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JP3816201B2 - Resin supply crosshead - Google Patents
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JP3816201B2 - Resin supply crosshead - Google Patents

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Publication number
JP3816201B2
JP3816201B2 JP21100797A JP21100797A JP3816201B2 JP 3816201 B2 JP3816201 B2 JP 3816201B2 JP 21100797 A JP21100797 A JP 21100797A JP 21100797 A JP21100797 A JP 21100797A JP 3816201 B2 JP3816201 B2 JP 3816201B2
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Japan
Prior art keywords
crosshead
molten resin
resin
breaker unit
main body
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Expired - Fee Related
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JP21100797A
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Japanese (ja)
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JPH1148307A (en
Inventor
浩央 杉山
勝則 深野
良一 渡辺
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Sumitomo Heavy Industries Modern Ltd
Zacros Corp
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Fujimori Kogyo Co Ltd
Sumitomo Heavy Industries Modern Ltd
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Priority to JP21100797A priority Critical patent/JP3816201B2/en
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    • 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
    • B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
    • B29C48/395—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die using screws surrounded by a cooperating barrel, e.g. single screw extruders
    • 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
    • B29C48/07—Flat, e.g. panels
    • B29C48/08—Flat, e.g. panels flexible, e.g. films
    • 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
    • B29C48/30—Extrusion nozzles or dies
    • B29C48/305—Extrusion nozzles or dies having a wide opening, e.g. for forming sheets
    • 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
    • B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
    • B29C48/362—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die using static mixing devices

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)

Description

【０００１】
【発明の属する技術分野】
本発明は、例えば押出ラミネート等に用いられる押出成形機のダイに溶融樹脂を供給する樹脂供給用クロスヘッドに関する。
【０００２】
【従来の技術】
押出ラミネートによるシート状物品の製造に際しては、例えば図４に示すような装置が使用される。図中符号１は押出機の加熱筒で、この加熱筒１の後端には、クロスヘッド（樹脂供給用クロスヘッド）２が連結され、かつクロスヘッド２から下方に延びるジョイント３の下端には、ダイ４が水平に延設されている。加熱筒１にて加熱溶融された樹脂は、クロスヘッド２及びジョイント３を経てダイ４に供給され、ダイ４の下端に形成されたリップ部５から、樹脂フィルム６として押し出される。
【０００３】
また、符号７，８はそれぞれ冷却ロール及びゴムロールで、これらのロール７，８は、その側面同士がダイ４の下方にて接触するよう配設され、かつ図示しない駆動源により、図中矢印Ｒ1，Ｒ2方向にそれぞれ回転可能とされている。樹脂フィルム６は、これらロール７，８の回転に伴い、紙やアルミニウム製の基材９とともにロール７，８間に導入され、ロール７，８間における樹脂フィルム６の基材９への圧着により、樹脂フィルム６と基材９とを一体的に積層してなるラミネートフィルム１０が製造される。
