JPS6358690B2 - - Google Patents

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Publication number
JPS6358690B2
JPS6358690B2 JP57059151A JP5915182A JPS6358690B2 JP S6358690 B2 JPS6358690 B2 JP S6358690B2 JP 57059151 A JP57059151 A JP 57059151A JP 5915182 A JP5915182 A JP 5915182A JP S6358690 B2 JPS6358690 B2 JP S6358690B2
Authority
JP
Japan
Prior art keywords
vent
resin
screw
keyed
cylinder
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
Application number
JP57059151A
Other languages
Japanese (ja)
Other versions
JPS58175641A (en
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
Application filed filed Critical
Priority to JP57059151A priority Critical patent/JPS58175641A/en
Publication of JPS58175641A publication Critical patent/JPS58175641A/en
Publication of JPS6358690B2 publication Critical patent/JPS6358690B2/ja
Granted legal-status Critical Current

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
    • B29C45/58—Details
    • B29C45/63—Venting or degassing means
    • 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
    • B29C48/685—Barrels or cylinders characterised by their inner surfaces, e.g. having grooves, projections or threads
    • B29C48/686—Barrels or cylinders characterised by their inner surfaces, e.g. having grooves, projections or threads having grooves or cavities
    • 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
    • B29C48/92—Measuring, controlling or regulating
    • 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
    • B29C2948/00—Indexing scheme relating to extrusion moulding
    • B29C2948/92—Measuring, controlling or regulating
    • B29C2948/92009—Measured parameter
    • B29C2948/92019—Pressure
    • 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
    • B29C2948/00—Indexing scheme relating to extrusion moulding
    • B29C2948/92—Measuring, controlling or regulating
    • B29C2948/92323—Location or phase of measurement
    • B29C2948/92361—Extrusion unit
    • B29C2948/9238—Feeding, melting, plasticising or pumping zones, e.g. the melt itself
    • B29C2948/924—Barrel or housing
    • 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
    • B29C2948/00—Indexing scheme relating to extrusion moulding
    • B29C2948/92—Measuring, controlling or regulating
    • B29C2948/92504—Controlled parameter
    • B29C2948/92514—Pressure
    • 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
    • B29C2948/00—Indexing scheme relating to extrusion moulding
    • B29C2948/92—Measuring, controlling or regulating
    • B29C2948/92504—Controlled parameter
    • B29C2948/9258—Velocity
    • B29C2948/9259—Angular velocity
    • 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
    • B29C2948/00—Indexing scheme relating to extrusion moulding
    • B29C2948/92—Measuring, controlling or regulating
    • B29C2948/92504—Controlled parameter
    • B29C2948/92704—Temperature
    • 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
    • B29C2948/00—Indexing scheme relating to extrusion moulding
    • B29C2948/92—Measuring, controlling or regulating
    • B29C2948/92819—Location or phase of control
    • B29C2948/92857—Extrusion unit
    • B29C2948/92876—Feeding, melting, plasticising or pumping zones, e.g. the melt itself
    • B29C2948/92885—Screw or gear
    • 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
    • B29C2948/00—Indexing scheme relating to extrusion moulding
    • B29C2948/92—Measuring, controlling or regulating
    • B29C2948/92819—Location or phase of control
    • B29C2948/92857—Extrusion unit
    • B29C2948/92876—Feeding, melting, plasticising or pumping zones, e.g. the melt itself
    • B29C2948/92895—Barrel or housing
    • 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
    • B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)

Description

【発明の詳細な説明】[Detailed description of the invention]

