KR20210063934A - method of manufacturing light weight optical cable - Google Patents

Abstract

The present invention relates to a method for manufacturing a small-sized optical cable, comprising the steps of: (a) forming a loose buffer with an LSZH material on the outer side of optical fiber through a first nipple and a first die; and (b) winding a first sheath on a first winding roller while forming the first sheath with the LSZH material such that a first aramid yarn is accommodated on the outer side of the loose buffer through a second nipple and a second die, wherein, in the step (a), tension applied to the optical fiber is 80-120 g, extrusion temperature is 123-160℃, and line speed is 100-120 mpm, and in the step (b), tension of the loose buffer is 200-250 g, tension of the first aramid yarn is 300-320 g, tension of the first sheath wound on the first winding roller is 800-1000 g, extrusion temperature is 120-140℃, and line speed is 40-50 mpm. The method for manufacturing the small-sized optical cable can prevent mutual adhesion of sheaths in the optical cable, ensure a purposed elongation condition, reduce the size and weight and easily peel a sheath material.

Description

Method of manufacturing light weight optical cable

The present invention relates to a method for manufacturing a miniaturized optical cable, and more particularly, to a method for manufacturing a miniaturized and lightweight optical cable.

In general, an optical cable refers to a type of optical fiber that transmits data using the principle of total reflection of light to be accommodated in the sheath.

Such an optical cable has been disclosed in various ways, such as Korean Patent Publication No. 10-2006-00187472.

On the other hand, an optical cable used to transmit broadcast/communication data to a subscriber using an optical transmission network, a Fiber To The Home (FTTH) network, uses a loose tube or a buffer tube to protect the optical fiber.

Recently, with the increase in the use of optical cables due to the increase in demand for optical communication, the demand for miniaturization of optical cables itself, that is, reduction of the diameter of optical cables, continues.

Accordingly, there is a need for a method capable of easily peeling off the optical cable covering material and minimizing shrinkage while suppressing adhesion between different coverings to realize miniaturization of the optical cable.

The present invention was devised to solve the above requirements, and provides a method for manufacturing a miniaturized optical cable capable of easily peeling off the covering material of an optical cable and minimizing shrinkage while suppressing adhesion between different coverings. There is a purpose.

In order to achieve the above object, the method for manufacturing a miniaturized optical cable according to the present invention is a. forming a loose buffer made of LSZH material on the outside of the optical fiber through the first nipple and the first die; I. and winding the first aramid yarn on the first winding roller while forming a first sheath of LSZH material so that the first aramid yarn is accommodated on the outside of the loose buffer through the second nipple and the second die. The tension used is 80 to 120 g, the extrusion temperature is 123 to 160 ° C, the line speed is 100 to 120 mpm, the inner and outer diameters of the first nipple are 0.6 mm and 1.1 mm, and the inner diameter of the first die is 1.35 mm, the tension of the loose buffer in step B is 200 to 250 g, the tension of the first aramid yarn is 300 to 320 g, and the tension of the first sheath wound around the first winding roller is 800 to 1,000 g, The extrusion temperature is 120 to 140 ° C, the line speed is 40 to 50 mpm, the inner diameter of the end of the second nipple is 1.4 mm, the outer diameter is 1.8 mm, and the extension length extending from the end of the second nipple to the same inner diameter is 5 to 7 mm, The inner diameter of the end of the second die is 2.8 mm, and the extension length extending from the end of the second die to the same inner diameter is 0.1 to 2 mm.

