JP2009130999A - Lead wire for electrical wiring - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lead wire for electrical wiring and telecommunication cables better in electrical leading characteristics than conventional ones. <P>SOLUTION: The lead wire for electrical wiring is used in wiring a linear object within piping and prepared by using a synthetic resin monofilament having a sheath core composite structure, consisting of a polyester based resin in a core part and a mixture of 95 to 60 wt.% polyester based resin and 5 to 40 wt.% inorganic particles in a sheath part, in at least as a part of the constituent materials. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an improvement of a lead wire for wiring used when wiring a linear object such as an electric wiring or a communication cable in a pipe, and more specifically, the wiring property is excellent and sufficient. The present invention relates to a lead wire for wiring having strength and durability.

  In general, in wiring work in offices, shops, houses, factories, etc., a method of passing linear objects such as electrical wiring and communication cables into pre-laid pipes when the interior construction of the building is completed is adopted. Specifically, first, a lead wire called a lead wire is passed through a pre-laid pipe, and electrical wiring and communication cables are connected to one end side of this lead wire, and then the multi-end side of the lead wire is connected. By pulling it out of the pipe, a desired linear object is wired in the pipe.

 Conventionally, steel lead wires have been mainly used in these wiring operations. However, since steel lead wires have electrical conductivity, there is a risk of electric shock during wiring operations.

  Therefore, in recent years, instead of steel lead wires, attention has been paid to lead wires using insulating plastic as a material. For example, a composite linear body composed of synthetic resin monofilaments and metal wires has a basic structure. Lead wire for electrical wiring (see, for example, Patent Document 1), a lead wire in which a synthetic resin wire having a polygonal cross-sectional shape is stretched, and twisted rotation is applied to form a spiral twill on the outer surface (eg, Patent Reference 2), and lead wires in which polyethylene naphthalate is added to a polyester-based resin to improve the lineability in order to supplement the bending hardness of the synthetic resin monofilament (for example, see Patent Document 3) have been proposed.

  All of these lead wires have the characteristics of having the same strength as conventional steel lead wires without worrying about electric shock during wiring work. However, there was a problem such as bad, and further improvement was needed.

  In recent years, along with the reduction in the weight of electrical wiring and communication cables, the diameter of piping tends to be reduced. As a result, lead wires using plastic materials are also thinned, resulting in insufficient bending hardness and serious problems such as further lowering of the lineability.

Accordingly, there has been a frequent demand for the realization of plastic lead wires that maintain sufficient strength and durability and that have better wireability than conventional ones.
JP 2001-352630 A JP 2000-217217 A JP 2007-138314 A

  The present invention has been achieved as a result of studying the above-described problems in the prior art as problems.

  That is, an object of the present invention is to provide a lead wire for wire passing that maintains sufficient strength and durability and is superior to conventional wires.

  In order to achieve the above object, according to the present invention, there is provided a lead wire for wiring used when wiring a linear object in a pipe, in which a polyester resin is used for the core and a polyester resin 95-60 is used for the sheath. There is provided a lead wire for wiring, characterized in that a core-sheath composite structure synthetic resin monofilament using a mixture of wt% and inorganic particles of 5 to 40 wt% is at least a part of the constituent material.

In the lead wire for wiring of the present invention,
The core / sheath composite ratio of the core / sheath composite synthetic resin monofilament is in the range of 70 to 95/30 to 5 by weight ratio,
The particle size of the inorganic particles is in the range of # 46 to # 500 in the count indicated in the abrasive particle size JIS R6001,
A plurality of monofilaments are twisted together using at least one core-sheath composite synthetic resin monofilament, and the diameter or circumscribed circle diameter is in the range of 2.0 to 3.5 mm;
Are mentioned as preferable conditions, and more excellent effects can be obtained by satisfying these conditions.

  According to the present invention, as described below, it is possible to obtain a lead wire for wiring that maintains sufficient strength and durability and is superior to conventional ones.

  Hereinafter, the lead wire for wiring of the present invention product (hereinafter, simply referred to as a lead wire) will be specifically described.

