JP3738422B2 - Kneading extruder for granulation - Google Patents

Kneading extruder for granulation Download PDF

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Publication number
JP3738422B2
JP3738422B2 JP2001381514A JP2001381514A JP3738422B2 JP 3738422 B2 JP3738422 B2 JP 3738422B2 JP 2001381514 A JP2001381514 A JP 2001381514A JP 2001381514 A JP2001381514 A JP 2001381514A JP 3738422 B2 JP3738422 B2 JP 3738422B2
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Prior art keywords
screw
granulation
kneading extruder
downstream portion
kneading
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JP2001381514A
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JP2003181827A (en
Inventor
一浩 小舘
茂樹 井上
伸久 小林
和之 中村
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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
    • B29C48/64—Screws with two or more threads
    • B29C48/645—Screws with two or more threads neighbouring threads and channels having identical configurations
    • 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
    • B29B7/465—Mixing; Kneading continuous, with mechanical mixing or kneading devices with movable mixing or kneading devices rotary with more than one shaft each shaft comprising rotor parts of the Banbury type in addition to screw parts
    • 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
    • B29C48/395—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
    • B29C48/41—Intermeshing counter-rotating screws
    • 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
    • B29C48/535—Screws with thread pitch varying along the longitudinal axis

Description

【０００１】
【発明の属する技術分野】
本発明は、合成樹脂原料加工用の造粒用混練押出機に関し、特に、スクリュの下流部に導入穴と排出孔を設け、下流部の先端から溶融樹脂を排出することにより製品品質を向上させ、スペース効率を向上させるための新規な改良に関する。
【０００２】
【従来の技術】
一般に、合成装置により生産された合成樹脂原料は、合成樹脂としての特性の均質化および改質のために溶融混練され、さらには、二次加工用材料として取扱いを容易にするためにペレットに造粒されている。このような加工処理のために、多くの場合、二軸スクリュ式の造粒用混練押出機を中核機とする合成樹脂原料加工装置が使用され、大容量の連続加工処理が行われている。大容量処理を可能とする大型の造粒用混練押出機としては、スクリュの両端を回転可能に支持された構成が採用されている。図９及び図１０は、従来より使用されている一般的な二軸スクリュ式の造粒用混練押出機を示している。
【０００３】
図９において、符号１で示されるものは二軸スクリュ式の造粒用混練押出機であり、造粒用混練押出機１は長尺筒形状のシリンダ２と、シリンダ２内に非噛合い状態で平行配置されるとともに回転自在に挿入された２本のスクリュ３と、により構成されている。前記スクリュ３は、両端部間にスクリュフライトが形成され、上流すなわち図９の左側から下流すなわち右方向へ搬送部４、溶融混練部５、混練度調整リング部６、脱揮部７および排出部８により構成されている。また、このスクリュ３の上流端には後述する駆動装置との連結部９が、下流端には回転支持部１０が形成されている。
