JPH09317954A - Insertion pipe - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress vibration due to a water hammer phenomenon, and prevent occurrence of an impulsive sound due to the collision of a insertion pipe with a sleeve pipe, by smoothly inserting the insertion pipe in the sleeve pipe. SOLUTION: An outer layer 12 formed of a urethan thermoplastic elastomer is laminated on a cylindrical crosslinking polyethylene-made inner layer 11, and five projected grooves 13 projected outwardly from the peripheral surface of the outer layer 12, are integrally formed with the outer layer 12. Respective projected grooves 13 are formed linearly along the longitudinal direction of the outer layer 12.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention
The present invention relates to an insertion tube that is inserted into a sheath tube that is preliminarily installed on a floor surface or a wall surface.

[0002]

2. Description of the Related Art Water supply pipes and hot water supply pipes used in houses and the like are usually arranged on a concrete floor surface or wall surface in a building by a sheath pipe header method. In the sheath pipe header construction method, the sheath pipe is preliminarily piped in the concrete floor surface from the header of the water pipe and the hot water pipe to a predetermined place such as a kitchen or a washroom, and the water pipe is inserted in the sheath pipe. Alternatively, an insertion tube, which is a hot water supply tube, is inserted.

In an insertion pipe such as a water supply pipe laid by such a sheath pipe header construction method, the water pressure may suddenly fluctuate in the water supply tap or in the vicinity of the water supply tap due to opening and closing of the water supply tap or the hot water supply tap. . When the water pressure abruptly changes in the insertion tube, a water hammer phenomenon occurs in which the water flowing through the insertion tube collides with the inner peripheral surface of the insertion tube due to the reaction. When the water hammer phenomenon occurs, there is a problem that the insertion tube vibrates greatly, collides with the sheath tube, and a large impact sound is generated.

In order to prevent the generation of such impact noise, for example, in JP-A-3-292487 and JP-A-4-316786, a sheet-shaped cushioning material is wound around an insertion tube to be inserted into a sheath tube. A configuration is disclosed in which the insertion tube is fixed in the sheath tube by insertion.

Further, Japanese Utility Model Laid-Open No. 2-87195 discloses that
A configuration is disclosed in which a cylindrical cushioning material is provided on the inner peripheral surface of the sheath tube and the sheath tube is inserted into the cushioning material.

Further, Japanese Patent Application Laid-Open No. 6-212490 discloses a structure in which a tubular or rod-shaped cushioning material is inserted into the sheath tube together with the insertion tube.

[0007]

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention
In the configurations disclosed in JP-A-7 and JP-A-4-316786, the insertion tube is inserted into the sheath tube while the sheet-shaped cushioning material is wound around the insertion tube or while the cushioning material is wound around the insertion tube. However, there is a problem in that it is not easy to insert the inner tube into the sheath tube. Further, in order to reliably prevent the generation of impact noise due to the vibration of the insertion tube, the thickness of the sheet-shaped cushioning material must be increased, and therefore, the insertion tube wrapped with the cushioning material should be placed inside the sheath tube. The work of inserting it becomes more difficult. Further, in order to fix the tip portion of the cushioning material wound around the insertion tube to the insertion tube, a tape has to be attached, and the work for that is further required. Further, when the lubricant is applied to the outer peripheral surface of the cushioning material so that the insertion tube around which the cushioning material is wound is smoothly inserted into the sheath tube, further application of the lubricant is required, Further, the tape applied to fix the cushioning material to the insertion tube may be peeled off by the lubricant applied to the cushioning material.

In the construction disclosed in Japanese Utility Model Laid-Open No. 2-87195, the insertion tube has to be inserted into the cushioning material provided in the sheath tube, and therefore, it follows. When the inner diameter of the cushioning material is small, the insertion tube may not be inserted smoothly. On the other hand, if the inner diameter of the cushioning material becomes large, it may not be possible to reliably prevent the vibration of the insertion tube, and it may not be possible to sufficiently prevent the generation of impact noise. Not easy to set up.

In the structure disclosed in Japanese Patent Laid-Open No. 6-221490, since the tubular or rod-shaped cushioning material is inserted into the sheath tube together with the insertion tube, when the outer diameter of the cushioning material increases, the insertion tube and the cushioning material May not be able to be smoothly inserted into the sheath tube, and conversely, if the outer diameter of the cushioning material becomes large, the vibration of the insertion tube cannot be reliably prevented, and the impact noise cannot be sufficiently prevented. There is a risk.
Therefore, also in this case, there is a problem that it is not easy to properly set the outer diameter of the cushioning material.

