JP2000006221A - Injection molding device - Google Patents
Injection molding deviceInfo
- Publication number
- JP2000006221A JP2000006221A JP18247698A JP18247698A JP2000006221A JP 2000006221 A JP2000006221 A JP 2000006221A JP 18247698 A JP18247698 A JP 18247698A JP 18247698 A JP18247698 A JP 18247698A JP 2000006221 A JP2000006221 A JP 2000006221A
- Authority
- JP
- Japan
- Prior art keywords
- temperature
- injection molding
- screw
- heat medium
- 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.)
- Pending
Links
Landscapes
- Injection Moulding Of Plastics Or The Like (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、合成樹脂の射出成
形装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a synthetic resin injection molding apparatus.
【０００２】[0002]
【従来の技術】従来、合成樹脂の押出成形では、スクリ
ュー内に液状の熱媒体を循環させ、押出機の出口から金
型に供給される溶融樹脂の温度を制御する技術が知られ
ている。これによって、押出機内で溶融された合成樹脂
が熱分解温度以上に過熱されることを防止したり、溶融
樹脂温度を一定に保つことで品質の安定した成形品を成
形できる。2. Description of the Related Art Conventionally, in extrusion molding of a synthetic resin, a technique is known in which a liquid heat medium is circulated in a screw to control the temperature of a molten resin supplied to a mold from an outlet of an extruder. As a result, it is possible to prevent the synthetic resin melted in the extruder from being overheated to a temperature higher than the thermal decomposition temperature, or to form a molded product having stable quality by keeping the molten resin temperature constant.
【０００３】[0003]
【発明が解決しようとする課題】しかしながら、上記の
従来技術を射出成形で用いると、熱媒体の温度が一定に
保たれていても、押出成形と異なり射出成形ではスクリ
ュー動作が非定常であることから、スクリュー温度が不
均一になりやすく、このため溶融温度を一定に保つこと
が困難で、成形品質に悪影響を及ぼす危険があった。However, when the above-mentioned prior art is used in injection molding, even if the temperature of the heating medium is kept constant, unlike in extrusion molding, the screw operation is unsteady in injection molding. Therefore, the screw temperature tends to be non-uniform, and it is difficult to keep the melting temperature constant, and there is a risk of adversely affecting the molding quality.
【０００４】本発明は、上記従来技術の問題を解決する
ためになされたもので、最適な溶融条件で合成樹脂を金
型に射出できる射出成形装置を提供することを目的とし
ている。The present invention has been made to solve the above-mentioned problems of the prior art, and has as its object to provide an injection molding apparatus capable of injecting a synthetic resin into a mold under optimum melting conditions.
【０００５】[0005]
【課題を解決するための手段】請求項１記載の発明は、
シリンダーと、シリンダー内に内蔵された回転スクリュ
ーとを備えた射出成形装置において、スクリュー内部を
流動する熱媒体と、シリンダーヘッドまたはノズル部に
設置された温度センサーと、前記温度センサーで検出さ
れた検出値を、予め記憶しておいた温度範囲と比較して
調節温度を算出する制御手段と、前記調節温度に基づい
て前記熱媒体の温度を調整する温度調節機を有するもの
である。According to the first aspect of the present invention,
In an injection molding apparatus provided with a cylinder and a rotary screw built in the cylinder, a heating medium flowing inside the screw, a temperature sensor installed in a cylinder head or a nozzle portion, and detection detected by the temperature sensor It has control means for comparing the value with a previously stored temperature range to calculate an adjusted temperature, and a temperature controller for adjusting the temperature of the heat medium based on the adjusted temperature.
【０００６】（作用）請求項１記載の射出成形装置は、
温度センサーで検出された検出値を、予め記憶しておい
た温度範囲と比較して調節温度を算出する制御手段と、
前記調節温度に基づいて前記熱媒体の温度を調整する温
度調節機を有しているので、スクリュー内部を流動する
温度調整された熱媒体によってスクリュー温度が均一と
なり、その結果、溶融温度を一定に保って最適な溶融条
件で合成樹脂を金型に射出して成形することができる。(Function) The injection molding apparatus according to claim 1 is
Control means for calculating a regulated temperature by comparing the detected value detected by the temperature sensor with a previously stored temperature range;
Since it has a temperature controller that adjusts the temperature of the heat medium based on the adjusted temperature, the screw temperature becomes uniform due to the temperature adjusted heat medium flowing inside the screw, and as a result, the melting temperature becomes constant. The synthetic resin can be injected into a mold and molded under the optimal melting conditions while maintaining the same.
