JPH0716933A - Fiber reinforced thermoplastic resin foamed molded object and production thereof - Google Patents
Fiber reinforced thermoplastic resin foamed molded object and production thereofInfo
- Publication number
- JPH0716933A JPH0716933A JP5143972A JP14397293A JPH0716933A JP H0716933 A JPH0716933 A JP H0716933A JP 5143972 A JP5143972 A JP 5143972A JP 14397293 A JP14397293 A JP 14397293A JP H0716933 A JPH0716933 A JP H0716933A
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- Prior art keywords
- thermoplastic resin
- fiber
- reinforced thermoplastic
- weight
- mold
- 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.)
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Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、繊維強化熱可塑性樹脂
発泡成形体及びその製造方法に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fiber-reinforced thermoplastic resin foam molding and a method for producing the same.
【０００２】[0002]
【従来の技術】従来より、発泡体の成形方法としては、
ビーズ状発泡材料を金型内に入れ、これに加熱蒸気を吹
き込んで発泡させる方法やポリウレタン発泡体の原料で
あるポリオールとイソシアネートを金型内に注入、反応
させて発泡体を得る反応射出成形法などが周知である。
しかしながら、これらの成形方法では、強度が弱くかつ
再生利用ができない発泡体しか得られなかった。2. Description of the Related Art Conventionally, as a method for molding a foam,
A method in which a beaded foam material is placed in a mold and blown with heated steam to foam it, or a reaction injection molding method in which a polyol and an isocyanate, which are raw materials for polyurethane foam, are injected into the mold and reacted to obtain a foam. Are well known.
However, these molding methods have only yielded foams which are weak in strength and cannot be recycled.
【０００３】そこで、最近では、再生利用可能な熱可塑
性樹脂発泡体や繊維強化熱可塑性樹脂発泡体が広く用い
られている。Therefore, recently, recyclable thermoplastic resin foams and fiber-reinforced thermoplastic resin foams have been widely used.
【０００４】上記熱可塑性樹脂発泡体の製造方法として
は、例えば、発泡剤が混入された熱可塑性樹脂を、型閉
めされた金型キャビティ内にショートショットに射出す
る方法やキャビティ内に充填した後、キャビティ容積を
増大して発泡させる方法などが挙げられる（工業材料２
９［３］（１９８１年３月）橋本建次郎Ｐ．６０−６
４）。As a method for producing the thermoplastic resin foam, for example, a method in which a thermoplastic resin mixed with a foaming agent is injected in a short shot into a closed mold cavity or after filling the cavity , A method of increasing the volume of the cavity and foaming (industrial material 2
9 [3] (March 1981) Kenjiro Hashimoto P. 60-6
4).
【０００５】[0005]
【発明が解決しようとする課題】しかしながら、上記技
術を用いて繊維強化熱可塑性樹脂発泡体を成形すると、
含有強化繊維がランダムに配向しているため、必要な強
化方向以外の方向を強化している強化繊維が多くなり、
重量の割に強化効率が悪いという問題があった。本発明
の目的は、軽量でかつ特に厚さ方向に高強度を有する繊
維強化熱可塑性樹脂発泡成形体とその製造方法を提供す
ることにある。However, when a fiber reinforced thermoplastic resin foam is molded using the above technique,
Since the contained reinforcing fibers are randomly oriented, many reinforcing fibers are strengthening in directions other than the necessary strengthening direction,
There was a problem that the reinforcement efficiency was poor relative to the weight. An object of the present invention is to provide a fiber-reinforced thermoplastic resin foam molded article which is lightweight and has high strength particularly in the thickness direction, and a method for producing the same.
【０００６】[0006]
【課題を解決するための手段】請求項１の発明による繊
維強化熱可塑性樹脂発泡成形体は、長さ５〜２５ｍｍの
強化繊維を２０〜７０重量％含有する繊維強化熱可塑性
樹脂からなるとともに、発泡コア層の両面に強化繊維が
表面とほぼ平行に配向しているスキン層を備えており、
コア層に含まれている強化繊維のうち２０重量％以上の
繊維がスキン層に対してほぼ垂直に配向していることを
特徴とするものである。A fiber-reinforced thermoplastic resin foam-molded article according to the present invention comprises a fiber-reinforced thermoplastic resin containing 20 to 70% by weight of a reinforcing fiber having a length of 5 to 25 mm, and The foam core layer is provided with skin layers on both sides of which the reinforcing fibers are oriented substantially parallel to the surface,
20% by weight or more of the reinforcing fibers contained in the core layer are oriented substantially perpendicular to the skin layer.
