JPH0622834B2 - Injection compression molding method and apparatus - Google Patents
Injection compression molding method and apparatusInfo
- Publication number
- JPH0622834B2 JPH0622834B2 JP2180575A JP18057590A JPH0622834B2 JP H0622834 B2 JPH0622834 B2 JP H0622834B2 JP 2180575 A JP2180575 A JP 2180575A JP 18057590 A JP18057590 A JP 18057590A JP H0622834 B2 JPH0622834 B2 JP H0622834B2
- Authority
- JP
- Japan
- Prior art keywords
- mold
- movable
- cavity
- injection
- fixed
- 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
- B29C45/1704—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
- B29C45/1705—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 using movable mould parts
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】 （イ）産業上の利用分野 本発明は、射出圧縮成形方法及び装置に関するものであ
る。TECHNICAL FIELD The present invention relates to an injection compression molding method and apparatus.
（ロ）従来の技術 従来の射出圧縮成形装置として、たとえば特開昭６１−
２８３５２０号公報に示されるものがある。これに示さ
れる射出圧縮成形装置では、型締装置の固定盤及び可動
盤にそれぞれ固定金型及び可動金型を取り付け、型閉時
に固定金型及び可動金型のそれぞれ凸部及び凹部がはま
り合ってはいるが、完全には密着していない状態、すな
わち両金型のパーティング面間にすき間がある型閉途中
の状態で型閉をいったん停止し、この停止状態で射出を
行い、次いで更に可動盤を前進させて型締を行うことに
より成形品を圧縮する。これによりひずみが少なく形状
精度の高い成形品を得ることができる。(B) Conventional Technology As a conventional injection compression molding apparatus, for example, Japanese Patent Laid-Open No. 61-
There is one disclosed in Japanese Patent No. 283520. In the injection compression molding apparatus shown in the figure, a fixed mold and a movable mold are attached to a fixed plate and a movable plate of a mold clamping device, and when the mold is closed, the convex and concave portions of the fixed mold and the movable mold fit together. However, when the molds are not completely in close contact with each other, that is, when there is a gap between the parting surfaces of the two dies, the molds are temporarily closed, injection is performed in this stopped state, and then The movable platen is moved forward and the mold is clamped to compress the molded product. This makes it possible to obtain a molded product with less distortion and high shape accuracy.
（ハ）発明が解決しようとする課題 しかしながら、上記のような従来の射出圧縮成形装置で
は、通常の樹脂を用いて内部に樹脂がつまった。中実状
の成形品を成形したり、発泡性樹脂を用いて内部に多数
のあわ状の空気が入った、多孔質の成形品を成形したり
することはできるが、中空状の成形品を製造することは
できないという問題点がある。(C) Problem to be Solved by the Invention However, in the conventional injection compression molding apparatus as described above, a normal resin is used and the resin is clogged inside. It is possible to mold a solid molded product or a porous molded product that contains a large number of foam-like air inside using a foamable resin, but manufactures a hollow molded product There is a problem that you cannot do it.
本発明はこのような課題を解決することを目的としてい
る。The present invention aims to solve such problems.
（ニ）課題を解決するための手段 本発明は、型閉する前のキャビティ内に溶融樹脂を固ま
り状になるように射出し、この固まりの中に気体を注入
し、型締めして成形品を圧縮することにより、上記課題
を解決する。すなわち、本発明の射出圧縮成形方法は、
型閉完了前の金型（１４・１６）のキャビティ（Ｃ）内
に溶融樹脂（３０）を固まり状になるように射出し、こ
の溶融樹脂（３０）の内部に気体を注入して風船状のパ
リソン（３０ａ）を形成し、この気体の注入中又は注入
後に型締を行うことによって、パリソン（３０ａ）を圧
縮して成形品（３０ｂ）を成形するようにしている。(D) Means for Solving the Problem The present invention is to inject a molten resin into a cavity before the mold is closed so as to form a solid mass, inject gas into the solid mass, and clamp the mold to form a molded product. The above problem is solved by compressing. That is, the injection compression molding method of the present invention,
Molten resin (30) is injected into the cavity (C) of the mold (14, 16) before completion of mold closing so as to form a solid mass, and gas is injected into the molten resin (30) to form a balloon shape. The parison (30a) is formed, and the parison (30a) is compressed during or after the injection of the gas to form the molded product (30b).
