JPH0431015A - Manufacture of injection molded product with hollow structure - Google Patents
Manufacture of injection molded product with hollow structureInfo
- Publication number
- JPH0431015A JPH0431015A JP13699890A JP13699890A JPH0431015A JP H0431015 A JPH0431015 A JP H0431015A JP 13699890 A JP13699890 A JP 13699890A JP 13699890 A JP13699890 A JP 13699890A JP H0431015 A JPH0431015 A JP H0431015A
- Authority
- JP
- Japan
- Prior art keywords
- gas
- gas injection
- check valve
- mold
- pressurized gas
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000002347 injection Methods 0.000 title claims abstract description 68
- 239000007924 injection Substances 0.000 title claims abstract description 68
- 238000004519 manufacturing process Methods 0.000 title description 5
- 239000011347 resin Substances 0.000 claims abstract description 41
- 229920005989 resin Polymers 0.000 claims abstract description 41
- 238000010438 heat treatment Methods 0.000 claims abstract description 17
- 238000000034 method Methods 0.000 claims description 13
- 239000007789 gas Substances 0.000 abstract description 89
- 238000001746 injection moulding Methods 0.000 abstract description 5
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 abstract description 3
- 229910001873 dinitrogen Inorganic materials 0.000 abstract description 3
- 229920001955 polyphenylene ether Polymers 0.000 abstract description 2
- 238000009413 insulation Methods 0.000 abstract 1
- 238000001816 cooling Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 238000007711 solidification Methods 0.000 description 2
- 230000008023 solidification Effects 0.000 description 2
- 238000004891 communication Methods 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 210000004894 snout Anatomy 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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)
- Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
Abstract
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。DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a method for injection molding a molded product with a beautiful appearance without sink marks or warpage. More specifically, the present invention relates to a method of manufacturing an injection molded product having a hollow structure by pressurizing a pressurized gas from inside the mold into a molten resin injected into the mold.
金型内に引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原動
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か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。2. Description of the Related Art A method for manufacturing a molded article having a hollow structure by pressurizing a pressurized gas into a molten resin drawn and injected into a mold is known. In this method, the molten resin in the mold is driven outward under the action of the pressure of the pressurized gas body inside it and is pressed against the mold surface, resulting in an accurate transfer of the mold shape. It is known that injection molded products can be obtained, and practical use is being attempted as a method for producing injection molded products with a beautiful appearance without sink marks or 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ャビティあるいは射出樹
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。In this method, there is a method in which the pressurized gas is injected from within the mold when the pressurized gas is injected into the molten resin, and the pressurized gas is press-fitted into the mold cavity or the injection resin flow path. This takes place via pressurized gas injection nozzles arranged in communication. Since the molten resin is injected into the mold under pressure, a filling pressure is generated when filling the mold.
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、溶融樹脂が金型キャビティに充填
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ｉ
こなり、加圧ガス体を圧入する事ができない場合がある
。This filling pressure causes the molten resin to reach the pressurized gas injection nozzle disposed within the mold, where there is an extremely high risk that the resin will transfer heat to the nozzle and the mold, and be cooled and solidified. The pressurized gas body is injected into the molten resin through the injection nozzle after or while the molten resin is being filled into the mold cavity, so when the resin that flows back into the injection nozzle solidifies, it is injected. The nozzle is blocked i
This may prevent the pressurized gas from being injected.
〔発明が解決しようとする問題点とその手段〕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
ｆｇ敵樹脂内部への円滑な圧入を実現することを目的と
する。[Problems to be Solved by the Invention and Means for Solving the Problems] The present invention aims to solve the above-mentioned deficiencies of the prior art. The purpose is to prevent clogging of the injection nozzle due to backflow and to realize smooth pressurization of the pressurized gas into the 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, the present invention uses a pressurized gas injection nozzle to pressurize a pressurized gas into the inside of the molten resin injected into the mold, thereby manufacturing an injection molded product having a hollow structure. For this purpose, a check valve is installed at the tip of the gas injection hole of the pressurized gas injection nozzle, and the nozzle tip including the check valve part is heated with a separately set heating device to cool the area near the check valve. The present invention relates to an injection molding method characterized by preventing resin 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 mentioned above, in the method of injecting a pressurized gas into the inside of the molten resin injected into the mold from inside the mold using a pressurized gas injection nozzle, the filling pressure inside the mold causes the melt to melt. There is a risk that the resin will reach the pressurized gas injection nozzle and the resin that has cooled and solidified will block the gas flow path.In the present invention, a check valve is installed in the gas injection hole to prevent the backflow of molten resin to 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ャ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, the check valve in the pressurized gas injection nozzle is located at the gas injection hole of the pressurized gas injection nozzle, that is, at the end of the injection nozzle, close to the mold cavity or resin flow path. It should be. Gas injection holes are usually
It consists of an opening for gas discharge provided at the tip of the injection nozzle and a piping system connected to the opening, and a 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 above-mentioned check valve prevents the molten resin from flowing back into the pressurized gas injection nozzle, depending on the shape of the molded product and mold, the type of resin, molding conditions, etc., heat may pass through the nozzle and reach the mold. As a result, the molten resin cools near the check valve, which increases viscosity and obstructs gas inflow, solidifies the gas injection hole, and causes gas to leak between the mold surface and the molded product surface. Problems such as leakage of information may occur. In the present invention, in order to eliminate such inconvenience and smoothly inject the pressurized gas into the molten resin in the mold, the nozzle tip including the check valve portion is heated with a separately provided heating device.
