JP3173359B2 - Operation method for screw prepra injection device - Google Patents
Operation method for screw prepra injection deviceInfo
- Publication number
- JP3173359B2 JP3173359B2 JP03580696A JP3580696A JP3173359B2 JP 3173359 B2 JP3173359 B2 JP 3173359B2 JP 03580696 A JP03580696 A JP 03580696A JP 3580696 A JP3580696 A JP 3580696A JP 3173359 B2 JP3173359 B2 JP 3173359B2
- Authority
- JP
- Japan
- Prior art keywords
- screw
- resin
- injection
- cylinder
- plasticizing
- 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
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
-
- 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
- B29C2045/548—Reciprocating plasticising screws
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
Description
【0001】[0001]
【発明の属する技術分野】この発明は、合成樹脂の射出
成形に用いるスクリュプリプラ式射出装置における操作
方法に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for operating a screw prepeller type injection apparatus used for injection molding of a synthetic resin.
【0002】[0002]
【従来の技術】一般的なスクリュプリプラ式射出装置
は、プランジャ内装の射出シリンダにスクリュ内装の可
塑化シリンダを並設するとともに、可塑化シリンダの先
端と射出シリンダの先端部とを樹脂路により接続して、
可塑化シリンダで溶融・混練(以下可塑化と称する)し
た樹脂を射出シリンダの前部に充填計量してのち、プラ
ンジャの前進により射出を行う構成からなる。2. Description of the Related Art A general screw pre-plaster type injection device has a plasticizing cylinder mounted inside a screw in parallel with an injection cylinder mounted inside a plunger, and a leading end of the plasticizing cylinder and a leading end of the injection cylinder are connected by a resin path. do it,
After the resin melted and kneaded (hereinafter referred to as plasticization) in the plasticizing cylinder is filled and measured in the front portion of the injection cylinder, the injection is performed by advancing the plunger.
【0003】[0003]
【発明が解決しようとする課題】このようなスクリュプ
リプラ式射出装置は、定位置にて回転するスクリュによ
り樹脂の可塑化が行われるため、回転しつつ後退するス
クリュで可塑化を行うインラインスクリュ式射出装置に
比べて可塑化を均一に行い得るとされているが、必ずし
も均一に行われるというものでもなく、スクリュデザイ
ン、材料の状態・特性等によっては可塑化が不均一とな
りやすいばかりか、温度むらを生ずることすらある。In such a screw prepra injection apparatus, since the resin is plasticized by a screw rotating at a fixed position, an in-line screw type in which the plasticizing is carried out by a screw which retreats while rotating. It is said that plasticization can be performed uniformly compared to injection equipment, but it is not necessarily performed uniformly, and depending on the screw design, material condition and characteristics, etc., plasticization is likely to be uneven and temperature It may even cause unevenness.
【0004】この温度むらは射出シリンダと可塑化シリ
ンダとを連通する樹脂路を、外周囲にヒータを備えた細
径の樹脂路とし、その樹脂路を強制的に流動させること
により改善することができ、また樹脂路の流動過程で可
塑化状態を均一に改善することも可能であるが、スクリ
ュの最適回転速度は材料樹脂の種類により異なり、使用
する材料樹脂により決定される。[0004] The uneven temperature can be improved by making the resin path connecting the injection cylinder and the plasticizing cylinder a small-diameter resin path provided with a heater on the outer periphery and forcibly flowing the resin path. Although it is possible to improve the plasticized state uniformly in the course of the flow of the resin path, the optimum rotational speed of the screw differs depending on the type of the material resin and is determined by the material resin used.
【0005】したがって、材料樹脂により決定された回
転速度により送り出されて、細径の樹脂路を通過する可
塑化樹脂の速度は、材料樹脂のさらなる可塑化、温度む
らの改善なる観点からは、必ずしも最適な速度とはいえ
ず、そこに採用された材料樹脂の状態を制御するまでに
は至らない。Therefore, the speed of the plasticized resin which is sent out at the rotation speed determined by the material resin and passes through the small-diameter resin path is not necessarily from the viewpoint of further plasticizing the material resin and improving the temperature unevenness. It cannot be said that the speed is optimal, and it is not enough to control the state of the material resin employed therein.