【０００７】[0007]
【発明の実施の形態】以下、本発明の実施の形態を図面
を参照して説明する。図１と図２は、本発明の一実施例
であって、図１は、射出成形装置の説明図、図２はスク
リューの説明図である。図１と図２において、１は硬質
塩化ビニル樹脂用の射出成形装置であって、３５０トン
の型締め機構を備え、この射出成形装置１の出口に配管
継手の成形金型１０が設置されている。射出成形装置１
は、図１に示すように、シリンダー２と、シリンダー２
内に内蔵された口径７０ｍｍの回転スクリュー３とを備
えている。スクリュー３は、外周面に螺旋溝（図示略）
が形成され、スクリュー３の後端部から供給された合成
樹脂をシリンダー２内で溶融し、シリンダー２の先端に
設けられたノズル２２から射出し、成形金型１０に注入
される。上記スクリュー３は、その内部に熱媒体Ａ
（油）を供給する配管９を有している。そして、スクリ
ュー３の後端部にスタフィングボックス４が設けられ、
熱媒体Ａの往きと戻りの配管を接続している。このスタ
フィングボックス４の往きと戻りの配管は、温度調節機
５に接続されている。温度調節された熱媒体Ａは、上記
スクリュー３内の配管９に供給され、スクリュー３の先
端部に位置する配管９の出口から放出される。放出され
た熱媒体Ａは、スクリュー３と配管９の隙間を通り、ス
タフィングボックス４を経て温度調節機５に戻される。Embodiments of the present invention will be described below with reference to the drawings. 1 and 2 show an embodiment of the present invention. FIG. 1 is an explanatory view of an injection molding apparatus, and FIG. 2 is an explanatory view of a screw. 1 and 2, reference numeral 1 denotes an injection molding device for hard vinyl chloride resin, which is provided with a 350-ton mold clamping mechanism, and a piping joint molding die 10 is installed at an outlet of the injection molding device 1. I have. Injection molding equipment 1
Is a cylinder 2 and a cylinder 2 as shown in FIG.
And a rotary screw 3 having a diameter of 70 mm built therein. The screw 3 has a spiral groove (not shown) on the outer peripheral surface.
Is formed, the synthetic resin supplied from the rear end of the screw 3 is melted in the cylinder 2, injected from a nozzle 22 provided at the tip of the cylinder 2, and injected into the molding die 10. The screw 3 has a heating medium A inside.
It has a pipe 9 for supplying (oil). And a stuffing box 4 is provided at the rear end of the screw 3,
The outgoing and returning pipes of the heat medium A are connected. The forward and return pipes of the stuffing box 4 are connected to a temperature controller 5. The heat medium A whose temperature has been adjusted is supplied to the pipe 9 in the screw 3 and discharged from the outlet of the pipe 9 located at the tip of the screw 3. The released heat medium A passes through the gap between the screw 3 and the pipe 9 and returns to the temperature controller 5 via the stuffing box 4.
【０００８】シリンダー２の先端部に設けられているシ
リンダーヘッド２１とノズル２２部に温度センサー６、
６が設置されている。また、本実施例の射出成形装置１
は、変換装置７１とコンピューター７２とからなる制御
手段７を有している。上記変換装置７１は、温度センサ
ー６で検出された検出値を増幅してデジタル信号に変換
する変換手段であり、コンピューター７２は、演算処理
手段と記憶手段とを備え、温度センサー６で検出されデ
ジタル信号に変換された検出値を、予め記憶しておいた
温度範囲と比較して調節温度を算出する。上記制御手段
７で算出された調節温度値の信号が温度調節機５に送ら
れ、温度調節機５はこの調節温度に基づいて前記熱媒体
Ａの温度を調整する。A temperature sensor 6 is attached to a cylinder head 21 and a nozzle 22 provided at the tip of the cylinder 2.
6 are installed. Further, the injection molding apparatus 1 of the present embodiment
Has a control means 7 comprising a conversion device 71 and a computer 72. The conversion device 71 is a conversion unit that amplifies the detection value detected by the temperature sensor 6 and converts it to a digital signal. The computer 72 includes an arithmetic processing unit and a storage unit. The control value is calculated by comparing the detected value converted into the signal with a temperature range stored in advance. A signal of the adjusted temperature value calculated by the control means 7 is sent to the temperature controller 5, and the temperature controller 5 adjusts the temperature of the heat medium A based on the adjusted temperature.
