JP2003039514A - Preplastication type injection device - Google Patents
Preplastication type injection deviceInfo
- Publication number
- JP2003039514A JP2003039514A JP2001231874A JP2001231874A JP2003039514A JP 2003039514 A JP2003039514 A JP 2003039514A JP 2001231874 A JP2001231874 A JP 2001231874A JP 2001231874 A JP2001231874 A JP 2001231874A JP 2003039514 A JP2003039514 A JP 2003039514A
- Authority
- JP
- Japan
- Prior art keywords
- resin
- cylinder
- injection
- plunger
- tip
- 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
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/46—Means for plasticising or homogenising the moulding material or forcing it into the mould
- B29C45/53—Means for plasticising or homogenising the moulding material or forcing it into the mould using injection ram or piston
- B29C45/54—Means for plasticising or homogenising the moulding material or forcing it into the mould using injection ram or piston and plasticising screw
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
Abstract
Description
【発明の詳細な説明】
【０００１】
【発明の属する技術分野】この発明は、射出プランジャ
を内装した射出シリンダと、可塑化スクリュを内装した
可塑化シリンダとを樹脂路により連通したプリプラ式射
出装置に関するものである。
【０００２】
【従来の技術】図３及び図４は従来のプリプラ式射出装
置を示すもので、１は射出シリンダ、２は射出シリンダ
の上に並設した可塑化シリンダで、両シリンダは先端部
間に設けた樹脂路３により連通している。
【０００３】上記射出シリンダ１は先端にノズル４を有
し、内部に射出プランジャ５を進退自在に有する。この
射出プランジャ５の先端面６は円錐面に形成してある。
また射出シリンダ１の先端内面７は、プランジャ先端面
６と対応する漏斗状に形成してあり、その中央に上記ノ
ズル４と接続した射出口８が設けてある。また射出口８
の上部のシリンダ先端内面７に上記樹脂路３の流入口９
が開設してある。
【０００４】このような構成では、上記可塑化シリンダ
２が内装するスクリュ１０の回転により樹脂（図は省
略）が可塑化され、さらに樹脂は樹脂路３を通って射出
シリンダ１のシリンダ先端部内に流入する。射出シリン
ダ１には射出完了後の射出プランジャ５が前進限に位置
しているので、背圧力を加えられた射出プランジャ５
は、図４に示すように、樹脂圧により設定位置まで後退
して可塑化した樹脂の計量が行われる。その後に射出プ
ランジャ５は前進移動して計量した樹脂を金型へ射出充
填する。
【０００５】
【発明が解決しようとする課題】このようにシリンダ先
端にて可塑化した樹脂の供給を行うと、成形品中に樹脂
の焼けや炭化による黒点が生じ易い。また樹脂の熱履歴
にも違いが生ずるという課題を有する。
【０００６】これらの課題の発生には幾つかの原因が挙
げられるが、プリプラ式射出装置では先に供給した樹脂
が射出時には後から射出充填されることになるので、主
としてプランジャ先端面６とシリンダ先端内面７との間
にクッション１１として介在させた樹脂の長期滞留が原
因と考えられる。
【０００７】樹脂の射出充填時の射出プランジャ５の前
進は、プランジャ先端面６とシリンダ先端内面７との間
に、５ミリ程度の厚さで樹脂がクッション１１として介
在する所までで、その位置で射出プランジャ５による樹
脂の保圧を行い、保圧完了後に上記樹脂路の遮断を解除
して、上記樹脂の計量を行っている。
【０００８】この射出プランジャ５の後退時にクッショ
ン１１として残した樹脂は、計量時に樹脂路９から流入
する樹脂によりプランジャ先端面６やシリンダ先端内面
７から殺ぎ落とされるように取り除かれるとされている
が、その流入口９の対向面側では樹脂が残り易く、これ
がショットごとに溜って長期滞留すると、加熱により徐
々に変色して焼けとなり、さらには黒く炭化するなど変
質を起こす。
【０００９】この変質樹脂は繰り返し行われる成形の途
中で細かく崩れやすく、これが射出される樹脂に混入す
ると、成形品中の黒点として現れて瑕疵となる。このよ
うなことから、その解決策としてクッション量をできる
だけ少なく条件設定し、樹脂の長期滞留を抑制するなど
している。
【００１０】この発明は、上記従来の課題を解決するた
めに考えられたものであって、その目的は、これまでシ
リンダ先端内面の中心に設けられ射出口を、樹脂の流入
口の対面側にずらせて設けるという簡単な手段の採用に
より、樹脂の長期滞留が一原因とされる焼けや黒点など
の成形品の瑕疵を防止でき、また射出充填される樹脂の
熱履歴の違いも改善することができる新たなプリプラ式
斜射出装置を提供することにある。
【００１１】
【課題を解決するための手段】上記目的によるこの発明
は、射出プランジャを内装した射出シリンダと、可塑化
スクリュを内装した可塑化シリンダとを、両シリンダの
先端部間に設けた樹脂路により連通し、その樹脂路の流
入口を円錐形のプランジャ先端面と適合するシリンダ先
端内面に開設したプリプラ式射出装置において、上記シ
リンダ先端内面の射出口をシリンダ中心から上記流入口
の対面側にずらせ、その射出口まで対面側のシリンダ先
端面をプランジャ先端面より緩斜面に形成して、対向面
側のシリンダ先端面とプランジャ先端面との間に射出口
が臨む樹脂溜りを形成してなる、というものである。
【００１２】
【発明の実施の形態】図１及び図２は、この発明の１実
施形態を示すもので、図３及び図４に例示する従来構造
と同一の部分については同一符号を付して詳説する。
【００１３】射出シリンダ１は先端にノズル４を有し、
内部に先端面６を円錐面に形成した射出プランジャ５を
進退自在に有する。図示の先端角度は９０°で描かれて
いるが、通常その角度は装置の大きさにより異なり４０
°〜１２０°の範囲に設定されている。
【００１４】射出シリンダ１の先端内面７はプランジャ
先端面６と対応する漏斗状に形成してあり、その上部に
上記樹脂路３の流入口９が開設してある。また上記ノズ
ル４と接続した射出口８はシリンダ中心から上記流入口
９と対面する下側にずらせて設けてあり、その射出口８
まで対面側のシリンダ先端面７ａをプランジャ先端面６
より緩斜面に形成して、対向面側のシリンダ先端面７ａ
とプランジャ先端面６の下側との間に射出口８が臨む樹
脂溜り１２を形成している。なお、緩斜面の角度は射出
口８の設定位置によって異なる。
【００１５】上記構成では、金型とのノズルタッチによ
りノズル４が閉塞され、また図１に示すように、射出プ
ランジャ５が前進限に位置している状態で、上記可塑化
