JPH0138658B2 - - Google Patents
Info
- Publication number
- JPH0138658B2 JPH0138658B2 JP59107511A JP10751184A JPH0138658B2 JP H0138658 B2 JPH0138658 B2 JP H0138658B2 JP 59107511 A JP59107511 A JP 59107511A JP 10751184 A JP10751184 A JP 10751184A JP H0138658 B2 JPH0138658 B2 JP H0138658B2
- Authority
- JP
- Japan
- Prior art keywords
- screw
- length
- molecular weight
- ultra
- high molecular
- 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
Links
- 230000006835 compression Effects 0.000 claims description 31
- 238000007906 compression Methods 0.000 claims description 31
- 239000004699 Ultra-high molecular weight polyethylene Substances 0.000 claims description 30
- 229920000785 ultra high molecular weight polyethylene Polymers 0.000 claims description 30
- 239000011347 resin Substances 0.000 claims description 26
- 229920005989 resin Polymers 0.000 claims description 26
- 238000001125 extrusion Methods 0.000 claims description 17
- 239000000843 powder Substances 0.000 claims description 17
- 238000001816 cooling Methods 0.000 claims description 9
- 238000010438 heat treatment Methods 0.000 claims description 5
- 238000002844 melting Methods 0.000 description 7
- 230000008018 melting Effects 0.000 description 7
- 238000000034 method Methods 0.000 description 4
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 description 3
- 239000005977 Ethylene Substances 0.000 description 3
- 239000004698 Polyethylene Substances 0.000 description 3
- 230000006866 deterioration Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000001746 injection moulding Methods 0.000 description 3
- 230000000704 physical effect Effects 0.000 description 3
- -1 polyethylene Polymers 0.000 description 3
- 229920000573 polyethylene Polymers 0.000 description 3
- 238000004513 sizing Methods 0.000 description 3
- VXNZUUAINFGPBY-UHFFFAOYSA-N 1-Butene Chemical compound CCC=C VXNZUUAINFGPBY-UHFFFAOYSA-N 0.000 description 2
- KWKAKUADMBZCLK-UHFFFAOYSA-N 1-octene Chemical compound CCCCCCC=C KWKAKUADMBZCLK-UHFFFAOYSA-N 0.000 description 2
- NNBZCPXTIHJBJL-UHFFFAOYSA-N decalin Chemical compound C1CCCC2CCCCC21 NNBZCPXTIHJBJL-UHFFFAOYSA-N 0.000 description 2
- 238000007872 degassing Methods 0.000 description 2
- 238000004898 kneading Methods 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000000748 compression moulding Methods 0.000 description 1
- 229920001577 copolymer Polymers 0.000 description 1
- 229920006351 engineering plastic Polymers 0.000 description 1
- 235000012438 extruded product Nutrition 0.000 description 1
- 230000010006 flight Effects 0.000 description 1
- 238000001879 gelation Methods 0.000 description 1
- 229920001519 homopolymer Polymers 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- VLKZOEOYAKHREP-UHFFFAOYSA-N n-Hexane Chemical compound CCCCCC VLKZOEOYAKHREP-UHFFFAOYSA-N 0.000 description 1
- TVMXDCGIABBOFY-UHFFFAOYSA-N n-Octanol Natural products CCCCCCCC TVMXDCGIABBOFY-UHFFFAOYSA-N 0.000 description 1
- YWAKXRMUMFPDSH-UHFFFAOYSA-N pentene Chemical compound CCCC=C YWAKXRMUMFPDSH-UHFFFAOYSA-N 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 229920000098 polyolefin Polymers 0.000 description 1
- 230000001141 propulsive effect Effects 0.000 description 1
- QQONPFPTGQHPMA-UHFFFAOYSA-N propylene Natural products CC=C QQONPFPTGQHPMA-UHFFFAOYSA-N 0.000 description 1
- 125000004805 propylene group Chemical group [H]C([H])([H])C([H])([*:1])C([H])([H])[*:2] 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000003507 refrigerant Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- PXXNTAGJWPJAGM-UHFFFAOYSA-N vertaline Natural products C1C2C=3C=C(OC)C(OC)=CC=3OC(C=C3)=CC=C3CCC(=O)OC1CC1N2CCCC1 PXXNTAGJWPJAGM-UHFFFAOYSA-N 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 239000004711 α-olefin Substances 0.000 description 1
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
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
形に好適なスクリユー押出機に関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a screw extruder suitable for extrusion molding of ultra-high molecular weight polyethylene powder.
