JPH05228228A - Racket frame and its manufacture - Google Patents

Racket frame and its manufacture

Info

Publication number
JPH05228228A
JPH05228228A JP4087921A JP8792192A JPH05228228A JP H05228228 A JPH05228228 A JP H05228228A JP 4087921 A JP4087921 A JP 4087921A JP 8792192 A JP8792192 A JP 8792192A JP H05228228 A JPH05228228 A JP H05228228A
Authority
JP
Japan
Prior art keywords
core material
racket frame
molding
racket
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.)
Pending
Application number
JP4087921A
Other languages
Japanese (ja)
Inventor
Ryoji Higuchi
良司 樋口
Masahiro Yamashita
雅浩 山下
Teruyuki Sugita
輝之 杉田
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mizuno Corp
Original Assignee
Mizuno Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Mizuno Corp filed Critical Mizuno Corp
Priority to JP4087921A priority Critical patent/JPH05228228A/en
Publication of JPH05228228A publication Critical patent/JPH05228228A/en
Pending legal-status Critical Current

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  • Laminated Bodies (AREA)
  • Casting Or Compression Moulding Of Plastics Or The Like (AREA)

Abstract

PURPOSE:To simplify the manufacturing process, stabilize quality, and reduce the weight by constituting a racket frame with a core material made of a polymethacryl imide hard foam body having the specific gravity of a specific value and an outer shell made of a fiber reinforced synthetic resin. CONSTITUTION:A racket frame is formed with a core material 3 made of a polymethacryl imide hard foam body having the specific gravity of 0.05-0.2 and an outer shell made of a continuous fiber-reinforced resin. The nearly racket-shaped core material 3 is formed with the polymethacryl imide hard foam body having the specific gravity of 0.05-0.2, the core material 3 is coated with a racket frame molding prepreg 10, arranged in a die 11, clamped, heated, pressurized, hardened, and molded. The core material 3 also serves as a strength member, the frame has excellent compression strength and tenacity, the drawing strength of gut is improved, the durability of the racket frame is improved, the outer shell is made thin in thickness, and the racket frame can be made lightweight.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【産業上の利用分野】本発明は、テニス、バドミント
ン、スカッシュ等のラケットフレーム及びその製造方法
に関するものであり、更に詳しくは、中実のラケットフ
レーム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 racket frame for tennis, badminton, squash, etc. and a method for manufacturing the same, and more particularly to a solid racket frame and a method for manufacturing the same.

【0002】[0002]

【従来の技術】テニス・バドミントン・スカッシュ用の
ラケットフレーム(以下ラケットフレームと省略する)
は、その要求される特性の主なものとして通常、強靭
性、剛性及び反発力があげられる。現在では、上記の特
性を満足させしかも必要な形状を得やすいことから、繊
維強化プラスチック(以下FRPと称する。)製のもの
が多く見られるようになった。これらFRP製ラケット
フレームの構成としては、連続繊維などの補強繊維とエ
ポキシ、ポリエステルなどの熱硬化性樹脂をマトリック
スとして成形されたものが多く見られる。そしてその成
形法としては、伸縮自在のチューブを芯材としてその外
周に成形用材料を積層し、成形時に前記チューブを圧縮
空気等で拡開して、内圧により金型に成形用材料を押圧
し成形するいわゆる内圧成形法や、発泡合成樹脂等で略
ラケット形状の芯材を形成し、該ラケットフレーム成形
用の芯材に、補強繊維にマトリックス樹脂を含浸させて
半硬化状態にしたプリプレグを巻きつけて金型に挿入
し、加熱加圧成形するいわゆる外圧成形法が一般的であ
る。
2. Description of the Related Art Racket frame for tennis, badminton and squash (hereinafter abbreviated as racket frame)
The toughness, rigidity, and repulsion force are usually cited as the main properties required for them. Nowadays, many products made of fiber reinforced plastic (hereinafter referred to as FRP) have come to be seen because they satisfy the above-mentioned characteristics and can easily obtain a required shape. As the structure of these FRP racket frames, many are formed by using reinforcing fibers such as continuous fibers and a thermosetting resin such as epoxy or polyester as a matrix. And as the molding method, the expandable tube is used as a core material and the molding material is laminated on the outer periphery thereof, the tube is expanded by compressed air etc. at the time of molding, and the molding material is pressed against the mold by the internal pressure. A so-called internal pressure molding method for molding, or forming a substantially racket-shaped core material with foamed synthetic resin, etc., and winding a prepreg in a semi-cured state by impregnating reinforcing fibers with matrix resin around the core material for molding the racket frame. A so-called external pressure molding method is generally used in which the material is attached, inserted into a mold, and heated and pressed.

