JPH06238014A - Racket frame - Google Patents
Racket frameInfo
- Publication number
- JPH06238014A JPH06238014A JP5054854A JP5485493A JPH06238014A JP H06238014 A JPH06238014 A JP H06238014A JP 5054854 A JP5054854 A JP 5054854A JP 5485493 A JP5485493 A JP 5485493A JP H06238014 A JPH06238014 A JP H06238014A
- Authority
- JP
- Japan
- Prior art keywords
- yarn
- fiber
- coated
- braid
- mixed
- 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.)
- Pending
Links
Landscapes
- Moulding By Coating Moulds (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】この発明は、テニス、バドミント
ン、スカッシュ等のラケットに有用なラケットフレーム
に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a racket frame useful for rackets for tennis, badminton, squash and the like.
【０００２】[0002]
【従来の技術】テニス、バドミントン、スカッシュ等に
使用される高性能のラケットフレームとして、熱硬化性
コンポジットを用いたものが知られており、例えば、強
化繊維の丸打ち組紐を発泡ウレタンなどの心材にかぶ
せ、熱硬化性樹脂に浸漬し、樹脂を含浸させ、余分な樹
脂を取り除いた後、金型へ投入し加熱硬化させて成形さ
れる。また、強化繊維に熱硬化性樹脂を含浸させて半硬
化状態としたプリプレグを任意の形にカットし、強化繊
維が所望の方向に配向するように積層しながらマンドレ
ルに巻き、型に投入して成形することも知られている。
しかしながら、これらの方法は、たいへん手間がかかる
労働集約的な製造方法であり、かつ熱硬化性樹脂のマト
リックスを使ったラケットフレームは、耐衝撃性に劣
り、ラケットを床や地面等に衝突させた際に大きな損傷
を受ける場合があり、同時に振動減衰性にも劣るため、
打球時に人体、特に肘に悪い影響を与える場合があっ
た。2. Description of the Related Art As a high-performance racket frame used for tennis, badminton, squash, etc., one using a thermosetting composite is known. For example, a round braid of reinforcing fiber is used as a core material such as urethane foam. It is covered with a resin, immersed in a thermosetting resin, impregnated with the resin, and after removing the excess resin, it is put into a mold and cured by heating to be molded. Further, a prepreg which is a semi-cured state in which a reinforcing fiber is impregnated with a thermosetting resin is cut into an arbitrary shape, wound around a mandrel while being laminated so that the reinforcing fiber is oriented in a desired direction, and put into a mold. Molding is also known.
However, these methods are labor-intensive manufacturing methods that are very time-consuming, and the racket frame using a matrix of thermosetting resin is inferior in impact resistance, and when the racket is collided with the floor, the ground, etc. May be seriously damaged, and at the same time it is inferior in vibration damping,
When hitting the ball, the human body, particularly the elbow, may be adversely affected.
【０００３】これに対して熱可塑性樹脂をマトリックス
とするコンポジットは、成形性に優れ、かつ耐衝撃性や
振動減衰性に優れている反面、強化繊維にあらかじめ熱
可塑性マトリックスを含浸させたものは、剛直であるた
め、型に投入するのが困難であった。そこで、この剛直
性を改良するため、連続強化繊維と連続熱可塑性マトリ
ックス繊維とを混繊してなるコンポジット用混繊糸を用
いることが提案されたが、連続繊維同士を混繊するため
には、連続強化繊維を弛ませた状態にしなければなら
ず、そのため得られた混繊糸における連続強化繊維の直
線性が乱れ、最終的には得られたラケットフレームの物
性が低下するという問題があった。On the other hand, a composite containing a thermoplastic resin as a matrix is excellent in moldability and is also excellent in impact resistance and vibration damping, but on the other hand, those obtained by impregnating reinforcing fibers with a thermoplastic matrix in advance are Since it was rigid, it was difficult to put it in the mold. Therefore, in order to improve this rigidity, it has been proposed to use a composite mixed yarn made by mixing continuous reinforcing fibers and continuous thermoplastic matrix fibers, but in order to mix continuous fibers with each other, However, the continuous reinforcing fibers have to be in a loosened state, which causes a problem that the linearity of the continuous reinforcing fibers in the obtained mixed fiber is disturbed and finally the physical properties of the obtained racket frame are deteriorated. It was
【０００４】また、連続強化繊維および連続熱可塑性マ
トリックス繊維は、モジュラスが著しく異なるため、こ
れらを均一に混繊することが非常に困難であり、混繊斑
が発生し易くなり、得られるラケットフレームの不良率
が高くなっていた。更に、混繊糸で丸打ち組紐を編組す
る場合、連続強化繊維と連続熱可塑性マトリックス繊維
との間の伸度差およびそれらの集束性の欠如が原因とな
って連続強化繊維が損傷を受け、操業性が著しく低下
し、かつラケットフレームに成形した場合に含浸斑が発
生し、得られたラケットフレームの耐衝撃性が劣る等の
問題があった。Further, since the continuous reinforcing fiber and the continuous thermoplastic matrix fiber have remarkably different moduli, it is very difficult to uniformly mix them, and it becomes easy to generate mixed fiber spots, and the resulting racket frame. The defect rate was high. Furthermore, when braiding a round braid with mixed fiber, the continuous reinforcing fibers are damaged due to the difference in elongation between the continuous reinforcing fibers and the continuous thermoplastic matrix fibers and the lack of their converging property, There was a problem that the operability was remarkably lowered, and when the racket frame was molded, impregnation unevenness was generated, and the resulting racket frame was inferior in impact resistance.
【０００５】一方、連続強化繊維に熱可塑性樹脂粉末を
担持させた材料も存在するが、これも組紐を編組する際
に熱可塑性樹脂粉末が脱落したり、強化繊維の損傷が生
じたりして操業性が著しく劣るため、得られたラケット
フレームに樹脂量の斑や含浸斑が生じ、ラケットフレー
ムとしての必要物性を満足できないという問題が生じて
いた。On the other hand, there are materials in which continuous reinforcing fibers carry a thermoplastic resin powder. However, this also causes the thermoplastic resin powder to fall off when the braid is braided, or the reinforcing fibers are damaged, which causes the operation. Since the properties are remarkably inferior, unevenness of the amount of resin and impregnated unevenness occur in the obtained racket frame, which causes a problem that the required physical properties as the racket frame cannot be satisfied.
【０００６】[0006]
【発明が解決しようとする課題】この発明は、前記の事
情を考慮してなされたものであり、熱可塑性マトリック
ス繊維および強化繊維を用いたラケットフレームにおけ
る耐衝撃性および振動減衰性を向上し、しかも品質を安
定させるものである。SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and improves impact resistance and vibration damping of a racket frame using a thermoplastic matrix fiber and a reinforcing fiber, Moreover, it stabilizes the quality.