本発明はベント型射出成形機、ベント型押出成
形機等に応用できるベント成形方法に関するもの
である。 ここでは従来のベント射出成形機を例にとり説
明するが、ベント押出成形機も基本的な概念はま
つたく同様であるのでその説明は省略する。第１
図は従来のベント型射出成形機を示す。図におい
てベントスクリユ１はスクリユシリンダ２の中に
摺動、かつ回転自在に組込まれており、同ベント
スクリユ１は、リングバルブ３により第１ステー
ジａ、第２ステージｂに分割されている。 ホツパ４から供給された原料樹脂は、ベントス
クリユ１による機械的なエネルギーと、ヒータに
よる熱的エネルギーにより第１ステージａの中を
移送されながら溶融が促進される。そして途中ベ
ント孔５で大気圧または図示していない真空ポン
プにより真空引を行なうことにより、樹脂中に含
まれる水分、モノマー等を気化させ除去する。脱
気された溶融樹脂は、さらに前方に移送され、射
出時の逆流を防止するチエツクリング６を通過
し、スクリユ先端ｃに貯溜される。 これらの作用により、ベント型射出成形機はベ
ント孔５を持たない射出成形機では得られない表
面光沢度の良い製品ができ、また樹脂の予備乾燥
が省略できるなどの長所をもつが、一方ベントア
ツプ現象（ベント孔５から溶融樹脂が溢流して運
転不能となる）や色替性不良など操作性面での欠
点がある。そこでベントアツプを防止するため、
第１ステージａの可塑化能力Q1と第２ステージ
ｂの可塑化能力Q2の関係をQ2＞Q1となるようベ
ントスクリユ１は設計されている。 ところがベントアツプ現象はベントスクリユ１
と、スクリユシリンダ２の温度の変化しやすい運
転立上り時、または安定運転に入つた場合でも、
外気温や油温変化などの外乱によりしばしば発生
する。ベントアツプが発生すると、オペレータは
スクリユ回転数やシリンダ温度など成形条件をそ
の都度変更し、対応している。したがつてベント
型射出成形機は運転操作が難しいことの他、ベン
トアツプに伴なう製品ロスが多い等の欠点があつ
た。従来も特公昭46―13571号公報において、ベ
ント孔とホツパとの間のシリンダに半月形の弁板
を設けることによりベントアツプ防止を図るよう
にした押出量調整装置が提案されているが、これ
はスクリユ溝内の溶融樹脂の体積を増減するもの
であり、しかも弁板の開閉は手動で行なつてい
た。 本発明は前記従来の欠点を解消するために提案
されたもので、ベントアツプ初期にセンサでこれ
を検知し、この信号をホツパの下部に設置した複
数個のキードスリーブの本数と溝深さを調整する
機構にフイードバツクし、まだ溶融していない固
体樹脂とシリンダ内壁の摩擦係数を増加するため
キードスリーブの夫々のキーを独立して段階的又
は無段階に摺動させるようにして、自動的にベン
トアツプを防止するようにしたもので、ベントア
ツプを検知したとき、キードスリーブの本数また
は溝深さを減少させ、第１ステージの供給能力の
み低下させ、第２ステージで決まる可塑化能力を
低下させることなく、ベントアツプを防止するよ
うにしたベント成形方法を提供せんとするもので
ある。 以下本発明の実施例を図面について説明する
と、第２図は本発明の１実施例のベント成形機を
示し、第２ステージｂのフイードゾーンｄに樹脂
圧力センサ７を設け、設定値および接点出力付の
樹脂圧力変換器８に接続する。樹脂圧力変換器８
とシーケンスコントローラ１３とが接続され、こ
の出力により電磁弁９がコントロールされる。ス
クリユ回転用油圧モータ１０に供給されている圧
力油の一部が、複数個（第２図では説明の便宜上
１個）の電磁弁９に分配される。１１はホツパ下
部のシリンダ２に配設された複数個のキー１２
を、まだ溶融していない固体樹脂とシリンダ２の
内壁の摩擦係数を増加するため夫々摺動させるキ
ードスリーブの油圧シリンダである。 第３図に調整可能なキードスリーブの詳細図を
示すと、油圧シリンダ１１ａ，１１ｂ（図示して
いないが、これらと180゜対称位置にさらに２個配
置する）のピストン１３ａ，１３ｂにキー１２
ａ，１２ｂが連結され、油圧シリンダ、キー、ス
クリユシリンダ２によつて、調整可能なキードス
リーブが構成されている。また油圧シリンダ１１
ａと１１ｂは、それぞれ組合せを多様化するた
め、キー１２ａ，１２ｂのストロークのＳ１とＳ
２、幅のｇ１とｇ２を変える。なお、図中１はベ
ントスクリユ、４はホツパ、５はベント孔であ
る。 次に作用を説明すると、ベントアツプ現象は、
第１ステージａの可塑化（供給）能力Q1が第２
ステージｂの可塑化能力Q2より大のとき発生す
る。特に射出成形機では、スクリユが可塑化時
（第２図でスクリユ先端部ｃに貯溜される樹脂に
よりスクリユが右方向に移動する）と射出時（第
２図ではスクリユが左方向に移動する）と停止を
繰返すので、Q1およびQ2が極めて不安定となる。 本発明では、最終的な第２ステージｂの可塑化
能力Q2の不安定さ（１回ごとの可塑化時間の変
動や、スクリユ後退速度の時間的変動）を肯定し
て、第１ステージａの可塑化（供給）能力Q1を
適応制御させる。第１ステージａの供給能力は、
スクリユデイメンシヨン、成形条件、スクリユシ
リンダ表面粗度、スクリユ表面粗度などで決定さ
れる。 またキードスリーブを組込むことにより、第１
ステージａの供給能力Q1はキードスリーブの溝
本数および深さにある程度比例する。これを応用
し、設定値および接点出力付樹脂圧力変換器８に
予じめベントアツプを予測するための樹脂圧力を
設定する。スクリユ回転中の樹脂圧力レベルが設
定圧力以下であれば、電磁弁ｅが入り、キードス
リーブ能力が最大稼動（キー１２ａ，１２ｂが引
込む）し、第１ステージの可塑化能力Q1が最大
となる。 樹脂圧力レベルが設定圧力を越えると、電磁弁
ｆが入り、キー１２ａ，１２ｂがストロークＳ
１，Ｓ２押込まれ、スクリユシリンダ２は一般の
溝のないシリンダとなり、第１ステージａの可塑
化能力が次第に低下してQ2＞Q1の関係に復元さ
れ、ベントアツプが直前に防止される。このとき
必要以上に可塑化能力Q1が低下すると、可塑化
能力Q2も低下するので、キー１２ａと１２ｂと
を多段制御（まず１２ａのみ作動させ、一定時間
経過しても、まだ樹脂圧力が設定値を越えている
ならばさらに１２ｂを作動させる）すれば、より
最適制御が可能となる。 キードスリーブの調整は、すべてスクリユ回転
中に実施し、スクリユ回転用油圧モータ１０の負
荷圧を油圧シリンダ１１ａ，１１ｂに分配する。
油圧シリンダ１１ａ，１１ｂの作動ストロークＳ
１，Ｓ２は10mm以内であり、頻繁に作動するもの
でもないので、スクリユ回転数にはほとんど影響
しない。 なお、本発明装置の簡易型として、フイードバ
ツクコントロールを実施しないプログラムコント
ロールがある。即ち、運転立上りから定常運転に
至るまで、キードスリーブのキーの溝本数を２〜
３段階に時系列的にプログラムコントロールする
方法も実施できる。またセンサとして樹脂圧力計
７の他、ベント孔５に熱電対またはマイクロスイ
ツチを使用することもできる。なお、センサを変
える場合、樹脂圧力変換器８も変わる。一方電磁
弁９のかわりにサーボバルブを使用し、キー位置
を無段階にコントロールすることも出来る。 実施例 樹脂送り出し量増加率のキードスリーブの体積
変化に対する感度は、ポリスチロール／ポリプロ
ピレンに対し0.7／0.3％／cm3（キー溝幅ｇ＝33
mm、キー溝深さｓ＝４mm、キー溝長さｌ＝145mm
のキー１本当り12.5／5.5％）と効果大であつた。 またキー溝幅に対する感度は、−0.2／−0.4
％／mmで、前記感度より若干小さかつたが、キー
溝幅を小さくする効果は認められた。従つてキー
溝数、幅を設定して深さを制御すれば、樹脂送り
出し量を制御できることが判明した。 以下キードスリーブの体積変化に対する樹脂送
り出し量変化の試験データを第１表に示す。 The present invention relates to a vent molding method that can be applied to a vent-type injection molding machine, a vent-type extrusion molding machine, and the like. Here, a conventional vent injection molding machine will be explained as an example, but since the basic concept of a vent extrusion molding machine is exactly the same, the explanation thereof will be omitted. 1st
