JP2015205402A - Twin screw extruder - Google Patents

Twin screw extruder Download PDF

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Publication number
JP2015205402A
JP2015205402A JP2014085366A JP2014085366A JP2015205402A JP 2015205402 A JP2015205402 A JP 2015205402A JP 2014085366 A JP2014085366 A JP 2014085366A JP 2014085366 A JP2014085366 A JP 2014085366A JP 2015205402 A JP2015205402 A JP 2015205402A
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Prior art keywords
discharge port
screw extruder
material discharge
twin
screen plate
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JP6312203B2 (en
Inventor
福田　裕之
Hiroyuki Fukuda
裕之 福田
繁人 歳内
Shigeto Saiuchi
繁人 歳内
紅露　明雄
Akio Koro
明雄 紅露
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Sumitomo Rubber Industries Ltd
Nihon Spindle Manufacturing Co Ltd
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Sumitomo Rubber Industries Ltd
Nihon Spindle Manufacturing Co Ltd
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    • 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
    • B29B7/58—Component parts, details or accessories; Auxiliary operations
    • B29B7/582—Component parts, details or accessories; Auxiliary operations for discharging, e.g. doors
    • 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
    • B29B7/484—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 with two shafts provided with screws, e.g. one screw being shorter than the other
    • 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
    • B29B7/30—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
    • B29B7/52—Mixing; Kneading continuous, with mechanical mixing or kneading devices with movable mixing or kneading devices with rollers or the like, e.g. calenders
    • 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

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)

Abstract

PROBLEM TO BE SOLVED: To provide a twin screw extruder configured to efficiently remove foreign matters contained in a material while utilizing advantages of the twin screw extruder with high productivity.SOLUTION: A screen plate 32 is disposed at a material discharge port 12a of a twin screw extruder so that the screen plate 32 is slidable along the material discharge port 12a by a slide mechanism 39. A mesh screen 34 is attachably and detachably attached to the screen plate 32. Cutting edges 37a and 37b to cut a material extruded from the material discharge port 12a, and a material discharge part 38 to discharge the material cut by the cutting edges 37a and 37b are disposed on the screen plate 32.

Description

本発明は、２軸押出機に関し、特に、天然ゴムや各種添加剤を配合した配合ゴム等の高粘度物質（以下、「材料」という。）中に混在する不純物や未分散物等の異物（以下、単に、「異物」という。）を除去することができるようにした２軸押出機に関するものである。   The present invention relates to a twin-screw extruder, and in particular, foreign matters such as impurities and undispersed matter mixed in high-viscosity substances (hereinafter referred to as “materials”) such as natural rubber and rubber blended with various additives. Hereinafter, the present invention simply relates to a twin-screw extruder that can remove foreign matter).

従来、材料に含まれる異物を除去するために、材料排出口にメッシュスクリーンを配設して押し出しを行うストレーニング工程を実施するために１軸押出機が使用されている。
ところで、この１軸押出機は、材料投入口の間口が小さく、また、噛み込み性が劣るため、事前に材料をリボン形状等に小さく予備成形する必要があり、また、材料排出口の面積が小さいため、組み合わせるストレーニング機構のメッシュスクリーンの面積も小さくなり、十分な処理量が得られず、生産性が低いという問題があった。 Conventionally, in order to remove foreign substances contained in a material, a single screw extruder has been used to perform a straining process in which a mesh screen is disposed at a material discharge port to perform extrusion.
By the way, this single-screw extruder has a small entrance for the material inlet and is inferior in biting property, so it is necessary to preform the material into a ribbon shape or the like in advance, and the area of the material outlet is small. Since it is small, the area of the mesh screen of the straining mechanism to be combined also becomes small, there is a problem that a sufficient throughput cannot be obtained and productivity is low.