【０００７】請求項２の発明は、発泡コア層の両面に強
化繊維が表面とほぼ平行に配向しているスキン層を備え
た繊維強化熱可塑性樹脂発泡成形体の製造方法におい
て、長さ５〜２５ｍｍの強化繊維を２０〜７０重量％含
有する加熱発泡性繊維強化熱可塑性樹脂を、その熱可塑
性樹脂の溶融温度以上でかつ発泡温度以上に加熱した状
態で、金型キャビティ内に充填し、加熱発泡性繊維強化
熱可塑性樹脂の温度が前記溶融温度以上であるうちに、
キャビティ容積が前記充填時の１．５〜１０倍になるよ
うに型開きして繊維強化熱可塑性樹脂を発泡させ、コア
層に含まれている強化繊維のうち２０重量％以上の繊維
をスキン層に対してほぼ垂直に配向させることを特徴と
するものである。According to a second aspect of the present invention, there is provided a method for producing a fiber-reinforced thermoplastic resin foamed molded article having skin layers in which reinforcing fibers are oriented substantially parallel to the surface on both sides of a foamed core layer. A heat-expandable fiber-reinforced thermoplastic resin containing 20 to 70% by weight of 25 mm reinforcing fiber is filled in the mold cavity while being heated to a temperature not lower than the melting temperature of the thermoplastic resin and not lower than the foaming temperature, and heated. While the temperature of the expandable fiber reinforced thermoplastic resin is equal to or higher than the melting temperature,
The mold is opened so that the cavity volume is 1.5 to 10 times that of the above-mentioned filling, the fiber-reinforced thermoplastic resin is foamed, and 20% by weight or more of the reinforcing fibers contained in the core layer are skin layers. It is characterized in that it is oriented almost perpendicular to.
【０００８】強化繊維としては、ガラス繊維、炭素繊
維、シリコン・チタン・炭素繊維、ボロン繊維、微細な
金属繊維、アラミド繊維、ポリエステル繊維、ポリアミ
ド繊維などの有機繊維を挙げることができる。モノフィ
ラメントの直径は１〜５０μｍ、特に３〜２３μｍが好
ましい。繊維長は５〜２５ｍｍの範囲内で、製品の要求
性能及び形状等により適宜決定される。繊維長が５ｍｍ
未満では所期の製品は得られず、２５ｍｍを超えると、
熱可塑性樹脂及び発泡剤との混練や混合、溶融、金型へ
の供給などが困難となるし、コア層における強化繊維が
スキン層に対しほぼ垂直に配向し難くなる。Examples of the reinforcing fiber include organic fibers such as glass fiber, carbon fiber, silicon / titanium / carbon fiber, boron fiber, fine metal fiber, aramid fiber, polyester fiber and polyamide fiber. The diameter of the monofilament is preferably 1 to 50 μm, particularly preferably 3 to 23 μm. The fiber length is in the range of 5 to 25 mm and is appropriately determined according to the required performance and shape of the product. Fiber length is 5 mm
If it is less than 25 mm, the desired product cannot be obtained, and if it exceeds 25 mm,
It becomes difficult to knead, mix, melt, supply to the mold with the thermoplastic resin and the foaming agent, and it becomes difficult to orient the reinforcing fibers in the core layer substantially perpendicularly to the skin layer.
【０００９】強化繊維の含有率は、２０〜７０重量％の
範囲になるように混合する必要がある。強化繊維の含有
率が２０重量％未満であると、所期の発泡成形体が得ら
れず、強化繊維が７０重量％を超えると、モノフィラメ
ント繊維間に浸透する熱可塑性樹脂が不充分となり、成
形体の剛性が著しく低下する。It is necessary to mix the reinforcing fibers so that the content of the reinforcing fibers is in the range of 20 to 70% by weight. If the content of the reinforcing fibers is less than 20% by weight, the desired foamed molded product cannot be obtained, and if the content of the reinforcing fibers exceeds 70% by weight, the thermoplastic resin that penetrates between the monofilament fibers becomes insufficient, resulting in molding. The rigidity of the body is significantly reduced.
【００１０】熱可塑性樹脂は、加熱により溶融軟化する
樹脂すべてが使用可能である。例えば、ポリエチレン、
ポリプロピレン、ポリ塩化ビニル、ポリスチレン、ポリ
アミド、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、ポリカーボネート、ポリフッ化ビニリデ
ン、ポリフェニレンサルファイド、ポリフェニレンオキ
サイド、ポリエーテルスルホン、ポリエーテルエーテル
ケトン等が使用される。As the thermoplastic resin, any resin that is melted and softened by heating can be used. For example, polyethylene,
Polypropylene, polyvinyl chloride, polystyrene, polyamide, polyethylene terephthalate, polybutylene terephthalate, polycarbonate, polyvinylidene fluoride, polyphenylene sulfide, polyphenylene oxide, polyether sulfone, polyether ether ketone and the like are used.
【００１１】また、上記熱可塑性樹脂を主成分とする共
重合体やグラフト樹脂やブレンド樹脂、例えばエチレン
−塩化ビニル共重合体、酢酸ビニル−エチレン共重合
体、酢酸ビニル−塩化ビニル共重合体、ウレタン−塩化
ビニル共重合体、アクリロニトリル−ブタジエン−スチ
レン共重合体、アクリル酸変性ポリプロピレン、マレイ
ン酸変性ポリエチレンなども使用しうる。そして、前記
熱可塑性樹脂には、安定剤、滑剤、加工助剤、可塑剤、
着色剤のような添加剤及びタルク、マイカや炭酸カルシ
ウム等の充填材が配合されてもよい。Further, copolymers or graft resins or blend resins containing the above-mentioned thermoplastic resin as a main component, such as ethylene-vinyl chloride copolymer, vinyl acetate-ethylene copolymer, vinyl acetate-vinyl chloride copolymer, Urethane-vinyl chloride copolymer, acrylonitrile-butadiene-styrene copolymer, acrylic acid-modified polypropylene, maleic acid-modified polyethylene and the like can also be used. The thermoplastic resin includes a stabilizer, a lubricant, a processing aid, a plasticizer,
Additives such as colorants and fillers such as talc, mica and calcium carbonate may be blended.
