JPS60243611A - Wire rod carrying spiral spacer for communication and its manufacture - Google Patents

Abstract

PURPOSE:To obtain high adhesive strength by bringing a thermosetting resin into contact with a center core in an hardened stage, and executing its joining processing under pressure, when a spiral spacer is manufactured by using a fiber-reinforcing thermosetting resin hardened material for a tensile strength material of center core, and surrounding this outside periphery by a laminated body of thermosetting resin and high-density polyethylene. CONSTITUTION:A glass lobing 5 functioning as a strand of a spiral spacer is immersed in a liquid thermosetting resin 6 which becomes an intermediate layer, drawn out and passed through in a drawing die and used as a center core material. Subsequently, it is passed through in a crosshead die 8, and thereafter, its outside periphery is covered annularly with high-density polyethylene, and next, passed through a cooling layer and cooled, put into a hardening tank 9 and hardened at 140 deg.C by applying a pressure of 3.7kg/cm<2>. Thereafter, it is passed through in a die having a shaping die 10A and 10B, and an obtained strand 11 is wound around a bobbin 12, and used as the spiral space. In this way, the resin being the intermediate layer is brought into contact with the lobing 5 in an uncured state, cured at the time when it is passed through the drawing die 7, and their contact strength is raised in advance.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to the structure and manufacturing method of a helical spacer for protecting and supporting communication wires such as original fins.

For communication cables, cables are constructed by collecting a plurality of wires whose outer periphery is coated with silicone rubber, or core wires whose outer periphery is further covered, or both. There are many.

This original fiber cable is generally made of a separator that protects the optical fibers or cores and ensures a stable arrangement of sections, and a tensile strength that has the function of resisting external forces that act during installation or use. The wood and t are shining.

When such optical fibers are routed around curved sections, rolled up, or used in movable communication tags, a tensile strength material is placed as a core to make a cable, and the outer periphery is lined with longitudinal A spacer body with a plurality of spacer bodies having a parallel spiral structure running in the direction of the It is recommended that the main body of this spacer be made of thermoplastic resin.

In addition, metal wires, high-strength synthetic fibers, fiber-reinforced thermosetting resin cured* (hereinafter referred to as F'RP), etc. can be used as the core, but among these, F'RP using long glass fibers can be used.
It has particularly excellent properties in all its properties, such as its mass, high tensile strength, non-electrical conductivity, thermal expansion coefficient similar to that of the original phino, and flexibility.

However, even in this type of spacer, a satisfactory tensile shear bond strength between the core and the spacer body has not necessarily been achieved. In order to protect the spacer, it is necessary that the spacer has sufficient tensile strength, compressive strength, and stability against temperature changes.In particular, the tensile shear bonding strength or adhesive strength between the spacer body and the core must be sufficiently strong against environmental temperature changes. It must be durable enough. Based on the coefficient of thermal expansion of a normal thermoplastic resin material, if the temperature difference due to the rise and fall of outside temperature is 40 degrees Celsius, if the contact strength is not 60 degrees or more, bond interface failure will occur and the reinforcing material will be damaged. It becomes impossible to make full use of the features inserted. However, in the case where the conventional glass fiber-reinforced plastic core material is used as the core material and the spacer body is arranged after the core material is cured, the above-mentioned bonding force is weak, and a strength of up to 30 [M degrees] can be obtained at most.

If the adhesive strength between the separator body and the core is low, the spiral grooves will be displaced even during the cable production process in which the original fibers are arranged in a helical spacer, causing a phase shift with the original fibers and causing problems. There is a risk of causing trouble.
In addition, when the original fiber cable is installed and used, the separator body, which is made of thermoplastic resin with a coefficient of thermal expansion larger than that of the central core, acts independently due to changes in the temperature of the outside air, applying thermal stress to optical fiber A, and transmitting it by microbending. This may cause problems that affect the fundamentals of the transmission characteristics of optical fibers, such as increased loss.

