WO2008132120A1

WO2008132120A1 - Method for the production of a metal-reinforced plastic composite pipe and metal-reinforced plastic composite pipe

Info

Publication number: WO2008132120A1
Application number: PCT/EP2008/054952
Authority: WO
Inventors: Eberhard Kertscher
Original assignee: The Thomas Machines S.A.
Priority date: 2007-04-27
Filing date: 2008-04-23
Publication date: 2008-11-06
Also published as: DE112008001067A5; CH703688B1; DE112008001067B4

Abstract

The invention relates to a metal-reinforced plastic composite pipe, a device for producing the same, and a method for production comprising the following steps: a) providing a plastic pipe (10); b) feeding a metal strip (11) to the vicinity of the outer circumference of the plastic pipe (10); c) deforming the metal strip (11) such that it surrounds the plastic pipe (10) in some regions in a C shape, spaced from the outer circumference thereof; d) applying a first adhesive layer (12) onto the outer circumference of the plastic pipe (10); e) deforming the metal strip (11') having a C-shaped cross-section into a metal pipe (14) surrounding the plastic pipe (10), the longitudinal edges (13, 15) of the metal pipe (14) overlapping each other; f) applying a second adhesive layer (16) onto the outer circumference of the metal pipe (14); g) compressing the metal pipe (14) in the radial direction in order to press the inner circumference of the metal pipe (14) onto the outer circumference of the plastic pipe (10) provided with the first adhesive layer (12); h) extruding a plastic casing (18) on the outer circumference of the metal pipe (14) provided with the second adhesive layer (16).

Description

Method for producing a metal reinforced plastic composite pipe and metal I reinforced plastic composite pipe

TECHNICAL AREA

The present invention relates to a method for producing a metal-reinforced plastic composite pipe and a metal-reinforced plastic composite pipe produced by this method. Furthermore, it relates to a device with which this method can be carried out.

STATE OF THE ART

Commercially available and generally known are metal I reinforced plastic tube, also called composite pipes, which consist of several layers, of which at least one layer of metal is formed. Due to its significantly lower thermal expansion compared to plastic, this metal layer ensures a significantly improved length consistency with temperature fluctuations compared with a plastic pipe.

In these known composite pipes, an adhesive is applied to a plastic inner tube and the adhesive layer is used to form a metal sheath which is welded together into a tube and consists of aluminum or steel. In order to achieve a good adhesion of the metal tube on the outer peripheral surface of the inner plastic tube, the welded metal tube is compacted after application to the plastic tube, so radially compressed, so that it rests evenly over its circumference on the plastic tube. After this mechanical compaction, the metal tube is heated to the extent that the underlying adhesive melts and so glued the inner plastic tube to the outer metal tube. Subsequently, another on the metal tube Adhesive layer and applied to it a plastic layer. Such composite pipes are gas-tight, can be bent without forming wrinkles, and are stabilized in the longitudinal direction in contrast to a plastic tube. This means that when heated only a small axial expansion occurs. Disadvantage of such composite pipes, however, is the relatively high production price.

Furthermore, composite pipes are known and available on the market, which are also provided with a thin-walled metal tube, but this metal tube is not welded, but is formed around the inner plastic tube around, with the longitudinal edges of the metal tube either overlap or abutment abutting , The manufacturing process of these known composite pipes is similar to the manufacturing process described above, but a compaction is not possible as in the welded composite pipes.

It is also known to press the heated metal tube onto the plastic pipe, or to use an already coated with an adhesive or a copolymer metal, which is heated and pressed onto the inner plastic tube.

PRESENTATION OF THE INVENTION

Object of the present invention is to provide a method for producing a metal-reinforced plastic composite pipe, which allows the cost-effective production of metal-reinforced plastic composite pipes. Furthermore, it is an object of the present invention to provide a corresponding inexpensive producible metal I reinforced plastic composite pipe.