【０００４】
上記クロスヘッド２の構造を図５に示す。図中符号２１はクロスヘッド２の本体で、この本体２１は円筒状をなし、かつその先端（図中左端）にて、加熱筒１の後端に連結されている。また、符号２２は、本体２１の内部に形成された空間で、この空間２２の先端は本体２１の先端面に開口し、溶融樹脂の入口２３を形成している。この入口２３は、加熱筒１内に形成された流路１１に同軸をなすよう連結され、流路１１内に設置されたスクリュ１２の回転により、溶融樹脂が流路１１から入口２３を介して空間２２内に流入するようになっている。
【０００５】
一方、空間２２の先端部は後端側に向け暫時拡径され、かつ空間２２内は、本体２１と同軸をなすよう配設された、溶融樹脂が通過可能な円筒状の支持筒（図示せず。）及びこの支持筒に支持されたスクリーン２４により、入口２３と連通する内室２２ａと、外室２２ｂとに分割されている。また、符号２５は、内室２２ａに、本体２１の後端から先端側に向け、本体２１と同軸をなすよう設置されたニードルバルブで、その先端は、図示のように、空間２２の先端部にて、先端に向け凸なる円錐状をなしている。
【０００６】
符号２６は、本体２１の後端部にて本体２１の下方側面に形成された出口で、外室２２ｂは、この出口２６を介して、本体２１の側面に連結されたジョイント３の流路３１に連結されている。流路１１から入口２３を介して内室２２ａ内に流入した溶融樹脂は、ニードルバルブ２５の先端に沿って本体２１の径方向外方に偏向され、支持筒及びスクリーン２４を通過して外室２２ｂに流入する。外室２２ｂに流入した溶融樹脂は、更に出口２６及び流路３１を介して、ダイ４へと供給される。
【０００７】
【発明が解決しようとする課題】
ところで、上記従来のクロスヘッド２では、出口２６が本体２１の後端部にて本体２１の下方側面に形成されている。そのため、図５中矢印Ｆ1で示すように空間２２の上方側を通過する溶融樹脂（以下、便宜的に樹脂Ａとする。）と、図５中矢印Ｆ2で示すように空間２２の下方側を通過する溶融樹脂（以下、便宜的に樹脂Ｂとする。）とでは、樹脂Ａの方が、空間２２内における滞留時間が長くなる。
【０００８】
その結果、上記従来のクロスヘッド２では、出口２６から流路３１に流入する溶融樹脂のうち、流路３１の後端部に流入する樹脂（主に樹脂Ａが流入する。）と流路３１の先端部に流入する樹脂（主に樹脂Ｂが流入する。）との間に温度差が生じてしまう。そこで、上記従来のクロスヘッド２では、この温度差を解消するため、流路３１内に撹拌器を設けたり、ダイ４の温度やリップ部５の間隔を微妙に調節する等の対策を講じている。しかしながら、撹拌器の設置は装置の複雑化や樹脂パージ時におけるパージ性低下の原因となり、また、溶融樹脂の温度差に対応してダイ４の温度やリップ部５の間隔を微妙に調節することは、極めて煩雑な作業である。
【０００９】
一方、上記従来のクロスヘッド２では、溶融樹脂の背圧を、ニードルバルブ２５の本体２１の軸方向に沿った移動に伴う入口２３の開口量調節により制御している。しかしながら、背圧を上げるためにニードルバルブ２５を本体２１の先端側に接近させた場合には、ニードルバルブ２５による溶融樹脂の本体２１の径方向外方への偏向が強められ、樹脂Ａと樹脂Ｂとの間における溶融樹脂の温度差が結果的に大きくなるという問題もある。本発明は上記事情に鑑みてなされたもので、クロスヘッドの出口からジョイントに流入する溶融樹脂の温度差の解消をその目的としている。
【００１０】
【課題を解決するための手段】
本発明は、径方向に沿って複数の細孔が形成されて溶融樹脂が通過可能な円筒状の支持筒及びこの支持筒に支持されたスクリーンを備える円筒状のブレーカユニットの前記スクリーンによりその内部が内外２室に分割される円筒状のクロスヘッド本体と、該クロスヘッド本体の内部に形成された空間を暫時縮径させた後拡径させて前記クロスヘッド本体を加熱筒の後端に連結するライナーと、前記ブレーカユニットの後端側に設置されて溶融樹脂の進路を下方に転換させる流路を備えるブロックと、を有する押出成形機のダイに溶融樹脂を供給する樹脂供給用クロスヘッドであって、前記ブレーカユニットの前記支持筒が前記ライナーに挿入され、前記ライナーの縮径部に形成された前記溶融樹脂の入口が前記２室のうち外室に、前記ブレーカユニットの後端に形成された前記溶融樹脂の出口が前記２室のうち内室に、それぞれ前記クロスヘッド本体と同軸をなすよう設けられて連通されているとともに、前記クロスヘッド本体が内部に流路を備えるジョイントを介して前記加熱筒の下方において該加熱筒と略同一方向かつ水平に延設されるように前記ダイを吊して支持することをその特徴としている。
【００１１】
ここで、前記溶融樹脂の出口から前記ダイとの間に、前記溶融樹脂の背圧を調節する調節手段が設けられていることが望ましい。
【００１３】
更に望ましくは、前記ブレーカユニットは、前記クロスヘッド本体の内室側に、円錐状をなすコーンを、前記クロスヘッド本体の先端側から後端に向け、前記クロスヘッド本体と同軸をなすよう設置する。
【００１４】
一方、前記ブレーカユニットの前記支持筒の先端面にプレート状をなすスクリーンを設置し、前記溶融樹脂の入口を、このスクリーンを介して前記内室に連通させることも可能である。
本発明の樹脂供給用クロスヘッドは、押出ラミネート装置に用いられるものとすることができる。
【００１５】
【発明の実施の形態】
以下、図面に基づき、本発明の実施形態について更に詳しく説明する。なお、上記図４及び図５に示したものと同様の構成を有する部分については、図４及び図５と同一の符号を付してその説明を省略する。
【００１６】
本発明に係るクロスヘッド２００の構造を図１ないし図３に示す。図中符号２０１はクロスヘッド２００の本体で、このクロスヘッド本体２０１は円筒状をなし、かつその先端（図中左端）部には、クロスヘッド本体２０１の内部に形成された空間２０２を先端側に向け暫時縮径させた後拡径させるライナー２０３が嵌合されている。その結果、このクロスヘッド２００では、ライナー２０３における縮径部が、クロスヘッド２００における溶融樹脂の入口２０４となっている。
