JP3689956B2 - Base for melt spinning - Google Patents
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- JP3689956B2 JP3689956B2 JP00461396A JP461396A JP3689956B2 JP 3689956 B2 JP3689956 B2 JP 3689956B2 JP 00461396 A JP00461396 A JP 00461396A JP 461396 A JP461396 A JP 461396A JP 3689956 B2 JP3689956 B2 JP 3689956B2
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Description
【０００１】
【発明の属する技術分野】
本発明は熱可塑性樹脂を溶融紡糸する際に使用する溶融紡糸用口金に関するものである。
【０００２】
【従来の技術】
熱可塑性樹脂を用いて溶融紡糸する口金として、従来、図３の様な整流板下に紡糸孔を持つ口金が用いられている。また、異繊度混繊糸製造用口金として、特開昭58-174612 号公報には、図４の様に口金板(12)と整流板(13)との間に口金板(12)の上面に接して、紡糸孔(14)と連通する溶融液流通孔を穿設した前板(15)を設置した溶融紡糸用口金が提案されている。この溶融紡糸用口金は、前板からの流出部(16)の孔径が口金板への流入部(17)に比べ極めて小さい。このため、高粘度の熱可塑性樹脂を溶融紡糸する場合、熱可塑性樹脂は口金板流入部の上端部(18)で異常滞留を起こし、長時間に渡る熱履歴により熱劣化し、紡糸性および延伸性が悪化するという問題があった。
【０００３】
【発明が解決しようとする課題】
本発明は、上述した口金板流入部での異常滞留、熱可塑性樹脂の熱劣化による紡糸性および延伸性の悪化を解決し、高粘度の熱可塑性樹脂を効率よく溶融紡糸することができる溶融紡糸用口金を提供することを課題とするものである。
【０００４】
【課題を解決するための手段】
本発明者らは、上記課題を解決するために鋭意検討した結果、吐出孔を穿設した口金板の上面に接する前板の溶融液流通孔の形状を変更することによって、口金板流入部での異常滞留の発生を解消し効率よく溶融紡糸することができることを見いだし、本発明に到達した。
【０００５】
本発明の要旨は次の通りである。
(１)熱可塑性樹脂の溶融紡糸に用いる口金であって、吐出孔を穿設した口金板と、該口金板の上面に接して、吐出孔と連通する溶融液流通孔を穿設した前板から成り、該前板における溶融液流通孔に絞り部を設け、該絞り部の第一下流テーパー角θ １ と第二下流テーパー角θ ２ が次式を満足することを特徴とする溶融紡糸用口金。
θ １ ＝２０゜〜９０゜
θ２＝６０゜〜１５０゜
θ１＜θ２
(２)絞り部の最小孔径部の長さ（Ｌｍｍ）とその直径（Ｄｍｍ）との比が下記の数値を満足することを特徴とする前項(１) 記載の溶融紡糸用口金。
Ｌ／Ｄ＝０．３〜３．０
(３)紡糸時の溶融粘度が３０００〜１００００ポイズである熱可塑性樹脂を溶融紡糸することを特徴とする前項(１)または ( ２ )記載の溶融紡糸用口金。
【０００６】
【発明の実施の形態】