一方、上記生産性が低いという問題に対処するものとして、材料投入口を形成したテーパ筒状のホッパ部と、該ホッパ部に続いて先端に材料排出口を形成したテーパ筒状の圧縮部とを備えたケーシング内に、テーパ状のスクリュー羽根を配設した２本のスクリュー軸を回転可能に設けた２軸押出機が汎用されている（例えば、特許文献１〜２参照。）が、この２軸押出機において、ストレーニング工程を実施できるようにしたものはなかった。   On the other hand, as a countermeasure to the problem of low productivity, a tapered cylindrical hopper portion having a material input port, and a tapered cylindrical compression portion having a material discharge port at the tip following the hopper portion, A two-screw extruder in which two screw shafts having tapered screw blades disposed therein are rotatably provided in a casing provided with (see, for example, Patent Documents 1 and 2). None of the twin screw extruders made it possible to perform the straining process.

特開平９−１６４５７８号公報JP-A-9-164578 特開２００６−３０５９７６号公報JP 2006-305976 A

本発明は、生産性が高い２軸押出機の利点を生かしながら、材料に含まれる異物を効率よく除去することができるようにした２軸押出機を提供することを目的とする。   An object of the present invention is to provide a twin-screw extruder capable of efficiently removing foreign matters contained in a material while taking advantage of a twin-screw extruder having high productivity.

上記目的を達成するため、本発明の２軸押出機は、材料投入口を形成したテーパ筒状のホッパ部と、該ホッパ部に続いて先端に材料排出口を形成したテーパ筒状の圧縮部とを備えたケーシング内に、テーパ状のスクリュー羽根を配設した２本のスクリュー軸を回転可能に設けた２軸押出機において、材料排出口に、スライド機構によって材料排出口に沿って摺動可能となるようにスクリーン板を配設し、該スクリーン板にメッシュスクリーンを着脱可能に取り付けるようにしたことを特徴とする。   In order to achieve the above object, a twin-screw extruder according to the present invention includes a tapered cylindrical hopper portion in which a material input port is formed, and a tapered cylindrical compression portion in which a material discharge port is formed at the tip following the hopper portion. In a twin-screw extruder in which two screw shafts with tapered screw blades are rotatably provided in a casing provided with slid along the material discharge port by a slide mechanism at the material discharge port It is characterized in that a screen plate is disposed so as to be possible, and a mesh screen is detachably attached to the screen plate.

この場合において、前記スクリーン板に、メッシュスクリーンの交換時に材料排出口から膨出してくる材料を切断する切断刃と、該切断刃によって切断された材料を排出する材料排出部を設けることができる。   In this case, the screen plate can be provided with a cutting blade for cutting the material bulging from the material discharge port when the mesh screen is replaced, and a material discharge portion for discharging the material cut by the cutting blade.

また、前記メッシュスクリーンを、ブレーカープレートを介してスクリーン板に取り付けるようにするとともに、該ブレーカープレートの材料排出口に面する側を、その中心部が材料排出口側が凸となる曲面に形成するようにすることができる。   In addition, the mesh screen is attached to the screen plate via a breaker plate, and the side facing the material discharge port of the breaker plate is formed into a curved surface whose central portion is convex on the material discharge port side. Can be.

本発明の２軸押出機によれば、材料排出口に、スライド機構によって材料排出口に沿って摺動可能となるようにスクリーン板を配設し、該スクリーン板にメッシュスクリーンを着脱可能に取り付けるようにすることにより、メッシュスクリーンの交換作業を円滑にできることから、生産性が高い２軸押出機の利点を生かしながら、材料に含まれる異物を効率よく除去することができる。   According to the twin-screw extruder of the present invention, the screen plate is disposed at the material discharge port so as to be slidable along the material discharge port by the slide mechanism, and the mesh screen is detachably attached to the screen plate. By doing so, since the mesh screen can be exchanged smoothly, the foreign matters contained in the material can be efficiently removed while taking advantage of the high productivity twin screw extruder.

また、前記スクリーン板に、メッシュスクリーンの交換時に材料排出口から膨出してくる材料を切断する切断刃と、該切断刃によって切断された材料を排出する材料排出部を設けることにより、スクリーン板に取り付けたメッシュスクリーンを材料排出口側に移動させる際に、材料排出口から材料自体が有する弾性により膨出してきた材料がメッシュスクリーンに強く擦るように接触することによってメッシュスクリーンが損傷したり、位置ずれを起こすことを未然に防止することができる。   Further, the screen plate is provided with a cutting blade for cutting the material bulging from the material discharge port when the mesh screen is replaced, and a material discharge portion for discharging the material cut by the cutting blade. When moving the installed mesh screen to the material discharge port side, the mesh screen may be damaged or contacted by the material bulging due to the elasticity of the material itself from the material discharge port so as to rub against the mesh screen. It is possible to prevent the deviation from occurring.

