JP2949779B2 - Method for producing injection molded article having hollow structure - Google Patents
Method for producing injection molded article having hollow structureInfo
- Publication number
- JP2949779B2 JP2949779B2 JP13699890A JP13699890A JP2949779B2 JP 2949779 B2 JP2949779 B2 JP 2949779B2 JP 13699890 A JP13699890 A JP 13699890A JP 13699890 A JP13699890 A JP 13699890A JP 2949779 B2 JP2949779 B2 JP 2949779B2
- Authority
- JP
- Japan
- Prior art keywords
- mold
- gas
- pressurized gas
- injection
- check valve
- 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 - Lifetime
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
- B29C45/1703—Introducing an auxiliary fluid into the mould
- B29C45/1734—Nozzles therefor
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
- Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)
Description
【発明の詳細な説明】 〔産業上の利用分野〕 本発明は、ひけや反りのない外観の美麗な成形品を射
出成形する方法に関する。さらに詳細には、金型内に射
出注入された溶融樹脂の内部に金型内より加圧ガス体を
圧入して中空構造を有する射出成形品を製造する方法に
係わる。Description: FIELD OF THE INVENTION The present invention relates to a method for injection-molding a beautiful molded article having an appearance without sink marks and warpage. More specifically, the present invention relates to a method for manufacturing an injection-molded article having a hollow structure by press-fitting a pressurized gas body from inside a mold into molten resin injected and injected into the mold.
金型内に射出注入された溶融樹脂の内部に加圧ガス体
を圧入して中空構造を有する成形品を製造する方法は知
られている。この方法においては、金型内の溶融樹脂は
その内部の加圧ガス体の圧力の作用を受けて外向きに流
動し、金型表面に押し付けられ、その結果、金型形状を
正確に転写した成形品が得られることが知られており、
ひけや反りのない外観の美麗な射出成形品の製造方法と
して実用化が図られている。There is known a method of manufacturing a molded article having a hollow structure by press-fitting a pressurized gas body into a molten resin injected and injected into a mold. In this method, the molten resin in the mold flows outward under the action of the pressure of the pressurized gas body inside the mold and is pressed against the mold surface, and as a result, the mold shape is accurately transferred. It is known that molded products can be obtained,
It has been put to practical use as a method for producing a beautiful injection-molded article having an appearance without sink marks and warpage.
この方法において、加圧ガス体を溶融樹脂の内部に圧
入するに当って加圧ガス体を金型内から注入する方法が
あり、加圧ガス体の圧入は金型キヤビテイあるいは射出
樹脂流路に連通して配置された加圧ガス体注入ノズルを
介して行なわれる。溶融樹脂は、加圧下に金型内に注入
されるので、金型への充填時に充填圧が発生する。この
充填圧によって溶融樹脂は金型内に配置された加圧ガス
体注入ノズル内にまで達し、ここで樹脂がノズルや金型
へ熱をうばわれ、冷却されて固化する危険が極めて高
い。加圧ガス体は、溶融樹脂が金型キヤビテイに充填さ
れたのちにあるいは充填されている間に注入ノズルを介
して溶融樹脂内に圧入されるので、注入ノズル内に逆流
した樹脂が固化すると注入ノズルが閉塞されることにな
り、加圧ガス体を圧入する事ができない場合がある。In this method, there is a method of injecting a pressurized gas body from inside a mold when pressurizing the pressurized gas body into a molten resin, and press-fitting the pressurized gas body into a mold cavity or an injection resin flow path. It is performed through a pressurized gas body injection nozzle arranged in communication. Since the molten resin is injected into the mold under pressure, a filling pressure is generated when filling the mold. Due to this filling pressure, the molten resin reaches the inside of the pressurized gas body injection nozzle arranged in the mold, where the resin is exposed to heat in the nozzle and the mold, and there is an extremely high risk of being cooled and solidified. The pressurized gas is injected into the molten resin via the injection nozzle after or while the molten resin is being filled into the mold cavity, so injection is performed when the resin flowing back into the injection nozzle is solidified. The nozzle may be blocked, and the pressurized gas may not be able to be injected.
本発明は、前述の従来技術の欠陥を解消することを目
的とするもので、具体的には、加圧ガス体注入ノズルへ
の溶融樹脂の逆流に伴う注入ノズルの閉塞を防止し、加
圧ガス体の溶融樹脂内部への円滑な圧入を実現すること
を目的とする。The present invention aims to solve the above-mentioned deficiencies of the prior art, and specifically, to prevent the injection nozzle from being clogged due to the backflow of the molten resin to the pressurized gas injection nozzle, An object is to realize a smooth press-fitting of a gas body into a molten resin.
