JP3254354B2 - Twin screw extruder - Google Patents

Twin screw extruder

Info

Publication number
JP3254354B2
JP3254354B2 JP23182095A JP23182095A JP3254354B2 JP 3254354 B2 JP3254354 B2 JP 3254354B2 JP 23182095 A JP23182095 A JP 23182095A JP 23182095 A JP23182095 A JP 23182095A JP 3254354 B2 JP3254354 B2 JP 3254354B2
Authority
JP
Japan
Prior art keywords
screw
head
twin
blade
resin
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
JP23182095A
Other languages
Japanese (ja)
Other versions
JPH0976326A (en
Inventor
達哉 上村
信之 山際
公雄 井上
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Kobe Steel Ltd
Original Assignee
Kobe Steel Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Kobe Steel Ltd filed Critical Kobe Steel Ltd
Priority to JP23182095A priority Critical patent/JP3254354B2/en
Publication of JPH0976326A publication Critical patent/JPH0976326A/en
Application granted granted Critical
Publication of JP3254354B2 publication Critical patent/JP3254354B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • 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
    • B29C48/565—Screws having projections other than the thread, e.g. pins
    • 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
    • B29C48/405—Intermeshing co-rotating screws

Landscapes

  • 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)

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【０００１】[0001]

【発明の属する技術分野】本発明は、プラスチック等の
高分子樹脂材料を押出成形するための二軸押出機に関す
る。The present invention relates to a twin-screw extruder for extruding a polymer resin material such as plastic.

【０００２】[0002]

【従来の技術】この種の二軸押出機では、被押出材を軸
心方向一側に搬送する一対のスクリューがチャンバー内
に回転自在でかつ互いに平行に挿通されており、この各
スクリューの先端部には、チャンバーの出口部において
押出時に溶融樹脂等の被押出材が滞留するのを防止すべ
く、それぞれスクリューヘッドが設けられている。2. Description of the Related Art In a twin-screw extruder of this type, a pair of screws which convey a material to be extruded to one side in an axial direction are rotatably inserted into a chamber in parallel with each other. Each section is provided with a screw head in order to prevent a material to be extruded such as a molten resin from staying at the outlet of the chamber during extrusion.

【０００３】図８及び図９は、かかるスクリューヘッド
を備えた二軸押出機の従来例を示している。このうち、
図８に示す二軸押出機では、チャンバー１５内に挿通さ
れた左右一対のスクリュー１６の先端部に、外周面が円
柱状とされたスクリューヘッド１７がねじ込みによって
着脱自在に設けられており、このスクリューヘッド１７
の先端部は先細り円錐状に形成されている。FIG. 8 and FIG. 9 show a conventional example of a twin-screw extruder provided with such a screw head. this house,
In the twin-screw extruder shown in FIG. 8, a screw head 17 having a cylindrical outer peripheral surface is detachably provided at a tip end of a pair of left and right screws 16 inserted into the chamber 15 by screwing. Screw head 17
Is formed in a tapered conical shape.

【０００４】一方、上記の円柱ないし円錐状のスクリュ
ーヘッド１７では、同ヘッド１７間での噛合部分がない
ので溶融樹脂が滞留しすぎて押出性能が阻害されるた
め、図９に示す二軸押出機では、スクリューヘッド１７
の外周面にスクリュー１６の螺旋翼１８と連続した螺旋
翼１９を形成しており、スクリューヘッド１７の先端部
は平坦面２０とされている（実公平１−１６５９２号公
報参照）。On the other hand, in the cylindrical or conical screw head 17 described above, since there is no meshing portion between the heads 17, the molten resin excessively stays and the extrusion performance is hindered. In the machine, screw head 17
A spiral blade 19 is formed on the outer peripheral surface of the screw head 17 and is continuous with the spiral blade 18 of the screw 16, and the tip of the screw head 17 is a flat surface 20 (see Japanese Utility Model Publication No. 1-15922).

【０００５】[0005]

【発明が解決しようとする課題】しかしながら、上記従
来の二軸押出機では、スクリュー１６によって溶融樹脂
が先端部（出口側）へ押し出されるときに、流れる樹脂
がスクリューヘッド１７と接する箇所において、高速で
回転する当該ヘッド１７（通常５００〜６００ｒｐｍ）
によって摩擦熱が生じ、局所的な発熱による樹脂の劣化
が発生することがある。However, in the above-described conventional twin-screw extruder, when the molten resin is extruded to the tip end (outlet side) by the screw 16, the high-speed extruder is positioned at a position where the flowing resin contacts the screw head 17. The head 17 that rotates with (usually 500 to 600 rpm)
As a result, frictional heat is generated, and deterioration of the resin due to local heat generation may occur.