The object relating to the method is solved by the features of patent claim 1. According to the invention, the method for producing a metal-reinforced plastic composite pipe has the steps specified in claim 1, in particular:

a) providing a plastic tube; b) feeding a metal strip near the outer circumference of the plastic tube; c) deforming the metal strip such that it partially surrounds the plastic tube spaced from its outer circumference C-shaped; d) applying a first adhesive layer to the outer circumference of the

Plastic pipe; e) deforming the cross-sectionally C-shaped metal strip to a the

Plastic pipe surrounding metal tube, the longitudinal edges of the

Metal tube overlap each other; f) applying a second adhesive layer to the outer circumference of the

Metal pipe; g) Compressing the metal tube in the radial direction to the inner circumference of

Metal tube on the provided with the first adhesive layer outer circumference of the plastic tube to press; h) extruding a plastic sheath onto the outer circumference of the metal tube provided with the second adhesive layer.

ADVANTAGES

This method makes it possible to produce metal-reinforced plastic composite pipes in a simple, cost-effective manner, which are reliably stabilized in the longitudinal direction and have only a very small elongation compared to a pure plastic pipe.

It is particularly advantageous if, during the application of the second adhesive layer in step f), the adhesive is also introduced between the mutually overlapping longitudinal edge regions of the metal tube, so that after Curing or solidification of the adhesive and the metal tube is stabilized in the circumferential direction.

Alternatively, however, the overlapping longitudinal edge regions of the metal tube can also be welded together in an additional method step i), in particular by means of a laser welding method.

The step of compressing the metal tube in the radial direction in step g) is carried out according to the invention in an annular compression nozzle. Such a compression nozzle allows the continuous production of the plastic composite pipe according to the invention with exact constancy of Au ßendurchmessers.

The application of at least a portion of the second adhesive layer in step f) is carried out according to the invention immediately before the compression nozzle for compressing the metal tube. The application of the adhesive in front of the compression nozzle causes the adhesive to act as a lubricant upon passage of the metal tube inner plastic tube through the compression nozzle so as to allow low friction passage of the metal tube inner plastic tube through the compression nozzle Pass through the compression nozzle and thus a higher production speed can be achieved.

In this case, the application of the second adhesive layer in step f) preferably takes place by means of two flow paths, whose mouth regions extend to the outer circumference of the

Metal tube are spaced apart in the axial direction. In this case, a first flow path can open directly in front of the compression nozzle to the outer circumference of the metal tube, and a second flow path opens inside or behind the compression nozzle.

Preferably, the unit of plastic pipe and metal pipe provided with the adhesive layers is heated as it passes through the compression nozzle. As a result, the partially already frozen or tough Adhesive of the first adhesive layer heated and re-softened and reactivated, so that the bonding of the inner tube is ensured with the metal tube.

It is particularly preferred if the method is carried out continuously with continuous advancement of the inner plastic tube and the metal strip. The metal strip can be unwound, for example, from a spool. To ensure uninterrupted operation, provision may be made for allowing the tape end of a fully unwound spool to be connected to the tape leader of a new spool.

The order of steps b), c) and d) given in claim 1 is not necessarily chronological, but step d) may also be carried out before step c) or before step b).

The object of the plastic composite pipe is achieved by the specified in claim 11 metal-reinforced plastic composite pipe.

This plastic composite pipe consists of a radially inner plastic tube whose outer circumference is firmly bonded to the inner circumference of a metal tube, wherein the longitudinal edges of the metal tube overlap each other and glued or welded together and wherein a plastic jacket surrounds the outer periphery of the metal tube and is glued thereto. Such a metal-reinforced plastic composite pipe is inexpensive to manufacture continuously and has a high after curing or solidification of the adhesive

Longitudinal stability and circumferential stability.

Preferably, the metal tube is formed from a perforated metal sheet. This variant of the plastic composite pipe according to the invention makes it possible that, when a gas diffusion through the wall of the plastic composite tube inside gases formed can pass freely through the holes of the metal shell to the outside, so that the formation of gas bubbles in the wall under the metal shell is avoided , An apparatus for producing a metal-reinforced plastic composite pipe according to the method of the invention is specified in claim 13.

