JPH08244054A - Housing and production thereof - Google Patents
Housing and production thereofInfo
- Publication number
- JPH08244054A JPH08244054A JP7052714A JP5271495A JPH08244054A JP H08244054 A JPH08244054 A JP H08244054A JP 7052714 A JP7052714 A JP 7052714A JP 5271495 A JP5271495 A JP 5271495A JP H08244054 A JPH08244054 A JP H08244054A
- Authority
- JP
- Japan
- Prior art keywords
- housing
- carbon fibers
- range
- sheet material
- short carbon
- 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
- Casings For Electric Apparatus (AREA)
- Laminated Bodies (AREA)
- Casting Or Compression Moulding Of Plastics Or The Like (AREA)
- Moulding By Coating Moulds (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】この発明は、パーソナルコンピュ
ータ、ワードプロセッサ等の各種事務機器や、テレビジ
ョンその他の家庭用電子機器など、各種電子・電気機器
用として好適な筐体と、そのような筐体を製造する方法
に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a housing suitable for various office equipment such as personal computers and word processors, and various electronic and electric devices such as televisions and other household electronic devices, and such a housing. To a method of manufacturing.
【０００２】[0002]
【従来の技術】たとえば、特公平５−５８３７１号公報
には、繊維長が１０〜１００mmの炭素短繊維と熱硬化性
樹脂との複合体（ＣＦＲＰ：Carbon Fiber Reinforced
Plastics）からなる成形品が記載されている。このＣＦ
ＲＰ成形品は、筐体としての利用が考えられるが、以下
において説明するような不都合がある。2. Description of the Related Art For example, Japanese Patent Publication No. 5-58371 discloses a composite of short carbon fibers having a fiber length of 10 to 100 mm and a thermosetting resin (CFRP: Carbon Fiber Reinforced).
Molded articles made of plastics) are described. This CF
The RP molded product may be used as a housing, but has the disadvantages described below.
【０００３】すなわち、上述したＣＦＲＰ成形品は、所
望の成形品の形状のキャビティを有する金型内で炭素短
繊維を含む熱硬化性樹脂を硬化させることによって成形
するが、熱硬化性樹脂の硬化には少なくとも３分以上、
通常は１０分以上かかり、成形サイクルが長いために製
造コストが高くなるばかりか、マトリクスが熱硬化性樹
脂であるために成形品のリサイクル使用が難しい。That is, the CFRP molded article described above is molded by curing a thermosetting resin containing short carbon fibers in a mold having a cavity having the shape of the desired molded article. For at least 3 minutes,
It usually takes 10 minutes or more, and the manufacturing cycle is long, so that the manufacturing cost is high, and it is difficult to recycle the molded product because the matrix is a thermosetting resin.
【０００４】そこで、筐体には、成形が容易な熱可塑性
樹脂、たとえばポリカーボネートやＡＢＳ、ナイロンを
マトリクスとするＣＦＲＴＰ（Carbon Fiber Reinforce
d Thermoplastics）成形品が多く使われている。このよ
うなＣＦＲＴＰ成形品は、長さが、たとえば２０mmとい
った長い炭素短繊維と上記熱可塑性樹脂との混練物を射
出成形することによって作るが、混練時や、混練物が射
出成形機のシリンダやゲートを通過するときに炭素短繊
維が０．１〜１mmほどに短く折れてしまうので、薄肉、
軽量で、しかも強度や剛性に優れた筐体を得るのは難し
い。また、炭素短繊維が短く折れると、筐体に不可欠な
電磁シールド特性も低下してくる。電磁シールド特性の
低下を補うために、表面に金属メッキを施すこともある
が、そうすると、やはり製造コストが高くなる。Therefore, a CFRTP (Carbon Fiber Reinforce) having a matrix of a thermoplastic resin which is easily molded, for example, polycarbonate, ABS, or nylon is used for the housing.
d Thermoplastics) Molded products are often used. Such a CFRTP molded product is produced by injection-molding a kneaded product of a short carbon fiber having a length of, for example, 20 mm and the above-mentioned thermoplastic resin. During kneading, the kneaded product is a cylinder of an injection molding machine or When passing through the gate, the short carbon fibers will break as short as 0.1 to 1 mm.
It is difficult to obtain a case that is lightweight and has excellent strength and rigidity. Further, when the short carbon fibers are broken shortly, the electromagnetic shield characteristics, which are indispensable for the housing, are deteriorated. In order to compensate for the deterioration of the electromagnetic shield characteristics, metal plating may be applied to the surface, but this also increases the manufacturing cost.