【０００６】すなわち、図８に示すスクリューヘッド１
７では、高速回転する同ヘッド１７の外周面２１及び先
端面２２の双方が溶融樹脂に対して面接触して摩擦する
ので、この摩擦によって溶融樹脂が局所的に発熱する場
合がある。他方、図９に示すスクリューヘッド１７で
は、外周面に螺旋翼１９が形成されているので外周面で
は摩擦熱の問題は生じにくいが、先端の平坦面２０は依
然として溶融樹脂に対して面接触していて摩擦するの
で、この摩擦によって溶融樹脂が局所的に発熱しうる。That is, the screw head 1 shown in FIG.
In No. 7, since both the outer peripheral surface 21 and the front end surface 22 of the head 17 rotating at high speed are in surface contact with the molten resin and rub, the molten resin may locally generate heat due to this friction. On the other hand, in the screw head 17 shown in FIG. 9, since the spiral blade 19 is formed on the outer peripheral surface, the problem of frictional heat hardly occurs on the outer peripheral surface, but the flat surface 20 at the tip is still in surface contact with the molten resin. As a result, the molten resin may locally generate heat due to the friction.

【０００７】特に、多量の無機質フィラーが充填されて
いるコンパウンド樹脂の場合、粘度が非常に高いため、
高速回転するスクリューヘッド１７の周りや先端におい
て摩擦熱が生じやすく、また、発砲剤や架橋剤などを含
んだコンパウンド樹脂では、スクリューヘッド１７の周
りや先端において局所的な発熱による発砲ないし架橋反
応が生じる恐れがある。Particularly, in the case of a compound resin filled with a large amount of an inorganic filler, the viscosity is extremely high.
Friction heat is likely to be generated around and at the tip of the screw head 17 that rotates at high speed, and in a compound resin containing a foaming agent or a crosslinking agent, the firing or crosslinking reaction due to local heat generation around or at the tip of the screw head 17 may occur. May occur.

【０００８】本発明は、このような実情に鑑み、スクリ
ューヘッドが被押出材に対して摩擦するのを可及的に抑
えることにより、局所的な摩擦熱に伴う被押出材の劣化
を防止すること目的とする。In view of such circumstances, the present invention suppresses friction of the screw head against the material to be extruded as much as possible, thereby preventing deterioration of the material to be extruded due to local frictional heat. That is the purpose.

【０００９】[0009]

【課題を解決するための手段】上記目的を達成するため
に、本発明は、次の技術的手段を講じた。すなわち、本
発明は、被押出材を軸心方向一側に搬送する一対のスク
リューがチャンバー内に回転自在に挿通され、この各ス
クリューの先端部にそれぞれスクリューヘッドが設けら
れている二軸押出機において、前記スクリューヘッドの
外周面に、同ヘッドの基部から先端に至るまで軸心方向
に延びて形成された複数の羽根が周方向に間隔をおいて
突設され、この各羽根の外周縁部が前記チャンバーにお
ける前記スクリューの軸心方向と平行に延びた内面に近
接されていることを特徴とする（請求項１）。Means for Solving the Problems In order to achieve the above object, the present invention takes the following technical means. That is, the present invention provides a twin-screw extruder in which a pair of screws for conveying a material to be extruded to one side in the axial direction are rotatably inserted into a chamber, and a screw head is provided at a tip end of each screw. In the outer peripheral surface of the screw head, a plurality of blades formed extending in the axial direction from the base to the tip of the head are provided at intervals in the circumferential direction, and the outer peripheral edge of each blade is formed. you but to the chamber
Wherein the inner surface extends in parallel with the axial direction of the screw .

【００１０】上記の本発明では、スクリューヘッドの各
羽根は同ヘッドの基部からその先端まで軸心方向に沿っ
て延びており、しかも、この羽根の外周縁部がチャンバ
ーにおける前記スクリューの軸心方向と平行に延びた内
面に近接しているので、スクリューヘッドに至った被押
出材はその羽根に連れ回りされながら出口へ押し出され
ることになり、このため、被押出材はスクリューヘッド
の外周面や先端面との接触による摩擦を殆ど受けない。In the present invention, each blade of the screw head extends in the axial direction from the base of the head to the tip thereof, and the outer peripheral edge of the blade extends in the axial direction of the screw in the chamber . since close to the inner <br/> surface extending parallel with, the extruded material reaches the screw head will be pushed out to the outlet while being rotates to follow the blade and thus, the extruded material is screw Almost no friction due to contact with the outer peripheral surface or the tip surface of the head.

【００１１】また、羽根の外周縁部がチャンバー内面に
近接していてその隙間を流れる樹脂が極めて少ないの
で、その隙間を流れる樹脂によって摩擦熱が発生するこ
とは殆どない。この場合、羽根の外周縁部とチャンバー
内面との隙間を通過する樹脂の摩擦をより少なくするに
は、各羽根の外周縁部をシャープエッジに形成しておけ
ばよい（請求項２）。Further, since the outer peripheral edge of the blade is close to the inner surface of the chamber and the amount of resin flowing through the gap is extremely small, frictional heat is hardly generated by the resin flowing through the gap. In this case, in order to further reduce the friction of the resin passing through the gap between the outer peripheral edge of the blade and the inner surface of the chamber, the outer peripheral edge of each blade may be formed with a sharp edge.