The present invention is intended to solve such a problem, and an object thereof is to be able to smoothly insert it into a sheath tube and to reliably suppress vibration due to the water hammer phenomenon. An object of the present invention is to provide an insertion tube capable of reliably preventing the generation of impact noise caused by collision with a sheath tube.

[0011]

The inner tube according to the present invention is an inner tube which is inserted into a sheath tube which has been previously piped to be piped into the sheath tube. The inner layer portion is formed of resin into a cylindrical shape. And an outer layer portion that covers the outer peripheral surface of the inner layer portion and is made of a thermoplastic resin composition having elasticity, and projects outward from the outer peripheral surface of the outer layer portion, along the longitudinal direction of the outer layer portion. And a protrusion formed integrally with the outer layer portion so as to have a linear shape.

According to a second aspect of the present invention, the thermoplastic resin composition has a hardness Shore A of 95 or less.

In the insertion tube according to the third aspect, the interface between the inner layer portion and the outer layer portion is in a peelable state.

According to the fourth aspect of the present invention, in the insertion tube, the protrusion is
It is linear along the axial direction of the outer layer portion.

According to the fifth aspect of the insertion tube, the protrusion is
It has a spiral shape.

In the insertion tube according to claim 6, the thermoplastic resin composition is selected from thermoplastic elastomer, soft polyvinyl chloride, and ethylene-vinyl acetate copolymer.

In the inner tube according to the seventh aspect, a coating layer made of a thermoplastic resin containing a lubricant is formed on the surface of the ridge.

According to the eighth aspect of the insertion tube, the protrusion is
It consists of a thermoplastic resin containing a lubricant.

In the inner tube according to the ninth aspect, a coating layer made of a thermoplastic resin containing a lubricant is formed on the surfaces of the ridge and the outer layer portion.

[0020]

Embodiments of the present invention will be described below in detail with reference to the drawings.

FIG. 1 is a sectional view showing an example of an embodiment of the insertion tube of the present invention. The inner tube 10 is used by being inserted into a sheath tube, and has a cylindrical inner layer portion 11
And an outer layer portion 12 laminated on the outer peripheral surface of the inner layer portion 11 so as to cover the inner layer portion 11. Inner layer 11
Is made of, for example, crosslinked polyethylene. The outer layer portion 12 is composed of a thermoplastic resin composition having a hardness Shore A of 95 or less, for example, an olefin-based thermoplastic elastomer such as polyethylene-polypropylene-ethylene propylene rubber (EPDM).

On the outer peripheral surface of the outer layer portion 12, five ridges 13 radially protruding outward are provided in a straight line along the longitudinal direction at equal intervals in the circumferential direction. Like the outer layer portion 12, each of the ridges 13 is made of an olefin thermoplastic elastomer having a hardness Shore A of 95 or less, and the outer layer portion 1
It is formed integrally with 2. Each of the ridges 13 has a sharp cross-sectional shape in which the dimension in the width direction is gradually reduced toward the tip side, and the tip is sharp.

The above-mentioned inner pipe 10 is used as a water supply pipe or a hot water supply pipe, and is arranged at a predetermined place in a building by the sheath pipe header method. In the sheath pipe header construction method, only the sheath pipe is laid in advance on the concrete floor surface of the building or the concrete wall surface, and the insertion pipe 10 is inserted into the sheath pipe to Piped.

The inner tube 10 to be inserted into the sheath tube is inserted into the sheath tube by sliding the tip ends of the protrusions 13 integrally formed with the outer layer portion 12 to the inner peripheral surface of the sheath tube, and the sheath tube is inserted. Insert the inside of the tube. Since only the tips of the protrusions 13 are in contact with the inner peripheral surface of the sheath tube, the frictional force with the inner peripheral surface of the sheath tube is small, and the insertion tube 10 is smoothly inserted into the sheath tube.

The inner layer pipe 10 inserted through the sheath pipe is used as a water supply pipe or a hot water supply pipe. The water tap or a portion in the vicinity of the hot water tap has a water pressure inside when the water tap or the hot water tap is opened and closed. Due to the abrupt change, the insertion tube 10 tends to vibrate greatly. However, the intubation 10
Since each ridge 13 integrally formed with the outer layer portion 12 is in contact with the inner peripheral surface of the sheath tube, the vibration of the insertion tube 10 is suppressed by each ridge 13. As a result, it is possible to reliably prevent the generation of impact noise caused by the collision of the insertion tube 10 with the sheath tube.

