JP4366509B2 - Locating tape - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
  The present invention relates to a locating table that is installed in a resin pipe body that is laid in the ground and used as a conduit for various fluids.ToRelated.
[0002]
[Prior art]
When constructing a fluid conduit by laying a polyethylene resin pipe body underground, the non-open cutting method can alleviate the impact on road traffic and the surrounding environment, improve construction efficiency, and reduce excavation soil. There are advantages such as being able to be used, and it is often used in the construction of pipelines.
[0003]
In this non-open cutting method, a drilling head is drilled with a drilling head provided at the tip of the rod between the starting shaft and the reaching shaft, and a resin pipe body is connected to the rear end of the rod, and the rod is pulled out to the reaching shaft side. Pull the resin tube body into the drilling hole, or connect the resin tube body to the tip of the rod at the reaching shaft, and pull the resin tube body back into the drilling hole by pulling the rod back. The main body is laid.
[0004]
As another non-cutting method, a resin pipe main body is also drawn into an existing metal pipe.
[0005]
In addition, when using the resin pipe body as an embedded pipe, a conductive wire (locating wire) or a locating tape having a conductive layer is attached to the resin pipe body, and a direct current is passed through the conductive wire or conductive layer (direct method). ) When a direct current cannot be applied, magnetic lines of force are generated from the ground, and an induced current is applied to the conductive layer of the locating tape to generate magnetic lines of force around the resin tube body. Resin so that the position of the resin pipe body can be confirmed from the resin (indirect method), or by attaching a display tape to the resin pipe body so that the name, manager, pressure, year of burial, etc. can be displayed during exposure. It is necessary to apply a locating means to the pipe body.
[0006]
As described above, in the non-open cutting method, the resin pipe main body is drawn into the underground drilling holes or existing metal pipes. Depending on the conditions, the resin pipe main body may have friction with earth and sand or existing metal pipes during the drawing. It is necessary to take measures to prevent the occurrence of damage due to the above, and of course, the locating tape affixed to the outer surface of the resin tube body must be protected as well.
[0007]
Therefore, the present applicant can improve the wear resistance strength of the resin pipe main body, and does not need to increase the drilling hole at the time of embedding, and reduces the amount of protrusion to the outer surface of the resin pipe main body at the time of drawing. Japanese Patent Application No. 2002-147314 proposed a resin tube with a locating tape protection function that prevents an increase in resistance and that the locating means does not hinder the flexibility and expansion and contraction of the resin tube main body.
[0008]
This locating tape protective resin tube is a locating tape having a conductive layer attached along the axial direction on the outer periphery of the resin tube body, and the conductive layer of this locating tape is formed of a stretchable metal net, The outer surface of the resin tube main body and the locating tape are made of a transparent synthetic resin protective layer, for example, a polyolefin or a copolymer of polyolefin and another polymer, and the resin tube main body and the outer surface of the locating tape are extruded. The structure is covered with the formed protective layer.
[0009]
By the way, when the resin pipe with the locating tape protection function is pulled into the ground, if the frictional force is applied to the locating tape through the protective layer and the locating tape fixing force to the resin pipe body is weak, the locating tape Excessive pulling force may be applied due to peeling from the resin tube main body and the like, and there may be a situation in which it breaks or shifts in the length direction, and in extreme cases it breaks.
[0010]
In addition, the resin pipe body drawn into the ground is electrically connected to the conductive layer of the locating tape when the ends are connected to each other. The locating tape is peeled off at a predetermined length at the end, and the conductive layer is exposed at the end of the peeled locating tape, and the exposed portion is connected via a connecting metal net.
[0011]
Therefore, the mounting of the locating tape to the resin tube body requires the contradictory conditions of the fixing strength that can withstand the tensile force in the longitudinal direction caused by the friction at the time of pulling in and the easy peelability that facilitates the connection work of the conductive layer. Will be.
[0012]
The locating tape to be attached to the resin tube main body proposed above is formed by attaching a metal net with an adhesive layer using butyl rubber on one side of the synthetic resin display tape, and the locating tape is fixed to the resin pipe main body. Was stuck to the resin tube body with the above-mentioned pressure-sensitive adhesive layer.