【００１２】一方、本発明において、スクリューヘッド
の各羽根間における外周形状を同ヘッドの先端側に向か
って漸次縮径する形状とした場合（請求項３）、羽根間
で構成される空間部に入り込んだ樹脂が軸心方向へ排出
されやすくなる。また、一方のスクリューヘッドに設け
られている各羽根が他方のスクリューヘッドの羽根に対
する回転方向の位相が互いにずれるように配置した場合
（請求項４）、押出室の中央部で左右のスクリューヘッ
ドの羽根同士が近接しなくなって、同中央部における樹
脂の剪断発熱を防止できる。On the other hand, in the present invention, when the outer peripheral shape between the blades of the screw head is gradually reduced in diameter toward the tip end side of the head (claim 3), the space formed between the blades is The entered resin is easily discharged in the axial direction. Further, when the blades provided on one screw head are arranged so that the phases of the other screw heads in the rotation direction with respect to the blades are shifted from each other (claim 4), the left and right screw heads are located at the center of the extrusion chamber. Since the blades do not come close to each other, it is possible to prevent shear heat generation of the resin in the central portion.

【００１３】更に、スクリューヘッドに設けられている
各羽根を、同ヘッドの先端側に向かってスクリュー回転
方向と反対の方向へ漸次変位するように捩じる形状とす
れば（請求項５）、スクリューヘッドの回転力が羽根間
に詰まっている樹脂を押し出す方向へ作用するので、樹
脂の押出が促進される。Furthermore, if each blade provided on the screw head is twisted so as to be gradually displaced toward the tip end side of the screw head in the direction opposite to the screw rotation direction (claim 5), Since the rotational force of the screw head acts in the direction of pushing out the resin clogged between the blades, the extrusion of the resin is promoted.

【００１４】[0014]

【発明の実施の形態】以下、本発明の実施の形態を図面
に基づいて説明する。図１において、本発明に係る二軸
押出機は、楕円筒状のバレル１の先端にダイホルダ２を
着脱自在に連結してなるチャンバー３を備え、このチャ
ンバー３内に断面ほぼ８の字状の押出室４が形成されて
いる。Embodiments of the present invention will be described below with reference to the drawings. In FIG. 1, the twin-screw extruder according to the present invention includes a chamber 3 in which a die holder 2 is detachably connected to the tip of an elliptical cylindrical barrel 1. An extrusion chamber 4 is formed.

【００１５】チャンバー３の押出室４には、溶融樹脂等
の被押出材を軸心方向一側（図１（ａ）の左側）に搬送
する左右一対のスクリュー５が回転自在でかつ互いに平
行に挿通されていて、この各スクリュー５は、バレル１
の基端部に接続した軸受け手段によって回転自在に支持
され、図外の駆動モータ及び減速機を介して同方向に回
転駆動される。In the extrusion chamber 4 of the chamber 3, a pair of left and right screws 5 for conveying a material to be extruded such as a molten resin to one side in the axial direction (left side in FIG. 1A) are rotatable and parallel to each other. Each screw 5 is inserted into the barrel 1
Are rotatably supported by bearing means connected to the base end of the motor, and are rotationally driven in the same direction via a drive motor and a speed reducer (not shown).

【００１６】左右の各スクリュー５は、その外周面に一
定ピッチの螺旋翼６を備え、互いの螺旋翼６が噛合し合
うよう軸心方向に一ピッチずれた状態で押出室４内に配
置されている。各スクリュー５の先端部には、チャンバ
ー３の出口部（ダイホルダ２）において押し出される溶
融樹脂が滞留するのを防止すべく、それぞれスクリュー
ヘッド７が設けられている。Each of the left and right screws 5 is provided with spiral blades 6 having a constant pitch on the outer peripheral surface thereof, and is disposed in the extrusion chamber 4 in a state of being shifted by one pitch in the axial direction so that the spiral blades 6 mesh with each other. ing. Screw heads 7 are provided at the tips of the screws 5 in order to prevent the molten resin extruded at the outlet (die holder 2) of the chamber 3 from staying.

【００１７】このスクリューヘッド７は、スクリュー５
の先端に取り付けられる胴部８の基端面にねじ軸９を一
体に突設してなり、このねじ軸９をスクリュー５の先端
面にねじ込むことによって、同スクリュー５に対して着
脱自在に取り付けられる。図１（ａ）に示すように、本
実施の形態では、スクリューヘッド７の胴部８は先端側
（出口側）が細い円錐状に形成されており、この胴部８
の外周面に、胴部８とほぼ同じ軸心方向長さを有する直
角三角形状の羽根１０が、放射状に合計四枚突設されて
いる。The screw head 7 includes a screw 5
A screw shaft 9 is integrally protruded from a base end surface of a body portion 8 attached to a tip of the screw 5. The screw shaft 9 is screwed into a distal end surface of the screw 5 to be detachably attached to the screw 5. . As shown in FIG. 1A, in the present embodiment, the body 8 of the screw head 7 is formed in a thin conical shape on the tip side (outlet side).
A total of four right-angled triangular blades 10 having substantially the same length in the axial direction as the trunk portion 8 are radially protruded from the outer peripheral surface of the main body 8.