【０００７】[0007]
【課題を解決するための手段】すなわち、この発明は、
熱可塑性マトリックス繊維および強化繊維の混繊糸に上
記熱可塑性マトリックス繊維と同種の繊維からなる被覆
糸を捲回被覆して被覆混繊糸とし、この被覆混繊糸を編
組して得られた複数本の丸打ち組紐を同心状に積層し、
得られたチューブ状の多重組紐を所望の金型に投入し加
熱、加圧成形して得られたラケットフレームにおいて、
上記の混繊糸が非連続の熱可塑性マトリックス繊維およ
び非連続の強化繊維からなる混繊度が３０％以上の実質
的に無撚の混繊糸であり、上記の多重組紐が２〜５本の
丸打ち組紐からなり、上記の被覆混繊糸における強化繊
維の体積含有率が３０〜６５％で、かつ被覆混繊糸にお
ける被覆糸の重量比が１〜１０％であり、上記の多重組
紐を構成する丸打ち組紐の打ち数が、最内層で２４打ち
以上４８打ち以下、最外層で３６打ち以上９６打ち以
下、中間層で２４打ち以上９６打ち以下であることを特
徴とするラケットフレームである。That is, the present invention is
A plurality of fibers obtained by braiding the mixed yarn of the thermoplastic matrix fiber and the reinforcing fiber with the coated yarn made of the same kind of the thermoplastic matrix fiber as the coated mixed yarn and winding the coated mixed yarn. Stack the round braids of books concentrically,
In the racket frame obtained by putting the obtained tubular multi-braid in a desired mold, heating and pressure molding,
The mixed yarn is a substantially non-twisted mixed yarn having a discontinuous thermoplastic matrix fiber and a discontinuous reinforcing fiber and a degree of mixed fiber of 30% or more, and the multi-braid has 2 to 5 yarns. A round braid, wherein the volume content of reinforcing fibers in the coated mixed fiber is 30 to 65%, and the weight ratio of the coated yarn in the coated mixed fiber is 1 to 10%. The racket frame is characterized in that the number of braided braids formed is 24 to 48 in the innermost layer, 36 to 96 in the outermost layer, and 24 to 96 in the intermediate layer. .
【０００８】この発明に用いられる強化繊維としては、
炭素繊維、アラミド繊維、ガラス繊維等が例示される
が、特に炭素繊維は物性、軽量性の点で好ましい。な
お、上記の強化繊維は、熱可塑性マトリックスとの接着
を良くするための表面処理がなされていることが好まし
い。一方、熱可塑性マトリックス繊維としては、ポリエ
チレン、ポリプロピレン、およびその共重合体や変成体
を含むポリオレフィン系繊維、ナイロン６、ナイロン６
６、ナイロン１２、ナイロン４５等のポリアミド繊維、
ポリエチレンテレフタレート、ポリブチレンテレフタレ
ート等のポリエステル系繊維、ポリカーボネート繊維、
ポリエーテルイミド繊維、ポリフェニレンサルファイド
繊維、ポリエーテルケトン繊維等が例示される。The reinforcing fibers used in this invention include
Examples thereof include carbon fiber, aramid fiber, glass fiber and the like, and carbon fiber is particularly preferable in terms of physical properties and light weight. In addition, it is preferable that the above-mentioned reinforcing fiber is subjected to a surface treatment for improving the adhesion with the thermoplastic matrix. On the other hand, examples of the thermoplastic matrix fiber include polyethylene, polypropylene, and a polyolefin-based fiber including a copolymer or modified product thereof, nylon 6, nylon 6
Polyamide fiber such as 6, nylon 12, nylon 45,
Polyester fibers such as polyethylene terephthalate and polybutylene terephthalate, polycarbonate fibers,
Examples thereof include polyetherimide fiber, polyphenylene sulfide fiber, polyetherketone fiber and the like.
【０００９】上記の熱可塑性マトリックス繊維と強化繊
維は混繊されており、その混繊度は３０％以上である。
ここで、混繊度は下記の式で定義される。 式中、Ｎは強化繊維の総本数を示し、Ｎc Ｘは強化繊維
がいくつかの群（グループ）に分割されているときのそ
のグループの個数を示し、Ｘは群の中における特定の１
個の群内のフィラメントの数を示している。上記の式に
おいて、１００（Ｎ−Ｘ）／（Ｎ−１）は、混繊状態を
意味し、Ｘが小さい程混繊状態が良好である。また、Ｎ
c Ｘ／（Ｎ／Ｘ）は重みである。The thermoplastic matrix fiber and the reinforcing fiber are mixed, and the degree of mixing is 30% or more.
Here, the degree of mixed fiber is defined by the following formula. In the formula, N represents the total number of reinforcing fibers, N c X represents the number of groups when the reinforcing fibers are divided into some groups, and X represents a specific 1 in the group.
The number of filaments in each group is shown. In the above formula, 100 (N−X) / (N−1) means a mixed fiber state, and the smaller the X, the better the mixed fiber state. Also, N
c X / (N / X) is a weight.
【００１０】また、上記の熱可塑性マトリックス繊維お
よび強化繊維は、共に実質的に無撚の非連続繊維であ
る。実質的に無撚とは、撚数が２回／ｍ以下であること
を意味する。なお、上記の熱可塑性マトリックス繊維お
よび強化繊維平均繊維長は、双方とも５０mm以上である
ことが好ましい。Further, both the thermoplastic matrix fiber and the reinforcing fiber are substantially non-twisted discontinuous fibers. Substantially no twist means that the twist number is 2 turns / m or less. It is preferable that both the thermoplastic matrix fiber and the reinforcing fiber average fiber length are 50 mm or more.
【００１１】上記の強化繊維と熱可塑性マトリックス繊
維とを混繊する手段としては、各連続繊維を別々に牽切
して非連続繊維からなるスライバーを得た後、それらの
スライバーを混合、牽切して混合スライバーを得る方
法、または連続強化繊維を牽切してスライバーとした
後、カード工程などにより得られた非連続のマトリック
ス繊維スライバーと練条工程またはは粗紡工程で混合し
て混合スライバーまたは混合粗糸を得る方法等のいずれ
でもよい。As means for mixing the above-mentioned reinforcing fibers and thermoplastic matrix fibers, each continuous fiber is separately stretched to obtain a sliver consisting of discontinuous fibers, and then the sliver is mixed and drafted. To obtain a mixed sliver, or after sliver by chopping continuous reinforcing fibers, mixed sliver mixed with a discontinuous matrix fiber sliver obtained by a card process or the like in a drawing step or a roving step or Any method such as a method for obtaining a mixed roving may be used.
【００１２】この発明では、上記のようにして得られた
実質的に無撚の混繊糸の糸形態を保持し、非連続の強化
繊維および熱可塑性マトリックス繊維の配向性を維持す
るため、上記無撚の混繊糸に上記の熱可塑性マトリック
ス繊維と同種の繊維からなる被覆糸を、例えば中空スピ
ンドルまたは他の任意の手段を利用して捲回被覆させる
が、この被覆糸の使用量は、上記混繊糸に対する重量比
で１〜１０％に設定される。In the present invention, since the yarn form of the substantially untwisted mixed yarn obtained as described above is maintained and the orientation of the discontinuous reinforcing fibers and the thermoplastic matrix fibers is maintained, An untwisted mixed yarn is coated with a coating yarn made of the same type of fiber as the thermoplastic matrix fiber, for example, by using a hollow spindle or any other means. The weight ratio to the mixed yarn is set to 1 to 10%.
