JP2007007864A - Plasticator of on-line blending injection molding machine - Google Patents

Plasticator of on-line blending injection molding machine Download PDF

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JP2007007864A
JP2007007864A JP2005187527A JP2005187527A JP2007007864A JP 2007007864 A JP2007007864 A JP 2007007864A JP 2005187527 A JP2005187527 A JP 2005187527A JP 2005187527 A JP2005187527 A JP 2005187527A JP 2007007864 A JP2007007864 A JP 2007007864A
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screw
injection molding
molding machine
plasticator
resin material
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Kuniaki Endo
邦昭 遠藤
Osamu Segawa
修 瀬川
Takashi Hirose
高志 廣瀬
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Shibaura Machine Co Ltd
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Toshiba Machine Co Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a plasticator of an on-line blending injection molding machine improved in the distributing and dispersing mixing function of a resin material and capable of especially supplying the resin material, in which fluff or the like is allowed to get mixed, to the on-line blending injection molding machine in a stable extrusion amount. <P>SOLUTION: In the plasticator of the on-line blending injection molding machine constituted so that the resin material from a feeder is plasticated by the plasticator and the plasticated resin is supplied to an injection device to be injection-molded, the plasticator is constituted of a twin-screw extruder and its screw has a shape index D/d=1.7-1.8 (wherein D is the outer diameter of the screw and d is the trough diameter of the screw). <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

本発明はオンラインブレンド射出成形機の可塑化装置に係り、特にそのスクリュに関する。   The present invention relates to a plasticizing apparatus for an on-line blend injection molding machine, and more particularly to a screw thereof.

オンラインブレンド射出成形機はこの射出成形機に供給する樹脂材料をペレット化する必要がなく、樹脂材料製造工程から直接に供給することが出来、ペレット製造工程を省略することができるので最近用いられるようになってきた。   The online blend injection molding machine does not need to pelletize the resin material to be supplied to this injection molding machine, and can be supplied directly from the resin material manufacturing process, so that the pellet manufacturing process can be omitted, so that it is used recently. It has become.

そしてオンラインブレンド射出成形機においても樹脂材料の節約のためシート等の成形時に生ずるシート等の幅方向の両端部（耳部）を原料とする低嵩密度再生品（フラフ等）を１０％程度混入した原料を用いる成形をすることが行なわれるようになり、そのための可塑化装置、即ち押出機或いはそのスクリュに付いても種々検討されるようになった。
特開平５‐１３１５０９号公報 特開平７‐１１２４６７号公報 And in online blend injection molding machines, about 10% of low bulk density recycled products (such as fluffs) that are made from both ends (ears) in the width direction of the sheet, etc., produced during molding of the sheet, etc., are saved to save resin materials. Molding using such raw materials has been carried out, and various studies have been made on a plasticizing apparatus for that purpose, that is, an extruder or its screw.
JP-A-5-131509 Japanese Patent Laid-Open No. 7-112467

しかしながら従来のオンラインブレンド射出成形機の可塑化装置は単軸の押出機が多く用いられており、樹脂材料の分配混合及び分散混合機能の面で劣り安定した押出量を射出成形機に供給できなかった。特に前述のようなフラフ等を１０％程度混入した樹脂材料を用いる場合には押出機の樹脂材料供給部分の食込みが悪く、安定した押出量が得られなかった。   However, conventional on-line blend injection molding machine plasticizers are often single-screw extruders, and are inferior in terms of resin material distribution mixing and dispersion mixing functions, and cannot provide a stable extrusion amount to the injection molding machine. It was. In particular, when a resin material mixed with about 10% of the above-mentioned fluff or the like is used, the resin material supply portion of the extruder is poorly bitten, and a stable extrusion amount cannot be obtained.

