Belt type reinforced composite plastic pipe and production method thereof

Abstract

The invention relates to the technical field of pipeline production, and discloses a belt type reinforced composite plastic pipe and a production method thereof, the production method comprises a winding step of winding reinforcing belts (1) on a plastic core pipe (2) by utilizing a winding machine, the winding machine is provided with a plurality of belt reels for simultaneously releasing a plurality of reinforcing belts (1), and in the winding step, the reinforcing belts (1) are wound on the plastic core pipe (2). The reinforcing tape (1) released by the adjacent tape reels of the same winding machine is spirally wound on the plastic core tube (2) in an at least partially laminated manner. According to the production method, the multiple reinforcing layers can be formed on the periphery of the plastic core pipe after the plastic core pipe linearly moves forwards in the axial direction and penetrates through the winding machine, and the number of the winding machines needed in production of the belt type reinforced composite plastic pipe is effectively reduced. And meanwhile, the pipe does not need to be wound and unwound for many times in the production process, and a reinforcing layer can be conveniently formed by adopting a reinforcing belt with a wide belt width, so that high production efficiency and the quality of the prepared pipe can be ensured.

Description

Technical Field

[0001] The present invention relates to pipeline production technology, and in particular to a production method for a belt-type reinforced composite plastic pipe. Based on this, the present invention also relates to a belt-type reinforced composite plastic pipe produced by the production method. Background Art

[0002] Reinforced thermoplastic pipe (RTP) usually has a three-layer structure of inner layer, middle layer and outer layer, wherein the inner layer is a corrosion-resistant and wear-resistant thermoplastic core tube, the middle layer is a reinforcing layer for reinforcing effect, and the outer layer is an outer coating layer for protection. The middle layer can be formed by spirally winding a belt-shaped reinforcing material such as polyester fiber belt, glass fiber belt, metal ribbon, metal belt, etc. on the plastic core tube of the inner layer. Due to its good corrosion resistance, high temperature resistance, light weight, easy installation and other advantages, and high tensile, compressive and bending strength, it can withstand large loads. RTP pipes are widely used in the fields of oil extraction and injection, gathering and transportation, long-distance transportation, marine engineering, etc., and it can be used to replace traditional steel pipes, glass fiber reinforced plastic pipes and other materials, and has broad market prospects.

[0003] In the production process of such belt-reinforced composite plastic pipes, the plastic core pipe can be extruded to move straight along its axial direction and pass through a winding machine with a belt reel. The winding machine rotates around the plastic core pipe, so that the reinforcement belt released by its belt reel is spirally wound around the outer periphery of the plastic core pipe to form a reinforcement layer composited to the outer peripheral wall of the plastic core pipe. Usually, each winding machine has a plurality of (such as four, six, eight, etc.) belt reels, and accordingly the winding machine can be called a "four-reel belt winding machine", "six-reel belt winding machine", etc. During operation, these belt reels simultaneously release the wound reinforcement belt, thereby having a higher production efficiency.

[0004] Take the production method of using a four-reel winding machine as an example. Figure 1 and Figure 2 As shown, the reinforcing tape 1 released by the four-reel tape winding machine is spirally wound onto the plastic core tube 2. For ease of explanation, Figure 1 The figure shows a situation where only one reinforcement tape 1 is spirally wound. The reinforcement tape 1 is wound on the outer peripheral wall of the plastic core tube 2 at a pitch P, with winding gaps 4 between adjacent spirals. Figure 2The figure shows a situation where four reinforcing tapes 1 released from four reels of the same winding machine are spirally wound, that is, the first reinforcing tape 11 is wound on the outer peripheral wall of the plastic core tube 2 at a pitch P, with a winding gap 4 between adjacent spirals, and the second reinforcing tape 12, the third reinforcing tape 13, and the fourth reinforcing tape 14 are wound in the winding gap 4 between adjacent spirals of the first reinforcing tape 11 at the same pitch P, so that when the plastic core tube moves straight along its axial direction and passes through the four-reel winding machine, a reinforcing layer can be formed on the outer periphery of the plastic core tube 2. Among them, different reinforcing tapes can be adjacent to each other or have gaps.

