JPH10113945A - Device for sealing nitrogen gas for injection molding machine - Google Patents
Device for sealing nitrogen gas for injection molding machineInfo
- Publication number
- JPH10113945A JPH10113945A JP26883396A JP26883396A JPH10113945A JP H10113945 A JPH10113945 A JP H10113945A JP 26883396 A JP26883396 A JP 26883396A JP 26883396 A JP26883396 A JP 26883396A JP H10113945 A JPH10113945 A JP H10113945A
- Authority
- JP
- Japan
- Prior art keywords
- nitrogen gas
- molding machine
- injection molding
- injection cylinder
- nitrogen
- 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
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、スクリュー式射出
成形機の射出シリンダ内に窒素ガスを封入し、射出シリ
ンダ内の気体を窒素ガスに置換する、射出成形機用窒素
ガス封入装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a nitrogen gas filling apparatus for an injection molding machine, which fills an injection cylinder of a screw type injection molding machine with nitrogen gas and replaces the gas in the injection cylinder with nitrogen gas.
【０００２】[0002]
【従来の技術】スクリュー式射出成形機（以下、成型機
と略称する。）は、円筒状をなす射出シリンダ内に、螺
旋状をなすスクリュを同軸をなすよう挿通し、原料樹脂
を射出シリンダ内にて加熱溶融後、スクリュを前進さ
せ、射出シリンダの先端に形成されたノズルを介して溶
融樹脂を金型内に射出することにより、成形を行うもの
である。2. Description of the Related Art A screw type injection molding machine (hereinafter abbreviated as a molding machine) inserts a spiral screw coaxially into a cylindrical injection cylinder, and feeds raw material resin into the injection cylinder. After heating and melting at, the screw is moved forward, and the molten resin is injected into the mold through a nozzle formed at the tip of the injection cylinder to perform molding.
【０００３】[0003]
【発明が解決しようとする課題】ところで、上記成型機
の場合、射出シリンダ内の溶融樹脂が炭化して射出シリ
ンダやスクリュに付着し、この炭化樹脂が成形中に剥離
して成型品内に混入する結果、成型品が「焼け」を起こ
す場合がある。また、樹脂が炭化する原因としては、射
出シリンダ内における樹脂の滞留時間が長く、樹脂が熱
履歴を多く受けすぎる結果、樹脂性状が変化し、炭化に
至ると考えられる。By the way, in the case of the above molding machine, the molten resin in the injection cylinder is carbonized and adheres to the injection cylinder and the screw, and this carbonized resin is separated during molding and mixed into the molded product. As a result, the molded product may cause "burn". The cause of the carbonization of the resin is considered to be that the residence time of the resin in the injection cylinder is long and the resin receives too much heat history, resulting in a change in the resin properties and carbonization.
【０００４】一方、炭化樹脂としては、完全に炭化した
ものの他、樹脂中の有機ガスや空気等の気体を含むもの
があり、特に、後者は射出シリンダやスクリュに付着し
やすいため、「焼け」の原因となりやすい。そこで、射
出シリンダ内に窒素ガス等の不活性ガスを封入し、射出
シリンダ内の気体を不活性ガスに置換することにより、
炭化樹脂の発生を防止する方法が考案されている。On the other hand, carbonized resins include those completely carbonized and those containing gases such as organic gas and air in the resin. In particular, the latter easily adheres to an injection cylinder or a screw, so that "burning" occurs. Easy to cause. Therefore, by filling an inert gas such as nitrogen gas in the injection cylinder, and replacing the gas in the injection cylinder with an inert gas,
Methods for preventing the generation of carbonized resin have been devised.
【０００５】しかしながら、これらの方法は、いずれも
不活性ガスの封入方法及び封入タイミングに関するもの
で、不活性ガスの供給については、ボンベや圧力吸着法
によると開示されているのみであり、不活性ガス供給装
置の構成を具体的に示した例はない。本発明は上記事情
に鑑みてなされたもので、空気から直接窒素ガスを得る
ことが可能で、かつ封入時の窒素ガスの濃度及び流量を
調節可能な、射出成形機用窒素ガス封入装置（以下、封
入装置と略称する。）の提供をその目的としている。However, these methods all relate to the method and timing of filling the inert gas, and the supply of the inert gas is disclosed only by a cylinder or a pressure adsorption method. There is no specific example of the configuration of the gas supply device. The present invention has been made in view of the above circumstances, and it is possible to obtain nitrogen gas directly from air, and to adjust the concentration and flow rate of nitrogen gas at the time of filling, a nitrogen gas filling device for an injection molding machine (hereinafter referred to as a nitrogen gas filling device). , An enclosing device).
