(2) (2)1352225 無法充分發揮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，但是會因爲工 數 '材料費的增加而導致成本增加，並非很好的對策，一 旦與FRP的接著過於穩固，則進行連接工程時，將很難 使爲了避免拉往成端箱的包覆部剝離。 另一方面，使FRP交界與熱可塑性樹脂包覆錨接的 熱可塑性樹脂包覆纖維強化合成樹脂製棒狀物的製造方法 揭示於專利文獻2。 此文獻所揭示的製造方法是利用熔融的熱可塑性樹脂 ，將使補強纖維束浸泡在未硬化之熱硬化性樹脂而成的未 硬化狀補強芯部加以包覆，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，將藉由這種製造方法所得到的棒狀物使用在下 路光纖電纜的抗張力體的情況下，有以下所要說明的技術 性課題。 專利文獻1 :日本特開2 0 0 1 - 3 3 7 2 5 5號公報 專利文獻2:日本特公昭63-2772號公報 【發明內容】 -6- (3) (3)1352225 【發明所欲解決之課題】 亦即，根據上述專利文獻2所揭示的製造方法，例如 在以玻璃纖維作爲補強纖維，於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(10MPa)左右的接著強度，但包覆表面並不一定 平滑，因而有不易獲得均一且細徑之成品的問題。 因此，本案申請人之前曾針對一種其特徵爲具有均一 性之FRP抗張力體的下路光纖電纜，提出了日本特願 2002-3265 1 3號的申請案。 然而，就本專利申請案所揭示的FRP抗張力體而言 ，實際要製造下路光纖電纜時，在以製造條件，尤其是以 較低速利用熱可塑性樹脂對於FRP抗張力體進行主體包 覆的情況、以及在擠壓溫度稍高的區域施以主體包覆的情 況下，會因爲包覆部發泡的現象而發生外觀不佳及對於光 纖造成不良影響的問題。 因此，本案發明者群針對要製造下路光纖電纜時，在 以製造條件，尤其是以較低速，以及在擠壓溫度高的區域 利用熱可塑性樹脂對於附有包覆之FRP製抗張力體進行 主體包覆時，主體包覆部或附有包覆之FRP製抗張力體 的包覆部會發泡的現象致力檢討的結果發現，尤其FRP 部的殘留苯乙烯單體就是此發泡現象的原因，藉由將此限 制在預定範圍便可消除此現象，因而完成了本發明^ 亦即，本發明之目的是針對下路光纖電纜用FRP製 抗張力體大幅降低發泡現象。 -7- (4) (4)1352225 【用以解決課題的手段】 爲了達成上述目的，本發明是針對具有利用熱硬化性 樹脂使補強纖維結著的FRP部的下路光纖電纜用FRP製 抗張力體，使前述FRP部的殘留苯乙烯單體量形成0.018 重量％以下。 而且，本發明是針對具有利用熱硬化性樹脂使補強纖 維結著的FRP部；以及在前述FRP部的外圍，與前述 FRP部的外表面以錨接構造包覆而形成的熱可塑性樹脂包 覆層的下路光纖電纜用FRP製抗張力體，使前述FRP部 的殘留苯乙烯單體量形成0.03重量％以下。 前述熱硬化性樹脂可由乙烯酯樹脂構成。 前述熱可塑性樹脂包覆層是表面經過整徑加工者，該 包覆層的表面可使利用雷射外徑測定器所獲得的表面凹凸 度形成2至3/100mm以下。 前述熱可塑性樹脂包覆層可由LLDPE構成。 前述FRP部可在補強纖維使用玻璃絲。 前述下路光纖電纜用FRP製抗張力體可使用熱風式 吉爾老化恆溫箱，使以8 0 °C乾燥4 0個小時後的重量減少 率成爲0.1 %以下》 【發明效果】 本發明的下路光纖電纘用FRP製抗張力體由於是將 殘留苯乙烯單體量及/或重量減少率設定在預定範圍，因 此可抑制使用這些抗張力體製造下路光纖電纜時所發生的 -8- (5) (5)1352225 發泡現象。 而且，尤其在利用附有包覆之FRP製抗張力體時， 由於FRP部外圍與包覆層內圍具有錨接構造，因此只要 使主體包覆層熔接或密接於此包覆層，即可抑制下路光纖 電纜全體的熱收縮，而有效保護光纖芯線。 再者，由於是錨接構造，在FRP外圍並不需要另外 塗布接著劑，因此不需要接著劑、塗布步驟、設備，而可 謀求步驟的簡化及成本降低，因而極爲經濟。 另一方面，由於是錨接構造，因此在連接作業當中， 芯部從FRP製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，比起利用刃物的削出、或必須使用溶 劑之習知使用接著劑的下路光纖電纜，可安全地在良好環 境下容易進行避免拉往成端箱的作業。 因此，根據本發明，可提供一種細徑且實用的非金屬 型下路光纖電纜用抗張力體。 【實施方式】 以下，針對本發明的實施形態，參照所附圖面加以詳 細說明。第1圖是可使用本發明之FRP製抗張力體或附 有包覆之抗張力體的下路光纖電纜之一例。該圖所示的下 路光纖電纜1具有光纖芯線2、3、抗張力體4、支持線5 、及主體包覆6。 光纖芯線2、3是在電纜1的中心軸上配置成上下相 鄰的狀態。抗張力體4是在光纖芯線2、3上下保持預定 -9- (6) (6)1352225 間隔配置有一對。 支持線5是位於上側抗張力體4的上方，並且具有比 抗張力體4大的直徑。主體包覆6是將光纖芯線2、3、 抗張力體4及支持線5的外圍一槪包覆而形成。 抗張力體4是由具有利用熱硬化性樹脂使補強纖維結 著的FRP部的FRP製抗張力體，或是具有利用熱硬化性 樹脂使補強纖維結著的FRP部；以及在此FRP部的外圍 ，與FRP部的外表面以錨接構造包覆而形成的熱可塑性 樹脂包覆層的附有包覆之FRP製抗張力體所構成。 這種FRP製抗張力體必須使FRP部分的殘留苯乙烯 單體在 0.018重量％(FRP部對比）以下。而附有包覆之 FRP製抗張力體必須使殘留苯乙烯單體在0.03重量％(相 對於整個附有包覆之FRP製抗張力體）以下。 如果殘留苯乙稀單體超過這些量，則在進形下路光纖 電纜製造步驟中的主體包覆時，會與熔融狀的主體包覆熱 可塑性樹脂接觸，使殘留苯乙烯單體揮發等而發生包覆部 或主體包覆部發泡等的異常。 本發明當中，殘留苯乙烯單體的測定是以如下方法來 進行。將測定用試料細細地切成2至3mm的長度，並且 正確秤量大約3g，再加上10m丨的乙酸乙酯（抽出液），然 後在室溫下放置一天一夜。 利用氣相色譜儀以管柱溫度1 5 0 °C使抽出液1 μΐ氣 化’並測定氣化物的成分及產生量。另外，藉由事前作成 苯乙烯單體之各濃度的標準液，並且進行與從氣相色譜儀 -10- (8) (8)1352225 從E，S，T等的玻璃纖維選擇，但從經濟性的觀點來看，建 議採用E玻璃。 玻璃絲以構成的單纖維直徑爲3至1 3 μιη，且未併捻 複數條絲的單絲狀爲佳，可使用1 1 .2至67.5Tex。 在此情況下，使用支數大，也就是超過67.5Tex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 1 1 .2Tex以下的絲，但由於步驟較爲繁雜，而且會伴隨成 本提升，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、糾結的情況較少，而可獲得外圍均一的 未延伸棒狀物。 第1圖所示的構成當中，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，大致以55至7 OVOL%左右爲佳。 另外，可使用於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（ 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之觀點來看，以 乙烯酯樹脂（環氧丙烯酸酯樹脂等）尤佳。 