【０００５】一方、ＣＦＲＴＰ成形品を製造する別の方
法として、長さが１００mm前後の長い炭素短繊維と、熱
可塑性樹脂、たとえばポリカーボネート、ＡＢＳ、ナイ
ロンとの複合シート材料を所望の形状のキャビティを有
する金型に入れて加圧、加熱して成形するスタンピング
成形法がある。この方法によれば、射出成形法によると
きのような炭素短繊維の折損がほとんど起こらないうえ
に成形サイクルも短くてすむので、薄肉、軽量で、強度
や剛性、電磁シールド特性等に優れていることが要求さ
れる筐体の製造法として大変好適であるように思える。
しかしながら、この方法で筐体として必要な不燃性レベ
ル（たとえば、ＵＬ規格にいうＶ−０レベル）を達成し
ようとすると、材料中に水酸化アルミニウム、三酸化ア
ンチモン、臭素化合物等の難燃剤を多量に配合しなけれ
ばならず、その難燃剤の配合によってキャビティ内にお
ける材料の流動性が大きく低下するので、強度、剛性等
の物性の均一性、厚みその他の形状の均一性、表面の均
一性等に優れた筐体を得るのは容易なことではない。On the other hand, as another method for producing a CFRTP molded product, a composite sheet material of a short carbon fiber having a length of about 100 mm and a thermoplastic resin such as polycarbonate, ABS or nylon is formed into a cavity having a desired shape. There is a stamping molding method in which the material is placed in a mold and pressurized and heated to be molded. According to this method, the short carbon fiber hardly breaks as in the injection molding method and the molding cycle can be shortened. Therefore, it is thin and lightweight, and has excellent strength, rigidity, electromagnetic shielding characteristics, etc. It seems that it is very suitable as a manufacturing method of the case that is required.
However, if an attempt is made to achieve the level of non-combustibility required for the casing by this method (for example, V-0 level in UL standard), a large amount of flame retardant such as aluminum hydroxide, antimony trioxide, and bromine compound is contained in the material. Since the fluidity of the material in the cavity is greatly reduced by blending the flame retardant, the uniformity of physical properties such as strength and rigidity, the uniformity of thickness and other shapes, the uniformity of the surface, etc. It is not easy to get a good housing.
【０００６】すなわち、ＵＬ規格にいうＶ−０レベルと
は、幅が１２．７mm、長さが１２７mmで、厚みが成形品
と同じ厚みの試験片を垂直にセットし、下端に炎を１０
秒間あてて燃焼させたとき、炎を取り去った後１０秒以
内に自己消火し、かつ、燃焼時間の合計が５０秒以内で
なければならないというものであり、５枚の試験片につ
いてそれぞれ２回ずつの測定をしたときにいずれの試験
片においてもかかる条件が満たされなければならないと
いうものであるが、射出成形品のように炭素短繊維が大
変短い場合には、溶融した熱可塑性樹脂が炭素短繊維と
ともに容易に落下するのに対し、スタンピング成形品の
ように炭素短繊維が長い場合には、熱可塑性樹脂が溶融
してもかかる落下がなかなか起こらず、延焼が進んでし
まう。この延焼をくい止めるために多量の難燃剤の配合
が必要になるが、この難燃剤のためにキャビティ内にお
ける材料の流動性が大きく低下し、強度、剛性等の物性
の均一性、厚みその他の形状の均一性、表面の均一性等
が低下してくるのである。難燃剤の大量使用は、もちろ
ん、製造コストをも上昇させる。That is, the V-0 level referred to in the UL standard is that a test piece having a width of 12.7 mm, a length of 127 mm and a thickness of the same as the molded product is set vertically, and a flame is applied to the lower end of 10
When burned by applying for 2 seconds, it must be self-extinguishing within 10 seconds after removing the flame, and the total burning time must be within 50 seconds. For each of 5 test pieces, 2 times each This requirement must be satisfied for all test pieces when the measurement is made.However, when the short carbon fibers are very short as in injection molded products, the molten thermoplastic resin is While the carbon fibers easily fall together with the fibers, when the short carbon fibers are long as in a stamping molded product, even if the thermoplastic resin is melted, the falling does not occur easily and the fire spreads. A large amount of flame retardant must be blended to prevent the spread of fire, but this flame retardant greatly reduces the fluidity of the material in the cavity, and the uniformity of physical properties such as strength and rigidity, thickness and other shapes. Uniformity, surface uniformity, etc. will decrease. The large use of flame retardants, of course, also raises the manufacturing cost.