Advantageous developments are specified in the subclaims.

The invention is explained in more detail below by means of an example with reference to the drawing:

BRIEF DESCRIPTION OF THE DRAWINGS

In this shows:

Fig. 1 is a perspective view of a partially cut metal reinforced plastic composite pipe according to the invention;

FIG. 2 shows a cross section through the metal-reinforced plastic composite pipe according to FIG. 1; FIG.

2A shows an enlarged detail of a cross section through the metal-reinforced plastic composite pipe according to FIG. 1 in an alternative embodiment;

Fig. 3 is a perspective view of an alternative embodiment of the metal reinforced plastic composite pipe according to the invention;

4 shows a schematic representation of a production line for the production of the metal-reinforced plastic composite pipe according to the invention by the method according to the invention;

5 shows a longitudinal section through a third manufacturing stage of the production line shown in FIG. 4; 6 shows a cross section through the third manufacturing stage of FIG. 5 in FIG

Direction of material flow seen;

Fig. 7 shows a longitudinal section through the compression stage of the production line of FIG. 4 and

8 shows an enlarged detail from FIG. 7.

PRESENTATION OF PREFERRED EMBODIMENTS

Fig. 1 shows a perspective view of a partially cut metal I reinforced plastic composite tube 1 according to the present invention with an inner plastic tube 10, an applied on the outer circumference of the inner plastic tube 10 first adhesive layer 12, one applied to the first adhesive layer 12, the inner plastic tube 10 surrounding metal tube 14, a surrounding the outer periphery of the metal tube 14 second adhesive layer 16, and a force applied to the second adhesive layer 16, the metal tube 14 surrounding the plastic sheath 18th

As can be seen from the cross-sectional illustration of the plastic composite pipe 1 shown in FIG. 1 in FIG. 2, the longitudinal edges 13, 15 of the metal jacket 1 1 bent from a metal strip 11 to the metal pipe 14 overlap one another, wherein between the longitudinal edges 13, 15 adjacent longitudinal edge portions of the metal tube 14 adhesive 17 from the first adhesive layer 12 and / or the second adhesive layer 16 has penetrated. In this way, not only the metal tube 14 with the inner plastic tube 10 and the outer plastic sheath 18 are bonded by the two adhesive layers 12, 16, but the metal tube not welded together at its longitudinal edges obtained by the adhesive 17 after curing the desired metal tube stability.

FIG. 2A shows an enlarged detail from a cross-sectional view, which corresponds to the view of FIG. 2. However, it is a variant in which no adhesive has penetrated between the overlapping longitudinal edge regions of the metal tube 14. The overlapping longitudinal edge areas are virtually free of play on each other and are welded together by means of a laser. In cross section, the weld 19 is visible.

The illustrated in Fig. 3 alternative embodiment of the plastic composite pipe 1 'according to the invention corresponds in construction to the plastic composite pipe 1 shown in Fig. 1, but wherein the metal tube 14' is formed of a perforated metal sheet and so distributed in the longitudinal direction and over the circumference These holes 14 "allow gas diffusion through the wall of the plastic composite tube, allowing gases formed inside to pass outwardly through the holes of the metal shell, thus creating gas bubbles in the wall is avoided under the metal jacket.

FIG. 4 shows a production line 100 for producing a plastic composite pipe 1 according to the method according to the invention. Instead of the plastic composite pipe 1 can be on this production line 100 and the metal-reinforced plastic composite pipe 1 'finished.

The production line 100 consists of a first section 101, in which the deformation steps take place, and a second section 102, in which the extrusion of the plastic jacket takes place. The first section 101 has a mechanical substructure 103 on which the individual production stations are mounted. The second section 102 also has a mechanical substructure 104 on which the extruder 105 is mounted. The material passage takes place in the production line 100 in FIG. 4 from right to left and is symbolized by the arrow M.

