JP7057605B2 - 耐摩耗性に優れた熱成形紐及び熱成形網地の製造方法 - Google Patents
耐摩耗性に優れた熱成形紐及び熱成形網地の製造方法 Download PDFInfo
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- D01D5/28—Formation of filaments, threads, or the like while mixing different spinning solutions or melts during the spinning operation; Spinnerette packs therefor
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Description
[マルチフィラメント糸の準備]
鞘成分として、融点160℃の共重合ポリエステルを準備した。この共重合ポリエステルは、共重合単位のモル比として、テレフタル酸86.8モル、エチレングリコール36.8モル、1,4-ブタンジオール49.2モル、ε-カプロラクトン13.2モル及びジエチレングリコール0.8モルよりなるものである。一方、芯成分として、融点225℃のポリアミド6を準備した。孔径0.6mmで孔数192個の芯鞘型複合紡糸口金を具えた複合溶融紡糸装置に、上記した共重合ポリエステルとポリアミド6を供給し、口金温度を270℃とし、共重合ポリエステル:ポリアミド6=1:2.7(質量比)として、複合溶融紡糸を行った。得られた芯鞘型複合長繊維192本が集束した糸条に、常用の手段で冷却、延伸及び弛緩処理を施し、1670デシテックス/192フィラメントのマルチフィラメント糸を得た。
得られたマルチフィラメント糸を2本引き揃えた糸条を製紐用ボビンに巻き取った後、8打角製紐機に導入し8本組紐を得た。この8本組紐を、温度180℃及び時間1分の条件で、組紐中の芯鞘型複合長繊維の鞘成分を融着させ、全体が一体化された熱成形紐を得た。
共重合ポリエステル:ポリアミド6=1:1.5(質量比)に変更した他は、実施例1と同一の方法により、熱成形紐を得た。
実施例1で得られたマルチフィラメント糸16本を引き揃えた糸条を得た。この糸条4本を組紐網機に掛けて組み、網脚と無結節を持つ無結節網地を得た。この無結節網地を、ピンテンター型熱処理装置に導入し、幅方向に張力を掛けながら、180℃の雰囲気下で3分間熱処理した。その後、室温中に放置して冷却することにより、熱成形網を得た。この熱成形網は、網脚及び無結節のいずれの部位においても、鞘成分が溶融し芯鞘型複合長繊維相互間が融着されたものであった。また、網脚の径が約4mmで無結節の面積は約40mm2であり、目は角目であって面積は約6cm2であり、これを用いて筒状直方体の養殖網を得た。
鞘成分として、融点123℃でメルトフローレート59.8g/10分(温度280℃、荷重2.16kgfの条件下でのメルトフローレート値)のポリエチレン(日本ポリエチレン株式会社製、品番UJ580)を用いる他は、実施例1と同一の方法で1670デシテックス/192フィラメントのマルチフィラメント糸を得た。このマルチフィラメント糸を用い、温度を150℃とした他は実施例1と同一の方法で熱成形紐を得た。
芯成分として、ポリアミド6に代えて、ポリエチレンテレフタレート(融点256℃、極限粘度[η]0.75)を用いる他は、実施例1と同一の方法により、8本組紐を得た。そして、この8本組紐を、温度180℃及び時間1分の条件で、組紐中の芯鞘型複合長繊維の鞘成分を融着させ、全体が一体化された熱成形紐を得た。なお、極限粘度[η]は、フェノールと四塩化エタンの等重量混合物を溶媒とし、濃度0.5g/dl及び液温20℃で測定ししたものである。
実施例1、2、比較例1及び2で得られた熱成形紐を試料として、以下の方法で屈曲疲労性の試験を行った。
まず、JIS L-1013(2000)8.5.1引張強さの標準時試験に準拠して、屈曲処理前の各試料の引張強さ(N)を、株式会社島津製作所製オートグラフAG-1を用い、つかみ間隔250mmで引張速度300mm/分で測定した。この試料を、株式会社マイズ試験機製のMIT耐折度試験機に掛けて、各試料に角度±120°で試験速度175回/分で屈曲処理を行った。屈曲処理の回数は、500回、2000回及び5000回行った。屈曲処理後の各試料につき、前述と同一の方法により引張強さ(N)を測定し、その結果を表1に示した。そして、以下の式により、強力保持率(%)を算出し、表2に示した。強力保持率(%)=[屈曲処理後の試料の引張強さ(N)]/[屈曲処理前の試料の引張強さ(N)]×100。
━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
屈曲処理前 500回処理後 2000回処理後 5000回処理後
━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
実施例1 543 542 551 520
実施例2 452 476 463 432
比較例1 459 459 421 414
比較例2 482 421 307 225
━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
屈曲処理前 500回処理後 2000回処理後 5000回処理後
━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
実施例1 100 99.8 101.5 95.8