In this case, since the outer layer portion 12 formed integrally with each of the ridges 13 is made of an olefinic thermoplastic elastomer excellent in elasticity and having a hardness Shore A 95 or less, each of the ridges 13 for the sheath tube is formed. The impact of the outer layer 12
Is absorbed by the inner tube 10 and the shock noise between the inner tube 10 and the sheath tube is more reliably prevented.

The wall thickness of the outer layer portion 12 is preferably about 0.2 to 3.0 mm in consideration of moldability and workability when it is inserted into the sheath tube. If the thickness of the outer layer portion 12 is thin, the moldability may be poor, and it may not be possible to mold it to a predetermined thickness, and the insertion tube may be broken or damaged when it is inserted into the sheath tube. . On the contrary, when the thickness of the outer layer portion 12 becomes large, it becomes impossible to easily insert the insertion tube into the sheath tube, and the workability for that purpose is significantly reduced.

Each ridge 13 formed integrally with the outer layer portion 12
Has a protrusion length (height) from the outer layer 12 of 0.5 to 8.0.
mm is preferable. When the height of each ridge 13 becomes smaller,
When the insertion tube 10 is inserted into the sheath tube, the gap with the inner peripheral surface of the sheath tube becomes too large, and the impact noise between the insertion tube 10 and the sheath tube due to the water hammer phenomenon cannot be sufficiently suppressed. On the contrary, when the height of each protrusion 13 becomes large, it is not easy to insert the insertion tube 10 into the sheath tube, and the workability thereof decreases.

Outer layer portion 12 integrally formed with each protrusion 13.
Is a thermoplastic resin composition having a hardness Shore A of 95 or less. As such a thermoplastic resin composition,
A typical example is a thermoplastic elastomer, which is a polymer material having properties intermediate between those of plastics and rubber, and which is easily plasticized at room temperature and can be freely shaped. Polyethylene-polypropylene-ethylene propylene rubber (EPD
Styrene represented by olefins such as M) and polystyrene-polybutadiene teleblock copolymers (TP)
S) type, urethane (TPU) type, ester (TPEE)
System, polyamide system, natural rubber system, etc. Further, not limited to such a thermoplastic elastomer, soft polyvinyl chloride, ethylene-vinyl acetate copolymer (EVA) and the like may be used.

A lubricant may be applied to the surface of the ridges 13 or the outer layer 12 so that the insertion tube 10 can be smoothly inserted into the sheath tube. A lubricant may be added to the composition. As the lubricant, those used in ordinary resin molding may be used, and, for example, fatty acid amide, calcium stearate, zinc stearate, silicone oil, fluorine-based lubricant and the like are used. Such a lubricant may be added as a simple substance at the time of molding the outer layer portion 12 and the ridges 13, but may be mixed and kneaded with the resin components constituting the outer layer portion 12 and the ridges 13 in advance to obtain a masterbatch. You may make it add. In particular, it is preferable to add a lubricant to the thermoplastic resin composition forming the protrusion 13.

The inner insertion tube 10 is not limited to the structure in which the five protrusions 13 are integrally formed with the outer layer portion 12 as shown in FIG. 1, and as shown in FIG. Alternatively, the three protrusions 13 may be linearly provided along the longitudinal direction of the outer layer portion 12.

Further, as shown in FIGS. 3 (a) and 3 (b), one protrusion 13 is formed on the outer peripheral surface of the outer layer portion 12 and the outer layer portion 1 is formed.
It is good also as a structure provided in the spiral line along the longitudinal direction of 2.

Furthermore, the protrusion 13 integrally formed with the outer layer portion 12 does not have to be continuous and may be in a discontinuous state.

Further, as shown in FIG. 4, a coating layer 14 made of a thermoplastic resin containing a lubricant is formed on the surface of the protrusion 13.
May be formed.

Further, as shown in FIG. 5, a coating layer 14 made of a thermoplastic resin containing a lubricant may be further formed on the surfaces of the outer layer portion 12 and the ridges 13 of the insertion tube.

Further, the inner tube portion 10 may be configured such that the inner layer portion 11 and the outer layer portion 12 can be easily separated.
In this way, if the inner layer portion 11 and the outer layer portion 12 can be easily peeled off, as shown in FIG. 4, the outer layer portion 12 is peeled off from the inner layer portion 11 at the end of the insertion tube 10, It can be easily inverted so that the inner layer portion 11 is exposed. The inner insertion tube 10 with the inner layer portion 11 exposed can be easily connected to other pipes even if the outer layer portion 12 is provided with the protrusion 13.

