WO2005047950A1 - ドロップ光ファイバケーブルおよび同ケーブルに使用するfrp製抗張力体 - Google Patents
ドロップ光ファイバケーブルおよび同ケーブルに使用するfrp製抗張力体 Download PDFInfo
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- WO2005047950A1 WO2005047950A1 PCT/JP2004/006188 JP2004006188W WO2005047950A1 WO 2005047950 A1 WO2005047950 A1 WO 2005047950A1 JP 2004006188 W JP2004006188 W JP 2004006188W WO 2005047950 A1 WO2005047950 A1 WO 2005047950A1
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- tensile strength
- optical fiber
- strength member
- frp
- coated
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Classifications
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/44—Mechanical structures for providing tensile strength and external protection for fibres, e.g. optical transmission cables
- G02B6/4401—Optical cables
- G02B6/4429—Means specially adapted for strengthening or protecting the cables
- G02B6/443—Protective covering
- G02B6/4432—Protective covering with fibre reinforcements
- G02B6/4433—Double reinforcement laying in straight line with optical transmission element
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/44—Mechanical structures for providing tensile strength and external protection for fibres, e.g. optical transmission cables
- G02B6/4401—Optical cables
- G02B6/4429—Means specially adapted for strengthening or protecting the cables
- G02B6/4434—Central member to take up tensile loads
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/44—Mechanical structures for providing tensile strength and external protection for fibres, e.g. optical transmission cables
- G02B6/4479—Manufacturing methods of optical cables
- G02B6/4489—Manufacturing methods of optical cables of central supporting members of lobe structure
Definitions
- the present invention relates to a drop optical fiber cable and a FRP tensile strength member used for the cable, and more particularly to a non-metallic drop optical fiber cable that is lightweight, can be reduced in diameter, and is suitable as a drop wire, and The present invention relates to an FRP tensile strength member suitable for a non-metallic drop optical fiber cable.
- a wire made of fiber reinforced synthetic resin can be used, but instead of a metal wire tensile strength material, simply use an FRP wire.
- FRP fiber reinforced synthetic resin
- an uncured reinforcing core obtained by impregnating a hardened fiber bundle with an uncured thermosetting resin is coated with a molten thermoplastic resin, and immediately thereafter, a coating layer of the thermoplastic resin is formed. After being cooled and solidified, it is led to a pressurized high-temperature steam curing tank, where the interface between the reinforcing core and the coating layer is softened. Then, the coated thermoplastic resin is cooled to anchor the core interface made of fiber reinforced thermosetting resin (FRP) to the coated thermoplastic resin.
- FRP fiber reinforced thermosetting resin
- the FRP tensile strength material used for this type of drop optical fiber cable has a technical problem that it is easily broken with a large bending diameter compared to a metal cable, resulting in breakage.
- the FRP diameter may be reduced, but when the reinforcing fiber is the same, the problem is that the tensile strength decreases.
- the improvement in tensile strength alone can be solved by replacing the reinforcing fiber with a high-strength, high-elastic modulus type.
- the function of suppressing the shrinkage of the resin that constitutes the main body due to changes in the environmental temperature (anti-shrinkage) ) Is required, so as a means to reduce the contact area with the main body resin (the anti-shrinkage property becomes difficult to function), it is not preferable to reduce the diameter, it is almost the same diameter as the conventional one, and the bending radius is small.
- the need for FRP strength members was required.
- the present invention has been made in view of such a conventional problem, and an optical fiber core wire and a fiber-reinforced thermosetting resin (hereinafter, sometimes referred to as FRP) tensile strength member are made of a thermoplastic resin.
- the primary object of the present invention is to obtain a non-metallic drop optical fiber cable that is particularly lightweight, can be made thinner, and has suitable properties as a drop wire, in a batch-coated optical fiber cable.
- Another object of the present invention is to provide an FRP tensile strength member which does not easily break at a large bending diameter. Disclosure of the invention
- the present invention provides a coated tensile strength body in which a coating layer made of a thermoplastic resin is applied to a tensile strength body of a fiber-reinforced thermosetting resin, an optical fiber core, and the coated tensile strength body. And a main body covering portion covering the optical fiber core wire with a thermoplastic resin at a time, wherein the outer periphery of the coated strength member and the main body covering portion are fused and bonded to each other.
- the inner periphery of the coating layer and the outer periphery of the strength member were anchor-bonded.
- the coated strength member may be formed by applying the coating layer having a diameter of 0.3 mm or less to the strength member having a glass fiber as a reinforcing fiber and having an outer diameter of 0.9 mm or less.
