JP2009047256A - Cylindrical heat insulating material, pipe with heat insulating material, manufacturing method of cylindrical heat insulating material, and manufacturing method for pipe with heat insulating material - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enhance the heat insulation performance by a heat insulating material without degrading the productivity. <P>SOLUTION: A pipe 10 with a heat insulating material is covered by a first foam material 14, a second foam material 16 and a third foam material 18 which are laminated on an outer circumferential surface 12A of a resin-made pipe 12. The thickness of the covering layer is the total value of the thickness of three layers, i.e., the first foam material 14, the second foam material 16 and the third foam material 18 (the entire (total) layer thickness is increased). On the other hand, the layer thickness of each of the first foam material 14, the second foam material 16 and the third foam material 18 can be decreased (not thick), and the repulsive force of each of the first foam material 14, the second foam material 16 and the third foam material 18 can be decreased (not large). Thus, the joining strength of ends 14A, 16A, 18A of the first foam material 14, the second foam material 16 and the third foam material 18 need not be increased, and the heat insulation performance is enhanced without degrading the productivity. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a cylindrical heat insulating material, a pipe with a heat insulating material, a method for manufacturing a cylindrical heat insulating material, and a method for manufacturing a pipe with a heat insulating material.

  In recent years, resin pipes made of polybutene or the like have been widely used as pipes for water supply and hot water supply. When a resin pipe is used for water supply or hot water supply, the resin pipe is covered with a foamed material (heat insulating material) made of polyethylene or the like for heat insulation and insulation particularly in cold regions (see, for example, Patent Document 1).

As a method of manufacturing a pipe with a heat insulating material in which the periphery of the resin pipe is covered with a foam material (heat insulating material), the resin pipe is covered while the sheet-like foam material is squeezed into a circle, and the end of the sheet is heat-sealed. Thus, a method of continuously producing a pipe with a heat insulating material is known (see, for example, Patent Document 2).
JP 2000-97932 A JP 2005-125760 A

  For example, for the purpose of improving the heat retaining performance, when the foam material is thickened, the repulsive force (force to return from the state bent into the cylindrical shape to the original flat state) increases. For this reason, a fusion crack (joining failure) may occur in the heat-sealed portion (joint portion between the end portions) of the foam material.

Therefore, it is necessary to reduce the repulsive force by inserting a slit in the longitudinal direction of the foam material. However, it is necessary to insert the slit on the inner surface side (surface on the pipe side) of the foam material so that the appearance does not deteriorate. For this reason, the effect of reducing the repulsive force is not sufficient.
Therefore, although it is necessary to reduce the production rate and improve the fusion strength (bonding strength), the reduction in the production rate is a reduction in productivity.

  The present invention has been made to solve the above problem, and it is intended to prevent or suppress the bonding failure between the end portions of the belt-shaped heat insulating material and improve the heat retaining performance without reducing the productivity. is there.

  The manufacturing method of the cylindrical heat insulating member according to claim 1, the belt-shaped heat insulating material is transferred in the longitudinal direction, the heat insulating material is deformed in the width direction, and end portions in the width direction of the heat insulating material are joined to each other. The process of making a cylinder is successively performed on a plurality of strip-shaped heat insulating materials in order, and in the second and subsequent processes, the outside of the heat insulating material that has been formed into a cylindrical shape in the previous step is covered with a heat insulating material. It is a feature.

  In the manufacturing method of the cylindrical heat insulating member according to claim 1, the heat insulating material is deformed in the width direction and the end portions in the width direction of the heat insulating material are joined to each other while the belt-shaped heat insulating material is transferred in the longitudinal direction. The steps are continuously performed on a plurality of belt-shaped heat insulating materials in order, and in the second and subsequent steps, the outer side of the heat insulating material that has been cylindrical in the previous step is covered with the heat insulating material.

