JP3891822B2 - Cooling device for the production of heat shrinkable tubes using thermoplastics - Google Patents
Cooling device for the production of heat shrinkable tubes using thermoplastics Download PDFInfo
- Publication number
- JP3891822B2 JP3891822B2 JP2001332577A JP2001332577A JP3891822B2 JP 3891822 B2 JP3891822 B2 JP 3891822B2 JP 2001332577 A JP2001332577 A JP 2001332577A JP 2001332577 A JP2001332577 A JP 2001332577A JP 3891822 B2 JP3891822 B2 JP 3891822B2
- Authority
- JP
- Japan
- Prior art keywords
- cooling
- tube
- inner diameter
- water
- thermoplastic resin
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 238000001816 cooling Methods 0.000 title claims description 60
- 238000004519 manufacturing process Methods 0.000 title claims description 13
- 229920001169 thermoplastic Polymers 0.000 title description 3
- 239000004416 thermosoftening plastic Substances 0.000 title description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 40
- 239000000498 cooling water Substances 0.000 claims description 17
- 229920005992 thermoplastic resin Polymers 0.000 claims description 16
- 238000001125 extrusion Methods 0.000 claims description 11
- 239000000155 melt Substances 0.000 claims description 10
- 230000000149 penetrating effect Effects 0.000 claims description 7
- 230000002093 peripheral effect Effects 0.000 claims description 6
- NJPPVKZQTLUDBO-UHFFFAOYSA-N novaluron Chemical compound C1=C(Cl)C(OC(F)(F)C(OC(F)(F)F)F)=CC=C1NC(=O)NC(=O)C1=C(F)C=CC=C1F NJPPVKZQTLUDBO-UHFFFAOYSA-N 0.000 claims 3
- 238000005057 refrigeration Methods 0.000 claims 1
- 238000000034 method Methods 0.000 description 11
- 239000004800 polyvinyl chloride Substances 0.000 description 11
- 229920000915 polyvinyl chloride Polymers 0.000 description 11
- 229920005989 resin Polymers 0.000 description 11
- 239000011347 resin Substances 0.000 description 11
- 230000008569 process Effects 0.000 description 8
- 239000000654 additive Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 229920000139 polyethylene terephthalate Polymers 0.000 description 3
- 239000005020 polyethylene terephthalate Substances 0.000 description 3
- 239000007787 solid Substances 0.000 description 3
- WOZVHXUHUFLZGK-UHFFFAOYSA-N terephthalic acid dimethyl ester Natural products COC(=O)C1=CC=C(C(=O)OC)C=C1 WOZVHXUHUFLZGK-UHFFFAOYSA-N 0.000 description 3
- 239000004677 Nylon Substances 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000005537 brownian motion Methods 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- JBKVHLHDHHXQEQ-UHFFFAOYSA-N epsilon-caprolactam Chemical compound O=C1CCCCCN1 JBKVHLHDHHXQEQ-UHFFFAOYSA-N 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 229920001778 nylon Polymers 0.000 description 2
- 230000000704 physical effect Effects 0.000 description 2
- 238000006116 polymerization reaction Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 230000005653 Brownian motion process Effects 0.000 description 1
- 208000005623 Carcinogenesis Diseases 0.000 description 1
- 239000004952 Polyamide Substances 0.000 description 1
- -1 Polyethylene terephthalate Polymers 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 238000007259 addition reaction Methods 0.000 description 1
