JP2009062660A - Plastic optical fiber producing machine - Google Patents

Plastic optical fiber producing machine Download PDF

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JP2009062660A
JP2009062660A JP2007233897A JP2007233897A JP2009062660A JP 2009062660 A JP2009062660 A JP 2009062660A JP 2007233897 A JP2007233897 A JP 2007233897A JP 2007233897 A JP2007233897 A JP 2007233897A JP 2009062660 A JP2009062660 A JP 2009062660A
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optical fiber
plastic optical
cooling device
outer diameter
cylinder
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JP5210575B2 (en
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Takeshi Kitayama
武史 北山
Hideki Kihara
英樹 木原
Atsushi Okumura
淳 奥村
Masamitsu Sekizawa
政光 関沢
Nobuyuki Ogawa
宜之 小川
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Mitsubishi Rayon Co Ltd
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Mitsubishi Rayon Co Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a plastic optical fiber producing machine enabling the outer diameter of optical fiber to be put under control in high stability without declining in optical fiber productivity through maintaining optical fiber spinning speed. <P>SOLUTION: The plastic optical fiber producing machine 10 is such that a spinneret 20 with one or more outlets via which a molten resin is extruded into a strand-shape is equipped with an adjacent heating cylinder 30, and a cooling device 40 is set in proximity thereto opposite to the spinneret 20 side of the heating cylinder 30. In this machine 10, the cooling device 40 has a multi cylindrical assembly for rectifying airflow blowing on the molten resin, and each of the cylinders constituting the assembly meets the relationship: L/S=0.5-15 (wherein, S is the opening area of the cylinder; and L is the length of the cylinder). <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

本発明は、プラスチック光ファイバを溶融紡糸する際に、外径変動を小さくできるプラスチック光ファイバの製造装置に関する。   The present invention relates to an apparatus for manufacturing a plastic optical fiber capable of reducing fluctuations in the outer diameter when melt spinning the plastic optical fiber.

従来、プラスチック光ファイバの紡糸製造は、図７に示すような製造装置１１０により行われていた。この製造装置１１０は、溶融樹脂を連続的に吐出する１つ以上の吐出口が円周状、千鳥状又は一直線状に配置された紡糸口金１２０と、該紡糸口金１２０の直下に設けられた保温筒１３０と、溶融紡糸されたプラスチック光ファイバを冷却するための冷却装置１４０とからなっている。例えば、紡糸口金１２０から溶融紡糸されたプラスチック光ファイバＺは保温筒１３０の内部を通過後、冷却装置１４０から吹き出された冷却風により冷却され、その後、ガイド１５０を経てニップロール１７０により引き取られて延伸工程へと送られる。   Conventionally, spinning production of a plastic optical fiber has been performed by a production apparatus 110 as shown in FIG. This manufacturing apparatus 110 includes a spinneret 120 in which one or more discharge ports for continuously discharging a molten resin are arranged in a circumferential shape, a staggered shape, or a straight line, and a heat insulating material provided immediately below the spinneret 120. It comprises a cylinder 130 and a cooling device 140 for cooling the melt-spun plastic optical fiber. For example, the plastic optical fiber Z melt-spun from the spinneret 120 is cooled by the cooling air blown from the cooling device 140 after passing through the inside of the heat insulating tube 130, and then drawn by the nip roll 170 through the guide 150 and drawn. Sent to the process.

このようなプラスチック光ファイバの製造では、紡糸工程での外径の均一性が、得られるプラスチック光ファイバの外径の均一性に大きな影響を与える。紡糸工程で外径が不均一なプラスチック光ファイバが紡糸されて延伸工程に送られると、外径が細い部分に大きな引張張力が集中し、その部分がさらに細くなってしまうため、外径の不均一性が増してしまう。したがって、得られるプラスチック光ファイバの外径を均一にするためには、紡糸工程での外径変動の制御が非常に重要である。   In the production of such a plastic optical fiber, the uniformity of the outer diameter in the spinning process greatly affects the uniformity of the outer diameter of the obtained plastic optical fiber. When a plastic optical fiber with a non-uniform outer diameter is spun in the spinning process and sent to the drawing process, a large tensile tension concentrates on the part with a thin outer diameter, and the part becomes even thinner. Uniformity increases. Therefore, in order to make the outer diameter of the obtained plastic optical fiber uniform, it is very important to control the outer diameter fluctuation in the spinning process.

紡糸工程で生じるプラスチック光ファイバの外径変動には、規則的で周期性のある外径変動と、不規則的で周期性のない外径変動とがある。規則的で周期性のある外径変動を引き起こす要因の一つとしては、定量ポンプの吐出量の変動の影響が考えられる。この外径変動を制御する方法としては、例えば、計量用のギヤポンプの一次樹脂圧力を一定にする方法が示されている（特許文献１）。また、複数のギヤ式定量ポンプを用いて溶融樹脂を吐出量の変動周期の位相が異なる複数の原料流に分配し、これらの複数の原料流を、吐出量の変動周期の位相が打ち消されるように組み合わせて合流させることにより、吐出量の変動を制御する方法が示されている（特許文献２）。しかし、これらの技術では、規則的で周期性のある外径変動は制御できても不規則的で周期性のない外径変動の制御は困難である。   The outer diameter fluctuation of the plastic optical fiber that occurs in the spinning process includes an outer diameter fluctuation that is regular and periodic, and an outer diameter fluctuation that is irregular and not periodic. One of the factors causing regular and periodic fluctuations in the outer diameter is considered to be the effect of fluctuations in the discharge amount of the metering pump. As a method of controlling the outer diameter fluctuation, for example, a method of making the primary resin pressure of a metering gear pump constant is shown (Patent Document 1). In addition, using a plurality of gear-type metering pumps, the molten resin is distributed to a plurality of raw material streams having different phases of the discharge amount fluctuation period, and the phase of the fluctuation period of the discharge amount is canceled out for these plural raw material streams. A method for controlling fluctuations in the discharge amount by combining them together is disclosed (Patent Document 2). However, with these techniques, it is difficult to control irregular and non-periodic outer diameter fluctuations even though regular and periodic outer diameter fluctuations can be controlled.

