JP3771910B2 - Screw for twin-screw kneading extruder - Google Patents

Screw for twin-screw kneading extruder Download PDF

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Publication number
JP3771910B2
JP3771910B2 JP2003057044A JP2003057044A JP3771910B2 JP 3771910 B2 JP3771910 B2 JP 3771910B2 JP 2003057044 A JP2003057044 A JP 2003057044A JP 2003057044 A JP2003057044 A JP 2003057044A JP 3771910 B2 JP3771910 B2 JP 3771910B2
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Prior art keywords
screw
tip
direction side
cross
rotation direction
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JP2004262177A (en
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哲也 小岩
茂樹 井上
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
    • B29C48/65—Screws with two or more threads neighbouring threads or channels having different configurations, e.g. one thread being lower than its neighbouring thread
    • 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
    • B29C48/251—Design of extruder parts, e.g. by modelling based on mathematical theories or experiments
    • B29C48/2517—Design of extruder parts, e.g. by modelling based on mathematical theories or experiments of intermeshing 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
    • B29C48/395—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
    • B29C48/402—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 the screws having intermeshing 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
    • B29C48/405—Intermeshing co-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
    • B29C48/395—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

Description

【０００１】
【発明の属する技術分野】
本発明は、樹脂などの固体材料を可塑化混練して押し出す２軸混練押出機に用いられるスクリュに関するものである。
【０００２】
【従来の技術】
２軸混練押出機は、シリンダ内に並列して設けられた２本のスクリュにより、固体材料を移送し、溶融・混練するようにしたものである。通常、そのスクリュには、主としてフルフライトスクリュからなる送り部と、ロータスクリュやニーディングディスクスクリュなどからなる混練部とが設けられる。
【０００３】
従来のそのような２軸混練押出機のスクリュは、その回転軸線に直交する垂直面に沿って切断した横断面図で見ると、図１に示されているように、隣接するスクリュ溝底部に対応する２点ｃ，ｄを結ぶ線分ｃｄの中点Ｍと、スクリュ先端の二つの角部ｅ，ｆを結ぶ線分ｅｆの中点Ｎとを通る直線Ｌに関して左右対称の形状を有するものとされていた。
本明細書では、そのような横断面形状を有するスクリュを「一般形状のスクリュ」と呼ぶこととする。
なお、図１に示されているようなスクリュにおいて、一般に、スクリュ先端の二つの角部ｅ，ｆを結ぶ線分ｅｆの長さは「チップ幅」と呼ばれ、線分ｃｄの中点Ｍと線分ｅｆの中点Ｎとの間の長さは「チップ高さ」と呼ばれている。
【０００４】
【発明が解決しようとする課題】
ところで、２軸混練押出機においては、材料は、主として混練部において、スクリュとスクリュとの間、あるいはスクリュとシリンダとの間に挟まれて、回転するスクリュにより剪断応力が加えられることによって溶融・混練されるのであるが、そのとき同時に圧縮もされるので、材料には高い圧力が発生する。特に、スクリュの噛み合い部においては、左右のスクリュの先端が接近する際に、瞬間的に材料が高圧縮されるので、材料圧力が非常に高くなることがある。その材料圧力の反力は、スクリュの回転軸線に直交する方向の力としてスクリュに加えられる。そのために、スクリュがシリンダの内壁に接触して、スクリュ及びシリンダが摩耗する、という問題がある。