〔従来の技術〕
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ツク
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
つて成形することは非常に難しく、その殆どは圧
縮成形によつて成形されており、一部ロツド等が
極く低速で押出成形されているのが現状であつ
た。[Prior Art] 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, it has an extremely high melt viscosity and poor fluidity, so it is very difficult to mold it by extrusion molding or injection molding, and most of it is molded by compression molding. Currently, rods and the like are extruded at extremely low speeds.
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つてあるいは部分的に摩
擦力増大部を設定せしめたスクリユー押出機（特
開昭47−34455号公報）、スクリユーハウジング内
部の実質的に全長に亘つて、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
に亘つて長手方向に溝装置が画成されたスクリユ
ー押出機（特開昭50−139159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つ
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
リユー押出機が種々提案されている。これらバレ
ルに溝加工したスクリユ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
ユー内での滞留時間が長くなると、一部グル化あ
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。その現象は
特開昭50−139159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51−92868号公
報に具体的に開示されたスクリユーの如く、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ユ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。 On the other hand, as a method of increasing the amount of extrusion of molten resin, a screw extruder (Japanese Unexamined Patent Publication No. 47-34455) in which a frictional force increasing section is set over the entire length or partially of the inner peripheral surface of the barrel, and a screw housing are used. A screw extruder (Japanese Patent Publication No. 50-139159) in which a groove arrangement is defined in the longitudinal direction over substantially the entire length of the interior or over a major part of the length of the housing downstream of the feed zone of said housing. (Japanese Patent Laid-Open Publication No. 2003-120002), an extruder in which longitudinal grooves are formed along the inner surface of the first region of the extruder, which is constituted by a first high-viscosity inlet region and a second low-viscosity mixing and discharge region. 1971-
Various screw extruders with grooves formed on the inner surface of the barrel have been proposed, such as Japanese Patent No. 92868). Even if these screw extruders with grooved barrels are simply used for extrusion molding of 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 too long, some of it may become glued 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 in 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. This phenomenon also occurs in the device specifically disclosed in Japanese Patent Application Laid-open No. 50-139159. Furthermore, when a device with a compression ratio of 2 to 3.5, such as the screw specifically disclosed in JP-A-51-92868, is used, the molten ultra-high molecular weight polyethylene is more likely to rotate together with the screw, resulting in a stable It has drawbacks such as not being able to obtain a sufficient amount of extrusion.
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
クリユ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 have conducted various studies to improve the extrusion molding method for ultra-high molecular weight polyethylene powder. As a result, they have decided not only to create grooves on the barrel, but also to limit the range of groove processing and to create a specific shape. It was found that a uniform and stable extrusion amount could be obtained by combining the screw with a screw, and the present invention was achieved.
すなわち本発明は、(1)スクリユー有効長さ
（Ｌ／Ｄ）が20ないし36のフルフライト型スクリ
ユー押出機において、（）バレル及び（）フ
ルフライト型スクリユーが下記要件(A)〜(E)を具備
していることを特徴とする極限粘度〔η〕が
3.5dl／ｇ以上の超高分子量ポリエチレン粉末押
出成形用スクリユー押出機である。
That is, the present invention provides (1) a full-flight screw extruder with an effective screw length (L/D) of 20 to 36, in which () the barrel and () the full-flight screw meet the following requirements (A) to (E). The intrinsic viscosity [η] is
This is a screw extruder for extruding ultra-high molecular weight polyethylene powder of 3.5 dl/g or more.
（）バレル
(A)：樹脂供給部にホツパー下から下流方向にスク
リユー有効長さ（Ｌ／Ｄ）の10〜40％に相当す
る長さに溝が画成され、且つ冷却機構を具備し
ていること。() Barrel (A): A groove is defined in the resin supply section from below the hopper to a length corresponding to 10 to 40% of the screw effective length (L/D), and is equipped with a cooling mechanism. To be there.
