JPS60133799A - Master pellet for shielding electromagnetic wave - Google Patents
Master pellet for shielding electromagnetic waveInfo
- Publication number
- JPS60133799A JPS60133799A JP24174483A JP24174483A JPS60133799A JP S60133799 A JPS60133799 A JP S60133799A JP 24174483 A JP24174483 A JP 24174483A JP 24174483 A JP24174483 A JP 24174483A JP S60133799 A JPS60133799 A JP S60133799A
- Authority
- JP
- Japan
- Prior art keywords
- metal
- synthetic resin
- electromagnetic shielding
- master pellet
- producing
- 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.)
- Granted
Links
Landscapes
- Laminated Bodies (AREA)
- Manufacture Of Metal Powder And Suspensions Thereof (AREA)
- Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)
Abstract
(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.
Description
【発明の詳細な説明】
［発明の技術分野］
本発明は、金属繊維が均一に分散され電磁波シールド効
果の高い成形材料を得るために使用されるマスターペレ
ットを効率的に製造する方法に関する。DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a method for efficiently producing master pellets used to obtain a molding material in which metal fibers are uniformly dispersed and have a high electromagnetic shielding effect.
［発明の技術的背景とその問題点］ 近年、外部の妨害電波から電子回路を保護し。[Technical background of the invention and its problems] In recent years, electronic circuits have been protected from external interference.
かつ発信回路等から発生する不要な電波を外部に漏洩す
るのを防止するために電子機器の筐体を電磁波シールド
材料により形成することが要求されている。Furthermore, in order to prevent unnecessary radio waves generated from transmitting circuits and the like from leaking to the outside, it is required that the housings of electronic devices be made of electromagnetic shielding material.
このような電磁波シールド月利どしては、金属や導電性
合成樹脂かあげられるが、前者の金属は優れた電磁波シ
ールド効果を有する反面、重く、高価であり、かつ加工
性が悪いという欠点があるため、導電性合成樹脂の使用
が主流となりつつある。Metals and conductive synthetic resins can be used to shield such electromagnetic waves, but while the former metals have excellent electromagnetic shielding effects, they are heavy, expensive, and have poor workability. Therefore, the use of conductive synthetic resins is becoming mainstream.
合成樹脂に導電性を付与する方法としては、合成樹脂を
所定の形状に成形した後、導電性塗料の塗布、金属溶射
、めっき等にＪ：り表面に導電層を形成する方法と、合
成樹脂内部にカーボンや金属粉末、金属繊維等の導電性
充填材を添加する内部添加法がある。Methods of imparting conductivity to synthetic resin include forming a synthetic resin into a predetermined shape and then applying conductive paint, metal spraying, plating, etc. to form a conductive layer on the surface of the synthetic resin. There is an internal addition method in which a conductive filler such as carbon, metal powder, or metal fiber is added inside.
前者の合成樹脂表面に導電層を形成する方法は、工程が
増えて量産性に乏しく、また導電層が長時間の使用によ
り剥がれてしまうという欠点があるため、後者の内部添
加法に期待が奇けられている。The former method, in which a conductive layer is formed on the surface of a synthetic resin, requires more steps and is not suitable for mass production, and also has the disadvantage that the conductive layer peels off after long-term use. I'm being kicked.
しかしながら、後者の内部添加法にも次のような問題が
あった。However, the latter internal addition method also had the following problems.
すなわち、所望の電磁波シールド効果を発揮するために
は、カーホンや金属繊維等の導電性充填材を多量に配合
する必要があり、その結果分散不良を起こしたり、成形
品の機械的強度が低下するという欠点があった。In other words, in order to achieve the desired electromagnetic shielding effect, it is necessary to incorporate a large amount of conductive filler such as carphone or metal fibers, which may result in poor dispersion or a decrease in the mechanical strength of the molded product. There was a drawback.