【００１８】しかして、各スクリューヘッド７の外周面
に、同ヘッド７の基部から先端に至るまで軸心方向（図
１（ａ）の左右方向）に延びて形成された複数の羽根１
０が周方向に間隔をおいて突設されている。また、スク
リューヘッド７の胴部８が円錐状であることから、同ヘ
ッド７の各羽根１０間の外周形状は先端側（図１（ａ）
の左側）に向かって漸次縮径する形状とされている。A plurality of blades 1 are formed on the outer peripheral surface of each screw head 7 so as to extend in the axial direction (from left to right in FIG. 1A) from the base to the tip of the head 7.
0 are protruded at intervals in the circumferential direction. Further, since the body 8 of the screw head 7 is conical, the outer peripheral shape between the blades 10 of the head 7 is on the tip side (FIG. 1A).
To the left).

【００１９】図１（ｂ）に示すように、この四枚の羽根
１０は周方向で９０度間隔おきに配置されており、各羽
根１０の外周縁部１０Ａは、その縁に至るほど先細り状
に面取り加工されたシャープエッジ１１に形成されてい
る。このシャープエッジ１１はダイホルダ２（チャンバ
ー３）におけるスクリュー５の軸心方向と平行に延びた
内面から僅かの隙間δを有するように同内面に対して近
接されている。As shown in FIG. 1B, the four blades 10 are arranged at intervals of 90 degrees in the circumferential direction, and the outer peripheral edge portion 10A of each blade 10 is tapered toward the edge. Is formed on the sharp edge 11 chamfered. The sharp edge 11 is close to the inner surface of the die holder 2 (chamber 3) so as to have a slight gap δ from the inner surface extending in parallel with the axial direction of the screw 5 in the die holder 2 (chamber 3).

【００２０】この外周縁部１０Ａのシャープエッジ１１
とダイホルダ２内面との間の隙間δは、スクリューヘッ
ド７の回転に伴ってこの隙間δを通過する羽根１０間の
樹脂量が同樹脂の押出方向への流量に比べて無視できる
ほど少なくなるように設定すればよく、本実施の形態で
はこの隙間δ＝約１ｍｍに設定してある。他方、各羽根
１０の先端縁部１０Ｂは、胴部８の軸心から半径方向に
沿って径外側へ放射状に延設され、外周縁部１０Ａと同
様なシャープエッジ１１に形成されている。The sharp edge 11 of the outer peripheral portion 10A
The gap δ between the resin and the inner surface of the die holder 2 is such that the amount of resin between the blades 10 passing through the gap δ with the rotation of the screw head 7 becomes negligibly small compared to the flow rate of the resin in the extrusion direction. In this embodiment, the gap δ is set to about 1 mm. On the other hand, the tip edge portion 10B of each blade 10 is radially extended radially outward from the axis of the body portion 8 along the radial direction, and has a sharp edge 11 similar to the outer peripheral edge portion 10A.

【００２１】上記構成に係る本発明の二軸押出機におい
て、スクリュー５の回転によって押出室４内を流れる溶
融樹脂は、スクリューヘッド７が内装されたダイホルダ
２の出口１２に至ったあと、この出口１２に装着される
図外のダイによって押出成形される。この場合、従前の
二軸押出機（図８や図９）では、スクリューヘッドに羽
根１０がなく同ヘッドが溶融樹脂と接触する部分が多い
ので、溶融樹脂が高速回転するスクリューヘッドとの接
触によって摩擦熱を生じる場合がある。In the twin-screw extruder according to the present invention having the above-described structure, the molten resin flowing in the extrusion chamber 4 by the rotation of the screw 5 reaches the outlet 12 of the die holder 2 in which the screw head 7 is installed. Extrusion molding is performed by a die (not shown) attached to the reference numeral 12. In this case, in the conventional twin-screw extruder (FIGS. 8 and 9), the screw head does not have the blade 10 and there are many portions where the head comes into contact with the molten resin. May generate frictional heat.

【００２２】これに対して、図１に示す本発明の二軸押
出機では、円錐状の胴部８から四枚の羽根１０が突設さ
れ、この羽根１０の外周縁部１０Ａがダイホルダ２の内
面に近接しているので、スクリューヘッド７まで至った
溶融樹脂は羽根１０と羽根１０との間に入り込み、羽根
１０に連れ回りされながらスクリュー５の押出作用によ
って出口１２へ流され、スクリューヘッド７との接触に
よる摩擦を殆ど受けることなく押し出されることにな
る。On the other hand, in the twin-screw extruder of the present invention shown in FIG. 1, four blades 10 protrude from the conical body 8, and the outer peripheral edge 10A of the blade 10 Since it is close to the inner surface, the molten resin that has reached the screw head 7 enters between the blades 10 and flows to the outlet 12 by the pushing action of the screw 5 while being rotated by the blade 10, and the screw head 7 It will be extruded with little friction due to contact.

