JP4279976B2 - Desolvation method by twin screw dewatering extruder and twin screw dewatering extruder - Google Patents

Desolvation method by twin screw dewatering extruder and twin screw dewatering extruder Download PDF

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JP4279976B2
JP4279976B2 JP2000143600A JP2000143600A JP4279976B2 JP 4279976 B2 JP4279976 B2 JP 4279976B2 JP 2000143600 A JP2000143600 A JP 2000143600A JP 2000143600 A JP2000143600 A JP 2000143600A JP 4279976 B2 JP4279976 B2 JP 4279976B2
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screw
seal ring
cylinder
solution
dewatering
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JP2001322155A (en
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典聖 織田
淳 柿崎
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Japan Steel Works Ltd
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Japan Steel Works Ltd
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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
    • B29C48/50—Details of extruders
    • B29C48/505—Screws
    • B29C48/56—Screws having grooves or cavities other than the thread or the channel
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B7/00—Mixing; Kneading
    • B29B7/30—Mixing; Kneading continuous, with mechanical mixing or kneading devices
    • B29B7/34—Mixing; Kneading continuous, with mechanical mixing or kneading devices with movable mixing or kneading devices
    • B29B7/38—Mixing; Kneading continuous, with mechanical mixing or kneading devices with movable mixing or kneading devices rotary
    • B29B7/46—Mixing; Kneading continuous, with mechanical mixing or kneading devices with movable mixing or kneading devices rotary with more than one shaft
    • B29B7/48—Mixing; Kneading continuous, with mechanical mixing or kneading devices with movable mixing or kneading devices rotary with more than one shaft with intermeshing devices, e.g. screws
    • B29B7/482—Mixing; Kneading continuous, with mechanical mixing or kneading devices with movable mixing or kneading devices rotary with more than one shaft with intermeshing devices, e.g. screws provided with screw parts in addition to other mixing parts, e.g. paddles, gears, discs
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B7/00—Mixing; Kneading
    • B29B7/30—Mixing; Kneading continuous, with mechanical mixing or kneading devices
    • B29B7/34—Mixing; Kneading continuous, with mechanical mixing or kneading devices with movable mixing or kneading devices
    • B29B7/38—Mixing; Kneading continuous, with mechanical mixing or kneading devices with movable mixing or kneading devices rotary
    • B29B7/46—Mixing; Kneading continuous, with mechanical mixing or kneading devices with movable mixing or kneading devices rotary with more than one shaft
    • B29B7/48—Mixing; Kneading continuous, with mechanical mixing or kneading devices with movable mixing or kneading devices rotary with more than one shaft with intermeshing devices, e.g. screws
