JP2008281122A - Heat insulation hose made of synthetic resin, and its manufacturing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a heat insulation hose made of a synthetic resin having excellent bendability and shape keeping capability, capable of effectively exerting a heat insulating action, and having a structure suitable for mass production. <P>SOLUTION: This heat insulation hose made of a synthetic resin is structured such that a cross-sectionally-circular hollow wire 2 made of a rigid synthetic resin is spirally wound on an inner pipe 1 made of a flexible synthetic resin; an outer pipe 3 made of a flexible synthetic resin is arranged on the hollow wire 2; heat insulating materials 4 and 5 are filled in a spiral space part surrounded by the inner and outer pipes 1 and 3 and the hollow wire 2, and in the hollow wire 2; and excellent bendability is exerted by bending, into a projecting circular shape toward the outside, each pipe wall part 3a of the outer pipe 3 between top parts of the hollow wire part adjacent to each other by the filling pressure. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a synthetic resin heat insulating hose having pressure resistance and flexibility and a method for manufacturing the same.

As a heat-insulating hose, for example, as described in Patent Document 1, conventionally, a hollow spiral ridge made of a soft vinyl chloride resin in which a core material is provided on the outer peripheral surface of an inner tube made of a soft vinyl chloride resin. A cord-shaped heat insulating material made of foamed polyethylene resin is spirally wound around the outer peripheral surface of the inner tube so as to cover the hollow spiral ridge through a partition wall made of the same material as the inner tube. And a heat insulating layer having a constant thickness is formed, and the outer surface of the heat insulating layer is covered with a soft synthetic resin outer tube made of the same material as the inner tube. As shown in the figure, a hard synthetic resin hose main body having flexibility is formed by projecting a large number of V-shaped annular ridges on the outer periphery at predetermined intervals in the length direction. Cylindrical foamed synthetic resin on the outer surface of the main hose Ones formed by coating with the heat insulating material structure are widely known.
JP-A-10-103586 Japanese Patent No. 3371243

  However, according to the former heat insulating hose, the hollow spiral ridge with the core material formed on the outer peripheral surface of the inner pipe is covered with a heat insulation layer that is thicker than the thickness of the hollow spiral ridge of the hollow wire rod. Therefore, the outer diameter of the hose is larger than necessary and the material cost increases compared to the effective diameter of the inner pipe through which fluid etc. circulates. In the outer peripheral wall portion that curves in the longitudinal direction, a tensile force is generated in the length direction, and in the inner peripheral wall portion that curves in a concave arc shape, a compressive force is generated in the length direction. At the inner peripheral wall where the plastic outer tube is tensioned against the tensile force and compressive force acts, it is difficult for the thick heat insulation layer to exert a relatively large resistance force in the compression direction and to bend greatly There was a problem of becoming.

  On the other hand, according to the latter heat insulating hose, the hose main body has a large number of annular ridges protruding in the length direction at predetermined intervals on the outer periphery thereof. Although it has good curvature and pressure resistance, it has a structure in which the base end of an annular ridge having a V-shaped cross section is opened from the inner peripheral surface of the hose body toward the center, so that smooth drainage etc. There is a problem that hinders distribution. In addition, the hose body itself does not have a heat insulating function, but it is configured to exert a heat insulating effect by covering the outer peripheral surface of the hose body with a cylindrical foam synthetic resin heat insulating material separately manufactured. In addition, there is a problem that it takes time for manufacturing and is not suitable for mass production.

  Further, when the hose main body is curved, the outer peripheral surface curved in a convex arc shape tends to increase the interval between the tops of adjacent annular ridges, while the inner peripheral surface curved in a concave arc shape The gap between the tops of adjacent annular ridges tends to be narrowed, but the inner layer part of the foamed synthetic resin insulation material bites in between the arc-shaped ridges, so the annular ridges on the outer peripheral surface The heat insulating hose described in the above-mentioned Patent Document 1 resists to prevent the space between the tops of the ring from expanding, and resists to prevent the space between the tops of the annular ridges from narrowing on the inner peripheral surface. Similarly to the above, there is a problem that smooth curving is hindered.

  The present invention has been made in view of such problems, and the object of the present invention is to provide a good bendability and shape retaining property and an excellent pressure resistance and to effectively exhibit a heat insulating effect. A synthetic resin heat insulating hose suitable for use as a protective tube or sheath tube for conducting drainage hoses and other pipes, and a method for easily and inexpensively manufacturing this synthetic resin hose There is.