【００１７】
クロスヘッド本体２０１は、加熱筒１の後端に、加熱筒１と同軸をなすよう連結され、かつ加熱筒１への連結に伴い、溶融樹脂の入口２０４が、加熱筒１内に形成された流路１１に同軸をなすよう連結される。そして、流路１１内に設置されたスクリュ１２の回転により、溶融樹脂が流路１１から溶融樹脂の入口２０４を介して空間２０２内に流入するようになっている。また、符号２０５は加熱筒１及びクロスヘッド本体２０１の周囲に環装され、加熱筒１とクロスヘッド本体２０１とを連結するカラーである。
【００１８】
符号２０６は、空間２０２内に、後端側から同軸をなすよう挿入されたブレーカユニットで、このブレーカユニット２０６は、円筒状をなし、かつその先端部には、空間２０２より若干小径とされた支持筒２０７が形成され、空間２０２は、この支持筒２０７により、内室２０２ａと、溶融樹脂の入口２０４と連通する外室２０２ｂとに分割されている。また、この支持筒２０７には、径方向に沿って複数の細孔が形成され、この細孔を介して、溶融樹脂が支持筒２０７を通過可能となっている。更に、支持筒２０７の表面には、溶融樹脂が通過可能なスクリーン２０８が支持されている。
【００１９】
符号２０９は、ブレーカユニット２０６の先端に形成されたコーン先端部で、このコーン先端部２０９は、先端に向け凸なる円錐状をなし、かつコーン先端部２０９の先端は、ライナー２０３内に、所定幅の隙間Ｓを介して同軸をなすよう挿入されている。また、符号２１０は、コーン先端部２０９の後端面から、内室２０２ａに、クロスヘッド本体２０１の後端に向け、クロスヘッド本体２０１と同軸をなすよう設置されたコーン後端部（コーン）で、このコーン後端部２１０は、クロスヘッド本体２０１の他端に向け暫時縮径する円筒状をなし、かつその先端は、内室２０２ａの後端部にて、後端に向け凸なる円錐状をなしている。
【００２０】
一方、ブレーカユニット２０６の後端部は拡径されて空間２０２を閉鎖し、かつ、ブレーカユニット２０６の後端中央部には、内室２０２ａと連通する溶融樹脂の出口２１１が、クロスヘッド本体２０１と同軸をなすよう設けられている。また、符号２１２は、ブレーカユニット２０６の後端側に設置されたブロックで、溶融樹脂の出口２１１は、このブロック２１２及びクロスヘッド本体２０１の下方側面に形成された流路２１３，２１４を介して、クロスヘッド本体２０１の側面に連結されたジョイント３００の流路３０１に連通されている。
【００２１】
更に、符号２１５は、ブレーカユニット２０６及びブロック２１２をクロスヘッド本体２０１内の所定位置に支持する押え板、符号２１６は、ジョイント３００の周囲に環装され、クロスヘッド本体２０１とジョイント３００とを連結するカラーである。
【００２２】
また、図２に示すように、ジョイント３００には、溶融樹脂の出口２１１から流路３０１に流入した溶融樹脂の背圧を調節する調節手段３０２が設けられている。この調節手段は、ジョイント３００内に、流路３０１の側面に下向きに開口するよう傾斜して設けられた凹部３０３と、この凹部３０３内に、その傾斜方向に沿って摺動自在に設けられ、かつ流路３０１に臨む面が、流路３０１の側面と平行とされたスリットプレート３０４と、スリットプレート３０４の底面からスリットプレート３０４の傾斜方向と平行に延び、更にジョイント３００の側面から外方に突出するシャフト３０５とから概略構成されている。
【００２３】
シャフト３０５を回転させると、スリットプレート３０４が凹部３０３の傾斜方向に沿って図中矢印Ｍで示すように摺動する。すなわち、この調節手段３０２では、シャフト３０５を回転させて流路３０１の側面からのスリットプレート３０４の突出量を調節して流路３０１の幅を変えることにより、溶融樹脂の局部発熱を発生させることなく、流路３０１に流入した溶融樹脂のダイへの背圧を調節している。
【００２４】
更に、このジョイント３００では、図中符号Ｐで示すように、凹部３０３の下端側の側面が流路３０１の側面と同一面となるよう流路３０１を屈曲させている。これは、スリットプレート３０４を流路３０１の側面から突出させた際におけるスリットプレート３０４の下面と流路３０１の側面による鋭角部の形成と、この鋭角部における樹脂の滞留を防止するためである。
【００２５】
また、符号３０６は、凹部３０３へのシャフト３０５の挿入量（すなわち流路３０１の側面からのスリットプレート３０４の突出量）を示す目盛板、符号３０７は、シャフト３０５に固定され、シャフト３０５の挿入量を目盛板３０６上に指す指示器である。一方、符号３０８は、ダイ（図示せず。）固定用のプレートである。
【００２６】
流路１１から溶融樹脂の入口２０４を介して空間２０２内に流入した溶融樹脂は、コーン先端部２０９によりクロスヘッド本体２０１の径方向外方に偏向されて外室２０２ｂに至り、更にスクリーン２０８及び支持筒２０７を通過して内室２０２ａに流入する。内室２０２ａに流入した溶融樹脂は、コーン後端部２１０に沿って後端側へと移動し、溶融樹脂の出口２１１及び流路２１３，２１４，３０１を介して、ダイへと供給される。
【００２７】
特に、このクロスヘッド２００の場合、円筒状をなすクロスヘッド本体２０１の前部及び後部に、前記溶融樹脂の入口２０４と前記溶融樹脂の出口２１１とが、それぞれクロスヘッド本体２０１と同軸をなすよう設けられ、かつブレーカユニット２０６もクロスヘッド本体２０１と同軸をなすよう設けられている。そのため、例えば図中矢印Ｆ3，Ｆ4で示すように、空間２０２のどの側を通過する溶融樹脂でも、空間２０２内における滞留時間がほぼ一定となる。従って、溶融樹脂の出口２１１から流路２１３に流入する溶融樹脂の温度が均一化され、その結果、ジョイント内に撹拌器を設けたり、ダイの温度やリップ部の間隔を微妙に調節する等の対策が必要であった上記従来のクロスヘッド２に比して、樹脂パージ時におけるパージ性及び溶融樹脂の温度調節における作業性が向上する。
【００２８】
