JPH01147511A - Production of grooves spacer - Google Patents
Production of grooves spacerInfo
- Publication number
- JPH01147511A JPH01147511A JP62305917A JP30591787A JPH01147511A JP H01147511 A JPH01147511 A JP H01147511A JP 62305917 A JP62305917 A JP 62305917A JP 30591787 A JP30591787 A JP 30591787A JP H01147511 A JPH01147511 A JP H01147511A
- Authority
- JP
- Japan
- Prior art keywords
- spacer
- inner layer
- extrusion
- spacer body
- main body
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 125000006850 spacer group Chemical group 0.000 title claims abstract description 75
- 238000004519 manufacturing process Methods 0.000 title claims description 15
- 238000001125 extrusion Methods 0.000 claims abstract description 26
- 229920005992 thermoplastic resin Polymers 0.000 claims abstract description 14
- 238000007765 extrusion coating Methods 0.000 claims abstract description 11
- 239000000155 melt Substances 0.000 claims abstract description 6
- 238000000034 method Methods 0.000 claims description 7
- 239000011248 coating agent Substances 0.000 claims description 6
- 238000000576 coating method Methods 0.000 claims description 6
- 239000013307 optical fiber Substances 0.000 claims description 3
- 230000002093 peripheral effect Effects 0.000 claims description 2
- 229910000831 Steel Inorganic materials 0.000 abstract description 14
- 239000010959 steel Substances 0.000 abstract description 14
- 229920001903 high density polyethylene Polymers 0.000 abstract description 10
- 239000004700 high-density polyethylene Substances 0.000 abstract description 10
- 210000002445 nipple Anatomy 0.000 abstract description 6
- 229920005989 resin Polymers 0.000 abstract description 6
- 239000011347 resin Substances 0.000 abstract description 6
- 238000010586 diagram Methods 0.000 description 5
- 230000000052 comparative effect Effects 0.000 description 3
- 229920002430 Fibre-reinforced plastic Polymers 0.000 description 2
- 239000004952 Polyamide Substances 0.000 description 2
- 239000004698 Polyethylene Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000011151 fibre-reinforced plastic Substances 0.000 description 2
- 229920003023 plastic Polymers 0.000 description 2
- 239000004033 plastic Substances 0.000 description 2
- 229920002647 polyamide Polymers 0.000 description 2
- 229920000728 polyester Polymers 0.000 description 2
- -1 polyethylene Polymers 0.000 description 2
- 229920000573 polyethylene Polymers 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 241000555745 Sciuridae Species 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- 229920001169 thermoplastic Polymers 0.000 description 1
- 239000004416 thermosoftening plastic Substances 0.000 description 1
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/44—Mechanical structures for providing tensile strength and external protection for fibres, e.g. optical transmission cables
- G02B6/4479—Manufacturing methods of optical cables
- G02B6/4489—Manufacturing methods of optical cables of central supporting members of lobe structure
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
Abstract
Description
【発明の詳細な説明】
〈産業上の利用分舒〉
本発明は、周面に光ファイバや電線等を収納・保持する
ねじれ溝を有し、光ケーブルや通信用銅ケーブル等の製
造に使用される溝付スペーサの製造方法に関し、更に詳
言すると、歪みのないねじれ溝を有する溝付スペーサが
容易に製造できるように工夫したものである。[Detailed Description of the Invention] <Industrial Application> The present invention has a twisted groove on the circumferential surface for storing and holding optical fibers, electric wires, etc., and is used for manufacturing optical cables, communication copper cables, etc. More specifically, the method of manufacturing a grooved spacer is devised so that a grooved spacer having a distortion-free twisted groove can be easily manufactured.