【０００６】[0006]
【課題を解決するための手段】本発明は、成形機の射出
シリンダ内に窒素ガスを封入して前記射出シリンダ内の
気体を窒素ガスに置換する封入装置であって、圧縮空気
を、酸素や水蒸気等が透過しやすい膜体を介して窒素と
酸素とに分離する分離手段を設け、この分離手段にて得
た窒素ガスを、前記射出シリンダ内に封入することをそ
の特徴としている。SUMMARY OF THE INVENTION The present invention is a sealing device for sealing a nitrogen gas into an injection cylinder of a molding machine and replacing the gas in the injection cylinder with a nitrogen gas. Separation means for separating into nitrogen and oxygen through a film body through which water vapor or the like easily permeates is provided, and nitrogen gas obtained by this separation means is sealed in the injection cylinder.
【０００７】この場合、前記分離手段を複数用意し、か
つこれら分離手段に圧縮空気を供給する流路に、窒素ガ
スの分離に使用される前記分離手段の数を切り換える切
換弁を設けることが望ましい。具体的には、前記流路内
に直列または並列に配設された前記分離手段のうち、特
定の前記分離手段への気体の供給を前記切換弁にて阻止
することにより、窒素ガスの分離に使用される前記分離
手段の数を切り換え可能である。In this case, it is desirable to prepare a plurality of the separating means and to provide a switching valve for switching the number of the separating means used for separating the nitrogen gas in a flow path for supplying the compressed air to the separating means. . Specifically, of the separation means arranged in series or in parallel in the flow path, the supply of gas to the specific separation means is blocked by the switching valve, thereby enabling separation of nitrogen gas. The number of said separating means used can be switched.
【０００８】一方、前記膜体としては、管状をなすポリ
イミド製の中空糸膜を用い、この中空糸膜内に圧縮空気
を通過させて酸素や水蒸気等を膜体外に透過させ、膜体
内に残留した窒素ガスを、封入用窒素ガスとして回収す
ることが望ましい。On the other hand, a hollow fiber membrane made of polyimide is used as the membrane, and compressed air is passed through the hollow fiber membrane to allow oxygen, water vapor, etc. to permeate out of the membrane and remain in the membrane. It is desirable that the recovered nitrogen gas be recovered as nitrogen gas for filling.
【０００９】[0009]
【発明の実施の形態】以下、図面に基づき、本発明の具
体的な実施形態について更に詳しく説明する。本発明に
係る封入装置の例を図１に示す。符合１は射出シリンダ
で、この射出シリンダ１は円筒状をなし、その先端に
は、成型時に金型（図示せず。）に連結されるノズル２
が形成され、かつ射出シリンダ１の周囲には、ヒータ３
が配設されている。DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, specific embodiments of the present invention will be described in more detail with reference to the drawings. FIG. 1 shows an example of the sealing device according to the present invention. Reference numeral 1 denotes an injection cylinder. The injection cylinder 1 has a cylindrical shape, and has a nozzle 2 connected to a die (not shown) at the time of molding.
Are formed, and a heater 3 is provided around the injection cylinder 1.
Are arranged.
【００１０】符合４は螺旋状をなすスクリュで、このス
クリュ４は、射出シリンダ１内に、基端側から射出シリ
ンダ１と同軸をなすよう挿通され、かつ射出シリンダ１
の軸方向に沿って前進後退可能とされている。また、射
出シリンダ１の側面には、温度測定用の熱電対５が埋設
され、かつこの熱電対５は、温度検知器６に接続されて
いる。Reference numeral 4 denotes a spiral screw. The screw 4 is inserted into the injection cylinder 1 so as to be coaxial with the injection cylinder 1 from the base end side.
Can be moved forward and backward along the axial direction. A thermocouple 5 for temperature measurement is embedded on a side surface of the injection cylinder 1, and the thermocouple 5 is connected to a temperature detector 6.