図１は、本発明の溶融紡糸用口金の全体図で、図２は本発明の溶融紡糸用口金の詳細な部分拡大図である。本発明の溶融紡糸用口金について図１および図２を用いて説明する。本発明の溶融紡糸用口金は吐出孔(5) を穿設した口金板(4) と口金板(4) の上面に接して、吐出孔(5) と連通する溶融液流通孔(6) を穿設した前板(3) から成り、該前板(3) における溶融液流通孔(6) に絞り部(7) を設けてあり、前板流出部(8) と口金板流入部(9) の孔径差を小さくしている。本発明の溶融紡糸用口金における絞り部(7) とは、絞り部(7) の断面積(S) が溶融液流入部および溶融液流出部の断面積(S1 ,S2 ) より小さくなっている部分を指す。かかる口金において、溶融液は前板(3) の溶融液流通孔(6) を通り、絞り部(7) で整流され口金板(4) へ流入するが、前板流出部(8) と口金板流入部(9) の孔径差が小さいため、従来例に見られたような口金板流入部で異常滞留を起こすことなく口金板へ流入する。
【０００７】
次に、絞り部(７)において整流された溶融液が異常滞留を起こさずに口金板(４)に流入するために、絞り部下のテーパーは二段階とし、第一下流テーパー角θ１と第二下流テーパー角θ２は下記式の範囲を満足する。
θ１＝２０゜〜９０゜
θ２＝６０゜〜１５０゜
θ１＜θ２
θ１が２０゜未満であると、溶融液が第二下流テーパー部で異常滞留を起こし、９０゜を超えると、溶融液が第一下流テーパー部で異常滞留を起こす。また、θ２が６０゜未満であると、溶融液が口金板流入部で異常滞留を起こし、１５０゜を超えると、口金板流入部の孔径が大きくなるため、紡糸孔数が制限されたり、前板(３)が厚くなるため、口金ホルダーへの挿入が困難になる。
【０００８】
さらに、θ1 、θ2 は上記の問題から、好ましくはθ1 ＝３０゜〜７０゜，θ2 ＝７０゜〜１２０゜、さらに好ましくはθ1 ＝４０゜〜６０゜，θ2 ＝８０゜〜１００゜である。また、絞り部下のテーパーは二段階と限定する必要はなく、二段階以上でも何らさしつかえはない。二段階以上のテーパーを設けた場合、θ2 は最終テーパーのテーパー角となる。
【０００９】
絞り部の最小孔径部の長さ（Ｌmm）とその直径（Ｄmm）との比は、下記式の範囲を満足することが好ましい。
Ｌ／Ｄ＝０．３〜３．０
Ｌ／Ｄが上記式の範囲を満足すると、溶融液への整流効果があり、適切な背面圧を与えることが出来る。
【００１０】
本発明の溶融紡糸用口金は熱可塑性樹脂の溶融紡糸に用いる口金であるが、異常滞留を起こしやすい２９０℃における溶融粘度が3000〜10000 ポイズである熱可塑性樹脂の溶融紡糸には、より有用である。本発明において、熱可塑性樹脂とは、ポリエステル、ポリアミド、ポリオレフィンなどの溶融紡糸可能な重合体をいう。これらの熱可塑性樹脂は少量の添加剤、例えば艶消し剤、着色剤、安定剤、制電剤などを含有していても何ら差し支えない。
【００１１】
また、口金板に穿孔する紡糸孔の形状は、特に限定されるものではなく、丸断面、３葉、６葉等の異形断面のいずれでも何らさしつかえない。
【００１２】
【実施例】
以下に、実施例により本発明を具体的に説明する。尚、実施例における各特性値は次の方法により求めた。
【００１３】
（Ａ）溶融粘度
島津製作所製高化式フローテスターを用いて、２９０℃で測定した。
【００１４】
（Ｂ）紡糸糸切れ回数
紡糸糸切れ回数は、６kg巻きの未延伸糸パッケージ５０００個を得るまでに発生した紡糸時の糸切れの回数とした。◎、○が本発明の目標レベルである。
尚、紡糸性の判定は以下の通りとした。
紡糸糸切れ回数 紡糸性の判定
０〜１０回 ◎
１１〜２０回 ○
２１〜３０回 △
３１回以上 ×
【００１５】
（Ｃ）延伸糸切れ回数
