JPS60250931A - Screw extruder for super-high molecular polyethylene powder extrusion molding - Google Patents
Screw extruder for super-high molecular polyethylene powder extrusion moldingInfo
- Publication number
- JPS60250931A JPS60250931A JP59107511A JP10751184A JPS60250931A JP S60250931 A JPS60250931 A JP S60250931A JP 59107511 A JP59107511 A JP 59107511A JP 10751184 A JP10751184 A JP 10751184A JP S60250931 A JPS60250931 A JP S60250931A
- Authority
- JP
- Japan
- Prior art keywords
- screw
- high molecular
- barrel
- molecular weight
- ultra
- 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.)
- Granted
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
- B29C48/68—Barrels or cylinders
-
- 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
- B29C48/022—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the choice of material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2023/00—Use of polyalkenes or derivatives thereof as moulding material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2995/00—Properties of moulding materials, reinforcements, fillers, preformed parts or moulds
- B29K2995/0037—Other properties
- B29K2995/0088—Molecular weight
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は超高分子量ポリエチレン粉末の押出成形に好適
なスクリュー押出機に関する。DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a screw extruder suitable for extrusion molding of ultra-high molecular weight polyethylene powder.
超高分子量ポリエチレンは汎用のポリエチレンに比べ耐
衝撃性、耐摩耗性、耐薬品性、引張強度等に優れており
、エンジニアリングプラスチックとしてその用途が拡が
りつつある。しかしながら汎用のポリエチレンに比較し
て溶融粘度が極めて高く流動性が悪いため、押出成形や
射出成形によって成形することは非常に難しく、その殆
どは圧縮成形によって成形されており、一部ロツド等が
極〈低凍で即出跪影六わ７＋ハスのめ５預井てありさへ
一方、溶融樹脂の押出量増大を計る方法としてバレル内
周面の全長に亘っであるいは部分的に摩擦力増大部を設
定せしめたスクリュー押出機（特開昭４７−ｓ４４ｓｓ
号公報）、スクリューハウジング内部の実質的に全長に
亘って、または前記ハウジングの送り区域の下流のハウ
ジングの長さの主要部に亘って長手方向に溝装置が画成
されたスクリュー押出機（特開昭５０−１５９１５９号
公報）、第１の高粘性入口領域と第２の低粘性混合排出
領域とから構成された押出機の第１の領域にその内面に
沿って長手方向の溝が形成された押出機（特開昭５１−
９２８６８号公報）等、バレル内面に溝加工したスクリ
ュー押出機が種々提案されている。Ultra-high molecular weight polyethylene has superior impact resistance, abrasion resistance, chemical resistance, tensile strength, etc. compared to general-purpose polyethylene, and its use as an engineering plastic is expanding. However, compared to general-purpose polyethylene, the melt viscosity is extremely high and the fluidity is poor, so it is very difficult to mold by extrusion molding or injection molding.Most of the polyethylene is molded by compression molding, and some rods etc. On the other hand, as a way to increase the amount of extrusion of molten resin, it is possible to increase the frictional force over the entire length of the inner circumferential surface of the barrel or partially. Set screw extruder (JP-A-47-S44SS)
A screw extruder (particularly US Pat. 159159/1983), longitudinal grooves are formed along the inner surface of the first region of the extruder, which is composed of a first high-viscosity inlet region and a second low-viscosity mixing and discharge region. Extruder
Various screw extruders having grooves formed on the inner surface of the barrel have been proposed, such as Japanese Patent No. 92868).
これらバレルに溝加工したスクリュー押出機を超高分子
量ポリエチレンの押出成形に単に用いても、一般に超高
分子量ポリエチレンは粉末状であり、又スクリュー内で
の滞留時間が長くなると、一部ゲル化あるいは劣化した
りする虞れがあり、良好な押出成形物が得られない。例
えば特開昭４７−３４４５５号公報に具体的に開示され
た摩擦力増大部を少なくとも溶融押出区間全域に設けた
装置では、溶融した超高分子量ポリエチレンの一部が摩
擦力増大部に滞留してゲル化あるいは劣化して、超高分
子量ポリエチレンの優れた物性が失われる。Even if these screw extruders with grooved barrels are simply used to extrude ultra-high molecular weight polyethylene, the ultra-high molecular weight polyethylene is generally in the form of powder, and if the residence time in the screw is prolonged, some gelation or There is a risk of deterioration, and a good extruded product cannot be obtained. For example, in an apparatus specifically disclosed in JP-A No. 47-34455 in which a frictional force increasing section is provided at least throughout the entire melt extrusion section, a part of the molten ultra-high molecular weight polyethylene stays in the frictional force increasing section. The excellent physical properties of ultra-high molecular weight polyethylene are lost due to gelation or deterioration.
