JPH0640668A - Glass fiber strand and coupling of the same - Google Patents
Glass fiber strand and coupling of the sameInfo
- Publication number
- JPH0640668A JPH0640668A JP12295791A JP12295791A JPH0640668A JP H0640668 A JPH0640668 A JP H0640668A JP 12295791 A JP12295791 A JP 12295791A JP 12295791 A JP12295791 A JP 12295791A JP H0640668 A JPH0640668 A JP H0640668A
- Authority
- JP
- Japan
- Prior art keywords
- glass fiber
- fiber bundle
- coupling
- central part
- opened
- 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
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H69/00—Methods of, or devices for, interconnecting successive lengths of material; Knot-tying devices ;Control of the correct working of the interconnecting device
- B65H69/06—Methods of, or devices for, interconnecting successive lengths of material; Knot-tying devices ;Control of the correct working of the interconnecting device by splicing
- B65H69/061—Methods of, or devices for, interconnecting successive lengths of material; Knot-tying devices ;Control of the correct working of the interconnecting device by splicing using pneumatic means
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H2701/00—Handled material; Storage means
- B65H2701/30—Handled filamentary material
- B65H2701/31—Textiles threads or artificial strands of filaments
- B65H2701/312—Fibreglass strands
Landscapes
- Treatment Of Fiber Materials (AREA)
- Yarns And Mechanical Finishing Of Yarns Or Ropes (AREA)
Abstract
Description
【0001】[0001]
【産業上の利用分野】本発明は、ガラス繊維束並びにそ
の連結方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a glass fiber bundle and its connecting method.
【0002】[0002]
【従来の技術】ガラス繊維束は、ブッシングから引出し
たガラス繊維に集束剤を付与して集束し、回転するマン
ドレルに嵌挿させた紙管に巻取ることによって製造さ
れ、加熱乾燥炉(CDO)中で所定時間乾燥した後使用
される。巻取られたガラス繊維束(ストランド)は、ケ
ーキと呼ばれ、ケーキから引出されたストランドは連続
的に次の工程へ送られて使用されることが多い。例え
ば、多数のケーキから夫々ストランドを引出し、これら
のストランドを引揃えてロービングとし、このロービン
グを円筒状に巻取る。この際、一つのケーキAが使用し
盡された後、或はストランドが切断した際、このケーキ
Aのストランドの終端と次のケーキA´との終端とを接
続固定し、ストランドを連続的に供給する。2. Description of the Related Art A glass fiber bundle is manufactured by applying a sizing agent to a glass fiber drawn from a bushing, bundling it, and winding the glass fiber around a paper tube inserted into a rotating mandrel. The heating and drying oven (CDO) It is used after being dried for a predetermined time. The wound glass fiber bundle (strand) is called a cake, and the strand drawn from the cake is often continuously sent to the next step for use. For example, a strand is drawn out from each of a number of cakes, and these strands are aligned to form a roving, and this roving is wound into a cylindrical shape. At this time, after one cake A is used and squeezed, or when the strand is cut, the end of the strand of this cake A and the end of the next cake A ′ are connected and fixed, and the strand is continuously Supply.