- 229920006125 amorphous polymer Polymers 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- 230000036952 cancer formation Effects 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
- 238000003763 carbonization Methods 0.000 description 1
- 231100000504 carcinogenesis Toxicity 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000006482 condensation reaction Methods 0.000 description 1
- 238000004132 cross linking Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000007033 dehydrochlorination reaction Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- FYIBGDKNYYMMAG-UHFFFAOYSA-N ethane-1,2-diol;terephthalic acid Chemical compound OCCO.OC(=O)C1=CC=C(C(O)=O)C=C1 FYIBGDKNYYMMAG-UHFFFAOYSA-N 0.000 description 1
- 230000009477 glass transition Effects 0.000 description 1
- 230000009931 harmful effect Effects 0.000 description 1
- 229910001385 heavy metal Inorganic materials 0.000 description 1
- 230000007062 hydrolysis Effects 0.000 description 1
- 238000006460 hydrolysis reaction Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 239000002440 industrial waste Substances 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 230000005012 migration Effects 0.000 description 1
- 238000013508 migration Methods 0.000 description 1
- 238000006864 oxidative decomposition reaction Methods 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 239000000049 pigment Substances 0.000 description 1
- 239000004014 plasticizer Substances 0.000 description 1
- 229920002647 polyamide Polymers 0.000 description 1
- 229920006122 polyamide resin Polymers 0.000 description 1
- 229920001225 polyester resin Polymers 0.000 description 1
- 229920006149 polyester-amide block copolymer Polymers 0.000 description 1
- 239000002685 polymerization catalyst Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000004513 sizing Methods 0.000 description 1
- 238000005809 transesterification reaction Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- 239000003643 water by type Substances 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/88—Thermal treatment of the stream of extruded material, e.g. cooling
- B29C48/911—Cooling
- B29C48/9115—Cooling of hollow articles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/88—Thermal treatment of the stream of extruded material, e.g. cooling
- B29C48/90—Thermal treatment of the stream of extruded material, e.g. cooling with calibration or sizing, i.e. combined with fixing or setting of the final dimensions of the extruded article
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
- B29C48/09—Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/88—Thermal treatment of the stream of extruded material, e.g. cooling
- B29C48/919—Thermal treatment of the stream of extruded material, e.g. cooling using a bath, e.g. extruding into an open bath to coagulate or cool the material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/92—Measuring, controlling or regulating
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C61/00—Shaping by liberation of internal stresses; Making preforms having internal stresses; Apparatus therefor
- B29C61/02—Thermal shrinking
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/88—Thermal treatment of the stream of extruded material, e.g. cooling
