JP4489751B2 - Manufacturing method of RIM molded product - Google Patents
Manufacturing method of RIM molded product Download PDFInfo
- Publication number
- JP4489751B2 JP4489751B2 JP2006339326A JP2006339326A JP4489751B2 JP 4489751 B2 JP4489751 B2 JP 4489751B2 JP 2006339326 A JP2006339326 A JP 2006339326A JP 2006339326 A JP2006339326 A JP 2006339326A JP 4489751 B2 JP4489751 B2 JP 4489751B2
- Authority
- JP
- Japan
- Prior art keywords
- molding material
- skin layer
- forming
- inner layer
- component
- 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
Description
本発明は、従来のフロンガスに依存しないで、また簡易な装置を用いてフロンガスを発泡剤として使用した場合と同品質の緻密な表皮層と発泡内部層を有する成形品の製造方法に関する。 The present invention relates to a method for producing a molded product having a dense skin layer and a foamed inner layer that are the same quality as when a Freon gas is used as a foaming agent using a simple apparatus without relying on conventional freon gas.
従来、ＲＩＭ成形において、表皮層を持ったポリウレタン成形品を製造する技術としては、発泡剤にフロンやペンタンなどの炭化水素を用いてインテグラルスキン層を形成する方法があるが、地球環境保全あるいは発火性の問題が懸念される。また、発泡剤に水などを用い炭酸ガスを反応により発生して表皮層を形成することも可能であるが、その表皮層は緻密でなく、泡が多く含まれるためピンホールが見られるなど外観が悪化するので、この欠陥を繕うため表皮層の上を更に革巻きしたりあるいはインモールドコートするなどの手当が必要となる。 Conventionally, as a technique for producing a polyurethane molded article having a skin layer in RIM molding, there is a method of forming an integral skin layer using a hydrocarbon such as chlorofluorocarbon or pentane as a foaming agent. There are concerns about ignitability issues. In addition, it is possible to generate carbon dioxide by reaction using water as a foaming agent to form a skin layer, but the skin layer is not dense and contains many bubbles, so that pinholes can be seen. Therefore, in order to repair this defect, it is necessary to take further care such as further winding the leather on the skin layer or in-mold coating.
前記のように、ポリウレタン原料の発泡反応で表皮層を形成する他に、あらかじめＲＩＭ成形工程の前に、表皮層を金型キャビティ面に塗装などの方法で形成したり、表皮材をインサートしておいてその後にＲＩＭ成形にて内部層を形成する方法や、あらかじめ内部層を形成しておいてこれをキャビティ内にインサートして、表皮層をＲＩＭ成形する方法もある。 As described above, in addition to forming the skin layer by foaming reaction of polyurethane raw material, before the RIM molding process, the skin layer is formed on the mold cavity surface by a method such as painting, or the skin material is inserted. Then, there are a method of forming an inner layer by RIM molding after that, and a method of forming an inner layer in advance and inserting it into a cavity to RIM molding the skin layer.
また、特許文献１に記載されているように、金型を減圧下に保持し、はじめに表皮層を形成するポリウレタン成形材料を少量注入し、金型キャビティ内の減圧による材料飛散で金型キャビティ内に薄膜状に表皮層を形成し、その後、内部用のポリウレタン成形材料を注入して発泡、硬化し表皮層を有する成形品を得る方法もあるが、金型全体を減圧状態にするための構造が必要で、減圧設備の導入も必要となり、工数の増加や減圧の制御が必要となる。
本発明の目的は、上記従来までの技術が抱えていた問題点を解決し、発泡剤として、フロンを使用せずに、緻密な表皮層と発泡した内部層を有する成形品を、減圧設備などを有しない簡易な装置を用いて、低コストで製造する方法を提供することにある。 The object of the present invention is to solve the above-mentioned problems of the prior art, and to form a molded article having a dense skin layer and a foamed inner layer without using chlorofluorocarbon as a foaming agent, etc. An object of the present invention is to provide a method for manufacturing at low cost using a simple apparatus that does not have any.