  In order to achieve the above object, the synthetic resin heat insulating hose according to the present invention has a fiber heat insulating material or foam heat insulating material on the outer peripheral surface of the soft synthetic resin inner tube over the entire length, as described in claim 1. A hard synthetic resin hollow wire having a circular cross section filled with a material is wound spirally at a constant pitch, and the spiral wound hollow wire is covered with a soft synthetic resin outer tube to be hollow. The inner peripheral surface of the outer tube made of soft synthetic resin in contact with the top of the wire is integrally fused to the hollow wire, and further, the hollow wire adjacent to the inner and outer tubes made of the soft synthetic resin and the length of the hose The helical space part surrounded by the part is filled with the same heat insulating material as described above.

  In the heat insulating hose made of synthetic resin thus configured, the invention according to claim 2 is a tube wall between the inner peripheral surfaces of the outer tube made of soft synthetic resin fused to the top of the adjacent hollow reinforcing core wire part. The portion is curved in a convex arc shape toward the outside by the filling pressure of the heat insulating material. In addition, as the said heat insulating material, as described in Claim 3, the heat insulating material which consists of fibrous materials, such as rock wool and glass wool, or the foam heat insulating materials, such as a foamed plastic, is used.

  The invention according to claim 4 is the method for manufacturing the synthetic resin heat insulating hose, wherein the semi-molten soft synthetic resin strip is succeeded on one side of the preceding strip portion on the molding rotating shaft. An inner tube is formed by spirally winding the opposite side portions of the belt-shaped material portion to be welded together, and a semi-molten hard with a circular cross section on the outer peripheral surface of the inner tube A hollow wire made of synthetic resin is spirally wound at a predetermined pitch while being filled with a heat insulating material inside the hollow with compressed air, and is integrally welded to the outer peripheral surface of the inner tube. Further, a soft synthetic resin is formed on the hollow wire. An outer tube is formed by winding the band-shaped material in a spiral manner while overlapping the opposite side portions of the following band-shaped material portion on one side portion of the preceding band-shaped material portion and welding them together. On the inner surface of the synthetic resin strip and the hollow wire Helically space between between spiral winding part adjacent to the longitudinal direction of the hose by means of compressed air, characterized in that filling the insulation.

  According to the first aspect of the present invention, the hollow wire having a circular cross section spirally wound around the outer peripheral surface of the soft synthetic resin inner tube with a constant pitch is made of a hard synthetic resin. Resin hollow wire can give pressure resistance to hose whose inner and outer pipes are made of soft synthetic resin, and even if the hose is greatly bent, the curved part can be kept circular without deforming into a flat shape The hollow interior of the hollow wire having a circular cross section that is spirally interposed between the inner and outer pipes made of soft synthetic resin, and the inner and outer pipes made of soft synthetic resin that are partitioned by the spiral hollow wire Since the heat insulating material is filled in the spiral space between the surfaces, a good heat insulating effect can be exhibited over the entire length.

  Furthermore, since the thickness of the heat insulation layer is formed to be approximately equal to the diameter of the hollow wire spirally wound around the outer peripheral surface of the inner tube, the material cost can be reduced because it does not become more than necessary. Not only can the compression force in the radial direction of this heat-insulating hose be applied, but the hard synthetic resin hollow wire wound around the outer peripheral surface of the inner tube in a spiral manner can be directly compressed. It is possible to firmly prevent the heat insulating layer from being greatly compressed by receiving the heat and thus to maintain a uniform thickness and exhibit a predetermined heat insulating action.

  In addition, since the heat insulating material is made of a fibrous material such as rock wool or glass wool, or a foamed synthetic resin material, when the heat insulating hose is bent, the heat insulating material easily increases or decreases its filling density. Smooth bending can be allowed. In this case, according to the invention according to claim 2, the tube wall portion between the inner peripheral surfaces of the soft synthetic resin outer tube fused to the top of the adjacent hollow reinforcing core wire portion is formed by the filling pressure of the heat insulating material. Since it is curved in a convex arc shape toward the outside, when this heat insulating hose is curved, as described above, a tensile force acts in the length direction on the outer peripheral surface bent in a convex arc shape, A compressive force acts on the inner peripheral surface portion bent in a concave arc shape, but the outer peripheral surface portion is deformed in a direction in which the tube wall portion curved in the convex arc shape is tensioned, and the tensile force is applied. Absorbs and can absorb the compressive force by projecting the inner wall surface part while bending and deforming further outward, and therefore the cross-sectional circle without deforming the hose into a flat shape. Can be easily bent while maintaining its shape

  In addition, since the tube wall portion between adjacent hollow reinforcing core wire portions is curved outward in a convex arc shape by the filling pressure of the heat insulating material as described above, the hollow reinforcing core wire portion adjacent to the inner and outer tubes The volume of the spiral space portion surrounded by and can be further increased, and the heat insulating effect by the heat insulating material can be further improved.