The figure shows a conventional vent-type injection molding machine. In the figure, a vent screw 1 is slidably and rotatably incorporated into a screw cylinder 2, and the vent screw 1 is divided by a ring valve 3 into a first stage a and a second stage b. The raw material resin supplied from the hopper 4 is transferred through the first stage a by mechanical energy from the vent screw 1 and thermal energy from the heater, and its melting is promoted. Then, by evacuation at atmospheric pressure or by a vacuum pump (not shown) in the vent hole 5 midway, moisture, monomer, etc. contained in the resin are vaporized and removed. The degassed molten resin is further transferred forward, passes through a check ring 6 that prevents backflow during injection, and is stored at the screw tip c. Due to these effects, vent-type injection molding machines can produce products with good surface gloss that cannot be obtained with injection molding machines that do not have vent holes 5, and have the advantage that pre-drying of the resin can be omitted. There are drawbacks in terms of operability, such as a phenomenon (molten resin overflows from the vent hole 5 and operation becomes impossible) and poor color changing performance. Therefore, in order to prevent vent build-up,
The vent screw 1 is designed so that the relationship between the plasticizing ability Q 1 of the first stage a and the plasticizing ability Q 2 of the second stage b satisfies Q 2 >Q 1 . However, the vent up phenomenon is caused by vent screw 1.
At the start of operation, where the temperature of the screw cylinder 2 is likely to change, or even when stable operation has started,
This often occurs due to external disturbances such as changes in outside temperature or oil temperature. When vent-up occurs, operators respond by changing molding conditions such as screw rotation speed and cylinder temperature. Therefore, vent-type injection molding machines have drawbacks such as being difficult to operate and causing a lot of product loss due to vent-up. Previously, in Japanese Patent Publication No. 13571/1983, an extrusion rate adjusting device was proposed in which a half-moon-shaped valve plate was provided on the cylinder between the vent hole and the hopper to prevent vent build-up. The volume of the molten resin in the screw groove is increased or decreased, and the valve plate is opened and closed manually. The present invention was proposed in order to eliminate the above-mentioned drawbacks of the conventional technology, and detects this with a sensor at the early stage of vent-up, and transmits this signal to the number and groove depth of a plurality of keyed sleeves installed at the bottom of the hopper. Feedback is provided to the adjustment mechanism to increase the coefficient of friction between the unmolten solid resin and the inner wall of the cylinder by sliding each key of the keyed sleeve independently in stages or continuously. This system is designed to prevent vent-up, and when vent-up is detected, the number of keyed sleeves or groove depth is reduced, reducing only the supply capacity of the first stage and reducing the plasticizing capacity determined by the second stage. It is an object of the present invention to provide a method for forming a vent that prevents vent build-up without causing damage. An embodiment of the present invention will be described below with reference to the drawings. Fig. 2 shows a vent molding machine according to an embodiment of the present invention, in which a resin pressure sensor 7 is provided in the feed zone d of the second stage b, and a set value and a contact output are provided. Connect to the resin pressure transducer 8. Resin pressure transducer 8
and a sequence controller 13 are connected, and the solenoid valve 9 is controlled by this output. A portion of the pressure oil supplied to the screw rotation hydraulic motor 10 is distributed to a plurality of (one in FIG. 2 for convenience of explanation) electromagnetic valves 9. Reference numeral 11 indicates a plurality of keys 12 arranged in the cylinder 2 at the bottom of the hopper.
This is a hydraulic cylinder with a keyed sleeve that slides between the unmolten solid resin and the inner wall of the cylinder 2 to increase the friction coefficient, respectively. FIG. 3 shows a detailed view of the adjustable keyed sleeve. The key 12 is attached to the pistons 13a, 13b of the hydraulic cylinders 11a, 11b (not shown, but two more are arranged 180 degrees symmetrically with these cylinders).
a and 12b are connected, and the hydraulic cylinder, key, and screw cylinder 2 constitute an adjustable keyed sleeve. Also, the hydraulic cylinder 11
a and 11b are the strokes S1 and S of the keys 12a and 12b, respectively, in order to diversify the combinations.