前述したような従来の一般形状のスクリュでは、このような問題は避けられないこととなっていた。
【０００５】
本発明は、このような実情に鑑みてなされたものであって、その目的は、２軸混練押出機において、スクリュとシリンダとの摩耗の原因となる過大な材料圧力の発生が軽減されるようにすることである。
【０００６】
【課題を解決するための手段】
この目的を達成するために、本発明では、スクリュの回転方向側の先端角部近辺を削り、スクリュの横断面形状が、隣接するスクリュ溝底部に対応する２点を結ぶ線分の中点と、スクリュ先端の二つの角部を結ぶ線分の中点とを通る直線に関して左右非対称となるようにしている。その切削は、一般形状のスクリュの横断面図における回転方向側の先端角部から反回転方向側の先端角部に向かってチップ幅の２０〜９０％の長さの箇所に位置する第１切削点と、回転方向側の先端角部からスクリュ溝底部に対応する点に向かってチップ高さの２０〜１００％の長さの箇所に位置する第２切削点とを滑らかにつなぐ曲線に沿って行う。
【０００７】
このように構成することにより、例えばスクリュの噛み合い部において左右のスクリュの先端が接近するときにも、その間には隙間が形成されるので、材料が圧縮されることによって発生する圧力はその隙間から逃げることになる。その結果、材料に剪断応力を加える際に発生する材料圧力が低下して、スクリュに加わる反力が低減される。
第１切削点の位置を、回転方向側の先端角部から反回転方向側の先端角部に向かってチップ幅の２０％以下の箇所とすると、左右のスクリュの先端が接近するときにその間に形成される隙間の幅が十分な大きさとはならないので、効果が得られない。一方、その位置をチップ幅の９０％以上の箇所とすると、スクリュの先端部が尖りすぎとなってしまうので、適当でない。また、第２切削点の位置を、回転方向側の先端角部からスクリュ溝底部に対応する点に向かってチップ高さの２０％以下の箇所とすると、左右のスクリュの先端が接近するときに第２切削点の近傍において材料が挟み付けられることになるので、十分な効果は得られない。そこで、それらの切削点の位置は上述の範囲とされる。
【０００８】
【発明の実施の形態】
以下、図面を用いて本発明の実施の形態を説明する。
図中、図２は本発明による２軸混練押出機のスクリュの一例を示す平面図であり、図３はそのスクリュの横断面図である。
【０００９】
図２から明らかなように、このスクリュ１，１は、主として混練部に用いられる２条のロータスクリュである。そのスクリュ１の回転軸線Ｏ−Ｏに直交する垂直面に沿って切断した横断面は、図３に示されているように、左右非対称な形状とされている。すなわち、仮想線で示されている一般形状のスクリュの横断面図において、その回転方向側の先端角部ｅと反回転方向側の先端角部ｆとの間の１点を第１切削点Ａ、回転方向側の先端角部ｅと同側のスクリュ溝底部に対応する点ｃとの間の１点を第２切削点Ｂとするとき、それらの切削点Ａ，Ｂを滑らかにつなぐ曲線に沿って切削して、その回転方向側の先端角部ｅ近辺を除去した横断面形状である。
第１切削点Ａの位置は、一般形状のスクリュの横断面図における回転方向側の先端角部ｅから反回転方向側の先端角部ｆに向かってチップ幅の２０〜９０％の長さの箇所とされ、第２切削点Ｂの位置は、同じく一般形状のスクリュの横断面図における回転方向側の先端角部ｅからスクリュ溝底部に対応する点ｃに向かってチップ高さの２０〜１００％の長さの箇所とされる。
【００１０】
このような横断面形状のスクリュ１，１を用いた２軸混練押出機においては、図４に示されているように、シリンダ２内のスクリュ噛み合い部３において左右のスクリュ１，１の先端が接近するときにも、その間には十分な大きさの隙間４が形成されることになる。したがって、スクリュ１，１の先端間に材料が挟まれて圧縮されることにより発生する圧力は、その隙間４から逃げる。その結果、発生する材料圧力が低下して、スクリュ１，１に加わる反力が低減され、スクリュ１とシリンダ２との接触による摩耗が防止される。
しかも、材料は、回転するスクリュ１，１によって攪拌され、剪断応力を受けるので、その混練は十分に行われる。
【００１１】
【実施例】
実際に上述のような左右非対称形状のスクリュを製作し、それを用いて固体樹脂材料であるポリプロピレン（ＰＰ）の混練を行った。製作上の都合から、そのスクリュはニーディングディスクスクリュとした。そのスクリュの第１切削点Ａの位置は、一般形状のスクリュの横断面図における回転方向側の先端角部ｅから反回転方向側の先端角部に向かってチップ幅の７０％の長さの箇所とし、第２切削点Ｂの位置は、一般形状のスクリュの横断面図における回転方向側の先端角部ｅからスクリュ溝底部に対応する点ｃに向かってチップ高さの６０％の長さの箇所とした。使用した混練押出機は、株式会社日本製鋼所製の２軸混練押出機「ＴＥＸ６５αII」である。
比較のために、従来の一般形状のスクリュ（ニーディングディスクスクリュ）を用いて同じ条件で同じ材料の混練を行った。
そして、図４に符号５で示されている位置に圧力センサを取り付け、それぞれの場合におけるスクリュ噛み合い部３での最大樹脂圧力を測定した。
【００１２】
表１は、その混練条件と測定結果とを示すものである。
【表１】