【0003】そのほか、最近では、繊維含有率を高めて
軽量化を図り、設計の自由度を向上させしかも製造工程
を簡単にする目的で、溶融可能な金属を略ラケットフレ
ーム形状に形成して芯材とし、該芯材に連続繊維を被覆
して金型に配置後、金型を圧締して、閉じた金型内に架
橋ポリアミノアミド樹脂、架橋エポキシ変性ポリアミノ
アミド樹脂または架橋ポリエステルアミド樹脂を生成し
うる材料を注入し、金型内で反応硬化させて成形するR
IM成形法によるラケットフレーム及びその製造方法も
発明されている。
In addition, recently, for the purpose of increasing the fiber content to reduce the weight, improve the design freedom, and simplify the manufacturing process, the meltable metal is formed into a substantially racket frame shape to form a core. As a material, the core material is coated with continuous fibers and placed in a mold, and then the mold is clamped to form a crosslinked polyaminoamide resin, a crosslinked epoxy-modified polyaminoamide resin or a crosslinked polyesteramide resin in the closed mold. R is formed by injecting a material that can be generated and curing it by reaction curing in a mold
A racket frame by the IM molding method and a method for manufacturing the same are also invented.

【0004】[0004]

【発明が解決しようとする課題】上記成形法の内、中実
の芯材を用いて成形する方法、例えば外圧成形法におい
ては、芯材として、重量を大幅に増加させないために例
えばウレタン発泡合成樹脂、アクリル発泡合成樹脂、ポ
リエチレン発泡合成樹脂などが用いられている。通常ラ
ケットフレーム成形用の樹脂としては、エポキシ樹脂、
ポリエステル樹脂、ナイロン樹脂等が主なものとして挙
げられ、これらの樹脂を用いて成形する場合成形温度が
100℃〜150℃となる。従って、ウレタン発泡合成
樹脂の芯材を用いた場合には、約110℃以上になると
芯材が二次発泡を起こし、芯材の寸法及び硬さが不安定
になる欠点があった。またアクリル発泡合成樹脂、ポリ
エチレン発泡合成樹脂は、100℃を越えると収縮し
て、外殻を金型内で加圧硬化成形する場合に成形圧力が
均等にかかりにくくなる。また、これらの芯材は、圧縮
強度が低く強度メンバーとはなり難いものであった。
Among the above-mentioned molding methods, in the method of molding using a solid core material, for example, in the external pressure molding method, as a core material, in order to prevent the weight from being significantly increased, for example, urethane foam synthesis is used. Resin, acrylic foam synthetic resin, polyethylene foam synthetic resin, etc. are used. Ordinary racket frame molding resin, epoxy resin,
Polyester resins, nylon resins and the like are mainly mentioned, and the molding temperature is 100 ° C. to 150 ° C. when molding is performed using these resins. Therefore, when a core material made of urethane foam synthetic resin is used, there is a drawback that the core material causes secondary foaming at a temperature of about 110 ° C. or higher, and the dimensions and hardness of the core material become unstable. Further, the acrylic foam synthetic resin and the polyethylene foam synthetic resin contract when the temperature exceeds 100 ° C., and it becomes difficult to apply the molding pressure evenly when the outer shell is pressure-cured and molded in the mold. Further, these core materials have low compressive strength and are difficult to be strength members.