【0006】また細径の樹脂路を通過する可塑化樹脂の
速度は、スクリュの回転速度に比例するので、回転速度
を上げれば必然的に通過速度も上がることになり、この
ため温度安定のためにゆっくり通過させたくとも、スク
リュの回転速度が大なら速くなり、またその逆もありう
るので、回転速度の制御により最適な条件を実現するこ
とはきわめて困難である。The speed of the plasticized resin passing through the small-diameter resin path is proportional to the rotation speed of the screw. Therefore, if the rotation speed is increased, the passage speed is inevitably increased. It is extremely difficult to achieve optimum conditions by controlling the rotation speed because if the screw speed is high, the speed can be increased, and vice versa.
【0007】また定位置で回転するスクリュによる可塑
化では、可塑化した樹脂を連続して射出シリンダ側に吐
出し、その吐出力によりプランジャを後退させて樹脂の
計量を行うことから、少なくともプランジャの前進によ
る射出充填の開始から保圧までの間は、スクリュの回転
を止めて可塑化を停止している。このため射出と可塑化
とを並行させて、成形サイクルの短縮を図ることが困難
な課題をも有する。[0007] In the plasticization by a screw rotating at a fixed position, the plasticized resin is continuously discharged to the injection cylinder side, and the plunger is retracted by the discharge force to measure the resin. During the period from the start of the injection filling by the advance to the holding pressure, the rotation of the screw is stopped to stop the plasticization. Therefore, there is also a problem that it is difficult to shorten the molding cycle by performing the injection and the plasticization in parallel.
【0008】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つて、その目的は、可塑化装置内
のスクリュの回転速度の制御により材料樹脂の可塑化と
可塑化シリンダの前部内への一次的な計量とを行い、ス
クリュの前進速度の制御により最適な速度で可塑化樹脂
を細径の樹脂路を通過させることによって、材料樹脂の
可塑化の向上と、温度むらの解決、さらには成形サイク
ルの短縮を図ることができる新たなスクリュプリプラ式
射出装置における操作方法を提供することにある。The present invention has been conceived in order to solve the above-mentioned conventional problems, and has as its object to control the rotation speed of a screw in a plasticizing apparatus to plasticize a material resin and prevent the plasticization of the resin before the plasticizing cylinder. The primary metering into the section and the control of the screw advance speed allow the plasticized resin to pass through the small-diameter resin path at the optimum speed, thereby improving plasticization of the material resin and solving temperature unevenness. Another object of the present invention is to provide a new operation method in a screw prepeller type injection apparatus capable of shortening a molding cycle.
【0009】[0009]
【課題を解決するための手段】上記目的によるこの発明
は、射出用のプランジャを進退自在に内装した射出シリ
ンダの後部にプランジャ移動装置を備えた射出装置と、
圧縮比1としたL/Dが15以下で、スクリュ溝が一定
深さに形成された圧縮部のないスクリュを、回転かつ進
退自在に内装した可塑化シリンダの後部に、スクリュ移
動装置と回転装置を備えた可塑化装置とを、射出シリン
ダ先端部のプランジャ前進限に当たる部分の流入路と、
可塑化シリンダ先端の流出路とにわたり設けた細径で外
周に温調手段を有する開閉バルブ付き樹脂路により連通
し、その開閉バルブを、プランジャが設定位置に後退す
ると閉作動して、スクリュ回転による可塑化及び後退移
動による計量を射出充填作業と並行に行えるようにする
一方、可塑化停止時に開作動して、スクリュ回転と後退
移動とにより可塑化してシリンダ先端部内に蓄積した計
量樹脂の全量を、回転停止後のスクリュ前進により上記
樹脂路から射出シリンダのプランジャ前部内に充填し、
その樹脂路を通過する可塑化樹脂の速度を、上記スクリ
ュ移動装置によるスクリュの前進速度の制御により任意
に可変してなる、というものである。また上記射出装置
のプランジャ移動装置と上記可塑化装置のスクリュ移動
装置を油圧シリンダとして、上記スクリュの前進速度を
油圧シリンダの圧油の流量制御により任意に変更可能と
なし、上記可塑化装置のスクリュ回転装置は電動のモー
タからなる、というものでもある。SUMMARY OF THE INVENTION According to the present invention, there is provided an injection apparatus having a plunger moving device at a rear portion of an injection cylinder in which an injection plunger is retractably mounted.