本発明者は、鋭意検討した結果、金型キャビティ内に２段階でポリウレタン成形材料を注入すること、１段目は表皮層を形成するための成形材料を、次いでその成形材料の内部に発泡内部層を形成するための成形材料を注入して、ＲＩＭ成形することが有効であることを見出し、本発明に至った。
すなわち、本発明は、
（１）常圧下の金型キャビティ内に表皮層形成用の発泡剤を配合しないポリウレタン成形材料を注入し、次いでこのポリウレタン成形材料内部に、瞬時に発泡する発泡内部層形成用ポリウレタン成形材料を金型キャビティ内を完全に充填するまで注入して成形するＲＩＭ成形品の製造方法、
（２）表皮層形成用ポリウレタン成形材料の粘度と瞬時に発泡する発泡内部層形成用ポリウレタン成形材料の粘度を調整して表皮層の厚みをコントロールする前記（１）記載のＲＩＭ成形品の製造方法、
（３）瞬時に発泡する発泡内部層形成用ポリウレタン成形材料は、ミキシングヘッドおよび／またはミキシングヘッドに通じる配管中で気体を吹き込まれる前記（１）または（２）記載のＲＩＭ成形品の製造方法、に関する。
As a result of intensive studies, the inventor has injected polyurethane molding material into the mold cavity in two stages, the first stage is a molding material for forming the skin layer, and then the foaming interior is formed inside the molding material. It has been found that it is effective to inject a molding material for forming a layer and perform RIM molding, and the present invention has been achieved.
That is, the present invention
(1) A polyurethane molding material that does not contain a foaming agent for forming a skin layer is injected into a mold cavity under normal pressure, and then the polyurethane molding material for forming a foamed inner layer that instantly foams is injected into the polyurethane molding material. A method of manufacturing a RIM molded product, which is injected and molded until the inside of the mold cavity is completely filled;
(2) The method for producing a RIM molded article according to (1), wherein the thickness of the skin layer is controlled by adjusting the viscosity of the polyurethane molding material for forming the skin layer and the viscosity of the polyurethane molding material for forming the foamed inner layer that instantly foams. ,
(3) The polyurethane molding material for forming a foamed inner layer that instantaneously foams is a method for producing a RIM molded article according to (1) or (2), wherein a gas is blown into a mixing head and / or a pipe leading to the mixing head, About.
以上説明したように、本発明の方法によれば、フロンガスを使用することなく、フロンガスを使用した場合に劣らない緻密な表皮層と内部の発泡内部層を有する見栄えのよい成形品を製造することができる。また、その表皮層の厚みを使用する成形材料の粘度を調整することにより容易にコントロールすることができる。しかも、本発明の方法は成形を常圧下に行うので、従来のように金型に減圧装置を要することなく、簡易な装置を使用することができる。 As described above, according to the method of the present invention, it is possible to produce a good-looking molded article having a dense skin layer and an internal foamed inner layer that is not inferior to the case of using Freon gas, without using Freon gas. Can do. Further, the thickness of the skin layer can be easily controlled by adjusting the viscosity of the molding material that uses it. In addition, since the molding of the present invention is performed under normal pressure, a simple apparatus can be used without requiring a pressure reducing apparatus in the mold as in the prior art.
本発明においては、最初に常圧下の金型キャビティ内に発泡剤を含まない表皮層形成用ポリウレタン成形材料を注入してキャビティ内部の一部を満たし、この成形材料が硬化完了する前に、直ちにこの成形材料の内部に発泡内部層形成用の成形材料を注入して金型キャビティ内に完全に充填させてＲＩＭ成形することが重要である。この場合において、表皮層形成用ポリウレタン成形材料の注入の後期では、その成形材料の注入が完了する前に発泡内部層形成用ポリウレタン成形材料も同時に注入することもできる。要は、発泡剤を含まない緻密な表皮層とその内部の発泡内部層とが一体化した成形品を形成できるようなタイミングで、発泡内部層成型用材料を注入することが好ましい。
また、その発泡内部層形成用ポリウレタン成形材料にはあらかじめ加圧下に気体を混合しておくことも重要である。発泡内部層形成用の成形材料を表皮層形成用の成形材料の内部に充填するには、ゲート部を金型キャビティの下側に配設したキャビティ内の下部に表皮層形成用の成形材料を充填してそのキャビティ領域を満たし、硬化完了前の表皮層形成用成形材料の中に発泡内部層成形材料を充填することによって、容易に行うことができる。
In the present invention, first, a polyurethane molding material for forming a skin layer that does not contain a foaming agent is injected into a mold cavity under normal pressure to fill a part inside the cavity, and immediately before the molding material is completely cured, It is important to inject the molding material for forming the foamed inner layer into the molding material to completely fill the mold cavity and perform RIM molding. In this case, in the latter stage of the injection of the skin layer forming polyurethane molding material, the foamed inner layer forming polyurethane molding material can also be injected at the same time before the injection of the molding material is completed. In short, it is preferable to inject the foamed inner layer molding material at such a timing that a molded product in which the dense skin layer not containing the foaming agent and the foamed inner layer therein are integrated can be formed.
