JPH06345337A - Synthetic resin-made bobbin - Google Patents
Synthetic resin-made bobbinInfo
- Publication number
- JPH06345337A JPH06345337A JP5131964A JP13196493A JPH06345337A JP H06345337 A JPH06345337 A JP H06345337A JP 5131964 A JP5131964 A JP 5131964A JP 13196493 A JP13196493 A JP 13196493A JP H06345337 A JPH06345337 A JP H06345337A
- Authority
- JP
- Japan
- Prior art keywords
- raw material
- bobbin
- weight
- synthetic resin
- ethylene
- 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
- Storage Of Web-Like Or Filamentary Materials (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、軽量性、耐衝撃性、寸
法安定性、均一発泡性等に優れた発泡合成樹脂製ボビン
に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a foam synthetic resin bobbin which is excellent in lightness, impact resistance, dimensional stability and uniform foamability.
【０００２】[0002]
【従来の技術】近年、高度情報化社会の基盤として電線
や光ファイバーケーブルを利用した通信網の構築が進め
られている。電線や光ファイバーケーブルは従来、木
製、金属製或いは合成樹脂製のボビンに巻回して取り扱
われている。2. Description of the Related Art Recently, the construction of a communication network using electric wires and optical fiber cables has been promoted as the basis of an advanced information society. Conventionally, electric wires and optical fiber cables have been handled by winding them around a bobbin made of wood, metal or synthetic resin.
【０００３】[0003]
【発明が解決しようとする課題】木製或いは金属製のボ
ビンは大型化するほど重量の大幅な増加を伴うため、敷
設作業の効率が著しく低下し、樹脂材料は一般には剛性
に難点がある。本発明者等は種々検討の結果、合成樹脂
製ボビンの樹脂組成を特殊の組成とすることにより問題
を解決し得ることを見出し、本発明を完成した。As a bobbin made of wood or metal increases in size as the bobbin becomes larger, the efficiency of the laying work is significantly reduced, and the resin material generally has difficulty in rigidity. As a result of various studies, the present inventors have found that the problem can be solved by making the resin composition of the synthetic resin bobbin a special composition, and completed the present invention.
【０００４】本発明の要旨は、線状の材料を巻回するの
に用いる合成樹脂製のボビンであって、該ボビンが、カ
ーボンブラックを０．０５〜０．２重量％含有するポリ
エチレン樹脂を倍率１．０５〜１．５倍に発泡させた粒
状体とした原料Ａ及びポリエチレン樹脂粒状体からなる
原料Ｂを用意し、原料Ａが５〜４５重量％、原料Ｂが５
５〜９５重量％の混合原料１００重量部に対し、発泡剤
を加えた混合物を射出成形して得た発泡倍率１．０５〜
１．５の射出成形品によって形成されたものであること
を特徴とする合成樹脂製ボビンに存する。The gist of the present invention is a synthetic resin bobbin used for winding a linear material, wherein the bobbin comprises a polyethylene resin containing 0.05 to 0.2% by weight of carbon black. A raw material A, which is a granular material foamed at a magnification of 1.05 to 1.5 times, and a raw material B made of polyethylene resin granular material are prepared. The raw material A is 5 to 45% by weight and the raw material B is 5
A foaming ratio of 1.05 obtained by injection-molding a mixture obtained by adding a foaming agent to 100 parts by weight of a mixed raw material of 5 to 95% by weight.
A bobbin made of a synthetic resin characterized by being formed by an injection-molded article of 1.5.
【０００５】本発明のボビンについて説明する。本発明
のボビンは基本的にはポリエチレンの低発泡成形品から
なり、このような材質とすることにより成形品を肉厚の
ものとすることが可能となり剛性、耐撓み性に優れた設
計とすることができる。The bobbin of the present invention will be described. The bobbin of the present invention is basically made of a polyethylene low-foam molded product, and by using such a material, it is possible to make the molded product thick and to design it with excellent rigidity and flex resistance. be able to.
【０００６】一方、上述したような低発泡成形品だけで
は素材としての耐衝撃性の向上は望めない。そこで合成
樹脂製ボビンを構成する樹脂組成を耐衝撃性に優れたも
のとし、低発泡構造と組合せることにより総合的に大変
優れたボビンを提供する。On the other hand, improvement in impact resistance as a raw material cannot be expected only with the low-foam molded article as described above. Therefore, by providing a synthetic resin bobbin with a resin composition having excellent impact resistance and combining the resin composition with a low foaming structure, a bobbin having a very excellent overall performance is provided.