In order to eliminate these drawbacks, the present inventor has created a thermoplastic resin spacer body with a tensile strength material (zF) LP as the center core and a plurality of continuous and mutually parallel spiral #l around the entire outer periphery. In the spiral spacer made of
As a result of intensive study on the adhesive strength between the RP and the spacer body and the method for manufacturing the same, we have hereby arrived at the present invention.That is, the spiral spacer and the method for manufacturing the same according to the present invention that achieve the above object. The gist is as stated in claims 1 and 2, respectively, but apart from this, as a product invention, the center core and the spacer body are not directly bonded to each other, but the center core and the spacer body are not directly bonded to each other. There is an intermediate layer made of a thermoplastic resin that is highly compatible with the spacer body, and the intermediate layer and the middle layer are interposed. L - Cutting force T fff The center core surface after hardening by pongee contact is made of a rough surface with an anchor effect having a tensile shear adhesive strength of at least 60 yen or more, and the intermediate layer and the spacer body are hardly connected. The spacer is characterized by having a completely fused layer structure.

The method invention also provides a method for manufacturing the spacer, which comprises forming the intermediate layer on the surface of an uncured FRP core material, cooling and solidifying it, and then heating the intermediate layer under pressure to form a core resin material. In this method, the above-mentioned spacer is manufactured by curing the core and the intermediate layer to bring about an extremely good adhesion state between the core and the intermediate layer, and then shaping and depositing a thermoplastic 1M resin material having high compatibility with the intermediate layer.

A more detailed supplementary explanation of this is as follows.

The spacer main body is not concerned about its dimensions, cross-sectional shape, and especially the depth of the groove, but the plurality of spiral shapes #I described above must be formed on the outer circumferential surface.

The material may be any thermoplastic resin that has full compression resistance to withstand external forces normally applied after cable installation, such as various types of nylon, homopolymers or combinations of polyethylene and polyzolopyrene, and various types of ABS. The diameter of the core is not limited to 9 to 9, depending on the required tensile strength, etc.
A required number of rovings made of glass fibers or aromatic polyamide fibers of about 13 microns are bundled together, and a mixture containing all of the unsaturated alkyd resin and polymerizable monomers such as styrene, that is, the unsaturated bo-17 ester resin, is Preferably, it is impregnated with an uncured thermosetting resin containing an oxide-based curing catalyst, etc., heated, and crosslinked and cured, but it is not necessarily limited to the above specifications. It's not something.

In addition, the intermediate layer material 11 is optimally of the same kind as the resin of the spacer body material, but it is not necessarily the same or identical as long as it has a similar solubility parameter so that it is difficult to separate the interface between the two, even if they are made of different noodles. It does not have to be a resin.

Particular attention should be paid to the fact that the resin composition of the core is hardened after the intermediate layer is carded, and the surface of the core is rougher than that of a material obtained by pultrusion molding the core material and then hardening it as is.

In general, cores produced by the so-called pultrusion method, which are formed by a drawing die and then passed through the mold and hardened, are
Although the surface of the core is smooth, the surface of the core as a member of the present invention is heated under pressure after being coated with the intermediate layer, and is formed under pressure and through a subsequent curing process, so that the surface of the core is smooth. It is rougher than the general core described above and has sufficient locking force for the intermediate layer. In addition, since the above method t is used, some of the polymerizable monomers such as styrene in the core material and the peroxide as a curing catalyst migrate into the intermediate layer or interact with the intermediate layer. It is also thought that the interface between the core and the intermediate layer has a somewhat crosslinked structure, but this has not necessarily been confirmed. In any case, the structure described above has much better adhesive strength than the conventional products described below.