Figure 0003771910
この測定結果から、本発明によるスクリュを用いると、従来の一般形状のスクリュを用いた場合よりも、スクリュ噛み合い部での最大圧力が３５％程度低下することがわかる。したがって、スクリュに加わる反力が低減され、スクリュとシリンダとの摩耗が大幅に抑制されると予測される。
【００１３】
なお、以上の説明では、スクリュとしては２条のものを例に挙げて説明したが、本発明は、それに限られることなく、１条のスクリュにも、また、３条以上のスクリュにも適用することができるものである。また、図４には、スクリュ１，１が同方向に回転するものとして示されているが、本発明は、異方向に回転する２軸混練押出機のスクリュに適用することもでき、その場合にも、同様の効果を得ることができる。
更に、本発明は、上述のような混練部に用いられるロータスクリュやニーディングディスクスクリュのほか、主として送り部に用いられるフルフライトスクリュにも適用することができる。そのようにフルフライトスクリュに適用すれば、送り部における不要な混練を低減させる、という効果をも期待することができる。
【００１４】
【発明の効果】
以上の説明から明らかなように、本発明によれば、２軸混練押出機用のスクリュを、その回転方向側の先端角部近辺を除去した形状とするようにしているので、スクリュの回転に伴って発生する材料圧力を低減させることができる。したがって、スクリュに加わる材料圧力の反力が低下し、過大な反力によりスクリュがシリンダ内壁に接触してそれらが摩耗する、ということが防止される。
【図面の簡単な説明】
【図１】従来の一般形状のスクリュの横断面形状を説明するための説明図である。
【図２】本発明による２軸混練押出機用スクリュの一例を示す平面図である。
【図３】図２のスクリュの横断面図である。
【図４】本発明によるスクリュを用いた２軸混練押出機の作用を説明するための説明図である。
【符号の説明】
１ スクリュ
２ シリンダ
３ スクリュ噛み合い部
４ 隙間
Ａ 第１切削点
Ｂ 第２切削点
ｃ，ｄ 一般形状のスクリュの横断面図におけるスクリュ溝底部に対応する点
ｅ 一般形状のスクリュの回転方向側の先端角部
ｆ スクリュの反回転方向側の先端角部
Ｌ 線分ｃｄの中点と線分ｅｆの中点とを通る直線
Ｍ 線分ｃｄの中点
Ｎ 線分ｅｆの中点
Ｏ−Ｏ スクリュの回転軸線[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a screw used in a twin-screw kneading extruder that plasticizes and extrudes a solid material such as a resin.
[0002]
[Prior art]
The biaxial kneader-extruder is one in which a solid material is transferred, melted and kneaded by two screws provided in parallel in a cylinder. Usually, the screw is provided with a feeding portion mainly composed of a full flight screw and a kneading portion composed of a low task screw or a kneading disk screw.
[0003]
A conventional screw of such a twin-screw kneading extruder has a cross-sectional view cut along a vertical plane perpendicular to the rotational axis thereof, as shown in FIG. Having a symmetrical shape with respect to a straight line L passing through the midpoint M of the line segment cd connecting the two corresponding points c and d and the midpoint N of the line segment ef connecting the two corners e and f of the screw tip It was said.
In the present specification, a screw having such a cross-sectional shape is referred to as a “general shape screw”.
In the screw as shown in FIG. 1, generally, the length of the line segment ef connecting the two corners e and f at the tip of the screw is called “chip width”, and the midpoint M of the line segment cd. And the midpoint N of the line segment ef is called “chip height”.
[0004]
[Problems to be solved by the invention]
By the way, in the twin-screw kneading extruder, the material is melted by applying a shearing stress by a rotating screw sandwiched between a screw and a screw or between a screw and a cylinder mainly in a kneading part. Although they are kneaded, they are also compressed at the same time, so that a high pressure is generated in the material. In particular, at the meshing portion of the screw, when the tip of the left and right screws approaches, the material is instantaneously highly compressed, so the material pressure may become very high. The reaction force of the material pressure is applied to the screw as a force in a direction perpendicular to the rotational axis of the screw. Therefore, there exists a problem that a screw contacts with the inner wall of a cylinder and a screw and a cylinder wear.
Such a problem has been unavoidable in the conventional general-purpose screw as described above.
[0005]
The present invention has been made in view of such circumstances, and its purpose is to reduce the generation of excessive material pressure that causes wear between the screw and the cylinder in a twin-screw kneading extruder. Is to do.
[0006]
[Means for Solving the Problems]
In order to achieve this object, in the present invention, the vicinity of the corner of the tip on the rotation direction side of the screw is shaved, and the cross-sectional shape of the screw is the midpoint of the line segment connecting two points corresponding to the adjacent screw groove bottoms , A straight line passing through the midpoint of the line segment connecting the two corners of the screw tip is asymmetrical. The cutting is a first cutting located at a position having a length of 20 to 90% of the chip width from the tip corner on the rotation direction side to the tip corner on the counter-rotation direction side in the cross-sectional view of the screw having a general shape. Along the curve that smoothly connects the point and the second cutting point located at a position 20 to 100% of the tip height from the corner on the rotation direction side toward the point corresponding to the bottom of the screw groove Do.
[0007]
With this configuration, for example, even when the left and right screw tips approach each other at the meshing portion of the screw, a gap is formed between them, so that the pressure generated by compressing the material is from the gap. I will run away. As a result, the material pressure generated when a shear stress is applied to the material is reduced, and the reaction force applied to the screw is reduced.
Assuming that the position of the first cutting point is 20% or less of the tip width from the tip corner on the rotation direction side to the tip corner on the counter-rotation direction side, when the tips of the left and right screws approach, Since the width of the gap formed is not sufficiently large, no effect can be obtained. On the other hand, if the position is 90% or more of the chip width, the tip of the screw is too sharp, which is not appropriate. Further, when the position of the second cutting point is set to a location that is 20% or less of the tip height from the corner on the rotation direction side toward the point corresponding to the bottom of the screw groove, the tip of the left and right screws approaches. Since the material is sandwiched in the vicinity of the second cutting point, a sufficient effect cannot be obtained. Therefore, the positions of those cutting points are in the above-described range.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
2 is a plan view showing an example of a screw of the twin-screw kneading extruder according to the present invention, and FIG. 3 is a cross-sectional view of the screw.
[0009]