    • B29B7/482—Mixing; Kneading continuous, with mechanical mixing or kneading devices with movable mixing or kneading devices rotary with more than one shaft with intermeshing devices, e.g. screws provided with screw parts in addition to other mixing parts, e.g. paddles, gears, discs
    • B29B7/483—Mixing; Kneading continuous, with mechanical mixing or kneading devices with movable mixing or kneading devices rotary with more than one shaft with intermeshing devices, e.g. screws provided with screw parts in addition to other mixing parts, e.g. paddles, gears, discs the other mixing parts being discs perpendicular to the screw axis
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B7/00—Mixing; Kneading
    • B29B7/30—Mixing; Kneading continuous, with mechanical mixing or kneading devices
    • B29B7/34—Mixing; Kneading continuous, with mechanical mixing or kneading devices with movable mixing or kneading devices
    • B29B7/38—Mixing; Kneading continuous, with mechanical mixing or kneading devices with movable mixing or kneading devices rotary
    • B29B7/46—Mixing; Kneading continuous, with mechanical mixing or kneading devices with movable mixing or kneading devices rotary with more than one shaft
    • B29B7/48—Mixing; Kneading continuous, with mechanical mixing or kneading devices with movable mixing or kneading devices rotary with more than one shaft with intermeshing devices, e.g. screws
    • B29B7/488—Parts, e.g. casings, sealings; Accessories, e.g. flow controlling or throttling devices
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B7/00—Mixing; Kneading
    • B29B7/30—Mixing; Kneading continuous, with mechanical mixing or kneading devices
    • B29B7/34—Mixing; Kneading continuous, with mechanical mixing or kneading devices with movable mixing or kneading devices
    • B29B7/38—Mixing; Kneading continuous, with mechanical mixing or kneading devices with movable mixing or kneading devices rotary
    • B29B7/46—Mixing; Kneading continuous, with mechanical mixing or kneading devices with movable mixing or kneading devices rotary with more than one shaft
    • B29B7/48—Mixing; Kneading continuous, with mechanical mixing or kneading devices with movable mixing or kneading devices rotary with more than one shaft with intermeshing devices, e.g. screws
    • B29B7/488—Parts, e.g. casings, sealings; Accessories, e.g. flow controlling or throttling devices
    • B29B7/489—Screws
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B7/00—Mixing; Kneading
    • B29B7/74—Mixing; Kneading using other mixers or combinations of mixers, e.g. of dissimilar mixers ; Plant
    • B29B7/7476—Systems, i.e. flow charts or diagrams; Plants
    • B29B7/7495—Systems, i.e. flow charts or diagrams; Plants for mixing rubber
    • 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