発明者等は前述の従来可塑化装置における原料が安定した押出量が得られないことおよびフラフ等を混入した樹脂材料の食込みが悪いという問題に付いて種々検討した結果、可塑化装置は樹脂材料の分配混合及び分散混合機能の良い二軸押出機を用いれば良い。そしてフラフ等を混入した樹脂材料の場合には従来から当社ＩＳ‐１７０‐ＫＩＳ機に用いていたようにスクリュは外径Ｄ、谷径ｄとしたとき、スクリュ形状指標Ｄ／ｄ＝１．５〜１．６ではなく、それより流路断面積が４０％増大するスクリュ形状指標Ｄ／ｄ＝１．７〜１．８とすれば良いとの結論に達し、本発明となった。   As a result of various studies on the problems that the raw material in the above-described conventional plasticizing apparatus cannot obtain a stable extrusion amount and the bite of the resin material mixed with fluff etc. is poor, the plasticizing apparatus is a resin material. It is sufficient to use a twin screw extruder having good distribution mixing and dispersion mixing functions. In the case of a resin material mixed with fluff or the like, the screw shape index D / d = 1.5 when the screw has an outer diameter D and a valley diameter d as conventionally used in our IS-170-KIS machine. A conclusion was reached that the screw shape index D / d = 1.7 to 1.8, in which the channel cross-sectional area is increased by 40%, is not .about.1.6.

本発明の目的はオンラインブレンド射出成形機の可塑化装置において、樹脂材料の分配混合及び分散混合機能が良く、特にフラフ等を混入した樹脂材料であっても安定した押出量を射出成形機に供給できるオンラインブレンド射出成形機の可塑化装置を提供することである。   The object of the present invention is to provide a plastic material for an on-line blend injection molding machine, which has a good distribution and dispersion function of resin materials, and supplies a stable extrusion amount to an injection molding machine even for resin materials mixed with fluff and the like. It is to provide a plasticizing device for an on-line blend injection molding machine.

前述の目的を達成するため本発明はフィーダからの樹脂材料を可塑化装置により可塑化し、この可塑化樹脂を射出装置に供給し、射出成形を行うオンラインブレンド射出成形機の前記可塑化装置において、可塑化装置を二軸押出機とするとともに、そのスクリュは外径Ｄ、谷径ｄとしたとき形状指標Ｄ／ｄ＝１．７〜１．８を有することを特徴とするオンラインブレンド射出成形機の可塑化装置とした。   In order to achieve the above object, the present invention provides a plasticizer for an on-line blend injection molding machine that plasticizes a resin material from a feeder by a plasticizer, supplies the plasticized resin to an injection device, and performs injection molding. An on-line blend injection molding machine characterized in that the plasticizing apparatus is a twin-screw extruder and the screw has a shape index D / d = 1.7 to 1.8 when the outer diameter is D and the valley diameter is d. The plasticizing apparatus.

また前記スクリュは少なくともフィード部に形状指標Ｄ／ｄ＝１．７〜１．８を有することを特徴とすオンラインブレンド射出成形機の可塑化装置とした。   The screw has a shape index D / d = 1.7 to 1.8 at least in a feed portion, and is an on-line blend injection molding machine plasticizing device.

この発明によれば樹脂材料の分配混合及び分散混合機能が良く、特にフラフ等を混入した樹脂材料であっても安定した押出量を射出成形機に供給できるオンラインブレンド射出成形機の可塑化装置となった。   According to the present invention, a plasticizing device for an on-line blend injection molding machine capable of supplying a stable extrusion amount to an injection molding machine even if the resin material has a good distribution mixing and dispersion mixing function, especially a resin material mixed with fluff and the like. became.

本発明の１実施形態を図１ないし図３により本発明の１実施形態を説明すると、１はオンラインブレンド射出成形機で、モータ２により駆動されるフィーダ３を備えた可塑化装置である二軸押出機４と、同二軸押出機４により可塑化した樹脂材料を通過或いは一旦溜めておくアキュムレータ５と、このアキュムレータ５から送られて来る可塑化樹脂を射出成形する射出成形機（射出装置６のみ記載）からなる。   An embodiment of the present invention will be described with reference to FIGS. 1 to 3. An on-line blend injection molding machine 1 is a biaxial plasticizing apparatus having a feeder 3 driven by a motor 2. An extruder 4, an accumulator 5 that passes or temporarily stores the resin material plasticized by the twin-screw extruder 4, and an injection molding machine (injection device 6) that injection-molds the plasticized resin sent from the accumulator 5. Only described).