Next, the method according to the present invention will be explained. The manufacturing method for this type of spacer involves impregnating glass fiber roving with a liquid uncured thermosetting resin made by adding a polymerizable monomer and, if necessary, a catalyst to an unsaturated alkyd resin.
It is customary to shape it into a predetermined size and shape using a 9-drawing die, insert it into a heated cylindrical mold to harden the surface to make it smooth, and then cover it with thermoplastic resin for the spacer body and mold it. . However, when this manufacturing method is used, it takes time to harden in the mold, so in order to increase the production speed, it is necessary to lengthen the mold, which has a trade-off such as increasing the resistance to take it out from the mold. contains problems.

In order to reduce this pulling resistance, the inner surface of the mold is finished with a mirror finish, so the surface of the core FRP produced by hardening with this mold is naturally smooth, and the outer periphery is covered with thermoplastic material for forming the spacer body. When coated with resin, the tensile shear adhesive strength between the core and the spacer body mainly depends on the shrinkage force of the thermoplastic resin when it is extruded to the outer periphery of the core FRP and solidified. However, in the method of the present invention, the core of FI'L P and the thermoplastic resin of the intermediate layer are bonded together without the core impregnated resin in order to obtain high contact strength. After being brought into contact during the curing stage, a bonding process is performed under pressure, and then a predetermined spacer shape is secondarily coated with a thermoplastic resin for forming the spacer body. That is, in a preferred embodiment of the present invention, a reinforcing fiber bundle is impregnated with liquid thermosetting resin, and the uncured material is formed into a predetermined size and shape using a drawing die, and the uncured material is passed through a rad die into the cloth to form the intermediate layer. The molding material is extruded and coated with a thermoplastic resin, and after cooling the machine part made of the thermoplastic resin, it is heated with steam or liquid heat medium under pressure to a temperature near the melting point of the thermoplastic resin. The thermosetting resin portion of the core is cured.

According to this method, the thermoplastic resin of the intermediate layer is heated to a temperature near the melting point of the thermoplastic resin when the uncured FRP that is the core material is cured, and moreover, The temperature becomes even higher due to the heat generated during curing of the core material resin, and the intermediate layer forming resin is bonded to the FRP part under pressure in a molten state, so the bonding is at least one that has a so-called anchor effect. It becomes extremely powerful.

The continuous thin rod-shaped molded product coated with the thermoplastic resin between the core FRP'kI411' layers obtained in this way does not necessarily have a uniform outer diameter, and has slight convexities due to the fuzz of the fibers in the FRP. If necessary, the surface of the intermediate layer coating is shaped to have a uniform outer diameter by inserting it into a shaping die with Pk dimensions and shape, and then rolled into an appropriate L bottle. It is preferable to take it and use it as a strand of a helical spacer.

Next, the wire of this spiral spacer is inserted into a cross having a circular through hole in the shaft part through a rad die, and while rotating a nozzle having an aperture with the desired cross-sectional shape provided around the through hole, A thermoplastic resin for forming the spacer body having the same or similar solubility/parameter as the coating resin for forming the intermediate layer of the strands is extruded to cover the core.This coating a is hereinafter referred to as the secondary coating. A spacer body is formed having a plurality of continuous spiral grooves having the desired dimensions and shape. The pitch of the spiral of the spacer body is determined relative to the take-up speed during secondary coating and the rotational speed of the nozzle.

The helical spacer according to the invention thus obtained is
In the process of forming the spacer wire, the adhesion between the nine FI'LP parts and the thermoplastic resin covering part formed on the intermediate layer is strong, and the thermoplastic resin for forming the spacer body is attached to the outer periphery of the wire. Since a spiral secondary coating is performed with resin, the intermediate layer of the wire outer sheath and the secondary coating are integrated by self-adhesion or fusion bonding in a molten state at the boundary between the two, resulting in the FRP part of the core The adhesion between the entire body of the spiral spacer and the thermoplastic resin coating remains strong.

Examples and comparative examples of the present invention will be described below.