その現象は特開昭５０−１５９１５９号公報に具体的に
開示された装置も同様に発生する。又、特開昭５１−９
２８６８号公報に具体的に開示されたスクリューの如く
、圧縮比が２〜３．５の装置を用いると、溶融した超高
分子量ポリエチレンがスクリューと共廻りし易くなり、
安定した押出量が得られない等の欠点を有している。This phenomenon also occurs in the device specifically disclosed in Japanese Patent Application Laid-Open No. 50-159159. Also, JP-A-51-9
When using a device with a compression ratio of 2 to 3.5, such as the screw specifically disclosed in Publication No. 2868, the molten ultra-high molecular weight polyethylene tends to rotate together with the screw,
It has drawbacks such as not being able to obtain a stable extrusion rate.
かかる状況に鑑み、本発明者らは超高分子量ポリエチレ
ン粉末の押出成形方法を改良すべく種々検討した結果、
単にバレルに溝加工するだけでなく、溝加工の範囲を限
定し、しかも特定形状のスクリューとを組合せることに
より、均一で安定した押出量が得られることが分かり、
本発明に到達した。In view of this situation, the present inventors conducted various studies to improve the extrusion molding method for ultra-high molecular weight polyethylene powder, and as a result, found that
It was found that a uniform and stable extrusion amount could be obtained not only by simply grooving the barrel, but also by limiting the range of grooving and combining it with a screw of a specific shape.
We have arrived at the present invention.
すなわち本発明は、Ｌ／Ｄが２０ないし３６のフルフラ
イト型スクリュー押出機において、（Ｉ）バレル及び（
１）フルフライト型スクリューが下記要件（Ａ）〜（Ｅ
）を具備していることを特徴とする超高分子量ポリエチ
レン粉末押出成形用スクリュー押出機を提供するもので
ある。That is, the present invention provides a full-flight screw extruder with an L/D of 20 to 36, in which (I) a barrel and (
1) The full-flight screw meets the following requirements (A) to (E).
) A screw extruder for extrusion molding of ultra-high molecular weight polyethylene powder is provided.
（Ｉ）バレル
ＣＡ） ：樹脂供給部にホッパー下から下流方向にＩ、
／Ｄの１０ないし４０％の範囲の長さに溝が画成され、
且つ冷却機構を具備していること。(I) Barrel CA): I in the resin supply section from the bottom of the hopper in the downstream direction,
a groove is defined with a length ranging from 10 to 40% of /D;
In addition, it must be equipped with a cooling mechanism.
ＣＢ）：圧縮部及び計量部に加熱機構を具備しているこ
と。CB): The compression section and measuring section must be equipped with a heating mechanism.
（１）フルフライト型スクリュー
（Ｃ）：圧縮部の長さがＬ／Ｔｌの２５ないし８０％の
範囲であること。(1) Full-flight screw (C): The length of the compression part should be in the range of 25 to 80% of L/Tl.
■）：圧縮比が１．０ないし２．５の範囲であること。(2): Compression ratio should be in the range of 1.0 to 2.5.
（Ｅ）：フライトピッチが０．４Ｄないし１．Ｏｌｌの
範囲であること。(E): Flight pitch is 0.4D to 1. Must be within the range of Oll.
本発明に用いる超高分子量ポリエチレン粉末は、デカリ
ン溶媒中１３５°Ｃで測定した極限粘度〔η〕が５．５
ｄｌ／ｇ以上、好適には８ないし５０ｄ／／ｇで且つメ
ルトフローレー） （ＭＦＲ：ＡＳＴＭ Ｄ １２３８
゜Ｆ）が０．０１ ｇ／ １０ Ｔｎｉｎ以下のエチレ
ンの単独重合体モしくはエチレンと他のα−オレフィン
、例えばプロピレン、１−ブテン、１−ヘキセン、１−
オクテン、４−メチル−１−ペンテン等とのエチレンを
主成分とした共重合体で結晶性の粉末状樹脂である。The ultra-high molecular weight polyethylene powder used in the present invention has an intrinsic viscosity [η] of 5.5 as measured at 135°C in a decalin solvent.
dl/g or more, preferably 8 to 50 d/g and melt flow rate) (MFR: ASTM D 1238
Homopolymers of ethylene or ethylene and other α-olefins, such as propylene, 1-butene, 1-hexene, 1-
It is a crystalline powdery resin that is a copolymer mainly composed of ethylene with octene, 4-methyl-1-pentene, etc.