シリンダ２から樹脂路３を通して射出シリンダ１に新た
な樹脂が圧送されると、樹脂は流入口９からプランジャ
先端面６とシリンダ先端面７との隙間に入り込んで、流
入口９と対向する下側の樹脂溜り１２へと流入する。樹
脂溜り１２には前回の射出充填で残された樹脂が充満て
いるので、そこに新たな樹脂が上部の両側の間隙から圧
入されることになり、これにより樹脂溜り１２では樹脂
圧が射出プランジャ５に加えられた背圧力を上回るまで
の間、新旧樹脂の混ざりが生ずるようになる。
【００１６】プランジャ先端の樹脂圧が背圧力より高く
なると、射出プランジャ５は後退移動を開始し、それに
伴ってシリンダ先端内が拡張され、図２に示すように、
流入口９からの樹脂の計量が行われる。またシリンダ先
端内では射出プランジャ５の後退移動により、閉鎖状態
にある射出口８側よりも、射出プランジャ５側の流動抵
抗が低いことから樹脂は射出プランジャ５を加圧しなが
らシリンダ内へと計量され、新旧樹脂が混ざった樹脂溜
り１２の樹脂の殆どが射出口８側に滞留するようにな
る。
【００１７】新たな樹脂の計量が完了したのち樹脂路３
を閉じ、射出プランジャ５を前進移動して射出充填を行
うと、射出口８側に滞留した樹脂溜り１２の樹脂が先ず
ノズル４から射出される。射出プランジャ５が前進限ま
で移動して停止すると、新たに樹脂溜り１２に残留した
樹脂が保圧時のクッションとなる。そして新たな樹脂が
上部の両側の間隙から圧入されてくると、その樹脂と混
ざって次の射出充填でそ真っ先に射出口８からノズル４
を通って図示しない金型に押し出されてゆく。
【００１８】このように樹脂溜り１２に残留した樹脂
は、それが先に供給されて流入口９の対向面側に残った
樹脂であっても、供給と射出の繰返しにより先に射出口
８から射出されるので長期滞留することがなく、またプ
ランジャ先端面６とシリンダ先端内面７との間隙にクッ
ションとして介在した樹脂は、樹脂路９からの新たな樹
脂により殺ぎ落とされるので、それらによる樹脂の焼け
や炭化は生じ難いものとなり、樹脂の熱履歴にも差が生
ずるようなこともない。したがって、シリンダ先端から
可塑化した樹脂の供給を行うプリプラ式射出装置におけ
る成形品中の樹脂の焼けや炭化による瑕疵を解決するこ
とができる。Description: BACKGROUND OF THE INVENTION [0001] 1. Field of the Invention [0002] The present invention relates to a prepra-type injection device in which an injection cylinder containing an injection plunger and a plasticizing cylinder containing a plasticizing screw are connected by a resin path. It is about. 2. Description of the Related Art FIGS. 3 and 4 show a conventional pre-plastic injection apparatus, in which 1 is an injection cylinder, 2 is a plasticizing cylinder juxtaposed on the injection cylinder, and both cylinders have tip portions. They are communicated by a resin path 3 provided therebetween. The injection cylinder 1 has a nozzle 4 at the tip and an injection plunger 5 therein so as to be able to advance and retreat. The tip surface 6 of the injection plunger 5 is formed as a conical surface.
The inner surface 7 of the distal end of the injection cylinder 1 is formed in a funnel shape corresponding to the distal end surface 6 of the plunger, and an injection port 8 connected to the nozzle 4 is provided at the center. Injection port 8
An inlet 9 of the resin path 3 is provided on the inner surface 7 of the cylinder tip above the cylinder.
Has been established. In such a configuration, the resin (not shown) is plasticized by rotation of the screw 10 inside the plasticizing cylinder 2, and the resin is further passed through the resin passage 3 and into the cylinder tip of the injection cylinder 1. Inflow. Since the injection plunger 5 after the completion of the injection is located at the forward limit in the injection cylinder 1, the injection plunger 5 to which the back pressure has been applied.
As shown in FIG. 4, the plasticized resin is retracted to the set position by the resin pressure and the plasticized resin is measured. Thereafter, the injection plunger 5 moves forward and injects and fills the measured resin into the mold. [0005] When the plasticized resin is supplied at the tip of the cylinder as described above, black spots are easily generated in the molded product due to burning or carbonization of the resin. There is also a problem that a difference occurs in the thermal history of the resin. There are several causes for the occurrence of these problems. However, in the pre-plastic type injection device, the resin supplied earlier is injected and filled at the time of injection. It is considered that the cause is a long-term residence of the resin interposed as the cushion 