二軸押出機４のスクリュ７の回転は歯車箱９を介してモータ８で駆動されており、フィーダ３から供給口１０を経て二軸押出機４内に供給された樹脂材料はスクリュ７の回転によるせん断熱および図示してないヒータ等の加熱装置により可塑化され、可塑化樹脂となってアキュムレータ５に溜められ、射出成形機の射出工程時に弁１１が開かれ、可塑化樹脂が射出装置６に供給され、液圧によるプランジャ１２により射出される。   The rotation of the screw 7 of the twin screw extruder 4 is driven by the motor 8 through the gear box 9, and the resin material supplied from the feeder 3 through the supply port 10 into the twin screw extruder 4 is rotated by the screw 7. Is plasticized by a heating device such as a heater (not shown) or the like, and is made into a plasticized resin and stored in the accumulator 5. The valve 11 is opened during the injection process of the injection molding machine, and the plasticized resin is injected into the injection device 6. And injected by the plunger 12 by hydraulic pressure.

スクリュ７は図２および図３に示すように基部から先端にかけてフィード部Ｆ、混練部Ｃ、次いでポンピング部Ｐで構成されており、少なくともフィード部Ｆにおいてはスクリュ外径Ｄ、スクリュ谷径ｄとするとその形状指標Ｄ／ｄ＝１．７〜１．８と成っている。   As shown in FIGS. 2 and 3, the screw 7 is composed of a feed part F, a kneading part C, and then a pumping part P from the base to the tip. At least in the feed part F, the screw outer diameter D, the screw valley diameter d, Then, the shape index D / d = 1.7 to 1.8.

従って従来のスクリュがその形状指標Ｄ／ｄ＝１．５〜１．６であり、本発明のスクリュのスクリュ形状指標Ｄ／ｄ＝１．７〜１．８は流路断面積が４０％増大されており、押出量が増加し、かつ樹脂材料の混合、分散機能が良く、特にフラフ等を混入した樹脂材料であっても安定した押出量を得ることができ、押出機もその分１ランク下の押出機を使用することが出来、機械装置の据付面積も小型とすることが出来る。   Accordingly, the conventional screw has a shape index D / d = 1.5 to 1.6, and the screw shape index D / d = 1.7 to 1.8 of the screw of the present invention has a 40% increase in the cross-sectional area of the flow path. The amount of extrusion is increased, and the mixing and dispersing functions of the resin material are good. In particular, a stable extrusion amount can be obtained even with a resin material mixed with fluff, etc. The lower extruder can be used, and the installation area of the mechanical device can be reduced.