[0013]
[Problems to be solved by the invention]
However, the adhesive layer using butyl rubber does not have sufficient fixing strength of the locating tape to the resin tube main body, so that the work of peeling the end of the locating tape from the resin tube main body can be performed without any trouble. On the contrary, the fixing strength is weak against the pulling force in the length direction due to friction at the time of pulling in the resin tube body, and the locating tape may be peeled off from the resin tube body or move in the length direction at the time of pulling There was room for improvement.
[0014]
  Accordingly, the object of the present invention is to provide a locating that can secure a fixing strength that can withstand a tensile force in the longitudinal direction due to friction when the resin tube main body is pulled in, and that can easily remove the end portion from the resin tube main body. TheTheIt is to provide.
[0015]
[Means for Solving the Problems]
  In order to solve the above-mentioned problems, the invention of claim 1 is a locating tape having a conductive layer and attached to the outer periphery of the resin tube main body along the axial direction.BecauseThe conductive layer is made of a stretchable metal net, and the metal net is covered with a thermoplastic synthetic resin coating layer, and at least the side of the coating layer welded to the resin tube body has a lower melting point than the resin tube body. Formed of thermoplastic synthetic resinTKating tapeIn the above, the coating layer is formed by laminating a thermoplastic synthetic resin layer having a melting point lower than that of the resin tube main body with a metal net sandwiched between the overlapping surfaces.The configuration is adopted.
[0016]
  The invention of claim 2A locating tape having a conductive layer and attached to the outer periphery of the resin tube main body along the axial direction, wherein the conductive layer is made of a stretchable metal net, and the metal net is covered with a thermoplastic synthetic resin coating layer. Covering and covering at least the side of the coating layer that is welded to the resin tube body with a locating tape formed of a thermoplastic synthetic resin having a melting point lower than that of the resin tube body.A thermoplastic synthetic resin layer with a lower melting point than the resin tube body is laminated with the metal net sandwiched between the overlapping surfaces.The synthetic resin layer is formed by laminating a thermoplastic synthetic resin layer having a higher melting point than the protective layer for covering the outer surface of the resin tube main body and the locating tape on the surface opposite to the welding side to the resin tube main body. The structure can be made.
[0017]
  The invention of claim 3A locating tape having a conductive layer and attached to the outer periphery of the resin tube main body along the axial direction, wherein the conductive layer is made of a stretchable metal net, and the metal net is covered with a thermoplastic synthetic resin coating layer. Covering and covering at least the side of the coating layer that is welded to the resin tube body with a locating tape formed of a thermoplastic synthetic resin having a melting point lower than that of the resin tube body.Thermoplastic synthetic resin layer with a lower melting point than the resin tube bodyAnd a thermoplastic synthetic resin layer having a melting point higher than that of the protective layer for covering the outer surface of the resin tube body and the locating tape, and laminated with a metal net sandwiched between them. Can do.
[0019]
  AboveLocating tapeIsWelded along the axial direction to the outer periphery of the resin tube body, and the outer surface of the resin tube body and locating tape are welded with a protective layer of thermoplastic synthetic resin that has excellent wear resistance and allows the resin tube body to be seen through. Coatingcan do.
[0020]
  Also, aboveThe locating tape is a thermoplastic synthetic resin that is welded along the axial direction to the outer periphery of the resin tube main body, and the outer surface of the resin tube main body and the locating tape has excellent wear resistance and allows the resin tube main body to be seen through. Welded and coated with a protective layer, and provided a release material layer between the overlapping surfaces of the locating tape and protective layerCan be.
[0021]
The resin tube main body is formed using a polyolefin resin, for example, polyethylene, and the thermoplastic synthetic resin layer forming the locating tape also uses the polyolefin resin as in the resin tube main body.
[0022]
The locating tape is attached to the resin tube main body by welding the locating tape and the resin tube main body while the locating tape and the resin tube main body are heated and applying pressure to the resin pipe main body.