As is apparent from FIG. 2, the screws 1 and 1 are two low task screws mainly used in the kneading section. A cross section cut along a vertical plane perpendicular to the rotation axis OO of the screw 1 has an asymmetrical shape as shown in FIG. That is, in the cross-sectional view of the screw having the general shape shown by the phantom line, one point between the tip corner e on the rotation direction side and the tip corner f on the counter-rotation direction side is the first cutting point A. When a point between the tip corner e on the rotation direction side and the point c corresponding to the screw groove bottom on the same side is the second cutting point B, a curve that smoothly connects the cutting points A and B is obtained. The cross-sectional shape is obtained by cutting along the rotation direction and removing the vicinity of the tip corner e on the rotation direction side.
The position of the first cutting point A is 20 to 90% of the tip width from the tip corner e on the rotation direction side to the tip corner f on the counter-rotation direction side in the cross-sectional view of the screw having a general shape. The position of the second cutting point B is 20 to 100 of the chip height from the tip end corner e on the rotation direction side to the point c corresponding to the screw groove bottom in the cross-sectional view of the screw having the same general shape. % Of the length.
[0010]
In the biaxial kneading and extruding machine using the screws 1 and 1 having such a cross-sectional shape, the ends of the left and right screws 1 and 1 at the screw meshing portion 3 in the cylinder 2 are shown in FIG. Even when approaching, a sufficiently large gap 4 is formed between them. Therefore, the pressure generated when the material is sandwiched and compressed between the tips of the screws 1 and 1 escapes from the gap 4. As a result, the generated material pressure decreases, the reaction force applied to the screws 1 and 1 is reduced, and wear due to contact between the screw 1 and the cylinder 2 is prevented.
Moreover, since the material is stirred by the rotating screws 1 and 1 and subjected to shear stress, the kneading is sufficiently performed.
[0011]
【Example】
Actually, a screw having an asymmetric shape as described above was produced, and polypropylene (PP), which is a solid resin material, was used for kneading. For the convenience of production, the screw was a kneading disk screw. The position of the first cutting point A of the screw is 70% of the tip width from the tip corner e on the rotation direction side to the tip corner on the counter-rotation direction side in the cross-sectional view of the screw having a general shape. The position of the second cutting point B is 60% of the tip height from the tip corner e on the rotation direction side to the point c corresponding to the bottom of the screw groove in the cross-sectional view of the general-shaped screw. It was taken as the part of. The kneading extruder used was a twin screw kneading extruder “TEX65αII” manufactured by Nippon Steel Works.
For comparison, the same material was kneaded under the same conditions using a conventional general shape screw (kneading disk screw).
And the pressure sensor was attached to the position shown with the code | symbol 5 in FIG. 4, and the maximum resin pressure in the screw meshing part 3 in each case was measured.
[0012]
Table 1 shows the kneading conditions and measurement results.
[Table 1]
Figure 0003771910
From this measurement result, it can be seen that when the screw according to the present invention is used, the maximum pressure at the screw meshing portion is reduced by about 35% as compared with the case of using the conventional general shape screw. Therefore, it is predicted that the reaction force applied to the screw is reduced, and wear between the screw and the cylinder is greatly suppressed.
[0013]
In the above description, two screws are used as an example in the above description, but the present invention is not limited to this and is applicable to one screw or three or more screws. Is something that can be done. 4 shows that the screws 1 and 1 rotate in the same direction, the present invention can also be applied to a screw of a twin-screw kneading extruder that rotates in different directions. In addition, a similar effect can be obtained.
Further, the present invention can be applied to a full flight screw mainly used for a feeding unit in addition to the low task screw and kneading disk screw used for the kneading unit as described above. If applied to such a full flight screw, the effect of reducing unnecessary kneading in the feeding section can be expected.
[0014]
【The invention's effect】
As is apparent from the above description, according to the present invention, the screw for the twin-screw kneading extruder is shaped so that the vicinity of the tip corner on the rotational direction side is removed. The accompanying material pressure can be reduced. Therefore, the reaction force of the material pressure applied to the screw is reduced, and the excessive reaction force prevents the screw from coming into contact with the inner wall of the cylinder and wearing them.
[Brief description of the drawings]
FIG. 1 is an explanatory diagram for explaining a cross-sectional shape of a conventional screw having a general shape.
FIG. 2 is a plan view showing an example of a screw for a twin-screw kneading extruder according to the present invention.
FIG. 3 is a cross-sectional view of the screw of FIG.
FIG. 4 is an explanatory diagram for explaining the operation of a twin-screw kneading extruder using a screw according to the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Screw 2 Cylinder 3 Screw meshing part 4 Clearance A 1st cutting point B 2nd cutting points c and d The point e corresponding to the screw groove bottom part in the cross-sectional view of a general shape screw The tip of the rotation direction side of a general shape screw Corner f The tip corner L on the counter-rotating direction side of the screw M The straight line M passing through the midpoint of the line segment cd and the midpoint of the line segment ef The midpoint N of the line segment cd The midpoint OO of the line segment ef Axis of rotation