次に本発明の可塑化装置（二軸押出機）と従来の可塑化装置（二軸押出機）によるテスト結果を下記に示す。
●樹脂原料；（１）ＰＰペレット（モンテルＰＦ８１４、ＭＦＲ約４）
（２）ＰＰ＋タルク（元込３０％）：日本ミストロンＭＩＳＴＲОＮ８５０‐ＪＳ（平均粒子径４．５ミクロン）
（３）ＰＥＴフラフ（ボトルフレーク、嵩比重０．３０４）、フラフ（０・２２ｇ／ｃｃ）
●スクリュ；Ａ標準プロファイル（ＴＥＭ‐３７ＢＳ）
Ｂ深溝プロファイル（ＴＥＭ‐３７ＤＳ）
フリーボリューム
Ｄ／ｄ＝１．５２（標準スクリュ溝）、１．８０（本発明スクリュ溝）
バレル内径３７．０ｍｍ（標準）、３９．７ｍｍ（本発明）
により押出量等を比較した。
（１）ＰＰペレット
図４（イ）に示すように高粘度および高嵩密度の特性を有し、最高押出量はモータトルクによって制限されるが同一回転速度においては、本発明スクリュの比エネルギー（モータ消費動力）の低下分相当の増能力が可能で、その差は約１０％程度であった。
（２）ＰＰ＋タルク
図４（ロ）に示すように標準スクリュに比較し、本発明スクリュにおいては約１．４倍の押出量となり、スクリュボリュームの増大分に相当する。
この結果、低嵩密度の粉体原料は深溝により増能力が可能であることが理解される。
（３）ＰＥＴフラフ
図４（ハ）嵩密度が約０．３と低いため標準スクリュでは溝が浅く、大粒の原料はスクリュ溝内に入りにくく、フィード能力に劣るが、一方本発明スクリュは原料がスクリュ溝内に入りやすく、約１．６倍の押出量を得ることが出来た。
押出量の他、データの開示は省略するが、（１）ＰＰペレットにおいては最大で２０℃の温度低減が可能（６００ｍｉｎ−１）であり、これは本発明スクリュが低せん断混練特性が優れていることを示す。
また（２）ＰＰ＋タルクにおいて、本発明スクリュは各運転条件で５℃低い値を示した。
更に（３）ＰＥＴフラフにおいては本発明スクリュは従来スクリュと比較してもＰＥＴは低溶融粘度特性を示しせん断力の影響差はなかった。 Next, test results using the plasticizing apparatus (double-screw extruder) of the present invention and the conventional plasticizing apparatus (double-screw extruder) are shown below.
● Resin raw materials; (1) PP pellets (Montel PF814, MFR approx. 4)
(2) PP + talc (30% included): Nippon Mistron MISTON 850-JS (average particle size 4.5 microns)
(3) PET fluff (bottle flakes, bulk specific gravity 0.304), fluff (0.22 g / cc)
● Screw; A standard profile (TEM-37BS)
B deep groove profile (TEM-37DS)
Free volume
D / d = 1.52 (standard screw groove), 1.80 (present screw groove)
Barrel inner diameter 37.0 mm (standard), 39.7 mm (present invention)
The extrusion amount and the like were compared.
(1) PP pellet As shown in FIG. 4 (a), it has characteristics of high viscosity and high bulk density, and the maximum extrusion amount is limited by the motor torque, but at the same rotational speed, the specific energy ( The increase capability corresponding to the decrease in motor power consumption was possible, and the difference was about 10%.
(2) PP + talc As shown in FIG. 4 (b), compared to the standard screw, the screw of the present invention has an extrusion amount of about 1.4 times, which corresponds to an increase in screw volume.
As a result, it is understood that the low bulk density powder raw material can be increased in capacity by the deep groove.
(3) PET fluff Fig. 4 (c) Since the bulk density is as low as about 0.3, the standard screw has a shallow groove, and large raw materials are difficult to enter the screw groove and have poor feed ability. Was easy to enter the screw groove, and an extrusion amount of about 1.6 times could be obtained.
Although the disclosure of data is omitted in addition to the amount of extrusion, (1) PP pellets can be reduced to a maximum temperature of 20 ° C. (600 min −1 ), and the present invention screw has excellent low shear kneading characteristics. Indicates that
Further, in (2) PP + talc, the screw of the present invention showed a value 5 ° C. lower under each operating condition.
Furthermore, in (3) PET fluff, PET of the present invention showed low melt viscosity characteristics and there was no difference in influence of shearing force even when compared with conventional screws.

以上説明したように本発明スクリュは従来のスクリュと比較して優れた点が多く、十分にオンラインブレンド射出成形機の可塑化装置として使用可能である。   As described above, the screw of the present invention has many advantages as compared with the conventional screw and can be sufficiently used as a plasticizing device for an on-line blend injection molding machine.