[0005] In order to make the belt-type reinforced composite plastic pipe meet the performance requirements, multiple winding machines need to be configured. For example, when 20 reinforcement layers need to be formed on the outer circumference of the plastic core pipe 2, 20 winding machines need to be configured accordingly. However, this not only requires huge equipment investment, but also occupies a large production site. Alternatively, if fewer winding machines, such as four, are used, the pipe needs to be wound and unwound and passed through each winding machine five times, which seriously affects the production efficiency and pipe quality. Summary of the invention

[0006] The purpose of the present invention is to overcome the problems of large equipment investment and large production site area in the prior art of the belt-type reinforced composite plastic pipe production line, and to provide a production method for belt-type reinforced composite plastic pipes. The production method can effectively reduce the number of winding machines required in the production of belt-type reinforced composite plastic pipes, greatly improve production efficiency, and will not affect the quality of the pipe.

[0007] In order to achieve the above-mentioned objectives, the present invention provides, on the one hand, a method for producing a belt-type reinforced composite plastic pipe, comprising a winding step of winding a reinforcement belt onto a plastic core tube using a winding machine, the winding machine having a plurality of belt reels for simultaneously releasing the reinforcement belts, wherein, in the winding step, a plurality of reinforcement belts released by a plurality of belt reels of the same winding machine are spirally wound on the plastic core tube in an at least partially stacked manner.

[0008] Preferably, the reinforcement tapes released by the respective tape reels of the same winding machine have the same bandwidth d, and in the winding step, the reinforcement tapes released by the respective tape reels of the same winding machine are helically wound on the plastic core tube at the same helix angle α.

[0009] Preferably, in the winding step, the pitch P of the reinforcement tape spirally wound on the plastic core tube satisfies: P≥d / sinα, and the reinforcement tape located in the outer layer released by the adjacent tape reel of the same winding machine is stacked on the two adjacent spirals of the reinforcement tape located in the inner layer at its two side edges.

[0010] Preferably, in the winding step, the pitch P of the reinforcing tape spirally wound on the plastic core tube satisfies: P=(d+△) / sinα, wherein △ is the spacing between adjacent spirals of the reinforcing tape released from the same reel and ranges from 0mm to 5mm.

[0011] Preferably, in the winding step, the stacking width L of the corresponding spirals of the reinforcement tape located in the outer layer released by the adjacent tape reel of the same winding machine and the reinforcement tape located in the inner layer satisfies: L<d / sinα, or, in the winding step, the reinforcement tape located in the outer layer released by the adjacent tape reel of the same winding machine is spirally wound to completely overlap with the reinforcement tape located in the inner layer.

[0012] Preferably, the production method further comprises the step of extruding the plastic core tube before the winding step and the step of compounding a plastic outer tube on the periphery of the reinforcement tape.

[0013] Preferably, a plurality of the winding machines are arranged in the production line for executing the production method, and the winding points of the reinforcement tapes released by the respective tape reels of the same winding machine on the plastic core tube are evenly distributed along the circumference of the plastic core tube, and along the moving direction of the plastic core tube, the reinforcement tapes released by the winding machine arranged downstream are spirally wound on the reinforcement tapes released by the winding machine arranged upstream.

[0014] Preferably, each of the winding machines has an even number of the tape reels.

[0015] Preferably, in the winding step, the rotation directions of the tape reels of the adjacent winding machines are opposite, so that the released reinforcement tape is wound on the plastic core tube in the opposite rotation direction.

[0016] A second aspect of the present invention provides a belt-type reinforced composite plastic pipe produced by the above production method.