Therefore, a cylindrical heat insulating member in which a plurality of heat insulating materials are stacked (stacked structure) is manufactured. Therefore, the layer thickness of the whole heat insulating material (total) is increased.
On the other hand, since the layer thickness of each heat insulating material itself can be reduced (because it does not become thick), the repulsive force of each heat insulating material can be reduced (the repulsive force is large even if the layer thickness of the entire laminated heat insulating material is increased). Must not). Therefore, it is not necessary to increase the bonding strength between the end portions in the width direction of each heat insulating material. That is, since the bonding strength between the end portions of each heat insulating material is increased, there is no need to reduce the production rate.

Therefore, for example, compared to a method of increasing the heat insulation performance by increasing the layer thickness of the heat insulating material in a single layer structure, bonding failure between the end portions of the belt-shaped heat insulating material is prevented or suppressed, and as a result, productivity is increased. The heat retention performance is improved without lowering.
In addition, when an air layer is formed between each heat insulating material (interlayer), this air layer also has a heat insulation effect. Therefore, the heat insulation performance is improved as compared with the method of increasing the heat insulation performance by increasing the layer thickness of the heat insulation material.

  The manufacturing method of the cylindrical member according to claim 2 is characterized in that in the manufacturing method according to claim 1, the end portions of the heat insulating material are joined to each other by heat fusion.

  In the manufacturing method of the cylindrical member of Claim 2, since the edge parts of the width direction of a heat insulating material are joined by heat sealing | fusion, a joining process is easy compared with joining by an adhesive agent, for example. Therefore, productivity is further improved.

  The manufacturing method of the pipe with a heat insulating material according to claim 3, the belt-shaped heat insulating material and the pipe are transported in the longitudinal direction, the heat insulating material is deformed in the width direction, and the end portions in the width direction of the heat insulating material are connected to each other. The step of joining and forming a cylindrical shape is sequentially performed on a plurality of belt-shaped heat insulating materials, and in the first step, the outer peripheral surface of the pipe is covered with the cylindrical heat insulating material, The second and subsequent processes are characterized in that the heat insulating material covers the outside of the heat insulating material that has been cylindrical in the previous process.

  In the method for manufacturing a pipe with a heat insulating material according to claim 3, the heat insulating material is deformed in the width direction and the end portions in the width direction of the heat insulating material are joined to each other while transferring the belt-shaped heat insulating material and the pipe in the longitudinal direction. In the first step, the outer peripheral surface of the pipe is covered with a cylindrical heat insulating material, and the second and subsequent steps. In the step, the outside of the heat insulating material that has been cylindrical in the previous step is covered with the heat insulating material.

Therefore, a pipe with a heat insulating material is manufactured in which the outer peripheral surface of the pipe is covered with a plurality of heat insulating materials stacked. Therefore, the layer thickness of the whole heat insulating material (total) covering the outer peripheral surface of the pipe is increased.
On the other hand, since the layer thickness of each heat insulating material itself can be reduced (because it does not become thick), the repulsive force of each heat insulating material can be reduced (the repulsive force is large even if the layer thickness of the entire laminated heat insulating material is increased). Must not). Therefore, it is not necessary to increase the bonding strength between the end portions in the width direction of each heat insulating material. That is, since the bonding strength between the end portions of each heat insulating material is increased, there is no need to reduce the production rate.

Therefore, for example, compared to a method of increasing the heat insulation performance by increasing the layer thickness of the heat insulating material in a single layer structure, bonding failure between the end portions of the belt-shaped heat insulating material is prevented or suppressed, and as a result, productivity is increased. The heat retention performance is improved without lowering.
In addition, when an air layer is formed between each heat insulating material (interlayer), this air layer also has a heat insulation effect. Therefore, the heat insulation performance is improved as compared with the method of increasing the heat insulation performance by increasing the layer thickness of the heat insulation material.

  The manufacturing method of the pipe according to claim 4 is the manufacturing method according to claim 3, wherein the end portions of the heat insulating material are joined to each other by heat fusion.