【００１２】熱可塑性樹脂に配合する発泡剤としては、
熱により分解または縮合してガスを生成するアゾジカル
ボンアミド、アゾビスイソブチロニトリル、Ｎ，Ｎ’−
ジニトロソペンタメチレンテトラミン、ｐｐ’−オキシ
ビスベンゼンスルホニルヒドラジド、アゾジカルボン酸
バリウム、トリヒドラジノトリアジン、ｐ−トルエンス
ルホニルヒドラジド等が挙げられる。配合量は、発泡剤
によって異なるが、高強度を得るためには、発泡倍率が
１．５〜３．５倍程度となるように配合することが好ま
しい。As the foaming agent to be added to the thermoplastic resin,
Azodicarbonamide, which decomposes or condenses by heat to generate gas, azobisisobutyronitrile, N, N'-
Examples thereof include dinitrosopentamethylenetetramine, pp'-oxybisbenzenesulfonyl hydrazide, barium azodicarboxylate, trihydrazinotriazine, p-toluenesulfonyl hydrazide. The blending amount varies depending on the foaming agent, but in order to obtain high strength, it is preferable that the blending ratio is about 1.5 to 3.5 times.
【００１３】加熱発泡性繊維強化熱可塑性樹脂は、熱可
塑性樹脂に強化繊維と発泡剤を混合するかまたは発泡剤
の発泡温度以下で混練することにより得られる。The heat-expandable fiber-reinforced thermoplastic resin can be obtained by mixing the reinforcing fiber and the foaming agent with the thermoplastic resin or by kneading at a temperature not higher than the foaming temperature of the foaming agent.
【００１４】コア層に含まれる強化繊維のうち２０重量
％以上の繊維がほぼ垂直方向に配向していなくてはなら
ない。この明細書で「ほぼ垂直」とは、強化繊維が両ス
キン層のうちいずれか一方に対して７５度以上の角度で
配向している状態をいう。すなわち、７５度以上の角度
で一方のスキン層に達し、弧を描いて他の強化繊維、熱
可塑性樹脂または他方のスキン層に接している強化繊維
をほぼ垂直方向に配向しているというものとする。スキ
ン層に対する強化繊維の配向角度が７５度未満である
と、スキン層に垂直に加わる圧縮力に対して強度が弱
く、また、コア層に含まれている強化繊維のうちほぼ垂
直方向に配向している繊維が２０重量％未満であって
も、スキン層に垂直に加わる圧縮力に対して強度が弱
い。なお、スキン層の露出面には薄い熱可塑性樹脂のみ
の層が形成されていることが好ましい。20% by weight or more of the reinforcing fibers contained in the core layer must be oriented in a substantially vertical direction. In this specification, "substantially vertical" means a state in which the reinforcing fibers are oriented at an angle of 75 degrees or more with respect to one of the two skin layers. That is, one skin layer is reached at an angle of 75 degrees or more, and an arc is drawn to orient the reinforcing fibers in contact with the other reinforcing fiber, the thermoplastic resin, or the other skin layer in a substantially vertical direction. To do. If the orientation angle of the reinforcing fibers with respect to the skin layer is less than 75 degrees, the strength is weak against the compressive force applied vertically to the skin layer, and the reinforcing fibers contained in the core layer are oriented in a substantially vertical direction. Even if the content of the fibers is less than 20% by weight, the strength is weak against the compressive force applied vertically to the skin layer. In addition, it is preferable that a thin layer of a thermoplastic resin is formed on the exposed surface of the skin layer.
【００１５】コア層の強化繊維は、供給された溶融状態
の加熱発泡性繊維強化熱可塑性樹脂がキャビティ内に充
填される際に供給場所を中心として放射状に配向し、つ
ぎに繊維強化熱可塑性樹脂の発泡と繊維自体の立毛のた
めに片方のスキン層に対してほぼ垂直方向に配向する。The reinforcing fibers of the core layer are oriented radially around the supply location when the supplied heat-expandable fiber-reinforced thermoplastic resin in a molten state is filled in the cavity, and then the fiber-reinforced thermoplastic resin. Because of the foaming of the fibers and the nap of the fibers themselves, they are oriented almost perpendicular to one skin layer.
【００１６】溶融状態の発泡性繊維強化熱可塑性樹脂を
金型キャビティ内に充填する方法としては、これを予め
型閉めされたキャビティ内に射出充填する方法や、開放
状態の金型のキャビティに供給後ただちに型閉めして圧
縮力により充填する方法が挙げられる。ただし、型閉め
して圧縮力により充填する方法では、射出充填する方法
に比べてスキン層が厚くなるので、型開きを早めに行な
うことが望ましい。As a method for filling the moldable cavity with the meltable foamable fiber reinforced thermoplastic resin, the mold cavity may be injected and filled into a previously closed cavity, or may be supplied to the mold cavity in an open state. There is a method in which the mold is closed immediately afterward and the powder is filled with a compressive force. However, in the method of closing the mold and filling with the compressive force, the skin layer becomes thicker than in the method of injection filling, so it is desirable to open the mold earlier.