また、前記メッシュスクリーンを、ブレーカープレートを介してスクリーン板に取り付けるようにするとともに、該ブレーカープレートの材料排出口に面する側を、その中心部が材料排出口側が凸となる曲面に形成するようにすることにより、ストレーニングを行うことによってメッシュスクリーンの外周部に材料の層が形成されるため、スクリーン板に取り付けたメッシュスクリーンを材料排出口から移動させる際に、メッシュスクリーンが損傷したり、位置ずれを起こすことを防止することができる。   In addition, the mesh screen is attached to the screen plate via a breaker plate, and the side facing the material discharge port of the breaker plate is formed into a curved surface whose central portion is convex on the material discharge port side. By forming a layer of material on the outer periphery of the mesh screen by performing the training, the mesh screen is damaged when moving the mesh screen attached to the screen plate from the material discharge port, It is possible to prevent misalignment.

本発明の２軸押出機の一実施例を示し、（ａ）は全体図、（ｂ）はホッパ部の平面図である。One Example of the twin-screw extruder of this invention is shown, (a) is a general view, (b) is a top view of a hopper part. 同２軸押出機のストレーニング機構（ストレーニング位置）を示し、（ａ）は平面断面図、（ｂ）は材料の流れ方向上流側（ホッパ部側）から見た正面図である。The straining mechanism (straining position) of the twin-screw extruder is shown, (a) is a plan sectional view, and (b) is a front view as viewed from the upstream side (hopper side) in the material flow direction. 同２軸押出機のストレーニング機構（移動中の位置）を示し、（ａ）は平面断面図、（ｂ）は材料の流れ方向上流側（ホッパ部側）から見た正面図である。The straining mechanism (position during movement) of the twin-screw extruder is shown, (a) is a plan sectional view, and (b) is a front view as seen from the upstream side (hopper part side) in the material flow direction. 本発明の２軸押出機のストレーニング機構（ストレーニング位置）の第１変形実施例を示し、（ａ）は平面断面図、（ｂ）は材料の流れ方向上流側（ホッパ部側）から見た正面図である。The 1st modified example of the straining mechanism (straining position) of the twin-screw extruder of this invention is shown, (a) is a plane sectional view, (b) is a material flow direction upstream side (hopper part side). FIG. 本発明の２軸押出機のストレーニング機構（ストレーニング位置）の第２変形実施例を示し、（ａ）は平面断面図、（ｂ）は材料の流れ方向上流側（ホッパ部側）から見た正面図である。The 2nd modified example of the straining mechanism (straining position) of the twin-screw extruder of the present invention is shown, (a) is a plan sectional view, and (b) is viewed from the upstream side in the material flow direction (hopper side). FIG.

以下、本発明の２軸押出機の実施の形態を、図面に基づいて説明する。   Hereinafter, embodiments of the twin-screw extruder of the present invention will be described with reference to the drawings.

図１〜図３に、本発明の２軸押出機の一実施例を示す。
この２軸押出機は、フィーダ部として、従来の２軸テーパ押出機と同様、材料投入口１１ａを形成したテーパ筒状のホッパ部１１と、このホッパ部１１に続いて先端に材料排出口１２ａを形成したテーパ筒状の圧縮部１２とを備えたケーシング１内に、テーパ状のスクリュー羽根２１を配設した２本のスクリュー軸２を回転可能に設けるようにしている。
そして、この２軸押出機は、フィーダ部の材料の流れ方向下流側に、ストレーニング機構３を、その下流側に、２軸ロール４を、それぞれ配置することにより、材料のストレーニング及びシート状成形を連続して行うことができるようにしている。 1 to 3 show an embodiment of the twin screw extruder of the present invention.
In this biaxial extruder, as a conventional biaxial taper extruder, a tapered cylindrical hopper portion 11 having a material inlet 11a and a material discharge port 12a at the tip following the hopper portion 11 are provided as a feeder portion. The two screw shafts 2 provided with the tapered screw blades 21 are rotatably provided in the casing 1 having the tapered cylindrical compression portion 12 having the above-described shape.
And this biaxial extruder arrange | positions the straining mechanism 3 in the downstream of the flow direction of the material of a feeder part, and arrange | positions the biaxial roll 4 in the downstream, respectively. Molding can be performed continuously.