In material flow direction M, in the first section 101 of the production line 100 (in FIG

Fig. 4 from right to left) initially provided a first manufacturing stage 1 10. The first manufacturing stage 1 10, the plastic tube 10 and the metal strip 1 1 are supplied from the right. In this first manufacturing stage 1 10, the metal strip 11 brought close to the outer periphery of the plastic tube 10 and aligned in a parallel transport position to the axis X of the plastic pipe 10.

The plastic pipe 10 and the metal strip 11 then pass through a second manufacturing stage 120 in which the metal strip 1 1 passes through several roll forming devices 121, 122, 123 and 124 and is deformed into a bent metal strip 11 'having the shape of a horizontal "C" , which partially surrounds the plastic tube 10 (see Fig. 6). The roll forming devices may be arranged horizontally or vertically.

The plastic tube 10 emerging from the second production stage 120 and the metal band 11 'deformed in the second manufacturing stage 120 then enter a third production stage 130 of the first section 101 of the production line 100. The third manufacturing stage 130 is shown in detail in FIGS. 5 and 6.

FIG. 5 shows, partially in section, an adhesive applicator 131 to which a first adhesive C1 is fed in a manner known to those skilled in the art. The adhesive C1 is heated in a heating head of the adhesive applicator 131 to a temperature of about 220 ° C and passed to a below the heating head 132 applicator sleeve 133 through which the plastic tube 10 passes.

The applicator sleeve 133 is provided over its circumference with a plurality of passage openings 134 which open into an annular space 135 which is formed between the outer periphery of the plastic tube 10 and the inner periphery of the applicator sleeve 133. On the rear side of the applicator sleeve 133 facing away from the annular space, the passage openings 134 are connected to an adhesive channel 136 in the interior of the heating head 132. In this way, the heated in the heating head 132 adhesive flow through the through holes 134 in the annular space 135 through which the plastic tube 10 passes. The plastic tube 10 is wetted at its outer periphery with the adhesive C1.

The bent metal strip 1 1 'runs below the adhesive applicator 131 past this. In a fourth production stage 140 following the third production stage 130, a further deformation of the bent metal strip 11 'takes place in such a way that the metal strip 11' is formed into a metal tube 14 surrounding the plastic tube 10 provided with the first adhesive layer 12. The longitudinal edges 13, 15 of the metal tube overlap each other. In a modified variant, two or more of the fourth production stages 140 are provided one behind the other.

The plastic tube 10 emerging from the fourth production stage 140 and provided with the first adhesive layer 12, and the metal tube 14 surrounding it, subsequently enter a fifth production stage 150, which is described in more detail below in connection with FIGS. 7 and 8. Even before the entry of the plastic tube 10 with the metal tube 14 in the 5th manufacturing stage 150 can be applied in the region of the longitudinal edges 13, 15 of the metal tube adhesive later in the space between the overlapping

Longitudinal edge areas of the metal tube ensures that they stick together. The application of adhesive to the longitudinal edges of the metal tube 14 can also be done in the entrance area of the 5th manufacturing stage using the adhesive applicator 151. If the overlapping longitudinal edge regions of the metal tube are to be welded later, no adhesive is introduced in the interspace between the overlapping longitudinal edge regions of the metal tube.

The third fabrication stage 130, the fourth fabrication stage (s) 140, and the fifth fabrication stage 150 are immediately, ie, without significant spacing therebetween, one behind the other, such that a decrease in the adhesiveness of the adhesive of the first adhesive layer applied in the third fabrication stage to the second fabrication stage Passing through the fifth manufacturing stage 150 (for example, by setting) is minimized. The fifth fabrication stage 150 shown in FIG. 7 has an adhesive applicator 151 which is substantially the same as the adhesive applicator 131 of the third fabrication stage and to which an adhesive C2 is supplied. The adhesive C2 may be the same adhesive as the adhesive C1 or may be another Be adhesive. The adhesive applicator 151 is provided with a heating head 152 which heats the adhesive C2 to a suitable flow temperature, for example also 220 ° C. Below the heating head 152, the adhesive applicator 151 is provided with an application and compression device 153. The application and compression device 153 has a sleeve-like construction and the metal tube 14 and the plastic tube 10 provided with the first adhesive layer 12 pass through the sleeve-like application and compression device 153. The application and compression device has a sleeve-like housing part 154, which is provided with a radial adhesive channel 155 which is in fluid communication with an adhesive channel 156 in the heating head 152.

