JP2009204109A - Cover material thermal fusion tool and cover material thermal fusion method using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cover material thermal fusion tool easy to construct in a narrow site and having high bonding strength to a coat material while suppressing a heat loss to prevent an occurrence of dew condensation, and also to provide a cover material thermal fusion method using the same. <P>SOLUTION: The thermal fusion tool 10 is provided for thermal fusion and bonding between the ends of the cover material 12 to cover a pipe 11. The sheet-like heat fusion tool 10 comprises: a thermally fusible sheet-like substrate 13 annularly formed according to the cover material 12; and an electric heating member 15 provided thereon with a hole portion 14. The heating member 15 is energized in the state of being laid between the ends of the cover material 12 to melt the sheet-like substrate 13 and the ends of the cover materials 12. Thereby, a part between the ends of the cover material 12 is thermally fused via the hole portion 14 of the heating member 15. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a thermal fusion tool for a coating material for joining a coating material such as a heat insulating material for coating a pipe by thermal fusion, and a thermal fusion method for the coating material using the same.

  Generally, a heat insulating tube is configured by covering a pipe such as a copper tube with a heat insulating material. However, in order to improve the heat insulating property, it is preferable to eliminate the connecting portion as long as possible. However, the length of the heat insulation tube is usually set to about 4 m from the viewpoints of transportation problems and building construction problems. For this reason, in order to use a heat insulation pipe | tube at a construction site, it is necessary to connect piping, and the connection of such piping is normally performed by welding. In this case, the heat insulating material located at the welded portion is shifted from the position, or the heat insulating material called the back split is cut in the axial direction to remove the heat insulating material. Thereafter, the end portions of the heat insulating material are butted together, and an adhesive tape is wound around the outer periphery of the butted portion, or the heat insulating tube is covered and the end portions of the heat insulating material are joined.

Specifically, the following is known as a connection structure of this type of heat insulation double tube (see, for example, Patent Document 1). That is, the connection structure comprises a pipe body made of high-density polyethylene, a heat insulating material for heat insulation covering the pipe body, and an outer pipe on the outer periphery thereof, and a joint with heating wire fitted to the tip portion of the pipe body The heat insulating material covering the vicinity, the tubular cover covering the heat insulating material, and the heat shrinkable tube covering the joint between the tubular cover and the outer tube. After fitting a heating wire-containing joint (electrofusion joint) to each tip of the tube, power is supplied to the heating wire, and the inner surface of the joint and the outer surface of the tube are heated, melted, and joined. The pipes are connected. Next, the outer periphery of the joint is covered with a heat insulating material, and the tubular cover covering the heat insulating material and the outer tube covering the heat insulating material on the outer periphery of the tube are covered with a heat shrinkable tube, and the heat shrinkable tube is heated. It is configured to shrink and seal the seam.
Japanese Patent Laid-Open No. 10-238677 (page 2, page 4 and page 6)

  However, in the connection structure of the heat insulation double pipe described in Patent Document 1, the heat insulation for heat insulation is covered on the outer periphery of the joint, and the upper cover is covered with a tubular cover, and the joint between the tubular cover and the outer pipe is provided. A heat shrink tube must be placed. Therefore, there is a problem that the construction is difficult when the construction site where the heat insulation double pipe is connected is very narrow. In addition, the joint between the tubular cover and the outer tube is joined by a heat-shrinkable tube, and the heat insulation for heat insulation itself is not directly joined. Therefore, the joint strength between the heat insulation for heat insulation is low, and heat loss occurs between the heat insulation for heat insulation. There was also a risk of condensation.

  The present invention has been made paying attention to such problems existing in the prior art, and the object of the present invention is that the construction is easy even in a narrow place, the bonding strength between the covering materials is high, and the heat is further reduced. An object of the present invention is to provide a heat-sealing tool for a covering material that can suppress loss and prevent the occurrence of condensation, and a method for heat-sealing a covering material using the same.