【００１７】充填後の型開きは、熱可塑性樹脂が型内で
溶融温度以上であるうちに行なわなければならない。溶
融熱可塑性樹脂の温度によって異なるが、熱可塑性樹脂
がキャビティに充填している状態を長時間維持するとス
キン層の厚さが厚くなって発泡し難くなるし、発生した
過剰のガスも抜け難くなり、製品形状が悪くなる原因と
なる。スキン層の厚さは、０．５〜５ｍｍが好ましい。
繊維強化熱可塑性樹脂の発泡は、熱可塑性樹脂が発泡剤
の発泡温度以上であるうちに型開きして行なってもよい
し、発泡剤が発泡し、熱可塑性樹脂内で発泡したガスが
圧力を持っている状態で型開きして行なってもよい。The opening of the mold after filling must be carried out while the thermoplastic resin is above the melting temperature in the mold. Depending on the temperature of the molten thermoplastic resin, if the cavity filled with the thermoplastic resin is maintained for a long time, the skin layer becomes thicker and foaming becomes difficult, and excess gas generated is also difficult to escape. It will cause the product shape to deteriorate. The thickness of the skin layer is preferably 0.5 to 5 mm.
The foaming of the fiber-reinforced thermoplastic resin may be performed by opening the mold while the thermoplastic resin is at the foaming temperature of the foaming agent or higher, or the foaming agent foams, and the gas foamed in the thermoplastic resin exerts a pressure. You may open the mold while holding it.
【００１８】キャビティ容積が充填時の１．５倍未満で
あると、コア層に含まれている強化繊維のうちの２０重
量％以上の繊維がスキン層に対してほぼ垂直に配向せ
ず、キャビティ容積が充填時の１０倍を超えるとコア層
に大きな空洞部ができやすく、得られる成形体の強度が
低下する虞れがある。型開きは、キャビティ容積が熱可
塑性樹脂充填時の２〜４倍となるように行なうのが好ま
しい。If the volume of the cavity is less than 1.5 times the volume when the cavity is filled, 20% by weight or more of the reinforcing fibers contained in the core layer will not be oriented substantially perpendicular to the skin layer, and If the volume exceeds 10 times the volume when filled, a large cavity is likely to be formed in the core layer, and the strength of the obtained molded body may be reduced. The mold opening is preferably performed so that the cavity volume is 2 to 4 times as large as that when the thermoplastic resin is filled.
【００１９】なお、金型の型開き間隙は、通常８〜１０
０ｍｍ、好ましくは５〜４０ｍｍの範囲とされる。The mold opening gap of the mold is usually 8 to 10.
The range is 0 mm, preferably 5 to 40 mm.
【００２０】型開き距離が大きいほど繊維はスキン層に
対して垂直方向に配向しやすく、樹脂に含有される繊維
の長さ以上の距離だけ型開きを行なうとコア層中の半数
以上の繊維がスキン層に対して垂直方向に配向するが、
大き過ぎるとキャビティ容積が過大となり、成形体強度
が低下することとなる。The larger the mold opening distance, the more easily the fibers are oriented in the direction perpendicular to the skin layer, and when the mold opening is carried out by a distance more than the length of the fibers contained in the resin, more than half of the fibers in the core layer are removed. Oriented vertically to the skin layer,
If it is too large, the cavity volume becomes too large, and the strength of the molded body decreases.
【００２１】[0021]
【作用】請求項１の発明による繊維強化熱可塑性樹脂発
泡成形体は、長さ５〜２５ｍｍの強化繊維を２０〜７０
重量％含有する繊維強化熱可塑性樹脂からなるととも
に、発泡コア層の両面に強化繊維が表面とほぼ平行に配
向しているスキン層を備えており、コア層に含まれてい
る強化繊維のうち２０重量％以上の繊維がスキン層に対
してほぼ垂直に配向しているので、発泡成形体の軽量な
割にその厚さ方向に高強度を有する。The fiber-reinforced thermoplastic resin foam-molded article according to the present invention comprises 20-70 reinforced fibers having a length of 5-25 mm.
In addition to the fiber-reinforced thermoplastic resin contained in a weight percentage, the foam core layer is provided with skin layers on both sides of which the reinforcing fibers are oriented substantially parallel to the surface, and 20 of the reinforcing fibers contained in the core layer are included. Since more than weight% of the fibers are oriented substantially perpendicular to the skin layer, the foamed molded product has high strength in its thickness direction, despite its light weight.