不規則的で周期性のない外径変動を制御する方法としては、冷却風を吹き出す冷却装置において、冷却風の上部の風向きを斜上向きに変化させる方法が示されている（特許文献３）。しかし、特許文献３の技術では、冷却風の吹き出し口と通過するプラスチック光ファイバとの距離によって、各プラスチック光ファイバ間に外径変動の差が生じるという問題があった。また、異なる品種のプラスチック光ファイバを製造する際には、その都度煩雑な風速の微調整が必要であった。   As a method for controlling irregular and non-periodic outer diameter fluctuations, a method of changing the wind direction of the upper part of the cooling air to an obliquely upward direction in a cooling device that blows out cooling air is disclosed (Patent Document 3). However, the technique of Patent Document 3 has a problem in that a difference in outer diameter variation occurs between the plastic optical fibers depending on the distance between the cooling air blowing port and the passing plastic optical fiber. Further, when manufacturing different types of plastic optical fibers, complicated fine adjustment of the wind speed is required each time.

特許文献４には、保温筒に冷却風が入り込まないような遮断板と、風速と温度を個別に設定できる多段構造型の冷却装置とを設け、上段部分から徐々に低い温度の風を吹きつけて溶融紡糸したプラスチック光ファイバを冷却することにより、得られるプラスチック光ファイバの外径変動を制御する方法が示されている。特許文献４の技術は、品種による煩雑な風速の微調整もなく、プラスチック光ファイバの外径変動を小さく制御できる。
特開平２−２４９２３号公報 特開平５−１１１２７号公報 特開平４−２２５３０３号公報 特開２００５−４２２４７号公報 Patent Document 4 is provided with a shield plate that prevents cooling air from entering the heat retaining cylinder and a multi-stage structure type cooling device that can individually set the wind speed and temperature, and blows wind at a gradually lower temperature from the upper part. A method for controlling fluctuations in the outer diameter of the obtained plastic optical fiber by cooling the melt-spun plastic optical fiber is shown. The technique of Patent Document 4 can control the outer diameter fluctuation of the plastic optical fiber to be small without complicated fine adjustment of the wind speed depending on the product type.
JP-A-2-24923 JP-A-5-11127 JP-A-4-225303 JP 2005-42247 A

しかし、保温筒内で発生した温風等により、冷却装置から吹き出される冷却風の方向が乱される場合があり、外径変動を充分に制御しきれないことがあった。したがって、得られるプラスチック光ファイバの外径変動がより安定に制御できる、プラスチック光ファイバの製造装置が望まれている。
そこで、本発明では、紡糸速度を維持して生産性を落とすことなく、高い安定性で外径変動が制御できるプラスチック光ファイバの製造装置を目的とする。 However, the direction of the cooling air blown out from the cooling device may be disturbed by the warm air generated in the heat insulating cylinder, and the outer diameter fluctuation may not be fully controlled. Therefore, a plastic optical fiber manufacturing apparatus that can more stably control the outer diameter variation of the obtained plastic optical fiber is desired.
Accordingly, an object of the present invention is to provide a plastic optical fiber manufacturing apparatus capable of controlling fluctuations in the outer diameter with high stability without reducing the productivity by maintaining the spinning speed.

本発明は、溶融樹脂をストランド状に吐出する一つ以上の吐出口を有する紡糸口金に、保温筒が隣接して設けられ、該保温筒の紡糸口金側と反対側に、冷却装置が近接して設けられた製造装置であって、前記冷却装置が、溶融樹脂に吹き付ける風を整流するための多筒集合体を有しており、該多筒集合体を形成する各筒状体の開口面積Ｓと長さＬとが、Ｌ／Ｓ＝０．５〜１５であるプラスチック光ファイバの製造装置を提供する。   In the present invention, a heat insulating cylinder is provided adjacent to a spinneret having one or more discharge ports for discharging molten resin in a strand shape, and a cooling device is provided close to the side of the heat insulating cylinder opposite to the spinneret side. The cooling device has a multi-cylinder assembly for rectifying the wind blown to the molten resin, and the opening area of each cylindrical body forming the multi-cylinder assembly A plastic optical fiber manufacturing apparatus in which S and length L are L / S = 0.5 to 15 is provided.

本発明のプラスチック光ファイバの製造装置によれば、高い生産性を保ったまま、外径変動が小さく抑えられたプラスチック光ファイバが高い安定性で製造できる。   According to the plastic optical fiber manufacturing apparatus of the present invention, it is possible to manufacture with high stability a plastic optical fiber in which fluctuations in the outer diameter are suppressed while maintaining high productivity.

以下、本発明のプラスチック光ファイバの製造装置の一実施形態例について、図１〜５に基づいて詳細に説明する。
本発明のプラスチック光ファイバの製造装置１０は、図１に示すように、紡糸口金２０、保温筒３０、冷却装置４０、ガイド５０、外径計測器６０、及びニップロール７０を備えている。 Hereinafter, an embodiment of a plastic optical fiber manufacturing apparatus according to the present invention will be described in detail with reference to FIGS.
As shown in FIG. 1, the plastic optical fiber manufacturing apparatus 10 of the present invention includes a spinneret 20, a heat retaining cylinder 30, a cooling device 40, a guide 50, an outer diameter measuring device 60, and a nip roll 70.