【００１１】符合７は射出シリンダ１の基端側に設けら
れた樹脂投入口で、この樹脂投入口７と原料樹脂貯留用
のホッパ８との間には、円管状をなすブラケット９が、
樹脂投入口７及びホッパ８と同軸をなすよう介在されて
いる。また、樹脂投入口７及びホッパ８とブラケット９
との間は、いずれも封止シート１０により気密的に封止
されている。Reference numeral 7 denotes a resin input port provided on the base end side of the injection cylinder 1. Between the resin input port 7 and a hopper 8 for storing raw material resin, a bracket 9 having a tubular shape is provided.
It is interposed coaxially with the resin inlet 7 and the hopper 8. Also, the resin inlet 7 and the hopper 8 and the bracket 9
Are hermetically sealed by the sealing sheet 10.
【００１２】符合１１は、封入窒素を放出するための窒
素放出管で、この窒素放出管１１は、ブラケット９の内
周面から径方向内方に突出し、かつその先端は、ブラケ
ット９の軸線上にて９０°屈曲して、樹脂投入口７側に
開口している。ここで、窒素放出管１１のサイズ及び位
置は、樹脂の落下や成形に悪影響を及ぼさないよう予め
設定されている。また、窒素放出管１１をブラケット９
の軸線上にて樹脂投入口７側に開口した理由は、窒素ガ
スを落下樹脂に対し均等に噴射し、かつ樹脂間隙に存在
する気体の窒素ガスへの置換を容易化するためである。
更に、樹脂の溶融に伴い発生するガスや熱による腐食等
の劣化を防止するため、ブラケット９及び窒素放出管１
１はいずれもＳＵＳ材製とされている。Reference numeral 11 denotes a nitrogen discharge tube for discharging the sealed nitrogen. The nitrogen discharge tube 11 protrudes radially inward from the inner peripheral surface of the bracket 9, and its tip is located on the axis of the bracket 9. At 90 ° to open the resin inlet 7 side. Here, the size and position of the nitrogen release tube 11 are set in advance so as not to adversely affect the resin falling or molding. Also, the nitrogen discharge pipe 11 is connected to the bracket 9.
The reason for opening the resin inlet 7 side on the axis of is to inject nitrogen gas evenly to the falling resin and to facilitate replacement of the gas present in the resin gap with nitrogen gas.
Further, in order to prevent deterioration such as corrosion due to gas or heat generated when the resin is melted, the bracket 9 and the nitrogen discharge tube 1 are used.
1 are all made of SUS material.
【００１３】一方、窒素放出管１１の基端側は、接続ホ
ース１２を介して封入装置本体（後述）に接続されてい
る。また、符合１３は、接続ホース１２の途中に設けら
れ、温度検知器６からの信号に応じ、自動的に接続ホー
ス１２を開閉する電磁開閉弁である。On the other hand, the base end of the nitrogen discharge tube 11 is connected to a sealing device main body (described later) via a connection hose 12. Reference numeral 13 denotes an electromagnetic on-off valve that is provided in the middle of the connection hose 12 and automatically opens and closes the connection hose 12 according to a signal from the temperature detector 6.
【００１４】符合１４は圧縮空気供給口で、圧縮空気供
給口１４から窒素ガス分離器（分離手段）１５に至る流
路１６には、上流側から、エアフィルタ１７、ミストフ
ィルタ１８、及びレギュレータ１９が直列に配設され、
これらエアフィルタ１７ないしレギュレータ１９によ
り、窒素ガス分離器１５への不純物の混入及び窒素ガス
分離器１５の破損を防止している。Reference numeral 14 denotes a compressed air supply port, and an air filter 17, a mist filter 18, and a regulator 19 are provided in the flow path 16 from the compressed air supply port 14 to the nitrogen gas separator (separating means) 15 from the upstream side. Are arranged in series,
The air filter 17 and the regulator 19 prevent impurities from being mixed into the nitrogen gas separator 15 and damage to the nitrogen gas separator 15.
【００１５】ここで、窒素ガス分離器１５は、管状をな
すポリイミド製の中空糸膜（膜体）を備え、この中空糸
膜内に圧縮空気を通過させて酸素や水蒸気等を中空糸膜
外に透過、排除することにより、膜内に残留した窒素ガ
スを、封入用窒素ガスとして回収するものである。図１
の場合、２個の窒素ガス分離器１５が、流路１６内に直
列に配設されている。Here, the nitrogen gas separator 15 is provided with a hollow polyimide fiber membrane (membrane body) that forms a tube. Compressed air is passed through the hollow fiber membrane to remove oxygen, water vapor, etc. from the outside of the hollow fiber membrane. The nitrogen gas remaining in the film is recovered as a nitrogen gas for encapsulation by permeating and excluding it. FIG.