【００２３】また、この場合、羽根１０の外周縁部１０
Ａがダイホルダ２の内面に１ｍｍ程度まで近接してい
て、羽根１０とダイホルダ２との隙間δが極めて小さい
ため、その間を流れる樹脂はごく少なく、かつ、その隙
間を流れる樹脂があったとしても外周縁部１０Ａがシャ
ープエッジ１１に形成されているので、その隙間δを流
れる樹脂が摩擦熱を発生させることは殆どない。In this case, the outer peripheral edge 10 of the blade 10
A is close to the inner surface of the die holder 2 to about 1 mm, and the gap δ between the blade 10 and the die holder 2 is extremely small, so that only a small amount of resin flows between them, and even if there is resin flowing through the gap, Since the peripheral portion 10A is formed at the sharp edge 11, the resin flowing through the gap δ hardly generates frictional heat.

【００２４】更に、胴部８が円錐状に形成されているの
で、羽根１０間で構成される空間部に入り込んだ樹脂が
軸心方向へ排出されやすくなっており、しかも、その樹
脂は胴部８に対して軸心方向へ滑るだけで、羽根１０の
連れ回り作用によって回転方向には滑らないので、摩擦
熱を生じることなく出口１２に向かって円滑に押し出さ
れることになる。Furthermore, since the body 8 is formed in a conical shape, the resin that has entered the space defined between the blades 10 can be easily discharged in the axial direction, and the resin is used in the body. Since the blade 8 only slides in the axial direction but does not slide in the rotational direction due to the co-rotating action of the blade 10, the blade 8 is smoothly pushed out toward the outlet 12 without generating frictional heat.

【００２５】一方、上記実施の形態では、図１（ｂ）に
示すように、各スクリューヘッド７の羽根１０の回転方
向の位相が左右で一致しているため、特に粘度の高い多
量の無機質フィラーが充填されているコンパウンド樹脂
の場合には、押出室４の中央部１３において樹脂が剪断
発熱するおそれがある。そこで、図２に示すように、一
方のスクリューヘッド７Ｌに設けられている各羽根１０
が他方のスクリューヘッド７Ｒの羽根に対する回転方向
の位相が互いにずれるよう、左右のスクリューヘッド７
Ｌ，７Ｒのスクリュー５に対する取付角度を設定するこ
とが好ましい。On the other hand, in the above embodiment, as shown in FIG. 1 (b), since the phases of the rotation directions of the blades 10 of the screw heads 7 are the same on the left and right, a large amount of the inorganic filler having a particularly high viscosity is used. In the case of a compound resin filled with, there is a possibility that the resin will generate heat by shearing in the central portion 13 of the extrusion chamber 4. Therefore, as shown in FIG. 2, each blade 10 provided on one screw head 7L
Of the left and right screw heads 7 so that the phases of the other screw heads 7R in the rotation direction with respect to the blades are shifted from each other.
It is preferable to set the mounting angles of the L and 7R with respect to the screw 5.

【００２６】このように左右のスクリューヘッド７Ｌ，
７Ｒのスクリュー５に対する取付角度をずらしておく
と、押出室４の中央部１３で左右のスクリューヘッド７
Ｌ，７Ｒの羽根１０同士が近接しなくなるので、当該中
央部１３における樹脂の剪断発熱を防止できる。また、
図１（ａ）では、スクリューヘッド７に設けられている
各羽根１０がスクリュー５の軸心方向と平行に延設され
ているが、図３に示すように、各羽根１０を、ヘッド７
の先端側に向かってスクリュー５回転方向と反対の方向
へ漸次変位するよう、軸心方向に対して若干捩じって形
成することにしてもよい。As described above, the left and right screw heads 7L,
If the mounting angle of the 7R to the screw 5 is shifted, the right and left screw heads 7 in the central portion 13 of the extrusion chamber 4 are shifted.
Since the blades 10 of L and 7R do not come close to each other, it is possible to prevent the heat generated by the shearing of the resin in the central portion 13. Also,
In FIG. 1A, each blade 10 provided on the screw head 7 extends in parallel with the axial direction of the screw 5, but as shown in FIG.
May be slightly twisted with respect to the axial direction so as to be gradually displaced in the direction opposite to the rotation direction of the screw 5 toward the tip end of the screw.

