WO2018025454A1

WO2018025454A1 - Method for continuously producing resin-metal composite pipe, and resin-metal composite pipe resulting from said production method

Info

Publication number: WO2018025454A1
Application number: PCT/JP2017/015400
Authority: WO
Inventors: 浩司波谷; 史和松下; 智裕小川; 泰坂根; 智士丸山; 山本　耕平
Original assignee: 東拓工業株式会社
Priority date: 2016-08-05
Filing date: 2017-04-14
Publication date: 2018-02-08
Also published as: JP6084743B1; JP2018020515A

Abstract

Provided are a method for continuously producing a resin-metal composite pipe, and a resin-metal composite pipe resulting from said production method. This method is provided with a step for forming a coiled strip-shaped reinforcing plate 2 having a prescribed cross-sectional shape by rolling a metal strip, a step for forming a base resin 31a and a binder resin 4 into a resin strip B1 having a two-layered structure by using a joining die 13, a step for winding the semi-molten resin strip B1 in a spiral on the inner peripheral side of the coiled strip-shaped reinforcing plate 2 and forming a lower resin layer 31, and a step for tightly fixing the binder resin 4 and the coiled strip-shaped reinforcing plate 2.

Description

Resin-metal composite tube continuous production method and resin-metal composite tube obtained by the production method

The present invention relates to a continuous production method of a resin / metal composite pipe mainly used for a culvert drain pipe, a cable protection pipe, and an existing pipeline rehabilitation pipe, and a resin / metal composite pipe obtained by the production method.

A resin-metal composite tube in which a steel plate is embedded in resin is disclosed in Patent Document 1, for example. The resin-metal composite tube having the above configuration is formed by spirally winding a resin strip around the molding machine to form an inner layer (lower resin layer), and spirally winding a strip steel plate around the inner layer, Next, the outer periphery (upper resin layer) is formed by spirally winding a resin strip around the outer periphery of the strip steel plate.

By the way, the steel sheet and the resin may have poor adhesion. Therefore, in Patent Document 1, the surface of the strip steel plate is previously coated with an adhesive resin (binder), and when the strip steel plate is wound around the inner layer, the binder steel is heated and melted to melt the strip steel plate and the inner and outer layers. The adhesion is improved.

Japanese Patent Application Laid-Open No. 6-126827

However, if the surface of the strip steel plate is coated with a binder, the strip steel plate cannot be welded and added. Therefore, continuous molding cannot be performed, and the product length is limited to a certain dimension. Although it may be added in advance before the resin coating, it is still limited to a certain size, and if the strip-like steel plate remains in a half-length, it cannot be used elsewhere, resulting in a loss.
Moreover, in order to coat | cover a strip steel plate with a binder, a dedicated line is required, and also the storage place and equipment of the strip | belt steel plate after coating | cover are also required, and it causes an increase in manufacturing cost. In fact, at the applicant's manufacturing base, the strip coating process of the strip steel plate and the pipe making process using the strip coated steel strip are separate processes, but there are still problems in the efficient operation of the factory site. In addition, there is a problem that pipe manufacturing costs such as quality check at the time of production, and waste is generated at the start and end of manufacturing in each process, which causes an increase in pipe manufacturing cost.

Therefore, an object of the present invention is to provide a continuous production method of a resin / metal composite tube and a resin / metal composite tube obtained by the production method.

In the continuous manufacturing method of the resin-metal composite pipe of the present invention, the step of forming a coil-like strip reinforcing plate 2 having a predetermined cross-sectional shape by rolling a metal strip, and the base resin 31a and the binder resin 4 by the joining die 13 A step of forming the two-layered resin strip B1, a step of spirally winding the semi-molten resin strip B1 around the inner peripheral side of the coiled strip reinforcing plate 2, and forming the lower resin layer 31; a binder; And a step of closely fixing the resin 4 and the coiled belt-like reinforcing plate 2.

It is preferable that the joining die 13 is provided immediately above the winding part.