延伸糸切れ回数は、２kg巻きの延伸糸パッケージ３０００個を得るまでに発生した延伸時の糸切れの回数とした。◎、○が本発明の目標レベルである。
尚、延伸性の判定は以下の通りとした。
引伸糸切れ回数 引伸性の判定
０〜１０回 ◎
１１〜２０回 ○
２１〜３０回 △
３１回以上 ×
【００１６】
実施例１
図１の溶融紡糸用口金を用いて、２９０℃での溶融粘度が5000ポイズであるポリエチレンテレフタレートを溶融紡糸した。得られた未延伸糸は、延伸糸の伸度が３５％程度となる延伸倍率で常法により延伸した。紡糸条件および延伸条件は下記の通りとした。
紡糸条件
紡糸温度：２９５℃
紡糸口金の孔数：３６
紡糸口金の孔径：０．２３ｍｍ
吐出量：３６．０ｇ／分
紡糸速度：１５００ｍ／分
第一下流テーパー角θ1 ：４０゜
第二下流テーパー角θ2 ：９０゜
絞り部の最小孔径部の長さ（Ｌmm）と直径（Ｄmm）との比（Ｌ／Ｄ）：１．０
延伸条件
ホットローラー温度：８６℃
熱板温度：１４０℃
延伸速度：７５０ｍ／分
紡糸および延伸における糸切れ回数は４回、５回であり、紡糸性および延伸性は非常に良好であった。
【００１７】
比較例１
図４の溶融紡糸用口金を用いて、実施例１と同様な条件で紡糸および延伸を行った。この場合、紡糸および延伸において糸切れ回数が３５回、３７回と多発し、紡糸性および延伸性が非常に不良であった。また、紡糸終了後の口金板流入部（図４(18)部）に異常滞留による黒色化した劣化ポリマが確認された。
【００１８】
実施例２、比較例２
図１の溶融紡糸用口金を用いて、第一下流テーパー角θ１、第二下流テーパー角θ２、絞り部の最小孔径部の長さ（Ｌｍｍ）と直径（Ｄｍｍ）との比および、２９０℃での溶融粘度を表１の様に種々変更した以外は、実施例１と同様な条件で紡糸および延伸を行った。このときの紡糸性および延伸性を併せて表１に示す。
【００１９】
表１から明らかなように、本発明の範囲であるＮｏ．１〜６の水準では紡糸性、延伸性が非常に良好なレベルであった。本発明の範囲外であるＮｏ．７〜９の水準では紡糸性、延伸性がやや不良なレベルであった。
【００２０】
【表１】
【発明の効果】
本発明によれば、口金板流入部での異常滞留、熱可塑性樹脂の熱劣化による紡糸性および延伸性の悪化を解消することができるので、高粘度の熱可塑性樹脂を効率良く溶融紡糸することが可能となる。
【図面の簡単な説明】
【図１】本発明の溶融紡糸用口金の全体模式図である。
【図２】本発明の溶融紡糸用口金の詳細な部分拡大図である。
【図３】従来の溶融紡糸用口金の部分拡大図である。
【図４】従来の溶融紡糸用口金の部分拡大図である。
【符号の説明】
１・・口金ホルダー
２・・整流板
３・・前板
４・・口金板
５・・吐出孔
６・・溶融液流通孔
７・・絞り部
８・・前板流出部
９・・口金板流入部
θ1 ・第一下流テーパー角
θ2 ・第二下流テーパー角
Ｌ・・絞り部の最小孔径部の長さ
Ｄ・・絞り部の最小孔径部の直径
Ｓ・・絞り部の最小孔径部の断面積
Ｓ1 ・溶融液流入部の断面積
Ｓ2 ・溶融液流出部の断面積
１１・・口金ホルダー
１２・・口金板
１３・・整流板
１４・・紡糸孔
１５・・前板
１６・・前板からの流出部
１７・・口金板への流入部
１８・・口金板流入部の上端部[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a melt spinning die used for melt spinning a thermoplastic resin.