  In order to achieve the above-mentioned object, the heat-sealing device for a covering material according to the invention described in claim 1 is characterized in that the covering material is bonded to the ends of the covering material covering the pipe by heat-sealing. A heating member for electric heating having a hole is provided on a heat-fusible sheet-like substrate formed in an annular shape so as to correspond to the above. Then, the heating member is energized in a state of being interposed between the end portions of the covering material, the end portions of the sheet-like base material and the covering material are melted, and the end portions of the covering material are thermally melted through the holes of the heating member. It is configured to be worn.

According to a second aspect of the present invention, in the invention, the heat-fusible sheet-like base material has a communication hole communicating with the hole of the heating member. .
In the invention according to claim 1 or claim 2, the heat-sealing tool for the covering material according to claim 3 is provided with a break portion for externally fitting over the pipe so as to be positioned between the end portions of the covering material. It is provided.

  According to a fourth aspect of the present invention, in the invention, the covering material and the heat-fusible sheet-like base material are made of polyolefin. It is characterized by that.

  The method for heat-sealing a covering material according to claim 5 is a method for heat-sealing a covering material using the heat-sealing tool for a covering material according to claim 1, wherein the heat-sealing method is performed between the end portions of the covering material. In the state where the tool is interposed, the heating member is energized to melt the end portions of the sheet-like base material and the covering material, and the end portions of the covering material are heat-sealed through the holes of the heating member. To do.

According to the present invention, the following effects can be exhibited.
The heat-sealing device of the covering material of the invention according to claim 1 is heated by energizing the heating member in a state of being interposed between the end portions of the covering material, and melting the end portions of the sheet-like base material and the covering material. The ends of the covering material are heat-sealed through the hole of the member. For this reason, it is not necessary to join the covering material at the outer peripheral portion of the covering material, and can be performed between the end portions of the covering material. Therefore, the construction for joining the covering materials is easy even in a narrow place, the joining strength between the covering materials is high, and as a result, heat loss can be suppressed and the occurrence of condensation can be prevented.

  In the heat sealing device for covering material according to claim 2, the heat-fusible sheet-like base material has a communication hole communicating with the hole of the heating member. For this reason, in addition to the effect of the invention according to claim 1, the end portions of the covering material can be joined more easily through the communication holes of the sheet-like base material.

  In the heat-sealing device for covering material according to claim 3, a fracture portion is provided so as to be fitted over the pipe and positioned between the end portions of the covering material. Therefore, in addition to the effect of the invention according to claim 1 or 2, it is possible to widen the heat-sealing tool by utilizing the fractured portion and easily fit it over the piping.

  In the heat sealing device for covering material according to claim 4, the covering material and the heat-fusible sheet-like base material are formed of polyolefin. Therefore, in addition to the effect of the invention according to any one of claims 1 to 3, the melting of the covering material and the sheet-like base material proceeds in the same manner, facilitating the bonding between the covering materials, and the bonding strength. Can be improved.

  A method for heat-sealing a covering material according to claim 5 is a method for heat-sealing a covering material using the heat-sealing tool for a covering material according to claim 1. That is, in a state in which a heat-sealing tool is interposed between the end portions of the covering material, the heating member is energized to melt the end portions of the sheet-like base material and the covering material, and the covering material through the hole of the heating member. The ends are heat-sealed. For this reason, it is possible to easily perform the construction for joining the covering materials even in a narrow place, and it is possible to increase the joining strength between the covering materials, thereby suppressing the heat loss and preventing the occurrence of condensation. it can.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments that are considered to be the best of the present invention will be described in detail with reference to the drawings.
(First embodiment)
As shown in FIGS. 1 (a) and 1 (b), a heat-sealing tool 10 (also simply referred to as a heat-sealing tool) of a covering material according to this embodiment includes a covering material 12 that covers a pipe 11 such as a hot water pipe, For example, the end portions of the heat insulating material are joined by heat fusion (heat fusion). The heat-sealing tool 10 is a heating member for electric heating having a hole 14 having a front hexagonal shape on a heat-fusible sheet-like base material 13 formed in an annular shape so as to correspond to the covering material 12. 15 is provided and is configured in a sheet shape. Specifically, the heating member 15 is formed by printing the raw material of the heating member 15 on the sheet-like base material 13 by a screen printing method according to a conventional method. An insertion hole 18 through which the pipe 11 is inserted is provided in the center of the heat fusion tool 10.