また、上記方法を実施するための本発明の装置は、固定
盤（１０）及び可動盤（１２）を有する型締装置と、固
定盤（１０）に取り付けられる固定金型（１４）と、可
動盤（１２）に取り付けられる可動金型（１６）と、を
有しており、 固定金型（１４）又は可動金型（１６）にこれを通って
キャビティ（Ｃ）の壁の一部を構成する壁面に開口する
樹脂通路（１８）が形成されており、固定金型（１４）
又は可動金型（１６）にこれを通ってキャビティ（Ｃ）
の壁の一部を構成する壁面を貫通しキャビティ（Ｃ）内
に伸びた開口部（２０ａ）を有する気体通路（２０）が
形成されている。なお、かっこ内の符号は実施例の対応
する部材を示す。Further, the apparatus of the present invention for carrying out the above method comprises a mold clamping device having a fixed plate (10) and a movable plate (12), a fixed mold (14) attached to the fixed plate (10), and a movable mold. A movable mold (16) attached to the board (12), and passing through the fixed mold (14) or the movable mold (16) to form a part of the wall of the cavity (C). A resin passage (18) opening to the wall surface is formed, and the fixed mold (14) is formed.
Or, the cavity (C) is passed through the movable mold (16).
A gas passageway (20) having an opening (20a) that extends through the wall surface forming a part of the wall and extends into the cavity (C). The reference numerals in parentheses indicate the corresponding members of the embodiment.
（ホ）作用 型閉する前のキャビティ内に溶融樹脂を固まり状になる
ように射出する。この固まりの中に空気などの気体を所
定量注入する。これにより溶融樹脂は、風船状に膨れた
パリソンとなる。この状態で型締めを行って、パリソン
を圧縮成形する。金型を冷却した後、これを開く。こう
することによって中空状の成形品を製造することができ
る。(E) Action Molten resin is injected into the cavity before the mold is closed so as to form a solid mass. A predetermined amount of gas such as air is injected into this mass. This causes the molten resin to become a balloon-shaped parison. The mold is clamped in this state to compression-mold the parison. After cooling the mold, open it. By doing so, a hollow molded article can be manufactured.
（ヘ）実施例 第１〜３図に本発明の実施例を示す。型締装置の固定盤
１０と可動盤１２とが互いに対面する状態で設けられて
いる。可動盤１２は図示してない型締シリンダによって
固定盤１０に近づく方向及びこれから遠ざかる方向に移
動可能である。固定盤１０には固定金型１４が取り付け
られ、また可動盤１２には可動金型１６が取り付けられ
ている。固定金型１４は、２つの段付き凸部を有する柱
状に形成されている。可動金型１６は、断面が「凹」字
形に形成されている。固定金型１４の中間の外径部は、
可動金型１６の筒状の穴にはめ合わせることが可能であ
る。可動金型１６と固定金型１４とがはめ合わされた状
態で、両金型１４及び１６間の空間部によって断面が
「コ」字状のキャビティＣが形成されるようになってい
る。固定金型１４及び可動金型１６のはめ合い部の寸法
は、第１図に示す位置から可動金型１６がさらに型閉じ
方向に移動したとき、キャビティＣ内の空気を排出する
ことが可能なすき間に選定されている。固定金型１４に
は、キャビティＣに開口する樹脂通路１８が形成されて
いる。すなわち樹脂通路１８は、固定金型１４の図中左
側の壁面より金型中央部へ向けて設けられ、途中で上方
に曲がりこれの上側の面の中央部に開口している。キャ
ビティＣには、図示してない射出装置から樹脂通路１８
を通って溶融樹脂を射出することが可能である。また可
動金型１６には、キャビティＣの中まで伸びた空気通路
２０が形成されている。すなわち空気通路２０は、可動
金型１６の図中上側の面と下側の面とを貫通してキャビ
ティＣの中まで伸びている。空気通路２０の開口部２０
ａは、樹脂通路１８の開口部と向かい合う位置に配置さ
れている。後述するように、キャビティＣ内に溶融樹脂
３０が開口部２０ａを包み込むように固まり状に供給さ
れた状態で、図示してない空気源から空気通路２０を通
り上記溶融樹脂３０内に空気を供給することが可能であ
る。(F) Example An example of the present invention is shown in FIGS. The fixed platen 10 and the movable platen 12 of the mold clamping device are provided so as to face each other. The movable platen 12 can be moved by a mold clamping cylinder (not shown) in a direction toward and away from the fixed platen 10. A fixed die 14 is attached to the fixed platen 10, and a movable die 16 is attached to the movable platen 12. The fixed mold 14 is formed in a columnar shape having two stepped protrusions. The movable mold 16 has a "concave" cross section. The outer diameter part of the middle of the fixed mold 14 is