    • B29C48/40—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 using two or more parallel screws or at least two parallel non-intermeshing screws, e.g. twin 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
    • B29C48/25—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
    • B29C48/50—Details of extruders
    • B29C48/505—Screws
    • B29C48/57—Screws provided with kneading disc-like elements, e.g. with oval-shaped elements
    • 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
    • B29C48/50—Details of extruders
    • B29C48/505—Screws
    • B29C48/59—Screws characterised by details of the thread, i.e. the shape of a single thread of the material-feeding screw
    • B29C48/60—Thread tops

Description

【０００１】
【発明の属する技術分野】
本発明は、プラスチック、例えば乳化重合法によるＡＢＳや合成ゴムの製造工程における溶液の分離（脱溶液）・乾燥工程に利用する二軸脱水押出機による脱溶液方法および二軸脱水押出機に関するものである。
【０００２】
【従来の技術】
先に本出願人は、実公平６−５８６５号公報によって、次のような構成を有する二軸脱水押出機を提案した。
【０００３】
同４において、符号１で示されるものはシリンダである。このシリンダ１は、複数のシリンダＣ1〜Ｃ8が上流側から順次直列配設されてなり、Ｃ1は供給シリンダ、Ｃ2，Ｃ4は脱水スリット２を有する脱水シリンダ、Ｃ3，Ｃ5，Ｃ6，Ｃ8は中間シリンダ、Ｃ7はベントシリンダである。
【０００４】
このシリンダ１内には、一対のスクリュ軸６が同方向に回転可能に並設されている。スクリュ軸６には順ネジフライト３、ニーディングディスク４及びシーリング部７が直列に設けられ、各順ネジフライト３は、互いに軸方向において外径部がかみ合うように構成されている。本実施例では、ニーディングディスク４及びシーリング部７は、中間シリンダＣ5、Ｃ6の内部に位置している。
【０００５】
以下、その動作について説明する。
【０００６】
前記シールリング部７の上流側に供給された原料は、シールリング部７の各隙間によってその流れが制限されるために、シールリング部７の上流側で加圧・圧縮され、含有溶液が絞り出される。原料中から絞り出された溶液は、シリンダ１とスクリュ山頂部の隙間および原料が充満されていないスクリュフライト溝に移動して、圧力の低い脱水シリンダＣ2，Ｃ4側へ移動し、その脱水スリット２から抜き出される。さらに、シールリング部７の各隙間は、スクリュの回転数の変化に関係なく一定しているので、シールリング部７の上流側における原料の溶融状態および加圧力が定常的であり、連続的、かつ定常的に一定割合の原料を下流側へ搬送することができる。
【０００７】
【発明が解決しようとする課題】
従来の二軸脱水押出機では、ニーディングディスクとシーリング部により原料中から絞り出された溶液が、送り効率の良い順ネジフライトにより原料と共に、下流側（ダイス側）へ強制的に輸送されので、脱溶液効率が向上しないという問題があった。
【０００８】
本発明は、上記問題点を解決するためになされたものであって、プラスチックや合成ゴムの脱溶液工程における脱溶液効率が向上する二軸脱水押出機による脱溶液方法および二軸脱水押出機を提供することを目的とする。
【０００９】
【課題を解決するための手段】
本発明による二軸脱水押出機による脱溶液方法は、シリンダ内に設けられた一対のスクリュ軸を用いて原料を輸送し、スクリュ軸に設けたシールリング部により原料中から溶液を絞り出し、該絞りだされた溶液を、シールリング部より上流側に設けた脱水シリンダの脱水スリットを介して排出するようにした脱溶液方法において、前記一対のスクリュ軸の各前記シールリング部には、外径が前記スクリュ軸の軸方向に互いにかみ合うようにして円板形のシールリングが設けられており、脱水シリンダに対応する位置からシールリング部のシールリング上流位置までのスクリュ軸上に配置された順ネジフライトに、切り欠き部を設け、該切り欠き部を介して前記溶液を脱水スリットに移動して抜きとることを特徴とする。
【００１０】
本発明による二軸脱水押出機は、シリンダ内に設けられた一対のスクリュ軸を用いて原料を輸送し、スクリュ軸に設けたシールリング部により原料中から溶液を絞り出し、該絞りだされた溶液を、シールリング部より上流側の脱水シリンダに設けた脱水スリットを介して排出するようにした二軸脱水押出機において、前記一対のスクリュ軸の各前記シールリング部には、外径が前記スクリュ軸の軸方向に互いにかみ合うようにして円板形のシールリングが設けられており、脱水シリンダに対応する位置からシールリング部のシールリング上流位置までのスクリュ軸上に配置された順ネジフライトに、切り欠き部を設けたことを特徴とする。
【００１１】
このように、順ネジフライトに切り欠き部を設けたことにより、原料中から絞り出された溶液は、原料の送り効率を落とすことなく上流側へ逆流する。これにより、スリットからの脱溶液効率を上げることが可能となる。
【００１２】
【発明の実施の形態】
本発明の実施の形態を実施例に基づき図面を参照して説明する。なお、従来例と同一又は同等部分については、同一符号を用いて説明する。
【００１３】
図１は、本発明による二軸脱水押出機の概略全体構成図である。゛
同図において、符号１で示されるものはシリンダである。このシリンダ１は、複数のシリンダＣ1〜Ｃ8が上流側から順次直列配設されてなり、Ｃ1は供給シリンダ、Ｃ2，Ｃ4は脱水スリットを有する脱水シリンダ、Ｃ3，Ｃ5，Ｃ6，Ｃ8は中間シリンダ、Ｃ9はベントシリンダである。
【００１４】
このシリンダ１内には、一対のスクリュ軸６が同方向に回転可能に並設されている。スクリュ軸６には順ネジフライト３、ニーディングディスク４及びシーリング部７が直列に設けられ、各順ネジフライト３は、互いに軸方向において外径部がかみ合うように構成されている。本実施例では、ニーディングディスク４及びシーリング部７は、中間シリンダＣ５〜Ｃ６の内部に位置している。
【００１５】