(B)：圧縮部及び計量部に加熱機構を具備している
こと。(B): The compression section and metering section must be equipped with a heating mechanism.
（）フルフライト型スクリユー
(C)：圧縮部の長さがスクリユー有効長さ（Ｌ／
Ｄ）の25〜80％に相当する長さであること。() Full-flight screw (C): The length of the compression part is the screw effective length (L/
The length should be equivalent to 25 to 80% of D).
(D)：圧縮比が1.0ないし2.5の範囲であること。(D): Compression ratio must be in the range of 1.0 to 2.5.
(E)：フライトピツチが0.4Dないし1.0Dの範囲で
あること。(E): Flight pitch must be in the range of 0.4D to 1.0D.
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℃で測定した極限粘度
〔η〕が3.5dl／ｇ以上、好適には８ないし30d
／ｇで且つメルトフローレート（MFR：
ASTM Ｄ 1238，Ｆ）が0.01ｇ／10min以下の
エチレンの単独重合体もしくはエチレンと他のα
−オレフイン、例えばプロピレン、１−ブテン、
１−ヘキサン、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 3.5 dl/g or more, preferably 8 to 30 dl/g, as measured in a decalin solvent at 135°C.
/g and melt flow rate (MFR:
ASTM D 1238, F) 0.01g/10min or less homopolymer of ethylene or ethylene and other α
- olefins, such as propylene, 1-butene,
1-hexane, 1-octene, 4-methyl-1-
It is a crystalline powdery resin that is a copolymer with pentene etc. whose main component is ethylene.
本発明の超高分子量ポリエチレン粉末押出成形
用スクリユー押出機は前記した如く、押出機のス
クリユー有効長さ（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
下流に流れ方向にスクリユー有効長さ（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、圧縮部の長さがスクリユー有効長さ（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1.3ないし1.8
及びフライトピツチが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
クリユーとを具備したスクリユー押出機である。 As described above, the screw extruder for extrusion molding of ultra-high molecular weight polyethylene powder of the present invention has an effective screw length (L/D) of the extruder in the range of 20 to 36, preferably 26 to 30. Effective screw length (L/D) in downstream flow direction
A groove having a length of 10 to 40%, preferably 20 to 30% of The length is the screw effective length (L/
D) 25 to 80%, preferably 40 to 70%,
Compression ratio 1.0 to 2.5, preferably 1.3 to 1.8
and a full-flight type screw with a flight pitch ranging from 0.4D to 0.8D, preferably from 0.5D to 0.7D.
押出機のスクリユー有効長さ（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 effective screw length (L/D) of the extruder is less than 20 and the extrusion amount is large at high speed rotation, ultra-high molecular weight polyethylene has a high melt viscosity and no kneading action occurs between flights, so the resin will not reach the heating set temperature. The temperature may not rise and the physical properties and appearance of the product may be impaired. On the other hand, if it exceeds 36, the motor load will become excessive and more power will be consumed than necessary.
バレルにおいて、溝加工の長さがスクリユー有
効長さ（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
スクリユー有効長さ（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。更に溝長さがスクリユー有効長
さ（Ｌ／Ｄ）の40％を越えるとシリンダー内部圧
力の変動でスクリユーにたわみが生じた場合、溝
のエツヂ部でスクリユ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 the screw effective length (L/D), the ultra-high molecular weight polyethylene powder will not be stably transferred to the compression section, and the screw effective length (L/D) will not be stable. If it exceeds 40%, the molten ultra-high molecular weight polyethylene will remain in the grooved part and will gel or deteriorate, and the degraded products will accompany the ultra-high molecular weight polyethylene, reducing the commercial value of the extruded article. Furthermore, if the groove length exceeds 40% of the screw effective length (L/D) and the screw deflects due to fluctuations in cylinder internal pressure, there will be equipment trouble such as the screw flight being scraped off at the edge of the groove. becomes more 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
力な堆進力が失われ、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 accretion force is lost, and as a result, the molten resin ends up staying in the grooved portion.