〈従来の技術〉
第４図には溝付スペーサの一例を示す。この溝付スペー
サ０１は、中心に抗張力ＵＡ０２を備えたスペーサ本体
０３の周面に４本のねじれ溝０４が形成されてなり、ね
じれ溝ｏ４はねじれながらスペーサ本体０３の長手方向
に伸びている。また、このねじれ溝０４は一方向１こね
じれる螺旋状の場合と、スペーサ本体０３の長手方向に
関して一定間隔毎にねじれ方向が反転している場合とが
あり、図にはねじれ溝０４のねじれ方向が一定間隔毎に
反転してサインカーブ状となっている、いわゆるＳＺス
ペーサを示しである。なお、抗張力線０２は、鋼線、鋼
撚線、ＦＲＰ （繊維強化プラスチック）等からなり、
また、スペーサ本体０３は例えばポリエチレン、ポリア
ミド。<Prior Art> FIG. 4 shows an example of a grooved spacer. This grooved spacer 01 has four twisted grooves 04 formed on the circumferential surface of a spacer body 03 having a tensile strength UA02 at the center, and the twisted grooves o4 extend in the longitudinal direction of the spacer body 03 while being twisted. In addition, this twisted groove 04 may have a spiral shape with one twist in one direction, or the twist direction may be reversed at regular intervals in the longitudinal direction of the spacer body 03. This shows a so-called SZ spacer in which the spacer is reversed at regular intervals to form a sine curve. In addition, the tensile strength wire 02 is made of steel wire, steel stranded wire, FRP (fiber reinforced plastic), etc.
Further, the spacer body 03 is made of, for example, polyethylene or polyamide.
ポリエステル等の熱可塑性樹脂からなる。Made of thermoplastic resin such as polyester.
このような溝付スペーサは一般に、第５図に示すように
、原料供給用のニップル０５と押出成形される溝付スペ
ーサの形状を決定するダイス０６とを備えたクロスヘツ
ド０７に抗張力！ｔｓ０２を挿通し、該抗張力線０２及
びクロスヘツド０７の何れか一方又は両者を回転させな
がら押出被覆することにより製造されている。As shown in FIG. 5, such a grooved spacer generally has a crosshead 07 equipped with a nipple 05 for supplying raw materials and a die 06 that determines the shape of the grooved spacer to be extruded. It is manufactured by inserting the ts02 and extrusion coating the tensile strength wire 02 and/or the crosshead 07 while rotating either or both.
〈発明が解決しようとする問題点〉
上述したような製造方法では、抗張力線０２とクロスヘ
ツド０７との相対的な回転によりねじれ溝０４のねしれ
状態が決定されるが、溶融状態にある原料の熱可塑性樹
脂の粘性の影響により、一方の回転が他方に伝達され、
例えば抗張力線０２が予定外にねじれてしまい、ねじれ
溝０２の形状が設計とずれるという問題があった。この
問題は、ねじれ溝０４のねじれ方向が適宜間隔毎に反転
するいわゆるＳＺスペーサの製造において特に重大であ
り、第６図に示すように、理想的なサインカーブａのね
じれ溝を得ようとしても実際にはｂのようにずれたもの
しか得られなかった。<Problems to be Solved by the Invention> In the manufacturing method described above, the torsion state of the helical groove 04 is determined by the relative rotation between the tensile strength line 02 and the crosshead 07. Due to the effect of the viscosity of the thermoplastic, rotation from one side is transmitted to the other,
For example, there was a problem that the tensile strength line 02 was twisted unexpectedly, and the shape of the twisted groove 02 was deviated from the design. This problem is particularly serious in the manufacture of so-called SZ spacers in which the twist direction of the twist groove 04 is reversed at appropriate intervals. In reality, only deviations like b were obtained.
例えば、抗張力線；よそのままでクロスヘツドを回転さ
せろ場合、りｑスヘッドの回転が溶融樹脂を介して抗張
力線に伝達され、クロスヘツドの左右への各１８０”の
回転により抗張力線も左右者５０°程度回転してしまう
。勿論、この程度は抗張力線の剛性、太さによっても異
なる。For example, if the crosshead is rotated while the tensile strength line remains unchanged, the rotation of the squirrel head will be transmitted to the tensile strength line through the molten resin, and by rotating the crosshead 180" to the left and right, the tensile strength line will also rotate approximately 50 degrees on both sides. It will rotate.Of course, the degree of this will vary depending on the stiffness and thickness of the tensile strength line.
