JP4506010B2

JP4506010B2 - Melt spinneret for core-sheath composite fiber

Info

Publication number: JP4506010B2
Application number: JP2001063127A
Authority: JP
Inventors: 隆安藤; 健一豊永; 繁儀鎌田
Original assignee: Toray Industries Inc
Current assignee: Toray Industries Inc
Priority date: 2001-03-07
Filing date: 2001-03-07
Publication date: 2010-07-21
Anticipated expiration: 2021-03-07
Also published as: JP2002266153A

Description

【０００１】
【発明の属する技術分野】
本発明は芯鞘複合繊維を安定して溶融紡糸しうる芯鞘複合繊維用溶融紡糸口金装置に関する。
【０００２】
【従来の技術】
従来より芯鞘複合繊維紡糸用口金装置については種々提案されており、例えば特開昭６３−１９０００７号公報や特開昭６３−２５６７０８号公報に口金板の紡糸孔に対応する分配孔を穿孔した分配板に芯成分ポリマーの流通するパイプが挿着され、該分配板の形状を規定して芯鞘複合斑が少ない均質な芯鞘複合繊維を得るための口金装置の提案がなされている。しかし、この口金装置は分配板にパイプが挿着されているため、紡糸後の口金の洗浄において分散板や口金板を個々に分解して洗浄することが出来ないことに伴う様々な問題点がある。例えば硝酸ナトリウム−亜硝酸ナトリウム系の塩を４２０℃以上に加熱し溶融した液の中で有機ポリマーを分解した洗浄方法（以下ソルト洗浄という）では、高温で有機ポリマーを分解するため、分解時に激しい衝撃が発生し、繰返しのソルト洗浄により機械的強度の弱いパイプ部に曲りや裂け目が生じるといった問題点がある。パイプ部が損傷を受けた口金を使用すると芯鞘複合において偏芯や断面変動率の増加が発生し、特に溶融粘度差の大きい２種類のポリマーを紡糸する場合、偏芯芯鞘複合による口金直下での糸条の曲りが発生し、最終的に糸切れに至り、操業性を悪化させるという問題があった。また、ポリエステル系ポリマーの場合、パイプに衝撃を加えないようにトリエチレングリコール溶液の沸騰液の中で、ポリマーを徐々に溶解させ洗浄する方法も挙げられるが、この方法では複雑な形状を持つ分配板の細部までポリマーを完全に洗浄することが出来ないという問題がある。
【０００３】
一方、特開平７−２１６６３０号公報に芯成分ポリマーを鞘成分ポリマーで被覆する際に鞘成分ポリマー用口金板に設けた環状の突出部により圧力損失効果を持たせ芯鞘複合斑の少ない芯鞘複合繊維を得るための口金装置の提案がなされている。この口金装置では紡糸後に口金を分解し洗浄することが可能であるが、鞘成分ポリマーは鞘成分ポリマー用口金板に設けた環状の突出部と芯成分ポリマー用口金板の微少な隙間で圧力損失を持たせるため、紡糸や洗浄時の高温条件下での使用により経時的に口金板に歪みが発生し、隙間の間隔に円周方向の斑が発生し芯鞘複合に偏芯を生じさせるという問題がある。
【０００４】
【発明が解決しようとする課題】
本発明の目的は、芯鞘複合繊維用溶融紡糸口金において口金の使用による経時的な芯鞘複合斑を抑制し、様々な粘度差をもつ芯成分ポリマ及び鞘成分ポリマを安定して溶融複合紡糸しうる芯鞘複合繊維用溶融紡糸口金装置を提供することにある。
【０００５】
【課題を解決するための手段】
本発明は上記課題を解決するために次の構成を有する。