It is possible to fit it in the cylindrical hole of the movable mold 16. With the movable mold 16 and the fixed mold 14 fitted together, the space C between the molds 14 and 16 forms a cavity C having a U-shaped cross section. The size of the fitting portion of the fixed mold 14 and the movable mold 16 is such that the air in the cavity C can be discharged when the movable mold 16 further moves in the mold closing direction from the position shown in FIG. Selected in the gap. A resin passage 18 that opens into the cavity C is formed in the fixed mold 14. That is, the resin passage 18 is provided from the wall surface on the left side of the fixed mold 14 toward the center of the mold, bends upward in the middle, and opens at the center of the upper surface of the mold. A resin passage 18 is provided in the cavity C from an injection device (not shown).
It is possible to inject molten resin therethrough. Further, the movable mold 16 is formed with an air passage 20 extending into the cavity C. That is, the air passage 20 extends through the upper surface and the lower surface of the movable mold 16 in the drawing into the cavity C. Opening 20 of air passage 20
The a is arranged at a position facing the opening of the resin passage 18. As will be described later, in a state where the molten resin 30 is supplied into the cavity C in a solid state so as to surround the opening 20a, air is supplied into the molten resin 30 from an air source (not shown) through the air passage 20. It is possible to
次にこの実施例の作用を説明する。可動盤１２は、第１
図に示す型閉の途中位置まで移動した状態でいったん停
止させられる。次いで図示してない射出装置から溶融樹
脂３０が、樹脂通路１８を通ってキャビティＣに年度の
高い状態で射出される。これにより溶融樹脂３０は、空
気通路２０の開口部２０ａを包み込んだ固まり状とな
る。溶融樹脂３０の射出は、両金型１４・１６が型閉さ
れる前に行われるので、射出圧力は低圧のものとするこ
とができる。溶融樹脂３０の射出終了後に、図示してな
い空気源から空気通路２０を通り開口部２０ａから溶融
樹脂３０内に所定量の空気が吹き込まれる。これにより
溶融樹脂３０は、第２図に示すように、中に空気が入っ
た風船状のパリソン３０ａとされる。空気の注入終了後
に、再び可動盤を駆動して第３図に示すように型締を行
う。これによりパリソン３０ａは、断面が「コ」字状を
した中空の成形品３０ｂとされる。両金型１４・１６を
冷却して、可動盤１２を型開方向に移動させて可動金型
１６を開き、成形品３０ｂを取り出す。風船状のパリソ
ン３０ａをキャビティＣに合わせて圧縮成形するので、
肉厚の均一な中空成形品を製造することができる。Next, the operation of this embodiment will be described. The movable platen 12 is the first
It is stopped once it has moved to the middle position of the mold closing shown in the figure. Then, the molten resin 30 is injected from the injection device (not shown) into the cavity C through the resin passage 18 at a high year. As a result, the molten resin 30 has a solid shape that encloses the opening 20a of the air passage 20. Since the molten resin 30 is injected before the molds 14 and 16 are closed, the injection pressure can be low. After the injection of the molten resin 30 is completed, a predetermined amount of air is blown into the molten resin 30 from an air source (not shown) through the air passage 20 and the opening 20a. As a result, the molten resin 30 becomes a balloon-shaped parison 30a having air therein, as shown in FIG. After the air injection is completed, the movable plate is driven again to perform mold clamping as shown in FIG. As a result, the parison 30a becomes a hollow molded product 30b having a "U" -shaped cross section. Both molds 14 and 16 are cooled, the movable platen 12 is moved in the mold opening direction to open the movable mold 16, and the molded product 30b is taken out. Since the balloon-shaped parison 30a is compression-molded according to the cavity C,
It is possible to manufacture a hollow molded product having a uniform wall thickness.