  As a method for manufacturing such a synthetic resin hose, as described in claim 4, a semi-molten soft synthetic resin strip is placed on one side of the preceding strip portion on the rotating shaft. The opposite side of the following strip-shaped material part is overlapped and welded together to form an inner tube by spiral winding, and on the outer peripheral surface of the inner tube, on the outer peripheral surface of the inner tube A hollow wire made of a hard synthetic resin with a circular cross-section is spirally wound with a predetermined pitch while filling the hollow interior with a heat insulating material and welded integrally to the outer peripheral surface of the inner tube. A semi-molten hard synthetic resin hollow wire that is spirally wound around the tube is deformed into a flat shape by the winding force, and is reliably circular in cross section while being prevented by the filling pressure filled with compressed air. Can be wound in a held state It can be smoothly filled with the desired amount of insulation material together.

  Further, a soft synthetic resin belt-like material is wound on the hollow wire material in a spiral manner while overlapping the opposite side portions of the following belt-like material portion on one side portion of the preceding belt-like material portion and welding them together. As a result, the outer tube is formed, and a heat insulating material is applied to the spiral space portion between the inner surface of the synthetic resin belt-shaped material to be wound and the spiral winding portion adjacent to the length of the hose in the hollow wire by compressed air. Since it is filled, even when spirally winding a soft synthetic resin strip for forming the outer tube on the hollow wire made of the above-mentioned semi-molten hard synthetic resin spirally wound on the outer peripheral surface of the inner tube, The semi-molten hollow wire is deformed into a flat shape by the wrapping force of the soft synthetic resin strip, together with the filling pressure of the heat insulating material filled with compressed air inside the hollow wire, and the hose in the hollow wire Length direction It can be reliably prevented by the pressure of the adjacent heat-insulating material which is filled with compressed air in a spiral space between the spiral wound portion.

  Accordingly, the hollow reinforcing core wire is integrally cured with the inner and outer tubes between the outer peripheral surface of the inner tube made of the soft synthetic resin and the inner peripheral surface of the outer tube by curing the hollow wire while maintaining the circular cross section. A synthetic resin hose wound in a spiral shape can be easily manufactured, and a space portion having a constant thickness corresponding to the outer diameter of the hollow reinforcing core wire having a circular cross section is provided between the opposing surfaces of the inner and outer tubes. A heat insulating hose in which the space is filled with the heat insulating material substantially uniformly can be efficiently manufactured. In addition, it is possible to provide a heat insulating hose made of a synthetic resin that can exhibit an excellent pressure strength by a hollow reinforcing core wire made of a hard synthetic resin and has a good shape retaining property as a whole.

  Further, when the outer tube is formed by the soft synthetic resin strip on the hollow wire wound on the inner tube, as described above, the soft synthetic resin strip between the adjacent spirally wound portions of the hollow wire The material portion can be expanded by the filling pressure of the heat insulating material to form a convex arc-shaped tube wall portion, and this tube wall portion can exhibit excellent bendability and at the same time into the spiral space portion. It is possible to manufacture a synthetic resin heat insulating hose having an increased amount of heat insulating material and exhibiting a further excellent heat insulating action.

  Next, a specific embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a simplified side view of a part of a synthetic resin heat insulating hose A, and FIG. 2 is an enlarged sectional view of a part thereof. This synthetic resin heat insulating hose A has a soft synthetic resin inner pipe 1 whose inner peripheral surface is formed on a smooth surface of the same diameter over its entire length, and a predetermined pitch interval between the outer peripheral surface of the inner pipe 1. Thus, a hard synthetic resin hollow wire 2 having a circular cross section formed by spirally winding an inner peripheral wall portion that is in contact with the outer peripheral surface of the inner tube 1 and integrally fusing with the inner tube 1, and this spiral shape An outer pipe 3 made of a soft synthetic resin, in which an inner peripheral surface portion in contact with the top portion is welded to and integrated with the top portion of the wound hollow wire 2, and heat insulation that fills the hollow interior of the hollow wire 2 over the entire length. The length of the hose in the hollow wire 2 between the facing surfaces of the material 4 and the above-mentioned soft synthetic resin inner and outer tubes And a hollow wire portions 2a, 2a and the enclosed spiral space 6 heat insulating material 5 which is filled over the entire length adjacent to the direction.