未硬化狀補強芯部之包覆層]2所使用的熱可塑性樹 脂可從與主體包覆部6的熱可塑性樹脂具有相熔性的樹脂 -12 - (10) (10)1352225 體1 0以FRP部11自包覆層12所使用的熱可塑性樹脂的 抽拉力爲13 N/10 mm以上較爲合適。此抽拉力是作爲錨接 構造之密接力的指標，並藉由以下的測定方法來測定。 準備一個安裝有直徑比FRP芯部之外徑稍大之穿透 孔的測定治具的試驗機，另一方面使附有包覆之FRP製 抗張力體11之端部的包覆層12剝離，接下來於包覆層 12藉由剃刀施以10mm長的刻線，而準備好殘留有1 〇mm 長度之包覆層12的樣本S。 將樣本S插通於試驗機的穿透孔，並且以50mm/分鐘 的速度施以拉力荷重，然後從該圖表求出抽拉力。 在附有包覆之FRP抗張力體當中，熱可塑性樹脂包 覆層表面雖經過整徑加工，但其外徑精度最好使利用雷射 外徑測定器所獲得的表面凹凸度形成2至3 / 1 0 0 m m以下 ，如果超過此値，將容易發生主體包覆時的發泡狀況。 另外，本發明之附有包覆之FRP製抗張力體1〇最好 是使用熱風式吉爾老化恆溫箱，使以801乾燥40個小時 後的重量減少率成爲0 · 1重量％以下。 這在以高溫高壓蒸氣使FRP部硬化時，由於未硬化 狀的熱硬化性樹脂成分的揮發、或硬化發熱狀態及軟化狀 態的包覆層、以及從外部作用的徵氣壓等的關係，硬化已 大致完成，但僅藉由此步驟製造的下路光纖電纜用附有包 覆之FRP製抗張力體並不夠充分，會發生前述發泡等的 狀況。 錯由減少則述殘留本乙稀單體量的限制、或包覆部表 -14- (11) (11)1352225 面、以及與FRP之交界的水分等之滯留，或是給予二次 加熱處理，可使以8(TC乾燥40個小時後的重量減少率成 爲〇·】％以下。二次熱處理可爲連續於熱硬化性樹脂的硬 化步驟而通到加熱處理槽的方法，但亦可在捲繞之後進行 〇 在捲繞之後進行二次熱處理的情況下，如果在捲繞繞 線管使用 ABS樹脂等，則繞線管本身有時會熱變形，因 此最好以40 °C左右進行長時間的處理。 以下，針對本發明之更具體的實施例加以說明，但本 發明並不限定於下述實施例。 實施例1 在添加了 4份熱硬化性觸媒（化藥亞克柔（Akzo)社製 、卡多克斯 BCH50( cadox;商品名））、1份卡亞卜其 魯B (商品名）於乙烯酯樹脂（三井化學社製：H81 00)的 樹脂浸泡槽中，經由導件導入14條單絲徑ΙΟμιη、 22.5Tex的Ε玻璃絲（日東紡織社製：ECEN225 ]/0 1 .0ZR) ’接下來導入使內徑階段性縮小的擠壓噴嘴使未硬化狀樹 脂擠壓成形，並獲得外徑爲〇.5 05 mm的細徑棒狀物，使 此通過熔融擠出機的交叉頭模具（200。(：），利用添加了黑 色主膠料的MI = 2.4、密度〇.921g/cm3、30μηι之擠鑄薄膜 的1%絕對値爲170MPa的 LLDPE樹脂（日本優尼卡 (Unicar)社製：TUF2060)，以包覆厚度〇.25mm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。 -15- (12) (12)1352225 接下來，將此包覆未硬化線狀物以15m/m in的速度導 入於入口及出口設有加壓密封部之長度18m的加壓蒸氣 硬化槽，以蒸氣壓32.5Pa(145°C)使其硬化，然後導入具 有已階段性加熱至 210°C至 2 5 0 t之內徑 0.93mm及 0.80mm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_8mm的包覆抗張力體10，並且在繞 線管捲繞成連續狀。接下來，對於繞線管在40 °C的恆溫 室中進行40個小時的乾燥熱處理（二次熱處理）。 此包覆抗張力體1〇的玻璃纖維含量爲61.9VOL %， 前述抽拉力爲15N/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38mm，以樣本長度 1 000mm反覆三次-30°C至 80°C的熱循環測試，並且觀察 包覆抗張力體10的包覆層12與FRP製抗張力體11的接 著狀況，但幾乎從未發生包覆層12的收縮。 另外，利用前述測定方法所獲得的殘留苯乙烯單體量 爲〇 · 〇 1 5重量％。再者，利用前述測定方法所獲得的附有 包覆之FRP製抗張力體的重量減少率爲〇.〇8%，而得以平 衡。 針對不進行包覆抗張力體10之製造時的二次熱處理 的情況（比較例1 )、改變硬化溫度的情況（比較例2)、改變 熱硬化性樹脂的情況（比較例3 )下的殘留苯乙烯單體量及 8 0 °C X 4 0個小時的重量減少率、以及利用以下所示之主體 包覆試驗的發泡現象發生之有無加以歸納而顯示於表1。 主體包覆試驗是在將包覆抗張力體10插通於熔融擠 -16- (15) (15)1352225 3 光纖芯線 4 抗張力體 5 支持線 6 主體包覆層（主體包覆；主體包覆部） 10 附有包覆之FRP製抗張力體（包覆抗張力體） 11 FRP製抗張力體 1 2 包覆層(2) (2) 1352225 The function of the drop fiber cable cannot be fully utilized. In this case, by applying an adhesive on the periphery of the hardened FRP line or coating the adhesive resin, the adhesion force can be enhanced, but the cost is increased due to the increase in the number of materials, which is not very good. The countermeasures, once the connection with the FRP is too stable, it is difficult to peel off the covering portion for avoiding pulling to the end box when the joining process is performed. On the other hand, a method for producing a rod made of a thermoplastic resin-coated fiber-reinforced synthetic resin in which an FRP junction is coated with a thermoplastic resin is disclosed in Patent Document 2. The manufacturing method disclosed in this document is to coat a uncured reinforcing core portion obtained by immersing a reinforcing fiber bundle in an uncured thermosetting resin by using a molten thermoplastic resin, and then immediately making the thermoplastic resin After the coating layer is cooled and solidified, it is introduced into a hardening tank for pressurizing 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 and hardened. The coated thermoplastic resin is cooled to bond