According to one aspect of the present invention, c. Winding on the second winding roller while forming the second sheath with HDPE material so that the second aramid yarn and the waterproof yarn are accommodated on the outside of the first sheath through the third nipple and the third die, and the rip cord and FRP wire are embedded Further comprising:, in the multi-step, the tension of the first sheath is 2,000 to 2,500 g, the tension of the second aramid yarn is 300 to 400 g, and the tension of the second sheath wound around the second winding roller is 4,000 to 5,000 g, an extrusion temperature of 170 to 195° C., a line speed of 30 to 40 mpm, and the third nipple has an inner diameter and an outer diameter of the first central hole at the end through which the first sheath is passed, 3.3 mm, 3.6 mm, and the third The inner diameter of the end of the die is 5.8 mm, the extension length extending from the end of the third die to the same inner diameter is 1 to 3 mm, and the lip is spaced symmetrically from the first central hole of the third nipple. The inner diameters of the first and second horizontal side holes through which the cords pass each are 0.58 mm, the separation distances of the first and second horizontal side holes are 5 to 6 mm, and the FRP lines are symmetrically spaced from the first central hole to pass through. The inner diameter of the first and second vertical sideholes to be 0.9mm, the first and second vertical sideholes are 4 to 5mm apart.

According to the method for manufacturing a miniaturized optical cable according to the present invention, it is possible to prevent adhesion between the coatings in the optical cable, to secure the desired elongation condition, and to reduce the size and weight, and to provide the advantage that the coating material can be easily peeled off.

1 is a cross-sectional view showing an optical cable manufactured according to the manufacturing method of the present invention;
2 is a view showing an example of equipment for explaining the manufacturing process of the optical cable of FIG. 1;
Fig. 3 is a schematic cross-sectional view of an element applied to the equipment of Fig. 2 to form the loose buffer and the first sheath of Fig. 1;
Fig. 4 is a schematic cross-sectional view of an element applied to the equipment of Fig. 2 to form the second sheath of Fig. 1;
5 is a view for explaining the hole arrangement structure of the third nipple of FIG.

Hereinafter, with reference to the accompanying drawings, an object of the present invention is to provide a method for manufacturing a miniaturized optical cable according to a preferred embodiment of the present invention.

1 is a cross-sectional view showing an optical cable manufactured according to the manufacturing method of the present invention.

Referring to FIG. 1 , the optical cable 100 includes an optical fiber 110 , a loose tube 120 , a first aramid yarn 130 , a first sheath 140 , a second aramid yarn 150 , and a rip cord 160 . , the FRP wire 170, the waterproof yarn 180 and the second sheath 190 is made.

When used only for indoor use, only the first sheath 140 is formed, and when used for outdoor use, up to the second sheath 190 is formed.

As shown in FIG. 2 , the optical cable 100 is coated through a coating machine 10 that is extruded through a die together with a coating material for supply elements, and then is wound through a primary winding roller 250 . manufactured through Reference numeral 230 denotes a cooler for cooling the coating material.

Hereinafter, the manufacturing process of such an optical cable will be described.

First, the loose buffer 120 is formed on the outside of the optical fiber 110 using a LSZH (Low Smoke Zero Halogen) material.

As shown in FIG. 3 , the loose buffer 120 is formed of a loose buffer 120 made of LSZH material on the outside of the optical fiber through the first nipple 310 and the first die 320 mounted in the coater 210 . do.

The loose buffer 120 is preferably manufactured to be peelable within 10 seconds when peeling 1m using a stripper, and for this purpose, the tension applied to the optical fiber 110 supplied through the first nipple 310 is 80 to 120 g, the extrusion temperature of the first die 320 is 123 to 160 ℃, the line speed is applied to 100 to 120 mpm (meter / min). In addition, the inner diameter (a1) of the end of the first nipple 310 with the through hole 311 formed in the center so that the optical fiber 110 can be transferred in a penetrating state is 0.6 mm, and the outer diameter of the end is 1.1 mm. and the inner diameter b1 of the end of the first die 320 is 1.35 mm. The LSZH material is supplied to the first die 320 through an injection hole indicated by reference numeral 325 .

When the loose buffer 120 is formed through this process, the loose buffer 120 is installed to be supplied to the coater 210, and then the first aramid yarn is provided on the outside of the loose buffer 120 through the second nipple and the second die. It is wound around the first take-up roller 260 while forming the first sheath 140 of the LSZH material so that the 130 is accommodated.