It is preferable to include a step of forming the upper resin layer 32 on the coiled belt-like reinforcing plate 2. In this case, it is preferable that the upper resin layer 32 has a two-layer structure including the base resin 32a and the binder resin 4 and includes a step of closely fixing the binder resin 4 and the coiled belt-like reinforcing plate 2.

In addition, it is preferable that the entire circumference in the longitudinal direction of the coiled strip-shaped reinforcing plate 2 is covered with the upper resin layer 32 and the lower resin layer 31.

Alternatively, it is preferable that the entire circumference in the longitudinal direction of the coiled strip-shaped reinforcing plate 2 is covered with the binder resin 4 of the upper resin layer 32 and the lower resin layer 31.

The

base resin

32a, 31a of the upper resin layer 32 or / and the lower resin layer 31 is made of an olefin resin, and the binder resin 4 of the lower resin layer 31 or / and the upper resin layer 32 is modified with a polar group. It is preferable that the resin is composed of an olefin resin containing a resin derivative.

Using a galvanized steel sheet as a metal strip, rolling the steel sheet to form a coiled strip reinforcing plate 2, the thickness of the rolled portion is 88% or more and less than 100% of the original steel sheet thickness. It is preferable that

It is preferable to make the inner and outer peripheral surfaces of the pipe smooth.

It is preferable that the inner peripheral surface or / and the outer peripheral surface of the pipe have a spiral wave shape.

It is preferable to form voids P in the lower resin layer 31.

It is preferable to form the air gap P by providing a compressed air line in the joining die 13 and feeding the compressed air into the base resin 31a.

The resin-metal composite tube of the present invention is manufactured by the above continuous manufacturing method.

It is preferable that the use is a culvert drain pipe.

The use is preferably a cable protection tube.

It is preferable that the use is an existing pipe rehabilitation pipe.

In the continuous manufacturing method of the resin-metal composite pipe of the present invention, the step of forming a coil-like strip-shaped reinforcing plate having a predetermined cross-sectional shape by rolling a metal strip, and the base resin and the binder resin have a two-layer structure using a joining die A step of forming a resin strip, a step of forming a lower resin layer by spirally winding a semi-molten resin strip on the inner peripheral side of the coiled strip reinforcing plate, a binder resin and a coiled strip reinforcing plate, It is not necessary to previously coat the surface of the belt-shaped reinforcing plate with a binder. Therefore, the metal strips can be joined together by welding, and continuous molding of the resin-metal composite tube is possible. In addition, a dedicated line for coating the metal strip with a binder is no longer necessary, and no storage place or equipment for the metal strip after coating is required, so that the manufacturing cost can be reduced. An efficient production line arrangement is also possible.

If the junction die is provided immediately above the winding portion, the shape of the resin band can be easily maintained, and the collapse of the two-layer structure can be suppressed.
In addition, when the resin strip is molded at a position away from the winding part, the binder resin covers the outer periphery of the base resin in the course of conveyance due to the difference in viscosity between the base resin and the binder resin, and the desired two-layer It becomes difficult to obtain the structure.

If the step of forming the upper resin layer on the coiled belt-like reinforcing plate is provided, the upper resin layer prevents the steel plate from being lifted while securing the fixing to the steel plate with the binder resin of the lower resin layer. A resin-metal composite tube capable of maintaining a laminated state can be manufactured.

If the upper resin layer has a two-layer structure consisting of a base resin and a binder resin, and the binder resin and the coiled belt-like reinforcing plate are closely fixed, the upper resin layer and the lower resin layer are both firmly fixed to the steel plate. A resin-metal composite tube that can be secured and can maintain a further laminated state can be manufactured.

If the entire length of the longitudinal cross section of the coiled strip reinforcing plate is covered with the upper resin layer and the lower resin layer, the entire steel material is covered with the resin, and the resin-metal composite enables long-term rust prevention of the steel plate. Can manufacture tubes.

If the entire circumference in the longitudinal direction of the coiled strip reinforcing plate is covered with the binder resin of the upper resin layer and lower resin layer, the entire steel plate is covered with the binder resin, enabling long-term rust prevention of the steel plate. Thus, a resin-metal composite tube having the strongest laminated structure of tubes can be manufactured.

