1297788 (1) 玖、發明說明 【發明所屬之技術領域】 本發明是關於下路光纖電纜及使用在同電纜的FRP 製抗張力體，尤其是關於一種重量輕，可實現細徑化，而 且適合作爲落線（drop wire )的非金屬型下路光纖電纜、 以及適用在非金屬型下路光纖電纜的FRP製抗張力體。 【先前技術】 隨著資訊化社會的到來，網際網路等之傳輸資訊容量 的增大化，在大樓、住宅等加入者也鋪設光纖電纜的 FTTH ( Fiber To The Home ;光纖到家）化正快速發展。 就FTTH用下路光纖電纜而言，提案有將金屬線使用 於抗張力體的形態。（參照日本特開200 1 -3 3 72 5 5號公報 、第2頁、第1圖） 然而，在抗張力體使用金屬線時，爲了避免雷擊所造 成的衝擊（surging )就必須接地。爲了取得接地，不僅 工程費時，還需要伴隨而來的工程費用，因而成爲普及至 各家庭的阻礙。於是，需要一種採用不需要接地工程之非 金屬抗張力體的非金屬型下路光纖電纜。 使用在這種光纖電纜的非金屬型抗張力體有纖維強化 合成樹脂（FRP )製線狀物，但如果取代金屬線抗張力體 而單單使用FRP線，在與主體包覆之熱可塑性樹脂的接 著不易、接著不夠充分的情況下，會導致熱履歷所造成的 光傳送損失之增大、或斷線等的異常’因而無法充分發揮 -5- (2) (2)1297788 下路光纖電纜的功能。 在此情況下，藉由在硬化的FRP線外圍塗布接著劑 、或是包覆接著性樹脂，亦可強化接著力，但工數、材料 費的增加會導致成本增加，並非好的對策，如果與FRP 的接著過於穩固，則進行連接工程時，又很難使爲了避免 拉往成端箱的包覆部剝離。 於是，本案申請人之前揭示了 一種使FRP交界與熱 可塑性樹脂包覆相互錨接的熱可塑性樹脂包覆纖維強化合 成樹脂製棒狀物之製造方法。（參照日本特公昭63 -2772 號公報） 此製造方法是用熔融的熱可塑性樹脂包覆使補強纖維 束浸泡在未硬化之熱硬化性樹脂而成的未硬化狀補強芯部 ，然後立刻使該熱可塑性樹脂的包覆層冷卻固化之後，將 此導入加壓高溫蒸氣的硬化槽，使補強芯部與該包覆層的 交界部分以軟化、流動狀態接觸，同時加熱該熱硬化性樹 脂使其硬化，接下來使包覆熱可塑性樹脂冷卻而使纖維強 化熱硬化性樹脂（FRP )構成的芯部交界與包覆熱可塑性 樹脂錨接。 然而，在下路光纖電纜的抗張力體使用藉由這種製造 方法得到之棒狀物的情況下，會有以下所說明的技術性課 題。 亦即，根據上述公告公報所揭示的製造方法，例如以 玻璃纖維作爲補強纖維，在熱硬化性樹脂使用不飽和聚酯 ，並以聚乙烯包覆的情況下，棒狀物雖可獲得106kg/cm2 -6- 12977881297788 (1) 玖 发明 发明 发明 发明 发明 发明 发明 发明 发明 发明 发明 发明 发明 发明 发明 发明 发明 发明 发明 发明 发明 发明 发明 发明 发明 发明 发明 发明 发明 发明 发明 发明 发明 发明 发明 发明 发明 发明 发明 发明 发明 发明 发明 发明 发明 发明 发明 发明A non-metallic drop fiber cable with a drop wire and a FRP tensile body suitable for a non-metallic drop fiber cable. [Prior Art] With the advent of the information society, the transmission of information capacity such as the Internet has increased, and FTTH (Fiber To The Home), which is also a fiber-optic cable, has been rapidly installed in buildings and residential buildings. development of. In the case of a FTTH fiber optic cable, a metal wire is proposed for use in a tensile body. (Refer to JP-A-200 1 - 3 3 72 5 5, page 2, and Figure 1) However, when a wire is used for a tension-resistant body, it is necessary to ground in order to avoid a surge caused by a lightning strike. In order to obtain the grounding, not only is the project time-consuming, but also the engineering cost that comes with it, which is a hindrance to the spread of the family. Thus, there is a need for a non-metallic drop fiber optic cable that employs a non-metallic tensile body that does not require grounding. A non-metallic type tensile-resistant body using such a fiber-optic cable is made of a fiber-reinforced synthetic resin (FRP), but if the FRP wire is used instead of the metal wire tensile body, it is difficult to adhere to the thermoplastic resin coated with the main body. If it is not sufficient enough, the optical transmission loss caused by the thermal history will increase, or the abnormality such as disconnection will occur. Therefore, the function of the -5-(2) (2) 1297788 optical fiber cable cannot be fully utilized. In this case, the adhesion can be enhanced by applying an adhesive to the periphery of the hardened FRP line or by coating the adhesive resin. However, an increase in the number of work and materials causes an increase in cost, which is not a good countermeasure. When the connection with the FRP is too stable, it is difficult to peel off the coating portion to avoid pulling to the end box when the joining process is performed. Accordingly, the applicant of the present application has previously disclosed a method for producing a rod made of a thermoplastic resin-coated fiber-reinforced synthetic resin which bonds the FRP junction with a thermoplastic resin coating. (refer to Japanese Laid-Open Patent Publication No. SHO-63-2772) This manufacturing method is to apply an uncured reinforcing core portion in which a reinforcing fiber bundle is immersed in an uncured thermosetting resin by a molten thermoplastic resin, and then immediately After the coating layer of the thermoplastic resin is cooled and solidified, it is introduced into a hardened tank of pressurized high-temperature steam, and the boundary portion between the reinforcing core portion and the coating layer is brought into softening and flowing state, and the thermosetting resin is heated. After hardening, the coated thermoplastic resin is cooled to bond the core boundary composed of the fiber-reinforced thermosetting resin (FRP) to the coated thermoplastic resin. However, in the case where the tensile strength body of the lower optical fiber cable uses the rod obtained by this manufacturing method, there will be a technical problem described below. That is, according to the manufacturing method disclosed in the above publication, for example, glass fiber is used as the reinforcing fiber, and when the thermosetting resin is made of unsaturated polyester and coated with polyethylene, the rod can be obtained by 106 kg/ Cm2 -6- 1297788
(lOOMPa)左右的接著強度，但包覆表面並不一定平滑 ，而有不易獲得均一且直徑小的成品的問題。 而且，使用在這種下路光纖電纜的FRP製抗張力體 比起金屬製抗張力體，有彎曲直徑大而容易折損的技術性 課題，要縮小會導致折損的彎曲直徑，雖然只要縮小FRP 直徑即可，但在補強纖維相同的情況下，就會有抗張力減 少的問題。 在此情況下，僅針對抗張力的改善可藉由將補強纖維 替換成高強度·高彈性率形式而加以解決，但也要求可抑 制本身構成會隨著環境溫度而變化之主體的樹脂之收縮的 功能（抗收縮），因此減少與主體樹脂之接觸面積（使抗 收縮性不易發揮功用）的手段當中，細徑化並不理想，而 要求與過去大致相同直徑，且彎曲半徑小的FRP製抗張 力體之必要性。 本發明是鑒於這種習知問題點而硏創者，其第1目的 在於獲得一種在藉由熱可塑性樹脂將抗張力體整個包覆的 下路光纖電纜當中，尤其具有重量輕，可實現細徑化，而 且適合作爲落線之特性的非金屬型下路光纖電纜。 而第2目的在於提供一種彎曲直徑大，而且不容易折 損的FRP抗張力體。 【發明內容】 爲了達成上述目的，本發明之下路光纖電纜是具有對 於纖維強化熱硬化性樹脂的抗張力體施以熱可塑性樹脂製 (4) 1297788 包覆層的包覆抗張力體；光纖芯線；以及利用熱可塑性樹 脂將前述包覆抗張力體及前述光纖芯線整個包覆的主體包 覆部，其特徵爲：使前述包覆抗張力體外圍與前述主體包 覆部相互地融合接著，使前述包覆層的內圍與前述抗張力 體的外圍錨接。 前述包覆抗張力體可對於以玻璃纖維作爲補強纖維之 外徑爲〇.9mm以下的前述抗張力體，施以0.3mm以下的The bonding strength is about (100 MPa), but the coated surface is not necessarily smooth, and there is a problem that it is difficult to obtain a uniform and small-diameter finished product. Further, the FRP tensile strength-resistant body using such a lower-end optical fiber cable has a technical problem of being large in bending diameter and being easily broken, compared to a metal tensile-resistant body, and it is necessary to reduce the bending diameter which may cause breakage, and it is only necessary to reduce the FRP diameter. However, in the case where the reinforcing fibers are the same, there is a problem that the tension is reduced. In this case, the improvement against the tensile resistance alone can be solved by replacing the reinforcing fiber with a high-strength, high-elasticity form, but it is also required to suppress the shrinkage of the resin which itself constitutes a body which changes with the ambient temperature. Since it has a function (anti-shrinkage), the contact area with the main resin is reduced (the anti-shrinkage is hard to function), the diameter is not ideal, and the FRP strain is required to have substantially the same diameter as in the past and a small bending radius. The necessity of the body. The present invention has been made in view of such a conventional problem, and a first object thereof is to obtain a low-weight optical fiber cable which is entirely covered by a thermoplastic resin by a thermoplastic resin, and can realize a small diameter. It is also suitable as a non-metallic type of optical fiber cable for the characteristics of the drop line. The second object is to provide an FRP tensile body having a large bending diameter and which is not easily broken. SUMMARY OF THE INVENTION In order to achieve the above object, the optical fiber cable of the present invention is a coated tensile strength body having a coating layer of a thermoplastic resin (4) 1297788 for a tensile strength of a fiber-reinforced thermosetting resin; an optical fiber core; And a main body covering portion that covers the coated tensile strength body and the optical fiber core by a thermoplastic resin, wherein the outer periphery of the coated tensile body and the main body covering portion are fused together to form the coating The inner circumference of the layer is anchored to the periphery of the aforementioned tension body. The coated tension-resistant body may be applied to the above-mentioned tensile body having an outer diameter of 补.9 mm or less with glass fibers as the reinforcing fibers, and 0.3 mm or less.
