JP2004278714A - Fluid passage pipe and its manufacturing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To easily line the inner surface and outer surface of a pipe body. <P>SOLUTION: In a fluid passage pipe 1, the end is provided with a flange 6 and the shape varies in the midway of the pipe body 2. The outer surface 2a of the pipe body 2 is lined with a relatively thin polyamide resin 7, and the inner surface 2b of the pipe body 2 is lined with a relatively thick vinyl chloride resin 8. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention is to prevent corrosion of both the inner peripheral surface and the outer peripheral surface of a pipe body of a fluid passage pipe used as a water pipe or a sewer pipe even if the pipe is not a straight pipe. And a method of manufacturing the same.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, when an iron pipe which is a straight pipe (a pipe extending straight) is used as a raw pipe for manufacturing a fluid passage pipe, an inner peripheral surface and an outer peripheral surface of the pipe are used to prevent corrosion of the pipe. A technique for lining a hard vinyl chloride resin on both sides is known.
[0003]
Furthermore, conventionally, when the tube is not a straight tube, that is, for example, a tube that is bent in the middle (a so-called elbow tube) or a tube in which another tube is joined in the middle (a so-called cheese) In the case of a tubular body), a tubular body with a variable thickness (so-called one-sided tubular body), or a tubular body with a branched tip (so-called branched tubular body) In addition to the technique of lining hard vinyl chloride on the inner peripheral surface of the pipe, the technique of applying paint using rust preventive paint on the outer peripheral face of the pipe and the technique of galvanizing for rust prevention are known. ing.
Furthermore, a technique of providing a nylon (registered trademark) layer on the inner peripheral surface of a steel pipe used for a water supply pipe or the like is conventionally known (for example, see Patent Document 1).
[0004]
[Patent Document 1]
JP-A-8-294996 (pages 1-3, FIG. 1)
[0005]
[Problems to be solved by the invention]
However, simply applying paint using rust-preventive paint to the outer peripheral surface of the pipe, or plating it for rust prevention, the fluid passage pipe is usually used for piping under the pool, etc. And the effect of preventing corrosion of the tube was insufficient. Therefore, it is sufficient that hard vinyl chloride resin can be lined on both the inner peripheral surface and the outer peripheral surface of the pipe. However, in practice, when the pipe is not a straight pipe, the hard vinyl chloride is applied to the inner peripheral face of the pipe. However, since the outer peripheral surface of the tube has a complicated shape, it was difficult to line hard vinyl chloride.
[0006]
When the pipe is not a straight pipe, the pipe is coated on polyethylene resin powder or polyamide {nylon (registered trademark)} resin powder, and polyethylene resin is applied to both the inner and outer peripheral surfaces of the pipe. There is known a technology of lining powder of polyamide resin or lining powder of polyamide resin. In these techniques, corrosion of the outer peripheral surface of the tubular body can be prevented by lining a powder of a polyethylene resin or a lining of a powder of a polyamide resin. However, in general, the thickness of the lining of the polyethylene resin powder or the lining of the polyamide powder is very thin, about 300 μm. Therefore, it is necessary to line the polyethylene resin powder on the inner peripheral surface of the pipe. When the foreign material flows into the fluid passage tube by mixing with the fluid, the coating of the polyethylene resin powder or the polyamide resin powder is broken, and the fluid There was a possibility that the inside of the passage pipe might be corroded.
[0007]
The present invention has been made in view of the above-described problems of the prior art. Even when the pipe is not a straight pipe, both the inner peripheral surface and the outer peripheral face of the pipe are sufficiently prevented from corrosion. And a method for manufacturing the same.
[0008]
[Means for Solving the Problems]
For the above purpose, the present invention relates to a fluid passage tube in which a resin is lined on each of an outer peripheral surface and an inner peripheral surface of a tube, and a film thickness of the resin lined on an inner peripheral surface of the tube. Is a fluid passage tube characterized by being thicker than the resin film lined on the outer peripheral surface of the tube body.
According to the present invention, since the inner peripheral surface of the tubular body has a relatively large thickness, even if, for example, foreign matter is mixed in the fluid, the inner peripheral surface of the tubular body can be protected without breaking the lining. In addition, since the thickness of the resin on the outer peripheral surface of the tube is relatively thin, the resin is lined, thereby preventing the tube from directly contacting the outside world, preventing rust, and preventing an increase in cost. Also, since the resin film on the outer peripheral surface of the tube is relatively thin, the outer surface of the tube may be lined by applying a powdery resin to the outer surface of the tube. However, for example, even in the case of a raw tube such as a cheese tube, an elbow tube, a branch tube, and a one-sided tube, the outer peripheral surface of the tube can be easily lined.