本発明の超高分子量ポリエチレン粉末押出成形用スクリ
ュー押出機は前記した如く、押出機のＬ／Ｄが２０ない
し３６、好ましくは２６ないし３０の範囲であり、樹脂
供給部から下流に流れ方向にＬ／Ｄの１０ないし４０％
、好ましくは２０ないし３０％の長さの溝が画成され、
且つ該溝加工部に冷却機構を具備し、圧縮部及び計量部
は加熱機構を具備したバレル、圧縮部の長さがＬ／Ｄの
２５ないし８０％、好ましくは４０ないし７０％、圧縮
比が１．０ないし２．５、好ましくは１．６ないし１．
８及びフライトピッチが０．４Ｄないし０．．８Ｄ、好
ましくは０．５Ｄないし０．７Ｄの範囲のフルフライト
型スクリューとを具備したスクリュー押出機である。As described above, in the screw extruder for extrusion molding of ultra-high molecular weight polyethylene powder of the present invention, the L/D of the extruder is in the range of 20 to 36, preferably 26 to 30. /10 to 40% of D
, preferably 20 to 30% of the length of the groove is defined;
The grooved part is equipped with a cooling mechanism, the compression part and the measuring part are barrels equipped with a heating mechanism, the length of the compression part is 25 to 80% of L/D, preferably 40 to 70%, and the compression ratio is 1.0 to 2.5, preferably 1.6 to 1.
8 and flight pitch between 0.4D and 0.8D. ．． A screw extruder equipped with a full-flight screw of 8D, preferably in the range of 0.5D to 0.7D.
押出機のＬ／Ｄが２０未満では高速回転での押出量が多
い場合、超高分子量ポリエチレンは溶融粘度が高く、フ
ライト間で混練作用を生じないため加熱設定温度に樹脂
温度が上らず、製品物性、外観を損うことがある。一方
３６を越えると、モーター負荷が過大になり必要以上に
電力を消費することになる。If the L/D of the extruder is less than 20 and the extrusion amount is large at high speed rotation, the resin temperature will not rise to the heating set temperature because ultra-high molecular weight polyethylene has a high melt viscosity and no kneading action occurs between flights. Product physical properties and appearance may be impaired. On the other hand, if it exceeds 36, the motor load becomes excessive and more power is consumed than necessary.
バレルにおいて、溝加工の長さがＬ／Ｄの１０％未満で
は超高分子量ポリエチレン粉末が安定して圧縮部へ移送
されず、又Ｌ／Ｄの４０％を越えると溶融した超高分子
量ポリエチレンが溝加工部に滞留し、ゲル化もしくは劣
化し、該劣化物等が超高分子量ポリエチレンに随伴し押
出成形物品の商品価値が低下する。更に溝長さがＬ／Ｄ
の４０％を越えるとシリンダー内部圧力の変動でスクリ
ュニにたわみが生じた場合、溝のエッヂ部でスクリュー
フライトが削り取られるという装置的なトラブルを生じ
易くなる。In the barrel, if the groove length is less than 10% of L/D, the ultra-high molecular weight polyethylene powder will not be stably transferred to the compression section, and if it exceeds 40% of L/D, the molten ultra-high molecular weight polyethylene will It stays in the grooved part and gels or deteriorates, and the degraded products accompany the ultra-high molecular weight polyethylene, reducing the commercial value of the extrusion molded article. Furthermore, the groove length is L/D
If it exceeds 40%, if the screw flight is deflected due to fluctuations in the internal pressure of the cylinder, equipment problems such as the screw flight being scraped off at the edge of the groove are likely to occur.
バレルの溝加工部には冷却機構を具備する必要があるが
、該冷却機構は超高分子量ポリエチレン粉末を溶融する
ことなく圧縮部へ移送するためにバレルを冷却するもの
であり、冷却機構がないと圧縮部で溶融した超高分子量
ポリエチレンの熱が溝加工部に伝わり、該溝加工部で超
高分子量ポリエチレン粉末が溶融し、回転方向のせん断
破壊を生じ易くなり、樹脂を圧縮部へ移送するための強
力な推進力が失われ、延いては、溶融した樹脂が溝加工
部に滞留することになる。It is necessary to equip the grooved part of the barrel with a cooling mechanism, but this cooling mechanism cools the barrel in order to transfer the ultra-high molecular weight polyethylene powder to the compression part without melting it, and there is no cooling mechanism. The heat of the ultra-high molecular weight polyethylene melted in the compression part is transmitted to the grooved part, and the ultra-high molecular weight polyethylene powder is melted in the grooved part, making it easy to cause shear failure in the rotational direction and transferring the resin to the compression part. The strong propulsion force for this will be lost, and as a result, the molten resin will remain in the grooved portion.