前述包覆層。 前述包覆抗張力體的前述熱可塑性樹脂製包覆層可使 用 LLDPE。 前述包覆抗張力體可將其抽拉力假設爲l〇N/10mm以 上。 前述包覆抗張力體可夾住前述光纖芯線，並在其上下 隔著預定間隔而配置兩條。 前述抗張力體可於補強纖維使用玻璃絲（glass yarnThe aforementioned coating layer. The above-mentioned thermoplastic resin-coated layer coated with the tensile body can be made of LLDPE. The aforementioned coated tensile body can be assumed to have a pulling force of l 〇 N/10 mm or more. The coated tension-resistant body may sandwich the optical fiber core wire and arrange two at a predetermined interval therebetween. The above-mentioned tensile body can use glass yarn for reinforcing fiber (glass yarn)
)0 前述玻璃絲可使用單纖維直徑爲3至13μπι，而且並 未倂捻複數條絲的單絲狀玻璃絲。 而且，本發明提供一種FRP製抗張力體，是利用熱 硬化性樹脂使補強纖維集結，其特徵爲：前述補強纖維的 拉伸彈性率爲3 60cN/dtex以上，且破斷時的伸度爲3.5% 以上。 前述熱硬化性樹脂可爲酸乙烯酯樹脂。 前述FRP製抗張力體可使用在具有對於其外圍施以 -8- (5) 1297788 熱可塑性樹脂製包覆層之包覆抗張力體、以及利用熱可塑 性樹脂將光纖芯線及前述包覆抗張力體整個包覆的主體包 覆部的下路光纖用電纜，並且使前述包覆層的外圍與前述 主體包覆部相互地融合接著，使前述包覆層的內圍與前述 抗張力體的外圍錨接。 前述FRP製抗張力體可形成橢圓或矩形等的扁平剖 面，並且以相對於前述下路光纖用電纜之鋪設時的彎曲方 向使厚度縮小的方式配置。 【實施方式】 以下，針對用以實施本發明的最佳形態，根據實施例 及具體例加以詳細說明。 第1圖是本發明之下路光纖電纜的一個實施例。該圖 所示的下路光纖電纜1具有光纖芯線2、3、包覆抗張力 體6、以及支持線（亦稱懸纜線：messenger wire)。光 纖芯線2、3是在中心上下相臨而配置。 包覆抗張力體6是形成利用熱可塑性樹脂製包覆層5 包覆纖維強化熱硬化性樹脂製（FRP製）抗張力體4的圓 形剖面，並且使一對包覆抗張力體6在光纖芯線2、3的 上下保持預定間隔，並將此夾住而配置於同軸上。 支持線7是配置在一方包覆抗張力體6的上方，光纖 芯線2、3、包覆抗張力體6及支持線7具有藉由熱可塑 性樹脂製主體包覆部8而整個包覆的構成。此外，支持線 7是經由細幅的部分1 0結合而可與其他部分分離。 -9- (6) 1297788 如以上所構成的下路光纖電纜1在使用支持線7架設 於電線桿間，並拉入加入者住家時，首先是切斷細幅部 1 〇使支持線7分離，接下來從缺口 9的部分斷開而取出 光纖芯線2、3，然後使加入者側與芯線2、3連接。 包覆抗張力體6是對於纖維強化熱硬化性樹脂製（ FRP製）抗張力體4施以熱可塑性樹脂製包覆層5者。在 此情況下，FRP製抗張力體4的外圍與包覆層5的內圍是 相互錨接。 爲了能夠錨接，只要利用記載於日本特公昭63 -2772 號的方法，也就是使將補強纖維束浸泡在未硬化的熱硬化 性樹脂而成的未硬化狀補強芯部熔融，然後立刻使該熱可 塑性樹脂的包覆層冷卻固化之後，將其導入加壓高溫蒸氣 的硬化槽，使補強芯部與該包覆層的交界部分以軟化、流 動狀態接觸’同時加熱該熱硬化性樹脂使其硬化，接下來 使包覆熱可塑性樹脂冷卻而使纖維強化熱硬化性樹脂（ FRP )構成的芯部交界與包覆熱可塑性樹脂錨接即可。 就可使用在本發明當中的補強纖維而言，一般是各種 玻璃纖維、芳族聚胺纖維、碳纖維等，可依所要求的拉 伸強度及彈性率來選擇。 使用玻璃纖維的情況下，爲了使FRP製抗張力體4 的直徑縮小至〇.9mm以下，最好是玻璃絲，雖可根據所 要求的性能從E、S、T等的玻璃纖維選擇，但從經濟面 考量，建議採用E玻璃。 就玻璃絲而言，構成的單纖維直徑爲3至1 3 μπι，以 -10- 1297788 (7) 未倂捻複數條絲的單絲狀爲佳，可使用1 1 . 2至6 7.5 Tex。 在此情況下，使用支數大，也就是超過67.5 Tex的玻 璃絲時，對於作爲FRP時的真圓度會有不好的影響，在 之後利用熱可塑性樹脂的薄壁包覆成形步驟當中，便不易 進行均一的包覆。另一方面，市面上雖然也有販賣 11. 2 Tex以下的絲，但步驟較爲繁雜，還會導致成本提高 ，並不經濟。 選擇玻璃絲是因爲對絲進行過例如1個/英吋等的捻 轉，因此在熱硬化性樹脂的浸泡或擠壓步驟當中，玻璃單 纖維的紊亂或鬆弛、糾結情況較少，而可獲得外圍均一的 未延伸棒狀物。 抗張力體4的玻璃纖維之體積含量可依所要求的物性 決定，但在以更細徑化爲目的之本案發明當中，最好是大 約60至70VOL%左右。 另外，可使用在本發明的熱硬化性樹脂一般爲對苯二 甲酸系或間苯二甲酸系的不飽和聚酯樹脂、乙烯酯樹脂或 環氧樹脂等，且可在這些添加硬化用觸媒等來使用。 未硬化狀補強芯部之包覆層5所使用的熱可塑性樹脂 可從與主體包覆部8之熱可塑性樹脂具有相熔性的樹脂選 擇，在主體包覆部8使用難燃性樹脂的情況下，爲了提升 與該樹脂的相熔性，最好使用接著性樹脂或是添加接著性 樹脂的主膠料，又亦可配合主體包覆部8的顏色，添加上 色用主膠料來上色。 而且，包覆層5所使用的熱可塑性樹脂亦可配合主體 -11 - 1297788 (8) 包覆部8的難燃化而施以爲了賦予其難燃性的各種變性。 再者’包覆層5所使用的熱可塑性樹脂爲了獲得與FRP 抗張力體4的錨接構造，最好是在加熱熱硬化性樹脂使其 硬化時，至少內圍會呈現熔融狀或軟化狀態，以在硬化溫 度1 1 0至1 5 0 °C的範圍具有熔點或軟化點的聚烯系樹脂更 爲合適。 另外，包覆抗張力體6在以玻璃絲作爲補強纖維的情 況下’從耐曲性及細徑化的觀點來看，最好是外徑爲 0.9mm以下的纖維強化熱硬化性樹脂硬化物，同樣爲了實 現細徑化、以及主體樹脂又要求難燃性，所需以上的包覆 厚度就會成爲難燃性的妨礙主因，因此包覆層5最好在 0 · 3 mm以下。 再者，包覆層5的厚度爲了實現細徑化，最好在整形 後爲0.07至0.2mm左右的厚度，爲了實現這種薄膜化， 最好是薄膜成形性佳的樹脂，例如以低密度聚乙烯LDPE )、直鏈狀低密度聚乙烯（LLDPE )等較爲合適。 使用LLDPE的情況下，又最好使用具有以下特性的 LLDPE。所謂該特性是根據JIS K6760的MFR爲1至 4g/10min、密度 0.920 至 0.940g/cm3、根據 JIS Z1702 的 拉伸試驗當中，拉伸強度爲30MPa以上、1 %絕對値具有 150至2 5 0MPa之範圍的値。 本發明之下路光纖電纜所使用的包覆抗張力體6以抗 張力體4自包覆層5所使用的熱可塑性樹脂的抽拉力爲 10N/10mm以上較爲合適。 •12- 1297788 (9) 此抽拉力是作爲錨接構造之密接力的指標，並藉由以 下測定方法測定。 準備一個安裝有直徑比FRP芯部之外徑稍大之穿透 孔的測定治具1 1的試驗機，另一方面使包覆抗張力體6 之端部的包覆層5剝離，接下來於包覆層5藉由剃刀施以 10mm長的刻線，而準備好殘留有l〇mm長度之包覆層5 的樣本S。樣本S是如第2圖所示，插通於試驗機的穿透 孔，並以50mm/分鐘的速度施以拉力荷重，然後從該紀錄 求出抽拉力。 第4圖及第5圖是本發明之FRP製抗張力體及使用 同抗張力體的下路光纖電纜之一實施例。這些圖面所示的 下路光纖電纜la具有光纖芯線2a、包覆抗張力體6a、及 支持線（懸纜線）7a。 包覆抗張力體6a是形成利用熱可塑性樹脂製包覆層 5a包覆纖維強化熱硬化性樹脂製抗張力體4a的扁平角形 剖面，並且使一對包覆抗張力體6a在光纖芯線2a的上下 保持預定間隔，並將此夾住而配置於同軸上。 支持線7a是配置在一方包覆抗張力體6a的上方，光 纖芯線2a、包覆抗張力體6a及支持線7a具有藉由熱可 塑性樹脂製主體包覆部8a而整個包覆的構成。在主體包 覆部8a之對應於光纖芯線2a兩側的位置形成有相對向的 一對缺口 9 a。 另外，在支持線7a的外圍設有圓形的主體包覆部8a ’支持線7a是藉由細幅部1 〇a連結而可與其他部分分離 -13- 1297788 (10) 如以上方式構成的下路光纖電纜1 a在使用支持線7 a 架設於電線桿間，並拉入加入者住家時，首先是如第5圖 所示’切斷細幅部1 〇 a使支持線7 a分離，接下來從缺口 9 a的部分斷開而取出光纖芯線2 a，然後連接加入者側及 芯線2 a。 本實施例的情況下，包覆抗張力體6a是對於纖維強 化熱硬化性樹脂製（以下稱爲FRP。）抗張力體4a施以 熱可塑性樹脂製包覆層5a者。 在此情況下，抗張力體4a的補強纖維是從例如芳族 聚 胺纖維、聚芳酯纖維、聚苯撐苯並二噁唑（PBO )纖 維等當中，適當選擇拉伸彈性率在3 60cN/dtex以上，且 破斷時的伸度在3.5%以上的纖維。 另外，在此情況下，拉伸彈性率在3 6 0 c N / d t e X以下 時，並無法獲得足夠用來保護光纖芯線2a的抗張力，而 無法發揮其功能。 而破斷時的伸度在3.5 %以下時，FRP會變得不易彎 曲，而不易縮小下路光纖電纜化時的彎曲半徑。 亦即，連續使用容許彎曲半徑會變大，以致在鋪設時 不得不以大的彎曲半徑鋪設。（間接而言，最小彎曲直徑 小較能縮小鋪設時的彎曲半徑{直徑})更理想的情況是拉 伸彈性率在480cN/dtex以上。 就所要使用的補強纖維而言，以構成的單纖維徑爲 1 〇至1 5 μηι，且並未倂捻複數條絲的所謂多絲纖維狀者爲 -14- 1297788 (11) 佳，可使用500至3500dtex。 在此情況下，使用支數大，也就是超過3 5 00dtex的 補強纖維時，對於作爲FRP時的真圓度會有不好的影響 ，在之後利用熱可塑性樹脂的薄壁包覆成形步驟當中便不 易進行均一的包覆。 而且，單絲的倂絲會變得不佳，而有可能在FRP化 時，使拉伸性能變得不夠充分。另一方面，市面上也有販 售5 00 dt ex以下的絲，但步驟較爲繁雜，還會導致成本上 升，並不經濟。 另外，可使用在本發明之補強纖維之結著的熱硬化性 樹脂一般爲樹脂等，雖可在這些添加硬化用觸媒等來使用 ，但從耐熱性等的物性來看，最好是對苯二甲酸系或間苯 二甲酸系的不飽和聚酯樹脂、乙烯酯樹脂（環氧丙烯酸酯 樹脂等）或環氧樹脂等，且可在這些添加硬化用觸媒等來 使用，但從耐熱性等的物性看來，尤其以乙烯酯樹脂（環 氧丙烯酸酯樹脂等）爲佳。 未硬化狀補強芯部的包覆層5 a所使用的熱可塑性樹 脂可從與主體包覆部8a的熱可塑性樹脂具有相熔性的樹 脂選擇，在主體包覆部8a使用難燃性樹脂的情況下，爲 了提升與該樹脂的相熔性，最好使用接著性樹脂、或是添 加接著性樹脂的主膠料，又亦可配合主體包覆部的顏色， 添加上色用主膠料來上色。 另外，包覆層5 a所使用的熱可塑性樹脂亦可配合主 體包覆部8a的難燃化而施以爲了賦予其難燃性的各種變 -15- 1297788 (12) 性。再者，包覆層5 a所使用的熱可塑性樹脂爲了獲得與 FRP部的錨接構造，最好是在加熱熱硬化性樹脂使其硬化 時，至少內圍會呈現熔融狀或軟化狀態，以在硬化溫度 1 1 0至1 5 0 °C的範圍具有熔點或軟化點的聚烯系樹脂較爲 合適。 另外，FRP部在以玻璃絲作爲補強纖維的情況下，從 耐彎曲性及細徑化的觀點來看，最好是外徑爲0.9mm以 下的纖維強化熱硬化性樹脂硬化物（更理想爲0.6mm以 下），同樣從細徑化的觀點、以及不賦予包覆層5 a難燃 性的情況，而主體樹脂要求難燃性的情況下，所需以上的 包覆厚度會成爲難燃性的妨礙主因，因此包覆層5a最好 在0.3 mm以下。 再者，包覆層5a的厚度在整徑前的包覆厚度以 0.0 8mm以上爲佳，爲了實現細徑化，又最好藉由對於表 面層進行整徑而形成0.07至0.2mm左右的厚度。 爲了使整徑前的包覆厚度薄膜化，最好是薄膜成形性 佳的樹脂，例如以低密度聚乙烯（LDPE )、直鏈狀低密 度聚乙烯（LLDPE )等較爲合適。 本發明之FRP製包覆抗張力體6a的形狀並未特別限 定，可形成橢圓或矩形等的扁平剖面，尤其在鋪設下路光 纖電纜1時，相對於彎曲方向（第4圖當中的上下方向） 縮小FRP製抗張力體4a的厚度而配置（參照第4、5圖 )，以更爲縮小彎曲半徑，並且更爲提高鋪設性。 第6圖是本發明之FRP製抗張力體及使用同抗張力 •16- (13) 1297788 體的下路光纖電纜的其他實施例，在與上述實施例相 相當的部分附上同一數字而省略其說明，而且以下僅 其特徵點加以詳述。 該圖所示的光纖電纜lb具有光纖芯線2b、包覆 力體6b、及支持線7b。包覆抗張力體6b是形成利用 塑性樹脂製包覆層5b包覆纖維強化熱硬化性樹脂製 力體4b的圓形剖面，並且使一對包覆抗張力體6b在 芯線2b的上下保持預定間隔，並且將此夾住而配置 軸上。 支持線7b是配置在一方包覆抗張力體6b的上方 纖芯線2b、包覆抗張力體6b及支持線7b具有藉由 塑性樹脂製主體包覆部8b而整個包覆的構成。此外 主體包覆部8b之對應於光纖芯線2b兩側的位置形成 對向的一對缺口 9 b。 另外，在支持線7b的外圍設有圓形的主體包覆彳 ，支持線7b是藉由細幅部1 Ob連結而可與其他部分 ，這種構成與上述實施例實際上是相同的。 就抗張力體4b的補強纖維而言，是從例如芳族 胺纖維、聚芳酯纖維、聚苯撐苯並二噁唑（PBO )纖 當中，選擇拉伸彈性率爲3 60cN/dtex以上，並且破 的伸度爲3 · 5%以上者。如上述構成的實施例也可獲 上述實施例同等的作用效果。 以下，針對本發明之更爲具體的實施例加以說明 本發明並不限定於下述實施例。 同或 針對 抗張 熱可 抗張 光纖 於同 ，光 熱可 ，在 有相 那8b 分離 聚 維等 斷時 得與 ，但 •17- 1297788 (14) 具體例1 在添加了熱應化性觸媒於乙烯酯樹脂（三井化學社製 :Η 8 1 0 0 )的樹脂浸泡槽中，經由導件導入九條單絲徑 ΙΟμπι、22.5Tex的 E玻璃絲（日東紡織社製：E C E N 2 2 5 1/0 1.0ZR)，接下來導入使內徑階段性縮小的擠壓噴嘴 而擠壓形成未硬化狀樹脂，並獲得外徑爲〇.4mm的細徑 棒狀物，使此通過熔融擠出機的交叉頭模具（200 t )， 利用添加了黑色主膠料的 ΜΙ = 2·4、密度 〇.921g/cm3、 30μπι之擠鑄薄膜的1%絕對値爲170MPa的LLDPE樹脂（ 曰本Unicar社製：TUF2060)，以包覆厚度0.21mm包覆 成環狀，並且立刻導入冷卻水槽，使表面的包覆部冷卻固 化。 接下來，將此包覆未硬化線狀物導入於入口及出口設 有加壓密封部的加壓蒸氣硬化槽，並以蒸氣壓23.5P a使 其硬化，然後導入具有已加熱至265 °C之內徑0.93mm及 0.70mm之整形鑄模的整形器而對於包覆外圍面進行整形 ，並獲得包覆外徑〇.7nim的包覆抗張力體6，並且在繞線 管捲繞成連續狀。 此包覆抗張力體6的玻璃纖維含量爲63.5 VOL%，使 用第 2圖所示的測定治具11測量出來的抽拉力爲 12N/10mm。另外，在80°C熱間的24小時耐熱彎曲直徑 測試當中是淸除30mm，以樣本長度i〇〇〇mm反覆三次-30 。(：至80 °C的熱循環測試，並且觀察包覆抗張力體6的包 -18- 1297788 (15) 覆層5與抗張力體4的接著狀況，但幾乎從未發生包覆層 5的收縮。 