The tension of the loose buffer 120 supplied in the process of forming the first sheath 140 is 200 to 250 g, and the tension of the first aramid yarn 130 is 300 to 320 g. Here, if the tension applied to the first aramid yarn is 350 g or more, it is preferable to apply 300 to 320 g, which is lower than 350 g, because curl and fluff occur.

In addition, the tension of the first sheath 140 wound around the first winding roller 260 is 800 to 1,000 g, the extrusion temperature of the second die 340 is 120 to 140° C., and the line speed is 40 to 50 mpm. . In addition, the inner diameter of the second nipple 330 applied to the first sheath 140 forming process is 1.4 mm and the outer diameter is 1.8 mm, and the extension length c1 horizontally extending from the end to the same inner diameter (1.4 mm) is 5 to 7mm, the inner diameter (b1) of the second die 340 is 2.8mm, and the extension length d1 horizontally extended from the end of the second die 340 to the same inner diameter (2.8mm) is 0.1 to 2mm. .

What is formed up to the first sheath 140 may be used indoors.

On the other hand, in order to use it for outdoor use, up to the first sheath 190 is formed.

For this, the second aramid yarn 150 and the waterproof yarn 180 are accommodated on the outside of the first sheath 140 through the third nipple 410 and the third die 420 as shown in FIG. The cord 160 and the FRP wire 170 are wound around the second winding roller 270 while forming the second sheath 190 of the HDPE material.

Here, the FRP wire 170 is applied by coating a coating material mixed with 80 parts by weight of HDPE to 20 parts by weight of an adhesive resin EAA (ethylene acrylic acid) to a thickness of 1 to 3 μm on the outer peripheral surface of the FRP core wire. In this case, the second sheath 190 and the FRP wire 170 are bonded to each other to minimize the shrinkage of the second sheath 190 .

The tension of the first sheath 140 supplied to the third nipple 410 to form the second sheath is 2,000 to 2,500 g, the tension of the second aramid yarn 150 is 300 to 400 g, and the second winding roller 270 ), the tension of the second sheath 190 wound around 4,000 to 5,000 g, the extrusion temperature is 170 to 195 ° C, and the line speed is 30 to 40 mpm.

Here, if the tension applied to the first sheath is less than 2,000, it is difficult to secure straightness, so normal molding is not performed, and if it is 2600 or more, there is a problem that coating, that is, adhesion to the first sheath occurs, so 2000 to 2,500 are applied.

In addition, the tension applied to the second aramid yarn 150 suppresses the elongation and applies 300 to 400 g, which is the maximum value for the transverse length to be 8 to 9 mm based on 5 meters. In consideration of the fact that the optical cable 100 shrinks in the air-cooling section before cooling after extrusion, the tension applied to the second aramid yarn 150 has no practical effect, so applying a tension of 300 to 400 g is not effective. desirable.

The third nipple will be described with reference to FIG. 5 . The third nipple 410 has an inner diameter a2 of 3.3 mm and an outer diameter of 3.6 mm of the first central hole 412 through which the first sheath 140 passes, and an extension of the first central hole 412 having the same inner diameter. The length c2 is 1 to 4 mm, and the inner diameter of the first and second horizontal side holes 415 and 416 through which the rib cord 160 passes is symmetrically spaced apart from the first central hole 412 is 0.58. mm, the separation distance n1 of the first and second horizontal side holes 414 and 415 is 5 to 6 mm, and the first central hole 412 is symmetrically spaced apart from each other to allow the FRP line 170 to pass through. The inner diameter of the first and second vertical side holes 417 and 418 is 0.9 mm, the separation distance n2 of the first and second vertical side holes 417 and 418 is 4 to 5 mm, and the third die ( The inner diameter of 420 is 5.8mm, and the extension length d2 horizontally extending from the end of the third die 420 to the same inner diameter (5.8mm) is 1 to 3mm.