【０００９】つぎに、上記構成になされた射出成形装置
１を使用した成形方法について説明する。シリンダの外
周に取り付けられた加熱ヒーターにより、シリンダー２
の温度を先端から後方に向かって、１８５℃−１８０℃
−１７５℃−１７０℃−１６５℃に設定した。また、ス
クリュー３内に供給される熱媒体Ａの温度調節機５の設
定温度を１８０℃とした。そして、成形材料である硬質
塩化ビニル樹脂をスクリュー３に供給し、この樹脂をス
クリュー３を６０回転／分の速度で回転させ、溶融した
樹脂を金型１０に射出し、冷却後金型１０を型開きして
成形品（継手）を取り出したところ、良好な成形品を得
た。上記の成形を４８時間連続して行ったが、成形され
た製品はいずれも光沢のある良好な外観を有し、ヤケ、
分解は全く発生せず、溶融混練不足によって生じる流れ
模様の発生もなかった。Next, a molding method using the injection molding apparatus 1 configured as described above will be described. The cylinder 2 is heated by a heater attached to the outer periphery of the cylinder.
185 ° C-180 ° C
The temperature was set at -175 ° C-170 ° C-165 ° C. The set temperature of the temperature controller 5 for the heat medium A supplied into the screw 3 was set to 180 ° C. Then, a hard vinyl chloride resin as a molding material is supplied to the screw 3, the resin is rotated at a speed of 60 revolutions / minute, the molten resin is injected into the mold 10, and after cooling, the mold 10 is cooled. When the mold was opened and the molded product (joint) was taken out, a good molded product was obtained. The above molding was performed continuously for 48 hours, and all the molded products had a good glossy appearance,
Decomposition did not occur at all, and there was no flow pattern caused by insufficient melting and kneading.
【００１０】（実施例の作用）本実施例の射出成形装置
１は、温度センサー６で検出された検出値を、予め記憶
しておいた温度範囲と比較して調節温度を算出する制御
手段７と、この調節温度に基づいて熱媒体Ａの温度を調
整する温度調節機５を有しているので、スクリュー３の
内部を流動する温度調整された熱媒体Ａによってスクリ
ュー温度が均一となり、その結果、溶融温度を一定に保
って最適な溶融条件で硬質塩化ビニル樹脂を金型１０に
射出して成形することができる。(Operation of the Embodiment) In the injection molding apparatus 1 of the embodiment, a control means 7 for calculating an adjustment temperature by comparing a detection value detected by the temperature sensor 6 with a temperature range stored in advance. And the temperature controller 5 that adjusts the temperature of the heat medium A based on the adjusted temperature, so that the temperature of the heat medium A that flows inside the screw 3 is adjusted to make the screw temperature uniform. The molding can be performed by injecting the hard vinyl chloride resin into the mold 10 under the optimum melting condition while keeping the melting temperature constant.
【００１１】（比較例）上記の実施例に対し、熱媒体Ａ
を供給せずスクリュー３の温度調節を行わないで成形し
たところ、成形時間が長くなると（２時間後）成形品に
ヤケが生じた。また、スクリュー３内に熱媒体Ａを供給
して温度調節したが、温度センサー６と制御手段７によ
る制御をせずに成形したところ、ショット毎のばらつき
が大きく、溶融、混練不足による流れ模様が全ショット
の内２５％を占め、良好な成形品が得られなかった。(Comparative Example) A heating medium A
When the molding was performed without supplying the water and controlling the temperature of the screw 3, the molded product was burned when the molding time was long (after 2 hours). Further, the temperature was adjusted by supplying the heat medium A into the screw 3. However, when the molding was performed without the control by the temperature sensor 6 and the control means 7, the variation between shots was large, and the flow pattern due to insufficient melting and kneading was reduced. This accounted for 25% of all shots, and a good molded product could not be obtained.
【００１２】以上、本発明の実施例を図面により詳述し
てきたが、具体的な構成はこの実施例に限られるもので
なく、本発明の要旨を逸脱しない範囲の変更があって
も、本発明に含まれる。例えば、実施例では、熱媒体Ａ
に油を使用したが、電気抵抗によるヒーターを使用して
スクリューの温度調節するものであってもよい。Although the embodiment of the present invention has been described in detail with reference to the drawings, the specific configuration is not limited to this embodiment. Included in the invention. For example, in the embodiment, the heat medium A
Although oil was used in the above, the temperature of the screw may be adjusted using a heater based on electric resistance.