It is also important to previously mix a gas under pressure in the polyurethane molding material for forming the foamed inner layer. In order to fill the molding material for forming the foam inner layer into the molding material for forming the skin layer, the molding material for forming the skin layer is placed in the lower part of the cavity where the gate portion is disposed below the mold cavity. It can be easily performed by filling the cavity region and filling the foamed inner layer molding material into the molding material for forming the skin layer before the completion of curing.
発泡内部層形成用ポリウレタン成形材料がキャビティ内に注入された時、その中にあらかじめ加圧下に混合され、成形材料中に溶解、あるいは分散されていた気体が瞬時に発泡し、成形材料をクリーム状態にする。このクリーム状態のコア材料が最初にキャビティ内に充填されていた表皮層形成用ポリウレタン成形材料の内部に入り、表皮層形成材料を押し上げながら、キャビティ内を満たしていくのである。こうしてＲＩＭ成形を行うことにより緻密な表皮層とその内部の発泡内部層からなる成形品を製造することができる。本発明による成形品は、その表面にボイドやピンホールの発生は見られず、優れた外観を持つ緻密な表皮層とクッション性のよい発泡内部層からなる。 When the polyurethane molding material for forming the foamed inner layer is injected into the cavity, the gas that has been mixed under pressure in advance and dissolved or dispersed in the molding material instantly foams, and the molding material is in a cream state To. This creamy core material enters the skin layer-forming polyurethane molding material initially filled in the cavity, and fills the cavity while pushing up the skin layer-forming material. By performing RIM molding in this way, a molded product comprising a dense skin layer and an internal foamed inner layer can be produced. The molded product according to the present invention is formed of a dense skin layer having an excellent appearance and a foamed inner layer having good cushioning properties, with no occurrence of voids or pinholes on the surface thereof.
本発明に使用するポリウレタン成形材料自体は、特に制限はなく、一般的にＲＩＭ成形に使用されるポリウレタン成形材料を使用することができる。
本発明において、表皮層のウレタン材を注入した後、内部層の瞬時に発泡するウレタン材に切り替えて金型キャビディー内に注入する方法、あるいは表皮層形成用ポリウレタン成形材料を注入し、この成形材料と同時に内部層の瞬時に発泡するウレタン材を金型キャビティー内に注入する方法としては、とくに制限するものではないが、好ましい方法について述べると次のような方法がある。
The polyurethane molding material itself used in the present invention is not particularly limited, and a polyurethane molding material generally used for RIM molding can be used.
In the present invention, after injecting the urethane material of the skin layer, it is switched to the urethane material that instantaneously foams in the inner layer and injecting into the mold cavity, or the polyurethane molding material for forming the skin layer is injected, and this molding The method for injecting the urethane material that instantly foams into the mold cavity simultaneously with the material is not particularly limited, but a preferred method is as follows.
（１）三成分ミキシングヘッドを使用し、ひとつの成分は発泡剤を配合しないポリオール成分とし、二つ目の成分を炭酸ガス、窒素ガスなどをローディングしたポリオール成分とし、三つ目の成分をイソシアネート成分とする。そこで、まず一つ目のポリオール成分と三つ目の成分をミキシングヘッドから吐出し、二つ目の成分は吐出しないようにポンプを止め、バルブを閉めておく。その後直ちに二つ目の成分のポンプを作動しバルブを開けて三成分を同時に吐出する。この場合、各成分のポンプの吐出能力が異なることや最初に吐出する表皮層と後で吐出する内部層ウレタン材のポリオールとイソシアネートの配合比率を変化できるように三つ目の成分のイソシアネートのポンプは、切り替えスイッチによりポンプインバーターを２段階に切り替えられるようにする。又、吐出時間もその切り替えスイッチと連動して２つのタイマー設定ができるようにする。 (1) Using a three-component mixing head, one component is a polyol component that does not contain a blowing agent, the second component is a polyol component loaded with carbon dioxide, nitrogen gas, etc., and the third component is an isocyanate. Ingredients. Therefore, first, the first polyol component and the third component are discharged from the mixing head, the pump is stopped so that the second component is not discharged, and the valve is closed. Immediately after that, the pump of the second component is operated and the valve is opened to discharge the three components simultaneously. In this case, the third component isocyanate pump so that the discharge capacity of the pump of each component is different and the blending ratio of the polyol and isocyanate of the outer layer urethane material discharged first and the inner layer urethane material discharged later can be changed. Makes it possible to switch the pump inverter in two stages by a changeover switch. Also, the discharge time can be set to two timers in conjunction with the changeover switch.