実施例2 100 105.5 102.5 95.6
比較例1 100 100 91.8 90.2
比較例2 100 87.4 63.6 46.7
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実施例1、2及び比較例2で得られた8本組紐及び熱成形紐を試料として、以下の二つの方法でアルカリ性に対する耐久試験を行った。
(1)強力保持率(%)の試験
水酸化ナトリウム(99% マルゼン社製)を用いて3Nの水酸化ナトリウム水溶液を準備した。次いで、試料(8本組紐及び熱成形紐)を、試料の重量に対して10倍以上の重量の水酸化ナトリウム水溶液中に浸漬させ、960時間放置した。その後、試料を水酸化ナトリウム水溶液中から引き上げて、純水中で10秒間×2回すすいだ後、流水で1分間洗った。次いで、2日間風乾して試料に含まれている水分を除去した乾燥試料を、前記した屈曲疲労性の試験の場合と同一の条件で引張強さ(N1)を測定した。そして、水酸化ナトリウム水溶液に浸漬する前の8本組紐及び熱成形紐の引張強さ(N0)も、同一の条件で測定し、強力保持率(%)=(N1/N0)×100を算出した。
(2)減量率(%)の試験
水酸化ナトリウム水溶液に浸漬する前の試料(8本組紐及び熱成形紐)を、50℃の乾燥機中に24時間入れた後、乾燥剤の入ったデシケーター中に1時間以上入れた。その後、常温で重量(W0)を測定した。一方、上記(1)の乾燥試料を、50℃の乾燥機中に24時間入れた後、乾燥剤の入ったデシケーター中に1時間以上入れた。その後、常温で重量(W1)を測定した。そして、減量率(%)=[(W0-W1)/W0]×100を算出した。
上記(1)の強力保持率(%)の試験結果及び上記(2)の減量率(%)の試験結果を表3に示した。
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N0 N1 強力保持率(%) 減量率(%)
━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
実施例1(8本組紐)564 500 88.7 26.8
実施例1(熱成形紐)533 453 85.0 26.8
実施例2(8本組紐)513 423 82.5 39.9
実施例2(熱成形紐)477 413 86.4 36.9
比較例2(8本組紐)475 174 36.6 70.0
比較例2(熱成形紐)480 403 83.9 6.0
━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
3Nの水酸化ナトリウム水溶液に代えて、硫酸(98% 特級 関東化学株式会社製)を用いて5Nの酸性水溶液とした他は、[アルカリ性に対する耐久試験]と同一の方法で、強力保持率(%)及び減量率(%)の試験を行った。この結果を表4に示した。
[表4]
━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
N0 N1 強力保持率(%) 減量率(%)
━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
実施例1(8本組紐)564 133 23.6 1.7
実施例1(熱成形紐)533 156 29.2 -5.3
実施例2(8本組紐)513 232 45.3 7.8
実施例2(熱成形紐)477 368 77.2 -0.1
比較例2(8本組紐)475 471 99.3 0.2
比較例2(熱成形紐)480 474 98.6 0.0
━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
Claims (5)
- テレフタル酸、エチレングリコール及び1,4-ブタンジオールを共重合単位として含む共重合ポリエステルを鞘成分とし、ポリアミド6を芯成分として、複合溶融紡糸法により、該芯成分と該鞘成分の質量比が芯成分:鞘成分=1~4:1である芯鞘型複合長繊維が集束されてなるマルチフィラメント糸を得る工程、
前記マルチフィラメント糸の複数本を組んで組紐を得る工程及び
前記組紐を加熱し、前記共重合ポリエステルを溶融させると共に、前記ポリアミド6は当初の繊維形態を維持した状態で、前記芯鞘型複合長繊維相互間を融着せしめる工程を具備することを特徴とする耐摩耗性に優れた熱成形紐の製造方法。 - 共重合単位して、さらに、ε-カプロラクトン及び/又はジエチレングリコールを含む請求項1記載の耐摩耗性に優れた熱成形紐の製造方法。
- 複数本のマルチフィラメン糸を引き揃えてなる糸条を組んで組紐を得る請求項1記載の耐摩耗性に優れた熱成形紐の製造方法。
- テレフタル酸、エチレングリコール及び1,4-ブタンジオールを共重合単位として含む共重合ポリエステルを鞘成分とし、ポリアミド6を芯成分として、複合溶融紡糸法により、該芯成分と該鞘成分の質量比が芯成分:鞘成分=1~4:1である芯鞘型複合長繊維が集束されてなるマルチフィラメント糸を得る工程、
前記マルチフィラメント糸の複数本を組んで、網脚が組紐となる無結節網地を得る工程及び
前記無結節網地を加熱し、前記共重合ポリエステルを溶融させると共に、前記ポリアミド6は当初の繊維形態を維持した状態で、前記芯鞘型複合長繊維相互間を融着せしめる工程を具備することを特徴とする耐摩耗性に優れた熱成形網地の製造方法。 - 請求項4記載の方法で得られた熱成形網地を所定形状に成型する漁網の製造方法。
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