以改變包覆抗張力體6在製造時之硬化溫度時的抽拉 力、耐熱彎曲性作爲實施例，整理後顯示於以下表1。 使用此包覆抗張力線，並利用以下方法製造出第1圖 所示之構成的下路光纖電纜1。0) The above-mentioned glass filament may be a monofilament-shaped glass filament having a single fiber diameter of 3 to 13 μm and not having a plurality of filaments. Further, the present invention provides a FRP tensile strength body in which a reinforcing fiber is aggregated by a thermosetting resin, wherein the reinforcing fiber has a tensile modulus of 3 60 cN/dtex or more and an elongation at break of 3.5. % the above. The thermosetting resin may be an acid vinyl ester resin. The FRP tensile strength-resistant body may be used by coating a tensile-resistant body having a coating layer of -8-(5) 1297788 thermoplastic resin applied to the periphery thereof, and coating the optical fiber core wire and the aforementioned coated tensile-resistance body with a thermoplastic resin. The lower-side optical fiber cable of the covered main body covering portion is formed by fusing the outer periphery of the coating layer and the main body covering portion, and the inner circumference of the coating layer is anchored to the outer periphery of the tension-resistant body. The FRP tensile strength-resistant body can be formed into a flat cross section such as an ellipse or a rectangle, and is disposed so as to be reduced in thickness in a curved direction in the laying of the cable for the lower optical fiber. [Embodiment] Hereinafter, the best mode for carrying out the invention will be described in detail based on examples and specific examples. Figure 1 is an embodiment of the underlying fiber optic cable of the present invention. The drop fiber optic cable 1 shown in the figure has an optical fiber core 2, 3, a coated tensile body 6, and a support wire (also called a messenger wire). The optical core wires 2 and 3 are disposed adjacent to each other in the center. The coated tension-resistant body 6 is formed into a circular cross section in which a tensile-resistant body 4 made of a fiber-reinforced thermosetting resin (made of FRP) is coated with a coating layer 5 made of a thermoplastic resin, and a pair of coated tensile-resistant bodies 6 are formed on the optical fiber core 2 The upper and lower sides of 3 are kept at a predetermined interval, and are sandwiched and placed on the coaxial line. The support wire 7 is disposed above one of the coated tensile strength bodies 6, and the optical fiber core wires 2, 3, the coated tensile strength body 6, and the support wire 7 are entirely covered by the main body coating portion 8 made of a thermoplastic resin. Further, the support line 7 is separated from the other portions by the combination of the thin portions 10. -9- (6) 1297788 The lower optical fiber cable 1 constructed as above is placed between the utility poles using the support wire 7 and pulled into the home of the subscriber. First, the thin portion 1 is cut and the support line 7 is separated. Next, the optical fiber core wires 2, 3 are taken out from the portion of the notch 9, and then the subscriber side is connected to the core wires 2, 3. The coated tensile body 6 is a thermoplastic resin-coated layer 5 which is made of a fiber-reinforced thermosetting resin (made of FRP). In this case, the periphery of the FRP tensile body 4 and the inner circumference of the coating 5 are anchored to each other. In order to be able to be anchored, the uncured reinforcing core portion obtained by immersing the reinforcing fiber bundle in an uncured thermosetting resin is melted by the method described in Japanese Patent Publication No. Sho 63-2772, and then immediately After the coating layer of the thermoplastic resin is cooled and solidified, it is introduced into a hardened tank of pressurized high-temperature steam, and the boundary portion between the reinforcing core portion and the coating layer is brought into contact with a softened and fluidized state to simultaneously heat the thermosetting resin. After the curing, the coated thermoplastic resin is cooled to bond the core portion of the fiber-reinforced thermosetting resin (FRP) to the coated thermoplastic resin. As the reinforcing fibers which can be used in the present invention, generally, various glass fibers, aromatic polyamine fibers, carbon fibers and the like can be selected depending on the required tensile strength and elastic modulus. When glass fiber is used, in order to reduce the diameter of the FRP tensile strength body 4 to 〇.9 mm or less, it is preferably a glass fiber, and it can be selected from glass fibers such as E, S, and T according to the required performance, but economical. For the consideration of the surface, it is recommended to use E glass. In the case of glass filaments, the single fiber diameter is 3 to 13 μπι, preferably -10- 1297788 (7), and the monofilament of the plurality of filaments is preferably used, and 11.2 to 6 7.5 Tex can be used. In this case, when a glass having a large count, that is, more than 67.5 Tex, is used, it has a bad influence on the roundness at the time of FRP, and then a thin-wall cladding forming step using a thermoplastic resin is followed. It is not easy to carry out uniform coating. On the other hand, although the market has sold the yarn below 11. 2 Tex, the steps are more complicated, which will lead to higher costs and is not economical. The glass filament is selected because the filament is subjected to, for example, 1/inch, etc., so that during the soaking or pressing step of the thermosetting resin, the glass single fiber is less disordered or slackened and entangled, and the periphery can be obtained. Uniform unstretched rods. The volume content of the glass fiber of the tension-resistant body 4 can be determined depending on the desired physical properties, but it is preferably about 60 to 70 VOL% in the present invention for the purpose of making the diameter smaller. Further, the thermosetting resin to be used in the present invention is generally a terephthalic acid-based or isophthalic acid-based unsaturated polyester resin, a vinyl ester resin, an epoxy resin, or the like, and these additives for curing can be added thereto. Wait to use. The thermoplastic resin used for the coating layer 5 of the uncured reinforcing core portion can be selected from a resin having a phase melting property with the thermoplastic resin of the main body covering portion 8, and a flame retardant resin is used for the main body covering portion 8. In order to improve the phase melting property with the resin, it is preferable to use an adhesive resin or a main rubber to which an adhesive resin is added, or to add a main coloring material to the color of the main body coating portion 8. color. Further, the thermoplastic resin used for the coating layer 5 may be subjected to various denaturations for imparting flame retardancy to the flame-insulating portion of the main body -11 - 1297788 (8). Further, in order to obtain the anchoring structure with the FRP tensile body 4, the thermoplastic resin used in the coating layer 5 preferably has a molten or softened state when the thermosetting resin is heated and hardened. A polyolefin resin having a melting point or a softening point in the range of a curing temperature of from 1 10 to 150 ° C is more suitable. In the case where the glass