（２）多成分ミキシングヘッドを使う場合は、ポリオール成分を２系統とし、イソシアネート成分を２系統とし、任意に配合比率と注入時間を変更することで容易に表皮層と内部層のウレタン材を吐出することが可能となる。
（３）イソシアネートを１系統しか持たない多成分ミキシングヘッドにおいては、あらかじめイソシアネート成分と各ポリオール成分をそれぞれ２成分ずつ吐出するようにすることで、容易に表皮層と内部層のウレタン材を吐出することが可能となる。
一般に、上記（１）〜（３）の場合には、内部層ウレタン材に発泡剤である二酸化炭素、窒素、空気などの気体をあらかじめ内部層形成用ポリウレタン成形材料ポリオールとタンク内で混合しておくことが可能である。このように加圧タンクを使用する場合においては、注入ガスを安定化することができる。
更に、ミキシングヘッドもしくはミキシングヘッドに原料が流れる配管の途中で炭酸ガスなどの発泡ガスを配合するような場合では、次のような方法を採用すれば可能となる。なお、このガス混合法によるときは、注入ガス量を容易にコントロールすることができる。
(2) When using a multi-component mixing head, the polyol component has two systems and the isocyanate component has two systems, and the urethane material of the skin layer and the inner layer can be easily discharged by arbitrarily changing the blending ratio and injection time. It becomes possible to do.
(3) In a multi-component mixing head having only one system of isocyanate, the urethane material of the skin layer and the inner layer can be easily discharged by discharging each of the isocyanate component and each polyol component in advance. It becomes possible.
Generally, in the case of the above (1) to (3), a gas such as carbon dioxide, nitrogen, air, etc., which is a foaming agent, is mixed in advance with a polyurethane molding material polyol for forming an inner layer in a tank. It is possible to leave. Thus, when using a pressurized tank, injection gas can be stabilized.
Furthermore, in the case where a foaming gas such as carbon dioxide gas is blended in the middle of the mixing head or the pipe through which the raw material flows, the following method can be used. When this gas mixing method is used, the amount of injected gas can be easily controlled.
（４）３成分ミキシングヘッドで、１つ目の成分は炭酸ガスなどの発泡ガスを注入できる場合は、２つ目の成分を発泡剤を配合しないポリオール成分とし、３つ目の成分をイソシアネート成分として、まず、１つ目の成分の吐出を閉じて、２つ目の成分と３つ目の成分を吐出し、その後直ちに１つ目の成分の吐出を開き、３成分を同時に吐出することで、容易に表皮層と内部層のウレタン材を吐出することが可能となる。 (4) In the case of a three-component mixing head, when the first component can inject a foaming gas such as carbon dioxide, the second component is a polyol component that does not contain a blowing agent, and the third component is an isocyanate component. First, the discharge of the first component is closed, the second component and the third component are discharged, the discharge of the first component is immediately opened, and the three components are discharged simultaneously. It becomes possible to easily discharge the urethane material of the skin layer and the inner layer.
（５）２成分ミキシングヘッドを使う場合、ウレタン材料がミキシングヘッドに流れる配管の途中に、無数の微小のポーラス穴を持った第３成分の混入口を設置し、第３成分に炭酸ガスなどの発泡ガスを液体状で接続できるようにし、まず、第３成分のバルブを閉じ、１つ目の成分の発泡剤を配合しないポリオール成分と２つ目の成分のイソシアネートを吐出し、その後直ちに第３成分のバルブを開けて全ての成分を吐出する。 (5) When using a two-component mixing head, install a third component inlet with countless minute porous holes in the middle of the piping through which urethane material flows to the mixing head. First, the third component valve is closed and the polyol component not containing the first component blowing agent and the second component isocyanate are discharged, and then the third component is immediately discharged. Open the component valve to discharge all components.
（６）（４）及び（５）においては、２回の吐出で行ったが、１回の吐出で行う場合は、炭酸ガスなどの発泡ガスの混入をタイマーを設置し、バルブの開閉を制御して、ポリオール成分とイソシアネート成分の吐出に対し、時間差をつけてバルブを開くことで、２回の吐出を、１回の吐出の工程の中で行うことができる。 (6) In (4) and (5), the discharge was performed twice. However, in the case of a single discharge, a timer is installed to mix the foaming gas such as carbon dioxide and the opening and closing of the valve is controlled. Then, by discharging the polyol component and the isocyanate component by opening a valve with a time difference, two discharges can be performed in one discharge process.