11 between the inner surface 7 and the tip. The injection plunger 5 is advanced when the resin is injected and filled, at a position where the resin is interposed as a cushion 11 with a thickness of about 5 mm between the plunger tip surface 6 and the cylinder tip inner surface 7 at that position. The pressure of the resin is maintained by the injection plunger 5, and after the completion of the pressure holding, the cutoff of the resin path is released, and the resin is measured. The resin remaining as the cushion 11 when the injection plunger 5 is retracted is removed so as to be killed off the plunger tip surface 6 and the cylinder tip inner surface 7 by the resin flowing from the resin passage 9 at the time of measurement. However, the resin tends to remain on the side facing the inflow port 9, and if the resin accumulates for each shot and stays for a long period of time, the color gradually changes due to heating and burns, and further, the carbon blacks and deteriorates such as carbonization. [0009] The deteriorated resin easily breaks down in the middle of repeated molding, and when mixed with the injected resin, it appears as a black spot in the molded product and becomes a defect. For this reason, as a solution to this, conditions are set such that the cushion amount is as small as possible to suppress long-term stagnation of the resin. The present invention has been conceived in order to solve the above-mentioned conventional problems, and an object of the present invention is to provide an injection port which has been provided at the center of the inner surface of the cylinder tip so far so as to face the resin inlet. By adopting a simple means of displacing, it is possible to prevent defects of molded products such as burns and black spots caused by long-term residence of resin, and to improve the difference in thermal history of injection-filled resin. It is to provide a new pre-plastic oblique injection device that can be used. According to the present invention, there is provided a resin having an injection cylinder containing an injection plunger and a plasticizing cylinder containing a plasticizing screw provided between the distal ends of both cylinders. In a pre-plastic injection device in which the inflow port of the resin path is opened on the inner surface of the cylinder tip that matches the tip surface of the conical plunger, the injection port on the inner surface of the cylinder tip faces the inflow port from the center of the cylinder to the inflow port The cylinder tip surface on the opposite side up to the injection port is formed at a gentler slope than the plunger tip surface, and a resin reservoir where the injection port faces between the cylinder tip surface on the opposite surface side and the plunger tip surface is formed. It is. FIG. 1 and FIG. 2 show an embodiment of the present invention. In FIG. 1 and FIG. 2, the same parts as those of the conventional structure shown in FIGS. Explain in detail. The injection cylinder 1 has a nozzle 4 at the tip,
An injection plunger 5 having a front end surface 6 formed in a conical surface is provided inside so as to be able to advance and retreat. Although the illustrated tip angle is drawn at 90 °, the angle usually differs depending on the size of the device and is 40 °.