In this case, two nitrogen gas separators 15 are arranged in series in the flow path 16.
【００１６】符合２０は、上記２個の窒素ガス分離器１
５間に配設された電磁切換弁（切換弁）で、この電磁切
換弁２０は、上流側の窒素ガス分離器１５にて回収され
た気体（窒素ガスが富化された圧縮空気）の供給先を、
下流側の窒素ガス分離器１５か、あるいはこれら窒素ガ
ス分離器１５から接続ホース１２に至る流路１６のいず
れかに切り換えるものである。Reference numeral 20 denotes the two nitrogen gas separators 1
The solenoid-operated switching valve (switching valve) is provided between the first and second solenoid valves 5 and supplies the gas (compressed air enriched with nitrogen gas) collected by the nitrogen gas separator 15 on the upstream side. Ahead
The switching is made to either the nitrogen gas separator 15 on the downstream side or the flow path 16 from the nitrogen gas separator 15 to the connection hose 12.
【００１７】すなわち、電磁切換弁２０を切換え、これ
ら窒素ガス分離器１５の双方に圧縮空気を連続して通過
させるか、下流側の窒素ガス分離器１５への流路を遮断
し、上流側の窒素ガス分離器１５にのみ圧縮空気を通過
させるか選択することにより、排出される窒素ガスの濃
度や流量の変更が可能となっている。また、図１の場
合、下流側の窒素ガス分離器１５における吸入側及び排
出側の流路１６が隣接して設けられており、その結果、
電磁切換弁２０を上記吸入側及び排出側の流路１６にま
たがって配設することにより、１つの電磁切換弁２０に
て、下流側の窒素ガス分離器１５における吸入側及び排
出側の流路１６の双方を同時に遮断することが可能とな
っている。That is, the electromagnetic switching valve 20 is switched so that the compressed air continuously passes through both of the nitrogen gas separators 15 or the flow path to the nitrogen gas separator 15 on the downstream side is shut off, and By selecting whether to allow compressed air to pass through only the nitrogen gas separator 15, it is possible to change the concentration and flow rate of the discharged nitrogen gas. In the case of FIG. 1, the flow paths 16 on the suction side and the discharge side of the nitrogen gas separator 15 on the downstream side are provided adjacent to each other.
By disposing the electromagnetic switching valve 20 over the suction-side and discharge-side flow paths 16, the suction-side and discharge-side flow paths in the nitrogen gas separator 15 on the downstream side can be controlled by one electromagnetic switching valve 20. 16 can be cut off at the same time.
【００１８】符合２１は、窒素ガス分離器１５の上流側
及び下流側にそれぞれ設置された圧力計で、この圧力計
２１は、酸素除去前後の流路１６内の差圧を検出し、中
空糸膜の性能劣化を判断するためのものである。また、
符合２２は、窒素ガス分離器１５から接続ホース１２に
至る流路１６内に配設され、流路１６からの窒素ガス供
給量を調整する浮遊式流量計である。そして、これら流
路１６から浮遊式流量計２２に至る部材により、封入装
置本体２３が概略構成されている。Reference numeral 21 denotes pressure gauges installed on the upstream side and the downstream side of the nitrogen gas separator 15, respectively. The pressure gauge 21 detects a differential pressure in the flow path 16 before and after oxygen removal, and detects a hollow fiber. This is for determining the performance degradation of the film. Also,
Reference numeral 22 denotes a floating flow meter that is provided in the flow path 16 from the nitrogen gas separator 15 to the connection hose 12, and adjusts the amount of nitrogen gas supplied from the flow path 16. The sealing device main body 23 is schematically constituted by members from the flow path 16 to the floating type flow meter 22.
【００１９】次ぎに、上記構成を有する封入装置による
射出シリンダ１内への窒素ガスの封入及び窒素ガスの封
入停止について、図２に示すシーケンスチャートととも
に以下に説明する。Next, the charging of the nitrogen gas into the injection cylinder 1 and the stop of the charging of the nitrogen gas by the charging device having the above configuration will be described below with reference to a sequence chart shown in FIG.
