JP3680901B2 - Plastic mixing screw - Google Patents

Plastic mixing screw Download PDF

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Publication number
JP3680901B2
JP3680901B2 JP36202197A JP36202197A JP3680901B2 JP 3680901 B2 JP3680901 B2 JP 3680901B2 JP 36202197 A JP36202197 A JP 36202197A JP 36202197 A JP36202197 A JP 36202197A JP 3680901 B2 JP3680901 B2 JP 3680901B2
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JP
Japan
Prior art keywords
groove
ring
dispersion ring
stage dispersion
stage
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
JP36202197A
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Japanese (ja)
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JPH11170249A (en
Inventor
武仁 服部
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.)
Shibaura Machine Co Ltd
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Toshiba Machine Co 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
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Priority to JP36202197A priority Critical patent/JP3680901B2/en
Publication of JPH11170249A publication Critical patent/JPH11170249A/en
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Publication of JP3680901B2 publication Critical patent/JP3680901B2/en
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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
    • B29C48/67—Screws having incorporated mixing devices not provided for in groups B29C48/52 - B29C48/66

Description

【０００１】
【産業上の利用分野】
本発明はプラスチック用ミキシングスクリュに関する。
【０００２】
【従来技術】
従来からスクリュによりプラスチック材料を送る際の混練や顔料の分散性等の向上を目的として図５に示すようにスクリュ１の一部に形成された大径のプランジャ２の外周面に一端が解放され、他端が先止まり条溝３を夫々連通しないように３ａ、３ｂとして交互に逆方向に配置してデイスパージョンリング４としたプラスチック用ミキシングスクリュが周知である。
【０００３】
さらに混練や顔料の分散性等をより効率良くするため、図６に示すような溝５を隔てて１段目デイスパージョンリング６および２段目デイスパージョンリング７を直列に並べたミキシングスクリュ８も周知となっている。
【０００４】
【発明が解決しょうとする課題】
前述のように図５および図６のような構成のスクリュとすることにより樹脂材料を送る際の混練や顔料の分散等を向上させることができるものの、図６のような２段構成のデイスパージョンリングのスクリュであっても
【０００５】
【表１】