【0003】[0003]
【発明が解決しようとする課題】二本のストランドを接
続固定するため、これらを結び合わせ、或は接着剤で接
着することも行われているが、このような方法で得られ
たロービングを使用してFRPを製造すると、これらの
接続部(結合部)がガイドに引掛ったり接続部に相当す
る箇所のFRPにふくれを生じたり、樹脂の含浸不良を
生じたり、或は接続箇所の固定が不充分となり、接続部
が外れたり、接続部の強度が不充分となり易い難点があ
る。上述したケーキA´の先端を、空気流を利用してロ
ービングに巻付ける方法(実開昭60−13935号公
報参照)も提案されているが、この方法によるときは、
A以外のケーキから引出されたストランドで構成されれ
るロービングをケーキA´から引出されたストランドで
巻き締めることにより、ケーキA´から引出されたスト
ランドが固定される。従って、この方法によるときは、
ロービングに巻き付いたストランドがロービング中に点
在することとなり、この部分がほぐれて、このロービン
グを使用して得られたクロスの表面に露出したり、次の
工程でロービングをカッターで切断し、エアーで吹付け
て使用する際、散りが充分でないというような難点が生
ずる。又、二本の撚糸端を重ね合わせ、糸継ぎ装置に送
り、圧力空気の作用により糸端を解繊し、この解繊した
糸の末端を相手方の糸に絡み付かせる方法も提案されて
いる。(特開昭51−19843号公報、特開昭57−
160870号公報参照) この方法は、有機繊維のヤーンには有効な方法ではある
が、この方法をガラス繊維束の結合に使用するとガラス
繊維は硬く、滑り易いため、絡み付いた繊維が破断し易
く、充分な結合強度が得難い難点があり、この傾向はガ
ラス繊維直径が大となる程大きくなり、5μ以上のガラ
ス繊維の場合、充分な結合強度が得難い。本発明は、こ
のような従来技術の難点を解消することを目的としてい
る。In order to connect and fix two strands, it has been attempted to tie them together or to bond them with an adhesive. However, the roving obtained by such a method is used. When the FRP is manufactured by using these, the connection part (coupling part) is caught on the guide, the FRP in the part corresponding to the connection part is bulged, the impregnation of the resin is caused, or the connection part is not fixed. There is a problem in that the connection becomes insufficient and the connection part comes off, and the strength of the connection part tends to be insufficient. A method (see Japanese Utility Model Laid-Open No. 60-13935) of winding the tip of the above-mentioned cake A ′ around the roving by using an air flow has also been proposed.
The strands drawn from the cake A ′ are fixed by winding the roving composed of the strands drawn from the cakes other than A with the strands drawn from the cake A ′. Therefore, when using this method,
Strands wrapped around the roving will be scattered during the roving, and this part will be loosened and exposed on the surface of the cloth obtained using this roving, or the roving will be cut with a cutter in the next step, and When it is sprayed and used, there is a problem that the scattering is not enough. A method has also been proposed in which two twisted yarn ends are overlapped and sent to a yarn splicing device, the yarn ends are defibrated by the action of pressure air, and the ends of the defibrated yarns are entangled with the other yarn. . (JP-A-51-19843, JP-A-57-
Although this method is effective for yarns of organic fibers, when this method is used for binding glass fiber bundles, the glass fibers are hard and slippery, and thus the entangled fibers are easily broken, There is a problem that it is difficult to obtain a sufficient bonding strength, and this tendency becomes larger as the diameter of the glass fiber becomes larger, and it becomes difficult to obtain a sufficient bonding strength when the glass fiber has a diameter of 5 μm or more. SUMMARY OF THE INVENTION The present invention aims to overcome such drawbacks of the prior art.
【0004】[0004]
【課題を解決するための手段】上記目的を達成するため
の本発明においては、二本のガラス繊維束の端部が夫々
ほぼ単繊維に開繊し、この開繊された二つのガラス繊維
束の繊維同志を混り合わせ結合部を形成し、且つこの結
合部の中央部には撚りを与えず、中央部の両側の結合部
には逆方向の撚りが与えた結合部でガラス繊維束を連結
し、又ガラス繊維束挿入用スリットを備えた円形断面を
有する通路に、二本のガラス繊維束を、その各々の末端
が上記通路から突出するような充分長さに亘って重ね合
わせて挿入し、一方のガラス繊維束の末端と他のガラス
繊維束とを固定具で拘束し、該通路にこれと直交する空
気吹込口から圧縮空気を吹込んで上記二本のガラス繊維
束を開繊してその端部を混り合わせて結合する。SUMMARY OF THE INVENTION In the present invention for achieving the above object, the ends of two glass fiber bundles are opened into substantially single fibers, and the two opened glass fiber bundles are opened. Fibers are mixed together to form a joint, and no twist is given to the central part of this joint, and glass fiber bundles are applied to the joints on both sides of the central part by twisting in the opposite direction. Insert two glass fiber bundles into a passage having a circular cross-section that is connected to each other and has a slit for inserting the glass fiber bundles, overlapping each other for a sufficient length such that each end of the glass fiber bundle protrudes from the passage. Then, the end of one glass fiber bundle and the other glass fiber bundle are restrained by a fixture, and compressed air is blown into the passage from an air blowing port orthogonal to this to open the two glass fiber bundles. The ends are mixed together and joined.