  As shown in FIGS. 3A and 3B, the heat-fusible sheet-like base material 13 is formed in an annular shape so as to correspond to the covering material 12. A first breaking portion 16a is provided. The sheet-like base material 13 is provided with a large number of communication holes 17 having a certain size and having a circular shape at regular intervals in the circumferential direction and the diameter direction. The communication holes 17 are arc-shaped holes when located on the inner and outer peripheral edges of the sheet-like base material 13.

  FIGS. 2A and 2B are views showing only the heating member 15 for electric heating formed on the sheet-like base material 13. As shown in these drawings, the heating member 15 for electric heating is formed in an annular shape so as to correspond to the covering material 12, and a second breakage portion 16 b as a breakage portion 16 is formed at one position thereof in the sheet shape. It is provided at the same position as the first fracture portion 16 a of the base material 13. And it is comprised so that the heat sealing | fusion tool 10 can be spread using the fracture | rupture part 16 which consists of these 1st fracture | rupture parts 16a and 2nd fracture | rupture parts 16b, and it can be fitted and fitted over the piping 11. FIG.

  The heating member 15 has a large number of holes 14 of a certain size having a front hexagonal shape at regular intervals in the circumferential direction and the diameter direction. The hole 14 is provided at a position corresponding to the communication hole 17 of the sheet-like base material 13 when the heating member 15 is formed on the sheet-like base material 13, and is configured to communicate with the communication hole 17. . A pair of electrodes 19 is provided on the outer peripheral portion of the heating member 15, and lead wires 20 are connected to both the electrodes 19. By energizing the heating member 15 through the lead wire 20 and the electrode 19, the heating member 15 is heated to a temperature at which the covering material 12 and the sheet-like base material 13 are melted.

  The pipe 11 is made of a metal such as copper or iron, or a synthetic resin such as cross-linked polyethylene or polybutene. The covering material 12 such as a heat insulating material is formed of a polyolefin foam such as a polyethylene foam, a rubber foam or the like. The sheet-like base material 13 is formed of a synthetic resin such as polyolefin such as polyethylene, polyester, or polyamide. Polyolefin is excellent in heat melting property, and synthetic resins such as polyester and polyamide are excellent in adhesion to the covering material 12. As the polyolefin, polyethylene (melting point: 110 to 140 ° C.), polypropylene (melting point: 130 to 160 ° C.) and the like are used. Among these polyolefins, polyethylene is preferable in that it has a low melting point, is easy to heat-seal, and can increase the heat-seal strength.

  Here, the covering material 12 is composed of, for example, an inner covering material 12a on the inner peripheral side and an outer covering material 12b on the outer peripheral side. However, the covering material 12 can be composed of a single layer of only the inner covering material 12a or can be composed of two or more layers. The inner covering material 12a is made of, for example, highly foamed crosslinked polyethylene, and the outer covering material 12b is made of, for example, highly foamed non-crosslinked polyethylene. The highly foamed cross-linked polyethylene, which is the inner covering material 12a that is in direct contact with the pipe 11, is superior in heat resistance to the highly foamed non-crosslinked polyethylene, and is configured to withstand the high heat of the pipe 11.

  As shown in FIGS. 1A and 1B, in a state where the heating member 15 is formed on the sheet-like base material 13 by printing, the first breaking portion 16 a of the sheet-like base material 13 is the heating member 15. The rupture portion 16 is formed so as to overlap the second rupture portion 16 b, and the communication hole 17 of the sheet-like base material 13 is communicated with the hole portion 14 of the heating member 15. For this reason, when the heat-sealing device 10 is sandwiched between the end portions of the covering material 12 and then heated by energizing the heating member 15, the end portions of the covering material 12 and the sheet-like base material 13 of the heat-sealing device 10 are formed. It melt | dissolves, those melts flow through the hole 14 of the heating member 15, are solidified in that state, and are comprised so that the edge part of the coating | covering material 12 may be joined.