Example 1 As the strands of a helical spacer, a glass roving 5 with a single fiber diameter of 13 microns was mixed with an unsaturated polyester resin (manufactured by Mitsui Toatsu Chemicals; Nyster H-8000) containing styrene as a polymerizable monomer and BPO. A liquid thermosetting resin 611-1 in which all two parts of the system catalyst were added and mixed was formed into a diameter of 2 mm using a drawing die 7 to obtain a core material which is the material of the core 1, and inserted into a crosshead die 8. High-density polyethylene (Mitsui Petrochemicals: Hi-Zex 6300) is used around the outer periphery of the core material.
M.

MIo, 1. (specific gravity: 0.952) is extruded into a ring shape with a thickness of 0.6 m, and is primarily covered with the intermediate layer 2. After cooling the entire layer through a cooling tank, it is heated to a vapor pressure of 3.7.
introduced into the cured layer 9 heated to 140°C and cured,
Furthermore, the outer surface portion of the coated intermediate layer was heated to 150° C. to soften it, and then shaped using shaping dies IOA and IOH, so that the glass content of the core FRP portion was 75% by weight.
A strand 11 for a spiral spacer with a core outer diameter of 2.0 fins and an outer diameter of 3.0 m after second coating was obtained. After this strand 11 was continuously supplied and wound onto a bobbin 2, , insert this into the cross RAD die] 3, rotate the nozzle 14 fully, and then apply the same high-density polyethylene as that used for the above-mentioned wire to the outer circumference of the wire at equal intervals with a thread diameter of 6.4 mm. , valley diameter 4. The spacer body had 6 Owg protrusions, was coated with a second layer so that the spiral pitch was 150, and was molded using three metals as shown in FIG.

The tensile shear adhesive strength of the spiral spacer 4 thus obtained was measured by the following method.
At a position 20 mm from one end of the long sample to be measured, a cutter knife was used to inscribe the entire thickness of the thermoplastic resin layer forming the spiral spacer body and the intermediate Ml, and then,
Extrude the same resin as the thermoplastic resin used to form the helical body sound into a sheet, and melt-bond it so that foot measuring grips of about 50 ts are formed on both sides of the sample, including about 18 mm at each end. . For the sample prepared in this manner, a tensile test was carried out in the longitudinal direction at a speed of 5 strips/minute, and the tensile shear adhesive strength for the aforementioned 20 strips was determined. The adhesion strength was measured by dividing the sum by n.The adhesion strength by this method of measurement was 144 times. 40〇- spiral spacer sample 1 in an atmosphere of ~30℃ and +60℃, respectively.
A heat cycle test was conducted in which the samples were left to stand for a total of 301 times.

As a result, no relative dimensional change was observed between the core FRP part and the covering thermoplastic resin layer on both end faces of the sample, and the adhesive strength when the sample was re-measured after this heat cycle test was 144 yen. There was no change at all, and it was confirmed that the adhesion between the core of this spiral spacer and the spacer body was not impaired even by the heat cycle test as described above.

Example 2 The same glass roving and thermosetting resin as in Example 1 were used, molded to a diameter of 1+w+ using a drawing die, and linear low-density polyethylene (Nippon Unicar, l!: Gl'
LSN-7047, MI 1.0. Specific gravity 0,918)
It was extruded to a thickness of 0.5 m to form a primary envelop, cooled and heated under the same conditions as in Example 1, and then shaped to form a helical spacer with an outer diameter of 2.8 mm. I met you. High-density polyethylene (manufactured by Showa Denko; Showa Rex 5300W) was applied to the outer periphery of this wire.

MI O, 30, specific gravity 0.949) was made into a secondary compound machine with four protrusions equally spaced with a peak diameter of 5.2 m and a valley diameter of 3.8 m, and the spiral pitch was 10010+. A spacer body was formed. The adhesive strength of the spiral spacer thus obtained was 106! M, and the same heat cycle test as in Example 1 was conducted, but no change in the adhesion state between the core FRP portion and the spacer body made of the thermoplastic resin was observed.