【００２２】請求項２の発明は、発泡コア層の両面に強
化繊維が表面とほぼ平行に配向しているスキン層を備え
た繊維強化熱可塑性樹脂発泡成形体の製造方法におい
て、長さ５〜２５ｍｍの強化繊維を２０〜７０重量％含
有する加熱発泡性繊維強化熱可塑性樹脂を、その熱可塑
性樹脂の溶融温度以上でかつ発泡温度以上に加熱した状
態で、金型キャビティ内に充填し、加熱発泡性繊維強化
熱可塑性樹脂の温度が前記溶融温度以上であるうちに、
キャビティ容積が前記充填時の１．５〜１０倍になるよ
うに型開きして繊維強化熱可塑性樹脂を発泡させ、コア
層に含まれている強化繊維のうち２０重量％以上の繊維
をスキン層に対してほぼ垂直に配向させるものであるか
ら、軽量な割に厚さ方向に高強度を有する発泡成形体が
得られる。According to a second aspect of the present invention, there is provided a method for producing a fiber-reinforced thermoplastic resin foam-molded article having a skin layer in which reinforcing fibers are oriented substantially parallel to the surface on both sides of a foamed core layer. A heat-expandable fiber-reinforced thermoplastic resin containing 20 to 70% by weight of 25 mm reinforcing fiber is filled in the mold cavity while being heated to a temperature not lower than the melting temperature of the thermoplastic resin and not lower than the foaming temperature, and heated. While the temperature of the expandable fiber reinforced thermoplastic resin is equal to or higher than the melting temperature,
The mold is opened so that the cavity volume is 1.5 to 10 times that of the above-mentioned filling, the fiber-reinforced thermoplastic resin is foamed, and 20% by weight or more of the reinforcing fibers contained in the core layer are skin layers. Since it is oriented almost perpendicular to, a foamed molded product having high strength in the thickness direction can be obtained although it is lightweight.
【００２３】[0023]
【実施例】以下本発明の実施例を、図面を参照するとと
もに、比較例と対比して説明する。EXAMPLES Examples of the present invention will be described below with reference to the drawings and in comparison with comparative examples.
【００２４】実施例１ 図１に示す平板状の繊維強化熱可塑性樹脂発泡成形体
(1) は、長さ１２．５ｍｍの強化繊維を４０重量％含有
する繊維強化熱可塑性樹脂からなるとともに、発泡コア
層(2) の両面に強化繊維が表面とほぼ平行に配向してい
るスキン層(3) を備えており、コア層(2) に含まれる強
化繊維のうち約３０重量％の繊維がスキン層(3) に対し
てほぼ垂直に配向しているものであり、強化繊維として
はガラス繊維が用いられ、熱可塑性樹脂としてはポリプ
ロピレンが用いられている。Example 1 Flat-plate fiber-reinforced thermoplastic resin foamed molded product shown in FIG.
(1) is a skin composed of a fiber-reinforced thermoplastic resin containing 40% by weight of reinforcing fibers having a length of 12.5 mm, and the reinforcing fibers are oriented substantially parallel to the surface on both sides of the foamed core layer (2). It has a layer (3), and about 30% by weight of the reinforcing fibers contained in the core layer (2) are oriented almost perpendicular to the skin layer (3). Uses glass fiber, and polypropylene is used as the thermoplastic resin.
【００２５】上記繊維強化熱可塑性樹脂発泡成形体の製
造方法の１例は、つぎのとおりである。An example of the method for producing the fiber-reinforced thermoplastic resin foamed molded product is as follows.
【００２６】まず、直径２３μｍ、長さ１２．５ｍｍの
ガラス繊維を４０重量％含有するポリプロピレン１００
重量部に対し、アゾジカルボンアミド系発泡剤５重量部
を混合し、加熱発泡性繊維強化熱可塑性樹脂を得た。First, polypropylene 100 containing 40% by weight of glass fiber having a diameter of 23 μm and a length of 12.5 mm.
5 parts by weight of an azodicarbonamide-based foaming agent was mixed with parts by weight to obtain a heat-expandable fiber-reinforced thermoplastic resin.
【００２７】つぎに、上記加熱発泡性繊維強化熱可塑性
樹脂(4) を、図２に示すように、射出（図示略）で約２
１５℃に加熱後、６０℃に温度調整されている圧縮成形
用金型(5) のキャビティクリアランスが１０ｍｍになる
まで上型(6) を降下して型閉めしたキャビティ(7) 内
に、下型(8) のホットランナー(9) を通して、約４秒で
充填した。充填完了３秒後、キャビティ容積が充填時の
２．５倍、型開き間隙が２５ｍｍとなるように型開き
し、そのまま製品の温度が７０℃になるまで冷却し、図
１に示すような製品である発泡成形体(1) を取り出し
た。Next, the above heat-expandable fiber-reinforced thermoplastic resin (4) is injected (not shown) to about 2 as shown in FIG.
After heating to 15 ℃, lower the upper mold (6) into the closed cavity (7) by lowering the upper mold (6) until the cavity clearance of the compression molding mold (5) adjusted to 60 ℃ is 10mm. It was filled in about 4 seconds through the hot runner (9) of the mold (8). After 3 seconds from the completion of filling, the mold is opened so that the cavity volume is 2.5 times as large as that at the time of filling and the mold opening gap is 25 mm, and the product is cooled as it is to 70 ° C. Then, the foamed molded product (1) was removed.
【００２８】得られた発泡成形体(1) の厚さは３５ｍ
ｍ、スキン層(3) の厚さは両面とも２ｍｍで、ガラス繊
維は表面とほぼ平行に配向しており、コア層(2) の厚さ
は３１ｍｍで、これに含まれるガラス繊維の約３０重量
％の繊維がスキン層(3) に対してほぼ垂直に配向してい
た。The obtained foamed molded product (1) has a thickness of 35 m.
m, the thickness of the skin layer (3) is 2 mm on both sides, the glass fibers are oriented substantially parallel to the surface, and the thickness of the core layer (2) is 31 mm, which is about 30% of the glass fibers contained therein. Weight% of the fibers were oriented almost perpendicular to the skin layer (3).