[0017] Through the above technical scheme, the production method of the present invention makes the reinforcing tape released from different reels of the same winding machine spirally wound in a way of at least partially overlapping in the winding step of winding the reinforcing tape onto the plastic core tube, so that when the plastic core tube moves straight along its axial direction and passes through a winding machine, multiple reinforcement layers can be formed on the periphery of the plastic core tube, so that the number of winding machines in the production line is less than the number of reinforcement layers required for the belt-type reinforced composite plastic pipe that meets the performance requirements, effectively reducing the number of winding machines required in the production of the belt-type reinforced composite plastic pipe. At the same time, there is no need to reel and unreel the pipe multiple times during the production process, and it is convenient to use a reinforcement tape with a wider bandwidth to form the reinforcement layer, thereby ensuring higher production efficiency and the quality of the obtained pipe. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of a process of spirally winding a reinforcing belt onto a plastic core tube using a production method of the prior art;

[0019] Figure 2 It is a schematic diagram of using the existing production method to spirally wind four reinforcement tapes released from four tape reels of the same winding machine onto a plastic core tube to form a reinforcement layer;

[0020] Figure 3 It is a schematic diagram of a reinforcing belt being spirally wound onto a plastic core tube using the production method of the present invention;

[0021] Figure 4 yes Figure 3 An enlarged view of the local A in FIG.

[0022] Figure 5 It is a schematic diagram of using the production method of the present invention to spirally wind two reinforcement tapes released from two adjacent tape reels of the same winding machine onto a plastic core tube, wherein the two reinforcement tapes are spirally wound to completely overlap;

[0023] Figure 6 It is a schematic diagram of using the production method of the present invention to spirally wind two reinforcement tapes released from two adjacent tape reels of the same winding machine onto a plastic core tube, wherein the outer reinforcement tape and the inner reinforcement tape have a stacking width L;

[0024] Figure 7 It is a schematic diagram of spirally winding four reinforcing tapes released from four tape reels of the same winding machine onto a plastic core tube using the production method of the present invention;

[0025] Figure 8 The present invention is a structural diagram of each layer of a belt-type reinforced composite plastic pipe produced by the production method of the present invention.

[0026] Description of Reference Numerals

[0027] 1-reinforcement tape; 11-first reinforcement tape; 12-second reinforcement tape; 13-third reinforcement tape; 14-fourth reinforcement tape; 2-plastic core tube; 3-plastic outer tube; 4-winding gap; P-pitch; △-spacing between adjacent spirals; d-bandwidth; α-helix angle; L-stacking width; 10-first reinforcement layer; 20-second reinforcement layer. DETAILED DESCRIPTION

[0028] The specific implementation of the present invention is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described here is only used to illustrate and explain the present invention, and is not used to limit the present invention.

[0029] One aspect of the present invention provides a method for producing a belt-type reinforced composite plastic pipe. Figures 3 to 8As shown, the production method includes the steps of using a winding machine (not shown) to wind the reinforcement tape 1 onto the plastic core tube 2 to form multiple reinforcement layers (such as the first reinforcement layer 10 and the second reinforcement layer 20), wherein the winding machine has multiple belt reels for simultaneously releasing the reinforcement tape 1. The reinforcement tape can be a belt-type reinforcement material of various suitable materials, such as polyester fiber tape, glass fiber tape, metal ribbon, metal tape, etc. The winding machine can have a suitable number of belt reels, such as two, three, four, six, eight, etc., that is, the winding machine is a "two-reel belt winding machine", "three-reel belt winding machine", "four-reel belt winding machine", etc. In the following exemplary description, the production method of the present invention will be mainly described by taking the production line using a four-reel belt winding machine as an example. In the order from the inside to the outside, the reinforcement tapes 1 released by each of the belt reels are respectively the first reinforcement tape 11, the second reinforcement tape 12, the third reinforcement tape 13 and the fourth reinforcement tape 14.

