JPH07299841A - Molding of double-layered molded object - Google Patents
Molding of double-layered molded objectInfo
- Publication number
- JPH07299841A JPH07299841A JP11339094A JP11339094A JPH07299841A JP H07299841 A JPH07299841 A JP H07299841A JP 11339094 A JP11339094 A JP 11339094A JP 11339094 A JP11339094 A JP 11339094A JP H07299841 A JPH07299841 A JP H07299841A
- Authority
- JP
- Japan
- Prior art keywords
- molten resin
- injected
- closed
- mold cavity
- 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.)
- Granted
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
-
- 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
- B29C45/14—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
- B29C45/1418—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles the inserts being deformed or preformed, e.g. by the injection pressure
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、例えば自動車、一般機
械、電気・電子機器等の分野に広く利用される複層成形
体の成形方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for molding a multi-layer molded article which is widely used in the fields of automobiles, general machinery, electric / electronic devices, etc.
【０００２】[0002]
【従来の技術】樹脂層の表面にファブリックあるいはレ
ザーなどの表皮層を有する複層成形体は、その改善され
た表面性ゆえに各種産業分野において需要が増してい
る。2. Description of the Related Art Multi-layered molded products having a resin layer on the surface of which is a skin layer such as fabric or leather are in increasing demand in various industrial fields because of their improved surface properties.
【０００３】かかる複層成形体の成形方法としては、表
皮層をセットした金型キャビティ内に、金型キャビティ
を不完全に閉じた状態で溶融樹脂を注入し、その後金型
キャビティを完全に閉じて成形する、いわゆるスタンピ
ングあるいは圧縮成形方法が知られており、各種の複層
成形体が実用に供されている。As a method for molding such a multi-layer molded body, a molten resin is injected into a mold cavity in which a skin layer is set with the mold cavity being incompletely closed, and then the mold cavity is completely closed. There is known a so-called stamping or compression molding method, in which various multilayer moldings are put into practical use.
【０００４】一方、溶融樹脂中に高圧のガスを注入して
成形する、例えば特公昭５７−１４９６８号に代表され
るいわゆる中空射出成形方法が、成形体の“ひけ”や変
形を防止し外観を向上，改善できる成形方法として広く
応用されだしている。On the other hand, a so-called hollow injection molding method represented by Japanese Patent Publication No. 57-14968, for example, in which a high-pressure gas is injected into a molten resin, prevents "sinker" or deformation of the molded product and improves the appearance. It has been widely applied as a molding method that can be improved and improved.
【０００５】また、上記のスタンピングあるいは圧縮成
形方法と中空射出成形方法を組み合わせた方法が特開平
４−７４６１７号，特開平４−２５５３１４号などで提
案されている。Further, a method in which the above-mentioned stamping or compression molding method and a hollow injection molding method are combined has been proposed in JP-A-4-74617 and JP-A-4-255314.
【０００６】[0006]
【発明が解決しようとする課題】しかしながら、従来提
案されている方法では、単なるスタンピングあるいは圧
縮成形方法による場合よりも成形体の状態は改善される
ものの、以下のような問題点が有った。However, although the method proposed hitherto can improve the state of the molded body as compared with the case of a simple stamping or compression molding method, it has the following problems.
【０００７】例えば、金型が僅かに開いた状態で溶融樹
脂を注入し、金型を完全に閉じて溶融樹脂を圧縮した後
にガスを注入する方法では、樹脂の充填圧力が高いため
にガスの注入が不完全な状態になりやすく、中空部の形
成による効果が十分に発揮されない場合が有った。For example, in the method of injecting the molten resin in a state where the mold is slightly opened and then injecting the gas after the mold is completely closed and the molten resin is compressed, the filling pressure of the resin is high, so that the gas Injecting is likely to be incomplete, and the effect of forming the hollow portion may not be fully exerted.