なお、上記説明では、固定金型１４に樹脂通路１８を設
け、可動金型１６に空気通路２０を設けるものとした
が、これらは互いに逆の配置としてもよい。また、樹脂
通路１８及び空気通路２０を一方の金型、たとえば固定
金型１４に設けるようにして、たとえば相手側の可動金
型１６には何も設けないようにしてもよい。Although the fixed mold 14 is provided with the resin passage 18 and the movable mold 16 is provided with the air passage 20 in the above description, they may be arranged in reverse. Alternatively, the resin passage 18 and the air passage 20 may be provided in one mold, for example, the fixed mold 14, and nothing may be provided, for example, in the movable mold 16 on the other side.
また、上記説明では、可動盤１２を型閉の途中位置で停
止させて溶融樹脂３０の射出を行うものとしたが、可動
盤１２を停止させないで、微速で型閉方向に移動中に溶
融樹脂３０の射出を行うようにすることもできる。Further, in the above description, the movable platen 12 is stopped at an intermediate position of mold closing to inject the molten resin 30, but the movable platen 12 is not stopped, and the molten resin 30 is moving at a slight speed in the mold closing direction. It is also possible to perform 30 injections.
さらに、空気の注入は、溶融樹脂３０の射出終了後に行
うものとしたが、溶融樹脂３０の射出途中から空気の注
入を開始するようにすることもできる。Further, although the injection of air is performed after the injection of the molten resin 30 is finished, the injection of the air can be started during the injection of the molten resin 30.
なお、空気の注入は、型締め前に終了するものとした
が、圧縮成形中又は冷却中に空気の注入を続けるように
することもできる。Although the injection of air is finished before the mold is clamped, the injection of air may be continued during the compression molding or cooling.
また、上記説明では、溶融樹脂内に注入する気体として
空気を用いるものとしたが、空気以外の気体、たとえば
窒素を用いるようにすることもできる。Further, in the above description, air is used as the gas to be injected into the molten resin, but a gas other than air, for example, nitrogen can be used.
（ト）発明の効果 以上説明してきたように、本発明によると、均一な肉厚
の中空成形品を製造することができる。成形品に薄肉部
やリブの部分があっても、これらの部分を確実に中空の
ものとすることができる。型閉前のキャビティ内に溶融
樹脂を注入するので、射出圧力は低圧でよく、機械装置
を安価なものとすることができる。(G) Effect of the Invention As described above, according to the present invention, it is possible to manufacture a hollow molded product having a uniform wall thickness. Even if the molded product has a thin portion or a rib portion, these portions can be surely made hollow. Since the molten resin is injected into the cavity before the mold is closed, the injection pressure may be low and the mechanical device can be inexpensive.
第１図は本発明の実施例の射出圧縮装置の断面図、第２
図は気体の注入を完了した状態を示す図、第３図は圧縮
成形を完了した状態を示す図である。 １０……固定盤、１２……可動盤、 １４……固定金型、１６……可動金型、 １８……樹脂通路、２０……気体通路、 ２０ａ……開口部、３０……溶融樹脂、 ３０ａ……パリソン、３０ｂ……成形品、 Ｃ……キャビティ。FIG. 1 is a sectional view of an injection compression device according to an embodiment of the present invention, and FIG.
The figure shows a state in which gas injection is completed, and FIG. 3 is a figure in which compression molding is completed. 10: fixed plate, 12: movable plate, 14: fixed mold, 16: movable mold, 18: resin passage, 20: gas passage, 20a: opening, 30: molten resin, 30a ... Parison, 30b ... Molded product, C ... Cavity.