- B29C48/90—Thermal treatment of the stream of extruded material, e.g. cooling with calibration or sizing, i.e. combined with fixing or setting of the final dimensions of the extruded article
- B29C48/904—Thermal treatment of the stream of extruded material, e.g. cooling with calibration or sizing, i.e. combined with fixing or setting of the final dimensions of the extruded article using dry calibration, i.e. no quenching tank, e.g. with water spray for cooling or lubrication
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2995/00—Properties of moulding materials, reinforcements, fillers, preformed parts or moulds
- B29K2995/0037—Other properties
- B29K2995/0049—Heat shrinkable
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2023/00—Tubular articles
Description
【0001】
【発明の属する技術の分野】
本発明は、熱可塑性樹脂を用いて熱収縮チューブを製造するにあたり、固有粘度が低い熱可塑性樹脂を溶融させながら未延伸状態で均一な厚さと直径をもつ管状に成形する、熱可塑性樹脂を用いた熱収縮チューブの製造のための冷却装置に関する。
【0002】
【従来の技術】
一般に、パイプまたは電解コンデンサの絶縁被覆及び乾電池包装などに用いられる大抵のチューブはポリ塩化ビニール(以下、PVCと略称する)を素材としている。
【0003】
このようなPVC樹脂は熱を加えて転移点を超えると、非結晶部分のPVC分子セグメントがミクロブラウン運動を起こし、このときに分子間間隔が拡大して分子間の結合力が弱化すると同時に軟化が生じ、この場合、引っ張り強度及び硬度などの物理的性質は減少する反面、弾性は増加し、PVCに加えられる温度が150℃を超えると、ミクロブラウン運動が一層活発になりながら結晶部分までに影響を与えて分子間結合力が急激に減少し、このような状態で圧力を加えると分子間に容易に流動を起こす熱可塑性を示すことになる。
【0004】
また、PVCはガラス転移温度が約80℃の非結晶性高分子物質で、熱収縮チューブを成形するためには普通230℃の高温の熱を必要とするが、このような加熱工程中に発生するガスは作業環境の面で迅速な改善対策が求められており、押出工程中に炭化により随時に金型を掃除して再稼働しなければならないため、工程実行中に不良が大量に発生するかまたは生産性が低下して相当な製造原価の上昇要因となり、特に、現在、不良品発生のときにも再活用が不可能であって産業廃棄物として処理している。
【0005】
特に、PVCは樹脂自体の限界のために高耐熱性製品に品質を合わせることが相当に難しく、紫外線などのような高エネルギーに接すると活性化されて脱塩酸、分子切断架橋化、酸化分解などの複合劣化(degradation)現象を起こし、軟質製品の場合には可塑剤の移動(migration)により漸次製品が硬化したり、または周辺の湿気と反応して加水分解現象が進行するという問題点があった。
【0006】
一方、先進国より始まった人体に与える有害性論議のため、各種重金属類の規制が始まり、ガス剤の発ガン誘発などの報告が出ており、一部の玩具製品ではPVCに主に用いられるDOPの使用を禁止するまでに至って、一部では既にPVC、鉛などの段階的縮小案が準備されている。
【0007】
そこで、このようなPVCの代替素材として最近、開発に拍車を加えているものは、DMT工法とTPA工法の重合工程を経て作られ、テレフタル酸ジメチルまたはテレフタル酸エチレングリコールなどに重合触媒、各種添加物などを付加してエステル交換反応、重合反応、冷却乾燥工程を通して製造されるPET(Polyethylene terephthalate)樹脂と、カプロラクタムに水及び各種添加剤を含めて添加及び縮合反応工程を通して重合及び固化して製造するNylon(polyamide)樹脂のような比較的粘度がPVCよりも低い熱可塑性樹脂である。
【0008】
【発明が解決しようとする課題】
しかるに、押出工程を経て押し出されるPET樹脂とNylon樹脂のような低粘度の熱可塑性樹脂は溶融粘度を必要とするせん断率を持たないため、管状チューブまたはパイプ製造のための押出成形は現在の押出成形方式によってはとうてい成形が不可能であるという問題点があった。
【0009】
そこで、本発明の目的は、押出工程を通して押し出される低粘度樹脂を所望の直径と厚さをもつ管状に急冷させるための冷却装置を提供することにある。
【0010】
【課題を解決するための手段】
(1) このような目的を達成するため本発明は、押出台から押し出される溶融熱可塑性樹脂を垂直貫通させるようにしながら冷却水との接触により急冷させ、チューブの外径を調節する一つ以上の冷却台と、前記冷却台を貫通して誘導される管状のチューブを下向きに貫通させるようにしながら真空の吸入圧によりチューブの外径が維持されるようにする真空台と、所定温度に維持される水を貯蔵し、前記真空台から誘導されるチューブが通過しながら再度冷却されるようにする水槽と、前記水槽内に誘導される未延伸管状チューブを一定速度で引っ張って移送させるテークオフローラーと、からなることを特徴とする。
【0011】
(2) 前記冷却台は内径部が段差をもつ形状で、内径面と外径面の間には上向き開放される凹溝が形成され、外周縁端部には垂直の棒が貫通されながら支持される台本体と、前記台本体の段差をもつ内径部に積層されるスリーブリングと多孔質リングと、前記台本体の内径部で上側に積層される多孔質リングはその上側の外周縁部がそれぞれ垂直の棒に一端が支持されるようにしたクランプにより固定される構成をもつことを特徴とする(1)に記載の熱可塑性樹脂を用いた熱収縮チューブの製造のための冷却装置。
【0012】
(3) 前記上向き開放された凹溝には水温が5〜60℃の冷却水が7〜50l/分速度で流入することを特徴とする(2)に記載の熱可塑性樹脂を用いた熱収縮チューブの製造のための冷却装置。
【0013】
(4) 前記スリーブリングと前記多孔質リングは内径がチューブの外径に従いその寸法が決定されることを特徴とする(2)に記載の熱可塑性樹脂を用いた熱収縮チューブの製造のための冷却装置。
【0014】
(5) 前記真空台は、中央が垂直に貫通するようにしながら段差をもつ形状で、内径部の上部は下部よりも内径が拡張されるようにして内部に真空圧が供給される台本体と、上向き開放された上部側内径部に嵌合されるスリーブリングと多孔質リングとからなることを特徴とする(1)に記載の熱可塑性樹脂を用いた熱収縮チューブの製造のための冷却装置。