この場合において、ストレーニング機構３は、ケーシング１の材料排出口１２ａに接続される材料流路３１ａ、３１ｂを形成したブロック状の本体部３１と、シリンダからなるスライド機構３９によって材料排出口１２ａに沿って摺動可能となるように配設した、より具体的には、材料排出口１２ａに接続される材料流路３１ａ、３１ｂを横断するように配設したスクリーン板３２と、スクリーン板３２の２箇所に形成した円形の窓部３２ａ、３２ｂに装着されるブレーカープレート３３と、このブレーカープレート３３の材料の流れ方向上流側（フィーダ部側）に着脱可能に取り付けるようにしたメッシュスクリーン３４と、スクリーン板３２の２箇所に形成した円形の窓部３２ａ、３２ｂの間に設けた、メッシュスクリーン３４の交換時に材料排出口１２ａから膨出してくる材料を切断する切断刃３７ａ、３７ｂと、この切断刃３７ａ、３７ｂによって切断された材料を排出する材料排出部３８とでその主要部を構成するようにしている。   In this case, the straining mechanism 3 is connected to the material discharge port 12a by a block-shaped main body 31 formed with material flow paths 31a and 31b connected to the material discharge port 12a of the casing 1 and a slide mechanism 39 including a cylinder. More specifically, the screen plate 32 disposed so as to be slidable along the material flow path 31a, 31b connected to the material discharge port 12a, and the screen plate 32 A breaker plate 33 attached to the circular windows 32a and 32b formed in two places, and a mesh screen 34 that is detachably attached to the upstream side (feeder side) in the material flow direction of the breaker plate 33; When replacing the mesh screen 34 provided between the circular windows 32a and 32b formed at two locations on the screen plate 32 The cutting blades 37a and 37b for cutting the material bulging from the material discharge port 12a and the material discharge portion 38 for discharging the material cut by the cutting blades 37a and 37b constitute the main part. .

このストレーニング機構３のブロック状の本体部３１のケーシング１の材料排出口１２ａに接続される材料流路３１ａ、３１ｂは、スクリーン板３２の窓部３２ａ、３２ｂとほぼ同形状の円形に形成するとともに、材料の流れ方向上流側となる材料流路３１ａの材料排出口１２ａ側が、材料流路３１ａと同形状になるように、漸次横に長い楕円形になるように形成するようにしている。   The material flow paths 31 a and 31 b connected to the material discharge port 12 a of the casing 1 of the block-shaped main body 31 of the straining mechanism 3 are formed in a circle having substantially the same shape as the windows 32 a and 32 b of the screen plate 32. At the same time, the material discharge port 12a side of the material flow path 31a on the upstream side in the material flow direction is formed so as to gradually become a long oval so as to have the same shape as the material flow path 31a.

また、本体部３１には、本体部３１と、本体部３１の材料流路３１ａ、３１ｂを横断するように配設したスクリーン板３２との隙間から材料が漏出しないようにするために、材料流路３１ａ、３１ｂの外周側にスクリーン板３２に摺接するようにシールリング３５を設けるようにしている。   In addition, in the main body 31, in order to prevent the material from leaking from the gap between the main body 31 and the screen plate 32 disposed so as to cross the material flow paths 31 a and 31 b of the main body 31, A seal ring 35 is provided on the outer peripheral side of the paths 31a and 31b so as to be in sliding contact with the screen plate 32.