  The lead wire of the present invention constitutes a core-sheath composite structure synthetic resin monofilament using a polyester resin for the core and a mixture of 95-60% by weight polyester resin and 5-40% by weight inorganic particles for the sheath. It is characterized by being at least part of the material.

  First, the core-sheath composite synthetic resin monofilament used for the lead wire of the present invention has a core-sheath composite structure, and the polyester resin constituting the sheath part needs to contain 5 to 40% by weight of inorganic powder. Furthermore, it is preferable that 10 to 20% by weight is contained.

  When the content of the inorganic powder in the sheath of the core-sheath composite synthetic resin monofilament is below the above range, the amount of powder protruding on the surface of the synthetic resin monofilament tends to decrease, and the effect of improving the lineability Since it cannot be obtained, it is not preferable. Conversely, when the content of the inorganic powder exceeds the above range, the strength of the synthetic resin monofilament tends to decrease, and the synthetic resin monofilament tends to break when the communication cable is led into the pipe, which is not preferable.

  In addition, in the case of a monofilament containing not more than 5-30% by weight of inorganic particles instead of a core-sheath composite structure, the inorganic particles are dispersed throughout the monofilament and the strength tends to decrease. In this case, the monofilament tends to break, which is not preferable.

  The polyester resin constituting the core-sheath composite synthetic resin monofilament of the present invention is not particularly limited. For example, polyethylene terephthalate, polybutylene terephthalate, polypropylene terephthalate, polymethylene terephthalate, polybutylene naphthalate, polymethylene naphthalate or these Examples include those obtained by copolymerization or blending of two or more types.

  Further, the polyester resin used in the present invention can contain other dicarboxylic acid components and diol components as long as the object of the present invention is not impaired. For example, as the dicarboxylic acid component, terephthalic acid can be used. , Isophthalic acid, phthalic acid, diphenyl dicarboxylic acid, diphenyl ether dicarboxylic acid, diphenyl sulfone dicarboxylic acid, benzophenone dicarboxylic acid, phenylindane dicarboxylic acid, oxalic acid, succinic acid, adipic acid, sebacic acid, cyclohexane dicarboxylic acid and decalin dicarboxylic acid Examples of the diol component include ethylene glycol, propylene glycol, tetramethylene glycol, pentamethylene glycol, hexamethylene glycol, octamethylene glycol, decamethylene glycol, Aliphatic glycols such as openylene glycol, cyclohexanediol, cyclohexanedimethanol, o-xylylene glycol, p-xylylene glycol, m-xylylene glycol, 1,4-bis (2-hydroxyethoxy) benzene, 1, 4-bis (2-hydroxyethoxyethoxy) benzene, 4,4′-bis (2-hydroxyethoxy) biphenyl, 4,4′-bis (2-hydroxyethoxyethoxy) biphenyl, 2,2-bis [4- ( 2-hydroxyethoxy) phenyl] propane, 2,2-bis [4- (2-hydroxyethoxyethoxy) phenyl] propane, 1,3-bis (2-hydroxyethoxy) benzene, 1,3-bis (2-hydroxy) Ethoxyethoxy) benzene, 1,2-bis (2-hydroxyeth B) benzene, 1,2-bis (2-hydroxyethoxyethoxy) benzene, 4,4′-bis (2-hydroxyethoxy) diphenyl sulfone, 4,4′-bis (2-hydroxyethoxyethoxy) diphenyl sulfone, etc. Aromatic glycols and hydroquinone, 2,2-bis (4-hydroxyphenyl) propane, resorcin, catechol, dihydroxynaphthalene, dihydroxybiphenyl, dihydroxydiphenylsulfone and the like can be mentioned.

  Here, the polyester resin constituting the core part and the polyester resin constituting the sheath part may be the same or different, but the core part and the sheath should be the same kind. It is preferable in terms of the bondability with the part.