Claims (1)

回転軸線に直交する垂直面に沿って切断したスクリュの横断面図で見て、隣接するスクリュ溝底部に対応する２点を結ぶ線分の中点と、スクリュ先端の二つの角部を結ぶ線分の中点とを通る直線に関して左右対称の横断面形状を有するスクリュを一般形状のスクリュとするとき、
その一般形状のスクリュを、その横断面図における回転方向側の先端角部から反回転方向側の先端角部に向かってチップ幅の２０〜９０％の長さの箇所に位置する第１切削点と、回転方向側の先端角部から同側のスクリュ溝底部に対応する点に向かってチップ高さの２０〜１００％の長さの箇所に位置する第２切削点とを滑らかにつなぐ曲線に沿って切削して、前記一般形状のスクリュから回転方向側の先端角部近辺を除去した横断面形状を有することを特徴とする、
２軸混練押出機用スクリュ。A line connecting the midpoint of the line connecting two points corresponding to the bottom of the adjacent screw groove and the two corners of the screw tip, as seen in a cross-sectional view of the screw cut along a vertical plane perpendicular to the rotation axis When a screw having a transverse cross-sectional shape symmetrical with respect to a straight line passing through the midpoint of the minute is a screw having a general shape,
A first cutting point where the screw having the general shape is located at a position 20 to 90% of the tip width from the tip corner on the rotation direction side to the tip corner on the counter-rotation direction side in the cross-sectional view. And a curve that smoothly connects the second cutting point located at a length of 20 to 100% of the tip height from the tip corner on the rotational direction side to the point corresponding to the screw groove bottom on the same side It is characterized by having a cross-sectional shape by cutting along and removing the vicinity of the tip corner on the rotation direction side from the screw of the general shape,
Screw for twin screw extruder.
JP2003057044A 2003-03-04 2003-03-04 Screw for twin-screw kneading extruder Expired - Fee Related JP3771910B2 (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102123845A (en) * 2008-06-20 2011-07-13 拜尔技术服务有限责任公司 Screw elements for extruding plastic materials, use of said screw elements, and extrusion method

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009096004A (en) 2007-10-15 2009-05-07 Kobe Steel Ltd Kneading device
DE102008029305A1 (en) * 2008-06-20 2009-12-24 Bayer Technology Services Gmbh Screw elements with reduced crest angle

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102123845A (en) * 2008-06-20 2011-07-13 拜尔技术服务有限责任公司 Screw elements for extruding plastic materials, use of said screw elements, and extrusion method
CN102123845B (en) * 2008-06-20 2014-05-14 拜耳知识产权有限责任公司 Screw elements for extruding plastic materials, use of said screw elements, and extrusion method

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