2. Change the width g1 and g2. In the figure, 1 is a vent screw, 4 is a hopper, and 5 is a vent hole. Next, to explain the effect, the vent-up phenomenon is
The plasticization (supply) capacity Q 1 of the first stage a is the second
This occurs when the plasticizing capacity of stage b is greater than Q2 . In particular, in an injection molding machine, the screw moves during plasticization (in Figure 2, the screw moves to the right due to the resin stored in the tip c of the screw) and during injection (in Figure 2, the screw moves to the left). and stops repeatedly, making Q 1 and Q 2 extremely unstable. In the present invention, the instability of the final plasticizing ability Q 2 of the second stage b (fluctuations in the plasticizing time for each round and temporal fluctuations in the screw retraction speed) is acknowledged, and the The plasticization (supply) capacity Q 1 of Q1 is adaptively controlled. The supply capacity of the first stage a is
It is determined by the screw dimension, molding conditions, screw cylinder surface roughness, screw surface roughness, etc. In addition, by incorporating a keyed sleeve, the first
The supply capacity Q1 of stage a is proportional to some extent to the number and depth of the grooves in the keyed sleeve. Applying this, the resin pressure for predicting vent-up is set in advance in the resin pressure transducer 8 with set value and contact output. If the resin pressure level while the screw is rotating is below the set pressure, the solenoid valve e is turned on, the keyed sleeve capacity operates at maximum (keys 12a and 12b are retracted), and the plasticizing capacity Q1 of the first stage reaches its maximum. Become. When the resin pressure level exceeds the set pressure, the solenoid valve f is turned on and the keys 12a and 12b are activated to stroke S.
1, S2 is pushed in, and the screw cylinder 2 becomes a general cylinder without grooves, the plasticizing ability of the first stage a gradually decreases, and the relationship of Q 2 > Q 1 is restored, and vent up is prevented immediately. . At this time, if the plasticizing ability Q 1 decreases more than necessary, the plasticizing ability Q 2 will also decrease, so the keys 12a and 12b are controlled in multiple stages (first, only 12a is activated, and even after a certain period of time has passed, the resin pressure still remains). If the set value is exceeded, 12b is further activated), thereby making it possible to perform more optimal control. All keyed sleeve adjustments are performed while the screw is rotating, and the load pressure of the screw rotation hydraulic motor 10 is distributed to the hydraulic cylinders 11a and 11b.
Operating stroke S of hydraulic cylinders 11a, 11b
1. S2 is within 10mm and does not operate frequently, so it has almost no effect on the screw rotation speed. Note that, as a simplified version of the device of the present invention, there is program control that does not implement feedback control. In other words, from the start of operation to steady operation, the number of key grooves in the keyed sleeve should be 2 to 2.
A method of controlling the program in three stages in chronological order can also be implemented. Further, in addition to the resin pressure gauge 7, a thermocouple or a microswitch may be used in the vent hole 5 as a sensor. Note that when changing the sensor, the resin pressure transducer 8 also changes. On the other hand, it is also possible to use a servo valve instead of the solenoid valve 9 to control the key position steplessly. Example: The sensitivity of the resin delivery rate increase rate to the volume change of the keyed sleeve is 0.7/0.3%/cm 3 for polystyrene/polypropylene (keyway width g = 33
mm, keyway depth s=4mm, keyway length l=145mm
It was highly effective (12.5%/5.5% per key). Also, the sensitivity to keyway width is -0.2/-0.4
%/mm, which was slightly smaller than the above sensitivity, but the effect of reducing the keyway width was recognized. Therefore, it has been found that the amount of resin delivered can be controlled by setting the number and width of the keyways and controlling the depth. Table 1 below shows test data on changes in resin delivery amount with respect to changes in volume of the keyed sleeve.