特に金属繊維のうち、長さが３ ｍｍ以上の長繊維のも
のは４Ｉ組が相互に絡み合い易く、優れた電磁波シール
ド効果が期待されるが、合成樹脂中に均一に分散するこ
とが勤しく不均一な混合により成形品の物性が低下し易
かった。In particular, among metal fibers, long fibers with a length of 3 mm or more tend to have 4I pairs intertwined with each other, and are expected to have an excellent electromagnetic shielding effect, but they are difficult to disperse uniformly in synthetic resins. Due to uniform mixing, the physical properties of the molded product were likely to deteriorate.
［発明の目的］
本発明はこのような点に対処してなされたもので、合成
樹脂内部に導電性充填材を均一に分散させることかでき
、電磁波シールド効果に優れた導電性成形材料を得るこ
とのできるマスターペレットを連続的に効率よく製造す
る方法を提供することを目的とする。[Objective of the Invention] The present invention has been made in view of the above-mentioned problems, and it is an object of the present invention to obtain a conductive molding material that can uniformly disperse a conductive filler inside a synthetic resin and has an excellent electromagnetic shielding effect. The purpose of the present invention is to provide a method for continuously and efficiently producing master pellets that can be produced in a continuous manner.
３−
［発明の概要］
すなわち本発明の電磁波シールド用マスターペレットの
製造方法は、金属を溶融保持する密閉型加熱炉から多数
の金属繊維を押し出す工程と、押し出された前記金属繊
維を加熱溶融された合成樹脂中に挿通させ、金属繊維の
外側に前記合成樹脂を被覆するとともに各金属繊維を集
束一体化させる工程と、合成樹脂で集束一体化された金
属繊維束をペレット状に切断する工程とから成ることを
特徴としている。3- [Summary of the Invention] That is, the method for manufacturing a master pellet for electromagnetic shielding of the present invention includes a step of extruding a large number of metal fibers from a closed heating furnace that melts and holds metal, and heating and melting the extruded metal fibers. a step of inserting the metal fibers into a synthetic resin, coating the outside of the metal fibers with the synthetic resin and integrating each metal fiber, and a step of cutting the metal fiber bundles integrated with the synthetic resin into pellets. It is characterized by consisting of.
［発明の実施例］ 以下図面を用いて本発明の製造方法をさらに説明する。[Embodiments of the invention] The manufacturing method of the present invention will be further explained below using the drawings.
本発明においては、図面に示すように、まず密閉型加熱
炉１内に金属を溶融保持し、不活性ガスを充填し加圧し
て溶融金属２を細径のｍ紐状に引き出ず。In the present invention, as shown in the drawings, first, metal is melted and held in a closed heating furnace 1, filled with an inert gas and pressurized, and the molten metal 2 is drawn out in the form of a thin string.
上記金属としては、アルミニウム、銅、ニッケルあるい
はこれらを含む合金等を用いることができるが、溶融の
際保持炉からの異物混入を防ぐた４−
めにできるだ（プ低融点のものを用いるのが望ましい。Aluminum, copper, nickel, or an alloy containing these metals can be used as the above metal, but this can be done in order to prevent foreign matter from entering the holding furnace during melting. is desirable.
これらの金属を不活性ガスが充填された密閉型加熱炉１
で溶融状態に保持し、０．２ｋｇ／ｃｎｆ以上の圧力（
ゲージ圧）をかけて押し出すようにする。Closed heating furnace 1 filled with inert gas for these metals
Maintain it in a molten state at a pressure of 0.2 kg/cnf or more (
Gauge pressure) to push it out.
溶融金属２の押し出しは、レーザービームにより互いに
近接して多数の細径（直径５〜２００μｍ）の貫通孔が
開けられた窒化ケイ素等のセラミック板３の貫通孔を通
して行なうことが望ましい。The extrusion of the molten metal 2 is preferably carried out through through holes in a ceramic plate 3 made of silicon nitride or the like, in which a large number of through holes of small diameter (5 to 200 .mu.m in diameter) are opened close to each other by a laser beam.