また、溶融樹脂の背圧を調節する機構を、調節手段３０２のような構成としたため、従来ニードルバルブによる背圧調整により発生していた樹脂の局部発熱がなく、溶融樹脂の温度ムラが生じにくい。更に、溶融樹脂が、内室２０２ａに、クロスヘッド本体２０１と同軸をなすよう設置された先細り形状のコーン後端部２１０に沿って均一に溶融樹脂の出口２１１へと導入されるため、溶融樹脂の出口２１１における溶融樹脂の滞留ムラが生じにくくなり、樹脂の劣化（炭化）が少なくなるという効果がある。
【００２９】
なお、上記のクロスヘッド２００では、円錐状のコーン先端部２０９を用いたが、このコーン先端部２０９に換え、図３に示すような、支持筒２０７の先端面に細孔２１７を設け、その細孔２１７を、溶融樹脂が通過可能なスクリーン２１８で先端側から覆ったものを、ブレーカユニットとして用いてもよい。この場合には、支持筒２０７の側面のみならず、この細孔２１７からも、内室２０２ａへと溶融樹脂が流入する。
【００３０】
【発明の効果】
以上説明した通り、本発明の樹脂供給用クロスヘッドは、径方向に沿って複数の細孔が形成されて溶融樹脂が通過可能な円筒状の支持筒及びこの支持筒に支持されたスクリーンを備える円筒状のブレーカユニットの前記スクリーンによりその内部が内外２室に分割される円筒状のクロスヘッド本体と、該クロスヘッド本体の内部に形成された空間を暫時縮径させた後拡径させて前記クロスヘッド本体を加熱筒の後端に連結するライナーと、前記ブレーカユニットの後端側に設置されて溶融樹脂の進路を下方に転換させる流路を備えるブロックと、を有する押出成形機のダイに溶融樹脂を供給する樹脂供給用クロスヘッドであって、前記ブレーカユニットの前記支持筒が前記ライナーに挿入され、前記ライナーの縮径部に形成された前記溶融樹脂の入口が前記２室のうち外室に、前記ブレーカユニットの後端に形成された前記溶融樹脂の出口が前記２室のうち内室に、それぞれ前記クロスヘッド本体と同軸をなすよう設けられて連通されているとともに、前記クロスヘッド本体が内部に流路を備えるジョイントを介して前記加熱筒の下方において該加熱筒と略同一方向かつ水平に延設されるように前記ダイを吊して支持することを特徴としている。そのため、クロスヘッド本体内を通過する溶融樹脂の間で、クロスヘッド本体内における滞留時間の差がなく、溶融樹脂の出口からダイに供給される溶融樹脂の温度が均一化される。従って、ジョイント内に撹拌器を設けたり、ダイの温度やリップ部の間隔を微妙に調節する等の対策が必要であった上記従来のクロスヘッドに比して、樹脂パージ時におけるパージ性及び溶融樹脂の温度調節における作業性が向上する。
【００３１】
また、溶融樹脂の背圧を調節する調節手段を溶融樹脂の出口とダイとの間に設けた場合には、溶融樹脂の背圧調節時における溶融樹脂の局部発熱が防止される。
【００３２】
更に、ブレーカユニットは、クロスヘッド本体の内室側に、円錐状をなすコーンが、クロスヘッド本体の先端側から後端に向け、前記クロスヘッド本体と同軸をなすよう設置されている場合には、溶融樹脂がコーンに沿って均一に溶融樹脂の出口へと導入されるため、溶融樹脂の出口における溶融樹脂の滞留ムラが生じにくくなり、樹脂の劣化（炭化）が少なくなる。
【図面の簡単な説明】
【図１】 本発明のクロスヘッドの構造の例を示す図２のＩ−Ｉ線に沿った断面図である。
【図２】 本発明のクロスヘッドに係る調節手段の構造の例を示す図１の矢印ＩＩより見たクロスヘッドの一部断面図である。
【図３】 本発明のクロスヘッドに係るブレーカの構造の例を示すクロスヘッドの一部断面図である。
【図４】 シート状物品の製造装置の構造の例を示す上方斜視図である。
【図５】 従来のクロスヘッドの構造の例を示す断面図である。
【符号の説明】
１ 加熱筒
４ ダイ
２００ （樹脂供給用）クロスヘッド
２０１ クロスヘッド本体
２０２ クロスヘッド本体の内部に形成された空間
２０２ａ 内室
２０２ｂ 外室
２０３ ライナー
２０４ 溶融樹脂の入口
２０６ ブレーカユニット
２０７ 支持筒
２０８，２１８ スクリーン
２０９ コーン先端部
２１０ コーン後端部（コーン）
２１１ 溶融樹脂の出口
２１２ ブロック
２１３ 流路
３００ ジョイント
３０２ 調節手段[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a resin-supplied crosshead for supplying a molten resin to a die of an extruder used for, for example, extrusion lamination.
[0002]
[Prior art]
When manufacturing a sheet-like article by extrusion lamination, for example, an apparatus as shown in FIG. 4 is used. In the figure, reference numeral 1 denotes a heating cylinder of an extruder. A crosshead (resin supply crosshead) 2 is connected to the rear end of the heating cylinder 1 and the lower end of a joint 3 extending downward from the crosshead 2 is connected to the lower end of the joint 3. The die 4 extends horizontally. The resin heated and melted in the heating cylinder 1 is supplied to the die 4 through the crosshead 2 and the joint 3 and is extruded as a resin film 6 from the lip portion 5 formed at the lower end of the die 4.