【表】 し量増加率 キードスリーブなしの時の
脂送り出し量(Kg／h)
以上のテスト結果を第４図〜第６図に示す。 第４図及び第５図によりキー溝幅ｇ＝33mm、キ
ー溝長さｌ＝145mmで一定の時、樹脂送り出し量
増加率は、キー溝深さｓの増加と大略比例し、従
つて樹脂送り出し量増加率はキー溝の体積増加と
大略比例する。 また第６図のキー溝の数と幅を変えたテスト結
果より、キー溝幅の感度は、キー溝数（即ちキー
溝の体積）の感度より小さいが、樹脂送り出し量
はキー溝数に大略比例する。 以上の如く樹脂送り出し量増加率の感度は、Ｖ
＝76.6cm3の時 (イ) キー溝の単位体積当り ポリスチロールの場合、0.7％／cm3 ポリプロピレンの場合、0.3％／cm3 (ロ) キー溝の単位幅当り ポリスチロールの場合、0.2％／mm ポリプロピレンの場合、0.4％／mm の感度を有し、キードスリーブの体積制御による
樹脂送り出し量制御の効果は大であつた。 以上詳細に説明した如く本発明は構成されてい
るので、ベント孔後部の可塑化能力が、ベント孔
前部の可塑化能力より大になつたことをセンサが
検知すると、複数個のキードスリーブの夫々のキ
ーを独立して段階的又は無段階に摺動させて、前
記ベント孔後部の可塑化能力を前部より小にする
よう自動的にコントロールすることができる。従
つて本発明によると、ベントアツプ直前に、また
は軽微な状態でベントアツプが防止されるので、
運転立上りの生産ロス（人工費、成形不良品）を
減少させることができる。また定常運転時に外乱
（室温、油温、原料樹脂ロツトのバラツキなど）
があつても、ベントアツプが防止でき、生産ロス
が減少する。更にオペレータの負担が減るので、
複数機運転が可能であり、スクリユ１本で幅広く
樹脂と金型への対応ができる。[Table] Keyed amount increase rate without keyed sleeve
Fat delivery amount (Kg/h)
The above test results are shown in FIGS. 4 to 6. 4 and 5, when the keyway width g = 33 mm and the keyway length l = 145 mm are constant, the rate of increase in the resin feed amount is approximately proportional to the increase in the keyway depth s, and therefore the resin feed rate is The volume increase rate is roughly proportional to the volume increase of the keyway. Also, from the test results of changing the number and width of keyways shown in Figure 6, the sensitivity of the width of the keyway is smaller than the sensitivity of the number of keyways (i.e. the volume of the keyway), but the amount of resin delivered is approximately the same as the number of keyways. Proportional. As described above, the sensitivity of the resin delivery amount increase rate is V
= 76.6 cm 3 (a) Per unit volume of keyway For polystyrene: 0.7%/cm 3 For polypropylene, 0.3%/cm 3 (b) Per unit width of keyway For polystyrene: 0.2% /mm In the case of polypropylene, the sensitivity was 0.4%/mm, and the effect of controlling the resin delivery amount by controlling the volume of the keyed sleeve was great. Since the present invention is configured as described above in detail, when the sensor detects that the plasticizing ability at the rear of the vent hole has become larger than the plasticizing ability at the front of the vent hole, the plurality of keyed sleeves The plasticizing capacity of the rear part of the vent hole can be automatically controlled to be smaller than that of the front part by independently sliding each key stepwise or steplessly. Therefore, according to the present invention, vent-up is prevented immediately before vent-up or in a minor condition.
Production losses (labor costs, defective molded products) at the start of operation can be reduced. Also, disturbances during steady operation (room temperature, oil temperature, variations in raw resin lot, etc.)
Even if there is a problem, vent-up can be prevented and production loss can be reduced. Furthermore, the burden on the operator is reduced,
It is possible to operate multiple machines, and one screw can handle a wide range of resins and molds.