すなわち、上部導入板、下部導入板、口金板の順序で積層してなる芯鞘複合繊維用溶融紡糸口金装置において、
１．上部導入板に芯成分ポリマーを供給する芯成分導入孔と鞘成分ポリマーを供給する鞘成分導入孔を穿設し、かつ該鞘成分ポリマーを該上部導入板の下部で分配できる分配流路と煙突部を該上部導入板に有してなり、
２．下部導入板に前記上部導入板に穿設した芯成分導入孔と前記煙突部と連通した芯成分導入連通孔を設け、該芯成分導入連通孔の周りには鞘成分分配用導入孔を３〜６穿設し、該芯成分導入孔の下部に芯成分絞り部、該鞘成分分配用導入孔の下部に鞘成分絞り部を設けてなり、
３．口金板の上部に、前記芯成分導入連通孔および鞘成分分配用導入孔より供給されるポリマーを芯鞘複合させる合流部、該合流部に連通する吐出孔および該吐出孔の絞り部を有してなり、かつ、
４．前記鞘成分絞り部、前記吐出孔絞り部の孔深度および孔径が、後述する式（１）に示す圧力Ｐ１と、後述する式（２）および（３）に示す圧力Ｐ２においてＰ１≧Ｐ２を満たすように設計されてなる芯鞘複合繊維用溶融紡糸口金装置である。
【０００６】
【発明の実施の形態】
以下本発明の芯鞘複合繊維紡糸用口金装置について図面によって詳細に説明する。
【０００７】
図１は本発明の芯鞘複合繊維紡糸用口金装置の一例を示す縦断面図であり、図２は図１における合流部１１の要部を示す図である。
【０００８】
図１において、上部導入板１、下部導入板２、口金板３の順序で積層され本口金装置を構成している。芯成分ポリマーは芯成分導入孔４から供給され煙突部７および芯成分導入連通孔８を流通し、鞘成分ポリマーは鞘成分導入孔５から供給され分配流路６および鞘成分分配用導入孔９を流通し、合流部１１で芯鞘複合化する形態をとる。
【０００９】
ここで重要なのは芯成分ポリマーの計量は芯成分絞り部１０ａにて、鞘成分ポリマーの計量は鞘成分絞り部１０ｂにて行われるため口金の使用による経時的変化を受けず常に精確に計量できる点であり、またパイプを使用していないため、ポリエチレンテレフタレートなどのポリマーを使用した場合、各プレートは洗浄時容易に分解できるため洗浄効率が良い点にある。
【００１０】
本発明において、芯成分導入連通孔８と鞘成分分配用導入孔９の穿設個数の比率が１：３〜１：６である。１：３〜１：４であることが好ましい。芯成分導入連通孔８に対して鞘成分分配用導入孔９の穿設個数の比率が少ない場合、口金板３の厚みを極めて長くとらないと偏芯のない芯鞘複合化をすることが出来ず、一方比率が高すぎると芯鞘複合は偏芯のないものになるが下部導入板に多数の鞘成分分配用導入孔９を穿設せざるを得ず口金装置の製造コストが高くなることと、隣接する吐出孔の間隔を必要以上に広げなければならず、特に一口金から多糸条を紡糸する短繊維の生産においては好ましくない。
【００１１】
また、芯鞘複合繊維の紡糸において芯鞘両成分ポリマーの溶融粘度差が極端に異なる組合せで紡糸を行うことがある。例えば熱接着バインダー用短繊維のように芯成分ポリマーの溶融粘度に比べ鞘成分ポリマーの溶融粘度が極端に低い場合、鞘成分ポリマーの圧力が低いため、芯成分ポリマーが吐出孔１２から吐出されるだけでなく、その一部が鞘成分分配用導入孔９を通じて鞘成分ポリマーが流通する分配流路６へ逆流し芯鞘複合異常を生じさせる懸念がある。従って、芯成分および鞘成分ポリマーの溶融粘度に応じた鞘成分絞り部１０ｂ、吐出孔絞り部１３の孔深度および孔径を設計する必要があり、本発明者らは上記芯鞘複合異常を生じさせないよう孔設計について鋭意検討したところ、下記式(１)より求められる鞘成分ポリマーの圧力Ｐ１および下記式（２）および（３）にて求められる芯成分ポリマーの圧力Ｐ２においてＰ１≧Ｐ２を満たすべくそれぞれの孔深度および孔径を設計すると紡糸操業性を著しく向上できることを見出した。
【００１２】
【数３】