【0015】
【発明の実施の形態】
以下、本発明の実施形態について図面を用いて詳しく説明する。
【0016】
図1に示すように本発明は大きく冷却台10、真空台20、水槽30及びテークオフローラー40から構成される。
【0017】
冷却台10はその上側の押出台(図示せず)から自由落下により押し出される低粘度及び高温の溶融樹脂が垂直に貫通しながら通過するようにしてメルトを急冷させる構成で、冷却台10には所定温度をもつ冷却水が供給され、冷却水が冷却台10を垂直に通過するメルトの外径面に接触しながら冷却と同時に水膜の形成により管状チューブが安定に維持されるようにしたものである。
【0018】
このとき、冷却台10は少なくとも一つ以上が所定間隔に具備されて、順次的な逐次冷却方式により冷却するのが一番好ましい。
【0019】
一方、冷却台10は、図2に示すように、内径部が段差をもつ形状で、内径面と外径面の間には上向き開放される凹溝11aが形成され、外周縁の端部には垂直の棒60が貫通しながら支持される構成により台本体11が具備される。
【0020】
前記台本体11の段差をもつ内径部には下部にスリーブリング12が載せられ、その上には多孔質リング13が積層され、上向き開放凹溝11aには水温が5〜60℃の冷却水が7〜50l/分速度に流入するようにする。
【0021】
このとき、台本体11で凹溝11aの内側に形成される内側の側壁は外側の側壁よりは上端部の高さが低く形成されるようにして、凹溝11a内に供給される冷却水が内側の側壁の上端を超えて内径部側に誘導されながら冷却水の水圧が分散されるようにする。
【0022】
一方、台本体11の内径部で上側に積層される多孔質リング13はその上側の外周縁部をそれぞれ垂直の棒60に一端が支持されるクランプ14により固定されるようにする。
【0023】
台本体11の内径部に挿入されてクランプ14により固定されるスリーブリング12と多孔質リング13は内径がチューブの外径に従いその寸法が決定されるようにする。
【0024】
そして、このような冷却台10は、上述のように一つ以上が多段に具備される逐次冷却方式とし、形成しようとするチューブの規格に従い各冷却台10間の距離もまた決定されるようにする。
【0025】
このようにして多段に具備される冷却台10の直下部には真空台20を具備する。
【0026】
真空台20は冷却台10を貫通して誘導されるチューブを再び垂直に通過させながら真空の吸入圧によりメルトを管状に安定させるように維持するものである。
【0027】
このような真空台20は、図3のように中央は垂直に貫通するようにしながら段差をもち、特に内径部の上部は下部よりも内径が拡張されるようにした形状の台本体21を具備し、前記台本体21の内部には真空圧が供給されるようにし、上向きに開放された上部側内径部には冷却台10と同様にスリーブリング22と多孔質リング23が積層されるようにした構成である。
【0028】
そして、台本体21には冷却台10と同様に、冷却水を流入しながら多孔質リング23に持続的に冷却水を供給するようにする。
【0029】
一方、上部の多段式冷却台10と真空台20は外周縁部に挿入される棒60により同時に支持され、特に垂直の棒60で冷却台10と真空台20は上下に移動可能に固定されるようにする。
【0030】
真空台20の直下部に具備される水槽30は所定温度に維持される水を多量に貯蔵する構成で、真空台20を貫通して誘導される管状メルトがしばらく浸されるようにする構成である。
【0031】
このような水槽30の内部に装着されるテークオフローラー40は水槽30に浸される管状メルトを一定速度で引っ張って移送させる構成である。
【0032】
このとき、メルトが水槽30に過度に深く浸されると、水圧によりメルトの外形が変形するおそれがあるため、テークオフローラー40の装着位置は水槽30内で水圧がメルトに影響しない程度の深さに具備されるようにすることが好ましい。
【0033】
テークオフローラー40を巻き回して引き出すメルトは少なくとも一つ以上のガイドローラー50を経て次の工程の延伸工程に移送される。
【0034】
このような構成による本発明の作用について詳しく説明する。押出工程でメルトは約0.5〜1.0dl/gの粘度と約150〜330℃の温度をもつ低粘度状態に引き出される。
【0035】
このような低粘度メルトは多段に具備される冷却台10を通過しながら逐次冷却方式により冷却する。
【0036】
このとき、低粘度樹脂による未延伸チューブの外径は冷却台10のスリーブリング12の内径により決定され、スリーブリング12の上側に積層される多孔質リング13は通過する低粘度メルトの外径に微細に水膜が形成されるようにしながら急冷されるようにする。なお、通常は、スリーブリング12の内径は、多孔質リング13の内径と同じかそれより大きい。
【0037】
即ち、台本体11の凹溝11aに冷却水が持続的に供給されながら凹溝11aから台本体11の内径壁上端部を通して多孔質リング13に誘導されると、多孔質リング13では吸収される冷却水により中央を通過するチューブとの間に微細に水膜を形成し、このような水膜の形成によりチューブが冷却されながら外径の変形を防止させることになる。なお、多孔質リング13とチューブの間に水膜を形成した水は、冷却台の内径を伝わって、より下段の冷却台又は真空台へと流れる。凹溝13aから溢れた水も同様であるが、これらの水は製造される過程にあるチューブを冷却しながら、最終的には最下層に位置する水槽30内に落下するか、真空台20に引かれることになる。このため、水を使って冷却をするにしても、構造上、水漏れ等による諸問題が発生しないという効果がある。
【0038】
多段の冷却台10を経ながら順次逐次冷却されるチューブは真空台20を再度通過し、このとき、真空台20では通過するチューブを冷却台10と同様に、冷却水により冷却される。
【0039】
そして、台本体21に供給される吸入圧によって、チューブの外径を台本体21の中央のホール内径に密着するようにして、冷却台10から誘導されるチューブの外径がそのまま維持されるかまたはより拡張されるようにするものである。
【0040】
このような作用は真空台20の内径にチューブの外径が固定されるようにするので、所望の厚さと外径をもつ未延伸チューブが成形されるようになる。
【0041】
一方、真空台20で真空圧により外径が固定された未延伸チューブは水槽30内の水中を通過してテークオフローラー40に誘導され、テークオフローラー40では未延伸チューブを一定速度で引き出してその一方の側で上部に具備されるガイドローラー50を通して次の工程に移送されるようにする。
【0042】
このように本発明は押出台から吐き出される低粘度の樹脂を急冷させるにあたり、多段の逐次冷却方式により冷却されるようにして水圧による変形を防止すると共に、一定した厚さと外径をもつソリッド状態の管状チューブを得るのにその特徴がある。
【0043】
このときの樹脂はポリエステルとポリアミドなどが全て可能である。
【0044】
【実施例】
以下、本発明を実施例に基づき説明するが、本発明は実施例に限定されるものではない。
【0045】