【０００４】
前記各スクリュ３を平行に配置して回転自在に内包する前記シリンダ２は、複数のブロックを連結して構成されるとともに、スクリュ３の前記搬送部４の上流部上方に開口する原料供給口１１、前記脱揮部５の上方に開口する脱揮口１２、前記排出部８の一方の外側面方向、図９では手前方向に開口する排出口１１が形成されている。また、このシリンダ２の上流端は、連結ブロック１３を介して後述する駆動装置に連結され、下流端には支持ブロック１４が設けられ、前記スクリュ３の回転支持部１０が軸シール材１５および軸受１６を介して回転自在に支持されている。すなわち、２本の前記スクリュ３は、それぞれ上流端を駆動装置により、下流端を前記軸受１６により、それぞれ支持されて回転駆動される。
【０００５】
前記造粒用混練押出機１は、図１０に示されるように、合成樹脂原料加工装置２０の一部を構成し、上流端が駆動装置２１を介して駆動動力源２２に連結されている。すなわち、前記スクリュ３の連結部９が軸方向に配置された駆動装置２１、さらには駆動動力源２２に回転駆動可能に連結支持されている。また、前記シリンダ２の排出口１７には、排出口１７面に鉛直方向すなわち前記造粒用混練押出機１の軸方向に対し直角方向に、ギァポンプ２３、濾過装置２６および水中造粒装置２７が順次一直線状に連結して配置されている。さらに、このギァポンプ２３には、ギァの軸方向にギァポンプ駆動装置２４を介してギァポンプ駆動動力源２５が連結されている。なお、前記造粒用混練押出機１の原料供給口１１にはホッパ２８および図示しない樹脂原料供給装置が、脱揮口１２には図示しない脱揮装置が、それぞれ連結されている。
【０００６】
以上のように構成された造粒用混練押出機１および合成樹脂原料加工装置２０において、合成樹脂原料の造粒加工が以下のように行われる。すなわち、合成樹脂原料加工装置２０の全ての運転条件が整った状態で、駆動動力源２２、ギァポンプ駆動動力源２５および水中造粒装置２７の駆動動力源を起動し、ホッパ２８から造粒用混練押出機１へ合成樹脂原料を供給する。造粒用混練押出機１において、原料供給口１１からシリンダ２内に供給された合成樹脂原料は、回転するスクリュ３により順次下流方向へ輸送される。原料供給口１１から供給された合成樹脂原料は、搬送部４により溶融混練部５へ輸送され、混練度調整リング６に設けられた図示しない混練度調節装置により調節されながら、溶融混練部５において溶融混練される。その後、溶融状態の合成樹脂原料は、脱揮部７において揮発成分が脱揮され、排出部８に達し、排出口１７から排出される。排出口１７から排出された合成樹脂原料は、ギァポンプ２３により昇圧され、濾過装置２６により不純物を濾過され、ダイを介して水中造粒装置２７へ押出され、ペレット状に造粒される。
【０００７】
【発明が解決しようとする課題】
従来の造粒用混練押出機は、以上のように実施されていたため、次のような課題が存在していた。
(1) まず、造粒用混練押出機において、スクリュの下流端が軸受により回転支持されていることにより、溶融状態の合成樹脂原料をシリンダの下流端軸方向すなわち直線方向へ排出できず、シリンダの一方の側面に排出口を設け、この排出口から排出している。その結果、２本のスクリュのそれぞれに沿って輸送されてきた合成樹脂原料は、輸送経路を排出口へ向けて９０度曲げることで、輸送経路に長短の差が生じて溶融温度に差が発生して均一性が低下し、製品品質を低下させる原因となっていた。
【０００８】
(2) また、造粒用混練押出機、駆動装置および駆動動力源を直線的に配置しているが、造粒用混練押出機の下流端においてギァポンプ、濾過装置および水中造粒装置を９０度折り曲げてＬ字状に配置しているため、加工装置を設置した建屋のスペース効率が低下していた。
【０００９】
本発明は、以上のような課題を解決するためになされたものであり、特に、スクリュの下流部に導入穴と押出孔を設け、下流部の先端から溶融樹脂を排出することにより製品品質を向上させ、スペース効率を向上させるようにした造粒用混練押出機を提供することを目的とする。
【００１０】
【課題を解決するための手段】
本発明による造粒用混練押出機は、長尺筒形状のシリンダと、前記シリンダ内に回転自在に挿入されたスクリュと、により構成された造粒用混練押出機において、前記スクリュの下流部の軸心に直線状に形成された排出孔と、前記下流部の周面から前記排出孔に連通する導入穴とを有し、前記スクリュにより送られた溶融樹脂は前記導入穴及び排出孔を経て前記下流部側から押出されるようにした造粒用混練押出機において、前記スクリュの両端が軸受を介して軸支されていると共に、前記スクリュは一対よりなる構成であり、また、前記下流部にギァポンプ、濾過装置および水中造粒装置を、それぞれの軸心を一致させて一直線状に順次配置した構成であり、また、前記導入穴の穴方向は、前記スクリュの半径方向とは異なる方向に形成されている構成であり、また、前記各スクリュの下流部の軸受は前記各下流部の軸方向における同一位置に配置されている構成であり、また、前記スクリュの下流部の軸受は前記各下流部の軸方向における異なる位置に配置されている構成である。