  The inorganic particles contained in the sheath of the core-sheath composite synthetic resin monofilament include glass beads, titanium oxide, silicon oxide, aluminum oxide, calcium carbonate, magnesium carbonate, barium carbonate, barium sulfate, calcium sulfate, barium phosphate, lithium phosphate. , Calcium phosphate, magnesium phosphate, zirconia oxide, lithium fluoride, kaolin, and talc.

  The particle size of these inorganic particles is preferably in the range of # 46 to # 500 in the count indicated by the abrasive particle size JIS R6001. Preferably it is the range of # 80- # 180, More preferably, it is the range of # 100- # 120. If the particle size of the inorganic particles is less than # 500, there are few irregularities due to the inorganic particles on the surface of the monofilament, and the lineability tends to be inferior. Further, if it exceeds # 46, the monofilament surface is cracked and the strength tends to decrease, which is not preferable.

  In addition, the polyester resin constituting the core and sheath of the core-sheath composite synthetic resin monofilament includes a heat-resistant agent, a weather-resistant agent, a light-resistant agent, a hydrolysis-resistant agent, an anti-ultraviolet agent, an antioxidant, an anti-static agent, a smoothing agent. Known additive components such as agents, waxes, silicone oils, surfactants, dyes and pigments can be optionally added as necessary.

  Furthermore, the core / sheath part composite ratio of the core / sheath composite synthetic resin monofilament used for the lead wire of the present invention is 70 to 95/30 to 5, preferably by weight. If the ratio of the core part is less than the above range, it is not possible to expect a great improvement in the wireability, and if it exceeds the above range, the strength of the synthetic resin monofilament will be reduced, and communication into the pipe will occur. When guiding the cable, the synthetic resin monofilament tends to break, which is not preferable.

  The diameter of the synthetic resin monofilament used for the lead wire of the present invention can be appropriately selected according to the purpose of use of the lead wire, and is not particularly limited, but is preferably in the range of 1.0 to 2.5 mm. A range of 1.3 to 2.0 mm is more preferable.

  The lead wire of the present invention uses at least a part of the above-described core-sheath composite synthetic resin monofilament, but as shown in FIG. 1, a twist in which a plurality of the above-described core-sheath composite synthetic resin monofilaments 2 are twisted together. In the case of the lead wire 1 made of a wire, a particularly preferable effect is obtained.

  In the case of this stranded wire, at least one of the above-described core-sheath composite synthetic resin monofilaments can be used, and other normal monofilaments can be used. It is preferable to comprise a resin monofilament.

  In addition, the number of twists of the synthetic resin monofilament in the case of the lead wire 1 made of a stranded wire can be appropriately selected according to the purpose of use of the lead wire, and is not particularly limited. It is more preferably 26 to 58 turns / m, more preferably 34 to 48 turns / m, because the contact tends to be point contact and the frictional resistance tends to be reduced and the lineability tends to be improved. More preferred.

  The cross-sectional shape of the core-sheath composite synthetic resin monofilament used for the lead wire of the present invention is not particularly limited, but besides a circle, a polygon such as an ellipse, a triangle, a quadrangle, a pentagon, a star, a multileaf, etc. In addition, one core-sheath composite synthetic resin monofilament can be used by being twisted.

  In general, the diameter of the lead wire of the present invention is preferably about 10 to 40% of the pipe diameter. However, as described above, since the pipe diameter tends to be smaller in recent years, the lead wire is also made thinner. There is a need.

  However, if it is too thin, not only will the bending hardness of the lead wire be reduced, but it will also be difficult to transmit the force when pushing the lead wire into the pipe, so it may be difficult to pass through the wire. Since it becomes hard, it may be difficult to wire through the corners of the piping.

  Therefore, the diameter or circumscribed circle diameter of the lead wire of the present invention is preferably in the range of 2.0 to 3.5 mm, and more preferably in the range of 2.1 to 3.2 mm.

  Note that the lead wire is passed through a pre-laid pipe, and after connecting the electrical wiring and communication cables to the end of the lead wire, a large tension is applied to the lead wire when the lead wire is pulled out of the pipe. Therefore, it is preferable that the lead wire has a strength that can withstand this tension.