An olefin resin containing an olefin resin derivative in which the base resin of the upper resin layer or / and the lower resin layer is composed of an olefin resin, and the binder resin of the lower resin layer or / and the upper resin layer is modified with a polar group If it consists of resin, the resin metal composite pipe | tube which uses olefin resin, such as polyethylene with a low roughness coefficient and excellent weather resistance, can be manufactured.

Using a galvanized steel sheet as a metal strip, rolling the steel sheet to form a coiled strip reinforcing plate, and the thickness of the rolled part is 88% or more and less than 100% of the thickness of the original steel sheet Then, the coiled belt-like reinforcing plate can be formed while maintaining the laminated structure of the galvanized steel sheet itself. In addition, the effect of metal species on resin degradation is much greater than that of zinc. Therefore, the zinc layer of the galvanized steel sheet can be prevented from peeling off, and the iron layer can be prevented from coming into direct contact with the resin. Resin-metal composite tubes that can maintain the properties for a longer period can be manufactured.

If the inner and outer peripheral surfaces of the pipe are smooth, it is suitable for applications that allow fluid to flow inside and for insertion into existing pipes. In addition, if the inner peripheral surface and / or outer peripheral surface of the tube is a spiral wave shape, the tube can be made highly flexible.

It is assumed that if the void is formed in the lower resin layer, the weight of the tube can be reduced.

It is considered possible to efficiently form voids by providing compressed air lines in the confluence die and feeding compressed air into the base resin to form voids.

It is a fragmentary sectional view showing the resin metal composite pipe concerning one embodiment of this invention. (A) is the schematic which shows the manufacturing apparatus of a resin metal composite pipe | tube, (b) is the end elevation which showed the inner side of the molding machine. It is sectional drawing which showed the manufacturing process of the resin metal composite pipe. It is sectional drawing which showed the other resin metal composite pipe | tube. It is sectional drawing which showed other resin metal composite pipe | tube.

Next, embodiments of the present invention will be described in detail with reference to the drawings. As shown in FIG. 1, a resin-metal composite tube 1 according to an embodiment of the present invention embeds a coiled strip-shaped reinforcing plate 2 formed by forming a metal strip into a predetermined cross-sectional shape in the tube wall of the resin tube. In other words, it is formed by covering the coiled belt-like reinforcing plate 2 with the resin 3. Applications are various such as for underdrain drainage pipes, cable protection pipes, and existing pipe rehabilitation pipes. Therefore, in FIG. 1, the inner and outer peripheral surfaces are formed as a substantially smooth tube, but either or both of the inner peripheral surface and the outer peripheral surface may be formed in a spiral wave shape according to the application.

As shown in FIG. 1, the coiled strip-shaped reinforcing plate 2 is formed by rolling and forming a metal strip into a coil shape in the longitudinal direction while forming a substantially cross-section with a flat upper end surface. And it has the convex part 2a which continues in a longitudinal direction, and the recessed part 2b formed in the back surface in connection with formation of the convex part 2a. Specifically, it has a top surface 2c,

leg portions

2d and 2d extending downward from both ends of the top surface 2c, and a base portion 2e extending outward from the lower end of the leg portion 2d.

The coiled strip-shaped reinforcing plate 2 is spirally wound in the tube wall, and is embedded at substantially equal intervals with a gap (interval) S in the tube axis direction without contacting each other. The material is galvanized steel that is not coated with resin (not coated with a binder), but various metals such as steel, stainless steel, and aluminum can also be used.

Resin 3 is continuous over the entire length from one end to the other end of the tube, and it can be said that only resin 3 forms a tube shape. The resin 3 is also filled in the recess 2 b of the coiled belt-like reinforcing plate 2. There are almost no voids in the cross section (no intentional voids are formed). The resin 3 is roughly divided into a resin (lower resin layer) 31 on the inner peripheral side of the tube and a resin (upper resin layer) 32 on the outer peripheral side of the tube. The lower resin layer 31 and the outer resin layer 32 have a two-layer structure of base resins 31 a and 32 a and a binder resin 4. The

base resin

32a, 31a of the upper resin layer 32 and / or the lower resin layer 31 is an olefin resin. The binder resin 4 of the lower resin layer 31 and / or the upper resin layer 32 is preferably an olefin resin containing an olefin resin derivative modified with a polar group.