【００２９】実施例２ 繊維強化熱可塑性樹脂発泡成形体の製造方法の他の例
は、つぎのとおりである。Example 2 Another example of the method for producing a fiber-reinforced thermoplastic resin foamed molded product is as follows.
【００３０】実施例１と同じ加熱発泡性繊維強化熱可塑
性樹脂(4) を約２１５℃に加熱後、図３に示すように、
押出機（図示略）の吐出部(10)を圧縮成形用金型(11)の
上型(12)と下型(13)の間に挿入し、両型(12)(13)間を適
宜移動せしめながら、そのノズル(14)より下型(13)に吐
出し、吐出部(10)を両型(12)(13)間から退避させた後、
ただちにキャビティクリアランスが１０ｍｍになるまで
型閉めしてキャビティ(15)内に加熱発泡性繊維強化熱可
塑性樹脂(4) を充填した。充填完了３秒後、キャビティ
容積が充填時の２．５倍、型開き間隙が２５ｍｍとなる
ように型開きし、そのまま製品の温度が７０℃になるま
で冷却し、製品である発泡成形体を取り出した。After heating the same heat-expandable fiber-reinforced thermoplastic resin (4) as in Example 1 to about 215 ° C., as shown in FIG.
Insert the discharge part (10) of the extruder (not shown) between the upper mold (12) and the lower mold (13) of the compression molding mold (11), and appropriately insert between the molds (12) and (13). While moving, discharge from the nozzle (14) to the lower mold (13), and withdraw the discharge part (10) from between both molds (12) (13),
Immediately, the mold was closed until the cavity clearance reached 10 mm, and the heat-expandable fiber-reinforced thermoplastic resin (4) was filled in the cavity (15). 3 seconds after the completion of filling, the mold is opened so that the cavity volume is 2.5 times as large as that at the time of filling and the mold opening gap is 25 mm, and the product is cooled to 70 ° C. as it is to obtain a foamed molded product. I took it out.
【００３１】得られた成形体の厚さは３５ｍｍ、スキン
層の厚さは下面が４ｍｍ、上面が３ｍｍで、ともにガラ
ス繊維は表面とほぼ平行に配向しており、コア層の厚さ
は２８ｍｍであり、コア層に含まれるガラス繊維の約２
５重量％の繊維がスキン層に対してほぼ垂直に配向して
いた。The obtained molded product has a thickness of 35 mm, the skin layer has a thickness of 4 mm on the lower surface and 3 mm on the upper surface, and the glass fibers are oriented substantially parallel to the surface, and the thickness of the core layer is 28 mm. And about 2 of the glass fibers contained in the core layer
5% by weight of the fibers were oriented almost perpendicular to the skin layer.
【００３２】実施例３ 繊維径２３μｍ、繊維長６．３ｍｍのガラス繊維を、繊
維含有量４０重量％含有するポリプロピレン樹脂１００
重量部に対し、アゾジカルボンアミド系発泡剤５重量部
を混合し、発泡性繊維強化熱可塑性樹脂を得た。この発
泡性繊維強化熱可塑性樹脂(11)を、図１に示すように、
図外の射出成形機で約２１５℃に加熱後、キャビティク
リアランスが１０ｍｍになるまで型閉めされた圧縮成形
用金型(10)キャビティ内に、下型(10a) 内のホットラン
ナー(12)を通して、約２秒で充填した。充填完了１秒
後、８ｍｍ型開き（１．８倍分）し、そのまま製品の温
度が７０℃になるまで冷却し、製品を取り出した。Example 3 A polypropylene resin 100 containing glass fibers having a fiber diameter of 23 μm and a fiber length of 6.3 mm and having a fiber content of 40% by weight.
5 parts by weight of an azodicarbonamide-based foaming agent was mixed with parts by weight to obtain a foamable fiber-reinforced thermoplastic resin. This expandable fiber reinforced thermoplastic resin (11) is
Pass the hot runner (12) in the lower mold (10a) into the compression molding mold (10) cavity, which was heated to about 215 ° C with an injection molding machine (not shown) and closed until the cavity clearance reached 10 mm. , It took about 2 seconds to fill. One second after completion of the filling, the 8 mm mold was opened (1.8 times), the product was cooled as it was to 70 ° C., and the product was taken out.
【００３３】得られた成形体の厚さは１８ｍｍ、スキン
層の厚さは両面とも２ｍｍで、コア層の厚さは１４ｍ
ｍ、コア層中のガラス繊維の約半分量の繊維が配向して
いた。 比較例１ この比較例は、加熱発泡性強化熱可塑性樹脂として、長
さ３．０ｍｍのガラス繊維を用いること以外実施例１と
同様にして繊維強化熱可塑性樹脂発泡成形体を得たもの
である。The obtained molded body has a thickness of 18 mm, the skin layers have a thickness of 2 mm on both sides, and the core layer has a thickness of 14 m.
m, about half of the glass fibers in the core layer were oriented. Comparative Example 1 In this Comparative Example, a fiber-reinforced thermoplastic resin foamed molded product was obtained in the same manner as in Example 1 except that glass fibers having a length of 3.0 mm were used as the heat-foamable reinforced thermoplastic resin. .