【０００７】[0007]
【発明が解決しようとする課題】この発明の目的は、従
来の筐体の上述した問題点を解決し、厚みが薄くても強
度や剛性、電磁シールド特性に優れ、しかも、不燃性に
優れた筐体を提供するにある。SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems of conventional casings and to provide excellent strength, rigidity and electromagnetic shield characteristics even when the thickness is thin, and also excellent in nonflammability. To provide the housing.
【０００８】また、この発明の他の目的は、そのような
筐体を低コストで製造する方法を提供するにある。Another object of the present invention is to provide a method for manufacturing such a housing at low cost.
【０００９】[0009]
【課題を解決するための手段】上記目的を達成するため
に、この発明は、板面と平行な面内においてランダムな
方向に配向された炭素短繊維とポリフェニレンスルフィ
ド（ＰＰＳ）とを含む複合体からなる筐体を提供する。
炭素短繊維の平均繊維長が３〜１００mmの範囲にあり、
かつ、含有率が１５〜６０体積％の範囲にあるのが好ま
しい。また、板の曲げ強度は１２kgf/mm2 以上で、曲げ
弾性率が８００kgf/mm2 以上であるのが好ましい。さら
に、板厚みは１．５mm以下であるのが好ましく、電磁波
減衰率は３０dB以上であるのが好ましい。In order to achieve the above object, the present invention provides a composite containing short carbon fibers and polyphenylene sulfide (PPS) oriented in random directions in a plane parallel to the plate surface. To provide a housing consisting of.
The average fiber length of short carbon fibers is in the range of 3 to 100 mm,
In addition, the content is preferably in the range of 15 to 60% by volume. The plate preferably has a bending strength of 12 kgf / mm 2 or more and a bending elastic modulus of 800 kgf / mm 2 or more. Further, the plate thickness is preferably 1.5 mm or less, and the electromagnetic wave attenuation factor is preferably 30 dB or more.
【００１０】この発明は、また、シート面と平行な面内
においてランダムな方向に配向された炭素短繊維とポリ
フェニレンスルフィドとを含む複合シート材料を所望の
筐体の形状のキャビティを有する型に入れ、加圧、加熱
して成形することを特徴とする、筐体の製造方法を提供
する。複合シート材料を、２９０〜３５０℃の範囲の温
度に予熱した後、１３０〜２４５℃の範囲の温度に設定
された型に入れ、加圧、加熱して成形するのも好まし
い。複合シート材料を２５０〜２９０℃の範囲の温度に
設定された型に入れ、加圧、加熱して成形した後、型の
温度を１３０〜２４５℃の範囲に下げてから脱型するの
もよい。複合シート材料の加圧、加熱は、５０〜１，０
００kgf/cm2 の圧力下に５〜１２０秒間行うのが好まし
い。The present invention also puts a composite sheet material containing short carbon fibers and polyphenylene sulfide, which are oriented in random directions in a plane parallel to the sheet surface, into a mold having a cavity having a desired housing shape. The present invention provides a method for manufacturing a housing, which comprises molding by pressurizing and heating. It is also preferable that the composite sheet material is preheated to a temperature in the range of 290 to 350 ° C., then placed in a mold set to a temperature in the range of 130 to 245 ° C., and pressed and heated to be molded. The composite sheet material may be placed in a mold set to a temperature in the range of 250 to 290 ° C., pressurized and heated to be molded, and then the temperature of the mold may be lowered to the range of 130 to 245 ° C. before demolding. . Pressurization and heating of the composite sheet material are 50 to 1,0
It is preferable to perform the treatment under a pressure of 00 kgf / cm 2 for 5 to 120 seconds.