Example 3 As a reinforcing fiber, a thermosetting resin was used in which aromatic polyamide fiber (manufactured by DuPont: Kevler 49.1420 denier), unsaturated polyester resin (manufactured by Nippon Yubica; 3464), and the same catalyst as in Example 1 were all blended. impregnated with
It is formed into three outer diameters using a drawing die, and urethane-modified ABS resin (manufactured by Ube Saikon: 440.MI) is applied to the outer periphery.
1.5. Specific gravity 1,107) k After extruding into a ring shape with a thickness of 0.8 m and primary compounding, and cooling the coat,
The fiber content of the FRP part was 65 N and the outer diameter was 3. Otm, - A spiral spacer wire having an outer diameter of 4.6 tm after being coated was obtained. This strand is continuously supplied, and the same modified ABS resin as that used on the side of the primary plate is used on the outer periphery to form six protrusions with a peak diameter of 15 m, a valley diameter of 7 days, and a rib thickness of 2 strips at equal intervals. , and was secondarily welded so that the spiral pitch was 300 pitches. Core FRP of the obtained spiral spacer
The adhesive strength between the part and the spacer body was 152υ.

In addition, a heat cycle test was performed in the same manner as in the previous example, and as a result, the center core FFL at both ends of the sample was
There was no protrusion of P at all, and no decrease in the adhesive strength was observed.

Example 4 With the same configuration and conditions as Example 1, uncured medium core 1i'
After forming a temporary volume into a RP gold ring shape, the temporary volume is cooled and solidified,
Using pressurized water as a heating medium in the curing tank, the material was cured by heating at 140° C. under a pressure of 4 degrees. Thereafter, the thermoplastic resin of the second composite machine was shaped at 150° C. to obtain a strand for a spiral spacer with an outer diameter of 3 m. This strand is continuously supplied, and around its outer periphery, there are HDPE layers, which are the same as those of the first wire, at equal intervals with a thread diameter of 6.4 wm.
It has a valley diameter of 4, 6 protrusions of Ox, and a spiral pitch of]
The adhesive strength of this spiral spacer is that of 142, and even after the heat cycle test, the core PRP
No change in the adhesion state of the thermoplastic resin layer was observed.

Comparative Example 1 The same glass roving as in Example was impregnated with a thermosetting resin having the same composition as in Example 1, and formed into a diameter of 2 cm using a drawing die. It was passed through a cylindrical mold with a mirror finish, heated to 40 C using an infrared heater from the outside, and cured at a rate of 606 n/min, so that the glass content of the 1i'RP part was 75% by weight.
I made cum +W for a spiral spacer with an outer diameter of 2cm. This rope M
was continuously supplied, and the spacer main body was coated with the same resin as in Example 1 under the same conditions and in the same shape to obtain a spiral spacer. The adhesive strength between the center core FRP of this spiral spacer and the spacer body is only 30, and when the same heat cycle as in the previous example was repeated for 14 times, the FRP part protruded from both ends of the sample by 3.4 cm. .

The pitch of the spiral was also disordered.

Comparative Example 2 Core FRP was cured under the same conditions as Comparative Example 1.
Intermediate layer and spacer body A spiral spacer coated under the same conditions and shape as in Example 1 was obtained.

The adhesive strength of this spiral spacer is only 25 yen, and both ends of the sample after the heat cycle test are F
The RP jumped out by about 3.7 ms, and the pitch of the spiral was also disordered.

The composition of each material and dimension of the above Examples and Comparative Examples, the adhesive strength and heat cycle test results measured by the above method, and the tensile test was conducted on 150 samples with a sample length of 5 samples per minute. Table 1 summarizes the tensile strength and tensile modulus based on the results.

Although the examples and comparative examples have been explained above, the center core FR
The thermoplastic resin used for the primary coating and the secondary coating of P may be selected depending on the compressive strength required for the spacer body of the spiral spacer, and the above-mentioned adhesive strength between the primary coating and the secondary coating. In order to increase the resistance, it is desirable to use the same or the same type of resin, but materials with different polarities may be used as long as the chemical adhesion between the two wave S resins is good.

