JP2004025669A - Vent hardware fitment for extruder, and extruder - Google Patents

Vent hardware fitment for extruder, and extruder Download PDF

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Publication number
JP2004025669A
JP2004025669A JP2002186429A JP2002186429A JP2004025669A JP 2004025669 A JP2004025669 A JP 2004025669A JP 2002186429 A JP2002186429 A JP 2002186429A JP 2002186429 A JP2002186429 A JP 2002186429A JP 2004025669 A JP2004025669 A JP 2004025669A
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Japan
Prior art keywords
screw
molding material
extruder
vent
cylinder
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JP2002186429A
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Japanese (ja)
Inventor
Seiji Okinaka
沖中　聖治
Masayuki Aoyama
青山　雅之
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Japan Steel Works Ltd
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Japan Steel Works Ltd
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Priority to JP2002186429A priority Critical patent/JP2004025669A/en
Publication of JP2004025669A publication Critical patent/JP2004025669A/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
    • B29C48/50—Details of extruders
    • B29C48/76—Venting, drying means; Degassing means
    • B29C48/765—Venting, drying means; Degassing means in the extruder apparatus
    • B29C48/766—Venting, drying means; Degassing means in the extruder apparatus in screw extruders
    • B29C48/767—Venting, drying means; Degassing means in the extruder apparatus in screw extruders through a degassing opening of a barrel
    • 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
    • B29B7/80—Component parts, details or accessories; Auxiliary operations
    • B29B7/84—Venting or degassing ; Removing liquids, e.g. by evaporating components
    • B29B7/845—Venting, degassing or removing evaporated components in devices with rotary stirrers
    • 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

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

Abstract

<P>PROBLEM TO BE SOLVED: To perform deaeration without generating vent-up and entrainment even when a highly viscous resin and a resin with a large amount of generated gas are plasticized. <P>SOLUTION: A vent hardware fitment 7 has an undercut section 8 covering a first screw 2 and a flange 9 being an extended part of the undercut section 8 and covering a part of a second screw 3. The end part 8a of the undercut section 8 is positioned below the upper face 1a of a cylinder 1, and