【００１１】この発明をさらに詳細に説明するに、炭素
短繊維は、好ましくは引張強度が２００kgf/mm2 以上
で、引張弾性率が１５，０００kgf/mm2 以上である高強
度、高弾性率炭素繊維からなるものであるのが好まし
い。また、好ましくは、平均繊維長が３〜１００mmの範
囲にあるものを使用する。３mm未満では、板、ひいては
筐体の強度や剛性が不足することがある。また、電磁シ
ールド特性も低くなる。一方、１００mmを超えると、成
形時における複合シート材料の流動性が悪くなって炭素
短繊維の分布にむらができたり、材料が異常に流れて筐
体の表面品位が損なわれたりすることがある。炭素短繊
維の分布にむらができると、強度や剛性も低くなるし、
電磁シールド特性も低くなる。[0011] To explain this invention in more detail, the short carbon fibers, preferably a tensile strength of 200 kgf / mm 2 or more, high strength tensile elastic modulus is 15,000kgf / mm 2 or more, high modulus carbon It is preferably composed of fibers. Further, preferably, those having an average fiber length in the range of 3 to 100 mm are used. If it is less than 3 mm, the strength and rigidity of the plate and eventually the housing may be insufficient. In addition, the electromagnetic shield characteristic is also reduced. On the other hand, when it exceeds 100 mm, the fluidity of the composite sheet material at the time of molding may be deteriorated and the distribution of short carbon fibers may be uneven, or the material may flow abnormally and the surface quality of the housing may be impaired. . If the distribution of short carbon fibers becomes uneven, the strength and rigidity will also decrease,
The electromagnetic shield characteristics are also reduced.
【００１２】炭素短繊維は、複合体中に１５〜６０体積
％の範囲で含まれているのが好ましい。１５体積％より
も低いと、板、ひいては筐体の強度や剛性が不足するこ
とがある。また、電磁シールド特性も低くなる。６０体
積％を超えると、成形時における複合シート材料の流動
性が悪くなって炭素短繊維の分布にむらができ、やはり
強度や剛性、電磁シールド特性が低くなる。なお、炭素
短繊維は、１本１本の繊維（単繊維）に解繊されていて
もよいし、チョップドストランドであってもよい。The short carbon fibers are preferably contained in the composite in an amount of 15 to 60% by volume. If it is lower than 15% by volume, the strength of the plate, and eventually the housing, may become insufficient. In addition, the electromagnetic shield characteristic is also reduced. When it exceeds 60% by volume, the fluidity of the composite sheet material at the time of molding is deteriorated and the distribution of short carbon fibers is uneven, and the strength, rigidity and electromagnetic shield properties are also deteriorated. The short carbon fibers may be defibrated into individual fibers (single fibers) or chopped strands.
【００１３】上記炭素短繊維と複合されるマトリクス樹
脂としては、ＰＰＳを用いる。ＰＰＳは、数ある熱可塑
性樹脂の中でも極めて優れた不燃性を有し、水酸化アル
ミニウム、三酸化アンチモン、臭素化合物等の難燃剤を
配合しなくてもＵＬ規格におけるＶ−０レベルを容易に
達成できるようになり、筐体の不燃性が向上する。ま
た、粘度を数百ポイズと低くできるので、平均繊維長が
３〜１００mmの炭素短繊維と複合しても、難燃剤の使用
が不要であることと相まって後述するスタンピング成形
時における複合シート材料の流動性が向上し、厚みが
０．５〜１．５mmと薄くても強度や剛性、電磁シールド
特性に優れた筐体を得ることができるようになる。な
お、厚みが０．５mm未満では剛性が不足しがちになり、
１．５mmを超えると重量が増大するようになる。PPS is used as the matrix resin to be composited with the short carbon fibers. PPS has extremely excellent nonflammability among many thermoplastic resins, and easily achieves the V-0 level in the UL standard without adding a flame retardant such as aluminum hydroxide, antimony trioxide, or a bromine compound. This makes it possible to improve the incombustibility of the housing. Further, since the viscosity can be lowered to several hundred poises, even if it is compounded with short carbon fibers having an average fiber length of 3 to 100 mm, the use of a flame retardant is not necessary, and the composite sheet material at the time of stamping molding described later is The fluidity is improved, and even if the thickness is as thin as 0.5 to 1.5 mm, it is possible to obtain a housing excellent in strength, rigidity, and electromagnetic shielding characteristics. If the thickness is less than 0.5 mm, the rigidity tends to be insufficient,
If it exceeds 1.5 mm, the weight will increase.
【００１４】そして、上述した炭素短繊維とＰＰＳを用
い、後述する製造方法を用いることによって、板の曲げ
強度が１２〜５０kgf/mm2 程度で、曲げ弾性率が８００
〜４，０００kgf/mm2 程度の筐体を得ることができる。
また、電磁波減衰率が３０〜７０dB程度の電磁シールド
特性を有し、外部電波の影響から筐体内部の電子、電気
機器部品を保護することができるようになる。なお、電
磁波減衰率は、ＭＩＬ−ＳＴＤ−２８５に基づくアドバ
ンテスト法によって測定することができる。この方法
は、電磁シールドされたハウジング内に発信アンテナと
受信アンテナとを１０mmの間隔をおいてセットし、両ア
ンテナ間を１５０×１５０mmの被測定板で遮り、発信側
の入射電界強度と受信側の伝送電界強度との差から減衰
率を測定する方法である。By using the above-mentioned short carbon fibers and PPS and using the manufacturing method described later, the bending strength of the plate is about 12 to 50 kgf / mm 2 , and the bending elastic modulus is 800.