As shown in FIG. 5, the insertion tube 10 in which the inner layer portion 11 and the outer layer portion 12 can be easily separated from each other is formed after the inner layer portion 11 is formed by extrusion 21 as shown in FIG. The inner layer portion 11 is cooled by the cooling water in the cooling water tank 22, and then, by the crosshead die 23.
A cooling water tank 24 is formed by covering the outer tank portion 12 having the ridges 13.
It can be manufactured by cooling with the cooling water inside.

[0038]

EXAMPLES Details of the present invention will be described with reference to examples. (Example 1) In a production line of a cross-linked polyethylene pipe having an outer diameter of 13.0 mm and an inner diameter of 10.2 mm, an olefinic thermoplastic elastomer having a hardness Shore A of 55 was extruded into a crosshead die to obtain a cross section shown in FIG. A shaped insertion tube 10 was manufactured. The inner tube 10 has a thickness of the outer layer 12 of 0.4.
mm, height of the ridge 13 from the outer layer 12 is 2.0 mm, ridge 1
The widthwise dimension of the outer peripheral surface of the outer layer portion 12 of No. 3 is 0.4 mm.

A noise measurement test by the water hammer phenomenon of the manufactured intubation tube 10 was carried out. In the noise measurement test, a flexible sheath tube with a nominal diameter of 22 mm, an outer diameter of 27.5 mm, a minimum inner diameter of 22.1 mm, and a total piping length of 6.5 mm was installed in the central part (3 m from each end face). And the radius of curvature is 450R
It was used after being bent only once so that The sheath tube was installed in a room with a background noise of 50 dB and fixed with a saddle.
Then, the insertion tube 10 was inserted into the sheath tube. A solenoid valve (response time: 150 ms) was attached to one end of the insertion tube 10, and when the solenoid valve was opened, water having a flow rate of 14 liters / minute was allowed to flow through the insertion tube 10. Then, a microphone was installed at a position 1 cm above the sheath tube, and the noise generated when the solenoid valve was opened and closed was measured. For the measurement, a precision sound level meter (RION, trade name "NA-29E") was used.
As the evaluation of the measurement, the A characteristic sound pressure level
Adopted peak level. Noise measurement result is 59.4 dB
Met. The results are shown in Table 1.

Furthermore, as shown in FIG. 6, a sheath pipe having a nominal diameter of 22 mm, an outer diameter of 27.5 mm, a minimum inner diameter of 22.1 mm, and a total pipe length of 5.5 mm has a radius of curvature of 450 R at four locations every 1 m. And bent at a right angle with a radius of curvature of 450R so that a 0.5 m rising portion was formed at the final end.
Then, the obtained insertion tube 10 was inserted into the sheath tube from the end opposite to the rising portion. The endotracheal tube 10 could be completely inserted even to the final rising portion. The results are shown in Table 1 by a circle.

(Example 2) An intubation tube 10 was manufactured in the same manner as in Example 1 except that an olefin thermoplastic elastomer having a hardness of A77 was used as the ridge 13 and the outer layer portion 12. did.

The noise measurement result of the manufactured intubation tube 10 is 6
It was 4.4 dB. Also, in the insertion test, it was possible to completely insert the inside of the sheath tube to the rising portion.
The results are also shown in Table 1.

(Example 3) An inner insertion tube 10 was manufactured in the same manner as in Example 1 except that an olefin thermoplastic elastomer having a hardness of A85 was used as the ridge 13 and the outer layer portion 12. did.

The noise measurement result of the manufactured intubation tube is 67.4.
dB. Also, in the insertion test, it was possible to completely insert the sheath tube up to the rising portion. Table 1 shows the results
Also described in.

(Example 4) As the thermoplastic resin composition forming the ridges 13 and the outer layer portion 12, a soft polyvinyl chloride having a hardness Shore A65 was used, and as shown in FIG. Example 1 except that three linear ridges 13 having a diameter of 3 mm were provided in parallel at equal intervals in the circumferential direction.
The intubation tube 10 was manufactured in the same manner as.

The noise measurement result of the manufactured intubation tube 10 is
It was 62.5 dB. Also, in the insertion test, it was possible to completely insert the sheath tube up to the rising portion. The results are also shown in Table 1.