the end part 9a of the flange 9 is positioned above the upper face 1a of the cylinder 1, and faces 12 from the end part 8a to the end part 9a are smoothly connected. An opening area is ensured in a vent hole 6 so that the entrainment caused by increasing in gas flow rate is not generated. Inner face treatment 10 for improving releasing properties of a molding material is applied on the faces 12, an end face 7b and an inner wall face 1b with which the molding material is brought into contact. <P>COPYRIGHT: (C)2004,JPO

Description

【０００１】
【発明の属する技術分野】
本発明は、可塑化された成形材料の脱気を行う押出機用ベント金物装置、およびこの押出機用ベント金物装置を取付可能な押出機に関する。
【０００２】
【従来の技術】
樹脂成形用の押出機は、周知のように、シリンダと該シリンダ内で駆動されるスクリュとから概略構成されている。また、これら押出機のうち、樹脂を可塑化する過程で樹脂から生じる水分、揮発分等を外部に逃すことのできるベント式のものが知られている。このようなベント式の押出機の一例の断面図を図２に示す。シリンダ１００には、図中矢印方向に回転する第１および第２のスクリュ１０２、１０３を収納するスクリュ受け孔１０４、１０５が形成されており、このスクリュ受け孔１０４、１０５は、樹脂から生じる水分、揮発分等を外部に逃すための脱気口１０６に連通している。脱気口１０６には、脱気された樹脂を再びシリンダ１００と第１のスクリュ１０２間に誘導するため、第１のスクリュ１０２の回転方向下流側にアンダーカット１０８が形成されたベント金物装置１０６が装着されている。
【０００３】
また、図３にベント式の押出機の他の例の断面図を示す。図３に示す押出機の構成は、図２で示す構造と基本的には同一であるが、取り付けられているベント金物装置２０８の形状が異なり、第１のスクリュ２０２側のアンダーカット部２０８が第１のスクリュ２０２の上面をほぼ覆うと共に、第２のスクリュ２０３の上面がこのベント金物装置２０７によって覆われている。そのため、シリンダ２０１に形成された脱気口２０６はこのベント金物装置２０７によりほぼ完全に覆われ、アンダーカット部２０８がわずかに外部と連通する状態で形成されている。各スクリュ２０２、２０３によって成形材料を可塑化する際に、この成形材料の揮発分等がこのアンダーカット部２０８を介して外部に脱気される。
【０００４】
【発明が解決しようとする課題】
しかしながら、以上のように構成されている従来の押出成形機における脱気方法は、次のような課題が存在していた。すなわち、図２の従来構成の場合は、脱気口が広くとられているため、不純物ガスを多く含む成形材料の脱気にはエントレインメント（成形材料塊の飛沫同伴）が防止されて好適であるが、高粘度の樹脂を可塑化する際には、アンダーカット部における喰い込み不良が発生し、ベントアップしやすい傾向があった。また、このベントアップにより滞留した樹脂が「やけ」を起こしたり、劣化してしまう場合があった。
【０００５】
また、図３の従来構成の場合、ベントアップを防止できる構造であり、不純物ガス発生が少ない成形材料のガス抜きには好適であるが、ガス量が多くなると、ベントアップ及びエントレインメントが発生してしまう場合があった。
【０００６】
そこで、本発明は、粘度の高い樹脂や、発生ガス量の多い樹脂を混練する場合においても、ベントアップやエントレインメントを生じることなく脱気することができる押出機用ベント金物装置、およびこの押出機用ベント金物装置を取付可能な押出機を提供することを目的とする。
【０００７】
【課題を解決するための手段】
上記目的を達成するため本発明の押出機用ベント金物装置は、スクリュの回転により成形材料を可塑化しつつ送り出す押出機の、前記スクリュを収納するシリンダの上部に取り付けられ、前記成形材料から発生した揮発分の脱気を行うための開口が形成された押出機用ベント金物装置において、端部がシリンダの上面よりも下方に位置し、少なくとも第１のスクリュの一部を覆うアンダーカット部と、前記アンダーカット部と一体的に形成され、前記アンダーカット部の端部側に向けて成形材料を移送するように回転する前記第１のスクリュと同方向に回転し、かつ、前記第１のスクリュに併設されている第２のスクリュの一部を覆い、端部がシリンダの上面よりも上方に位置するつばとを有し、前記第１のスクリュおよび前記第２のスクリュの上方に形成された空間と外部とを連通する脱気口の開口面積が、成形材料から発生し、前記脱気口を通過するガスの流速が所定の速度以下となる面積であることを特徴とする。
【０００８】
上記の通り構成された本発明の押出機用ベント金物装置は、第２のスクリュの一部を覆うつばが、第１のスクリュの一部を覆うアンダーカット部と一体的に形成され、かつ、つばの端部がシリンダの上面よりも上方に位置している。つまり、第２のスクリュの上方に形成された空間内で盛り上がった成形材料が引っ掛かってしまうことがない高さにつばの端部が位置しているので、食い込み不良が発生せず、ベントアップを起こしにくくすることができる。また、脱気口の開口面積が、成形材料から発生し、脱気口を通過するガスの流速が所定の速度以下となる面積であるため、この所定の速度を低く設定することで、脱気口からの成形材料塊の飛沫同伴、いわゆるエントレイメントの発生を防止することができる。