  The heating member 15 is made of a metal material such as nickel, a nickel-chromium alloy, aluminum, or iron. By using this metal material, the heating member 15 is heated to a temperature lower than the melting point of the metal material and higher than the melting point of the sheet-like base material 13 and the covering material 12, thereby end portions of the sheet-like base material 13 and the covering material 12. Can be easily melted, and the ends of the covering material 12 can be heat-sealed.

Next, a method for heat-sealing the covering material 12 using the above-described heat-sealing tool 10 for the covering material 12 will be described.
Now, as shown in FIG. 4, the covering materials 12 at the joints 21 at the ends of the two pipes 11 are arranged in both directions of the axis of the pipe 11 so that the ends of the pipes 11 are exposed (the left-right direction in FIG. 4). Move little by little. In this case, the covering material 12 can be cut in the axial direction by a required length (split), and the covering material 12 at that portion can be removed. The end of one pipe 11 is enlarged in diameter to become an enlarged diameter part 11a, and the end of the other pipe 11 is fitted into the enlarged diameter part 11a. In this state, the end portions of the pipe 11 are joined together by means such as welding in accordance with a conventional method to form the joint portion 21.

  Thereafter, the heat-sealing tool 10 is externally fitted at the position of the joint portion 21 between the pipes 11 (between the ends of the covering material 12). That is, the fracture portion 16 of the heat-sealing tool 10 is slightly opened in the axial direction or the circumferential direction of the heat-sealing tool 10, and both ends thereof are moved so as to slide along the outer periphery of the joint portion 21 of the pipe 11. The heat-sealing tool 10 is mounted on the outer periphery of the joint portion 21 of the pipe 11. Subsequently, as shown in FIG. 5, the end surfaces of both the covering materials 12 are pressed against both surfaces of the heat-sealing tool 10.

  In this state, when the heating member 15 is energized through the lead wire 20 and the electrode 19 to increase its temperature, the end portions of the sheet-like base material 13 and the covering material 12 are gradually melted. For example, the temperature of the heating member 15 is raised to 250 ° C., and heating is performed for about 5 seconds when the thickness of the covering material 12 is 10 mm, and for about 10 seconds when the thickness of the covering material 12 is 20 mm. As shown in FIG. 6, when the end portions of the sheet-like base material 13 and the both covering materials 12 are melted, the melt flows through the holes 14 of the heating member 15, The parts are heat-sealed. Then, when it cools to room temperature, the melt of the edge part of the sheet-like base material 13 and both the covering materials 12 will solidify, and joining between the edge parts of both the covering materials 12 will be completed.

The effects exhibited by the above first embodiment will be described collectively below.
-The thermal fusion tool 10 of the first embodiment energizes the heating member 15 in a state of being interposed between the end portions of the covering material 12, and melts the end portions of the sheet-like base material 13 and the covering material 12, The end portions of the covering material 12 are heat-sealed through the hole portions 14 of the heating member 15. For this reason, it is not necessary to join the covering material 12 at the outer peripheral portion of the covering material 12, and can be performed between the end portions of the covering material 12. Therefore, the construction for joining the covering materials 12 is easy even in a narrow place such as a site where a building is being remodeled, and the joining strength between the covering materials 12 is high. As a result, heat loss is suppressed and the occurrence of condensation is prevented. be able to.

  Since the sheet-like base material 13 has a communication hole 17 that communicates with the hole 14 of the heating member 15, the melt of the covering material 12 causes the communication hole 17 of the sheet-like base material 13 and the heating member 15 to It flows easily through the hole part 14, and can join between the edge parts of the coating | covering material 12 more easily.

  -Since the heat-sealing tool 10 is fitted over the pipe 11 and is provided with a break portion 16 for positioning between the end portions of the covering material 12, heat fusion using the break portion 16 is provided. The wearing tool 10 can be spread and fitted over the pipe 11 for easy mounting.

  -Since the covering material 12 and the sheet-like base material 13 are formed of polyolefin, melting of the covering material 12 and the sheet-like base material 13 proceeds in the same manner, and the joining between the covering materials 12 becomes easy, Bonding strength can be improved.