【0005】RIM成形法においては、成形温度が12
0℃〜140℃程度、成形圧力は3〜10kg/cm2と高い
ため、一般に使われている発泡性ウレタン樹脂を用いる
と上記温度、圧力に耐えられないため溶融可能な金属を
使用しているのであるが、ラケットフレームを成形後加
熱して、芯材を溶融除去するのにかなりの時間を要して
いた。そのほか、バドミントン用のラケットフレームや
テニス用ラケットフレームのヨーク部など、フレーム径
の小さいものにおいては、中空に形成することが難しか
った。本発明は、上記従来の欠点に鑑み、強度的に優れ
た芯材を用い、軽量でありながら圧縮強度が大きいラケ
ットフレームと、該ラケットフレームを成形する際に、
成形時の熱や圧力に耐えうる芯材を用いて、軽量で品質
の安定したラケットフレームを製造する方法を提供しよ
うとするものである。
In the RIM molding method, the molding temperature is 12
Since the molding pressure is as high as 0 to 140 ° C and the molding pressure is as high as 3 to 10 kg / cm 2 , a meltable metal is used because it cannot withstand the above temperature and pressure when using a commonly used foaming urethane resin. However, it took a considerable time to melt and remove the core material by heating after molding the racket frame. In addition, it has been difficult to form the racket frame for badminton or the yoke part of the racket frame for tennis, which has a small frame diameter, into a hollow shape. In view of the above-mentioned conventional drawbacks, the present invention uses a core material excellent in strength, is a lightweight racket frame having a large compressive strength, and when molding the racket frame,
An object of the present invention is to provide a method for manufacturing a lightweight and stable racket frame using a core material that can withstand heat and pressure during molding.

【0006】[0006]

【課題を解決するための手段】上記目的を達成するため
に、本発明のラケットフレームは、比重が0.05〜
0.2のポリメタクリルイミド硬質発泡体の芯材と、連
続繊維強化樹脂製の外殻とからなることを特徴としてい
る。そして上記ラケットフレームの少なくともヨーク部
にポリメタクリルイミド硬質発泡体の芯材を用いること
により、フレームの径が小さく中空に成形でき難いが強
度が要求される部分を軽量に成形できる。
In order to achieve the above object, the racket frame of the present invention has a specific gravity of 0.05 to
It is characterized by comprising a core material of 0.2 polymethacrylimide hard foam and an outer shell made of continuous fiber reinforced resin. By using a core material of a polymethacrylimide hard foam for at least the yoke portion of the racket frame, it is possible to mold a portion having a small frame diameter, which is difficult to be formed into a hollow, but which is required to have a light weight, in a lightweight manner.

【0007】またその製造方法としては、ポリメタクリ
ルイミド硬質発泡体の芯材と繊維強化樹脂製の外殻とか
ら成るラケットフレームの製造方法であって、第1の方
法は、ポリメタクリルイミド硬質発泡体で略ラケットフ
レーム形状の芯材を形成し、該芯材にフレーム成形用の
プリプレグを被覆巻回し、それを成形用の金型に配置
し、金型を圧締後、加熱加圧して成形する方法である。
第2の方法としては、ポリメタクリルイミド硬質発泡体
で略ラケットフレーム形状の芯材を形成し、該芯材に連
続繊維を被覆巻回して成形体とし、該成形体をラケット
フレーム成形用の金型内に配置し、該金型を圧締後閉じ
た金型内に、成形用樹脂材料を注入し、金型内で反応硬
化させることによりラケットフレームを成形するRIM
(リアクション・インジェクション・モールディング)
法あるいはRTM(レジン・トランスファー・モールデ
ィング)法である。
The manufacturing method thereof is a method of manufacturing a racket frame comprising a core material of a polymethacrylimide hard foam and an outer shell made of a fiber reinforced resin. The first method is a polymethacrylimide hard foam. A racket frame-shaped core material is formed by a body, a frame forming prepreg is wrapped around the core material, the core material is placed in a molding die, and the mold is clamped, and then heated and pressed to mold. Is the way to do it.
A second method is to form a substantially racket frame-shaped core material from a polymethacrylimide rigid foam, coat continuous fibers around the core material to form a molded body, and mold the molded body to a racket frame molding metal. A RIM for forming a racket frame by placing a molding resin material in a mold which is placed in a mold and closed after the mold is clamped, and is cured by reaction in the mold.
(Reaction injection molding)
Method or RTM (resin transfer molding) method.