It is possible to obtain a housing of about 4,000 kgf / mm 2 .
Further, it has an electromagnetic shield characteristic with an electromagnetic wave attenuation factor of about 30 to 70 dB, and it becomes possible to protect electronic and electric device parts inside the housing from the influence of external radio waves. The electromagnetic wave attenuation rate can be measured by the Advantest method based on MIL-STD-285. In this method, a transmitting antenna and a receiving antenna are set at an interval of 10 mm in a housing that is electromagnetically shielded, and a space between the two antennas is shielded by a plate to be measured of 150 × 150 mm, and the incident electric field strength of the transmitting side and the receiving side are set. It is a method of measuring the attenuation rate from the difference between the transmission electric field strength and
【００１５】この発明の筐体は、シート面と平行な面内
においてランダムな方向に配向された炭素短繊維とＰＰ
Ｓとの複合シート材料を所望の筐体の形状のキャビティ
を有する型に入れ、加圧、加熱して成形することによっ
て製造する。したがって、炭素短繊維は、筐体の板面と
平行な面内において二次元ランダムな方向に配向される
ことになる。The housing of the present invention comprises short carbon fibers and PP which are oriented in random directions in a plane parallel to the sheet surface.
The composite sheet material with S is put into a mold having a cavity having a desired housing shape, and is pressed and heated to be molded. Therefore, the short carbon fibers are oriented in a two-dimensional random direction in a plane parallel to the plate surface of the housing.
【００１６】炭素短繊維とＰＰＳとの複合シート材料
は、たとえば、単繊維が二次元平面内においてランダム
な方向に配向している解繊マットや、チョップドストラ
ンドが二次元平面内においてランダムな方向に配向して
いるチョップドストランドマット等のマットの少なくと
も片面にＰＰＳフィルムを重ね合わせ、加圧、加熱して
両者を複合したり、上述したマットにＰＰＳを含浸した
りすることによって得ることができる。また、炭素繊維
束にＰＰＳをコーティングしたＰＰＳ被覆炭素繊維を予
熱した後加圧ロールに通してテープに加工し、そのテー
プを３〜１００mmの範囲の一定長に切断して金型中に散
布し、圧縮成形することによって製造することができ
る。The composite sheet material of short carbon fibers and PPS is, for example, a defibrating mat in which single fibers are oriented in a random direction in a two-dimensional plane, or chopped strands are oriented in a random direction in a two-dimensional plane. It can be obtained by superimposing a PPS film on at least one surface of an oriented mat such as a chopped strand mat and pressing and heating to combine the two, or impregnating the above-mentioned mat with PPS. In addition, PPS-coated carbon fibers obtained by coating carbon fiber bundles with PPS are preheated, passed through a pressure roll to be processed into a tape, and the tape is cut into a constant length within a range of 3 to 100 mm and dispersed in a mold. Can be manufactured by compression molding.
【００１７】そして、上述した複合シート材料を、オー
ブンや遠赤外線ヒータ等を用いて予熱した後、加熱され
た、所望の筐体の形状のキャビティを有する、たとえば
金型に入れて加圧、加熱して成形する。スタンピング成
形である。複合シート材料の予熱温度は、２９０〜３５
０℃の範囲であるのが好ましい。２９０℃よりも低いと
ＰＰＳの溶融が不十分になることがあるし、３５０℃よ
りも高いとＰＰＳの粘度特性が変動して成形のばらつき
を生じたり、ＰＰＳが劣化することがある。また、型の
設定温度は、１３０〜２４５℃の範囲であるのが好まし
い。１３０℃よりも低いと、材料が流動する前にＰＰＳ
が冷却されてショートショットを生じやすいし、２４５
℃を超えるとＰＰＳの固化が遅れ、成形に時間がかかる
ようになる。また、複合シート材料を２５０〜２９０℃
の範囲の温度に設定された型に入れて加圧、加熱して成
形した後、型の温度を１３０〜２４５℃の範囲に下げる
ようにしてもよい。The composite sheet material described above is preheated by using an oven, a far infrared heater or the like, and is then heated and has a cavity having a desired housing shape. And mold. Stamping molding. The preheating temperature of the composite sheet material is 290-35.