[0023]
At this time, the overlapping surface side of the locating tape covering layer to the resin tube body is made of a synthetic resin having a melting point lower than that of the resin tube body, so the heating temperature during welding is set to the welding temperature of the coating layer. In addition, the resin tube main body does not cause thermal alteration, and such fixing by heat welding can secure the fixing strength of the coating layer that can withstand the tensile force in the length direction due to friction when the resin tube main body is retracted. At the same time, it has an easy peelability that allows the end portion to be peeled off from the resin tube main body.
[0024]
The metal net has a thin thickness of about 0.5 mm and is rich in elasticity by selecting a weaving method. By following the expansion and contraction of the resin tube main body, it does not hinder the expansion and contraction of the resin tube main body. The amount of protrusion to the outer surface is reduced, and the occurrence of increased friction when the resin tube main body is drawn into the hole can be reduced.
[0025]
In addition, the above-described protective layer is formed using a thermoplastic resin having high elasticity and strength, such as a polyolefin or a copolymer of polyolefin and another polymer, and the like. It is formed by extrusion so as to cover the outer surface, and this protective layer is welded to the outer surface of the resin tube main body and the locating tape in a state where it can be peeled off.
[0026]
Polyethylene can be exemplified as the polyolefin forming the protective layer, and an ethylene-methacrylic acid copolymer is preferably used as a copolymer of the polyolefin and another polymer.
[0027]
In addition, an ionomer resin in which molecules of an ethylene-methacrylic acid copolymer, which is a copolymer of polyolefin and another polymer, are crosslinked with metal ions can be used.
[0028]
The resin material that forms such a protective layer has better wear resistance than the resin tube main body, and can prevent the resin tube main body and the locating tape from being damaged when the resin tube main body is drawn into the hole. In addition, strength is obtained by welding to the resin tube main body and the locating tape, and since it has excellent wear resistance, the thickness can be reduced to 1.5 mm or less, and the flexibility of the resin tube main body is impaired. Since the outer diameter of the resin tube main body does not increase, the diameter of the drilling hole can be reduced.
[0029]
Further, examples of the material used for forming the release material layer provided between the outer surface of the locating tape and the protective layer may include an ultraviolet curable resin and an acrylic resin, and these materials may be used as the outer surface of the locating tape. It is formed by coating or spraying on the surface, and the peelability of the protective layer with respect to the locating tape is improved.
[0030]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0031]
As shown in FIG. 4, a resin tube 1 with a locating tape protection function is formed by welding a locating tape 4 having a metal net 3 serving as a conductive layer over the entire length in the axial direction on the outer periphery of a resin tube main body 2. The outer surface of the tube main body 2 and the locating tape 4 have a structure in which the outer surfaces of the tube main body 2 and the locating tape 4 are integrally covered with a protective layer 5 made of synthetic resin, which is superior in wear resistance than the resin tube main body 2 and can be seen through.
[0032]
The resin tube main body 2 is made of polyethylene and has a predetermined inner diameter and thickness, and the protective layer 5 is an intermolecular molecule of an ethylene-methacrylic acid copolymer which is a polyolefin or a copolymer of polyolefin and another polymer. Is formed by extrusion so as to cover the outer surface of the resin tube main body 2 and the locating tape 4 and can be peeled off from the resin tube main body 2 and the outer surface of the locating tape 4. Welded in state.
[0033]
Examples of the polyolefin include polyethylene, and an ionomer resin in which molecules of an ethylene-methacrylic acid copolymer, which is a copolymer of polyolefin and another polymer, are crosslinked with metal ions can be used.
[0034]
As a specific example, it is preferable to use an ethylene-methacrylic acid copolymer (Nucleel manufactured by Mitsui-DuPont Polychemical Co., Ltd.). As an ionomer of a copolymer of polyolefin and another polymer, an ethylene-methacrylic acid copolymer is used. Polymer ionomers (High Milan manufactured by Mitsui DuPont Polychemical Co., Ltd.) can be mentioned.