脱水シリンダＣ2に対応する位置からシールリング部７のシールリング８の上流位置までのスクリュ軸３上に配置された順ネジフライト３には、切り欠き部５が複数設けられている。この切り欠き部５は、スクリュ軸６に対して平行または傾斜した切り欠き部とすることが好ましい。
【００１６】
図２はシールリング部の要部断面図である。
【００１７】
同図に示すように、シールリング部７は、各スクリュ軸６毎に設けられた順ネジフライト３（またはニーディングディスク４）の下流側に形成されている。シールリング部７は、各スクリュ軸６毎に形成された片面にテーパ部８ａを有するほぼ円板形のシールリング８がかみ合されて構成されている。なお、一方のシールリング８のテーパー部８ａは上流側、他方のテーパー部８ａは下流側の面に形成されている。
【００１８】
各シールリング８の外径８ｂは、その軸方向において互いにかみ合うように構成されていると共に、この外径８ｂとシリンダ１の内径１ａの間には、隙間ａ1が形成されている。各シールリング８のテーパー部８ａの反対側に形成されている垂直面８ｃ間には、軸方向隙間ａ2が形成されている。これにより、原料の通過個所が、シールリング８の外径８ｂとシリンダ１の内径１ａとの隙間ａ1および各シールリング８間の軸方向隙間ａ2のみとなる。これらの各隙間ａ1，ａ2は、スクリュ軸１の他の部位すなわち順ネジフライト部３の流路面積よりも小さく構成されているので、原料の流れを制限することができる。本実施例では、シールリング８の上流位置までスクリュ軸６上に配置された順フライト３に切り欠き部５が形成されている。
【００１９】
図３は他の実施例のシールリング部の要部断面図である。
【００２０】
同図に示すように、シールリング部７は、各スクリュ軸６毎に形成された複数の円板形のシールリング８，８がかみ合わされて構成されている。その他の構成は、上記実施例と同一であるので、その説明は省略する。
【００２１】
以下に、その動作について説明する。
【００２２】
前記シールリング部７の上流側に供給された原料は、シールリング部７の各隙間によってその流れが制限されるために、シールリング部７の上流側で加圧・圧縮され、含有溶液が絞り出される。原料中から絞り出された溶液は、シリンダ１とスクリュ山頂部の隙間および原料が充満されていないスクリュフライト溝並びに順ネジフライト３に設けられた切り欠き部５に移動して、圧力の低い脱水シリンダＣ2，Ｃ2側へ移動し、脱水スリット２から抜き出される。
【００２３】
さらに、シールリング部７の各隙間ａ1，ａ2は、スクリュの回転数の変化に関係なく一定しているので、シールリング部７の上流側における原料の溶融状態および加圧力が定常的であり、連続的、かつ定常的に一定割合の原料を下流側へ搬送することができる。
【００２４】
このように、順ネジフライト３に切り欠き部５を設けたことにより、原料中から絞り出された溶液は、原料の送り効率を落とすことなく上流側へ逆流する。これにより、脱水スリット２からの脱溶液効率を上げることが可能となる。
【００２５】
【実施例】
原料であるＥＰＤＭクラムを、二軸脱水押出機として株式会社日本製鋼所製、ＴＥＭ６５αＩＩ−３１．５ＡＷ−Ｖ（商品名）を用いて脱水・乾燥試験を行った。なお、上記二軸脱水押出機のスクリュは、外径が６５ｍｍ、Ｌ／Ｄが３１．５であり、主モータは、３００ＫＷの直流モータであり、スクリュ回転速度は、６０〜６００ｒｐｍである。
【００２６】
本発明による順ネジフライトに切り欠き部を設けたものと、比較例の順ネジフライトに切り欠き部を設けないものの試験結果を表１に示す。順ネジフライトに切り欠き部を設けたものは、脱溶液効率とスクリュ回転数当たりの処理能力が大幅に向上している。
【００２７】
【表１】

Figure 0004279976
【００２８】
【発明の効果】
従来、原料中から絞りだされた溶液の上流側へ逆流する個所は、シリンダとスクリュ山頂部のスキマおよび原料が充満されていないスクリュフライト溝内のみであったが、本発明では、順ネジフライトに切り欠き部を設けることにより、逆流する個所が増加し、二軸脱水押出機の脱溶液効率を上げることできた。従って、品質が向上すると共に、スクリュ回転数当たりの処理能力を大幅に高めることができた。
【図面の簡単な説明】
【図１】本発明による二軸脱水押出機の概略全体構成図である。
【図２】シールリング部の要部断面図である。
【図３】他の実施例のシールリング部の要部断面図である。
【図４】従来の二軸脱水押出機の概略全体構成図である。
【符号の説明】
１ シリンダ
２ 脱水スリット
３ 順ネジフライト
５ 切り欠き部
４ ニーディングディスク
６ スクリュ軸
７ シールリング部
８ シールリング
８ｂ 外径
Ｃ１ 供給シリンダ
Ｃ２、Ｃ４ 脱水シリンダ
Ｃ３、Ｃ５〜Ｃ６、Ｃ９ 中間シリンダ
Ｃ８ ベントシリンダ[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a solution removal method using a twin-screw dewatering extruder and a twin-screw dewatering extruder used for separation (desolution) / drying of a solution in the production process of plastics such as ABS or synthetic rubber by emulsion polymerization. is there.
[0002]
[Prior art]
The present applicant previously proposed a twin-screw dewatering extruder having the following configuration according to Japanese Utility Model Publication No. 6-5865.
[0003]
In FIG. 4, what is indicated by reference numeral 1 is a cylinder. In this cylinder 1, a plurality of cylinders C 1 to C 8 are sequentially arranged in series from the upstream side, C 1 is a supply cylinder, C 2 and C 4 are dewatering cylinders having a dewatering slit 2, C 3 and C 5. , C 6 and C 8 are intermediate cylinders, and C 7 is a vent cylinder.