A screw moving device and a rotating device are provided at the rear of a plasticizing cylinder in which an L / D having a compression ratio of 1 and an L / D of 15 or less and a screw groove having a fixed depth and having no compression portion are rotatably and reciprocally mounted. And an inflow path of a part corresponding to a plunger advancement limit at the tip of the injection cylinder,
It communicates with a resin path with an open / close valve having a temperature control means on the outer circumference with a small diameter provided over the outflow path at the tip of the plasticizing cylinder, and the open / close valve is closed when the plunger retreats to the set position, and the screw is rotated. While the plasticization and retreating can be performed in parallel with the injection filling operation, the plasticizer is opened when the plasticization is stopped, and the entire amount of the resin measured and plasticized by the screw rotation and retreating and accumulated in the tip of the cylinder is released. Filling the plunger front part of the injection cylinder from the resin path by the screw advance after rotation stop,
The speed of the plasticized resin passing through the resin path is arbitrarily changed by controlling the forward speed of the screw by the screw moving device. Further, the plunger moving device of the injection device and the screw moving device of the plasticizing device are hydraulic cylinders, and the forward speed of the screw can be arbitrarily changed by controlling the flow rate of the hydraulic oil of the hydraulic cylinder. The rotating device may be an electric motor.
【0010】上記構成では、可塑化用のスクリュの回転
後退により樹脂の計量が行えるので、細径の樹脂路の遮
断により射出充填中でも材料樹脂の可塑化と計量とを行
うことができ、またスクリュの前進移動による押圧力に
より計量樹脂を強制的に樹脂路に圧入するので、射出シ
リンダへの樹脂の圧入及び充填計量が短時間で済む。In the above configuration, the resin can be measured by retreating the rotation of the plasticizing screw, so that the plasticization and the measurement of the material resin can be performed even during injection filling by cutting off the small-diameter resin path. Since the resin to be measured is forcibly pressed into the resin path by the pressing force due to the forward movement of the resin, the press-fitting of the resin into the injection cylinder and the filling and measuring can be completed in a short time.
【0011】また細径の樹脂路を通過する可塑化樹脂の
速度を、スクリュの前進速度の制御により任意に可変可
能となし、スクリュも圧縮比1としたL/Dが15以下
で、スクリュ溝が一定深さに形成された圧縮部のないス
クリュを採用したことから、圧縮時のせん断力及び摩擦
力による発熱を抑制でき、また過熱による樹脂の変色を
も防止することができる。The speed of the plasticized resin passing through the small-diameter resin path can be arbitrarily varied by controlling the forward speed of the screw. The screw has a compression ratio of 1 and the L / D is 15 or less. Since a screw having no compression portion formed at a constant depth is employed, heat generation due to shearing force and frictional force during compression can be suppressed, and discoloration of the resin due to overheating can be prevented.
【0012】[0012]
【発明の実施の形態】図中1は射出装置、2は可塑化装
置で、この可塑化装置2は可塑化シリンダ20の先端部
21を射出シリンダ10の先端部11より後方に位置さ
せて、射出装置1の上に並設してある。また両装置は先
端部11,21にわたり斜めに設けた細径の樹脂路3に
より連通している。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In the drawings, reference numeral 1 denotes an injection device, and 2 denotes a plasticizing device. The plasticizing device 2 has a distal end portion 21 of a plasticizing cylinder 20 located behind a distal end portion 11 of an injection cylinder 10. It is juxtaposed on the injection device 1. The two devices are connected to each other by a small-diameter resin path 3 provided obliquely over the distal ends 11 and 21.
【0013】上記射出装置1は射出用のプランジャ12
を進退自在に内装し、かつ先端にノズル部材13を長く
延設した上記射出シリンダ10と、その射出シリンダ1
0の後端に連設してピストン14を上記プランジャ12
に連結した射出用の油圧シリンダ15とから構成され、
上記ノズル部材13の射出路にはロータリー式の開閉バ
ルブ16が設けてある。The injection device 1 includes an injection plunger 12.
The above-mentioned injection cylinder 10 in which a nozzle member 13 is extended long at the tip, and the injection cylinder 1
0, and the piston 14 is connected to the plunger 12
And an injection hydraulic cylinder 15 connected to the
A rotary opening / closing valve 16 is provided in the injection path of the nozzle member 13.