スクリユーにおいて、圧縮部の長さがスクリユ
ー有効長さ（Ｌ／Ｄ）の25％未満では樹脂が急圧
縮されることになり、この抵抗が溝加工部の推進
力に勝つて樹脂とスクリユーが共廻りし、押出不
能状態に陥り易くなる。一方、スクリユー有効長
さ（Ｌ／Ｄ）の80％を越えると、必要以上にスク
リユーが長くなり、モーター負荷が過大となり、
使用電力の無駄を生じる。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ポ
リ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つて圧縮部で閉塞現象を生
じ易くなる。 In the screw, if the length of the compression part is less than 25% of the screw effective length (L/D), the resin will be compressed suddenly, and this resistance will overcome the propulsive force of the grooved part, causing the resin and the screw to coexist. It becomes easy to become unable to extrude. On the other hand, if it exceeds 80% of the screw effective length (L/D), the screw will become longer than necessary and the motor load will become excessive.
This results in wasted power usage. When the compression ratio is less than 1.0,
The compression stress of the resin against the cylinder wall surface is small and the extrusion rate becomes unstable, which tends to cause surging phenomena and deterioration of physical properties of the product due to poor degassing and poor appearance. On the other hand, if it exceeds 2.5, the molten ultra-high molecular weight polyethylene will be excessively compressed, and together with the high melt viscosity, a clogging phenomenon will easily occur in the compressed part.
フライトピツチが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、樹脂とスクリユーの摩擦抵抗が増大
し、推進力を失つて閉塞現象を生じ易くなる。
又、スクリユーの形状はフルフライト型スクリユ
ーであり、スクリユ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
ミキシングヘツドを有するタイプのスクリユーは
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, it will be easier to propel the resin, but the extrusion capacity will decrease in proportion to the number of revolutions.On the other hand, if it exceeds 1.0, the helical angle of the flight will increase, and the frictional resistance between the resin and the screw will increase. Propulsion force is lost and blockage phenomenon is likely to occur.
In addition, the shape of the screw is a full-flight type screw, and screws of the type that have a mixing head, such as a dalmage type, which has a kneading effect on the resin measuring part at the tip of the screw, prevent the stable advance 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ユー押出機で超高
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、半固体のスクリユー輪送
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 stably extrude ultra-high molecular weight polyethylene while melting and degassing it using a single-screw extruder, we developed this device based on the concept of semi-solid screw conveyance. Ivy.
尚、本発明において、Ｌとは押出機のホツパー
下から先端迄の長さであり、Ｄはバレルの内径で
ある。又、本発明において、スクリユー有効長さ
（Ｌ／Ｄ）ａ％に相当する長さとは、その長さを
ｂとしたとき式（ｂ／Ｄ／（Ｌ／Ｄ）×100＝ａ
を満たす値を意味する。 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. In addition, in the present invention, the length equivalent to the effective screw length (L/D) a% is a value that satisfies the formula (b/D/(L/D)×100=a, where the length is b) means.
本発明のスクリユ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（136℃）以下、好ま
しくは20ないし50℃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℃）以上ないし350℃、好ましくは
200ないし300℃の範囲、圧縮比1.0ないし2.5、好
ましくは1.3ないし1.8の範囲で樹脂粉末を溶融圧
縮し、180ないし350℃、好ましくは200ないし320
℃に設定した計量部へ移送後ダイ外へ押出す方法
である。ダイとして内部にマンドレルを具備した
チユーブダイ、アウターダイのみからなる丸棒状
ダイ及びプロフアイルダイ、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
りチユーブ、インフレーシヨンフイルム、ストラ
ンド、モノフイラメント、丸棒、シート及びプロ
フアイル等を安定して形成することができる。 A preferred method for extruding ultra-high molecular weight polyethylene powder using the screw extruder of the present invention is as follows:
The temperature of the supply section is set below the melting point of the resin (136℃), preferably 20 to 50℃, the resin powder is transferred to the compression section without melting, and the temperature of the compression section is set above the melting point of the resin (136℃). to 350℃, preferably
The resin powder is melted and compressed at a temperature of 200 to 300°C, a compression ratio of 1.0 to 2.5, preferably 1.3 to 1.8, and then 180 to 350°C, preferably 200 to 320°C.
In this method, the sample is transferred to a measuring section set at ℃ and then extruded out of the die. Tubes, blown films, strands, and monofilaments can be produced by using tube dies with a mandrel inside, round bar-shaped dies and profile dies consisting only of outer dies, sizing dies, cooling tubes, pulling machines, drawing tanks, etc. , round bars, sheets, profiles, etc. can be stably formed.