  In the pipe manufacturing method according to the fourth aspect, since the end portions in the width direction of the heat insulating material are joined by heat fusion, for example, the joining process is easier than joining by an adhesive. Therefore, productivity is further improved.

  The cylindrical heat insulating material according to claim 5 is characterized in that end portions in the width direction of a plurality of laminated heat insulating materials in a strip shape are joined to form a cylindrical shape.

In the cylindrical heat insulating material according to claim 5, the end portions in the width direction of the plurality of laminated heat insulating materials in a strip shape are joined to form a cylindrical shape. Therefore, the layer thickness of the whole heat insulating material (total) is increased.
On the other hand, since the layer thickness of each heat insulating material itself can be reduced (because it does not become thick), the repulsive force of each heat insulating material can be reduced (the repulsive force is large even if the layer thickness of the entire laminated heat insulating material is increased). Must not). Therefore, it is not necessary to increase the bonding strength between the end portions in the width direction of each heat insulating material. That is, it is not necessary to lengthen the joining time in order to increase the joining strength between the end portions of each heat insulating material. That is, there is no need to reduce the production rate.

Therefore, for example, compared to a method of increasing the heat insulation performance by increasing the layer thickness of the heat insulating material in a single layer structure, bonding failure between the end portions of the belt-shaped heat insulating material is prevented or suppressed, and as a result, productivity is increased. The heat retention performance is improved without lowering.
In addition, when the air layer between each heat insulating material (interlayer) is formed, this air layer also has a heat insulation effect. Therefore, the heat insulation performance is improved as compared with the method of increasing the heat insulation performance by increasing the layer thickness of the heat insulation material.

  The pipe with a heat insulating material according to claim 6 is covered with a plurality of belt-shaped heat insulating materials on which the outer peripheral surfaces of the pipes are laminated, and the end portions in the width direction of the heat insulating material constituting each layer are joined. It is a feature.

In the pipe with a heat insulating material according to claim 6, the outer peripheral surface of the pipe is covered with a plurality of belt-shaped heat insulating materials stacked. Therefore, the layer thickness of the whole heat insulating material (total) covering the outer peripheral surface of the pipe is increased.
On the other hand, since the layer thickness of each heat insulating material itself can be reduced (because it does not become thick), the repulsive force of each heat insulating material can be reduced (the repulsive force is large even if the layer thickness of the entire laminated heat insulating material is increased). Must not). Therefore, it is not necessary to increase the bonding strength between the end portions in the width direction of each heat insulating material. That is, it is not necessary to lengthen the joining time in order to increase the joining strength between the end portions of each heat insulating material. That is, there is no need to reduce the production rate.

Therefore, for example, compared to a method of increasing the heat insulation performance by increasing the layer thickness of the heat insulating material in a single layer structure, bonding failure between the end portions of the belt-shaped heat insulating material is prevented or suppressed, and as a result, productivity is increased. The heat retention performance is improved without lowering.
In addition, when an air layer is formed between each heat insulating material (interlayer), this air layer also has a heat insulation effect. Therefore, the heat insulation performance is improved as compared with the method of increasing the heat insulation performance by increasing the layer thickness of the heat insulation material.

  As described above, according to the present invention, it is possible to prevent or suppress the bonding failure between the end portions of the belt-shaped heat insulating material, and to improve the heat retaining performance without reducing the productivity. Have.

Hereinafter, an example of an embodiment of a pipe with a heat insulating material in the present invention will be described in detail with reference to FIGS. 1 to 5.
First, the pipe 10 with a heat insulating material will be described.
As shown in FIG. 1 and FIG. 2, the pipe 10 with a heat insulating material is formed by laminating a first foam material 14, a second foam material 16, and a third foam material 18 on the outer peripheral surface 12 </ b> A of the resin pipe 12. It is set as the structure covered.