【００２０】まず、窒素ガスの封入は、樹脂の溶融前、
すなわち射出シリンダ１内の温度上昇時に行われるが、
その手順は以下の通りである。 熱電対５より温度検知器６が受けた温度信号（窒素ガ
ス停止温度、設定温度ａ）Ｒ0により、窒素ガス停止信
号リレーＲ3が励磁される。 射出シリンダ１内の温度が上昇し、中間温度（設定温
度ｂ）を越えると、温度信号Ｒ1が発せられ、温度変化
確認信号リレーＲ4が励磁される。また、Ｒ3，Ｒ4の励
磁により温度上昇が確認されると、温度上昇・下降確認
信号リレーＲ6が励磁され、初期状態に戻る（リセット
される）。 射出シリンダ１内の温度上昇が更に上昇し、窒素ガス
封入温度（設定温度ｃ）を越えると、温度信号Ｒ2が発
せられ、窒素ガス封入信号リレーＲ5が励磁される。 その結果、電磁開閉弁１３が開状態となり、窒素ガス
の封入が開始される。First, nitrogen gas is sealed before the resin is melted.
That is, it is performed when the temperature in the injection cylinder 1 rises,
The procedure is as follows. The temperature signal (nitrogen gas stop temperature, set temperature a) R 0 received by the temperature detector 6 from the thermocouple 5 excites the nitrogen gas stop signal relay R 3 . Elevated temperature in the injection cylinder 1, exceeds the intermediate temperature (set temperature b), the temperature signal R 1 is issued, the temperature change confirmation signal relay R 4 is energized. When the temperature rise is confirmed by the excitation of R 3 and R 4 , the temperature rise / fall confirmation signal relay R 6 is excited and returns to the initial state (reset). Temperature rise in the injection cylinder 1 is increased further and exceeds the nitrogen gas enclosure temperature (set temperature c), the temperature signal R 2 is issued, the nitrogen gas enclosure signal relay R 5 is energized. As a result, the electromagnetic on-off valve 13 is opened, and the filling of the nitrogen gas is started.
【００２１】一方、窒素ガスの封入停止は、樹脂の硬化
後、すなわち射出シリンダ１内の温度下降時に行われる
が、その工程は以下の通りである。 射出シリンダ１内の温度が中間温度（設定温度ｂ）よ
り下がると、温度信号Ｒ 1が発せられ、温度変化確認信
号リレーＲ4が励磁される。 射出シリンダ１内の温度が更に下降し、窒素ガス停止
温度（設定温度ａ）より下がると、温度信号Ｒ0が発せ
られ、窒素ガス停止信号リレーＲ3が励磁される。 Ｒ3，Ｒ4の励磁により温度下降が確認されると、温度
上昇・下降確認信号リレーＲ6が励磁され、初期状態に
戻る。 その結果、電磁開閉弁１３が閉状態となり、窒素ガス
の封入が停止される。On the other hand, stopping the filling of the nitrogen gas is equivalent to the curing of the resin.
This is performed later, that is, when the temperature in the injection cylinder 1 decreases.
However, the steps are as follows. The temperature in the injection cylinder 1 is higher than the intermediate temperature (set temperature b).
The temperature signal R 1Is issued and the temperature change confirmation
No. relay RFourIs excited. The temperature inside the injection cylinder 1 drops further and the nitrogen gas stops.
When the temperature falls below the temperature (set temperature a), the temperature signal R0Emits
And the nitrogen gas stop signal relay RThreeIs excited. RThree, RFourWhen the temperature decrease is confirmed by the excitation of
Rise / fall confirmation signal relay R6Is excited to the initial state
Return. As a result, the solenoid on-off valve 13 is closed and the nitrogen gas
Is stopped.
【００２２】すなわち、本発明に係る封入装置の場合、
射出シリンダ１内への窒素ガスの封入及び窒素ガスの封
入停止は、射出シリンダ１内の温度を熱電対５にて検知
し、その検知結果に基づき、温度検知器６が、上記手順
に基づき電磁開閉弁１３を開閉させることにより行われ
る。また、温度検知器６における設定温度ａ,ｂ，ｃの
設定値を変えることにより、封入開始及び停止のタイミ
ングを任意に設定可能である。That is, in the case of the sealing device according to the present invention,
The charging of the nitrogen gas into the injection cylinder 1 and the stop of the charging of the nitrogen gas are performed by detecting the temperature in the injection cylinder 1 with the thermocouple 5, and based on the detection result, the temperature detector 6 sets the electromagnetic sensor based on the above procedure. This is performed by opening and closing the on-off valve 13. Further, by changing the set values of the set temperatures a, b, and c in the temperature detector 6, it is possible to arbitrarily set the timing of starting and stopping the enclosing.