  The heating member 15 is formed of a metal material, and the heating member 15 is heated to a temperature lower than the melting point of the heating member 15 to a temperature higher than the melting points of the sheet-like base material 13 and the covering material 12. And the edge part of the coating | covering material 12 can be fuse | melted, and between the edge parts of the coating | covering material 12 can be heat-sealed easily.

The coating material 12 is heat-sealed by using the heat-sealing tool 10 and energizing the heating member 15 in a state where the heat-sealing tool 10 is interposed between the ends of the covering material 12. The ends of the material 13 and the covering material 12 are melted and the ends of the covering material 12 are heat-sealed through the hole 14 of the heating member 15. Therefore, the construction for joining the covering materials 12 can be easily performed even in a narrow place, and the joining strength between the covering materials 12 can be increased. As a result, heat loss is suppressed and the occurrence of condensation is prevented. Can do.
(Second Embodiment)
In the second embodiment, the covering material 12 in the joint portion 21 of the pipe 11 is cut and removed, and both ends and the cut portion of the covering material cut out after the welding of the pipe 11 are fused by the heat fusion tool 10. An example is shown.

  As shown in FIG. 7, when cutting out the covering material 12, the cutting material is cut along the axis of the covering material 12, and the covering material is cut in the direction perpendicular to the axial direction of the covering material 12 at both ends of the cut portion 22. 12 is cut to obtain a cutout covering material 23. And after fitting the end part of the other piping 11 to the enlarged diameter part 11a of one piping 11, and welding, the joint part 21 of the piping 11 is coat | covered by expanding the said cutting | disconnection coating | covering material 23. . Next, both end faces of the cut out covering material 23 and end faces of both covering materials 12 covering both pipes 11 are heat-sealed by the same operation using the same heat fusion tool 10 as in the first embodiment. In this case, both end portions of the cutout covering material 23 can be simultaneously bonded to both the covering materials 12 by the two heat-sealing tools 10.

  Next, fusion of the cut portion 22 of the cut covering material 23 will be described. A square sheet-like member corresponding to the size of the cut portion 22 of the cut covering material 23 is prepared as the heat fusion tool 10. A pressure-sensitive adhesive sheet 24 is adhered to one end face (upper end face in FIG. 7) of the heat-sealing tool 10 so as to have a T-shaped cross section as a whole. And the heat sealing | fusion tool 10 is inserted in the clearance gap between the notch parts 22 of the cutting | disconnection coating | covering material 23, the both end surfaces of the cutting | disconnection part 22 of the cutting | disconnection coating | covering material 23 are pressed on both surfaces of the heat sealing | fusion tool 10, and the adhesive sheet 24 is in that state. Is bonded to the outer peripheral surface of the covering material 23. Thereafter, by energizing the heating member 15 of the thermal fusion tool 10, the cut portion 22 of the cut covering material 23 can be thermally fused.

In addition, the said embodiment can also be changed and implemented as follows.
The heat fusion tool 10 may be formed into an elongated square sheet shape and wound around the outer peripheral surface of the covering material 12 for use. This another example will be described.

  As shown in FIG. 8, the joint portion 21 of the pipe 11 is provided with a covering material 12 that covers both pipes 11. In this case, the end faces of the both covering materials 12 are not joined and can be moved relative to each other. The outer peripheral surfaces of these covering materials 12 are covered with an overlap covering material 25 having the same material structure as that of the two covering materials 12. The overlap covering material 25 is set to a length that sufficiently covers both the covering materials 12 covering the joint portion 21 of the pipe 11. The overlap covering material 25 is joined to the covering material 12 covering the one pipe 11.