【００１３】ここで言う、重量比は、下記の式により定
義する。 重量比＝｛Ｃ／（Ａ＋Ｂ＋Ｃ）｝×１００（％） Ａ：熱可塑性マトリックス繊維の量（ｇ／ｍ） Ｂ：強化繊維の量（ｇ／ｍ） Ｃ：被覆糸の量（ｇ／ｍ）The weight ratio mentioned here is defined by the following formula. Weight ratio = {C / (A + B + C)} × 100 (%) A: amount of thermoplastic matrix fiber (g / m) B: amount of reinforcing fiber (g / m) C: amount of coated yarn (g / m)
【００１４】上記被覆糸を構成する熱可塑性マトリック
ス繊維は、連続繊維または非連続繊維のいずれであって
もよく、連続繊維を使用する場合は、仮撚加工糸などの
加工糸を用いることが可能であり、一方、非連続繊維を
使用する場合は、テキスタイル加工性を満足できる拘束
力を有する状態であればよく、繊維長の長いステープル
から構成される撚数の少ない紡績糸等が好適である。な
お、上記の被覆糸は、細いものを２本使用し、一方をＳ
方向に、他方をＺ方向に捲回被覆することが好ましい。The thermoplastic matrix fibers constituting the above coated yarn may be either continuous fibers or discontinuous fibers. When continuous fibers are used, processed yarns such as false twisted yarns can be used. On the other hand, when the discontinuous fiber is used, it may be in a state of having a binding force that can satisfy the textile processability, and a spun yarn having a small number of twists composed of staples having a long fiber length is suitable. . In addition, the above-mentioned covered yarn uses two thin yarns, one of which is S
Direction, and the other is preferably wound in the Z direction.
【００１５】しかして、上記の被覆糸用熱可塑性マトリ
ックス繊維は、混繊糸用熱可塑性マトリックス繊維と同
種であることを必要とする。ただし、ここでいう同種と
は、例えばナイロン６とナイロン１２の組合せ、および
ホモのポリプロピレンと変性ポリプロピレンの組合せ等
を含み、全く同一であることを必要としない。従って、
分子量の異なるものを用いて粘度や結晶化度の異なる組
合せとしたり、ポリマーを変性させて融点の異なる組合
せとしたりすることも可能である。このような組合せの
中で、上記被覆糸用熱可塑性マトリックス繊維の溶融粘
度は、混繊糸用熱可塑性マトリックス繊維よりも小さい
ことが好ましい。また、上記被覆糸用熱可塑性マトリッ
クス繊維の融点は、混繊糸用熱可塑性マトリックス繊維
よりも低いことが好ましい。更に、上記被覆糸用熱可塑
性マトリックス繊維の繊度は、混繊糸用熱可塑性マトリ
ックス繊維よりも細いことが好ましい。なお、混繊糸用
および被覆糸用の熱可塑性マトリックス繊維は、通常、
繊維製造工程および後工程通過性を維持するため、表面
をいわゆる紡糸オイルで処理されるが、この種の処理剤
は、強化繊維とマトリックスとの界面の接着力を阻害す
るので、極力少なくすることが好ましい。However, it is necessary that the above-mentioned thermoplastic matrix fiber for coated yarn is of the same type as the thermoplastic matrix fiber for mixed yarn. However, the same type here includes, for example, a combination of nylon 6 and nylon 12, a combination of homo polypropylene and a modified polypropylene, and the like does not need to be the same. Therefore,
It is also possible to use those having different molecular weights to form a combination having different viscosities and crystallinities, or to modify the polymer to form a combination having different melting points. In such a combination, the melt viscosity of the thermoplastic matrix fiber for coated yarn is preferably smaller than that of the thermoplastic matrix fiber for mixed fiber. The melting point of the thermoplastic matrix fiber for coated yarn is preferably lower than that of the thermoplastic matrix fiber for mixed fiber. Further, the fineness of the thermoplastic matrix fiber for coated yarn is preferably smaller than that of the thermoplastic matrix fiber for mixed yarn. The thermoplastic matrix fiber for the mixed yarn and the coated yarn is usually
The surface is treated with so-called spinning oil in order to maintain the fiber production process and post-process passability, but this type of treatment agent inhibits the adhesive force at the interface between the reinforcing fiber and the matrix, so it should be minimized. Is preferred.
【００１６】この発明において、強化繊維と、混繊糸用
熱可塑性マクリックス繊維および被覆糸用熱可塑性マク
リックス繊維との混合比率は、ラケットフレームの必要
強度上、強化繊維の体積分率（ｖｆ）で３０〜６５％の
範囲内に設定される。この比率は、得ようとするフレー
ムの必要強度に応じて決定される。In the present invention, the mixing ratio of the reinforcing fibers to the thermoplastic macricks fibers for the mixed yarn and the thermoplastic macricks fibers for the covering yarn is such that the volume fraction of the reinforcing fibers (vf ) In the range of 30 to 65%. This ratio is determined according to the required strength of the frame to be obtained.
【００１７】このようにして得られた被覆混繊糸の太さ
は、組紐加工性、得られるフレームの必要物性や、フレ
ームの形状により選定すれば良い。好ましい範囲として
は、メートル番手をＮｍとしたとき、Ｎｍ＝０．６〜１
０．０が良く、更に好ましくはＮｍ＝０．７〜３．４で
あるが、特にこれらに限定されない。The thickness of the coated mixed fiber thus obtained may be selected depending on the workability of the braid, the required physical properties of the obtained frame, and the shape of the frame. As a preferable range, when the metric number is Nm, Nm = 0.6 to 1
0.0 is good, and more preferably Nm = 0.7 to 3.4, but is not particularly limited thereto.
【００１８】上記の被覆混繊糸を丸打ち組紐に編組し、
フレームの成形に供する。丸打ち組紐を使用することに
より、中空のフレームを得ることが可能であり、また強
化すべき方向に強化繊維を配向することができる。丸打
ち組紐は、公知の方法で編組することができる。その
際、打ち数と内径が被覆糸の太さおよび成形品の太さか
ら決定されるが、組上がった組紐を緊張させたり、弛め
たりすることで組角および内径が変えられる。従って、
内径に関しては、特に限定されないが、製紐工程の簡略
化の点から多重組紐を構成する組紐全数の内径を等しく
することが好ましい。そして、積層される個々の組紐の
打ち数は、最内層が２４打ち以上４８打ち以下、最外層
が３６打ち以上９６打ち以下、中間層が２４打ち以上９
６打ち以下にそれぞれ設定されるが、最内層および中間
層を等しくし、最外層のみを多くすることが好ましい。The above coated mixed yarn is braided into a round braid,
Used for frame molding. By using round braid it is possible to obtain a hollow frame and to orient the reinforcing fibers in the direction to be reinforced. The round braid can be braided by a known method. At that time, the number of taps and the inner diameter are determined from the thickness of the covering thread and the thickness of the molded product, but the braid angle and the inner diameter can be changed by tensioning or loosening the assembled braid. Therefore,
The inner diameter is not particularly limited, but it is preferable to make the inner diameters of all the braids forming the multiple braid equal to each other from the viewpoint of simplifying the braiding process. The number of braids to be laminated is 24 to 48 in the innermost layer, 36 to 96 in the outermost layer, and 24 to 9 in the intermediate layer.
Although the number of strokes is set to 6 or less, it is preferable to make the innermost layer and the intermediate layer equal and increase only the outermost layer.