【００２３】このように、本発明に係る封入装置によれ
ば、射出シリンダ１内に窒素ガス等を封入し、射出シリ
ンダ１内の気体を窒素ガスに置換することにより、成形
品の「焼け」の原因となる炭化樹脂の発生を防止するこ
とができる。また、本発明に係る封入装置によれば、空
気から直接かつ容易に窒素ガスを得ることが可能である
ため、窒素ガスの獲得に要するコストが軽減される。更
に、窒素ガス分離器１５に圧縮空気を通過させるだけで
窒素ガスが分離されるため、窒素ガス分離用に新たな電
源等を設ける必要もなく、電力消費が少なくて済む。As described above, according to the sealing device of the present invention, nitrogen gas or the like is sealed in the injection cylinder 1 and the gas in the injection cylinder 1 is replaced with nitrogen gas, thereby "burning" the molded product. Can be prevented from being generated. Further, according to the sealing device of the present invention, it is possible to directly and easily obtain nitrogen gas from air, so that the cost required for obtaining nitrogen gas is reduced. Furthermore, since nitrogen gas is separated only by passing compressed air through the nitrogen gas separator 15, there is no need to provide a new power supply or the like for nitrogen gas separation, and power consumption can be reduced.
【００２４】また、成形品の大きさ、種類等、成形条
件、更には成型時におけるガスの発生状況によっては、
封入される窒素ガスの濃度及び封入量を変化させる必要
があるが、本発明に係る封入装置の場合、封入装置本体
２３内に複数の窒素ガス分離器１５を備え、かつ窒素ガ
スの分離に使用される窒素ガス分離器１５の数を電磁切
換弁２０にて切り換えることにより、排出される窒素ガ
スの濃度や流量が調節可能となっている。すなわち、本
発明に係る封入装置によれば、同一の封入装置で、封入
される窒素ガスの濃度及び封入量の変化に対応すること
が可能となり、使用上の自由度が増す。In addition, depending on the molding conditions such as the size and type of the molded product, and also on the state of gas generation during molding,
It is necessary to change the concentration and amount of nitrogen gas to be sealed. In the case of the sealing device according to the present invention, a plurality of nitrogen gas separators 15 are provided in the sealing device main body 23 and used for separating nitrogen gas. By switching the number of nitrogen gas separators 15 to be operated by the electromagnetic switching valve 20, the concentration and flow rate of the discharged nitrogen gas can be adjusted. That is, according to the enclosing device according to the present invention, it is possible to cope with changes in the concentration of the nitrogen gas to be enclosed and the amount of the enclosed gas with the same enclosing device, and the degree of freedom in use increases.
【００２５】一方、図３に示すように、複数（図では２
個）の窒素ガス分離器１５を流路１６内に並列に配設
し、これら窒素ガス分離器１５に向かう流路１６の分岐
点に電磁切換弁２０を配設してもよい。この場合、磁切
換弁２０を切換え、これら窒素ガス分離器１５の双方に
圧縮空気を並行して通過させるか、図中右側の窒素ガス
分離器１５への流路を遮断し、図中左側の窒素ガス分離
器１５にのみ圧縮空気を通過させるか選択することによ
り、排出される窒素ガスの濃度や流量の変更が可能とな
る。On the other hand, as shown in FIG.
The nitrogen gas separators 15 may be disposed in parallel in the flow path 16, and the electromagnetic switching valve 20 may be disposed at a branch point of the flow path 16 toward the nitrogen gas separator 15. In this case, the magnetic switching valve 20 is switched to allow the compressed air to pass through both of the nitrogen gas separators 15 in parallel, or the flow path to the nitrogen gas separator 15 on the right side in the figure is shut off, and By selecting whether to allow compressed air to pass through only the nitrogen gas separator 15, it is possible to change the concentration and flow rate of the discharged nitrogen gas.
【００２６】[0026]
【発明の効果】以上説明した通り、本発明に係る封入装
置によれば、射出シリンダ内に窒素ガス等を封入し、射
出シリンダ内の気体を窒素ガスに置換することにより、
成形品の「焼け」の原因となる炭化樹脂の発生を防止す
ることができる。また、空気から直接かつ容易に窒素ガ
スを得ることが可能であるため、窒素ガスの獲得に要す
るコストが軽減される。更に、分離手段に圧縮空気を通
過させるだけで窒素ガスが分離されるため、窒素ガス分
離用に新たな電源等を設ける必要もなく、電力消費が少
なくて済む。As described above, according to the sealing apparatus of the present invention, nitrogen gas or the like is sealed in the injection cylinder, and the gas in the injection cylinder is replaced with nitrogen gas.