fiber is used as the reinforcing fiber, the coated tensile-resistance body 6 is preferably a fiber-reinforced thermosetting resin cured product having an outer diameter of 0.9 mm or less from the viewpoint of resistance to curvature and diameter reduction. In order to achieve the reduction in the diameter and the flame retardancy of the main resin, it is necessary to prevent the above-mentioned coating thickness from being the main cause of the flame retardancy. Therefore, the coating layer 5 is preferably 0·3 mm or less. Further, in order to achieve a reduction in the thickness of the coating layer 5, it is preferably a thickness of about 0.07 to 0.2 mm after the shaping, and in order to achieve such a film formation, a resin having a good film formability is preferable, for example, at a low density. Polyethylene LDPE), linear low density polyethylene (LLDPE), etc. are suitable. In the case of using LLDPE, it is preferable to use LLDPE having the following characteristics. This characteristic is based on JIS K6760, MFR of 1 to 4 g/10 min, density of 0.920 to 0.940 g/cm3, tensile test according to JIS Z1702, tensile strength of 30 MPa or more, and 1% absolute enthalpy of 150 to 250 MPa. The scope of the scope. The coated tensile strength body 6 used in the optical fiber cable of the present invention is preferably a tensile force of 10 N/10 mm or more for the thermoplastic resin used for the tensile layer 4 from the coating layer 5. • 12- 1297788 (9) This pulling force is an indicator of the adhesion of the anchoring structure and is determined by the following measurement method. A test machine for mounting the measuring jig 1 1 having a diameter larger than the outer diameter of the FRP core portion is prepared, and on the other hand, the coating layer 5 covering the end portion of the tensile body 6 is peeled off, and then The coating layer 5 was prepared by applying a scribe line of 10 mm long by a razor, and a sample S having a coating layer 5 having a length of 10 mm was prepared. The sample S was inserted into the penetration hole of the testing machine as shown in Fig. 2, and the tensile load was applied at a speed of 50 mm/min, and then the drawing force was obtained from the record. Fig. 4 and Fig. 5 show an embodiment of the FRP tensile strength body of the present invention and a lower optical fiber cable using the same tensile strength. The lower optical fiber cable la shown in these figures has an optical fiber core 2a, a coated tensile strength body 6a, and a support wire (suspension cable) 7a. The coated tensile-resistance body 6a is a flat-angled cross-section that forms a tensile-resistant body 4a made of a fiber-reinforced thermosetting resin coated with a coating layer 5a made of a thermoplastic resin, and holds a pair of coated tensile-resistance bodies 6a on the upper and lower sides of the optical fiber core 2a. Interval, and clamp this to be placed on the coaxial. The support wire 7a is disposed above one of the coated tensile strength bodies 6a, and the optical fiber core 2a, the coated tensile strength body 6a, and the support wire 7a are entirely covered by the main body coating portion 8a made of a thermoplastic resin. A pair of opposed notches 9a are formed at positions on both sides of the main body covering portion 8a corresponding to the optical fiber core 2a. Further, a circular main body covering portion 8a is provided on the outer periphery of the support wire 7a. The support wire 7a is separated from the other portions by the thin portion 1 〇a. -13297788 (10) When the support fiber line 1a is placed between the utility poles and pulled into the home of the subscriber, the first step is to cut off the support portion 7a by cutting the thin portion 1 〇a as shown in Fig. 5 Next, the optical fiber core 2a is taken out from the portion of the notch 9a, and then the subscriber side and the core 2a are connected. In the case of the present embodiment, the coated tensile-resistance body 6a is a thermoplastic resin-coated layer 5a which is made of a fiber-reinforced thermosetting resin (hereinafter referred to as FRP). In this case, the reinforcing fiber of the tensile body 4a is selected from, for example, an aromatic polyamine fiber, a polyarylate fiber, a polyphenylene benzobisoxazole (PBO) fiber, etc., and a tensile modulus of 3 60 cN/ is appropriately selected. A fiber having a dtex or more and an elongation of 3.5% or more at the time of breaking. Further, in this case, when the tensile modulus is 3 0.000 c N / d t e X or less, the tensile strength sufficient to protect the optical fiber core 2a cannot be obtained, and the function cannot be exerted. When the elongation at break is less than 3.5%, the FRP becomes difficult to bend, and it is not easy to reduce the bending radius when the fiber is cabled. That is, the continuous use allows the bending radius to become large, so that it has to be laid with a large bending radius at the time of laying. (Indirectly, the minimum bending diameter is smaller than the bending radius {diameter} at the time of laying). More preferably, the tensile modulus is 480 cN/dtex or more. For the reinforcing fiber to be used, the so-called multifilament fiber which has a single fiber diameter of 1 〇 to 15 μηι and which does not have a plurality of filaments is preferably -14-297788 (11), and can be used. 500 to 3500 dtex. In this case, when a reinforcing fiber having a large count, that is, more than 3,500 dtex, is used, it has a bad influence on the roundness at the time of FRP, and is then subjected to a thin-wall coating forming step using a thermoplastic resin. It is not easy to carry out uniform coating. Moreover, the filaments of the monofilament may become poor, and it is possible to make the tensile properties insufficient when FRP is formed. On the other hand, there are also silks of less than 500 dt ex sold on the market, but the steps are complicated and the cost is increased, which is not economical. In addition, the thermosetting resin to be used in the reinforcing fiber of the present invention is generally a resin or the like, and may be used in these addition-hardening catalysts, etc., but it is preferable from the viewpoint of physical properties such as heat resistance. A phthalic acid-based or isophthalic acid-based unsaturated polyester resin, a vinyl ester resin (such as an epoxy acrylate resin), an epoxy resin, or the like, and may be used in these addition-hardening catalysts, etc., but from heat resistance. It is preferable that the physical properties such as properties are, in particular, a vinyl ester resin (epoxy acrylate resin or the like). The thermoplastic resin used for the coating layer 5 a of the uncured reinforcing core portion can be selected from a resin having a phase melting property with the thermoplastic resin of the main body covering portion 8 a, and a flame retardant resin is used for the main body covering portion 8 a. In order to improve the phase melting property with the resin, it is preferable to use an adhesive resin or a main rubber to which an adhesive resin is added, or to add a main coloring material to the color of the main body coating portion. Coloring. In addition, the thermoplastic resin used for the coating layer 5a may be subjected to various types of -15-1297788 (12) properties