[0002]
[Prior art]
Conventionally, a die having a spinning hole under a current plate as shown in FIG. 3 is used as a die for melt spinning using a thermoplastic resin. In addition, as a die for producing different fineness mixed yarn, Japanese Patent Application Laid-Open No. 58-174612 discloses that the upper surface of the die plate (12) is between the die plate (12) and the rectifying plate (13) as shown in FIG. There has been proposed a melt spinning die having a front plate (15) provided with a melt flow hole communicating with the spinning hole (14). In the melt spinning die, the diameter of the outflow portion (16) from the front plate is extremely smaller than that of the inflow portion (17) into the die plate. For this reason, when melt spinning high-viscosity thermoplastic resin, the thermoplastic resin abnormally stays at the upper end portion (18) of the inflow portion of the base plate, and is thermally deteriorated due to heat history over a long period of time. There was a problem that the sex deteriorated.
[0003]
[Problems to be solved by the invention]
The present invention solves the above-described abnormal stagnation at the inflow portion of the base plate and the deterioration of spinnability and stretchability due to thermal deterioration of the thermoplastic resin, and can efficiently melt-spin high-viscosity thermoplastic resin. It is an object to provide a service base.
[0004]
[Means for Solving the Problems]
As a result of intensive studies to solve the above-mentioned problems, the inventors have changed the shape of the melt flow hole in the front plate in contact with the upper surface of the die plate in which the discharge holes are formed, so that The present inventors have found that it is possible to eliminate the occurrence of abnormal stagnation and efficiently perform melt spinning, and have reached the present invention.
[0005]
The gist of the present invention is as follows.
(1) A base plate used for melt spinning of a thermoplastic resin, a base plate provided with discharge holes, and a front plate provided with a melt flow hole which is in contact with the upper surface of the base plate and communicates with the discharge holes For the melt spinning, characterized in that a constriction is provided in the melt flow hole in the front plate , and the first downstream taper angle θ 1 and the second downstream taper angle θ 2 of the constriction satisfy the following formula: Base .
θ 1 = 20 ° to 90 ° θ 2 = 60 ° to 150 ° θ 1 <θ 2
(2) the length of the minimum pore diameter of the throttle portion (L mm) and the diameter (Dmm) ratio of is characterized by satisfying the numerical values below the above (1) Symbol placement melt spinning die of.
L / D = 0.3-3.0
( 3 ) The melt spinning die according to (1) or ( 2 ) , wherein a thermoplastic resin having a melt viscosity at the time of spinning of 3000 to 10,000 poise is melt-spun.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 is an overall view of the melt spinning die of the present invention, and FIG. 2 is a detailed partial enlarged view of the melt spinning die of the present invention. The melt spinning die of the present invention will be described with reference to FIGS. The melt spinning base of the present invention has a base plate (4) provided with a discharge hole (5) and an upper surface of the base plate (4) with a melt flow hole (6) communicating with the discharge hole (5). The front plate (3) is formed with a throttling portion (7) in the melt flow hole (6) in the front plate (3), and the front plate outflow portion (8) and the base plate inflow portion (9 ) Is reduced. In the melt spinning die of the present invention, the narrowed portion (7) means that the cross sectional area (S) of the narrowed portion (7) is smaller than the cross sectional areas (S 1 , S 2 ) of the melt inflow portion and the melt outflow portion. Refers to the part. In such a base, the melt passes through the melt flow hole (6) of the front plate (3), is rectified by the throttle (7) and flows into the base plate (4). Since the hole diameter difference of the plate inflow portion (9) is small, it flows into the base plate without causing abnormal retention at the base plate inflow portion as seen in the prior art.
[0007]
Next, in order for the melt rectified in the throttle part (7) to flow into the base plate (4) without causing abnormal stagnation, the taper below the throttle part has two stages, the first downstream taper angle θ 1 and the first taper angle second downstream taper angle θ 2 is you satisfy the range of the following formula.