【0014】上記射出シリンダ10は、先端部11のプ
ランジャ前進限に当たる上部に、上記樹脂路3の流入路
を有し、その流入路は樹脂路3と同径でロータリー式の
開閉バルブ17が設けてある。また射出シリンダ10の
プランジャストロークよりも後方の壁部には樹脂抜き穴
18が設けてあり、その樹脂抜き穴18の後のシリンダ
周囲までノズル先端部からバンドヒーター19を設け
て、ヒーターゾーンを長く設定してある。これによりプ
ランジャ周囲に侵入した樹脂は、プランジャ12の後退
時ごとに後方へ送られて、上記樹脂抜き穴18から外部
に排出される。The injection cylinder 10 has an inflow path of the resin path 3 at an upper portion corresponding to a plunger advance limit of the tip section 11, and the inflow path is provided with a rotary opening / closing valve 17 having the same diameter as the resin path 3. It is. Further, a resin vent hole 18 is provided in a wall portion behind the plunger stroke of the injection cylinder 10, and a band heater 19 is provided from the nozzle tip portion to the periphery of the cylinder after the resin vent hole 18 to extend the heater zone. It has been set. As a result, the resin that has entered the periphery of the plunger is sent rearward each time the plunger 12 retreats, and is discharged to the outside through the resin removal hole 18.
【0015】上記可塑化装置2は、可塑化シリンダ20
の内部に可塑化用のスクリュ22を回転かつ進退自在に
備えている。このスクリュ22のスクリュ溝の深さは一
定で、圧縮部を有せず、また圧縮比1としたL/Dが1
5以下のものからなり、その後端は可塑化シリンダ20
の後部の保持部材23に設けた油圧シリンダ24のピス
トン25に連結されている。The plasticizing device 2 includes a plasticizing cylinder 20
, A plasticizing screw 22 is provided so as to rotate and move forward and backward. The depth of the screw groove of this screw 22 is constant, has no compression portion, and L / D at a compression ratio of 1 is 1
5 or less, the rear end of which is a plasticizing cylinder 20
Is connected to a piston 25 of a hydraulic cylinder 24 provided on a rear holding member 23.
【0016】上記油圧シリンダ24の後端にはスクリュ
回転用の油圧または電動のモータ26が取り付けてあ
り、このモータ26から油圧シリンダ内に突出した回転
駆動軸27と上記ピストン25とを、スプラインなどに
より軸方向に可動自在に嵌合して、上記スクリュ22を
ピストン25を介して回転することができるようにして
ある。A hydraulic or electric motor 26 for screw rotation is attached to the rear end of the hydraulic cylinder 24. A rotary drive shaft 27 projecting from the motor 26 into the hydraulic cylinder and the piston 25 are connected to a spline or the like. Thus, the screw 22 is movably fitted in the axial direction so that the screw 22 can be rotated via the piston 25.
【0017】上記可塑化シリンダ20の外周囲にはバン
ドヒーター28が取付けてあり、また保持部材23と嵌
合した可塑化シリンダ20の後端部の供給穴にはホッパ
ー29が取付けてある。A band heater 28 is attached to the outer periphery of the plasticizing cylinder 20, and a hopper 29 is attached to a supply hole at the rear end of the plasticizing cylinder 20 fitted to the holding member 23.
【0018】上記細径の樹脂路3は内径が5〜10mm程
の金属細管によるもので、外周囲にバンドヒーター31
などによる温調手段を備えている。また樹脂路3は射出
シリンダ10の先端部11と可塑化シリンダ20の先端
部21とにわたり40°〜50°の傾斜角度により先方
に鋭角に斜めに設けられている。The resin path 3 having a small diameter is made of a thin metal tube having an inner diameter of about 5 to 10 mm.
Temperature control means. Further, the resin path 3 is provided at an acute angle obliquely forward with an inclination angle of 40 ° to 50 ° over the distal end portion 11 of the injection cylinder 10 and the distal end portion 21 of the plasticizing cylinder 20.
