JP2704715B2 - Hollow injection molding method and apparatus - Google Patents
Hollow injection molding method and apparatusInfo
- Publication number
- JP2704715B2 JP2704715B2 JP34732795A JP34732795A JP2704715B2 JP 2704715 B2 JP2704715 B2 JP 2704715B2 JP 34732795 A JP34732795 A JP 34732795A JP 34732795 A JP34732795 A JP 34732795A JP 2704715 B2 JP2704715 B2 JP 2704715B2
- Authority
- JP
- Japan
- Prior art keywords
- gate
- mold
- resin
- synthetic resin
- injection molding
- 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 - Fee Related
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
- B29C45/1704—Introducing an auxiliary fluid into the mould the fluid being introduced into the interior of the injected material which is still in a molten state, e.g. for producing hollow articles
-
- 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
- B29C45/1704—Introducing an auxiliary fluid into the mould the fluid being introduced into the interior of the injected material which is still in a molten state, e.g. for producing hollow articles
- B29C2045/1718—Introducing an auxiliary fluid into the mould the fluid being introduced into the interior of the injected material which is still in a molten state, e.g. for producing hollow articles sealing or closing the fluid injection opening
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)
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、合成樹脂からなる
中空物の射出成形方法及びその装置に関し、特に金型
と、そのキャビティ部に溶融合成樹脂及びガスをランナ
ー及びゲートを経て圧入するノズルとを用いる中空物の
射出成形方法及びその装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for injection molding a hollow article made of a synthetic resin, and more particularly to a mold and a nozzle for press-fitting a molten synthetic resin and gas into a cavity thereof through a runner and a gate. TECHNICAL FIELD The present invention relates to a method and an apparatus for injection molding a hollow object using the same.
【０００２】[0002]
【従来の技術】従来、この種の中空物の射出成形方法及
び装置としては、ホットランナーを有する金型を用いた
中空射出成形方法において、金型のキャビティ内に溶融
合成樹脂を射出した後、加圧流体圧入・排出系に接続さ
れた加圧液体ノズルをホットランナー側からゲートに接
続し、キャビティ内の溶融合成樹脂中への加圧流体の圧
入・排出を加圧流体ノズルを介して行い、その後、加圧
流体ノズルのゲートへの接続を解除し、少量の溶融合成
樹脂を射出して成形品の加圧流体圧入孔を閉塞する方
法、及びホットランナーを有する金型に設けられる中空
射出成形用の加圧流体圧入・排出装置において、加圧流
体圧入・排出系に接続された加圧流体ノズルが、ホット
ランナー側からゲートに向って進退可能で、しかも前進
時に先端をゲートに接続可能に設けられている装置が知
られている（特開平７−１３７０８０号公報参照）。こ
の方法及び装置は、加圧流体の圧入と排出が、加圧流体
ノズルをゲートに接続することにより、ホットランナー
に加圧流体を通すことなく行われるので、加圧流体の圧
入と排出時に、ホットランナー内の溶融合成樹脂に加圧
流体が混ざる心配がなく、又、少量の溶融合成樹脂を再
射出するので、加圧流体の圧入によって形成される加圧
流体圧入孔を塞ぐことができる、というものである。2. Description of the Related Art Conventionally, as a method and an apparatus for injection molding a hollow object of this kind, in a hollow injection molding method using a mold having a hot runner, after injecting a molten synthetic resin into a cavity of the mold, The pressurized liquid nozzle connected to the pressurized fluid press-in / discharge system is connected to the gate from the hot runner side, and pressurized fluid is injected and discharged into the molten synthetic resin in the cavity through the pressurized fluid nozzle. Then, the connection of the pressurized fluid nozzle to the gate is released, a small amount of molten synthetic resin is injected to close the pressurized fluid press-in hole of the molded product, and the hollow injection provided in the mold having the hot runner In the pressurized fluid injection / discharge device for molding, the pressurized fluid nozzle connected to the pressurized fluid injection / discharge system can move forward and backward from the hot runner side toward the gate, and the tip of the nozzle moves forward. Device provided connection capable is known (see Japanese Patent Laid-Open No. 7-137080). In the method and the apparatus, the pressurized fluid is injected and discharged without connecting the pressurized fluid to the hot runner by connecting the pressurized fluid nozzle to the gate. There is no fear that the pressurized fluid mixes with the molten synthetic resin in the hot runner, and since a small amount of the molten synthetic resin is re-injected, the pressurized fluid press-in hole formed by press-in of the pressurized fluid can be closed. That is.
