can be compensated. In the upper part only partial knurling 41 is shown, which extends over the width of the inside lying side strip 21 and the width of the later wave area 23 extends. The width of the side strip 22 lying on the outside of the finished pipe string is only slightly influenced.

But it is also possible to use the knurling as the total paper web width 2 overlapping knurling 42 to form, as a Sol-Stauchtsng brings hardly any disadvantages in the area of the outer shoulder 22. The choice between the knurling 41 and 42 largely depend on the tools available.

14 shows the principle of wave profile formation specified. The paper web 2 is pushed together transversely to its longitudinal direction, that is, in the direction of the arrows Ä ", so that in Waves running in the longitudinal direction of the paper web arise in the area 23. As the paper web runs lengthways through the machine is running, the waves can only be generated in stages, i.e. it is not possible to generate all the waves occupying the wave width 23 at the same time, but this must be done one after the other happen in order to be able to control the pull-in forces in a reasonable way.

Claims (22)

3H6371. ::. ·. · '· ■ - 1. Günter Schäfer, Kantstrasse 54, 6238 Hofheim 2. Europa Carton Aktiengesellschaft, Spitaler Strasse 11, 2000 Hamburg 1st From a continuous, helically wound Web of tubing made from paper, cardboard or similar material and process for its manufacture Patent claims: 1. From a continuous, helically wound th web made of paper, cardboard or similar material pipe string, whereby to form the pipe string wall Edge areas of the web overlap and are firmly connected to one another, characterized in that that the web (2) over at least part of its width with a plurality parallel to each other lying, with its main extent in the longitudinal direction of the Formed path and the helix of aligned shafts (3) is. 2. Pipe string according to claim 1, characterized in that that each part of the two outer shafts (3) from the parts of the web (2), the lie next to one another in the overlap area, in the flank area touched and connected there. 3. Pipe string according to claim 1, characterized in that that in each case at least one of the waves (3) lying next to one another in the overlapping area Parts (a, b, c, d) of the web (2) are in engagement with at least one shaft of the neighboring part of the web. 4. Pipe string according to claim 1 or 3, characterized in that that the waves (3) over the entire 31463/1 Web width are arranged and at least the two outer waves of adjacent web parts interlocking overlap. 5. Pipe string according to one of claims 1 to 3, characterized in that the web (2) at least on one side of the waves (3) has a non-corrugated side strip (21, 22), which at least part of the waves of the covers adjacent part of the track and is connected to the wave heads. 6. Pipe string according to claim 2, 3 or 5, characterized characterized in that the web (2) on both sides of the corrugations (3) each with a non-corrugated side strip (21 and 22), one of which (21) is the inside of the one adjacent track part and the other (22) overlaps the outside of the other adjacent track part or covers. 7. Pipe string according to one of claims 1 to 6, characterized in that the web. (2) at least in the area of the waves (3) with a material-stiffening application of wax, a thin plastic film or the like. coated or is soaked. 8. Pipe string according to one of claims 1 to 7, characterized characterized in that the web (2) at least in the region of the parts forming the inner wall of the tube such as corrugations and / or internal overlapping with knurling extending essentially transversely to the longitudinal direction of the web (41, 42) is provided. 9. pipe string according to one of claims 1 to 8, characterized in that the pipe string wall at least two superimposed, helically wound and with in the longitudinal direction of the helix running waves provided paths is formed. 10.-j method for producing a continuous, from one continuously running web of paper, cardboard or similar material helically wound tubular stranaes, characterized in that the
Railway to itself over at least part of its width
waves extending in their longitudinal and drainage directions
deformed and partially overlapping and joining
their side edges is joined to the Rohrstranqwandung. 11. The method according to claim 10, characterized that the train is at least on one Part of its width is pre-deformed, e.g., knurled, essentially transversely to its longitudinal direction. 12. The method according to claim 10 or 11, characterized in that the waves by together
push the web formed transversely to its longitudinal extension
will. 13. The method according to claim 12, characterized in that the wave formation takes place in stages. 14. The method according to claim 13, characterized that the wave formation is gradually synmio trically, starting in the middle of the track. 15. The method according to claim 13, characterized in that the wave formation is asymmetrical
he follows. 16. The method according to any one of claims 10 to 15, characterized in that the web is at least in
Area of the waves with a stiffening material such as wax, solidifying liquid plastic or the like. soaked,
is coated or provided in a similar manner. 17. The method according to any one of claims 10 to 16, characterized in that the web in the overlapping areas before the helical winding is at least partially provided with adhesive and glued. 18. The method according to any one of claims 10 to 17, characterized characterized in that the corrugations are formed over part of the width of the web such that a smooth side strip remains on one of the two sides of the web, which is the entire width of the corrugation reaches over or under the adjacent part of the track. 19. The method according to any one of claims 10 to 17, characterized characterized in that the corrugations are formed over part of the width of the web so that to a smooth side strip remains on both sides of the web, with one of the side strips being adjacent to it Reaches under the track part and the other side strip engages over its adjacent track part. 20. The method according to claim 18 or 19, characterized that the waves are covered with glue in the area of their heads and with those that overlap Adjacent web strips are glued. 21. The method according to any one of claims 10 to 20, characterized characterized in that at least two webs are wound over one another after the formation of the waves and with one another get connected. 22. The method according to any one of claims 10 to 21, characterized characterized that the pipe string wall on its inside and / or outside with a smooth paper or film web is covered.