【００１９】上記の多重組紐は、必要に応じて補強を必
要とする部分に補強材を添付した後、ラケットフレーム
の形状の金型に投入して成形する。この成形は、中空の
パイプ状成形材料の内側から圧力をかけ、成形材料を金
型の内壁に押し付ける内圧成形が好ましい。その際、使
用している熱可塑性マトリックス繊維の融点以上の温度
に加熱し、熱可塑性マトリックス繊維を溶融させ、これ
を強化繊維間に含浸させて成形する。次いで、圧力を加
えたまま冷却し、マトリックスが固化する温度以下、好
ましくはＴｇ以下の温度に冷却して成形品を取り出す。
内部から圧力をかける方法としては、シリコーンチュー
ブなどのいわゆるバグ材を成形材料の中空部に挿入し、
該バグ材に高圧流体を送り込み、それにより加圧するの
が好ましい。流体としては、取扱い易さの点から気体が
好ましい。また、発泡剤を用いることもでき、この場合
はバグ材を省略することができる。The above-mentioned multi-braid is formed by attaching a reinforcing material to a portion requiring reinforcement, if necessary, and then inserting it into a mold in the shape of a racket frame. This molding is preferably internal pressure molding in which pressure is applied from the inside of the hollow pipe-shaped molding material and the molding material is pressed against the inner wall of the mold. At that time, the thermoplastic matrix fiber is heated to a temperature equal to or higher than the melting point of the thermoplastic matrix fiber used to melt the thermoplastic matrix fiber, and the thermoplastic matrix fiber is impregnated between the reinforcing fibers to be molded. Next, the product is cooled with pressure applied, and cooled to a temperature at which the matrix solidifies, preferably Tg or less, and the molded product is taken out.
As a method of applying pressure from the inside, so-called bag material such as silicone tube is inserted into the hollow part of the molding material,
It is preferable to send a high-pressure fluid to the bag material and thereby pressurize it. As the fluid, gas is preferable from the viewpoint of easy handling. A foaming agent can also be used, and in this case, the bag material can be omitted.
【００２０】[0020]
【作用】複数本の丸打ち組紐からなる多重組紐を金型に
投入して成形する際、丸打ち組紐を構成する混繊糸が実
質的に無撚の糸であるため、強化繊維の強度が十分に活
用され、ラケットフレームに必要な強度が容易に得られ
る。ただし、上記混繊糸の撚数が２回／ｍを超えると、
混繊糸としての形態保持性が良好になる反面、撚の影響
によって強化効率が低下し、ラケットフレームとしての
強度が不足する。[Operation] When a multi-braid consisting of a plurality of round braids is put into a mold and molded, the strength of the reinforcing fiber is increased because the mixed filament yarns forming the round braid are substantially untwisted yarns. It is fully utilized and easily provides the strength needed for a racket frame. However, if the number of twists of the mixed yarn exceeds 2 times / m,
While the shape retention of the mixed fiber is improved, the reinforcing efficiency is reduced due to the influence of twisting, and the strength of the racket frame is insufficient.
【００２１】また、上記の混繊糸を構成する強化繊維お
よび熱可塑性マトリックス繊維が共に非連続繊維である
ため、混繊が容易で、高度の混繊度が得られ、さらに糸
の長手方向の混繊斑がなく、混繊度が均一になる。ま
た、両繊維が非連続繊維であるため、成形時に強化繊維
が若干滑って金型内壁に密着し易くなり、また滑ること
によりバグ材が支障なく膨張できるため、成形材料に圧
力が十分に加わり、使用する混繊糸の混繊度が高いこと
とあいまって、熱可塑性マトリックスが強化繊維に充分
含浸し、品質の良いラケットフレームが得られる。そし
て、混繊度が３０％以上であるため、熱可塑性マトリッ
クス繊維の溶融時における強化繊維への含浸が短時間に
行われ、しかも均一な成形品が得られる。なお、混繊度
が３０％未満の場合は、含浸に時間がかかり不経済であ
り、また含浸が不十分に、かつ不均一になるため、ラケ
ットフレームとしての機械的性質が低下する。Further, since the reinforcing fiber and the thermoplastic matrix fiber which compose the above-mentioned mixed fiber are both discontinuous fibers, it is easy to mix the fibers, and a high degree of mixing is obtained, and further, the fibers are mixed in the longitudinal direction. There is no fibrosis and the degree of mixing is uniform. In addition, since both fibers are discontinuous fibers, the reinforcing fibers are slightly slipped during the molding to easily adhere to the inner wall of the mold, and the sliding allows the bag material to expand without hindrance, so that sufficient pressure is applied to the molding material. Combined with the high degree of mixedness of the mixed fiber used, the thermoplastic matrix is sufficiently impregnated with the reinforcing fiber, and a high quality racket frame can be obtained. Further, since the degree of fiber mixing is 30% or more, impregnation into the reinforcing fibers at the time of melting the thermoplastic matrix fibers is performed in a short time, and moreover, a uniform molded product can be obtained. If the degree of mixing is less than 30%, the impregnation takes time and is uneconomical, and the impregnation becomes insufficient and non-uniform, so that the mechanical properties of the racket frame deteriorate.
【００２２】上記の混繊糸は、熱可塑性マトリックス繊
維からなる被覆糸で捲回被覆され、得られた被覆混繊糸
で丸打ち組紐が編組されるので、混繊糸が非連続繊維か
らなる無撚糸であるにもかかわらず、強化繊維が損傷し
たり、飛散したりすることなく、かつ強化繊維の配向状
態が乱れることがなく、容易に組紐を得ることができ、
さらに成形に供するための材料として所定の形状に裁断
して金型に容易に投入することができる。ただし、被覆
混繊糸における被覆糸の重量比が１％未満の場合は効果
がなく、反対に１０％を超えた場合は、被覆混繊糸にお
ける被覆糸の捲回被覆跡がレジンリッチ部として成形品
の表面に痕跡を残し、表面外観を損ない、かつ成形品の
機械的物性を低下させると共に、成形中に被覆糸の拘束
力が働いて強化繊維のバラケが不充分となり、そのため
繊維束間の物性が不足し、成形品に加わる曲げ応力によ
って繊維束に亀裂が発生する。すなわち、被覆糸の重量
比を１〜１０％に設定することにより、組紐加工性およ
び成形で得られるコンポジット（ラケットフレーム）の
物性を両立させることができる。なお、被覆糸として特
に細デニールのものを２本使用し、一方をＳ方向に、他
方をＺ方向に捲回した場合は、組紐加工性および成形後
の外観が一層向上する。The above-mentioned mixed fiber is wound and coated with a covering yarn made of a thermoplastic matrix fiber, and a round braid is braided with the obtained coated mixed yarn, so that the mixed yarn is a discontinuous fiber. Even though it is a non-twisted yarn, the reinforcing fiber is not damaged or scattered, and the orientation state of the reinforcing fiber is not disturbed, and the braid can be easily obtained,
Further, it can be cut into a predetermined shape as a material to be used for molding and easily put into a mold. However, when the weight ratio of the coated yarn in the coated mixed fiber is less than 1%, there is no effect. On the contrary, when it exceeds 10%, the wound coating trace of the coated yarn in the coated mixed fiber becomes a resin rich portion. It leaves traces on the surface of the molded product, impairs the surface appearance, and reduces the mechanical properties of the molded product, and the binding force of the coated yarn acts during molding, resulting in insufficient dispersion of the reinforcing fibers. Has insufficient physical properties and cracks occur in the fiber bundle due to bending stress applied to the molded product. That is, by setting the weight ratio of the coated yarn to 1 to 10%, it is possible to achieve both the braid processability and the physical properties of the composite (racket frame) obtained by molding. When two fine denier fibers are used as the covering yarn and one is wound in the S direction and the other is wound in the Z direction, the workability of the braid and the appearance after molding are further improved.