The inner peripheral surface of the sleeve-like housing part 154 is formed in a cone shape with a decreasing diameter in the material flow direction M. In the sleeve-like housing part 154, an inner conical sleeve 157 is used, which is formed on its outer circumference so conical that they against the

Inner cone of the sleeve-like housing part 154 can be brought to bear. The inner conical sleeve 157 has an axial passage opening of constant diameter, wherein the diameter is larger than that of the metal tube 14. The inserted into the sleeve-like housing part 154 inner conical sleeve 157 is screwed by a screwed into the rear opening of the sleeve-like housing part 154 threaded sleeve 158 against the pressed conical inner surface of the sleeve-like housing part 154 and fixed in this way.

In the material flow direction behind the front portion of the inner tapered sleeve 157 (in Fig. 7, left thereof), an adhesive application and compression structure 159 is provided, which will be described below with reference to FIG.

8 shows the front portion of the application and compression device 153 in an enlarged view. The inner conical sleeve 157 is located with its front in the direction of material flow M at the end

Adhesive application and compression structure 159 on. This has an annular nozzle body 160, whose inner diameter, starting from the inner diameter of the inner cone sleeve 157 in the material flow direction conically tapered to an inner diameter which is slightly larger than the outer diameter of the supplied metal tube 14th

In the region of the taper of the inner diameter of the annular nozzle body 160 is provided with an inner circumferential groove 161, in which a plurality of

Adhesive channels 162 open, which are arranged distributed over the circumference and penetrate the annular nozzle body 160 substantially radially. On the radially outer rear side of the adhesive channels 162, these are in communication with a plurality of adhesive supply channels 163 formed between the conical outer periphery of the inner tapered sleeve 157 and the conical inner periphery of the sleeve-like housing portion 154, and on their rearward side into an outer circumferential groove 164 of the inner Conical sleeve 157 open, which is in fluid communication with the adhesive channel 155.

The adhesive C2 may therefore flow from the adhesive channel 155 via the outer annular groove 164 in the Klebstoffzuführkanäle 163 and through the adhesive channels 162 in the inner annular groove 161, from which the adhesive C2 reaches the outer periphery of the metal tube 14 and wetted.

Due to the viscosity of the adhesive layer lying on the outside of the metal tube, which moves further through the compression nozzle together with the metal tube, a hydrodynamic pressure builds up, which ensures that air present between the overlapping longitudinal edges 13, 15 of the metal tube 14 is pressed out. Eventually when the tube enters the application and compression device 153 still existing game is eliminated, and the in Fig.

2A drawn in extension L of the pipe of the area in which overlap the longitudinal edges 13, 15 of the metal tube 14, increases accordingly.

The applied on the outer circumference of the metal tube 14 adhesive acts during

Passing through the metal tube 14 by the first section 165 of the compression nozzle following the inner circumferential annular groove 161 and the subsequent second section 168 of the compression nozzle, that is the area of the Adhesive application and compression structure 159 with narrowest diameter, as a lubricant. In this way, a friction between the metal tube 14 and the compression nozzle 165, 168 is reduced or at least significantly reduced. The adhesive acts here not only as a lubricant, but also ensures due to the above-mentioned hydrodynamic pressure for a self-centering of the tube 14 in the compression nozzle 165, 168. A direct contact of the metal tube 14 with the inner walls of the compression nozzle 165, 169 is thus in avoided in any case, and caused by mechanical friction abrasion of the metal tube on its outer surface can not occur. When passing through the metal tube 14 through the compression nozzle 165, 168, the metal tube is radially compressed so that the metal tube 14 is firmly pressed against the plastic tube 10 located on the first adhesive layer 12 and thus connected to the plastic tube 10 to a tube unit 19. During radial compression, the metal tube is simultaneously heated by means of a resistance heater, designated 169.