The angle is set in the range of ° to 120 °. An inner surface 7 of the tip of the injection cylinder 1 is formed in a funnel shape corresponding to the tip surface 6 of the plunger, and an inlet 9 of the resin passage 3 is opened above the funnel. The injection port 8 connected to the nozzle 4 is provided so as to be shifted from the center of the cylinder to the lower side facing the inflow port 9.
Up to the plunger tip surface 6a.
Formed on a gentler slope, the cylinder tip surface 7a on the opposite surface side
A resin reservoir 12 is formed between the plunger and the lower side of the plunger tip surface 6 so that the injection port 8 faces. Note that the angle of the gentle slope varies depending on the set position of the injection port 8. In the above configuration, when the nozzle 4 is closed by the nozzle touch with the mold, and as shown in FIG. When new resin is pressure-fed to the injection cylinder 1 through 3, the resin enters the gap between the plunger tip surface 6 and the cylinder tip surface 7 from the inflow port 9, and flows into the lower resin reservoir 12 facing the inflow port 9. And inflow. Since the resin pool 12 is filled with the resin left by the previous injection filling, new resin is injected into the resin pool 12 from the gaps on both upper sides. Until the back pressure applied to 5 is exceeded, mixing of the old and new resins will occur. When the resin pressure at the tip of the plunger becomes higher than the back pressure, the injection plunger 5 starts to move backward, and the inside of the tip of the cylinder expands accordingly, as shown in FIG.
The resin is metered from the inlet 9. Further, since the flow resistance of the injection plunger 5 is lower than that of the injection port 8 in the closed state due to the backward movement of the injection plunger 5 in the cylinder tip, the resin is measured into the cylinder while pressurizing the injection plunger 5. Most of the resin in the resin pool 12 in which the old and new resins are mixed stays at the injection port 8 side. After the new resin has been measured, the resin path 3
Is closed and the injection plunger 5 is moved forward to perform injection filling, the resin in the resin pool 12 remaining on the injection port 8 side is first injected from the nozzle 4. When the injection plunger 5 moves to the forward limit and stops, the resin newly remaining in the resin reservoir 12 serves as a cushion during pressure holding. Then, when new resin is press-fitted from the gaps on both sides of the upper portion, the new resin is mixed with the resin, and the next injection filling is performed immediately before the injection port 8 through the nozzle 4.
And is pushed out by a mold (not shown). Even if the resin remaining in the resin reservoir 12 is supplied first and remains on the side facing the inflow port 9, the resin remaining in the resin reservoir 12 is first supplied from the injection port 8 by repeating supply and injection. Since the resin is injected, it does not stay for a long time, and the resin interposed as a cushion in the gap between the plunger tip surface 6 and the cylinder tip inner surface 7 is killed by the new resin from the resin path 9, so that the resin Burning and carbonization hardly occur, and there is no difference in the thermal history of the resin. Therefore, it is possible to solve a defect due to burning or carbonization of the resin in the molded product in the pre-plastic injection device that supplies the plasticized resin from the tip of the cylinder.