【０００８】また、特開平４−７４６１７号で提案され
ているように、金型が僅かに開いた状態で溶融樹脂を注
入し、樹脂を注入しつつ或は加圧成形に至る過程でガス
を注入する方法では、金型締めの過程における樹脂圧に
ばらつきが生じやすく、樹脂中に形成される中空部が不
規則に変形し、特に非対称形の成形体を成形する場合に
は所定の位置以外の不必要な部分に中空部が形成され、
成形体の外観や品質の低下さらには強度低下を招きやす
い。Further, as proposed in Japanese Patent Laid-Open No. 4-74617, a molten resin is injected with the mold slightly opened, and a gas is injected while the resin is injected or during the pressure molding. In the injection method, the resin pressure tends to vary during the mold clamping process, the hollow part formed in the resin deforms irregularly, and especially when molding an asymmetric molded body A hollow part is formed in the unnecessary part of
The appearance and quality of the molded product are liable to be lowered, and further the strength is apt to be lowered.
【０００９】また、特開平４−２５５３１４号で提案さ
れているように、金型が僅かに開いた状態で溶融樹脂を
注入し、金型締めの完了前あるいは完了と同時にガスを
注入し、さらにガスを注入しつつ金型を僅かに開く方法
では、中空部の変形は比較的少ないものの、成形体の寸
法精度が低下するため、精密部品の成形には適さない。Further, as proposed in Japanese Patent Laid-Open No. 4-255314, a molten resin is injected with the mold slightly opened, and a gas is injected before or at the same time when the mold clamping is completed. The method of slightly opening the mold while injecting gas is not suitable for molding precision parts because the hollow portion is relatively less deformed but the dimensional accuracy of the molded body is lowered.
【００１０】本発明は上記の問題点に着目してなされた
ものであって、その目的とするところは、中空部の形成
を容易にし、成形品の“ひけ”や変形を改善し優れた外
観を確保し得ると共に、型再現性に優れ精密部品の成形
にも十分に対応することのできる複層成形体の成形方法
を提供することにある。The present invention has been made in view of the above problems, and an object thereof is to facilitate the formation of a hollow portion, improve the "sinker" and deformation of a molded product, and have an excellent appearance. It is an object of the present invention to provide a method for forming a multi-layered molded product, which is capable of ensuring the above-mentioned properties, and which is excellent in mold reproducibility and can sufficiently cope with molding of precision parts.
【００１１】[0011]
【課題を解決するための手段及び作用】このために請求
項１の発明では、少なくとも、樹脂層と表皮層からなる
複層成形体の成形方法において、表皮層を配置、溶融樹
脂を注入した不完全に閉じた状態の金型キャビティを段
階的に閉じ、金型キャビティが不完全に閉じている段階
で溶融樹脂中に加圧ガスを注入して予備中空部を形成
し、金型キャビティを完全に閉じた段階で予備中空部に
更に加圧ガスを注入することを特徴とする複層成形体の
成形方法としているものである。For this reason, according to the invention of claim 1, in the method for molding a multi-layer molded article comprising at least a resin layer and a skin layer, the skin layer is arranged and the molten resin is injected. The mold cavity in a completely closed state is gradually closed, and when the mold cavity is incompletely closed, pressurized gas is injected into the molten resin to form a preliminary hollow part, and the mold cavity is completely closed. The method for forming a multi-layered molded product is characterized in that a pressurized gas is further injected into the preliminary hollow portion when closed.
【００１２】本発明の成形方法においては、金型キャビ
ティが不完全に閉じている段階で、金型キャビティ内の
溶融樹脂中に加圧ガスを注入し、予備中空部を形成す
る。この段階では溶融樹脂の圧力は比較的低圧であるた
め、容易に且つ確実に加圧ガスを注入することができ
る。In the molding method of the present invention, when the mold cavity is incompletely closed, a pressurized gas is injected into the molten resin in the mold cavity to form a preliminary hollow portion. At this stage, the pressure of the molten resin is relatively low, so that the pressurized gas can be injected easily and reliably.
【００１３】そして、金型キャビティを完全に閉じた段
階で、上記の予備中空部に更に加圧ガスを注入する。こ
の段階では溶融樹脂は比較的高圧であるものの、すでに
形成されている予備中空部に加圧ガスを注入するもので
あるため、容易に且つ確実に加圧ガスを注入することが
でき、最終的な中空部の形状をある程度制御することが
できる。すなわち、予め形成した予備中空部に更に加圧
ガスを注入することにより、該予備中空部を核として、
最終的な中空部に成長させることができるのである。Then, when the mold cavity is completely closed, pressurized gas is further injected into the preliminary hollow portion. At this stage, although the molten resin has a relatively high pressure, it is possible to inject the pressurized gas easily and surely because the pressurized gas is injected into the already formed preliminary hollow portion. The shape of the hollow portion can be controlled to some extent. That is, by further injecting a pressurized gas into the preliminarily formed preliminary hollow portion, the preliminary hollow portion serves as a nucleus,
It can be grown into the final hollow part.