すなわち、本発明は、金型内に射出注入された溶融樹
脂の内部に加圧ガス体注入ノズルを用いて金型内より加
圧ガス体を圧入し、中空構造を有する射出成形品を製造
するに当り、該加圧ガス体注入ノズルのガス注入孔の先
端に逆止弁を配設し、該逆止弁部分を含むノズル先端を
別にセットされた加熱装置で加熱して逆止弁近傍のガス
流路で樹脂が固化することを防止することを特徴とする
射出成形方法に関する。That is, according to the present invention, a pressurized gas body is press-fitted from the inside of the mold using a pressurized gas body injection nozzle into the molten resin injected into the mold to produce an injection molded product having a hollow structure. In the meantime, a check valve is disposed at the tip of the gas injection hole of the pressurized gas body injection nozzle, and the nozzle tip including the check valve portion is heated by a heating device set separately, and the vicinity of the check valve is heated. The present invention relates to an injection molding method characterized in that a resin is prevented from solidifying in a gas flow path.
前述の通り、金型内に射出注入された溶融樹脂の内部
に加圧ガス体注入ノズルを用いて金型内より加圧ガス体
を圧入する方法においては、金型内での充填圧によって
溶融樹脂は加圧ガス体注入ノズルまで達し、冷却されて
固化した樹脂がガス流路を閉塞する危険があり、本発明
では注入ノズルへの溶融樹脂の逆流をガス注入孔に逆止
弁を配設することによって防止する。As described above, in the method of injecting a pressurized gas body from the mold using a pressurized gas body injection nozzle into the molten resin injected and injected into the mold, the molten resin is melted by the filling pressure in the mold. The resin reaches the pressurized gas body injection nozzle, and there is a risk that the cooled and solidified resin may block the gas flow path. In the present invention, a check valve is provided in the gas injection hole to prevent the molten resin from flowing back into the injection nozzle. Prevent by doing.
ここで、加圧ガス体注入ノズルにおける逆止弁の配設
位置としては、加圧ガス体注入ノズルのガス注入孔、す
なわち、注入ノズルの端部で金型キヤビティ又は樹脂の
流路に近い位置であるべきである。ガス注入孔は、通
常、注入ノズルの先端に設けられたガス吐出のための開
口部と開口部に連結する配管系から構成されており、逆
止弁はこの配管系内部に設置される。Here, as the disposition position of the check valve in the pressurized gas body injection nozzle, the gas injection hole of the pressurized gas body injection nozzle, that is, a position close to the mold cavity or the resin flow path at the end of the injection nozzle. Should be. The gas injection hole is generally composed of an opening for discharging gas provided at the tip of the injection nozzle and a piping system connected to the opening, and the check valve is installed inside this piping system.
上記逆止弁によって加圧ガス体注入ノズルへの溶融樹
脂の逆流は阻止されるものの、成形品や金型の形状、樹
脂の種類、成形条件等によってはノズルを伝っての金型
への熱の放散により逆止弁付近で溶融樹脂が冷却され、
粘度の上昇に伴うガス流入の阻害が生じたり、固化によ
るガス注入孔の閉塞を招いたり、金型面と成形品表面と
の間からガスが洩れるといった障害が起る。本発明では
かかる不都合を解消して金型内の溶融樹脂の内部へ円滑
に加圧ガス体を注入するために、逆止弁部分を含むノズ
ル先端を別に設けた加熱装置で加熱する。Although the check valve prevents the backflow of the molten resin to the pressurized gas injection nozzle, depending on the shape of the molded product or the mold, the type of the resin, the molding conditions, etc., the heat flowing to the mold through the nozzle may be reduced. The molten resin is cooled near the check valve by the dissipation of
Obstructions such as obstruction of gas inflow due to an increase in viscosity, blockage of gas injection holes due to solidification, and leakage of gas from between the mold surface and the molded product surface occur. In the present invention, in order to eliminate the inconvenience and to smoothly inject the pressurized gas into the molten resin in the mold, the nozzle tip including the check valve portion is heated by a heating device provided separately.