[0035]
The resin material for forming such a protective layer 5 is more excellent in wear resistance, elasticity and flexibility, cold resistance, etc. than the resin tube body 2 and impairs the flexibility and stretchability of the resin tube body 2. Since the strength can be secured by welding to the resin tube main body 2 and the locating tape 4, the thickness can be reduced to 1.5 mm or less, and the diameter of the resin tube main body 2 can be reduced by such thickness. In addition, the resin tube main body 2 and the locating tape 4 can be prevented from being damaged when the resin tube main body 2 is drawn into the drilling hole, and the non-cutting method for embedding the resin tube main body 2 in the ground. It is suitable, and the resin tube main body 2 can be inserted into the ground without difficulty, thereby improving workability.
[0036]
The locating tape 4 of the first example shown in FIG. 1 is composed of a coating layer 6 and a metal net 3 embedded therein, and a thermoplastic synthetic resin having a melting point lower than that of the resin tube main body 2 is used for forming the coating layer 6. The tube 6a is used, the metal net 3 is accommodated inside the tube 6a, the tube 6a is pressed and folded into two to form a flat band, and two synthetic resin layers formed by the two-fold tube 6a. The metal net 3 is sandwiched between the two.
[0037]
The metal net 3 is made of, for example, copper or stainless steel and has a thin width of about 15 mm and a thickness of about 0.5 mm, and may be a plain weave. However, if a bias weave rich in elasticity is used, the metal net 3 follows the expansion and contraction of the resin tube body 2. Thus, there is an advantage that the expansion and contraction of the resin tube main body 2 is not obstructed, and the metal net 3 is provided over the entire length of the covering layer 6 so as to be positioned at the center in the width direction of the covering layer 6 having a width of 30 mm. Since the width of the metal net 3 can be set as wide as 15 mm, when an embedded position of the resin tube main body is confirmed from the ground, an induced current is passed through the metal net 3 to generate magnetic lines of force around the resin pipe main body 2. Therefore, the buried position from the ground can be confirmed accurately by the metal probe.
[0038]
The locating tape 4 of the second example shown in FIG. 2 uses a tube 6a of a thermoplastic synthetic resin having a melting point lower than that of the resin tube main body 2 for forming the coating layer 6, and a metal net 3 inside the tube 6a. The tube 6a is pressed and folded in half to form a flat band shape. The metal net 3 is sandwiched between two synthetic resin layers formed by the tube 6a, and the resin layer body 2 of the covering layer 6 is inserted. The thermoplastic synthetic resin layer 8 having a melting point higher than that of the protective layer 5 is laminated on the surface opposite to the welding side.
[0039]
The locating tape 4 of the third example shown in FIG. 3 includes a thermoplastic synthetic resin layer 9 having a melting point lower than that of the resin tube main body 2 and a thermoplastic synthetic resin layer 10 having a melting point higher than that of the protective layer 5. The covering layer 6 is formed by laminating the metal net 3 in a sandwiched state.
[0040]
In the locating tape 4 of each of the above examples, the thermoplastic synthetic resin having a melting point lower than that of the resin tube main body 2 used for forming the coating layer 6 and the thermoplastic synthetic resin having a melting point higher than that of the protective layer 5 are both resin tubes. A polyolefin resin similar to the main body 2 is used. In the first and second examples, the tube 6a is used to form the coating layer 6, but two sheets of thermoplastic synthetic resin sheets having a melting point lower than that of the resin pipe main body 2 are stacked. The covering layer 6 may be formed.
[0041]
Moreover, in any example, the overlapping surface of the synthetic resin layer or the synthetic resin sheet is welded by heating and pressing, and the mesh voids of the metal net 3 are filled with the molten resin, thereby improving the tensile strength of the metal net 3. It is supposed to let you.