[0009]
Further, the present invention is characterized in that the outer peripheral surface of the tubular body is lined with a polyamide resin, and the inner peripheral surface of the tubular body is lined with a vinyl chloride resin. Corrosion can be sufficiently prevented as compared with the case where a rust preventive paint is applied. Further, since the outer peripheral surface of the tubular body is lined with the polyamide resin, the polyamide resin itself is relatively unlikely to be modified. For example, after the outer peripheral surface of the tubular body is lined with the polyamide resin, the inner circumferential surface of the tubular body is Even if pressure or steam is applied, the fluid passage tube becomes unusable due to the denaturation of the polyamide resin on the outer surface of the tube even if pressure or steam is applied Can be prevented.
[0010]
Further, when the outer peripheral surface of the tube is lined with a polyamide resin powder, the original tube of the fluid passage tube is not a straight tube, for example, a tube such as a cheese tube, an elbow tube, a branch tube, and a single drop tube. Even with a pipe, the outer peripheral surface of the pipe body can be easily lined.
[0011]
In addition, when the inner peripheral surface of the tubular body is lined with a cylindrical vinyl chloride resin, a sufficient thickness can be secured.For example, even if foreign substances are mixed in the fluid, the lining is not broken. The inner peripheral surface of the tube can be protected.
[0012]
Further, the present invention provides a first step of lining a resin on an outer peripheral surface of a tubular body with each of the openings at both ends of the tubular body covered, and a cover attached to both ends of the tubular body. And a third step of lining the inner peripheral surface of the tube with a resin.
[0013]
According to the present invention, the resin is lined with respect to the outer peripheral surface of the tubular body in a state where the lid is attached to each of the openings at both ends of the tubular body, and then the lid is removed, and the inner circumferential surface of the tubular body is removed. Because the resin is lined, before the resin is lined on the inner peripheral surface of the tube, the resin adheres to the inner peripheral surface of the tube, which makes it difficult to line the resin on the inner peripheral surface of the tube. Can be prevented. Also, in this manufacturing method, if the powdery resin is lined on the outer peripheral surface of the tube, and the cylindrical resin is lined on the inner peripheral surface of the tube, the outer surface of the tube is lined. It is easy and the thickness of the lining on the inner peripheral surface of the tube can be increased.
[0014]
Still further, the present invention provides a first step of applying a polyamide resin powder to an outer peripheral surface of a heated tubular body in which each of the openings at both ends is covered with a lid, A second step of removing lids attached to both ends of the pipe, a third step of inserting a tubular polyvinyl chloride resin into the passage of the pipe, and a step of applying pressure and pressure to the vinyl chloride resin inserted into the pipe. And a fourth step of adhering to the tube of the fluid passage tube with steam.
[0015]
According to the present invention, since the outer peripheral surface of the pipe is lined with the polyamide resin powder, the original pipe of the fluid passage pipe is not a straight pipe, for example, a cheese pipe, an elbow pipe, a branch pipe, a single drop pipe, and the like. Even with the original pipe, the outer peripheral surface of the pipe body can be sufficiently protected. In addition, since the outer peripheral surface of the tube is lined with a polyamide resin powder, the outer surface of the tube is less likely to be modified as compared to the case where the outer surface of the tube is lined with a polyethylene resin powder. After lining the surface of the tube with the polyamide resin powder, the inner surface of the tube is lined with a vinyl chloride resin. It is possible to prevent the fluid passage tube from becoming unusable due to the modification. Since the inner peripheral surface of the tube is lined with a tubular polyvinyl chloride resin, a sufficient thickness can be ensured. For example, even if foreign matter is mixed in the fluid, the lining is not destroyed and the inside of the tube is not broken. The surrounding surface can be protected. With the lids attached to each of the openings at both ends of the tube, line the polyamide resin powder on the outer surface of the tube, then remove the cover and remove the cylindrical shape from the inner surface of the tube. Before lining the inner surface of the tube, the polyamide resin powder adheres to the inner surface of the tube before lining the inner surface of the tube. It is possible to prevent the vinyl chloride resin from being difficult to line. Further, after lining the outer surface of the tube with the polyamide resin powder, the inner surface of the tube is lined with a vinyl chloride resin. It is possible to prevent denaturation of the vinyl chloride resin on the inner peripheral surface of the tube, which occurs when the passage tube is baked and the outer peripheral surface of the tube is lined with a polyamide resin powder.