the core portion of the fiber-reinforced thermosetting resin (FRP) to the coated thermoplastic resin. However, when the rod obtained by such a manufacturing method is used as a tensile body of a lower optical fiber cable, there is a technical problem to be described below. [Patent Document 1] Japanese Patent Laid-Open Publication No. Hei 2 0 0 1 - 3 3 7 2 5 5 Patent Document 2: Japanese Patent Publication No. Sho 63-2772 [Abstract] -6- (3) (3) 1352225 [Invention In the manufacturing method disclosed in the above-mentioned Patent Document 2, for example, when glass fiber is used as the reinforcing fiber, and the thermosetting resin is made of unsaturated polyester and coated with polyethylene, the rod shape is used. Although the bonding strength of about 106 kg/cm 2 (10 MPa) can be obtained, the coated surface is not necessarily smooth, and thus it is difficult to obtain a uniform and fine-diameter finished product. Therefore, the applicant of the present application has previously filed an application of Japanese Patent Application No. 2002-3265 No. 3 for a lower-end optical fiber cable characterized by a FRP tensile body having uniformity. However, in the case of the FRP tensile strength body disclosed in the present patent application, when the optical fiber cable is actually manufactured, the main body of the FRP tensile body is coated with the thermoplastic resin under the manufacturing conditions, especially at a lower speed. In the case where the main body is coated in a region where the extrusion temperature is slightly higher, there is a problem that the appearance of the coating portion is not good and the optical fiber is adversely affected. Therefore, the inventors of the present invention have used a thermoplastic resin for the coated FRP tensile body in a manufacturing condition, particularly at a relatively low speed, and in a region where the extrusion temperature is high, in order to manufacture the lower optical fiber cable. When the main body is covered, the main body coating portion or the coating portion of the FRP-made tensile body with the coating is foamed. As a result of the review, it is found that the residual styrene monomer in the FRP portion is the cause of the foaming phenomenon. This phenomenon can be eliminated by limiting this to a predetermined range, and thus the present invention has been completed. That is, the object of the present invention is to substantially reduce the foaming phenomenon for the FRP tensile strength body for the lower optical fiber cable. -7- (4) (4) 1352225 [Means for Solving the Problem] In order to achieve the above object, the present invention is directed to an FRP-resistant strainer for a drop fiber optical cable having an FRP portion in which a reinforcing fiber is bonded by a thermosetting resin. The amount of residual styrene monomer in the FRP portion is made 0.019% by weight or less. Further, the present invention is directed to an FRP portion having a reinforcing fiber adhered by a thermosetting resin, and a thermoplastic resin coating formed by coating an outer surface of the FRP portion with an anchor structure on the outer periphery of the FRP portion. The lower fiber optical cable of the layer was made of a tensile strength member made of FRP, and the amount of