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。Examples of the heating device used in the method of the present invention include devices that supply heat by electrothermal heating, infrared heating, or dielectric heating. These electric heaters,
A heating device composed of an infrared heater or a dielectric heater is installed to heat and keep warm the tip of a pressurized gas injection nozzle provided with a check valve.
金型内へ射出注入された溶融樹脂は、金型キャビティを
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 into the mold fills the mold cavity and is also distributed inside the tip of the gas injection hole provided with the check valve, but according to the method of the present invention, By heating the tip of the gas injection hole, cooling of the molten resin flowing back into the gas injection hole is suppressed, and clogging of the gas flow path due to solidification of the resin is delayed. The pressurized gas is forced into the molten resin in the mold through the heat-insulated check valve and before the gas flow path is closed by solidification, forming a molded body with the desired hollow structure. . In other words, heating with a heating device,
In the vicinity of the gas injection hole where the resin is kept warm, the resin is kept in a high temperature molten state or is kept warm to the extent that it is easily deformed by the pressure of the pressurized gas body, and by conducting the pressurized gas to the pressurized gas injection nozzle, The pressurized gas is smoothly injected 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、中空構造部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 injection nozzle of the present invention is used to pressurize the pressurized gas body from the mold into the molten resin in the mold, and the molded body formed into the desired shape is press-fitted into the hollow structure. The molded product is cooled while maintaining the pressure effect of the pressurized gas body in the hollow structure, and when cooling is completed, it is taken out of the mold, but the pressure of the pressurized gas body remaining in the hollow structure is In order to prevent the molded product from deforming due to
Prior to opening the mold, the pressurized gas injection nozzle is moved, for example, by reciprocating motion to release the pressurized state in the hollow structure. It is practical because it prevents the gas injection hole from clogging.
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、金型キャビ
ティ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 a check valve is disposed at the tip of the gas injection hole and the tip of the gas injection hole is heated with a separately provided heating device, the pressurized gas injection nozzle can be heated. There is no blockage of the gas flow path due to the backflow of resin, and the pressurized gas can be smoothly injected into the molten resin in the mold cavity, and the desired hollow structure can be achieved in a stable and continuous cycle. Enables molded products to be injection molded.
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 figures.
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（１６）を持ち、ノズルの先端部にはガス流路（１
６）内に逆止弁（１１）が配設されたガス体注入孔（１
２）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
金型キャビティ内に向けて開口し、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、樹脂がキャビテ
ィ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 reciprocated by being driven by a cylinder (not shown) was provided on the movable mold (1) side of the mold. This nozzle has a gas pressurized introduction piston (
The tip of the nozzle has a gas flow path (16) that leads to a gas conduit (6) connected to the gas flow path (16).
6) A gas injection hole (1) in which a check valve (11) is installed.
2) was established. An electric ring heater (16) was provided on the outer periphery of the tip of the gas injection nozzle (5) including a check valve. The gas injection hole (12) at the tip of the gas injection nozzle opens into the mold cavity, and the nozzle body around the opening comes into close contact with the mold during molding, causing the resin to fill the cavity or the gas injection hole. The fixed type (2) was designed to prevent water from flowing out.