  That is, the heat-sealing tool 10 is formed in an elongated rectangular sheet shape, and is wound around and fixed to the outer peripheral surface of one of the covering materials 12. This heat-sealing tool 10 is wound around the outer peripheral surface of one coating | covering material 12 so that the sheet-like base material 13 side may become an outer peripheral surface. In this state, the overlap covering material 25 is fitted so as to cover the outer peripheral surfaces of both covering materials 12. Then, by energizing the heating member 15 of the heat-sealing tool 10, the overlap covering material 25 is heat-sealed and bonded to the one covering material 12 via the heat-sealing tool 10. Since the overlap covering material 25 is not joined to the other covering material 12, the overlap covering material 25 and the other covering material 12 can be moved relative to each other. In this case, even if the other covering material 12 moves relative to the overlap covering material 25, the overlap covering material 25 has a sufficient length, so that the joint portion 21 of the pipe 11 is covered. Can do.

  By the way, as explained in the first embodiment or the second embodiment, when all the covering materials 12 in the joint portion 21 of the pipe 11 are joined by the heat-sealing tool 10, a plurality of the joining materials 12 contracted by the shrinkage of the covering material 12. A tensile force may act on the end portion of the covering material 12, and the piping 11 may be exposed at the end portion of the covering material 12. However, by using the overlap covering material 25 as described above, the other covering material 12 can move relative to the overlap covering material 25, so that the shrinkage of the covering material 12 can be sufficiently absorbed. .

  In the form of the other example, the heat-sealing tool 10 can be wound around the outer peripheral surface of one covering material 12 so that the heating member 15 side is the outer peripheral surface. Furthermore, a heat insulating material or a skin material may be laminated in advance on the surface (surface serving as the outer peripheral surface) of the heat-sealing tool 10 in the form of a sheet.

  In addition, the heat-sealing tool 10 is formed in a cylindrical shape in advance and is configured to be fitted on the outer periphery of one of the covering materials 12, or the heat-sealing tool 10 is formed in an annular shape with a cut in advance. It is also possible to configure such that the covering material 12 is slightly expanded and inserted into the outer periphery of the covering material 12.

  -As shown in FIG. 9, it is also possible to use as a heating member 15 the thing (sheet | seat heater) formed in the strip | belt shape with an electroconductive thin plate, making it spiral. That is, the heating member 15 is formed so as to be wound in an annular shape approximately 360 degrees in the clockwise direction on the outermost periphery, bent inward from the position, and formed in an annular shape approximately 360 degrees in the counterclockwise direction from the position. These are repeated in order to form a spiral to the center. A gap formed between the heating members 15 is a hole 14. The heating member 15 can also be formed of a linear member such as a nichrome wire.

  The communication hole 17 of the sheet-like base material 13 can be omitted. In this case, the sheet-like base material 13 does not have the communication hole 17 in a normal state. However, a plurality of portions of the sheet-like base material 13 are melted by the heating member 15 heated by energization, and the communication holes 17 are formed. As a result, the melt at the end of the covering material 12 flows through the communication hole 17 of the sheet-like base material 13 and the hole portion 14 of the heating member 15, and the covering material 12 is joined.

  -If adhesive processing is applied to the surface of the heat-sealing tool 10 and a release paper is pasted together, the release paper is peeled off when the heat-sealing tool 10 is used, and is accurately attached to the end face of the covering material 12 for positioning. Thus, workability can be improved and the occurrence of condensation can be suppressed.

  When the outer peripheral surface of the covering material 12 has, for example, a quadrangular cross section, a hexagonal cross section, etc., the sheet-like base material 13 and the heating member 15 can be formed into a quadrangular cross section, a hexagonal cross section, etc. according to the shape. .

  The hole 14 of the heating member 15 means a space formed in a part of the heating member 15, and the shape thereof is not limited to a circular shape, and may be any shape such as an elliptical shape or an elongated groove shape. The shape of the communication hole 17 of the sheet-like base material 13 is also a space portion formed in the sheet-like base material 13 and can be set as appropriate, and can be set to the same shape as the hole portion 14 of the heating member 15. it can.

-The fracture | rupture part 16 of the heat sealing | fusion tool 10 of the coating | covering material 12 is abbreviate | omitted, for example, before joining the edge part of the piping 11, it is also possible to use by inserting from the edge part of the piping 11.
The covering material 12 is not limited to the heat insulating material, and may be a protective material that protects the pipe 11, a buffer material, or the like.