【0005】次に、本発明を添付図面に就いて更に具体
的に説明する。ガラス繊維束(ストランド)としては、
太さ5〜20μ、好ましくは9〜13μのガラス繊維に
集束剤を附与し、50〜4,000本、好ましくは10
0〜400本集束したものが好適に使用できる。集束剤
の種類に特に限定はないが、ポリ酢酸ビニル、ポリウレ
タン、エポキシ等の皮膜形成剤を0.02〜9wt%、
好ましくは0.05〜4.5wt%、ビニシラン、アク
リルシラン、ボラン等のカップリング剤を0.001〜
1wt%、好ましくは0.005〜0.5wt%、テト
ラエチレンペンタミンとステアリン酸の縮合物等の潤滑
剤を0.001〜1wt%、好ましくは0.005〜
0.5wt%含むものが適当であり、又集束剤の付与量
は、ガラス繊維に対し、固型分として0.01〜10w
t%、好ましくは0.1〜5wt%とするのが望まし
い。Next, the present invention will be described more specifically with reference to the accompanying drawings. As a glass fiber bundle (strand),
A sizing agent is added to glass fibers having a thickness of 5 to 20 μm, preferably 9 to 13 μm, and 50 to 4,000, preferably 10
A bundle of 0 to 400 bundles can be preferably used. The type of sizing agent is not particularly limited, but 0.02 to 9 wt% of a film forming agent such as polyvinyl acetate, polyurethane, epoxy,
Preferably, 0.05 to 4.5 wt%, 0.001 to 0.001 of a coupling agent such as vinylsilane, acrylic silane, or borane.
1 wt%, preferably 0.005 to 0.5 wt%, 0.001 to 1 wt%, preferably 0.005 to 0.005 wt% of a lubricant such as a condensation product of tetraethylene pentamine and stearic acid
It is suitable to contain 0.5 wt%, and the amount of the sizing agent applied is 0.01 to 10 w as a solid content with respect to the glass fiber.
t%, preferably 0.1 to 5 wt% is desirable.
【0006】図1は本発明の結合部の構造を示す斜視図
である。ガラス繊維束1,2の端部は、ほぼ単繊維状に
開繊され、この開繊された繊維同志が混り合って結合部
3が形成されている。この結合部3の中央部4には撚り
が与えられておらず、中央部の両側の結合部には互いに
逆方向の撚り(図において左側には左撚り、右側には右
撚り)が与えられている。このようなガラス繊維束の結
合部は、図2に示すような、ストランドを挿入するため
のスリット5を有する円形断面を有する円形通路6に、
二本のガラス繊維束1,2をその各々の末端が上記通路
から突出するよう充分な長さに亘って端部を重ね合わせ
て挿入し、一方のガラス繊維束の末端と他のガラス繊維
束とを固定具8で固定し、円形通路6に直角に該通路に
開孔する空気吹込み孔7から、3〜7Kg/cm2 G程
度の圧縮空気を吹込むことによって得ることができる
る。FIG. 1 is a perspective view showing the structure of the coupling portion of the present invention. The ends of the glass fiber bundles 1 and 2 are opened into a substantially single fiber shape, and the opened fibers are mixed to form a joint portion 3. No twist is given to the central portion 4 of the joint portion 3, and twists in opposite directions (left twist on the left side and right twist on the right side in the figure) are given to the joint portions on both sides of the central portion. ing. The connecting portion of such a glass fiber bundle is provided in a circular passage 6 having a circular cross section having a slit 5 for inserting a strand, as shown in FIG.