【００２７】羽根１０をこのように形成すれば、スクリ
ューヘッド７の回転力が羽根１０間に詰まっている樹脂
を回転させる方向だけでなく、同樹脂を軸心方向出側へ
押し出す方向へも作用することになるので、ダイホルダ
２内の樹脂の押出を促進することができる。更に、胴部
１０の形状は、図１（ａ）に示すような厳密な意味での
円錐状に限られず、図４の示すように、軸心方向中間部
が径内方向へやや凹んだ湾曲面とされた円錐状のもの
や、図５に示すように、軸心方向中間部が径外方向へや
や膨らんだ湾曲面とされた円錐状のものに形成すること
ができる。When the blades 10 are formed in this manner, the rotational force of the screw head 7 acts not only in the direction of rotating the resin clogged between the blades 10 but also in the direction of pushing the resin toward the axial direction. Therefore, the extrusion of the resin in the die holder 2 can be promoted. Further, the shape of the body 10 is not limited to a conical shape in a strict sense as shown in FIG. 1A, and as shown in FIG. It can be formed into a conical shape having a flat surface, or a conical shape having a curved surface whose intermediate portion in the axial direction slightly bulges outward in the radial direction as shown in FIG.

【００２８】また、粘度がさほど高くなくダイホルダ２
内での樹脂の押出が十分保証される場合には、例えば図
７に示すような円柱状に形成した胴部に各羽根１０を突
設させることにしてもよい。更に、図６の各図は、羽根
１０に形成すべき「シャープエッジ１１」の変形例を示
している。The viscosity of the die holder 2 is not so high.
When the resin extrusion within the inside is sufficiently ensured, each blade 10 may be protruded from, for example, a cylindrical body as shown in FIG. Further, each drawing of FIG. 6 shows a modification of the “sharp edge 11” to be formed on the blade 10.

【００２９】すなわち、図６（ａ）に示すように、羽根
１０のシャープエッジ１１は、スクリュー回転側にのみ
傾斜面１１Ａを形成することによって形成することもで
きる。また、図６（ｂ）に示すように、エッジ端に平面
部１１Ｂを形成したり、図６（ｃ）に示すような丸い面
１１Ｃによってシャープエッジ１１を構成することにし
てもよい。That is, as shown in FIG. 6A, the sharp edge 11 of the blade 10 can be formed by forming the inclined surface 11A only on the screw rotation side. Further, as shown in FIG. 6B, a plane portion 11B may be formed at the edge end, or the sharp edge 11 may be formed by a round surface 11C as shown in FIG. 6C.

【００３０】なお、上記した各実施の形態は例示的なも
のであって限定的なものではない。すなわち、本発明の
範囲は冒頭の特許請求の範囲によって示され、その請求
項の意味に入るすべての変形例は本発明に包含されるも
のである。例えば、本発明は、スクリュー５の中途部に
混練翼が形成されている二軸混練押出機にも採用でき、
食品素材を押出成形するための二軸押出機にも採用する
ことができる。The above embodiments are illustrative and not restrictive. That is, the scope of the present invention is defined by the appended claims, and all modifications that fall within the meaning of the claims are included in the present invention. For example, the present invention can be applied to a twin-screw kneading extruder in which a kneading blade is formed in the middle of the screw 5,
The present invention can also be applied to a twin-screw extruder for extruding food materials.

【００３１】また、羽根１０の厚さが十分小さくてシャ
ープエッジ１１を形成しなくてもよい場合には、その羽
根１０の外周縁部１０Ａをダイホルダ２の内面に近接さ
せておくだけで足りる。When the blade 10 has a sufficiently small thickness and does not need to form the sharp edge 11, it is sufficient that the outer peripheral edge 10 A of the blade 10 is brought close to the inner surface of the die holder 2.

【００３２】[0032]

【実施例】本発明の有効性を実証するために、試験用の
二軸押出機（ＫＴＸ−５９ 神戸製鋼）を用いて、以下
の諸元にて押出実験を行った。 樹脂流量 ２４０ ｋｇ／ｈ スクリュー回転数 ３６０ ｒｐｍ 押出室の内径 ４８ ｍｍ 間隙δの寸法 １ ｍｍ 樹脂の分解温度 ２００ °Ｃ そして、従来の羽根なしスクリューヘッド（図７）を有
するスクリューで押し出した場合と、本発明の羽根あり
スクリューヘッド（図１）を有するスクリューで押し出
した場合とについて、ダイホルダ２を通過する溶融樹脂
についてその幅方向５か所において樹脂温度を測定し
た。EXAMPLES In order to demonstrate the effectiveness of the present invention, an extrusion experiment was carried out using a test twin screw extruder (KTX-59 Kobe Steel) under the following specifications. Resin flow rate 240 kg / h Screw rotation speed 360 rpm Inner diameter of extrusion chamber 48 mm Dimension of gap δ 1 mm Decomposition temperature of resin 200 ° C And when extruded with a screw having a conventional bladeless screw head (FIG. 7) The resin temperature was measured at five points in the width direction of the molten resin passing through the die holder 2 when the resin was extruded with the screw having the bladed screw head (FIG. 1) of the present invention.