スクリューにおいて、圧縮部の長さがＬ／Ｄの２５％未
満では樹脂が急圧縮されることにガリ、この抵抗が溝加
工部の推進力に勝って樹脂とスクリューが共廻りし、押
出不能状態に陥り易くなる。一方、Ｌ／／Ｄの８０％を
越えると、必要以上にスクリューが長くなり、モーター
負荷が過大となり、使用電力の無駄を生じる０圧縮比が
１．０未満では、シリンダー壁面に対する樹脂の圧着応
力が小さく押出量が不安定になり、サージング現象や、
脱気不良による製品の物性低下及び外観不良を生じ易い
。一方、２．５を越えると溶融した超高分子量ボ１ノエ
チレンが過大に圧縮されることにより、溶融粘度が高い
ことと相まって圧縮部で閉塞現象を生じ易くなる。In a screw, if the length of the compression part is less than 25% of L/D, the resin will be compressed rapidly, and this resistance will overcome the propulsive force of the grooved part, causing the resin and screw to rotate together, making extrusion impossible. It becomes easy to fall into. On the other hand, if L//D exceeds 80%, the screw becomes longer than necessary, the motor load becomes excessive, and the power used is wasted. is small, the extrusion amount becomes unstable, and surging phenomenon occurs.
Deterioration of physical properties and poor appearance of the product are likely to occur due to poor deaeration. On the other hand, if it exceeds 2.5, the molten ultra-high molecular weight boroethylene is excessively compressed, which, combined with the high melt viscosity, tends to cause clogging in the compressed section.
フライトピッチが０．４Ｄ未満では、樹脂の推進は容易
になるが、回転数見合いの押出能力が低下し、一方１．
０を越えるとフライトの螺旋角度が大きくなり、樹脂と
スクリューの摩擦抵抗が増大し、推進力を失って閉塞現
象を生じ易くなる。又、スクリューの形状はフルフライ
ト型スクリューであり、スクリュー先端の樹脂計量部に
、混練作用を持たせた例えばダルメージタイ゛プのよう
なミキシングヘッドを有するタイプのスクリューは樹脂
の安定した前進を防害し、閉塞現象やモーター負荷の過
大を招くので好ましくない。If the flight pitch is less than 0.4D, the resin can be easily propelled, but the extrusion capacity commensurate with the number of revolutions will decrease;
If it exceeds 0, the helical angle of the flight increases, the frictional resistance between the resin and the screw increases, the propulsion force is lost, and a blockage phenomenon tends to occur. In addition, the shape of the screw is a full-flight type screw, and a type of screw that has a mixing head, such as a dalmage type, which has a kneading effect on the resin measuring part at the tip of the screw, prevents the stable advancement of the resin. , which is undesirable because it causes a blockage phenomenon and an excessive motor load.
以上述べたように単軸スクリュー押出機で超高分子量ポ
リエチレンの溶融、脱気を図りながら安定して押出すた
めには、半固体のスクリュー輸送という考え方に立ち、
本装置を発明するに至つた。As mentioned above, in order to extrude ultra-high molecular weight polyethylene stably while melting and degassing using a single-screw extruder, it is necessary to use the concept of semi-solid screw transport.
This led to the invention of this device.
尚、本発明において、Ｌとは押出機のホッパー下から先
端迄の長さであり、Ｄはバレルの内径である。In the present invention, L is the length from the bottom of the hopper to the tip of the extruder, and D is the inner diameter of the barrel.