[0016]
BEST MODE FOR CARRYING OUT THE INVENTION
An embodiment of the present invention will be described with reference to the drawings.
1 to 4 show a fluid passage tube 1 according to an embodiment of the present invention.
As a fluid passage tube 1 according to an embodiment of the present invention, as shown in FIGS. 1 and 2, a so-called elbow tube 3 having a tube body 2 bent at an angle such as 90 degrees or 45 degrees on the way, FIGS. , A so-called cheese tube 4 provided with a tube 2 to which another tube 2 is joined in the middle, a so-called one-sided tube provided with a tube 2 having a variable thickness as shown in FIG. 5. There is a so-called branch pipe (not shown) provided with a pipe body 2 whose tip end branches into a plurality.
[0017]
The original pipe 11 of the fluid passage pipe 1 is constituted by the iron pipe 2 and the disc-shaped flange 6 joined to both ends thereof. The original tube 11 for manufacturing various types of fluid passage tubes 1 such as the elbow tube 3, the cheese tube 4, the drop tube 5, and the branch tube is commercially available, and the original tube 11 is purchased according to the application. I do.
The polyamide resin 7 is lined with a thickness of 300 μm (0.3 mm) on the entire outer peripheral surface 2 a of the tube 2 and on the entire portion 6 b of the flange 6 other than the vicinity 6 a of the opening of the tube 2. ing.
[0018]
In the original tube 11, a portion of the inner peripheral surface 2b of the tube 2 and the flange 6 near the opening 2a of the tube 2 is lined with a vinyl chloride resin 8 to a thickness of 1 mm or more.
The part lined with the polyamide resin 7 and the part lined with the vinyl chloride resin 8 are in contact with each other, and all parts of the raw tube 11 are lined with the polyamide resin 7 or the vinyl chloride resin 8.
[0019]
Next, a method of manufacturing the fluid passage tube 1 according to the embodiment of the present invention will be described with reference to FIGS.
First, as shown in FIG. 5A, a commercially available iron raw tube 11 is prepared. Here, in particular, the original tube 11 of the elbow tube 3 in which the tube 2 is bent at an angle of 90 degrees from the middle is prepared. Flanges 6 are welded to both ends of the tube 2.
[0020]
Next, an adhesive is applied to the entire outer peripheral surface 2a of the tube 2 and the portion 6b of the flange 6 other than the vicinity 6a of the opening of the tube 2 in the original tube 11.
Then, as shown in FIG. 5B, masking is performed by attaching lids 9 to each of the openings at both ends of the tubular body 2.
Thereafter, the fluid passage tube 1 is baked.
[0021]
Then, as shown in FIG. 5 (c), the baked original tube 11 is immersed in the powder of the polyamide resin 7 which is placed in a tank and stirred by blowing air to form the tube 2 The outer peripheral surface 2a and a portion 6b of the flange 6 other than the vicinity 6a of the opening of the pipe are lined with a polyamide resin powder. At this time, since the lids 9 are attached to the openings at both ends of the tubular body 2, the powder of the polyamide resin 7 does not enter the inside of the original tube 11, and the inside of the original tube 11 is lined with the powder of the polyamide resin 7. Not done.
[0022]
Thereafter, as shown in FIG. 5D, the lid 9 attached to the opening at both ends of the tube 2 is removed, and the inner peripheral surface 2b of the tube 2 is cleaned to remove oil, dust, and the like. I do.
Then, an adhesive is applied to the inner peripheral surface 2b of the tube 2. At this time, the adhesive is also applied to the portion 6a of the flange 6 near the opening of the tube 2.
[0023]
Then, as shown in FIG. 5 (e), the cylindrical pipe 10 of the hard vinyl chloride resin 8 is inserted into the inside of the pipe 2. At this time, the length of the pipe 10 of the hard vinyl chloride resin 8 is longer than the length of the passage of the original pipe 11, and both ends of the pipe 10 of the hard vinyl chloride resin 8 protrude from both ends of the original pipe 11.
[0024]
Then, as shown in FIG. 5 (e), pressure and steam are applied to the raw tube 11 to expand the pipe 10 of the hard vinyl chloride resin 8, so that the inner peripheral surface 2 b of the pipe 2 has vinyl chloride. Lining resin 8. At this time, both ends of the pipe 10 of the hard vinyl chloride resin 8 are fixed to the flange 6.