[0042]
In addition to the example described above, the locating tape 4 has a structure in which a thermoplastic synthetic resin having a melting point lower than that of the resin tube main body 2 is used to extrude into a band shape, a metal net 3 is molded therein, and the resin band Instead of the thermoplastic synthetic resin layer having a melting point higher than that of the protective layer 5, an easily peelable coating material for the protective layer 5 may be applied to the surface opposite to the surface to be welded to the resin pipe body 2. Such a paint uses a polyethylene resin or a release agent, and the paint can be used as a color for the locating tape 4, a name of the pipe line, a manager, a pressure, an embedment year, or the like.
[0043]
In order to attach the locating tape 4 as described above to the outer surface of the resin tube main body 2, the locating tape 4 and, if necessary, the outer surface of the resin tube main body 2 are heated and located along the axial direction of the resin tube main body 2 The tape 4 is stacked, and the locating tape 4 is pressurized and welded.
[0044]
Since the surface of the covering layer 6 of the locating tape 4 that overlaps the resin tube main body 2 is formed of a synthetic resin having a melting point lower than that of the resin tube main body 2, the heating temperature during welding is applied to the resin tube main body 2. The welding temperature can be set so as not to cause thermal alteration, and fixing by such thermal welding ensures the fixing strength of the locating tape 4 that can withstand the tensile force in the length direction due to friction when the resin tube body 2 is pulled. In addition, since the resin tube body 2 is a synthetic resin having a higher melting point, there is a difference in hardness. Therefore, the pulling force in the direction of peeling the locating tape 4 from the resin tube body 2 is peelable. The end of the coating layer 6 is easy to peel off from the resin tube body 2.
[0045]
As described above, the resin tube main body 2 and the outer surface of the locating tape 4 are more excellent in wear resistance than the resin tube main body 2 with respect to the resin tube main body 2 to which the locating tape 4 is pasted over the entire length in the axial direction. A resin tube 1 with a locating tape protection function is formed by welding and coating a protective layer 5 of a thermoplastic synthetic resin through which the resin tube body can be seen through.
[0046]
The protective layer 5 is formed in a cylindrical shape by extruding a molten resin so as to cover the outer surfaces of the resin tube main body 2 and the locating tape 4, and the resin tube main body 2 and the locating tape 4 are heated by the heat of the molten resin. Welded to the outer surface.
[0047]
Since the protective layer 5 is made of a thermoplastic synthetic resin that is superior in wear resistance to the resin tube main body 2 and the resin tube main body can be seen through, the protective layer 5 and the covering layer 6 of the locating tape 4 The welded portion has a good releasability in terms of the pulling force in the direction of peeling off the protective layer 5, and therefore, if the protective layer 5 is cut with a cutting tool and peeled off, the end of the resin tube body 2 The locating tape 4 can be exposed smoothly.
[0048]
In particular, since the surface of the covering layer 6 of the locating tape 4 on which the protective layer 5 overlaps is formed of a thermoplastic synthetic resin layer having a melting point higher than that of the protective layer 5, the materials of the covering layer 6 and the protective layer 5 are the same or Thus, the welding strength between the covering layer 6 and the protective layer 5 is increased, and the fixing layer 5 can improve the fixing strength of the locating tape 4 to the resin tube main body 2.
[0049]
Further, in order to smoothly expose the locating tape 4 at the end portion of the resin tube main body 2, a release material layer is provided between the overlapping surfaces of the locating tape 4 and the protective layer 5 in each example described above. It can also be.
[0050]
Examples of the material used for forming the release material layer include an ultraviolet curable resin and an acrylic resin. By applying or spraying these materials on the outer surface of the locating tape 4 so as to have an appropriate thickness. A release material layer is formed, and through the release material layer, the peelability from the locating tape when the protective layer 5 is peeled off can be improved.
[0051]
As shown in FIG. 5, the locating tape 4 is provided with an indication “a” such as the name of the pipeline, the manager, the pressure, and the year of embedment on the outer surface of the covering layer 6 so that the resin pipe body 2 can be seen through. These are visible through the protective layer 5.
