Production of optical fiber core

[Detailed Description of the Invention]

The present invention relates to the manufacturing method of the optical fiber cable core of tight structure type which has a high elastic modulus secondary enveloping layer with a low coefficient of linear expansion. Thing 1 for which an optical fiber (the following, a fiber, and a brief sketch) is covered is conventionally performed by two methods shown below for the purpose of forming a highly reliable optical fiber transmission track. One of them is a three-layer structural form fiber cable core, and it usually forms a buffer layer by silicone resin him who covered the primary fiber with denaturation silicone resin, and on it, and produces it by giving To *- a secondary enveloping layer with nylon resin on it. That is, it is a fiber cable core of tight structure type. Other one is a Ruth tube type fiber cable core, and it produces it by holding to Ruth the fiber matter line covering 1u Carried out in primary covering or primary covering, and a buffer layer within the protection plastic tube which consists of materials, such as nylon resin or Polyp 4 pyrene resin. Usually, although it is an air layer between the above-mentioned wall in a plastic tube, and a fiber matter line, it may be filled up with liquefied Sitwell- or silicone oil etc. at room temperature. The elastic modulus of the secondary enveloping layer of the fiber cable core produced by the two above-mentioned method is number GPa, a coefficient of linear expansion is Udah of ten to 1 " C-1, and this is an elastic modulus of about 700 Pa of the fiber itself, and lIi! Rate-of-expansion 10-"C''''1''1 Udah! .. With To, they are a low elastic modulus and a high coefficient of linear expansion far. There were Hazama points -- the increase in the path loss in the low temperature by that the intensity reinforcement by a tension member etc. is indispensable for This I and also temperature contraction of a secondary enveloping layer is not avoided. for - reason which solves Remark between this etc., the manufacturing method of the fiber cable core which uses external heating together and forms into the rate of high elasticity and a low coefficient of linear expansion the plastic tube (the following, a tube, and evocation) which should serve as a secondary enveloping layer by [ inside ] carrying out extension heating dielectrically is proposed. this method -- fiber matter line outside diameter 1 -- extending a tube and making for [ of the molecule chain ] Arrangement carry out in the extension direction, passing fiber Rope in a tube with a larger inside diameter than .., -- rate[ of high elasticity ]-izing -- a low coefficient of linear expansion is formed. Therefore, the tube running speed, and fiber matter line driving speed 1- and the degree in a tube extension process differ from each other. With extension of a tube, a tube inside diameter decreases and the clearance with a fiber matter line becomes small. with reduction of the above-mentioned clearance, the frictional force by contact with the wall in a tube and the fiber matter line surface becomes large -- A fiber running speed - " .. (3) -- it becomes impossible to control to a law Therefore, in order to obtain the rate of high elasticity, and a low coefficient of linear expansion tight structure type fiber cable core by the above-mentioned method, exact control of '' and a Facial expression tube extrusion-molding process was as indispensable as the fiber matter line manufacture fault, such as pressing down very small change of a fiber matter line outside diameter and a tube inside diameter. In order that the present invention may solve problems, such as this accompanying manufacture of the tight structure type fiber cable core by the above-mentioned dielectric-heating extending method, The inside of a tube is filled up with un-hardening and liquefied heat hardening 10 sex or thermoplastics, It is characterized by hardening or solidifying restoration liquid and making a primary enveloping layer form after formation of the secondary enveloping layer by tube extension, and the object is to provide the tight structure type fiber cable core which excelled [ high intensity ] in path loss. Drawing 1 is an approximate account figure of the length type tight structure type fiber cable core manufacture device by the dielectric-heating extending method for carrying out the present invention, and 1 is delivery Dora ゝ of a fiber matter line. Di which Beam and 2 make a fiber matter line and to whom 8 carries out extrusion molding of the tube, and 4 are un-hardening, liquefied thermosetting, or Melting! .. (4) Liquid-sending pump 5 which sends out the thermoplastics in Melting state is a liquid-sending tube, the tube for