本発明のスクリュー押出機を用いて超高分子量ポリエチ
レン粉末を押出成形する好適な方法は、供給部の温度を
樹脂の融点（１６６°Ｃ）以下、好ましくは２０ないし
５０°Ｃに設定し、樹脂粉末を溶融することなく圧縮部
へ移送し、圧縮部の温度を樹脂の融点（１３６°Ｃ）以
上ないし５５０°Ｃ１好ましくは２００ないし３００°
Ｃの範囲、圧縮比１．０ないし２．５、好ましくは１．
！Ｉないし１．８の範囲で樹脂粉末を溶融圧縮し、１８
０ないし５５０℃、好ましくは２００ないし３２０°Ｃ
に設定した計量部へ移送後ダイ外へ押出す方法である。A preferred method for extruding ultra-high molecular weight polyethylene powder using the screw extruder of the present invention is to set the temperature of the feed section below the melting point of the resin (166°C), preferably 20 to 50°C, and The powder is transferred to the compression section without melting, and the temperature of the compression section is set at a temperature higher than the melting point of the resin (136°C) to 550°C, preferably 200 to 300°C.
C range, compression ratio 1.0 to 2.5, preferably 1.
! Melt and compress resin powder in the range of I to 1.8,
0 to 550°C, preferably 200 to 320°C
This is a method in which the sample is transferred to a measuring section set to , and then extruded out of the die.
ダイとして内部にマンドレルを具備したチューブダイ、
アウターダイのみからなる丸棒状ダイ及びプロファイル
ダイ、サイジングダイ、冷却筒、引取機あるいは延伸槽
等を用いることによりチューブ、インフレーションフィ
ルム、ストランド、モノフィラメント、丸棒、シート及
びプロファイル等を安定して成形することができる。A tube die with a mandrel inside as a die,
Stable molding of tubes, blown films, strands, monofilaments, round bars, sheets, profiles, etc. by using round bar dies and profile dies consisting only of outer dies, sizing dies, cooling tubes, take-off machines, stretching tanks, etc. be able to.
本発明のスクリュー押出機はバレルの樹脂供給部に溝加
工を具備し、且つ緩圧縮のフルフライト型スクリューを
具備しているので、従来のスクリュー押出機に比べて、
分子量が極端に高い超高分子量ホリエチレン粉末の移送
力が増大し、且つ安定して押出すことができるので、従
来高価な２軸押用機が主流をなしていた超高分子量ポリ
エチレンの押出成形がより簡単に行えるようになった。The screw extruder of the present invention is equipped with grooves in the resin supply section of the barrel, and is equipped with a full-flight screw with slow compression, so compared to conventional screw extruders,
Ultra-high molecular weight polyethylene powder, which has an extremely high molecular weight, has an increased transport force and can be extruded stably, so extrusion molding of ultra-high molecular weight polyethylene has traditionally been carried out using expensive twin-screw extruders. is now easier to do.
又、本発明のスクリュー押出機は射出成形機の可塑化装
置としても使用出来るものであり、超高分子量ポリエチ
レンの射出成形がより簡単に、且つ安定して出来るよう
になった。Furthermore, the screw extruder of the present invention can be used as a plasticizing device for an injection molding machine, and injection molding of ultra-high molecular weight polyethylene can now be performed more easily and stably.
次に超高分子量ポリエチレン粉末押出成形用スクリュー
押出機の一実施例を図面に基づいて説明する。Next, one embodiment of a screw extruder for extruding ultra-high molecular weight polyethylene powder will be described based on the drawings.
本発明のスクリュー押出機１は第１図に示す如く、バレ
ル２とフルフライト型スクリュー３とから構成され、そ
の：Ｃ，／：Ｏ，すなわち供給部２２から押出機先端２
５との長さＬとバレル内径りとの比が２０ないしう６の
範囲にある。バレル２のホッパー４の下部に位置する樹
脂供給部２２から下流に流れ方向にＬ／Ｄの１０ないし
４０％の長さに溝２１が画成されている。該溝の形状は
第２〜７図に示す如く、矩形状、半円及び三角形状であ
り、その寸法は通常幅−！−Ｄないし一！−Ｄ ｍｍ
、好ましく５０ １０
は−Ｄないしｊ−Ｄ ｍｍ 、バレル内面からの深さ２
０ １０
１ １ １
−Ｄないしｓ ｏ Ｄ ｍｍ ｓ好ましくは６０Ｄない
し０
ａ ｏ Ｄ ｍｍの範囲である。又、溝２１は樹脂供給
部２２から下流に流れ方向に向かって深さが漸次浅くな
る所謂テーパー状であっても、あるいは所定の長さ迄同
じ深さであってもよい。更に、供給部２２から２７の原
料入口部のバレルについては溝がなくても特に押出性能
を阻害するものではない〇加工された溝２１の数は、通
常５本以上、好ましくは６ないし１２木の範囲である０
溝２１の数が６木未満では樹脂粉末が安定して圧縮部へ
移送されない虞れがある。As shown in FIG. 1, the screw extruder 1 of the present invention is composed of a barrel 2 and a full-flight screw 3.