紡糸口金２０には、例えば、円周状、千鳥状或いは一直線状に配置された一つ以上の吐出口が設けられる。また、紡糸口金２０の直下に保温筒３０が備え付けられる。保温筒３０の下側には溶融紡糸されたプラスチック光ファイバが通過するための開口部３２が設けられる。また、保温筒３０の下には、溶融紡糸されたプラスチック光ファイバを冷却するための冷却装置４０が設けられる。   The spinneret 20 is provided with, for example, one or more discharge ports arranged in a circumferential shape, a staggered shape, or a straight line shape. In addition, a heat retaining cylinder 30 is provided immediately below the spinneret 20. An opening 32 for allowing a melt-spun plastic optical fiber to pass through is provided below the heat retaining cylinder 30. A cooling device 40 for cooling the melt-spun plastic optical fiber is provided under the heat retaining cylinder 30.

本実施形態例の冷却装置は、図１に示すように、冷却装置４０を３段重ね、風速及び温度が個別に設定できる３段構造型（以下、３段重ねにした各冷却装置４０を、上段から順に上段冷却装置４０ａ、中段冷却装置４０ｂ、下段冷却装置４０ｃとする。）である。冷却装置は、単独で使用してもよく、上記のように複数積み重ねて使用してもよい。
冷却装置４０を複数積み重ねて使用して溶融紡糸されたプラスチック光ファイバを冷却する際は、上側にある冷却装置からの冷却風の温度よりも下側にある冷却装置からの冷却風の温度の方が低くなるように設定するのがよい。例えば、図１では、上段冷却装置４０ａよりも中段冷却装置４０ｂ、中段冷却装置４０ｂよりも下段冷却装置４０ｃの方が、冷却風の温度が低くなるのがよい。また、中段冷却装置４０ｂと下段冷却装置４０ｃからの冷却風は、上段冷却装置からの冷却風の温度より低ければ、同じ温度であっても構わない。このようにすることで、プラスチック光ファイバの外径変動が制御し易くなる。
また、冷却装置４０は、図２に示すように、例えば、ブロア４１、抵抗体４２、冷温水コイル４３、多筒集合体４５等の部品が備えられるが、設定した温度の、均一な冷却風を吹き出せるものであれば部品の種類や、その数量及び配置は特に限定されない。
まず、ブロア４１により吹き出された風が抵抗体４２により拡散された後に、冷温水コイル４３に送られる。冷温水コイル４３には外部の冷温水循環装置４４から循環水が供給されており、この循環水の温度をフィードバック制御することにより冷却風の温度が調節される。冷温水コイル４３を通過した風は、吹き溜まり部ｄで一旦吹き溜まり、均一にされた後、多筒集合体４５のそれぞれの筒状体４６から吹き出される。 As shown in FIG. 1, the cooling device according to the present embodiment has a three-stage structure in which the cooling devices 40 are stacked in three stages, and the wind speed and temperature can be individually set (hereinafter, each cooling device 40 in three stages is These are the upper cooling device 40a, the middle cooling device 40b, and the lower cooling device 40c in order from the upper stage). A cooling device may be used independently and may be used by stacking two or more as mentioned above.
When cooling a melt-spun plastic optical fiber using a plurality of cooling devices 40, the temperature of the cooling air from the cooling device below is lower than the temperature of the cooling air from the cooling device on the upper side. Should be set to be low. For example, in FIG. 1, the temperature of the cooling air is preferably lower in the middle cooling device 40b than in the upper cooling device 40a and in the lower cooling device 40c than in the middle cooling device 40b. Further, the cooling air from the middle cooling device 40b and the lower cooling device 40c may be the same temperature as long as it is lower than the temperature of the cooling air from the upper cooling device. By doing in this way, the outer diameter fluctuation | variation of a plastic optical fiber becomes easy to control.
As shown in FIG. 2, the cooling device 40 includes components such as a blower 41, a resistor 42, a cold / hot water coil 43, and a multi-tubular assembly 45. If it can blow out, the kind of parts, the quantity, and arrangement | positioning will not be specifically limited.
First, the wind blown by the blower 41 is diffused by the resistor 42 and then sent to the cold / hot water coil 43. Circulating water is supplied to the cold / hot water coil 43 from an external cold / hot water circulation device 44, and the temperature of the cooling air is adjusted by feedback control of the temperature of the circulating water. The wind that has passed through the cold / hot water coil 43 is once accumulated in the accumulation portion d and is made uniform, and then blown out from each cylindrical body 46 of the multi-cylinder assembly 45.

本発明のプラスチック光ファイバの製造装置１０の特徴は、冷却装置４０が多筒集合体４５を有していることにある。従来のプラスチック光ファイバの製造装置では、冷却装置から吹き出す冷却風全体を金網等により一括して整流していたため、高い整流効果が得られていなかった。そのため、保温筒３０内から吹き出してくる温風等によって冷却風が乱される場合があり、得られるプラスチック光ファイバの外径変動が制御しきれないことがあった。しかし、本発明の製造装置１０では、多筒集合体４５を利用し、冷却装置４０から吹き出す冷却風をそれぞれの筒状体４６により整流する。このようにすれば、各筒状体４６により冷却風を分割して別々に整流でき、さらに筒状体の長さを長くすれば整流効果を非常に高くすることができる。そのため、冷却装置４０から吹き出された冷却風は、保温筒３０から吹き出される温風等によって乱されることなく直進するため、プラスチック光ファイバの外径変動が所望の通りに制御できる。
本発明のプラスチック光ファイバの製造装置１０では、多筒集合体４５を形成する各筒状体４６は、該筒状体４６の開口面積Ｓと長さＬとが、Ｌ／Ｓ＝０．５〜１５となるようにする。筒状体４６の開口面積Ｓと長さＬとの関係は、Ｌ／Ｓ＝１〜１２の範囲であるのが好ましい。Ｌ／Ｓが１５以下であれば冷却装置から冷却風を吹き出すのに大きなエネルギーが必要なくなるため、経済性が高くなる。また、Ｌ／Ｓが０．５以上であれば、冷却装置から吹き出される冷却風が充分に整流され、吹き出された冷却風の方向が安定する。 The plastic optical fiber manufacturing apparatus 10 according to the present invention is characterized in that the cooling device 40 has a multi-cylinder assembly 45. In the conventional plastic optical fiber manufacturing apparatus, the entire cooling air blown from the cooling device is rectified in a lump with a wire mesh or the like, so that a high rectifying effect has not been obtained. For this reason, the cooling air may be disturbed by the warm air blown out from the inside of the heat insulating cylinder 30, and the outer diameter fluctuation of the obtained plastic optical fiber may not be fully controlled. However, in the manufacturing apparatus 10 of the present invention, the multi-cylinder assembly 45 is used to rectify the cooling air blown from the cooling device 40 by the respective cylindrical bodies 46. In this way, the cooling air can be divided and rectified separately by each cylindrical body 46, and if the length of the cylindrical body is further increased, the rectifying effect can be greatly increased. Therefore, the cooling air blown out from the cooling device 40 goes straight without being disturbed by the hot air blown out from the heat retaining cylinder 30 and so on, so that the outer diameter fluctuation of the plastic optical fiber can be controlled as desired.
In the plastic optical fiber manufacturing apparatus 10 of the present invention, each cylindrical body 46 forming the multi-cylinder assembly 45 has an opening area S and a length L of the cylindrical body 46 such that L / S = 0.5. To be ~ 15. The relationship between the opening area S and the length L of the cylindrical body 46 is preferably in the range of L / S = 1-12. If L / S is 15 or less, a large amount of energy is not required to blow cooling air from the cooling device, so that economic efficiency is improved. Moreover, if L / S is 0.5 or more, the cooling air blown out from the cooling device is sufficiently rectified, and the direction of the blown cooling air is stabilized.