  The first foam material 14, the second foam material 16, and the third foam material 18 are formed in a strip shape, and end portions 14 </ b> A, 16 </ b> A, 18 in the width direction are joined to each other, and are formed in a cylindrical shape covering the outer peripheral surface 12 </ b> A of the pipe 12. (See also FIG. 5). In the present embodiment, the end portions 14A, 16A, and 18 of the first foam material 14, the second foam material 16, and the third foam material 18 are joined by thermal fusion.

Further, in the present embodiment, the pipe 12 is a φ15 borib den pipe made of boribten resin. Further, the first foam material 14, the second foam material 16, and the third foam material 18 are formed into a polyethylene sheet having a thickness of 5 mm by forming a polyethylene film on the surface. In addition, the 1st foam material 14, the 2nd foam material 16, and the 3rd foam material 18 are not limited to this. For example, a resin foam material (foamed sheet) represented by polypropylene, polystyrene, phenol, polyurethane, or the like may be used.
Further, the first foam material 14, the second foam material 16, and the third foam material 18 may be made of different materials and may have different thicknesses.

Next, a schematic configuration and manufacturing process of the manufacturing line 100 for manufacturing the pipe 10 with the heat insulating material shown in FIG. 1 will be described with reference to FIG.
As shown in FIG. 3, a pipe mounting portion 102 to which a resin pipe 12 wound in a coil shape is mounted is provided at the most upstream portion of the production line 100. Then, the pipe 12 is sent out from the pipe mounting portion 102 to the downstream side.

  A first guide portion 150 </ b> A is provided on the downstream side of the pipe mounting portion 102. The first guide portion 150A is composed of a pair of rollers 152A and 154A whose rotation axes are horizontal and a pair of rollers 153A and 155A whose rotation axes are vertical. These roller pairs 152A, 153A, 154A and 155A It is sandwiched between and guided and transferred downstream. By being guided and transported to the downstream side in this way, the resin pipe 12 is sent to the downstream side in a straight shape (in a state of being substantially straight in the longitudinal direction).

  A first coating device 200A that covers the outer peripheral surface 12A of the pipe 12 with the strip-shaped first foam material 14 is provided on the downstream side of the first guide portion 150A. In the first coating apparatus 200A, as shown in the left and right views of FIG. 5A, the first foam material 14 is moved while the pipe 12 and the strip-shaped first foam material 14 are transported in the longitudinal direction. The pipe 12 is deformed in the width direction to cover the outer peripheral surface 12A of the pipe 12, and the end portions 14A in the width direction of the first foamed material 14 are joined together by heat fusion. The detailed structure of the first coating apparatus 200A, the second coating apparatus 200B described later, the third coating apparatus 200B, and the like will be described later.

  A second guide portion 150B is provided on the downstream side of the first coating apparatus 200A. Similarly to the first guide portion 150A, the second guide portion 150B is composed of roller pairs 152B and 154B whose rotation axes are horizontal and roller pairs 153B and 155B whose rotation axes are vertical. It is sandwiched between the pairs 152B, 153B, 154B, 155B and guided to the downstream side.

  A second coating device 200B is provided on the downstream side of the second guide portion 150B. In the second coating apparatus 200B, as shown in the left and right views of FIG. 5B, the pipe 12 having the outer peripheral surface 12A coated with the first foam material 14 is transferred in the longitudinal direction while The foam material 16 is deformed in the width direction into a cylindrical shape, covers the outer side of the first foam material 14 covering the outer peripheral surface 12A of the pipe 12, and the end portions 16A in the width direction of the second foam material 16 are heat-sealed. Join with.

  A third guide portion 150C is provided on the downstream side of the second coating apparatus 200B. Similarly to the first guide portion 150A, the third guide portion 150C is composed of roller pairs 152C and 154C whose rotation axes are horizontal and roller pairs 153C and 155C whose rotation axes are vertical. It is sandwiched between the pairs 152C, 153C, 154C, and 155C and guided to the downstream side.