本発明の方法において用いられる加熱装置としては、
電熱加熱、赤外線加熱あるいは誘電加熱によって熱を供
給する装置を挙げることができる。これらの電熱加熱
器、赤外線加熱器あるいは誘電加熱器で構成される加熱
装置は、逆止弁を配設した加圧ガス体注入ノズルの先端
部分を加熱、保温するように設置される。As the heating device used in the method of the present invention,
An apparatus for supplying heat by electric heating, infrared heating or dielectric heating can be used. A heating device composed of these electric heaters, infrared heaters or dielectric heaters is installed so as to heat and keep the tip of a pressurized gas body injection nozzle provided with a check valve.
金型内へ射出注入された溶融樹脂は、金型キヤビテイ
を満すと同時に逆止弁を配設したガス注入孔の先端部内
部にも配位されるが、本発明の方法によれば、当該ガス
注入孔の先端部分を加熱することによってガス注入孔に
逆流した溶融樹脂の冷却が抑制され、樹脂の固化による
ガス流路の閉塞が遅くなる。加圧ガス体はこのように保
温された逆止弁を通ってガス流路の固化による閉塞前に
金型内の溶融樹脂の内部へ圧入され、所望の中空構造を
有する成形体が形成される。すなわち、加熱装置で加
熱、保温されているガス注入孔付近では、樹脂は高温溶
融状態ないしは加圧ガス体の圧力によって容易に変形す
る程度に保温されており、加圧ガス体注入ノズルへ加圧
ガスを導通することによって、加圧ガスは円滑に金型内
の溶融樹脂の内部へ圧入される。The molten resin injected and injected into the mold is also positioned inside the tip of the gas injection hole provided with the check valve at the same time as filling the mold cavity, but according to the method of the present invention, By heating the tip portion of the gas injection hole, the cooling of the molten resin flowing back to the gas injection hole is suppressed, and the blockage of the gas flow path due to the solidification of the resin is delayed. The pressurized gas body is pressed into the inside of the molten resin in the mold before the blockage due to the solidification of the gas flow path through the check valve kept warm in this way, and a molded body having a desired hollow structure is formed. . In other words, in the vicinity of the gas injection hole heated and kept warm by the heating device, the resin is kept in a high-temperature molten state or kept warm enough to be easily deformed by the pressure of the pressurized gas body. By passing the gas, the pressurized gas is smoothly pressed into the molten resin in the mold.
本発明の加圧ガス体注入ノズルを用いて金型内の溶融
樹脂の内部に金型から加圧ガス体を圧入し、所望の形状
に形成された成形体は、中空構造部に圧入されている加
圧ガス体の圧力作用を維持しながら冷却され、冷却が完
了すると金型から取り出されるが、成形品を金型から取
り出す際に前記中空構造部に残存している加圧ガス体の
圧力作用によって成形品が変形するのを防止するため
に、金型を開くに先立って加圧ガス体注入ノズルを例え
ば往復運動によって移動し、中空構造部の加圧状態を開
放する態様は、中空構造分の放圧に伴う樹脂片やごみの
飛沫同伴によるガス注入孔の閉塞が防止でき、実用的で
ある。The pressurized gas body is press-fitted from the mold into the molten resin in the mold using the pressurized gas body injection nozzle of the present invention, and the molded body formed into a desired shape is press-fitted into the hollow structure portion. The pressurized gas body is cooled while maintaining the pressure action of the pressurized gas body, and is taken out of the mold when the cooling is completed. When the molded product is taken out of the mold, the pressure of the pressurized gas body remaining in the hollow structure portion is reduced. In order to prevent the molded product from being deformed by the action, before opening the mold, the pressurized gas body injection nozzle is moved by, for example, reciprocating motion to open the pressurized state of the hollow structure portion. Blocking of the gas injection hole due to entrainment of resin pieces and dust accompanying the pressure release for a minute can be prevented, which is practical.
以上述べたごとく、ガス注入孔の先端に逆止弁を配設
し、そのガス注入孔の先端部分を別に設けた加熱装置で
加熱する本発明の方法によれば、加圧ガス体注入ノズル
への樹脂の逆流に伴うガス流路の閉塞がなく、金型キヤ
ビテイ内の溶融樹脂の内部に円滑に加圧ガス体の注入を
行うことができ、安定して連続サイクルで所望の中空構
造を有する成形品を射出成形することを可能にする。As described above, according to the method of the present invention in which the check valve is disposed at the tip of the gas injection hole and the tip portion of the gas injection hole is heated by a heating device provided separately, The pressurized gas body can be smoothly injected into the molten resin in the mold cavity without blockage of the gas flow path due to the backflow of the resin, and has a desired hollow structure in a continuous continuous cycle. Enables injection molding of molded articles.