変性ポリフェニレンエーテル樹脂（三菱瓦斯化学株式会
社製、商品名「ユビエース ＡＮ３０」を射出成形機シ
リンダー（３）内で樹吻温度２７０℃に溶融、可塑化し
、射出圧カフ５０Ｋｑ／−にて前記金型キャビティ（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１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１００陽／−の圧縮窒素ガスをピス
トン−）で圧入した。A modified polyphenylene ether resin (manufactured by Mitsubishi Gas Chemical Co., Ltd., trade name ``UBYACE AN30'') was melted and plasticized at a snout temperature of 270°C in the cylinder (3) of an injection molding machine, and then molded into the mold at an injection pressure cuff of 50 Kq/-. Cavity (4
) was injected and injected. The tip of the gas injection nozzle was heated and kept warm at 280°C by a ring heater (16). One injection operation was stopped 3.5 seconds after the start of injection, and at the same time, 100 yen/- of compressed nitrogen gas was injected from the pressurized gas injection nozzle with a gas metering cylinder (8) using a piston.
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 compressed gas was injected smoothly into the resin, indicating that the gas injection hole, including the check valve, was kept sufficiently warm. I understand.
得られた成形品には、厚肉部にＭ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 with an M hole formed in the thick wall part, had no sink marks or 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 no ring heater was installed at the tip of the gas injection nozzle containing the check valve (11).
圧縮？素ガスのキャビティ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。compression? It was observed that the raw gas was not being pressurized into the cavity, so after the mold had cooled, the pressurized gas injection nozzle was examined and found that although the resin was prevented from flowing back by the check valve, it had solidified. It was found that the gas injection hole was blocked.
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。The molded product obtained had sink marks in the thick wall portion and was warped, but this was the result of an unsuccessful injection of compressed gas.
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
４：成形品キャビティ ５：ガス体注入ノズル：ガス体
供給管
：ガス体導通管 ７
：ガス計量シリンダー
：ガス加圧導入ピストン
：制御弁 １１：逆止弁
：ガス体注入孔 １３：ガス体流路
：チエツク弁 １５：窒素ガスボンベ：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 part A in FIG. 1: Movable type 2: Fixed type 3: Injection molding machine cylinder 4: Molded product cavity 5: Gas injection nozzle: Gas body supply pipe: Gas body conduction pipe 7: Gas measuring cylinder: Gas pressurization introduction piston: Control valve 11 : Check valve: Gas injection hole 13: Gas flow path: Check valve 15: Nitrogen gas cylinder: Ring heater
Claims (1)
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。 ２ 電熱器で構成されている加熱装置を用いる特許請求
の範囲第１項記載の方法。 ３ 赤外線加熱器で構成されている加熱装置を用いる特
許請求の範囲第１項記載の方法。４ 誘電加熱器で構成
されている加熱装置を用いる特許請求の範囲第１項記載
の方法。[Claims] 1. Pressurized gas is injected into the inside of the molten resin injected into the mold from inside the mold using a pressurized gas injection nozzle,
When producing an injection molded product having a hollow structure, a check valve is provided at the tip of the gas injection hole of the pressurized gas injection nozzle, and the nozzle tip including the check valve portion is heated by a heating device. A method characterized by: 2. The method according to claim 1, which uses a heating device constituted by an electric heater. 3. The method according to claim 1, which uses a heating device comprising an infrared heater. 4. The method according to claim 1, which uses a heating device comprising a dielectric heater.
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 true JPH0431015A (en) | 1992-02-03 |
| JP2949779B2 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) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0627292A1 (en) | 1993-06-02 | 1994-12-07 | Mitsubishi Gas Chemical Company, Inc. | Gas-feeding device for injection molding |
| US5465908A (en) * | 1993-03-05 | 1995-11-14 | Mitsubishi Gas Chemical Company, Inc. | Gas-feeding nozzle |
| US5626815A (en) * | 1993-11-15 | 1997-05-06 | Mitsubishi Gas Chemical Company, Inc. | Gas-feeding nozzle and apparatus and method employing such nozzle |
-
1990
- 1990-05-29 JP JP13699890A patent/JP2949779B2/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5465908A (en) * | 1993-03-05 | 1995-11-14 | Mitsubishi Gas Chemical Company, Inc. | Gas-feeding nozzle |
| EP0627292A1 (en) | 1993-06-02 | 1994-12-07 | Mitsubishi Gas Chemical Company, Inc. | Gas-feeding device for injection molding |
| US5626815A (en) * | 1993-11-15 | 1997-05-06 | Mitsubishi Gas Chemical Company, Inc. | Gas-feeding nozzle and apparatus and method employing such nozzle |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2949779B2 (en) | 1999-09-20 |
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