前述の説明は液圧により駆動する射出装置を説明したが、本発明は図５に示すように全電動式の装置も使用可能である。その場合は可塑化装置であるニ軸押出機２０はモータ２１により歯車箱２２を介してスクリュ２３を回転駆動させ、溶融樹脂を一時蓄積するアキュムレータ２４はモータ２５がボールネジ２６を回転させることによりプランジャ２７を進退させ、射出装置のプランジャ２８はモータ２９がボールネジ３０を回転させることにより進退し、射出装置３１内に溶融樹脂を射出および蓄積を行う。   Although the above description has explained the injection device driven by hydraulic pressure, the present invention can also use an all-electric device as shown in FIG. In this case, the twin screw extruder 20 which is a plasticizing device rotates the screw 23 via a gear box 22 by a motor 21, and the accumulator 24 which temporarily accumulates molten resin has a plunger when a motor 25 rotates a ball screw 26. 27 is advanced and retracted, and the plunger 28 of the injection device advances and retracts when the motor 29 rotates the ball screw 30 to inject and accumulate molten resin in the injection device 31.

以上の説明は可塑化装置と射出装置の間にアキュムレータを設け、可塑化した溶融樹脂をアキュムレータを介して射出装置に供給する場合に付いて述べたが、これに限らず図６に示すように可塑化装置４０から溶融樹脂を直接にパイプ４２により射出装置４１に供給する方式のオンラインブレンド射出成形機にも使用可能であることは自明である。   In the above description, an accumulator is provided between the plasticizing device and the injection device, and the plasticized molten resin is supplied to the injection device via the accumulator. However, the present invention is not limited to this, as shown in FIG. It is obvious that the present invention can also be used for an on-line blend injection molding machine in which molten resin is directly supplied from the plasticizing device 40 to the injection device 41 through the pipe 42.

この発明によりオンラインブレンド射出成形機の可塑化装置は樹脂材料の分配混合及び分散混合機能が良く、特にフラフ等を混入した樹脂材料であっても安定した押出量および低温度で射出成形機に供給可能となった。   According to the present invention, the plasticizer of the on-line blend injection molding machine has a good distribution mixing and dispersion mixing function of the resin material. In particular, even a resin material mixed with fluff is supplied to the injection molding machine at a stable extrusion amount and at a low temperature. It has become possible.

この発明によるスクリュが適用される可塑化装置を備えたオンラインブレンド射出成形機の概要を示す説明面図である。It is explanatory drawing which shows the outline | summary of the online blend injection molding machine provided with the plasticizing apparatus to which the screw by this invention is applied. この発明による可塑化装のスクリュが適用される概要を示す説明面図である。It is explanatory drawing which shows the outline | summary to which the screw of the plasticizing apparatus by this invention is applied. この発明による可塑化装のスクリュが適用される概要を示す説明面図で、図２の断面Ａ‐Ａ図である。It is explanatory drawing which shows the outline | summary to which the screw of the plasticizing apparatus by this invention is applied, and is the cross-section AA figure of FIG. 本発明の可塑化装置と従来の可塑化装置による押出量のテスト結果を示すもので、（イ）（ロ）（ハ）は夫々、ＰＰペレット、ＰＰ＋タルク、ＰＥＴフラフの場合を示すグラフである。The test results of the amount of extrusion by the plasticizing apparatus of the present invention and the conventional plasticizing apparatus are shown. (A), (b) and (c) are graphs showing the cases of PP pellets, PP + talc and PET fluff, respectively. . この発明によるスクリュが適用される可塑化装置を備えたオンラインブレンド射出成形機の他の実施例を示す説明面図で、全電動式装置の概要説明図である。It is explanatory drawing which shows the other Example of the on-line blend injection molding machine provided with the plasticizing apparatus to which the screw by this invention is applied, It is a schematic explanatory drawing of an all-electric apparatus. この発明によるスクリュが適用される可塑化装置を備えたオンラインブレンド射出成形機の更に他の実施例を示す説明面図で、可塑化装置と射出装置の間にアキュムレータのない方式の概要説明図である。It is explanatory drawing which shows the further another Example of the online blend injection molding machine provided with the plasticizing apparatus to which the screw by this invention is applied, It is a schematic explanatory drawing of a system without an accumulator between the plasticizing apparatus and the injection apparatus. is there.