in order to impart flame retardancy to the main body covering portion 8a. Further, in order to obtain the anchoring structure with the FRP portion, the thermoplastic resin used in the coating layer 5a preferably has a molten or softened state when the thermosetting resin is heated and hardened. A polyolefin-based resin having a melting point or a softening point in the range of a curing temperature of from 1 10 to 150 ° C is suitable. In the case where the glass fiber is used as the reinforcing fiber, the FRP portion is preferably a fiber-reinforced thermosetting resin cured product having an outer diameter of 0.9 mm or less (more preferably 0.6) from the viewpoint of bending resistance and diameter reduction. In the case of the diameter reduction, and the case where the coating layer 5 a is not provided with flame retardancy, and the main resin is required to have flame retardancy, the required coating thickness may become flame retardant. The main cause is hindered, so the coating layer 5a is preferably 0.3 mm or less. Further, the thickness of the coating layer 5a before the full diameter is preferably 0.08 mm or more, and in order to achieve the diameter reduction, it is preferable to form a thickness of about 0.07 to 0.2 mm by performing a full diameter on the surface layer. . In order to reduce the thickness of the coating before the entire diameter, a resin having excellent film formability is preferable, and for example, low density polyethylene (LDPE) or linear low density polyethylene (LLDPE) is suitable. The shape of the FRP coated tensile strength body 6a of the present invention is not particularly limited, and a flat cross section such as an ellipse or a rectangle may be formed, especially when the lower optical fiber cable 1 is laid, with respect to the bending direction (up and down direction in FIG. 4). The thickness of the FRP tensile strength-resistant body 4a is reduced and arranged (see FIGS. 4 and 5) to further reduce the bending radius and to improve the layability. Fig. 6 is a view showing another embodiment of the FRP tension-resistant body of the present invention and a lower-end optical fiber cable using the same strain-resistant 16-(13) 1297788 body, and the same reference numerals are attached to the same portions as the above-described embodiment, and the description thereof is omitted. And the following only its feature points are detailed. The optical fiber cable 1b shown in the figure has an optical fiber 2b, a covering body 6b, and a supporting wire 7b. The coated tensile-resistance body 6b is formed into a circular cross section in which the fiber-reinforced thermosetting resin-made body 4b is coated with the plastic resin coating layer 5b, and the pair of coated tensile-resistance bodies 6b are held at a predetermined interval above and below the core wire 2b. And clamp this to configure the shaft. The support wire 7b is disposed so that the core wire 2b, the coated tensile-resistance body 6b, and the support wire 7b which are disposed on one of the coated tensile-resistance bodies 6b are entirely covered by the plastic resin main body covering portion 8b. Further, the position of the main body covering portion 8b corresponding to both sides of the optical fiber core 2b forms a pair of opposing notches 9b. Further, a circular main body wrapping rim is provided on the outer periphery of the support wire 7b, and the support wire 7b is connected to the other portion by the thin portion 1 Ob. This configuration is substantially the same as that of the above embodiment. The reinforcing fiber of the tensile body 4b is selected from, for example, an aromatic amine fiber, a polyarylate fiber, and a polyphenylene benzobisoxazole (PBO) fiber, and has a tensile modulus of 3 60 cN/dtex or more. Broken elongation is more than 3 · 5%. The embodiment constructed as described above can also obtain the same operational effects as those of the above embodiment. Hereinafter, the present invention is not limited to the following examples. Same as or for the tensile heat-resistant tensile fiber, the light and heat can be obtained when there is a phase separation of 8b, but 17- 1297788 (14) Specific Example 1 Adding a heat-resistant catalyst In the resin soaking tank of vinyl ester resin (manufactured by Mitsui Chemicals Co., Ltd.: Η 8 1 0 0), nine E-glass filaments of monofilament diameter ΙΟμπι and 22.5Tex were introduced via guides (made by Ridong Textile Co., Ltd.: ECEN 2 2 5 1/ 0 1.0ZR), followed by introduction of an extrusion nozzle which gradually reduced the inner diameter to form an uncured resin, and obtained a small-diameter rod having an outer diameter of 〇.4 mm, which was passed through a melt extruder. Cross-head mold (200 t ), LLDPE resin with 1% absolute 値 170 MPa of extruded film with 黑色 = 2·4, density 〇.921g/cm3, 30μπι added with black master compound (made by Uni本Unicar) : TUF2060), wrapped in a ring shape with a coating thickness of 0.21 mm, and immediately introduced into a cooling water tank to cool and solidify the coated portion of the surface. Next, the coated uncured wire is introduced into a pressurized steam hardening tank having a pressure sealing portion at the inlet and the outlet, and is hardened by a vapor pressure of 23.5 Pa, and then introduced to have a heating to 265 ° C. The shaping tool of the shaping mold having an inner diameter of 0.93 mm and 0.70 mm was shaped to cover the outer peripheral surface of the coating, and a coated tensile body 6 having an outer diameter of 77 nim was obtained, and wound in a continuous shape in the bobbin. The glass fiber content of the coated tensile body 6 was 63.5 VOL%, and the pulling force measured by the measuring jig 11 shown in Fig. 2 was 12 N/10 mm. In addition, in the 24-hour heat-resistant bending diameter test between the heats of 80 ° C, 30 mm was removed, and the sample length i 〇〇〇 mm was repeated three times - 30 . (: Thermal cycle test up to 80 °C, and the subsequent condition of the coating -18- 1297788 (15) covering the tensile-resistant body 6 with the tensile-resistant body 4 was observed, but the shrinkage of the coating layer 5 almost never occurred. The drawing force and the heat-resistant bending property at the time of hardening of the coating tension-resistant body 6 at the time of manufacture were used as an Example, and it is shown in the following Table 1 after finishing. The coating method was used, and the 1st figure was manufactured by the following method. The lower optical fiber cable 1 is constructed.
支持線7是外徑1 .2mm的鋼線，並且使用0 〇.25mm 的光纖芯線2、3及兩條上述包覆抗張力體6，將這些以 預定間隔配置而插通於十字頭模具，然後以難燃性聚乙烯 樹脂形成主體包覆部8，而獲得在中央部具有缺口 9的下 路光纖電纜1。The support wire 7 is a steel wire having an outer diameter of 1.2 mm, and the optical fiber core wires 2, 3 and two of the above-mentioned coated tensile strength bodies 6 of 0 〇.25 mm are used, and these are arranged at predetermined intervals to be inserted into the crosshead mold, and then The main body covering portion 8 is formed of a flame retardant polyethylene resin, and a lower optical fiber cable 1 having a notch 9 at the center portion is obtained.