【０００７】合成樹脂製ボビンを構成する樹脂組成は以
下の通りとする。カーボンブラックを０．０５〜０．２
重量％含有するポリエチレン樹脂からなる倍率１．０５
〜１．５倍に発泡した粒状体からなる原料Ａを用意す
る。原料Ａを予め倍率１．０５〜１．５倍に発泡させる
ことにより得ようとする最終成形品の発泡状態が良好と
なる。本発明の大きな特徴点がここにある。原料Ａの成
分であるポリエチレン樹脂の一例としてはエチレン単独
重合体又はエチレンと他のαーオレフィンとの共重合体
が挙げられ、無発泡状態での密度が０．９４〜０．９７
ｇ／ｃｍ3（ＪＩＳ Ｋ ６９１１）でメルトインデッ
クス２〜１０ｇ／１０分、好ましくは３〜７ｇ／１０
分、（ＪＩＳ Ｋ ７２１０）のものが良い。エチレン
と他のαーオレフィンとの共重合体を用いる場合、共重
合されるαーオレフィンとしては、プロピレン、ブテ
ン、イソプレン、ペンテン、メチルペンテン等が挙げら
れ共重合量としては０．２〜８重量％程度が好ましい。The resin composition of the synthetic resin bobbin is as follows. Carbon black 0.05 to 0.2
Magnification 1.05 consisting of polyethylene resin containing wt%
A raw material A made of a granular material which is foamed up to 1.5 times is prepared. By foaming the raw material A in advance at a ratio of 1.05 to 1.5, the foamed state of the final molded product to be obtained becomes good. This is a major feature of the present invention. As an example of the polyethylene resin which is a component of the raw material A, an ethylene homopolymer or a copolymer of ethylene and another α-olefin can be mentioned, and the density in a non-foamed state is 0.94 to 0.97.
g / cm 3 (JIS K 6911), melt index 2 to 10 g / 10 minutes, preferably 3 to 7 g / 10
Minutes (JIS K 7210) are good. When a copolymer of ethylene and another α-olefin is used, examples of the α-olefin to be copolymerized include propylene, butene, isoprene, pentene, and methylpentene, and the copolymerization amount is 0.2 to 8% by weight. A degree is preferable.
【０００８】原料Ａには、更にエチレン−酢酸ビニル共
重合体が含有されていることが望ましい、エチレン−酢
酸ビニル共重合体の原料Ａに含まれる量としては０．２
〜５重量％程度が良い、このエチレン−酢酸ビニル共重
合体としては酢酸ビニル成分が１０〜２５重量％、好ま
しくは１５〜２０重量％のものが用いられる。エチレン
−酢酸ビニル共重合体が含有された場合の原料Ａの成分
割合は、カーボンブラック０．０５〜０．２重量％、エ
チレン−酢酸ビニル共重合体０．２〜５重量％、ポリエ
チレン樹脂９４．８〜９９．７５重量％のようになる。
これらの成分からなる原料Ａは倍率１．０５〜１．５倍
に発泡した粒状体からなる。例えば、カーボンブラック
が配合されたポリエチレン樹脂であって１．０５〜１．
５倍に発泡された粒状物と無発泡のエチレン−酢酸ビニ
ル共重合体粒状物との混合物とするのが一般的である。
原料Ａの発泡したポリエチレン樹脂にはタルク等の無機
粉末や顔料、各種添加剤が加えられていてもよい。発泡
は後述する発泡剤を添加して成形する等しておこなわれ
る。無機粉末を添加する場合には０．０５〜３．０重量
％程度であろう。原料Ａは直径１５ｍｍの開孔を通過す
る大きさの粒状体であることが望ましい。It is desirable that the raw material A further contains an ethylene-vinyl acetate copolymer. The amount of the ethylene-vinyl acetate copolymer contained in the raw material A is 0.2.
The ethylene-vinyl acetate copolymer has a vinyl acetate component of 10 to 25% by weight, preferably 15 to 20% by weight. When the ethylene-vinyl acetate copolymer is contained, the content ratio of the raw material A is 0.05 to 0.2% by weight of carbon black, 0.2 to 5% by weight of ethylene-vinyl acetate copolymer, and the polyethylene resin 94. 8 to 99.75% by weight.