ブレーカープレート３３及びメッシュスクリーン３４は、材料の性状、除去対象の異物に応じたものを用いることができるが、本実施例においては、ブレーカープレート３３には、多数の円形の透孔を形成し、ブレーカープレート３３のケーシング１の材料排出口１２ａに面する側（材料流路３１ａに面する側）を、その中心部が材料排出口１２ａ側に凸となる突出した曲面に形成し、ブレーカープレート３３の材料流路３１ｂに面する側を、平坦面に形成するようにしたものを用いるようにしている。
これにより、ストレーニングを行うことによってメッシュスクリーン３４の外周部に材料の層が形成されるため、交換のためにスクリーン板３２に取り付けたメッシュスクリーン３４をスクリーン板３２を摺動させることによって材料排出口１２ａから移動させる際に、メッシュスクリーン３４が損傷したり、位置ずれを起こすことを防止することができる。
また、ブレーカープレート３３を上記形状にすることにより、圧力が及びにくいブレーカープレート３３の外周部の厚みを薄くすることができ、当該箇所の材料の通過抵抗を低減させ、処理量を確保することができるようにしている。
なお、ブレーカープレート３３は、ブレーカープレート３３の材料流路３１ｂに面する側を平坦面に形成することに代えて、その中心部が材料排出口１２ａ側に凸となる窪んだ曲面形状に形成することもでき、これにより、ブレーカープレート３３の全体の厚みを薄くすることができ、ブレーカープレート３３の全体に亘って材料の通過抵抗を低減させ、処理量を確保することができるようにすることもできる。 As the breaker plate 33 and the mesh screen 34, those according to the properties of the material and the foreign matter to be removed can be used. In the present embodiment, the breaker plate 33 is formed with a number of circular through holes, The side of the breaker plate 33 facing the material discharge port 12a (the side facing the material flow path 31a) of the casing 1 is formed as a protruding curved surface whose central portion is convex toward the material discharge port 12a. The side facing the material flow path 31b is formed as a flat surface.
As a result, a layer of material is formed on the outer peripheral portion of the mesh screen 34 by performing the straining. Therefore, the mesh screen 34 attached to the screen plate 32 for replacement is slid on the screen plate 32 to discharge the material. When moving from the outlet 12a, the mesh screen 34 can be prevented from being damaged or displaced.
In addition, by making the breaker plate 33 in the above-described shape, the thickness of the outer peripheral portion of the breaker plate 33 that is difficult to apply pressure can be reduced, and the passage resistance of the material in the relevant portion can be reduced, and the processing amount can be secured. I can do it.
Note that the breaker plate 33 is formed in a concave curved surface with a central portion projecting toward the material discharge port 12a instead of forming a flat surface on the side facing the material flow path 31b of the breaker plate 33. Accordingly, it is possible to reduce the overall thickness of the breaker plate 33, to reduce the passage resistance of the material over the entire breaker plate 33, and to secure a processing amount. it can.

ブレーカープレート３３及びメッシュスクリーン３４は、スクリーン板３２の窓部３２ａ、３２ｂに嵌め込むようにして装着されるが、必要に応じて、押さえリング、ねじ等からなる固定部材３６によってスクリーン板３２に固定することもできる。   The breaker plate 33 and the mesh screen 34 are mounted so as to be fitted into the window portions 32a and 32b of the screen plate 32. If necessary, the breaker plate 33 and the mesh screen 34 are fixed to the screen plate 32 by a fixing member 36 including a pressing ring and a screw. You can also.

また、スクリーン板３２の２箇所に形成した円形の窓部３２ａ、３２ｂの間に設けた、材料排出口１２ａから膨出してくる材料を切断する切断刃３７ａ、３７ｂと、この切断刃３７ａ、３７ｂによって切断された材料を排出する材料排出部３８とによって、新たにスクリーン板３２に取り付けたメッシュスクリーン３４を材料排出口１２ａ側に移動させる際に、材料排出口１２ａ側から材料自体が有する弾性により膨出してきた材料を、切断刃３７ａ、３７ｂ（スクリーン板３２の移動方向が、図３に示す方向の場合は、主として、切断刃３７ａ）によって切断し、材料排出部３８に排出、除去することができ、当該材料がメッシュスクリーン３４に強く擦るように接触（圧接）することによってメッシュスクリーン３４が損傷したり、位置ずれを起こすことを未然に防止することができる。   Further, cutting blades 37a and 37b provided between the circular windows 32a and 32b formed at two locations on the screen plate 32 for cutting the material bulging from the material discharge port 12a, and the cutting blades 37a and 37b. When the mesh screen 34 newly attached to the screen plate 32 is moved to the material discharge port 12a side by the material discharge unit 38 for discharging the material cut by the above, the elasticity of the material itself from the material discharge port 12a side The bulging material is cut by the cutting blades 37a and 37b (mainly the cutting blade 37a when the moving direction of the screen plate 32 is the direction shown in FIG. 3), and discharged to the material discharge portion 38 and removed. The mesh screen 34 may be damaged by the contact (pressure contact) so that the material strongly rubs against the mesh screen 34, That cause a record can be prevented in advance.