冷却装置４０の多筒集合体４５としては、例えば、図３に示すようなハニカムを用いることができる。この場合にはアルミハニカムであるのが好ましいが、これに限定されない。また、ハニカム以外であってもよく、例えば、断面四角形、断面五角形、断面円形等の筒状体の集合体であってもよく、いくつかの種類の筒状体を混合して集合体としたものであってもよい。また、各筒状体のＬ／Ｓ値は０．５〜１５の範囲であれば異なっていてもよい。   As the multi-tube aggregate 45 of the cooling device 40, for example, a honeycomb as shown in FIG. 3 can be used. In this case, an aluminum honeycomb is preferable, but not limited thereto. Further, it may be other than the honeycomb, for example, it may be an aggregate of cylindrical bodies such as a quadrilateral cross section, a pentagonal cross section, a circular cross section, etc., and several kinds of cylindrical bodies are mixed to form an aggregate. It may be a thing. Further, the L / S value of each cylindrical body may be different as long as it is in the range of 0.5 to 15.

また、本発明の冷却装置４０は、図４に示すように、ブロア４１の多筒集合体４５側に、外部に設置された冷水循環装置４８から冷水が供給される冷水コイル４７と電気ヒータ４９とを設け、冷水コイル４７により冷却された風を電気ヒータ４９によって加熱することにより、設定した温度の冷却風とするものであっても構わない。このとき、冷水コイル４７はブロア４１よりも多筒集合体４５側にあっても、多筒集合体４５側と逆側にあってもよい。   Further, as shown in FIG. 4, the cooling device 40 of the present invention has a chilled water coil 47 and an electric heater 49 to which chilled water is supplied from a chilled water circulation device 48 installed on the outside of the blower 41 on the multi-tube assembly 45 side. And the air cooled by the cold water coil 47 is heated by the electric heater 49 so as to obtain the cooling air having a set temperature. At this time, the cold water coil 47 may be closer to the multi-cylinder assembly 45 than the blower 41 or may be opposite to the multi-cylinder assembly 45 side.

冷却装置４０（本実施形態例では上段冷却装置４０ａ）は、図１に示すように、冷却装置４０から出る冷却風のうち最も上側の冷却風が、保温筒３０のすぐ下側を通るように設けるのがよい。このように、冷却装置４０と保温筒３０との間の距離を小さくすることにより、保温筒３０から吹き出てくる温風により対流が生じるのを防ぎ易くなる。   As shown in FIG. 1, the cooling device 40 (upper cooling device 40 a in the present embodiment) allows the uppermost cooling air from the cooling device 40 to pass immediately below the heat retaining cylinder 30. It is good to provide. Thus, by reducing the distance between the cooling device 40 and the heat retaining cylinder 30, it becomes easy to prevent convection from being generated by the warm air blown from the heat retaining cylinder 30.

また、製造装置１０の保温筒３０には、保温筒３０内部の温度と気流を安定させるため、遮断板３１を設けてもよい。遮断板３１には、溶融紡糸されたプラスチック光ファイバが通過するための開口部３２が形成される（図１）。遮断板３１の設置は、冷却風の風速が０．４ｍ／ｓｅｃ以上の場合に効果的である。また、遮断板３１を設けていれば、上段冷却装置４０ａから吹き出された冷却風Ｘが保温筒３０内部へと侵入して、保温筒３０内部の気流を乱すことがなくなる。そのため、プラスチック光ファイバの外径変動を抑えることができる。また、例えば、図７に示すように遮断板を設けない場合には、保温筒１３０の冷却装置１４０から遠い側の内側面１３４に冷却風が衝突し、はね返った冷却風が冷却装置から遠い側にあるプラスチック光ファイバに集中して衝突するため、各プラスチック光ファイバ間の外径変動に差がでてしまうことがある。図１に示すように、遮断板３１を設けておけば、保温筒３０内への冷却風の侵入を防ぎ易く、保温筒３０の内側面３４への冷却風の衝突が防げるため、各プラスチック光ファイバ間の外径変動差を小さくし易い。   Further, the heat insulating cylinder 30 of the manufacturing apparatus 10 may be provided with a blocking plate 31 in order to stabilize the temperature and air flow inside the heat insulating cylinder 30. The blocking plate 31 is formed with an opening 32 through which the melt-spun plastic optical fiber passes (FIG. 1). The installation of the blocking plate 31 is effective when the wind speed of the cooling air is 0.4 m / sec or more. Further, if the blocking plate 31 is provided, the cooling air X blown out from the upper cooling device 40a does not enter the inside of the heat retaining cylinder 30 and disturb the airflow inside the heat retaining cylinder 30. Therefore, fluctuations in the outer diameter of the plastic optical fiber can be suppressed. Further, for example, as shown in FIG. 7, in the case where a blocking plate is not provided, the cooling air collides with the inner side surface 134 on the side far from the cooling device 140 of the heat insulating cylinder 130, and the rebounded cooling air is on the side far from the cooling device. Therefore, there is a case where a difference occurs in the outer diameter fluctuation between the plastic optical fibers. As shown in FIG. 1, if the blocking plate 31 is provided, it is easy to prevent the cooling air from entering the heat insulating cylinder 30 and the cooling air can be prevented from colliding with the inner side surface 34 of the heat insulating cylinder 30. It is easy to reduce the outer diameter fluctuation difference between fibers.