【００１４】通常、予備中空部は、金型キャビティを閉
じていくに従い、その過程において生ずる樹脂圧のばら
つきにより変形する。特に非対称形の成形体を成形する
場合には上記の現象が顕著に現れる。Usually, as the mold cavity is closed, the preliminary hollow portion is deformed due to variations in resin pressure generated in the process. In particular, the above phenomenon is prominent when molding an asymmetric molded body.
【００１５】このため、本発明においては、予備中空部
は必要最低限の大きさで形成するのが好ましい。Therefore, in the present invention, it is preferable that the preliminary hollow portion is formed in the minimum necessary size.
【００１６】予備中空部が大き過ぎると、金型キャビテ
ィを完全に閉じた段階では、その形状が大きく変形して
いることが多い。このように変形した予備中空部に加圧
ガスを注入すると、最終的に形成される中空部も予定し
ていた形状にならず不必要な部分にまで中空部が形成さ
れがちである。If the preliminary hollow portion is too large, its shape is often greatly deformed when the mold cavity is completely closed. When pressurized gas is injected into the thus deformed preliminary hollow portion, the hollow portion to be finally formed does not have a predetermined shape, and the hollow portion tends to be formed even in an unnecessary portion.
【００１７】また本発明においては、溶融樹脂中に注入
される加圧ガスの圧力を、各段階における溶融樹脂の圧
力に応じて制御することが好ましい。Further, in the present invention, it is preferable that the pressure of the pressurized gas injected into the molten resin is controlled according to the pressure of the molten resin in each stage.
【００１８】すなわち、溶融樹脂が低圧の段階において
は、低圧の加圧ガスでも容易に圧入することができるた
め低圧に制御する。これによりガスの注入量をより厳密
に制御することができ、予備中空部を所望の大きさで形
成することができる。そして溶融樹脂が高圧の段階で
は、より高圧の加圧ガスを注入して中空部を成長させ
る。That is, when the molten resin has a low pressure, even a low pressure gas can be easily injected, so that the pressure is controlled to be low. As a result, the amount of gas injected can be controlled more strictly, and the preliminary hollow portion can be formed in a desired size. When the molten resin has a high pressure, a higher pressure gas is injected to grow the hollow portion.
【００１９】以上のように本発明によれば、溶融樹脂中
への加圧ガスの注入を極めて容易に良好な状態で行うこ
とができ、中空部の大きさや形状を制御して不必要な部
位に中空が形成されるのを防止することができる。この
ため、複層成形品の“ひけ”や変形を防止し更なる外観
の向上が成されると共に、不必要な中空部が形成される
ことによる強度低下を防止することができる。As described above, according to the present invention, it is extremely easy to inject the pressurized gas into the molten resin in a good state, and the size and shape of the hollow portion can be controlled to eliminate unnecessary portions. It is possible to prevent the formation of hollows in the inside. Therefore, it is possible to prevent the sink mark and the deformation of the multi-layer molded product and further improve the appearance, and it is possible to prevent the strength from being lowered due to the formation of unnecessary hollow portions.
【００２０】[0020]
【実施例】以下に実施例をもって本発明を説明する。EXAMPLES The present invention will be described below with reference to examples.
【００２１】本例の成形工程について図１を用いて説明
する。The molding process of this example will be described with reference to FIG.
【００２２】先ず、図１（ａ）に示されるように、可動
型１と固定型２からなる金型キャビティを不完全に閉じ
た状態で、表皮層３をセットし、溶融樹脂４を注入する
か、又は溶融樹脂４を注入し、表皮層３をセットする。
不完全に閉じた状態とは、図１（ａ）のように可動型１
と固定型２が完全に離合した状態に限らず、図１（ｂ）
のように可動型１と固定型２の一部は噛み合うが、いわ
ゆるパーティング面は噛み合わない状態であっても良
く、さらにはキャビティを複数のブロックで構成した場
合には、パーティング面は噛み合うが一部のブロックに
圧縮可能な圧縮代が残っている状態であっても良い（不
図示）。First, as shown in FIG. 1A, the skin layer 3 is set and the molten resin 4 is injected with the mold cavity consisting of the movable mold 1 and the fixed mold 2 being incompletely closed. Alternatively, the molten resin 4 is injected and the skin layer 3 is set.