- LLDPE can be used for the covering layer made of the thermoplastic resin of the covering strength member.
- the coated tensile strength member can have a drawing force of 1 ONZ l O mm or more. Two of the coated tensile members can be arranged at predetermined intervals above and below the optical fiber core wire.
- the strength member may use glass yarn as the reinforcing fiber.
- glass yarn a single yarn having a single fiber diameter of 3 to 13 ⁇ m and a plurality of yarns not twisted can be used.
- the present invention provides a tensile strength member made of FRP in which the reinforcing fibers are bound with a thermosetting resin, wherein the tensile elastic modulus of the reinforcing fibers is not less than 360 cN / dtex, and the elongation at break is Degree increased to 3.5% or more.
- the thermosetting resin may be a bielester resin.
- the FRP tensile strength member includes a coated tensile strength member having a coating layer made of a thermoplastic resin on an outer periphery thereof, and a main body covering portion that collectively covers the optical fiber core and the coated tensile strength member with a thermoplastic resin. The outer periphery of the coating layer and the body covering portion are fused and bonded to each other, and the inner periphery of the coating layer and the outer periphery of the strength member can be anchor-bonded.
- the tensile strength member made of FRP is formed in a flat cross section such as an ellipse or a rectangle, and can be arranged so as to have a smaller thickness in a bending direction when the drop optical fiber cable is laid.
- FIG. 1 is a sectional view showing one embodiment of a drop optical fiber cable according to the present invention.
- FIG. 2 is an explanatory diagram of a method for measuring the pull-out (adhesion) force of the coated tensile strength member used for the drop optical fiber cable of the present invention.
- FIG. 3 is an explanatory view of an ironing test of the drop optical fiber cable of the present invention.
- FIG. 4 is a cross-sectional view showing an example of an FRP tensile strength member according to the present invention and a drop optical fiber cable using the same.
- FIG. 5 is an explanatory diagram when the drop optical fiber cable shown in FIG. 4 is laid.
- FIG. 6 is an explanatory view of a base used when forming the main body cover of the drop optical fiber cable shown in FIG.
- FIG. 7 is a cross-sectional view showing another example of the FRP strength member according to the present invention and a drop optical fiber cable using the same.
- FIG. 8 is an explanatory diagram for confirming the bending layability of the drop optical fiber cable according to the present invention.
- FIG. 1 shows an embodiment of a drop optical fiber cable according to the present invention.
- the drop optical fiber cable 1 shown in FIG. 1 includes optical fiber cores 2 and 3, a coated tensile member 6, and a support wire 7 (also referred to as a messenger wire).
- the optical fiber cores 2 and 3 are arranged vertically adjacent to the center.
- the coated tensile member 6 is formed of a fiber-reinforced thermosetting resin (FRP) tensile member 4 in a circular cross-section covered with a thermoplastic resin coating layer 5, and has a pair of coated tensile members. 6 are coaxially arranged at predetermined intervals above and below the optical fiber cores 2 and 3 so as to sandwich the core.
- FRP fiber-reinforced thermosetting resin
- the supporting wire 7 is disposed above one of the coated tensile strength members 6, and the optical fiber core wires 2 and 3, the coated tensile strength member 6 and the supporting wire 7 are collectively covered by a main body covering portion 8 made of a thermoplastic resin. It has a configuration.
- the support wire 7 is connected via a narrow portion 10 so as to be separated from other portions.
- the drop optical fiber cable 1 configured as described above is installed between telephone poles by using the support wire 7, and when the optical fiber cable 1 is pulled into the subscriber's house, the narrow width portion 10 is first cut to support the optical fiber cable.
- the wire ⁇ is separated, then cut off from the notch 9, the optical fiber cores 2 and 3 are taken out, and the subscriber side and the cores 2 and 3 are connected.
- the coated tensile strength member 6 is obtained by applying a coating layer 5 made of a thermoplastic resin to a tensile strength member 4 made of a fiber-reinforced thermosetting resin (made of FRP). In this case, the outer periphery of the FRP tensile strength member 4 and the inner periphery of the coating layer 5 are mutually anchored.
- JP-B-63-27772 that is, an uncured reinforcing core obtained by impregnating an uncured thermosetting resin into a reinforcing fiber bundle is used.
- the thermoplastic resin coating layer is cooled and solidified immediately after that, and then guided to a pressurized high-temperature steam curing tank, where the interface between the reinforcing core and the coating layer is softened, and the fluidized state is obtained.