That is, the present invention is formed by forming a core FRP part with a thermoplastic resin that forms an intermediate layer, and applying a circular secondary coating to the outer periphery of the wood wire. It consists of a bonding structure with the spacer body, but the center core is made of FRP.
The adhesion strength between the spiral part and the spiral part made of thermoplastic resin which is the spacer body is determined by the fusion adhesion between the secondary coating layer and the secondary coating layer and the fluidity of both the surface of the core 1' R, P and the intermediate layer. It is expressed through the rough surface boundary layer formed by pressure bonding while in the state, and the above-mentioned contact-N structure and the above-mentioned process for fully expressing it are important features of the structure of the invention.

Next, the relationship between the adhesiveness and curing conditions of the core FRP and the primary coating thermoplastic resin will be further explained based on experimental results. The experiment was conducted in the following manner.

In other words, after first cutting an uncured core FRP with a thermoplastic resin, the material is cooled and solidified, and then introduced into a curing tank and heated to harden.1. The adhesive strength of various samples cured by changing the temperature to f' was measured.

More specifically, as a reinforcing fiber, a glass roving with a single fiber diameter of 3 microns is coated with an unsaturated polyester resin containing an unsaturated alkyd resin and styrene as polymerizable monomers.
After impregnating a thermosetting resin made by adding 2 parts of a peroxide catalyst to Nistar H-8000 (manufactured by Mitsui Toatsu Chemical Co., Ltd.), it is squeezed using a die to obtain an outer diameter of 2 mm and a glass content of 7 mm.
It is formed into an uncured thin rod of 5 weight, and then inserted into a cross through a RAD die to form a linear low-density polyethylene (hereinafter referred to as L).
It is called LDPE. ) (Made by Nippon Unicar = OR8N-7
047, MI 1.0. ratio X O,918) and thickness 1m
After being coated in an annular shape, the coated portion was solidified by water cooling, and then introduced into a curing tank in which the pressure and temperature were varied using steam, pressurized water, and silicone oil as heating media, and heat-cured. The adhesion strength of each sample was measured using the following method.

First, 20 m from one end of the measurement sample with a length of 200 strips.
At the position shown in FIG.
The results of this experiment regarding curing conditions and adhesive strength are shown in Table 2.

Table 2 Looking at the relationship between curing conditions and adhesive strength from Table 2, the maximum adhesive strength was obtained at 140°C and 150°C when steam was used as the heat medium. In experiments using steam as a heat medium, in order to change the temperature, the steam pressure is necessarily changed, so it is not possible to know from the caustic line alone whether temperature or pressure has a greater effect on bond strength. When silicone oil is heated to -140°C and cured under normal pressure, styrene (polymerizable monomer) vaporizes and breaks the softened LLDPB coating, resulting in not only a markedly poor shape but also hardening. The resulting FRP also becomes porous and its physical properties such as tensile strength at break and tensile modulus of elasticity deteriorate, making it unusable as a wire for a helical spacer.

However, compared to this, using pressurized water as a heating medium,
When cured at 140°C under the pressure of M, the shape is good and the adhesive strength is close to the value obtained at 140°C with steam. From this, the pressure applied during the curing process prevents styrene (polymerizable monomer) from vaporizing during curing, and both the uncured core 'i;'fLp and the thermoplastic resin are heated in a fluid state. It is believed that by making pressure contact, this contact state is maintained or promoted even while the thermosetting reaction of the uncured FRP layer is progressing, and is useful for realizing an anchor effective contact structure.