Figure 0003680901
【０００６】
に示すように顔料１に対して樹脂材料７９（以下８０倍樹脂）の顔料の分散テストではその分散性、特に５Kg/cm 2 のような低背圧における分散性は不十分で均一性が達成できなかった。
【０００７】
これは図７で示すように溶融樹脂は矢印Ａのようにデイスパージョンリング６の一端の解放部９から条溝６ａに入り、先端の先止まり部で塞き止められると、堤１０を乗越え、隣の下流部が解放されている条溝６ｂに入り、その解放部１１から溝５を経て２段目のデイスパージョンリング７の一端の解放部１２から条溝７ａに入り，次いで条溝７ｂから解放部１３を経てデイスパージョンリング６および７を通過するようになっていて、溶融樹脂がデイスパージョンリング６からデイスパージョンリング７に入る際、流れを変化させることがないので、混練や顔料の分散等が悪いと推定される。
【０００８】
本発明の目的は前述のような欠点を解消し、溶融樹脂が１段目のデイスパージョンリングから２段目のデイスパージョンリングに入る際、流れを変化させ、混練や顔料の分散等が良くなるプラスチック用ミキシングスクリュを提供することにある。
【０００９】
【課題を解決するための手段】
前述の目的を達成するため本発明はスクリュに加熱バレル内径面との間に小間隙を形成するプランジャ部を設け、このプランジャの外周面に一端が解放され、他端が先止まりの条溝を夫々連通しないように交互に逆方向に配置して１段目デイスパージョンリングとするとともに、溝を隔ててスクリュ先端側である下流に条溝が前記１段目デイスパージョンリングより多い条溝の２段目ディスパージョンリングを設けたことを特徴とするプラスチック用ミキシングスクリュとした。
【００１０】
また前記２段目ディスパージョンリングは条溝の捩じれ方向が前記１段目ディスパージョンリングのそれと逆向きであるとともに、条溝の他端が前方に貫通しており、かつスクリュ軸方向の幅が１段目ディスパージョンリング幅より狭いことを特徴とするプラスチック用ミキシングスクリュとした。
【００１１】
【発明の実施の形態】
次に本発明の実施形態を図１および図２により説明する。スクリュ２０には１段目ディスパージョンリング２１と２段目ディスパージョンリング２２が溝２３を隔てて直列に設けてあり、前者には従来と同じく一端が解放され、他端が先止まりの条溝２４を夫々連通しないように２４ａ、２４ｂとして交互に逆方向に配置し、後者には１段目ディスパージョンリング２１の条溝２４より多条で一端が解放され、他端が先止まりの条溝２５を夫々連通しないように２５ａ、２５ｂとして交互に逆方向に配置してある．
【００１２】
このように構成されているので、溶融樹脂は図２の矢印Ｂに示すように１段目デイスパージョンリング２１の一端の解放部２６から条溝２４ａに入り、先端の先止まり部で塞き止められると、堤２７を乗越え、隣の下流部が解放されている条溝２４ｂに入り、その解放部２８から溝２３を経て２段目デイスパージョンリング２２の条溝２５に入ることになるが、この条溝２５は前述のように１段目デイスパージョンリング２１の条溝２４より多い条溝となっており、条溝２４ｂの解放部２８は２段目デイスパージョンリング２２の条溝２５の解放部と対向していないので、前記解放部２８から吐出された溶融樹脂は流れを変えずに２段目デイスパージョンリング２２の条溝２５に入ることができないようにしてある。
【００１３】
従って条溝２４ｂの解放部２８から吐出された溶融樹脂は２段目デイスパージョンリング２２の１個の条溝２５ａばかりでなく、先隣の条溝２５ａａにも入るようになっていて、溶融樹脂は流れを細分化するため、混練や顔料の分散等が良くなる。
【００１４】
図３および図４により本発明の他の実施形態を説明すると、スクリュ３０には１段目ディスパージョンリング３１と２段目ディスパージョンリング３２が溝３３をへだてて直列に設けてあり、前者には従来と同じく一端が解放され、他端が先止まりの条溝３４を夫々連通しないように３４ａ、３４ｂとして交互に逆方向に配置し、後者には条溝の捩じれ方向が前記１段目ディスパージョンリング３１のそれより多く、捩じれ方向が逆向きの条溝３５が設けてある。
【００１５】
この条溝３５は溶融樹脂を逆流させるため、先止部を設けると下流に流れない恐れがあるため下流側に貫通しているばかりでなく、流動抵抗を少なくするためスクリュ軸方向の２段目ディスパージョンリング幅Ｌ2 が１段目ディスパージョンリング幅Ｌ1 より狭くしてある。
【００１６】
以上のような構成となっているため、図４に示すように溶融樹脂は矢印Ｃのように１段目ディスパージョンリングの条溝３４ａから隣の条溝３４ｂを経て、解放部３６から流出し、２段目ディスパージョンリング３２の条溝３５に入るに際し、条溝３５は１段目ディスパージョンリングの条溝３４より多く、従って溝幅は狭く、条溝３４ｂの解放部３６に１以上の条溝３５が対向しているので、解放部３６から流出した溶融樹脂が全部条溝３５ａに流れず、３５ｂ或いは３５ｃにも入り、細分化されて混練や顔料の分散等が良くなる。
【００１７】
本発明の１実施形態と他の実施形態および図６に示す従来のスクリュにおける顔料の分散テストの結果は表１に示すように従来スクリュで分散性の悪かった低背圧であっても良くなっており、分散性が改善されている。
【００１８】
【発明の効果】
以上説明したように本発明のスクリュは従来スクリュと比べ混練や顔料の分散性が改善された。
【図面の簡単な説明】
【図１】本発明のプラスチック用ミキシングスクリュの１実施形態図。
【図２】本発明のスクリュにおける樹脂の流れを説明した図。
【図３】本発明の他の実施形態図。
【図４】図３における樹脂の流れを説明した図。
【図５】従来スクリュの説明図。
【図６】他の従来スクリュの説明図。
【図７】図６における樹脂の流れを説明した図。
【符号の説明】
２０、３０ スクリュ
２１、３１ １段目ディスパージョンリング
２２、３２ ２段目ディスパージョンリング
２３、３３ 溝
２４、２５、３４、３５ 条溝
２６、２８ ，３６ 解放部
２７ 堤[0001]
[Industrial application fields]
The present invention relates to a plastic mixing screw.
[0002]
[Prior art]
Conventionally, one end is released on the outer peripheral surface of the large-diameter plunger 2 formed on a part of the screw 1 as shown in FIG. 5 for the purpose of improving the kneading and the dispersibility of the pigment when feeding the plastic material by the screw. A plastic mixing screw is known in which the dispersion ring 4 is arranged alternately in the opposite direction as 3a and 3b so that the other end stops and the groove 3 does not communicate with each other.
[0003]
Further, in order to make kneading and pigment dispersibility more efficient, a mixing screw in which a first stage dispersion ring 6 and a second stage dispersion ring 7 are arranged in series with a groove 5 as shown in FIG. 8 is also well known.
[0004]
[Problems to be solved by the invention]
As described above, the screw having the structure as shown in FIGS. 5 and 6 can improve the kneading and the dispersion of the pigment when the resin material is fed, but the two-stage disperser as shown in FIG. Even a John Ring screw [0005]
[Table 1]
Figure 0003680901
[0006]
As shown in Fig. 1, in the dispersion test of pigment of resin material 79 (hereinafter 80 times resin) with respect to pigment 1, its dispersibility, especially dispersibility at low back pressure such as 5 kg / cm 2 , is insufficient and uniformity is achieved. could not.
[0007]
As shown in FIG. 7, when the molten resin enters the groove 6a from the release portion 9 at one end of the dispersion ring 6 as shown by the arrow A and is blocked by the leading end portion at the tip, the molten resin gets over the bank 10. The adjacent downstream portion enters the open groove 6b, enters the groove 7a from the open portion 12 of the second stage dispersion ring 7 through the groove 5 from the open portion 11 and then into the groove 7a. Since the disperse ring 6 and 7 passes through the release part 13 from 7b and the molten resin does not change the flow when entering the disperse ring 7 from the disperse ring 6, It is estimated that kneading and pigment dispersion are poor.
[0008]
The object of the present invention is to eliminate the above-mentioned drawbacks, and when the molten resin enters the second stage dispersion ring from the first stage dispersion ring, the flow is changed, and kneading, pigment dispersion, etc. The object is to provide an improved plastic mixing screw.
[0009]
[Means for Solving the Problems]