【0019】上記射出装置1と可塑化装置2は、射出装
置1の上記油圧シリンダ15の上に設けた支持台30
に、可塑化装置2の上記保持部材23を載置固定して、
上下2段のスクリュプリプラ式射出装置に構成され、ま
た油圧シリンダ15の下側に設けたベースブロック4
を、機台5の上に前後方向に摺動自在に設置して、該機
台5に載置してある。The injection device 1 and the plasticizing device 2 are connected to a support 30 provided on the hydraulic cylinder 15 of the injection device 1.
Then, the holding member 23 of the plasticizing device 2 is placed and fixed,
A base block 4 which is constituted by an upper and lower two-stage screw pre-plastic injection device and is provided below the hydraulic cylinder 15
Are slidably mounted in the front-rear direction on the machine base 5 and mounted on the machine base 5.
【0020】上記スクリュプリプラ式射出装置の進退移
動は、ベースブロック4の後端とベースプレート5の上
面に突設した受部材51とにわたる油圧シリンダ7とピ
ストン7aとによるもので、該ピストン7aの伸長ごと
に射出装置1と可塑化装置2とが共に前進移動して射出
装置1のノズル先端が、図では省略したが、金型のスプ
ルなどにノズルタッチして樹脂の射出充填を行い、また
後退移動によりスプルなどから離れて、材料パージまた
は装置のメンテナンスなどが行えるようになっている。The forward / backward movement of the screw prepeller type injection device is caused by the hydraulic cylinder 7 and the piston 7a extending between the rear end of the base block 4 and the receiving member 51 protruding from the upper surface of the base plate 5, and the piston 7a extends. In each case, the injection device 1 and the plasticizing device 2 move forward, and the tip of the nozzle of the injection device 1 is not shown in the drawing. The movement moves away from the sprue or the like so that material purging or maintenance of the apparatus can be performed.
【0021】次に射出動作について説明すると、まず上
記樹脂路3を開閉バルブ17により閉鎖し、射出シリン
ダ内のプランジャ12に所定の背圧力を上記油圧シリン
ダ15により加えておく。Next, the injection operation will be described. First, the resin path 3 is closed by an opening / closing valve 17, and a predetermined back pressure is applied to the plunger 12 in the injection cylinder by the hydraulic cylinder 15.
【0022】このような準備の後、スクリュ22を上記
モータ26により回転しつつペレットの材料樹脂をホッ
パー29から可塑化シリンダ20に送り込むと、材料樹
脂は一定深さのスクリュ溝によりシリンダ前部へと移送
される。この移送中にバンドヒーター28によるシリン
ダ側からの加熱と、スクリュ22の回転による或る程度
のせん断発熱とにより溶融・混練されながら順次前方へ
と圧送される。スクリュ22は可塑化により生じた樹脂
圧により後退してゆくが可塑化は継続される。このスク
リュ22の後退に伴ってスクリュ前部のシリンダ内に可
塑化された樹脂が順次蓄積されれる。この蓄積量はスク
リュの後退量によって異なる。After such preparation, the resin material of the pellets is fed from the hopper 29 to the plasticizing cylinder 20 while the screw 22 is rotated by the motor 26, and the resin material is transferred to the front portion of the cylinder by a screw groove having a constant depth. Is transferred. During this transfer, heating is performed from the cylinder side by the band heater 28 and a certain amount of shear heat generated by the rotation of the screw 22 is sequentially fed forward while being melted and kneaded. The screw 22 retreats due to the resin pressure generated by the plasticization, but the plasticization is continued. As the screw 22 retreats, plasticized resin is sequentially accumulated in the cylinder at the front of the screw. The amount of accumulation differs depending on the amount of screw retreat.
【0023】その蓄積量が予め設定された量に達する
と、スクリュ22の回転が停止されて材料樹脂の可塑化
も停止し、スクリュは後退位置にて止まる。これにより
スクリュ前部のシリンダ内に設定量の樹脂が一次的に計
量される。その停止とほぼ同時に上記開閉バルブ17が
開作動して上記樹脂路3が射出シリンダ側と連通するよ
うになる。そこで上記油圧シリンダ24によりスクリュ
22を前進移動すると、計量後の可塑化樹脂は強制的に
細径の樹脂路3に押し込めらる。このスクリュ22の前
進速度は、油圧シリンダ24に供給される圧油の流量制
御により任意に変更することができる。When the accumulated amount reaches a predetermined amount, the rotation of the screw 22 is stopped, the plasticization of the material resin is also stopped, and the screw stops at the retracted position. As a result, a set amount of resin is primarily measured in the cylinder at the front of the screw. Almost simultaneously with the stop, the opening / closing valve 17 is opened, and the resin path 3 communicates with the injection cylinder side. Therefore, when the screw 22 is moved forward by the hydraulic cylinder 24, the plasticized resin after measurement is forcibly pushed into the resin path 3 having a small diameter. The forward speed of the screw 22 can be arbitrarily changed by controlling the flow rate of the pressure oil supplied to the hydraulic cylinder 24.