θ 1 = 20 ° to 90 ° θ 2 = 60 ° to 150 ° θ 1 <θ 2
When θ 1 is less than 20 °, the molten liquid abnormally stays at the second downstream tapered portion, and when it exceeds 90 °, the molten liquid abnormally stays at the first downstream tapered portion. Also, if θ 2 is less than 60 °, the melt will stay abnormally in the inflow portion of the base plate, and if it exceeds 150 °, the diameter of the inflow portion of the base plate increases, so the number of spinning holes is limited, Since the front plate (3) is thick, it is difficult to insert it into the base holder.
[0008]
Further, θ 1 and θ 2 are preferably θ 1 = 30 ° to 70 °, θ 2 = 70 ° to 120 °, more preferably θ 1 = 40 ° to 60 °, θ 2 = 80 ° from the above problems. ~ 100 °. Further, the taper under the throttle portion need not be limited to two stages, and there is no problem even if there are two or more stages. When two or more levels of taper are provided, θ 2 is the taper angle of the final taper.
[0009]
It is preferable that the ratio of the length (Lmm) of the minimum hole diameter portion of the throttle portion to the diameter (Dmm) satisfies the range of the following formula.
L / D = 0.3-3.0
When L / D satisfies the range of the above formula, there is a rectifying effect on the melt, and an appropriate back pressure can be applied.
[0010]
The base for melt spinning of the present invention is a base used for melt spinning of a thermoplastic resin. However, it is more useful for melt spinning of a thermoplastic resin having a melt viscosity at 290 ° C. of 3000 to 10000 poise, which is likely to cause abnormal retention. is there. In the present invention, the thermoplastic resin refers to a melt-spinnable polymer such as polyester, polyamide, and polyolefin. These thermoplastic resins may contain a small amount of additives such as matting agents, coloring agents, stabilizers, antistatic agents and the like.
[0011]
In addition, the shape of the spinning hole drilled in the base plate is not particularly limited, and any one of a round cross-section, a three-leaf, a six-leaf, and other irregular cross-sections can be used.
[0012]
【Example】
Hereinafter, the present invention will be described specifically by way of examples. In addition, each characteristic value in an Example was calculated | required with the following method.
[0013]
(A) Melt viscosity The viscosity was measured at 290 ° C. using a high-pressure flow tester manufactured by Shimadzu Corporation.
[0014]
(B) Number of spun yarn breaks The number of spun yarn breaks was defined as the number of yarn breaks during spinning that occurred before obtaining 5000 undrawn yarn packages of 6 kg. A and B are target levels of the present invention.
The spinnability was determined as follows.
Spinning yarn breakage number of times the spinning of the judgment 0 times ◎
11 to 20 times ○
21 to 30 times △
31 times or more ×
[0015]
(C) Number of drawn yarn breaks The number of drawn yarn breaks was defined as the number of yarn breaks during drawing that occurred until 3000 pieces of 2 kg wound drawn yarn packages were obtained. A and B are target levels of the present invention.
The stretchability was determined as follows.
Enlarger yarn breakage number enlarger of the judgment 0 times ◎
11 to 20 times ○
21 to 30 times △
31 times or more ×
[0016]
Example 1
Polyethylene terephthalate having a melt viscosity of 5,000 poise at 290 ° C. was melt-spun using the melt-spinning die shown in FIG. The obtained undrawn yarn was drawn by a conventional method at a draw ratio at which the drawn yarn had an elongation of about 35%. The spinning conditions and stretching conditions were as follows.
Spinning conditions Spinning temperature: 295 ° C
Number of holes in the spinneret: 36
Spinneret hole diameter: 0.23 mm
Discharge amount: 36.0 g / min Spinning speed: 1500 m / min First downstream taper angle θ 1 : 40 ° Second downstream taper angle θ 2 : 90 ° Minimum hole diameter (Lmm) and diameter (Dmm) ) Ratio (L / D): 1.0
Drawing conditions Hot roller temperature: 86 ° C
Hot plate temperature: 140 ° C
Drawing speed: 750 m / min The number of yarn breaks in spinning and drawing was 4 times and 5 times, and the spinnability and drawability were very good.