本発明でチューブの一例として熱可塑性ポリエステル系樹脂を乾燥機で水分率100ppm以下に乾燥し適正量の添加剤及び顔料を混合してホッパに投入した後、押出機シリンダ温度220〜290℃に溶融して円形台を通して押し出した。押出台から押し出される高温の低粘度樹脂がスリーブリングと多孔質リングの大きさがφ20mmの2つの冷却台10を垂直に貫通しながら30℃の冷却水と30l/分の速度で接触し、このため低粘度樹脂が急冷されながらソリッド状態となると同時にチューブの外径を調節した。冷却台10を貫通して誘導される管状のチューブは真空台20を下向きに貫通しながら真空の吸入圧によりメルトの外径が維持されるようにした後、水槽30を通過しながら30℃の水により再度冷却された後にテークオフローラー40で未延伸管状チューブを一定速度で引っ張って移送させると、長軸の長さが16mmで、短い軸の長さが400μmの未延伸チューブが製作される。
【0046】
このような未延伸チューブを75℃に予熱した後φ19mmの延伸管で延伸温度100℃に延伸して冷却温度18℃に冷却すると、最終的に長軸の長さが30mm、短軸の長さが100μm、幅収縮率45%、長収縮率7%の製品が得られる。
【0047】
一方、前記例と共に水槽、冷却水温度及び冷却水量を異にしてそのときの加工特性及び物性の変化をチェックした他の例を表1に示す。
【0048】
このように製造されるチューブの加工特性は正常作業の可能な作業性を示し、特に、このようなチューブ製品を肉眼で見ると、凹凸がなく長軸の長さが一定した状態を示す表面形状をもつ。
【0049】
特に、製造された収縮チューブ製品をそれぞれ長さ100mmに切断して両面を開けて98±2℃の沸騰水に30秒間に沈積した後切断面の形状を肉眼で確認すると、収縮後の形状も切断面の形状がもとの状態を維持することがわかる。
【0050】
【表1】
【0051】
【発明の効果】
上述したように本発明に従い熱収縮チューブを提供するにあたり、低粘度及び高温の未延伸チューブを逐次冷却方式により急冷させることにより、ソリッド状態となるようにすると共に水圧による変形を防止して均一な厚さと所望する大きさの外径をもつ形状の未延伸チューブを製作することができるという効果がある。また、水冷却用の水透過性リング(多孔質リング)を通過させることによって、冷却と所定のサイズの形成を行うようにしているため、効率的である。更に、冷却用の多孔質リングと、サイズ決めのためのスリーブリングとが、何れもクランプにより容易に取り外しが可能なものとなっているため、製造したいチューブに応じてフレキシブルに対応することができるとともに、装置の組み立てや部材の交換も楽で、メインテナンスも容易である。
【図面の簡単な説明】
【図1】 本発明による冷却装置の構造図である。
【図2】 本発明の冷却台を示した断面図である。
【図3】 本発明の真空台を示した断面図である。
【符号の説明】
10 冷却台
11 台本体
12 スリーブリング
13 多孔質リング
14 クランプ
15 内径部
15a 段差
16s 内径面
16t 外径面
20 真空台
21 台本体
22 ソリッドリング
23 多孔質リング
30 水槽
40 テークオフローラー[0001]
[Field of the Invention]
The present invention uses a thermoplastic resin that is molded into a tube having a uniform thickness and diameter in an unstretched state while melting a thermoplastic resin having a low intrinsic viscosity when manufacturing a heat-shrinkable tube using a thermoplastic resin. The present invention relates to a cooling device for manufacturing a heat-shrinkable tube.
[0002]
[Prior art]
In general, most tubes used for insulation coating of pipes or electrolytic capacitors and dry battery packaging are made of polyvinyl chloride (hereinafter abbreviated as PVC).
[0003]
When such a PVC resin is heated and the transition point is exceeded, the PVC molecular segment in the amorphous part undergoes micro-Brownian motion. At this time, the intermolecular spacing is expanded and the intermolecular bond strength is weakened and softened at the same time. In this case, physical properties such as tensile strength and hardness decrease, but elasticity increases, and when the temperature applied to PVC exceeds 150 ° C, the micro Brownian motion becomes more active and reaches the crystal part. The intermolecular bonding force is drastically decreased due to the influence, and when pressure is applied in such a state, thermoplasticity that easily causes flow between molecules is exhibited.
[0004]
PVC is an amorphous polymer with a glass transition temperature of about 80 ° C, and heat of 230 ° C is usually required to form heat-shrinkable tubes. As for the gas to be used, quick improvement measures are required in terms of the working environment, and since the mold must be cleaned and restarted at any time by carbonization during the extrusion process, a lot of defects occur during the process execution However, productivity decreases and causes a considerable increase in manufacturing costs. In particular, even when defective products are generated, they cannot be reused and are treated as industrial waste.