[0052]
The resin pipe 1 with a locating tape protection function formed as described above is a pipe for various fluids in the ground by drawing the resin pipe body 2 into a ground hole or an existing metal pipe using a non-cutting method. The road is constructed, and the protective layer 5 provided on the outer surface prevents the resin pipe body 2 and the locating tape 4 from being damaged due to friction with the earth and sand and the existing gas pipe at the time of drawing, and the resin pipe The metal net 3 of the locating tape 4 affixed over the entire length in the length direction of the main body 2 allows the embedded position to be confirmed with a detector from the ground by an electromagnetic induction method or a direct method of flowing current, and the protective layer 5 is made of resin. Since the pipe body 2 can be seen through, the type of pipe can be confirmed when the name, manager, pressure, year of embedment, etc. applied to the outer surface of the coating layer 6 are exposed.
[0053]
When the ends of the resin pipe main body 2 are connected to each other when the pipe is constructed, the metal net 3 of the locating tape 4 is also connected.
[0054]
The metal net 3 is connected by peeling off the protective layer 5 by a predetermined length at the end of the resin tube main body 2 to expose the end of the locating tape 4, and then covering the exposed coating layer of the locating tape 4. 6 is peeled off from the resin tube main body 2 to expose the metal net 3, and a metal net for connection is overlapped on the metal net 3 and bonded with a two-pronged fastener such as a stapler made of stainless steel or the like. 3 are electrically connected, and then the post-treatment of the end connecting portion of the resin tube main body 2 is performed.
[0055]
The metal net 3 of the locating tape 4 is formed by knitting a thin metal wire such as stainless steel into a strip shape, and is formed in a thin and flat tape shape with a thickness of 0.5 mm or less, so it has excellent stretchability. By following the expansion and contraction of the resin tube main body 2, the expansion and contraction of the resin tube main body 2 is not hindered, and the locating tape 4 using such a metal net 3 has a protruding amount to the outer surface of the resin tube main body 2. Reduces the occurrence of increased friction when pulling resin pipes into drilled holes and existing metal pipes, and is suitable for construction using a propelling device for embedding. Improve.
[0056]
Incidentally, the thickness of the locating tape 4 including the metal net 3 is preferably set to 1.0 mm or less in any example, and when the protective layer 5 is extruded on the outer surface of such a thin locating tape 4. The adhesion of the protective layer 5 to the outer surface of the locating tape 4 and the resin tube main body 2 is good, and the display on the outer surface of the coating layer 6 can be clearly read, and the inner surface of the protective layer 5 can be located. There is almost no generation of voids on both sides of the tape 4, and even if the protective layer 5 is partially broken, muddy water can be prevented from entering the protective layer 5.
[0057]
Moreover, since the protective layer 5 is formed of an ionomer of polyethylene, ethylene-methacrylic acid copolymer, or ethylene-methacrylic acid copolymer, the strength, wear resistance, elasticity and flexibility are higher than those of the resin tube body 2. It is excellent in cold resistance, etc., and does not impair the flexibility and stretchability of the resin tube main body 2. When pulling the resin tube 1 into a drilling hole or existing gas tube, jigs and tools of the conventional non-opening method are used. The protective layer 5 can be reduced in thickness by adopting the locating tape 4 using the metal net 3 and the diameter of the resin pipe body 2 can be reduced. It is possible to prevent the resin tube main body 2 and the locating tape 4 from being damaged when the resin tube 1 is drawn into the tube.
[0058]
Further, the locating tape 4 employs a flat tape-shaped metal net 3 to minimize the amount of protrusion of the resin tube main body 2 to the outside, and into the drilled hole of the resin tube 1 or into the existing metal tube. Resin pipes can reduce the occurrence of local contact and friction when pulling in, and the weight of the product when it is stacked and stored, compared to the case where round or flat conductive wires are used for conductivity. Occurrence of the concave deformation of the main body 2 can be prevented.
[0059]
Since the locating tape 4 is attached over the entire length of the resin tube main body 2, after embedding, it is possible to easily check the display regardless of where the digging is performed, and the transparency of the protective layer 5 is good. Since the protective layer 5 is in close contact with the locating tape 4, the display on the locating tape 4 becomes clear.