- the thermosetting resin is heated and cured during the contact, and then the coated thermoplastic resin is cooled to anchor the interface between the core made of fiber reinforced thermosetting resin (FRP) and the coated thermoplastic resin. You can do it.
- FRP fiber reinforced thermosetting resin
- reinforcing fiber that can be used in the present invention, various glass fibers, aromatic polyamide fibers, carbon fibers, and the like are generally used, and are selected according to required tensile strength and elastic modulus.
- glass fiber in order to reduce the diameter of the FRP tensile strength member 4 to 0.9 mm or less, glass yarn is preferable, and glass fibers such as E, S, and T are required. It is selected depending on the performance, but ⁇ ⁇ glass is recommended for economy.
- a single fiber having a single fiber diameter of 3 to 13 m and a plurality of yarns that are not twisted is desirable, and 11.2 to 67.5 Tex is used. .
- the reason for selecting glass yarn is that the yarn is twisted, for example, with one Z-inch, so that the thermosetting resin is impregnated or drawn. This is because a non-stretched rod-like material having a uniform perimeter with little disturbance, loosening, or entanglement of the glass single fiber can be obtained.
- the volume content of the glass fiber of the tensile strength member 4 is determined by the required physical properties, but in the present invention for the purpose of further reducing the diameter, it is preferably about 60 to 70 VOL%.
- thermosetting resin that can be used in the present invention is generally a terephthalic acid-based or isophtalic acid-based unsaturated polyester resin, a butyl ester resin, an epoxy resin, or the like, and a curing catalyst or the like is added thereto. Used.
- thermoplastic resin used for the coating layer 5 of the uncured reinforcing core portion is selected from resins compatible with the thermoplastic resin of the main body coating portion 8, and when a flame retardant resin is used for the main body coating portion 8, In order to improve the compatibility with the resin, it is preferable to use an adhesive resin or to add a master batch of the adhesive resin, and further add a coloring master patch according to the color of the main body covering portion 8. May be colored.
- thermoplastic resin used for the coating layer 5 may have been subjected to various modifications for imparting flame retardancy in accordance with the flame retardation of the main body coating portion 8. Further, the thermoplastic resin used for the coating layer 5 preferably has a molten or softened state at least at the inner periphery when the thermosetting resin is cured by heating in order to obtain an anchor bonding structure with the FRP tensile strength member 4. Polyolefin resins having a melting point or softening point in the curing temperature range of 110 to 150 ° C. are more preferred.
- the coated tensile strength member 6 is desirably a cured fiber-reinforced thermosetting resin having an outer diameter of 0.9 mm or less from the viewpoint of bending resistance and reduction in diameter.
- the coating thickness more than necessary will be a factor inhibiting flame retardancy, so the thickness of the coating layer 5 should be 0.3 mm or less. Is desirable.
- the thickness of the coating layer 5 be about 0.07 mm after shaping for the purpose of reducing the diameter.
- a resin having good thin film moldability is desirable.
- low-density polyethylene (LDPE), linear low-density polyethylene (L LDPE) and the like are preferable.
- LLDPE low density polyethylene
- JISK 6 7 6 0 MF R force S l ⁇ 4 g Z l 0 min tensile by density 0. 9 2 0 ⁇ 0. 9 4 0 g / cm 3, JISZ 1 7 0 2
- the tensile strength is 30 MPa or more
- the 1% modulus has a value in the range of 150 to 250 MPa.
- the tensile strength of the tensile strength member 4 from the thermoplastic resin used for the coating layer 5 is 10 N / 1 Omm or more.
- This pull-out force is used as an index of the adhesion force by the anchor bonding structure, and was measured by the following measurement method.
- the coating layer 5 at the end of the coated tensile strength member 6 was peeled off, and then continuously.
- the coating layer 5 was scribed with a length of 1 O mm using a force razor blade to prepare a sample S having the coating layer 5 having a length of 10 mm.
- the sample S was passed through the through hole of the tester, a tensile load was applied at a speed of 50 mm / min, and the pulling force was obtained from the chart.
- FIG. 4 and FIG. 5 show one embodiment of the FRP strength member and the drop optical fiber cable using the strength member according to the present invention.
- the drop optical fiber cable 1a shown in these figures includes an optical fiber core 2a, a coated tensile member 6a, and a support wire (messenger wire) 7a.
- the coated tensile strength member 6a is formed in a flat rectangular cross section in which a tensile strength member 4a made of fiber reinforced thermosetting resin is covered with a coating layer 5a made of thermoplastic resin, and a pair of coated tensile strength members 6a is formed. Are placed coaxially at predetermined intervals above and below the optical fiber core wire 2a and sandwich it. Yes.