The raw material A composed of these components is a granular material foamed at a magnification of 1.05 to 1.5. For example, a polyethylene resin blended with carbon black, which is 1.05-1.
It is generally a mixture of 5-fold expanded particles and non-expanded ethylene-vinyl acetate copolymer particles.
Inorganic powder such as talc, pigment, and various additives may be added to the foamed polyethylene resin of the raw material A. Foaming is performed by adding a foaming agent described later and molding. If inorganic powder is added, it will be about 0.05 to 3.0% by weight. The raw material A is preferably a granular material having a size that passes through an opening having a diameter of 15 mm.
【０００９】原料Ａと混合する原料Ｂのポリエチレン樹
脂の一例としてはエチレン単独重合体又はエチレンと他
のαーオレフィンとの共重合体が挙げられ、密度０．９
４〜０．９７ｇ／ｃｍ3（ＪＩＳ Ｋ ６９１１）でメ
ルトインデックス２〜１０ｇ／１０分、好ましくは３〜
７ｇ／１０分、（ＪＩＳ Ｋ ７２１０）のものが良
い。エチレンと共重合される他のαーオレフィンとして
は、プロピレン、ブテン、イソプレン、ペンテン、メチ
ルペンテン等が挙げられ共重合量としては０．２〜８重
量％程度が好ましい。また、これらのポリエチレン樹脂
粒状体は直径１５ｍｍの開孔を通過する大きさの粒状体
であることが望ましい。原料Ａと原料Ｂは原料Ａ５〜４
５重量％、原料Ｂ５５〜９５重量％の割合で混合され、
この混合原料１００重量部に対し、発泡剤を通常０．５
〜２．０重量部程度加えた混合物に調製される。この場
合の調製は通常ドライブレンドが用いられる。An example of the polyethylene resin of the raw material B mixed with the raw material A is an ethylene homopolymer or a copolymer of ethylene and another α-olefin, and has a density of 0.9.
4 to 0.97 g / cm 3 (JIS K 6911), melt index 2 to 10 g / 10 minutes, preferably 3 to
7 g / 10 min, (JIS K 7210) is preferable. Examples of other α-olefin copolymerized with ethylene include propylene, butene, isoprene, pentene, and methylpentene, and the copolymerization amount is preferably about 0.2 to 8% by weight. Further, it is desirable that these polyethylene resin granules are granules of a size that passes through an opening having a diameter of 15 mm. Raw materials A and B are raw materials A5-4
5% by weight, the raw material B is mixed in a proportion of 55 to 95% by weight,
A blowing agent is usually added to 0.5 parts by weight per 100 parts by weight of this mixed raw material.
~ 2.0 parts by weight is added to prepare a mixture. In this case, dry blending is usually used.
【００１０】発泡剤としては、通常使用されている有機
質または無機質の発泡剤が使用可能である、例えばＮ，
Ｎ’−ジニトロソペンタメチレンテトラミン、Ｐ，Ｐ’
−オキシビスベンゼンスルホニルヒドラジド、Ｐ−トル
エンスルホニルヒドラジド、アゾビスイソブチルニトリ
ル、アゾジカルボン酸アミド、重炭酸ナトリウム、硝酸
アンモン等が挙げられる。通常、分解温度が１８０〜２
３０°Ｃ程度のものが好適に用いられる。また、気体の
発泡剤として窒素ガス、炭酸ガス等があげられ、これら
の気体の発泡剤は上記した有機質または無機質の発泡剤
と併用して使用出来る。発泡助剤として無機粉末を併用
するのが好ましく。無機粉末は平均粒径０．５〜３０μ
程度のものを原料Ａと原料Ｂの混合原料１００重量部に
対し、０．０５〜３．０重量部程度用いるのが良い。As the foaming agent, a commonly used organic or inorganic foaming agent can be used.