【0008】本発明に用いられるポリメタクリルイミド
硬質発泡体の芯材は、比重が、0.05以下であると金
型で成形する際に、成形用樹脂が浸透したり、成形圧力
でつぶれて好ましくなく、0.2以上であるとフレーム
形状に曲げにくいため、成形体をラケットフレーム成形
用金型に配置する際の作業性が良くないほか重量が重く
なるため好ましくない。本発明に用いられる補強繊維と
して、通常のFRP成形品に使用される繊維、例えばガ
ラス繊維、炭素繊維等の無機繊維、アラミド繊維、高張
力ポリエチレン繊維などの有機繊維を用いることが出来
る。成形用樹脂としては、通常のFRP成形品の成形に
用いられる樹脂はいかなるものでもよいが、例えばエポ
キシ樹脂、ポリエステル樹脂のほか、架橋ポリアミノア
ミド樹脂、架橋エポキシ変性ポリアミノアミド樹脂、架
橋ポリエステルアミド樹脂を用いることが出来る。
The core material of the polymethacrylimide hard foam used in the present invention has a specific gravity of 0.05 or less, and when it is molded by a mold, the molding resin permeates or is crushed by molding pressure. If it is 0.2 or more, it is difficult to bend into a frame shape, so that workability when arranging the molded body in the racket frame molding die is poor and the weight becomes heavy, which is not preferable. As the reinforcing fibers used in the present invention, fibers used in ordinary FRP molded articles, for example, inorganic fibers such as glass fibers and carbon fibers, organic fibers such as aramid fibers and high-strength polyethylene fibers can be used. As the molding resin, any resin used for molding an ordinary FRP molded article may be used, and examples thereof include a crosslinked polyaminoamide resin, a crosslinked epoxy-modified polyaminoamide resin, and a crosslinked polyesteramide resin in addition to an epoxy resin and a polyester resin. Can be used.

【0009】[0009]

【作用】本発明のラケットフレームは、芯材に圧縮強度
が大きいポリメタクリルイミド硬質発泡体を用いたた
め、芯材を強度メンバーとする事が出来るので、フレー
ムの圧縮強度が向上する。本発明の製造方法によれば、
芯材としてポリメタクリルイミド硬質発泡体を用いた方
法であるから、耐熱温度が150〜200℃程度と高い
ため、成形用樹脂の選択範囲が拡大され、補強繊維との
濡れ性など、その繊維に適し、しかも強靭な成形用樹脂
の最適な組み合わせを選ぶことが出来る。また、従来の
ように成形時の熱や圧力で芯体が変形したり、成形用樹
脂が芯材に含浸することがなくなり、外殻を均一に成形
出来品質の安定したラケットフレームを製造出来る。
In the racket frame of the present invention, since the polymethacrylimide hard foam having a large compressive strength is used as the core material, the core material can be used as a strength member, so that the compressive strength of the frame is improved. According to the manufacturing method of the present invention,
Since it is a method using a polymethacrylimide hard foam as the core material, the heat resistant temperature is as high as about 150 to 200 ° C., so that the selection range of the molding resin is expanded, and the wettability with the reinforcing fiber, etc. You can select the most suitable and strong combination of molding resins. Further, unlike the conventional case, the core body is not deformed by heat or pressure during molding and the core material is not impregnated with the core material, so that the outer shell can be uniformly molded and a racket frame with stable quality can be manufactured.