【図面の簡単な説明】[Brief explanation of the drawing]

第１図は従来のベント型射出成形機の側断面
図、第２図は本発明の実施例を示すベント成形機
の側断面図、第３図は第２図のＡ〜Ａ断面図、第
４図はキードスリーブ溝体積と樹脂送り出し量を
示す線図、第５図はキードスリーブ溝深さと樹脂
送り出し量を示す線図、第６図はキードスリーブ
溝本数と樹脂送り出し量を示す線図である。 図の主要部分の説明、１……ベントスクリユ、
２……スクリユシリンダ、５……ベント孔、７…
…樹脂圧力センサ、８……樹脂圧力変換器、９…
…電磁弁、１１ａ，１１ｂ……油圧シリンダ、１
２ａ，１２ｂ……キー、１３ａ，１３ｂ……ピス
トン。 Fig. 1 is a side sectional view of a conventional vent-type injection molding machine, Fig. 2 is a side sectional view of a vent molding machine showing an embodiment of the present invention, and Fig. 3 is a sectional view taken from A to A in Fig. 2; Figure 4 is a diagram showing the keyed sleeve groove volume and resin delivery amount, Figure 5 is a diagram showing the keyed sleeve groove depth and resin delivery amount, and Figure 6 is a diagram showing the keyed sleeve groove number and resin delivery amount. It is a line diagram. Explanation of the main parts of the diagram, 1...Bent screw,
2... Screw cylinder, 5... Vent hole, 7...
...Resin pressure sensor, 8...Resin pressure transducer, 9...
...Solenoid valve, 11a, 11b...Hydraulic cylinder, 1
2a, 12b...key, 13a, 13b...piston.