residual styrene monomer in the FRP portion was 0.03% by weight or less. The thermosetting resin may be composed of a vinyl ester resin. The thermoplastic resin coating layer is a surface having a full diameter, and the surface of the coating layer can be formed to have a surface unevenness of 2 to 3/100 mm or less by a laser outer diameter measuring device. The aforementioned thermoplastic resin coating layer may be composed of LLDPE. The FRP portion can use a glass filament in the reinforcing fiber. The FRP tensile strength body for the lower optical fiber cable can be a hot air type Jill aging incubator, and the weight reduction rate after drying at 80 ° C for 40 hours is 0.1% or less. [Effect of the Invention] The lower fiber of the present invention Since the tensile strength of the residual styrene monomer and/or the weight reduction rate is set to a predetermined range by the FRP tensile body for electric sputum, it is possible to suppress the occurrence of -8-(5) when using the tensile-resistant body to manufacture the optical fiber cable. 5) 1352225 Foaming phenomenon. Further, in particular, when the tensile member made of FRP coated with the coating is used, since the periphery of the FRP portion and the inner periphery of the coating layer have an anchoring structure, the main cladding layer can be suppressed by welding or adhering to the coating layer. The entire fiber optic cable is heat-shrinked, and the fiber core is effectively protected. Further, since it is an anchor structure, it is not necessary to apply an additional adhesive to the periphery of the FRP, so that an adhesive, a coating step, and equipment are not required, and simplification of steps and cost reduction can be achieved, which is extremely economical. On the other hand, since it is an anchoring structure, the exposure of the core from the FRP tensile body can be easily peeled off by forming a slit in the coating layer during the joining operation. Therefore, it is safer to carry out the work of avoiding the drawing to the end tank in a good environment, compared to the conventional optical fiber cable using the adhesive which is used for cutting out the blade or using a solvent. Therefore, according to the present invention, it is possible to provide a tension-resistant body for a narrow-diameter and practical non-metallic type optical fiber cable. [Embodiment] Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. Fig. 1 is an example of a drop fiber optical cable which can be used with the FRP tensile body of the present invention or a coated tensile body. The lower optical fiber cable 1 shown in the figure has an optical fiber core 2, 3, a tensile strength body 4, a support wire 5, and a main body cladding 6. The optical fiber core wires 2, 3 are arranged in a state of being vertically adjacent to each other on the central axis of the cable 1. The tension-resistant body 4 is held on the upper and lower sides of the optical fiber cores 2, 3 by a predetermined number of -9-(6) (6) 1352225. The support wire 5 is located above the upper tensile body 4 and has a larger diameter than the tensile body 4. The main body cover 6 is formed by coating the outer edges of the optical fiber core wires 2, 3, the tensile strength body 4, and the support wire 5. The