本発明のスクリユ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
型スクリユーを具備しているので、従来のスクリ
ユー押出機に比べて、分子量が極端に高い超高分
子量ポ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
押出機が主流をなしていた超高分子量ポリエチレ
ンの押出成形が単軸押出機により簡単に行えるよ
うになつた。又、本発明のスクリユー押出機は射
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つた。
The screw extruder of the present invention is equipped with grooves in the resin supply section of the barrel and a full-flight type screw with gentle compression, so compared to conventional screw extruders, it is possible to produce super high-quality materials with an extremely high molecular weight. Because the transport force of molecular weight polyethylene powder is increased and it can be extruded stably, extrusion molding of ultra-high molecular weight polyethylene, which was conventionally performed using expensive twin-screw extruders, can be easily performed using a single-screw extruder. It became like that. Furthermore, the screw extruder of the present invention can also be used as a plasticizing device for an injection molding machine, making injection molding of ultra-high molecular weight polyethylene easier and more stable.
次に超高分子量ポリエチレン粉末押出成形用ス
クリユー押出機の一実施例を図面に基づいて説明
する。
Next, an embodiment of a screw extruder for extruding ultra-high molecular weight polyethylene powder will be described based on the drawings.
本発明のスクリユー押出機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ユー３とか
ら構成され、そのスクリユー有効長さ（Ｌ／Ｄ）、
すなわち供給部２２から押出機先端２５との長さ
Ｌとバレル内径Ｄとの比が20ないし36の範囲にあ
る。バレル２のホツパー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スクリユー有効
長さ（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１／30Ｄないし１／10Ｄmm、好ましくは１／20
Ｄ
ないし１／10Ｄmm、バレル内面からの深さ１／70Ｄない
し１／30Ｄmm、好ましくは１／60Ｄないし１／40Ｄmmの
範
囲である。又、溝２１は樹脂供給部２２から下流
に流れ方向に向かつて深さが漸次浅くなる所謂テ
ーパー状であつても、あるいは所定の長さ迄同じ
深さであつてもよい。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。加工された
溝２１の数は、通常３本以上、好ましくは６ない
し12本の範囲である。溝２１の数が３本未満では
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, and the screw effective length (L/D) is
That is, the ratio between the length L from the supply section 22 to the extruder tip 25 and the barrel inner diameter D is in the range of 20 to 36. A groove 21 is defined downstream from the resin supply section 22 located below the hopper 4 of the barrel 2 in the flow direction with a length of 10 to 40% of the screw effective length (L/D). As shown in Figures 2 to 7, the shape of the groove is rectangular, semicircular, or triangular, and its dimensions are usually 1/30D to 1/10Dmm in width, preferably 1/20Dmm.
D to 1/10 Dmm, depth from the inner surface of the barrel ranges from 1/70 D to 1/30 Dmm, preferably 1/60 D to 1/40 Dmm. Further, the groove 21 may have a so-called tapered shape in which the depth gradually becomes shallower downstream from the resin supply section 22 in the flow direction, or may have the same depth up to a predetermined length. Furthermore, the supply units 22 to 27
Even if there is no groove in the barrel at the raw material inlet, this does not particularly impede extrusion performance. The number of machined grooves 21 is usually 3 or more, preferably in the range of 6 to 12. If the number of grooves 21 is less than three, 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２２〜２３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 23 of the barrel 2 are equipped with a cooling mechanism to prevent the resin powder from melting. The cooling mechanism is not particularly limited as long as it can cool the barrel 2, but usually the cooling mechanism can cool the barrel 2 as shown in Figure 1.
A mechanism is used in which a conduit 26 is provided inside and a refrigerant such as water is passed therethrough.