[0004]
A pair of screw shafts 6 are arranged in the cylinder 1 so as to be rotatable in the same direction. The screw shaft 6 is provided with a forward screw flight 3, a kneading disk 4 and a sealing portion 7 in series, and the forward screw flights 3 are configured such that their outer diameter portions engage with each other in the axial direction. In this embodiment, the kneading disc 4 and the sealing portion 7 are located inside the intermediate cylinders C 5 and C 6 .
[0005]
The operation will be described below.
[0006]
Since the flow of the raw material supplied to the upstream side of the seal ring part 7 is restricted by the gaps of the seal ring part 7, it is pressurized and compressed on the upstream side of the seal ring part 7, and the contained solution is squeezed. Is issued. The solution squeezed out from the raw material moves to the gap between the cylinder 1 and the top of the screw and the screw flight groove not filled with the raw material, and moves to the dehydrating cylinders C 2 and C 4 where the pressure is low. It is extracted from the slit 2. Furthermore, since each gap of the seal ring part 7 is constant regardless of the change in the rotational speed of the screw, the molten state and the applied pressure of the raw material on the upstream side of the seal ring part 7 are steady, continuous, In addition, a constant ratio of raw materials can be conveyed downstream.
[0007]
[Problems to be solved by the invention]
In the conventional twin-screw dewatering extruder, the solution squeezed from the raw material by the kneading disc and the sealing part is forcibly transported to the downstream side (die side) together with the raw material by forward screw flight with good feed efficiency. There was a problem that the desolution efficiency was not improved.
[0008]
The present invention has been made in order to solve the above-described problems, and provides a solution removal method using a twin-screw dehydration extruder and a twin-screw dehydration extruder that improve the solution removal efficiency in the solution removal process of plastics and synthetic rubbers. The purpose is to provide.
[0009]
[Means for Solving the Problems]
The desolvation method using the twin-screw dehydration extruder according to the present invention transports a raw material using a pair of screw shafts provided in a cylinder, and squeezes the solution out of the raw material by a seal ring portion provided on the screw shaft. In the desolvation method in which the discharged solution is discharged through a dewatering slit of a dewatering cylinder provided upstream from the seal ring part , each seal ring part of the pair of screw shafts has an outer diameter. A disc-shaped seal ring is provided so as to mesh with each other in the axial direction of the screw shaft, and a forward screw disposed on the screw shaft from a position corresponding to the dehydrating cylinder to a position upstream of the seal ring in the seal ring portion. The flight is provided with a notch, and the solution is moved to the dehydration slit via the notch and is taken out.
[0010]
The biaxial dewatering extruder according to the present invention transports a raw material using a pair of screw shafts provided in a cylinder, squeezes out the solution from the raw material by a seal ring portion provided on the screw shaft, and the squeezed solution Is discharged through a dewatering slit provided in a dewatering cylinder upstream of the seal ring portion, the outer diameter of each of the seal ring portions of the pair of screw shafts is the screw. Disc-shaped seal rings are provided so as to engage with each other in the axial direction of the shaft, and forward screw flights arranged on the screw shaft from the position corresponding to the dewatering cylinder to the upstream position of the seal ring in the seal ring part In addition, a notch portion is provided.
[0011]
Thus, by providing a notch in the forward screw flight, the solution squeezed out of the raw material flows back upstream without reducing the feed efficiency of the raw material. Thereby, it is possible to improve the solution removal efficiency from the slit.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described based on examples with reference to the drawings. Note that the same or equivalent parts as those in the conventional example will be described using the same reference numerals.
[0013]
FIG. 1 is a schematic overall configuration diagram of a twin-screw dewatering extruder according to the present invention. In the figure, what is indicated by reference numeral 1 is a cylinder. In this cylinder 1, a plurality of cylinders C 1 to C 8 are sequentially arranged in series from the upstream side, C 1 is a supply cylinder, C 2 and C 4 are dehydration cylinders having dehydration slits, C 3 , C 5 , C 6 and C 8 are intermediate cylinders, and C 9 is a vent cylinder.
[0014]
A pair of screw shafts 6 are arranged in the cylinder 1 so as to be rotatable in the same direction. The screw shaft 6 is provided with a forward screw flight 3, a kneading disk 4 and a sealing portion 7 in series, and the forward screw flights 3 are configured such that their outer diameter portions engage with each other in the axial direction. In the present embodiment, the kneading disc 4 and the sealing portion 7 are located inside the intermediate cylinders C5 to C6.