Further, the technical idea that can be grasped from the embodiment will be described below.
The heat sealing device for a covering material according to claim 4, wherein the polyolefin is polyethylene. When comprised in this way, the effect of the invention which concerns on Claim 4 can be improved further.

  The heat-sealing device for a covering material according to any one of claims 1 to 4, wherein the heat-sealing device is a sheet. When comprised in this way, in addition to the effect of the invention which concerns on any one of Claims 1-4, a heat sealing | fusion tool can be favorably interposed between the edge parts of a coating | covering material.

  The heat-fusible sheet-like base material is provided with a communication hole that communicates with the hole of the heating member so that the melt of the coating material flows through the communication hole. Item 6. A method for heat-sealing a coating material according to Item 5. According to this method, in addition to the effect of the invention according to claim 5, for example, when the melting point of the covering material is lower than the melting point of the sheet-like substrate, the melt of the covering material is caused to flow through the communication holes of the sheet-like substrate. Thus, joining between the end portions of the covering material can be performed more easily and firmly.

  〇 The heat-sealing tool is provided with a rupture portion that is externally fitted to the pipe so as to be positioned between the end portions of the covering material, and the end portion of the heat-fusion device is widened using the rupture portion, The method for heat-sealing a coating material according to claim 5, wherein a heat-sealing tool is fitted on the pipe. According to this method, in addition to the effect of the invention according to the fifth aspect, the heat-sealing tool can be easily fitted on the pipe.

(A) is sectional drawing which shows the heat-fusion tool of the coating | covering material in 1st Embodiment, (b) is a front view which shows the heat-fusion tool of a coating | covering material. (A) is sectional drawing which shows the heating member in 1st Embodiment, (b) is a front view which shows a heating member. (A) is sectional drawing which shows the sheet-like base material in 1st Embodiment, (b) is a front view which shows a sheet-like base material. The disassembled perspective view which shows the state which externally fits the thermal fusion tool of a coating | covering material to the junction part of piping. The perspective view which shows the state which joined between the edge parts of the coating | covering material of piping with the heat sealing | fusion tool. Sectional drawing which shows the state which joined between the edge parts of the coating | covering material of piping with the heat sealing | fusion tool. The perspective view which decomposes | disassembles and shows the state which heat-seal | fuses between coating | covering materials using the thermal-fusion tool of the coating | covering material in 2nd Embodiment. The perspective view which decomposes | disassembles and shows the state which heat-seal | fuses a coating | covering material using the heat-fusion tool in the form of another example. Explanatory drawing which shows another example of the heating member formed in the spiral shape.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Thermal fusion tool, 11 ... Piping, 12 ... Coating | covering material, 13 ... Sheet-like base material, 14 ... Hole part, 15 ... Heating member, 16 ... Breaking part, 17 ... Communication hole.

Claims (5)

In order to join the end portions of the covering material covering the pipe by heat-sealing, a hole is provided on the heat-fusible sheet-like base material formed in an annular shape so as to correspond to the covering material. A heat fusion tool provided with a heating member for electric heating,
The heating member is energized in a state of being interposed between the end portions of the covering material, the end portions of the sheet-like base material and the covering material are melted, and the end portions of the covering material are heat-sealed through the holes of the heating member. A heat-sealing device for a covering material, characterized in that it is configured as described above. The said heat-fusible sheet-like base material has the communicating hole connected to the hole of a heating member, The heat-fusion tool of the coating | covering material of Claim 1 characterized by the above-mentioned. The heat sealing tool for a covering material according to claim 1 or 2, further comprising a break portion that is fitted over the pipe so as to be positioned between end portions of the covering material. The covering material and the heat-fusible sheet-like base material are made of polyolefin, and the covering material heat-sealing tool according to any one of claims 1 to 3. A method for heat-sealing a covering material using the heat-sealing tool for a covering material according to claim 1,
In a state where a thermal fusion tool is interposed between the end portions of the covering material, the heating member is energized to melt the end portions of the sheet-like base material and the covering material, and the end of the covering material is inserted through the hole portion of the heating member. A method for heat-sealing a covering material, wherein the parts are heat-sealed.

Images