利用第3圖所示的測定系統的抽拉試驗機來測定所獲 得的下路光纖電纜1的抽拉特性。第3圖當中，符號1是 作爲試驗對象的下路光纖電纜，1 2、1 3、1 4是牽引線， 15是插通光纖電纜1的彎管，且是以R3 00 mm的曲率彎 曲。符號1 6是經由牽引線1 2，將預定荷重施加於光纖電 纜1的重錘。 使用此試驗機，反覆五次荷重3 4.3 N、抽拉長度1 m 、溫度條件從-30 °C到+80 °C的熱循環，並測定波長 1 5 5 Onm之光源下的傳輸損失。將測定結果整理後顯示於 以下表2。 在利用具體例1之包覆抗張力體6試作的下路光纖電 纜1並未看見各包覆層的收縮。 -19- 1297788 (16) 具體例2、3 除了在具體例1當中，將加壓蒸氣碌 設爲 15.7Pa(具體例 2) 、32.4Pa (具 1 25 °C及145 °C的硬化槽內溫度進行硬化 具體例1相同而獲得包覆抗張力線。 所獲得的包覆抗張力線的抽拉力爲1 、15N/10mm (具體例3 )，在80°C熱間E 曲直徑測試當中皆淸除了 30mm。 使用具體例2、3的包覆抗張力線， 製作出下路光纖電纜，但所獲得的下路光 驗中的傳輸損失並沒有增加，在熱循環I! 沒有增加。 比較例1 除了在具體例1當中，將加壓蒸氣ΐ 設爲8.8Pa，將硬化槽內溫度假設爲11 外，其餘皆與具體例1同樣而獲得包覆ί 的包覆抗張力體的抽拉力爲7Ν/10mm， 8 0 °C的24小時耐熱彎曲試驗當中，所巧 3 0 m m直徑並無法淸除。 比較例2 在具體例1當中，於未硬化細徑棒取 用密度 〇.928g/cm3、MFR1 .3g/l Omin、拉 :化槽的蒸氣壓假 體例3 ) ’並以 以外，其餘皆與 1 .3 (具體例2 ) 勺2 4小時耐熱彎 與具體例1同樣 纖電纜之抽拉試 試的傳輸損失也 ^化槽的蒸氣壓假 5 °C而進行硬化以 [張力體。所獲得 在30mm直徑之 「樣本都會折損， 物的包覆樹脂使 伸強度 1 8Mpa、 -20- 1297788 (17) 1%絕對値340Mpa的LLDPE樹脂（日本Unicar製NUCG-5350)，以包覆厚度〇.21mm包覆成環狀’並且立刻導入 冷卻水槽，使表面的包覆部冷卻固化。 接下來，將此包覆未硬化線狀物導入於入口及出口設 有加壓密封部的加壓蒸氣硬化槽，並以蒸氣壓23.5 Pa進 行硬化，然後導入具有已加熱至265 °C之內徑〇.93mm及 0.70mm之整形鑄模的整形器而對於包覆外圍面進行整形 ，並獲得包覆外徑0.7mm的包覆抗張力體6’並且在繞線 管捲繞成連續狀。 所獲得的包覆抗張力體會有部分由於插銷孔所產生包 覆的硬化不良部，因而無法滿足作爲抗張力體的物性。 比較例3、4 除了取代具體例1之22.5Tex的玻璃絲而使用三條 67.5Tex的玻璃絲（比較例3 )、三條將三條之各捻絲爲 22.5 Tex絲倂捻的絲（比較例4)以外，其餘皆與具體例1 同樣而獲得包覆抗張力體。 所獲得的包覆抗張力體在FRP部的剖面，玻璃纖維 並未均等地分散，而是呈飯糰狀，真圓度差，一旦彎曲就 會有方向性，並無法用來作爲抗張力體。 尤其，使用將三條倂捻的絲的比較例4當中，在不飽 和聚酯樹脂的浸泡步驟當中，倂捻的絲會解開，在絲簡會 發生長度不均，並產生毛球等。因此，在熱可塑性樹脂的 包覆步驟會產生插銷孔，硬化後會在局部產生硬化不良的 部分。 -21 - 1297788 (18) 而且，所獲得的包覆抗張力體之FRP的外圍並不均 一，整形後的包覆厚度在0.7 0的直徑並不均一，局部還 會露出FRP部，並不適合作爲抗張力體。 這應該是因爲在預定尺寸，本比較例爲外徑 0.4mm 內，玻璃纖維的分散容易變得不夠充分且不均一所導致。 表1 包覆密接力 耐熱彎曲直徑 熱循環-30°C—80°C (N/cm) 80°C24 小時 30mm 0 三個週期 測試5條 收縮率（％) 具體例1 12 5/5 OK 0 具體例2 11.3 5/5 OK 0 具體例3 15 5/5 OK 0 比較例1 7 0/5 NG 0 - 表2 抽拉特性 熱循環- 30°C — 80°c 五個週期 具體例1 良 良 具體例2 良 具體例3 '--— 良 比較例1 不良 Χκ 不良 '— 註··將傳輸損失 0.3dB/km以卞設定爲良 -22- 1297788 (19) 從以上的具體例及比較例可明白，本發明之下路光纖 電纜是利用熱可塑性樹脂，將對於纖維強化熱硬化性樹脂 硬化物製抗張力體施以熱可塑性樹脂包覆層的包覆抗張力 體、以及光纖芯線一起主體包覆，並且具有包覆抗張力體 外圍與主體包覆熔合，包覆抗張力體的纖維強化熱硬化性 樹脂硬化物製抗張力體外圍與包覆層內圍錨接的構造，因 此抗張力體可抑制主體包覆的熱收縮，有效保護光纖芯線 ，並滿足熱循環測試及抽拉測試。 又由於本發明之下路光纖電纜是錨接構造，因此在連 接作業當中，芯部之抗張力體的露出可藉由在包覆層形成 切口而容易剝離。因此，比起利用刀刃的削出、或需要使 用溶劑的習知使用接著劑的下路光纖電纜，避免拉往成端 箱的作業可在良好環境下安全且容易地進行，根據本發明 ，可提供一種細徑、實用的非金屬下路光纖電纜。 具體例4 在添加了熱硬化性觸媒（阿克蘇（Akzo )化藥社製、 卡德克斯B-CH50 : 4部、B : 1部）於酸乙烯酯樹脂（曰 本合成（composite )社製：艾世達 8100 )的樹脂浸泡槽 中，經由導件導入一條破斷伸度 4.6%、拉伸彈性率 520cN/dtex的聚芳基胺（P-Aramid)纖維（帝人製： TECHNORA T240、單絲直徑 12μιη、1 670dtex )的多絲, 接下來導入使內徑階段性縮小的擠壓噴嘴而擠壓形成未硬 化狀樹脂，並獲得外徑爲〇 · 5 m m的細徑棒狀物’使其通 -23- 1297788 (20) 過熔融擠出機的十字頭鑄模（200 °C )，利用添加了黑色 主膠料的ΜΙ = 2·4、密度0.921g/cm3、30μηι之擠鑄薄膜的 1%絕對値爲1 70MPa的LLDPE樹脂（日本Unicar社製： TUF2060 )，以包覆厚度0.25mm包覆成環狀，並立刻導 入冷卻水槽，使表面的包覆部冷卻固化。 接下來，以15m/min的速度，將此包覆未硬化線狀物 導入於入口及出口設有加壓密封部的長度1 8m的加壓蒸 氣硬化槽，並以蒸氣壓32.5Pa ( 145 °C )進行硬化，然後 導入具有已階段性加熱至21(TC至25(TC之內徑l.〇mm及 0.8mm的整徑鑄模的整徑器而對包覆外圍面進行整徑，並 獲得包覆外徑爲0.8mm之圓形剖面的包覆抗張力體6b， 並且在繞線管捲繞成連續狀。接下來，在40 °C的恆溫室 中對於繞線管進行40小時的乾燥熱處理（二次熱處理） 〇 此包覆抗張力體6b之 FRP部的補強纖維含量爲 61.1 VOL%，最小彎曲直徑（使包覆抗張力體形成環狀， 將圓圈縮小而加以彎曲，在發生彎曲破壞之前的圓圈直徑 )爲 6mm 〇 具體例5 除了在補強纖維使用一條破斷伸度3.6%、拉伸彈性 率490cN/dtex的聚芳基胺纖維（東麗· DU PONT-TORAY 製：凱芙拉（KEVLAR ) 29、單絲直徑 12μπι、1 670dtex )的多絲以外，其餘皆利用與具體例4相同的方法獲得圓 -24- 1297788 (21) 形剖面的包覆ί几張力體6b。 此包覆抗張力體6b之FRP部的補強纖維含量爲 5 8.9 VOL% ’最小彎曲直徑（使包覆抗張力體形成環狀， 將圓圈縮小而加以彎曲，在發生彎曲破壞之前的圓圈直徑 )爲 5mm 〇 對於具體例4及5所獲得的包覆抗張力體6b，分別 進行 80 °C熱間的24小時耐熱彎曲直徑測試時，淸除 30mm，以樣本長度 1 000mm反覆三次-3(TC—80°C的熱循 環測試，並且觀察包覆抗張力體6b之包覆層5b與FRP 製抗張力體4b的接著狀況，但雙方幾乎都不會發生包覆 層的收縮，而顯示出良好的結果。 接下來，將一條0 1 · 2 m m的發藍（b 1 u i n g )單鋼線作 爲支持線7b、兩條具體例1所獲得的包覆抗張力體6b、 一條0 0.25mm單模式纖維作爲光纖芯線2b導入十字頭 鑄模，並使用難燃PE (日本Unicar製：NUC973 9 )作爲 主體包覆部8b的形成樹脂，利用第7圖所示之形狀的口 型進行擠出包覆，並且立刻在溫度調節成6 0 °C的溫水冷 卻槽進行1次冷卻，接下來在水冷槽進行2次冷卻’並獲 得第6圖所示之剖面構造的下路電纜1 b。 爲了確認所得到的下路電纜1 b的鋪設性’如第8圖 所示，在壁面角落部以r=15mm (直徑30mm)鋪設時， 並不會發生FRP折損等的問題，而顯示出良好的結果。 比較例5 -25- 1297788 (22) 除了在補強纖維使用一條破斷伸度3.3 %、拉伸彈性 率670cN/dtex的聚芳基胺纖維（東麗· DU PONT-TORAY 製：凱芙拉 （KEVLAR ) 129、單絲直徑 12μηι、 1 6 70dtex)的多絲以外，其餘皆利用與具體例4相同的方 法獲得包覆抗張力體。 此包覆抗張力體之 FRP部的補強纖維含量爲 5 8.9 VOL%，最小彎曲直徑（使包覆抗張力體形成環狀， 將圓圈縮小而加以彎曲，在發生彎曲破壞之前的圓圈直徑 )爲 8 m m 〇 比較例6 除了在補強纖維使用一條破斷伸度2.4%、拉伸彈性 率7 80cN/dtex的聚芳基胺纖維（東麗· DU PONT-TORAY 製··凱芙拉（KEVALR ) 49、單絲直徑 12μιη、1 670dtex ) 的多絲以外，其餘皆利用與具體例4相同的方法獲得包覆 抗張力體。 此包覆抗張力體之 FRP部的補強纖維含量爲 5 5.8 VOL%，最小彎曲直徑（使包覆抗張力體形成環狀， 將圓圈縮小而加以彎曲，在發生彎曲破壞之前的圓圈直徑 )爲 1 0 · 5 mm 〇 從以上的具體例及比較例可以明白，根據本發明之 FRP製抗張力體，並不會使所要求的抗張力、抗壓縮性降 低，而可獲得彎曲半徑小的FRP製抗張力體，而且藉由 使用此FRP製抗張力體，可獲得鋪設性佳的下路光纖電 -26- 1297788 (23) 纜，因此具有以下效果。 亦即’ FRP製抗張力體包含上述具體例1至3所示的 形態’比起金屬製抗張力體，有彎曲直徑較大而容易折損 的技術性課題，爲了縮小會導致折損的彎曲直徑，雖然只 要縮小FRP直徑即可，但在補強纖維相同的情況下，就 會有抗張力減少的問題。 在此情況下，僅針對抗張力的改善可藉由將補強纖維 替換成高強度•高彈性率形式而加以解決，但也要求可抑 制本身構成會隨著環境溫度而變化之主體的樹脂之收縮的 功能（抗收縮），因此減少與主體樹脂之接觸面積（使抗 收縮性不易發揮功能）的手段當中，細徑化並不理想，而 要求與過去大致相同直徑，且彎曲半徑小的FRP製抗張 力體的必要性，本發明之FRP製抗張力體便可充分滿足 這種要求。 (產業上的可利用性） 根據本發明之下路光纖電纜，由於可實現輕量及細徑 化，因此可有效運用爲附設在加入者住宅的光纖。 而且，根據本發明之FRP製抗張力體，並不會使所 要求的抗張力、抗壓縮性降低，而可獲得彎曲半徑小的 FRP製抗張力體，而且藉由使用此FRP製抗張力體’可 獲得鋪設性佳的下路光纖，因此可有效運用在鋪設於加入 者住宅時。 -27- 1297788 (24) 【圖式簡單說明】 第1圖是顯示本發明之下路光纖電纜之一實施例的剖 面圖。 第2圖是本發明之下路光纖電纜所使用的包覆抗張力 體之抽拉（密接）力的測定方法說明圖。 第3圖是本發明之下路光線電纜的抽拉試驗說明圖。 第4圖是本發明之FRP製抗張力體及使用同抗張力 體的下路光纖電纜之一例的剖面圖。 第5圖是鋪設第4圖所示之下路光纖電纜時的說明圖 〇 第6圖是本發明之FRP製抗張力體及使用同抗張力 體的下路光纖電纜之其他例的剖面圖。 第7圖是形成第4圖所示之下路光纖電纜之主體包覆 部時所使用的口型的說明圖。 第8圖是確認本發明之下路光纖電纜之彎曲鋪設性時 的說明圖。 【主要 元件符 Htfe m 說 明 ] 1 下 路 光 纖 電 纜 la 下 路 光 纖 電 纜 lb 下 路 光 纖 電 纜 2 光 纖 心 線 2a 光 纖 心 線 2b 光 纖 心 線 -28- 1297788 (25) 3 光 纖 心 線 4 抗 張 力 體 4a 抗 張 力 體 4b 抗 張 力 體 5 包 覆 層 5a 包 覆 層 5b 包 覆 層 6 包 覆 抗 張 力 體 6 a 包 覆 抗 張 力 鹘 6b 包 覆 抗 張 力 體 7 支 持 線 7a 支 持 線 7b 支 持 線 8 主 體 包 覆 部 8a 主 體 包 覆 部 8b 主 體 包 覆 部 9 缺 □ 9 a 缺 □ 9b 缺 □ 10 細 幅 部 10a 細 幅 部 10b 細 幅 部 11 測 定 治 具 12 牽 引 線 -29 1297788 (26) 13 牽引線 14 牽引線 15 彎曲管 16 重錘 -30The drawing characteristics of the obtained lower optical fiber cable 1 were measured by a pull tester of the measuring system shown in Fig. 3. In Fig. 3, reference numeral 1 is a lower-end optical fiber cable to be tested, and 1, 2, 3, and 14 are traction lines, and 15 is a bent pipe through which the optical fiber cable 1 is inserted, and is bent at a curvature of R3 00 mm. Symbol 16 is a weight applied to the fiber optic cable 1 via a pull line 1 2 to apply a predetermined load. Using this test machine, the thermal cycle of the load of 3 4.3 N, the pulling length of 1 m, the temperature condition from -30 °C to +80 °C was repeated, and the transmission loss under the light source of the wavelength of 15 5 Onm was measured. The measurement results are organized and shown in Table 2 below. The shrinkage of the respective coating layers was not observed in the lower optical fiber cable 1 which was tested by using the coated tensile strength body 6 of Specific Example 1. -19- 1297788 (16) Specific examples 2 and 3 In the specific example 1, the pressurized vapor was set to 15.7 Pa (specific example 2) and 32.4 Pa (with a curing bath of 1 25 ° C and 145 ° C). The temperature was hardened in the same manner as in Example 1. The coated tensile strength line was obtained. The obtained tensile strength of the coated tensile tension line was 1, 15 N/10 mm (specific example 3), and was eliminated in the 80 ° C hot E-curve diameter test. 30mm. Using the coated tensile strength wire of the specific examples 2 and 3, the lower fiber cable was fabricated, but the transmission loss in the obtained pass light test did not increase, and there was no increase in the thermal cycle I! Comparative Example 1 In the specific example 1, the pressure vapor enthalpy is set to 8.8 Pa, and the temperature in the hardening tank is assumed to be 11 , and the rest is the same as in the specific example 1, and the pulling force of the coated tensile-resistant body is 7 Ν / 10 mm. In the 24-hour heat-resistant bending test at 80 °C, the diameter of 30 mm was not removed. Comparative Example 2 In the specific example 