which 6 contains a fiber matter line, thermosetting, or thermoplastics in the inside, and 7 -- as for a tube taking over machine and 11, a tube delivery machine and 9 are [ a tube taking over machine and 18 ] rolling-up drums Ju and - Buanir furnace, and 12 a dielectric-heating furnace and 10 a tube cooling trough and 8. The fixed back tension is acting on delivery drum 1, and fiber 2 lets out under fixed tension by it. the shape where extrusion Di 8 is constant -- an owner .. the tube to carry out is pushed out continuously. Liquid-sending pump 4 sends out the thermoplastics in a fixed quantity of un-hardening, liquefied thermosetting, or a molten state. Liquid-sending tube 5 sends the thermoplastics in un-hardening, liquefied thermosetting, or a molten state to extrusion Di 3. Temperature control is carried out at Il theta°C~80-degreeC, and cooling trough 7 carries out the full solidification of the tube 6 pushed out from extrusion Di 8. By pressing down tube 6 by two belts which rotate at fixed speed, delivery machine 8 determines Chi 2 to the tube extrusion speed and dielectric-heating device 9 from extrusion Di 8, and a Yube speed of supply. By dielectric heating which used together outside one-copy heating, Dielectric heating @9 is maintained at the ambient temperature which is easy to extend tube 6 at the same time it heats a tube amorphism part alternatively. Taking over machine 10 kicks tube 6 five with control by two belts which rotate at fixed speed, by the ability to determine the tube taking over speed after extension, and the tube delivery speed to Annealing furnace 11, Annealing furnace 11 is a heating furnace of constant temperature, raises the temperature of heat hardening 10 unhardened sex, and speeds up hardening at the same time it removes the tube contraction after extension. 1 .. Taking over machine 12 determines a final manufacture speed of a fiber cable core at the same time it determines the tension which acts on tube 6 into Annealing by This E which presses down tube 6 by two belts which rotate at fixed speed. Rolling-up drum 18 rolls round a fiber cable core. I and Drawing 2 are extrusion Di's 8 schematic diagrams, and the tube which has 14 in a molten state, and 16 are thermoplastics in un-hardening, liquefied heat hardening type, or a molten state. The heat hardening type or thermoplastics 15 sent into extrusion Di 8 with liquid-sending tube 6 flows in extrusion 2.1 Di 8, falls, and accumulates inside tube 6 in place 1 which came out of extrusion die lips. The height of the surface of heat hardening type or thermoplastics]5 can be arbitrarily decided by controlling the amount of liquid sending. In order to operate this, speed of delivery machine 8 and taking over machine 10.1 taking-over machine 12 is made almost equal, and external heating of dielectric-heating device 9 is raised to a predetermined temperature. Then, after pushing out tube 6 from extrusion Di 8, and manual operation's taking over and passing the inside of each device one by one, even taking over machine 12 supplies. Then, dielectric heating 1 and the dielectric-heating output of one device 9 are raised gradually, and the taking over speed of taking over machine 10.12 is gradually raised to -F Kicking, a target output, and a draw ratio simultaneously with it. Next, it lets out fiber 2 from delivery drum l, and supplies the inside of tube 6 to through and taking over machine 12. this time -1 * -- the back tension of a law is made to act on Tsua 2 on delivery drum 1 Then, the thermoplastics which is in un-hardening, liquefied thermosetting, or a molten state from liquid-sending pump 4 is sent to extrusion Di 8 with tube 5. 1 * (7) As shown in Drawing 2, sent-out the heat hardening l nature or thermoplastics is applied to a fiber at extrusion Di's 8 entrance, is fed with a fiber, and accumulates in the place which came out of die lips temporarily. Then, since thermosetting or thermoplastics 15 is consumed little by little, Full doing the opening between the inner walls of fiber 2 and tube 6, the quantity compensated with a part for the consumption is regularly sent out from a liquid-sending pump, and the height of the above-mentioned surface is kept constant. By the above operation method, they are un-hardening or semi-hardening 1.. The fiber cable core in which it filled up with the thermoplastics in thermosetting or a molten state is obtained in the stage of taking over machine 12. Then, a tight structure type fiber cable core is formed with hardening of thermosetting resin, or solidification of thermoplastics. Plastic tube material in the present invention, If it is thermoplastics, it is usable, and it is as a concrete material name, For example, polyether, such as polyolefin, such as polyethylene and