Two glass fiber bundles 1 and 2 are inserted with their ends overlapped with each other over a sufficient length so that their respective ends project from the passage, and the ends of one glass fiber bundle and the other glass fiber bundle are inserted. Are fixed by a fixture 8 and compressed air of about 3 to 7 kg / cm 2 G is blown into the circular passage 6 through an air blowing hole 7 formed in the passage at right angles.
【0007】なお、この際、円形通路の断面積をガラス
繊維束断面積のほぼ10〜500倍程度とし、又ガラス
繊維束が自由に撚れないようガラス繊維束を通路両端に
設けた固定具8,8を用いて軽く拘束するのが適当であ
る。なお、結合部の長さは0.5〜10cm望ましくは
1〜3cmとするのが適当である。円形通路6に流入し
た圧縮空気は、該通路に沿って流れ、その両端から流出
するが、この空気の流れによりガラス繊維束は、これを
構成するガラス繊維に開繊されてまざり合い、撚りが与
えられる。At this time, the cross-sectional area of the circular passage is set to about 10 to 500 times the cross-sectional area of the glass fiber bundle, and a fixture provided with the glass fiber bundle at both ends of the passage so that the glass fiber bundle is not twisted freely. It is suitable to lightly restrain with 8,8. The length of the joint is 0.5 to 10 cm, preferably 1 to 3 cm. The compressed air that has flowed into the circular passage 6 flows along the passage and flows out from both ends thereof, but due to the flow of this air, the glass fiber bundle is spread into the glass fibers that compose it and twists and twists. Given.
【0008】[0008]
【作用】二本のガラス繊維束の端部が夫々ほぼ単繊維に
開繊し、この開繊された二つのガラス繊維束の繊維同志
を混り合わせた結合部を形成し、この結合部の中央部に
は撚りを与えず、中央部の両側の結合部には逆方向の撚
りを与えられた結合部で、二本のガラス繊維束の端部を
強固に結合し、且つ樹脂の含浸を良好ならしめる。又、
ガラス繊維束挿入用スリットを備えた円形断面を有する
通路に、二本のガラス繊維束を、その各々の末端が上記
通路から突出するような充分な長さに亘って重ね合わせ
て挿入し、一方のガラス繊維束の末端と他のガラス繊維
束とを固定具で拘束し、該通路にこれと直交する空気吹
込口から圧縮空気を吹込んで上記二本のガラス繊維束の
端部を開繊して混り合わせて結合することにより、二本
のガラス繊維束を充分な強度を持って連結し、しかも、
結合部の樹脂の含浸性を良好ならしめる。[Function] The ends of the two glass fiber bundles are respectively opened into almost single fibers, and a joint portion is formed by mixing the fibers of the two opened glass fiber bundles. Twist is not applied to the central part, and the connecting parts on both sides of the central part are twisted in opposite directions to firmly bond the ends of the two glass fiber bundles and to impregnate the resin. If it is good, give it. or,
In a passage having a circular cross section provided with a slit for inserting a glass fiber bundle, two glass fiber bundles are superposed and inserted over a sufficient length such that each end of the glass fiber bundle projects from the passage, The other end of the glass fiber bundle and the other glass fiber bundle are constrained by a fixture, and compressed air is blown into the passage from an air blowing port orthogonal to this to open the ends of the two glass fiber bundles. The two glass fiber bundles are connected with sufficient strength by mixing and combining them, and
Improves resin impregnation at the joint.