The ratio between the length L and the barrel inner diameter is in the range of 20 to 6. A groove 21 is defined downstream from the resin supply section 22 located below the hopper 4 of the barrel 2 to have a length of 10 to 40% of L/D in the flow direction. The shapes of the grooves are rectangular, semicircular, and triangular, as shown in FIGS. 2 to 7, and their dimensions are usually width -! -D or one! -D mm
, preferably 50 10 is −D to j−D mm, depth 2 from the inner surface of the barrel
0 10 1 1 1 -D to soD mm s preferably in the range of 60D to 0 aoD mm. Further, the groove 21 may have a so-called tapered shape in which the depth gradually becomes shallower in the flow direction downstream from the resin supply section 22, or may have the same depth up to a predetermined length. Furthermore, even if the barrels at the raw material inlets of the feed sections 22 to 27 do not have grooves, this does not particularly impede extrusion performance. The number of grooves 21 processed is usually 5 or more, preferably 6 to 12. 0, which is in the range of
If the number of grooves 21 is less than six, there is a risk that the resin powder will not be stably transferred to the compression section.
バレル２の溝加工部２２〜２５は樹脂粉末を溶融させな
いために冷却機構を具備している。冷却機構はバレル２
を冷却できるものであればとくに限定はされないが、通
常は第１図の如くバレル２の内部に導管２６を設け、水
等の冷媒を通す機構が用いられる。The grooved parts 22 to 25 of the barrel 2 are equipped with a cooling mechanism to prevent the resin powder from melting. Cooling mechanism is barrel 2
Although there is no particular limitation as long as it can cool the air, normally a mechanism is used in which a conduit 26 is provided inside the barrel 2 and a refrigerant such as water is passed therethrough as shown in FIG.
バレル２の圧縮部２３〜２４及び計量部２４〜２５は加
熱機構を具備している。該加熱機構はバレル２に電熱ヒ
ーター、水蒸気導管、油導管等を埋設あるいは被覆する
機構が用いられる。The compression sections 23 to 24 and the metering sections 24 to 25 of the barrel 2 are equipped with a heating mechanism. As the heating mechanism, a mechanism in which an electric heater, a steam pipe, an oil pipe, etc. are buried or covered in the barrel 2 is used.
フルフライト型スクリュー６は供Ｍ部ｓｉ〜５２、圧縮
部５２〜３５及び計量部３５〜５４から構成されており
、供給部の３１〜ろ２の長さはＬ／Ｄの１０ないし４０
％の長さの範囲にあり、圧縮部５２〜３３の長さはＬ／
Ｄの２５ないし８０％の範囲にあり、計量部３３〜３４
の長さはＩ、／Ｄの質ないし２５％の範囲である。又、
スクリュー５の圧縮比は供給部３１の溝深さと計量部長
の溝深さとの比であり、１．０ないし２．５の範囲にあ
る０実施例１
第２図の如き溝を加工した第１図の如き押出機を用い、
超高分子量ポリエチレンを溶融押出した例について説明
する。The full-flight type screw 6 is composed of a feeding part si~52, a compression part 52~35, and a measuring part 35~54, and the length of the feeding part 31~filter 2 is 10~40 of L/D.
%, and the length of the compressed parts 52 to 33 is L/
D is in the range of 25 to 80%, and the measuring portions 33 to 34
The length of is in the range of 25% of the quality of I,/D. or,
The compression ratio of the screw 5 is the ratio of the groove depth of the supply section 31 to the groove depth of the metering section, and is in the range of 1.0 to 2.5. Using an extruder as shown in the figure,
An example in which ultra-high molecular weight polyethylene is melt-extruded will be explained.
シリンダー溝部のデザイン；
幅： １，５ｍｍ、深さ： ０，５ｍｍ、長さ：１４０
ｍｍ。Cylinder groove design; Width: 1.5mm, Depth: 0.5mm, Length: 140
mm.
本数：１２本
スクリュー外径 ：２０ｍｍφ
スクリュー有効長さくＬ／Ｄ）；２２
フライトピツチ ：１２ｍｍ一定
スクリユー圧縮比：１．８
ダ イ ：６ｍｍφ（丸棒）
上記押出機及びダイで、超高分子量ポリエチレン（商品
名ハイゼツクス■ミリオン２４ＱＭ。Number: 12 Screw outer diameter: 20mmφ Screw effective length L/D); 22 Flight pitch: 12mm Constant screw compression ratio: 1.8 Die: 6mmφ (round bar) The above extruder and die are made of ultra-high molecular weight polyethylene. (Product name Hi-Zex ■Million 24QM.