Claims (2)
ティ（Ｃ）内に溶融樹脂（３０）を固まり状になるよう
に射出し、この溶融樹脂（３０）の内部に気体を注入し
て風船状のパリソン（３０ａ）を形成し、この気体の注
入中又は注入後に型締を行うことによって、パリソン
（３０ａ）を圧縮して成形品（３０ｂ）を成形する射出
圧縮成形方法。1. A molten resin (30) is injected into a cavity (C) of a mold (14, 16) before completion of mold closing so as to form a mass, and a gas is injected into the molten resin (30). An injection compression molding method in which a parison (30a) is injected to form a balloon-shaped parison, and the parison (30a) is compressed to mold a molded article (30b) by performing mold clamping during or after the injection of the gas.
る型締装置と、固定盤（１０）に取り付けられる固定金
型（１４）と、可動盤（１２）に取り付けられる可動金
型（１６）と、を有しており、 固定金型（１４）又は可動金型（１６）にこれを通って
キャビティ（Ｃ）の壁の一部を構成する壁面に開口する
樹脂通路（１８）が形成されており、固定金型（１４）
又は可動金型（１６）にこれを通ってキャビティ（Ｃ）
の壁の一部を構成する壁面を貫通しキャビティ（Ｃ）内
に伸びた開口部（２０ａ）を有する気体通路（２０）が
形成されている射出圧縮成形装置。2. A mold clamping device having a fixed plate (10) and a movable plate (12), a fixed mold (14) attached to the fixed plate (10), and a movable mold attached to the movable plate (12). (16) and a resin passageway (18) opening through the fixed mold (14) or the movable mold (16) to the wall surface forming a part of the wall of the cavity (C). Molded and fixed mold (14)
Or, the cavity (C) is passed through the movable mold (16).
Injection compression molding apparatus in which a gas passage (20) having an opening (20a) penetrating a wall surface that constitutes a part of the wall and extending into the cavity (C) is formed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2180575A JPH0622834B2 (en) | 1990-07-10 | 1990-07-10 | Injection compression molding method and apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2180575A JPH0622834B2 (en) | 1990-07-10 | 1990-07-10 | Injection compression molding method and apparatus |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0469224A JPH0469224A (en) | 1992-03-04 |
| JPH0622834B2 true JPH0622834B2 (en) | 1994-03-30 |
Family
ID=16085676
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2180575A Expired - Lifetime JPH0622834B2 (en) | 1990-07-10 | 1990-07-10 | Injection compression molding method and apparatus |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0622834B2 (en) |
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|---|---|---|---|---|
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| JPS6024913A (en) * | 1983-05-11 | 1985-02-07 | ピールレス シンプレス リミティド | Injection molding method and device |
| JPS6122917A (en) * | 1984-07-10 | 1986-01-31 | Sumitomo Chem Co Ltd | Press-molding method of thermoplastic resin |
| JPS63165114A (en) * | 1986-12-26 | 1988-07-08 | Nec Home Electronics Ltd | Method and mold equipment for injection molding |
| JPH03133618A (en) * | 1989-10-20 | 1991-06-06 | Mitsubishi Heavy Ind Ltd | Molding method for plastic molded product |
-
1990
- 1990-07-10 JP JP2180575A patent/JPH0622834B2/en not_active Expired - Lifetime
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|---|---|---|---|---|
| JPS4841264A (en) * | 1971-09-29 | 1973-06-16 | ||
| JPS5714968A (en) * | 1980-07-02 | 1982-01-26 | Hitachi Ltd | Process and control system for information at point of sales time |
| JPS6024913A (en) * | 1983-05-11 | 1985-02-07 | ピールレス シンプレス リミティド | Injection molding method and device |
| JPS6122917A (en) * | 1984-07-10 | 1986-01-31 | Sumitomo Chem Co Ltd | Press-molding method of thermoplastic resin |
| JPS63165114A (en) * | 1986-12-26 | 1988-07-08 | Nec Home Electronics Ltd | Method and mold equipment for injection molding |
| JPH03133618A (en) * | 1989-10-20 | 1991-06-06 | Mitsubishi Heavy Ind Ltd | Molding method for plastic molded product |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0469224A (en) | 1992-03-04 |
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