遮断板３１は、図５（ａ）、（ｂ）に示すような構造であるのが好ましい。図５（ａ）の遮断板３１は、保温筒３０内部へと傾斜して設けられている。一方、図５（ｂ）の遮断板は冷却装置４０側へと傾斜して設けられている。また、遮断板３１は、図５（ｃ）に示すような、水平に設置した遮断板３１に開口部３２を設け、該開口部３２の周縁部の保温筒内部側に側部３３ｃが形成されたものや、図５（ｄ）に示すような、開口部３２の周縁部に冷却装置側へと側部３３ｄが形成されたものであるのがより好ましい。また、水平に設けた遮断板３１に形成させる開口部３２の開口径が、プラスチック光ファイバに接触しない範囲でできるだけ小さく設けられた遮断板３１がさらに好ましい。また、遮断板３１は、図５（ｃ）、図５（ｄ）のように遮断板３１が水平に設けられ、該遮断板３１に開口部３２がプラスチック光ファイバ１本に対して１つずつ設けられているのが特に好ましい。   The blocking plate 31 preferably has a structure as shown in FIGS. The blocking plate 31 in FIG. 5A is provided to be inclined toward the inside of the heat insulating cylinder 30. On the other hand, the blocking plate in FIG. 5B is provided to be inclined toward the cooling device 40 side. Further, the shield plate 31 is provided with an opening 32 in the horizontally installed shield plate 31 as shown in FIG. 5C, and a side portion 33 c is formed on the inner side of the heat insulating cylinder at the peripheral portion of the opening 32. As shown in FIG. 5D, it is more preferable that the side portion 33d is formed on the peripheral portion of the opening portion 32 toward the cooling device side. Further, it is more preferable that the shielding plate 31 provided as small as possible in the range where the opening diameter of the opening 32 formed in the shielding plate 31 provided horizontally does not contact the plastic optical fiber. In addition, as shown in FIGS. 5C and 5D, the shielding plate 31 is horizontally provided, and the shielding plate 31 has one opening 32 for each plastic optical fiber. It is particularly preferred that it is provided.

例えば、本実施形態例のように、冷却装置４０を３段重ねて使用する際には、上段冷却装置４０ａから吹き出される冷却風の温度は、２０〜７０℃の範囲とするのがよい。前記冷却風の温度をこの範囲とすることで、該冷却風の風速が０．４ｍ／ｓｅｃ未満の場合でも、上段冷却装置４０ａからの冷却風による流体塊ｃと、紡糸口金２０からの輻射熱及びプラスチック光ファイバからの放熱により保温筒３０内部に発生した温度の高い流体塊ｂとの温度差により生じる流体塊ａの熱膨張が防ぎ易くなる（図１）。そのため、流体塊ａが流体塊ｃよりも軽くなって浮力が生じることが原因で発生する自然対流が抑えられるため、自然対流の断続的なプラスチック光ファイバへの衝突が起き難くなり、製造されるプラスチック光ファイバの外径変動が制御し易くなる。また、上段冷却装置４０ａからの冷却風の温度を２０℃以上とすれば、流体塊ａの部分の空気密度が小さくなるため、前記冷却風の方向が保たれ易くなる。また、上段冷却装置４０ａからの冷却風の温度を７０℃以下とすれば、中段冷却装置４０ｂ、下段冷却装置４０ｃからの冷却風との温度差が小さくでき、それにより生じる上昇気流により外径変動が大きくなることを防ぎ易くなる。   For example, when the cooling device 40 is used in three stages as in this embodiment, the temperature of the cooling air blown out from the upper cooling device 40a is preferably in the range of 20 to 70 ° C. By setting the temperature of the cooling air in this range, even when the wind speed of the cooling air is less than 0.4 m / sec, the fluid mass c by the cooling air from the upper cooling device 40a and the radiant heat from the spinneret 20 and It becomes easy to prevent thermal expansion of the fluid mass a caused by the temperature difference with the high temperature fluid mass b generated inside the heat retaining cylinder 30 due to heat radiation from the plastic optical fiber (FIG. 1). Therefore, natural convection caused by the fluid mass a being lighter than the fluid mass c and generating buoyancy is suppressed, and therefore, the natural convection is less likely to collide with the intermittent plastic optical fiber. It becomes easy to control the outer diameter variation of the plastic optical fiber. Further, if the temperature of the cooling air from the upper cooling device 40a is 20 ° C. or higher, the air density in the fluid mass a portion is reduced, so that the direction of the cooling air is easily maintained. Further, if the temperature of the cooling air from the upper cooling device 40a is 70 ° C. or less, the temperature difference between the cooling air from the middle cooling device 40b and the lower cooling device 40c can be reduced, and the outside diameter fluctuates due to the rising airflow generated thereby. It becomes easy to prevent that becomes large.