tensile strength member 4 is an FRP tensile body having an FRP portion in which a reinforcing fiber is bonded by a thermosetting resin, or an FRP portion having a reinforcing fiber bonded by a thermosetting resin; and a periphery of the FRP portion. The thermoplastic resin coating layer formed by coating the outer surface of the FRP portion with an anchor structure is coated with a coated FRP tensile body. The FRP tensile strength body must have a residual styrene monomer in the FRP portion of 0.018 wt% or less (FRP portion comparison). The coated FRP tensile strength body must have a residual styrene monomer of 0.03 wt% or less (relative to the entire coated FRP tensile strength body). If the residual styrene monomer exceeds these amounts, the main body of the advanced optical fiber cable manufacturing step is coated, and the molten main body is coated with the thermoplastic resin to volatilize the residual styrene monomer. An abnormality such as foaming of the covering portion or the main body covering portion occurs. In the present invention, the measurement of the residual styrene monomer is carried out in the following manner. The measurement sample was finely cut into a length of 2 to 3 mm, and about 3 g was weighed correctly, and 10 m of ethyl acetate (extracted solution) was added, followed by standing at room temperature for one day and one night. The extract was gasified by a gas chromatograph at a column temperature of 150 ° C, and the composition and amount of the vapor were measured. In addition, by preparing a standard solution of each concentration of styrene monomer in advance, and performing with glass fiber from the gas chromatograph-10-(8) (8) 1352225 from E, S, T, etc., but from the economy From a sexual point of view, it is recommended to use E glass. The glass filament is preferably composed of a single fiber having a diameter of 3 to 13 μm, and a monofilament of a plurality of filaments is not combined, and may be used in a range of from 11.2 to 67.5 Tex. In this case, when a glass having a large number of counts, that is, more than 67.5Tex, is used, it has a bad influence on the roundness at the time of FRP, and then a thin-walled overmolding step using a thermoplastic resin is followed. It is not easy to carry out uniform coating. On the other hand, although there are also yarns of less than 1 2 Tex on the market, it is not economical because the steps are complicated and costly. The glass filament is selected because the filament is subjected to a twist of, for example, 1/inch, etc. Therefore, 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. In the configuration shown in Fig. 1, the volume content of the glass fiber of the tension-resistant body 4 can be determined according to the required physical properties, but in the invention of the present invention for the purpose of making the diameter smaller, it is preferably about 55 to 7 OVOL%. . In addition, 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 (such as an epoxy acrylate resin), or an epoxy resin, and the like. In the case of adding a catalyst for curing, etc., it is preferable to use a vinyl ester resin (such as an epoxy acrylate resin) from the viewpoint of physical properties such as heat resistance. The thermoplastic resin used for the coating