【０００９】
また、本発明の押出機用ベント金物装置は、少なくとも、アンダーカット部の端部からつばの端部との間を繋ぐ面と、ベント金物装置の端面と、空間に面するシリンダの内壁面とに、成形材料の剥離性が良好となる内面処理が施されているものであってもよく、この内面処理としては、セラミック、メッキ、テフロン等をコーティングするものであってもよい。このコーティングにより、成形材料がベント金物装置の表面に付着することにより生じる成形材料の「やけ」や劣化を防止することができる。
【００１０】
本発明の押出機は、スクリュの回転により成形材料を可塑化しつつ送り出す、本発明の押出機用ベント金物装置を前記スクリュを収納するシリンダの上部に取付可能な押出機であって、前記空間に面する前記シリンダの内壁面に、成形材料の剥離性が良好となる内面処理が施されていることを特徴とする。
【００１１】
上記の通りの本発明の押出機は、本発明の押出機用ベント金物装置を取り付けるとともに、成形材料に接触するシリンダの内壁面にセラミック、メッキ、テフロン等の内面処理が施されているため、ベントアップ、成形材料の「やけ」や劣化、さらには、エントレイメントを生じることなく、良好な状態で成形材料の可塑化を行うことができる。
【００１２】
【発明の実施の形態】
次に、本発明の実施の形態について図面を参照して説明する。
【００１３】
図１に、本実施形態の押出成形機における２軸式の押出機用ベント金物装置の一例の概略断面図を示す。なお、押出機１１の基本的な構成は、従来の押出機と同様であるため、その説明は省略する。また、本実施形態では、２軸式の押出機１１を用いているが、もちろん、これに限らず、１軸式や、３軸以上の多軸式のものを用いても構わない。
【００１４】
押出機１１のシリンダ１には、図中矢印ａ方向に回転する第１のスクリュ２、第１のスクリュ２と同方向に回転し、かつ、第１のスクリュ２に併設されている第２のスクリュ３のそれぞれを収納するスクリュ受け孔４、５が形成されており、また、その上面１ａ上にはベント金物装置７が取り付けられている。このベント金物装置７には、第１および第２のスクリュ２、３が回転することで混練されながら空間１３内へと搬送されてきた樹脂等の成形材料から生じる水分、揮発分等を外部に逃すための脱気口６が形成されている。この脱気口６は、脱気口６を通過する、可塑化時に成形材料から発生する水分、揮発分等のガス流速が、所定の速度以上にならないような開口面積に設定されている。この所定の速度としては、エントレイメント（成形材料塊の飛沫同伴）を生じない程度の速度とするのが好適である。
【００１５】
シリンダ１の上面１ａ上に取り付けられたベント金物装置７は、第１のスクリュ２を覆うようにして形成されたアンダーカット部８と、第２のスクリュ３の一部を覆うようにして一体的に形成された、アンダーカット部８の延長部であるつば９を有している。アンダーカット部８の端部８ａはシリンダ１の上面１ａより下方に、また、つば９の端部９ａはシリンダ１の上面１ａより上方に位置し、端部８ａから端部９ａまでの面１２は滑らかに繋がっている。すなわち、アンダーカット部８およびつば９の下面である面１２は、成形材料が搬送されてくる上流方向に向けて開いた形状となっており、第１および第２のスクリュ２、３上を矢印Ａ方向へと搬送される成形材料の良好な食い込みを促進し、ベントアップを起こしにくい形状となっている。
【００１６】
また、成形材料と接触する面１２、ベント金物装置７の端面７ｂ、および空間１３に面するシリンダ１の内壁面１ｂには、成形材料の付着を防止するための内面処理１０として、セラミック、メッキ、テフロン等、成形材料の剥離性が良好な特性のものがコーティングされている。
【００１７】
次に、本実施形態の押出機の動作について説明する。
【００１８】
シリンダ１内に供給された成形材料は、第１および第２のスクリュ２、３の矢印ａ方向への回転によって、可塑化される。第２のスクリュ３の周方向に盛り上がってきた成形材料は、つば９により押さえ込まれ、ベントアップすることなく、第１のスクリュ２へと搬送される。つまり、つば９の端部９ａは第２のスクリュ３から上方に十分離れた位置にあるため、盛り上がってきた成形材料が端部９ａで引っ掛かるといったことがない。端部９ａで引っ掛かることなくつば９の面１２に案内されながら第１のスクリュ２へと向けて第２のスクリュ３の周方向上部を移送される成形材料は、さらに、アンダーカット部８の面１２に案内されて第１のスクリュ２とスクリュ受け孔４との間に食い込んでいき、可塑化がなされる。なお、成形材料が接触する各面には、上述したように剥離性の高い内面処理１０が施されているため、以上の工程において、成形材料が壁面に付着しての「やけ」や劣化は生じにくくなっている。
【００１９】
以上の工程において成形材料から生じた水分、揮発分等のガスは、脱気口６から外部に排出される。脱気口６は、排出されるガスの流速が上がりすぎないように、十分な大きな開口面積が確保されているので、エントレイメントの発生も抑止されている。
【００２０】
以上説明したように、つば９を有し、内面処理１０が施された本実施形態のベント金物装置７を装着した押出機１１は、発生ガス量の多い成形材料、粘度の高い成形材料、高フィラー充填の成形材料、あるいはゴム質の成形材料等の可塑化を行う場合においても、成形材料がベントアップ、滞留することがないため、成形材料の「やけ」や劣化が生じにくく、さらに、脱気口６から排出されるガスの流速が必要以上に上がることがないので、エントレイメントの発生も防止することができる。
【００２１】
【発明の効果】