また、プラスチック光ファイバの表面温度を充分に低下させてから、ガイド５０やニップロール７０と接触させるため、中段冷却装置４０ｂ及び下段冷却装置４０ｃからの冷却風は、上段冷却装置４０ａよりも低い温度で、かつ５〜２５℃であるのが好ましい。また、下段冷却装置４０ｃからの冷却風の温度は、中段冷却装置４０ｂの冷却風の温度以下に設定される。このような温度範囲とすることで、プラスチック光ファイバがガイド５０やニップロール７０に接触する際の、傷等の欠陥の発生が防ぎ易くなる。また、中段冷却装置４０ｂ及び下段冷却装置４０ｃからの冷却風の風速は０．３〜１．５ｍ／ｓｅｃであるのが好ましい。   Further, since the surface temperature of the plastic optical fiber is sufficiently lowered and then brought into contact with the guide 50 and the nip roll 70, the cooling air from the middle cooling device 40b and the lower cooling device 40c is at a lower temperature than the upper cooling device 40a. And it is preferable that it is 5-25 degreeC. Further, the temperature of the cooling air from the lower cooling device 40c is set to be equal to or lower than the temperature of the cooling air of the middle cooling device 40b. By setting it as such a temperature range, it becomes easy to prevent generation | occurrence | production of defects, such as a crack, when a plastic optical fiber contacts the guide 50 or the nip roll 70. FIG. Moreover, it is preferable that the wind speed of the cooling air from the intermediate | middle stage cooling device 40b and the lower stage cooling device 40c is 0.3-1.5 m / sec.

上段冷却装置４０ａからの冷却風の風速は０．２〜０．８ｍ／ｓｅｃであるのがよく、温度が２０〜７０℃であれば、品種ごとに風速を調整しなくとも、高い安定性でほとんどのプラスチック光ファイバの外径変動が制御できる。ここで、冷却風の風速の斑は、各段の冷却装置４０から吹き出される冷却風それぞれについて、各段の平均流速から±０．１ｍ／ｓｅｃの範囲内であるのが好ましい。また、温度斑についても、格段の冷却装置４０からの冷却風それぞれについて、各段の平均温度から±１℃の範囲であるのが好ましい。   The wind speed of the cooling air from the upper cooling device 40a should be 0.2 to 0.8 m / sec. If the temperature is 20 to 70 ° C., it is highly stable without adjusting the wind speed for each product type. The outer diameter fluctuation of most plastic optical fibers can be controlled. Here, it is preferable that the variation in the wind speed of the cooling air is within a range of ± 0.1 m / sec from the average flow velocity of each stage for each cooling air blown from the cooling device 40 of each stage. Further, the temperature spots are preferably within a range of ± 1 ° C. from the average temperature of each stage for each cooling air from the exceptional cooling device 40.

尚、本実施形態例では、冷却装置４０を３段重ねたものを説明したが、それ以上の多段構造型であってもよい。例えば、上段冷却装置４０ａをさらに多段に分割し、プラスチック光ファイバに吹き付ける冷却風の温度が２０〜７０℃で、上段から下段に向かって温度が低くなるような設定としてもよい。
また、保温筒３０の長さｅ及び上段冷却装置４０ａの高さｆは、プラスチック光ファイバＹが冷却固化されるまでの時間及び紡糸速度によって適宜設定できるが、共に５０〜５００ｍｍの範囲とするのが好ましい。 In the present embodiment, the cooling device 40 is described as being stacked in three stages, but a multi-stage structure type may be used. For example, the upper cooling device 40a may be further divided into multiple stages so that the temperature of the cooling air blown onto the plastic optical fiber is 20 to 70 ° C., and the temperature decreases from the upper stage toward the lower stage.
The length e of the heat insulating cylinder 30 and the height f of the upper cooling device 40a can be set as appropriate depending on the time until the plastic optical fiber Y is cooled and solidified and the spinning speed, but both are in the range of 50 to 500 mm. Is preferred.

以下、実施例及び比較例を示し、本発明を詳細に説明する。尚、本発明は以下の記載によって限定されない。
実施例及び比較例における評価方法は以下に示す通りである。
［プラスチック光ファイバの外径変動率］
紡糸工程後のプラスチック光ファイバの外径をキーエンス（株）製のレーザ外径測定器（図１の外径測定器６）により、サンプル間隔０．１ｓｅｃ、サンプル時間３０ｍｉｎで測定し、この外径測定結果から標準偏差を求めた。次に、この標準偏差の３倍値（３σ）を外径変動とし、この値を用いて外径変動率を求めた。尚、外径変動率とは式（１）で算出される。
Ａ＝（Ｂ／Ｃ）×１００ ・・・（１）
ここで、Ａは外径変動率（％）、Ｂは標準偏差の３倍値（３σ）、Ｃは平均外径を示す。 EXAMPLES Hereinafter, an Example and a comparative example are shown and this invention is demonstrated in detail. In addition, this invention is not limited by the following description.
Evaluation methods in Examples and Comparative Examples are as shown below.
[Outer diameter fluctuation rate of plastic optical fiber]
The outer diameter of the plastic optical fiber after the spinning process was measured with a laser outer diameter measuring device (outer diameter measuring device 6 in FIG. 1) manufactured by Keyence Corporation at a sample interval of 0.1 sec and a sample time of 30 min. The standard deviation was determined from the measurement results. Next, the value of three times the standard deviation (3σ) was defined as the outer diameter fluctuation, and the outer diameter fluctuation rate was determined using this value. The outer diameter fluctuation rate is calculated by the equation (1).
A = (B / C) × 100 (1)
Here, A is the outer diameter fluctuation rate (%), B is the standard deviation three times (3σ), and C is the average outer diameter.