[0025]
As a result, the entire peripheral surface of the raw pipe 11 is lined with the polyamide resin 7 or the vinyl chloride resin 8.
As described above, the elbow tube 3 as the fluid passage tube 1 in which the polyamide resin 7 is lined on the outer peripheral surface 2a of the tube 2 and the vinyl chloride resin 8 is lined on the inner peripheral surface 2b of the tube 2 is manufactured. You.
[0026]
As described above, according to the present invention, the outer peripheral surface 2a of the tube 2 is lined with a relatively thin polyamide resin 7, and the inner peripheral surface 2b of the tube 2 is formed of a relatively thick film. It is characterized in that a vinyl chloride resin 8 is lined. Thus, since the inner peripheral surface 2b of the tube 2 has a relatively large thickness, even if, for example, foreign matter is mixed in the fluid, the inner peripheral surface 2b of the tube 2 can be protected without breaking the lining. In addition, since the resin film on the outer peripheral surface 2a of the tube 2 is relatively thin, it is possible to prevent the tube 2 from directly contacting the outside to prevent rust, and to prevent cost increase due to the small film thickness. .
[0027]
Further, according to the present invention, the outer peripheral surface 2a of the tube 2 is lined with a polyamide resin 7, and the inner peripheral surface 2b of the tube 2 is lined with a vinyl chloride resin 8. Therefore, corrosion can be sufficiently prevented as compared with the case where the outer peripheral surface 2a of the tube 2 is galvanized or the case where a rust preventive paint is applied. Further, since the outer peripheral surface 2a of the tubular body 2 is lined with the polyamide resin powder 7, the polyamide resin itself is relatively unlikely to be modified. After lining, the inner surface 2b of the tube 2 is lined with the vinyl chloride resin 8, so that even if pressure or steam is applied, compared to the case where polyethylene powder is lined on the outer surface 2a of the tube 2, It is possible to prevent the fluid passage tube 1 from becoming unusable due to the modification of the polyamide powder 7 on the outer peripheral surface 2a of the tube body 2. Further, since the outer peripheral surface 2a of the tube 2 is lined with the powder of the polyamide resin 7, the original tube 11 of the fluid passage tube 1 is not a straight tube, for example, a cheese tube 4, an elbow tube 3, a branch tube, and a piece. The outer peripheral surface 2a of the pipe body 2 can also be easily lined with the original pipe 11 such as the falling pipe 5. Since the inner peripheral surface 2b of the tube 2 is lined with the vinyl chloride resin 8, a sufficient thickness can be ensured. For example, even if foreign matter is mixed in the fluid, the lining is not broken and the tube 2 is The inner peripheral surface 2b can be protected.
[0028]
Further, according to the present invention, the powder of polyamide resin 7 is applied to the outer peripheral surface 2a of the heated tube 2 in a state where the lid 9 is attached to each of the openings at both ends of the tube 2. A first step, a second step of removing the lids 9 attached to both ends of the tube 2, a third step of inserting the tubular vinyl chloride resin 8 into the passage of the tube 2, A fourth step of fixing the vinyl chloride resin 8 inserted into the body 2 to the inner peripheral surface 2b of the tube body 2 with pressure and steam. is there.
[0029]
According to the present invention, since the outer peripheral surface 2a of the tube 2 is lined with the powder of the polyamide resin 7, the original tube 11 of the fluid passage tube 1 is not a straight tube, for example, the cheese tube 4, the elbow tube 3, The outer peripheral surface 2a of the pipe 2 can be sufficiently protected even with the original pipe 11 such as the branch pipe or the single drop pipe 5. Further, since the outer surface 2a of the tube 2 is lined with the powder of the polyamide resin 7, the outer surface 2a of the tube 2 is less likely to be denatured as compared with the case where the outer surface 2a of the tube 2 is lined with the powder of the polyethylene resin. After lining the outer surface 2a of the tube 2 with the powder of the polyamide resin 7, the inner surface 2b of the tube 2 is lined with the vinyl chloride resin 8. Of the lining of the polyamide powder 7 on the outer peripheral surface 2a can be prevented from becoming unusable. Since the inner peripheral surface 2b of the tube body 2 is lined with the cylindrical vinyl chloride resin 8, a sufficient thickness can be ensured. For example, even if foreign matter is mixed in the fluid, the lining is not broken and the tube is not broken. The inner peripheral surface 2b of the body 2 can be protected. With the lid 9 attached to each of the openings at both ends of the tubular body 2, the outer surface 2 a of the tubular body 2 is lined with the powder of the polyamide resin 7, and then the lid 9 is removed to remove the tubular body 2. Since the vinyl chloride resin 8 is lined with the inner peripheral surface 2b, the powder of the polyamide resin 7 is coated on the inner peripheral surface 2b of the tube 2 before the vinyl chloride resin 8 is lined with the inner peripheral surface 2b of the tube 2. It is possible to prevent the vinyl chloride resin 8 from being attached to the inner peripheral surface 2b of the tubular body 2 and making it difficult to line it. Further, after the outer peripheral surface 2a of the tube 2 is lined with the powder of the polyamide resin 7, the inner peripheral surface 2b of the tube 2 is lined with the cylindrical vinyl chloride resin 8, so that the inner peripheral surface of the tube 2 After the raw tube 11 is baked after the vinyl chloride resin 8 is lined with the polyvinyl chloride resin 2b, the inner peripheral surface 2b of the tube 2 Modification of the vinyl resin 8 can be prevented.