[0005]
In particular, PVC is considerably difficult to match the quality of high heat-resistant products due to the limitations of the resin itself, and activated when exposed to high energy such as ultraviolet rays, dehydrochlorination, molecular cutting cross-linking, oxidative decomposition, etc. In the case of soft products, there is a problem that the product gradually hardens due to the migration of the plasticizer or the hydrolysis phenomenon proceeds by reacting with the surrounding moisture. It was.
[0006]
On the other hand, due to the debate on harmful effects on human bodies that began in developed countries, regulations on various heavy metals have started, and reports such as the induction of gas carcinogenesis have been issued, and some toy products are mainly used for PVC Until the use of DOP was banned, some plans for gradual reduction such as PVC and lead have already been prepared.
[0007]
Therefore, as a substitute material for such PVC, recently added to the development is the polymerization process of DMT method and TPA method. Polymerization catalyst and various additives are added to dimethyl terephthalate or ethylene glycol terephthalate. Polyethylene terephthalate (PET) resin produced through transesterification, polymerization, and cooling / drying processes with addition of products, etc., and polymerized and solidified through addition and condensation reaction processes, including water and various additives in caprolactam The Nylon (polyamide) resin is a thermoplastic resin having a relatively lower viscosity than PVC.
[0008]
[Problems to be solved by the invention]
However, low-viscosity thermoplastics such as PET and Nylon resins that are extruded through the extrusion process do not have a shear rate that requires melt viscosity, so extrusion for the production of tubular tubes or pipes is the current extrusion. Depending on the molding method, there is a problem that molding is impossible.
[0009]
Therefore, an object of the present invention is to provide a cooling device for rapidly cooling a low-viscosity resin extruded through an extrusion process into a tube having a desired diameter and thickness.
[0010]
[Means for Solving the Problems]
(1) In order to achieve such an object, the present invention provides at least one of adjusting the outer diameter of the tube by rapidly cooling the molten thermoplastic resin extruded from the extrusion table by contact with cooling water while vertically penetrating the molten thermoplastic resin. A cooling table, a vacuum table for maintaining the outer diameter of the tube by a vacuum suction pressure while penetrating a tubular tube guided through the cooling table downward, and maintaining a predetermined temperature A water tank for storing the water to be cooled and allowing the tube guided from the vacuum table to be cooled again while passing, and a take-off roller for pulling and transferring the unstretched tubular tube guided into the water tank at a constant speed It is characterized by comprising.
[0011]
(2) The cooling table has a shape with a stepped inner diameter portion, and a concave groove that is opened upward is formed between the inner diameter surface and the outer diameter surface, and a vertical rod is supported through the outer peripheral edge portion. A base body, a sleeve ring and a porous ring that are stacked on an inner diameter portion having a step of the base body, and a porous ring that is stacked on the upper side of the inner diameter portion of the base body has an outer peripheral edge portion on the upper side. The cooling device for manufacturing a heat-shrinkable tube using the thermoplastic resin according to (1), wherein each of the vertical bars is fixed by a clamp that is supported at one end.
[0012]
(3) Cooling water having a water temperature of 5 to 60 ° C. flows into the groove that opens upward at a rate of 7 to 50 l / min. Heat shrinkage using the thermoplastic resin according to (2) Cooling device for the manufacture of tubes.
[0013]
(4) The sleeve ring and the porous ring have inner diameters determined in accordance with the outer diameter of the tube, and the dimensions thereof are determined for manufacturing a heat-shrinkable tube using a thermoplastic resin according to (2) Cooling system.
[0014]
(5) The vacuum table has a shape having a step while vertically passing through the center, and a base body to which a vacuum pressure is supplied to the upper part of the inner diameter part so that the inner diameter is expanded more than the lower part. A cooling device for manufacturing a heat-shrinkable tube using a thermoplastic resin according to (1), characterized by comprising a sleeve ring and a porous ring that are fitted into an upper inner diameter portion that is opened upward .
[0015]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
[0016]
As shown in FIG. 1, the present invention is mainly composed of a cooling table 10, a vacuum table 20, a
[0017]
The cooling table 10 is configured to rapidly cool the melt so that a low-viscosity and high-temperature molten resin extruded by free fall from an upper extrusion table (not shown) passes through while passing vertically. Cooling water having a predetermined temperature is supplied, and the tubular tube is stably maintained by forming a water film simultaneously with cooling while the cooling water contacts the outer diameter surface of the melt passing vertically through the cooling table 10 It is.
[0018]
At this time, it is most preferable that at least one cooling table 10 is provided at a predetermined interval and is cooled by a sequential sequential cooling method.
[0019]
On the other hand, as shown in FIG. 2, the cooling table 10 has a shape in which the inner diameter portion has a step, and a
[0020]
A
[0021]
At this time, the inner side wall formed on the inside of the
[0022]
On the other hand, the
[0023]
The
[0024]
Such a cooling table 10 is a sequential cooling system in which one or more are provided in multiple stages as described above, and the distance between the cooling tables 10 is also determined according to the standard of the tube to be formed. To do.
[0025]
Thus, a vacuum table 20 is provided immediately below the cooling table 10 provided in multiple stages.
[0026]
The vacuum table 20 maintains the melt in a tubular shape by the suction pressure of the vacuum while passing the tube guided through the cooling table 10 vertically again.
[0027]
As shown in FIG. 3, the vacuum table 20 includes a
[0028]
Then, like the cooling table 10, the cooling water is continuously supplied to the
[0029]
On the other hand, the upper multistage cooling table 10 and the vacuum table 20 are simultaneously supported by a
[0030]
The
[0031]
The take-off
[0032]
At this time, if the melt is immersed in the
[0033]
The melt drawn out by winding the take-off
[0034]
The operation of the present invention having such a configuration will be described in detail. In the extrusion process, the melt is drawn to a low viscosity state with a viscosity of about 0.5-1.0 dl / g and a temperature of about 150-330 ° C.
[0035]
Such a low-viscosity melt is cooled by a sequential cooling method while passing through a cooling table 10 provided in multiple stages.
[0036]
At this time, the outer diameter of the unstretched tube made of low-viscosity resin is determined by the inner diameter of the
[0037]
That is, when the cooling water is continuously supplied to the
[0038]
The tubes that are sequentially cooled sequentially through the multi-stage cooling table 10 pass through the vacuum table 20 again. At this time, the tubes passing through the vacuum table 20 are cooled by the cooling water in the same manner as the cooling table 10.
[0039]
Whether or not the outer diameter of the tube guided from the cooling table 10 is maintained as it is by closely adhering the outer diameter of the tube to the inner hole inner diameter of the
[0040]
Such an action fixes the outer diameter of the tube to the inner diameter of the vacuum table 20, so that an unstretched tube having a desired thickness and outer diameter is formed.
[0041]
On the other hand, the unstretched tube whose outer diameter is fixed by the vacuum pressure in the vacuum table 20 passes through the water in the
[0042]
Thus, in the present invention, when rapidly cooling the low-viscosity resin discharged from the extrusion table, it is cooled by a multistage sequential cooling system to prevent deformation due to water pressure, and a solid state having a constant thickness and outer diameter. The characteristic is to obtain a tubular tube.
[0043]
The resin at this time can be all polyester and polyamide.
[0044]
【Example】
EXAMPLES Hereinafter, although this invention is demonstrated based on an Example, this invention is not limited to an Example.
[0045]
As an example of a tube in the present invention, a thermoplastic polyester-based resin is dried to a moisture content of 100 ppm or less with a dryer, mixed with appropriate amounts of additives and pigments, put into a hopper, and melted at an extruder cylinder temperature of 220 to 290 ° C. And pushed through a circular platform. The high-temperature, low-viscosity resin extruded from the extrusion table makes contact with 30 ° C cooling water at a rate of 30 l / min while vertically passing through the two cooling tables 10 having a sleeve ring and a porous ring size of φ20 mm. Therefore, the outer diameter of the tube was adjusted at the same time that the low-viscosity resin was solidified while being rapidly cooled. The tubular tube guided through the cooling table 10 is maintained at 30 ° C. while passing through the
[0046]
When such an unstretched tube is preheated to 75 ° C and then stretched to a stretching temperature of 100 ° C and cooled to a cooling temperature of 18 ° C with a φ19 mm stretched tube, the major axis length is finally 30 mm and the minor axis length. Of 100 μm, width shrinkage 45%, and long shrinkage 7%.
[0047]
On the other hand, Table 1 shows another example in which the water tank, the cooling water temperature, and the cooling water amount were changed together with the above examples, and the changes in processing characteristics and physical properties at that time were checked.
[0048]
The processing characteristics of the tube manufactured in this way indicate the workability that allows normal operation, especially when such a tube product is viewed with the naked eye, and the surface shape shows a state in which the length of the long axis is constant without irregularities. It has.
[0049]
In particular, when the manufactured shrinkable tube products are cut into 100mm lengths, opened on both sides, and deposited in 98 ± 2 ℃ boiling water for 30 seconds, the shape of the cut surface is confirmed with the naked eye. It can be seen that the shape of the cut surface maintains the original state.
[0050]
[Table 1]
[0051]
【The invention's effect】
As described above, in providing a heat-shrinkable tube according to the present invention, a low-viscosity and high-temperature unstretched tube is rapidly cooled by a sequential cooling method so as to become a solid state and prevent deformation due to water pressure to be uniform. There is an effect that an unstretched tube having a shape having a thickness and a desired outer diameter can be manufactured. Further, since the cooling and formation of a predetermined size are performed by passing through a water-permeable ring (porous ring) for water cooling, it is efficient. Furthermore, both the porous ring for cooling and the sleeve ring for sizing can be easily removed by clamping, so that it can be flexibly adapted to the tube to be manufactured. At the same time, it is easy to assemble the device and replace the parts, and it is easy to maintain.
[Brief description of the drawings]
FIG. 1 is a structural diagram of a cooling device according to the present invention.
FIG. 2 is a sectional view showing a cooling table of the present invention.
FIG. 3 is a cross-sectional view showing a vacuum table of the present invention.
[Explanation of symbols]
10 Cooling table
11 units
12 Sleeve ring
13 Porous ring
14 Clamp
15 Inner diameter
15a Step
16s inner surface
16t outer diameter surface
20 Vacuum table
21 units
22 Solid ring
23 Porous ring
30 aquarium
40 take-off roller
Claims (5)
前記冷却台を貫通して誘導される管状のチューブを下向きに貫通させるようにしながら真空の吸入圧によりメルトの外径が維持されるようにする真空台と、
所定温度に維持される水を貯蔵し、前記真空台から誘導されるチューブが通過しながら再度冷却されるようにする水槽と、
前記水槽内に誘導される未延伸管状チューブを一定速度で引っ張って移送させるテークオフローラーと、を備え、
前記冷却台は内径部が段差をもつ形状で、内径面と外径面の間には上向き開放される凹溝が形成されたものであり、
前記真空台及び前記水槽は前記冷却台の下方に配置されることを特徴とする熱可塑性樹脂を用いた熱収縮チューブの製造のための冷却装置。A cooling table in which one or more are vertically equipped to adjust the outer diameter of the tube so as to be rapidly cooled by contact with cooling water while vertically penetrating the thermoplastic resin extruded from the extrusion table;
A vacuum table for maintaining the outer diameter of the melt by the suction pressure of the vacuum while penetrating downward the tubular tube guided through the cooling table;
A water tank for storing water maintained at a predetermined temperature and cooling again while passing a tube derived from the vacuum table;
A take-off roller for pulling and transferring the unstretched tubular tube guided into the water tank at a constant speed ,
The cooling table has a shape in which the inner diameter portion has a step, and a concave groove that is opened upward is formed between the inner diameter surface and the outer diameter surface.
The cooling device for manufacturing a heat-shrinkable tube using a thermoplastic resin, wherein the vacuum table and the water tank are disposed below the cooling table .
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KR1020000063889A KR100357666B1 (en) | 2000-10-30 | 2000-10-30 | Cooling apparatus for manufacturing of heat shrinkable tubes using thermoplastic resin |
KR2000-63889 | 2000-10-30 |
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JP2002160294A JP2002160294A (en) | 2002-06-04 |
JP3891822B2 true JP3891822B2 (en) | 2007-03-14 |
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KR860002596Y1 (en) * | 1985-03-30 | 1986-10-08 | 금성전선주식회사 | Card's sliver irregular's inspecting apparatus |
KR870002932A (en) * | 1985-09-06 | 1987-04-14 | 이상섭 | Polyester Tube Forming Equipment |
JPH0225317A (en) * | 1988-07-15 | 1990-01-26 | Fujikura Ltd | Manufacture of heat-shrinkable tubing |
JP3152961B2 (en) * | 1991-07-08 | 2001-04-03 | 株式会社興人 | Cooling mandrel |
KR0142803B1 (en) * | 1993-09-02 | 1998-07-15 | 모리시다 요이치 | Signal processor |
-
2000
- 2000-10-30 KR KR1020000063889A patent/KR100357666B1/en active IP Right Grant
-
2001
- 2001-10-30 CN CNB01136856XA patent/CN1189308C/en not_active Expired - Lifetime
- 2001-10-30 JP JP2001332577A patent/JP3891822B2/en not_active Expired - Lifetime
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR100925249B1 (en) | 2007-12-17 | 2009-11-05 | 이붕걸 | Medical port tube for extrusion molding device and process for producing the same |
KR102055285B1 (en) * | 2019-06-21 | 2019-12-12 | 황희주 | Extruding-forming apparatus to improve cooling efficiency |
Also Published As
Publication number | Publication date |
---|---|
CN1189308C (en) | 2005-02-16 |
JP2002160294A (en) | 2002-06-04 |
CN1350916A (en) | 2002-05-29 |
KR100357666B1 (en) | 2002-10-25 |
KR20020033264A (en) | 2002-05-06 |
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