［外径変動差］
冷却装置に一番遠い側のプラスチック光ファイバの外径変動率（Ａ１）と、一番近い側のプラスチック光ファイバの外径変動率（Ａ２）とを用いて外径変動差ＡＴ（％）を求めた。
ＡＴ＝ ｜（Ａ１）−（Ａ２）｜ [Outer diameter fluctuation difference]
Outer diameter fluctuation of the plastic optical fiber of the farthest side in a cooling device and (A 1), the outer diameter fluctuation of the plastic optical fiber of the closest side (A 2) outer diameter fluctuation difference with the A T ( %).
A T = | (A 1 ) − (A 2 ) |

［実施例１］
芯材としてポリメチルメタクリレート（ＰＭＭＡ）、鞘材としてフッ化ビニリデン／テトラフルオロエチレン（８０／２０（ｍｏｌ％））を溶融樹脂として用いた。製造装置は、図１及び図２に示した装置構成で、紡糸口金２０は円周状に配置された４つの吐出口を有しており、保温筒３０の長さｆは３００ｍｍである。また、冷却装置４０ａの長さｇは３００ｍｍである。冷却装置４０を形成する多筒集合体４５としてはアルミハニカムを用い、各筒状体４６の開口面積Ｓを１０ｍｍ２、長さＬを１００ｍｍとした（Ｌ／Ｓ＝１０）。遮断板３１は、図６に示すように、紡糸口金２０から紡出されたプラスチック光ファイバからの距離ｇが１２ｍｍ、開口径ｈが１００ｍｍとなるように開口部３２を設けた。ニップロールの引取速度を２０ｍ／ｍｉｎ、紡糸温度を２３０℃とし、上段冷却装置４０ａからの冷却風の温度を２５℃、風速を０．５ｍ／ｓｅｃとした。また、中段冷却装置４０ｂからの冷却風の温度を２０℃、風速を０．５ｍ／ｓｅｃとし、下段冷却装置４０ｃからの冷却風の温度を２０℃、風速を０．５ｍ／ｓｅｃとした。この製造装置１０によりファイバ外径７５０μｍのプラスチック光ファイバの製造を試みた。 [Example 1]
Polymethyl methacrylate (PMMA) was used as the core material, and vinylidene fluoride / tetrafluoroethylene (80/20 (mol%)) was used as the molten resin as the sheath material. The manufacturing apparatus has the apparatus configuration shown in FIGS. 1 and 2, the spinneret 20 has four outlets arranged circumferentially, and the length f of the heat retaining cylinder 30 is 300 mm. The length g of the cooling device 40a is 300 mm. As the multi-cylinder assembly 45 forming the cooling device 40, an aluminum honeycomb was used, the opening area S of each cylindrical body 46 was 10 mm 2 , and the length L was 100 mm (L / S = 10). As shown in FIG. 6, the blocking plate 31 was provided with an opening 32 so that the distance g from the plastic optical fiber spun from the spinneret 20 was 12 mm and the opening diameter h was 100 mm. The take-up speed of the nip roll was 20 m / min, the spinning temperature was 230 ° C., the temperature of the cooling air from the upper cooling device 40a was 25 ° C., and the wind speed was 0.5 m / sec. The temperature of the cooling air from the middle cooling device 40b was 20 ° C., the wind speed was 0.5 m / sec, the temperature of the cooling air from the lower cooling device 40c was 20 ° C., and the wind speed was 0.5 m / sec. An attempt was made to manufacture a plastic optical fiber having a fiber outer diameter of 750 μm using the manufacturing apparatus 10.

［実施例２］
多筒集合体４５を形成する各筒状体４６の開口面積Ｓを２０ｍｍ２、長さＬを１００ｍｍ（Ｌ／Ｓ＝５．０）とした以外は、実施例１と同様にプラスチック光ファイバの製造を行った。 [Example 2]
The plastic optical fiber is the same as in Example 1 except that the opening area S of each cylindrical body 46 forming the multi-cylinder assembly 45 is 20 mm 2 and the length L is 100 mm (L / S = 5.0). Manufactured.

［実施例３］
多筒集合体４５を形成する各筒状体４６の開口面積Ｓを７０ｍｍ２、長さＬを１００ｍｍ（Ｌ／Ｓ＝１．４）とした以外は、実施例１と同様にプラスチック光ファイバの製造を行った。 [Example 3]
The plastic optical fiber is the same as in Example 1 except that the opening area S of each cylindrical body 46 forming the multi-tubular assembly 45 is 70 mm 2 and the length L is 100 mm (L / S = 1.4). Manufactured.

［比較例１］
多筒集合体４５を形成する各筒状体４６の開口面積Ｓを３００ｍｍ２、長さＬを１００ｍｍ（Ｌ／Ｓ＝０．３）とした以外は、実施例１と同様にプラスチック光ファイバの製造を行った。 [Comparative Example 1]
The plastic optical fiber is the same as in Example 1 except that the opening area S of each cylindrical body 46 forming the multi-cylinder assembly 45 is 300 mm 2 and the length L is 100 mm (L / S = 0.3). Manufactured.

［比較例２］
多筒集合体４５を形成する各筒状体４６の開口面積Ｓを１０ｍｍ２、長さＬを２００ｍｍ（Ｌ／Ｓ＝２０）とした以外は、実施例１と同様にプラスチック光ファイバの製造を行った。
実施例１〜３及び比較例１〜２における各筒状体の条件と製造されたプラスチック光ファイバの評価を表１に示す。 [Comparative Example 2]
A plastic optical fiber is manufactured in the same manner as in Example 1 except that the opening area S of each cylindrical body 46 forming the multi-cylinder assembly 45 is 10 mm 2 and the length L is 200 mm (L / S = 20). went.
Table 1 shows the conditions of each cylindrical body and the evaluation of the manufactured plastic optical fiber in Examples 1 to 3 and Comparative Examples 1 and 2.