It is preferably in the range of 0 ° C. If it is lower than 290 ° C, the melting of PPS may be insufficient, and if it is higher than 350 ° C, the viscosity characteristics of PPS may fluctuate to cause unevenness in molding or deteriorate PPS. Further, the mold set temperature is preferably in the range of 130 to 245 ° C. If the temperature is lower than 130 ° C, PPS will flow before the material flows.
Is easily cooled and short shots are likely to occur.
If the temperature exceeds ℃, the solidification of PPS will be delayed and it will take a long time for molding. In addition, the composite sheet material is 250 to 290 ° C.
The temperature of the mold may be lowered to a range of 130 to 245 ° C. after the mold is placed in the mold set to the temperature of the range, pressurized and heated to be molded.
【００１８】加圧、加熱時の加圧力は５０〜１，０００
kgf/cm2 、加圧時間は５〜１２０秒程度とするのがよ
い。加圧力が５０kgf/cm2 未満では、複合シート材料の
流動性を十分に促進できないことがあり、１，０００kg
f/cm2 を超える加圧力は、型の寿命を短くしたり、型締
めのための機構が複雑になって型が高価になったりして
製造コストが上昇するようになる。また、加圧時間が５
秒未満では、流動後の材料が十分に冷却されず、固化し
にくくなるし、１２０秒を超えると成形サイクルが長く
なって製造コストが上昇するようになる。The pressure applied during pressurization and heating is 50 to 1,000.
It is preferable that the pressure is kgf / cm 2 and the pressing time is about 5 to 120 seconds. If the pressing force is less than 50 kgf / cm 2 , the fluidity of the composite sheet material may not be sufficiently promoted.
A pressing force of more than f / cm 2 shortens the life of the mold, complicates the mechanism for clamping the mold, and increases the cost of the mold, thus increasing the manufacturing cost. Also, pressurization time is 5
If it is less than seconds, the material after flowing is not sufficiently cooled and hard to be solidified, and if it exceeds 120 seconds, the molding cycle becomes long and the manufacturing cost increases.
【００１９】[0019]
実施例 炭素繊維（引張強度：３６０kgf/mm2 、引張弾性率：２
３，５００kgf/mm2 、単糸径：７μｍ、単糸数：３，０
００本）に、３００℃で測定した溶融粘度が７００ポイ
ズのＰＰＳをコーティングし、炭素繊維の含有率が２５
体積％のＰＰＳ被覆炭素繊維を得た。Example Carbon fiber (tensile strength: 360 kgf / mm 2 , tensile modulus: 2
3,500 kgf / mm 2 , single yarn diameter: 7 μm, number of single yarn: 3,0
(00 pieces) is coated with PPS having a melt viscosity of 700 poise measured at 300 ° C. and a carbon fiber content of 25.
Volume% PPS coated carbon fibers were obtained.
【００２０】次に、上記ＰＰＳ被覆炭素繊維を遠赤外線
ヒータを用いて３１０℃に予熱した後、３１０℃に設定
した加圧ロールに通してテープに加工した。このテープ
の幅は１０mm、厚みは０．１mmであった。Next, the PPS-coated carbon fiber was preheated to 310 ° C. using a far infrared heater, and then passed through a pressure roll set at 310 ° C. to be processed into a tape. The tape had a width of 10 mm and a thickness of 0.1 mm.
【００２１】次に、上記テープを、ロータリーカッタを
用いて長さ１０mmに切断した後、金型中に散布し、３１
０℃で圧縮成形して、炭素短繊維の含有率が２５体積
％、厚みが１．３mmの、炭素短繊維とＰＰＳとからなる
複合シート材料を得た。Next, the above tape was cut into a length of 10 mm by using a rotary cutter, and then spread in a mold, and 31
By compression molding at 0 ° C., a composite sheet material composed of short carbon fibers and PPS having a carbon short fiber content of 25% by volume and a thickness of 1.3 mm was obtained.