N'-dinitrosopentamethylenetetramine, P, P '
-Oxybisbenzenesulfonyl hydrazide, P-toluenesulfonyl hydrazide, azobisisobutyl nitrile, azodicarboxylic acid amide, sodium bicarbonate, ammonium nitrate and the like. Decomposition temperature is usually 180-2
A temperature of about 30 ° C is preferably used. Further, examples of the gas foaming agent include nitrogen gas and carbon dioxide gas, and these gas foaming agents can be used in combination with the above-mentioned organic or inorganic foaming agents. It is preferable to use an inorganic powder together as a foaming aid. Inorganic powder has an average particle size of 0.5 to 30 μ
It is preferable to use about 0.05 to 3.0 parts by weight with respect to 100 parts by weight of the mixed raw material A and raw material B.
【００１１】無機粉末としてはタルク、炭酸カルシウ
ム、ケイ酸カルシウム、クレー、カオリン、シリカ、ケ
イソウ土、アルミナ、酸化チタン等の一般的に合成樹脂
の充填剤として用いられるものであればいずれでも良
く、単独もしくは混合して用いられる。更に、フェノー
ル系、チオエーテル系、リン系、脂肪酸金属塩などの熱
安定剤を原料Ａと原料Ｂの混合原料１００重量部に対
し、０．０１〜０．５重量部程度用いるのが良い。ベン
ゾトリアゾール系（商品名チヌビン３２６ 日本チバガ
イギー社製等）等の耐候剤やサノールＬＳ−７７０（商
品名）（三共（株）製）等の光安定剤を原料Ａと原料Ｂ
の混合原料１００重量部に対し、０．０１〜１．０重量
部程度用いるのが良い。更に、目的に応じタルク等の無
機粉末、カーボンブラック、チタンホワイト等の無機・
有機の顔料等種々の添加剤を加えても良い。The inorganic powder may be any one commonly used as a filler for synthetic resins such as talc, calcium carbonate, calcium silicate, clay, kaolin, silica, diatomaceous earth, alumina and titanium oxide. Used alone or as a mixture. Further, it is preferable to use a heat stabilizer such as phenol-based, thioether-based, phosphorus-based, and fatty acid metal salt in an amount of about 0.01 to 0.5 parts by weight based on 100 parts by weight of the mixed raw material A and raw material B. A raw material A and a raw material B such as a weathering agent such as benzotriazole type (trade name: TINUVIN 326 manufactured by Nippon Ciba Geigy) or a light stabilizer such as SANOL LS-770 (trade name) (manufactured by Sankyo Co., Ltd.)
It is preferable to use about 0.01 to 1.0 parts by weight with respect to 100 parts by weight of the mixed raw material. Furthermore, depending on the purpose, inorganic powder such as talc, inorganic materials such as carbon black, titanium white, etc.
Various additives such as organic pigments may be added.
【００１２】上述した組成の合成樹脂を射出成形して、
ボビンを得る。射出成形条件は、通常の条件でよく、例
えば、溶融温度（シリンダ温度）２００〜２５０°Ｃ、
射出率２０００〜５０００ｃｃ／ｓｅｃ程度の条件が選
ばれる。得られた成形品は表面に無発泡層を有する発泡
倍率１．０５〜１．５程度のものとなる。原料Ａを予め
倍率１．０５〜１．５倍に発泡した粒状体とすることに
より均一な発泡が行われ、寸法安定性の向上に役立つと
考えられ、カーボンブラックは耐候性の向上に役立つと
考えられる。原料Ａ中のエチレン−酢酸ビニル共重合体
は耐衝撃性の向上に役立つと考えられる。Injection molding of a synthetic resin having the above composition,
Get the bobbin. The injection molding conditions may be ordinary conditions, for example, a melting temperature (cylinder temperature) of 200 to 250 ° C,
A condition of an injection rate of about 2000 to 5000 cc / sec is selected. The obtained molded product has a non-foaming layer on the surface and a foaming ratio of about 1.05 to 1.5. It is considered that the raw material A is preliminarily foamed to a ratio of 1.05 to 1.5 times for uniform foaming, which is considered to be useful for improving dimensional stability. Carbon black is believed to be useful for improving weather resistance. Conceivable. The ethylene-vinyl acetate copolymer in raw material A is considered to help improve impact resistance.