  Next, an example of the lead wire manufacturing method of the present invention will be described.

  The lead wire manufacturing method of the present invention does not require any special manufacturing apparatus, and can be manufactured by a known method.

  For example, a polyester resin as a core part, and a mixture of 95 to 60% by weight of a polyester resin as a sheath part and 5 to 40% by weight of inorganic particles are each supplied to two extruder-type composite spinning machines at 260 ° C. After being melt-kneaded at a temperature of 1, the core-sheath composite weight ratio is extruded from the core-sheath composite die hole. Then, after the extruded undrawn yarn is cooled and solidified at 60 to 90 ° C. while the surface of the cooling water tank is shaken, it is 4.0 to 8.5 times 1 at a heat medium temperature higher than the glass transition of the synthetic resin composition. First, a core-sheath composite synthetic resin monofilament is obtained by stretching in steps or two and then subjecting to a relaxation or constant length heat treatment of 0.85 to 1.0 times.

  The core-sheath composite synthetic resin monofilament thus obtained is then processed into a lead wire. In the present invention, the obtained core-sheath composite synthetic resin monofilament monofilament can be used as it is for the lead wire. .

  When a plurality of core-sheath composite synthetic resin monofilaments are twisted to be processed into a lead wire, for example, a plurality of core-sheath composite synthetic resin monofilaments are S twisted at a temperature equal to or higher than the glass transition point of the synthetic resin, or Z It can be obtained by twisting.

  The lead wire of the present invention thus obtained maintains a sufficient strength and durability when passing a linear object such as an electric wiring or communication cable into a pipe, and has a wire permeability higher than that of the conventional one. Therefore, its practicality is extremely high.

  Hereinafter, although the Example demonstrates the lead wire of this invention in more detail, this invention is not limited to a following example at all unless the main point is exceeded.

  In addition, evaluation of various characteristic values of the above and the following synthetic resin monofilaments and lead wire permeability was measured according to the following method.

[Diameter or circumscribed circle diameter]
Using a digital micrometer (manufactured by MITUTOYO), the diameter of the synthetic resin monofilament was measured at five locations along the fiber axis direction, and the average value was taken as the diameter or circumscribed circle diameter (mm).

[Line test]
A pipe (commercial product) having an inner diameter of 14 mm was formed as shown in FIG. 2, and the lead wire continuity when the lead wire was passed from A to B was evaluated in the following three stages. Further, the time required for the lead wires from A to B was also measured.
○: From A to B, it was possible to pass smoothly without being caught on the way,
△: Smoothly connected to more than half from A to B, but after that there was a place where it was caught on the way,
X: It was caught in the place which does not go to half from A to B.

In addition, the piping in each corner used the elbow for electric piping (commercial item), and the length of each linear part af was as follows.
a: 1.0 m
b: 1.0 m
c: 3.7 m
d: 11.0m
e: 3.7 m
f: 5.0m

[Examples 1 to 4]
Use a mixture of PET resin (T701T manufactured by Toray Industries, Inc.) for the core, PET (T701T manufactured by Toray Industries, Inc.) and the types and addition amounts of inorganic particles (Nitrek glass beads) shown in Table 1 for the sheath. Each was supplied to two extruder-type composite spinning machines, melted and kneaded at a temperature of 300 ° C., and then extruded from the core-sheath composite base hole at the core-sheath composite ratio shown in Table 1.

  The extruded undrawn yarn is cooled and solidified at 60 to 90 ° C. while shaking the surface of the cooling water tank, and then is stepped 4.0 to 8.5 times at a heat medium temperature higher than the glass transition of the PET resin. Alternatively, the core-sheath composite synthetic resin monofilament was first obtained by stretching in two stages and then subjecting to a relaxation or constant-length heat treatment of 0.85 to 1.0 times.

  Next, three core-sheath composite synthetic resin monofilaments obtained were aligned, twisted to a Z twist at 34 turns / m, and then heat-set in a dry heat bath, and the lead wire having a circumscribed circle diameter of 2.9 mm Manufactured.