【０００３】[0003]
【発明が解決しようとする課題】しかしながら、従来の
中空物の射出成形方法及びその装置では、ホットランナ
ー方式のものしか適用できないので、使用範囲が限られ
てしまう不具合がある。又、加圧流体圧入孔を塞ぐ少量
の溶融合成樹脂を射出する際に、加圧流体ノズルがゲー
トから離れた状態で行われるので、ゲート樹脂を成形品
から分離する後加工処理工程が必要となる不具合があ
る。そこで、本発明は、ホットランナー方式のものに限
らず、コールドランナー方式のものにも適用し得、かつ
ゲート樹脂の後加工処理工程を不要とし得る中空物の射
出成形方法及びその装置を提供することを目的とする。However, in the conventional injection molding method and apparatus for hollow objects, only the hot runner method can be applied, and thus there is a problem that the range of use is limited. In addition, when injecting a small amount of molten synthetic resin that closes the pressurized fluid injection hole, the pressurized fluid nozzle is performed in a state away from the gate, so a post-processing process is required to separate the gate resin from the molded product. There is a problem. Accordingly, the present invention provides a method and an apparatus for injection molding a hollow object that can be applied not only to a hot runner type but also to a cold runner type and can eliminate the need for a post-processing step of a gate resin. The purpose is to:
【０００４】[0004]
【課題を解決するための手段】前記課題を解決するた
め、本発明の中空物の射出成形方法は、金型と、そのキ
ャビティ部に溶融合成樹脂及びガスをランナー及びゲー
トを経て圧入するノズルとを用いる中空物の射出成形方
法において、前記キャビティ部に未充填量の溶融合成樹
脂を射出した後、その溶融合成樹脂中に対するガスの圧
入、保圧及び放出をし、少なくともキャビテイ部内の合
成樹脂が冷却固化してから、ゲートランナーとの接続部
においてゲート内の合成樹脂と共に溶融状態に保持した
合成樹脂の一部をゲート内の全ての合成樹脂と共に成形
品のガス通過孔へ押し出してそのガス通過孔を閉塞する
ことを特徴とする。又、中空物の射出成形装置は、金型
と、そのキャビティ部に溶融合成樹脂及びガスをランナ
ー及びゲートを経て圧入するノズルとを有する中空物の
射出成形装置において、前記ゲートとランナーとの接続
部にゲートに連ねて設けた樹脂溜まりと、樹脂溜まりと
ゲートの周辺の金型に埋設したヒータと、樹脂溜まりに
連ねて金型に軸方向へ進退可能に設けられ、樹脂溜まり
を挿通してゲートに摺動可能に嵌合する棒状の樹脂押出
し部材と、樹脂押出し部材を進退駆動するため金型に設
けられた流体圧シリンダとを備えることを特徴とする。In order to solve the above-mentioned problems, a method for injection molding a hollow object according to the present invention comprises a mold and a nozzle for press-fitting a molten synthetic resin and gas into a cavity thereof through a runner and a gate. In the injection molding method of a hollow object using, after injecting an unfilled amount of molten synthetic resin into the cavity portion, press-fit, hold and release gas into the molten synthetic resin, at least the synthetic resin in the cavity portion is After cooling and solidifying, a part of the synthetic resin held in a molten state together with the synthetic resin in the gate at the connection with the gate runner is extruded together with all the synthetic resins in the gate into the gas passage hole of the molded product and the gas passes It is characterized by closing the hole. Further, an injection molding apparatus for a hollow object is an injection molding apparatus for a hollow object having a mold and a nozzle for press-fitting a molten synthetic resin and gas into a cavity portion thereof through a runner and a gate. A resin reservoir provided in connection with the gate, a heater buried in the mold around the resin reservoir and the gate, and a resin reservoir connected to the resin reservoir so as to be able to advance and retreat in the axial direction. It is characterized by comprising a rod-shaped resin extrusion member slidably fitted to the gate, and a fluid pressure cylinder provided in a mold for driving the resin extrusion member forward and backward.