Claims (1)

【特許請求の範囲】[Claims] １ ベント射出、押出成形機のベント成形方法に
おいて、ベントアツプ直前の状態をセンサで検出
し、この電気信号により調整可能な複数個のキー
ドスリーブをホツパの下部に設置し、まだ溶融し
ていない固体樹脂とシリンダ内壁の摩擦係数を増
加するため同キードスリーブの夫々のキーを独立
して段階的又は無段階に摺動させるようプログラ
ム又はフイードバツクコントロールすることを特
徴とするベント成形方法。1 In vent molding methods for vent injection and extrusion molding machines, a sensor detects the state immediately before vent up, and multiple keyed sleeves that can be adjusted based on this electrical signal are installed at the bottom of the hopper to remove solids that have not yet melted. A vent molding method characterized by program or feedback control to slide each key of the keyed sleeve independently in a stepwise or stepless manner in order to increase the coefficient of friction between the resin and the inner wall of the cylinder.
JP57059151A 1982-04-09 1982-04-09 Vent molding method Granted JPS58175641A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP57059151A JPS58175641A (en) 1982-04-09 1982-04-09 Vent molding method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP57059151A JPS58175641A (en) 1982-04-09 1982-04-09 Vent molding method

Publications (2)

Publication Number Publication Date
JPS58175641A JPS58175641A (en) 1983-10-14
JPS6358690B2 true JPS6358690B2 (en) 1988-11-16

Family

ID=13105054

Family Applications (1)

Application Number Title Priority Date Filing Date
JP57059151A Granted JPS58175641A (en) 1982-04-09 1982-04-09 Vent molding method

Country Status (1)

Country Link
JP (1) JPS58175641A (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3744193C1 (en) * 1987-12-24 1989-01-26 Berstorff Gmbh Masch Hermann Process and extruder for degassing thermoplastic plastic melts over a wide range of viscosities
JPH05147094A (en) * 1991-12-02 1993-06-15 Japan Steel Works Ltd:The Deaeration extruder
JP2001073933A (en) * 1999-09-01 2001-03-21 Bridgestone Corp Positive-displacement extruding machine and extruding method for viscous material
EP1629958A1 (en) * 2004-08-30 2006-03-01 Plastik Textile S.p.a. Barrel processor having a degassing means

Also Published As

Publication number Publication date
JPS58175641A (en) 1983-10-14

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