layer of the uncured reinforcing core portion 2 can be made of a resin -12 - (10) (10) 1352225 body 10 having a phase melting property with the thermoplastic resin of the main body covering portion 6. The drawing force of the thermoplastic resin used for the FRP portion 11 from the coating layer 12 is preferably 13 N/10 mm or more. This pulling force is an index of the adhesion of the anchoring structure and is measured by the following measuring method. A test machine for mounting a measuring jig having a through hole having a diameter slightly larger than the outer diameter of the FRP core portion is prepared, and on the other hand, the coating layer 12 having the end portion of the coated FRP tensile body 11 is peeled off. Next, a sample S having a coating layer 12 having a length of 1 mm was prepared by applying a 10 mm long scribe line to the cladding layer 12 by a razor. The sample S was inserted into the penetration hole of the testing machine, and a tensile load was applied at a speed of 50 mm/min, and then the drawing force was obtained from the chart. In the coated FRP tensile body, the surface of the thermoplastic resin coating is subjected to full diameter processing, but the outer diameter precision is preferably such that the surface roughness obtained by the laser outer diameter measuring device is 2 to 3 / If it is more than 1 0 0 mm, if it exceeds this, the foaming condition at the time of main body coating will easily occur. Further, it is preferable that the coated FRP tensile strength member 1 of the present invention is a hot air type Jill aging incubator, and the weight reduction rate after drying at 801 for 40 hours is 0.1% by weight or less. When the FRP portion is cured by high-temperature and high-pressure steam, the hardening has occurred due to the volatilization of the uncured thermosetting resin component, the curing of the heat-generating state and the softened state, and the relationship between the external pressure and the external pressure. It is almost completed, but the lower-end optical fiber cable manufactured by this step is not sufficiently sufficient for the FRP-made tensile body with a coating, and the foaming or the like may occur. If the error is reduced, the amount of residual ethylene monomer is limited, or the surface of the coated portion is in the form of the surface of the surface of the surface of the surface of the surface of the surface of the surface of the surface of the surface of the surface of the surface of the surface of the surface of the surface of the surface of the surface of the surface of 8 (the weight reduction rate after TC drying for 40 hours is 〇··% or less. The secondary heat treatment may be a method of passing through the heat treatment tank in the curing step of the thermosetting resin, but may also be In the case where the crucible is subjected to secondary heat treatment after winding, if the ABS resin or the like is used in the winding bobbin, the bobbin itself may be thermally deformed, so it is preferable to grow at about 40 ° C. The following is a description of a more specific embodiment of the present invention, but the present invention is not limited to the following examples. Example 1 4 parts of a thermosetting catalyst (chemical yake soft) was