以上説明したように本発明のベント金物装置は、つばが、第２のスクリュの一部を覆い、アンダーカット部と一体的に形成され、かつ、その端部が、シリンダの空間内で盛り上がった成形材料が引っ掛かってしまうことのない高さに位置している。このため、成形材料のベントアップを生じない。また、脱気口の開口面積を広くとることで脱気口を通過するガスの流速を抑えているため、エントレイメントの発生も抑制されている。さらに、成形材料が接触する面に、成形材料の剥離性が良好な内面処理を施しているため、成形材料の「やけ」や劣化も生じにくい構成となっている。
【図面の簡単な説明】
【図１】本発明による押出機用ベント金物装置の一実施形態の概略断面図である。
【図２】従来の押出機用ベント金物装置の一例の概略断面図である。
【図３】従来の、他の押出機用ベント金物装置の概略断面図である。
【符号の説明】
１　　シリンダ
１ａ　　上面
１ｂ　　内壁面
２　　第１のスクリュ
３　　第２のスクリュ
４、５　　スクリュ受け孔
６　　脱気口
７　　ベント金物装置
７ａ　　上面
７ｂ　　端面
８　　アンダーカット部
８ａ　　端部
９ａ　　端部
１０　　内面処理
１１　　押出機
１２　　面
１３　　空間[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a vent hardware for an extruder for degassing a plasticized molding material, and an extruder to which the vent hardware for the extruder can be attached.
[0002]
[Prior art]
As is well known, an extruder for resin molding generally includes a cylinder and a screw driven in the cylinder. Among these extruders, vent-type extruders that can release moisture, volatile matter, and the like generated from the resin in the process of plasticizing the resin to the outside are known. A cross-sectional view of an example of such a vent-type extruder is shown in FIG. The cylinder 100 is provided with screw receiving holes 104 and 105 for accommodating the first and second screws 102 and 103 which rotate in the direction of the arrow in the figure. The screw receiving holes 104 and 105 are provided with water generated from resin. , A volatile component and the like to the outside. A vent fitting device 106 in which an undercut 108 is formed on the downstream side in the rotation direction of the first screw 102 in order to guide the degassed resin again between the cylinder 100 and the first screw 102, Is installed.
[0003]
FIG. 3 is a cross-sectional view of another example of a vent type extruder. The configuration of the extruder shown in FIG. 3 is basically the same as the configuration shown in FIG. 2, but the shape of the attached vent hardware 208 is different, and the undercut portion 208 on the first screw 202 side is The upper surface of the first screw 202 is almost covered, and the upper surface of the second screw 203 is covered by the vent hardware 207. Therefore, the vent hole 206 formed in the cylinder 201 is almost completely covered by the vent metal fitting device 207, and the undercut portion 208 is formed in a state of slightly communicating with the outside. When the molding material is plasticized by the screws 202 and 203, the volatile components of the molding material are degassed to the outside via the undercut portion 208.