実施例 図によって実施例を説明する。 Example An example will be described with reference to the drawings.
金型の可動型（１）側にシリンダー（図示せず）駆動
によって往復運動する加圧ガス体注入ノズル（５）を設
けた。このノズルはその先端からガス加圧導入ピストン
（９）に連結されたガス体導通管（６）に通じるガス体
の流路（13）を持ち、ノズルの先端部にはガス流路（1
3）内に逆止弁（11）が配設されたガス体注入孔（12）
を設けた。逆止弁を含むガス体注入ノズル（５）の先端
部分の外周に電熱式リングヒーター（16）を設けた。ガ
ス体注入ノズルの先端のガス体注入孔（12）は金型キヤ
ビテイ内に向けて開口し、開口部分の周りのノズル本体
部分が成形時に金型と密着し、樹脂がキヤビテイまたは
ガス体注入孔の外へ流出するのを防止するように固定型
（２）を設計した。A pressurized gas injection nozzle (5) that reciprocates by driving a cylinder (not shown) is provided on the movable mold (1) side of the mold. This nozzle has a gas passage (13) leading from its tip to a gas passage (6) connected to a gas pressure introduction piston (9), and a gas passage (1) is provided at the tip of the nozzle.
3) Gas injection hole (12) with check valve (11) arranged inside
Was provided. An electrothermal ring heater (16) was provided on the outer periphery of the tip of the gas injection nozzle (5) including the check valve. The gas injection hole (12) at the tip of the gas injection nozzle opens into the mold cavity, the nozzle body around the opening closely adheres to the mold during molding, and the resin fills the cavity or gas injection hole. The fixed type (2) was designed so as to prevent the outflow from the outside.
変性ポリフエニレンエーテル樹脂（三菱瓦斯化学株式
会社製、商品名「ユピエース AN30」を射出成形機シリ
ンダー（３）内で樹脂温度270℃に溶融、可塑化し、射
出圧力750kg/cm2にて前記金型キヤビテイ（４）内に射
出、注入した。ガス体注入ノズルの先端部はリングヒー
ター（16）によって280℃に加熱、保温されていた。射
出開始後3.5秒後に射出動作を停止し、同時に加圧ガス
体注入ノズルよりガス計量シリンダー（８）で計量され
た100kg/cm2の圧縮窒素ガスをピストン（ａ）で圧入し
た。Modified polyphenylene ether resin (Mitsubishi Gas Chemical Co., Ltd., product name "UPIACE AN30") is melted and plasticized at a resin temperature of 270 ° C in a cylinder (3) of an injection molding machine, and the metal is melted at an injection pressure of 750 kg / cm 2 The tip of the gas injection nozzle was heated and maintained at 280 ° C. by a ring heater (16), and the injection operation was stopped 3.5 seconds after the start of injection, and the injection was simultaneously performed. 100 kg / cm 2 of compressed nitrogen gas measured by a gas measuring cylinder (8) from a pressurized gas injection nozzle was injected with a piston (a).
ノズルの先端の逆止弁は正常に作動し、かつ樹脂中へ
の圧縮ガスの注入は円滑に行われたことから、逆止弁を
含むガス体注入孔部分の保温が十分に行われたことが判
る。The check valve at the tip of the nozzle operated normally, and the injection of compressed gas into the resin was performed smoothly, so that the gas injection hole including the check valve was sufficiently warmed. I understand.
得られた成形品には、厚肉部に貫通した中空構造が形
成されており、ひけや反りは見られず、外観の美麗な製
品であった。The obtained molded product had a hollow structure penetrating through the thick part, and was free of sink marks and warpage and had a beautiful appearance.
比較例 逆止弁（11）を含むガス注入ノズルの先端部分にリン
グヒーターを設置せずに行なった以外は、実施例の操作
を繰り返した。Comparative Example The operation of the example was repeated except that the ring heater was not installed at the tip of the gas injection nozzle including the check valve (11).