ここで、本実施例においては、切断刃３７ａ、３７ｂを片山形の２つの部材で構成し、この切断刃３７ａ、３７ｂの間に溝状の材料排出部３８を形成するようにしたが、図４に示す第１変形実施例のように、切断刃３７を両山形の１つの部材で構成し、この切断刃３７の両側に溝状の材料排出部３８ａ、３８ｂを形成するようにすることができる。
また、材料排出部３８、３８ａ、３８ｂを、スクリーン板３２の表面を窪ませて形成した溝状のものに代えて、図５に示す第２変形実施例のように、スクリーン板３２を貫通したスリット状のものとしたり、さらに、下方を開放することにより、材料が自然に排出される形状のものとすることができる。
また、切断刃３７ａ、３７ｂは、スクリーン板３２と面一に設けるようにすることが好ましく、これにより、本体部３１にスクリーン板３２に摺接するように設けたシールリング３５が切断刃３７ａ、３７ｂによって損傷することを防止することができる。 Here, in the present embodiment, the cutting blades 37a and 37b are constituted by two single-sided members, and the groove-shaped material discharge portion 38 is formed between the cutting blades 37a and 37b. As in the first modified example shown in FIG. 4, the cutting blade 37 is constituted by a single member having both mountain shapes, and groove-shaped material discharge portions 38a and 38b are formed on both sides of the cutting blade 37. it can.
Further, the material discharge portions 38, 38a and 38b are penetrated through the screen plate 32 as in the second modified embodiment shown in FIG. 5 instead of the groove-shaped one formed by recessing the surface of the screen plate 32. It can be made into a slit shape or a shape in which the material is naturally discharged by opening the lower part.
The cutting blades 37a and 37b are preferably provided flush with the screen plate 32, so that the seal ring 35 provided so as to be in sliding contact with the screen plate 32 on the main body 31 is provided with the cutting blades 37a and 37b. Can prevent damage.

スライド機構３９は、本実施例においては、シリンダから構成するようにしているが、モータ等の任意の駆動機構を用いることができ、また、スライド機構３９によるスクリーン板３２の摺動方向を、本実施例の水平方向に代えて、鉛直方向にすることもできる。   In this embodiment, the slide mechanism 39 is composed of a cylinder. However, an arbitrary drive mechanism such as a motor can be used, and the sliding direction of the screen plate 32 by the slide mechanism 39 is set in the present direction. Instead of the horizontal direction of the embodiment, a vertical direction can be used.

このストレーニング機構３は、スライド機構３９によりスクリーン板３２を摺動させることによって、スクリーン板３２の２箇所に形成した円形の窓部３２ａ、３２ｂに取り付けたメッシュスクリーン３４の使用と交換を交互に行うことができるようにしている。
これにより、メッシュスクリーン３４の交換作業を円滑にできることから、生産性が高い２軸押出機の利点を生かしながら、一連の工程で材料に含まれる異物を効率よく除去することができ、材料の品質の向上と工程の短縮化を図ることができる。
また、ブレーカープレート３３及びメッシュスクリーン３４に代えて、スペーサリング（図示省略）を配設することにより、材料が当該部分をそのまま通過するようにして、通常の２軸押出機として使用できるようにすることができる。 The straining mechanism 3 alternately uses and replaces the mesh screen 34 attached to the circular windows 32 a and 32 b formed at two locations on the screen plate 32 by sliding the screen plate 32 with the slide mechanism 39. To be able to do.
As a result, the mesh screen 34 can be exchanged smoothly, so that the foreign matter contained in the material can be efficiently removed in a series of processes while taking advantage of the highly productive twin-screw extruder. Can be improved and the process can be shortened.
In addition, by providing a spacer ring (not shown) instead of the breaker plate 33 and the mesh screen 34, the material passes through the portion as it is so that it can be used as a normal twin-screw extruder. be able to.