【００１１】
【発明の実施の形態】
以下、図面と共に本発明による二軸スクリュ式の造粒用混練押出機の好適な実施の形態について説明する。尚、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。
【００１２】
図１において、符号１で示されるものは二軸スクリュ式の造粒用混練押出機であり、造粒用混練押出機１は長尺筒形状のシリンダ２と、シリンダ２内に非噛合い状態で平行配置されるとともに回転自在に挿入された２本のスクリュ３と、により構成されている。前記スクリュ３は、両端部間にスクリュフライトが形成され、上流すなわち図１の左側から下流すなわち右方向へ搬送部４、溶融混練部５、混練度調整リング部６、脱揮部７および排出部８により構成されている。また、このスクリュ３の上流端には後述する駆動装置との連結部９が、下流部には回転支持部１０が形成されている。
【００１３】
さらに、このスクリュ３には、図２および図３に示されるように、排出部８の下流部３Ａの軸心部から回転支持部１０の先端面の開口５０ａへ連通する排出孔５０が形成され、排出部８の下流部３Ａのスクリュ３の溝底から前記排出孔５０に連通する複数の導入穴６０が形成されている。前記回転支持部１０の先端は、後続の機器装置、すなわちギァポンプに連通する合成樹脂原料の流路に連通されている。なお、この導入穴６０の長手方向は、図３に示されるようにスクリュ３の半径方向ｒとは異なる方向に形成されている。
【００１４】
前記各スクリュ３を平行に配置して回転自在に内蔵する前記シリンダ２は、複数のブロックを連結して構成されるとともに、スクリュ３の前記搬送部４の上流部上方に開口する原料供給口１１および前記脱揮部７の上方に開口する脱揮口１２が形成されている。また、このシリンダ２の上流端は、連結ブロック１３を介して後述する駆動装置に連結され、下流端には支持ブロック１４を介して後続の機器装置に連結されている。なお、この支持ブロック１４では、前記スクリュ３の回転支持部１０が軸シール材１５および軸受７０を介して回転自在に支持されている。
【００１５】
前記造粒用混練押出機１は、図４に示されるように、合成樹脂原料加工装置２０の一部を構成し、上流端が駆動装置２１を介して駆動動力源２２に連結されている。すなわち、前記スクリュ３の連結部９が軸方向に配置された駆動装置２１さらには駆動動力源２２に回転駆動可能に連結支持されている。また、前記造粒用混練押出機１の下流端には、造粒用混練押出機１と軸心を一致させて一直線状に配置されたギァポンプ２３、濾過装置２６および水中造粒装置２７が順次連結して配置されている。また、ギァポンプ２３には、ギァの軸方向にギァポンプ駆動装置２４を介してギァポンプ駆動動力源２５が連結されている。なお、前記造粒用混練押出機１の原料供給口１１にはホッパ２８および図示しない樹脂原料供給装置が、脱揮口１２には図示しない脱揮装置が、それぞれ連結されている。
【００１６】
以上のように構成された造粒用混練押出機１および合成樹脂原料加工装置２０において、合成樹脂原料の造粒加工が以下のように行われる。すなわち、合成樹脂原料加工装置２０の全ての運転条件が整った状態で、駆動動力源２２、ギァポンプ駆動動力源２５および水中造粒装置２７の駆動動力源を起動し、ホッパ２８から造粒用混練押出機１へ合成樹脂原料を供給する。造粒用混練押出機１において、原料供給口１１からシリンダ２内に供給された合成樹脂原料は、回転するスクリュ３により順次下流方向へ輸送される。
【００１７】
原料供給口１１から供給された合成樹脂原料は、搬送部４により溶融混練部５へ輸送され、混練度調整リング部６の箇所に設けられた図示しない混練度調節装置により調節されながら溶融混練部５において溶融混練される。その後、溶融状態の合成樹脂原料は、脱揮部７において揮発成分を脱揮され、排出部８に達し、複数の導入穴６０から回転支持部１０内部の排出孔５０及び開口５０ａを経てスクリュ３の軸方向へ排出される。この排出孔５０から排出された合成樹脂原料は、ギァポンプ２３により昇圧され、濾過装置２６により不純物を濾過され、ダイを介して水中造粒装置２７へ押出され、ペレット状に造粒される。
【００１８】
図５に示されるものは、本発明による造粒用混練押出機の他の形態であり、図１に示される前記スクリュ１２の最下流部の排出部８フライト構造を変えて構成し、溶融混練性を向上させている。
【００１９】