【0024】射出シリンダ側ではプランジャ12に所定
の背圧力が加えられているだけで、樹脂の圧入を阻止す
るものはないから、スクリュ22の前部に一次計量され
た可塑化樹脂の全量が、スクリュ22の押圧力により上
記樹脂路3を通過し、プランジャ12を後退移動させな
がら射出シリンダ10の前部内に充填される。この際、
上記樹脂路3では、細管内を通過する間の流動抵抗と外
部からの加熱とによって、可塑化樹脂はさらに一層可塑
化されながら射出シリンダ10の前部内へと流動してゆ
く。On the side of the injection cylinder, only a predetermined back pressure is applied to the plunger 12 and there is nothing to prevent the injection of the resin, so that the total amount of the plasticized resin primarily measured at the front of the screw 22 is The resin is passed through the resin path 3 by the pressing force of the screw 22, and is filled in the front portion of the injection cylinder 10 while the plunger 12 is moved backward. On this occasion,
In the resin path 3, the plasticized resin flows into the front portion of the injection cylinder 10 while being further plasticized by the flow resistance during the passage through the narrow tube and the external heating.
【0025】上記プランジャ12の後退により可塑化樹
脂は再び射出シリンダ10の前部内に蓄積され、射出量
が正確に計量されることになる。そしてプランジャ12
が設定位置まで後退すると、開閉バルブ17が閉作動し
て上記樹脂路3が閉じ、射出装置側ではプランジャ12
の前進移動による可塑化樹脂の射出工程に切換わる。ま
た可塑化装置側ではスクリュ22が回転して再び材料樹
脂の可塑化が行われるようになる。The retraction of the plunger 12 causes the plasticized resin to accumulate again in the front portion of the injection cylinder 10, so that the injection amount is accurately measured. And plunger 12
Is retracted to the set position, the opening / closing valve 17 is closed to close the resin path 3, and the plunger 12
The process is switched to the injection process of the plasticized resin by the forward movement of. On the plasticizing device side, the screw 22 rotates and plasticization of the material resin is performed again.
【0026】上記樹脂路3を閉鎖した状態でプランジャ
12が上記油圧シリンダ15により前進移動すると、射
出シリンダ内に計量された可塑化樹脂の全量がノズル先
端から金型(図示せず)に射出充填される。この充填が
完了した後もプランジャ12には油圧シリンダ15によ
り所定の圧力が加えられて樹脂の保圧が行われる。この
保圧が完了した時点、場合によっては完了よりある程度
前に、上記開閉バルブ16を閉作動して射出通路を遮断
し、工程は冷却に移行する。When the plunger 12 is moved forward by the hydraulic cylinder 15 with the resin path 3 closed, the entire amount of the plasticized resin measured in the injection cylinder is injected and filled into a mold (not shown) from the nozzle tip. Is done. After the filling is completed, a predetermined pressure is applied to the plunger 12 by the hydraulic cylinder 15 to maintain the pressure of the resin. At the time when the pressure holding is completed, or in some cases, before the completion, the opening / closing valve 16 is closed to shut off the injection passage, and the process shifts to cooling.
【0027】上記射出通路の遮断後に細径の樹脂路3の
開閉バルブ17を開作動すると、樹脂路3の開通により
計量された可塑化樹脂の可塑化装置2側から射出装置1
側への充填が可能となる。この充填時にはスクリュ22
の回転が既に停止されているので、充填はスクリュ回転
に関係なくスクリュ22の前進移動をもって行えるよう
になる。このため可塑化樹脂が細径の樹脂路3を通過す
るプロセスは、スクリュの前進速度の制御により任意に
制御できることになり、この結果、可塑化樹脂の状態を
更に一層良好となすことができる。When the opening / closing valve 17 of the small-diameter resin passage 3 is opened after the injection passage is shut off, the injection device 1 is moved from the plasticizing device 2 side of the plasticized resin measured by the opening of the resin passage 3.