以上、本発明の２軸押出機について、その実施例に基づいて説明したが、本発明は上記実施例に記載した構成に限定されるものではなく、その趣旨を逸脱しない範囲において適宜その構成を変更することができるものである。   As described above, the twin-screw extruder of the present invention has been described based on the embodiments thereof, but the present invention is not limited to the configurations described in the above-described embodiments, and the configurations thereof are appropriately set within the scope not departing from the gist thereof. It can be changed.

本発明の２軸押出機は、生産性が高い２軸押出機の利点を生かしながら、材料に含まれる異物を効率よく除去することができることから、材料に含まれる異物を除去するために用いられる２軸押出機の用途に好適に用いることができる。   The twin-screw extruder of the present invention can be used to remove foreign substances contained in the material because the foreign substances contained in the material can be efficiently removed while taking advantage of the high-productivity twin-screw extruder. It can use suitably for the use of a twin screw extruder.

１ ケーシング
１１ ホッパ部
１１ａ 材料投入口
１２ 圧縮部
１２ａ 材料排出口
２ スクリュー軸
２１ スクリュー羽根
３ ストレーニング機構
３１ 本体部
３１ａ、３１ｂ 材料流路
３２ スクリーン板
３２ａ 窓部
３２ｂ 窓部
３３ ブレーカープレート
３４ メッシュスクリーン
３５ シールリング
３６ 固定部材
３７、３７ａ、３７ｂ 切断刃
３８、３８ａ、３８ｂ 材料排出部
３９ スライド機構
４ ２軸ロール DESCRIPTION OF SYMBOLS 1 Casing 11 Hopper part 11a Material input port 12 Compression part 12a Material discharge port 2 Screw shaft 21 Screw blade 3 Straining mechanism 31 Main body part 31a, 31b Material flow path 32 Screen board 32a Window part 32b Window part 33 Breaker plate 34 Mesh screen 35 Seal ring 36 Fixing member 37, 37a, 37b Cutting blade 38, 38a, 38b Material discharge part 39 Slide mechanism 4 Biaxial roll

Claims (3)

材料投入口を形成したテーパ筒状のホッパ部と、該ホッパ部に続いて先端に材料排出口を形成したテーパ筒状の圧縮部とを備えたケーシング内に、テーパ状のスクリュー羽根を配設した２本のスクリュー軸を回転可能に設けた２軸押出機において、材料排出口に、スライド機構によって材料排出口に沿って摺動可能となるようにスクリーン板を配設し、該スクリーン板にメッシュスクリーンを着脱可能に取り付けるようにしたことを特徴とする２軸押出機。   Tapered screw blades are placed in a casing that has a tapered cylindrical hopper with a material inlet and a tapered cylindrical compression with a material outlet at the tip following the hopper. In the twin-screw extruder provided with the two screw shafts rotatably, a screen plate is disposed at the material discharge port so as to be slidable along the material discharge port by a slide mechanism. A twin-screw extruder, wherein a mesh screen is detachably attached. 前記スクリーン板に、メッシュスクリーンの交換時に材料排出口から膨出してくる材料を切断する切断刃と、該切断刃によって切断された材料を排出する材料排出部を設けたことを特徴とする請求項１記載の２軸押出機。   The screen plate is provided with a cutting blade for cutting the material bulging from the material discharge port when the mesh screen is replaced, and a material discharge portion for discharging the material cut by the cutting blade. 2. A twin-screw extruder according to item 1. 前記メッシュスクリーンを、ブレーカープレートを介してスクリーン板に取り付けるようにするとともに、該ブレーカープレートの材料排出口に面する側を、その中心部が材料排出口側が凸となる曲面に形成してなることを特徴とする請求項１又は２記載の２軸押出機。   The mesh screen is attached to the screen plate via a breaker plate, and the side facing the material discharge port of the breaker plate is formed into a curved surface whose center is convex on the material discharge port side. The twin-screw extruder according to claim 1 or 2.
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