【００２３】上記のラケットフレームは、強化繊維を含
む無撚糸からなる丸打ち組紐で構成され、上記の強化繊
維が上記組紐の中心軸線に対して螺旋状に配向されるの
で、上記のフレームは周方向および軸方向の両方に強度
を有し、ラケットフレームとして好ましい物性が付与さ
れる。そして、上記の組紐は、組角度により強度の必要
な方向に自由に配向させることができる。また、組紐の
中空部に中央糸を入れることにより軸方向の強度を一層
向上させることができる。また、この発明では、上記丸
打ち組紐の複数本が同心状に積層された多重組紐で成形
するので、成形後に組目の間に穴の開くことがない。た
だし、積層する組紐の本数が５本を超えると、成形品の
重量が過大になる。The racket frame is composed of a round braid made of untwisted yarn containing reinforcing fibers, and the reinforcing fibers are spirally oriented with respect to the central axis of the braid, so that the frame is surrounded by a circumference. It has strength in both the axial direction and the axial direction, and imparts physical properties preferable as a racket frame. The braid can be freely oriented in a direction requiring strength depending on the braid angle. Further, by inserting a central yarn in the hollow portion of the braid, the strength in the axial direction can be further improved. Further, according to the present invention, since a plurality of the round braided braids are molded by the multi-braided braid concentrically laminated, no hole is formed between the braids after molding. However, if the number of braids to be laminated exceeds 5, the weight of the molded product becomes excessive.
【００２４】また、上記の多重組紐を構成する丸打ち組
紐の打ち数は、内層から外層に向かって順に多くするこ
とにより、その同心状の積層が容易になり、かつ内層側
の被覆混繊糸の弛みを防ぎ、表面状態の優れた成形品が
得られる。また、各層の内径を等しくした場合は、積層
の際に外側の層の内径を広げることにより、被覆混繊糸
の傾斜角度が大きくなるので、編組の際に外層用組紐の
組角度を小さく設定し、積層の際に内径を広げて組角を
大きくすると、この組角が内層と同程度になり、組目の
開きの無い表面状態の優れた成形品が得られる。なお、
得られた成形品は、バリを取り除いた後、必要に応じて
ガット用の穴を開け、また、表面に修飾をほどこし、グ
リップを取付け、ガットを張ってラケット等に加工され
る。Further, by increasing the number of round braids constituting the above-mentioned multiple braid in order from the inner layer to the outer layer, the concentric lamination is facilitated and the coated mixed yarn on the inner layer side is facilitated. It is possible to obtain a molded product having an excellent surface condition by preventing the slack from forming. Also, when the inner diameters of the layers are made equal, the angle of inclination of the coated mixed fiber is increased by widening the inner diameter of the outer layer during lamination, so the braid angle for the outer layer braid is set small during braiding. However, when the inner diameter is widened and the assembly angle is increased during lamination, the assembly angle becomes approximately the same as that of the inner layer, and a molded product having an excellent surface condition without opening of the assembly can be obtained. In addition,
After removing the burrs, the obtained molded product is processed into a racket or the like by forming a hole for a gut if necessary, modifying the surface of the molded product, attaching a grip, and stretching the gut.
【００２５】[0025]
実施例 ナイロン６のフィラメント束を牽切して平均繊維長１０
０mmの混繊糸用熱可塑性マトリックス繊維からなるスラ
イバーを得た。また、炭素繊維のフィラメント束を牽切
して平均繊維長１００mmの強化繊維からなるスライバー
を得た。上記２種のスライバーを練条機にて混合し、ド
ラフトをかけて重量２３６ゲレン／６ヤードの混合スラ
イバーとした。該混合スライバーにドラフトを加えて無
撚の混繊糸とした後、この混繊糸を中空スピンドルに供
給して走行させ、この混繊糸に２本の被覆糸（ナイロン
６からなる４０デニール１２フィラメントのマルチフィ
ラメント糸）をＳ方向およびＺ方向にそれぞれ２６０Ｔ
／ｍの撚数で捲回被覆してＮｍ１．７の被覆混繊糸を作
成した。この被覆混繊糸における強化繊維の体積分率は
５８％であり、被覆糸の重量比率は２．０％であった。
また、混繊糸の混繊度は６５％であった。図２は、この
ようにして得られた被覆混繊糸１１の外観を示し、１２
は平均繊維長１００mmのナイロン６繊維と炭素繊維とか
らなる無撚の混繊糸、１３はナイロン６のフィラメント
からなる被覆糸である。Example Nylon 6 filament bundles are chopped to obtain an average fiber length of 10
A sliver consisting of 0 mm thermoplastic matrix fibers for mixed yarn was obtained. Further, a filament bundle of carbon fibers was cut off to obtain a sliver made of reinforcing fibers having an average fiber length of 100 mm. The above two kinds of sliver were mixed with a kneading machine and drafted to obtain a mixed sliver having a weight of 236 gelen / 6 yards. Draft is added to the mixed sliver to make a non-twisted mixed fiber, and the mixed fiber is fed to a hollow spindle to run, and two coated yarns (40 denier 12 made of nylon 6 12 260T each in the S and Z directions
A coated mixed yarn of Nm1.7 was prepared by winding with a twist number of / m. The volume fraction of the reinforcing fibers in the coated mixed fiber was 58%, and the weight ratio of the coated yarn was 2.0%.
The degree of mixed fiber of the mixed fiber was 65%. FIG. 2 shows the appearance of the coated mixed fiber 11 thus obtained,
Is a non-twisted mixed fiber made of nylon 6 fiber and carbon fiber having an average fiber length of 100 mm, and 13 is a coated yarn made of nylon 6 filament.
【００２６】上記の被覆混繊糸１１を用い、４８打ちの
丸打組機で組角度２５度、内径１５mmの丸打ち組紐を、
また６４打ちの丸打組機を用いて組角度と内径が上記と
同じ丸打ち組紐をそれぞれ編組した。図３に示すよう
に、上記の４８打ち組紐を内層用組紐１６および中間層
用組紐１７の双方に使用し、また６４打ち組紐を外層用
組紐１８に使用し、これらを同心状に積層して３層構造
の多重組紐１５を作成した。この実施例の多重組紐１５
にシリコーンチューブを挿入し、テニスラケットの成形
用金型に投入した。この投入に際し、ラケットフレーム
１０（図１参照）のガット張り部１０ａに上記の被覆混
繊糸１１からなる１４mm幅の織物を一層に配置し、ガッ
ト用穴を開けても強度が低下しないように補強した。ま
た、ヨーク部１０ｂには上記と同じ多重組紐１５の中に
発泡剤を入れ、両端をフレーム用丸打ち組紐に上記の被
覆混繊糸１１で縛り付けた。金型を２５５℃に加熱し、
シリコーンチューブ内に空気を送り、１５kg／cm2 の圧
力を与え、２０分間保持し、その後、圧力をかけたまま
室温まで２０分で冷却した。Using the above-mentioned coated mixed yarn 11, a round striking braid with a striking angle of 25 degrees and an inner diameter of 15 mm was formed by a round striking machine of 48 striking.
Further, using a round striking machine of 64 striking, braiding round striking braids having the same braid angle and inner diameter as above were braided. As shown in FIG. 3, the above 48 braids were used for both the inner layer braid 16 and the intermediate layer braid 17, and the 64 braids were used for the outer layer braid 18, which were concentrically laminated. A multi-layer braid 15 having a three-layer structure was created. Multiple braid 15 of this embodiment
The silicone tube was inserted into and was placed in a mold for molding a tennis racket. At the time of this charging, a 14 mm wide woven fabric composed of the above-mentioned coated mixed yarn 11 is arranged in one layer on the gut tension part 10a of the racket frame 10 (see FIG. 1) so that the strength does not decrease even if the gut hole is opened. Reinforced. Further, in the yoke portion 10b, a foaming agent was put in the same multiple braid 15 as described above, and both ends were bound to the round braid for frame with the above-mentioned coated mixed yarn 11. Heat the mold to 255 ° C,
Air was blown into the silicone tube, a pressure of 15 kg / cm 2 was applied, the pressure was kept for 20 minutes, and then the temperature was cooled to room temperature with pressure applied in 20 minutes.