[0003]
Reference numerals 7 and 8 denote a cooling roll and a rubber roll, respectively. These rolls 7 and 8 are arranged so that the side surfaces thereof are in contact with each other below the die 4 and are driven by an arrow R in the figure by a driving source (not shown). 1 and R 2 directions can be rotated respectively. As the rolls 7 and 8 rotate, the resin film 6 is introduced between the rolls 7 and 8 together with the base material 9 made of paper or aluminum, and the resin film 6 is pressed onto the base material 9 between the rolls 7 and 8. Then, a laminate film 10 formed by integrally laminating the resin film 6 and the substrate 9 is manufactured.
[0004]
The structure of the crosshead 2 is shown in FIG. Reference numeral 21 in the figure denotes a main body of the crosshead 2, and the main body 21 has a cylindrical shape and is connected to the rear end of the heating cylinder 1 at the front end (left end in the figure). Reference numeral 22 denotes a space formed inside the main body 21, and the front end of the space 22 opens at the front end surface of the main body 21 to form an inlet 23 for molten resin. This inlet 23 is connected so as to be coaxial with the flow path 11 formed in the heating cylinder 1, and the molten resin is passed from the flow path 11 through the inlet 23 by the rotation of the screw 12 installed in the flow path 11. It flows into the space 22.
[0005]
On the other hand, the front end portion of the space 22 is gradually enlarged toward the rear end side, and the inside of the space 22 is disposed so as to be coaxial with the main body 21 and is a cylindrical support tube (not shown) through which molten resin can pass. And the screen 24 supported by the support cylinder is divided into an inner chamber 22a communicating with the inlet 23 and an outer chamber 22b. Reference numeral 25 denotes a needle valve installed in the inner chamber 22a from the rear end to the front end side of the main body 21 so as to be coaxial with the main body 21, and the front end thereof is a front end portion of the space 22 as shown in the figure. In, it has a conical shape convex toward the tip.
[0006]
Reference numeral 26 denotes an outlet formed on the lower side surface of the main body 21 at the rear end portion of the main body 21, and the outer chamber 22 b is a flow path 31 of the joint 3 connected to the side surface of the main body 21 through the outlet 26. It is connected to. The molten resin that has flowed into the inner chamber 22 a from the flow path 11 through the inlet 23 is deflected radially outward of the main body 21 along the tip of the needle valve 25, passes through the support cylinder and the screen 24, and passes through the outer chamber. It flows into 22b. The molten resin flowing into the outer chamber 22 b is further supplied to the die 4 through the outlet 26 and the flow path 31.
[0007]
[Problems to be solved by the invention]
Incidentally, in the conventional crosshead 2, the outlet 26 is formed on the lower side surface of the main body 21 at the rear end portion of the main body 21. Therefore, the molten resin (hereinafter, conveniently referred to as Resin A.) Which passes over the side of the space 22 as shown in Figure 5 in the arrow F 1 and the lower space 22, as shown in Figure 5 in an arrow F 2 With a molten resin passing through the side (hereinafter referred to as resin B for convenience), the resin A has a longer residence time in the space 22.
[0008]
As a result, in the conventional crosshead 2, out of the molten resin that flows into the flow path 31 from the outlet 26, the resin that flows into the rear end portion of the flow path 31 (mainly the resin A flows in) and the flow path 31. Temperature difference occurs between the resin flowing into the tip of the resin (mainly resin B flows in). Therefore, in order to eliminate this temperature difference, the conventional crosshead 2 takes measures such as providing a stirrer in the flow path 31 and finely adjusting the temperature of the die 4 and the interval between the lip portions 5. Yes. However, the installation of the stirrer causes the complexity of the apparatus and the purgeability at the time of the resin purge, and the temperature of the die 4 and the interval between the lip portions 5 are finely adjusted according to the temperature difference of the molten resin. Is an extremely complicated task.
[0009]
On the other hand, in the conventional crosshead 2, the back pressure of the molten resin is controlled by adjusting the opening amount of the inlet 23 accompanying the movement of the needle valve 25 along the axial direction of the main body 21. However, when the needle valve 25 is moved closer to the distal end side of the main body 21 in order to increase the back pressure, the deflection of the molten resin in the radial direction of the main body 21 by the needle valve 25 is strengthened, and the resin A and the resin There is also a problem that the temperature difference between the molten resin and B increases as a result. The present invention has been made in view of the above circumstances, and an object thereof is to eliminate the temperature difference of the molten resin flowing into the joint from the outlet of the crosshead.
[0010]
[Means for Solving the Problems]
The present invention provides a cylindrical support cylinder in which a plurality of pores are formed along the radial direction and through which a molten resin can pass, and a cylindrical breaker unit including a screen supported by the support cylinder. A cylindrical crosshead body divided into two chambers inside and outside, and a space formed inside the crosshead body is temporarily reduced in diameter and then expanded to connect the crosshead body to the rear end of the heating cylinder A resin supply crosshead for supplying molten resin to a die of an extrusion molding machine having a liner and a block provided on a rear end side of the breaker unit and provided with a flow path for changing the path of the molten resin downward there are, said support tube of the breaker unit is inserted into the liner, the inner outside chamber of the inlet of the molten resin formed in the reduced diameter portion of the liner the two chambers, said blade In out the chamber outlet of the molten resin which is formed at the rear end of the two chambers of the units, provided that each forms the crosshead body coaxial with and communicates, the crosshead body fluid therein It is characterized in that the die is suspended and supported so as to extend substantially in the same direction and horizontally as the heating cylinder below the heating cylinder via a joint provided with a path .