Both the core FRP surface and the intermediate layer are #t! ill
! The shape of the boundary node unique to the present invention formed by compression while in the I state is obtained on the central FRP surface of the fc helical spacer or the helical spacer strand. ! -Also confirmed by observation. That is, in order to compare the surface shape of the core material used in the present invention and the surface shape of the core material of Comparative Example 1, the surface of each core was observed using an electron micrograph taken at a magnification of 100 times. The surface of the core FRP according to the present invention has a significantly roughened surface compared to that of conventional general pultrusion molded products, and this roughened surface provides sufficient locking force to the thermoplastic resin of the intermediate layer. Note that the samples used for this observation were obtained by immersing each of the above-mentioned helical spacers in a xylene solution to dissolve only the thermoplastic resin layer. It was obtained by exposing the part.

Generally speaking, when a thermoplastic resin with high hardness is used, the adhesive strength decreases, probably because the energy required to deform the uneven interface exhibiting an anchor-effective contact structure is large. Therefore, it is preferable to select all resin materials in consideration of this point and the anti-compressive force of the spacer body.

Although not essential, the core Fki and P'N5 of the casing are first coated with a thermoplastic resin, and after curing, the surface of the outer layer is shaped to equalize the outer diameter, and then the wire is When doing so, the disadvantage of not performing this shaping is that due to the non-uniform outer diameter, the center core FRP part is not placed in the center during the secondary coating to form the spacer body, resulting in misalignment. It is possible to prevent the phenomenon in which the core gets caught in the through-hole guide, which makes the operation unsmooth, and the final shape of the helical spacer becomes uneven. The helical spacer has an extremely strong adhesion between the core FRP part as a tensile strength member and the spiral spacer part made of thermoplastic resin, so it is difficult to use during the cable production process in which optical fibers are arranged in a spiral groove or during the installation after cable production. In addition, it has extremely high reliability to fully demonstrate the function of protecting and supporting the optical fibers in the usage state after installation, and is suitable for fields that require non-metallic properties and for flexible applications such as movable communication slips. Spiral thread for supporting communication wires in required fields

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing an embodiment of a helical spacer according to the invention, FIG. 2 is a perspective view of the spacer, FIG. 3 is a method of manufacturing a strand for a helical spacer according to the invention, and FIG. 1A and 1B are schematic diagrams illustrating one embodiment of the method for manufacturing a helical spacer according to the invention, respectively; FIG. DESCRIPTION OF SYMBOLS 1... Core, 2... Middle layer, 3... Spacer body, 4... Spiral spacer, 5... Roving, 6...
・Thermosetting resin, 7...Drawing 9 dies, 8...Cross to rad die, 9...Hard cypress, IOA, B...Shaping die, 11...Element wire, 12...・Zevin, 13...
・Crosshead die, 14... Nozzle Fig. 1 Peng Fig. 2

Claims (2)

[Claims] (1) A thin rod-shaped core made of a cured fiber-reinforced thermosetting resin, an intermediate layer made of a thermoplastic resin surrounding this core, and an outer periphery made of a thermoplastic resin with high compatibility with this intermediate layer. a plurality of spiral grooves tI extending longitudinally and parallel to each other;
The spacer body which has been formed is joined together, the inner circumference of the spacer body and the outer circumference of the intermediate layer are fused, and the boundary between the circumference of the intermediate layer and the outer circumference of the center core is at least in contact with the anchor due to pressure downstream of the two. #A spiral spacer for supporting a communication wire, characterized by having an M structure. (2) Thin rod-shaped core material made of reinforcing fiber bundles impregnated with uncured thermosetting resin, removed with molten thermoplastic resin, cooled to completely assimilate the thermoplastic AT fat, and then After heating under pressure in a curing chamber to harden the uncured resin in the core and bring the core and thermoplastic resin into close contact to obtain a reinforcing wire, the outer peripheral surface of the wire is heated. Item 1, characterized in that a molten thermoplastic resin material having high compatibility with the thermoplastic resin is molded to form a plurality of parallel spiral grooves running in the longitudinal direction of the strands. A method for manufacturing a spiral spacer for supporting communication wires.