【００３４】比較例２ この比較例は、発泡性繊維強化熱可塑性樹脂を圧縮成形
用金型のキャビティに充填後、キャビティ容積が充填時
の１．４倍、型開き間隙が５ｍｍとなるように型開きを
行なうこと以外実施例１と同様にして繊維強化熱可塑性
樹脂発泡成形体を得たものである。Comparative Example 2 In this comparative example, after the expandable fiber reinforced thermoplastic resin was filled in the cavity of the compression molding die, the cavity volume was 1.4 times that at the time of filling and the mold opening gap was 5 mm. A fiber-reinforced thermoplastic resin foam molding is obtained in the same manner as in Example 1 except that the mold opening is performed.
【００３５】各実施例及び各比較例で得られた発泡成形
体について、密度を測定するとともに、圧縮強度試験を
行なった結果を表１に示す。なお、密度測定は、ＪＩＳ
−Ｋ７２２２ 硬質発泡プラスチックの密度測定方法に
準じ、圧縮強度試験は、ＪＩＳ−Ｋ７２２０ 硬質発泡
プラスチックの圧縮試験方法に準ずる。The results obtained by measuring the density and performing the compressive strength test on the foamed molded articles obtained in each of the examples and each of the comparative examples are shown in Table 1. The density is measured according to JIS
-K7222 According to the method for measuring the density of hard foamed plastic, the compressive strength test conforms to the method for compression test of JIS-K7220 hard foamed plastic.
【００３６】[0036]
【表１】 表１から明らかなように、本発明の繊維強化熱可塑性樹
脂発泡成形体は、軽量でかつ厚み方向の圧縮強度に優れ
ている。[Table 1] As is clear from Table 1, the fiber-reinforced thermoplastic resin foam-molded product of the present invention is lightweight and has excellent compressive strength in the thickness direction.
【００３７】[0037]
【発明の効果】請求項１の発明の繊維強化熱可塑性樹脂
発泡成形体によれば、軽量な割にその厚さ方向に高強度
を有するので、重量の割に強化効率がよい。According to the fiber-reinforced thermoplastic resin foam-molded article of the first aspect of the present invention, since it has high strength in its thickness direction in spite of its light weight, it has a high reinforcing efficiency in comparison with its weight.
【００３８】請求項２の繊維強化熱可塑性樹脂発泡成形
体によれば、重量の割に強化効率のよい優れた発泡成形
体を確実にうることができる。According to the fiber-reinforced thermoplastic resin foam-molded article of the second aspect, it is possible to surely obtain an excellent foam-molded article having good reinforcing efficiency for its weight.
【図１】請求項１の発明による平板状の繊維強化熱可塑
性樹脂発泡成形体の斜視図である。FIG. 1 is a perspective view of a flat-plate fiber-reinforced thermoplastic resin foam-molded article according to the invention of claim 1.
【図２】請求項２の発明の実施例の１つを示すもので、
繊維強化熱可塑性樹脂発泡成形体の成形途上の状態を示
す横断面図である。FIG. 2 shows one of the embodiments of the invention of claim 2,
FIG. 3 is a transverse cross-sectional view showing a state in which the fiber-reinforced thermoplastic resin foam-molded article is being formed.
【図３】請求項２の発明の実施例の他の１つを示すもの
で、繊維強化熱可塑性樹脂発泡成形体の成形途上の状態
を示す横断面図である。FIG. 3 is a transverse cross-sectional view showing another embodiment of the invention of claim 2 and showing a state in which the fiber-reinforced thermoplastic resin foam molded article is in the process of being molded.
(1) ：繊維強化熱可塑性樹脂発泡成形体 (2) ：発泡コア層 (3) ：スキン層 (1): Fiber-reinforced thermoplastic resin foam molding (2): Foam core layer (3): Skin layer
フロントページの続き (51)Int.Cl.6 識別記号 庁内整理番号 ＦＩ 技術表示箇所 // Ｂ２９Ｋ 105:04 105:14 Continuation of front page (51) Int.Cl. 6 Identification number Office reference number FI technical display area // B29K 105: 04 105: 14
Claims (2)
０重量％含有する繊維強化熱可塑性樹脂からなるととも
に、発泡コア層の両面に強化繊維が表面とほぼ平行に配
向しているスキン層を備えており、コア層に含まれてい
る強化繊維のうち２０重量％以上の繊維がスキン層に対
してほぼ垂直に配向していることを特徴とする繊維強化
熱可塑性樹脂発泡成形体。1. A reinforcing fiber having a length of 5 to 25 mm and having a length of 20 to 7
Of the reinforcing fibers contained in the core layer, the core layer is made of a fiber reinforced thermoplastic resin containing 0% by weight, and has skin layers in which the reinforcing fibers are oriented substantially parallel to the surface on both sides of the foam core layer. 20% by weight or more of fibers are oriented substantially perpendicular to the skin layer, and a fiber-reinforced thermoplastic resin foam molding.