【0009】[0009]
【実施例】直径10μのガラス繊維にエポキシ系集束剤
を固型分として0.5wt%附与し、4,000本集束
してガラス繊維束とした。このガラス繊維束の端部を7
cm重ね合わせ、図2,3に示すような通路(長さ5c
m、直径10mm)に各々の末端が通路から突出するよ
うに挿入し、両端を固定具8で軽く押さえて、6Kg/
cm2 Gの圧縮空気を吹き込むことにより、このガラス
繊維束を2本図1に示すような結合部を形成させて連結
した。結合部の諸元は次の通りである。 中央部の長さ 約20mm 中央部の両端の撚りを与えた 部分の長さ 各約10mm 撚りの回数 4回 このガラス繊維束の結合部の引張り強度(10個の平均
値)は1,400gであった。これに対し、ガラス繊維
束を手結びした場合の引張り強度は540gであった。
このガラス繊維束に液状の不飽和ポリエステル樹脂を、
ガラス繊維束に対し200wt%含浸せしめたが、含浸
は均一に行われた。又、このガラス繊維束をスプレーガ
ンに送って切断したが、ガラス繊維束がガイド或はガン
に引掛ることはなかった。これに対し従来の方法で得ら
れたガラス繊維束では15〜25回の引掛りが生じた。Example 0.5 wt% of epoxy type sizing agent as a solid component was added to glass fiber having a diameter of 10 μm, and 4,000 pieces were bundled to form a glass fiber bundle. Set the end of this glass fiber bundle to 7
cm overlap, passage as shown in Figs. 2 and 3 (length 5c
m, diameter 10 mm) so that each end projects from the passage, and lightly press both ends with the fixture 8 to give 6 kg /
By blowing compressed air of cm 2 G, two glass fiber bundles were connected to each other to form a connecting portion as shown in FIG. The specifications of the joint are as follows. The length of the central part is about 20 mm The length of the part where the ends of the central part are twisted is about 10 mm each The number of times of twisting is 4 times The tensile strength (average value of 10 pieces) of this glass fiber bundle is 1,400 g. there were. On the other hand, the tensile strength when the glass fiber bundle was hand-tied was 540 g.
Liquid unsaturated polyester resin to this glass fiber bundle,
The glass fiber bundle was impregnated with 200 wt%, but the impregnation was performed uniformly. The glass fiber bundle was sent to a spray gun and cut, but the glass fiber bundle was not caught by the guide or the gun. On the other hand, in the glass fiber bundle obtained by the conventional method, hooking occurred 15 to 25 times.
【0010】[0010]
【発明の効果】本発明の結合部は、引張り強度も大き
く、樹脂の含浸も均一に行なわれる。本発明のガラス繊
維束は、樹脂の含浸も均一であり、ガラス繊維束をを引
出して使用する際の引掛り等のトラブルもなく、ガラス
繊維束を切断する際の散りも良好である。又、本発明の
ガラス繊維束を使用することにより品質の良好なクロス
を得ることができる。The joint portion of the present invention has a large tensile strength and is uniformly impregnated with resin. The glass fiber bundle of the present invention is uniformly impregnated with resin, has no trouble such as catching when the glass fiber bundle is pulled out and is used, and has good scatter when the glass fiber bundle is cut. Further, by using the glass fiber bundle of the present invention, a cloth of good quality can be obtained.
【0011】[0011]
【図1】本発明に係るガラス繊維束の結合部の斜視図で
ある。FIG. 1 is a perspective view of a connecting portion of a glass fiber bundle according to the present invention.
【図2】本発明の結合部を得るのに使用される方法を説
明するための斜視図である。FIG. 2 is a perspective view for explaining a method used to obtain the coupling part of the present invention.
【図3】図2に示す装置のIII−III断面図であ
る。3 is a sectional view taken along the line III-III of the apparatus shown in FIG.
1 ガラス繊維束 2 ガラス繊維束 3 結合部 4 中央部 5 スリット 6 円形通路 7 空気吹込孔 8 固定具 1 Glass Fiber Bundle 2 Glass Fiber Bundle 3 Joining Part 4 Center Part 5 Slit 6 Circular Passage 7 Air Blow Hole 8 Fixing Tool
Claims (2)
繊維に開繊され、この開繊された二つのガラス繊維束の
繊維同志が混じり合って結合部が形成され、この結合部
の中央部には撚りが与えられておらず、中央部の両側の
結合部には逆方向の撚りが与えられている結合部で連結
されたことを特徴とするガラス繊維束。1. The end portions of the two glass fiber bundles are respectively opened into substantially single fibers, and the fibers of the two opened glass fiber bundles are mixed to form a joint portion, and the joint portion is formed. The glass fiber bundle is characterized in that the central part of the is not twisted, and the connecting parts on both sides of the central part are connected by a connecting part in which the opposite twist is applied.