[0015]
The forward thread flight 3 disposed on the screw shaft 3 from the position corresponding to the dewatering cylinder C 2 to the upstream position of the seal ring 8 of the seal ring portion 7 is provided with a plurality of notches 5. The notch 5 is preferably a notch that is parallel or inclined with respect to the screw shaft 6.
[0016]
FIG. 2 is a cross-sectional view of the main part of the seal ring portion.
[0017]
As shown in the figure, the seal ring portion 7 is formed on the downstream side of the forward screw flight 3 (or kneading disc 4) provided for each screw shaft 6. The seal ring portion 7 is configured by meshing a substantially disc-shaped seal ring 8 having a tapered portion 8a on one surface formed for each screw shaft 6. The taper portion 8a of one seal ring 8 is formed on the upstream side, and the other taper portion 8a is formed on the downstream surface.
[0018]
The outer diameters 8 b of the seal rings 8 are configured to mesh with each other in the axial direction, and a gap a 1 is formed between the outer diameter 8 b and the inner diameter 1 a of the cylinder 1. An axial gap a 2 is formed between the vertical surfaces 8 c formed on the opposite side of the tapered portion 8 a of each seal ring 8. As a result, the passage of the raw material is only the gap a 1 between the outer diameter 8 b of the seal ring 8 and the inner diameter 1 a of the cylinder 1 and the axial gap a 2 between the seal rings 8. Since each of these gaps a 1 and a 2 is configured to be smaller than the other part of the screw shaft 1, that is, the flow path area of the forward screw flight part 3, the flow of the raw material can be restricted. In the present embodiment, the notch 5 is formed in the forward flight 3 arranged on the screw shaft 6 up to the upstream position of the seal ring 8.
[0019]
FIG. 3 is a cross-sectional view of a main part of a seal ring portion of another embodiment.
[0020]
As shown in the figure, the seal ring portion 7 is configured by meshing a plurality of disc-shaped seal rings 8, 8 formed for each screw shaft 6. The other configuration is the same as that of the above embodiment, and the description thereof is omitted.
[0021]
The operation will be described below.
[0022]
Since the flow of the raw material supplied to the upstream side of the seal ring part 7 is restricted by the gaps of the seal ring part 7, it is pressurized and compressed on the upstream side of the seal ring part 7, and the contained solution is squeezed. Is issued. The solution squeezed out of the raw material moves to the gap between the cylinder 1 and the top of the screw, the screw flight groove not filled with the raw material, and the notch portion 5 provided in the forward screw flight 3, and dehydration at low pressure. move the cylinder C 2, C 2 side, is withdrawn from the dewatering slit 2.
[0023]
Further, since the gaps a 1 and a 2 of the seal ring part 7 are constant regardless of changes in the rotational speed of the screw, the molten state and the applied pressure of the raw material upstream of the seal ring part 7 are steady. Yes, a constant ratio of raw materials can be conveyed downstream and continuously.
[0024]
Thus, by providing the notch part 5 in the forward screw flight 3, the solution squeezed out from the raw material flows backward upstream without reducing the feed efficiency of the raw material. Thereby, it is possible to increase the solution removal efficiency from the dehydration slit 2.
[0025]
【Example】
The raw material EPDM crumb was subjected to a dehydration / drying test using TEM65αII-31.5AW-V (trade name) manufactured by Nippon Steel Works, Ltd. as a twin-screw dehydration extruder. The screw of the above-mentioned twin-screw dewatering extruder has an outer diameter of 65 mm, L / D of 31.5, the main motor is a 300 KW DC motor, and the screw rotation speed is 60 to 600 rpm.
[0026]
Table 1 shows the test results of the forward screw flight according to the present invention provided with a notch and the forward screw flight of the comparative example not provided with a notch. A forward screw flight with a notch has greatly improved solution removal efficiency and throughput per screw rotation.
[0027]
[Table 1]
Figure 0004279976
[0028]
【The invention's effect】
Conventionally, the location where the solution squeezed out of the raw material flows backward to the upstream side is only in the cylinder and screw clearance at the top of the screw and in the screw flight groove not filled with the raw material. By providing the notch in the area, the number of backflow areas increased, and the desolvation efficiency of the twin-screw dewatering extruder could be increased. Therefore, the quality was improved and the processing capacity per screw rotation speed could be greatly increased.