本発明は、このような事情に鑑み、設計通りのねじれ溝
を有する溝付スペーサを製造しうる溝付スペーサの製造
方法を提供することを目的とする。In view of such circumstances, an object of the present invention is to provide a method for manufacturing a grooved spacer that can manufacture a grooved spacer having a twisted groove as designed.
く問題点を解決するための手段〉
前記目的を達成する本発明の構成は、抗張力線に熱可塑
性樹脂を押出被覆することにより、周面に光ファイバ、
電線等を収納するねじれ溝を有する溝付スペーサを製造
する方法において、上記ねじれ溝を有するスペーサ本体
の内側に、該スペーサ本体を構成する熱可塑性樹脂の溶
融粘度より小さい溶融粘度を有する熱可塑性樹脂からな
る内層を設け、該内層の少なくとも外側部分が溶融状態
の下で上記スペーサ本体を押出被覆することを押出被覆
する。Means for Solving the Problems〉 The structure of the present invention that achieves the above-mentioned object is to coat the tensile strength wire with a thermoplastic resin by extrusion, thereby forming an optical fiber on the peripheral surface.
In a method for manufacturing a grooved spacer having a twisted groove for storing electric wires, etc., a thermoplastic resin having a melt viscosity lower than the melt viscosity of the thermoplastic resin constituting the spacer body is placed inside the spacer body having the twisted groove. and extrusion coating the spacer body, at least an outer portion of the inner layer being extrusion coated under molten conditions.
本発明において上記内層とスペーサ本体とは別々に押出
被覆してもよいし、同時に押出被覆してもよい。In the present invention, the inner layer and the spacer body may be extrusion coated separately or may be extrusion coated simultaneously.
予じめ抗張力線に内層まで被覆した後、スペーサ本体を
押出被覆すると、この被覆の際、スペーサ本体を構成す
る溶融した熱可塑性樹脂の熱により上記内層の少なくと
も外側が溶融するＯ即ち・内層の少なくとも外側部分カ
ダ溶融状態の下でスペーサ本体が押出被覆されろことに
なる。なお、この場合、内層側を予め加熱しておけばス
ペーサ本体被覆の際に該内層の外側が溶融し易くなる。After coating the tensile strength wire up to the inner layer in advance, if the spacer body is extruded and coated, during this coating, at least the outside of the inner layer will melt due to the heat of the molten thermoplastic resin that constitutes the spacer body. The spacer body will be extrusion coated while at least the outer portion of the spacer body is in a molten state. In this case, if the inner layer side is heated in advance, the outer side of the inner layer will easily melt when the spacer body is coated.
一方、例えハ２ ＠押出クロスヘツドなどにより、内層
とスペーサ本体とを同時に押出被覆するようにしても、
内層が溶融状態のときにスペーサ本体が押出被覆される
ことになる。On the other hand, even if the inner layer and the spacer body are extruded and coated at the same time using an extrusion crosshead or the like,
The spacer body will be extrusion coated while the inner layer is in the molten state.
このように、内層の少なくとも外側部分が溶融状態の下
で上記スペーサ本体を押出被覆すると、この際、抗張力
線あるいは押出ヘッドを回転させても、相互間の回転の
伝達が内房の溶融した少なくとも外側部分により吸収さ
れるので、ねじれ溝が設計通りに形成されろ。即ち、例
えば、押出ヘッドを回転させながらスペーサ本体を押出
被覆しても、溶融状態にある該スペーサ本体の原料の熱
可塑性樹脂の粘性を介しての回転力が、内層の溶融部分
で吸収され、直接抗張力線に伝わることがなくなる。In this way, when the spacer body is extruded and coated while at least the outer portion of the inner layer is in a molten state, even if the tensile strength line or the extrusion head is rotated, rotational transmission between the inner layer and at least the molten outer portion of the inner layer is prevented. Since it is absorbed by the part, the twisted groove should be formed as designed. That is, for example, even if the spacer body is extruded and coated while rotating the extrusion head, the rotational force through the viscosity of the thermoplastic resin that is the raw material of the spacer body in a molten state is absorbed by the molten part of the inner layer. The tensile force is no longer transmitted directly to the tensile line.