  The thickness of the inner and outer pipes 1 and 3 made of soft synthetic resin and the thickness of the peripheral wall of the hollow wire 2 made of hard synthetic resin are formed to be 1 mm or less, and for example, the outer diameter is about 30 mm. In the case of a resin heat insulating hose, it is formed to have a thickness of 0.4 to 0.5 mm, and the gap between the opposing surfaces of the inner and outer tubes 1, 3, that is, the outer diameter of the small-diameter hollow wire 2 is approximately 4 mm. The hitch is approximately 9mm. Note that the hollow reinforcing core wire 2 is not necessarily formed in a perfect circular cross section, but may be formed in an elliptical cross section having a slightly longer major axis in the length direction of the hose.

  In order to obtain such a structure in which the thin hollow wire 2 is interposed in the gap between the inner tube 1 and the outer tube 3 while maintaining a circular shape in cross section, it is a hard composite in a semi-molten state at the time of manufacturing the hose. When the resin hollow wire 2 is spirally wound around the inner tube 1 made of a soft synthetic resin, a fibrous heat insulating material or a foam heat insulating material 4 is supplied into the hollow interior by compressed air and filled with the compressed air. The hollow wire 2 is held in a state where the hollow wire 2 is expanded in a circular shape with a predetermined diameter by pressure, and is wound spirally on the inner tube 1 in this state, and the hollow reinforcing core wire 2 is flattened by the winding force. It is made possible by curing in a state where it is prevented from being deformed by the filling pressure.

  Further, the spiral space portion 6 surrounded by the outer peripheral surface of the inner tube 1 and the inner peripheral surface of the outer tube 3 and the hollow wire portions 2a and 2a adjacent to the length direction of the hose is the spiral space portion. The outer wall 3 of the outer tube 3 forming the outer peripheral wall 6, that is, the tube wall portion 3 a between the tops of the adjacent hollow wire portions 2 a, 2 a is curved outwardly into a convex arc shape. Thus, the heat insulating material 5 is filled in the spiral space 6.

  Thus, in order to make the tube wall portion 3a of the outer tube 3 spanned between the hollow wire portions 2a, 2a adjacent in the length direction of the hose curved in a convex arc shape outward, At the time of manufacturing the hose, the hollow wire 2 is wound on the inner tube 1 in a spiral manner, followed by the hollow wire 2a wound in the spiral direction first in the hollow wire 2 and then wound in the spiral direction. When the outer tube 3 is formed by spirally winding a semi-molten soft synthetic resin strip over the top of the hollow wire portion 2a, the inner surface of the soft synthetic resin strip is adjacent to the adjacent portion. The hollow wire rod in the soft synthetic resin strip that is in a semi-molten state by supplying the fibrous heat insulating material or the foam heat insulating material 5 to the space 6 between the hollow wire rod portions 2a, 2a by compressed air and filling pressure by the compressed air The tube wall part 3a between the tops of the parts 2a and 2a faces outward Inflated in a convex arc shape Te, it can be carried out by curing at this state.

  In this outer tube 3, the tube wall portion 3 b whose inner surface is fused and integrated with the top of the hollow reinforcing core wire 2 is also curved in a convex arc shape along the curved top surface of the hollow reinforcing core wire 2. However, the inner surface of the hollow reinforcing core wire member 2a, 2a adjacent to the tube wall portion 3b in the hose length direction is welded to the top surface. The tube wall portion 3a curved in the shape of the convex arc, which is integrally attached, is formed to be wider and have a slightly higher protruding height outward.

  The inner tube 1 and the outer tube 3 are made of the same soft synthetic resin, for example, an olefin resin such as polyethylene, polypropylene, EVA resin, or a soft synthetic resin such as vinyl chloride resin. It is made of a synthetic resin harder than the soft synthetic resin forming the inner tube 1 and the outer tube 3, for example, a hard synthetic resin having appropriate elasticity and hardness, such as polyethylene, polypropylene, hard vinyl chloride, etc. The same kind of synthetic resin is used so that it can be fused and integrated with the soft synthetic resin forming the tubes 1 and 3.

  Moreover, as the heat insulating materials 4 and 5 filled in the hollow of the hollow wire 2 and the spiral space 6, the fibrous material having heat insulating properties such as rock wool and glass wool, or foamed plastic, etc. Uses foam insulation.