[0030]
【The invention's effect】
As described above, according to the present invention, according to the present invention, there is provided a fluid passage tube in which a resin is lined on each of an outer peripheral surface and an inner peripheral surface of a tube, and a resin lined on an inner peripheral surface of the tube. Wherein the thickness of the fluid passage pipe is greater than the thickness of the resin lining the outer peripheral surface of the pipe body.
[0031]
According to the present invention, since the inner peripheral surface of the tubular body has a relatively large thickness, even if, for example, foreign matter is mixed in the fluid, the inner peripheral surface of the tubular body can be protected without breaking the lining. In addition, since the thickness of the resin on the outer peripheral surface of the tube is relatively thin, the resin is lined, thereby preventing the tube from directly contacting the outside world, preventing rust, and preventing an increase in cost. Also, since the resin film on the outer peripheral surface of the tube is relatively thin, the outer surface of the tube may be lined by applying a powdery resin to the outer surface of the tube. However, for example, even in the case of a raw tube such as a cheese tube, an elbow tube, a branch tube, and a one-sided tube, the outer peripheral surface of the tube can be easily lined.
[0032]
In addition, the present invention is characterized in that the outer peripheral surface of the tube is lined with a polyamide resin, and the inner peripheral surface of the tube is lined with a vinyl chloride resin. Corrosion can be sufficiently prevented as compared with the case where a rust preventive paint is applied. Further, since the outer peripheral surface of the tubular body is lined with the polyamide resin, the polyamide resin itself is relatively unlikely to be modified. For example, after the outer peripheral surface of the tubular body is lined with the polyamide resin, the inner circumferential surface of the tubular body is Even if pressure or steam is applied, the fluid passage tube becomes unusable due to the denaturation of the polyamide resin on the outer surface of the tube even if pressure or steam is applied Can be prevented.
[0033]
Further, when the outer peripheral surface of the tube is lined with a polyamide resin powder, the original tube of the fluid passage tube is not a straight tube, for example, a tube such as a cheese tube, an elbow tube, a branch tube, and a single drop tube. Even with a pipe, the outer peripheral surface of the pipe body can be easily lined.
[0034]
In addition, when the inner peripheral surface of the tubular body is lined with a cylindrical vinyl chloride resin, a sufficient thickness can be secured.For example, even if foreign substances are mixed in the fluid, the lining is not broken. The inner peripheral surface of the tube can be protected.
[0035]
Further, the present invention provides a first step of lining a resin on an outer peripheral surface of a tubular body with each of the openings at both ends of the tubular body covered, and a cover attached to both ends of the tubular body. And a third step of lining the inner peripheral surface of the tube with a resin.
[0036]
According to the present invention, the resin is lined with respect to the outer peripheral surface of the tubular body in a state where the lid is attached to each of the openings at both ends of the tubular body, and then the lid is removed, and the inner circumferential surface of the tubular body is removed. Because the resin is lined, before the resin is lined on the inner peripheral surface of the tube, the resin adheres to the inner peripheral surface of the tube, which makes it difficult to line the resin on the inner peripheral surface of the tube. Can be prevented.
[0037]
Still further, the present invention provides a first step of applying a polyamide resin powder to an outer peripheral surface of a heated tubular body in which each of the openings at both ends is covered with a lid, A second step of removing lids attached to both ends of the pipe, a third step of inserting a tubular polyvinyl chloride resin into the passage of the pipe, and a step of applying pressure and pressure to the vinyl chloride resin inserted into the pipe. And a fourth step of adhering to the tube of the fluid passage tube with steam.