【0010】従来は、成形時の温度が高く、従来の発泡
合成樹脂製の芯材を用いることが出来ない場合には、芯
材として成形後除去できる溶融金属を用いていたが、本
発明に用いるポリメタクリルイミド硬質発泡体の芯材
は、従来の溶融金属の芯材に比べ軽いので、成形時に芯
材の重みでラケットフレームの肉厚に偏りを生じるとい
った恐れがなく、取り扱いが容易で成形後の芯材の除去
作業も要らず、作業性が向上する。
Conventionally, when the temperature during molding is high and the conventional core material made of foamed synthetic resin cannot be used, a molten metal which can be removed after molding is used as the core material. Since the core material of the polymethacrylimide hard foam used is lighter than the conventional core material of molten metal, there is no fear that the weight of the core material will cause uneven thickness of the racket frame at the time of molding, and it is easy to handle. The workability is improved because the subsequent work of removing the core material is not required.

【0011】[0011]

【実施例】【Example】

(実施例1)以下、本発明をテニス用のラケットフレー
ム及びその製造方法について説明する。図1は本発明の
方法によって得られたラケットフレーム1の正面図、図
2はそのA−A’線切断端面図、図3はラケットフレー
ム1を製造するにあたっての第1の方法で芯材3にプリ
プレグ10を巻回した状態の説明図である。打球部6、
シャフト7、グリップ8よりなるラケットフレーム1
は、その外殻2を繊維強化合成樹脂で形成されている。
そしてその内側には、ポリメタクリルイミド硬質発泡体
を芯材3として用いている。
(Embodiment 1) A racket frame for tennis and a method of manufacturing the same according to the present invention will be described below. FIG. 1 is a front view of a racket frame 1 obtained by the method of the present invention, FIG. 2 is a sectional view taken along line AA ′ of FIG. 3, and FIG. 3 is a core material 3 according to a first method for manufacturing the racket frame 1. It is explanatory drawing of the state which wound the prepreg 10 in it. Ball hitting part 6,
Racket frame 1 consisting of shaft 7 and grip 8
The outer shell 2 is formed of fiber reinforced synthetic resin.
And, a polymethacrylimide hard foam is used as the core material 3 inside thereof.

【0012】ラケットフレーム1を成形する実施例1の
方法としては、まず独立気泡体構造を有し、比重が0.
05〜0.11のポリメタクリルイミド硬質発泡体を打
球部6、シャフト7、グリップ8に相当する長さに切断
形成して芯材3とし、該芯材3の外周面に炭素繊維のブ
レードにエポキシ樹脂を含浸させて形成したプリプレグ
10を被覆する。それを成形用の金型内に配置し、型締
め後加圧し130℃程度で30分間加熱して成形した。
上記方法においては、芯材にプリプレグを直接被覆巻回
したが、芯材に補強繊維を被覆巻回した後、成形用樹脂
であるエポキシ樹脂を含浸させ半硬化させたものを金型
内に配置し加圧加熱成形することもできる。また、少な
くともフレーム径の小さいヨーク部分をポリメタクリル
イミド硬質発泡体で成形すれば、ヨーク部分が軽量なラ
ケットフレームとなり、その他の部分を中空としてバラ
ンス調整をするなど設計の自由度が大きくなる。また効
率よく成形できる。
As a method of Example 1 for molding the racket frame 1, first, the racket frame 1 has a closed cell structure and a specific gravity of 0.
A core material 3 is formed by cutting a polymethacrylimide hard foam of 05 to 0.11 into a length corresponding to the ball striking portion 6, the shaft 7 and the grip 8, and a carbon fiber blade is formed on the outer peripheral surface of the core material 3. A prepreg 10 formed by impregnating an epoxy resin is coated. It was placed in a mold for molding, clamped after pressing, and heated at about 130 ° C. for 30 minutes to mold.
In the above method, the core material was directly coated and wound with a prepreg, but after the core material was coated and wound with a reinforcing fiber, the epoxy resin as a molding resin was impregnated and semi-cured, and then placed in a mold. It is also possible to perform pressure heating molding. Further, if at least the yoke portion having a small frame diameter is molded from polymethacrylimide hard foam, the yoke portion becomes a lightweight racket frame, and the other portions are made hollow to adjust the balance, thereby increasing the degree of freedom in design. Also, it can be molded efficiently.