形断面を有する通路に、二本のガラス繊維束を、その各
々の末端が上記通路から突出するような充分長さに亘っ
て重ね合わせて挿入し、一方のガラス繊維束の末端と他
のガラス繊維束とを固定具で拘束し、該通路にこれと直
交する空気吹込口から圧縮空気を吹込んで上記二本のガ
ラス繊維束を開繊してその端部を混り合わせて結合する
ことを特徴とするガラス繊維束の連結方法。2. A channel having a circular cross section with a slit for inserting a glass fiber bundle, and two glass fiber bundles are overlapped with each other over a sufficient length such that each end of the glass fiber bundle projects from the channel. Insert the glass fiber bundle and the other end of the glass fiber bundle is restrained by a fixture, and compressed air is blown into the passage from an air blowing port orthogonal to this to open the two glass fiber bundles. A method for connecting glass fiber bundles, characterized in that the ends are mixed together and then combined.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP12295791A JPH0640668A (en) | 1991-04-26 | 1991-04-26 | Glass fiber strand and coupling of the same |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP12295791A JPH0640668A (en) | 1991-04-26 | 1991-04-26 | Glass fiber strand and coupling of the same |
Related Parent Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP21370888A Division JPH0268322A (en) | 1988-08-30 | 1988-08-30 | Connecting structure of glass fiber bundle, roving and production of roving |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH0640668A true JPH0640668A (en) | 1994-02-15 |
Family
ID=14848817
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP12295791A Pending JPH0640668A (en) | 1991-04-26 | 1991-04-26 | Glass fiber strand and coupling of the same |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH0640668A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2016222431A (en) * | 2015-06-01 | 2016-12-28 | 日本電気硝子株式会社 | Glass fiber bundle body and manufacturing method of the same |
JP6390822B1 (en) * | 2017-12-11 | 2018-09-19 | 日東紡績株式会社 | Glass fiber thread assembly |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5225139A (en) * | 1975-08-18 | 1977-02-24 | Kanebo Ltd | Method of conveying bobbins of textile machine |
JPS5621709A (en) * | 1979-08-01 | 1981-02-28 | Fuji Seiki Seizosho:Kk | Horizontal multispindle drilling machine with exchangeable cluster plate body |
JPS57102473A (en) * | 1980-12-13 | 1982-06-25 | Murata Mach Ltd | Method of preventing abnormal yarn connection on yarn winder |
-
1991
- 1991-04-26 JP JP12295791A patent/JPH0640668A/en active Pending
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5225139A (en) * | 1975-08-18 | 1977-02-24 | Kanebo Ltd | Method of conveying bobbins of textile machine |
JPS5621709A (en) * | 1979-08-01 | 1981-02-28 | Fuji Seiki Seizosho:Kk | Horizontal multispindle drilling machine with exchangeable cluster plate body |
JPS57102473A (en) * | 1980-12-13 | 1982-06-25 | Murata Mach Ltd | Method of preventing abnormal yarn connection on yarn winder |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2016222431A (en) * | 2015-06-01 | 2016-12-28 | 日本電気硝子株式会社 | Glass fiber bundle body and manufacturing method of the same |
JP6390822B1 (en) * | 2017-12-11 | 2018-09-19 | 日東紡績株式会社 | Glass fiber thread assembly |
WO2019116432A1 (en) * | 2017-12-11 | 2019-06-20 | 日東紡績株式会社 | Glass fiber yarn connected body |
KR20190086030A (en) * | 2017-12-11 | 2019-07-19 | 니토 보세키 가부시기가이샤 | Glass fiber yarn connector |
US10900146B2 (en) | 2017-12-11 | 2021-01-26 | Nitto Boseki Co., Ltd. | Glass-fiber-yarn connected body |
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