【００１３】ボビンは射出成形により一体成形してもよ
いが、ボビンを数個の分割された部材として射出成形
し、これを溶着等により組み立てることも考えられる。
この溶着法によれば内部のリブ等の構造を一体成形のも
のに比べ複雑な構造とすることが出来る。溶着の方法と
しては、表面を弗素樹脂等で加工した加熱板の表面に、
ボビンを形成する部材の溶着する部分を押しつけて溶融
状態とし、これを互いに付き合わせて押圧することによ
ればよい。ボビン形成部材は上記した組成で形成されて
いるから寸法安定性が良く、突き合わせて溶接する際に
突合せ面の位置ずれが少なく、溶着部強度が向上する。The bobbin may be integrally molded by injection molding, but it is also conceivable that the bobbin is injection molded as several divided members and then assembled by welding or the like.
According to this welding method, the internal ribs and the like can have a more complicated structure than the integrally formed structure. As a welding method, the surface of the heating plate whose surface is processed with a fluororesin,
It suffices to press the welded parts of the members forming the bobbin into a molten state, and then press these parts against each other. Since the bobbin forming member is formed of the above-mentioned composition, it has good dimensional stability, the displacement of the butted surfaces is small when the butting and welding are performed, and the welded portion strength is improved.
【００１４】[0014]
実施例１ カーボンブラックを０．１重量％、タルク０．２重量％
含有する発泡倍率１．２のポリエチレン樹脂（密度０．
９６ｇ／ｃｍ3、ＭＩ４ｇ／１０分）の粒状体からなる
原料Ａ（平均径７ｍｍ）を用意した。平均径７ｍｍの大
きさの粒状のポリエチレン樹脂（密度０．９６ｇ／ｃｍ
3、ＭＩ：４ｇ／１０分）からなる原料Ｂを用意した。
原料Ａ１０重量部、原料Ｂ９０重量部、カーボンブラッ
ク０．１重量部、アゾジカルボンアミド（発泡剤）０．
８重量部を加えた混合物を混合機でドライブレンドし
た。このようにして調製した原料を温度２２０°Ｃ、射
出率３０００ｃｃ／ｓｅｃで射出成形し、発泡倍率１．
２の、ボビンを２分割した形状のボビン形成部材を得
た。２つのボビン形成部材の対向面を弗素樹脂等で加工
した加熱板（２２０°Ｃ）の表面に押しつけ、溶融状態
とし、これを互いに付き合わせて押圧することにより一
体化した。得られた合成樹脂製ボビンは剛性、寸法安定
性等に優れたものであった。Example 1 0.1% by weight of carbon black and 0.2% by weight of talc
Polyethylene resin with a foaming ratio of 1.2 (density 0.
A raw material A (average diameter 7 mm) made of a granular material of 96 g / cm 3 , MI 4 g / 10 min) was prepared. Granular polyethylene resin with an average diameter of 7 mm (density 0.96 g / cm
3 , raw material B consisting of MI: 4 g / 10 min) was prepared.
Raw material A 10 parts by weight, raw material B 90 parts by weight, carbon black 0.1 parts by weight, azodicarbonamide (foaming agent) 0.
The mixture containing 8 parts by weight was dry blended in a mixer. The raw material thus prepared was injection-molded at a temperature of 220 ° C. and an injection rate of 3000 cc / sec, and the expansion ratio was 1.
A bobbin forming member having a shape in which the bobbin was divided into two was obtained. The opposing surfaces of the two bobbin forming members were pressed against the surface of a heating plate (220 ° C.) processed with a fluororesin or the like to bring them into a molten state, and they were integrated by pressing them against each other. The obtained synthetic resin bobbin was excellent in rigidity and dimensional stability.
【００１５】実施例２ カーボンブラックを０．１重量％、タルク０．２重量％
含有する発泡倍率１．２のポリエチレン樹脂（密度０．
９６ｇ／ｃｍ3、ＭＩ４ｇ／１０分）の粒状体９８重量
部、エチレン−酢酸ビニル共重合体（酢酸ビニル含有量
１９重量％）の粒状体２重量部、からなる原料Ａ（エチ
レン−酢酸ビニル共重合体の大部分は粒状のポリエチレ
ン樹脂の表面に付着した状態で存在）（平均径７ｍｍ）
を用意した。Example 2 0.1% by weight of carbon black and 0.2% by weight of talc
Polyethylene resin with a foaming ratio of 1.2 (density 0.
96 g / cm 3 , MI 4 g / 10 min) of 98 parts by weight of granules, ethylene-vinyl acetate copolymer (vinyl acetate content 19% by weight) of granules 2 parts by weight of raw material A (ethylene-vinyl acetate copolymer Most of the polymer exists in the state of being attached to the surface of the granular polyethylene resin) (average diameter 7 mm)
Prepared.