符号の説明Explanation of symbols

１ オンラインブレンド射出成形機
２、２１、２５ モータ
３ フィーダ
４、２０、４０ 二軸押出機
５、２４ アキュムレータ
６、３１、４１ 射出装置
７、２３ スクリュ
９、２２ 歯車箱
１０ 供給口
１１ 弁
１２、２７、２８ プランジャ
２６、３０ ボールネジ
４２ パイプ DESCRIPTION OF SYMBOLS 1 Online blend injection molding machine 2, 21, 25 Motor 3 Feeder 4, 20, 40 Twin screw extruder 5, 24 Accumulator 6, 31, 41 Injection device 7, 23 Screw 9, 22 Gear box 10 Supply port 11 Valve 12, 27, 28 Plunger 26, 30 Ball screw 42 Pipe

Claims (2)

フィーダからの樹脂材料を可塑化装置により可塑化し、この可塑化樹脂を射出装置に供給し、射出成形を行うオンラインブレンド射出成形機の前記可塑化装置において、可塑化装置を二軸押出機とするとともに、そのスクリュは外径Ｄ、谷径ｄとしたとき形状指標Ｄ／ｄ＝１．７〜１．８を有することを特徴とするオンラインブレンド射出成形機の可塑化装置。   In the plasticizing apparatus of the online blend injection molding machine in which the resin material from the feeder is plasticized by a plasticizing apparatus, this plasticized resin is supplied to the injection apparatus, and injection molding is performed, the plasticizing apparatus is a twin screw extruder. In addition, the plasticizer of the on-line blend injection molding machine characterized in that the screw has a shape index D / d = 1.7 to 1.8 when the outer diameter D and the valley diameter d are set. 前記スクリュは少なくともフィード部に形状指標Ｄ／ｄ＝１．７〜１．８を有することを特徴とする請求項１記載のオンラインブレンド射出成形機の可塑化装置。




2. The plasticizing device for an on-line blend injection molding machine according to claim 1, wherein the screw has a shape index D / d = 1.7 to 1.8 at least in a feed portion.




JP2005187527A 2005-06-28 2005-06-28 Plasticator of on-line blending injection molding machine Pending JP2007007864A (en)

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JP2012213996A (en) * 2011-04-01 2012-11-08 Polyplastics Co Process for producing pellets of glass-fiber-reinforced thermoplastic resin composition
JP2012213997A (en) * 2011-04-01 2012-11-08 Polyplastics Co Method of manufacturing glass fiber reinforced thermoplastic resin composition pellet
WO2013089097A1 (en) * 2011-12-14 2013-06-20 株式会社神戸製鋼所 Kneading segment
CN103753762A (en) * 2014-01-24 2014-04-30 广东富瑞精密机械有限公司 Graded storage injection molding machine
WO2016075846A1 (en) 2014-11-14 2016-05-19 三菱重工プラスチックテクノロジー株式会社 Injection molding method and injection molding apparatus

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JP2004284195A (en) * 2003-03-24 2004-10-14 Toshiba Mach Co Ltd Screws of twin-screw extruder

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2012213996A (en) * 2011-04-01 2012-11-08 Polyplastics Co Process for producing pellets of glass-fiber-reinforced thermoplastic resin composition
JP2012213997A (en) * 2011-04-01 2012-11-08 Polyplastics Co Method of manufacturing glass fiber reinforced thermoplastic resin composition pellet
WO2013089097A1 (en) * 2011-12-14 2013-06-20 株式会社神戸製鋼所 Kneading segment
JP2013123841A (en) * 2011-12-14 2013-06-24 Kobe Steel Ltd Kneading segment
CN103987503A (en) * 2011-12-14 2014-08-13 株式会社神户制钢所 Kneading segment
CN103753762A (en) * 2014-01-24 2014-04-30 广东富瑞精密机械有限公司 Graded storage injection molding machine
CN103753762B (en) * 2014-01-24 2016-04-13 广东富瑞精密机械有限公司 A kind of classification storing injection machine
WO2016075846A1 (en) 2014-11-14 2016-05-19 三菱重工プラスチックテクノロジー株式会社 Injection molding method and injection molding apparatus
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