[0060]
In addition, if the weather resistance of resin which forms the protective layer 5 is strengthened, the weather resistance of the resin pipe body 2 will be improved, and the resin pipe 1 can be stored outdoors.
[0061]
【The invention's effect】
As described above, according to the present invention, an elastic metal net is used for the conductive layer of the locating tape, and at least the side of the coating layer covering the metal net that is welded to the resin pipe main body is lower than the resin pipe main body. Because it is made of a thermoplastic synthetic resin with a melting point, it can secure a fixing strength that can withstand the tensile force in the longitudinal direction caused by friction when the resin tube body is pulled in the welded state of the locating tape to the resin tube body. The locating tape can be easily peeled from the resin tube main body, and the end of the locating tape is peeled off from the resin tube main body to electrically connect the metal net without any trouble.
[0062]
  Also, the locating tape is welded along the axial direction to the outer periphery of the resin tube main body, and the outer surface of the resin tube main body and the locating tape is excellent in wear resistance and can be seen through the resin tube main body. Welding coating with a protective layer of synthetic resinIf you doResin pipe body and locating tape can be protected from friction when the resin pipe is pulled in, and the resin pipe drilling and drawing into the existing metal pipe are efficient without causing damage to the resin pipe body and locating tape. Can be done.
[Brief description of the drawings]
FIG. 1 is an enlarged longitudinal sectional view showing a first example of a locating tape according to the present invention.
FIG. 2 is an enlarged longitudinal sectional view showing a second example of the locating tape according to the present invention.
FIG. 3 is an enlarged longitudinal sectional view showing a third example of the locating tape according to the present invention.
FIG. 4 is a longitudinal sectional view of a resin tube with a locating tape protection function using the locating tape according to the present invention.
FIG. 5 is a plan view showing an example of display on the locating tape.
[Explanation of symbols]
1 Resin pipe
2 Resin pipe body
3 Metal net
4 Locating tape
5 Protective layer
6 Coating layer
6a tube
8 Thermoplastic synthetic resin layer
9 Thermoplastic synthetic resin layer
10 Thermoplastic synthetic resin layer

Claims (3)

Has a conductive layer, a locating tape attached to the outer circumference of the resin pipe main body in the axial direction, a metal net stretchy to the conductive layer, the metal net with a coating layer of a thermoplastic synthetic resin cover, the side to weld at least a resin pipe main body of the coating layer, in Russia skating tapes having a low melting point of the thermoplastic synthetic resin than the resin pipe main body, the coating layer is lower than that of the resin pipe main body mp A locating tape characterized in that the thermoplastic synthetic resin layer is laminated with a metal net sandwiched between overlapping surfaces . A locating tape having a conductive layer and attached to the outer periphery of the resin tube main body along the axial direction, wherein the conductive layer is made of a stretchable metal net, and the metal net is covered with a thermoplastic synthetic resin coating layer. cover, the side to weld at least a resin pipe main body of the coating layer, the locating tapes having a low melting point of the thermoplastic synthetic resin than the resin pipe main body, the upper Symbol coating layer, lower than the resin pipe main body mp Laminate a thermoplastic synthetic resin layer with a metal net sandwiched between the overlapping surfaces, and cover the outer surface of the resin tube body and locating tape on the opposite side of the synthetic resin layer to the resin tube body. A locating tape formed by laminating a thermoplastic synthetic resin layer having a melting point higher than that of the protective layer . A locating tape having a conductive layer and attached to the outer periphery of the resin tube main body along the axial direction, wherein the conductive layer is made of a stretchable metal net, and the metal net is covered with a thermoplastic synthetic resin coating layer. cover, the side to weld at least a resin pipe main body of the coating layer, the locating tapes having a low melting point of the thermoplastic synthetic resin than the resin pipe main body, the upper Symbol coating layer, lower than the resin pipe main body mp It is formed by laminating a thermoplastic synthetic resin layer and a thermoplastic synthetic resin layer having a melting point higher than that of the protective layer for covering the outer surface of the resin tube main body and the locating tape with a metal net sandwiched therebetween. Locating tape.

Images