It is possible to prevent the generation of carbonized resin which causes "burn" of the molded article. Further, since the nitrogen gas can be obtained directly and easily from the air, the cost required for obtaining the nitrogen gas is reduced. Furthermore, since nitrogen gas is separated only by passing compressed air through the separation means, there is no need to provide a new power supply or the like for nitrogen gas separation, and power consumption can be reduced.
【００２７】また、成形品の大きさ、種類等、成形条
件、更には成型時におけるガスの発生状況によっては、
封入される窒素ガスの濃度及び封入量を変化させる必要
があるが、本発明に係る封入装置の場合、複数の分離手
段を備え、かつ窒素ガスの分離に使用される分離手段の
数を切換弁にて切り換えることにより、排出される窒素
ガスの濃度や流量が調節可能となっている。すなわち、
本発明に係る封入装置によれば、同一の封入装置で、封
入される窒素ガスの濃度及び封入量の変化に対応するこ
とが可能となり、使用上の自由度が増す。Also, depending on the molding conditions such as the size and type of the molded product, and also on the state of gas generation during molding,
It is necessary to change the concentration and the amount of nitrogen gas to be sealed. , The concentration and flow rate of the discharged nitrogen gas can be adjusted. That is,
ADVANTAGE OF THE INVENTION According to the encapsulation apparatus which concerns on this invention, it becomes possible to respond | correspond to the change of the density | concentration of nitrogen gas and the amount of encapsulation with the same encapsulation apparatus, and the flexibility in use increases.
【図１】 本発明に係る窒素ガス封入装置の構造の例を
示す図である。FIG. 1 is a diagram showing an example of the structure of a nitrogen gas filling apparatus according to the present invention.
【図２】 本発明に係る窒素ガス封入装置による射出シ
リンダ内への窒素ガスの封入及び窒素ガスの封入停止の
手順を示すシーケンスチャートである。FIG. 2 is a sequence chart showing a procedure of charging nitrogen gas into an injection cylinder and stopping charging of the nitrogen gas by the nitrogen gas charging device according to the present invention.
【図３】 本発明に係る封入装置本体の構造の例を示す
図である。FIG. 3 is a diagram showing an example of the structure of a sealing device main body according to the present invention.
１ 射出シリンダ １５ 窒素ガス分離器（分離手段） １６ 流路 ２０ 電磁切換弁（切換弁） DESCRIPTION OF SYMBOLS 1 Injection cylinder 15 Nitrogen gas separator (separation means) 16 Flow path 20 Electromagnetic switching valve (switching valve)
Claims (5)
内に窒素ガスを封入して前記射出シリンダ内の気体を窒
素ガスに置換する、射出成形機用窒素ガス封入装置であ
って、 圧縮空気を、酸素が透過可能な膜体を介して窒素と酸素
とに分離する分離手段を設け、この分離手段にて得た窒
素ガスを、前記射出シリンダ内に封入することを特徴と
する射出成形機用窒素ガス封入装置。1. A nitrogen gas filling device for an injection molding machine, wherein a nitrogen gas is filled in an injection cylinder of a screw type injection molding machine and the gas in the injection cylinder is replaced with nitrogen gas. A separator for separating nitrogen and oxygen through a membrane through which oxygen can pass; and nitrogen gas obtained by the separator is sealed in the injection cylinder. Gas filling device.
分離手段に圧縮空気を供給する流路に、窒素ガスの分離
に使用される前記分離手段の数を切り換える切換弁を設
けたことを特徴とする請求項１記載の射出成形機用窒素
ガス封入装置。2. A method according to claim 1, wherein a plurality of said separating means are prepared, and a switching valve for switching the number of said separating means used for separating nitrogen gas is provided in a flow path for supplying compressed air to said separating means. The nitrogen gas filling apparatus for an injection molding machine according to claim 1, wherein
され、かつ特定の前記分離手段への気体の供給が、前記
切換弁により阻止可能とされていることを特徴とする請
求項２記載の射出成形機用窒素ガス封入装置。3. The apparatus according to claim 2, wherein said separation means is arranged in series in said flow path, and supply of gas to said specific separation means can be prevented by said switching valve. 3. The nitrogen gas filling device for an injection molding machine according to 2.