Between the base resin 31a and the coiled strip reinforcing plate 2, between the base resin 32a and the coiled strip reinforcing plate 2, and between the base resin 31a and the base resin 32a in the range of the gap S, the binder resin 4 is provided. The

base resin

31a, 32a and the coiled belt-like reinforcing plate 2 are not in direct contact with each other. In this state, it can be said that the coiled belt-shaped reinforcing plate 2 is covered with the binder resin 4 and the base resin 31a and the base resin 32a are separated vertically (inside and outside) by the binder resin 4.

The resin-metal composite tube 1 having the above structure is manufactured as follows. First, as shown in FIG. 2 a, a metal strip having a flat cross-sectional shape drawn from the coil R is passed through a rolling mill 10. The rolling mill 10 has a pair of upper and lower rolling rolls. The metal strip passing through is finally formed (roll-rolled) into a spiral coil shape having a substantially cross-sectional shape having a convex portion 2a on the outer diameter side and a concave portion 2b on the inner diameter side. Rolling is performed so that the thickness of the rolled portion is 88% or more and less than 100% of the thickness of the non-rolled portion. By rolling in this way, peeling of the galvanized layer from the steel can be suppressed, and adhesion to the resin 3 performed later can be performed stably.

Note that the metal strip of the coil R is gradually pulled out by the rolling mill 10 and eventually disappears. In that case, a new coil R is prepared, and the tip of the new metal strip is added to the rear end of the original metal strip. In order to add the metal strips, the ends of the metal strips are welded together (butt welding) with a welding machine 11 provided on the front side of the rolling mill 10. Although welding is usually performed while the line is operating, the line may be temporarily stopped.

Next, the metal strip (that is, the coiled strip reinforcing plate 2) formed from the rolling mill 10 and formed into a coil having a predetermined cross-sectional shape is transferred to the molding section 12a of the molding machine 12. Specifically, the coil-shaped belt-like reinforcing plate 2 is suspended from a rod-shaped guide roll E provided from the rolling mill 10 to the molding portion 12a of the molding machine 12, and the rear side of the molding machine 12 (power to be described later) From the portion 12c side) to the forming portion 12a. The forming portion 12a is configured by arranging a plurality of elongated rod-shaped forming rolls 12b having a circular cross section in the circumferential direction at a predetermined interval, and is substantially cylindrical as a whole. The coil-shaped belt-shaped reinforcing plate 2 is wound around the outer periphery of the substantially cylindrical forming portion 12a. Each forming roll 12b of the forming portion 12a is supported so as to be rotatable around its axis, and is rotated at the same speed in the same direction (clockwise) by the power from the power portion 12c. Therefore, the coil-shaped belt-shaped reinforcing plate 2 spirally wound around the forming portion 12a sequentially advances toward the front (opposite side of the power portion 12c). In addition, in order to make the helical pitch and outer diameter of the coiled belt-like reinforcing plate 2 uniform, and to ensure the adhesion between the lower resin layer 31 and the coiled belt-like reinforcing plate 2, an upper roller is provided on the outer peripheral side of the molded part 12a. 15. A lower roller 19 is provided. In order to prevent contact between the coiled belt-like reinforcing

plates

2 and 2, a contact-preventing bar (not shown) may be provided between the coiled belt-like reinforcing

plates

2 and 2. Moreover, in order to improve the adhesiveness with the lower resin layer 31 and the upper resin layer 32, the coiled belt-like reinforcing plate 2 may be preheated by a heater (not shown) provided on the outer peripheral side of the molded part 12a. .