スペーサ本体を構成する熱可塑性樹脂としては、ポリエ
チレン、ポリアミド、ポリエステルなどを挙げることが
できるが、例えば高密度ポリエチレンの場合にはＭＦＲ
（メルトフロレート）が０．５〜５程度の溶融粘度を用
いるのが好ましい。一方、内層を構成する熱可塑性樹脂
も同様のものが使用できるが、例えば高密度ポリエチレ
ンの場合にはＭＦＲが１０〜５０程度の溶融粘度を有す
るものを用いるのが好ましい。なお、スペーサ本体は必
要に応じて複数の層で構成してもよく、また、内層の内
側に別の被覆石を設けても差支えない。Examples of the thermoplastic resin constituting the spacer body include polyethylene, polyamide, and polyester. For example, in the case of high-density polyethylene, MFR
It is preferable to use a melt viscosity of about 0.5 to 5 (melt fluorate). On the other hand, similar thermoplastic resins can be used for forming the inner layer, but for example, in the case of high-density polyethylene, it is preferable to use one having a melt viscosity with an MFR of about 10 to 50. Note that the spacer body may be composed of a plurality of layers as necessary, and another covering stone may be provided inside the inner layer.
また、抗張力線としては、鋼線、ステンレススチール線
、ＦＲＰＩ％、プラスチック線等の単線あるいは撚線な
と並びに鋼線等にプラスチック被覆を施したものを挙げ
ることができる。Further, examples of the tensile strength wire include steel wires, stainless steel wires, FRPI% wires, plastic wires, and other single wires or stranded wires, as well as steel wires coated with plastic.
〈実 施 例〉
実施例１
第１図に示すように、直径２．４開の鋼線からなる抗張
力線１にＭＦＲが３５の高密度ポリエチレンからなる内
Ｍ２を厚さ０．１５ｍｍに押出被覆し、直径２．７胴の
被覆鋼線３を準備した。この際の押出条件は、線速１０
ｍ／分、押出樹脂温度１８０℃、押出ニップル径２．６
ｍｍ、押出ダイ径２．８ｍｍであった。<Example> Example 1 As shown in Fig. 1, a tensile strength wire 1 made of a steel wire with a diameter of 2.4 mm was extruded and coated with an inner M2 made of high-density polyethylene with an MFR of 35 to a thickness of 0.15 mm. Then, a coated steel wire 3 having a diameter of 2.7 mm was prepared. The extrusion conditions at this time were a linear speed of 10
m/min, extrusion resin temperature 180℃, extrusion nipple diameter 2.6
mm, and the extrusion die diameter was 2.8 mm.
この被覆鋼線３をスペーサ本体押出被覆用クロスヘツド
４に押通し、該クロスヘツド４を回転させながらＭＦＲ
が０．３０の高密度ポリエチレンを押出被覆してスペー
サ本体を形成した。このときのクロスヘツド４に備えら
れたダイス５の穴形状、穴寸法は第２図に示す通りであ
った。この押出被覆の条件は、線速２ｍ／分、押出樹脂
温度１５０℃、押出ニップル径２．９ｍｍで、クロスヘ
ツド４の回転は±１００度の反転とし、反転周期は４回
／分とした。This coated steel wire 3 is pushed through the crosshead 4 for extrusion coating the spacer body, and while rotating the crosshead 4, the MFR is
The spacer body was formed by extrusion coating high density polyethylene having a diameter of 0.30. At this time, the hole shape and hole dimensions of the die 5 provided in the crosshead 4 were as shown in FIG. The conditions for this extrusion coating were a line speed of 2 m/min, an extrusion resin temperature of 150°C, an extrusion nipple diameter of 2.9 mm, a rotation of the crosshead 4 of ±100 degrees, and a reversal period of 4 times/min.