1, the density of the uncured small rod was 〇.928 g/cm3, MFR1.3 g. /l Omin, pull: vapor pressure prosthesis of the sulphate example 3) 'Besides, the rest are equal to 1.3 (specific example 2) Scoop 2 4 hours heat-resistant bending The transmission loss of the fiber cable pull test was the same as in the specific example 1. The vapor pressure of the groove was also hardened at 5 °C to [tension body]. The LLDPE resin (NUCG-5350 made by Unicar, Japan) obtained in a 30 mm diameter "sample will be damaged, and the coated resin of the material is made to have a tensile strength of 18 MPa, -20 - 1297788 (17) 1% absolute 値 340 MPa. 21.21mm is wrapped into a ring shape' and immediately introduced into the cooling water tank to cool and solidify the coated portion of the surface. Next, the coated uncured wire is introduced into the inlet and the outlet to be pressurized with a pressurized sealing portion. The steam hardening tank was hardened by a vapor pressure of 23.5 Pa, and then introduced into a shaper having a shaping mold having an inner diameter of 265.93 mm and 0.70 mm heated to 265 ° C to shape the outer peripheral surface of the coating and obtain a coating. The coated tensile body 6' having an outer diameter of 0.7 mm is wound into a continuous shape in the bobbin. The obtained coated tensile strength body may have a hardened portion which is partially covered by the pin hole, and thus cannot satisfy the tensile strength body. Physical properties. Comparative Examples 3 and 4 Three glass wires of 67.5 Tex (Comparative Example 3) and three wires each of which were 22.5 Tex silk yarns were used instead of the glass filament of 22.5 Tex of Specific Example 1 (Comparative Example 4). Other than the rest The coated tensile strength body was obtained in the same manner as in the specific example 1. The obtained coated tensile strength body was not uniformly dispersed in the cross section of the FRP portion, but was formed into a rice ball shape, and the roundness was poor. Directionality, and cannot be used as a tensile strength body. In particular, in Comparative Example 4 in which three filaments are used, in the soaking step of the unsaturated polyester resin, the silk of the crucible is untwisted and occurs in the silk. The length is not uniform, and a hair ball or the like is generated. Therefore, a pin hole is formed in the coating step of the thermoplastic resin, and a hardened portion is locally generated after hardening. -21 - 1297788 (18) Moreover, the obtained coating The outer periphery of the FRP of the tension-resistant body is not uniform, and the thickness of the coated coating after the shaping is not uniform at 0.70, and the FRP portion is partially exposed, which is not suitable as a tensile body. This should be because the predetermined size is Within 0.4mm of the outer diameter, the dispersion of the glass fiber is likely to become insufficient and uneven. Table 1 Coating adhesion heat resistance Bending diameter Thermal cycle -30 ° C - 80 ° C (N / cm) 80 ° C 24 hours 30 mm 0 three Cycle test 5 shrinkage rate (%) Specific example 1 12 5/5 OK 0 Specific example 2 11.3 5/5 OK 0 Specific example 3 15 5/5 OK 0 Comparative example 1 7 0/5 NG 0 - Table 2 Pumping Pull characteristic thermal cycle - 30 ° C - 80 ° c Five cycles Specific example 1 Good good example 2 Good specific example 3 '--- Good comparative example 1 Bad Χ κ Bad '- Note · · Transmission loss 0.3dB/km It is understood that the 卞-22-1297788 (19) can be understood from the above specific examples and comparative examples, and the optical fiber cable of the present invention is a thermoplastic resin which is made of a thermoplastic resin and is resistant to a fiber-reinforced thermosetting resin. The coated tensile strength body of the thermoplastic resin coating layer and the optical fiber core are coated together with the main body, and the fiber-reinforced thermosetting resin cured product is coated with a tensile strength-resistant body and coated with a tensile body. The structure of the periphery and the inner layer of the coating layer is anchored, so that the tensile body can suppress the heat shrinkage of the main body coating, effectively protect the optical fiber core wire, and satisfy the thermal cycle test and the pull test. Further, since the optical fiber cable of the present invention is of the anchoring structure, the exposure of the tensile body of the core can be easily peeled off by forming a slit in the coating layer during the joining operation. Therefore, it is possible to safely and easily perform the work of pulling the end tank in a good environment, compared to the conventional fiber-optic cable using the adhesive which is cut by the blade or which requires the use of a solvent, according to the present invention. A thin-diameter, practical non-metal drop fiber optic cable is provided. Specific Example 4 A thermosetting catalyst (manufactured by Akzo Chemical Co., Ltd., Cardex B-CH50: 4 parts, B: 1 part) was added to a vinyl acetate resin (composite) In the resin soaking tank of Ai Shida 8100), a polyarylamine (P-Aramid) fiber with a breaking elongation of 4.6% and a tensile modulus of 520 cN/dtex is introduced via a guide (Dynato: TECHNORA T240, A multifilament having a monofilament diameter of 12 μm and 1 670 dtex was introduced into an extrusion nozzle having a reduced inner diameter to be extruded to form an uncured resin, and a small diameter rod having an outer diameter of 〇·5 mm was obtained. Pass -23- 1297788 (20) through the crosshead mold (200 °C) of the melt extruder, using the ΜΙ = 2·4, density of 0.921g/cm3, 30μηι extruded film with black main compound added The 1% absolute 11 70 MPa LLDPE resin (manufactured by Nippon Unicar Co., Ltd.: TUF2060) was coated into a ring shape with a coating thickness of 0.25 mm, and immediately introduced into a cooling water tank to cool and solidify the coated portion of the surface. Next, the coated uncured wire was introduced at a speed of 15 m/min into a pressurized steam hardening tank having a length of 18 m with a pressure seal portion at the inlet and the outlet, and a vapor pressure of 32.5 Pa (145 °). C) hardening, and then introducing a sizing device having a full-length mold that has been heated to 21 (TC to 25 (the inner diameter of TC, 〇mm and 0.8 mm, and the full diameter of the outer peripheral surface of the coating) is obtained. The coated tension-resistant body 6b having a circular cross-section with an outer diameter of 0.8 mm was wrapped and wound into a continuous shape in a bobbin. Next, a 40-hour drying heat treatment was performed on the bobbin in a constant temperature chamber at 40 °C. (Secondary heat treatment) The reinforcing fiber content of the FRP portion of the coated tensile body 6b is 61.1 VOL%, and the minimum bending diameter (the annular shape of the coated tensile body is formed, the circle is reduced and bent, and before the bending failure occurs) Circle diameter) is 6 mm 〇 Specific Example 5 In addition to the reinforcing fiber, a polyarylamine fiber having a breaking elongation of 3.6% and a tensile modulus of elasticity of 490 cN/dtex (made by Toray DU PONT-TORAY: Kevlar (KEVLAR) was used. 29, other than the multifilament of monofilament diameter 12μπι, 1 670dtex) In the same manner as in the specific example 4, the