The incompletely closed state means the movable mold 1 as shown in FIG.
1 and the fixed die 2 is not limited to the completely separated state.
As described above, the movable die 1 and the fixed die 2 partially engage with each other, but the so-called parting surface may not engage with each other. Further, when the cavity is composed of a plurality of blocks, the parting surface engages with each other. May be in a state in which a compressible margin remains in some blocks (not shown).
【００２３】尚、キャビティを複数のブロックで構成す
るには、例えば可動型１と固定型２の少なくとも一方を
複数のブロックに分割すればよい。そして、各ブロック
毎に油圧機構やバネ機構等の開閉機構を備えることで、
各ブロック毎に段階的に閉じることができる。To configure the cavity with a plurality of blocks, for example, at least one of the movable die 1 and the fixed die 2 may be divided into a plurality of blocks. By providing each block with an opening / closing mechanism such as a hydraulic mechanism and a spring mechanism,
Each block can be closed in stages.
【００２４】表皮層３としては、織布、不織布、繊維、
紙、金属や熱可塑性樹脂及び熱可塑性エラストマーのシ
ートまたはフィルム等を用いることができる。また、ポ
リオレフィン系，ポリスチレン系，ポリ塩化ビニル系等
の熱可塑性樹脂製、ポリウレタン系等の熱硬化性樹脂製
あるいはゴム製の発泡体を用いることができる。さら
に、これらを単独でもしくは２種以上を積層して用いる
こともできる。As the skin layer 3, woven cloth, non-woven cloth, fiber,
Sheets or films of paper, metal, thermoplastic resin, and thermoplastic elastomer can be used. Further, a foam made of a thermoplastic resin such as a polyolefin type, a polystyrene type, a polyvinyl chloride type, a thermosetting resin such as a polyurethane type, or a rubber can be used. Furthermore, these may be used alone or in combination of two or more.
【００２５】溶融樹脂４の注入は、樹脂ノズル（不図
示）或は金型に設けた樹脂供給ライン（不図示）等から
行うが、特にその方法は限定されない。The molten resin 4 is injected from a resin nozzle (not shown) or a resin supply line (not shown) provided in the mold, but the method is not particularly limited.
【００２６】溶融樹脂４としては熱硬化性樹脂を用いる
こともできるが、熱可塑性樹脂が好ましく用いられる。
熱可塑性樹脂としては、例えば、ポリエチレン、ポリプ
ロピレン、ポリスチレン、ＡＢＳ樹脂、ＡＳ樹脂、ポリ
塩化ビニル、ポリアミド、ポリアセタール、ポリカーボ
ネイト、変性ポリフェニレンエーテル、ポリエチレンテ
レフタレート、ポリブチレンテレフタレート、ポリフェ
ニレンスルフィド、ポリイミド、ポリアミドイミド、ポ
リエーテルイミド、ポリアリレート、ポリサルフォン、
ポリエーテルサルフォン、ポリエーテルエーテルケト
ン、液晶ポリマー、テトラフルオロエチレン、熱可塑性
エラストマー等が挙げられる。さらには、これらの熱可
塑性樹脂の混合体や、耐熱性及び機械的強度をアップす
る目的で、無機及び／又は有機の充填材を配合した樹脂
を用いることもできる。Although a thermosetting resin can be used as the molten resin 4, a thermoplastic resin is preferably used.
Examples of the thermoplastic resin include polyethylene, polypropylene, polystyrene, ABS resin, AS resin, polyvinyl chloride, polyamide, polyacetal, polycarbonate, modified polyphenylene ether, polyethylene terephthalate, polybutylene terephthalate, polyphenylene sulfide, polyimide, polyamide imide, poly Ether imide, polyarylate, polysulfone,
Examples thereof include polyether sulfone, polyether ether ketone, liquid crystal polymer, tetrafluoroethylene, and thermoplastic elastomer. Further, a mixture of these thermoplastic resins or a resin containing an inorganic and / or organic filler may be used for the purpose of improving heat resistance and mechanical strength.