[0004]
[Problems to be solved by the invention]
However, the degassing method in the conventional extruder configured as described above has the following problems. That is, in the case of the conventional configuration shown in FIG. 2, since the deaeration port is widened, entrainment (entrainment of the molding material lump) is preferably prevented in deaeration of the molding material containing a large amount of impurity gas. However, when plasticizing a high-viscosity resin, poor biting occurred in the undercut portion, which tended to easily vent up. In addition, the resin that has accumulated due to the venting may cause "burn" or deteriorate.
[0005]
Further, in the case of the conventional configuration shown in FIG. 3, the structure is capable of preventing vent-up, and is suitable for degassing a molding material that generates little impurity gas. However, when the gas amount is large, vent-up and entrainment occur. There was a case.
[0006]
Therefore, the present invention provides a vent metal device for an extruder, which can degas without causing vent-up or entrainment even when kneading a resin having a high viscosity or a resin having a large amount of generated gas, and an extruder. An object of the present invention is to provide an extruder to which a vent metal fitting for a machine can be attached.
[0007]
[Means for Solving the Problems]
In order to achieve the above object, a vent metal fitting for an extruder of the present invention is mounted on an upper part of a cylinder for accommodating the screw of an extruder that plasticizes and sends out a molding material by rotation of the screw, and is generated from the molding material. In an extruder vent fitting device in which an opening for degassing volatiles is formed, an end portion is located below the upper surface of the cylinder, and an undercut portion covering at least a part of the first screw; The first screw is formed integrally with the undercut portion, rotates in the same direction as the first screw that rotates so as to transfer a molding material toward an end of the undercut portion, and And a flange that covers a part of the second screw attached to the cylinder and has an end located above the upper surface of the cylinder. The first screw and the second screw The opening area of the deaeration port that connects the space formed above the outside and the outside is an area that is generated from the molding material and the flow velocity of the gas passing through the deaeration port is equal to or less than a predetermined velocity. And
[0008]
In the vent hardware for an extruder of the present invention configured as described above, the collar covering a part of the second screw is formed integrally with an undercut portion covering a part of the first screw, and The end of the collar is located above the top surface of the cylinder. In other words, since the end of the brim is located at a height where the raised molding material is not caught in the space formed above the second screw, biting failure does not occur and venting up is performed. It can be hard to wake up. Further, since the opening area of the deaeration port is an area generated from the molding material and the flow velocity of the gas passing through the deaeration port is equal to or less than a predetermined speed, the deaeration is set by setting the predetermined speed low. It is possible to prevent the entrainment of the molding material lump from the mouth, that is, the occurrence of entrainment.
[0009]
Further, the vent metal device for an extruder of the present invention has at least a surface connecting the end of the undercut portion to the end of the collar, an end surface of the vent metal device, and an inner wall surface of the cylinder facing the space. May be subjected to an inner surface treatment for improving the releasability of the molding material. The inner surface treatment may be a coating of ceramic, plating, Teflon, or the like. This coating can prevent "burn" and deterioration of the molding material caused by the molding material adhering to the surface of the vent hardware.
[0010]
The extruder of the present invention is an extruder which can attach the vent metal device for an extruder of the present invention to the upper part of a cylinder housing the screw, while plasticizing and sending out a molding material by rotation of the screw, wherein The inner wall surface of the facing cylinder is subjected to an inner surface treatment for improving the releasability of the molding material.
[0011]
As described above, the extruder of the present invention is equipped with the vent hardware for the extruder of the present invention, and the inner wall surface of the cylinder in contact with the molding material is subjected to an inner surface treatment such as ceramic, plating, and Teflon. It is possible to plasticize the molding material in a good state without venting up, "burn" or deterioration of the molding material, and further without causing entrainment.