coating of the round--24-1297788 (21)-shaped profile was obtained. The reinforcing fiber content of the FRP portion of the coated tensile body 6b was 5 8.9 VOL% 'minimum The bending diameter (the ring-shaped anti-tension body is formed into a ring shape, and the circle is reduced and bent, and the diameter of the circle before the occurrence of the bending failure) is 5 mm. For the coated tension-resistant body 6b obtained in the specific examples 4 and 5, respectively, 80 ° is performed. When testing the 24-hour heat-resistant bending diameter of the C-heat room, remove 30mm, repeat the test with a sample length of 1 000mm three times -3 (TC-80 °C thermal cycle test, and observe the cladding layer 5b and FRP of the coated tensile strength body 6b. The subsequent state of the tensile body 4b was produced, but the shrinkage of the coating layer was hardly occurred on both sides, and good results were obtained. Next, a 0 1 · 2 mm blue (b 1 uing ) single steel wire was used as The support wire 7b, the coated tension-resistant body 6b obtained in the two specific examples 1, and a single-mode fiber of 0 0.25 mm are introduced into the crosshead mold as the optical fiber core 2b, and a flame-retardant PE (manufactured by Unicar, Japan: NUC973 9) is used as a main package. Forming tree of the cover 8b The grease is extrusion-coated with the shape of the shape shown in Fig. 7, and immediately cooled once in a warm water cooling tank adjusted to a temperature of 60 °C, followed by cooling twice in the water-cooling tank. The lower cable 1 b of the cross-sectional structure shown in Fig. 6 is obtained. In order to confirm the laying property of the obtained lower cable 1 b as shown in Fig. 8, it is laid at a corner portion of the wall at r = 15 mm (diameter: 30 mm). At the time, problems such as FRP breakage do not occur, and good results are exhibited. Comparative Example 5 -25- 1297788 (22) In addition to a reinforcing fiber, a polyarylamine fiber having a breaking elongation of 3.3% and a tensile modulus of 670 cN/dtex (Toray DU PONT-TORAY: Kevlar ( A coated tensile strength body was obtained by the same method as in the specific example 4 except that the multifilament of 129, the filament diameter of 12 μm, and 1 6 70 dtex) was used. The FRP portion of the coated tensile body has a reinforcing fiber content of 5 8.9 VOL%, and the minimum bending diameter (the ring shape of the coated tensile body is reduced, and the circle is reduced and bent, and the diameter of the circle before the occurrence of bending failure) is 8 mm. 〇Comparative Example 6 In addition to the reinforcing fiber, a polyarylamine fiber having a breaking elongation of 2.4% and a tensile modulus of elasticity of 780 cN/dtex (Toray DU PONT-TORAY Kevlar 49) was used. A coated tensile strength body was obtained by the same method as in Concrete Example 4 except for the multifilament having a monofilament diameter of 12 μm and 1 670 dtex. The FRP portion of the coated tensile body has a reinforcing fiber content of 55.8 VOL%, and the minimum bending diameter (the ring shape of the coated tensile body is reduced, and the circle is reduced and bent, and the diameter of the circle before the occurrence of bending failure) is 10 5 mm 〇 From the above specific examples and comparative examples, it is understood that the FRP tensile strength body according to the present invention does not reduce the required tensile strength and compression resistance, and can obtain a FRP tensile body having a small bending radius. Further, by using the FRP tensile strength-resistant body, a low-laying optical fiber -26-1297788 (23) cable having good layability can be obtained, and thus has the following effects. In other words, the 'FRP tensile strength-resistant body includes the above-described specific examples 1 to 3'. The metal tensile strength-resistant body has a large bending diameter and is easily broken. In order to reduce the bending diameter which may cause breakage, It is only necessary to reduce the diameter of the FRP, but in the case where the reinforcing fibers are the same, there is a problem that the tensile strength is reduced. In this case, the improvement against the tensile resistance alone can be solved by replacing the reinforcing fiber with a high-strength, high-elasticity form, but it is also required to suppress the shrinkage of the resin which itself constitutes a body which varies with the ambient temperature. Since it has a function (resistance to shrinkage), the means for reducing the contact area with the main resin (the function of preventing the shrinkage resistance from functioning easily) is not preferable, and the FRP strain resistance which is substantially the same diameter as in the past and has a small bending radius is required. The necessity of the body, the FRP tensile body of the present invention can fully satisfy this requirement. (Industrial Applicability) According to the present invention, the optical fiber cable of the present invention can be effectively used as an optical fiber attached to a home of a subscriber because it can be made lightweight and thin. Further, the FRP-made tensile body according to the present invention does not reduce the required tensile strength and compression resistance, and can obtain a FRP tensile body having a small bending radius, and can be laid by using the FRP tensile body. Good off-line fiber, so it can be effectively used when laying in the home of the subscriber. -27- 1297788 (24) [Simple description of the drawings] Fig. 1 is a cross-sectional view showing an embodiment of the optical fiber cable of the present invention. Fig. 2 is an explanatory view showing a method of measuring the drawing force of the coated tension-resistant body used in the optical fiber cable of the present invention. Fig. 3 is an explanatory view of the drawing test of the road light cable of the present invention. Fig. 4 is a cross-sectional view showing an example of the FRP tensile strength body of the present invention and a lower optical fiber cable using the same tensile strength. Fig. 5 is an explanatory view showing the laying of the optical fiber cable of the lower section shown in Fig. 4. Fig. 6 is a cross-sectional view showing another example of the FRP tensile strength body of the present invention and the lower optical fiber cable using the same tensile strength. Fig. 7 is an explanatory view showing a lip shape used when forming a main body covering portion of the lower fiber optical cable shown in Fig. 4. Fig. 8 is an explanatory view for confirming the bending property of the optical fiber cable of the present invention. [Main component Htfe m description] 1 Down fiber cable la Down fiber cable lb Down fiber cable 2 Fiber core wire 2a Fiber core wire 2b Fiber core wire -28- 1297788 (25) 3 Fiber core wire 4 Tension body 4a Tensile body 4b Tensile body 5 Cladding layer 5a Cladding layer 5b Cladding layer 6 Coated tensile body 6 a Coated tensile strength 鹘6b Coated tensile body 7 Support line 7a Support line 7b Support line 8 Body cladding part 8a Body package Cover portion 8b Main body covering portion 9 missing □ 9 a Short □ 9b Short □ 10 Thin portion 10a Thin portion 10b Thin portion 11 Measuring jig 12 Pull wire -29 1297788 (26) 13 Pull wire 14 Pull wire 15 Bending Tube 16 weight -30