これにより第３図（ａｌに示す断面形状を有し、第３図
（ｂ）に示すように反転角度±１００度、ピッチ５００
ｍｍのねじれ溝６を有する直径８ｍｍのＳＺ型溝付ス
ペーサ７を得た。As a result, it has a cross-sectional shape as shown in FIG.
An SZ type grooved spacer 7 having a diameter of 8 mm and having a twisted groove 6 of mm in diameter was obtained.
この溝付スペーサ７のねじれ溝６はほぼθ＝ １００
幽（工Ｌ）となっており、理想的なねじれ溝となってい
た。なお、ここでθ（度）はスペーサ７のねじれ溝６の
基準点からのねじれ角度、１（ｍｍ）はスペーサの基準
点からの長さ、ｐ（ｍｍ）はピッチを示す。The twisted groove 6 of this grooved spacer 7 is approximately θ=100
It had a rough shape (engineering L), making it an ideal twisting groove. Here, θ (degrees) indicates the twist angle of the twisted groove 6 of the spacer 7 from the reference point, 1 (mm) indicates the length of the spacer from the reference point, and p (mm) indicates the pitch.
実施例２
２種類の熱可塑性樹脂を面心円状に同時に押出被覆でき
るクロスヘツド、いわゆる２Ｎｉ押出型クロスヘツドを
用いて実施例１と同様な溝付スペーサを製造した。Example 2 A grooved spacer similar to that of Example 1 was manufactured using a so-called 2Ni extrusion type crosshead, which is a crosshead capable of simultaneously extruding and coating two types of thermoplastic resins in a face-centered circle.
２層押出型クロスヘツドに直径２．４ｍｍの鋼線を挿通
し、第１層の内層にはＭＦＲ３５の高密度ポリエチレン
、第２層のスペーサ本体にはＭＦＲｏ、３０の高密度ポ
リエチレンを使用し、線速２ｍ／分で同時に押出被覆し
た。A steel wire with a diameter of 2.4 mm is inserted into a two-layer extruded crosshead, and the inner layer of the first layer is made of high-density polyethylene with an MFR of 35.The inner layer of the second layer is made of high-density polyethylene with an MFR of 30. Coating was carried out simultaneously by extrusion at a speed of 2 m/min.
なお、この押出時の樹脂温度は１５０℃とし、第１層と
なる内層押出用のニップルは径２．５ｍｍ１ダイ（第２
層のスペーサ本体用のポイントを兼ねろ）は径２．６ｍ
ｍ、第２層のスペーサ本体用のダイは実施例１と同様第
３図に示す穴形状、寸法を有するものを用いた。また、
クロスヘツドの回転は実施例１と同様とした。The resin temperature during this extrusion was 150°C, and the nipple for extruding the inner layer, which is the first layer, was 1 die with a diameter of 2.5 mm (the second
The diameter of the layer (which also serves as a point for the spacer body) is 2.6 m.
m. The die for the second layer spacer body had the hole shape and dimensions shown in FIG. 3, as in Example 1. Also,
The rotation of the crosshead was the same as in Example 1.
これにより直径８ｍｍ、反転角度±１００度、ピッチ５
００ ｍｍのＳＺ型溝付スペーサを得た。This results in a diameter of 8 mm, an inversion angle of ±100 degrees, and a pitch of 5
00 mm SZ type grooved spacer was obtained.
この溝付スペーサのねじれ溝のねじれ状態を調べたとこ
ろ、実施例１と同様に、はぼθ＝ １０００Ｉ１１（１
「）となっていた。When the twisted state of the twisted groove of this grooved spacer was investigated, it was found that, as in Example 1, θ = 1000I11 (1
).
実施例３
鋼線上に被覆する内層をＭＦＲ６，０の高密度ポリエチ
レンとし、被覆鋼線に実施例１と同様にスペーサ本体を
押出被覆する際の予熱温度を１７０℃とする以外は実施
例１と同様に処理し、実施例１と同様のＳＺ型溝付スペ
ーサを得た。Example 3 Same as Example 1, except that the inner layer coated on the steel wire was made of high-density polyethylene with an MFR of 6.0, and the preheating temperature when extruding and coating the coated steel wire with the spacer body was 170°C. The same process was carried out to obtain an SZ type grooved spacer similar to that of Example 1.