【００２７】得られた実施例のテニス用ラケットフレー
ム１０は、外観良好であり、重量は２０５ｇであった。
このラケットフレーム１０にガット用穴を開け、グリッ
プを付けガットを６０ポンドの張力で張った。３０００
球の試打をしてみたところ、何ら異状が生じることはな
く、かつ心地良い打球感が得られた。The tennis racket frame 10 of the obtained example had a good appearance and weighed 205 g.
A hole for a gut was opened in the racket frame 10, a grip was attached, and the gut was tensioned with a tension of 60 pounds. 3000
When I tried a ball, no abnormalities were found and a comfortable shot feeling was obtained.
【００２８】比較例１ 上記の実施例における２本の被覆糸１３の代わりに２０
デニール１２フィラメントのナイロン６フィラメント糸
を１本だけ使用しＳ方向に捲回被覆する以外は、実施例
と全く同様にして被覆混繊糸を作成した。この被覆混繊
糸における被覆糸の重量比は０．５％であった。この被
覆混繊糸を用いて、実施例と同様の組紐を作成したとこ
ろ、加工性が悪くて編組時に炭素繊維が損傷、切断、脱
落し、著しく作業環境を悪化させると共に、得られた組
紐の表面状態も毛羽が非常に多く、繊維配列に乱れがあ
り、ラケットを成形することができなかった。Comparative Example 1 In place of the two covered yarns 13 in the above example, 20
A coated mixed yarn was prepared in exactly the same manner as in the example except that only one nylon 6 filament yarn of denier 12 filaments was used and wound and coated in the S direction. The weight ratio of the coated yarn in this coated mixed fiber was 0.5%. When a braid similar to that of the example was prepared using this coated mixed yarn, the carbon fiber was damaged, cut, and dropped during braiding due to poor processability, and the working environment was significantly deteriorated. The surface condition was very fluffy, and the fiber arrangement was disturbed, so that the racket could not be formed.
【００２９】比較例２ 混繊糸の混繊度を１２％にする以外は、上記の実施例と
同様にして被覆混繊糸を作成し、さらに組紐を編組し
た。上記の被覆混繊糸は、製紐時に炭素繊維の損傷、切
断が多少みられたが、編組することは一応可能であっ
た。得られた組紐で実施例と同様にテニス用ラケットフ
レームを成形した。得られたラケットフレームには、含
浸不良箇所がみられた。実際に６０ポンドの張力でガッ
トを張ったところフレームが割れる結果になった。Comparative Example 2 A coated mixed fiber was prepared in the same manner as in the above-mentioned example except that the mixed fiber degree was 12%, and the braid was braided. In the above-mentioned coated mixed fiber, the carbon fiber was somewhat damaged or cut during the braiding, but it could be braided for the time being. A racket frame for tennis was formed from the obtained braid as in the example. In the obtained racket frame, defective impregnation was found. When the gut was actually tensioned with 60 pounds of tension, the result was that the frame cracked.
【００３０】比較例３ 被覆糸として３００デニール、６０フィラメントのナイ
ロン６フィラメント糸を２本用い、その重量比を１５％
にする以外は、実施例と同様にして被覆混繊糸および組
紐を作成した。被覆混繊糸の製紐性は良好であったが、
全般に糸が硬くフレキシビリティに欠けていた。この組
紐で同様にラケットフレームを成形したが、被覆糸の拘
束力が強すぎるため、フレーム表面に多数の樹脂リッチ
部が形成され、６０ポンドの張力でガットを張って試打
したところ、２０００球でフレームが割れて使用不能に
なった。Comparative Example 3 Two nylon 6 filament yarns of 300 denier and 60 filaments were used as coating yarns, and their weight ratio was 15%.
A coated mixed yarn and a braid were prepared in the same manner as in the example except that The coated mixed yarn had good braidability,
The yarn was generally hard and lacked flexibility. A racket frame was similarly formed with this braid, but because the binding force of the covering thread was too strong, a large number of resin-rich parts were formed on the frame surface, and when a gut was tensioned with a tension of 60 pounds, it was struck with 2000 balls. The frame broke and became unusable.
【００３１】比較例４ 強化繊維として６Ｋの炭素繊維の連続繊維を、マトリッ
クスとしてナイロン６のマルチフィラメント糸（１５０
０デニール５００フィラメント）をそれぞれ用い、両繊
維をインターレーサーを用いて混繊し、混繊度１８％、
太さ５３００デニール、炭素繊維含有量５８体積％の混
繊糸を得た。この混繊糸を用い、実施例と同様に４８打
ち組紐および６４打ち組紐を編組した。この編組の際、
炭素繊維の損傷と切断がかなりみられ、実施例に比して
製紐性が著しく劣り、作業環境の悪化が見られた。ま
た、得られた組紐の表面には非常に多くの毛羽が見られ
た。実施例と同じ組角度、内径、積層数、成形方法で、
ラケットフレームを成形した。得られたフレームには、
強化繊維の乱れが多数みられ、また樹脂リッチのところ
もみられた。実施例と同様に６０ポンドでガットを張ろ
うとしたが、フレームが割れる結果になった。Comparative Example 4 A continuous fiber of 6K carbon fiber was used as the reinforcing fiber, and a nylon 6 multifilament yarn (150) was used as the matrix.
0 denier 500 filaments), and both fibers were mixed with an interlacer, and the degree of mixing was 18%,
A mixed fiber having a thickness of 5300 denier and a carbon fiber content of 58% by volume was obtained. Using this mixed fiber, a 48 braid and a 64 braid were braided in the same manner as in the example. During this braiding,
The carbon fiber was considerably damaged and cut, and the stringing property was remarkably inferior to that of the example, and the working environment was deteriorated. Also, a great number of fluffs were found on the surface of the obtained braid. With the same set angle, inner diameter, number of layers, and molding method as in the example,
The racket frame was molded. In the obtained frame,
There were many disturbances in the reinforcing fibers, and some were resin rich. Attempting to gut at 60 pounds as in the example resulted in the frame cracking.