[0012]
BEST MODE FOR CARRYING OUT THE INVENTION
Next, embodiments of the present invention will be described with reference to the drawings.
[0013]
FIG. 1 shows a schematic cross-sectional view of an example of a vent metal device for a twin-screw extruder in the extruder of the present embodiment. Note that the basic configuration of the extruder 11 is the same as that of a conventional extruder, and a description thereof will be omitted. In the present embodiment, the twin-screw extruder 11 is used. However, the present invention is not limited to this, and a single-screw extruder or a multi-screw extruder having three or more screws may be used.
[0014]
In the cylinder 1 of the extruder 11, a first screw 2 that rotates in the direction of arrow a in the figure, a second screw that rotates in the same direction as the first screw 2, and is provided alongside the first screw 2 is provided. Screw receiving holes 4 and 5 for accommodating each of the screws 3 are formed, and a vent hardware device 7 is mounted on the upper surface 1a. In this vent metal apparatus 7, moisture and volatile matter generated from a molding material such as a resin which is conveyed into the space 13 while being kneaded by rotation of the first and second screws 2 and 3 are externally supplied. A deaeration port 6 for escape is formed. The deaeration port 6 is set to have an opening area such that the gas flow rate of water, volatile matter, and the like generated from the molding material during plasticization and passing through the deaeration port 6 does not exceed a predetermined speed. The predetermined speed is preferably a speed that does not cause entrainment (entrainment of a molding material lump).
[0015]
The vent hardware 7 mounted on the upper surface 1a of the cylinder 1 is integrated with an undercut portion 8 formed so as to cover the first screw 2 and a part of the second screw 3. And a collar 9 which is an extension of the undercut portion 8. The end 8a of the undercut 8 is located below the upper surface 1a of the cylinder 1, the end 9a of the collar 9 is located above the upper surface 1a of the cylinder 1, and the surface 12 from the end 8a to the end 9a is They are connected smoothly. That is, the undercut portion 8 and the surface 12 which is the lower surface of the collar 9 have a shape that is open toward the upstream direction in which the molding material is conveyed, and arrows on the first and second screws 2 and 3. It promotes good penetration of the molding material conveyed in the direction A, and has a shape that does not easily cause vent up.
[0016]
In addition, the surface 12, which contacts the molding material, the end surface 7b of the vent hardware 7, and the inner wall surface 1b of the cylinder 1, which faces the space 13, are treated with ceramic, plating, etc. , Teflon, etc. are coated with a material having good releasability of the molding material.
[0017]
Next, the operation of the extruder according to the present embodiment will be described.
[0018]
The molding material supplied into the cylinder 1 is plasticized by the rotation of the first and second screws 2 and 3 in the direction of the arrow a. The molding material that has risen in the circumferential direction of the second screw 3 is pressed by the collar 9 and is conveyed to the first screw 2 without venting up. That is, since the end 9a of the collar 9 is located sufficiently far upward from the second screw 3, the raised molding material does not catch on the end 9a. The molding material transported upward in the circumferential direction of the second screw 3 toward the first screw 2 while being guided by the surface 12 of the collar 9 without being caught at the end 9 a further includes a surface of the undercut portion 8. The screw is guided by 12 and bites between the first screw 2 and the screw receiving hole 4 to be plasticized. In addition, since the inner surface treatment 10 having high releasability is performed on each surface with which the molding material comes into contact as described above, in the above process, the “burn” or deterioration due to the molding material adhering to the wall surface is prevented. Less likely to occur.
[0019]
Gases such as moisture and volatile matter generated from the molding material in the above steps are discharged to the outside through the deaeration port 6. The deaeration port 6 has a sufficiently large opening area so that the flow rate of the discharged gas is not excessively increased, so that occurrence of entrainment is also suppressed.