Incidentally, as shown in FIG. 2b, a central axis C having a hollow portion is provided on the inner peripheral side of the molding portion 12a, and the molding roll 12b is arranged around the central axis C coaxially or at a predetermined angle. Has been. A first junction die 13 is provided in the hollow portion of the central axis C. The first joining die 13 communicates with a first base resin extruder 14A and a first binder resin extruder 14B provided at the rear of the molding machine 12, and is sent from the first base resin extruder 14A. The semi-molten base resin 31a and the semi-molten binder resin 4 sent from the first binder resin extruder 14B are co-extruded to form the first resin band B1. The first joining die 13 is provided immediately above the winding portion of the first resin strip B1 around the molding portion 12a, and the co-extrusion immediately before the transition from the central axis C to the molding roll 12b on the molding portion 12a. Is done.

The first resin strip B1 coextruded from the first joining die 13 has a two-layer structure of a base resin 31a and a binder resin 4 as shown in FIG. 3a. Moreover, it has the embedding part 31b substantially the same shape as the recessed part 2b of the coil-shaped strip | belt-shaped reinforcement board 2, and the

flat parts

31c and 31c which spread right and left from the lower end.

The first resin strip B1 having the above-described configuration is extended to the outside of the molding portion 12a through the gap between the molding rolls 12b and 12b, and is the outer periphery (on the molding portion 12a) of the molding portion 12a. It winds around the part (winding part) located just under 13 spirally. At this time, since the coiled belt-shaped reinforcing plate 2 is already positioned on the outer periphery of the molded part 12a with a gap between the molded part 12a, the first resin belt-shaped body B1 is connected to the molded part 12a. It winds around the outer periphery of the molding part 12a so as to be slid into the gap between the coiled belt-shaped reinforcing plates 2 (the inner peripheral side of the coiled belt-shaped reinforcing plate 2). In addition, the base resin 31a is wound toward the molding portion 12a side and the binder resin 4 is wound toward the outer peripheral side so that the binder resin 4 is positioned on the coiled belt-like reinforcing plate 2 side. In this state, it can also be said that the outer peripheral surface of the base resin 31a wound around the molding portion 12a is covered with the binder resin 4. Moreover, it spirally winds so that the rear end of the preceding first resin strip B1 and the tip of the subsequent first resin strip B1 may overlap.

After that, the pitch of the coiled strip reinforcing plate 2 already positioned on the first resin strip B1 is adjusted by the upper roller 15 and is fixed to the first resin strip B1. The lower roller 19 ensures the adhesion between the first resin strip B1 and the coiled strip reinforcing plate 2 immediately after being extruded. Thus, by cooperation of both

rollers

15 and 19, the end portions of the first resin strips B1 and B1 are firmly fused to form the lower resin layer 31 having no gap in the tube axis direction. Further, the base resin 31a and the coiled belt-like reinforcing plate 2 are bonded (fixed and fixed) via the binder resin 4. At this time, as shown in FIG. 3 b, the embedded portion 31 b of the first resin strip B 1 fills the recess 2 b of the coil-shaped strip reinforcing plate 2. Note that the upper roller 15 and the lower roller 19 are not limited to the present embodiment, and the roller shape can be changed as appropriate according to the pipe structure to be manufactured, and the number of rollers installed can be changed.

After the first resin strip B1 and the coiled strip reinforcing plate 2 are overlaid and integrally molded, the upper resin layer 32 is then formed. As shown in FIG. 2b, a second joining die 16 is provided on the outer peripheral side of the forming portion 12a. The second joining die 16 communicates with the second base resin extruder 17A and the second binder resin extruder 17B, respectively, and a semi-molten base resin 32a sent from the second base resin extruder 17A. The semi-molten binder resin 4 sent from the second binder resin extruder 17B is coextruded.

The second resin strip B2 coextruded from the second joining die 16 has a two-layer structure of the base resin 32a and the binder resin 4 as shown in FIG. 3c. Moreover, it has the embedding part 32b for filling the ditch | groove 5 formed between the convex parts 2a and 2a of the strip | belt-shaped reinforcement board 2, and the flat part 32c extended from the upper end to right and left.

The second resin strip B2 having the above configuration is spirally wound around the outer periphery of the coiled strip reinforcing plate 2 (on the coiled strip reinforcing plate 2) so as to cover the coiled strip reinforcing plate 2. At this time, the binder resin 4 is wound on the inner peripheral side and the base resin 32a is wound on the outer peripheral side so that the binder resin 4 is positioned on the belt-like reinforcing plate 2 side. Moreover, it spirally winds so that the rear end of the preceding second resin strip B2 and the tip of the subsequent second resin strip B2 overlap.