【図面の簡単な説明】
【図１】 この発明に係わるプリプラ式射出装置の計量
開始時の先端部縦断面図である。
【図２】 同じく射出充填開始時の先端部縦断面図であ
る。
【図３】 従来のプリプラ式射出装置の計量開始時の先
端部縦断面図である。
【図４】 同じく射出充填開始時の先端部縦断面図であ
る。
【符号の説明】
１ 射出シリンダ
２ 可塑化シリンダ
３ 樹脂路
４ ノズル
５ 射出プランジャ
６ プランジャ先端面
７ シリンダ先端面
７ａ 対向面側のシリンダ先端面
８ 射出口
９ 流入口
１１ クッション
１２ 樹脂溜りBRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a vertical cross-sectional view of a leading end portion of a pre-plastic injection device according to the present invention at the start of measurement. FIG. 2 is a vertical cross-sectional view of a tip portion at the same time when injection filling is started. FIG. 3 is a vertical cross-sectional view of a tip portion of a conventional pre-plastic injection device at the start of measurement. FIG. 4 is a vertical cross-sectional view of a tip portion when injection filling is started. [Description of Signs] 1 Injection cylinder 2 Plasticizing cylinder 3 Resin path 4 Nozzle 5 Injection plunger 6 Plunger tip surface 7 Cylinder tip surface 7a Cylinder tip surface 8 on opposite side Injection port 9 Inflow port 11 Cushion 12 Resin pool
Claims (1)
と、可塑化スクリュを内装した可塑化シリンダとを、両
シリンダの先端部間に設けた樹脂路により連通し、その
樹脂路の流入口を円錐形のプランジャ先端面と適合する
シリンダ先端内面に開設したプリプラ式射出装置におい
て、 上記シリンダ先端内面の射出口をシリンダ中心から上記
流入口の対面側にずらせ、その射出口まで対面側のシリ
ンダ先端面をプランジャ先端面より緩斜面に形成して、
対向面側のシリンダ先端面とプランジャ先端面との間に
射出口が臨む樹脂溜りを形成してなることを特徴とする
プリプラ式射出装置。Claims: 1. An injection cylinder containing an injection plunger and a plasticizing cylinder containing a plasticizing screw are communicated by a resin path provided between the tip portions of both cylinders. The injection port of the cylinder tip inner surface is shifted from the center of the cylinder to the opposite side of the inflow port, and the injection port of the cylinder is located on the inner surface of the cylinder tip that is adapted to the tip surface of the conical plunger. The cylinder end surface on the side is formed on a gentler slope than the plunger end surface,
A pre-plastic injection apparatus characterized in that a resin reservoir in which an injection port faces is formed between a tip end surface of a cylinder on the opposite surface side and a tip end surface of a plunger.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001231874A JP3582828B2 (en) | 2001-07-31 | 2001-07-31 | Pre-plastic injection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001231874A JP3582828B2 (en) | 2001-07-31 | 2001-07-31 | Pre-plastic injection device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2003039514A true JP2003039514A (en) | 2003-02-13 |
| JP3582828B2 JP3582828B2 (en) | 2004-10-27 |
Family
ID=19063871
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2001231874A Expired - Fee Related JP3582828B2 (en) | 2001-07-31 | 2001-07-31 | Pre-plastic injection device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3582828B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1595680A1 (en) * | 2002-11-26 | 2005-11-16 | Sanjo Seiki Co., Ltd | Injection molding machine |
-
2001
- 2001-07-31 JP JP2001231874A patent/JP3582828B2/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1595680A1 (en) * | 2002-11-26 | 2005-11-16 | Sanjo Seiki Co., Ltd | Injection molding machine |
| JPWO2004048069A1 (en) * | 2002-11-26 | 2006-03-23 | 俊道 西澤 | Injection molding machine |
| EP1595680A4 (en) * | 2002-11-26 | 2008-06-11 | Sanjo Seiki Co Ltd | Injection molding machine |
| JP4488900B2 (en) * | 2002-11-26 | 2010-06-23 | 俊道 西澤 | Injection molding machine |
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| JP3582828B2 (en) | 2004-10-27 |
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