【００１６】平均径７ｍｍの大きさの粒状のポリエチレ
ン樹脂（密度０．９６ｇ／ｃｍ3、ＭＩ：４ｇ／１０
分）からなる原料Ｂを用意した。原料Ａ１０重量部、原
料Ｂ９０重量部、カーボンブラック０．１重量部、アゾ
ジカルボンアミド（発泡剤）０．８重量部を加えた混合
物を混合機でドライブレンドした。このようにして調製
した原料を温度２２０°Ｃ、射出率３０００ｃｃ／ｓｅ
ｃで射出成形し、発泡倍率１．２の、ボビンを２分割し
た形状のボビン形成部材を得た。２つのボビン形成部材
の下面側を弗素樹脂等で加工した加熱板（２２０°Ｃ）
の表面に押しつけ、溶融状態とし、これを互いに付き合
わせて押圧することにより一体化した。得られた合成樹
脂製ボビンは耐衝撃性、剛性、寸法安定性等に優れたも
のであった。Granular polyethylene resin having an average diameter of 7 mm (density 0.96 g / cm 3 , MI: 4 g / 10
Min) was prepared. A mixture obtained by adding 10 parts by weight of raw material A, 90 parts by weight of raw material B, 0.1 part by weight of carbon black, and 0.8 part by weight of azodicarbonamide (foaming agent) was dry blended with a mixer. The raw material prepared in this manner was used at a temperature of 220 ° C. and an injection rate of 3000 cc / se.
By injection molding with c, a bobbin forming member having a foaming ratio of 1.2 and a bobbin divided into two parts was obtained. A heating plate (220 ° C) in which the lower surfaces of the two bobbin forming members are processed with fluorine resin or the like.
Were pressed against the surface of the to make them in a molten state, and they were brought into contact with each other and pressed to be integrated. The obtained synthetic resin bobbin was excellent in impact resistance, rigidity, dimensional stability and the like.
【００１７】[0017]
【発明の効果】このようにして得られたボビンは、原料
Ａを予め倍率１．０５〜１．５倍に発泡した粒状体とす
ることにより最終製品が均一な発泡体となり、寸法安定
性の向上、に役立つと考えられ、カーボンブラックは耐
候性向上に役立つと考えられる。原料Ａ中のエチレン−
酢酸ビニル共重合体は耐衝撃性の向上に役立つと考えら
れる。これらの働きにより寸法安定性に優れるボビンと
なるので、ボビンを分割した形状の部材として形成し、
溶着により組み立てる方式とした場合にも溶着部がズレ
て溶着されるようなことが少なくなり製品強度の均一
化、歩留まり向上も望まれる。このようにして耐衝撃
性、剛性、寸法安定性等に優れた合成樹脂製ボビンが得
られる。EFFECTS OF THE INVENTION The bobbin thus obtained has a dimensional stability with a final product made into a uniform foam by making the raw material A into a granular body which has been previously expanded to a ratio of 1.05 to 1.5. It is thought that carbon black is useful for improving weather resistance. Ethylene in raw material A
The vinyl acetate copolymer is believed to help improve impact resistance. By these functions, it becomes a bobbin with excellent dimensional stability, so form the bobbin as a member with a divided shape,
Even when the method of assembling by welding is adopted, it is less likely that the welded portion is displaced and welded, and it is desired to make the product strength uniform and improve the yield. Thus, a synthetic resin bobbin excellent in impact resistance, rigidity, dimensional stability and the like can be obtained.
Claims (6)
脂製のボビンであって、該ボビンが、カーボンブラック
を０．０５〜０．２重量％含有するポリエチレン樹脂を
倍率１．０５〜１．５倍に発泡させた粒状体とした原料
Ａ及びポリエチレン樹脂粒状体からなる原料Ｂを用意
し、原料Ａが５〜４５重量％、原料Ｂが５５〜９５重量
％の混合原料１００重量部に対し、発泡剤を加えた混合
物を射出成形して得た発泡倍率１．０５〜１．５の射出
成形品によって形成されたものであることを特徴とする
合成樹脂製ボビン。1. A bobbin made of a synthetic resin used for winding a linear material, wherein the bobbin contains a polyethylene resin containing 0.05 to 0.2% by weight of carbon black at a magnification of 1.05. Prepare a raw material A in the form of a granular body expanded to 1.5 times and a raw material B made of polyethylene resin granular material, and the raw material A is 5 to 45% by weight and the raw material B is 55 to 95% by weight. A bobbin made of synthetic resin, characterized in that it is formed by an injection-molded article having a foaming ratio of 1.05 to 1.5 obtained by injection molding a mixture containing a foaming agent.