[0011]
Here, it is preferable that an adjusting means for adjusting a back pressure of the molten resin is provided between the outlet of the molten resin and the die.
[0013]
Further preferably, the breaker unit, the inner chamber side of the crosshead body, a cone forming the conical toward the rear from the front end side of the crosshead body is placed so as to form the cross-head body coaxial .
[0014]
On the other hand, it is also possible to install a plate-shaped screen on the front end surface of the support cylinder of the breaker unit, and to connect the molten resin inlet to the inner chamber through the screen.
The resin supply crosshead of the present invention can be used in an extrusion laminating apparatus.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in more detail with reference to the drawings. Note that portions having the same configurations as those shown in FIGS. 4 and 5 are given the same reference numerals as those in FIGS. 4 and 5 and description thereof is omitted.
[0016]
The structure of a crosshead 200 according to the present invention is shown in FIGS. In the figure, reference numeral 201 denotes a main body of the crosshead 200. The crosshead main body 201 has a cylindrical shape, and a space 202 formed inside the crosshead main body 201 is provided at the front end side (left end in the figure). A liner 203 for reducing the diameter for a while and then expanding the diameter is fitted. As a result, in the cross head 200, the reduced diameter portion of the liner 203 serves as the molten resin inlet 204 in the cross head 200.
[0017]
The crosshead body 201 is connected to the rear end of the heating cylinder 1 so as to be coaxial with the heating cylinder 1, and an inlet 204 of molten resin is formed in the heating cylinder 1 in connection with the connection to the heating cylinder 1. It is connected to the flow path 11 so as to be coaxial. The molten resin flows from the flow path 11 into the space 202 through the molten resin inlet 204 by the rotation of the screw 12 installed in the flow path 11. Further, reference numeral 205 is mounted around the periphery of the heating cylinder 1 and the cross head body 201, a collar connecting the heating cylinder 1 and the cross head body 201.
[0018]
Reference numeral 206 denotes a breaker unit inserted into the space 202 so as to be coaxial from the rear end side. The breaker unit 206 has a cylindrical shape and has a slightly smaller diameter at the front end portion than the space 202. A support cylinder 207 is formed, and the space 202 is divided into an inner chamber 202 a and an outer chamber 202 b communicating with the molten resin inlet 204 by the support cylinder 207. The support cylinder 207 is formed with a plurality of pores along the radial direction, and the molten resin can pass through the support cylinder 207 through the pores. Further, a screen 208 through which the molten resin can pass is supported on the surface of the support cylinder 207.
[0019]
Reference numeral 209 denotes a cone tip formed at the tip of the breaker unit 206. The cone tip 209 has a conical shape that protrudes toward the tip, and the tip of the cone tip 209 is disposed in the liner 203 within a predetermined range. It is inserted so as to be coaxial through a gap S of width. Further, reference numeral 210, from the rear end face of the cone tip 209, the inner chamber 202a, toward the rear end of the crosshead body 201, a cone rear portion disposed so as to form a cross-head body 201 coaxially (corn) The cone rear end portion 210 has a cylindrical shape that is temporarily reduced in diameter toward the other end of the crosshead body 201, and the tip thereof is a conical shape that protrudes toward the rear end at the rear end portion of the inner chamber 202a. I am doing.
[0020]
On the other hand, the rear end of the breaker unit 206 is expanded to close the space 202, and the rear central portion of the breaker unit 206, the outlet 211 of the molten resin communicating with the inner chamber 202a, the cross head body 201 It is provided so as to be coaxial. Reference numeral 212 denotes a block installed on the rear end side of the breaker unit 206, and an outlet 211 of the molten resin passes through the block 212 and flow paths 213 and 214 formed on the lower side surface of the crosshead body 201. The flow path 301 of the joint 300 connected to the side surface of the crosshead body 201 is communicated.
[0021]
Further, reference numeral 215 denotes a pressing plate that supports the breaker unit 206 and the block 212 at a predetermined position in the crosshead main body 201, and reference numeral 216 is provided around the joint 300 to connect the crosshead main body 201 and the joint 300. Color.
[0022]
As shown in FIG. 2, the joint 300 is provided with an adjusting unit 302 that adjusts the back pressure of the molten resin flowing into the flow path 301 from the molten resin outlet 211. The adjusting means is provided in the joint 300 with a recess 303 provided so as to open downward on the side surface of the flow path 301, and in the recess 303 so as to be slidable along the inclination direction. The surface facing the flow path 301 is a slit plate 304 that is parallel to the side surface of the flow path 301, extends from the bottom surface of the slit plate 304 in parallel with the inclination direction of the slit plate 304, and further outwards from the side surface of the joint 300. It is roughly composed of a projecting shaft 305.
[0023]
When the shaft 305 is rotated, the slit plate 304 slides as indicated by an arrow M in the drawing along the inclination direction of the recess 303. That is, in the adjusting means 302, the shaft 305 is rotated to adjust the amount of protrusion of the slit plate 304 from the side surface of the flow path 301 to change the width of the flow path 301, thereby generating local heat generation of the molten resin. Instead, the back pressure of the molten resin flowing into the flow path 301 to the die is adjusted.