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。 Compression parts 23-24 and measuring part 24- of barrel 2
25 is 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ユー３は供給部３１〜３
２、圧縮部３２〜３３及び計量部３３〜３４から
構成されており、供給部の３１〜３２の長さはス
クリユー有効長さ（Ｌ／Ｄ）の10ないし40％の長
さの範囲にあり、圧縮部３２〜３３の長さはスク
リユー有効長さ（Ｌ／Ｄ）の25ないし80％の範囲
にあり、計量部３３〜３４の長さはスクリユー有
効長さ（Ｌ／Ｄ）の15ないし25％の範囲である。
又、スクリユー３の圧縮比は供給部３１の溝深さ
と計量部３３の溝深さとの比であり、1.0ないし
2.5の範囲にある。 The full flight type screw 3 has supply sections 31 to 3.
2. It is composed of compression sections 32 to 33 and metering sections 33 to 34, and the length of the supply sections 31 to 32 is in the range of 10 to 40% of the screw effective length (L/D). , the length of the compression parts 32 to 33 is in the range of 25 to 80% of the screw effective length (L/D), and the length of the measuring parts 33 to 34 is in the range of 15 to 80% of the screw effective length (L/D). It is in the range of 25%.
The compression ratio of the screw 3 is the ratio of the groove depth of the supply section 31 to the groove depth of the measuring section 33, and is between 1.0 and 3.
In the range of 2.5.
フライトピツチは0.4Dないし1.0Dの範囲にあ
る。 Flight pitch ranges from 0.4D to 1.0D.
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。Example 1 An example in which ultra-high molecular weight polyethylene was melt-extruded using an extruder as shown in FIG. 1 with grooves as shown in FIG. 2 will be described.
シリンダー溝部のデザイン；
幅：1.5mm、深さ：0.5mm、長さ：140mm、
本数：12本
スクリユー外径； 20mmφ
スクリユー有効長さ（Ｌ／Ｄ）； 22
圧縮部長さ； 220mm（Ｌ／Ｄの50％に相当）
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240M、MFR
＝0.01以下、〔η〕＝17d／ｇ、融点＝136℃、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℃、300℃
にし、D1、D2のダイ温度を250℃、155℃にし、
スクリユー回転数を25rpmにし、サイジングダ
イ、引取機を用いて５mmφの丸棒を連続的に安定
して得ることが出来た。Cylinder groove design: Width: 1.5mm, Depth: 0.5mm, Length: 140mm, Number: 12 Screw outer diameter: 20mmφ Screw effective length (L/D): 22 Compression length: 220mm (L/D Flight pitch; 12mm constant screw compression ratio; 1.8 die; 6mmφ (round bar) The above extruder and die are used to extrude ultra-high molecular weight polyethylene (trade name Hi-Zex Million 240M, MFR
= 0.01 or less, [η] = 17 d/g, melting point = 136°C, manufactured by Mitsui Petrochemical Co., Ltd.) was melt-extruded. C1 , C2 , C3
The cylinder temperature is 25℃, 280℃, 300℃ respectively.
and set the die temperature of D 1 and D 2 to 250℃ and 155℃,
By setting the screw rotation speed to 25 rpm and using a sizing die and a pulling machine, it was possible to continuously and stably obtain round bars with a diameter of 5 mm.
実施例 ２
実施例１に記した装置のスクリユーに５mmφの
マンドレルを連結したチユーブダイに変更し、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0.5mmの超
高分子量ポリエチレンチユ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 in Example 1. Using a sizing die and a drawing machine, ultra-high molecular weight polyethylene tubes with 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：180mm、
本数：12本
スクリユー外径； 30mm
スクリユー有効長さ（Ｌ／Ｄ）； 34
圧縮部長さ； 510mm（Ｌ／Ｄの50％に相当）
フライドピツチ； 20mm
スクリユー圧縮比； 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のシリンダー温度を25℃、200℃、260℃、260
℃とし、D1、D2、D3、D4の温度を230℃、200
℃、160℃、150℃とし、スクリユー回転数を
30rpmにし、引取機を用いて22mmφの丸棒を連続
的に安定して得ることができた。Example 3 Cylinder groove design; Width: 2.5 mm, Depth: 0.5 mm, Length: 180 mm, Number: 12 Screw outer diameter: 30 mm Screw effective length (L/D): 34 Compression length: 510 mm (L /D) Fried pitch; 20 mm Screw compression ratio; 1.8 Die; 22 mmφ (round bar) Ultra-high molecular weight polyethylene (Million 240M) was melt-extruded using the extruder and die described above. C1 , C2 , C3 ,
C 4 cylinder temperature 25℃, 200℃, 260℃, 260
℃, and the temperatures of D 1 , D 2 , D 3 , and D 4 are 230℃ and 200℃.