比較例１
直径２．４ｍｍの鋼線にＭＦＲ３，０の高密度ポリエチ
レンを厚さ０．１５ｍｍに被覆し、直径２．７ｍｍの被
覆鋼線を得た。このときの押出条件は、線速１０ｍ／分
、押出樹脂温度１７０℃、押出ニップル径２．６ｍｍ、
押出ダイ径２．８隅であった。Comparative Example 1 A steel wire with a diameter of 2.4 mm was coated with high-density polyethylene having an MFR of 3.0 to a thickness of 0.15 mm to obtain a coated steel wire with a diameter of 2.7 mm. The extrusion conditions at this time were a linear speed of 10 m/min, an extrusion resin temperature of 170°C, an extrusion nipple diameter of 2.6 mm,
The extrusion die diameter was 2.8 corners.
この被覆ｍ線を実施例１と同様のスペーサ本体押出被覆
用クロスヘツドに挿通し、実施例１と全く同一の条件で
ＭＦＲｏ、３０の高密度ポリエチレンからなるスペーサ
本体を押出被覆した。This coated m-wire was passed through a crosshead for extrusion coating of a spacer body similar to that in Example 1, and a spacer body made of MFRo, 30 high density polyethylene was extrusion coated under exactly the same conditions as in Example 1.
乙のようにして！４なＳＺ型ススペーサ本体ねじれを調
べたところ、その反転角が±７２度であり、予定の±１
００度のねじれ溝ではなかった。Do it like Otsu! When we investigated the torsion of the SZ type spacer body, we found that the inversion angle was ±72 degrees, which was ±1
It was not a 00 degree twist groove.
比較例２
回転クロスヘツド上１４５度とした以外は比較例１と同
様にして直径８１１１ｆｆＩのＳＺＺ溝付スペーサを得
た。この溝付スペーサの反転角はほぼ±１００度であっ
たが、第６図に示す曲線すのように理想的なサインカー
ブａとはずれたものであった。Comparative Example 2 A SZZ grooved spacer having a diameter of 8111ffI was obtained in the same manner as Comparative Example 1 except that the angle was 145 degrees above the rotating crosshead. The reversal angle of this grooved spacer was approximately ±100 degrees, but it deviated from the ideal sine curve a as shown in FIG.
〈発明の効果〉
以上、実施例とともに具体的に説明したように、本発明
にかかる溝付スペーサの製造方法によれば、歪みのない
設計通りのねじれ溝を有する溝付スペーサを得ることが
できろ。<Effects of the Invention> As described above in detail with the examples, according to the method for manufacturing a grooved spacer according to the present invention, it is possible to obtain a grooved spacer having a twisted groove as designed without distortion. reactor.
第１図は本発明の第１の実施例を示す説明図、第２図は
そのダイスの断面図、第３図（，１は第１実施例の溝付
スペーサの断面図、第３図（ｂ）はそのねじれ溝の状態
を示す説明図、第４図は従来技術にかかる溝付スペーサ
を示す説明図、第５図はその製造の一例を示す説明図、
第６図はそのねじれ溝の状態を示す説明図である。
図 面 中、
１は抗張力線、
２は内層、
３は被覆鋼線、
４はクロスヘツド１
５はダイス、
６はねじれ溝、
７は溝付スペーサである。
特 許 出 願 人
住友電気工業株式会社
代 理 人1 is an explanatory diagram showing the first embodiment of the present invention, FIG. 2 is a cross-sectional view of the die, and FIG. 3 is a cross-sectional view of the grooved spacer of the first embodiment. b) is an explanatory diagram showing the state of the twisted groove, FIG. 4 is an explanatory diagram showing a grooved spacer according to the prior art, and FIG. 5 is an explanatory diagram showing an example of its manufacture.