[0030] For ease of explanation, Figure 3 The figure shows a situation where only one reinforcement tape 1 (i.e., the first reinforcement tape 11) is spirally wound. Figure 4 As shown in the enlarged view of FIG. 1 , the first reinforcement tape 11 is wound on the outer peripheral wall of the plastic core tube 2 at a pitch P, and there is a winding gap 4 between adjacent spirals. In an alternative embodiment, adjacent spirals of the first reinforcement tape 11 may also be adjacent to each other, that is, the winding gap is 0. By setting a non-zero winding gap 4, it is possible to effectively prevent adjacent spirals of the same reinforcement tape 1 from overlapping each other, thereby ensuring the quality of the manufactured pipe without strictly controlling the manufacturing accuracy and winding precision of the reinforcement tape 1.

[0031] Figure 4 Parameters such as the width d of the wound reinforcement tape 1, the helix angle α of the helical winding, and the spacing △ between adjacent helices are also marked. Figures 5 to 7 In the preferred embodiment described, these parameters of different reinforcement tapes 1 are the same, so that the pipe material has substantially the same strength at each circumferential wall position. When the pitch P of the reinforcement tape 1 wound spirally on the plastic core tube 2 satisfies: P = d / sinα, the adjacent spirals of the reinforcement tape 1 are adjacent to each other, that is, the winding gap is 0; when the pitch P of the reinforcement tape 1 wound spirally on the plastic core tube 2 satisfies: P> d / sinα, the adjacent spirals of the reinforcement tape 1 are spaced apart from each other, that is, there is a non-zero winding gap 4.

[0032] Figure 5 and Figure 6 The two reinforcing tapes 1 released from two adjacent tape reels of the same winding machine are respectively shown to be spirally wound, that is, the first reinforcing tape 11 is spirally wound on the outer peripheral wall of the plastic core tube 2 with a pitch P, and the second reinforcing tape 12 is spirally wound on the outside of the first reinforcing tape 11 with the same pitch P, and the second reinforcing tape 12 is completely or partially stacked on the first reinforcing tape 11. Further, as Figure 7 As shown, four reinforcing tapes 1 released from four reels of the same winding machine can be spirally wound, that is, in Figure 6 On the basis of the structure shown in FIG. 1 , the third reinforcement tape 13 is spirally wound on the outside of the second reinforcement tape 12 with the same pitch P, and the third reinforcement tape 13 is completely or partially stacked ( Figure 7 The fourth reinforcement tape 14 is spirally wound on the outside of the third reinforcement tape 13 with the same pitch P, and the fourth reinforcement tape 14 is completely or partially stacked on the third reinforcement tape 13.

[0033] Therefore, in the production method of the present invention, in the winding step of winding the reinforcement tape 1 onto the plastic core tube 2, the reinforcement tape 1 released from different reels of the same winding machine is spirally wound in an at least partially stacked manner, so that when the plastic core tube 2 moves straight along its axial direction and passes through a winding machine, multiple reinforcement layers can be formed on the periphery of the plastic core tube 2, so that the number of winding machines in the production line is less than the number of reinforcement layers required for the belt-type reinforced composite plastic pipe that meets the performance requirements, effectively reducing the number of winding machines required in the production of the belt-type reinforced composite plastic pipe. At the same time, there is no need to reel and unreel the pipe multiple times during the production process, and it is convenient to use a reinforcement tape 1 with a wider bandwidth to form a reinforcement layer, thereby ensuring higher production efficiency and quality of the pipe obtained.

[0034] It should be understood that, in the winding step, the production method of the present invention is not limited to the situation where the reinforcement tapes 1 released from adjacent reels of the same winding machine are stacked one after another, but can be stacked and wound in other ways. For example, in the winding step using a four-reel winding machine, the third reinforcement tape 13 is stacked and wound around the periphery of the first reinforcement tape 11, and then the second reinforcement tape 12 and the fourth reinforcement tape 14 are stacked and wound around the periphery of the third reinforcement tape 13, which can also efficiently produce qualified pipes.