本発明の方法によれば、表皮層と内部層を任意に特性を変化させた、ウレタンＲＩＭ成形品を、通常のＲＩＭ機を使うか、簡単な設備改造により、設備費をかけずに、常圧下で行うことにより、金型の改造もなく、容易に作ることが可能となる。
また、本発明において加圧下にポリウレタン成形材料に混合する気体としては炭酸ガス、窒素ガス、空気などが挙げられる。その加圧は、常圧下の金型内で瞬時に発泡して内部内部層を緻密な表皮層とともに形成できる圧力であれば特に制限はないが、必要設備のコストなどを考慮すると１〜５ｋｇ/ｃｍ２が好ましい。
According to the method of the present invention, a urethane RIM molded product in which the characteristics of the skin layer and the inner layer are arbitrarily changed can be used without using equipment costs by using a normal RIM machine or by simple equipment modification. By carrying out the reduction, the mold can be easily made without remodeling.
In the present invention, examples of the gas mixed with the polyurethane molding material under pressure include carbon dioxide, nitrogen gas, and air. The pressurization is not particularly limited as long as it is a pressure that can be instantaneously foamed in a mold under normal pressure to form an inner inner layer together with a dense skin layer, but considering the cost of necessary equipment, 1 to 5 kg / cm 2 is preferred.
本発明においては、表皮層用ウレタン材料と内部層用ウレタン材料の特性をそれぞれ変化させることが可能である。特に表皮層用ウレタン材の粘度を２００ＣＰＳから１０００ＣＰＳの範囲内で、また内部用ウレタン材の粘度は１００ＣＰＳから６００ＣＰＳの範囲内で使用することができる。表皮層形成用の成形材料の粘度が２００ＣＰＳよりも低いと表皮層が薄くなりすぎて、破れが生じたりして満足な表皮層が形成できなかったり、ゲート側が薄く、オーバーフロー側が厚くなり均一な表皮層が形成できない。また、１０００ＣＰＳを越える粘度では粘性が高すぎて流動性が悪くなり、内部層用ウレタン材料によって表皮層が破れてしまうなどの問題が生じることとなる。好ましい表皮層形成用の成形材料の粘度は４００〜６００ＣＰＳである。内部用ポリウレタン成形材料の粘度が１００ＣＰＳより低いと内部層に表皮層が混ざってしまい、また６００ＣＰＳを越えると発泡が不充分となるなどの問題が生じることとなる。好ましい内部用ポリウレタン成形材料の粘度は３００〜４００ＣＰＳである。そして両層の粘度差を調整することにより、成形品の表皮層の厚さを変化させたものを作ることが可能になる。また、表皮層用ウレタン材に塗料などに使われる無黄変タイプのイソシアネートを使うことで、耐久性の良い表皮層を付与した成形品を作ることが可能になる。発泡剤の配合量を変化させ、表皮層と内部層のウレタン材の硬度を変化させることで、感触を変更することも可能になる。 In the present invention, it is possible to change the properties of the urethane material for the skin layer and the urethane material for the inner layer. In particular, the viscosity of the urethane material for the skin layer can be used in the range of 200 CPS to 1000 CPS, and the viscosity of the urethane material for the internal layer can be used in the range of 100 CPS to 600 CPS. When the viscosity of the molding material for forming the skin layer is lower than 200 CPS, the skin layer becomes too thin and tearing occurs, so that a satisfactory skin layer cannot be formed, or the gate side is thin and the overflow side is thick, resulting in a uniform skin A layer cannot be formed. On the other hand, when the viscosity exceeds 1000 CPS, the viscosity is too high, the fluidity is deteriorated, and the skin layer is broken by the urethane material for the inner layer. A preferable viscosity of the molding material for forming the skin layer is 400 to 600 CPS. When the viscosity of the polyurethane molding material for internal use is lower than 100 CPS, the skin layer is mixed with the internal layer, and when it exceeds 600 CPS, problems such as insufficient foaming occur. A preferred internal polyurethane molding material has a viscosity of 300 to 400 CPS. And by adjusting the difference in viscosity between the two layers, it is possible to make a product in which the thickness of the skin layer of the molded product is changed. In addition, by using a non-yellowing type isocyanate used for paints or the like as the urethane material for the skin layer, it becomes possible to produce a molded article having a durable skin layer. It is also possible to change the feel by changing the blending amount of the foaming agent and changing the hardness of the urethane material in the skin layer and the inner layer.
表皮層（スキン層）の厚さを制御する方法としては、すでに述べたように、ａ）表皮層用材料の粘度と内部層（内部層）用材料の粘度とを調整することで表皮層の膜厚を容易に制御できる。
・表皮層の粘度＞内部層の粘度とすることで、表皮層を厚くできる。
・表皮層の粘度＜内部層の粘度とすることで、表皮層を薄くできる。
また、ｂ）表皮層用材料のキャビティへの注入量を増減する。表皮層用材料の注入量を増やすと表皮層を厚くでき、減らすと表皮層を薄くできる。
As described above, as a method for controlling the thickness of the skin layer (skin layer), a) adjusting the viscosity of the material for the skin layer and the viscosity of the material for the inner layer (inner layer), The film thickness can be easily controlled.