され、かつ特定の前記分離手段への気体の供給が、前記
切換弁により阻止可能とされていることを特徴とする請
求項２記載の射出成形機用窒素ガス封入装置。4. The apparatus according to claim 1, wherein said separation means is disposed in parallel in said flow path, and supply of gas to said specific separation means can be prevented by said switching valve. 3. The nitrogen gas filling device for an injection molding machine according to 2.
空糸膜とされ、この中空糸膜内に圧縮空気を通過させて
酸素や水蒸気等を膜体外に透過させ、膜体内に残留した
窒素ガスを、封入用窒素ガスとして回収することを特徴
とする請求項１ないし４のいずれか１項記載の射出成形
機用窒素ガス封入装置。5. The membrane body is a hollow fiber membrane made of polyimide having a tubular shape. Compressed air is passed through the hollow fiber membrane to allow oxygen and water vapor to permeate out of the membrane body, and nitrogen remaining in the membrane body. 5. The nitrogen gas filling apparatus for an injection molding machine according to claim 1, wherein the gas is recovered as a filling nitrogen gas.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP26883396A JP3216548B2 (en) | 1996-10-09 | 1996-10-09 | Nitrogen gas filling equipment for injection molding machines |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP26883396A JP3216548B2 (en) | 1996-10-09 | 1996-10-09 | Nitrogen gas filling equipment for injection molding machines |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH10113945A true JPH10113945A (en) | 1998-05-06 |
| JP3216548B2 JP3216548B2 (en) | 2001-10-09 |
Family
ID=17463905
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP26883396A Expired - Fee Related JP3216548B2 (en) | 1996-10-09 | 1996-10-09 | Nitrogen gas filling equipment for injection molding machines |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3216548B2 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004508970A (en) * | 2000-09-13 | 2004-03-25 | レール・リキード−ソシエテ・アノニム・ア・ディレクトワール・エ・コンセイユ・ドゥ・スールベイランス・プール・レテュード・エ・レクスプロワタシオン・デ・プロセデ・ジョルジュ・クロード | Molding equipment for plastic products under inert atmosphere |
| JP2008087449A (en) * | 2006-10-02 | 2008-04-17 | Fukuhara Co Ltd | Method and device for supplying nitrogen gas in resin molding machine |
| WO2009037859A1 (en) * | 2007-09-21 | 2009-03-26 | Mitsui Chemicals, Inc. | Flame-retardant polyamide composition |
| WO2009037858A1 (en) * | 2007-09-21 | 2009-03-26 | Mitsui Chemicals, Inc. | Flame-retardant polyamide composition |
-
1996
- 1996-10-09 JP JP26883396A patent/JP3216548B2/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004508970A (en) * | 2000-09-13 | 2004-03-25 | レール・リキード−ソシエテ・アノニム・ア・ディレクトワール・エ・コンセイユ・ドゥ・スールベイランス・プール・レテュード・エ・レクスプロワタシオン・デ・プロセデ・ジョルジュ・クロード | Molding equipment for plastic products under inert atmosphere |
| JP4786861B2 (en) * | 2000-09-13 | 2011-10-05 | レール・リキード−ソシエテ・アノニム・プール・レテュード・エ・レクスプロワタシオン・デ・プロセデ・ジョルジュ・クロード | Molding equipment for plastic products under inert atmosphere |
| JP2008087449A (en) * | 2006-10-02 | 2008-04-17 | Fukuhara Co Ltd | Method and device for supplying nitrogen gas in resin molding machine |
| WO2009037859A1 (en) * | 2007-09-21 | 2009-03-26 | Mitsui Chemicals, Inc. | Flame-retardant polyamide composition |
| WO2009037858A1 (en) * | 2007-09-21 | 2009-03-26 | Mitsui Chemicals, Inc. | Flame-retardant polyamide composition |
| JP5276000B2 (en) * | 2007-09-21 | 2013-08-28 | 三井化学株式会社 | Flame retardant polyamide composition |
| JP5275999B2 (en) * | 2007-09-21 | 2013-08-28 | 三井化学株式会社 | Flame retardant polyamide composition |
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| Publication number | Publication date |
|---|---|
| JP3216548B2 (en) | 2001-10-09 |
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