【００２２】次に、上記複合シート材料をオーブンに入
れて３３０℃に予熱した後、１５０℃に加熱した、パー
ソナルコンピュータの筐体の形状のキャビティを有する
金型に入れ、２００kgf/mm2 の圧力で４０秒間加圧して
成形し、図１に示すような筐体を得た。図１において、
筐体は、枠１と、リブ２と、ボス３とを有している。得
られた筐体は、板の厚みが０．９mmで、炭素短繊維の分
布は極めて均一で、炭素短繊維が枠１、リブ２やボス３
にもよく分布していた。また、得られた筐体から試験片
（板）を切り出し、曲げ強度と曲げ弾性率を測定したと
ころ、それぞれ、２１kgf/mm2 、１，６００kgf/mm2 で
あった。さらに、電磁波減衰率を測定したところ、６１
dBであった。また、ＵＬ規格に基づく不燃性の試験をし
たところ、Ｖ−０レベルに適合していた。Next, the above composite sheet material was put in an oven and preheated to 330 ° C., then put into a mold having a cavity in the shape of a personal computer housing, which was heated to 150 ° C., and a pressure of 200 kgf / mm 2 was applied. It was pressed for 40 seconds and molded to obtain a housing as shown in FIG. In FIG.
The housing has a frame 1, a rib 2, and a boss 3. The obtained casing had a plate thickness of 0.9 mm, and the distribution of short carbon fibers was extremely uniform.
Was also well distributed. Also, cut out test piece (plate) from the obtained housing was measured flexural modulus and flexural strength, respectively, 21 kgf / mm 2, was 1,600kgf / mm 2. Furthermore, when the electromagnetic wave attenuation rate was measured, it was found to be 61
It was dB. Moreover, when a nonflammability test based on the UL standard was carried out, it was found to meet the V-0 level.
【００２３】比較例１ ＰＰＳに代えて、不燃性がＵＬ規格におけるＶ−０レベ
ルにある三酸化アンチモン（難燃剤）入りナイロン６
（溶融粘度：１，５００ポイズ）を使用したほかは実施
例と同様にして筐体を得た。Comparative Example 1 Nylon 6 containing antimony trioxide (flame retardant) having nonflammability at V-0 level according to UL standard in place of PPS
A housing was obtained in the same manner as in the example except that (melt viscosity: 1,500 poise) was used.
【００２４】得られた筐体は、炭素短繊維の分布が均一
で、炭素短繊維が枠１、リブ２やボス３にも分布してい
たが、実施例と同様の不燃性試験をしたところ、Ｖ−０
レベルに適合しなかった。In the obtained casing, the short carbon fibers were evenly distributed, and the short carbon fibers were also distributed in the frame 1, the ribs 2 and the bosses 3, but the same nonflammability test as in the example was carried out. , V-0
Didn't fit the level.
【００２５】比較例２ 長さ１２mmの、実施例で用いた炭素繊維と、比較例１で
用いた三酸化アンチモン入りナイロン６のチップとを混
合しながら射出成形機のホッパーに供給し、実施例と同
じ形状の筐体を得た。Comparative Example 2 The carbon fiber having a length of 12 mm used in the example and the nylon 6 chip containing antimony trioxide used in the comparative example 1 were mixed and supplied to the hopper of the injection molding machine. A housing with the same shape as was obtained.
【００２６】得られた筐体について実施例と同様の試験
をしたところ、不燃性に関してはＶ−０レベルに適合し
ていたが、曲げ強度、曲げ弾性率、電磁波減衰率はそれ
ぞれ８kgf/mm2 、５００kgf/mm2 、２８dBと低かった。The same test as in the example was carried out on the obtained case, and it was found that the case was in conformity with the V-0 level with respect to incombustibility, but the bending strength, the bending elastic modulus, and the electromagnetic wave attenuation rate were each 8 kgf / mm 2. , 500 kgf / mm 2 , 28 dB.
【００２７】[0027]
【発明の効果】この発明の筐体は、板面と平行な面内に
おいてランダムな方向に配向された炭素短繊維とポリフ
ェニレンスルフィドとを含む複合体からなるものである
から、実施例と比較例との対比からも明らかなように、
薄くても強度や剛性、電磁シールド特性に優れ、しか
も、不燃性に優れている。The housing of the present invention is made of a composite containing short carbon fibers and polyphenylene sulfide, which are oriented in random directions in a plane parallel to the plate surface. As is clear from the comparison with
Even though it is thin, it has excellent strength, rigidity, and electromagnetic shielding properties, as well as excellent incombustibility.
【００２８】また、この発明は、そのような筐体を、シ
ート面と平行な面内においてランダムな方向に配向され
た炭素短繊維とポリフェニレンスルフィドとを含む複合
シート材料を予熱した後、所望の筐体の形状のキャビテ
ィを有する型に入れ、加圧、加熱するスタンピング成形
法によって製造するから、成形サイクルを短くすること
ができ、製造コストを大きく下げることができる。[0028] The present invention also provides such a housing after preheating a composite sheet material containing polyphenylene sulfide and short carbon fibers oriented in random directions in a plane parallel to the sheet surface. Since it is manufactured by a stamping molding method in which it is placed in a mold having a cavity in the shape of a housing and pressed and heated, the molding cycle can be shortened and the manufacturing cost can be greatly reduced.