- the support wire 7a is disposed above one of the coated tensile strength members 6a, and the optical fiber core wire 2a, the coated tensile strength member 6a, and the support wire 7a are covered with a main body covering portion 8 made of thermoplastic resin. It is provided with a configuration that is collectively covered with a. A pair of notches 9a are formed on the main body covering portion 8a so as to face each other on both sides of the optical fiber core 2a.
- a circular body covering portion 8a is provided on the outer periphery of the support wire 7a, and the support wire 7a is connected by a narrow portion 10a so as to be separated from other portions. Have been.
- the drop optical fiber cable 1a configured as described above is installed between telephone poles using the support wire 7a, and when drawing into the subscriber's house, first, as shown in FIG. 10a is cut to separate the support wire ⁇ a, then cut off from the notch 9a, take out the optical fiber core 2a, and connect the subscriber side and the core 2a. Will be connected.
- the coated tensile strength member 6a is obtained by applying a coating layer 5a made of a thermoplastic resin to a tensile strength member 4a made of a fiber-reinforced thermosetting resin (hereinafter referred to as FRP).
- the reinforcing fiber of the tensile strength member 4a for example, aramid fiber, polyarylate fiber, polyparaphenylene benzobisoxazole (PBO) fiber, etc., have a tensile modulus of 36%.
- a material having an elongation at break of not less than 0 cN / dteX and an elongation of not less than 3.5% is appropriately selected.
- the tensile elastic modulus is less than 360 cN / dtex, sufficient tensile strength for protecting the optical fiber core wire 2a cannot be obtained, and thus it cannot play its role.
- the FRP becomes difficult to bend, and it becomes difficult to reduce the bending radius when a drop optical fiber cable is formed.
- the continuous use allowable bending radius increases, and it is necessary to lay with a large bending radius when laying.
- the more preferable tensile modulus is 480 cN / dteX or more.
- the reinforcing fiber used is preferably a so-called multifilament having a single fiber diameter of 10 to 15 ⁇ m and not twisting a plurality of yarns, and is preferably 500 to 350 dtex. used.
- thermosetting resin that can be used for binding the reinforcing fiber of the present invention is generally a terephthalic acid-based or isophthalic acid-based unsaturated polyester resin, a vinyl ester resin (such as an epoxy acrylate resin), or an epoxy resin.
- a curing catalyst or the like is added to these, and a butyl ester resin (such as an epoxy acrylate resin) is particularly preferred in view of physical properties such as heat resistance.
- thermoplastic resin used for the coating layer 5a of the uncured reinforcing core portion is selected from resins compatible with the thermoplastic resin of the main body covering portion 8a, and a flame-retardant resin is used for the main body covering portion 8a.
- a flame-retardant resin is used for the main body covering portion 8a.
- thermoplastic resin used for the coating layer 5a may have been subjected to various modifications for imparting flame retardancy in accordance with the flame retardation of the main body coating portion 8a.
- thermoplastic resin used for the coating layer 5a preferably has a molten or softened state at least at the inner periphery when the thermosetting resin is cured by heating in order to obtain an anchor bonding structure with the FRP portion.
- Polyolefin resins having a melting point or softening point in the temperature range of 110 to 150 ° C. are more preferred.
- a cured fiber-reinforced thermosetting resin having an outer diameter of 0.9 mm or less from the viewpoint of bending resistance and reduction in diameter (more preferably). Is 0.6 mm or less).
- the flame-retardant property is not given to the coating layer 5a and the flame-retardant property is required for the Since the thickness is a hindrance to flame retardancy, it is desirable that the thickness of the coating layer 5a is 0.3 mm or less.
- the thickness of the coating layer 5a is preferably not less than 0.08 mm before the diameter adjustment.
- the diameter of the surface layer is adjusted from 0.07 to 0.2 by adjusting the diameter of the surface layer to reduce the diameter. More preferably, the thickness is about mm.
- a resin having good thin film moldability is desirable.
- LD PE low density polyethylene
- L LD PE linear low density polyethylene
- etc. are suitable. .
- the shape of the FRP coated tensile strength member 6a of the present invention is not particularly limited, but is formed in a flat cross section such as an ellipse or a rectangle.
- the bending direction in FIG. 4, (Vertical direction)
- the bending radius can be made smaller and the layability can be further improved by arranging the thickness of the FRP tensile strength member 3 small (see FIGS. 4 and 5).