[0017]
Comparative Example 1
Spinning and drawing were performed under the same conditions as in Example 1 using the melt spinning die shown in FIG. In this case, the number of breaks in spinning and stretching frequently occurred at 35 times and 37 times, and the spinnability and stretchability were very poor. Further, a blackened deteriorated polymer due to abnormal stagnation was confirmed at the base plate inflow portion (FIG. 4 (18) portion) after spinning.
[0018]
Example 2 and Comparative Example 2
1 , the ratio of the first downstream taper angle θ 1 , the second downstream taper angle θ 2 , the length (Lmm) and the diameter (Dmm) of the minimum hole diameter portion of the throttle portion, and 290 Spinning and stretching were performed under the same conditions as in Example 1 except that the melt viscosity at 0 ° C. was variously changed as shown in Table 1. The spinnability and stretchability at this time are shown together in Table 1.
[0019]
As is clear from Table 1, No. which is the scope of the present invention. Spinnability at a level of 1-6, stretchability was very good level. No. which is outside the scope of the present invention. In the level of 7-9, spinnability and stretchability were slightly poor.
[0020]
[Table 1]
【The invention's effect】
According to the present invention, abnormal residence at the inlet of the base plate, and deterioration of spinnability and stretchability due to thermal deterioration of the thermoplastic resin can be eliminated, so that high viscosity thermoplastic resin can be efficiently melt-spun. Is possible.
[Brief description of the drawings]
FIG. 1 is an overall schematic view of a melt spinning die of the present invention.
FIG. 2 is a detailed partially enlarged view of the melt spinning die of the present invention.
FIG. 3 is a partially enlarged view of a conventional melt spinning die.
FIG. 4 is a partially enlarged view of a conventional melt spinning base.
[Explanation of symbols]
1. · Base holder 2 ·· Rectifying plate 3 ·· Front plate 4 ·· Base plate 5 ·· Discharge hole 6 ·
Claims (3)
θ １ ＝２０°〜９０°
θ ２ ＝６０°〜１５０°
θ １ ＜θ ２ A base used for melt spinning of a thermoplastic resin, comprising a base plate provided with a discharge hole, and a front plate provided in contact with the upper surface of the base plate and provided with a melt flow hole communicating with the discharge hole, A base for melt spinning, wherein a throttle part is provided in a melt flow hole in the front plate, and a first downstream taper angle θ 1 and a second downstream taper angle θ 2 of the throttle part satisfy the following formula .
θ 1 = 20 ° to 90 °
θ 2 = 60 ° to 150 °
θ 1 <θ 2
Ｌ／Ｄ＝０．３〜３．０The length of the minimum pore diameter of the throttle portion (L mm) and the melt spinning die of claim 1 Symbol placement ratio of the diameter (Dmm) is characterized by satisfying the numerical values below.
L / D = 0.3-3.0
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP00461396A JP3689956B2 (en) | 1996-01-16 | 1996-01-16 | Base for melt spinning |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP00461396A JP3689956B2 (en) | 1996-01-16 | 1996-01-16 | Base for melt spinning |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH09195119A JPH09195119A (en) | 1997-07-29 |
| JP3689956B2 true JP3689956B2 (en) | 2005-08-31 |
Family
ID=11588915
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP00461396A Expired - Fee Related JP3689956B2 (en) | 1996-01-16 | 1996-01-16 | Base for melt spinning |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3689956B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106012046A (en) * | 2016-06-20 | 2016-10-12 | 昆山鸿福泰环保科技有限公司 | Novel spinneret joint |
-
1996
- 1996-01-16 JP JP00461396A patent/JP3689956B2/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106012046A (en) * | 2016-06-20 | 2016-10-12 | 昆山鸿福泰环保科技有限公司 | Novel spinneret joint |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH09195119A (en) | 1997-07-29 |
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