JP5839310B1 - 引き裂き性を有する熱収縮チューブ - Google Patents
引き裂き性を有する熱収縮チューブ Download PDFInfo
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- A61L29/00—Materials for catheters, medical tubing, cannulae, or endoscopes or for coating catheters
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- C08L27/12—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Compositions of derivatives of such polymers not modified by chemical after-treatment containing fluorine atoms
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
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- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L11/00—Hoses, i.e. flexible pipes
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- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
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Abstract
Description
しかし、用途によって、必要とされるチューブ径が細くなると、チューブを引き裂くときの引き裂き直進性が十分ではないという課題が生じる。チューブ径が細いと、チューブを引き裂くときのチューブを左右に切り開く(引き裂き)力を、左右均等にチューブに加えることは困難である。引き裂き力が不均一に加えられる場合であっても、チューブの全長に亘って確実に引き裂くためには、優れた引き裂き直進性が必要である。また、カテーテルなどの組み立て治具として使用される場合、引き裂き直進性以外にも、高い熱収縮性が必要であると同時に、組み立てたカテーテルの完成品の寸法精度に影響するため、収縮させたときの寸法精度が要求される。収縮したときの内径、長さ共に数%の誤差が大きな問題となる。
高分子の絡み合い単位の太さは、チューブ長手方向の断面の形状を測定し、その断面の形状を波形として表示して算出した。以下に、図3を用いて説明する。断面の形状について、コンフォーカル顕微鏡(レーザーテック(株)製 H1200、対物レンズ 100倍)を用いて、図3のy軸方向に走査して、断面の、高さ方向(表面形状測定においてZ方向と呼ばれる)の測定を行った。測定範囲における波形のZ方向の幅の中心値を算出し中心線を引いた。中心値は、測定範囲で得られる波形の最大値を有するピークと、最小値を有するピークを除いて算出した。その中心線と波形の交差する点から、次の中心線との交差する点までの間隔、つまり一つの山または谷の幅となる中心線の長さを、高分子の絡み合い単位の太さとした。
(引き裂き直進性の試験)
細径のチューブを引き裂くときにも十分な引き裂き直進性が得られるかを、より明確に判断するために、以下の方法で測定した。長さ1000mmの試料の一方の端部に、長さ40mmの切り込みを設ける。切り込みは治具を用いて、チューブの中心に、チューブ長手方向に平行に設ける。切り込み部から、200mm/minの速度でチューブのもう一方の端部まで引き裂く。引き裂かれた二片のチューブの重量をそれぞれ測定し、重量の比率を求める。比率が50%対50%に近いものほど引き裂き直進性が高いと判断できる。細径のチューブを引き裂くには、比率は50%対50%〜45%対55%の範囲内にすることが必要である。比率が50%対50%〜48%対52%の範囲内、更には50%対50%〜49%対51%の範囲内にすることで引き裂き直進性が向上する。
(成形材料の作製)
テトラフルオロエチレン−ヘキサフルオロプロピレン−パーフルオロアルキルビニルエーテル共重合体(三井デュポンフロロケミカル製FEP−130J)とテトラフルオロエチレン−エチレン共重合体(ETFE:旭硝子製C−55AP)を、FEP/ETFE重量比=80/20で混合し、タンブラーで十分に攪拌した。これをシリンダー径20mmの2軸押出機に投入し、スクリュー回転数45rpm、ダイ温度320℃で押し出し、ペレット成形した。スクリューは、滞留部を4か所設けたパターンのものを使用し、ギャップが0.5mmの組み合わせとした。
(試料チューブの成形)
作成したペレットを用いて、シリンダー径20mmの単軸押出機によって、チューブ成形を行った。スクリューは、フルフライトスクリューを使用し、スクリュー回転数10rpm、ダイ温度390℃、引き落とし比DDR10でサイジングプレート法によってチューブ成形を行った。内径0.5mm、外径0.9mm、肉厚0.2mmのチューブを得た。
(試料チューブの拡張)
成形したチューブを、図4(a)と同じタイプの拡張治具に装着し、治具外部から加熱しながら内部に加圧窒素を注入して、チューブ内径の拡張を行い、長さ1000mmにカットした。チューブの外径は1.33mmであった。
(試料チューブの収縮)
拡張した試料チューブから無作為に10個抜き取り、内径を測定した後、200℃の恒温槽で20min加熱して熱収縮させて試料チューブとした。収縮後の内径を測定して、収縮率を算出した。
(成形材料の作製)
FEP/ETFE重量比を、FEP/ETFE重量比=90/10で混合した以外は、実施例1と同様に作製した。
(試料チューブの成形)
単軸押出機のスクリューに、ダルメージスクリューを使用し、引き落とし比DDRを10として成形した。それ以外の条件は実施例1と同様に成形した。
(試料チューブの拡張・収縮)
実施例1と同様の条件で行った。拡張後のチューブの外径は1.39mmであった。
(成形材料の作製)
FEP/ETFE重量比を、FEP/ETFE重量比=97/3で混合した以外は、実施例1と同様に作製した。
(試料チューブの成形)
単軸押出機のスクリューに、ダルメージスクリューを使用し、引き落とし比DDRを50として成形した。それ以外の条件は実施例1と同様に成形した。
(試料チューブの拡張)
成形したチューブを、図4(b)と同じタイプの拡張治具に装着し、治具外部から加熱しながら内部に加圧窒素を注入して、チューブ内径の拡張を行い、長さ1000mmにカットした。チューブの外径は1.36mmであった。
(試料チューブの収縮)
実施例1と同様の条件で行った。
(成形材料の作製)
テトラフルオロエチレン−ヘキサフルオロプロピレン−パーフルオロアルキルビニルエーテル共重合体(三井デュポンフロロケミカル製FEP−130J)とテトラフルオロエチレン−エチレン共重合体(ETFE:旭硝子製C−55AP)を、各重量比で混合し、これをシリンダー径20mmの2軸押出機に投入し、スクリュー回転数45rpm、ダイ温度320℃で押し出し、ペレット成形した。スクリューは、ギャップを−1.5mm(スクリューの重なり部分が1.5mm)、滞留部を設けないパターンのものを使用した。
(試料チューブの成形)
作製したペレットを用いて、シリンダー径20mmの単軸押出機によって、チューブ成形を行った。スクリューは、フルフライトスクリューを使用し、スクリュー回転数10rpm、引き落とし比DDR10、ダイ温度390℃でサイジングプレート法によってチューブ成形を行った。内径0.5mm、外径0.9mm、肉厚0.2mmのチューブを得た。
(試料チューブの拡張)
成形したチューブを、図4(a)と同じタイプの拡張治具に装着し、治具外部から加熱しながら内部に加圧窒素を注入して、チューブ内径の拡張を行い、長さ1000mmにカットした。
(試料チューブの収縮)
拡張した試料チューブから無作為に10個抜き取り、内径を測定した後、200℃の恒温槽で20min加熱して熱収縮させて試料チューブとした。収縮後の内径を測定して、収縮率を算出した。
(成形材料の作製)
テトラフルオロエチレン−パーフルオロアルキルビニルエーテル共重合体(以下、「PFA」と言う。)(三井フロロデュポンPFA−340J)とC−55APを、PFA/ETFE重量比=97/3で混合した以外は、実施例3と同様に作製した。
(試料チューブの成形)
実施例3と同様に成形した。
(試料チューブの拡張)
実施例3と同様に拡張した。チューブの外径は1.18mmであった。
(試料チューブの収縮)
実施例3と同様に行った。
作製した試料チューブについて各測定を実施したところ、高分子の絡み合い単位の太さが8μm、引き裂き直進性が52:48、収縮率が35%であった。フッ素樹脂の種類に依らず、高分子の絡み合い単位の太さと引き裂き直進性との間に相関関係がみられた。
Claims (5)
- ベース樹脂として、少なくともフッ素樹脂を、含むチューブであって、200℃で加熱した時の収縮率が35%以上であり、200℃にて35%以上収縮させた後の、チューブ長手方向の断面において観察される、高分子の絡み合い単位の太さが、1μm〜9μmであることを特徴とする引き裂き性を有する熱収縮チューブ。
- ベース樹脂として、少なくともフッ素樹脂を、含むチューブであって、200℃で加熱した時の収縮率が44%以上であり、200℃にて44%以上収縮させた後の、チューブ長手方向の断面において観察される、高分子の絡み合い単位の太さが、1μm〜9μmであることを特徴とする引き裂き性を有する熱収縮チューブ。
- 前記フッ素樹脂がテトラフルオロエチレン及びヘキサフルオロプロピレンを構成モノマーとして含む共重合体であることを特徴とする、請求項1または2に記載の引き裂き性を有する熱収縮チューブ。
- 引き裂き直進性を表す比率が、50%対50%〜48%対52%の範囲内であることを特徴とする、請求項1〜3に記載の引き裂き性を有するチューブ。
- チューブの外径が1.39mm以下であることを特徴とする、請求項1〜4に記載の引き裂き性を有する熱収縮チューブ。
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EP15192342.2A EP3050696B1 (en) | 2015-02-01 | 2015-10-30 | Heat-shrinkable tube having tearability |
US14/927,572 US9464149B2 (en) | 2015-02-01 | 2015-10-30 | Heat-shrinkable tube having tearability |
CN201610065436.8A CN105840920B (zh) | 2015-02-01 | 2016-01-29 | 具有撕裂性的热缩管 |
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JP2017044335A (ja) * | 2015-08-24 | 2017-03-02 | 株式会社潤工社 | 引き裂き性を有する熱収縮チューブ |
US9957384B2 (en) | 2015-08-24 | 2018-05-01 | Junkosha Inc. | Heat-shrinkable tube having tearability |
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CN106221080A (zh) * | 2016-08-18 | 2016-12-14 | 苏州泰斯拓伟机电设备有限公司 | 一种特氟龙热缩管的制备方法 |
CN106221078A (zh) * | 2016-08-18 | 2016-12-14 | 苏州泰斯拓伟机电设备有限公司 | 一种改性氟弹性体热缩管及其制备方法 |
US10898616B1 (en) | 2017-07-11 | 2021-01-26 | Teleflex Medical Incorporated | Peelable heat-shrink tubing |
CN108081567B (zh) * | 2017-12-26 | 2022-05-24 | 深圳市沃尔核材股份有限公司 | 一种热缩分支指套的生产方法及生产系统 |
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JP7215842B2 (ja) * | 2018-07-30 | 2023-01-31 | グンゼ株式会社 | チューブ及び該チューブの製造方法 |
WO2020158854A1 (ja) * | 2019-01-31 | 2020-08-06 | 株式会社 潤工社 | 引き裂き性を有する熱収縮チューブ |
US20220349500A1 (en) * | 2019-08-30 | 2022-11-03 | Nissei Electric Co., Ltd. | Heat Shrink Tube and Method for Forming Same |
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JP6990501B2 (ja) | 2015-08-24 | 2022-02-03 | 株式会社潤工社 | 引き裂き性を有する熱収縮チューブ |
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