【０００５】[0005]
【発明の実施の形態】以下、本発明の実施の形態につい
て図面を参照して説明する。図１、図２は本発明に係る
中空物の射出成形装置の実施の形態の一例を示す要部の
断面図、図１におけるII−II線断面図である。図中１は
固定型２のキャビティ３と可動型４のコア５と相俟って
キャビティ部６を形成するコールドランナー方式の金型
で、この金型１は、そのキャビティ部６へ後述するラン
ナー及びゲートを経て溶融合成樹脂及びガスを圧入する
図示しないノズルと共に中空物の射出成形装置を構成す
るものである。金型１における固定型２と可動型４の階
段状をなすパーティングラインには、前記ノズルからキ
ャビティ部６に圧送される溶融合成樹脂及びガスの通路
となるランナー７及びゲート８が適宜に屈曲して設けら
れており、このゲート８とランナー７の接続部には、樹
脂溜まり９がゲート８に連ねて設けられている。そし
て、樹脂溜まり９とゲート８の周辺における金型１に
は、樹脂溜まり９とゲート８内の合成樹脂を溶融状態に
保持するヒータ１０，１１が固定型２と可動型４に分け
て埋設されている。又、金型１における固定型２と可動
型４のパーティングラインには、樹脂溜まり９を挿通し
てゲート８に摺動可能に嵌合する棒状の樹脂押出し部材
１２が樹脂溜まりに連ねて軸方向（図１、図２において
は左右方向）へ進退可能に設けられている。そして、樹
脂押出し部材１２は、可動型４に設けた油圧又は空圧等
を駆動媒体とする流体圧シリンダ１３のピストンロッド
１４と連結されている。図１、図２において１５は流体
圧シリンダ１３のシリンダチューブ１６に摺動可能に嵌
合したピストン、１７，１８はシリンダチューブ１６の
Ａ，Ｂポートである。Embodiments of the present invention will be described below with reference to the drawings. 1 and 2 are a sectional view of a main part showing an example of an embodiment of an injection molding apparatus for a hollow object according to the present invention, and a sectional view taken along line II-II in FIG. In the figure, reference numeral 1 denotes a cold runner type mold in which a cavity 6 is formed in combination with a cavity 3 of a fixed mold 2 and a core 5 of a movable mold 4. And a nozzle (not shown) for press-fitting the molten synthetic resin and gas through the gate to constitute an injection molding apparatus for hollow objects. A runner 7 and a gate 8 serving as a passage for the molten synthetic resin and gas fed from the nozzle to the cavity 6 are appropriately bent at the parting line in the step shape of the fixed mold 2 and the movable mold 4 in the mold 1. A resin reservoir 9 is provided at the connection between the gate 8 and the runner 7 in connection with the gate 8. In the mold 1 around the resin reservoir 9 and the gate 8, heaters 10 and 11 for holding the synthetic resin in the resin reservoir 9 and the gate 8 in a molten state are embedded separately into a fixed mold 2 and a movable mold 4. ing. Further, a rod-shaped resin extrusion member 12 which is inserted into the resin reservoir 9 and slidably fits in the gate 8 is connected to the parting line of the fixed die 2 and the movable die 4 of the mold 1 so as to be connected to the resin reservoir. It is provided so as to be able to advance and retreat in the direction (the horizontal direction in FIGS. 1 and 2). The resin extrusion member 12 is connected to a piston rod 14 of a fluid pressure cylinder 13 provided on the movable mold 4 and using hydraulic pressure or pneumatic pressure as a drive medium. 1 and 2, reference numeral 15 denotes a piston slidably fitted to a cylinder tube 16 of a fluid pressure cylinder 13, and reference numerals 17 and 18 denote A and B ports of the cylinder tube 16.