  A third coating device 200C is provided on the downstream side of the third guide portion 150C. In the third coating apparatus 200C, as shown in the left and right diagrams of FIG. 5B, while the pipe 12 coated with the first foam material 14 and the second foam material 16 is transported in the longitudinal direction. The third foam material 18 is deformed in the width direction to form a cylinder, covers the outer side of the second foam material 16, and the end portions 18A of the third foam material 18 in the width direction are joined together by heat fusion.

In this way, the pipe 10 with a heat insulating material having a three-layer structure in which the outer peripheral surface of the pipe 12 is covered with the laminated first foam material 14, second foam material 16, and third foam material 18 is manufactured.
Further, a take-up device 160 is provided on the downstream side of the third coating device 200C. The pipe 10 with a heat insulating material is manufactured while being drawn by the take-up device 160 (the pipe 12 is sandwiched and pulled between the conveying belts 162 and 164 of the take-up device 160 and sent out downstream).

  A cutting device 170 is provided on the downstream side of the take-up device 160, and a winding device 174 is provided on the downstream side of the cutting device 170, that is, the most downstream portion of the production line 100. The winder 174 winds up the pipe 10 with the heat insulating material in a coil shape, and the cutting device 170 cuts the pipe 10 with the heat insulating material at a predetermined length.

  On the other hand, the strip-shaped first foam material 14 wound in a coil shape is mounted on the first foam material mounting portion 110. Then, the first foam material 14 is strung over the plurality of transport rollers 112 to 119 and is transported to the first coating apparatus 200A described above. Similarly, the strip-shaped second foam material 16 wound in a coil shape is mounted on the second foam material mounting portion 120, and the strip-shaped third foam material 18 wound in a coil shape is the third foam material mounting portion. 130. And the 2nd foaming material 16 is wound around the some conveyance rollers 122-129, and is conveyed by the 2nd coating | coated apparatus 200B mentioned above. Similarly, the third foam material 18 is wound around the plurality of transport rollers 132 to 139 and transported to the above-described third coating apparatus 200C.

Next, the coating of the foam material 14 on the pipe 12 in the first coating apparatus 200A will be described with reference to FIG. FIG. 4B is a cross-sectional view taken along the line BB in FIG.
As shown in FIG. 4 (A), the foam material 14 is successively squeezed into a circular cylindrical shape while following the outer peripheral surface 12A of the pipe 12 (see also FIG. 4 (B)). Then, the hot air N is blown and heated to the end portion 14A in the width direction of the foam material 14 immediately before the drawing is completed, and the end portions 14A are brought into contact with each other and heat-sealed (joined). As a result, the foam material 14 is coated on the outer peripheral surface 12 </ b> A of the pipe 12. And after the foam material 14 is coat | covered, while letting both pass in the cylindrical die | dye 304 and adjusting the external shape of the foam material 14 (refer also the right figure of FIG. 5 (A)).

  It should be noted that the coating with the second foam material 16 and the third foam material 18 in the second coating device 200B and the third coating device 200C also includes the pipe 12, the first foam material 14 and the first foam material 14 respectively. Since only the pipe 12 covered with the foam material 14 and the second foam material 16 is replaced, the description is omitted.

  Moreover, you may perform the method of heat-seal | fusion by methods other than the blowing of the hot air N by the hot air apparatus 202. FIG. For example, an electric heating iron may be used, or both the hot air device 202 and the electric heating iron may be used.

Next, the operation of this embodiment will be described.
As shown in FIGS. 1 and 2, the pipe 10 with a heat insulating material is covered with a first foam material 14, a second foam material 16, and a third foam material 18 in which the outer peripheral surface 12 </ b> A of the resin pipe 12 is laminated. It is set as the structure (it is set as the pipe 10 with the heat insulating material of the three-layer structure on which the 1st foam material 14, the 2nd foam material 16, and the 3rd foam material 18 were laminated | stacked). Therefore, it becomes the layer thickness for the three layers of the first foam material 14, the second foam material 16, and the third foam material 18 (the total (total) layer thickness is increased).