In the material flow direction M behind the first section 165 of the compression nozzle (that is to say in FIG. 8 to the left thereof), a further annular groove 166 is formed on the inner circumference of the adhesive application and compression structure 159. This further inner circumferential annular groove 166 is in fluid communication with the adhesive supply channels 163 via an annular adhesive channel 167 running obliquely to the longitudinal axis X. In the embodiment shown in FIGS. 7 and 8, both the first inner circumferential annular groove 161 in the material flow direction M and the second inner circumferential annular groove 166 communicate with the adhesive channel 155 and are supplied with adhesive C2 from a common source.

However, it is also possible to provide for the two successively arranged Innenumfangsringnuten 161, 166 each have their own supply of adhesive, for example via two independent extruder. Through the annular adhesive channel 167 and the further Innenumfangsringnut 166 is on the outer circumference of the tube unit 19 after passing through the first

Section 165 of the compression nozzle adhesive applied evenly over the entire circumference of the tube unit 19, so that on the outer circumference of the metal tube 14, a second adhesive layer 16 is formed. The amount of here applied adhesive can be adjusted by adjusting the opening cross-section of the annular adhesive channel 167 to achieve a desired layer thickness of the adhesive. As a result, the thickness of the adhesive layer applied to the outer circumference of the metal tube 14 in the region of the first annular groove 161 can be readjusted. This second adhesive layer also acts as a lubricant when passing through the adjoining second section 168 of the compression nozzle. With a correspondingly thick adhesive layer, any irregularities in the outer diameter of the metal tube are compensated.

The compression nozzle 165, 168, preferably its second portion 168, may be heated, for example by a resistor, to heat and re-soften the adhesive of the first adhesive layer 12 by heating the composite tube passing through the compression nozzle herein its adhesive ability to reactivate. Some heating already occurs due to the friction between the lubricant acting as a lubricant, the metal tube 14 and the inner walls of the compression nozzle 165, 168. In particular, with a high viscosity of the adhesive and a sufficient length of the portion 168 in the nozzle, the resulting friction can contribute to a heating of the adhesive and thus to an activation of its adhesiveness.

In the material flow direction M behind the fifth manufacturing stage 150, that is to say in FIG. 4 to the left of this, a welding device 170 is optionally provided. After the exit of the tube unit 19 from the application and shown in Fig. 8

Compression means 153, the two overlapping longitudinal edge regions of the metal tube 14 by means of this welding device 170 are welded together. Preferably, the welding device 170 comprises a laser which welds the two overlapping longitudinal edge regions through the outer adhesive layer.

The tube unit 19 provided with the second adhesive layer 16 then enters the extruder 105, in which the second adhesive layer 16 a Plastic jacket 18 is extruded. After passing through the extruder 105, the plastic composite pipe 1 according to the invention is completed.

As has already been stated, instead of the closed metal strip 11, a perforated metal strip may also be used, which is then formed into the perforated metal tube 14 'as shown in FIG. 3, wherein the above-described method steps for producing the plastic composite tube 1 are the same as for the plastic composite pipe 1 'with perforated metal pipe 14'.

The invention is not limited to the above embodiment, which merely serves to generally explain the essence of the invention. Within the scope of protection, the device according to the invention may also assume other than the above-described embodiments. In this case, the device may in particular have features that represent a combination of the respective individual features of the claims.

Reference signs in the claims, the description and the drawings are only for the better understanding of the invention and are not intended to limit the scope.