脂製のボビンであって、該ボビンが、カーボンブラック
０．０５〜０．２重量％、エチレン−酢酸ビニル共重合
体０．２〜５重量％、ポリエチレン樹脂９４．８〜９
９．７５重量％からなる倍率１．０５〜１．５倍に発泡
させた粒状体とした原料Ａ及びポリエチレン樹脂粒状体
からなる原料Ｂを用意し、原料Ａが５〜４５重量％、原
料Ｂが５５〜９５重量％からなる原料１００重量部に対
し、発泡剤を加えた混合物を射出成形して得た発泡倍率
１．０５〜１．５の射出成形品によって形成されたもの
であることを特徴とする合成樹脂製ボビン。2. A bobbin made of a synthetic resin used for winding a linear material, wherein the bobbin comprises 0.05 to 0.2% by weight of carbon black, an ethylene-vinyl acetate copolymer of 0.1. 2 to 5% by weight, polyethylene resin 94.8 to 9
A raw material A made of a granular material foamed at 9.75% by weight at a magnification of 1.05 to 1.5 times and a raw material B made of polyethylene resin granular material are prepared. Of 100% by weight of the raw material consisting of 55 to 95% by weight, is formed by an injection-molded product having a foaming ratio of 1.05 to 1.5 obtained by injection-molding a mixture containing a foaming agent. Characteristic synthetic resin bobbin.
４〜０．９７ｇ／ｃｍ3（無発泡状態での密度）でメル
トインデックス２〜１０ｇ／１０分のエチレン単独重合
体又はエチレンと他のαーオレフィンとの共重合体であ
ることを特徴とする請求項１に記載の合成樹脂製ボビ
ン。3. The polyethylene resin as the raw material A has a density of 0.9.
An ethylene homopolymer having a melt index of 4 to 0.97 g / cm 3 (density in a non-foamed state) of 2 to 10 g / 10 min or a copolymer of ethylene and another α-olefin. Item 1. A synthetic resin bobbin according to item 1.
が酢酸ビニル成分が１０〜２５重量％のエチレン−酢酸
ビニル共重合体であることを特徴とする請求項１に記載
の合成樹脂製ボビン。4. The synthetic resin bobbin according to claim 1, wherein the ethylene-vinyl acetate copolymer of the raw material A is an ethylene-vinyl acetate copolymer having a vinyl acetate component of 10 to 25% by weight. .
デックス２〜１０ｇ／１０分のエチレン単独重合体又は
エチレンと他のαーオレフィンとの共重合体であること
を特徴とする請求項１に記載の合成樹脂製ボビン。5. The synthesis according to claim 1, wherein the polyethylene resin as the raw material B is an ethylene homopolymer having a melt index of 2 to 10 g / 10 min or a copolymer of ethylene and another α-olefin. Resin bobbin.
孔を通過する大きさの粒状体であることを特徴とする請
求項１に記載の合成樹脂製ボビン。6. The synthetic resin bobbin according to claim 1, wherein the raw material A and the raw material B are granular bodies having a size that passes through an opening having a diameter of 15 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5131964A JPH06345337A (en) | 1993-06-02 | 1993-06-02 | Synthetic resin-made bobbin |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5131964A JPH06345337A (en) | 1993-06-02 | 1993-06-02 | Synthetic resin-made bobbin |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH06345337A true JPH06345337A (en) | 1994-12-20 |
Family
ID=15070343
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5131964A Pending JPH06345337A (en) | 1993-06-02 | 1993-06-02 | Synthetic resin-made bobbin |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH06345337A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2013193308A (en) * | 2012-03-19 | 2013-09-30 | Showa Marutsutsu Co Ltd | Resin-made core |
-
1993
- 1993-06-02 JP JP5131964A patent/JPH06345337A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2013193308A (en) * | 2012-03-19 | 2013-09-30 | Showa Marutsutsu Co Ltd | Resin-made core |
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