【００３２】比較例５ 強化繊維として６Ｋの炭素繊維の連続繊維を、またマト
リックスとしてナイロン６の非連続繊維を用いた。ただ
し、ナイロン６は、フィラメントを牽切後、ドラフト工
程の最終ローラーで、開繊状態の連続炭素繊維に重ねる
ことにより混繊した。ナイロン６の平均繊維長は８０mm
であった。混繊後１０回／ｍのＳ撚をかけて形態を保持
させ、混繊度２４％、太さ５５００デニール、炭素繊維
含有率５７体積％の混繊糸を得た。この混繊糸で実施例
と同様に４８打ち組紐と６４打ち組紐を編組した。加工
性は比較例４よりも改善された。実施例と同じ組角度、
内径、積層数、成形方法でテニス用ラケットフレームを
成形した。得られたフレームには、強化繊維に沿って樹
脂リッチの線が見られた。また、強化繊維の乱れが至る
ところで見られた。実施例と同様にガットを張って試打
を行ったところ、１０００球程度でフレームが割れて使
用不能になった。Comparative Example 5 A continuous fiber of 6K carbon fiber was used as the reinforcing fiber, and a discontinuous fiber of nylon 6 was used as the matrix. However, Nylon 6 was mixed by overlapping the continuous carbon fibers in the opened state with the final roller in the drafting process after the filament was drafted. The average fiber length of nylon 6 is 80 mm
Met. After mixing, S-twisting was performed 10 times / m to maintain the shape, and a mixed fiber having a degree of fiber mixing of 24%, a thickness of 5500 denier, and a carbon fiber content of 57 volume% was obtained. 48 and 64 braided braids were braided with this mixed fiber as in the example. The workability was improved as compared with Comparative Example 4. Same set angle as in the example,
A racket frame for tennis was molded by the inner diameter, the number of layers and the molding method. Resin-rich lines were seen along the reinforcing fibers in the resulting frame. Disturbances in the reinforcing fibers were also observed everywhere. When a gut was stretched and a trial hit was performed in the same manner as in the example, the frame was broken at about 1000 balls and became unusable.
【００３３】比較例６ 比較例５で得られた混繊糸に２本の被覆糸（４０デニー
ル１２フィラメントのナイロン６フィラメント糸）をＳ
方向およびＺ方向に捲回被覆して混繊度２４％、太さ５
５００デニール、炭素繊維含有率５７体積％の被覆混繊
糸を得た。この被覆混繊糸で実施例と同様に４８打ち組
紐および６４打ち組紐を編組した。加工性は比較例４よ
りも改善された。実施例と同じ組角度、内径、積層数、
成形方法でテニス用ラケットフレームを成形した。得ら
れたフレームには、樹脂リッチの部分が存在した。ま
た、強化繊維の乱れた箇所が多数認められた。そして、
実施例と同様にガットを張って試打を行ったところ、１
０００球程度でフレームにひびが入り使用できなくなっ
た。Comparative Example 6 Two coated yarns (40 denier 12 filament nylon 6 filament yarn) were added to the mixed fiber yarn obtained in Comparative Example 5 as S.
Coated in the Z direction and the Z direction with a mixed fiber degree of 24% and a thickness of 5
A coated mixed yarn having a denier of 500 and a carbon fiber content of 57% by volume was obtained. A 48 braided braid and a 64 braided braid were braided with this coated mixed fiber as in the example. The workability was improved as compared with Comparative Example 4. Same set angle, inner diameter, number of layers,
A tennis racket frame was molded by the molding method. The obtained frame had a resin-rich portion. In addition, many places where the reinforcing fibers were disturbed were recognized. And
When a gut was stretched and a trial hit was performed as in the example, 1
After about 000 balls, the frame cracked and became unusable.
【００３４】比較例７ 強化繊維として炭素繊維の連続繊維を、マトリックス樹
脂としてナイロン６からなる平均粒径８０μｍのパウダ
ーを使用した。開繊した炭素繊維に静電気発生装置で電
荷をのせた後、この炭素繊維を上記のパウダーが空気で
流動している流動床中に通して炭素繊維間にナイロン６
パウダーを坦持させた。得られた糸（強化繊維含有率５
０体積％、太さ５３００デニール）で実施例と同様の組
紐に編組したところ、炭素繊維の損傷、切断が多くて加
工性が著しく劣り、かつマトリックス用パウダーが多量
に脱落して作業環境が悪化した。また、得られた組紐の
表面には非常に多くの毛羽が認められた。この組紐を使
用し、実施例と同じ組角度、内径、積層数、成形方法で
ラケットフレームを成形した。得られたフレームには、
強化繊維の乱れと樹脂不足による含浸不良部が見られ、
実施例と同様にガットを張ったところ、フレームが割
れ、使用不能であった。Comparative Example 7 Carbon fiber continuous fibers were used as the reinforcing fibers, and nylon 6 powder having an average particle size of 80 μm was used as the matrix resin. After charging the opened carbon fibers with an electrostatic generator, the carbon fibers are passed through a fluidized bed in which the above-mentioned powder is flowing by air, and nylon 6 is put between the carbon fibers.
Made the powder carry. Obtained yarn (reinforcing fiber content 5
When braided into the same braid as in the example with 0% by volume and 5300 denier, the carbon fiber was damaged and cut a lot and the workability was remarkably inferior, and a large amount of matrix powder fell off to deteriorate the working environment. did. Moreover, a large number of fluffs were recognized on the surface of the obtained braid. Using this braid, a racket frame was molded with the same braid angle, inner diameter, number of layers, and molding method as in the example. In the obtained frame,
Disturbance of reinforcing fibers and defective impregnation due to lack of resin are seen,
When the gut was stretched in the same manner as in the example, the frame was cracked and unusable.
【００３５】比較例８ 実施例と同じ被覆混繊糸を用いて、４８打ちの丸打ち組
紐を得た。これを１本だけ用いて単層構造のラケットフ
レームを成形した。得られた成形品には、組目に対応す
る多数箇所に穴が開いており、使用できるものではなか
った。Comparative Example 8 Using the same coated mixed yarn as in Example, a 48-round round braid was obtained. A single racket frame was molded using only one of these. The obtained molded product was not usable because it had holes at many points corresponding to the stitches.
【００３６】比較例９ 実施例と同じ被覆混繊糸を用いて、３２打ちの丸打ち組
紐および４８打ち組紐を編組し、３２打ち組紐を４重に
積層し、その外側に４８打ち組紐を３重に積層し、合計
７層構造のフレームを成形した。得られたフレームに
は、組紐の密度が粗いことに起因するレジンリッチ部が
発生し、また重量が３１０ｇと過大であり、打球時のス
イングの負担が増え、使用感は余り良くなかった。Comparative Example 9 Using the same coated mixed yarn as in Example, 32 round braided braids and 48 braided braids were braided, 32 braided braids were laminated in four layers, and 48 braided braids were provided outside the braided braid. The layers were laminated in layers to form a frame having a total of 7 layers. The obtained frame had a resin rich portion due to the coarse density of the braid, and had an excessive weight of 310 g, which increased the load of swing at the time of hitting the ball, and the usability was not very good.
【００３７】比較例１０ 実施例の被覆糸を省略する以外は実施例と同様にして丸
打ち組紐を作成しようとしたが、糸形態を保持すること
ができず、編組が不可能であった。Comparative Example 10 An attempt was made to make a round braided cord in the same manner as in Example except that the covering yarn of Example was omitted, but the yarn form could not be retained and braiding was impossible.
【００３８】比較例１１ 実施例の混繊糸に被覆糸を捲回する代わりにＳ方向に加
撚し、撚数１０回／ｍ、混繊度６２％、炭素繊維含有率
５８体積％の混繊糸を得た。この混繊糸で実施例と同様
の４８打ち組紐および６４打ち組紐を編組した。加工性
は比較例８より改善された。実施例と同じ組角度、内
径、積層数、成形方法でラケットフレームを成形した。
得られたフレームには、強化繊維に沿って樹脂リッチの
線が認められ、実施例と同様にガットを張って試打を行
ったところ、１５００球程度でフレームが割れて使用不
能になった。Comparative Example 11 A mixed fiber having a twist number of 10 times / m, a mixing degree of 62%, and a carbon fiber content rate of 58% by volume is twisted in the S direction instead of winding the coated yarn on the mixed yarn of the example. I got a thread. The same 48-strand braid and 64-strand braid as in the example were braided with this mixed fiber. The workability was improved as compared with Comparative Example 8. A racket frame was molded with the same set angle, inner diameter, number of layers, and molding method as in the example.