【００３３】その結果をまとめたものが図７である。こ
の図７から判るように、従来の羽根なしスクリューヘッ
ドの場合には、丁度そのヘッドが設けられている測点２
及び４において樹脂温度が２００°Ｃを超え、樹脂の分
解現象が見られた。このことから、羽根なしスクリュー
ヘッドでは同ヘッドと樹脂との接触摩擦によって局所的
な発熱が生じたものと解される。FIG. 7 summarizes the results. As can be seen from FIG. 7, in the case of the conventional bladeless screw head, the measuring point 2 at which the head is provided is used.
In Examples 4 and 4, the resin temperature exceeded 200 ° C., and a decomposition phenomenon of the resin was observed. From this, it can be understood that in the screw head without blades, local heat generation occurred due to contact friction between the head and the resin.

【００３４】これに対して、本発明の羽根ありスクリュ
ーヘッドでは、すべての測点１〜５において樹脂温度が
２００°Ｃを下回り、局所的な樹脂の分解現象は発生し
なかった。On the other hand, in the screw head with vanes of the present invention, the resin temperature was lower than 200 ° C. at all the measuring points 1 to 5, and no local decomposition phenomenon of the resin occurred.

【００３５】[0035]

【発明の効果】以上説明したように、本発明によれば、
スクリューヘッドが被押出材に対して摩擦するのが可及
的に抑えられるので、局所的な摩擦熱に伴う被押出材の
劣化を防止することができる（請求項１、２）。請求項
３記載の発明によれば、羽根間で構成される空間部に入
り込んだ樹脂が軸心方向へ排出されやすくなるので、羽
根を設けたことに伴う押出能力の低下を抑制できる。As described above, according to the present invention,
Since the friction of the screw head against the material to be extruded is suppressed as much as possible, deterioration of the material to be extruded due to local frictional heat can be prevented (claims 1 and 2). According to the third aspect of the present invention, the resin that has entered the space formed between the blades is easily discharged in the axial direction, so that a reduction in the extrusion ability due to the provision of the blades can be suppressed.

【００３６】また、請求項４記載の発明によれば、押出
室の中央部における樹脂の剪断発熱が抑制されるので、
局所的な発熱に伴う被押出材の劣化をより有効に防止で
きる。更に、請求項５記載の発明によれば、スクリュー
ヘッドの回転力が羽根間に詰まっている樹脂を押し出す
方向へも作用して、樹脂の押出が促進されるので、当該
羽根を設けたことに伴う押出能力の低下をより確実に防
止できる。According to the fourth aspect of the present invention, the heat generated by shearing of the resin in the central portion of the extrusion chamber is suppressed.
Deterioration of the material to be extruded due to local heat generation can be more effectively prevented. Furthermore, according to the invention as set forth in claim 5, since the rotational force of the screw head also acts in the direction in which the resin clogged between the blades is extruded, and the extrusion of the resin is promoted, the blades are provided. The accompanying reduction in extrusion ability can be more reliably prevented.

【図面の簡単な説明】[Brief description of the drawings]

【図１】（ａ）は本発明に係る二軸押出機の出口部の平
面断面図であり、（ｂ）はその横断面図である。FIG. 1A is a plan sectional view of an outlet portion of a twin-screw extruder according to the present invention, and FIG. 1B is a transverse sectional view thereof.

【図２】スクリューヘッドの配置の変形例を示す横断面
図である。FIG. 2 is a cross-sectional view showing a modification of the arrangement of the screw heads.

【図３】スクリューヘッドの羽根の変形例を示す斜視図
である。FIG. 3 is a perspective view showing a modified example of the blade of the screw head.

【図４】スクリューヘッドの胴部の変形例を示す側面図
である。FIG. 4 is a side view showing a modification of the body of the screw head.

【図５】スクリューヘッドの胴部の変形例を示す側面図
である。FIG. 5 is a side view showing a modification of the body of the screw head.

【図６】シャープエッジの変形例を示す断面図である。FIG. 6 is a cross-sectional view illustrating a modified example of a sharp edge.

【図７】実験結果の説明図である。FIG. 7 is an explanatory diagram of an experimental result.

【図８】従来の二軸押出機の出口部の平面断面図であ
る。FIG. 8 is a plan sectional view of an outlet of a conventional twin-screw extruder.

【図９】従来の二軸押出機の出口部の平面断面図であ
る。FIG. 9 is a plan sectional view of an outlet of a conventional twin-screw extruder.