圧縮窒素ガスのキヤビテイ内への圧入が行なわれない
ことが観察されたので、金型の冷却後加圧ガス体注入ノ
ズルを調べたところ、樹脂は逆止弁によって逆流を阻止
されているものの固化してガス注入孔を閉塞しているこ
とが判った。Since it was observed that the compressed nitrogen gas was not injected into the cavity, the injection nozzle of the pressurized gas body was examined after cooling the mold. It was found that the gas injection hole was closed.
得られた成形品は、厚肉部にひけが見られ、反りが生
じたが、圧縮ガスの圧入が不成功に終った結果である。In the obtained molded product, sink was observed in the thick portion and warpage occurred, but this was the result of unsuccessful pressurized gas injection.
第１図は、本発明の実施態様を示す概念図である。第２
図は、第１図Ａ部分の拡大図である。 1:可動型、2:固定型 3:射出成形機シリンダー 4:成形品キヤビテイ、5:ガス体注入ノズル 6:ガス体導通管、7:ガス体供給管 8:ガス計量シリンダー 9:ガス加圧導入ピストン 10:制御弁、11:逆止弁 12:ガス体注入孔、13:ガス体流路 14:チエツク弁、15:窒素ガスボンベ 16:リングヒーターFIG. 1 is a conceptual diagram showing an embodiment of the present invention. Second
The figure is an enlarged view of the portion A in FIG. 1: Movable type, 2: Fixed type 3: Injection molding machine cylinder 4: Molded product cavity, 5: Gas injection nozzle 6: Gas conduction tube, 7: Gas supply tube 8: Gas metering cylinder 9: Gas pressurization Introduction piston 10: Control valve, 11: Check valve 12: Gas injection hole, 13: Gas flow path 14: Check valve, 15: Nitrogen gas cylinder 16: Ring heater
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 昭64−14012（ＪＰ，Ａ) 特開 平１−154718（ＪＰ，Ａ) 特開 平１−196318（ＪＰ，Ａ) 実開 平３−88711（ＪＰ，Ｕ) (58)調査した分野(Int.Cl.6，ＤＢ名) B29C 45/00 - 45/84 ──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A 64-14012 (JP, A) JP-A-1-154718 (JP, A) JP-A-1-196318 (JP, A) 88711 (JP, U) (58) Fields investigated (Int. Cl. 6 , DB name) B29C 45/00-45/84
Claims (4)
加圧ガス体注入ノズルを用いて金型内より加圧ガス体を
圧入し、中空構造を有する射出成形品を製造するに当
り、該加圧ガス体注入ノズルのガス注入孔の先端に逆止
弁を配設し、該逆止弁部分を含むノズル先端を加熱装置
によって加熱することを特徴とする方法。1. A pressurized gas body is press-fitted from a mold using a pressurized gas body injection nozzle into a molten resin injected into a mold to produce an injection molded product having a hollow structure. A check valve is disposed at a tip of a gas injection hole of the pressurized gas body injection nozzle, and the nozzle tip including the check valve portion is heated by a heating device.
特許請求の範囲第１項記載の方法。2. The method according to claim 1, wherein the heating device comprises an electric heater.
用いる特許請求の範囲第１項記載の方法。3. A method according to claim 1, wherein a heating device comprising an infrared heater is used.
いる特許請求の範囲第１項記載の方法。4. The method according to claim 1, wherein a heating device comprising a dielectric heater is used.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13699890A JP2949779B2 (en) | 1990-05-29 | 1990-05-29 | Method for producing injection molded article having hollow structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13699890A JP2949779B2 (en) | 1990-05-29 | 1990-05-29 | Method for producing injection molded article having hollow structure |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0431015A JPH0431015A (en) | 1992-02-03 |
| JP2949779B2 true JP2949779B2 (en) | 1999-09-20 |
Family
ID=15188404
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP13699890A Expired - Lifetime JP2949779B2 (en) | 1990-05-29 | 1990-05-29 | Method for producing injection molded article having hollow structure |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2949779B2 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TW235269B (en) * | 1993-03-05 | 1994-12-01 | Mitsubishi Gas Chemical Co | |
| US5545027A (en) | 1993-06-02 | 1996-08-13 | Mitsubishi Gas Chemical Company, Inc. | Gas-feeding device for injection molding |
| JP3414459B2 (en) * | 1993-11-15 | 2003-06-09 | 三菱エンジニアリングプラスチックス株式会社 | Gas injection nozzle |
-
1990
- 1990-05-29 JP JP13699890A patent/JP2949779B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0431015A (en) | 1992-02-03 |
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