[0038]
According to the present invention, since the outer peripheral surface of the pipe is lined with the polyamide resin powder, the original pipe of the fluid passage pipe is not a straight pipe, for example, a cheese pipe, an elbow pipe, a branch pipe, a single drop pipe, and the like. Even with the original pipe, the outer peripheral surface of the pipe body can be sufficiently protected. In addition, since the outer peripheral surface of the tube is lined with a polyamide resin powder, the outer surface of the tube is less likely to be modified as compared to the case where the outer surface of the tube is lined with a polyethylene resin powder. After lining the surface of the tube with the polyamide resin powder, the inner surface of the tube is lined with a vinyl chloride resin. It is possible to prevent the fluid passage tube from becoming unusable due to the modification. Since the inner peripheral surface of the tube is lined with a tubular polyvinyl chloride resin, a sufficient thickness can be ensured. For example, even if foreign matter is mixed in the fluid, the lining is not destroyed and the inside of the tube is not broken. The surrounding surface can be protected. With the lids attached to each of the openings at both ends of the tube, line the polyamide resin powder on the outer surface of the tube, then remove the cover and remove the cylindrical shape from the inner surface of the tube. Before lining the inner surface of the tube, the polyamide resin powder adheres to the inner surface of the tube before lining the inner surface of the tube. It is possible to prevent the vinyl chloride resin from being difficult to line. Further, after lining the outer surface of the tube with the polyamide resin powder, the inner surface of the tube is lined with a vinyl chloride resin. It is possible to prevent denaturation of the vinyl chloride resin on the inner peripheral surface of the tube, which occurs when the passage tube is baked and the outer peripheral surface of the tube is lined with a polyamide resin powder.
[Brief description of the drawings]
FIG. 1 is a perspective view showing an elbow pipe which is a fluid passage pipe according to an embodiment of the present invention.
FIG. 2 is a cross-sectional view showing an elbow pipe which is a fluid passage pipe according to the embodiment of the present invention.
FIG. 3 is a cross-sectional view showing a one-sided pipe which is a fluid passage pipe according to the embodiment of the present invention.
FIG. 4 is a cross-sectional view showing a cheese tube which is a fluid passage tube according to the embodiment of the present invention.
FIG. 5 is a view showing a manufacturing process of an elbow pipe which is a fluid passage pipe according to the embodiment of the present invention.
[Explanation of symbols]
REFERENCE SIGNS LIST 1 fluid passage pipe 2 pipe 2 a pipe outer peripheral surface 2 b pipe inner peripheral surface 3 elbow pipe 4 cheese pipe 5 one-sided pipe 6 flange 7 polyamide resin 8 vinyl chloride resin 9 lid 10 pipe 11 original pipe

Claims (6)

A fluid passage tube in which a resin is lined on each of an outer peripheral surface and an inner peripheral surface of the tube, wherein a film thickness of the resin lined on the inner peripheral surface of the tube is lined on an outer peripheral surface of the tube. A fluid passage tube characterized by being thicker than the thickness of the resin. The fluid passage tube according to claim 1, wherein the end portion is provided with a flange, and the shape of the fluid passage tube changes in the middle of the tube. A tube that is bent in the middle, or a tube in which another tube is joined in the middle, or a tube whose thickness changes, or a tube whose tip end is branched into a plurality The fluid passage tube according to claim 2, further comprising: The fluid passage tube according to any one of claims 1 to 4, wherein the outer peripheral surface of the tube is lined with a polyamide resin, and the inner peripheral surface of the tube is lined with a vinyl chloride resin. A first step of lining the resin on the outer peripheral surface of the tube in a state in which each of the openings at both ends of the tube is covered,
A second step of removing lids attached to both ends of the tube;
A third step of lining the inner peripheral surface of the tube with a resin,
A method for manufacturing a fluid passage tube, comprising: A first step of applying a polyamide resin powder to the outer peripheral surface of the heated tubular body in a state where each of the openings at both ends is covered with a lid,
A second step of removing lids attached to both ends of the tube;
A third step of inserting a cylindrical polyvinyl chloride resin into the passage of the tubular body;
A fourth step of fixing the vinyl chloride resin inserted into the pipe to the pipe of the fluid passage pipe by pressure and steam;
A method for manufacturing a fluid passage tube, comprising:

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