Thereafter, the second resin strip B2 is pressed against the coiled strip reinforcing plate 2 side by the pressing roller 18 of FIG. 2a. As a result, the end portions of the second resin strips B2 and B2 adjacent on the coiled strip reinforcing plate 2 are firmly fused to form the upper resin layer 32 having no gap in the tube axis direction. In addition, the base resin 32a and the coiled belt-like reinforcing plate 2 are bonded (tightly fixed) via the binder resin 4, and the embedded portion 32b of the second resin belt-like body B2 is provided between the coiled belt-like reinforcing

plates

2 and 2 The groove 5 is filled. Further, the entire circumference in the longitudinal direction of the coiled belt-shaped reinforcing plate 2 is covered with the binder resin 4 of the upper resin layer 32 and the lower resin layer 31. This completes the production of the resin-metal composite tube 1.

According to the above manufacturing method, since the first and second resin strips B1 and B2 have the binder resin 4, it is not necessary to previously coat the coil-shaped strip reinforcing plate 2 with the binder resin 4. For this reason, a coating process step that has been conventionally required is unnecessary, and a significant cost reduction can be achieved.

FIG. 4 shows another resin-metal composite tube 1A. In this resin-metal composite tube 1A, the binder resin 4 does not cover the entire surface of the coiled belt-like reinforcing plate 2, and part of the upper and lower surfaces of the coiled belt-like reinforcing plate 2, specifically, the coiled belt-like reinforcing plate 2 is characterized in that the binder resin 4 is provided only in the vicinity of the central portion in the tube axis direction.

Conventionally, since the surface of the coiled belt-shaped reinforcing plate 2 was covered with the binder resin 4, the binder resin 4 could not be selectively provided in this way. However, according to this manufacturing method, the binder resin 4 is partially applied. It is also possible to provide it at a reduced cost.

FIG. 5 shows still another resin-metal composite tube 1B. The resin-metal composite tube 1B is characterized in that a gap P is provided in the base resin 31a of the lower resin layer 31. The gap P is continuously provided along the spiral direction of the coiled belt-like reinforcing plate 2.

Such a gap P is formed by connecting a compressed air line to the first joining die and feeding compressed air into the base resin 31a.

The representative embodiments of the present invention have been described above. However, the present invention is not limited to the above-described embodiments, and various modifications can be made within the scope of the present invention.

For example, in the above-described embodiment, the second resin strip B2 is coextruded, but the base resin 32a and the binder resin 4 are separately extruded and formed on the molded portion 12a (or the coiled strip reinforcing plate 2). The second resin band B2 may be formed by superimposing the two. The binder resin 4 may be applied by spraying or brushing in addition to extrusion.

The shape of the coiled belt-like reinforcing plate 2 may be a shape in which the top surface 2c and the leg 2d, and the leg 2d and the base 2e are connected by a gentle curve, and further, a steep shape in which corners are formed. It may be a shape that is connected by a simple curve. The shape formed by the top surface 2c and the leg 2d may be an arc shape, a waveform, or a substantially triangular shape. Further, the base 2e is not provided, and an arc shape, a substantially triangular shape, or a substantially trapezoidal shape may be used. Moreover, it may be flat without having the convex part 2a. Furthermore, it may be substantially W-shaped.

Further, the resin strips B1 and B2 are integrally provided with the embedded

portions

31b and 32b and the

flat portions

31c and 32c. However, the resin strips B1 and B2 may be integrally extruded and overlapped to obtain a predetermined shape. good. Different types of resins may be used for the base resin 31a of the lower resin layer 31 and the base resin 32a of the upper resin layer 32.