℃, 160℃, 150℃, screw rotation speed
By setting the speed to 30 rpm and using a pulling machine, it was possible to continuously and stably obtain round bars with a diameter of 22 mm.
比較例 １
実施例１に記した装置のスクリユーとして、ス
クリユー形状が汎用ポリオレフイン用であるもの
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。Comparative Example 1 An example will be described in which ultra-high molecular weight polyethylene was melt-extruded using a screw in the apparatus described in Example 1 whose screw shape was for general-purpose polyolefin.
圧縮部長さ ；40mm（Ｌ／Ｄの9.1％に相当）
フライドピツチ ；20mm一定
スクリユー圧縮比 ；3.5
上記以外は実施例１と同等条件で溶融押出を試み
た結果、樹脂がシリンダー内部（スクリユーの圧
縮部）で閉塞現象を生じ、丸棒を押出成形出来な
かつた。Compression section length: 40mm (equivalent to 9.1% of L/D) Fried pitch: 20mm Constant screw compression ratio: 3.5 As a result of attempting melt extrusion under the same conditions as Example 1 except for the above, it was found that the resin inside the cylinder (screw compression A blockage phenomenon occurred in part), and a round bar could not be extruded.
第１図は本発明のスクリユー押出機の横断面
図、第２図、第３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……スクリユー押出機、２……バレル、３…
…スクリユー、２１……溝。
Figure 1 is a cross-sectional view of the screw extruder of the present invention, Figures 2, 3 and 4 are longitudinal sectional views of the resin supply section of the barrel, and Figures 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, 3...
...screw, 21...groove.
Claims (1)
のフルフライト型スクリユー押出機において、
（）バレル及び（）フルライト型スクリユー
が下記要件(A)〜(E)を具備していることを特徴とす
る極限粘度〔η〕が3.5dl／ｇ以上の超高分子量
ポリエチレン粉末押出成形用スクリユー押出機。 （）バレル (A)：樹脂供給部にホツパー下から下流方向にスク
リユー有効長さ（Ｌ／Ｄ）の10〜40％に相当す
る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。 （）フルフライト型スクリユー (C)：圧縮部の長さがスクリユー有効長さ（Ｌ／
Ｄ）の25〜80％に相当する長さであること。 (D)：圧縮比が1.0ないし2.5の範囲であること。 (E)：フライトピツチが0.4Dないし1.0Dの範囲で
あること。[Claims] 1 Screw effective length (L/D) is 20 to 36
In the full-flight screw extruder,
For extrusion molding of ultra-high molecular weight polyethylene powder with an intrinsic viscosity [η] of 3.5 dl/g or more, characterized in that the () barrel and () full-light type screw satisfy the following requirements (A) to (E). Screw extruder. () Barrel (A): A groove is defined in the resin supply section from below the hopper to a length corresponding to 10 to 40% of the screw effective length (L/D), and is equipped with a cooling mechanism. To be there. (B): The compression section and metering section must be equipped with a heating mechanism. () Full-flight screw (C): The length of the compression part is the screw effective length (L/
The length should be equivalent to 25 to 80% of D). (D): Compression ratio must be 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 JPS60250931A (en) | 1985-12-11 |
| JPH0138658B2 true 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) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0741617B2 (en) * | 1986-03-24 | 1995-05-10 | 三菱重工業株式会社 | Cylinder for raw material supply of plasticizer |
| JPWO2022163685A1 (en) * | 2021-01-29 | 2022-08-04 |
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 |
| JPS5826527B2 (en) * | 1978-01-31 | 1983-06-03 | 株式会社トキメック | Ultrasonic transmitter/receiver circuit |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5826527U (en) * | 1981-08-13 | 1983-02-19 | 株式会社プラコ− | plastic extruder |
-
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 | ||
| JPS5826527B2 (en) * | 1978-01-31 | 1983-06-03 | 株式会社トキメック | Ultrasonic transmitter/receiver circuit |
| 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 |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS60250931A (en) | 1985-12-11 |
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