図６から図８に示されるものは、前記スクリュ３の回転支持部１０における前記軸受７０の配置例を示しており、図６では、２本の前記スクリュ３において、同一位置に並べて配置した形態、図７では、位置をずらせて配置した形態、図８では、位置をずらすとともに２個づつの軸受７０を配置した形態をそれぞれ示している。図６の配置では、スクリュ３の回転支持部１０を短く構成でき、図７の配置では、スクリュ３の軸心間距離を小さくあるいは回転支持部１０を太く構成でき、図８の配置では、図７と同様に軸心間距離を小さくあるいは回転支持部１０を太く構成できると共に、スクリュ３に大きな負荷が懸かる場合に対応可能な構成である。また、各スクリュ３の下流部３Ａを軸受７０で支持した場合について述べたが、実際には、図１のように、各スクリュ３の両端が軸受７０により支持されている。
【００２０】
【発明の効果】
本発明による二軸スクリュ式の造粒用混練押出機は、以上のように構成されていることにより、以下のような効果を得ることができる。
(1) スクリュの下流部の軸心先端面開口へ連通する排出孔が形成され、スクリュの溝底からこの排出孔に連通する複数の導入孔が形成されていることにより、溶融樹脂が、従来のように横方向に曲折されずに直線状に排出されるため、製品品質低下の原因、および滞留による製品品質低下の原因が解消され、溶融原料の均一性が確保され、製品品質が向上する。
(2) 溶融原料がスクリュの軸方向へ直線状に排出されることにより、造粒用混練押出機の下流側にギァポンプ、濾過装置および水中造粒装置を、軸心を一致させて一直線状に順次配置して連結し、合成樹脂原料加工装置全体を一直線状に構成することが可能になったため、従来構成と異なって設置上のスペース効率を向上させることができる。
【図面の簡単な説明】
【図１】 本発明による造粒用混練押出機の平面断面図である。
【図２】 図１におけるスクリュ下流部の部分拡大図である。
【図３】 図２における矢視Ａ−Ａ断面図である。
【図４】 本発明による造粒用混練押出機を用いた加工装置の平面配置図である。
【図５】 本発明による造粒用混練押出機の他の形態を示す平面断面図である。
【図６】 図１および図５におけるスクリュ下流部の軸受の配置例を示す構成図である。
【図７】 図６の他の形態を示す構成図である。
【図８】 図６の他の形態を示す構成図である。
【図９】 従来の二軸スクリュ式の造粒用混練押出機を示す平面断面図である。
【図１０】 従来の二軸スクリュ式造粒用混練押出機で構成される加工装置の平面配置図である。
【符号の説明】
１ 造粒用混練押出機
２ シリンダ
３ スクリュ
３Ａ 下流部
２０ 合成樹脂原料加工装置
２３ ギァポンプ
２６ 濾過装置 ２７ 水中造粒装置
５０ 排出孔
６０ 導入穴
７０ 軸受[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a granulation kneading extruder for processing synthetic resin raw materials, and in particular, improves the product quality by providing an introduction hole and a discharge hole in the downstream part of the screw and discharging the molten resin from the tip of the downstream part. And new improvements to improve space efficiency.
[0002]
[Prior art]
In general, a synthetic resin raw material produced by a synthesis apparatus is melt-kneaded for homogenization and modification of characteristics as a synthetic resin, and further formed into pellets for easy handling as a secondary processing material. It is grained. For such processing, in many cases, a synthetic resin raw material processing apparatus having a twin screw type granulation kneading extruder as a core machine is used, and a large capacity continuous processing is performed. As a large-sized granulation kneading extruder capable of large-capacity processing, a configuration in which both ends of a screw are rotatably supported is employed. FIG. 9 and FIG. 10 show a general twin screw type granulation kneading extruder conventionally used.