  On the other hand, since the single layer thickness of each of the first foam material 14, the second foam material 16, and the third foam material 18 can be made thin (because it does not become thick), each first foam material 14, second foam material 16, third The repulsive force of the foam material 18 alone can be reduced (the repulsive force does not increase even if the layer thickness of the entire laminated heat insulating material is increased). Therefore, it is not necessary to increase the bonding strength between the end portions 14A, 16A, and 18A in the width direction of the first foam material 14, the second foam material 16, and the third foam material 18. That is, there is no need to reduce the production rate in order to increase the bonding strength. The repulsive force refers to the force that the belt-like first foam material 14, the second foam material 16, and the third foam material 18 try to return to the original flat state from the bent state. .

Further, it is not necessary to reduce the repulsive force by inserting a slit or the like. Therefore, there is no need for a slitting process (no production process for slitting is required).
Therefore, for example, the width direction of the first foam material 14, the second foam material 16, and the third foam material 18 is compared with the method of increasing the heat insulation performance by increasing the layer thickness of one foam material (single layer structure). Insulation failure between the end portions 14A, 16A, and 18A is prevented or suppressed, and as a result, the heat retention performance is improved without lowering the productivity.
Furthermore, since the end portions 14A, 16A, 18A in the width direction of the first foam material 14, the second foam material 16, and the third foam material 18 are joined together by thermal fusion, the joining process is easy. Therefore, productivity is further improved.

  An air layer is formed between the first foam material 14, the second foam material 16, and the third foam material 18 without completely bringing the first foam material 14, the second foam material 16, and the third foam material 18 into close contact. In this case, this air layer also has a heat insulating effect. Therefore, the heat retaining performance is improved as compared with the method of increasing the heat retaining performance by increasing the layer thickness of one foam material (single layer structure).

  Moreover, in the said embodiment, as shown in FIG. 2, the junction part of 14 A of end parts 14A, 16A, and 18A of the 1st foam material 14, the 2nd foam material 16, and the 3rd foam material 18 is substantially the same linear shape. Although located, it is not limited to this. As shown in FIG. 7, the joint portions between the end portions 14 </ b> A, 16 </ b> A, and 18 </ b> A of the first foam material 14, the second foam material 16, and the third foam material 18 may be shifted in the width direction.

Here, in the case of a single layer structure of a foam material having a thickness of 10 mm, since the repulsive force is large, there is a concern that fusion cracking may occur at the joint portion between the end portions even at a production rate of about 10 m / min. On the other hand, the bonding strength (fusion strength) may not be sufficient). On the other hand, in the case of a three-layer structure of the first foam material 14, the second foam material 16, and the third foam material 18 having a thickness of 5 mm, no fusion cracking occurs even if the production rate is about 20 m / min (repulsion). It has a sufficient bonding strength against the force).
In other words, if the conditions are the same, the three-layer structure of the foam material with a thickness of 5 mm (the total thickness is 15 mm and the heat retaining performance is better) than the single-layer structure of the foam material with a thickness of 10 mm is more productive. Is expensive.

Next, an example of an embodiment of the tubular heat insulating material 11 in the present invention will be described in detail with reference to FIG.
As shown in FIG. 6, the cylindrical heat insulating material 11 is configured such that the pipe 10 with the heat insulating material shown in FIG. 1 is not provided with the resin pipe 12. That is, the first foamed material 14, the second foamed material 16, and the third foamed material 18 as heat insulating materials are laminated, and the end portions 14A, 16A, 18 in the width direction are joined to each other to form a cylinder.