[0020]
As described above, the extruder 11 equipped with the vent metal apparatus 7 of the present embodiment having the flange 9 and the inner surface treatment 10 is provided with a molding material having a large amount of generated gas, a molding material having a high viscosity, Even when plasticizing a filler-filled molding material or a rubber-like molding material, the molding material does not vent up or stay, so that "burning" or deterioration of the molding material is less likely to occur, and furthermore, demolding is difficult. Since the flow velocity of the gas discharged from the air port 6 does not increase more than necessary, it is possible to prevent the occurrence of entrainment.
[0021]
【The invention's effect】
As described above, in the bent hardware device of the present invention, the collar covers a part of the second screw, is formed integrally with the undercut portion, and the end is raised in the space of the cylinder. It is located at a height where the molding material does not get caught. Therefore, the molding material does not vent up. In addition, since the flow velocity of the gas passing through the deaeration port is suppressed by increasing the opening area of the deaeration port, the occurrence of entrainment is also suppressed. Furthermore, since the inner surface of the surface in contact with the molding material is subjected to an inner surface treatment with good releasability of the molding material, the molding material is hardly burnt or deteriorated.
[Brief description of the drawings]
FIG. 1 is a schematic cross-sectional view of an embodiment of a vent hardware for an extruder according to the present invention.
FIG. 2 is a schematic sectional view of an example of a conventional vent hardware for an extruder.
FIG. 3 is a schematic cross-sectional view of another conventional vent hardware for an extruder.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Cylinder 1a Upper surface 1b Inner wall surface 2 First screw 3 Second screw 4, 5 Screw receiving hole 6 Deaeration port 7 Vent hardware 7a Upper surface 7b End surface 8 Undercut portion 8a End portion 9a End portion 10 Inner surface treatment 11 Extrusion Machine 12 Surface 13 Space

Claims (4)

スクリュの回転により成形材料を可塑化しつつ送り出す押出機の、前記スクリュを収納するシリンダの上部に取り付けられ、前記成形材料から発生した揮発分の脱気を行うための開口が形成された押出機用ベント金物装置において、
端部（８ａ）がシリンダ（１）の上面（１ａ）よりも下方に位置し、少なくとも第１のスクリュ（２）の一部を覆うアンダーカット部（８）と、
前記アンダーカット部（８）と一体的に形成され、前記端部（８ａ）側に向けて成形材料を移送するように回転する前記第１のスクリュ（２）と同方向に回転し、かつ、前記第１のスクリュ（２）に併設されている第２のスクリュ（３）の一部を覆い、端部（９ａ）がシリンダ（１）の上面（１ａ）よりも上方に位置するつば（９）とを有し、
前記第１のスクリュ（２）および前記第２のスクリュ（３）の上方に形成された空間（１３）と外部とを連通する脱気口（６）の開口面積が、成形材料から発生し、前記脱気口（６）を通過するガスの流速が所定の速度以下となる面積であることを特徴とする押出機用ベント金物装置。For an extruder that is attached to the upper part of a cylinder that houses the screw and that is formed with an opening for degassing volatiles generated from the molding material, of an extruder that plasticizes and sends out the molding material by rotating the screw. In the vent hardware,
An undercut portion (8) whose end (8a) is located below the upper surface (1a) of the cylinder (1) and covers at least a part of the first screw (2);
Rotating in the same direction as the first screw (2) formed integrally with the undercut portion (8) and rotating so as to transfer a molding material toward the end portion (8a); A flange (9) that covers a part of the second screw (3) attached to the first screw (2) and whose end (9a) is located higher than the upper surface (1a) of the cylinder (1). ) And