[0003]
In FIG. 9, a reference numeral 1 denotes a twin screw type granulation kneading extruder, and the granulation kneading extruder 1 is a long cylindrical cylinder 2 and a non-engaged state in the cylinder 2. The two screws 3 are arranged in parallel with each other and rotatably inserted. The screw 3 is formed with a screw flight between both ends, and is transported from the upstream side, that is, the left side of FIG. 8. In addition, a connecting portion 9 for connecting to a drive device described later is formed at the upstream end of the screw 3, and a rotation support portion 10 is formed at the downstream end.
[0004]
The cylinder 2 in which the screws 3 are arranged in parallel and rotatably included is configured by connecting a plurality of blocks, and the raw material supply port 11 that opens above the upstream portion of the conveying unit 4 of the screw 3. A devolatilization port 12 that opens above the devolatilization unit 5 and a discharge port 11 that opens in the direction of one outer surface of the discharge unit 8 and in the front direction in FIG. 9 are formed. Further, the upstream end of the cylinder 2 is connected to a driving device to be described later via a connecting block 13, a support block 14 is provided at the downstream end, and the rotation support portion 10 of the screw 3 is connected to the shaft seal material 15 and the bearing. 16 is rotatably supported via 16. That is, the two screws 3 are respectively rotatably driven while being supported by the driving device at the upstream end and by the bearing 16 at the downstream end.
[0005]
As shown in FIG. 10, the granulating kneading extruder 1 constitutes a part of a synthetic resin raw material processing apparatus 20, and an upstream end is connected to a driving power source 22 via a driving apparatus 21. That is, the connecting portion 9 of the screw 3 is connected and supported so as to be rotationally driven by a driving device 21 arranged in the axial direction, and further by a driving power source 22. The discharge port 17 of the cylinder 2 has a gear pump 23, a filtration device 26, and an underwater granulation device 27 perpendicular to the surface of the discharge port 17, that is, perpendicular to the axial direction of the granulating kneading extruder 1. They are sequentially connected in a straight line. Further, a gear pump driving power source 25 is connected to the gear pump 23 via a gear pump driving device 24 in the axial direction of the gear. A hopper 28 and a resin raw material supply device (not shown) are connected to the raw material supply port 11 of the granulating kneading extruder 1, and a devolatilization device (not shown) is connected to the devolatilization port 12.
[0006]
In the granulation kneading extruder 1 and the synthetic resin raw material processing apparatus 20 configured as described above, the synthetic resin raw material is granulated as follows. That is, in a state where all the operating conditions of the synthetic resin raw material processing apparatus 20 are in place, the driving power source 22, the gear pump driving power source 25, and the driving power source of the underwater granulator 27 are started, and granulation kneading is performed from the hopper 28. A synthetic resin raw material is supplied to the extruder 1. In the kneading extruder 1 for granulation, the synthetic resin raw material supplied into the cylinder 2 from the raw material supply port 11 is sequentially transported downstream by the rotating screw 3. The synthetic resin raw material supplied from the raw material supply port 11 is transported to the melt-kneading unit 5 by the transport unit 4 and is adjusted by a kneading degree adjusting device (not shown) provided in the kneading degree adjusting ring 6. Melted and kneaded. Thereafter, the molten synthetic resin raw material is devolatilized in the devolatilization unit 7, reaches the discharge unit 8, and is discharged from the discharge port 17. The synthetic resin material discharged from the discharge port 17 is pressurized by the gear pump 23, impurities are filtered by the filter device 26, extruded through the die to the underwater granulator 27, and granulated into pellets.
[0007]
[Problems to be solved by the invention]
Since the conventional granulating kneading extruder has been implemented as described above, the following problems existed.
(1) First, in the kneading and extruding machine for granulation, since the downstream end of the screw is rotationally supported by the bearing, the molten synthetic resin raw material cannot be discharged in the downstream end axial direction of the cylinder, that is, in the linear direction. A discharge port is provided on one side surface, and the discharge is made from this discharge port. As a result, the synthetic resin raw material that has been transported along each of the two screws bends the transport route 90 degrees toward the outlet, resulting in a difference in length between the transport route and a difference in melting temperature. As a result, the uniformity is lowered, which causes the product quality to deteriorate.