  Since the synthetic resin heat insulating hose A is configured in this manner, even if an external force is applied to the outer tube 3 to compress the heat insulating hose A in the radial direction, the outer tube 3 is spirally wound on the inner tube 1, and Since the hollow wire 2 in which the portion in contact with the inner surface of the outer tube 3 is integrally fused to the outer tube 3 is made of a hard synthetic resin, the heat insulating hose A is flat with a large resistance against the external force. In addition, the spiral space between the opposing surfaces of the spiral hollow wire 2 and the soft synthetic resin inner and outer tubes 1 and 3 partitioned by the spiral hollow wire 2 can be prevented. Since the heat insulating materials 4 and 5 are filled in the portion 6, the gap between the opposing surfaces of the inner and outer tubes 1 and 3 is entirely filled with the heat insulating materials 4 and 5, and a good heat insulating action is achieved over the entire length. be able to.

  In addition, even if an external force is partially applied to the outer peripheral surface of the heat insulating hose A, that is, the outer peripheral surface of the outer tube 3, the outer tube 3 is directly received by the hard hollow wire 2. Therefore, there is no fear of being greatly dented, and a substantially uniform heat insulating action can be achieved over the entire length.

  Further, when the heat insulating hose A is bent, a tensile force is generated in the length direction on the outer peripheral surface bent in a convex arc shape, and a compressive force is generated in the inner peripheral surface portion bent in a concave arc shape. However, as shown in FIG. 3, in the outer peripheral surface portion, the tube wall portion 3a curved in a convex arc shape in the outer tube 3 is deformed in a tensioning direction to absorb the tensile force, In the inner peripheral surface portion, the tube wall portion 3a can absorb and compress the compressive force while bending and deforming further outward, so that the heat insulating hose A can be easily bent to a predetermined curvature. At this time, the heat insulating materials 4 and 5 filled in the hollow wire 2 and the spiral space portion 6 change its filling density in accordance with the tensile force and the compressive force and greatly increase the curvature of the heat insulating hose A. There is no fear of resistance.

  Next, a method of manufacturing the synthetic resin heat insulating hose A will be described with reference to FIGS. 4 to 6. A soft synthetic resin strip 1 'such as a semi-molten soft vinyl chloride resin having a constant width and a constant thickness. As is well known, the opposite side portion of the following strip-shaped material portion is superimposed on one side portion of the preceding strip-shaped material portion on the base end portion of the molding rotating shaft 10 as is well known while being extruded from the molding nozzle 11 of the first extruder. The inner tube 1 is formed by spirally winding at a constant pitch while being integrally welded, and a semi-molten state is formed from the forming nozzle 12 of the second extruder while the inner tube 1 is being formed. On the inner tube 1 formed by the above-mentioned synthetic resin strip 1 'wound around the molding rotary shaft 10 while extruding a hollow wire 2' having a circular cross section made of hard synthetic resin such as hard vinyl chloride resin The hollow reinforcing core wire 2 'is placed at a constant pitch interval. By winding in a spiral manner, the inner peripheral surface thereof is integrally welded onto the synthetic resin strip 1 '.

  At this time, when the semi-molten hollow wire 2 ′ is extruded from the forming nozzle 12 of the second extruder, the heat insulating material is injected into the hollow of the hollow reinforcing core wire 2 ′ from the first heat insulating material supply nozzle 15 by a jet of compressed air. The heat insulating material 4 is filled in the hollow wire 2 ′ by pumping 4 and the hollow wire 2 ′ is wound around the inner tube 1 while being held in a hollow circular shape by this filling pressure. As described above, when the hollow wire 2 ′ in a semi-molten state is spirally wound around the inner tube 1 formed on the molding rotary shaft 10 while applying a filling pressure in the hollow wire 2 ′, the winding is performed. The hollow wire 2 ′ is prevented from being deformed into a flat shape by an applied force, and can be wound while being held in a circular cross-section, and is made of a synthetic resin that forms the inner tube 1. The hollow wire 2 fused integrally on the strip 1 'can be spirally provided.

  Subsequent to the step of spirally winding the hollow wire 2 'on the inner tube 1 formed on the molding rotating shaft 10, the synthesis is performed on the hollow wire 2' from the molding nozzle 13 of the third extruder. The above-described hollow wire rod obtained by extruding a soft synthetic resin strip 3 'in a semi-molten state having a certain width and thickness made of the same synthetic resin as the resin strip 1' and spirally winding the soft synthetic strip 3 ' The inner surface portion in contact with the top portion is welded and integrated with the top portion so as to be bridged between the top portions of the spiral wound core wire portions 2a, 2a adjacent to each other in the length direction of the hose of 2 ', and The outer tube 3 is formed by spirally winding at a constant pitch while superimposing the opposite side portions of the succeeding strip-shaped material portion on one side portion of the preceding strip-shaped material portion and welding them together. .