【００２７】金型キャビティ内に溶融樹脂４を注入した
後、図１（ｃ）のように金型キャビティは一段階閉じら
れる。そして、加圧ガス注入機構５により溶融樹脂４の
圧力に応じて比較的低圧に制御された加圧ガスを、ガス
注入口６より溶融樹脂４中に注入して、予備中空部７を
形成する。After injecting the molten resin 4 into the mold cavity, the mold cavity is closed by one step as shown in FIG. 1 (c). Then, the pressurized gas whose relatively low pressure is controlled by the pressurized gas injection mechanism 5 according to the pressure of the molten resin 4 is injected into the molten resin 4 through the gas injection port 6 to form the preliminary hollow portion 7. ..
【００２８】加圧ガスの注入を停止した後、図１（ｄ）
のように金型キャビティを完全に閉じる。この時、溶融
樹脂の量が多過ぎると、樹脂圧が必要以上に高くなり、
成形体に残留応力が発生したり、表皮層が潰れたりし好
ましくない。また、溶融樹脂の量が少な過ぎると、樹脂
層と表皮層との十分な接着性が得られない。このため、
溶融樹脂の量は、金型キャビティを完全に閉じた状態
で、ほぼ金型キャビティの容積から表皮層の容積を差し
引いた容積に見合う量であることが好ましい。After stopping the injection of the pressurized gas, FIG. 1 (d)
Completely close the mold cavity as shown in. At this time, if the amount of molten resin is too large, the resin pressure becomes higher than necessary,
Residual stress is generated in the molded body and the skin layer is crushed, which is not preferable. Moreover, if the amount of the molten resin is too small, sufficient adhesiveness between the resin layer and the skin layer cannot be obtained. For this reason,
It is preferable that the amount of the molten resin is an amount corresponding to the volume obtained by subtracting the volume of the skin layer from the volume of the mold cavity when the mold cavity is completely closed.
【００２９】そして、前記と同様にして溶融樹脂４の圧
力に応じて比較的高圧に制御された加圧ガスを溶融樹脂
４中の予備中空部７に注入して、最終的な中空部８を形
成する。Then, in the same manner as described above, a pressurized gas controlled to have a relatively high pressure in accordance with the pressure of the molten resin 4 is injected into the preliminary hollow portion 7 in the molten resin 4 to form the final hollow portion 8. Form.
【００３０】最後に、溶融樹脂４が冷却，固化された
後、樹脂中の加圧ガスを回収又は排出し、金型を開き、
樹脂層中に中空部８が形成された複層成形体を取り出
す。Finally, after the molten resin 4 is cooled and solidified, the pressurized gas in the resin is collected or discharged, the mold is opened,
The multi-layer molded body having the hollow portion 8 formed in the resin layer is taken out.
【００３１】溶融樹脂４中に注入する加圧ガスとして
は、成形の温度及び圧力下で、成形に用いる溶融樹脂と
反応又は混合されないものが使用される。例えば、窒
素、空気などが用いられるが、特に限定はされない。The pressurized gas injected into the molten resin 4 is one that does not react or mix with the molten resin used for molding under the molding temperature and pressure. For example, nitrogen, air, or the like is used, but it is not particularly limited.
【００３２】注入する加圧ガスの圧力は、通常１０〜３
５０Ｋｇ／ｃｍ2 程度であり、好ましくは３０〜３００
Ｋｇ／ｃｍ2 である。The pressure of the pressurized gas to be injected is usually 10 to 3
50 Kg / cm 2 or so, preferably 30 to 300
It is Kg / cm 2 .
【００３３】本例は金型キャビティを２段階に閉じる例
であるが、本発明においてはこの段数に特に制限はな
く、最終的な成形体の大きさや形状等により適宜決めら
れるものである。This example is an example in which the mold cavity is closed in two steps, but the number of steps is not particularly limited in the present invention, and it is appropriately determined depending on the size and shape of the final molded product.