ＶＦＲ＝０．０１以下、〔η〕＝ １７ ｄ（１／ ｇ
ｓ融点＝１５６°Ｃ１三井石油化学（株）製）を溶融
押出した。Ｃ１、Ｃ２、Ｃ３のシリンダ一温度をそれぞ
れ２５℃、２８０℃、５００℃にし、Ｄｌ、Ｄ２のダイ
温度を２５０℃、１５５“Ｃにし、スクリュー回転数を
２５ ｒｐｍにし、サイジングダイ、引取機を用いて５
ｍｍφの丸棒を連続的に安定して得ることが出来た。VFR=0.01 or less, [η]=17 d(1/g
s melting point = 156°C (manufactured by Mitsui Petrochemical Co., Ltd.) was melt-extruded. The cylinder temperatures of C1, C2, and C3 were set to 25°C, 280°C, and 500°C, respectively, the die temperatures of Dl and D2 were set to 250°C, 155"C, the screw rotation speed was set to 25 rpm, and the sizing die and take-off machine were set. using 5
It was possible to continuously and stably obtain round bars of mmφ.
実施例２
実施例１に記した装置のスクリューに５ｍｍφのマンド
レルを連結したチューブダイに変更し、実施例１同等条
件で溶融押出した。サイジングダイ、引取機を用いて外
径５ｍｍφ、肉厚０．５ ｍｍの超高分子量ポリエチレ
ンチューブを連続的に安定して得ることができた。Example 2 The apparatus described in Example 1 was changed to a tube die in which a 5 mmφ mandrel was connected to the screw, and melt extrusion was carried out under the same conditions as Example 1. Using a sizing die and a drawing machine, an ultra-high molecular weight polyethylene tube having an outer diameter of 5 mmφ and a wall thickness of 0.5 mm could be continuously and stably obtained.
実施例３
シリンダー溝部デザイン；
巾： ２．５ｍｍ、深さ： ０．５ｍｍ、長さ’１８０
ｍｍ。Example 3 Cylinder groove design; width: 2.5 mm, depth: 0.5 mm, length '180
mm.
本数：１２本
スクリュー外径 ：３０ｍｍ
スクリュー有効長さく Ｌ／Ｄ ） ； ５４フライト
ピツチ ；２０ｍｍ
スクリュー圧縮比：１．８
ダ イ ：２２ｍｍφ（丸棒）
上記押出機及びダイで超高分子量ポリエチレン（ミリオ
ン２４０Ｍ）を溶融押出した。Ｃ１、Ｃ２、Ｃ３、Ｃ４
のシリンダ一温度を２５°Ｃ，２００°Ｃ，２６０°Ｃ
１２６０°Ｃとし、Ｄｌ、Ｄ２、Ｄ３、Ｄ４の温度を２
３０℃、２００°Ｑ、１６０℃、１５０℃とし、スクリ
ュー回転数を３０ ｒｐｍにし、引取機を用いて２２
ｍｍφの丸棒を連続的に安定して得ることができた。Number: 12 Screw outer diameter: 30mm Screw effective length L/D); 54 flight pitch; 20mm Screw compression ratio: 1.8 Die: 22mmφ (round bar) 240M) was melt extruded. C1, C2, C3, C4
cylinder temperature of 25°C, 200°C, 260°C
1260°C, and the temperature of Dl, D2, D3, and D4 is 2.
30°C, 200°Q, 160°C, 150°C, the screw rotation speed was 30 rpm, and the temperature was 22°C using a pulling machine.
It was possible to continuously and stably obtain round bars of mmφ.