FIG. 6 is an explanatory diagram showing the state of the twisted groove. In the drawings, 1 is a tensile strength wire, 2 is an inner layer, 3 is a coated steel wire, 4 is a crosshead 1, 5 is a die, 6 is a twisted groove, and 7 is a grooved spacer. Patent application agent Sumitomo Electric Industries Co., Ltd.
Claims (1)
、周面に光ファイバ、電線等を収納するねじれ溝を有す
る溝付スペーサを製造する方法において、上記ねじれ溝
を有するスペーサ本体の内側に、該スペーサ本体を構成
する熱可塑性樹脂の溶融粘度より小さい溶融粘度を有す
る熱可塑性樹脂からなる内層を設け、該内層の少なくと
も外側部分が溶融状態の下で上記スペーサ本体を押出被
覆することを特徴とする溝付スペーサの製造方法。 ２）内層を設けた後、スペーサ本体を押出被覆する特許
請求の範囲第１項記載の溝付スペーサの製造方法。 ３）内層の外側にスペーサ本体を押出被覆する際、内層
側を予め加熱する特許請求の範囲第２項記載の溝付スペ
ーサの製造方法。 ４）内層とスペーサ本体とを同時に押出被覆する特許請
求の範囲第１項記載の溝付スペーサの製造方法。[Claims] 1) A method for producing a grooved spacer having a twisted groove on its peripheral surface for accommodating an optical fiber, an electric wire, etc. by extrusion coating a tensile strength wire with a thermoplastic resin, wherein the spacer has the above-mentioned twisted groove. An inner layer made of a thermoplastic resin having a melt viscosity lower than that of the thermoplastic resin constituting the spacer body is provided inside the spacer body, and the spacer body is extruded while at least an outer portion of the inner layer is in a molten state. A method for producing a grooved spacer characterized by coating. 2) The method for manufacturing a grooved spacer according to claim 1, wherein after providing the inner layer, the spacer body is coated by extrusion. 3) The method for manufacturing a grooved spacer according to claim 2, wherein the inner layer side is heated in advance when extrusion coating the spacer body on the outside of the inner layer. 4) The method for manufacturing a grooved spacer according to claim 1, wherein the inner layer and the spacer body are simultaneously extruded and coated.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62305917A JPH01147511A (en) | 1987-12-04 | 1987-12-04 | Production of grooves spacer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62305917A JPH01147511A (en) | 1987-12-04 | 1987-12-04 | Production of grooves spacer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH01147511A true JPH01147511A (en) | 1989-06-09 |
Family
ID=17950855
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62305917A Pending JPH01147511A (en) | 1987-12-04 | 1987-12-04 | Production of grooves spacer |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01147511A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5638478A (en) * | 1994-07-06 | 1997-06-10 | The Furukawa Electric Co., Ltd. | Optical fiber cable having a grooved spacer formed with one or more SZ-spiral grooves on its outer circumference along the longitudinal direction of the spacer the inverting angle of each groove being at least 180° |
| WO2000023839A1 (en) * | 1998-10-21 | 2000-04-27 | Sumitomo Electric Industries, Ltd. | Device and method for producing optical cable slot rod |
-
1987
- 1987-12-04 JP JP62305917A patent/JPH01147511A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5638478A (en) * | 1994-07-06 | 1997-06-10 | The Furukawa Electric Co., Ltd. | Optical fiber cable having a grooved spacer formed with one or more SZ-spiral grooves on its outer circumference along the longitudinal direction of the spacer the inverting angle of each groove being at least 180° |
| WO2000023839A1 (en) * | 1998-10-21 | 2000-04-27 | Sumitomo Electric Industries, Ltd. | Device and method for producing optical cable slot rod |
| EP1122572A1 (en) * | 1998-10-21 | 2001-08-08 | Sumitomo Electric Industries, Ltd. | Device and method for producing optical cable slot rod |
| EP1122572A4 (en) * | 1998-10-21 | 2002-06-19 | Sumitomo Electric Industries | Device and method for producing optical cable slot rod |
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