By this manufacturing method, the outer diameter of the first sheath 140 is 2.75 mm, the total weight is 6.19 kg/km, the outer diameter of the second sheath 190 is 5.0 mm, and the total weight is 22.1 kg/km. was prepared.

On the other hand, if the post-shrinkage rate is severe due to the post-shrinkage phenomenon in which the coating is cultured in a regular molecular chain form during the extrusion process, and changes over time to a disordered and stable molecular chain form during cooling, solidification, and storage, the coating is placed under pressure on the optical fiber 110 . Although it is possible to cause bending and disconnection by adding , the optical cable 100 manufactured by the above-described manufacturing method was maintained at a temperature of 75° C. in a constant temperature chamber for 5 hours and then the shrinkage rate due to the change in length was calculated as a result of the buffer tube 120 and the first sheath 140 exhibited a shrinkage rate of 0.5%, and the second sheath 190 exhibited a shrinkage rate of 1.5%.

On the other hand, as a part to ensure that the elongation of the optical cable 100 is 0.7% or less, the cross-dressing length of the first and second aramid yarns 120 and 150 was confirmed to be 8 to 13 mm based on 5 meters, and the optimal cross-dressing length was It is 10 mm, and the tension condition described above was applied to satisfy this.

110: optical fiber 120: loose tube
130: first aramid yarn 140: first sheath
150: second aramid yarn 160: lip code
170: FRP wire 180: waterproof yarn
190: second sheath

Claims (3)

end. forming a loose buffer with LSZH material on the outside of the optical fiber through the first nipple and the first die;
I. Winding on the first winding roller while forming a first sheath with LSZH material so that the first aramid yarn is accommodated on the outside of the loose buffer through the second nipple and the second die;
The tension applied to the optical fiber in step A is 80 to 120 g, the extrusion temperature is 123 to 160 ° C, and the line speed is 100 to 120 mpm, and the inner and outer diameters of the ends of the first nipple are 0.6 mm, 1.1 mm, and the second 1 The inner diameter of the end of the die is 1.35mm,
In step B, the tension of the loose buffer is 200 to 250 g, the tension of the first aramid yarn is 300 to 320 g, the tension of the first sheath wound around the first winding roller is 800 to 1,000 g, and the extrusion temperature is 120 to 140° C., the line speed is 40 to 50mpm, the inner diameter of the end of the second nipple is 1.4mm, the outer diameter is 1.8mm, and the extension length extending from the end of the second nipple to the same inner diameter is 5 to 7mm, the second The inner diameter of the end of the die is 2.8mm, and the extension length extending from the end of the second die to the same inner diameter is 0.1 to 2mm. The method of claim 1,
All. Winding on the second take-up roller while forming the second sheath with HDPE material so that the second aramid yarn and the waterproof yarn are accommodated on the outside of the first sheath through the third nipple and the third die, and the rip cord and the FRP wire are embedded further comprising:
In the multi-step, the tension of the first sheath is 2,000 to 2,500 g, the tension of the second aramid yarn is 300 to 400 g, and the tension of the second sheath wound around the second winding roller is 4,000 to 5,000 g, and extrusion The temperature is 170 to 195 ° C, the line speed is 30 to 40 mpm, and the third nipple has an inner diameter and an outer diameter of the first central hole at the end through which the first sheath passes are 3.3 mm and 3.6 mm, and the inner diameter of the end of the third die is It is 5.8mm, and the extension length extending from the end of the third die to the same inner diameter is 1 to 3mm. According to claim 2, wherein the inner diameter of the first and second horizontal side holes spaced symmetrically from the first central hole of the third nipple through which the rib cord passes, respectively, is 0.58 mm, the first and second horizontal sides The separation distance of the hole is 5 to 6 mm, the inner diameter of the first and second vertical side holes through which the FRP line passes is symmetrically spaced apart from the first central hole is 0.9 mm, the separation distance of the first and second vertical side holes is 4 A method for manufacturing a miniaturized optical cable, characterized in that it is 5 mm to 5 mm.

Images