【0013】(実施例2)本発明のラケットフレーム1
を製造するについての第2の方法として、芯材は、実施
例1と同様のものを用いた。図4は成形体4の説明図、
図5は製造工程の説明図である。即ち、ラケットフレー
ム1を成形するには、まず独立気泡体構造を有し、比重
が0.05〜0.1のポリメタクリルイミド硬質発泡体
で略ラケット形状の芯材3を形成し、図4に示すように
該芯材3の外周面に補強繊維5としてカ−ボン繊維のブ
レードを、繊維含有率が50〜60重量%となる様に被
覆してフレーム成形体4とした。又、ポリメタクリルイ
ミド硬質発泡体でヨーク部成形用芯材を形成し、カーボ
ン繊維のマット、あるいはブレードを添設してヨーク部
成形体9とした。そしてフレーム成形体4とヨーク部成
形体9を図示はしなかったがラケットフレーム成形用の
金型内に配置し、金型11を圧締後、図5に示すように
閉じた金型11内に架橋エポキシ変性ポリアミノアミド
樹脂を生成しうる材料を注入し、成形温度120℃〜1
50℃、成形圧力1〜10kg/cm2で反応硬化成形した。
本実施例においては、テニス用ラケットフレームについ
て説明したが、バドミントン用ラケットフレームを本実
施例の方法で成形しても同様の効果が得られる。
(Embodiment 2) Racket frame 1 of the present invention
As the second method for manufacturing, the same core material as in Example 1 was used. FIG. 4 is an explanatory view of the molded body 4,
FIG. 5 is an explanatory diagram of the manufacturing process. That is, in order to mold the racket frame 1, first, a substantially racket-shaped core material 3 having a closed cell structure and made of a polymethacrylimide hard foam having a specific gravity of 0.05 to 0.1 is formed. As shown in (1), the outer peripheral surface of the core material 3 was coated with a blade of carbon fiber as the reinforcing fiber 5 so that the fiber content was 50 to 60% by weight to obtain a frame molded body 4. Further, a yoke portion molding core material was formed from a polymethacrylimide hard foam, and a mat of carbon fibers or a blade was additionally provided to obtain a yoke portion molding body 9. Although not shown, the frame molded body 4 and the yoke portion molded body 9 are placed in a racket frame molding die, and after the die 11 is clamped, the mold 11 closed as shown in FIG. A material capable of forming a crosslinked epoxy-modified polyaminoamide resin is injected into the mixture, and the molding temperature is 120 ° C to 1 ° C.
Reaction curing molding was performed at 50 ° C. and a molding pressure of 1 to 10 kg / cm 2 .
Although the racket frame for tennis has been described in this embodiment, the same effect can be obtained by molding the racket frame for badminton by the method of this embodiment.

【0014】[0014]