【符号の説明】[Explanation of symbols]

３ チャンバー ４ 押出室 ５ スクリュー ７ スクリューヘッド ７Ｌ スクリューヘッド（左） ７Ｒ スクリューヘッド（右） ８ 胴部 １０ 羽根 １０Ａ 外周縁部 １０Ｂ 先端縁部 １１ シャープエッジ 3 Chamber 4 Extrusion Chamber 5 Screw 7 Screw Head 7L Screw Head (Left) 7R Screw Head (Right) 8 Body 10 Blade 10A Outer Edge 10B Tip Edge 11 Sharp Edge

───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特公 昭42−11506（ＪＰ，Ｂ１) (58)調査した分野(Int.Cl.7，ＤＢ名) B29C 47/00 - 47/96 B29B 7/00 - 7/94 ──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-B-42-11506 (JP, B1) (58) Fields investigated (Int. Cl. 7 , DB name) B29C 47/00-47/96 B29B 7 / 00-7/94

Claims (5)

(57)【特許請求の範囲】(57) [Claims] 【請求項１】 被押出材を軸心方向一側に搬送する一対
のスクリュー（５）がチャンバー（３）内に回転自在に
挿通され、この各スクリュー（５）の先端部にそれぞれ
スクリューヘッド（７）が設けられている二軸押出機に
おいて、 前記スクリューヘッド（７）の外周面に、同ヘッド
（７）の基部から先端に至るまで軸心方向に延びて形成
された複数の羽根（１０）が周方向に間隔をおいて突設
され、この各羽根（１０）の外周縁部（１０Ａ）が前記
チャンバー（３）における前記スクリュー（５）の軸心
方向と平行に延びた内面に近接されていることを特徴と
する二軸押出機。A pair of screws (5) for conveying a material to be extruded to one side in the axial direction are rotatably inserted into a chamber (3), and a screw head ( In the twin-screw extruder provided with 7), a plurality of blades (10) formed on the outer peripheral surface of the screw head (7) so as to extend in the axial direction from the base to the tip of the head (7). ) Are protruded at intervals in the circumferential direction, and the outer peripheral edge (10A) of each blade (10) is aligned with the axis of the screw (5) in the chamber (3) .
A twin-screw extruder characterized by being close to an inner surface extending parallel to the direction . 【請求項２】 各羽根（１０）の外周縁部（１０Ａ）が
シャープエッジ（１１）に形成されている請求項１記載
の二軸押出機。2. The twin-screw extruder according to claim 1, wherein the outer peripheral edge (10A) of each blade (10) is formed with a sharp edge (11). 【請求項３】 スクリューヘッド（７）の各羽根（１
０）間における外周形状が同ヘッド（７）の先端側に向
かって漸次縮径する形状とされている請求項１又は２記
載の二軸押出機。3. Each blade (1) of a screw head (7).
The twin-screw extruder according to claim 1 or 2, wherein the outer peripheral shape between the points (0) and (6) gradually decreases in diameter toward the tip end of the head (7). 【請求項４】 一方のスクリューヘッド（７Ｌ）に設け
られている各羽根（１０）が他方のスクリューヘッド
（７Ｒ）の羽根（１０）に対する回転方向の位相が互い
にずれるように配置されている請求項１〜３のいずれか
１つに記載の二軸押出機。4. The blades (10) provided on one screw head (7L) are arranged such that the phases of the other screw heads (7R) in the rotational direction with respect to the blades (10) are shifted from each other. Item 6. The twin-screw extruder according to any one of Items 1 to 3. 【請求項５】 スクリューヘッド（７）に設けられてい
る各羽根（１０）が同ヘッド（７）の先端側に向かって
スクリュー（５）回転方向と反対の方向へ漸次変位する
ように捩じられている請求項１〜４のいずれか１つに記
載の二軸押出機。5. The screw (10) provided on the screw head (7) is twisted so as to be gradually displaced in the direction opposite to the rotation direction of the screw (5) toward the tip side of the head (7). The twin-screw extruder according to any one of claims 1 to 4, wherein
JP23182095A 1995-09-08 1995-09-08 Twin screw extruder Expired - Fee Related JP3254354B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP23182095A JP3254354B2 (en) 1995-09-08 1995-09-08 Twin screw extruder

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP23182095A JP3254354B2 (en) 1995-09-08 1995-09-08 Twin screw extruder

Publications (2)

Publication Number Publication Date
JPH0976326A JPH0976326A (en) 1997-03-25
JP3254354B2 true JP3254354B2 (en) 2002-02-04

Family

ID=16929537

Family Applications (1)

Application Number Title Priority Date Filing Date
JP23182095A Expired - Fee Related JP3254354B2 (en) 1995-09-08 1995-09-08 Twin screw extruder

Country Status (1)

Country Link
JP (1) JP3254354B2 (en)

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US11426701B2 (en) * 2016-10-19 2022-08-30 Dietmar Gruber Mixing device in the screw antechamber of a twin-screw extruder

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Publication number Priority date Publication date Assignee Title
US6958128B2 (en) * 2003-11-21 2005-10-25 Certainteed Corporation Dynamic mixer screw tip
CN102490340B (en) * 2011-12-08 2014-07-23 浙江华业塑料机械有限公司 Conical twin-screw

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11426701B2 (en) * 2016-10-19 2022-08-30 Dietmar Gruber Mixing device in the screw antechamber of a twin-screw extruder

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