【図１】この発明の一実施態様に係る筐体を示す概略斜
視図である。FIG. 1 is a schematic perspective view showing a housing according to an embodiment of the present invention.
【符号の説明】 １：枠 ２：リブ ３：ボス[Explanation of symbols] 1: Frame 2: Rib 3: Boss
───────────────────────────────────────────────────── 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 81:00 281:00 307:04 Ｂ２９Ｌ 22:00 31:34 ─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. 6 Identification code Office reference number FI technical display location // B29K 81:00 281: 00 307: 04 B29L 22:00 31:34
Claims (10)
に配向された炭素短繊維とポリフェニレンスルフィドと
を含む複合体からなる筐体。1. A housing made of a composite containing short carbon fibers and polyphenylene sulfide, which are oriented in random directions in a plane parallel to the plate surface.
範囲にあり、かつ、含有率が１５〜６０体積％の範囲に
ある、請求項１の筐体。2. The housing according to claim 1, wherein the average fiber length of the short carbon fibers is in the range of 3 to 100 mm, and the content is in the range of 15 to 60% by volume.
弾性率が８００kgf/mm2 以上である、請求項１または２
の筐体。3. The bending strength of the plate is 12 kgf / mm 2 or more, and the bending elastic modulus is 800 kgf / mm 2 or more.
Enclosure.
３のいずれかの筐体。4. A plate thickness of 1.5 mm or less.
Any one of the three cases.
１〜４のいずれかの筐体。5. The housing according to claim 1, wherein the electromagnetic wave attenuation factor is 30 dB or more.
子・電気機器用筐体。6. A casing for electronic / electrical equipment, comprising the casing according to claim 1.
方向に配向された炭素短繊維とポリフェニレンスルフィ
ドとを含む複合シート材料を予熱した後、所望の筐体の
形状のキャビティを有する型に入れ、加圧、加熱して成
形することを特徴とする、筐体の製造方法。7. A composite sheet material containing short carbon fibers and polyphenylene sulfide, which are oriented in random directions in a plane parallel to the sheet surface, is preheated and then placed in a mold having a cavity having a desired housing shape. A method for manufacturing a housing, which comprises molding by pressurizing and heating.
の温度に予熱した後、１３０〜２４５℃の範囲の温度に
設定された型に入れ、加圧、加熱して成形する、請求項
７の筐体の製造方法。8. The composite sheet material is preheated to a temperature in the range of 290 to 350 ° C., then placed in a mold set to a temperature in the range of 130 to 245 ° C., pressurized and heated to be molded. Of manufacturing the housing of the.
の温度に設定された型に入れ、加圧、加熱して成形した
後、型の温度を１３０〜２４５℃の範囲に下げてから脱
型する、請求項７の筐体の製造方法。9. The composite sheet material is placed in a mold set at a temperature in the range of 250 to 290 ° C., pressed and heated to be molded, and then the temperature of the mold is lowered to the range of 130 to 245 ° C. The method of manufacturing a housing according to claim 7, which comprises molding.
１，０００kgf/cm2 の圧力下に５〜１２０秒間行う、請
求項７〜９のいずれかの筐体の製造方法。10. The pressing and heating of the composite sheet material is carried out at 50 to 50.
The method for manufacturing a housing according to any one of claims 7 to 9, which is performed under a pressure of 1,000 kgf / cm 2 for 5 to 120 seconds.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7052714A JPH08244054A (en) | 1995-03-13 | 1995-03-13 | Housing and production thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7052714A JPH08244054A (en) | 1995-03-13 | 1995-03-13 | Housing and production thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH08244054A true JPH08244054A (en) | 1996-09-24 |
Family
ID=12922581
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7052714A Pending JPH08244054A (en) | 1995-03-13 | 1995-03-13 | Housing and production thereof |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH08244054A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2013011736A (en) * | 2011-06-29 | 2013-01-17 | Teijin Ltd | Thin display housing comprising fiber-reinforced composite material |
-
1995
- 1995-03-13 JP JP7052714A patent/JPH08244054A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2013011736A (en) * | 2011-06-29 | 2013-01-17 | Teijin Ltd | Thin display housing comprising fiber-reinforced composite material |
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