(Example 5) As the thermoplastic resin composition constituting the ridges 13 and the outer layer portion 12, an ethylene-vinyl acetate copolymer having a hardness Shore A87 was used and the protrusion height of the ridges 13 was changed. An inner tube 10 was manufactured in the same manner as in Example 4 except that the length was 5.0 mm.

The noise measurement result of the manufactured intubation tube 10 is as follows.
It was 61.5 dB. Also, in the insertion test, it was possible to completely insert the sheath tube up to the rising portion. The results are also shown in Table 1.

(Example 6) As the thermoplastic resin composition constituting the ridges 13 and the outer layer portion 12, the olefinic thermoplastic elastomer used in Example 2 was used, and as shown in FIG. The thickness of the portion 12 is 0.7 mm, and one protrusion 13 having a protrusion height of 4.5 mm is spirally provided on the outer peripheral surface of the outer layer portion 12. In addition, the outer layer portion 12 of the ridge 13
The widthwise dimension of the outer peripheral surface was 0.7 mm. Other than these, the intubation tube 10 was manufactured in the same manner as in Example 1.

The noise measurement result of the manufactured intubation tube 10 is as follows.
It was 56.9 dB. Also, in the insertion test, it was possible to completely insert the sheath tube up to the rising portion. The results are also shown in Table 1.

(Embodiment 7) The protrusion height of the protrusion 13 is 0.5 mm.
The same procedure as in Example 2 except for the above.
Was manufactured.

The noise measurement result of the manufactured intubation tube 10 is
It was 70.9 dB. Also, in the insertion test, it was possible to completely insert the sheath tube up to the rising portion. The results are also shown in Table 1.

(Embodiment 8) The protrusion height of the protrusion 13 is set to 12.0 mm.
The same procedure as in Example 2 except for the above.
Was manufactured.

The noise measurement result of the manufactured intubation tube 10 is
It was 54.2 dB. In addition, in the insertion test, it was possible to insert up to the rising portion, but the ridge 13 was found to be damaged from the root. The results are also shown in Table 1 as Δ marks.

(Example 9) As the olefinic thermoplastic elastomer constituting the ridges 13 and the outer layer portion 12, one having hardness Shore A92 was used, and the protrusion height of the ridges 13 was adjusted.
An intubation tube 10 was manufactured in the same manner as in Example 1 except that the length was 6.5 mm.

The noise measurement result of the manufactured intubation tube 10 is
It was 71.2 dB. Also, in the insertion test, it was possible to completely insert the sheath tube up to the rising portion. The results are also shown in Table 1.

(Embodiment 10) The ridges 13 and the outer layer portion 12
As an olefinic thermoplastic elastomer that constitutes
Using a hardness Shore A55, the protrusion height of the ridge 13 is set to 2.0 mm, and as shown in FIG. 4, two-layer extrusion is performed to obtain 90% by weight of an olefinic thermoplastic elastomer,
A coating layer composed of 10% by weight of low-density polyethylene containing 50% by weight of a silicone oil type lubricant (hardness Shore A5
9 and a thickness of 0.1 mm) 14 was formed on the surface of the ridge 13 in the same manner as in Example 1 to produce the insertion tube 10.

The noise measurement result of the manufactured intubation tube 10 is
It was 61.8 dB. Also, in the insertion test, it was possible to completely insert the sheath tube up to the rising portion. The results are also shown in Table 1.

(Example 11) As the thermoplastic resin constituting the outer layer portion 12, soft polyvinyl chloride having a hardness Shore A65 was used, and as the resin constituting the ridges, 90% by weight of an olefinic thermoplastic elastomer and a fatty acid were used. 10% by weight of low-density polyethylene containing 20% by weight of amide lubricant
An intubation tube 10 was manufactured in the same manner as in Example 4 except that a resin (hardness Shore A62) consisting of and was used.

The noise measurement result of the manufactured insertion tube 10 is as follows.
It was 64.1 dB. Also, in the insertion test, it was possible to completely insert the sheath tube up to the rising portion. The results are also shown in Table 1.

(Embodiment 11) Outer layer portion 13 and outer layer portion 12
As an olefinic thermoplastic elastomer that constitutes
Using a hardness Shore A55, three linear ridges 13 with a protrusion height of 4.6 mm are provided in parallel at equal intervals in the circumferential direction, and further two layers are extruded, as shown in FIG. As shown, 90% by weight of the olefinic thermoplastic elastomer,
A layer (hardness Shore A54, thickness 0.1 mm) 14 composed of 10% by weight of an olefinic thermoplastic elastomer containing 50% by weight of a silicone oil type lubricant is formed on the protrusion 13 and the outer layer portion 12.
Except that it was formed on the surface of
The intubation tube 10 was manufactured.