[0024]
Further, in this joint 300, the flow path 301 is bent so that the side surface on the lower end side of the recess 303 is flush with the side surface of the flow path 301, as indicated by the reference symbol P in the drawing. This is to prevent formation of an acute angle portion by the lower surface of the slit plate 304 and the side surface of the flow channel 301 when the slit plate 304 is protruded from the side surface of the flow channel 301, and to prevent the resin from staying in the acute angle portion.
[0025]
Reference numeral 306 denotes a scale plate indicating the amount of insertion of the shaft 305 into the recess 303 (that is, the amount of protrusion of the slit plate 304 from the side surface of the flow path 301). Reference numeral 307 is fixed to the shaft 305 and inserted into the shaft 305. An indicator pointing the amount on the scale plate 306. On the other hand, reference numeral 308 denotes a plate for fixing a die (not shown).
[0026]
The molten resin that has flowed into the space 202 from the flow path 11 through the molten resin inlet 204 is deflected radially outward of the crosshead main body 201 by the cone tip 209 to reach the outer chamber 202b. It passes through the support cylinder 207 and flows into the inner chamber 202a. The molten resin flowing into the inner chamber 202a moves toward the rear end side along the cone rear end portion 210, and is supplied to the die via the molten resin outlet 211 and the flow paths 213, 214, and 301.
[0027]
In particular, this case of the crosshead 200, the front and rear of the crosshead body 201 having a cylindrical shape, wherein a molten resin inlet 204 and the outlet 211 of the molten resin, so as to form a cross-head body 201 coaxially respectively The breaker unit 206 is also provided so as to be coaxial with the crosshead body 201. Therefore, for example, as indicated by arrows F 3 and F 4 in the figure, the residence time in the space 202 is almost constant regardless of the molten resin passing through any side of the space 202. Accordingly, the temperature of the molten resin flowing into the flow path 213 from the molten resin outlet 211 is made uniform. As a result, a stirrer is provided in the joint, the die temperature and the gap between the lip portions are finely adjusted, etc. Compared with the conventional crosshead 2 that requires countermeasures, the purging property during resin purging and the workability in adjusting the temperature of the molten resin are improved.
[0028]
In addition, since the mechanism for adjusting the back pressure of the molten resin is configured as the adjusting means 302, there is no local heat generation of the resin that has conventionally occurred due to the back pressure adjustment by the needle valve, and the temperature unevenness of the molten resin hardly occurs. . Furthermore, since the molten resin is uniformly introduced into the molten resin outlet 211 along the tapered cone rear end portion 210 installed in the inner chamber 202a so as to be coaxial with the crosshead body 201, the molten resin As a result, the molten resin stays uneven at the outlet 211, and the deterioration (carbonization) of the resin is reduced.
[0029]
In the cross head 200 described above, the cone-shaped cone tip 209 is used, but instead of the cone tip 209, a hole 217 is provided on the tip of the support cylinder 207 as shown in FIG. What covered the pore 217 from the front end side with the screen 218 which a molten resin can pass may be used as a breaker unit. In this case, the molten resin flows not only from the side surface of the support cylinder 207 but also from the pores 217 into the inner chamber 202a.
[0030]
【The invention's effect】
As described above, the resin-feeding crosshead according to the present invention includes a cylindrical support cylinder in which a plurality of pores are formed along the radial direction and a molten resin can pass through, and a screen supported by the support cylinder. A cylindrical crosshead main body whose inside is divided into two chambers by the screen of the cylindrical breaker unit, and a space formed inside the crosshead main body is temporarily reduced in diameter and then expanded in diameter. A die for an extruder having a liner that connects the crosshead body to the rear end of the heating cylinder, and a block that is provided on the rear end side of the breaker unit and includes a flow path that changes the path of the molten resin downward. a resin supply crosshead for supplying molten resin, wherein the support cylinder of the breaker unit is inserted into the liner, the molten tree formed the reduced diameter portion of the liner The inlet inner outside chamber of the two chambers, the out the chamber outlet of the molten resin which is formed at the rear end of the two chambers of the breaker unit, is provided so as to respectively form the crosshead body coaxial The die is suspended and supported so that the crosshead main body extends in the same direction and horizontally as the heating cylinder below the heating cylinder via a joint having a flow path therein. It is characterized by doing. Therefore, there is no difference in residence time in the crosshead body between the molten resins passing through the crosshead body, and the temperature of the molten resin supplied to the die from the outlet of the molten resin is made uniform. Therefore, compared to the conventional crosshead, which requires measures such as providing a stirrer in the joint and finely adjusting the die temperature and the lip spacing, the purgeability and melting during resin purging Workability in adjusting the temperature of the resin is improved.
[0031]
Further, when the adjusting means for adjusting the back pressure of the molten resin is provided between the outlet of the molten resin and the die, local heat generation of the molten resin at the time of adjusting the back pressure of the molten resin is prevented.
[0032]
Furthermore, when the breaker unit is installed on the inner chamber side of the crosshead main body so that the conical cone is coaxial with the crosshead main body from the front end side to the rear end of the crosshead main body. Since the molten resin is uniformly introduced into the outlet of the molten resin along the cone, unevenness of the molten resin at the outlet of the molten resin is less likely to occur, and deterioration (carbonization) of the resin is reduced.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view taken along the line II of FIG. 2 showing an example of the structure of a crosshead of the present invention.