ぼ平行に配向しているスキン層を備えた繊維強化熱可塑
性樹脂発泡成形体の製造方法において、長さ５〜２５ｍ
ｍの強化繊維を２０〜７０重量％含有する加熱発泡性繊
維強化熱可塑性樹脂を、その熱可塑性樹脂の溶融温度以
上でかつ発泡温度以上に加熱した状態で、金型キャビテ
ィ内に充填し、加熱発泡性繊維強化熱可塑性樹脂の温度
が前記溶融温度以上であるうちに、キャビティ容積が前
記充填時の１．５〜１０倍になるように型開きして繊維
強化熱可塑性樹脂を発泡させ、コア層に含まれている強
化繊維のうち２０重量％以上の繊維をスキン層に対して
ほぼ垂直に配向させることを特徴とする繊維強化熱可塑
性樹脂発泡成形体の製造方法。2. A method for producing a fiber-reinforced thermoplastic resin foam-molded article having skin layers in which reinforcing fibers are oriented substantially parallel to the surface on both sides of a foamed core layer, wherein the length is 5 to 25 m.
The heat-expandable fiber-reinforced thermoplastic resin containing 20 to 70% by weight of the reinforcing fiber of m is filled in the mold cavity while being heated to the melting temperature of the thermoplastic resin or higher and the foaming temperature or higher, and heated. While the temperature of the expandable fiber-reinforced thermoplastic resin is the melting temperature or higher, the mold is opened so that the cavity volume is 1.5 to 10 times that of the filling, to foam the fiber-reinforced thermoplastic resin, and the core A method for producing a fiber-reinforced thermoplastic resin foamed molded article, wherein 20% by weight or more of the reinforcing fibers contained in the layer are oriented substantially perpendicular to the skin layer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14397293A JP3375377B2 (en) | 1993-06-15 | 1993-06-15 | Method for producing fiber-reinforced thermoplastic resin foam molded article |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14397293A JP3375377B2 (en) | 1993-06-15 | 1993-06-15 | Method for producing fiber-reinforced thermoplastic resin foam molded article |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0716933A true JPH0716933A (en) | 1995-01-20 |
| JP3375377B2 JP3375377B2 (en) | 2003-02-10 |
Family
ID=15351339
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP14397293A Expired - Fee Related JP3375377B2 (en) | 1993-06-15 | 1993-06-15 | Method for producing fiber-reinforced thermoplastic resin foam molded article |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3375377B2 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0825010A2 (en) * | 1996-08-20 | 1998-02-25 | Sumitomo Chemical Company, Limited | A fiber-reinforced article and a method for producing the same |
| NL1004268C2 (en) * | 1996-10-14 | 1998-04-15 | Dsm Nv | Shell-shaped molded part, a method for its manufacture and applications. |
| US5854149A (en) * | 1995-03-01 | 1998-12-29 | Kawasaki Steel Corporation Sumitomo Chemical Co., Ltd. | Paper-made stampable sheet, light-weight stampable sheet shaped body and method of producing light-weight stampable shaped body |
| JP2015143007A (en) * | 2013-12-03 | 2015-08-06 | ザ・ボーイング・カンパニーＴｈｅＢｏｅｉｎｇ Ｃｏｍｐａｎｙ | Hybrid laminate and molded composite structures |
-
1993
- 1993-06-15 JP JP14397293A patent/JP3375377B2/en not_active Expired - Fee Related
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5854149A (en) * | 1995-03-01 | 1998-12-29 | Kawasaki Steel Corporation Sumitomo Chemical Co., Ltd. | Paper-made stampable sheet, light-weight stampable sheet shaped body and method of producing light-weight stampable shaped body |
| EP0825010A2 (en) * | 1996-08-20 | 1998-02-25 | Sumitomo Chemical Company, Limited | A fiber-reinforced article and a method for producing the same |
| EP0825010A3 (en) * | 1996-08-20 | 1999-06-16 | Sumitomo Chemical Company, Limited | A fiber-reinforced article and a method for producing the same |
| NL1004268C2 (en) * | 1996-10-14 | 1998-04-15 | Dsm Nv | Shell-shaped molded part, a method for its manufacture and applications. |
| WO1998016366A1 (en) * | 1996-10-14 | 1998-04-23 | Dsm N.V. | Thermoplastic moulded part, a process for the production thereof and applications thereof |
| JP2001502259A (en) * | 1996-10-14 | 2001-02-20 | ディーエスエム エヌ．ブイ． | Thermoplastic molded parts, their production and their use |
| US6303070B1 (en) * | 1996-10-14 | 2001-10-16 | Dsm N.V. | Process for production of thermoplastic moulded part |
| US6605329B2 (en) | 1996-10-14 | 2003-08-12 | Dsm N.V. | Thermoplastic molded part, a process for the production thereof and applications thereof |
| CZ298638B6 (en) * | 1996-10-14 | 2007-12-05 | Dsm N. V. | Process for producing thermoplastic molded part and thermoplastic molded part per se |
| JP2015143007A (en) * | 2013-12-03 | 2015-08-06 | ザ・ボーイング・カンパニーＴｈｅＢｏｅｉｎｇ Ｃｏｍｐａｎｙ | Hybrid laminate and molded composite structures |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3375377B2 (en) | 2003-02-10 |
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