【００１３】
【数４】

【００１４】
このようにＰ１≧Ｐ２となるように鞘成分絞り部１０ｂ、吐出孔絞り部１３の孔径および孔深度を設計することで、紡糸開始時のポリマーの口金面到達への時間差により芯成分ポリマーが鞘成分の分配流路６に流入しても、後からきた鞘成分ポリマーにより逆流した芯成分ポリマーを押し流すことが出来て正常な芯鞘複合化が可能なこと、鞘成分ポリマーの計量性が向上し断面変動率が低下することから著しく操業性が向上する。
【００１５】
本発明の口金装置において、紡出される繊維は特に限定されることはなく、ポリエステル、ポリアミド、ポリフェニレンスルフィドなどの様々なポリマーに使用することができる。
【００１６】
【実施例】
以下実施例により本発明を詳細に説明する。なお、各特性値は以下の方法により求めた。
（１）溶融粘度η
乾燥したチップをSHIMADZU FLOWTESTER CFT-500を用いて下記条件下で溶融粘度の温度依存性を測定し、紡糸パック入りポリマー温度での溶融粘度を圧力計算に用いた。
【００１７】
測定条件
ノズル径：０．５ｍｍ
ノズル長さ：１．０ｍｍ
荷重：２０ｋｇ
尚、チップについては１４０℃×５時間熱風乾燥実施した。但し、融点１４０℃以下のものについては８０℃×１６時間真空下で乾燥した。
（２）断面変動率
ＳＥＡＲＣＨＳＥＩＧＹＯ社製デニロスコープＤＣ−１１を使用し５０本の紡出糸の繊度を測定し、その標準偏差を平均値で除して断面変動率を求めた。
実施例１
図１に示す態様であり、鞘成分絞り部１０ｂの孔深度Ｌ_10bが０．０８ｃｍ、鞘成分絞り部１０ｂの孔径Ｄ_10bが０．０２ｃｍで、孔数が４００Ｈの芯鞘複合繊維紡糸用口金装置を用いて、鞘成分として溶融粘度３２０ｐｏｉｓｅの変性ポリエチレンテレフタレートポリマーを、芯成分として溶融粘度７８０ｐｏｉｓｅの未変性ポリエチレンテレフタレートポリマーを使用し、紡糸温度２８０℃、吐出量３３４ｇ／分、引取速度１３００ｍ／分で芯鞘複合繊維の紡糸を実施した。尚、芯鞘複合重量比率は芯：鞘＝５０：５０であり、芯成分導入連通孔８に対する鞘成分分配用導入孔９の穿設個数の比率ｎが３の口金を用いた。溶融粘度差が大きいポリマーの組合わせにも関わらず単糸切れの発生は皆無であり、安定操業可能であり、断面変動率も良好である。また、口金装置の使用による操業性の悪化はなく、解体性も良好である。
実施例２
鞘成分絞り部１０ｂの孔深度Ｌ_10bが０．０５ｃｍ、鞘成分絞り部１０ｂの孔径Ｄ_10bが０．０２５ｃｍである図１に示す態様の口金を用いた以外は実施例１と同様の方法で芯鞘複合繊維の紡糸を実施した。単糸切れの発生は少なく、安定操業可能であり、断面変動率も低めである。また、口金装置の使用による操業性の悪化はなく、解体性も良好である。
比較例１
図３に示す態様であり、第２分配流路１４で鞘成分ポリマーを再分配した後、鞘成分計量堰１５で計量し芯鞘複合化する口金装置を用いて、実施例１と同一のポリマーおよび紡糸条件にて芯鞘複合繊維の紡糸を実施した。尚、下部導入板２と鞘成分計量堰１５の間隔は０．１ｃｍとした。単糸切れの発生が若干あり、断面変動率がやや高めである。口金装置の解体性は良好であるが、繰返しの使用により単糸切れおよび断面変動率が増加した。
比較例２
図４に示す態様であり、芯成分ポリマーはパイプ１６の内側を流通し、下部導入板にて図５に示す態様の横断面をもち、芯成分ポリマーと鞘成分ポリマが芯鞘成分合流孔１７の下部にて芯鞘複合化する口金装置を用いて、実施例１と同一のポリマーおよび紡糸条件にて芯鞘複合繊維の紡糸を実施した。口金装置の解体は困難であり、また繰返しの使用により単糸切れ、および断面変動率が増加した。
【００１８】
以上の結果を表１に示す。
【００１９】
【表１】

【００２０】
【発明の効果】
本発明によれば、口金の使用による経時的な芯鞘複合斑を抑制し、かつ様々な粘度差をもつ芯鞘複合繊維を安定して紡糸しうる芯鞘複合繊維紡糸用口金装置を提供することができる。
【図面の簡単な説明】
【図１】本発明の芯鞘複合繊維紡糸用口金装置の一例を示す縦断面図である。
【図２】本発明の芯鞘複合繊維紡糸用口金装置の合流部の一例の要部を示す図である。
【図３】従来の口金の一例を示す縦断面図である。
【図４】従来の口金の一例を示す縦断面図である。
【図５】図４の下部導入板２の一例を示す横断面図である。
【符号の説明】
１：上部導入板
２：下部導入板
３：口金板
４：芯成分導入孔
５：鞘成分導入孔
６：分配流路
７：煙突部
８：芯成分導入連通孔
９：鞘成分分配用導入孔
１０ａ：芯成分絞り部
１０ｂ：鞘成分絞り部
１１：合流部
１２：吐出孔
１３：吐出孔絞り部
１４：第２分配流路
１５：鞘成分計量堰
１６：パイプ
１７：芯鞘成分合流孔[0001]
BACKGROUND OF THE INVENTION
The present invention is stable regarding melt spun could the core-in-sheath fiber for melt spinning orifice gold apparatus core-in-sheath composite fibers.
[0002]
[Prior art]
Various types of core-sheath composite fiber spinneret have been proposed in the past. For example, Japanese Patent Application Laid-Open No. 63-190007 and Japanese Patent Application Laid-Open No. 63-256708 have perforated distribution holes corresponding to the spin holes of the base plate. There has been proposed a cap apparatus for obtaining a homogeneous core-sheath composite fiber in which a pipe through which a core component polymer flows is inserted into a distribution plate, and the shape of the distribution plate is defined to reduce the number of core-sheath composite spots. However, since the pipe device is inserted into the distribution plate, there are various problems associated with the dispersion plate and the base plate that cannot be separately disassembled and cleaned in the cleaning of the spinneret after spinning. is there. For example, in a cleaning method (hereinafter referred to as salt cleaning) in which a salt of sodium nitrate-sodium nitrite is heated to 420 ° C. or higher and melted, the organic polymer is decomposed at a high temperature. There is a problem that an impact is generated and bending or tearing occurs in a pipe portion having weak mechanical strength due to repeated salt cleaning. If a pipe with a damaged pipe part is used, eccentricity and increase in the cross-sectional variation rate will occur in the core-sheath composite. Especially when two types of polymers with large melt viscosity differences are spun, directly under the base by the eccentric core-sheath composite. There was a problem that the yarn was bent at the end, eventually leading to yarn breakage, and the operability deteriorated. In addition, in the case of polyester polymers, there is a method of gradually dissolving and washing the polymer in a boiling solution of triethylene glycol solution so as not to apply impact to the pipe. There is a problem that the polymer cannot be thoroughly washed to the details of the plate.
[0003]
On the other hand, in Japanese Patent Application Laid-Open No. 7-216630, a core sheath with less core-sheath composite spots is provided with a pressure loss effect by an annular protrusion provided on the base plate for the sheath component polymer when the core component polymer is coated with the sheath component polymer. Proposal of a base device for obtaining a composite fiber has been made. In this base device, the base can be disassembled and washed after spinning, but the sheath component polymer has a pressure loss caused by a small gap between the annular protrusion provided on the sheath component polymer base plate and the core component polymer base plate. Therefore, the base plate is distorted over time due to use under high temperature conditions during spinning and cleaning, and circumferential spots occur in the gaps, resulting in eccentricity of the core-sheath composite. There's a problem.
[0004]
[Problems to be solved by the invention]
An object of the present invention suppresses temporal sheath composite plaque through the use of the base in the core-in-sheath fiber for melt spinning openings gold, stably melted composite core component polymer and a sheath component polymer having various viscosity difference and to provide a spun can the core-in-sheath fiber for melt spinning openings gold apparatus.
[0005]
[Means for Solving the Problems]
The present invention has the following configuration in order to solve the above problems.
That is, the upper introducing plate, the lower introducing plate, the core-sheath composite fibers for melt spinning openings gold device formed by laminating in the order of the base plate,
1. Distributing flow path and chimney having a core component introducing hole for supplying a core component polymer to an upper introducing plate and a sheath component introducing hole for supplying a sheath component polymer, and capable of distributing the sheath component polymer below the upper introducing plate A portion on the upper introduction plate,
2. The upper introduction plate drilled with the core component introduction port and the chimney and the communication core component introduced passage through the lower introduction plate is provided, 3 a sheath component dispensing introduction holes around the core component introduction passage 6 holes are provided, and a core component restricting portion is provided below the core component introducing hole, and a sheath component restricting portion is provided below the sheath component distributing introducing hole,
3. The upper part of the base plate has a confluence part for combining the core component introduction communication hole and the sheath component distribution introduction hole with the core / sheath composite, a discharge hole communicating with the confluence part, and a constriction part for the discharge hole. Do Te Ri, and,
4). The hole depth and the hole diameter of the sheath component restricting portion and the discharge hole restricting portion satisfy P1 ≧ P2 in a pressure P1 shown in Equation (1) described later and a pressure P2 shown in Equations (2) and (3) described later. a core-sheath composite fibers for melt spinning openings gold apparatus comprising is designed to be.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the core-sheath composite fiber spinning die apparatus of the present invention will be described in detail with reference to the drawings.
[0007]
FIG. 1 is a longitudinal sectional view showing an example of a core-sheath composite fiber spinning die apparatus of the present invention, and FIG. 2 is a view showing a main part of a merging portion 11 in FIG.
[0008]
In FIG. 1, an upper introduction plate 1, a lower introduction plate 2, and a base plate 3 are stacked in this order to constitute the base device. The core component polymer is supplied from the core component introduction hole 4 and flows through the chimney portion 7 and the core component introduction communication hole 8, and the sheath component polymer is supplied from the sheath component introduction hole 5, and the distribution flow path 6 and the sheath component distribution introduction hole 9. And the core-sheath composite is formed at the junction 11.
[0009]
What is important here is that the measurement of the core component polymer is performed at the core component restricting portion 10a, and the sheath component polymer is measured at the sheath component restricting portion 10b. In addition, since a pipe is not used, when a polymer such as polyethylene terephthalate is used, each plate can be easily disassembled at the time of cleaning, so that the cleaning efficiency is good.
[0010]
In the present invention, the ratio of the drilled number of core component introduction passage 8 and sheath component dispensing introduction hole 9 is 1: 3 to 1: Ru 6 der. 1: 3 to 1: it is good preferable is 4. If the ratio of the number of sheath component distribution introduction holes 9 to the core component introduction communication hole 8 is small, the core-sheath composite without eccentricity can be made unless the thickness of the base plate 3 is made extremely long. On the other hand, if the ratio is too high, the core-sheath composite is not eccentric, but a large number of introduction holes 9 for distributing the sheath component must be formed in the lower introduction plate, which increases the manufacturing cost of the base device. In addition, the interval between adjacent discharge holes must be increased more than necessary, and this is not particularly preferable in the production of short fibers for spinning a multifilament from a single die.
[0011]
Further, in the spinning of the core-sheath composite fiber, the core-sheath component polymer may be spun in a combination in which the difference in melt viscosity is extremely different. For example, when the melt viscosity of the sheath component polymer is extremely lower than the melt viscosity of the core component polymer as in the case of the short fiber for the heat-bonding binder, the core component polymer is discharged from the discharge hole 12 because the pressure of the sheath component polymer is low. In addition, there is a concern that a part thereof flows back to the distribution channel 6 through which the sheath component polymer flows through the sheath component distribution introduction hole 9 to cause a core / sheath complex abnormality. Accordingly, it is necessary to design the hole depth and the hole diameter of the sheath component restricting portion 10b and the discharge hole restricting portion 13 according to the melt viscosity of the core component and the sheath component polymer, and the present inventors do not cause the core-sheath complex abnormality. As a result of diligent study on the pore design, the pressure P1 of the sheath component polymer obtained from the following formula (1) and the pressure P2 of the core component polymer obtained from the following formulas (2) and (3) should satisfy P1 ≧ P2. It has been found that the spinning operability can be remarkably improved by designing each hole depth and hole diameter.
[0012]
[Equation 3]

[0013]
[Expression 4]

[0014]
Sheath component aperture portion 10b so that the good urchin P1 ≧ P2, the discharge aperture stop unit 13 to design a pore size and pore depth, the core component polymer sheath by the time difference between the spinneret surface reaches the polymer at the start of spinning Even if it flows into the distribution channel 6 of the component, the core component polymer that has flowed back by the sheath component polymer that came later can be swept away, and normal core-sheath complexing is possible, and the meterability of the sheath component polymer is improved. The operability is remarkably improved because the cross-sectional variation rate is reduced.
[0015]
In the base device of the present invention, the fiber to be spun is not particularly limited, and can be used for various polymers such as polyester, polyamide, polyphenylene sulfide and the like.
[0016]
【Example】
Hereinafter, the present invention will be described in detail by way of examples. Each characteristic value was obtained by the following method.
(1) Melt viscosity η
The temperature dependence of the melt viscosity was measured for the dried chips using SHIMADZU FLOWTESTER CFT-500 under the following conditions, and the melt viscosity at the polymer temperature in the spin pack was used for pressure calculation.
[0017]
Measurement conditions <br/> Nozzle diameter: 0.5 mm
Nozzle length: 1.0mm
Load: 20kg
The chip was dried with hot air at 140 ° C. for 5 hours. However, those having a melting point of 140 ° C. or lower were dried under vacuum at 80 ° C. for 16 hours.
(2) Cross-sectional variation rate The fineness of 50 spun yarns was measured using the deniloscope DC-11 manufactured by SEARCH SEIGYO, and the cross-sectional variation rate was determined by dividing the standard deviation by the average value.
Example 1
A mode shown in FIG. 1, the hole depth L _10b of the sheath component throttle portion 10b is 0.08 cm, hole diameter D _10b of the sheath component aperture portion 10b at 0.02 cm, die for core-sheath composite fiber spinning numbers holes 400H Using a device, a modified polyethylene terephthalate polymer having a melt viscosity of 320 poise is used as a sheath component, an unmodified polyethylene terephthalate polymer having a melt viscosity of 780 poise is used as a core component, a spinning temperature of 280 ° C., a discharge rate of 334 g / min, and a take-up speed of 1300 m / min. Then, the core-sheath composite fiber was spun. The core-sheath composite weight ratio was: core: sheath = 50: 50, and a base having a ratio n of the number of sheath component distribution introduction holes 9 to the core component introduction communication holes 8 of 3 was used. Despite the combination of polymers having a large difference in melt viscosity, no single yarn breakage occurs, stable operation is possible, and the cross-sectional variation rate is also good. Moreover, there is no deterioration in operability due to the use of the base device, and the dismantling property is also good.
Example 2
The same method as in Example 1 except that the base of the embodiment shown in FIG. 1 in which the hole depth L _10b of the sheath component restricting portion _10b is 0.05 cm and the hole diameter D _10b of the sheath component restricting portion _10b is 0.025 cm is used. The core-sheath composite fiber was spun. The occurrence of single yarn breakage is small, stable operation is possible, and the cross-sectional variation rate is low. Moreover, there is no deterioration in operability due to the use of the base device, and the dismantling property is also good.
Comparative Example 1
3 is the same polymer as in Example 1, using a base device that redistributes the sheath component polymer in the second distribution flow path 14 and then measures it in the sheath component measuring weir 15 to form a core-sheath composite. The core-sheath composite fiber was spun under the spinning conditions. In addition, the space | interval of the lower introduction board 2 and the sheath component measurement weir 15 was 0.1 cm. Single yarn breakage occurs slightly, and the cross-sectional variation rate is slightly high. Although the dismantling property of the base device is good, the single yarn breakage and the cross-sectional variation rate increased by repeated use.
Comparative Example 2
4, the core component polymer flows inside the pipe 16, and has a cross-section of the embodiment shown in FIG. 5 at the lower introduction plate. The core component polymer and the sheath component polymer are the core-sheath component joining holes 17. The core-sheath composite fiber was spun under the same polymer and spinning conditions as in Example 1 using a base device for core-sheath compounding at the lower part of the core. The disassembly of the base device is difficult, and the single yarn breakage and the cross-sectional variation rate increased due to repeated use.
[0018]
The results are shown in Table 1.
[0019]
[Table 1]