【０００６】上記構成の射出成形装置により中空物を射
出成形するには、先ず、図３に示すように、液体圧シリ
ンダ１３のピストンロッド１４を後退させて樹脂押出し
部材１２の先端が樹脂溜まり９の外にあるようにしてお
き、ノズルからランナー７、樹脂溜まり９及びゲート８
を経てキャビティ部６に未充填量の溶融合成樹脂１９を
射出する。次に、図４に示すように、ノズルから溶融合
成樹脂１９と同じ経路でキャビティ部６内の溶融合成樹
脂１９中に高圧ガスを圧入し、保圧して溶融合成樹脂１
９に中空部２０を形成して成形品２１とした後、中空部
２０内のガスを圧入時と逆の経路で放出する。この際、
ガス通過孔２２がランナー７、樹脂溜まり９及びゲート
８の合成樹脂２３並びに成形品２１に形成される。次い
で、ヒータ１０，１１により樹脂溜まり９とゲート８内
の合成樹脂２３を溶融状態に保持しながら、キャビティ
部６内の成形品２１とランナー７内の合成樹脂２３を冷
却固化させた後、図５に示すように、流体圧シリンダ１
３のピストンロッド１４を前進駆動して樹脂押出し部材
１２を、樹脂溜まり９を挿通させてゲート８に嵌合さ
せ、溶融状態に保持された樹脂溜まり９内の合成樹脂２
３の一部とゲート８内の全ての合成樹脂２３を成形品２
１のガス通過孔２２に押し出してそのガス通過孔２２を
閉塞する。なお、合成樹脂が熱可塑性樹脂（ポリプロピ
レン）の場合、樹脂溜まり９とゲート８内の金型温度
は、ヒータ１０，１１により８０〜１００℃の温度に維
持されるものである。このように金型温度をコントロー
ルすることにより、樹脂押出し部材１２によって押し出
される樹脂溜まり９とゲート８内の合成樹脂を、ガス通
過孔２２を閉塞するための最適温度に保持することがで
きる。又、棒状の樹脂押出し部材１２の外径（直径）
は、射出される合成樹脂の粘度にもよるが、ゲート８の
内径（直径）より、０．１ｍｍ程度小さくするのが好ま
しい。次に、図６に示すように、流体圧シリンダ１３の
ピストンロッド１４を後退駆動して樹脂押出し部材１２
を、ゲート８及び樹脂溜まり９から後退させた後、金型
１の固定型２と可動型４を開放し、成形品２１及びラン
ナー７内の合成樹脂２３を取り出す。In order to injection-mold a hollow object by the injection molding apparatus having the above-described structure, first, as shown in FIG. 3, the piston rod 14 of the hydraulic cylinder 13 is retracted so that the tip of the resin extruding member 12 becomes the resin reservoir 9. From the nozzle, the runner 7, the resin reservoir 9 and the gate 8 from the nozzle.
After that, the unfilled amount of the molten synthetic resin 19 is injected into the cavity 6. Next, as shown in FIG. 4, a high-pressure gas is injected from the nozzle into the molten synthetic resin 19 in the cavity 6 along the same path as the molten synthetic resin 19, and the pressure is maintained to maintain the molten synthetic resin 1.
After forming the hollow part 20 in 9 and forming the molded article 21, the gas in the hollow part 20 is discharged by the reverse route to that at the time of press fitting. On this occasion,
Gas passage holes 22 are formed in the synthetic resin 23 of the runner 7, the resin reservoir 9, the gate 8, and the molded product 21. Next, the molded product 21 in the cavity 6 and the synthetic resin 23 in the runner 7 are cooled and solidified while the resin pool 9 and the synthetic resin 23 in the gate 8 are kept in a molten state by the heaters 10 and 11. As shown in FIG.
The piston rod 14 of FIG. 3 is driven forward, and the resin extruding member 12 is fitted into the gate 8 through the resin reservoir 9 and the synthetic resin 2 in the resin reservoir 9 held in a molten state.