-By making the viscosity of the skin layer> the viscosity of the inner layer, the skin layer can be thickened.
・ By making the viscosity of the skin layer <the viscosity of the inner layer, the skin layer can be made thinner.
B) The amount of skin layer material injected into the cavity is increased or decreased. Increasing the injection amount of the material for the skin layer can make the skin layer thicker, and decreasing it can make the skin layer thinner.
以下、本発明をステアリングホイールのウレタンＲＩＭ成形に具体化した実施例について図１〜図９に基づいて説明する。本発明で使う装置は、常圧下に置かれた成形金型１、ウレタン材料を混合攪拌し吐出するための３成分ミキシングヘッド３、ステアリングホイールの芯金６等から構成されており、３成分ミキシングヘッド３には、ポリオール成分とイソシアネート成分がそれぞれミキシングヘッドに送り込む配管１３、１４、１５がほどこされている。また、常圧下に置かれた金型１には、ミキシングヘッド３から吐出したウレタン材料４を金型３まで流し込むアフターミキサー１１とキャビティー２をウレタン材料で過充填したときに金型１内のエアーと過剰のウレタン材を抜くべントホール１２がほどこされている。 Hereinafter, an embodiment in which the present invention is embodied in urethane RIM molding of a steering wheel will be described with reference to FIGS. The apparatus used in the present invention is composed of a molding die 1 placed under normal pressure, a three-component mixing head 3 for mixing and stirring and discharging urethane material, a core 6 for a steering wheel, and the like. The head 3 is provided with pipes 13, 14, and 15 for feeding the polyol component and the isocyanate component to the mixing head, respectively. Further, in the mold 1 placed under normal pressure, the after-mixer 11 into which the urethane material 4 discharged from the mixing head 3 is poured into the mold 3 and the cavity 2 are overfilled with the urethane material. A vent hole 12 for removing air and excess urethane material is provided.
上記製造装置を使用して行う本実施例の表皮層と内部層を形成したウレタンＲＩＭ成形方法について工程順に説明する。
１）ゲート側を下側に設置した成形用金型１をコア型とキャビ型に型開きし、離型剤を両型に塗布する。
２）コア型に芯金６をセットした後、コア型とキャビ型を型閉めする。図１がその投影図で、図２がその断面図となる。
３）図１及び図２に示すように、配管１３から発泡剤を配合していないポリオール成分と配管１４からイソシアネート成分をミキシングヘッド３で混合攪拌してそのウレタン材料４を金型１のキャビティー内に任意の量を流し込む（実施例ではキャビティ体積の約１／３の量）。
The urethane RIM molding method in which the skin layer and the inner layer of the present embodiment are formed using the above manufacturing apparatus will be described in the order of steps.
1) Open the molding die 1 with the gate side on the lower side into a core mold and a cavity mold, and apply a release agent to both molds.
2) After setting the cored bar 6 to the core mold, the core mold and the cavity mold are closed. FIG. 1 is a projection view thereof, and FIG. 2 is a sectional view thereof.
3) As shown in FIG. 1 and FIG. 2, a polyol component not containing a foaming agent from the pipe 13 and an isocyanate component from the pipe 14 are mixed and stirred by the mixing head 3 to mix the urethane material 4 into the cavity of the mold 1. An arbitrary amount is poured into the inside (in the embodiment, about 1/3 of the cavity volume).
４）その後、直ちに配管１５を開きあらかじめ加圧下に（実施例では３ｋｇ/ｃｍ２）炭酸ガスなどを吹き込んだ金型内で瞬時に発泡するポリオール成分をミキシングヘッド３から吐出して、連続して３成分全てのポリウレタン成形材料１０を金型キャビティ２の中のポリウレタン成形材料４の中に吐出する。このポリウレタン成形材料１０は、図３及び図４の充填完了寸前の状態から、図５及び図６のベントホール１２からポリウレタン成形材料がオーバーフローするまで充填する。 4) Thereafter, the pipe 15 is immediately opened, and a polyol component that instantly foams in a mold blown with carbon dioxide gas under pressure (3 kg / cm 2 in the example) is discharged from the mixing head 3 continuously. All the three component polyurethane molding materials 10 are discharged into the polyurethane molding material 4 in the mold cavity 2. The polyurethane molding material 10 is filled from the state immediately before the completion of filling in FIGS. 3 and 4 until the polyurethane molding material overflows from the vent hole 12 in FIGS. 5 and 6.