FIG. 2 is a partial cross-sectional view of the crosshead viewed from an arrow II in FIG. 1 showing an example of the structure of the adjusting means according to the crosshead of the present invention.
FIG. 3 is a partial cross-sectional view of a crosshead showing an example of a structure of a breaker according to the crosshead of the present invention.
FIG. 4 is an upper perspective view showing an example of the structure of a sheet-like article manufacturing apparatus.
FIG. 5 is a cross-sectional view showing an example of the structure of a conventional crosshead.
[Explanation of symbols]
1 heating cylinder
4- die 200 (for resin supply) Crosshead 201 Crosshead body
202 Space 202a Inner chamber 202b Outer chamber formed inside the crosshead body
203 liner 204 molten resin inlet
206 Breaker unit 207 Support cylinder 208, 218 Screen
209 Cone front end 210 Cone rear end (cone)
211 Outlet of molten resin
212 blocks
213 flow path
300 joint 302 adjusting means

Claims (5)

径方向に沿って複数の細孔が形成されて溶融樹脂が通過可能な円筒状の支持筒及びこの支持筒に支持されたスクリーンを備える円筒状のブレーカユニットの前記スクリーンによりその内部が内外２室に分割される円筒状のクロスヘッド本体と、該クロスヘッド本体の内部に形成された空間を暫時縮径させた後拡径させて前記クロスヘッド本体を加熱筒の後端に連結するライナーと、前記ブレーカユニットの後端側に設置されて溶融樹脂の進路を下方に転換させる流路を備えるブロックと、を有する押出成形機のダイに溶融樹脂を供給する樹脂供給用クロスヘッドであって、前記ブレーカユニットの前記支持筒が前記ライナーに挿入され、前記ライナーの縮径部に形成された前記溶融樹脂の入口が前記２室のうち外室に、前記ブレーカユニットの後端に形成された前記溶融樹脂の出口が前記２室のうち内室に、それぞれ前記クロスヘッド本体と同軸をなすよう設けられて連通されているとともに、前記クロスヘッド本体が内部に流路を備えるジョイントを介して前記加熱筒の下方において該加熱筒と略同一方向かつ水平に延設されるように前記ダイを吊して支持することを特徴とする樹脂供給用クロスヘッド。 A cylindrical breaker unit comprising a cylindrical support cylinder in which a plurality of pores are formed along the radial direction and through which molten resin can pass, and a screen supported by the support cylinder, has an inside and two chambers inside. A cylindrical crosshead main body divided into a liner, a liner that connects the crosshead main body to the rear end of the heating cylinder by expanding the diameter of the space formed inside the crosshead main body after being temporarily reduced in diameter, and a said breaker unit resin feed crosshead for supplying molten resin into a die of the extrusion molding machine having a block with the passage of converting down the path of the molten resin is placed on the rear side, of the The support cylinder of the breaker unit is inserted into the liner, and the inlet of the molten resin formed in the reduced diameter portion of the liner is in the outer chamber of the two chambers. In out the chamber outlet is of the two chambers of the molten resin which is formed at the rear end, is provided so as to respectively form the crosshead body coaxial with and communicates, the crosshead body a flow path therein A resin-feeding crosshead , wherein the die is suspended and supported so as to extend substantially in the same direction and horizontally as the heating cylinder below the heating cylinder through a joint provided . 前記溶融樹脂の出口と前記ダイとの間に、前記溶融樹脂の背圧を調節する調節手段が設けられていることを特徴とする請求項１記載の樹脂供給用クロスヘッド。2. The resin-feeding crosshead according to claim 1, wherein an adjusting means for adjusting a back pressure of the molten resin is provided between the outlet of the molten resin and the die. 前記ブレーカユニットは、前記クロスヘッド本体の内室側に、円錐状をなすコーンが、前記クロスヘッド本体の先端側から後端に向け、前記クロスヘッド本体と同軸をなすよう設置されていることを特徴とする請求項１または２記載の樹脂供給用クロスヘッド。 The breaker unit, the inner chamber side of the crosshead body, cone forming a cone-shape, toward the rear from the front end side of the crosshead body, that is disposed so as to form the cross-head body coaxial The crosshead for resin supply according to claim 1 or 2, characterized in that: 前記ブレーカユニットの前記支持筒の先端面にプレート状をなすスクリーンが支持され、前記溶融樹脂の入口が、このスクリーンを介して前記内室に連通されていることを特徴とする請求項１ないし３のいずれか記載の樹脂供給用クロスヘッド。 Wherein the said screen forming a plate-like on the distal end surface of the support cylinder supporting the breaker unit, an inlet of the molten resin, claims 1, characterized in that communicates with the said chamber through the screen 3 The crosshead for resin supply according to any one of the above. 前記樹脂供給用クロスヘッドが押出ラミネート装置に用いられるものであることを特徴とする請求項１ないし４のいずれか記載の樹脂供給用クロスヘッド。The resin supply crosshead according to any one of claims 1 to 4, wherein the resin supply crosshead is used in an extrusion laminating apparatus.
JP21100797A 1997-08-05 1997-08-05 Resin supply crosshead Expired - Fee Related JP3816201B2 (en)

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JP21100797A JP3816201B2 (en) 1997-08-05 1997-08-05 Resin supply crosshead

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JP3816201B2 true JP3816201B2 (en) 2006-08-30

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