An opening area of a deaeration port (6) for communicating a space (13) formed above the first screw (2) and the second screw (3) with the outside is generated from a molding material, A vent fitting device for an extruder, characterized in that the flow rate of the gas passing through the deaeration port (6) is an area where the flow rate is equal to or lower than a predetermined speed. 少なくとも、前記アンダーカット部（８）の端部（８ａ）から前記つば（９）の端部（９ａ）との間を繋ぐ面（１２）と、ベント金物装置（７）の端面（７ｂ）とに、成形材料の剥離性が良好となる内面処理（１０）が施されている、請求項１に記載の押出機用ベント金物装置。At least a surface (12) connecting between an end (8a) of the undercut portion (8) and an end (9a) of the collar (9), and an end surface (7b) of a vent hardware device (7). The vent metal fitting device for an extruder according to claim 1, wherein an inner surface treatment (10) for improving the releasability of the molding material is performed on the inside. 内面処理（１０）が、セラミック、メッキ、テフロンのコーティング材の群より選ばれた１つのコーティング材によるものである、請求項２に記載の押出機用ベント金物装置。The vent fitting apparatus for an extruder according to claim 2, wherein the inner surface treatment (10) is performed by one coating material selected from the group consisting of ceramic, plating, and Teflon coating materials. スクリュの回転により成形材料を可塑化しつつ送り出す、請求項３に記載の押出機用ベント金物装置を前記スクリュを収納するシリンダの上部に取付可能な押出機であって、
前記空間（１３）に面する前記シリンダ（１）の内壁面（１ｂ）に、成形材料の剥離性が良好となる内面処理（１０）が施されていることを特徴とする押出機。An extruder, wherein the extruder vent metal fitting device according to claim 3, which is capable of being attached to an upper part of a cylinder storing the screw, wherein the molding material is sent out while plasticizing the molding material by rotation of the screw,
An extruder characterized in that an inner wall surface (1b) of the cylinder (1) facing the space (13) is subjected to an inner surface treatment (10) for improving the releasability of a molding material.
JP2002186429A 2002-06-26 2002-06-26 Vent hardware fitment for extruder, and extruder Pending JP2004025669A (en)

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009103714A3 (en) * 2008-02-19 2009-10-29 Basf Se Degassing extruder for extruding moulding compounds
WO2014129367A1 (en) 2013-02-21 2014-08-28 株式会社日本製鋼所 Vent assembly device for twin-screw extruder
CN109551740A (en) * 2018-12-03 2019-04-02 华南理工大学 A kind of exhaust metalwork
JP2021037689A (en) * 2019-09-03 2021-03-11 株式会社日本製鋼所 Twin-screw kneading extruder and vent adapter
CN115091722A (en) * 2022-06-17 2022-09-23 厦门法德尔智能机械有限公司 Exhaust device of screw extruder

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009103714A3 (en) * 2008-02-19 2009-10-29 Basf Se Degassing extruder for extruding moulding compounds
WO2014129367A1 (en) 2013-02-21 2014-08-28 株式会社日本製鋼所 Vent assembly device for twin-screw extruder
JP2014162013A (en) * 2013-02-21 2014-09-08 Japan Steel Works Ltd:The Vent hardware device for twin screw extruder
CN104995009A (en) * 2013-02-21 2015-10-21 株式会社日本制钢所 Vent assembly device for twin-screw extruder
EP2930004A4 (en) * 2013-02-21 2016-08-31 Japan Steel Works Ltd Vent assembly device for twin-screw extruder
CN104995009B (en) * 2013-02-21 2017-05-24 株式会社日本制钢所 Vent assembly device for twin-screw extruder
US9731448B2 (en) 2013-02-21 2017-08-15 The Japan Steel Works, Ltd. Vent assembly device for twin-screw extruder
CN109551740A (en) * 2018-12-03 2019-04-02 华南理工大学 A kind of exhaust metalwork
JP2021037689A (en) * 2019-09-03 2021-03-11 株式会社日本製鋼所 Twin-screw kneading extruder and vent adapter
JP7307635B2 (en) 2019-09-03 2023-07-12 株式会社日本製鋼所 Twin-screw kneading extruder and vent adapter
CN115091722A (en) * 2022-06-17 2022-09-23 厦门法德尔智能机械有限公司 Exhaust device of screw extruder
CN115091722B (en) * 2022-06-17 2024-02-02 厦门法德尔智能机械有限公司 Exhaust device of screw extruder

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