【００３４】金型キャビティを３段階以上に閉じる場合
には、予備中空部７の形成を段階的に行うこともでき
る。例えば金型キャビティを３段階に閉じ、第一の段階
で第一段階予備中空部を形成した後、第二の段階でこれ
とは別の新たな予備中空部を形成したり、第一段階予備
中空部に加圧ガスを注入して第二段階予備中空部を形成
してもよい。このような場合においても、金型キャビテ
ィを完全に閉じた段階で、これらの予備中空部に加圧ガ
スを注入して、最終的な中空部８を形成する。When the mold cavity is closed in three steps or more, the preliminary hollow portion 7 can be formed stepwise. For example, the mold cavity is closed in three stages, and the first stage preliminary hollow part is formed in the first stage, and then a new preliminary hollow part different from this is formed in the second stage, or the first stage preliminary hollow part is formed. A second stage preliminary hollow portion may be formed by injecting a pressurized gas into the hollow portion. Even in such a case, when the mold cavity is completely closed, a pressurized gas is injected into these preliminary hollow portions to form the final hollow portion 8.
【００３５】加圧ガスの圧力を各段階における溶融樹脂
４の圧力に応じて制御する方法としては、例えば、圧縮
状態にある溶融樹脂４の圧力を金型面に設けた圧力検出
器で検出し、これを直ちに加圧ガス注入機構５にフィー
ドバックし、該機構内に設けられている圧力調節弁（不
図示）の開閉を調節することで、溶融樹脂４の圧力に対
して予め決められた圧力となるように加圧ガスの圧力を
制御することができる。あるいは金型キャビティの容量
と注入される溶融樹脂量との関係から、可動型１の移動
量と加圧ガスの圧力との対応を予め決めておき、該移動
量をフィードバックすることによって同様に制御するこ
ともできる。As a method of controlling the pressure of the pressurized gas in accordance with the pressure of the molten resin 4 at each stage, for example, the pressure of the molten resin 4 in the compressed state is detected by a pressure detector provided on the mold surface. By immediately feeding this back to the pressurized gas injection mechanism 5 and adjusting the opening / closing of a pressure control valve (not shown) provided in the mechanism, a predetermined pressure with respect to the pressure of the molten resin 4 can be obtained. The pressure of the pressurized gas can be controlled so that Alternatively, based on the relationship between the capacity of the mold cavity and the amount of injected molten resin, the correspondence between the moving amount of the movable mold 1 and the pressure of the pressurized gas is determined in advance, and the moving amount is fed back to perform similar control. You can also do it.
【００３６】[0036]
【発明の効果】以上説明したように、スタンピングある
いは圧縮成形方法を応用し、更に中空射出成形方法を組
み合わせた本発明の成形方法においては、溶融樹脂中へ
の加圧ガスの注入を極めて容易に良好な状態で行うこと
ができ、中空部の大きさや形状を制御して不必要な部位
に中空が形成されるのを防止することができる。このた
め、“ひけ”や変形を防止し更なる外観の向上が成され
ると共に、不必要な部位に中空部が形成されることによ
る強度低下を防止することができる。As described above, in the molding method of the present invention in which the stamping or compression molding method is applied and the hollow injection molding method is combined, it is extremely easy to inject the pressurized gas into the molten resin. It can be performed in a good state, and the size and shape of the hollow portion can be controlled to prevent the hollow portion from being formed in an unnecessary portion. Therefore, it is possible to prevent "sinking" and deformation and further improve the appearance, and it is possible to prevent a decrease in strength due to the formation of a hollow portion in an unnecessary portion.
【００３７】また、加圧成形の最終段階で金型を開くこ
ともないため、型再現性に優れ精密部品の成形にも十分
に対応することができる。Further, since the mold is not opened at the final stage of the pressure molding, the mold reproducibility is excellent and it is possible to sufficiently cope with the molding of precision parts.
【図１】本発明の一実施例の工程を説明するための図で
ある。FIG. 1 is a diagram for explaining a process of one embodiment of the present invention.