[0008]
(2) The granulating kneading extruder, the driving device and the driving power source are arranged linearly, but the gear pump, the filtering device and the underwater granulating device are installed at 90 degrees at the downstream end of the granulating kneading extruder. Since it was bent and arranged in an L shape, the space efficiency of the building in which the processing apparatus was installed was reduced.
[0009]
The present invention has been made to solve the above-described problems, and in particular, an introduction hole and an extrusion hole are provided in the downstream portion of the screw, and the molten resin is discharged from the tip of the downstream portion, thereby improving product quality. An object of the present invention is to provide a kneading and extruding machine for granulation which is improved and space efficiency is improved.
[0010]
[Means for Solving the Problems]
A granulation kneading extruder according to the present invention is a granulation kneading extruder comprising a long cylindrical cylinder and a screw rotatably inserted into the cylinder, and is provided at a downstream portion of the screw. It has a discharge hole formed linearly in the shaft center and an introduction hole communicating with the discharge hole from the peripheral surface of the downstream portion, and the molten resin sent by the screw passes through the introduction hole and the discharge hole. In the kneading and extruding machine for granulation that is extruded from the downstream portion side , both ends of the screw are pivotally supported via bearings, and the screw has a pair, and the downstream portion In addition, the gear pump, the filtration device, and the underwater granulation device are arranged in a straight line with their respective axes aligned, and the direction of the introduction hole is different from the radial direction of the screw. Formed Further, the downstream bearings of the screws are arranged at the same position in the axial direction of the downstream parts, and the downstream bearings of the screws are the downstream parts. Are arranged at different positions in the axial direction.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
DESCRIPTION OF EMBODIMENTS Hereinafter, preferred embodiments of a twin screw granulation kneading extruder according to the present invention will be described with reference to the drawings. Note that the same or equivalent parts as in the conventional example will be described using the same reference numerals.
[0012]
In FIG. 1, a reference numeral 1 denotes a twin screw type granulation kneading extruder, and the granulation kneading extruder 1 is a long cylindrical cylinder 2 and a non-engaged state in the cylinder 2. The two screws 3 are arranged in parallel with each other and rotatably inserted. The screw 3 is formed with screw flights between both end portions thereof, upstream, that is, from the left side in FIG. 1 to the downstream side, that is, in the right direction. 8. Further, a connecting portion 9 for connecting to a drive device described later is formed at the upstream end of the screw 3, and a rotation support portion 10 is formed at the downstream portion.
[0013]
Further, as shown in FIGS. 2 and 3, the screw 3 is formed with a discharge hole 50 that communicates from the axial center portion of the downstream portion 3 </ b> A of the discharge portion 8 to the opening 50 a on the distal end surface of the rotation support portion 10. A plurality of introduction holes 60 communicating with the discharge hole 50 from the groove bottom of the screw 3 in the downstream part 3A of the discharge part 8 are formed. The tip of the rotation support portion 10 is communicated with a flow path of a synthetic resin raw material that communicates with a subsequent device, that is, a gear pump. The longitudinal direction of the introduction hole 60 is formed in a direction different from the radial direction r of the screw 3 as shown in FIG.
[0014]
The cylinder 2 in which the screws 3 are arranged in parallel and rotatably incorporated is constituted by connecting a plurality of blocks, and the raw material supply port 11 opened above the upstream portion of the conveying unit 4 of the screw 3. Further, a devolatilization port 12 opening above the devolatilization unit 7 is formed. In addition, the upstream end of the cylinder 2 is connected to a driving device to be described later via a connecting block 13, and the downstream end is connected to a subsequent device device via a support block 14. In the support block 14, the rotation support portion 10 of the screw 3 is rotatably supported via a shaft seal material 15 and a bearing 70.
[0015]
As shown in FIG. 4, the granulating kneading extruder 1 constitutes a part of a synthetic resin raw material processing apparatus 20, and an upstream end is connected to a driving power source 22 via a driving apparatus 21. That is, the connecting portion 9 of the screw 3 is connected and supported by a driving device 21 and an driving power source 22 arranged in the axial direction so as to be rotationally driven. Further, at the downstream end of the granulation kneading extruder 1, a gear pump 23, a filtration device 26, and an underwater granulation device 27, which are arranged in a straight line with their axis centers coincided with the granulation kneading extruder 1, are sequentially provided. They are connected and arranged. A gear pump driving power source 25 is connected to the gear pump 23 via a gear pump driving device 24 in the axial direction of the gear. A hopper 28 and a resin raw material supply device (not shown) are connected to the raw material supply port 11 of the granulating kneading extruder 1, and a devolatilization device (not shown) is connected to the devolatilization port 12.