【００１３】[0013]
【発明の効果】請求項１記載の射出成形装置によると、
溶融温度を一定に保って最適な溶融条件で合成樹脂を金
型に射出して成形することができるので、長時間での成
形でも安定して良好な製品を成形できる。また、熱安定
性が悪く分解を起こす成形材料であっても、熱分解によ
るトラブルを低減できる。According to the injection molding apparatus of the first aspect,
Since the synthetic resin can be injected into a mold under optimal melting conditions and molded at a constant melting temperature, a good product can be molded stably even over a long period of time. Moreover, even if the molding material has poor thermal stability and causes decomposition, troubles due to thermal decomposition can be reduced.
【図１】本発明の一実施例であって、射出成形装置の説
明図である。FIG. 1 is an explanatory view of an injection molding apparatus according to one embodiment of the present invention.
【図２】図１のスクリューの説明図である。FIG. 2 is an explanatory view of the screw in FIG. 1;
１ 射出成形装置 ２ シリンダー ２１ シリンダーヘッド ２２ ノズル ３ スクリュー ５ 温度調節機 ６ 温度センサー ７ 制御手段 Ａ 熱媒体 DESCRIPTION OF SYMBOLS 1 Injection molding apparatus 2 Cylinder 21 Cylinder head 22 Nozzle 3 Screw 5 Temperature controller 6 Temperature sensor 7 Control means A Heat medium
Claims (1)
た回転スクリューとを備えた射出成形装置において、 スクリュー内部を流動する熱媒体と、シリンダーヘッド
またはノズル部に設置された温度センサーと、前記温度
センサーで検出された検出値を、予め記憶しておいた温
度範囲と比較して調節温度を算出する制御手段と、前記
調節温度に基づいて前記熱媒体の温度を調整する温度調
節機を有することを特徴とする射出成形装置。1. An injection molding apparatus comprising a cylinder and a rotary screw built in the cylinder, a heat medium flowing inside the screw, a temperature sensor installed in a cylinder head or a nozzle portion, and the temperature sensor Control means for calculating the adjustment temperature by comparing the detection value detected in the above with a temperature range stored in advance, and a temperature controller for adjusting the temperature of the heat medium based on the adjustment temperature. Characteristic injection molding equipment.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18247698A JP2000006221A (en) | 1998-06-29 | 1998-06-29 | Injection molding device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18247698A JP2000006221A (en) | 1998-06-29 | 1998-06-29 | Injection molding device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2000006221A true JP2000006221A (en) | 2000-01-11 |
Family
ID=16118947
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP18247698A Pending JP2000006221A (en) | 1998-06-29 | 1998-06-29 | Injection molding device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2000006221A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2005032797A1 (en) * | 2003-10-02 | 2005-04-14 | Sumitomo Heavy Industries, Ltd. | Injection molding machine and method |
| JP2008230051A (en) * | 2007-03-20 | 2008-10-02 | Nissei Plastics Ind Co | Injection device equipped with screw heating circuit |
| SG153637A1 (en) * | 2000-06-30 | 2009-07-29 | Silverbrook Res Pty Ltd | Digital camera print cartridge holding print media ink and air filter |
| US20120145352A1 (en) * | 2007-05-24 | 2012-06-14 | Oskar Frech Gmbh + Co. Kg | Feed Block Unit, Feed System and Control Device for a Pressure Die-Casting Machine |
| US8287264B2 (en) * | 2005-09-28 | 2012-10-16 | Konica Minolta Opto, Inc. | Injection molding machine |
-
1998
- 1998-06-29 JP JP18247698A patent/JP2000006221A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SG153637A1 (en) * | 2000-06-30 | 2009-07-29 | Silverbrook Res Pty Ltd | Digital camera print cartridge holding print media ink and air filter |
| WO2005032797A1 (en) * | 2003-10-02 | 2005-04-14 | Sumitomo Heavy Industries, Ltd. | Injection molding machine and method |
| US8287264B2 (en) * | 2005-09-28 | 2012-10-16 | Konica Minolta Opto, Inc. | Injection molding machine |
| JP2008230051A (en) * | 2007-03-20 | 2008-10-02 | Nissei Plastics Ind Co | Injection device equipped with screw heating circuit |
| US20120145352A1 (en) * | 2007-05-24 | 2012-06-14 | Oskar Frech Gmbh + Co. Kg | Feed Block Unit, Feed System and Control Device for a Pressure Die-Casting Machine |
| US8302660B2 (en) * | 2007-05-24 | 2012-11-06 | Oskar Frech Gmbh + Co. Kg | Feed block unit, feed system and control device for a pressure die-casting machine |
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