In order to achieve the above-mentioned object, the present invention is provided with a plunger portion that forms a small gap between the inner diameter surface of the heating barrel in the screw, one end is released on the outer peripheral surface of this plunger, and the other end has a leading groove. The first stage dispersion ring is alternately arranged in the opposite direction so as not to communicate with each other, and there are more grooves on the downstream side of the screw tip side than the first stage dispersion ring. A mixing screw for plastics characterized in that a second stage dispersion ring was provided.
[0010]
The second stage dispersion ring has the direction of twisting of the groove opposite to that of the first stage dispersion ring, the other end of the groove penetrates forward, and has a width in the screw axis direction. The mixing screw for plastic is characterized by being narrower than the width of the first stage dispersion ring.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Next, an embodiment of the present invention will be described with reference to FIGS. The screw 20 has a first-stage dispersion ring 21 and a second-stage dispersion ring 22 provided in series with a groove 23 therebetween. 24 are arranged alternately in opposite directions as 24a and 24b so as not to communicate with each other, and in the latter, one end is released from the groove 24 of the first stage dispersion ring 21, and the other end is a leading groove. 25 are alternately arranged in opposite directions as 25a and 25b so as not to communicate with each other.
[0012]
Since it is configured in this way, the molten resin enters the groove 24a from the opening 26 at one end of the first stage dispersion ring 21 as shown by the arrow B in FIG. When it is stopped, it will go over the bank 27, enter the groove 24b where the adjacent downstream part is released, and enter the groove 25 of the second stage dispersion ring 22 through the groove 23 from the release part 28. However, as described above, the groove 25 has more grooves than the groove 24 of the first stage dispersion ring 21, and the release portion 28 of the groove 24 b is the groove of the second stage dispersion ring 22. Since it does not oppose the release part of the groove 25, the molten resin discharged from the release part 28 cannot enter the groove 25 of the second stage dispersion ring 22 without changing the flow.
[0013]
Accordingly, the molten resin discharged from the release portion 28 of the groove 24b can enter not only the single groove 25a of the second stage dispersion ring 22, but also the adjacent groove 25aa. Since the resin subdivides the flow, the kneading and pigment dispersion are improved.
[0014]
3 and 4, another embodiment of the present invention will be described. In the screw 30, a first stage dispersion ring 31 and a second stage dispersion ring 32 are provided in series with a groove 33 protruding in series. As in the prior art, one end is released, and the other end is arranged alternately in opposite directions as 34a and 34b so as not to communicate with the leading groove 34, and the latter has a twist direction of the groove in the first stage disperser. More than that of the John ring 31, a groove 35 having a reverse twist direction is provided.
[0015]
Since the groove 35 causes the molten resin to flow backward, if a stop portion is provided, the groove 35 may not flow downstream. Therefore, the groove 35 not only penetrates the downstream side, but also reduces the flow resistance in the second stage in the screw axis direction. The dispersion ring width L 2 is narrower than the first stage dispersion ring width L 1 .
[0016]
As shown in FIG. 4, the molten resin flows out from the release portion 36 through the adjacent groove 34b from the first groove 34a of the first stage dispersion ring as shown by the arrow C, as shown in FIG. When entering the groove 35 of the second-stage dispersion ring 32, the groove 35 is larger than the groove 34 of the first-stage dispersion ring, and therefore the groove width is narrow, and the release portion 36 of the groove 34b has one or more in the release portion 36. Since the grooves 35 are opposed to each other, all of the molten resin flowing out from the release portion 36 does not flow into the grooves 35a but also enters 35b or 35c and is subdivided to improve kneading, pigment dispersion, and the like.
[0017]
The results of the dispersion test of the pigment in one embodiment of the present invention, another embodiment, and the conventional screw shown in FIG. 6 may be a low back pressure that is poor in dispersibility in the conventional screw as shown in Table 1. And dispersibility is improved.
[0018]
【The invention's effect】
As described above, the screw of the present invention has improved kneading and pigment dispersibility compared to conventional screws.
[Brief description of the drawings]
FIG. 1 is a diagram showing one embodiment of a plastic mixing screw according to the present invention.
FIG. 2 is a diagram illustrating the flow of resin in the screw of the present invention.
FIG. 3 is another embodiment of the present invention.
FIG. 4 is a diagram illustrating the flow of resin in FIG. 3;
FIG. 5 is an explanatory diagram of a conventional screw.
FIG. 6 is an explanatory diagram of another conventional screw.
7 is a view for explaining the flow of resin in FIG. 6;
[Explanation of symbols]
20, 30 Screws 21, 31 First stage dispersion rings 22, 32 Second stage dispersion rings 23, 33 Grooves 24, 25, 34, 35 Strip grooves 26, 28, 36 Release part 27 Embankment