3 and all the synthetic resins 23 in the gate 8 are molded
One gas passage hole 22 is pushed out to close the gas passage hole 22. When the synthetic resin is a thermoplastic resin (polypropylene), the mold temperature in the resin reservoir 9 and the gate 8 is maintained at a temperature of 80 to 100 ° C. by the heaters 10 and 11. By controlling the mold temperature in this manner, the resin pool 9 extruded by the resin extruding member 12 and the synthetic resin in the gate 8 can be maintained at an optimum temperature for closing the gas passage hole 22. The outer diameter (diameter) of the rod-shaped resin extrusion member 12
Although it depends on the viscosity of the synthetic resin to be injected, it is preferable that the diameter be smaller than the inner diameter (diameter) of the gate 8 by about 0.1 mm. Next, as shown in FIG. 6, the piston rod 14 of the fluid pressure cylinder 13 is driven backward to drive the resin extrusion member 12.
Is retracted from the gate 8 and the resin reservoir 9, the fixed mold 2 and the movable mold 4 of the mold 1 are opened, and the molded product 21 and the synthetic resin 23 in the runner 7 are taken out.
【０００７】なお、上述した実施の形態においては、金
型１をコールドランナー方式のものとする場合について
説明したが、これに限定されるものではなく、ホットラ
ンナー方式の金型を用いた中空物の射出成形装置にも適
用できるのは自明である。In the above-described embodiment, a case has been described in which the mold 1 is of a cold runner type. However, the present invention is not limited to this, and a hollow object using a hot runner type mold is described. It is obvious that the present invention can also be applied to the injection molding apparatus.
【０００８】[0008]
【発明の効果】以上説明したように、本発明の中空物の
射出成形方法及びその装置によれば、成形品のガス通過
孔の閉塞が、ゲートとランナーとの接続部において溶融
状態に保持された合成樹脂の一部及びゲート内において
溶融状態に保持された合成樹脂の全部を用いて行われる
ので、コールドランナー方式に限らずホットランナー方
式のものにも適用することができ、又、成形品とランナ
ーとの間にゲート樹脂を存在させなくすることができ、
従来のようなゲート樹脂の後加工処理工程を不要とする
ことができる。As described above, according to the method and the apparatus for injection molding a hollow object of the present invention, the gas passage hole of the molded product is kept in a molten state at the connection between the gate and the runner. Of the synthetic resin held in the molten state in the gate and the entirety of the synthetic resin held in the molten state, so that it can be applied not only to the cold runner type but also to the hot runner type, Between the gate resin and the runner.
The conventional post-processing process of the gate resin can be omitted.
【図１】本発明に係る中空物の射出成形装置の実施の形
態の一例を示す要部の断面図である。FIG. 1 is a sectional view of a main part showing an example of an embodiment of an injection molding apparatus for hollow objects according to the present invention.
【図２】図１におけるII−II線断面図である。FIG. 2 is a sectional view taken along line II-II in FIG.
【図３】本発明に係る中空物の射出成形方法の実施の形
態の一例を示す第１工程の説明図である。FIG. 3 is an explanatory view of a first step showing an example of an embodiment of a method for injection molding a hollow object according to the present invention.
【図４】本発明に係る中空物の射出成形方法の実施の形
態の一例を示す第２工程の説明図である。FIG. 4 is an explanatory view of a second step showing one example of an embodiment of the method for injection-molding a hollow object according to the present invention.
【図５】本発明に係る中空物の射出成形方法の実施の形
態の一例を示す第３工程の説明図である。FIG. 5 is an explanatory view of a third step showing an example of the embodiment of the method for injection-molding a hollow object according to the present invention.
【図６】本発明に係る中空物の射出成形方法の実施の形
態の一例を示す第４工程の説明図である。FIG. 6 is an explanatory view of a fourth step showing an example of the embodiment of the method for injection-molding a hollow object according to the present invention.