[0035] As mentioned above, the reinforcing tapes 1 released from the various tape reels of the same winding machine can have the same bandwidth d as each other, and can be spirally wound around the outer circumference of the plastic core tube 2 with the same spiral parameters, so that it is relatively easy to make the manufactured pipe have uniform strength at each circumferential wall position. In other embodiments, different reinforcing tapes 1 can also have different bandwidths, or be wound with different spiral parameters, but this requires complex winding process design and control to meet the pipe strength requirements.

[0036] exist Figure 5In the preferred embodiment shown, the first reinforcement tape 11 and the second reinforcement tape 12 are released from two adjacent tape reels of the same winding machine, wherein the first reinforcement tape 11 is directly engaged with the outer peripheral wall of the plastic core tube 2, and the second reinforcement tape 12 is spirally wound on the outer peripheral surface of the first reinforcement tape 11, that is, the first reinforcement tape 11 is located in the inner layer, and the second reinforcement tape 12 is located in the outer layer and is separated from the plastic core tube 2 by the first reinforcement tape 11. The second reinforcement tape 12 is spirally wound to completely overlap with the first reinforcement tape 11. That is, the stacking width L of the second reinforcement tape 12 and the first reinforcement tape 11 satisfies: L = d / sinα.

[0037] Understandably, Figure 5 For the sake of clarity, only two reinforcement tapes are shown, which can be wound by a four-reel winding machine to have four reinforcement tapes. The winding points of the four reinforcement tapes on the plastic core tube 2 are evenly distributed along the circumference of the plastic core tube 2. Through the above winding steps, the second reinforcement tape 12 completely overlaps with the first reinforcement tape 11 in the thickness direction. In other words, in the winding step, taking the first reinforcement tape 11 as a reference, when the second reinforcement tape 12 is spirally wound onto the first reinforcement tape 11, the first side edge 12a of the second reinforcement tape 12 is aligned with the first side edge 11a of the first reinforcement tape 11, and the second side edge 12b of the second reinforcement tape 12 is aligned with the second side edge 11b of the first reinforcement tape 11, and so on, the corresponding side edges of the third reinforcement tape and the fourth reinforcement tape are also aligned therewith. Thus, when the plastic core tube 2 moves straight along its axial direction and passes through a winding machine, four reinforcement layers can be formed on the outer periphery of the plastic core tube 2, and 20 reinforcement layers can be formed by five four-reel winding machines.

[0038] Figure 5 The winding method shown can effectively prevent a portion of the outer reinforcement band (second reinforcement band 12) from directly pressing on the outer wall of the plastic core tube 2, thereby affecting the quality of the pipe in this area. However, since the four layers of reinforcement bands have the same winding gap 4, the portion between adjacent spirals cannot be reliably reinforced, thus affecting the performance of the pipe.

[0039] exist Figure 6 and Figure 7 In another preferred embodiment shown, the outer reinforcement tape 1 released from adjacent tape reels of the same winding machine is stacked on the two adjacent spirals of the inner reinforcement tape 1 at its two side edges. Figure 3 and Figure 4 As shown, the first reinforcement belt 11 is spirally wound on the outer wall of the plastic core tube 2 at a spiral angle α, and there may be a winding gap 4 between adjacent spirals or they may be adjacent to each other, but the spacing △ between adjacent spirals is less than d / sinα (or 0); the second reinforcement belt 12 is spirally wound on the outer peripheral surface of the first reinforcement belt 11 at the same spiral angle α, as shown in FIG. Figure 6As shown, the two side edges of the second reinforcement tape 12 are respectively stacked on the two adjacent spirals of the first reinforcement tape 11, that is, they are laid on the outer periphery of the first reinforcement tape 11 across the winding gap 4. That is, the stacking width L of the corresponding spirals of the second reinforcement tape 12 and the first reinforcement tape 11 satisfies L<d / sinα. Through this arrangement, the reinforcement tapes 1 released from different reels of the same winding machine are staggered and stacked, which can effectively ensure that the manufactured pipe has uniform strength at each peripheral wall position.