次に引き出された各金属繊維４を空冷し集束して金属繊
維束５とした後、これを直ちに加熱溶融された合成樹脂
６浴中を下方に通過させ、金属繊維束５の外側および繊
維間に塗布含浸させて一体に結着させる。Next, each of the drawn metal fibers 4 is air-cooled and bundled to form a metal fiber bundle 5, which is immediately passed downward through a bath of heated and melted synthetic resin 6, so that the outer side of the metal fiber bundle 5 and the spaces between the fibers are Coat and impregnate to bind together.
ここで合成樹脂被覆前の金属繊維束５の冷却は、表面の
酸化を防ぐため不活性雰囲気中で行なうことが望ましい
。また、冷却後金属繊維束５には、合成樹脂６浴中に浸
漬する際に表面に公知のカップリング剤を塗布して合成
樹脂６との密着性を増す前処理を施しておくことが望ま
しい。Here, it is preferable that the metal fiber bundle 5 is cooled before being coated with the synthetic resin in an inert atmosphere in order to prevent oxidation of the surface. Further, it is preferable that the metal fiber bundle 5 after cooling is pretreated to increase its adhesion with the synthetic resin 6 by applying a known coupling agent to its surface when immersed in the synthetic resin 6 bath. .
合成樹脂６としＣは、ポリプロピレンやアクリロニトリ
ル−ブタジェン−スチレン共重合体樹脂のような、金属
の存在により分解劣化しない熱可塑性合成樹脂の使用が
望ましい。As the synthetic resin 6 and C, it is desirable to use a thermoplastic synthetic resin that does not decompose and deteriorate due to the presence of metals, such as polypropylene or acrylonitrile-butadiene-styrene copolymer resin.
これらの合成樹脂の被覆は、図示したように、ディップ
塗布により行なうことができる他、通常の押出被覆機を
用いても行なうことができる。さらに合成樹脂が一体に
被覆された金属繊維束７の直径は、２〜１０ｍｍである
ことが望ましい。Coating with these synthetic resins can be carried out by dip coating as shown in the figure, or by using an ordinary extrusion coating machine. Furthermore, the diameter of the metal fiber bundle 7 integrally coated with synthetic resin is preferably 2 to 10 mm.
次に合成樹脂被覆金属繊維束７をカッタ８を用いて２〜
２０ ｕの長さのペレット状に連続的に切断する。こう
し−Ｃ溶融金属２から一貫して連続的に製造されたマス
ターペレットは、長さ２〜２０ｍｌ１ｌの金属長繊維が
合成樹脂により被覆一体化された構造をしており、通常
の成形用合成樹脂のナチュラルペレットと混合すること
により合成樹脂中に金属繊維が均一に分散され、機械的
強度が高く電磁波シールド効果に優れた導電性成形材料
が得られる。Next, the synthetic resin-coated metal fiber bundle 7 is cut into two to
Cut continuously into pellets of 20 u length. The master pellets produced consistently and continuously from Koushi-C molten metal 2 have a structure in which long metal fibers with a length of 2 to 20 ml 1 liter are coated with synthetic resin, and are made of ordinary synthetic resin for molding. By mixing with natural resin pellets, metal fibers are uniformly dispersed in the synthetic resin, resulting in a conductive molding material with high mechanical strength and excellent electromagnetic shielding effect.
［発明の実施例］ 次に本発明の実施例についＣ記載する。[Embodiments of the invention] Next, examples of the present invention will be described.
実施例
密閉型加熱炉ＵＨ−４００（東芝セラミック社の商品名
）内で７２０℃の温度に加熱し゛Ｃ溶融させたアルミニ
ウムを、０．２ｋｇ／ｃｊの圧力（ゲージ圧）の窒素ガ
スをを圧入して直径１００μｍの細孔が多数あけられた
窒化ケイ素板を通して繊維状に押し出した。次に引き出
されたアルミニウム繊維の束を窒素雰囲気中で冷却した
後、加熱溶融されたポリプロピレン樹脂中を通してこれ
を一体に被覆した。Example Aluminum was heated to 720°C and molten in a closed heating furnace UH-400 (trade name of Toshiba Ceramic Co., Ltd.), and nitrogen gas was injected at a pressure of 0.2 kg/cj (gauge pressure). Then, it was extruded into a fiber form through a silicon nitride plate with many pores with a diameter of 100 μm. Next, the drawn bundle of aluminum fibers was cooled in a nitrogen atmosphere, and then passed through heated and melted polypropylene resin to be integrally coated.