Claims (2)

スクリュに加熱バレル内径面との間に小間隙を形成するプランジャ部を設け、このプランジャの外周面に一端が解放され、他端が先止まりの条溝を夫々連通しないように交互に逆方向に配置して１段目デイスパージョンリングとするとともに、溝を隔ててスクリュ先端側である下流に条溝が前記１段目デイスパージョンリングより多い条溝の２段目ディスパージョンリングを設けたことを特徴とするプラスチック用ミキシングスクリュ。The screw is provided with a plunger portion that forms a small gap between the inner diameter surface of the heating barrel, one end is released on the outer peripheral surface of the plunger, and the other end is alternately reversed so as not to communicate with the leading groove. The first-stage dispersion ring is arranged, and a second-stage dispersion ring having a groove having a larger number of grooves than the first-stage dispersion ring is provided downstream of the first-stage dispersion ring with the groove therebetween. This is a mixing screw for plastics. 前記２段目ディスパージョンリングは条溝の捩じれ方向が前記１段目ディスパージョンリングのそれと逆向きであるとともに、条溝の他端が下流側に貫通しており、かつスクリュ軸方向の幅が１段目ディスパージョンリング幅より狭いことを特徴とする請求項１記載のプラスチック用ミキシングスクリュ。Wherein with 2-stage de I Spurgeon ring directional twist groove is opposite that facing the first stage dispersion ring, the other end of the groove extends through the downstream side, and the screw axis The plastic mixing screw according to claim 1, wherein the width is narrower than the width of the first stage dispersion ring.
JP36202197A 1997-12-11 1997-12-11 Plastic mixing screw Expired - Fee Related JP3680901B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
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Application Number Priority Date Filing Date Title
JP36202197A JP3680901B2 (en) 1997-12-11 1997-12-11 Plastic mixing screw

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Publication Number Publication Date
JPH11170249A JPH11170249A (en) 1999-06-29
JP3680901B2 true JP3680901B2 (en) 2005-08-10

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