１ 金型 ６ キャビティ部 ７ ランナー ８ ゲート ９ 樹脂溜まり １０ ヒータ １１ ヒータ １２ 樹脂押出し部材 １３ 流体圧シリンダ ２１ 成形品 ２２ ガス通過孔 ２３ 合成樹脂 DESCRIPTION OF SYMBOLS 1 Mold 6 Cavity part 7 Runner 8 Gate 9 Resin pool 10 Heater 11 Heater 12 Resin extrusion member 13 Fluid pressure cylinder 21 Molded product 22 Gas passage hole 23 Synthetic resin
Claims (2)
脂及びガスをランナー及びゲートを経て圧入するノズル
とを用いる中空物の射出成形方法において、前記キャビ
ティ部に未充填量の溶融合成樹脂を射出した後、その溶
融合成樹脂中に対するガスの圧入、保圧及び放出をし、
少なくともキャビティ部内の合成樹脂が冷却固化してか
ら、ゲートとランナーとの接続部においてゲート内の合
成樹脂と共に溶融状態に保持した合成樹脂の一部をゲー
ト内の全ての合成樹脂と共に成形品のガス通過孔へ押し
出してそのガス通過孔を閉塞することを特徴とする中空
物の射出成形方法。In a method for injection molding a hollow object using a mold and a nozzle for press-fitting a molten synthetic resin and gas into a cavity portion thereof through a runner and a gate, an unfilled amount of the molten synthetic resin is filled in the cavity portion. After injection, press-fit, hold and release gas into the molten synthetic resin,
After at least the synthetic resin in the cavity is cooled and solidified, a part of the synthetic resin held in a molten state together with the synthetic resin in the gate at the connection between the gate and the runner is molded together with all the synthetic resins in the gate to form a molded product gas. A method for injection molding a hollow object, wherein the method is extruded into a passage hole to close the gas passage hole.
脂及びガスをランナー及びゲートを経て圧入するノズル
とを有する中空物の射出成形装置において、前記ゲート
とランナーとの接続部にゲートに連ねて設けた樹脂溜ま
りと、樹脂溜まりとゲートの周辺の金型に埋設したヒー
タと、樹脂溜まりに連ねて金型に軸方向へ進退可能に設
けられ、樹脂溜まりを挿通してゲートに摺動可能に嵌合
する棒状の樹脂押出し部材と、樹脂押出し部材を進退駆
動するため金型に設けた流体圧シリンダとを備えること
を特徴とする中空物の射出成形装置。2. An injection molding apparatus for a hollow object having a mold and a nozzle for press-fitting a molten synthetic resin and a gas into a cavity portion of the mold through a runner and a gate, wherein a connecting portion between the gate and the runner is connected to the gate. The resin reservoir provided in the mold, the heater buried in the mold around the resin reservoir and the gate, and the resin reservoir is connected to the mold so that it can move in and out of the mold in the axial direction. An injection molding apparatus for a hollow object, comprising: a rod-shaped resin extruding member fitted into a member; and a fluid pressure cylinder provided in a mold for driving the resin extruding member forward and backward.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP34732795A JP2704715B2 (en) | 1995-12-14 | 1995-12-14 | Hollow injection molding method and apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP34732795A JP2704715B2 (en) | 1995-12-14 | 1995-12-14 | Hollow injection molding method and apparatus |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH09327840A JPH09327840A (en) | 1997-12-22 |
| JP2704715B2 true JP2704715B2 (en) | 1998-01-26 |
Family
ID=18389476
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP34732795A Expired - Fee Related JP2704715B2 (en) | 1995-12-14 | 1995-12-14 | Hollow injection molding method and apparatus |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2704715B2 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001198942A (en) * | 2000-01-24 | 2001-07-24 | Sumitomo Heavy Ind Ltd | Method for molding foamed molded article and injection molding machine |
| EP2113360B1 (en) * | 2008-04-30 | 2013-07-17 | Röchling Automotive AG & Co. KG | Casting device with heatable auxiliary cavity |
| DE102012014013B4 (en) * | 2012-07-17 | 2022-02-24 | Illinois Tool Works Inc. | Method and device for producing a plastic part, in particular a plastic part for an automobile, in an injection molding process |
-
1995
- 1995-12-14 JP JP34732795A patent/JP2704715B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH09327840A (en) | 1997-12-22 |
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