Claims

claims

Anspruch [en] A method of making a metal-reinforced plastic composite tube comprising the steps of: a) providing a plastic tube (10); b) feeding a metal strip (1 1) in the vicinity of the outer periphery of the plastic tube (10); c) deforming the metal strip (1 1) such that it surrounds the plastic tube (10) spaced from its outer circumference C-shaped partially; d) applying a first adhesive layer (12) on the outer periphery of the plastic tube (10); e) deforming the cross-sectionally C-shaped metal strip (11 ') to a plastic tube (10) surrounding the metal tube (14), wherein the longitudinal edges (13, 15) of the metal tube (14) overlap each other; f) applying a second adhesive layer (16) to the outer periphery of the metal tube (14), wherein at least a portion of the second adhesive layer (16) is applied immediately before the compression nozzle (165, 168) for compressing the metal tube (14); g) radially compressing the metal tube (14) in an annular compression nozzle (165, 168) to press the inner circumference of the metal tube (14) onto the outer periphery of the plastic tube (10) provided with the first adhesive layer (12); h) extruding a plastic sheath (18) onto the outer circumference of the metal tube (14) provided with the second adhesive layer (16).

2. The method according to claim 1, characterized in that during the application of the second adhesive layer (16) in step f) adhesive also between the overlapping longitudinal edge regions of the metal tube

(14) is introduced.

3. The method according to claim 1, characterized in that it further comprises a method step i), wherein the overlapping longitudinal edges (13, 15) of the metal tube (14) are welded together.

5

4. The method according to claim 3, characterized in that the overlapping longitudinal edges (13, 15) of the metal tube (14) by means of a laser through an adhesive layer through each other l o verschwei ÃŸ be.

5. The method according to claim 4, characterized in that

15 the application of the second adhesive layer (16) in step f) by two

Flow paths (162, 161, 167, 166) takes place, the mouth areas are spaced from each other to the outer circumference of the metal tube (14) in the axial direction.

6. The method of claim 3, 4 or 5, characterized in that the adhesive layers (12, 16) provided with the unit made of plastic pipe (10) and metal tube (14) when passing through the compression nozzle (165, 168) is heated.

25

7. The method according to any one of the preceding claims, characterized in that the method is carried out continuously under continuous feed of the plastic composite pipe (10) and the metal strip (1 1). 30

8. The method according to any one of the preceding claims, characterized in that the step d) before step c) is performed.

9. The method according to any one of claims 1 to 7, characterized in that the step d) before step b) is performed.

10. The method according to any one of claims 1 to 7, characterized in that the step i) after the steps f) and g) is performed.

11. Metal reinforced plastic composite tube consisting of a radially inner plastic tube (10) whose outer circumference with the inner circumference of a metal tube (14) is firmly bonded, wherein the longitudinal edges (13,15) of the metal tube (14) overlap each other and glued together or are welded and wherein a plastic sheath (18) the outer periphery of the

Metal tube (14) surrounds and is glued to this.

12. Metal reinforced plastic composite pipe according to claim 1 1, characterized in that the metal tube (14) is formed of a perforated metal sheet.

13. An apparatus for producing a metal-reinforced plastic composite pipe with a method according to any one of claims 1 to 9 with a first feed device for a plastic pipe (10); - A second feed device for a metal strip (1 1); a first manufacturing stage (1 10), which positions the metal strip (1 1) and the plastic tube (10) relative to each other; a second manufacturing stage (120) having at least one deforming means (121, 122, 123, 124) for the metal strip (11); a third manufacturing stage (130) having a first adhesive applicator (131) adapted to allow the plastic tube to pass through the first adhesive applicator (131); at least a fourth manufacturing stage (140) having a further deformation means for the already partially deformed metal strip, a fifth manufacturing stage (150) comprising a second adhesive applicator (151) formed so that the plastic tube and the surrounding metal tube through the second adhesive applicator (151) can pass, and a compression means (159) for the plastic tube surrounding the metal tube; and an extruder (105) formed so that the composite of plastic pipe and metal pipe can pass through the extruder (131) and be provided there with a plastic sheath.

14. The apparatus according to claim 13, characterized in that the compression device (159) has a compression nozzle (165, 168) which, preferably with an electrical resistance, can be heated.

15. The device according to claim 14, characterized in that it further comprises a welding device (179), which between the fifth

Manufacturing stage (150) and the extruder (105) is arranged.