- FIG. 6 shows another embodiment of the FRP tensile strength member according to the present invention and the optical fiber cable with a front end using the same, and the same or corresponding portions as those in the above-described embodiment include: The description is omitted with the same numeral attached, and only the characteristic points are described in detail below.
- the drop optical fiber cable 1b shown in the figure includes an optical fiber core 2b, a coated tensile member 6b, and a support wire 7b.
- the coated tensile strength member 6b is formed in a circular cross section in which a tensile strength member 4b made of fiber reinforced thermosetting resin is covered with a coating layer 5b made of thermoplastic resin. A predetermined distance above and below the optical fiber core 2b Is placed on the same axis so as to sandwich it.
- the support wire 7b is disposed above one of the coated tensile strength members 6b, and the optical fiber core wire 2b, the coated tensile strength member 6b and the support wire 7b are covered with a main body covering portion 8 made of thermoplastic resin. It has a configuration that is collectively covered with b. A pair of notches 9b are formed on the main body covering portion 8b so as to face each other on both sides of the optical fiber core wire 2b.
- a circular body covering portion 8b is provided on the outer periphery of the support wire 7b, and the support wire 7b is connected by a narrow portion 10b so as to be separated from other portions.
- Such a configuration is substantially the same as the above-described embodiment.
- Examples of the reinforcing fiber of the tensile strength member 4b include, for example, aramid fiber, polyarylate fiber, and polyparaphenylenebenzobisoxazonole (PBO) fiber having a tensile modulus of 360%.
- aramid fiber polyarylate fiber
- PBO polyparaphenylenebenzobisoxazonole
- the rod was passed through a cross extruder (200 ° C) of a melt extruder, and MI with a black master batch added was 2.4.
- LLDPE resin with a density of 0.921 g / cm 3 and a cast finolem of 30 / _im having a 1% modulus of 170 MPa (manufactured by Nippon Tunica: TUF206 ), The annular thickness is 0.21 mm
- the coated uncured linear material was introduced into a pressurized steam curing tank provided with pressure seals at the inlet and outlet, and was cured at a vapor pressure of 23.5 Pa.
- shaper having a shaping die has been heated inside diameter 0. 9 3 mm and 0. 7 0 m m a C shape the coated outer circumferential surface, to obtain a coating strength members 6 of the covering outside diameter 0. 7 mm Then, it was wound continuously on the bobbin.
- the coated tensile strength member 6 had a glass fiber content of 63.5 VOL%, and the pull-out force measured using the measuring jig 11 shown in FIG. Met.
- a 24 hour heat-resistant bend diameter test at 80 ° C heat 30 mm was cleared, and a heat cycle of 130 ° C to 80 ° C was performed with a sample length of 100 mm. The test was repeated three times, and the adhesion between the coating layer 5 of the coated tensile strength member 6 and the tensile strength member 4 was checked. However, the shrinkage of the coating layer 5 hardly occurred.
- a drop optical fiber cable 1 having the configuration shown in FIG. 1 was manufactured by the following method.
- the support wire ⁇ use a steel wire with an outer diameter of 1.2 mm, optical fiber core wires 2, 3 with a diameter of 0.25 mm, and two coated tensile strength members 6, and arrange them at predetermined intervals. This was passed through a cross-head die to form a main body covering portion 8 with a flame-retardant polyethylene resin, and a dope optical fiber cable 1 having a notch 9 at the center was obtained.
- the ironing characteristics of the obtained drop optical fiber cable 1 were measured using an ironing tester of a measuring system shown in FIG.
- 1 is a drop optical fiber cable to be tested
- 12, 13, and 14 are traction strings
- 15 is a bent pipe that passes through the optical fiber cable 1
- R It is bent at a curvature of 300 mm.
- Reference numeral 16 denotes a weight for applying a predetermined load to the optical fiber cable 1 via the traction string 12.
- a heat cycle of 30 ° C to + 80 ° C was repeated five times under a load of 34.3 N, ironing length lm, and temperature conditions, and a light source with a wavelength of 1550 nm was used.
- the measurement results are summarized in Table 2 below.
- Example 1 the steam pressure in the pressurized steam curing tank was set to 15.7 Pa (Specific Example 2) and 32.4 Pa (Specific Example 3), and the temperature in the curing tank was set to 125 ° C and 1 ° C. Except for curing at 45 ° C, a coated tensile strength wire was obtained in the same manner as in Example 1.
- the pull-out force of the obtained coated tensile strength wire was 11.3 (Specific Example 2) and 15 N / l O mm (Specific Example 3), and the heat-resistant bending diameter test was performed at 80 ° C for 24 hours. All of them cleared 30 mm.