次いでこうして得られた直径約３龍のポリプロピレン被
覆アルミニウム繊維束をカッタを用いて約５ ｍｍの長
さに切断しマスターペレットした。Next, the thus obtained polypropylene-coated aluminum fiber bundle having a diameter of about 3 mm was cut into a length of about 5 mm using a cutter to form master pellets.
こうして製造されたマスターペレット１重量部と９重量
部のポリプロピレンのナチュラルペレットとを混合し、
これを押出機に供給して混練し、厚さが４開の板状成形
品を射出成形した。Mixing 1 part by weight of the master pellets thus produced and 9 parts by weight of natural polypropylene pellets,
This was supplied to an extruder and kneaded, and a plate-shaped molded product with a thickness of 4 mm was injection molded.
得られた成形品は内部にアルミニウムの長繊維が均一に
分散しており、強度の低下や劣化は見ら７−
れなかった。また、この成形品の電磁波シールド効果を
測定したところ、５００ Ｍ Ｈ２で４０ｄＢと極めて
高い電磁波シールド効果を有することが認められた。In the molded product obtained, long aluminum fibers were uniformly dispersed inside, and no decrease in strength or deterioration was observed7-. Furthermore, when the electromagnetic shielding effect of this molded product was measured, it was found that it had an extremely high electromagnetic shielding effect of 40 dB at 500 MH2.
［発明の効果］
以上の記載から明らかなように、本発明によれば、金属
ｓｌ維紐束周囲に合成樹脂が一体に被覆された構造のマ
スターペレットを連続的に効率よく製造することができ
る。[Effects of the Invention] As is clear from the above description, according to the present invention, master pellets having a structure in which a synthetic resin is integrally coated around a metal SL fiber bundle can be continuously and efficiently manufactured. .
また、得られたマスターペレットを一般の成形用合成樹
脂のナチュラルペレットと混合することにより、金属Ｉ
！雑が均一に分散された、電磁波シールド効果が高く、
しかも機械的強度の大きい合成樹脂形成量を製造するこ
とができる。In addition, by mixing the obtained master pellets with natural pellets of general synthetic resin for molding, metal I
! It has a high electromagnetic shielding effect with evenly distributed interference,
Moreover, it is possible to produce a synthetic resin with high mechanical strength.
図面は本発明の製造方法の一例を示す説明図である。
１・・・・・・・・・・・・密閉型加熱炉２・・・・・
・・・・・・・溶融金属
３・・・・・・・・・・・・セラミック板８−
５・・・・・・・・・・・・金属１ＪＡ紐束６・・・・
・・・・・・・・合成樹脂
８・・・・・・・・・・・・カッタ
９・・・・・・・・・・・・マスターペレット代理人弁
理士 須 山 佐 −The drawings are explanatory diagrams showing an example of the manufacturing method of the present invention. 1......Closed heating furnace 2...
......Molten metal 3...Ceramic plate 8-5...Metal 1JA string bundle 6...
・・・・・・・・・Synthetic resin 8・・・・・・・・・Cutter 9・・・・・・・・・Master Pellet agent Patent attorney Sa Suyama −
Claims (6)
ｍ維を押し出す工程と、押し出された前記金属繊維を加
熱溶融された合成、樹脂中に挿通させ、金属繊維の外側
に前記合成樹脂を被覆するとともに各金属ｕＡＮを集束
一体化させる工程と、合成樹脂で集束一体化された金属
ｍ紐束をペレット状に切断する工程とから成ることを特
徴とする電磁波シールド用マスターペレットの製造方法
。(1) A step of extruding a large number of metal fibers from a closed heating furnace that melts and holds the metal, and inserting the extruded metal fibers into a heated and molten synthetic resin, and placing the synthetic resin on the outside of the metal fibers. A method for producing a master pellet for electromagnetic shielding, characterized by comprising the steps of coating and integrating each metal uAN, and cutting the metal m-string bundle bundled and integrated with a synthetic resin into pellets. .