[Brief description of the drawings]
FIG. 1 is a schematic overall configuration diagram of a twin-screw dewatering extruder according to the present invention.
FIG. 2 is a cross-sectional view of a main part of a seal ring part.
FIG. 3 is a cross-sectional view of a main part of a seal ring part according to another embodiment.
FIG. 4 is a schematic overall configuration diagram of a conventional twin-screw dewatering extruder.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Cylinder 2 Dehydration slit 3 Forward thread flight 5 Notch part 4 Kneading disk 6 Screw shaft 7 Seal ring part 8 Seal ring 8b Outer diameter C1 Supply cylinder C2, C4 Dehydration cylinder C3, C5-C6, C9 Intermediate cylinder C8 Vent cylinder

Claims (2)

シリンダ（１）内に設けられた一対のスクリュ軸（６）を用いて原料を輸送し、前記スクリュ軸（６）に設けたシールリング部（７）により原料中から溶液を絞り出し、該絞りだされた溶液を、前記シールリング部（７）より上流側に設けた脱水シリンダ（Ｃ2，Ｃ4）の脱水スリット（２）を介して排出するようにした脱溶液方法において、
前記一対のスクリュ軸（６）の各前記シールリング部（７）には、外径（８ｂ）が前記スクリュ軸（６）の軸方向に互いにかみ合うようにして円板形のシールリング（８）が設けられており、
前記脱水シリンダ（Ｃ2，Ｃ4）に対応する位置から前記シールリング部（７）の前記シールリング（８）上流位置までのスクリュ軸（６）上に配置された順ネジフライト（３）に、切り欠き部（５）を設け、該切り欠き部（５）を介して前記溶液を脱水スリット（２）に移動して抜きとることを特徴とする二軸脱水押出機による脱溶液方法。Transports raw material with the cylinder (1) a pair of screw shafts provided in (6), squeeze the solution from the raw material by the sealing ring portion provided on the screw shaft (6) (7), the narrowed Lida by solution in de-solution method to discharge through the dewatering slit (2) of the dewatering cylinder provided sealing ring portions than (7) on the upstream side (C 2, C 4),
Each of the seal ring portions (7) of the pair of screw shafts (6) has a disk-shaped seal ring (8) such that an outer diameter (8b) meshes with each other in the axial direction of the screw shaft (6). Is provided,
Wherein the dehydrating cylinder (C 2, C 4) on the sealing ring (8) screw shaft to the upstream position (6) disposed on the order screw flights of said seal ring unit from the corresponding position (7) (3) A solution removal method using a twin-screw dewatering extruder, wherein a notch portion (5) is provided, and the solution is moved to the dewatering slit (2) through the notch portion (5) and removed. シリンダ内（１）に設けられた一対のスクリュ軸（６）を用いて原料を輸送し、前記スクリュ軸（６）に設けたシールリング部（７）により原料中から溶液を絞り出し、該絞りだされた溶液を、前記シールリング部（７）より上流側の脱水シリンダ（Ｃ2，Ｃ4）に設けた脱水スリット（２）を介して排出するようにした二軸脱水押出機において、
前記一対のスクリュ軸（６）の各前記シールリング部（７）には、外径（８ｂ）が前記スクリュ軸（６）の軸方向に互いにかみ合うようにして円板形のシールリング（８）が設けられており、
前記脱水シリンダ（Ｃ2，Ｃ4）に対応する位置から前記シールリング部（７）の前記シールリング（８）上流位置までのスクリュ軸（６）上に配置された順ネジフライト（３）に、切り欠き部（５）を設けたことを特徴とする二軸脱水押出機。It transports raw material using a pair of screw shafts provided in the cylinder (1) to (6), squeeze the solution from the raw material by the sealing ring portion provided on the screw shaft (6) (7), the narrowed Lida by solution, in the sealing ring portion (7) from the upstream side of the dewatering cylinder (C 2, C 4) to provided dehydrated slits (2) biaxial dewatering extruder to discharge through,
Each of the seal ring portions (7) of the pair of screw shafts (6) has a disk-shaped seal ring (8) such that an outer diameter (8b) meshes with each other in the axial direction of the screw shaft (6). Is provided,
Wherein the dehydrating cylinder (C 2, C 4) on the sealing ring (8) screw shaft to the upstream position (6) disposed on the order screw flights of said seal ring unit from the corresponding position (7) (3) A twin-screw dewatering extruder provided with a notch (5).
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