The noise measurement result of the manufactured intubation tube 10 is
It was 62.1 dB. Also, in the insertion test, it was possible to completely insert the sheath tube up to the rising portion. The results are also shown in Table 1.

[0063]

[Table 1]

[0064]

As described above, in the inner layer pipe of the present invention, the outer layer portion of the thermoplastic resin composition is laminated on the resin inner layer portion, and the protrusion formed integrally with the outer layer portion is formed on the outer layer portion. Since it is linearly provided along the longitudinal direction, the insertion tube can be smoothly inserted into the sheath tube by the protrusion. Moreover, since the insertion tube inserted in the sheath tube suppresses the vibration in the sheath tube due to the ridges provided in the outer layer portion even if the water hammer phenomenon occurs, The generation of impact noise due to a collision is reliably suppressed.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an example of an embodiment of an insertion tube of the present invention.

FIG. 2 is a cross-sectional view showing another example of the embodiment of the insertion tube of the present invention.

FIG. 3 (a) is a sectional view showing another example of the embodiment of the insertion tube of the present invention, and FIG. 3 (b) is a perspective view thereof.

FIG. 4 is a cross-sectional view of the insertion tube showing a state in which a coating layer made of a thermoplastic resin containing a lubricant is formed on the surface of the ridge.

FIG. 5 is a cross-sectional view of an insertion tube showing a state in which a coating layer made of a thermoplastic resin containing a lubricant is formed on the surfaces of the ridge and the outer layer.

FIG. 6 is a perspective view showing a use state of the insertion tube of the present invention in which the inner layer portion and the outer layer portion can be separated from each other.

FIG. 7 is a schematic view showing a method of manufacturing the endotracheal tube.

FIG. 8 is a schematic view of a sheath tube used for a penetration test of an insertion tube.

[Explanation of symbols]

 10 Internal Insertion Tube 11 Inner Layer Section 12 Outer Layer Section 13 Protrusions 14, 15 Coating Layer

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[Procedure amendment]

[Submission date] December 13, 1996

[Procedure amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] 0029

[Correction method] Change

[Correction contents]

Outer layer portion 12 integrally formed with each protrusion 13.
Is a thermoplastic resin composition having a hardness Shore A of 95 or less. Examples of the thermoplastic resin composition, a polymer material having an intermediate property between the plastic and rubber, thermoplastic elastomer is typically
Olefins such as polyethylene-polypropylene-ethylene propylene rubber (EPDM), styrene (TPS) typified by polystyrene-polybutadiene teleblock copolymer, urethane (TPU), ester (T
PEE) type, polyamide type, natural rubber type and the like. Further, not limited to such thermoplastic elastomer, soft polyvinyl chloride, ethylene-vinyl acetate copolymer (EV
A) etc. may be used.

Claims (9)

[Claims] 1. An inner tube that is inserted into a pre-piped sheath tube to be piped in the sheath tube, wherein the inner layer portion is made of resin and has a cylindrical shape, and the outer peripheral surface of the inner layer portion is covered. And an outer layer portion formed of a thermoplastic resin composition having elasticity, and an outer layer portion that protrudes outward from the outer peripheral surface of the outer layer portion to form a linear shape along the longitudinal direction of the outer layer portion. An intubation tube comprising: a ridge integrally formed with the ridge. 2. The intubation tube according to claim 1, wherein the thermoplastic resin composition has a hardness Shore A of 95 or less. 3. The insertion tube according to claim 1, wherein an interface between the inner layer portion and the outer layer portion is in a peelable state. 4. The insertion tube according to claim 1, wherein the ridge is linear along the axial direction of the outer layer portion. 5. The insertion tube according to claim 1, wherein the ridge has a spiral shape. 6. The intubation tube according to claim 1, wherein the thermoplastic resin composition is selected from a thermoplastic elastomer, a soft polyvinyl chloride, and an ethylene-vinyl acetate copolymer. 7. The insertion tube according to claim 1, wherein a coating layer made of a thermoplastic resin containing a lubricant is formed on the surface of the ridge. 8. The insertion tube according to claim 1, wherein the ridge is made of a thermoplastic resin containing a lubricant. 9. The insertion tube according to claim 1, wherein a coating layer made of a thermoplastic resin containing a lubricant is formed on the surfaces of the protrusion and the outer layer portion.