図７から図９は、金型キャビティ内のゲート側位置８とオーバーフロー側位置９におけるポリウレタン成形材料の充填状態を示す説明図である。図７は、発泡剤を配合していないポリウレタン成形材料４を金型キャビティー２に吐出した状態、図８は、後から瞬時に発泡するポリウレタン成形材料１０によりキャビティ内を完全に満たす寸前の状態、図９は、オーバーフローするポリウレタン成形材料７が出るまでポリウレタン成形材料１０を吐出した状態のステアリングホイールのグリップ８と９の部分の断面を説明する図であって、各図の左側がオーバーフロー側、右側がゲート側である。 FIG. 7 to FIG. 9 are explanatory views showing a filling state of the polyurethane molding material at the gate side position 8 and the overflow side position 9 in the mold cavity. FIG. 7 shows a state in which the polyurethane molding material 4 not containing a foaming agent is discharged into the mold cavity 2, and FIG. 8 shows a state just before the inside of the cavity is completely filled with the polyurethane molding material 10 that instantly foams later. FIG. 9 is a diagram for explaining a cross section of the steering wheel grips 8 and 9 in a state in which the polyurethane molding material 10 is discharged until the overflowing polyurethane molding material 7 comes out, and the left side of each figure is the overflow side, The right side is the gate side.
図１０に示す写真は、本実施例で作製したステアリングホイールの試作品サンプルで、右側が芯金６をセットしないで成型したグリップ９の断面写真、左側が芯金６をセットしたグリップ９の断面写真で、最初に吐出したウレタン材料４は、粘度６００ＣＰＳで、後から吐出したウレタン材１０の粘度は４００ＣＰＳの条件で試作を行ったものである。断面が白く見える部分が表皮層、内部の黒く見える部分が発泡内部層である。 The photograph shown in FIG. 10 is a prototype sample of the steering wheel produced in this example, the right side is a cross-sectional photograph of the grip 9 molded without setting the cored bar 6, and the left side is a cross-section of the grip 9 set with the cored bar 6. In the photograph, the urethane material 4 discharged first has a viscosity of 600 CPS, and the viscosity of the urethane material 10 discharged later is 400 CPS. The part where the cross section appears white is the skin layer, and the part where the black part appears is the foamed inner layer.
Claims (3)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2006339326A JP4489751B2 (en) | 2006-12-18 | 2006-12-18 | Manufacturing method of RIM molded product |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2006339326A JP4489751B2 (en) | 2006-12-18 | 2006-12-18 | Manufacturing method of RIM molded product |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2002222689A Division JP3989322B2 (en) | 2002-07-31 | 2002-07-31 | Manufacturing method of RIM molded product |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2007112142A JP2007112142A (en) | 2007-05-10 |
| JP4489751B2 true JP4489751B2 (en) | 2010-06-23 |
Family
ID=38094744
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2006339326A Expired - Lifetime JP4489751B2 (en) | 2006-12-18 | 2006-12-18 | Manufacturing method of RIM molded product |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP4489751B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101440207B (en) | 2007-09-19 | 2012-08-08 | 住化拜耳氨酯株式会社 | Integral skin molded article, method of preparing an integral skin molded article and laminate having integral skin made of polyurethane using the reaction injection molding process |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05305629A (en) * | 1992-01-29 | 1993-11-19 | Asahi Glass Co Ltd | Manufacture of polyurethane foam molded aritcle |
| JPH071493A (en) * | 1993-06-19 | 1995-01-06 | Toyoda Gosei Co Ltd | Molding method for integral-skin foam |
| JPH09183138A (en) * | 1995-12-28 | 1997-07-15 | Toyoda Gosei Co Ltd | Rim polyurethane two-color molding method |
| JPH10309733A (en) * | 1996-03-28 | 1998-11-24 | Toyoda Gosei Co Ltd | Rim polyurethane bicolor molded article and bicolor molding method |
| JP2001162650A (en) * | 1999-12-08 | 2001-06-19 | Japan Steel Works Ltd:The | Method and apparatus for manufacturing sandwich foam |
| JP2001334549A (en) * | 2000-05-26 | 2001-12-04 | Idemitsu Petrochem Co Ltd | Method for manufacturing composite molded article, and composite molded article |
| JP2004058564A (en) * | 2002-07-31 | 2004-02-26 | Nippon Plast Co Ltd | Manufacturing method for reaction-injection-molded (rim) article |
-
2006
- 2006-12-18 JP JP2006339326A patent/JP4489751B2/en not_active Expired - Lifetime
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05305629A (en) * | 1992-01-29 | 1993-11-19 | Asahi Glass Co Ltd | Manufacture of polyurethane foam molded aritcle |
| JPH071493A (en) * | 1993-06-19 | 1995-01-06 | Toyoda Gosei Co Ltd | Molding method for integral-skin foam |
| JPH09183138A (en) * | 1995-12-28 | 1997-07-15 | Toyoda Gosei Co Ltd | Rim polyurethane two-color molding method |