Side filling is possible. When filling, screw 22
Since the rotation of the screw 22 is already stopped, the filling can be performed by the forward movement of the screw 22 regardless of the rotation of the screw. For this reason, the process in which the plasticized resin passes through the resin path 3 having a small diameter can be arbitrarily controlled by controlling the forward speed of the screw. As a result, the state of the plasticized resin can be further improved.
【0028】また可塑化装置2では射出装置1による射
出充填作業に並行して材料樹脂の可塑化作業が行われて
いることから、射出充填・保圧の完了後、直ちに射出シ
リンダ前部への計量樹脂の圧入充填が行え、また予め可
塑化シリンダ側で計量した樹脂の再計量を射出シリンダ
側でも行えるので、計量精度が向上し、時間短縮による
サイクルアップも可能となる。In the plasticizing device 2, since the plasticizing operation of the material resin is performed in parallel with the injection filling operation by the injection device 1, immediately after the completion of the injection filling and the pressure holding, the plasticizing operation is performed to the front of the injection cylinder. Since the resin to be measured can be injected and filled, and the resin previously measured on the plasticizing cylinder side can be re-measured on the injection cylinder side, the measuring accuracy can be improved and the cycle can be shortened and the cycle can be increased.
【図1】 この発明に係るスクリュプリプラ式射出装置
の1実施形態の縦断側面図である。FIG. 1 is a longitudinal sectional side view of an embodiment of a screw prepra type injection device according to the present invention.
1 射出装置 2 可塑化装置 3 細径の樹脂路 10 射出シリンダ 12 射出用のプランジャ 13 ノズル部材 15 射出用の油圧シリンダ 16 射出路の開閉バルブ 17 樹脂路の開閉バルブ 20 可塑化シリンダ 22 可塑化用のスクリュ 24 スクリュ前後進用の油圧シリンダ 26 スクリュ回転用のモータ REFERENCE SIGNS LIST 1 injection device 2 plasticizing device 3 small-diameter resin path 10 injection cylinder 12 injection plunger 13 nozzle member 15 injection hydraulic cylinder 16 injection path opening / closing valve 17 resin path opening / closing valve 20 plasticizing cylinder 22 plasticizing Screw 24 Hydraulic cylinder for screw forward and backward movement 26 Motor for screw rotation
───────────────────────────────────────────────────── フロントページの続き (58)調査した分野(Int.Cl.7,DB名) B29C 45/00 - 45/84 ──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int. Cl. 7 , DB name) B29C 45/00-45/84
Claims (3)
た射出シリンダの後部にプランジャ移動装置を備えた射
出装置と、 圧縮比1としたL/Dが15以下で、スクリュ溝が一定
深さに形成された圧縮部のないスクリュを、回転かつ進
退自在に内装した可塑化シリンダの後部に、スクリュ移
動装置と回転装置を備えた可塑化装置とを、 射出シリンダ先端部のプランジャ前進限に当たる部分の
流入路と、可塑化シリンダ先端の流出路とにわたり設け
た細径で外周に温調手段を有する開閉バルブ付き樹脂路
により連通し、 その開閉バルブを、プランジャが設定位置に後退すると
閉作動して、スクリュ回転による可塑化及び後退移動に
よる計量を射出充填作業と並行に行えるようにする一
方、 可塑化停止時に開作動して、スクリュ回転と後退移動と
により可塑化してシリンダ先端部内に蓄積した計量樹脂
の全量を、回転停止後のスクリュ前進により上記樹脂路
から射出シリンダのプランジャ前部内に充填し、 その樹脂路を通過する可塑化樹脂の速度を、上記スクリ
ュ移動装置によるスクリュの前進速度の制御により任意
に可変してなることを特徴とするスクリュプリプラ式射
出装置における操作方法。1. An injection device having a plunger moving device at a rear portion of an injection cylinder in which an injection plunger is housed so that the plunger can move forward and backward. At the rear of the plasticizing cylinder, in which the formed screw without compression part is rotatably and retractably housed, a plasticizing device with a screw moving device and a rotating device is attached at the part of the tip of the injection cylinder that corresponds to the plunger advance limit. The inflow path is communicated with a resin path with an on-off valve provided with a temperature control means on the outer circumference, which is provided with a small diameter and is provided between the inflow path and the outflow path at the end of the plasticizing cylinder. , While plasticizing by screw rotation and weighing by retreating can be performed in parallel with injection filling work, while opening when plasticization stops, screw rotation and retreating The entire amount of metered resin that has been plasticized and accumulated in the tip of the cylinder is filled into the front of the plunger of the injection cylinder from the resin path by the screw advancement after rotation stop, and the speed of the plasticized resin passing through the resin path is An operation method in a screw prepeller-type injection device, wherein the operation is arbitrarily changed by controlling a screw advancing speed by the screw moving device.