[0016]
In the granulation kneading extruder 1 and the synthetic resin raw material processing apparatus 20 configured as described above, the synthetic resin raw material is granulated as follows. That is, in a state where all the operating conditions of the synthetic resin raw material processing apparatus 20 are in place, the driving power source 22, the gear pump driving power source 25, and the driving power source of the underwater granulator 27 are started, and granulation kneading is performed from the hopper 28. A synthetic resin raw material is supplied to the extruder 1. In the kneading extruder 1 for granulation, the synthetic resin raw material supplied into the cylinder 2 from the raw material supply port 11 is sequentially transported downstream by the rotating screw 3.
[0017]
The synthetic resin raw material supplied from the raw material supply port 11 is transported to the melt kneading unit 5 by the transport unit 4 and adjusted by a kneading degree adjusting device (not shown) provided at the kneading degree adjusting ring unit 6 while being melted and kneaded. 5 is melt-kneaded. Thereafter, the molten synthetic resin raw material is devolatilized in the devolatilization unit 7, reaches the discharge unit 8, passes through the discharge holes 50 and the openings 50 a inside the rotation support unit 10 from the plurality of introduction holes 60, and then the screw 3. It is discharged in the axial direction. The synthetic resin raw material discharged from the discharge hole 50 is pressurized by the gear pump 23, the impurities are filtered by the filter device 26, extruded through the die to the underwater granulator 27, and granulated into pellets.
[0018]
FIG. 5 shows another form of the kneading and extruding machine for granulation according to the present invention, which is constructed by changing the discharge part 8 flight structure at the most downstream part of the screw 12 shown in FIG. Improves sex.
[0019]
6 to 8 show examples of the arrangement of the bearings 70 in the rotation support portion 10 of the screw 3, and in FIG. 6, the two screws 3 are arranged side by side at the same position. 7 shows a form in which the positions are shifted, and FIG. 8 shows a form in which the positions are shifted and two bearings 70 are arranged. In the arrangement of FIG. 6, the rotation support portion 10 of the screw 3 can be configured to be short. In the arrangement of FIG. 7, the distance between the axes of the screw 3 can be reduced or the rotation support portion 10 can be configured to be thick. In the same way as in FIG. 7, the distance between the shaft centers can be reduced or the rotation support portion 10 can be made thicker, and the screw 3 can be applied to a large load. Moreover, although the case where the downstream part 3A of each screw 3 was supported by the bearing 70 was described, in fact, both ends of each screw 3 are supported by the bearing 70 as shown in FIG.
[0020]
【The invention's effect】
The biaxial screw type granulation kneading extruder according to the present invention can obtain the following effects by being configured as described above.
(1) A discharge hole that communicates with the opening at the tip end surface of the axial center of the downstream portion of the screw is formed, and a plurality of introduction holes that communicate with the discharge hole from the groove bottom of the screw are formed. In this way, the product is discharged in a straight line without being bent in the horizontal direction, eliminating the cause of product quality deterioration and the cause of product quality deterioration due to stagnation, ensuring uniformity of the molten material, and improving product quality. .
(2) When the molten raw material is discharged linearly in the axial direction of the screw, a gear pump, a filtration device and an underwater granulator are aligned in a straight line with the shaft center aligned on the downstream side of the kneading extruder for granulation. Since the entire synthetic resin raw material processing apparatus can be configured in a straight line by sequentially arranging and connecting, the space efficiency in installation can be improved unlike the conventional configuration.
[Brief description of the drawings]
FIG. 1 is a plan sectional view of a kneading extruder for granulation according to the present invention.
2 is a partially enlarged view of a screw downstream portion in FIG. 1. FIG.
3 is a cross-sectional view taken along the line AA in FIG. 2;
FIG. 4 is a plan layout view of a processing apparatus using a granulation kneading extruder according to the present invention.