added. Akzo), Kadox BCH50 (cadox; trade name), and one Kayabuki B (trade name) in a resin soaking tank of vinyl ester resin (manufactured by Mitsui Chemicals Co., Ltd.: H81 00) The guide is introduced into 14 single-filament ΙΟμιη, 22.5Tex Ε glass filaments ( Manufactured by Dongfang Textile Co., Ltd.: ECEN225]/0 1 .0ZR) 'The next step is to introduce an extrusion nozzle that gradually reduces the inner diameter to extrude the uncured resin and obtain a small diameter rod with an outer diameter of 〇.5 05 mm. To make this pass through the cross-head mold of the melt extruder (200. (:), using 1% absolute 値 of the extruded film with MI = 2.4, density 〇.921g/cm3, 30μηι added with black main compound) The LLDPE resin (manufactured by Unica, Japan: TUF2060) of 170 MPa was coated in a ring shape with a coating thickness of 2525 mm and immediately introduced into a cooling water tank to cool and solidify the coated portion of the surface. (12) (12) 1352225 Next, the coated uncured wire was introduced into the inlet and outlet at a speed of 15 m/m in a pressurized steam hardening tank having a length of 18 m of a pressure seal portion, and was vapor-pressured. Hardening at 32.5 Pa (145 ° C), and then introducing a shaper having a shaping mold having an inner diameter of 0.93 mm and 0.80 mm which has been heated stepwise to 210 ° C to 250 ° to plasticize the outer peripheral surface of the coating. A coated tensile body 10 having an outer diameter of 〇 8 mm is obtained and wound into a continuous shape in the bobbin. For the bobbin, a drying heat treatment (secondary heat treatment) was carried out for 40 hours in a thermostatic chamber at 40 ° C. The glass fiber content of the coated tensile body 1 为 was 61.9 VOL %, and the aforementioned pulling force was 15 N/10 mm. In addition, in the 24-hour heat-resistant bending diameter test between the heats of 80 ° C, 38 mm was removed, and the thermal cycle test was repeated three times at -30 ° C to 80 ° C with a sample length of 1 000 mm, and the package of the coated tensile body 10 was observed. The coating 12 and the FRP tensile body 11 are in the same state, but the shrinkage of the coating 12 hardly occurs. Further, the amount of the residual styrene monomer obtained by the above measurement method was 〇 · 〇 15 wt%. Further, the weight reduction ratio of the coated FRP-made tensile body obtained by the above-mentioned measuring method was 〇8% ,, and was balanced. The residual benzene in the case where the secondary heat treatment in the production of the coated tensile body 10 is not performed (Comparative Example 1), the curing temperature is changed (Comparative Example 2), and the thermosetting resin is changed (Comparative Example 3) The amount of ethylene monomer and the weight reduction rate of 80 ° C X 40 hours and the presence or absence of the foaming phenomenon by the main body coating test shown below are summarized in Table 1. The main body coating test is to insert the coated tensile body 10 into the melt extruded-16- (15) (15) 1352225 3 optical fiber core 4 tensile body 5 support line 6 main body coating (main body cladding; main body cladding 10) FRP-made tensile body (coated with tensile strength) 11 FRP tensile body 1 2 coating
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