【発明の効果】以上の様に本発明のラケットフレーム
は、ポリメタクリルイミド硬質発泡体を芯材としたこと
から、芯材が従来のように成形の際の単なる保形効果の
みではなく、強度メンバーとしても作用することから、
フレームの圧縮強度及び靭性に優れ、ガットの引き抜き
強度も向上するため、ラケットフレームの耐久性が向上
し、外殻の厚みを薄くして軽量化が図れる。また、本発
明のラケットフレームを成形するにあたっては、比重が
0.05〜0.2のポリメタクリルイミド硬質発泡体を
芯材としたことから、該芯材は耐熱温度が150℃〜2
00℃と高く、圧縮強さはポリ塩化ビニルに較べ50%
(20℃、密度0.8g/cm3 )程度優れているため、外
圧成形法、RIM成形法又はRTM成形法により成形す
る場合には、前記成形法の温度、圧力に対しても変形し
たり、軟化して成形用樹脂が含浸することがないため、
ラケットフレームの外殻の厚みが均一に成形出来、芯材
は強度メンバーとしても作用するため、外殻の厚みを薄
くして軽量化を図ることが出来るなど設計の自由度が向
上する。
As described above, since the racket frame of the present invention uses the polymethacrylimide hard foam as the core material, the core material has not only the shape-retaining effect at the time of molding as in the conventional case but also the strength. Since it also acts as a member,
Since the frame has excellent compressive strength and toughness, and the pullout strength of the gut is also improved, the durability of the racket frame is improved, and the outer shell can be made thinner and lighter. Further, in molding the racket frame of the present invention, since the polymethacrylimide hard foam having a specific gravity of 0.05 to 0.2 was used as the core material, the core material has a heat resistant temperature of 150 ° C to 2 ° C.
As high as 00 ℃, compressive strength is 50% compared to polyvinyl chloride
(20 ° C., density 0.8 g / cm 3 ) It is excellent, so when it is molded by the external pressure molding method, RIM molding method or RTM molding method, it may be deformed against the temperature and pressure of the molding method. , Because it is not softened and impregnated with the molding resin,
The outer shell of the racket frame can be molded to have a uniform thickness, and the core material also acts as a strength member, so that the outer shell can be made thinner and lighter in weight, which improves design freedom.

【0015】また、例えば架橋ポリアミノアミド樹脂、
架橋エポキシ変性ポリアミノアミド樹脂または架橋ポリ
エステルアミド樹脂を生成しうる材料を注入してRIM
成形法やRTM成形法で成形する場合には、該芯材は軽
量であることから補強繊維を被覆し金型に配置しても、
芯材の重みで外殻の厚みが偏ることがなく、品質の安定
したラケットフレームが成形出来るほか、軽量であるた
め芯材を除去する必要もなく、したがって、従来の溶融
金属製の芯材を使用した場合の様に、ラケットフレーム
成形後の芯材除去工程も必要としないなど工程も簡単
で、作業性も向上する。特にテニス用のラケットフレー
ムのフレーム径の細いヨーク部分や、バドミントン用の
ラケットフレームの打球部の成形においては、より効果
的である。
Further, for example, a crosslinked polyaminoamide resin,
RIM by injecting material capable of forming crosslinked epoxy modified polyaminoamide resin or crosslinked polyesteramide resin
When molding by the molding method or the RTM molding method, since the core material is lightweight, even if it is arranged with a reinforcing fiber on the mold,
The weight of the core material does not cause the thickness of the outer shell to be uneven, and a racket frame with stable quality can be molded.Because it is lightweight, it is not necessary to remove the core material. Therefore, the conventional molten metal core material can be used. Unlike the case of using the racket frame, the process of removing the core material after molding the racket frame is not necessary and the workability is improved. Particularly, it is more effective in forming a yoke portion having a small frame diameter of a racket frame for tennis and a hitting portion of a racket frame for badminton.

【図面の簡単な説明】[Brief description of drawings]

【図1】本発明によるラケットフレームの正面図。FIG. 1 is a front view of a racket frame according to the present invention.

【図2】図1のA−A’線切断端面図。FIG. 2 is a sectional end view taken along the line A-A ′ of FIG.

【図3】実施例1の方法の説明図。FIG. 3 is an explanatory diagram of a method according to the first embodiment.

【図4】実施例1の成形体の説明図。FIG. 4 is an explanatory view of a molded body of Example 1.

【図5】RIM、RTM成形法の製造工程の説明図。FIG. 5 is an explanatory diagram of a manufacturing process of RIM and RTM molding methods.