| JPH10309733A (en) * | 1996-03-28 | 1998-11-24 | Toyoda Gosei Co Ltd | Rim polyurethane bicolor molded article and bicolor molding method |
| JP2001162650A (en) * | 1999-12-08 | 2001-06-19 | Japan Steel Works Ltd:The | Method and apparatus for manufacturing sandwich foam |
| JP2001334549A (en) * | 2000-05-26 | 2001-12-04 | Idemitsu Petrochem Co Ltd | Method for manufacturing composite molded article, and composite molded article |
| JP2004058564A (en) * | 2002-07-31 | 2004-02-26 | Nippon Plast Co Ltd | Manufacturing method for reaction-injection-molded (rim) article |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2007112142A (en) | 2007-05-10 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP5152430B2 (en) | Injection molding method | |
| US9126358B2 (en) | Method of improving the appearance of injection molding and foaming product | |
| CA2996708C (en) | Vented mold | |
| KR20130047821A (en) | Foam injection molding method for interior material of vehicle, mold for foam injection molding and gas counter pressure control apparatus | |
| US7001549B1 (en) | Method for producing physically foamed injection moulded parts | |
| US5834527A (en) | Process for the manufacture of polyurethane foam moldings | |
| JP3989322B2 (en) | Manufacturing method of RIM molded product | |
| TW200609281A (en) | A method for the manufacture of a foamed polymer body | |
| JP4489751B2 (en) | Manufacturing method of RIM molded product | |
| CA2291642A1 (en) | Vented mold and method for producing a molded article | |
| DE10014156A1 (en) | Molding foamed plastic component for e.g. vehicle cladding, loads melt with gas before injection and controls foaming initiation, local skin thickness and foam structure | |
| JP2006281698A (en) | Shaping method for foamed molded product, and shaping device for foamed molded product | |
| JP2018111078A (en) | Method and apparatus for producing foam resin | |
| JPS61116509A (en) | Filling method of car body with foam | |
| JP2002528306A (en) | Molded polymeric materials including injection molded microporous low density polymeric materials | |
| JP2022035452A (en) | Manufacturing method of interior material for vehicle | |
| JP2008247026A (en) | Reaction injection molding method of foamed and molded product and foamed and molded product | |
| JP4120088B2 (en) | RIM polyurethane molding method and polyurethane molded article | |
| JPH05309665A (en) | Manufacture of expanded polyurethane molded article and molding equipment | |
| DE2651665A1 (en) | Laminate with smooth skin and porous core - prepd. by injecting an expansible and compact plastics strand into a mould | |
| WO2021070798A1 (en) | Foam-molded product, method of manufacturing foam-molded product, and method of suppressing poor appearance of foam-molded product | |
| Di Maio et al. | Molding processes | |
| KR20040078503A (en) | Resin for steering wheel of automobile and preparation method of steering wheel for automobile using the same | |
| JPS61252121A (en) | Injection molding device | |
| JP2022015219A (en) | Injection molding method for sandwich molded article |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A131 | Notification of reasons for refusal |
Free format text: JAPANESE INTERMEDIATE CODE: A131 Effective date: 20091001 |
|
| A521 | Written amendment |
Free format text: JAPANESE INTERMEDIATE CODE: A523 Effective date: 20091125 |
|
| TRDD | Decision of grant or rejection written | ||
| A01 | Written decision to grant a patent or to grant a registration (utility model) |
Free format text: JAPANESE INTERMEDIATE CODE: A01 Effective date: 20100330 |
|
| A01 | Written decision to grant a patent or to grant a registration (utility model) |
Free format text: JAPANESE INTERMEDIATE CODE: A01 |
|
| A61 | First payment of annual fees (during grant procedure) |
Free format text: JAPANESE INTERMEDIATE CODE: A61 Effective date: 20100331 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20130409 Year of fee payment: 3 |
|
| R150 | Certificate of patent or registration of utility model |
Ref document number: 4489751 Country of ref document: JP Free format text: JAPANESE INTERMEDIATE CODE: R150 Free format text: JAPANESE INTERMEDIATE CODE: R150 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20140409 Year of fee payment: 4 |
|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |