JP4521393B2 - 二軸延伸プラスチックチューブの連続製造方法と、この方法を実施する製造ライン - Google Patents
二軸延伸プラスチックチューブの連続製造方法と、この方法を実施する製造ライン Download PDFInfo
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
- Shaping By String And By Release Of Stress In Plastics And The Like (AREA)
- Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
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Description
上記の内部の圧力に対抗する圧力は機械的に加えることができる。
上記の内部の圧力に対抗する圧力はサイジング装置の入口に加えるのが有利である。
この機械的手段はローラまたはコロで構成できる。ローラの軸はチューブの縦方向に対して直角な軸に回転に取り付けられたブラケットで支持できる。ローラは弾性手段や位置決めネジを素材の壁に押し付けることができる。
上記の内部の圧力に対抗する圧力を下流で測定されたチューブの厚さに応じて調節する自動制御装置を設けるのが有利である。
本発明の上記手段およびそれ以外の手段は添付図面を参照した以下の実施例の説明から明らかになるであろう。しかし、本発明が下記実施例に制限されるものではない。
温度調節された最後の冷却槽3、すなわち[図1]で最も右側にある冷却槽は素材Eを分子配向温度範囲内の温度に加熱するように設計されている。PVCの場合、この温度は90〜110℃の範囲にある。
冷却槽3の出口には内部プラグ7上に素材Eを押し付けるリング6が固定されている。内部プラグ7は上記の開口部の上流側でチューブ6の内周と係合している。
定常運転状態が確立したときには[図1]に概念的に示すように、素材Eはリング6の出口で流体の内圧によってサイジング装置8の内径に達するまで放射方向に膨張する。
チューブ材料Tの最終特性はリング6とサイジング装置8との間での素材Eの放射方向膨張度に依存する。この放射方向膨張度が大きければ大きいほどチューブ材料Tの機械特性は良くなる。
この欠点を無くすため、特に、最大値M点に対応する放射方向膨張比を超える放射方向膨張比で、円形断面に厚さに差を生じさせずに、放射方向へさらに膨張させるために、本発明では対抗圧力(pression antagoniste)すなわち内圧から減算される逆の圧力を外側から加えて素材の壁のストレスを減する。
[図3]に示す変形例では上記バネ21の代わりに、ブレード22に螺合し且つ取付板17に当接した位置決めネジ23を用いている。ローラ13によって加わる圧力はネジ23を締め付けたり、緩めることで調節する。
[図2]に示す実施例では、ローラ13が互いにほぼ直角な4つの領域に設けられている。このような解決策は泡(バブル)の径(サイジング装置8の入口での径)が約100mmの素材に適用できる。[図2]では4つのローラ13が素材の母線の上下左右にそれぞれ設置されている。これらのローラ13は泡(バブル)が膨張したときに材料と接触して位置決めされる。ローラ13に対応する4つの母線における二軸延伸チューブの厚さを下流で測定し、仕様書の目標値と比較する。例えば手動で圧力を調整し、ローラと接触する一つまたは複数の母線上でこのシステムを用いて泡(バブル)の壁に加える。
外側からの上記対抗圧力はチューブの壁の表面層の摩擦および局部冷却が事実上生じないように加える必要がある。
各ローラを軸線X−Xを中心に回転自在に取付けられた一つのリング部材で支持し、軸線X−Xを中心とした各ローラの角度位置をチューブTの周りに配置したセンサ25で検出した厚さのバチツキの角度位置を関数にして自動制御することができる。
本発明では最大値M([図5])を超えて放射方向に膨張をした場合でもチューブの全円形断面において事実上均一な厚さが保証できる。従って、所定外径の素材から得られる最終外径の範囲を広げることができる。特に、優れた機械特性を有するハイクラスのチューブを得ることができる(クラスのレベルは素材外径の相対増加度に依存する)。
径が約100mmのチューブの場合、従来方法で得られる円形断面のチューブの厚さは0.3〜0.5mmであるが、本発明では0.1mm以下(これに限定されるものではない)にすることができる。
Claims (11)
- 押出し成形で素材(E)を作り、この素材(E)を分子配向温度まで加熱し、軸線方向に互いに離れた2つの密閉装置(7、11)の間で素材(E)の内部に流体圧力を加えて素材(E)を放射方向に膨張させ、素材(E)に軸線方向引張り力を加えて寸法調整(8)と冷却(9)とを行なう、二軸延伸によってプラスチックチューブを連続的に製造する方法において、
放射方向に膨張した少なくとも1つの帯域で素材の壁へ外側から内部の圧力に対抗する圧力を加え(13)、上記の内部の圧力に対抗する圧力は制御下に膨張が続くのを妨げず、内圧よりも低く、確実に膨張できるだけの高さで、材料の厚さを同一円周上で一定にする圧力であり、上記の内部の圧力に対抗する圧力はこの圧力が存在しないと無制御下に膨張を続ける帯域のみに局部的に加えることを特徴とする方法。
1に記載の方法。 - 上記の内部の圧力に対抗する圧力を、上記2つの密閉装置(7、11)の最初の密閉装置である内部プラグ(7)と寸法調整と冷却とを行なう装置(8、9)との間の帯域のみに局部的に加える請求項1に記載の方法。
- 上記の内部の圧力に対抗する圧力を寸法調整装置(8)の入口で加える請求項1または2に記載の方法。
- 上記の内部の圧力に対抗する圧力を機械的に加える請求項1〜3のいずれか一項に記載の方法。
- 素材を成形するための押出機(2)と、素材を分子配向温度に加熱するための少なくとも1つの加熱槽(3)と、素材を放射方向に膨張させる装置(4、5、7、11)と、寸法調整装置(8)と、チューブの冷却装置(9)と、チューブ出口に設けた少なくとも1つの下流の引張り機(10)とを有する請求項1〜4のいずれか一項に記載の方法を実施するための製造ラインにおいて、
放射方向に膨張する帯域(A)に、素材(E)の内部の圧力に対抗する圧力を素材(E)の外壁に加える手段(13、21;13、23;13、24)を有することを特徴とする製造ライン。 - 上記の内部の圧力に対抗する圧力を素材の外壁に加える手段が機械的手段(13)である請求項5に記載の製造ライン。
- 上記の機械的手段がローラ(13)から成る請求項6に記載の製造ライン。
- ローラの軸(14)がブラケット(16)に支持され、このブラケット(16)がチューブの縦方向(X−X)に対して直角な軸(18)に回動自在に取り付けられている請求項7に記載の製造ライン。
- ローラ(13)が弾性手段(21)によって素材の壁上に押圧されている請求項8に記載の製造ライン。
- ローラ(13)が流体ラム(24)によって押圧され、さらに、上記の内部の圧力に対抗する圧力を下流で測定された(25)チューブの厚さに応じて調節する自動制御装置を有する請求項8に記載の製造ライン。
- 直径が100mmのチューブの場合に4つのローラ(13)を円周上に配置する請求項7に記載の製造ライン。
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FR0302824A FR2851954B1 (fr) | 2003-03-07 | 2003-03-07 | Procede de fabrication en continu de tubes en matiere plastique avec etirage bi-axial et ligne de fabrication pour ce procede |
PCT/FR2004/000501 WO2004080682A2 (fr) | 2003-03-07 | 2004-03-03 | Procede de fabrication en continu de tubes en matiere plastique avec etirage bi-axial et ligne de fabrication pour ce procede. |
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CN100418733C (zh) | 2008-09-17 |
CA2517626C (fr) | 2009-11-24 |
ZA200506217B (en) | 2006-10-25 |
PT1603731E (pt) | 2007-07-16 |
AU2004220294A1 (en) | 2004-09-23 |
DE602004006097D1 (de) | 2007-06-06 |
WO2004080682A3 (fr) | 2004-10-28 |
US20060255497A1 (en) | 2006-11-16 |
EP1603731A2 (fr) | 2005-12-14 |
RU2005131008A (ru) | 2006-06-27 |
NZ541754A (en) | 2007-02-23 |
NO20054561L (no) | 2005-10-04 |
PL1603731T3 (pl) | 2007-09-28 |
DE602004006097T2 (de) | 2008-01-10 |
CA2517626A1 (fr) | 2004-09-23 |
MXPA05009499A (es) | 2005-10-18 |
BRPI0408166A (pt) | 2006-03-21 |
EP1603731B1 (fr) | 2007-04-25 |
ATE360516T1 (de) | 2007-05-15 |
FR2851954B1 (fr) | 2006-07-07 |
ES2285437T3 (es) | 2007-11-16 |
US7390455B2 (en) | 2008-06-24 |
WO2004080682A2 (fr) | 2004-09-23 |
AU2004220294B2 (en) | 2009-07-23 |
FR2851954A1 (fr) | 2004-09-10 |
CN1756644A (zh) | 2006-04-05 |
KR20060007004A (ko) | 2006-01-23 |
JP2006519715A (ja) | 2006-08-31 |
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