FIG. 5 is a plan sectional view showing another embodiment of the granulating kneading extruder according to the present invention.
6 is a configuration diagram showing an example of arrangement of bearings in the downstream portion of the screw in FIGS. 1 and 5. FIG.
7 is a configuration diagram showing another embodiment of FIG. 6. FIG.
8 is a configuration diagram showing another embodiment of FIG. 6. FIG.
FIG. 9 is a plan sectional view showing a conventional twin screw type granulation kneading extruder.
FIG. 10 is a plan layout view of a processing apparatus composed of a conventional twin-screw granulation kneading extruder.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Kneading extruder for granulation 2 Cylinder 3 Screw 3A Downstream part 20 Synthetic-resin raw material processing apparatus 23 Gear pump 26 Filtration apparatus 27 Underwater granulation apparatus 50 Discharge hole 60 Introduction hole 70 Bearing

Claims (5)

長尺筒形状のシリンダ(2)と、前記シリンダ(2)内に回転自在に挿入されたスクリュ(3)と、により構成された造粒用混練押出機において、前記スクリュ(3)の下流部(3A)の軸心に直線状に形成された排出孔(50)と、前記下流部(3A)の周面から前記排出孔(50)に連通する導入穴(60)とを有し、前記スクリュ(3)により送られた溶融樹脂は前記導入穴(60)及び排出孔(50)を経て前記下流部(3A)側から押出される構成とした造粒用混練押出機において、前記スクリュ (3) の両端が軸受 (70) を介して軸支されていると共に、前記スクリュ (3) は一対よりなることを特徴とする造粒用押出機。 In the kneading and extruding machine for granulation constituted by a long cylindrical cylinder (2) and a screw (3) rotatably inserted into the cylinder (2), a downstream portion of the screw (3) A discharge hole (50) formed linearly in the axial center of (3A), and an introduction hole (60) communicating with the discharge hole (50) from the peripheral surface of the downstream portion (3A), in the molten resin sent by the screw (3) is the inlet hole (60) and the discharge hole (50) granulation kneading extruder configured to be extruded from the downstream portion (3A) side through the screw ( A granulating extruder characterized in that both ends of 3) are pivotally supported via bearings (70), and the screw (3) is a pair. 前記下流部(3A)にギァポンプ(23)、濾過装置(26)および水中造粒装置(27)を、それぞれの軸心を一致させて一直線状に順次配置したことを特徴とする請求項１記載の造粒用混練押出機。  The gear pump (23), the filtration device (26), and the underwater granulation device (27) are sequentially arranged in a straight line with their respective axes aligned in the downstream portion (3A). Kneading extruder for granulation. 前記導入穴(60)の穴方向は、前記スクリュ(3)の半径方向(r)とは異なる方向に形成されていることを特徴とする請求項１又は２記載の造粒用混練押出機。  The kneading and extruding machine for granulation according to claim 1 or 2, wherein a hole direction of the introduction hole (60) is formed in a direction different from a radial direction (r) of the screw (3). 前記各スクリュ(3)の下流部(3A)の軸受(70)は前記各下流部(3A)の軸方向における同一位置に配置されていることを特徴とする請求項１ないし３の何れかに記載の造粒用混練押出機。Wherein in any of claims 1 to 3, characterized in that it is arranged in the same position in the axial direction of the bearing (70) wherein each of the downstream portion (3A) of the downstream portion (3A) of each screw (3) The kneading extruder for granulation described. 前記スクリュ(3)の下流部(3A)の軸受(70)は前記各下流部(3A)の軸方向における異なる位置に配置されていることを特徴とする請求項１ないし３の何れかに記載の造粒用混練押出機。According to any one bearing (70) of the downstream portion (3A) is of claims 1 to 3, characterized in that are arranged at different positions in the axial direction of the respective downstream portions (3A) of said screw (3) Kneading extruder for granulation.
JP2001381514A 2001-12-14 2001-12-14 Kneading extruder for granulation Expired - Fee Related JP3738422B2 (en)

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EA013915B1 (en) * 2005-11-28 2010-08-30 Гала Индастриз, Инк. Apparatus and method for controlled pelletization processing
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