polypropylene, and polyoxymethylene, Polyester, such as (8) polyethylene terephthalate, 1 polyacrylonitrile, polyvinyl alcohol, poly vinylidene fluoride, etc. are raised to polyamide, such as nylon. if the thermosetting resin in the present invention is what has the viscosity below about 2000 Cps at the time of un-hardening -- * -- it is usable, material in particular is not limited, and silicone resin, an epoxy resin, etc. are raised as a concrete material name. As thermoplastics, if it has the viscosity below 2000 cps at the time of fusion, it is usable, and it is Limit 1 especially about material.. Although a law is not carried out, the polymers etc. which present the liquid crystal state of hypoviscosity are raised with low-molecular quantity polymers and a molten state. Hereinafter, the example using the device of Drawing 1 is shown. Example of real elder sister 1 The outside diameter of the used fiber matter line was 0.2mmphi including the denaturation Thilly Sean layer. An 800-g back tension was put on the above-mentioned fiber. As a charge of tube material, polyoxymethylene (density 1.41p can 8, melting point 165degreeC, number average molecular weight 80,000, -... weight average molecular weight 160,000) was used. About the above-mentioned Vo l Reoxy methylene (the following, POM, and brief sketch), it is Raddai (die temperature 165degreeC) to crossing at screw-rotation-speed 8Orpm by a 20 ?lLmphi extrusion machine. From die-lips outside diameter a, om@phi, and inside diameter L5imphi, extrusion molding was carried out by taking over speed The (tube delivery speed) 1.14 Vmin, and outside diameter 5.1mmphi, inside diameter g, and the unextended POM tube of 2 mmphi were produced. This was extended by taking over speed 23J Vmin with External addition 1 * heat using the dielectric-heating device (oscillating frequency 2.45 GHz and cylindrical waveguide 8crn1 inside diameter 95.6mmfor heating phi, maximum output 1.s KW) as dielectric-heating device inlet temperature 40degreeC and outlet temperature 140degreeC. Temperature of the Annealing furnace was set to 170 degreeC, and taking over speed after Annealing(ing) was set to 28.51-mone n. The final draw ratio in this case was 19.7. As 15 thermosetting resin, the silicone resin which has viscosity 8 Is Ocps by 26 degreeC was used. The outside diameter of the obtained extension POM tube was 1.1mmphi, the inside diameter was 0.5m'mphi, the coefficient of linear expansion was I X I O-'°C-1 and the tensile elastic modulus was 25 GPa. That is, the tight structural form fiber cable core of the low coefficient of linear expansion and the rate of 70 high elasticity was able to be obtained. Example 2 The outside diameter of the used fiber matter line was 0.445 mmphi including the buffer layer. Other used material and charges, a device, etc. were the same as Example 1. The characteristic of the obtained tight structure type fiber cable core was almost the same as Example 1. Example 8 The outside diameter of the used fiber matter line is a buffer layer 1 .. It was hidden 0.445 mmphi. The epoxy resin which blended base resin (viscosity 700~1100 cps in 25 degreeC) and a hardening agent (viscosity 90~1.80 cps in 25 degreeC) with l= 1 was used as thermosetting resin. Material, a device, etc. which others used are the same as Example 1, and are 11 Ah. In this case, the tight structure type fiber cable core which takes denaturation silicone resin layer-Si and 4N structure that consists of a secondary Ricorn dark oil layer-Epoxy resin layer-POM enveloping layer was able to be obtained. As explained above, the present invention is plus Ticchi2. Since thermosetting or thermoplastics filled between the fiber matter line and the wall in a tube is hardened or solidified after using external heating together, heating Use dielectrically and carrying out stretch orientation processing at high 1 degree, There is an advantage that the tight structure type fiber cable core which has a rate of high elasticity and a low coefficient of linear expansion is producible to Capacity and Easy.

[Brief Description of the Drawings]

The explanatory view of the fiber cable core manufacture device with which Drawing 1 carries out the present invention, and Drawing 2 are extrusion Di's schematic diagrams. 1 degree * and a fiber delivery drum, 2 ... A fiber, 8 ... Tube extrusion Di, 4 ... liquid-sending pump, 5 ... tube for liquid sending, 6 ... tube, 7 ... cooling trough, 8 ... tube delivery machine, 9 ... dielectric-heating device, 10 ... tube taking over machine, 11 ... Annealing furnace, 12 ... tube taking over machine, 18 ... a cable core rolling-up drum and 1*14 ... The tube, 15 in a molten state ... Thermoplastics in un-hardening, liquefied thermosetting resin, or a molten state.