  At the time of forming the outer tube 3, the hollow wire 2 ′ before curing is pressed by the winding force of the soft synthetic resin strip-shaped material 3 ′ forming the outer tube 3. As described above, since the heat insulating material 4 is filled to hold the hollow wire 2 ', the hollow wire 2' can be prevented from being deformed into a flat shape by this filling pressure. Further, when this soft synthetic resin strip 3 'is spirally wound around the hollow wire 2', the inner surface of the soft synthetic resin strip 3 'and the adjacent hollow reinforcing core wire portions 2a, 2a The heat insulating material 5 is pumped by the jet of compressed air from the second heat insulating material supply nozzle 16 into the helical space portion 6 to be filled in the helical space portion 6 and the adjacent hollow wire portion is filled with the filling pressure. By expanding the band-shaped material portion between 2a and 2a outwardly in a convex arc shape and curing in this state, the tube wall portion 3a made of this band-shaped material portion is curved outwardly in a convex arc shape The outer tube 3 thus formed is formed.

  In this way, while continuously forming the synthetic resin heat insulating hose having the above-described structure in which the hollow wire 2 wound spirally between the inner and outer tubes 1 and 3 made of soft synthetic resin is interposed on the molding rotating shaft 10. The hose is moved toward the tip of the molding rotary shaft 10 and is cooled by cooling water sprayed from the pipe 17 provided with a large number of cooling water injection holes in the course of movement. The heat insulating hose A having a predetermined length is obtained by cutting it out at a desired length or every predetermined length.

The simplified side view which sectioned a part of synthetic resin hose. The expanded sectional view of the one part. The expanded sectional view of a part of the state bent. The simplified top view which shows a manufacturing method. The enlarged plan view of the principal part. Sectional drawing of the shaping | molding nozzle part of a 2nd extruder.

Explanation of symbols

1 Soft synthetic resin inner tube 2 Hard synthetic resin hollow wire 3 Soft synthetic resin outer tube
3a Tube wall part 4, 5 Heat insulation material 6 Spiral space

Claims (4)

  A hard synthetic resin hollow wire having a circular cross-section filled with a fibrous heat insulating material or a foam heat insulating material over its entire length is spirally wound around the outer peripheral surface of the soft synthetic resin inner tube at a constant pitch. The spirally wound hollow wire is covered with a soft synthetic resin outer tube, and the inner peripheral surface of the soft synthetic resin outer tube in contact with the top of the hollow wire is integrally fused to the hollow wire. Furthermore, the same heat insulating material as described above is filled in a spiral space surrounded by the inner and outer tubes made of the soft synthetic resin and the hollow wire portion adjacent in the length direction of the hose. Synthetic resin insulation hose.   The tube wall portion between the inner peripheral surfaces of the outer tube made of soft synthetic resin fused to the top of the adjacent hollow reinforcing core wire portion is curved in a convex arc shape toward the outside by the filling pressure of the heat insulating material. The heat insulating hose made of synthetic resin according to claim 1.   The synthetic resin heat insulating hose according to claim 1 or 2, wherein the heat insulating material is a fibrous heat insulating material such as rock wool or glass wool, or a foamed heat insulating material such as foamed plastic.   A semi-molten soft synthetic resin strip is wound on the mold rotation shaft in a spiral manner with the opposite sides of the subsequent strip overlapped on one side of the preceding strip and welded together. The inner tube is formed by turning, and a semi-molten hard synthetic resin hollow wire having a circular cross section is formed on the outer peripheral surface of the inner tube while a heat insulating material is filled in the hollow interior with compressed air. The belt-shaped material portion that is spirally wound at the pitch of the inner tube and is integrally welded to the outer peripheral surface of the inner tube, and further, the belt-shaped material portion made of a soft synthetic resin on the hollow wire material is followed by one side portion of the preceding belt-shaped material portion. The outer tube is formed by spirally winding the opposite side portions of each other while being integrally welded, and adjacent to the inner surface of the synthetic resin belt-like material to be wound and the length direction of the hose in the hollow wire Compressed air in the spiral space between the spiral winding part Method for producing a synthetic resin insulation hose, characterized by filling a heat insulating material by.

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