れらの金属を含む合金から選ばれたものである特許請求
の範囲第１項記載の電磁波シールド用マスターペレット
の製造方法。(2) The method for producing a master pellet for electromagnetic shielding according to claim 1, wherein the metal is selected from aluminum, copper, nickel, or an alloy containing these metals.
る特許請求の範囲第１項または第２項記載の電磁波シー
ルド用マスターペレットの製造方法。(3) The method for manufacturing a master pellet for electromagnetic shielding according to claim 1 or 2, wherein the metal 11M has a diameter of 5 to 2OO μm.
ムにより互いに近接して穿設されたセラミック板の前記
細径の孔を通して押し出される特許請求の範囲第１項な
いし第３項のいずれか１項記載の電磁波シールド用マス
ターペレットの製造方法。(4) The metal tJAH is extruded through a plurality of small diameter holes of a ceramic plate in which a plurality of small diameter holes are bored close to each other by a laser beam. A method for producing a master pellet for electromagnetic shielding according to item 1.
径が２〜１０ｍｍのものである特許請求の範囲第１項な
いし第４項のいずれか１項記載の電磁波シールド用マス
ターペレットの製造方法。(5) The master pellet for electromagnetic shielding according to any one of claims 1 to 4, wherein the metal #AM bundle integrated with synthetic resin has a diameter of 2 to 10 mm. Production method.
ｍｎ＋の長さに切断される特許請求の範囲第１項ないし
第５項のいずれか１項記載の電磁波シールド用マスター
ペレットの製造方法。(6) The metal fiber bundle integrated with synthetic resin has 2 to 20
A method for producing a master pellet for electromagnetic shielding according to any one of claims 1 to 5, which is cut into lengths of mn+.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP24174483A JPS60133799A (en) | 1983-12-21 | 1983-12-21 | Master pellet for shielding electromagnetic wave |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP24174483A JPS60133799A (en) | 1983-12-21 | 1983-12-21 | Master pellet for shielding electromagnetic wave |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS60133799A true JPS60133799A (en) | 1985-07-16 |
| JPH0249554B2 JPH0249554B2 (en) | 1990-10-30 |
Family
ID=17078894
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP24174483A Granted JPS60133799A (en) | 1983-12-21 | 1983-12-21 | Master pellet for shielding electromagnetic wave |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS60133799A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61190199U (en) * | 1985-05-21 | 1986-11-27 | ||
| JPS6245659A (en) * | 1985-08-23 | 1987-02-27 | Eng Plast Kk | Electrically conductive molding material |
| US5992420A (en) * | 1998-06-25 | 1999-11-30 | Moriyama; Yasunobu | Cigarette-attached extinguishing device |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6081900A (en) * | 1983-10-11 | 1985-05-09 | 藤倉ゴム工業株式会社 | Method of producing conductive thermoplastic resin for shielding electromagnetic wave |
-
1983
- 1983-12-21 JP JP24174483A patent/JPS60133799A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6081900A (en) * | 1983-10-11 | 1985-05-09 | 藤倉ゴム工業株式会社 | Method of producing conductive thermoplastic resin for shielding electromagnetic wave |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61190199U (en) * | 1985-05-21 | 1986-11-27 | ||
| JPH0517920Y2 (en) * | 1985-05-21 | 1993-05-13 | ||
| JPS6245659A (en) * | 1985-08-23 | 1987-02-27 | Eng Plast Kk | Electrically conductive molding material |
| JPH0254864B2 (en) * | 1985-08-23 | 1990-11-22 | Nippon Jii Ii Purasuchitsukusu Kk | |
| US5992420A (en) * | 1998-06-25 | 1999-11-30 | Moriyama; Yasunobu | Cigarette-attached extinguishing device |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0249554B2 (en) | 1990-10-30 |
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