記可塑化装置のスクリュ移動装置を油圧シリンダとし、
上記スクリュの前進速度を油圧シリンダの圧油の流量制
御により任意に変更可能としてなることを特徴とする請
求項1記載のスクリュプリプラ式射出装置における樹脂
の操作方法。2. A hydraulic cylinder as a plunger moving device of the injection device and a screw moving device of the plasticizing device,
2. The resin operating method according to claim 1, wherein the forward speed of the screw can be arbitrarily changed by controlling the flow rate of pressure oil of a hydraulic cylinder.
動のモータからなることを特徴とする請求項1記載のス
クリュプリプラ式射出装置における操作方法。3. The operating method according to claim 1, wherein the screw rotating device of the plasticizing device comprises an electric motor.
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP03580696A JP3173359B2 (en) | 1996-01-31 | 1996-01-31 | Operation method for screw prepra injection device |
DE1997103628 DE19703628A1 (en) | 1996-01-31 | 1997-01-31 | Pre-plasticising and injection unit assembly achieving faster cycle time |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP03580696A JP3173359B2 (en) | 1996-01-31 | 1996-01-31 | Operation method for screw prepra injection device |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH09207180A JPH09207180A (en) | 1997-08-12 |
JP3173359B2 true JP3173359B2 (en) | 2001-06-04 |
Family
ID=12452180
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP03580696A Expired - Fee Related JP3173359B2 (en) | 1996-01-31 | 1996-01-31 | Operation method for screw prepra injection device |
Country Status (2)
Country | Link |
---|---|
JP (1) | JP3173359B2 (en) |
DE (1) | DE19703628A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN105014885A (en) * | 2015-08-20 | 2015-11-04 | 泰瑞机器股份有限公司 | Runner-free switching valve internal recycle material removing type screw plunger plastic injection molding machine |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19819833C2 (en) | 1998-05-04 | 2002-01-17 | Battenfeld Gmbh | Method and device for injecting plastic material |
JP3620380B2 (en) | 1998-12-25 | 2005-02-16 | 株式会社村田製作所 | Injection molding machine for thermoplastic resin |
DE10144280A1 (en) * | 2001-09-08 | 2003-03-27 | Sig Corpoplast Gmbh & Co Kg | Injection molding process, for production of polyethylene terephthalate bottle preforms, comprises simultaneous injection by screw and follow-up pressure unit |
DE102005050117B4 (en) * | 2005-10-18 | 2009-08-20 | Klöckner Desma Elastomertechnik GmbH | Plasticizing and injection unit |
JP5802689B2 (en) * | 2013-01-16 | 2015-10-28 | 日精樹脂工業株式会社 | Two-component injection machine |
CN111907020A (en) * | 2020-07-27 | 2020-11-10 | 湖北帮友科技有限公司 | Injection molding machine micro-injection device capable of realizing high-speed and high-precision injection |
-
1996
- 1996-01-31 JP JP03580696A patent/JP3173359B2/en not_active Expired - Fee Related
-
1997
- 1997-01-31 DE DE1997103628 patent/DE19703628A1/en not_active Ceased
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN105014885A (en) * | 2015-08-20 | 2015-11-04 | 泰瑞机器股份有限公司 | Runner-free switching valve internal recycle material removing type screw plunger plastic injection molding machine |
Also Published As
Publication number | Publication date |
---|---|
DE19703628A1 (en) | 1997-10-30 |
JPH09207180A (en) | 1997-08-12 |
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