  Table 1 shows the evaluation results of the obtained lead wires.

[Example 5]
Table 1 shows the evaluation results of the lead wires obtained in the same manner as in Example 1 except that the inorganic particles were changed to a particle size count # 60 of silicon carbide manufactured by Showa Denko.

[Comparative Example 1]
Table 1 shows the evaluation results of lead wires obtained in the same manner as in Example 1 except that the content of glass beads # 60, which are inorganic particles, was changed to 3% by weight.

[Comparative Example 2]
In Example 1, the content of glass beads # 60, which are inorganic particles, was changed to 50% by weight, and when spinning and drawing in the same manner, yarn breakage occurred during drawing, and a core-sheath composite monofilament could not be obtained. It was.

[Comparative Example 3]
The PET resin alone was subjected to a spinning machine, melted at a temperature of 300 ° C., and then extruded from the die hole. Then, the extruded undrawn yarn is cooled and solidified at 60 to 90 ° C. while shaking the surface of the cooling water tank, and then is stepped 4.0 to 8.5 times at a heat medium temperature higher than the glass transition of the synthetic resin composition. Alternatively, a synthetic resin monofilament was first obtained by stretching in two stages and then subjecting to a relaxation or constant length heat treatment of 0.85 to 1.0 times.

  Next, three of the obtained synthetic resin monofilaments were aligned, twisted to 34 turns / m in Z twist, and then heat-set in a dry heat bath to produce a lead wire having a circumscribed circle diameter of 2.9 mm. . Table 1 shows the evaluation results of the obtained lead wires. Is shown in Table 1.

  As can be seen from Table 1, the lead wire of the present invention has a sufficiently excellent wiring property.

  On the other hand, the lead wire that does not satisfy the conditions of the present invention, specifically, the lead wire having a content of inorganic particles of 3 wt. When the content is 50% by weight (Comparative Example 2), the core-sheath composite synthetic resin monofilament cannot be obtained due to yarn breakage caused by stretching during spinning, and a lead using a synthetic resin monofilament composed only of PET. The line (Comparative Example 3) was a result that the lineability was lower than that of the Example.

  Since the lead wire of the present invention has extremely low wiring resistance and can smoothly pass through the pipe, it is possible to efficiently wire electrical wiring and communication cables particularly in pipes that are becoming smaller in recent years. it can.

  In addition, the lead wire of the present invention can be used by adhering, fusing or crimping an electrical connection terminal to the terminal as required. Further, as a use other than the communication cable lead wire, a pull cord can be used. Can also be used.

It is the perspective view which showed an example of the lead wire of this invention. It is a top view of piping used for lineability evaluation in an example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Lead wire 2 Synthetic resin monofilament 3 Inorganic particle A Inlet of pipe for evaluation of wiring B Outlet of pipe for evaluation of wiring af The length (m) of each part of piping for evaluation of wiring

Claims (5)

A lead wire for wiring used when wiring a linear object in a pipe, a mixture of a polyester resin in a core part and a polyester resin of 95 to 60% by weight and inorganic particles in an amount of 5 to 40% by weight in a sheath part A lead wire for through-wiring, characterized in that a core-sheath composite structure synthetic resin monofilament is used as a constituent material. 2. The lead wire for wiring according to claim 1, wherein the core / sheath composite ratio of the core / sheath composite synthetic resin monofilament is in a range of 70 to 95/30 to 5 by weight ratio. The lead wire for wiring according to claim 1 or 2, wherein the particle size of the inorganic particles is in the range of # 46 to # 500 in the count indicated by the abrasive particle size JIS R6001. The lead wire for wiring according to any one of claims 1 to 3, wherein a plurality of monofilaments are twisted together using at least one core-sheath composite synthetic resin monofilament. The lead wire for through wires according to any one of claims 1 to 4, wherein a diameter or a circumscribed circle diameter is in a range of 2.0 to 3.5 mm.

Images