【符号の説明】[Explanation of symbols]

1 ラケットフレーム 2 外殻 3 芯材 4 成形体 5 補強繊維 6 打球部 7 シャフト 8 グリップ 9 ヨーク部成形体 10 プリプレグ 11 金型 1 Racket Frame 2 Outer Shell 3 Core Material 4 Molded Body 5 Reinforcing Fiber 6 Hitting Ball 7 Shaft 8 Grip 9 Yoke Molded Body 10 Prepreg 11 Mold

Claims (4)

【特許請求の範囲】[Claims] 【請求項1】 比重が0.05〜0.2のポリメタクリ
ルイミド硬質発泡体の芯材と、連続繊維強化樹脂製の外
殻とからなることを特徴とするラケットフレーム。
1. A racket frame comprising a core material of a polymethacrylimide hard foam having a specific gravity of 0.05 to 0.2 and an outer shell made of continuous fiber reinforced resin.
【請求項2】 前記ラケットフレームの少なくともヨー
ク部にポリメタクリルイミド硬質発泡体の芯材を内蔵し
たことを特徴とする請求項1記載のラケットフレーム。
2. The racket frame according to claim 1, wherein a core material of a polymethacrylimide hard foam is built in at least a yoke portion of the racket frame.
【請求項3】 比重が0.05〜0.2のポリメタクリ
ルイミド硬質発泡体で略ラケット形状の芯材を形成し、
該芯材をラケットフレーム成形用のプリプレグで被覆し
て金型内に配置し、型締め後加熱加圧して硬化成形した
ことを特徴とするラケットフレームの製造方法。
3. A substantially racket-shaped core material is formed from a polymethacrylimide hard foam having a specific gravity of 0.05 to 0.2,
A method for manufacturing a racket frame, characterized in that the core material is covered with a prepreg for molding a racket frame, the core material is placed in a mold, and after the mold is clamped, it is heated and pressed to cure and mold.
【請求項4】 比重が0.05〜0.2のポリメタクリ
ルイミド硬質発泡体で略ラケット形状の芯材を形成し、
該芯材を連続繊維よりなる補強繊維で被覆して成形体と
し、該成形体を型入れ後閉じた金型内に、成形用樹脂材
料を注入し、RIM成形法又はRTM成形法により成形
したことを特徴とするラケットフレームの製造方法。
4. A substantially racket-shaped core material is formed from a polymethacrylimide hard foam having a specific gravity of 0.05 to 0.2,
The core material is covered with a reinforcing fiber made of continuous fibers to obtain a molded body, and the molded resin material is poured into a closed mold after the mold is put into the mold and molded by the RIM molding method or the RTM molding method. A method for manufacturing a racket frame, comprising:
JP4087921A 1991-12-26 1992-03-11 Racket frame and its manufacture Pending JPH05228228A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP4087921A JPH05228228A (en) 1991-12-26 1992-03-11 Racket frame and its manufacture

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP3-359929 1991-12-26
JP35992991 1991-12-26
JP4087921A JPH05228228A (en) 1991-12-26 1992-03-11 Racket frame and its manufacture

Publications (1)

Publication Number Publication Date
JPH05228228A true JPH05228228A (en) 1993-09-07

Family

ID=26429148

Family Applications (1)

Application Number Title Priority Date Filing Date
JP4087921A Pending JPH05228228A (en) 1991-12-26 1992-03-11 Racket frame and its manufacture

Country Status (1)

Country Link
JP (1) JPH05228228A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006340865A (en) * 2005-06-08 2006-12-21 Sri Sports Ltd Tennis racket frame
CN110694241A (en) * 2019-09-18 2020-01-17 陈兆俊 Method for manufacturing frame of stringing racket

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59156724A (en) * 1983-02-12 1984-09-06 レ−ム・ゲゼルシヤフト・ミツト・ベシユレンクテル・ハフツング Manufacture of joining material

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59156724A (en) * 1983-02-12 1984-09-06 レ−ム・ゲゼルシヤフト・ミツト・ベシユレンクテル・ハフツング Manufacture of joining material

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006340865A (en) * 2005-06-08 2006-12-21 Sri Sports Ltd Tennis racket frame
CN110694241A (en) * 2019-09-18 2020-01-17 陈兆俊 Method for manufacturing frame of stringing racket

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