- a drop optical fiber cable was produced in the same manner as in Example 1 using the coated tensile strength wires of Examples 2 and 3, but there was no increase in transmission loss in the ironing test of the obtained drop optical fiber cable, and the heat cycle test was performed. No increase in transmission loss was observed. Comparative Example 1
- Example 1 a coated tensile strength body was obtained in the same manner as in Example 1, except that the curing pressure was set to 8.8 Pa and the temperature in the curing tank was set to 115 ° C. .
- the pull-out force of the obtained coated tensile strength material is 7 NZ10 mm, and in the 24-hour heat-resistant bending test at 80 ° C with a diameter of 30 mm, all the samples break and the diameter of 30 mm cannot be cleared. Did not. Comparative Example 2
- Example 1 the density of 0.928 gZ cm 3 , MFR 1.3 gZ l O min, tensile strength Using LLDPE resin (NUCG-5350, manufactured by Nihonika) with a coating thickness of 0.21 mm in a ring shape with a thickness of 0.2 mm using an 18 Mpa, l% modulus, 34 Then, the coating on the surface was cooled and solidified.
- LLDPE resin NUCG-5350, manufactured by Nihonika
- the coated uncured linear material was introduced into a pressurized steam curing tank provided with pressure seals at the inlet and outlet, and was cured at a vapor pressure of 23.5 Pa.
- a shaper equipped with a shaping die of 0.93 mm inside diameter and 0.70 mm inside diameter heated at ° C to shape the outer peripheral surface of the coating to obtain a coated tensile strength body 6 with a coating outer diameter of 0.7 mm. Then, it was wound continuously on the bobbin.
- Example 3 instead of 22.5 TeX glass yarn of Example 1, three 67.5 TeX glass yarns (Comparative Example 3), and 3 twisted 22.5 Tex yarns as each twisted yarn A coated tensile strength material was obtained in the same manner as in Example 1 except that three combined yarns (Comparative Example 4) were used.
- the glass fiber is not evenly dispersed in the cross section of the FRP part, it is in the shape of a rice ball, has poor roundness, and has directionality when bent, and cannot be used as a tensile strength member. there were.
- Comparative Example 4 in which three twisted yarns were used, in the step of impregnating the unsaturated polyester resin, the twisted yarn was loosened, the length of the yarn was reduced, and fluffing occurred. As a result, pinholes were generated in the step of coating the thermoplastic resin, and after curing, partially poorly cured portions occurred.
- the outer circumference of the FRP of the obtained coated tensile strength material is not uniform, the coating thickness after shaping to a diameter of 0.70 ⁇ is not uniform, and the FRP part is partially exposed. He was unsuitable as a body. This seems to be due to the fact that the dispersion of the glass fiber is insufficient and tends to be non-uniform within a predetermined dimension, in this comparative example, within an outer diameter of 0.4 mm.
- the drop optical fiber cable according to the present invention comprises: a coated tensile strength body in which a thermoplastic resin coating layer is applied to a tensile strength body made of a fiber-reinforced thermosetting resin cured product;
- the fiber core wire is covered with thermoplastic resin as a whole, and the outer periphery of the coated tensile strength body and the body coating are fused, and the outer periphery of the coated tensile strength body made of fiber reinforced thermosetting resin cured material
- Anchor adhesion with coating layer inner circumference Due to its structure, the tensile strength member suppresses thermal shrinkage of the main body coating, effectively protects the optical fiber core, and satisfies the heat cycle test and the ironing test.
- the drop optical fiber cable according to the present invention has an anchor bonding structure, the exposure of the strength member at the core in the connection operation can be easily peeled by making a cut in the coating layer. For this reason, compared to the conventional method using a cutting tool and the use of a drop adhesive cable that uses a solvent, which requires the use of a solvent, the work for anchoring to the termination cabinet is safer in a good environment. According to the present invention, it is possible to provide a small-diameter practical non-metallic drop optical fiber cable.
- thermosetting catalyst manufactured by Kayaku Axo Co., Ltd., Power Dox B—CH50: 4 parts, Cabutyl B: 1 part
- Bullester resin Japan Composite: Esther H810
- para-aramid fiber with a breaking elongation of 4.6% and a tensile modulus of 52 cN / dtex manufactured by Teijin: Technora T240, single yarn diameter 12; um, 1 6 70 dte X
- multifilament is guided through a guide, and then guided to a squeezing nozzle with a gradually decreasing inner diameter, and the uncured resin is drawn to form an outer diameter of 0.