1, 1A, 1B ··· Resin metal composite tube 2 ·· Coiled strip-shaped reinforcing plate 2a ·· Convex portion 2b ·· Concavity 2c ·· Top surface 2d ·· Leg 2e ··············· Side resin layer B1 .. First resin strip 31a .. Base resin 31b of lower resin layer .. Embedded portion 31c.. Flat portion 32 .. Upper resin layer B2 .. Second resin strip 32a. Base resin 32b of layer ·· Embedded portion 32c · · Flat portion 4 · · Binder resin 5 · · Groove 10 · · Rolling machine 11 · Welding machine 12 · · Molding machine 12a · · Molding portion 12b · · Forming roll 12c · · Power unit 13 · · First joining die 14A · · First base resin extruder 14B · · First binder resin extruder 15 · · Upper roller 16 · · Second joining die 17A · · Second base resin extruder 17B ·· Second binder resin extruder 18 ·· Pressing roller 9 ... lower roller C ... central axis E ... guide roll P .. gap S · coiled strip reinforcing plates of the gap R ... coil

Claims

A step of forming the coil-like band-shaped reinforcing plate (2) having a predetermined cross-sectional shape by rolling the metal band-like body;
Forming a base resin (31a) and a binder resin (4) into a two-layered resin band (B1) by means of a converging die (13);
A step of forming a lower resin layer (31) by spirally winding the semi-molten resin strip (B1) around the inner peripheral side of the coil-shaped strip reinforcing plate (2);
A step of closely fixing the binder resin (4) and the coiled strip reinforcing plate (2);
A continuous method for producing a resin-metal composite tube, comprising:
The continuous production method for a resin-metal composite pipe according to claim 1, wherein the converging die (13) is provided immediately above the winding portion.
The method for continuously forming a resin-metal composite tube according to claim 1 or 2, comprising a step of forming an upper resin layer (32) on the coiled belt-like reinforcing plate (2).
4. The upper resin layer (32) according to claim 3, wherein the upper resin layer (32) has a two-layer structure composed of a base resin (32a) and a binder resin (4), and the binder resin (4) and the coiled belt-like reinforcing plate (2) are closely fixed. A method for continuously producing a resin-metal composite pipe, comprising a step.
5. The method for continuously producing a resin-metal composite tube according to claim 3, wherein the entire circumference in the longitudinal direction of the coiled belt-like reinforcing plate (2) is covered with the upper resin layer (32) and the lower resin layer (31).
5. A continuous resin-metal composite tube according to claim 4, wherein the entire circumference of the longitudinal cross section of the coiled strip reinforcing plate (2) is covered with the binder resin (4) of the upper resin layer (32) and the lower resin layer (31). Production method.
The base resin (32a, 31a) of the upper resin layer (32) and / or the lower resin layer (31) is made of an olefin resin, and the lower resin layer (31) or / And the continuous manufacturing method of the resin metal composite pipe | tube comprised with the olefin resin containing the olefin resin derivative which modified | denatured the binder resin (4) of the upper side resin layer (32) by the polar group.
In any one of Claim 1 to 6, while using a galvanized steel plate as a metal strip and rolling this steel plate to form a coiled strip reinforcing plate (2), the thickness of the rolled portion is: A method for continuously producing a resin-metal composite tube having a thickness of 88% or more and less than 100% of the thickness of the original steel plate.
9. The method for continuously producing a resin-metal composite tube according to claim 1, wherein the inner and outer peripheral surfaces of the tube are made smooth.
9. The method for continuously producing a resin-metal composite tube according to claim 1, wherein the inner peripheral surface and / or the outer peripheral surface of the tube is formed into a spiral wave shape.
The method for continuously producing a resin-metal composite pipe according to any one of claims 1 to 10, wherein a void (P) is formed in the lower resin layer (31).
12. The method for continuously producing a resin-metal composite tube according to claim 11, wherein the converging die (13) is provided with a compressed air line and the compressed air is fed into the base resin (31a) to form the void (P).
Resin metal composite pipe manufactured by the continuous manufacturing method according to any one of claims 1 to 12.
The resin-metal composite pipe according to claim 13, wherein the use is a culvert drain pipe.
The resin-metal composite tube according to claim 13, wherein the use is a cable protection tube.
The resin-metal composite pipe according to claim 13, wherein the use is an existing pipe rehabilitation pipe.