In the obtained frame, resin-rich lines were observed along the reinforcing fibers, and when a gut was stretched in the same manner as in the example to make a trial hit, the frame was broken at about 1500 balls and became unusable.
【００３９】比較例１２ 実施例において、丸打ち組紐の組角度を２５度とし、内
層に６４打ち組紐を２層、また外層に４８打ち組紐を１
層使用する以外は、実施例と同様にしてラケットフレー
ムを成形した。得られたフレームの表面には多数のあば
たがみられ、製品として不良であった。Comparative Example 12 In the example, the braiding angle of the round braid was 25 degrees, the inner braiding layer was 64 braiding braids, and the outer layer was 48 braiding braids.
A racket frame was molded in the same manner as in the example except that layers were used. Many pockmarks were found on the surface of the obtained frame, which was a defective product.
【００４０】[0040]
【発明の効果】この発明のラケットフレームは、以上の
ように構成されており、マトリックスとして熱可塑性樹
脂を用いているため、熱硬化性樹脂を使用した場合に比
してキュアリング工程が不要であり、強靱性が向上し、
振動減衰性に優れていてラケット等に最適であり、かつ
材料としてのシェルフライフが極めて長く、また硬化剤
やマトリックス液の毒性がなく、これらの液状物による
汚れがない等の長所を有している。また、丸打ち組紐を
用いるので成形が容易である。一方、熱可塑性樹脂複合
材料との比較においては、マトリックスが繊維状態で使
用され、強化繊維との混繊糸が同じく熱可塑性マトリッ
クス繊維からなる被覆糸で捲回被覆されているので、組
紐加工性に優れている。また、混繊糸を構成する強化繊
維およびマトリックス繊維の双方に非連続繊維を用いて
いるので、混繊度が高くなり、成形性が向上し、ラケッ
トフレームとしての外観および物性が向上する。The racket frame of the present invention is constructed as described above and uses the thermoplastic resin as the matrix, so that the curing step is unnecessary as compared with the case where the thermosetting resin is used. Yes, improved toughness,
It has excellent vibration damping properties, is ideal for rackets, etc., has an extremely long shelf life as a material, has no toxicity of curing agents and matrix liquids, and has no stains due to these liquids. There is. Moreover, since a round braid is used, the molding is easy. On the other hand, in comparison with the thermoplastic resin composite material, the matrix is used in a fibrous state, and the mixed yarn with the reinforcing fiber is wound and coated with the coating yarn also made of the thermoplastic matrix fiber. Is excellent. In addition, since discontinuous fibers are used as both the reinforcing fibers and the matrix fibers that make up the mixed fiber, the degree of mixing is increased, the moldability is improved, and the appearance and physical properties of the racket frame are improved.
【図１】ラケットフレームの平面図である。FIG. 1 is a plan view of a racket frame.
【図２】被覆混繊糸の斜視図である。FIG. 2 is a perspective view of a coated mixed fiber.
【図３】三重構造の丸打ち組紐の斜視図である。FIG. 3 is a perspective view of a round braid having a triple structure.
１０：テニス用ラケットフレーム １１：被覆混繊糸 １２：混繊糸 １３：被覆糸 １５：３層構造の丸打ち組紐 １６、１７、１８：丸打ち組紐 10: Racket frame for tennis 11: Coated fiber yarn 12: Mixed fiber yarn 13: Coated yarn 15: Round braid with three-layer structure 16, 17, 18: Round braid
Claims (1)
維の混繊糸に上記熱可塑性マトリックス繊維と同種の繊
維からなる被覆糸を捲回被覆して被覆混繊糸とし、この
被覆混繊糸を編組して得られた複数本の丸打ち組紐を同
心状に積層し、得られたチューブ状の多重組紐を所望の
金型に投入し加熱、加圧成形して得られたラケットフレ
ームにおいて、上記の混繊糸が非連続の熱可塑性マトリ
ックス繊維および非連続の強化繊維からなる混繊度が３
０％以上の実質的に無撚の混繊糸であり、上記の多重組
紐が２〜５本の丸打ち組紐からなり、上記の被覆混繊糸
における強化繊維の体積含有率が３０〜６５％で、かつ
被覆混繊糸における被覆糸の重量比が１〜１０％であ
り、上記の多重組紐を構成する丸打ち組紐の打ち数が、
最内層で２４打ち以上４８打ち以下、最外層で３６打ち
以上９６打ち以下、中間層で２４打ち以上９６打ち以下
であることを特徴とするラケットフレーム。1. A mixed yarn of a thermoplastic matrix fiber and a reinforcing fiber is wound with a coated yarn made of the same type of fiber as the thermoplastic matrix fiber to form a coated mixed yarn, and the coated mixed yarn is braided. In the racket frame obtained by stacking the plurality of round braids obtained in a concentric manner and putting the obtained tubular multiple braids into a desired mold and heating and pressure molding, The yarn is composed of a discontinuous thermoplastic matrix fiber and a discontinuous reinforcing fiber and has a mixing degree of 3
0% or more of a substantially non-twisted mixed yarn, the multiple braid is composed of 2 to 5 round braids, and the coated mixed yarn has a reinforcing fiber volume content of 30 to 65%. In addition, the weight ratio of the coated yarn in the coated mixed fiber yarn is 1 to 10%, and the number of round braids constituting the above-mentioned multiple braid is
A racket frame characterized in that the innermost layer has 24 or more and 48 or less hits, the outermost layer has 36 or more and 96 or less hits, and the intermediate layer has 24 or more hits and 96 or less hits.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5054854A JPH06238014A (en) | 1993-02-19 | 1993-02-19 | Racket frame |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5054854A JPH06238014A (en) | 1993-02-19 | 1993-02-19 | Racket frame |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH06238014A true JPH06238014A (en) | 1994-08-30 |
Family
ID=12982185
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5054854A Pending JPH06238014A (en) | 1993-02-19 | 1993-02-19 | Racket frame |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH06238014A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2016159340A1 (en) * | 2015-04-03 | 2016-10-06 | 三菱瓦斯化学株式会社 | Composite material, process for producing composite material, and process for producing molded article |
| JP2016196624A (en) * | 2015-04-03 | 2016-11-24 | 国立大学法人岐阜大学 | Composite material, method for producing composite material and method for producing molding |
| US20210187364A1 (en) * | 2019-12-18 | 2021-06-24 | Head Technology Gmbh | Ball game racket frame |
-
1993
- 1993-02-19 JP JP5054854A patent/JPH06238014A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2016159340A1 (en) * | 2015-04-03 | 2016-10-06 | 三菱瓦斯化学株式会社 | Composite material, process for producing composite material, and process for producing molded article |
| JP2016196624A (en) * | 2015-04-03 | 2016-11-24 | 国立大学法人岐阜大学 | Composite material, method for producing composite material and method for producing molding |
| US10926488B2 (en) | 2015-04-03 | 2021-02-23 | Mitsubishi Gas Chemical Company, Inc. | Composite material, method for manufacturing composite material, and method for manufacturing molded article |
| US20210187364A1 (en) * | 2019-12-18 | 2021-06-24 | Head Technology Gmbh | Ball game racket frame |
| US11679308B2 (en) * | 2019-12-18 | 2023-06-20 | Head Technology Gmbh | Ball game racket frame |
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