[0040] For example, the stacking width L of the corresponding spirals of the reinforcement tape 1 located in the outer layer and the reinforcement tape 1 located in the inner layer released by adjacent reels of the same winding machine can be (n-1)d / nsinα, where n is the number of reels on the winding machine. That is, the stacking width L of the mutually stacked reinforcement tapes 1 is (n-1) / n of the projection line width of the reinforcement tape 1 on the vertical plane passing through the central axis of the pipe, and the stacking width of the adjacent spirals of the reinforcement tape 1 located in the inner layer is approximately d / nsinα.

[0041] Understandably, Figure 6 For the sake of clarity, only two reinforcement tapes are shown, which can be wound by a four-reel winding machine to have four reinforcement tapes, such as Figure 7 As shown. The winding points of the four reinforcement tapes on the plastic core tube 2 are evenly distributed along the circumference of the plastic core tube 2. Through the above-mentioned winding steps, the second reinforcement tape 12 partially overlaps with the corresponding spiral of the first reinforcement tape 11 in the thickness direction. In other words, in the winding step, taking the first reinforcement tape 11 as a reference, when the second reinforcement tape 12 is spirally wound onto the first reinforcement tape 11, the first side edge 12a of the second reinforcement tape 12 is offset by a predetermined distance relative to the first side edge 11a of the corresponding spiral of the first reinforcement tape 11 along the advancing direction of the pipe, and the second side edge 12b of the second reinforcement tape 12 is also offset by a predetermined distance relative to the second side edge 11b of the corresponding spiral of the first reinforcement tape 11 along the advancing direction of the pipe, and so on, the corresponding side edges of the third reinforcement tape and the fourth reinforcement tape are also offset accordingly.

[0042] In the case where there is a winding gap 4 between adjacent spirals of the same reinforcement tape, the pitch P of the spiral winding of the reinforcement tape satisfies P=(d+△) / sinα, where △ is the spacing between adjacent spirals of the reinforcement tape 1 released from the same reel. In a preferred embodiment of the present invention, △ ranges from 0 mm to 5 mm, such as 2 mm.

[0043] A plurality of winding machines may be arranged in the production line of the belt-type reinforced composite plastic pipe. Along the moving direction of the plastic core pipe 2, the reinforcement belt 1 released by the winding machine arranged downstream is spirally wound on the reinforcement belt 1 released by the winding machine arranged upstream to form a multi-layer reinforcement layer, for example Figure 8As shown, the first reinforcement layer 10 and the second reinforcement layer 20 are shown. As mentioned above, the points where the reinforcement tapes 1 released by the tape reels of each winding machine are wound on the plastic core tube 2 are evenly distributed along the circumference of the plastic core tube 2, thereby making the circumferential force of the tube symmetrical and ensuring that the plastic core tube 2 is not pulled off during the production process. In addition, the rotation directions of the tape reels of adjacent winding machines are opposite, so that the released reinforcement tapes 1 are wound on the plastic core tube 2 in opposite directions, for example Figure 8 As shown, the first reinforcement belt 11, the second reinforcement belt 12, the third reinforcement belt 13 and the fourth reinforcement belt 14 released by the first winding machine arranged along the forward direction of the pipe are spirally wound on the outer peripheral surface of the plastic core tube 2 to form a first reinforcement layer 10; the second winding machine arranged after the first winding machine rotates in the opposite direction, and the reinforcement belts released by it are spirally wound on the periphery of the first reinforcement layer 10 to form a second reinforcement layer 20, thereby preventing the plastic core tube 2 from rotating during the production process.

[0044] In addition, the production method of the present invention may further include the step of extruding the plastic core tube 2 before the winding step and the step of compounding the plastic outer tube 3 on the outer periphery of the reinforcement tape 1 .