第１図は本発明のスクリュー押出機の横断面図、第２図
、第６図及び第４図はバレルの樹脂供給部の縦断面図及
び第５図、第６図及び第７図はバレルの樹脂供給部の縦
断面の一部拡大図を表わす。
１・・・スクリュー押出機 ２・・・バレル６・・・ス
クリュー ２１・・・構
出願人 三井石油化学工業株式会社
代理人 山 口 和FIG. 1 is a cross-sectional view of the screw extruder of the present invention, FIGS. 2, 6, and 4 are longitudinal sectional views of the resin supply section of the barrel, and FIGS. 5, 6, and 7 are the barrel 3 shows a partially enlarged longitudinal cross-sectional view of the resin supply section of FIG. 1... Screw extruder 2... Barrel 6... Screw 21... Applicant Mitsui Petrochemical Industries Co., Ltd. Agent Kazu Yamaguchi
Claims (1)
クリュー押出機において、（１３バレル及ヒ（１１）フ
ルフライト型スクリューが下記要件（４）〜（Ｋ）を具
備していることを特徴とする超高分子量ポリエチレン粉
末押出成形用スクリュー押出機。 （Ｉ）バレル （Ａ） ：樹脂供給部にホッパー下から下流方向にＬ／
Ｄの１０〜４０％の範囲の長さに溝が画成され、且つ冷
却機構を具備して いること。 （Ｂ）：圧縮部及び計量部に加熱機構を具備しているこ
と。 （１）フッレフライト型スクリュー （Ｃ）：圧縮部の長さがＩＩＩＪ／Ｄの２５〜８０％の
範ω）；圧縮比が１．０ないし２．５の範囲であること
。 （Ｅ）：フライトピッチが０．４Ｄないし１．０Ｄの範
囲であること。(1) A full-flight screw extruder with I, /D of 20 to 36, characterized in that (13 barrels and h) (11) the full-flight screw satisfies the following requirements (4) to (K): A screw extruder for extrusion molding of ultra-high molecular weight polyethylene powder. (I) Barrel (A): L/
A groove is defined with a length in the range of 10 to 40% of D, and a cooling mechanism is provided. (B): The compression section and metering section must be equipped with a heating mechanism. (1) Fulleflite screw (C): The length of the compression part is in the range of 25 to 80% of IIIJ/D ω); The compression ratio is in the range of 1.0 to 2.5. (E): Flight pitch must be in the range of 0.4D to 1.0D.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59107511A JPS60250931A (en) | 1984-05-29 | 1984-05-29 | Screw extruder for super-high molecular polyethylene powder extrusion molding |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59107511A JPS60250931A (en) | 1984-05-29 | 1984-05-29 | Screw extruder for super-high molecular polyethylene powder extrusion molding |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS60250931A true JPS60250931A (en) | 1985-12-11 |
| JPH0138658B2 JPH0138658B2 (en) | 1989-08-15 |
Family
ID=14461051
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP59107511A Granted JPS60250931A (en) | 1984-05-29 | 1984-05-29 | Screw extruder for super-high molecular polyethylene powder extrusion molding |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS60250931A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62221519A (en) * | 1986-03-24 | 1987-09-29 | Mitsubishi Heavy Ind Ltd | Cylinder for raw material supplying zone of plasticizing apparatus |
| JP2021094835A (en) * | 2019-12-19 | 2021-06-24 | 東レ株式会社 | Single-shaft screw type extruder |
| WO2022163685A1 (en) * | 2021-01-29 | 2022-08-04 | 住友重機械モダン株式会社 | Extruder |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5190360A (en) * | 1975-02-07 | 1976-08-07 | ||
| JPS57113046A (en) * | 1980-08-01 | 1982-07-14 | Union Carbide Corp | Extrusion molding method for melted substance of linear ethylene copolymer, distribution of molecular weight thereof is narrow |
| JPS5826527U (en) * | 1981-08-13 | 1983-02-19 | 株式会社プラコ− | plastic extruder |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5826527B2 (en) * | 1978-01-31 | 1983-06-03 | 株式会社トキメック | Ultrasonic transmitter/receiver circuit |
-
1984
- 1984-05-29 JP JP59107511A patent/JPS60250931A/en active Granted
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5190360A (en) * | 1975-02-07 | 1976-08-07 | ||
| JPS57113046A (en) * | 1980-08-01 | 1982-07-14 | Union Carbide Corp | Extrusion molding method for melted substance of linear ethylene copolymer, distribution of molecular weight thereof is narrow |
| JPS5826527U (en) * | 1981-08-13 | 1983-02-19 | 株式会社プラコ− | plastic extruder |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62221519A (en) * | 1986-03-24 | 1987-09-29 | Mitsubishi Heavy Ind Ltd | Cylinder for raw material supplying zone of plasticizing apparatus |
| JP2021094835A (en) * | 2019-12-19 | 2021-06-24 | 東レ株式会社 | Single-shaft screw type extruder |
| WO2022163685A1 (en) * | 2021-01-29 | 2022-08-04 | 住友重機械モダン株式会社 | Extruder |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0138658B2 (en) | 1989-08-15 |
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