- the uncured coated linear material was introduced at a speed of 15 m / min into an 18 m long pressurized steam curing tank provided with pressurized seals at the inlet and outlet, and the vapor pressure was 32.5.
- Cures at P a 145 ° C
- the coated tensile strength member 6b having a circular cross section with a coating outer diameter of 0.8 mm was obtained and wound continuously around a bobbin.
- the bobbin was subjected to a dry heat treatment (secondary heat treatment) for 40 hours in a constant temperature room at 40 ° C.
- the coated tensile strength member 6b has a reinforcing fiber content of the FRP portion of 61.1 VOL%, and has a minimum bending diameter (the coated tensile strength member is formed into a loop, and is bent so that the loop becomes small.
- the Noreppe diameter before bending failure occurred was 6 mm.
- Example 4 3.6% elongation at break, 490 d tensile modulus 490 d NZ dte X para-aramid fiber (manufactured by Toray DuPont: Kepler 29, single yarn diameter 12 ⁇ , 1670 dte)
- a coated tensile strength member 6b having a circular cross section was obtained in the same manner as in Example 4 except that one multifilament of (1) was used.
- the coated tensile strength member 6b has a reinforcing fiber content of 58.9 VOL% in the FRP portion and has a minimum bending diameter (the coated tensile strength member is formed into a loop, and the loop is bent so that the loop becomes small. Immediately before bending failure occurred, the (rape diameter) was 5 mm.
- Each of the coated tensile strength members 6b obtained in Examples 4 and 5 was subjected to a 24-hour heat-resistant bending diameter test at a temperature of 80 ° C, and was cleared to 3 O mm.
- the heat cycle test from 130 ° C to 80 ° C was repeated three times with a length of 100 mm, and the adhesion between the coating layer 5 b of the coated tensile member 6 b and the FRP tensile member 4 b was observed.
- shrinkage of the coating layer hardly occurred, showing good results.
- a supporting wire 7b one blue steel single wire of ⁇ 1.2 mm, two coated tensile strength members 6b obtained in the specific example 1, and an optical fiber core wire 2b of ⁇ 0. 25 Introduce one 5 mm single-mode fiber to the cross head, and use flame-retardant PE (Nippon Manufactured by: NUC9739), extruded and coated with a die having the shape as shown in Fig. 7, immediately performed primary cooling in a hot water cooling bath adjusted to 6 ° C, and then Secondary cooling was performed in a water cooling tank to obtain a drop cable 1b having a cross-sectional structure as shown in FIG.
- PE flame-retardant PE
- This coated tensile strength material has a reinforcing fiber content of 58.9 V in the FRP section.
- the minimum bending diameter (the loop diameter immediately before the bending failure occurred when the coated tensile strength member was formed into a loop and bent so as to reduce the loop) was 8 mm. Comparative Example 6
- This coated tensile strength material has a reinforcing fiber content of 55.8 VOL% in the FRP part, and has a minimum bending diameter (by forming the coated tensile strength material into a loop and bending the loop to make the loop smaller, The loop diameter just before the bubbling occurred was 10.5 mm.
- the required tensile strength and anti-compression property are reduced. It is possible to obtain an FRP tensile strength material with a small bending radius without any bending, and by using this FRP tensile strength material, it is possible to obtain a drop optical fiber cable with excellent layability. You.
- the tensile strength members made of FRP have a technical problem that they are easily broken with a large bending diameter as compared with those made of metal.
- the FRP diameter may be reduced to reduce the bending diameter at which the tensile strength is reduced.
- the reinforcing fibers are the same, the tensile strength decreases.
- the improvement in tensile strength alone can be solved by replacing the reinforcing fiber with a high-strength, high-elasticity type.
- the function of suppressing the shrinkage of the resin that constitutes the main body due to changes in environmental temperature (anti-shrinkage) ) Is also required, so as a means of reducing the contact area with the main body resin (making the anti-shrinkage function difficult to function), it is not preferable to reduce the diameter.
- an FRP tensile strength body having a small size and the FRP tensile strength body according to the present invention can sufficiently respond to such a demand.
- the FRP tensile strength member of the present invention it is possible to obtain an FRP tensile strength member having a small bending radius without lowering the required tensile strength and compression resistance. As a result, a drop optical fiber with excellent layability can be obtained, and can be effectively used when laying in a subscriber's house.