Figure 2009062660
Figure 2009062660

多筒集合体を形成する各筒状体の開口面積Ｓと長さＬが適切な条件である実施例１〜３では、製造されたプラスチック光ファイバの外径変動率が小さく、また、冷却装置に近い側と遠い側のプラスチック光ファイバの外径変動差も小さい。
一方、Ｌ／Ｓが小さい比較例１では、製造されたプラスチック光ファイバの外径変動率は大きく、また、冷却装置に近い側と遠い側のプラスチック光ファイバの外径変動差も大きい。同様に、Ｌ／Ｓが大きい比較例２でも、製造されたプラスチック光ファイバの外径変動率は大きく、また、冷却装置に近い側と遠い側のプラスチック光ファイバの外径変動差も大きい。 In Examples 1 to 3, in which the opening area S and length L of each cylindrical body forming the multi-cylinder aggregate are appropriate conditions, the outer diameter variation rate of the manufactured plastic optical fiber is small, and the cooling device The difference in the outer diameter of the plastic optical fiber on the near side and on the far side is also small.
On the other hand, in Comparative Example 1 where the L / S is small, the manufactured plastic optical fiber has a large outer diameter fluctuation rate, and the plastic optical fiber on the side closer to the cooling device and the far side has a large difference in outer diameter fluctuation. Similarly, in Comparative Example 2 where the L / S is large, the manufactured plastic optical fiber has a large outer diameter variation rate, and the outer diameter variation difference between the plastic optical fiber near and far from the cooling device is also large.

本発明のプラスチック光ファイバの製造装置によれば、高い安定性で、製造されるプラスチック光ファイバの外径変動が小さく抑えられ、各プラスチック光ファイバ間の外径変動差も小さくできる。このように、本発明の製造装置は、品質に優れたプラスチック光ファイバが安定的に製造できるため有用である。   According to the plastic optical fiber manufacturing apparatus of the present invention, the outer diameter fluctuation of the manufactured plastic optical fiber can be suppressed with high stability, and the outer diameter fluctuation difference between the plastic optical fibers can be reduced. Thus, the manufacturing apparatus of the present invention is useful because a plastic optical fiber excellent in quality can be stably manufactured.

本発明のプラスチック光ファイバの製造装置の一例を示す概略図である。It is the schematic which shows an example of the manufacturing apparatus of the plastic optical fiber of this invention. 図１の製造装置１０の冷却装置４０を詳細に示した概略図である。It is the schematic which showed the cooling device 40 of the manufacturing apparatus 10 of FIG. 1 in detail. 本発明の製造装置１０の多筒集合体４５を開口面側から見た正面図である。It is the front view which looked at the multicylinder aggregate | assembly 45 of the manufacturing apparatus 10 of this invention from the opening surface side. 図１の製造装置の冷却装置４０の他の形態を詳細に示した概略図である。It is the schematic which showed in detail the other form of the cooling device 40 of the manufacturing apparatus of FIG. 図１の製造装置の遮断板３０の構造を示す概略図である。It is the schematic which shows the structure of the shielding board 30 of the manufacturing apparatus of FIG. 実施例及び比較例に用いた遮断板を冷却装置４０側から見た正面図である。It is the front view which looked at the shielding board used for the Example and the comparative example from the cooling device 40 side. 従来のプラスチック光ファイバの製造装置を示した概略図である。It is the schematic which showed the manufacturing apparatus of the conventional plastic optical fiber.

符号の説明Explanation of symbols

１０ プラスチック光ファイバの製造装置
２０ 紡糸口金
３０ 保温筒
４０ 冷却装置
４５ 多筒集合体
４６ 筒状体 DESCRIPTION OF SYMBOLS 10 Plastic optical fiber manufacturing apparatus 20 Spinneret 30 Heat insulation cylinder 40 Cooling apparatus 45 Multi-cylinder assembly 46 Cylindrical body

Claims (1)

溶融樹脂をストランド状に吐出する一つ以上の吐出口を有する紡糸口金に、保温筒が隣接して設けられ、該保温筒の紡糸口金側と反対側に、冷却装置が近接して設けられた製造装置であって、
前記冷却装置が、溶融樹脂に吹き付ける風を整流するための多筒集合体を有しており、該多筒集合体を形成する各筒状体の開口面積Ｓと長さＬとが、Ｌ／Ｓ＝０．５〜１５であるプラスチック光ファイバの製造装置。 A heat insulating cylinder is provided adjacent to a spinneret having one or more discharge ports for discharging the molten resin in a strand shape, and a cooling device is provided adjacent to the side of the heat insulating cylinder opposite to the spinneret side. Manufacturing equipment,
The cooling device has a multi-cylinder assembly for rectifying the wind blown to the molten resin, and an opening area S and a length L of each cylindrical body forming the multi-cylinder assembly are L / Plastic optical fiber manufacturing apparatus with S = 0.5-15.
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CN109355719A (en) * 2018-12-04 2019-02-19 吴江精美峰实业有限公司 A kind of spinning multistage cross air blowing device
KR20190135409A (en) * 2018-05-28 2019-12-06 라이펜호이저 게엠베하 운트 코. 카게 마쉬넨파브릭 Apparatus for making spunbonded nonwovens from continuous filaments
CN116732623A (en) * 2023-06-19 2023-09-12 桐昆集团浙江恒通化纤有限公司 Moisture-absorbing sweat-releasing polyester fiber and preparation method thereof

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Publication number Priority date Publication date Assignee Title
KR20190135409A (en) * 2018-05-28 2019-12-06 라이펜호이저 게엠베하 운트 코. 카게 마쉬넨파브릭 Apparatus for making spunbonded nonwovens from continuous filaments
KR102399905B1 (en) 2018-05-28 2022-05-18 라이펜호이저 게엠베하 운트 코. 카게 마쉬넨파브릭 Apparatus for making spunbonded nonwovens from continuous filaments
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CN116732623A (en) * 2023-06-19 2023-09-12 桐昆集团浙江恒通化纤有限公司 Moisture-absorbing sweat-releasing polyester fiber and preparation method thereof
CN116732623B (en) * 2023-06-19 2024-02-20 桐昆集团浙江恒通化纤有限公司 Moisture-absorbing sweat-releasing polyester fiber and preparation method thereof

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