In addition, since it is the same as that of the pipe 10 with a heat insulating material except not providing the resin-made pipe 12, description is abbreviate | omitted.
Moreover, the manufacturing line and manufacturing process which manufactures the cylindrical heat insulating material 11 also laminate | stack the 1st foam material 14, the 2nd foam material 16, the 3rd foam material 18 in order, without transferring the pipe 12, It is manufactured by joining the end portions 14A, 16A, and 18 in the width direction to form a cylinder. That is, the outline structure and manufacturing process of the manufacturing line 100 for manufacturing the pipe 10 with the heat insulating material shown in FIGS. 3 and 4 are the same except that the pipe 12 is not transferred. Therefore, detailed description is omitted.
In addition, since the operation in the present embodiment is the same, the description thereof is omitted.

In addition, this invention is not limited to the said embodiment.
For example, in the embodiment described above, the first foam material 14, the second foam material 16, and the third foam material 18 have a three-layer structure in which the first foam material 14, the second foam material 16, and the third foam material 18 are laminated. A two-layer composition may be used, or a structure having four or more layers may be used.

  Further, for example, in the above-described embodiment, the end portions 14A, 16A, and 18A of the first foam material 14, the second foam material 16, the third foam material 18 and the foam material 14 are joined together by heat fusion, but this is limited to this. Not. Any joining method may be used. For example, you may join by an adhesive agent.

It is a perspective view which shows typically the pipe with a heat insulating material which concerns on embodiment of this invention. It is the enlarged view which expanded the junction part of the edge parts of the heat insulating material in the pipe with a heat insulating material shown in FIG. It is process drawing which shows typically the manufacturing process of the pipe with a heat insulating material which concerns on embodiment of this invention. (A) is explanatory drawing explaining a mode that a pipe | tube is covered with a 1st foaming material in a coating | coated apparatus, (B) is BB sectional drawing of (A). (A) shows from the left to the right how the outer peripheral surface of the pipe is coated with the first foam, and (B) shows from the left to the right how the second foam is coated on the outside of the first foam. (C) is explanatory drawing which shows a mode that a 3rd foaming material is coat | covered on the outer side of a 2nd foaming material from a left figure to a right figure. It is a perspective view which shows typically the cylindrical heat insulating material which concerns on embodiment of this invention. It is a figure which shows the example which the junction part of edge parts has shifted | deviated to the width direction.

Explanation of symbols

10 Pipe with heat insulating material 11 Tubular heat insulating material 12 Pipe 14 First foam material (heat insulating material)
16 Second foam material (heat insulation)
18 Third foam (heat insulation)
14A end 16A end 18A end

Claims (6)

While transferring the belt-shaped heat insulating material in the longitudinal direction, the step of deforming the heat insulating material in the width direction and joining the end portions in the width direction of the heat insulating material to form a cylinder, with respect to a plurality of belt-shaped heat insulating material In order,
In the second and subsequent steps, a method for manufacturing a cylindrical heat insulating material, characterized in that the heat insulating material that has been tubular in the previous step is covered with a heat insulating material.   The method for manufacturing a cylindrical heat insulating material according to claim 1, wherein the end portions of the heat insulating material are bonded to each other by heat fusion. The process of deforming the heat insulating material in the width direction and joining the end portions in the width direction of the heat insulating material into a tubular shape while transporting the belt-shaped heat insulating material and the pipe in the longitudinal direction is a plurality of belt-shaped heat insulating materials. To the material in order,
In the first step, the pipe-shaped heat insulating material covers the outer peripheral surface of the pipe,
In the second and subsequent steps, a method for manufacturing a pipe with a heat insulating material, characterized in that the heat insulating material that has been cylindrical in the previous step is covered with a heat insulating material.   The method for manufacturing a pipe with a heat insulating material according to claim 3, wherein the end portions of the heat insulating material are joined to each other by heat fusion.   A cylindrical heat insulating material characterized in that end portions in the width direction of a plurality of laminated heat insulating materials are joined to form a cylindrical shape.   A pipe with a heat insulating material, wherein a plurality of belt-shaped heat insulating materials on which outer peripheral surfaces of the pipe are laminated are covered and ends in the width direction of the heat insulating materials constituting each layer are joined.

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