１ 可動型 ２ 固定型 ３ 表皮層 ４ 溶融樹脂 ５ 加圧ガス注入機構 ６ ガス注入口 ７ 予備中空部 ８ 中空部 1 Movable type 2 Fixed type 3 Skin layer 4 Molten resin 5 Pressurized gas injection mechanism 6 Gas injection port 7 Spare hollow part 8 Hollow part
Claims (2)
層成形体の成形方法において、 表皮層を配置、溶融樹脂を注入した不完全に閉じた状態
の金型キャビティを段階的に閉じ、金型キャビティが不
完全に閉じている段階で溶融樹脂中に加圧ガスを注入し
て予備中空部を形成し、金型キャビティを完全に閉じた
段階で予備中空部に更に加圧ガスを注入することを特徴
とする複層成形体の成形方法。1. A method for molding a multilayer molded body comprising at least a resin layer and a skin layer, wherein a skin layer is arranged, and a mold cavity filled with a molten resin and incompletely closed is closed in stages. When the mold cavity is incompletely closed, pressurized gas is injected into the molten resin to form a preliminary hollow part, and when the mold cavity is completely closed, further pressurized gas is injected into the preliminary hollow part. A method for molding a multi-layer molded body, comprising:
を、各段階における溶融樹脂の圧力に応じて制御するこ
とを特徴とする請求項１に記載の複層成形体の成形方
法。2. The method for molding a multilayer molded article according to claim 1, wherein the pressure of the pressurized gas injected into the molten resin is controlled according to the pressure of the molten resin in each stage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11339094A JP3574174B2 (en) | 1994-05-02 | 1994-05-02 | Molding method of multilayer molded body |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11339094A JP3574174B2 (en) | 1994-05-02 | 1994-05-02 | Molding method of multilayer molded body |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH07299841A true JPH07299841A (en) | 1995-11-14 |
| JP3574174B2 JP3574174B2 (en) | 2004-10-06 |
Family
ID=14611106
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11339094A Expired - Lifetime JP3574174B2 (en) | 1994-05-02 | 1994-05-02 | Molding method of multilayer molded body |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3574174B2 (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0729820A1 (en) * | 1995-03-03 | 1996-09-04 | Sumitomo Chemical Company Limited | Mold for production of hollow thermoplastic resin molded article, and process for production of hollow thermoplastic resin molded article using the same |
| WO2000056517A1 (en) * | 1999-03-23 | 2000-09-28 | Rhodia Engineering Plastics S.A. | Mixed articles comprising a rigid part and a part based on a thermoplastic material |
| FR2791297A1 (en) * | 1999-03-23 | 2000-09-29 | Rhodia Engineering Plastics Sa | Article for use in buildings, furniture, vehicles, consumer goods, etc has elongate rigid element whose profile has concave part in line contact with thermoplastic element(s) |
| JP2009297960A (en) * | 2008-06-11 | 2009-12-24 | Faltec Co Ltd | Method for manufacturing synthetic resin molded article and mold device |
| JP2016028890A (en) * | 2014-07-18 | 2016-03-03 | 太平洋通商株式会社 | Housing frame production method and housing frame |
-
1994
- 1994-05-02 JP JP11339094A patent/JP3574174B2/en not_active Expired - Lifetime
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0729820A1 (en) * | 1995-03-03 | 1996-09-04 | Sumitomo Chemical Company Limited | Mold for production of hollow thermoplastic resin molded article, and process for production of hollow thermoplastic resin molded article using the same |
| US6106260A (en) * | 1995-03-03 | 2000-08-22 | Sumitomo Chemical Company, Limited | Mold useful in the production of hollow thermoplastic molded articles |
| US6506335B1 (en) | 1995-03-03 | 2003-01-14 | Sumitomo Chemical Company, Limited | Mold for production of hollow thermoplastic resin molded article, and process for production of hollow thermoplastic resin molded article using the same |
| WO2000056517A1 (en) * | 1999-03-23 | 2000-09-28 | Rhodia Engineering Plastics S.A. | Mixed articles comprising a rigid part and a part based on a thermoplastic material |
| FR2791297A1 (en) * | 1999-03-23 | 2000-09-29 | Rhodia Engineering Plastics Sa | Article for use in buildings, furniture, vehicles, consumer goods, etc has elongate rigid element whose profile has concave part in line contact with thermoplastic element(s) |
| US6858276B1 (en) | 1999-03-23 | 2005-02-22 | Rhodia Engineering Plastics S.A. | Mixed articles comprising a rigid part and a based on a thermoplastic material |
| JP2009297960A (en) * | 2008-06-11 | 2009-12-24 | Faltec Co Ltd | Method for manufacturing synthetic resin molded article and mold device |
| JP2016028890A (en) * | 2014-07-18 | 2016-03-03 | 太平洋通商株式会社 | Housing frame production method and housing frame |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3574174B2 (en) | 2004-10-06 |
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