[0020]
【The invention's effect】
ADVANTAGE OF THE INVENTION According to this invention, the core-sheath compound fiber spinning nozzle | cap | die apparatus which suppresses the core-sheath complex spot with time by use of a nozzle | cap | die, and can spin stably the core-sheath complex fiber which has various viscosity differences is provided. be able to.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view showing an example of a core-sheath composite fiber spinning die unit of the present invention.
FIG. 2 is a view showing a main part of an example of a merging portion of a core-sheath composite fiber spinning die unit of the present invention.
FIG. 3 is a longitudinal sectional view showing an example of a conventional base.
FIG. 4 is a longitudinal sectional view showing an example of a conventional base.
5 is a cross-sectional view showing an example of the lower introduction plate 2 of FIG.
[Explanation of symbols]
1: Upper introduction plate 2: Lower introduction plate 3: Base plate 4: Core component introduction hole 5: Sheath component introduction hole 6: Distribution channel 7: Chimney 8: Core component introduction communication hole 9: Introduction hole for sheath component distribution 10a: core component restricting portion 10b: sheath component restricting portion 11: merging portion 12: discharge hole 13: discharge hole restricting portion 14: second distribution flow path 15: sheath component measuring weir 16: pipe 17: core sheath component confluence

Claims

Upper introducing plate, the lower introducing plate, the core-sheath composite fibers for melt spinning openings gold device formed by laminating in the order of the base plate,
1. Distributing flow path and chimney having a core component introducing hole for supplying a core component polymer to an upper introducing plate and a sheath component introducing hole for supplying a sheath component polymer, and capable of distributing the sheath component polymer below the upper introducing plate A portion on the upper introduction plate,
2. The upper introduction plate drilled with the core component introduction port and the chimney and the communication core component introduced passage through the lower introduction plate is provided, 3 a sheath component dispensing introduction holes around the core component introduction passage 6 puncture was set, the core component throttle portion in the lower portion of the core component introduction hole, it is provided a sheath component throttle portion at the bottom of the sheath component dispensing introducing hole,
3. The upper part of the base plate has a confluence part for combining the core component introduction communication hole and the sheath component distribution introduction hole with the core / sheath composite, a discharge hole communicating with the confluence part, and a constriction part for the discharge hole. It becomes Te, and,
4). Designed so that the hole depth and the hole diameter of the sheath component throttle part and the discharge hole throttle part satisfy P1 ≧ P2 at the pressure P1 shown in the following formula (1) and the pressure P2 shown in the following formulas (2) and (3). It has been made possible the core-in-sheath fiber for melt spinning openings gold apparatus according to claim.