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Optical Fibers, Optical Fiber Cores, And Optical Fiber Bundles (AREA)
- Light Guides In General And Applications Therefor (AREA)
- Communication Cables (AREA)
- Surface Treatment Of Glass Fibres Or Filaments (AREA)
- Ropes Or Cables (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2003-385202 | 2003-11-14 | ||
JP2003385202A JP2005148373A (ja) | 2003-11-14 | 2003-11-14 | Frp製抗張力体およびドロップ光ファイバケーブル |
Publications (1)
Publication Number | Publication Date |
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WO2005047950A1 true WO2005047950A1 (ja) | 2005-05-26 |
Family
ID=34587352
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2004/006188 WO2005047950A1 (ja) | 2003-11-14 | 2004-04-28 | ドロップ光ファイバケーブルおよび同ケーブルに使用するfrp製抗張力体 |
Country Status (5)
Country | Link |
---|---|
JP (1) | JP2005148373A (ja) |
KR (1) | KR20060120097A (ja) |
CN (1) | CN100520468C (ja) |
TW (1) | TW200516284A (ja) |
WO (1) | WO2005047950A1 (ja) |
Cited By (2)
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EP2860562A4 (en) * | 2012-06-12 | 2016-02-17 | Fujikura Ltd | OPTICAL FIBER CABLE |
US11287591B2 (en) * | 2018-10-11 | 2022-03-29 | Fujikura Ltd. | Optical fiber cable |
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US7630605B2 (en) | 2007-06-26 | 2009-12-08 | Corning Cable Systems Llc | Optical fiber assemblies having relatively low-levels of water-swellable powder and methods therefor |
JP5306614B2 (ja) * | 2007-08-09 | 2013-10-02 | 古河電気工業株式会社 | 光ファイバケーブル |
JP2009172995A (ja) * | 2007-12-27 | 2009-08-06 | Ube Nitto Kasei Co Ltd | 熱可塑性樹脂被覆frp線条物及びその製造方法 |
US7916989B2 (en) | 2008-07-31 | 2011-03-29 | Corning Cable Systems Llc | Optical fiber assemblies having a powder or powder blend at least partially mechanically attached |
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JP5431827B2 (ja) * | 2009-08-11 | 2014-03-05 | 宇部エクシモ株式会社 | 略矩形状熱可塑性樹脂被覆frp線条物の製造方法、及び同frp線条物を用いたドロップ光ファイバケーブル |
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CN101923199B (zh) * | 2010-08-20 | 2012-06-13 | 烽火通信科技股份有限公司 | 一种制备纤维增强塑料加强件一体化光缆的方法及该光缆 |
RU142326U1 (ru) | 2010-10-28 | 2014-06-27 | КОРНИНГ КЭЙБЛ СИСТЕМЗ ЭлЭлСи | Волоконно-оптические кабели с экструдированными элементами доступа и способы изготовления волоконно-оптических кабелей |
CA2817836C (en) | 2010-11-23 | 2018-06-26 | Corning Cable Systems Llc | Fiber optic cables with access features |
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US9274302B2 (en) | 2011-10-13 | 2016-03-01 | Corning Cable Systems Llc | Fiber optic cables with extruded access features for access to a cable cavity |
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US9201208B2 (en) | 2011-10-27 | 2015-12-01 | Corning Cable Systems Llc | Cable having core, jacket and polymeric jacket access features located in the jacket |
US9176293B2 (en) | 2011-10-28 | 2015-11-03 | Corning Cable Systems Llc | Buffered fibers with access features |
US8909014B2 (en) | 2012-04-27 | 2014-12-09 | Corning Cable Systems Llc | Fiber optic cable with access features and jacket-to-core coupling, and methods of making the same |
US9482839B2 (en) | 2013-08-09 | 2016-11-01 | Corning Cable Systems Llc | Optical fiber cable with anti-split feature |
CN103984071B (zh) * | 2014-05-06 | 2017-02-15 | 江苏南方通信科技有限公司 | 新型全介质通信光缆 |
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EP2860562A4 (en) * | 2012-06-12 | 2016-02-17 | Fujikura Ltd | OPTICAL FIBER CABLE |
US11287591B2 (en) * | 2018-10-11 | 2022-03-29 | Fujikura Ltd. | Optical fiber cable |
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Also Published As
Publication number | Publication date |
---|---|
TW200516284A (en) | 2005-05-16 |
CN1882863A (zh) | 2006-12-20 |
JP2005148373A (ja) | 2005-06-09 |
TWI297788B (ja) | 2008-06-11 |
KR20060120097A (ko) | 2006-11-24 |
CN100520468C (zh) | 2009-07-29 |
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