[0045] Based on the above production method, the present invention also provides a belt-type reinforced composite plastic pipe produced by the production method.

[0046] The preferred embodiments of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited thereto. Within the technical concept of the present invention, the technical solution of the present invention can be subjected to a variety of simple modifications, including the combination of various specific technical features in any suitable manner. In order to avoid unnecessary repetition, the present invention will not further describe various possible combinations. However, these simple modifications and combinations should also be regarded as the contents disclosed by the present invention and belong to the protection scope of the present invention.

Claims

1. A method for producing a belt-type reinforced composite plastic pipe, characterized in that: The invention comprises a winding step of winding a reinforcement tape (1) onto a plastic core tube (2) by means of a winding machine, wherein the winding machine has a plurality of reels for simultaneously releasing the reinforcement tape (1), wherein: In the winding step, a plurality of the reinforcing tapes (1) released from a plurality of the tape reels of the same winding machine are spirally wound on the plastic core tube (2) in an at least partially stacked manner.

2. The method for producing a belt-type reinforced composite plastic pipe according to claim 1, characterized in that: The reinforcing tapes (1) released from the respective tape reels of the same winding machine have the same bandwidth d. In the winding step, the reinforcing tapes (1) released from the respective tape reels of the same winding machine are helically wound on the plastic core tube (2) at the same helix angle α.

3. The method for producing a belt-type reinforced composite plastic pipe according to claim 2, characterized in that: In the winding step, the pitch P of the reinforcing tape (1) wound spirally on the plastic core tube (2) satisfies: P≥d / sinα, and the reinforcing tape (1) located in the outer layer released from the adjacent tape reels of the same winding machine is stacked on the two adjacent spirals of the reinforcing tape (1) located in the inner layer at its two side edges.

4. The method for producing a belt-type reinforced composite plastic pipe according to claim 3, characterized in that: In the winding step, the pitch P of the reinforcing tape (1) wound spirally on the plastic core tube (2) satisfies: P = (d + △) / sinα, where △ is the spacing between adjacent spirals of the reinforcing tape (1) released from the same reel and ranges from 0mm to 5mm.

5. The method for producing a belt-type reinforced composite plastic pipe according to claim 2, characterized in that: In the winding step, the stacking width L of the corresponding spirals of the reinforcement tape (1) located in the outer layer released by the adjacent tape reel of the same winding machine and the reinforcement tape (1) located in the inner layer satisfies: L<d / sinα, or, in the winding step, the reinforcement tape (1) located in the outer layer released by the adjacent tape reel of the same winding machine is spirally wound to completely overlap with the reinforcement tape (1) located in the inner layer.

6. The method for producing a belt-type reinforced composite plastic pipe according to claim 1, characterized in that: The production method further comprises the step of extruding the plastic core tube (2) before the winding step and the step of compounding a plastic outer tube (3) on the outer periphery of the reinforcement band (1).

7. The method for producing a belt-type reinforced composite plastic pipe according to claim 1, characterized in that: A plurality of winding machines are arranged in the production line for executing the production method, and the winding points of the reinforcing tape (1) released by each of the tape reels of the same winding machine on the plastic core tube (2) are evenly distributed along the circumference of the plastic core tube (2), and along the moving direction of the plastic core tube (2), the reinforcing tape (1) released by the winding machine arranged downstream is spirally wound on the reinforcing tape (1) released by the winding machine arranged upstream.

8. The method for producing a belt-type reinforced composite plastic pipe according to claim 7, characterized in that: Each of the winding machines has an even number of the tape reels.

9. The method for producing a belt-type reinforced composite plastic pipe according to claim 7, characterized in that: In the winding step, the rotation directions of the reels of the adjacent winding machines are opposite, so that the released reinforcement tape (1) is wound on the plastic core tube (2) in the opposite rotation direction.

10. A belt-reinforced composite plastic pipe produced by the production method according to any one of claims 1 to 9.

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